Charge Pump Power Supply with Polarity-Dependent Switching
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Solution Overview
Problem
Existing power amplifier topologies in personal audio devices waste power due to quiescent power consumption when maintaining voltage on both positive and negative supply rails during audio output signals of different polarities, reducing battery life and efficiency.
Innovation Solution
A charge pump power supply with a select input for operating modes and a switching circuit using capacitors to adjust power supply voltage based on audio signal polarity, where switches for the first polarity voltage operate at a higher frequency for positive polarity signals and a lower frequency for negative polarity signals, optimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a charge pump power supply maintains voltage on both positive and negative supply rails simultaneously, then the power amplifier can deliver full-signal output capability, but quiescent power is wasted in maintaining voltage on the inactive supply rail
Solution Approach 1:
The power supply topology is changed from static (both rails always active) to dynamic (rails switched based on signal polarity). The charge pump circuit dynamically switches between positive and negative supply rail configurations depending on whether the audio signal is positive or negative polarity, ensuring only the required rail is actively maintained at full voltage while the other is in low-power mode.
Solution Approach 2:
The operating parameters of the power supply are changed based on signal conditions. The charge pump switches between different voltage states and current levels on the supply rails depending on the audio signal polarity and amplitude, transitioning from a fixed parameter system to a variable parameter system that adapts to real-time signal requirements.
2Loss of energy
If the charge pump switches between different operating modes frequently, then power consumption is optimized, but switching losses increase
Solution Approach 1:
The charge pump operates using periodic switching action synchronized with the audio signal characteristics. By using periodic clock signals to control the switching of capacitors and transistors, the circuit achieves efficient energy transfer while minimizing unnecessary switching events. The switching frequency is optimized to balance between power consumption reduction and switching loss minimization.
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 approach reduces power dissipation and improves efficiency by dynamically adjusting the power supply voltage in response to audio signal polarity, maintaining full-signal output capability while minimizing power waste.
Implementation Method 1
The charge pump power supply may comprise a plurality of capacitors and a switching circuit for switching the capacitors to provide the first voltage or the second voltage
Data Source
AI summary
A charge pump power supply may comprise a plurality of capacitors and a switching circuit for switching the capacitors to provide a first voltage or a second voltage in accordance with the select input. The charge pump power supply may have a signal polarity input for indicating a polarity of an output audio signal. Switches for switching one or more capacitors providing a first polarity voltage in a then-current operating mode may be configured to switch at a greater frequency than switches for switching one or more capacitors providing a second polarity voltage responsive to the signal polarity input indicating a positive polarity of the output audio signal. Switches for switching one or more capacitors providing the first polarity voltage in a then-current operating mode are configured to switch at a lesser frequency than switches for switching one or more capacitors providing the second polarity voltage responsive to the signal polarity input indicating a negative polarity of the output audio signal.