Bias Voltage Circuit for Forward Current Testing of Electronic Components
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Solution Overview
Problem
Voltage-controlled devices have limited operating ranges due to restricted programmable voltage source circuits and lack the capability to perform forward current tests, making it difficult to determine the integrity of electronic components.
Innovation Solution
The electronic device incorporates a driving circuit, an electronic component, and a bias current circuit, allowing for stable bias voltage operation over a large range and enabling forward current tests through a programmable voltage source circuit and source follower amplifier configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a programmable voltage source circuit is used to drive the voltage-controlled device, then the device can be operated with adjustable voltage, but the operating range is limited due to the restricted voltage range of the circuit
Solution Approach 1:
The voltage control is divided into two independent circuits: a first voltage control circuit for forward current testing that can apply positive voltages, and a second voltage control circuit for normal operation that can apply negative voltages. This segmentation allows each circuit to be optimized for its specific voltage range, thereby extending the overall operating range of the voltage-controlled device while maintaining voltage adjustability.
2Device complexity
If a general electronic device is used without forward current test function, then the device structure is simpler, but it cannot effectively determine whether the electronic component is damaged
Solution Approach 1:
The forward current test function is integrated into the display driver circuit, allowing damage detection to be performed preliminarily during the manufacturing or initialization phase. The first voltage control circuit applies a forward voltage to the electronic component (such as a laser diode) and measures the forward current to determine if the component is damaged before normal operation begins, ensuring reliability without significantly increasing overall device complexity.
3Device complexity
If only a single voltage control circuit is used, then the device complexity is reduced, but the operating range and stability are limited
Solution Approach 1:
The voltage control is divided into two independent circuits: a first voltage control circuit for forward current testing that can apply positive voltages, and a second voltage control circuit for normal operation that can apply negative voltages. This segmentation allows each circuit to be optimized for its specific voltage range, thereby extending the overall operating range of the voltage-controlled device while maintaining voltage adjustability.
Solution Approach 2:
A switching circuit acts as an intermediary between the control signals and the two voltage control circuits, selectively connecting the appropriate circuit based on the operational mode (forward current test or normal operation). This intermediary component enables the system to switch between different voltage ranges and functions without requiring a single complex circuit that handles all cases, thereby improving voltage stability within each operational range.
Data Source
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Figure 3A~3C
AI summary
An electronic device (100, 200, 400, 600, 800, 900) includes an electronic component (120, 220, 420, 620, 820, 920), a driving circuit (110, 210, 410, 610, 810, 910) and a circuit (130, 230, 430, 630, 830, 930). The driving circuit (110, 210, 410, 610, 810, 910) is electrically connected between a node (N1) and a first voltage (V1). The electronic component (120, 220, 420, 620, 820, 920) is electrically connected between the node (N1) and a second voltage (V2). The circuit (130, 230, 430, 630, 830, 930) is electrically connected between the node (N1) and a third voltage (V3). The first voltage (V1) is different from the second voltage (V2) and the third voltage (V3).