Method for limiting the frequency of a voltage-controlled oscill

Details Method for limiting the frequency of a voltage-controlled oscill Method for limiting the frequency of a voltage-controlled oscill

1994-02-07

1995-09-05

Young, Brian K.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 21, 363 97, 363131, H02M 3335

Patent

active

054484669

ABSTRACT:
A method for limiting the frequency of a voltage-controlled oscillator in a control circuit of a resonant converter switched-mode power supply includes adjusting a delay time of a delay element disposed in a feedback branch of the voltage-controlled oscillator with a signal indicating a transition from negative to positive values of a current through an oscillating circuit of the switched-mode power supply. A resonant converter switched-mode power supply has an output voltage and an oscillating circuit with a current. A control circuit for the resonant converter switched-mode power supply includes a control amplifier being acted upon by the output voltage and by a reference voltage. A voltage-controlled oscillator is connected to and triggered by the control amplifier. A comparator detects a transition from positive to negative values of the current in the oscillating circuit. A flip-flop has a setting input being connected to and triggered by the voltage-controlled oscillator and has a reset input being connected to and triggered by the comparator. A delay element has a variable delay time and is triggered by a signal indicating a transition from negative to positive values of the current in the oscillating circuit.

REFERENCES:
patent: 4896255 (1990-01-01), Schlenk et al.
patent: 5032972 (1991-07-01), Erckert
patent: 5053937 (1991-10-01), Blockl

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