Self-oscillating switching regulator with frequency responsive feedback loop gain control

Claim 2

A self-oscillating switching regulator to derive a regulated voltage from an unregulated source comprising an input and an output, a switching device coupling said input and output, a voltage regulation feedback loop to control said switching device, said voltage regulation feedback loop including a controllable signal gain means and means to clip feedback signals in said voltage regulation loop, a frequency-to-voltage converter responsive to the switching frequency of said switching device, and means to utilize the output of said converter to control said controllable signal gain means.

Claim 3

A self-oscillating switching regulator as defined in claim 1 wherein said controllable signal gain means comprises a source of reference voltage and a pair of differentially coupled amplifier devices, one of said amplifier devices responsive to said converter, the other amplifier Device responsive to the reference voltage, and said means to clip comprises two overdriven cascaded logic gates coupling the output of said first amplifier device to said switching device.

Claim 4

A self-oscillating switching regulator as defined in claim 2 wherein said logic gates comprise NOR gates and said pair of amplifier devices comprise two emitter-coupled transistors.

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 loop responsive to the voltage at said output terminal and coupled to said control electrode, said voltage regulating feedback loop sustaining self-oscillatory switching of said switching device, a frequency-to-voltage converter responsive to the frequency of said switching device, a reference voltage source, means to generate a voltage responsive to the difference between the voltage output of said converter and said reference voltage, and said means to generate a voltage including a variable gain device included in said voltage regulating feedback loop and responsive to the voltage output of said frequency-to-voltage converter, whereby the controlled variation in said variable gain device adjusts the feedback loop gain to regulate the switching frequency of said switching device.

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 loop responsive to the voltage at said output terminal and coupled to said control electrode, said voltage regulating feedback loop sustaining self-oscillatory switching of said switching device, a frequency-to-voltage converter responsive to the frequency of said switching device, a reference voltage source, means to generate a voltage responsive to the difference between the voltage output of said converter and said reference voltage, and said means to generate a voltage including a variable gain device included in said voltage regulating feedback loop and responsive to the voltage output of said frequency-to-voltage converter, whereby the controlled variation in said variable gain device adjusts the feedback loop gain to regulate the switching frequency of said switching device.

Claim 7

A self-oscillating switching regulator as defined in claim 4 wherein said means to generate a voltage includes a first transistor to function as said variable gain device, and biased by the voltage output of said frequency to voltage converter, a second transistor biased by said reference voltage, said first and second transistors being emitter coupled in a differential amplifier configuration, and said voltage regulating feedback loop including two cascaded NOR logic gates coupled to the output of said differential amplifier.