Minitype residual current protective circuit
A technology of residual current and protection circuit, applied in emergency protection circuit devices, circuit devices, emergency protection devices with automatic disconnection, etc. Easy to burn out and other problems, to achieve the effect of low anti-pulse ability, high anti-electromagnetic compatibility characteristics, and low production cost
Inactive Publication Date: 2015-04-29
CNC ELECTRIC GRP
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Problems solved by technology
[0002] The traditional small residual current protection circuit adopts single-phase power supply, and its shortcoming is that when one of the power supply phases is missing, the residual current protection function is lost; there is no external voltage regulator circuit, and its shortcoming is that the product has low ability to resist pulse groups, which is easy to cause The phenomenon of false tripping; the tripping coil L is connected in series with the AC high-voltage end, its disadvantage is that when the residual current protection is turned on, once the circuit breaker mechanism is stuck or the tripping time is relatively long, the tripping coil L is easy to burn out
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[0015] see figure 1 , is the schematic diagram of the traditional small residual current protection circuit. Such as figure 1 As shown, the disadvantage of using a single-phase power supply for power supply is that when one of the power supply phases is missing, the residual current protection function will be lost; there is no external voltage regulator circuit, and its disadvantage is that the product has low ability to resist pulse groups, which may easily lead to false tripping. ;The tripping coil L is connected in series with the AC high-voltage end. The disadvantage is that when the residual current protection is turned on, the tripping coil L is easy to burn out once the circuit breaker mechanism is stuck or the tripping time is relatively long.
[0016] Please refer to figure 2 ,for figure 2 It is the circuit schematic diagram of the first embodiment of the small residual current protection circuit of the present invention. Such as figure 2 As shown, in the fir...
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The invention relates to a minitype residual current protective circuit. The minitype residual current protective circuit comprises a power circuit, a residual current signal conditioning circuit, a residual current detection control unit, a residual current detection control unit required circuit, a residual current testing circuit and a tripping circuit, wherein the power circuit, the residual current signal conditioning circuit, the residual current detection control unit, the residual current detection control unit required circuit, the residual current testing unit and the tripping circuit are connected in sequence, the power circuit comprises a surge suppression circuit, a full-wave rectification circuit, a resistance reduction voltage circuit, an external connection voltage stabilizing circuit and a filter circuit; the residual current signal conditioning circuit comprises a resistance R5, a resistance R6, a resistance R7, a capacitance C2, a capacitance C3, a capacitance C4, a capacitance C5 and a diode D9; the residual current detection control unit comprises a residual current detection integrated circuit; the residual current detection control unit required circuit comprises a capacitance C6, a capacitance C7 and a capacitance C8; the residual current testing circuit comprises a resistance R3. The whole circuit is simple in design, high in anti-electromagnetic compatibility, low in production cost, and very suitable for actual demands of the market.
Description
technical field [0001] The present invention relates to the technical field of protection circuits, more specifically, to a small residual current protection circuit. Background technique [0002] The traditional small residual current protection circuit adopts single-phase power supply, and its shortcoming is that when one of the power supply phases is missing, the residual current protection function is lost; there is no external voltage regulator circuit, and its shortcoming is that the product has low ability to resist pulse groups, which is easy to cause The phenomenon of false tripping; the tripping coil L is connected in series with the AC high voltage end, its disadvantage is that when the residual current protection is turned on, once the circuit breaker mechanism is stuck or the tripping time is relatively long, the tripping coil L is easy to burn out. [0003] Therefore, prior art urgently needs to have very big progress. Contents of the invention [0004] The ...
Claims
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IPC IPC(8): H02H3/253
Inventor 余存泰肖义峰章火明李其利彭昆明
Owner CNC ELECTRIC GRP