Voltage and current switchable type electric leakage protection device
A leakage protection device, voltage and current technology, applied in the direction of emergency protection circuit devices, circuit devices, emergency protection devices with automatic disconnection, etc., can solve the problems of staying in the principle stage, poor anti-interference of the detection circuit, high input impedance, etc., to achieve Improve anti-interference, good anti-interference effect
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[0017] Example 1
[0018] like figure 1 As shown in the circuit schematic diagram, the voltage and current switchable leakage protection device of the present invention includes a trip unit L1, a rectifier diode D1, a thyristor SCR1, an indicator circuit composed of LED1 and a resistor R1, and a step-down circuit composed of a resistor R2. Composition, the first amplifier circuit IC1, the zero sequence current transformer ZCT1, the test circuit is composed of the switch K1 and the resistor R3, the second amplifier circuit IC2 and the over-temperature detection circuit (consisting of the voltage reference source U1, resistor R4, resistor R5, resistor R6 , transistor Q1 and thermistor RT), the second amplifier circuit IC2 is also provided with a ground wire current transformer ZCT2 and a ground wire voltage detection circuit; the ground wire voltage detection circuit includes a first capacitor C4, a second capacitor C5, the third capacitor C6 and the adjusting resistor R7; one ...
Example Embodiment
[0032] Embodiment 2
[0033] The principles and beneficial effects of this embodiment and the first embodiment are basically the same, and the differences are: figure 2 As shown, the ground voltage detection circuit is further provided with a fourth capacitor C7 and a diode D4, the first to fourth capacitors form a capacitor bridge, and the common terminal of the first capacitor C4 and the fourth capacitor C7 is connected to an adjusting resistor One end of R7, the common end of the second capacitor C2 and the third capacitor C3 is connected to the other end of the adjusting resistor R7 and the anode of the diode D4, and the cathode of the diode D4 is connected to the transfer switch K2. The live voltage of the ground line is extracted by the coupling rectification of C6 and D4, the signal is sent to the 2 pin of IC2 through the switch K2, and one signal is extracted by C4 and sent to the 1 pin of IC2, the resistance R7 is used to adjust the detection sensitivity of IC2, C5, ...
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