CN108494262A - The special full isolation DC-DC converter of New-energy electric vehicle - Google Patents
The special full isolation DC-DC converter of New-energy electric vehicle Download PDFInfo
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- CN108494262A CN108494262A CN201810360755.0A CN201810360755A CN108494262A CN 108494262 A CN108494262 A CN 108494262A CN 201810360755 A CN201810360755 A CN 201810360755A CN 108494262 A CN108494262 A CN 108494262A
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Classifications
-
- 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
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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
- B60L1/00—Supplying electric power to auxiliary equipment of vehicles
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention relates to a kind of special full isolation DC DC converters of New-energy electric vehicle, including main control chip and the second control chip, high positive pressure control electric switch lock circuit, low pressure just to control electric switch lock circuit, input, output filter circuit, output rectification circuit, input, output overcurrent protection circuit, output voltage adjustment circuit, delay circuit, temperature control circuit and impulse output circuit；Also included isolation circuit, input terminal connect one group of NMOS tube, and output rectification circuit is arranged in the output end of driving circuit of the impulse output circuit as NMOS tube, isolation circuit；Output rectification circuit connects the IN2 feet of the second control chip all the way；The IN1 feet of the second control chip current test side are connect all the way；Third road connects output filter circuit, and the 4th tunnel connects output voltage detecting circuit.Input terminal and output end are kept apart by isolation circuit, realize completely isolated on electric appliance, fundamentally solves the electrical safety and reliability of New-energy electric vehicle.
Description
Technical field
The present invention relates to a kind of conversions for having and the D C high voltages of electromobile battery group being converted into D C12V low-voltages
Device is used for the lighting system of vehicle, and signal designation system and various ancillary apparatus provide specified operating voltage, belong to
Field of circuit technology.Specially a kind of special full isolation DC-DC converter of New-energy electric vehicle.
Background technology
As the living standard of the economic sustained and rapid development in China and people increasingly improves, the energy thus brought is tight
It opens and problem of environmental pollution is on the rise, country supports the development of New-energy electric vehicle energetically thus, to solve the energy and ring
The problem of border is polluted.
China's New-energy electric vehicle vehicle and part kernel component key technology are not yet broken through, and product cost is high, society
Meeting matching system is not perfect, and industrialization and marketing development are restricted.The invention is related to New-energy electric vehicle core zero
One of component, high-power full isolation D C-D C converters.
Invention content
The present invention provides a kind of special full isolation DC-DC converters of New-energy electric vehicle, are by electromobile battery
Voltage such as 48V, 60V, 64V, 72V etc. is converted into 12V, is the illuminator on electric vehicle, instrument, loudspeaker, windshield wiper, light
Instruction, fan, radio, the 12V low-voltage electrical appliances such as reverse image provide specified operating voltage.It can also be converted into 13.8V,
The voltages such as 14.2V are that the storage battery that vehicle low-voltage electrical apparatus is individually powered charges.The invention will be inputted by isolating transformer
End keeps apart with output end, realizes completely isolated on electric appliance, fundamentally solves the electric appliance of New-energy electric vehicle
Safety and reliability.And can realize input reverse-connection protection, input overpressure protection, input/output overcurrent protection, input/
The functions such as output short circuit protection and high temperature protection, power cut off delay, mono-/bis -/multiple-channel output, the invention are mainly used in new energy
On source electric car.
The present invention is achieved by the following technical solutions：A kind of special full isolation DC-DC conversions of New-energy electric vehicle
Device, including main control chip and the second control chip, high positive pressure control electric switch lock circuit, low pressure are just controlling electric switch lock circuit, input filter
Circuit, output rectification circuit, output filter circuit, input overcurrent protection circuit, output overcurrent protection circuit, output voltage adjustment
Circuit, delay circuit, temperature control circuit and impulse output circuit；The high positive pressure control electric switch lock circuit, low pressure are just controlling electric door lock electricity
Road is set to the input terminal of voltage, and connect the V CC feet for then accessing main control chip with delay circuit and temperature control circuit respectively；Electricity
Pressure input terminal setting input filter circuit and input overcurrent protection circuit, the input overcurrent protection circuit connect main control chip
The OUTPUT feet of ISENSE feet, main control chip are connected with impulse output circuit, and the COMP feet of main control chip connect output voltage tune
Whole circuit；It further include the isolation circuit by isolating transformer as critical piece；The input terminal of the isolation circuit connects one group
NMOS tube, driving circuit of the impulse output circuit as NMOS tube, the output end setting output rectification of the isolation circuit
Circuit；Output rectification circuit connects the IN2- feet of the second control chip all the way, for the second control chip power supply；The second control is connect all the way
The IN1- feet at coremaking piece current detecting end protect circuit as output overcurrent；Third road connects output filter circuit, and the 4th tunnel connects defeated
Go out voltage detecting circuit.
The high positive pressure control electric switch lock circuit, delay circuit and temperature control circuit are by the first zener diode and the 7th resistance
It is grounded with the 8th resistance of access and the 7th capacitance, the other end of the 7th capacitance after series connection；Wherein, the 8th resistance and the 7th capacitance are
The timing element of delay circuit；The base stage of third transistor is accessed by the 8th resistance, the 9th resistance is the base of third transistor
Pole biasing resistor, the other end of the 9th resistance and the emitter of third transistor are grounded jointly；The collector of third transistor is logical
The base stage that eleventh resistor accesses the 4th triode is crossed, the base stage of the 4th triode accesses the tenth resistance simultaneously, and emitter passes through
Twelfth resistor accesses one end of the 14th resistance and the 15th resistor coupled in parallel, the 14th resistance and the after being connected with the tenth resistance
The positive IN+V of the other end access input power of 15 resistance；The collector of 4th triode passes through thirteenth resistor access the
The base stage of five triodes；The base stage of 5th triode accesses the cathode of temperature detect switch (TDS) resistance and the second zener diode simultaneously；
The other end of temperature detect switch (TDS) resistance and the anode of the second zener diode are grounded jointly；The emitter of 5th triode accesses master control
The VCC feet of chip, the 9th capacitance, the power filtering capacitor that the tenth capacitance is main control chip.
The low pressure is just controlling electric switch lock circuit by third zener diode and series connection the 6th optocoupler control of the 33rd resistance
The anode at end, cathode connect output end ground connection；The emitter of 6th optocoupler output connects the ground of input power, the collector of output end
The base stage of the second triode is accessed by the 5th resistance, the base stage of the second triode is accessed in one end of the 6th resistance, as second
The base biasing resistor of triode, the other end access the second triode emitter after again simultaneously access input power anode IN+
V, the collector of the second triode connect the cathode of the first zener diode；The delay circuit of low pressure control electric switch lock circuit and temperature control electricity
Delay circuit, the temperature control circuit of Lu Yugao positive pressure control electric switch lock circuits are identical.
The input filter circuit after the first capacitance, the second capacitance, third capacitance and the 4th capacitance parallel connection by accessing circuit；
First diode, the second diodes in parallel access circuit play the function of input reverse-connection protection and input overpressure protection.
The input overcurrent protection after main control chip, the 19th resistance of over-current detection resistance and the 20th resistor coupled in parallel by leading to
The ISENSE feet for crossing the 21st resistance R21 access main control chips form current foldback circuit.
The impulse output circuit is to shake member as capacitance-resistance by main control chip, the 38th resistance and the 25th capacitance
Part, the 6th triode, the 7th triode, the 11st capacitance and high-frequency impulse output transformer collectively constitute impulse output circuit,
Driving circuit as NMOS tube.
The NMOS tube is set as the first NMOS tube and the second NMOS tube, and the secondary windings of high-frequency impulse output transformer is equipped with
2 groups of coils, the number of turns, phase all same, one group of coil after first resistor and third diodes in parallel by accessing the first NMOS tube
Grid G, and second resistance is connected between the grid G and source S of the first NMOS tube, after 3rd resistor and the series connection of the 14th capacitance
Access the drain D and source S of the first NMOS tube；Another group of coil after the 7th resistance and the 6th diodes in parallel by accessing NMOS
The grid G of pipe, and the two or eight resistance is connected between the grid G and source S of NMOS tube, the 12nd capacitance and the 22nd resistance string
The drain D and source S of the second NMOS tube are accessed after connection.
The NMOS tube is set as the first NMOS tube and the second NMOS tube, the drain D of the first NMOS tube and first group of Schottky
The cathode of one of diode diode is connected together, and anode connects the drain D of the second NMOS tube all the way, connects isolation all the way and becomes
The terminals and the 13rd capacitance of one armature winding of depressor；The source S of first NMOS tube all the way with isolating transformer
Another terminals connection of one armature winding, and connect with the cathode of one of second group of Schottky diode diode
Together, anode connects the source S of the second NMOS tube all the way, connects the anode of the 8th diode all the way, and the cathode of the 8th diode connects
Second inductance, the second inductance and anode and the 13rd capacitance phase with another diode of second group of Schottky diode
Even；The secondary of the isolating transformer is respectively connected to the anode of the tenth diode and the 12nd diode, is divided into not with the 20th
The cathode of the 12nd diode is accessed after six resistance the 17th capacitance of series connection, and diode is accessed after the 4th resistance the 6th capacitance of series connection
Cathode, form output rectification circuit.
After the cathode of 12nd diode and the cathode of the tenth diode are connected together, output inductor is connect all the way, one
Road connects the anode of the 9th diode, is connected with the 25th resistance the control source being followed by into voltage stabilizing chip by the 9th diode
End, by the way that, to the second control chip power supply, the 14th capacitance, the 16th capacitance is the input of voltage stabilizing chip after voltage stabilizing chip voltage stabilizing
Filter capacitor, the 4th zener diode are to protect that voltage stabilizing chip is not broken down by high-voltage the 15th capacitance and the 18th capacitance is voltage stabilizing
The filter capacitor of chip and the second control chip；The anode of 12nd diode again with the 31st resistance and the 32nd resistance
After parallel connection, the current detecting end IN1- feet of the second control chip are accessed all the way, circuit is protected as output overcurrent；31st electricity
Resistance and the 32nd resistance are output electric current measure resistance, and output inductor connects the 19th capacitance, the 20th capacitance, all the way
The output filter circuit of 21 capacitances, the 22nd capacitance composition；Output voltage inspection is accessed by the 46th resistance all the way
Slowdown monitoring circuit.
The output voltage adjustment circuit is by control chip, the 24th resistance of output voltage adjustment element, the 50th electricity
Resistance, the 49th resistance, accurate reference voltage and the 4th optocoupler A4 compositions.
The main control chip is U capacitance C2845B technical grade chips, is equipped with eight feet, including COMP feet, VFB feet,
ISENSE feet, RT/ CT feet, GROUND feet, OUTPUT feet, VCC feet and VREF feet；The second control chip is LM258
Technical grade chip, is equipped with eight feet, including OUT1 feet, IN1- feet, IN1+ feet, GND feet, IN2+ feet, IN2- feet, OUT2 feet and
VCC feet.
The beneficial effects of the invention are as follows：Input terminal and output end are kept apart by isolating transformer, realize electric appliance
On it is completely isolated, fundamentally solve the electrical safety and reliability of New-energy electric vehicle.And it can realize defeated
Enter reverse connecting protection, input overpressure protection, input/output overcurrent protection, input/output short-circuit protection and high temperature protection, power-off
Functions, the invention such as delay, mono-/bis -/multiple-channel output are mainly used on New-energy electric vehicle.
Description of the drawings
Fig. 1 is the circuit diagram left side part of the present invention.
Fig. 2 is circuit diagram right side part of the present invention.
Specific implementation mode
As shown in the picture, the special high-power full isolation D C-D C converters of a kind of New-energy electric vehicle, using DC-DC
Semibridge system topological structure, and using the control mode of closed loop, including main control chip and the second control chip, high positive pressure control electric door lock
Circuit, low pressure are just controlling electric switch lock circuit, input filter circuit, output rectification circuit, output filter circuit, input overcurrent protection electricity
Road, output overcurrent protection circuit, output voltage adjustment circuit, delay circuit, temperature control circuit and impulse output circuit；The high pressure
Positive control electric switch lock circuit, low pressure are just controlling the input terminal that electric switch lock circuit is set to voltage, and respectively with delay circuit and temperature control circuit
Then connection accesses the V CC of main control chip（7）Foot；Input filter circuit and input overcurrent protection electricity is arranged in voltage input end
Road, the input overcurrent protection circuit connect the ISENSE feet of main control chip（3）, the OUTPUT feet of main control chip（6）It is connected with arteries and veins
Rush output circuit, the COMP of main control chip（1）Foot connects output voltage adjustment circuit；Further include that master is used as by isolating transformer T1
Want the isolation circuit of component；The input terminal of the isolation circuit connects one group of NMOS tube, and the impulse output circuit is as NMOS
Output rectification circuit is arranged in the output end of the driving circuit of pipe, the isolation circuit；Output rectification circuit connects the second control all the way
The IN2- feet of coremaking piece（6）, for the second control chip power supply；The IN1- feet of the second control chip current test side are connect all the way（2）,
Circuit is protected as output overcurrent；Third road connects output filter circuit, and the 4th tunnel connects output voltage detecting circuit.
The high positive pressure control electric switch lock circuit, delay circuit and temperature control circuit are by the first zener diode ZD1 and the 7th
The other end after resistance R7 series connection with access the 8th resistance R8 and the 7th capacitance C7, the 7th capacitance C7 is grounded；Wherein, the 8th resistance
R8 and the 7th capacitance C7 is the timing element of delay circuit；Access the base stage of third transistor Q3 by the 8th resistance R8, the 9th
Resistance R9 is the base biasing resistor of third transistor Q3, and the other end of the 9th resistance R9 and the emitter of third transistor Q3 are total
With ground connection；The collector of third transistor Q3 accesses the base stage of the 4th triode Q4, the 4th triode by eleventh resistor R11
The base stage of Q4 accesses the tenth resistance R10 simultaneously, and emitter accesses the after being connected with the tenth resistance R10 by twelfth resistor R12
The other end of one end in parallel with the 15th resistance R15 14 resistance R14, the 14th resistance R14 and the 15th resistance R15 access
The positive IN+V of input power；The collector of 4th triode Q4 accesses the base of the 5th triode Q5 by thirteenth resistor R13
Pole；The base stage of 5th triode Q5 accesses the cathode of temperature detect switch (TDS) resistance RT and the second zener diode ZD2 simultaneously；Temperature control is opened
The anode of the other end and the second zener diode ZD2 of powered-down resistance RT is grounded jointly；The emitter access master of 5th triode Q5
The VCC feet of chip U1 are controlled, the 9th capacitance C9, the tenth capacitance C10 are the power filtering capacitor of main control chip.
When the functional switch ends triode DMS are connected with input power anode IN+V, the first zener diode ZD1 and and
7th resistance R7 forms regulator circuit, and stable operating voltage is provided for delay circuit.The 7th capacitance C7 charges simultaneously, with
This third transistor Q3 conducting simultaneously, and then the 4th triode Q4 is also switched on, the 5th triode Q5 is also accordingly connected, main control chip
U1 must be electrically activated, and be started to work.When the functional switch ends triode DMS and input power anode IN+V are disconnected, due to the 7th electricity
Hold the presence of C7, circuit will not be stopped immediately.7th capacitance C7 starts to discharge, and discharge time is by the 8th resistance R8 and the 7th
The size of capacitance C7 determines.Third transistor Q3 continues to be connected, and the circuit being connected with this works on, when the 7th capacitance C7 is discharged
After electricity, third transistor Q3 ends immediately, and the circuit being connected with this is stopped.To realize the function of power cut off delay.When
When converter makes its temperature be increased to the operating temperature of temperature detect switch (TDS) because of the work of long-term heavy load, normally opened contact is closed, and makes the 5th
Triode Q5 base earths, the 5th triode Q5 become ending from being connected, and main control chip U1 dead electricity is stopped, and converter stops
Output.When temperature drops to the recovery action temperature of temperature detect switch (TDS), contact disconnects, and the 5th triode Q5 base stages is made to restore original
Conducting state, main control chip U1 obtain electric start-up operation, and converter normally exports.
The low pressure is just controlling electric switch lock circuit by third zener diode ZD3 and the 33rd resistance R33 the 6th light of series connection
The anode of coupling A6 control terminals, cathode connect output end ground connection；The emitter of 6th optocoupler A6 output ends connects the ground of input power, output
The collector at end accesses the base stage of the second triode Q2 by the 5th resistance R5, and the second triode is accessed in one end of the 6th resistance R6
The base stage of Q2, it is again same after the emitter of the second triode Q2 of other end access as the base biasing resistor of the second triode Q2
When access input power anode IN+V, the collector of the second triode Q2 connects the cathode of the first zener diode ZD1；Low pressure control electricity
Delay circuit, the temperature control circuit of door lock circuit are identical as high delay circuit, the temperature control circuit of positive pressure control electric switch lock circuit.When first
When trigger JK1 is connected with the anode of low pressure such as 12V, third zener diode ZD3 and the 33rd resistance R33 form voltage stabilizing electricity
Road provides stable operating voltage for the 6th optocoupler A6.Light emitting diode in 6th optocoupler A6 obtains electric, and efferent duct is made to be connected,
And then make the second NMOS tube Q8 conducting, the operation principle of circuit is equal to high positive pressure control electric switch lock circuit at this time, delay circuit with
And temperature control circuit.
Due to having often electricity on New-energy electric vehicle, central controlled lock system, burglary-resisting system, loudspeaker, double sudden strains of a muscle etc. are just can guarantee
Normal work.Therefore, the invention is equipped with mono-/bis -/multiple output function, mainly by the second trigger JK2, D0 and JP1 composition.
This function needs short circuit the first trigger JP1, keeps high positive pressure control electric switch lock circuit, temperature control circuit in running order always, this
When delay circuit do not work, and then all circuits is made to be completely in working condition ,+OUT1 often has that 12V is electric, to being provided on vehicle
The electric appliance for often having electricity is needed to be powered.When the second trigger JK2 is connected with+OUT1, the second trigger JK2 normally opened contacts
It is closed ,+OUT2 exports 12V, need not often have the electric appliance of electricity to be powered to vehicle.
After the input filter circuit is by the first capacitance C1, the second capacitance C2, third capacitance C3 and the 4th capacitance C4 parallel connections
Access circuit；First diode D1, the second diode D2 parallel connections access circuit play input reverse-connection protection and input overpressure protection
Function.
The input overcurrent protection by main control chip U1, the 19th resistance 19 of over-current detection resistance and the 20th resistance 20 simultaneously
The 3rd foot ISENSE feet for accessing main control chip U1 after connection by the 21st resistance R21 form current foldback circuit.
The impulse output circuit is by main control chip U1, the 38th resistance R38 and the 25th capacitance C25 as resistance
Hold concussion element, the 6th triode Q6, the 7th triode Q7, the 11st capacitance C11 and high-frequency impulse output transformer T2 are common
Form impulse output circuit, the driving circuit as the first NMOS tube Q1 and the second NMOS tube Q8.
When input current is because of the maximum input current that some reason is more than that design allows, the 3rd foot of main control chip U1
ISENSE foot voltages rise, and by the output pulse duty factor of the 6th foot OUTPUT feet of main control chip U1 internal adjustments, make the six or three
Pole pipe Q6, the 7th triode Q7 are in cut-off state, and all circuits of rear class is promoted to be stopped, after troubleshooting, each circuit
Voluntarily restore normal work, to form input overcurrent protection circuit.
The output voltage adjustment circuit is by main control chip U1, the 24th resistance R24 of output voltage adjustment element, the 5th
Ten resistance R50, the 49th resistance R49, accurate reference voltage U3 and the 4th optocoupler A4 compositions；When output voltage is because when output
When too low or too high for voltage, the 24th resistance R24 of accurate reference voltage U3 and output voltage adjustment element, the 50th resistance
The collective effect of R50 and the 49th resistance R49 provide sampling voltage, pass through the of the 4th optocoupler A4 feedback and main control chip U1
2.5V reference voltages in 1 foot COMP feet control the output pulse duty factor of the 6th foot OUTPUT feet more afterwards, to keep output electric
Pressure is stablized.
The main control chip U1, the 38th resistance R38 and the 25th capacitance C25 as capacitance-resistance shake element, the 6th
Triode Q6, the 7th triode Q7, the 11st capacitance C11 and high-frequency impulse output transformer T2 collectively constitute pulse output electricity
Road, the driving circuit as NMOS tube Q1, NMOS tube Q8.
The 38th resistance R38 of the Master control chip U1 and capacitance-resistance concussion element, the 25th capacitance C25 generate concussion
The pulse that frequency is about 40Khz, by the 6th triode Q6, the 7th triode Q7 composition triode complementation amplifying circuit after,
High-frequency impulse is transferred to by the 11st capacitance C11 and exports transformer T2, forms the driving of the first NMOS tube Q1, the second NMOS tube Q8
Circuit.The secondary windings that high-frequency impulse exports transformer T2 is equipped with 2 groups of coils, and the number of turns, all sames such as phase, purpose is exactly to protect
Demonstrate,prove correct opening time and the driving voltage of the first NMOS tube Q1 and the second NMOS tube Q8, pulse it is identical.One group of coil passes through
Access the grid G of the first NMOS tube Q1 after first resistor R1 and third diode D3 parallel connections, and the grid G of the first NMOS tube Q1 and
The drain electrode that the first NMOS tube Q1 is accessed after second resistance R2,3rd resistor R3 and the 14th capacitance C14 connect is connected between source S
D and source S；Another group of coil by accessing the grid G of NMOS tube Q8 after the 7th resistance R7 and the 6th diode D6 parallel connections, and
The two or eight resistance R18, the 12nd capacitance C12 and the 22nd resistance R22 strings are connected between the grid G and source S of NMOS tube Q8
Access the drain D and source S of the second NMOS tube Q8 after connection, the purpose of this connection be primarily used to the first NMOS tube Q1 of protection and
Second NMOS tube Q8.
The NMOS tube is set as the first NMOS tube and the second NMOS tube, the drain D of the first NMOS tube Q1 and first group of Xiao Te
The cathode of one of based diode D4 diodes is connected together, and anode connects the drain D of the second NMOS tube Q8 all the way, connects all the way
The terminals and the 13rd capacitance C13 of an armature winding of isolating transformer T1；The source S of first NMOS tube Q1 all the way with
Another terminals of an armature winding of isolating transformer T1 connect, and with wherein the one of second group of Schottky diode D7
The cathode of a diode is connected together, and anode connects the source S of the second NMOS tube Q8 all the way, connects the sun of the 8th diode D8 all the way
Pole, the cathode of the 8th diode D8 meet the second inductance L2, the second inductance L2 again with second group of Schottky diode D7 another
The anode of diode and the 13rd capacitance C13 are connected；The secondary of the isolating transformer T1 is respectively connected to the tenth diode D10
With the anode of the 12nd diode D12, it is divided into after not connecting the 17th capacitance C17 with the 26th resistance R26 and accesses the 12nd
The cathode of diode D12, the 4th resistance R4 connect the cathode of access diode D10 after the 6th capacitance C6, composition output rectified current
Road.After the cathode of 12nd diode D12 and the cathode of the tenth diode D10 are connected together, output inductor L1 is met all the way,
The anode for meeting the 9th diode D9 all the way accesses voltage stabilizing chip after connecting with the 25th resistance R25 by the 9th diode D9
The voltage input end of Q9, by powering to the second control chip U2 after voltage stabilizing chip Q9 voltage stabilizings, the 14th capacitance C14, the 16th
Capacitance C16 is the input filter capacitor of voltage stabilizing chip Q9, and the 4th zener diode ZD4 is that voltage stabilizing chip Q9 is protected not hit by high pressure
Wear the filter capacitor that the 15th capacitance C15 and the 18th capacitance C18 is the control chips of voltage stabilizing chip Q9 and second U2.
After the anode of 12nd diode D12 is again in parallel with the 31st resistance R31 and the 32nd resistance R32, all the way
The 2nd feet of current detecting end IN1- of the second control chip of access U2, circuit is protected as output overcurrent；31st resistance R31
It is output electric current measure resistance with the 32nd resistance R32, mono- tunnels output inductor L1 connect the 19th capacitance C19, the 20th
The output filter circuit of capacitance C20, the 21st capacitance C21, the 22nd capacitance C22 compositions；Pass through the 46th electricity all the way
It hinders R46 and accesses output voltage detecting circuit.
When output current is because of the maximum output current that some reason is more than that design allows, the 2nd of the second control chip U2 the
Foot IN1- feet make the 7th foot OUT2 feet export a high level by internal adjustment, by after the 47th resistance R47 with the
The anode of light emitting diode inside five optocoupler A5 is connected, phototriode conducting, through the electricity of the 14th diode D14 and the 40th
The base stage of the first NMOS tube Q1 is accessed after resistance R40 series connection, after the first NMOS tube Q1 conductings, through the electricity of the 13rd D13 and the 34th
Resistance R34 series connection is followed by the 3rd foot ISENSE feet into main control chip U1, and output overcurrent protection at this time has been converted into input overcurrent guarantor
Shield, operation principle etc. is same, no longer illustrates herein.
The output inductor L1 is ring-shaped inductors.
The second inductance L2 is bar magnet inductance.
The isolating transformer T1 is toroidal transformer.
The high-frequency impulse output transformer T2 is EE type transformers.
The model U capacitance C2845B technical grade chips of the control chip U1.
The model LM258 technical grade chips of the control chip U2.
The main control chip U1 is equipped with eight feet, including the 1st foot COMP feet, the 2nd foot VFB feet, the 3rd foot ISENSE feet, and the 4th
Foot RT/ CT feet, the 5th foot GROUND feet, the 6th foot OUTPUT feet, the 7th foot VCC feet, the 8th foot VREF feet.
The second control chip U2 is equipped with eight feet, including the 1st foot OUT1, the 2nd foot IN1- feet, the 3rd foot IN1+ feet, the
4 foot GND feet, the 5th foot IN2+ feet, the 6th foot IN2- feet, the 7th foot OUT2 feet, the 8th foot VCC feet.
Claims (10)
1. a kind of special full isolation DC-DC converter of New-energy electric vehicle, including main control chip and the second control chip, high pressure
Positive control electric switch lock circuit, low pressure are just controlling electric switch lock circuit, input filter circuit, output rectification circuit, output filter circuit, input
Current foldback circuit, output overcurrent protection circuit, output voltage adjustment circuit, delay circuit, temperature control circuit and pulse output electricity
Road；The high positive pressure control electric switch lock circuit, low pressure just controlling electric switch lock circuit be set to voltage input terminal, and respectively with delay circuit
The V CC feet for then accessing main control chip are connected with temperature control circuit；Input filter circuit and input overcurrent is arranged in voltage input end
Circuit, the input overcurrent protection circuit is protected to connect the ISENSE feet of main control chip, the OUTPUT feet of main control chip are connected with arteries and veins
Output circuit is rushed, the COMP feet of main control chip connect output voltage adjustment circuit；Further include by isolating transformer as main portion
The isolation circuit of part；The input terminal of the isolation circuit connects one group of NMOS tube, and the impulse output circuit is as NMOS tube
Output rectification circuit is arranged in the output end of driving circuit, the isolation circuit；Output rectification circuit connects the second control core all the way
The IN2- feet of piece, for the second control chip power supply；The IN1- feet for connecing the second control chip current test side all the way, as exporting
Stream protection circuit；Third road connects output filter circuit, and the 4th tunnel connects output voltage detecting circuit.
2. the special full isolation DC-DC converter of a kind of New-energy electric vehicle according to claim 1, characterized in that institute
State high positive pressure control electric switch lock circuit, delay circuit and temperature control circuit by the first zener diode and the 7th resistance series connection after with connect
Enter the 8th resistance and the 7th capacitance, the other end ground connection of the 7th capacitance；Wherein, the 8th resistance and the 7th capacitance are delay circuit
Timing element；The base stage of third transistor is accessed by the 8th resistance, the 9th resistance is the base biasing resistor of third transistor,
The other end of 9th resistance and the emitter of third transistor are grounded jointly；The collector of third transistor passes through eleventh resistor
Access the base stage of the 4th triode, the base stage of the 4th triode accesses the tenth resistance simultaneously, emitter by twelfth resistor with
Tenth resistance accesses one end of the 14th resistance and the 15th resistor coupled in parallel after being connected, the 14th resistance and the 15th resistance it is another
The positive IN+V of input power is accessed in one end；The collector of 4th triode accesses the base of the 5th triode by thirteenth resistor
Pole；The base stage of 5th triode accesses the cathode of temperature detect switch (TDS) resistance and the second zener diode simultaneously；Temperature detect switch (TDS) resistance
The anode of the other end and the second zener diode be grounded jointly；The VCC feet of the emitter access main control chip of 5th triode,
9th capacitance, the power filtering capacitor that the tenth capacitance is main control chip.
3. the special full isolation DC-DC converter of a kind of New-energy electric vehicle according to claim 1, characterized in that institute
The anode that low pressure is just controlling electric switch lock circuit by third zener diode and the 33rd resistance the 6th optocoupler control terminal of series connection is stated, it is cloudy
Pole connects output end ground connection；The emitter of 6th optocoupler output connects the ground of input power, and the collector of output end passes through the 5th electricity
The base stage of the second triode, the base as the second triode are accessed in the base stage of resistance the second triode of access, one end of the 6th resistance
Pole biasing resistor, the other end access the second triode emitter after again simultaneously access input power anode IN+V, the two or three pole
The collector of pipe connects the cathode of the first zener diode；The delay circuit of low pressure control electric switch lock circuit and temperature control circuit and high positive pressure
Delay circuit, the temperature control circuit for controlling electric switch lock circuit are identical.
4. the special full isolation DC-DC converter of a kind of New-energy electric vehicle according to claim 1, characterized in that institute
Input filter circuit is stated by accessing circuit after the first capacitance, the second capacitance, third capacitance and the 4th capacitance parallel connection；One or two pole
Pipe, the second diodes in parallel access circuit play the function of input reverse-connection protection and input overpressure protection；The input overcurrent is protected
Shield by the 21st resistance after main control chip, the 19th resistance of over-current detection resistance and the 20th resistor coupled in parallel by accessing master control
The ISENSE feet of chip form current foldback circuit.
5. the special full isolation DC-DC converter of a kind of New-energy electric vehicle according to claim 1, characterized in that institute
State impulse output circuit be by main control chip, the 38th resistance and the 25th capacitance as capacitance-resistance shake element, the six or three
Pole pipe, the 7th triode, the 11st capacitance and high-frequency impulse output transformer collectively constitute impulse output circuit, as NMOS tube
Driving circuit.
6. the special full isolation DC-DC converter of a kind of New-energy electric vehicle according to claim 5, characterized in that institute
It states NMOS tube and is set as the first NMOS tube and the second NMOS tube, the secondary windings that high-frequency impulse exports transformer is equipped with 2 groups of coils, circle
Number, phase all same, one group of coil by accessing the grid G of the first NMOS tube after first resistor and third diodes in parallel, and
It is connected to second resistance between the grid G and source S of first NMOS tube, first is accessed after 3rd resistor and the series connection of the 14th capacitance
The drain D and source S of NMOS tube；The grid that another group of coil passes through access NMOS tube after the 7th resistance and the 6th diodes in parallel
G, and the two or eight resistance is connected between the grid G and source S of NMOS tube, the 12nd capacitance and the series connection of the 22nd resistance be followed by into
The drain D and source S of second NMOS tube.
7. the special full isolation DC-DC converter of a kind of New-energy electric vehicle according to claim 1, characterized in that institute
State NMOS tube and be set as the first NMOS tube and the second NMOS tube, the drain D of the first NMOS tube and first group of Schottky diode its
In the cathode of a diode be connected together, anode connects the drain D of the second NMOS tube all the way, meets one of isolating transformer all the way
The terminals of armature winding and the 13rd capacitance；The source S of first NMOS tube all the way with a primary of isolating transformer around
Another terminals connection of group, and be connected together with the cathode of one of second group of Schottky diode diode, sun
Pole connects the source S of the second NMOS tube all the way, connects the anode of the 8th diode all the way, and the cathode of the 8th diode connects the second inductance,
Second inductance is connected with the anode of another diode of second group of Schottky diode and the 13rd capacitance again；The isolation
The secondary of transformer is respectively connected to the anode of the tenth diode and the 12nd diode, is divided into and does not connect with the 26th resistance
The cathode of the 12nd diode is accessed after 17 capacitances, and the cathode of diode, composition are accessed after the 4th resistance the 6th capacitance of series connection
Output rectification circuit.
8. the special full isolation DC-DC converter of a kind of New-energy electric vehicle according to claim 7, characterized in that the
After the cathode of the cathode of 12 diodes and the tenth diode is connected together, output inductor is connect all the way, connects the 9th 2 all the way
The anode of pole pipe is connected the voltage input end being followed by into voltage stabilizing chip by the 9th diode with the 25th resistance, by steady
To the second control chip power supply after pressure chip voltage stabilizing, the 14th capacitance, the 16th capacitance is the input filter capacitor of voltage stabilizing chip,
4th zener diode is to protect that voltage stabilizing chip is not broken down by high-voltage the 15th capacitance and the 18th capacitance is voltage stabilizing chip and
The filter capacitor of two control chips；The anode of 12nd diode again with after the 31st resistance and the 32nd resistor coupled in parallel,
The current detecting end IN1- feet of the second control of access chip all the way, circuit is protected as output overcurrent；31st resistance and
32 resistance are output electric current measure resistance, and output inductor connects the 19th capacitance, the 20th capacitance, the 21st all the way
The output filter circuit of capacitance, the 22nd capacitance composition；Output voltage detecting circuit is accessed by the 46th resistance all the way.
9. the special full isolation DC-DC converter of a kind of New-energy electric vehicle according to claim 1, characterized in that institute
Output voltage adjustment circuit is stated by control chip, the 24th resistance of output voltage adjustment element, the 50th resistance, the 49th
Resistance, accurate reference voltage and the 4th optocoupler A4 compositions.
10. the special full isolation DC-DC converter of a kind of New-energy electric vehicle according to claim 1, characterized in that institute
It is U capacitance C2845B technical grade chips to state main control chip U1, is equipped with eight feet, including the 1st foot COMP feet, the 2nd foot VFB feet, the 3rd
Foot ISENSE feet, the 4th foot RT/ CT feet, the 5th foot GROUND feet, the 6th foot OUTPUT feet, the 7th foot VCC feet, the 8th foot VREF feet；
The second control chip U2 is LM258 technical grade chips, is equipped with eight feet, including the 1st foot OUT1 feet, the 2nd foot IN1- feet, the
3 foot IN1+ feet, the 4th foot GND feet, the 5th foot IN2+ feet, the 6th foot IN2- feet, the 7th foot OUT2 feet, the 8th foot VCC feet.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810360755.0A CN108494262A (en) | 2018-04-20 | 2018-04-20 | The special full isolation DC-DC converter of New-energy electric vehicle |
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|---|---|---|---|
| CN201810360755.0A CN108494262A (en) | 2018-04-20 | 2018-04-20 | The special full isolation DC-DC converter of New-energy electric vehicle |
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| CN117713198A (en) * | 2023-12-08 | 2024-03-15 | 广州云酷智能设备有限公司 | Grid-connected inverter control core module and photovoltaic power conversion cabinet |
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