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1、Parameters Design of Main Circuit of AC Constant Voltage Power Supply Based on Dual Directional Reversible PWM ControlAbstract: The constant voltage power supply with dual directional reversible PWM compensation has merits of high precision, high efficiency, small volume, and so on. To ensure the qu
2、ality of supply, it is important to fix the value of inductance, capacitance in main circuit. From the angle of filtering, and through analysis of the circuit working, detailed formulas of the inductance and capacitance calculation are given and an example of it is given too. In parameters calculati
3、on, to reduce the volume, the filter inductance is taken a smaller value but the capacitance is taken a greater value; the DC smoothing capacitance should be chosen according to the amplitude limit of DC voltage rising in inversion, and should be taken as great as possible to maintain voltage stabil
4、izing precision. Keywords: constant voltage; compensation; PWM rectifier; SPWM inverter; filter. INTRODUCTIONThere are many kinds of AC constant voltage power supply, of which types of parameter adjustment, self-coupled adjustment, full-power transforming1 have following characters: large volume of
5、electromagnetic components, great harmonics of voltage and current, low power factor, so it has some technical advantages in supply compensatiing within small capacity. The constant voltage power supply with compensation adopts the compensation part being increased to realize the stability of output
6、 voltage, it has following characters: simple in circuit, small in capacity, high in precision, quick in response speed. In constant voltage power supply based on dual PWM cotrol, the compensation power can flow in dual direction, is good in comprehensive performances. With the development of micro-
7、computer, speed faster and faster, cost lower and lower, the dual directional reversible PWM constant voltage power supply controled by MCU is becoming the mainstream in AC constant voltage power supply design. MAIN CIRCUIT DESIGNStructure of the constant voltage power supply with compensation of du
8、al directional reversible PWM is shown in Fig.1, Mode of PWM control is adopted in rectifier and inverter.By using PWM rectifier, power factor of AC side can reach to 1; low-order harmonic pollution to line will not be produced; stable DC voltage can be get, and its amplitude is higher than the DC v
9、oltage obtained by diode rectifier, which is favorable for the working of inverter. Mode of SPWM control is used in inverter, by which a good sinusoidal wave can be produced. This sinusoidal wave has the same frequency, same or inverting phase with the line voltage, and after series with the line th
10、rough compensation transformer, a rated output voltage is get finally.A. Structure of Main CircuitMain circuit structure of the constant voltage power supply is shown in Fig.2, rectifier and inverter all adopt single phase full-bridge converter, and switchs adopt IGBT. The primary side of compensati
11、on transformer is connected to the inverter output, the second side is in series between the line and the load. In PWM rectifier circuit2, Ls is AC-side inductance, Lf1 and Cf1 constitute secondary filter of DC, Cd is DC smoothing capacitance. In SPWM inverter circuit, Lf2 Correction TransformerLoad
12、SPWM InversionControl Systemuiu0iii0vcPWM Rectifieric1ic2udFig.1 Struetue diagram of regulate power supplyand Cf2 constitute output filter, by which the compensation voltage is in series with input voltage through compensation transformer T.B. Analysis of Power FlowingDotted terminals of compensatio
13、n transformer T are shown in Fig 3. If , a voltage of c0iUUUcUopposed-phase to line voltage is need to be a negative compensation. It is shown from the direction of and oIpolarity of that the energy flows from secondary side cUto primary side of transformer, through inverter and rectifier then feeds
14、 back to the line, and PWM rectifier works in inverting state. Similarly, If , a voltage of in-phase c0iUUUcUto line voltage is need to be a positive compensation, and the energy flows from primary side to secondary side.When the load is a rated one and the system reaches a steady state, power proce
15、ssed by compensation circuit is:(1)c010UISSPC. Parameters Calculation of Main Circuit1) The Compensation Transformer If the input is , capacity of the U1UUNicompensation transformer is (2）0N0NNNmaxIUUIUUPof which, is the rated voltage of secondary of NUU compensation transformer, is voltage of kUUNp
16、rimary, is ratio.kGenerally, for a certain abundance, DC voltage of inverter should be 20% 30% higher than peak value of the output AC voltage. DC voltage of PWM rectifier is , sodU（3）dcNU30%1V2Then , and ratio of compensation 231UVdcN.transformer is（4）NcNcNcNUUVUVkfinally, is taken to a integer.k 2)Output Filter of Inverter Lf2 and Cf2 constitute LC series resonant filter of inverer output3, resonant frequency is .2f2f2LCLf21In o
