| 摘要 |
A DC-AC bi-directional power converter topology located between AC grid and DC storage battery implements charging and discharging between DC storage battery and AC grid. The topology comprises a bi-directional DC/DC converter circuit, a bi-directional DC/AC converter circuit, a DC filtering and protection circuit at high voltage side, a DC filtering capacitor at high voltage side, a detection circuit and a driving and control circuit. The bi-directional DC/DC converter circuit works as follows: when the DC storage battery is discharging, the voltage wave at high voltage side being a positive half wave varying sinusoidally, enabling DC/AC conversion part only to need to work in a power frequency state not in a high frequency pulse modulation state, and greatly reducing the switching consumption of the DC/AC bridge circuit. Meanwhile, a high frequency power transformer with high efficiency is adopted to implement conversion of the DC/DC part, developing the function of boosting, sinking and electrical isolation and greatly increasing the whole conversion efficiency. |
