ELECTRICITY FEEDING DEVICE AND ELECTRICITY FEEDING

SYSTEM USING THE SAME TECHNICAL FIELD

[0001] The invention relates generally to an electricity feeding device and an electricity feeding system using the same.

BACKGROUND ART

[0002] In the past, there have been proposed a battery charger for an electrical automobile (for instance, see Japanese Patent Application Laid- Open No. 8-33121). This battery charger is configured to use an AC power of a commercial AC power source fed to each of residential houses as a power for charging. An AC / DC converter, converting the commercial AC power source to a DC power source, is located in the electrical automobile's side. When a connector of a charging cable located in the battery charger's side is connected to a connector of the electrical automobile's side, the commercial AC power source is fed to the electrical automobile. Thus, the fed commer ^¬ cial AC power source is converted to the DC power source by the AC / DC converter, and then a battery of the electrical automobile is charged.

[0003] However, the battery charger, described in the above document, receives a supply of residential commercial AC power source, and then the AC / DC converter converts the supplied commercial AC power source to a DC voltage, for the battery of the electrical automobile, and then the battery is charged. As a result, a conversion loss is generated in the electrical automobile's side, upon the AC / DC conversion. In addition, although charging currents may be different depending on types of electrical automobiles, the battery charger can not correspond to the difference of the charging currents.

DISCLOSURE OF THE INVENTION

[0004] It is an object of the present invention to provide an electricity feeding device, which can prevent a power conversion loss in an equipment's side, and an electricity feeding system using the same.

[0005] An electricity feeding device of the present invention comprises a feeding-connector connected to an equipment having a battery, and receives a DC power supply and feeding a desired DC power to the equipment. Further, the electricity feeding device comprises a feeding information acquisition section, a control section, and a DC / DC converter. The feeding information acquisition section acquires feeding information relevant to a feeding voltage and a feeding current for charging the battery, from the equipment. The control section is configured to set the feeding voltage and the feeding current fed to the equipment based on the feeding information acquired by the feeding information acquisition section. The DC / DC converter feeds the feeding voltage and the feeding current set by the control section to the equipment.

[0006] In this configuration, the electricity feeding device, using a DC power source fed to electric devices in a residential house as a charging power source, can be realized. Then, there is no need to locate the conventional AC / DC converter, in the equipment's side. Therefore, the electricity feeding device can prevent a power conversion loss in the equipment's side, compared with the above conventional example. In addition, since the electricity feeding device acquires the feeding information from the equipment, the electricity feeding device can feed a DC power corresponding to a connected equipment.

[0007] In an embodiment, the equipment comprises a charge circuit charging the battery at a charging current corresponding to a charge enabling signal. The control section of the electricity feeding device is configured to output the charge enabling signal to the equipment to control the charging current of the charge circuit.

[0008] In this configuration, the electricity feeding device can control the charging current of a connected equipment by the charge enabling signal, and thereby can prevent a power blackout due to overcurrent.

[0009] An electricity feeding system of the present invention comprises the electricity feeding device, a DC power source section feeding a DC power to the electricity feeding device, and a transmitter transmitting feeding capacity information of the DC power source section to the electricity feeding device. The control section of the electricity feeding device is configured to set the feeding voltage and the feeding current fed to the equipment, based on the feeding information acquired by the feeding information acquisition section and the feeding capacity information of the DC power source section transmitted from the transmitter. The DC / DC converter feeds the feeding voltage and the feeding current set by the control section to the equipment.

[0010] In this configuration, the control section sets an electric power fed to the equipment, based on the feeding information transmitted from the equipment's side and the feeding capacity information of the DC power source section transmitted from the transmitter, and thus the electric power fed to the equipment never exceeds a feeding capacity of the DC power source section. Further, the electricity feeding system can feed the electric power, which is more close to an electric power needed by the equipment, to the equipment.

[0011] In an embodiment, the electricity feeding system further comprises an AC power source section feeding an AC power to the electricity feeding device. The electricity feeding device is provided with an AC / DC converter. The AC / DC converter converts the AC power fed by the AC power source section to a DC power of the feeding voltage and the feeding current set by the control section, and feeds the DC power to the equipment.

[0012] In this configuration, the electricity feeding device is provided with the AC / DC converter, and thereby the AC power fed by the AC power source section can be directly converted to the DC power. Therefore, the electricity feeding system can decrease a conversion efficiency loss. Further, the electricity feeding device comprises the AC / DC converter and the DC / DC converter, and thus convenient electricity feeding system can be provided.

[0013] In an embodiment, the electricity feeding system further comprises an AC power source section feeding an AC power to the electricity feeding device. The electricity feeding device is provided with a switching section switching to either an output of the AC power source section or an output of the DC / DC converter. The feeding information acquisition section acquires a selection signal for selecting either the output of the AC power source section or the output of the DC / DC converter, from the equipment. The control section is configured to control switching of the switching section based on the selection signal and to feed an electric power to the equipment through a feeding line when receiving the selection signal from the feeding information acquisition section.

[0014] In this configuration, the AC power, outputted from the AC power source section, or the DC power, outputted from the DC / DC converter, can be selected as an electric power fed to the equipment through a feeding line due to switching of the switching section. Therefore, convenient electricity feeding system can be provided.

[0015] An electricity feeding system of the present invention comprises the electricity feeding device, a DC power source section feeding a DC power to the electricity feeding device, a control device configured to control a power feeding of the DC power source section. Further, the electricity feeding system comprises a solar power generation device, as a power source, feeding a DC power to the DC power source section, a storage battery storing a surplus electric power generated by the solar power generation device, and an AC / DC converter. The control device is configured to determine power feeding ratios of the solar power generation device, the storage battery, and the AC / DC converter, based on the feeding information transmitted from the electricity feeding device, an electric generation state of the solar power generation device, a remaining amount of the storage battery, and a power feeding state of the AC / DC converter, respectively.

[0016] In this configuration, the control device determines power feeding ratios of the solar power generation device, the storage battery, and the AC / DC converter, based on the feeding information transmitted from the equipment, the electric generation state of the solar power generation device, the remaining amount of the storage battery, and the power feeding state of the AC / DC converter, respectively. Thus, the electricity feeding system can feed a DC power available for feeding then to the equipment.

BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Preferred embodiments of the invention will now be described in further details. Other features and advantages of the present invention will become better understood with regard to the following detailed description and accompanying drawings where '

Fig. 1A is a view showing a frame format of an electricity feeding system according to an embodiment 1 of the present invention;

Fig. IB is a detail view showing an essential part of said electricity feeding system according to said embodiment l;

Fig. 2A is a view showing a frame format of an electricity feeding system according to an embodiment 2 of the present invention,"

Fig. 2B is a detail view showing an essential part of said electricity feeding system according to said embodiment 2;

Fig. 3A is a view showing a frame format of an electricity feeding system according to an embodiment 3 of the present invention;

Fig. 3B is a detail view showing an essential part of said electricity feeding system according to said embodiment 3;

Fig. 4 is a view showing a frame format of an electricity feeding system according to an embodiment 4 of the present invention; and

Fig. 5 is an illustration diagram for illustrating a charging state of said electricity feeding system according to said embodiment 4.

BEST MODE FOR CARRYING OUT THE INVENTION

[0018] Each embodiment of an electricity feeding device and an electricity feeding system according to the present invention is explained below with reference to figures. The electricity feeding device according to the present invention uses a DC distribution system which distributes a DC power to electric devices in a residential house (that is, devices driven by a DC power). The electricity feeding device uses the DC power distributed from the DC distribution system, as a charging power source, and then feeds a desired DC power to electrical automobiles, such as a battery car and a plug-in hybrid car. Then, the electricity feeding system according to the present invention comprises the electricity feeding device, and the above-mentioned DC distribution system which comprises a DC power distribution board, an AC power distribution board, and a control device described below.

[0019] (Embodiment l)

Fig. 1A is a view showing a frame format of an electricity feeding system according to an embodiment 1. The electricity feeding system comprises an electricity feeding device 1 located so as to be adjacent to a residential house H, a DC power distribution board (a DC power source section) 2 located within the residential house H and feeding a DC power to the electricity feeding device 1, a control device 3 controlling a power feeding of the DC power distribution board 2, and a control panel 4.

[0020] The electricity feeding device 1, as shown in Fig. 1A, comprises a signal communication circuit 12, a power source control circuit 11, a DC / DC converter 13, an interface circuit 14, and a feeding-connector 15. The signal communication circuit 12 is configured to communicate signals with an electrical automobile (an equipment) C. The power source control circuit 11 is configured to set an electric power fed to the electrical automobile C, based on information included in a signal acquired by the signal communication circuit 12. The DC / DC converter 13 feeds the electric power set by the power source control circuit 11 to the electrical automobile C. The interface circuit 14 is set between the control device 3 and the signal communication circuit 12, and mediates their communication of information. The feeding- connector 15 is attached in a cable derived from the electricity feeding device 1, and is connected to a car-side-connector 85 of the electrical automobile C. In the present embodiment, a value of a DC voltage, explained below, out- putted from the DC / DC converter 13, is set at DC 300 [V].

[0021] The DC power distribution board 2, as shown in Fig. 1A, a DC / DC converter 21, a DC / DC converter 22, a AC / DC converter 23, a cooperation control section 24, and a plurality of DC circuit breakers 25 (six DC circuit breakers 25 are shown in Fig. lA). The DC / DC converter 21 converts a DC power fed by a storage battery 7 to a predetermined DC power (for instance, DC 350 [V]). The DC / DC converter 22 converts a DC power fed by a solar power generation device 6 to a predetermined DC power (for instance, DC 350 [V]). The AC / DC converter 23 converts an AC power fed by a commercial AC power source 100 to a predetermined DC power (for instance, DC 350 [V]). The cooperation control section 24 cooperates each output of the converters 21 to 23 and feeds to loads. A DC power fed from each of the converters 21 to 23 is fed to the electricity feeding device 1 via the coope- ration control section 24 and one of the DC circuit breakers 25.

[0022] The control device 3 is configured to control a DC power energy outputted from the DC power d stribution board 2, and to determine power feeding ratios of the above-mentioned DC / DC converters 21, 22 and AC / DC converter 23, respectively. The control device 3 has a function to transmit feeding capacity information of the DC power distribution board 2 to the electricity feeding device 1. Then, the electricity feeding device 1 controls the DC / DC converter 13 so that a DC power does not exceed the feeding capacity of the DC power distribution board 2, and feeds the DC power to the electrical automobile C. In the present embodiment, the control device 3 corresponds to a transmitter.

[0023] The control panel 4 comprises, for instance, a touch panel. A power feeding state of the DC power distribution board 2 can be confirmed on a screen. Further, various modes can be determined by operating the touch panel.

[0024] The electrical automobile C, being subject to a power feeding, comprises the car-side-connector 85 to which the feeding-connector 15 of the electricity feeding device 1 is connected, a signal communication circuit 82, a battery 84, a charge circuit 83 for charging the battery 84, and a charge control circuit 81, as shown in Figs. 1A and IB. The signal communication circuit 82 is configured to communicate information (for instance, as described below, feeding information relevant to a feeding voltage and a feeding current for charging the battery 84) with the signal communication circuit 12 of the electricity feeding device 1. The battery 84 stores a DC power (in the present embodiment, DC 300 [V]) fed by the electricity feeding device 1. The charge control circuit 81 controls the charge circuit 83 based on said information inputted from the signal communication circuit 82.

[0025] In the electricity feeding system of the present embodiment, the feeding information, relevant to the feeding voltage and the feeding current for charging the battery 84, is transmitted from the electrical automobile C's side, and then the signal communication circuit 12 acquires the feeding information in the electricity feeding device l's side. Further, in the electricity feeding device 1, the feeding information acquired by the signal communication circuit 12 is inputted to the power source control circuit 11, and then the power source control circuit 11 compares the feeding information with the feeding capacity information of the DC power distribution board 2 transmitted from the control device 3, and sets the feeding voltage and the feeding current fed to the electrical automobile C. The power source control circuit 11 controls the DC / DC converter 13 based on the set feeding voltage and the set feeding current to feed a desired DC power to the electrical automobile C. For instance, if the electricity feeding device 1 is demanded DC 300 [V] and 20 [A] from the electrical automobile C's side and the feeding capacity of the DC power distribution board 2 is 3000 [VA], the electricity feeding device 1 feeds DC 300 [V] and 10 [A] to the electrical automobile C. In the present embodiment, the signal commu ^¬ nication circuit 12 corresponds to a feeding information acquisition section and the power source control circuit 11 corresponds to a control section.

[0026] Furthermore, the electricity feeding system of the present embodi ^¬ ment confirms with SAE (Society of Automotive Engineers) (registered mark) standard, and the power source control circuit 11 of the electricity feeding device 1 outputs a SAE signal (a charge enabling signal) to the charge control circuit 81 of the electrical automobile C. The SAE signal is a signal for limiting a charging current upon charging the battery 84. Then, the charge circuit 83 of the electrical automobile C limits the charging current to a current value determined by on-duty of the SAE signal.

[0027] Next, an operation of the electricity feeding system is explained below. When the feeding- connector 15 of the electricity feeding device 1 is connected to the car- side -connector 85 of the electrical automobile C, the feeding information is transmitted from the electrical automobile C to the electricity feeding device 1, and further the feeding capacity information of the DC power distribution board 2 is transmitted from the control device 3 to the electricity feeding device 1. The electricity feeding device 1 receives the feeding information and the feeding capacity information of the DC power distribution board 2, and the feeding information is compared with the feeding capacity information in the power source control circuit 11. Then, a feeding DC power (a feeding voltage and a feeding current) is determined so as to stay within a range of the feeding capacity of the DC power distribution board 2. Then, the power source control circuit 11 controls the DC / DC converter 13 to feed the determined DC power of the feeding voltage and the feeding current, to the electrical automobile C. Then, the power source control circuit 11 also transmits the above SAE signal to the electrical automobile C.

[0028] On the other hand, in the electrical automobile C, the above DC power is fed and the SAE signal is transmitted, and then the charge control circuit 81 controls the charge circuit 83 to charge the battery 84 at the charging current, which is less than or equal to the current value determined by on-duty of the SAE signal. Then, when the charge is completed, the system informs a user, for instance by displaying the charging completion on a screen of the control panel 4. Then, when the user knows the charging completion on the screen and removes the feeding-connector 15 from the car-side-connector 85, a series of feeding operation is finished.

[0029] As explained above, in the present embodiment, the electricity feeding device 1, which uses the DC power source distributed within the residential house H as the charging power source, can be realized. Then, there is no need to locate the conventional AC / DC converter, in the electrical automobile C's side. Therefore, the electricity feeding device 1 can prevent a power conversion loss in the electrical automobile C's side, compared with the above conventional example. In addition, since the feeding information of the equipment (in present embodiment, the electrical automobile C) is transmitted to the electricity feeding device 1, the electricity feeding device 1 can also feed a DC power corresponding to a connected equipment.

[0030] Further, in the present embodiment, the electricity feeding device 1 can set to the charging current correspond ng to the connected equipment (in present embodiment, the electrical automobile C), due to the SAE signal (the charge enabling signal) transmitted from the electricity feeding device 1. In the equipment's side, the charging current is limited to the set current value. Therefore, the electricity feeding device 1 can prevent a power blackout due to overcurrent.

[0031] In addition, the electricity feeding system sets the feeding power fed to the electrical automobile C, based on the feeding information transmitted from the electrical automobile C's side and the feeding capacity information of the DC power distribution board 2 transmitted from the control device 3. Therefore, the DC power never exceeds the feeding capacity of the DC power distribution board 2. Further, the electricity feeding system can feed the DC power, which is more close to an electric power needed by the electrical automobile C.

[0032] (Embodiment 2)

An electricity feeding device and an electricity feeding system according to an embodiment 2 is explained below with reference to Figs. 2A and 2B. The present embodiment 2 is different from the embodiment 1 in that the electricity feeding device 1 is provided with an AC / DC converter 16 converting an AC power fed by an AC power distribution board 5 to a predetermined DC power. Other features and functions are identical to those of the embodiment 1. Thus, the identical composition element are putted the identical numerals on, and the explanation thereof is omitted.

[0033] The electricity feeding system of the present embodiment comprises the electricity feeding device 1, the DC power distribution board 2, the control device 3, the control panel 4, and an AC power distribution board (an AC power source section) 5 located within the residential house H and feeding an AC power to the electricity feeding device 1.

[0034] As shown in Fig. 2A, the electricity feeding device 1 comprises the power source control circuit 11, the signal communication circuit 12, the DC / DC converter 13, the interface circuit 14, the feeding-connector 15, an AC / DC converter 16, and a switch (a switching section) 17. The AC / DC converter 16 converts an AC power fed by the AC power distribution board 5 to a DC power set by the power source control circuit 11, and feeds the DC power to the electrical automobile C. The switch 17 switches an electrical power fed to the electrical automobile C through a feeding line LI, to either an output of the DC / DC converter 13 or an output of the AC / DC converter 16. For instance, the power source control circuit 11 causes the switch 17 to switch to either the DC / DC converter 13 or the AC / DC converter 16 according to a content instructed by a user via the control panel 4.

[0035] As shown in Fig. 2A, the AC power distribution board 5 comprises a main breaker 51, and a plurality of branch breakers 52 (ten branch breakers are shown in Fig. 2A). An AC power is fed to the AC / DC converter 16 of the electricity feeding device 1 through the main breaker 51 and the branch breakers 52. Also, in the present embodiment, the feeding capacity information of the DC and AC power distribution boards 2, 5 are trans ^¬ mitted from the control device 3 to the electricity feeding device 1.

[0036] Here, in the above-mentioned embodiment 1, the AC / DC converter 23 is located in the DC power distribution board 2, and an DC power converted by the AC / DC converter 23 is fed to the electricity feeding device 1. Then, the DC power fed via the AC / DC converter 23 is further converted by the DC / DC converter 13 of the electricity feeding device 1, and thereby a conversion efficiency decreases. So in the present embodiment the electr ^¬ icity feeding device 1 is provided with the AC / DC converter 16, and the electricity feeding system is configured so that the AC power can be directly converted to the DC power in the electricity feeding device 1, in order to prevent the conversion efficiency loss.

[0037] Then, an operation of the electricity feeding system is explained below. At first, a user instructs to select either the DC / DC converter 13 or the AC / DC converter 16 via the control panel 4. Then, the power source control circuit 11 causes the switch 17 to switch to one of the converters 13, 16 according to the instruction content. Then, when the feeding-connector 15 of the electricity feeding device 1 is connected to the car-side-connector 85 of the electrical automobile C, the feeding information is transmitted from the electrical automobile C to the electricity feeding device 1. Further, the feeding capacity information of the DC power distribution board 2 (or the AC power distribution board 5) is transmitted from the control device 3 to the electricity feeding device 1. When the electricity feeding device 1 receives the feeding information and the feeding capacity information of the DC power distribution board 2 (or the AC power distribution board 5), the feeding information is compared with the feeding capacity information in the power source control circuit 11 of the electricity feeding device 1. Then, a feeding DC power (a feeding voltage and a feeding current) is determined so as to stay within a range of the feeding capacity of the DC power distribution board 2 (or the AC power distribution board 5). Then, the power source control circuit 11 controls the DC / DC converter 13 (or the AC / DC converter 16) to feed the determined DC power of the feeding voltage and the feeding current to the electrical automobile C. Then, the power source control circuit 11 also transmits the above SAE signal to the electrical automobile C.

[0038] On the other hand, in the electrical automobile C, the DC power is fed, and the SAE signal is transmitted, and the charge control circuit 81 controls the charge circuit 83 to charge the battery 84 at a charging current, which is less than or equal to a current value determined by on-duty of the SAE signal. When the charge is completed, the system informs a user, for instance by displaying the charging completion on a screen of the control panel 4. Then, when the user knows the charging completion on the screen and removes the feeding-connector 15 from the car-side-connector 85, a series of feeding operation is finished.

[0039] As explained above, in the present embodiment, the electricity feeding device 1 is provided with the AC / DC converter 16, and a AC power fed by the AC power distribution board 5 can be directly converted to a DC power. Therefore, the system can prevent the conversion efficiency loss. In addition, since the system comprises the AC / DC converter 16 and the DC / DC converter 13, convenient electricity feeding system can be provided.

[0040] (Embodiment s)

An electricity feeding device and an electricity feeding system according to an embodiment 3 is explained below with reference to Figs. 3A and 3B. In the embodiments 1 and 2, the electricity feeding device and the electricity feeding system, which feed only a DC power as a feeding power to electrical automobile C, were explained above. In contrast, the electricity feeding device and the electricity feeding system of the present embodiment is configured so as to switch to either a DC power or an AC power according to connected electrical automobiles Cl to C3. Other features and functions are identical to those of the embodiment 2. Thus, the identical composition element are putted the identical numerals on, and the explanation thereof is omitted.

[0041] The electricity feeding system of the present embodiment comprises the electricity feeding device 1, the DC power distribution board 2, the control device 3, the control panel 4, and the AC power distribution board 5.

[0042] The electricity feeding device 1 comprises the power source control circuit 11, the signal communication circuit 12, the DC / DC converter 13, the interface circuit 14, the feeding-connector 15, and the switch (a switching section) 17. Here, the switch 17 switches an electrical power fed to the electrical automobiles Cl to C3 through the feeding line LI, to either an output of the DC / DC converter 13 or an output of the AC power distribution board 5. Here, the power source control circuit 11 causes the switch 17 to switch according to feeding voltages (AC voltages or DC voltages) transmitted from the electrical automobiles Cl to C3. For instance, a selection signal, having information that the feeding voltage is DC, is included in the feeding information transmitted from the electrical automobile Cl which is compatible with DC charge, and the electrical automobile C3 which is compatible with AC / DC charge. Therefore, the switch 17 is switched to the DC / DC converter 13's side. The selection signal, having information that the feeding voltage is AC, is included in the feeding information transmitted from the electrical automobile C2 which is compatible with AC charge. Therefore, the switch 17 is switched to the AC power distribution board 5's side.

[0043] Then, an operation of the electricity feeding system is explained below. In the following explanation, the system is described to take the DC charge electrical automobile Cl as an example. When the feeding connector 15 of the electricity feeding device 1 is connected to the car-side-connector 85 of the electrical automobile Cl, the feeding information (the feeding voltage and the feeding current) is transmitted from the electrical automobile Cl to the electricity feeding device 1, and further the feeding capacity information of the DC power distribution board 2 is transmitted from the control device 3 to the electricity feeding device 1. When the electricity feeding device 1 receives the feeding information and the feeding capacity information of the DC power distribution board 2, the feeding information is compared with the feeding capacity information in the power source control circuit 11 of the electricity feeding device 1. Then, a feeding DC power (a feeding voltage and a feeding current) is determined so as to stay within a range of the feeding capacity of the DC power distribution board 2. Then, the power source control circuit 11 causes the switch 17 to switch to the DC / DC converter 13's side, and controls the DC / DC converter 13 to feed the determined DC power of the feeding voltage and the feeding current to the electrical automobile CI. Then, the power source control circuit 11 also transmits the above SAE signal to the electrical automobile Cl.

[0044] On the other hand, in the electrical automobile Cl, the DC power is fed, and the SAE signal is transmitted, and the charge control circuit 81 controls the charge circuit 83 to charge the battery 84 at a charging current, which is less than or equal to a current value determined by on-duty of the SAE signal. When the charge is completed, the system informs a user, for instance by displaying the charging completion on a screen of the control panel 4. Then, when the user knows the charging completion on the screen and removes the feeding-connector 15 from the car-side-connector 85, a series of feeding operation is finished.

[0045] If the electrical automobile is the AC charge electrical automobile C2, the switch 17 is switched to the AC power distribution board 5's side, and an AC power is fed to the electrical automobile C2. Then, the AC power is converted to a predetermined DC power by an AC / DC converter (not shown) which is located in the electrical automobile C2, and the charge circuit 83 charges the battery 84 at the DC power.

[0046] If the electrical automobile is the AC / DC charge electrical automobile C3, an electrical power fed by the electricity feeding device 1 may be outputted from the AC power distribution board 5 or the DC / DC converter 13. However, considering the conversion loss associated with the number of conversion, it is more preferred that a DC power is fed by the DC / DC converter 13. In this case, the operation of the electrical automobile C3 is the same as that of the electrical automobile CI.

[0047] As explained above, in the present embodiment, the AC power outputted from the AC power distribution board 5, or the DC power output- tted from the DC / DC converter 13 can be selected as an electric power fed to the electrical automobiles CI to C3 through the feeding line LI due to switching of the switch 17. Therefore, convenient electricity feeding system can be provided.

[0048] (Embodiment 4)

An electricity feeding device and an electricity feeding system according to an embodiment 4 is explained below with reference to Figs. 4 and 5. In the present embodiment, the control device 3 is configured to determine power feeding ratios of the storage battery 7, a solar power generation device 6, and the AC / DC converter 23, based on the feeding information (the feeding voltage and the feeding current) of the electrical automobile C transmitted from the electricity feeding device 1, a remaining amount of the storage battery 7, an electric generation state of the solar power generation device 6, and a power feed ng state of the AC / DC converter 23, respectively. Then, DC powers, corresponding to the determi ^¬ ned power feeding ratios, are fed to the electricity feeding device 1, respectively. Other features and functions are identical to those of the embodiments 1 to 3. Thus, the identical composition element are putted the identical numerals on, and the explanation thereof is omitted.

[0049] The electricity feeding system of the present embodiment comprises the electricity feeding device 1, the DC power distribution board 2, the control device 3, the control panel 4, and the AC power distribution board 5.

[0050] The feeding information of the electrical automobile C is transmitted from the electricity feeding device 1 to the control device 3 via the interface circuit 14. Further, the remaining amount of the storage battery 7, the electric generation state of the solar power generation device 6, and the power feeding state of the AC / DC converter 23 are inputted to the control device 3. The control device 3 determines power feeding ratios of the storage battery 7, the solar power generation device 6, and the AC / DC converter 23, based on their information, respectively. Then, DC powers, corresponding to the determined power feeding ratios, are fed from the DC / DC converters 21, 22 and the AC / DC converter 23 to the electricity feeding device 1, respectively.

[0051] Fig. 5 shows a feeding example from the DC power distribution board 2 to the electricity feeding device 1. The electricity feeding system is explained below, for example, when the electricity feeding device 1 is demanded a feeding voltage DC 300 [V] and a feeding current 20 [A] from the electrical automobile C's side. Then, a bar (a) in Fig. 5 shows a case where an electric power fed from the AC / DC converter 23 is set to zero. In this case, an electric power available for feeding to the electrical automobile C totals 3000 [VA] when an electric power fed from the solar power generation device 6 is set to 2000 [VA] and an electric power fed from the storage battery 7 is set to 1000 [VA]. Therefore, the electricity feeding device 1 can feed a DC power of 300 [V] and 10 [A] to the electrical automobile C.

[0052] Then, a bar (b) in Fig. 5 shows a case where electric powers fed from the AC / DC converter 23 and the solar power generation device 6 are set to zero, respectively. In this case, the electricity feeding device 1 can feed a DC power of 300 [V] and 3.3 [A] to the electrical automobile C when an electric power fed from the storage battery 7 is set to 1000 [VA]. Then, as shown a bar (c) in Fig. 5, an electric power available for feeding to the electrical automobile C totals 4000 [VA], when electric powers fed from the AC / DC converter 23 and the storage battery 7 are set to 1000 [VA], respectively, and an electric power fed from the solar power generation device 6 is set to 2000 [VA]. Therefore, the electricity feeding device 1 can feed a DC power of 300 [V] and 13.3 [A] to the electrical automobile C. Then, as shown a bar (d) in Fig. 5, the electricity feeding device 1 can feed a DC power of 300 [V] and 3.3 [A] to the electrical automobile C when electric powers fed from the solar power generation device 6 and the storage battery 7 are set to zero, respectively, and an electric power fed from the AC / DC converter 23 is set to 1000 [VA].

[0053] An operation of the electricity feeding system is the same as that of the above-mentioned embodiments 1 to 3, and thus the explanation thereof is omitted.

[0054] As explained above, the electricity feeding system of the present embodiment determines power feeding ratios of the solar power generation device 6, the storage battery 7, and the AC / DC converter 23, based on the feeding information transmitted from the electrical automobile C, the electric generation state of the solar power generation device 6, the remaining amount of the storage battery 7, and the power feeding state of the AC / DC converter 23, respectively. Therefore, the electricity feeding system can feed a DC power available for feeding then to the electrical automobile C.

[0055] In the above-mentioned embodiments 1 to 4, a case where the equipment is the electrical automobile C was explained. However, the equipment is not limited to the electrical automobile C, and then the equipment may be something else as long as the equipment has a battery. Further, in the embodiments 1 to 4, the electricity feeding device 1 communicates with the electrical automobile C through a signal line L2. However, a communication configuration of the electricity feeding system is not limited to that of the embodiments 1 to 4. For instance, a signal, which is communicated between the electricity feeding device 1 and the electrical automobile C, may be superposed on the feeding line LI for feeding the DC power, instead of using the signal line L2. Also, a wireless communication may be used.

[0056] Although the present invention has been described with reference to certain preferred embodiments, numerous modifications and variations can be made by those skilled in the art without departing from the true spirit and scope of this invention, namely claims.