Switching Voltage Boosting Circuit for LED Current Control
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Solution Overview
Problem
Existing electronic circuits for controlling current through solid state light sources, such as LEDs, face inefficiencies due to the use of series resistors, which waste power and reduce the operating time of battery-powered devices, especially as the battery voltage decreases below the LED threshold.
Innovation Solution
An electronic circuit comprising a switching voltage boosting circuit and a current regulating circuit, controlled by a feedback mechanism, to maintain a consistent current flow through the LED, thereby avoiding the inefficiencies of series resistors and ensuring operation even when the supply voltage is below the LED threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resistor is connected in series with an LED to drop the applied voltage, then the LED can operate at the desired current level, but power is dissipated in the resistor which reduces overall efficiency and battery operating time
Solution Approach 1:
The patent replaces the passive resistive voltage dropping mechanism with an active switching voltage boosting circuit that uses electronic switching elements (transistors, diodes, capacitors, inductors) to convert and regulate voltage. This substitution transforms the energy management approach from dissipative to regenerative, allowing the circuit to boost voltage when needed and maintain efficient operation across varying battery conditions.
Solution Approach 2:
The patent implements a dynamic voltage boosting circuit that actively adjusts its operation based on real-time conditions. The control circuit monitors battery voltage and LED current, dynamically switching the boosting circuit on or off, and adjusting the duty cycle of switching elements to maintain optimal LED operation. This dynamic adaptation eliminates the need for fixed resistive dropping and maximizes efficiency across the entire battery discharge cycle.
2Ease of operation
If a resistor is used to drop voltage for LED operation, then the LED current can be controlled, but the battery operating time is substantially reduced due to power waste
Solution Approach 1:
The patent replaces the passive resistive current control method with an active switching circuit that uses electronic components to regulate LED current. The control circuit dynamically adjusts the switching duty cycle to maintain precise current control while minimizing power losses, thereby extending battery operating time compared to resistive control methods.
Solution Approach 2:
The patent changes the operating parameters of the voltage control system by implementing a switching regulator that operates in pulse-width modulation (PWM) mode. By varying the duty cycle of the switching elements rather than using fixed resistance, the circuit achieves precise current control with minimal power dissipation, significantly extending battery life.
3Use of energy by moving object
If the battery voltage decreases to near the LED threshold level, then the battery is still charged, but the LED output decreases rapidly and becomes useless
Solution Approach 1:
The patent replaces the direct connection between battery and LED with a voltage boosting circuit that actively converts battery voltage to the required LED operating voltage. This substitution allows the circuit to maintain stable LED operation even when battery voltage drops below the LED threshold, extracting maximum useful energy from the battery throughout its entire discharge cycle.
Solution Approach 2:
The patent implements a dynamic voltage boosting system that actively compensates for battery voltage decay. The control circuit continuously monitors battery voltage and adjusts the switching duty cycle to maintain constant LED operating voltage, ensuring stable illumination output throughout the entire battery discharge process and preventing the rapid output degradation seen in direct connection systems.
4Adaptability or versatility
If a voltage boosting circuit employing PWM switching is used to increase battery ability to power LED, then operation is possible when battery voltage is less than LED threshold, but inefficiency caused by series resistor remains
Solution Approach 1:
The patent removes the series resistor from the circuit configuration entirely. By extracting this harmful component, the design eliminates the source of power dissipation and inefficiency that plagues conventional LED driving circuits, while maintaining the voltage boosting capability through a purely switching-based architecture.
Solution Approach 2:
The patent replaces the resistive voltage dropping element with an active switching voltage regulation system. This substitution eliminates the inherent inefficiency of resistive power dissipation while maintaining the ability to operate across a wide range of battery voltages, achieving both adaptability and energy efficiency.
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
This solution enhances the efficiency of LED operation by maintaining a consistent current flow, extending the battery life and maintaining light output, with a 10-15% improvement in efficiency compared to prior art, and allowing operation from a fully discharged battery voltage of 0.2 volts.
Implementation Method 1
a switching voltage boosting circuit for controllably increasing a supply potential
Implementation Method 2
a control circuit responsive to current flowing through the solid state light source for controlling the current regulating circuit and the switching voltage boosting circuit to control the magnitude of current flowing through the solid state light source
Data Source
AI summary
An electronic circuit comprises a switching voltage boosting circuit and a current regulating circuit for controlling current flowing through a solid state light source. A control circuit controls the current regulating circuit and the switching voltage boosting circuit to control the magnitude of current flowing through the solid state light source. An error signal produced by the control circuit for controlling the current flowing through the solid state light source may further control the switching voltage boosting circuit.