POWER CONVERSION APPARATUS

• US 20130039097A1
• Filed: 08/07/2012
• Published: 02/14/2013
• Est. Priority Date: 08/09/2011
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Maebara, Tsuneo, Watanabe, Kazunori
• Granted Patent: US 8,823,207 B2
• Time in Patent Office: Days
• US Class Current: 363/21.01
• CPC Class Codes: B60L 15/007 Physical arrangements or structures of drive train converters specially adapted for the propulsion motors of electric vehicles
• CPC Class Codes: H02M 1/44 Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
• CPC Class Codes: H02M 3/33561 having more than one ouput with independent control
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility

Abstract

A power conversion apparatus capable of suppressing adverse effects of noise caused by crossing of wiring patterns on a wiring board mounting the apparatus thereon. The apparatus includes a transformer, a switching element connected to the transformer, a feedback rectification circuit, and a control circuit operable to control the switching element in response to a DC voltage from the feedback rectification circuit. A first wiring pattern electrically connecting the feedback rectification circuit and the control circuit is formed in one of two surface regions of the wiring board separated by an imaginary line running through a junction of the first wiring pattern and the feedback rectification circuit and a junction of the first wiring pattern and the control circuit, and a second wiring pattern electrically connecting the control circuit and the switching element is formed outside an area enclosed by the imaginary line and the first wiring pattern.

Claims

1. A power conversion apparatus comprising:

a transformer mounted on a wiring board and including a primary coil, a secondary coil, and a feedback secondary coil;

a switching element mounted on the wiring board and electrically connected to one of a pair of connection terminals of the primary coil, the switching element being operable to convert a DC voltage supplied from a voltage source electrically connected to the other of the pair of connection terminals of the primary coil into an AC voltage to supply the AC voltage to the primary coil by being turned on and off;

a feedback rectification circuit mounted on the wiring board and electrically connected to the feedback secondary coil, the rectification circuit being operable to rectify an AC voltage outputted from the feedback secondary coil into a DC voltage;

a control circuit mounted on the wiring board and electrically connected to the switching element and to the feedback rectification circuit, the control circuit being operable to control the switching element in response to the DC voltage outputted from the feedback rectification circuit;

a first wiring pattern that electrically connects the feedback rectification circuit and the control circuit, the first wiring pattern being formed in one of two surface regions of the wiring board separated from each other by an imaginary line running through a first junction of the first wiring pattern and the feedback rectification circuit and a second junction of the first wiring pattern and the control circuit; and

a second wiring pattern that electrically connects the control circuit and the switching element, the second wiring pattern being formed outside an area enclosed by the imaginary line and the first wiring pattern.

2. The apparatus of claim 1, further comprising a smoothing capacitor mounted on the wiring board and electrically connected to the feedback rectification circuit, the smoothing capacitor being operable to smooth the DC voltage rectified by the feedback rectification circuit,

wherein the smoothing capacitor is electrically connected to the feedback rectification circuit via the first wiring pattern.

3. The apparatus of claim 1, further comprising a current detection circuit mounted on the wiring board and electrically connected to the switching element, the current detection circuit being operable to detect a current flowing through the switching element,

wherein the control circuit is electrically connected to the current detection circuit and determines whether or not there exists an abnormality on the basis of the current detected by the current detection circuit.

4. The apparatus of claim 3, further comprising:

a third wiring pattern that electrically connects the switching element and the current detection circuit; and

a fourth wiring pattern that electrically connects the current detection circuit and the control circuit,

wherein at least one of the third and fourth wiring patterns is formed outside the area enclosed by the imaginary line and the first wiring pattern.

5. The apparatus of claim 4, wherein at least one of the third and the fourth wiring patterns is parallel with the second wiring pattern.

6. The apparatus of claim 1, further comprising:

a fifth wiring pattern that electrically connects the voltage source and the primary coil, the fifth wiring pattern being formed outside the area enclosed by the imaginary line and the first wiring pattern.

7. The apparatus of claim 1, further comprising:

a sixth wiring pattern that electrically connects the primary coil and the switching element, the sixth wiring pattern being formed outside the area enclosed by the imaginary line and the first wiring pattern.

8. The apparatus of claim 1, wherein a pair of connection terminals of the feedback secondary coil, the pair of connection terminals of the primary coil, and a pair of connection terminals of the secondary coil are arranged in a row in this order.

9. The apparatus of claim 8, further comprising:

a seventh wiring pattern electrically connected to the pair of connection terminals of the secondary coil, at least a portion of the seventh wiring pattern being formed under the transformer.

10. The apparatus of claim 9, wherein the portion of the seventh wiring pattern is formed on a transformer mounting surface of the wiring board and under the transformer.

11. The apparatus of claim 4, comprising two distinct sets of circuits each including the transformer, the switching element, the feedback rectification circuit, the current detection circuit, and the control circuit,

wherein a first set of the first to fourth wiring patterns for one of the two sets of circuits and a second set of the first to fourth wiring patterns for the other of the two sets of circuits are symmetric to each other with respect to an imaginary line on the wiring board.

12. The apparatus of claim 1, wherein the apparatus is mounted in a vehicle.

13. The apparatus of claim 1, wherein the switching element is a metal-oxide-semiconductor field-effect transistor (MOSFET) and the gate of the MOSFET is electrically connected to the control circuit.

14. The apparatus of claim 3, wherein the abnormality includes an overcurrent fault, and the control circuit stops a switching operation of the switching element when it is determined that there exists an overcurrent fault.