Electronic Load Phase Locking for Delay-Free Current Switching
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Solution Overview
Problem
Existing electronic load devices experience delays and generate adverse effects like backfeeding and divergence when simulating power consumption in fixed current mode due to signal locking requirements, preventing timely power consumption simulation.
Innovation Solution
An electronic load device with a power module, detection module, and processor that controls load current as a first current signal synchronized with the output voltage signal, uses a phase lock loop for signal locking, and switches to a second current signal via pulse width modulation, allowing immediate power consumption simulation without delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electronic load device performs signal locking on the alternating-current voltage signal before drawing current in fixed current mode, then the power supply device is protected from backfeeding and divergence effects, but the power consumption simulation cannot be performed in time due to the delay period required for signal locking completion
Solution Approach 1:
The system performs preliminary signal locking on the alternating-current voltage signal before initiating the fixed current mode operation. The processor completes the signal locking procedure (requiring one and a half cycles of the AC voltage signal) in advance, ensuring the switching load is ready to draw current without causing backfeeding or divergence effects. This preliminary action eliminates the delay period that would otherwise prevent timely power consumption simulation.
2Productivity
If the electronic load device directly draws current from the power supply device before signal locking is completed, then the power consumption simulation can be performed in time, but it causes adverse effects such as backfeeding and divergence on the power supply device
Solution Approach 1:
The system applies preliminary anti-action by completing the signal locking procedure before allowing current draw in fixed current mode. The processor ensures that the switching load is properly synchronized with the alternating-current voltage signal (completing one and a half cycles of locking) before initiating current drawing. This preliminary protective action prevents backfeeding and divergence effects from occurring at the power supply device while still enabling timely power consumption simulation.
Data Source
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AI summary
An electronic load device (10) and an operating method thereof are provided. The operating method for the electronic load device (10) includes operating a power module (30) to control a load current drawn from a device under test (20) as a first current signal according to a resistance parameter and an output voltage signal (V s) detected from the device under test (20), where the initial phase of the first current signal is the same as the initial phase of the output voltage signal (V s); inputting the output voltage signal (V s) to a phase lock loop model (51) for the signal locking; and generating a first pulse width modulation signal according to the received current parameter when the signal locking is completed, so that a switching load (31) of the power module (30) controls the load current to switch from the first current signal to a second current signal according to the first pulse width modulation signal.