| 摘要 |
An inverter circuit for use in connection with loads such as motors and transformers is disclosed. The inverter includes separate precharge circuitry for precharging the commutating capacitor, clamping diodes for clamping the voltage on the inverter power elements to the precharge voltage level, and steering diodes for coupling the motor or transformer to the SCRs. The steering diodes allow the commutating capacitors to be charged to a precharge voltage level which is selected to be at least twice the maximum voltage to be applied to the load. The clamping diodes, by limiting the maximum voltage on the inverter power components, allows the use of components of substantially reduced voltage ratings. The precharge circuit provides reliable commutation at low motor speeds and voltage levels. Other embodiments and improvements are disclosed.
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