| 摘要 |
PURPOSE: An electric power supply for a vehicle is provided to cope with the cutoff of a main power source by supplying main power shut-off signals to an electronic device. CONSTITUTION: An electric power supply for a vehicle comprises a main power supply part(210), a main power supply determining part(220), and a power selecting part(230). The main power supply pat receives and transmits main power source(MP) from the inside of a vehicle. The main power supply determining unit decides the stable supply state of the main power source and generates power source selection signals(PSS) which decides the main power source or a charging power source. In case main power source is not provided, the electronic devices cope with the cutoff of the main power source by transmitting main power source shut-off signals(MPBS) to the electronic devices(260).
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