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IPM output short-circuit protection method

A technology for output short-circuit and short-circuit detection, which is applied to emergency protection circuit devices, electrical components, control systems, etc., can solve problems such as inability to perform short-circuit protection in time, improve detection reliability, reduce heat generation, and reduce thermal shock Effect

Pending Publication Date: 2020-03-31
四川长虹空调有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method for IPM output short-circuit protection to solve the problem that conventional IPM over-current protection can only deal with ordinary over-current protection and cannot perform short-circuit protection in time

Method used

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Embodiment Construction

[0017] The present invention will be further described in detail below in conjunction with the embodiments and accompanying drawings.

[0018] Such as figure 2 As shown, the IPM output short circuit protection method of the present invention is through the following steps:

[0019] Step 1: Power on the system and initialize the MCU.

[0020] In this step, the MCU completes chip hardware initialization, detection and initialization of peripheral sensors, PFC control parameter initialization, and IPM control parameter initialization, and sets the I / O port connected to the IPM FO pin of the MCU to a falling edge trigger interrupt input mode, So that when the IPM outputs a fault signal, the MCU can process it at the first time.

[0021] Step 2: Before the PFC is turned on and the motor is not started, the MCU sends a short-circuit detection pulse to the IPM. The pulse width is slightly longer than the internal drive delay time tscp of the IPM, so that the IPM energizes each pha...

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Abstract

The invention relates to the field of IPM protection, discloses an IPM output short-circuit protection method, and is used for solving the problem that conventional IPM overcurrent protection can onlycope with common overcurrent protection and cannot perform short-circuit protection in time. According to the invention, the system initializes the motor before starting; the MCU sends a short circuit detection pulse to the IPM; and the MCU detects the state of an IPM fault output pin, if it is detected that the IPM fault output pin is in a fault state, the system stops starting, the MCU displaysa fault code on the display device, if it is detected that the IPM fault output pin is in a normal state, the system normally starts the motor. The IPM short-circuit protection circuit is suitable for IPM output short-circuit protection, the IPM short-circuit protection performance can be improved, the system reliability is improved, the circuit design difficulty is reduced, and the cost does notneed to be increased.

Description

technical field [0001] The invention relates to the protection field of IPM (that is, an intelligent power module), in particular to an IPM output short-circuit protection method. Background technique [0002] In addition to the integrated power device (IGBT), the IPM also integrates rich monitoring and protection functions, which greatly facilitates the application and improves the system reliability. The IPM protection circuit can realize control voltage undervoltage protection, overheat protection, overcurrent protection and short circuit protection. Turn off the IGBT output at the specified time, and output the fault signal to the MCU. [0003] figure 1 It is a typical circuit for IPM overcurrent protection, where RS is a current sampling resistor, connected between the output terminal (LS) of the lower bridge arm of the IPM and the ground, the current flowing through RS is the IPM output current, and the voltage at the high potential terminal of RS is proportional to ...

Claims

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Application Information

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IPC IPC(8): H02H7/085H02P1/02
CPCH02H7/0854H02P1/022
Inventor 李越峰赵静林志强
Owner 四川长虹空调有限公司
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