Dual input DC-DC power converter integrating high/low voltage sources

A dual input DC—DC power converter integrating high/low voltage sources, said power converter providing an output voltage to a load end, said power converter comprising:

• an electric storage device for charging and discharging of electric energy;
• a high voltage source device whose voltage level is higher than said output voltage, a first switch being provided in said high voltage source device;
• and
• a low voltage source device whose voltage level is lower than said output voltage, a second switch being provided in said low voltage source device;
• whereby said low voltage source device and said high voltage source device are connected in series to form a power supply device, which is connected in series with said electric storage device, said power supply device forms a switching circuit of an effective power switch in different operation modes according to the on/off state of said two switches, when said power switch is on, said high voltage source device or/and said low voltage source device will charge said electric storage device, when said power switch is off, said electric storage device will release energy to said load end.