VPP Pumping Circuit Segmentation for Voltage Efficiency
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Solution Overview
Problem
Conventional high voltage VPP pumping circuits either prioritize efficiency with a doubler structure or reliability with a tripler structure, but fail to satisfy both simultaneously.
Innovation Solution
A high voltage VPP pumping circuit and method that utilizes a tripler pump to initialize and pump the voltage to a predetermined level, followed by a doubler pump, with control signals and logic units to manage the pumping process, ensuring both reliability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a doubler structure high voltage VPP pump is used, then pumping efficiency is improved (maximum 50%), but reliability deteriorates because it can only pump voltage to twice the external voltage level
Solution Approach 1:
The high voltage VPP pumping circuit is divided into two separate pumping stages: a first high voltage VPP pump (tripler structure) that pumps voltage from external voltage level to three times external voltage, and a second high voltage VPP pump (doubler structure) that further pumps from three times to five times external voltage. This segmentation allows each pump to operate optimally within its voltage range, achieving both high efficiency and reliability.
Solution Approach 2:
The circuit dynamically switches between the first and second high voltage VPP pumps based on the current voltage level. Control logic enables the tripler pump to operate when voltage is below three times external voltage, and switches to the doubler pump when voltage reaches that level, optimizing efficiency at each stage while ensuring reliable voltage escalation to the final required level.
2Reliability
If a tripler structure high voltage VPP pump is used, then reliability is improved (can pump to three times external voltage), but pumping efficiency deteriorates (maximum 33% efficiency)
Solution Approach 1:
The pumping process is segmented into two phases: Phase 1 uses the tripler structure pump to efficiently reach three times external voltage (achieving 33% efficiency for this stage), and Phase 2 uses the doubler structure pump to reach the final five times voltage level (achieving 50% efficiency for this stage). The overall system efficiency is optimized by matching pump structure to voltage range requirements.
Solution Approach 2:
The control logic dynamically selects which pump to operate based on the current voltage level. When voltage is below three times external voltage, the tripler pump operates. When voltage reaches three times external voltage, the system switches to the doubler pump, thereby dynamically optimizing efficiency across the entire voltage pumping range while maintaining reliability.
3Use of energy by moving object
If both tripler and doubler pumps are used in sequence, then both reliability and efficiency are satisfied, but device complexity increases
Solution Approach 1:
The first high voltage VPP pump (tripler) and second high voltage VPP pump (doubler) are merged into a single integrated pumping circuit system with shared control logic and voltage sensing mechanisms. This combination achieves the dual benefit of reliability and efficiency while minimizing the increase in device complexity through unified design and shared components.
Solution Approach 2:
The control logic unit serves multiple functions: it monitors the high voltage VPP level, determines which pump should operate, switches between pump configurations, and manages the overall pumping sequence. This multi-functionality reduces the need for separate control circuits for each pump, thereby limiting the increase in device complexity despite the dual-pump architecture.
Data Source
AI summary
Disclosed are a high voltage pumping circuit and a VPP pumping method using the same. The high voltage pumping circuit includes an initializing unit for initializing a high voltage in response to a first enable signal, a first pump for pumping the high voltage in response to the first enable signal, a second pump for pumping the high voltage in response to a second enable signal and a first mode signal, and a mode signal transmitting unit for generating a second mode signal in response to the second enable signal and the first mode signal. The driving of the initializing unit and the first pump is controlled in response to the first pump and the second mode signal.