Showing papers on "Buck–boost converter published in 1971"

Pulse-width modulated dc to dc converter with zero percent duty cycle capability

Abstract: A pulse-width modulated DC to DC converter is enabled to operate into short circuits and limit the current output by having the capability of operating at zero percent duty cycle. The regulation feedback loop utilizes a light-emitting diode and phototransistor optical arrangement to permit isolation between the input and output sides of the converter. The light emitting diode is responsive to voltage monitoring and current monitoring circuitry on the output side of the converter. The converter operates in a crossover mode in which the regulation switches from voltage regulation to current regulation or vice versa as load conditions change.

Dc to dc converter with voltage regulation feedback loop achieving isolation between input and output by time domain techniques

Abstract: A DC to DC converter includes a digital type voltage regulation control circuit which permits complete isolation between the input and output circuits. The regulation signals comprise timing pulses coupled by a pulse transformer from voltage monitoring circuitry on the output side of the converter to switching control circuitry on the input side of the converter. The rectifier of the converter utilizes synchronous rectifying transistors driven by a proportional base drive arrangement which utilizes the regenerative action of a current transformer to transform the collector current of the transistor into a base drive current. This proportional base drive arrangement includes a third stored charge sweep-out winding and a diode to permit high frequency operation of the converter rectifier with low voltage high current saturation transistors.

Dc to dc converter with voltage regulation through pulse width modulation by control of the distribution of flux variations in a dual core transformer

Abstract: A DC to DC converter regulates its voltage output by controlling the distribution of flux variations in a dual core transformer included in the converter''s inverter circuit. The inverter output is coupled to a rectifier and the output load, via one core of the transformer. A voltage regulation control circuit includes the other core of the transformer and pulse width modulates the inverter output by controlling the flux variations in the two cores of the transformer. The second core included in the voltage regulation control circuit advantageously permits complete isolation between the input and output circuits of the converter.

Converter station having parallel-connected static converters

Abstract: A converter station for high voltage direct current includes two substantially identical parallel converter branches provided with control systems therefore which limit the control angles of the converters of the branches upwards or downwards. A balancing arrangement is provided to assure equal current distribution between the two converter branches when they are forced so far in one direction that the limit value emitter for the converters of one of the converter branches becomes active. The balancing arrangement includes a device responsive to the difference between the current in the two branches to regulate the control system of the converter of the other branch. This arrangement may include cross connections between the limit value emitters to control converters of both converter branches.

Sequential approximation pulse height analog-to-digital converter

Abstract: A sequential approximation pulse height analog-to-digital converter including a sample and hold circuit. The converter, including the sample and hold circuit, substantially reduces the "dead time" heretofore required to discharge or step down a capacitor retaining a peak voltage value.

Switch-type d.c. to d.c. converter

Abstract: A transistor coupled to a nonsaturating transformer is provided with a capacitive feedback path to form a D.C. to D.C. converter.