EP0358149A2 - Circuit de commande d'une charge - Google Patents

Circuit de commande d'une charge Download PDF

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Publication number
EP0358149A2
EP0358149A2 EP89116296A EP89116296A EP0358149A2 EP 0358149 A2 EP0358149 A2 EP 0358149A2 EP 89116296 A EP89116296 A EP 89116296A EP 89116296 A EP89116296 A EP 89116296A EP 0358149 A2 EP0358149 A2 EP 0358149A2
Authority
EP
European Patent Office
Prior art keywords
contacts
auxiliary
pairs
main
auxiliary contact
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.)
Withdrawn
Application number
EP89116296A
Other languages
German (de)
English (en)
Other versions
EP0358149A3 (fr
Inventor
Yoshikazu Higuchi
Hiromichi Igarashi
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
Publication of EP0358149A2 publication Critical patent/EP0358149A2/fr
Publication of EP0358149A3 publication Critical patent/EP0358149A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H01H47/002—Monitoring or fail-safe circuits
    • H01H47/004—Monitoring or fail-safe circuits using plural redundant serial connected relay operated contacts in controlled circuit
    • H01H47/005—Safety control circuits therefor, e.g. chain of relays mutually monitoring each other

Definitions

  • This invention relates to load drive circuits, and particularly to one in which when the contacts of at least the main circuit through which electric power is supplied to a load are not opened due to some situa­tions, the power is once stopped from being supplied to the load, and then the supply of power is prevented from being resumed.
  • the contacts When a large current is flowed through the contacts to a load, the contacts may be fused to stick and not be operated.
  • the conventional load drive circuit capable of preventing the contacts from being fused to stick and thus to misoperate is a circuit comprising a relay having make-before-brake contacts which mechanically operate in such a manner as shown in Fig. 1.
  • a D C power supply 1 for a D C motor a speed control circuit 2, the D C motor 3, a load 4, relays R1, R2, contacts R1a1, R1a2, R1b to be opened and closed by the relay R1, and contacts R2a1, R2a2, R2b to be opened and closed by the relay R2.
  • a power supply 5 for driving these relays and a starting switch S.
  • the broken lines indicate that these contacts are mechanically interlocked.
  • the relays R1, R2 are energized by the power supply through the contacts R1b, R2b to operate the contacts R1a1, R1a2, R1b, R2a1, R2a2, R2b. As a result, the contacts R1a2, R2a2 are closed to allow the D C motor 3 to be driven.
  • Fig. 2 shows the diagram of opera­tion of the conventional load drive circuit of Fig. 1.
  • the circled letter indicates the corresponding relay and the noncircled letter the corresponding contacts.
  • the make operation of relays and contacts is represented by ⁇ , and the brake operation thereof by -.
  • ⁇ the make operation of relays and contacts
  • - the brake operation thereof
  • the contacts R1a1 and R2a1 must be closed before the contacts R1b and R2b are opened. To make this timing, these contacts must be constructed to be special contacts such as make-­before-brake contacts.
  • Fig. 3 shows one embodiment of this invention.
  • the D C power supply 1 for D C motor the speed control circuit 2, the D C motor 3, the load 4, the first relay R1, the second relay R2, main relays R3, R4, main contacts R3a, R4a operated by the main relays R3, R4, first auxiliary contacts R3b, R4b mechanically interlocked with the main contacts R3a, R4a, second auxiliary contacts R2a2, R2a3 to be operated by the second relay R2, third contact R2b mechanically interlocked with the second auxiliary contacts R2a2, R2a3, fourth auxiliary contact R1a2 to be operated by the first relay R1, fifth auxiliary contact R1b interlocked with the fourth auxiliary contact R1a2, and self-holding contacts R1a1, R2a1 to be operated by the first relay R1 and the second relay R2 and mechanically interlocked with the fifth auxiliary contact R1b and the third auxiliary contact R2b, respec­tively.
  • the power supply 1 for D C motor the speed control circuit 2
  • the first relay R1 is energized through the first auxiliary contacts R3b, 54b and the third auxiliary contact R2b, and then the second relay R2 is energized through the closed fourth auxiliary contact R1a2.
  • the main relay R3 is operated through the closed second auxiliary contact R2a2. Since the first auxiliary contact R3b is opened by the main relay R3, the first relay R1 is in the nonenergized condition. Thus, since the fifth auxiliary contact R1b is closed, the main relay R4 is energized.
  • FIG. 4 shows a diagram useful for explaining the operation of a load drive circuit of this invention of Fig. 3.
  • the circled characters represent the corresponding relays and the noncircled characters the corresponding contacts.
  • the make operation of the relay and contacts is represented by mark ⁇ , and the brake operation thereof by mark -.

Landscapes

  • Keying Circuit Devices (AREA)
  • Protection Of Static Devices (AREA)
  • Control Of Electric Motors In General (AREA)
  • Direct Current Feeding And Distribution (AREA)
  • Safety Devices In Control Systems (AREA)
EP19890116296 1988-09-05 1989-09-04 Circuit de commande d'une charge Withdrawn EP0358149A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP220355/88 1988-09-05
JP63220355A JPH0270287A (ja) 1988-09-05 1988-09-05 負荷駆動回路

Publications (2)

Publication Number Publication Date
EP0358149A2 true EP0358149A2 (fr) 1990-03-14
EP0358149A3 EP0358149A3 (fr) 1991-09-11

Family

ID=16749839

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890116296 Withdrawn EP0358149A3 (fr) 1988-09-05 1989-09-04 Circuit de commande d'une charge

Country Status (2)

Country Link
EP (1) EP0358149A3 (fr)
JP (1) JPH0270287A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0498500A1 (fr) * 1991-02-08 1992-08-12 Koninklijke Philips Electronics N.V. Appareil muni d'au moins un moteur électrique et d'un circuit pour la commande du moteur électrique
EP1099519A2 (fr) * 1997-02-07 2001-05-16 Matsushita Electric Industrial Co., Ltd. Dispositif de sécurité pour un robot comprenant un circuit d'arrêt d'urgence
CN116317660A (zh) * 2023-03-28 2023-06-23 苏州腾圣技术有限公司 一种可控逆变器电路

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2449725A1 (de) * 1974-10-19 1976-04-22 Tesch Kg E Pressensicherheitsrelais
EP0007420A1 (fr) * 1978-07-14 1980-02-06 Erwin Sick GmbH Optik-Elektronik Circuit de sécurité pour une machine dangereuse protégée par rayons lumineux
DE3619723A1 (de) * 1986-06-12 1987-12-17 Kloeckner Moeller Elektrizit Kontaktbehaftete zusatzsteuerung fuer sicherheitsstromkreise

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2449725A1 (de) * 1974-10-19 1976-04-22 Tesch Kg E Pressensicherheitsrelais
EP0007420A1 (fr) * 1978-07-14 1980-02-06 Erwin Sick GmbH Optik-Elektronik Circuit de sécurité pour une machine dangereuse protégée par rayons lumineux
DE3619723A1 (de) * 1986-06-12 1987-12-17 Kloeckner Moeller Elektrizit Kontaktbehaftete zusatzsteuerung fuer sicherheitsstromkreise

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0498500A1 (fr) * 1991-02-08 1992-08-12 Koninklijke Philips Electronics N.V. Appareil muni d'au moins un moteur électrique et d'un circuit pour la commande du moteur électrique
EP1099519A2 (fr) * 1997-02-07 2001-05-16 Matsushita Electric Industrial Co., Ltd. Dispositif de sécurité pour un robot comprenant un circuit d'arrêt d'urgence
EP1099519A3 (fr) * 1997-02-07 2010-06-02 Panasonic Corporation Dispositif de sécurité pour un robot comprenant un circuit d'arrêt d'urgence
CN116317660A (zh) * 2023-03-28 2023-06-23 苏州腾圣技术有限公司 一种可控逆变器电路
CN116317660B (zh) * 2023-03-28 2023-10-20 苏州腾圣技术有限公司 一种可控逆变器电路

Also Published As

Publication number Publication date
JPH0270287A (ja) 1990-03-09
EP0358149A3 (fr) 1991-09-11

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