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IGBT buffer circuit, PFC circuit and air conditioner control system

A buffer circuit and circuit technology, applied in high-efficiency power electronic conversion, electrical components, electronic switches, etc., can solve problems such as malfunctions

Inactive Publication Date: 2014-09-10
GD MIDEA HEATING & VENTILATING EQUIP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide an IGBT snubber circuit, aiming to solve the problem of the high surge voltage and current generated on the IGBT when using the power device IGBT and avoiding system malfunction caused by excessive peak current

Method used

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  • IGBT buffer circuit, PFC circuit and air conditioner control system
  • IGBT buffer circuit, PFC circuit and air conditioner control system
  • IGBT buffer circuit, PFC circuit and air conditioner control system

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Embodiment Construction

[0025] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0026] The present invention provides a kind of IGBT snubber circuit, refer to image 3 and Figure 4 , in one embodiment, the IGBT snubber circuit 10 is connected between the IGBT20 and the load 30, and includes a clamp unit 11, a snubber unit 12 and a voltage limiting unit 13, wherein,

[0027] The clamping unit 11 is connected between the collector of the IGBT20 and the buffer unit 12, and is used to clamp the transient voltage of the IGBT20 when the IGBT20 is in the on state, preventing the buffer unit 12 from The stored electrical energy passes through the IGBT20.

[0028] refer to Figure 4 , in this embodiment, the clamping unit 11 is a fast recovery diode D1, the buffer unit 12 is a buffer capacitor C1, and the fast recovery diode D1 clamps the transient voltage of the IGBT20 to prevent the electric energy ...

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Abstract

The invention discloses an IGBT buffer circuit. The IGBT buffer circuit includes a clamp unit, a buffer unit and a voltage limiting unit; the clamp unit is connected between the collector of an IGBT and the buffer unit and is used for clamping the transient voltage of the IGBT when the IGBT is in a switched-on state, and preventing electric energy stored by the buffer unit from passing through the IGBT; and the voltage limiting unit is connected between the buffer unit and a load and is used for providing a discharge path to the load for the buffer unit when the IGBT is in a switched-off transient state, and voltage between the collector and the emitter of the IGBT charges the buffer unit through the clamp unit, and limiting the generation of voltage peak in a charging period. The invention further provides a PFC circuit and an air conditioner control system. The IGBT buffer circuit, the PFC circuit and the air conditioner control system of the invention are advantageous in that the IGBT buffer circuit, the PFC circuit and the air conditioner control system can reduce switching loss and protect the IGBT.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to an IGBT buffer circuit, a PFC circuit and an air-conditioning control system. Background technique [0002] IGBT (Insulated Gate Bipolar Transistor, Insulated Gate Bipolar Transistor) is a composite fully controlled type composed of BJT (Bipolar Junction Transistor, bipolar transistor) and MOS (metal-oxide-semiconductor, insulated gate field effect transistor) Voltage-driven power semiconductor devices, which combine the high input impedance of MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor, Metal-Oxide Semiconductor Field-Effect Transistor) and the low conduction voltage drop of GTR (GiantTransistor, power transistor) Advantages, small driving power and low saturation voltage, are widely used in variable current systems such as AC motors, frequency converters, switching power supplies, lighting circuits, traction drives and other fields. [0003] In power electronic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/42H02M1/34H03K17/081
CPCY02B70/126Y02B70/10
Inventor 李忠慧小仓健
Owner GD MIDEA HEATING & VENTILATING EQUIP CO LTD
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