Abstract: Power systems of existing high-power high-performance electromagnetic detection equipments are unsatisfactory: the output voltage is instable and non-adjustable and the output electric energy is of poor quality.Aiming at this problem, the authors propose a full-bridge DC-DC converter of bridge mode.The circuit is composed of an inverter circuit, a high-frequency transformer, and a high-frequency uncontrolled rectifier.By studying the operation modes and working principles of the circuit, the research proposes to use the proportion-integration-differentiation (PID) method for compensation, and designs the model for the converter.A comparative analysis shows that the converter has favorable stability, good dynamic performance, little phase margins, and small errors.In addition, the output voltage is adjustable in a large range of 0~1 000 V.Therefore, it can be used in high-power and high-voltage applications.