Constant current circuit-based power supply for power system fault detection device
A fault detection and power system technology, applied in the direction of output power conversion devices, electrical components, etc., can solve the problems of electromagnetic interference of the power supply, the working current cannot be maintained at a constant value, etc., to avoid current fluctuations, reduce production costs and maintenance costs, The effect of simplifying the circuit structure
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[0019] Such as figure 1 As shown, the present invention consists of a transformer diode trigger circuit, a primary crystal oscillator circuit and a secondary crystal oscillator circuit connected to the transformer diode trigger circuit, and a power logic control circuit connected to the transformer diode trigger circuit. The transformer diode triggers The circuit is composed of a diode rectifier U, a transformer T and a trigger circuit. The primary crystal oscillator circuit and the secondary crystal oscillator circuit are both connected with the trigger circuit. In order to achieve the purpose of the present invention, a constant current circuit is also connected in series between the power logic control circuit and the trigger circuit.
[0020] Among them, the constant current circuit is the focus of the present invention, such as figure 2 As shown, it includes an operational amplifier P2, an operational amplifier P3, a field effect tube MOS1, a field effect tube MOS2, a field...
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