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A transient protection circuit for an inverter has a rectifier capable of supplying direct current from an alternating current power source, where protection is provided against a voltage transient in the AC power source. A DC bus is fed by the rectifier. A bus capacitor is connected across the DC b

A transient protection circuit for an inverter has a rectifier capable of supplying direct current from an alternating current power source, where protection is provided against a voltage transient in the AC power source. A DC bus is fed by the rectifier. A bus capacitor is connected across the DC bus. Solid state switches are connected to the DC bus for supplying alternating current to a load. The DC bus voltage is sensed. In response to a transient rise in the DC bus voltage, a resistor is connected across the bus capacitor to provide a discharge path, the solid state switches are disconnected from the DC bus, and after the transient dies away from the DC bus, the solid state switches are reconnected to the bus and the discharge resistor is disconnected from across the bus capacitor.

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A transient protection circuit for an inverter, comprising: a rectifier capable of supplying direct current (DC) from an alternating current (AC) power source; a DC bus fed by said rectifier; a bus capacitor connected across said DC bus; solid state switches for supplying alternating current to a lo

A transient protection circuit for an inverter, comprising: a rectifier capable of supplying direct current (DC) from an alternating current (AC) power source; a DC bus fed by said rectifier; a bus capacitor connected across said DC bus; solid state switches for supplying alternating current to a load; means for sensing the voltage on said DC bus; a resistor; means responsive to said voltage on said DC bus for connecting said resistor in parallel with said bus capacitor if said DC bus voltage exceeds a predetermined voltage; and, means, responsive to said voltage on said DC bus, for turning off said solid state switches if said DC bus voltage exceeds said predetermined voltage, and for turning on said solid state switches and disconnecting said resistor from parallel connection with said bus capacitor if said DC bus voltage is somewhat below said predetermined voltage, whereby said solid state switches are protected from a DC bus overvoltage caused by a transient voltage rise in said AC power source.