Regulated power supply including forward feed

Claim 2

A power supply circuit for providing a regulated voltage at a pair of output terminals, said circuit comprising: first means for providing an unregulated input signal; a transformer having a primary and a secondary winding being connected in circuit with said output terminals; regulating means connected in circuit with said first means and said primary winding; a control loop connected between at least one of said output terminals and said regulating means, for controlling the state of current conduction of said regulating means in response to the voltage provided at said output terminals, said control loop including a pulse width modulator having a transfer function of pulse width versus control voltage, said transfer function having a particular slope; and second means connected in circuit with said secondary winding and said control loop for providing a signal effective to alter the slope of said transfer function in a manner to compensate for variations in said input signal and thereby to maintain said regulated voltage at said pair of output terminals.

Claim 3

The circuit according to claim 1 wherein said second means includes a peak detector and a current source connected in circuit with said secondary winding.

Claim 4

The circuit according to claim 2 wherein said pulse width modulator includes a ramp generator responsive to the signals provided from said current source for altering the slope of said transfer function.

Claim 5

The circuit according to claim 3 wherein said peak detector comprises a diode and a capacitor connected in circuit with said secondary winding.

Claim 6

The circuit according to claim 4 wherein said current source comprises a transistor in a common base configuration.

Claim 7

A switching power supply regulator circuit for providing a regulated voltage at a pair of output terminals, said circuit comprising: first means for providing an unregulated input signal; a transformer having a primary winding and a secondary winding, said secondary winding having an intermediate terminal and further being connected in circuit with said output terminals; a switch regulator means connected in circuit with said first means and said primary winding; a control loop connected between at least one of said output terminals and said switch regulator means, said loop comprising: a. a comparator means for comparing a signal related to the voltage at said at least one output terminal and a reference signal and for providing a control signal in response to the comparison; and b. a pulse width modulator means responsive to said control signal for controlling the state of current conduction of said switch regulator means, said modulator having a particular transFer function of pulse width versus applied control voltage associated therewith; second means, connected in circuit with said secondary winding and said control loop, comprising a peak detector and a current source, for providing a signal to said pulse width modulator to compensate for variations in said input signal by altering said transfer function and thereby to maintain said regulated voltage at said pair of output terminals.

Claim 8

A switching power supply regulator circuit for providing a regulated voltage at a pair of output terminals, said circuit comprising: first means for providing an unregulated input signal; a transformer having a primary winding and a secondary winding, said secondary winding having an intermediate terminal and further being connected in circuit with said output terminals; a switch regulator means connected in circuit with said first means and said primary winding; a control loop connected between at least one of said output terminals and said switch regulator means, said loop comprising: a. a comparator means for comparing a signal related to the voltage at said at least one output terminal and a reference signal and for providing a control signal in response to the comparison; and b. a pulse width modulator means responsive to said control signal for controlling the state of current conduction of said switch regulator means, said modulator having a particular transFer function of pulse width versus applied control voltage associated therewith; second means, connected in circuit with said secondary winding and said control loop, comprising a peak detector and a current source, for providing a signal to said pulse width modulator to compensate for variations in said input signal by altering said transfer function and thereby to maintain said regulated voltage at said pair of output terminals.

Claim 9

The circuit according to claim 6 wherein said peak detector comprises a diode and capacitor connected in circuit with one end of said secondary winding and said intermediate terminal.

Claim 10

The circuit according to claim 7 wherein said current source comprises a transistor in a common base configuration.

Claim 11

The circuit according to claim 8 wherein said pulse width modulator circuit comprises a ramp generator for providing a ramp waveform and wherein said current source provides a signal for controlling the slope of the ramp waveform.

Claim 12

The circuit according to claim 9 wherein said pulse width modulator further comprises a second comparator means for comparing the composite of said ramp waveform and said control signal with another reference signal and for providing a second control signal in response thereto.

Claim 13

The circuit according to claim 10 wherein said pulse width modulator further comprises a driver circuit responsive to said second control signal for providing driver control signals to said switching regulator means.