US3725675A - Power sequencing control circuit - Google Patents

Power sequencing control circuit Download PDF

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Publication number
US3725675A
US3725675A US00128836A US12883671A US3725675A US 3725675 A US3725675 A US 3725675A US 00128836 A US00128836 A US 00128836A US 12883671 A US12883671 A US 12883671A US 3725675 A US3725675 A US 3725675A
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US
United States
Prior art keywords
circuit
transistor
voltage source
voltage
coupled
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
US00128836A
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English (en)
Inventor
R Olsen
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.)
Bull HN Information Systems Italia SpA
Bull HN Information Systems Inc
Original Assignee
Honeywell Information Systems Italia SpA
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
Application filed by Honeywell Information Systems Italia SpA filed Critical Honeywell Information Systems Italia SpA
Priority to US00128836A priority Critical patent/US3725675A/en
Priority to CA129,573A priority patent/CA985369A/en
Priority to GB197372A priority patent/GB1368686A/en
Priority to JP1777072A priority patent/JPS5632805B2/ja
Priority to FR7209841A priority patent/FR2132037B1/fr
Priority to DE19722215379 priority patent/DE2215379A1/de
Application granted granted Critical
Publication of US3725675A publication Critical patent/US3725675A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current 
    • G05F1/46—Regulating voltage or current  wherein the variable actually regulated by the final control device is DC
    • G05F1/56—Regulating voltage or current  wherein the variable actually regulated by the final control device is DC using semiconductor devices in series with the load as final control devices
    • G05F1/577—Regulating voltage or current  wherein the variable actually regulated by the final control device is DC using semiconductor devices in series with the load as final control devices for plural loads

Definitions

  • the control means 18 powered by the fll'St voltage and includes two 3,343,036 9/1967 Steen ..317/3l stages, a first for detecting a change of the second 3,475,061 10/1969 Steinkamp et a1 ..307/ 130 voltage and the second responsive to such change and 3,590,275 6/1971 Fisher ..307/252 B powered by the first voltage for generating a signal for 3,093,964 7/1963 Heme! disabling the current applied to the load. 3,227,942 1/1966 Bunch et al...
  • Prior Art In a core memory system, current through selection line circuits must not be allowed to flow unless all of the logic modules controlling these circuits are receiving enough supply voltage to function properly.
  • One method of protecting circuitry is to utilize a fuse together with mechanical relays so that upon failure of the fuse, the mechanical relays remove all other voltages, however, when a fuse opens circuits a finite amount of time elapses before other voltages are removed due to the release time of the mechanical relays used in such protection circuits.
  • Transistor control circuits have also been used in the prior art to remove one voltage in the event of failure of another voltage. Such a transistor circuit is shown in US. Pat. No. 3,122,646, patented Feb. 25, 1964.
  • a transistor, diode and resistive divider arrangement controls a first voltage in response to change of a second voltage.
  • the apparent requirement of a third voltage for suchcontrol is a disadvantage of such prior art circuit.
  • a circuit of the present invention detects a change in value of a first voltage and utilizes a second voltage to inhibit current produced from such second voltage.
  • a power sequencing control circuit which includes a first voltage for producing a current, a means for applying the current to a load, and a means for disabling the means for applying from supplying the current to the load in response to a first signal.
  • a control means is provided which includes a first circuit stage for producing a second signal in response to a change of a second voltage below a predetermined value and the control means further includes a second circuit stage coupled to the first circuit stage and the first-voltage for generating the first signal in response to the second signal.
  • a control circuit 10 is shown to receive a voltage V at terminal 33, a voltage V at terminal 35, and a utility voltage V at terminal 39.
  • VoltageV is shown as a separate voltage from voltage V, but it should be understood that voltage V may be the same voltage as voltage V,,, i.e., terminal 39 may be connected to terminal 33.
  • Control circuit 10 includes an output control terminal 37 which in the presence of voltage V generates a high level signal when voltage V,, is at its normal value and which generates a low level signal when voltage V falls below a predetermined value.
  • voltage V is utilized in a memory system to power an address register 12 and timing circuits 14 which receive address logic signals and timing logic signals respectively.
  • Voltage V is utilized to provide current through a current source 20 shown in its simplest form as a resistor, 28 to a current switch 26, to a load 18, and to circuit ground 22.
  • Voltage V also powers a current switch gate 24.
  • Current switch gate 24 and current switch 26 are shown in combination within dotted lines 16 which combination may be that circuit produced by Texas Instruments Incorporated, having a Model No. SN75324, and further identified as a monolithic integrated circuit memory driver.
  • Current switch gate 24 enables or disables current switch 26.
  • Current switch 26 is enabled when the outputs of address register 12, timing circuits 14 and control terminal 37 are a high level. The absence of either one of the three input signals'disables the memory selection lines or load 18 from receiving current from voltage V 3 via current source 20.
  • control circuit 10 of the invention includes a first stage comprised basically of a resistor 34 coupled at one end to terminal 33 and coupled at the other end to the base electrode 31 of transistor 30. Coupled to the first stage is a second circuit stage which basically includes a resistor 36 coupled at one end to terminal 35 and at the other end to base electrode 29 of transistor 32. The collector electrode of.
  • transistor 32 is coupled to the control terminal 37.
  • the operation of the control circuit 10 is as follows.
  • voltage V A is at its normal voltage level, for example 5 to 6 volts
  • transistor 30 is turned on.
  • Voltage V which for example may be approximately 14 to 15 volts, generates a current which passes through resistor 36 and which because of the turned on condition of transistor 30 allows such current to flow through the collector-emitter-path of transistor 30. Accordingly, transistor 32 does not receive sufficient base current and remains turned off.
  • the control terminal 37 thus provides a high signal level determined by the input characteristics of current switch gate 24 in the absence of the connection of resistor 42. Note that as discussed herein, signal level refers to either current or voltage levels. Thus assuming the presence of the other two inputs to current switch gate 24, the high signaltransistor 32, turning transistor 32 on.
  • Control circuit 10 may also include a resistor 42 coupled at one end to the control terminal 37 and the collector of transistor 32'and coupled at the other end to terminal 39 which is coupled to receive a utility voltage V which for example may be approximately 5 to 6 volts. As stated hereinbefore voltage V may be directly connected to terminal 33 which is adapted to receive voltage V The use of voltage V with resistor 42 enhances the circuit for noise immunity on the control terminal 37. Also shown is a Zener diode 38 which is coupled to one end of resistor 34 and at the other end to the base electrode 31 of transistor 30. Zener diode 38-is utilized to sharpen the voltage threshold at which the change in voltage V is detected. A resistor 40 is also shown connected to the base electrode 31 and to circuit ground 22.
  • Resistor 40 is utilized to set the bias current in Zener diode 38.
  • transistor 30 is turned on allowing current from terminal 35 to flow through resistor36. and transistor 30 to circuit ground 22. With transistor 30 turned on, transistor 32 is turned off thereby raising the signal level of control terminal 37 to voltage V When voltage V goes below the threshold value determined by resistors 34, 40 and .Zener diode 38, transistor 30 turns off, turning on transistor 32 lowering the signal at control terminal 37 thereby inhibiting current through load 18.
  • control circuit of the invention is powered by the same voltage which supplies current to the load utilized in the system. This voltage inhibits current flow therefrom in response to another voltage which is detected for change in state by the control circuit of the invention. It has also been seen that such control has been provided with few components, basically two transistors and one resistor. It can be seen that certain changes may be made to the control circuit of the invention without departing from the scope thereof. For example, the NPN transistors which are utilized with positive voltages may have been PNP transistors utilizedwith negative voltages.
  • a control circuit for a memory system which system includes addressing means and timing means powered by a second voltage source, current switch means powered by a first voltage source, said addressing means and said timing means coupled to enable said current switch means, and a memory selection line coupled to receive current by means of said current switch means and by means of said first voltage source, wherein said circuit is utilized for inhibiting said current in said selection line when said second voltage changes below a predetermined value, said circuit comprising:
  • C. means coupling said second circuit stage to said current switch means so that the presence of said second signal inhibits said current.
  • a memory system comprising:
  • first circuit means comprising:
  • timing means wherein said second voltage source provides power to said addressing means and said timing means
  • control circuit for inhibiting said current in said selection line when the value of said second voltage source changes by a predetermined amount, said control circuit comprising:
  • said second circuit stage includes a second transistor having'a base, a collector and an emitter 6 5.
  • a circuit as defined in claim 6 further comprising:
  • a circuit as defined in claim 5 further comprising: A. first resistive means coupled to receive said 5 second voltage source at one end and coupled at thedother end to Said first transistor base elec' transistor base electrode and said third voltage.
  • a circuit as defined in claim 6 further comprising a i il 533; sjgi gzg 2 1 23 253; l 0 third resistive means coupled at one end to said output 0 g e p terminal and at the other end to a fourth voltage. other end to said first transistor collector electrode 9

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Electronic Switches (AREA)
  • Direct Current Feeding And Distribution (AREA)
  • Continuous-Control Power Sources That Use Transistors (AREA)
  • Power Conversion In General (AREA)
  • Control Of Electrical Variables (AREA)
  • Dc Digital Transmission (AREA)
  • Safety Devices In Control Systems (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Static Random-Access Memory (AREA)
US00128836A 1971-03-29 1971-03-29 Power sequencing control circuit Expired - Lifetime US3725675A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US00128836A US3725675A (en) 1971-03-29 1971-03-29 Power sequencing control circuit
CA129,573A CA985369A (en) 1971-03-29 1971-12-07 Power sequencing control circuit
GB197372A GB1368686A (en) 1971-03-29 1972-01-14 Electrical control circuit
JP1777072A JPS5632805B2 (enrdf_load_stackoverflow) 1971-03-29 1972-02-22
FR7209841A FR2132037B1 (enrdf_load_stackoverflow) 1971-03-29 1972-03-21
DE19722215379 DE2215379A1 (de) 1971-03-29 1972-03-29 Steuerschaltung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00128836A US3725675A (en) 1971-03-29 1971-03-29 Power sequencing control circuit

Publications (1)

Publication Number Publication Date
US3725675A true US3725675A (en) 1973-04-03

Family

ID=22437215

Family Applications (1)

Application Number Title Priority Date Filing Date
US00128836A Expired - Lifetime US3725675A (en) 1971-03-29 1971-03-29 Power sequencing control circuit

Country Status (6)

Country Link
US (1) US3725675A (enrdf_load_stackoverflow)
JP (1) JPS5632805B2 (enrdf_load_stackoverflow)
CA (1) CA985369A (enrdf_load_stackoverflow)
DE (1) DE2215379A1 (enrdf_load_stackoverflow)
FR (1) FR2132037B1 (enrdf_load_stackoverflow)
GB (1) GB1368686A (enrdf_load_stackoverflow)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3861363A (en) * 1972-04-04 1975-01-21 Cav Ltd Control systems for engines
US4024417A (en) * 1975-04-03 1977-05-17 International Business Machines Corporation Integrated semiconductor structure with means to prevent unlimited current flow
US4036199A (en) * 1975-03-18 1977-07-19 Ducellier & Cie Device for protecting an ignition device for motor vehicles
US4151425A (en) * 1977-03-03 1979-04-24 International Business Machines Corporation Voltage sequencing circuit for sequencing voltages to an electrical device
US4236087A (en) * 1978-10-30 1980-11-25 Sperry Corporation Programmable bus driver isolation
US4266145A (en) * 1979-05-09 1981-05-05 Ncr Corporation Time dependent master reset
US4433390A (en) * 1981-07-30 1984-02-21 The Bendix Corporation Power processing reset system for a microprocessor responding to sudden deregulation of a voltage
US4439805A (en) * 1982-05-21 1984-03-27 Gte Automatic Electric Labs Inc. Low voltage protection circuit
US4481430A (en) * 1982-08-02 1984-11-06 Fairchild Camera & Instrument Corp. Power supply threshold activation circuit
US4607174A (en) * 1982-01-22 1986-08-19 Nippon Electric Co., Ltd. Voltage detection circuit using threshold as reference voltage for detecting input voltage
US4736116A (en) * 1986-05-16 1988-04-05 Denning Mobile Robotics, Inc. Power-up sequencing apparatus
US4754166A (en) * 1982-04-21 1988-06-28 Tokyo Shibaura Denki Kabushiki Kaisha Reset circuit for integrated injection logic
US5469101A (en) * 1993-11-30 1995-11-21 Hughes Aircraft Company Analog signal selection and summing circuit having multiplexing capability
US5563455A (en) * 1995-02-27 1996-10-08 Sun Microsystems, Inc. Method and apparatus for sequencing and controlling power distribution
US5949153A (en) * 1997-03-06 1999-09-07 Consolidated Natural Gas Service Company, Inc. Multi-engine controller
US8536909B1 (en) * 2012-03-27 2013-09-17 Hong Fu Jin Precision Industry (Wuhan) Co., Ltd. Power good signal generating circuit

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS578268Y2 (enrdf_load_stackoverflow) * 1973-11-27 1982-02-17
JPS5493351A (en) * 1977-12-30 1979-07-24 Matsushita Electric Works Ltd Timer
US4307455A (en) 1978-02-27 1981-12-22 Rockwell International Corporation Power supply for computing means with data protected shut-down
JPS5832535B2 (ja) * 1978-05-17 1983-07-13 富士電機株式会社 遅延回路
JPH04205992A (ja) * 1990-11-30 1992-07-28 Mitsubishi Electric Corp 入力バッファ回路，入出力バッファ回路及び携帯形半導体記憶装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3191073A (en) * 1963-03-14 1965-06-22 Lawrence K Mooney Threshold indicator
JPS4020070Y1 (enrdf_load_stackoverflow) * 1964-07-11 1965-07-13
FR1440099A (fr) * 1965-04-15 1966-05-27 Labo Cent Telecommunicat Perfectionnements aux mémoires à lecture destructive fonctionnant en mémoires semi-permanentes
US3412314A (en) * 1965-07-12 1968-11-19 Magnavox Co Cyclically regulated power supply

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3861363A (en) * 1972-04-04 1975-01-21 Cav Ltd Control systems for engines
US4036199A (en) * 1975-03-18 1977-07-19 Ducellier & Cie Device for protecting an ignition device for motor vehicles
US4024417A (en) * 1975-04-03 1977-05-17 International Business Machines Corporation Integrated semiconductor structure with means to prevent unlimited current flow
US4151425A (en) * 1977-03-03 1979-04-24 International Business Machines Corporation Voltage sequencing circuit for sequencing voltages to an electrical device
US4236087A (en) * 1978-10-30 1980-11-25 Sperry Corporation Programmable bus driver isolation
US4266145A (en) * 1979-05-09 1981-05-05 Ncr Corporation Time dependent master reset
US4433390A (en) * 1981-07-30 1984-02-21 The Bendix Corporation Power processing reset system for a microprocessor responding to sudden deregulation of a voltage
US4607174A (en) * 1982-01-22 1986-08-19 Nippon Electric Co., Ltd. Voltage detection circuit using threshold as reference voltage for detecting input voltage
US4754166A (en) * 1982-04-21 1988-06-28 Tokyo Shibaura Denki Kabushiki Kaisha Reset circuit for integrated injection logic
US4439805A (en) * 1982-05-21 1984-03-27 Gte Automatic Electric Labs Inc. Low voltage protection circuit
US4481430A (en) * 1982-08-02 1984-11-06 Fairchild Camera & Instrument Corp. Power supply threshold activation circuit
US4736116A (en) * 1986-05-16 1988-04-05 Denning Mobile Robotics, Inc. Power-up sequencing apparatus
US5469101A (en) * 1993-11-30 1995-11-21 Hughes Aircraft Company Analog signal selection and summing circuit having multiplexing capability
US5563455A (en) * 1995-02-27 1996-10-08 Sun Microsystems, Inc. Method and apparatus for sequencing and controlling power distribution
US5949153A (en) * 1997-03-06 1999-09-07 Consolidated Natural Gas Service Company, Inc. Multi-engine controller
US8536909B1 (en) * 2012-03-27 2013-09-17 Hong Fu Jin Precision Industry (Wuhan) Co., Ltd. Power good signal generating circuit
US20130257511A1 (en) * 2012-03-27 2013-10-03 Chun-Sheng Chen Power good signal generating circuit

Also Published As

Publication number Publication date
DE2215379A1 (de) 1972-10-05
FR2132037A1 (enrdf_load_stackoverflow) 1972-11-17
JPS4735738A (enrdf_load_stackoverflow) 1972-11-25
FR2132037B1 (enrdf_load_stackoverflow) 1976-10-29
CA985369A (en) 1976-03-09
GB1368686A (en) 1974-10-02
JPS5632805B2 (enrdf_load_stackoverflow) 1981-07-30

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