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Power-parallel current-equalizing circuit

A circuit and parallel technology, which is applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc., can solve the problems of asymmetrical circuit topology layout, inconsistent parameters, unbalanced current distribution, etc., to achieve Solve the problem of inconsistency in parallel connection, and the effect of current sharing is good

Active Publication Date: 2018-11-16
EATON INTELLIGENT POWER LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the inconsistency of the parameters of IGBT and other devices or the asymmetric layout of the circuit topology, it usually leads to unbalanced current distribution, and even causes the device to fail because the current exceeds the specification.

Method used

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Embodiment Construction

[0020] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0021] Factors that affect the uneven current distribution of parallel power devices generally include the quiescent current imbalance caused by the parameters of the device itself, for example, the saturation voltage drop of the IGBT and the positive current of the anti-parallel diode affected by the parameters of the IGBT and its anti-parallel diode. voltage drop, or the gate drive voltage of the IGBT affected by device parameters in the IGBT drive circuit; in addition, there are dynamic current imbalances caused by asynchronous device switching, such as transconductance and anti-para...

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Abstract

The invention relates to a power-parallel current-equalizing circuit comprising a controller for generating a PWM signal; a power parallel circuit formed by a parallel power device and comprising at least two bridge arms; and a filter connected with the power parallel circuit and comprising at least two filter inductors connected to the centers of the corresponding bridge arms respectively; wherein the controller controls the power parallel circuit to generate an alternating current which is output to a load via the filter.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a power parallel current sharing circuit. Background technique [0002] With the increasing number of megawatt-level power devices in the field of power electronics, the requirements for power switches are also getting higher and higher. IGBT (Insulated Gate Bipolar Transistor), an insulated gate-bipolar transistor, is a composite fully-controlled voltage-driven power semiconductor device composed of a bipolar transistor (BJT) and an insulated gate field effect transistor (MOSFET). Because of its high input impedance and low conduction voltage drop, it is especially suitable for high-power application scenarios. [0003] When using IGBT, if a single device cannot meet the power demand, power parallel connection is usually used to improve the withstand voltage and current withstand level. For example, figure 1 is the topological structure diagram of the power parallel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02M7/5395
CPCH02M7/53871H02M7/5395H02M1/0067Y02E40/50
Inventor 郑大为刘丹徐忠勇
Owner EATON INTELLIGENT POWER LIMITED