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Patent

Average current controlled switching regulator utilizing digital control techniques

Victor B. Boros, +2 more
TLDR
In this paper, the transducer converting current into a signal frequency has a threshold characteristic to insure a definite fixed signal frequency at very low currents, in order to counteract instability problems inherent in current controlled switching type voltage regulators.
Abstract: 
A current controlled switching type voltage regulator achieves voltage regulation by controlling an average current flow through the switching device. This current is sensed and transformed into a signal frequency. The signal frequency is counted to determine its average value and this count is compared to a variable current reference count which is continuously adjusted in response to an output voltage monitor which includes circuitry to generate an error count responsive to the deviation of the voltage output from a desired regulated value. In order to counteract instability problems inherent in current controlled switching type voltage regulators the transducer converting current into a signal frequency has a threshold characteristic to insure a definite fixed signal frequency at very low currents.

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Citations
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Patent

Circuits and methods for synchronizing non-constant frequency switching regulators with a phase locked loop

Christopher B Umminger, +1 more
TL;DR: In this article, the authors proposed a synchronizing non-constant frequency switching regulators with a phase-locked loop to achieve constant frequency operation in steady state while retaining the advantages of non-frequency operation to improve transient response and operate over a wider range of duty cycles.
Patent

Current sharing modular power supply

Christopher P. Henze
Abstract: A regulator circuit for equalizing the load currents of a plurality of power supply modules connected in common to feed a common load. Each of the modules includes a pulse-width modulator for adjusting the duty cycle of the module, thereby to adjust the voltage regulation point and corresponding current output of the module. A current sensor produces a current level signal proportional to the current output of the module. The current level signal is applied through a current amplifier to generate a corresponding variable error voltage. A fixed reference voltage derived from the output voltage and the variable error voltage are applied to the pulse-width modulator to vary the duty cycle so as to produce a decrease in load voltage with an increase in current output and an increase in the load voltage with a decrease in current output thereby equalizing the current output of the module with modules having substantially equal output voltages. A low pass filter interposed in the regulator feedback path assures current sharing under quasi steady-state conditions without degradation of high frequency response to dynamic load changes.
Patent

Switching regulators having a synchronizable oscillator frequency with constant ramp amplitude

Robert C. Dobkin, +1 more
TL;DR: In this paper, a voltage controlled oscillator circuit (VCO) is used to produce signals that turn ON a switch circuit. But the signal generation circuit is used in place of the phase detector circuit.
Patent

DC/DC converter with multiple operating modes

Hiroto Tanaka, +1 more
TL;DR: In this paper, a hysteresis comparator monitors the coil current IL and turns off the switching device when it reaches a comparison current ILP, where ILP > ILB.
Patent

DC/DC converter with reduced power consumpton and improved efficiency

Hiroto Tanaka, +1 more
TL;DR: In this article, a hysteresis comparator monitors the coil current IL and turns off the switching device when it reaches a comparison current ILP, where ILP > ILB.
References
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Patent

Constant current series-switching regulator

Brian McConnell
TL;DR: In this paper, a series switch regulator adjusts the flow of input power by switching ON and OFF, in response to a control signal, and the duty cycle depends on the power demands of the load.
Patent

Switching regulator control utilizing digital comparison techniques to pulse width modulate conduction through a switching device

Victor B. Boros
TL;DR: In this article, a switching regulator includes a digital feedback control circuit to regulate the output voltage and the accumulated count is continuously compared with a reference count, which determines the duty cycle of periodic conduction.
Patent

Converter circuit and method having fast responding current balance and limiting

Patrick L. Hunter
TL;DR: In this article, a regulated voltage converter utilizing an improved method of pulse width modulation is disclosed, where acceptable current balance and limiting in the converter switching elements are speedily achieved within one half cycle of converter operation.
Patent

Digital feedback control utilizing accumulated reference count to regulate voltage output of switching regulator

Norman Richards Miller
TL;DR: In this article, a digital feedback control for a switching regulator utilizes interrelated digital counting circuits to provide a combined proportional, integral and differential feedback, and the response time of the feedback control is improved by generating a simultaneous interrelated feedback signal.
Patent

System for controlling power applied to a gas discharge lamp

James E. Dragoset
TL;DR: In this paper, a system for controlling power applied to a gas discharge lamp by an AC source is presented, where the power dissipated in the lamp during a half cycle is sensed by a measuring circuit.