Amplifier Power Supply With Charge Pump Voltage Ratio Control
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Solution Overview
Problem
Existing power supply devices for amplifiers face challenges in reducing power consumption while enlarging the output range, as single power supplies with charge pumps lead to unstable voltage and restricted output ranges, and increasing voltage or capacitance results in increased power consumption or larger capacitor sizes.
Innovation Solution
A power supply device with separate generators for positive and negative voltages, a charge pump, and a control unit to adjust voltages such that the negative voltage is a specific multiple of the positive voltage, allowing for flexible power settings and reduced capacitor size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the voltage VDD is increased to enlarge the output range of the amplifier, then the output range is improved, but the power consumption increases
Solution Approach 1:
The patent implements dynamic voltage adjustment where the voltage VDD is adaptively changed based on the operating mode. In power-saving mode, a lower voltage is used to reduce power consumption, while in normal mode, the voltage is increased to provide sufficient output range. This dynamic adjustment resolves the contradiction by making the voltage level context-dependent rather than fixed.
Solution Approach 2:
The patent changes the voltage parameter VDD according to different operating requirements. By adjusting this key parameter dynamically between different modes of operation, the system can achieve both power savings when high output range is not needed and adequate performance when it is required, thus resolving the contradiction between output range and power consumption.
2Stability of the object's composition
If the capacitance of the capacitors in the charge pump is increased to reduce voltage ripple, then the voltage stability is improved, but the capacitor size increases
Solution Approach 1:
The patent employs dynamic control of the charge pump operation to maintain voltage stability without requiring large capacitors. By actively managing the charging and discharging cycles based on load conditions and using multiple charge pumps with alternating operation, the system achieves stable voltage output with smaller capacitor sizes, thus resolving the contradiction between voltage stability and capacitor size.
Solution Approach 2:
The patent divides the charge pump function into multiple parallel charge pumps that operate in an alternating fashion. This segmentation allows the system to maintain continuous stable voltage output while using smaller individual capacitors for each charge pump, thereby resolving the contradiction between voltage stability and capacitor size by distributing the capacitance requirement across multiple components.
3Device complexity
If a single power supply is used to drive multiple amplifiers, then the device complexity is reduced, but current variation causes malfunction and reduces system efficiency
Solution Approach 1:
The patent segments the power supply into multiple independent power supplies, each dedicated to driving a specific amplifier. This segmentation prevents current variations from one amplifier from affecting others, thereby maintaining system stability and reliability while still keeping the overall structure relatively simple through modular design.
Solution Approach 2:
The patent introduces a current variation compensation mechanism that acts as an intermediary to detect and compensate for current variations in real-time. This intermediary system monitors the power supply current and adjusts parameters to prevent malfunction, thus maintaining high reliability even with a simplified single-power-supply structure.
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 solution enables reduced power consumption in power-saving modes and increased output range in normal modes without curtailment of signal amplitudes, while also preventing current variations from affecting multiple amplifier systems.
Implementation Method 1
the charge pump is substantially composed of capacitors and thereby, generates the Voltage VSS via charging and discharging of the capacitors
Data Source
AI summary
A power supply device for driving an amplifier includes a power generator for providing a first voltage for a first power reception end of the amplifier, a power conversion unit coupled to the power generator, for converting the first voltage into a second voltage, a charge pump coupled between the power conversion unit and a second power reception end of the amplifier, for generating a third voltage for the amplifier according to the second voltage, and a control unit coupled to the power conversion unit, for controlling the power conversion unit, so as to adjust the second voltage to make the third voltage equal to a specific multiple of the first voltage.