Voltage Boosting Circuit Modulating Duty Cycle for LCD Power Efficiency
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Solution Overview
Problem
Existing voltage boosting circuits for LCD displays consume excess power as they provide a fixed supply voltage regardless of the actual voltage required by the display panel, leading to inefficient power usage.
Innovation Solution
A voltage boosting circuit that modulates its duty cycle automatically by charging and discharging an inductor, adjusting charging and discharging times based on the power required by the load, using a control circuit to detect output current and voltage to optimize energy delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed supply voltage is provided to the operational amplifiers, then the display panel can operate reliably, but excess power is consumed when high voltage is not required
Solution Approach 1:
The patent implements dynamic voltage adjustment by switching between a first supply voltage (higher) and a second supply voltage (lower) based on the absolute value of the differential input voltage. When the absolute value exceeds a threshold, the higher voltage is applied; otherwise, the lower voltage is applied. This dynamic adaptation resolves the contradiction between maintaining reliable operation and reducing power consumption.
Solution Approach 2:
The patent changes the supply voltage parameter dynamically based on operating conditions. The control circuit monitors the differential input voltage and adjusts the supply voltage magnitude accordingly, transitioning between two discrete voltage levels. This parameter change strategy allows the system to maintain reliability when needed while minimizing power consumption during normal operation.
2Reliability
If a high supply voltage is always provided, then the display panel operates reliably under all conditions, but power consumption increases unnecessarily
Solution Approach 1:
The patent employs parameter changes by adjusting the supply voltage magnitude based on the differential input voltage threshold. The system switches between a first magnitude (higher voltage) and a second magnitude (lower voltage), ensuring reliable operation when the threshold is exceeded while avoiding energy waste during normal operating conditions.
Solution Approach 2:
The control circuit dynamically adjusts the supply voltage magnitude in response to changing input conditions. By monitoring the absolute value of the differential input voltage and switching between two voltage magnitudes, the system maintains operational stability only when necessary, thereby reducing energy waste during stable operating periods.
3Device complexity
If the duty cycle is fixed, then the voltage boosting circuit operates simply, but it cannot adapt to varying power requirements of the display panel
Solution Approach 1:
The patent implements feedback control by monitoring the differential input voltage and using this information to adjust the supply voltage magnitude. The control circuit continuously compares the absolute value of the differential input voltage against a threshold and adjusts the supply voltage accordingly, enabling the system to adapt to varying power requirements while maintaining operational reliability.
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 approach reduces power consumption by ensuring that only the necessary power is delivered to the display panel, thereby saving energy and improving efficiency.
Implementation Method 1
an inductor L, a switching module, and a control circuit. The inductor L has a first terminal and a second terminal. The first terminal of the inductor L is coupled to an input for receiving an input power VDD. The switching module is coupled among a second terminal of the inductor L, a ground GND, and an output of the voltage boosting circuit 26
Data Source
AI summary
The present invention relates to a voltage boosting circuit capable of modulating duty cycle automatically, which comprises an inductor, a switching module, and a control circuit. The inductor is coupled to an input for receiving an input power. The switching module is coupled among the inductor, a ground, and an output for switching so that the input power can charge the inductor and produce charged energy, or for switching so that the charged energy of the inductor can discharge to the output and produce an output voltage. The control circuit outputs at least a control signal according to the charged energy and the output voltage for controlling the switching module to switch the inductor and provide the input power to the output, to switch the charged energy of the inductor to discharge to the output, or to switch the input power to charge the inductor.