CN113928134A - Overvoltage protection circuit and car - Google Patents
Overvoltage protection circuit and car Download PDFInfo
- Publication number
- CN113928134A CN113928134A CN202010606840.8A CN202010606840A CN113928134A CN 113928134 A CN113928134 A CN 113928134A CN 202010606840 A CN202010606840 A CN 202010606840A CN 113928134 A CN113928134 A CN 113928134A
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- protection circuit
- common mode
- terminal
- mode inductor
- controller
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- 230000001052 transient effect Effects 0.000 claims description 54
- 239000003990 capacitor Substances 0.000 claims description 28
- 230000002159 abnormal effect Effects 0.000 description 10
- 238000012544 monitoring process Methods 0.000 description 3
- 230000002457 bidirectional effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
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Classifications
-
- 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
-
- 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
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
Abstract
The invention provides an overvoltage protection circuit and an automobile, wherein the overvoltage protection circuit is arranged between a Controller Area Network (CAN) transceiver of the automobile and a connector of a controller, and comprises: the common mode inductor (L) is connected with a first end and a second end of the common mode inductor (L) and a CAN transceiver, and a third end and a fourth end of the common mode inductor (L) are connected with a connector of a controller; a first protection circuit connected between the common mode inductance (L) and a connector of the controller; and a second protection circuit connected between the CAN transceiver and the common mode inductor (L). Above-mentioned scheme, through set up the second grade protection circuit in the quick CAN circuit that fills at the vehicle, CAN carry out the clamper with the high voltage that outside unusual charging pile produced effectively, reduce the vehicle and fill the burning out that electric pile caused the quick CAN chip when filling soon to reduce the after-sale quality problem of vehicle, promote customer satisfaction.
Description
Technical Field
The invention relates to the field of automobiles, in particular to an overvoltage protection circuit and an automobile.
Background
At present, the quality of the quick charging piles in the market is uneven, and part of the charging piles may output abnormal high voltage, which does not meet the requirement of the direct current charging standard ISO11898-2, so that a quick charging CAN (Controller Area Network) chip on a Vehicle Control Unit (VCU) product may be damaged, and further, a Vehicle cannot be quickly charged.
Therefore, the VCU with the function of the fast charging CAN circuit needs to have the capability of resisting the abnormal high voltage generated by the fast charging pile.
Typically, the conventional CAN circuit design in the industry is a primary protection circuit, as shown in fig. 1. Under the condition that the CAN circuit has the common-mode inductor L, CAN signals CAN generate large burrs after passing through the common-mode inductor L, so that the CAN signals exceed the voltage value which CAN be borne by a CAN transceiver, the CAN transceiver chip is damaged, and the vehicle CAN not be charged quickly.
Disclosure of Invention
The embodiment of the invention provides an overvoltage protection circuit and an automobile, and aims to solve the problem that a quick charge CAN chip is easily damaged when a charging pile outputs abnormal high voltage in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
according to an aspect of the present invention, there is provided an overvoltage protection circuit provided between a controller area network, CAN, transceiver of a vehicle and a connector of a controller, comprising:
the controller comprises a common-mode inductor, a controller and a controller, wherein a first end and a second end of the common-mode inductor are connected with a CAN transceiver, and a third end and a fourth end of the common-mode inductor are connected with a connector of the controller;
the first protection circuit is connected between the common mode inductor and a connector of the controller; and a second protection circuit connected between the CAN transceiver and the common mode inductor.
Optionally, the controller includes at least one of a vehicle Control Unit VCU, a Battery Management System (BMS), and a Motor Control Unit (MCU).
Optionally, the first protection circuit comprises:
a first pin of the first transient diode is connected with the fourth end of the common mode inductor, and a second pin of the first transient diode is grounded;
and a first pin of the second transient diode is connected with a third end of the common mode inductor, and a second pin of the second transient diode is grounded.
Optionally, the second protection circuit comprises:
and a first pin of the SOT packaged transient diode is connected with a first end of the common-mode inductor, a second pin of the SOT packaged transient diode is connected with a second end of the common-mode inductor, and a third pin of the SOT packaged transient diode is grounded.
Optionally, the overvoltage protection circuit further comprises:
a first resistor and a second resistor disposed between the common mode inductor and the first protection circuit; the first end of the first resistor is connected with the third end of the common-mode inductor; a first end of the second resistor is connected with a second end of the first resistor, and a second end of the second resistor is connected with a fourth end of the common mode inductor;
and a first end of the first capacitor is connected with a second end of the first resistor, and a second end of the first capacitor is grounded.
Optionally, the overvoltage protection circuit further comprises:
a second capacitor and a third capacitor disposed between the first protection circuit and a connector of the controller;
the first end of the second capacitor is connected with the second end of the connector of the controller, and the second end of the second capacitor is grounded; the first end of the third capacitor is connected with the first end of the connector of the controller, and the second end of the third capacitor is grounded.
Optionally, the first transient diode and the second transient diode are in an SMB package.
Optionally, the first transient diode and the second transient diode are both bidirectional transient diodes.
Optionally, the SOT packaged transient diode is in the form of a small outline transistor SOT package.
According to another aspect of the invention, there is provided an automobile comprising an overvoltage protection circuit as described above.
The invention has the beneficial effects that:
above-mentioned scheme, through set up the second grade protection circuit in the quick CAN circuit that fills at the vehicle, CAN carry out the clamper with the outside high voltage that electric pile produced unusually effectively, reduce the vehicle and fill the electric pile because unusually and lead to the circumstances that CAN not carry out the vehicle and fill soon to burn out that the CAN chip caused and take place when filling soon to reduce the after-sale quality problem of vehicle, promote customer satisfaction.
Drawings
FIG. 1 shows a primary protection circuit of a CAN circuit in the prior art;
FIG. 2 is a circuit diagram of an over-voltage protection circuit provided by an embodiment of the present invention;
fig. 3 shows a CAN protection diagram of the overvoltage protection circuit according to the embodiment of the present invention.
Description of reference numerals:
an L-common mode inductor; d1 — first transient diode; d2 — second transient diode; D3-SOT packaged transient diode; r1 — first resistance; r2 — second resistance; c1 — first capacitance; c2 — second capacitance; c3-third capacitance.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The invention provides an overvoltage protection circuit and an automobile, aiming at the problem that a quick charging CAN chip is easy to damage when a charging pile outputs abnormal high voltage.
As shown in fig. 2, an embodiment of the present invention provides an overvoltage protection circuit disposed between a controller area network CAN transceiver and a controller connector of a vehicle, including:
a first end and a second end of the common mode inductor L are connected with the CAN transceiver, and a third end and a fourth end of the common mode inductor L are connected with a connector of the controller;
the first protection circuit is connected between the common-mode inductor L and a connector of the controller; and the second protection circuit is connected between the CAN transceiver and the common-mode inductor L.
It should be noted that the CAN transceiver may also be connected to the MCU, and after the fast-charging CAN signal enters the CAN transceiver, the CAN transceiver may send a signal to the MCU for communication.
According to one embodiment of the invention, aiming at the condition that the quality parameters of the quick-charging piles in the current market are not uniform, the overvoltage protection circuit CAN be arranged in a quick-charging CAN circuit of a vehicle, and the overvoltage protection circuit CAN be provided with a secondary protection function, namely the first protection circuit and the second protection circuit, and through the secondary protection, the voltage resistance of the circuit CAN reach 10 times of the interference margin of the abnormal quick-charging piles.
Specifically, the first protection circuit can be used for primary protection to clamp abnormal high voltage from the quick charging pile; after passing through the common-mode inductor L, the second protection circuit performs secondary protection to absorb burrs passing through the common-mode inductor L, so that the voltage is clamped in a bearable range of a CAN chip (namely the chip of the CAN transceiver), and the CAN chip is protected from being damaged.
Optionally, the controller comprises at least one of a vehicle control unit VCU, a battery management system BMS, and a motor control unit MCU.
That is, the overvoltage protection circuit provided by the embodiment of the invention is suitable for a place where a fast-charging CAN circuit is provided on a vehicle, such as a circuit between a CAN transceiver and a connector of a VCU or a circuit between a CAN transceiver and a connector of a BMS, and the like.
Optionally, the first protection circuit comprises:
a first transient diode D1, a first pin of the first transient diode D1 is connected to the fourth terminal of the common mode inductor L, and a second pin is grounded;
and a second transient diode D2, wherein a first pin of the second transient diode D2 is connected with a third end of the common mode inductor L, and a second pin is grounded.
It should be noted that, according to an embodiment of the present invention, the first protection circuit may include two high-power Transient diodes (TVS), that is, the first Transient diode D1 and the second Transient diode D2, to perform a primary protection, so as to clamp the abnormally high Voltage from the fast charging post, so that the Voltage is stabilized to a certain state. Wherein the first transient diode D1 and the second transient diode D2 may take the form of SMB packages; the first transient diode D1 and the second transient diode D2 may both be bidirectional transient diodes.
Optionally, the second protection circuit comprises:
the SOT package transient diode D3 is characterized in that a first pin of the SOT package transient diode D3 is connected with a first end of the common-mode inductor L, a second pin of the SOT package transient diode D3 is connected with a second end of the common-mode inductor L, and a third pin of the SOT package transient diode D3 is grounded.
It should be noted that the voltage of the circuit is already clamped after the first transient diode D1 and the first transient diode D2 are protected. After the voltage passes through the common-mode inductor L, the second protection circuit CAN be used for secondary protection and is used for absorbing burrs of the voltage passing through the common-mode inductor L so that the voltage is clamped in a bearable range of the CAN chip.
The second protection circuit may include an SOT package transient diode D3, and optionally, the SOT package transient diode D3 may be in an SOT (small outline transistor) package form. Specifically, the SOT packaged transient diode D3 may include two transient diodes, that is, the SOT packaged transient diode D3 may be formed by two transient diodes through packaging.
The embodiment of the invention is an implementable scheme which CAN resist the abnormal charging pile and is obtained after a large number of tests and verifications, and the two-stage protection is added to the quick-charging CAN circuit, so that the anti-pressure capability of the quick-charging CAN circuit on the abnormal quick-charging pile CAN be improved, the quick-charging CAN chip is protected, and the invention is safe, reliable and strong in applicability.
Optionally, the overvoltage protection circuit further comprises:
a first resistor R1 and a second resistor R2 disposed between the common mode inductor L and the first protection circuit; the first end of the first resistor R1 is connected with the third end of the common-mode inductor L; a first end of the second resistor R2 is connected with a second end of the first resistor R1, and a second end of the second resistor R2 is connected with a fourth end of the common-mode inductor L;
a first capacitor C1, a first terminal of the first capacitor C1 is connected to the second terminal of the first resistor R1, and a second terminal of the first capacitor C1 is grounded.
It should be noted that the first resistor R1 and the second resistor R2 are two terminal matching resistors of the overvoltage protection circuit, and the first capacitor C1 is a filter capacitor. In general, two terminal matching resistors (i.e., the first resistor R1 and the second resistor R2) that should be provided in the CAN network are respectively installed at the two farthest ends of the physical harness. Specifically, whether the terminal matching resistor is installed in the Circuit or not needs to be determined according to the installation position of a controller (such as a VCU) of the entire CAN network, but when a Printed Circuit Board (PCB for short) is designed, the installation position of the terminal matching resistor needs to be reserved.
Optionally, the overvoltage protection circuit further comprises:
a second capacitor C2 and a third capacitor C3 disposed between the first protection circuit and a connector of the controller;
wherein a first terminal of the second capacitor C2 is connected with a second terminal of the connector of the controller, and a second terminal of the second capacitor C2 is grounded; the first terminal of the third capacitor C3 is connected to the first terminal of the controller connector, and the second terminal of the third capacitor C3 is grounded.
It should be noted that, in an embodiment of the present invention, the overvoltage protection circuit is located between a connector (i.e., the connector shown in fig. 3) of the controller and the CAN transceiver, when the vehicle is charged quickly, a quick-charge CAN signal enters the VCU from the connector, and is subjected to ESD (Electro-Static discharge) protection through an EMC (Electro-magnetic Compatibility) second capacitor C2 and a third capacitor C3, and is subjected to primary protection through a high-power TVS (i.e., a first transient diode D1 and a second transient diode D2) to clamp an abnormally high voltage from the quick-charge pile, and then is subjected to secondary protection through a common-mode inductor L to prevent the CAN chip from being damaged by the abnormally high voltage.
It should be further noted that, as shown in fig. 3, a plurality of monitoring points may be respectively disposed on the lines of the first protection circuit and the second protection circuit, for example, monitoring points 1 and 3 may be disposed on the line of the first protection circuit as the primary protection, and monitoring points 2 and 4 may be disposed on the line of the second protection circuit as the secondary protection, so as to monitor whether the voltage signal passing through the protection circuit is normal, so as to ensure the normal operation of the vehicle during the rapid charging, and protect the vehicle safety.
In the embodiment of the invention, the secondary protection circuit is arranged in the quick charging CAN circuit of the vehicle, so that high voltage generated by an external abnormal charging pile CAN be effectively clamped, the situation that the vehicle cannot be quickly charged due to the burning of the abnormal charging pile to the quick charging CAN chip when the vehicle is quickly charged is reduced, the after-sale quality problem of the vehicle is reduced, and the customer satisfaction is improved; the scheme is an implementable scheme obtained after a large number of tests and verifications, and is safe, reliable and high in applicability.
The embodiment of the invention also provides an automobile which comprises the overvoltage protection circuit.
While the preferred embodiments of the present invention have been described, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.
Claims (10)
1. An overvoltage protection circuit provided between a Controller Area Network (CAN) transceiver of a vehicle and a connector of a controller, comprising:
the common mode inductor (L) is connected with a first end and a second end of the common mode inductor (L) and a CAN transceiver, and a third end and a fourth end of the common mode inductor (L) are connected with a connector of a controller;
a first protection circuit connected between the common mode inductance (L) and a connector of the controller; and the number of the first and second groups,
a second protection circuit connected between the CAN transceiver and the common mode inductor (L).
2. The overvoltage protection circuit of claim 1, wherein the controller comprises at least one of a Vehicle Control Unit (VCU), a Battery Management System (BMS), and a Motor Control Unit (MCU).
3. The overvoltage protection circuit of claim 1, wherein the first protection circuit comprises:
a first transient diode (D1), wherein a first pin of the first transient diode (D1) is connected with the fourth end of the common mode inductor (L), and a second pin is grounded;
a second transient diode (D2), wherein the first pin of the second transient diode (D2) is connected with the third end of the common mode inductor (L), and the second pin is grounded.
4. The overvoltage protection circuit of claim 1, wherein the second protection circuit comprises:
a SOT package transient diode (D3), wherein a first pin of the SOT package transient diode (D3) is connected with a first end of the common mode inductor (L), a second pin is connected with a second end of the common mode inductor (L), and a third pin is grounded.
5. The overvoltage protection circuit of claim 1, further comprising:
a first resistor (R1) and a second resistor (R2) disposed between the common mode inductance (L) and the first protection circuit; wherein a first terminal of the first resistor (R1) is connected to a third terminal of the common mode inductor (L); a first terminal of the second resistor (R2) is connected to a second terminal of the first resistor (R1), and a second terminal of the second resistor (R2) is connected to a fourth terminal of the common mode inductor (L);
a first capacitor (C1), a first terminal of the first capacitor (C1) being connected to the second terminal of the first resistor (R1), and a second terminal of the first capacitor (C1) being connected to ground.
6. The overvoltage protection circuit of claim 1, further comprising:
a second capacitance (C2) and a third capacitance (C3) disposed between the first protection circuit and a connector of the controller;
wherein a first terminal of the second capacitor (C2) is connected with a second terminal of the connector of the controller, and a second terminal of the second capacitor (C2) is grounded; the first terminal of the third capacitor (C3) is connected to the first terminal of the controller connector, and the second terminal of the third capacitor (C3) is grounded.
7. The overvoltage protection circuit of claim 3, wherein the first transient diode (D1) and the second transient diode (D2) are in the form of an SMB package.
8. The overvoltage protection circuit of claim 3, wherein the first transient diode (D1) and the second transient diode (D2) are bi-directional transient diodes.
9. The overvoltage protection circuit of claim 4, wherein the SOT packaged transient diode (D3) is in the form of a Small Outline Transistor (SOT) package.
10. A motor vehicle, characterized in that it comprises an overvoltage protection circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010606840.8A CN113928134A (en) | 2020-06-29 | 2020-06-29 | Overvoltage protection circuit and car |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010606840.8A CN113928134A (en) | 2020-06-29 | 2020-06-29 | Overvoltage protection circuit and car |
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| Publication Number | Publication Date |
|---|---|
| CN113928134A true CN113928134A (en) | 2022-01-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010606840.8A Pending CN113928134A (en) | 2020-06-29 | 2020-06-29 | Overvoltage protection circuit and car |
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| Country | Link |
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| CN (1) | CN113928134A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117110706A (en) * | 2023-10-25 | 2023-11-24 | 青岛鼎信通讯股份有限公司 | Direct-current electric energy metering device and method |
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