Constant current symmetrical trigger-type driving power supply for power system fault detecting device
A fault detection and power system technology, which is applied in the direction of output power conversion device, electrical components, AC power input conversion to DC power output, etc., can solve the problems that the working current cannot maintain a constant value, power supply electromagnetic interference, etc., and achieve production costs and maintenance cost reduction, avoid current fluctuations, wide range of use
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[0019] Such as figure 1 As shown, the present invention consists of a diode rectifier U, a nonlinear trigger circuit connected with the diode rectifier U, a main quartz crystal oscillator circuit and a secondary quartz crystal oscillator circuit connected with the nonlinear trigger circuit, and a diode rectifier connected in series It is composed of a power logic voltage regulator circuit between U and the non-linear trigger circuit. In order to achieve the purpose of the present invention, a constant current circuit is connected in series between the power logic voltage stabilizing circuit and the nonlinear trigger circuit.
[0020] Wherein, the constant current circuit is the key point of the present invention, as figure 2 As shown, it includes operational amplifier P2, operational amplifier P3, field effect transistor MOS1, field effect transistor MOS2, field effect transistor MOS3, triode Q3, and triode Q4.
[0021] In order to achieve the desired effect, the constant c...
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