CN205283392U - Battery management system supply circuit - Google Patents
Battery management system supply circuit Download PDFInfo
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- CN205283392U CN205283392U CN201521108235.9U CN201521108235U CN205283392U CN 205283392 U CN205283392 U CN 205283392U CN 201521108235 U CN201521108235 U CN 201521108235U CN 205283392 U CN205283392 U CN 205283392U
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Abstract
The utility model relates to a battery management system supply circuit, including BOOST step up unit and BUCK voltage reduction unit, the input termination battery positive output that BOOST stepped up the unit holds, exports termination BUCK voltage reduction unit's input, BUCK voltage reduction unit's output termination battery management system's power input end. Step up the unit to the battery output voltage back of stepping up through BOOST, rethread BUCK voltage reduction unit will for stable 5V voltage for battery management system power supply, ensure that battery management system also can in time start and normally work when battery voltage is less than 5V, improvement electric automobile's performance.
Description
Technical field
This utility model relates to battery management system technical field, is specifically related to a kind of battery management system power supply circuits.
Background technology
The power supply of the battery management system (BMS) of existing electric automobile mainly by lead-acid accumulator or other independent of outside electrokinetic cell battery provide. Owing to this battery provides the vehicular equipment such as vehicle mounted electrical apparatus, instrument to power simultaneously, when automobile starting, cell degradation or other vehicle mounted electrical apparatus or instrument fault, cell voltage will be likely to result in reduce, and cause battery management system (BMS) can not start in time or cisco unity malfunction because of under-voltage. Thus result in battery management system cannot in time, effectively to ECU provide electrokinetic cell battery information, affect the performance of electric automobile.
Utility model content
The purpose of this utility model is to overcome shortcomings and deficiencies of the prior art, it is provided that a kind of battery management system power supply circuits, it is ensured that also can normal operation when the power supply of battery management system is under-voltage.
The purpose of this utility model is achieved through the following technical solutions:
A kind of battery management system power supply circuits, including BOOST boosting unit and BUCK pressure unit, the input termination anode outfan of described BOOST boosting unit, the input of output termination BUCK pressure unit; The power input of the output termination battery management system of described BUCK pressure unit.
As preferably, also including the diode D1 being connected between battery and BOOST boosting unit, the positive pole of described diode D1 connects anode outfan, and negative pole connects BOOST boosting unit input.
As preferably, also including voltage sampling unit, described voltage sampling unit includes resistance R1 and resistance R2, resistance R1 one end and is connected with the cathode output end of battery, ground connection after other end series resistance R2, the node of resistance R1 and resistance R2 is connected to the control centre of battery management system.
As preferably, described BOOST boosting unit includes: output input capacitance C1, input capacitance C3, inductance L1, the first switching tube, second switch pipe and BOOST controller U1, one end of described input capacitance C3 is connected with one end of anode outfan and inductance L1 respectively, other end ground connection; The other end of inductance L1 connects the input of the first switching tube and the input of second switch pipe respectively; The end that controls of the first switching tube is connected with the low tension switch pin of BOOST controller, output head grounding; The end that controls of second switch pipe is connected with the high-voltage switch gear pin of BOOST controller, and output terminates the one end exporting input capacitance C1, simultaneously as the input of the outfan of BOOST boosting unit and BUCK pressure unit; The other end ground connection of output input capacitance C1.
As preferably, described first switching tube is any one in diode, audion, metal-oxide-semiconductor.
As preferably, described second switch pipe is audion or metal-oxide-semiconductor.
As preferably, described BUCK pressure unit includes: output input capacitance C1, output capacitance C2, inductance L2, the 3rd switching tube, the 4th switching tube and BUCK controller, and one end of described output input capacitance C1 is connected with the input of the 3rd switching tube; The end that controls of the 3rd switching tube is connected with the high-voltage switch gear pin of BUCK controller, and outfan is connected with the input of the 4th switch pin and one end of inductance L2 respectively; The high-voltage switch gear pin of BUCK controller and the control pin of the 4th switching tube connect; The output head grounding of the 4th switch pin; One end of another termination output capacitance C2 of inductance L2, and as the outfan of BUCK pressure unit, the other end ground connection of output capacitance C2.
As preferably, described 3rd switching tube is audion or metal-oxide-semiconductor.
As preferably, described 4th switching tube is any one in diode, audion, metal-oxide-semiconductor.
As preferably, described BOOST boosting unit adopts synchronous rectification or asynchronous rectification.
As preferably, described BUCK pressure unit adopts synchronous rectification or asynchronous rectification.
As preferably, described BOOST controller and BUCK controller are integrated BOOST+BUCK controller.
This utility model includes advantages below and beneficial effect compared to existing technology:
(1) after the output voltage of battery is boosted by this utility model by BOOST boosting unit, to be that battery management system is powered for stable 5V voltage again through BUCK pressure unit, guarantee that battery management system also can start and normal operation in time when cell voltage is lower than 12V, improves the performance of electric automobile.
(2) detected the voltage status of battery by voltage sampling unit in real time, and the voltage status of battery is input to battery management system is monitored.
(3) by isolating diode D1, cell output voltage is isolated, improve the stability of power supply circuits.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams in embodiment.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, this utility model is described in further detail, but embodiment of the present utility model is not limited to this.
Embodiment
As it is shown in figure 1, a kind of battery management system power supply circuits, including BOOST boosting unit, BUCK pressure unit, diode D1 and voltage sampling unit. Described BOOST boosting unit includes: electric capacity C1, electric capacity C3, inductance L1, the first switching tube, second switch pipe and BOOST controller U1. Described BUCK pressure unit includes: electric capacity C1, electric capacity C2, inductance L2, the 3rd switching tube, the 4th switching tube and BUCK controller. Described first switching tube, the 4th switching tube can be all any one in diode, audion, metal-oxide-semiconductor; Described second switch pipe, the 3rd switching tube can be all audion or metal-oxide-semiconductor. In the present embodiment, described first switching tube, second switch pipe, the 3rd switching tube, the 4th switching tube are metal-oxide-semiconductor, respectively metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q4.
The described positive pole of diode D1 is connected with the electrode input end of battery, and negative pole connects one end of input capacitance C3 and one end of inductance L1 respectively; The other end ground connection of described input capacitance C3; The described inductance L1 other end connects the drain electrode of metal-oxide-semiconductor Q1 and the source electrode of metal-oxide-semiconductor Q2, the source ground of metal-oxide-semiconductor Q1 respectively, and grid connects the low tension switch pin of BOOST controller; The grid of described metal-oxide-semiconductor Q2 connects the high-voltage switch gear pin of BOOST controller, and drain electrode connects one end of output input capacitance C1, simultaneously as the input of the outfan of BOOST boosting unit and BUCK pressure unit; The other end ground connection of output input capacitance C1; The drain electrode of the second metal-oxide-semiconductor Q2 is also connected with the drain electrode of the input of BOOST boosting unit and the 3rd metal-oxide-semiconductor Q3; The grid of the 3rd metal-oxide-semiconductor Q3 is connected with the high-voltage switch gear pin of BUCK, and source electrode is connected with the drain electrode of the 4th metal-oxide-semiconductor Q4 and one end of inductance L2 respectively; The described grid of the 4th metal-oxide-semiconductor Q4 is connected with the low tension switch pin of BUCK controller, source ground; The other end of described inductance L2 and one end of output capacitance C2, simultaneously as the power input of outfan and the battery management system of BUCK pressure unit.
When the voltage of battery output is lower than 12V, the voltage that battery exports is boosted by BOOST boosting unit, obtain stable 12V voltage as two grades of inputs, input and manage system start-up and normal operation to the 5V power voltage supply pond that BUCK pressure unit blood pressure lowering is stable.
When the voltage of battery output is not less than 12V, the dutycycle of metal-oxide-semiconductor Q2 can reach 100%, constant conduction, reduces loss.
Described voltage sampling unit includes resistance R1 and resistance R2, one end of described resistance R1 is connected with the negative pole of diode D1, the other end is connected to the control centre of battery management system, ground connection after series resistance R2 simultaneously, in real time the output voltage of battery is carried out dividing potential drop, yield less than the AD mouth that the sampled voltage of 5V is input to the control centre of battery management system, for the state of battery management system monitors battery.
In the present embodiment, described BOOST boosting unit and BUCK pressure unit all adopt synchronous rectification. In actual applications, it is also possible to adopt lower-cost asynchronous rectification according to actual needs.
Described BOOST controller and BUCK controller can be integrated BOOST+BUCK controller.
Embodiment described above only have expressed embodiment of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to this utility model the scope of the claims. It should be pointed out that, for the person of ordinary skill of the art, without departing from the concept of the premise utility, it is also possible to make some deformation and improvement, these broadly fall into protection domain of the present utility model. Therefore, the protection domain of this utility model patent should be as the criterion with claims.
Claims (9)
1. battery management system power supply circuits, it is characterised in that including: BOOST boosting unit and BUCK pressure unit, the input termination anode outfan of described BOOST boosting unit, the input of output termination BUCK pressure unit; The power input of the output termination battery management system of described BUCK pressure unit.
2. battery management system power supply circuits according to claim 1, it is characterized in that: also include the diode D1 being connected between battery and BOOST boosting unit, the positive pole of described diode D1 connects anode outfan, and negative pole connects BOOST boosting unit input.
3. battery management system power supply circuits according to claim 1, it is characterized in that: also include voltage sampling unit, described voltage sampling unit includes resistance R1 and resistance R2, resistance R1 one end is connected with the cathode output end of battery, ground connection after other end series resistance R2, the node of resistance R1 and resistance R2 is connected to the control centre of battery management system.
4. battery management system power supply circuits according to claim 1, it is characterized in that, described BOOST boosting unit includes: output input capacitance C1, input capacitance C3, inductance L1, the first switching tube, second switch pipe and BOOST controller U1, one end of described input capacitance C3 is connected with one end of anode outfan and inductance L1 respectively, other end ground connection; The other end of inductance L1 connects the input of the first switching tube and the input of second switch pipe respectively; The end that controls of the first switching tube is connected with the low tension switch pin of BOOST controller, output head grounding; The end that controls of second switch pipe is connected with the high-voltage switch gear pin of BOOST controller, and output terminates the one end exporting input capacitance C1, simultaneously as the input of the outfan of BOOST boosting unit and BUCK pressure unit; The other end ground connection of output input capacitance C1.
5. battery management system power supply circuits according to claim 4, it is characterised in that: described first switching tube is any one in diode, audion, metal-oxide-semiconductor; Described second switch pipe is audion or metal-oxide-semiconductor.
6. battery management system power supply circuits according to claim 1, it is characterized in that, described BUCK pressure unit includes: output input capacitance C1, output capacitance C2, inductance L2, the 3rd switching tube, the 4th switching tube and BUCK controller, and one end of described output input capacitance C1 is connected with the input of the 3rd switching tube; The end that controls of the 3rd switching tube is connected with the high-voltage switch gear pin of BUCK controller, and outfan is connected with the input of the 4th switch pin and one end of inductance L2 respectively; The high-voltage switch gear pin of BUCK controller and the control pin of the 4th switching tube connect; The output head grounding of the 4th switch pin; One end of another termination output capacitance C2 of inductance L2, and as the outfan of BUCK pressure unit, the other end ground connection of output capacitance C2.
7. battery management system power supply circuits according to claim 6, it is characterised in that: described 3rd switching tube is audion or metal-oxide-semiconductor; Described 4th switching tube is any one in diode, audion, metal-oxide-semiconductor.
8. the battery management system power supply circuits according to any one of claim 1-7, it is characterised in that: described BOOST boosting unit adopts synchronous rectification or asynchronous rectification.
9. the battery management system power supply circuits according to any one of claim 1-7, it is characterised in that: described BUCK pressure unit adopts synchronous rectification or asynchronous rectification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521108235.9U CN205283392U (en) | 2015-12-24 | 2015-12-24 | Battery management system supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521108235.9U CN205283392U (en) | 2015-12-24 | 2015-12-24 | Battery management system supply circuit |
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| CN205283392U true CN205283392U (en) | 2016-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201521108235.9U Active CN205283392U (en) | 2015-12-24 | 2015-12-24 | Battery management system supply circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110445208A (en) * | 2019-08-05 | 2019-11-12 | 维沃移动通信有限公司 | A kind of charging circuit and terminal |
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2015
- 2015-12-24 CN CN201521108235.9U patent/CN205283392U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110445208A (en) * | 2019-08-05 | 2019-11-12 | 维沃移动通信有限公司 | A kind of charging circuit and terminal |
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