CN219875155U - Power supply circuit of battery management system - Google Patents
Power supply circuit of battery management system Download PDFInfo
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- CN219875155U CN219875155U CN202321090038.3U CN202321090038U CN219875155U CN 219875155 U CN219875155 U CN 219875155U CN 202321090038 U CN202321090038 U CN 202321090038U CN 219875155 U CN219875155 U CN 219875155U
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- 238000010521 absorption reaction Methods 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 8
- 230000005611 electricity Effects 0.000 description 2
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Abstract
The utility model provides a power supply circuit of a battery management system, which comprises a high-voltage power supply module, a transformer and a low-voltage power supply module, wherein the output end of the high-voltage power supply module is connected with the primary side of the transformer, and the secondary side of the transformer is connected with the input end of the low-voltage power supply module; the output end of the low-voltage power supply module is connected with the battery management system. The utility model supplies power to the battery management system through the high-voltage battery pack, and ensures the power supply stability while realizing uninterrupted operation of the battery management system.
Description
Technical Field
The present utility model relates to the field of battery management systems, and in particular, to a power supply circuit of a battery management system.
Background
The core part of the battery management system of the current electric automobile is a power supply module, the normal operation of each module can be ensured by isolating power supply, and the working voltage of the power supply module is provided by an external 12V small storage battery or a vehicle-mounted DC/DC power supply.
On the one hand, if BMS (Battery Management System ) uses on-vehicle DC/DC power as power supply, when the vehicle is in the circumstances of the state of turning off electricity, on-vehicle DC/DC power does not work, and the vehicle is in the dormant state, and BMS is in the state of losing electricity, leads to BMS unable control management to carry out real-time full function to the electric core in the battery package, on the other hand, if BMS uses little storage battery as power supply, in case little storage battery has breaks down and just unable stable output voltage carries out stable power supply for BMS continuously, finally also can lead to BMS unable normal work, thereby cause serious influence to car security performance.
Disclosure of Invention
Therefore, the utility model aims to provide a power supply circuit of a battery management system, which supplies power to the battery management system through a high-voltage battery pack, so that uninterrupted operation of the battery management system is realized, and meanwhile, the power supply stability is ensured.
The embodiment of the utility model provides a power supply circuit of a battery management system, which comprises a high-voltage power supply module, a transformer and a low-voltage power supply module, wherein the output end of the high-voltage power supply module is connected with the primary side of the transformer, and the secondary side of the transformer is connected with the input end of the low-voltage power supply module; the output end of the low-voltage power supply module is connected with the battery management system.
In one possible embodiment, the high-voltage power supply module comprises a battery pack and a high-voltage filter module, wherein the positive electrode of the battery pack is connected with the input end of the high-voltage filter module, the output end of the high-voltage filter module is connected with one end of the primary side of the transformer, and the other end of the primary side of the transformer is grounded.
In one possible implementation manner, the high-voltage filter module comprises a first resistor, a first capacitor and a second capacitor, wherein one end of the first resistor is used as an input end of the high-voltage filter module and is respectively connected with the positive electrode of the battery pack and one end of the first capacitor, and the other end of the first resistor is used as an output end of the high-voltage filter module and is respectively connected with one end of the primary side of the transformer and one end of the second capacitor; the other end of the first capacitor is connected with the other end of the second capacitor and then grounded.
In one possible implementation manner, the high-voltage power supply module further comprises a power supply control chip, a control chip peripheral circuit, a control switch, a follow current module and an energy absorption circuit, wherein the input end of the control chip peripheral circuit is connected with the output end of the high-voltage filter module, the output end of the control chip peripheral circuit is connected with the input end of the power supply control chip, and the output end of the power supply control module is connected with the first connecting end of the control switch; the second connecting end of the control switch is grounded, the third connecting end of the control switch is respectively connected with the input end of the follow current module, the other end of the primary side of the transformer and the input end of the energy absorption circuit, the output end of the follow current module is connected with one end of the primary side of the transformer, and the output end of the energy absorption circuit is connected with the second connecting end of the control switch.
In one possible implementation manner, the control chip peripheral circuit comprises a second resistor, a third resistor, a fourth resistor, a fifth resistor and a third capacitor, wherein one end of the second resistor and one end of the third resistor are respectively connected with the other end of the first resistor in the high-voltage filtering module, the other end of the second resistor is connected with one end of the fourth resistor, and the other end of the fourth resistor is connected with the first input end of the power supply control chip; the other end of the third resistor is connected with one end of a fifth resistor, the other end of the fifth resistor is connected with the second input end of the power supply control chip, the output end of the power supply control chip is connected with one end of a third capacitor, and the other end of the third capacitor is connected with the first connecting end of the control switch.
In one possible embodiment, the freewheel module includes a sixth resistor, a fourth capacitor and a first diode, wherein the positive pole of the first diode is connected to the third connection terminal of the control switch, and the negative pole of the first diode is connected to one end of the sixth resistor and one end of the fourth capacitor, respectively; the other end of the sixth resistor and the other end of the fourth capacitor are respectively connected with one end of the primary side of the transformer.
In one possible implementation manner, the energy absorption circuit comprises an eighth resistor and a fifth capacitor, the high-voltage power supply module further comprises a seventh resistor, one end of the eighth resistor is connected with the third connecting end of the control switch, the other end of the eighth resistor is connected with one end of the fifth capacitor, and the other end of the fifth capacitor is connected with the second connecting end of the control switch; one end of the seventh resistor is connected with the second connecting end of the control switch, and the other end of the seventh resistor is grounded.
In one possible implementation manner, the low-voltage power supply module comprises a low-voltage filter module and a voltage division module, wherein an input end of the low-voltage filter module is connected with one end of a secondary side of the transformer, an output end of the low-voltage filter module is connected with an input end of the voltage division module, an output end of the voltage division module is connected with the battery management system, and the other end of the secondary side of the transformer is grounded.
In one possible embodiment, the low-voltage filtering module includes a ninth resistor, a sixth capacitor and a second diode, wherein one end of the ninth resistor is connected to the positive electrode of the second diode and one end of the secondary side of the transformer, and the other end of the ninth resistor is connected to one end of the sixth capacitor, and the other end of the sixth capacitor is connected to the negative electrode of the second diode and the input end of the voltage dividing module, respectively.
In one possible implementation manner, the voltage dividing module comprises a tenth resistor, an eleventh resistor, a twelfth resistor, a seventh capacitor, an eighth capacitor and a ninth capacitor, wherein one end of the tenth resistor, one end of the seventh capacitor and one end of the eighth capacitor are respectively connected with the cathode of the second diode, the other end of the tenth resistor is respectively connected with one end of the eleventh resistor and one end of the twelfth resistor, and the other end of the eleventh resistor is used as an output end of the low-voltage power supply module and is respectively connected with one ends of the battery management system and the ninth capacitor; the other end of the twelfth resistor, the other end of the seventh capacitor, the other end of the eighth capacitor and the other end of the ninth capacitor are respectively connected with the other end of the secondary side of the transformer and grounded.
The utility model provides a power supply circuit of a battery management system, which comprises a high-voltage power supply module, a transformer and a low-voltage power supply module, wherein the output end of the high-voltage power supply module is connected with the primary side of the transformer, and the secondary side of the transformer is connected with the input end of the low-voltage power supply module; the output end of the low-voltage power supply module is connected with the battery management system. The utility model supplies power to the battery management system through the high-voltage battery pack, and ensures the power supply stability while realizing uninterrupted operation of the battery management system.
In order to make the above objects, features and advantages of the present utility model more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a power supply circuit of a battery management system according to an embodiment of the present utility model;
fig. 2 shows a second schematic structural diagram of a power supply circuit of a battery management system according to an embodiment of the present utility model;
fig. 3 shows a schematic diagram of a power supply circuit of a battery management system according to an embodiment of the present utility model;
fig. 4 is a schematic diagram showing a power supply circuit of a battery management system according to an embodiment of the present utility model.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model, and it should be understood that the drawings in the present utility model are for the purpose of illustration and description only and are not intended to limit the scope of the present utility model. In addition, it should be understood that the schematic drawings are not drawn to scale.
In addition, the described embodiments are only some, but not all, embodiments of the utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the utility model, as 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 made by a person skilled in the art based on embodiments of the utility model without making any inventive effort, fall within the scope of the utility model.
Because BMS's power supply source is 12V little storage battery or on-vehicle DC/DC power supply and provides, is in the state of turning off when the vehicle, and on-vehicle DC/DC power does not work, and the vehicle is in the dormant state, and BMS can't carry out real-time full-function's control management to the electric core, in addition, if 12V little storage battery has failed and can't stabilize output 12V voltage, then BMS just also can't normally work, leads to causing serious influence to car security performance.
Based on this, the embodiment of the utility model provides a power supply circuit of a battery management system, which supplies power to the battery management system through a high-voltage battery pack, and ensures the power supply stability while realizing uninterrupted operation of the battery management system, and specifically comprises the following steps:
referring to fig. 1, fig. 1 is a schematic diagram illustrating a power supply circuit of a battery management system according to an embodiment of the utility model. As shown in fig. 1, a power supply circuit of a battery management system according to an embodiment of the present utility model includes a high-voltage power supply module 1, a transformer 2, and a low-voltage power supply module 3.
The output end of the high-voltage power supply 1 is connected with the primary side of the transformer 2, the secondary side of the transformer 2 is connected with the input end of the low-voltage power supply module 3, and the output end of the low-voltage power supply module 3 is connected with the battery management system BMS.
Referring to fig. 2, fig. 2 shows a second schematic diagram of a power supply circuit of a battery management system according to an embodiment of the utility model. As shown in fig. 2, the high-voltage power supply module 1 includes a battery pack (not shown in the figure) and a high-voltage filter module 10, wherein the high-voltage filter module is a CLC filter circuit.
In a preferred embodiment, the positive electrode bat+ of the battery pack is connected to the input end of the high voltage filter module 10, the output end of the high voltage filter module 10 is connected to one end of the primary side of the transformer 2, and the other end of the primary side of the transformer 2 is grounded, wherein the voltage range that the battery pack can input is 300V-1200V.
In another preferred embodiment, as shown in fig. 2, the low voltage power supply module 3 includes a low voltage filtering module 31 and a voltage dividing module 32, wherein an input end of the low voltage filtering module 31 is connected with a secondary side of the transformer 2, an output end of the low voltage filtering module 31 is connected with an input end of the voltage dividing module 32, and an output end of the voltage dividing module 32 is connected with the battery management system BMS.
Referring to fig. 3, fig. 3 shows a schematic diagram of a power supply circuit of a battery management system according to an embodiment of the utility model. As shown in fig. 3, the high-voltage power supply module 1 further includes a power supply control chip 11, a control chip peripheral circuit 12, a control switch K, a freewheel module 13, and an energy absorbing circuit 14.
The input end of the control chip peripheral circuit 12 is connected with the output end of the high-voltage filtering module 10, the output end of the control chip peripheral circuit 12 is connected with the input end of the power supply control chip 11, the output end of the power supply control chip 11 is connected with the first connecting end of the control switch K, the second connecting end of the control switch K is grounded, the third connecting end of the control switch K is respectively connected with the input end of the follow current module 13, the other end of the primary side of the transformer 2 and the input end of the energy absorption circuit 14, the output end of the follow current module 13 is connected with one end of the primary side of the transformer 2, and the output end of the energy absorption circuit 14 is connected with the second connecting end of the control switch K.
Referring to fig. 4, fig. 4 is a schematic diagram illustrating a power supply circuit of a battery management system according to an embodiment of the utility model. As shown in fig. 4, the high-voltage filter module 10 includes a first resistor R1, a first capacitor C1, and a second capacitor C2.
Preferably, one end of the first resistor C1 is connected to the positive electrode bat+ of the battery pack and one end of the first capacitor C1 as an input end of the high-voltage filter module 10, and the other end of the first resistor R1 is connected to one end of the second capacitor C2 as an output end of the high-voltage filter module 10, and the other end of the first capacitor C1 and the other end of the second capacitor C2 are connected to ground.
The control chip peripheral circuit 12 includes a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a third capacitor C3.
Preferably, one end of the second resistor R2 and the third resistor R3 are respectively connected with the other end of the first resistor R1 in the high-voltage filter module 10, the other end of the second resistor R2 is connected with one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected with the first input BO of the power supply control chip 11, the other end of the third resistor R3 is connected with one end of the fifth resistor R5, the other end of the fifth resistor R5 is connected with the second input VCC of the power supply control chip 11, the output Dr of the power supply control chip 11 is connected with one end of the third capacitor C3, and the other end of the third capacitor C3 is connected with the first connection end of the control switch K.
Specifically, the first input BO of the power supply control chip 11 inputs the reference voltage of the power supply control chip 11, the second input VCC of the power supply control chip 11 inputs the power supply voltage of the power supply control chip 11, the power supply control chip 11 is a PWM generating chip, and can output a PWM signal to control on and off of the control switch K, which is a MOS switch.
The freewheel module 13 includes a sixth resistor R6, a fourth capacitor C4, and a first diode D1, where an anode of the first diode D1 is connected to a third connection end of the control switch K, a cathode of the first diode D1 is connected to one end of the sixth resistor R6 and one end of the fourth capacitor C4, and another end of the sixth resistor R6 and another end of the fourth capacitor C4 are connected to one end of a primary side of the transformer 2.
As shown in fig. 4, the high-voltage power supply module 1 further includes a seventh resistor R7, the energy absorbing circuit 14 includes an eighth resistor R8 and a fifth capacitor C5, where one end of the eighth resistor R8 is connected to the third connection end of the control switch K, the other end of the eighth resistor R8 is connected to one end of the fifth capacitor C5, the other end of the fifth capacitor C5 is connected to the second connection end of the control switch K, one end of the seventh resistor R7 is connected to the second connection end of the control switch K, and the other end of the seventh resistor R7 is grounded.
In the utility model, the energy absorbing circuit 14 connected in parallel with the resistance-capacitance filter can play the following roles: firstly, the noise of the EMCC can be reduced, the overall performance of the circuit is improved, and secondly, the stability of the secondary side output voltage of the transformer 2 can be ensured.
The low-voltage filtering module 31 includes a ninth resistor R9, a sixth capacitor C6, and a second diode D2, where one end of the ninth resistor R9 is connected to the positive electrode of the second diode D2 and one end of the secondary side of the transformer 2, and the other end of the ninth resistor R9 is connected to one end of the sixth capacitor C6, and the other end of the sixth capacitor C6 is connected to the negative electrode of the second diode D2 and the input end of the voltage dividing module 32.
Specifically, the voltage dividing module 32 includes a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a seventh capacitor C7, an eighth capacitor C8, and a ninth capacitor C9.
As shown in fig. 4, one end of the tenth resistor R10, one end of the seventh capacitor C7, and one end of the eighth capacitor C8 are respectively connected to the negative electrode of the second diode D2, the other end of the tenth resistor R10 is respectively connected to one end of the eleventh resistor R11 and one end of the twelfth resistor R12, the other end of the eleventh resistor R11 is respectively connected to one end of the battery management system BMS and one end of the ninth capacitor C9 as the output end of the low-voltage power supply module 3, and the other end of the twelfth resistor R12, the other end of the seventh capacitor C7, the other end of the eighth capacitor C8, and the other end of the ninth capacitor C9 are respectively connected to the other end of the secondary side of the transformer 2 and grounded.
In a specific embodiment, as shown in fig. 4, in the power supply circuit of the battery management system of the present utility model, the control switch K is an NMOS switch, and is turned on at a high level, when the voltage of the battery pack satisfies the reference voltage of the first input BO and the power supply voltage of the second input VCC of the power supply control chip 11, which indicates that the electric quantity of the battery pack is sufficient, the output Dr of the power supply control chip 11 continuously outputs a high level to the first connection terminal of the control switch K, so that the control switch K is in a continuous on state, and at this time, the voltage of the battery pack is released to the low voltage power supply module through the primary side and the secondary side of the transformer 2, and is supplied to the battery management system BMS through the voltage division of the tenth resistor R10, the eleventh resistor R11 and the twelfth resistor R12, so that the BMS is in a normal working state.
When the reference voltage of the first input terminal BO and/or the supply voltage of the second input terminal VCC of the battery pack do not meet the requirement of the power supply control chip 11, the power shortage of the battery pack is indicated at this time, the output terminal Dr of the power supply control chip 11 continuously outputs a low level to the first connection terminal of the control switch K, so that the control switch K is in a continuously off state, at this time, the voltage output by the battery pack directly passes through the control switch K to the ground through the freewheel circuit, no voltage is generated by the full-stimulus coil of the transformer 2, at this time, the battery pack stops supplying power to the battery management system BMS, so as to reduce the power loss of the battery pack.
In the utility model, the desired voltage and current can be output by adjusting the turns ratio of the primary side coil and the secondary side coil of the transformer.
According to the power supply circuit, the battery pack supplies power to the BMS, and even if the external small storage battery is disconnected and unstable or the vehicle-mounted DC/DC power supply is powered down, the BMS can normally work under the action of the power supply circuit, so that the power supply stability of the BMS is ensured, and the safety coefficient of the circuit is improved.
The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any person skilled in the art will readily appreciate variations or alternatives within the scope of the present utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.
Claims (10)
1. A power supply circuit of a battery management system is characterized in that the power supply circuit of the battery management system comprises a high-voltage power supply module, a transformer and a low-voltage power supply module,
the output end of the high-voltage power supply module is connected with the primary side of the transformer, and the secondary side of the transformer is connected with the input end of the low-voltage power supply module;
and the output end of the low-voltage power supply module is connected with the battery management system.
2. The power supply circuit of claim 1, wherein the high voltage power supply module comprises a battery pack and a high voltage filter module,
the positive electrode of the battery pack is connected with the input end of the high-voltage filter module, the output end of the high-voltage filter module is connected with one end of the primary side of the transformer, and the other end of the primary side of the transformer is grounded.
3. The power supply circuit of a battery management system of claim 2 wherein the high voltage filter module comprises a first resistor, a first capacitor and a second capacitor,
one end of the first resistor is used as an input end of the high-voltage filter module and is respectively connected with the anode of the battery pack and one end of the first capacitor, and the other end of the first resistor is used as an output end of the high-voltage filter module and is respectively connected with one end of the primary side of the transformer and one end of the second capacitor;
the other end of the first capacitor is connected with the other end of the second capacitor and then grounded.
4. The power supply circuit of the battery management system of claim 2 wherein the high voltage power module further comprises a power supply control chip, a control chip peripheral circuit, a control switch, a freewheel module and an energy absorbing circuit,
the input end of the control chip peripheral circuit is connected with the output end of the high-voltage filtering module, the output end of the control chip peripheral circuit is connected with the input end of the power supply control chip, and the output end of the power supply control chip is connected with the first connecting end of the control switch;
the second connecting end of the control switch is grounded, the third connecting end of the control switch is respectively connected with the input end of the follow current module, the other end of the primary side of the transformer and the input end of the energy absorption circuit, the output end of the follow current module is connected with one end of the primary side of the transformer, and the output end of the energy absorption circuit is connected with the second connecting end of the control switch.
5. The power supply circuit of the battery management system of claim 4, wherein the control chip peripheral circuit comprises a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a third capacitor,
one end of the second resistor and the third resistor are respectively connected with the other end of the first resistor in the high-voltage filtering module, the other end of the second resistor is connected with one end of the fourth resistor, and the other end of the fourth resistor is connected with the first input end of the power supply control chip;
the other end of the third resistor is connected with one end of the fifth resistor, the other end of the fifth resistor is connected with the second input end of the power supply control chip, the output end of the power supply control chip is connected with one end of the third capacitor, and the other end of the third capacitor is connected with the first connecting end of the control switch.
6. The power supply circuit of a battery management system as recited in claim 4, wherein the freewheel module includes a sixth resistor, a fourth capacitor and a first diode,
the positive electrode of the first diode is connected with the third connecting end of the control switch, and the negative electrode of the first diode is respectively connected with one end of the sixth resistor and one end of the fourth capacitor;
the other end of the sixth resistor and the other end of the fourth capacitor are respectively connected with one end of the primary side of the transformer.
7. The power circuit of claim 4, wherein the energy absorbing circuit comprises an eighth resistor and a fifth capacitor, the high voltage power module further comprises a seventh resistor,
one end of the eighth resistor is connected with the third connecting end of the control switch, the other end of the eighth resistor is connected with one end of the fifth capacitor, and the other end of the fifth capacitor is connected with the second connecting end of the control switch;
one end of the seventh resistor is connected with the second connecting end of the control switch, and the other end of the seventh resistor is grounded.
8. The power supply circuit of claim 1, wherein the low voltage power supply module comprises a low voltage filter module and a voltage divider module,
the input end of the low-voltage filtering module is connected with one end of the secondary side of the transformer, the output end of the low-voltage filtering module is connected with the input end of the voltage dividing module, the output end of the voltage dividing module is connected with the battery management system, and the other end of the secondary side of the transformer is grounded.
9. The power supply circuit of the battery management system of claim 8 wherein the low voltage filter module comprises a ninth resistor, a sixth capacitor and a second diode,
one end of the ninth resistor is connected with the anode of the second diode and one end of the secondary side of the transformer respectively, the other end of the ninth resistor is connected with one end of the sixth capacitor, and the other end of the sixth capacitor is connected with the cathode of the second diode and the input end of the voltage dividing module respectively.
10. The power supply circuit of the battery management system of claim 9 wherein the voltage dividing module comprises a tenth resistor, an eleventh resistor, a twelfth resistor, a seventh capacitor, an eighth capacitor, and a ninth capacitor,
one end of the tenth resistor, one end of the seventh capacitor and one end of the eighth capacitor are respectively connected with the cathode of the second diode, the other end of the tenth resistor is respectively connected with one end of the eleventh resistor and one end of the twelfth resistor, and the other end of the eleventh resistor is used as an output end of the low-voltage power supply module and is respectively connected with one ends of the battery management system and the ninth capacitor;
the other end of the twelfth resistor, the other end of the seventh capacitor, the other end of the eighth capacitor and the other end of the ninth capacitor are respectively connected with the other end of the secondary side of the transformer and grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321090038.3U CN219875155U (en) | 2023-05-08 | 2023-05-08 | Power supply circuit of battery management system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321090038.3U CN219875155U (en) | 2023-05-08 | 2023-05-08 | Power supply circuit of battery management system |
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| CN219875155U true CN219875155U (en) | 2023-10-20 |
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| CN202321090038.3U Active CN219875155U (en) | 2023-05-08 | 2023-05-08 | Power supply circuit of battery management system |
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