Combined power supply circuit applied to ARM system

The invention provides a combined power supply circuit applied to an ARM system and belongs to the technical field of the ARM system. The circuit comprises a DC-to-DC converter which is used for simultaneously supplying powder to a central processing unit and an image processor; the DC-to-DC converter includes an input end connected to an input voltage, a control end used for controlling a high level to supply power and a low level to stop, an output end used for simultaneously providing an output voltage to the central processing unit and the image processor, a signal input end used for receiving a control single, a feedback end, and a signal conditioning end used for conditioning the control signal. The combined power supply circuit has the beneficial effects that compared with a separate power supply mode in the prior art, a power supply circuit is saved, the power consumption and system cost are reduced, the design scheme of the system is simplified, more space on a PCB (Printed Circuit Board) can be save