CN206865159U - Condition checkout gear, the DC charging system of DC charging relay - Google Patents
Condition checkout gear, the DC charging system of DC charging relay Download PDFInfo
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- CN206865159U CN206865159U CN201720367879.2U CN201720367879U CN206865159U CN 206865159 U CN206865159 U CN 206865159U CN 201720367879 U CN201720367879 U CN 201720367879U CN 206865159 U CN206865159 U CN 206865159U
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Abstract
The utility model provides a kind of condition checkout gear, the DC charging system of DC charging relay, belongs to DC charging technical field.The condition checkout gear of DC charging relay of the present utility model includes：The first line between the first high voltage bus and the second high voltage bus is bridged, first resistor unit and 3rd resistor unit have been disposed in series in first line；The second circuit between the first high voltage bus and the second high voltage bus is bridged, second resistance unit and the 4th resistance unit have been disposed in series on the second circuit；Switch block, its both ends are electrically connected on the second circuit in the first line between first resistor unit and 3rd resistor unit between second resistance unit and the 4th resistance unit；And state obtaining widget, it is used to read the information of the information of voltage at the first end for representing switch block or the second end to judge DC charging relay state in which.The utility model has the advantages of state-detection is accurate, reliable, detection is simple.
Description
Technical field
Background technology
The utility model belongs to DC charging technical field, be related to DC charging relay condition checkout gear and
It is configured with the DC charging system of the condition checkout gear.
Relay（Also known as " contactor "）As a kind of common controllable switch element extensive use in various circuits,
For example, applied on the HVDC charge circuit of the DC charging module of electric automobile, for controlling HVDC to charge back
The conducting and shut-off on road, high voltage power battery is charged so as to control.
High-voltage relay mainly forms by the control unit as control terminal and as the contact switch of actuating station, passes through control
Whether the low current signal control contact switch of part processed connects high current, so that realization is gone to control the fortune of high current with low current
Make.Contact switch is typically to carry out open or close in a manner of mechanical action, mechanical breakdown etc. easily be present.
Because high-voltage relay has the possibility to break down, for example, contact switch occurs " adhesion " and can not be controlled system
Part is enabled to be changed to off-state.Accordingly, there exist to high-voltage relay carry out state-detection demand, with avoid because high pressure after
Various risks caused by apparatus failure.
Diagnosis to high-voltage relay state at present can be realized by using the mode of increase feedback contact.But by
In on high-voltage relay increased feedback contact be also mechanically to realize state-detection, also increase to a certain extent
Add a source of trouble, reduce the reliability of system；Also, this mode is not directly to judge the contact of relay actuating station
The state of switch, the risk of erroneous judgement or state without detection be present.
In view of this, it is necessary to propose a kind of state-detection mode of new high-voltage relay.
Utility model content
To solve at least one aspect of above technical problem, the utility model provides following technical scheme.
According to one side of the present utility model, there is provided a kind of condition checkout gear of DC charging relay, wherein, it is described
DC charging relay is arranged on the first high voltage bus and/or the second high voltage bus on DC charging loop；The shape
State detection means includes：
The first line between the first high voltage bus and the second high voltage bus is bridged, is set in series in the first line
It is equipped with first resistor unit and 3rd resistor unit；
The second circuit between the first high voltage bus and the second high voltage bus is bridged, is set in series on second circuit
It is equipped with second resistance unit and the 4th resistance unit；
Switch block, its first end are electrically connected to first between the first resistor unit and the 3rd resistor unit
On circuit, its second end is electrically connected on the second circuit between the second resistance unit and the 4th resistance unit；And
State obtaining widget, it is used for the letter for reading the information of voltage at the first end for representing the switch block or the second end
Cease to judge the DC charging relay state in which；
Wherein, the DC charging relay is arranged between the first line and second circuit corresponding one section
On first high voltage bus and/or the second high voltage bus.
According to the condition checkout gear of the embodiment of the utility model one, wherein, the first resistor unit, second resistance list
Member, 3rd resistor unit and the 4th resistance unit are resistance more than mega-ohms or mega-ohms.
According to the condition checkout gear of the embodiment of the utility model one, wherein, the first resistor unit, second resistance list
The resistance value of member, 3rd resistor unit and the 4th resistance unit is of substantially equal.
According to the condition checkout gear of the embodiment of the utility model one, wherein, in the first line and second line
Switch element is set respectively on road, when carrying out state-detection, the switch element closure, when without state-detection, institute
State switch element disconnection.
According to the condition checkout gear of the embodiment of the utility model one, wherein, the state obtaining widget includes：
Information of voltage reading circuit, it is used for the information of voltage for reading the first end for representing the switch block or the second end
Output information；With
Condition judgment module, it is used to be compared to sentence with corresponding perfect condition coefficient according to the output information of reading
The DC charging relay that breaks is presently at off-state or closure state；
Wherein, the perfect condition coefficient be based on the DC charging relay be normally off it is lower or
It is normal to be in the information of voltage reading circuit is read under closure state output information to obtain in advance.
According to the condition checkout gear of the embodiment of the utility model one, wherein, the information of voltage reading circuit includes：
Bleeder circuit, its first end electrically connect first end or the second end of the switch block, and its second end is grounded, its
In, it is disposed in series on the bleeder circuit for the 5th resistance unit of partial pressure and the 6th resistance unit；With
Isolate operational amplifier, one input end is electrically connected between the 5th resistance unit and the 6th resistance unit
On bleeder circuit.
According to the condition checkout gear of the embodiment of the utility model one, wherein, the state obtaining widget also includes：From institute
State the output end collection information of isolation operational amplifier and the information of collection is carried out to the analog-to-digital conversion module of analog-to-digital conversion.
According to the condition checkout gear of the embodiment of the utility model one, wherein, the DC charging relay includes difference
The first DC charging relay being arranged on first high voltage bus and second high voltage bus and the second direct current fill
Electrical relay.
According to the condition checkout gear of the embodiment of the utility model one, wherein, the perfect condition coefficient includes the first reason
Think coefficient of regime, secondary ideal coefficient of regime, the 3rd perfect condition coefficient and the 4th perfect condition coefficient；
Wherein, closure state, the first DC charging relay and second direct current are in the switch block
Charge relay is normally off down, correspondingly obtains the first perfect condition coefficient；
Wherein, closure state, the second DC charging relay are in normally in closure in the switch block
State, the first DC charging relay are normally off down, correspondingly obtain secondary ideal coefficient of regime；
Wherein, closure state, the first DC charging relay are in normally in closure in the switch block
State, the second DC charging relay are normally off down, correspondingly obtain the 3rd perfect condition coefficient；
Wherein, closure state, the first DC charging relay and second direct current are in the switch block
Under charge relay is normally in the closed state, the 4th perfect condition coefficient is correspondingly obtained.
According to the condition checkout gear of the embodiment of the utility model one, wherein, the condition judgment module further by with
It is set to：
Virtual condition coefficient is calculated according to the output information of reading, if virtual condition coefficient and the described first preferable shape
One of corresponding base in state coefficient, secondary ideal coefficient of regime, the 3rd perfect condition coefficient and the 4th perfect condition coefficient
This is equal, then the first DC charging relay and the second DC charging relay institute are right described in when obtaining the perfect condition coefficient
The state answered is the current state of the first DC charging relay and the second DC charging relay.
According to another aspect of the present utility model, there is provided one kind is filled using condition checkout gear of the present utility model to direct current
The method of the carry out state-detection of electrical relay, including step：
The DC charging relay cut-off/close is controlled, controlling switch part is in closure state；
Read the output information of the information of voltage at the first end for representing the switch block or the second end；And
It is compared according to the output information of reading with corresponding perfect condition coefficient to judge the DC charging relay
Whether device is currently off/closure state；
Wherein, the perfect condition coefficient be based in the case where the DC charging relay is normally off/
It is normal to be under closure state the output information that is read to obtain in advance.
According to the condition detection method of the embodiment of the utility model one, wherein, the DC charging relay includes difference
The first DC charging relay being arranged on first high voltage bus and second high voltage bus and the second direct current fill
Electrical relay；
Wherein, the perfect condition coefficient includes the first perfect condition coefficient, secondary ideal coefficient of regime, the 3rd preferable shape
State coefficient and the 4th perfect condition coefficient；
Wherein, closure state, the first DC charging relay and second direct current are in the switch block
Charge relay is normally off down, correspondingly obtains the first perfect condition coefficient；
Wherein, closure state, the second DC charging relay are in normally in closure in the switch block
State, the first DC charging relay are normally off down, correspondingly obtain secondary ideal coefficient of regime；
Wherein, closure state, the first DC charging relay are in normally in closure in the switch block
State, the second DC charging relay are normally off down, correspondingly obtain the 3rd perfect condition coefficient；
Wherein, closure state, the first DC charging relay and second direct current are in the switch block
Under charge relay is normally in the closed state, the 4th perfect condition coefficient is correspondingly obtained.
According to the condition detection method of the embodiment of the utility model one, wherein, in the comparison and judgment step, according to
The output information of reading calculates virtual condition coefficient, if virtual condition coefficient and the first perfect condition coefficient, second
It is one of corresponding of substantially equal in perfect condition coefficient, the 3rd perfect condition coefficient and the 4th perfect condition coefficient, then
First DC charging relay described in when obtaining the perfect condition coefficient and the state corresponding to the second DC charging relay are i.e.
For the current state of the first DC charging relay and the second DC charging relay.
According to the condition detection method of the embodiment of the utility model one, wherein, obtaining the mistake of the perfect condition coefficient
Cheng Zhong, the output information is included divided by is applied to the meter of the voltage between the first high voltage bus and the second high voltage bus
Calculation is handled；So in the comparison step, identical calculating processing is carried out to the output information of the reading, then carries out institute
State comparison.
According to the condition detection method of the embodiment of the utility model one, wherein, in addition to step：
Control that the DC charging relay is in closure state, the switch block is off；And
The output information for reading the information of voltage at the first end for representing the switch block or the second end is applied to calculate
Voltage between first high voltage bus and the second high voltage bus.
According to further aspect of the present utility model, there is provided a kind of DC charging system of electric automobile, it is used for high pressure
Electrokinetic cell carries out DC charging, and it includes：
Direct-current charging interface；
The first high voltage bus that the direct-current charging interface is electrically connected with the high voltage power battery and the second high pressure are female
Line；
DC charging relay on first high voltage bus and/or the second high voltage bus；And
Condition checkout gear described in any of the above.
Condition checkout gear of the present utility model and detection method are based on non-mechanical means and carry out state-detection, and detection is reliable
Property it is good, the degree of accuracy is high, and new mechanical breakdown will not be brought, moreover, being easy to the automatic state realized to DC charging relay
Detect, be simple to operate.
Brief description of the drawings
From described further below with reference to accompanying drawing, it will make above and other purpose and advantage of the present utility model more
It is complete clear, wherein, same or analogous key element, which is adopted, to be indicated by the same numeral.
Fig. 1 is the structural representation according to the DC charging system of the electric automobile of the embodiment of the utility model one.
Fig. 2 is DC charging relay S1 and S2, local equivalents circuit diagrams of the switch block S5 under various combinations of states.
Fig. 3 is the condition detection method flow chart according to the DC charging relay of the embodiment of the utility model one.
Embodiment
The utility model is more fully described now with reference to accompanying drawing, shown in the drawings of of the present utility model exemplary
Embodiment.But the utility model can be realized according to many different forms, and it is not construed as being limited to explaining here
The embodiment stated.On the contrary, thesing embodiments are provided so that the disclosure becomes thorough and complete, and conceive of the present utility model
Pass to those skilled in the art entirely.In accompanying drawing, identical label refers to identical element or part, therefore, will omit to it
Description.
Some block diagrams shown in accompanying drawing are functional entitys, not necessarily must be with physically or logically independent entity phase
It is corresponding.These functional entitys can be realized using software form, or in one or more hardware modules or integrated circuit
These functional entitys are realized, or these functions are realized in heterogeneous networks and/or processor device and/or microcontroller device
Entity.
Herein, electric automobile refers to provide driving electric automobile during traveling at least in part using high voltage power battery
Energy, electric automobile includes such as pure electric automobile and hybrid vehicle.Wherein, low pressure refers to the electricity of relative human-body safety
Pressure, e.g., less than or equal to 36V voltage, high pressure refer to the voltage of harm to the human body, are greater than 36V voltage.Electronic
It is high-voltage signal for driving the voltage of the motor of electric automobile, it is exported by high voltage power battery in automobile.
Fig. 1 show the structural representation of the DC charging system of the electric automobile according to the embodiment of the utility model one.
It is pointed out that signal gives the state-detection of the DC charging relay of the embodiment of the utility model one simultaneously in Fig. 1
Device, that is to say, that DC charging system 10 uses the condition checkout gear of the utility model embodiment.
As shown in figure 1, DC charging system 10 is installed on electric automobile, it is used for for the height on electric automobile
High voltage power battery 210 in piezoelectric battery bag 20 carries out DC charging.High voltage power battery 210 can be by many battery units
Formation has corresponding output voltage Vbatt.DC charging system 10 also has direct-current charging interface 120, and it is used to connect from outside
Enter direct current, for example, its can be connected in DC charging outside DC charging rifle etc..Direct-current charging interface 120 and high pressure
Electrokinetic cell 210 is to electrically connect and transmit electric power by high voltage bus, wherein, high voltage bus 110a is by direct-current charging interface 120
Positive pole and high voltage power battery 210 positive pole it is corresponding electrically connect, high voltage bus 110b by the negative pole of direct-current charging interface 120 and
The negative pole of high voltage power battery 210 is corresponding to be electrically connected.
Usually, corresponding high voltage power battery 210, on high voltage bus 110a and high voltage bus 110b is provided with also
Main relay S3 and main relay S4 are respectively arranged with, main relay S3 and main relay S4 can specifically be arranged on high-tension battery
In bag 20.
To control HVDC charging process, usually, it is necessary to be set on high voltage bus 110a and/or high voltage bus 110b
Put DC charging relay；When DC charging relay is in closure state, from the electric power of the access of direct-current charging interface 120
（Such as voltage Vport）Transmit to high voltage power battery 210 and it is charged；It is in DC charging relay and disconnects shape
During state, stop transmission electric power to high voltage power battery 210.Specifically, in one embodiment, it is female in high voltage bus 110a and high pressure
DC charging relay S1 and S2 are respectively arranged with line 110b；Under normal circumstances, it is plugged directly in direct-current charging interface 120
During current charge rifle, DC charging relay S1 and S2 closure, start to charge up；In DC charging rifle from direct-current charging interface 120
During extraction, DC charging relay S1 and S2 disconnect, and stop charging.
In view of failures such as " adhesions " may occur for DC charging relay S1 and S2 contact switch, need herein using this
The condition checkout gear of utility model embodiment detects whether DC charging relay is in predetermined state, is especially charging
At the end of, judge the whether normal off-state of DC charging relay.The condition checkout gear of DC charging relay is one
Determine to be referred to as " trouble-shooter " of DC charging relay in meaning.
Continue as shown in figure 1, condition checkout gear example is used for detecting DC charging relay S1 and S2 state, it is wrapped
Include with lower component：
The first line 120a between high voltage bus 110a and high voltage bus 110b is bridged, and on first line 120a
The resistance unit R1 and resistance unit R3 being disposed in series；
The second circuit 120b between high voltage bus 110a and high voltage bus 110b is bridged, and on the second circuit 120b
The resistance unit R2 and resistance unit R4 being disposed in series；
Switch block S5, its first end are electrically connected on the first line 120a between resistance unit R1 and resistance unit R3
（I.e. at point O1）, its second end is electrically connected on the second circuit 120a between resistance unit R2 and resistance unit R4（That is point O2
Place）；And
State obtaining widget, it is used to read the second end for representing switch block S5（I.e. at point O2）Voltage swing letter
Cease to judge that DC charging relay S1 and S2 distinguish state in which.
It is pointed out that first line 120a, the second circuit 120b and switch block S5 correspond to it is detected straight
Current charge relay S1 and S2 and set, that is to say, that DC charging relay S1 is arranged on first line 120a and second
Corresponding between circuit 120b on one section of high voltage bus 110a, DC charging relay S2 is arranged on first line 120a and second
Corresponding between circuit 120b on one section of high voltage bus 110b.
Specifically, resistance unit R1 first end is electrically connected to DC charging relay S1 close direct-current charging interface
120 one end, resistance unit R2 first end are electrically connected to the one of DC charging relay S1 close high voltage power battery 210
End；Resistance unit R3 first end is electrically connected to one end of DC charging relay S2 close direct-current charging interface 120, resistance
The first end of unit R 4 is electrically connected to one end of DC charging relay S2 close high voltage power battery 210；Resistance unit R1
The second end be electrically connected to resistance unit R3 the second end, be also electrically connected to switch block S5 first end, i.e. resistance unit R1
The second end, resistance unit R3 the second end and switch block S5 first end be electrically connected to point O1；The of resistance unit R2
Two ends are electrically connected to resistance unit R4 the second end, are also electrically connected to switch block S5 the second end, i.e. and the of resistance unit R2
Second end at two ends, resistance unit R4 the second end and switch block S5 is electrically connected to point O2.
It should be noted that resistance unit R1, resistance unit R2, resistance unit R3 and resistance unit R4 can be an electricity
It can also be that multiple resistance are formed to hinder formation, or the other elements with equivalent resistance are formed.
Specifically, switch block S5 can be that relay, optical coupled switch, field-effect transistor, triode etc. are various can
The high-voltage switch gear of control, its particular type are not restricted.When carrying out state-detection to DC charging relay S1 and S2, need
Controlling switch part S5 is wanted to be off or closure state, in one embodiment, switch block S5 disconnection and closure
The S5 control modules 151 of controlled device 150 are controlled to realize.
Continue as shown in figure 1, in one embodiment, the state obtaining widget of condition checkout gear passes through with lower component reality
It is existing：Bleeder circuit 130 and the resistance unit R5 being disposed in series thereon and resistance unit R6, isolation operational amplifier 140 and
Controller 150.
Specifically, one end of bleeder circuit 130 be electrically connected contact O2, the other end ground connection GND, point O2 voltage output Vf,
The resistance unit R5 and resistance unit R6 partial pressures to be connected, point O3 correspond to the connection between resistance unit R5 and resistance unit R6
Point, according to electric resistance partial pressure principle, voltage V corresponding to point O3f1=Vf× R6/ (R5+R6), it is inputted to isolation operational amplifier 140
An input, isolation operational amplifier 140 to voltage Vf1Handled to obtain output signal Vout；It is to be appreciated that should
The information V of readingoutActually correspond to the voltage swing at switch block S5 the second end, that is, the information of the reading is anti-
Reflect VfSize, therefore, the information V of the readingoutIt is the information of the voltage swing at the second end for representing switch block S5.
Isolate the output signal V of operational amplifier 140out, input to the analog-to-digital conversion module ADC 154 of controller 150,
Namely gathered by ADC 154, and transmit to the condition judgment module 155 of controller 150；Condition judgment module 155 can be to reading
The information taken carries out calculating processing, and its specific computation processing method will illustrate in specific embodiment below.
Accordingly, it is to be understood that bleeder circuit 130 and isolation operational amplifier 140 mainly constitute the reading of an embodiment
Take and represent the first end of the switch block S5 or the information of voltage V at the second endfOutput information VoutInformation of voltage read electricity
Road.The information of voltage reading circuit corresponds to point O2 and set, it is necessary to illustrate, the specific electricity of information of voltage reading circuit
Line structure is not limited to above example, for example, information of voltage reading circuit is also can correspond to point O1 and set.
It should be noted that it can also be multiple resistance that resistance unit R5 and resistance unit R6, which can be a resistance, which to be formed,
Formed, or the other elements with equivalent resistance are formed；Isolation operational amplifier 140, which has, acts on high_voltage isolation, prevents
The only low-pressure system residing for the high-pressure system damage grade of controller 150 residing for high voltage bus.Corresponding isolation operational amplifier 140,
Insulating power supply 141 can also be set, and it is used for the working power that low pressure is provided for the isolation grade low voltage component of operational amplifier 140
Vcc。
Continue as shown in figure 1, being additionally provided with S1 control modules 152 in controller 150（That is the first DC charging relay control
Molding block）With S2 control modules 153（That is the first DC charging relay control module）, S1 control modules 152 and S2 control mould
Block 153 can export the control unit that low current signal controls DC charging relay S1 and S2 respectively, and it is controlled so as to enabled
Contact switch on or off operation.Certainly, the situation for the failure that sticked together etc. in DC charging relay S1 or S2
Under, S1 control modules 152 or S2 are likely to normally drive DC charging relay S1 or S2 contact switch to be led
Logical or shut-off operation.
Continue as shown in figure 1, be additionally provided with condition judgment module 155 in controller 150, condition judgment module 155 by with
It is set to the output information V according to readingoutIt is compared with corresponding perfect condition coefficient p to judge DC charging relay S1
Off-state or closure state are presently at S2.Concrete form, the tool of perfect condition coefficient of the output information of reading
The condition detection method for combining the embodiment of the utility model one behind is carried out example and said by body form and specific comparison method
It is bright.
Specifically, controller 150 can be realized by microprocessor etc., and in one embodiment, it can be integrated in vehicle
Realized in control unit VCU or by full-vehicle control unit VCU, so, the shape that easily can be obtained controller 150
State feedback of the information gives full-vehicle control unit VCU, to facilitate progress next step action or facilitate user quickly to know that the state is believed
Breath, especially in the case where finding DC charging relay failure.
In one embodiment, the resistance unit R1 to R6 in condition checkout gear is illustratively set with such as following table one, isolated
The design parameter value of operational amplifier 140.
Table one
In the embodiment above, resistance unit R1-R4 selections are arranged to megaohm（Mohm）The resistance of level, so, is bridged
Electric current caused by first line 120a or the second circuit 120b between high voltage bus 110a and 110b will be very small, as far as possible
Ground reduces the influence to DC charging work.It is to be understood that resistance unit R1-R4 can also select to be arranged to bigger rank
Resistance, such as resistance more than mega-ohms.In another embodiment, it is necessary to which explanation, is bridged in high voltage bus to reduce
First line 120a or the second circuit 120b between 110a and 110b are in non-state-detection to DC charging or high voltage power
Battery discharge has an impact, and can set switch element respectively on first line 120a and the second circuit 120b（Do not show in figure
Go out）, the switch element is also arranged to control with controlled device 150；In state-detection, switch element closure, non-
During state-detection, the switch element disconnects.Switch element for example can be specifically relay, optical coupled switch, field-effect transistor,
The various controllable high-voltage switch gears such as triode.
Based on the design parameter setting with upper table 1, DC charging relay S1 and S2, switch block S5 can be calculated each
The corresponding information read of ADC154 under kind normal condition, it can be obtained as the above-described preferable shape for comparing in advance
State coefficient, as shown in following table two.
Table two
Wherein, VbattThe voltage of the output of high voltage power battery 210 is represented, it corresponds to be applied to high pressure in state-detection
Voltage signal between bus 110a and 110b；VoutRepresent the voltage signal that isolation operational amplifier 140 exports, Vout/ Vbatt
With 1000 × Vout/ VbattIt is the calculating process that example is carried out in condition judgment module 155, it, which is calculated, arrives for contrast judgement
Perfect condition coefficient（Such as 5.97 etc.）；, can also be according to the output information V of reading in succeeding state detection processout, base
Virtual condition coefficient is calculated in above calculating process.
Wherein, " 0 " represents that DC charging relay S1 and S2, switch block S5 are in normal off-state, and " 1 " represents
DC charging relay S1 and S2, switch block S5 are in normal closure state.
For convenience of understanding, Fig. 2 shows DC charging relay S1 and S2, switch block S5 under various combinations of states
Local equivalents circuit diagram.
Referring to Fig. 2 and table two, Fig. 2（a）Local equivalents circuit when corresponding S5, S1 and S2 disconnect, i.e., in corresponding table two
" 000 ", now, point O2 for V1.
Fig. 2（b）Local equivalents circuit when corresponding S5 and S1 is disconnected, S2 is closed, i.e. " 001 " in corresponding table two, this
When, point O2 for V2.
Fig. 2（c）Local equivalents circuit when corresponding S5 and S2 is disconnected, S1 is closed, i.e. " 010 " in corresponding table two, this
When, point O2 for V3.
Fig. 2（d）Local equivalents circuit when corresponding S5 disconnections, S1 and S2 are closed, i.e. " 011 " in corresponding table two, this
When, point O2 for V4.
Fig. 2（e）Local equivalents circuit when corresponding S5 closures, S1 and S2 disconnect, i.e. " 100 " in corresponding table two, this
When, point O2 for V5.
Fig. 2（f）Local equivalents circuit when corresponding S5 and S2 closures, S1 disconnections, i.e. " 101 " in corresponding table two, this
When, point O2 for V6.
Fig. 2（g）Local equivalents circuit when corresponding S5 and S1 closures, S2 disconnections, i.e. " 110 " in corresponding table two, this
When, point O2 for V7.
Fig. 2（h）Local equivalents circuit during corresponding S5, S1 and S2 closure, i.e. " 111 " in corresponding table two, now, point
O2 for V8.
Based on above equivalent circuit it was determined that when S5 disconnects, V1=V2=V3=V4, therefore, as the electricity for reading point O2
Press the output voltage V of the isolation operational amplifier 140 of information read circuitoutAll it is equal；When S5 is closed, V5 ≠ V6 ≠
V7 ≠ V8, therefore, the output voltage V as the isolation operational amplifier 140 for the information of voltage reading circuit for reading point O2outAll
Differ.
From table two, it can be seen that, these different information of voltage can be from DC charging relay S1 and S2 different shapes
State combination is corresponding, above-described perfect condition coefficient can be calculated based on these information of voltage, for succeeding state
Judgement is compared in detection process.For example, during state for detecting two DC charging relays S1 and S2, defining ideal shape
State coefficient includes four, i.e. p1=5.97（It is to calculate to obtain based on V5）、p2=4.53（It is to calculate to obtain based on V6）、p3=
9.06（It is to calculate to obtain based on V7）With p4=7.29（It is to calculate to obtain based on V8）.
It should be noted that, it is necessary to the perfect condition being obtained ahead of time during the number difference of the DC charging relay of detection
Coefficient is different, if for example, only detecting DC charging relay S1 state, then the DC charging relay in Fig. 1
S2 can be considered as to be turned on all the time, and the above perfect condition coefficient p2 and p4 is obtained ahead of time.
It will be appreciated that with reference to the equivalent circuit diagram of figure 2 above, resistance unit R1 to R4 resistance value can be set, so that
DC charging relay S1 and S2 can be distinguished reciprocally under different conditions combination between corresponding multiple perfect condition coefficients,
Be advantageous to improve the accuracy in follow-up comparison, deterministic process.
It should be noted that " perfect condition coefficient " of the present utility model is to be based on condition checkout gear of the present utility model
In detected DC charging relay normally（Or in the case of not breaking down）Accordingly obtained under a certain state, its
The state of DC charging relay is effectively distinguished to the differentiation corresponded to numerically, it is fast to be advantageous to follow-up state-detection process
Speed, the current state for accurately, easily obtaining DC charging relay.
Fig. 3 is combined in detail below to illustrate the condition detection method process of the condition checkout gear shown in Fig. 1.
In one embodiment, before state-detection, start to the DC charging of high voltage power battery 210, insert DC charging
Rifle closes in direct-current charging interface 120, high pressure main relay S3, S4, meanwhile, the control DC charging relay of controller 150 S1,
S2 is closed, and DC charging loop is formed, and starts DC charging.
Referring to Fig. 3 step S310, DC charging terminates, and after pulling out DC charging rifle, starts following condition detection method process
Realize and state-detection is carried out to DC charging relay S1, S2, to detect whether DC charging relay S1, S2 stick together
Failure.
Further, the voltage being applied between high voltage bus 110a and 110b is read, the voltage is used in follow-up state and examined
During survey；In one embodiment, directly with the output voltage V of high voltage power batterybattAs high voltage bus 110a and 110b
Between voltage.
Specifically, referring to Fig. 3 step S320, DC charging relay S1, S2 is kept to be in closure state, it is certainly, high
Pressure main relay S3 and S4 are also at closure state, and now, switch block S5 is off, and read now VoutVoltage
Value Vout1, understood based on table two, V out1=0.00597Vbatt, therefore, calculate Vbatt=V out1/0.00597.Above direct current fills
Electrical relay S1, S2 closure control, switch block S5 disconnection control can be completed by controller 150.
Further, referring to Fig. 3 step S330, closed by the controlling switch part S3 of controller 150 and control direct current
Charge relay S1 and S2 disconnect, and read now VoutMagnitude of voltage Vout2.It will be understood that if DC charging relay S1 and S2
It is normally open, then desired result should be that condition judgment module 155 corresponding to " 100 " is based on relational expression in table two
1000*Vout/VbattThe coefficient 5.97 being calculated, i.e., corresponding perfect condition coefficient is p1=5.97.
Further, referring to Fig. 3 step S340, according to the V measured twiceout1And Vout2, based on relational expression 1000*Vout/
VbattVirtual condition COEFFICIENT K is calculated, specific calculating process is as follows：
K=1000*Vout/Vbatt=1000*Vout2/Vbatt=5.97V out2/V out1。
Above calculating process can be completed by the condition judgment module 155 in controller 150.
Further, referring to Fig. 3 step S350, be calculated as above obtained virtual condition COEFFICIENT K and perfect condition coefficient p1=
5.97 contrasted；It is if equal（Such as error is between ± 0.5）, into step S360, determine DC charging relay S1
It is off with S2, i.e., the failure such as do not stick together；If unequal, represent to break down（For example, in S1 and S2
It is at least one that there occurs adhesion）, into step S370, judge whether virtual condition COEFFICIENT K is equal in other perfect condition coefficients
Some, that is, with other perfect condition coefficients in table two（Such as p2=4.53, p3=9.06, p4=7.29）Carry out pair
Than；If it is determined that it is equal with a certain perfect condition coefficient, into step S380, determine that S1 and S2 is in the perfect condition coefficient pair
The normal condition answered, if for example, virtual condition COEFFICIENT K=p2, then it represents that S1 and S2 are currently respectively at off-state and closure
Adhesion fault be present in state, DC charging relay S2；If virtual condition COEFFICIENT K=p3, then it represents that S2 and S1 currently locates respectively
In off-state and closure state, there is adhesion fault in DC charging relay S1；If virtual condition COEFFICIENT K=p4, then it represents that
Currently adhesion fault be present all in closure state, DC charging relay S1 and S2 in S1 and S2.
Above step S340 to step S380 is completed by the condition judgment module 155 in controller 150.
Therefore, the condition detection method of above example can not only detect to obtain the current of DC charging relay S1 and S2
State, and fault diagnosis can be carried out.The condition checkout gear and condition detection method of above example are to be based on on-mechanical
Mode carries out state-detection, and detection good reliability, the degree of accuracy are high, and will not bring new mechanical breakdown.Moreover, it is easy to automatic reality
The now state-detection to DC charging relay, simple to operate.
It is pointed out that in the condition checkout gear and condition detection method of above example, as shown in figure 1, being to make
With the output voltage V of high voltage power batterybattState-detection is carried out to be applied on high voltage bus 110a and 110b；But it should
It is understood that in other alternative embodiments, can also be applied to using other dc sources on high voltage bus 110a and 110b
State-detection is carried out, for example, using Vport, now, main relay S3 and main relay S4 disconnect, correspondingly, state acquisition unit
Part can read the first end for representing switch block S5（I.e. at point O1）Voltage swing information, for example, bleeder circuit 130
One end is electrically connected to point O1, and other parts make identical arrangement, and state-detection principle is also essentially identical, no longer goes to live in the household of one's in-laws on getting married one by one herein
State.
It should be noted that the condition checkout gear of above example is not limited to applied to the utility model embodiment
In the DC charging system of electric automobile, it is also applied to beyond automobile and is used for high voltage power battery progress DC charging
DC charging system in.
It will be understood that hereinbefore, when it is said that part ' attach ' into another part, it can be directly connected to another
Individual part may have intermediate member.
Example above primarily illustrates condition checkout gear and its state inspection of DC charging relay of the present utility model
Survey method including the condition checkout gear DC charging system.Although only some of embodiments of the present utility model are entered
Gone description, but those of ordinary skill in the art it is to be appreciated that the utility model can without departing from its spirit with scope in
Implemented in the form of many other.Therefore, the example shown is considered as illustrative and not restrictive with embodiment,
In the case of not departing from the utility model spirit and scope as defined in appended claims, the utility model may be covered
Various modifications and replacement.
Claims (9)
- A kind of 1. DC charging relay（S1, S2）Condition checkout gear, wherein, the DC charging relay（S1, S2） It is arranged on DC charging loop（100）On the first high voltage bus（110a）And/or second high voltage bus（110b）On；It is special Sign is that the condition checkout gear includes：Bridge joint is in the first high voltage bus（110a）With the second high voltage bus（110b）Between first line（120a）, described first Circuit（120a）On be disposed in series first resistor unit（R1）With 3rd resistor unit（R3）；Bridge joint is in the first high voltage bus（110a）With the second high voltage bus（110b）Between the second circuit（120b）, described second Circuit（120b）On be disposed in series second resistance unit（R2）With the 4th resistance unit（R4）；Switch block（S5）, its first end is electrically connected to the first resistor unit（R1）With the 3rd resistor unit（R3）It Between first line（120a）On, its second end is electrically connected to the second resistance unit（R2）With the 4th resistance unit（R4）It Between the second circuit（120a）On；AndState obtaining widget, it, which is used to read, represents the switch block（S5）First end or the second end information of voltage letter Cease to judge the DC charging relay（S1, S2）State in which；Wherein, the DC charging relay（S1, S2）It is arranged on the first line（120a）With second circuit （120b）Between corresponding to one section of first high voltage bus（110a）And/or second high voltage bus（110b）On.
- 2. condition checkout gear as claimed in claim 1, it is characterised in that the first resistor unit（R1）, second resistance Unit（R2）, 3rd resistor unit（R3）With the 4th resistance unit（R4）For resistance more than mega-ohms or mega-ohms.
- 3. condition checkout gear as claimed in claim 1 or 2, it is characterised in that the first resistor unit（R1）, second electricity Hinder unit（R2）, 3rd resistor unit（R3）With the 4th resistance unit（R4）Resistance value it is equal.
- 4. condition checkout gear as claimed in claim 1, it is characterised in that in the first line（120a）With described second Circuit（120b）It is upper that switch element is set respectively, when carrying out state-detection, the switch element closure, examined without state During survey, the switch element disconnects.
- 5. condition checkout gear as claimed in claim 1, it is characterised in that the state obtaining widget includes：Information of voltage reading circuit, it, which is used to read, represents the switch block（S5）First end or the second end information of voltage （Vf）Output information（Vout）；WithCondition judgment module, it is used for the output information according to reading（Vout）It is compared and with corresponding perfect condition coefficient Judge the DC charging relay（S1, S2）It is presently at off-state or closure state；Wherein, the perfect condition coefficient is based in the DC charging relay（S1, S2）Normally it is off The lower or normal output information read in the information of voltage reading circuit under closure state（Vout）To obtain in advance.
- 6. condition checkout gear as claimed in claim 5, it is characterised in that the information of voltage reading circuit includes：Bleeder circuit（130）, its first end electrical connection switch block（S5）First end or the second end, its second termination Ground, wherein, the bleeder circuit（130）On be disposed in series the 5th resistance unit for partial pressure（R5）With the 6th resistance list Member（R6）；WithIsolate operational amplifier（140）, one input end is electrically connected to the 5th resistance unit（R5）With the 6th resistance unit （R6）Between bleeder circuit（130）On.
- 7. condition checkout gear as claimed in claim 6, it is characterised in that the state obtaining widget also includes：From described Isolate operational amplifier（140）Output end collection information and the information of collection is carried out to the analog-to-digital conversion module of analog-to-digital conversion （154）.
- 8. condition checkout gear as claimed in claim 5, it is characterised in that the DC charging relay（S1, S2）Including It is respectively set at first high voltage bus（110a）With second high voltage bus（110b）On the first DC charging after Electrical equipment（S1）With the second DC charging relay（S2）.
- A kind of 9. DC charging system of electric automobile（10）, it is used for high voltage power battery（210）DC charging is carried out, its It is characterised by, including：Direct-current charging interface（120）；By the direct-current charging interface（120）With the high voltage power battery（210）First high voltage bus of electrical connection（110a） With the second high voltage bus（110b）；First high voltage bus（110a）And/or second high voltage bus（110b）On DC charging relay（S1, S2）；AndCondition checkout gear as any one of claim 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720367879.2U CN206865159U (en) | 2017-04-10 | 2017-04-10 | Condition checkout gear, the DC charging system of DC charging relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720367879.2U CN206865159U (en) | 2017-04-10 | 2017-04-10 | Condition checkout gear, the DC charging system of DC charging relay |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206865159U true CN206865159U (en) | 2018-01-09 |
Family
ID=60816451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720367879.2U Withdrawn - After Issue CN206865159U (en) | 2017-04-10 | 2017-04-10 | Condition checkout gear, the DC charging system of DC charging relay |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206865159U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106911160A (en) * | 2017-04-10 | 2017-06-30 | 上海蔚来汽车有限公司 | The condition checkout gear and its method of DC charging relay, DC charging system |
| CN110875611A (en) * | 2018-08-30 | 2020-03-10 | 宁德时代新能源科技股份有限公司 | Charging circuit and control method thereof |
-
2017
- 2017-04-10 CN CN201720367879.2U patent/CN206865159U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106911160A (en) * | 2017-04-10 | 2017-06-30 | 上海蔚来汽车有限公司 | The condition checkout gear and its method of DC charging relay, DC charging system |
| CN106911160B (en) * | 2017-04-10 | 2023-10-17 | 上海蔚来汽车有限公司 | State detection device and method of direct-current charging relay and direct-current charging system |
| CN110875611A (en) * | 2018-08-30 | 2020-03-10 | 宁德时代新能源科技股份有限公司 | Charging circuit and control method thereof |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 201804 room 115, 569 Anchi Road, Anting Town, Jiading District, Shanghai Patentee after: Weilai Holdings Ltd. Address before: 201804 room 115, No. 569, Anchi Road, Anting Town, Jiading District, Shanghai Patentee before: NIO Co.,Ltd. |
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| CU01 | Correction of utility model | ||
| CU01 | Correction of utility model |
Correction item: Patentee Correct: NIO Co.,Ltd. False: Weilai Holdings Ltd. Number: 27-01 Volume: 39 |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20180109 Effective date of abandoning: 20231017 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20180109 Effective date of abandoning: 20231017 |