EP2513938B1 - Apparatus for an electromagnetic switching device - Google Patents
Apparatus for an electromagnetic switching device Download PDFInfo
- Publication number
- EP2513938B1 EP2513938B1 EP10704533.8A EP10704533A EP2513938B1 EP 2513938 B1 EP2513938 B1 EP 2513938B1 EP 10704533 A EP10704533 A EP 10704533A EP 2513938 B1 EP2513938 B1 EP 2513938B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- switch
- coil
- current
- control signal
- pick
- 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.)
- Not-in-force
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Classifications
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- 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
- H01H47/32—Energising current supplied by semiconductor device
- H01H47/325—Energising current supplied by semiconductor device by switching regulator
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- 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
- H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
- H01H47/04—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay for holding armature in attracted position, e.g. when initial energising circuit is interrupted; for maintaining armature in attracted position, e.g. with reduced energising current
Definitions
- the present invention relates to an apparatus for driving a coil of an electromagnetic switching device.
- An electromagnetic switching device is typically used for controlling flow of electrical current in an electrical circuit.
- the electromagnetic switching device is controllable for switching between on and off states for closing and breaking a power supply circuit.
- the electromagnetic switching device may be manually or electrically controlled.
- magnets may be employed to actuate a movable contact element for breaking and closing the power supply circuit.
- the movable contact element is moved to engagement with a stationary contact element for closing the power supply circuit.
- the stationary contact element is electrically connected to the power supply.
- the power supply circuit is closed when movable contact element is in engagement with the stationary contact element.
- the magnets employed to actuate the movable contact element are energized by a coil.
- the coil is energized by a current flowing through the coil.
- DE 299 09 904 U1 discloses an apparatus for driving a coil which reduces electrical losses at switches.
- switches are controlled based on pre-determined switching time.
- the first switch supplies the pick-up current to the coil and the second switch supplies the hold-on current to the coil.
- the pick-up current is the current required for energizing the coil for the circuit closing motion of the contact element.
- the hold-on current is the current required for maintaining the contact element in the circuit closing position.
- the first switch and the second switch may be controlled responsive to a current flowing through the coil. Providing the pick-up current using the first switch and the hold-on current using the second switch enables in reducing the electrical losses at the switches as the heat dissipation is reduced at the switches.
- a controller is configured to detect decrease in the current flowing through the coil, and turn-off the first switch and turn-on the second switch upon detecting decrease in the current flowing through the coil.
- the first switch and the second switch are different with respect to a switching frequency.
- the pick-up current is typically of a higher value than the hold-on current, the switches having different switching frequencies enable in efficient operation of the switches.
- the first switch and the second switch are solid state switches.
- the first switch and the second switch being connected in parallel to each other. Connecting the first switch and the second switch in parallel enables in achieving two different current paths from the supply source. This enables in controlling the pick-up current and the hold-on current provided to the coil.
- the first switch and the second switch connected in parallel is connected in series to the coil. Connecting the parallel connected first switch and the second switch in series with the coil enables in providing the pick-up current and the hold-on current over two different current paths.
- the apparatus may further comprises a controller configured to provide a fist control signal to the first switch and a second control signal to the second switch responsive to the current flowing through the coil.
- the controller responsive to the current flowing though the coil may provide the first control signal to the first switch and the second control signal to the second switch for controlling the switches respectively.
- the first control signal is provided to the first switch for providing the pick-up current the coil.
- the first control signal is provided to the first switch responsive to the current flowing through the coil. This enables in controlling the first switch for providing the pick-up current to the coil.
- the first switch is adapted to be in an on state during a circuit closing motion of a contact element.
- the first switch adapted to be in an on state during the circuit closing motion enables in providing the pick-up current to the coil.
- the second control signal is provided to the second switch for providing the hold-on current to the coil.
- the second control signal is provided to the second switch responsive to the current flowing through the coil. This enables in controlling the second switch for providing the hold-on current to the coil.
- the second switch is adapted to perform a high frequency switching responsive to the second control signal. Performing a high frequency switching responsive to the second control signal enables in reducing the current provided to the coil and thus, provide the hold-on current to the coil.
- the second control signal is a pulse width modulated signal.
- the pulse width modulated signal enables the switch to perform high frequency switching based responsive to the widths of the pulses.
- the switching frequency of the first switch is less than the second switch.
- the first switch providing the pick-up may not be required to perform high frequency switching.
- the switching frequency of the first switch may be lower than the switching frequency of the second switch. This enables in reducing the electrical losses at the first switch.
- the first switch is selected from the group consisting of a transistor, and an IGBT.
- the first switch being a transistor or an IGBT may operate efficiently to supply the pick-up current as the pick-up current is of a higher value than the hold-on current.
- the second switch is an MOSFET.
- the second switch being an MOSFET may operate efficiently to supply the hold-on current as MOSFET operate efficiently at high switching frequency.
- Another embodiment includes, an electromagnetic switching device comprising the apparatus according to any of the claims 1 to 14.
- a carrier 1 of an electromagnetic switching device is illustrated according to an embodiment herein.
- a contact element 3 is supported in the carrier to be movable form a circuit breaking position to a circuit closing position, wherein the contact element 3 is moved to be in contact with a stationary contact element to be in the circuit closing position.
- the stationary contact may be connected to the input power supply.
- FIG 1b illustrates an assembly of an electromagnet system and the carrier 1 of FIG 1a according to an embodiment herein.
- the carrier 1 comprises a column 7 extending vertically upwards.
- the electromagnet system 8 is supported on the column 7 to actuate the carrier.
- the electromagnet system 8 is shown as comprising electromagnetic armatures 9, 13.
- the electromagnet system 8 may be designed in another way comprising fewer or more electromagnetic armatures.
- the electromagnetic armatures 9, 13 are adapted to actuate the carrier 1.
- the electromagnetic armature 9 engages the column 7 via a member 11 for transferring the armature 9 movement to the carrier 1.
- the carrier 1 in turn moves the contact element 3 into the circuit closing position.
- the electromagnetic armature 9 is in engagement with the column mechanically via the member 11.
- the electromagnetic armature 9 may be engaged with the column 7 using other known mechanical means.
- Another electromagnetic armature 13 comprising coils 17 is also supported on the column 7.
- the magnetic armature may comprise only a single coil 17.
- the coils 17 are energized by supplying a current provided by a supply source.
- the electromagnetic armature 9 is drawn towards the electromagnetic armature 13. This movement of the armature 9 is transferred to the carrier 1 and to the contact element 3 for the circuit closing motion.
- the carrier 1 may comprise a column extending vertically downwards and the electromagnetic armature 9 and the electromagnetic armature 13 may be supported on the column.
- the contact element 3 In the circuit closing motion, the contact element 3 is moved to be in contact with the stationary contact element.
- the contact element 3 in contact with the stationary contact element is said to be in the circuit closing position.
- the current required for energizing the coil 17 for the circuit closing motion of the contact element 3 is hereinafter referred to as a pick-up current.
- the current required for energizing the coil 17 such that the contact element 3 is maintained at the circuit closing position is referred to as a hold-on current.
- FIG 2 illustrates a schematic diagram of an apparatus 18 for supplying the pick-up current and the hold-on current to the coil according to an embodiment herein.
- a pick-up current for energizing the coil 17 is provided to the coil 17 using a switch 19 and a hold-on current is provided by a switch 21.
- the switch 19 is operable for providing the pick-up current to the coil 17 during circuit closing motion and the switch 21 is operable for providing the hold-on current to the coil 17 for maintaining the contact element 3 of FIG 1a in a circuit closing position.
- the switch 19 and the switch 21 may be solid state static switches.
- a controller 23 is configured to control the switch 19 for providing the pick-up current to the coil 17 during circuit closing motion and the switch 21 for providing the hold-current to the coil 17 for maintaining the contact element 3 of FIG 1 at the circuit closing position.
- the controller 23 controls the switch 19 and switch 21 responsive to the current flowing in the coil 17.
- the current flowing in the coil 17 is provided to the controller 23 by a conditioning circuit 25.
- the controller 23 may be a processor, a microcontroller, and the like.
- the conditioning circuit 25 is connected at A across a resistor R27 on the circuit providing the current to the coil 17.
- a voltage across A is conditioned by the conditioned circuit 25 and is thereafter, provided to the controller 23.
- the controller 23 determines the current flowing through the coil 17 responsive to the output of the conditioning circuit 25.
- the pick-up current is to be provided to the coil 17 for energizing the coil 17.
- the switch 19 is turned on to provide the pick-up current to the coil 17.
- the controller 23 may control the switch 19 by providing a first control signal. Once, the contact element 3 is in contact with the stationary contact element, the current flowing through the coil 17 decreases. This decrease in the current flowing through the coil 17 is detected by the controller 23.
- the controller 23 in response to the decrease in the current turns off the switch 19 and turns on the switch 21.
- the switch 21 is operable for high frequency switching to provide the hold-on current to the coil 17.
- the switch 21 performs the high frequency switching responsive to a second control signal, such as a PWM pulse, provided by the controller 23.
- the high frequency switching performed by the switch 21 reduces the current flowing through the coil 17 and thus provides the hold-on current to the coil 17 to maintain the contact element 3 in the circuit closing position.
- the use of two switches 19, 21 for providing the pick-up current and the hold-on current to the coil 17 respectively reduces electrical losses occurring at the switches 19, 21.
- the switch 19 may be a solid state static switch selected such that it is suitable for carrying high currents and the switch 21 may be a solid state static switch selected such that it is capable of performing high frequency switching with minimum switching loses.
- the switching frequency of the first switch 19 may be less than the switching frequency of the second switch 21.
- the switch 19 may be a transistor, such as an IGBT and the switch 21 may be an MOSFET.
- An IGBT is capable of carrying high currents and an MOSFET is capable of performing high frequency switching with minimum switching loses.
- the switch 19 is suitable for carrying high currents and the switch 21 is suitable for high frequency switching with minimum switching loses
- the electrical losses occurring at the switches 19, 21 are reduced, thus reducing the heat dissipation at the switches 19, 21.
- This enables in eliminating the requirement of using bulky heat sinks and thus reduction in size of the electromagnetic switching device. Additionally, the longevity of the switches 19, 21 is increased due to the reduction in heat generated.
- the switch 19 may be turned on to provide the pick-up current to the coil 17 and the switch 21 also may be turned on to carry a fraction of the pick-up current.
- the controller 23 may provide control signals to the first switch 19 and the second switch 21 respectively to turn on both the switches 19, 21 during circuit closing motion. This enables in further reducing the electrical losses at the switch 19, thus reducing the heat generated at the switch 19.
- the switch 21 may be turned on to provide the hold-on current to the coil 17 and the switch 19 may also be turned on to carry a fraction of the hold-on current.
- the controller 23 may provide control signals to the first switch 19 and the second switch 21 respectively to turn on both the switches 19, 21 for maintaining the contact element 3 in circuit closing position. This enables in further reducing the electrical loses at the switch 21, thus reducing heat generated at the switch 21.
- the embodiments described herein enable reducing electrical losses occurring at the switch, thereby reducing the heat dissipation at the switch. This enables in eliminating the requirement of using bulky heat sinks and thus reduction in size of the electromagnetic switching device. Additionally, the longevity of the switches is increased due to the reduction in the heat dissipated. This enables in providing efficient switching in order to provide the pick-up current and the hold-on current to the coil.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Relay Circuits (AREA)
Description
- The present invention relates to an apparatus for driving a coil of an electromagnetic switching device.
- An electromagnetic switching device is typically used for controlling flow of electrical current in an electrical circuit. The electromagnetic switching device is controllable for switching between on and off states for closing and breaking a power supply circuit. The electromagnetic switching device may be manually or electrically controlled. To control the electromagnetic switching device electrically, magnets may be employed to actuate a movable contact element for breaking and closing the power supply circuit.
- Typically, the movable contact element is moved to engagement with a stationary contact element for closing the power supply circuit. The stationary contact element is electrically connected to the power supply. Thus, the power supply circuit is closed when movable contact element is in engagement with the stationary contact element. The magnets employed to actuate the movable contact element are energized by a coil. The coil is energized by a current flowing through the coil.
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DE 299 09 904 U1 discloses an apparatus for driving a coil which reduces electrical losses at switches. In this apparatus, switches are controlled based on pre-determined switching time. - It is an object of the embodiments of the invention to measure to reduce electrical losses occurring at a switch driving the coil in an electromagnetic switching device.
- The above object is achieved by an apparatus for driving a coil of an electromagnetic switching device according to
claim 1. - The first switch supplies the pick-up current to the coil and the second switch supplies the hold-on current to the coil. The pick-up current is the current required for energizing the coil for the circuit closing motion of the contact element. The hold-on current is the current required for maintaining the contact element in the circuit closing position. The first switch and the second switch may be controlled responsive to a current flowing through the coil. Providing the pick-up current using the first switch and the hold-on current using the second switch enables in reducing the electrical losses at the switches as the heat dissipation is reduced at the switches. A controller is configured to detect decrease in the current flowing through the coil, and turn-off the first switch and turn-on the second switch upon detecting decrease in the current flowing through the coil.
- According to the invention, the first switch and the second switch are different with respect to a switching frequency. As the pick-up current is typically of a higher value than the hold-on current, the switches having different switching frequencies enable in efficient operation of the switches.
- According to another embodiment, wherein the first switch and the second switch are solid state switches.
- According to yet another embodiment, the first switch and the second switch being connected in parallel to each other. Connecting the first switch and the second switch in parallel enables in achieving two different current paths from the supply source. This enables in controlling the pick-up current and the hold-on current provided to the coil. According to yet another embodiment, the first switch and the second switch connected in parallel is connected in series to the coil. Connecting the parallel connected first switch and the second switch in series with the coil enables in providing the pick-up current and the hold-on current over two different current paths.
- According to yet another embodiment, the apparatus may further comprises a controller configured to provide a fist control signal to the first switch and a second control signal to the second switch responsive to the current flowing through the coil. The controller responsive to the current flowing though the coil may provide the first control signal to the first switch and the second control signal to the second switch for controlling the switches respectively.
- According to yet another embodiment, the first control signal is provided to the first switch for providing the pick-up current the coil. The first control signal is provided to the first switch responsive to the current flowing through the coil. This enables in controlling the first switch for providing the pick-up current to the coil.
- According to yet another embodiment, the first switch is adapted to be in an on state during a circuit closing motion of a contact element. The first switch adapted to be in an on state during the circuit closing motion enables in providing the pick-up current to the coil.
- According to yet another embodiment, the second control signal is provided to the second switch for providing the hold-on current to the coil. The second control signal is provided to the second switch responsive to the current flowing through the coil. This enables in controlling the second switch for providing the hold-on current to the coil.
- According to yet another embodiment, the second switch is adapted to perform a high frequency switching responsive to the second control signal. Performing a high frequency switching responsive to the second control signal enables in reducing the current provided to the coil and thus, provide the hold-on current to the coil.
- According to yet another embodiment, wherein the second control signal is a pulse width modulated signal. The pulse width modulated signal enables the switch to perform high frequency switching based responsive to the widths of the pulses.
- According to yet another embodiment, the switching frequency of the first switch is less than the second switch. The first switch providing the pick-up may not be required to perform high frequency switching. Thus, the switching frequency of the first switch may be lower than the switching frequency of the second switch. This enables in reducing the electrical losses at the first switch.
- According to yet another embodiment, wherein the first switch is selected from the group consisting of a transistor, and an IGBT. The first switch being a transistor or an IGBT may operate efficiently to supply the pick-up current as the pick-up current is of a higher value than the hold-on current.
- According to yet another embodiment, the second switch is an MOSFET. The second switch being an MOSFET may operate efficiently to supply the hold-on current as MOSFET operate efficiently at high switching frequency.
- Another embodiment includes, an electromagnetic switching device comprising the apparatus according to any of the
claims 1 to 14. - Embodiments of the present invention are further described hereinafter with reference to illustrated embodiments shown in the accompanying drawings, in which:
- FIG 1a
- illustrates a carrier of an electromagnetic switching device according to an embodiment herein,
- FIG 1b
- illustrates an assembly of an electromagnet system and the
carrier 1 ofFIG 1a according to an embodiment herein, and - FIG 2
-
FIG 2 illustrates a schematic diagram of an apparatus for supplying the pick-up current and the hold-on current to the coil according to an embodiment herein. - Various embodiments are described with reference to the drawings, wherein like reference numerals are used to refer to like elements throughout. In the following description, for purpose of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident that such embodiments may be practiced without these specific details.
- Referring to
FIG. 1a , acarrier 1 of an electromagnetic switching device is illustrated according to an embodiment herein. Acontact element 3 is supported in the carrier to be movable form a circuit breaking position to a circuit closing position, wherein thecontact element 3 is moved to be in contact with a stationary contact element to be in the circuit closing position. The stationary contact may be connected to the input power supply. -
FIG 1b illustrates an assembly of an electromagnet system and thecarrier 1 ofFIG 1a according to an embodiment herein. In the shown example ofFIG 1b , thecarrier 1 comprises acolumn 7 extending vertically upwards. The electromagnet system 8 is supported on thecolumn 7 to actuate the carrier. In the present embodiment, the electromagnet system 8 is shown as comprisingelectromagnetic armatures electromagnetic armatures carrier 1. Theelectromagnetic armature 9 engages thecolumn 7 via amember 11 for transferring thearmature 9 movement to thecarrier 1. Thecarrier 1 in turn moves thecontact element 3 into the circuit closing position. In the shown example ofFIG 1b , theelectromagnetic armature 9 is in engagement with the column mechanically via themember 11. However, theelectromagnetic armature 9 may be engaged with thecolumn 7 using other known mechanical means. Anotherelectromagnetic armature 13 comprisingcoils 17 is also supported on thecolumn 7. In the shown example ofFIG 1b twocoils 17 have been illustrated. However, in certain implementations the magnetic armature may comprise only asingle coil 17. Thecoils 17 are energized by supplying a current provided by a supply source. On thecoils 17 being energized, theelectromagnetic armature 9 is drawn towards theelectromagnetic armature 13. This movement of thearmature 9 is transferred to thecarrier 1 and to thecontact element 3 for the circuit closing motion. However, in other embodiments, thecarrier 1 may comprise a column extending vertically downwards and theelectromagnetic armature 9 and theelectromagnetic armature 13 may be supported on the column. - In the circuit closing motion, the
contact element 3 is moved to be in contact with the stationary contact element. Thecontact element 3 in contact with the stationary contact element is said to be in the circuit closing position. The current required for energizing thecoil 17 for the circuit closing motion of thecontact element 3 is hereinafter referred to as a pick-up current. Once thecontact element 3 is moved to the circuit closing position, the current required for energizing thecoil 17 such that thecontact element 3 is maintained at the circuit closing position is referred to as a hold-on current. -
FIG 2 illustrates a schematic diagram of anapparatus 18 for supplying the pick-up current and the hold-on current to the coil according to an embodiment herein. In the example ofFIG 2 , a pick-up current for energizing thecoil 17 is provided to thecoil 17 using aswitch 19 and a hold-on current is provided by aswitch 21. Theswitch 19 is operable for providing the pick-up current to thecoil 17 during circuit closing motion and theswitch 21 is operable for providing the hold-on current to thecoil 17 for maintaining thecontact element 3 ofFIG 1a in a circuit closing position. - For example, the
switch 19 and theswitch 21 may be solid state static switches. - Still referring to
FIG 2 , acontroller 23 is configured to control theswitch 19 for providing the pick-up current to thecoil 17 during circuit closing motion and theswitch 21 for providing the hold-current to thecoil 17 for maintaining thecontact element 3 ofFIG 1 at the circuit closing position. Thecontroller 23 controls theswitch 19 and switch 21 responsive to the current flowing in thecoil 17. The current flowing in thecoil 17 is provided to thecontroller 23 by aconditioning circuit 25. Thecontroller 23 may be a processor, a microcontroller, and the like. - In an example, the
conditioning circuit 25 is connected at A across a resistor R27 on the circuit providing the current to thecoil 17. A voltage across A is conditioned by the conditionedcircuit 25 and is thereafter, provided to thecontroller 23. Thecontroller 23 determines the current flowing through thecoil 17 responsive to the output of theconditioning circuit 25. - For example, during a circuit closing motion, the pick-up current is to be provided to the
coil 17 for energizing thecoil 17. During the circuit closing motion, theswitch 19 is turned on to provide the pick-up current to thecoil 17. Thecontroller 23 may control theswitch 19 by providing a first control signal. Once, thecontact element 3 is in contact with the stationary contact element, the current flowing through thecoil 17 decreases. This decrease in the current flowing through thecoil 17 is detected by thecontroller 23. Thecontroller 23 in response to the decrease in the current turns off theswitch 19 and turns on theswitch 21. Theswitch 21 is operable for high frequency switching to provide the hold-on current to thecoil 17. Theswitch 21 performs the high frequency switching responsive to a second control signal, such as a PWM pulse, provided by thecontroller 23. The high frequency switching performed by theswitch 21 reduces the current flowing through thecoil 17 and thus provides the hold-on current to thecoil 17 to maintain thecontact element 3 in the circuit closing position. The use of twoswitches coil 17 respectively reduces electrical losses occurring at theswitches - The
switch 19 may be a solid state static switch selected such that it is suitable for carrying high currents and theswitch 21 may be a solid state static switch selected such that it is capable of performing high frequency switching with minimum switching loses. The switching frequency of thefirst switch 19 may be less than the switching frequency of thesecond switch 21. In an embodiment, theswitch 19 may be a transistor, such as an IGBT and theswitch 21 may be an MOSFET. An IGBT is capable of carrying high currents and an MOSFET is capable of performing high frequency switching with minimum switching loses. - As the
switch 19 is suitable for carrying high currents and theswitch 21 is suitable for high frequency switching with minimum switching loses, the electrical losses occurring at theswitches switches switches - In an alternate embodiment, during the circuit closing motion, the
switch 19 may be turned on to provide the pick-up current to thecoil 17 and theswitch 21 also may be turned on to carry a fraction of the pick-up current. Thecontroller 23 may provide control signals to thefirst switch 19 and thesecond switch 21 respectively to turn on both theswitches switch 19, thus reducing the heat generated at theswitch 19. Similarly, for maintaining thecontact element 3 ofFIG 1a in circuit closing position, theswitch 21 may be turned on to provide the hold-on current to thecoil 17 and theswitch 19 may also be turned on to carry a fraction of the hold-on current. Thecontroller 23 may provide control signals to thefirst switch 19 and thesecond switch 21 respectively to turn on both theswitches contact element 3 in circuit closing position. This enables in further reducing the electrical loses at theswitch 21, thus reducing heat generated at theswitch 21. - The embodiments described herein enable reducing electrical losses occurring at the switch, thereby reducing the heat dissipation at the switch. This enables in eliminating the requirement of using bulky heat sinks and thus reduction in size of the electromagnetic switching device. Additionally, the longevity of the switches is increased due to the reduction in the heat dissipated. This enables in providing efficient switching in order to provide the pick-up current and the hold-on current to the coil.
- While this invention has been described in detail with reference to certain preferred embodiments, it should be appreciated that the present invention is not limited to those precise embodiments. Rather, in view of the present disclosure which describes the current best mode for practicing the invention, many modifications and variations would present themselves, to those of skill in the art without departing from the scope of the invention as defined by the appended claims. The scope of the invention is, therefore, indicated by the following claims rather than by the foregoing description. All changes, modifications, and variations coming within the meaning and range of equivalency of the claims are to be considered within their scope.
Claims (14)
- An apparatus (18) for driving a coil (17) of an electromagnetic switching device, the apparatus (18) comprising:a first switch (19) to supply a pick-up current to the coil (17),a second switch (21) to supply a hold-on current to the coil (17), andwherein the first switch (19) and the second switch (21) are different with respect to a switching frequency,characterized by the first switch (19) and the second switch (21) being controllable responsive to a current flowing through the coil (17) and by a controller (23) configured to detect a decrease in the current flowing through the coil (17), and configured to turn-off the first switch (19) and to turn-on the second switch (21) in response to the detected decrease in the current flowing through the coil (17).
- The apparatus (18) according to claim 1, wherein the first switch (19) and the second switch (21) are solid state switches.
- The apparatus (18) according to any one of the claims 1 to 2, wherein the first switch (19) and the second switch (21) being connected in parallel to each other.
- The apparatus (18) according to claim 3, wherein the first switch (19) and the second switch (21) connected in parallel is connected in series to the coil (17).
- The apparatus (18) according to claim 1, wherein the controller (23) is configured to provide a first control signal to the first switch (19) and a second control signal to the second switch (21) responsive to the current flowing through the coil (17).
- The apparatus (18) according to claim 5, wherein the first control signal is provided to the first switch (19) for providing the pick-up current the coil.
- The apparatus (18) according to any one of the claims 1 to 6, wherein the first switch (19) is adapted to be in an on state during a circuit closing motion of a contact element (3) .
- The apparatus (18) according to any one of the claims 5 to 7, wherein the second control signal is provided to the second switch (21) for providing the hold-on current to the coil (17).
- The apparatus (18) according to any one of the claims 5 to 7, wherein the second switch (21) is adapted to perform a high frequency switching responsive to the second control signal.
- The apparatus (18) according to any one of the claims 5 to 9, wherein the second signal is a pulse width modulated signal.
- The apparatus (18) according to any one of the claims 1 to 10 wherein the switching frequency of the first switch (19) is less than the second switch (21).
- The apparatus (18) according to any one of the claims 1 to 11, wherein the first switch (19) is selected from the group consisting of a transistor, and an IGBT.
- The apparatus (18) according to any one of the claims 1 to 12, wherein the second switch (21) is an MOSFET.
- An electromagnetic switching device comprising the apparatus (18) according to any of the previous claims.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2010/051477 WO2011095223A1 (en) | 2010-02-08 | 2010-02-08 | Apparatus for an electromagnetic switching device |
Publications (2)
Publication Number | Publication Date |
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EP2513938A1 EP2513938A1 (en) | 2012-10-24 |
EP2513938B1 true EP2513938B1 (en) | 2018-07-04 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP10704533.8A Not-in-force EP2513938B1 (en) | 2010-02-08 | 2010-02-08 | Apparatus for an electromagnetic switching device |
Country Status (3)
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EP (1) | EP2513938B1 (en) |
CN (1) | CN102754176B (en) |
WO (1) | WO2011095223A1 (en) |
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FR3006817B1 (en) * | 2013-06-10 | 2016-11-18 | Hispano Suiza Sa | DEVICE AND METHOD FOR ASSISTING AN ELECTRIC GENERATION SYSTEM OF AN AIRCRAFT |
EP3069364B1 (en) * | 2013-11-12 | 2018-03-07 | ABB Schweiz AG | Method for controlling a contactor device, and control unit |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5053911A (en) * | 1989-06-02 | 1991-10-01 | Motorola, Inc. | Solenoid closure detection |
DE29909904U1 (en) * | 1999-06-08 | 1999-09-30 | Moeller Gmbh | Drive control |
DE19935045A1 (en) * | 1999-07-26 | 2001-02-01 | Moeller Gmbh | Electronic drive control |
EP1109178A3 (en) * | 1999-12-16 | 2002-04-17 | Siemens Aktiengesellschaft | Method for switching an inductive load |
JP2008192481A (en) * | 2007-02-06 | 2008-08-21 | Yazaki Corp | Relay control device |
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2010
- 2010-02-08 WO PCT/EP2010/051477 patent/WO2011095223A1/en active Application Filing
- 2010-02-08 CN CN201080063401.1A patent/CN102754176B/en not_active Expired - Fee Related
- 2010-02-08 EP EP10704533.8A patent/EP2513938B1/en not_active Not-in-force
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Publication number | Publication date |
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EP2513938A1 (en) | 2012-10-24 |
CN102754176A (en) | 2012-10-24 |
WO2011095223A1 (en) | 2011-08-11 |
CN102754176B (en) | 2015-12-02 |
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