Circuit breaker electric charging device

Abstract

To obtain an electric charging device for a circuit breaker that can ensure contact reliability of switch contacts.SOLUTION: An electric charging device 200 includes a main power supply 204 that supplies power to a motor 203, a microswitch 207 whose contact is turned on when it detects that a closing spring has been fully charged, a main power off circuit 209 that stops the operation of the main power supply 204 when the microswitch 207 detects the completion of charging, and a motor drive circuit 206 that has a first switching element connected in series to the motor 203, and turns off the first switching element when the microswitch 207 detects the completion of charging. The main power off circuit 209 and the motor drive circuit 206 are supplied with power from the main power supply 204 through the contacts of the microswitch 207 when the microswitch 207 detects the completion of charging.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to an electric charging device for a circuit breaker that remotely charges a closing spring of the circuit breaker. [Background technology]

[0002] The electric charging device electrically charges the closing spring of a circuit breaker using a motor, and is an accessory device that controls the motor according to the state of a changeover switch that changes over depending on the charging state. The rotational force of the motor is reduced by gears and converted into a force that charges the closing spring by a charging mechanism. The electric charging device supplies a drive voltage to the motor only while the closing spring is being charged, and stops the voltage supply to the motor as soon as charging is completed (for example, see Patent Document 1).

[0003] The voltage supply to the motor is switched either directly by a change-over switch or via a pair of power relays that double-cut the motor circuit. Charging of the closing spring begins depending on the state of the change-over switch and the application of a control voltage, and when charging is complete, the change-over switch switches, cutting off the control voltage and stopping the motor. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 60-208014 Summary of the Invention [Problem to be solved by the invention]

[0005] The motor torque required to charge the closing spring is large, and the motor drive current increases as the motor rated voltage decreases. Because changeover switches control large motor drive power, applicable microswitches tend to be high-capacity, large, and expensive, and also have issues such as susceptibility to chattering and contact wear. Like microswitches, power relays tend to be high-capacity, large, and expensive, and also have issues such as chattering and contact wear.

[0006] The present disclosure has been made in consideration of the above, and aims to provide an electric charging device for a circuit breaker that can ensure the contact reliability of the switch contacts. [Means for solving the problem]

[0007] In order to solve the above problems and achieve the object, the disclosed electric charging device for a circuit breaker includes a main power supply that supplies power to a motor that charges a closing spring of the circuit breaker, a first switch whose contacts turn on when it detects completion of charging of the closing spring, a main power supply off circuit that stops the operation of the main power supply when the first switch detects completion of charging, and a motor drive circuit that has a first switching element connected in series to the motor and turns off the first switching element when the first switch detects completion of charging. The main power supply off circuit and the motor drive circuit are characterized in that when the first switch detects completion of charging, power is supplied from the main power supply via the contacts of the first switch. Effect of the Invention

[0008] According to the electric charging device for a circuit breaker of the present disclosure, it is possible to ensure the contact reliability of the switch contacts. [Brief description of the drawings]

[0009] [Figure 1] A functional block diagram showing a configuration of an electric charging device according to a first embodiment. [Diagram 2] A circuit diagram showing the configuration of a main power supply of an electric charging device according to a first embodiment. [Diagram 3] A circuit diagram showing the configuration of a sub-power supply of an electric charging device according to a first embodiment. [Figure 4] A circuit diagram showing the configuration of a motor drive circuit of an electric charging device according to a first embodiment. [Diagram 5] A circuit diagram showing the configuration of a timer circuit of an electric charging device according to a first embodiment. [Figure 6] A circuit diagram showing the configuration of a main power supply off circuit of an electric charging device according to a first embodiment. [Figure 7] FIG. 11 is a side cross-sectional view showing an open state in which charging is completed in the circuit breaker according to the second embodiment; [Figure 8] FIG. 13 is a diagram showing a configuration state of a part of a circuit breaker according to a second embodiment. [Figure 9] FIG. 13 is a diagram showing the relationship between a main shaft, an insulating link arm, and an insulating link in a circuit breaker according to a second embodiment. [Figure 10] FIG. 13 is a diagram showing a configuration state of a part of a circuit breaker according to a second embodiment. [Figure 11] FIG. 11 is a cross-sectional view showing a tripped state in a circuit breaker body of a circuit breaker according to a second embodiment. [Figure 12] FIG. 13 is a diagram showing a configuration state of a part of a circuit breaker according to a second embodiment. [Figure 13] FIG. 11 is a side view showing an example of an electric charging mechanism according to a second embodiment. [Figure 14] FIG. 11 is an exploded front view showing a state before assembly of the electric charging mechanism according to the second embodiment; [Figure 15] FIG. 11 is a front view showing the assembled state of the electric charging mechanism according to the second embodiment; [Figure 16] A circuit diagram showing the configuration of a main power supply of an electric charging device for a circuit breaker according to a second embodiment. [Figure 17] A functional block diagram showing a configuration of an electric charging device according to a third embodiment. [Figure 18] A circuit diagram showing the configuration of a main power supply of an electric charging device according to a third embodiment. [Figure 19]A circuit diagram showing the configuration of a motor drive circuit of an electric charging device according to a third embodiment. [Figure 20] A circuit diagram showing the configuration of a timer circuit of an electric charging device according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an electric charging device for a circuit breaker according to an embodiment will be described in detail with reference to the drawings.

[0011] Embodiment 1 FIG. 1 is a functional block diagram showing the configuration of an electric charging device according to a first embodiment. FIG. 2 is a circuit diagram showing the configuration of a main power supply of the electric charging device according to the first embodiment. FIG. 3 is a circuit diagram showing the configuration of a sub-power supply of the electric charging device according to the first embodiment. FIG. 4 is a circuit diagram showing the configuration of a motor drive circuit of the electric charging device according to the first embodiment. FIG. 5 is a circuit diagram showing the configuration of a timer circuit of the electric charging device according to the first embodiment. FIG. 6 is a circuit diagram showing the configuration of a main power supply off circuit of the electric charging device according to the first embodiment.

[0012] As shown in FIG. 1, the electric charging device 200 of the first embodiment includes a rectifier circuit 202, a motor 203, a main power supply 204, a sub-power supply 205, a motor drive circuit 206, a microswitch 207 which is a first switch, a timer circuit 208, a main power supply off circuit 209, and diodes 210 and 211.

[0013] The rectifier circuit 202 is connected to the AC power source 201 and converts AC power into DC power. The motor 203 is a power source for charging the closing spring of the circuit breaker. The main power source 204 is connected to the DC side of the rectifier circuit 202 and generates low-voltage power for driving the motor 203. The sub-power source 205 is connected to the DC side of the rectifier circuit 202 and generates low-voltage power with a voltage lower than the output voltage of the main power source 204. The motor drive circuit 206 drives the motor 203. The microswitch 207 is connected to the motor drive circuit 206, the main power source 204, and the sub-power source 205 and turns ON when the closing spring is fully charged. The microswitch 207 has a contact that turns ON when the closing spring is fully charged. The timer circuit 208 stops the motor 203 if the microswitch 207 does not turn ON even after a preset time has elapsed after the motor 203 is driven. A main power supply off circuit 209 stops the output of the main power supply 204 when the charging of the closing spring is completed. A diode 210 is connected between the main power supply 204 and the micro switch 207. A diode 211 is connected between the sub power supply 205 and the micro switch 207.

[0014] 2, the main power supply 204 includes a transformer 204a, a field effect transistor (hereinafter, referred to as FET) 204b, a control circuit 204c, a diode 204d, a resistor 204e, a capacitor 204f, a resistor 204g, a resistor 204h, a diode 204i, a smoothing capacitor 204j, a diode 204k, a diode 204m, and a resistor 204n. The main power supply 204 is an insulated power supply having the transformer 204a, and is a switching power supply that generates a secondary voltage on the secondary side of the transformer 204a by switching the FET 204b.

[0015] The transformer 204a has one end on the primary side connected to the positive side of the output of the rectifier circuit 202, and the other end on the primary side connected to the connection point between the diode 204d and the FET 204b. The transformer 204a converts the high voltage output from the rectifier circuit 202 to a low voltage. The FET 204b is connected to the primary side of the transformer 204a and performs switching. The source of the FET 204b is connected to the negative side of the output of the rectifier circuit 202. The control circuit 204c has an output terminal connected to the gate of the FET 204b via the resistor 204h and controls the switching of the FET 204b. The diode 204d has an anode connected to the drain of the FET 204b. The resistor 204e has one end connected to the cathode of the diode 204d and the other end connected to the positive side of the output of the rectifier circuit 202. The capacitor 204f is connected in parallel to the resistor 204e. The resistor 204g has one end connected to the source of the FET 204b and the other end connected to the gate of the FET 204b. The resistor 204h has one end connected to the gate of the FET 204b and the other end connected to the output terminal of the control circuit 204c. The diode 204i has an anode connected to one end of the secondary side of the transformer 204a, and the output from the cathode of the other end becomes the output of the main power supply 204. The smoothing capacitor 204j has one end connected to the cathode of the diode 204i and the other end connected to the other end of the secondary side of the transformer 204a. The diode 204k has a cathode connected to the power supply terminal of the control circuit 204c and an anode connected to the output of the main power supply 204. The diode 204m has a cathode connected to the power supply terminal of the control circuit 204c and an anode connected to the output of the sub power supply 205. The resistor 204n has one end connected to a control terminal of the control circuit 204c and the other end connected to a power supply terminal of the control circuit 204c. The control terminal of the control circuit 204c is connected to the main power supply off circuit 209.

[0016] As shown in FIG. 3, the sub-power supply 205 includes an FET 205a, a diode 205b, a resistor 205c, a Zener diode 205d, a resistor 205e, a diode 205f, a Zener diode 205g, and a capacitor 205h.

[0017] The FET 205a converts the high voltage output from the rectifier circuit 202 into a low voltage. The anode of the diode 205b is connected to the positive side of the output of the rectifier circuit 202, and the cathode is connected to the drain of the FET 205a. The resistor 205c has one end connected to the cathode of the diode 205b and the other end connected to the gate of the FET 205a. The Zener diode 205d has a cathode connected to the gate of the FET 205a and an anode connected to the source of the FET 205a. The resistor 205e has one end connected to the gate of the FET 205a and the other end connected to the source of the FET 205a. The diode 205f has an anode connected to the source of the FET 205a, and the output from the cathode becomes the output of the sub-power supply 205. The Zener diode 205g has a cathode connected to the gate of the FET 205a and an anode connected to ground. The capacitor 205h has one end connected to the cathode of the diode 205f and the other end connected to ground.

[0018] 4, the motor drive circuit 206 includes an FET 206a which is a first switching element, a resistor 206b, a resistor 206c, a transistor 206d, a resistor 206e, a diode 206f, a diode 206g, a resistor 206h, and a resistor 206i. A freewheeling diode 206j is connected in inverse parallel to the FET 206a.

[0019] The drain of the FET 206a is connected in series to the motor 203, and the source is connected to the ground. The FET 206a is a switch that turns on and off the current flowing to the motor 203. The resistor 206b has one end connected to the output of the main power supply 204, and the other end connected to the gate of the FET 206a. The resistor 206c has one end connected to the gate of the FET 206a, and the other end connected to the ground. The collector of the transistor 206d is connected to the gate of the FET 206a, and the emitter is connected to the ground. The resistor 206e has one end connected to the base of the transistor 206d, and the other end connected to the ground. The anode of the diode 206f is connected to the micro switch 207, and the cathode is connected to the base of the transistor 206d. The anode of the diode 206g is connected to the timer circuit 208, and the cathode is connected to the base of the transistor 206d. The resistor 206h is connected between the anode of the diode 206f and the microswitch 207. The resistor 206i is connected between the anode of the diode 206g and the timer circuit 208.

[0020] As shown in FIG. 5, the timer circuit 208 includes a timer unit 208a, a transistor 208b, a resistor 208c, a resistor 208d, a transistor 208e, a resistor 208f, a resistor 208g, a thyristor 208h, a resistor 208i, a transistor 208j, a resistor 208k, a resistor 208m, a diode 208n, a diode 208p, a resistor 208q, and a resistor 208r.

[0021] The timer unit 208a is connected to the sub-power supply 205 and the ground. The transistor 208b has a base connected to the output of the timer unit 208a and a collector connected to the sub-power supply 205. The resistor 208c has one end connected to the emitter of the transistor 208b. The resistor 208d has one end connected to the other end of the resistor 208c and the other end connected to the ground. The transistor 208e has a collector connected to the sub-power supply 205 and an emitter connected to the motor drive circuit 206. The resistor 208f has one end connected to the sub-power supply 205 and the other end connected to the base of the transistor 208e. The resistor 208g has one end connected to the base of the transistor 208e. The thyristor 208h has an anode connected to the other end of the resistor 208g, a cathode connected to the ground, and a gate connected to the connection point between the resistors 208c and 208d. One end of the resistor 208i is connected to the sub-power supply 205. The collector of the transistor 208j is connected to the other end of the resistor 208i, and the emitter is connected to ground. The resistor 208k is connected to the collector of the transistor 208j, and the other end is connected to ground. The resistor 208m is connected to the base of the transistor 208j, and the other end is connected to ground. The diode 208n is connected to the base of the transistor 208j, and the anode is connected to the micro switch 207. The diode 208p is connected to the base of the transistor 208j, and the anode is connected to the emitter of the transistor 208e. The resistor 208q is connected between the micro switch 207 and the anode of the diode 208n. The resistor 208r is connected between the emitter of the transistor 208e and the anode of the diode 208p.

[0022] Furthermore, timer unit 208a includes a timer capacitor 208a1 which is a first capacitor, a diode 208a2, a discharge resistor 208a3, a transistor 208a4, a resistor 208a5, a Zener diode 208a6, and a charge resistor 208a7.

[0023] The timer capacitor 208a1 has one end connected to the sub-power supply 205. The diode 208a2 has a cathode connected to the other end of the timer capacitor 208a1. The discharge resistor 208a3 has one end connected to the sub-power supply 205 and the other end connected to the anode of the diode 208a2. The transistor 208a4 has a collector connected to the anode of the diode 208a2, a base connected to the collector of the transistor 208j, and an emitter connected to ground. The resistor 208a5 has one end connected to the sub-power supply 205. The Zener diode 208a6 has a cathode connected to the base of the transistor 208b and an anode connected to the cathode of the diode 208a2. The charging resistor 208a7 has one end connected to the cathode of the diode 208a2 and the other end connected to the anode of the diode 208a2.

[0024] The timer section 208a, the transistor 208b, the resistor 208c, the resistor 208d, the transistor 208e, the resistor 208f, the resistor 208g, and the thyristor 208h constitute an off-holding circuit that holds the FET 206a of the motor drive circuit 206 in the OFF state.

[0025] 6, the main power supply off circuit 209 includes a transistor 209a, a resistor 209b, a transistor 209c, and a resistor 209d. The transistor 209a has a collector connected to the control circuit 204c of the main power supply 204, and an emitter connected to ground. The resistor 209b has one end connected to the base of the transistor 209a, and the other end connected to ground. The transistor 209c has a collector connected to the sub power supply 205, an emitter connected to ground, and a base connected to the microswitch 207. The resistor 209d has one end connected to the base of the transistor 209c, and the other end connected to ground.

[0026] Next, the operation of the electric charging device 200 will be described. When an AC voltage of about AC 100V to 200V is supplied from the AC power source 201, the rectifier circuit 202 converts the supplied AC voltage into a DC voltage. In the main power source 204 shown in FIG. 2, the output of the control circuit 204c causes the FET 204b to perform a switching operation, thereby converting the DC voltage output from the rectifier circuit 202 into a low-voltage secondary voltage in the transformer 204a. The main power source 204 smoothes the converted secondary voltage with the diode 204i and the smoothing capacitor 204j, and outputs the smoothed low voltage, for example, a DC voltage of DC 24V.

[0027] 3 is a series power supply that steps down the DC voltage output from the rectifier circuit 202 using an FET 205a. If the on-voltage of the FET 205a is about 3V and the Zener voltage of the Zener diode 205g is about 23V, the output voltage Vd of the sub-power supply 205 is Vd≈23V−3V=about 20V.

[0028] When the charge signal of the closing spring is OFF, that is, the microswitch 207 is OFF, and a power supply voltage is applied from the AC power supply 201, the main power supply 204 and the sub power supply 205 start up.

[0029] Next, the operation of the motor drive circuit 206 will be described. When the microswitch 207 is OFF and the main power supply 204 and the sub power supply 205 are started up, in the motor drive circuit 206 shown in Fig. 4, the transistor 206d remains OFF and the voltage of the main power supply is applied to the gate of the FET 206a via the resistor 206b, the FET 206a is turned ON, and the motor 203 is driven. As the motor 203 is driven, charging of the closing spring is started. At the same time, the transistor 208a4 of the timer circuit 208 shown in Fig. 5 is turned ON, and charging of the timer capacitor 208a1 is started via the charging resistor 208a7.

[0030] When the charging of the closing spring by the motor 203 is completed, the microswitch 207 is turned ON to output a charge completion signal, and the transistor 206d is turned ON via the resistor 206h and the diode 206f in the motor drive circuit 206 shown in Fig. 4. As a result, the gate of the FET 206a becomes low level, the FET 206a is turned OFF, and the drive of the motor 203 is stopped.

[0031] At the same time, the charge completion signal, which is the ON signal of the microswitch 207, is also input to the main power supply off circuit 209 shown in Fig. 6, and the transistor 209c turns ON. When the transistor 209c turns ON, the transistor 209a turns OFF, and a low level is input to the control circuit of the main power supply 204. As a result, the control circuit 204c stops the switching output to the FET 204b, and the main power supply 204 goes into a stopped state.

[0032] 5, and turns on transistor 208j via resistor 208q and diode 208n. When transistor 208j turns on, transistor 208a4 turns off, stopping charging of timer capacitor 208a1, and the charge of timer capacitor 208a1 is discharged via discharge resistor 208a3 and diode 208a2.

[0033] Next, the operation of the timer circuit 208 will be described. The timer setting time of the timer circuit 208 is set by the Zener voltage of the Zener diode 208a6. As described above, when the microswitch 207 is ON, the transistor 208j is turned ON, and the timer operation of the timer circuit 208 is turned OFF. On the other hand, when the microswitch 207 is OFF and there is a voltage output from the sub-power supply 205, the transistor 208a4 is turned ON and starts charging the timer capacitor 208a1. When the charging voltage of the timer capacitor 208a1 exceeds the first value, which is the Zener voltage of the Zener diode 208a6, and a leakage current occurs, the transistor 208b is turned ON and the thyristor 208h is turned ON. While the thyristor 208h is ON, the transistor 206d is turned ON via the resistor 206h and the diode 206f of the motor drive circuit 206 shown in FIG. 4, the gate of the FET 206a for turning on and off is pulled down, and the FET 206a is kept in the OFF state. As a result, the driving of the motor 203 is stopped.

[0034] When the charging of the closing spring by the motor 203 is completed before the Zener voltage of the Zener diode 208a6 is exceeded, and the microswitch 207 is turned ON, the transistor 208j is turned ON, and the transistor 208a4 is turned OFF, and the charge stored in the timer capacitor 208a1 is consumed by the discharge resistor 208a3, and the timer unit 208a is reset.

[0035] A case will be described below where the driving state of motor 203 exceeds the timer setting time of timer circuit 208 or motor 203 is repeatedly operated continuously with short off times. In such a case, timer capacitor 208a1 is charged, and the charging voltage of timer capacitor 208a1 reaches the Zener voltage of Zener diode 208a6. Then, Zener diode 208a6 turns ON, and transistor 208b also turns ON. When transistor 208b turns ON, thyristor 208h turns ON, and transistor 208e also remains ON.

[0036] When the transistor 208e is turned ON, the output voltage of the sub-power supply 205 is applied to the resistor 206i of the motor drive circuit 206. This causes the transistor 206d to be turned ON via the diode 206g, the FET 206a to be turned OFF, and the drive of the motor 203 is stopped.

[0037] Furthermore, when transistor 208e is turned ON, the output voltage of sub-power supply 205 is also applied to resistor 208r. This causes transistor 208j to be turned ON via diode 208p, and transistor 208a4 to be turned OFF, stopping charging of timer capacitor 208a1. As a result, the charge of timer capacitor 208a1 is discharged via discharge resistor 208a3 and diode 208a2.

[0038] Next, a description will be given of the refreshing operation of the contacts of the microswitch 207. When charging of the closing spring is completed and the microswitch 207 detects the completion of charging, the main power supply 204 is stopped by the motor drive circuit 206 via the microswitch 207, and at the same time, the motor 203 is forcibly turned off by the motor drive circuit 206. In addition, when charging is completed, power is supplied to the motor drive circuit 206, timer circuit 208, and main power supply off circuit 209 from both the main power supply 204 and the sub power supply 205 via the microswitch 207.

[0039] As a result, the motor 203 is turned off without delay, and the charge remaining in the smoothing capacitor 204j on the secondary side of the transformer 204a of the main power supply 204 is discharged by supplying it to the motor drive circuit 206, the timer circuit 208, and the main power supply off circuit 209 via the microswitch 207. Furthermore, after discharging, the output of the sub power supply 205 is switched to 20V, and the OFF state of the motor 203 is maintained with a limited current.

[0040] In this way, the oxide film on the contacts of microswitch 207 is cleaned and refreshed with a current of about 5 mA at DC 24 V, which is the output of main power supply 204, every time charging is completed, so that it is possible to ensure the contact reliability of microswitch 207 even when used with a small load during normal operation. Also, since the normal load is reduced, wide input sub-power supply 205 can be configured with an inexpensive series power supply.

[0041] As described above, according to the first embodiment, when the microswitch 207 detects the completion of charging, the motor drive circuit 206 stops the main power supply 204 via the microswitch 207, and at the same time, the motor drive circuit 206 forcibly turns off the motor 203. Furthermore, when charging is completed, power is supplied from the main power supply 204 via the microswitch 207 to the motor drive circuit 206, the timer circuit 208, and the main power supply off circuit 209. This allows the motor 203 to be stopped immediately. Furthermore, the oxide film on the contacts of the microswitch 207 is cleaned and refreshed every time charging is completed, so that the contact reliability of the contacts of the microswitch 207 can be ensured.

[0042] In addition, the charge remaining in the smoothing capacitor 204j of the transformer 204a of the main power supply 204 is discharged by supplying power to the motor drive circuit 206, the timer circuit 208, and the main power supply off circuit 209 via the microswitch 207. This makes it possible to stabilize the variation in the stop time of the motor 203 caused by differences in the amount of remaining charge in the smoothing capacitor 204j due to differences in the primary input voltage to the main power supply 204, thereby providing the user with a sense of security.

[0043] According to the first embodiment, the main power supply 204 is an insulated power supply having a transformer 204a. According to the first embodiment, the collector of the transistor 209c of the main power supply off circuit 209 is connected to the sub-power supply 205, and when charging is completed, the main power supply 204 is stopped by the operation of the transistor 209c connected to the sub-power supply 205. According to the first embodiment, when the driving time of the motor 203 exceeds the timer set time, the timer circuit 208 keeps the FET 206a that drives and controls the motor 203 in the OFF state. Thus, in the first embodiment, the main power supply 204 is an insulated power supply having a transformer 204a, the motor 203 is driven by the output of the main power supply 204, the ON / OFF of the main power supply 204 is controlled by the output of the sub-power supply 205 and the microswitch 207, and when charging is completed, the timer circuit 208 latches off the FET 206a that drives and controls the motor 203. This makes it possible to eliminate the double-pole power relay.

[0044] According to the first embodiment, the main power supply 204 is configured as a switching power supply, so the input voltage can be compatible with power supplies worldwide, while the motor rated voltage can be standardized at a low voltage, for example, DC 24 V. Also, the microswitch 207 can be configured as a small-capacity microswitch, which reduces costs.

[0045] Also, according to the first embodiment, the timer circuit 208 is provided with a protection function that latches off the FET 206a of the motor drive circuit 206 to stop the motor 203 when the voltage of the timer capacitor 208a1, which is charged while the closing spring is being charged and discharged when charging is completed, rises to or exceeds the Zener voltage of the Zener diode 208a6. This makes it possible to realize a protection function in cases where the gear of the electric charging device 200 breaks down, the motor is restrained due to an internal wire break in the motor and charging does not stop within a specified time, or where the gear of the main mechanism or the electric charging device 200 breaks down and charging is repeated without a sufficient discharge time having elapsed.

[0046] Furthermore, according to the first embodiment, the main power supply 204 limits the output when it detects an overcurrent caused by a drop in the input voltage or motor restraint due to gear failure, etc., and even if such an output-limited state continues, the timer circuit 208 latches off the FET 206a of the motor drive circuit 206 to stop the motor 203. Therefore, it is possible to realize overcurrent protection without relying on fuses.

[0047] Also, according to the first embodiment, after main power supply 204 is discharged, it switches to the output of sub power supply 205 of 20V, and sub power supply 205 holds motor 203 in the OFF state, so that even if microswitch 207 has an OFF failure after charging is completed, the charging completion state can be maintained, and it is possible to respond to quick re-powering of the main device as a charge priority circuit. Note that motor 203 is stopped at this time by timer circuit 208.

[0048] In the first embodiment, if the charge priority system is not used, the sub-power supply 205 can be eliminated. In this case, the timer circuit 208 is supplied with power from the secondary output of the transformer 204a of the main power supply 204, and the contact refreshing of the microswitch 207 is realized by separately configuring an integrating circuit or the like.

[0049] Embodiment 2 The second embodiment shows an example in which the electric charging device 200 described in the first embodiment is applied to a circuit breaker. Also, the main power supply 204 in the first embodiment constitutes an insulated power supply using an insulating transformer, but the main power supply in the second embodiment is a non-insulated power supply, which is a difference between the electric charging device 200 described in the first embodiment and the electric charging device in the second embodiment. Therefore, in the second embodiment, insulation is provided between the motor 203 and the frame that holds the motor 203, and between the gear driven by the motor 203 and the charging mechanism of the circuit breaker, making it possible to eliminate double-breaking by a power relay.

[0050] FIG. 7 is a side cross-sectional view showing an open state where charging is completed in the circuit breaker according to the second embodiment. FIG. 8 is a diagram showing a state of a part of the configuration of the circuit breaker according to the second embodiment. FIG. 9 is a diagram showing a relationship between a main shaft, an insulating link arm, and an insulating link in the circuit breaker according to the second embodiment. FIG. 10 is a diagram showing a state of a part of the configuration of the circuit breaker according to the second embodiment. FIG. 11 is a cross-sectional view showing a tripped state of the circuit breaker body of the circuit breaker according to the second embodiment. FIG. 12 is a diagram showing a state of a part of the configuration of the circuit breaker according to the second embodiment.

[0051] The circuit breaker 1 shown in Fig. 7 is an air circuit breaker, and is connected between a power supply device (not shown) and a load device (not shown). The load device is, for example, an electrical device that consumes power supplied from the power supply device. The circuit breaker 1 includes an insulating housing 10 having a molded case 10a and a molded cover 10b. Inside the housing 10, members of an electrical system 6 that mainly opens and closes the main circuit are arranged on the right side in Fig. 7, and members of a mechanical system 7 for opening and closing are arranged on the left side in Fig. 7.

[0052] The electrical system 6 of the circuit breaker 1 includes a load-side fixed conductor 42 having one end protruding from the housing 10 and connected to a load device, a movable contactor 43 having a movable contact 43a fixed thereto, and a power-source-side fixed conductor 44 having one end protruding from the housing 10 and connected to a power source device and having a fixed contact 44a opposed to the movable contact 43a fixed to the other end. In order to make the explanation easier to understand, in several drawings including Fig. 7, a three-dimensional orthogonal coordinate system is illustrated in which the vertical direction is the Z-axis direction, the direction in which the load-side fixed conductor 42 and the power-source-side fixed conductor 44 extend is the X-axis direction, and the direction perpendicular to the X-axis and Z-axis is the Y-axis direction.

[0053] The electric system 6 also includes a flexible conductor 45 having one end fixed to the housing 10 and the other end fixed to the movable contactor 43. The load side fixed conductor 42 and the power supply side fixed conductor 44 are electrically connected to each other via the flexible conductor 45 by contacting the movable contactor 43a and the fixed contactor 44a. The movable contactor 43 on which the movable contactor 43a is disposed is attached to the mechanical system 7 by a connecting pin 49 and is driven by the mechanical system 7.

[0054] The electric system 6 also includes a movable member holder 46, one end of which is rotatably attached to a holder shaft 48 held by the molded case 10a, a pressure spring 47 attached between the molded case 10a and the movable contact 43, and an arc-extinguishing chamber 4. When the circuit breaker 1 is in the open state shown in Fig. 7, the pressure spring 47 urges the movable contact 43a in a direction in which it is pulled away from the fixed contact 44a. When the circuit breaker 1 is in the closed state shown in Fig. 11, the pressure spring 47 urges the movable contact 43a in a direction in which it is pressed against the fixed contact 44a. The arc-extinguishing chamber 4 interrupts an arc that is generated when the movable contact 43a is pulled away from the fixed contact 44a.

[0055] Next, the mechanical system 7 of the circuit breaker 1 will be described. As shown in Fig. 8, the circuit breaker 1 includes a pair of frames 16a, 16b, and is fixed to the housing 10, a camshaft 21, and a nut 82. The frames 16a and 16b are arranged with a gap between them by the camshaft 21 and the nut 82. The camshaft 21 is a bolt, but may be a member other than a bolt.

[0056] The mechanism system 7 is disposed so as to be sandwiched between the frames 16a and 16b. The holder shaft 48, the connecting pin 49, and each shaft of the mechanism system 7 are disposed so as to be parallel to the axis of the camshaft 21, i.e., in the Y-axis direction, unless otherwise specified.

[0057] The mechanical system 7 of the circuit breaker 1 includes a guide plate 17 having one end fixed to the frame 16 and extending upward in FIG. 7, a closing spring 18 attached to the guide plate 17, a charge arm 24 having a middle portion rotatably supported on a shared fixed shaft 24a, and a charge cam 22 that rotates the charge arm 24.

[0058] A spring hook pin 24d is provided at one end of the charge arm 24, and the spring hook pin 24d is inserted into an elongated hole 16c formed in the frame 16. One end of the closing spring 18 abuts against the spring hook pin 24d, and the other end abuts against the frame 16. The charge cam 22 is fixed to the camshaft 21.

[0059] The mechanism system 7 includes an electric charging mechanism 90 that rotates the charging cam 22 to charge the closing spring 18. The electric charging mechanism 90 includes a ratchet gear 91. The ratchet gear 91 is fixed to the camshaft 21 in the same manner as the charging cam 22, and the electric charging mechanism 90 rotates the charging cam 22 by rotating the ratchet gear 91. The specific configuration of the electric charging mechanism 90 will be described in detail later.

[0060] An arm-side roller 24b is provided at the other end of the charge arm 24, and the arm-side roller 24b abuts against a cam surface 22b of the charge cam 22. When the charge cam 22 rotates, the arm-side roller 24b moves along the cam surface 22b.

[0061] The mechanism system 7 also includes a first close latch 25 whose base end is rotatably supported on the shared fixed shaft 24a, a second close latch 26 whose base end is rotatably supported on a fixed shaft 26a, and a close bar 27, a portion of which is formed into a semi-cylindrical shape.

[0062] The charging cam 22 has a cam side roller 22a provided between it and the ratchet gear 91, and the tip of the first close latch 25 abuts against the cam side roller 22a. A latch side roller 25a is provided midway between the base end and the tip of the first close latch 25, and the latch side roller 25a abuts against one end of the second close latch 26.

[0063] A protrusion 26b and an engagement portion 26c are formed at one end of the second close latch 26. The second close latch 26 receives a counterclockwise force in FIG. 7 from a return spring (not shown), so the protrusion 26b tries to rotate the first close latch 25 clockwise. When the circuit breaker 1 is in the state shown in FIG. 7, the first close latch 25 is in contact with the cam side roller 22a, and the cam side roller 22a acts as a stopper to hold the first close latch 25 in a state where it cannot rotate. The close bar 27 is rotated clockwise manually by an on button (not shown) or by an on operation using a solenoid or the like.

[0064] As shown in FIG. 9, the mechanism system 7 includes a main shaft 28, an insulating link arm 28a fixed to the main shaft 28, and a second link arm 28b fixed to the main shaft 28 and disposed between the insulating link arms 28a. The main shaft 28 is rotatably supported by the frame 16. Three insulating link arms 28a are disposed on the main shaft 28 with their base ends spaced equally apart along the extension direction. The insulating link arms 28a and the second link arms 28b have the same shape. The insulating link arm 28a is rotatably connected to one end of an insulating link 41 shown in FIG. 10 by a pin (not shown). The other end of the insulating link 41 is connected to a movable contact 43.

[0065] As shown in Figures 7 and 10, the mechanism system 7 includes a closing toggle link mechanism 29, a link lever 30 rotatably supported on a fixed shaft 30a, a trip latch 31 rotatably supported on a fixed shaft 26a, and a trip bar 32 that engages with one end of the trip latch 31.

[0066] The closing toggle link mechanism 29 includes a first link 29a, a second link 29b, and pins 29c and 29d. One end of the first link 29a is rotatably connected to one end of the link lever 30 by a pin 30b. The other end of the first link 29a and one end of the second link 29b are connected by a pin 29d. The other end of the second link 29b is connected to the other end of the second link arm 28b by a pin 29c. A lever-side roller 30c is provided on the link lever 30 midway between the one end and the center of rotation. A side surface of the trip latch 31 engages with the lever-side roller 30c.

[0067] When an on button (not shown) is pressed in the state shown in Fig. 7, the close bar 27 rotates clockwise, and the second close latch 26 locked by the close bar 27 is released. The unlocked second close latch 26 rotates clockwise in Fig. 7, and the engagement between the engagement portion 26c and the latch side roller 25a is released. Therefore, the charge cam 22 rotates counterclockwise in Fig. 7 while rotating the first close latch 25 counterclockwise in Fig. 7 by the cam side roller 22a, and the arm side roller 24b falls into the step portion of the cam surface 22b of the charge cam 22. As a result, the charge arm 24 becomes free.

[0068] When the charge arm 24 becomes free, it rotates counterclockwise in Fig. 7 due to the release force of the closing spring 18, and the operating surface 24c bounces up the link side roller 29e of the closing toggle link mechanism 29. Because the trip latch 31 is locked from moving counterclockwise in Fig. 7 by the trip bar 32, the closing toggle link mechanism 29 extends, causing the second link arm 28b to rotate counterclockwise in Fig. 7.

[0069] 11 and 12, the movable contact 43a and the fixed contact 44a come into contact with each other in the circuit breaker 1, and the electric circuit is closed. In the state shown in Fig. 11, a clockwise rotational force in Fig. 11 is applied to the link lever 30 by the contact pressure spring 47 via the closing toggle link mechanism 29 and the pin 30b, but the trip bar 32 prevents the link lever 30 from rotating counterclockwise in Fig. 11.

[0070] In the tripped state in which the closing spring 18 is released as shown in Fig. 11, when the ratchet gear 91 in the electric charging mechanism 90 is driven to rotate counterclockwise in Fig. 11, the charging cam 22 rotates counterclockwise in Fig. 11. This causes the charge arm 24 to rotate clockwise about the camshaft 21 to the position shown in Fig. 7 in Fig. 11, and the spring hook pin 24d presses down on the closing spring 18, thereby storing energy in the closing spring 18. In this way, the closing spring 18 reaches the fully-charged state shown in Figs. 7 and 10.

[0071] Next, the configuration of the electric charging mechanism 90 will be specifically described. Fig. 13 is a side view showing an example of the electric charging mechanism 90 according to the second embodiment. Fig. 14 is an exploded front view showing the state before assembly of the electric charging mechanism 90 according to the second embodiment. Fig. 15 is a front view showing the state after assembly of the electric charging mechanism 90 according to the second embodiment. Note that Fig. 14 does not show a part of the configuration of the electric charging mechanism 90 including the ratchet gear 91.

[0072] As shown in Fig. 13, the electric charging mechanism 90 includes a ratchet gear 91 having a plurality of gear teeth 91a formed thereon, a feed pawl 92, a reverse rotation prevention pawl 93, and springs 96 and 98. The ratchet gear 91 is biased clockwise in Fig. 13 by a closing spring 18 via a charge arm 24, a charging cam 22, and a camshaft 21. Hereinafter, the direction in which the ratchet gear 91 rotates due to the bias of the closing spring 18 may be referred to as the biasing direction.

[0073] The feed pawl 92 has a tip end 92a which engages with the gear teeth 91a of the ratchet gear 91. A spring 96 is stretched between the base end of the feed pawl 92 and the frame 16, and biases the feed pawl 92 in a counterclockwise direction in FIG.

[0074] The base end of the anti-reverse pawl 93 is rotatably attached to the frame 16. The anti-reverse pawl 93 is biased counterclockwise in FIG. 13 by a spring 98, and the tip end 93a engages with the gear teeth 91a of the ratchet gear 91. As a result, the anti-reverse pawl 93 restricts the rotation of the ratchet gear 91 in the biasing direction. However, the anti-reverse pawl 93 does not restrict the rotation of the ratchet gear 91 in the opposite direction to the biasing direction.

[0075] 14 and 15, the electric charging mechanism 90 has a frame 97 and a motor unit 94 attached to the frame 97. The motor unit 94 is composed of a motor body 94a, a bracket 94b made of an insulating material and holding the motor body 94a, an insulating gear 94d made of an insulating material and transmitting the rotational force of an output shaft 94c of the motor body 94a to the feed jaws 92, a motor body mounting screw 94e for fixing the motor body 94a fitted in the bracket 94b to the bracket 94b, and a motor unit mounting screw 94f for fixing the bracket 94b holding the motor body 94a to the frame 97.

[0076] The electric charging mechanism 90 also includes a transmission mechanism 95 that transmits the rotational force of the insulating gear 94d to the feed jaw 92. The motor body 94a is a DC motor that rotates an output shaft 94c by DC power.

[0077] The transmission mechanism 95 includes a reduction gear 95a having an input side gear attached to an output shaft 94c of a motor body 94a, and a rotating member 95b attached to the output shaft 95c of the reduction gear 95a and rotating about the output shaft 95c. The base end of the feed jaw 92 is rotatably attached to a position shifted from the rotation center of the rotating member 95b.

[0078] The rotating member 95b is biased in a counterclockwise direction in Fig. 13 around the output shaft 95c by a spring 96 shown in Fig. 13. When the output shaft 94c of the motor body 94a rotates, which rotates the output shaft 95c of the reduction gear 95a, the rotating member 95b rotates in a counterclockwise direction in Fig. 13. When the rotating member 95b rotates in a counterclockwise direction in Fig. 13, the feed pawl 92 repeats a reciprocating curved motion similar to that of a circular arc slider crank a plurality of times, causing the feed pawl 92 to rotate the ratchet gear 91.

[0079] Thus, in the electric charging mechanism 90, the motor body 94a has an output shaft 94c attached via an insulating gear 94d to a transmission mechanism 95 provided between the motor body 94a and the feed pawl 92, and the rotation of the output shaft 94c reciprocates the feed pawl 92 via the transmission mechanism 95. This causes the ratchet gear 91 to rotate in the opposite direction to the biasing direction.

[0080] Next, the circuit configuration of the electric charging device that drives the motor main body 94a will be described. The functional block diagram of the electric charging device of the second embodiment is the same as that of FIG. 1. In the second embodiment, the circuit configuration of the main power supply shown in FIG. 1 differs from that of the first embodiment. FIG. 16 is a circuit diagram showing the configuration of a main power supply 214 of the electric charging device of the circuit breaker according to the second embodiment. The main power supply 204 of the first embodiment was an insulated power supply equipped with a transformer 204a, but the main power supply 214 in the second embodiment is a non-insulated power supply without a transformer.

[0081] As shown in Fig. 16, the main power supply 214 includes a FET 214a, a resistor 214b, a resistor 214c, a control circuit 214d, a diode 214e, a coil 214f, a capacitor 214g, a diode 214h, a diode 214i, and a resistor 214j. The drain of the FET 214a is connected to the rectifier circuit 202. One end of the resistor 214b is connected to the drain of the FET 214a, and the other end is connected to the gate of the FET 214a. One end of the resistor 214c is connected to the gate of the FET 214a. The control circuit 214d has an output terminal connected to the other end of the resistor 214c, and performs switching control of the FET 214a. The cathode of the diode 214e is connected to the source of the FET 214a, and the anode is connected to ground. One end of the coil 214f ​​is connected to the source of the FET 214a, and the other end is the output of the main power supply 214. One end of the capacitor 214g is connected to the other end of the coil 214f, and the other end is connected to ground. The diode 214h has an anode connected to the output of the main power supply 214, and a cathode connected to a power supply terminal of the control circuit 214d. The diode 214i has an anode connected to the output of the sub-power supply 205, and a cathode connected to a power supply terminal of the control circuit 214d. The resistor 214j has one end connected to a power supply terminal of the control circuit 214d, and the other end connected to a control terminal of the control circuit 214d. The control terminal of the control circuit 214d is connected to the main power supply off circuit 209.

[0082] Next, the operation of the main power supply 214 will be described. The main power supply 214 is a chopper type power supply. The DC voltage output from the rectifier circuit 202 causes the FET 214a to perform a switching operation by the control output of the control circuit 214d, thereby intermittently applying a voltage to the coil 214f. The voltage applied to the coil 214f ​​is stepped down to a DC voltage of, for example, DC 24V by the coil 214f, the diode 214e, and the capacitor 214g.

[0083] Similarly to the first embodiment, the output voltage of the main power supply 214 is supplied to the power supply terminal of the control circuit 214d via a diode 214h, and the output voltage of the sub power supply 205 is supplied to the power supply terminal of the control circuit 214d via a diode 214i. The resistor 214j is for pulling up the control terminal of the control circuit 214d, and when the transistor 209a of the main power supply off circuit 209 is turned ON, the control terminal of the control circuit 214d goes to low level and the output terminal of the control circuit 214d stops operating.

[0084] Thus, according to the second embodiment, since the main power supply 214 is of a non-insulated type, by providing insulation between the motor 203 and the frame that holds the motor 203, and between the gear driven by the motor 203 and the charge mechanism of the circuit breaker, it is possible to eliminate the need for a double-pole power relay.

[0085] In the second embodiment, main power supply 214 is a non-insulated type, and motor 203 is insulated from the charging mechanism. However, motor 203 may be insulated from the charging mechanism, and the main power supply may be an insulated type power supply as described in the first embodiment.

[0086] Embodiment 3 The first and second embodiments are examples of charge priority circuit configurations in which microswitch 207 is turned ON when charging is complete, whereas the third embodiment is an OFF priority circuit in which microswitch 307 is turned OFF when charging is complete, and is configured without using a sub-power supply.

[0087] Fig. 17 is a functional block diagram showing the configuration of an electric charging device according to a third embodiment. Fig. 18 is a circuit diagram showing the configuration of a main power supply of an electric charging device according to a third embodiment. Fig. 19 is a circuit diagram showing the configuration of a motor drive circuit of an electric charging device according to a third embodiment. Fig. 20 is a circuit diagram showing the configuration of a timer circuit of an electric charging device according to a third embodiment.

[0088] As shown in FIG. 17, the electric charging device 300 in the third embodiment includes a rectifier circuit 202, a main power supply 304, a diode 310, a microswitch 307, a resistor 312, a diode 311, a motor drive circuit 306, a timer circuit 308, and a diode 309. The main power supply 304 is connected to the output side of the rectifier circuit 202. The anode of the diode 310 is connected to the output of the main power supply 304. The microswitch 307 has one end connected to the cathode of the diode 310 and the other end connected to the main power supply 304. The resistor 312 has one end connected to the output side of the rectifier circuit 202. The anode of the diode 311 is connected to the other end of the resistor 312 and the cathode is connected to one end of the microswitch 307. The motor drive circuit 306 is connected to the output of the main power supply 304 and drives the motor 203. The timer circuit 308 is connected to the output of the main power supply 304 via a diode 309, and stops the motor 203 if the microswitch 307 does not turn off even after a set time has elapsed after the motor 203 has been driven.

[0089] Microswitch 307 in the third embodiment differs from microswitch 207 in the first embodiment in that it has a contact that turns ON when charging of the closing spring begins and turns OFF when charging of the closing spring is completed.

[0090] As shown in Fig. 18, the main power supply 304 has almost the same circuit configuration as the main power supply 204 described in Fig. 2, but the power supply supplied to the power supply terminal of the control circuit 304c is different. In the third embodiment, instead of using the sub-power supply 205 described in the first embodiment, the output voltage of the rectifier circuit 202 is divided by a resistor 312, and the divided voltage is supplied to the control circuit 304c of the main power supply 304 via a diode 311 and a microswitch 307, thereby operating the control circuit 304c at the time of start-up immediately after the AC power supply 201 is turned on.

[0091] The transformer 304a, FET 304b, control circuit 304c, diode 304d, resistor 304e, capacitor 304f, resistor 304g, resistor 304h, diode 304i, and smoothing capacitor 304j shown in Fig. 18 correspond to the transformer 204a, FET 204b, control circuit 204c, diode 204d, resistor 204e, capacitor 204f, resistor 204g, resistor 204h, diode 204i, and smoothing capacitor 204j shown in Fig. 2. The difference from Fig. 2 is that the diode 204k and the diode 204m are deleted, and the other end of the microswitch 307 is connected to the power supply terminal of the control circuit 304c. The operation of these circuits is the same as that of Fig. 2, so a description thereof will be omitted.

[0092] In the third embodiment, the switching is directly stopped by turning on and off the voltage supply to the control circuit 304c of the main power supply 304 using the microswitch 307. In this case, however, in addition to the OFF taking priority, the refresh operation of the microswitch 307 and the stability of the stop time due to differences in the input voltage are lost.

[0093] As shown in Fig. 19, the motor drive circuit 306 has almost the same circuit configuration as the motor drive circuit 206 described in Fig. 4, but the diode 206f and the resistor 206h are deleted. The FET 306a, resistor 306b, resistor 306c, transistor 306d, resistor 306e, diode 306g, resistor 306i, and freewheeling diode 306j shown in Fig. 19 correspond to the FET 206a, resistor 206b, resistor 206c, transistor 206d, resistor 206e, diode 206g, resistor 206i, and freewheeling diode 206j shown in Fig. 4. The operation of these circuits is the same as that of Fig. 4, so a description of the operation will be omitted.

[0094] As shown in Fig. 20, timer circuit 308 has almost the same circuit configuration as timer circuit 208 described in Fig. 5, but diode 208n and resistor 208q are deleted. Timer section 308a, transistor 308b, resistor 308c, resistor 308d, transistor 308e, resistor 308f, resistor 308g, thyristor 308h, resistor 308i, transistor 308j, resistor 308k, resistor 308m, diode 308p, and resistor 308r shown in Fig. 20 correspond to timer section 208a, transistor 208b, resistor 208c, resistor 208d, transistor 208e, resistor 208f, resistor 208g, thyristor 208h, resistor 208i, transistor 208j, resistor 208k, resistor 208m, diode 208p, and resistor 208r shown in Fig. 5. Timer capacitor 308a1, diode 308a2, discharge resistor 308a3, transistor 308a4, resistor 308a5, Zener diode 308a6, and charge resistor 308a7 in timer section 308a in Fig. 20 correspond to timer capacitor 208a1, diode 208a2, discharge resistor 208a3, transistor 208a4, resistor 208a5, Zener diode 208a6, and charge resistor 208a7 in timer section 208a in Fig. 5. Since the operation of these circuits is similar to that in Fig. 5, a description of the operation will be omitted.

[0095] According to the third embodiment, by giving priority to the OFF state in which microswitch 307 is turned OFF when charging is completed, it is possible to eliminate the need for a double-pole power relay even without having a sub-power supply.

[0096] Incidentally, in the above explanation, an electric charging device for closing an air circuit breaker has been described, but the present invention can also be applied to other devices having a configuration using a motor drive, such as an electric operating device for operating the handle of a circuit breaker.

[0097] The configurations shown in the above embodiments are examples of the contents of the present disclosure, and may be combined with other known technologies, and parts of the configurations may be omitted or modified without departing from the gist of the present disclosure. [Explanation of symbols]

[0098] 1 circuit breaker, 4 arc extinguishing chamber, 6 electrical system, 7 mechanical system, 10 housing, 10a molded case, 10b molded cover, 16, 16a, 16b, 97 frame, 16c long hole, 17 guide plate, 21 camshaft, 22 charge cam, 22a cam side roller, 22b cam surface, 24 charge arm, 24a shared fixed shaft, 24b arm side roller, 24c operating surface, 24d spring hook pin, 25 first close latch, 25a latch side roller, 26 second close latch, 26a, 30a fixed shaft, 26b protrusion, 26c engagement portion, 27 close bar, 28 main shaft, 28a insulating link arm, 29 closing toggle link mechanism, 29c, 29d, 30b pin, 29e link side roller, 30 link lever, 30c Lever side roller, 31 trip latch, 32 trip bar, 41 insulating link, 42 ​​load side fixed conductor, 43 moving contact, 43a moving contact, 44 power supply side fixed conductor, 44a fixed contact, 45 flexible conductor, 46 moving contact holder, 48 holder shaft, 49 connecting pin, 82 nut, 90 electric charging mechanism, 91 ratchet gear, 91a gear teeth, 92 feed pawl, 92a, 93a tip, 94 motor, 94a motor body, 94b bracket, 94c, 95c output shaft, 94d insulating gear, 95 transmission mechanism, 95a reduction gear, 95b rotating member, 200, 300 electric charging device, 201 AC power source, 202 rectifier circuit, 203 motor, 204, 214, 304 main power source, 204a, 304a Transformer, 204b, 304b FET, 204c, 214d, 304c Control circuit, 204d, 204i, 204k, 204m, 205b, 205f, 206f, 206g, 206j, 208a2, 208n, 208p, 210, 211, 214e, 214h, 214i, 304d, 304i, 306g, 306j, 308a2, 308p, 309, 310, 311 Diodes, 204e, 204g, 204h, 204n, 205c, 205e, 206b, 206c, 206e, 206h, 206i, 208a5, 208c, 208d, 208f, 208g, 208i, 208k, 208m, 208q, 208r, 209b, 209d, 214b, 214c, 214j, 304e, 304g, 304h, 306b, 306c, 306e,306i, 308a5, 308c, 308d, 308f, 308g, 308i, 308k, 308m, 308r, 312 resistors, 204f, 205h, 214g, 304f capacitors, 204j, 304j smoothing capacitors, 205 sub-power supplies, 205d, 205g, 208a6, 308a6 Zener diodes, 206, 306 motor drive circuits, 206d, 208a4, 208b, 208e, 208j, 209a, 209c, 306d, 308a4, 308b, 308e, 308j transistors, 207, 307 microswitches, 208, 308 timer circuits, 208a, 308a Timer section, 208a1, 308a1 timer capacitor, 208a3, 308a3 discharge resistor, 208a7, 308a7 charge resistor, 208h, 308h thyristor, 209 main power off circuit, 214f ​​coil.

Claims

1. a main power supply that supplies power to a motor that charges the closing spring of the circuit breaker; a first switch having a contact turned on when the completion of charging of the closing spring is detected; a main power supply off circuit that stops the operation of the main power supply when the first switch detects the completion of charging; a motor drive circuit having a first switching element connected in series to the motor, the motor drive circuit turning off the first switching element when the first switch detects the completion of charging; Equipped with The main power supply off circuit and the motor drive circuit are supplied with power from the main power supply via the contact of the first switch when the first switch detects the completion of charging.

1. An electric charging device for a circuit breaker.

2. a sub-power supply having an output voltage lower than that of the main power supply; The main power supply off circuit and the motor drive circuit are supplied with power from the main power supply and the sub power supply via the contact of the first switch when the first switch detects the completion of charging.

2. The circuit breaker electric charging device according to claim 1.

3. a first capacitor that is charged while the motor is being driven and that is discharged when the first switch detects the completion of the charging; an off-holding circuit that holds the first switching element of the motor drive circuit off when the voltage of the first capacitor becomes greater than a first value; A timer circuit having 3. The electric charging device for a circuit breaker according to claim 1, further comprising:

4. the main power supply is an insulated power supply having a transformer, and is a switching power supply that generates a secondary voltage on a secondary side of the transformer by switching operation; The main power supply off circuit stops the switching operation, thereby stopping the operation of the main power supply when the first switch detects the completion of charging.

4. The electric charging device for a circuit breaker according to claim 1,

5. The main power supply is a non-insulated power supply that does not have a transformer, The motor is electrically insulated from a charging mechanism for charging the closing spring.

4. The electric charging device for a circuit breaker according to claim 1,

6. a main power supply that supplies power to a motor that charges the closing spring of the circuit breaker; a first switch having a contact that is turned on when the charging of the closing spring starts and that is turned off when the charging completion is detected; a main power supply off circuit that stops the operation of the main power supply when the first switch detects the completion of charging; A first switching element connected in series to the motor; a motor drive circuit that turns off the first switching element when the first switch detects the completion of charging; An electric charging device for a circuit breaker comprising:

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