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PRACTICAL KNOWLEDGE
Electronic loads and their applications in modern power electronics testing
This article explains how an electronic load works, the measurements it performs, and its main areas of application.
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Automated testing solution for projector power supplies
According to the "IDC China Projector Market Tracking Report Q4 2020" , around 3 million home projectors were sold in China in 2020, representing an annual growth of 7.5% .
IDC predicts that the compound annual growth rate (CAGR) of the Chinese projector market will continue to exceed 15% until 2025.
The Chinese brands XGIMI, JMGO, Xiaomi Group, Dangbei, and Hisense occupied the top five positions in the market. This allowed them to break the more than ten-year dominance of foreign brands in the Chinese projector market and develop numerous new technologies in the field of intelligent projection.
Recently, Tonghui Electronics developed a custom-designed TH300 automatic power supply testing system for a leading Chinese projector manufacturer.
This power supply test system enables 4-channel simultaneous testing and can test 12 different parameter groups (including numerous individual tests), including:
- Starting behavior without load at low voltage
- Ripple measurement at low voltage and full load
- Protective functions
- Efficiency
- Dynamic load tests
The system automatically generates customized data analysis reports .
The components used in the system, such as power supplies, electronic loads, and other measuring instruments, were entirely developed and manufactured by Tonghui. Based on more than 20 years of technical experience and manufacturing expertise, Tonghui offers reliable testing solutions with high quality and an efficient user experience.
Solution details
Test object:
Projector power supply / power adapter
Checkpoints:
- Start test without load at low voltage
- Ripple test at low voltage and full load
- Overcurrent protection test (testing of the tripping point)
- Short-circuit protection test
- Start test without load at high voltage
- Ripple test at high voltage and full load
- Standby power consumption
- Average efficiency
- Switch-off time check
- Dynamic load test
- Start time check
- Dynamic Ripple Test
The system uses the following components developed by Tonghui:
- High-precision electronic load TH8204T
- Multi-channel digital power meter TH3421T
- Programmable linear AC power supply TH7120T
The TH300 serves as a central control unit and enables 4-channel simultaneous testing .
The system is equipped with test software developed by Tonghui, which can be customized to meet individual customer requirements, including:
- Device configuration and debugging
- Automated testing procedures
- Editing and managing data files
- Preparation of individual test reports
List of instruments
- 1 × TH8204
- 1 × TH3421
- 1 × TH300
- 1 × TH7120
