| 摘要 |
PURPOSE: An inverter driving circuit is provided to obtain stable DC power in a power output terminal by monitoring the usage of the load of a trans power input method and a connection polarity state of the load. CONSTITUTION: An inverter driving circuit is a full bridge circuit using four MOSFETs receiving the DC voltage from a power supply unit(10). The voltage is outputted to a power output terminal(50). One of power output terminals is positioned in the central position in which a first MOSFET(Q1) and a third MOSFET(Q3). The other of power output terminals is positioned in the central position in which a second MOSFET(Q2) and a fourth MOSFET(Q3). A positive voltage is applied by connecting the drains of the first MOSFET and the second MOSFET. A resistor and a PTC element are connected between the drain and the source of a fifth MOSFET(Q5). An output signal of a comparator is inputted to a microcomputer(40). A control output signal of the microcomputer is applied to the gate of the first to fourth MOSFETs.
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