The inverter consists of main circuit, power circuit, IGBT drive and protection circuit, cooling fan and other parts. Its structure is mostly unitized or modular. Due to the incorrect use method or unreasonable setting environment, it will easily cause the inverter to malfunction and malfunction, or fail to meet the expected operating effect. In order to prevent problems before they occur, it is particularly important to carefully analyze the cause of the failure in advance.
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The braking unit on the inverter refers to the occasions where the mechanical load is relatively heavy and the braking speed is required to be very fast, the regenerative electric energy generated by the motor is consumed by the braking resistor, or the regenerative electric energy is fed back to the power supply. system.
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In the application site, the interference of the inverter occurs more and more seriously, and even the control system cannot be put into use. The working principle of the frequency converter is destined to generate strong electromagnetic interference.
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MOS tubes and IGBT tubes are new electronic devices with high frequency of use in modern electronic equipment, so they are often encountered in electronic circuits and are accustomed to. However, due to the similarity in appearance and static parameters of MOS tube and IGBT tube, sometimes it is easy to travel in the selection, judgment, and use. The reliable identification method of MOS tube and IGBT tube is to clear the obstacles for selection, judgment and use.
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Due to the inconsistency of the parameters of the parallel IGBTs and the asymmetry of the circuit layout, it will inevitably lead to uneven current distribution of the device, and in severe cases, the device will fail or even damage the main circuit. Therefore, the focus of IGBT parallel connection is to consider how to ensure current sharing through design. At present, some existing IGBT parallel current sharing measures include: derating method, gate resistance matching method, emitter resistance feedback method, and external inductance balancing method.
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IGBT is the CPU of power electronic device and plays a pivotal role in power electronic conversion and control. In the inverter, the IGBT module is more important. However, IGBT modules often explode.
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