Temperature Computing Parameter Circuit for Voice Coil Monitoring
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Solution Overview
Problem
Conventional temperature monitoring systems in electronic devices require multiple transmission terminals and complex synchronization mechanisms to handle sensing voltage, current, and temperature, leading to increased IC area, wiring complexity, and reduced data transmission speed due to the need for three independent parameters.
Innovation Solution
A temperature computing parameter providing circuit that generates calibrated voltage values by using a reference resistor and a calibrating circuit to account for resistance-temperature variation, eliminating the need for separate temperature transmission and simplifying calculations by using only two necessary parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional temperature monitoring systems use three independent parameters (sensing voltage, sensing current, and temperature) for temperature monitoring, then temperature monitoring can be performed, but the required IC area increases and wiring complexity increases
Solution Approach 1:
The patent combines the temperature monitoring function with the existing sensing voltage and current parameters. Instead of using three independent parameters, the system calculates temperature by deriving it from the relationship between sensing voltage, sensing current, and the known resistance-temperature characteristics of the voice coil. This merging of functions reduces the number of independent measurement channels needed while maintaining temperature monitoring capability.
Solution Approach 2:
The sensing voltage and current parameters serve dual purposes: they are used for both audio signal processing and temperature monitoring. By making these parameters multi-functional, the system eliminates the need for separate dedicated temperature sensing circuits and transmission terminals, thereby reducing IC area and wiring complexity while maintaining reliable temperature monitoring.
2Reliability
If conventional temperature monitoring systems transmit three independent parameters (sensing voltage, sensing current, and temperature), then temperature monitoring can be performed, but the data transmission bandwidth is occupied and monitoring speed is reduced
Solution Approach 1:
The patent extracts the temperature information from the existing sensing voltage and current parameters through calculation rather than transmitting it as a separate independent parameter. By extracting temperature data from the relationship between voltage, current, and resistance characteristics, the system eliminates the need to allocate additional bandwidth for temperature transmission, thereby maintaining high monitoring speed while ensuring reliable temperature monitoring.
3Reliability
If conventional temperature monitoring systems compute temperature according to three kinds of parameters, then temperature can be monitored, but the calculation complexity increases
Solution Approach 1:
The patent changes the approach by using the known resistance-temperature characteristics of the voice coil as a reference. Instead of independently measuring and calculating from three parameters, the system uses the relationship between sensing voltage, sensing current, and the predetermined resistance-temperature curve to directly determine temperature. This parameter transformation simplifies the calculation by reducing it to a lookup or interpolation operation based on voltage and current ratios.
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 reduces the complexity of temperature calculations, minimizes bandwidth requirements, and eliminates the need for synchronization mechanisms, allowing for more efficient temperature monitoring in electronic devices.
Implementation Method 1
a reference temperature sensing circuit, coupled to the reference resistor, configured to sense a current reference temperature of the reference resistor
Implementation Method 2
The calibrating function corresponds to a resistance-temperature variation (nonlinear) function of the reference resistor
Data Source
AI summary
A temperature computing parameter providing circuit, configured to generate sensing voltage values and calibrated voltage values as temperature computing parameters for a target electronic device, including: a parameter computing circuit, configured to compute a reference voltage, which is a cross voltage of a reference resistor coupled to the target electronic device in series, to generate a reference voltage value, and to compute the sensing voltage, which is a cross voltage of the target electronic device, to generate the sensing voltage value; a reference temperature sensing circuit, configured to sense a current reference temperature of the reference resistor; and a computing circuit, configured to calibrate the reference voltage value to generate the calibrated voltage value according to a calibrating function and the current reference temperature. The calibrating function corresponds to a resistance-temperature variation function.