EP3888111A1 - Device for protecting an electrical circuit, and electrical circuit comprising such a device - Google Patents
Device for protecting an electrical circuit, and electrical circuit comprising such a deviceInfo
- Publication number
- EP3888111A1 EP3888111A1 EP19806289.5A EP19806289A EP3888111A1 EP 3888111 A1 EP3888111 A1 EP 3888111A1 EP 19806289 A EP19806289 A EP 19806289A EP 3888111 A1 EP3888111 A1 EP 3888111A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuse
- current
- protection device
- conductor
- diagnostic system
- 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.)
- Granted
Links
- 239000004020 conductor Substances 0.000 claims abstract description 46
- 238000005259 measurement Methods 0.000 claims description 4
- 239000000523 sample Substances 0.000 claims description 2
- 230000004913 activation Effects 0.000 abstract 1
- 238000010891 electric arc Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 10
- 239000002360 explosive Substances 0.000 description 5
- 238000007664 blowing Methods 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000005474 detonation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 230000005355 Hall effect Effects 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012777 electrically insulating material Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
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
- H01H9/10—Adaptation for built-in fuses
- H01H9/106—Adaptation for built-in fuses fuse and switch being connected in parallel
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H39/00—Switching devices actuated by an explosion produced within the device and initiated by an electric current
- H01H39/006—Opening by severing a conductor
Definitions
- TITLE Protection device for an electrical circuit and electrical circuit equipped with such a device
- the present invention relates to a protection device for an electrical circuit, as well as an electrical circuit equipped with such a protection device.
- FR-3 041 143-B1 describes a hybrid protection device comprising a fuse and a pyrotechnic circuit breaker, also called “pyroelectric switch” or “pyrotechnic switch” or “pyroswitch” in English, connected in parallel with each other.
- An additional fuse connected in series with a power zone of the pyrotechnic circuit breaker generates an electrical voltage when it blows in the event of an electrical fault. This electrical voltage serves as a signal to activate the pyrotechnic circuit breaker.
- the protection device can thus be controlled independently.
- the invention intends to remedy more particularly by proposing a new protection device for an electrical circuit having increased reliability.
- the invention relates to a protection device for an electrical circuit configured to transmit an electric current.
- the protection device comprises:
- the breaking component comprising a control zone, capable of receiving a tripping signal, and a power zone for the passage of electric current,
- a diagnostic system comprising at least one sensor for measuring the current flowing in the fuse and a programmed electronic processing unit to detect a failure of the protection device according to the measured current values.
- the diagnostic system makes it possible to detect a failure of the protection device capable of preventing the pyrotechnic switch from cutting the current if necessary.
- such a protection device comprises one or more of the following characteristics, taken in any technically admissible combination:
- the protection device further comprises: a control circuit configured to generate and transmit the trigger signal to the control area of the cut-off component; a second fuse connected in series between the first conductor and the first fuse and able to supply a supply voltage to the control circuit, the control circuit being connected between the second fuse and the control zone of the breaking component;
- the diagnostic system includes an additional sensor arranged to measure the current flowing in the power zone of the breaking component
- the diagnostic system includes an additional sensor arranged to measure the current flowing through the second fuse;
- the diagnostic system includes an additional sensor arranged to measure the current flowing through the control zone of the breaking component
- the protection device comprises at least two breaking components, the respective power zones of which are connected in series with the second fuse between the first conductor and the second conductor, the diagnostic system comprising at least two sensors each arranged to measure the current which circulates in the control area of one of the cut-off components;
- the protection device comprises at least two cut-off components connected in parallel to the first fuse between the first conductor and the second conductor, the diagnostic system comprising at least two sensors each arranged to measure the current flowing in the control zone of one of the switching components;
- the diagnostic system further comprises a temperature probe and while the electronic processing unit is programmed to correct the current measurements supplied by the or each sensor as a function of the measured temperature; the electronic processing unit of the diagnostic system is connected to the control circuit and is further programmed to generate a triggering signal of the cut-off component when it detects a failure of the protection device;
- the breaking component is a pyrotechnic switch.
- the invention also relates to an electric circuit configured to be supplied by an electric current, the electric circuit being equipped with a protection device according to the invention.
- Figure 1 is a schematic representation of a protection device according to the invention and of an electrical circuit comprising this protection device;
- Figure 2 is a schematic representation of the protection device in Figure 1, when a second fuse is blown;
- Figure 3 is a representation similar to Figure 2, when the pyrotechnic circuit breaker is open;
- Figure 4 is a representation similar to Figure 3, when a first fuse is blown;
- FIG 5 is a block diagram of a protection method according to the invention.
- Figure 6 is a representation similar to Figure 1, for a protection device and a circuit according to a second embodiment of the invention.
- an electric circuit 1 configured to be supplied by an electric current I and equipped with a protection device 2.
- the electric circuit 1 comprises a load 3 and is intended to be connected to a source not shown of current, direct or alternating depending on the load 3.
- the protection device 2 is able to open the electrical circuit 1 when the latter is crossed by an electrical fault current.
- any electric current I having an intensity greater than or equal to a nominal value of current l n , also called nominal current l n .
- This nominal current value l n is defined as being the maximum value of the current expected to flow in the protection device 2 in normal operation. It is predetermined according to the nature of the circuit electric 1.
- the electric fault current is defined as the sum l n + ld, where ld designates an overcurrent.
- the maximum electrical potential difference that can be applied between the terminals of the protection device 2 by supplying the load 3, without interruption by the protection device 2, is called the nominal voltage value and denoted V n in the following.
- This nominal voltage value is also determined according to the nature of the electrical circuit. The choice of nominal current values l n and of nominal voltage value V n depends on the nature of the load 3 to be protected.
- the fault electric current l d is, for example, an overload current or a short-circuit current and constitutes a risk for the load 3 of the electric circuit 1.
- the protective device 2 comprises a first conductor 4 and a second conductor 6.
- the first conductor 4 forms an input conductor of the electric current
- the second conductor 6 forms an output conductor of the electric current.
- Load 3 is connected to the output conductor.
- the conductors 4 and 6 are configured to connect the protection device 2 to the rest of the electrical circuit 1 and thus for the passage of any electrical current.
- the electrical current I which flows between the conductors 4 and 6 is less than or equal to the nominal current value l n and the voltage electrical across conductors 4 and 6 is less than or equal to the nominal voltage V n .
- the protection device 2 also comprises a first fuse 8 and a second fuse 10 electrically connected in series between the conductors 4 and 6.
- the first fuse 8 is connected to the output conductor 6, while the second fuse 10 is connected in series between the input conductor 4 and the first fuse 8.
- Note 5 an intermediate conductor connecting fuses 8 and 10 to each other, which is therefore interposed between conductors 4 and 6.
- a fuse is a dipole whose terminals are electrically connected to each other only by a conductive element which is capable of being destroyed, generally by fusion due to the Joule effect, when an electric current which exceeds a threshold value.
- This threshold value is here called “breaking current”.
- the cut-off voltage of a fuse called “rated voltage” in English, is defined here as the value of electrical voltage at the terminals of the fuse from which the fuse cannot interrupt the flow of current when the element driver was destroyed.
- a fuse is said to be “blown” when the conductive element has been destroyed and that no electric arc can form taking into account the values of the electric voltages present in the electric circuit 1. It then forms an electrically open circuit through which no electric current can flow.
- a fuse is said to be “blowing” when the electric current passing through it has exceeded the breaking current, causing the conductive element to start to melt, but the electric voltage across its terminals is higher than the breaking voltage. of this fuse, causing the appearance of an electric arc between its terminals. The electric arc continues as long as the fuse is blowing.
- the first and second fuses 8 and 10 have different ratings.
- the breaking current l 8 of the first fuse 8 is much lower than the nominal value I n ,.
- markedly is meant that the breaking current is at least four times, for example ten times or fifty times lower than the nominal value l n .
- This dimensioning is made possible by the fact that the first fuse 8 is not normally intended to be crossed by the nominal current l n .
- the breaking current ho of the second fuse 10 is equal, in practice to 1% or 3%, to the nominal value l n .
- the breaking current l 8 of the first fuse 8 is much lower than the breaking current ho of the second fuse 10.
- the cut-off voltage V 8 of the first fuse 8 is, in practice to within 1% or 3%, the nominal value V n .
- the cut-off voltage Vio of the second fuse 10 is much lower than the nominal value V n .
- “clearly” is meant that the cut-off voltage is at least four times, for example five times or ten times lower than the nominal value V n .
- the cut-off voltage Vio of the second fuse 10 is much lower than the cut-off voltage V 8 of the first fuse 8.
- the protection device 2 also includes a pyroelectric switch 12 and a control circuit 14.
- the pyroelectric switch 12 is connected in parallel to the first fuse 8 between the intermediate conductor 5 and the output conductor 6.
- the pyroelectric switch 12 has a first zone 16 and a second zone 18.
- the first zone 16 is called the control zone and is capable of receiving a trigger signal S.
- the second zone 18 is called the power zone.
- the power zone 18 is the part of the pyroelectric switch 12 electrically connected in parallel to the first fuse 8. It is configured for the passage of the electric current I which supplies the electric circuit 1.
- the zone power 18 has an electrical resistance which is much lower than that of the first fuse 8, for example at least ten times lower.
- the second fuse 10 begins to melt and an electric arc A, as visible in FIG. 2, begins to appear between its terminals.
- the part of the electric current which passes through the first fuse 8 does not have sufficient intensity to trigger the melting of the first fuse 8.
- the second fuse 10 is dimensioned and arranged to start blowing before the first fuse 8.
- the control zone 16 of the pyroelectric switch 12 includes a resistor 20 capable of heating when it is crossed by an electric current.
- the pyroelectric switch also includes an explosive agent, not shown, for example an explosive powder, and a cut-off element, such as a piston or a guillotine.
- the breaking element which is not shown, is made of electrically insulating material, for example plastic. It is capable of cutting the power zone 18.
- the resistor 20 of the control zone 16 is crossed by an electric current, the resistor 20 heats up and triggers the detonation of the explosive agent which causes the element to tip over. breaking from a first position where it is distant from the power zone 18 to a second position where it cuts the power zone 18 so as to interrupt the passage of electric current in the electric circuit 1.
- the control circuit 14 is configured to generate and transmit the trigger signal S to the control zone 16 of the pyroelectric switch 12.
- the control circuit 14 is connected between the second fuse 10 and the control zone 16.
- the trigger signal S produced by the control circuit 14 is an electric trigger current l s which is transmitted to the control zone 16.
- the trigger current l s crosses the resistor 20 and triggers the pyroelectric switch 12 .
- the control circuit 14 can comprise one or more active and / or passive electrical components for the generation and transmission of the trigger signal S.
- the control circuit 14 does not include an internal power source .
- the control circuit 14 includes a potentiometer capable of controlling the trip current l s transmitted to the pyroelectric switch 12.
- the potentiometer is configured to modulate the intensity of the electric current l s which is supplied to the control zone 16 of the pyroelectric switch 12.
- the potentiometer of the control circuit 14 is configured to control the opening speed of the pyroelectric switch 12.
- the protection device 2 is configured to be in different configurations C1, C2, C3, and C4, namely a closing configuration C1, a first intermediate configuration C2, a second intermediate configuration C3 and an opening configuration C4.
- the electric current I which supplies the electric circuit 1 is less than the nominal current l n and therefore the first and second fuses 8 and 10 are not blown.
- the electric current I which feeds the electric circuit 1 is greater than the threshold value l n .
- the second fuse 10 then begins to blow, and the electric arc A appears between its terminals.
- This electric arc A causes the appearance of an electric supply voltage V, which is then supplied to the control circuit 14.
- the cut-off voltage Vio of the second fuse 10 is chosen so that the arc electric A remains present between its terminals while it is melting, as long as current I flows.
- the pyroelectric switch 12 is triggered and the first fuse 8 is closed.
- the control circuit 14, supplied by the voltage V, builds on this voltage V and transmits the trigger signal S, in the form of the current l s , to the electrical resistance 20 of the control zone 16, by triggering l pyroelectric switch 12 which rapidly opens the power zone 18.
- the electric current I passes through the first fuse 8.
- the first and second fuses 8 and 10 are blown. Indeed, from the moment when the second intermediate configuration C3 is reached, the electric fault current causes the first fuse 8 to blow after a predetermined period of time, of the order of a few milliseconds (ms) which depends on the characteristics of the first fuse 8.
- ms milliseconds
- the breaking current l 8 of the first fuse 8 is chosen to be much lower than the value of the nominal current l n
- the first fuse 8 blows very quickly when it is crossed by current I.
- the voltage of cut-off V 8 of the first fuse being equal to the nominal value V n , the fuse blows quickly and the electric arc across its terminals does not remain established for a long time, unlike the second fuse 10.
- the control circuit 14 is represented as a “box” connected between the second fuse 10 and the control zone 16.
- the control circuit 14 is represented by an electrical resistance 140, for the reasons developed below.
- the electrical resistance 140 is subjected to the supply voltage V generated at the terminals of the second fuse 10.
- the value of the resistance 20 is less than ten times or a hundred times the value of the resistance 140. It is therefore the value of the resistor 140 which sizes the value of the current l s transmitted to the control zone 16.
- this can be represented electrically by a simple resistor 140 in an electrical diagram , as is the case in FIGS. 2 to 4.
- the electrical resistance 140 is electrically connected in series with the electrical resistance 20.
- the assembly formed by the resistance 20 and the resistance 140 is electrically connected in parallel with the second fuse.
- a method of protecting the electrical circuit 1, equipped with the protective device 2 is implemented when an electrical current I greater than the nominal current l n occurs in the electrical circuit 1 and passes through the protective device 2.
- the overcurrent is strictly greater than zero.
- the protection device 2 is in the closing configuration C1, since the electric current I supplies the electric circuit 1 and the first and second fuses 8 and 10 are not blown. The protection process is described below.
- a fault occurs in the supply of the electric circuit 1 and the electric current flows through the protection device 2. Because of the electric current, and in an interval of time predetermined by the rating of the second fuse 10, the second fuse 10 begins to melt and the electric arc A is installed across the second fuse 10. As mentioned above, the second fuse 10 is dimensioned so that the electric arc A remains present between its terminals while it is melting, as long as the current I is present, which generates the supply voltage V and ensures the passage of the current. This voltage V is used to supply the control circuit 14.
- the protection device 2 is in its first intermediate configuration C2 where the second fuse 10 is blowing and the voltage d power V is supplied to the control circuit 14.
- the control circuit 14 is a passive circuit, the supply voltage V supplied by the second fuse 10 represents the only power source of the circuit command 14 required for operation of it.
- the method comprises the melting of the second fuse 10 caused by the electric current I greater than l n and the supply of the control circuit 14.
- the method then comprises a step b) in which the control circuit 14 generates the trigger signal S, which corresponds to the electrical trigger current l s . Then, the control circuit 14 transmits this tripping current l s to the pyroelectric switch 12, in particular to the control zone 16 of the pyroelectric switch 12. Since the electric arc A is always present at the terminals of the second fuse 10, the electric fault current still crosses the power zone 18 of the pyroelectric switch 12.
- the method comprises the transmission, using the control circuit 14, of the trigger signal S at the pyroelectric switch 12.
- the method comprises a step c) which comprises the triggering of the pyroelectric switch 12 and the cutting off of the power zone 18 of the pyroelectric switch 12.
- the electric current l s passes through the electrical resistance 20 of the control zone 16 which heats up and triggers the detonation of the explosive agent of the pyroelectric switch 12.
- the detonation of the explosive agent causes the cut-off element to switch from its first position to its second position so as to cut the power zone 18 of the pyroelectric switch 12.
- the protection device 2 is in its second intermediate configuration C3 where the pyroelectric switch 12 is triggered, the power zone 18 is open and the first fuse 8 is still closed.
- the method includes a step d) in which the electric current flows through the first fuse 8, since the power zone 18 of the pyroelectric switch 12 is open.
- the first fuse 8 being undersized compared to the second fuse 10, the first fuse 8 blows quickly because of the electric current.
- the protection device 2 ensures the opening of the electric circuit 1 , since no electric arc is installs at the terminals of zone 18 of the switch 12. An electric arc can appear at the terminals of the first fuse 8 when it blows, but it goes out quickly because the cut-off voltage of this first fuse 8 is the same order of magnitude of the nominal voltage V n .
- the electrical circuit opens and the current I no longer flows. Arc A goes out in turn, and the second fuse 10 blows completely.
- the protection device 2 is then in its opening configuration C4 where the first and second fuses 8 and 10 are blown.
- the protection device 2 comprises two pyroelectric switches similar to the pyrotechnic switch 12.
- the two pyroelectric switches are connected in parallel to the first fuse 8 between the input conductor 4 and the output conductor 6.
- each pyroelectric switch includes an electrical resistance 20.
- the electrical resistances are in parallel and are thus crossed by a part of the triggering electric current l s which causes these resistances to heat up, as explained above.
- the protection device 2 comprises three or more than three pyroelectric switches connected in parallel.
- each pyroelectric switch is configured to cut off an electric fault current having an intensity of 200 amps.
- the protection device 2 is able to cut off an electric current I having a total intensity of 400 amps.
- the load 3 is electrically connected to the first conductor 4.
- the electric current 1 then flows from the second conductor 6 to the first conductor 4 in normal operating conditions.
- the device 2 also includes a diagnostic system 30 comprising at least one sensor, for example for measuring the current flowing in the pyrotechnic switch 12, in particular the current flowing in the fuse 8, and an electronic processing unit programmed to detect a failure of the protection device as a function of the measured current values.
- the diagnostic system 30 comprises a first sensor 32 for measuring the current I s which flows in the control zone 16 and a second sensor 34 for measuring the current I which flows in the power zone 18.
- the electronic processing unit is programmed to compare the current values measured by the first sensor 32 and the second sensor 34 and to detect a failure of the protection device 2 as a function of the measured current values.
- the system 30 includes a sensor 32 for measuring the current flowing in the fuse 8.
- the system 30 can in addition include a sensor 34 which measures the current flowing in the control zone 16.
- At least one sensor 34 of the diagnostic system 30 is arranged to measure the current in the fuse 8, for example by being connected in series with the fuse 8.
- the system diagnostic 30 can then include one or more additional sensors 32 which can be connected with the breaking component 12, for example with the control zone 16 as illustrated in FIGS. 3 and 6 and / or with the power zone 18 and / or with fuse 10.
- the diagnostic system 30 makes it possible to detect the appearance of a failure which may affect the proper functioning of the protection device 2, such as for example the failure of the control zone 16, a failure of the fuse 10, a failure of the associated fuse 8 to the breaking component 12, or the accidental rupture of one of the connectors.
- the value of the current Is measured by the sensor 34 is linked to the value of the current I measured by another sensor.
- these two current values I and Is are linked by a proportional relationship which is a function of the temperature of the protection device 2.
- a fault is present in the protection device 2 if the value of the current Is measured by the sensor 34 is zero while the value of the current I measured by the other sensor is not zero.
- the diagnostic system comprises a first electronic processing unit 36 which is connected to a second remote electronic processing unit 38, via a data link 40.
- the second processing unit 38 is for example configured to, upon receipt of a signal indicating a failure, trigger safety measures for circuit 1, such as for example disconnecting the electrical source supplying circuit 1 or disconnecting the electrical load 3 , for example by means of a contactor or a switch, not shown.
- the first sensor 32 and the second sensor 34 are both connected to the first processing unit 36.
- the comparison and detection of a failure are carried out by the first processing unit 36.
- the first processing unit processing 36 is also programmed to send a fault detection signal to the second processing unit 38 via the bus 40.
- the first sensor 32 is connected to the first processing unit 36.
- the second sensor 34 is connected to the second processing unit 38.
- the comparison and the detection of a failure are produced by the second processing unit 36.
- the first processing unit 36 is also programmed to transmit the current value measured by the current sensor to which it is connected to the second processing unit 38 via the bus 40.
- the sensors 32 and / or 34 are current sensors.
- the current sensors 32 and or 34 are Hall effect type sensors or inductive effect sensors or current transformers.
- the sensors 32 and / or 34 include a voltage sensor which measures the electric voltage across a resistor.
- the sensors 32 and / or 34 include a current injection device including a coil surrounding the branch of the circuit in which the current to be measured flows, the device being able to inject into the branch, by means of the coil, an electric current having a predefined shape (eg a pulse or a sinusoidal signal).
- the device comprises a second coil surrounding said branch and making it possible to measure the total current flowing in said branch, and a processing circuit makes it possible to automatically determine the value and / or signal form of the current to be measured flowing in said branch.
- the measurement of the current I by the system 30 is carried out indirectly, by measuring the electrical properties of the load 3.
- the corresponding sensor is not associated with an electrical conductor of the circuit 1 but, on the contrary , is associated with the load 3.
- the second sensor 34 is then not necessarily a current sensor.
- the processing units 36 and 38 comprise for example a dedicated electronic circuit and / or a programmable microcontroller.
- the data link 40 is a wired link, for example a field bus such as a CAN bus or a LIN bus, or even a wireless link.
- the various components of the diagnostic system 30 can be integrated in the same housing. According to examples, at least some of the components of the diagnostic system 30 can be integrated into the same electronic element, such as an integrated circuit of the AS IC type.
- the diagnostic system 30 previously described is modified so that the second sensor 34 is arranged to measure the current flowing through the first fuse 8.
- the electronic processing unit is always programmed to compare the current values measured by the first sensor 32 and the second sensor 34 and to detect a failure of the protection device 2 as a function of the measured current values, but can be based on a different calculation formula from that described. Thus, it is not necessary to measure the current flowing in the power zone 18.
- an additional sensor analogous to the second sensor 34 can be arranged to measure the current flowing through the second fuse 10. This makes it possible to determine whether the second fuse 10 is still electrically conductive and that the circuit 14 is still able to be supplied by the voltage V supplied by the second fuse 10.
- the diagnostic system comprises a single sensor 32 or 34 for measuring the current.
- the sensor 32 or 34 is arranged to measure the current flowing in the control zone 16 or, preferably, to measure the current flowing through the fuse 8.
- the electronic processing unit 36, 38 can be programmed to detect a failure of the protection device 2 on the basis of the current values measured by the single sensor 32 or 34.
- measuring the current flowing in the control zone 16 makes it possible to verify that the current zone 16 is still electrically conductive and that no abnormal interruption has occurred, since such an interruption would compromise the tripping of the switch. 12.
- measuring the current flowing in fuse 8 makes it possible to check whether this fuse is still electrically conductive.
- a diagnostic system analogous to the diagnostic system 30 can be used in the embodiments of the protection device 2 comprising several breaking components 12.
- an implementation of the protection device 2 comprises two pyroelectric switches 12A, 12B whose respective power zones 18 are connected in series with the second fuse 10 between the first conductor 4 and the second conductor 6.
- the diagnostic system 30 comprises then at least two sensors, for example analogous to sensor 32, each of the two sensors being arranged to measure the current flowing in the control zone of one of the two pyrotechnic switches.
- the electronic processing unit is programmed to compare the current values measured by the two sensors in order to detect a failure of the protection device 2. This variant can be transposed to the case where the device 2 has more than two switches pyroelectric.
- an alternative implementation of the protection device 2 comprises two pyroelectric switches 12A, 12B whose respective power zones 18 are connected in parallel to the first fuse 8 between the first conductor 4 and the second conductor 6.
- the diagnostic system 30 then comprises at least two sensors, for example analogous to sensor 32, each of the two sensors being associated with one of the two pyrotechnic switches. For example, each of said sensors is arranged to measure the current flowing in the control area of one of the two pyrotechnic switches.
- the diagnostic system 30 may include a temperature sensor, preferably installed near or in contact with the device 2.
- the unit processing electronics is programmed to correct the current measurements supplied by the or each sensor 32 and / or 34 as a function of the temperature measured.
- the different embodiments described above can be generalized to a cut-off component 12 different from a pyrotechnic switch 12, such as a power switch controllable by an actuation signal.
- the pyrotechnic switch 12 can be replaced by an electronic breaking component 12 such as a circuit breaker or a contactor.
- the power zone 18 corresponds to a cut-off zone with separable contacts
- the control zone 16 corresponds to a tripping mechanism capable of being controlled by an electric voltage to open the contacts of the power zone 18.
- the breaking component 12 comprises a power transistor, the control zone 16 then corresponding to a control electrode of the transistor, such as the gate of the transistor.
- the second fuse 10 can be omitted.
- the control circuit 14 can be omitted.
- the trip signal S of the cut-off component 12 is then generated by an external control circuit, or by the diagnostic system 30.
Landscapes
- Emergency Protection Circuit Devices (AREA)
- Protection Of Static Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1872010A FR3089052B1 (en) | 2018-11-28 | 2018-11-28 | Protection device for an electrical circuit and an electrical circuit equipped with such a device |
PCT/EP2019/082720 WO2020109375A1 (en) | 2018-11-28 | 2019-11-27 | Device for protecting an electrical circuit, and electrical circuit comprising such a device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3888111A1 true EP3888111A1 (en) | 2021-10-06 |
EP3888111B1 EP3888111B1 (en) | 2023-05-24 |
Family
ID=66530131
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19806289.5A Active EP3888111B1 (en) | 2018-11-28 | 2019-11-27 | Device for protecting an electrical circuit, and electrical circuit comprising such a device |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3888111B1 (en) |
CN (1) | CN113168980A (en) |
FR (1) | FR3089052B1 (en) |
WO (1) | WO2020109375A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN115036193A (en) * | 2022-03-22 | 2022-09-09 | 西安中熔电气股份有限公司 | High-reliability active and passive integrated protection device |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
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US4920446A (en) * | 1986-04-18 | 1990-04-24 | G & W Electric Co. | Pyrotechnically-assisted current interrupter |
EP1654793B1 (en) | 2003-08-08 | 2016-07-06 | Delphi Technologies Inc. | Circuit interruption device |
US8762083B2 (en) * | 2008-07-28 | 2014-06-24 | Littelfuse, Inc. | Intelligent fuse holder and circuit protection methods |
DE102009023801A1 (en) * | 2009-06-03 | 2010-02-04 | Daimler Ag | Safety device for disconnecting high voltage battery in e.g. electric vehicle from electric circuit during short circuit, has safety fuse connected parallel to pyrotechnical fuses, and series resistor connected upstream to safety fuse |
FR3041143B1 (en) | 2015-09-10 | 2017-10-20 | Mersen France Sb Sas | PROTECTIVE DEVICE FOR AN ELECTRICAL CIRCUIT, ELECTRIC CIRCUIT EQUIPPED WITH SUCH A DEVICE AND METHOD FOR PROTECTING SUCH AN ELECTRICAL CIRCUIT |
US10361048B2 (en) * | 2016-05-11 | 2019-07-23 | Eaton Intelligent Power Limited | Pyrotechnic circuit protection systems, modules, and methods |
DE102018207247B4 (en) * | 2017-12-15 | 2024-07-11 | Bayerische Motoren Werke Aktiengesellschaft | Disconnecting device for a high-voltage electrical system of a motor vehicle, high-voltage electrical system and motor vehicle |
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2018
- 2018-11-28 FR FR1872010A patent/FR3089052B1/en active Active
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2019
- 2019-11-27 CN CN201980076699.0A patent/CN113168980A/en active Pending
- 2019-11-27 EP EP19806289.5A patent/EP3888111B1/en active Active
- 2019-11-27 WO PCT/EP2019/082720 patent/WO2020109375A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
WO2020109375A1 (en) | 2020-06-04 |
CN113168980A (en) | 2021-07-23 |
FR3089052B1 (en) | 2020-12-11 |
EP3888111B1 (en) | 2023-05-24 |
FR3089052A1 (en) | 2020-05-29 |
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