CN206379716U - Electric automobile, onboard charger and its current foldback circuit - Google Patents
Electric automobile, onboard charger and its current foldback circuit Download PDFInfo
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- CN206379716U CN206379716U CN201621412119.0U CN201621412119U CN206379716U CN 206379716 U CN206379716 U CN 206379716U CN 201621412119 U CN201621412119 U CN 201621412119U CN 206379716 U CN206379716 U CN 206379716U
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Abstract
The utility model discloses a kind of electric automobile, onboard charger and its current foldback circuit; wherein; onboard charger includes AC/DC converters and DC/DC converters, and the SiC switching tubes that AC/DC converters and DC/DC converters are driven using optocoupler, current foldback circuit includes：Current detecting unit, by detecting the output end current of DC/DC converters with output electric current measure value；Over-current protecting unit, for output overcurrent protection signal；Control unit, the control signal output channel of SiC switching tubes is closed when receiving overcurrent protection signal, so that AC/DC converters and DC/DC converters are stopped.The current foldback circuit can quickly trigger overcurrent protection function when over current fault occurs in onboard charger, lift the security of onboard charger work, meanwhile, the charge rate of onboard charger, reduction control difficulty and cost can be improved using SiC switching tubes.
Description
Technical field
The utility model is related to electric vehicle engineering field, more particularly to a kind of current foldback circuit of onboard charger,
A kind of onboard charger and a kind of electric automobile.
Background technology
Because the vehicle exhaust that conventional fuel oil car is produced aggravates environmental pollution, earth petroleum resources are increasingly in short supply, therefore entirely
Ball market rapidly increases for the demand of electric automobile.
At present, Two Stages structure, concrete structure are used onboard charger as shown in figure 1, the onboard charger first will more
Alternating current passes through the rectification of AC/DC converters 100, the direct current after rectification then is electrically accessed into DC/DC converters 200, with to direct current
Voltage is adjusted, finally by the DC supply input after regulation to load (i.e. battery bag).
Physical circuit topology is as shown in Fig. 2 DC/DC converters more than 200 are using BOOST (boost chopper) and BUCK
(buck circuit) circuit realiration DC/DC is changed, and switching tube typically uses IGBT (Insulated Gate Bipolar
Transistor, igbt), IGBT break-make is controlled by driving chip, the model of the driving chip is general
For 1ED020I12FA.
To ensure the security of onboard charger work, setting current foldback circuit is generally required.Some onboard chargers
It can be passed through according to the IPM (Intelligent Power Module, SPM) collected overcurrent protection signal
Software or hardware circuit close PWM (Pulse Width Modulation, pulse width modulation) output channel, realize excessively stream
Protection.
But, most of onboard charger uses metal-oxide-semiconductor, without IPM (Intelligent Power Module,
SPM) overcurrent protection signal is, it is necessary to by detecting the current signal of onboard charger to build overcurrent protection signal.
However, some onboard charger highest switching frequencies are up to 100KHz, if using the onboard charger of realizing of the above method
Overcurrent protection function, the action time delay of its current foldback circuit is larger, and overcurrent protection function has failure risk, serious shadow
Ring the security of onboard charger work.
Utility model content
The utility model is intended at least solve one of technical problem in correlation technique to a certain extent.Therefore, this reality
It is to propose a kind of current foldback circuit of onboard charger with a new purpose, the current foldback circuit can be vehicle-mounted
The quick security for triggering overcurrent protection function, lifting onboard charger work when excessively stream occurs in charger, meanwhile, vehicle-mounted charge
Device uses SiC (Silicon Carbide, carborundum) switching tube, can improve the charge rate of onboard charger, reduction control
Difficulty and cost.
Second purpose of the present utility model is to propose a kind of onboard charger.
3rd purpose of the present utility model is to propose a kind of electric automobile.
To reach above-mentioned purpose, on the one hand the utility model proposes a kind of current foldback circuit of onboard charger, institute
Stating onboard charger includes AC/DC converters and DC/DC converters, and the AC/DC converters and DC/DC converters use light
The SiC switching tubes of coupling driving, the current foldback circuit includes：Current detecting unit, the current detecting unit passes through detection
The output end current of the DC/DC converters is with output electric current measure value；Over-current protecting unit, the over-current protecting unit and institute
State current detecting unit to be connected, the over-current protecting unit is used to export when the current detection value is more than predetermined current threshold
Overcurrent protection signal；Control unit, described control unit is connected with the over-current protecting unit, and described control unit is being received
The control signal output channel of the SiC switching tubes is closed during the overcurrent protection signal so that the AC/DC converters and
DC/DC converters are stopped.
According to the current foldback circuit of onboard charger of the present utility model, current detecting unit is by detecting that DC/DC becomes
The output end current of parallel operation is with output electric current measure value, and over-current protecting unit is defeated when current detection value is more than predetermined current threshold
Go out overcurrent protection signal, control unit closes the control signal output channel of SiC switching tubes when receiving overcurrent protection signal,
So that AC/DC converters and DC/DC converters are stopped.Thus, the current foldback circuit can occur in onboard charger
The quick security for triggering overcurrent protection function, lifting onboard charger work during over current fault, meanwhile, onboard charger is used
SiC switching tubes, can improve the charge rate of onboard charger, reduction control difficulty and cost.
In addition, can also have technology additional as follows according to the current foldback circuit of onboard charger of the present utility model
Feature：
Specifically, the current detecting unit includes current Hall sensor, and the current Hall sensor is connected to institute
State the output end of DC/DC converters.
Further, the DC/DC converters are resonant full bridge isolated converter, the resonant full bridge isolated converter bag
Include the first bridge-type converter unit, the second bridge-type converter unit and isolating transformer, the input of the first bridge-type converter unit
It is connected with the DC terminal of the AC/DC converters, the output end of the first bridge-type converter unit is connected to the isolation transformation
The primary side of device, the primary side of the isolating transformer connects the input of the second bridge-type converter unit, second bridge
The output end of formula converter unit is parallel with DC bus capacitor and as the output end of the DC/DC converters, the current Hall
Sensor is connected to the positive terminal of the DC bus capacitor.
Specifically, the AC/DC converters are three-phase bridge inverter, and the exchange end of the three-phase bridge inverter is used to
Power network or motor are connected, the DC terminal of the three-phase bridge inverter is parallel with bus capacitor.
Specifically, the SiC switching tubes are SiC power field effect pipes.
Specifically, the over-current protecting unit includes：It is connected on first resistor between reference voltage power supply and ground, second
Resistance and 3rd resistor, have first node between the second resistance and the 3rd resistor；Comparator, the comparator
Negative input end is connected with the output end of the current detecting unit, the positive input terminal of the comparator and the first node phase
Even；4th resistance, one end of the 4th resistance is connected with the first default power supply, the other end and the ratio of the 4th resistance
Output end compared with device is connected；5th resistance, one end of the 5th resistance is connected with the output end of the comparator；6th electricity
Resistance, one end of the 6th resistance is connected with the other end of the 5th resistance, the other end ground connection of the 6th resistance；First
Electric capacity, first electric capacity and the 6th resistor coupled in parallel.
Further, the over-current protecting unit also includes：Amplifier, the positive input terminal of the amplifier respectively with it is described
The other end of 5th resistance is connected with one end of the 6th resistance, and the negative input end of the amplifier is defeated with the amplifier
Go out end to be connected, the power end of the amplifier is connected with the described first default power supply；Second electric capacity, one end of second electric capacity
It is connected with the power end of the amplifier, the other end ground connection of second electric capacity；7th resistance, one end of the 7th resistance
It is connected with the output end of the amplifier, the other end of the 7th resistance is connected with described control unit；3rd electric capacity, it is described
One end of 3rd electric capacity is connected with the other end of the 7th resistance, the other end ground connection of the 3rd electric capacity.
Further, the over-current protecting unit also includes：First clamp diode, first clamp diode
Plus earth；Second clamp diode, the negative electrode phase of the anode of second clamp diode and first clamp diode
Even, there is Section Point, described the between the anode of second clamp diode and the negative electrode of first clamp diode
The negative electrode of two clamp diodes is connected with the described first default power supply, the other end phase of the Section Point and the 7th resistance
Even.
To reach above-mentioned purpose, second aspect of the present utility model proposes a kind of onboard charger, and it is new that it includes this practicality
The current foldback circuit of onboard charger described in type first aspect.
Onboard charger of the present utility model, passes through the current detecting list of the current foldback circuit of above-mentioned onboard charger
Member detects the output end current of DC/DC converters with output electric current measure value, and by over-current protecting unit in current detection value
Output overcurrent protection signal during more than predetermined current threshold, and closed by control unit when receiving overcurrent protection signal
The control signal output channel of SiC switching tubes, so that AC/DC converters and DC/DC converters are stopped.Thus, this is vehicle-mounted
Charger can quickly trigger overcurrent protection function when there is over current fault, lift the security of onboard charger work, together
When, onboard charger uses SiC switching tubes, can improve the charge rate of onboard charger, reduction control difficulty and cost.
To reach above-mentioned purpose, the third aspect of the present utility model proposes a kind of electric automobile, and it includes the utility model
Onboard charger described in second aspect.
Electric automobile of the present utility model, by above-mentioned onboard charger, excessively stream event can occurs in onboard charger
The quick security for triggering overcurrent protection function, lifting onboard charger work during barrier, meanwhile, onboard charger is opened using SiC
Guan Guan, can improve the charge rate of electric automobile, reduction control difficulty and cost.
Brief description of the drawings
The above-mentioned and/or additional aspect of the utility model and advantage from the following description of the accompanying drawings of embodiments will
Become substantially and be readily appreciated that, wherein,
Fig. 1 is the block diagram of onboard charger in correlation technique；
Fig. 2 is the circuit topology figure of onboard charger in correlation technique；
Fig. 3 is the block diagram of the current foldback circuit of the onboard charger according to the utility model one embodiment；
Fig. 4 is the circuit topology figure of the onboard charger according to the utility model one embodiment；
Fig. 5 is the circuit topology figure of the current foldback circuit of the onboard charger according to the utility model one embodiment.
Embodiment
Embodiment of the present utility model is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning
Same or similar element or element with same or like function are represented to same or similar label eventually.Below by ginseng
The embodiment for examining accompanying drawing description is exemplary, it is intended to for explaining the utility model, and it is not intended that to the utility model
Limitation.
With reference to the accompanying drawings come describe according to the utility model embodiment propose onboard charger current foldback circuit,
Onboard charger and electric automobile.
Fig. 3 is the block diagram of the current foldback circuit of the onboard charger according to the utility model one embodiment.
Wherein, as shown in figure 4, onboard charger includes：AC/DC converters 40 and DC/DC converters 50, AC/DC converters 10 and DC/
The SiC switching tubes that DC converters 20 are driven using optocoupler.
As shown in figure 3, current foldback circuit includes：Current detecting unit 10, over-current protecting unit 20 and control unit 30.
Current detecting unit 10 is by detecting the output end current of DC/DC converters 50 with output electric current measure value.Excessively stream
Protection location 20 is connected with current detecting unit 10, and over-current protecting unit 20 is used to be more than predetermined current threshold in current detection value
When output overcurrent protection signal.Control unit 30 is connected with over-current protecting unit 20, and control unit 30 is receiving overcurrent protection
The control signal output channel of SiC switching tubes is closed during signal, so that AC/DC converters 40 and DC/DC converters 50 stop work
Make.Predetermined current threshold can be preset according to actual conditions.
Wherein, in the utility model embodiment, SiC switching tubes are SiC power field effect pipes.With traditional FET
Compare, SiC power field effect pipes have the following advantages that：1st, pressure voltage is high, can reach 1200V；2nd, overcurrent capability is strong, can reach
72A；3rd, conduction impedance is low；4th, quick switching capability；5th, faster Reverse recovery ability；6th, it is used in parallel more to facilitate, and
Type of drive is simpler.Therefore, traditional FET is replaced with SiC power field effect pipes, onboard charger can be improved
Charge rate, reduction control difficulty and cost.
Specifically, current detecting unit 10 detects the output end current of onboard charger DC/DC converters 50 in real time, and defeated
Go out current detection value to over-current protecting unit 20, if current detection value is more than predetermined current threshold, illustrate onboard charger
There is over current fault, the output overcurrent protection signal of over-current protecting unit 20 to control unit 30.Control unit 30 can be DSP
(Digital Signal Process, Digital Signal Processing) chip, its model can be TMS320F28335, the model
Dsp chip supports external interrupt, and overcurrent protection signal is sent to dsp chip and supports drawing for external interrupt by over-current protecting unit 20
Pin, triggering is interrupted, and closes the control signal output channel of SiC switching tubes, i.e. PWM (Pulse Width Modulation, pulse
Width modulated) passage, AC/DC converters 40 and DC/DC converters 50 be stopped, and realizes the overcurrent protection of onboard charger.
It should be noted that in embodiment of the present utility model, optocoupler can use the paster integrated package of Avago
ACPL-K33T, it uses 18V to power, and complementary PWM signals are added in the ANODE pins and CATHODE pins of optocoupler respectively all the way,
Optocoupler output connects the gate pole of SiC power field effect pipes by gate electrode resistance.When ANODE pins are high level and CATHODE draws
When pin is low level, optocoupler output high level 18V, SiC power field effect pipe is open-minded；When ANODE pins be low level and
When CATHODE pins are high level, optocoupler output low level 0V, SiC power field effect pipe is turned off, AC/DC converters 40 and DC/
DC converters 50 are stopped.
According to one embodiment of the present utility model, current detecting unit 10 includes current Hall sensor 101, such as Fig. 4
Shown, current Hall sensor 10 is connected to the output end of DC/DC converters 50.Current Hall sensor 101 can use Chinese mugwort
Your bidirectional current Hall sensor ACS770 of common vetch.
Further, according to one embodiment of the present utility model, as shown in figure 4, DC/DC converters 50 are resonant full bridge
Isolated converter, resonant full bridge isolated converter include the first bridge-type converter unit 501, the second bridge-type converter unit 502 and every
From transformer T, the input of the first bridge-type converter unit 501 is connected with the DC terminal of AC/DC converters 40, the conversion of the first bridge-type
The output end of unit 501 is connected to isolating transformer T primary side, and isolating transformer T primary side connects the conversion of the second bridge-type
The input of unit 502, the output end of the second bridge-type converter unit 502 is parallel with DC bus capacitor C and converted as DC/DC
The output end of device 50, current Hall sensor 101 is connected to DC bus capacitor C positive terminal.
Specifically, as shown in figure 4, resonant full bridge isolated converter also includes the first inductance Lr1, primary lateral capacitance Cr1, the
Two inductance Lr2 and secondary lateral capacitance Cr2, the first inductance Lr1, primary lateral capacitance Cr1, the second inductance Lr2, secondary lateral capacitance Cr2
With transformer T constitute resonance DC converter, for realize between line load and AC power (power network/motor) every
From.By setting the parameter of Lr1, Cr1, Lr2, Cr2 in resonance DC converter, make DC/DC converters 50 that perception is presented, i.e., it is electric
Lagging voltage is flowed, so that before V1-V8 is opened, existing electric current passes through fly-wheel diode, and the voltage at V1-V8 two ends is approximately zero,
Realize that no-voltage is open-minded, reach the purpose for reducing turn-on consumption.First bridge-type converter unit 501 is by first to fourth SiC power
FET is V1-V4 and fly-wheel diode composition, and the second bridge-type converter unit 502 is by the 5th to the 8th SiC power field effects
Pipe is V5-V8 and fly-wheel diode composition.In addition, as shown in figure 4, onboard charger can also include EMI (Electro
Magnetic Interference, electromagnetic interference) module, EMI modules are connected to power network/motor and AC/DC converters 40
Between, the EMI requirements for meeting power supply.Specific connected mode is as shown in figure 4, here is omitted.
According to one embodiment of the present utility model, as shown in figure 4, AC/DC converters 40 are three-phase bridge inverter, three
The exchange end of phase bridge converter is parallel with bus electricity to connect power network or motor, the DC terminal of three-phase bridge inverter
Hold C0.AC/DC converters 40 by alternating current to be converted to direct current.
According to one embodiment of the present utility model, as shown in figure 5, over-current protecting unit 20 includes：First resistor R1,
Two resistance R2,3rd resistor R3, comparator A1, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 and the first electric capacity C1.
Wherein, first resistor R1, second resistance R2 and 3rd resistor R3 be connected on reference voltage power supply VCC1 with ground GND it
Between, there is first node Q1 between second resistance R2 and 3rd resistor R3.Comparator A1 negative input end and current detecting unit
10 output end is connected, and comparator A1 positive input terminal is connected with first node Q1.Preset with first 4th resistance R4 one end
Power supply VCC2 is connected, and the 4th resistance R4 other end is connected with comparator A1 output end.5th resistance R5 one end is with being compared
Device A1 output end is connected.6th resistance R6 one end is connected with the 5th resistance R5 other end, the 6th resistance R6 other end
Ground connection, the first electric capacity C1 is in parallel with the 6th resistance R6.
Specifically, reference voltage power supply VCC1 can be 3V, and R1 can be that 2K Ω, R2 can be 220 Ω, and R3 can be
20K Ω, reference signal is 2.7V.Comparator A1 model can be LM2901, and LM2901 is OC, it is impossible to export high level,
R4 is pull-up resistor, and comparator A1 can be made to export high level.Wherein, the first default power supply VCC2 can be 5V, and R4's can be with
For 10K Ω, R5 can be that 10K Ω, R6 can be that 15K Ω, C1 can be 1nF.R5, R6 constitute 0.6 ratio, make overcurrent protection
The requirement for meeting DSP of signal, R5 and C1 realize the function of filtering.
Further, according to one embodiment of the present utility model, as shown in figure 5, over-current protecting unit 20 can also be wrapped
Include：Amplifier A2, the second electric capacity C2, the 7th resistance R7, the 3rd electric capacity C3.
Wherein, the other end and the 6th resistance R6 one end phase of amplifier A2 positive input terminal respectively with the 5th resistance R5
Even, amplifier A2 negative input end is connected with amplifier A2 output end, amplifier A2 power end and the first default power supply
VCC2 is connected.Second electric capacity C2 one end is connected with the power end of amplifier, the second electric capacity C2 other end ground connection.7th resistance
R7 one end is connected with amplifier A2 output end, and the 7th resistance R7 other end is connected with control unit 30.3rd electric capacity C3
One end be connected with the 7th resistance R7 other end, the 3rd electric capacity C3 other end ground connection.
Specifically, amplifier A2 model can be LMV842, and amplifier A2 can be used as voltage follower.C2 is to steady
Determine 5V power supplys, its size can be 100nF.R7 and C3 are to filter, and R7 can be 51 Ω, and C3 can be 22nF.
Further, according to one embodiment of the present utility model, as shown in figure 5, over-current protecting unit 20 can be with
Including：First clamp diode D1 and the second clamp diode D2.
Wherein, the first clamp diode D1 plus earth.Second clamp diode D2 anode and the first two poles of clamp
Pipe D2 negative electrode is connected, and has Section Point between the second clamp diode D2 anode and the first clamp diode D1 negative electrode
Q2, the second clamp diode Q2 negative electrode is connected with the first default power supply VCC2, and Section Point Q2 is another with the 7th resistance R7's
End is connected.
Specifically, the first clamp diode D1 and the second clamp diode D2 is to by the Automatic level control of overcurrent protection signal
Within a preset range, the signal more than preset range will be dropped, to prevent overcurrent protection overflow from damaging control unit 30.
From Fig. 4 and Fig. 5, when current detection value is more than predetermined current threshold, over-current protecting unit 20 is by output overcurrent
Protection signal is to control unit 30.Control unit 30 receives overcurrent protection signal, and it is defeated to close the control signal of SiC switching tubes
Go out passage, so that AC/DC converters 40 and DC/DC converters 50 are stopped, so as to realize the overcurrent protection of onboard charger
Function.
The current foldback circuit of onboard charger of the present utility model gets up software and hardware combining, during software is configured in advance
It is disconnected, when hardware detection goes out over current fault, overcurrent protection can be triggered immediately, shortened the dynamic action time of protection circuit, carried
The security of onboard charger work is risen.
In summary, according to the current foldback circuit of onboard charger of the present utility model, current detecting unit passes through inspection
The output end current of DC/DC converters is surveyed with output electric current measure value, over-current protecting unit is more than default electricity in current detection value
Output overcurrent protection signal when flowing threshold value, control unit closes the control letter of SiC switching tubes when receiving overcurrent protection signal
Number output channel, so that AC/DC converters and DC/DC converters are stopped.Thus, the current foldback circuit can be vehicle-mounted
The quick security for triggering overcurrent protection function, lifting onboard charger work when over current fault occurs in charger, meanwhile, it is vehicle-mounted
Charger uses SiC switching tubes, can improve the charge rate of onboard charger, reduction control difficulty and cost.
The utility model also proposes a kind of onboard charger, and it includes the current foldback circuit of above-mentioned onboard charger.
Onboard charger of the present utility model, passes through the current detecting list of the current foldback circuit of above-mentioned onboard charger
Member detects the output end current of DC/DC converters with output electric current measure value, and by over-current protecting unit in current detection value
Output overcurrent protection signal during more than predetermined current threshold, and closed by control unit when receiving overcurrent protection signal
The control signal output channel of SiC switching tubes, so that AC/DC converters and DC/DC converters are stopped.Thus, this is vehicle-mounted
Charger can quickly trigger overcurrent protection function when there is over current fault, lift the security of onboard charger work, together
When, onboard charger uses SiC switching tubes, can improve the charge rate of onboard charger, reduction control difficulty and cost.
In addition, the utility model also proposes a kind of electric automobile, it includes above-mentioned onboard charger.
Electric automobile of the present utility model, by above-mentioned onboard charger, excessively stream event can occurs in onboard charger
The quick security for triggering overcurrent protection function, lifting onboard charger work during barrier, meanwhile, onboard charger is opened using SiC
Guan Guan, can improve the charge rate of electric automobile, reduction control difficulty and cost.
In description of the present utility model, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width
Degree ", " thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outer ", " suitable
The orientation or position relationship of the instruction such as hour hands ", " counterclockwise ", " axial direction ", " radial direction ", " circumference " are based on orientation shown in the drawings
Or position relationship, be for only for ease of description the utility model and simplify and describe, rather than indicate or imply signified device or
Element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to limit of the present utility model
System.
In addition, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or implying relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or
Implicitly include at least one this feature.In description of the present utility model, " multiple " are meant that at least two, such as two
It is individual, three etc., unless otherwise specifically defined.
In the utility model, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " Gu
It is fixed " etc. term should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integrally；Can be
Mechanically connect or electrically connect；Can be joined directly together, can also be indirectly connected to by intermediary, can be two
The connection of element internal or the interaction relationship of two elements, unless otherwise clear and definite restriction.For the common skill of this area
For art personnel, concrete meaning of the above-mentioned term in the utility model can be understood as the case may be.
In the utility model, unless otherwise clearly defined and limited, fisrt feature is "above" or "below" second feature
Can be that the first and second features are directly contacted, or the first and second features pass through intermediary mediate contact.Moreover, first is special
Levy second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only
Represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be with
Be fisrt feature immediately below second feature or obliquely downward, or be merely representative of fisrt feature level height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or the spy that the embodiment or example are described
Point is contained at least one embodiment of the present utility model or example.In this manual, to the schematic table of above-mentioned term
State and be necessarily directed to identical embodiment or example.Moreover, specific features, structure, material or the feature of description can be with
Combined in an appropriate manner in any one or more embodiments or example.In addition, in the case of not conflicting, this area
Technical staff the not be the same as Example or the feature of example and non-be the same as Example or example described in this specification can be entered
Row is combined and combined.
Although embodiment of the present utility model has been shown and described above, it is to be understood that above-described embodiment is
Exemplary, it is impossible to it is interpreted as to limitation of the present utility model, one of ordinary skill in the art is in scope of the present utility model
It is interior above-described embodiment to be changed, changed, replaced and modification.
Claims (10)
1. a kind of current foldback circuit of onboard charger, it is characterised in that the onboard charger include AC/DC converters and
DC/DC converters, the SiC switching tubes that the AC/DC converters and DC/DC converters are driven using optocoupler, the excessively stream is protected
Protection circuit includes：
Current detecting unit, the current detecting unit is by detecting the output end current of the DC/DC converters to export electricity
Flow detected value；
Over-current protecting unit, the over-current protecting unit is connected with the current detecting unit, and the over-current protecting unit is used for
The output overcurrent protection signal when the current detection value is more than predetermined current threshold；
Control unit, described control unit is connected with the over-current protecting unit, and described control unit is receiving the excessively stream
The control signal output channel of the SiC switching tubes is closed during protection signal, so that the AC/DC converters and DC/DC conversion
Device is stopped.
2. the current foldback circuit of onboard charger as claimed in claim 1, it is characterised in that the current detecting unit bag
Current Hall sensor is included, the current Hall sensor is connected to the output end of the DC/DC converters.
3. the current foldback circuit of onboard charger as claimed in claim 2, it is characterised in that the DC/DC converters are
Resonant full bridge isolated converter, the resonant full bridge isolated converter includes the first bridge-type converter unit, the second bridge-type conversion list
Member and isolating transformer, the input of the first bridge-type converter unit is connected with the DC terminal of the AC/DC converters, described
The output end of first bridge-type converter unit is connected to the primary side of the isolating transformer, and the primary side of the isolating transformer connects
Connect the input of the second bridge-type converter unit, the output end of the second bridge-type converter unit be parallel with DC bus capacitor,
And as the output end of the DC/DC converters, the current Hall sensor is connected to the positive terminal of the DC bus capacitor.
4. the current foldback circuit of onboard charger as claimed in claim 3, it is characterised in that the AC/DC converters are
Three-phase bridge inverter, the exchange end of the three-phase bridge inverter is to connect power network or motor, the three-phase bridge
The DC terminal of converter is parallel with bus capacitor.
5. the current foldback circuit of the onboard charger as any one of claim 1-4, it is characterised in that the SiC
Switching tube is SiC power field effect pipes.
6. the current foldback circuit of onboard charger as claimed in claim 1, it is characterised in that the over-current protecting unit bag
Include：
It is connected on first resistor, second resistance and 3rd resistor between reference voltage power supply and ground, the second resistance and institute
Stating has first node between 3rd resistor；
Comparator, the negative input end of the comparator is connected with the output end of the current detecting unit, and the comparator is just
Input is connected with the first node；
4th resistance, one end of the 4th resistance is connected with the first default power supply, the other end of the 4th resistance with it is described
The output end of comparator is connected；
5th resistance, one end of the 5th resistance is connected with the output end of the comparator；
6th resistance, one end of the 6th resistance is connected with the other end of the 5th resistance, the 6th resistance it is another
End ground connection；
First electric capacity, first electric capacity and the 6th resistor coupled in parallel.
7. the current foldback circuit of onboard charger as claimed in claim 6, it is characterised in that the over-current protecting unit is also
Including：
Amplifier, the positive input terminal of the amplifier other end respectively with the 5th resistance and one end of the 6th resistance
It is connected, the negative input end of the amplifier is connected with the output end of the amplifier, the power end of the amplifier and described the
One default power supply is connected；
Second electric capacity, one end of second electric capacity is connected with the power end of the amplifier, the other end of second electric capacity
Ground connection；
7th resistance, one end of the 7th resistance is connected with the output end of the amplifier, the other end of the 7th resistance
It is connected with described control unit；
3rd electric capacity, one end of the 3rd electric capacity is connected with the other end of the 7th resistance, the 3rd electric capacity it is another
End ground connection.
8. the current foldback circuit of onboard charger as claimed in claim 7, it is characterised in that the over-current protecting unit is also
Including：
First clamp diode, the plus earth of first clamp diode；
Second clamp diode, the anode of second clamp diode is connected with the negative electrode of first clamp diode, institute
Stating has Section Point between the anode of the second clamp diode and the negative electrode of first clamp diode, second clamp
The negative electrode of diode is connected with the described first default power supply, and the Section Point is connected with the other end of the 7th resistance.
9. a kind of onboard charger, it is characterised in that include the mistake of the onboard charger as any one of claim 1-8
Flow protection circuit.
10. a kind of electric automobile, it is characterised in that including onboard charger as claimed in claim 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621412119.0U CN206379716U (en) | 2016-12-21 | 2016-12-21 | Electric automobile, onboard charger and its current foldback circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621412119.0U CN206379716U (en) | 2016-12-21 | 2016-12-21 | Electric automobile, onboard charger and its current foldback circuit |
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| CN206379716U true CN206379716U (en) | 2017-08-04 |
Family
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|---|---|---|---|
| CN201621412119.0U Active CN206379716U (en) | 2016-12-21 | 2016-12-21 | Electric automobile, onboard charger and its current foldback circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107591776A (en) * | 2017-09-22 | 2018-01-16 | 深圳市华星光电技术有限公司 | A kind of current foldback circuit of power supply |
| CN109484232A (en) * | 2018-11-14 | 2019-03-19 | 蔚来汽车有限公司 | Charging power modules, charge power supply and charging unit comprising it |
| CN109683584A (en) * | 2018-11-28 | 2019-04-26 | 上海松岳电源科技有限公司 | A kind of failure monitoring and guard method of two-way Vehicular charger system |
| WO2022253279A1 (en) | 2021-06-03 | 2022-12-08 | 浙江富特科技股份有限公司 | Current sampling circuit applied to bidirectional ac-dc converter |
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2016
- 2016-12-21 CN CN201621412119.0U patent/CN206379716U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107591776A (en) * | 2017-09-22 | 2018-01-16 | 深圳市华星光电技术有限公司 | A kind of current foldback circuit of power supply |
| CN109484232A (en) * | 2018-11-14 | 2019-03-19 | 蔚来汽车有限公司 | Charging power modules, charge power supply and charging unit comprising it |
| CN109683584A (en) * | 2018-11-28 | 2019-04-26 | 上海松岳电源科技有限公司 | A kind of failure monitoring and guard method of two-way Vehicular charger system |
| WO2022253279A1 (en) | 2021-06-03 | 2022-12-08 | 浙江富特科技股份有限公司 | Current sampling circuit applied to bidirectional ac-dc converter |
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