DC POWER SUPPLY CIRCUIT

摘要

In a DC power supply circuit, upon a switching element switching to a turned-on state, a first current path is formed from an output terminal at a high-potential side of a rectifier circuit to an output terminal at a low-potential side of a rectifier circuit, via an inductor and the switching element in respective order, and a second current path is formed between terminals of a capacitor, via a load, another inductor, and the switching element. Upon the switching element switching to a turned-off state, a third current path is formed from the output terminal at the high-potential side of a rectifier circuit to the output terminal at the low-potential side of a rectifier circuit, via the inductor, a diode, and the capacitor in respective order, and a fourth current path is formed between the inductors, via the diode and the load in respective order.

主权项

1. A DC power supply circuit comprising:
a rectifier circuit rectifying AC supplied from an AC power source; a capacitor having a first terminal that is connected to an output terminal at a low-potential side of the rectifier circuit; a first inductor having a first terminal that is connected to a second terminal of the capacitor via a load; a switching element connected between a second terminal of the first inductor and the output terminal at the low-potential side of the rectifier circuit, and repeatedly switching between a turned-on state and a turned-off state during each half cycle of the AC power source; a unidirectional element connected between the second terminal of the first inductor and the second terminal of the capacitor; and a second inductor having a first terminal that is connected to the second terminal of the first inductor and a second terminal that is connected to an output terminal at a high-potential side of the rectifier circuit, wherein upon the switching element switching to the turned-on state:
a first current path is formed that extends from the output terminal at the high-potential side of the rectifier circuit to the output terminal at the low-potential side of the rectifier circuit, via the second inductor and the switching element in respective order; anda second current path is formed that extends from the second terminal of the capacitor to the first terminal of the capacitor, via the load, the first inductor, and the switching element in respective order, and upon the switching element switching to the turned-off state:
a third current path is formed that extends from the output terminal at the high-potential side of the rectifier circuit to the output terminal at the low-potential side of the rectifier circuit, via the second inductor, the unidirectional element, and the capacitor in respective order; anda fourth current path is formed that extends from the second terminal of the first inductor to the first terminal of the first inductor, via the first unidirectional element and the load in respective order.