JP3335838B2 - Circuit breaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker having an electronic current detection device and a tripping device, and more particularly to an electronic circuit breaker having a circuit configuration in which a part of a detection current is used for an operation power supply of an electronic circuit. It relates to a circuit breaker.

[0002]

2. Description of the Related Art FIG.
FIG. 1 is a circuit configuration diagram of a conventional circuit breaker shown in Japanese Patent Publication No. In the drawing, 10 is a load switching contact, 11 and 12 are AC electric paths, 13 is an electromagnetic coil for driving the load switching contact 10, and 14 is a switching circuit. 21 and 22 are AC circuit 1
Current transformers for detecting currents 1 and 12; 30 for current transformer 21;
This is a rectifier circuit for full-wave rectification of the secondary output of No. 22 and is composed of diodes 31 to 36. The rectifier circuit 30 is configured to obtain a phase current of each of the AC electric circuits 11 and 12 and a combined current. A power supply circuit 37 supplies a reference voltage and a positive input voltage of a differential amplifier, which will be described later, and an operating power of the time limit circuit 90, respectively. Numeral 40 denotes a current detection resistor, which detects a combined current of the AC circuits 11 and 12 as a voltage output across the resistor. Reference numerals 41 and 42 denote phase current detection resistors, which detect the current of each phase as a voltage output across the resistor.
Numerals 60, 62 and 64 are differential amplifier circuits for converting the detection voltages of the current detection resistor 40 and the phase current detection resistors 41 and 42 into signals based on the intermediate potential of the power supply circuit 37. The amplifier 61 is composed of four resistors, the differential amplifier circuit 62 is composed of an operational amplifier 63 and four resistors, and the differential amplifier circuit 64 is composed of an operational amplifier 65 and four resistors.

[0003] Reference numeral 90 denotes a timer circuit, which discriminates the inverted output from the differential amplifying circuit 60, sends an operation signal to the switch circuit 14 when the level exceeds a predetermined level and exceeds the time limit, closes the switch circuit 14, A current is supplied to the load 13 and the load switching contact 10 is opened by the electromagnetic force to cut off the current flowing through the AC power lines 11 and 12. The timed circuit 90 comprises an instantaneous trip circuit 71, a peak value conversion circuit 72, a short time trip circuit 73, a maximum phase selection circuit 74, an effective value conversion circuit 75, and a long time trip circuit 76. A predetermined level and a time limit are determined in correspondence with.

In the conventional circuit breaker configured as described above, the current in the rectifier circuit 30 that accurately corresponds to the current in the AC circuits 11 and 12 is detected by the current detection resistors 40 and the phase current detection resistors 41 and 42. Therefore, it is necessary to connect these resistors 40, 41, and 42 downstream from the ground point G where the current branched to the power supply circuit 37, the time limit circuit 90, and the like are collected.
Therefore, the current detection resistor 40 and the phase current detection resistor 41,
The output voltage of 42 becomes negative with respect to the ground point G.
The operation amplifier circuits 60, 62 and 64 invert and amplify this in order to make this processing into the positive polarity processing by the time limit circuit 90.

[0005]

As described above, the conventional circuit breaker has a current detecting resistor 40 and a phase current detecting resistor 4 as described above.
Since the output voltages 1 and 42 have a negative polarity with respect to the ground point G, an operational amplifier and a resistor for inverting the output voltages to a positive polarity are required, and the circuit configuration is complicated. This also increases the power consumption of the entire circuit and places a heavy burden on the power supply circuit, and furthermore, the input potential of the operational amplifier is limited by the output voltage (+ V) and the output voltage (-V) of the power supply circuit. Therefore, there is a restriction that the input-side resistor Rin and the output-side resistor Rout of each differential amplifier circuit must be set to satisfy this condition.

The present invention has been made in order to solve such a problem, and it is an object of the present invention to provide a circuit breaker which can perform positive polarity processing with a simple circuit configuration, consumes less power, and has a high operation accuracy. is there.

[0007]

SUMMARY OF THE INVENTION A circuit breaker according to the present invention includes a load switching contact which is inserted into an AC circuit and is opened and closed by an electromagnetic coil, a current transformer for detecting the current of the AC circuit, and a current transformer. A rectifier circuit for converting the secondary current of the current transformer into a unidirectional current, and a rectifier circuit connected between output terminals of the rectifier circuit .
A first switching element, a current detection resistor connected in series to the first switching element, a phase current detection resistor for detecting a current of each phase of the AC circuit, and the first switching element. A smoothing capacitor connected in parallel to the series circuit of the current detection resistor, the first switching element and the smoothing capacitor;
A second switching element provided between the capacitor and the capacitor;
Operation power is supplied from the output terminal of the smoothing capacitor.
Control circuit, the control circuit comprising:
Monitor the instantaneous maximum value of the voltage generated by the current flowing to
When this is greater than or equal to a predetermined value, the negative
An instantaneous trip circuit for opening and closing the load contact
Monitors the voltage generated by the current flowing to the detection resistor, and
After timed processing, the load switching contacts via the electromagnetic coil
A time release circuit for separating the first switch and the first switch.
Conduction / non-conduction between the switching element and the second switching element in opposite phases.
And a switching element control means for conducting.
is there.

In the above configuration, the switching element
The voltage control means is a voltage divider connected in parallel with the smoothing capacitor.
Monitor the voltage of the resistor within a predetermined range, and
The first switching element is turned on, and non-conductive at the lower end of the voltage range.
A switching signal generation circuit that generates a signal to make it conductive
Have

Further, in the above configuration, the switching element
The voltage control means controls the voltage of the smoothing capacitor within a predetermined range.
Monitor, rise (fall), voltage at the upper end of the voltage range
Generates a falling (rising) pulse signal at the lower end of the range
The first switching element and the second switching element
Conduction / non-conduction between the two switching elements in opposite phase
It has a switching signal generation circuit.

Further, in the above configuration, the switching element
The second switching element and the second switching element.
Of the predetermined period for conducting / non-conducting with the
Has a switching signal generation circuit that generates pulse signals
Things.

[0011] In the above configuration, the control circuit is a flat circuit.
The voltage of the capacitor is monitored within a predetermined range, and the voltage
Rises (falls) at the upper limit of the voltage, and rises at the lower limit of the voltage range.
Generates a falling (up) pulse signal, and this pulse signal
To switch the first switching element on / off.
Detecting voltage of switching signal generation circuit and current detection resistor
Then, the second switching element is switched to the first switching element by this voltage value.
Instantaneous power that turns on / off in reverse phase with the switching element
And a flow detection circuit.

Further, in the above configuration, the phase current detection resistor
Indicates the current flowing through the current detection resistor and the switching element
Control means, instantaneous trip circuit, timed trip circuit
It is returning to the flow.

Further, in the above configuration, the rectifier circuit is
It has a bypass line connected to one end of the electromagnetic coil.
You.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a circuit configuration diagram showing Embodiment 1 of the present invention, and includes 10 to 14, 21, 22, 30 to 36, and 40 to 42.
Is similar to the conventional device shown in FIG. A smoothing capacitor 50 smoothes the output voltage from the rectifier circuit 30. Reference numeral 51 denotes a first switching element connected in parallel to the rectifier circuit 30 and the smoothing capacitor 50, and switches the current to the smoothing capacitor 50 and the current detection resistor 40 by switching. Reference numeral 55 denotes a Zener diode which prevents the charging voltage of the smoothing capacitor 50 from rising above a predetermined voltage. 52 is a second switching element, which is connected to the rectifier circuit 30 and the smoothing capacitor 5 via transistors 53 and 54.
0 is disconnected. Reference numeral 56 denotes a diode, which is used when the second switching element 52 is turned off.
The charge of the smoothing capacitor 50 is transferred to the second switching element 5
Prevent backflow through 2. 57 is a bypass line that bypasses the second switching element 52 and directly connects the rectifier circuit 30 and the electromagnetic coil 13. 58 is a second Zener diode that protects the first switching element 51 from overvoltage.

Reference numeral 70 denotes a control circuit including an instantaneous trip circuit 77, a timed trip circuit 78, and a switching signal generation circuit 79. The instantaneous trip circuit 77 is connected to the AC circuit 11,
The voltage of the current detection resistor 40, which is proportional to the combined current of the switching circuit 12, is monitored.
An operation signal is sent to The time trip circuit 78 includes a phase current detection resistor 4 that is proportional to the current of each phase of the AC circuits 11 and 12.
By monitoring the voltages of 1 and 42, the maximum phase selection circuit, the peak value conversion circuit of each phase, the short time trip circuit, the maximum phase selection circuit, the effective value conversion circuit, and the long time trip circuit described in the above conventional example. A predetermined level and a predetermined time period are determined in accordance with the respective cut-off time characteristics.
Then, an operation signal is sent to 4. Switching signal generation circuit 7
Reference numeral 9 denotes a pulse voltage having a constant cycle shorter than a half cycle of the AC circuit current. The pulse voltage is generated by using a multivibrator or the clock pulse for the arithmetic processing of the timed trip circuit 78 is divided. As a result, a pulse signal having a predetermined period is obtained.

The operation of the above circuit configuration will be described with reference to FIG. The output current of the rectifier circuit 30 is
, And is made a constant voltage by the Zener diode 55, and becomes an operation power supply of the control circuit 70 (the instantaneous trip circuit 77, the timed trip circuit 78, and the switching signal generation circuit 79). Here, while the pulse-like voltage output from the switching signal generating circuit 79 shown in FIG. 2B is applied to the base of the first switching element 51 by conduction, the output of the rectifier circuit 30 is the first switching element. During the period in which the pulsed voltage output is applied to the base of the first switching element 51 in a non-conductive state, the first switching element 51 is in a non-conductive state, and the rectifier circuit 30 is turned off. The output is sent to the Zener diode 55 side. The current flowing to the Zener diode 55 side is smoothed by the smoothing capacitor 50 and becomes an operation power source of the control circuit 70. The voltage waveform at the point B of the current detection resistor 40 is obtained by cutting out the non-conductive period of the output of the switching signal generation circuit 79 from the current waveform at the output F of the rectifier circuit 30 shown in FIG. The waveform shown in (c) is obtained. FIG.
The instantaneous maximum values of the currents flowing in (a) and (c) are equal. The instantaneous trip circuit 77 monitors the instantaneous maximum value, and sends an operation signal to the switching circuit 14 when the instantaneous maximum value exceeds a predetermined value. Then, the load switching contact 10 is opened via the electromagnetic coil 13.

The current flowing to the phase current detection resistors 41 and 42 has a continuous waveform equivalent to that before switching division because the return current C from the zener diode 55 and the control circuit 70 is added to the current of the current detection resistor 40. The voltage appearing at the phase current detection resistors 41 and 42 has a waveform shown in FIG. This voltage output is subjected to arithmetic processing by a time trip circuit 78. In this process, a peak level conversion, a short time trip, a maximum phase selection, an effective value conversion, and a long time trip corresponding to each phase are determined. When the predetermined value is exceeded, an operation signal is sent to the switching circuit 14, and the load switching contact 10 is opened via the electromagnetic coil 13.

Instantaneous trip circuit 77 and timed trip circuit 7
8 outputs an operation signal output to the switching circuit 14,
The voltage output is also applied to the base of the transistor 54, and the second switching element 52 is turned off via the transistor 53. At this time, the switching signal generating circuit 79 stops its output, so that the first switching element 51 becomes non-conductive, and all the current from the rectifying circuit 30 can be supplied to the coil 13 through the bypass line 57. The electromagnetic force for tripping the coil 13 is increased. The reason why the voltage supply path is provided to the base of the transistor 53 through the resistor 47 is that the second voltage
The switching element 52 of FIG.

As described above, in the above-described circuit configuration, the current of the rectifier circuit 30 depends on the switching interval of the first switching element 51 and the current detection resistor 40 and the control circuit 70.
In this case, a voltage that faithfully reproduces the current of the rectifier circuit 30 that accurately corresponds to the current of the AC circuits 11 and 12 is obtained in the current detection resistor 40. The circuit interruption operation can be performed without requiring such a positive polarity treatment. On the other hand, the voltage shown in FIG. 2D is applied to the control circuit 70, and the rectifier circuit 30 supplies operating power.

Embodiment 2 In the first embodiment, the power supply voltage setting of the control circuit 70 is set by the Zener diode 55, and the transistor 5 controlled by the switching signal generation circuit 79 is set.
The current detection resistor 40 is determined by the ratio between the conduction period and the non-conduction period.
And the current dividing ratio to the smoothing capacitor 50. Therefore, if the setting of the ratio of conduction to non-conduction is inadequate, the Zener diode 55 overheats or the voltage supplied to the control circuit 70 decreases, which hinders the operation of the control circuit 70.

Embodiment 2 improves this point. FIG. 3 shows a circuit diagram of the embodiment, and FIG. 4 shows a signal waveform of each part in FIG. In the figure, 10
14, 21, 22, 30 to 36, 40 to 42, 47, 4
8, 50 to 54, 56, 57, 70, 77, 78 are the same as those described in the first embodiment shown in FIG.
Reference numerals 45 and 46 denote voltage dividing resistors, which divide the output voltage of the smoothing capacitor 50 into a resistance ratio at a connection point E. A switching signal generation circuit 80 generates a pulse signal for turning on / off the first switching element 51 in accordance with the voltage of the smoothing capacitor 50.

Next, the operation will be described. The switching signal generation circuit 80 outputs when the voltage at the point E is equal to or higher than the upper limit of the predetermined voltage range, and supplies a current to the base of the first switching element 51 to make it conductive. For this reason,
The current from the rectifier circuit 30 is supplied to the first switching element 51
And the voltage of the smoothing capacitor 50 is discharged through the driving of the control circuit 70 and the voltage dividing resistors 45 and 46, and gradually decreases. When the voltage at the point E falls below the lower limit of the predetermined voltage range, the switching signal generation circuit 80 stops outputting, so that the first switching element 51 becomes non-conductive, and the current from the rectifier circuit 30 becomes the first switching element. The current does not flow to the circuit of the element 51, and the smoothing capacitor 50 is charged through the second switching element 52.

The voltage in the predetermined range set in the switching signal generation circuit 80 has a certain width, and the output of the switching signal generation circuit 80 has a waveform shown in FIG. Accordingly, the voltage waveform generated in the current detection resistor 40 becomes the waveform shown in FIG. 4D from the current at the point F shown in FIG. . This instantaneous trip value is monitored by an instantaneous trip circuit 77. When the instantaneous trip value exceeds a predetermined value, the switching circuit 14
And the load switching contact 10 is opened via the electromagnetic coil 13. Since the return current C from the voltage dividing resistors 45 and 46 and the control circuit 70 is added to the current of the current detection resistor 40, the current flowing through the phase current detection resistors 41 and 42 has the same continuous waveform as before the switching division. It becomes a current. The following operation is the same as that of the first embodiment, and the description is omitted.

In the second embodiment, the switching signal generation circuit 80 monitors the voltage at the point E, and sets the first switching element 51 so that the voltage at the point E falls within a predetermined range.
In the normal state, the power supply voltage of the control circuit 70 is kept constant and the voltage at the point D shown in FIG. Supplied to The current to the voltage dividing resistors 45 and 46 is 0.1
By using a resistor having a relatively high resistance value of about mA, current consumption and heat generation in this portion can be suppressed.

Embodiment 3 The second embodiment operates without any problem in a normal state.
However, if the operating voltage of the instantaneous trip circuit 77 is set relatively high, the current transformers 21 and 22
Suddenly increases, the voltage at the point D increases before the instantaneous trip circuit 77 operates, and the voltage drops at the current detection resistor 40 and the protection resistor 43 even when the first switching element 51 is in the conductive state. A state where the voltage at the point F becomes higher than the point D occurs, a part of the current that should originally flow through the first switching element 51 leaks to the smoothing capacitor 50, and the voltage at the point D rises, which hinders the operation of the control circuit 70. Therefore, switching control by the switching signal generation circuit 80 becomes impossible. Further, due to the current leaking to the smoothing capacitor 50 side, an error corresponding to the leak current occurs in the detection voltage of the detection resistor 40. In order to prevent this phenomenon, it is conceivable to reduce the protection resistor 43. However, in this case, the first switching element 51 needs to have a high withstand current, and there is a problem that the circuit becomes large. The third embodiment is to solve such a problem.

FIG. 5 is a circuit diagram showing a third embodiment of the present invention, in which 10 to 14, 21, 22, 30 to 36,
40-43, 45-48, 50-54, 56-58, 7
0, 77, 78 and 80 are the same as those shown in FIG. The transistors 60 and 61 are connected in parallel to the output of the switching signal generation circuit 80.
Is the second switching element 5 via the transistor 53
2 and the transistor 61 controls the first switching element 51.

The operation of the above circuit configuration will be described with reference to FIG. When the voltage at point E exceeds the upper limit of the predetermined voltage range, the switching signal generation circuit 80 causes a current to flow through the base of the transistor 61 as shown in FIG. The switching element 51 is made conductive. At this time, an output is simultaneously supplied to the transistor 60 to make it conductive, and the second switching element 52 is made non-conductive via the transistor 53. That is,
The first switching element 51 and the second switching element 52 are opened and closed in opposite phases by the output of the switching signal generation circuit 80. When the second switching element 52 is non-conductive, all the current from the rectifier circuit 30 flows to the first switching element 51, and the voltage of the smoothing capacitor 50 drives the control circuit 70 and the voltage from the voltage dividing resistors 45 and 46. It gradually decreases due to discharge.

In this state, the output from the current transformers 21 and 22 rises sharply, and the voltage at the point F becomes D as shown in FIG.
Even if the voltage rises above the point, the second switching element 52
Is non-conductive, no current leaks to the smoothing capacitor 50. Therefore, the voltage at the point D does not rise, the switching control of the switching signal generation circuit 80 receiving the power supply from the point D is performed normally, and when the voltage at the point B becomes a predetermined value or more, the instantaneous trip circuit is activated. 77 operates. Therefore, an error does not occur in the detection voltage of the current detection resistor 40,
The resistance value of the protection resistor 43 can also be increased,
As the first switching element 51, a small element having a small current withstand capability can be used.

When the voltage at point E falls below the lower limit of the predetermined voltage range, the switching signal generation circuit 80 stops outputting, so that the first switching element 51 becomes non-conductive and the second switching element 52 becomes conductive. I do. Therefore, the current from the rectifier circuit 30 does not flow to the resistors 43 and 40, and charges the smoothing capacitor 50. The upper and lower limits of the predetermined voltage range have a certain width, and the conduction / non-conduction of the first switching element 51 is in the state of FIG. 6 (d), and the conduction / non-conduction of the second switching element 52 Figure 6 (e)
6, the voltage waveform generated in the current detection resistor 40 is a waveform in which the interval when the first switching element 51 is non-conductive is missing as shown in FIG. The instantaneous trip circuit 77 monitors the instantaneous maximum value of the waveform, and when the maximum value exceeds a predetermined value, the instantaneous trip circuit 77 sends an operation signal to the switching circuit 14 as shown in FIG. Then, the switching contact 10 is opened via the electromagnetic coil 13.

Embodiment 4 FIG. 7 is a circuit diagram showing a fourth embodiment of the present invention, in which 10 to 14, 21, 22, 30 to 36, 40 to 4
3, 45 to 48, 50 to 54, 56 to 58, 70, 7
7, 78 and 80 are the same as those shown in FIG. Reference numeral 90 denotes an instantaneous current detection circuit which constitutes a part of the control circuit 70. When the voltage detected by the current detection resistor 40 exceeds a predetermined value, the transistor 62 is turned on, and the transistor 53 is turned on.
Are turned off, and the second switching element 52 is turned off.

The operation of the above circuit configuration will be described with reference to FIG. When the outputs from the current transformers 21 and 22 are normal, the detection voltage of the current detection resistor 40 is also normal, and the instantaneous current detection circuit 9
0 indicates no output, and other circuit breaking operations are the same as those of the conventional device. The output from the current transformers 21 and 22 rises sharply,
When the instantaneous maximum voltage value of the current detection resistor 40 exceeds the set value, the instantaneous current detection circuit 90 outputs an output, turns on the transistor 62 as shown in FIG. The element 52 is turned off (FIG. 8E). Therefore, even if the voltage at the point F rises above the voltage at the point D as shown in FIG. 8G due to the voltage drop of the current detection resistor 40 and the protection resistor 43, the second switching element 52 is non-conductive. No current leaks to the smoothing capacitor 50. Therefore, the voltage at the point D does not increase, the switching control of the switching signal generation circuit 80 is performed normally, and no error occurs in the detection voltage of the current detection resistor 40. Therefore, the resistance value of the protection resistor 43 can be increased, and the first switching element 51 can be a small element having a small withstand current.

The voltage waveform generated at the current detection resistor 40 is:
FIG. 8 shows the output of the switching signal generation circuit 80.
As shown in (f), the waveform is missing during the non-conduction time of the first switching element 51. The instantaneous trip circuit 77 monitors the instantaneous maximum value of this waveform, and when the maximum value exceeds a predetermined value, as shown in FIG. An operation signal is transmitted, and the switching contact 10 is opened via the electromagnetic coil 13. In the above embodiment, the current detector of the circuit breaker for the single-phase two-wire AC circuit has been described for the sake of simplicity. However, the present invention is not limited to the three-phase three-wire three-phase four-wire AC circuit. It is easy to apply to.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram of a circuit breaker according to Embodiment 1 of the present invention.

FIG. 2 is a waveform diagram illustrating an operation of the circuit breaker according to Embodiment 1 of the present invention.

FIG. 3 is a circuit configuration diagram of a circuit breaker according to Embodiment 2 of the present invention.

FIG. 4 is a waveform diagram illustrating an operation of the circuit breaker according to Embodiment 2 of the present invention.

FIG. 5 is a circuit configuration diagram of a circuit breaker according to Embodiment 3 of the present invention.

FIG. 6 is a waveform diagram illustrating an operation of the circuit breaker according to Embodiment 3 of the present invention.

FIG. 7 is a circuit configuration diagram of a circuit breaker according to Embodiment 4 of the present invention.

FIG. 8 is a waveform diagram illustrating an operation of the circuit breaker according to Embodiment 4 of the present invention.

FIG. 9 is a circuit configuration diagram showing a conventional circuit breaker.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Load switching contact, 11, 12 AC electric circuit, 13 Electromagnetic coil, 14 Switching circuit, 21, 22 Current transformer, 30
Rectifier circuit, 40 current detection resistor, 41, 42 phase current detection resistor, 43 protection resistor, 45, 46 voltage dividing resistor, 5
0 smoothing capacitor, 51 first switching element,
52 second switching element, 53, 54 transistor, 55 zener diode, 57 bypass line,
58 Zener diode, 60, 61, 62 Transistor, 70 Control circuit, 77 Instantaneous trip circuit, 78
Timed trip circuit, 79 switching signal generation circuit,
80 switching signal generation circuit, 90 instantaneous current detection circuit.

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Shuko Kantaka 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Inside Mitsubishi Electric Corporation (72) Inventor Yuji 2-3-2 Marunouchi 2-chome, Chiyoda-ku, Tokyo (56) References JP-A-6-60791 (JP, A) JP-A-8-126185 (JP, A) JP-A-3-124215 (JP, A) JP-A-4-188532 ( JP, A) JP-A-63-274321 (JP, A) JP-A-57-20118 (JP, A) JP-B-7-10145 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , (DB name) H02H 3/00-3/253

Claims (7)

(57) [Claims] 1. A load switching contact which is inserted into an AC circuit and is opened and closed by an electromagnetic coil, a current transformer for detecting a current of the AC circuit, and a secondary current of the current transformer is converted into a unidirectional current. A rectifier circuit, a first switching element connected between output terminals of the rectifier circuit, a current detection resistor connected in series to the first switching element, and a current of each phase of the AC circuit. A phase current detection resistor, a smoothing capacitor connected in parallel to a series circuit of the first switching element and the current detection resistor, and a first switching element.
Second switching provided between the smoothing capacitor
The operating power supply from the element and the output end of the smoothing capacitor
A supplied control circuit, said control circuit comprising:
The instantaneous maximum value of the voltage generated by the current flowing to the detection resistor
Monitoring, and when this is higher than a predetermined value,
An instantaneous trip circuit to open the load switching contact
Monitors the voltage generated by the current flowing through the phase current detection resistor
After this is timed, the load is transferred through the electromagnetic coil.
A timed trip circuit for opening and closing the switching contact;
The switching element and the second switching element in opposite phases
A circuit breaker comprising: a switching element control means for conducting / non-conducting . 2. The switching element control means according to claim 1 , wherein
The voltage of the voltage divider connected in parallel with the capacitor
Within the first switching element at the upper end of the voltage range
Signal to turn on and turn off at the lower end of the voltage range.
The circuit breaker according to claim 1, further comprising a switching signal generating circuit . 3. A switching device control means, smooth con
Monitors the voltage of the capacitor within a specified range and sets the upper limit of the voltage range.
Rise (fall) at the lower end of the voltage range
Generates a (rising) pulse signal, and this pulse signal
The first switching element and the second switching element
2. The circuit breaker according to claim 1 , further comprising a switching signal generating circuit for turning on / off the conduction in opposite phases . 4. The switching element control means includes a first switch .
The switching element and the second switching element in opposite phases
The circuit breaker according to claim 1, further comprising a switching signal generation circuit that generates a pulse signal having a predetermined period for turning on / off. 5. A control circuit for controlling a voltage of a smoothing capacitor.
Monitoring within a certain range, rising at the upper limit of the voltage range (lower
Pulse), falling (rising) pulse at the lower end of the voltage range
A first switching signal is generated by the pulse signal.
Signal generation circuit for turning on / off the switching element
And the voltage of the current detection resistor, and by this voltage value,
Reverse the second switching element with the first switching element
The circuit breaker according to claim 1 , further comprising: an instantaneous current detection circuit that conducts / non-conducts in a phase . 6. The phase current detection resistor flows through the current detection resistor.
Current, switching element control means, instantaneous trip
Return to the operating power supply current of the timed trip circuit.
The method according to any one of claims 1 to 4, wherein
The described circuit breaker. 7. A rectifier circuit directly connected to one end of an electromagnetic coil.
2. The device according to claim 1, further comprising a continuous bypass line.
The circuit breaker according to claim 5 .