Switching power supply with an injection signal frequency lockin

Details Switching power supply with an injection signal frequency lockin Switching power supply with an injection signal frequency lockin

1988-12-22

1989-08-15

Wong, Peter S.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

363 17, 363 98, H02M 108

Patent

active

048580970

ABSTRACT:
A switching power supply with an injection signal frequency locking circuit is described comprising a switched transformer controlled by a pulse width modulator. The pulse width modulator output is in turn controlled by an error signal form the output of the power supply such that as the potential on the output of the power supply increases, the duration of the pulses on the output of the pulse width modulator decreases; and conversely, as the potential on the output of the power supply decreases, the pulse duration on the output of the pulse width modulator increases. The increasing and decreasing of the pulse duration on the output of the pulse width modulator controls the length of time that a potential is applied across the primary of the transformer so as to hold the potential on the output of the power supply to a predetermined value. The frequency of the oscillator is fixed by choosing the free-running frequency of the oscillator to be slightly less than a desired fixed predetermined frequency. A signal having the desired fixed predetermned frequency is then injected into the oscillator to reset the oscillator so that the fixed predetermined frequency forces the oscillator to output a sawtooth at the fixed predetermined frequency.

REFERENCES:
patent: 3624486 (1971-11-01), Oates
patent: 3967173 (1976-06-01), Stich
patent: 4502105 (1985-02-01), Jessee
patent: 4685040 (1987-08-01), Steigerwald et al.

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