UPS Audio Alert Circuit Using PWM Tones for State Indication
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Solution Overview
Problem
Users of uninterruptible power systems (UPS) lack real-time information on the current state and behavior of the device, making it difficult to take appropriate actions for normal operation.
Innovation Solution
A power device equipped with a speaker, audio circuit, and control unit that generates alert sounds through PWM signals, allowing users to identify the UPS's state and behavior through distinct audio patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If visual display interfaces are used to show UPS state information, then information display capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces visual display interfaces (mechanical/electronic display systems) with an acoustic notification system using a speaker and PWM-generated tones. This substitution provides state information through sound frequencies rather than visual displays, reducing device complexity and cost while maintaining information delivery capability.
Solution Approach 2:
The patent introduces an audio circuit as an intermediary between the control unit and the user. This intermediary converts digital state information into audible PWM tones, providing a simplified interface that reduces the need for complex display hardware while effectively communicating device status.
2Loss of information
If multiple alert types are distinguished by different methods, then information differentiation is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by assigning different PWM frequencies (different pitch qualities) to different alert types. Normal operation uses one frequency, warnings use another, and errors use a third, allowing clear differentiation of device states through localized frequency variations in the acoustic output.
Solution Approach 2:
The patent changes the frequency parameter of the acoustic signal to differentiate between various alert types. By varying the PWM frequency, the system can indicate different operational states (normal, warning, error) without adding complexity, as the same speaker hardware handles all frequency variations.
3Loss of time
If real-time state information is provided to users, then operational responsiveness is improved, but energy consumption increases
Solution Approach 1:
The patent uses periodic acoustic alerts rather than continuous information display. The speaker emits tones only when state changes occur or at periodic intervals, providing real-time awareness of critical changes while minimizing energy consumption by keeping the acoustic system dormant during normal stable operation.
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
Enables users to instantly recognize the UPS's state and behavior via audible alerts, ensuring timely responses for maintaining normal operation.
Implementation Method 1
The audio circuit is also configured to select one of the audio files according to a control command, generate a first PWM signal according to the selected audio file
Implementation Method 2
The speaker comprises a first input terminal, and is configured to emit sound according to the signal received by the first input terminal
Data Source
AI summary
A power device comprises a speaker, an audio circuit and a control unit. The speaker comprises a first input terminal, and is configured to emit sound according to the signal received by the first input terminal. The audio circuit comprises a first output terminal, and the first output terminal is electrically coupled to the first input terminal. The audio circuit stores a plurality of audio files, and each audio file corresponds to an alert sound. Each alert sound comprises at least two pitches, and each pitch corresponds to a PWM frequency. The audio circuit is also configured to select one of the audio files according to a control command, generate a first PWM signal according to the selected audio file, and output the first PWM signal from the first output terminal. The control unit is configured to generate a corresponding control command according to a determination result.