Description
The IGCT combines the high-speed switching characteristics of the IGBT (insulated gate bipolar transistor) with the high blocking voltage and low on-loss characteristics of the GTO (gate off thyristor), and the trigger signal is generally transmitted to the IGCT unit through the optical fiber. In the phase module of the ACS6000 marginal rectifier unit, each phase module consists of an IGCT and a continuing diode, a clamp capacitor, and a damping resistor, and is provided with energy by an independent gate power supply unit GUSP. IGBT module is only a part of the power device package as a module, IGBT module products can generally be single tube, double tube (half bridge) or 6 tube (full bridge), there are also three levels of 12 just package as a module. Because it has been packaged as a module, it is electrically insulated and the installation process is simple; IGCT does not have this advantage, which makes the design, installation and maintenance of the system complicated, and the contradiction between insulation and heat dissipation makes the system more problematic. IGBT low power drive can be done together, high power requires a separate drive board. dsp is the control core, as well as external io, internal signal acquisition, processing, drive signal buffering, drive signal isolation, amplification, in order to reach the GE pole of IGBT. Optical fiber isolated transmission drive signal. The IGBT on-off frequency is high, but dv/dt is the on-off speed is low, there is a certain contradiction, only the speed is fast enough, the frequency can be high enough. Plus the absorption circuit or IGBT to take soft off, the absorption circuit is the possible 10kv/us absorption, soft off refers to reduce the switch off speed, artificially caused off the tail, the benefit is to reduce dv/dt, the harm is to increase the IGBT loss, so to carefully adjust the off time. When the IGBT driver circuit turns off the IGBT, a negative voltage is applied at GE (positive voltage is applied on), and a micro resistor is placed at the micro capacitor, so that the GE voltage drops slowly, thereby reducing dv/dt.
ABB power module features and applications ABB power module uses advanced integrated circuit technology to integrate power devices and logic control circuits in a highly integrated, fully sealed integrated block with power function. The power module has the advantages of convenient use and reliable performance, which represents the development direction of power supply technology. Because the switching power supply has the advantages of high efficiency and small size, it is suitable for integration. Because of its low efficiency, generally about 50%, it is difficult to achieve high-power (more than 100W) integration. The power module introduced by Jimi technology refers to the switching power module, focusing on the DC/DC converter. Today's switching power modules can reach hundreds of watts or even kilowatts. Power module products mainly include DC/DC converter module, power factor correction module, AC input module, etc. Their main characteristics are: ◆ ABB power module working frequency is high, generally 300KHz~1MHz. ◆ ABB power module size is small, ultra-thin, thickness is generally less than 20mm, light weight, generally less than 200g. ◆ ABB power module power density is large, generally 5~10W/ cubic centimeter. ◆ ABB power module is easy to use, less external components, can be expanded in parallel, and can also realize logic control and remote control. ◆ ABB power module is suitable for a wide range of power grid voltage changes. When the general AC voltage fluctuates between 150V and 280V, the output has a voltage regulator function. ◆ ABB power module temperature adaptation range is wide, can be from -55 degrees Celsius ~+100 degrees Celsius, the general high temperature substrate temperature is +85 degrees Celsius, low temperature 0 degrees, -20 degrees, -40 degrees, -55 degrees and other levels. ◆ ABB power module fully sealed package, with three anti-function, waterproof, dustproof, anti-impact. ◆ ABB power modules generally use zero voltage switch or zero current switch technology, good electromagnetic compatibility. ◆ ABB power module structure is highly standardized and easy to install.
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