Switching power supply apparatus
First Claim
1. A switching power supply apparatus comprising:
- a first switching circuit for supplying and interrupting power from a power supply input unit;
an inductor for accumulating the power input through the first switching circuit and discharging the power to a power supply output unit;
a rectifier diode for rectifying a current flowing to the output unit; and
a smoothing capacitor for smoothing a voltage of the output unit;
wherein a first commutation inductor is provided in a path of current flowing from the power supply input unit through the first switching circuit and the inductor during an ON period of the first switching circuit;
a second commutation inductor is provided in a path of current flowing through the inductor during an OFF period of the first switching circuit;
the inductor and the first and second commutation inductors are connected to a first junction point;
a clamping series circuit including a second switching circuit and a series capacitor connected in series is provided, and one end of the clamping series circuit is connected to a second junction point, which connects the first commutation inductor and the first switching circuit, so that the first and second commutation inductors and the series capacitor constitute a resonance circuit;
the first switching circuit includes a parallel circuit of a first switching element, a first diode, and a first capacitor;
the second switching circuit includes a parallel circuit of a second switching element, a second diode, and a second capacitor; and
a switching control circuit for alternately turning on/off the first and second switching elements in a period when both switching elements are off therebetween is provided.
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Accused Products
Abstract
A switching power supply apparatus includes a first commutation inductor which is provided in a path of current flowing from a power supply input unit through a first switching circuit and an inductor during an ON period of a first switching circuit, and a second commutation inductor provided in a path of current flowing through the inductor during an OFF period of the first switching circuit. The first and second commutation inductors and the inductor are connected to a first junction point. One end of a clamping series circuit, which includes a second switching circuit and a series capacitor connected in series, is connected to a second junction point, which connects the first commutation inductor and the first switching circuit, and the other end thereof is connected so that the first and second commutation inductors and the series capacitor constitute a resonance circuit. Accordingly, first and second switching elements can be turned on at a zero voltage.
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Citations
11 Claims
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1. A switching power supply apparatus comprising:
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a first switching circuit for supplying and interrupting power from a power supply input unit;
an inductor for accumulating the power input through the first switching circuit and discharging the power to a power supply output unit;
a rectifier diode for rectifying a current flowing to the output unit; and
a smoothing capacitor for smoothing a voltage of the output unit;
wherein a first commutation inductor is provided in a path of current flowing from the power supply input unit through the first switching circuit and the inductor during an ON period of the first switching circuit;
a second commutation inductor is provided in a path of current flowing through the inductor during an OFF period of the first switching circuit;
the inductor and the first and second commutation inductors are connected to a first junction point;
a clamping series circuit including a second switching circuit and a series capacitor connected in series is provided, and one end of the clamping series circuit is connected to a second junction point, which connects the first commutation inductor and the first switching circuit, so that the first and second commutation inductors and the series capacitor constitute a resonance circuit;
the first switching circuit includes a parallel circuit of a first switching element, a first diode, and a first capacitor;
the second switching circuit includes a parallel circuit of a second switching element, a second diode, and a second capacitor; and
a switching control circuit for alternately turning on/off the first and second switching elements in a period when both switching elements are off therebetween is provided. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification