Universal power supply, independent converter stages for respective hardware components of a computerized system
First Claim
1. In a power supply, power supply transformer means having primarywinding means and secondary winding means, rectifier means having alternating polarity input means for receiving input alternating current potentials over a range from about one hundred volts r.m.s. to at least about two hundred and twenty volts r.m.s., and having unidirectional output means,control circuit means including current control switch means interposed between said unidirectional output means and said primary winding means for supplying generally constant volt-second product to said primary winding means for input alternating current potentials over said range between about one hundred volts and at least about two hundred and twenty volts, anddirect current input means coupled between said unidirectional output means and said current control switch for receiving direct current input voltages over a range from about one hundred and thirteen volts to about three hundred and thirty volts,said current control switch means being selectively energizable for activating said primary winding means in response to alternative current power applied to said alternating polarity input means and in response to direct current power applied to said direct current input means.
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Accused Products
Abstract
In a point of sale terminal it was desired to incorporate a variety of input/output devices, e.g. CRT display, disk drives and a printer in a compact hosuing, e.g. about 16 inches wide by 12 inches in depth (without frontally projecting keyboard) by about 11 inches high. The illustrated switching power supply occupies a rectilinear space of less than 155 cubic inches and has the capability of operating from either 110 or 220 VAC, 50 or 60 hertz, or from battery power, with essentially constant volt-second product, while supplying a maximum average output power greater than 120 watts, and a peak output power of greater than 280 watts.
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Citations
24 Claims
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1. In a power supply, power supply transformer means having primary
winding means and secondary winding means, rectifier means having alternating polarity input means for receiving input alternating current potentials over a range from about one hundred volts r.m.s. to at least about two hundred and twenty volts r.m.s., and having unidirectional output means, control circuit means including current control switch means interposed between said unidirectional output means and said primary winding means for supplying generally constant volt-second product to said primary winding means for input alternating current potentials over said range between about one hundred volts and at least about two hundred and twenty volts, and direct current input means coupled between said unidirectional output means and said current control switch for receiving direct current input voltages over a range from about one hundred and thirteen volts to about three hundred and thirty volts, said current control switch means being selectively energizable for activating said primary winding means in response to alternative current power applied to said alternating polarity input means and in response to direct current power applied to said direct current input means.
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14. In a power supply,
power supply transformer means having primary winding means and secondary winding means, rectifier means having alternating polarity input means for receiving input alternating current potentials over a range from about one hundred volts r.m.s. to at least about two hundred and twenty volts r.m.s., and having unidirectional output means, and control circuit means including current control switch means interposed between said unidirectional output means and said primary winding means for supplying generally constant volt-second product to said primary winding means for input alternating current potentials over said range between about one hundred volts and at least about two hundred and twenty volts, further rectifier means coupled with the secondary winding means and having a rectifier output for supplying relatively low voltage unidirectional current, plural converter stages for selective coupling in parallel with said secondary winding means, power "OR" means having first and second inputs, and having power "OR" output means coupled with said plural converter stages, and standby battery coupling means connected with the second input of said power "OR" means for selectively coupling standby battery power with said plural converter stages.
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21. In a power supply,
power supply transformer means having primary winding means and secondary winding means, rectifier means having alternating polarity input means for receiving input alternating current potentials over a range from about one hundred volts r.m.s. to at least about two hundred and twenty volts r.m.s., and having unidirectional output means, and control circuit means including current control switch means interposed between said unidirectional output means and said primary winding means for supplying generally constant volt-second product to said primary winding means for input alternating current potentials over said range between about one hundred volts and at least about two hundred and twenty volts, plural converter stages coupled in parallel with said secondary winding means, said plural converter stages supplying a maximum output power greater than about one hundred watts, and said power supply occupying a rectilinear space with a volume of less than about one hundred and sixty-five cubic inches, and respective individual independent feedback pulse width modulation control circuits in the respective converter stages.
Specification