JPS572124A - Alternating current switching circuit - Google Patents

Alternating current switching circuit

Info

Publication number
JPS572124A
JPS572124A JP7416480A JP7416480A JPS572124A JP S572124 A JPS572124 A JP S572124A JP 7416480 A JP7416480 A JP 7416480A JP 7416480 A JP7416480 A JP 7416480A JP S572124 A JPS572124 A JP S572124A
Authority
JP
Japan
Prior art keywords
turned
output
zero
cross point
circuit
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.)
Pending
Application number
JP7416480A
Other languages
Japanese (ja)
Inventor
Hiroshi Matsushita
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP7416480A priority Critical patent/JPS572124A/en
Priority to US06/267,931 priority patent/US4370564A/en
Priority to DE3122280A priority patent/DE3122280C2/en
Publication of JPS572124A publication Critical patent/JPS572124A/en
Pending 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

Abstract

PURPOSE:To obtain a normal function of a transformer with no saturation of an iron core, by turning on and off a TRIAC based on an on-off command and simultaneously with the output of a circuit that detects an AC zero-cross point. CONSTITUTION:When a command signal C supplied to the D terminal of an FF14 is changed from on to off, the Q output of the FF14 changes from H to L level. As a result, a transistor TR15 is turned off to eliminate the output (e) of a gate circuit 19. Thus a TRIAC6 is turned off at the zero-cross point where the AC (a) shifts to an adverse phase from a forward phase. When a command signal (c) is turned on again by a request of the secondary side load, the Q output of FF14 is turned to H level synchronously with the rise of a pulse (b). Accordingly, the TR15 is turned on again, and the TRIAC6 is turned off at the zero-cross point where the forward phase shifts to the adverse phase by the output (e) of the circuit 19 and like the off mode. Thus the residual magnetic field stored in the off-state is negative by the current which flows in the on-state. As a result, the iron core is never saturated.
JP7416480A 1980-06-04 1980-06-04 Alternating current switching circuit Pending JPS572124A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP7416480A JPS572124A (en) 1980-06-04 1980-06-04 Alternating current switching circuit
US06/267,931 US4370564A (en) 1980-06-04 1981-05-28 AC Switching device
DE3122280A DE3122280C2 (en) 1980-06-04 1981-06-04 AC switching device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7416480A JPS572124A (en) 1980-06-04 1980-06-04 Alternating current switching circuit

Publications (1)

Publication Number Publication Date
JPS572124A true JPS572124A (en) 1982-01-07

Family

ID=13539234

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7416480A Pending JPS572124A (en) 1980-06-04 1980-06-04 Alternating current switching circuit

Country Status (1)

Country Link
JP (1) JPS572124A (en)

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