Showing papers on "Buck converter published in 1973"

Two-phase solid state power converter

Abstract: A driven two-phase power converter such as a DC-to-AC inverter or boost converter is modified by the incorporation of a unique differential current transductor and transistor pulse drive circuit. The differential current transductor senses any difference in the average current in the two legs of the twophase power converter circuit and produces a voltage proportional to that current difference. This voltage is then used in the pulse drive circuit to control, on a half-cycle basis, the widths of the drive pulse to the switching transistors in a manner which equalizes the currents in the two legs.

The application of standardized control and interface circuits to three DC to DC power converters

Abstract: Standardized.control and interface circuits were applied to the three most commonly used dc to dc converters: the buck-boost converter, the seriesswitching buck regulator, and the pulse-modulated paral1el inverter. The two-loop ASDTIC regulation control concept was implemented by using a common Analog Control Signal Processor (ACSP) and a novel Digital Control Signal Processor (DCSP). This resulted in control circuit standardization and superior static and dynamic performance of the three dc to dc converters. Power components stress control, through active peak current limiting and recovery of switching losses, was applied to enhance reliability and converter efficiency.

Dynamic behaviour and Z-transform stability analysis of DC/DC regulators with a non linear P.W.M. control loop

Abstract: The local dynamic stability of a PWM buck regulator has been investigated theoretically for the continuous conducting mode and with the aid of an analogue computer simulation for the discontinuous one. A parametric study of the main factors influencing the design and the stability of the control loop has been performed. The discontinuous conducting mode appears to be the most promising.

Arrangement and method for converting electrical power without external supply of reactive power requirements

Abstract: In a system utlizing a naturally commutated converter to convert AC power to DC power (or to convert DC power to AC power), a force commutated converter is placed in parallel with the naturally commutated converter. The input power factor of the force commutated converter is set to compensate for the reactive power required by the naturally commutated converter. The input power factor of the force commutated converter is equal but of opposite sign with respect to the input power factor to the naturally commutated converter, which has an inherently lagging input power factor.

High-efficiency converter and battery charger for an RTG power source

Abstract: Spacecraft power systems utilizing radioisotope thermoelectric generators CRTGs) as primary power sources present an uncommon set of require ments and limitations for interfacing dc-to-dc converters. A converter configuration is presented that complements these RTG characteristics. The circuit is a variation of the basic flyback regulator modified to provide input regulation. The converter has two isolated outputs. One output provides power directly to the spacecraft equipment, while the second is used for battery charging. Design problems addressed are noise generation in long cable lengths between the RTG source and the converter, regulation of the converter input to obtain maximum power transfer from the RTG to the equipment, and provision for two converter outputs while maintaining high efficiency with a simple design implementation. The design of a converter and battery charger used on the Viking Lander Capsule* is presented as an illustration.