High power factor soft switching three-phase induction coil synthetic heating power supply

A high power factor, induction coil technology, applied in the direction of high-efficiency power electronic conversion, output power conversion device, AC power input conversion to AC power output, etc., to achieve the effect of improving input power factor and improving efficiency

Active Publication Date: 2012-02-01
无锡市沃乐思科技有限公司
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  • Claims
  • Application Information

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Problems solved by technology

However, high-power power supplies generally use three-phase three-wire input, so there are many problems in improving the power factor.
In addition, the large capacity of the induction heating power supply is currently e

Method used

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  • High power factor soft switching three-phase induction coil synthetic heating power supply
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  • High power factor soft switching three-phase induction coil synthetic heating power supply

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with drawings and embodiments.

[0027] The invention relates to three independent line voltage inputs, three single-phase rectification and full-bridge synchronous inverter controls, three-phase induction coil synthesis, high power factor soft switching and high-efficiency induction heating power supply.

[0028]The three groups of single-phase conversion circuits refer to AB phase conversion circuits, BC phase conversion circuits, and CA phase conversion circuits; each group of single-phase conversion circuits includes single-phase full-bridge diode rectifier circuits connected to corresponding single-phase line voltages respectively, A single-phase high-frequency inverter circuit connected to a single-phase full-bridge diode rectifier circuit, a DC blocking capacitor connected to a single-phase high-frequency inverter circuit, a high-frequency transformer connected to a DC blocking capacitor, and a s...

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Abstract

The invention provides a high power factor soft switching three-phase induction coil synthetic heating power supply, three groups of single-phase conversion circuits are adopted, each single-phase conversion circuit adopts a single-phase line for voltage input and adopts a single-phase line voltage diode for rectification respectively, a capacitor is not added for filtering, high-frequency alternating current pulse voltage which can enable output envelope lines to be sine waves and adjust the pulse width is formed by conversion through an inverter circuit, the high-frequency alternating current pulse voltage is inputted into three induction coils which are independent mutually and wound in parallel through resonant load matching of three groups of high-frequency transformers to form synthetic magnetic flux, and eddy current is generated in a workpiece which is heated for heating. Inverter bridges adopt the phase shift power control soft switching technology. Sine wave current outputted by the three single-phase inverter bridges are sampled and converted to alternating current voltage signals, the series connection is adopted for connecting the same frequency and the same phase for addition, square wave signals are formed through a zero-crossing comparison circuit, output pulses can track input square waves through a phase-locked loop circuit, three inverter bridge switching tubes are controlled through a power amplification circuit, a pulse distribution circuit and a driving circuit, and the phase-locked frequency tracking synchronization control is realized.

Description

technical field [0001] The invention relates to a heating power supply, in particular to a high power factor soft-switching three-phase induction coil synthesis heating power supply. Background technique [0002] With the development of modern induction heating technology, the application of induction heating in industry is becoming more and more extensive. In some industrial fields such as welding and quenching, the power requirements for induction heating power supplies are getting higher and higher. Coupled with the development of new power electronic devices and the continuous maturity of capacity expansion technology, large capacity and improved power factor have become the development trend of induction heating power supplies. inevitable trend. [0003] At present, the induction heating power supply adopts AC-DC-AC conversion technology. The first step of power input from the power grid is AC-DC conversion, that is, rectification. Rectification includes diode rectifi...

Claims

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Application Information

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IPC IPC(8): H02M5/458H02M5/10H02M1/42
CPCY02B70/126Y02B70/1491Y02B70/10
Inventor 沈锦飞赵慧
Owner 无锡市沃乐思科技有限公司
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