-
公开(公告)号：NL186194C
公开(公告)日：1990-10-01
申请号：NL7412077
申请日：1974-09-11
Applicant: ELECTRONICS CORP AMERICA
Abstract: A burner control system in which signals indicating the condition at various locations within the system are applied to a control circuit in the form of pulse trains, causing a continuous alternation of state of solid state switching elements therein. The system actuates a switch to open a fuel valve only when the level of the control circuit output signal is alternating, indicating that the said switching elements are operative. A comparison circuit compares the control circuit output signal with a signal denoting the condition of the fuel valve, to ensure proper operation of the fuel valve switch.
-
公开(公告)号：NL183314C
公开(公告)日：1988-09-16
申请号：NL7500081
申请日：1975-01-03
Applicant: ELECTRONICS CORP AMERICA
Abstract: 1459055 Burner control ELECTRONICS CORP OF AMERICA 23 Dec 1974 [11 Jan 1974] 55483/74 Heading F4T A burner control apparatus comprises a flame sensor 66 to produce a signal when a flame is present, lockout apparatus 42, 42-1, 42-2, for de-energizing the apparatus, a device 108, 108-1 for actuating fuel control means, a preignition timing interval circuit 144 and an ignition timing interval circuit 160 having a common capacitor 146 one of the timing intervals being a function of the charging of the capacitor and the other being a function of the discharging of the capacitor means 24 responsive to a request for burner operation to initiate an ignition sequence by actuating the timing circuit circuitry responsive to the actuated timing- circuit for energizing the control device at the end of the first timing interval, flame signal responsive circuitry 22 responsive to a signal from the flame sensor 66 to maintain the control device energized and means responsive to the end of the ignition timing interval to deenergize the control device and cause lockout apparatus 42, 42-1, 42-2, to lockout the burner control apparatus in the absence of the signal from the flame sensor. In operation, power is supplied through terminals 10, 12 to transformer 16 and thence to flame sensor 66. Call for burner switch 24 closes and the air flow from blower motor 28 is sensed to thus energize transformer 40 and a D.C. voltage appears at terminal 52 of full-wave rectifier 46. Capacitor 146 is uncharged and in the absence of a signal from circuit 22 transistors 98, 112 and 120 are non-conducting. Lockout switch actuator 42 is heated, pre-ignition delay capacitor 146 is charged to thus initiate charging of trial-forignition capacitor 162, and after a delay due to timing network 144, the ignition and pilot fuel are turned on 30, 32. A flame signal from circuitry 22 causes the ignition 32 to be turned-off and initiates main-fuel flow 34. If the flame signal is lost, contacts 110-2 are opened and the fuel supply is turned-off and contacts 108-1 are opened to prevent ignition or pilot-fuel flow. In a modification, the control circuitry between terminals 52, 54, Fig. 2 (not shown), is altered. In a further modification, terminals 300-, 302 are connected to a D.C. supply, which is energized in response to a call for burner, the onset of the ignition sequence being delayed by a switch 304.
-
公开(公告)号：DE3277702D1
公开(公告)日：1987-12-23
申请号：DE3277702
申请日：1982-08-04
Applicant: ELECTRONICS CORP AMERICA
Inventor： CADE PHILLIP JOSEPH
Abstract: A control circuit system of the type which continuously monitors its own performance so as to be self-checking, i.e., to produce a response whenever a system shows an absence of a condition being monitored or a change therein and also produces a response if the control system itself should become inoperative or otherwise malfunction, comprises: first and second sensor means (13, 14) for sensing the same event and generating signals which are comparable upon sensing the same event; signal comparing means (23) responsive to said signals from said first and second sensor means for generating a negation response in the absence of comparable signals and responsive to the presence of said comparable signals for generation comparison response; switching means (27) coupled to the output of said signal comparing means for alternately interrupting comparison of said signals in said comparison means in response to said comparison response and restoring comparison in response to said negation response; and utilization means (37) operable in response to the alternating operating of said switching means.
-
公开(公告)号：DE3360755D1
公开(公告)日：1985-10-17
申请号：DE3360755
申请日：1983-03-03
Applicant: ELECTRONICS CORP AMERICA
Inventor： BALA JOHN L , ROSWELL CHARLES R
-
公开(公告)号：CA1192982A
公开(公告)日：1985-09-03
申请号：CA422617
申请日：1983-03-01
Applicant: ELECTRONICS CORP AMERICA
Inventor： BALA JOHN L , BOSWELL CHARLES R JR
Abstract: A fail-safe device is disclosed for removing power from circuitry to be controlled upon the occurrence of an undesired operating condition. The device includes circuitry for generating a fail-safe signal that is normally within a predetermined frequency range unless there is an undesired operating condition. It also includes power control circuitry for supplying power to the circuitry to be controlled only when the fail-safe signal is within the predetermined frequency range. In a preferred embodiment, the circuitry for generating the fail-safe signal includes a programmable computer which regulates the circuitry to be controlled and which, unless there is an undesired operating condition, such as a failure of the computer, also generates a sequence of bits in which a predetermined pattern occurs at a known frequency. A comparator circuit compares this sequence of bits with the predetermined pattern and generates a variation in the fail-safe signal each time there is a match. In the preferred embodiment, the power control circuitry includes an electromechanical relay for supplying power to the circuitry to be controlled when that relay is turned on and relay actuating circuitry for keeping the relay turned on when the fail-safe signal is within the predetermined frequency range. The power control circuitry may also include latch-out circuitry for keeping the relay off once it has been turned off and reset circuitry for enabling the relay to be selectively turned on once it has been turned off.
-
Patent Agency Ranking
公开(公告)号：CA1173129A
公开(公告)日：1984-08-21
申请号：CA354866
申请日：1980-06-26
Applicant: ELECTRONICS CORP AMERICA
Inventor： WEINER NATHAN K , WEYMAN PETER J , KETCHUM DAVID D
Abstract: Method and apparatus for evaluating the quality of a flame in response to outputs from a flame sensor. The present invention includes a method and apparatus in which output pulses from a flame sensor are continuously counted. The number of pulses is accumulated over a time interval of a predetermined length and compared with a threshold value. The accumulated total is continuously updated to reflect the pulses received over the previous time interval to effectively provide a moving time-window of a fixed length over which pulses from the flame sensor are accumulated. Other additional checks may be made to ascertain that a flame is present, including the time over which no pulses are detected and a long-term average of the number of pulses. A preferred embodiment disclosed in which numerous self-checking features are incorporated, and which includes a novel bar-graph type of display for displaying flame quality and diagnostic information.
-
公开(公告)号：CH638603A5
公开(公告)日：1983-09-30
申请号：CH73680
申请日：1980-01-30
Applicant: ELECTRONICS CORP AMERICA
Inventor： CADE PHILLIP
-
公开(公告)号：GB2049960B
公开(公告)日：1983-03-09
申请号：GB8014433
申请日：1980-05-01
Applicant: ELECTRONICS CORP AMERICA
Abstract: An interface circuit for indicating the state of a set of switch contacts having high noise immunity and high reliability. The switch contacts to be monitored are connected in series with the primary winding of a transformer having a magnetic core with a highly rectangular hysteresis loop. A voltage is periodically applied through the switch to the transformer primary. A test pulse of current is then passed through a secondary winding on the transformer. The signal across the secondary winding produced in response to the test pulse current indicates the closed or opened condition of the contacts.
-
公开(公告)号：GB1596932A
公开(公告)日：1981-09-03
申请号：GB127078
申请日：1978-01-12
Applicant: ELECTRONICS CORP AMERICA
Abstract: Burner control apparatus includes control devices for actuating an ignition control means, and a timing circuit for providing an ignition timing sequence of four precise intervals. The timing circuit is actuated in response to a request for burner operation and the control devices are energized in sequence and combination in response to the actuated timing circuit. Time sequential pilot flame and main flame stabilization intervals are provided. If a signal from the flame sensor is received before the end of the overlapping flame stabilization timing intervals, the control device is energized and if flame detection signal is lost a lockout circuit is energized.
-
公开(公告)号：CA1101941A
公开(公告)日：1981-05-26
申请号：CA290065
申请日：1977-11-02
Applicant: ELECTRONICS CORP AMERICA
Inventor： THOMSON ELIHU C
Abstract: A two-terminal photodetector comprising a photodiode and a plurality of active and passive components connected so that when connected to a source of current the voltage across the terminals is proportional to the illumination and is proportional by an amplification factor to rapidly changing illumination levels. In one embodiment the photodetector includes a first transistor having the photodiode connected in the emitter base circuit and a feedback resistor connected in the base collector circuit. This transistor is biased such that it is nearly saturated. Illumination on the photodiode causes the collector voltage to rise correspondingly. An output transistor is connected with its base joined to the emitter of the first transistor and a voltage divider connected between its emitter and collector. The output transistor has only a unity gain for low frequency signals but the gain is considerably increased for high frequency signals corresponding to rapidly changing illumination.
-
-
-
-
-
-
-
-
-
Search Results
412
records
(took 0.029 seconds)
