High-power-factor soft-switching three-phase power-regulating power supply

Abstract

The invention relates to a high-power-factor soft-switching three-phase power-regulating power supply which comprises an AB-phase high-frequency filter circuit. The AB-phase high-frequency filter circuit is connected with an AB-phase high-frequency rectifier circuit via an AB-phase rectifier circuit, an AB-phase inverter circuit and an AB-phase resonance circuit; a BC-phase high-frequency filter circuit is connected with a BC-phase high-frequency rectifier circuit via a BC-phase rectifier circuit, a BC-phase inverter circuit and a BC-phase resonance circuit; a CA-phase high-frequency filter circuit is connected with a CA-phase high-frequency rectifier circuit via a CA-phase rectifier circuit, a CA-phase inverter circuit and a CA-phase resonance circuit; a control circuit is connected with the output end of an output voltage and current detection circuit, an inverter current detection circuit and a power setting signal; and the control circuit is connected with the control ends of the AB-phase inverter circuit, the BC-phase inverter circuit and the CA-phase inverter circuit via the output end of a drive circuit. The high-power-factor soft-switching three-phase power-regulating power supply has high power factor, an inverter bridge adopts the load resonant moving power control soft-switching technology, so that the switching loss is reduced, the overall efficiency is increased, and the power supply is safe and reliable.

Description

technical field [0001] The invention relates to a three-phase power regulating power supply, in particular to a high power factor soft-switching three-phase power regulating power supply, belonging to the technical field of power regulating power supplies. Background technique [0002] The traditional three-phase power adjustment power supply, also known as the thyristor power regulator, is mainly used for various electric heating devices (such as electric heating industrial furnaces, electric heating dryers, electric heating oil furnaces, various reaction tanks, electric heating devices for reaction kettles) The heating power is adjusted to control the heating temperature. [0003] Three-phase power regulators are widely used in the following fields: [0004] A. Electric furnace industry: annealing furnace, drying furnace, quenching furnace, sintering furnace, crucible furnace, tunnel furnace, melting furnace, box type electric furnace, pit type electric furnace, melting e...

AI Technical Summary

Problems solved by technology

[0011] The traditional three-phase power supply mainly has the following problems: low power factor; high output low-order harmonic content, low power utilization efficiency; serious grid harmonic current pollution, slow dynamic response speed, unable to cope with sudden load changes situation, the electric heating load has inductance and reactive power loss

[0012] The full-control inverter and voltage-regulated power supply can solve the problem of harmonic pollution very well, but most of the switching tubes work in the hard switching state, which requires relatively high switching devices, increases costs, and more importantly, increases switching losses and reduces Power supply efficiency, especially when the power increases, the defects in this aspect are more obvious, which limits the development of high frequency power supply

In addition, due to the existence of power electronic devices and nonlinear components, a large number of current harmonics are generated during the operation of the power supply, resulting in a decrease in the input power factor of the power supply and causing serious pollution to the grid environment.

For the power regulation power supply with low voltage output, power frequency transformer is needed to step down the voltage. The power frequency transformer is large in size and high in cost, which is not suitable for the current development trend of high power factor, high efficiency and miniaturization of voltage regulators.

Images