Voltage regulation method of power supply system containing super capacitor

Abstract

The invention relates to a voltage regulation method of a power supply system containing a super capacitor, comprising the following steps of: monitoring a combustion engine by a monitoring unit; when the monitoring unit finds that the combustion engine stops working, informing a microprocessor to control a storage battery to supply power for a super capacitor and starting to monitor the super capacitor in real time; when the monitoring unit finds that the voltage of the super capacitor is lower than a low-voltage set value, informing the microprocessor to control a lithium rechargeable battery to supply power for the super capacitor; if the step 2 is repeatedly operated until the first set time, controlling the lithium rechargeable battery by the microprocessor to reduce the volume of the power supplied for the super capacitor to the volume enabling the voltage of the super capacitor to reach a first set voltage being smaller than the actual working voltage, wherein the first set voltage is bigger than the low-voltage set value; and if the step that the microprocessor controls the volume of the power supplied for the super capacitor by the lithium rechargeable battery to be reduced is operated until the second set time, controlling the lithium rechargeable battery by the microprocessor to stop supplying power for the super capacitor.

Description

technical field [0001] The present invention relates to a voltage regulation method of a power supply system, in particular to a voltage regulation method of a power supply system including a super capacitor. Background technique [0002] With the continuous development of technology, the application of supercapacitors is becoming more and more extensive. Such supercapacitors are different from conventional capacitors: they have a high energy density of typically 3 to 10 Wh / kg, high reusability and high mechanical strength. In particular, in the field of electric vehicles and hybrid electric vehicles, the use of supercapacitors, which are mainly used for short-term energy storage in electric vehicles and hybrid electric vehicles, has become a routine choice. [0003] The disadvantage of supercapacitors compared to electrochemical energy storage such as lead-acid batteries is the relatively low energy content, which largely determines the output voltage of supercapacitors. ...

AI Technical Summary

Problems solved by technology

However, the inventor has found through experiments that in order to maintain the voltage of the supercapacitor, using the self-contained storage battery of the hybrid electric vehicle to supply power for the supercapacitor will easily cause voltage instability

It may even generate overcurrent, causing harm to the components in the system circuit

The reason is that the battery itself also undertakes the task of supplying power to the load. Although in practice, the loads supplied by the battery are mostly loads with low dynamic loads, fluctuations will inevitably occur.

And this kind of fluctuation may cause the voltage of the supercapacitor to be kept in an appropriate range when the car is in standby.

Moreover, if the voltage of the supercapacitor is kept within a voltage range lower than the working voltage, it will have a great impact on the working efficiency of the supercapacitor after the car is started.

And the inventor found through experiments that "keeping the voltage of the supercapacitor within a voltage range lower than the working voltage" is obviously more effective than "keeping the voltage of the supercapacitor within a voltage range higher than the working voltage part of the time". It takes more charging and starting times, which is not good for the life of related components

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