Charge Pump Voltage Control Without Amplifier Feedback Delay

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Solution Overview

Problem

Conventional charge pump control circuits using amplifiers to convert feedback analog control signals into digital signals result in prolonged reaction times, leading to output voltage fluctuations and increased power consumption and circuit area occupation.

Innovation Solution

A power supply circuit comprising a clock buffer, charge pump, control circuit, and voltage clamp circuit, which generates an adjusted clock signal and level control signal to regulate the output voltage within a preset range without the need for amplifiers, using a dynamic voltage adjustment method that includes a clock buffer, charge pump, control circuit, and voltage clamp circuit to adjust the clock signal and level control signal.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an amplifier is used to convert feedback analog control signals into digital control signals, then voltage comparison and control can be achieved, but the circuit area increases and power consumption increases

Engineering Contradiction:

Improvevoltage control precisionVSAvoidcircuit area

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The patent extracts and removes the amplifier component from the charge pump control circuit. Instead of using an amplifier to compare voltages and generate control signals, the invention uses a direct voltage comparison mechanism where the output voltage is compared against a reference voltage through a feedback network, eliminating the need for the amplifier and thereby reducing circuit area and power consumption while maintaining control precision

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent uses a feedback voltage division network to create a scaled copy of the output voltage that can be directly compared with a reference voltage. This copying approach allows the control circuit to monitor and regulate the output voltage without requiring high-power amplification, achieving precise voltage control with lower power consumption and smaller circuit area

Inventive Principle:

Principle #26Copying

2Reliability

If an amplifier is used to convert feedback analog control signals into digital control signals, then voltage comparison and control can be achieved, but power consumption increases

Engineering Contradiction:

Improvevoltage control precisionVSAvoidcontrol circuit power consumption

Core Design Contradiction:

ReliabilityVSUse of energy by stationary object

Solution Approach 1:

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the expensive and power-consuming amplifier with a simple, low-cost voltage division network and comparator arrangement. This substitution uses passive components (resistors, capacitors) and simple switching elements that consume minimal power, achieving the same voltage control function with significantly reduced power consumption

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Device complexity

If digital control signals with only two states are used, then control circuit simplicity is maintained, but reaction time increases causing output voltage to be too high or too low

Engineering Contradiction:

Improvecontrol circuit complexityVSAvoidcontrol reaction time

Core Design Contradiction:

Device complexityVSLoss of time

Solution Approach 1:

The patent implements dynamic control by using a feedback mechanism that continuously monitors the output voltage and adjusts the charge pump operation in real-time. The control circuit dynamically switches between different control states based on the instantaneous voltage error, enabling faster response to voltage deviations while maintaining manageable circuit complexity through systematic control logic

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent employs a feedback control mechanism where the output voltage is continuously monitored and fed back to the control circuit. This feedback loop enables the system to detect voltage deviations and respond rapidly by adjusting the charge pump control signals, significantly reducing reaction time and preventing excessive voltage excursions while maintaining controlled circuit complexity

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12614981B2Power supply circuit and dynamic voltage adjustment method

Publication Date: 2026.04.28 POWERX SEMICONDUCTOR CORPORATION

AI summary

A power supply circuit includes a clock buffer, a charge pump, a control circuit and a voltage clamp circuit. The clock buffer is configured to generate an adjusted clock signal according to a clock signal and level control signal. The clock signal includes a preset level. The charge pump is coupled to the clock buffer to generate an output signal according to adjusted clock signal and a system voltage. The control circuit is coupled to the charge pump to generate a charge pump control signal according to the output signal. The voltage clamp circuit is coupled between the control circuit and clock buffer to receive the charge pump control signal and a system voltage. The voltage clamp circuit outputs a level control signal according to the charge pump control signal. In response to a level of the level control signal, the adjusted clock signal includes an adjusted level.