Charge Pump Voltage Boosting for Display Driving Current
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Solution Overview
Problem
Charge pumps used in semiconductor integrated circuits and display driving systems face challenges in maintaining a high driving current and efficiency, particularly when generating boosted voltages for mobile devices, as they often suffer from current consumption issues that decrease output voltage.
Innovation Solution
A charge pump design with a first and second converting unit that alternately outputs pumping voltages in response to different clock signals, ensuring the second pumping voltage is provided to an output terminal for at least half of each clock signal period, enhancing current driving capability and maintaining a stable boosted voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a charge pump generates a boosted voltage using a capacitor and clock signal, then the output voltage is increased, but current consumption increases causing output voltage to decrease
Solution Approach 1:
The charge pump is divided into multiple converting units (first converting unit, second converting unit, third converting unit) that operate in parallel. Each unit has its own capacitor and clock signal phase, allowing the total pumping current to be distributed across multiple paths. This segmentation reduces the current consumption burden on any single unit and improves output voltage stability under load.
2Power
If a charge pump uses a single converting unit with capacitor and clock signal, then the structure is simple, but the current driving capability is insufficient
Solution Approach 1:
Multiple converting units are merged into a single charge pump system, where each unit contributes to the total pumping current. The units share common input and output terminals and are coordinated through phase-shifted clock signals. This merging approach increases current driving capability while keeping the overall structure relatively compact and integrated.
Solution Approach 2:
Each converting unit operates with a specific clock signal phase (first phase, second phase, third phase) that are periodic and shifted relative to each other. This periodic operation with phase differences ensures continuous charging of the output capacitor throughout the clock cycle, maximizing current delivery capability without requiring all units to operate simultaneously at full power.
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 design improves the current driving capability and power efficiency of charge pumps, enabling them to consistently supply a boosted voltage to semiconductor integrated circuits and display driving systems, even under increased current consumption.
Implementation Method 1
Charge pumps are boosting devices that use capacitors and perform based on the law of conversation of electric charge.
Implementation Method 2
Charge pumps are boosting devices that use capacitors and perform based on the law of conversation of electric charge.
Data Source
AI summary
Provided is a boosting voltage generating element used in a semiconductor integrated circuit, more particularly, is a charge pump. The charge pump includes a first converting unit and a second converting unit. The first converting unit is configured to receive a first voltage in response to a first clock signal to generate a first pumping voltage. The first converting unit is also configured to alternately output the first pumping voltage to a first terminal and a second terminal. The second converting unit is configured to receive the first pumping voltage through the first terminal or the second terminal in response to a second clock signal and a third clock signal respectively, to generate a second pumping voltage The second converting unit is also configured to provide the second pumping voltage to an output terminal. The second converting unit is configured to provide the second pumping voltage to the output terminal for at least half of a period of the second clock signal or the third clock signal.