High-power adjustable direct-current power supply device

Abstract

The invention discloses an adjustable direct-current power supply device. A primary winding of a rectifier transformer adopts a five-stage tap, and the secondary output voltage, namely the input voltage of a rectifier, reaches 10-stage no-load voltage regulation by connecting the primary winding into a delta connection method or a star connection method. The secondary side is provided with two windings which are in triangular connection and star connection (the phase difference is 30 degrees) respectively, and the two windings are output to a rectifier in two ways. The rectifier is composed of two sets of 6-pulse rectifier bridges, the rectifier has two working modes of series connection and parallel connection by changing the connection mode of the output ends of the rectifier, and direct current (DC) 0-1000V power output can be achieved by combining 10-stage voltage regulation of the rectifier transformer. The direct-current power supply has multiple voltage regulation modes, can output a wide-range rated voltage of DC 0-1000V, and provides a stable and reliable power supply for multiple direct-current motors and direct-current power electronic equipment; and the input and output voltage adjusting precision is high, the power factor of the power input side of the power supply device can be greatly improved, and the ripple coefficient of the output voltage is reduced.

Description

technical field [0001] The invention belongs to the technical field of power supplies, in particular to the technical field of a high-power industrial-frequency rectifying power supply, in particular to a high-power adjustable DC power supply. Background technique [0002] With the rapid development of power electronic technology, power electronic equipment has been integrated into people's work and life, and all electronic equipment must have a reliable power supply system. In the medium-voltage and high-power field, the power frequency rectifier power supply has the advantages of strong adaptability to the power supply environment, strong impact load resistance, and high reliability, and is widely used in various fields. [0003] At present, the practical use of medium-voltage high-power power frequency rectification power supply basically adopts the following three methods: 1. Using diode rectification, the output voltage is uncontrollable, the input current has large har...

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Problems solved by technology

[0003] At present, the practical use of medium-voltage high-power power frequency rectification power supply basically adopts the following three methods: 1. Using diode rectification, the output voltage is uncontrollable, the input current has large harmonics, and the power factor is low; 2. Using IGBT pulse width modulation, although The output voltage is controllable and the power factor is improved, but the equipment cost is high, the reliability is low, and the control loop is complicated; 3. The thyristor phase-shift control is adopted, although the output voltage is controllable, but with the phase shift The power factor will become worse and worse as the pulse moves backward

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