| 摘要 |
A system for energizing an AC load from an inverter, or from other single- or multi-phase power sources or combination thereof, includes a series filter comprising a capacitor coupled in series with an inductor. The filter elements are resonant at the normal operating frequency of the inverter. Responsive to a large overload or a fault condition in the system, a virtual short circuit is applied across one of the filter components to detune the filter. Alternatively if a load exceeding a specified value is applied, a clamp detunes the filter. This significantly increases the effective impedance seen by the inverter or other power sources, protecting the system against excess currents.
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