Self-oscillating constant frequency switching regulator with phase control of voltage regulation loop

Claim 2

A self-oscillating switching regulator to derive a regulated voltage from an unregulated voltage source comprising an input and an output, a switching device coupling said input and output, a voltage regulation feedback circuit to control said switching device including an amplifier device responsive to the voltage at said output, said voltage regulation circuit further including means to control the phase of signals in the voltage regulation circuit, a frequency-to-voltage converter responsive to the switching frequency of said switching device, said means to control the phase of signals including means to vary the reactance of said voltage feedback circuit comprising a reactive device and a variable impedance device connected in series, said series connection shunting said amplifier device, and said variable impedance device coupled to and responsive to said frequency-to-voltage converter.

Claim 3

A self-oscillating switching regulator as defined in claim 1 wherein said variable impedance device comprises a second amplifier device connected in series with said reactive device, and the conductivity of said second amplifier device being responsive to said frequency-to-voltage converter.

Claim 4

A self-oscillating switching regulator as defined in claim 2 wherein said frequency-to-voltage converter comprises a pulse differentiation circuit and a diode pulse counter including a count storage capacitor with a discharge path to drain said storage capacitor, and said voltage across said storage capacitor being coupled to said second amplifier device.

Claim 5

A self-oscillating switching regulator to supply a regulated output voltage from an unregulated voltage source comprising input and output terminals, a switching device interconnecting said input and output terminals and including a control electrode to control switching therein, a voltage regulating feedback circuit including the conducting path of an amplifying device having an input electrode coupled to and responsive to the voltage at said output terminal and coupled to said control electrode, a frequency-to-voltage converter responsive to the frequency of switching of said switching device, a signal phase control circuit in said feedback circuit including an energy storage device and an electronically controllable impedance responsive to said converter connected in series, said series connection shunting said amplifying device whereby the impedance and energy storage characteristics of said phase control circuit are altered in response to variations in the frequency of switching of said switching device to compensate for these frequency variations.

Claim 6

A self-oscillating switching regulator to supply a regulated output voltage from an unregulated voltage source comprising input and output terminals, a switching device interconnecting said input and output terminals and including a control electrode to control switching therein, a voltage regulating feedback circuit including the conducting path of an amplifying device having an input electrode coupled to and responsive to the voltage at said output terminal and coupled to said control electrode, a frequency-to-voltage converter responsive to the frequency of switching of said switching device, a signal phase control circuit in said feedback circuit including an energy storage device and an electronically controllable impedance responsive to said converter connected in series, said series connection shunting said amplifying device whereby the impedance and energy storage characteristics of said phase control circuit are altered in response to variations in the frequency of switching of said switching device to compensate for these frequency variations.

Claim 7

A self-oscillating switching regulator as defined in claim 4 wherein the conducting path of said amplifying device included in said voltage regulating feedback circuit comprises the collector-emitter path of a first transistor, said phase control circuit comprises a second transistor and a capacitor connected in series with the collector-emitter path of said second transistor, and said phase control circuit and said first transistor being connected in parallel.

Claim 8

A self-Oscillating switching regulator as defined in claim 5 wherein said frequency-to-voltage converter includes means to integrate the output of said switching regulator, and means to utilize said integrated output to control said phase control circuit including a source of reference voltage.