In this paper a power supply unit (PSU) is proposed, which is used in the grid connected inverter with high power, wide input voltage and better output dynamic characteristics. The PSU adopts silicon carbide(SiC)power de-vices and two switches forward topology with output power 1 000 W. Using the high efficiency PWM control technology, the PSU gets a better work under the PV array with instable voltage. First, the characteristic of SiC power devices is in-troduced, and then, much analysis on the principle and characteristic of the two switches forward topology are given. At the same time the detail design on the SiC-MOSFET drive circuit and the unit of function circuits are analysed, and many verification tests are done for the PSU. The test results prove the feasibility and the superiority of this design.%提出了一种高输出功率、宽输入电压范围、良好输出动态特性的太阳能并网逆变器供电电源。该电源采用碳化硅SiC双管正激电路拓扑，输出功率为1000 W ，通过高效的PWM 调制控制，可以保证在电池板电压变化很宽的范围内，电源输出直流电压的稳定。首先介绍了碳化硅SiC 功率器件的主要特性，分析了双管正激电路拓扑的原理及优点，同时对一些碳化硅SiC-MOSFET 等关键器件和碳化硅SiC-MOSFET 驱动电路和转化效率进行了分析，并对电源进行了大量的验证实验。验证结果证明了该设计的可行性和优越性。
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