Charging system based on secondary control and secondary control device thereof

Abstract

The invention discloses a charging system based on secondary control, which comprises a transformer, a rectifier device, a secondary rectifier switch transistor, a secondary synchronous rectifier auxiliary chip, a primary control chip and a primary switch transistor, wherein the secondary synchronous rectifier auxiliary chip controls opening and closing of the secondary rectifier switch transistor, the secondary rectifier switch transistor is controlled according to a received transmission signal of a charging interface to regulate an abrupt voltage generated at two ends of a secondary winding, and the regulated abrupt voltage is fed back to an auxiliary winding to generate an output voltage switching signal; the primary control chip acquires the output voltage switching signal and then generates a gating signal, and according to the gating signal, the voltage detected by the voltage detection end and the feedback voltage of the voltage feedback end, the primary switch transistor is controlled to regulate the output voltage and the output current of the system. According to the charging system of the invention, the charging output specifications can intelligently change according to a load. The invention also discloses a secondary control device for the charging system based on secondary control.

Description

Technical field [0001] The present invention relates to the technical field of chargers, in particular to a charging system based on secondary control and a secondary control device of a charging system based on secondary control. Background technique [0002] With the development of science and technology, various electronic products can be seen at any time in people's daily life and become indispensable things in life. However, how to charge these electronic products has become a matter of increasing concern in the industry. However, different electronic products have different charging specifications, some require 5V, and some require 9V and 12V. [0003] Such as figure 1 As shown, the current mainstream solution is to obtain the transmission signal from the terminal through the D line in the USB interface and then selectively turn on the corresponding MOS tube through a decoding chip to change the ratio of the voltage divider resistance to achieve different output voltages. [0...

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Problems solved by technology

[0004] However, the disadvantages of this scheme are: 1. Several MOS transistors are required to change different output voltages, and the secondary control scheme needs to cooperate with optocoupler and controllable device TL431, and the overall cost is relatively high; 2. The only change is The output voltage and output current do not change accordingly, which will cause the phenomenon that the low-power load is charged with a large current, which will affect the life of the battery at the load terminal

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