Inductive energy-taking type alternating current and direct current combined power supply system and control method

The invention discloses an inductive energy-taking type alternating current and direct current combined power supply system and a control method. The combined power supply system comprises a main circuit and a power supply control and energy management system; the main circuit comprises an alternating current taking circuit, a main power supply circuit, a charging circuit, a backup power supply circuit and a supporting capacitor C1; the positive electrode end of the supporting capacitor C1 is connected with a rectification bus; the power supply control and energy management system comprises aDC-DC main controller and a rectification bus voltage sampling circuit; a rectification bus voltage can reflect an energy balance relation between the alternating current input power of an electricity-taking CT and the power consumption of a load and the power supply system; and the DC-DC main controller can judge the energy balance relation according to the rectification bus voltage, select corresponding control strategi