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    32.
    发明专利
    未知

    公开(公告)号：FR2143133B1

    公开(公告)日：1973-07-13

    申请号：FR7222224

    申请日：1972-06-20

    Applicant: ELECTRONICS CORP AMERICA

    IPC: F23N5/08 ,  F23N5/24 ,  F23N5/00

    Abstract: The invention describes a fail safe voltage responsive circuit for producing an output level indicative of the relationship between two voltage levels. The voltage responsive circuit includes a fail-safe comparison circuit which assumes alternative modes in response to an alternating signal introduced into the comparison circuit when the voltage levels are within a predetermined range, one relative to the other. When the voltage levels are outside the range or if a component fails, the comparison circuit ceases to alternate between modes. The voltage responsive circuit is used in a preferred application involving a fail-safe combustion control system wherein one voltage level is used to supply bias current to a photoconductive cell, the cell sensing the presence or absence of flame.

    34.
    发明专利
    未知

    公开(公告)号：FR2115916A5

    公开(公告)日：1972-07-07

    申请号：FR7141729

    申请日：1971-11-22

    Applicant: ELECTRONICS CORP AMERICA

    IPC: F23N5/24 ,  F23N5/00 ,  G05B19/00

    Abstract: A burner control system includes a plurality of field indicators indicative of the status of components of the burner system, control logic responsive to the field indicators for control burner control signals, logic bypass c0ntrol and circuitry responsive to the logic bypass control for establishing the status of the control logic as a function of the field indicators so that the control logic is maintained in synchronism with the field indicators.

    35.
    发明专利
    未知

    公开(公告)号：DE2142222A1

    公开(公告)日：1972-03-02

    申请号：DE2142222

    申请日：1971-08-23

    Applicant: ELECTRONICS CORP AMERICA

    IPC: F23N5/08 ,  F23N5/24

    Abstract: A condition responsive system comprises a condition sensor for producing a fluctuating output signal having a predetermined frequency component in response to sensing of the condition to be detected, an output device arranged to assume a first state indicative of the presence of the condition being sensed when the sensor senses the condition and produces the fluctuating output signal and a second state indicative of the absence of the condition when the sensor does not produce the fluctuating output signal, and means responsive to the fluctuating output signal and connected in circuit between the sensor and the output device including an inductor for blocking signals of higher frequency than the frequency of the fluctuating output signal, a capacitor connected in series with the indicator for blocking signals of lower frequency than the frequency of the fluctuating output signal and a fail safe rectification circuit connected in circuit between the series combination of the capacitor and the inductor and the output device.

    36.
    发明专利
    未知

    公开(公告)号：BE771614A

    公开(公告)日：1971-12-31

    申请号：BE771614

    申请日：1971-08-20

    Applicant: ELECTRONICS CORP AMERICA

    Inventor： THOMSON E C

    IPC: F23N5/08 ,  F23N5/24 ,  F23N

    Abstract: A condition responsive system comprises a condition sensor for producing a fluctuating output signal having a predetermined frequency component in response to sensing of the condition to be detected, an output device arranged to assume a first state indicative of the presence of the condition being sensed when the sensor senses the condition and produces the fluctuating output signal and a second state indicative of the absence of the condition when the sensor does not produce the fluctuating output signal, and means responsive to the fluctuating output signal and connected in circuit between the sensor and the output device including an inductor for blocking signals of higher frequency than the frequency of the fluctuating output signal, a capacitor connected in series with the indicator for blocking signals of lower frequency than the frequency of the fluctuating output signal and a fail safe rectification circuit connected in circuit between the series combination of the capacitor and the inductor and the output device.

    IMPROVED COMBUSTION CONTROL CIRCUIT
    37.
    发明专利
    IMPROVED COMBUSTION CONTROL CIRCUIT 未知

    公开(公告)号：GB1255734A

    公开(公告)日：1971-12-01

    申请号：GB809469

    申请日：1969-02-14

    Applicant: ELECTRONICS CORP AMERICA

    IPC: F23N5/08 ,  F23N5/20

    Abstract: 1,255,734. Burner controls. ELECTRONICS CORP. OF AMERICA. 14 Feb., 1969 [18 March, 1968], No. 8094/69. Heading F4T. [Also in Division G1] In burner control apparatus comprising a relay 100 (contacts 100-1 to 100-3) for operating an igniter 34 and a relay 90 (contacts 90-1 to 90-4) controlled by a signal from an ultra-violet sensor 62 of the avalanche discharge type when flame is detected to operate a main fuel control 36, there is a delay between either (a) the time when the apparatus is initially turned on by applying a voltage to terminals 10, 12, Fig. 1, or (b) the time when heat demand is signalled by the closure of thermostat and limit switches 30a, 30b, Fig. 2, and the time at which the relay 100 is energized, so that a fault in the sensor, i.e. when it is in a continuously avalanching condition and indicates flame when no flame is present, causes a lock-out switch heater 102 to be energized to prevent further actuation of the apparatus and to operate an alarm 32. The heater 102 is in series with normally open and shut contacts 100-1 and 90-2 (100-A and 90-B), and with normally shut and open contacts 100-2 and 90-1(100-C and 90-E), so that the lock-out switch is actuated if relay 90 only is energized and also if relay 90 is not energized within a predetermined time after the energization of relay 100, e.g. due to non-effective ignition. In Fig. 1, a voltage at terminals 10, 12 energizes a transformer 16 and causes a heater 52 to close a switch 52-1 after a delay, and subsequent closure of a thermostat switch 30 energizes control relay 100 via a transformer 42, the contact 100-1 maintaining the relay 100 in an energized state until switch 30 is opened. Before switch 52-1 is shut, a signal from sensor 62 will open contact 90-2, isolating relay 100 and shut contact 90-1 to energize heater 102. If the sensor 62 is operating correctly and flame is established, the relay 90 operates contacts 90-3 and 90-4 to turn off the igniter 34 and operate the main fuel control 36. In Fig. 2, closure of switches 30a, 30b operates a blower and the air flow closes a switch 37 to energize transformer 42 1 . A D.C. signal is applied via the lock-out switch heater 102 1 to an R.C. network 122, 124, 126, 128 on the control electrode 120 of a unijunction transistor 112 and a bias is applied to electrode 116. After a delay the voltage on capacitor 128 causes the transistor to conduct, energizing relay 100 1 which is then held on via contact 100-A. A contact 100-B closes to operate an igniter 34 1 and pilot fuel supply 35. Subsequent energization of relay 90 1 closes contact 90-A to reset the R.C. network, i.e. short circuit the capacitor, opens contact 90-C to turn off the igniter, and closes contact 90-D for the main fuel supply. In both embodiments, the sensor 62 is continuously energized, and not only when operation is requested, so that it never attains a " soft " condition.

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