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A light intermediate frequency heating power supply and design method based on high frequency rectification and inverter

A high-frequency rectification and heating power supply technology, which can be used in conversion equipment that can be converted into DC without intermediate conversion, induction heating, high-efficiency power electronic conversion, etc. , large volume and other problems, to achieve the effect of improving induction heating efficiency, reducing volume and weight, and reducing manufacturing costs

Active Publication Date: 2018-11-30
XIAN PENGRUI PETROLEUM TECH
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  • Description
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Problems solved by technology

Due to the non-soft switching technology and the use of intermediate frequency transformers, the manufacturing cost is high, the volume is large, and the weight is heavy, which brings inconvenience to transportation, on-site installation, operation and maintenance

Method used

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  • A light intermediate frequency heating power supply and design method based on high frequency rectification and inverter
  • A light intermediate frequency heating power supply and design method based on high frequency rectification and inverter
  • A light intermediate frequency heating power supply and design method based on high frequency rectification and inverter

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Embodiment Construction

[0025] see figure 1 As shown, the present invention is a light-duty medium-frequency heating power supply based on high-frequency rectification and inverter, including a high-frequency rectification and inverter circuit, a high-frequency step-up transformer, an intermediate-frequency chopper circuit and a load circuit.

[0026] 1. High-frequency rectification and inverter circuit design

[0027] The design principle of high-frequency rectification and inverter circuit is as follows: figure 2 As shown, the high-frequency rectification and inverter circuit includes a three-phase full-wave rectification circuit and an IGBT inverter circuit. In the three-phase full-wave rectification circuit, the diode performs full-wave rectification on the three-phase 50Hz / 380V sinusoidal AC voltage, and then outputs a 20KHz high-frequency square wave voltage U through the IGBT inverter circuit. ab ,Such as image 3 (a) shown. at U ab The output circuit is connected to a high-frequency ste...

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Abstract

The invention discloses a light intermediate frequency heating power supply based on high-frequency rectification and inverter and a design method thereof. Through the high-frequency IGBT rectification and inverter circuit, and using soft switching technology, the three-phase power frequency AC voltage signal is converted into a high frequency of 20KHz. Square wave voltage output; on the output side of the IGBT rectifier inverter circuit, an external high-frequency step-up transformer is connected, in which the primary winding of the high-frequency step-up transformer is an inductive load, and a capacitor is connected in series to make the output circuit of the secondary winding of the transformer resonate at 20KHz; as a high-frequency AC The power supply, through a group of IGBT switch modules, realizes medium-frequency chopping of the input high-frequency high voltage. 1KHz series resonance occurs in the capacitor, at this time, the intermediate frequency sinusoidal AC current flows through the load to meet the demand of the load heating current. The invention not only greatly reduces manufacturing and application costs, but also uses simple modules and is easy to implement.

Description

technical field [0001] The invention belongs to the technical field of heating power supply, in particular to a light intermediate frequency heating power supply based on high-frequency rectification and inverter and its design method, which can be widely used in petrochemical industry, smelting, forging, crystal growth, precision casting, heat treatment, welding, bending, etc. Tube and other medium frequency electric heating field. Background technique [0002] With the rapid development of my country's industrialization process, the field of induction heating is also developing rapidly. Due to environmental protection requirements and rising coal prices, heating with coking coal not only does not meet environmental protection requirements, but is also very uneconomical in terms of price and economy. On the other hand, industrial heating also widely uses KGBS intermediate frequency heating equipment with thyristor as the main device, which has a low power factor and consum...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/458H02M5/16H05B6/02
CPCH02M5/16H02M5/458H05B6/02H02M1/0058Y02B70/10
Inventor 刘沛津韩行彭莉峻何林杨婷
Owner XIAN PENGRUI PETROLEUM TECH
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