CN110474526B - Current conversion circuit and charging device - Google Patents
Current conversion circuit and charging device Download PDFInfo
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- CN110474526B CN110474526B CN201910727577.5A CN201910727577A CN110474526B CN 110474526 B CN110474526 B CN 110474526B CN 201910727577 A CN201910727577 A CN 201910727577A CN 110474526 B CN110474526 B CN 110474526B
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 56
- 239000003990 capacitor Substances 0.000 claims abstract description 77
- 230000009466 transformation Effects 0.000 claims description 13
- 238000010586 diagram Methods 0.000 description 10
- 238000004804 winding Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 230000007935 neutral effect Effects 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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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- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Rectifiers (AREA)
Abstract
The invention provides a current conversion circuit and a charging device, wherein the current conversion circuit comprises a power factor correction module and a current conversion module; the power factor correction module comprises a first filter capacitor bank, a second filter capacitor bank, at least one half-bridge arm, a first terminal and a second terminal, wherein two ends of the half-bridge arm are respectively connected to the positive bus and the negative bus, and the first terminal is connected to the middle point of the half-bridge arm; the second terminal is connected to an intermediate connection point; the current conversion module comprises a first current processing unit and a second current processing unit, the output ends of the first current processing unit and the second current processing unit are connected in parallel, the input end of the first current processing unit is connected in series between the positive bus and the middle connecting point, and the input end of the second current processing unit is connected in series between the middle connecting point and the negative bus. The embodiment of the invention can obviously reduce the voltage ripple of the filter capacitor of the power factor correction module, thereby improving the power density.
Description
Technical Field
The embodiment of the invention relates to the field of power electronic equipment, in particular to a current conversion circuit and a charging device.
Background
PFC (Power Factor Correction ) circuits are an electronic circuit used in the field of power electronics to increase the power factor of powered devices. Along with the continuous development of power electronics technology, miniaturization, low cost and high efficiency become the continuous development direction.
Half-bridge rectification is commonly adopted in the PFC circuit at present. However, in single-phase electric rectification, since the ac power input by the single-phase electric rectification module is discontinuous, when the PFC circuit is used as a front stage of a dc conversion module (for example, a dc conversion module in an on-vehicle charger) or other modules, a larger capacitor is required for maintaining the stability of the output voltage.
As shown in fig. 1, a circuit schematic diagram of the PFC circuit for a charger is shown. In this application, PFC module 11 is a preceding stage of dc conversion module 12. The PFC module 11 is composed of a plurality of half-bridge arms and an upper group of electrolytic capacitors C0 and a lower group of electrolytic capacitors C0, the live wire L of the power grid is connected to the midpoint of each half-bridge arm 111 through a Boost inductor L0, and the zero line N of the power grid is connected to the connection point of the upper group of electrolytic capacitors C0 and the lower group of electrolytic capacitors C0.
The current waveform which enters the electrolytic capacitor C0 after being rectified by the PFC module is mainly a component of the power grid frequency. Although the half-bridge rectifying mode can save one phase-change bridge arm and save the cost of a semiconductor device, as the rectified current is power frequency current, a larger electrolytic capacitor is needed to absorb current ripple, so that the size of the PFC module is increased, and the power density of the whole machine (such as a vehicle-mounted charger) is not facilitated to be improved.
Disclosure of Invention
Aiming at the problems that the PFC module using half-bridge rectification needs a larger electrolytic capacitor to absorb current ripple and causes larger volume of the PFC module, and is not beneficial to improving power density, the embodiment of the invention provides a current conversion circuit and a charging device.
The technical scheme for solving the technical problems is that the embodiment of the invention provides a current conversion circuit which comprises a power factor correction module and a current conversion module; wherein:
The power factor correction module comprises a first filter capacitor bank, a second filter capacitor bank, at least one half-bridge arm, a first terminal used for connecting a power grid live wire and a second terminal used for connecting a power grid zero line, wherein the first filter capacitor bank and the second filter capacitor bank are connected in series between a positive bus and a negative bus, two ends of the half-bridge arm are respectively connected to the positive bus and the negative bus, and the first terminal is connected to the middle point of the half-bridge arm; the second terminal is connected to an intermediate connection point, and the intermediate connection point is a connection point of the first filter capacitor group and the second filter capacitor group;
The current conversion module comprises a first current processing unit and a second current processing unit, wherein the output ends of the first current processing unit and the second current processing unit are connected in parallel, the input end of the first current processing unit is connected in series between the positive bus and the middle connecting point, and the input end of the second current processing unit is connected in series between the middle connecting point and the negative bus.
Preferably, the power factor correction module comprises a plurality of half-bridge arms, and the midpoint of each half-bridge arm is connected to the first terminal via one inductor respectively.
Preferably, each half bridge arm includes a first switching tube and a second switching tube connected in series between the positive bus and the negative bus, and a midpoint of the half bridge arm is a connection point of the first switching tube and the second switching tube.
Preferably, the first current handling unit and the second current handling unit are respectively resonant converters.
Preferably, the resonant converter comprises a chopper subunit, a passive network, a transformer subunit and a rectifier subunit, and the chopper subunit, the passive network, the transformer subunit and the rectifier subunit are sequentially connected between an input end and an output end of the resonant converter.
Preferably, the capacitance value of the first filter capacitor group is equal to the capacitance value of the second filter capacitor group.
Preferably, the current conversion module includes a third filter capacitor, a positive output terminal, and a negative output terminal, the output ends of the first and second current processing units are respectively connected to the positive and negative output terminals, and the third filter capacitor is connected in series between the positive and negative output terminals.
The embodiment of the invention also provides a charging device which comprises the current conversion circuit.
According to the current conversion circuit and the charging device, the midpoint of the filter capacitor of the power factor correction module is connected with the input midpoint of the current conversion module at the later stage, so that voltage ripple of the filter capacitor of the power factor correction module can be remarkably reduced, the capacity of the filter capacitor of the power factor correction module can be reduced, and the power density is improved.
Drawings
FIG. 1 is a schematic diagram of a conventional PFC module applied to a charger;
FIG. 2 is a schematic diagram of a current conversion circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a current conversion circuit according to another embodiment of the present invention;
Fig. 4 is a schematic waveform diagram of current transformation performed by the current transformation circuit according to the embodiment of the present invention;
fig. 5 is a schematic waveform diagram of current conversion performed by a current conversion circuit using a power factor correction module as a preceding stage.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Fig. 2 is a schematic diagram of a current conversion circuit according to an embodiment of the present invention, which is applicable to power electronic devices, such as a charger with single-phase ac as an input. The current conversion circuit of the present embodiment includes a power factor correction module 21 and a current conversion module 22, where an input end of the power factor correction module 21 is connected to a single-phase alternating current (for example, a power grid, specifically, the single-phase alternating current may be a voltage obtained by passing a live wire and a neutral wire of the power grid through an electromagnetic compatibility filter), an output end is connected to a positive bus V bus + and a negative bus V bus -, and an input end of the current conversion module 22 is connected to a positive bus V bus + and a negative bus V bus -, and an output end is connected to a load (for example, a dc battery).
The power factor correction module 21 processes single-phase alternating current (for example, from an electric network) through half-bridge rectification, the power factor correction unit 21 specifically may include a first filter capacitor group C21, a second filter capacitor group C22, a plurality of half-bridge arms 211, a first terminal and a second terminal, and the power factor correction module 21 may be connected to a power network live wire L (i.e., a live wire of the single-phase alternating current) through the first terminal and to a power network neutral wire N (i.e., a neutral wire of the single-phase alternating current) through the second terminal. The first filter capacitor bank C21 and the second filter capacitor bank C22 may include a plurality of capacitors connected in series and/or in parallel, respectively, and the first filter capacitor bank C21 and the second filter capacitor bank C22 are connected in series between the positive bus V bus + and the negative bus V bus -. One end of each half bridge arm 211 is connected with a positive bus V bus + and the other end is connected with a positive bus V bus -, and the midpoint of each half bridge arm 211 is connected to a first terminal through a Boost (Boost) inductor L1; also, the second terminal of the pfc module is also connected to an intermediate connection point V m, where the intermediate connection point V m is a connection point of the first filter capacitor group C21 and the second filter capacitor group C22, that is, the plurality of half-bridge arms 211 are connected in parallel in a staggered manner. The plurality of half-bridge arms 211 can thereby perform current waveform correction (correct waveform distortion of the single-phase alternating current due to capacitive load) on the input single-phase alternating current, and improve the power factor of the single-phase alternating current.
The current conversion module 22 includes a first current processing unit 221 and a second current processing unit 222, wherein the output ends of the first current processing unit 221 and the second current processing unit 222 are connected in parallel, and the input end of the first current processing unit 221 is connected in series between a positive bus V bus + and an intermediate connection point V m (i.e., the positive terminal of the input end of the first current processing unit 221 is connected with the positive bus V bus + and the negative terminal is connected with the intermediate connection point V m), and the input end of the second current processing unit 222 is connected in series between the intermediate connection point V m and the negative bus V bus "(i.e., the positive terminal of the input end of the second current processing unit 222 is connected with the intermediate connection point V m and the negative terminal is connected with the negative bus V bus -), i.e., the first current processing unit 221 and the second current processing unit 222 form a topology structure of a primary-secondary parallel.
In the above-mentioned current conversion circuit, the front stage adopts the power factor correction module 21, the rear stage adopts the first current processing unit 221 and the second current processing unit 222 of two primary strings and secondary strings, and the midpoint of the filter capacitor of the power factor correction module 21 (i.e. the connection point of the first filter capacitor group C21 and the second filter capacitor group C22) is connected with the input midpoint of the current conversion module 22 of the rear stage, so that the voltage ripple of the filter capacitor of the power factor correction module 21 can be significantly reduced, the capacity of the filter capacitor of the power factor correction module can be reduced, and the power density can be improved.
In particular, the capacitance value of the first filter capacitor group C21 and the capacitance value of the second filter capacitor group C22 in the power factor correction unit 21 are equal, so that the current conversion module 22 can be simplified, and for example, the first current processing unit 221 and the second current processing unit 222 having the same parameters can be employed.
In one embodiment of the present invention, the pfc module 21 may include only one half bridge arm 211, and the midpoint of the half bridge arm 211 is connected to the first terminal (i.e. connected to the power line L) via a boost inductor L1. The structure is suitable for application with relatively small load power, and can reduce cost. Specifically, the number of half-bridge arms 211 in the pfc module 21 may be determined according to the load power, the performance parameters of the half-bridge arms 211 themselves, and the like.
Fig. 3 is a schematic diagram of a current conversion circuit according to another embodiment. In this embodiment, the current conversion circuit includes a power factor correction module 31 and a current conversion module 32, where the power factor correction module 31 is composed of a boost inductor L2, a half-bridge arm, a first filter capacitor bank C21 and a second filter capacitor bank C22, and the first current processing unit and the second current processing unit of the current conversion module 32 are respectively resonant converters, and perform voltage conversion (such as boost conversion or buck conversion) through the resonant converters.
Specifically, the half bridge arm of the present embodiment includes a first switching tube Q1 and a second switching tube Q2 (the first switching tube Q1 and the second switching tube Q2 may be a triode, a metal-oxide semiconductor field effect transistor, an insulated gate bipolar transistor, etc.) connected in series between a positive bus and a negative bus, and the midpoint of the half bridge arm is the connection point of the first switching tube Q1 and the second switching tube Q2.
The resonant converter comprises a chopping subunit, a passive network, a transformation subunit and a rectifying subunit, and the chopping subunit, the passive network, the transformation subunit and the rectifying subunit are sequentially connected between the input end and the output end of the resonant converter. Specifically, in the resonant converter constituting the first current processing unit, the chopper subunit is constituted by a third switching tube Q3, a fourth switching tube Q4, a fifth switching tube Q5, and a sixth switching tube Q6, and the third switching tube Q3, the fourth switching tube Q4, the fifth switching tube Q5, and the sixth switching tube Q6 are connected to form a full-bridge chopper circuit, and an output terminal of the full-bridge chopper circuit is connected to a primary side of the rectifier subunit T. The passive network comprises an oscillating capacitor Cr1 and an oscillating inductance Lr1, and the oscillating capacitor Cr1 and the oscillating inductance Lr1 are connected in series between the positive output terminal of the chopper subunit and the primary winding of the transformer subunit T1. The secondary side of the rectifier subunit T1 is connected to a rectifier subunit formed by a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4, and the output end of the rectifier subunit is connected to the output end of the current conversion module 32; in the resonant converter constituting the second current processing unit, the chopper subunit is constituted by a seventh switching tube Q7, an eighth switching tube Q8, a ninth switching tube Q9, and a tenth switching tube Q10, and the seventh switching tube Q7, the eighth switching tube Q8, the ninth switching tube Q9, and the tenth switching tube Q10 are connected to form a full-bridge chopper circuit, and an output terminal of the full-bridge chopper circuit is connected to a primary side of the rectifier subunit T2. The passive network comprises an oscillating capacitor Cr2 and an oscillating inductance Lr2, and the oscillating capacitor Cr2 and the oscillating inductance Lr2 are connected in series between the positive output terminal of the chopper subunit and the primary winding of the transformer subunit T2. The secondary side of the rectifying sub-unit T2 is connected to a rectifying sub-unit formed by a fifth diode D5, a sixth diode D6, a seventh diode D7 and an eighth diode D8, and the output terminal of the rectifying sub-unit is connected to the output terminal of the current conversion module 32.
In addition, the current transformation module 32 of the present embodiment may further include a third filter capacitor Co, a positive output terminal, and a negative output terminal, and connect the load through the positive output terminal and the negative output terminal, and the output ends of the first current processing unit and the second current processing unit are respectively connected to the positive output terminal and the negative output terminal, and the third filter capacitor Co is connected in series between the positive output terminal and the negative output terminal. The third filter capacitor Co can filter the output of the current conversion module 32 to ensure the quality of the output voltage.
Fig. 4 is a schematic waveform diagram of current transformation performed by the current transformation circuit according to the embodiment of the present invention. In fig. 4, the voltage across the first filter capacitor group C21, the voltage across the second filter capacitor group C22, the secondary winding current of the transformer subunit T1, and the secondary winding current of the transformer subunit T2 are sequentially from top to bottom. As can be seen from fig. 4, when the voltage across the first filter capacitor bank C21 of the pfc module 21 is higher than the voltage across the second filter capacitor bank C22, the first current processing unit 221 connected in parallel to the first filter capacitor bank C21 in the current conversion module 22 is in a power transmission state, and the second current processing unit 222 connected in parallel to the second filter capacitor bank C22 is in a power non-transmission state; when the voltage across the second filter capacitor group C22 is higher than the voltage across the first filter capacitor group C21, the second current processing unit 222 of the current transformation module 22 connected in parallel with the second filter capacitor group C22 is in a power transmission state, and the first current processing unit 221 connected in parallel with the first filter capacitor group C21 is in a power non-transmission state. That is, when the voltage across the first filter capacitor group C21 is high, the current conversion module 22 of the subsequent stage increases the output current of the first filter capacitor group C21, thereby suppressing the voltage across the first filter capacitor group C21 from rising; when the voltage of the second filter capacitor group C22 is high, the current transformation module 22 at the subsequent stage enlarges the output current of the second filter capacitor group C22, thereby inhibiting the voltage increase at both ends of the second filter capacitor group C22.
The waveform diagram of current conversion is compared with the conventional current conversion circuit (shown in fig. 1) with a power factor correction module as a front stage shown in fig. 5. In fig. 5, the voltages at the two ends of the two filter capacitor groups C11 and C12 in the PFC module 11 and the secondary winding currents of the transformers of the two converters in the dc conversion module 12 are sequentially from top to bottom. Under the same conditions, the maximum voltage difference between the voltages at two ends of the second filter resistor of the current transformation circuit according to the embodiment of the present invention is 86V (the maximum voltage difference between the voltages at two ends of the first filter resistor is the same), and the maximum voltage difference between the voltages at two ends of the second filter resistor of the existing current transformation circuit is 104V (the maximum voltage difference between the voltages at two ends of the first filter resistor is the same), that is, the current transformation circuit of the present embodiment can significantly reduce the voltage ripple of the filter capacitor of the power factor correction module 21.
The embodiment of the invention also provides a charging device, such as a vehicle-mounted charger, which comprises the current conversion circuit.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (8)
1. The current conversion circuit is characterized by comprising a power factor correction module and a current conversion module; wherein:
The power factor correction module comprises a first filter capacitor bank, a second filter capacitor bank, at least one half-bridge arm, a first terminal used for connecting a power grid live wire and a second terminal used for connecting a power grid zero line, wherein the first filter capacitor bank and the second filter capacitor bank are connected in series between a positive bus and a negative bus, two ends of the half-bridge arm are respectively connected to the positive bus and the negative bus, and the first terminal is connected to the middle point of the half-bridge arm; the second terminal is connected to an intermediate connection point, and the intermediate connection point is a connection point of the first filter capacitor group and the second filter capacitor group;
The current conversion module comprises a first current processing unit and a second current processing unit, wherein the output ends of the first current processing unit and the second current processing unit are connected in parallel, the input end of the first current processing unit is connected in series between the positive bus and the middle connecting point, and the input end of the second current processing unit is connected in series between the middle connecting point and the negative bus.
2. The current conversion circuit according to claim 1, wherein the power factor correction module includes a plurality of half-bridge legs, and a midpoint of each of the half-bridge legs is connected to the first terminal via an inductance, respectively.
3. The current conversion circuit according to claim 1, wherein each of the half-bridge legs includes a first switching tube and a second switching tube connected in series between the positive bus bar and the negative bus bar, and a midpoint of the half-bridge leg is a connection point of the first switching tube and the second switching tube.
4. The current transformation circuit of claim 1, wherein the first current processing unit and the second current processing unit are each resonant converters.
5. The current conversion circuit according to claim 4, wherein the resonant converter comprises a chopper subunit, a passive network, a transformer subunit, and a rectifier subunit, and wherein the chopper subunit, the passive network, the transformer subunit, and the rectifier subunit are connected in sequence between an input terminal and an output terminal of the resonant converter.
6. The current conversion circuit according to claim 1, wherein a capacitance value of the first filter capacitor group and a capacitance value of the second filter capacitor group are equal.
7. The current conversion circuit according to claim 1, wherein the current conversion module includes a third filter capacitor, a positive output terminal, and a negative output terminal, the outputs of the first and second current processing units are each connected to the positive and negative output terminals, and the third filter capacitor is connected in series between the positive and negative output terminals.
8. A charging device comprising a current conversion circuit as claimed in any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910727577.5A CN110474526B (en) | 2019-08-07 | 2019-08-07 | Current conversion circuit and charging device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910727577.5A CN110474526B (en) | 2019-08-07 | 2019-08-07 | Current conversion circuit and charging device |
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| CN110474526A CN110474526A (en) | 2019-11-19 |
| CN110474526B true CN110474526B (en) | 2024-08-02 |
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| CN206041839U (en) * | 2016-08-17 | 2017-03-22 | 国家电网公司 | Compact electric automobile module of charging |
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| CN210327378U (en) * | 2019-08-07 | 2020-04-14 | 苏州汇川联合动力系统有限公司 | Current conversion circuit and charging device |
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| CN102035364B (en) * | 2010-12-02 | 2013-08-21 | 成都芯源系统有限公司 | Bridgeless power factor correction converter and control method thereof |
| DE102011053622A1 (en) * | 2011-09-14 | 2013-03-14 | Finepower Gmbh | Power factor correction circuit for use as e.g. active power factor correction filter for reducing distributed harmonics in power supply device, has switching groups connected with each other in series by inter-connector |
| CN208174547U (en) * | 2018-04-25 | 2018-11-30 | 维谛公司 | A kind of two-way resonance DC-DC transfer circuit and uninterruptible power supply |
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2019
- 2019-08-07 CN CN201910727577.5A patent/CN110474526B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1447511A (en) * | 2003-03-20 | 2003-10-08 | 艾默生网络能源有限公司 | AC voltage control unit |
| CN101728961A (en) * | 2009-12-09 | 2010-06-09 | 艾默生网络能源有限公司 | AC/DC convertor |
| CN206041839U (en) * | 2016-08-17 | 2017-03-22 | 国家电网公司 | Compact electric automobile module of charging |
| CN108306497A (en) * | 2017-01-12 | 2018-07-20 | 沃尔缇夫能源系统公司 | A kind of multiphase interleaving controller and its control method |
| CN210327378U (en) * | 2019-08-07 | 2020-04-14 | 苏州汇川联合动力系统有限公司 | Current conversion circuit and charging device |
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Address after: 215000 52 tianedang Road, Yuexi Town, Wuzhong District, Suzhou City, Jiangsu Province Applicant after: Suzhou Huichuan United Power System Co.,Ltd. Address before: 215000 52 tianedang Road, Yuexi Town, Wuzhong District, Suzhou City, Jiangsu Province Applicant before: SUZHOU HUICHUAN UNITED POWER SYSTEM Co.,Ltd. |
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