POWER CONVERSION SYSTEM AND METHOD OF CONTROLLING POWER CONVERSION SYSTEM

• US 20150043251A1
• Filed: 08/05/2014
• Published: 02/12/2015
• Est. Priority Date: 08/07/2013
• Status: Abandoned Application

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: HASEGAWA, Takahiko
• Application Number:
  US14/451,792
• Publication Number:
  US 20150043251A1
• Time in Patent Office: Days
• US Class Current: 363/21.12
• CPC Class Codes: H02M 1/34 Snubber circuits
• CPC Class Codes: H02M 1/346 Passive non-dissipative snubbers
• CPC Class Codes: H02M 3/1584 with a plurality of power processing stages connected in parallel
• CPC Class Codes: H02M 3/285 Single converters with a plurality of output stages connected in parallel parallel operation of a plurality of converters in dc distribution networks H02J1/10
• CPC Class Codes: H02M 3/33507 with automatic control of the output voltage or current, e.g. flyback converters H02M3/33561, H02M3/33569 take precedence
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

A power conversion system includes a first switching DC-DC converter circuit including a first switching device, a second switching DC-DC converter circuit connected in parallel with the first switching DC-DC converter circuit and including a second switching device, and a snubber capacitor connected in parallel with each of the first switching device and the second switching device. The power conversion system is configured such that a frequency of driving the first switching DC-DC converter circuit is higher than a frequency of driving the second switching DC-DC converter circuit, and an equivalent series inductance of a closed circuit including the first switching device and the snubber capacitor is smaller than that of a closed circuit including the second switching device and the snubber capacitor.

Claims

1. A power conversion system, comprising:

a first switching DC-DC converter circuit including a first switching device;

a second switching DC-DC converter circuit connected in parallel with the first switching DC-DC converter circuit, the second switching DC-DC converter circuit including a second switching device; and

a snubber capacitor connected in parallel with each of the first switching device and the second switching device,

wherein the first switching DC-DC converter circuit, the second switching DC-DC converter circuit, and the snubber capacitor are configured such that a frequency of driving the first switching DC-DC converter circuit is higher than a frequency of driving the second switching DC-DC converter circuit, and an equivalent series inductance of a closed circuit including the first switching device and the snubber capacitor is smaller than an equivalent series inductance of a closed circuit including the second switching device and the snubber capacitor.

2. The power conversion system according to claim 1, further comprising a controller that performs drive control of the first switching DC-DC converter circuit and the second switching DC-DC converter circuit,

wherein the controller is configured to preferentially drive the first switching DC-DC converter circuit when driving at least one of the first switching DC-DC converter circuit and the second switching DC-DC converter circuit.

3. The power conversion system according to claim 1, wherein the power conversion system is installed on a mobile body, and supplies electric power to a device that drives the mobile body.

4. The power conversion system according to claim 1, wherein the first switching DC-DC converter circuit and the second switching DC-DC converter circuit are positioned so that the first switching DC-DC converter circuit has a higher cooling efficiency than the second switching DC-DC converter circuit.

5. The power conversion system according to claim 4, wherein the first switching DC-DC converter circuit is located in an end portion of the power conversion system.

6. A method of controlling a power conversion system including a first switching DC-DC converter circuit including a first switching device, a second switching DC-DC converter circuit connected in parallel with the first switching DC-DC converter circuit and including a second switching device, and a snubber capacitor connected in parallel with each of the first switching device and the second switching device, comprising:

when driving at least one of the first switching DC-DC converter circuit and the second switching DC-DC converter circuit, preferentially driving one of the first switching DC-DC converter circuit and the second switching DC-DC converter circuit including, as a part thereof, a closed circuit having a smaller equivalent series inductance, which is selected from a closed circuit including the first switching device and the snubber capacitor, and a closed circuit including the second switching device and the snubber capacitor.

7. A power conversion system, comprising:

a first switching DC-DC converter circuit including a first switching device;

a second switching DC-DC converter circuit connected in parallel with the first switching DC-DC converter circuit, the second switching DC-DC converter circuit including a second switching device; and

a snubber capacitor connected in parallel with each of the first switching device and the second switching device,

wherein the first switching DC-DC converter circuit, the second switching DC-DC converter circuit, and the snubber capacitor are configured such that an equivalent series inductance of a closed circuit including the first switching device and the snubber capacitor is substantially equal to an equivalent series inductance of a closed circuit including the second switching device and the snubber capacitor.