Supply method of dual-chip power circuit and dual-chip power circuit

A supply method of a dual-chip power circuit, wherein, the dual-chip power circuit comprises an inductor, a conduction element, a first chip and a second chip;

• the first chip comprises a control circuit and a supply circuit;
• the second chip comprises a first switch and a drive control circuit, and the drive control circuit is connected to a control end of the first switch;
• a low voltage end of an output end of the dual-chip power circuit is a reference ground of the control circuit of the first chip;
• a common end of the inductor and the conduction element is a reference ground of the drive control circuit of the second chip;
• the supply method comprises the following steps:
• S001:
• starting by controlling the dual-chip power circuit by the drive control circuit to operate in an open-loop state;
• S002:
• detecting whether an output voltage of the supply circuit is greater than a first threshold;
• if the output voltage of the supply circuit is less than the first threshold, returning to step S001;
• if the output voltage of the supply circuit is greater than or equal to the first threshold, proceeding to step S003;
• and
• S003:
• when the output voltage of the supply circuit is greater than or equal to the first threshold, supplying power to the control circuit by the supply circuit, receiving an output voltage of the first chip by the drive control circuit of the second chip, and the dual-chip power circuit in a closed-loop state,
• wherein, in step S003, when the output voltage of the supply circuit is greater than the first threshold, the control circuit of the first chip sends a signal to the drive control circuit of the second chip;
• after receiving the signal, the drive control circuit begins to be controlled by the control circuit of the first chip, wherein the signal indicates an establishment of the output voltage of the supply circuit.