WO2023117800A1 - A safety power switching device, a voltage converter and an electrified vehicle - Google Patents

A safety power switching device, a voltage converter and an electrified vehicle Download PDF

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Publication number
WO2023117800A1
WO2023117800A1 PCT/EP2022/086472 EP2022086472W WO2023117800A1 WO 2023117800 A1 WO2023117800 A1 WO 2023117800A1 EP 2022086472 W EP2022086472 W EP 2022086472W WO 2023117800 A1 WO2023117800 A1 WO 2023117800A1
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WO
WIPO (PCT)
Prior art keywords
power switching
power conversion
safety power
voltage converter
safety
Prior art date
Application number
PCT/EP2022/086472
Other languages
French (fr)
Inventor
Jianping Li
Emmanuel Talon
Original Assignee
Valeo Systemes De Controle Moteur
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Valeo Systemes De Controle Moteur filed Critical Valeo Systemes De Controle Moteur
Publication of WO2023117800A1 publication Critical patent/WO2023117800A1/en

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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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
    • B60L53/22—Constructional details or arrangements of charging converters specially adapted for charging electric vehicles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2210/00—Converter types
    • B60L2210/10—DC to DC converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter

Definitions

  • Embodiments of the present disclosure generally relate to a pre-charging apparatus, a voltage converter and an electrified vehicle.
  • the first network is a low-voltage network supplying less than 30 volts (V), for example, 24V, 14V or 12V
  • the second network is a high-voltage network supplying more than 30 V, for example, 48V or 60V.
  • the operation of performing voltage conversion specifically comprises connecting the high-voltage side of the DC/DC converter to an iBSG (integrated belt starter generator) in the vehicle, and connecting it to, for example, a 48V or 60V battery via a relay.
  • iBSG integrated belt starter generator
  • a capacitor at the high-voltage side needs to be charged to a battery voltage of, for example, 48V or 60V by means of a pre-charging mechanism of the DC/DC converter; the electric vehicle then connects the closed relay to the high-voltage side to, for example, a 48V or 60V battery, the battery then supplies power to the iBSG, the iBSG operates in the starter mode, then the iBSG operates in the generator mode, driven by the internal combustion engine, and the electric vehicle commands the DC/DC converter to run in a buck mode to realise power supply switching.
  • a voltage converter for an electrified vehicle comprises a power conversion device comprising at least two power conversion components connected in parallel; the voltage converter further comprises a safety power switching device, connected to the power conversion device, comprising at least two safety power switching components and configured for providing a protection mechanism for the power conversion device in the turning-off or turning-on selection process thereof.
  • each of the at least two safety power switching components is corresponding to the at least two power conversion components, and a series connection is formed between each safety power switching component and the corresponding power conversion component, so that each of the safety power switching components provides a protection mechanism for each of the power conversion components respectively.
  • each of the safety power switching components comprises at least two electric switches, used for providing a protection mechanism for the power conversion device in a boost mode and a buck mode, respectively.
  • the two series-connected electric switches of each of the safety power switching components are two reverse-connected electric switches so as to operate in the boost mode and the buck mode, respectively.
  • the voltage converter is a DC/DC converter.
  • the present disclosure provides a safety power switching device.
  • the safety power switching device is connected to a power conversion device of a voltage converter and comprises at least two safety power switch components in parallel, configured for providing a protection mechanism for the power conversion device comprising at least two power conversion components in the turning-off or turning-on selection process thereof.
  • the present disclosure provides an electrified vehicle, comprising the voltage converter or the safety power switching device as described above.
  • Figure 1 is a schematic circuit diagram of a voltage converter according to an exemplary embodiment of the present disclosure.
  • Figure 2 is a schematic circuit diagram of a voltage converter according to another exemplary embodiment of the present disclosure.
  • connection or “connected” and similar terms are not limited to a physical or mechanical connection, and may include an electrical connection, whether direct or indirect.
  • the term “real-time” means that the times when associated events occur, the times when predetermined data is measured and collected, and the data processing times and systems correspond to at least one of the event and environment times. In the embodiments described herein, these times essentially occur instantaneously.
  • FIGS. 1 and 2 are respectively schematic circuit diagrams of DC/DC converters of exemplary embodiments of the present disclosure.
  • the DC/DC converter 100 may be implemented in an electrified vehicle equipped with a dual-voltage power supply network.
  • a first on-board network may comprise a low-voltage source 4 of, for example, 12V and a second on-board network may comprise a high-voltage source 3 of for example, 48V.
  • the low-voltage source 4 and high-voltage source 3 have the same electrical ground as a reference, and the DC/DC converter 100 is connected between the low-voltage source 4 and high-voltage source 3.
  • the DC/DC converter 100 can operate in a first pre-charging stage and a second pre-charging stage, thereby realizing pre-charging of predetermined voltage values.
  • a high-voltage side voltage value When the DC/DC converter 100 operates in the first pre-charging stage, a high-voltage side voltage value will be from 0V to be a first predetermined voltage value, e.g., a 12V battery voltage.
  • the high-voltage side voltage value When the DC/DC converter 100 operates in the second pre-charging stage, the high-voltage side voltage value will be from the first predetermined voltage value to be a second predetermined voltage value, e.g., from 12V to a 48V battery voltage.
  • the DC/DC converter 100 comprises a power conversion device 120 which may comprise a plurality of power conversion devices 2 connected in parallel.
  • the power conversion device 120 comprises three power conversion devices 2.
  • the DC/DC converter 100 further comprises a safety power switching device 110, the safety power switching device 110 comprising multiple safety power switching components 1, for providing a protection mechanism for the DC/DC converter 100 in the turning- off or turning-on selection process thereof.
  • the safety power switching device 110 comprises three safety power switching components 1.
  • the safety power switching components 1 are in one-to-one correspondence with the power conversion components 2, and a series connection is formed between each safety power switching component 1 and power conversion component 2 in one-to-one correspondence with each other.
  • Each safety power switching component 1 comprises two power switches 11, 12 connected reversely and in series to operate in a boost mode and a buck mode, respectively and is thereby used for providing a protection mechanism for the power conversion device 120 in the boost mode and buck mode, respectively.
  • the power switches 11, 12 include but are not limited to the MOSFET, insulated gate bipolar transistor (IGBT), integrated gate commutated thyristor (IGCT), injection enhanced gate transistor (IEGT), silicon carbide metal oxide semiconductor field effect transistor (SiC MOSFET), or other controllable electric switches capable of switching in ON and OFF states.
  • the power switches 11 and 12 may be two common-source MOSFETs.
  • each power conversion component 2 and the corresponding safety power switching component 1 are independent power stages connected in series.
  • the power switches 11 and 12 of the corresponding safety power switching component 1 will be controlled to close this individual power transfer path, while the other two independent power stages can still work normally and output two thirds of the power.
  • the DC/DC converter 100 can maintain one third of the output power, and rely on the normal operation of only one power stage.
  • the signal to control the OFF and ON of the power switches 11 and 12 may come from a controller, which may be any type of programmable device, such as a microcontroller, a micro control unit (MCU), a digital signal processor (DSP), etc.
  • a controller which may be any type of programmable device, such as a microcontroller, a micro control unit (MCU), a digital signal processor (DSP), etc.
  • FIG 2 is a schematic circuit diagram of a voltage converter comprising more than three independent power stages connected in series.
  • the power conversion apparatus 120 of the voltage converter 200 comprises more than three power conversion components 2 connected in parallel, and each of the power conversion components 2 is connected to a corresponding safety power switching component 1 of the safety power switching device 110 in series.
  • each of the power conversion components 2 is connected to a corresponding safety power switching component 1 of the safety power switching device 110 in series.
  • This specification discloses the present disclosure by using embodiments, including preferred embodiments, and also enables those skilled in the art to implement the present disclosure, including making and using any apparatus or system and performing any incorporated method.

Abstract

The present disclosure refers to a voltage converter for electric vehicles. The voltage converter comprises a power conversion device comprising at least two power conversion components connected in parallel; the voltage converter further comprises a safety power switching device, connected to the power conversion device, comprising at least two safety power switching components and configured for providing a protection mechanism for the power conversion device in a turning-off or turning-on selection process thereof. The present disclosure also refers to a safety power switching device and an electrified vehicle.

Description

A SAFETY POWER SWITCHING DEVICE, A VOLTAGE CONVERTER AND AN
ELECTRIFIED VEHICLE
TECHNICAL FIELD
Embodiments of the present disclosure generally relate to a pre-charging apparatus, a voltage converter and an electrified vehicle.
BACKGROUND OF THE INVENTION
As drive control technology develops, it is playing an ever more important role in fields such as motor control, electric vehicle control and frequency conversion control. In the field of electrified vehicles, which include, for example, the pure battery electric vehicle (BEV), hybrid electric vehicle (HEV), plug-in hybrid electric vehicle (PHEV), range extended electric vehicle (range extended EV), fuel cell electric vehicle (FCEV), etc., there is already technology which uses a DC/DC (direct current to direct current) converter in a dual-power-supply network vehicle architecture to perform voltage conversion between a first network and a second network of a vehicle. Generally, the first network is a low-voltage network supplying less than 30 volts (V), for example, 24V, 14V or 12V, while the second network is a high-voltage network supplying more than 30 V, for example, 48V or 60V. The operation of performing voltage conversion specifically comprises connecting the high-voltage side of the DC/DC converter to an iBSG (integrated belt starter generator) in the vehicle, and connecting it to, for example, a 48V or 60V battery via a relay. A capacitor at the high-voltage side needs to be charged to a battery voltage of, for example, 48V or 60V by means of a pre-charging mechanism of the DC/DC converter; the electric vehicle then connects the closed relay to the high-voltage side to, for example, a 48V or 60V battery, the battery then supplies power to the iBSG, the iBSG operates in the starter mode, then the iBSG operates in the generator mode, driven by the internal combustion engine, and the electric vehicle commands the DC/DC converter to run in a buck mode to realise power supply switching.
Therefore, it would be desirable if any improvements on safety power switch apparatus of voltage converters for electric vehicles to deliver, at the very least, high efficiency, high safety and a simple structure.
SUMMARY OF THE INVENTION Aspects and advantages of the invention will be set forth in part in the following description, or may be obvious from the description, or may be learned through practice of the invention.
In accordance with one aspect disclosed herein, a voltage converter for an electrified vehicle is provided. The voltage converter comprises a power conversion device comprising at least two power conversion components connected in parallel; the voltage converter further comprises a safety power switching device, connected to the power conversion device, comprising at least two safety power switching components and configured for providing a protection mechanism for the power conversion device in the turning-off or turning-on selection process thereof.
In some embodiments, each of the at least two safety power switching components is corresponding to the at least two power conversion components, and a series connection is formed between each safety power switching component and the corresponding power conversion component, so that each of the safety power switching components provides a protection mechanism for each of the power conversion components respectively.
In some embodiments, each of the safety power switching components comprises at least two electric switches, used for providing a protection mechanism for the power conversion device in a boost mode and a buck mode, respectively.
In some embodiments, the two series-connected electric switches of each of the safety power switching components are two reverse-connected electric switches so as to operate in the boost mode and the buck mode, respectively.
In some embodiments, the voltage converter is a DC/DC converter.
In another exemplary aspect, the present disclosure provides a safety power switching device. The safety power switching device is connected to a power conversion device of a voltage converter and comprises at least two safety power switch components in parallel, configured for providing a protection mechanism for the power conversion device comprising at least two power conversion components in the turning-off or turning-on selection process thereof.
In another exemplary aspect, the present disclosure provides an electrified vehicle, comprising the voltage converter or the safety power switching device as described above.
With reference to the following description, these and other features, aspects and advantages of the present application will become easier to understand. The accompanying drawings incorporated in this specification and constituting a part thereof illustrate embodiments of the present application and are used to explain the principles of the present application together with said description.
BRIEF DESCRIPTION OF THE DRAWINGS
The complete and enlightening disclosure of the present application, including preferred embodiments thereof, is expounded herein for those skilled in the art. This specification refers to the drawings, in which:
Figure 1 is a schematic circuit diagram of a voltage converter according to an exemplary embodiment of the present disclosure; and
Figure 2 is a schematic circuit diagram of a voltage converter according to another exemplary embodiment of the present disclosure.
DETAILED DESCRIPTION OF THE INVENTION
Specific embodiments of the present disclosure are described in detail below in conjunction with the accompanying drawings. In the following detailed description of these specific embodiments, some well-known functions or structures are not described in detail in this specification to avoid unnecessary details which would affect the disclosure of the present disclosure. Each embodiment is provided for the purpose of explaining the present disclosure, without limiting the present disclosure. In fact, it will be apparent to those skilled in the art that various modifications and variations may be made to the present disclosure without departing from the scope or spirit of the present disclosure. For example, features illustrated or described as part of one embodiment can be used with another embodiment to produce a further embodiment. Therefore, the present disclosure is intended to cover such modifications and variations that fall within the scope of the appended claims and their equivalents.
As used herein, the terms "first", "second" and similar terms are used interchangeably to distinguish one element from another, rather than being intended to denote the position or importance of each element. As used herein, the terms "a", "an", "the" and "said" are intended to indicate the presence of one or more elements, unless otherwise clearly stated in the context. The terms "include", "comprise", and "have" are intended to be inclusive and mean that there may be other elements in addition to the element listed. The terms "connection" or "connected" and similar terms are not limited to a physical or mechanical connection, and may include an electrical connection, whether direct or indirect.
In addition, as used herein, the term “real-time” means that the times when associated events occur, the times when predetermined data is measured and collected, and the data processing times and systems correspond to at least one of the event and environment times. In the embodiments described herein, these times essentially occur instantaneously.
Reference is now made to the drawings, wherein the same numeral in each drawing represents the same element. Figures 1 and 2 are respectively schematic circuit diagrams of DC/DC converters of exemplary embodiments of the present disclosure.
In the embodiment shown in Figure 1, the DC/DC converter 100 may be implemented in an electrified vehicle equipped with a dual-voltage power supply network. A first on-board network may comprise a low-voltage source 4 of, for example, 12V and a second on-board network may comprise a high-voltage source 3 of for example, 48V. The low-voltage source 4 and high-voltage source 3 have the same electrical ground as a reference, and the DC/DC converter 100 is connected between the low-voltage source 4 and high-voltage source 3. In the embodiment shown, the DC/DC converter 100 can operate in a first pre-charging stage and a second pre-charging stage, thereby realizing pre-charging of predetermined voltage values. When the DC/DC converter 100 operates in the first pre-charging stage, a high-voltage side voltage value will be from 0V to be a first predetermined voltage value, e.g., a 12V battery voltage. When the DC/DC converter 100 operates in the second pre-charging stage, the high-voltage side voltage value will be from the first predetermined voltage value to be a second predetermined voltage value, e.g., from 12V to a 48V battery voltage.
Still referring to Figure 1, in this embodiment, the DC/DC converter 100 comprises a power conversion device 120 which may comprise a plurality of power conversion devices 2 connected in parallel. In the illustrated embodiment, the power conversion device 120 comprises three power conversion devices 2. The DC/DC converter 100 further comprises a safety power switching device 110, the safety power switching device 110 comprising multiple safety power switching components 1, for providing a protection mechanism for the DC/DC converter 100 in the turning- off or turning-on selection process thereof. In the illustrated embodiment, the safety power switching device 110 comprises three safety power switching components 1. The safety power switching components 1 are in one-to-one correspondence with the power conversion components 2, and a series connection is formed between each safety power switching component 1 and power conversion component 2 in one-to-one correspondence with each other. Each safety power switching component 1 comprises two power switches 11, 12 connected reversely and in series to operate in a boost mode and a buck mode, respectively and is thereby used for providing a protection mechanism for the power conversion device 120 in the boost mode and buck mode, respectively.
In some embodiments, the power switches 11, 12 include but are not limited to the MOSFET, insulated gate bipolar transistor (IGBT), integrated gate commutated thyristor (IGCT), injection enhanced gate transistor (IEGT), silicon carbide metal oxide semiconductor field effect transistor (SiC MOSFET), or other controllable electric switches capable of switching in ON and OFF states. In the embodiment as shown, the power switches 11 and 12 may be two common-source MOSFETs.
In the power conversion device 120 and the safety power switching device 110 of the voltage converter as shown in Figure 1 , each power conversion component 2 and the corresponding safety power switching component 1 are independent power stages connected in series. When a short circuit occurs in one of the power stages, the power switches 11 and 12 of the corresponding safety power switching component 1 will be controlled to close this individual power transfer path, while the other two independent power stages can still work normally and output two thirds of the power. Even in extreme conditions, the DC/DC converter 100 can maintain one third of the output power, and rely on the normal operation of only one power stage.
In some embodiments, the signal to control the OFF and ON of the power switches 11 and 12 may come from a controller, which may be any type of programmable device, such as a microcontroller, a micro control unit (MCU), a digital signal processor (DSP), etc.
Referring to Figure 2, which is a schematic circuit diagram of a voltage converter comprising more than three independent power stages connected in series. In this embodiment, the power conversion apparatus 120 of the voltage converter 200 comprises more than three power conversion components 2 connected in parallel, and each of the power conversion components 2 is connected to a corresponding safety power switching component 1 of the safety power switching device 110 in series. In extreme conditions, it is only necessary for one power stage to operate in the normal working state to ensure that the DC/DC converter 200 can have output power. This specification discloses the present disclosure by using embodiments, including preferred embodiments, and also enables those skilled in the art to implement the present disclosure, including making and using any apparatus or system and performing any incorporated method. The patentable scope of the present disclosure is defined by the claims and may include other embodiments conceived by those skilled in the art. Such other examples shall be within the scope of the claims if they include structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with no substantial differences from the literal language of the claims.

Claims

WHAT IS CLAIMED IS:
1. A voltage converter (100, 200) for an electrified vehicle, the voltage converter comprising: a power conversion device (120, 220), comprising at least two power conversion components (2) connected in parallel; and a safety power switching device (110, 210), connected to the power conversion device (120, 220), comprising at least two safety power switching components, configured for providing a protection mechanism for the power conversion device (120, 220) during a turning-off or turning- on selection process thereof.
2. The voltage converter according to claim 1, characterised in that: each of the at least two safety power switching components (1) is corresponding to the at least two power conversion components (2), and a series connection is formed between each safety power switching component and the corresponding power conversion component, so that each of the safety power switching components (1) provides a protection mechanism for each of the power conversion components (2) respectively.
3. The voltage converter according to claim 1, characterised in that: each of the safety power switching components (1) comprises at least two electric switches (11, 12) connected in series, configured for providing a protection mechanism for the power conversion device (120, 220) operating in a boost mode and a buck mode, respectively.
4. The voltage converter according to claim 3, characterised in that: the two electric switches (11, 12) of each of the safety power switching components (1) are two reverse-connected electric switches so that they operate in the boost mode and the buck mode, respectively.
5. The voltage converter according to claim 1, characterised in that: the voltage converter is a DC/DC converter.
7
6. A safety power switching device (110, 210) of a voltage converter (100) for an electrified vehicle, characterised in that: the safety power switching device (110, 210) is connected to a power conversion device (120, 220) of the voltage converter (100), the safety power switching device (110, 210) comprises: at least two safety power switching components (1) connected in parallel, and configured for providing a protection mechanism for the power conversion device (120, 220) comprising at least two power conversion components (2) in a turning-off or turning-on selection process thereof.
7. The safety power switching device according to claim 6, characterised in that: each of the at least two safety power switching components (1) is corresponding to each of the at least two power conversion components (2), and a series connection is formed between each safety power switching component and the corresponding power conversion component, so that each of the safety power switching components ( 1 ) provides a protection mechanism for each of the power conversion components (2) respectively.
8. The safety power switching device according to claim 6, characterised in that: each of the safety power switching components (1) comprises at least two electric switches (11, 12) connected in series, configured for providing a protection mechanism for the power conversion device (120, 220) operating in a boost mode and a buck mode, respectively.
9. The safety power switching device according to claim 8, characterised in that: the two electric switches (11, 12) of each of the safety power switching components (1) are two reverse-connected electric switches so that they operate in the boost mode and the buck mode, respectively.
10. An electrified vehicle, comprising the voltage converter according to any of claims 1 to 5, or the safety power switching device according to any of claims 6 to 9.
8
PCT/EP2022/086472 2021-12-22 2022-12-16 A safety power switching device, a voltage converter and an electrified vehicle WO2023117800A1 (en)

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CN202111585685.7 2021-12-22

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9893511B2 (en) * 2012-10-17 2018-02-13 Robert Bosch Gmbh Protective circuit assemblage for a multi-voltage electrical system
WO2018044078A1 (en) * 2016-08-30 2018-03-08 주식회사 엘지화학 Control system for switching dc-dc voltage converter from buck operation mode to safe operation mode
WO2021224192A1 (en) * 2020-05-04 2021-11-11 Prodrive Technologies Innovation Services B.V. Electrical power converter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9893511B2 (en) * 2012-10-17 2018-02-13 Robert Bosch Gmbh Protective circuit assemblage for a multi-voltage electrical system
WO2018044078A1 (en) * 2016-08-30 2018-03-08 주식회사 엘지화학 Control system for switching dc-dc voltage converter from buck operation mode to safe operation mode
WO2021224192A1 (en) * 2020-05-04 2021-11-11 Prodrive Technologies Innovation Services B.V. Electrical power converter

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