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GB2018072A - Control circuit - Google Patents

Control circuit

Info

Publication number
GB2018072A
GB2018072A GB7907466A GB7907466A GB2018072A GB 2018072 A GB2018072 A GB 2018072A GB 7907466 A GB7907466 A GB 7907466A GB 7907466 A GB7907466 A GB 7907466A GB 2018072 A GB2018072 A GB 2018072A
Authority
GB
United Kingdom
Prior art keywords
circuit
resistor
triac
coupled
zero
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.)
Granted
Application number
GB7907466A
Other versions
GB2018072B (en
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 GB7907466A priority Critical patent/GB2018072B/en
Publication of GB2018072A publication Critical patent/GB2018072A/en
Application granted granted Critical
Publication of GB2018072B publication Critical patent/GB2018072B/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/13—Modifications for switching at zero crossing
    • H03K17/136—Modifications for switching at zero crossing in thyristor switches

Landscapes

  • Electronic Switches (AREA)

Abstract

A resistor (R3) and an integrating circuit (R4, C2) are connected to the output of a full wave rectifier (D1 to D4). A light emitting diode (D6) is coupled between resistor (R3) and the capacitor (C2) of the integrating circuit. The light emitting diode is optically coupled to a light sensor (Q1) coupled into a triac control circuit. The time constant of the integrating circuit is chosen such that the still rising capacitor potential exceeds the falling potential across the resistor (R3) just before the zero crossing point of input line voltage to the rectifier. Both diodes D5, D6 then conduct to operate the triac as the input voltage approaches zero, operation just after zero-crossing being impossible with the correct time constant. The circuit is used for firing a triac in a lamp supply circuit and ensures that the initial lamp brightness and average current are low. <IMAGE>
GB7907466A 1979-03-02 1979-03-02 Control circuit Expired GB2018072B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7907466A GB2018072B (en) 1979-03-02 1979-03-02 Control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7907466A GB2018072B (en) 1979-03-02 1979-03-02 Control circuit

Publications (2)

Publication Number Publication Date
GB2018072A true GB2018072A (en) 1979-10-10
GB2018072B GB2018072B (en) 1982-06-23

Family

ID=10503572

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7907466A Expired GB2018072B (en) 1979-03-02 1979-03-02 Control circuit

Country Status (1)

Country Link
GB (1) GB2018072B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2200006A (en) * 1986-12-19 1988-07-20 Lytemode Limited Phase-controlled thyristor circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2200006A (en) * 1986-12-19 1988-07-20 Lytemode Limited Phase-controlled thyristor circuit

Also Published As

Publication number Publication date
GB2018072B (en) 1982-06-23

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee