Resonant power converter
First Claim
1. A resonant power converter comprising:
- a positive bus line (1A);
a negative bus line (1B);
a power converting portion (2) connected between a DC power source (1) and a load (5) for implementing power conversion, the power converting portion including a plurality of main switching devices (3a-3f) connected in series and provided between the positive bus line and the negative bus line, and a plurality of flywheel diodes (4a-4f) connected in antiparallel with the main switching devices respectively for each phase;
a resonant circuit (8) connected between the positive bus line and the negative bus line, and including a resonant capacitor (6) and a resonant reactor (7) connected in series with the resonant capacitor; and
control means (13) for switching the main switching devices in accordance with a predetermined pattern to enable the power converting portion to implement power conversion;
wherein the control means turns on a first switching device which should turn on based on the gate signal command, the output signal of the gate signal circuit, among the main switching devices to start resonance to be implemented by the resonant capacitor and the resonant reactor, and the control means turns off a second switching device which should turn off based on the gate signal command, the output signal of the gate signal circuit, among the main switching devices when a resonant current caused by the resonance is greater than a load current and hence a current flows through one of the flywheel diodes which is connected in antiparallel with the second switching device.
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Accused Products
Abstract
A resonant power converter includes a positive bus line (1A) and a negative bus line (1B). A power converting portion (2) connected between a DC power source (1) and a load (5) operates for implementing power conversion. The power converting portion includes a plurality of main switching devices (3a-3f) connected in series and provided between the positive bus line and the negative bus line, and a plurality of flywheel diodes (4a-4f) connected in antiparallel with the main switching devices respectively for each phase. A resonant circuit (8) connected between the positive bus line and the negative bus line includes a resonant capacitor (6) and a resonant reactor (7) connected in series with the resonant capacitor. A control device (13) operates for switching the main switching devices in accordance with a predetermined pattern to enable the power converting portion to implement power conversion. The control device turns on a first switching device among the main switching devices to start resonance to be implemented by the resonant capacitor and the resonant reactor. The control means turns off a second switching device among the main switching devices when a resonant current caused by the resonance is greater than a load current and hence a current flows through one of the flywheel diodes which is connected in antiparallel with the second switching device.
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Citations
28 Claims
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1. A resonant power converter comprising:
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a positive bus line (1A); a negative bus line (1B); a power converting portion (2) connected between a DC power source (1) and a load (5) for implementing power conversion, the power converting portion including a plurality of main switching devices (3a-3f) connected in series and provided between the positive bus line and the negative bus line, and a plurality of flywheel diodes (4a-4f) connected in antiparallel with the main switching devices respectively for each phase; a resonant circuit (8) connected between the positive bus line and the negative bus line, and including a resonant capacitor (6) and a resonant reactor (7) connected in series with the resonant capacitor; and control means (13) for switching the main switching devices in accordance with a predetermined pattern to enable the power converting portion to implement power conversion; wherein the control means turns on a first switching device which should turn on based on the gate signal command, the output signal of the gate signal circuit, among the main switching devices to start resonance to be implemented by the resonant capacitor and the resonant reactor, and the control means turns off a second switching device which should turn off based on the gate signal command, the output signal of the gate signal circuit, among the main switching devices when a resonant current caused by the resonance is greater than a load current and hence a current flows through one of the flywheel diodes which is connected in antiparallel with the second switching device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A resonant power converter comprising:
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a positive bus line (1A); a negative bus line (1B); a power converting portion (2) connected between a DC power source (1) and a load (5) for implementing power conversion, the power converting portion including a plurality of main switching devices (3a-3f) connected in series and provided between the positive bus line and the negative bus line, and a plurality of flywheel diodes (4a-4f) connected in antiparallel with the main switching devices respectively for each arm; a resonant circuit (8) connected between the positive bus line and the negative bus line, and including a resonant capacitor (6) and a resonant reactor (7) connected in series with the resonant capacitor; and control means (13) for turning on the main switching devices to start resonance to be implemented by the resonant capacitor and the resonant reactor, and for turning off a switching device among the main switching devices when the resonance causes a voltage between the positive bus line and the negative bus line to become substantially 0 V.
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21. A resonant power converter comprising:
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a power converting portion (2) including main switching devices (3a-3f) for a plurality of phases, the power converting portion having an upper arm and a lower arm; a resonant circuit (8) connected to the power converting portion, and including a resonant capacitor (6) and a resonant reactor (7) connected to the resonant capacitor; means for short-circuiting the upper arm and the lower arm to each other to enable resonance to be caused by the resonant circuit; and means for switching the main switching devices to implement commutation during a presence of the resonance. - View Dependent Claims (22, 23)
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24. A resonant power converter comprising:
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a power converting portion (2) including upper and lower arms, main switching devices (3a-3f) in the upper and lower arms respectively, and flywheel diodes (4a-4f) connected in antiparallel with the main switching devices respectively; a resonant circuit (8) connected to the power converting portion, and including a resonant capacitor (6) and a resonant reactor (7) connected in series with the resonant capacitor; and control means (13) for short-circuiting the upper and lower arms to each other to enable resonance to be caused by the resonant circuit, and for switching a designated switching device among the main switching devices when the resonance causes a current to flow through one of the flywheel diodes which is connected in antiparallel with the designated switching device. - View Dependent Claims (25, 26, 27)
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28. A resonant power converter comprising:
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a positive bus line; a negative bus line; a power converting portion connected between a DC power source and a load for implementing power conversion, the power converting portion including a plurality of main switching devices connected in series and provided between the positive bus line and the negative bus line, and a plurality of flywheel diodes commented antiparallel with the main switching devices respectively for each phase; a resonant circuit connected between the positive bus line and the negative bus line, and including a resonant capacitor and a resonant reactor connected in series with the resonant capacitor; and control means for switching the main switching devices in accordance with a predetermined pattern to enable the power converting portion to implement power conversion; wherein the control means turns on a first switching device which should turn on based on the gate signal command, the output signal of the gate signal circuit, among the main switching devices to start resonance to be implemented by the resonant capacitor and the resonant reactor, and the control means turns off a second switching device which should turn off based on the gate signal command, the output signal of the gate signal circuit, among the main switching devices; and wherein the control means comprises first means for detecting whether or not a voltage between the positive bus line and the negative bus line is negative, and second means for turning off the second switching device when the first means detects that the voltage between the positive bus line and the negative bus line is negative.
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Specification