Multi-Stage Charge Pump Circuit with External Stabilizing Capacitor
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Solution Overview
Problem
Current power circuits with multiple stages of charge pumps are inefficient in supplying large transient currents and maintaining stable output voltages, particularly in high-resolution liquid crystal display devices, due to limitations in each stage's efficiency, leading to insufficient power supply for driving chips and instability in voltage levels.
Innovation Solution
A power circuit design that includes an external voltage stabilizing capacitor and an output capacitor, along with a timing controller and level detecting unit, to manage the switching frequency and multiple of charge pumps, ensuring stable voltage and current supply to the loading, even during heavy transient conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If multiple stages of charge pumps are connected in series to generate higher voltage levels, then the output voltage is improved, but the efficiency of multiplying voltages becomes insufficient and the ability to supply large transient currents is lost
Solution Approach 1:
The patent introduces a preliminary action by adding a voltage stabilizing capacitor at the output of the charge pumps before the final voltage multiplication stage. This capacitor pre-stores energy and stabilizes the intermediate voltage, enabling the system to quickly respond to transient current demands without compromising the efficiency of the voltage multiplication process across multiple stages
2Productivity
If the switching frequency of charge pumps is increased to supply large transient currents, then the current supply capability is improved, but the power consumption increases
Solution Approach 1:
The patent implements a dynamic control mechanism that adjusts the switching frequency of charge pumps based on the actual transient current requirements of the loading. During heavy transient conditions, the frequency is increased to supply sufficient current; during normal operation, the frequency is reduced to minimize power consumption. This dynamic adaptation resolves the contradiction between current supply capability and energy efficiency
3Stress or pressure
If the number of charge pump stages is increased to achieve higher voltages, then the voltage level is improved, but the stability of output voltage deteriorates
Solution Approach 1:
The patent incorporates a feedback mechanism through level detecting units that continuously monitor the output voltage of each charge pump stage. Based on these detection results, the system dynamically adjusts the switching frequency and operation of subsequent stages to maintain stable output voltage levels, even when multiple stages are connected in series to achieve high voltage multiplication
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 effectively supplies large transient currents and maintains stable voltage levels, enhancing the power circuit's ability to support high-resolution displays by optimizing the switching frequency and multiple of charge pumps, thereby reducing power consumption and improving overall performance.
Implementation Method 1
The voltage stabilizing capacitor is coupled between the first and second charge pumps and connected externally to the output of the first charge pump. When the loading is changed to a heavy loading instantaneously, the charges output by the voltage stabilizing capacitor increase for supplying the first output voltage to the second charge pump.
Implementation Method 2
charge pumps are disposed for using existing voltages to generate different voltage levels
Data Source
AI summary
The present invention discloses a power circuit having multiple stages of charge pumps. The power circuit comprises a first charge pump, a second charge pump, a voltage stabilizing capacitor, and an output capacitor. The first charge pump adjusts an input voltage and produces a first output voltage. The second charge pump adjusts the first output voltage, produces a second output voltage, and outputs the second output voltage for driving a loading. The voltage stabilizing capacitor is coupled between the first and second charge pumps and connected externally to the output of the first charge pump. The output capacitor is coupled to the second charge pump for providing the second output voltage. According to the present invention, the effect of supplying large transient currents to the loading can be achieved by connecting externally the voltage stabilizing capacitor to the output of the first charge pump.