Start-Up Oscillator Control for Low-Power Timing Sequences
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Solution Overview
Problem
Existing start-up circuits for electronic equipment consume excessive power due to continuous operation of oscillators, even after the start-up sequence is completed, which is unnecessary and increases power consumption.
Innovation Solution
A start-up circuit that turns on an oscillator only when the power key is pushed and stops it after the start-up sequence is finished, or uses a timer to stop the oscillator after a predetermined time-out period, reducing power consumption by preventing unnecessary operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the oscillator operates continuously to generate clock signals for timing measurement, then the timing function is reliable, but the power consumption increases
Solution Approach 1:
The oscillator operates periodically rather than continuously. It is activated only during the start-up sequence execution period and turned off afterwards, reducing power consumption while maintaining timing functionality when needed. The control circuit manages the oscillator's on/off states based on the execution status of the start-up sequence.
Solution Approach 2:
The oscillator's operational state is dynamically adjusted based on system conditions. The control circuit changes the oscillator's state from active to inactive according to whether the start-up sequence is being executed, making the system adaptive to different operational phases.
2Use of energy by moving object
If the oscillator is stopped after start-up sequence completion, then power consumption is reduced, but timing measurement capability is lost
Solution Approach 1:
The oscillator is activated in advance before the start-up sequence execution begins and remains active throughout the execution period. This ensures timing measurement capability is available when needed without requiring continuous operation, as the oscillator is turned off only after the sequence completes.
3Manufacturing precision
If the oscillator operates while the power key is held down, then start-up sequencing is accurate, but unnecessary clock generation increases power consumption after start-up completes
Solution Approach 1:
The control circuit monitors the execution status of the start-up sequence and uses this feedback to control the oscillator's operation. When the sequence completes, the control circuit receives feedback and turns off the oscillator, preventing unnecessary energy consumption while maintaining accurate sequencing during execution.
Solution Approach 2:
The continuous clock generation function is extracted and separated from the system. Instead of continuously generating clock signals, the oscillator is activated only during the specific period when start-up sequencing is executed, removing the unnecessary energy consumption component.
Data Source
AI summary
A start-up circuit receives a start-up signal instructing start-up of an equipment mounted with the circuit, and executes a predetermined sequence when start-up is instructed by the start-up signal. An oscillator generates a clock signal. A sequence circuit receives the start-up signal and a clock signal output from the oscillator, measures time by counting the clock signal when the start-up signal transits to a predetermined level, and executes a predetermined event at a predetermined timing. The oscillator operates for a period where the start-up signal is at the predetermined level if the start-up signal is at the predetermined level during the period the power key of the equipment mounted with the circuit is being pushed.