GB1536405A - Ac supply control systems - Google Patents

Ac supply control systems

Info

Publication number
GB1536405A
GB1536405A GB5185475A GB5185475A GB1536405A GB 1536405 A GB1536405 A GB 1536405A GB 5185475 A GB5185475 A GB 5185475A GB 5185475 A GB5185475 A GB 5185475A GB 1536405 A GB1536405 A GB 1536405A
Authority
GB
United Kingdom
Prior art keywords
transistor
touch
load
conductive
triac
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
GB5185475A
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.)
Texas Instruments Ltd
Original Assignee
Texas Instruments 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 Texas Instruments Ltd filed Critical Texas Instruments Ltd
Priority to GB5185475A priority Critical patent/GB1536405A/en
Publication of GB1536405A publication Critical patent/GB1536405A/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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/96—Touch switches
    • H03K17/962—Capacitive touch switches

Abstract

1536405 Touch responsive switching systems TEXAS INSTRUMENTS Ltd 18 Dec 1975 51854/75 Heading G1N [Also in Division H2] A switching system for controlling the current flowing in a load 1 from an A.C. source comprises a gated semi-conductor switch e.g. a triac 4 connected in series with the load, gating signals for the triac being developed by a control circuit which includes a plurality of touch plates 33. Pulses are developed in a transformer 10 whenever the A.C. source voltage passes through zero such pulses being transmitted to a further transformer 9 to gate the triac 4 whenever a transistor 22 is conductive. Assuming the transistor 22 to be non-conductive and a transistor 27 in a bi-stable flip-flop conductive the load 1 will be de-energized. A touch on one of the plates 33 will cause a field effect transistor 28 is momentarily switched off thus causing a transistor 29 to be switched on whereby a negative going pulse to be generated which is applied to the flip-flop causing it to change state. Transistor 27 thus becomes non-conductive, transistor 22 becomes conductive to gate the triac 4 and the load is energized. A further touch on one of the plates 33 acts in a similar manner to again change the state of the flip-flop so de-energizing the load. Leakage injection for the touch plates 33 is provided by way of a resistor 21 which is made adjustable to suit the length of the inter-connecting leads for the touch plate system.
GB5185475A 1975-12-18 1975-12-18 Ac supply control systems Expired GB1536405A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB5185475A GB1536405A (en) 1975-12-18 1975-12-18 Ac supply control systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5185475A GB1536405A (en) 1975-12-18 1975-12-18 Ac supply control systems

Publications (1)

Publication Number Publication Date
GB1536405A true GB1536405A (en) 1978-12-20

Family

ID=10461648

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5185475A Expired GB1536405A (en) 1975-12-18 1975-12-18 Ac supply control systems

Country Status (1)

Country Link
GB (1) GB1536405A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103138729A (en) * 2013-01-25 2013-06-05 温州大学 No-voltage-type electronic touch switch

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103138729A (en) * 2013-01-25 2013-06-05 温州大学 No-voltage-type electronic touch switch
CN103138729B (en) * 2013-01-25 2015-08-12 温州大学 No-voltage-type electronic touch switch

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Legal Events

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