Control circuit for parallel charging of multiple chargers

Abstract

The invention discloses a control circuit for parallel charging of multiple chargers. The control circuit comprises n chargers connected in parallel, a voltage comparison circuit, a PWM control circuit, a charging output circuit and a constant voltage sampling circuit. The negative electrode of the charger is grounded, the positive electrode of the charger is connected with the input end of the voltage comparison circuit and the voltage input end of the charging output circuit, the output end of the voltage comparison circuit is connected with the input end of the PWM control circuit, and the output end of the PWM control circuit is connected with the signal input end of the charging output circuit. The output end of the charging output circuit is connected in parallel with the constant voltage sampling circuit and then outputs voltage to the rechargeable battery. The voltage comparison circuit compares the input voltage of the charger with a set value, and when the output and input are smaller than the set value, the duty ratio of the PWM circuit is controlled to be reduced, so that the charging output voltage is reduced, the output voltage of the charger is stabilized at the set value all the time, and the output current is output according to the constant current value of each charger. Therefore, the output ports of the plurality of chargers are connected in parallel for charging.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a control circuit for parallel charging of multiple chargers. Background technique [0002] Products need to be diversified, such as energy storage power charging products, according to the different needs of different customers, for different charging speeds, charging times and usage scenarios, choose chargers. Users can purchase several chargers in the form of accessories according to their needs to quickly complete charging, and multiple chargers can be used in parallel at the same time. If there is no related control circuit and the chargers of the same specification are used directly in parallel, there will be uneven power distribution, which will damage the chargers. SUMMARY OF THE INVENTION [0003] Aiming at the problem of uneven power distribution and damage to the chargers caused by the direct parallel charging of multiple chargers in the prior art, the p...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem in the prior art that multiple chargers are directly connected in parallel to charge, the uneven power distribution will lead to damage to the chargers. The present invention proposes a control circuit for parallel charging of multiple chargers of the same specification. The n The input voltage of two parallel chargers is compared with the set value. When the input voltage is lower than the set value, the duty cycle of the PWM control circuit is reduced, so that the output voltage of the charger is always stable at the set value, and the output current according to Constant current value output of each charger to achieve the purpose of parallel charging with multiple charger output ports

Images