CN106712234B - 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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- CN106712234B CN106712234B CN201710102290.4A CN201710102290A CN106712234B CN 106712234 B CN106712234 B CN 106712234B CN 201710102290 A CN201710102290 A CN 201710102290A CN 106712234 B CN106712234 B CN 106712234B
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- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 61
- 238000012512 characterization method Methods 0.000 claims description 22
- 230000005611 electricity Effects 0.000 claims description 8
- 239000003990 capacitor Substances 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 abstract description 5
- 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
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process 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
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012545 processing Methods 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
- 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
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- 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 car, more particularly, to a kind of overcurrent protection circuit,
Bidirectional charger and electric car.
Background technique
Vehicle-mounted bidirectional charger for electric automobile is that one kind can convert energy between power grid and electric automobile power battery
Device, have from power grid 220V/50Hz AC power source and obtain energy, charge for high voltage power battery in electric car
Function, and convert 220V/50Hz alternating current for the energy of high voltage power battery in electric car, with drive AC load or
The function of charging between the power battery of other electric cars.
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, there are the following problems for the algorithm of tetra- metal-oxide-semiconductors realization energy conversions of control Q1-Q4, and restriction is compared
Limit value circuit only provides single comparison limit value, therefore comparison circuit can only be to alternating current sampled signal as shown in Figure 2
The overcurrent protection for carrying out positive half period, does not have protective capability for the overcurrent of negative half-cycle, as shown in Figure 3；Single comparison limit
Whether alternating current when value is unable to monitor bidirectional charger charge power and inverter power different situation 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 acquired is adopted
Sample signal is less than and compares limit value, therefore tetra- metal-oxide-semiconductors of Q1-Q4 are connected immediately, since over current fault is not removed, will lead to
Tetra- metal-oxide-semiconductors of Q1-Q4 are frequently turned off, are connected, as shown in figure 4, there are the risks of bombing to make tetra- metal-oxide-semiconductors of Q1-Q4.
Summary of the invention
The purpose of the present invention is to provide a kind of AC overcurrent protection circuit, bidirectional charger and automobiles, to solve existing
There is overcurrent protection circuit in technology can not be under charge power and the different situation of inverter power, difference monitors alternating current
The limit value of stream.
To achieve the goals above, the present invention provides a kind of AC overcurrents to protect circuit, is connected to the double of electric car
Into the driving circuit of charger, comprising:
Compare limit value and unit, including at least four voltage output ends are provided；Wherein first voltage output end and second voltage
Output end institute output voltage is respectively the upper voltage limit and voltage lower limit value when the bidirectional charger is in charge mode, and
Three voltage output ends and the 4th voltage output end institute output voltage are respectively the electricity when bidirectional charger is in inverter mode
Press upper limit value and voltage lower limit value；
Switch selecting unit, the of the characterization signal including two output ends and for inputting mode locating for bidirectional charger
One input terminal, when the first input end inputs the characterization signal for charge mode, the switch selecting unit is for making
Two output ends are connected with the first voltage output end and second voltage output end respectively；When the first input end is inputted
When characterization signal when for inverter mode, the switch selecting unit is for keeping two output ends defeated with the tertiary voltage respectively
Outlet and the conducting of the 4th voltage output end；
Comparing unit, including second for being connect with the voltage output end of the alternating current sample circuit of bidirectional charger
Input terminal, the third input terminal and the 4th input terminal being connect respectively with two output ends of the switch selecting unit, the ratio
It is used to compare the voltage on second input terminal with the voltage on the third input terminal and the 4th input terminal compared with unit
Compared with being exported comparison result by output end to the driving signal output unit of bidirectional charger.
Wherein, it includes first voltage input terminal and second voltage input terminal that the relatively limit value, which provides unit, wherein described
The voltage value of first voltage input terminal input is greater than the voltage value of second voltage input terminal input, and the first voltage is defeated
Enter series connection between end and the second voltage input terminal and is equipped with multiple divider resistances, the voltage output end and two of them phase
Node connection between adjacent divider resistance.
Wherein, the relatively limit value is provided between each voltage output end and the second voltage input terminal of unit
It is equipped with capacitor respectively.
Wherein, the switch selecting unit includes a sectional pressure element, one end of the sectional pressure element and first input
End connection, other end grounding connection.
Wherein, the output end of second input terminal 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 comparison
Road includes an input terminal and an output end, wherein the input terminal of the relatively sub-circuit is formed as the of the switch selecting unit
One input terminal, when characterization signal when first input end input is charge mode, the first ratio of output end output
Compared with value；When first input end input is the characterization signal of inverter mode, the output end exports the second fiducial value；
The wherein control terminal of first switch sub-circuit and the control terminal of second switch the sub-circuit sub-circuit compared with described
Output end connection, third switch sub-circuit control terminal and the 4th switch sub-circuit control terminal compared with described sub-circuit it is defeated
Enter end connection；The input terminal of the first switch sub-circuit is connect with the first voltage output end, the second switch electricity
The input terminal on road is connect with the second voltage output end, and the input terminal and the tertiary voltage of the third switch sub-circuit are defeated
The input terminal of outlet connection, the 4th switch sub-circuit is connect with the 4th voltage output end；And first switch
The output end of the output end of circuit and third switch sub-circuit is connect with the first output end of the switch selecting unit, institute
State the second of the output end of second switch sub-circuit and the output end of the 4th switch sub-circuit and the switch selecting unit
Output end connection；
When characterization signal when first input end input is charge mode, the first switch sub-circuit and the
It is in closed state between the input terminal and output end of two switch sub-circuits, the third switch sub-circuit and the 4th switch sub-circuit
Input terminal and output end between in off-state disconnect；Characterization letter when first input end input is inverter mode
Number when, be in off-state between the first switch sub-circuit and the input terminal and output end of second switch sub-circuit, described the
It is in closed state between three switch sub-circuits and the input terminal 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 connect with the second input terminal of the comparing unit respectively with an input terminal of second comparator；Described first compares
Another input terminal of device is connect with the third input terminal；Another input terminal of second comparator and the 4th input terminal
Connection；And the output end of the first comparator is connect 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 driving signal output unit of latch and the bidirectional charger
Connection.
Wherein, the latch include the 5th input terminal being connect with the output end of the comparing unit, it is double for inputting
To the 6th input terminal of the characterization signal of working condition locating for charger, and it connect with the driving signal output unit defeated
Outlet；When the bidirectional charger breaks down, the latch keeps the driving signal defeated for latching fault-signal
Unit exports invalid signals out.
The present invention also provides a kind of bidirectional chargers, including overcurrent as described above to protect circuit.
The present invention also provides a kind of electric cars, including bidirectional charger as described above.
Above-mentioned technical proposal of the invention at least has the following beneficial effects:
The present invention, which compares limit value in the prior art, to be provided unit and improves, and is passed through and is calculated the suitable partial pressure electricity of selection
Resistance value, thus when the voltage upper limit value and lower limit value and inverter mode when bidirectional charger is in charge mode are provided for comparing unit
Voltage upper limit value and lower limit value is realized while monitoring the positive half period of alternating current and the AC overcurrent phenomenon of negative half-cycle；By limiting
Value, which compares to provide, increases switch selecting unit between unit and comparing unit, according to the difference of the operating mode of bidirectional charger,
Realize the alternating current over-current phenomenon avoidance of monitoring charge mode, or the alternating current over-current phenomenon avoidance of monitoring inverter mode；By than
It compared with latch is increased between unit and driving signal output unit, realizes when there is over-current phenomenon avoidance, the latch is by failure
Signal latch makes driving signal output unit export invalid driving signal and gives Q1-Q4 tetra- metal-oxide-semiconductors, until fault clearance, from
And tetra- metal-oxide-semiconductors of Q1-Q4 is avoided frequently to switch off and on.
Detailed description of the invention
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 schematic diagram of the alternating current sampled signal of the prior art compared with single limit value；
Fig. 4 is the schematic diagram that the 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 of comparison 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 symbols:
1- limit value compares offer unit, 2- switch selecting unit, 3- comparing unit, 5- driving signal output unit, R1-
One resistance, R2- second resistance, R3- 3rd resistor, the 4th resistance of R4-, the 5th resistance of R5-, the 6th resistance of R6-, U1- phase inverter,
U2- analog switch chip, U31- first comparator, the second comparator of U32-, U4- latch, U5- singlechip chip.
Specific embodiment
To keep the technical problem to be solved in the present invention, technical solution and advantage clearer, below in conjunction with attached 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, comprising: compare limit value and mention
For unit 1, switch selecting unit 2, comparing unit 3, latch U4 and driving signal output unit 5.
It includes first voltage input terminal and second voltage input terminal that the relatively limit value, which provides unit 1, wherein described first
The voltage value of voltage input end input is greater than the voltage value of second voltage input terminal input, and the first voltage input terminal
Series connection is equipped with multiple divider resistances by selecting after calculating between the second voltage input terminal, and the relatively limit value mentions
For unit to provide bidirectional charger be in charge mode alternating current overcurrent protection voltage upper limit value and lower limit value and in inverse
The voltage upper limit value and lower limit value of the alternating current overcurrent protection of change mode.
It further includes at least four voltage output ends that the relatively limit value, which provides unit 1, wherein first voltage output end and the
Node connection between one resistance R1 and second resistance R2, the voltage of output are voltage when bidirectional charger is in charge mode
Upper limit value；Node connection between second voltage output end and the 4th resistance R4 and the 5th resistance R5, the voltage of output are two-way
Charger is in voltage lower limit value when charge mode；Between tertiary voltage output end and second resistance R2 and 3rd resistor R3
Node connection, the voltage of output are upper voltage limit 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 are voltage when bidirectional charger is in inverter mode
Lower limit value.
Each voltage output end is equipped with filter capacitor between second voltage input terminal respectively, to make the electricity
Press the voltage value of output end output more stable.
The switch selecting unit 2 includes comparing sub-circuit and at least four switch sub-circuits.
Wherein, the relatively sub-circuit include a phase inverter U1, provide for the phase inverter voltage power supply and
The sectional pressure element being connected between the input terminal and ground terminal of the phase inverter U1.The input terminal of the phase inverter U1 is described opens
The first input end for closing selecting unit, for inputting the characterization signal of mode locating for bidirectional charger；The sectional pressure element is the
Six resistance R6, the abnormal voltage for inputting to the first input end carry out voltage division processing.
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, including four switch electricity inside the analog switch chip U2
Road, each switch sub-circuit includes a control terminal, an input terminal and an output end, by believing to the control terminal input control
Number, make the input terminal and output end closing or opening.
Wherein, the control terminal of first switch sub-circuit and the control terminal of second switch the sub-circuit sub-circuit compared with described
Output end connection, third switch sub-circuit control terminal and the 4th switch sub-circuit control terminal compared with described sub-circuit it is defeated
Enter end connection；The input terminal of the first switch sub-circuit is connect with the first voltage output end, the second switch electricity
The input terminal on road is connect with the second voltage output end, and the input terminal and the tertiary voltage of the third switch sub-circuit are defeated
The input terminal of outlet connection, the 4th switch sub-circuit is connect with the 4th voltage output end；And first switch
The output end of the output end of circuit and third switch sub-circuit is connect with the first output end of the switch selecting unit, institute
State the second of the output end of second switch sub-circuit and the output end of the 4th switch sub-circuit and the switch selecting unit
Output end connection.
When the first input end input be inverter mode when characterization signal when, it is described relatively sub-circuit output end
Export the first fiducial value, control terminal and fourth of the one control signal of first input end input to third switch sub-circuit
The control terminal for switching sub-circuit, make be between third switch sub-circuit and the input terminal and output end of the 4th switch sub-circuit
Closed state；The output end of the relatively sub-circuit exports the first fiducial value to the first switch sub-circuit and second switch
The control terminal of sub-circuit makes between the first switch sub-circuit and the input terminal and output end of second switch sub-circuit in disconnection
State disconnects；When the first input end input be charge mode when characterization signal when, the first input end will be with institute
It states the corresponding control signal of charge mode characterization signal and is sent to third switch sub-circuit and the 4th switch sub-circuit
Control terminal makes between the third switch sub-circuit and the input terminal and output end of the 4th switch sub-circuit in off-state；Institute
It states and compares 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 between the first switch sub-circuit and the input terminal and output end of second switch sub-circuit in closed state.
The comparing unit 3 includes first comparator U31 and the second comparator U32, wherein the first comparator
Mono- input terminal of U31 is connect with the second input terminal of the comparing unit respectively with an input terminal of the second comparator U32；Institute
Another input terminal for stating first comparator U31 is connect with the third input terminal；Another input terminal of the second comparator U32
It is connect with the 4th input terminal；And the output end of the output end of the first comparator U31 and the second comparator U32 connect
It connects, is formed as the output end of the comparing unit 3.
Wherein, second input terminal is used to connect with the voltage output end of the alternating current sample circuit of bidirectional charger
It connects；The third input terminal is connect with the first output end of the switch selecting unit 2；4th input terminal and the switch
The second output terminal of selecting unit 2 connects；The comparing unit 3 be used for by second input terminal voltage and the third
Voltage on input terminal and the 4th input terminal is compared, by comparison result by the output end of the comparing unit 3 export to
The driving signal output unit 5 of bidirectional charger.
Wherein, it is equipped with low-pass filter circuit respectively on the output end of second input terminal and the comparing unit, uses
In keeping the input voltage value and the output voltage values more stable.
As shown in figure 8, the output end of the comparing unit 3 passes through the driving signal of latch U4 and the bidirectional charger
Output unit 5 connects.
Wherein, the latch U4 includes the 5th input terminal connecting with the output end of the comparing unit 3, for inputting
6th input terminal of the characterization signal of working condition locating for bidirectional charger, and connect with the driving signal output unit 5
Output end；When the bidirectional charger breaks down, the latch U4 is driven for latching fault-signal by control
Dynamic signal output unit 5, makes driving signal output unit 5 export invalid signals, so that the bidirectional charger be made to stop energy
Conversion.
The driving signal output unit 5 includes a singlechip chip U5, is connected with the enable end of the singlechip chip U5
The metal-oxide-semiconductor Q20 connect.The output end of the latch U4 is connect with the grid of the metal-oxide-semiconductor Q20, passes through the latch U4's
The voltage value of output end output controls the disconnection or conducting of the metal-oxide-semiconductor Q20, to export invalid or effective driving signal.
Wherein, the input terminal of the singlechip chip U5 connects with the output end of the singlechip chip of bidirectional charger respectively
It connects；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 driving unit
It connects.
Overcurrent protection circuit of the invention is in specific application, described after the overcurrent protection circuit powers on
Limit value offer unit 1 is provided and exports the voltage upper limit value and lower limit value of stable charge mode and the voltage upper limit value and lower limit value of inverter mode,
As shown in fig. 6, when first input end input is the characterization signal of charge mode, the first switch sub-circuit and the
The input terminal of two switch sub-circuits and output end conducting, make the first voltage output end and the institute that export charge mode upper voltage limit
The third input terminal conducting for stating comparing unit, makes the second voltage output end for exporting charge mode voltage lower limit value compared with described
4th input terminal of unit is connected；Second input terminal inputs the alternating current sampled signal EXT-AI-Iac, the ratio
Compared with unit 3 by the upper voltage limit 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 and lower limit value of the charge mode
Between, then over current fault do not occur for the bidirectional charger, and the output end of the comparing unit 3 exports a high level, i.e., and its
The 5th input terminal of the latch U4 of connection inputs a high level, so that it is high so that the output end of the latch U4 is exported one
Level is connected the metal-oxide-semiconductor Q20, to make the enable end low level of the singlechip chip U5, exports driving signal
Unit 5 exports effective driving signal, makes tetra- metal-oxide-semiconductor conductings of Q1-Q4.
If over current fault occurs for the bidirectional charger, the alternating current sampled signal EXT-AI-Iac is not described
Between the upper voltage limit and lower limit value of charge mode, then the comparing unit 3 output end export a low level, thus make with
Its 5th input terminal connected inputs a low level, and the output end of latch true value table as shown in Figure 7, the latch U4 is defeated
A low level out makes the enable end high level of the singlechip chip U5, finally makes to drive so that the metal-oxide-semiconductor Q20 be made to turn off
Dynamic signal output unit 5 exports invalid driving signal, makes tetra- metal-oxide-semiconductor shutdowns of Q1-Q4, to stop the bidirectional charger
Energy conversion.
Work as failure vanishes, when the 5th input terminal is high level, since the 6th input terminal is always low level, institute
The output end output of latch U4 is stated as the low level latched, the driving signal that the driving signal output unit 5 exports is still
In vain, so that tetra- metal-oxide-semiconductors of Q1-Q4 be avoided frequently to switch off and on；When the single-chip microcontroller confirmation AC overcurrent event of bidirectional charger
After barrier is removed, a rising edge is inputted to the 6th input terminal, shown in truth table as shown in Figure 7, releases and over current fault is believed
Number latch, so that driving signal output unit 5 is exported effective driving signal and give Q1-Q4 tetra- metal-oxide-semiconductors.
When bidirectional charger is in inverter mode, the third switch sub-circuit and the 4th switch sub-circuit are led
It is logical, it is compared the alternating current sampled signal EXT-AI-Iac with the voltage upper limit value and lower limit value of inverter mode, finally makes to drive
Dynamic signal output unit 5 exports effective or invalid driving signal and gives Q1-Q4 tetra- metal-oxide-semiconductors.
The above embodiment of the present invention, by selecting suitable divider resistance value, so that it is single to provide the relatively limit value
Member 1 is capable of providing 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 being made to be in charge mode, the first voltage output end and the second voltage output end point
It is not connect with the third input terminal of the comparing unit and the 4th input terminal；When the bidirectional charger is in inverter mode,
The tertiary voltage output end and the 4th voltage output end are defeated with the third input terminal of the comparing unit 3 and the 4th respectively
Enter end connection；To realize the current limliting over current fault that can monitor charge mode and the current limliting overcurrent for monitoring inverter mode
Failure.By setting two comparators for comparing unit 3, to realize while monitor alternating current positive half period and negative half
The over-current phenomenon avoidance in period shortens the time of alternating current overcurrent protection response.By in comparing unit 3 and driving signal output
Increase latch U4 between unit 5, avoids tetra- metal-oxide-semiconductors of Q1-Q4 and frequently turn off, be connected, avoid the generation of blasted pipe phenomenon.
The present invention also provides a kind of bidirectional chargers, including overcurrent as described above to protect circuit.
Accordingly since the overcurrent of the embodiment of the present invention protects circuit, it is applied on bidirectional charger, therefore, this hair
Bright embodiment additionally provides a kind of bidirectional charger, wherein realization embodiment described in above-mentioned overcurrent protection circuit is applicable in
In the embodiment of the bidirectional charger, it can also reach identical technical effect.
The present invention also provides a kind of electric cars, including bidirectional charger as described above.
Accordingly due to the bidirectional charger of the embodiment of the present invention, it is applied on electric car, therefore, the embodiment of the present invention
Additionally provide a kind of electric car, wherein realization embodiment described in above-mentioned bidirectional charger is suitable for the reality of the electric car
It applies in example, can also reach identical technical effect.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, several improvements and modifications can also be made, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (11)
1. a kind of overcurrent protects circuit, it is connected in the driving circuit of the bidirectional charger of electric car, which is characterized in that
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 output
End institute's output voltage is respectively the upper voltage limit and voltage lower limit value when the bidirectional charger be in charge mode, and third is electric
Pressure output end and the 4th voltage output end institute output voltage are respectively on the voltage when bidirectional charger is in inverter mode
Limit value and voltage lower limit value；
Switch selecting unit, first of the characterization signal including two output ends and for inputting mode locating for bidirectional charger are defeated
Enter end, when the first input end inputs the characterization signal for charge mode, the switch selecting unit is for making two
Output end is connected with the first voltage output end and second voltage output end respectively；It is inverse when the first input end inputs
When characterization signal when change mode, the switch selecting unit for make two output ends respectively with the tertiary voltage output end
It is connected with the 4th voltage output end；
Comparing unit, including the second input for being connect with the voltage output end of the alternating current sample circuit of bidirectional charger
End, the third input terminal and the 4th input terminal being connect respectively with two output ends of the switch selecting unit, it is described relatively more single
Member, will for the voltage on second input terminal to be compared with the voltage on the third input terminal and the 4th input terminal
Comparison result is exported by output end to the driving signal output unit of bidirectional charger.
2. overcurrent according to claim 1 protects circuit, which is characterized in that the relatively limit value provides unit and includes
First voltage input terminal and second voltage input terminal, wherein the voltage value of first voltage input terminal input is greater than described second
The voltage value of voltage input end input, and series connection is equipped between the first voltage input terminal and the second voltage input terminal
Multiple divider resistances, the node connection between voltage output end divider resistance adjacent with two of them.
3. overcurrent according to claim 2 protects circuit, which is characterized in that the relatively limit value provides the every of unit
It is equipped with capacitor respectively between one voltage output end and the second voltage input terminal.
4. overcurrent according to claim 1 protects circuit, which is characterized in that the switch selecting unit includes one point
Element is pressed, one end of the sectional pressure element is connect with the first input end, other end grounding connection.
5. overcurrent according to claim 1 protects circuit, which is characterized in that second input terminal and comparing unit
Output end be equipped with low-pass filter circuit respectively.
6. overcurrent according to claim 1 protects circuit, which is characterized in that the switch selecting unit includes comparing
Sub-circuit and at least four switch sub-circuits, the relatively sub-circuit includes an input terminal and an output end, wherein the comparison
The input terminal of sub-circuit is formed as the first input end of the switch selecting unit, when first input end input is charging
When characterization signal when mode, the output end of the relatively sub-circuit exports the first fiducial value；When the first input end inputs
When being the characterization signal of inverter mode, the output end of the relatively sub-circuit exports the second fiducial value；
The wherein output of the control terminal of first switch sub-circuit and the control terminal of second switch the sub-circuit sub-circuit compared with described
End connection, third switch the input terminal of the control terminal of sub-circuit and control terminal sub-circuit compared with described of the 4th switch sub-circuit
Connection；The input terminal of the first switch sub-circuit is connect with the first voltage output end, the second switch sub-circuit
Input terminal is connect with the second voltage output end, the input terminal and the tertiary voltage output end of the third switch sub-circuit
The input terminal of connection, the 4th switch sub-circuit is connect with the 4th voltage output end；And the first switch sub-circuit
Output end and the output end of third switch sub-circuit connect with the first output end of the switch selecting unit, described the
Second output of the output end and the switch selecting unit of the output end of two switch sub-circuits and the 4th switch sub-circuit
End connection；
When the first input end input be charge mode when characterization signal when, the first switch sub-circuit and second is opened
It is in closed state between the input terminal and output end of climax circuit, the third switch sub-circuit and the 4th switchs the defeated of sub-circuit
Enter and is disconnected between end and output end in off-state；Characterization signal when first input end input is inverter mode
When, it is in off-state, the third between the first switch sub-circuit and the input terminal and output end of second switch sub-circuit
Switching between sub-circuit and the input terminal and output end of the 4th switch sub-circuit is in closed state.
7. overcurrent according to claim 1 protects circuit, which is characterized in that the comparing unit compares including first
Device and the second comparator, wherein an input terminal of an input terminal of the first comparator and second comparator respectively with
Second input terminal of the comparing unit connects；Another input terminal of the first comparator is connect with the third input terminal；
Another input terminal of second comparator is connect with the 4th input terminal；And the output end of the first comparator with it is described
The output end of second comparator connects, and is formed as the output end of the comparing unit.
8. overcurrent according to claim 1 protects circuit, which is characterized in that the output end of the comparing unit passes through
Latch is connect with the driving signal output unit of the bidirectional charger.
9. overcurrent according to claim 8 protects circuit, which is characterized in that the latch includes compared with described
5th input terminal of the output end connection of unit, characterization signal for inputting working condition locating for bidirectional charger it is the 6th defeated
Enter end, and the output end connecting with the driving signal output unit；When the bidirectional charger breaks down, the lock
Storage makes the driving signal output unit output invalid signals for latching fault-signal.
10. a kind of bidirectional charger, which is characterized in that including the described in any item overcurrent protection electricity of such as claim 1-9
Road.
11. a kind of electric car, which is characterized in that including bidirectional charger as claimed in claim 10.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710102290.4A CN106712234B (en) | 2017-02-24 | 2017-02-24 | Current overcurrent protection circuit, bidirectional charger and electric automobile |
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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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| CN106712234A CN106712234A (en) | 2017-05-24 |
| CN106712234B true CN106712234B (en) | 2019-02-01 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106985671B (en) * | 2017-05-31 | 2019-07-26 | 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 |
| CN107031406B (en) * | 2017-05-31 | 2019-07-09 | 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 |
| CN107351687B (en) * | 2017-06-28 | 2019-10-18 | 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 |
| 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 |
| CN109391238B (en) * | 2018-12-14 | 2024-08-06 | 北京华峰测控技术股份有限公司 | Power and heat release protection circuit and heat protection method |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20020053360A (en) * | 2000-12-27 | 2002-07-05 | 이계안 | A system for preventing over-current of fuel cell vehicle and a method thereof |
| JP5333126B2 (en) * | 2009-09-29 | 2013-11-06 | 株式会社デンソー | Battery controller |
| CN201601606U (en) * | 2009-12-24 | 2010-10-06 | 上海樟村电子有限公司 | Power supply system of hybrid electric vehicle |
| DE102011079918A1 (en) * | 2011-07-27 | 2013-01-31 | Siemens Aktiengesellschaft | Transformer subcircuit |
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