Constant-power charging circuit, electronic equipment and system

Abstract

The invention relates to a constant-power charging circuit, an electronic device and a system, and the constant-power charging circuit is used for charging a farad capacitor, and comprises a power module which is used for providing a working voltage required by the circuit; the MCU receives the power supply power output by the power supply module and the charging voltage sampled on the farad capacitor, and calculates the charging current according to the power supply power and the charging voltage; the PID control module is used for controlling the charging current by adopting a PID algorithm, and a PID regulation result is used as the duty ratio of PWM; the voltage generation module is used for receiving the PWM current signal corresponding to the duty ratio of PWM and generating a voltage signal; and the input end of the charging control module receives the voltage signal and controls the charging of the farad capacitor. According to the invention, constant-power charging of farad current is realized through a simple and convenient control mode; and the circuit adopts less hardware and occupies a small volume.

Description

Technical field [0001] The present invention belongs to the technical field of charging control, and more particularly to a constant power charging circuit and an electronic device. Background technique [0002] Faraday capacitors have advantages over battery failure: fast charging speed, long service life, no memory effect, high safety factor, good low temperature characteristics, etc., so that it is widely used in many electronic devices (eg, high-power speakers, Electric toy car, digital camera, etc.). [0003] When a large-power instantaneous discharge is required, the Faraday capacitor is usually powered, and the characteristics of the Faraday capacitor determine its two charging methods with constant current charging and constant power charging. For example, for a supercapacitor module of 100F, 20V, if the power supply of 20V / 10A is charged, the maximum charging current is 10A in constant current charging mode; and the charging power can be maintained at 200W in the const...

AI Technical Summary

Problems solved by technology

[0004] In the constant power control scheme of current technology, some use IR2104 half-bridge driver to form a BUCK circuit for control, but because the operating frequency of the IR2104 chip is low, the inductance used on the load side is relatively large, resulting in a very large volume. The place where the small onboard volume is required is limited

[0005] Therefore, limited by the problems of large size and inconvenient control, the current charging method on farad capacitors is more of a constant current charging method.

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