Negative Voltage Circuit Dual Charge Pump Start-Up Optimization
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Solution Overview
Problem
Traditional negative voltage charge pumps consume excessive power during initial operation due to high current loading, and while reducing current loading for normal operation increases initial loading time, compromising isolation characteristics in RF switch devices.
Innovation Solution
A dual charging and discharging circuit configuration with adjustable current levels for start-up and normal operating modes, utilizing a control circuit to manage PWM signals and driving signals for switches, allowing higher currents during start-up and lower currents during normal operation to stabilize negative voltage output.
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 rather than fixed. The control circuit dynamically changes the current loading of the charge pump based on operating conditions - using higher current during start-up to reach target voltage rapidly, then reducing to lower current during normal operation to minimize power consumption. This dynamic adaptation resolves the contradiction between fast start-up and low power consumption.
Solution Approach 2:
The patent changes the operating parameters of the charge pump based on the operational stage. By detecting whether the system is in start-up or normal operation mode, the control circuit adjusts the current loading parameter accordingly - higher current during start-up and lower current during normal operation. This parameter change strategy allows the system to achieve rapid voltage establishment initially while maintaining energy efficiency during sustained operation.
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 system dynamically adjusts current loading based on operational phase. During normal operation, the control circuit reduces current loading to minimize power consumption, while during start-up, it increases current loading to reduce initial loading time. This dynamic switching between operating modes resolves the contradiction between power efficiency and start-up speed.
Solution Approach 2:
The patent implements periodic switching between different operating modes (start-up mode and normal operation mode). The control circuit periodically transitions from high current loading during start-up to low current loading during normal operation. This periodic action pattern allows the system to prioritize speed when needed and efficiency when sustained operation is required.
3Productivity
If the size of the inverter and charging capacitor are enlarged to allow more current loading, then the target voltage is reached more rapidly and high currents are loaded, but power consumption increases considerably
Solution Approach 1:
Rather than using a permanently large inverter and capacitor that would enable high current loading at all times (consuming excessive power), the patent uses a control circuit to dynamically adjust the effective current loading. The physical components remain fixed, but the operational current is dynamically controlled - high during start-up, low during normal operation - thus achieving high productivity when needed without the continuous power penalty of oversized components.
Solution Approach 2:
The patent changes the operational parameters (current loading) based on system state rather than changing the physical size of components. By controlling the current through the existing inverter and capacitor based on operational mode, the system achieves high current loading capability during start-up without the continuous power consumption that would result from permanently operating at high current levels.
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 configuration reduces start-up time and power consumption in normal operation by managing current levels effectively, maintaining isolation characteristics in RF switch devices.
Implementation Method 1
The pumping capacitor circuit, connected between the middle node and a first capacitor node, is configured to charge based on a charging current from the dual charging circuit
Data Source
AI summary
A negative voltage circuit includes a dual charging circuit, a pumping capacitor circuit, a dual discharging circuit, an output switch circuit, and a load capacitor circuit. The dual charging circuit is configured to operate in a start-up or normal operating mode during a charging mode, and supply a first current in the start-up mode higher than a second current in the normal operating mode. The pumping capacitor circuit is configured to charge based on a charging current from the dual charging circuit. The dual discharging circuit is configured to operate in the start-up mode or the normal operating mode during a discharging mode, and discharge the pumping capacitor to allow a third current in the start-up mode to flow between the pumping capacitor and the terminal of the second operating voltage. The third current in the start-up mode is higher than a fourth current in the normal operating mode.