The utility model discloses a control system high pressure auxiliary circuit uses the current control chip, a serial communication port, establish ties including resistance R1 and stabilivolt D1~D5, resistance R1 and R2 are parallelly connected, resistance R2 and stabilivolt D6, D7 and resistance R4 establish ties, and the first loop and resistance R2 establish ties, and the first loop is last tobe provided with resistance R3 and to insert the chip and supply power, resistance R2 still establishes ties with the second return circuit, be provided with electric capacity C1 on the second returncircuit, the tertiary circuit is established ties with R2, is provided with transformer T1, MOSFET pipe M1 and resistance R13, silicon controlled rectifier S1 on the tertiary circuit, electric capacity C1 is full of electricity back boosting, and behind the arrival silicon controlled rectifier S1 on -state voltage, the silicon controlled rectifier S1 switch on, and the chip is started working. Thesystem adopts the current control chip to realize. The system at first utilizes resistance R1 and stabilivolt D1~D5 to carry out the partial pressure, suspends auxiliary electrical power source in the ground potential, and then utilizes resistance R2 and stabilivolt D6, and D7 carries out the partial pressure and reduces the magnitude of voltage that auxiliary electrical power source bore.