Charge Pump Regulator Current Control Ripple Reduction
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Solution Overview
Problem
Existing charge pump regulators face issues with large input ripple, high frequency noise, and inefficiency due to added series resistance and large chip size, which are not effectively addressed by previous solutions.
Innovation Solution
A charge pump regulator with a current control element on the charge or discharge path, driven by an output-dependent feedback signal, which controls current flow without additional series resistance, using voltage-controlled power sources and multi-phase non-overlapping clocks to reduce ripple and noise, and avoid shoot-through.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a variable resistor is inserted between the power supply and the input terminal of the charge pump to control input current, then the supply voltage disturbance is reduced, but the input series resistance is increased and power consumption is increased
Solution Approach 1:
The patent introduces variable resistors as intermediary elements that provide precise current control without requiring large fixed series resistance. By using controllable resistance that can be dynamically adjusted based on operating conditions, the system achieves supply voltage disturbance reduction with minimal power loss, as the resistance is only increased when necessary for ripple control.
Solution Approach 2:
The patent employs dynamic resistance control where the variable resistors are adjusted in real-time based on feedback signals. This dynamic adjustment allows the system to maintain low resistance (and thus low power consumption) during normal operation while only increasing resistance when needed to reduce supply voltage disturbance, rather than maintaining high fixed resistance at all times.
2Object-generated harmful factors
If a current source is inserted between the power supply and the input terminal of the charge pump to provide stable input current, then the input ripple is reduced, but an added element outside the charge pump is required
Solution Approach 1:
The patent merges the current control function directly into the charge pump circuit structure by integrating variable resistors within the charge and discharge paths. This integration eliminates the need for separate external current sources, as the control elements are combined with the pump circuit itself, reducing overall device complexity while maintaining ripple reduction performance.
Data Source
AI summary
A charge pump regulator has a charge pump to establish a charge path and a discharge path alternately, so as to produce a regulated voltage on an output terminal. The charge pump has at least a current control element on the charge path or the discharge path to control the current flowing therethrough according to an output-dependent feedback signal.