Multiple Output Power Supplies Research Articles

Novel Time Division Multiple Control Method for Multiple Output Battery Charger

Multiple output converters (MOCs) are widely used in electronic equipment for industrial, commercial, and military application such as the voltage regulator modules in portable electronic devices, multiple output power supplies, and multiple output charger due to their advantages in cost, volume, and efficiency. However, most of the MOCs developed so far have limitations in terms of the number of outputs, the tight regulation of all the outputs, the simplicity of the structure, and the ease of control. In this letter, a novel time division multiple control (TDMC) method which can regulate all of the outputs with high precision is proposed. The proposed method is simple in its control and structure. In addition, it provides an even degree of tight regulation for all the outputs. The validity and the feasibility of the proposed method are verified by applying it to a multiple output battery charger based on the double ended forward converter.

State-Plane Analysis of Regenerative Snubber for Flyback Converters

The flyback converter is a popular topology for implementing low power and multiple output power supplies. However, the high leakage inductance of the flyback transformer causes high voltage spikes that can damage the main transistor when the switch is turned OFF. Therefore, a turn-off snubber is needed to limit the peak voltage stress. This paper presents the analysis of an energy regenerative snubber using the graphical state-plane technique. The undertaken approach yields a clear-cut design procedure for minimum switch voltage stress. Experimental evaluation of the energy regenerative snubber in comparison with other common snubbers shows that under the same voltage stress the efficiency of energy regenerative snubber has 8% improvement on average over an RCD snubber and 2% improvement over the nondissipative LC snubber.

Design of Radar Level Measurement Instrument Based on the UC3844

Introduced the internal function of UC3844, and analyzed the working important point of switching power supply. Planning and design of the radar level measurement instrument of multiple output power supply circuit.

Design and Implementation of Multiple-Output Power Supply for Electric Vehicle

The drive circuit of an electric vehicle requires a lot of different isolation voltage. In this paper, a multi-output power supply is designed to supply the drive circuit of an electric vehicle. The power supply system uses a flyback converter to achieve the isolated multi-output sources that contain fourteen sets of output voltage. In order to reduce noise interference, six sets of isolated sources are provided to drive insulated gate bipolar transistor (IGBT). Five sets of isolated sources are supplied for 485 cards, speed detector, and controller circuit of the flyback power supply. Three sets of common ground sources are supplied for status interface, the center processing unit, and the operation amplifier. In addition, a discontinuous conduction mode (DCM) small-signal model, with a peak current mode control, is built, and the feedback controller is designed for stabilizing the desired power supply. Finally, a 20W multiple-output power supply is built to provide the drive sources of the electric vehicle.

A single-switch flyback-current-fed DC-DC converter

This work presents a novel DC-DC converter, whose significant advantages are the single power switch, single-input inductor, purely capacitive output filter, isolation, low current ripple through the output capacitor, and operation at constant frequency in a conventional pulse-width-modulation scheme. The new converter operates over a wide input-voltage range and can be employed in power factor correction and multiple-output power supplies. Theoretical analysis is presented along with experimental results taken from a laboratory prototype rated at 300 W/50 kHz.

Constant frequency PWM capacitor voltage-clamped series resonant power supply

The authors propose a capacitor-voltage-clamped series-resonant converter, regulated at constant frequency by pulse-width modulation (PWM), that is suitable for an offline isolated multiple output power supply. The principle of operation, theoretical analysis, simulation, design procedure, and design example are provided, along with experimental results. The validity of the theoretical analysis and the main properties of the proposed converter were demonstrated in the laboratory, with the design and construction of an isolated power supply rated at 12 V/16 A and operating at 100 kHz. The proposed technique significantly reduces the RMS value of the current through the transistors, reduces the size of the output filter capacitor, and improves dynamic response. >

Class E low dv/dt synchronous rectifier with controlled duty ratio and output voltage

A class-E high-frequency low-dv/dt synchronous rectifier/DC regulator is analyzed. The circuit is derived from a class-E rectifier by replacing a diode with a controllable switch. It can then both rectify and regulate the rectified output against variations in DC load and amplitude of the AC input voltage. The switch consists of a transistor and an antiparallel diode or a series diode. The DC output voltage of the rectifier is regulated by varying the ON duty ratio of the switch. The AC input voltage can be at a constant or varying frequency. The controllable switch turns on and off at zero voltage with low dv/dt, reducing switching losses, stresses, and noise. Equations governing the circuit operation are derived. Experimental results at 0.5 MHz were in good agreement with the theoretical predictions. The rectifier can be used in high-frequency-power-density multiple-output power supplies, all of whose outputs are regulated. The frequency need not be varied to regulate the DC output.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

A new multiple-output hybrid power supply

A novel hybrid power supply to perform the precise regulation of multiple-output voltages is presented. It is composed of an improved forward-type multiple-output converter as a preregulator and continuous series regulators using MOSFETs as voltage droppers. The steady-state and the dynamic cross-regulation characteristics are analyzed and compared both theoretically and experimentally for the conventional and improved forward-type multiple-output converters. As a result, it is clearly demonstrated that the improved forward-type multiple-output is superior to its conventional counterpart in terms of steady-state and dynamic cross-regulation characteristics, and that the proposed multiple-output power supply has sufficiently precise multiple-output voltage regulation and a satisfactorily high power efficiency. >

Interdata now makes own power supplies

OCEANPORT, N. J., JANUARY 24, 1974 -- Interdata, Inc., leading minicomputer manufacturer, announced today it bad begun the manufacture of its own 25 and 50-amp multiple output power supplies.