JP5351062B2 - Circuit breaker - Google Patents

Circuit breaker Download PDF

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JP5351062B2
JP5351062B2 JP2010004957A JP2010004957A JP5351062B2 JP 5351062 B2 JP5351062 B2 JP 5351062B2 JP 2010004957 A JP2010004957 A JP 2010004957A JP 2010004957 A JP2010004957 A JP 2010004957A JP 5351062 B2 JP5351062 B2 JP 5351062B2
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voltage
switching means
current
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JP2011146196A (en
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敏光 野村
晴彦 山崎
龍幸 塚本
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Mitsubishi Electric Corp
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Description

この発明は、交流電路に過電流が流れたときにその電路を遮断する回路遮断器に関するものである。   The present invention relates to a circuit breaker that interrupts an electric circuit when an overcurrent flows through the AC circuit.

従来の回路遮断器は、交流電路の電流を検出する変流器の２次側に接続された整流回路と、この整流回路の直流側間に接続された第１の開閉器と、この第１の開閉器と並列に接続され、充電電圧を回路遮断器の引外しコイル（トッリプコイル）の励磁電圧とする平滑コンデンサ、この平滑コンデンサと並列に接続され、平滑コンデンサの電圧が所定値より大きくなれば第１の開閉器の閉路期間の割合が増えるように第１の開閉器を制御する制御信号を出力するパルスデューティ変調器及びこのパルスデューティ変調器出力を短絡制御する第２の開閉器を含む制御電源と、交流電路に流れる電流が過電流状態により遮断する時は第２の開閉器を短時間短絡するワンパルス発生回路とを備え、回路遮断器の引外しコイルに印加される励磁電圧を短時間高め、回路遮断器の遮断動作を早めるように構成している。（例えば、特許文献１、図１参照）   A conventional circuit breaker includes a rectifier circuit connected to the secondary side of a current transformer that detects a current in an AC circuit, a first switch connected between the DC sides of the rectifier circuit, and the first switch A smoothing capacitor that is connected in parallel with the switch and uses the charging voltage as the excitation voltage of the trip coil of the circuit breaker, and is connected in parallel with the smoothing capacitor so that the voltage of the smoothing capacitor exceeds a predetermined value. A control including a pulse duty modulator that outputs a control signal for controlling the first switch so that a ratio of a closing period of the first switch is increased, and a second switch that performs short-circuit control on the output of the pulse duty modulator. A power supply and a one-pulse generation circuit that short-circuits the second switch for a short period of time when the current flowing in the AC circuit is interrupted due to an overcurrent condition, and shortens the excitation voltage applied to the trip coil of the circuit breaker. Increased during, and configured to accelerate the breaking operation of the circuit breaker. (For example, see Patent Document 1 and FIG. 1)

特開平６−６０７９１号公報JP-A-6-60791

従来の回路遮断器は以上のように構成されているが、交流電路において変流器の一次側に流れる電流が短絡電流のように非常に大きな場合、変流器の二次側に流れる出力電流の波形に歪が生じ、引外しコイルに必要な電圧を供給することができないという問題があった。   The conventional circuit breaker is configured as described above. However, if the current flowing to the primary side of the current transformer in the AC circuit is very large, such as a short circuit current, the output current flowing to the secondary side of the current transformer There is a problem in that the waveform of the above is distorted and the voltage necessary for the tripping coil cannot be supplied.

この発明は、前記のような課題を解決するためになされたもので、短絡電流のように非常に大きな電流が交流電路に流れた場合でも、引外しコイルに必要な電圧を供給し確実に動作することができる回路遮断器を提供することを目的とするものである。   The present invention has been made to solve the above-described problems, and even when a very large current such as a short-circuit current flows in the AC circuit, it supplies the necessary voltage to the trip coil and operates reliably. An object of the present invention is to provide a circuit breaker that can be used.

この発明に係る回路遮断器は、交流電路に流れる電流を変流器で検出し、その検出電流に基づいて引外しコイル制御手段により引外しコイルを動作させ前記交流電路を開閉装置で遮断する回路遮断器において、前記変流器の２次側に接続され前記検出電流を整流する整流回路と、この整流回路の出力側に接続され、前記検出電流に基づく出力電圧を出力する検出抵抗と、前記整流回路の出力側に並列接続され、前記整流回路の出力端を開閉する第一のスイッチング手段と、前記整流回路から出力された電圧が所定の値より大きくなったときに、前記第一のスイッチング手段の閉時間の割合が増えるように前記第一のスイッチング手段を制御する制御信号を出力する電源制御手段と、前記整流回路の出力側に並列接続され、前記引外しコイルに電力を供給するコイル供給電源生成回路と、このコイル供給電源生成回路の出力電圧が前記引外しコイルの駆動可能電圧値に達したときに出力信号を出力する電圧検出回路と、前記検出抵抗の出力電圧に基づいて前記交流電路に流れる電流の大きさに対応した時限で出力信号を出力する時限回路と、この時限回路の出力信号により前記第一のスイッチング手段を強制的に開にする第二のスイッチング手段と、前記時限回路と前記電圧検出回路の出力信号の論理積信号を前記引外しコイル制御手段に出力するＡＮＤ回路とを備えたものである。   A circuit breaker according to the present invention is a circuit that detects a current flowing in an AC circuit with a current transformer, operates a trip coil by a trip coil control means based on the detected current, and interrupts the AC circuit with a switchgear. In the circuit breaker, a rectifier circuit connected to the secondary side of the current transformer for rectifying the detected current, a detection resistor connected to the output side of the rectifier circuit and outputting an output voltage based on the detected current, A first switching means connected in parallel to the output side of the rectifier circuit, for opening and closing the output end of the rectifier circuit; and when the voltage output from the rectifier circuit exceeds a predetermined value, the first switching means Power supply control means for outputting a control signal for controlling the first switching means so as to increase the closing time ratio of the means, and connected in parallel to the output side of the rectifier circuit, to the trip coil A coil supply power generation circuit for supplying power, a voltage detection circuit for outputting an output signal when an output voltage of the coil supply power generation circuit reaches a driveable voltage value of the trip coil, and an output of the detection resistor A timing circuit that outputs an output signal in a time period corresponding to the magnitude of the current flowing in the AC circuit based on a voltage, and a second circuit that forcibly opens the first switching means by the output signal of the time circuit. It comprises switching means, and an AND circuit for outputting a logical product signal of output signals of the time limit circuit and the voltage detection circuit to the trip coil control means.

この発明係わる回路遮断器は、時限回路と電圧検出回路の出力信号をＡＮＤさせて引外しコイルを駆動するようにしたので、短絡電流のように非常に大きな電流が交流電路に流れた場合でも、トリップコイルに必要な電圧を供給し確実に動作することができる。   In the circuit breaker according to the present invention, the output signal of the time limit circuit and the voltage detection circuit is ANDed to drive the trip coil, so even when a very large current such as a short circuit current flows in the AC circuit, A necessary voltage can be supplied to the trip coil to reliably operate.

この発明の実施の形態１における回路遮断器を示すブロック回路図である。It is a block circuit diagram which shows the circuit breaker in Embodiment 1 of this invention. 実施の形態１の動作を説明するためのタイムチャートである。3 is a time chart for explaining the operation of the first embodiment.

実施の形態１．
図１は、この発明の実施の形態１における回路遮断器を示すブロック回路図である。
図において、交流電路１には、回路遮断器１００を構成し、交流電路１に流れる電流を開閉するための開閉装置２、及び交流電路１に流れる電流を検出するための変流器３が配設されており、開閉装置２は交流電路１に過電流が流れると引外しコイル４の作動により開路される。
変流器３の２次側にはその検出電流を整流する整流回路６が接続されており、整流回路６の出力側には変流器３で検出した検出電流に基づく出力電圧を出力する検出抵抗７、電源平滑用コンデンサ２０、整流回路６の出力端を開閉する第一のスイッチング手段８、及びこの第一のスイッチング手段８を後述する時限回路の出力信号により強制的に開にするための第二のスイッチング手段１４が配設されている。 Embodiment 1 FIG.
1 is a block circuit diagram showing a circuit breaker according to Embodiment 1 of the present invention.
In the figure, an AC circuit 1 is provided with a circuit breaker 100, a switching device 2 for opening and closing a current flowing in the AC circuit 1, and a current transformer 3 for detecting a current flowing in the AC circuit 1. The switchgear 2 is opened by the operation of the trip coil 4 when an overcurrent flows in the AC circuit 1.
A rectifier circuit 6 that rectifies the detected current is connected to the secondary side of the current transformer 3, and a detection that outputs an output voltage based on the detected current detected by the current transformer 3 is output to the output side of the rectifier circuit 6. Resistor 7, power source smoothing capacitor 20, first switching means 8 for opening and closing the output terminal of rectifier circuit 6, and the first switching means 8 for forcibly opening the output by an output signal of a timed circuit to be described later Second switching means 14 is provided.

また、整流回路６の出力側には整流回路６から出力された電圧が所定の値より大きくなったときにスイッチング手段８の閉時間の割合が増えるように第一のスイッチング手段８を制御する制御信号を出力する電源制御手段９、引外しコイル４に電力を供給するコイル供給電源生成回路１０、引外しコイル４の駆動可能電圧値を記憶すると共に入力されたコイル供給電源生成回路１０の電圧が引外しコイル４の駆動可能電圧値に達したときに出力信号を出力する電圧検出回路１１、検出抵抗７が発生した出力電圧に基づいて交流電路１に流れる電流の大きさに対応した時限で出力信号を出力する時限回路１２、時限回路１２と電圧検出回路１１の出力信号の論理積を出力するＡＮＤ回路１３、及びＡＮＤ回路１３の出力信号により引外しコイル４を制御する引外しコイル制御手段５が配設されている。   Further, on the output side of the rectifier circuit 6, a control for controlling the first switching means 8 so that the ratio of the closing time of the switching means 8 increases when the voltage output from the rectifier circuit 6 becomes larger than a predetermined value. A power supply control means 9 for outputting a signal, a coil supply power generation circuit 10 for supplying power to the trip coil 4, a drivable voltage value for the trip coil 4 is stored, and the input voltage of the coil supply power generation circuit 10 is inputted. A voltage detection circuit 11 for outputting an output signal when the driveable voltage value of the trip coil 4 is reached, and a time limit corresponding to the magnitude of the current flowing in the AC circuit 1 based on the output voltage generated by the detection resistor 7 A time limit circuit 12 for outputting a signal, an AND circuit 13 for outputting a logical product of output signals of the time limit circuit 12 and the voltage detection circuit 11, and a trip coil by an output signal of the AND circuit 13 Is arranged is releasing coil control means 5 for controlling.

また、電源制御手段９は、コイル供給電源生成回路１０に並列接続された基準電圧発生回路９ａから出力された所定の電圧Vrefと整流回路６から出力された出力電圧とを比較し、出力電圧が所定の電圧Vrefを超えている期間に応じたパルス幅のパルス列信号をトランジスタからなる第一のスイッチング手段８のベースに出力するパルスデューティ変調器９ｂから形成されている。
また、コイル供給電源生成回路１０は、電圧検出回路１１へ電圧を出力する第三のスイッチング手段１０ａと、時限回路１２の出力電圧に基づいて第三のスイッチング手段１０ａを制御する第四のスイッチング手段１０ｂと、第三のスイッチング手段１０ａから出力された電流を充電するコンデンサからなる充電手段１０ｃにより形成されている。 The power supply control means 9 compares the predetermined voltage Vref output from the reference voltage generation circuit 9a connected in parallel with the coil supply power generation circuit 10 with the output voltage output from the rectifier circuit 6, and the output voltage is The pulse duty modulator 9b outputs a pulse train signal having a pulse width corresponding to a period exceeding a predetermined voltage Vref to the base of the first switching means 8 made of a transistor.
The coil power supply generation circuit 10 includes a third switching unit 10 a that outputs a voltage to the voltage detection circuit 11 and a fourth switching unit that controls the third switching unit 10 a based on the output voltage of the time limit circuit 12. 10b and charging means 10c comprising a capacitor for charging the current output from the third switching means 10a.

次に、以上のように構成されたこの発明の実施の形態１における回路遮断器の動作について図１および図２を用いて説明する。
交流電路１に負荷電流Ｉが流れると、変流器３の２次側に交流の検出電流ｉが流れ（Ｓ０１）、整流回路６によって、この検出電流ｉを整流して直流電流ｉ１に変換（Ｓ０２）する。検出電流ｉが小さい場合、この直流電流ｉ１は、電源平滑コンデンサ２０を充電し、検出抵抗７を流れ整流回路６に帰る。
負荷電流Ｉが大きくなり、それに比例して大きな直流電流ｉ１が電源平滑コンデンサ２
０に流れると電源平滑コンデンサ２０の充電電圧Ｖ０は大きくなり、電源平滑コンデンサ２０の充電電圧Ｖ０の電圧値に基づいて電源制御手段９のパルスデューティ変調器９ｂから第一のスイッチング手段８を開閉する信号が出力されることにより、充電電圧Ｖ０を一定に保持される（Ｓ０３）。 Next, the operation of the circuit breaker according to Embodiment 1 of the present invention configured as described above will be described with reference to FIGS.
When a load current I flows in the AC circuit 1, an AC detection current i flows to the secondary side of the current transformer 3 (S01), and the detection current i is rectified by the rectifier circuit 6 and converted into a DC current i1 ( S02). When the detection current i is small, the DC current i 1 charges the power supply smoothing capacitor 20, flows through the detection resistor 7, and returns to the rectifier circuit 6.
The load current I increases, and a large DC current i1 is proportionally proportional to the power supply smoothing capacitor 2
When flowing to 0, the charging voltage V0 of the power supply smoothing capacitor 20 increases, and the first switching means 8 is opened and closed from the pulse duty modulator 9b of the power supply control means 9 based on the voltage value of the charging voltage V0 of the power supply smoothing capacitor 20. By outputting the signal, the charging voltage V0 is held constant (S03).

交流電路１に流れる負荷電流Ｉが更に大きくなり、それに伴って検出抵抗７に流れる直流電流ｉ１が増加する（Ｓ０４）と、検出抵抗７の両端に発生する検出電圧Ｖ１が上昇し（Ｓ０５）、この電圧上昇を時限回路１２は検出し、所定の時間後に引外しコイル４を動作させるためのトリップ信号出力（ａ）を出力する（Ｓ０６）。このトリップ信号出力信号（ａ）が出力されると第二のスイッチング手段１４が閉状態となり、さらに第一のスイッチング手段８はパルスデューティ変調器９ｂの出力状態に関係なく開状態となる。   When the load current I flowing through the AC circuit 1 further increases and the DC current i1 flowing through the detection resistor 7 increases accordingly (S04), the detection voltage V1 generated at both ends of the detection resistor 7 increases (S05). The time limit circuit 12 detects this voltage rise, and outputs a trip signal output (a) for operating the trip coil 4 after a predetermined time (S06). When this trip signal output signal (a) is output, the second switching means 14 is closed, and the first switching means 8 is open regardless of the output state of the pulse duty modulator 9b.

また、同時に第四のスイッチング手段１０ｂが閉状態となることで、第三のスイッチング手段１０ａが閉状態となる。そのため直流電流ｉ１は電源平滑コンデンサ２０と充電手段１０ｃに流れ続け充電電圧Ｖ２を上昇させる（Ｓ０７）。
充電手段１０ｃに充電された充電電圧Ｖ２を検出する電圧検出回路１１は、引外しコイル４が確実に動作する電圧値であるトリップコイル駆動可能電圧まで上昇するのを検出すると、充電完了信号（ｂ）を出力する（Ｓ０８）。 At the same time, the fourth switching means 10b is closed, so that the third switching means 10a is closed. Therefore, the direct current i1 continues to flow through the power supply smoothing capacitor 20 and the charging means 10c and increases the charging voltage V2 (S07).
When the voltage detection circuit 11 that detects the charging voltage V2 charged in the charging means 10c detects that the trip coil 4 rises to a trip coil driveable voltage that is a voltage value that reliably operates, the charging completion signal (b ) Is output (S08).

トリップ信号出力（ａ）及び充電完了信号（ｂ）が共に出力された状態によって、ＡＮＤ回路１３からトリガ回路入力信号（ｃ）が出力される（Ｓ０９）ことで引外しコイル制御手段５が動作し、引外しコイル４が引外し動作を行ない開閉装置２を動作させる。   When the trip signal output (a) and the charging completion signal (b) are both output, the trigger circuit input signal (c) is output from the AND circuit 13 (S09), and the trip coil control means 5 operates. The tripping coil 4 performs a tripping operation to operate the switchgear 2.

なお、この実施の形態１によれば、例えば定格電流１００Ａの回路遮断器において、交流電路１に10,000Ａの短絡電流が流れた場合、２０Ｖ定格の引外しコイル２に対して３０Ｖを供給することが可能になり、確実に遮断動作を実行することができる。   According to the first embodiment, for example, in a circuit breaker with a rated current of 100 A, when a short-circuit current of 10,000 A flows in the AC circuit 1, 30 V is supplied to the trip coil 2 rated at 20 V. Therefore, the shut-off operation can be executed with certainty.

以上のようにこの発明の実施の形態１によれば、交流電路１に流れる電流を変流器３で検出し、その検出電流に基づいて引外しコイル制御手段５により引外しコイル４を動作させ交流電路を開閉装置２で遮断する回路遮断器において、変流器の２次側に接続され検出電流を整流する整流回路６と、この整流回路の出力側に接続され、検出電流に基く出力電圧を出力する検出抵抗７と、整流回路の出力側に並列接続され、整流回路の出力端を開閉する第一のスイッチング手段８と、整流回路から出力された電圧が所定の値より大きくなったときに、第一のスイッチング手段の閉時間の割合が増えるように第一のスイッチング手段を制御する制御信号を出力する電源制御手段９と、整流回路の出力側に並列接続され、引外しコイルに電力を供給するコイル供給電源生成回路１０と、このコイル供給電源生成回路の出力電圧が引外しコイルの駆動可能電圧値に達したときに出力信号を出力する電圧検出回路１１と、検出抵抗の出力電圧に基づいて交流電路に流れる電流の大きさに対応した時限で出力信号を出力する時限回路１２と、この時限回路の出力信号により第一のスイッチング手段を強制的に開にする第二のスイッチング手段１４と、時限回路と電圧検出回路の出力信号の論理積信号を引外しコイル制御手段に出力するＡＮＤ回路とを備えたので、短絡電流のように非常に大きな電流が交流電路に流れた場合でも、引外しコイルに必要な電圧を供給し確実に動作することができる。   As described above, according to the first embodiment of the present invention, the current flowing through the AC circuit 1 is detected by the current transformer 3, and the trip coil 4 is operated by the trip coil control means 5 based on the detected current. In the circuit breaker that interrupts the AC circuit with the switchgear 2, the rectifier circuit 6 that rectifies the detected current connected to the secondary side of the current transformer, and the output voltage that is connected to the output side of the rectifier circuit and that is based on the detected current Is connected in parallel to the output side of the rectifier circuit, the first switching means 8 that opens and closes the output terminal of the rectifier circuit, and the voltage output from the rectifier circuit becomes greater than a predetermined value In addition, a power supply control means 9 for outputting a control signal for controlling the first switching means so as to increase the ratio of the closing time of the first switching means, and a parallel connection on the output side of the rectifier circuit, the power to the trip coil Supply Based on the coil supply power generation circuit 10, the voltage detection circuit 11 that outputs an output signal when the output voltage of the coil supply power generation circuit reaches the trippable voltage value of the trip coil, and the output voltage of the detection resistor A time circuit 12 for outputting an output signal in a time period corresponding to the magnitude of the current flowing in the AC circuit, a second switching means 14 for forcibly opening the first switching means by the output signal of the time circuit, An AND circuit that trips the logical product signal of the output signal of the time limit circuit and the voltage detection circuit and outputs it to the coil control means, so even if a very large current such as a short circuit current flows in the AC circuit, the trip circuit A necessary voltage can be supplied to the coil to reliably operate.

また、コイル供給電源生成回路１０は電圧検出回路１１へ電圧を出力する第三のスイッチング手段１０ａと、時限回路１２の出力電圧に基づいて第三のスイッチング手段１０ａを制御する第四のスイッチング手段１０ｂと、第三のスイッチング手段１０ａから出力された電流を充電する充電手段１０ｃとで構成されるようにしたのでトリップ検出出力と同時に充電処理を行なうことができ、高速で動作させることができるという効果がある。   The coil power supply generation circuit 10 has a third switching means 10a for outputting a voltage to the voltage detection circuit 11, and a fourth switching means 10b for controlling the third switching means 10a based on the output voltage of the time limit circuit 12. And the charging means 10c for charging the current output from the third switching means 10a, the charging process can be performed simultaneously with the trip detection output, and the operation can be performed at high speed. There is.

１ 交流電路、２ 開閉装置、３ 変流器、４ 引外しコイル、５ 引外しコイル制御手段、６ 整流回路、７ 検出抵抗、８ 第一のスイッチング手段、９ 電源制御手段、９ａ 基準電圧発生回路、９ｂ パルスデューティ変調器、１０ コイル供給電源生成回路、１０ａ 第三のスイッチング手段、１０ｂ 第四のスイッチング手段、１０ｃ 充電手段、１１ 電圧検出回路、１２ 時限回路、１３ ＡＮＤ回路、１４ 第二のスイッチング手段、２０ 電源平滑用コンデンサ、１００ 回路遮断器。   1 AC circuit, 2 switchgear, 3 current transformer, 4 trip coil, 5 trip coil control means, 6 rectifier circuit, 7 detection resistor, 8 first switching means, 9 power supply control means, 9a reference voltage generation circuit , 9b Pulse duty modulator, 10 coil power supply generation circuit, 10a third switching means, 10b fourth switching means, 10c charging means, 11 voltage detection circuit, 12 time limit circuit, 13 AND circuit, 14 second switching Means, 20 power supply smoothing capacitor, 100 circuit breaker.

Claims (3)

交流電路に流れる電流を変流器で検出し、その検出電流に基づいて引外しコイル制御手段により引外しコイルを動作させ前記交流電路を開閉装置で遮断する回路遮断器において、前記変流器の２次側に接続され前記検出電流を整流する整流回路と、
この整流回路の出力側に接続され、前記検出電流に基づく出力電圧を出力する検出抵抗と、前記整流回路の出力側に並列接続され、前記整流回路の出力端を開閉する第一のスイッチング手段と、
前記整流回路から出力された電圧が所定の値より大きくなったときに、前記第一のスイッチング手段の閉時間の割合が増えるように前記第一のスイッチング手段を制御する制御信号を出力する電源制御手段と、
前記整流回路の出力側に並列接続され、前記引外しコイルに電力を供給するコイル供給電源生成回路と、
このコイル供給電源生成回路の出力電圧が前記引外しコイルの駆動可能電圧値に達したときに出力信号を出力する電圧検出回路と、
前記検出抵抗の出力電圧に基づいて前記交流電路に流れる電流の大きさに対応した時限で出力信号を出力する時限回路と、
この時限回路の出力信号により前記第一のスイッチング手段を強制的に開にする第二のスイッチング手段と、
前記時限回路と前記電圧検出回路の出力信号の論理積信号を前記引外しコイル制御手段に出力するＡＮＤ回路とを
備えたことを特徴とする回路遮断器。 In a circuit breaker that detects a current flowing in an AC circuit with a current transformer, operates a trip coil by a trip coil control means based on the detected current, and interrupts the AC circuit with a switchgear. A rectifier circuit connected to the secondary side and rectifying the detection current;
A detection resistor connected to the output side of the rectifier circuit and outputting an output voltage based on the detection current; and a first switching means connected in parallel to the output side of the rectifier circuit to open and close the output terminal of the rectifier circuit; ,
Power supply control for outputting a control signal for controlling the first switching means so that the ratio of the closing time of the first switching means is increased when the voltage output from the rectifier circuit becomes larger than a predetermined value. Means,
A coil supply power generation circuit that is connected in parallel to the output side of the rectifier circuit and supplies power to the tripping coil;
A voltage detection circuit that outputs an output signal when an output voltage of the coil power supply generation circuit reaches a drivable voltage value of the trip coil; and
A timing circuit that outputs an output signal in a time period corresponding to the magnitude of the current flowing in the AC circuit based on the output voltage of the detection resistor;
A second switching means for forcibly opening the first switching means by an output signal of the timing circuit;
A circuit breaker comprising: an AND circuit that outputs a logical product signal of the output signal of the time limit circuit and the voltage detection circuit to the trip coil control means. 前記コイル供給電源生成回路は、
前記電圧検出回路へ電圧を出力する第三のスイッチング手段と、
前記時限回路の出力電圧に基づいて前記第三のスイッチング手段を制御する第四のスイッチング手段と、
前記第三のスイッチング手段から出力された電流を充電する充電手段とを
備えたことを特徴とする請求項１記載の回路遮断器。 The coil power supply generation circuit includes:
Third switching means for outputting a voltage to the voltage detection circuit;
A fourth switching means for controlling the third switching means based on the output voltage of the timing circuit;
2. The circuit breaker according to claim 1, further comprising charging means for charging the current output from the third switching means. 前記電源制御手段は、
前記コイル供給電源生成回路に並列接続された基準電圧発生回路と、
前記整流回路から出力された出力電圧が、前記基準電圧発生回路から出力された所定の電圧を超えている期間に応じたパルス幅のパルス列信号を前記第一のスイッチング手段の制御信号として出力するパルスデューティ変調器とを
備えたことを特徴とする請求項１または２記載の回路遮断器。 The power control means includes
A reference voltage generation circuit connected in parallel to the coil power supply generation circuit;
A pulse for outputting a pulse train signal having a pulse width corresponding to a period in which an output voltage output from the rectifier circuit exceeds a predetermined voltage output from the reference voltage generation circuit as a control signal for the first switching means 3. The circuit breaker according to claim 1, further comprising a duty modulator.
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