Constant current control circuit controlling charging loop current

Abstract

The invention discloses a constant current control circuit controlling a charging loop current. The constant current control circuit is small in size and can reduce energy consumption. The constant current control circuit comprises a switch tube, a switch control circuit and an induction transformer, wherein the switch control circuit is used for controlling switching on and switching off of the switch tube, one end of a primary side coil of the induction transformer is connected with the output end of the switch tube, and the other end of the primary side coil serves as the switching-in end connected with a charging loop; one end of a secondary side coil of the induction transformer is grounded, the other end of the secondary side coil is connected with the switching-in end of the primary side coil through a reverse-preventing diode, the switch control circuit is based on a PWM control chip, a current detection resistor is arranged between the grounded end and the power end of the switch tube, and the grounded end of the switch tube is connected to the feed-in end of the switch control circuit through a current feedback circuit. The constant current control circuit is mainly used in the charging loop when a lithium battery is charged by a charger.

Description

technical field [0001] The invention relates to a constant current control method, in particular to a constant current control circuit used for controlling the current of a charging circuit during the charging process of a battery by a charger. Background technique [0002] With the rapid development of science and technology and the continuous popularization of new energy sources, it has become a common technical requirement to control the current by technical means, especially in the active intervention management of lithium-ion battery charging and the limitation of discharge current. The traditional current control is mostly a linear circuit, and the disadvantage is that it is bulky; of course, there are also a few that use the PWM method, but because there is no feedback winding in the circuit, the energy is wasted in the MOS circuit, resulting in a waste of energy and greatly reducing the energy consumption. The conversion efficiency; at the same time, it also makes th...

AI Technical Summary

Problems solved by technology

The traditional current control is mostly a linear circuit, and the disadvantage is that it is bulky; of course, there are also a few that use the PWM method, but because there is no feedback winding in the circuit, the energy is wasted in the MOS circuit, resulting in a waste of energy and greatly reducing the energy consumption. The conversion efficiency; at the same time, it also makes the whole circuit heat relatively large, and the circuit work is unreliable

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