US3458730A - Monostable controlled rectifier switching circuit with variable impedance for low power dissipation and rapid recovery - Google Patents

Monostable controlled rectifier switching circuit with variable impedance for low power dissipation and rapid recovery Download PDF

Info

Publication number
US3458730A
US3458730A US555196A US55519666A US3458730A US 3458730 A US3458730 A US 3458730A US 555196 A US555196 A US 555196A US 55519666 A US55519666 A US 55519666A US 3458730 A US3458730 A US 3458730A
Authority
US
United States
Prior art keywords
rectifier
capacitor
circuit
variable impedance
monostable
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
US555196A
Other languages
English (en)
Inventor
Rodger L Gamblin
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.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
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 International Business Machines Corp filed Critical International Business Machines Corp
Priority to US555196A priority Critical patent/US3458730A/en
Priority to JP2006567A priority patent/JPS4424649B1/ja
Priority to FR8467A priority patent/FR1529740A/fr
Priority to GB21388/67A priority patent/GB1162745A/en
Priority to DEJ33818A priority patent/DE1283893B/de
Priority to NL6707674A priority patent/NL6707674A/xx
Application granted granted Critical
Publication of US3458730A publication Critical patent/US3458730A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/72—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region
    • H03K17/73—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region for dc voltages or currents
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/72—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region

Definitions

  • This invention relates generally to an improved circuit for driving resistive and inductive loads at relatively high current levels and which is particularly well adapted to driving electromechanical transducers such as the coils which are utilized to drive print hammers in impact printing apparatus.
  • Impact printing operations involve the movement of a mechanical element which contains a relatively high energy level. This movement is impulsive in nature, that is, it must be accelerated to a relatively high speed in a very short time. When this motion is impelled by an electromechanical transducer, the nature of the operation demands that high electrical power levels be employed in driving the transducer during the period of acceleration.
  • silicon-controlled rectifiers have been employed more and more in environments wherein they replace power transistors.
  • the silicon-controlled rectifiers are particularly advantageous because of significant advantages in both cost and size.
  • relatively low input power levels can switch high output power levels, thereby eliminating the need for poweringup stages.
  • the size and cost factors are even more enhanced.
  • a first silicon-controlled rectifier connected in series with the load impedance between the terminals of a suitable power supply.
  • a second silicon-controlled rectifier and a series impedance are connected across the power supply.
  • the anodes of the two rectifiers are coupled to each other through a 3,458,730- Patented July 29, 1969 "ice capacitor, the function of which is to turn off an energized rectifier when the other rectifier is initially turned on.
  • the impedance which is in series with the second rectifier is in the form of a transistor which provides a very high impedance when the circuit is in its inactive state and which provides a very low impedance for charging the capacitor during the cyclical energization of the monostable device.
  • the conductivity of the second rectifier is controlled by means of a second capacitor and its related charge and discharge circuits.
  • the improved monostable device includes a first siliconcontrolled rectifier 1 which is connected in series with a load impedance 2 between ground potential and a positive supply terminal 3.
  • a second silicon-controlled rectifier 4, a transistor 5 and an emitter resistor 6 are connected in series between ground potential and the supply terminal 3.
  • the anodes of the rectifiers 1 and 4 are connected to each other by way of a coupling capacitor 7.
  • the base electrode of the transistor 5 is connected to the anode of the rectifier 1 by way of a current limiting resistor 8.
  • the anode of the rectifier 4 is connected to ground potential by way of a voltage divider comprising resistors 10 and 11.
  • the junction between the latter resistors is connected to ground potential by way of a diode 12 and a capacitor 13.
  • the junction between the diode and capacitor is connected directly to the control electrode of the rectifier 4 and is also connected to the supply terminal 3 by way of a potentiometer 14 and a resistor 15.
  • the control electrode 16 of the rectifier 1 is connected to a source of turn-on pulses (not shown).
  • the operation of the monostable device is as follows.
  • the rectifier 1 is initially in its nonconductive state, whereby the positive potential at the terminal 3 is applied to the right-hand terminal of the capacitor 7.
  • a conductive path is established by way of resistors 11, 14 and 15 and diode 12.
  • the value of the resistor 11 is so small relative to the value of resistors 14 and 15 that there is substantially no voltage drop across the resistor 11.
  • the junction between the diode 12, capacitor 13 and the control electrode 4 will, therefore, be fixed at approximately a positive seven-tenths volt level (e.g. the diode drop), whereby the rectifier 4 is forward biased to its low impedance state.
  • the anode to cathode current flow is insignificantly small.
  • the left-hand terminal of the capacitor 7 is, therefore, at ground potential.
  • the transistor 5 is normally in its non-conducting state since the positive potential from the terminal 3 is applied to both its base and emitter electrodes.
  • the rectifier 1 When a positive pulse is applied to the input terminal 16, the rectifier 1 is turned on to energize the load 2. At the same time, the capacitor 7 applies a negative pulse to the junction between the transistor 5 and the rectifier 4,
  • This negative potential turns off the rectifier 4 and causes the capacitor 13 to be charged to a predetermined negative potential determined 'by the relative values of the resistors 10 and 11.
  • the capacitor 13 reverse biases the control electrode of the rectifier 4.
  • the transistor 5 is now forward biased and begins to conduct. Due to its low impedance, the transistor 5 will very rapidly charge the capacitor 7 substantially to the voltage difference between ground potential and the potential level at the terminal 3. During this time interval, the capacitor 13 will be charging positively by means of the charge circuit formed by the resistors 14 and 15, diode 12 being reverse biased.
  • the capacitor 7 is charged by way of the load impedance 2; and, when the voltage level at the anode of the rectifier 1 reaches a level substantially equal to that at the supply terminal 3, transistor 5 is turned off. With the transistor 5 nonconducting, the anode circuit of the rectifier 4 is interrupted except for the small current flow through the resistors 10 and 11; and the circuit adjusts itself to the initial state which existed before the rectifier 1 was turned on.
  • nonlinear impedance i.e. transistor 5
  • the resistors 10, 11, 14 and 15, the diode 12 and the capacitor 13 can be removed; and rectifier 4 can be turned on when desired by an external pulse source.
  • a circuit for energizing a load with high energy pulses of short time duration of the type:
  • first and second silicon-controlled rectifiers are connected for sequential energization to momentarily energize the load over a series path including the first rectifier
  • means including a capacitor coupled to similar electrodes of the rectifiers, is effective to apply a turn-off pulse to each rectifier incident to the initial turn-on of the other rectifier
  • variable impedance element in series with the second rectifier and connected for operation in its high impedance state while the first rectifier is nonconducting to minimize power drain through the second rectifier, and for operation in its low impedance state while the first rectifier is conducting for rapidly conditioning the capacitor for subsequent turning off of the latter rectifier.
  • variable impedance element comprises:
  • a transistor switch having its base-emitter electrodes connected in series with the first rectifier and having its collector electrode connected to the second rectifier and the capacitor.
  • a monostable circuit comprising:
  • a power supply having first and second terminals
  • the first rectifier adapted to respond to input signals for switching to a highly conductive state to energize the load element
  • third means including the capacitor responsive to switching of the first rectifier for rendering the latter means effective
  • variable impedance element means causing the variable impedance element to switch from a high to a low value in response to switching of the first rectifier to its highly conductive state and rapidly charge the capacitor to a desired value prior to switching of the second rectifier to its highly conductive state
  • variable impedance thereafter switching to a high value to inhibit significant current flow through the second rectifier.
  • variable impedance comprises:
  • a transistor switch having its base-emitter electrodes connected in series with the first rectifier between the supply terminals and having its collector electrode connected to the second rectifier and the capacitor.
  • the second means comprises an integrating circuit including a second capacitor and resistance means
  • the third means includes a voltage divider connected to the first-mentioned capacitor and a diode connecting an intermediate junction of the voltage divider to the second capacitor.

Landscapes

  • Impact Printers (AREA)
  • Dc-Dc Converters (AREA)
  • Electronic Switches (AREA)
US555196A 1966-06-03 1966-06-03 Monostable controlled rectifier switching circuit with variable impedance for low power dissipation and rapid recovery Expired - Lifetime US3458730A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US555196A US3458730A (en) 1966-06-03 1966-06-03 Monostable controlled rectifier switching circuit with variable impedance for low power dissipation and rapid recovery
JP2006567A JPS4424649B1 (US08063081-20111122-C00044.png) 1966-06-03 1967-03-31
FR8467A FR1529740A (fr) 1966-06-03 1967-04-25 Circuit de commutation à redresseur commandé ayant une impédance variable pour une dissipation d'énergie faible et un redressement rapide
GB21388/67A GB1162745A (en) 1966-06-03 1967-05-09 Pulse Circuit
DEJ33818A DE1283893B (de) 1966-06-03 1967-06-02 Schaltkreis mit kurzen Schaltzeiten fuer ohmsche und induktive Verbraucherwiderstaende
NL6707674A NL6707674A (US08063081-20111122-C00044.png) 1966-06-03 1967-06-02

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US555196A US3458730A (en) 1966-06-03 1966-06-03 Monostable controlled rectifier switching circuit with variable impedance for low power dissipation and rapid recovery

Publications (1)

Publication Number Publication Date
US3458730A true US3458730A (en) 1969-07-29

Family

ID=24216345

Family Applications (1)

Application Number Title Priority Date Filing Date
US555196A Expired - Lifetime US3458730A (en) 1966-06-03 1966-06-03 Monostable controlled rectifier switching circuit with variable impedance for low power dissipation and rapid recovery

Country Status (6)

Country Link
US (1) US3458730A (US08063081-20111122-C00044.png)
JP (1) JPS4424649B1 (US08063081-20111122-C00044.png)
DE (1) DE1283893B (US08063081-20111122-C00044.png)
FR (1) FR1529740A (US08063081-20111122-C00044.png)
GB (1) GB1162745A (US08063081-20111122-C00044.png)
NL (1) NL6707674A (US08063081-20111122-C00044.png)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3566157A (en) * 1968-07-16 1971-02-23 Westinghouse Air Brake Co Load driving circuit employing a control gate to prevent overloading
US3867651A (en) * 1973-09-28 1975-02-18 Rca Corp Monostable switching circuit
US3941034A (en) * 1974-07-11 1976-03-02 Carl Helwig Filter attachment for automobile passenger compartment air intake

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4591762A (en) * 1983-05-31 1986-05-27 Olympus Optical, Co. Electronic flash

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3193733A (en) * 1962-09-27 1965-07-06 Veeder Root Inc Counter driving circuit
US3231812A (en) * 1961-02-10 1966-01-25 Gen Electric Co Ltd Electric circuits for controlling the supply of electric current to a load
US3238418A (en) * 1962-06-25 1966-03-01 Gen Electric Electrical protective circuit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3231812A (en) * 1961-02-10 1966-01-25 Gen Electric Co Ltd Electric circuits for controlling the supply of electric current to a load
US3238418A (en) * 1962-06-25 1966-03-01 Gen Electric Electrical protective circuit
US3193733A (en) * 1962-09-27 1965-07-06 Veeder Root Inc Counter driving circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3566157A (en) * 1968-07-16 1971-02-23 Westinghouse Air Brake Co Load driving circuit employing a control gate to prevent overloading
US3867651A (en) * 1973-09-28 1975-02-18 Rca Corp Monostable switching circuit
US3941034A (en) * 1974-07-11 1976-03-02 Carl Helwig Filter attachment for automobile passenger compartment air intake

Also Published As

Publication number Publication date
NL6707674A (US08063081-20111122-C00044.png) 1967-12-04
JPS4424649B1 (US08063081-20111122-C00044.png) 1969-10-18
DE1283893B (de) 1968-11-28
GB1162745A (en) 1969-08-27
FR1529740A (fr) 1968-06-21

Similar Documents

Publication Publication Date Title
US3271700A (en) Solid state switching circuits
US3020418A (en) Transistorized storage registerindicator circuit
US3206612A (en) Signal time comparison circuit utilizing ujt characteristics
US3193701A (en) Monostable flip-flop consuming current only during pulse forming
US3588525A (en) Chattering preventing circuit
US3121802A (en) Multivibrator circuit employing transistors of complementary types
US3324306A (en) Switch-operable bistable multivibrator unaffected by contact bounce
EP0158903B1 (en) Capacitive load driving device
US3458730A (en) Monostable controlled rectifier switching circuit with variable impedance for low power dissipation and rapid recovery
US3381144A (en) Transistor switch
US3374366A (en) Complementary regenerative switch
US3065360A (en) Transistor thyratron circuit employing grounded-emitter silicon controlled rectifieror equivalent
US2644894A (en) Monostable transistor circuits
US3391306A (en) Solenoid power amplifier
US3104331A (en) Delay pulse generator
US2899553A (en) horton
US3315101A (en) Sawtooth sweep generator with negligible recovery time
US3214606A (en) Retentive memory bistable multivibrator circuit with preferred starting means
US3008088A (en) Synchronized multivibrator with selectable clamping means for rendering it inoperative
US3225220A (en) Logic circuit using storage diodes to achieve nrz operation of a tunnel diode
US3660690A (en) Electrical adjustment of time-constant apparatus
US3234400A (en) Sense amplifier with tunnel diode for converting bipolar input to two level voltage logic output
US2953695A (en) Gating circuits
US3192401A (en) Transistor pulse generating circuit of alternately opposite polarities
US3115584A (en) Self-resetting negative resistance diode inverter circuit