Minitype residual current circuit breaker protective circuit
A leakage circuit breaker and protection circuit technology, applied in emergency protection circuit devices, electrical components and other directions, can solve the problems of inconvenient distribution box coordination, unfavorable actual needs, and high production costs, and achieve stable and reliable leakage signal detection. The effect of high electromagnetic compatibility and low production cost
Inactive Publication Date: 2015-04-29
CNC ELECTRIC GRP
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Problems solved by technology
[0002] If the traditional small leakage circuit breaker needs to be equipped with an overvoltage protection function, the product needs to be equipped with a dedicated overvoltage protection module. The disadvantages: 1. The volume is larger than the original small leakage circuit breaker, which is inconvenient to be assembled with the distribution box. 2. High production cost, which is not conducive to the actual demand of the market
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Embodiment Construction
[0009] see figure 1 , is the circuit principle diagram of the first embodiment of the protection circuit of the small leakage circuit breaker of the present invention. Such as figure 1 As shown, in the small earth leakage circuit breaker protection circuit provided by the first embodiment of the present invention, at least including, power input, sequentially connected: power supply circuit, leakage and overvoltage tripping control circuit, leakage detection circuit and overvoltage detection circuit ;
[0010] Wherein, the power supply circuit includes a diode D3 connected in series, a varistor MYR, and a release L1, and the release L1 is placed before the varistor MYR; the leakage and tripping control circuit includes a series connection of resistors R5, Capacitor C2, thyristor D2; leakage detection circuit includes sampling resistor R0, sampling resistor R1, Zener diode D1, L-shaped filter circuit including resistor R2, capacitor C1, sampling resistor R0, sampling resistor...
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The invention relates to a minitype residual current circuit breaker protective circuit. The minitype residual current circuit breaker protective circuit comprises a power input. The minitype residual current circuit breaker protective circuit further comprises a power circuit, an electric leakage and an overvoltage tripping control circuit, an electric leakage detection circuit and an overvoltage detection circuit connecting in sequence, wherein the power circuit comprises a diode D3, a voltage dependent resistor MYR and a tripper L1, and the diode D3, the voltage dependent resistor MYR and the tripper L1 are connected in series; the tripper L1 is arranged in the front of the voltage dependent resistor MYR; the electric leakage and overvoltage tripping control circuit comprises a resistance R5, a capacitance C2 and controllable silicon D2, and the resistance R5, the capacitance C2 and the controllable silicon D2 are connected in series; the electric leakage detection circuit comprises a sampling resistance R0, a sampling resistance R1, a voltage stabilization diode D1 and an L-shaped filter circuit which comprises a resistance R2 and a capacitance C1; the overvoltage detection circuit comprises a resistance R3, a capacitance R4 and a bidirectional trigger diode D4. Electric leakage signal detection is stable and reliable; the whole circuit is simple in design, high in anti-electromagnetic compatibility, small in size, low in production cost, and very suitable for actual demands of the market.
Description
technical field [0001] The invention relates to the technical field of electrical breakers, and more specifically relates to a small leakage circuit breaker protection circuit. Background technique [0002] If the traditional small leakage circuit breaker needs to be equipped with an overvoltage protection function, the product needs to be equipped with a dedicated overvoltage protection module. The disadvantages: 1. The volume is larger than the original small leakage circuit breaker, which is inconvenient to be assembled with the distribution box. 2. The production cost is high, which is not conducive to the actual demand of the market. [0003] Therefore, prior art urgently needs to have very big progress. Contents of the invention [0004] The technical problem to be solved by the present invention is to provide a small leakage circuit breaker protection circuit for the above-mentioned defects of the prior art, including: power input, and the small leakage circuit bre...
Claims
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Inventor 余存泰肖义峰章火明李其利彭昆明
Owner CNC ELECTRIC GRP