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A kind of parallel MOS tube current sharing and short circuit protection circuit

A short-circuit protection circuit and MOS tube technology, applied in the field of electronic circuits and power electronics, can solve the problems of rarely adding MOS tube short-circuit protection function, the protection state of the MOS tube being unable to work, the MOS tube being unable to work, etc. Flow characteristics and protection characteristics, prevention of false protection, and effect of increasing speed

Active Publication Date: 2019-06-18
BEIJING RES INST OF PRECISE MECHATRONICS CONTROLS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the MOS tubes are used in parallel, the problem of current sharing has not been effectively solved, which may damage the MOS tubes due to uneven current; at the same time, when the MOS tubes are used, the short-circuit protection function for the MOS tubes is rarely added Without the protection circuit of the MOS tube, the misjudgment of the protection state or the untimely response will not play a big role in the MOS tube, which will lead to the direct connection and damage of multiple parallel-connected MOS tubes, which greatly improves the research and development. cost
[0003] When the current technology is used in parallel with MOS tubes, the problem of current sharing has not been effectively solved, so that the MOS tube may be damaged due to uneven current; at the same time, when the MOS tube is used, the short-circuit protection function for the MOS tube is rarely added. Even if the protection circuit of the MOS tube is added, the misjudgment of the protection state or the untimely response will not have a great effect on the MOS tube, which will lead to the direct connection and damage of multiple parallel-connected MOS tubes, which greatly improves the performance of the MOS tube. research and development costs

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  • A kind of parallel MOS tube current sharing and short circuit protection circuit

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Embodiment Construction

[0025] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0026] The invention provides a parallel MOS tube current equalization and short circuit protection circuit, which can make the current flowing through each MOS tube equal to the switching speed in the use circuit of MOS tubes in parallel, and when the MOS tubes are short-circuited, use triple The protection method can quickly and effectively detect the current operating state of the MOS, thereby protecting the MOS tube and making the MOS tube damaged as little as possible. This circuit is simple and reliable to build, and occupies a small area of ​​the PCB board, especially suitable for use in occasions that require high PCB size and high protection requirements.

[0027] Such as figure 1 Shown is a schematic diagram of a parallel MOS tube current sharing and short circuit protection circuit. It can be seen from the figure that a parallel MOS ...

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Abstract

The invention discloses a parallel MOS transistor current sharing and short circuit protection circuit, and relates to the technical fields of electronic circuits and power electronics. The parallel MOS transistor current sharing and short circuit protection circuit comprises a switching value monitoring circuit, an analog quantity monitoring circuit, a fast monitoring circuit, an MOS transistor parallel current sharing circuit, a driving circuit and a main control circuit, wherein one end of the switching value monitoring circuit is connected with the main control circuit; the other end of the switching value monitoring circuit is connected with the main control circuit and one end of the analog quantity monitoring circuit; the other end of the analog quantity monitoring circuit is connected with the fast monitoring circuit; the fast monitoring circuit is connected with the main control circuit and one end of the MOS transistor parallel current sharing circuit; and the MOS transistor parallel current sharing circuit is connected with the driving circuit and external bus voltage. The parallel MOS transistor current sharing and short circuit protection circuit realizes that each MOS transistor is equal in flowing current and switching speed, and can detect the current operating state of each MOS transistor quickly and effectively; and the parallel MOS transistor current sharing and short circuit protection circuit is simple and reliable in circuit construction and small in PCB occupation area.

Description

technical field [0001] The invention relates to the technical field of electronic circuits and the field of power electronics, in particular to a parallel MOS tube current equalization and short circuit protection circuit. Background technique [0002] The MOS tube is a Metal Oxide Semiconductor Field Effect Transistor (Metal Oxide Semiconductor FieldEffect Transistor). With the development of electronic power technology, power MOSFET has been more and more widely used for its good high-frequency performance, small switching loss, high input impedance, low driving power, and simple driving circuit. In many applications with low voltage and high power, such as electric tricycles, small electric forklifts, etc., in order to meet the current requirements, the method of parallel connection of MOS tubes is adopted without exception. However, when the MOS tubes are used in parallel, the problem of current sharing has not been effectively solved, which may damage the MOS tubes due...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/088H03K17/08
CPCH02M1/088H03K17/08
Inventor 李鹏飞陈靓郑继贵邓烨黄玉平
Owner BEIJING RES INST OF PRECISE MECHATRONICS CONTROLS
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