Showing papers on "Buck converter published in 1977"
14 Jun 1977
TL;DR: In this paper, a new energy transfer system is evaluated for application in a 130 watt, l800 volt dc-to-dc converter, where the single-ended half-wave transformer-coupled converter provides high efficiency with a low component count in the power train, resulting in a 25% cost reduction relative to a push-pull pulsewidth controlled converter.
Abstract: A new energy transfer system is evaluated for application in a 130 watt, l800 volt dc to dc converter. The single-ended half-wave transformer-coupled converter provides high efficiency (82%) with a low component count in the power train, resulting in a 25% cost reduction relative to a push-pull pulse-width controlled converter.
109 citations
Patent•
07 Mar 1977TL;DR: In this paper, the switching device of a single-ended converter is modulated to regulate the input impedance and hence the input voltage of the converter to permit its efficient operation at varying cable lengths.
Abstract: A converter designed to be powered by a constant current and variable voltage source such as a coaxial cable of variable length includes regulation circuitry to regulate the input voltage of the converter. In particular, the switching device of a single-ended converter is pulse width modulated to regulate the input impedance and hence the input voltage of the converter to permit its efficient operation at varying cable lengths.
16 citations
Patent•
31 Aug 1977TL;DR: In this article, a power converter control system for use with a power converter of the type which comprises a plurality of cascade-connected converter units of which at least one converter unit is subjected to continuous control of its conduction phase angle and the remaining converter units are subjected to on-off control of their conductivity is arranged to include a master controller for instructing the number of the converter units to be rendered operative.
Abstract: A power converter control system for use with a power converter of the type which comprises a plurality of cascade-connected converter units of which at least one converter unit is subjected to continuous control of its conduction phase angle and the remaining converter units are subjected to on-off control of their conductivity is arranged to include a master controller for instructing the number of the converter units to be rendered operative, a reversible counter operative to change its content in response to a phase controlling command applied to the continuously controlled converter unit indicating a maximum or minimum conduction phase angle or delayed phase angle in conduction, a unit change control unit for producing unit changing operation signals to be applied to the respective converter units for controlling the operation of the same, by using one of the binary bits derived from the counter without modification and decoding the remaining bits, and a comparing and identifying circuit which compares the content of the reversible counter with the output of the master controller and causing the reversible counter to operate in response to the aforementioned phase control command until the content of the same becomes identical to the output of the master controller.
10 citations
TL;DR: In this article, the buck converter is used to prevent an overload on an electronic switch in ON-state by detecting the voltage which is on its main current electrodes and turning this switch to its OFF-state for a certain period of time as soon as a certain limit has been reached.
9 citations
Patent•
18 Mar 1977TL;DR: In this article, a power and phase converter is adapted to utilize the single-phase and direct current power outputs of a conventional aircraft power supply, converting such outputs into stable three-phase power on wye-connected, grounded neutral distribution lines.
Abstract: A compact power and phase converter is adapted to utilize the single-phase and direct current power outputs of a conventional aircraft power supply, converting such outputs into stable three-phase power on wye-connected, grounded neutral distribution lines. An automatic current limiter provides overload protection for the converter when excessive output current is demanded.
8 citations
Patent•
18 Mar 1977TL;DR: In this article, a power and phase converter is adapted to utilize the single-phase and direct current power outputs of a conventional aircraft power supply, converting such outputs into stable three-phase power on wye-connected, grounded neutral distribution lines.
Abstract: A compact power and phase converter is adapted to utilize the single-phase and direct current power outputs of a conventional aircraft power supply, converting such outputs into stable three-phase power on wye-connected, grounded neutral distribution lines. An automatic current limiter provides overload protection for the converter when excessive output current is demanded.
6 citations
TL;DR: In this article, a generalized computer-aided modeling and analysis of DC-DC converters is presented, which is applicable to all types of power stages and duty-cycle control, including continuous and discontinuous inductor current operation.
5 citations
TL;DR: In this paper, the authors proposed a speed control of a slip-ring motor with a line-side converter and a slip ring side converter, where the converter at the slip ring is able to function as an inverter.
3 citations
Patent•
16 Aug 1977
TL;DR: In this article, a transistor, a transformer and a ferromagnetic core are used to produce a voltage for an electrical load different in magnitude from the voltage of an electrical energy source from which the converter takes power.
Abstract: The converter includes a transistor, a transformer having a ferromagnetic core, tuning capacity, and rectification of high frequency oscillations which occur in the converter for producing a voltage for an electrical load different in magnitude from the voltage of an electrical energy source from which the converter takes power. Load voltage and electrical energy source voltage may be direct current voltages or changing voltages. The converter operates to maintain the voltage across the load at a constant value independent of the resistance of the electrical load. The oscillations occur only when transistor bias current is provided, for example by bias current conduction through the load, in which case negligible power is taken from the electrical energy source by the converter when the load is disconnected. High frequency of oscillations in the converter provides certain advantages.
Patent•
22 Jul 1977
TL;DR: In this article, a parametric upper sideband down converter for receiving an input signal whose frequency is not much different from the intermediate frequency produced at the output of the down converter is described.
Abstract: A microwave input circuit including a parametric upper sideband down converter for receiving an input signal whose frequency is not much different from the intermediate frequency produced at the output of the down converter. The down converter may be either of the series type or of the parallel type and has its signal input directly connected to a microwave antenna and terminated by the real antenna resistance (Rg) or the real antenna conductance (Gg), respectively, at the input signal frequency (fs1). The parametric down converter comprises a cascade connection of a parametric down converter stage and a parametric up converter stage with both of said stages being of the series type or of the parallel type. The down converter stage is terminated at its image frequency (fsp) with a real resistance (Rsp) or a real conductance (Gsp), respectively, and satisfies the following relationship for a series type down converter: ##EQU1## WHERE Rs1 is the series resistance of the reactance diode in the down converter stage, or the following relationship for a parallel type down converter: ##EQU2## where GD1 is the conductance loss of the reactance diode in the down converter stage, due to Rs1.