CN217769458U - Double protection circuit of low-voltage parallel electric box - Google Patents
Double protection circuit of low-voltage parallel electric box Download PDFInfo
- Publication number
- CN217769458U CN217769458U CN202220605497.XU CN202220605497U CN217769458U CN 217769458 U CN217769458 U CN 217769458U CN 202220605497 U CN202220605497 U CN 202220605497U CN 217769458 U CN217769458 U CN 217769458U
- Authority
- CN
- China
- Prior art keywords
- heating film
- diode
- electrically connected
- triode
- pin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model discloses a double protection circuit of parallelly connected electronic box of low pressure, including battery package, three-terminal fuse and BMS board, one utmost point of battery package is through the outside power supply of the fuse end of three-terminal fuse, and another utmost point is through the outside power supply of BMS board, the control end of three-terminal fuse is connected with the drive device pin of BMS board to the BMS board can drive the three-terminal fuse and break. It can be seen that it is through setting up the three-terminal fuse, is connected the three-terminal fuse with the inside drive device pin of BMS board to can realize the redundant protection of second grade under the condition that does not reform transform BMS board and also increase external circuit.
Description
Technical Field
The utility model relates to a protection circuit technical field, concretely relates to double protection circuit of parallelly connected electronic box of low pressure.
Background
The existing low-voltage parallel connection box fault protection circuit is generally provided with a software and hardware double protection circuit for ensuring the disconnection output under the fault condition, but the software and hardware protection circuit realizes the disconnection protection by depending on a MOSFET (metal oxide semiconductor field effect transistor) tube driving a BMS (battery management system) board, if the MOS tube hardware fails, the software can detect the fault but cannot disconnect the circuit protection, so that the parallel connection box still keeps the charge and discharge actions under the fault state of the MOS tube, and the risk of overcharge and overdischarge exists.
For this reason, the prior art drives the three-terminal fuse to open by adding a MOS transistor, but this solution requires modification of the hardware of the BMS board or adding an additional circuit outside the BMS, both of which result in high development costs.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: the double protection circuit of the low-voltage parallel electric box can realize the redundant protection of the low-voltage parallel electric box with low cost.
In order to solve the technical problem, the utility model discloses a technical scheme be: the utility model provides a double protection circuit of parallelly connected electronic box of low pressure, includes battery package, three-terminal fuse and BMS board, one utmost point of battery package is supplied power outward through the fuse end of three-terminal fuse, and another utmost point is supplied power outward through the BMS board, the control end of three-terminal fuse is connected with the drive device pin of BMS board to the BMS board can drive the three-terminal fuse and break.
Further, the control terminal of the three-terminal fuse is specifically connected with the pins of the heating film of the BMS board.
Further, the BMS board includes charge and discharge MOS pipe, MCU controller and AFE chip, and charge and discharge MOS pipe and AFE chip are connected to the MCU controller electricity, and battery package is connected to the AFE chip electricity, and the negative pole of battery package is through the outside power supply of charge and discharge MOS pipe.
Further, the heating film includes heating film drive circuit, the first pin of heating film and heating film second pin, the first pin of heating film is connected with the anodal electricity of battery package, heating film drive circuit includes first electric switch, second electric switch and heating film drive MOS pipe, the MCU controller electricity is connected first electric switch's control end, the anodal of battery package and second electric switch's control end are connected to first control switch's input electricity, and output electricity is connected ground, the anodal of battery package is connected to second electric switch's input electricity, and the grid of heating film drive MOS pipe is connected to output electricity, and heating film second pin is connected to the source electrode electricity of heating film drive MOS pipe, and the negative pole delivery outlet of outside power supply of drain electrode BMS electricity connection BMS board, the control end of three-terminal fuse specifically is the electricity and connects heating film second pin.
Further, the first electric switch is specifically a first triode, and the second electric switch is specifically a second triode.
Further, the heating film driving circuit further comprises a third triode, wherein the third triode is a PNP type triode, the base electrode and the emitting electrode of the third triode are electrically connected with the output end of the second triode, and the collecting electrode of the third triode is electrically connected with the negative electrode output port of the BMS board for supplying power to the outside.
Further, the heating film driving circuit further comprises a first diode, a second diode, a third diode, a fourth diode and a fifth diode, wherein the anode of the first diode is electrically connected with the anode of the battery pack, the cathode of the first diode is electrically connected with the input end of the first triode, the anode of the second diode is electrically connected with the output end of the second triode, the cathode of the second diode is electrically connected with the grid electrode of the heating film driving MOS tube, the anode of the third diode is electrically connected with the second pin of the heating film, the cathode of the third diode is electrically connected with the first pin of the heating film, the anode of the fourth diode is electrically connected with the base of the third triode, the cathode of the fourth diode is electrically connected with the emitter of the third triode, the anode of the fifth diode is electrically connected with the anode of the battery pack, and the cathode of the fifth diode is electrically connected with the first pin of the heating film.
The beneficial effects of the utility model reside in that: through setting up the three-terminal fuse, be connected the three-terminal fuse with the inside drive device pin of BMS board to can not reform transform BMS board and also not increase the realization secondary redundancy protection of low cost under the condition of external circuit.
Drawings
Fig. 1 is a schematic structural view of a low-voltage parallel electric box according to the present invention;
fig. 2 is a schematic structural view of a BMS board according to the present invention;
fig. 3 is a schematic structural diagram of a heating film driving circuit according to the present invention.
Detailed Description
In order to explain the technical contents, the objects and the effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Referring to fig. 1 to 3, a dual protection circuit of a low-voltage shunt power box includes a battery pack, a three-terminal fuse and a BMS board, one terminal of the battery pack is supplied with power through a fuse terminal of the three-terminal fuse, the other terminal of the battery pack is supplied with power through the BMS board, and a control terminal of the three-terminal fuse is connected to a driving device pin of the BMS board, so that the BMS board can drive the three-terminal fuse to be disconnected.
As can be seen from the above description, the utility model has the advantages that: through setting up the three-terminal fuse, be connected the three-terminal fuse with the inside drive device pin of BMS board to can realize the redundant protection of second grade under the condition that does not reform transform the BMS board and also not increase external circuit.
Further, the control terminal of the three-terminal fuse is specifically connected with the pin of the heating film of the BMS board.
As can be seen from the above description, the fuse driving of the three-terminal fuse is realized by using the pins of the heating film.
Further, the BMS board comprises a charge and discharge MOS tube, an MCU controller and an AFE chip, the MCU controller is electrically connected with the charge and discharge MOS tube and the AFE chip, the AFE chip is electrically connected with a battery pack, and the negative electrode of the battery pack supplies power to the outside through the charge and discharge MOS tube.
As can be seen from the above description, the collection of the battery pack state and the control of charging and discharging are realized.
Further, the heating film includes heating film drive circuit, the first pin of heating film and heating film second pin, the first pin of heating film is connected with the anodal electricity of battery package, heating film drive circuit includes first electric switch, second electric switch and heating film drive MOS pipe, the MCU controller electricity is connected first electric switch's control end, the anodal of battery package and second electric switch's control end are connected to first control switch's input electricity, and output electricity is connected ground, the anodal of battery package is connected to second electric switch's input electricity, and the grid of heating film drive MOS pipe is connected to output electricity, and heating film second pin is connected to the source electrode electricity of heating film drive MOS pipe, and the negative pole delivery outlet of outside power supply of drain electrode BMS electricity connection BMS board, the control end of three-terminal fuse specifically is the electricity and connects heating film second pin.
As can be seen from the above description, the driving of the heating film and the three-terminal fuse is realized.
Further, the first electric switch is specifically a first triode, and the second electric switch is specifically a second triode.
Further, the heating film driving circuit further comprises a third triode, wherein the third triode is a PNP type triode, the base electrode and the emitting electrode of the third triode are electrically connected with the output end of the second triode, and the collecting electrode of the third triode is electrically connected with the negative electrode output port of the BMS board for supplying power to the outside.
According to the above description, the signal of the heating film-driven MOS transistor can be turned on automatically after the control signal is stopped, so that the heating film-driven MOS transistor is turned off.
Further, the heating film driving circuit further comprises a first diode, a second diode, a third diode, a fourth diode and a fifth diode, wherein the anode of the first diode is electrically connected with the anode of the battery pack, the cathode of the first diode is electrically connected with the input end of the first triode, the anode of the second diode is electrically connected with the output end of the second triode, the cathode of the second diode is electrically connected with the grid electrode of the heating film driving MOS tube, the anode of the third diode is electrically connected with the second pin of the heating film, the cathode of the third diode is electrically connected with the first pin of the heating film, the anode of the fourth diode is electrically connected with the base of the third triode, the cathode of the fourth diode is electrically connected with the emitter of the third triode, the anode of the fifth diode is electrically connected with the anode of the battery pack, and the cathode of the fifth diode is electrically connected with the first pin of the heating film.
As can be seen from the above description, the diode functions to stabilize voltage and prevent current from flowing backward.
The utility model discloses a double protection circuit of parallelly connected electronic box of low pressure, it is used for providing double protection to the charge and discharge of the parallelly connected electronic box of low pressure, avoids the unable disconnection of the parallelly connected electronic box of low pressure and outside connection under the condition that MOS pipe became invalid.
Example one
Referring to fig. 1, the dual protection circuit of the low-voltage parallel connection electric box of the present embodiment includes a battery pack, a three-terminal fuse and a BMS board, wherein a positive terminal of the battery pack supplies power to an external device through a fuse terminal output of the three-terminal fuse, and a negative terminal of the battery pack supplies power to the external device through a BMS board output.
Referring to fig. 2, the BMS board structure includes an MCU controller, an AFE (analog front end, this refers to a battery sampling chip) chip and a charge and discharge MOS transistor, wherein the MCU controller is electrically connected to the charge and discharge MOS transistor and the AFE chip, the AFE chip is electrically connected to the battery pack to collect the state of each battery, and the negative electrode of the battery pack is connected to an external circuit via the charge and discharge MOS transistor to supply power to an external device.
Please refer to fig. 1, the utility model discloses a control pin with three-terminal fuse is connected with the pin of heating the membrane to fail at the charge-discharge MOS pipe, can't break off under the circumstances of group battery and external connection through control charge-discharge MOS pipe, can heat the membrane through the messenger, make the control end of three-terminal fuse electrified, so that the three-terminal fuse breaks off, and then control group battery disconnection and outside be connected.
Referring to fig. 3, the driving circuit of the heating film includes an enabling pin, i.e., an HT _ EN pin, the enabling pin is electrically connected to the MCU controller, and further includes a heating film body pin, a transistor Q1, a transistor Q2, a heating film driving MOS transistor Q3 and a transistor Q4, wherein the transistor Q1 is an NPN-type transistor, the transistor Q4 and the transistor Q2 are NPN-type transistors, the heating film body pin includes a pin No. 1 and a pin No. 2, the enabling pin is electrically connected to a base of the transistor Q1, a collector of the transistor Q1 is electrically connected to an anode of the battery pack and a base of the transistor Q2, an emitter of the transistor Q2 is electrically connected to ground, an emitter of the battery pack is electrically connected to a positive electrode of the battery pack, a collector of the transistor is electrically connected to a gate of the heating film driving MOS transistor Q3, a source of the heating film driving MOS transistor Q3 is electrically connected to the pin No. 2, and a drain of the transistor is electrically connected to a negative output port of the BMS board for supplying power to the outside.
And the base electrode and the emitting electrode of the triode Q4 are electrically connected with the output end of the triode Q2, and the collecting electrode is electrically connected with the negative electrode output port of the BMS board for supplying power to the outside.
In an optional embodiment, the heating film driving circuit further includes a diode D1, a diode D2, a diode D3, a diode D4, and a diode D5, an anode of the diode D1 is electrically connected to the positive electrode of the battery pack, a cathode of the diode D1 is electrically connected to the collector of the transistor Q1, an anode of the diode S2 is electrically connected to the collector of the transistor Q2, a cathode of the diode D2 is electrically connected to the gate of the heating film driving MOS transistor, an anode of the third diode is electrically connected to the second pin of the heating film, a cathode of the third diode is electrically connected to the first pin of the heating film, an anode of the fourth diode is electrically connected to the base of the third transistor, a cathode of the fourth diode is electrically connected to the emitter of the third transistor, an anode of the fifth diode is electrically connected to the positive electrode of the battery pack, and a cathode of the fifth diode is electrically connected to the first pin of the heating film.
Under normal state, the No. 2 pin keeps an open circuit state, when the MCU detects that the charging and discharging MOS tube fails, the enable pin of the driving circuit of the heating film is enabled, so that the heating film is electrified, and the three-terminal fuse is driven by voltage of 48V to be disconnected.
To sum up, the utility model provides a through setting up the three-terminal fuse, be connected the three-terminal fuse with the inside drive device pin of BMS inboard to can realize the redundant protection of second grade under the condition that does not reform transform the BMS board and also not increase external circuit.
The above mentioned is only the embodiment of the present invention, and not the limitation of the patent scope of the present invention, all the equivalent transformations made by the contents of the specification and the drawings, or the direct or indirect application in the related technical field, are included in the patent protection scope of the present invention.
Claims (7)
1. The utility model provides a double protection circuit of low pressure parallel connection electronic box which characterized in that: including battery package, three-terminal fuse and BMS board, one utmost point of battery package is through the outside power supply of the fuse end of three-terminal fuse, and another utmost point is through the outside power supply of BMS board, the control end of three-terminal fuse is connected with the drive device pin of BMS board to the BMS board can drive three-terminal fuse and break.
2. The dual protection circuit of low-voltage parallel box according to claim 1, characterized in that: the control terminal of the three-terminal fuse is specifically connected with a pin of a heating film of the BMS board.
3. The low-voltage shunt box double protection circuit of claim 2, which is characterized in that: BMS board is including charge and discharge MOS pipe, MCU controller and AFE chip, and charge and discharge MOS pipe and AFE chip are connected to the MCU controller electricity, and battery package is connected to the AFE chip electricity, and the negative pole of battery package is through the charge and discharge MOS pipe outwards power supply.
4. The dual protection circuit of low-voltage parallel box according to claim 3, characterized in that: the heating film includes heating film drive circuit, the first pin of heating film and heating film second pin, the first pin of heating film is connected with the positive pole electricity of battery package, heating film drive circuit includes first electric switch, second electric switch and heating film drive MOS pipe, the MCU controller electricity is connected first electric switch's control end, the anodal of battery package and second electric switch's control end are connected to first electric switch's input electricity, and output electricity is connected ground, the anodal of battery package is connected to second electric switch's input electricity, and the grid of heating film drive MOS pipe is connected to output electricity, and the heating film second pin is connected to the source electricity of heating film drive MOS pipe, and the negative pole delivery outlet of BMS board outside power supply is connected to the drain electrode electricity, the control end of three-terminal fuse specifically is the electricity and connects heating film second pin.
5. The dual protection circuit of low-voltage parallel box according to claim 4, characterized in that: the first electric switch is specifically a first triode, and the second electric switch is specifically a second triode.
6. The dual protection circuit of low-voltage parallel box according to claim 5, characterized in that: the heating film driving circuit further comprises a third triode, the third triode is a PNP type triode, the base and the emitting electrode of the third triode are electrically connected with the output end of the second triode, and the collecting electrode of the third triode is electrically connected with the negative electrode output port of the BMS board for supplying power outwards.
7. The dual protection circuit of claim 6, wherein: the heating film driving circuit further comprises a first diode, a second diode, a third diode, a fourth diode and a fifth diode, wherein the anode of the first diode is electrically connected with the anode of the battery pack, the cathode of the first diode is electrically connected with the input end of the first triode, the anode of the second diode is electrically connected with the output end of the second triode, the cathode of the second diode is electrically connected with the grid of the heating film driving MOS tube, the anode of the third diode is electrically connected with the second pin of the heating film, the cathode of the third diode is electrically connected with the first pin of the heating film, the anode of the fourth diode is electrically connected with the base of the third triode, the cathode of the fourth diode is electrically connected with the emitter of the third triode, the anode of the fifth diode is electrically connected with the anode of the battery pack, and the cathode of the fifth diode is electrically connected with the first pin of the heating film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220605497.XU CN217769458U (en) | 2022-03-18 | 2022-03-18 | Double protection circuit of low-voltage parallel electric box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220605497.XU CN217769458U (en) | 2022-03-18 | 2022-03-18 | Double protection circuit of low-voltage parallel electric box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217769458U true CN217769458U (en) | 2022-11-08 |
Family
ID=83882359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220605497.XU Active CN217769458U (en) | 2022-03-18 | 2022-03-18 | Double protection circuit of low-voltage parallel electric box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217769458U (en) |
-
2022
- 2022-03-18 CN CN202220605497.XU patent/CN217769458U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101136558B (en) | Power supply system and switch circuit, switch method of main power source and backup battery | |
| CN110729784B (en) | Battery management system integrating high-side switch and MOS tube control power supply AC/DC switching | |
| CN111313374A (en) | Battery system under-voltage protection circuit and method applied to electric bicycle BMS | |
| CN212343375U (en) | Novel BMS accuse negative pole charge-discharge drive control circuit | |
| CN217769458U (en) | Double protection circuit of low-voltage parallel electric box | |
| CN102684294A (en) | Main and standby power supply control device for embedded equipment | |
| CN206401879U (en) | Input undervoltage protection circuit for DC DC | |
| CN210577924U (en) | Charging circuit based on solar charging and system thereof | |
| CN114006433A (en) | Battery device | |
| CN220673418U (en) | Battery unit protection circuit and battery package management circuit | |
| CN219351310U (en) | Energy storage power supply system | |
| CN110854953A (en) | Battery charging and discharging protection circuit and battery device | |
| TW407390B (en) | Battery charging circuit and pack battery | |
| CN214154004U (en) | Lithium battery secondary overvoltage overcharge-prevention protection device | |
| CN216872903U (en) | Direct current and lithium battery charging switching circuit and lithium battery pack | |
| CN209657255U (en) | Embedded system device for protecting power supply circuit | |
| CN212435364U (en) | System power supply device of photovoltaic inverter and photovoltaic inverter | |
| CN215343958U (en) | Output control's power battery protection circuit | |
| CN216981580U (en) | Lithium battery electricity supplementing circuit | |
| CN213027530U (en) | Dual-power supply circuit and dual-power supply device | |
| CN220172888U (en) | Over-discharge protection circuit of lead-acid battery | |
| CN103917003A (en) | Emergency lamp and emergency lamp control circuit | |
| CN214506641U (en) | Dual-power switching circuit and power supply device | |
| CN212695973U (en) | Power supply circuit and power supply device | |
| CN217788550U (en) | Battery heating film control system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |