High and low voltage changeover circuit
A high and low voltage conversion and circuit technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc.
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[0017] Such as figure 2 A high-voltage and low-voltage conversion circuit shown includes a reference current generation circuit 21 , a low-voltage generation circuit 22 and an output voltage stabilization circuit 23 . Wherein, the reference current generation circuit 21 provides a reference current for the low voltage generation circuit 22; the low voltage generation circuit includes a parasitic PNP, a compensation resistor and a low voltage MOS transistor, and the parasitic PNP, compensation resistor and a low voltage MOS transistor provide a stable drive for the output voltage stabilizing circuit Voltage; the driving voltage is output by the first current mirror and the stable low-voltage VCC through the voltage stabilizing capacitor in the output voltage stabilizing circuit.
[0018] The first current mirror includes a tenth NMOS transistor M210 on the low voltage generating circuit 22 and an eleventh NMOS transistor M211 on the output voltage stabilizing circuit 23 . Whe...
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