GB2018072A - Control circuit - Google Patents
Control circuitInfo
- 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
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>
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2200006A (en) * | 1986-12-19 | 1988-07-20 | Lytemode Limited | Phase-controlled thyristor circuit |
-
1979
- 1979-03-02 GB GB7907466A patent/GB2018072B/en not_active Expired
Cited By (1)
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 |