Charge/start system and electric vehicle applying the same

An electric vehicle, comprising:

• a charge-or-start system;
• and
• a motor, the charge-or-start system providing power to the motor;
• wherein the charge-or-start system comprises:
• a charge-or-start device coupled to an external power source;
• an on-car electric source coupled to the charge-or-start device;
• a battery unit coupled to the charge-or-start device for storing and providing power;
• a first magnetic contactor controlled by the charge-or-start device for conducting or breaking a first current flow between the external power source and the battery unit;
• a second magnetic contactor controlled by the charge-or-start device for conducting or breaking a second current flow between the on-car electric source and the battery unit;
• an insulated gate bipolar transistor (IGBT) module for receiving and conducting the first and the second current flows;
• a filter coupled to the IGBT module for filtering voltage of the first and the second current flows;
• a bi-direction DC-DC converter for bucking/boosting voltage of the first and the second current flows;
• a charge-or-start controller for detecting an output voltage of the IGBT module and an output voltage of the bi-direction DC-DC converter to control the IGBT module and the bi-direction DC-DC converter for controlling paths of the first and the second current flows;
• and
• a first and a second current sensor for respectively sensing a current flowing between the second magnetic contactor and the IGBT module;
• wherein:
• in charge mode, under control of the charge-or-start device, one of the external power source and the on-car electric source provides power to the battery unit for charging the battery unit through the charge-or-start device;
• in start mode, under control of the charge-or-start device, the battery unit provides power to the on-car electric source through the charge-or-start device, for activating the on-car electric source.