| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a switching power supply circuit capable of achieving the same effect as before with a DC power source of a low voltage. <P>SOLUTION: Switching elements Q1-Q4 are connected so as to form a full bridge as shown in the figure. A voltage +1/2 HV from a DC power supply device is supplied to the connection point of the switching element Q1 and the switching element Q3, while a voltage -1/2 HV from the DC power supply device is supplied to the connection point of the switching element Q2 and the switching element Q4. An output terminal A is provided at the connection point of the switching element Q1 and the switching element Q2, while an output terminal B is provided at the connection point of the switching element Q3 and the switching element Q4. A wiring from the output terminal A is connected to one end of a load L of a motor or the like through a low-pass filter comprising a coil L1 and a capacitor C1, while a wiring from the output terminal B is connected to the other end of the load L of the motor or the like through another low-pass filter comprising a coil L2 and a capacitor C2. <P>COPYRIGHT: (C)2007,JPO&INPIT |
