High frequency switching power converter
First Claim
1. A swithing power converter circuit usable with a DC element and an AC element, comprising:
- selectively bidirectionally operative power converter means having signal controlled switching devices whose selected operations collectively configure said converter means to act in one mode as an inverter capable fo converting DC power supplied by such DC element to AC power usable by such AC element, and in another mode, as a rectifier capable fo converting AC power supplied by such AC element to DC power usable by such DC element, with said switching devices being commonly operable in both of said modes, andsignal means capable of providing pulse with modulated, synchronous control of each of said switching devices, whereby said AC power is pulse width and duty cycle dependent.
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Accused Products
Abstract
A high-frequency switching power conversion circuit is disclosed. The circuit is capable of operating either as an inverter or as a rectifier, by the use of an array of high-power, bidirectional switches. AC waveforms are produced by ROM-based pulse width modulation, the clocking of which may be phase-locked to an active AC load. Analog voltage sense circuitry detects high or low output voltage and alters the base address in ROM to a lower or higher duty cycle waveform, respectively, providing digital regulation of the output. Overcurrent protection circuitry, responsive to an inductive load, alters the pulse width modulation pattern to produce a dynamically clamped output dependent upon high-power, variable frequency loads. No-load detection circuitry drastically reduces the duty cycle on the switching elements, thus conserving energy when not needed.
77 Citations
20 Claims
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1. A swithing power converter circuit usable with a DC element and an AC element, comprising:
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selectively bidirectionally operative power converter means having signal controlled switching devices whose selected operations collectively configure said converter means to act in one mode as an inverter capable fo converting DC power supplied by such DC element to AC power usable by such AC element, and in another mode, as a rectifier capable fo converting AC power supplied by such AC element to DC power usable by such DC element, with said switching devices being commonly operable in both of said modes, and signal means capable of providing pulse with modulated, synchronous control of each of said switching devices, whereby said AC power is pulse width and duty cycle dependent. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A switching power converter circuit usable with a DC element having a pair of terminals and with an AC element that may be active comprising:
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a transformer having a primary coil and a secondary coil having two end taps, said primary coil having a center tap and two end taps, said center tap being connectable to one of such DC element terminals; switch means, responsive to switch control signals, said switch means including diode means shunted across transistor means, said switch means controllably, alternately connecting either of said primary coil end taps to such other DC element terminal; current storage means having a pair of input terminals and a pair of output terminals for storing current supplied by such DC element and such active AC element; plural bidirectional switch means, responsive to switch control signals, each including dual anode-connected series diode means shunted across transistor means, said bidirectional switch means controllably operatively connecting said secondary coil end taps to the two input terminals of said current storage means and, alternately, to one another in such a manner that the two input terminals of said current storage means are connected to one another; and switch controller means capable of supplying said switch control signals to said switch means and said plural bidirectional switch means, whereby said circuit acts in one mode as an inverter, capable of converting DC power supplied by such DC element to AC power usable by such AC element, and another mode as a rectifier capable of converting AC power supplied by such AC element to DC power usable by such DC element, with said bidirectional switch means being commonly operable in both of said modes. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A switching power converter circuit usable with a DC element that may be active and with an AC element that may be active, comprising:
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selectively bidirectionally operative power converter means having signal controlled switching devices whose selected operations collectively configure said converter measn to act, during one fraction of each cycle of suc AC element, as an inverter capable of converting DC power supplied by such active DC element to AC power usable by such AC element and, during another fraction of each cycle of such AC element, as a rectifier capable of converting AC power supplied by such active AC element to DC power usable by such DC element, with said switching devices being commonly operable during both of said fractions of each cycle of such AC element; signal means capable of providing pulse width modulated, synchronous control of each of said switching devices, whereby said AC power and said DC power are pulse width and duty cycle dependent; and means for phase locking said signal means to such active AC element. - View Dependent Claims (19, 20)
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Specification