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A power parallel current sharing circuit

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

Active Publication Date: 2021-10-26
EATON INTELLIGENT POWER LTD
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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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  • A power parallel current sharing circuit
  • A power parallel current sharing circuit
  • A power parallel current sharing circuit

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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 sharing circuit, comprising a controller for generating a PWM signal; a power parallel circuit composed of parallel power devices, the power parallel circuit includes at least two bridge arms; The filter of the power parallel circuit, the filter includes at least two filter inductors, which are respectively connected to the center of the corresponding bridge arm; wherein, the controller controls the power parallel circuit to generate alternating current and output it to the load through 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. E.g, figure 1 is the topological structure diagram of the power parallel circuit...

Claims

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Application Information

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Patent Type & Authority Patents(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 LTD