Boosted Level Shifting Circuit With Peak Current Limiting
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Solution Overview
Problem
Existing level shifting circuits face challenges in achieving high driving capability while maintaining low quiescent current to reduce power consumption, particularly in applications like organic electroluminescence and FLASH storage, where they struggle to efficiently convert low voltage control signals to high voltage signals without generating excessive peak currents.
Innovation Solution
The proposed level shifting circuit incorporates a boost subcircuit and phase-inverting subcircuits with current limiting circuits to manage current flow, ensuring that the maximum current does not exceed predetermined values, thereby reducing peak currents and improving driving ability while minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the level shifting circuit uses a simple structure without current limiting, then the device complexity is low, but the peak current becomes excessive causing high power consumption
Solution Approach 1:
The patent introduces a current limiting subcircuit as an intermediary component between the boost subcircuit and the phase-inverting subcircuit. This subcircuit includes current limiting transistors that act as mediators to control and limit the peak current flow, thereby reducing power consumption without requiring complete redesign of the entire level shifting circuit architecture.
Solution Approach 2:
The level shifting circuit is segmented into distinct functional subcircuits: a boost subcircuit for voltage conversion, a phase-inverting subcircuit for signal inversion, and a current limiting subcircuit for peak current control. This segmentation allows the current limiting function to be added as a modular component, managing complexity through functional decomposition.
2Loss of energy
If the level shifting circuit adds current limiting subcircuit, then the peak current is reduced, but the device complexity increases
Solution Approach 1:
The patent converts the potentially harmful excessive peak current into a controlled parameter by using the current limiting subcircuit. The current limiting transistors are designed to activate specifically when peak current occurs, transforming the harmful energy surge into a controlled current flow that can be managed and dissipated efficiently, thereby reducing overall energy loss.
3Power
If the level shifting circuit uses high voltage directly without boost subcircuit, then the device complexity is low, but the driving capability is insufficient
Solution Approach 1:
The boost subcircuit performs preliminary voltage boosting action before the signal reaches the phase-inverting subcircuit and output stage. By pre-charging the bootstrap capacitor and boosting the voltage in advance, the circuit ensures that sufficient voltage is available for high-voltage output without requiring continuous high-voltage generation, thus improving driving capability while managing complexity through staged voltage enhancement.
Data Source
AI summary
The present disclosure provides a level shifting circuit which includes a boost subcircuit and a first phase-inverting subcircuit. The boost subcircuit has a first terminal being coupled to an input terminal of the level shifting circuit, a second terminal being coupled to a first high level signal terminal, a third terminal being coupled to a low level signal terminal, a fourth terminal being coupled to a first terminal of the first phase-inverting subcircuit; the first phase-inverting subcircuit has a second terminal being coupled to the first high level signal terminal, a third terminal being coupled to the low level signal terminal, a fourth terminal being coupled to a first output terminal of the level shifting circuit, the first phase-inverting subcircuit is configured to cause the third terminal to be electrically coupled to the fourth terminal when the first terminal thereof receives a high level signal.