Antiparallel commutated inverter
First Claim
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1. A control system for regulating power input to a resonant electrical load from a dc source having first and second terminals, the combination comprising:
- a magnetic means connected between said first and second terminals to receive power from said source;
a first switching device between the magnetic means and said first terminal and a second switching device between said magnetic means and said second terminal operable to commutate the flow of power from the respective terminal to the magnetic means when the switching device is interrupted;
a first anti-parallel means connected across said first switching device and a second anti-parallel means connected across said second switching device; and
a series resonant load connected with said magnetic means to receive power through the magnetic means from said dc source whereby by the selective commutation of said switching devices the power input to the load from the source can be regulated while said first and second anti-parallel means serve to provide a path for reverse current from the load around the respective switching device as the associated switching device is commutated.
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Abstract
A control circuit for regulating power to a resonant load from a dc source including switching devices, magnetic means and antiparallel means for increasing the reverse voltage on the switching devices, reducing the dv/dt stresses on the switching devices, reducing the likelihood of a crowbar or shoot through of the switching devices and obtaining the ability of recovering from a shoot through without device failure or circuit interruption.
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Citations
21 Claims
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1. A control system for regulating power input to a resonant electrical load from a dc source having first and second terminals, the combination comprising:
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a magnetic means connected between said first and second terminals to receive power from said source; a first switching device between the magnetic means and said first terminal and a second switching device between said magnetic means and said second terminal operable to commutate the flow of power from the respective terminal to the magnetic means when the switching device is interrupted; a first anti-parallel means connected across said first switching device and a second anti-parallel means connected across said second switching device; and a series resonant load connected with said magnetic means to receive power through the magnetic means from said dc source whereby by the selective commutation of said switching devices the power input to the load from the source can be regulated while said first and second anti-parallel means serve to provide a path for reverse current from the load around the respective switching device as the associated switching device is commutated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A control for regulating power input to an electrical load from a dc source having first and second terminals, said control comprising,
magnetic means connected across the terminals to receive power from the dc source; -
first and second switching means connected to interrupt the flow of power from the first and second terminals respectively, to the magnetic means; first and second circuit means connected in parallel with the first and second switching means for providing a reverse current flow path around the switching means when that switching means is interrupted, said first and second circuit means including voltage means for interacting with the reverse load current to establish a significant reverse voltage across the associated switching means; and circuit means for transmitting energy from the dc source and through the magnetic means to the load. - View Dependent Claims (16, 17, 18)
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11. A circuit for commutating a switching device using anti-parallel type commutation, said circuit comprising:
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a switching device adapted to interrupt current flow from a dc source; a magnetic means connected in series with said switching device; an anti-parallel means connected in parallel with said switching device and said magnetic means; a series resonant means connected to receive current through the switching device and the magnetic means; commutation control means for causing an interaction between said series resonant means, said magnetic means and said anti-parallel means to establish a significant reverse voltage across the switching device during the commutation of said switching device. - View Dependent Claims (19, 20)
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12. A circuit for commutating a switching device using anti-parallel type commutation comprising:
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a switching device connected to a dc source; a magnetic means; an anti-parallel means connected in parallel with said switching device and said magnetic means; a series resonant means connected to said magnetic means; and commutation control means for causing interaction between said series resonant means, said magnetic means and said anti-parallel means to establish a significant reverse voltage across the said switching device during the commutation of said switching device. - View Dependent Claims (13, 14, 15, 21)
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Specification