Electronic Load Device Dynamic Bandwidth Regulation
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Solution Overview
Problem
Existing electronic load devices have a fixed and finite bandwidth, which is incompatible with the variable output impedance of power supply products, leading to unstable testing systems and potential malfunctions or device burn-down during high-current testing.
Innovation Solution
An electronic load device with a CPU, impedance-bandwidth table, voltage-current measurement unit, and control module that adjusts its working bandwidth based on the output impedance of the power supply product, using a power stage with power transistors to simulate a load and regulate bandwidth through a mapping table.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed bandwidth range is used in the electronic load device, then the device structure is simple, but the device cannot adapt to different output impedance of power supply products and may cause unstable testing or device burn-down
Solution Approach 1:
The electronic load device dynamically adjusts its bandwidth according to the output impedance of the power supply product being tested. The control module receives impedance information and automatically regulates the bandwidth parameter, transforming the fixed bandwidth system into a dynamic one that adapts to different testing conditions, thereby resolving the contradiction between adaptability and structural simplicity
Solution Approach 2:
The invention changes the bandwidth parameter of the electronic load device based on the measured or inputted output impedance of the power supply product. By adjusting this key parameter dynamically, the system achieves adaptability to different impedance values without requiring complete structural redesign, thus balancing adaptability improvement with acceptable device complexity
2Reliability
If the electronic load device uses a fixed bandwidth, then the device is easy to manufacture, but the response time is incompatible with the real load and may cause testing malfunctions
Solution Approach 1:
The electronic load device incorporates a feedback mechanism where the control module continuously monitors the output impedance of the power supply product and adjusts the bandwidth parameter accordingly. This closed-loop feedback system ensures stable and reliable testing by automatically adapting to impedance variations, while the automated control reduces manual intervention requirements and maintains reasonable manufacturing ease
Solution Approach 2:
The device performs preliminary measurement or input of the output impedance before conducting the actual power testing. By determining the appropriate bandwidth setting in advance based on the impedance characteristics, the system ensures optimal and stable testing conditions from the start, preventing testing malfunctions while maintaining a straightforward manufacturing process
Data Source
AI summary
An electronic load device provided for testing an OT (power supply to be tested) and the working bandwidth is regulated and set according to the output impedance of the OT. The electronic load device comprises a CPU, an impedance-bandwidth table, a voltage-current measurement unit, a power stage and a control module. Firstly, a current pulled out from the OT to the power stage is called by the CPU. Thereafter, an output impedance of the OT is measured by the voltage-current measurement unit and analysis by the CPU. Next, a working bandwidth of the electronic load device is regulated and set by the control module according to the output impedance and the impedance-bandwidth table.