Switching power supply
First Claim
1. A switching power supply device comprising:
- a switching circuit for interrupting direct current to generate a pulse voltage;
a transformer including a primary winding, a secondary winding, and a core for magnetically coupling the primary winding and the secondary winding;
a multi-layer wiring board having wiring constituting the primary winding and the secondary winding;
a rectifier circuit for rectifying an alternating current;
a smoothing circuit for suppressing ripple; and
a control circuit for controlling an output voltage from the smoothing circuit, the switching power supply device being for outputting a direct current obtained by applying the pulse voltage to a first connecting portion of the primary winding to induce an alternating current in a second connecting portion of the secondary winding, rectifying the alternating current by the rectifier circuit, and smoothing the alternating current by the smoothing circuit, wherein the multi-layer wiring board is provided with at least the switching circuit and the rectifier circuit and is arranged on a main wiring board, and the control circuit is arranged on the main wiring board.
1 Assignment
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Accused Products
Abstract
A switching power supply device of the invention includes: a switching circuit for interrupting direct current to generate a pulse voltage; a transformer including a primary winding, a secondary winding, and a core for magnetically coupling the primary winding and the secondary winding; a multi-layer wiring board having wiring lines constituting the primary winding and the secondary winding; a rectifier circuit for rectifying an alternating current; a smoothing circuit for suppressing ripple; and a control circuit for controlling an output voltage from the smoothing circuit. The multi-layer wiring board is provided with at least the switching circuit and the rectifier circuit and is arranged on a main wiring board, and the control circuit is arranged on the main wiring board.
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Citations
13 Claims
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1. A switching power supply device comprising:
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a switching circuit for interrupting direct current to generate a pulse voltage;
a transformer including a primary winding, a secondary winding, and a core for magnetically coupling the primary winding and the secondary winding;
a multi-layer wiring board having wiring constituting the primary winding and the secondary winding;
a rectifier circuit for rectifying an alternating current;
a smoothing circuit for suppressing ripple; and
a control circuit for controlling an output voltage from the smoothing circuit, the switching power supply device being for outputting a direct current obtained by applying the pulse voltage to a first connecting portion of the primary winding to induce an alternating current in a second connecting portion of the secondary winding, rectifying the alternating current by the rectifier circuit, and smoothing the alternating current by the smoothing circuit, wherein the multi-layer wiring board is provided with at least the switching circuit and the rectifier circuit and is arranged on a main wiring board, and the control circuit is arranged on the main wiring board. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A switching power supply device comprising:
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a switching circuit for interrupting direct current to generate a pulse voltage;
a transformer including a primary winding, a secondary winding, and a core for magnetically coupling the primary winding and the secondary winding;
a multi-layer wiring board having wiring constituting the primary winding and the secondary winding;
a rectifier circuit for rectifying an alternating current;
a smoothing circuit for suppressing ripple; and
a control circuit for controlling an output voltage from the smoothing circuit, the switching power supply device being for outputting a direct current obtained by applying the pulse voltage to a first connecting portion of the primary winding to induce an alternating current in a second connecting portion of the secondary winding, rectifying the alternating current by the rectifier circuit, and smoothing the alternating current by the smoothing circuit, wherein the switching power supply device has a lead frame board in which a heat sink and a wiring layer formed substantially two-dimensionally are stacked with an electrically insulative member interposed therebetween, the electrically insulative member composed of a mixture containing at least an electrically insulative resin and a filler; and
the multi-layer wiring board having at least the switching circuit and the rectifier circuit is arranged on the wiring layer of the lead frame board. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification