Inverter bridge switching power source utlizing a capacitor with transformer for multiple outputs

• US 8,680,711 B2
• Filed: 05/17/2012
• Issued: 03/25/2014
• Est. Priority Date: 05/30/2011
• Status: Active Grant

• Current Assignee: Sanken Electric Company Limited
• Original Assignee: Sanken Electric Company Limited
• Inventors: Chiba, Akiteru
• Primary Examiner(s): Vu, Bao Q
• Application Number:
  US13/473,932
• Publication Number:
  US 20120307529A1
• Time in Patent Office: 677 Days
• Field of Search: 307/43, 307/44, 307/46
• US Class Current: 307/44
• CPC Class Codes: H02M 1/08 Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
• CPC Class Codes: H02M 3/3376 with automatic control of output voltage or current

Abstract

A switching power source apparatus includes a first arm including first and second switching elements, a second arm including third and fourth switching elements, a series circuit connected between a connection point of the first and second switching elements and a connection point of the third and fourth switching elements and including a capacitor and a primary winding, a rectifying-smoothing circuit that rectifies and smoothes a voltage of a secondary winding and provides an output voltage, a reactor connected to a connection point of the first and second switching elements and a DC input end, and a controller that turns on/off the first and second switching elements alternately and the third and fourth switching elements alternately and synchronizes the first and third switching elements with each other and the second and fourth switching elements with each other.

Claims

1. A switching power source apparatus comprising:

a first arm including a first switching element and a second switching element connected in series with the first switching element;

a second arm connected in parallel with the first arm and including a third switching element and a fourth switching element connected in series with the third switching element, the first and third switching elements being diagonal to each other, and the second and fourth switching elements being diagonal to each other;

a first series circuit connected between a connection point of the first and second switching elements and a connection point of the third and fourth switching elements and including a first capacitor and a primary winding of a transformer connected in series with the first capacitor;

a first rectifying-smoothing circuit configured to rectify and smooth a voltage of a secondary winding of the transformer and provide a first output voltage;

a first reactor connected to a connection point of the first and second switching elements and one of DC input and output ends; and

a controller that turns on/off the first and second switching elements alternately, turns on/off the third and fourth switching elements alternately, synchronizes the first and third switching elements with each other, and synchronizes the second and fourth switching elements with each other.

2. The switching power source apparatus of claim 1, wherein the primary winding of the transformer is connected to a second reactor that is a leakage inductance between the primary and secondary windings of the transformer.

3. The switching power source apparatus of claim 1, wherein the controller synchronizes a signal for turning on the first switching element with a signal for turning on the third switching element and synchronizes a signal for turning off the second switching element with a signal for turning off the fourth switching element.

4. The switching power source apparatus of claim 1, wherein the controller synchronizes a signal for turning off the first switching element with a signal for turning off the third switching element and synchronizes a signal for turning on the second switching element with a signal for turning on the fourth switching element.

5. The switching power source apparatus of claim 1, wherein:

the DC input end of the first reactor is connected to a DC power source;

the DC power source includes an AC power source and a rectifying circuit; and

the controller carries out power factor correcting control.

6. The switching power source apparatus of claim 1, further comprising a second capacitor that is connected to both ends of the series circuit of the third and fourth switching elements and provides a second output voltage.