4. Short circuit fault SC 1 When the IGBT is turned on, it enters the short-circuit state, which can be analyzed with the double-pulse test circuit shown in Figure 3. By changing the size of the short-circuit inductance Lsc (within tens of nH), the turn-on and short-circuit behavior characteristics of the down-side IGBT can be analyzed. SC 1 is also the most common short-circuit fault of IGBT. According to the length of the desaturation time (depending on the short-circuit circuit noise), it can be further divided into a type I short circuit and a type II short circuit.
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IGBT is one of the core components in the inverter, and its function is to convert direct current into alternating current. Therefore, the working reliability of the IGBT directly determines the performance stability of the inverter. Once there is a problem with the IGBT, it will cause the failure of the inverter, and even cause irreversible damage to the entire system. So how to detect whether the IGBT is good or bad?
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Overcurrent or short-circuit faults will inevitably occur during the application of IGBTs. When such faults occur, the current of the device will be very large, which will easily increase the junction temperature of the IGBT chip and cause the device to burn out. In order to find out the cause of the fault and find a solution, we generally analyze the fault path when the IGBT is over-current or short-circuited. Let's take the application of two-level inverters as an example to analyze several types of short-circuit faults that are prone to occur in IGBTs, so as to deepen everyone's understanding of short-circuit faults.
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China's IGBT power device industry is an emerging high-tech industry, and has now developed into an industry with important economic significance. IGBT power devices refer to semiconductor components composed of transistors and emitters, used to control current and voltage in electronic circuits, and are more advanced power semiconductor components in the world today
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IGBT devices are collectively referred to as igbt, because all electronic components can be called devices.
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Fast recovery diodes, namely power semiconductor devices, are the bridge between weak current control and strong current operation, between information technology and advanced manufacturing, and are an important foundation of the national economy. With the increasingly urgent demand for energy saving and emission reduction in countries all over the world, power semiconductor devices have moved from traditional industrial control and 4C (communication, computer, consumer electronics and automobile) to new energy, rail transit, smart grid, frequency conversion Home appliances and many other industries.
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