CN106712234A - Current overcurrent protection circuit, bidirectional charger and electric automobile - Google Patents
Current overcurrent protection circuit, bidirectional charger and electric automobile Download PDFInfo
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- CN106712234A CN106712234A CN201710102290.4A CN201710102290A CN106712234A CN 106712234 A CN106712234 A CN 106712234A CN 201710102290 A CN201710102290 A CN 201710102290A CN 106712234 A CN106712234 A CN 106712234A
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- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 61
- 230000005611 electricity Effects 0.000 claims description 10
- 230000008859 change Effects 0.000 claims description 4
- 230000000052 comparative effect Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 abstract description 6
- 238000005070 sampling Methods 0.000 abstract 1
- 239000004065 semiconductor Substances 0.000 description 22
- 238000010586 diagram Methods 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
-
- H02J7/0021—
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- H02J7/0026—
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
-
- 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
-
- 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
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
-
- 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
- Y02T10/72—Electric energy management in electromobility
-
- 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
- Y02T90/14—Plug-in electric vehicles
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a current overcurrent protection circuit, a bidirectional charger and an electric vehicle, and relates to the technical field of motor control, wherein the current overcurrent protection circuit comprises: a comparison limit value providing unit for providing the upper and lower limit values of the voltage when the bidirectional charger is in a charging mode and the upper and lower limit values of the voltage when the bidirectional charger is in an inversion mode; the switch selection unit is connected with the voltage output end of the comparison limit value providing unit and is used for selectively outputting the upper limit value and the lower limit value of the voltage of the charging mode or the upper limit value and the lower limit value of the voltage of the inversion mode according to the working mode of the bidirectional charger; and the comparison unit is used for comparing the alternating current sampling signal with the upper limit value and the lower limit value of the voltage in the charging mode or the upper limit value and the lower limit value of the voltage in the inversion mode. The scheme of the invention realizes that whether the over-current phenomenon exists in the positive half cycle and the negative half cycle of the current is monitored simultaneously; frequent turn-off and turn-on of the MOS tube are avoided; and the limit value of the monitoring current is distinguished when the charging power and the inversion power are different.
Description
Technical field
The invention belongs to the motor control technology field of electric automobile, more particularly, to a kind of overcurrent protection circuit,
Bidirectional charger and electric automobile.
Background technology
Vehicle-mounted bidirectional charger for electric automobile is that one kind can change energy between power network and electric automobile power battery
Device, with from power network 220V/50Hz AC powers obtain energy, be that electric automobile inner high voltage electrokinetic cell is charged
Function, and the energy of electric automobile inner high voltage electrokinetic cell is converted into 220V/50Hz alternating currents, with drive AC load or
It is the function of being charged between the electrokinetic cell of other electric automobiles.
Vehicle-mounted bidirectional charger topological structure is as shown in figure 1, either charge function or inversion function, it is necessary to pass through
Certain control algolithm control tetra- metal-oxide-semiconductors of Q1-Q4 realize the conversion of energy, and tetra- metal-oxide-semiconductors of Q1-Q4 terminate energy when all off
Amount conversion.
In the prior art, control tetra- metal-oxide-semiconductors of Q1-Q4 realize energy conversion algorithm there are the following problems, restriction is compared
Limit value circuit only provides single comparing limit value, therefore comparison circuit can only be to alternating current sampled signal as shown in Figure 2
The overcurrent protection of positive half period is carried out, there is no protective capability for the excessively stream of negative half-cycle, as shown in Figure 3；Single comparing limit
Whether alternating current when value cannot monitor the situation that bidirectional charger charge power and inverter power differ has over-current phenomenon avoidance,
As shown in Figure 5；After over current fault occurs in bidirectional charger, tetra- metal-oxide-semiconductors of Q1-Q4 are immediately turned off, while the exchange of collection is adopted
Sample signal is less than and compares limit value, therefore tetra- metal-oxide-semiconductors of Q1-Q4 are turned on immediately, because over current fault is not removed, therefore can be caused
Tetra- metal-oxide-semiconductors of Q1-Q4 are frequently turned off, turned on, as shown in figure 4, so that tetra- metal-oxide-semiconductors of Q1-Q4 have the risk of bombing.
The content of the invention
It is an object of the invention to provide a kind of AC overcurrent protection circuit, bidirectional charger and automobile, so as to solve existing
In the case of having overcurrent protection circuit in technology charge power and inverter power cannot being differed, difference monitoring alternating current
The limit value of stream.
To achieve these goals, the invention provides a kind of AC overcurrent protection circuit, the double of electric automobile are connected to
In to the drive circuit of charger, including：
Compare limit value and unit, including at least four voltage output ends are provided；Wherein first voltage output end and second voltage
Upper voltage limit value and voltage lower limit value when output end institute output voltage is respectively the bidirectional charger in charge mode, the
Electricity when three voltage output ends and the 4th voltage output end institute output voltage are respectively the bidirectional charger in inverter mode
Pressure higher limit and voltage lower limit value；
Switch selecting unit, including two output ends and for being input into the sign signal of pattern residing for bidirectional charger the
One input, when the first input end is input into the sign signal for charge mode, the switch selecting unit is used to make
Two output ends are turned on the first voltage output end and second voltage output end respectively；When the first input end is input into
During sign signal during for inverter mode, the switch selecting unit is used to make two output ends defeated with the tertiary voltage respectively
Go out end and the conducting of the 4th voltage output end；
Comparing unit, including for the voltage output end with the alternating current sample circuit of bidirectional charger to be connected second
Input, the 3rd input and the 4th input that are connected with two output ends of the switch selecting unit respectively, the ratio
It is used to be compared the voltage on second input with the voltage on the 3rd input and the 4th input compared with unit
Compared with comparative result being exported by output end to the drive signal output unit of bidirectional charger.
Wherein, the limit value offer unit that compares includes first voltage input and second voltage input, wherein described
The magnitude of voltage of the magnitude of voltage more than second voltage input input of first voltage input input, and the first voltage is defeated
Enter series connection between end and the second voltage input and be equipped with multiple divider resistances, the voltage output end and two of which phase
Node connection between adjacent divider resistance.
Wherein, it is described to compare between each described voltage output end and the second voltage input that limit value provides unit
Electric capacity is equipped with respectively.
Wherein, the switch selecting unit includes a sectional pressure element, one end of the sectional pressure element and the described first input
End connection, other end grounding connection.
Wherein, the output end of second input and comparing unit is equipped with low-pass filter circuit respectively.
Wherein, the switch selecting unit includes comparing sub-circuit and at least four switch sub-circuits, the sub- electricity of comparing
Road includes an input and an output end, wherein the input for comparing sub-circuit is formed as the of the switch selecting unit
When one input, sign signal when first input end input is for charge mode, output end output first compares
Relatively it is worth；When the sign signal of first input end input for inverter mode, the output end exports the second fiducial value；
The wherein control end of the control end of first switch sub-circuit and second switch sub-circuit and the sub-circuit that compares
Output end is connected, and the control end of the control end of the 3rd switch sub-circuit and the 4th switch sub-circuit compares the defeated of sub-circuit with described
Enter end connection；The input of the first switch sub-circuit is connected with the first voltage output end, the second switch electricity
The input on road is connected with the second voltage output end, and the input of the 3rd switch sub-circuit is defeated with the tertiary voltage
Go out end connection, the input of the 4th switch sub-circuit is connected with the 4th voltage output end；And first switch
The output end of the output end of circuit and the 3rd switch sub-circuit is connected with the first output end of the switch selecting unit, institute
State the output end of second switch sub-circuit and the output end and the second of the switch selecting unit of the 4th switch sub-circuit
Output end is connected；
During sign signal when first input end input is for charge mode, the first switch sub-circuit and the
It is in closure state between the input and output end of two switch sub-circuits, the 3rd switch sub-circuit and the 4th switchs sub-circuit
Input and output end between in off-state disconnect；When the first input end input for inverter mode when sign letter
Number when, be in off-state, described the between the first switch sub-circuit and the input and output end of second switch sub-circuit
It is in closure state between three switch sub-circuits and the input and output end of the 4th switch sub-circuit.
Wherein, the comparing unit includes first comparator and the second comparator, wherein, the one of the first comparator is defeated
Enter end to be connected with the second input of the comparing unit respectively with an input of second comparator；Described first compares
Another input of device is connected with the 3rd input；Another input of second comparator and the 4th input
Connection；And the output end of the first comparator is connected with the output end of second comparator, is formed as the comparing unit
Output end.
Wherein, the output end of the comparing unit passes through the drive signal output unit of latch and the bidirectional charger
Connection.
Wherein, the latch include the 5th input be connected with the output end of the comparing unit, for being input into pair
It is and defeated with what the drive signal output unit was connected to the 6th input of the sign signal of working condition residing for charger
Go out end；When the bidirectional charger breaks down, the latch is used to latch fault-signal, makes the drive signal defeated
Go out unit output invalid signals.
Present invention also offers a kind of bidirectional charger, including overcurrent protection circuit as described above.
Present invention also offers a kind of electric automobile, including bidirectional charger as described above.
Above-mentioned technical proposal of the invention at least has the advantages that：
Limit value of the prior art is compared offer unit and is improved by the present invention, by calculating the suitable partial pressure electricity of selection
Resistance, so as to provide voltage upper limit value and lower limit value when bidirectional charger is in charge mode and during inverter mode for comparing unit
Voltage upper limit value and lower limit value, realizes monitoring the positive half period of alternating current and the AC overcurrent phenomenon of negative half-cycle simultaneously；By in limit
Value to compare and increase switch selecting unit between offer unit and comparing unit, the difference of the mode of operation according to bidirectional charger,
Realize the alternating current over-current phenomenon avoidance of monitoring charge mode, or the alternating current over-current phenomenon avoidance for monitoring inverter mode；By than
Compared with latch is increased between unit and drive signal output unit, realize when there is over-current phenomenon avoidance, the latch is by failure
Signal latch, makes drive signal output unit export invalid drive signal and gives Q1-Q4 tetra- metal-oxide-semiconductors, until fault clearance, from
And avoid tetra- metal-oxide-semiconductors of Q1-Q4 from frequently switching off and on.
Brief description of the drawings
Fig. 1 is the topological structure schematic diagram of bidirectional charger；
Fig. 2 is the alternating current sampled signal waveform schematic diagram of alternating current sample circuit output；
Fig. 3 is the schematic diagram that compares with single limit value of alternating current sampled signal of prior art；
Fig. 4 is the schematic diagram that prior art causes Q1-Q4 frequently to switch off and on；
Fig. 5 is the schematic diagram of prior art no-reverse change overcurrent protection function；
Fig. 6 is the schematic diagram for comparing limit value of the invention；
Fig. 7 is the truth table of latch of the invention；
Fig. 8 is the schematic diagram of overcurrent protection circuit of the invention.
Description of reference numerals：
1- limit values compare offer unit, 2- switch selecting units, 3- comparing units, 5- drive signal output units, R1-
One resistance, R2- second resistances, R3- 3rd resistors, the resistance of R4- the 4th, the resistance of R5- the 5th, the resistance of R6- the 6th, U1- phase inverters,
U2- analog switch chips, U31- first comparators, the comparators of U32- second, U4- latch, U5- singlechip chips.
Specific embodiment
To make the technical problem to be solved in the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and tool
Body embodiment is described in detail.
As shown in figure 8, one embodiment of the invention provides a kind of overcurrent protection circuit, including：Compare limit value to carry
For unit 1, switch selecting unit 2, comparing unit 3, latch U4 and drive signal output unit 5.
The limit value offer unit 1 that compares includes first voltage input and second voltage input, wherein described first
The magnitude of voltage of the magnitude of voltage more than second voltage input input of voltage input end input, and the first voltage input
Series connection is equipped with multiple divider resistances selected after calculating and the second voltage input between, and the limit value that compares is carried
It is used to provide the voltage upper limit value and lower limit value of the alternating current overcurrent protection that bidirectional charger is in charge mode and in inverse for unit
The voltage upper limit value and lower limit value of the alternating current overcurrent protection of change pattern.
It is described compare limit value unit 1 be provided also include at least four voltage output ends, wherein first voltage output end and the
Node connection between one resistance R1 and second resistance R2, the voltage of output is voltage when bidirectional charger is in charge mode
Higher limit；Node connection between second voltage output end and the 4th resistance R4 and the 5th resistance R5, the voltage of output is two-way
Charger is in voltage lower limit value during charge mode；Between tertiary voltage output end and second resistance R2 and 3rd resistor R3
Node is connected, and the voltage of output is upper voltage limit value when bidirectional charger is in inverter mode；4th voltage output end and
Node connection between three resistance R3 and the 4th resistance R4, the voltage of output is voltage when bidirectional charger is in inverter mode
Lower limit.
Each voltage output end is equipped with filter capacitor between second voltage input respectively, so that the electricity
The magnitude of voltage of pressure output end output is more stablized.
The switch selecting unit 2 includes comparing sub-circuit and at least four switch sub-circuits.
Wherein, it is described compare sub-circuit including a phase inverter U1, provided for the phase inverter voltage power supply and
It is connected to the sectional pressure element between the input of the phase inverter U1 and earth terminal.The input of the phase inverter U1 is opened for described
Close the first input end of select unit, the sign signal for being input into pattern residing for bidirectional charger；The sectional pressure element is the
Six resistance R6, for carrying out voltage division processing to the abnormal voltage that the first input end is input into.
At least four switch sub-circuits in the switch selecting unit can be analog switch chip U2, relay, crystalline substance
Body pipe or metal-oxide-semiconductor.
By taking analog switch chip U2 as an example, as shown in figure 8, analog switch chip U2 inside includes four switch electricity
Road, each switch sub-circuit includes a control end, an input and an output end, and control letter is input into by the control end
Number, make the input and output end closure or disconnect.
Wherein, the control end of the control end of first switch sub-circuit and second switch sub-circuit and the sub-circuit that compares
Output end is connected, and the control end of the control end of the 3rd switch sub-circuit and the 4th switch sub-circuit compares the defeated of sub-circuit with described
Enter end connection；The input of the first switch sub-circuit is connected with the first voltage output end, the second switch electricity
The input on road is connected with the second voltage output end, and the input of the 3rd switch sub-circuit is defeated with the tertiary voltage
Go out end connection, the input of the 4th switch sub-circuit is connected with the 4th voltage output end；And first switch
The output end of the output end of circuit and the 3rd switch sub-circuit is connected with the first output end of the switch selecting unit, institute
State the output end of second switch sub-circuit and the output end and the second of the switch selecting unit of the 4th switch sub-circuit
Output end is connected.
When the first input end input for inverter mode when sign signal when, the output end for comparing sub-circuit
The first fiducial value is exported, the first input end is input into control end and fourth of the control signal to the described 3rd switch sub-circuit
Switch sub-circuit control end, make it is described 3rd switch sub-circuit and the 4th switch sub-circuit input and output end between be in
Closure state；The output end for comparing sub-circuit exports the first fiducial value to the first switch sub-circuit and second switch
The control end of sub-circuit, makes between the first switch sub-circuit and the input and output end of second switch sub-circuit in disconnection
State disconnects；When the first input end input for charge mode when sign signal when, the first input end will be with institute
State charge mode and characterize the corresponding control signal of signal and be sent to the 3rd switch sub-circuit and the 4th switch sub-circuit
Control end, makes between the 3rd switch sub-circuit and the input and output end of the 4th switch sub-circuit in off-state；Institute
State and compare the output end of sub-circuit the second fiducial value is transferred to the control of the first switch sub-circuit and second switch sub-circuit
End processed, makes to be in closure state between the first switch sub-circuit and the input and output end of second switch sub-circuit.
The comparing unit 3 includes first comparator U31 and the second comparator U32, wherein, the first comparator
The inputs of U31 mono- are connected with the second input of the comparing unit respectively with an input of the second comparator U32；Institute
Another input for stating first comparator U31 is connected with the 3rd input；Another input of the second comparator U32
It is connected with the 4th input；And the output end of the first comparator U31 connects with the output end of the second comparator U32
Connect, be formed as the output end of the comparing unit 3.
Wherein, second input is used to connect with the voltage output end of the alternating current sample circuit of bidirectional charger
Connect；3rd input is connected with the first output end of the switch selecting unit 2；4th input and the switch
The second output end connection of select unit 2；The comparing unit 3 is used for the voltage on second input and the described 3rd
Voltage on input and the 4th input is compared, by comparative result by the output end of the comparing unit 3 export to
The drive signal output unit 5 of bidirectional charger.
Wherein, low-pass filter circuit is equipped with respectively in the output end of second input and the comparing unit, use
More stablize in the input voltage value and the output voltage values are made.
As shown in figure 8, the output end of the comparing unit 3 passes through the drive signal of latch U4 and the bidirectional charger
Output unit 5 is connected.
Wherein, the latch U4 include be connected with the output end of the comparing unit 3 the 5th input, for being input into
6th input of the sign signal of working condition residing for bidirectional charger, and be connected with the drive signal output unit 5
Output end；When the bidirectional charger breaks down, the latch U4 is used to latch fault-signal, by controlling to drive
Dynamic signal output unit 5, makes drive signal output unit 5 export invalid signals, so that the bidirectional charger stops energy
Conversion.
The drive signal output unit 5 includes a singlechip chip U5, and the Enable Pin with the singlechip chip U5 connects
The metal-oxide-semiconductor Q20 for connecing.The output end of the latch U4 is connected with the grid of the metal-oxide-semiconductor Q20, by the latch U4's
The magnitude of voltage of output end output controls the disconnection or conducting of the metal-oxide-semiconductor Q20, so as to export invalid or effective drive signal.
Wherein, the input of the singlechip chip U5 connects with the output end of the singlechip chip of bidirectional charger respectively
Connect；The output end of the singlechip chip U5 is connected with the grid of tetra- metal-oxide-semiconductors of the Q1-Q4 respectively by second level driver element
Connect.
Overcurrent protection circuit of the invention is described in the overcurrent protection circuit after electricity in concrete application
Compare voltage upper limit value and lower limit value and the voltage upper limit value and lower limit value of inverter mode that limit value provides the charge mode of the output stabilization of unit 1,
As shown in fig. 6, when the sign signal of first input end input for charge mode, the first switch sub-circuit and the
The input of two switch sub-circuits and output end conducting, make first voltage output end and the institute of output charge mode upper voltage limit value
The 3rd input conducting of comparing unit is stated, the second voltage output end of output charge mode voltage lower limit value is compared with described
The 4th input conducting of unit；Second input is input into the alternating current sampled signal EXT-AI-Iac, the ratio
Compared with unit 3 by the upper voltage limit value and voltage lower limit value of the alternating current sampled signal EXT-AI-Iac and the charge mode
It is compared.
If the alternating current sampled signal EXT-AI-Iac is located at the upper voltage limit value and lower limit of the charge mode
Between, then there is no over current fault in the bidirectional charger, and the output end of the comparing unit 3 exports a high level, i.e., and its
5th input of the latch U4 of connection is input into a high level, so that the output end output one of the latch U4 is high
Level, turns on the metal-oxide-semiconductor Q20, so that the Enable Pin of the singlechip chip U5 is low level, exports drive signal
Unit 5 exports effective drive signal, turns on tetra- metal-oxide-semiconductors of Q1-Q4.
If the bidirectional charger occurs over current fault, the alternating current sampled signal EXT-AI-Iac is not described
Between the upper voltage limit value and lower limit of charge mode, then the output end of the comparing unit 3 exports a low level, so that with
5th input of its connection is input into a low level, and latch truth table as shown in Figure 7, the output end of the latch U4 is defeated
Go out a low level, so that the metal-oxide-semiconductor Q20 is turned off, make the Enable Pin of the singlechip chip U5 for high level, finally make drive
Dynamic signal output unit 5 exports invalid drive signal, turns off tetra- metal-oxide-semiconductors of Q1-Q4, so as to stop the bidirectional charger
Energy conversion.
Work as failure vanishes, when the 5th input is high level, because the 6th input is always low level, therefore institute
The output end for stating latch U4 is output as the low level for latching, and the drive signal of the output of drive signal output unit 5 is still
It is invalid, so as to avoid tetra- metal-oxide-semiconductors of Q1-Q4 from frequently switching off and on；When the single-chip microcomputer of bidirectional charger confirms AC overcurrent event
After barrier is removed, a rising edge is input into the 6th input, shown in truth table as shown in Figure 7, releases and over current fault is believed
Number latch, drive signal output unit 5 is exported effective drive signal and give Q1-Q4 tetra- metal-oxide-semiconductors.
When bidirectional charger is in inverter mode, the 3rd switch sub-circuit and the 4th switch sub-circuit are led
It is logical, the alternating current sampled signal EXT-AI-Iac is compared with the voltage upper limit value and lower limit value of inverter mode, finally make drive
Dynamic signal output unit 5 exports effective or invalid drive signal and gives Q1-Q4 tetra- metal-oxide-semiconductors.
The above embodiment of the present invention, by selecting suitable divider resistance value, so that the limit value that compares provides single
Unit 1 can provide the voltage upper limit value and lower limit value of charge mode and the voltage upper limit value and lower limit value of inverter mode；By increasing switch selection
Unit 2, when the bidirectional charger is in charge mode, the first voltage output end and the second voltage output end are divided
It is not connected with the 3rd input of the comparing unit and the 4th input；When the bidirectional charger is in inverter mode,
The tertiary voltage output end and the 4th voltage output end are defeated with the 3rd input of the comparing unit 3 and the 4th respectively
Enter end connection；It is achieved thereby that the current limliting over current fault of charge mode can be monitored, the current limliting excessively stream of inverter mode can be monitored again
Failure.Two comparators are set to by by comparing unit 3, it is achieved thereby that monitoring alternating current positive half period and negative half simultaneously
The over-current phenomenon avoidance in cycle, shortens the time of alternating current overcurrent protection response.Exported by comparing unit 3 and drive signal
Increase latch U4 between unit 5, it is to avoid tetra- metal-oxide-semiconductors of Q1-Q4 are frequently turned off, turned on, it is to avoid the generation of blasted pipe phenomenon.
Present invention also offers a kind of bidirectional charger, including overcurrent protection circuit as described above.
It is corresponding to be applied on bidirectional charger due to the overcurrent protection circuit of the embodiment of the present invention, therefore, this hair
Bright embodiment additionally provides a kind of bidirectional charger, wherein, realize that embodiment is applicable described in above-mentioned overcurrent protection circuit
In the embodiment of the bidirectional charger, identical technique effect can be also reached.
Present invention also offers a kind of electric automobile, including bidirectional charger as described above.
It is corresponding to be applied on electric automobile due to the bidirectional charger of the embodiment of the present invention, therefore, the embodiment of the present invention
A kind of electric automobile is additionally provided, wherein, realize embodiment suitable for the reality of the electric automobile described in above-mentioned bidirectional charger
Apply in example, can also reach identical technique effect.
The above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, on the premise of principle of the present invention is not departed from, some improvements and modifications can also be made, these improvements and modifications
Should be regarded as protection scope of the present invention.
Claims (11)
1. a kind of overcurrent protection circuit, is connected in the drive circuit of the bidirectional charger of electric automobile, it is characterised in that
The overcurrent protection circuit includes：
Compare limit value and unit, including at least four voltage output ends are provided；Wherein first voltage output end and second voltage are exported
Upper voltage limit value and voltage lower limit value when end institute output voltage is respectively the bidirectional charger in charge mode, the 3rd electricity
On voltage when pressure output end and the 4th voltage output end institute output voltage are respectively the bidirectional charger in inverter mode
Limit value and voltage lower limit value；
Switch selecting unit, including two output ends and for be input into pattern residing for bidirectional charger sign signal it is first defeated
Enter end, when the first input end is input into the sign signal for charge mode, the switch selecting unit is used to make two
Output end is turned on the first voltage output end and second voltage output end respectively；It is inverse when the first input end is input into
During sign signal during change pattern, the switch selecting unit be used to making two output ends respectively with the tertiary voltage output end
Turned on the 4th voltage output end；
Comparing unit, including be input into for the voltage output end with the alternating current sample circuit of bidirectional charger is connected second
End, the 3rd input and the 4th input being connected with two output ends of the switch selecting unit respectively, it is described relatively more single
Unit, will for the voltage on second input to be compared with the voltage on the 3rd input and the 4th input
Comparative result is exported to the drive signal output unit of bidirectional charger by output end.
2. overcurrent protection circuit according to claim 1, it is characterised in that it is described compare limit value unit be provided include
First voltage input and second voltage input, wherein the magnitude of voltage of first voltage input input is more than described second
The magnitude of voltage of voltage input end input, and connected between the first voltage input and the second voltage input and be equipped with
Multiple divider resistances, the node connection between voltage output end divider resistance adjacent with two of which.
3. overcurrent protection circuit according to claim 2, it is characterised in that the limit value that compares provides the every of unit
Electric capacity is equipped with respectively between voltage output end described in one and the second voltage input.
4. overcurrent protection circuit according to claim 1, it is characterised in that the switch selecting unit includes a point
Pressure element, one end of the sectional pressure element is connected with the first input end, other end grounding connection.
5. overcurrent protection circuit according to claim 1, it is characterised in that second input and comparing unit
Output end be equipped with low-pass filter circuit respectively.
6. overcurrent protection circuit according to claim 1, it is characterised in that the switch selecting unit includes comparing
Sub-circuit and at least four switch sub-circuits, the sub-circuit that compares includes an input and an output end, wherein the comparing
The input of sub-circuit is formed as the first input end of the switch selecting unit, and when first input end input is charging
During sign signal during pattern, the output end exports the first fiducial value；When first input end input is inverter mode
Sign signal when, the output end exports the second fiducial value；
The wherein control end of the control end of first switch sub-circuit and second switch sub-circuit and the output for comparing sub-circuit
The control end and the input for comparing sub-circuit of end connection, the control end of the 3rd switch sub-circuit and the 4th switch sub-circuit
Connection；The input of the first switch sub-circuit is connected with the first voltage output end, the second switch sub-circuit
Input is connected with the second voltage output end, the input and the tertiary voltage output end of the 3rd switch sub-circuit
Connection, the input of the 4th switch sub-circuit is connected with the 4th voltage output end；And the first switch sub-circuit
Output end and the output end of the 3rd switch sub-circuit be connected with the first output end of the switch selecting unit, described the
The output end of the output end of two switch sub-circuits and the 4th switch sub-circuit and the second output of the switch selecting unit
End connection；
When the first input end input for charge mode when sign signal when, the first switch sub-circuit and second is opened
It is in closure state between the input and output end of climax circuit, the 3rd switch sub-circuit and the 4th switchs the defeated of sub-circuit
To enter disconnected in off-state between end and output end；When the first input end input for inverter mode when sign signal
When, it is in off-state, the described 3rd between the first switch sub-circuit and the input and output end of second switch sub-circuit
It is in closure state between switch sub-circuit and the input and output end of the 4th switch sub-circuit.
7. overcurrent protection circuit according to claim 1, it is characterised in that the comparing unit compares including first
Device and the second comparator, wherein, an input of an input of the first comparator and second comparator respectively with
The second input connection of the comparing unit；Another input of the first comparator is connected with the 3rd input；
Another input of second comparator is connected with the 4th input；And the output end of the first comparator with it is described
The output end connection of the second comparator, is formed as the output end of the comparing unit.
8. overcurrent protection circuit according to claim 1, it is characterised in that the output end of the comparing unit passes through
Latch is connected with the drive signal output unit of the bidirectional charger.
9. overcurrent protection circuit according to claim 8, it is characterised in that the latch includes comparing with described
5th input of the output end connection of unit, sign signal for being input into working condition residing for bidirectional charger it is the 6th defeated
Enter end, and the output end being connected with the drive signal output unit；When the bidirectional charger breaks down, the lock
Storage is used to latch fault-signal, makes the drive signal output unit output invalid signals.
10. a kind of bidirectional charger, it is characterised in that protect electricity including the overcurrent as described in claim any one of 1-9
Road.
11. a kind of electric automobiles, it is characterised in that including bidirectional charger as claimed in claim 10.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710102290.4A CN106712234B (en) | 2017-02-24 | 2017-02-24 | Current overcurrent protection circuit, bidirectional charger and electric automobile |
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| CN201710102290.4A CN106712234B (en) | 2017-02-24 | 2017-02-24 | Current overcurrent protection circuit, bidirectional charger and electric automobile |
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| CN106712234A true CN106712234A (en) | 2017-05-24 |
| CN106712234B CN106712234B (en) | 2019-02-01 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106985671A (en) * | 2017-05-31 | 2017-07-28 | 北京新能源汽车股份有限公司 | Vehicle-mounted bidirectional charger, vehicle-mounted bidirectional power supply method and device |
| CN107031406A (en) * | 2017-05-31 | 2017-08-11 | 北京新能源汽车股份有限公司 | Vehicle-mounted bidirectional charger, vehicle-mounted bidirectional power supply method and device |
| CN107134840A (en) * | 2017-06-16 | 2017-09-05 | 北京新能源汽车股份有限公司 | Current overcurrent protection circuit, bidirectional charger and electric automobile |
| CN107276153A (en) * | 2017-06-16 | 2017-10-20 | 北京新能源汽车股份有限公司 | Drive control circuit, bidirectional charger and electric automobile |
| CN107351687A (en) * | 2017-06-28 | 2017-11-17 | 北京新能源汽车股份有限公司 | Two-way vehicle-mounted charger and electric automobile |
| CN108973758A (en) * | 2018-08-31 | 2018-12-11 | 金华安靠电源科技有限公司 | A kind of charging recognition methods of charging system for electric automobile and electric car charging circuit |
| CN110971216A (en) * | 2018-12-06 | 2020-04-07 | 宁德时代新能源科技股份有限公司 | Overcurrent protection circuit |
| CN113459887A (en) * | 2021-06-26 | 2021-10-01 | 深圳欣锐科技股份有限公司 | Bidirectional charging system and related device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106985671A (en) * | 2017-05-31 | 2017-07-28 | 北京新能源汽车股份有限公司 | Vehicle-mounted bidirectional charger, vehicle-mounted bidirectional power supply method and device |
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| CN107276153A (en) * | 2017-06-16 | 2017-10-20 | 北京新能源汽车股份有限公司 | Drive control circuit, bidirectional charger and electric automobile |
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| CN110971216A (en) * | 2018-12-06 | 2020-04-07 | 宁德时代新能源科技股份有限公司 | Overcurrent protection circuit |
| CN110971216B (en) * | 2018-12-06 | 2021-08-17 | 宁德时代新能源科技股份有限公司 | Overcurrent protection circuit |
| CN113459887A (en) * | 2021-06-26 | 2021-10-01 | 深圳欣锐科技股份有限公司 | Bidirectional charging system and related device |
| CN113459887B (en) * | 2021-06-26 | 2023-02-10 | 深圳欣锐科技股份有限公司 | Bidirectional charging system and related device |
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