JP2011067037A - Overvoltage protection circuit - Google Patents

Overvoltage protection circuit Download PDF

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JP2011067037A
JP2011067037A JP2009216650A JP2009216650A JP2011067037A JP 2011067037 A JP2011067037 A JP 2011067037A JP 2009216650 A JP2009216650 A JP 2009216650A JP 2009216650 A JP2009216650 A JP 2009216650A JP 2011067037 A JP2011067037 A JP 2011067037A
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voltage
circuit
capacitor
reference voltage
relay
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Takahiro Fukunishi
孝浩 福西
Hirokazu Hayashi
弘和 林
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Panasonic Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To prevent the other capacitor from breaking down by overvoltage, when a short-circuit breakage occurs at one of capacitors, by detecting a voltage on the low-potential side of the serially-connected smoothing capacitors. <P>SOLUTION: In a circuit in which an AC power supply 1 is rectified by a rectifying means 6 via a relay 9 and smoothed by the smoothing capacitors 7a, 7b for performing supply of power to a load 11, a voltage detection means is connected to the smoothing capacitor 7b on the low-potential side; and a drive signal of a relay 19 is cut off, when the supply voltage exceeds a first reference voltage or does not exceed a second reference voltage, thereby an overvoltage protection circuit can be provided which can prevent the other capacitor from breaking down in a chain reaction, even when one of the smoothing capacitors 7a, 7b breaks down by short-circuiting. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、回路素子の破壊時に連鎖的に他の素子が破壊することを防止する、保護回路に関するものである。   The present invention relates to a protection circuit that prevents other elements from being destroyed in a chain manner when a circuit element is destroyed.

従来、整流回路の直流接続端に接続された平滑コンデンサの破壊防止として、コンデンサ両端電圧を検出し、所定の電圧値を超えた場合に整流回路の入力側に設けられたリレーを開放し、過電圧印加を防止する構成が広く知られている（例えば、特許文献１の実施の形態１を参照）。   Conventionally, to prevent the breakdown of the smoothing capacitor connected to the DC connection end of the rectifier circuit, the voltage across the capacitor is detected, and when the specified voltage value is exceeded, the relay provided on the input side of the rectifier circuit is opened, and the overvoltage A configuration for preventing application is widely known (see, for example, Embodiment 1 of Patent Document 1).

以下、図面を参照しながら従来の保護回路について説明する。図２は特許文献１に記載されている保護回路の構成図である。図２において１は交流電源であり、リレー１９、および力率改善用のリアクタ８を介してダイオード２〜５から成る整流回路６の交流入力端に接続される。整流回路６の直流出力端には平滑コンデンサ７および負荷１１が並列に接続され、電圧検出手段１１により検出された直流電圧は、比較器１８により所定の過電圧設定値と比較され、過電圧と判定されるとリレー１９を開放し、平滑コンデンサ７への過電圧印加を防止する。   Hereinafter, a conventional protection circuit will be described with reference to the drawings. FIG. 2 is a configuration diagram of a protection circuit described in Patent Document 1. In FIG. In FIG. 2, reference numeral 1 denotes an AC power source, which is connected to an AC input terminal of a rectifier circuit 6 including diodes 2 to 5 through a relay 19 and a power factor improving reactor 8. A smoothing capacitor 7 and a load 11 are connected in parallel to the DC output terminal of the rectifier circuit 6, and the DC voltage detected by the voltage detection means 11 is compared with a predetermined overvoltage set value by a comparator 18 and is determined to be an overvoltage. Then, the relay 19 is opened, and overvoltage application to the smoothing capacitor 7 is prevented.

一方、交流電源１の電圧が高く、平滑コンデンサ７の定格電圧を上げる必要が生じる場合に、図３に示すように平滑コンデンサ７ａ、７ｂを二段の直列接続とする場合がある。例えば線間電圧４００Ｖ系統の交流電源の場合、整流回路の直流出力端の電圧はおよそ５７０Ｖとなるため、平滑コンデンサとしてプリント基板に搭載して用いられる一般的な電解コンデンサの定格電圧４５０Ｖを上回るため、３３０Ｖ定格などの電解コンデンサを直列２段接続にして、平滑コンデンサを構成する。   On the other hand, when the voltage of the AC power supply 1 is high and the rated voltage of the smoothing capacitor 7 needs to be increased, the smoothing capacitors 7a and 7b may be connected in two stages in series as shown in FIG. For example, in the case of an AC power supply with a line voltage of 400V, the voltage at the DC output terminal of the rectifier circuit is approximately 570V, which exceeds the rated voltage 450V of a general electrolytic capacitor used as a smoothing capacitor mounted on a printed circuit board. , 330V rated electrolytic capacitors are connected in two stages in series to form a smoothing capacitor.

このような場合に平滑コンデンサの破壊防止手段として、従来と同一構成を適用した場合、平滑コンデンサ７ａ、７ｂそれぞれに電圧検出手段１５ａ、１５ｂを接続し、所定の電圧値を超えた場合に制御装置１４から出力されるリレー１９の駆動信号を遮断することで、平滑コンデンサ７ａ、７ｂの過電圧破壊を防止することが可能である。   In such a case, when the same configuration as the conventional one is applied as the smoothing capacitor destruction preventing means, the voltage detecting means 15a and 15b are connected to the smoothing capacitors 7a and 7b, respectively, and the control device when the predetermined voltage value is exceeded. By shutting off the drive signal of the relay 19 output from 14, it is possible to prevent the overvoltage breakdown of the smoothing capacitors 7a and 7b.

特開２００６−２１７６７５号公報JP 2006-217675 A

しかしながら前記従来の構成では、電圧検出手段が二回路必要になる上、高電位側、すなわち平滑コンデンサ７ａ側の両端電圧を検出する電圧検出手段は、基準電位が低電位側、すなわち平滑コンデンサ７ｂの正極側と同電位となるため、電圧検出手段１５ａおよび１５ｂ間は絶縁処理を行う必要があり、回路構成が複雑になるとともに、回路部品のコストアップを招き、かつ実装面積の増大を招くことになる。   However, the conventional configuration requires two voltage detection means, and the voltage detection means for detecting the voltage across the high potential side, that is, the smoothing capacitor 7a side, has a reference potential of the low potential side, that is, the smoothing capacitor 7b. Since it has the same potential as the positive electrode side, it is necessary to insulate between the voltage detection means 15a and 15b, which complicates the circuit configuration, increases the cost of circuit components, and increases the mounting area. Become.

また、従来同様に図４に示すように整流回路６の直流出力端の電圧検出を行うことで、電源電圧１の電圧上昇に伴う平滑コンデンサ７ａ、７ｂへの過電圧印加は防止可能であるが、コンデンサ７ａ、７ｂのいずれか一方が短絡破壊を生じた場合、残りの一方に全ての電圧が印加されるため、過電圧による破壊を生じることになり、いわゆる連鎖破壊が生じるという課題を有していた。   In addition, by detecting the voltage at the DC output terminal of the rectifier circuit 6 as shown in FIG. 4 as in the prior art, it is possible to prevent overvoltage application to the smoothing capacitors 7a and 7b as the power supply voltage 1 rises. When either one of the capacitors 7a and 7b causes a short-circuit breakdown, all the voltages are applied to the other one, which causes a breakdown due to an overvoltage and has a problem that a so-called chain breakdown occurs. .

本発明は、前記従来の課題を解決するものであり、電圧検出回路の追加を必要とせず、かつ、直列接続されたいずれか一方のコンデンサに短絡破壊が生じた場合においても、他方のコンデンサを過電圧破壊させることなく保護することのできる、過電圧保護回路を提供することを目的とする。   The present invention solves the above-described conventional problem, does not require the addition of a voltage detection circuit, and even when one of the capacitors connected in series is short-circuited, the other capacitor is connected. An object of the present invention is to provide an overvoltage protection circuit capable of protecting without overvoltage destruction.

前記従来の課題を解決するために、本発明の過電圧保護回路は、直列接続された平滑コンデンサの低電位側のコンデンサの両端電圧を電圧検出手段により検出し、第一の基準電圧を上回る場合、あるいは第二の基準電圧を下回る場合に、交流電源と整流回路間に設けられたリレーを開放することにより、高電位側のコンデンサが短絡故障した場合には低電位側のコンデンサで過電圧検出を行い、低電位側のコンデンサが短絡破壊した場合には、短絡破壊自体を検出することで、高電位側のコンデンサに過電圧が印加されることを帽子することが可能となり、いずれか一方のコンデンサが短絡破壊した場合において、他方のコンデンサの過電圧破壊を防止することが可能になる。   In order to solve the conventional problem, the overvoltage protection circuit of the present invention detects the voltage across the capacitor on the low potential side of the smoothing capacitor connected in series by the voltage detection means, and exceeds the first reference voltage, Alternatively, when the voltage falls below the second reference voltage, the relay provided between the AC power supply and the rectifier circuit is opened, so that if the capacitor on the high potential side is short-circuited, overvoltage detection is performed with the capacitor on the low potential side. When a capacitor on the low potential side breaks short-circuited, it is possible to prevent overvoltage from being applied to the capacitor on the high-potential side by detecting the short-circuit breakdown itself, and either capacitor short-circuits. In the case of breakdown, overvoltage breakdown of the other capacitor can be prevented.

また、低電位側のコンデンサに印加される電圧は、高電位側のコンデンサの容量との比率で一義的に決まるため、交流電源１の異常上昇による平滑コンデンサへの過電圧印加についても、従来と同様に検出することが可能になり、過電圧による平滑コンデンサの破壊を防止可能である。   Further, since the voltage applied to the capacitor on the low potential side is uniquely determined by the ratio with the capacitance of the capacitor on the high potential side, overvoltage application to the smoothing capacitor due to an abnormal rise in the AC power supply 1 is the same as in the conventional case. Therefore, it is possible to prevent damage to the smoothing capacitor due to overvoltage.

本発明の過電圧保護回路は、直列接続された平滑コンデンサの低電位側のコンデンサの両端電圧を検出する電圧検出手段を設け、検出された電圧が第一の基準電圧を上回る場合、および第二の基準電圧を下回る場合に、交流電源と整流回路間に設けられたリレーを開放とすることにより、低電位側コンデンサの過電圧と、低電位側コンデンサの短絡破壊を一つの電圧検出手段で検出することが可能になるため、高電位側コンデンサ、低電位側コンデンサのいずれか一方が短絡故障した場合においても、他方のコンデンサへの過電圧印加を防止することが可能となる。   The overvoltage protection circuit of the present invention is provided with voltage detection means for detecting the voltage across the capacitor on the low potential side of the smoothing capacitors connected in series, and when the detected voltage exceeds the first reference voltage, and the second When the voltage is lower than the reference voltage, open the relay provided between the AC power supply and the rectifier circuit to detect the overvoltage of the low-potential side capacitor and the short-circuit breakdown of the low-potential side capacitor with a single voltage detection means. Therefore, even when one of the high-potential side capacitor and the low-potential side capacitor is short-circuited, it is possible to prevent application of overvoltage to the other capacitor.

本発明の実施の形態１における過電圧保護回路の回路構成図1 is a circuit configuration diagram of an overvoltage protection circuit according to Embodiment 1 of the present invention. 従来の過電圧保護回路の回路構成図Circuit diagram of conventional overvoltage protection circuit 従来のインバータ装置の回路構成図Circuit diagram of conventional inverter device 従来のインバータ装置の電圧検出部の他の回路構成図The other circuit block diagram of the voltage detection part of the conventional inverter apparatus

本発明は、交流電源と整流回路の交流入力端間に、充電リレーと限流抵抗からなる突入電流抑制回路を設けるとともに突入電流抑制回路と並列にリレーを設け、整流回路の直流出力端に、コンデンサの二段直列接続からなる平滑コンデンサを接続し、直列接続されたコンデンサの低電位側のコンデンサの両端電圧を検出する電圧検出手段を設け、電圧検出手段による検出電圧を、第一の基準電圧および、第二の基準電圧と比較する第一の比較器および、第二の比較器に入力し、第一の基準電圧を上回る場合、もしくは第二の基準電圧を下回る場合には、制御装置から出力されるリレー出力信号を遮断しリレーを開放することを特徴とした過電圧保護回路であり、直列接続されたコンデンサのいずれか一方が破壊した場合において他方のコンデンサへの過電圧印加を防止することが可能になる。   The present invention provides an inrush current suppression circuit comprising a charging relay and a current limiting resistor between the AC power supply and the AC input end of the rectifier circuit, and a relay in parallel with the inrush current suppression circuit, and at the DC output end of the rectifier circuit, Connect a smoothing capacitor consisting of a two-stage series connection of capacitors, and provide voltage detection means for detecting the voltage across the capacitor on the low potential side of the series connected capacitors. The voltage detected by the voltage detection means is used as the first reference voltage. And input to the first comparator and the second comparator to be compared with the second reference voltage, and when exceeding the first reference voltage or below the second reference voltage, from the control device An overvoltage protection circuit that cuts off the output relay output signal and opens the relay. When one of the capacitors connected in series is destroyed, the other It is possible to prevent the overvoltage of the service.

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。なお、この実施の形態によって本発明が限定されるものではない。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

（実施の形態１）
図１は、本発明における過電圧保護回路の構成の一実施例を示す。 (Embodiment 1)
FIG. 1 shows an embodiment of the configuration of an overvoltage protection circuit according to the present invention.

図１において、１は交流電源、６は整流回路、９はノーマルオープン型の充電リレー９ａと限流抵抗９ｂからなる突入電流抑制回路であり、交流電源１と整流回路６の交流入力端間に接続される。１９はノーマルオープン型のリレーであり、突入電流抑制回路９に並列に接続され、制御装置１４からの駆動信号によって駆動することで閉状態となる。   In FIG. 1, 1 is an AC power source, 6 is a rectifier circuit, 9 is an inrush current suppression circuit comprising a normally open charging relay 9a and a current limiting resistor 9b, and between the AC power source 1 and the AC input terminal of the rectifier circuit 6. Connected. Reference numeral 19 denotes a normally open relay, which is connected in parallel to the inrush current suppression circuit 9 and is closed by being driven by a drive signal from the control device 14.

７ａ、７ｂはコンデンサであり、整流回路６の直流出力端に直列接続されて平滑回路を構成するとともに、並列に接続された負荷１１に電力を供給する。電圧検出手段１５は低電位側のコンデンサ７ｂに並列に接続され、検出された電圧出力は第一の比較器１８ａの反転入力と第二の比較器１８ｂの非反転入力に入力される。一方、第一の比較器１８ａの非反転入力には第一の基準電圧１７ａが、第二の比較器１８ｂの反転入力には第二の基準電圧１７ｂが入力され、第一の比較器１８ａの出力と第二の比較器１８ｂの出力はＯＲ接続され、制御装置１４から出力されるリレー１９の駆動信号に対して、ＡＮＤ接続される。すなわち、第一の比較器１８ａおよび第二の比較器１８ｂからの出力信号は、制御装置１４からのリレー１９駆動信号に対して、動作許可を与える働きを持つことになる。   Reference numerals 7a and 7b denote capacitors, which are connected in series to the DC output terminal of the rectifier circuit 6 to form a smoothing circuit and supply power to a load 11 connected in parallel. The voltage detecting means 15 is connected in parallel to the low potential side capacitor 7b, and the detected voltage output is input to the inverting input of the first comparator 18a and the non-inverting input of the second comparator 18b. On the other hand, the first reference voltage 17a is input to the non-inverting input of the first comparator 18a, and the second reference voltage 17b is input to the inverting input of the second comparator 18b. The output and the output of the second comparator 18 b are OR-connected, and are AND-connected to the drive signal of the relay 19 output from the control device 14. That is, the output signals from the first comparator 18 a and the second comparator 18 b have a function of giving an operation permission to the relay 19 drive signal from the control device 14.

以上の構成において、第一の基準電圧１７ａは第二の基準電圧１７ｂより高く設定されており、電圧検出手段１５による検出電圧が第一の基準電圧１７ａを上回る場合、あるいは検出電圧が第二の基準電圧１７ｂを下回る場合には、制御装置１４からのリレー１９駆動信号は遮断されて、リレー１９は開放となる。   In the above configuration, the first reference voltage 17a is set higher than the second reference voltage 17b, and when the detection voltage by the voltage detection means 15 exceeds the first reference voltage 17a, or the detection voltage is the second reference voltage 17a. When the voltage is lower than the reference voltage 17b, the relay 19 drive signal from the control device 14 is cut off, and the relay 19 is opened.

また、突入電流抑制回路９は、制御装置１４が充電リレー９ａの駆動信号を与えることによって、充電リレー９ａがオンとなり平滑コンデンサ７ａ、７ｂが充電される。この後にリレー１９がオンとなり、負荷１１への供給電流はリレー１９を通ることになるため、充電リレー９ａはオフとなる。   Further, in the inrush current suppression circuit 9, when the control device 14 gives a drive signal for the charging relay 9a, the charging relay 9a is turned on and the smoothing capacitors 7a and 7b are charged. Thereafter, the relay 19 is turned on, and the supply current to the load 11 passes through the relay 19, so that the charging relay 9a is turned off.

以上の構成において、平滑コンデンサ７ａが短絡故障した場合においては、整流回路６の直流出力端の電圧は、平滑コンデンサ７ｂに全て印加されることになるため、第一の基準電圧１７ａをこの電圧に設定しておくことで、電圧検出手段１５、比較器１８ａからなる回路でリレー１９の駆動信号を遮断することができ、平滑コンデンサ７ｂの過電圧破壊を防止することが可能になる。   In the above configuration, when the smoothing capacitor 7a has a short circuit failure, the voltage at the DC output terminal of the rectifier circuit 6 is all applied to the smoothing capacitor 7b, so the first reference voltage 17a is set to this voltage. By setting, the drive signal of the relay 19 can be cut off by a circuit including the voltage detection means 15 and the comparator 18a, and the overvoltage breakdown of the smoothing capacitor 7b can be prevented.

また、平滑コンデンサ７ｂが短絡故障した場合においては、電圧検出手段１５の検出電圧は略０Ｖとなるため、第二の基準電圧１７ｂを０Ｖ付近に設定することで、電圧検出手段１５、第二の比較器１８ｂからなる回路でリレー１９の駆動信号を遮断することができ、平滑コンデンサ７ａの過電圧破壊を防止することが可能になる。   In addition, when the smoothing capacitor 7b is short-circuited, the detection voltage of the voltage detection means 15 is substantially 0V. Therefore, the voltage detection means 15 and the second detection voltage are set by setting the second reference voltage 17b near 0V. The drive signal for the relay 19 can be cut off by a circuit comprising the comparator 18b, and overvoltage breakdown of the smoothing capacitor 7a can be prevented.

なお、第一の基準電圧１７ａ、第二の基準電圧１７ｂを、それぞれ定格電圧、略０Ｖから余裕度を持って設定しても同様の効果を得ることが可能である。   The same effect can be obtained even if the first reference voltage 17a and the second reference voltage 17b are set with a margin from the rated voltage, approximately 0V, respectively.

また、平滑コンデンサ７ａ、７ｂへの充電時には、突入電流抑制回路９の故障により平滑コンデンサ７ａ、７ｂが充電されない場合が考えられるが、この場合においても電圧検出手段１５の出力電圧は略０Ｖとなるため、リレー１９の駆動信号は遮断され、リレー１９がオンすることはできなくなる。これにより、本発明の過電圧保護回路は、突入電流抑制回路９の故障検知を兼用することが可能である。   In addition, when charging the smoothing capacitors 7a and 7b, the smoothing capacitors 7a and 7b may not be charged due to a failure of the inrush current suppression circuit 9. Even in this case, the output voltage of the voltage detection means 15 is approximately 0V. Therefore, the drive signal of the relay 19 is cut off, and the relay 19 cannot be turned on. As a result, the overvoltage protection circuit of the present invention can also be used for failure detection of the inrush current suppression circuit 9.

以上のように、本発明にかかる過電圧保護回路は、平滑コンデンサにコンデンサを直列
接続した構成を用いても電圧検出手段の増加を必要とせずに、いずれか一方のコンデンサに短絡破壊が生じても、他方のコンデンサへの過電圧印加を防止することが可能になり、コンデンサの異常が生じた場合において、部品の連鎖破壊を防止することが可能となるので、３００Ｖクラス超の高電圧の交流電源を用いる電源回路／装置の小型化に適する。 As described above, the overvoltage protection circuit according to the present invention uses a configuration in which a capacitor is connected in series to a smoothing capacitor, and even if a short-circuit breakdown occurs in any one of the capacitors without requiring an increase in voltage detection means. It is possible to prevent overvoltage from being applied to the other capacitor, and in the event of an abnormality in the capacitor, it is possible to prevent chain breakage of components. Suitable for miniaturization of power supply circuit / device to be used.

１ 交流電源
２〜５ ダイオード
６ 整流回路
７ａ、７ｂ 平滑コンデンサ
９ 突入電流抑制回路
９ａ 充電リレー
９ｂ 限流抵抗
１１ 負荷
１４ 制御装置
１５ 電圧検出手段
１７ａ 第一の基準電圧
１７ｂ 第二の基準電圧
１８ａ 第一の比較器
１８ｂ 第二の比較器
１９ リレー DESCRIPTION OF SYMBOLS 1 AC power supply 2-5 Diode 6 Rectifier circuit 7a, 7b Smoothing capacitor 9 Inrush current suppression circuit 9a Charging relay 9b Current limiting resistor 11 Load 14 Control device 15 Voltage detection means 17a First reference voltage 17b Second reference voltage 18a First One comparator 18b Second comparator 19 Relay

Claims (1)

交流電源と、前記交流電源から第一の開閉手段を介して交流入力端に接続される整流回路と、第二の開閉手段と電流抑制素子が直流接続されて成る突入電流抑制手段と、前記整流回路の直流接続端に直列二段接続される平滑コンデンサと、前記整流回路の直流接続端に接続され電力供給される負荷と、前記平滑コンデンサの低電位側の電圧を検出する電圧検出手段と、前記電圧検出手段の検出出力を入力とし、第一の基準電圧と比較する第一の比較手段と、同様に第二の基準電圧と比較する第二の比較手段と、前記第一の開閉手段を駆動する制御回路とを有し、前記第一の基準電圧が前記第二の基準電圧より高く設定され、前記電圧検出手段の出力が前記第一の基準電圧を上回る、あるいは前記第二の基準電圧を下回る場合には、前記第一の開閉手段を開放とすることを特徴とした、過電圧保護回路。 An AC power source, a rectifier circuit connected to an AC input terminal from the AC power source through a first switching means, an inrush current suppression means in which a second switching means and a current suppression element are DC-connected, and the rectification A smoothing capacitor connected in series in two stages to the DC connection end of the circuit; a load connected to the DC connection end of the rectifier circuit; and a voltage detection means for detecting a voltage on the low potential side of the smoothing capacitor; First detection means for comparing the detection output of the voltage detection means with a first reference voltage, second comparison means for comparing with a second reference voltage, and the first switching means. A control circuit for driving, wherein the first reference voltage is set higher than the second reference voltage, and the output of the voltage detection means exceeds the first reference voltage, or the second reference voltage Less than the first And characterized in that the opening in the closed section, the overvoltage protection circuit.
JP2009216650A 2009-09-18 2009-09-18 Overvoltage protection circuit Pending JP2011067037A (en)

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Cited By (8)

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JP2013128342A (en) * 2011-12-16 2013-06-27 Canon Inc Protection circuit, power supply having protection circuit, and image forming apparatus
GB2508394A (en) * 2012-11-30 2014-06-04 Control Tech Ltd Over-voltage protection for a soft start module with smoothing capacitance
CN105048403A (en) * 2015-05-25 2015-11-11 长城电器集团有限公司 Overvoltage protection circuit for AC voltage stabilizer controller
WO2016092789A1 (en) * 2014-12-11 2016-06-16 株式会社デンソー Fault detection circuit
JP2019146348A (en) * 2018-02-20 2019-08-29 ファナック株式会社 Motor drive device having short-circuit judging portion for capacitor of dc link portion
WO2020025585A1 (en) * 2018-07-30 2020-02-06 Fronius International Gmbh Inverter having dc link protection
CN110912398A (en) * 2018-09-18 2020-03-24 台达电子工业股份有限公司 Power conversion system with abnormal energy protection and operation method thereof
CN111130089A (en) * 2020-01-07 2020-05-08 惠州拓邦电气技术有限公司 Switching power supply device

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013128342A (en) * 2011-12-16 2013-06-27 Canon Inc Protection circuit, power supply having protection circuit, and image forming apparatus
US9343972B2 (en) 2011-12-16 2016-05-17 Canon Kabushiki Kaisha Power supply switching rectification method according to input alternating voltage, and image forming apparatus having the same
GB2508394A (en) * 2012-11-30 2014-06-04 Control Tech Ltd Over-voltage protection for a soft start module with smoothing capacitance
WO2016092789A1 (en) * 2014-12-11 2016-06-16 株式会社デンソー Fault detection circuit
CN105048403A (en) * 2015-05-25 2015-11-11 长城电器集团有限公司 Overvoltage protection circuit for AC voltage stabilizer controller
CN105048403B (en) * 2015-05-25 2019-01-01 浙江凯发电气有限公司 A kind of AC voltage regulator controller overvoltage crowbar
JP2019146348A (en) * 2018-02-20 2019-08-29 ファナック株式会社 Motor drive device having short-circuit judging portion for capacitor of dc link portion
US10651758B2 (en) 2018-02-20 2020-05-12 Fanuc Corporation Motor drive apparatus including short-circuit judgment unit for capacitor of DC link unit
WO2020025585A1 (en) * 2018-07-30 2020-02-06 Fronius International Gmbh Inverter having dc link protection
CN112514226A (en) * 2018-07-30 2021-03-16 弗罗纽斯国际有限公司 Inverter with intermediate circuit protection
US11626792B2 (en) 2018-07-30 2023-04-11 Fronius International Gmbh Inverter with monitoring unit for intermediate circuit protection
CN110912398A (en) * 2018-09-18 2020-03-24 台达电子工业股份有限公司 Power conversion system with abnormal energy protection and operation method thereof
CN110912398B (en) * 2018-09-18 2021-09-28 台达电子工业股份有限公司 Power conversion system with abnormal energy protection and operation method thereof
CN111130089A (en) * 2020-01-07 2020-05-08 惠州拓邦电气技术有限公司 Switching power supply device

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