EP3920202A1 - Agencement de commutation et procédé de détermination du moment de commutation exact d'un relais électromécanique - Google Patents

Agencement de commutation et procédé de détermination du moment de commutation exact d'un relais électromécanique Download PDF

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Publication number
EP3920202A1
EP3920202A1 EP20177866.9A EP20177866A EP3920202A1 EP 3920202 A1 EP3920202 A1 EP 3920202A1 EP 20177866 A EP20177866 A EP 20177866A EP 3920202 A1 EP3920202 A1 EP 3920202A1
Authority
EP
European Patent Office
Prior art keywords
switching
relay
time
control device
current
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
EP20177866.9A
Other languages
German (de)
English (en)
Inventor
Artur Bowenk
Moritz Briem
Torben Klein
Henrik MARKS
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.)
Ise Individuelle Software und Elektronik GmbH
Original Assignee
Ise Individuelle Software und Elektronik GmbH
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 Ise Individuelle Software und Elektronik GmbH filed Critical Ise Individuelle Software und Elektronik GmbH
Priority to EP20177866.9A priority Critical patent/EP3920202A1/fr
Publication of EP3920202A1 publication Critical patent/EP3920202A1/fr
Pending legal-status Critical Current

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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
    • 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
    • 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
    • H01H47/22—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil

Definitions

  • the present invention relates to a switching arrangement for determining the exact switching time of an electromechanical relay which has a relay coil and a relay switch, a socket with such a switching arrangement and a method for determining the same.
  • An electromechanical relay is an electromagnetically operated, remotely operated switch operated by an electric current, with two or more switching positions, which is activated via a control circuit and can switch one or more additional circuits.
  • Electromechanical relays are known in a large number of different designs. In many of these designs, electromechanical relays have a relay coil and a relay switch. When a current is applied to the relay coil, it creates a magnetic flux. The relay switch is movably arranged in the relay and is moved by the magnetic flux in such a way that a switching process is triggered, i.e. electrical contacts are opened or closed.
  • the activation time at which a switching signal for activating the relay coil is sent and the switching time at which the switching process of the electrical contacts is ended do not coincide.
  • the switching duration i.e. the time difference between the activation time and the switching time, is influenced, among other things, by the design, the relay temperature and the aging process. Furthermore, manufacturing tolerances can cause different switching times between relays of the same construction.
  • electromechanical relays have been superseded by electronic switches that use transistors. Electronic switches are typically smaller and have shorter switching times than relays. However, some applications still require the use of electromechanical relays and do not allow the use of electronic switches for various reasons. In other applications, the use of electronic switches based on transistors is associated with disadvantages. Advantages of electromechanical relays are, for example, a high insulation resistance and a high reverse voltage due to galvanic isolation.
  • Electromechanical relays also have a high switch-on power and a high overload capacity. Furthermore, the switching status of electromechanical relays can be seen with the naked eye.
  • One possibility of precisely determining the switching time of the electromechanical relay is based on determining the switching duration of the electromechanical relay and bringing the triggering time forward by the specific switching duration. Since some of the factors that have an influence on the switching duration of the relay are subject to fluctuations over time, it is not sufficient, for example, to determine the switching duration of the electromechanical relay once and to advance the activation time of each switching process by this once-determined value. Changes in the switching duration over time were not taken into account here, so that the possible uses of such a procedure remained limited.
  • the switching duration is known from each switching point in time of the electromechanical relay, then, in addition to increasing the service life of the electromechanical relay, malfunctioning of the electromechanical relay can be detected, for example "sticking" (not opening) or delayed opening of the relay switch. "Sticking” can be caused, for example, by a voltage flashover when the relay switch is opened, which welds the contacts to one another. But external influences such as adhesive substances can also cause the relay switch to "stick".
  • the present invention is therefore based on the object of precisely determining the switching time of an electromechanical relay.
  • the present invention is therefore also based on the object of reliably detecting a malfunction of an electromechanical relay.
  • a switching arrangement comprising: an electromechanical relay which has a relay coil and a relay switch; a switching device; a voltage source connected to the relay coil, which is set up to control the relay coil by means of the switching device and a voltage provided by the voltage source; a detection device connected to the relay coil, which detection device is configured to detect an electrical signal profile applied to the electromechanical relay; a control device connected to the detection device and the switching device, which control device is set up to send a switching signal for controlling the relay coil to the switching device at an activation time and to receive and store the electrical signal profile detected by the detection device; wherein the control device is further set up to use a received and / or a stored electrical signal curve to determine a switching point in time at which the relay switch is switched.
  • a relay coil is understood to be a component that is suitable for generating or detecting a magnetic field.
  • the relay coil can have a winding of a current conductor made of wire, enamelled copper wire, silver-plated copper wire and / or high-frequency stranded wire.
  • the winding can be wound on a bobbin, for example.
  • the coil body can in particular comprise a soft magnetic material.
  • the electrical signal curve applied to the electromechanical relay can be, for example, a curve of an electrical current flowing through the electromechanical relay, the curve of an electrical voltage applied to the electromechanical relay, or the curve of another electrical variable connected to the electromechanical relay.
  • a method for determining a switching time of an electromechanical relay which is connected to a voltage source and a switching device, has a relay coil and a relay switch and is connected to a detection device, comprising the steps of: providing a voltage supply; Sending a switching signal to control the relay coil to the switching device at a control time; Detecting a signal curve applied to the electromechanical relay by means of the detection device; Receiving the electrical signal waveform at a control device; Storing the electrical waveform; Determining a switching time at which the relay switch is switched by using a received and / or a stored electrical signal curve.
  • the electrical signal curve applied to the electromechanical relay is a current curve flowing through the electromechanical relay;
  • the current profile flowing through the electromechanical relay is a current profile flowing through the relay coil; and
  • the control device is further set up to determine the switching time from a local extreme of the received and / or stored current profile.
  • control device in the switching arrangement according to claim 1, is also set up to store the control time associated with the received and / or stored electrical signal curve and a new control time from a difference between the stored control time and to determine a corresponding determined switching time.
  • the relay switch comprises a changeover switch with one or more changeover contacts;
  • the signal profile applied to the electromechanical relay is a voltage profile applied to one of the one or more changeover contacts; and the control device is set up to determine the switching point in time as a level change in the received or stored voltage profile.
  • the level change of the received or stored voltage curve can be, for example, a digital level change.
  • the switching arrangement advantageously further comprises an alternating current circuit which has an alternating voltage source and a load, the relay switch being set up to switch the alternating current circuit.
  • the control device is also expediently set up to determine a voltage profile and / or a current profile of the AC circuit and to determine the switching time of the electromechanical relay as a function of the trigger time and the voltage profile and / or the current profile of the AC circuit.
  • control device is set up to determine at least one zero crossing of the voltage profile and / or the current profile of the AC circuit; and to set the control time to a value by which the switching time of the electromechanical relay coincides with a zero crossing of the voltage profile and / or the current profile.
  • control device has a microcontroller.
  • the electromechanical relay has a switching time between 1 ms and 50 ms.
  • the switching arrangement also advantageously comprises a temperature measuring device which is set up to measure a current temperature and to send it to the control device, the control device also being set up to use the measured temperature to determine a switching time at which the relay switch is switched .
  • control device has a lookup table with correction values over time, and the control device is also set up to to use the lookup table to determine a switching point in time at which the relay switch is switched.
  • the invention further provides a socket outlet comprising a switching arrangement according to one of Claims 1 to 11.
  • the method can provide that the electrical signal profile applied to the electromechanical relay is a current profile flowing through the relay coil; wherein the method further comprises the step of: determining a local extreme of the received and / or the stored current profile.
  • the method further comprises the steps of: storing the actuation time associated with the received and / or stored electrical signal profile; and determining a new activation time from a difference between the stored activation time and a corresponding determined switching time.
  • the relay switch comprises a changeover switch with one or more changeover contacts; and the electrical signal profile applied to the electromechanical relay is a voltage profile applied to one of the one or more changeover contacts; and the method further comprises the step of: determining the switching time as a level change of the received or stored voltage profile by means of the control device.
  • the switching device advantageously further comprises an alternating current circuit which has an alternating voltage source and a load; the method further comprising the step of: switching the AC circuit with the relay switch.
  • the method further comprises the steps of: determining a voltage profile of the AC circuit; and determining the switching instant of the electromechanical relay as a function of the actuation instant and the voltage profile of the alternating current circuit.
  • the method advantageously further comprises the steps of: determining at least one zero crossing of the voltage profile and / or the current profile of the AC circuit; and setting the trigger time to a value by which the switching time of the electromechanical relay coincides with a zero crossing of the voltage profile and / or the current profile of the AC circuit.
  • the method advantageously provides for the electromechanical relay to have a switching time between 1 ms and 50 ms.
  • the method further comprises the steps of: measuring a current temperature by means of a temperature measuring device; Sending the measured current temperature to the control device; and determining a switching point in time by means of the measured current temperature.
  • the method can further include the step of using a lookup table to determine a switching point in time at which the relay switch is switched.
  • the invention is based on the surprising finding that a simple measurement of an electrical signal flowing through an electromechanical relay enables the exact switching time of the electromechanical relay to be determined, an alternating voltage or an alternating current to be de-energized, the service life of the electromechanical relay to be increased and to detect a malfunction of the electromechanical relay at an early stage.
  • FIG. 1 shows a circuit diagram of a circuit arrangement 10 according to a particular embodiment of the invention.
  • the switching arrangement has an electromechanical relay 12.
  • the electromechanical relay 12 has a relay coil 14 and a relay switch 16.
  • the relay coil 14 is connected to a voltage source 20 via a switching device 18 connected.
  • the switching device 18 can be switched into an open and a closed state. When the switching device 18 is closed, the relay coil 14 is supplied with current via the voltage source 20. When the switching device 18 is open, the power supply to the relay coil 14 is interrupted.
  • the relay coil 14 is also connected to a detection device 22 which is set up to detect an electrical signal profile flowing at the electromechanical relay.
  • the acquisition device 22 can comprise, for example, a digital acquisition device and / or an analog acquisition device.
  • a control device 24 is connected to the detection device 22 and the switching device 18 for signaling and / or control purposes.
  • the detection device 22 can be designed, for example, as a current detection device or a voltage detection device which is set up to detect a current applied to the electromechanical relay or a voltage applied to the electromechanical relay 12.
  • the detection device 22 is designed as a current detection device which is set up to detect a coil current flowing through the relay coil 14 in order to determine the current profile.
  • the control device 24 can for example have a microcontroller, which can in particular have work and program memories, LCD controllers and / or interfaces, for example USB interfaces, serial or Ethernet interfaces. Furthermore, it can also be provided that the control device 24 is a microcontroller.
  • the control device 24 is set up to send a switching signal for controlling the relay coil 14 to the switching device 18 at an activation time.
  • the switching device 18 can be opened and / or closed by the switching signal.
  • the control device 24 is set up to receive and store the current profile detected by the detection device 22. Furthermore, the control device 24 is set up to use a received and / or a stored coil current curve to determine a switching point in time at which the relay switch 16 is switched. To this end, the control device 24 can determine a local extreme of the coil current curve. Optionally, the control device 24 can be set up to approximate the received and / or stored coil current profile, for example by means of a polynomial. The time at which the Current curve reaches a local extreme, that is to say a local minimum or a local maximum, corresponds to the switching time. A switching time determined in this way, depending on the type of electromechanical relay, can be more precise by a factor of 100 to 1000 or more than if the triggering time is equated with the switching time.
  • the control device 24 can also be set up to determine a switching duration of the electromechanical relay 12 from the difference between the activation time and the determined switching time.
  • a planned switching time can be precisely determined by subtracting the determined switching duration of the electromechanical relay 12 from the planned switching time. If a new activation time is set at a time determined by the difference between the planned switching time and the switching duration of the electromechanical relay 12, the switching time will also take place at the planned switching time.
  • the switching arrangement 10 also has an alternating current circuit 26.
  • the AC circuit 26 has an AC voltage source 28 and a load 30.
  • the relay switch 16 is set up to switch the alternating current circuit 26.
  • control device 24 is also set up to determine the voltage profile of the alternating current circuit 26.
  • the voltage profile of the alternating current circuit 26 can be determined, for example, via a voltage measuring device (not shown here) connected to the alternating current circuit 26.
  • the control device 24 can be set up to determine the switching time of the electromechanical relay 12 as a function of the activation time and the voltage profile of the alternating current circuit 26.
  • control device 24 can be set up to determine the current profile of the alternating current circuit 26.
  • the course of the current can be determined, for example, via a current measuring device connected to the alternating current circuit 26 (also not shown here).
  • the control device 24 can be set up to determine the switching time of the electromechanical Relay 12 to be determined as a function of the control time and the current curve of the alternating current circuit 26.
  • the trigger time can be set so that the electromechanical relay 12 is switched at a precise point in time, for example at the zero crossing of the AC voltage applied to the AC circuit 26 and / or at the zero crossing of the AC current applied to the AC circuit 26 will.
  • the control device 24 can be set up to determine at least one zero crossing of the voltage curve and / or the current curve of the alternating current circuit 26 and to set the trigger time to a value by which the switching time of the electromechanical relay 12 with a zero crossing of the voltage curve and / or the current curve of the AC circuit 26 collapses.
  • the voltage curve and / or the current curve can be determined by an explicit measurement of the current curve and / or the voltage curve of the AC circuit 26, or by a dedicated chip (not shown) that generates an interrupt signal at the zero crossing of the voltage curve and / or the current curve of the AC circuit 26 sends to the control device.
  • the activation time results from the difference between the planned switching time and the switching duration.
  • the control device 24 can also be set up to determine the frequency of the alternating voltage or alternating current of the alternating current circuit 26.
  • the frequency of the alternating voltage or alternating current of the alternating current circuit 26 can also be stored separately therefrom in the control device 24.
  • the switching arrangement 10 can furthermore have a temperature measuring device (not shown here) which is set up to measure a current temperature of a part of the switching arrangement and / or of the electromechanical relay 12.
  • the switching duration of the electromechanical relay 12 can be determined by means of the temperature measuring device as a function of the measured temperature.
  • the temperature dependency of the switching duration can also be stored by the control device 24.
  • the temperature dependency of the switching duration can be stored, for example, in the form of a lookup table. If an exact switching time is now to be determined, the control device 24 first determines the current temperature and then selects the one associated with the current temperature Switching duration from the lookup table.
  • the exact trigger time is determined from the planned exact switching time and by means of the switching duration associated with the measured temperature. In this way, temperature-dependent fluctuations in the switching duration of the electromechanical relay 12 can be compensated for.
  • the accuracy of the determination of the switching time is further increased relative to the temperature-independent method.
  • FIG. 13 shows an exemplary illustration of the on the detection device 22 of the switching arrangement according to FIG Figure 1 measured current over the period of a switching process in which the relay switch 16 is closed.
  • the current curve is that of an electromechanical relay 12 in which the relay switch 16 is in a normally open state, for example a reset mechanism (not shown) opens the relay switch 16 when no external force acts on the relay switch 16.
  • a return mechanism can be a spring mechanism, for example.
  • the current I flowing through the relay coil is plotted against the time t, as is determined, for example, by the detection device 22 of FIG Figure 1 switching arrangement 10 shown can be detected.
  • the relay switch 16 and the switching device 18 are open and no current flows through the relay coil 14 and the detection device 22.
  • a switching signal is sent to the switching device 18, whereby the switching device 18 is closed and the current I flowing through the relay coil 14 increases. With the current I, the strength of the magnetic field of the relay coil 14 also increases.
  • the magnetic field of the relay coil 14 has reached a field strength at which a movement of the relay switch 16 begins.
  • the relay switch 16 is completely closed.
  • the current I increases again from this point in time until a maximum current I max is reached.
  • FIG. 13 shows an exemplary illustration of the on the detection device 22 of the switching arrangement according to FIG Figure 1 measured current over the period of a switching process in which the relay switch 16 is opened.
  • the relay switch 16 of the electromechanical relay 12 is in a normally open state.
  • the electromechanical relay 12 can therefore have a reset device which opens the relay switch 16 when no external force acts on the relay switch 16.
  • a switching signal is sent to the switching device 18, as a result of which the switching device 18 is opened and the current I flowing through the relay coil 14 drops. With the current I, the strength of the magnetic field of the relay coil 14 also decreases.
  • the magnetic field of the relay coil 14 has dropped to a field strength at which, for example, a reset device triggers a movement of the relay switch 16.
  • the movement triggered, for example, by the resetting device induces a current in the relay coil 14, which can be seen as a rise in the current curve.
  • the relay switch 16 is completely open.
  • the electrical contact of the relay switch 16 is interrupted at the beginning of the movement process, not only when the movement process is completed.
  • the switching times T a and T b for closing and opening the electromechanical relay 12 are fundamentally different from one another.
  • the switching device according to the invention can take these differences into account by storing electrical signal curves and / or switching times for opening and closing the electromechanical relay 12 separately from one another and using them separately from one another to determine a switching point in time.
  • Figure 4 shows a circuit diagram of a circuit arrangement 10 according to a further particular embodiment of the invention.
  • the electromechanical relay 12 has a changeover switch 32 with a first changeover contact 38, a second changeover contact 40 and a central connection 36.
  • the changeover switch 32 connects the common center connection 36 to the first changeover contact 38 in a first position and to the second changeover contact 40 in a second position
  • Signal resistor 44 and a diode 45 establish a contact between the center connection 36 and an input 46 of the control device 24.
  • the input 46 is also connected to the supply voltage 50 of the control device 24 via a pull-up resistor 48.
  • the switching time at which the second changeover contact is switched can be detected by the control device 24 as a digital level change of the voltage present at the input 46 of the control device 24.
  • the detection device 22 can be integrated in the control device 24.
  • the detection device 22 can also be arranged separately from the control device 24.
  • the detection device 22 is also designed as a voltage detection device.
  • the reference potential of a second input 52 of the control device 24 is identical to the reference potential of an input 53 of a DC voltage supply 54, by means of which the control device 24 is supplied with current via the second input 52 . In the embodiment shown, this is ensured by a reference potential 56 shared by the control device 24 and the DC voltage supply 54.
  • the control device 24 is also connected to the DC voltage supply 54 via a supply line 58.
  • the direct voltage supply 54 converts a 230 V alternating voltage of the alternating current circuit 26 into a 3.3 V direct voltage for supplying the control device 24.
  • other voltages can also be applied to the alternating current circuit 26 and / or to the control device 24.
  • the DC voltage supply 54 has a bridge rectifier circuit 58, two resistors 59 and connected in series a polarized capacitor 61 for smoothing the rectified voltage. In alternative embodiments, however, other rectifier circuits can also be used.
  • the relay coil 14 is supplied with voltage via the voltage source 20.
  • the control device 24 is connected to the relay coil 14 via an output 60 for signaling and / or control purposes.
  • a driver stage 62 is arranged between the control device 24 and the relay coil 14.
  • the driver stage 62 has a switching device 18, which is designed as an NMOS transistor in the embodiment shown, a driver stage diode 64 and an internal driver stage resistor 66.
  • a PMOS transistor or another suitable component can also be used.
  • the driver stage 62 amplifies the signal going out at the output 60 to such an extent that the changeover switch 32 can be switched via the relay coil 14.
  • the switching time at which the control device 24 sends the switching signal for switching the changeover switch 32 is stored by the control device 24.
  • the time at which a digital level change of the voltage applied to the changeover contact 40 is detected at the input 46 is also stored by the control device 24. The difference between these two times can be stored as the switching duration of the electromechanical relay 12.
  • Figure 5 shows an exemplary representation of the at the input 46 of the control device 24 of the switching arrangement 10 according to FIG Figure 4 applied voltage over the period of a switching process in which the changeover switch 32 is moved from a second position, a contact between the center connection 36 with the second changeover contact 40, to a first position, a contact between the center connection 36 with the first changeover contact 38.
  • the center connection 36 is connected to the second changeover contact 40.
  • a first switching signal is sent via the driver stage 62 and the switching device 18 located therein.
  • the relay coil is activated in such a way that the toggle switch 32 is moved from the second position to the first position.
  • the changeover switch 32 is released from the second position, i.e. from the contact between the center connection 36 and the second changeover contact 40.
  • the voltage measured at the input 46 rises abruptly, until a maximum value U max is reached.
  • the switching process can thus also be recognized here as a digital level change.
  • the switching point in time t 3 can correspond, for example, to a point in time at which a previously established threshold value is exceeded.
  • Figure 6 shows an exemplary representation of the at input 46 of the control device 24 of the switching arrangement according to FIG Figure 4 applied voltage over the period of a switching process in which the changeover switch 32 is switched from a first position to a second position.
  • a second switching signal is sent from the control device 24 via the driver stage 62 and the switching device 18 located therein.
  • the relay coil 14 is controlled in such a way that the changeover switch 32 is moved from the first position, that is, in connection with the first changeover contact 38, to a second position, that is, in connection with the second changeover contact 40.
  • the switching point in time t 5 can correspond, for example, to a point in time at which a previously defined threshold value is undershot.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Relay Circuits (AREA)
EP20177866.9A 2020-06-02 2020-06-02 Agencement de commutation et procédé de détermination du moment de commutation exact d'un relais électromécanique Pending EP3920202A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20177866.9A EP3920202A1 (fr) 2020-06-02 2020-06-02 Agencement de commutation et procédé de détermination du moment de commutation exact d'un relais électromécanique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20177866.9A EP3920202A1 (fr) 2020-06-02 2020-06-02 Agencement de commutation et procédé de détermination du moment de commutation exact d'un relais électromécanique

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EP3920202A1 true EP3920202A1 (fr) 2021-12-08

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115616281A (zh) * 2022-10-21 2023-01-17 广州普迩太科技有限公司 一种uDL2杂散电流测试仪及其检测方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6233132B1 (en) * 1998-09-03 2001-05-15 Ranco Incorporated Of Delaware Zero cross relay actuation method and system implementing same
US20130342950A1 (en) * 2012-06-26 2013-12-26 Abl Ip Holding Llc Systems and Methods for Determining Actuation Duration of a Relay
US20140002093A1 (en) * 2012-06-27 2014-01-02 Leviton Manufacturing Co., Inc. Relay contact monitoring and control
EP2720325A1 (fr) * 2012-10-12 2014-04-16 GIRA GIERSIEPEN GmbH & Co. KG Prise commutable
WO2020020555A1 (fr) * 2018-07-24 2020-01-30 BSH Hausgeräte GmbH Procédé et unité de commande pour mettre sous tension ou hors tension un relais

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6233132B1 (en) * 1998-09-03 2001-05-15 Ranco Incorporated Of Delaware Zero cross relay actuation method and system implementing same
US20130342950A1 (en) * 2012-06-26 2013-12-26 Abl Ip Holding Llc Systems and Methods for Determining Actuation Duration of a Relay
US20140002093A1 (en) * 2012-06-27 2014-01-02 Leviton Manufacturing Co., Inc. Relay contact monitoring and control
EP2720325A1 (fr) * 2012-10-12 2014-04-16 GIRA GIERSIEPEN GmbH & Co. KG Prise commutable
WO2020020555A1 (fr) * 2018-07-24 2020-01-30 BSH Hausgeräte GmbH Procédé et unité de commande pour mettre sous tension ou hors tension un relais

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115616281A (zh) * 2022-10-21 2023-01-17 广州普迩太科技有限公司 一种uDL2杂散电流测试仪及其检测方法

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