CN113437872B - High-frequency auxiliary power supply based on multiple Buck circuits - Google Patents
High-frequency auxiliary power supply based on multiple Buck circuits Download PDFInfo
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- CN113437872B CN113437872B CN202110715292.7A CN202110715292A CN113437872B CN 113437872 B CN113437872 B CN 113437872B CN 202110715292 A CN202110715292 A CN 202110715292A CN 113437872 B CN113437872 B CN 113437872B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
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- 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)
Abstract
The invention provides a high-frequency auxiliary power supply based on a multiplex Buck circuit, which comprises a front-end multiplex Buck cascade circuit and a rear-end high-frequency DC/DC circuit, wherein the front-end multiplex Buck cascade circuit is composed of a plurality of Buck circuit sub-modules connected in series, and each Buck circuit sub-module comprises a plurality of half-bridge arms connected in parallel; the front-end multiple Buck cascade circuit realizes voltage division through serial Buck circuit submodules, realizes shunt through parallel connection of half-bridge arms, and provides a constant direct-current power supply for a rear-end high-frequency DC/DC circuit; the back end high frequency DC/DC circuit realizes the transmission and isolation of circuit energy through a high frequency transformer. The invention realizes the voltage division of high voltage through the series structure, realizes the parallel shunt of current through the parallel structure, can realize the wide-range operation conditions of input direct voltage and current, and ensures the universality and the high power density characteristic of the auxiliary unit.
Description
Technical Field
The invention relates to a high-frequency auxiliary power supply technology, in particular to a high-frequency auxiliary power supply based on a multiplex Buck circuit.
Background
In the application of power electronic technology and various power supply systems, the switching power supply technology is in the core position. For a large-scale electrolytic plating power supply, a traditional circuit is very large and heavy, if a high-pause switching power supply technology is adopted, the volume and the weight of the power supply can be greatly reduced, the utilization efficiency of the power supply can be greatly improved, materials are saved, and the cost is reduced. In electric vehicles and variable frequency transmission, the technology of a non-switching power supply is adopted, and the power frequency is changed through the switching power supply, so that load matching and driving control close to the ideal are achieved. The high-frequency switch power supply technology is the core technology of various high-power switch power supplies (inverter welding machines, communication power supplies, high-frequency heating power supplies, laser power supplies, electric power operation power supplies and the like). A high-frequency switching power supply (also referred to as a switching mode rectifier SMR) is a power supply that operates at high frequency by a MOSFET or an IGBT, and its switching frequency is generally controlled in a range of 50 to 100kHz, thereby achieving high efficiency and miniaturization. However, the traditional power frequency auxiliary power supply has the problems of large volume and low power density.
Disclosure of Invention
The invention aims to provide a high-frequency auxiliary power supply based on a multiple Buck circuit.
The technical solution for realizing the purpose of the invention is as follows: a high-frequency auxiliary power supply based on a multiplex Buck circuit comprises a front-end multiplex Buck cascade circuit and a back-end high-frequency DC/DC circuit, wherein:
the front-end multiple Buck cascade circuit is composed of a plurality of Buck circuit sub-modules which are connected in series, and each Buck circuit sub-module comprises a plurality of half-bridge arms which are connected in parallel; the front-end multiple Buck cascade circuit realizes voltage division through serial Buck circuit submodules, realizes shunt through parallel connection of half-bridge arms, and provides a constant direct-current power supply for a rear-end high-frequency DC/DC circuit; the back end high frequency DC/DC circuit realizes the transmission and isolation of circuit energy through a high frequency transformer.
Furthermore, each Buck circuit submodule consists of a capacitor, a resistor, N half-bridge arms, N filter inductors and an output inductor, wherein the capacitor, the resistor and the N half-bridge arms are connected in parallel, and the midpoint of each half-bridge arm is connected with the output inductor through one filter inductor; the Buck circuit submodule realizes stable regulation of output voltage by controlling the conduction period duty ratio of each phase of bridge arm device, and realizes current balance of each bridge arm through the filter inductor.
Furthermore, each half-bridge arm is composed of two switching tubes of anti-parallel diodes.
Furthermore, all Buck circuit submodules in the front-end multiple Buck cascade circuit are completely identical.
Further, based on the level requirements of the direct-current voltage on the input network side and the output power and the capacity of the device, the serial number of the modules and the parallel number of the bridge arms in the modules corresponding to the front-end Buck circuit are selected.
Furthermore, the back-end high-frequency DC/DC circuit adopts a double-active full-bridge bidirectional DC/DC converter.
Based on the control method of the high-frequency auxiliary power supply, constant direct-current bus voltage is provided for the rear-end high-frequency DC/DC circuit through the front-end multiple Buck cascade circuit, so that the soft switching characteristic of a full voltage range is realized, and stable output direct-current voltage is provided for the rear end.
Furthermore, the carrier phase shift angle of each bridge arm Buck circuit is set to be pi/2N, and the integral output current harmonic wave is reduced based on carrier multiplexing.
Further, based on ω s 2 The resonant frequency of a rear-end high-frequency DC/DC circuit is designed by Csls being 1, and when dead zones are considered, equivalent calculation resonance is correspondingly improved based on dead zone timeAnd frequency compensation of dead time is realized, wherein Cs is a resonant capacitor, Ls is a resonant inductor, and ω s is a resonant frequency.
Compared with the prior art, the invention has the following remarkable advantages: the high-voltage division is realized through the series structure, the current parallel shunt is realized through the parallel structure, the wide-range operation conditions of input direct-current voltage and current can be realized, and the universality and the high-power density characteristic of the auxiliary unit are ensured.
Drawings
FIG. 1 is a topological diagram of a high-frequency auxiliary power supply based on a multiple Buck circuit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application.
The high-frequency auxiliary power supply based on the multiple Buck circuits comprises a front-end multiple Buck cascade circuit and a rear-end high-frequency DC/DC circuit. The front-end multiple Buck cascade circuits realize voltage division through series connection, realize shunt through parallel connection and provide a constant direct-current power supply for the rear-end high-frequency DC/DC circuit; the rear-end high-frequency DC/DC circuit realizes the transmission and isolation of circuit energy through a high-frequency transformer.
As shown in the left side of fig. 1, the front-end multiple Buck cascade circuit is composed of 2 Buck circuit sub-modules connected in series, which are respectively a first Buck circuit sub-module and a second Buck circuit sub-module, where the first Buck circuit sub-module includes a first capacitor C1, a first resistor R1, N half-bridge arms, N filter inductors, and a first output inductor L1, each half-bridge arm is composed of switching tubes (T11, T12, T13, T14, T15, T16, etc.) of two inverse parallel diodes (D11, D12, D13, D14, D15, V16, etc.), the first capacitor C1 and the first resistor R1 are connected in parallel with the N half-bridge arms, and midpoints of the half-bridge arms are respectively connected with the output inductors through one filter inductor. For example, switching tubes T11 and T14 form a first bridge arm, the connection point of the two switching tubes is connected with a first output inductor L1 through a filter inductor L11, the second Buck circuit submodule includes a second capacitor C2, a second resistor R2, N half-bridge arms, N filter inductors, and a second output inductor L2, each half-bridge arm is composed of switching tubes (T21, T22, T23, T24, T25, T26, etc.) of two antiparallel diodes (D21, D22, D23, D24, D25, V26, etc.), the second capacitor C2 and the second resistor R2 are connected in parallel with the N half-bridge arms, and the midpoint of each half-bridge arm is connected with the output inductor through one filter inductor. For example, the switching tubes T21 and T24 form a first bridge arm, and the connection point of the two switching tubes is connected to the second output inductor L2 through the filter inductor L21.
As shown in the right side of FIG. 1, the back-end high-frequency DC/DC circuit adopts a double-active full-bridge bidirectional DC/DC converter, and consists of switching tubes T1, T2, T3, T4, D1, D2, D3, D4, D5, D6, D7, D8, Cs, Ls and C4 and a high-frequency transformer. The front end multiple Buck cascade power supply L1 and L2 provide constant direct current power supply to the rear end high-frequency DC/DC circuit through a capacitor C3 and a resistor R3.
As a specific implementation, based on the requirements for the dc bus voltage and the filter inductor current ripple, the adaptive capacitance and inductance values are selected, and the appropriate switching frequency is designed. The filter inductance values are respectively L11, L12, … …, L1N, L21, L22, … … and L2N in the figure, the inductance values are generally selected according to the symmetry, the supporting capacitance value corresponds to C3, the larger the inductance value and the capacitance is, the smaller the voltage and current ripples are, the higher the switching frequency is, the smaller the ripples are, the selection of the switching frequency is related to the requirements of the ripples and the switching loss of the device, and comprehensive consideration is needed.
A constant direct-current bus voltage is provided for a rear-end high-frequency DC/DC circuit through a front-end multiple Buck cascade circuit, so that the soft switching characteristic of a full voltage range is realized, and stable output direct-current voltage is provided for a rear-end auxiliary inverter and a charger.
As a specific implementation mode, the method sets the carrier phase shift angle of each bridge arm Buck circuit to be pi/2N, and reduces the integral output current harmonic wave based on the carrier multiplexing.
As a specific embodiment, the method is based on ω s 2 CsLs is 1 the design resonant frequency,when considering dead zone, the equivalent calculation resonant frequency is correspondingly improved based on different dead zone times, so that dead zone time compensation is realized, wherein Cs is resonant capacitance, Ls is resonant inductance, and ω s is resonant frequency.
As a specific implementation mode, when the load changes dynamically, the method ensures the stable output of the direct current bus voltage at the two ends of the rear diode uncontrolled rectifying circuit C4 by adjusting the capacitor voltage at the output end C3 of the front-end multiple Buck cascade circuit in real time. For example, when the output voltage of the dc bus voltage across the diode-uncontrolled rectifying circuit C4 decreases with the increase of the load capacity, the output voltage is stabilized by raising the voltage of the front-end C3 capacitor.
In summary, the invention can realize stable regulation of output voltage by controlling the on-period duty ratio of each phase of bridge arm device, and realize current balance of each bridge arm through the filter inductor Lij, thereby ensuring stable output of the capacitor voltage of the output end C3 of the multiple Buck circuit, and providing a constant direct current power supply for the rear-end high-frequency DC/DC circuit; by each module filter inductance Li (1,2), the circulation current suppression between the modules can be realized, thereby eliminating the inconsistency of the control circuit modules. The soft switching characteristic under the full-time-domain working condition is realized by selecting proper resonant capacitors and inductance values in the high-frequency isolation DC/DC circuit, and the final energy transfer and isolation of the circuit are realized through a high-frequency transformer.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (6)
1. High frequency auxiliary power supply based on multiple Buck circuit, its characterized in that includes the multiple Buck cascade circuit of front end and rear end high frequency DC/DC circuit, wherein:
the front-end multiple Buck cascade circuit is composed of a plurality of Buck circuit sub-modules which are connected in series, and each Buck circuit sub-module comprises a plurality of half-bridge arms which are connected in parallel; the front-end multiple Buck cascade circuit realizes voltage division through serial Buck circuit submodules, realizes shunt through parallel connection of half-bridge arms, and provides a constant direct-current power supply for a rear-end high-frequency DC/DC circuit; the rear-end high-frequency DC/DC circuit realizes the transmission and isolation of circuit energy through a high-frequency transformer;
each Buck circuit submodule consists of a capacitor, a resistor, N half-bridge arms, N filter inductors and an output inductor, wherein the capacitor, the resistor and the N half-bridge arms are connected in parallel, and the midpoint of each half-bridge arm is connected with the output inductor through one filter inductor; the Buck circuit submodule realizes stable regulation of output voltage by controlling the conduction period duty ratio of each phase of bridge arm device and realizes current balance of each bridge arm through a filter inductor; each half-bridge arm consists of two switching tubes of reverse parallel diodes; the back-end high-frequency DC/DC circuit adopts a double-active full-bridge bidirectional DC/DC converter.
2. The multiplexed Buck circuit-based high-frequency auxiliary power supply according to claim 1, wherein each Buck circuit submodule in the front-end multiple Buck cascade circuit is identical.
3. The multiple Buck circuit-based high-frequency auxiliary power supply according to claim 1, wherein the number of serial modules and the number of parallel bridges in each module corresponding to the front-end Buck circuit are selected based on the DC voltage at the input network side, the level requirement of output power and the capacity of devices.
4. The multiple Buck circuit-based high-frequency auxiliary power supply according to any one of claims 1-3, wherein a constant direct-current bus voltage is provided for the back-end high-frequency DC/DC circuit through the front-end multiple Buck cascade circuit, so that a soft switching characteristic in a full voltage range is realized, and a stable output direct-current voltage is provided for the back end.
5. The multiple Buck circuit-based high-frequency auxiliary power supply according to claim 4, wherein a carrier phase shift angle of each bridge arm Buck circuit is set to be pi/2N, and overall output current harmonics are reduced based on carrier multiplexing.
6. The multiple Buck circuit-based high-frequency auxiliary power supply according to claim 4, wherein the Buck circuit-based high-frequency auxiliary power supply is based on ω s 2 When considering dead zone, CsLs designs the resonant frequency of the rear-end high-frequency DC/DC circuit as 1, and when considering the dead zone, the equivalent calculation resonant frequency is correspondingly improved based on the dead zone time, so that dead zone time compensation is realized, wherein Cs is a resonant capacitor, Ls is a resonant inductor, and ω s is the resonant frequency.
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| CN202110715292.7A CN113437872B (en) | 2021-06-26 | 2021-06-26 | High-frequency auxiliary power supply based on multiple Buck circuits |
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| CN100384072C (en) * | 2004-07-01 | 2008-04-23 | 南京航空航天大学 | Double output double step-down type half bridge inverter, and control and modulation method |
| CN106026274B (en) * | 2016-06-30 | 2019-03-05 | 武汉中直电气股份有限公司 | A kind of high-power charging circuit and device |
| US10620654B2 (en) * | 2016-08-31 | 2020-04-14 | Delta Electronics (Shanghai) Co., Ltd | Alternatingly-switched parallel circuit, integrated power module and integrated power package |
| CN107947575A (en) * | 2017-12-14 | 2018-04-20 | 东北电力大学 | Modularization can the double Buck tandem cell charger main circuit topologies of connection in series-parallel |
| CN108667058A (en) * | 2018-07-24 | 2018-10-16 | 合肥工业大学 | A kind of system for chain type energy storage structure that can eliminate secondary pulsation |
| CN111092551A (en) * | 2019-12-30 | 2020-05-01 | 杭州意能电力技术有限公司 | Module cascade high-voltage direct-current chopper |
| CN111342664A (en) * | 2020-02-24 | 2020-06-26 | 华中科技大学 | Integrated DC-DC converter and control method thereof |
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