300B and 845 power electronic tube driving circuit

The utility model relates to a driving circuit applied to the 300B and the 845 power triodes, which comprises a triode 2A3, a transformer T1 and inductance coils B1 and B2, wherein one end of a primary side coil of the transformer T1 is connected with an anode of the power triode, and the other end is connected with a positive voltage V2; one end of the inductance coil B2 is connected with a grid electrode of a power electronic tube, and the other end is connected with a negative voltage -VB; one end of the inductance coil B1 is connected with the anode of the electronic triode 2A3, and the other end is connected with a voltage source V1; the anode of the electronic triode 2A3 is connected with the grid electrode of the power electronic tube through a capacitor C3; a driving signal is connected with the anode of the electronic triode 2A3; and the anode of the electronic triode 2A3 is connected with an adjustable negative voltage -VA through a resistor. The driving circuit has small variation of the load imped