DC-DC CONVERTER, I/O MODULE INCLUDING THE SAME, AND METHOD FOR CONTROLLING DC-DC CONVERTER

• US 20150270783A1
• Filed: 11/08/2012
• Published: 09/24/2015
• Est. Priority Date: 11/08/2012
• Status: Abandoned Application

• Current Assignee: ABB Schweiz AG (ABB Limited)
• Original Assignee: ABB Technology Limited (ABB Ltd.)
• Inventors: Li, Haoran, Shi, Huan, Lohbeck, Axel
• Application Number:
  US14/440,965
• Publication Number:
  US 20150270783A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02M 3/33546 with automatic control of the output voltage or current H02M3/33561 takes precedence
• CPC Class Codes: H02M 3/3372 of the parallel type

Abstract

Embodiments of the present invention provide a DC-DC converter, an input/output (I/O) module including the DC-DC converter, and a method for controlling DC-DC converter. The converter can comprise a planar transformer (2); a first switch element (3) connected between one end of primary winding of the planar transformer and a ground potential, and a second switch element (4) connected between the other end of the primary winding of the planar transformer and a ground potential. The first and second switch elements (3; 4) are respectively controlled to be closed alternately.

Claims

1. A DC-DC converter, comprising:

a planar transformer;

a first switch element connected between one end of primary winding of the planar transformer and a ground potential, and

a second switch element connected between the other end of the primary winding of the planar transformer and a ground potential;

wherein the first and second switch elements are respectively controlled to be closed alternately.

2. The converter according to claim 1, wherein the planar transformer has a first tap provided at a primary winding thereof, which is connected to a DC power supply.

3. The converter according to claim 1, further comprising:

a switch driving circuit for generating signals for controlling closing and opening of the first and second switch elements.

4. The converter according to claim 3, wherein the switch driving circuit comprises:

a first logic circuit having a first input for receiving a reference frequency signal (OSCout), a second input for receiving a first divided frequency signal (Q), and an output for outputting a signal (U1) controlling closing and opening of the first switch element, and

a second logic circuit having a first input for receiving the reference frequency signal (OSCout), a second input for receiving a second divided frequency signal ( Q), and an output for outputting a signal (U2) controlling closing and opening of the second switch element,

wherein the first divided frequency signal (Q) and the second divided frequency signal ( Q) have opposite phases, and have a fractional frequency of the reference frequency signal.

5. The converter according to claim 4, wherein the first divided frequency signal (Q) and the second divided frequency signal ( Q) have a half frequency of the reference frequency signal.

6. The converter according to claim 4, further comprising:

an oscillator for generating the reference frequency signal (OSCout), and the first divided frequency signal (Q) and the second divided frequency signal ( Q).

7. The converter according to claim 4, wherein the first and second logical circuits are AND logic circuits,

the signal (U1) controlling the first switch element is generated by an AND operation between the reference frequency signal (OSCout) and the first divided frequency signal (Q), and

the signal (U2) controlling the second switch element is generated by an AND operation between the reference frequency signal (OSCout) and the second divided frequency signal ( Q).

8. The converter according to claim 4, wherein the first and second logical circuits are NOR logical circuits,

the signal (U1) controlling the first switch element generated by a NOR operation between the reference frequency signal (OSCout) and the first divided frequency signal (Q), and

the signal (U2) controlling the second switch element is generated by a NOR operation between the reference frequency signal (OSCout) and the second divided frequency signal ( Q).

9. The converter according to claim 1, wherein the first and second switch elements are selected from MOSFETs, IGBTs or thyristors.

10. The converter according to claim 1, wherein a second tap is provided at a secondary winding of the planar transformer such that an output voltage of the planar transformer is adjustable by moving the second tap.

11. The converter according to claim 1, further comprising:

a rectifying circuit at a secondary winding side of the planar transformer.

12. The converter according to claim 1, wherein the converter is integrated in a PCB board.

13. A device comprising a DC-DC converter according to claim 1.

14. The device according to claim 13, wherein the device is an I/O module.

15. A method for controlling a DC-DC converter, wherein the DC-DC converter comprises a planar transformer having a first tap provided at a primary winding thereof and connected to a DC power supply, a first switch element between one end of the primary winding of the planar transformer and a ground potential, and a second switch element between the other end of the primary winding of the planar transformer and a ground potential, the method comprising:

respectively controlling the first and second switch elements to be closed alternately.

16. The method according to claim 15, further comprising:

generating a signal (U1) controlling closing and opening of the first switch element by performing a first logic operation between a reference frequency signal (OSCout) and a first divided frequency signal (Q), and

generating a signal (U1) controlling closing and opening of the second switch element by performing a second logic operation between the reference frequency signal (OSCout) and a second divided frequency signal ( Q),

wherein the first divided frequency signal (Q) and the second divided frequency signal ( Q) have opposite phases, and have a fractional frequency of the reference frequency signal.

17. The method according to claim 16, wherein the first divided frequency signal (Q) and the second divided frequency signal ( Q) have a half frequency of the reference frequency signal.

18. The method according to claim 16, wherein both the first and second logical operations are AND logic operations or NOR logical operations.

19. The method according to claim 15, wherein the DC-DC converter further comprises a second tap provided at a secondary winding of the planar transformer, wherein the method further comprises:

adjusting an output voltage of the planar transformer by moving the second tap.

20. The method according to claim 15, wherein the first and second switch elements are selected from MOSFETs, IGBTs or thyristors.