5results about How to "Shorten off time" patented technology

This invention discloses an automatic switching system, method, and drive circuit for an uninterruptible power supply (UPS) in the field of power electronics. It includes a power module for providing electrical energy to the system; a relay switch unit for controlling the switching of mains power input; an accelerated turn-off unit for accelerating the turn-off of the relay switch unit; a circuit switching unit for switching a high-current drive circuit to a low-current drive circuit after a predetermined delay; and a control module for outputting a high-level signal to control the circuit switching unit to switch the high-current drive circuit to accelerate the closing of the relay switch unit, and outputting a low-level signal to control the accelerated turn-off unit to accelerate the turn-off of the relay switch unit. This invention employs a delayed switching drive design and an accelerated turn-off unit, which significantly simplifies the power supply hardware design, reduces the power requirements of the auxiliary power module, and significantly shortens the relay turn-off time, ensuring the stability and reliability of the UPS during the switching process.

The invention provides a novel RC-IGBT structure with a hole circulation path and a good compromise relationship, which comprises a device main body, collector metal is arranged at the bottom of the device main body, a p + collector region, an FS layer, an n-drift region, a groove with a grid electrode at the top, an n + emitter region, a p + contact region and a p base region are sequentially arranged upwards, a second CS storage layer is arranged at the bottom, and the emitter composite structure on the two sides comprises a deep p-type region, a deeper p-type region, a hole channel and a CS storage layer. Through the above structure, the deep p-type region and the deeper p-type region optimize the electric field distribution, improve the doping concentration of the CS layer, enhance the hole accumulation effect, reduce the conduction voltage drop, accelerate the carrier export during the turn-off of a hole channel, and shorten the turn-off time, and at the same time, under the short-circuit working condition, the structures cooperatively export holes, weaken the conductivity modulation effect, improve the short-circuit endurance capability, and improve the performance of the device. And finally, good balance of voltage resistance, conduction voltage drop and switching speed is realized, and the comprehensive performance of the device is remarkably improved.

A gate drive circuit adapted to high junction temperature environments, and its turn-on and turn-off methods, are disclosed. The gate drive circuit includes a main three-terminal transistor, a turn-off circuit, and an auxiliary circuit. The added auxiliary circuit generates an auxiliary current signal, either in the same direction or opposite to the control signal current, to the control electrode of the main three-terminal transistor during the turn-on and turn-off processes within a preset time period. This disclosure enables the generation of corresponding positive or negative auxiliary current signals at the control electrode of the three-terminal transistor. During the conduction process, the auxiliary circuit can generate a reverse auxiliary current signal at the control electrode of the three-terminal transistor during the current rise phase, reducing the drive current of the turn-on signal to decrease di. d / dt, suppressing the turn-on current; during the turn-off process, the auxiliary circuit can generate a unidirectional auxiliary current signal at the control electrode of the three-terminal transistor in the current-decreasing segment, increasing the drive current of the turn-off signal and accelerating the turn-off speed.

This application relates to the technical field of circuit transformers, and in particular to a BUCK circuit based on the UC3843, comprising: a control module for receiving a transformer signal and generating a switch on / off signal based on the transformer signal; a drive module connected to the control module to receive the switch on / off signal and isolate and transmit the switch on / off signal to generate an isolation on / off signal; and a voltage adjustment module for receiving the isolation on / off signal and adjusting the voltage output according to the isolation on / off signal. This application converts a higher DC input voltage to a lower DC output voltage. The circuit achieves the same function as a transformer through a step-down method, reducing costs and improving space utilization.

The utility model relates to an output switching tube driving circuit, which comprises a first triode, a second triode and a switching tube, and is characterized in that the emitter of the first triode is connected with a third resistor, and the base of the first triode is connected with a common diode, a first resistor, a voltage stabilizing diode and the switching tube; the collector of the first triode and the collector of the second triode are connected with a second resistor. The emitter of the second triode is also connected to the second resistor, and the base of the second triode is connected with the field switching tube; the second resistor is connected with the first power input end. Compared with a traditional switch tube driving circuit, the switch tube driving circuit provided by the embodiment has the advantages of being high in load capacity and capable of meeting the high-power requirement.