Multi-redundance aircraft electric power source and starting method thereof

The invention discloses a multi-redundance aircraft electric power source and a starting method thereof, belonging to the field of aerospace power supplies. The multi-redundance aircraft electric power source comprises a battery pack, a DC/DC (Direct Current/Direct Current) converter, a voltage detection circuit, a switching circuit and a control circuit, wherein the battery pack supplies a 72V DC input voltage to a power supply system by adopting a concentrated power supply mode, and the DC/DC converter outputs a stable 6V DC power supply to supply power to a load. A redundance technology is adopted in the battery pack and the DC/DC converter, thus the reliability of working of the power supply system is greatly improved. The starting method of the multi-redundance aircraft electric power source comprises the steps of: during electrifying, supplying a 16V DC starting voltage to the DC/DC converter by a starting circuit; and after the DC/DC converter normally works, switching a power supply into a DDS (Direct Digital Synthesis) self-powered system under the action of the control circuit to ensure that the working voltage of a current control chip is changed into 10V from 16V, thus the power consumption of the chip is reduced, and the service life of the chip is prolonged.