Damper Control System Using Thermopile and Capacitor
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Solution Overview
Problem
Flame-powered damper motor control systems in water heaters face issues with voltage regulation, leading to improper damper rotation due to varying supply voltage, and existing solutions consume excessive power or risk overshooting the desired position.
Innovation Solution
A damper control system utilizing a single thermopile combined with a large capacitor for energy storage, along with variable pulse-width modulation and end switches positioned to detect damper position accurately, to regulate motor power supply and prevent overshooting, eliminating the need for a parallel resistor and redundant end switches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If flame-powered control system is used to eliminate standby losses, then energy efficiency is improved, but supply voltage varies over a wider range causing improper damper rotation
Solution Approach 1:
The system pre-charges a capacitor during periods when damper actuation is not needed, storing electrical energy in advance. When damper actuation is required, the capacitor provides the necessary power, eliminating the need for real-time flame-powered voltage generation and ensuring stable operation despite voltage variations.
Solution Approach 2:
A capacitor is introduced as an intermediary energy storage device between the flame-powered thermopile and the damper motor. This intermediary smooths out voltage fluctuations by storing energy when available and releasing it when needed, decoupling the variable flame output from the motor's power requirements.
2Ease of operation
If end switches are used to remove current at desired position, then position control is simplified, but damper may overshoot and continue rotating to wrong position
Solution Approach 1:
The system uses feedback from the capacitor's charge state and damper position to modulate power delivery. By monitoring whether the capacitor is charging or discharging and combining this with position feedback from end switches, the system can determine damper movement direction and adjust power delivery to prevent overshooting, ensuring accurate positioning.
Solution Approach 2:
The system dynamically adjusts power delivery to the motor based on real-time conditions. By using PWM control and monitoring capacitor charge/discharge states alongside position feedback, the system adapts motor power delivery to match actual damper position and movement state, preventing overshoot while maintaining ease of control.
3Use of energy by moving object
If variable pulse width modulated signals are used to control electrical energy, then energy consumption is reduced, but precise control of motor power supply becomes more complex
Solution Approach 1:
The capacitor serves a dual function: it both stores energy and provides feedback about the system's power state. By monitoring whether the capacitor is charging or discharging, the system automatically gains information about power availability and damper movement direction, eliminating the need for additional complex sensing circuitry while enabling precise PWM control.
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
The system efficiently controls damper position with minimal energy consumption, ensuring precise positioning and reduced power usage, while maintaining safety and cost-effectiveness by using a single thermopile and eliminating redundant components.
Implementation Method 1
The present invention is a damper control system having energy efficient mechanisms. The invention may use a heat-to-electric power converter such as a thermopile.
Implementation Method 2
The invention may store the electric energy in a significantly large capacitor or other electrical storage device.
Data Source
AI summary
A damper control system having energy efficient mechanisms. The system may use a heat-to-electric power converter such as a thermopile. Heat may come from a pilot light used for igniting a flame for an appliance. The system may store electric energy in a storage module which could be a sufficiently large capacitor. The system may monitor the position of a damper in a vent or the like and provide start and stop movements of the damper using minimal energy. One way that the system may control electrical energy to a damper motor or another electrical mover of the damper is to use pulse width modulated signals.