JP2005110472A - Power supply circuit - Google Patents

Power supply circuit Download PDF

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JP2005110472A
JP2005110472A JP2003344135A JP2003344135A JP2005110472A JP 2005110472 A JP2005110472 A JP 2005110472A JP 2003344135 A JP2003344135 A JP 2003344135A JP 2003344135 A JP2003344135 A JP 2003344135A JP 2005110472 A JP2005110472 A JP 2005110472A
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Prior art keywords
power supply
power
capacitor
circuit
load
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Inventor
Yuji Tani
祐二 谷
Masanori Kasai
正礼 河西
Yohei Suzuki
洋平 鈴木
Satoshi Kida
聡 木田
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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    • Y02E40/40—Arrangements for reducing harmonics

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Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem wherein there is a limit for reducing the power consumption during waiting, since a conventional power supply circuit requires a power failure detecting circuit for detecting the disconnection of a power supply plug from an AC power supply. <P>SOLUTION: A capacitor 3 for preventing noises and a discharge resistor 4 are connected in parallel. The capacitor 3 and a circuit breaking means 5 for executing opening operations during waiting are connected between AC line in a series state. According to this constitution, the capacitor 3 is connected between the AC lines during operation. Propagation of electrical noises generated from a load 2 to the AC power supply is prevented. When the power supply plug 1 is disconnected from the AC power supply, the discharge resistor 4, connected in parallel with the capacitor 3, discharges a residual voltage of the capacitor 3. Since the capacitor 3 is disconnected from the AC lines during a waiting state, residual voltage will not be generated in the power supply plug 1 so that it will not become an unsafe state, power not consumed by the disconnection of the discharge resistor 4 from the AC lines, and power consumption in the waiting state is made small. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、交流電源に電源プラグにて接続する機器の電源回路に関するものである。   The present invention relates to a power supply circuit for equipment connected to an AC power supply with a power plug.

従来の電源回路としてはノイズ防止コンデンサと放電抵抗がＡＣライン間に常時接続されているものがあった（例えば特許文献１参照）。図５は特許文献１に記載された従来の電源回路の構成を示すブロック図である。   As a conventional power supply circuit, there is a circuit in which a noise prevention capacitor and a discharge resistor are always connected between AC lines (see, for example, Patent Document 1). FIG. 5 is a block diagram showing a configuration of a conventional power supply circuit described in Patent Document 1. In FIG.

図５において、交流電源に接続する電源プラグ１とＡＣライン間に接続される負荷２と負荷２から発生する電気ノイズが交流電源に伝播することを防ぐコンデンサ３と電源プラグ１を交流電源から切断直後に電源プラグ１に残留する電圧による不安全を防止するためにコンデンサ３の残留電圧を放電する放電抵抗４から構成され、待機状態時においても放電抵抗４が電力を消費するため、待機状態時の消費電力が大きいという課題があった。放電抵抗４による無駄な消費電力を小さくする為に放電抵抗４の抵抗値を大きくする場合は、コンデンサ３の残留電圧を放電させる為に相対的にコンデンサ３の容量も小さくする必要があり、交流電源に伝播する電源ノイズが増えるという課題があった。これらの課題に対応した電源回路として、特許文献１，２，３，４に記載されているものがある。   In FIG. 5, the power plug 1 connected to the AC power source and the load 2 connected between the AC lines and the capacitor 3 and the power plug 1 for preventing electrical noise generated from the load 2 from propagating to the AC power source are disconnected from the AC power source. Immediately after that, in order to prevent unsafety due to the voltage remaining in the power plug 1, the discharge resistor 4 discharges the residual voltage of the capacitor 3, and the discharge resistor 4 consumes power even in the standby state. There was a problem that the power consumption is large. When the resistance value of the discharge resistor 4 is increased in order to reduce the wasteful power consumption by the discharge resistor 4, it is necessary to relatively reduce the capacity of the capacitor 3 in order to discharge the residual voltage of the capacitor 3. There was a problem that power supply noise propagated to the power supply increased. As power supply circuits corresponding to these problems, there are those described in Patent Documents 1, 2, 3, and 4.

図６は前記特許文献１、３、４に記載された電源回路の構成を示している。図６において図５と同じ構成要素は同じ番号を付与し説明を省略する。交流電源が遮断されると停電信号を発生する第三の停電検知回路１０がＡＣライン間に接続され、前記第三の停電検知回路１０からの停電信号により短絡動作する第四の回路遮断手段１１と放電抵抗４が直列状態でＡＣライン間に接続されている。この構成とすることで電源プラグ１を交流電源から切断した場合は、コンデンサ３に放電抵抗４が接続され、電源プラグ１が交流電源に接続されている場合は放電抵抗４がＡＣラインから切断されるので、待機状態時の消費電力を小さくすることができる。   FIG. 6 shows the configuration of the power supply circuit described in Patent Documents 1, 3, and 4. In FIG. 6, the same components as those in FIG. When the AC power supply is shut off, a third power failure detection circuit 10 that generates a power failure signal is connected between the AC lines, and a fourth circuit cutoff means 11 that is short-circuited by the power failure signal from the third power failure detection circuit 10. And the discharge resistor 4 are connected in series between the AC lines. With this configuration, when the power plug 1 is disconnected from the AC power source, the discharge resistor 4 is connected to the capacitor 3, and when the power plug 1 is connected to the AC power source, the discharge resistor 4 is disconnected from the AC line. Therefore, power consumption in the standby state can be reduced.

図７は、図６に記載の電源回路で第三の停電検知回路１０を、交流電源が遮断されると停電信号を発生すると共に負荷２を安全に停止させる第二の停電検知回路７に置き換えたものである。電源プラグ１が交流電源から切断された場合に放電抵抗４がＡＣライン間に接続される動作は図６記載の電源回路と同じである。   7 replaces the third power failure detection circuit 10 in the power supply circuit shown in FIG. 6 with a second power failure detection circuit 7 that generates a power failure signal and safely stops the load 2 when the AC power is cut off. It is a thing. The operation of connecting the discharge resistor 4 between the AC lines when the power plug 1 is disconnected from the AC power supply is the same as that of the power supply circuit shown in FIG.

図８は、前記特許文献２に記載された電源回路の構成を示している。図８において、図５、図６と同じ構成要素は同じ番号を付与し説明を省略する。第三の停電検知回路１０からの停電信号により開放動作となる第二の回路遮断手段８とコンデンサ３が直列状態でＡＣライン間に接続されている。この構成とすることで、電源プラグ１を交流電源から切断した場合はコンデンサ３がＡＣラインから切り離されるので電源プラグ１に残留電圧が発生せず放電抵抗４が不必要であり、待機状態時の消費電力を小さくすることができる。
特開平１１−１７７３６９号公報 特開平６−２４５３８２号公報 特開２００２−４８３７５号公報 特開平３−２７７７４号公報 FIG. 8 shows the configuration of the power supply circuit described in Patent Document 2. In FIG. 8, the same components as those in FIGS. The second circuit breaking means 8 and the capacitor 3 which are opened by the power failure signal from the third power failure detection circuit 10 are connected between the AC lines in series. With this configuration, when the power plug 1 is disconnected from the AC power supply, the capacitor 3 is disconnected from the AC line, so that no residual voltage is generated in the power plug 1 and the discharge resistor 4 is not required. Power consumption can be reduced.
JP-A-11-177369 JP-A-6-245382 JP 2002-48375 A JP-A-3-27774

しかしながら、図６、図７、図８に示される従来の電源回路では、電源プラグ１が交流電源から切断されたことを検知する為にＡＣライン間に第三の停電検知回路１０または第
二の停電検知回路７を接続することが必要であり、第三の停電検知回路１０または第二の停電検知回路７が電力を消費するために、待機時の消費電力を小さくすることに限界があった。 However, in the conventional power supply circuit shown in FIGS. 6, 7, and 8, the third power failure detection circuit 10 or the second power supply detection circuit 10 is connected between the AC lines in order to detect that the power plug 1 is disconnected from the AC power supply. Since it is necessary to connect the power failure detection circuit 7 and the third power failure detection circuit 10 or the second power failure detection circuit 7 consumes power, there is a limit to reducing the power consumption during standby. .

本発明は前記従来の課題を解決するもので、待機時の消費電力を小さくした電源回路を提供することを目的とする。   The present invention solves the above-described conventional problems, and an object thereof is to provide a power supply circuit in which power consumption during standby is reduced.

前記従来の問題を解決するために本発明の電源回路は、待機時と動作時で回路遮断手段により回路構成を切り替えることで、待機状態時の消費電力を小さくするものである。   In order to solve the above-mentioned conventional problems, the power supply circuit of the present invention reduces the power consumption in the standby state by switching the circuit configuration by the circuit shut-off means during standby and during operation.

以上のように、本発明の電源回路によれば、待機時と動作時で回路遮断手段により回路構成を切り替えることで、待機状態時の消費電力を小さくすることができる。   As described above, according to the power supply circuit of the present invention, the power consumption in the standby state can be reduced by switching the circuit configuration by the circuit shut-off means during standby and during operation.

以下本発明の実施の形態について図面を参照しながら説明する。   Embodiments of the present invention will be described below with reference to the drawings.

（実施の形態１）
図１は、本発明の実施の形態１における電源回路の構成を示すブロック図である。 (Embodiment 1)
FIG. 1 is a block diagram showing a configuration of a power supply circuit according to Embodiment 1 of the present invention.

図１において交流電源に接続される電源プラグ１と、ＡＣライン間に接続される負荷２と、負荷２から発生する電気ノイズが交流電源に伝播することを防ぐ目的で設けられるコンデンサ３と、電源プラグ１が交流電源から切断されたときに前記コンデンサ３に残る電荷を放電させる目的で設けられる放電抵抗４と、待機状態時に負荷２からの待機信号により開放動作する回路遮断手段５から構成され、コンデンサ３と放電抵抗４が並列接続され、コンデンサ３と回路遮断手段５が直列状態でＡＣライン間に接続されている。この構成とすることで、負荷２が動作時はコンデンサ３がＡＣライン間に接続されるため負荷２から発生する電気ノイズが交流電源に伝播することを防ぐことが可能であり、負荷２が動作時に電源プラグ１を交流電源から切断した場合は放電抵抗４がコンデンサ３に並列接続されているのでコンデンサ３の残留電圧を放電することが可能である。また待機状態時に電源プラグ１を交流電源から切断した場合は放電抵抗４がＡＣラインから切断されているので電源プラブ１に残留電圧が発生することがなく不安全とならず、放電抵抗４がＡＣラインから切断されているので放電抵抗４が電力を消費せず待機状態の消費電力を小さくできる。なお、待機状態時にコンデンサ３がＡＣラインから切断されるが負荷２が停止状態であるので電気ノイズは発生しないか小さく、問題になることはない。必要ならばコンデンサ３を切り離すのではなく小容量に切替えてもよい。   In FIG. 1, a power plug 1 connected to an AC power source, a load 2 connected between AC lines, a capacitor 3 provided for the purpose of preventing electrical noise generated from the load 2 from propagating to the AC power source, A discharge resistor 4 provided for the purpose of discharging the charge remaining in the capacitor 3 when the plug 1 is disconnected from the AC power supply, and a circuit shut-off means 5 that opens in response to a standby signal from the load 2 in a standby state; The capacitor 3 and the discharge resistor 4 are connected in parallel, and the capacitor 3 and the circuit breaking means 5 are connected in series between the AC lines. With this configuration, since the capacitor 3 is connected between the AC lines when the load 2 is operating, it is possible to prevent electrical noise generated from the load 2 from propagating to the AC power supply, and the load 2 operates. Sometimes, when the power plug 1 is disconnected from the AC power supply, the discharge resistor 4 is connected in parallel to the capacitor 3, so that the residual voltage of the capacitor 3 can be discharged. Further, when the power plug 1 is disconnected from the AC power supply in the standby state, the discharge resistor 4 is disconnected from the AC line, so that no residual voltage is generated in the power plug 1 and it is not unsafe. Since it is disconnected from the line, the discharge resistor 4 does not consume power, and the power consumption in the standby state can be reduced. Although the capacitor 3 is disconnected from the AC line in the standby state, the load 2 is in a stopped state, so that electric noise is not generated or is small, and there is no problem. If necessary, the capacitor 3 may be switched to a small capacity instead of being disconnected.

（実施の形態２）
図２は、本発明の実施の形態２における電源回路の構成を示すブロック図である。図２において、図１と同じ構成要素については同じ符号を用い、説明を省略する。 (Embodiment 2)
FIG. 2 is a block diagram showing the configuration of the power supply circuit according to Embodiment 2 of the present invention. In FIG. 2, the same components as those in FIG.

図２において、交流電源が遮断されたことを検知すると負荷を安全に停止させる停電検知回路６がコンデンサ３に並列接続されている。この構成とすることで、負荷２が動作時に交流電源が遮断された場合に負荷２を安全に停止させることが可能であると同時に、待機状態時には停電検知回路６がＡＣラインから切断されるので待機状態時の消費電力を小さくすることができる。なお、待機状態時には停電検知回路６がＡＣラインから切り離され交流電源の遮断を検知できないが、待機状態時は負荷２は停止しているので問題とならない。   In FIG. 2, a power failure detection circuit 6 that safely stops the load when it is detected that the AC power supply has been cut off is connected in parallel to the capacitor 3. With this configuration, it is possible to safely stop the load 2 when the AC power supply is interrupted when the load 2 is in operation, and at the same time, the power failure detection circuit 6 is disconnected from the AC line in the standby state. The power consumption in the standby state can be reduced. In the standby state, the power failure detection circuit 6 is disconnected from the AC line and cannot detect the interruption of the AC power supply. However, since the load 2 is stopped in the standby state, there is no problem.

（実施の形態３）
図３は、本発明の実施の形態３における電源回路である。図３において、図１と同じ構成要素に付いては同じ符号を用い、説明を省略する。交流電源が遮断されたことを検知すると負荷２を安全に停止させると共に停電信号を発生する第二の停電検知回路７と回路遮断手段５が直列状態でＡＣライン間に接続され、第二の停電検知回路７からの停電信号で開放動作する第二の回路遮断手段８とコンデンサ３が直列状態でＡＣライン間に接続されている。このような構成とすることで、図１に記載の電源回路と同様に待機状態時の消費電力が小さく、図２に記載の電源回路と同様に負荷２が動作中に交流電源が遮断された場合も負荷を安全に停止させることが可能で、図２に記載の電源回路と比較して放電抵抗４が存在せず負荷２が動作時の消費電力も小さくすることができる。 (Embodiment 3)
FIG. 3 shows a power supply circuit according to Embodiment 3 of the present invention. In FIG. 3, the same components as those in FIG. When it is detected that the AC power supply is cut off, the load 2 is safely stopped and a power failure signal is generated, and a second power failure detection circuit 7 and a circuit interruption means 5 are connected in series between the AC lines, and the second power failure The second circuit breaker 8 that opens in response to a power failure signal from the detection circuit 7 and the capacitor 3 are connected in series between the AC lines. By adopting such a configuration, the power consumption in the standby state is small as in the power supply circuit shown in FIG. 1, and the AC power supply is shut off while the load 2 is operating as in the power supply circuit shown in FIG. In this case, the load can be safely stopped, and the discharge resistor 4 is not present and the power consumption when the load 2 is operating can be reduced as compared with the power supply circuit shown in FIG.

（実施の形態４）
図４は、本発明の実施の形態４における電源回路の構成を示すブロック図である。図４において、図１と同じ構成要素に付いては同じ符号を用い、説明を省略する。 (Embodiment 4)
FIG. 4 is a block diagram showing a configuration of a power supply circuit according to Embodiment 4 of the present invention. In FIG. 4, the same components as those in FIG.

図４において、第二の停電検知回路７とコンデンサ３が並列に接続され、待機状態時に負荷２からの待機信号により開放動作すると共に前記第二の停電検知回路７からの停電信号によっても開放動作する第三の回路遮断手段９とコンデンサ３が直列状態でＡＣライン間に接続されている。この構成とすることで、図１に記載の電源回路と同様に待機状態時の消費電力が小さく、図２に記載の電源回路と同様に負荷２が動作中に交流電源が遮断された場合も負荷を安全に停止させることが可能で、図３に記載の電源回路と同じく動作時の消費電力も小さくすることができ、図３に記載の電源回路と比較して回路遮断手段の個数が少なく、より少ない部品点数で電源回路を実現する事ができる。   In FIG. 4, the second power failure detection circuit 7 and the capacitor 3 are connected in parallel, and in the standby state, the release operation is performed by the standby signal from the load 2 and the release operation is also performed by the power failure signal from the second power failure detection circuit 7. The third circuit breaking means 9 and the capacitor 3 are connected in series between the AC lines. With this configuration, the power consumption in the standby state is small as in the power supply circuit shown in FIG. 1, and the AC power supply can be cut off while the load 2 is operating as in the power supply circuit shown in FIG. 2. The load can be safely stopped, the power consumption during operation can be reduced in the same manner as the power supply circuit shown in FIG. 3, and the number of circuit interruption means is smaller than that of the power supply circuit shown in FIG. A power circuit can be realized with a smaller number of parts.

以上のように、本発明にかかる電源回路は、電気ノイズの交流電源への伝播と電源プラグの残留電圧の発生を防ぎつつ待機状態の消費電力を小さくできるので、空気調和機等の発生ノイズが大きく商用電源に接続したままで動作していない待機状態が長い電気機器の用途に適用できる。   As described above, the power supply circuit according to the present invention can reduce power consumption in a standby state while preventing propagation of electrical noise to an AC power source and generation of a residual voltage of a power plug. It can be applied to the use of electrical equipment that has a long standby state that is not operating while being connected to a large commercial power source.

本発明の実施の形態１における電源回路の構成を示すブロック図The block diagram which shows the structure of the power supply circuit in Embodiment 1 of this invention 本発明の実施の形態２における電源回路の構成を示すブロック図The block diagram which shows the structure of the power supply circuit in Embodiment 2 of this invention 本発明の実施の形態３における電源回路の構成を示すブロック図The block diagram which shows the structure of the power supply circuit in Embodiment 3 of this invention 本発明の実施の形態４における電源回路の構成を示すブロック図The block diagram which shows the structure of the power supply circuit in Embodiment 4 of this invention 従来の電源回路の構成を示すブロック図Block diagram showing the configuration of a conventional power supply circuit 従来技術の対策を取り入れた電源回路の構成を示すブロック図Block diagram showing the configuration of a power supply circuit that incorporates measures of the prior art 従来技術の対策を取り入れた別の電源回路の構成を示すブロック図Block diagram showing the configuration of another power supply circuit incorporating measures of the prior art 別の従来技術の対策を取り入れた別の電源回路の構成を示すブロック図Block diagram showing the configuration of another power supply circuit incorporating another prior art measure

符号の説明Explanation of symbols

１ 電源プラグ
２ 負荷
３ コンデンサ
４ 放電抵抗
５ 回路遮断手段
６ 停電検知回路
７ 第二の停電検知回路
８ 第二の回路遮断手段
９ 第三の回路遮断手段
１０ 第三の停電検知回路
１１ 第四の回路遮断手段 DESCRIPTION OF SYMBOLS 1 Power plug 2 Load 3 Capacitor 4 Discharge resistor 5 Circuit interruption means 6 Power failure detection circuit 7 Second power failure detection circuit 8 Second circuit interruption means 9 Third circuit interruption means 10 Third power failure detection circuit 11 Fourth Circuit interruption means

Claims (4)

交流電源に接続される電源プラグと、前記電源プラグのそれぞれの両端につながる電気ライン（以降、ＡＣラインと表現する）間に接続される負荷と、前記負荷から発生する電気ノイズが交流電源に伝播することを防ぐ目的で設けられるコンデンサと、前記電源プラグが交流電源から切断されたときに前記コンデンサに残る電荷を放電させる目的で設けられる放電抵抗と、前記電源プラグが交流電源に接続されて、かつ前記負荷が停止している状態（以降、待機状態と表現する）に開放動作する回路遮断手段から構成され、前記コンデンサと前記放電抵抗が並列接続され、前記コンデンサと前記回路遮断手段が直列状態でＡＣライン間に接続されていることを特徴とする電源回路。 A power plug connected to the AC power source, a load connected between the electrical lines connected to both ends of the power plug (hereinafter referred to as AC line), and electrical noise generated from the load propagate to the AC power source. A capacitor provided for the purpose of preventing, a discharge resistor provided for the purpose of discharging the charge remaining in the capacitor when the power plug is disconnected from the AC power source, and the power plug is connected to the AC power source, The circuit is composed of a circuit breaker that opens in a state where the load is stopped (hereinafter referred to as a standby state), the capacitor and the discharge resistor are connected in parallel, and the capacitor and the circuit breaker are connected in series. And a power supply circuit connected between the AC lines. 交流電源が遮断されたことを検知すると負荷を安全に停止させる停電検知回路がコンデンサに並列接続されていること特徴とする請求項１に記載の電源回路。 The power supply circuit according to claim 1, wherein a power failure detection circuit that stops the load safely when it is detected that the AC power supply is cut off is connected in parallel to the capacitor. 交流電源が遮断されたことを検知すると負荷を安全に停止させると共に停電信号を発生する第二の停電検知回路と回路遮断手段が直列状態でＡＣライン間に接続され、前記第二の停電検知回路からの停電信号で開放動作する第二の回路遮断手段とコンデンサが直列状態でＡＣライン間に接続されていることを特徴とする請求項１に記載の電源回路。 When it is detected that the AC power supply has been shut off, the load is safely stopped and a power failure signal is generated and a second power failure detection circuit and a circuit interruption means are connected in series between the AC lines. 2. The power supply circuit according to claim 1, wherein a second circuit breaking means that opens in response to a power failure signal from the capacitor and a capacitor are connected in series between the AC lines. 第二の停電検知回路とコンデンサが並列に接続され、待機状態時に開放動作すると共に前記第二の停電検知回路からの停電信号によっても開放動作する第三の回路遮断手段と前記コンデンサが直列状態でＡＣライン間に接続されていることを特徴とする請求項１に記載の電源回路。 The second power failure detection circuit and the capacitor are connected in parallel, and the third circuit cutoff means and the capacitor are opened in series in a standby state and opened in response to a power failure signal from the second power failure detection circuit. The power supply circuit according to claim 1, wherein the power supply circuit is connected between AC lines.
JP2003344135A 2003-10-02 2003-10-02 Power supply circuit Pending JP2005110472A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010287257A (en) * 2009-05-12 2010-12-24 Kazushige Komori Method and device for erasing magnetic data
WO2011030524A1 (en) * 2009-09-10 2011-03-17 パナソニック株式会社 Radio frequency heating apparatus
WO2011107257A3 (en) * 2010-03-02 2011-12-01 Minebea Co., Ltd. Electric device having low power consumption in the stand-by state
JP2012170217A (en) * 2011-02-14 2012-09-06 Toyota Industries Corp Vehicle charger
CN112415252A (en) * 2020-11-06 2021-02-26 深圳康佳电子科技有限公司 Method for measuring residual voltage of power plug and computer equipment

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010287257A (en) * 2009-05-12 2010-12-24 Kazushige Komori Method and device for erasing magnetic data
WO2011030524A1 (en) * 2009-09-10 2011-03-17 パナソニック株式会社 Radio frequency heating apparatus
US9974121B2 (en) 2009-09-10 2018-05-15 Panasonic Intellectual Property Management Co., Ltd. Radio frequency heating apparatus
WO2011107257A3 (en) * 2010-03-02 2011-12-01 Minebea Co., Ltd. Electric device having low power consumption in the stand-by state
US9136753B2 (en) 2010-03-02 2015-09-15 Minebea Co., Ltd. Electric device having low power consumption in the stand-by state
JP2012170217A (en) * 2011-02-14 2012-09-06 Toyota Industries Corp Vehicle charger
CN112415252A (en) * 2020-11-06 2021-02-26 深圳康佳电子科技有限公司 Method for measuring residual voltage of power plug and computer equipment

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