Control method of full-bridge LLC circuit and full-bridge LLC resonant transformation device

The invention provides a control method of a full-bridge LLC circuit and a full-bridge LLC resonant transformation device. The full-bridge LLC circuit comprises a first H bridge composed of four switching tubes. The control method of the full-bridge LLC circuit comprises the following step: controlling the time sequence of PWM signals input into the four switching tubes so that the full-bridge LLC circuit works in a half-bridge state, and can output a lower voltage. Compared with the mode of adjusting the frequency to adjust the output voltage, by using the method of the invention, the output voltage range of the full-bridge LLC circuit is expanded so that the full-bridge LLC circuit can output a lower voltage, a very wide frequency adjustment range is not needed, the design difficulty of each parameter in the circuit is reduced, and the cost is decreased. 本发明提供了一种全桥LLC电路的控制方法及全桥LLC谐振变压装置，全桥LLC电路包括由四个开关管构成的第一H桥，所述全桥LLC电路的控制方法包括控制输入四个所述开关管的PWM信号的时序，以使所述全桥LLC电路工作在半桥状态，可以输出较低的电压，相较于调节频率的方式调节输出电压，本发明扩展了全桥LLC电路的输出