LED Switching Circuit Reference Voltage Precision
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Solution Overview
Problem
Conventional LED circuit switching circuits face challenges in maintaining precision of the reference voltage due to its small output voltage, which is easily affected by measurement devices, leading to errors and difficulty in ensuring linearity.
Innovation Solution
A switching circuit with a mode-selecting circuit, comparator, and control module that includes a voltage-dividing module and a switch, allowing for precise measurement and adjustment of the reference voltage during the measuring mode and generation of a working voltage for the comparator input during the working mode, ensuring accurate comparison and control of the LED circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a feedback mechanism is used to lock the output voltage at a small pre-determined value to reduce power dissipation, then power dissipation is reduced, but measurement precision deteriorates because the small output voltage is easily affected by measuring devices
Solution Approach 1:
The patent implements a dynamic switching mechanism that alternates between measuring mode and working mode. During measuring mode, the switch connects the reference voltage to the comparator input for accurate measurement. During working mode, the switch connects the divided voltage to the comparator input for normal operation. This dynamic switching resolves the contradiction by separating measurement and operation in time, allowing precise reference voltage measurement without affecting power dissipation during working mode.
Solution Approach 2:
The patent introduces a voltage dividing module as an intermediary between the reference voltage source and the comparator input. The voltage dividing module divides the reference voltage by a predetermined ratio to generate a divided voltage. This intermediary allows the comparator to work with a larger, more easily measurable voltage during measurement mode while maintaining the small output voltage requirement during working mode, thus resolving the measurement precision issue without sacrificing power efficiency.
2Stability of the object's composition
If the output voltage is kept at a small pre-determined value to match the reference voltage, then linearity is maintained, but power dissipation increases
Solution Approach 1:
The patent employs periodic switching between measuring mode and working mode. During working mode, the system operates with the small output voltage to maintain linearity. During measuring mode, the system temporarily switches to use the divided voltage for measurement purposes. This periodic action allows the system to maintain linearity during operation while enabling accurate measurements without continuous power dissipation associated with maintaining small output voltage.
Solution Approach 2:
The switching circuit dynamically changes its configuration based on operational requirements. The control module generates control signals that switch the state of the voltage dividing module and the switch, allowing the system to adapt between measuring mode (where linearity verification is performed) and working mode (where power dissipation is minimized). This dynamic adaptation resolves the contradiction by allowing the system to maintain linearity only when necessary for measurement while minimizing power dissipation during normal operation.
3Measurement precision
If a voltage-dividing module is introduced to divide the reference voltage, then device complexity increases, but measurement precision improves
Solution Approach 1:
The voltage dividing module serves multiple functions: it divides the reference voltage for accurate measurement during measuring mode, and it provides a scaled-down voltage for comparison during working mode. The same module is used in both modes, making it a multi-functional component. This universality justifies the added complexity by providing dual benefits: improved measurement precision and maintained operational linearity, rather than requiring separate circuits for each function.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a precision-checking mechanism that maintains linearity and accuracy, allowing for effective control of the LED circuit while minimizing power dissipation, even when using smaller voltages, thus enhancing the reliability of the LED circuit operation.
Implementation Method 1
The voltage-dividing module receives and divides a reference voltage to further generate a working voltage
Data Source
AI summary
A switching circuit adapted in an LED circuit and an LED circuit are provided. The switching circuit has a mode-selecting circuit, a comparator and a control module. The mode-selecting circuit has a voltage-dividing module and a switch. The voltage-dividing module receives and divides a reference voltage to further generate a working voltage. The switch is connected to the voltage-dividing module, wherein the switch has an output. The comparator comprises a first input connected to the switch, a second input and a comparator output. During a measuring mode, the switch transfers the reference voltage and the second input is connected to the comparator output. During a working mode, the switch transfers the working voltage, the second input of the comparator receives an output voltage of the LED circuit and the control module generates a control signal according to the voltage of the comparator output to switch the LED circuit.