OCXO Clock Abnormality Shutdown for Stable Resonator Heating
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Solution Overview
Problem
Existing oven controlled crystal oscillators (OCXO) face challenges in maintaining temperature control stability due to abnormal clock signals, which can lead to excessive heat generation by the temperature control element.
Innovation Solution
The oscillator incorporates a clock signal abnormality detection circuit that stops the output of the control voltage to the temperature control element when an abnormality in the clock signal is detected, preventing excessive heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a digital signal processing circuit controls a temperature control element based on a digital signal, then temperature control precision is improved, but reliability deteriorates when the clock signal becomes abnormal
Solution Approach 1:
The patent applies preliminary action by detecting clock signal abnormalities before they cause excessive heat generation. The detection circuit monitors the clock signal in advance, and when an abnormality is detected, it preemptively stops the control signal output to the temperature control element, preventing the harmful effect from occurring.
Solution Approach 2:
The patent introduces a clock signal abnormality detection circuit as an intermediary between the digital signal processing circuit and the temperature control element. This intermediary component monitors the clock signal and mediates the control flow by stopping the control signal when abnormalities are detected, thereby protecting the temperature control element from excessive heat generation.
2Stability of the object's composition
If the temperature control element operates continuously to maintain temperature, then temperature stability is improved, but harmful heat generation occurs when clock signal abnormalities exist
Solution Approach 1:
The patent implements feedback by having the clock signal abnormality detection circuit continuously monitor the clock signal status and provide feedback control. When an abnormality is detected, the detection circuit feeds back a stop signal to the temperature control element, adjusting its operation to prevent excessive heat generation while maintaining normal operation during stable clock signal conditions.
Data Source
AI summary
An oscillator includes a resonator element, an oscillation circuit configured to oscillate the resonator element to generate a clock signal, a temperature sensor, a digital control circuit configured to operate based on the clock signal and output a control signal based on a temperature detected by the temperature sensor, a temperature control circuit configured to output a control voltage based on the control signal, a temperature control element configured to control a temperature of the resonator element based on the control voltage, and a clock signal abnormality detection circuit configured to detect an abnormality in the clock signal. The clock signal abnormality detection circuit stops an output of the control voltage to the temperature control element performed by the temperature control circuit when the abnormality in the clock signal is detected.