| 摘要 |
A pre-charging system for a capacitor in a voltage inverter for an electric motor is provided. The system includes a microprocessor which generates a first control signal, and a pre-charging circuit coupled to the microprocessor. The pre-charging circuit has a counter circuit, a voltage pulse generating circuit, and a drive circuit. The counter circuit generates a first plurality of voltage pulses, in response to the first control signal. The voltage pulse generating circuit generates each voltage pulse of a second plurality of voltage pulses at a respective time interval while an instantaneous current flowing through a pre-charging resistor is less than a threshold level. The drive circuit has a transistor that outputs a third plurality of voltage pulses in response to the second plurality of voltage pulses to increase a voltage across the capacitor. |
