Dual Charge Pump Circuit for Negative Voltage Generation
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Solution Overview
Problem
Negative voltage charge pumps consume excessive power during initial operation due to high current loading, and prolonged initial loading times occur during normal operation when current loading is reduced.
Innovation Solution
A negative voltage circuit comprising a first charge pump circuit for start-up mode operating with a higher current and speed, transitioning to a second charge pump circuit for normal operation with a lower current and speed, utilizing a power switch and signal switch circuit to manage power supply and driving signals, and an operating mode control circuit to switch between modes based on output voltage thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the negative voltage charge pump is set to appropriate more current loading in the early stage, then the target voltage is reached more rapidly, but a considerable amount of power is consumed during the operation of the charge pump
Solution Approach 1:
The patent applies dynamics by making the current loading adjustable based on operating conditions. The control circuit dynamically switches between first current loading (higher current) during start-up mode and second current loading (lower current) during normal operation mode, allowing the system to adapt its power consumption and speed characteristics to the current operational phase
Solution Approach 2:
The patent segments the operation into two distinct modes: start-up mode and normal operation mode. Each mode uses different current loading parameters - the first charge pump circuit uses higher current for rapid voltage establishment, while the second charge pump circuit uses lower current for efficient maintenance, thereby resolving the contradiction between fast start-up and low power consumption
2Use of energy by moving object
If the negative voltage charge pump is set to appropriate less current loading during normal operation, then power consumption is reduced, but initial loading time increases
Solution Approach 1:
The patent applies preliminary action by using the first charge pump circuit with higher current loading to rapidly establish the target voltage during start-up mode before transitioning to the second charge pump circuit. This preliminary high-current phase ensures that the voltage is established quickly, avoiding time loss, while the subsequent normal operation uses lower current for efficient power consumption
3Speed
If the size of the inverter and capacitance of the charging capacitor are enlarged, then the target voltage is reached more rapidly and high currents are loaded, but power consumption increases during operation
Solution Approach 1:
The patent makes the current loading dynamic by switching between two charge pump circuits with different current capabilities. The first charge pump circuit is designed for high current during start-up to rapidly establish voltage, while the second charge pump circuit operates at lower current during normal operation, thereby achieving fast voltage establishment without sustained high power consumption
Solution Approach 2:
The patent changes the operating parameters (current loading) based on the operational phase. By transitioning from first current loading (higher current) in start-up mode to second current loading (lower current) in normal operation mode, the system achieves rapid voltage establishment initially while maintaining efficient power consumption during sustained operation
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 reduces power consumption in normal operating mode while ensuring rapid start-up, allowing for efficient generation and stabilization of negative voltage across the circuit.
Implementation Method 1
a first charge pump circuit configured to operate in a start-up mode and perform a first charge pumping operation based on a first current to generate a negative voltage
Implementation Method 2
The first output capacitor may be connected between a first output node of the first charge pump circuit and a ground to stabilize a negative voltage at the first output node
Data Source
AI summary
A negative voltage circuit includes a first charge pump circuit and a second charge pump circuit. The first charge pump circuit is configured to operate in a start-up mode and perform a first charge pumping operation based on a first current to generate a negative voltage. The second charge pump circuit is configured to operate in a normal operating mode subsequent to the start-up mode and perform a second charge pumping operation based on a second current to generate a negative voltage, The first current is higher than the second current, and a speed of the first charge pumping operation is higher than a speed of the second charge pumping operation.