种LLC谐振变换器及其软启动方法

• Format: Patent
• Language: Chinese
• Published: 23.02.2018
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

本申请提供的LLC谐振变换器及其软启动方法，通过控制器控制方波发生器的占空比由基础值逐渐增大，直至控制器判断所述LLC谐振变换器的电流大于所述预设限制值，重新控制所述方波发生器的占空比由所述基础值逐渐增大；经过上述多次循环后，直至所述控制器判断整流单元内滤波电容的电压等于预设电压值，则实现了滤波电容的电压软启动；同时，通过上述对所述LLC谐振变换器的电流的限制，可以减小原副边的冲击电流；由此也实现了电流的软启动，解决了现有技术软启动过程中电流冲击较大的问题，提高了机器的可靠性。 The invention provides an LLC resonant converter and a soft starting method thereof. The duty cycle of a square wave generator is controlled by a controller to be increased gradually from a basic value until the controller judges current of the LLC resonant converter is greater than a preset limit, and the duty cycle of the square wave generator is controlled again to be increased gradually from the basic value; the above step is cycled for multiple times until the controller judges voltage of a filter capacitor in a rectifier unit is equal to a preset voltage value, and voltage soft starting on the filter capacitor is realized; and through limiting on current of the LLC resonant converter, impact current of a primary side and a secondary side can be reduced. Current soft