CN210669625U - Power supply system conversion circuit for commercial vehicle - Google Patents
Power supply system conversion circuit for commercial vehicle Download PDFInfo
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- CN210669625U CN210669625U CN201921977231.2U CN201921977231U CN210669625U CN 210669625 U CN210669625 U CN 210669625U CN 201921977231 U CN201921977231 U CN 201921977231U CN 210669625 U CN210669625 U CN 210669625U
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Abstract
The utility model discloses a electrical power generating system converting circuit for commercial car belongs to car power technical field, include: the at least two second power supply units are connected in series and used for supplying power to the commercial vehicle; at least one first power supply unit for providing an initial voltage and charging a second power supply unit; the input end of the DCDC converter is connected with the first power supply unit, and the output end of the DCDC converter is connected with all the second power supply units; a first switch connected in series with the second power supply unit; and the second switches are the same as the first power supply units in number and are respectively connected with one second power supply unit and the DCDC converter. The utility model discloses utilized current 48V-12V on-vehicle step-down DCDC converter to turn into 12V DC power supply with 48V DC power supply, turned into 24V DC power supply through the second power supply unit voltage of two series connections. The two second power supply units connected in series supply power to the total load of the 24V electric appliance of the whole vehicle, and the electric energy conversion of the 48V power supply and the 24V power supply is realized.
Description
Technical Field
The utility model relates to an automotive power supply technical field specifically is a power supply system converting circuit for commercial car.
Background
At present, more and more attach importance to environmental protection, and the requirement to emission is more and more strict, and from the energy safety perspective in addition, oil consumption for the car has taken up six of oil consumption total volume, therefore, no matter be passenger car or commercial car, the production more oil-conserving electric automobile has become must the choice.
At present, most passenger vehicles are carried by 12V power supply voltage systems, and the current 12V power supply systems are mainly over-charged by 6V voltage in the last 50 th century. However, in automobiles of today, various electronic devices are more numerous than ever, and especially in many intelligent configurations, power is required, and a 12V power supply system is somewhat unwieldy. And the motorcycle type that present automatic start-stop technique carried on is more and more, after the engine stalled, if the time overlength, the condition that the electric quantity is not enough can appear, and the engine is forced to start again. Therefore, 48V power supply systems are gradually beginning to develop. Because the 48V power system has a larger battery, it can supply power to other devices for a longer time under the engine off state, and is some devices that cannot be driven by some existing 12V power sources.
However, compared with a passenger vehicle, the engine of the medium-heavy truck needs larger starting power and torque, so that the 48V motor/electric control system has the defect of overlarge current, and higher requirements are put forward on the cooling/electromagnetic compatibility of devices, so that the technical reserve of the 48V system of the passenger vehicle at present cannot be simply transplanted to the field of trucks for application.
The DCDC converter is used as a key component of an electric control system and is used for carrying out voltage conversion and energy transmission on 48V direct current generated by a motor in a 48V hybrid power truck and a 24V direct current system carried by a basic vehicle. At present, the volume production DCDC converters developed by various large motor/electric control system manufacturers are all 48V-12V, and because the vehicle-mounted electric appliances and the energy storage battery pack of the medium and heavy truck are all 24V standard, the 48V-12V DCDC converters cannot be directly used on the medium and heavy truck.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming among the above-mentioned background art because the on-vehicle electrical apparatus of well heavy card and energy storage battery group are the 24V standard, 48V-12V's DCDC converter can't be in the not enough of the direct use on well heavy card, provides a electrical power generating system converting circuit for commercial car.
The utility model provides a power supply system converting circuit for commercial car, it is used for doing commercial car provides the standard distribution voltage, include:
the at least two second power supply units are connected in series and used for supplying power to the commercial vehicle;
at least one first power supply unit for providing an initial voltage and charging the second power supply unit;
the DCDC converters are the same as the first power supply units in number, the input ends of the DCDC converters are connected with the first power supply units, the output ends of the DCDC converters are connected with all the second power supply units, and the DCDC converters are used for converting the initial voltage of the first power supply units into the power supply voltage of the second power supply units;
a first switch connected in series with the second power supply unit;
and the second switch is respectively connected with the second power supply unit and the DCDC converter.
The preferred scheme is as follows: the two second power supply units are arranged, the power supply voltage of the second power supply unit is 12V direct-current voltage, the two first power supply units and the two DCDC converters are arranged, the initial voltage of the first power supply unit is 48V direct-current voltage, and the DCDC converter is a 48V-12V vehicle-mounted step-down DCDC converter.
The preferred scheme is as follows: the two second power supply units are arranged, the power supply voltage of the second power supply unit is 12V direct-current voltage, the first power supply unit and the DCDC converter are both provided with one, the initial voltage of the first power supply unit is 48V direct-current voltage, and the DCDC converter is a 48V-12V vehicle-mounted step-down DCDC converter.
The preferred scheme is as follows: the positive pole of the first power supply unit is connected with the positive pole of the input end of the DCDC converter, the negative pole of the first power supply unit is connected with the negative pole of the input end of the DCDC converter, the positive pole of the output end of the DCDC converter is connected with the positive pole of the second power supply unit, and the negative pole of the output end of the DCDC converter is connected with the negative pole of the second power supply unit.
The preferred scheme is as follows: the first power supply unit is a 48V direct current power supply, and the second power supply unit is a 12V direct current power supply.
The preferred scheme is as follows: the second switch is connected between the positive electrode of the output end of the DCDC converter and the positive electrode of the second power supply unit, the negative electrode of the second power supply unit is connected with the ground wire, and a fourth switch is arranged between the negative electrode of the second power supply unit and the ground wire.
The preferred scheme is as follows: the at least two second power supply units connected in series are connected with an electric appliance total load, and the rated voltage of the electric appliance total load is 24V.
The preferred scheme is as follows: the emergency power supply is electrically connected with the main load of the electric appliance, the emergency power supply and the main load of the electric appliance are connected with a third switch in series, and the negative electrode of the emergency power supply is connected with the ground wire.
The preferred scheme is as follows: the standby power supply is provided with a power supply device, and the power supply device comprises any one or more of a 24V alternating-current generator, a solar power supply and a TEG tail gas waste heat generator.
The preferred scheme is as follows: the first power supply unit is provided with a BSG motor, and the BSG motor is connected with the first power supply unit through an inverter.
On the basis of the above technical scheme, compare with prior art, the utility model has the advantages as follows:
the utility model discloses a electrical power generating system converting circuit for commercial car, this electrical power generating system converting circuit have utilized current 48V-12V vehicle-mounted step-down type DCDC converter to turn into the 48V direct current voltage of first power supply unit the 12V direct current voltage of second power supply unit, and this second power supply unit is equipped with two, and two second power supply unit series connection back voltage transformation are 24V direct current power supply. The second power supply unit is connected in series and then supplies power to the total load of the 24V electric appliance of the whole vehicle, and the electric energy conversion of the 48V power supply and the 24V power supply is realized. The power supply system conversion circuit is provided with a first switch for controlling the connection of the two second power supply units, the first switch is closed when the two second power supply units need to be connected in series to supply power to the total load of a 24V electric appliance of the whole vehicle, and when the two second power supply units need to be charged, the first power supply unit charges the two second power supply units through the DCDC converter after the first switch is disconnected. The power supply system conversion circuit has the advantages of simple structure and low cost, and can greatly shorten the development period and the development cost.
Drawings
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a second embodiment of the present invention.
Detailed Description
The technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, 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 or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. It is to be noted that all the figures are exemplary representations. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The present invention will be described in further detail below with reference to specific embodiments and with reference to the accompanying drawings.
Example 1
Referring to fig. 1, an embodiment of the present invention provides a power system converting circuit for a commercial vehicle, including:
the specific number of the two second power supply units is not limited to two, and those skilled in the art can specifically set the number as needed, and the two second power supply units are taken as an example for explanation in this embodiment. In this embodiment, the two second power supply units are both 12V dc voltage, the second power supply unit is a 12V dc power supply, and the output voltage of the two second power supply units connected in series is 24V dc voltage. The two second power supply units are connected in series and then connected in parallel with an electric appliance total load, the rated voltage of the electric appliance total load is 24V, and the two second power supply units are connected in series and then used for supplying power with the electric appliance total load of the commercial vehicle.
Two first power supply units for providing an initial voltage and charging the second power supply unit; the specific number of the first power supply units is not limited to two, and those skilled in the art can specifically set the number as needed, and the embodiment takes two first power supply units as an example for description. In this embodiment, the initial voltages of the two first power supply units are both 48V dc voltages, and the first power supply unit is a 48V dc power supply.
Two DCDC converters, DCDC converter is 48V-12V vehicle-mounted step-down type DCDC converter. The specific number of the DCDC converters 3 is not limited to two, and can be specifically set by those skilled in the art according to needs, and the embodiment takes two DCDC converters as an example for description. The input end of the DCDC converter is connected with the first power supply unit, the output end of the DCDC converter is connected with the second power supply unit, and the DCDC converter is used for converting the 48V direct current voltage of the first power supply unit into the 12V direct current voltage of the second power supply unit. One DCDC converter of the present embodiment is correspondingly connected to one first power supply unit and one second power supply unit, respectively, so that the two DCDC converters of the present embodiment can respectively implement voltage conversion with the two first power supply units and the two second power supply units.
When the DCDC converter is respectively correspondingly connected with the first power supply unit and the second power supply unit: the positive pole of the first power supply unit is connected with the positive pole of the input end of the DCDC converter, the negative pole of the first power supply unit is connected with the negative pole of the input end of the DCDC converter, the positive pole of the output end of the DCDC converter is connected with the positive pole of the second power supply unit, and the negative pole of the output end of the DCDC converter is connected with the negative pole of the second power supply unit.
The first switch is connected with the two second power supply units in series to control disconnection and series connection of the two second power supply units, the two second power supply units are connected in series when the first switch is closed, and the two second power supply units are connected in series to provide 24V direct-current voltage for the commercial vehicle.
And the second switch is respectively connected with the second power supply unit and the DCDC converter. One or two second switches can be arranged in the embodiment, and when one second switch is arranged, two second power supply units and two DCDC converters share one second switch control; when the two second switches are provided, the two second power supply units and the two DCDC converters are respectively controlled by the second switches. The second switch is used for controlling the on-off of the second power supply unit and the DCDC converter, and when the second switch is closed, the first power supply unit charges the second power supply unit through the DCDC converter. The second switch is connected between the positive electrode of the output end of the DCDC converter and the positive electrode of the second power supply unit, the negative electrode of the second power supply unit is connected with the ground wire, and a fourth switch is arranged between the negative electrode of the second power supply unit and the ground wire.
Principle of operation
1. When the two second power supply units are in the charging mode:
sending an instruction through the electric control system to enable the first switch to be disconnected, and enabling the second switch and the fourth switch to be in a closed state;
the cathodes of the two second power supply units are both connected with the ground wire, and the cathodes of the output ends of the two DCDC converters are both connected with the ground wire;
the anode of the first power supply unit is connected with the anode of the input end of the DCDC converter, and the cathode of the first power supply unit is connected with the cathode of the input end of the DCDC converter; the positive pole of the output end of the DCDC converter is connected with the positive pole of the second power supply unit, the negative pole of the output end of the DCDC converter is connected with the negative pole of the second power supply unit, and the first power supply unit charges the second power supply unit.
2. When the two second power supply units are in the power supply mode:
sending an instruction through the electric control system to close the first switch, and enabling the second switch and the fourth switch to be in an open state;
the two second power supply units connected in series are communicated with the total load of the electric appliance of the whole vehicle, the positive pole of the two second power supply units connected in series is 24V, and the negative pole of the two second power supply units connected in series is 0V;
the two DCDC converters are respectively disconnected with the two second power supply units connected in series;
the two second power supply units connected in series jointly supply power to the total load of the electric appliance of the whole vehicle, and the two second power supply units connected in series are connected in parallel with the total load of the electric appliance of the whole vehicle after being connected in series.
Example 2
Referring to fig. 2, an embodiment of the present invention provides a power system converting circuit for a commercial vehicle, including:
the specific number of the two second power supply units is not limited to two, and those skilled in the art can specifically set the number as needed, and the two second power supply units are taken as an example for explanation in this embodiment. In this embodiment, the two second power supply units are both 12V dc voltage, the second power supply unit is a 12V dc power supply, and the output voltage of the two second power supply units connected in series is 24V dc voltage. The two second power supply units are connected in series and then connected in parallel with an electric appliance total load, the rated voltage of the electric appliance total load is 24V, and the two second power supply units are connected in series and then used for supplying power with the electric appliance total load of the commercial vehicle.
A first power supply unit for supplying an initial voltage and charging the second power supply unit; the specific number of the first power supply units is not limited to one, and those skilled in the art can specifically set the number according to needs. In this embodiment, the initial voltage of the first power supply unit is 48V dc voltage, and the first power supply unit is 48V dc power supply.
And the DCDC converter is a 48V-12V vehicle-mounted step-down DCDC converter. The specific number of the DCDC converters 3 is not limited to one, and can be specifically set by those skilled in the art according to needs, and the embodiment takes one DCDC converter as an example for description. The input end of the DCDC converter is connected with the first power supply unit, the output end of the DCDC converter is connected with the second power supply unit, and the DCDC converter is used for converting the 48V direct current voltage of the first power supply unit into the 12V direct current voltage of the second power supply unit. One DCDC converter of the present embodiment is correspondingly connected to one first power supply unit and two second power supply units, respectively, so that one DCDC converter of the present embodiment can realize voltage conversion with one first power supply unit and two second power supply units, respectively.
When the DCDC converter is respectively correspondingly connected with one first power supply unit and two second power supply units: the positive pole of the first power supply unit is connected with the positive pole of the input end of the DCDC converter, the negative pole of the first power supply unit is connected with the negative pole of the input end of the DCDC converter, the positive pole of the output end of the DCDC converter is respectively connected with the positive poles of the two second power supply units, and the negative pole of the output end of the DCDC converter is respectively connected with the negative poles of the two second power supply units.
The first switch is connected with the two second power supply units in series to control disconnection and series connection of the two second power supply units, the two second power supply units are connected in series when the first switch is closed, and the two second power supply units are connected in series to provide 24V direct-current voltage for the commercial vehicle.
And the second switch is respectively connected with the second power supply unit and the DCDC converter. The second switch of this embodiment may be provided in one, and when one second switch is provided, two second power supply units and one DCDC converter share one second switch control. The second switch is used for controlling the on-off of the second power supply unit and the DCDC converter, and when the second switch is closed, the first power supply unit charges the second power supply unit through the DCDC converter. The second switch is connected between the positive electrode of the output end of the DCDC converter and the positive electrode of the second power supply unit, the negative electrode of the second power supply unit is connected with the ground wire, and a fourth switch is arranged between the negative electrode of the second power supply unit and the ground wire.
Example 3
Referring to fig. 1 and 2, an embodiment of the present invention provides a power system conversion circuit for a commercial vehicle, and the present embodiment is different from embodiments 1 and 2 in that: the standby power supply is electrically connected with the total load of the electric appliance, a third switch is connected in series with the total load of the electric appliance, and the negative electrode of the standby power supply is connected with the ground wire. The standby power supply is provided with a power supply device, and the power supply device comprises any one or more of a 24V alternating-current generator, a solar power supply and a TEG tail gas waste heat generator.
Example 4
The embodiment of the utility model provides a power supply system converting circuit for commercial car, this embodiment lies in with the difference of embodiment 1 and embodiment 2: the first power supply unit is provided with a BSG motor, the BSG motor is connected with the first power supply unit through an inverter, the BSG motor is an Alternating Current (AC) 48V motor, the inverter converts direct-current voltage of the first power supply unit into alternating current and then drives the BSG motor to rotate, and the BSG motor realizes the automatic starting and stopping function of the commercial vehicle.
Various modifications and variations of the embodiments of the present invention may be made by those skilled in the art, and they are within the scope of the present invention provided they are within the scope of the claims and their equivalents.
What is not described in detail in the specification is prior art that is well known to those skilled in the art.
Claims (10)
1. A power system conversion circuit for a commercial vehicle for providing a standard voltage for the commercial vehicle, comprising:
the at least two second power supply units are connected in series and used for supplying power to the commercial vehicle;
at least one first power supply unit for providing an initial voltage and charging the second power supply unit;
the DCDC converters are the same as the first power supply units in number, the input ends of the DCDC converters are connected with the first power supply units, the output ends of the DCDC converters are connected with all the second power supply units, and the DCDC converters are used for converting the initial voltage of the first power supply units into the power supply voltage of the second power supply units;
a first switch connected in series with the second power supply unit;
and the second switch is respectively connected with the second power supply unit and the DCDC converter.
2. The power system switching circuit for a commercial vehicle as set forth in claim 1, wherein:
the two second power supply units are arranged, the power supply voltage of the second power supply unit is 12V direct-current voltage, the two first power supply units and the two DCDC converters are arranged, the initial voltage of the first power supply unit is 48V direct-current voltage, and the DCDC converter is a 48V-12V vehicle-mounted step-down DCDC converter.
3. The power system switching circuit for a commercial vehicle as set forth in claim 1, wherein:
the two second power supply units are arranged, the power supply voltage of the second power supply unit is 12V direct-current voltage, the first power supply unit and the DCDC converter are both provided with one, the initial voltage of the first power supply unit is 48V direct-current voltage, and the DCDC converter is a 48V-12V vehicle-mounted step-down DCDC converter.
4. The power system switching circuit for a commercial vehicle as set forth in claim 1, wherein:
the positive pole of the first power supply unit is connected with the positive pole of the input end of the DCDC converter, the negative pole of the first power supply unit is connected with the negative pole of the input end of the DCDC converter, the positive pole of the output end of the DCDC converter is connected with the positive pole of the second power supply unit, and the negative pole of the output end of the DCDC converter is connected with the negative pole of the second power supply unit.
5. The power system switching circuit for a commercial vehicle according to claim 4, wherein:
the first power supply unit is a 48V direct current power supply, and the second power supply unit is a 12V direct current power supply.
6. The power system switching circuit for a commercial vehicle according to claim 4, wherein:
the second switch is connected between the positive electrode of the output end of the DCDC converter and the positive electrode of the second power supply unit, the negative electrode of the second power supply unit is connected with the ground wire, and a fourth switch is arranged between the negative electrode of the second power supply unit and the ground wire.
7. The power system switching circuit for a commercial vehicle as set forth in claim 1, wherein:
the at least two second power supply units connected in series are connected with an electric appliance total load, and the rated voltage of the electric appliance total load is 24V.
8. The power system switching circuit for a commercial vehicle as set forth in claim 7, wherein:
the emergency power supply is electrically connected with the main load of the electric appliance, the emergency power supply and the main load of the electric appliance are connected with a third switch in series, and the negative electrode of the emergency power supply is connected with the ground wire.
9. The power system switching circuit for a commercial vehicle as set forth in claim 8, wherein:
the standby power supply is provided with a power supply device, and the power supply device comprises any one or more of a 24V alternating-current generator, a solar power supply and a TEG tail gas waste heat generator.
10. The power system switching circuit for a commercial vehicle as set forth in claim 1, wherein:
the first power supply unit is provided with a BSG motor, and the BSG motor is connected with the first power supply unit through an inverter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921977231.2U CN210669625U (en) | 2019-11-15 | 2019-11-15 | Power supply system conversion circuit for commercial vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921977231.2U CN210669625U (en) | 2019-11-15 | 2019-11-15 | Power supply system conversion circuit for commercial vehicle |
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| Publication Number | Publication Date |
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| CN210669625U true CN210669625U (en) | 2020-06-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921977231.2U Active CN210669625U (en) | 2019-11-15 | 2019-11-15 | Power supply system conversion circuit for commercial vehicle |
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| CN (1) | CN210669625U (en) |
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- 2019-11-15 CN CN201921977231.2U patent/CN210669625U/en active Active
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