Delay circuit and electronic device having the same

摘要

An electronic device (100) receives a voltage from a power supply (1). The electronic device (100) includes a load (3), a first adjusting module (21), a switching module (23), a delay module (25), and a second adjusting module (27). The first adjusting module (21) produces a working voltage when the electronic device (100) is powered on. The switching module (23) establishes an electrical connection between the first adjusting module (21) and the load (3) when receiving the working voltage, and cuts off the electrical connection when not receiving the working voltage. The delay module (25) delays outputting the working voltage to the load (3) for a first predetermined time period on power up, and maintains a power supply to the load (3) for a second predetermined time period after power off. Both the first predetermined time period and the second predetermined time period are independently adjustable.