The invention discloses a single-phase and three-phase compatible conversion circuit. The circuit comprises an EMC module, a PFC module, a switch K1 and a control module. The EMC module is connected between A, B, C and N lines of a power grid and the PFC module. Three wires A1, B1 and C1 are led out from the EMC module and are connected with the PFC module; the three wires A1, B1 and C1 are respectively connected to a set virtual midpoint through capacitors CX1, CX2 and CX3; the virtual midpoint is connected with a bus midpoint of the PFC module through the switch K1, and the control module isused for detecting a power grid input signal and controlling the state of the switch K1 according to the type of the power grid input signal. By adopting the technical scheme of the invention, the common-mode noise of the three-phase conversion mode can be reduced, and meanwhile, the three-phase conversion mode can adopt a control mode with a larger bus voltage regulation range; when a single-phase conversion mode is switched, the influence of common-mode noise on the direct-current side on the input EMC can also be reduced.
本发明公开了一种单三相兼容的转换电路,其包括:EMC模块、PFC模块、开关K1及控制模块,所述EMC模块连接于电网的A、B、C、N线和所述PFC模块之间,所述EMC模块引出A1、B1、C1三线与所述PFC模块相连接,且A1、B1、C1三线分别通过电容CX1、CX2和CX3连接至设置的虚拟中点,所述虚拟中点通过所述开关K1与所述PFC模块的母线中点相连,所述控制模块用于检测电网输入信号并根据电网输入信号的类型来控制所述开关K1的状态。采用本发明的技术方案,可降低从三相转换模式共模噪音,同时保证三相转换模式可采用较大母线调压范围的控制方式;切换到单相转换模式时也能减少直流侧的共模噪声对输入EMC的影响。
Single-phase and three-phase compatible conversion circuit and vehicle-mounted charger
一种单三相兼容的转换电路及车载充电机
2020-05-12
Patent
Electronic Resource
Chinese
IPC: | H02J CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER , Schaltungsanordnungen oder Systeme für die Abgabe oder Verteilung elektrischer Leistung / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / 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 |
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