Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1994-12-13
1996-03-12
Cunningham, Terry
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327540, 327541, 327546, 327101, 327114, 363 21, 363 97, 331111, H02M 3335, G05F 110
Patent
active
054989957
ABSTRACT:
Improved controller circuitry for a switching power supply is disclosed. The switching power supply is of the type having a transformer having primary and secondary windings for generating an output voltage at the secondary winding, a power switch for driving the primary winding, and controller circuitry for activating the power switch. The improved controller circuitry includes an oscillator and frequency shift means. The oscillator generates PWM pulses having a predetermined frequency for use in activating the power switch. The frequency shift means gradually shifts the frequency of the PWM pulses at a shift rate in response to the output voltage decreasing to below a threshold level. In another embodiment, a controller for use in a switching power supply includes an oscillator for generating PWM pulses having a predetermined frequency which determine the switching condition of the supply. Frequency shift means is used gradually shifting the frequency of the PWM pulses at a shift rate in response to an output voltage of the switching power supply decreasing to below a threshold level, and programming means is used for programming the shift rate and the threshold level.
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Brian P. Erisman, Fernando Martin and Richard Redl, "A Novel Primary-Side Controller and an Error Signal Isolator in Low Cost Five-Pin Packages", IEEE Applied Power Electronics Conference and Expositions, Conference Proceedings 1993, pp. 369-379.
Santo Hendrik
Szepesi Thomas
Cunningham Terry
National Semiconductor Corporation
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