CN216904278U - BMS power automatic protection circuit - Google Patents
BMS power automatic protection circuit Download PDFInfo
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- CN216904278U CN216904278U CN202123396410.7U CN202123396410U CN216904278U CN 216904278 U CN216904278 U CN 216904278U CN 202123396410 U CN202123396410 U CN 202123396410U CN 216904278 U CN216904278 U CN 216904278U
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- 230000005669 field effect Effects 0.000 claims description 16
- 230000002265 prevention Effects 0.000 abstract description 13
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- 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
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Abstract
The utility model discloses an automatic protection circuit of a BMS power supply, which comprises a BMS auxiliary power supply, a main charging switch and a backflow prevention protection unit, wherein the main charging switch is a double-pole double-throw switch, the backflow prevention protection unit is connected in series with one of the single-pole double-throw switches, the BMS auxiliary power supply is connected with a charging interface of an electric automobile after being connected in series with the double-pole double-throw switches, a voltage sensor is installed at the output end of the BMS auxiliary power supply and used for sending the voltage of a collecting output end to the backflow prevention protection unit, the backflow prevention protection unit is used for comparing the voltage of the output end with the set output voltage of the BMS auxiliary power supply, and when the output voltage is greater than the set output voltage, the automatic protection circuit of the BMS auxiliary power supply and the electric automobile is cut off. According to the utility model, the backflow prevention protection unit and the charging loop of the BMS auxiliary power supply are separately and independently arranged, so that the charging loss is greatly reduced.
Description
Technical Field
The utility model relates to the technical field of charging protection, in particular to an automatic protection circuit of a BMS power supply.
Background
National standards (GBT 18487.1-2015/electric vehicle conductive charging system/part 1 general requirements) specify: the voltage grade of the BMS auxiliary power supply of the electric automobile is 12V +/-5%, and the current is less than or equal to 10A; in practical application, the BMS auxiliary power supply selected for use by the vehicle models with large battery capacities such as logistics vehicles and buses is supplied by a 24V storage battery, and when the charging equipment is switched on by the electric vehicle, the power can flow backwards, so that the charging equipment can be directly burned out.
In the prior art, a diode or other backflow prevention devices such as a field effect transistor are generally connected in series in a charging loop of a charger to prevent current backflow, and in the mode of directly connecting the backflow prevention devices in series in the charging loop, as the output current of the BMS auxiliary power supply is large, large loss can be generated through the diode or other devices.
Accordingly, the present application provides a BMS power supply automatic protection circuit.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an automatic protection circuit of a BMS power supply, and aims to solve the problem that the loss of the conventional BMS protection circuit is large.
The utility model is realized by the following steps:
the utility model provides a BMS power automatic protection circuit, includes BMS auxiliary power supply, the main switch that charges and prevent flowing backward the protection unit, the main switch that charges is double-pole double-throw switch, prevent flowing backward the protection unit with one of them switch of single-pole double-throw switch is established ties, BMS auxiliary power supply with the interface that charges of connecting electric automobile after the double-pole double-throw switch is established ties BMS auxiliary power supply's output installs voltage sensor, voltage sensor is used for sending the collection output end voltage to prevent flowing backward the protection unit, prevent flowing backward the protection unit and be used for with output end voltage and BMS auxiliary power supply's settlement output voltage carry out the comparison, when output voltage is greater than settlement output voltage, be used for controlling double-pole double-throw switch disconnection, cut off BMS auxiliary power supply with electric automobile's charging loop.
Further, the backflow prevention protection unit comprises a voltage comparator, a voltage signal generator charging main switch coil and a field effect tube, wherein the voltage signal generator is used for generating 12V voltage and is connected with a first input end of the voltage comparator, an output end of the voltage sensor is connected with a second input end of the voltage comparator, an output end of the voltage comparator is connected with an input end of the field effect tube, an output end of the field effect tube is sequentially connected with the charging main switch coil and one end of the double-pole double-throw switch in series, and the other end of the double-pole double-throw switch is connected with the voltage signal generator to form a series loop.
Further, the voltage comparator is a normal phase comparator, the voltage signal generator is connected with a normal phase input end of the voltage comparator, and an output end of the voltage sensor is connected with an inverted phase input end of the voltage comparator.
Further, the voltage comparator is an inverting comparator, the voltage signal generator is connected with an inverting input end of the voltage comparator, and an output end of the voltage sensor is connected with a non-inverting input end of the voltage comparator.
Further, the field effect transistor is an N-channel field effect transistor.
Compared with the prior art, the utility model has the beneficial effects that: the anti-backflow protection unit and the charging loop of the BMS auxiliary power supply are separately and independently arranged, a double-pole double-throw switch is used for generating a correlation relationship, and the anti-backflow protection unit controls the charging of the BMS auxiliary power supply to be switched on and off by controlling the double-pole double-throw switch. The charging loss is greatly reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic diagram of an automatic protection circuit of a BMS power supply of the present invention;
fig. 2 is a schematic diagram of an automatic protection circuit of a BMS power supply according to another embodiment of the present invention.
Wherein, 1, BMS auxiliary power supply; 2. a charging interface of the electric automobile; 3. a charging main switch; 4. a voltage sensor; 5. a voltage signal generator; 6. a voltage comparator; 7. a field effect transistor; 8. charging the main switch coil.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The first embodiment is as follows:
as shown in fig. 1, an automatic protection circuit of a BMS power supply includes a BMS auxiliary power supply 1, a charging main switch 3 and a backflow prevention protection unit, the charging main switch 3 is a double-pole double-throw switch, the backflow prevention protection unit is connected in series with one switch of the single-pole double-throw switch, the BMS auxiliary power supply 1 is connected with the double-pole double-throw switch in series and then is connected with a charging interface of the electric automobile, a voltage sensor 4 is installed at the output end of the BMS auxiliary power supply 1, the voltage sensor 4 is used for transmitting the voltage of the acquisition output end to the backflow prevention protection unit, the backflow prevention protection unit is used for comparing the output terminal voltage with a set output voltage of the BMS auxiliary power supply 1, and when the output voltage is greater than the set output voltage, the switching device is used for controlling the double-pole double-throw switch to be switched off and cutting off the BMS auxiliary power supply 1 and the charging loop of the electric automobile.
Further, the backflow prevention protection unit comprises a voltage comparator 6, a voltage signal generator 5, a charging main switch coil 8 and a field-effect tube 7, wherein the voltage signal generator 5 is used for generating 12V voltage and is connected with a first input end of the voltage comparator 6, an output end of the voltage sensor 4 is connected with a second input end of the voltage comparator 6, an output end of the voltage comparator 6 is connected with an input end of the field-effect tube 7, an output end of the field-effect tube 7 is sequentially connected with the charging main switch coil 8 and one end of the double-pole double-throw switch in series, and the other end of the double-pole double-throw switch is connected with the voltage signal generator 5 to form a series loop.
In this embodiment, the source of the fet serves as the input terminal and the drain serves as the output terminal.
Further, the voltage comparator 6 is a positive phase comparator, the voltage signal generator 5 is connected to a positive phase input terminal of the voltage comparator 6, and an output terminal of the voltage sensor 4 is connected to a negative phase input terminal of the voltage comparator 6.
Further, the field effect transistor 7 is an N-channel field effect transistor 7.
The working principle is as follows:
the voltage signal generator 5 generates a 12V voltage signal, the voltage signal is input to a positive phase input end of the voltage comparator 6, a negative phase input end of the voltage comparator 6 receives an output end voltage signal of the BMS auxiliary power supply 1 collected by the voltage sensor 4, when the output end voltage signal is greater than 12V, the voltage comparator 6 outputs a low level signal, the low level signal controls the N-channel field effect transistor 7 to be cut off, the charging main switch coil 8 loses power, the charging main switch 3 is switched off, and therefore a charging loop of the BMS auxiliary power supply 1 and the electric automobile is cut off, charging equipment is protected, and power supply backflow is prevented.
Example two:
the difference from the first embodiment is that the voltage comparator 6 is an inverting comparator, and as shown in fig. 2, the voltage signal generator 5 is connected to an inverting input terminal of the voltage comparator 6, and the output terminal of the voltage sensor 4 is connected to a non-inverting input terminal of the voltage comparator 6.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The utility model provides a BMS power automatic protection circuit, its characterized in that includes BMS auxiliary power supply, charges main switch and prevents flowing backward the protection unit, the main switch that charges is double-pole double-throw switch, prevent flowing backward the protection unit with one of them switch of double-pole double-throw switch is established ties, BMS auxiliary power supply with the interface that charges of electric automobile is connected to double-pole double-throw switch after establishing ties BMS auxiliary power supply's output installs voltage sensor, voltage sensor is used for sending the collection output voltage to prevent flowing backward the protection unit, prevent flowing backward the protection unit and be used for with output voltage and BMS auxiliary power supply's settlement output voltage carry out the comparison, when output voltage is greater than settlement output voltage, be used for controlling double-pole double-throw switch disconnection, cut off BMS auxiliary power supply with electric automobile's charging circuit.
2. The automatic protection circuit of BMS power supply according to claim 1, wherein said protection unit comprises a voltage comparator, a voltage signal generator charging main switch coil and a field effect transistor, said voltage signal generator is used for generating 12V voltage and is connected with the first input end of said voltage comparator, the output end of said voltage sensor is connected with the second input end of said voltage comparator, the output end of said voltage comparator is connected with the input end of said field effect transistor, the output end of said field effect transistor is connected with said charging main switch coil and one end of said double-pole double-throw switch in series, the other end of said double-pole double-throw switch is connected with said voltage signal generator to form a series loop.
3. The BMS power supply auto-protection circuit of claim 2, wherein the voltage comparator is a positive phase comparator, the voltage signal generator is connected to a positive phase input of the voltage comparator, and the output of the voltage sensor is connected to an inverted phase input of the voltage comparator.
4. The BMS power supply automatic protection circuit of claim 3, wherein the voltage comparator is an inverting comparator, the voltage signal generator is connected with an inverting input terminal of the voltage comparator, and the output terminal of the voltage sensor is connected with a non-inverting input terminal of the voltage comparator.
5. The BMS power supply automatic protection circuit according to claim 3 or 4, wherein the FET is an N-channel FET.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123396410.7U CN216904278U (en) | 2021-12-30 | 2021-12-30 | BMS power automatic protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123396410.7U CN216904278U (en) | 2021-12-30 | 2021-12-30 | BMS power automatic protection circuit |
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| CN216904278U true CN216904278U (en) | 2022-07-05 |
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| CN202123396410.7U Active CN216904278U (en) | 2021-12-30 | 2021-12-30 | BMS power automatic protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115137447A (en) * | 2022-09-02 | 2022-10-04 | 深圳北芯医疗科技有限公司 | Method and device for protecting components of therapeutic apparatus and therapeutic apparatus |
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2021
- 2021-12-30 CN CN202123396410.7U patent/CN216904278U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115137447A (en) * | 2022-09-02 | 2022-10-04 | 深圳北芯医疗科技有限公司 | Method and device for protecting components of therapeutic apparatus and therapeutic apparatus |
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