Tire Pressure Detector Power Reduction via VCO and Amplifier Segmentation
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Solution Overview
Problem
Conventional tire pressure detectors face issues with high power consumption due to always-powered voltage-controlled oscillators (VCOs) and integrated PLL and power amplifiers, leading to increased current consumption and noise in transmissions.
Innovation Solution
The VCO is powered only in response to logic states of input data bits, and the PLL circuit and power amplifier are separated from the main IC chip, allowing for separate control and reducing noise and current consumption by using external power amplifiers like Class A or Class B types, which are activated only when needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the VCO is always powered-on to ensure continuous operation, then reliability is improved, but power consumption increases
Solution Approach 1:
The VCO is powered-on only during specific periods when data transmission is required (when input data bits have a one state), and powered-off during other periods (when input data bits have a zero state). This periodic activation based on data states reduces power consumption while maintaining reliability during active transmission windows.
2Device complexity
If the PLL circuit and power amplifier are integrated on a single IC chip, then device complexity is reduced, but noise increases
Solution Approach 1:
The system is segmented into two separate parts: the PLL circuit remains on the IC chip for compact data processing, while the power amplifier is moved to an external component. This segmentation isolates the noise-generating power amplifier from sensitive on-chip circuits, reducing electromagnetic interference and noise in transmissions.
3Reliability
If the power amplifier is always active to ensure signal transmission capability, then reliability is improved, but power consumption increases
Solution Approach 1:
The power amplifier is activated periodically only when transmission is needed (responsive to logic states of input data bits) and deactivated when not needed. This periodic operation maintains signal transmission capability during active periods while dramatically reducing average power consumption during idle periods.
Solution Approach 2:
The power amplifier transitions from a static always-on state to a dynamic state where it is activated and deactivated based on real-time data transmission requirements. This dynamic control allows the system to adapt power consumption to actual operational needs.
Data Source
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AI summary
A tire pressure detector employs a reduced power consumption mechanism comprising a PLL circuit including a VCO, that is operated in response to the logic states of an input data stream and a power amplifier configured to be externally located to an integrated circuit. The input data stream includes tire pressure information and is configured to be encoded to have multiple logic states. A micro¬ controller is employed to control the VCO, turning the VCO, and/or the amplifier, on and off for a certain period, according to the pattern of each data bit of the input data stream thus providing reduced current consumption. This tire pressure detector thus embodies an optimized circuit arrangement in terms of power efficiency.