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An overcurrent protection method, device, chip and control circuit

A technology for controlling circuits and protecting circuits, which is applied in the electronic field and can solve the problems of IPM shock and failure to trigger the IPM overcurrent protection function.

Active Publication Date: 2019-08-09
HISENSE (SHANDONG) AIR CONDITIONING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above-mentioned prior art, the inventors of the present invention have found that, in the above scheme, when there is an overcurrent on the output circuit of the IPM, but the duration of the overcurrent is short, the overcurrent protection function of the IPM cannot be triggered, and the IPM will still under the impact of high current

Method used

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  • An overcurrent protection method, device, chip and control circuit
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  • An overcurrent protection method, device, chip and control circuit

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Embodiment Construction

[0029] Embodiments of the present invention will be described below with reference to the accompanying drawings.

[0030] First, the technical terms involved in the present invention are introduced:

[0031] IPM: Intelligent Power Module, intelligent power module. The IPM is the core device of the inverter unit that drives the DC motor-like load (eg, the DC compressor in the refrigerator, the air conditioner, the DC fan motor, etc.). Exemplary, figure 1 It is a schematic diagram of the internal structure of an IPM. The IPM includes 6 insulated gate bipolar transistors IGBT (IGBT1-IGBT6 in the figure), 6 FRD (Fast recovery diode, fast recovery diode) (Di1-Di6 in the figure) and a control chip (including HVIC and LVIC in the figure). part). Among them, the control chip is used from U P , V P , W P , U N , V N , W N The 6 pins receive 6 control signals, and pass the U in the HVIC according to the 6 control signals. OUT , V OUT , W OUT pins and U in LVIC OUT , V OUT...

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Abstract

The invention relates to an over-current protection method, a device, a chip and a control circuit, relating to the technical field of electronics. The method can prevent an over current which is tooshort in lasting time in an output circuit of an IPM, so that the reliability of the IPM is improved. The method comprises the following steps: acquiring a first control signal sent by a control module; calculating the lasting time of loading a voltage to a direct current motor; and if the lasting time is longer than or equal to a preset time threshold value, sending the first control signal to the IPM so as to drive the direct current motor to operate according to the first control signal by the IPM. The over-current protection method, the device, the chip and the control circuit provided bythe invention are applied to controlling the direct current motor.

Description

technical field [0001] The present invention relates to the field of electronic technology, and in particular, to an overcurrent protection method, device, chip and control circuit. Background technique [0002] At present, an IPM (Intelligent Power Module, intelligent power module) module is usually used to drive a DC motor to run. In the process of driving the DC motor, when the voltage of the IPM DC bus is high or the motor load is light, etc., and the load is short-circuited at this time, the output circuit of the IPM often occurs for a very short duration but many times. of overcurrent. The output circuit of the IPM is over-current, which can easily cause the IPM to be damaged by short-term heat generation, or even explode. [0003] In order to solve the above problems, in the prior art, the overcurrent protection function of the IPM is usually used to protect the IPM from being damaged under the condition of overcurrent. Specifically, in the prior art, the current o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/085
CPCH02H7/0811H02H7/0838H02H7/085
Inventor 孙德伟张明磊厉杰
Owner HISENSE (SHANDONG) AIR CONDITIONING CO LTD
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