Wide voltage range low voltage stress current injection type three-phase power factor correction circuit
A current injection, three-phase power technology, applied in the direction of high-efficiency power electronic conversion, output power conversion devices, electrical components, etc., can solve the problems of high voltage stress of output voltage rise or fall devices, and achieve low switching loss and easy implementation. , the effect of a large working range
Inactive Publication Date: 2018-09-18
FUZHOU UNIV
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[0004] In view of this, the object of the present invention is to provide a three-phase power factor correction circuit with a wide voltage range and low voltage stress current injection, which solves the problem that the output voltage can only be raised or lowered in a single way and the voltage stress of existing circuit devices is too large
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[0031] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0032] Please refer to figure 1 , the present invention provides a three-phase power factor correction circuit with wide voltage range and low voltage stress current injection, which is characterized in that it includes a three-phase AC input power supply Uin, a three-phase rectifier bridge DB1, a power MOSFET S1, a power MOSFET S2, Power MOSFET tube S3, power MOSFET tube S4, diode D1, diode D2, diode D3, harmonic current injection network, inductor L1, inductor L2, output filter capacitor Cf and load; the harmonic current injection network includes a bidirectional switch Sy1, Bidirectional switch Sy2 and bidirectional switch Sy3; the three input phase voltages of the three-phase AC input power supply Uin are respectively connected to the three input terminals of the three-phase rectifier bridge DB1, and the three input phase voltages of the three-phase...
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The invention relates to a current injection type three-phase power factor correction circuit having a wide voltage range and low voltage stress. According to an input voltage working range, the circuit can work in a boost mode and also can work in a buck mode; the voltage stress of a switch tube is less than the voltage stress due to direct adoption of typical boost-buck topology (buck-boost, cuk, sepic, zeta); and the circuit has the relatively high conversion efficiency. A convertor in the invention separatelycontrols phase voltage corresponding to current tracking of the maximal phase and the minimal phase of an input voltage instantaneous value; according to three-phase symmetry, another one-phase current also follows the phase voltage thereof, such that sine control of the three-phase current is realized; by means of the staged working modes, the output voltage can be increased and decreased; the working range of input and output voltage is wide; therefore, the circuit is applied to an application occasion having a wide input and output voltage change range; complex vector control is unnecessary in the invention; sine of the three-phase input current can be realized only by adopting a DC / DC PWM control technology; and the circuit is easy to realize.
Description
technical field [0001] The invention relates to a wide voltage range low voltage stress current injection type three-phase power factor correction circuit. Background technique [0002] Harmonic current input from the grid side will lead to low utilization of the power system, large losses, affect the normal operation of electrical equipment and even endanger the stable operation of the entire power grid. A number of harmonic limitation standards regulate the harmonic content of electrical equipment. Such as IEC61000-3-2, GB17625.1 and other standards clearly stipulate the harmonic current limit of electronic equipment, and only electronic equipment that meets the requirements of the specification is allowed to be listed. [0003] The electrical equipment with a power of more than 5 kW usually adopts high-power electrical equipment powered by three phases, which generates large harmonic pollution, but PFC technology has not been widely used, mainly because the development o...
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IPC IPC(8): H02M1/42
CPCH02M1/4233Y02B70/10
Inventor 林维明张强
Owner FUZHOU UNIV