Super capacitor charging control circuit

Abstract

The invention provides a super capacitor charging control circuit which comprises an input reverse connection prevention circuit, a switch control circuit, a charging constant current circuit and a charging voltage detection circuit, wherein the input reverse connection prevention circuit is connected with the switch control circuit in series; the switch control circuit is connected with the charging voltage detection circuit in series; one end of the charging constant current circuit is connected with the switch control circuit, and the other end of the charging constant current circuit is connected with an output end of the charging voltage detection circuit. The constant current action mechanism and the voltage limiting action mechanism of the super capacitor charging control circuit are decided by the inherent physical characteristics of a constant current diode and a voltage stabilizing diode and are independent of the normal operation of a single-chip microcomputer or the program thereof; the super capacitor charging control circuit does not adopt a linear direct current (DC) voltage stabilizing circuit of the common charging control circuit, thus being free from electric energy loss caused by a linear adjusting component, and realizing higher power supply efficiency.

Description

technical field [0001] The invention relates to a super capacitor charging control circuit, in particular to a capacitor charging control circuit capable of effectively limiting charging current and charging upper limit voltage. Background technique [0002] Supercapacitors have large capacity, low withstand voltage, and can be charged and discharged at high currents. They are often deployed in places where power is scarce, and are used to store energy to drive high-current, short-term loads. The energy storage application of supercapacitors usually requires constant low current charging for a long time. When the voltage reaches the designed upper limit voltage, the control circuit can automatically shut down the charging circuit and stop charging to prevent supercapacitors from being overcharged and damaged. [0003] To achieve the above control requirements, the traditional method is: the input power supply voltage first passes through a linear regulated power supply contr...

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Problems solved by technology

[0004] The above-mentioned common charging control circuit has the following problems: 1. It is highly dependent on the reliable operation of the software and hardware of the microcontroller system, the control is complicated, and the reliability is not high; 2. The hardware circuit is complicated and the cost is high; 3. The upper limit of the input power supply voltage and super capacitor design The power supply efficiency is not high when the voltage difference is large

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