The Function and Basic Types of Buffer Circuits for Power Electronic Devices(snubber circuit)Also known as an absorption circuit, it is an essential protective circuit for power electronic devices, used not only for the protection of semi-controlled devices but also for fully controlled devices.(As per your instruction, there is no Chinese content provided to translate. Please provide the text you would like translated.GTR、GTOPowerMOSFETNo Chinese content provided.IGBTWait)Thyristors play a crucial role in the application technology. To prevent excessive current rise that could damage the device when a thyristor is turned on, a choking inductor is often inserted in series with the main circuit to limit excessive currents.di/dtSeries inductors and their accessories make up a series buffer circuit, also known as a series decoupling circuit. When a thyristor is turned off, the supply voltage suddenly appears across the tube. To suppress the instantaneous overvoltage and excessive voltage rise rate, and prevent the thyristor from being incorrectly triggered due to excessive junction capacitance current, it is necessary to parallel a resistor across the two ends of the thyristor.RCThe network, which constitutes a shutdown buffer circuit, also known as a parallel buffer circuit.GTR、GTOAll full-featured self-quenching devices must be paired with on/off buffering circuits in actual use.;But its function and the buffer circuit of the thyristor differ, as does the circuit structure. The main reason is that the operating frequency of the full-control device is much higher than that of the thyristor, so conduction and switching losses are one of the important factors affecting the normal operation of this switching device. For example,GTRDuring the switching process of dynamic switches, the phenomenon of secondary breakdown is prone to occur, which is directly related to switching losses. Therefore, it is crucial to reduce the switching losses of full-control devices, and this is precisely the main function of the buffering circuit, namely...GTRWith powerMOSFETUtilize buffer circuits to suppressdi/dtAnddu/dtThe primary purpose is to alter the switching trajectory of the device, thereby reducing switching losses, and subsequently enabling the device to operate reliably. Without a buffering circuit...GTRCollector voltage during switchinguCEWith Collector CurrentiCWaveforms are present during both the opening and closing processes.uCEAndiCThe moment of simultaneous achievement of high values.;Therefore, there was an instantaneous high switching power loss.PonNo Chinese content provided.PoffThe risk to the device's safety was thus compromised. Therefore, it is advisable to implement开通and关断buffer circuits to suppress the surge during switching.di/dtPlease provide the Chinese content to be translated.du/dtPlease provide the Chinese content to be translated.uCENo Chinese content provided.iCThe high values do not appear simultaneously.GTRDuring the switching processuCEAndiCThe company's trajectory, where the trajectory1No Chinese content provided.2In the absence of a buffering circuit, the service was initiated.uCEByUCC(Power Voltage)Descending along a rectangular trajectory0No Chinese content provided.iCBy0Promoted toICM;Shut downiCPlease provide the Chinese content you would like translated.ICMDescending along a rectangular trajectory0No content provided.uCEBy0No Chinese content provided.UCCNot only do the high values of collector voltage and current occur simultaneously, but there is also overshoot in both voltage and current. In this situation, the instantaneous power consumption is high, leading to localized hotspots.GTRThe device was damaged due to secondary breakdown. Adding a buffering circuit...uCENo Chinese content provided.iCThe opening and closing track records, respectively.3No Chinese content provided.4Shown, it is apparent that the trajectory is no longer rectangular, thus avoiding the occurrence of both high values simultaneously. This significantly reduces switching losses and makes efficient use of space.GTRThe electrical performance.GTRThe launch of a buffer circuit to limit conduction during operationdi/dtTo prevent overheating of components, and it also...GTRInverters also play a role in suppressing the peak current of through short-circuit currents.di/dtThe role of...GTOThe shutdown buffer circuit not only limitsGTOIncrease Voltage at Shutdowndu/dtAnd overvoltage, and to reduceGTOThe shutdown loss, enabling...GTODemonstrate effective shutdown capabilities and fully leverage its load-bearing capacity plays a crucial role.IGBTOur buffer circuit's function is more focused on absorbing and suppressing overvoltage during the switching process.IGBTOur work frequency can reach up to30~50kHz;Therefore, even a very small circuit inductance can cause quite a significant...LdiC/dtThus, overvoltage was produced, posing a risk toIGBTThe safety of our customers.PWMInverterIGBTIn shutdown and startup phasesuCEAndiCWaveform.iCDecreasing trendIGBTAn overvoltage occurred, with a value exceeding the power supply voltage.UCCAndLdiC/dtThe combination of both. At the time of launch.uCENo Chinese content provided.iCWaveforms, Rapidly GrowingiCAn overcurrent spike has occurred.iCPPlease provide the Chinese content you would like translated into American English.iCPWhen dropping back to a steady state, an excessive current decay rate can also cause overvoltage on the components, which needs to be absorbed. In inverters...IGBTA peak current issue arose during the launch, due to the initial conductionIGBTThe reverse recovery current of the continuous current diodes connected in parallel and in series with the complementary transistors in the bridge arm is superimposed on the load current, therefore, before the diode recovers and blocks, it is just conducting.IGBTInstantaneous short-circuit through the inverter bridge armiCPeak occurrences require the addition of a current-limiting inductor, i.e., a series buffering circuit, or amplification.IGBTThe capacity. In summary, the buffering circuit is essential for high-frequency self-destroying devices, as it regulates voltage, limits current, and suppresses...di/dtNo Chinese content provided, original return: "And"du/dtThe switching losses are transferred from the device's internal circuitry to the buffer circuit, where they are then dissipated on the buffer circuit's resistors, or the buffer circuit attempts to feed them back into the power source. This buffer circuit can be divided into two types: the first is an energy-dissipating buffer circuit, and the second is a feedback buffer circuit. The energy-dissipating buffer circuit is simple and widely used in applications where the power electronic device's capacity is not large and the operating frequency is not high.