Start-up circuit with high-tension power supply
A technology of starting circuit and high-voltage power supply, applied in the direction of electrical components, output power conversion devices, etc., can solve the problems of large space occupation, high cost, high input voltage, etc., achieve low raw material cost, reduce voltage stress, and improve reliability Effect
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[0021] Such as image 3 As shown, the high-voltage power supply startup circuit described in Embodiment 1 of the present invention includes:
[0022] A capacitive voltage dividing circuit composed of the first voltage dividing capacitor C2 and the second voltage dividing capacitor C3 connected in series; the positive pole of the input voltage Vin is connected to one end of the first voltage dividing capacitor C2, and the other end of the first voltage dividing capacitor C2 is connected to the second voltage dividing capacitor C2. One end of the second voltage dividing capacitor C3 is connected to each other, and the other end of the second voltage dividing capacitor C3 is connected to the negative pole of the input voltage Vin.
[0023] The power resistor R3, capacitor C4 and Zener diode Z2 are connected to form a delay control loop; the cathode of the Zener diode Z2 is connected to the second voltage-dividing capacitor C3 and the upper-stage voltage-dividing capacitor (ie, th...
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