Charge Pump Circuit Dynamic Voltage Adjustment
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Solution Overview
Problem
Charge pump circuits in headphone driving devices consume high power due to constant generation of negative voltage, leading to inefficient power conversion and increased power consumption, especially during low output power operations.
Innovation Solution
A charge pump circuit with adjustable output voltage capabilities, utilizing a power-supply method that selects among three power-supply modes based on the amplitude of the input signal, controlling the connection relations of capacitors and switches with non-overlapping clock phases to optimize power conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the charge pump circuit generates a fixed negative voltage to supply the amplifier circuit, then the amplifier circuit can operate with sufficient power headroom, but the power consumption increases significantly during low output power operations
Solution Approach 1:
The charge pump circuit dynamically adjusts its output voltage based on the operating conditions. The control circuit monitors the power requirements and modifies the voltage conversion ratio accordingly, transitioning between different operating modes (e.g., 1:1, 2:1, 3:1 ratios) to match the actual power needs of the amplifier circuit, thereby avoiding constant high power consumption
Solution Approach 2:
The invention changes the output voltage parameter of the charge pump circuit based on different operating scenarios. By adjusting the voltage conversion ratio and output voltage levels dynamically, the system optimizes power efficiency while ensuring sufficient power supply capability for the amplifier circuit across different output power conditions
2Device complexity
If the charge pump circuit operates in constant single-mode conversion, then the circuit design is simple, but the power conversion efficiency is low and cannot adapt to different power requirements
Solution Approach 1:
The charge pump circuit transitions from static single-mode operation to dynamic multi-mode operation. The control circuit selectively activates different capacitor switching configurations to achieve various voltage conversion ratios (1:1, 2:1, 3:1), allowing the system to adapt to different power requirements while maintaining reasonable circuit complexity through systematic control
3Ease of manufacture
If the charge pump circuit generates negative voltage with fixed value, then the circuit framework is simple to implement, but the overall power efficiency deteriorates during low amplitude signal operations
Solution Approach 1:
The invention implements dynamic parameter adjustment by changing the output voltage value based on the amplitude of the input signal. The control circuit detects signal amplitude and adjusts the charge pump's voltage conversion ratio accordingly, reducing the output voltage during low amplitude operations to improve power efficiency while maintaining simple circuit implementation through systematic control logic
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
Reduces power consumption and enhances efficiency by dynamically adjusting output voltages according to the required power levels, improving overall power conversion efficiency and reducing unnecessary power usage in headphone driving devices.
Implementation Method 1
The charge pump circuit processes voltage conversion using the charging and discharging characteristics of the capacitors to provide desired output voltage
Data Source
AI summary
A charge pump circuit and power-supply method for dynamically adjusting output voltage is related to the charge pump circuit having three power-supply modes with different power conversion efficiencies. When supplying power, a pump unit controls the electrical connecting relations of a first flying capacitor, second flying capacitor, first storage capacitor and second storage capacitor through a first clock and second clock with non-overlapping working phases, to convert a source voltage into a positive output voltage and negative output voltage, thereby providing one of the three power-supply modes.