Overcurrent protection device, intelligent power module and frequency-conversion household appliance

Abstract

The invention provides an overcurrent protection device which comprises a comparison circuit which is connected to a current sampling element of an intelligent power module and is used for comparing real-time voltage analog signals from the current sampling element with a standard voltage analog signal, and generating corresponding analog control signals according to the comparison results; and an integration circuit which is connected to the comparison circuit and a controller corresponding to the intelligent power module and is used for integrating analog sequence signals from the controller with the analog control signals and outputting the integrated analog sequence signals to the intelligent power module. The invention also provides the intelligent power module and a frequency-conversion household appliance. Through the technical scheme in the invention, overcurrent protection can be achieved more quickly when abnormities, such as interference, cylinder blocking, and voltage sag and the like, occur to the intelligent power module, thereby avoiding the safety hidden trouble due to control delay.

Description

technical field [0001] The invention relates to the technical field of overcurrent protection, in particular to an overcurrent protection device, an intelligent power module and a frequency conversion household appliance. Background technique [0002] Intelligent Power Module, or IPM (Intelligent Power Module), is a power drive product that combines power electronics and integrated circuit technology. The intelligent power module integrates the power switching device and the high-voltage driving circuit, and has built-in fault detection circuits such as overvoltage, overcurrent and overheating. On the one hand, the intelligent power module receives the control signal from the MCU to drive the subsequent circuit to work, and on the other hand, it sends the system status detection signal back to the MCU. Compared with the traditional discrete solution, the intelligent power module wins more and more markets due to its advantages of high integration and high reliability. An i...

AI Technical Summary

Problems solved by technology

[0025] However, the sampling of the voltage across the resistor 138 by the MCU200 is not real-time, there will be a certain time interval, and in the sampling and overcurrent protection control process of the MCU200, it needs to undergo multiple analog-to-digital or digital-to-analog conversions, so that the MCU200 detects The time elapsed from the abnormal voltage to the output of Pin1, Pin2, Pin3, Pin4, Pin5, and Pin6 is generally about 10 μs. If the current flowing through the resistor 138 is large enough, within 10 μs, the IGBT on the current path will Both the tube and the resistor 138 may be damaged, even overheated and burned, and in severe cases, it will cause an explosion

[0026] Therefore, how to avoid the potential safety hazard caused by the delay when implementing over-current protection has become a technical problem to be solved urgently.

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