断路器的供电控制电路、断路器及供电系统

Abstract

本实用新型提供一种断路器的供电控制电路、断路器及供电系统，断路器的供电控制电路包括整流模块、控制模块、充放电模块、超级电容和可充电电池；充放电模块用于在控制模块的控制下，控制超级电容和 / 或可充电电池进行充电或放电。首先，在控制模块的控制下，当电流互感器感应的目标电流的电流值较小时，可控制超级电容放电来使脱扣模块中的脱扣线圈快速完成储能，保障脱扣模块能够在短时间内具备正常动作的能力；其次，在控制模块的控制下，当电流互感器感应的目标电流的电流值较大时，可控制可充电电池充电来吸收过剩的能量，避免频繁泄放而导致电流互感器频繁发热，降低电流互感器烧毁的风险。

Claims

1. A power supply control circuit for a circuit breaker, characterized by, The power supply control circuit of the circuit breaker includes a rectifier module, a control module, a charging and discharging module, a supercapacitor, and a rechargeable battery. The input terminal of the rectifier module is used to be electrically connected to the current transformer. The first access terminal of the charging and discharging module is electrically connected to the output terminal of the rectifier module and the power supply terminal of the control module, and is also used to be electrically connected to the power supply terminal of the tripping module. The second access terminal of the charging and discharging module is electrically connected to the supercapacitor. The third access terminal of the charging and discharging module is electrically connected to the rechargeable battery. The output terminal of the control module is electrically connected to the controlled terminal of the charging and discharging module. The charging and discharging module is used to control the supercapacitor and / or rechargeable battery to charge or discharge under the control of the control module.

2. The power supply control circuit of claim 1, wherein, The charging and discharging module includes a bidirectional DC-DC conversion unit and a channel switching unit; The first input terminal of the bidirectional DC-DC converter is electrically connected to the output terminal of the rectifier module and the power supply terminal of the control module, respectively. The second input terminal of the bidirectional DC-DC converter is electrically connected to the supercapacitor and the rechargeable battery through the channel switching unit, respectively. The controlled terminal of the bidirectional DC-DC converter is electrically connected to the first output terminal of the control module, and the controlled terminal of the channel switching unit is electrically connected to the second output terminal of the control module. The channel switching unit is used to connect the supercapacitor and / or rechargeable battery to the bidirectional DC-DC conversion unit under the control of the control module. The bidirectional DC-DC converter unit is used, under the control of the control module, to control the supercapacitor and / or rechargeable battery to charge or discharge based on the channel state of the channel switching unit.

3. The power supply control circuit of claim 2, wherein, The channel switching unit includes a MOS transistor array, which is composed of multiple MOS transistors. The first access terminal of the MOS transistor array is electrically connected to the second access terminal of the bidirectional DC-DC converter unit, the second access terminal of the MOS transistor array is electrically connected to the supercapacitor, the third access terminal of the MOS transistor array is electrically connected to the rechargeable battery, and the controlled terminal of the MOS transistor array is electrically connected to the second output terminal of the control module.

4. The power supply control circuit of claim 1, wherein, The power supply control circuit of the circuit breaker also includes a power replenishment module; The first access terminal of the power replenishment module is electrically connected to the rechargeable battery, the second access terminal of the power replenishment module is electrically connected to the supercapacitor, and the controlled terminal of the power replenishment module is electrically connected to the third output terminal of the control module. The charging module is used to control the rechargeable battery to charge the supercapacitor under the control of the control module.

5. The power supply control circuit of claim 4, wherein, The power replenishment module includes a unidirectional DC-DC conversion unit; The input terminal of the unidirectional DC-DC converter is electrically connected to the rechargeable battery, the output terminal of the unidirectional DC-DC converter is electrically connected to the supercapacitor, and the controlled terminal of the unidirectional DC-DC converter is electrically connected to the third output terminal of the control module.

6. The power supply control circuit of claim 1, wherein, The power supply control circuit of the circuit breaker also includes a discharge module; The first access terminal of the discharge module is electrically connected to the power supply terminal of the rectifier module, the first access terminal of the charging and discharging module, and the control module, respectively, and the second access terminal of the discharge module is used for grounding; The discharge module is used to discharge the energy output by the rectifier module.

7. The power supply control circuit of claim 6, wherein, The discharge module includes a controllable switch and a discharge resistor connected in series, and the controlled terminal of the controllable switch is electrically connected to the fourth output terminal of the control module. The end of the controllable switch away from the bleed resistor is electrically connected to the power supply terminal of the rectifier module, the first terminal of the charge / discharge module, and the control module, respectively, and the end of the bleed resistor away from the controllable switch is used for grounding; or, the end of the bleed resistor away from the controllable switch is electrically connected to the power supply terminal of the rectifier module, the first terminal of the charge / discharge module, and the control module, respectively, and the end of the controllable switch away from the bleed resistor is used for grounding; The controllable switch is used to discharge the energy output by the rectifier module through the discharge resistor when it is in the closed state under the control of the control module.

8. The power supply control circuit of claim 1, wherein, The rechargeable battery includes a lithium thionyl chloride battery.

9. A circuit breaker characterized by, It includes a current transformer, a tripping module, and a power supply control circuit for the circuit breaker as described in any one of claims 1 to 8.

10. A power supply system characterized by comprising: Includes power lines and the circuit breaker as described in claim 9; The current transformer is used to sense the target current on the power line. The tripping module is used to control the on / off state of the power line.

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