Hearing Device Valve Voltage Regulation via Segmented Power Supply
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Solution Overview
Problem
Hearing devices with electrically adjustable valves face challenges in managing short-term power peaks, leading to voltage drops and potential device shut-off, especially in battery-driven devices with low battery charge, which requires overdesigning voltage regulators and increasing costs and size.
Innovation Solution
A hearing device design where the valve voltage is generated separately from the voltage regulator, using a rechargeable battery with low output resistance and a processor-controlled switching element, such as a semiconductor, to manage current pulses without loading the voltage regulator, and incorporating a filter with capacitors and inductors to minimize voltage drops and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the voltage regulator is dimensioned to provide peak currents for valve switching, then the valve can be switched reliably, but the voltage regulator becomes overdesigned increasing costs and device size
Solution Approach 1:
The power supply system is segmented into two independent paths: the voltage regulator continues to provide stable operating voltage for low-power components, while a separate battery connection with switching element provides high-current pulses for valve actuation. This segmentation allows each component to be optimally sized for its specific function without overdesign.
Solution Approach 2:
A switching element (transistor or MOSFET) is introduced as an intermediary between the battery and the valve. This intermediary enables controlled current flow for valve switching while isolating the voltage regulator from high-current transients, allowing the regulator to remain compact and cost-effective.
2Reliability
If the voltage regulator is overdesigned to handle peak currents, then voltage drops are avoided, but the device miniaturization is compromised
Solution Approach 1:
The power delivery system is divided into two separate pathways: a low-power stable voltage path through the voltage regulator for processor and electronics, and a high-power pulse path through the battery and switching element for valve actuation. This allows the voltage regulator to be miniaturized since it only needs to handle low average currents.
Solution Approach 2:
The battery is pre-charged to provide high current pulses on demand. The switching element is designed to deliver these pre-stored energy pulses directly to the valve without requiring the voltage regulator to be oversized, enabling compact regulator design while maintaining voltage stability during switching events.
3Power
If a high current is drawn from the battery for valve switching, then the valve can be actuated, but voltage drops and audible electrical interferences occur
Solution Approach 1:
The switching element acts as an intermediary that isolates the battery's high-current discharge from the processor and voltage regulator. By controlling the switching timing and providing a dedicated high-current path, the intermediary prevents current draw from affecting other circuit components, eliminating voltage drops and electrical interferences in the audio signal path.
Solution Approach 2:
The electrical circuit is segmented into independent power domains: a high-current domain for valve actuation connected directly to the battery through the switching element, and a low-current domain for processor and electronics connected through the voltage regulator. This segmentation prevents harmful electrical interferences from propagating between domains.
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 design allows reliable valve operation with reduced load on the voltage regulator, minimizing voltage drops and energy losses, enabling compact and efficient power management while maintaining device reliability and reducing costs.
Implementation Method 1
If a valve voltage is applied to the valve, a current running through a solenoid results in an adjustment of the valve which causes an acoustical effect of the valve.
Implementation Method 2
incorporating a filter with capacitors and inductors to minimize voltage drops and interference
Implementation Method 3
using a rechargeable battery with low output resistance
Data Source
AI summary
An illustrative hearing device includes a battery having a battery voltage, a microphone for transducing sound into an input signal, a processor configured to be operated with an operating voltage and to generate an output signal from the input signal, a speaker for transducing the output signal to an acoustic signal, and a valve. An acoustic effect of the valve is adjustable by applying a valve voltage, wherein the adjustment is controllable by the processor. The hearing device comprises a voltage regulator configured to generate the operating voltage from the battery voltage, wherein the operating voltage is less than the battery voltage and wherein the valve voltage is greater than the operating voltage.