POWER SUPPLY CIRCUIT DEVICE USING NEGATIVE THRESHOLD FIVE-TERMINAL NMOS TRANSISTOR ELEMENT HAVING POWER AMPLIFICATION MULTI-STEP CONNECTIONS FOR NEGATIVE VOLTAGE CONVERSION AND APPLICATION

摘要

The present invention relates to a power supply device which converts high-voltage AC or DC power into low-voltage DC power. The power supply device comprises a configuration of a depletion N-type Metal Oxide Semiconductor (NMOS) Field Effect Transistor (FET) having a characteristic of a negative voltage between a gate and a source without a configuration of a separated typical transformer circuit and a configuration of a Zener diode element. That is, the power supply device comprises a negative threshold five-terminal NMOS FET element. Accordingly, a configuration of a typical transformer circuit (101) and a configuration of a Zener diode (104) circuit can be removed, and thus areas occupied by the typical transformer circuit (101) and the Zener diode (104) circuit are not required, thereby implementing a low-cost circuit. Loss of standby or operating power can be prevented, thereby implementing a circuit consuming no power in a state in which standby or operating power is supplied to the circuit. The power supply device implements free-voltage operation even in a region of high-voltage supplied power. Furthermore, the power supply device implements negative power amplification, enabling a negative voltage to be generated and supplied, by using a negative DC/DC Converter circuit.