US2463318A - Electronic time delay circuit - Google Patents

Electronic time delay circuit Download PDF

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Publication number
US2463318A
US2463318A US548164A US54816444A US2463318A US 2463318 A US2463318 A US 2463318A US 548164 A US548164 A US 548164A US 54816444 A US54816444 A US 54816444A US 2463318 A US2463318 A US 2463318A
Authority
US
United States
Prior art keywords
voltage
circuit
capacitor
resistor
valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US548164A
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English (en)
Inventor
Elbert D Schneider
Chin Pao-Hsiung
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to BE481324D priority Critical patent/BE481324A/xx
Priority to FR959966D priority patent/FR959966A/fr
Application filed by General Electric Co filed Critical General Electric Co
Priority to US548164A priority patent/US2463318A/en
Priority to GB19402/45A priority patent/GB634774A/en
Application granted granted Critical
Publication of US2463318A publication Critical patent/US2463318A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/28—Modifications for introducing a time delay before switching
    • H03K17/288—Modifications for introducing a time delay before switching in tube switches

Definitions

  • Our invention relates to electric valve circuits and more particularly to improved electric valve circuits for effecting a circuit controlling operation with a predetermined time delay.
  • a new and improved alternating current electronc time delay relay in which a timing capacitor is charged through the grid-to-cathode circuit of a high vacuum discharge device of the pentode type, and in which the interval of time delay is initiated by closure of a switch in the cathode lead of the discharge device, the device being maintained substantially non-conducting for an interval determined by the discharge of the capacitor through a parallel resistor.
  • a voltage divider connected across the alternating current supply circuit determines the level of voltage to which the timing capacitor is charged and also provides an alternating current component of voltage for biasing the control grid of the discharge device and for energizing the screen grid of the discharge device.
  • a voltage regulating or glow discharge tube is connected across a portion of the voltage divider to regulate the volt age to which the timing capacitor charges and to provide fiat topped alternating voltages having a predetermined maximum amplitude for energizing the screen grid and for the alternating current bias of the control grid.
  • FIG. 1 is a schematic representation of one embodiment of our invention
  • Fig. 2 is a schematic representation of another embodiment of our invention
  • Fig. 3 is a schematic representation of still another modification.
  • Fig. 1 of the drawing we have shown our invention embodied in a circuit for energizing the operating coil l of an electromagnetic relay 2 at the end of a predetermined interval of time after the closure of an initiating switch 3.
  • Energization of the operating coil I from an alternating current supply circuit 4 is controlled by the conduction of an electric discharge device 6 which, in the preferred form shown in the drawing, is a high vacuum valve of the pentode type having an anode 'l, a cathode 8, a control member or grid 9, a screen grid 10 and a suppressor grid ii.
  • the cathode of the electric valve 6 is connected with one of the alternating current supply lines 4 through the initiating switch 3, and the anode l is connected with the other alternating current supply line through the operating coil 1 of the relay 2.
  • a resistor I2 and capacitor iii are connected in series and across the terminals of the operating coil to provide an energy storage circuit for maintaining the operating coil l energized during alternate half cycles of the supply circuit voltage during which the electric valve 6 is nonconducting.
  • a voltage divider including resistors i i-ll, inclusive is connected across the alternating current supply 4.
  • the control member or grid 9 is connected with an adjustable point on resistor [6 by a movable contact l3 through a circuit including a timing capacitor is and a parallel connected discharge resistor 29.
  • the screen grid 10 of the discharge device 5 is maintained at a voltage intermediate the common terminal of resistors i4 and i5 and to the lower alternating current supply line 1 by a voltage dividing circuit including a series connected resistor 2
  • the screen grid is connected to the common terminal of resistor 2i and capacitor 22.
  • This circuit impresses a voltage on the screen grid which is slightly lagging in phase with respect to the voltage impressed on the voltage divider including resistors i l-ll, inclusive. This voltage relation has been found desirable as contributing to the consistent operation of the timer.
  • a resistor 23 is connected from the cathode of the electric valve 5 to a point of voltage between the voltage dividing resistor 15 and the upper terminal or resistor M and, as illustrated, is connected to the juncture of resistors l4 and 15.
  • a voltage regulating device such as a glow discharge valve 24 having a predetermined of resistor l6.
  • the device 24 serves to regulate the voltage to which the capacitor 59 is charged, as well as to provide flat topped alternating voltages of predetermined regulated amplitude on the control grid -9 and the screen grid IE. Since the characteristics of the pentode valve 6 are such that the current conducted is substantially independent of supply line voltage fluctuations when the voltage of the screen grid is maintained constant, this combination makes it unnecessary to regulate the anode voltage of valve 9 and in this way minimizes the currentcarrying duty imposed on regulating valve 24.
  • the relay 2 may be employed to control any desired number of circuits and, as illustrated, is provided with a normally open contact 25 and a normally closed contact 26 connected in circuit with load conductors 21 and 28, respectively.
  • a charging circuit for the capacitor 19 is established across the portion of the voltage divider of which the voltage is regulated by the glow discharge device 24.
  • This charging circuit is traced from the lower conductor 4 through resistor ll, lower portion of potentiometer l8, capacitor iii-resistor 20 network, grid S-cathode B path, resistor 23 to junction of resistors I4 and i5.
  • the capacitor charges, with the plate nearest control grid 9 negative, to a Voltage determined by the voltage of the common terminal of resistors 14 and [5. Since this voltage is regulated by the gaseous discharge device 24,
  • the voltage to which the timing capacitor I9 is charged is also regulated. During this time the anode-cathode voltage impressed on the discharge valve 6 is that appearing across resistor 14. This is insufiicient to pick up the relay 2 and as a result the relay remains deenergized as long as the initiating switch 3 is open.
  • the anode-cathode circuit of "discharge device 6 is connected across the alternating current supply conductors 3 and the gridto-cathode circuit of the valve is completed to include an alternating current bias voltage appearing across resistor IT and the lower portion
  • This voltage is substantially in phase with the anode-cathode voltage impressed on the discharge device 6 and is of flat topped wave form due to the connection of the glow discharge device 24 across voltage dividing resistors IE-ll, inclusive.
  • the magnitude of the alternating current bias may be adjusted by adjusting the slider on resistor ll. This bias voltage is opposed by the transient voltage of the timing capacitor H] which is not further charged after closure of initiating switch 3 and which continues to discharge through resistor 26.
  • the voltage of capacitor l9 reduces to the point where the valve 6 conducts sufficiently to pick up the relay 2.
  • the flat topped alternating bias voltage is regulated by discharge device 24 and the voltage to which capacitor I9 is charged is regulated by this discharge device so that the time required for the voltage of control member 9 to reach a predetermined value is independent of supply line voltage fluctuations.
  • the current conducted by the device is substantially independent of the anode-cathode voltage. Therefore, the interval or" time required for actuation 0t relay 2 is substantially independent of supply line voltage fluctuations with the regulating arrangement disclosed in Fi 1.
  • the phase of the voltage of the screen grid is retarded with respect to the plate voltage of valve 6. It has been found that this shirt in phase of the screen grid voltage increases the consistency of the timing operation with variable supply voltage.
  • Fig. 2 we have illustrated a modification of our invention which is in general similar to the arrangement of Fig. 1, but in which the relay is normally in its actuated position and is deenergized for a predetermined interval upon closure of the initiating switch. When the relay is reset by opening of the initiating switch, the relay is again energized.
  • elements corresponding to elements of Fig. 1 have been designated by the same reference numerals. It will be noted that in Fig.
  • the resistor 23 has been omitted and that the initiating switch is not connected in the cathode lead of the valve 6, but rather in circuit with the Voltage dividing resistors i l-ll between the resistor l1 and the alternating current supply conductor 6 which is connected with the cathode of the discharge device 6.
  • the initiating switch has been designated 3'.
  • Fig. 3 The arrangement shown in Fig. 3 is similar to that illustrated in Fig. 2 but the relay is operated in accordance with the conduction of a gaseous discharge amplifier valve controlled by the valve '5.
  • numerals corresponding to those nected through the relay coil 1 and the parallel resistor and capacitors l2 and 13, respectively, to the juncture of voltage dividing resistor l1 and the initiating switch '3'.
  • the electric valve 29 is preferably of the gaseous discharge type and is provided with a control member v30 connected "to'the anode'circuit of the electric valve '6 through a current limiting resistor 31.
  • a suitable filter capacitor 32 is connected between the control member and cathode of the valve 29.
  • a parallel connected resistor 33 and capacitor are connected in the anode circuit of electric valve 6 in place of the relay coil i and its parallel connected capacitor it.
  • an alternating current supply circuit a voltage divider connected across said supply circuit, an electric valve of the high vacuum type including an anode, a cathode, and a control grid, a screen grid, a capacitor, means for charging said capacitor from a portion of the voltage of said voltage divider including the internal control grid-to-cathode circuit of said electric valve, means including an initiating switch operable to its open position to interrupt the external control grid-to-cathode circuit of said valve and operable to its closed position to complete said external circuit and to include said capacitor and a portion of said voltage divider to control conduction by said electric valve in accordance with the transient voltage of said capacitor, voltage regulating means connected across a portion of said voltage divider to regulate the voltage to which said capacitor charges and to provide a fiat topped voltage across the portion of said voltage divider connected in the external control grid-to-cathode circuit of said valve to render conduction by said electric valve substantially independent of voltage variations of said supply circuit and means for supplying to said screen grid a periodically
  • a supply circuit a voltage divider connected across said supply circuit, an electric valve of the high vacuum type including an anode, a cathode, a screen grid and a control grid, means for connecting the anode-cathode circuit for energization from said supply circuit, a capacitor, means for establishing a charging circuit for said capacitor including at least a portion of said voltage divider, a discharge circuit for said capacitor, initiating means including a switch operable to its open position to interrupt the external control grid-to-cathode circuit of said valve and operable to its closed position to complete said external circuit to initiate a timing interval determined by the discharge of said capacitor, voltage regulating means including a glow discharge device connected across a portion of said voltage divider to regulate the voltage to which said capacitor charges and to regulate the voltage across the portion of the voltage divider included in the external control grid-tocathode circuit of said valve and means for supplying to said screen grid a periodically varying voltage having a lagging phase displacement with respect to the voltage of said control

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US548164A 1944-08-05 1944-08-05 Electronic time delay circuit Expired - Lifetime US2463318A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BE481324D BE481324A (en)) 1944-08-05
FR959966D FR959966A (en)) 1944-08-05
US548164A US2463318A (en) 1944-08-05 1944-08-05 Electronic time delay circuit
GB19402/45A GB634774A (en) 1944-08-05 1945-07-30 Improvements in and relating to electronic time delay circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US548164A US2463318A (en) 1944-08-05 1944-08-05 Electronic time delay circuit

Publications (1)

Publication Number Publication Date
US2463318A true US2463318A (en) 1949-03-01

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US548164A Expired - Lifetime US2463318A (en) 1944-08-05 1944-08-05 Electronic time delay circuit

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US (1) US2463318A (en))
BE (1) BE481324A (en))
FR (1) FR959966A (en))
GB (1) GB634774A (en))

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2516422A (en) * 1949-06-29 1950-07-25 Robotron Corp Control by capacitor discharge blocking
US2533369A (en) * 1948-09-04 1950-12-12 Westinghouse Electric Corp Electronic sequence timer
US2555343A (en) * 1949-02-09 1951-06-05 Nat Rubber Machinery Co Automatic control for tire building machines
US2567422A (en) * 1948-01-08 1951-09-11 Tennessee Coal Iron And Railro Sheet counter
US2573360A (en) * 1948-11-06 1951-10-30 Robotron Corp Electric valve sequenced multifunction timer
US2574618A (en) * 1947-02-14 1951-11-13 Photoswitch Inc Electronic timing device
US2590783A (en) * 1951-02-28 1952-03-25 Gen Electric Electronic time-delay system
US2597082A (en) * 1948-11-02 1952-05-20 Westinghouse Electric Corp Reverse plating timer
US2598996A (en) * 1945-05-28 1952-06-03 Telephone Mfg Co Ltd Electric carrier wave signaling system
US2608653A (en) * 1950-02-25 1952-08-26 Westinghouse Electric Corp Electronic low-energy relay apparatus
US2610300A (en) * 1951-08-07 1952-09-09 Wilson W Walton Flow control
US2611011A (en) * 1949-02-26 1952-09-16 Honeywell Regulator Co Electrical timing apparatus
US2616041A (en) * 1950-03-07 1952-10-28 Square D Co Nonrepeat control circuit
US2619591A (en) * 1948-09-30 1952-11-25 Westinghouse Electric Corp Low-frequency welding control
US2623168A (en) * 1950-03-17 1952-12-23 Westinghouse Electric Corp Heat control circuit
US2638566A (en) * 1951-02-16 1953-05-12 Square D Co Synchronizing system for electronic tubes
US2656461A (en) * 1951-03-10 1953-10-20 Weltronic Co Electrical timing apparatus
US2658141A (en) * 1951-01-20 1953-11-03 Jerome J Kurland Time delay circuits
US2668909A (en) * 1950-04-10 1954-02-09 Exposure timer for x-ray apparatus
US2677052A (en) * 1949-03-15 1954-04-27 Weltronic Co Electronic timing device
US2720612A (en) * 1945-12-13 1955-10-11 John L Leonard Electronic controller
US2723346A (en) * 1951-04-23 1955-11-08 Northrop Aircraft Inc Delayed switching circuit
US2750873A (en) * 1952-10-28 1956-06-19 King Seeley Corp Toaster timer
US2767351A (en) * 1952-04-11 1956-10-16 Werner A Gieseke Electronic control circuit
US2821670A (en) * 1955-02-11 1958-01-28 United Shoe Machinery Corp Electronic controls for cutting machines
US2994021A (en) * 1953-01-19 1961-07-25 Honeywell Regulator Co Servosystem for coupling shafts
US3496474A (en) * 1966-08-08 1970-02-17 Lloyd S Electronics Intern Time delayed cutoff for radios and the like

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2171347A (en) * 1937-07-24 1939-08-29 Gen Electric Time delay relay
US2203468A (en) * 1938-02-12 1940-06-04 Rca Corp Regulator for time delay circuits
US2216232A (en) * 1937-11-30 1940-10-01 Rca Corp Over-modulation alarm device
US2251263A (en) * 1937-09-28 1941-08-05 Dow Chemical Co Grafting substance
US2274158A (en) * 1940-04-13 1942-02-24 Penther Carl Joseph Timing device and method
US2301195A (en) * 1941-08-30 1942-11-10 Remington Arms Co Inc Measuring instrument
US2313918A (en) * 1938-12-13 1943-03-16 Brownlee Henry Herbertson Controlling mechanism for ironing machines
US2337905A (en) * 1941-07-23 1943-12-28 Gen Electric Time delay relay
US2359080A (en) * 1942-09-30 1944-09-26 Gen Electric Electric control circuit

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2171347A (en) * 1937-07-24 1939-08-29 Gen Electric Time delay relay
US2251263A (en) * 1937-09-28 1941-08-05 Dow Chemical Co Grafting substance
US2216232A (en) * 1937-11-30 1940-10-01 Rca Corp Over-modulation alarm device
US2203468A (en) * 1938-02-12 1940-06-04 Rca Corp Regulator for time delay circuits
US2313918A (en) * 1938-12-13 1943-03-16 Brownlee Henry Herbertson Controlling mechanism for ironing machines
US2274158A (en) * 1940-04-13 1942-02-24 Penther Carl Joseph Timing device and method
US2337905A (en) * 1941-07-23 1943-12-28 Gen Electric Time delay relay
US2301195A (en) * 1941-08-30 1942-11-10 Remington Arms Co Inc Measuring instrument
US2359080A (en) * 1942-09-30 1944-09-26 Gen Electric Electric control circuit

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2598996A (en) * 1945-05-28 1952-06-03 Telephone Mfg Co Ltd Electric carrier wave signaling system
US2720612A (en) * 1945-12-13 1955-10-11 John L Leonard Electronic controller
US2574618A (en) * 1947-02-14 1951-11-13 Photoswitch Inc Electronic timing device
US2567422A (en) * 1948-01-08 1951-09-11 Tennessee Coal Iron And Railro Sheet counter
US2533369A (en) * 1948-09-04 1950-12-12 Westinghouse Electric Corp Electronic sequence timer
US2619591A (en) * 1948-09-30 1952-11-25 Westinghouse Electric Corp Low-frequency welding control
US2597082A (en) * 1948-11-02 1952-05-20 Westinghouse Electric Corp Reverse plating timer
US2573360A (en) * 1948-11-06 1951-10-30 Robotron Corp Electric valve sequenced multifunction timer
US2555343A (en) * 1949-02-09 1951-06-05 Nat Rubber Machinery Co Automatic control for tire building machines
US2611011A (en) * 1949-02-26 1952-09-16 Honeywell Regulator Co Electrical timing apparatus
US2677052A (en) * 1949-03-15 1954-04-27 Weltronic Co Electronic timing device
US2516422A (en) * 1949-06-29 1950-07-25 Robotron Corp Control by capacitor discharge blocking
US2608653A (en) * 1950-02-25 1952-08-26 Westinghouse Electric Corp Electronic low-energy relay apparatus
US2616041A (en) * 1950-03-07 1952-10-28 Square D Co Nonrepeat control circuit
US2623168A (en) * 1950-03-17 1952-12-23 Westinghouse Electric Corp Heat control circuit
US2668909A (en) * 1950-04-10 1954-02-09 Exposure timer for x-ray apparatus
US2658141A (en) * 1951-01-20 1953-11-03 Jerome J Kurland Time delay circuits
US2638566A (en) * 1951-02-16 1953-05-12 Square D Co Synchronizing system for electronic tubes
US2590783A (en) * 1951-02-28 1952-03-25 Gen Electric Electronic time-delay system
US2656461A (en) * 1951-03-10 1953-10-20 Weltronic Co Electrical timing apparatus
US2723346A (en) * 1951-04-23 1955-11-08 Northrop Aircraft Inc Delayed switching circuit
US2610300A (en) * 1951-08-07 1952-09-09 Wilson W Walton Flow control
US2767351A (en) * 1952-04-11 1956-10-16 Werner A Gieseke Electronic control circuit
US2750873A (en) * 1952-10-28 1956-06-19 King Seeley Corp Toaster timer
US2994021A (en) * 1953-01-19 1961-07-25 Honeywell Regulator Co Servosystem for coupling shafts
US2821670A (en) * 1955-02-11 1958-01-28 United Shoe Machinery Corp Electronic controls for cutting machines
US3496474A (en) * 1966-08-08 1970-02-17 Lloyd S Electronics Intern Time delayed cutoff for radios and the like

Also Published As

Publication number Publication date
GB634774A (en) 1950-03-29
BE481324A (en))
FR959966A (en)) 1950-04-07

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