CN109515248A - Electric vehicle pre-charging completes decision circuitry and pre-charging device - Google Patents
Electric vehicle pre-charging completes decision circuitry and pre-charging device Download PDFInfo
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- CN109515248A CN109515248A CN201811534915.5A CN201811534915A CN109515248A CN 109515248 A CN109515248 A CN 109515248A CN 201811534915 A CN201811534915 A CN 201811534915A CN 109515248 A CN109515248 A CN 109515248A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
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Abstract
The present invention relates to automobile power cell field, a kind of electric vehicle pre-charging is provided and completes decision circuitry and pre-charging device.It includes: battery pack sampling module that the electric vehicle pre-charging, which completes decision circuitry, for acquiring the cell voltage of battery pack；Pre-charging capacitor sampling module, for acquiring the charging voltage of pre-charging capacitor；Battery pack sampling module and pre-charging capacitor sampling module is electrically connected in comparator, two input terminal, is used for comparative cell voltage and pre-charge pressure, and when pre-charging capacitor preliminary filling is completed, exports specified level signal by its output end；And controller, it is electrically connected the output end of comparator, for when receiving specified level signal, determining that electric vehicle pre-charging is completed.The present invention is realized that voltage judges by circuit hardware logic, is worked more stable, reliable, is avoided software voltage measurement, is calculated, compares, A/D conversion, the links such as communication being isolated, and reduces the load of MCU.
Description
Technical field
The present invention relates to automobile power cell field, in particular to a kind of electric vehicle pre-charging completes decision circuitry and pre-
Charging unit.
Background technique
Electric car needs to be pre-charged system busbar capacitor when powering on, the reason for this is that system busbar capacitor is initial
Of-state voltage very little is zero, and moment impedance also seldom or levels off to zero, in this case, is powered moment to system busbar
Very big charging current can be generated, which will lead to bus capacitor and damage or reduce its service life because of rush of current, the electric current
Also result in contactor pitting of contact or adhesion and damage, the more big then consequence of electric current is more serious.
Therefore, conventional design is to limit its electric current by adding the method for current-limiting resistance to protect bus capacitor (following
Also referred to as pre-charging capacitor) and contacts of contactor, the effect of preliminary filling is the voltage for reducing main contactor contact both ends, to reduce touching
Arcing and the impact to pre-charging capacitor are powered on when point is attracted.Current-limiting resistance R constitutes the RC charging time with pre-charging capacitor C again
Constant, the size of the time constant influence vehicle and power on the deadline, and vehicle requires the electricity in pre-charging capacitor at the appointed time
Pressure is attracted main positive contactor after reaching requirement again.Therefore, judge whether the voltage on pre-charging capacitor C reaches at the appointed time to want
Seeking Truth judges the standard whether preliminary filling is completed.
Currently, the method for judging whether preliminary filling is completed is relatively more, but most of judgment method is software voltage calculating method.It should
The basic principle of software voltage calculating method is: in pre-charge process, by the value after the voltage value by acquiring contactor both ends
A/D (analog quantity conversion digital quantity) conversion is carried out, then (Microcontroller Unit, micro-control unit are commonly called as list by MCU
Piece machine) judge whether pre-charge pressure has reached defined voltage value.Conventional software is illustrated below in conjunction with attached drawing
The specific implementation process of voltage calculating method.
Fig. 1 is the connection schematic diagram of certain electric vehicle High-Voltage Electrical Appliances in the prior art, and Fig. 2 is the circuit structure for Fig. 1
Carry out the logic diagram that the judgement of high pressure preliminary filling is completed.In conjunction with Fig. 1 and Fig. 2, high pressure preliminary filling is carried out using software voltage calculating method and is sentenced
Disconnected detailed process are as follows: the main negative contactor S3 of closure first recloses preliminary filling contactor S1, battery pack is given by preliminary filling resistance R
Bus capacitor C charging, while charging, high-voltage acquisition circuit acquire voltage (i.e. battery pack voltage) between U1 and U01 and
Voltage (i.e. pre-charge pressure) between U2 and U02, and MCU is passed to by A/D conversion circuit and isolation communicating circuit, MCU comes
Judge pre-charge pressure, when detecting that the voltage between U2 and U02 reaches the specified value of voltage between U1 and U01, is judged as pre-
It charges into, the main negative contactor S3 of closure, disconnects preliminary filling contactor S1 at this time, recloses main positive contactor S2, i.e. high pressure has powered on
At.
It is found that when using software voltage calculating method, compare to carry out the calculating of accurate voltage digital-to-analogue difference, first have into
Row accurately measures the voltage between the voltage and U1 and U01 between U2 and U02, then carries out A/D conversion, then carried out by MCU
Compare and judges.And at least there are the following problems for this judgment method:
1) real-time is poor: since measured voltage is that high pressure also needs to carry out isolation communication after carrying out A/D conversion after sampling, this
Kind transmission mode results in the lag of acquisition data, and real-time is poor.
2) increase MCU load: preliminary filling contactor actuation after, need MCU always to between U2 and U02 voltage and
Voltage between U1 and U01 be monitored and compared with, therefore occupy MCU operation processing the time, increase load to MCU.
3) at high cost: the judgment method needs special high-pressure acquisition chip and isolation communication chip, results in answering for circuit
Miscellaneous and cost raising.
Summary of the invention
In view of this, the present invention is directed to propose a kind of electric vehicle pre-charging completes decision circuitry, at least partly to solve
Certainly above-mentioned technical problem.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
A kind of electric vehicle pre-charging completion decision circuitry, comprising: battery pack sampling module is electrically connected electric car
Battery pack, and the cell voltage for acquiring the battery pack；Pre-charging capacitor sampling module is electrically connected and is directed to the battery pack
Pre-charging capacitor, and for acquiring the charging voltage of the pre-charging capacitor；Institute is electrically connected in comparator, two input terminal
Battery pack sampling module and the pre-charging capacitor sampling module are stated, the cell voltage and the pre-charge pressure are used for, and
When the pre-charging capacitor preliminary filling is completed, specified level signal is exported by its output end；And controller, described in electric connection
The output end of comparator, for when receiving the specified level signal, determining that electric vehicle pre-charging is completed.
Further, the battery pack sampling module includes concatenated first resistor R1 and second resistance R2, and described
The positive and negative anodes of the battery pack, and the first input of the comparator are connected to after one resistance R1 and second resistance R2 series connection
End is connected on the route between the first resistor R1 and the second resistance R2.
Further, the precharge sample circuit includes concatenated 3rd resistor R3 and the 4th resistance R4, and described
The positive and negative anodes of the pre-charging capacitor are connected to after three resistance R3 and the 4th resistance R4 series connection, and the second of the comparator is defeated
Enter end to be connected on the route between the 3rd resistor R3 and the 4th resistance R4.
Further, one end of the first resistor R1 connects the anode of the battery pack, other end connection described second
One end of resistance R2, the other end of the second resistance R2 connect the cathode of the battery pack, one end of the 3rd resistor R3
The anode of the pre-charging capacitor is connected, the other end connects one end of the 4th resistance R4, the other end of the 4th resistance R4
Connect the cathode of the pre-charging capacitor；Wherein, the second resistance R2 and the 4th resistance R4 is configured with identical
Predetermined resistance value Ra, and the value relatable between the first resistor R1 and the 3rd resistor R3 is configured as:
R1=nR3+ (n-1) Ra
Wherein, n is ratio of the charging voltage relative to the cell voltage.
Further, one end of the first resistor R1 connects the anode of the battery pack, other end connection described second
One end of resistance R2, the other end of the second resistance R2 connect the cathode of the battery pack, one end of the 3rd resistor R3
The anode of the pre-charging capacitor is connected, the other end connects one end of the 4th resistance R4, the other end of the 4th resistance R4
Connect the cathode of the pre-charging capacitor；
Wherein, the first resistor R1 and the 3rd resistor R3 are configured with identical predetermined resistance value Rb, and
Value relatable between the second resistance R2 and the 4th resistance R4 is configured as:
R2=Rb*R4/ [nRb- (1-n) R4].
Wherein, n is ratio of the charging voltage relative to the cell voltage.
Further, the electric vehicle pre-charging completes decision circuitry further include: setting the comparator with it is described
Isolation controller part between controller, enable end connect the output end of the comparator, and output end connects the control
Device, and the isolation controller part is configured as the conducting that is enabled when receiving the specified level signal from the comparator
To transmit the specified level signal to the controller.
Further, the isolation controller part is photoelectrical coupler, and enable end is connected to institute by the 5th resistance R5
The output end of comparator is stated, output end is connected to the controller, and its feeder ear is connected to 5V electricity by the 6th resistance R6
Source.
Further, the isolation controller part is transformer or capacitor.
Further, described two input terminals of the comparator are respectively electrode input end and negative input, and institute
It states negative input and connects the battery pack sampling module, the electrode input end connects the pre-charging capacitor sampling module, institute
Stating specified level signal is high level signal, and the isolation controller part is configured as being made when receiving high level signal
It can conducting.
Compared with the existing technology, electric vehicle pre-charging completion decision circuitry of the present invention has the advantage that
1) electric vehicle pre-charging of the present invention, which completes decision circuitry, realizes from hardware view to battery pack preliminary filling
The judgement of electricity condition, relative to software voltage calculating method, it is low that signal transmits strong real-time, MCU load, and is easy to carry out circuit
Design.
2) electric vehicle pre-charging of the present invention complete decision circuitry work it is more stable, reliable, will not because by
Extraneous dynamic electric voltage variation and environment influence and generate wrong report phenomenon, while being directly realized by by comparator and photoelectrical coupler etc.
To the judgement whether precharge is completed, software voltage measurement is avoided, calculates, compare, A/D conversion, the links such as communication being isolated, and
Reduce the load of MCU.
2) the electric vehicle pre-charging completion decision circuitry of embodiment of the present invention does not need to configure dedicated acquisition chip
With isolation communication chip, it relatively is pre-charged judgement to realize only with electric resistance partial pressure, signal, structure is simple, and reduces simultaneously
Cost.
3) embodiment of the present invention completes the electric circuit characteristic of decision circuitry for the electric vehicle pre-charging of design, gives
Special resistance parameter choosing method more can guarantee the correct judgement whether completed to electric vehicle pre-charging.
Another object of the present invention is to propose a kind of electric vehicle pre-charging device, at least to be partially solved above-mentioned skill
Art problem.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
A kind of electric vehicle pre-charging device, it is pre- including battery pack, contactor group, pre-charging capacitor and above-mentioned electric car
Charging complete decision circuitry；Wherein, the battery pack is in parallel with the pre-charging capacitor；Wherein, the contactor group includes leading just
Contactor, main negative contactor, preliminary filling contactor and preliminary filling resistance, wherein after the preliminary filling contactor and preliminary filling resistance series connection
It is in parallel with the positive contactor of the master again, and the positive contactor of the master be connected to the battery pack positive terminal and the pre-charging capacitor
Positive terminal between, the negative contactor of master be connected to the battery pack negative pole end and the pre-charging capacitor negative pole end it
Between；Wherein, it includes: battery pack sampling module that the electric vehicle pre-charging, which completes decision circuitry, is electrically connected the battery
It wraps to acquire the cell voltage of the battery pack；Pre-charging capacitor sampling module, it is described to acquire to be electrically connected the pre-charging capacitor
The charging voltage of pre-charging capacitor；The battery pack sampling module and described pre- is electrically connected in comparator, two input terminal
Sampling module is held in charging, is used for the cell voltage and the pre-charge pressure, and when the pre-charging capacitor preliminary filling is completed,
Specified level signal is exported by its output end；And controller, it is electrically connected the output end of the comparator, for receiving
When to the specified level signal, determine that electric vehicle pre-charging is completed.
The electric vehicle pre-charging device and above-mentioned electric vehicle pre-charging complete decision circuitry compared with the existing technology
Possessed advantage is identical, and details are not described herein.
Other features and advantages of the present invention will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
The attached drawing for constituting a part of the invention is used to provide further understanding of the present invention, schematic reality of the invention
It applies mode and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the connection schematic diagram of certain electric vehicle High-Voltage Electrical Appliances in the prior art；
Fig. 2 is the logic diagram that the judgement completion of high pressure preliminary filling is carried out for the circuit structure of Fig. 1；
Fig. 3 is a kind of structural schematic diagram of electric vehicle pre-charging completion decision circuitry of embodiment of the present invention, and same
When show the structure of corresponding electric vehicle pre-charging device；And
Fig. 4 is the structural representation of the example electric vehicle pre-charging completion decision circuitry in the preferred embodiment for the present invention
Figure, and also show the structure of corresponding electric vehicle pre-charging device.
Description of symbols:
110 battery pack sampling module, 120 pre-charging capacitor sampling module
130 comparator, 140 controller
150 isolation controller part, 200 battery pack
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can
To be combined with each other.
In embodiments of the present invention, " electric connection " is used to state the signal connection between two components, such as controls
Electrical power connection between signal and feedback signal and two components.In addition, " connection " involved in embodiment of the present invention
" electric connection " that can be wired connection, be also possible to be wirelessly connected, and be related to can be the direct electricity between two components
Property connection, be also possible to the indirect electric connection by other component.
The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiment.
Fig. 3 is a kind of structural schematic diagram of electric vehicle pre-charging completion decision circuitry of embodiment of the present invention, wherein
The electric vehicle pre-charging completes decision circuitry is mainly used for judging whether the precharge of the bus capacitor for electric car is complete
At, and the precharge principle of the bus capacitor about electric car can refer to Fig. 1 and the associated description of Fig. 2 is understood, herein
It repeats no more.
As shown in figure 3, it may include: that battery pack is adopted that the electric vehicle pre-charging of embodiment of the present invention, which completes decision circuitry,
Egf block 110 is electrically connected the battery pack 200 of electric car, and the cell voltage for acquiring the battery pack 200；In advance
Sampling module 120 is held in charging, is electrically connected the pre-charging capacitor C for being directed to the battery pack, and for acquiring the pre-charging capacitor C
Charging voltage；The battery pack sampling module 110 and the preliminary filling is electrically connected in comparator 130, two input terminal
Capacitor sampling module 120 is used for the cell voltage and the pre-charge pressure, and completes in the pre-charging capacitor C preliminary filling
When, specified level signal is exported by its output end；And controller 140, it is electrically connected the output end of the comparator 130,
For when receiving the specified level signal, determining that electric vehicle pre-charging is completed.
For example, battery pack sampling module 110, pre-charging capacitor sampling module 120 acquire cell voltage U in real time respectively
Specified high level signal is exported when comparator 130 judges that UC is more than or equal to U with charging voltage UC, and controller 140 1
Denier receives high level signal, that is, can determine that electric vehicle pre-charging is completed, without controller to cell voltage and charging
Voltage is monitored and compares, and advantageously reduces the operation processing time of controller, mitigates its load.
In a preferred embodiment, it can also include: to be arranged in institute that the electric vehicle pre-charging, which completes decision circuitry,
The isolation controller part 150 between comparator 130 and the controller 140 is stated, enable end connects the defeated of the comparator 130
Outlet, output end connects the controller 140, and the isolation controller part is configured as connecing from the comparator 140
Conducting is enabled when receiving the specified level signal to transmit the specified level signal to the controller 140.Citing and
Speech, isolation controller part 150 could only be connected when comparator 130 exports high level signal, so that just have can for controller 140
It can receive high level signal, and it is that judge whether precharge is completed unique that whether controller 140, which receives high level signal,
Standard.
Accordingly, different from the software voltage calculating method mentioned in background technique, embodiment of the present invention is adopted by battery pack
Egf block 110, capacitor sampling module 120, comparator 130 and controller 140 are realized from hardware view and are pre-charged to battery pack
The judgement of state, relative to software voltage calculating method, it is low that signal transmits strong real-time, MCU load, and is easy to carry out circuit and sets
Meter.
In embodiment of the present invention, the battery pack sampling module 110 can be any battery pack voltage that can acquire
Circuit or device, the pre-charging capacitor sampling module 120 can be the circuit or device of any voltage that can acquire pre-charging capacitor
Part, the comparator 130 can be the conventional comparator with amplifier output end and positive-negative input end, the controller 140
It can be the controller that MCU etc. has routine data processing function.
Fig. 4 is the structural representation of the example electric vehicle pre-charging completion decision circuitry in the preferred embodiment for the present invention
Figure, battery pack sampling module 110 described in the example and the pre-charging capacitor sampling module 120 are using the electricity by resistance configuration
Road, the comparator 130 are conventional comparator, and the controller 140 is the MCU of the battery management chip of power vehicle.
Specifically, the battery pack sampling module 110 may include concatenated first resistor R1 and second resistance R2, and institute
It states and is connected to the positive and negative anodes of the battery pack after first resistor R1 and second resistance R2 series connection, and the comparator 130
First input end is connected to the A point on the route between the first resistor R1 and the second resistance R2, such as in Fig. 4.Institute
Stating precharge sample circuit 120 may include concatenated 3rd resistor R3 and the 4th resistance R4, and the 3rd resistor R3 and institute
State the positive and negative anodes (positive HV+ and cathode HV-) that the pre-charging capacitor C is connected to after the 4th resistance R4 connects, and the comparator
The second input terminal be connected to the B point on the route between the 3rd resistor R3 and the 4th resistance R4, such as in Fig. 4.
More specifically, for the first resistor R1, the second resistance R2, the 3rd resistor R3 and the described 4th
One end of resistance R4, the first resistor R1 connect the anode of the battery pack, and the other end connects the one of the second resistance R2
End, the other end of the second resistance R2 connect the cathode of the battery pack, and one end connection of the 3rd resistor R3 is described pre-
Charge the anode (HV+) held, and the other end connects one end of the 4th resistance R4, and the other end of the 4th resistance R4 connects institute
State the cathode (HV-) of pre-charging capacitor.
In the example, described two input terminals (i.e. first input end and the second input terminal) of the comparator are positive respectively
Pole input terminal and negative input, and the negative input connects the battery pack sampling module 110, the electrode input end
Connect the pre-charging capacitor sampling module 120, the specified level signal is high level signal, and the isolation controller part
150 are configured as the conducting that is enabled when receiving high level signal.
Here, the isolation controller part 150 is, for example, photoelectrical coupler, enable end is connected to by the 5th resistance R5
The output end of the comparator 130, feeder ear are connected to 5V power supply by the 6th resistance R6, and ground terminal is then directly grounded
(GND), and its output end is connected to the controller 140, such as is connected directly to the GPIO interface of MCU, and MCU reads height electricity
Ordinary mail number, to judge whether precharge is completed.In other examples, the isolation controller part 150 can also be used transformer or
Capacitor etc. has the device of coupling isolation features.
Accordingly, the example electric vehicle pre-charging complete decision circuitry working principle are as follows: comparator real-time monitoring R1 and
A point voltage (R2 both end voltage) between R2 and the B point voltage (R4 both end voltage) between R3 and R4, under original state, B point
Voltage is less than A point voltage, and comparator exports always low level signal, at this point, photoelectrical coupler will not work, in disconnection shape
State, therefore, MCU will not detect signal.Since battery pack gives always pre-charging capacitor C to charge, B point voltage is persistently increased, when B point
When voltage is more than or equal to A point voltage, the overturning of comparator output level exports and locates for high level at this point, photoelectrical coupler works
In on state, therefore, when MCU can detect high level signal, therefore, it is determined that precharge is completed.
It is the key that judge whether precharge is completed it is found that correctly choosing the resistance value of R1, R2, R3, R4.The present invention is implemented
In, before the resistance value for choosing R1, R2, R3, R4, the big of C should be held according to operating current, the bus precharge of contacts of contactor actuation
The small relationship to determine charging voltage UC Yu cell voltage U is determined as preliminary filling when charging voltage UC is n times of cell voltage U
It completes, it may be assumed that
UC=nU (1)
Wherein, n is ratio of the charging voltage relative to the cell voltage, and to determine value less than 1.
Based on the formula (1), two methods are can be used to choose the resistance value of R1, R2, R3, R4 in embodiment of the present invention, are had
Body is as follows:
In first method, the second resistance R2 and the 4th resistance R4 are configured with identical preset resistance
Value Ra, and the value relatable between the first resistor R1 and the 3rd resistor R3 is configured as:
R1=nR3+ (n-1) Ra (2)
Specifically, first choose R2=R4=Ra (known), and when preliminary filling complete when, UA=UB, in conjunction with Fig. 4 it is found that
UA=U* (R1+R2)/R2, UB=UC* (R3+R4)/R4 can be derived that is, according to UA=UB:
U* (R1+R2)/R2=UC* (R3+R4)/R4 (3)
Due to R2=R4=Ra, UC/U=n, then U* (R1+Ra)=U*n* (R3+Ra) is to get arriving above-mentioned formula (2):
R1=nR3+ (n-1) Ra.
In second method, the first resistor R1 and the 3rd resistor R3 are configured with identical preset resistance
Value Rb, and the value relatable between the second resistance R2 and the 4th resistance R4 is configured as:
R2=Rb*R4/ [nRb- (1-n) R4] (4)
Specifically, R1=R3=Rb (known) is chosen first, can derives the formula (4) further according to above-mentioned formula (3).
To sum up, the electric vehicle pre-charging of embodiment of the present invention, which completes decision circuitry, mainly has the following aspects
Advantage:
1) voltage detection method is innovated: being realized that voltage judges in embodiment of the present invention by circuit hardware logic, can be replaced
For the software voltage calculating method mentioned in background technique, and it is more stable, reliable to work, will not be because being changed by extraneous dynamic electric voltage
And environment influences and generates wrong report phenomenon.
2) fast response time: software operation is substituted by hardware logic in embodiment of the present invention, passes through comparator and photoelectricity
Coupler etc. is directly realized by the judgement whether completed of precharge, avoid software voltage measurement, calculate, compare, A/D conversion,
The links such as isolation communication.
3, the load of MCU is reduced: because avoiding software voltage measurement, calculating, compare, the rings such as A/D conversion, isolation communicate
Section, to reduce the load of the MCU of battery management chip.
4, structure is simple: the electric vehicle pre-charging completion decision circuitry of embodiment of the present invention does not need to configure dedicated
Acquisition chip and isolation communication chip are relatively pre-charged judgement only with electric resistance partial pressure, signal to realize, structure is simple, and same
When reduce costs.
5, embodiment of the present invention completes the electric circuit characteristic of decision circuitry for the electric vehicle pre-charging of design, gives
Special resistance parameter choosing method more can guarantee the correct judgement whether completed to electric vehicle pre-charging.
Embodiment of the present invention additionally provides a kind of electric vehicle pre-charging device, and Fig. 3 and Fig. 4 also show this electricity
Electrical automobile pre-charging device.As shown in Figures 3 and 4, the electric vehicle pre-charging device include battery pack 200, contactor group,
Electric vehicle pre-charging described in pre-charging capacitor C and above embodiment completes decision circuitry.Wherein, the battery pack 200 with
The pre-charging capacitor C is in parallel, and the contactor group include main positive contactor K1, main negative contactor K3, preliminary filling contactor K2 and
Preliminary filling resistance R0, wherein the preliminary filling contactor K2 and the preliminary filling resistance R0 series connection after again with the positive contactor K1 of the master simultaneously
Connection, and the positive contactor K1 of the master is connected between the positive terminal of the battery pack 200 and the positive terminal of the pre-charging capacitor C,
The negative contactor K3 of master is connected between the negative pole end of the battery pack 200 and the negative pole end of the pre-charging capacitor C.
Wherein, the electric vehicle pre-charging completes the structure of decision circuitry as described above, details are not described herein.
The working principle of the electric vehicle pre-charging device of embodiment of the present invention are as follows: the main negative contact K3 of closure and preliminary filling connect
Tentaculum K2, battery pack are charged by preliminary filling resistance RO to pre-charging capacitor C, and R1 and R2 form bleeder circuit, and R3 and R4, which are also formed, to be divided
Volt circuit.Meanwhile comparator real-time monitoring A point voltage and B point voltage.Under original state, B point voltage is less than A point voltage, than
Low level signal is exported always compared with device, at this point, photoelectrical coupler will not work, is in an off state, and therefore, MCU will not be detected
To signal.Since battery pack gives always pre-charging capacitor C to charge, B point voltage is persistently increased, when B point voltage is more than or equal to A point voltage
When, the overturning of comparator output level exports as high level, at this point, photoelectrical coupler works, it is in the conductive state, and therefore, MCU
When can detect high level signal, to judge that precharge is completed.
Further, after the completion of judging precharge, the main negative contactor K3 of closure disconnects preliminary filling contactor K2, recloses master
Positive contactor K1, high pressure power on completion, and battery pack starts to power to the High-Voltage Electrical Appliances of vehicle, and middle/high-voltage electrical appliance is, for example, electricity
Machine, DC/DC converter, BSG (Belt Driven Starter Generator, belt are driven starter-generator driving) etc..
Here, other implementation details and effect of the electric vehicle pre-charging device about embodiment of the present invention can refer to
The above-mentioned embodiment that decision circuitry is completed about electric vehicle pre-charging, details are not described herein.
The optional embodiment of embodiment of the present invention, still, embodiment party of the present invention is described in detail in conjunction with attached drawing above
Formula be not limited to the above embodiment in detail, in the range of the technology design of embodiment of the present invention, can to this
The technical solution of invention embodiment carries out a variety of simple variants, these simple variants belong to the protection of embodiment of the present invention
Range.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, it can be combined in any appropriate way.In order to avoid unnecessary repetition, embodiment of the present invention
To various combinations of possible ways, no further explanation will be given.
In addition, any combination can also be carried out between a variety of different embodiments of embodiment of the present invention, as long as its
Without prejudice to the thought of embodiment of the present invention, embodiment of the present invention disclosure of that equally should be considered as.
Claims (10)
1. a kind of electric vehicle pre-charging completes decision circuitry, which is characterized in that the electric vehicle pre-charging completes judgement electricity
Road includes:
Battery pack sampling module is electrically connected the battery pack of electric car, and the cell voltage for acquiring the battery pack；
Pre-charging capacitor sampling module is electrically connected the pre-charging capacitor for being directed to the battery pack, and for acquiring the pre-charging capacitor
Charging voltage；
The battery pack sampling module and the pre-charging capacitor sampling module is electrically connected in comparator, two input terminal,
It is defeated by its output end for the cell voltage and the pre-charge pressure, and when the pre-charging capacitor preliminary filling is completed
Specified level signal out；And
Controller is electrically connected the output end of the comparator, for determining electronic when receiving the specified level signal
Automobile precharge is completed.
2. electric vehicle pre-charging according to claim 1 completes decision circuitry, which is characterized in that the battery pack sampling
Module includes concatenated first resistor R1 and second resistance R2, and connects after the first resistor R1 and second resistance R2 series connection
The positive and negative anodes of the battery pack are connected to, and the first input end of the comparator is connected to the first resistor R1 and described second
On route between resistance R2.
3. electric vehicle pre-charging according to claim 2 completes decision circuitry, which is characterized in that the precharge sampling
Circuit includes concatenated 3rd resistor R3 and the 4th resistance R4, and connects after the 3rd resistor R3 and the 4th resistance R4 series connection
The positive and negative anodes of the pre-charging capacitor are connected to, and the second input terminal of the comparator is connected to the 3rd resistor R3 and described
On route between four resistance R4.
4. electric vehicle pre-charging according to claim 3 completes decision circuitry, which is characterized in that the first resistor R1
One end connect the anode of the battery pack, the other end connects one end of the second resistance R2, and the second resistance R2's is another
One end connects the cathode of the battery pack, and one end of the 3rd resistor R3 connects the anode of the pre-charging capacitor, and the other end connects
One end of the 4th resistance R4 is connect, the other end of the 4th resistance R4 connects the cathode of the pre-charging capacitor；
Wherein, the second resistance R2 and the 4th resistance R4 are configured with identical predetermined resistance value Ra, and described
Value relatable between first resistor R1 and the 3rd resistor R3 is configured as:
R1=nR3+ (n-1) Ra
Wherein, n is ratio of the charging voltage relative to the cell voltage.
5. electric vehicle pre-charging according to claim 3 completes decision circuitry, which is characterized in that the first resistor R1
One end connect the anode of the battery pack, the other end connects one end of the second resistance R2, and the second resistance R2's is another
One end connects the cathode of the battery pack, and one end of the 3rd resistor R3 connects the anode of the pre-charging capacitor, and the other end connects
One end of the 4th resistance R4 is connect, the other end of the 4th resistance R4 connects the cathode of the pre-charging capacitor；
Wherein, the first resistor R1 and the 3rd resistor R3 are configured with identical predetermined resistance value Rb, and described
Value relatable between second resistance R2 and the 4th resistance R4 is configured as:
R2=Rb*R4/ [nRb- (1-n) R4].
Wherein, n is ratio of the charging voltage relative to the cell voltage.
6. electric vehicle pre-charging according to claim 1 completes decision circuitry, which is characterized in that the electric car is pre-
Charging complete decision circuitry further include:
Isolation controller part between the comparator and the controller is set, and enable end connects the defeated of the comparator
Outlet, output end connects the controller, and the isolation controller part is configured as receiving institute from the comparator
Conducting is enabled when stating specified level signal to transmit the specified level signal to the controller.
7. electric vehicle pre-charging according to claim 6 completes decision circuitry, which is characterized in that the isolation controller
Part is photoelectrical coupler, and enable end is connected to the output end of the comparator by the 5th resistance R5, and output end is connected to
The controller, and its feeder ear is connected to 5V power supply by the 6th resistance R6.
8. electric vehicle pre-charging according to claim 6 completes decision circuitry, which is characterized in that the isolation controller
Part is transformer or capacitor.
9. electric vehicle pre-charging according to claim 6 completes decision circuitry, which is characterized in that the institute of the comparator
Stating two input terminals is respectively electrode input end and negative input, and the negative input connects the battery pack and samples mould
Block, the electrode input end connect the pre-charging capacitor sampling module, and the specified level signal is high level signal, and described
Isolation controller part is configured as the conducting that is enabled when receiving high level signal.
10. a kind of electric vehicle pre-charging device, which is characterized in that the electric vehicle pre-charging device includes battery pack, connects
Electric vehicle pre-charging described in any one of tentaculum group, pre-charging capacitor and claim 1 to 9 completes decision circuitry；
Wherein, the battery pack is in parallel with the pre-charging capacitor；
Wherein, the contactor group includes main positive contactor, main negative contactor, preliminary filling contactor and preliminary filling resistance, wherein described
It is in parallel with the positive contactor of the master again after preliminary filling contactor and preliminary filling resistance series connection, and the positive contactor of the master is connected to institute
It states between the positive terminal of battery pack and the positive terminal of the pre-charging capacitor, the negative contactor of master is connected to the negative of the battery pack
Extremely between the negative pole end of the pre-charging capacitor；
Wherein, it includes: battery pack sampling module that the electric vehicle pre-charging, which completes decision circuitry, is electrically connected the battery
It wraps to acquire the cell voltage of the battery pack；Pre-charging capacitor sampling module, it is described to acquire to be electrically connected the pre-charging capacitor
The charging voltage of pre-charging capacitor；The battery pack sampling module and described pre- is electrically connected in comparator, two input terminal
Sampling module is held in charging, is used for the cell voltage and the pre-charge pressure, and when the pre-charging capacitor preliminary filling is completed,
Specified level signal is exported by its output end；And controller, it is electrically connected the output end of the comparator, for receiving
When to the specified level signal, determine that electric vehicle pre-charging is completed.
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| CN201811534915.5A CN109515248A (en) | 2018-12-14 | 2018-12-14 | Electric vehicle pre-charging completes decision circuitry and pre-charging device |
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