Switching power supply device
First Claim
1. A switching power supply comprising:
- a first series circuit, connected to both terminals of a direct current power supply, in which a primary winding of a transformer, a reactor, and a first switch are connected in series;
a second series circuit, connected to one of both terminals of the first switch and both terminals of the primary winding and the reactor, in which a second switch and a capacitor are connected in series;
a smoothing circuit smoothing a voltage developed across a secondary winding of the transformer; and
a control circuit alternately turning on and turning off the first and second switches, wherein the transformer includes a main core, formed with a magnetic circuit, on which the primary and secondary windings are wound with a given gap, and a plurality of auxiliary cores disposed in the given gap with a given distance in a circumferential direction of the primary winding, and wherein the reactor is formed of a leakage inductance of the transformer.
1 Assignment
0 Petitions
Accused Products
Abstract
A switching power supply includes: a first series circuit, connected to both terminals of a direct current power supply Vdc1, in which a primary winding 5a of a transformer T, a reactor L3 and a first switch Q1 are connected in series; a second series circuit, connected to both terminals of the primary winding 5a and the reactor L3, which includes a switch Q2 and a capacitor C3; a smoothing circuit D1, D2, L1, C4; and a control circuit 10 alternately turning on and turning off the switches Q1, Q2. The transformer T includes: a main core 21, formed with a magnetic circuit, on which the primary and secondary windings 5a, 5b are wound with a given gap 23; and a plurality of auxiliary cores 24a, 24b disposed in the given gap 23 with a given distance in a circumferential direction of the primary winding 5a. Further, the reactor L3 is formed of a leakage inductance of the transformer T.
-
Citations
12 Claims
-
1. A switching power supply comprising:
-
a first series circuit, connected to both terminals of a direct current power supply, in which a primary winding of a transformer, a reactor, and a first switch are connected in series;
a second series circuit, connected to one of both terminals of the first switch and both terminals of the primary winding and the reactor, in which a second switch and a capacitor are connected in series;
a smoothing circuit smoothing a voltage developed across a secondary winding of the transformer; and
a control circuit alternately turning on and turning off the first and second switches, wherein the transformer includes a main core, formed with a magnetic circuit, on which the primary and secondary windings are wound with a given gap, and a plurality of auxiliary cores disposed in the given gap with a given distance in a circumferential direction of the primary winding, and wherein the reactor is formed of a leakage inductance of the transformer. - View Dependent Claims (2, 3, 7, 8, 9)
-
-
4. A switching power supply comprising:
-
a first series circuit, connected to both terminals of a direct current power supply, in which a primary winding of a transformer, a reactor, and a first switch are connected in series;
a second series circuit, connected to one of both terminals of the first switch and both terminals of the primary winding and the reactor, in which a second switch and a capacitor are connected in series;
a smoothing circuit smoothing a voltage developed across a secondary winding of the transformer;
a control circuit alternately turning on and turning off the first and second switches; and
a feedback winding, located on a secondary side of the transformer, which allows energy stored in the reactor when the first switch is turned on to be circulated to the secondary side when the first switch is turned off, wherein the transformer, formed with a magnetic circuit, including;
a main core that has a central leg on which the primary winding of the transformer and the feedback winding are wound with a given gap and a side core on which the secondary winding of the transformer is wound; and
a plurality of auxiliary cores disposed in the given gap with a given distance in a circumferential direction of the primary winding, andwherein the reactor is formed of a leakage inductance of the transformer. - View Dependent Claims (5, 6, 10, 11, 12)
-
Specification