Hysteresis comparison control method

Abstract

The invention discloses a hysteresis comparison control method, which comprises the following steps of detecting the current value I of a circuit to be tested; judging whether current is at an ascent stage or a decline stage; if the current is at the ascent stage, carrying out an ascent current adjustment step; and if the current is at the decline stage, carrying out a decline current adjustment step. The ascent current adjustment step comprises: comparing the detected current value I with the lower limit threshold value I1 of a directive current Iref, if the current value I is less than the lower limit threshold value I1, ascending the current, and if the current value I is larger than or equal to the lower limit threshold value I1, declining the current; and the decline current adjustment step comprises: comparing the detected current value I with an upper limit threshold value Ih, if the current value I is less than the upper limit threshold value Ih, ascending the current, and if the current value I is larger than or equal to the upper limit threshold value Ih, declining the current. According to the method, through reducing the width of a hysteresis loop, filtering amplitude is reduced, filtering cost is reduced, and loss caused by filtering is greatly reduced.

Description

technical field [0001] The invention relates to a hysteresis comparison control method. Background technique [0002] Nowadays, most hardware conditioning circuits have filter circuits to prevent external noise from interfering with the sampling of the device. Such hardware circuits will inevitably bring hardware delays, and the narrower the passband width, the longer the hardware delay will be. (Although the better the effect). In addition, due to the AD sampling frequency and the conversion time of the AD converter, a certain delay will inevitably be brought. In this way, the hardware circuit delay and the AD sampler conversion delay will inevitably fail to collect the instantaneous value at that time, but only the value at the previous moment. When using the hysteresis loop comparison method, the hysteresis loop width will be too large , hardware filtering is more difficult, and the loss caused by filtering will inevitably be greater. [0003] The principle of the curr...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a hysteresis comparison control method to effectively solve the problem of increased hysteresis width due to sampling delay

[0008] Utilizing the hysteresis loop comparison control method provided by the present invention can effectively solve the problem of increased hysteresis loop width due to sampling delay

Images