초록 ▼

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 po

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.

대표청구항 ▼

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 tw

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.