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A clamp protection circuit and matrix converter

A technology of matrix converter and protection circuit, which is applied in the direction of electrical components, output power conversion devices, etc., to achieve the effect of reducing the cost of diodes, reducing the requirements of withstand voltage value, and reducing costs

Active Publication Date: 2017-04-12
INVT POWER ELECTRONICS SUZHOU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the present invention provides a clamping protection circuit and a matrix converter to solve the problem of needing a diode with a higher withstand voltage value in the prior art

Method used

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  • A clamp protection circuit and matrix converter
  • A clamp protection circuit and matrix converter
  • A clamp protection circuit and matrix converter

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Embodiment Construction

[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0050] The invention provides a clamping protection circuit, which is applied to a matrix converter to solve the problem in the prior art that a diode with a higher withstand voltage value is required.

[0051] Specifically, such as figure 2 , image 3 and Figure 4 As shown, including: parallel clamping capacitor C and energy leakage resistor R X , input side diode unit 201, output side diode unit 202, input side current limiting resistor R r , and the o...

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Abstract

The invention discloses a clamping protection circuit, wherein an output side current limiting resistor is connected between an output end of an output side diode unit and an output end of the clamping protection circuit; when over-high voltage appears on an output side, voltage on two ends of the output side diode unit is only pressure drop of a clamping capacitor, so that the output side diode unit can adopt diodes with low withstand voltage values and low costs; similarly, an input side current limiting resistor is connected between an input end of an input side diode unit and an input end of the clamping protection circuit, so that the input side diode unit can adopt diodes with low withstand voltage values and low costs; if the current limiting resistor is arranged at the input end, the costs of the diodes of the input side can be reduced; if the current limiting resistor is arranged at the output end, the costs of the diodes of the output side can be reduced; if the current limiting resistor is arranged on both two sides, the costs of the diodes on two sides can be reduced simultaneously; and no matter the current limiting resistor is arranged on one side or two sides, the cost of the clamping protection circuit can be reduced.

Description

technical field [0001] The invention relates to the technical field of power conversion, in particular to a clamp protection circuit and a matrix converter. Background technique [0002] The matrix converter is different from the traditional AC-DC-AC converter. It does not have a diode freewheeling channel. Once an abnormal situation occurs, such as the voltage on the input side of the system is too high or the power is lost, or the commutation control is improper. When the load motor is suddenly disconnected, it will directly cause the energy on the system line to be unable to release, resulting in a very high amplitude voltage (V=Ldi / dt, where V is the generated voltage, L is the inductance on the motor line resistance, di is the current change, and dt is the duration of the voltage), it is likely that the switching device will be broken down due to excessive voltage stress. Therefore, a clamping circuit must be used to achieve the purpose of overvoltage protection. [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/32
Inventor 陈高辉
Owner INVT POWER ELECTRONICS SUZHOU CO LTD
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