Based On Single-phase Bridge Topology Active Pfc Inverter Heat Pump Thermal Station Power

With the development of power electronics technology, the rectifier, inverter, electric arc furnace, switching power supply and other non-linear loads in the power system are increasing. These power equipments which exist impulsion and imbalances will severely cause distortion to network side input current, produce a large number of harmonic pollution and lead to low power factor.Power Factor Correction (PFC) technology is to study how to use appropriate circuit topology and control strategy to make the current waveform of the input side to follow the input voltage waveform, decrease the harmonic pollution from the grid and improve the system power factor (PF). Currently, most electrical devices are using Boost-type PFC corrector to make the power factor close to 1. However, the traditional Boost-type PFC power switching devices are always in PWM switching state in each cycle of power, during this time they bear a high voltage, strong current and thermal stress, which bring a lot of switching losses, conduction losses and limit the improvement of the efficiency of the system. For the inverter heatpump heating station in the applied frequency-conversion industry, it requires high power rating. In this case, the use of traditional active-Boost Power Factor Correction technology will cause a very serious heating problem to power devices, so the design of power supply system which has a better Power Factor Correction effects and higher efficiency become an emerging research topic.The study of this paper also follows this hot spot and designs a new Bridgeless Topology Active Power Factor Correction (BLPFC) circuit for the high power frequency-conversion heatpump heating station. Although it is still a Boost type DC/DC converter, it can effectively improve the efficiency of the system switching devices and reduce system heat dissipation and costs. In this paper, I have done the simulation of the designed Bridgeless Topology Active Power Factor Correction circuit, which adopts dual closed-loop average current control strategy, using the SimPowerSystems kit in Matlab/Simulink software.The results show that the output DC voltage of the power supply system based on BLPFC is stable, ripple voltage is low, the input current waveform is able to follow the input voltage waveform, the power factor can reach nearly 1, and reactive power is low. After the input current gets into the steady-state, the paper gets Fourier analysis through powergui tool implements. The result show the 2-40 harmonic content is low, which indicates Bridgeless Active PFC Topology can effectively improve the utilization efficiency of the grid and suppress current harmonics.Finally, the paper designs a capacity of about 5KW limit-driven power system for inverter heat pump heating station, which uses FPDB30PH60 and UCC3818. FPDB30PH60 is a representative bridgeless topology Smart Power Module (SPM), and UCC3818 is an Average Current Control Chip. The adoption of smart power module designed for single-phase Bridgeless Topology Active PFC program can save a lot of development time, improve system reliability, reduce system cost, save board space and less difficult to install. Similarly, the system can not only reach a high power factor, but meet the current harmonic specifications.