Switched Power Converter
First Claim
Patent Images
1. A power converter, comprising:
- a DC port;
an AC port;
a central resonant circuit;
a set of controllable “
DC”
switches electrically communicating with said DC port and said central resonant circuit;
a filter electrically communicating with said AC port, said filter generating a voltage during operation of said converter;
a set of “
AC”
switches electrically communicating with the central resonant circuit and said filter;
a switch control circuit responsive to phase order, to secondary-to-tertiary time percentage, and to inversion time percentage for controlling inversion and normal conduction times of said DC and AC switches; and
a modulator responsive to said voltage at said DC port, to said voltage of said filter, to current command signals, and to the voltage at the AC port, for generating the phase order, inversion time percentage and secondary-to-tertiary time percentages.
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Abstract
A power converter includes a DC port and an AC port. A set of controllable “DC” switches couples the DC port to a central series-resonant circuit, and a set of “AC switches couples the central circuit through a filter to the AC port. A switch control circuit responds to secondary-to-tertiary and inversion time percentages, and a modulator is responsive to the AC filter voltage and to the current at the AC port, for generating the inversion (inv) and secondary-to-tertiary (s2t) time percentages.
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Citations
12 Claims
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1. A power converter, comprising:
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a DC port; an AC port; a central resonant circuit; a set of controllable “
DC”
switches electrically communicating with said DC port and said central resonant circuit;a filter electrically communicating with said AC port, said filter generating a voltage during operation of said converter; a set of “
AC”
switches electrically communicating with the central resonant circuit and said filter;a switch control circuit responsive to phase order, to secondary-to-tertiary time percentage, and to inversion time percentage for controlling inversion and normal conduction times of said DC and AC switches; and a modulator responsive to said voltage at said DC port, to said voltage of said filter, to current command signals, and to the voltage at the AC port, for generating the phase order, inversion time percentage and secondary-to-tertiary time percentages. - View Dependent Claims (2, 3, 4)
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5. A controller for a power converter, said controller comprising:
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a switch element controller for generating on-off control signals for first and second controllable switch sets of said a power converter in response to inversion and secondary-to-tertiary time percentages; and a modulator responsive to a filter voltage of a filter of said power converter and to a current at an AC port of the power converter, for generating the inversion and secondary-to-tertiary time percentages. - View Dependent Claims (6)
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7. A power converter, comprising:
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a DC port; an AC port; a central resonant circuit; a set of controllable “
DC”
switches electrically communicating with said DC port and said central resonant circuit;a filter electrically communicating with said AC port, said filter generating a voltage during operation of said converter; a set of “
AC”
switches electrically communicating with the central resonant circuit and said filter;an internal command generator for calculating the currents at the AC port to satisfy at least the desired converter power and DC voltage, and for generating internal current commands representing said currents at the AC port; a switch control circuit electrically communicating with said DC and AC switches, for selecting the active switches in response to sensor feedback and said internal current commands, and for calculating switch ON and OFF times using “
inversion” and
“
secondary-to-tertiary”
time commands; anda modulator responsive to said internal current commands, for calculating the required percentage of “
inversion” and
“
secondary-to-tertiary”
time percentages to satisfy the current commands from the internal command generator.
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11. A power converter according to claim 10, wherein said central resonant circuit is a series resonant circuit.
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12. A method for controlling a power converter, said method comprising the steps of:
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generating the inversion and secondary-to-tertiary time percentages in response to a voltage produced by a filter of the power converter and a current at an AC port of the power converter; and generating on-off control signals for first and second controllable switch sets of the power converter in response to inversion and secondary-to-tertiary time percentages.
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Specification