Method for controlling the temperature of at least one capacitor for an on-board charger.
Patent Information
- Application Number
- FR2023002986
- Authority / Receiving Office
- FR · FR
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2023-03-29
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2043-03-29
Smart Images
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Abstract
Description
Title of the invention: Method for controlling the temperature of at least one capacity for an on-board charger. Technical field
[0001] The invention relates to the field of electric vehicles and more specifically to a method for controlling the temperature of at least one capacity for an on-board charger of an electric vehicle. Prior art
[0002] An electric vehicle comprises at least one high voltage battery, for example a 600 Volt or 800 Volt battery, coupled to a high voltage electrical network (internal network of the electric vehicle) and a low voltage type battery, for example 12 Volt, coupled to a low voltage electrical network (internal network of the electric vehicle). The high voltage battery as well as the low voltage battery are adapted to deliver electrical energy and to accumulate electrical energy respectively on the low voltage electrical network and on the high voltage electrical network.
[0003] To do this, the electric vehicle includes an on-board charger, better known as OBC for "On Board Charger" in English, connected to the high-voltage battery called "BHT" via the high-voltage electrical network. The on-board charger is adapted to, once connected to a power supply network, convert the alternating voltage supplied by an external electrical network into a high-voltage direct voltage capable of recharging the high-voltage battery.
[0004] [Fig.l] represents a schematic diagram of a state-of-the-art on-board electric charger 10 adapted for charging the high-voltage battery 60 dedicated, for example, to the power supply of an electric machine for the propulsion of an electric or hybrid vehicle.
[0005] The on-board electrical charger 10 comprises an electromagnetic filtering circuit 20 which may be optional, and a power factor correction circuit 30 called “PFC” which may be bidirectional. Said power factor correction circuit 30 further comprises an AC-DC converter circuit adapted to receive, for example, an electric current from a domestic AC power supply network.
[0006] The on-board electrical charger 10 also comprises a DCLINK module 40 arranged between the power factor correction circuit 30 and a DC / DC direct-direct converter 50 adapted to charge the high voltage battery 60.
[0007] As is known to those skilled in the art, charging the low voltage power supply battery, not shown in [Fig.l], is produced by the high voltage battery 60, by a second DC-DC converter, not shown in [Fig.l] connected between the high voltage battery 60 and the low voltage power supply battery.
[0008] The charging of the high voltage battery is carried out using the on-board electric charger 10 once coupled to the electrical network 70.
[0009] The DCLINK module 40 is composed of a determined number of electrochemical capacitors whose equivalent value is relatively large to accept a relatively large effective current value when charging the battery and to reduce, or sufficiently filter the ripples of the rectified voltage at the output of the power factor correction circuit 30 so that, said ripples, once filtered, are compatible with the input characteristics of the DC / DC converter 50.
[0010] A well-known solution for those skilled in the art to implement the DCLINK 40 module is to implement a relatively large number of capacitors to obtain a large equivalent capacitance value to be able to both control ripple and accept large effective currents (or RMS currents for "Root Mean Square" in English) when charging the high-voltage battery at full power.
[0011] A disadvantage of this solution is the need to increase the surface area of the printed circuit or PCB for "Printed Circuit Board" in English to accommodate said capacities, significantly increasing the cost of the on-board charger 10.
[0012] Furthermore, the value of the effective current and more precisely the maximum value of the effective current depends on the charge level of the battery and the power of the charger. For example, an on-board charger may have a nominal power of 7KW.
[0013] Thus, depending on said maximum value of the effective current passing through said capacitors of the DCLINK module 40, the latter heat up and can sometimes reach temperatures equal to or greater than a critical capacity threshold temperature Tcritcap which is given by the manufacturer of the capacitors.
[0014] For example, the critical capacity threshold temperature Tcritcap is 85°C. Thus, in the case where, during charging of the high voltage battery by the charger, the temperature of the capacities reaches or exceeds the critical capacity threshold temperature Tcritcap then the lifetime of said capacities is reduced compared to use of said capacities at temperatures below the critical capacity threshold temperature Tcritcap.
[0015] To limit the temperature rise of the DCLINK 40 module's capacitors, it is common to use a cooling device placed, for example, on said DCLINK 40 module. The cooling device is adapted to cool the capacities through the DCLINK 40 module, but also to cool electronic components arranged on the printed circuit of the on-board charger 10. Such a solution can use air cooling. However, since the quantities of calories to be evacuated are relatively large, the cooling device can also be based on a principle of cooling by a liquid, i.e. water or glycol. Thus, it is possible to improve the elimination of calories generated by the electronic components and the capacities.
[0016] As mentioned above, the increase in the number of capacitors to mainly meet the maximum effective current value causes an increase in the occupied surface area on the printed circuit, and also causes an increase in the surface area of the cooling device, resulting in an even greater increase in the manufacturing costs of the on-board charger.
[0017] There is therefore a real need to control the surface area occupied by the capacitors of the DCLINK 40 module on the printed circuit of a charger while controlling the temperature of said capacitors of the DCLINK 40 module so as not to deteriorate the performance of the on-board charger. Statement of the invention
[0018] The invention relates to a method for controlling the temperature of at least one capacitor of a DCLINK module of an electronic device, said electronic device being adapted for charging a high-voltage battery of an electric vehicle, said device comprising a power factor correction circuit, a DC / DC converter, a cooling device comprising at least one channel adapted for the passage of a liquid, said device being adapted to cool at least one capacitor of the DCLINK module using the liquid, a first temperature sensor disposed at the level of at least one channel of the cooling device, said first temperature sensor being adapted to measure a temperature of the liquid, a second temperature sensor disposed on at least one capacitor of the DCLINK module and adapted to measure an actual temperature of said at least one capacitor,said control procedure comprising the following steps: • a first step El00) consisting of charging the high-voltage battery with a setpoint power (Pcons), for example maximum, • a second step E200) consisting of recording a first measurement representative of the actual temperature of at least one capacity of the DCLINK module using the second temperature sensor, and recording using the first temperature sensor a first measurement representative of the temperature of the liquid circulating in the cooling module, a third step E300) consisting of averaging n measurements representative of the actual temperature of at least one capacity of the DCLINK module using the second temperature sensor, and averaging n measurements representative of the temperature of the liquid circulating in the cooling module, a fifth step E500) consisting of comparing the averaged value of the measurements representative of the actual temperature of at least one capacity with a critical capacity threshold temperature and in the case where the averaged value of the measurements representative of the actual temperature of at least one capacity of the module is lower than the critical threshold temperature then the execution of a sixth step E600), otherwise the execution of a seventh step E700), the sixth step (E600) consisting of charging the high-voltage battery with a set power, for example maximum, the seventh step E700) consisting of comparing the average value of the measurements representative of the actual temperature of at least one capacity with the average value of the measurements representative of the temperature of the liquid, and in the case where the result of the comparison is negative, executing the sixth step E600), otherwise the execution of an eighth step E800), the eighth step E800) consisting of comparing the average value of the representative measurements of the temperature of the liquid with a first threshold coolant value, in the case where the result of the comparison is negative, the execution of a ninth step E900), otherwise the execution of the sixth step E600), the ninth step E900), consisting of comparing the average value of the measurements representative of the actual temperature of at least one capacity with the average value of the measurements representative of the temperature of the liquid, and in the case where the result of the comparison is lower than a first temperature delta value then executing a tenth step E1000); in the case where the result of the comparison is higher than the first temperature delta value then executing an eleventh step E1 100), the tenth step E1000) consisting of reducing the set power by a value of n% before moving on to the second step E200), the eleventh step E1 100) consisting, in the case where the result of the comparison is less than a second temperature delta value, of moving to a twelfth step E1200); otherwise moving to a thirteenth step E1300), the twelfth step E1200), consisting of reducing the setpoint power by m% before moving to the second step E200), the thirteenth step El300) consisting of cutting off the charge of the high battery tension.
[0019] Thus, it is possible to control the temperature of the DCLINK module capacitors.
[0020] Alternatively, the maximum setpoint power is the nominal power of the electronic device.
[0021] To optimize the risk of exceeding the threshold temperature, it is proposed that the critical capacity threshold temperature is equal to 60°C.
[0022] It is also proposed in an exemplary embodiment that the first threshold coolant value is equal to 50°C.
[0023] For example, the first temperature delta value is equal to 15°C.
[0024] Advantageously, the value of n% of the reduction in the setpoint power is equal to 20%.
[0025] Very advantageously, the value of m% of the reduction in the setpoint power is equal to 50%.
[0026] For example, the second temperature delta value is equal to 20°C. Brief description of the drawings
[0027] Other characteristics and advantages of the invention will become apparent from reading the description which follows. This is purely illustrative and must be read in conjunction with the appended drawings in which:
[0028] [Fig.l] [Fig.l] is a functional illustration of a prior art charger,
[0029] [Fig.2] [Fig.2] shows a structural diagram of the charger according to the invention,
[0030] [Fig.3] [Fig.3] is an illustration of the method according to the invention,
[0031] [Fig.4] [Fig.4] is an illustration of the method according to the invention in a variant of realization,
[0032] [Fig.5] [Fig.5] is an illustration of the method according to the invention in another variant. Description of the embodiments
[0033] The invention will be presented in the case of an implementation in an electric vehicle comprising at least one electric machine capable of converting electrical energy into mechanical energy in order to drive at least one wheel of the electric vehicle in rotation.
[0034] With reference to [Fig.2], a block diagram of an on-board electrical charger 100 according to the invention is shown. Said on-board electrical charger 100 is adapted to charge the high-voltage battery 600 dedicated, for example, to the power supply of a direct current machine for the propulsion of an electric or hybrid vehicle.
[0035] The on-board electric charger 100 can be unidirectional or bidirectional.
[0036] The latter includes an electromagnetic filtering circuit 200 which can be optional and a power factor correction circuit 300 called “PFC” which can be bidirectional, said power factor correction circuit 300 comprising an AC-DC converter circuit adapted to receive an electric current from a domestic AC power supply network for example.
[0037] A DCLINK 400 module disposed between the power factor correction circuit 300 and a DC / DC 500 DC-DC converter adapted to charge the high voltage battery 600.
[0038] As those skilled in the art know, the charging of the low voltage supply battery, not shown in [Fig.2], is carried out by the high voltage battery 600, by a second DC-DC converter, not shown, connected between the high voltage battery 600 and the low voltage supply battery.
[0039] The high-voltage battery is charged using the on-board electric charger 100 once connected to the electrical network.
[0040] Cleverly, the DCLINK 400 module is composed of a determined number of capacitors, for example electrochemical capacitors, adapted to accept a relatively high effective current value during battery charging and to sufficiently filter the ripples of the rectified voltage at the output of the power factor correction circuit 300 so that said ripples, once filtered, are compatible with the input characteristics of the DC / DC 500 DC-DC converter. Cleverly, the device of the invention proposes to control an actual temperature of at least one capacitor called Trelcap.
[0041] The on-board charger 100 cleverly comprises a cooling device 800 arranged for example on the DCLINK module 400 but also on the power factor correction circuit 300 and on the DC / DC converter 500. The cooling device 800 comprises for example at least one pipe adapted to allow a liquid to circulate. The liquid is adapted to absorb calories originating from the heating of the electronic components of the power factor correction circuit 300 and the DC / DC converter 500 but also adapted to absorb the calories generated by the capacities of the DCLINK module 400. The mechanical fixing and the thermal coupling between the different elements are obvious to those skilled in the art.
[0042] Advantageously, a first temperature sensor 900 at the level of the pipe of the cooling device 800 allows measurements of the temperature of the coolant Tliq. In a variant, the temperature of the liquid is given by measuring means arranged on the cooling circuit of the electric vehicle.
[0043] Advantageously, a second temperature sensor 910 is arranged on at least one capacitor of the DCLINK module 400. As a variant, the second temperature sensor 910 is arranged on a packaging of the DCLINK 400 module. The second temperature sensor 910 is adapted to measure the actual Trelcap temperature of at least one capacity representative of the temperature of all the capacities of the DCLINK 400 module. Thus, thanks to the device of the invention, it is possible to know the temperature in real time of the DCLINK 400 module and depending on this to activate or not the on-board charger 100.
[0044] The first temperature sensor 900 and the second temperature sensor 910 may use thermistor technology or alternatively semiconductor technology.
[0045] The invention also proposes a method for controlling the temperature of at least one capacity of the DCLINK 400 module of the on-board charger 100.
[0046] To this end, the method of the invention comprises, in its first embodiment as illustrated in [Fig. 3], a first step 11) during which the actual temperature of at least one capacitor of the DCLINK 400 module is recorded. To this end, a first representative measurement of the actual temperature of at least one capacitor of the DCLINK 400 module, for example MTrelcap_l, is taken using the second temperature sensor 910. Alternatively, said MTrelcap_l value is stored in a memory of a suitable electronic circuit.
[0047] During a second step E2), the number of measurements representative of the actual temperature of at least one capacitance of the DCLINK 400 module named MTrelcap_X is compared to a value of a first measurement counter of PCM1_Z. For example, if the value PCM1_Z is equal to 10, in other words the value Z of PCM1 is equal to 10, then the first step E1) will be carried out ten times before moving on to a third step E3).
[0048] During the third step E3) the method performs an average of all the values of the measurements representative of the real temperature of at least one capacitance of the DCLINK 400 module. Such a function is known to those skilled in the art. Thus, for example, in the case where there are ten measurements representative of the real temperature of at least one capacitance of the DCLINK 400 module, the method performs the sum of the 10 measurements which it divides by said value. The averaged value is named MTrelcap_M.
[0049] The method consists of a fourth step E4) during which the method provides for comparing the averaged value of the real measurements representative of the temperature of at least one capacitance of the DCLINK 400 module MTrelcap_M with a critical threshold temperature of capacitance Tcritcap. For example, the value Tcritcap is deduced from a curve delivered by the manufacturer of the capacitance of the DCLINK 400 module representative of the lifetime of said capacitance as a function of the operating temperature. For example, the critical threshold temperature Tcritcap is equal to 85°C.
[0050] The method provides during this fourth step E4), in the case where the value average of the measurements representative of the actual temperature of at least one capacity of the DCLINK 400 MTrelcap_M module is lower than the critical threshold temperature Tcritcap to move to a fifth step E5), otherwise the method provides for moving to a sixth step E6).
[0051] During the fifth step E5), the method proposes activating the on-board charger 100 in order to charge the high-voltage battery 600. Alternatively, the on-board charger 100 is activated and used at full power to recharge the high-voltage battery 600. The method then proposes moving on to the first step E1).
[0052] During the sixth step E6), the method proposes, as a reminder we are here in the case where the average value of the measurements representative of the real temperature of at least one capacitor of the DCLINK 400 MTrelcap_M module is greater than the critical threshold temperature Tcritcap, to deactivate the on-board charger 100 in order to stop the charging of the high-voltage battery 600 to allow the capacitors to return to temperature. The method subsequently proposes to move on again to step El).
[0053] Cleverly, the method of the invention makes it possible to charge the high-voltage battery 600 via the on-board charger 100 by controlling the actual temperature of the DCLINK 400 module. Thus, the method of the invention makes it possible to prevent the DCLINK 400 module's capacity from exceeding the critical temperature threshold Tcritcap. This allows for control of the DCLINK 400 module's capacity lifespan and, more specifically, prevents a reduction in the lifespan or operating time of the on-board charger 100.
[0054] Alternatively, the method proposes to also measure the temperature of the coolant using the first temperature sensor 900.
[0055] To do this, the method of the invention comprises, in a second exemplary embodiment as illustrated in [Fig. 4], a first step E10) during which the actual temperature of at least one capacitor of the DCLINK module 400 is recorded. To do this, a first measurement representative of the actual temperature of at least one capacitor of the DCLINK module 400, named for example MTrelcap_l, is recorded using the second temperature sensor 910. Alternatively, said value MTrelcap_l is stored in a memory of a suitable electronic circuit. A first measurement representative of the temperature of the liquid circulating in the cooling module 800, named for example MTL_1, is also recorded using the first temperature sensor 900. Alternatively, said value MTL_1 is stored in a memory of a suitable electronic circuit.
[0056] During a second step E20) the number of measurements representative of the actual temperature of at least one capacitance of the DCLINK 400 module named MTrelcap_X is compared to a value of a first measurement counter PCM1_Z. For example, if the value PCM1_Z is equal to 10, in other words the value Z of PCM1 is equal to 10, then the first step E10) will be carried out ten times before moving on to a third step E30).
[0057] During the third step E30), the method performs an average of all the values of the measurements representative of the actual temperature of at least one capacity of the DCLINK module 400. Such a function is known to those skilled in the art. Thus, for example, in the case where there are ten measurements representative of the temperature of at least one capacity of the DCLINK module 400, the method performs the sum of the ten measurements which it divides by said value. The averaged value is named MTrelcap_M. The method proposes during this third step E30) to perform the same action on all the measurements representative of the temperature of the liquid circulating in the cooling module 800. The average value is named for example MTL_M.
[0058] The method then consists of executing a fourth step E40) during which the method provides for comparing the averaged value of the measurements representative of the actual temperature of at least one capacitance of the DCLINK 400 MTrelcap_M module with a critical capacitance threshold temperature Tcritcap. For example, the value Tcritcap is deduced from a curve delivered by the manufacturer of the capacitance of the DCLINK 400 module representative of the lifetime of said capacitance as a function of the operating temperature (example of curve in [Fig.2]). For example, the critical threshold temperature Tcritcap is equal to 85°C.
[0059] The method provides during this fourth step E40), in the case where the average value of the measurements representative of the real temperature of at least one capacity of the DCLINK 400 MTrelcap_M module is lower than the critical threshold temperature Tcritcap to move to a fifth step E50), otherwise the method provides for moving to a sixth step E6).
[0060] During the fifth step E50), the method proposes activating the on-board charger 100 in order to charge the high-voltage battery 600. Alternatively, the on-board charger 100 is activated and used at full power to recharge the high-voltage battery 600. The method then proposes moving on to the first step E10).
[0061] During the sixth step E60) the method proposes, as a reminder we are here in the case where the average value of the measurements representative of the real temperature of at least one capacity of the DCLINK 400 MTrelcap_M module is greater than the critical threshold temperature Tcritcap, to deactivate the on-board charger 100 in order to stop the charging of the high voltage battery 600 to allow the capacities to return to temperature. The method subsequently proposes to move on to a seventh step E70.
[0062] In the seventh step (E70), the process compares the average value MTL_M of representative measurements of the temperature of the liquid circulating in the cooling module 800 to a threshold coolant value Tliqseuil. For example, the Tliqseuil value is equal to 60°C. Alternatively, the Tliqseuil value may be equal to 40°C. The process proposes to move on to the first step E10) only when the temperature of the coolant is lower than Tliqseuil otherwise the process proposes moving on to an eighth step E80).
[0063] During the eighth step E80, the method provides, using the first temperature sensor 900, to again carry out a first measurement representative of the temperature of the liquid circulating in the cooling module 800 MTL_1. Alternatively, said value MTL_1 is stored in a memory of a suitable electronic circuit. The method then proposes moving to a ninth step E90.
[0064] During the ninth step E90), the number of measurements representative of the temperature of the liquid circulating in the cooling module 800 named MTL_ is compared to a value of a second measurement counter PCM2_Z. For example, if the value PCM2_Z is equal to 10, in other words the value Z of PCM2 is equal to 10, then the ninth step E90) will be carried out ten times before moving on to the seventh step E70).
[0065] Thanks to the method of the invention, it is possible to monitor the temperature of the capacitors and, above all, to avoid restarting the charging of the battery by the on-board charger if the temperature of the capacitors of the DCLINK 400 module is higher than the critical threshold temperature Tcritcap and the temperature of the coolant Tliq is higher than a threshold temperature representative of a poor capacity to evacuate calories by the coolant.
[0066] In another variant embodiment, it is proposed to control and limit the charging power and therefore also the setpoint power of the charger when charging the high voltage battery 600 to limit and control the rise in temperature of the capacities of the DCLINK module 400.
[0067] In simplified terms, the power delivered by the charger 100 when charging the high-voltage battery 600 can be characterized by the power delivered (from the charger) which is equal to the voltage at the terminals of the high-voltage battery 600 multiplied by the current. Said current is the constant setpoint current delivered by the charger 100 to charge the high-voltage battery 600.
[0068] For example, in the case of a 7kW charger, when the high voltage battery 600 is discharged, the voltage across the terminals of said battery is of the order of 600 Volts (for a battery having a nominal voltage of 800 Volts). Thus, the setpoint current or charging current (which is constant as a reminder) is determined by the charger 100. In this case, if the maximum setpoint charging current is set at 10 Amps, the power delivered by the charger corresponds to the maximum setpoint charging current, i.e. 10 Amps, multiplied by the voltage across the terminals of the high voltage battery 600, i.e. 600 Volts and therefore 6kW. In this example, the charger 100 has not reached its limit and therefore the high voltage battery 600 will be charged with a current of maximum charge setting of 10 amps.
[0069] As the battery 600 charges, the voltage at its terminals increases to reach, once fully charged, a voltage of the order of the nominal voltage, i.e. 800 Volts. In this case, with a set current of 10 amps, the charger 100 will not be able to deliver the necessary 8kW. The current will be reduced so as to reach the maximum power limit deliverable by the charger 100, i.e. 7kW.
[0070] The invention cleverly proposes also using the regulation of the setpoint power and therefore of the setpoint current of the charger 100 to limit the rise in temperature of the capacities of the DCLINK 400 module.
[0071] To do this, the method in another clever variant embodiment is shown [Fig.5] and comprises, in the case where the electric vehicle is coupled to an external voltage outlet and recharging of the high-voltage battery 600 is necessary, a first step E100) consisting of charging the high-voltage battery 600 by the charger 100 with a maximum setpoint power Pcons. In the remainder of the description, the term "setpoint power Pcons" means that the setpoint current delivered by the charger 100 is at the maximum in order to reach the maximum power of the charger 100 as a function of the voltage at the terminals of the high-voltage battery 600.
[0072] A second step E200) is then carried out during which the actual temperature of at least one capacitor of the DCLINK module 400 is recorded. To do this, a first measurement representative of the actual temperature of at least one capacitor of the DCLINK module 400, named for example MTrelcap_1, is recorded using the second temperature sensor 910. Alternatively, said value MTrelcap_1 is stored in a memory of a suitable electronic circuit. A first measurement representative of the temperature of the liquid circulating in the cooling module 800, named for example MTL_1, is also recorded using the first temperature sensor 900. Alternatively, said value MTL_1 is stored in a memory of a suitable electronic circuit.
[0073] During a third step E300), the number of measurements representative of the actual temperature of at least one capacitance of the DCLINK 400 module named MTrelcap_X is compared to a value of a first measurement counter PCM1_Z. For example, if the value PCM1_Z is equal to 10, in other words the value Z of PCM1 is equal to 10, then the first step E100) will be carried out ten times before moving on to a fourth step E400).
[0074] During the fourth step E400,) the method performs an average of all the values of the measurements representative of the real temperature of at least one capacitance of the DCLINK module 400. The averaged value is named MTrelcap_M. The method proposes during this fourth step E400) to carry out the same action on all the measurements representative of the temperature of the liquid circulating in the cooling module 800. The average value is named for example MTL_M.
[0075] The method then consists of executing a fifth step E500) during which the method plans to compare the averaged value of the measurements representative of the actual temperature of at least one capacitance of the DCLINK 400 MTrelcap_M module with a critical threshold temperature of capacitance Tcritcap. For example, the value Tcritcap is deduced from a curve delivered by the manufacturer of the capacitance of the DCLINK 400 module representative of the lifetime of said capacitance as a function of the operating temperature. For example, the critical threshold temperature Tcritcap is equal to 60°C. In the case where the averaged value of the measurements representative of the actual temperature of at least one capacitance of the DCLINK 400 MTC_M module is lower than the critical threshold temperature Tcritcap (60°C), the method proposes to move on to a sixth step E600), otherwise the method plans to move on to a seventh step E700).
[0076] During the sixth step (E600), the set power of the charger 100 for charging the high-voltage battery 600 is at its maximum, allowing for rapid charging of the high-voltage battery 600. The process then proposes proceeding to the second step (E200).
[0077] In the seventh step (E700), the process compares the average value of representative measurements of the actual temperature of at least one capacitor of the DCLINK 400 module, MTC_M, to the average value of representative measurements of the temperature of the liquid circulating in the cooling module 800, MTL_M. The process proposes, if the result of the comparison is negative, to proceed to the sixth step (E600), and if the result is positive, to proceed to an eighth step (E800).
[0078] During the eighth step E800), it is proposed to compare the average value MTL_M of the measurements representative of the temperature of the liquid circulating in the cooling module 800 with a first threshold coolant value Tliqseuill. For example, the value Tliqseuill is equal to 50°C. In the case where the average value MTL_M is lower than the first threshold coolant value Tliqseuill, the method proceeds to a ninth step E900). In the case where the average value MTL_M is lower than the first threshold coolant value Tliqseuill, the method proceeds to the sixth step E600).
[0079] During the ninth step (E900), it is proposed to compare the average value of all the representative measurements of the actual temperature of at least one capacitor of the DCLINK 400 module, MTrelcap_M, with the average value of the representative measurements of the temperature of the liquid circulating in the cooling module. 800, MTL_M. In the case where the result of the comparison, or subtraction, is less than a first delta temperature value PVDT1 then the process provides for the transition to a tenth step E1000); in the case where the result of the comparison, or subtraction, is greater than the first delta temperature value PVDT1, then the process provides for the transition to an eleventh step El 100).
[0080] For example, the value of the first delta temperature value PVDT1 is 15°C.
[0081] During the tenth step E1000), the method provides for a reduction in the charging setpoint current for a reduction in the charger setpoint power of 20%. The method then proposes moving to the second step E200).
[0082] During the eleventh step E1 100), the method provides that, in the case where the result of the comparison, or subtraction, is less than a second delta temperature value PVDT2, then the method provides for moving to a twelfth step E1200); in the case where the result of the comparison, or subtraction, is greater than the second delta temperature value PVDT2 then the method provides for moving to a thirteenth step E1300).
[0083] For example, the value of the second temperature delta value PVDT2 is 20°C.
[0084] During the twelfth step E1200), the method provides for a reduction in the charging setpoint current for a reduction in the charger setpoint power of 50%. The method then proposes moving to the second step E200).
[0085] During the thirteenth step E1300), the method provides for a complete cut-off of the charging setpoint current, in other words the charging is stopped. The method then proposes moving to the second step E200). The values given for the power reduction are given as an example.
[0086] Thanks to the invention and its method detailed above, it is possible to control the temperature of the DCLINK 400 module's capacitors to prevent them from exceeding the critical threshold temperature (Tcritcap) and thus preserving their lifespan, by controlling the power injected during battery charging. Furthermore, thanks to the invention, it is possible to continue charging the battery with reduced power while preventing the DCLINK 400 module's temperature from exceeding the critical capacity threshold temperature, thereby enabling high-voltage battery charging while preserving the capacitors' lifespan.
Claims
Claims
1. Method for controlling the temperature of at least one capacitor of a DCLINK module (400) of an electronic device (100), said electronic device (100) being adapted to charge a high voltage battery (600) of an electric vehicle, said device comprising a power factor correction circuit (300), a DC / DC DC converter (500), a cooling device (700) comprising at least one pipe adapted for the passage of a liquid, said device (700) being adapted to cool the at least one capacitor of the DCLINK module (400) using the liquid, a first temperature sensor (900) arranged at the at least one pipe of the cooling device (700), said first temperature sensor (900) being adapted to measure a temperature of the liquid,a second temperature sensor (910) arranged on at least one capacity of the DCLINK module (400) and adapted to measure an actual temperature of said at least one capacity, said control method comprising the following steps:, • a first step El00) consisting of charging the high voltage battery (600) with a set power (Pcons), for example maximum, • a second step E200) consisting of recording a first measurement (MTrelcap_l) representative of the actual temperature of at least one capacity of the DCLINK module (400) using the second temperature sensor (910), and recording using the first temperature sensor (900) a first measurement representative of the temperature of the liquid (MTL_1) circulating in the cooling module (700), • a third step E300) consisting of averaging n measurements representative of the actual temperature of at least one capacity of the DCLINK module (400) using the second temperature sensor (910) (MTrelcap_M), and averaging n measurements representative of the temperature of the liquid (MTL_M) circulating in the cooling module (700), • a fifth step E500) consisting of comparing the averaged value of the measurements representative of the actual temperature of at least one capacity (MTrelcap_M) with a critical capacity threshold temperature (Tcritcap) and in the case where the value average of the measurements representative of the actual temperature of at least one capacity of the module (MTrelcap_M) is lower than the critical threshold temperature (Tcritcap) then the execution of a sixth step E600), otherwise the execution of a seventh step E700), the sixth step E600) consisting of charging the high voltage battery (600) with a set power (Pcons), for example maximum, the seventh step E700) consisting of comparing the average value of the measurements representative of the actual temperature of at least one capacity (MTrelcap_M) with the average value of the measurements representative of the liquid temperature (MTL_M), and in the case where the result of the comparison is negative, execute the sixth step E600), otherwise the execution of an eighth step E800), the eighth step E800) consisting of comparing the average value (MTL_M) of the measurements representative of the liquid temperature with a first threshold coolant value (Tliqseuill),in the case where the result of the comparison is negative, the execution of a ninth step E900), otherwise the execution of the sixth step E600), the ninth step E900), consisting of comparing the average value of the measurements representative of the real temperature of at least one capacity (MTrelcap_M) with the average value of the measurements representative of the temperature of the liquid (MTL_M), and in the case where the result of the comparison is lower than a first temperature delta value (PVDT1) then executing a tenth step E1000); in the case where the result of the comparison is higher than the first temperature delta value (PVDT1) then executing an eleventh step E1100), the tenth step E1000) consisting of reducing the setpoint power (Pcons) by a value of n% before moving on to the second step E200), the eleventh step E1 100) consisting, in the case where the result of the comparison is less than a second temperature delta value (PVDT2), in moving to a twelfth step E1200); otherwise in moving to a thirteenth step E1300), • the twelfth step E1200), consisting of reducing the set power by m% before moving on to the second step E200), • the thirteenth step El300) consisting of cutting off the charge of the high voltage battery (600).
2. Method for controlling the temperature of at least one capacity of a DCLINK module (400) of an electronic device (100) according to claim 1 in which the maximum setpoint power (Pcons) is the nominal power of the electronic device (100).
3. Method for controlling the temperature of at least one capacitance of a DCLINK module (400) of an electronic device (100) according to claim 1 or 2 in which the critical capacitance threshold temperature (Tcritcap) is equal to 60°C.
4. Method for controlling the temperature of at least one capacity of a DCLINK module (400) of an electronic device (100) according to any one of claims 1 to 3 wherein the first threshold coolant value (Tliqseuill) is equal to 50°C.
5. Method for controlling the temperature of at least one capacitor of a DCLINK module (400) of an electronic device (100) according to any one of claims 1 to 4 in which the first temperature delta value (PVDT1) is equal to 15°C.
6. Method for controlling the temperature of at least one capacitor of a DCLINK module (400) of an electronic device (100) according to any one of claims 1 to 5 in which the value of n% of the reduction in the setpoint power (Pcons) is equal to 20%.
7. Method for controlling the temperature of at least one capacitor of a DCLINK module (400) of an electronic device (100) according to any one of claims 1 to 6 in which the value of m% of the reduction in the setpoint power (Pcons) is equal to 50%.
8. Method for controlling the temperature of at least one capacitor of a DCLINK module (400) of an electronic device (100) according to any one of claims 1 to 7 wherein the second temperature delta value PVDT2 is equal to 20°C.