Integrated high-power chopper and high-frequency switch power supply

Abstract

The invention relates to an integrated high-power chopper, comprising a plurality of high-power choppers mutually connected in parallel. The high-power choppers are of an easily dismounted whole box-type part structure comprising a plurality of high-power IGBT (Insulated Gate Bipolar Transistor) modules, filter capacitors and a cooling device, wherein the grids of the high-power IGBT modules are connected to a PWM (Pulse Width Modulation) control circuit board; the high-power IGBT modules, the cooling device and the filter capacitors are intensively and fixedly arranged in a first box; the PWM control circuit board is arranged in a second box; the first box is provided with a plurality of openings so that the electrode conductors of the collectors of the IGBT modules and the electrode conductors of the filter capacitors can be exposed out of the first box; and the pipeline interface of the cooling device is exposed out of the first box through the openings. The invention also provides a high-frequency switching power supply comprising an uncontrolled rectifier and a filter circuit connected with the uncontrolled rectifier, a plurality of integrated high-power choppers are mutually connected in parallel and / or in series; and the cooling device of the integrated high-power choppers is connected with a cooling medium conveying pipeline.

Description

technical field [0001] The invention relates to a high-power chopper and a high-frequency switching power supply, in particular to an integrated high-power chopper capable of suppressing switching glitches and electromagnetic interference, and a high-frequency switching power supply using the high-power chopper. Background technique [0002] A high-power DC chopper stabilized power supply usually refers to a high-frequency switching power supply with an output power of tens of kilowatts-several megawatts, or even higher power. This high-power DC stabilized power supply can be widely used in induction heating, metallurgy, mining and other fields, and can meet the application requirements for high-power DC motor speed regulation and high-power communication and scientific research fields, such as: megawatt-level long-wave launch and other industrial occasions. Especially in medium and high frequency induction heating, the application of high-power DC regulated power supply is...

AI Technical Summary

Problems solved by technology

[0009] In the process of making the present invention, the inventor found through in-depth research that although figure 1 , figure 2 The circuit shown can be realized in principle, but it is far from enough to be satisfied with the correct electrical connection. The reason for the failure of many chopper power supply development is not the wrong circuit design, but the layout of key power components and the connection process design of the main power circuit. Unreasonable, resulting in excessive switching glitches, electromagnetic interference (Electromagnetic interference: EMI), and electromagnetic compatibility (ElectroMagnetic Compatibility, abbreviation: EMC) cannot meet the requirements

[0010] see Figure 4 , in the prior art, in the manufacture of figure 1 , 2 In the case of the high-power chopper shown, it is generally only based on the general cooling and conductive busbar layout requirements, and the multiple IGBT modules 2, PWM control circuit board 60 and other components are installed in the switching power supply cabinet 80 by means of separate installation. Among them, in order to ensure heat dissipation, the IGBT module 2 is usually arranged on a water-cooled plate (not shown in the figure); in such a layout design, the aforementioned problems such as burrs, EMI, and EMC are not properly considered, and the IGBT module 2 and other power The layout of the components in the switching power supply cabinet 80 is specifically designed, which leads to the distribution parameters of the chopper main circuit becoming worse due to the large stray inductance, and the resulting burrs increase with the increase of the load current, threatening the safety of the IGBT

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