Boiler Burner Control Using Analog Timer Thresholds
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Solution Overview
Problem
Conventional hot water boiler control systems require outdoor temperature sensors and complex digital data processors to reduce boiler temperatures, leading to increased costs and potential temperature runaway conditions, which are inefficient and environmentally harmful.
Innovation Solution
An electronic control circuitry that automatically adjusts boiler temperature based on circulator activation time without outdoor sensors, utilizing an analog up/down timer circuit and dual temperature sensing, along with fault detection and multiple burner ignition relays to enhance reliability and prevent runaway conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If outdoor temperature sensors and complex digital data processors are used to reduce boiler temperatures, then boiler temperature control efficiency is improved, but device complexity and cost increase
Solution Approach 1:
The boiler control system uses its existing internal temperature sensors and circulator activation patterns to automatically adjust the boiler temperature setpoint, eliminating the need for external outdoor temperature sensors. The system serves itself by utilizing already-available data (circulator run time and internal temperature readings) to make temperature adjustments, thereby improving control efficiency without increasing device complexity
Solution Approach 2:
The patent replaces complex digital data processing systems with a simpler analog or microcontroller-based system that uses basic timing and temperature comparison logic. Instead of requiring sophisticated algorithms and outdoor sensors, the system uses the circulator activation time as a proxy for outdoor temperature conditions, substituting mechanical/electrical timing mechanisms for complex digital processing
2Loss of energy
If outdoor temperature sensors and complex digital data processors are used to reduce boiler temperatures, then fuel consumption is reduced, but cost increases
Solution Approach 1:
The system utilizes existing components (temperature sensors, circulator, timer) to automatically reduce boiler temperature setpoints based on circulator activation patterns, eliminating the need for expensive outdoor temperature sensors and complex digital processors. This self-service approach achieves fuel savings while avoiding additional manufacturing costs
Solution Approach 2:
The patent employs simple, inexpensive timing and temperature comparison logic rather than expensive digital processing systems. The solution uses basic electronic components that are cheap and reliable, achieving the same fuel reduction effect without the high cost of sophisticated sensors and processors
3Reliability
If high boiler temperatures are maintained, then comfortable room temperatures are ensured under cold outdoor conditions, but heat loss and fuel usage increase
Solution Approach 1:
The system dynamically adjusts the boiler temperature setpoint based on real-time circulator activation patterns. When the circulator runs frequently (indicating cold outdoor conditions), the boiler maintains high temperature to ensure comfort. When the circulator runs less frequently (warmer conditions), the boiler temperature setpoint is automatically reduced, thereby reducing heat loss and fuel consumption while maintaining reliable comfort assurance
Solution Approach 2:
The system uses feedback from the circulator activation pattern and internal temperature sensor readings to continuously adjust the boiler temperature setpoint. This closed-loop control ensures that the boiler temperature is optimized for current conditions, providing comfortable room temperatures when needed while minimizing heat loss and fuel usage when outdoor conditions permit
4Reliability
If dual temperature sensing and fault detection are implemented, then reliability is enhanced, but device complexity increases
Solution Approach 1:
The patent combines dual temperature sensing and fault detection functionality into the existing control system using simple comparison logic. The system monitors both the boiler water temperature sensor and the temperature sensor in thermal communication with the boiler, using basic threshold comparisons to detect faults. This merging of functions enhances reliability without requiring separate complex detection systems
Solution Approach 2:
The fault detection system replaces complex diagnostic algorithms with simple temperature differential comparisons. By monitoring the difference between two temperature sensors, the system can detect faults (such as sensor failures or abnormal temperature gradients) using basic arithmetic logic, thereby enhancing reliability without increasing device complexity
Data Source
AI summary
An apparatus comprises a sensor circuit configured to detect activation of at least one circulator arranged to circulate liquid from a boiler through at least one circulation loop and back to the boiler. An analog up/down timer circuit has an input coupled to an output of the sensor circuit and generates a variable threshold signal that varies as a function of an activation time of the at least one circulator. A burner control circuit receives the variable threshold signal from the analog up/down timer circuit and generates an ignition control signal based at least in part on comparison of a temperature sensor signal of the boiler with the variable threshold signal. An ignition driver receives the ignition control signal from the burner control circuit and generates an ignition signal for a burner configured to burn fuel to heat the liquid in the boiler based at least in part on the ignition control signal.