Segmented Voice Coil Driving for Heat and Distortion Reduction
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Solution Overview
Problem
Current voice coil driving systems experience heating issues due to coil windings not fully within the air gap, leading to interference among different frequency drivers, which deteriorates sound quality.
Innovation Solution
A voice coil driving system with a magnetic circuit and driving circuit that classifies audio signals into first and second classes, selectively driving specific voice coil sections based on excursion to reduce energy loss and distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If driving signals are transmitted to all coil windings, then the voice coil can be driven to move back and forth, but coil windings not located in the air gap still receive driving signals resulting in heating the voice coil
Solution Approach 1:
The voice coil is divided into multiple coil groups along the axial direction, with each group independently controllable. The driving circuit selectively activates only the coil groups currently positioned within the air gap, while deactivating those outside the air gap, thereby preventing unnecessary heating and improving thermal management.
Solution Approach 2:
The system dynamically adjusts which coil groups receive driving signals based on the real-time position of the voice coil. As the voice coil moves back and forth, the driving circuit continuously switches activation between different coil groups to ensure only those within the air gap are energized, optimizing both thermal performance and driving efficiency.
2Reliability
If different frequency driving signals are transmitted to different drivers, then frequency-specific driving is achieved, but different drivers interfere with one another declining the quality of the sound
Solution Approach 1:
The voice coil is segmented into multiple coil groups that can be independently controlled. Different frequency driving signals are assigned to different coil groups, allowing frequency-specific driving without interference between drivers, as each coil group acts as an independent driving unit within the same magnetic circuit.
Solution Approach 2:
A single voice coil assembly with multiple coil groups serves multiple functions: it can handle different frequency ranges simultaneously through selective activation of different coil groups, eliminating the need for separate drivers while maintaining sound quality and reducing driver 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
Improves sound quality and driving efficiency by reducing audio distortion and energy loss in the voice coil.
Implementation Method 1
A plurality of driving signals are respectively transmitted to the coil windings to drive the voice coil so that the voice coil moves back and forth to cause vibrations in a diaphragm to generate a sound
Data Source
AI summary
A voice coil driving system includes a magnetic circuit, a voice coil and a driving circuit, and the voice coil is suspended in the air gap and includes a plurality of voice coil sections. A method of driving a voice coil performed by the driving circuit comprises: receiving an audio signal; determining whether the audio signal belongs to a first class signal or a second class signal; when determining that the audio signal belongs to the first class signal, selecting a target voice coil section from the voice coil sections according to the excursion of the voice coil and generating and transmitting a first driving signal to the target voice coil section according to the first class signal; when determining that the audio signal belongs to the second class signal, generating and transmitting second driving signals to the voice coil sections according to the second class signal.