Intelligent power module

Abstract

The invention discloses an intelligent power module which comprises an HVIC tube, a three-phase bridge inverter circuit, a switching tube, a diode, a detection resistor and a comparator. The HVIC tubeis connected with the three-phase bridge type inverter circuit and is used for receiving an external control signal and controlling each switching device of the three-phase bridge type inverter circuit to finish inversion; external alternating current is rectified into direct current; the three boost unit circuits are connected in parallel, respectively input into the intelligent power module through three inductors connected in parallel, respectively form three boost unit circuits connected in parallel with a switching tube and a diode in the module, detect the current of a PFC circuit through three detection resistors, output the current to the outside through a comparator, and externally control the three boost unit circuits to work. The staggered PFC circuit and the inverter circuit are integrated, current ripples are reduced, local heating of the module is reduced, integrated packaging is adopted, the cost of independent packaging is saved, and the reliability is improved.

Description

technical field [0001] The invention relates to the technical field of power semiconductors, in particular to an intelligent power module. Background technique [0002] In most home appliance applications, the mains power needs to be converted into DC power through a rectifier bridge and a PFC (Power Factor Correction) circuit. At present, the PFC in home appliances such as air conditioners adopts the boost circuit form, such as figure 1 Shown: Insert a boost circuit between the rectifier bridge and the large electrolytic capacitor, force the current to follow the voltage change, and keep the two in the same phase, there is no obvious waveform distortion, so that the power factor of the circuit is close to 1. From the working principle of the boost circuit, it can be seen that the current of the inductor works in a continuous mode and can be modulated in the entire power frequency cycle, so the circuit can achieve a relatively high power factor. Compared with other circuit...

AI Technical Summary

Problems solved by technology

Switching at high currents can also cause serious electromagnetic interference, causing EMI problems

In addition, the volume and weight of the external inductor need to be large, and it cannot be directly soldered on the PCB, which brings great difficulties to the structural design.

For the PFC and inverter two-in-one modules currently on the market, due to the large current that the PFC part bears, it causes serious local heating.

In order to improve heat dissipation, it is also necessary to add a heat sink under the PFC wafer, which increases the difficulty and cost of the process

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