Three-phase load test circuit for testing motor driver

By combining test circuits for inductive and electronic loads, the problems of unrealistic simulation and non-adjustable current magnitude in existing motor driver load tests are solved, realizing universal load testing and safety verification for motor drivers.

CN121522428AActive Publication Date: 2026-02-13GUIZHOU ZHENHUA FENGGUANG SEMICON
10 Cites 0 Cited by

Patent Information

Application Number
CN202610052642.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-15
Publication Date
2026-02-13
Estimated Expiration
2046-01-15

AI Technical Summary

Technical Problem

Existing load testing solutions for motor drives cannot realistically simulate inductive loads and cannot arbitrarily set the load current, making the tests inconvenient for general compatibility applications, especially in high-power motor drive products where effective load testing is difficult to achieve.

Method used

A solution combining inductive and electronic loads is adopted. Through a three-phase bridge driver, synchronous rectification module, electronic load, MCU controller and isolation driver, an adjustable current source mode is realized to simulate the characteristics of inductive load. It is suitable for testing motor drivers with arbitrary load current.

Benefits of technology

It enables arbitrary setting of load current, simulates the inductive characteristics of motor load, improves the convenience and safety of testing, supports universal compatibility applications of different motor drivers, and avoids the need for dedicated hardware configuration design.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention discloses a three-phase load test circuit for testing a motor driver, and the circuit comprises a three-phase bridge driver which is used for generating a three-phase AC voltage signal; the synchronous rectification module is used for synchronously rectifying the three-phase alternating-current voltage signal into a direct-current voltage signal and providing the direct-current voltage signal to an electronic load; the electronic load is used for simulating a resistive load and completing the test under the driving of the direct-current voltage signal; wherein the electronic load is set to be in a current source mode in which the magnitude of output current is adjustable; the MCU controller is used for calculating a PWM (Pulse Width Modulation) signal with a target duty ratio according to the electronic load feedback signal; the isolation driver is used for driving the three-phase bridge driver and the synchronous rectification module to work according to the PWM signal; the synchronous rectification module comprises a power inductor used for simulating an inductive load. A conventional resistive load test scheme is replaced by a scheme of combining an inductive load and an electronic load, and the method can be suitable for load verification test and aging screening test of the motor driver with any load current.
Need to check novelty before this filing date? Find Prior Art