CN221574872U - Secondary protection system of protection board - Google Patents
Secondary protection system of protection board Download PDFInfo
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- CN221574872U CN221574872U CN202322764244.4U CN202322764244U CN221574872U CN 221574872 U CN221574872 U CN 221574872U CN 202322764244 U CN202322764244 U CN 202322764244U CN 221574872 U CN221574872 U CN 221574872U
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- 238000001514 detection method Methods 0.000 claims abstract description 19
- 239000003990 capacitor Substances 0.000 claims description 39
- 230000001681 protective effect Effects 0.000 claims 8
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- 238000012986 modification Methods 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000003993 interaction Effects 0.000 description 1
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Abstract
The application discloses a secondary protection system of a protection plate, and relates to the technical field of battery protection plates; the secondary current detection module comprises an operational amplifier, a first diode and a second diode, wherein two ends of the shunt module are respectively connected with an SRN end and an SRP end; the working coil of the release module is connected to the first pin and the second pin of the wiring socket module; the feedback module comprises a third switching diode; the operational amplifier is suitable for amplifying the voltage signal of the shunt and outputting the voltage signal to the MCU module, and the MCU module is suitable for converting current according to the voltage signal; the technical scheme provided by the application can reduce the probability that the loop cannot be disconnected after the protection board fails, and can truly improve the use safety performance of the battery.
Description
Technical Field
The application relates to the technical field of battery protection boards, in particular to a secondary protection system of a protection board.
Background
The protection board is one of the components of the battery, and when the battery fails (such as overcurrent, undervoltage, overvoltage, overtemperature, low temperature and the like), the output loop needs to be disconnected to ensure the service life and the use safety of the battery.
The conventional protection board controls the MOS transistor to disconnect the output loop through AFE (analog front end chip). When one of the AFE or MOS tubes fails, the loop cannot be disconnected.
Disclosure of utility model
The present application is directed to a protection board secondary protection circuit, so as to solve at least one of the above technical problems.
In order to solve the technical problems, the application provides a protection board secondary protection system, which comprises a secondary current detection module, a shunt module, a release module, a wiring socket module, a feedback module and an MCU module;
The secondary current detection module comprises an operational amplifier, a first diode and a second diode, wherein two ends of the current divider module are respectively connected with an SRN end and an SRP end, a first pin of the operational amplifier is connected with a charge-AD end, a second pin of the operational amplifier is connected with the SRN end, a third pin of the operational amplifier is connected with the SRP end, a fourth pin of the operational amplifier is connected with a GND end, a fifth pin of the operational amplifier is connected with the SRN end, a sixth pin of the operational amplifier is connected with the SRP end, a seventh pin of the operational amplifier is connected with the discharge-AD end, and an eighth pin of the operational amplifier is connected with a VCC end; the anode of the first diode is connected with GND, and the cathode of the first diode is connected with SRN; the anode of the second diode is connected with GND, and the cathode of the second diode is connected with SRP;
The tripping device module comprises a first switch diode, a second switch diode and an MOS tube, wherein a working coil of the tripping device module is connected to a first pin and a second pin of the wiring socket module, the first pin of the first switch diode is connected with a TK_EN end, the second pin is connected with a GND end, the third pin is connected with the first pin of the second switch diode, the second pin of the second switch diode is connected with the first pin of the MOS tube, the third pin is connected with a VCC end, the second pin of the MOS tube is connected with a GND end, and the third pin is connected with an AGND end;
the third pin of the wiring socket module is connected with the TK end;
The feedback module comprises a third switching diode, a first pin of the third switching diode is connected with a TK end, a second pin of the third switching diode is connected with a TK_FK_IO end, a third pin of the third switching diode is connected with an AGND end, and the TK_FK_IO end inputs a value to the MCU module;
The operational amplifier is suitable for amplifying the voltage signal of the shunt and outputting the voltage signal to the MCU module, and the MCU module is suitable for converting current according to the voltage signal.
Preferably, the secondary current detection module further comprises a third diode;
The third diode is a two-way voltage-stabilizing diode, the anode is connected with the GND end, the cathode of one way is connected with the charge-AD end, and the cathode of the other way is connected with the discharge-AD end.
Preferably, the secondary current detection module further comprises a first capacitor and a second capacitor;
One end of the first capacitor is connected between the second pin of the operational amplifier and the SRN end, and the other end of the first capacitor is connected between the third pin of the operational amplifier and the SRP end;
One end of the second capacitor is connected between the sixth pin of the operational amplifier and the SRP end, and the other end of the second capacitor is connected between the fifth pin of the operational amplifier and the SRN end.
Preferably, the trip module further comprises a fourth diode, wherein the fourth diode is a freewheeling diode, the anode of the fourth diode is connected with the third pin of the MOS tube, and the cathode of the fourth diode is connected with the second pin of the MOS tube.
Preferably, the trip module further comprises a fourth capacitor, and two ends of the fourth capacitor are respectively connected with an anode and a cathode of the fourth diode.
Preferably, the tripper module further comprises a fifth diode, wherein an anode of the fifth diode is connected with the TK_EN end, and a cathode of the fifth diode is connected with a first pin of the first switching diode.
Preferably, the secondary current detection module further includes a third capacitor, one end of the third capacitor is connected between the eighth pin of the operational amplifier and the VCC terminal, and the other end of the third capacitor is connected with the GND terminal.
Preferably, the operational amplifier is TP5532-SR.
Compared with the prior art, the application has the beneficial effects that: in the technical scheme provided by the application, when the MCU of the protection board cannot control the AFE (communication failure) after the AFE fails, the MCU sets the TK_EN of the release circuit clock to be high level, and the release is electrified to work so as to cut off a loop; when the battery fails, the AFE has the action of closing the MOS tube, but the MOS tube fails and cannot be closed, and then the MCU opens the release to disconnect the loop; therefore, the probability that the loop cannot be disconnected after the protection board fails can be reduced, and the use safety performance of the battery can be truly improved.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the application, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic circuit diagram of a secondary current detection module according to an embodiment of the application;
FIG. 2 is a schematic circuit diagram of a current divider module according to one embodiment of the present application;
FIG. 3 is a schematic circuit diagram of a trip unit module according to one embodiment of the present application;
FIG. 4 is a schematic circuit diagram of a feedback module according to an embodiment of the application;
FIG. 5 is a schematic circuit diagram of a patch jack module according to one embodiment of the present application;
Wherein: OPA, operational amplifier; d1, a first diode; d2, a second diode; d3, a third diode; d4, a fourth diode; d5, a fifth diode; c1, a first capacitor; c2, a second capacitor; c3, a third capacitor; c4, a fourth capacitor; q1, a first switching diode; q2, a second switching diode; q3, a third switching diode; CN1, a shunt; CN2, connection socket.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present application and are not to be construed as limiting the present application.
In the description of the present application, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted", "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected or integrally connected; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present application, it should be understood that the terms "upper," "lower," "side," "front," "rear," and the like indicate an orientation or a positional relationship based on installation, and are merely for convenience of description and simplification of the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application.
In the description of the present application, it should be noted that the term "and/or" is merely an association relationship describing an association object, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone.
It should be further noted that, in the embodiments of the present application, the same reference numerals denote the same components or the same parts, and for the same parts in the embodiments of the present application, reference numerals may be given to only one of the parts or the parts in the drawings, and it should be understood that, for other same parts or parts, the reference numerals are equally applicable.
For a further understanding of the utility model, its features and advantages, reference is now made to the following examples, which are illustrated in the accompanying drawings in which:
Examples
The conventional protection board controls the MOS transistor to disconnect the output loop through AFE (analog front end chip). When one of the AFE or MOS tubes fails, the loop cannot be disconnected; in order to solve the above technical problems, the present embodiment provides the following technical solutions:
referring to fig. 1-5, the present embodiment provides a protection board secondary protection system, which includes a secondary current detection module, a shunt module, a release module, a connection socket module, a feedback module, and an MCU module;
specifically, referring to fig. 1-2, the secondary current detection module includes an operational amplifier, a first diode, and a second diode, where two ends of the shunt module are respectively connected to an SRN end and an SRP end, a first pin of the operational amplifier is connected to a charge-AD end, a second pin is connected to the SRN end, a third pin is connected to the SRP end, a fourth pin is connected to the GND end, a fifth pin is connected to the SRN end, a sixth pin is connected to the SRP end, a seventh pin is connected to a discharge-AD end, and an eighth pin is connected to the VCC end; the anode of the first diode is connected with GND, and the cathode of the first diode is connected with SRN; the anode of the second diode is connected with GND, and the cathode of the second diode is connected with SRP;
Specifically, referring to fig. 3-5, the trip module includes a first switching diode, a second switching diode, and a MOS tube, wherein a working coil of the trip module is connected to a first pin and a second pin of the connection socket module, the first pin of the first switching diode is connected to a tk_en end, the second pin is connected to a GND end, the third pin is connected to the first pin of the second switching diode, the second pin of the second switching diode is connected to the first pin of the MOS tube, the third pin is connected to a VCC end, the second pin of the MOS tube is connected to the GND end, and the third pin is connected to an AGND end;
further, a third pin of the wiring socket module is connected with the TK end;
Specifically, the feedback module comprises a third switching diode, a first pin of the third switching diode is connected with a TK end, a second pin of the third switching diode is connected with a TK_FK_IO end, a third pin of the third switching diode is connected with an AGND end, and the TK_FK_IO end inputs a value to the MCU module;
Specifically, the operational amplifier is suitable for amplifying the voltage signal of the current divider and outputting the voltage signal to the MCU module, and the MCU module is suitable for converting current according to the voltage signal.
Specifically, the secondary current detection module further comprises a third diode;
Further, the third diode is a two-way voltage-stabilizing diode, the anode is connected with the GND end, the cathode of one way is connected with the charge-AD end, and the cathode of the other way is connected with the discharge-AD end;
Specifically, the secondary current detection module further comprises a first capacitor and a second capacitor;
One end of the first capacitor is connected between the second pin of the operational amplifier and the SRN end, and the other end of the first capacitor is connected between the third pin of the operational amplifier and the SRP end;
further, one end of the second capacitor is connected between the sixth pin of the operational amplifier and the SRP end, and the other end of the second capacitor is connected between the fifth pin of the operational amplifier and the SRN end;
Specifically, the secondary current detection module further comprises a third capacitor, one end of the third capacitor is connected between the eighth pin of the operational amplifier and the VCC end, and the other end of the third capacitor is connected with the GND end;
In the scheme, the secondary current detection module can prevent the MOS from failing and prevent the current detection circuit from failing when the AFE current sensor fails. The SRN and the SRP are respectively connected to two ends of the current divider, and the operational amplifier amplifies the voltage signal from the current divider and outputs the amplified voltage signal to the MCU module which converts the voltage into the current.
In some embodiments, the first diode and the second diode are zener diodes that prevent damage to the TP5532-SR from excessive voltages. The first capacitor and the second capacitor play a role of filtering, and the third diode is a two-way voltage stabilizing diode which prevents how high a voltage is input to the MCU module.
In some embodiments, the op-amp is a TP5532-SR, which is a low power, rail-to-rail, zero drift two-way op-amp.
Specifically, the release module further comprises a fourth diode, wherein the fourth diode is a freewheeling diode, the anode of the fourth diode is connected with the third pin of the MOS tube, and the cathode of the fourth diode is connected with the second pin of the MOS tube.
Further, the release module further comprises a fourth capacitor, and two ends of the fourth capacitor are respectively connected with the anode and the cathode of the fourth diode.
Specifically, the tripper module further comprises a fifth diode, wherein an anode of the fifth diode is connected with the TK_EN end, and a cathode of the fifth diode is connected with a first pin of the first switch diode.
In the above scheme, when the loop cannot be disconnected after the MOS tube is prevented from being invalid, the loop can be disconnected by using the release. CN10 is a connection socket, and the working coil of the trip unit is connected to pins 1 and 2 of CN 10. When TK_EN is at a high level, the first switching diode is conducted, the second switching diode is also conducted, the G pole voltage of the third switching diode is 12V, the MOS tube is conducted, and the release works. When tk_en is low, the trip is not operated. The fourth diode is a follow current diode, so that the third switching diode is prevented from being damaged by reverse electromotive force generated from the moment of operation to the moment of non-operation of the release, and the fifth switching diode prevents reverse voltage from being input into the MCU.
TK is a release feedback signal, TK_FK_IO is input to the MCU, and the MCU detects the state of the release through the on and off of the third switching diode.
The scheme can reduce the probability that the loop cannot be disconnected after the protection board fails, can truly improve the use safety performance of the battery, and has passed IEC6022 authentication.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.
The foregoing description is only of the preferred embodiments of the present application, and is not intended to limit the application in any way, but any simple modification, equivalent variation and modification of the above embodiments according to the technical principles of the present application fall within the scope of the technical solutions of the present application.
Claims (8)
1. A protective plate secondary protection system, characterized in that: the device comprises a secondary current detection module, a shunt module, a release module, a wiring socket module, a feedback module and an MCU module;
The secondary current detection module comprises an operational amplifier, a first diode and a second diode, wherein two ends of the current divider module are respectively connected with an SRN end and an SRP end, a first pin of the operational amplifier is connected with a charge-AD end, a second pin of the operational amplifier is connected with the SRN end, a third pin of the operational amplifier is connected with the SRP end, a fourth pin of the operational amplifier is connected with a GND end, a fifth pin of the operational amplifier is connected with the SRN end, a sixth pin of the operational amplifier is connected with the SRP end, a seventh pin of the operational amplifier is connected with the discharge-AD end, and an eighth pin of the operational amplifier is connected with a VCC end; the anode of the first diode is connected with GND, and the cathode of the first diode is connected with SRN; the anode of the second diode is connected with GND, and the cathode of the second diode is connected with SRP;
The tripping device module comprises a first switch diode, a second switch diode and an MOS tube, wherein a working coil of the tripping device module is connected to a first pin and a second pin of the wiring socket module, the first pin of the first switch diode is connected with a TK_EN end, the second pin is connected with a GND end, the third pin is connected with the first pin of the second switch diode, the second pin of the second switch diode is connected with the first pin of the MOS tube, the third pin is connected with a VCC end, the second pin of the MOS tube is connected with a GND end, and the third pin is connected with an AGND end;
the third pin of the wiring socket module is connected with the TK end;
The feedback module comprises a third switching diode, a first pin of the third switching diode is connected with a TK end, a second pin of the third switching diode is connected with a TK_FK_IO end, a third pin of the third switching diode is connected with an AGND end, and the TK_FK_IO end inputs a value to the MCU module;
The operational amplifier is suitable for amplifying the voltage signal of the shunt and outputting the voltage signal to the MCU module, and the MCU module is suitable for converting current according to the voltage signal.
2. The protective plate secondary protection system of claim 1, wherein: the secondary current detection module further comprises a third diode;
The third diode is a two-way voltage-stabilizing diode, the anode is connected with the GND end, the cathode of one way is connected with the charge-AD end, and the cathode of the other way is connected with the discharge-AD end.
3. The protective plate secondary protection system of claim 1, wherein: the secondary current detection module further comprises a first capacitor and a second capacitor;
One end of the first capacitor is connected between the second pin of the operational amplifier and the SRN end, and the other end of the first capacitor is connected between the third pin of the operational amplifier and the SRP end;
One end of the second capacitor is connected between the sixth pin of the operational amplifier and the SRP end, and the other end of the second capacitor is connected between the fifth pin of the operational amplifier and the SRN end.
4. The protective plate secondary protection system of claim 1, wherein: the tripper module further comprises a fourth diode, the fourth diode is a freewheeling diode, the anode of the fourth diode is connected with the third pin of the MOS tube, and the cathode of the fourth diode is connected with the second pin of the MOS tube.
5. The protective plate secondary protection system of claim 4, wherein: the release module further comprises a fourth capacitor, and two ends of the fourth capacitor are respectively connected with the anode and the cathode of the fourth diode.
6. The protective plate secondary protection system of claim 1, wherein: the tripper module further comprises a fifth diode, wherein the anode of the fifth diode is connected with the TK_EN end, and the cathode of the fifth diode is connected with the first pin of the first switching diode.
7. The protective plate secondary protection system of claim 1, wherein: the secondary current detection module further comprises a third capacitor, one end of the third capacitor is connected between the eighth pin of the operational amplifier and the VCC end, and the other end of the third capacitor is connected with the GND end.
8. The protective plate secondary protection system of claim 1, wherein: the operational amplifier is TP5532-SR.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322764244.4U CN221574872U (en) | 2023-10-16 | 2023-10-16 | Secondary protection system of protection board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322764244.4U CN221574872U (en) | 2023-10-16 | 2023-10-16 | Secondary protection system of protection board |
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| Publication Number | Publication Date |
|---|---|
| CN221574872U true CN221574872U (en) | 2024-08-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322764244.4U Active CN221574872U (en) | 2023-10-16 | 2023-10-16 | Secondary protection system of protection board |
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| Country | Link |
|---|---|
| CN (1) | CN221574872U (en) |
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2023
- 2023-10-16 CN CN202322764244.4U patent/CN221574872U/en active Active
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