Electronic Load Dual Slope Circuit LED Simulation
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Solution Overview
Problem
Conventional electronic loads fail to accurately simulate the electrical characteristics of semiconductor elements, particularly LEDs, due to their inability to account for non-linear voltage and important electrical characteristics, resulting in inaccurate results that do not meet precision demands.
Innovation Solution
An electronic load apparatus utilizing two slope generating circuits with different voltage-to-current slopes to simulate the electrical characteristics of semiconductor elements, including LEDs, by generating a first slope for voltages between 0V and rated voltage and a second slope by subtracting the forward bias voltage from the output voltage when it exceeds the conducting state voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional electronic load operating at constant resistance mode is used to simulate LED, then the electronic load is simple to implement, but the simulation accuracy is poor because it cannot account for the conducting state voltage characteristic of semiconductor elements
Solution Approach 1:
The voltage range is segmented into two regions: below conducting state voltage and above conducting state voltage. Different slope generating circuits are activated for each region to accurately represent the non-linear electrical characteristics of semiconductor elements at different operating points.
Solution Approach 2:
The electronic load dynamically switches between different slope generating circuits based on the instantaneous voltage level relative to the conducting state voltage. This dynamic adaptation allows the system to maintain high simulation accuracy across the entire operating range while keeping each individual circuit relatively simple.
2Stability of the object's composition
If conventional electronic load operating at constant current mode, constant voltage mode or constant power mode is used, then the electronic load provides stable operation, but it is incapable of accurately achieving simulations of electrical characteristics of LEDs due to neglecting the conducting state voltage
Solution Approach 1:
Different operational characteristics are applied to different voltage regions. Below the conducting state voltage, one set of electrical characteristics is simulated, while above the conducting state voltage, another set of characteristics is simulated. This local differentiation enables accurate representation of the semiconductor's non-linear behavior while maintaining stable operation in each region.
3Ease of operation
If non-linear voltage is directly deducted before proceeding to resistance operating mode in conventional electronic load, then the circuit operation is simplified, but important electrical characteristics of semiconductor elements are neglected resulting in inaccurate results
Solution Approach 1:
The conducting state voltage is subtracted from the input voltage before the resistance simulation is applied. This preliminary action ensures that the resistance simulation is based on the voltage actually available to drive current through the semiconductor element, thereby maintaining both operational simplicity and simulation accuracy.
Data Source
AI summary
An electronic load for a semiconductor element is provided. The electronic load includes at least two slope generating circuits, each of which generates a current according to a current for the electronic load corresponding to an output voltage of a power supply. Each slope generating circuit comprises at least a first slope generating circuit that simulates a first slope when the output voltage of the power supply is between 0V to a rated voltage, and a second slope generating circuit that simulates a second slope when the output voltage of the power supply is higher than the conducting state voltage of the semiconductor element by subtracting the forward bias voltage from the output voltage of the power supply.