Bidirectional power converter having a charger and export modes of operation
First Claim
Patent Images
1. A bidirectional power converter comprising:
- a H-bridge circuit including;
a DC interface including a positive DC terminal and a negative DC terminal;
a first H-bridge leg coupled across the DC interface, the first H-bridge leg including a first switching circuit controlled by a first switching signal, and a second switching circuit coupled to the first switching circuit in series and controlled by a second switching signal; and
a second H-bridge leg coupled across the DC interface, the second H-bridge leg including a third switching circuit controlled by a third switching signal, and a fourth switching circuit coupled to the third switching circuit in series and controlled by a fourth switching signal; and
a cyclo-inverter circuit electrically coupled to the H-bridge circuit, the cyclo-inverter circuit including;
an AC interface including a first AC line terminal and a second AC line terminal;
a first cyclo-inverter leg including a fifth switching circuit controlled by a fifth switching signal, and a sixth switching circuit coupled to the fifth switching circuit in series and controlled by a sixth gating signal, wherein the first AC line terminal is coupled between the fifth switching circuit and the sixth switching circuit, and wherein in a charger mode of operation, the duty cycles of the fifth switching signal and the sixth switching signal are varied; and
a second cyclo-inverter leg including a seventh switching circuit controlled by the sixth gating signal, and an eight switching circuit coupled to the seventh switching circuit in series and controlled by the fifth switching signal, wherein the second AC line terminal is coupled between the fifth switching circuit and the sixth switching circuit.
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Abstract
A bidirectional power converter that can be used in an electric vehicle to perform AC to DC power conversion to charge the electric vehicle'"'"'s battery and to perform DC to AC power conversion to export power to run external electrical loads is described. The bidirectional power converter may include an AC interface coupled to a cyclo-inverter circuit, and a DC interface coupled to a H-bridge circuit. The cyclo-inverter can be electrically coupled to the H-bridge circuit through a transformer. The bidirectional power converter may include a neutral terminal on the AC interface that is coupled to the transformer through a filtering inductor.
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Citations
19 Claims
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1. A bidirectional power converter comprising:
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a H-bridge circuit including; a DC interface including a positive DC terminal and a negative DC terminal; a first H-bridge leg coupled across the DC interface, the first H-bridge leg including a first switching circuit controlled by a first switching signal, and a second switching circuit coupled to the first switching circuit in series and controlled by a second switching signal; and a second H-bridge leg coupled across the DC interface, the second H-bridge leg including a third switching circuit controlled by a third switching signal, and a fourth switching circuit coupled to the third switching circuit in series and controlled by a fourth switching signal; and a cyclo-inverter circuit electrically coupled to the H-bridge circuit, the cyclo-inverter circuit including; an AC interface including a first AC line terminal and a second AC line terminal; a first cyclo-inverter leg including a fifth switching circuit controlled by a fifth switching signal, and a sixth switching circuit coupled to the fifth switching circuit in series and controlled by a sixth gating signal, wherein the first AC line terminal is coupled between the fifth switching circuit and the sixth switching circuit, and wherein in a charger mode of operation, the duty cycles of the fifth switching signal and the sixth switching signal are varied; and a second cyclo-inverter leg including a seventh switching circuit controlled by the sixth gating signal, and an eight switching circuit coupled to the seventh switching circuit in series and controlled by the fifth switching signal, wherein the second AC line terminal is coupled between the fifth switching circuit and the sixth switching circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for converting power, the method comprising:
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receiving an input power signal; generating a power carrier signal based on the input power signal and having alternating pulses of positive voltage and negative voltage; modulating pulse widths of the alternating pulses in the power carrier signal; applying the modulated power carrier signal to a first winding of a transformer; receiving the modulated power carrier signal at a second winding of the transformer; and rectifying the modulated power carrier signal received at the second winding of the transformer to generate an output power signal, wherein when the input power signal is an input AC power signal, the output power signal is a output DC power signal, the method further comprises; receiving the input AC power signal at a recursive filter; determining a frequency of the input AC power signal; correlating the determined frequency to a frequency band; and updating coefficients of the recursive filter based on the frequency band, and wherein when the input power signal is an input DC power signal, the output power signal is an output AC power signal and the modulated power carrier signal does not include a line frequency component of the output AC power signal. - View Dependent Claims (17)
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18. A bidirectional power converter comprising:
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a H-bridge circuit including; a DC interface including a positive DC terminal and a negative DC terminal; a first H-bridge leg coupled across the DC interface, the first H-bridge leg including a first switching circuit controlled by a first switching signal, and a second switching circuit coupled to the first switching circuit in series and controlled by a second switching signal; and a second H-bridge leg coupled across the DC interface, the second H-bridge leg including a third switching circuit controlled by a third switching signal, and a fourth switching circuit coupled to the third switching circuit in series and controlled by a fourth switching signal; a cyclo-inverter circuit electrically coupled to the H-bridge circuit, the cyclo-inverter circuit including; an AC interface including a first AC line terminal and a second AC line terminal; a first cyclo-inverter leg including a fifth switching circuit controlled by a fifth switching signal, and a sixth switching circuit coupled to the fifth switching circuit in series and controlled by a sixth gating signal, wherein the first AC line terminal is coupled between the fifth switching circuit and the sixth switching circuit; and a second cyclo-inverter leg including a seventh switching circuit controlled by the sixth gating signal, and an eight switching circuit coupled to the seventh switching circuit in series and controlled by the fifth switching signal, wherein the second AC line terminal is coupled between the fifth switching circuit and the sixth switching circuit; and an AC tracker for filtering an input AC signal at the AC interface, the filtered input AC signal being used for controlling the switching circuits of the bidirectional power converter in a charger mode of operation. - View Dependent Claims (19)
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Specification