Power consumption control circuit, intelligent power module and frequency variable household appliance

Abstract

The invention provides a power consumption control circuit which comprises a low-power-consumption switch element and a switching control module. The low-power-consumption switch element is connected to any IGBT in an intelligent power module in parallel to form a switch assembly, and the switching control module is connected to a control chip corresponding to the intelligent power module, used for only enabling any IGBT or simultaneously enabling any IGBT and the low-power-consumption switch element to be in the working state under the condition that a high-frequency working signal coming from a control chip is received, and used for only enabling the low-power-consumption switch element to be in the working state under the condition that a low-frequency working signal coming from the control chip is received. The invention further provides the intelligent power module and a frequency variable home appliance. According to the technical scheme, different on-off parts can be adopted at the different working frequencies, the power consumption of the intelligent power module is easily reduced accordingly, and the risk that the on-off parts are broken down by an overcurrent can be avoided.

Description

technical field [0001] The present invention relates to the technical field of power consumption control, in particular to a power consumption control circuit, 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 reli...

AI Technical Summary

Problems solved by technology

[0028] For the state of low-frequency operation of the compressor, it is often desired to obtain low power consumption. When using IGBT tubes as on-off components, due to the tailing effect of IGBT tubes, the switching loss of the on-off components cannot be very low, so that the smart power The loss of the module 100 cannot be made very low

[0029] If the IGBT tube is replaced by a non-smearing MOS tube, the on-off loss and system power consumption can indeed be reduced when the compressor is working at low frequency, but due to the limitation of the current capacity of the MOS tube, when the compressor enters A large current will exceed the current range that the MOS tube can withstand, causing the MOS tube to burn out due to overcurrent, and even cause a fire in severe cases

[0030] In the related technology, the low-frequency operating loss of the intelligent power module is reduced by improving the tailing effect of the IGBT tube, but this special process makes the production cost of the IGBT tube very high, which is not suitable for popularization in civilian fields such as inverter air conditioners.

[0031] Therefore, how to reduce the loss of the intelligent power module when it works at low frequency, and avoid the risk of overcurrent when it works at high frequency, and how to make the production cost suitable for the civilian field has become a technical problem that needs to be solved urgently.

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