Method for detecting load current by using signal in work cycle of pulsewidth modulation controller

Abstract

The invention discloses a method for detecting a load current by the duty cycle signal of a PWM controller, comprising: providing a PWM controller to stabilize the voltage of a load; installing a PWM duty cycle sensor, where the sensor receives a duty cycle signal from the PWM controller to detect the load current; and using the detection result to dynamically regulate and control working frequency and working voltage of the road and the related radiator. The invention can real-timely detect load current variation and reduce unnecessary power consumption on the load.

Description

technical field [0001] The invention relates to a method for detecting load current, in particular to a method for detecting the load current by utilizing the duty cycle pulse waveform signal of a pulse width modulation controller. Background technique [0002] Current detection technology plays a very important role in electronic circuits, especially the part of the power circuit, because the power circuit is like the heart of the body, it must continuously supply blood to every corner of the body, just like high blood pressure is generally harmful to health Therefore, how to detect the current accurately and in real time will have a great impact on the stability and safety of the entire electronic circuit system. At present, the existing current detection method mainly uses resistance conversion technology: a low-value resistor is connected in series on the power supply path. When the current flows through this resistor, a slight voltage drop will occur. Using Ohm's law, ...

AI Technical Summary

Problems solved by technology

However, this method has the following disadvantages: 1. The accuracy of current detection will be affected by the error of the resistance component itself, the external environment (such as temperature, etc.) or other uncertain factors; 2. When the current is large, the resistance Components cause additional power consumption, which will eventually be wasted in the system as heat

However, the above-mentioned control mode about the fan has the following disadvantages: 1. The temperature of the CPU responds only after the load current changes, and the fan is controlled after the temperature change of the CPU is detected by a relevant thermal device (such as a thermistor). , there will be a delay time, so that the speed of the fan cannot respond in real time to the change of the load current

2. This fan control system is a one-stage control mode, which cannot be more efficiently switched and adjusted according to the high and low temperature changes of the load

[0005] In view of the above, it is urgent to propose a method for detecting the load current using the duty cycle signal of the PWM controller, which can detect the current change of the load current in real time and quickly, and it is mainly implemented by hardware, so it can avoid Problems caused by unstable software operation or downtime

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