The invention provides a downhole digital power supply
system including a mud generator and a rectifying module connected to the output end of a mud generator. The rectifying module converts the induced
alternating current generated by the mud generator into rectified current and outputs the rectified current. The rectifying module also includes a compensating fluctuation switch which conducts when the
voltage amplitude of the induced
alternating current output by the mud generator exceeds a preset range. A
power load is connected to an output end of the
rectifier module via a compensating fluctuation switch to be turned on. When the rotor and
turbine blades of the mud generator are out of
sync, the
voltage amplitude of the induced
alternating current output from the mud generator is not within the preset
voltage amplitude range, At this time, that compensate fluctuation switch is turned on, so that the rectify
electricity output by the
rectifier module is connected into the
power load, and at this time, the dynamic load of the mud generator instantaneously increases the rotational speed of the rotor is instantaneously reduced, the rotor tends to be stable, and then the
turbine blades drive the rotor to increase the rotational speed through magnetic
coupling, and in this process, the
turbine blades and the rotor tend to be synchronous.