Resonant inverter apparatus
First Claim
1. A resonant inverter apparatus comprising:
- a DC voltage source for generating a DC voltage;
an inverter portion connected to the positive and negative rails of the DC voltage source, the inverter portion including upper main switches and lower main switches being series-coupled in each phase, main switching devices provided in the upper and lower main switches respectively, and flywheel diodes connected in antiparallel with the main switching devices respectively;
bus-splitting means connected to the positive and negative rails of the DC voltage source, or a variable DC source connected to the negative rail of the DC voltage source;
a resonant circuit portion connected to the junction of a pair of series-coupled bus splitting means or the other terminal of a variable DC source and the inverter portion, the resonant circuit portion including resonant reactors, auxiliary switches, and resonant capacitors, the resonant reactors and the auxiliary switches being connected in series circuits, the series circuits being connected between the junction of a pair of series-coupled bus splitting means and the junctions of the respective phases in the inverter portion, the resonant capacitors being connected in parallel with the series circuits respectively;
current detection means for detecting currents flowing through the resonant reactors; and
gate drive means for turning on an auxiliary switch, which is in the series circuit connected to the junction between series-coupled main switches of a phase to be switched, among the auxiliary switches to cause resonance by the related resonant reactor and the related resonant capacitor, for enabling main switching devices, which are of the phase to be switched, among the main switching devices to implement zero-voltage switching, and for turning off the auxiliary switch in the series circuit connected to the junction between series-coupled main switches of the phase to be switched when the current flowing through the related resonant reactor which is detected by the current detection means becomes substantially zero.
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Accused Products
Abstract
An inverter portion (2) includes upper main switches and lower main switches of different phases, main switching devices (3a-3f) provided in the upper main switches and the lower main switches respectively, and diodes (4a-4f) connected in antiparallel with the main switching devices (3a-3f) respectively. Bus-splitting portions (1D, 1E, 1F, 6, 7) are connected to each other at a bus-splitting junction. A resonant circuit portion (8) includes resonant reactors (9a-9c), auxiliary switches (11a-11c), and resonant capacitors (10a-10c). The resonant reactors (9a-9c) and the auxiliary switches (11a-11c) are connected in series circuits. The series circuits are connected between the bus-splitting junction and the junctions between series-coupled main switches. The resonant capacitors (10a-10c) are connected in parallel with the series circuits respectively. A gate drive portion (12) operates for turning on an auxiliary switch, which is in the series circuit connected to the junction between the series-coupled main switches of a phase to be switched, among the auxiliary switches (11a-11c). The gate drive portion (12) operates for enabling main switching devices, which are of the phase to be switched, among the main switching devices (3a-3f) to implement zero-voltage switching. The gate drive portion (12) operates for turning off the auxiliary switch in the series circuit connected to the junction between the series-coupled main switches of the phase to be switched when a current flowing through the related resonant reactor becomes substantially zero.
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Citations
27 Claims
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1. A resonant inverter apparatus comprising:
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a DC voltage source for generating a DC voltage; an inverter portion connected to the positive and negative rails of the DC voltage source, the inverter portion including upper main switches and lower main switches being series-coupled in each phase, main switching devices provided in the upper and lower main switches respectively, and flywheel diodes connected in antiparallel with the main switching devices respectively; bus-splitting means connected to the positive and negative rails of the DC voltage source, or a variable DC source connected to the negative rail of the DC voltage source; a resonant circuit portion connected to the junction of a pair of series-coupled bus splitting means or the other terminal of a variable DC source and the inverter portion, the resonant circuit portion including resonant reactors, auxiliary switches, and resonant capacitors, the resonant reactors and the auxiliary switches being connected in series circuits, the series circuits being connected between the junction of a pair of series-coupled bus splitting means and the junctions of the respective phases in the inverter portion, the resonant capacitors being connected in parallel with the series circuits respectively; current detection means for detecting currents flowing through the resonant reactors; and gate drive means for turning on an auxiliary switch, which is in the series circuit connected to the junction between series-coupled main switches of a phase to be switched, among the auxiliary switches to cause resonance by the related resonant reactor and the related resonant capacitor, for enabling main switching devices, which are of the phase to be switched, among the main switching devices to implement zero-voltage switching, and for turning off the auxiliary switch in the series circuit connected to the junction between series-coupled main switches of the phase to be switched when the current flowing through the related resonant reactor which is detected by the current detection means becomes substantially zero. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A resonant power converter apparatus comprising:
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a positive rail and a negative rail connected to a DC voltage source; a power conversion circuit portion provided between the positive rail and the negative rail, the power conversion circuit portion including main switching devices forming upper and lower arms of different phases respectively, and flywheel diodes connected in antiparallel with the main switching devices respectively, the power conversion circuit portion performing power conversion for converting a DC voltage of the DC voltage source into an AC voltage; a voltage output circuit portion outputting a given voltage equal to or lower than a voltage applied between the positive rail and the negative rail; a resonant circuit portion including series connection circuits connected between the voltage output circuit portion and junctions between the upper and lower arms of the different phases respectively, the series connection circuits including resonant reactors and auxiliary switches, the resonant circuit portion including resonant capacitors connected in parallel with the series connection circuits respectively; and a controller for turning on the auxiliary switch of the series connection circuit connected to the junction between the upper and lower arms of the phase to be switched to cause the related resonant reactor and the related resonant capacitor to make resonance, for zero-voltage-switching the main switching devices of the phase to be switched, and for turning off said turned-on auxiliary switch when detecting that a current flowing through said resonant reactor becomes zero. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification