A new method of the DC PWM speed regulation sys- tem is introduced.In the vehicle power system,the low voltage of batteries is always transformed to drive a high voltage motor. In order to deal with this problem,cuk converter which can regulate the armature voltage in a wide span is applied in the PWM speed system.SABER simulation is used to prove the feasibility and to optimize PI parameters.In the last section, the correctness of the cuk PWM system is proved by experi- ment.
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