CN113949282A - Three-port vehicle-mounted charger - Google Patents
Three-port vehicle-mounted charger Download PDFInfo
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- CN113949282A CN113949282A CN202111226503.7A CN202111226503A CN113949282A CN 113949282 A CN113949282 A CN 113949282A CN 202111226503 A CN202111226503 A CN 202111226503A CN 113949282 A CN113949282 A CN 113949282A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33561—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 more than one ouput with independent control
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
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- 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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a three-port vehicle-mounted charger, which comprises a primary side converter connected with a primary side winding of a transformer, a secondary side first converter connected with a secondary side winding of the transformer, a secondary side second converter connected with a third winding of the transformer, and a central controller for controlling the switches of the primary side converter and the secondary side first and second converter, wherein the secondary side second converter comprises a current-multiplying rectification circuit, the primary side converter is connected with an external power supply, the secondary side first converter is connected with a high-voltage battery, and the secondary side second converter is connected with a low-voltage battery; the vehicle-mounted charger can control and switch four working modes: a charging mode, a reverse power supply mode, a travel mode and a precharge mode. The vehicle-mounted charger and the vehicle-mounted DCDC converter are electrically integrated through the three-port transformer, and the switching of different working modes is realized through control, so that the number of power devices is reduced, the size of the device is reduced, and the cost is reduced.
Description
Technical Field
The invention belongs to the technical field of electricians, power electronics, new energy power generation and direct current conversion, relates to three-port vehicle-mounted charging equipment, and particularly relates to a three-port power integrated converter capable of realizing four charging modes.
Background
At present, people attach great importance to the environment and the clean and renewable energy, so that a fuel automobile is possibly replaced in the future, an electric automobile starts to run, an engine and an oil tank are replaced by a motor and a battery, and an OBC (on-board charger) is added to charge the battery, however, the traditional on-board charger of the electric automobile and the on-board DC/DC converter are both independent modules, work independently, the cost is high, the volume and the weight of an on-board power conversion part are large, and a large amount of space is occupied. Therefore, an integration scheme for a vehicle-mounted charger and a vehicle-mounted DC/DC converter becomes an important research direction nowadays.
Disclosure of Invention
The invention aims to provide a three-port vehicle-mounted charger aiming at the defects of the prior art, the charger is a scheme which can enable the vehicle-mounted charger and a vehicle-mounted DC/DC direct current converter to realize power integration, the DC/DC is shared with a high-voltage device of the vehicle-mounted charger, the size is reduced, the cost is reduced, bidirectional voltage boosting and reducing can be realized among three ports, the number of magnetic components is small, a current-doubling rectification structure is adopted on a low-voltage side, the three-port vehicle-mounted charger is suitable for the condition of low voltage and large current, the number of magnetic components is less than that of bridge rectifier switching devices, and a transformer does not need a center tap and is simpler than that of full-wave rectification.
The three-port vehicle-mounted charger comprises a primary side converter connected with a primary winding of a transformer, a secondary side first converter connected with a secondary winding of the transformer, a secondary side second converter connected with a third winding of the transformer, and a central controller for controlling switching tubes in the primary side converter, the secondary side first converter and the secondary side second converter, wherein the primary side converter is connected with an external power supply, the secondary side first converter is connected with a high-voltage battery, the secondary side second converter is connected with a low-voltage battery, and the secondary side second converter further comprises a current doubling rectifying circuit. The charger is provided with four working modes, namely a charging mode, an inversion mode (namely a reverse power supply mode), a running mode and a pre-charging mode, wherein in the charging mode, the on-off frequency of a switch in an external power supply side circuit is controlled, the winding voltage is adjusted, a high-voltage side circuit is controlled to work in a rectification mode, the high-voltage side battery is charged, a low-voltage battery side circuit is controlled to work in a current-doubling rectification mode, and the low-voltage output is adjusted by controlling the duty ratio of a bidirectional switch; in the inversion mode, a circuit where the high-voltage side battery is located and a circuit switch where an external power supply is located are controlled to fix a phase angle, winding voltage is adjusted by controlling on-off frequency of the switch, meanwhile, a circuit on the low-voltage side battery is controlled to work in a current-doubling rectification mode, and low-voltage output is adjusted by controlling duty ratio of a bidirectional switch; in a running mode, the on-off frequency of a circuit switch where the high-voltage battery is located is adjusted, the winding voltage is adjusted, the bidirectional switch is normally opened, and the circuit where the low-voltage battery is located is controlled to work in a current-doubling rectifying mode; in the pre-charging mode, the bidirectional switch is normally opened, the voltage of the winding is adjusted by adjusting the duty ratio of the switch, and the circuit where the high-voltage battery is located works in the rectification mode to pre-charge the high-voltage battery.
Specifically, the primary side converter comprises a first filter capacitor, switches from one to four, a first capacitor and a first inductor; the first switch, the second switch are sequentially connected in series through a source electrode and a drain electrode and then connected with the external power supply, the third switch and the fourth switch are sequentially connected in series through a source electrode and a drain electrode and then connected with the external power supply, the first filter capacitor is connected with the external power supply, the first capacitor, the first inductor and the primary winding of the transformer are connected in series between the connecting line of the first switch, the second switch and the connecting line of the third switch, and the first switch, the second switch and the fourth switch are respectively connected with the central controller.
The secondary side first converter comprises a second filter capacitor, five to eight switches, a second capacitor and a second inductor; the eight switch is connected with the high-voltage battery through a source electrode and a drain electrode which are sequentially connected in series, the six switch is connected with the high-voltage battery through a source electrode and a drain electrode which are sequentially connected in series, the second capacitor, the second inductor and the secondary winding of the transformer are connected in series between the connecting line of the eight switch and the connecting line of the six switch, and the five to eight switches are respectively connected with the central controller.
The secondary side second converter comprises a bidirectional switch, a switch nine, a switch ten, a third inductor, a fourth inductor and a third filter capacitor; the transformer third winding is connected in series, one end of a switch nine source electrode is connected with the switch ten drain electrode in series and connected with the third inductor and the bidirectional switch, the other end of the switch nine source electrode is connected with the fourth inductor and the transformer third winding, one end of a third filter capacitor is connected with the third inductor and the fourth inductor after being connected with the low-voltage battery in parallel, the other end of the third filter capacitor is connected with a connecting wire of the switch nine and the switch ten, and the bidirectional switch, the switch nine and the switch ten are respectively connected with the central controller.
And in the charging mode, the first switch and the fourth switch are synchronous, the second switch and the third switch are synchronous, and are alternatively switched on and off with the first switch and the fourth switch, the circuit on the high-voltage battery side works in a rectification mode, the bidirectional switch of the circuit on the low-voltage battery side is switched on and off at selected time during the switching on period of the first switch and the fourth switch, and the output voltage on the low-voltage side is changed by controlling the duty ratio of the bidirectional switch.
In the inversion mode, the six and seven switches are synchronous, the five and eight switches are synchronous and are alternatively switched on and off with the six and seven switches, the first and fourth switches are controlled to be switched on when the six and seven switches are switched on, the switch of the circuit where the external power supply is located and the switch of the circuit where the high-voltage battery side is located fix a phase angle, the output gain is changed by changing the working frequency, the two-way switch of the circuit where the low-voltage battery side is located is switched on and off when the six and seven switches are switched on, and the output voltage of the low-voltage side is changed by controlling the duty ratio of the two-way switch, wherein the working mode of frequency modulation and phasing is set to enable the external power supply side to work in a non-resistive area, and a part of reactive power generated by frequency modulation control is compensated, so that the efficiency, the realization of the primary ZVS and the increase of the voltage regulation range are realized.
And in the running mode, the six and seven switches are synchronous, the five and eight switches are synchronous and are alternately switched on and off with the six and seven switches, the bidirectional switch of the circuit on the low-voltage battery side is switched on and off at selected time during the switching on of the six and seven switches, and the output voltage on the low-voltage side is changed by controlling the duty ratio of the bidirectional switch.
And in the pre-charging mode, the bidirectional switch is switched on, the high-voltage side filter capacitor is pre-charged by controlling duty ratios of nine and ten switches, and the circuit where the high-voltage side battery is located works in a rectification mode.
Compared with the prior art, the invention integrates the charger with the high-power DCDC module, can realize four working modes, shares the power switch, the control circuit and the magnetic core, can flexibly realize the charging mode, the inversion mode, the driving mode and the pre-charging mode, has simple structure, small volume and light weight, can realize soft switching, and can be widely applied to vehicle-mounted chargers.
Drawings
FIG. 1 is a circuit diagram of an embodiment;
FIG. 2 shows the operation of the charge mode switch tube and the current flow direction;
FIG. 3 is a waveform diagram of the switch in the charging mode;
FIG. 4 shows the operation of the switch tube and the current flow direction in the inversion mode;
FIG. 5 is a waveform diagram of the switch in the inversion mode;
FIG. 6 is an equivalent circuit diagram of the inverter mode;
FIG. 7 is a graph of high side current phase angle versus port phase shift angle;
FIG. 8 shows the operation of the switch tube and the current flow direction in the driving mode;
FIG. 9 is a waveform diagram of the switch in the driving mode;
FIG. 10 shows the operation of the switch tube and the current flow in the pre-charge mode;
fig. 11 is a waveform diagram of switching in the precharge mode.
Detailed Description
In order to make the technical scheme and advantages of the present invention clearer, the present invention is further described below with reference to the accompanying drawings and embodiments. The examples herein are merely illustrative of the present invention and are not intended to be limiting thereof.
Referring to fig. 1, the three-port vehicle-mounted charger of the invention comprises a primary side converter connected with a transformer winding W1, a secondary side first converter connected with a transformer second winding W2, and a secondary side second converter connected with a transformer third winding W3, wherein the secondary side second converter comprises a current-doubling rectifying circuit, and a central controller for controlling the switches of the primary side converter and the secondary side first converter, wherein the primary side converter is connected with an external power supply such as a power grid, the secondary side first converter is connected with a high-voltage battery, and the secondary side second converter is connected with a low-voltage battery. The high-voltage battery has higher voltage, more energy storage and higher power, and the low-voltage battery has lower voltage, lower power and higher current.
The invention can be widely applied to a vehicle-mounted charger, and the charger can be integrated with a high-power DCDC module.
The central controller is provided with a charging mode, an inversion mode, a driving mode and a pre-charging mode.
In the example of fig. 1, in particular, the primary converter comprises a first filter capacitor C1Switch one to switch four Q1-Q4A first capacitor Cr1First inductance Lr1(ii) a Switch one Q1Source and switch two Q2The drain electrodes are connected in series and then connected with the external power supply and the switch three Q3Source and switch quad Q4The drain electrodes are connected in series and then connected with the external power supply and the first filter capacitor C1A first capacitor C connected to the external power supplyr1First inductance Lr1Is connected with a primary winding W1 of the transformer in series at the first switch Q1Switch two Q2Connecting line and switch three Q3Switch four Q4Between the connecting lines; the secondary side first converter comprises a second filter capacitor C2Five switches to eight switches Q5-Q8A second capacitor Cr2Second inductance Lr2(ii) a Seven Q switch7Eight Q source and switch8The drain electrodes are connected in series and then connected with the high-voltage battery and the switch five Q5Source and switch six Q6The drain electrodes are connected in series and then connected with the high-voltage battery and the second filter capacitor C2A second capacitor C connected in parallel with the high-voltage batteryr2Second inductance Lr2And a second winding W2 of the transformer are connected in series with the switch seven Q7Switch eight Q8Connecting wire and switch five Q5Switch six Q6Between the connecting lines; the secondary side second converter comprises two-way switches Qa and Qb, a switch nine and a switch ten Q9-Q10Third inductance L3Fourth inductance L4A third filter capacitor C3(ii) a The bidirectional switches Qa and Qb are connected in series with the third winding W3 of the transformer, and the switch is nine Q9Source and switch decaq10One end of the drain electrode is connected with the third inductor L after being connected in series3A bidirectional switch Qa, Qb, and a fourth inductor L4A third winding W3 of the transformer, and a third filter capacitor C3One end of the low-voltage battery is connected with the third inductor L in parallel3A fourth inductor L4Connected with the other end of the switch nine Q9And switch decaq10The connecting wires are connected; wherein all switches are controlled by a central controller.
In the charging mode, the central controller controls the first switch to be in four-synchronization and the second switch to be in three-synchronization, and the first switch and the second switch are alternately switched on and off, the circuit on the high-voltage battery side works in the rectification mode, during the first switch and the fourth switch, the bidirectional switches Qa and Qb of the circuit on the low-voltage battery side are switched on and off selectively, and the duty ratio of the Qa and Qb is controlled to change the output voltage on the low-voltage side. As shown in fig. 2 and 3.
As shown in fig. 4-7, in the inversion mode, the switch sixty-seven is synchronous, the switch fifty-eight is synchronous, and is alternatively turned on and off with the switch sixty-seven, and during the period that the switch sixty-seven is turned on, the switch one is controlledWhen the four-time selection is conducted, the switch of the circuit where the external power supply is located and the switch of the circuit where the high-voltage battery side is located fix phase angles, output gain is changed by changing working frequency, an equivalent mathematical model is established aiming at the high-voltage side and the external power supply side, and the current expression formula I of the external power supply side is obtained1During the sixteenth conduction period, the bidirectional switches Qa and Qb of the circuit on the low-voltage battery side are selectively turned on and off, and the output voltage on the low-voltage side is changed by controlling the duty ratio of Qa and Qb.
Wherein the parameters are defined as follows:
n is the ratio of the high-voltage battery side winding to the external power supply side winding
X2: high side resonant cavity impedance
X1: external power source side resonant cavity impedance
α: external power supply side voltage lead angle
w: angular frequency
Wherein w is 2 pi f
f: frequency of operation
UH: high voltage battery voltage
UG: voltage of external power supply
Lm: excitation inductance
I1: resonant cavity current at external power supply side
Simultaneously and according to the expression I of the external power supply1Solving a high-voltage side current expression I2。
Wherein I2: the high-voltage side resonant cavity current is supposed to output 4kW power reversely, and the output voltage is always kept at 400Vdc, namely the effective value U of the alternating voltageG＝360VrmsThen the output power Po ═ I | I1|*|UG|*cos(α-angle(I1))＝4000 a can be used to derive the relationship between a and f. However, if ZVS is guaranteed, the high-side current I2Phase angle theta<And 0, simultaneously, the relation between theta and alpha can be made according to different input voltages, the intersection selected by phase angles under different input voltages is obtained, and meanwhile, in order to consider that the reactive power in the whole input voltage range is as small as possible, the position of theta close to 0 is selected as far as possible.
Wherein theta is I2Phase angle
As shown in fig. 8 and 9, in the driving mode, the switches sixty-seven are synchronized, the switches fifty-eight are synchronized, and are alternately turned on and off with the switches sixty-seven, and during the period that the switches sixty-seven are turned on, the bidirectional switches Qa and Qb of the circuit on the low-voltage battery side are selectively turned on and off, and the output voltage on the low-voltage side is changed by controlling the duty ratios of the switches Qa and Qb.
In the precharge mode, the bidirectional switches Qa and Qb are turned on, and the high-voltage side capacitor C2 is precharged by the duty ratio of the control switch ninety, so that the circuit in which the high-voltage side battery is located operates in the rectifying mode. As shown in fig. 10 and 11.
Claims (9)
1. The utility model provides a three-port vehicle carries machine that charges which characterized in that: comprising a primary winding (W) connected to a transformer1) The transformer comprises a primary side converter, a secondary side first converter connected with a second winding (W2) of the transformer, a secondary side second converter connected with a third winding (W3) of the transformer, and a central controller for controlling switching tubes in the primary side converter, the secondary side first converter and the secondary side second converter, wherein the primary side converter is connected with an external power supply, the secondary side first converter is connected with a high-voltage battery, the secondary side second converter is connected with a low-voltage battery, and the secondary side second converter further comprises a current doubling rectifying circuit.
2. The three-port vehicle-mounted charger according to claim 1, characterized in that: the secondary side second converter is provided with a bidirectional switch, and the charger has four working modes: a charging Mode (Charge Mode), a Reverse power supply Mode (Reverse Mode), a driving Mode (Drive Mode), and a Pre-charging Mode (Pre-Charge Mode);
in the charging mode, the primary side converter works in an inverter mode, and the output power is regulated by controlling the switching frequency of the primary side converter; controlling a secondary side first converter to work in a rectification mode and charge the high-voltage battery; meanwhile, the secondary side second converter is controlled to work in a current-doubling rectification mode, and the charging power from an external power supply to the low-voltage battery is controlled by adjusting the duty ratio of the bidirectional switch; when the low-voltage battery is fully charged, the bidirectional switch is turned off;
in a reverse power supply mode, the secondary side first converter and the primary side converter work in an active full-bridge mode, the phase angle of voltage between the middle points of the bridge arms of the secondary side first converter and the primary side converter is fixed, the switching frequencies are consistent, and the high-voltage battery supplies power to the primary side by controlling the switching frequencies; meanwhile, the duty ratio of a bidirectional switch in the secondary side second converter is adjusted to control the charging power from the high-voltage battery to the low-voltage battery; when the low-voltage battery is fully charged, the bidirectional switch is turned off;
when the vehicle runs in a running mode, the working frequency of the secondary side first converter is controlled, the secondary side high-voltage battery is inverted into alternating current, the secondary side second converter is controlled to work in a current-doubling rectifying mode to supply power to the low-voltage battery, and when the low-voltage battery is fully charged, the bidirectional switch is turned off;
in the pre-charging mode, the bidirectional switch is turned on to control the switching duty ratio in the secondary side second converter, the high-voltage battery is pre-charged for a short time, and the secondary side first converter works in a rectification mode.
3. The three-port vehicle-mounted charger according to claim 2, characterized in that: the primary side converter comprises a first filter capacitor (C)1) Switch one to switch four (Q)1-Q4) A first capacitor (C)r1) First inductance (L)r1) (ii) a Switch one (Q)1) Source and switch two (Q)2) The drain electrodes are connected in series and then connected with the external power supply and a switch III (Q)3) Source and switch four (Q)4) The drain electrodes are connected in series to the external power supply, the first filter capacitor (C)1) Connected to the external power supply, a first capacitor (C)r1) First inductance (L)r1) Is connected with the primary winding (W1) of the transformer in series at the first switch (Q)1) Switch two (Q)2) Connecting line and switch III(Q3) Switch four (Q)4) Between the connecting lines of (1), switch one to switch four (Q)1-Q4) Are respectively connected with the central controller.
4. The three-port vehicle-mounted charger according to claim 3, characterized in that: the secondary side first converter comprises a second filter capacitor (C)2) Five switches to eight switches (Q)5-Q8) A second capacitor (C)r2) Second inductance (L)r2) (ii) a Switch seven (Q)7) Source and switch eight (Q)8) The drain electrodes are connected in series and then connected with the high-voltage battery and a switch five (Q)5) Source and switch six (Q)6) The drain electrodes are connected in series and then connected with the high-voltage battery and the second filter capacitor (C)2) A second capacitor (C) connected in parallel with the high-voltage batteryr2) Second inductance (L)r2) And a second winding (W2) of the transformer are connected in series with the switch seven (Q)7) Switch eight (Q)8) Connecting line and switch five (Q)5) Switch six (Q)6) Between the connecting lines of (1), switch five to switch eight (Q)5-Q8) Are respectively connected with the central controller.
5. The three-port vehicle-mounted charger according to claim 4, characterized in that: the secondary side second converter comprises bidirectional switches (Qa, Qb), a switch nine and a switch ten (Q)9-Q10) Third inductance (L)3) Fourth inductance (L)4) Third filter capacitor (C)3) (ii) a The bidirectional switches (Qa, Qb) and the third winding (W3) of the transformer are connected in series to form a series branch, and the switch nine (Q)9) Source and switch ten (Q)10) One end of the drain electrode is connected with the third inductor (L) after being connected in series3) One end of the series branch is connected with the other end of the series branch and the other end of the series branch is connected with a fourth inductor (L)4) The other end of the series branch is connected with a third filter capacitor (C)3) One end of the low-voltage battery is connected with a third inductor (L) in parallel3) A fourth inductor (L)4) Connected with the other end of the switch nine (Q)9) And switch ten (Q)10) Are connected with the connecting line, the bidirectional switches (Qa, Qb), the switch nine and the switch ten (Q)9-Q10) Are respectively provided withIs connected with the central controller.
6. The three-port vehicle-mounted charger according to claim 5, characterized in that: in the charging mode, the switch one (Q)1) Switch four (Q)4) Synchronization, the switch two (Q)2) Switch three (Q)3) Synchronous with switch one (Q)1) Switch four (Q)4) Alternately conducting and cutting off, the circuit on the high-voltage battery side works in a rectification mode and is on a switch I (Q)1) Switch four (Q)4) During the conduction period, the bidirectional switches (Qa, Qb) of the circuit at the low-voltage battery side are switched on and off at the selected time, and the output voltage at the low-voltage side is changed by controlling the duty ratio of the bidirectional switches (Qa, Qb).
7. The three-port vehicle-mounted charger according to claim 5, characterized in that: in the reverse power supply mode, the switch six (Q)6) Seven (Q) switch7) Synchronization, the switch five (Q)5) Switch eight (Q)8) In synchronism with, and having a sixth switch (Q)6) Seven (Q) switch7) Alternately turned on and off, at switch six (Q)6) Seven (Q) switch7) During the conduction period, the first (Q) switch is controlled1) Switch four (Q)4) When the switch is on, the switch of the circuit where the external power supply is located and the switch of the circuit where the high-voltage battery is located fix the phase angle, the output gain is changed by changing the working frequency, and the output gain is changed at a switch six (Q)6) Seven (Q) switch7) During the conduction period, the bidirectional switches (Qa, Qb) of the circuit at the low-voltage battery side are switched on and off at the selected time, and the output voltage at the low-voltage side is changed by controlling the duty ratio of the bidirectional switches (Qa, Qb).
8. The three-port vehicle-mounted charger according to claim 5, characterized in that: in the driving mode, the switch is switched to a sixth (Q)6) Seven (Q) switch7) Synchronization, the switch five (Q)5) Switch eight (Q)8) In synchronism with, and having a sixth switch (Q)6) Seven (Q) switch7) Alternately turned on and off, at switch six (Q)6) Opening, openingGuanqi (Q)7) During the conduction period, the bidirectional switches (Qa, Qb) of the circuit at the low-voltage battery side are switched on and off at the selected time, and the output voltage at the low-voltage side is changed by controlling the duty ratio of the bidirectional switches (Qa, Qb).
9. The three-port vehicle-mounted charger according to claim 5, characterized in that: in the pre-charging mode, the bidirectional switches (Qa, Qb) are turned on, and nine (Q) switches are controlled9) And switch ten (Q)10) Duty ratio of (C) to the second filter capacitance (C)2) And performing pre-charging, wherein the circuit where the high-voltage side battery is located works in a rectification mode.
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| CN202111226503.7A CN113949282A (en) | 2021-10-21 | 2021-10-21 | Three-port vehicle-mounted charger |
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| CN202111226503.7A CN113949282A (en) | 2021-10-21 | 2021-10-21 | Three-port vehicle-mounted charger |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114290927A (en) * | 2021-03-31 | 2022-04-08 | 华为数字能源技术有限公司 | Energy conversion device, power system and vehicle |
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