CN107134840A - A kind of overcurrent protection circuit, bidirectional charger and electric automobile - Google Patents
A kind of overcurrent protection circuit, bidirectional charger and electric automobile Download PDFInfo
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- CN107134840A CN107134840A CN201710470894.4A CN201710470894A CN107134840A CN 107134840 A CN107134840 A CN 107134840A CN 201710470894 A CN201710470894 A CN 201710470894A CN 107134840 A CN107134840 A CN 107134840A
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- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 85
- 230000000052 comparative effect Effects 0.000 claims abstract description 10
- 239000004065 semiconductor Substances 0.000 claims description 47
- 230000005611 electricity Effects 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
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Classifications
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- H02J7/027—
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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
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
-
- 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
Abstract
The present invention provides a kind of overcurrent protection circuit, bidirectional charger and electric automobile, is related to motor control technology field, the overcurrent protection circuit includes：The comparison limit value for providing upper voltage limit value and voltage lower limit value provides circuit, and, the signal of collection is compared with upper voltage limit value and voltage lower limit value, the comparison circuit of the control signal whether worked according to comparative result output control bidirectional charger.The solution of the present invention is realized during the bidirectional charger carries out energy conversion, and the signal of the DC side of the bidirectional charger of collection is detected in real time, it is to avoid electric current is excessive to cause the bidirectional charger or AC load to be damaged.
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, to drive AC load
Or the function of the power battery charging for other electric automobiles.
Bidirectional charger topological structure is as shown in figure 1, either charge function or inversion function, it is necessary to by certain
Control algolithm control eight metal-oxide-semiconductors of Q5-Q12 in two-way isolation DC/DC converters to realize the conversion of energy, Q5-Q12 eight
Energy conversion is terminated when metal-oxide-semiconductor is all off.
There are the following problems in the prior art：In the charge function of the bidirectional charger, the electricity of electrokinetic cell is flowed into
Flow through big；In the inversion function of the bidirectional charger, the electric current for flowing out the electrokinetic cell is excessive, causes described two-way fill
Motor or AC load are damaged；When there is over current fault, and before over current fault is not released from, it may appear that the Q5-Q12 eight
Metal-oxide-semiconductor is frequently switched off and on, and causes the problem of eight metal-oxide-semiconductors are burst.
The content of the invention
The purpose of the embodiment of the present invention is to provide a kind of overcurrent protection circuit, bidirectional charger and electric automobile,
So as to solving in the prior art in charge function or the inversion function of bidirectional charger, due to over current fault cause it is described two-way
The problem of damage of charger or load.
To achieve these goals, the embodiments of the invention provide a kind of overcurrent protection circuit, it is connected to electronic vapour
In the drive circuit of the bidirectional charger of car, the overcurrent protection circuit includes：
Compare limit value and circuit, including first voltage output end and second voltage output end are provided, wherein, first voltage output
The upper voltage limit value of DC side when the voltage of end output is in charge mode for the bidirectional charger, second voltage output end is defeated
The voltage gone out is the voltage lower limit value of DC side when the bidirectional charger is in inverter mode；
Comparison circuit, including：First be connected with the voltage output end of the DC current sample circuit of bidirectional charger is defeated
Enter to hold, the second input being connected with the first voltage output end, and, the 3rd be connected with the second voltage output end
Input；
The comparison circuit is used for the voltage and the first of the voltage of second input according to the first input end
Comparative result, and the first input end voltage and the 3rd input voltage the second comparative result, output one
The control signal for controlling the bidirectional charger whether to work, wherein, it is more than described second in the voltage of the first input end
The voltage of input, or, when the voltage of the first input end is less than the voltage of the 3rd input, output one controls institute
State the control signal that bidirectional charger is stopped.
Wherein, the limit value offer circuit that compares includes first voltage input and second voltage input, described first
The magnitude of voltage of voltage input end input is more than the magnitude of voltage that the second voltage input is inputted；
Wherein, the first divider resistance and the second divider resistance are connected between the first input end and the second input,
Node connection between the first voltage output end and first divider resistance and the second divider resistance；
3rd divider resistance and the 4th divider resistance are connected between the first input end and the second input, and described
Node connection between two voltage output ends and the 3rd divider resistance and the 4th divider resistance.
Wherein, it is connected with the first electric capacity between the first voltage output end and the second voltage input；Described
The second electric capacity is connected between two voltage output ends and the second voltage input.
Wherein, the output end of the first input end and comparison circuit is connected to low-pass filter circuit respectively.
Wherein, the comparison circuit includes first comparator and the second comparator, wherein, the negative of the first comparator
First input end of the normal phase input end of input and second comparator respectively with the comparison circuit is connected；Described first
The normal phase input end of comparator is connected with second input；The negative-phase input of second comparator and the described 3rd defeated
Enter end connection；And the output end of the first comparator is connected with the output end of second comparator, is formed as the comparison
The output end of circuit.
Wherein, the overcurrent protection circuit also includes latch cicuit and driving signal output circuit, wherein, the ratio
Control signal compared with circuit output is exported to the driving signal output circuit by the latch cicuit；
The driving signal output circuit includes：The 4th input being connected with the output end of the latch cicuit, it is and double
The multiple driving signal inputs connected to the controller of charger, and, what is be connected with the drive circuit of bidirectional charger is more
Individual drive signal output end.
Wherein, the latch cicuit includes：
The 4th input being connected with the output end of the comparison circuit；
It is connected with the controller of bidirectional charger, of the indication signal for inputting working condition residing for bidirectional charger
Five inputs；
And, the output end being connected with the driving signal output circuit；
Wherein, when over current fault occurs for bidirectional charger, the latch cicuit is used for export the comparison circuit
Control signal is latched, and the driving signal output circuit is exported invalid drive signal.
Wherein, the driving signal output circuit includes metal-oxide-semiconductor and the single-chip microcomputer being connected with the metal-oxide-semiconductor；
Wherein, the grid of the metal-oxide-semiconductor is the 4th input；
The single-chip microcomputer includes：The multiple input ports being connected with the multiple driving signal input, it is and the multiple
Multiple output ports of drive signal output end connection, and, the enable input being connected with the drain electrode of the metal-oxide-semiconductor；
When occurring over current fault, the control signal that the latch cicuit output control bidirectional charger is stopped makes
The metal-oxide-semiconductor shut-off, wherein, when the metal-oxide-semiconductor is turned off, the enable input of the single-chip microcomputer is deactivated, the driving letter
Number output circuit exports invalid drive signal.
The embodiment of the present invention also provides a kind of bidirectional charger, wherein, the bidirectional charger includes electricity as described above
Flow current foldback circuit.
The embodiment of the present invention also provides a kind of electric automobile, wherein, the automobile includes bidirectional charger as described above.
The above-mentioned technical proposal of the present invention at least has the advantages that：
The embodiment of the present invention will flow into the electric current and electric current of electrokinetic cell when the bidirectional charger is in charge function
The higher limit that current foldback circuit is provided compares；In inversion function, the electric current for flowing out electrokinetic cell is protected with overcurrent
The lower limit that circuit is provided compares；So as to judge whether the electric current for flowing in or out the electrokinetic cell over-current phenomenon avoidance occurs, when
When there is over current fault, then the bidirectional charger is controlled to stop energy conversion, so as to avoid the bidirectional charger or load
It is damaged；Meanwhile, the over current fault signal is latched in the latch of the overcurrent protection circuit, makes drive signal defeated
Go out circuit and export invalid signals all the time, eight metal-oxide-semiconductors of Q5-Q12 are off state, until the single-chip microcomputer of bidirectional charger confirms
After fault clearance, then the latch to the current fault signal is released, driving signal output circuit is exported useful signal, this
Sample, avoids frequently to switch off and on eight metal-oxide-semiconductors of Q5-Q12, the phenomenon for causing eight metal-oxide-semiconductors to burst.
Brief description of the drawings
Fig. 1 is the topological structure schematic diagram of bidirectional charger；
Fig. 2 is the bidirectional charger DC current sampled signal waveform that DC current sample circuit is exported in charge function
Schematic diagram；
Fig. 3 is the bidirectional charger DC current sampled signal waveform that DC current sample circuit is exported in inversion function
Schematic diagram；
Fig. 4 is the comparison limit value and the schematic diagram of the relation of DC current sampled signal waveform of the embodiment of the present invention；
Fig. 5 is a kind of schematic diagram of the current foldback circuit of the embodiment of the present invention；
Fig. 6 is the another schematic diagram of the overcurrent protection circuit of the embodiment of the present invention；
Fig. 7 is another schematic diagram of the overcurrent protection circuit of the embodiment of the present invention.
Description of reference numerals：
1- compares limit value and provides circuit, 2- comparison circuits, 3- latch cicuits, 4- driving signal output circuits, first point of R1-
Piezoresistance, the divider resistances of R2- second, the divider resistances of R3- the 3rd, the divider resistances of R4- the 4th, the electric capacity of C1- first, the electricity of C2- second
Hold, U21- first comparators, the comparators of U22- second, U4- latch, U5- single-chip microcomputers, Q20-MOS pipes.
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 1, it is necessary to flowing in and out electrokinetic cell in the bidirectional charger carries out energy conversion process
Electric current sampled, and the current signal of sampling is monitored, so as to avoid over current fault from causing the bidirectional charger
Or the damage of AC load.
As shown in Fig. 2 when the bidirectional charger is in charge function, the DC current sample circuit of bidirectional charger
The signal of output is the alternation direct current signal EXT-AI-Idc more than preset voltage value, wherein, the preset voltage value is not have
When electric current flows into electrokinetic cell, the signal of the DC current sample circuit output of the bidirectional charger.
As shown in figure 3, when the bidirectional charger is in inversion function, the DC current sample circuit of bidirectional charger
The signal of output is the alternation direct current signal EXT-AI-Idc less than preset voltage value, wherein, the preset voltage value is not have
When electric current flows out electrokinetic cell, the signal of the DC current sample circuit output of the bidirectional charger.
As shown in Figure 5-Figure 7, the overcurrent protection circuit includes：
Compare limit value and circuit 1 is provided, the limit value offer circuit 1 that compares includes：First voltage output end and second voltage
Output end, wherein, the electricity of DC side when the voltage of first voltage output end output is in charge mode for the bidirectional charger
Higher limit is pressed, when the voltage of second voltage output end output is in inverter mode for the bidirectional charger under the voltage of DC side
Limit value；
Comparison circuit 2, the comparison circuit 2 includes：With the voltage output of the DC current sample circuit of bidirectional charger
The first input end of end connection, the second input being connected with the first voltage output end, and, it is defeated with the second voltage
Go out the 3rd input of end connection；
Specifically, the comparison circuit 2 is used for the electricity of the voltage and second input according to the first input end
First comparative result of pressure, and, the voltage of the first input end is compared knot with the second of the voltage of the 3rd input
Really, the control signal that whether control of output one bidirectional charger works, wherein, it is more than in the voltage of the first input end
The voltage of second input, or, when the voltage of the first input end is less than the voltage of the 3rd input, output
The control signal that the one control bidirectional charger is stopped.
Further, as shown in fig. 7, the limit value offer circuit 1 that compares includes first voltage input VCC, and second
Voltage input end GND, the magnitude of voltage of the first voltage input input is more than the voltage that the second voltage input is inputted
Value.
Further, the limit value offer circuit 1 that compares also includes：First divider resistance R1, the second divider resistance R2,
Three divider resistance R3, the 4th divider resistance R4, the first electric capacity C1 and the second electric capacity C2.
Specifically, the first divider resistance R1 and the second divider resistance R2 are connected on the first input end and
Between two inputs, the node between the first voltage output end and the first divider resistance R1 and the second divider resistance R2
Connection；By according to the voltage difference between first voltage input and second voltage input, and, it is described that limit value offer is provided
The upper voltage limit value that circuit 1 is provided, calculates the resistance of the first divider resistance R1 and the second divider resistance R2, so that
The limit value offer circuit 1 that compares provides accurate upper voltage limit value.
Specifically, the 3rd divider resistance R3 and the 4th divider resistance R4 are connected on the first input end and
Between two inputs, the node between the second voltage output end and the 3rd divider resistance R3 and the 4th divider resistance R4
Connection, by according to the voltage difference between first voltage input and second voltage input, and, it is described that limit value offer is provided
The voltage lower limit value that circuit 1 is provided, calculates the resistance of the 3rd divider resistance R3 and the 4th divider resistance R4, so that
The limit value offer circuit 1 that compares provides accurate voltage lower limit value.
Specifically, being connected with the first electric capacity C1, institute between the first voltage output end and the second voltage input
Stating the first electric capacity C1 is used to be filtered processing to the voltage of the upper voltage limit value of first voltage output end output, so that
The voltage of the first voltage output end output is more stable；Between the second voltage output end and the second voltage input
Being connected with the second electric capacity C2, the second electric capacity C2 is used for the voltage of the upper voltage limit value exported to the second voltage output end
Processing is filtered, so that the voltage of second voltage output end output is more stable.
It is used to be the comparison circuit 2 it should be noted that the comparison limit value in the above embodiment of the present invention provides circuit 1
Upper voltage limit value and voltage lower limit value are provided, therefore, any one can provide fixed upper voltage limit value and fixed voltage
The circuit connecting mode of lower limit can substitute the connected mode of foregoing circuit.
Further, as shown in fig. 7, the comparison circuit 2 includes：First comparator U21 and the second comparator U22, its
In, the negative-phase input of the first comparator U21 is compared electric with described respectively with the normal phase input end of second comparator
The first input end connection on road 2, for inputting the voltage signal EXT-AI- that the DC current sample circuit of bidirectional charger is exported
Idc；The normal phase input end of the first comparator U21 is connected with second input, is carried for inputting the limit value that compares
Power the upper voltage limit value Vref-Idc-H that road 1 exports, and the first comparator U21 is used for the DC current sample circuit
The voltage signal of output is compared with the upper voltage limit value, and obtains the first comparative result；The negative of second comparator is defeated
Enter end to be connected with the 3rd input, the voltage lower limit value Vref- that circuit 1 is exported is provided for inputting the limit value that compares
Idc-L, the second comparator U22 are used for the voltage signal for exporting the DC current sampled point road and the lower voltage limit
Value compares, and obtains the second comparative result；The output end of the first comparator U21 and the output of the second comparator U22
End connection, is formed as the output end of the comparison circuit, the output end of the comparison circuit 2 according to first comparative result and
Second comparative result exports a control signal, controls the bidirectional charger to work in no.
Specifically, the first input end is connected to the first LPF electricity that the 7th resistance R7 and the 7th electric capacity C7 is constituted
Road, so as to play smooth effect to the voltage of the first input end, makes the voltage of the first input end input more steady
It is fixed；The output of the comparison circuit is terminated with the second low-pass filter circuit that the 8th resistance R8 and the 9th electric capacity C9 is constituted, so that
Smooth effect is played to the voltage of second input, the voltage of the second input input is more stablized.
Wherein, the 9th resistance R9, the described 9th are connected between the output end and first voltage input of the comparison circuit 2
The control signal that resistance R9 is used for the output end output to the comparison circuit 2 provides a current channel；The comparison circuit 2
The 8th electric capacity C8 for playing filter action is connected between first voltage input and second voltage input.
It should be noted that the comparison circuit 2 can be two separate comparators, or be integrated in same
Two circuits with comparing function on one chip.
Further, as shown in fig. 6, the overcurrent protection circuit also includes latch cicuit 3 and drive signal is exported
Circuit 4, wherein, the control signal that the comparison circuit 2 is exported is exported to the drive signal by the latch cicuit 3 and exported
Circuit 4.
Specifically, as shown in fig. 7, the latch cicuit 3 includes the 4th be connected with the output end of the comparison circuit 2
Input；It is connected with the controller of bidirectional charger, of the indication signal for inputting working condition residing for bidirectional charger
Five inputs；And, the output end being connected with the driving signal output circuit；Wherein, when occurring over current fault, the lock
The control signal that depositing circuit is used to export the comparison circuit is latched, and the driving signal output circuit is exported invalid driving
Signal.
Specifically, the latch cicuit 3, which includes latch a U4, the latch U4, includes eight pins, wherein, D pipes
Pin, PRE pins are connected with power pin VCC, are always to be connected to filter between high level, and the power pin VCC and earth terminal
Tenth electric capacity C10 of ripple effect；CLR pins are connected with the 4th input；CLK pins pass through the 5th input and institute
The tenth resistance R10, institute are connected between controller the connection (not shown), and CLK pins and earth terminal of stating bidirectional charger
Stating the tenth resistance R10 is used to prevent the CLK pins moment from inputting larger voltage, causes the latch U4 to damage；Q is exported
Pin is connected with the output end of the latch cicuit 5, and is connected between power pin VCC the 11st resistance R11, the described tenth
One resistance R11 is pull-up resistor, for providing current channel for the latch U4 control signals exported；The Q efferent ducts
Pin is hanging.
The truth table of the latch U4 is as shown in the table, wherein, H represents high level, and L represents low level, × represent to appoint
Meaning level, ↑ represent to be changed into the rising edge of high level, H from low level+Expression is not present.
It is described double when the alternation direct current signal is located between upper voltage limit value and voltage lower limit value as shown in Figure 4
Over current fault does not occur to charger, CLR pins are high level H, and as shown in the first row true value relationship in truth table, the Q is defeated
Go out pin for high level H；When occurring over current fault, second comparison circuit 3 exports the second control signal, makes the CLR
Pin is low level L, as shown in the second row true value relationship in truth table, and the Q output pins are low level L；It is described two-way to fill
The controller of motor confirms occur after over current fault, and output makes in the signal that the CLK pins are low level L, such as truth table the
Shown in six row true value relationships, the Q output pins latch the low level L signal currently exported, i.e., described latch U4 is all the time
Export low level L；After the controller of the bidirectional charger confirms that the over current fault is released, the controller output one makes
The CLK is the control signal of rising edge, as shown in fourth line true value relationship in truth table, and the Q output pins are high level
H。
As shown in the above, the latch cicuit 3 latches the fault-signal, before over current fault releasing, Q outputs
Pin exports low level L all the time, so that the driving signal output circuit 4 exports invalid drive signal, makes described two-way fill
Motor is stopped, it is to avoid when excessively stream occurs, control after described eight metal-oxide-semiconductor shut-offs of Q5-Q12, two-way isolation DC/DC converters
Interior no current is flowed through, the direct current signal of the preset value when alternation direct current signal is zero point, and the preset value is joined positioned at the upper limit
Examine between magnitude of voltage and lower limit reference magnitude of voltage, so as to control eight metal-oxide-semiconductor conductings of Q5-Q12, finally released in over current fault
Before, frequently occur switching off and on for described eight metal-oxide-semiconductors of Q5-Q12, the problem of causing bombing.
Specifically, the driving signal output circuit 4 includes：The 4th be connected with the output end of the latch cicuit 3 is defeated
Enter to hold, the multiple driving signal inputs being connected with the controller of bidirectional charger, and, the drive circuit with bidirectional charger
Multiple drive signal output ends of connection.
Further, the driving signal output circuit includes：Metal-oxide-semiconductor Q20 and the monolithic being connected with the metal-oxide-semiconductor Q20
Machine U5, wherein, the grid of the metal-oxide-semiconductor Q20 is formed as the 4th input, is connected with the output end of the latch cicuit 3,
So that the control signal that the latch cicuit 3 is exported controls the metal-oxide-semiconductor Q20 on or off.
Specifically, as shown in fig. 7, the drain electrode of the metal-oxide-semiconductor Q20 is in parallel with earth terminal to be connected to the 16th resistance R16 and
12 electric capacity C12, the 16th resistance R16 make for preventing that the voltage instantaneous for inputting the 20th metal-oxide-semiconductor Q20 is excessive
20th metal-oxide-semiconductor is damaged；The 12nd electric capacity C12 plays a part of filtering；The source electrode of the metal-oxide-semiconductor Q20 and ground connection
End connection；The 20th resistance R20 is connected between the drain electrode of the metal-oxide-semiconductor Q20 and earth terminal；The drain electrode of the metal-oxide-semiconductor Q20 and the
The 19th resistance R19 for playing pull-up effect is connected between one voltage input end, the 19th resistance R19 and described second is
Resistance R20 is used for signal one current path of formation for the drain electrode output.
Further, the single-chip microcomputer U5 includes：The multiple input ports being connected with the multiple driving signal input,
The multiple output ports being connected with the multiple drive signal output end, and, with making that the drain electrode of the metal-oxide-semiconductor Q20 is connected
Can input；
When over current fault occurs for bidirectional charger, what the output control bidirectional charger of latch cicuit 3 was stopped
Control signal, turns off the metal-oxide-semiconductor Q20, when the metal-oxide-semiconductor is turned off, and the enable input of the single-chip microcomputer U5 is deactivated,
The driving signal output circuit 4 exports invalid drive signal, the bidirectional charger is stopped.
Specifically, as shown in fig. 7, the single-chip microcomputer U5 is multiple defeated including what is be connected with the multiple driving signal input
Inbound port, the multiple input port includes：PWM-Q5 input ports, PWM-Q6 input ports, PWM-Q9 input ports and
A resistance is connected between PWM-Q10 input ports, and each input port and earth terminal, the resistance is followed successively by the 12nd electricity
R12, the 13rd resistance R13, the 14th resistance R14 and the 15th resistance R15 are hindered, the resistance is used to avoid the input port
Moment inputs larger voltage, and the single-chip microcomputer U5 is caused to damage.
The single-chip microcomputer U5 also includes：The multiple output ports being connected with the multiple drive signal output end are described more
Individual output port includes：EXT-PWM-Q5 output ports, EXT-PWM-Q6 output ports, EXT-PWM-Q9 output ports and EXT-
A resistance is connected between PWM-Q10 output ports, and each output port and earth terminal, the resistance is followed successively by the 17th electricity
R17, the 18th resistance R18, the 21st resistance R21 and the 22nd resistance R22 are hindered, the resistance is used to avoid the input
Port moment inputs larger voltage, and the single-chip microcomputer U5 is caused to damage.Specifically, the driving of the EXT-PWM-Q5 outputs
Signal controls the shut-off and conducting of the metal-oxide-semiconductor Q5 and metal-oxide-semiconductor Q8；The drive signal control of the EXT-PWM-Q6 outputs is described
Metal-oxide-semiconductor Q6 and metal-oxide-semiconductor Q7 shut-off and conducting；The drive signal of the EXT-PWM-Q9 outputs controls the metal-oxide-semiconductor Q9 and MOS
Pipe Q12 shut-off and conducting；The drive signal of the EXT-PWM-Q10 outputs controls the pass of the metal-oxide-semiconductor Q10 and metal-oxide-semiconductor Q11
Disconnected and conducting.
The single-chip microcomputer U5 also includes the enable input being connected with the drain electrode of the metal-oxide-semiconductor Q20；The enable input
For controlling the single-chip microcomputer U5 whether to work, when the enable input inputs a useful signal, wherein, effective letter
Number can be a low level, enable input activation, the single-chip microcomputer U5 work is believed the driving that the controller is exported
After number being handled, export into drive circuit, all turn on eight metal-oxide-semiconductors of Q5-Q12, the bidirectional charger carries out energy
Amount is exchanged；When the enable input inputs an invalid signals, wherein, the invalid signals can be a high level, described
Enable input to deactivate, the single-chip microcomputer U5 is stopped, and the single-chip microcomputer U5 is not inputted to the list controller
Piece machine U5 drive signal is handled and exported, and described eight metal-oxide-semiconductors of Q5-Q12 are all off, and the bidirectional charger stops
Energy exchange.
The single-chip microcomputer U5 also includes the first input end VCC and the second input GND that voltage is provided for the single-chip microcomputer,
Wherein, it is connected to the 11st electric capacity C11 for playing filter action between the first input end VCC and the second input GND.
The signal that the above embodiment of the present invention realizes the DC current sample circuit collection to bidirectional charger is carried out
Compare, and whether the bidirectional charger is worked according to comparative result be controlled, so as to avoid the bidirectional charger from existing
When carrying out energy conversion, there is over current fault, cause the bidirectional charger and the AC load to be damaged.
Latch cicuit 3 in the above embodiment of the present invention realizes the over current fault for judging the comparison circuit 2 determination
Signal is latched, it is to avoid is frequently switched off and on described eight metal-oxide-semiconductors of Q5-Q12, is caused any one in eight metal-oxide-semiconductors
The problem of there is bombing.
The embodiment of the present invention also provides a kind of bidirectional charger, wherein, the bidirectional charger includes electricity as described above
Flow current foldback circuit.
It is corresponding due to the overcurrent protection circuit of the embodiment of the present invention, applied on bidirectional charger, therefore, this hair
Bright embodiment additionally provides a kind of bidirectional charger, wherein, the described of above-mentioned overcurrent protection circuit realizes that embodiment is equal
Suitable for the embodiment of the bidirectional charger, identical technique effect can be also reached.
The embodiment of the present invention also provides a kind of electric automobile, wherein, the automobile includes bidirectional charger as described above.
It is corresponding due to the bidirectional charger of the embodiment of the present invention, applied on double electric automobiles, therefore, reality of the invention
Apply example and additionally provide a kind of electric automobile, wherein, the described of above-mentioned bidirectional charger realizes that embodiment is applied to the electronic vapour
In the embodiment of car, identical technique effect can be also reached.
Described 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
It should be regarded as protection scope of the present invention.
Claims (10)
1. in a kind of overcurrent protection circuit, the drive circuit for being connected to the bidirectional charger of electric automobile, it is characterised in that
The overcurrent protection circuit includes：
Compare limit value and circuit, including first voltage output end and second voltage output end are provided, wherein, first voltage output end is defeated
The voltage gone out is the upper voltage limit value of DC side when the bidirectional charger is in charge mode, the output of second voltage output end
Voltage is the voltage lower limit value of DC side when the bidirectional charger is in inverter mode；
Comparison circuit, including：The first input end being connected with the voltage output end of the DC current sample circuit of bidirectional charger,
The second input being connected with the first voltage output end, and, the 3rd input being connected with the second voltage output end
End；
The comparison circuit is used to the first of the voltage of second input be compared according to the voltage of the first input end
As a result, and the first input end voltage and the 3rd input voltage the second comparative result, output one controls
The control signal whether bidirectional charger works, wherein, it is more than the described second input in the voltage of the first input end
The voltage at end, or, when the voltage of the first input end is less than the voltage of the 3rd input, the control of output one is described double
The control signal being stopped to charger.
2. overcurrent protection circuit according to claim 1, it is characterised in that the limit value offer circuit that compares includes
First voltage input and second voltage input, the magnitude of voltage of the first voltage input input are more than the second voltage
The magnitude of voltage of input input, wherein,
First divider resistance and the second divider resistance are connected between the first input end and the second input, first electricity
The node between output end and first divider resistance and the second divider resistance is pressed to connect；
3rd divider resistance and the 4th divider resistance are connected between the first input end and the second input, second electricity
The node between output end and the 3rd divider resistance and the 4th divider resistance is pressed to connect.
3. overcurrent protection circuit according to claim 2, it is characterised in that the first voltage output end with it is described
The first electric capacity is connected between second voltage input；Connect between the second voltage output end and the second voltage input
It is connected to the second electric capacity.
4. overcurrent protection circuit according to claim 1, it is characterised in that the first input end and comparison circuit
Output end be connected to low-pass filter circuit respectively.
5. overcurrent protection circuit according to claim 1, it is characterised in that the comparison circuit compares including first
Device and the second comparator, wherein, the normal phase input end point of the negative-phase input of the first comparator and second comparator
First input end not with the comparison circuit is connected；The normal phase input end of the first comparator connects with second input
Connect；The negative-phase input of second comparator is connected with the 3rd input；And the output end of the first comparator with
The output end connection of second comparator, is formed as the output end of the comparison circuit.
6. overcurrent protection circuit according to claim 1, it is characterised in that the overcurrent protection circuit is also wrapped
Latch cicuit and driving signal output circuit are included, wherein, the control signal of the comparison circuit output passes through the latch cicuit
Export to the driving signal output circuit；
The driving signal output circuit includes：The 4th input being connected with the output end of the latch cicuit, fills with two-way
Multiple driving signal inputs of the controller connection of motor, and, the multiple drives being connected with the drive circuit of bidirectional charger
Dynamic signal output part.
7. overcurrent protection circuit according to claim 6, it is characterised in that the latch cicuit includes：
The 4th input being connected with the output end of the comparison circuit；
It is connected with the controller of bidirectional charger, it is defeated for inputting the 5th of indication signal the of working condition residing for bidirectional charger the
Enter end；And,
The output end being connected with the driving signal output circuit；
Wherein, when over current fault occurs for bidirectional charger, the latch cicuit is used for the control for exporting the comparison circuit
Signal latch, makes the driving signal output circuit export invalid drive signal.
8. overcurrent protection circuit according to claim 6, it is characterised in that the driving signal output circuit includes
Metal-oxide-semiconductor and the single-chip microcomputer being connected with the metal-oxide-semiconductor, wherein,
The grid of the metal-oxide-semiconductor is the 4th input；
The single-chip microcomputer includes：The multiple input ports being connected with the multiple driving signal input, with the multiple driving
Multiple output ports of signal output part connection, and, the enable input being connected with the drain electrode of the metal-oxide-semiconductor；
When occurring over current fault, the control signal that the latch cicuit output control bidirectional charger is stopped makes described
Metal-oxide-semiconductor is turned off, wherein, when the metal-oxide-semiconductor is turned off, the enable input of the single-chip microcomputer is deactivated, and the drive signal is defeated
Go out the invalid drive signal of circuit output.
9. a kind of bidirectional charger, it is characterised in that protect electricity including the overcurrent as described in claim any one of 1-8
Road.
10. a kind of electric automobile, it is characterised in that including bidirectional charger as claimed in claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710470894.4A CN107134840A (en) | 2017-06-16 | 2017-06-16 | A kind of overcurrent protection circuit, bidirectional charger and electric automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710470894.4A CN107134840A (en) | 2017-06-16 | 2017-06-16 | A kind of overcurrent protection circuit, bidirectional charger and electric automobile |
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| Publication Number | Publication Date |
|---|---|
| CN107134840A true CN107134840A (en) | 2017-09-05 |
Family
ID=59736135
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710470894.4A Pending CN107134840A (en) | 2017-06-16 | 2017-06-16 | A kind of overcurrent protection circuit, bidirectional charger and electric automobile |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109541974A (en) * | 2018-11-26 | 2019-03-29 | 北京宇航系统工程研究所 | A kind of plug-in connector control circuit |
| CN112671244A (en) * | 2020-12-03 | 2021-04-16 | 珠海格力电器股份有限公司 | Overcurrent protection device and method for BMS active equalization system and automobile |
| 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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| CN201345530Y (en) * | 2008-12-29 | 2009-11-11 | 比亚迪股份有限公司 | Current foldback circuit |
| CN106712234A (en) * | 2017-02-24 | 2017-05-24 | 北京新能源汽车股份有限公司 | Overcurrent protection circuit, bidirectional charger and electric automobile |
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- 2017-06-16 CN CN201710470894.4A patent/CN107134840A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201345530Y (en) * | 2008-12-29 | 2009-11-11 | 比亚迪股份有限公司 | Current foldback circuit |
| CN106712234A (en) * | 2017-02-24 | 2017-05-24 | 北京新能源汽车股份有限公司 | Overcurrent protection circuit, bidirectional charger and electric automobile |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109541974A (en) * | 2018-11-26 | 2019-03-29 | 北京宇航系统工程研究所 | A kind of plug-in connector control circuit |
| CN112671244A (en) * | 2020-12-03 | 2021-04-16 | 珠海格力电器股份有限公司 | Overcurrent protection device and method for BMS active equalization system and automobile |
| CN112671244B (en) * | 2020-12-03 | 2024-03-26 | 珠海格力电器股份有限公司 | Overcurrent protection device and method of BMS active equalization system and automobile |
| 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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