Charge Pump Capacitor Biasing for Longer Disabled-State Lifetime
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Solution Overview
Problem
Conventional internal voltage generation devices suffer from capacitor deterioration due to high voltage differences across their ends, reducing the lifetime of the device.
Innovation Solution
The charge pump device includes a control signal generator that maintains a reference voltage at the second end of selected capacitors when the device is in a disabled state, reducing the voltage difference and extending the capacitor's lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the charge pump device uses multiple capacitors in subsequent stages to withstand larger voltage differences, then the voltage generation capability is improved, but the capacitors deteriorate faster and device lifetime is reduced
Solution Approach 1:
The patent applies dynamic control by selectively enabling or disabling specific charge pump units based on the current voltage generation requirements. Instead of keeping all charge pump units continuously active, the system dynamically adjusts which units operate, thereby reducing the continuous stress on capacitors in subsequent stages and extending their operational lifetime while maintaining the ability to generate high voltages when needed.
Solution Approach 2:
The patent changes the operational parameters of the charge pump device by introducing a disable state where selected charge pump units are turned off. This parameter change allows the system to operate with fewer active units under normal conditions, reducing voltage stress on capacitors, while still capable of transitioning to full-power operation when high voltage generation is required.
2Stability of the object's composition
If the charge pump device operates continuously to maintain voltage output, then the voltage supply is stable, but energy consumption increases and capacitor stress accumulates
Solution Approach 1:
The patent implements periodic action by enabling charge pump units only when needed rather than continuous operation. The system periodically activates specific charge pump units based on voltage generation requirements, allowing capacitors to discharge during idle periods and recharge only when necessary. This periodic operation maintains voltage supply stability while significantly reducing overall energy consumption and capacitor stress accumulation.
Solution Approach 2:
The patent extracts or removes the continuous operation requirement by selectively disabling charge pump units. Instead of maintaining continuous power delivery from all units, the system extracts only the necessary power delivery moments, enabling charge pump units to be turned off during periods when voltage generation is not required, thereby reducing energy consumption while maintaining stability when needed.
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 effectively reduces the voltage difference across capacitor ends, thereby increasing the lifetime of the capacitors and meeting sustainability requirements for semiconductor devices.
Implementation Method 1
The charge pump device includes a plurality of charge pump units, a control signal generator, and a plurality of capacitors. The charge pump units are coupled to each other in series, and the charge pump units are configured to respectively generate a plurality of pumping voltages based on a base voltage.
Implementation Method 2
The capacitors are configured to store the pumping voltage generated by the corresponding charge pump units of each stage, so that a part of the capacitors in the subsequent stage may withstand a larger voltage difference.
Data Source
AI summary
A voltage generation device and a charge pump device are provided. The charge pump device includes a plurality of charge pump units, a control signal generator, and a plurality of capacitors. The charge pump units respectively generate a plurality of pumping voltages based on a base voltage. The control signal generator is configured to generate first to fourth control signals. First ends of the capacitors respectively receive the pumping voltages. A second end of at least one selected capacitor among the capacitors receives the third control signal or the fourth control signal. A second end of an unselected capacitor receives the first control signal or the second control signal. When the charge pump device is in a disabled state, the third control signal and the fourth control signal are maintained at a reference voltage, where the reference voltage is not less than the base voltage.