3results about How to "Resolve reverse recovery" patented technology

The application discloses a bridgeless Cuk PFC converter based on a switched-inductor-capacitor structure, which comprises switching tubes S1-S3, diodes D1-D4, inductors L1-L5, capacitors C1, C2 and C o The diodes D3 and D4, the capacitor C2 and the inductors L3 and L4 form a switched-inductor-capacitor structure. The original freewheeling diode is replaced by the switched-inductor-capacitor structure, so that the voltage gain of the converter is D / 2(1-D), compared with a traditional Cuk PFC converter, the converter realizes positive voltage output and improves the voltage reduction gain, and the duty cycle range in the voltage reduction mode is wider. Meanwhile, the bridgeless structure is adopted, so that lower on-state loss can be realized. The converter has continuous input and output currents, high power factor and high efficiency, and has rich application.

The utility model provides a kind of bidirectional gallium nitride T type three-level power module and circuit board, wherein, upper bridge arm switch device, midpoint bidirectional switch device and lower bridge arm switch device are all bidirectional gallium nitride power switch;The first drive reference pin of upper bridge arm switch device is connected direct current positive bus;The first drive reference pin of midpoint bidirectional switch device and the first drive reference pin of lower bridge arm switch device are connected to the second drive reference pin of upper bridge arm switch device;The first drive reference pin of midpoint bidirectional switch device and the first drive reference pin of lower bridge arm switch device are also connected to the second drive reference pin of upper bridge arm switch device;The second drive reference pin of midpoint bidirectional switch device is connected direct current neutral line;The second drive reference pin of lower bridge arm switch device is connected direct current negative bus, can reduce the quantity of power tube, reduce conduction loss.

The application discloses a Cuk type power factor correction circuit based on a switching inductor, which comprises switching tubes S1-S3, diodes D1-D5, inductors L1-L5, capacitors C1 and C o Among them, diodes D3-D5 and inductors L3 and L4 form a switching inductor structure.The converter voltage gain is D / (2-D), compared with a traditional Cuk PFC converter, the power factor correction circuit realizes positive voltage output, improves the step-down gain, ensures that the whole duty cycle range is in a step-down state, and the duty cycle is larger than that of the traditional Cuk PFC converter in the case of high step-down ratio, and the emergence of the limit duty cycle condition is effectively avoided.The application of the bridgeless structure can realize lower on-state loss.The power factor correction circuit has the advantages of continuous input and output current, high power factor and high efficiency, and has great practical value.