초록 ▼

A flame safeguard control system using a microcomputer is disclosed. The microcomputer responds to the flame signal as provided from a normal flame amplification chain and an analog-to-digital converter. A safety backup circuit in the form of a redundant flame signal detection circuit analyzes the a

A flame safeguard control system using a microcomputer is disclosed. The microcomputer responds to the flame signal as provided from a normal flame amplification chain and an analog-to-digital converter. A safety backup circuit in the form of a redundant flame signal detection circuit analyzes the analog signal being provided to the analog-to-digital converter. In the event that the microcomputer is unable to shut the main fuel valve off, the redundant flame detection circuit becomes operative to deenergize part of a series circuit including the relay for the main fuel valve.

대표청구항 ▼

A control system for processing a flame responsive output signal to insure cut-off control of main fuel valve means, including: a microcomputer flame safeguard control system adapted to operate a fuel burner including main fuel valve means; said flame safeguard control system including a flame senso

A control system for processing a flame responsive output signal to insure cut-off control of main fuel valve means, including: a microcomputer flame safeguard control system adapted to operate a fuel burner including main fuel valve means; said flame safeguard control system including a flame sensor adapted to respond to flame at said fuel burner; flame amplifier means having input means connected to said flame sensor and output means providing an analog signal representative of flame at said fuel burner; analog-to-digital converter means having input means connected to receive said analog signal from said flame amplifier means, and having output means connecting a digital signal to said microcomputer to provide said microcomputer with a digital signal representative of flame at said fuel burner; said microcomputer having output means connected to said fuel valve means to control the energization of said fuel valve means; redundant flame signal detection circuit means having input means connected to said analog signal representative of flame at said fuel burner; said redundant flame signal input means further including a reference voltage; said redundant flame signal detection circuit means including amplifier means comparing said reference voltage and said analog signal; said redundant flame signal detection circuit means having switched output means connected in a series circuit with said microcomputer output means to redundantly control the energization of said fuel valve means; and voltage divider network means having an input connected to said series circuit and an output connected to said microcomputer to supply said microcomputer with a signal representative of the state of operation of said redundant flame signal detection circuit means; said fuel valve means being capable of being deenergized by the operation of said microcomputer output means, or the operation of said redundant flame signal detection circuit means.