Wide voltage input type high-power intrinsic safety power source

The invention discloses a wide voltage input type high-power intrinsic safety power source which comprises an EMI filter circuit (1) connected with alternating currents. The EMI filter circuit (1) is sequentially connected with a rectifying circuit (2), a high-frequency transformer (4), a voltage stabilizing filter circuit (5) and an over-voltage and over-current protection circuit (6) outside. The intrinsic safety power source further comprises a PWM control chip (7) and an MCU module (8), wherein the on-off frequency of a connected first MOS switch tube is controlled through the PWM control chip so that the voltage frequency exerted on a primary level of the high-frequency transformer can be changed and constant output of a secondary level of the high-frequency transformer can be guaranteed, a relay (K1) is connected to the periphery of the MCU module (8), contactors of the relay are controlled to form a voltage doubling rectifying circuit through the rectifying circuit and a filtering capacitor (3) according to the requirement, so that when the alternating current input voltage is low, it is guaranteed that the primary level of the high-frequency transformer can obtain enough input voltage, the range of the alternating current input voltage is expanded, the power source is adapted to voltage input of a wide range, and the flexibility and the interchangeability are strong.