Double-full-bridge feedback type voltage compensation system

The invention aims to solve the problem of fluxgate excitation voltage attenuation caused by device loss. The invention provides a double-full-bridge feedback type voltage compensation system comprising a real-time feedback calculation part and a double-full-bridge circuit part, the feedback real-time calculation part takes collected exciting coil voltage as a feedback value, a main control chip calculates a difference value between the exciting coil voltage and system set voltage as an error, and the conduction time of each field-effect tube in the next period is calculated through a PI algorithm; and the double-full-bridge circuit receives a field-effect tube conduction time control quantity calculated by feedback, the field-effect tube is conducted and turned off at different stages tocontrol voltage at two ends of an excitation coil, and the excitation voltage is compensated to a system set voltage. The system has the characteristics of fast response, accurate compensation, high reliability and no accumul