Piezo Sounder Circuit With Self-Testing and Adjustable Sound Output
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Solution Overview
Problem
Conventional sounder devices face challenges in detecting malfunctions during normal operation due to disruptive noise testing, and lack flexibility in sound level adjustment, leading to inefficiency and high manufacturing costs.
Innovation Solution
A self-testing sounder device with a controller that adjusts voltage and duty cycle to generate adjustable sound levels, incorporating a piezo-electric element, capacitor, and inductor for resonance, and includes a controller for self-diagnosis and dynamic sound level adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sounder devices use fixed sound levels and manual testing methods, then manufacturing is simpler, but operational reliability cannot be verified during normal operation and sound level flexibility is limited
Solution Approach 1:
The controller performs self-diagnosis and malfunction detection during normal operation by monitoring capacitor voltage and sounder circuit current, enabling reliability verification before actual failures occur without adding complex external testing equipment
Solution Approach 2:
The sounder device performs self-testing and self-diagnosis functions through its existing controller, capacitor, and sounder circuit components, eliminating the need for separate manual testing equipment and reducing overall system complexity while improving reliability monitoring
2Reliability
If disruptive noise testing is used to detect malfunctions, then malfunction detection is possible, but normal operation is disrupted and testing frequency is limited
Solution Approach 1:
The patent replaces mechanical/disruptive noise-based testing with electronic monitoring of capacitor voltage and sounder circuit current parameters, allowing continuous non-intrusive malfunction detection during normal operation without acoustic disruption
Solution Approach 2:
The controller continuously monitors capacitor voltage and sounder circuit current during normal operation, providing real-time feedback on component health and enabling malfunction detection without disrupting operational continuity
3Adaptability or versatility
If fixed sound levels are used in conventional sounders, then device complexity is reduced, but adaptability to different environments and regulations is limited
Solution Approach 1:
The controller dynamically adjusts the duty cycle of the switch to vary the average voltage across the sounder circuit, enabling flexible sound level adjustment while using simple PWM control techniques that do not significantly increase device complexity
Solution Approach 2:
The patent changes the duty cycle parameter of the switch to control the average power delivered to the sounder circuit, providing adaptable sound levels for different environments and regulations through a single controllable parameter
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 reliable, non-disruptive testing and flexible sound level adjustment, reducing manufacturing complexity and costs while ensuring operational reliability.
Implementation Method 1
a sounder circuit that comprises a piezo-electric element
Implementation Method 2
the inductor and an internal capacitance of the piezo-electric element creates a resonance circuit that amplifies the voltage being supplied to or applied across the piezo-electric element
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
Described herein is a sounder device (100). The sounder device (100) comprises a sounder circuit (100A) that comprises a piezo-electric element (102), a capacitor (106) of a predefined capacitance configured parallel to the sounder circuit (100A), wherein the sounder circuit (100A) is connected to the capacitor (106), and a power source (108) via a switch (110). The sounder device (100) further comprises a controller (112) that is configured to issue a voltage control signal to enable supply of electrical power from the power source (108) to the capacitor (106) to charge the capacitor (106) to a predetermined voltage, and issue a first switching control signal to control switching of the switch (110) at a predetermined duty cycle, to enable the capacitor (106) to supply the predetermined voltage across the sounder circuit (100A) at the predetermined duty cycle, wherein the sounder circuit (100A) is configured to generate acoustic signal of a predefined sound level and tone based on the predetermined voltage being supplied to the sounder circuit (100A) at the predetermined duty cycle.