Power supply device with efficient charge function and controllable voltages for series supercapacitors

Abstract

The invention discloses a power supply device with an efficient charge function and controllable voltages for series supercapacitors. The power supply device comprises light-control current direction switches, the supercapacitors, a charge terminal, a charge diode, a charge ground diode, a charge ground terminal, a high-potential power leading-out terminal, AD (analog-digital) sampling divider resistors, a power supply terminal, a power supply ground terminal and a single chip microcomputer module. The power supply device has the advantages that output voltage set values of users can be received by a single chip microcomputer serial port, the highest voltages of the first-stage supercapacitor, the lowest voltages of the last-stage supercapacitor, power supply voltages and charge voltages are acquired, rated voltages of the supercapacitors are compared to the output voltage set values of the users, accordingly, the corresponding light-control current direction switches can be selected and controlled, supercapacitor charge procedures and power supply procedures can be carried out, and the purposes of efficiently charging the supercapacitors and supplying power with the controllable voltages can be achieved.

Description

technical field [0001] The invention relates to a charging and power supply device, in particular to a high-efficiency charging and controllable voltage power supply device for supercapacitors connected in series. Background technique [0002] There is a problem of half energy loss in the case of constant voltage charging of capacitors, that is, the charging efficiency is only 50% at most, and half of the energy is consumed on the current limiting resistor or radiated in the form of electromagnetic waves. With the widespread application of supercapacitors and the substantial increase in the capacity of supercapacitors, the loss of this part of energy has been considerable. On the other hand, a single supercapacitor or a combination of supercapacitors with a fixed internal connection can only supply power to the lowest voltage that the load can withstand, while a supercapacitor can supply power to close to 0V, which is different from a battery, so the supercapacitor stores A...

AI Technical Summary

Problems solved by technology

On the other hand, a single supercapacitor or a combination of supercapacitors with a fixed internal connection can only supply power to the lowest voltage that the load can withstand, while a supercapacitor can supply power to close to 0V, which is different from a battery, so the supercapacitor stores A considerable part of the energy cannot be effectively utilized. For example, when the minimum voltage required for a 5.5V 4.0F supercapacitor to power a 5V microcontroller is 4.7V, its theoretical power supply efficiency is only (5.5 2 -4.7 2 ) / 5.5 2 <27%, for this reason, improving the charging efficiency and power supply efficiency of supercapacitors is an urgent problem to be solved

Images