WO2014020262A1 - Circuit d'alimentation - Google Patents
Circuit d'alimentation Download PDFInfo
- Publication number
- WO2014020262A1 WO2014020262A1 PCT/FR2013/051781 FR2013051781W WO2014020262A1 WO 2014020262 A1 WO2014020262 A1 WO 2014020262A1 FR 2013051781 W FR2013051781 W FR 2013051781W WO 2014020262 A1 WO2014020262 A1 WO 2014020262A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- switch
- terminal
- coil
- input terminal
- state
- Prior art date
Links
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
- H01H47/22—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
- H01H47/26—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 having thermo-sensitive input
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H89/00—Combinations of two or more different basic types of electric switches, relays, selectors and emergency protective devices, not covered by any single one of the other main groups of this subclass
- H01H89/04—Combination of a thermally actuated switch with a manually operated switch
-
- 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
- H01H47/226—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 for bistable relays
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/002—Thermally-actuated switches combined with protective means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/02—Details
- H01H37/32—Thermally-sensitive members
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
- H02H5/042—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using temperature dependent resistors
Definitions
- the present invention relates to the general field of power supply circuits. It is more specifically a power supply circuit for electronic equipment likely to be affected by overheating or fire, for example an electronic card of an aircraft engine computer.
- the document FR 2 957 667 describes a device and a method for detecting an overheating affecting an aircraft engine computer.
- the computer When overheating is detected, the computer generates a shutdown signal which has the effect of ordering the closing of a fuel shutoff valve.
- the engine is no longer fueled, which prevents the engine from leaving uncontrolled overspeed.
- the shutdown signal may have the effect of ordering a disconnection of the actuators from the engine (other than the fuel shutoff valve) and stopping their power supply.
- the pilot generates a reset signal of the computer (for example by operating a fuel cut-off switch from an ON position to an OFF position) while the superheat is still present, the cut-off signal 'is no longer generated which can also result in a restart of the engine.
- a possible lock consists of storing the overheating information detected in a non-volatile memory of the computer.
- the computer will order a further shutdown of the motor and the power of the actuators with this information stored in non-volatile memory.
- the driver has no way to restart the engine, the lock making the cut irreversible.
- this can be very restrictive in the case where the other engine of the aircraft is also out of order or in case of inadvertent detection of overheating.
- the invention proposes a supply circuit for electronic equipment likely to be affected by overheating or fire, comprising:
- This power circuit is remarkable in that it comprises:
- bistable switch switchable between a first state in which the input terminal is connected to the output terminal and a second state in which the input terminal is not connected to the output terminal
- a first switch controlled by a cut-off signal between the input terminal and a series circuit comprising a thermal resistance and a first coil, said series circuit being between said first switch and a ground terminal,
- the bistable switch in the second state, connects the input terminal to the series circuit on the opposite side to the ground terminal, and in the first state, the bistable switch does not connect the input terminal to the series circuit on the opposite side to the ground terminal,
- the bistable switch being configured to switch to the first state when the magnetic field induced by the second coil is greater than the magnetic field induced by the first coil, and to switch to the second state when the magnetic field induced by the first coil is greater than the magnetic field induced by the second coil.
- the invention proposes a computer for an aircraft engine, comprising at least one power supply circuit according to the invention and an electronic card powered by said power supply circuit.
- the invention proposes an aircraft comprising a computer according to the invention and a switch that can be manipulated by the pilot between a first position and a second position, in which the supply circuit comprises a control module able to generate temporarily the reset signal in response to a transition of a fuel cutoff signal representative of the switch position.
- the first switch closes and feeds the first coil, which has the effect of switch the bistable switch to its second state and thus cut the power supply of the electronic card. It avoids the issue of untimely commands by the electronic card, which may have the effect of restarting the engine.
- the power failure is reversible by the pilot. Indeed, by manipulating the switch to generate the reset signal, the driver can feed the second coil. Depending on the temperature and therefore the value of the thermal resistance, the magnetic fields induced by the coils maintain the bistable switch in its second state (if the superheat is still present) or control its switching to its first state (if overheating no longer present), thus allowing a recharge of the electronic card.
- the bistable switch comprises a first part able to connect the output terminal to either a first terminal connected to the input terminal or to a second floating terminal, and a second part able to connect a third connected terminal.
- the series circuit either to a fourth floating terminal or to a fifth terminal connected to the input terminal.
- the power supply circuit comprises a control module able to temporarily generate the reset signal in response to a transition of a fuel cut signal.
- the electronic card comprises means for detecting an overheating and means for generating said cut-off signal in response to the detection of overheating.
- FIG. 1 is a diagram showing, in its environment, an aircraft engine computer including a supply circuit according to one embodiment of the invention.
- FIG. 2 is an electrical diagram showing the supply circuit of FIG. 1. Detailed description of an embodiment
- FIG. 1 shows a system including an aircraft engine computer 10, a fuel pumping and metering unit (FPMU), a fuel cutoff switch 30, detection devices overheating 40A, 40B, a converter 50 and an actuator 60.
- FPMU fuel pumping and metering unit
- the computer 10 comprises a housing 11 in which there are electronic boards 12A, 12B and supply circuits 13A, 13B. Indeed, in known manner, the computer 10 comprises two control channels A and B redundant, to ensure its operation including in case of failure of one of its components.
- the electronic card 12A comprises in particular a control module 14A, a temperature sensor 15A and a protection module against overspeed 16A.
- the control module 14A is responsible for regulating the motor. It determines in particular a fuel flow instruction and control signals for the different actuators of the motor. In addition, depending on the signals provided by the temperature sensor 15A and by the superheating detection devices 40A and 40B, the control module 14A can detect an overheating or a fire affecting the computer 10. The detection can be carried out for example as described in the document FR 2 957 667 cited in the introduction.
- the overspeed protection module 16A provides a control signal CMD20A which serves to shut off the motor power when overheating is detected by the control module 14A.
- the signal CMD20A commands a servovalve 21 to open or close a shutoff valve 22 of the fueling and pumping unit 20.
- the supply circuit 13A receives, on an input terminal 17A, a supply voltage Va supplied by a source not shown, and supplies, via an output terminal 18A, the supply voltage Va to the electronic card 12A.
- the supply circuit 13A is shown in the housing 11 of the computer 10, separated from the electronic card 12A.
- the supply circuit 13A may be constituted, at least in part, by components on the electronic card 12A.
- the supply circuit 13A may be at least partly outside the housing 11.
- the supply circuit 13A also includes an interface 19A on which it receives the control signal CMD20A and a signal F representative of the position of the switch 30 of fuel cutoff.
- the electronic card 12B comprises in particular a control module 14B, a temperature sensor 15B and a protection module against overspeeds 16B.
- the supply circuit 13B comprises an input terminal 17B, an output terminal 18B and an interface 19B.
- the converter 50 generates a supply voltage V 0 , for example + 25V, from a source not shown, to supply the actuators of the motor.
- Figure 1 shows an actuator 60 which is for example a fuel metering device (FMV for "Fuel Metering Valve").
- FIG. 1 represents in particular control signals CMD50A and CMD50B (determined respectively by the channels A and B of the computer 10) whose function is to control the start or stop of the converter 50.
- control signals CMD60A and CMD60B (respectively determined by the channels A and B of the computer 10) whose function is to control the actuator 60.
- FIG. 1 shows the supply circuit 13A in more detail, and the electronic card 12A.
- the supply circuit 13B may have the same structure and will not be described in detail.
- the supply circuit 13A comprises a switch 70, a series circuit comprising a thermal resistor 72 and a coil 73 of inductance L A , a coil 75 of inductance L B , a switch 76, a control module 77 and a switch bistable 78.
- the bistable switch 78 is in practice a double switch having a portion for connecting the output terminal 18A to either a terminal 79 connected to the input terminal 17A or a floating terminal 80, and a portion for connecting a terminal 81 either to a floating terminal 82 or to a terminal 83 connected to the input terminal 17A.
- the two parts jointly switch, as represented by the line 84.
- the bistable switch 78 has a first state, shown in Figure 2, in which the terminal 81 and connected to the terminal 82 and the terminal 18A is connected to the terminal 79, and a second state not shown in which the terminal 81 and connected to the terminal 83 and the terminal 18A is connected to the terminal 80.
- the switch 70 is connected in series with the thermal resistor 72 and the coil 73 between the input terminal 17A and the ground, and is controlled by the control signal CMD20A. More precisely, when the control signal CMD20A has a logic value corresponding to the opening of the shut-off valve 22, the switch 70 is open and, when the control signal CMD20A has a logic value corresponding to the closure of the valve 22, the switch 70 is closed. In the second case, the thermal resistance 72 and the coil 73 are then powered via the switch.
- the switch 76 is connected in series with the coil 75 between the input terminal 17A and the ground, and is controlled by the control module 77 as a function of the signal F.
- control module 77 commands by default the In addition, in response to a transition of the signal F corresponding to a switching of the switch 30 from the ON position to the OFF position, the control module 77 generates a reset signal F 'to temporarily control closing switch 76, thereby supplying coil 75.
- terminal 81 is connected to the series circuit formed by the thermal resistance 72 and the coil 73, the side opposite the ground, so that when the switch 78 is in its second being, the coil 73 is powered independently of the opening or closing the switch 70.
- the thermal resistance 72 has a value Rth which decreases with the temperature T.
- the inductance L A of the coil 73 is smaller than the inductance L B of the coil 75: L A ⁇ L B.
- the value Rth of the thermal resistance 72 is dimensioned so that, for a equilibrium temperature T eq (for example 150 ° C) and for the same supply voltage Va, the intensity of the magnetic field induced by the coil 73 is equal to the intensity of the magnetic field induced by the coil 75.
- the bistable switch 78 is configured to switch according to the induced magnetic fields of the coils 73 and 75. More specifically, the bistable switch 78 switches to its first state shown in FIG. 2 if the magnetic field induced by the coil 75 is greater than the field In contrast, the bistable switch 78 switches to its second state, not shown, if the magnetic field induced by the coil 73 is greater than the magnetic field induced by the coil 75.
- FIG. 2 represents the nominal operation of the supply circuit 13A. In this situation :
- the coil 73 is powered neither through the switch 70 (open) nor through the bistable switch 78 (in its first state),
- the coil 75 is not powered (switch 76 open),
- the electronic card 12A is supplied via the bistable switch 78 in its first state which connects the input terminal 17A to the output terminal 18A.
- the computer 10 activates the cutoff command (control signal CMD20A).
- this has the effect of closing the switch 70.
- the coil 73 is supplied via the switch 70 (closed) and generates a magnetic field.
- the switch 76 is always open.
- the coil 75 is not powered and does not generate a magnetic field.
- the magnetic field induced by the coil 73 therefore has the effect of switching the bistable switch 78 to its second state.
- the power supply of the electronic card 12A is cut off, the transmission by the computer 10 of unwanted control signals that can have the effect of relighting the motor is avoided.
- the supply of the coil 73 via the bistable switch 78 ensures the irreversibility of the cut as long as the superheat is present.
- the cut is reversible by the pilot after disappearing from overheating.
- the control module 77 will temporarily control the closing of the switch 76, and therefore the supply of the coil 75.
- the coil 75 then generates an induced magnetic field.
- the bistable switch 78 remains in its second state. The supply of the electronic card 12A is not restored and the emission of unwanted control signals is avoided even after switching of the switch 30.
- the thermal resistance 72 will have a value Rth greater than its value at the equilibrium temperature T eq .
- the induced magnetic field of the coil 73 is smaller than the induced magnetic field of the coil 75 and the bistable switch 78 switches to its first state. The power supply of the electronic card 12A is thus restored.
- the operation of the supply circuit 13B is the same as that of the supply circuit 13A.
Landscapes
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Protection Of Static Devices (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1501533.2A GB2519032B (en) | 2012-08-02 | 2013-07-24 | A power supply circuit |
US14/418,754 US9887058B2 (en) | 2012-08-02 | 2013-07-24 | Power supply circuit |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1257550A FR2994350B1 (fr) | 2012-08-02 | 2012-08-02 | Circuit d'alimentation |
FR1257550 | 2012-08-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2014020262A1 true WO2014020262A1 (fr) | 2014-02-06 |
Family
ID=47080726
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2013/051781 WO2014020262A1 (fr) | 2012-08-02 | 2013-07-24 | Circuit d'alimentation |
Country Status (4)
Country | Link |
---|---|
US (1) | US9887058B2 (fr) |
FR (1) | FR2994350B1 (fr) |
GB (1) | GB2519032B (fr) |
WO (1) | WO2014020262A1 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016009155A1 (fr) * | 2014-07-18 | 2016-01-21 | Snecma | Procédé de commande d'une vanne d'arrêt bistable pour moteur d'aéronef |
FR3088425A1 (fr) * | 2018-11-13 | 2020-05-15 | Safran Aircraft Engines | Procede de detection d’un evenement thermique |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB648790A (en) * | 1948-02-02 | 1951-01-10 | Thomas Wylie Ross | Improvements in electrical remote control systems |
US3188529A (en) * | 1961-07-27 | 1965-06-08 | Cutler Hammer Inc | System for controlling electroresponsive means |
US3303391A (en) * | 1963-08-20 | 1967-02-07 | Akai Electric | Overheat-protecting device |
GB1111240A (en) * | 1966-12-13 | 1968-04-24 | Licentia Gmbh | Improvements relating to over-temperature protective arrangements for electrical apparatus |
US4418374A (en) * | 1982-09-29 | 1983-11-29 | Allen-Bradley Company | Latch relay drive circuit |
US8000079B2 (en) * | 2008-05-22 | 2011-08-16 | Silitek Electronics (Guangzhou) Co., Ltd. | Relay driving module and an electronic device incorporating the same |
-
2012
- 2012-08-02 FR FR1257550A patent/FR2994350B1/fr active Active
-
2013
- 2013-07-24 WO PCT/FR2013/051781 patent/WO2014020262A1/fr active Application Filing
- 2013-07-24 GB GB1501533.2A patent/GB2519032B/en active Active
- 2013-07-24 US US14/418,754 patent/US9887058B2/en active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB648790A (en) * | 1948-02-02 | 1951-01-10 | Thomas Wylie Ross | Improvements in electrical remote control systems |
US3188529A (en) * | 1961-07-27 | 1965-06-08 | Cutler Hammer Inc | System for controlling electroresponsive means |
US3303391A (en) * | 1963-08-20 | 1967-02-07 | Akai Electric | Overheat-protecting device |
GB1111240A (en) * | 1966-12-13 | 1968-04-24 | Licentia Gmbh | Improvements relating to over-temperature protective arrangements for electrical apparatus |
US4418374A (en) * | 1982-09-29 | 1983-11-29 | Allen-Bradley Company | Latch relay drive circuit |
US8000079B2 (en) * | 2008-05-22 | 2011-08-16 | Silitek Electronics (Guangzhou) Co., Ltd. | Relay driving module and an electronic device incorporating the same |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016009155A1 (fr) * | 2014-07-18 | 2016-01-21 | Snecma | Procédé de commande d'une vanne d'arrêt bistable pour moteur d'aéronef |
FR3023871A1 (fr) * | 2014-07-18 | 2016-01-22 | Snecma | Procede de commande d'un actionneur bistable pour moteur d'aeronef |
US10018073B2 (en) | 2014-07-18 | 2018-07-10 | Safran Aircraft Engines | Method for controlling a bistable shutoff valve for an aircraft engine |
RU2681403C2 (ru) * | 2014-07-18 | 2019-03-06 | Сафран Эркрафт Энджинз | Способ управления бистабильным вентилем выключения для авиационного двигателя |
FR3088425A1 (fr) * | 2018-11-13 | 2020-05-15 | Safran Aircraft Engines | Procede de detection d’un evenement thermique |
Also Published As
Publication number | Publication date |
---|---|
FR2994350B1 (fr) | 2014-08-22 |
US9887058B2 (en) | 2018-02-06 |
GB201501533D0 (en) | 2015-03-18 |
FR2994350A1 (fr) | 2014-02-07 |
US20150179383A1 (en) | 2015-06-25 |
GB2519032B (en) | 2019-12-18 |
GB2519032A (en) | 2015-04-08 |
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