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Title:
DC POWER SUPPLY SYSTEM AND DEVICES FOR ELECTRIC MUSICAL EQUIPMENT
Document Type and Number:
WIPO Patent Application WO/2019/196995
Kind Code:
A1
Abstract:
The present invention relates to a DC power connector configured for connection to the power supply input terminal on a musical instruments device, such as an effect pedal for an electric guitar, where the DC power connector contains an electronic circuit comprising means (6) configured to provide galvanic isolation between an input terminal (7; 29, 30; 34, 35; 39) or a cable (25) and an output terminal (3, 5; 24, 27, 32, 37) of the DC power connector. In an embodiment of the invention, the galvanic isolation is provided by a switch-mode converter circuit comprising a transformer. In another embodiment of the invention, the DC power connector is configured such that it enables a user from the DC power connector to choose the DC output voltage from the DC power connector, such that the output voltage corresponds to the DC voltage required for the musical instrument device. The DC power connector of the invention may further comprise a light indicator, such as a LED, the indicates the status of the converter. In a still further embodiment of the invention, the DC connector comprises an IDC connector (7, 39, 47, 53) configured to be connected to a DC supply cable (40) supplying DC power from a DC power supply (49, 55). The invention further relates to a daisy-chain type DC power supply system in which the DC power connector according to the invention is used.

Inventors:
CIOK, Poul (Stefana Botorego 25/6, 43-200 Psxcxyna, PL)
Application Number:
DK2019/000122
Publication Date:
October 17, 2019
Filing Date:
April 05, 2019
Export Citation:
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Assignee:
CIOKS ApS (Hastrupvej 17C, 4600Køge, DK)
International Classes:
H05K5/00; G10H1/32; H01R13/66
Foreign References:
GB2453557A2009-04-15
US8210868B12012-07-03
US20100171475A12010-07-08
Other References:
None
Attorney, Agent or Firm:
WEINRICH, Søren Gert (SGW Patent IVS, Hybenhaven 7, 3060 Espergærde, DK)
Download PDF:
Claims:
CLAIMS

1 . A DC power connector configured for connection to the power supply input terminal on a musical instruments device, such as an effect pedal for an electric guitar, where the DC power connector contains an electronic circuit comprising means (6) configured to provide galvanic isolation between an input terminal (7; 29, 30; 34, 35; 39) or a cable (25) and an output terminal (3, 5; 24, 27, 32, 37) of the DC power connector.

2. A DC power connector according to claim 1 , where said galvanic isolation is provided by a switch-mode converter circuit comprising a transformer.

3. A DC power connector according to claim 1 or 2, where the DC power connector is configured such that it enables a user from the DC power connector to choose the DC output voltage from the DC power connector, such that the output voltage corresponds to the DC voltage required for the musical instrument device.

4. A DC power connector according to claim 2 or 3, where the DC power connector comprises a light indicator, such as a LED, that indicates the status of the converter

5. A DC power connector according to any of the preceding claims, where the DC connector comprises an IDC connector (7, 39, 47, 53) configured to be connected to a DC supply cable (40) supplying DC power from a DC power supply (49, 55).

6. A DC power connector according to claim 5, where the DC power connector (51 ) is in electrical connection via a cable (56, 57, 58) to a respective IDC connector (52, 52’, 52”), such that DC power can be supplied from a DC power supply (55) via a DC power supply cable (54) connected to the DC power supply (55) by connecting the respective IDC connector (52, 52’, 52”) to the DC power supply cable (54).

7. A DC power connector according to claim 5 or 6, where said DC output voltage from the DC power supply (49, 55) is chosen by configuring the respective IDC (7, 39, 47, 53) to establish electrical contact with the appropriate wires or cores (41 , 42, 43, 44), such that the required DC output voltage is present between at least two of these wires or cores.

8. A DC power connector according to claim any of the preceding claims, where said electronic circuit is provided with voltage choosing means configured to choose between different DC output voltages provided on said output terminal (3, 5; 24, 27, 32, 37) of the DC power connector.

9. A DC power connector according to claim 5, where said voltage choosing means is a switch mode converter.

10. A daisy-chain DC power supply system comprising a DC power supply cable (48, 54) connected to a DC power supply (49, 55) and at least one DC connector according to any of the preceding claims 2 to 7, such that the at least one DC power connector can be electrically connected to the DC power supply cable (48, 54) at those positions along the cable, where this connection is desired in a specific application.

1 1. A daisy-chain DC power supply system according to claim 10, where said DC power cable (48, 54) comprises a wire or core at ground potential and a plurality of wires or cores at different electrical potentials relative to ground, where the configuration of the DC power cable (48, 54) is such that the ground wire or core, and at least one of said plurality of wires or cores at different electrical potential relative to ground can be electrically connected to said DC power connector via said IDC connector (7, 39, 47, 53), whereby individual of said DC power connectors can be provided with DC power at different voltages relative to ground. 12. A daisy-chain DC power supply system according to claim 1 1 , where said DC power cable

(48, 54) is a ribbon cable.

13. A daisy-chain DC power supply system according to claim 8 comprising a plurality of DC connectors according to any od the preceding claims 1 to 4, where adjacent connectors (46) are electrically connected via a fixed cable connection (48), such that each connector is provided at a fixed position along the daisy-chain system.

Description:
DC POWER SUPPLY SYSTEM AND DEVICES FOR ELECTRIC MUSICAL EQUIPMENT

TECHNICAL FIELD

The present invention relates generally to the field of low voltage DC power supplies and more particularly to devices, and systems and for providing low voltage DC power to electrical musical equipment, such as effect pedals for electrical guitars.

BACKGROUND OF THE INVENTION

Currently, electrical musical equipment, such as guitar effect pedals, can be powered in different ways, such as: (1 ) a battery inside each piece of equipment; (2) a plug-in mains adapter for each piece of equipment; (3) a plug-in mains adapter with a traditional daisy-chain cable; or (4) a dedicated multi-outlet power supply.

All of these different ways of powering an electrical musical equipment suffer from different drawbacks. Thus, option (1 ) is an expensive and impractical way of powering electrical musical equipment, especially when many pieces of such equipment are present and the different pieces of equipment require different DC voltages. Option (2) is rather space consuming and also expensive. Option (3) does offer a cheap solution and also requires limited space, but only works well in simple cases, due at least to the following disadvantages: only one DC voltage value is obtainable, no galvanic isolation is provided between input and output of the DC connector to each specific piece of equipment, the daisy-chain cable has a fixed number of output plugs and the distance between these plugs are predetermined by the layout of the cable and cannot be adapted optimally to each specific use situation. Furthermore, most daisy- chain cables offer only one size and polarity of the DC plugs. Finally, option (4), although flexible and adaptable, is an expensive solution, especially when a large number of different pieces of equipment are used.

In any case, using prior art solutions, the only possibility to add more isolated DC outlets to an existing setup is to add another plug-in mains adapter, or use a second dedicated multi-outlet isolated power supply. Thereby, a number of additional boxes are added to the setup which is not practical, could be unreliable and at any rate is not desirable from an aesthetical point of view. It is known within the art that optimal powering of electrical musical equipment, such as electrical guitar effect pedals, is only achieved when each piece of equipment is powered by an isolated source to avoid ground-loop related hum and/or one piece of equipment inducing noise into another via a non-isolated power bus (traditional daisy-chain).

It would hence be desirable to have access to a simple and versatile DC power supply system for electrical musical instruments or accessories for such instruments that could easily be adapted to different specific use situations and that would, at least substantially, provide a more optimal solution to the problem of providing electrical musical equipment with the required DC power.

DISCLOSURE OF THE INVENTION

The above and further objects, and advantages are obtained by the DC power connector according to a first aspect of the present invention and the DC power system according to a second aspect of the present invention.

Thus, according to a first aspect of the invention, there is provided a DC power connector configured for connection to the power supply input terminal on a musical instruments device or equipment, such as an effect pedal for an electric guitar, where the DC power connector contains an electronic circuit comprising means configured to provide galvanic isolation between an input terminal and an output terminal of the DC power connector.

In an embodiment of the first aspect, the galvanic isolation is provided by a switch-mode converter circuit comprising a transformer.

In an embodiment of the first aspect, the DC power connector is configured such that it enables a user from the DC power connector to choose the DC output voltage from the DC power connector, such that the output voltage corresponds to the DC voltage required for the musical instrument device.

In an embodiment of the first aspect, the DC power connector comprises a light indicator, such as a LED, the indicates the status of the converter. For instance, when the converter functions normally, the light indicator emits light, but in case the converter is over-loaded or short- circuited, the light indicator does not emit light. The light indicator can also be configured to other states of the connector, for instance indication which output voltage has been chosen. In an embodiment of the first aspect, the DC connector comprises an IDC connector (isolation displacement connector) configured to be connected to a DC supply cable supplying DC power from a DC power supply.

In an embodiment of the first aspect, the DC power connector is in electrical connection via a cable to a respective IDC connector, such that DC power can be supplied from a DC power supply via a DC power supply cable connected to the DC power supply by connecting the respective IDC connector to the DC power supply cable.

In an embodiment of the first aspect, the DC output voltage from the DC power supply is chosen by configuring the respective IDC to establish electrical contact with the appropriate wires or cores, such that the required DC output voltage is present between at least two of these wires or cores.

In an embodiment of the first aspect, the electronic circuit is provided with voltage choosing means configured to choose between different DC output voltages provided on the output terminal of the DC power connector.

In an embodiment of the first aspect, the voltage choosing means is a switch-mode converter.

The above and further objects and advantages are according to a second aspect of the present invention provided by a daisy-chain DC power supply system comprising a DC power supply cable connected to a DC power supply and at least one DC connector according to claim 2 such that the at least one DC connector(s) can be electrically connected to the DC power supply cable at those positions along the cable, where this connection is desired in a specific application.

According to a second aspect of the invention, there is provided according to a first aspect of the invention, there is provided a daisy-chain DC power supply system comprising a DC power supply cable connected to a DC power supply and at least one DC connector according to the first aspect of the invention, such that the at least one DC power connector can be electrically connected to the DC power supply cable at those positions along the cable, where this connection is desired in a specific application.

In an embodiment of the second aspect, the DC power cable comprises a wire or core at ground potential and a plurality of wires or cores at different electrical potentials relative to ground, where the configuration of the DC power cable is such that the ground wire or core, and at least one of said plurality of wires or cores at different electrical potential relative to ground can be electrically connected to said DC power connector via said IDC connector, whereby individual of said DC power connectors can be provided with DC power at different voltages relative to ground.

In an embodiment of the second aspect, the DC power cable is a ribbon cable.

In an embodiment of the second aspect, the daisy-chain DC power supply system comprises a plurality of DC connectors according to the first aspect, where adjacent connectors are electrically connected via a fixed cable connection, such that each connector is provided at a fixed position along the daisy-chain system.

In an embodiment of the second aspect, the DC power supply cable (the daisy-chain cable) is a multi-wire cable comprising at least three electrical wires, for instance one ground wire and two wires with different DC voltages relative to the ground wire. An example of a multi-wire cable suitable for use in the second aspect of the invention is a ribbon wire, but it is understood that other configurations of multi-wire cables could alternatively be used. Using IDC connectors configured for such cables it is possible to connect power supply outlets for the different pieces of equipment at the desired positions along the multi-wire cable, where each individual outlet has the DC voltage specifically required for that particular piece of equipment.

According to the aspects of the present invention there is provided a solution to the provision of electrical musical equipment of various kinds, including systems composed of different kinds of such equipment, offering the advantage of a daisy-chain cable system (such as light weight, no need for bulky power supplies and thus requiring only a very limited space) with the flexibility of different plug types, distances in-between plugs and the very important feature of galvanic isolation for each piece of equipment, such as each individual effect pedal.

By applying switch-mode conversion technology, the present invention provides a small converter offering galvanic isolation from source and determination of output voltage which will fit into the plug itself supplying the power to a piece of equipment. The plugs according to the invention can be made as different plug types and both polarities to match the needs of different pieces of equipment, either with fixed voltages or selectable with a switch individually on each plug.

According to the invention, the use of IDC connector as the input for the plug with integrated isolating converter and one cable which functions as a power bus allow making a daisy-chain where the user can decide the number of plugs on the daisy-chain cable and the distance in- between the plugs. BRIEF DESCRIPTION OF THE DRAWINGS

Further benefits and advantages of the present invention will become apparent after reading the detailed description of non-limiting exemplary embodiments of the invention in conjunction with the accompanying drawings, wherein figure 1 shows a schematic representation of a DC power supply connector according to an embodiment of the invention; figure 2 shows a schematic representation of a prior art effect pedal board powered by a power supply unit; figure 3 shows a schematic representation of three alternative embodiments of a DC power supply connector according to the invention; figure 4 shows a schematic representation of an embodiment of a DC power supply connector according to the invention comprising an IDC connector configured for electrical connection to a four-wire ribbon cable; figure 5 shows a schematic representation of alternative daisy-chain arrangements applying embodiments of the DC power supply connector of the present invention; and figure 6 shows a schematic representation of still another daisy-chain arrangement, in which adjacent connectors are electrically connected by a fixed wire connection, such that each connector is provided at a fixed position along the daisy-chain.

DETAILED DESCRIPTION OF THE INVENTION

The principles of the invention will be illustrated by various embodiments hereof. It is however understood that a person skilled in the art may conceive other embodiments than those actually shown and described in the detailed description of the invention and that the scope of the invention is defined by the independent claims.

With reference to figures 1 (a), (b) and (c) there is shown a schematic representation of a DC power supply connector according to an embodiment of the invention generally designated by reference numeral 1 . The connector comprises a housing 2 and a terminal member consisting of a cylindrical outer terminal 3 surrounding a coaxially positioned inner cylindrical terminal 5, which configuration is well known in the art. The terminal member is attached to a printed circuit board (PCB) 4 and in electrical communication with the electrical components in the connector. These comprise a galvanic isolating circuit 6, which could for instance be a switch mode converter with a transformer to achieve galvanic isolation. The terminal member 3, 5 constitutes the output of the connector that provides electrical power to a piece of electronic musical equipment, such as an effect pedal for an electric guitar. The electrical input terminal of the connector is in the shown embodiment provided as an IDC connector 7, although other electrical input connector means could alternative be used as described below, without thereby departing from the scope of the present invention.

With reference to figure 2 there is shown a schematic representation of a prior art effect pedal board 10 comprising in the shown example of four effect pedals 1 1 , 12, 13, 14 powered by a power supply unit (PSU) 8 connected to mains voltage by a power cord 9. An electric signal is provided from an electronic musical instrument, such as an electric guitar, via line 1 9 to a first pedal 14 and from this pedal via intermediate lines 18, 17 and 16 respectively, to the series of pedals 13, 12 and 1 1 . The output terminal of pedal 1 1 is connected via line 15 to an amplifier that via a loudspeaker provides amplified sound to the surroundings.

The PSU 8 provides a DC voltage to each of the pedals 1 1 , 12, 13 and 14 via individual DC power connectors 8’, all of which are connected to a common line 8” acting as a DC power supply bus.

In case the DC power connectors 8’ provides an ohmic connection (i.e. a connection without galvanic isolation or separation between the input and the output of the connector), electrical hum may be generated caused by the ground loops (“hum loops”) 20, 21 and 22 as shown in figure 2. Galvanic isolation between the input and output terminals of the individual DC power connectors 8’ will substantially solve this problem.

The desired galvanic isolation is according to the present invention obtained by a DC power connector, of which an embodiment is shown in figure 1 and which has been described above.

With reference to figures 3(a), (b) and (c) there is shown a schematic representation of three alternative embodiments of a DC power supply connector according to the invention. Thus, figure 3(a) shows an external view of one embodiment having a housing 23 and the output terminal member 24. The electrical input from a suitable DC power supply (not shown in the figure) is in this embodiment via a cable 25 that could provide ground potential and a given voltage relative to ground, for instance +9 volt. It would also be possible to apply a cable with multiple wires providing for instance ground, +9 volts, -9volts, +18 volts and -18 volts to the connector. Instead of the cylindrical cable shown in figure 3(a), other cord configurations may alternatively be used, for instance a flat cable (ribbon cable).

Figure 3(b) shows another embodiment of a connector according to the invention, in which the cable 25 has been replaced by an input socket 29, 30 that can be electrically connected to DC power supply via a corresponding connector and cable.

Figure 3(c) shown a second version of the connector shown in figure 3(b), in which a rectangular socket 34 that in the shown example comprises four electrical terminals 35 is used.

With reference to figure 4 there is shown a schematic representation of an embodiment of a DC power supply connector according to the invention in which the DC input terminal to the connector is provided by an IDC connector 39, that in the shown example is configured for electrical connection to a four-wire ribbon cable 40, where for instance wire 41 could be at ground potential, wire 42 at +9 volts relative to ground, wire 43 at +12 volts relative to ground and wire 44 at +18 volts relative to ground. Of course, other numbers of wires and other electrical potentials could also be chosen. The IDC 39 is in the shown embodiment attached to the connector housing 36 on an extension 38 to the housing 36, but the IDC 39 could alternatively be attached to the housing 36 itself, in this case without the housing being provided with an extending portion 38.

Alternatively, the four-wire ribbon cable 40 with four wires (also termed“cores”), can have the two outer cores at ground potential and the remaining two inner cores at +9 volts relative to ground. When this wire configuration is used, it does not matter which way the IDC 49 is snapped onto the cable 40. Also, if one core is damaged, there will still be a connection through the remaining cores and DC power will still be provided to the particular piece of equipment. This kind of core configuration can also be applied to ribbon cables and the corresponding IDC with other numbers of cores, provided there are an even number of cores, or - alternatively - that only one ground potential core is used, the middle one.

The connector according to the different embodiments of the present invention can be used in a complete DC power supply system for electric musical equipment in many different ways. Two such systems according to the present invention are shown in figures 5(a) and (b), respectively.

With reference to figure 5(a) there is shown a schematic representation of a daisy-chain system according to the invention applying embodiments of the DC power connector of the present invention. In the illustrative example shown in figure 5(a), five DC power connectors 46 according to the invention are used. Each of these are provided with an individual IDC connector 47. A connector 45 is configured to be connected to a DC voltage source 49 and a cable 48 extends through the entire system of DC power connectors 46, where each individual of the DC power connectors 46 is connected at the appropriate position along the cable 48 via the individual IDCs 47. In this manner it is possible to provide the individual DC power connectors 46 at precisely those locations along the cable 48 that is optimal in the specific use situation.

An alternative daisy-chain system according to the invention is illustrated in figure 5(b). A common DC power bus cable 54 is at one end connected to a DC power supply 55 via the connector 50. However, contrary to the system shown in figure 5(a), each DC power connector 51 according to the invention is of the type shown in figure 3(a), i.e. provided with its individual DC input cable 56, 57, 58, respectively. At the end of each of these DC input cables there is provided a IDC connector 52, 52’, 52”, respectively, that are configured to be snapped on to the DC power bus cable 54 at the appropriate positions along this cable. The IDCs may be provided with individual housings 52 via which the respective cable 56, 17, 18 is connected to the respective IDC.

Both in the system shown in figure 5(a) and 5(b), the power bus cables 48 and 54, respectively can be for instance multi-core ribbon cables, such that each individual DC power connector 46, 51 have access to different voltages, whereby the specific voltage required by each piece of electrical musical equipment can be provided via the corresponding DC power connector.

With reference to figure 6 there is shown a schematic representation of still another daisy- chain arrangement, in which adjacent connectors 46 are electrically connected by a fixed wire connection 48, such that each connector is provided at a fixed position along the daisy- chain.According to the invention it would also be possible to apply a combination of the embodiments shown in figures 5(a), 5(b) and 6, i.e. applying a combination of IDC connections and fixed wire connections in the daisy-chain system.

Although the present invention has been described in detail by some specific embodiments of the DC power connector and the DC power system according to the invention, it is understood that other embodiments of the DC power connectors and the DC power system could be conceived without these departing from the scope of protection defined by the claims.