Voltage Supply Circuit Charge Pump Control for Responsivity
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Solution Overview
Problem
In electronic devices with low power consumption, existing voltage supply circuits face challenges in balancing power consumption reduction and responsivity, particularly when switching from an off-state to an on-state, due to poor responsiveness of the charge pump and voltage regulator.
Innovation Solution
A voltage supply circuit with a charge pump that operates continuously in on-mode and intermittently in off-mode, using a level shifter and charge pump control circuit to manage voltage transformation and supply, reducing power consumption while maintaining high responsivity upon startup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the voltage regulator and charge pump are stopped to reduce power consumption in off-state, then power consumption is reduced, but responsivity in rise of output voltage becomes poor when restarted
Solution Approach 1:
The charge pump control circuit maintains the charge pump in an operational state (or near-operational state) even when the voltage supply circuit is in off-mode, performing preliminary action to keep the output voltage ready. This ensures that when switching to on-mode, the charge pump can immediately respond without the startup delay, thus resolving the contradiction between power consumption reduction and responsivity improvement.
Solution Approach 2:
The system dynamically adjusts the operating state of the charge pump based on the mode (on-mode or off-mode). In off-mode, the charge pump operates intermittently or continuously at reduced activity to maintain readiness, while in on-mode it operates fully. This dynamic adjustment allows the system to balance power consumption and responsivity requirements under different operating conditions.
2Speed
If the charge pump operates continuously to maintain high responsivity, then voltage supply speed is improved, but power consumption increases
Solution Approach 1:
The charge pump control circuit implements periodic action by operating the charge pump intermittently in off-mode rather than continuously. The charge pump is activated periodically to maintain output voltage readiness while allowing periods of inactivity to reduce power consumption. This periodic operation resolves the contradiction by providing sufficient responsiveness only when necessary.
Solution Approach 2:
The system changes the operational parameters of the charge pump based on the mode. In off-mode, the charge pump operates with reduced frequency or duty cycle, changing its operational parameters to balance between maintaining readiness and reducing power consumption. This parameter adjustment allows the system to achieve acceptable responsivity while minimizing energy usage.
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 power consumption during off-mode operation and ensures rapid voltage supply responsiveness when switching to on-mode, enhancing the overall efficiency and performance of the voltage supply circuit.
Implementation Method 1
a charge pump circuit that is configured to transform a voltage of an input power supply and to apply the transformed voltage to the level shifter
Implementation Method 2
a level shifter that is configured to selectively output one of at least two voltage inputs
Data Source
AI summary
A voltage supply circuit includes a level shifter that switches between voltages of two voltage input units and that outputs one of the voltages, a charge pump that transforms a voltage of an input power supply and that applies the transformed voltage to the level shifter, and a charge pump control circuit. The voltage supply circuit controls supply and interruption of a predetermined voltage to a voltage-supplied circuit (RF switch 20). The charge pump control circuit causes the charge pump to perform a continuous operation in an on-mode and to perform an intermittent operation in an off-mode, the off-mode representing a state in which the voltage supply to the voltage-supplied circuit (RF switch 20) is stopped, the on-mode representing a state in which the predetermined voltage is supplied.