Bidirectional battery power inverter
First Claim
1. A bidirectional battery power inverter with a DC-DC converter circuit element, to which a battery may be connected, for generating an AC output voltage from a battery voltage of the battery in a discharge mode of operation and for charging the battery in a charge mode of operation, said power inverter including an HF transformer that forms a resonant circuit together with a resonant capacitor,characterized inthat the transformer comprises two windings with a center tap on its primary side, said center tap being connected to a power electronic midpoint circuit with semiconductor switches, a winding to which the resonant capacitor is connected in series being provided on the secondary side,that a DC-AC converter circuit element is provided which lies on the output side of the power inverter and comprises a boost or buck chopper that is connected between the DC-DC converter circuit element and the DC-AC converter circuit element andthat a resonant switching element is distributed in circuit parts having a staggered clock rate,the resonant frequency of the alternating voltage circuit being higher than the clock frequency of a half-bridge.
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Accused Products
Abstract
Disclosed is a bi-directional battery power inverter (1) comprising a DC-DC converter circuit element (3) to which the battery (2) can be connected in order to generate an AC output voltage from a battery (2) voltage in a discharging mode while charging the battery (2) in a charging mode. The inverter (1) further comprises an HF transformer which forms a resonant circuit along with a resonant capacitor (6). In order to increase the efficiency of said battery power inverter, the transformer is provided with two windings (11, 12) with a center tap (20) on the primary side, said center tap (20) being connected to a power electronic center-tap connection with semiconductor switches (21, 31) while a winding (13) to which the resonant capacitor (6) is serially connected provided on the secondary side.
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Citations
18 Claims
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1. A bidirectional battery power inverter with a DC-DC converter circuit element, to which a battery may be connected, for generating an AC output voltage from a battery voltage of the battery in a discharge mode of operation and for charging the battery in a charge mode of operation, said power inverter including an HF transformer that forms a resonant circuit together with a resonant capacitor,
characterized in that the transformer comprises two windings with a center tap on its primary side, said center tap being connected to a power electronic midpoint circuit with semiconductor switches, a winding to which the resonant capacitor is connected in series being provided on the secondary side, that a DC-AC converter circuit element is provided which lies on the output side of the power inverter and comprises a boost or buck chopper that is connected between the DC-DC converter circuit element and the DC-AC converter circuit element and that a resonant switching element is distributed in circuit parts having a staggered clock rate, the resonant frequency of the alternating voltage circuit being higher than the clock frequency of a half-bridge.
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5. A bidirectional battery power inverter with a DC-DC converter circuit element, to which a battery may be connected, for generating an AC output voltage from a battery voltage of the battery in a discharge mode of operation and for charging the battery in a charge mode of operation, said power inverter including an HF transformer that forms a resonant circuit together with resonant capacitors,
characterized in that the transformer comprises two windings with a center tap on its primary side, said center tap being connected to a power electronic midpoint circuit with semiconductor switches, and one winding on the secondary side, said winding being connected to the resonant capacitors at a convergence point, that a DC-AC converter circuit element is provided which lies on the output side of the power inverter and comprises a boost or buck chopper that is connected between the DC-DC converter circuit element and the DC-AC converter circuit element and that a resonant switching element is distributed in circuit parts having a staggered clock rate.
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9. A bidirectional battery power inverter for bidirectionally converting electrical power between a DC side and an AC side of the inverter, the DC side being connectable to a battery the inverter comprising:
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a power electronic midpoint circuit coupled to a primary winding of an HF transformer, and bridge-connected semiconductor elements coupled to a secondary winding of the HF transformer through capacitance, wherein the capacitance in conjunction with a leakage inductance of the HF transformer defines a resonant frequency, a DC/AC converter connected to the DC/DC converter, the DC/AC converter comprising a boost-buck chopper for avoiding voltage-dropping, so that an output nominal voltage is achieved, wherein the power electric midpoint circuit is configured to be operated at an operation frequency lower than the resonant frequency in order to allow for a substantially zero current switching of the power electronic midpoint circuit - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A bidirectional battery power inverter for bidirectionally converting electrical power between a DC side and an AC side of the inverter, the DC side being connectable to a battery, the inverter comprising:
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a DC/DC converter comprising a first and a second power electronic midpoint circuit coupled to corresponding primary windings of a first and second HF transformer, the DC/DC converter further comprising first and second bridge-connected semiconductor elements coupled to corresponding secondary windings of the first and second HF transformer through corresponding coupling capacitances defining a resonant frequency in conjunction with a leakage inductance of the HF transformer a DC/AC converter connected to the DC/DC converter, the DC/AC converter comprising a boost-buck chopper for avoiding voltage-fluctuation, so that an output nominal voltage is achieved wherein the power electronic midpoint circuit is configured to be operated at an operation frequency lower than the resonant frequency in order to allow for a substantially zero current switching of the power electronic midpoint circuit achieved, and wherein the coupling capacitances are each formed by two capacitors connected in series, one tap of the secondary windings of each of the first and second HF transformer being connected to midpoints of the corresponding capacitance.
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Specification