KIM, Suk-Ho (1503/107 Whaseong mansion, Jisan2-dongSuseong-gu, Daegu 706-911, KR)
KIM, Suk-Ho (1503/107 Whaseong mansion, Jisan2-dongSuseong-gu, Daegu 706-911, KR)
Claims
[1] A low-power type external power adaptor (more than IW and less than 51W) including an iron core 20 formed of a silicon steel plate, wherein the iron core 20 inside of an external power adaptor 10 is configured such that the iron core loss (W/kg) is less than 4.40 when in pi 5/50 to thereby have a power efficiency minimally satisfying 0.09xLn (labeled output)+0.5 and to thereby have a required consumption power of less than 0.5W at an input side.
[2] The power adaptor according to claim 1, wherein the iron core has a thickness of
0.35t. |
Description LOWER-POWER TYPE EXTERNAL POWER ADAPTOR
Technical Field
[1] The present invention relates to a lower-power type external power adaptor (more than IW and less than 51W) using a silicon steel plate. More specifically, a conventional external power adaptor has been designed and fabricated conforming to the input and output, i.e., designed and used so as to match the output, regardless of the magnitude of consumption power, for example, when the input is 120V and the output is 9V 35OmA, 6.5V 350mA, 6.0V 500mA, 9V 500mA, 9V 20OmA, 9V 45OmA, or the like.
[2] In recent years, however, regulation of the specification for consumption power during the stand-by has become stricter. Thus, the adaptor using an iron core does not solve a problem associated with the low-power required by the U.S. and an expensive switching adaptor has been developed and used. Background Art
[3] The present invention provides an adaptor which is less expansive than existing adaptors configured to meet the requirements in the U.S., can be manufactured with less complicated facilities and less labors, and thus can replace the expansive switching adaptor.
Disclosure of Invention Technical Problem
[4] Accordingly, the present invention has been made in an effort to solve the problems occurring in the prior art. It is an object of the invention to provide a lower-power type external power adaptor capable of reducing the power loss at stand-by occurring in the external power adaptor using an existing iron core, overcoming the iron core loss occurring in the internal iron core of the existing adaptor, and thus lowering the iron core loss, thereby enabling to meet the efficiency required in the U.S.. Technical Solution
[5] At the present, the regulatory requirement of the U.S. prescribes the power efficiency and the stand-by power consumption at the output side. The requirements for the power efficiency vary with the output. In case where it is more than IW and less than 5 IW, 0.09xLn (labeled output)+0.5 is required, and the power consumption at the input side is required to be less than 0.5W.
[6] Therefore, the present invention is configured such that the iron core loss (W/kg) of an iron core formed of a silicon steel plate is less than 4.40 when in pl5/50, thereby meeting the US specification and requirements.
[7]
Mode for the Invention
[8] Hereinafter, exemplary embodiments of the invention will be explained in details with reference to the accompanying drawings. FIG. 1 is a sectional view illustrating the present invention, and Fig. 2 is a perspective view of an iron core according to an embodiment of the invention.
[9] FIG. 2 is a perspective view of the iron core according to the invention. In the adaptor structured as in FIG. 1, the iron core 20 has been used up until now, regardless of the loss of the silicon steel plate itself. In recent years, however, it is standardized with reference to the degree of iron loss of the silicon steel plate. The adaptor 10 of FIG. 1 is configured so as to meet the standards and specifications required in each country.
[10] In the existing products, the iron core 20 is formed of a typical core using an ordinary silicon steel plate. In the present invention, however, the iron core 20 is formed of a silicon steel plate having an iron core loss (W/kg) of less than 4.40 when in p 15/50. Thus, the adaptor of the invention meets the requirements of the U.S., including the power efficiency, a lowest power consumption limit 0.09XLn(Labeled output)+0.5 when in a stand-by mode, and a consumption power of less than 0.5W at the input side. Therefore, in the following examples, in case where the input is 120V and the output is 9V 350mA, at minimum an efficiency of 60.3% must be satisfied as 0.09xLn(9x0.35)+0.5=0.09xLn3.15+0.5=0.09x1.11474+0.5=0.603, and the required consumption power of input must be less than 0.5W.
[11] As shown in the following tables, several experiments have been conducted under the following conditions.
[12] The experimental conditions are as follows. The supply power is 115V/60Hz (the standard in California state of the U.S.), and the whole high frequency until the 13 th high frequency is to be less than 2%. As a preparation before experiment, the measurement has been conducted after 30 minutes of aging at the rated output current. The output measurement is carried out at the very end of the output cord of the AC- adaptor, and the measurement is conducted after the load condition is adjusted so as to become a static current. The measurements were performed at 100%, 75%, 50%, 25% and 0% of the rated current. The measurement has been conducted and recorded when after 5 minutes of adjustment the input current fluctuation is at 5% of the maximum value.
[13] (1) In case of using a conventional adaptor of input 12Ov and output of 9 V 350mA
(using 0.5t of a conventional silicon steel plate)
[14] (US Power Efficiency: Required efficiency is 60.3%, and required consumption
power at input is less than 0.5W)
[15] [Table 1] [16]
[17] As can be seen in the above table, the conventional product has an input of 120V and the output of 9V 350mA and has used an existing core of 0.5t. The power efficiency is 52.8%, which does not meet the US requirement of 60.3%. The consumption input power specification at stand-by (0%) is 0.58W, which is beyond the required power of 0.5W.
[18] Therefore, the power efficiency of the adaptor is 52.8%, which does not reach 60.3% of the US requirement, and thus it is not suitable for general purposes. In addition, the input power consumption at stand-by (0%) is 0.58W, which goes beyond the prescribed value 0.5W, i.e., does not meet the recent US requirement for the power efficiency.
[19] [20] (2) In case of experiment for input 120V and output 9V350mA [21] (Using 0.5t core having an iron loss of less than 4.40 when in pi 5/50) [22] (US Power Efficiency: Required efficiency is 60.3%, and required consumption power at input is less than 0.5W)
[23] [Table 2] [24]
Output Output Input Input ower (W) Current (mA) Voltage (V) Current (mA) P
0 mA
0.36
Efficiency 14.88 11.69 (%)
19.4 1.64
87.5 mA 2.09 2.87
175 mA 54.5 29.66
4.07
262.5 mA 64.7 9.38 39.76
35OmA 60.5 8.3 49.41 5.23
[25] In order to solve the problems with conventional product, the present invention is constructed using a silicon steel plate of 0.5t having an iron core loss (W/kg) of less
than 4.40 when in pi 5/50. As the results of experiments and measurements shown in the above table, when the input is 120V and the output is 9V 35OmA, the power efficiency is 61.31% as compared with the US requirement of 60.3%, and the input consumption power at stand-by (0%) is 0.36W as compared with the requirement of 0.5 W. Although the error in the power efficiency has been considerably reduced as compared with the conventional products, a stable margin is not achieved. Thus, it is not suitable to replace the expensive switching adaptor satisfying the US requirement for power efficiency.
[26] [27] (3) In case of experiment for input 120V and output 9V350mA [28] (Using 0.35t core having an iron loss (W/kg) of less than 4.40 when in pi 5/50) [29] (US Power Efficiency: Required efficiency is 60.3%, and required consumption power at input is less than 0.5W)
[30] [Table 3] [31]
[32] Accordingly, in order to maximally reduce the error in the required efficiency and forming a stable margin, the iron core 20 is formed of a 0.35t silicon steel plate having an iron core loss (W/kg) of less than 4.40 when in pi 5/50. As shown in the above table, when the experiment is carried out with the input of 120V and the output of 9 V 350mA, the power efficiency is 64.88%, which is higher than the US requirement of 60.3%, thereby providing for a stable margin. The input consumption power at standby (0%) is 0.36W as compared with the requirement of 0.5W. Thus, a more stable margin is achieved, as compared with when the experiment is conducted with 0.5t of iron core 20.
[33] Therefore, the above exemplary experiments were conducted at the output 9V 350mA and shows that, in case where the iron core 20 has an iron core loss (W/kg) of less than 4.40 when in pl5/50, the power-saving effect required in the U.S. can be achieved.
[34] The present invention can be applied to other adaptors having various outputs such as 6.5V 350mA, 6.0V 500mA, 9V 500mA, 9V 20OmA and 9V 45OmA, along with the above 9V 350mA. In that case, although the iron core 20 can be varied with the outputs
of an adaptor, the iron core loss (W/kg) is to be configured so as to have less than 4.40 when in p 15/50, in order to meet the power efficiency required in the U.S., as shown in the above examples.
[35] According to the invention, the iron core 20 is formed of a silicon steel plate having an iron core loss (W/kg) of less than 4.40 when in pi 5/50, thereby achieving the energy saving required by the U.S., which have been problems with conventional products. The present invention provides for a significant result of replacing the expensive switching adaptors.
[36] Although the present invention has been described with reference to several embodiments of the invention, the description is illustrative of the invention and is not to be construed as limiting the invention. Various modifications and variations may occur to those skilled in the art, without departing from the spirit and scope of the invention as defined by the appended claims.