Switched-Capacitor Hearing Aid Power Supply for Multi-Voltage Output
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Solution Overview
Problem
Conventional hearing devices face challenges in providing multiple desired output voltages efficiently while maintaining a compact architecture and minimizing electromagnetic interference, particularly due to the limitations of buck DC-DC converters and linear regulation in small electronic devices like hearing aids.
Innovation Solution
A hearing device employing a switched capacitor DC-DC converter with multiple output ports and a flying capacitor to redistribute charge, utilizing a switching circuitry with a plurality of switches to provide multiple predefined output voltages based on an input voltage range, allowing for efficient power distribution to various components such as microprocessors and signal processors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If buck DC-DC converters are used to adapt voltage levels, then voltage adaptation capability is improved, but device size increases and electromagnetic interference is generated
Solution Approach 1:
The patent extracts and eliminates the inductor coil from the voltage conversion circuitry, replacing it with a switched capacitor DC-DC converter that achieves voltage adaptation without magnetic components. This removal resolves both the size issue and the electromagnetic interference problem while maintaining voltage adaptation capability.
Solution Approach 2:
The patent substitutes the magnetic field-based inductor coil with an electric field-based switched capacitor system. This replacement uses capacitors and electronic switches instead of magnetic components, achieving voltage conversion through capacitive charging/discharging cycles rather than electromagnetic induction, thereby eliminating EMI and reducing size.
2Device complexity
If linear regulation is used to adapt voltage levels, then device complexity is reduced, but power efficiency deteriorates
Solution Approach 1:
The patent implements periodic switching action in the switched capacitor DC-DC converter, where capacitors are charged and discharged in cyclic phases. This periodic operation enables efficient energy transfer and voltage conversion without the continuous energy dissipation characteristic of linear regulation, achieving high power efficiency while maintaining relatively simple circuit architecture.
Solution Approach 2:
The patent changes the operating parameters by using switched capacitor technology instead of linear regulation. The converter dynamically adjusts voltage levels through controlled charging and discharging of capacitors at specific switching frequencies, enabling efficient voltage adaptation without the linear voltage drop and associated power loss.
3Adaptability or versatility
If inductor coils are used for voltage conversion, then voltage adaptation is achieved, but electromagnetic interference is induced
Solution Approach 1:
The patent removes the inductor coil entirely from the voltage conversion system, replacing it with a switched capacitor architecture that achieves voltage adaptation through capacitive energy storage and transfer. This extraction eliminates the magnetic field generation that causes electromagnetic interference while preserving the voltage conversion function.
Solution Approach 2:
The patent substitutes the electromagnetic induction mechanism (inductor coil) with an electrostatic energy transfer mechanism (switched capacitors). By using electric field-based capacitive coupling instead of magnetic field-based inductive coupling, the system achieves voltage conversion without generating electromagnetic interference.
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 efficient power delivery to multiple components within the hearing device, enhancing computational efficiency and reducing electromagnetic interference, while maintaining a compact design and high power efficiency, supporting a wide range of input voltages with tight voltage tolerances.
Implementation Method 1
at least one flying capacitor configured for redistributing charge from the power source to the multiple ports and/or in between the output ports
Data Source
AI summary
A hearing aid includes: a power source; and a switched capacitor DC-DC converter electrically connected to the power source and having an input part configured for receiving charge from the power source at an input voltage of an input voltage range; an output part having multiple output ports, the output part being configured for supplying charge to the multiple output ports for providing multiple predefined output voltages; at least one flying capacitor configured for redistributing charge from the power source to the multiple output ports and/or in between the output ports; and a switching circuitry having a plurality of switches configured for electrically switching the switched capacitor DC-DC converter based on a switching scheme so as to provide the multiple predefined output voltages based on the input voltage.