CN116207992A - Reverse pre-charging control method for vehicle-mounted three-port direct current converter - Google Patents
Reverse pre-charging control method for vehicle-mounted three-port direct current converter Download PDFInfo
- Publication number
- CN116207992A CN116207992A CN202211723533.3A CN202211723533A CN116207992A CN 116207992 A CN116207992 A CN 116207992A CN 202211723533 A CN202211723533 A CN 202211723533A CN 116207992 A CN116207992 A CN 116207992A
- Authority
- CN
- China
- Prior art keywords
- switching tube
- port
- voltage
- circuit
- vehicle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
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
- H02M3/3353—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 at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
- H02J7/04—Regulation of charging current or voltage
- H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
-
- 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
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4233—Arrangements for improving power factor of AC input using a bridge converter comprising active switches
-
- 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
- H02M3/33573—Full-bridge at primary side of an isolation transformer
-
- 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
- H02M3/33592—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 having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a reverse pre-charging control method of a vehicle-mounted three-port direct current converter, which comprises the steps of connecting an indirect bus capacitor at two ends of an A port and a capacitor of high-voltage electric equipment in parallel between two ends of a B port; a first switch is connected in series in a circuit from the bus capacitor to the mains supply; the high-voltage battery is connected with the second switch in series and then connected to two ends of a capacitor of the high-voltage electric equipment in parallel; the C-port circuit, the B-port circuit and the A-port circuit can realize forward and backward bidirectional power transmission; the switching on and off time sequence of the switching tube in the A port circuit, the B port circuit and the C port circuit is controlled, so that the vehicle-mounted three-port direct current converter works in the pre-charging mode 1 to realize that the energy is simultaneously transferred to the A port and the B port by the battery, or the vehicle-mounted three-port direct current converter works in the pre-charging mode 2 to realize that the energy is transferred to the B port by the battery. According to the vehicle-mounted three-port direct current converter reverse pre-charging control method, the reverse pre-charging function is realized without increasing extra hardware cost, the cost and the volume of the vehicle-mounted charging device are reduced, the energy transfer from the C port to the A, B port can be realized, and the pre-charging time is saved.
Description
Technical Field
The invention relates to a circuit, in particular to a reverse pre-charging control method for a vehicle-mounted three-port direct current converter.
Background
With the strengthening of energy conservation and emission reduction requirements of various countries, the market of electric automobiles is gradually expanded, and an on-board charging device (OBC/DCDC) is used as an interface of a commercial power, a low-voltage (lower than 50V) battery and a high-voltage (higher than 100V) battery, so that the on-board charging device plays an important role in the whole automobile. The high-voltage electric equipment of the whole vehicle and the internal direct current bus of the vehicle-mounted charger are commonly provided with mF-level large capacitors, and the large capacitors are directly charged without being controlled to generate very large surge current, so that related parts are easy to damage.
It is common practice in the art to add a pre-charge branch to a large capacitance pre-charge, which typically contains a pre-charge resistor, pre-charge relay or PTC (Positive Temperature Coefficient ) resistor. As shown in fig. 1, the bus capacitor C is first connected to the main relay switches K1, K2 via the precharge branch BUS And capacitor C of high-voltage electric equipment HV The slow charge is performed, and the main relay is closed again when the large capacitance voltage approaches the target voltage. Capacitor C for high-voltage electric equipment HV BAT of low-voltage battery can also be used LV Capacitor C for high-voltage electric equipment through low-voltage DC/DC converter HV As shown in fig. 2, high voltage battery BAT HV The side priming leg can be saved.
The charging device is increased in size and cost due to the addition of the pre-charging mode of the pre-charging branch, and the pre-charging resistance is a fixed value, so that the pre-charging time is not adjustable, and the flexibility is poor. The capacitor of the high-voltage electric equipment can be only precharged by the low-voltage DC/DC converter, and the capacitor of the OBC internal bus cannot be precharged at the same time.
Disclosure of Invention
The invention aims to solve the technical problem of providing a reverse pre-charging control method for a vehicle-mounted three-port direct current converter, which realizes the reverse pre-charging function without increasing extra hardware cost and reduces the cost and the volume of a vehicle-mounted charging device.
In order to solve the technical problems, the invention provides a reverse pre-charging control method for a vehicle-mounted three-port direct current converter, wherein the vehicle-mounted three-port converter comprises an A-port circuit, a B-port circuit and a C-port circuit; the B-port circuit and the A-port circuit and the C-port circuit transmit energy through a transformer; the A port of the A port circuit is used for being connected with a PFC bus of the vehicle-mounted charger, and the B port of the B port circuit is used for being connected with a high-voltage battery BAT HV The C port of the C port circuit is used for connecting with the BAT of the low-voltage battery LV The method comprises the steps of carrying out a first treatment on the surface of the Indirect bus capacitor C at both ends of A port BUS Capacitor C of high-voltage electric equipment is connected between two ends of B port in parallel HV ；
Bus capacitor C BUS A first switch K1 is connected in series in a loop to the mains supply;
high voltage battery BAT HV Capacitor C connected in series with second switch K2 and connected in parallel to high-voltage electric equipment HV Both ends;
the C-port circuit, the B-port circuit and the A-port circuit can realize forward and backward bidirectional power transmission;
the on-off time sequence of the switching tube in the A-port circuit, the B-port circuit and the C-port circuit is controlled to enable the vehicle-mounted three-port direct current converter to work in the pre-charging mode 1 to realize the BAT of the low voltage battery LV Energy is simultaneously transferred to the port A and the port B, or the vehicle-mounted three-port direct current converter works in the pre-charging mode 2 to realize the BAT of the low-voltage battery LV Energy is transferred only to the B port.
Preferably, the C-port circuit adopts a full-wave rectifying structure, a full-bridge rectifying structure or a double-current rectifying structure.
Preferably, the commercial power is single-phase alternating current or three-phase alternating current.
Preferably, the first switch K1 and the second switch K2 are relay switches.
Preferably, the method comprises the following steps:
s1, a charging gun is connected, and a vehicle-mounted three-port direct current converter is awakened;
s2, enabling the vehicle-mounted three-port direct current converter to work in a pre-charging mode 1 and a low-voltage battery BAT LV Simultaneously transmitting energy to the A port and the B port;
s3, when V BUS -V AC_PK >V TH_BUS ,V BUS Is bus capacitor C BUS Voltage of bus at two ends, V AC_PK The voltage peak value V of the alternating current input of the vehicle-mounted charger TH_BUS If the bus threshold voltage is the bus threshold voltage, closing a first switch K1, stopping sending gate driving signals of all switching tubes in the port A circuit, and performing step S4; when V is BUS -V AC_PK ≤V TH_BUS Step S2 is carried out;
s4, enabling the vehicle-mounted three-port direct current converter to work in a pre-charging mode 2 and a low-voltage battery BAT LV Delivering energy only to the B port;
s5, when V HV –V HV_CMD >V TH_HV ,V HV Capacitor C for high-voltage electric equipment HV Voltage at two ends, V HV_CMD In order to achieve a high pressure of the target,
V TH_HV if the voltage is the high-voltage threshold voltage, the second switch K2 is closed, and step S6 is performed; when V is HV –V HV_CMD ≤V TH_HV Step S4 is carried out;
s6, ending the pre-charging.
Preferably, in step S3, when V BUS -V AC_PK ≤V TH_BUS And the duration is less than or equal to the first set time, step S2 is performed, and if the duration is greater than the first set time, a fault state is entered.
Preferably, in step S5, when V HV –V HV_CMD ≤V TH_HV And the duration is less than or equal to the second set time, step S4 is performed, and if the duration is greater than the second set time, a fault state is entered.
Preferably, the vehicle-mounted three-port converter comprises a first transformer T1 and a second transformer T2, wherein the first transformer T1 and the second transformer T2 are mutually independent;
the first transformer T1 comprises a first magnetic core, an A-port side winding n1 and a first B-port side winding n2;
the second transformer T2 comprises a second magnetic core, a second B-port side winding n3 and a C-port side winding;
the C-port side winding comprises a C-port side first winding n4 and a C-port side second winding n5;
the A port circuit comprises a first switching tube S1, a second switching tube S2, a third switching tube S3 and a fourth switching tube S4; the first switching tube S1 and the second switching tube S2 form a first bridge arm, and the third switching tube S3 and the fourth switching tube S4 form a second bridge arm; the midpoint of the first bridge arm and the midpoint of the second bridge arm are respectively connected with two ends of an A-port side winding n1 of the first transformer T1, and two ends of the first bridge arm and the second bridge arm are used as A ports;
the B port circuit comprises a fifth switching tube S5, a sixth switching tube S6, a seventh switching tube S7, an eighth switching tube S8, a ninth switching tube S9 and a tenth switching tube S10; the fifth switching tube S5 and the sixth switching tube S6 form a third bridge arm; the seventh switching tube S7 and the eighth switching tube S8 form a fourth bridge arm; the ninth switching tube S9 and the tenth switching tube S10 form a fifth bridge arm; two ends of the third bridge arm, the fourth bridge arm and the fifth bridge arm are used as B ports; two ends of the first B port side winding n2 are respectively connected with a midpoint of the third bridge arm and a midpoint of the fourth bridge arm; two ends of the second B port side winding n3 are respectively connected with a midpoint of the fourth bridge arm and a midpoint of the fifth bridge arm;
the C port circuit comprises an eleventh switching tube S11, a twelfth switching tube S12, a thirteenth switching tube S13 and a fourteenth switching tube S14;
the source and drain ends of the twelfth switching tube S12 are respectively connected with the homonymous end of the first winding n4 at the C port side and the LV-working low-voltage negative end;
the source and drain ends of the eleventh switching tube S11 are respectively connected with the synonym end of the second winding n5 at the C port side and the working low-voltage negative end LV-;
one end of the source drain of the fourteenth switching tube S14 is connected with the homonymous end of the first winding n4 at the C port side, and the other end of the source drain is connected with a working low-voltage negative terminal LV-through a second clamping capacitor C2;
one end of the source drain of the thirteenth switching tube S13 is connected with the synonym end of the second winding n5 at the C port side, and the other end is connected with the working low-voltage negative terminal LV-;
one end of the filter inductor Lo is connected with the working low-voltage positive end LV+, and the other end of the filter inductor Lo is connected with the synonym end of the first winding n4 at the C port side and the homonym end of the second winding n5 at the C port side.
Preferably, the switching frequency of the switching tubes in the port A circuit, the port B circuit and the port C circuit is fs;
make on-vehicle three port direct current converter work in precharge mode 1 realize battery BAT LV When energy is simultaneously transferred to the A port and the B port, the first switch K1 and the first switch K2 are disconnected:
in the C-port circuit, an eleventh switching tube S11 and a twelfth switching tube S12 are complementarily conducted, and the conducting time is DT S The duty ratio is D;
the thirteenth switching tube S13 is complementarily conducted with the fourteenth switching tube S14;
when the thirteenth switching tube S13 is turned on, the eleventh switching tube S11 is turned off and the twelfth switching tube S12 is turned on;
when the fourteenth switching tube S14 is turned on, the eleventh switching tube S11 is turned on and the twelfth switching tube S12 is turned off;
in the port B circuit, the switching timing of the fifth switching tube S5, the eighth switching tube S8, and the ninth switching tube S9 is the same as that of the thirteenth switching tube S13;
the switching time sequence of the sixth switching tube S6, the seventh switching tube S7 and the tenth switching tube S10 is the same as that of the fourteenth switching tube S14;
as the voltage between the two ends of the port B connected with the high-voltage battery gradually rises, the on duty ratio D of the eleventh switching tube S11 and the twelfth switching tube S12 gradually increases from 0;
when D is less than or equal to 0.5, the first switching tube S1, the second switching tube S2, the third switching tube S3 and the fourth switching tube S4 in the port A circuit are all turned off and work in a passive rectification mode through a body diode;
the eleventh switching tube S11, the fourteenth switching tube S14, the sixth switching tube S6, the seventh switching tube S7 and the tenth switching tube S10 are synchronously conducted, and the conduction time is DT S ；
The twelfth switching tube S12, the thirteenth switching tube S13, the fifth switching tube S5, the eighth switching tube S8 and the ninth switching tube S9 are synchronously conducted, and the conduction time is the same as DT S ；
When D is more than 0.5, the first switching tube S1, the second switching tube S2, the third switching tube S3 and the fourth switching tube S4 in the port A circuit work in a PWM mode, and the conducting duty ratio is 1-D;
the first switching tube S1 and the fourth switching tube S4 are synchronously conducted;
the second switching tube S2 and the third switching tube S3 are synchronously conducted;
the conducting phase of the second switching tube S2 is 180 degrees different from that of the first switching tube S1;
the conducting phase of the first switching tube S1 leads the fifth switching tube S5 0 DEG to 150 DEG;
complementary conduction of the thirteenth switching tube S13 and the eleventh switching tube S11;
complementary conduction of the fourteenth switching tube S14 and the twelfth switching tube S12;
the eleventh switching tube S11 and the twelfth switching tube S12 are 180 degrees out of phase.
Preferably, the on duty ratio D of the eleventh switching tube S11 and the twelfth switching tube S12 of the C-port circuit is determined by the C-port current control loop and the B-port voltage control loop;
the voltage of the port B reaches the target voltage of the port B, and the second switch K2 is turned on.
Preferably, the angle of the fifth switching tube S5, which leads or lags the conducting phase of the second switching tube S2 and the first switching tube S1, is determined by the A-port voltage control loop;
when the voltage of the A port reaches the target voltage of the A port, the first switch K1 is turned on.
Preferably, the vehicle-mounted three-port direct current converter works in the precharge mode 2 to realize the BAT of the low-voltage battery LV When energy is transferred to the B port only:
opening the second switch K2;
in the C-port circuit, an eleventh switching tube S11 and a twelfth switching tube S12 are complementarily conducted, and the conducting time is DT S The duty ratio is D;
the thirteenth switching tube S13 is complementarily conducted with the fourteenth switching tube S14;
when the thirteenth switching tube S13 is turned on, the eleventh switching tube S11 is turned off and the twelfth switching tube S12 is turned on;
when the fourteenth switching tube S14 is turned on, the eleventh switching tube S11 is turned on and the twelfth switching tube S12 is turned off;
when the thirteenth switching tube S13 is turned on, the eleventh switching tube S11 is turned off and the twelfth switching tube S12 is turned on;
when the fourteenth switching tube S14 is turned on, the eleventh switching tube S11 is turned on and the twelfth switching tube S12 is turned off;
as the voltage between the two ends of the port B connected with the high-voltage battery gradually rises, the on duty ratio D of the eleventh switching tube S11 and the twelfth switching tube S12 gradually increases from 0;
in the port B circuit, a fifth switching tube S5, a sixth switching tube S6, a seventh switching tube S7, an eighth switching tube S8, a ninth switching tube S9 and a tenth switching tube S10 are all turned off;
in the A-port circuit, the first switching tube S1 and the third switching tube S3 are kept off, and the second switching tube S2 and the fourth switching tube S4 are kept off and kept on.
Preferably, when the voltage of the B-port reaches the B-port target voltage, the second switch K2 is turned on.
Preferably, the positive end of the first diode D1 is connected with the synonym end of the second winding n5 at the C port side, and the negative end is connected with the working low-voltage negative end LV-through the first clamping capacitor C1;
the positive end of the second diode D2 is connected with the same-name end of the first winding n4 at the C port side, and the negative end of the second diode D2 is connected with the working low-voltage negative end LV-through the second clamping capacitor C2.
Preferably, the eleventh switching tube S11, the twelfth switching tube S12, the thirteenth switching tube S13 and the fourteenth switching tube S14 are all insulated gate enhanced NMOS tubes;
the source end of the eleventh switching tube S11, the source end of the twelfth switching tube S12, the drain end of the thirteenth switching tube S13 and the drain end of the fourteenth switching tube S14 are all connected with the working low-voltage negative end LV-.
Preferably, the C-port circuit further comprises a filter capacitor Co;
and two ends of the filter capacitor Co are respectively connected with the working low-voltage positive end LV+ and the working low-voltage negative end LV-.
Preferably, the a-port circuit further comprises a resonant inductor Lr, a resonant capacitor Cr and an excitation inductor Lm;
two ends of the resonant inductor Lr are respectively connected with homonymous ends of the winding n1 at the midpoint of the first bridge arm and the port A;
two ends of the resonance capacitor Cr are respectively connected with the different name ends of the winding n1 at the midpoint of the second bridge arm and the side of the port A;
and two ends of the excitation inductor Lm are respectively connected with two ends of the winding n1 at the side of the port A at the midpoint of the second bridge arm.
Preferably, the B-port circuit further comprises leakage inductance Ls;
and two ends of the leakage inductance Ls are respectively connected with a midpoint of the fifth bridge arm and an n3 heteronymous end of the second B port side winding.
According to the vehicle-mounted three-port direct current converter reverse pre-charging control method, the pre-charging branches are not required to be added to the port A (bus port) and the port B (high-voltage battery port), so that the large capacitors of the port A (bus port) and the port B (high-voltage battery port) can be simultaneously pre-charged in a reverse direction, the reverse pre-charging function is realized, the cost of extra hardware is not increased, the cost and the volume of a vehicle-mounted charging device are reduced, the energy transfer from the port C to the port A, B can be simultaneously realized, and the pre-charging time is saved.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the following brief description of the drawings is given for the purpose of the present invention, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without the need for inventive work for a person skilled in the art.
FIG. 1 is a circuit diagram of a prior art DC converter using a precharge resistor and a relay for precharge;
fig. 2 is a circuit diagram of a DC converter pre-charged by a low voltage DC/DC converter according to the prior art;
FIG. 3 is a schematic diagram of a method for controlling reverse pre-charge of a vehicle-mounted three-port DC converter according to the present invention;
FIG. 4 is a schematic diagram of a vehicle three-port DC converter topology according to an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating a driving timing sequence of each port switching tube when the vehicle-mounted three-port DC converter according to an embodiment of the present invention is operating in the precharge mode 1;
FIG. 6 is a schematic diagram illustrating a driving timing sequence of each port switching tube when the vehicle-mounted three-port DC converter according to an embodiment of the present invention is operating in the precharge mode 2;
FIG. 7 is a block diagram of voltage-to-current control loop, duty cycle, and phase calculation of an embodiment of a method for reverse pre-charge control of a vehicle-mounted three-port DC converter of the present invention;
fig. 8 is a reverse pre-charge workflow diagram of an embodiment of a reverse pre-charge control method for a vehicle-mounted three-port dc converter according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by a person skilled in the art based on the embodiments of the invention without any inventive effort, are intended to fall within the scope of the invention.
The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention is further described below with reference to the drawings and specific examples, which are not intended to be limiting.
Example 1
As shown in FIG. 3, the vehicle-mounted three-port DC converter comprises an A-port circuit, a B-port circuit and a C-port circuit; the B-port circuit and the A-port circuit and the C-port circuit transmit energy through a transformer;
the A port of the A port circuit is used for connecting a PFC (power factor correction) bus of a vehicle-mounted charger, and the B port of the B port circuit is used for connecting a high-voltage (higher than 100V) battery BAT HV The C-port of the C-port circuit is used for connecting a low-voltage (less than 50V) battery BAT LV ；
Bus capacitor C connected between two ends of A port (bus port) BUS Capacitor C of high-voltage electric equipment is connected between two ends of B port (high-voltage battery port) in parallel HV ；
Bus capacitor C BUS A first switch K1 is connected in series in a loop to the mains supply;
high voltage battery BAT HV Capacitor C connected in series with second switch K2 and connected in parallel to high-voltage electric equipment HV Both ends;
the C-port circuit, the B-port circuit and the A-port circuit can realize forward and backward bidirectional power transmission;
the on-off time sequence of the switching tube in the A-port circuit, the B-port circuit and the C-port circuit is controlled to enable the vehicle-mounted three-port direct current converter to work in the pre-charging mode 1 to realize the BAT of the low voltage battery LV Energy is simultaneously transferred to the port A and the port B, or the vehicle-mounted three-port direct current converter works in the pre-charging mode 2 to realize the BAT of the low-voltage battery LV Energy is transferred only to the B port.
Preferably, the C-port circuit adopts a full-wave rectifying structure, a full-bridge rectifying structure or a current doubling rectifying structure and the like.
Preferably, the commercial power is single-phase alternating current or three-phase alternating current.
Preferably, the first switch K1 and the second switch K2 are relay switches.
According to the vehicle-mounted three-port direct current converter reverse pre-charging control method, the large capacitors of the A port (bus port) and the B port (high-voltage battery port) can be simultaneously pre-charged without adding pre-charging branches to the A port (bus port) and the B port (high-voltage battery port), the reverse pre-charging function is achieved, the additional hardware cost is not increased, the cost and the volume of a vehicle-mounted charging device are reduced, the energy transfer from the C port to the A, B port can be simultaneously achieved, and the pre-charging time is saved.
Example two
The reverse pre-charging control method of the vehicle-mounted three-port direct current converter based on the first embodiment, as shown in fig. 8, comprises the following steps:
s1, a charging gun is connected, and a vehicle-mounted three-port direct current converter is awakened;
s2, enabling the vehicle-mounted three-port direct current converter to work in a pre-charging mode 1 and a low-voltage battery BAT LV Simultaneously transmitting energy to the A port and the B port;
s3, when V BUS -V AC_PK >V TH_BUS ,V BUS Is bus capacitor C BUS Voltage of bus at two ends, V AC_PK The voltage peak value V of the alternating current input of the vehicle-mounted charger TH_BUS If the bus threshold voltage is the bus threshold voltage, closing a first switch K1, stopping sending gate driving signals of all switching tubes in the port A circuit, and performing step S4; when V is BUS -V AC_PK ≤V TH_BUS Step S2 is carried out;
s4, enabling the vehicle-mounted three-port direct current converter to work in a pre-charging mode 2 and a low-voltage battery BAT LV Delivering energy only to the B port;
s5, when V HV –V HV_CMD >V TH_HV ,V HV Capacitor C for high-voltage electric equipment HV Voltage at two ends, V HV_CMD In order to achieve a high pressure of the target,
V TH_HV if the voltage is the high-voltage threshold voltage, the second switch K2 is closed, and step S6 is performed; when V is HV –V HV_CMD ≤V TH_HV Step S4 is carried out;
s6, ending the pre-charging.
Preferably, in step S3, when V BUS -V AC_PK ≤V TH_BUS And the duration is less than or equal to the first set time, step S2 is performed, and if the duration is greater than the first set time, a fault state is entered.
Preferably, in step S5, when V HV –V HV_CMD ≤V TH_HV And the duration is less than or equal to the second set time, step S4 is performed, and if the duration is greater than the second set time, a fault state is entered.
In the reverse pre-charging control method of the vehicle-mounted three-port direct current converter of the second embodiment, the charging gun is connected to the wake-up vehicle-mounted three-port direct current converter and then enters the pre-charging working mode 1, so that the low-voltage (lower than 50V) battery BAT is enabled LV Energy is simultaneously transferred to an A port (bus port) and a B port (high-voltage battery port), and a vehicle-mounted charging device detects a bus capacitor C BUS Bus voltage V at two ends BUS When the bus capacitor C BUS Bus voltage V at two ends BUS Is larger than the alternating current input voltage peak value V of the vehicle-mounted charger AC_PK Exceeding the bus threshold voltage V TH_BUS When the bus capacitor is completely precharged, the port A is stopped to drive and close the first switch K1 at the AC end; subsequently enter precharge mode 2, low voltage (less than 50V) battery BAT LV Energy is only transferred to the port B (high-voltage battery port), and when the capacitor C of the high-voltage electric equipment HV Voltage V at two ends HV Greater than the target high pressure V HV_CMD Exceeding the high voltage threshold voltage V TH_HV Closing the second switch K2 to complete the capacitor C of the high-voltage electric equipment HV Is to be used for the priming of the battery. After the precharge is finished, the charging mode or the PTC heating mode can be entered according to the VCU (Vehicle Control Unit, vehicle controller) instruction.
Example III
According to the vehicle-mounted three-port direct current converter reverse pre-charging control method based on the first embodiment, as shown in fig. 4, the vehicle-mounted three-port converter comprises a first transformer T1 and a second transformer T2, and the first transformer T1 and the second transformer T2 are mutually independent;
the first transformer T1 comprises a first magnetic core, an A-port side winding n1 and a first B-port side winding n2;
the second transformer T2 comprises a second magnetic core, a second B-port side winding n3 and a C-port side winding;
the C-port side winding comprises a C-port side first winding n4 and a C-port side second winding n5;
the A port circuit comprises a first switching tube S1, a second switching tube S2, a third switching tube S3 and a fourth switching tube S4; the first switching tube S1 and the second switching tube S2 form a first bridge arm, and the third switching tube S3 and the fourth switching tube S4 form a second bridge arm; the midpoint of the first bridge arm and the midpoint of the second bridge arm are respectively connected with two ends of an A-port side winding n1 of the first transformer T1, and two ends of the first bridge arm and the second bridge arm are used as A ports;
the B port circuit comprises a fifth switching tube S5, a sixth switching tube S6, a seventh switching tube S7, an eighth switching tube S8, a ninth switching tube S9 and a tenth switching tube S10; the fifth switching tube S5 and the sixth switching tube S6 form a third bridge arm; the seventh switching tube S7 and the eighth switching tube S8 form a fourth bridge arm; the ninth switching tube S9 and the tenth switching tube S10 form a fifth bridge arm; two ends of the third bridge arm, the fourth bridge arm and the fifth bridge arm are used as B ports; two ends of the first B port side winding n2 are respectively connected with a midpoint of the third bridge arm and a midpoint of the fourth bridge arm; two ends of the second B port side winding n3 are respectively connected with a midpoint of the fourth bridge arm and a midpoint of the fifth bridge arm;
the C port circuit comprises an eleventh switching tube S11, a twelfth switching tube S12, a thirteenth switching tube S13 and a fourteenth switching tube S14;
the source and drain ends of the twelfth switching tube S12 are respectively connected with the homonymous end of the first winding n4 at the C port side and the LV-working low-voltage negative end;
the source and drain ends of the eleventh switching tube S11 are respectively connected with the synonym end of the second winding n5 at the C port side and the working low-voltage negative end LV-;
one end of the source drain of the fourteenth switching tube S14 is connected with the homonymous end of the first winding n4 at the C port side, and the other end of the source drain is connected with a working low-voltage negative terminal LV-through a second clamping capacitor C2;
one end of the source drain of the thirteenth switching tube S13 is connected with the synonym end of the second winding n5 at the C port side, and the other end is connected with the working low-voltage negative terminal LV-;
one end of the filter inductor Lo is connected with the working low-voltage positive end LV+, and the other end of the filter inductor Lo is connected with the synonym end of the first winding n4 at the C port side and the homonym end of the second winding n5 at the C port side.
In the reverse pre-charging control method of the vehicle-mounted three-port direct current converter in the third embodiment, the high-voltage DC/DC and the low-voltage DC/DC are integrated into one topology, and power conversion between the A-C port and the B-C port can be achieved.
Example IV
Based on the reverse pre-charge control method of the vehicle-mounted three-port direct current converter in the third embodiment, the positive end of the first diode D1 is connected with the synonym end of the second winding n5 at the C port side, and the negative end of the first diode D1 is connected with the working low-voltage negative end LV-;
the positive end of the second diode D2 is connected with the same-name end of the first winding n4 at the C port side, and the negative end of the second diode D2 is connected with the working low-voltage negative end LV-through the second clamping capacitor C2.
Preferably, the eleventh switching tube S11, the twelfth switching tube S12, the thirteenth switching tube S13 and the fourteenth switching tube S14 are all insulated gate enhanced NMOS tubes;
the source end of the eleventh switching tube S11, the source end of the twelfth switching tube S12, the drain end of the thirteenth switching tube S13 and the drain end of the fourteenth switching tube S14 are all connected with the working low-voltage negative end LV-.
Preferably, the method comprises the steps of,the C port circuit also comprises a filter capacitor Co;
the filter capacitorThe two ends of Co are respectively connected with the working low-voltage positive end LV+ and the working low-voltage negative end LV-.
Preferably, the a-port circuit further comprises a resonant inductor Lr, a resonant capacitor Cr and an excitation inductor Lm;
two ends of the resonant inductor Lr are respectively connected with homonymous ends of the winding n1 at the midpoint of the first bridge arm and the port A;
two ends of the resonance capacitor Cr are respectively connected with the different name ends of the winding n1 at the midpoint of the second bridge arm and the side of the port A;
and two ends of the excitation inductor Lm are respectively connected with two ends of the winding n1 at the side of the port A at the midpoint of the second bridge arm.
The resonance inductance Lr, the resonance capacitance Cr and the excitation inductance Lm form a resonance network.
Preferably, the B-port circuit further comprises leakage inductance Ls;
and two ends of the leakage inductance Ls are respectively connected with a midpoint of the fifth bridge arm and an n3 heteronymous end of the second B port side winding.
In the vehicle-mounted three-port direct current converter in the fourth embodiment, the C-port circuit of the vehicle-mounted three-port direct current converter uses full-wave rectification and an active clamping circuit, so that the voltage stress of a power device can be further reduced, and the charging efficiency of a vehicle-mounted low-voltage battery can be improved.
Example five
In the reverse pre-charging control method of the vehicle-mounted three-port direct current converter based on the third embodiment, as shown in fig. 5, the conducting frequency of the switching tube in the port A circuit, the port B circuit and the port C circuit is fs;
make on-vehicle three port direct current converter work in precharge mode 1 realize battery BAT LV When energy is simultaneously transferred to the A port and the B port, the first switch K1 and the first switch K2 are disconnected:
in the C-port circuit, an eleventh switching tube S11 and a twelfth switching tube S12 are complementarily conducted, and the conducting time is DT S The duty ratio is D;
the thirteenth switching tube S13 is complementarily conducted with the fourteenth switching tube S14;
when the thirteenth switching tube S13 is turned on, the eleventh switching tube S11 is turned off and the twelfth switching tube S12 is turned on;
when the fourteenth switching tube S14 is turned on, the eleventh switching tube S11 is turned on and the twelfth switching tube S12 is turned off;
in the port B circuit, the switching timing of the fifth switching tube S5, the eighth switching tube S8, and the ninth switching tube S9 is the same as that of the thirteenth switching tube S13;
the switching time sequence of the sixth switching tube S6, the seventh switching tube S7 and the tenth switching tube S10 is the same as that of the fourteenth switching tube S14;
as the voltage between the two ends of the port B connected with the high-voltage battery gradually rises, the on duty ratio D of the eleventh switching tube S11 and the twelfth switching tube S12 gradually increases from 0;
when D is less than or equal to 0.5, the first switching tube S1, the second switching tube S2, the third switching tube S3 and the fourth switching tube S4 in the port A circuit are all turned off and work in a passive rectification mode through a body diode;
the eleventh switching tube S11, the fourteenth switching tube S14, the sixth switching tube S6, the seventh switching tube S7 and the tenth switching tube S10 are synchronously conducted, and the conduction time is DT S ；
The twelfth switching tube S12, the thirteenth switching tube S13, the fifth switching tube S5, the eighth switching tube S8 and the ninth switching tube S9 are synchronously conducted, and the conduction time is the same as DT S ；
When D is more than 0.5, the first switching tube S1, the second switching tube S2, the third switching tube S3 and the fourth switching tube S4 in the port A circuit work in a PWM mode, and the conducting duty ratio is 1-D;
the first switching tube S1 and the fourth switching tube S4 are synchronously conducted;
the second switching tube S2 and the third switching tube S3 are synchronously conducted;
the conducting phase of the second switching tube S2 is 180 degrees different from that of the first switching tube S1;
the conducting phase of the first switching tube S1 leads the fifth switching tube S5 0 DEG to 150 DEG;
complementary conduction of the thirteenth switching tube S13 and the eleventh switching tube S11;
complementary conduction of the fourteenth switching tube S14 and the twelfth switching tube S12;
the eleventh switching tube S11 and the twelfth switching tube S12 are 180 ° out of phase.
Preferably, as shown in fig. 7, the on duty ratio D of the eleventh switching tube S11 and the twelfth switching tube S12 of the C-port circuit is determined by the C-port current control loop and the B-port voltage control loop;
the voltage of the port B reaches the target voltage of the port B, and the second switch K2 is turned on.
Preferably, as shown in fig. 7, the angle of the fifth switching tube S5 that the conducting phase Phi of the second switching tube S2 and the first switching tube S1 leads or lags is determined by the port a voltage control loop (according to the port a target voltage setting);
when the voltage of the A port reaches the target voltage of the A port, the first switch K1 is turned on.
In-vehicle embodiment fiveReverse pre-charge control method for three-port direct current converter, and pre-charge mode 1 is adopted to realize BAT of low-voltage battery LV When energy is simultaneously transferred to the port a and the port B, the eleventh switching tube S11, the twelfth switching tube S12, the thirteenth switching tube S13 and the fourteenth switching tube S14 of the C-port circuit operate in a PWM (pulse width modulation) mode, wherein the on duty ratio of the eleventh switching tube S11 and the twelfth switching tube S12 is D, and the on duty ratio of the thirteenth switching tube S13 and the fourteenth switching tube S14 and the eleventh switching tube S11 and the twelfth switching tube S12 maintain a certain logic relationship; a fifth switching tube S5, a sixth switching tube S6, a seventh switching tube S7, an eighth switching tube S8, a ninth switching tube S9 and a tenth switching tube S10 in the port B circuit work in a PWM mode to carry out synchronous rectification, and the on-duty ratio of the switching tubes keeps a certain logic relationship with an eleventh switching tube S11 and a twelfth switching tube S12; the first switching tube S1, the second switching tube S2, the third switching tube S3 and the fourth switching tube S4 of the A-port circuit work in a PWM mode, and the on duty ratio and the phase of the switching tube S are in a certain logic relation with the fifth switching tube S5 and the sixth switching tube S6.
Example six
In the reverse pre-charging control method of the vehicle-mounted three-port direct current converter based on the third embodiment, as shown in fig. 6, the vehicle-mounted three-port direct current converter is operated in the pre-charging mode 2 to realize the BAT of the low-voltage battery LV When energy is transferred to the B port only:
opening the second switch K2;
in the C-port circuit, an eleventh switching tube S11 and a twelfth switching tube S12 are complementarily conducted, and the conducting time is DT S The duty ratio is D;
the thirteenth switching tube S13 is complementarily conducted with the fourteenth switching tube S14;
when the thirteenth switching tube S13 is turned on, the eleventh switching tube S11 is turned off and the twelfth switching tube S12 is turned on;
when the fourteenth switching tube S14 is turned on, the eleventh switching tube S11 is turned on and the twelfth switching tube S12 is turned off;
when the thirteenth switching tube S13 is turned on, the eleventh switching tube S11 is turned off and the twelfth switching tube S12 is turned on;
when the fourteenth switching tube S14 is turned on, the eleventh switching tube S11 is turned on and the twelfth switching tube S12 is turned off;
as the voltage between the two ends of the port B connected with the high-voltage battery gradually rises, the on duty ratio D of the eleventh switching tube S11 and the twelfth switching tube S12 gradually increases from 0;
in the port B circuit, a fifth switching tube S5, a sixth switching tube S6, a seventh switching tube S7, an eighth switching tube S8, a ninth switching tube S9 and a tenth switching tube S10 are all turned off;
in the A-port circuit, the first switching tube S1 and the third switching tube S3 are kept off, and the second switching tube S2 and the fourth switching tube S4 are kept off and kept on.
Preferably, when the voltage of the B-port reaches the B-port target voltage, the second switch K2 is turned on.
In the reverse pre-charge control method of the vehicle-mounted three-port direct current converter in the sixth embodiment, the pre-charge mode 2 is adopted to realize the BAT of the low-voltage battery LV When energy is transferred to the B port only, the eleventh switching tube S11, the twelfth switching tube S12, the thirteenth switching tube S13 and the fourteenth switching tube S14 of the C port circuit operate in a PWM (pulse width modulation) mode, wherein the on duty ratio of the eleventh switching tube S11 and the twelfth switching tube S12 is D, and the on duty ratio of the thirteenth switching tube S13 and the fourteenth switching tube S14 and the eleventh switching tube S11 and the twelfth switching tube S12 maintain a certain logic relationship; all the switching tubes in the port B circuit are not conducted; in the A-port circuit, the first switching tube S1 and the third switching tube S3 are kept off, and the second switching tube S2 and the fourth switching tube S4 are kept off and kept on.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the invention.
Claims (18)
1. A reverse pre-charge control method of a vehicle-mounted three-port direct current converter comprises an A-port circuit, a B-port circuit and a C-port circuit; b-port circuit and A-port circuit and C-terminalThe port circuit transmits energy through a transformer; the A port of the A port circuit is used for connecting a PFC bus of the vehicle-mounted charger, and the B port of the B port circuit is used for connecting a high-voltage Battery (BAT) HV ) The C-port of the C-port circuit is used for connecting a low-voltage Battery (BAT) LV ) The method comprises the steps of carrying out a first treatment on the surface of the Characterized in that the indirect bus capacitor (C BUS ) A capacitor (C) of high-voltage electric equipment is connected between the two ends of the B port in parallel HV )；
Bus capacitor (C) BUS ) A first switch (K1) is connected in series in a circuit to the mains supply;
high-voltage Battery (BAT) HV ) Is connected in series with a second switch (K2) and then connected in parallel to a capacitor (C) of the high-voltage electric equipment HV ) Both ends;
the C-port circuit, the B-port circuit and the A-port circuit can realize forward and backward bidirectional power transmission;
the on-off time sequence of the switching tubes in the A-port circuit, the B-port circuit and the C-port circuit is controlled to enable the vehicle-mounted three-port direct current converter to work in the pre-charging mode 1 to realize a low-voltage Battery (BAT) LV ) Simultaneously transferring energy to the A port and the B port, or operating the vehicle-mounted three-port direct current converter in the precharge mode 2 to realize a low-voltage Battery (BAT) LV ) Energy is transferred only to the B port.
2. The reverse pre-charge control method of the vehicle-mounted three-port direct current converter according to claim 1, wherein,
the C port circuit adopts a full-wave rectifying structure, a full-bridge rectifying structure or a double-current rectifying structure.
3. The reverse pre-charge control method of the vehicle-mounted three-port direct current converter according to claim 1, wherein,
the commercial power is single-phase alternating current or three-phase alternating current.
4. The reverse pre-charge control method of the vehicle-mounted three-port direct current converter according to claim 1, wherein,
the first switch (K1) and the second switch (K2) are relay switches.
5. The reverse pre-charge control method of the vehicle-mounted three-port direct current converter according to claim 1, wherein,
the method comprises the following steps:
s1, a charging gun is connected, and a vehicle-mounted three-port direct current converter is awakened;
s2, enabling the vehicle-mounted three-port direct current converter to work in a pre-charging mode 1, and enabling a low-voltage Battery (BAT) LV ) Simultaneously transmitting energy to the A port and the B port;
s3, when V BUS -V AC_PK >V TH_BUS ,V BUS Is a bus capacitor (C) BUS ) Voltage of bus at two ends, V AC_PK The voltage peak value V of the alternating current input of the vehicle-mounted charger TH_BUS If the bus threshold voltage is the bus threshold voltage, closing a first switch (K1), stopping sending gate driving signals of all switching tubes in the port A circuit, and performing step S4; when V is BUS -V AC_PK ≤V TH_BUS Step S2 is carried out;
s4, enabling the vehicle-mounted three-port direct current converter to work in a pre-charging mode 2, and enabling a low-voltage Battery (BAT) LV ) Delivering energy only to the B port;
s5, when V HV –V HV_CMD >V TH_HV ,V HV Capacitor for high-voltage electric equipment (C) HV ) Voltage at two ends, V HV_CMD In order to achieve a high pressure of the target,
V TH_HV if the voltage is the high-voltage threshold voltage, closing a second switch (K2), and performing step S6; when V is HV –V HV_CMD ≤V TH_HV Step S4 is carried out;
s6, ending the pre-charging.
6. The method for reverse pre-charge control of a vehicle-mounted three-port DC converter according to claim 5, wherein,
in step S3, when V BUS -V AC_PK ≤V TH_BUS And the duration is less than or equal to the first set time, step S2 is performed, and if the duration is greater than the first set time, a fault state is entered.
7. The method for reverse pre-charge control of a vehicle-mounted three-port DC converter according to claim 5, wherein,
in step S5, when V HV –V HV_CMD ≤V TH_HV And the duration is less than or equal to the second set time, step S4 is performed, and if the duration is greater than the second set time, a fault state is entered.
8. The reverse pre-charge control method of the vehicle-mounted three-port direct current converter according to claim 1, wherein,
the vehicle-mounted three-port converter comprises a first transformer (T1) and a second transformer (T2), and the first transformer (T1) and the second transformer (T2) are mutually independent;
the first transformer (T1) comprises a first magnetic core, an A-port side winding (n 1) and a first B-port side winding (n 2);
the second transformer (T2) comprises a second magnetic core, a second B-port side winding (n 3) and a C-port side winding;
the C-port side winding comprises a C-port side first winding (n 4) and a C-port side second winding (n 5);
the A port circuit comprises a first switching tube (S1), a second switching tube (S2), a third switching tube (S3) and a fourth switching tube (S4); the first switching tube (S1) and the second switching tube (S2) form a first bridge arm, and the third switching tube (S3) and the fourth switching tube (S4) form a second bridge arm; the midpoint of the first bridge arm and the midpoint of the second bridge arm are respectively connected with two ends of an A-port side winding (n 1) of the first transformer (T1), and the two ends of the first bridge arm and the second bridge arm are used as A-ports;
the B port circuit comprises a fifth switching tube (S5), a sixth switching tube (S6), a seventh switching tube (S7), an eighth switching tube (S8), a ninth switching tube (S9) and a tenth switching tube (S10); the fifth switching tube (S5) and the sixth switching tube (S6) form a third bridge arm; the seventh switching tube (S7) and the eighth switching tube (S8) form a fourth bridge arm; the ninth switching tube (S9) and the tenth switching tube (S10) form a fifth bridge arm; two ends of the third bridge arm, the fourth bridge arm and the fifth bridge arm are used as B ports; two ends of the first B port side winding (n 2) are respectively connected with a midpoint of a third bridge arm and a midpoint of a fourth bridge arm; two ends of the second B port side winding (n 3) are respectively connected with the middle point of the fourth bridge arm and the middle point of the fifth bridge arm;
the C port circuit comprises an eleventh switching tube (S11), a twelfth switching tube (S12), a thirteenth switching tube (S13) and a fourteenth switching tube (S14);
the source and drain ends of the twelfth switching tube (S12) are respectively connected with the homonymous end of the first winding (n 4) at the C port side and the working low-voltage negative end (LV-);
the source and drain ends of the eleventh switching tube (S11) are respectively connected with the synonym end of the second winding (n 5) at the C port side and the working low-voltage negative end (LV-);
one end of the source drain of the fourteenth switching tube (S14) is connected with the same-name end of the first winding (n 4) at the C port side, and the other end of the source drain is connected with the working low-voltage negative end (LV-);
one end of the source drain of the thirteenth switching tube (S13) is connected with the synonym end of the second winding (n 5) at the C port side, and the other end of the source drain is connected with the working low-voltage negative end (LV-);
one end of the filter inductor (Lo) is connected with the working low-voltage positive end (LV+), and the other end of the filter inductor is connected with the synonym end of the first winding (n 4) at the C port side and the homonym end of the second winding (n 5) at the C port side.
9. The method for reverse pre-charge control of a vehicular three-port DC converter as defined in claim 8, wherein,
the conducting frequency of the switching tube in the port A circuit, the port B circuit and the port C circuit is fs;
operating a vehicle-mounted three-port DC converter in a pre-charge mode 1 to implement a low-voltage Battery (BAT) LV ) When energy is simultaneously transferred to the A port and the B port, the first switch (K1) and the first switch (K2) are disconnected:
in the C-port circuit, an eleventh switching tube (S11) and a twelfth switching tube (S12) are complementarily conducted, and the conducting time is DT S The duty ratio is D;
the thirteenth switching tube (S13) is complementarily conducted with the fourteenth switching tube (S14);
when the thirteenth switching tube (S13) is on, the eleventh switching tube (S11) is off and the twelfth switching tube (S12) is on;
when the fourteenth switching tube (S14) is turned on, the eleventh switching tube (S11) is turned on and the twelfth switching tube (S12) is turned off;
in the port B circuit, the switching time sequence of a fifth switching tube (S5), an eighth switching tube (S8) and a ninth switching tube (S9) is the same as that of a thirteenth switching tube (S13);
the switching time sequence of the sixth switching tube (S6), the seventh switching tube (S7) and the tenth switching tube (S10) is the same as that of the fourteenth switching tube (S14);
with the gradual rise of the voltage between the two ends of the B port connected with the high-voltage battery, the on duty ratio D of the eleventh switching tube (S11) and the twelfth switching tube (S12) is gradually increased from 0;
when D is less than or equal to 0.5, a first switching tube (S1), a second switching tube (S2), a third switching tube (S3) and a fourth switching tube (S4) in the port A circuit are all turned off, and the port A circuit works in a passive rectification mode through a body diode;
an eleventh switching tube (S11), a fourteenth switching tube (S14), a sixth switching tube (S6), a seventh switching tube (S7) and a tenth switching tube (S10) are synchronously conducted, and the conducting time is DT S ；
The twelfth switching tube (S12), the thirteenth switching tube (S13), the fifth switching tube (S5), the eighth switching tube (S8) and the ninth switching tube (S9) are synchronously conducted, and the conducting time is DT S ；
When D is more than 0.5, a first switching tube (S1), a second switching tube (S2), a third switching tube (S3) and a fourth switching tube (S4) in the port A circuit work in a PWM mode, and the conducting duty ratio is 1-D;
the first switching tube (S1) and the fourth switching tube (S4) are synchronously conducted;
the second switching tube (S2) and the third switching tube (S3) are synchronously conducted;
the conducting phase of the second switching tube (S2) is 180 degrees different from that of the first switching tube (S1);
the conducting phase of the first switching tube (S1) leads the fifth switching tube (S5) by 0-150 degrees;
complementary conduction of the thirteenth switching tube (S13) and the eleventh switching tube (S11);
complementary conduction of the fourteenth switching tube (S14) and the twelfth switching tube (S12);
the eleventh switching tube (S11) and the twelfth switching tube (S12) are 180 ° out of phase.
10. The method for reverse pre-charge control of a vehicle-mounted three-port DC converter according to claim 9, wherein,
the on duty ratio D of an eleventh switching tube (S11) and a twelfth switching tube (S12) of the C-port circuit is determined by a C-port current control loop and a B-port voltage control loop;
the voltage of the B port reaches the target voltage of the B port, and the second switch (K2) is turned on.
11. The method for reverse pre-charge control of a vehicle-mounted three-port DC converter according to claim 9, wherein,
the angle of the fifth switching tube (S5) with the leading or lagging conducting phase of the second switching tube (S2) and the first switching tube (S1) is determined by the port A voltage control loop;
when the voltage of the A port reaches the A port target voltage, the first switch (K1) is turned on.
12. The method for reverse pre-charge control of a vehicular three-port DC converter as defined in claim 8, wherein,
operating a vehicle-mounted three-port DC converter in a precharge mode 2 to implement a Battery (BAT) LV ) When energy is transferred to the B port only:
opening the second switch (K2);
in the C-port circuit, an eleventh switching tube (S11) and a twelfth switching tube (S12) are complementarily conducted, and the conducting time is DT S The duty ratio is D;
the thirteenth switching tube (S13) is complementarily conducted with the fourteenth switching tube (S14);
when the thirteenth switching tube (S13) is on, the eleventh switching tube (S11) is off and the twelfth switching tube (S12) is on;
when the fourteenth switching tube (S14) is turned on, the eleventh switching tube (S11) is turned on and the twelfth switching tube (S12) is turned off;
when the thirteenth switching tube (S13) is on, the eleventh switching tube (S11) is off and the twelfth switching tube (S12) is on;
when the fourteenth switching tube (S14) is turned on, the eleventh switching tube (S11) is turned on and the twelfth switching tube (S12) is turned off;
with the gradual rise of the voltage between the two ends of the B port connected with the high-voltage battery, the on duty ratio D of the eleventh switching tube (S11) and the twelfth switching tube (S12) is gradually increased from 0;
in the port B circuit, a fifth switching tube (S5), a sixth switching tube (S6), a seventh switching tube (S7), an eighth switching tube (S8), a ninth switching tube (S9) and a tenth switching tube (S10) are all turned off;
in the A-port circuit, a first switching tube (S1) and a third switching tube (S3) are kept off, and a second switching tube (S2) and a fourth switching tube (S4) are kept off and kept on.
13. The method for reverse pre-charge control of a vehicle-mounted three-port DC converter according to claim 12, wherein,
when the voltage of the B port reaches the B port target voltage, the second switch (K2) is turned on.
14. The method for reverse pre-charge control of a vehicular three-port DC converter as defined in claim 8, wherein,
the positive end of the first diode D1 is connected with the synonym end of the second winding (n 5) at the C port side, and the negative end is connected with the working low-voltage negative end (LV-);
the positive end of the second diode D2 is connected with the same-name end of the first winding (n 4) at the C port side, and the negative end of the second diode D2 is connected with the working low-voltage negative end (LV-) through the second clamping capacitor (C2).
15. The method for reverse pre-charge control of a vehicular three-port DC converter as defined in claim 8, wherein,
the eleventh switching tube (S11), the twelfth switching tube (S12), the thirteenth switching tube (S13) and the fourteenth switching tube (S14) are all insulated gate enhanced NMOS tubes;
the source end of the eleventh switching tube (S11), the source end of the twelfth switching tube (S12), the drain end of the thirteenth switching tube (S13) and the drain end of the fourteenth switching tube (S14) are all connected with a working low-voltage negative terminal (LV-).
16. The method for reverse pre-charge control of a vehicular three-port DC converter as defined in claim 8, wherein,
the C-port circuit further comprises a filter capacitor (Co);
and two ends of the filter capacitor (Co) are respectively connected with a working low-voltage positive end (LV+) and a working low-voltage negative end (LV-).
17. The method for reverse pre-charge control of a vehicular three-port DC converter as defined in claim 8, wherein,
the A port circuit further comprises a resonant inductor (Lr), a resonant capacitor (Cr) and an excitation inductor (Lm);
two ends of the resonant inductor (Lr) are respectively connected with the midpoint of the first bridge arm and the homonymous end of the A-port side winding (n 1);
two ends of the resonance capacitor (Cr) are respectively connected with the midpoint of the second bridge arm and the synonym end of the A port side winding (n 1);
two ends of the excitation inductor (Lm) are respectively connected with the midpoint of the second bridge arm and two ends of the A-port side winding (n 1).
18. The method for reverse pre-charge control of a vehicular three-port DC converter as defined in claim 8, wherein,
the B-port circuit further comprises a leakage inductance (Ls);
and two ends of the leakage inductance (Ls) are respectively connected with a midpoint of the fifth bridge arm and a heteronym end of the second B port side winding (n 3).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211723533.3A CN116207992A (en) | 2022-12-30 | 2022-12-30 | Reverse pre-charging control method for vehicle-mounted three-port direct current converter |
| PCT/CN2023/138310 WO2024140193A1 (en) | 2022-12-30 | 2023-12-13 | Reverse pre-charging control method for vehicle-mounted three-port direct-current converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211723533.3A CN116207992A (en) | 2022-12-30 | 2022-12-30 | Reverse pre-charging control method for vehicle-mounted three-port direct current converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116207992A true CN116207992A (en) | 2023-06-02 |
Family
ID=86513888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211723533.3A Pending CN116207992A (en) | 2022-12-30 | 2022-12-30 | Reverse pre-charging control method for vehicle-mounted three-port direct current converter |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN116207992A (en) |
| WO (1) | WO2024140193A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024140193A1 (en) * | 2022-12-30 | 2024-07-04 | 联合汽车电子有限公司 | Reverse pre-charging control method for vehicle-mounted three-port direct-current converter |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7180759B2 (en) * | 2004-11-03 | 2007-02-20 | Square D Company | Push-pull inverter with snubber energy recovery |
| WO2014160488A1 (en) * | 2013-03-13 | 2014-10-02 | Ideal Power, Inc. | Methods, systems, and devices for improved electric vehicle charging |
| CN111376760A (en) * | 2020-05-06 | 2020-07-07 | 深圳威迈斯新能源股份有限公司 | Three-port vehicle-mounted charger capable of reversely pre-charging |
| US11594973B2 (en) * | 2020-08-04 | 2023-02-28 | Delta Electronics Inc. | Multiple-port bidirectional converter and control method thereof |
| CN112421961A (en) * | 2020-10-30 | 2021-02-26 | 杭州富特科技股份有限公司 | Vehicle-mounted DC/DC converter with reverse pre-charging function and vehicle-mounted charging device |
| CN113556042B (en) * | 2021-07-22 | 2023-04-11 | 深圳威迈斯新能源股份有限公司 | Reverse pre-charging circuit and control method thereof, and vehicle-mounted three-port charger and control method thereof |
| CN116207992A (en) * | 2022-12-30 | 2023-06-02 | 联合汽车电子有限公司 | Reverse pre-charging control method for vehicle-mounted three-port direct current converter |
-
2022
- 2022-12-30 CN CN202211723533.3A patent/CN116207992A/en active Pending
-
2023
- 2023-12-13 WO PCT/CN2023/138310 patent/WO2024140193A1/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024140193A1 (en) * | 2022-12-30 | 2024-07-04 | 联合汽车电子有限公司 | Reverse pre-charging control method for vehicle-mounted three-port direct-current converter |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024140193A1 (en) | 2024-07-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109560711B (en) | Isolated bidirectional DC-DC converter and modulation method thereof | |
| CN111347900B (en) | Vehicle, motor control circuit and power battery charging and heating method | |
| CN111355398B (en) | Bidirectional vehicle-mounted charger circuit integrated with DC/DC converter | |
| CN109130903B (en) | Low-voltage high-power wireless charging system with bilateral LCCL-T topology | |
| Park et al. | Design and control of a bidirectional resonant dc–dc converter for automotive engine/battery hybrid power generators | |
| CN109510453A (en) | A kind of EV onboard charger based on SiC power device | |
| JP5563577B2 (en) | Bidirectional inverter / charger and inverter / charger device | |
| CN104811047B (en) | Two-way DC/DC converter and its control method | |
| CN111463878A (en) | Compatible high-power double-end output vehicle-mounted charger and control method thereof | |
| WO2011084742A2 (en) | Bidirectional signal conversion | |
| CN101997323A (en) | Charging system with galvanic isolation and multiple operating modes | |
| CN111464040B (en) | DCDC framework applicable to different input power grids and control method thereof | |
| CN102810891B (en) | For the system and method for initialization charging system | |
| WO2024140193A1 (en) | Reverse pre-charging control method for vehicle-mounted three-port direct-current converter | |
| CN111245078A (en) | Bidirectional vehicle-mounted charger circuit integrated with DC/DC converter | |
| Kougioulis et al. | An isolated multiport DC–DC converter for integrated electric vehicle on-board charger | |
| US12034375B2 (en) | Vehicle DC voltage conversion circuit | |
| CN206402101U (en) | PFC circuit and charger | |
| Chiang et al. | Coupled magnetic-based integrated isolated onboard battery charger and boost motor drive unit for electric vehicles | |
| Indalkar et al. | An off board electric vehicle charger based on zvs interleaved ac-dc boost pfc converter | |
| WO2024140190A1 (en) | On-board three-port converter control method | |
| CN112956099A (en) | Method and apparatus for voltage adaptation of a rectifier transformer of a DC-DC converter before connection of a high voltage battery | |
| CN109103974A (en) | A kind of driving of electric car and battery charge integrated topology | |
| CN113783477B (en) | Multi-working-mode motor driving system for electric automobile | |
| CN116191889A (en) | Vehicle-mounted three-port converter and control method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |