Voltage Conversion Circuit for LCD Driving Chip Efficiency
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Solution Overview
Problem
The existing power conversion efficiency in liquid crystal display (LCD) modules is low due to the limited voltage conversion capabilities of integrated charge pumps and low dropout regulators, which can only switch between a few fixed voltage magnification modes, restricting the use time of portable intelligent terminals like smartphones.
Innovation Solution
A voltage conversion circuit and liquid crystal display driving chip that utilize a voltage conversion module and control module with multiple capacitors and switches to achieve various output voltage magnifications by controlling the charging and discharging of capacitors, enhancing power conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If integrated charge pump is used for voltage conversion, then voltage conversion function is provided, but power conversion efficiency becomes very low
Solution Approach 1:
The voltage conversion circuit is divided into multiple operational modes (first voltage conversion mode, second voltage conversion mode, third voltage conversion mode) with different switch configurations. Each mode is optimized for specific voltage conversion ratios, allowing the system to segment the conversion process into efficient stages rather than using a single inefficient charge pump structure
Solution Approach 2:
The circuit dynamically switches between different operational modes based on the required output voltage. The control module adjusts the switching states of multiple switches (S1-S13) to change the circuit configuration in real-time, enabling adaptive voltage conversion that maintains high efficiency across different operating conditions
2Adaptability or versatility
If charge pump switches between fixed modes, then voltage conversion is achieved, but adaptability to complex voltage requirements is limited
Solution Approach 1:
The voltage conversion circuit is designed with multiple switches and capacitors that can be configured in different combinations to achieve various voltage conversion ratios. The same circuit structure serves multiple functions by changing switch states, providing universal adaptability to different voltage requirements without needing separate dedicated circuits for each conversion ratio
Solution Approach 2:
The circuit changes its operational parameters (switching configurations, active components) based on the required output voltage. By adjusting which switches are closed and which capacitors are charged/discharged, the circuit adapts its conversion ratio dynamically, maintaining high efficiency while meeting diverse voltage demands
3Loss of energy
If multiple switches and capacitors are added for voltage conversion, then power conversion efficiency is improved, but device complexity increases
Solution Approach 1:
Multiple functional components (switches, capacitors, voltage conversion paths) are merged into a single integrated circuit structure. The first capacitor, second capacitor, third capacitor, and fourth capacitor are combined with switches S1-S13 in a unified architecture that performs multiple voltage conversion functions simultaneously, reducing the need for separate discrete components
Solution Approach 2:
The circuit components serve multiple purposes: capacitors are charged and discharged in different sequences for different conversion modes, switches are reused across multiple conversion paths, and the same physical structure enables three distinct voltage conversion modes. This multi-functionality reduces overall component count compared to implementing separate conversion circuits for each mode
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 significantly improves power conversion efficiency by allowing multiple output voltage magnifications, thereby extending the use time of portable intelligent terminals by optimizing the voltage conversion process.
Implementation Method 1
the voltage conversion module is used to convert the voltage of the input power to different magnifications output voltage and output from the output terminal when the first capacitor, the second capacitor, the third capacitor and the fourth capacitor are charging and discharging
Data Source
AI summary
The embodiment of the present disclosure provides a voltage conversion circuit including a voltage conversion module and a control module, the voltage conversion module includes a input terminal, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first switch to thirteenth switch and a output terminal, the input terminal is used to connect the input power, the control module is connected with the voltage conversion module, the voltage conversion module is used to convert the voltage of the input power to different magnifications output voltage and output from the output terminal when the first capacitor, the second capacitor, the third capacitor and the fourth capacitor are charging and discharging. Further, the embodiment of the present disclosure further provides a liquid crystal display driving chip applied the voltage conversion circuit. The voltage conversion circuit may achieve multi-magnification voltage output, and improve the conversion efficiency of the voltage.