CN110277904B - Power factor correction circuit and vehicle-mounted charger - Google Patents
Power factor correction circuit and vehicle-mounted charger Download PDFInfo
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- CN110277904B CN110277904B CN201910514302.3A CN201910514302A CN110277904B CN 110277904 B CN110277904 B CN 110277904B CN 201910514302 A CN201910514302 A CN 201910514302A CN 110277904 B CN110277904 B CN 110277904B
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- 230000007935 neutral effect Effects 0.000 claims abstract description 24
- 238000006243 chemical reaction Methods 0.000 claims description 15
- 238000005070 sampling Methods 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 16
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Classifications
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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
- 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
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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
- 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
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- H02J2007/10—
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses a power factor correction circuit and a vehicle-mounted charger, wherein the power factor correction circuit comprises an input switching module, a three-phase bridge rectifier module, a main control module, a first capacitor and a second capacitor, when a single-phase alternating current power supply supplies power to the power factor correction circuit, the input switching module executes first line switching so that a live wire of the single-phase alternating current power supply is connected with a first input end and a second input end of the three-phase bridge rectifier module through the input switching module, and a neutral wire of the single-phase alternating current power supply is connected with a third input end of the three-phase bridge rectifier module and a midpoint of the capacitor through the input switching module; the three-phase bridge rectifier module rectifies a single-phase alternating current power supply and realizes power factor correction, and one bridge arm of the three-phase bridge rectifier module generates power frequency compensation current. The power frequency compensation current in the bridge arm can eliminate the power frequency ripple wave in the output current of the three-phase bridge rectifier module, so that the output capacitor with smaller capacity can be adopted, the volume can be effectively reduced, and the cost can be reduced.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a power factor correction circuit and a vehicle-mounted charger.
Background
The power factor correction (Power Factor Correction, PFC) circuit is an electronic circuit for improving the power factor of electric equipment in the field of power electronics, and along with the continuous development of power electronics technology, miniaturization, low cost and high efficiency become the continuous development direction of the circuit.
In the prior art, the PFC circuit topology compatible with single-phase alternating current and three-phase alternating current is shown in fig. 1, the PFC circuit topology is a three-bridge-arm PFC circuit, a relay is arranged at an alternating current input end, and switching between single-phase alternating current input and three-phase alternating current input is realized through the switching-off and the switching-on actions of the relay. When the three-bridge-arm PFC circuit works in a single-phase alternating current input mode, two bridge arms rectify the single-phase alternating current, power frequency ripple waves (50 Hz or 60Hz ripple waves) exist in output current, and in order to filter the power frequency ripple waves, an output end needs to be provided with an output capacitor with larger capacity, so that the three-bridge-arm PFC circuit is large in size and high in cost.
Disclosure of Invention
The invention provides a power factor correction circuit which is used for solving the problems of large volume and high cost of a three-bridge-arm PFC circuit caused by power frequency ripple in output current when the traditional three-bridge-arm PFC circuit works in a single-phase alternating current input mode.
The invention provides a power factor correction circuit, which comprises an input switching module, a three-phase bridge rectifier module, a main control module, a first capacitor and a second capacitor;
The first end of the first capacitor and the first end of the second capacitor are respectively connected with the first output end and the second output end of the three-phase bridge rectifier module, and the second end of the first capacitor and the second end of the second capacitor are connected together to form a capacitor midpoint;
when the main control module detects that a single-phase alternating current power supply supplies power to the power factor correction circuit, the main control module controls the input switching module to execute first line switching so that a live wire of the single-phase alternating current power supply is connected with a first input end and a second input end of the three-phase bridge rectifier module through the input switching module, and a neutral wire of the single-phase alternating current power supply is connected with a third input end of the three-phase bridge rectifier module and the midpoint of the capacitor through the input switching module; and the main control module controls the three-phase bridge rectifier module to rectify the single-phase alternating current power supply and realize power factor correction, and simultaneously controls a bridge arm correspondingly connected with a third input end of the three-phase bridge rectifier module to serve as an output current compensation bridge arm so as to generate power frequency compensation current, thereby eliminating power frequency ripple waves in the output current of the three-phase bridge rectifier module.
When the main control module detects that the three-phase alternating current power supply supplies power to the power factor correction circuit, the main control module controls the input switching module to execute second line switching so that a first phase line, a second phase line, a third phase line and a middle line of the three-phase alternating current power supply are respectively connected with a first input end, a second output end, a third input end and a middle point of the capacitor of the three-phase bridge rectifier module through the input switching module; and the main control module controls the three-phase bridge rectifier module to rectify the three-phase alternating current power supply and realize power factor correction.
The power factor correction circuit further comprises a current sampling module;
The current sampling module acquires an alternating current output current value of the single-phase alternating current power supply and a third current value flowing through a third input end of the three-phase bridge rectifier module, and outputs the alternating current output current value and the third current value to the main control module;
And the main control module generates a control signal of the output current compensation bridge arm according to the difference value of the alternating current output current value and the third current value so as to enable the output current compensation bridge arm to generate power frequency compensation current.
The input switching module is provided with a first input end, a second input end, a third input end, a fourth input end, a first output end, a second output end, a third output end and a fourth output end; the first output end, the second output end, the third output end and the fourth output end of the input switching module are respectively connected with the first input end, the second input end, the third input end and the midpoint of the capacitor of the three-phase bridge rectifier module;
When the main control module detects that a single-phase alternating current power supply supplies power to the power factor correction circuit, the main control module controls the input switching module to execute first circuit switching so that a second input end of the input switching module is connected with a first output end and a second output end of the input switching module, the first input end of the input switching module is suspended, and the second input end of the input switching module is connected to a live wire of the single-phase alternating current power supply; or the first input end, the second input end, the first output end and the second output end of the input switching module are connected together, and the first input end and the second input end of the input switching module are respectively connected with a live wire of a single-phase alternating current power supply; and suspending the third input end of the input switching module, wherein the fourth input end of the input switching module is connected with the third output end and the fourth output end of the input switching module, and the fourth input end of the input switching module is connected to the central line of the single-phase alternating current power supply.
When the main control module detects that the three-phase alternating current power supply supplies power to the power factor correction circuit, the main control module controls the input switching module to execute second circuit switching, so that a first input end, a second input end, a third input end and a fourth input end of the input switching module are respectively connected with a first output end, a second output end, a third output end and a fourth output end of the input switching module, and the first input end, the second input end, the third input end and the fourth input end of the input switching module are respectively connected with a first phase line, a second phase line, a third phase line and a neutral line of the three-phase alternating current power supply.
The three-phase bridge rectifier module comprises a first inductor, a second inductor, a third inductor, a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube and a sixth switching tube;
The first end of the first inductor, the first end of the second inductor and the first end of the third inductor are respectively a first input end, a second input end and a third input end of the three-phase bridge rectifier module; the first end of the first switching tube, the first end of the third switching tube and the first end of the fifth switching tube are connected together to form a first output end of the three-phase bridge rectifier module, and the first end of the second switching tube, the first end of the fourth switching tube and the first end of the sixth switching tube are connected together to form a second output end of the three-phase bridge rectifier module; the second end of the first switching tube and the second end of the second switching tube are connected with the second end of the first inductor, the second end of the third switching tube and the second end of the fourth switching tube are connected with the second end of the second inductor, and the second end of the fifth switching tube and the second end of the sixth switching tube are connected with the second end of the third inductor.
The input switching module comprises a first switch, a second switch, a third switch, a fourth switch and a fifth switch;
The first connecting end of the first switch, the first connecting end of the second switch and the first connecting end of the third switch are respectively a first input end, a second input end and a third input end of the input switching module; the second connection end of the first switch, the second connection end of the second switch and the second connection end of the third switch are respectively a first output end, a second output end and a third output end of the input switching module; the first connecting end and the second connecting end of the fourth switch are respectively connected with the second connecting end of the first switch and the first connecting end of the second switch; the first connecting end of the fifth switch is connected with the second connecting end of the third switch, and the second connecting end of the fifth switch is a fourth input end and a fourth output end of the input switching module;
When the main control module detects that a single-phase alternating current power supply supplies power to the power factor correction circuit, the main control module controls the fourth switch, the second switch and the fifth switch to be closed, and simultaneously controls the first switch and the third switch to be opened;
when the main control module detects that the three-phase alternating current power supply supplies power to the power factor correction circuit, the main control module controls the first switch, the second switch and the third switch to be closed, and simultaneously controls the fourth switch and the fifth switch to be opened.
The input switching module comprises a sixth switch, a seventh switch, an eighth switch, a ninth switch and a tenth switch;
The first connection end of the sixth switch, the first connection end of the seventh switch and the first connection end of the eighth switch are respectively a first input end, a second input end and a third input end of the input switching module; the second connection end of the sixth switch, the second connection end of the seventh switch and the second connection end of the eighth switch are respectively a first output end, a second output end and a third output end of the input switching module; the first connecting end and the second connecting end of the ninth switch are respectively connected with the first connecting end of the sixth switch and the first connecting end of the seventh switch; the first connecting end of the tenth switch is connected with the second connecting end of the eighth switch, and the second connecting end of the tenth switch is a fourth input end and a fourth output end of the input switching module;
When the main control module detects that a single-phase alternating current power supply supplies power to the power factor correction circuit, the main control module controls the sixth switch, the seventh switch, the ninth switch and the tenth switch to be closed, and simultaneously controls the eighth switch to be opened;
When the main control module detects that the three-phase alternating current power supply supplies power for the power factor correction circuit, the main control module controls the sixth switch, the seventh switch and the eighth switch to be closed, and simultaneously controls the ninth switch and the tenth switch to be opened.
The invention also provides a vehicle-mounted charger which comprises the power factor correction circuit and a DC-DC conversion circuit;
the first output end and the second output end of the three-phase bridge rectifier module in the power factor correction circuit are respectively connected with the first input end and the second input end of the DC-DC conversion circuit, and the output end of the DC-DC conversion circuit is connected with the vehicle-mounted high-voltage battery.
The DC-DC conversion circuit is an LLC resonant circuit.
When the power factor correction circuit provided by the invention is powered by a single-phase alternating current power supply, the first input end and the second input end of the three-phase bridge rectifier module are commonly connected to a live wire of the single-phase alternating current power supply, the third input end of the three-phase bridge rectifier module and the midpoint of the capacitor are commonly connected to the central line of the single-phase alternating current power supply, the three-phase bridge rectifier module rectifies the single-phase alternating current power supply, and meanwhile, the third input end of the three-phase bridge rectifier module is correspondingly connected with a bridge arm to generate power frequency compensation current, and the power frequency compensation current can eliminate power frequency ripple waves in the output current of the three-phase bridge rectifier module. Therefore, the required capacity of the output capacitor is reduced, the capacitor volume is reduced, and the cost is reduced, so that the volume of the power factor correction circuit is reduced, and the cost is reduced.
Drawings
Fig. 1 is a PFC circuit topology compatible with single-phase and three-phase ac inputs provided in the background;
Fig. 2 is a schematic diagram of a power factor correction circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a PFC circuit according to another embodiment of the present invention;
FIG. 4 is a schematic diagram of a PFC circuit according to another embodiment of the present invention;
FIG. 5 is a control block diagram of an output current compensation bridge arm in a three-phase bridge rectifier module according to the present invention;
FIG. 6 is a schematic diagram of a PFC circuit according to another embodiment of the present invention;
Fig. 7 is a schematic diagram of a power factor correction circuit according to another embodiment of the present invention;
FIG. 8 is a power factor correction circuit diagram according to an embodiment of the present invention;
FIG. 9 is a power factor correction circuit diagram according to another embodiment of the present invention;
FIG. 10 is a power factor correction circuit diagram according to another embodiment of the present invention;
FIG. 11 is a power factor correction circuit diagram according to another embodiment of the present invention;
fig. 12 is a schematic circuit diagram of a vehicle-mounted charger according to an embodiment of the present invention;
FIG. 13 is a waveform diagram of an AC output current and a third current according to an embodiment of the present invention;
Fig. 14 is a waveform diagram of output currents of the first bridge arm and the second bridge arm and currents in the fifth switching tube according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Fig. 2 is a schematic diagram of a power factor correction circuit 100 according to an embodiment of the invention, where the power factor correction circuit 100 includes an input switching module 101, a three-phase bridge rectifier module 102, a main control module 103, a first capacitor C1 and a second capacitor C2.
The first end of the first capacitor C1 and the first end of the second capacitor C2 are respectively connected with the first output end and the second output end of the three-phase bridge rectifier module 102, and the second end of the first capacitor C1 and the second end of the second capacitor C2 are commonly connected to form a capacitor midpoint M.
When the main control module 103 detects that the single-phase alternating current power supply 200 supplies power to the power factor correction circuit 100, the main control module 103 controls the input switching module 101 to perform first line switching, so that a live line L of the single-phase alternating current power supply 200 is connected with a first input end U and a second input end V of the three-phase bridge rectifier module 102 through the input switching module 101, and a neutral line N of the single-phase alternating current power supply 200 is connected with a third input end W and a capacitor midpoint M of the three-phase bridge rectifier module 102 through the input switching module 101; and the main control module 103 controls the three-phase bridge rectifier module 102 to rectify the single-phase alternating current power supply 200 and realize power factor correction, and simultaneously controls the bridge arm correspondingly connected with the third input end W of the three-phase bridge rectifier module 102 as an output current compensation bridge arm to generate power frequency compensation current, so as to eliminate power frequency ripple waves in the output current of the three-phase bridge rectifier module 102.
Specifically, the power factor correction circuit 100 is powered by an external ac power source 200, and the external ac power source 200 may be a single-phase ac power source or a three-phase ac power source. When the main control module 103 detects that the single-phase ac power supply 200 supplies power to the pfc circuit 100, the main control module 103 controls the input switching module 101 to perform first line switching, so that the live line L of the single-phase ac power supply 200 is connected to the first input terminal U and the second input terminal V of the three-phase bridge rectifier module 102, and the neutral line N of the single-phase ac power supply 200 is connected to the third input terminal W and the midpoint M of the capacitor of the three-phase bridge rectifier module 102. Meanwhile, the main control module 103 controls the first bridge arm and the second bridge arm which are correspondingly connected with the first input end U and the second input end V of the three-phase bridge rectifier module 102 to perform a rectification function, namely, the first bridge arm and the second bridge arm rectify the single-phase alternating current power supply 200, meanwhile, power factor correction is achieved, the third bridge arm which is correspondingly connected with the third input end W of the three-phase bridge rectifier module 102 is used as an output current compensation bridge arm, the main control module 103 controls the output current compensation bridge arm to generate power frequency compensation current, the power frequency compensation current can offset power frequency ripple (50 Hz or 60Hz ripple) in the rectified output current of the first bridge arm and the second bridge arm, therefore, the output current of the three-phase bridge rectifier module 102 does not contain power frequency ripple, and the output end of the three-phase bridge rectifier module 102 can filter the output current by adopting a capacitor with smaller capacity, the capacitor volume is reduced, and the cost is reduced.
As shown in fig. 3, fig. 3 shows a schematic diagram of a power factor correction circuit 100 powered by a three-phase ac power supply 200. When the main control module 103 detects that the three-phase ac power supply 200 supplies power to the pfc circuit 100, the main control module 103 controls the input switching module 101 to perform second line switching, so that the first phase line a, the second phase line B, the third phase line C and the neutral line N of the three-phase ac power supply 200 are respectively connected with the first input end U, the second output end V, the third input end W and the capacitor midpoint M of the three-phase bridge rectifier module 102 through the input switching module 101; and the main control module 103 controls the three-phase bridge rectifier module 102 to rectify the three-phase alternating current power supply 200 and realize power factor correction.
Specifically, when the main control module 103 detects that the three-phase ac power supply 200 supplies power to the pfc circuit 100, the main control module 103 controls the input switching module 101 to perform the second line switching, so that the first phase line a, the second phase line B, the third phase line C and the neutral line N of the three-phase ac power supply 200 are respectively connected to the first input end U, the second output end V, the third input end W and the capacitor midpoint M of the three-phase bridge rectifier module 102. Meanwhile, the main control module 103 controls three bridge arms of the three-phase bridge rectifier module 102 to rectify the three-phase alternating current power supply 200, and power factor correction is achieved. The rectification and power factor correction of the three-phase ac power supply 200 are performed by using existing three-phase rectification and power factor correction techniques, which are not described herein.
As shown in fig. 4, the power factor correction circuit 100 of the present invention further includes a current sampling module.
The current sampling module acquires an alternating current output current value I in of the single-phase alternating current power supply 200 and a third current value I L3 flowing through a third input end W of the three-phase bridge rectifier module 102, and outputs an alternating current output current value I in and a third current value I L3 to the main control module 103;
The main control module 103 generates a control signal of the output current compensation bridge arm according to the difference value between the alternating current output current value I in and the third current value I L3, so that the output current compensation bridge arm generates power frequency compensation current.
Specifically, fig. 5 shows a control block diagram of the output current compensation bridge arm, where the current sampling module collects an ac output current value I in of the single-phase ac power supply 200 and a third current value I L3 flowing through a third input terminal W of the three-phase bridge rectifier module 102, and outputs the values to the main control module 103. The main control module 103 takes the alternating current output current value I in as a reference current value, takes the third current value I L3 as a current value to be regulated, calculates the difference value between the alternating current output current value I in and the third current value I L3, obtains a PWM control signal after passing through a PI regulator, obtains switching control signals of two switching tubes in an output current compensation bridge arm after passing through a PWM generator, and further enables the output current compensation bridge arm to generate power frequency compensation current.
More specifically, the main control module 103 performs PI adjustment on the difference between the ac output current value I in and the third current value I L3, so that the third current value I L3 is half of the ac output current value I in, and thus the power frequency compensation current in the output current compensation bridge arm of the three-phase bridge rectifier module 102 can offset the power frequency ripple in the rectified output current of the first bridge arm and the second bridge arm of the three-phase bridge rectifier module 102, and further the output current of the three-phase bridge rectifier module 102 does not contain the power frequency ripple.
As shown IN fig. 6, the input switching module 101 of the pfc circuit 100 has a first input terminal IN1, a second input terminal IN2, a third input terminal IN3, a fourth input terminal IN4, a first output terminal O1, a second output terminal O2, a third output terminal O3, and a fourth output terminal O4; the first output end O1, the second output end O2, the third output end O3, and the fourth output end O4 of the input switching module 101 are respectively connected to the first input end U, the second input end V, the third input end W, and the capacitor midpoint M of the three-phase bridge rectifier module 102.
As shown IN fig. 6, when the main control module 103 detects that the single-phase ac power supply 200 supplies power to the pfc circuit 100, the main control module 103 controls the input switching module 101 to perform first line switching so that the second input terminal IN2 of the input switching module 101 is connected to the first output terminal O1 and the second output terminal O2 of the input switching module 101, the first input terminal IN1 of the input switching module 101 is suspended, and the second input terminal IN2 of the input switching module 101 is connected to the live line L of the single-phase ac power supply 200; or as shown IN fig. 7, when two parallel single-phase ac power supplies 200 supply power to the pfc circuit 100, the first input terminal IN1, the second input terminal IN2, the first output terminal O1 and the second output terminal O2 of the input switching module 101 are connected together, and the first input terminal IN1 and the second input terminal IN2 of the input switching module 101 are respectively connected to the live line L of the single-phase ac power supply 200; and suspending the third input IN3 of the input switching module 101, wherein the fourth input IN4 of the input switching module 101 is connected to the third output O3 and the fourth output O4 of the input switching module 101, and the fourth input IN4 of the input switching module 101 is connected to the neutral line N of the single-phase ac power supply 200.
Specifically, the input switching module 101 includes a plurality of switches, and the main control module 103 implements line switching by controlling on and off of the switches.
Specifically, as shown IN fig. 6, when the single-phase ac power supply 200 supplies power to the pfc circuit 100, the main control module 103 controls the input switching module 101 to perform the first line switching so that the second input terminal IN2 of the input switching module 101 is connected to the first output terminal O1 and the second output terminal O2 of the input switching module 101, the first input terminal IN1 of the input switching module 101 is suspended, and the second input terminal IN2 of the input switching module 101 is connected to the live line of the single-phase ac power supply 200; and suspending the third input IN3 of the input switching module 101, wherein the fourth input IN4 of the input switching module 101 is connected to the third output O3 and the fourth output O4 of the input switching module 101, and the fourth input IN4 of the input switching module 101 is connected to the neutral line N of the single-phase ac power supply 200. As shown IN fig. 7, when two parallel single-phase ac power supplies 200 supply power to the pfc circuit 100, the main control module 103 controls the input switching module 101 to perform a first line switching, so that the first input terminal IN1, the second input terminal IN2, the first output terminal O1 and the second output terminal O2 of the input switching module 101 are commonly connected, and the first input terminal IN1 and the second input terminal IN2 of the input switching module 101 are respectively connected to a live line L of the single-phase ac power supply 200; and suspending the third input IN3 of the input switching module 101, wherein the fourth input IN4 of the input switching module 101 is connected to the third output O3 and the fourth output O4 of the input switching module 101, and the fourth input IN4 of the input switching module 101 is connected to the neutral line N of the single-phase ac power supply 200.
As shown IN fig. 3, when the main control module 103 detects that the three-phase ac power supply 200 supplies power to the pfc circuit 100, the main control module 103 controls the input switching module 101 to perform the second line switching, so that the first input terminal IN1, the second input terminal IN2, the third input terminal IN3, and the fourth input terminal IN4 of the input switching module 101 are respectively connected to the first output terminal O1, the second output terminal O2, the third output terminal O3, and the fourth output terminal O4 of the input switching module 101, and the first input terminal IN1, the second input terminal IN2, the third input terminal IN3, and the fourth input terminal IN4 of the input switching module 101 are respectively connected to the first phase line a, the second phase line B, the third phase line C, and the neutral line N of the three-phase ac power supply 200.
Specifically, IN the above description, the descriptions of the first input terminal IN1, the second input terminal IN2, and the third input terminal IN3 of the input switching module 101 do not indicate that the three input terminals have a sequential relationship or a positional relationship, but are only used for distinguishing the three input terminals of the input switching module 101; similarly, the descriptions of the first output terminal O1, the second output terminal O2, and the third output terminal O3 of the input switching module 101 and the first input terminal U, the second input terminal V, and the third input terminal W of the three-phase bridge rectifier module 102 are only used for distinguishing the descriptions. The above embodiment only provides a specific application scenario, and all equivalent modifications belonging to the above embodiment are within the protection scope of the present invention. Equivalent variations include, but are not limited to, the following: when the single-phase ac power supply 200 supplies power to the pfc circuit 100, the main control module 103 controls the input switching module 101 to perform the first line switching such that the first input terminal IN1 of the input switching module 101 is connected to the first output terminal O1 and the second output terminal O2 of the input switching module 101, the second input terminal IN2 of the input switching module 101 is suspended, and the first input terminal IN1 of the input switching module 101 is connected to the hot line L of the single-phase ac power supply 200.
As shown in fig. 8, the three-phase bridge rectifier module 102 in the power factor correction circuit 100 includes a first inductor L1, a second inductor L2, a third inductor L3, a first switching tube Q1, a second switching tube Q2, a third switching tube Q3, a fourth switching tube Q4, a fifth switching tube Q5, and a sixth switching tube Q6.
The first end of the first inductor L1, the first end of the second inductor L2, and the first end of the third inductor L3 are the first input end U, the second input end V, and the third input end W of the three-phase bridge rectifier module 102, respectively; the first end of the first switching tube Q1, the first end of the third switching tube Q3 and the first end of the fifth switching tube Q5 are commonly connected to form a first output end of the three-phase bridge rectifier module 102, and the first end of the second switching tube Q2, the first end of the fourth switching tube Q4 and the first end of the sixth switching tube Q6 are commonly connected to form a second output end of the three-phase bridge rectifier module 102; the second end of the first switching tube Q1 and the second end of the second switching tube Q2 are both connected with the second end of the first inductor L1, the second end of the third switching tube Q3 and the second end of the fourth switching tube Q4 are both connected with the second end of the second inductor L2, and the second end of the fifth switching tube Q5 and the second end of the sixth switching tube Q6 are both connected with the second end of the third inductor L3.
Specifically, the first switching tube Q1 and the second switching tube Q2 form a first bridge arm, the third switching tube Q3 and the fourth switching tube Q4 form a second bridge arm, and the fifth switching tube Q5 and the sixth switching tube Q6 form a third bridge arm. The first switching tube Q1, the second switching tube Q2, the third switching tube Q3, the fourth switching tube Q4, the fifth switching tube Q5 and the sixth switching tube Q6 may be NMOS tubes.
As shown in fig. 8 or 9, the input switching module 101 in the pfc circuit 100 includes a first switch S1, a second switch S2, a third switch S3, a fourth switch S4, and a fifth switch S5.
The first connection end of the first switch S1, the first connection end of the second switch S2, and the first connection end of the third switch S3 are the first input end IN1, the second input end IN2, and the third input end IN3 of the input switching module 101, respectively; the second connection end of the first switch S1, the second connection end of the second switch S2, and the second connection end of the third switch S3 are respectively the first output end O1, the second output end O2, and the third output end O3 of the input switching module 101; the first connecting end and the second connecting end of the fourth switch S4 are respectively connected with the second connecting end of the first switch S1 and the first connecting end of the second switch S2; the first connection terminal of the fifth switch S5 is connected to the second connection terminal of the third switch S3, and the second connection terminal of the fifth switch S5 is the fourth input terminal IN4 and the fourth output terminal O4 of the input switching module 101.
As shown in fig. 8, when the main control module 103 detects that the single-phase ac power supply 200 supplies power to the pfc circuit 100, the main control module 103 controls the second switch S2, the fourth switch S4, and the fifth switch S5 to be closed, and controls the first switch S1 and the third switch S3 to be opened.
Specifically, the main control module 103 controls the second switch S2, the fourth switch S4, and the fifth switch S5 to be closed, and controls the first switch S1 and the third switch S3 to be opened at the same time, so that the live wire L of the single-phase ac power supply 200 is connected to the first input terminal U and the second input terminal V of the three-phase bridge rectifier module 102, and the neutral wire N of the single-phase ac power supply 200 is connected to the third input terminal W and the capacitor midpoint M of the three-phase bridge rectifier module 102.
As shown in fig. 9, when the main control module 103 detects that the three-phase ac power supply 200 supplies power to the pfc circuit 100, the main control module 103 controls the first switch S1, the second switch S2, and the third switch S3 to be closed, and controls the fourth switch S4 and the fifth switch S5 to be opened.
Specifically, the main control module 103 controls the first switch S1, the second switch S2, and the third switch S3 to be turned on, and controls the fourth switch S4 and the fifth switch S5 to be turned off, so that the first phase line a, the second phase line B, the third phase line C, and the neutral line N of the three-phase ac power supply 200 are respectively connected to the first input terminal U, the second input terminal V, the third input terminal W, and the capacitor midpoint M of the three-phase bridge rectifier module 102.
Specifically, this embodiment provides a specific application scenario for the switch setting in the input switching module 101, and all equivalent modifications with the same technical effects as the above embodiment are within the protection scope of the present invention. Equivalent variations of the above embodiments include, but are not limited to, the following: the first switch S1 and the fourth switch S4 may be replaced by a single pole double throw switch; the third switch S3 and the fifth switch S5 may be replaced by a single pole double throw switch; equivalent variations of the connection relationship between the first switch S1, the second switch S2, the third switch S3, the fourth switch S4, and the fifth switch S5 are described above.
As shown in fig. 10 or 11, the input switching module 101 in the pfc circuit 100 includes a sixth switch S6, a seventh switch S7, an eighth switch S8, a ninth switch S9, and a tenth switch S10.
The first connection end of the sixth switch S6, the first connection end of the seventh switch S7, and the first connection end of the eighth switch S8 are the first input end IN1, the second input end IN2, and the third input end IN3 of the input switching module 101, respectively; the second connection end of the sixth switch S6, the second connection end of the seventh switch S7, and the second connection end of the eighth switch S8 are the first output end O1, the second output end O2, and the third output end O3 of the input switching module 101, respectively; the first connecting end and the second connecting end of the ninth switch S9 are respectively connected with the first connecting end of the sixth switch S6 and the first connecting end of the seventh switch S7; the first connection terminal of the tenth switch S10 is connected to the second connection terminal of the eighth switch S8, and the second connection terminals of the tenth switch S10 are the fourth input terminal IN4 and the fourth output terminal O4 of the input switching module 101.
As shown in fig. 10, when the main control module 103 detects that the single-phase ac power supply 200 supplies power to the pfc circuit 100, the main control module 103 controls the sixth switch S6, the seventh switch S7, the ninth switch S9, and the tenth switch S10 to be closed, and controls the eighth switch S8 to be opened.
Specifically, when the two parallel single-phase ac power supplies 200 supply power to the pfc circuit 100, the main control module 103 controls the sixth switch S6, the seventh switch S7, the ninth switch S9, and the tenth switch S10 to be closed, and controls the eighth switch S8 to be opened at the same time, so that the live line L of the two parallel single-phase ac power supplies 200 is connected to the first input terminal U and the second input terminal V of the three-phase bridge rectifier module 102, and the neutral line N of the two parallel single-phase ac power supplies 200 is connected to the third input terminal W and the midpoint M of the capacitance of the three-phase bridge rectifier module 102.
As shown in fig. 11, when the main control module 103 detects that the three-phase ac power supply 200 supplies power to the pfc circuit 100, the main control module 103 controls the sixth switch S6, the seventh switch S7, and the eighth switch S8 to be closed, and controls the ninth switch S9 and the tenth switch S10 to be opened.
Specifically, the main control module 103 controls the sixth switch S6, the seventh switch S7, and the eighth switch S8 to be turned on, and controls the ninth switch S9 and the tenth switch S10 to be turned off, so that the first phase line a, the second phase line B, the third phase line C, and the neutral line N of the three-phase ac power supply 200 are respectively connected to the first input terminal U, the second input terminal V, the third input terminal W, and the capacitor midpoint M of the three-phase bridge rectifier module 102.
Specifically, this embodiment provides a specific application scenario for the switch setting in the input switching module 101, and all equivalent modifications with the same technical effects as the above embodiment are within the protection scope of the present invention. Equivalent variations of the above embodiments include, but are not limited to, the following: the eighth switch S8 and the tenth switch S10 may be replaced by a single pole double throw switch; equivalent variations of the connection relationship between the sixth switch S6, the seventh switch S7, the eighth switch S8, the ninth switch S9, and the tenth switch S10 are described above.
The following describes the operation principle of the circuit according to the present invention when the circuit is operated in the single-phase ac power supply 200 power supply mode with reference to fig. 8:
When the main control module 103 detects that the single-phase ac power supply 200 supplies power to the pfc circuit 100, the main control module 103 controls the first switch S1 and the third switch S3 to be turned off, and controls the second switch S2, the fourth switch S4 and the fifth switch S5 to be turned on, and the live wire L of the single-phase ac power supply 200 is connected with the first input end U and the second input end V of the three-phase bridge rectifier module 102, and the neutral wire N of the single-phase ac power supply 200 is connected with the third input end W and the capacitor midpoint M of the three-phase bridge rectifier module 102.
The main control module 103 controls the first bridge arm and the second bridge arm (i.e., the first switching tube Q1, the second switching tube Q2, the third switching tube Q3 and the fourth switching tube Q4) in the three-phase bridge rectifier module 102 to work in a rectification mode, rectifies the ac current output by the single-phase ac power supply 200, and simultaneously realizes power factor correction, and simultaneously controls the third bridge arm (the fifth switching tube Q5 and the sixth switching tube Q6) in the three-phase bridge rectifier module 102 to generate power frequency compensation current. The specific process of the main control module 103 generating the third bridge arm control signal is as follows: the current sampling module collects an alternating current output current value I in of the single-phase alternating current power supply 200 and a third current value I L3 flowing through a third input end W of the three-phase bridge rectifier module 102, and the main control module 103 performs PI adjustment on the difference value of the two current values, so that PWM control signals of a fifth switching tube Q5 and a sixth switching tube Q6 in a third bridge arm are obtained.
The specific working process is as follows:
When the ac output current value I in of the single-phase ac power supply 200 is greater than zero, the three-phase bridge rectifier module 102 operates in a positive half cycle, the second switching tube Q2 and the fourth switching tube Q4 serve as active switches to forward charge the first inductor L1 and the second inductor L2 with a certain duty ratio, and the first switching tube Q1 and the third switching tube Q3 serve as synchronous rectifier switches to release the currents of the first inductor L1 and the second inductor L2 to the load side. Namely, when the second switching tube Q2 and the fourth switching tube Q4 are turned on, current flows from the live wire L through the first inductor L1 and the second inductor L2, the second switching tube Q2 and the fourth switching tube Q4, the first capacitor C1 and the second capacitor C2, the fifth switching tube Q5 and the sixth switching tube Q6, and the load returns to the neutral wire N. When the first switching tube Q1 and the third switching tube Q3 are rectified synchronously, current flows from the live wire L through the first inductor L1 and the second inductor L2, the first switching tube Q1 and the third switching tube Q3, the first capacitor C1 and the second capacitor C2, the fifth switching tube Q5 and the sixth switching tube Q6, and the load returns to the neutral wire N.
When the ac output current value I in of the single-phase ac power supply 200 is less than zero, the three-phase bridge rectifier module 102 operates in the negative half cycle, the first switching tube Q1 and the third switching tube Q3 are used as active switches to reversely charge the first inductor L1 and the second inductor L2 with a certain duty ratio, and the second switching tube Q2 and the fourth switching tube Q4 are used as synchronous rectifier switches to release the current of the first inductor L1 and the second inductor L2 to the first capacitor C1 and the second capacitor C2. Namely, when the first switching tube Q1 and the third switching tube Q3 are turned on, the current returns to the live wire L from the neutral wire N through the first capacitor C1 and the second capacitor C2, the fifth switching tube Q5 and the sixth switching tube Q6, the load, the first switching tube Q1 and the third switching tube Q3, the first inductor L1 and the second inductor L2. When the second switching tube Q2 and the fourth switching tube Q4 are rectified synchronously, the current flows from the neutral line N through the first capacitor C1 and the second capacitor C2, the fifth switching tube Q5 and the sixth switching tube Q6, the load, the second switching tube Q2 and the fourth switching tube Q4, the first inductor L1 and the second inductor L2, and then returns to the live line L. In this process, the load circuit is charged, and since the load and the series branch of the first capacitor C1 and the second capacitor C2 are in parallel connection, the load can obtain a stable charging voltage.
The ac output current waveform I in of the single-phase ac power supply 200 and the third current waveform I L3 flowing through the third input terminal W of the three-phase bridge rectifier module 102 are shown in fig. 13. The output current waveforms I bus and I com of the first bridge arm and the second bridge arm of the three-phase bridge rectifier module 102, the current waveform I C of the fifth switching tube Q5 and the first capacitor C1 are shown in fig. 14, and the current direction marks are shown in fig. 8.
When the power factor correction circuit provided by the invention is powered by a single-phase alternating current power supply, the first input end and the second input end of the three-phase bridge rectifier module are commonly connected to a live wire of the single-phase alternating current power supply, the third input end of the three-phase bridge rectifier module and the midpoint of the capacitor are commonly connected to the central line of the single-phase alternating current power supply, the three-phase bridge rectifier module rectifies the single-phase alternating current power supply, and meanwhile, the third input end of the three-phase bridge rectifier module is correspondingly connected with a bridge arm to generate power frequency compensation current, and the power frequency compensation current can eliminate power frequency ripple waves in the output current of the three-phase bridge rectifier module. Therefore, the required capacity of the output capacitor is reduced, the capacitor volume is reduced, and the cost is reduced, so that the volume of the power factor correction circuit is reduced, and the cost is reduced.
In view of the above application advantages of the power factor correction circuit 100 in a vehicle-mounted charger, the present invention further provides a vehicle-mounted charger, as shown in fig. 12, including the power factor correction circuit 100 and the DC-DC conversion circuit 300.
The first output end and the second output end of the three-phase bridge rectifier module 102 in the power factor correction circuit 100 are respectively connected with the first input end and the second input end of the DC-DC conversion circuit 300, and the output end of the DC-DC conversion circuit 300 is connected with the vehicle-mounted high-voltage battery.
Specifically, the vehicle-mounted charger is connected to the external ac power supply 200, the external ac power supply 200 may be a single-phase ac power supply or a three-phase ac power supply, the power factor correction circuit 100 rectifies the ac power supply 200 and realizes power factor correction, and outputs a direct current to the DC-DC conversion circuit 300, and the DC-DC conversion circuit 300 performs electric energy conversion on the direct current and outputs the converted direct current to charge the vehicle-mounted high-voltage battery. The DC-DC conversion circuit 300 may be an LLC resonant circuit, among others.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. The power factor correction circuit is characterized by comprising an input switching module, a three-phase bridge rectifier module, a main control module, a first capacitor and a second capacitor;
The first end of the first capacitor and the first end of the second capacitor are respectively connected with the first output end and the second output end of the three-phase bridge rectifier module, and the second end of the first capacitor and the second end of the second capacitor are connected together to form a capacitor midpoint;
When the main control module detects that a single-phase alternating current power supply supplies power to the power factor correction circuit, the main control module controls the input switching module to execute first line switching so that a live wire of the single-phase alternating current power supply is connected with a first input end and a second input end of the three-phase bridge rectifier module through the input switching module, and a neutral wire of the single-phase alternating current power supply is connected with a third input end of the three-phase bridge rectifier module and the midpoint of the capacitor through the input switching module; and the main control module controls the three-phase bridge rectifier module to rectify the single-phase alternating current power supply and realize power factor correction, and simultaneously controls a bridge arm correspondingly connected with a third input end of the three-phase bridge rectifier module to serve as an output current compensation bridge arm, and generates a control signal of the output current compensation bridge arm according to a difference value between an alternating current output value of the single-phase alternating current source and a third current value flowing through the third input end of the three-phase bridge rectifier module, so that the output current compensation bridge arm generates power frequency compensation current, and further power frequency ripple waves in the output current of the three-phase bridge rectifier module are eliminated.
2. The power factor correction circuit of claim 1, wherein when the master control module detects that a three-phase ac power source supplies power to the power factor correction circuit, the master control module controls the input switching module to perform second line switching so that a first phase line, a second phase line, a third phase line and a neutral line of the three-phase ac power source are respectively connected with a first input end, a second output end, a third input end and the capacitor neutral point of the three-phase bridge rectifier module through the input switching module; and the main control module controls the three-phase bridge rectifier module to rectify the three-phase alternating current power supply and realize power factor correction.
3. The power factor correction circuit of claim 1, further comprising a current sampling module;
The current sampling module acquires an alternating current output current value of the single-phase alternating current power supply and a third current value flowing through a third input end of the three-phase bridge rectifier module, and outputs the alternating current output current value and the third current value to the main control module;
and the main control module generates a control signal of the output current compensation bridge arm according to the difference value of the alternating current output current value and the third current value so as to enable the output current compensation bridge arm to generate power frequency compensation current.
4. The power factor correction circuit of claim 2, wherein the input switching module has a first input terminal, a second input terminal, a third input terminal, a fourth input terminal, a first output terminal, a second output terminal, a third output terminal, and a fourth output terminal; the first output end, the second output end, the third output end and the fourth output end of the input switching module are respectively connected with the first input end, the second input end, the third input end and the midpoint of the capacitor of the three-phase bridge rectifier module;
When the main control module detects that a single-phase alternating current power supply supplies power to the power factor correction circuit, the main control module controls the input switching module to execute first circuit switching so that a second input end of the input switching module is connected with a first output end and a second output end of the input switching module, the first input end of the input switching module is suspended, and the second input end of the input switching module is connected to a live wire of the single-phase alternating current power supply; or the first input end, the second input end, the first output end and the second output end of the input switching module are connected together, and the first input end and the second input end of the input switching module are respectively connected with a live wire of a single-phase alternating current power supply; and suspending the third input end of the input switching module, wherein the fourth input end of the input switching module is connected with the third output end and the fourth output end of the input switching module, and the fourth input end of the input switching module is connected to the central line of the single-phase alternating current power supply.
5. The power factor correction circuit of claim 4, wherein when the master control module detects that a three-phase ac power source supplies power to the power factor correction circuit, the master control module controls the input switching module to perform a second line switching so that a first input end, a second input end, a third input end and a fourth input end of the input switching module are respectively connected with a first output end, a second output end, a third output end and a fourth output end of the input switching module, and the first input end, the second input end, the third input end and the fourth input end of the input switching module are respectively connected with a first phase line, a second phase line, a third phase line and a neutral line of the three-phase ac power source.
6. The power factor correction circuit of claim 1, wherein the three-phase bridge rectifier module comprises a first inductor, a second inductor, a third inductor, a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube, and a sixth switching tube;
The first end of the first inductor, the first end of the second inductor and the first end of the third inductor are respectively a first input end, a second input end and a third input end of the three-phase bridge rectifier module; the first end of the first switching tube, the first end of the third switching tube and the first end of the fifth switching tube are connected together to form a first output end of the three-phase bridge rectifier module, and the first end of the second switching tube, the first end of the fourth switching tube and the first end of the sixth switching tube are connected together to form a second output end of the three-phase bridge rectifier module; the second end of the first switching tube and the second end of the second switching tube are connected with the second end of the first inductor, the second end of the third switching tube and the second end of the fourth switching tube are connected with the second end of the second inductor, and the second end of the fifth switching tube and the second end of the sixth switching tube are connected with the second end of the third inductor.
7. The power factor correction circuit of claim 5, wherein the input switching module comprises a first switch, a second switch, a third switch, a fourth switch, and a fifth switch;
The first connecting end of the first switch, the first connecting end of the second switch and the first connecting end of the third switch are respectively a first input end, a second input end and a third input end of the input switching module; the second connection end of the first switch, the second connection end of the second switch and the second connection end of the third switch are respectively a first output end, a second output end and a third output end of the input switching module; the first connecting end and the second connecting end of the fourth switch are respectively connected with the second connecting end of the first switch and the first connecting end of the second switch; the first connecting end of the fifth switch is connected with the second connecting end of the third switch, and the second connecting end of the fifth switch is a fourth input end and a fourth output end of the input switching module;
When the main control module detects that a single-phase alternating current power supply supplies power to the power factor correction circuit, the main control module controls the fourth switch, the second switch and the fifth switch to be closed, and simultaneously controls the first switch and the third switch to be opened;
when the main control module detects that the three-phase alternating current power supply supplies power to the power factor correction circuit, the main control module controls the first switch, the second switch and the third switch to be closed, and simultaneously controls the fourth switch and the fifth switch to be opened.
8. The power factor correction circuit of claim 5, wherein the input switching module comprises a sixth switch, a seventh switch, an eighth switch, a ninth switch, and a tenth switch;
The first connection end of the sixth switch, the first connection end of the seventh switch and the first connection end of the eighth switch are respectively a first input end, a second input end and a third input end of the input switching module; the second connection end of the sixth switch, the second connection end of the seventh switch and the second connection end of the eighth switch are respectively a first output end, a second output end and a third output end of the input switching module; the first connecting end and the second connecting end of the ninth switch are respectively connected with the first connecting end of the sixth switch and the first connecting end of the seventh switch; the first connecting end of the tenth switch is connected with the second connecting end of the eighth switch, and the second connecting end of the tenth switch is a fourth input end and a fourth output end of the input switching module;
When the main control module detects that a single-phase alternating current power supply supplies power to the power factor correction circuit, the main control module controls the sixth switch, the seventh switch, the ninth switch and the tenth switch to be closed, and simultaneously controls the eighth switch to be opened;
When the main control module detects that the three-phase alternating current power supply supplies power for the power factor correction circuit, the main control module controls the sixth switch, the seventh switch and the eighth switch to be closed, and simultaneously controls the ninth switch and the tenth switch to be opened.
9. A vehicle-mounted charger, characterized in that the vehicle-mounted charger comprises the power factor correction circuit and the DC-DC conversion circuit according to any one of claims 1 to 8;
the first output end and the second output end of the three-phase bridge rectifier module in the power factor correction circuit are respectively connected with the first input end and the second input end of the DC-DC conversion circuit, and the output end of the DC-DC conversion circuit is connected with the vehicle-mounted high-voltage battery.
10. The charger of claim 9 wherein said DC-DC conversion circuit is an LLC resonant circuit.
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| CN111478573B (en) * | 2020-04-16 | 2023-09-12 | 深圳威迈斯新能源股份有限公司 | Power factor adjustment framework suitable for single-phase and three-phase power grid and control method thereof |
| CN111391696A (en) * | 2020-04-16 | 2020-07-10 | 深圳威迈斯新能源股份有限公司 | Single-three phase compatible bidirectional charger control circuit with optimal capacitance value |
| CN112134336B (en) * | 2020-08-06 | 2021-06-29 | 上海万暨电子科技有限公司 | Control method of PFC circuit based on compatible single-phase and three-phase alternating-current input |
| CN117134471B (en) * | 2022-03-24 | 2024-04-12 | 华为电动技术有限公司 | Charger, vehicle, charging method and medium |
| CN114915159B (en) * | 2022-07-18 | 2022-10-25 | 浙江大学杭州国际科创中心 | Power factor correction rectifier |
| CN117277859B (en) * | 2023-09-27 | 2024-04-16 | 上海泛腾半导体技术有限公司 | Driving circuit and application |
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Address after: 215000 52 tianedang Road, Yuexi, Wuzhong District, Suzhou City, Jiangsu Province Applicant after: Suzhou Huichuan United Power System Co.,Ltd. Address before: 215100 No.52, tianedang Road, Yuexi, Wuzhong District, Suzhou City, Jiangsu Province Applicant before: SUZHOU HUICHUAN UNITED POWER SYSTEM Co.,Ltd. |
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