GB1286372A - A low frequency oscillator - Google Patents

A low frequency oscillator

Info

Publication number
GB1286372A
GB1286372A GB01412/70A GB1141270A GB1286372A GB 1286372 A GB1286372 A GB 1286372A GB 01412/70 A GB01412/70 A GB 01412/70A GB 1141270 A GB1141270 A GB 1141270A GB 1286372 A GB1286372 A GB 1286372A
Authority
GB
United Kingdom
Prior art keywords
oscillator
terminals
controlled
winding
low frequency
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
Application number
GB01412/70A
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Publication of GB1286372A publication Critical patent/GB1286372A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/35—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar semiconductor devices with more than two PN junctions, or more than three electrodes, or more than one electrode connected to the same conductivity region
    • H03K3/352—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar semiconductor devices with more than two PN junctions, or more than three electrodes, or more than one electrode connected to the same conductivity region the devices being thyristors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
    • H02P23/10—Controlling by adding a dc current
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/26—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback
    • H03K3/28—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback
    • H03K3/281—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback using at least two transistors so coupled that the input of one is derived from the output of another, e.g. multivibrator
    • H03K3/282—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback using at least two transistors so coupled that the input of one is derived from the output of another, e.g. multivibrator astable
    • H03K3/2823—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback using at least two transistors so coupled that the input of one is derived from the output of another, e.g. multivibrator astable using two active transistor of the same conductivity type
    • H03K3/2825—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback using at least two transistors so coupled that the input of one is derived from the output of another, e.g. multivibrator astable using two active transistor of the same conductivity type in an asymmetrical circuit configuration

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Electronic Switches (AREA)
  • Control Of Ac Motors In General (AREA)
  • Control Of Direct Current Motors (AREA)

Abstract

1286372 Control of AC motors HITACHI Ltd 10 March 1970 [10 March 1969] 11412/70 Heading H2J [Also in Divisions H3-H5] To periodically vary the speed of a single phase induction motor 501, 502, its auxiliary winding 502 is shunted by a variable impedance comprising or controlled by a low frequency oscillator. The motor drives a fan and the object is to simulate natural wind. As shown, the oscillator 511 is connected via a surge absorber 525 across the D.C. terminals of a rectifier bridge 506 whose A.C. terminals are connected across the winding 502. In Fig. 9 (not shown) the D.C. terminals of the bridge are shunted by a thyristor which is controlled, via a diac connected to its trigger electrode, by the oscillator. In Fig. 10 (not shown) a triac is connected directly across the winding 502 and this is controlled by a diac connected to the A.C. side of the rectifier bridge, the oscillator being connected to the D.C. terminals. The oscillator comprises an astable multivibrator (see Division H3).
GB01412/70A 1969-03-10 1970-03-10 A low frequency oscillator Expired GB1286372A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1751769 1969-03-10

Publications (1)

Publication Number Publication Date
GB1286372A true GB1286372A (en) 1972-08-23

Family

ID=11946137

Family Applications (1)

Application Number Title Priority Date Filing Date
GB01412/70A Expired GB1286372A (en) 1969-03-10 1970-03-10 A low frequency oscillator

Country Status (4)

Country Link
US (1) US3696311A (en)
BR (1) BR7017354D0 (en)
DE (1) DE2011337B2 (en)
GB (1) GB1286372A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3860890A (en) * 1974-01-02 1975-01-14 Atomic Energy Commission Temperature stable rc oscillator
US3986144A (en) * 1975-06-16 1976-10-12 Joseph Russo Oscillator with blinking light emitting diode for ornamental ring
KR20050108640A (en) * 2004-05-12 2005-11-17 엘지전자 주식회사 Condenser running single-phase induction motor
FR2975446B1 (en) * 2011-05-16 2016-06-24 Bernard Perriere OPTIMIZED YIELD TURBINE

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3061742A (en) * 1959-12-28 1962-10-30 Gen Dynamics Corp Stable transistor frequency changer having a stable multivibrator with synchronizing pulse input
DE1160496B (en) * 1961-12-29 1964-01-02 Philips Patentverwaltung Astable multivibrator
US3253234A (en) * 1962-05-14 1966-05-24 Bell Telephone Labor Inc Free-running multivibrator using a single cross-coupling capacitor
GB1030824A (en) * 1964-03-16 1966-05-25 Philips Electronic Associated Improvements in and relating to transistor multivibrators

Also Published As

Publication number Publication date
DE2011337A1 (en) 1970-09-17
US3696311A (en) 1972-10-03
BR7017354D0 (en) 1973-01-16
DE2011337B2 (en) 1972-05-04

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee