Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
  • H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
  • H01H9/56—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere for ensuring operation of the switch at a predetermined point in the AC cycle
  • H01H9/563—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere for ensuring operation of the switch at a predetermined point in the AC cycle for multipolar switches, e.g. different timing for different phases, selecting phase with first zero-crossing

Definitions

• the invention relates to a method for electronic drive control according to the preamble of claim 1.
• An electronic drive control for a magnetic drive is known from EP 0 789 378 A1.
• control voltage of a contactor is derived from one of the three phases, it can lead to synchronization effects between the closing or opening angle of the main contacts in the load circuit and the AC control voltage.
• the object of the invention is to provide a method according to the preamble of claim 1, in which the life of a contactor is increased.
• the invention prevents uneven erosion of the switching contacts and thus increases the contactor's service life.
• Fig. 4 is a first flow chart
• 5 shows a further flow chart. 1 shows a time diagram in which the rectified supply voltage is shown in a lower curve, the supply voltage being an AC voltage.
• the voltage of the electronics After switching on the supply voltage at time t 0 , which is in the zero voltage crossing, the voltage of the electronics only builds up after 3 to 5 ms. After this voltage build-up, a reset signal for a microcontroller is issued. The program is started. After this point in time t, the state in which the contactor is operated is recognized. It is checked what type of control it is. The determination relates to conventional operation, PLC operation or low-power operation. This detection of the input takes about 5 ms, the end of the detection being identified by t 2 . If a level is present, then conventional operation is recognized.
• Period of the control voltage is.
• the supply voltage is measured only after this delay time, the point in time being identified by t 3 , the supply voltage being both a
• Supply voltage is (AC or DC). At the same time, the level of the applied voltage is determined.
• Delay time t x at any point on the sine curve Supply voltage can be.
• the time of the tightening process varies depending on the type of protection.
• the tightening takes place after 50 to 100 ms.
• the switching point t 5 of the contacts is also randomly distributed for the other phases, which causes the switching contacts to be evenly stressed.
• the dashed lines show different switch-on points, different ones
• Microcontroller must first be set up, the reset signal is almost independent of the switch-on time always on the same point on the curve, so that the switch-on times are practically synchronized to the same reset time.
• control voltage e.g. switched on at zero voltage
• the supply voltage for the electronics does not build up immediately.
• the method explained avoids undesirable synchronization effects between the closing angle or opening angle of the main contacts in the load circuit.
• a random generator is required to implement a timer with a variable, randomly set time.
• the value supplied by the random number generator is then processed in such a way that the subsequent processing of the value results in a time from zero to a maximum of half the period of the control voltage.
• FIG. 3 shows a schematic diagram. In the first possibility, a value is read out in a RAM memory location in the microcontroller, the content of this cell being undefined after the voltage has been switched on.
• FIG. 4 shows the associated flowchart for implementation with a RAM.
• a value is obtained from a memory cell 1 of an EEPROM, which is manipulated accordingly.
• the old value is used to determine the new value.
• the old value is then replaced by the new value in
• the manipulated value is then written into register 2.
• the timer is then started. When the timer reaches zero, an arises
• Timer underflow which is passed on to the CPU, and the program continues.
• This additional time loop means that the closing and opening angles of the main contacts are not synchronized with the control voltage.

Landscapes

• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Relay Circuits (AREA)
• Control Of Electrical Variables (AREA)
• Control Of Eletrric Generators (AREA)
• Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
• Valve Device For Special Equipments (AREA)
• Control Of Motors That Do Not Use Commutators (AREA)
• Keying Circuit Devices (AREA)
• Control Of Electric Motors In General (AREA)
• Electronic Switches (AREA)

Priority Applications (6)

Applications Claiming Priority (2)

Publications (1)

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ID=7916099

Family Applications (1)

Country Status (8)

Families Citing this family (4)

Citations (3)

Family Cites Families (6)

• 1999
  • 1999-07-26 DE DE19935044A patent/DE19935044A1/de not_active Withdrawn
• 2000
  • 2000-07-15 WO PCT/EP2000/006774 patent/WO2001008181A1/de not_active Ceased
  • 2000-07-15 EP EP00951390A patent/EP1198808B1/de not_active Expired - Lifetime
  • 2000-07-15 ES ES00951390T patent/ES2208389T3/es not_active Expired - Lifetime
  • 2000-07-15 AU AU64347/00A patent/AU6434700A/en not_active Abandoned
  • 2000-07-15 DE DE50003920T patent/DE50003920D1/de not_active Expired - Lifetime
  • 2000-07-15 AT AT00951390T patent/ATE251332T1/de active
  • 2000-07-15 JP JP2001512602A patent/JP2003505840A/ja active Pending
  • 2000-07-15 US US10/048,047 patent/US6671157B1/en not_active Expired - Lifetime

Patent Citations (3)

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