Flyback type multi-level output direct current power supply for quick tracking reference

The invention provides a flyback type multi-level output direct current power supply for quick tracking reference. The power supply can be used for occasions where power supply voltage requires to be changed, for example, power supplies of a radio frequency power amplifier and a sound power amplifier can effectively improve power of the power amplifiers and reduce consumption. The direct current power supply increases auxiliary side winding number on the base of a flyback type switch power supply, connects outputs of each auxiliary side in series, and is matched with control of an auxiliary side output switch tube to achieve variation of output levels. Connection and disconnection of the auxiliary side output switch tube are controlled by input reference, so that the output levels can track input reference signals. Two-stage control strategy of the primary side switch tube control and the auxiliary side switch tube control are adopted in control, system response speed is increased, and anti-jamming capability is improved.