Regenerative DC power supply
First Claim
1. A regenerative DC power supply operable from an AC line comprising:
- an input connected to the AC line;
an output connected to a DC bus;
a plurality of rectifier devices connected between the input and the output to provide full wave rectification at the output;
a transistor switching circuit connected in anti-parallel with each of said plurality of rectifiers; and
,control means controlling each transistor switching circuit for conduction during an appropriate time period to conduct regenerative power from the DC bus to the AC line.
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Accused Products
Abstract
A DC power supply is disclosed which returns excessive regenerative energy to the AC line. The regenerative power supply generates a DC bus voltage from an AC power line and regulates the maximum DC bus voltage by returning to the AC power line energy supplied through the DC bus from the load. A conventional full wave rectifier bridge is used to rectify the incoming AC power line voltage into a DC bus voltage. A capacitor is connected across the DC bus to dampen high frequency transient voltages which may be present on the DC bus voltage. In anti-parallel with each of the rectifying diode circuits is a power transistor which is controllable to allow current conduction in a direction opposite to its associated rectifying diode. Control circuitry, associated with each of the anti-parallel transistors, senses excessive DC bus voltage and initiates conduction of the transistor when the AC power line phases are at the correct potential for receiving the regenerative energy.
19 Citations
8 Claims
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1. A regenerative DC power supply operable from an AC line comprising:
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an input connected to the AC line; an output connected to a DC bus; a plurality of rectifier devices connected between the input and the output to provide full wave rectification at the output; a transistor switching circuit connected in anti-parallel with each of said plurality of rectifiers; and
,control means controlling each transistor switching circuit for conduction during an appropriate time period to conduct regenerative power from the DC bus to the AC line.
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2. A power supply operable from multi-phase AC lines for connection to a regenerative load comprising:
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a full wave bridge rectifying circuit comprising a plurality of diodes connected between the AC lines and a +DC output line and a -DC output line; a plurality of unidirectional semiconductor switches each associated with and connected in anti-parallel around one of the diodes of said full wave bridge; a capacitor connected across the +DC output line and the -DC output line; sensing means for sensing which AC phase line is at the highest potential and which AC phase line is at the lowest potential; control means controlling said semiconductor switches in response to said sensing means for closing the semiconductor switches disposed around the diode connected between the +DC output line and the AC line at the highest potential and disposed around the diode connected between the -DC output line and the AC line at the lowest potential. - View Dependent Claims (3, 4, 5)
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6. A power supply having AC inputs and +DC and -DC outputs comprising:
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a plurality of rectifying diodes, one connected between each AC input and the +DC output and between each AC input and the -DC output; a plurality of transistor switches, one connected around each of said plurality of diodes; and
,control means associated with said plurality of transistor switches for turning on the transistor switch connected to the AC input having the highest potential and the transistor switch connected to the AC input having the lowest potential. - View Dependent Claims (7, 8)
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Specification