EP3127226A1 - Voltage converter for an on-board electrical machine in a vehicle - Google Patents
Voltage converter for an on-board electrical machine in a vehicleInfo
- Publication number
- EP3127226A1 EP3127226A1 EP15720211.0A EP15720211A EP3127226A1 EP 3127226 A1 EP3127226 A1 EP 3127226A1 EP 15720211 A EP15720211 A EP 15720211A EP 3127226 A1 EP3127226 A1 EP 3127226A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- control unit
- voltage
- switches
- converter
- control
- 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.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
Definitions
- the present invention relates to a voltage converter for an electrical machine embedded in a vehicle.
- the invention relates to a DC / AC voltage converter for supplying an electric motor of an air conditioning compressor on board a vehicle.
- the invention also relates to a compressor for refrigerant fluid embedded in a vehicle.
- An air conditioning compressor is known embedded in a vehicle, especially for cooling a passenger compartment.
- the document FR2814783A1 describes an example of such a compressor comprising a mechanism for compressing a refrigerant fluid driven by a dedicated electric motor, and powered by a voltage converter.
- the compression mechanism, the electric motor and the voltage converter are in a single housing, possibly being arranged in particular housings of the housing.
- the voltage converter includes switches connected to a high voltage battery for powering the electric motor.
- the voltage converter is isolated from the rest of the vehicle, including a low voltage circuit of the vehicle.
- US6137705 discloses a voltage converter which is isolated from the low voltage circuit of the vehicle by an insulating element between the control unit of the converter and the low voltage circuit of the vehicle. This is a security isolation).
- the converter also includes an isolation between the control unit of the switches and the control unit of the converter. In this case it is a functional insulation.
- the isolation between the control unit of the switches and the control unit of the converter is achieved by the gate oxide of a field effect transistor.
- the gate oxide has a parasitic capacitance which causes currents that can be dangerous due to rapid changes in voltage.
- the gate oxide is also fragile, which leads to a risk of loss of insulation.
- the isolation voltage is limited.
- the invention relates to a voltage converter for an electrical machine embedded in a vehicle, comprising:
- control unit for supplying a control signal to said switches so as to convert the input voltage to the output voltage
- At least one control unit of said switches for adapting said control signals delivered by the control unit in order to control said switches;
- an isolating transformer having at least one primary winding and at least one at least one secondary winding, arranged between said control unit and functional elements of said control unit so as to allow signal transmission between the control unit and the control unit through a magnetic circuit.
- a galvanic isolation separates the control unit from the control unit of the switches.
- the transformer is more reliable in its electrical isolation function than the gate oxide of a field effect transistor disclosed in the prior art.
- the galvanic isolation has a parasitic capacitance between the windings which is very low. The impedance is then stronger and does not favor the passage of the current. This current could be harmful in terms of electromagnetic compatibility, or for the components themselves. The potential disturbances within the control unit are therefore reduced, this one has a better robustness.
- the control unit in the converter according to the invention has less latch-up effect.
- the transformer Thanks to the transformer, a transmission of a signal, in particular a voltage signal, between the control unit and the control unit can be ensured even if the control and control units have very different mass levels. .
- the isolation transformer allows a better immunity of the control signals. Controls and signal variations can be faster, which improves switching losses.
- the voltage converter may be a converter converting an alternating voltage into a DC voltage or vice versa, or a converter converting a DC voltage to a DC voltage.
- the converter can be used to power the electrical machine and / or to recover a voltage delivered by the electric machine.
- the switches are arranged in one or more arms, an arm comprising at least two switches in series separated by a midpoint.
- the transformer comprises a primary winding connected to the control unit and a secondary winding for each transistor of the arm.
- a single transformer can be used for all the switches of an arm, which reduces the size of the voltage converter.
- the circuit of the primary winding and the circuit of the secondary winding are connected to the same voltage mass. This has the advantage of simplifying the circuit of the converter.
- said mass is common to the mass to which one end of the arms is connected.
- this makes it possible to use a single power supply for all the drive units of the converter.
- the invention also relates to a refrigerant circuit compressor comprising a fluid compression mechanism coupled to an electric motor, said compressor further comprising a housing housing said mechanism compression, said motor, and a converter according to the invention for supplying said electric motor.
- FIG. 1 illustrates a circuit comprising a voltage converter according to the invention
- FIG. 2 illustrates an example of a switch control unit that can be used in the converter of FIG. 1;
- FIG. 3 illustrates an example of an isolation transformer that can be used in the control unit of FIG. 2.
- the circuit of FIG. 1 comprises a DC / AC or inverter voltage converter 10 which converts a DC input voltage delivered by a voltage source 12 into an AC output voltage to power an electric motor M.
- the motor M is coupled to a refrigerant compression mechanism (not shown).
- the compression mechanism, the motor M and the voltage converter 10 form a compressor for an electrically controlled refrigerant circuit.
- a compressor is for example a cabin air conditioning compressor on board a vehicle.
- the voltage converter 10 includes switches A1, A2, B1, B2, C1, C2 arranged to convert the DC input voltage to the AC output voltage.
- the switches are arranged in arms A, B, C.
- Each arm comprises two switches in series separated by a midpoint.
- the voltage converter 10 comprises three arms A, B, C to supply the motor M which is three-phase.
- Each arm has one end connected to the positive terminal of the voltage source 12 and the other end connected to the ground GND HT of the voltage source 12.
- the switches A1, A2, B1, B2, C1, C2, C3 may be field effect transistors, for example MOS or IGBT. These switches include a freewheeling diode in parallel with the transistor. This diode may in particular be intrinsic to the transistor.
- the converter 10 comprises a control unit UC which delivers a signal to the switches A1, A2, B1, B2, C1, C2, C3 to control them in closing and opening so as to convert the DC input voltage into an alternative output voltage. to control a rotation of the electric motor M.
- a controller 15 controls the converter 10 by communicating with the control unit UC.
- the control unit UP receives as input a signal delivered by the control unit UC.
- the control unit UP may comprise a signal processing unit 9 which adapts the signal delivered by the control unit UC for transmission via the isolation transformer 14.
- the processing unit 9 converts the signal into a frequency modulated signal.
- Amp amplifiers may be present at the output of the processing unit 9 to amplify the signal delivered to the isolation transformer 14.
- the control unit UP may further comprise a processing unit 11 at the output of the isolation transformer 14 to adapt the signal from the transformer 14 to the functional elements 16.
- the processing unit 11 demodulates the signal from the transformer 14.
- the isolation transformer 14 a galvanic isolation is obtained between the UP control and the control unit UC while allowing a signal transmission between the control unit UC and the control unit UP.
- the isolation transformer 14 makes it possible to drive the switches more quickly without risk of deterioration of the insulation, and to minimize the currents. of common mode responsible for this degradation.
- a gate oxide can break and cause an insulation fault, the transformer 14, being better insulated by construction, will be more robust. The transformer 14 thus provides a more robust insulation.
- the transformer 14 can support a mass shift between the control unit UC and the control unit UP.
- the transformer 14 can provide a transmission of a signal, in particular a voltage signal, between the control unit UC and the control unit UP, even if the control units UC and control unit UP have different mass levels. This can particularly happen for the control unit UP of the switch A1, B1, C1 which is situated on the top side of an arm A, B, C, that is to say a switch A1, B1, C1 which is connected to the positive terminal of the voltage source 12 by one of its terminals.
- FIG. 3 illustrates an embodiment of the isolation transformer 14.
- the isolation transformer 14 comprises a primary winding 141 and a secondary winding 142 wound on respective branches of a magnetic circuit 140 for channeling the flow.
- the primary winding 141 creates a magnetic flux that flows through the circuit 140 to induce a voltage in the secondary winding 142.
- the secondary winding 142 thus delivers a signal from the control unit UC to control functional elements dedicated to a transistor of an arm A, B, C.
- the isolation transformer 14 comprises a second secondary winding. This second secondary winding delivers the control signal to functional elements dedicated to the other transistor of the arm
- a single isolation transformer 14 can be used for the two transistors of the arm, which reduces the bulk of the voltage converter 10
- the electrical circuit 143 connected to the primary winding 141 and the electrical circuit 144 connected to the secondary winding 142 may be connected to the same voltage mass. This can in particular be the case for the switch A2, B2, C2 of an arm A,
- the mass of the electrical circuits 143, 144 connected to the primary windings 141 and secondary 142 is common to the mass GND HT at which one end of the arms A, B, C is connected.
- the converter is simplified.
- the converter is simplified in that it is not necessary to provide electrical isolation between the UC control units and their power supply.
- an insulation barrier 20 can be provided between the high voltage and low voltage circuits so as to avoid endangering a user because of the propagation of a high voltage on the low voltage circuit.
- An isolated communication element 19, such as an optocoupler, for example, may be arranged between the controller 15 and the control unit UC of the converter 10 to provide communication through the isolation barrier 20.
- An isolated power supply 17, such as a flyback converter, can be used to supply components located on the high voltage side by a voltage coming from the low voltage source 13.
- the voltage converter 10 is particularly adapted to be integrated in a compressor for refrigerant circuit embedded in a vehicle.
- the converter could have a number of three arms different from three.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1452806A FR3019406B1 (en) | 2014-03-31 | 2014-03-31 | VOLTAGE CONVERTER FOR AN ELECTRIC MACHINE BOOTED IN A VEHICLE |
PCT/FR2015/050815 WO2015150679A1 (en) | 2014-03-31 | 2015-03-30 | Voltage converter for an on-board electrical machine in a vehicle |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3127226A1 true EP3127226A1 (en) | 2017-02-08 |
Family
ID=51210542
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15720211.0A Withdrawn EP3127226A1 (en) | 2014-03-31 | 2015-03-30 | Voltage converter for an on-board electrical machine in a vehicle |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3127226A1 (en) |
JP (1) | JP6666261B2 (en) |
FR (1) | FR3019406B1 (en) |
WO (1) | WO2015150679A1 (en) |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3983321A (en) * | 1974-07-30 | 1976-09-28 | Exxon Research And Engineering Company | Switching circuit utilizing a base storage characteristics of a transistor for use in a facsimile transceiver and the like |
US4554512A (en) * | 1984-08-27 | 1985-11-19 | Aerotech, Inc. | Switching amplifier with MOSFET driver circuit |
US5596466A (en) * | 1995-01-13 | 1997-01-21 | Ixys Corporation | Intelligent, isolated half-bridge power module |
JP3625692B2 (en) | 1999-05-28 | 2005-03-02 | 三菱電機株式会社 | Automotive power converter |
JP2001267904A (en) * | 2000-03-17 | 2001-09-28 | Mitsubishi Electric Corp | High voltage switch device |
JP3976512B2 (en) | 2000-09-29 | 2007-09-19 | サンデン株式会社 | Electric compressor for refrigerant compression |
JP2007250891A (en) * | 2006-03-16 | 2007-09-27 | Fuji Electric Device Technology Co Ltd | Power electronics equipment |
US7548436B1 (en) * | 2008-06-17 | 2009-06-16 | Lite-On Technology | Driving circuit and a power converter incorporating the same |
US8816653B2 (en) * | 2008-09-25 | 2014-08-26 | Infineon Technologies Austria Ag | Circuit including a transformer for driving a semiconductor switching element |
JP5531186B2 (en) * | 2008-12-18 | 2014-06-25 | サンデン株式会社 | Drive circuit integrated electric compressor |
JP5639978B2 (en) * | 2011-09-27 | 2014-12-10 | 日立オートモティブシステムズ株式会社 | Automotive power conversion control device |
-
2014
- 2014-03-31 FR FR1452806A patent/FR3019406B1/en not_active Expired - Fee Related
-
2015
- 2015-03-30 JP JP2016559982A patent/JP6666261B2/en not_active Expired - Fee Related
- 2015-03-30 EP EP15720211.0A patent/EP3127226A1/en not_active Withdrawn
- 2015-03-30 WO PCT/FR2015/050815 patent/WO2015150679A1/en active Application Filing
Non-Patent Citations (2)
Title |
---|
None * |
See also references of WO2015150679A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP2017510238A (en) | 2017-04-06 |
JP6666261B2 (en) | 2020-03-13 |
FR3019406B1 (en) | 2017-09-01 |
FR3019406A1 (en) | 2015-10-02 |
WO2015150679A1 (en) | 2015-10-08 |
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