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A power supply apparatus and a power supply method are described, wherein the non-polar characteristics of the electrodes of a capacitor is utilized to improve the energy utilization efficiency of a battery through reciprocating switches of polarity connection between the battery and the capacitor.

A power supply apparatus and a power supply method are described, wherein the non-polar characteristics of the electrodes of a capacitor is utilized to improve the energy utilization efficiency of a battery through reciprocating switches of polarity connection between the battery and the capacitor. The voltages of the capacitors can also stay at a near constant level using the polarity reversal mechanism.

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What is claimed is: 1. A power supply apparatus, comprising: at least one voltage source; at least one capacitor, connected with the voltage source in series, wherein a plurality of electrodes of the capacitor are non-polar, the capacitor allows for reverse charging, an electrode polarity of the ca

What is claimed is: 1. A power supply apparatus, comprising: at least one voltage source; at least one capacitor, connected with the voltage source in series, wherein a plurality of electrodes of the capacitor are non-polar, the capacitor allows for reverse charging, an electrode polarity of the capacitor is reversed, and a supercapacitor serve as continuous load leveling to the voltage source; and at least one switching mechanism connected between the voltage source and the capacitor, capable of reciprocally switching the polarity connection between the voltage source and the capacitor. 2. The power supply apparatus of claim 1, wherein the switching mechanism is disposed at side of the voltage source. 3. The power supply apparatus of claim 2, wherein the switching mechanism comprises a double-pole double-throw (DPDT) switch. 4. The power supply apparatus of claim 1, wherein the switching mechanism is disposed at side of the capacitor. 5. The power supply apparatus of claim 4, wherein the switching mechanism comprises a double-pole double-throw (DPDT) switch. 6. The power supply apparatus of claim 1, further comprising a bypassing mechanism that is in parallel connection with a load of the power supply apparatus in a charging stage of the battery to the capacitor. 7. The power supply apparatus of claim 6, wherein the switching mechanism comprises a three-pole double-throw (TPDT) switch that also switches the bypassing mechanism. 8. The power supply apparatus of claim 1, wherein the voltage source is selected from the group consisting of primary batteries, secondary batteries, fuel cells, combustion engines, turbo-generators and utility power grid. 9. The power supply apparatus of claim 1, wherein the capacitor is selected from the group consisting of supercapacitor, ultracapacitor and electric double layer capacitor. 10. The power supply apparatus of claim 9, wherein the capacitor has a working voltage of 1.5V or above and a capacitance of 0.5 F or above. 11. The power supply apparatus of claim 1, wherein the capacitor has two electrodes for connecting to the voltage source, and the electrodes are identical in chemical composition. 12. The power supply apparatus of claim 1, wherein the switching mechanism is selected from the group consisting of mechanical switch, electromagnetic relay, field effect transistor (FET), integrated bipolar transistors (IGBTs) and intelligent integrated electronic circuit (IIEC). 13. The power supply apparatus of claim 12, wherein the switching mechanism has a switching time of 60 seconds or shorter. 14. The power supply apparatus of claim 12, wherein the intelligent integrated electronic circuit (IIEC) can sense voltage and current of the capacitor to trigger switches in the IIEC accordingly. 15. A power supply method that is applied to a power supply system including at least one voltage source and at least one capacitor wherein a plurality of electrodes of the capacitor are non-polar, the capacitor allows for reverse charging, an electrode polarity of the capacitor is reversed, and a supercapacitor serve as continuous load leveling to the voltage source, comprising: connecting the voltage source and the capacitor in series; and reciprocally switching the polarity connection between the voltage source and the capacitor by using a switching mechanism connected between the voltage source and the capacitor. 16. The power supply method of claim 15, wherein the switching of the polarity connection is performed every time a combined voltage of the voltage source and the capacitor is substantially zero. 17. The power supply method of claim 15, wherein the step of reciprocally switching the polarity connection comprising: changing the polarity connection state between the voltage source and the switching mechanism. 18. The power supply method of claim 17, wherein the switching mechanism comprises a double-pole double-throw (DPDT) switch. 19. The power supply method of claim 15, wherein the step of reciprocally switching the polarity connection comprising: changing the polarity connection state between the capacitor and the switching mechanism. 20. The power supply method of claim 19, wherein the switching mechanism comprises a double-pole double-throw (DPDT) switch. 21. The power supply method of claim 15, further comprising: using a bypassing mechanism to bypass a load of the power supply system in a charging stage of the capacitor. 22. The power supply method of claim 21, wherein the switching mechanism comprises a three-pole double-throw (TPDT) switch that also switches the bypassing mechanism. 23. The power supply method of claim 15, wherein die switching mechanism is selected from the group consisting of mechanical switch, electromagnetic relay, field effect transistor (FET), integrated bipolar transistors (IGBTs) and intelligent integrated electronic circuit (IIEC). 24. The power supply method of claim 23, wherein the intelligent integrated electronic circuit (IIEC) senses voltage and current of the capacitor to trigger switches in the IIEC accordingly.