Soft starter device triggering circuit power supply source

The invention relates to a power supply source of a trigger circuit in a 6/10KV soft start device. The power supply source comprises a high-frequency adjustable constant-current supply, a single-turn electric current loop, a coupling mutual inductor and a voltage stabilizing circuit, wherein the high-frequency adjustable constant-current supply sequentially passes through the coupling mutual inductor of each trigger unit to form the high-frequency single-turn electric curent loop; the electrical energy is coupled to each trigger unit, and a stable trigger power supply is obtained through a voltage stabilization circuit. The insulating energy supply problem of the trigger circuit of a thyristor convertor valve series element in a middle and high pressure soft start device and a deflector is solved, the stable power supply and high dielectric strength of the trigger circuit are ensured, the volume is small, the fabrication technology is simple, and the integrated connection is easy to be realized. The invention can be applied to the control of the middle and high pressure soft start and the insulating energy supply of the trigger circuit of the thyristor series element in a high-frequency convertor valve, and the invention is universal and worth popularizing.