Residual current detection and protection control circuit
A residual current and protection control technology, applied in emergency protection circuit devices, circuit devices, emergency protection devices with automatic disconnection, etc., can solve the problems of high reverse withstand voltage value, difficult mass production of shunt circuits, etc. The effect of reducing the withstand voltage value, high anti-electromagnetic compatibility characteristics, and reliable and stable mass production
Active Publication Date: 2018-07-03
长城电器集团浙江科技有限公司
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Problems solved by technology
Since the shunt circuit is difficult to reliably and stably realize the residual current of 30mA in mass production, the common processing method is to replace the shunt circuit with a 30mA integrated circuit; and the power supply circuit generally adopts the full-wave rectification method, which leads to the requirement of switching elements Has a high reverse withstand voltage value
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[0010] see figure 1 , is the schematic circuit diagram of the first embodiment of the residual current detection and protection control circuit of the present invention. Such as figure 1 As shown, in the residual current detection and protection control circuit provided in the first embodiment of the present invention, it at least includes a power supply input, a power supply circuit connected in sequence, a residual current tripping control circuit and a residual current detection circuit; wherein the power supply The circuit includes a varistor MYR, a diode D4, a release L1, the live wire terminal L is connected to the anode of the diode D4, the neutral terminal N is connected to one end of the release L1, and the other end of the release L1 is connected to the varistor One end of MYR is connected, and the other end of varistor MYR is connected to the anode of diode D4; the residual current tripping control circuit includes resistors R2, R4, R5, R6, R7, thyristor D2, D3, ca...
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The invention relates to an aftercurrent detection and protection control circuit. The aftercurrent detection and protection control circuit has the advantages that a power source circuit of the aftercurrent detection and protection control circuit adopts a half-wave rectification mode, reverse voltage withstanding of switch components of the integral control circuit is reduced by more than a half, and three diodes are omitted, which let the PCB design be simpler; the aftercurrent detecting circuit is in the design with a protection diode D5 and a pi-type filter circuit, and more stable and reliable aftercurrent signals are guaranteed; massive production of the aftercurrent at 30mA level can be more reliably and stably realized by effective matching of an aftercurrent trip control circuit and an aftercurrent detecting circuit. The aftercurrent detection and protection control circuit is simple in design, high in anti-electromagnetic compatibility characteristics, low in cost and very applicable to massive production.
Description
technical field [0001] The present invention relates to the technical field of residual current detection and protection, and more specifically, to a residual current detection and protection control circuit. Background technique [0002] Currently, residual current dedicated chips (also known as integrated circuits) or shunt circuits are commonly used in residual current protection circuits to implement residual current protection. Due to the high cost of integrated circuits and relatively complex circuits, they are mostly used in places with high requirements for power consumption. Conventionally, shunt circuits are mainly used. Since the shunt circuit is difficult to reliably and stably realize the residual current of 30mA in mass production, the common processing method is to replace the shunt circuit with a 30mA integrated circuit; and the power supply circuit generally adopts the full-wave rectification method, which leads to the requirement of switching elements Has ...
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IPC IPC(8): H02H3/00H02H3/02
Inventor 余存泰肖义峰章火明李其利彭昆明
Owner 长城电器集团浙江科技有限公司