Showing papers on "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.

Some design aspects concerning input filters for DC-DC converters

Abstract: Various DC-DC converter input filter requirements as applied in spacecraft power processing equipment, are reviewed with respect to the spacecraft, its power source and filter loads. The conflicting implications arising from the requirements are noted. A filter configuration capable of providing a satisfactory overall compromise is presented. Various design aspects for converter input filters are analyzed. These include minimum weight toroid inductor design, the possibility of non-linear oscillation developing through the interaction of an input filter and a negative impedance regulator and problems in using paralleled capacitors to supply switching regulator loads.

Dual voltage system

Abstract: Two 12-volt batteries are connected in series across the output of a 24-volt charging system, and a DC to DC converter is connected between the output of the charging system and a junction between the batteries. To maintain equal voltages across both batteries, the voltage at the junction is compared with a reference voltage by a voltage regulator that is operatively connected with a DC to DC converter to maintain a regulated output therefrom to the junction.

Dual voltage charging system

Abstract: First and second batteries are connected in series between the terminals of a vehicle starting motor. The DC output terminals of a DC generator are connected across the first battery and also across a voltage sensitive switch and the oscillator transformer input stage of a DC to DC converter. The rectifier output stage of the DC to DC converter is combined with a voltage regulator that is connected across a second battery. The voltage sensitive switch renders the input stage of the converter operative when the output of the the generator is greater than a first predetermined voltage and inoperative below. The voltage regulator maintains a second predetermined voltage across the second battery by rendering the output stage of the converter operative to charge the second battery when the voltage thereon is below the second voltage and inoperative above.

Dual oscillator charger-inverter circuit

Abstract: In a system for supplying power to a load selectively from a rechargeable battery or from an external power source and for recharging the battery from such power source, a dual converter connectable between the battery, the load and the power source and including components forming a first converter for delivering power from the battery to the load and a second converter for converting the energy from the power source into oscillations and applying such oscillations for recharging the battery, the arrangement being composed of switch means for operatively connecting only one converter at a time, a single transformer core, and a plurality of winding wound on the core, with at least one of the winding being common to both converters.

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.

Vehicular transmission pump drives

Abstract: The pump in an automatic transmission is drivingly connected by one-way clutches to be driven by either the transmission converter''s impeller or turbine, whichever is turning faster. The drive connection between the pump and the converter''s turbine is provided by a drive member which extends through the converter''s flow circuit and around the converter''s stator in the converter''s eye to connect to the turbine.

Ignition control device for a converter

Abstract: The invention relates to an ignition control device for a converter having a free swinging oscillating oscillator, whose output voltage permits the regulation of the converter valves at variable ignition angles and in a predetermined sequence. The phase of the oscillator output voltage is controlled in dependence upon a controlled quantity or measurand of the converter such as, for example, the load current. The ignition control device can be used in a "soft power supply system" and is characterized by a good ignition angle symmetry.

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.

High voltage electric network

Abstract: A high voltage electric network has an AC part and a DC part and a converter station connecting the parts. An arrangement is provided for controlling the converter station to maintain a predetermined power exchange between the two parts of the network and to dampen oscillations arising in the AC part. The AC part has two portions as seen from the connection point of the converter station. The converter station is connected to the AC part by an inductive member which has an intermediate output connected to the portion of the AC part of lower impedance while one end of the inductive member is connected to the converter and the other end portion of the AC part.