A digital communication circuit for isolating switching power supply chip

Abstract

The invention discloses a digital communication circuit for an isolating switch power supply chip. The digital communication circuit comprises a load detection module, a reference signal generation module, a comparator and a decoding module, wherein the load detection module is used for detecting a load of the output end of the isolating switch power supply chip and outputting a detection signal according to the magnitude of the detected load; the reference signal generation module is used for generating a reference signal; the comparator is used for comparing the obtained detection signal with the reference signal to obtain a digital signal; the decoding module is used for decoding the digital signal to obtain a decoded signal, and the decoded signal is input into a controller in the isolating switch power supply chip; according to the decoded signal, the controller generates a control signal used for driving the working state of the isolating switch power supply chip to be changed and outputs the control signal. According to the detected load of the chip, a control instruction is actively sent to the controller of the isolating switch power supply chip, parameters and functions of the chip are changed, no extra component is needed, the implementation mode is simple, a digital communication mode is more reliable than an analogue communication mode, and false triggering is avoided effectively.

Description

technical field [0001] The invention relates to a digital communication circuit for isolating a switching power supply chip, belonging to the technical field of switching power supply circuit design. Background technique [0002] With the popularity of portable electronic devices, switching power supplies have become the main power supply solutions for such electronic devices. figure 1 A traditional isolated switching power supply chip structure is given. The main modules of the chip include: voltage feedback detection module, current feedback detection module, controller, and power ground. figure 2 A system scheme of a traditional switching power supply chip structure is given. The system mainly includes: rectifier bridge D0, filter capacitor C1, transformer TR1, power chip IC1, switch tube connected to the chip OUTPUT, and CS sampling tube connected to the switch tube. loop, the DC output stage connected to the secondary side of the transformer, the VDD power supply loop...

AI Technical Summary

Problems solved by technology

However, the output terminal of this working mode only passively feeds back the switching power supply chip, and cannot actively change the working mode or parameters of the chip.

[0003] Therefore, the existing isolated switching power supply chip cannot actively change the working mode and parameters of the chip, and cannot actively send communication signals to the switching power supply chip from the output end of the whole system, and cannot realize the adjustment of chip parameters and functions

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