The invention discloses an ultra-wide voltage range isolation type LLC converter. The isolation type LLC converter comprises two high-voltage side H-bridge circuits, two LLC resonance circuits, two isolation transformers with the same transformation ratio and a three-phase bridge circuit, wherein the two high-voltage side H-bridge circuits are connected with an input end power supply, and primarysides of the isolation transformer are respectively connected with midpoints of the corresponding LLC resonance circuits and the H-bridge circuits; secondary sides of the isolation transformers are connected in series in a reversed polarity manner, and three nodes of a transformer bank are respectively connected to neutral points of the three-phase bridge circuit after series connection. Accordingto the ultra-wide voltage range isolation type LLC converter, the advantages of LLC frequency conversion and voltage regulation are utilized; series connection and parallel connection rapid switchingis achieved by combining PWM pulse 180-degree phase shift, output voltage adjustment within a wide range can be achieved, meanwhile, the direct-current voltage regulating function of a PWM rectifierwithin a certain safety range is achieved, and the ultra-wide voltage range isolation type LLC converter has the advantages of being small in switching loss, high in efficiency, high in power densityof the power supply and small in size.
本发明公开了一种超宽电压范围隔离型LLC变流器,包括2个高压侧H桥电路、2个LLC谐振电路、2个同变比的隔离变压器和三相桥电路;其中,2个高压侧H桥电路连接输入端电源,隔离变压器的原边分别接对应LLC谐振电路和H桥电路的中点;隔离变压器的副边反极性串联连接,串联后变压器组的3个节点分别接至三相桥电路的中性点;本发明利用LLC变频调压的优势,结合PWM脉冲180º移相实现串联和并联快速切换,可实现宽范围内输出电压调整,同时发挥PWM整流器一定安全范围内的直流电压调压功能,本发明具有开关损耗小,效率高,电源的功率密度高,体积小的优点。
Ultra-wide voltage range isolation type LLC converter
一种超宽电压范围隔离型LLC变流器
2020-04-17
Patent
Electronic Resource
Chinese
IPC: | H02M APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS , Anlagen zur Umformung von Wechselstrom in Wechselstrom, von Wechselstrom in Gleichstrom oder umgekehrt, oder von Gleichstrom in Gleichstrom und zur Verwendung in Netzen oder ähnlichen Stromversorgungssystemen / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen |
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