Switching power circuit, and lighting device for semiconductor light-emitting element and illumination apparatus using same
First Claim
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1. A switching power circuit comprising:
- a rectifying circuit for rectifying AC power;
a first capacitor connected to an output terminal of the rectifying circuit through a current limiting resistor for restraining an inrush current, the first capacitor being a smoothing capacitor;
a first switching element having one end connected to a positive electrode of the first capacitor;
a second switching element having one end connected to a negative electrode of the first capacitor;
an inductive element having one end connected to the other ends of the first and the second switching element;
a semiconductor switching element connected in parallel to the current limiting resistor; and
a second capacitor connected to a control electrode of the semiconductor switching element,wherein the second capacitor is charged by using a voltage induced to the inductive element when the first or the second switching element is off.
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Abstract
A switching power circuit includes a first switching element having one end connected to a positive electrode of a first capacitor, a second switching element having one end connected to a negative electrode of the first capacitor, an inductive element having one end connected to the other ends of the first and the second switching element, a semiconductor switching element connected in parallel to the current limiting resistor, and a second capacitor connected to a control electrode of the semiconductor switching element. The second capacitor is charged by using a voltage induced to the inductive element when the first or the second switching element is off.
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Citations
8 Claims
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1. A switching power circuit comprising:
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a rectifying circuit for rectifying AC power; a first capacitor connected to an output terminal of the rectifying circuit through a current limiting resistor for restraining an inrush current, the first capacitor being a smoothing capacitor; a first switching element having one end connected to a positive electrode of the first capacitor; a second switching element having one end connected to a negative electrode of the first capacitor; an inductive element having one end connected to the other ends of the first and the second switching element; a semiconductor switching element connected in parallel to the current limiting resistor; and a second capacitor connected to a control electrode of the semiconductor switching element, wherein the second capacitor is charged by using a voltage induced to the inductive element when the first or the second switching element is off. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification