CN112165255A - Control method suitable for interleaved parallel Boost circuit - Google Patents
Control method suitable for interleaved parallel Boost circuit Download PDFInfo
- Publication number
- CN112165255A CN112165255A CN202011032106.1A CN202011032106A CN112165255A CN 112165255 A CN112165255 A CN 112165255A CN 202011032106 A CN202011032106 A CN 202011032106A CN 112165255 A CN112165255 A CN 112165255A
- Authority
- CN
- China
- Prior art keywords
- input
- current
- control method
- voltage
- phase
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—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
- H02M3/02—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
- H02M3/1586—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 switched with a phase shift, i.e. interleaved
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a control method suitable for a staggered parallel Boost circuit, which is applied to a bidirectional high-voltage DC-DC circuit formed by connecting n-phase Boost topologies in parallel and comprises a high-voltage battery, an input capacitor, an output capacitor, n relay switches and a three-phase bridge formed by IGBTs; the method comprises the following steps: calculating load power in real time through a software program; estimating the magnitude of the input current through energy conservation and efficiency; comparing the estimated input current with a set current threshold, wherein the current threshold is set according to the power grade and is reserved with a preset allowance, and different current thresholds are correspondingly input to different bridge arm numbers; and when the estimated input current is within the current threshold range, controlling the relay switches to be closed by corresponding amount through software, and controlling the amount of the input bridge arms. The problem that the number of input bridge arms is not appropriate under different power levels and the system loss is increased is effectively solved, and the efficiency optimization of the system under different power levels is facilitated.
Description
Technical Field
The invention belongs to the technical field of vehicle-mounted high-power high-voltage DC-DC module control of an electric driving system of an electric vehicle, and relates to a control method suitable for a staggered parallel Boost circuit.
Background
The vehicle-mounted high-power high-voltage DC-DC module becomes an important component of the electric automobile more and more, and is the key for realizing more flexible acceleration, deceleration, energy recovery and other functions of the electric automobile. The staggered parallel Boost circuit topology can flexibly realize the function of bidirectional DC-DC, so that the staggered parallel Boost circuit topology is applied to a vehicle-mounted high-power high-voltage DC-DC module of an electric vehicle at present, most three-phase staggered parallel Boost topologies are applied at present, and most three-phase bridge arms are used, so that the control mode can cause too many bridge arms to be used under a low-power working condition, and the circuit loss is increased. Therefore, when the system is in a low-power working condition, because the number of the input bridge arms is n, the loss of the inductor and the loss of the switching device are n times of that of a single bridge arm, and the system efficiency of the system under the low-power working condition is seriously reduced.
Disclosure of Invention
The invention aims to: the control method is suitable for the interleaved parallel Boost circuit, the load current is calculated in real time and is compared with a set current threshold, the relay action is controlled according to the judgment result, and the number of working bridge arms is reasonably put into operation, so that the system loss of the system under the low-power working condition is reduced, and the system efficiency is improved.
The technical scheme of the invention is as follows: a control method suitable for an interleaved parallel Boost circuit is applied to a bidirectional high-voltage DC-DC circuit formed by connecting n-phase Boost topologies in parallel, wherein the bidirectional high-voltage DC-DC circuit comprises a high-voltage battery, an input capacitor, an output capacitor, n relay switches and a three-phase bridge formed by IGBTs; the control method comprises the following steps:
step 2, estimating the magnitude of the input current through energy conservation and efficiency;
and 4, when the estimated input current is within the current threshold range, controlling the relay switches to be closed by corresponding amount through software, thereby controlling the amount of the input bridge arms.
The further technical scheme is as follows: the estimation formula of the input current in the step 2 comprises:
wherein, P0、P1、P2Respectively representing the input power, output power and load power, U, of the high voltage DC-DCinRepresents the input voltage, IinRepresenting input current, η1And η2Respectively representing the system efficiency and the load side efficiency of the high voltage DC-DC.
The further technical scheme is as follows: the step 4 comprises the following steps:
when I isin＜C*IMAXThen, putting a phase bridge arm;
when C is (n-1) IMAX＜Iin＜C*n*IMAXThen, putting n-phase bridge arms;
wherein n is an integer greater than 1, IMAXThe maximum withstand current of each arm is shown, and C is a margin.
The further technical scheme is as follows: the value of the allowance is 10-20%.
The invention has the advantages that:
the quantity of bridge arms input by the system is determined by judging the magnitude relation between the input current and the set threshold value and controlling the action of the relay, so that the problem that the quantity of the bridge arms input by the system is not appropriate under different power levels and the system loss is increased is effectively solved, the efficiency optimization of the system under different power levels is facilitated, and the problem that the loss is increased due to the fact that too many bridge arms are input when the topology of the staggered parallel Boost circuit is under a low-power working condition, and the system efficiency is reduced under the low-power working condition is solved.
Drawings
The invention is further described with reference to the following figures and examples:
FIG. 1 is a circuit topology diagram of a high-voltage DC-DC unit of an electric automobile;
FIG. 2 is a circuit topology when a phase leg is put in;
FIG. 3 is a circuit topology when two phase legs are put in;
FIG. 4 is a circuit topology when three phase legs are engaged;
fig. 5 is a schematic diagram of input bridge arm calculation and control flow of the control method suitable for the interleaved parallel Boost circuit provided by the present application.
Detailed Description
Example (b): the application provides a control method suitable for a staggered parallel Boost circuit, which is applied to a bidirectional high-voltage DC-DC circuit formed by connecting n-phase Boost topologies in parallel by combining with reference to fig. 1 to 5, as shown in fig. 1, the control method shows a high-voltage DC-DC unit circuit topology of an electric vehicle, and the circuit topology is formed by connecting n-phase Boost topologies in parallel, so that the function of the bidirectional high-voltage DC-DC circuit can be realized, and the topology can be reused as a single-phase or three-phase alternating-current vehicle-mounted charger in principle, so that the function of charging a battery can be realized. The bidirectional high-voltage DC-DC circuit comprises a high-voltage battery and an input capacitor C1An output capacitor C2N relay Switches (SH)1SH2 and SH3, to SHn) and a three-phase bridge consisting of IGBTs.
For the topology of the parallel Boost circuit, there can be various ways of single-phase, two-phase and multi-phase parallel connection, as can be seen from fig. 1, each phase of bridge arm has the same inductance and switching device, so that the inductance and switching device will generate loss when each phase works, taking the three-phase parallel Boost circuit in fig. 1 as an example, when n phase of bridge arms are put into work simultaneously, the loss equivalent to the circuit is n times of that when a single phase is put into work, especially when a small power is output, the system loss occupation ratio is large, and the efficiency is low. Therefore, in order to reduce the system loss of the system under the low-power working condition, the number of the working bridge arms is controlled by controlling the relay switches under different power levels, and the purposes of reducing the loss and improving the efficiency are achieved. Taking a three-phase staggered parallel topology as an example, fig. 2, 3, and 4 are topological diagrams when a one-phase bridge arm, a two-phase bridge arm, and a three-phase bridge arm are put in, respectively.
The control method comprises the following steps:
And 2, estimating the magnitude of the input current through energy conservation and efficiency.
In order to reduce the input current sensor, when the circuit works normally, the load power is calculated in real time through software, and the input current is estimated through energy conservation and efficiency.
Wherein, the estimation formula of the input current in the step 2 comprises:
wherein, P0、P1、P2Respectively representing the input power, output power and load power, U, of the high voltage DC-DCinRepresents the input voltage, IinRepresenting input current, η1And η2Respectively representing the system efficiency and the load side (inverter bridge) efficiency of the high voltage DC-DC.
And 3, comparing the estimated input current with a set current threshold, wherein the current threshold is set according to the power grade and leaves a preset allowance, and different current thresholds are correspondingly input into different bridge arm numbers.
After the input current Iin is obtained through calculation of the formula (4), the input current Iin is compared with a corresponding current judgment threshold value, the number of the closed relay switches is controlled according to the judgment result, and therefore the number of the bridge arms which are put into operation is determined. The schematic diagram of the calculation control flow of the input bridge arm is shown in fig. 5.
And 4, when the estimated input current is within the current threshold range, controlling the relay switches to be closed by corresponding amount through software, thereby controlling the amount of the input bridge arms.
The relationship between the input current and the number of input bridge arms is as follows:
when I isin＜C*IMAXThen, putting a phase bridge arm;
when C is (n-1) IMAX＜Iin＜C*n*IMAXThen, putting n-phase bridge arms; for example, when C is IMAX＜Iin＜C*2IMAXWhen two bridge arms are put in, when C is 2IMAX＜Iin＜C*3IMAXAnd then, three-phase bridge arms are put into the reactor.
N is an integer greater than 1, the current threshold is determined as a certain allowance of the maximum current which can be borne by each phase of bridge arm IGBT module, and the maximum borne current of each bridge arm is set to be the same as IMAXWherein C is margin and is generally selected to be 10-20% according to actual conditions.
In summary, the control method for the staggered parallel Boost circuit provided by the application determines the number of the bridge arms input into the system by judging the magnitude relation between the input current and the set threshold value, effectively avoids the problems that the number of the bridge arms input into the system is not proper under different power levels and the system loss is increased, is beneficial to realizing the efficiency optimization of the system efficiency under different power levels, and solves the problems that when the topology of the staggered parallel Boost circuit is under the low-power working condition, the loss is increased due to the fact that too many bridge arms are input, and further the system efficiency under the low-power working condition is reduced.
The terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying a number of the indicated technical features. Thus, a defined feature of "first", "second", may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
The above-mentioned serial numbers of the embodiments of the present application are merely for description and do not represent the merits of the embodiments.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk, an optical disk, or the like.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (4)
1. A control method suitable for an interleaved parallel Boost circuit is characterized by being applied to a bidirectional high-voltage DC-DC circuit formed by connecting n-phase Boost topologies in parallel, wherein the bidirectional high-voltage DC-DC circuit comprises a high-voltage battery, an input capacitor, an output capacitor, n relay switches and a three-phase bridge formed by IGBTs; the control method comprises the following steps:
step 1, calculating load power in real time through a software program;
step 2, estimating the magnitude of the input current through energy conservation and efficiency;
step 3, comparing the estimated input current with a set current threshold, wherein the current threshold is set according to the power grade and is reserved with a preset allowance, and different current thresholds are correspondingly input to different bridge arm numbers;
and 4, when the estimated input current is within the current threshold range, controlling the relay switches to be closed by corresponding amount through software, thereby controlling the amount of the input bridge arms.
2. The control method for the interleaved parallel Boost circuit according to claim 1, wherein the estimation formula of the input current in step 2 comprises:
wherein, P0、P1、P2Respectively representing the input power, output power and load power, U, of the high voltage DC-DCinRepresents the input voltage, IinRepresenting input current, η1And η2Respectively representing the system efficiency and the load side efficiency of the high voltage DC-DC.
3. The control method for the interleaved parallel Boost circuit according to claim 2, wherein the step 4 comprises:
when I isin＜C*IMAXThen put into the one-phase bridge arm；
When C is (n-1) IMAX＜Iin＜C*n*IMAXThen, putting n-phase bridge arms;
wherein n is an integer greater than 1, IMAXThe maximum withstand current of each arm is shown, and C is a margin.
4. The control method for the interleaved parallel Boost circuit according to any of claims 1 to 3, wherein the margin value is between 10% and 20%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011032106.1A CN112165255A (en) | 2020-09-27 | 2020-09-27 | Control method suitable for interleaved parallel Boost circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011032106.1A CN112165255A (en) | 2020-09-27 | 2020-09-27 | Control method suitable for interleaved parallel Boost circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112165255A true CN112165255A (en) | 2021-01-01 |
Family
ID=73862990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011032106.1A Pending CN112165255A (en) | 2020-09-27 | 2020-09-27 | Control method suitable for interleaved parallel Boost circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112165255A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114244086A (en) * | 2021-12-23 | 2022-03-25 | 珠海格力电器股份有限公司 | Power control circuit and method, energy router, photovoltaic equipment and energy storage equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767380A (en) * | 2015-04-15 | 2015-07-08 | 扬州大学 | Automobile direct current-direct current converter circuit and control method thereof |
| EP3454463A1 (en) * | 2017-09-11 | 2019-03-13 | Valeo Systemes de Controle Moteur | Voltage converter embedded in an automobile vehicle and associated precharge device |
| CN111316550A (en) * | 2017-09-11 | 2020-06-19 | 法雷奥电机控制系统公司 | Voltage converter and associated charger on a motor vehicle |
-
2020
- 2020-09-27 CN CN202011032106.1A patent/CN112165255A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767380A (en) * | 2015-04-15 | 2015-07-08 | 扬州大学 | Automobile direct current-direct current converter circuit and control method thereof |
| EP3454463A1 (en) * | 2017-09-11 | 2019-03-13 | Valeo Systemes de Controle Moteur | Voltage converter embedded in an automobile vehicle and associated precharge device |
| CN111316550A (en) * | 2017-09-11 | 2020-06-19 | 法雷奥电机控制系统公司 | Voltage converter and associated charger on a motor vehicle |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114244086A (en) * | 2021-12-23 | 2022-03-25 | 珠海格力电器股份有限公司 | Power control circuit and method, energy router, photovoltaic equipment and energy storage equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110783942B (en) | Fault current-limiting control method and system for MMC type flexible direct-current power grid | |
| Curti et al. | A simplified power management strategy for a supercapacitor/battery Hybrid Energy Storage System using the Half-Controlled Converter | |
| CN112234839B (en) | Hybrid distribution transformer and power-on soft start method thereof | |
| CN112448652B (en) | Two-stage type staggered parallel electric drive controller and control method thereof | |
| CN108462381A (en) | A kind of half-bridge three-level converter and its soft-start method | |
| CN114475362B (en) | Electric vehicle and drive control system thereof | |
| Rahman et al. | Performance enhancement of a bi-directional DC-DC converter using a Ćuk converter for electric vehicle applications | |
| CN109830943B (en) | Flexible direct-current power grid fault current-limiting control system, method and application | |
| CN114175481A (en) | DC-DC converter of power conversion system | |
| CN112165255A (en) | Control method suitable for interleaved parallel Boost circuit | |
| US11451137B2 (en) | Method for pre-charging a cascade converter and cascade converter | |
| CN108462197B (en) | Starting control method and device for flexible direct-current transmission converter valve | |
| CN111313385B (en) | Front acceleration protection method for direct current power distribution network | |
| Amin et al. | A three-phase high frequency semi-controlled battery charging power converter for plug-in hybrid electric vehicles | |
| CN114400750B (en) | Single-phase two-stage integrated charging system based on nine-winding motor | |
| CN115549028A (en) | Series hybrid circuit breaker based on double-coupling inductor | |
| CN115549161A (en) | Design and control method of electric vehicle charging station for improving electric energy quality | |
| Itani et al. | Control strategy for extreme conditions regenerative braking of a hybrid energy storage system for an electric vehicle | |
| CN112436724B (en) | Current conversion device and assembly thereof, reactive power compensation device, current converter and control method thereof | |
| Sack et al. | Dimensioning of the Z-source inverter for general purpose drives with three-phase standard motors | |
| CN113965097A (en) | Transient voltage supported V2G main circuit topological structure | |
| CN114362521B (en) | Control method of buck-boost hybrid circuit with wide-range multi-mode output | |
| Attaianese et al. | High performances supercapacitor recovery system including Power Factor Correction (PFC) for elevators | |
| Pellitteri et al. | A comparison of different DC-DC converters for energy storage management in nearly-Zero Energy Buildings | |
| CN114301273B (en) | Slow start circuit compatible with single-phase two-phase three-phase power and control method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210101 |
|
| RJ01 | Rejection of invention patent application after publication |