Dynamic Voltage Control for USB Speaker Amplifier Peak Power
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Solution Overview
Problem
USB-powered devices face limitations in power supply voltage (5V or less) and current (500mA or less), leading to insufficient power capacity, especially during peak consumption, which results in large capacitors required for compensation, hindering miniaturization of devices like USB amplifiers for speakers.
Innovation Solution
A power control apparatus with a voltage converter, feedback voltage generator, current detector, and voltage correction unit that adjusts output voltage and current to manage peak power demand, utilizing a capacitor for discharge-based power supplementation, allowing for miniaturization while maintaining high output power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a capacitor is provided at the input portion to compensate peak power, then peak power compensation is achieved, but the capacitor capacity and volume become large
Solution Approach 1:
The patent applies dynamics by making the capacitor discharge voltage variable rather than fixed. The control unit dynamically adjusts the discharge voltage based on real-time power consumption detection, allowing the capacitor to provide higher voltage during peak demand moments. This dynamic adjustment enables smaller capacitor capacity to achieve the same peak power compensation effect, thereby reducing capacitor volume while maintaining peak power compensation capability.
Solution Approach 2:
The patent changes the parameter of capacitor discharge voltage from a fixed value to a variable value that can be adjusted based on power consumption conditions. By controlling the discharge voltage to increase when power consumption increases and decrease when power consumption decreases, the system optimizes the capacitor's energy delivery efficiency, allowing smaller capacitors to provide sufficient peak power compensation.
2Adaptability or versatility
If USB terminal power supply limits are followed (5V, 500mA), then USB compatibility is maintained, but maximum usable power is restricted to 2.5W
Solution Approach 1:
The patent applies preliminary action by having the capacitor charge in advance during periods of low power consumption. The capacitor accumulates energy when the USB terminal is not at peak power demand, and then releases this pre-stored energy during peak consumption moments. This preliminary energy accumulation allows the system to exceed the instantaneous 2.5W USB limit without requiring a higher-rated power supply, maintaining USB compatibility while achieving higher peak power output.
Solution Approach 2:
The patent introduces a capacitor as an intermediary energy storage element between the USB power supply and the load. This intermediary component decouples the instantaneous power delivery from the USB supply limits, allowing the system to draw power at USB-compatible rates while delivering higher instantaneous power to the load through the capacitor's energy release. The control unit acts as another intermediary, managing the energy flow between these components.
3Power
If capacitor capacity is greatly increased to increase accumulated power, then peak power compensation improves, but device miniaturization is hindered
Solution Approach 1:
The patent applies dynamics by implementing variable discharge voltage control for the capacitor. Instead of using a large-capacity capacitor with fixed discharge characteristics, the system uses a smaller capacitor whose discharge voltage is dynamically adjusted based on real-time power consumption detection. This allows the smaller capacitor to deliver equivalent or superior peak power compensation performance, enabling device miniaturization while maintaining or improving accumulated power capability.
Solution Approach 2:
The patent changes the discharge voltage parameter of the capacitor from fixed to variable, controlled by the control unit based on detected power consumption levels. When power consumption increases, the discharge voltage increases; when power consumption decreases, the discharge voltage decreases. This parameter change allows optimal energy utilization from a smaller capacitor, achieving the required accumulated power effect without increasing device volume.
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
Enables miniaturization of power control systems and speaker apparatus by effectively managing peak power demand with a small power supply, achieving output power equal to or greater than the USB supply, even during peak usage.
Implementation Method 1
a capacitor which charges and discharges electric charges, wherein the capacitor discharges the electric charges in accordance with a reduction value of the predetermined voltage
Data Source
AI summary
The speaker apparatus according to the invention is arranged in a manner that when the magnitude of an audio signal Sin increases temporarily and so a consumption power increases, a DC-DC converter reduces an output voltage Vout to thereby increase an output current Iout and further discharges a capacitor to thereby increase a current supplied to an amplifier. Thus, a power of 2.5 W or more supplied from a USB connection terminal can be temporarily supplied to the amplifier. Further, since the change of the voltage difference between the both ends of the capacitor can be made large, an amount of the electric charges discharged from the capacitor can be made large and so the size of the capacitor can be reduced.