Precise equivalent resistance generation method and system based on duty ratio modulation

By using a duty cycle modulation method, digital pulse density modulation technology, and high-speed electronic switches to generate a high-precision, continuously adjustable equivalent resistance, the problem of insufficient absolute accuracy and resolution in the existing precision resistance adjustment is solved. This achieves high-resolution and wide-range resistance adjustment, reducing system complexity and cost.

CN122268320APending Publication Date: 2026-06-23CHENGDU ROTARY FEICHI TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202610293108.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-11
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

Existing technologies cannot simultaneously achieve high absolute accuracy, high resolution, wide adjustment range, low cost, and high reliability in precision resistance regulation, especially in terms of continuous and stepless adjustment.

Method used

A duty cycle-based modulation method is adopted, which controls the connection time of the standard resistor through digital pulse density modulation (PDM) technology. Combined with high-speed electronic switches and low-pass filters, a high-precision, continuously adjustable equivalent resistance is generated. The duty cycle is calculated and compensated using a digital controller to achieve precise control of the equivalent resistance.

Benefits of technology

It achieves high resolution and continuously adjustable equivalent resistance, with sub-ppm resolution and true continuous stepless adjustment. The system has a simple structure, low cost, high reliability, and is easy to automate.

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Abstract

The invention discloses a precise equivalent resistance generation method and system based on duty ratio modulation. The system comprises a main circuit and an auxiliary circuit. The main circuit comprises a test power supply, a low-pass filter, a high-speed electronic switch, a high-precision standard reference resistor and a current acquisition module which are connected in sequence; the auxiliary circuit comprises an analog-to-digital conversion module ADC, a digital controller and a digital pulse sequence generation unit which are connected in sequence, wherein the digital controller comprises a calibration and compensation module; the digital pulse sequence generation unit is connected with the high-speed electronic switch; the analog-to-digital conversion module ADC is connected with the current acquisition module; the current acquisition module is connected with the test power supply. According to the invention, the equivalent resistance with continuous and stepless resistance, adjustable high resolution, high absolute precision and excellent temperature stability can be generated.
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