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1. US20200208838 - Leakage detection in a flame sense circuit

Office
United States of America
Application Number 16692026
Application Date 22.11.2019
Publication Number 20200208838
Publication Date 02.07.2020
Grant Number 10935237
Grant Date 02.03.2021
Publication Kind B2
IPC
F23N 5/12
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
23COMBUSTION APPARATUS; COMBUSTION PROCESSES
NREGULATING OR CONTROLLING COMBUSTION
5Systems for controlling combustion
02using devices responsive to thermal changes or to thermal expansion of a medium
12using ionisation-sensitive elements, i.e. flame rods
F23N 5/24
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
23COMBUSTION APPARATUS; COMBUSTION PROCESSES
NREGULATING OR CONTROLLING COMBUSTION
5Systems for controlling combustion
24Preventing development of abnormal or undesired conditions, i.e. safety arrangements
CPC
F23N 5/24
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
23COMBUSTION APPARATUS; COMBUSTION PROCESSES
NREGULATING OR CONTROLLING COMBUSTION
5Systems for controlling combustion
24Preventing development of abnormal or undesired conditions, i.e. safety arrangements
F23N 5/123
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
23COMBUSTION APPARATUS; COMBUSTION PROCESSES
NREGULATING OR CONTROLLING COMBUSTION
5Systems for controlling combustion
02using devices responsive to thermal changes or to thermal expansion of a medium
12using ionisation-sensitive elements, i.e. flame rods
123using electronic means
F23N 2227/00
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
23COMBUSTION APPARATUS; COMBUSTION PROCESSES
NREGULATING OR CONTROLLING COMBUSTION
2227Ignition or checking
F23N 2229/00
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
23COMBUSTION APPARATUS; COMBUSTION PROCESSES
NREGULATING OR CONTROLLING COMBUSTION
2229Flame sensors
F23N 2231/00
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
23COMBUSTION APPARATUS; COMBUSTION PROCESSES
NREGULATING OR CONTROLLING COMBUSTION
2231Fail safe
F23N 2237/00
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
23COMBUSTION APPARATUS; COMBUSTION PROCESSES
NREGULATING OR CONTROLLING COMBUSTION
2237Controlling
Applicants Honeywell International Inc.
Inventors Jan Vorlicek
Jiri Kastan
John Evers
Title
(EN) Leakage detection in a flame sense circuit
Abstract
(EN)

A flame detection system is designed to detect leakage in flame sense circuits. The flame detection system includes a flame sensor, an amplifier, a detection circuit, and a microcontroller. Flame sense circuitry use operational amplifiers that needs negative voltage supply for its operation. Negative supply voltage properly measures negative input signals. Once a leakage current in the flame detection system is determined a shutdown signal is provided to shut down a flame sensor when the leakage current condition is determined.


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