JPS5478071A - Relay control circuit - Google Patents

Relay control circuit

Info

Publication number
JPS5478071A
JPS5478071A JP14497677A JP14497677A JPS5478071A JP S5478071 A JPS5478071 A JP S5478071A JP 14497677 A JP14497677 A JP 14497677A JP 14497677 A JP14497677 A JP 14497677A JP S5478071 A JPS5478071 A JP S5478071A
Authority
JP
Japan
Prior art keywords
voltage
power source
oscillator
relay
comparator
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
JP14497677A
Other languages
Japanese (ja)
Other versions
JPS556973B2 (en
Inventor
Katsuhiko Yabe
Kenichi Iizuka
Yasunori Tominaga
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
Priority to JP14497677A priority Critical patent/JPS5478071A/en
Publication of JPS5478071A publication Critical patent/JPS5478071A/en
Publication of JPS556973B2 publication Critical patent/JPS556973B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Relay Circuits (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

PURPOSE: To prevent contact deterioration and welding of a relay by providing an oscillator, which is not synchronized with the frequency of a power source, and superposing the output voltage of the oscillator onto the reference voltage or the detected signal voltage and distributing the timing of relay turning-on and off uniformly in respect to the power source phase.
CONSTITUTION: A control circut is constituted by comparator 21, oscillator 24 which oscillates on a frequency lower than the power source frequency, voltage adjustment part 25 which superposes the pulse voltage having a peak over twice of the peak value of the induced hum voltage onto the reference voltage or the detected signal voltage, etc. Next, the output of comparator 21 is applied to relay 26 consisting of contact 27, AC power source 28, load 29, etc. By this constitution, when the difference between reference voltage 35 and detected signal voltage 36 is smaller, comparator 21 is turned on and off by pulses from oscillator 24 which is oscillated by induced hum 33. That is, this turning-on and off timing is independent of the power source phase, and contact transfer is prevented from being generated due to power source hum induction.
COPYRIGHT: (C)1979,JPO&Japio
JP14497677A 1977-12-05 1977-12-05 Relay control circuit Granted JPS5478071A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14497677A JPS5478071A (en) 1977-12-05 1977-12-05 Relay control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14497677A JPS5478071A (en) 1977-12-05 1977-12-05 Relay control circuit

Publications (2)

Publication Number Publication Date
JPS5478071A true JPS5478071A (en) 1979-06-21
JPS556973B2 JPS556973B2 (en) 1980-02-21

Family

ID=15374569

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14497677A Granted JPS5478071A (en) 1977-12-05 1977-12-05 Relay control circuit

Country Status (1)

Country Link
JP (1) JPS5478071A (en)

Also Published As

Publication number Publication date
JPS556973B2 (en) 1980-02-21

Similar Documents

Publication Publication Date Title
TW349286B (en) DC-DC converter
JPS5457829A (en) Processing circuit for color video signal
ES8405192A1 (en) Proximity switch circuit.
CA2046851A1 (en) Apparatus and method of induction-hardening machine components with precise power output control
JPS5481529A (en) Ignition and flame detector
FR2441947A1 (en) Polyphase mains-operated converter compensating for frequency changes - has sawtooth generators with integrators charged to same amplitude (NL 20.5.80)
EP0287676A4 (en) Rf power source apparatus.
IT1042570B (en) Pulse generator for television receiver deflector - has phase and level comparators with signal prevention devices
JPS538847A (en) High frequency heater
JPS5797710A (en) Power amplifying device
FR2444970A1 (en) Thyristor operating in switching control mode - uses constant frequency oscillator to set pulse cycle time
FR2394927A1 (en) Successive electrical current pulse programmable sequencer - has inhibition circuit made up of programmable divider fed by frequency divider and zero reset by second divider
JPS54152139A (en) Multi-voltage power source
JPS53110134A (en) Flicker control device for arc furnace
FR2428938A1 (en) Trigger pulse generator for polyphase rectifier circuits - maintains firing angles by oscillator controlled binary logic (OE 15.10.79)
JPS5395231A (en) Frequency converter
JPS52111622A (en) Semiconductor control apparatus
JPS532741A (en) Inductive heating unit
JPS558672A (en) Power source unit of video apparatus
JPS55101009A (en) Displacement position detector
JPS5426653A (en) Phase synchronism circuit
JPS5337934A (en) High-frequency heater
JPS57155631A (en) Multioutput sequence circuit of switching regulator
JPS5566844A (en) Electron beam generating apparatus
JPS5467661A (en) Switching regulator controller