| 摘要 |
An apparatus for preventing power backfeed into an inverter circuit having a switching stage for supplying AC power to an output path of the inverter circuit is disclosed. The apparatus comprises a current sensor which senses a current condition in the output path and a switching stage current limiter operable to limit current in the switching stage when said current condition meets a criterion. The current sensor device senses current in the output pa th and compares it with a reference value to determine whether or not it is within a range. If it is not within this range, a signal is communicated to a gate drive controller which prevents gate drive signals produced by the inverter, from reaching the switching devices of the switching stage. This prevention of ga te drive signals from reaching the switching devices occurs very quickly, befor e the damaging AC backfeed power can reach a level sufficiently high to damage the switching devices because the rate of flow of AC backfeed power is limited t o permit disclosed AC backfeed power protection circuitry to operate quickly t o prevent AC backfeed power from reaching damaging levels.
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