Adaptive Charge Pump Circuit for Power Consumption Reduction
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Solution Overview
Problem
Conventional charge pump circuits for video amplifiers operate at a power-supply range of 2 VDD, leading to increased power consumption due to the generation of a negative power-supply voltage that is always −VDD, regardless of the video amplifier's output voltage.
Innovation Solution
A charge pump circuit with a switching circuit and multiple capacitors that accumulate and transfer electric charge across different states of a clock signal to generate both positive and negative output power-supply voltages, with the absolute values of these voltages being approximately half the input voltage, allowing for reduced power consumption by converting input power VDD×I into ½ VDD×2I.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional charge pump circuit generates a negative power-supply voltage of −VDD, then the driven circuit can operate with a fixed power-supply range of 2 VDD, but the power consumption of the driven circuit increases
Solution Approach 1:
The charge pump circuit dynamically adjusts the negative power-supply voltage magnitude based on the signal amplitude detected by the detection circuit. When the signal amplitude is small, the negative voltage magnitude is reduced, thereby lowering power consumption. When the signal amplitude is large, the negative voltage magnitude is increased to maintain proper circuit operation. This dynamic adjustment resolves the contradiction between maintaining reliable power supply and reducing power consumption.
Solution Approach 2:
The invention changes the parameter of negative power-supply voltage magnitude from a fixed value (−VDD) to a variable value that adapts to signal conditions. The detection circuit monitors signal amplitude and controls the charge pump to output different negative voltage magnitudes accordingly, transforming the power-supply system from static to adaptive, thus reducing power consumption while maintaining operational reliability.
2Ease of manufacture
If the negative power-supply voltage is always −VDD regardless of output voltage, then the power supply is simple to implement, but the power consumption increases
Solution Approach 1:
The detection circuit acts as an intermediary between the signal output and the charge pump circuit. It detects the signal amplitude and generates control signals that regulate the charge pump's output voltage. This intermediary component enables adaptive power supply without significantly complicating the overall implementation, as the detection and control mechanisms can be integrated into existing circuit architectures.
3Stability of the object's composition
If the charge pump circuit uses a fixed power-supply range of 2 VDD, then the circuit operation is stable, but the adaptability to different signal amplitudes is reduced
Solution Approach 1:
The power supply system transitions from a static fixed-range configuration to a dynamic adaptive configuration. The charge pump circuit responds to real-time signal amplitude measurements by adjusting the negative voltage magnitude, enabling the circuit to adapt to different signal conditions while maintaining stable operation through controlled feedback from the detection circuit.
Solution Approach 2:
The charge pump circuit gains multi-functionality by serving both as a stable power supply source and as an adaptive voltage regulator. The same circuit architecture provides fixed power supply when needed and adaptive power supply when signal variation requires optimization, making the system universally applicable to different operating conditions without requiring separate dedicated circuits.
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
The circuit achieves reduced power consumption by generating positive and negative output power supplies with half the voltage of the input, doubling the current supply capability and allowing for adaptable voltage and current switching based on signal magnitude, thereby optimizing power usage.
Implementation Method 1
a first capacitor (for example, a capacitor 201a, as illustrated in FIG. 2); a second capacitor (for example, a capacitor 201b, as illustrated in FIG. 2) connected in series with the first capacitor; a third capacitor (for example, a capacitor 201c, as illustrated in FIG. 2) for holding the electric charge corresponding to the negative output power-supply voltage
Data Source
AI summary
There is provided a charge pump circuit suited for reducing the power consumption. A capacitor 201a, a capacitor 201b, a capacitor 201c, and switching elements 202a to 202k, for electrically connecting or separating capacitors 201a, 201b, and 201c, repeats: a first state where charge supplied from an input power-supply voltage VDD is accumulated in the capacitors 201a and 201b; a second state where the charge accumulated in the capacitor 201a is transferred to the third capacitor 201c, and a positive output power-supply voltage is held by the charge accumulated in the capacitor 201b; a third state where the charge supplied from an input power supply is accumulated in the capacitors 201a and 201b; and a fourth state where the charge accumulated in the capacitor 201b is transferred to the third capacitor 201c, and the positive output power-supply voltage VCC is held by the charge accumulated in the capacitor 201a.