Engine start system of hybrid vehicle and method for controlling the same

An engine start system of a hybrid vehicle, comprising:

• a converter package includes:
• a converter circuit unit configured to convert voltage and output the converted voltage;
• a first output port connected to an output terminal of the converter circuit unit;
• a switch having a first terminal connected to the output terminal of the converter circuit unit and a second terminal selectively forming an electrical connection with the first terminal;
• a diode having an anode connected to the second terminal and a cathode connected to the first terminal;
• a second output port connected to the second terminal;
• and
• a controller configured to adjust a connection state of the switch;
• a battery connected to the second terminal;
• and
• a low-voltage starter connected to the battery, and configured to provide rotary power to start an engine in a stopped state by converting power of the battery into rotational energy,
• wherein the controller is configured to open the switch and drive the low-voltage starter when the engine is started, and
• wherein when a fault of the converter circuit unit occurs in an open state of the switch, power is supplied from the battery to the output terminal of the converter circuit unit through the diode.