CN101626196A - Control method for improving efficiency of two-stage current transformer - Google Patents
Control method for improving efficiency of two-stage current transformer Download PDFInfo
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- CN101626196A CN101626196A CN200910115917A CN200910115917A CN101626196A CN 101626196 A CN101626196 A CN 101626196A CN 200910115917 A CN200910115917 A CN 200910115917A CN 200910115917 A CN200910115917 A CN 200910115917A CN 101626196 A CN101626196 A CN 101626196A
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Abstract
The invention relates to a control method for improving the efficiency of a two-stage current transformer, which is characterized in that the reference value Uref of the mid bus voltage of the output voltage of a forestage current transformer is regulated and used as a control voltage, and a control circuit of the forestage current transformer is used for controlling the output voltage Ubus of the forestage current transformer to reach the reference value Uref of the mid bus voltage. The invention uses the control method for improving efficiency is based on the initial mid bus voltage Ubus , the reference value Uref of the mid bus voltage and initial efficiency Eta1 to give Uref +DeltaU (DeltaU>0) to Uref so as to regulate the mid bus voltage U bus, the regulated efficiency Eta 2 is checked to judge whether Eta 2 is more than or less than the initial efficiency Eta1, a direction with increased efficiency is used for deciding whether to give U ref +DeltaU to Uref or give Uref-DeltaU to U ref so as to regulate the mid bus voltage U bus until the two-stage current transformer obtains the best efficiency within the range of certain mid AC bus voltage, and thus, the aim of obtaining the best efficiency in different working situations is achieved.
Description
Technical field
The present invention relates to a kind of control method that improves two-stage current transformer system works efficient, be particularly suitable for inputing or outputing the current transformer that the voltage wide region changes.
Background technology
In energy problem extremely valued today, improve the important directions that utilization efficiency of energy becomes scientific research.Based on the high-frequency current transformer of modern power electronic because than traditional linear power supply have the efficient height, advantage that volume is little has obtained going deep into extensive studies and has used.
High-frequency current transformer can convert a kind of interchange or direct voltage to another kind of the interchange or direct voltage.Its topology is various informative, divides according to its connecting structure, have two kinds more commonly used: a kind of is the single-stage converter structure, and it directly converts input AC or direct voltage to output AC or direct voltage; Also having a kind of then is the two-stage series connection converter structure, and it is normally earlier with input AC or direct voltage U
InConvert an intermediate dc busbar voltage U to through the preceding stage high frequency current transformer
Bus, again by back level high-frequency current transformer with this intermediate dc busbar voltage U
BusConvert output AC or direct voltage U to
o, as shown in Figure 1.Certainly, also have multistage and other structures such as multiple connection.
The current transformer of two-stage series connection (abbreviation two-stage current transformer) structure applications is a lot, as in vehicle-mounted and boat-carrying inverter, because the lead acid accumulator voltagerating is 12VDC or 24VDC, just need with a high-frequency isolation booster circuit (as recommending DC-DC current transformer or full-bridge DC-DC current transformer) usually earlier with this low pressure U
InBe elevated to the dc bus high pressure U of about 400V
Bus, again by back level full bridge inverter with this dc bus high pressure U
BusBe reverse into the alternating voltage U of 220VAC
oAlso have in the communication rectification module, prime normally will be imported line voltage U by a boosting power factor correction circuit
InRaise into a high direct voltage U about 400V
Bus, by the isolation type high frequency current transformer (as normal shock DC-DC current transformer or full-bridge DC-DC current transformer etc.) of back level this high pressure is converted to the voltage U of 48VDC again
oThe example of this respect is a lot.
The input voltage of two-stage current transformer often is not stable voltage, is 10VDC～15VDC as single-unit lead acid accumulator voltage range, and the fluctuation range of line voltage then can widely reach 176VAC～267VAC.The prime current transformer of traditional two-stage current transformer is designed to this unsettled voltage U
InConvert a galvanic current to and press U
BusAnd wide like this, even under the wideer input voltage, the design of prime current transformer is difficult to accomplish efficiency optimization, has also influenced overall system efficiency simultaneously.In addition, for the two-stage current transformer of Adjustable Output Voltage, if adopt fixedly intermediate-bus voltage U
BusControl method, then brought back level current transformer working point to optimize, reduce system effectiveness.
Summary of the invention:
Main purpose of the present invention provides a kind of control method for improving efficiency of two-stage current transformer, and it can adjust intermediate dc busbar voltage U by the control method that proposes in the circuit running
Bus, make system works in the optimization efficiency working point.
The objective of the invention is to be achieved through the following technical solutions:
A kind of control method for improving efficiency of two-stage current transformer.The prime current transformer of two-stage current transformer is with input voltage U
InConvert an intermediate dc busbar voltage U to
Bus, back level current transformer is again with this intermediate dc busbar voltage U
BusConvert the output voltage U of expection to
oTesting circuit detects the voltage and current signal of two-stage current transformer.Improving efficiency control algolithm and circuit are accepted the signal of testing circuit, carry out the efficient adjustment and calculate, and constantly adjust output intermediate-bus voltage reference value U according to result of calculation
Ref, up to system at certain intermediate-bus voltage U
BusAllow to obtain in the adjustable range optimum working efficiency.Output intermediate-bus voltage reference value U
RefThe control circuit that is used for the prime current transformer, the control circuit of prime current transformer should be able to guarantee its output intermediate-bus voltage U
BusCan follow reference value U
RefAnd change.
The prime current transformer of two-stage current transformer of the present invention can be the not isolated or high-frequency isolation formula DC-DC or the AC-DC current transformer of various single-stages; The back level current transformer of this two-stage current transformer can be not isolated or high-frequency isolation formula DC-DC or DC-AC current transformers of various single-stages.
Testing circuit of the present invention is provided with two-stage current transformer input voltage u
In, input current i
In, output voltage u
o, output current i
oWith intermediate-bus voltage u
BusTesting circuit.
Improving efficiency control algolithm and circuit thereof are accepted each signal that testing circuit is sent here, by producing new intermediate-bus voltage reference value U behind the algorithm
Ref, again this reference value is given the control circuit of prime current transformer, treat that the adjustment of prime current transformer detects after stable again to handle each signal, so constantly adjust up at new intermediate-bus voltage U
BusThere is best efficient in following system.Algorithm need multiply each other according to input voltage and input current and calculate input power P
In, multiplying each other according to output voltage and output current obtains power output P
Out, the efficiency eta=P of computing system again
Out/ P
In
Referring to accompanying drawing 2, concrete control flow of the present invention is following steps successively:
When the system stability state, according to initial intermediate-bus voltage reference value U
RefCalculate corresponding efficiency eta with measurement
1, determine disturbance quantity Δ U (greater than zero).Then with U
Ref+ Δ U give U
Ref, as new busbar voltage reference value.Treat busbar voltage U
BusBe stabilized to U
RefThe time, measure the efficiency eta that calculates under the new stable case
2Judge this efficiency eta
2Whether greater than η
1, and with η
2Give η
1If efficient has improved, then enter flow process (1); Otherwise just enter flow process (2).
Flow process (1)-continuation increases the intermediate-bus voltage reference value with U
Ref+ Δ U give U
Ref, and judge that whether this new reference value is greater than maximum reference voltage U
Ref_maxIf yes is then with U
Ref-Δ U give U
RefAs end value output and end; If no treats that then prime current transformer control makes intermediate-bus voltage U
BusBe stabilized to U
RefAfter efficiency of measurement η again
2, judging efficiency η
2Whether greater than η
1, and with η
2Give η
1If improved efficiency then turns back to the place that flow process (1) begins; If decrease in efficiency is then with U
Ref-Δ U give U
RefAs end value output and end.
Flow process (2)-reduce the reference value of intermediate-bus voltage with U
Ref-Δ U give U
Ref, and judge that whether this reference value is less than minimum reference voltage U
Ref_minIf yes is then with U
Ref+ Δ U give U
RefAs end value output and end; If no treats that then prime current transformer control makes intermediate-bus voltage U
BusBe stabilized to U
RefAfter efficiency of measurement η again
2, judging efficiency η
2Whether greater than η
1, and with η
2Give η
1If improved efficiency then turns back to the place that flow process (2) begins; If decrease in efficiency is then with U
Ref+ Δ U give U
RefAs end value output and end.
This initial intermediate-bus voltage reference value U
RefBy system according to the conventional method setting;
This disturbance voltage Δ U can be a changing value greater than zero.
Technique effect of the present invention is: the intermediate dc bus voltage value U of traditional two-stage current transformer
BusBe designed to fix, this make prime current transformer power tube when the input voltage wide region changes the control signal duty ratio also wide region change, also wide region variation of the control signal duty ratio of level current transformer power tube when the output voltage wide region changes behind the latter, the problem that this has brought efficient to optimize.And adopt control method for improving efficiency of the present invention to adjust intermediate dc busbar voltage U by algorithm
Bus, the duty ratio working point of level current transformer before and after just regulating, this makes two-stage current transformer obtain best duty ratio working point in certain intermediate dc busbar voltage scope, reaches the effect that obtains optimum efficiency under different operating modes.
Description of drawings:
Fig. 1 is traditional two-stage current transformer system architecture diagram;
Fig. 2 is the flow chart of control method for improving efficiency;
Fig. 3 is a specific embodiment of the present invention;
Embodiment:
The present invention is described in further detail below in conjunction with a specific embodiment of accompanying drawing 3.
Referring to Fig. 3, it is a vehicle-mounted inverter that has adopted control method for improving efficiency of the present invention.Circuit mainly consists of the following components: 1 12VDC lead-acid batteries; 2 push-pull type DC converter; 3 full bridge inverters; 4 isolated drive circuits-1; 5 isolated drive circuits-2; 6 TMS320C2812 processors; 7 detect and change-over circuit;
Described 1 12VDC lead-acid batteries voltage U
InThe permission excursion is 10VDC～15VDC;
Power tube Q in the described 2 push-pull type DC converter
1And Q
2Adopted 5 IRF3205 parallel connections, the former secondary no-load voltage ratio of transformer is 2: 72, diode D
1～D
4Adopted RHRP8120.Inductance L
sBe 1mH.The contactor frequency is 30kHz.The intermediate bus bar capacitor C
BusBe 1000uF/500VDC, the permission excursion of intermediate-bus voltage is 340VDC～480VDC.
The power tube Q of described 3 full bridge inverters
3～Q
6Adopt IRG4PC50UD, filter inductance L
fBe 2mH, filter capacitor C
fBe 6.8uF.Switching frequency is 18kHz.Rated output voltage U
oBe 220VAC.
The input of described 4 isolated drive circuits-1 is PWM1 and the PMW2 signal that the TMS320C2812 processor produces, and output drives power tube Q in the push-pull type DC converter respectively
1And Q
2
The input of described 5 isolated drive circuits-2 is PWM3 that the TMS320C2812 processor produces, PWM4, and PWM5 and PWM6 signal, output drives the power tube Q of full bridge inverter respectively
3, Q
4, Q
5And Q
6
Described 7 detections and change-over circuit detect input voltage u in real time
In, input current i
In, intermediate dc busbar voltage u
Bus, output voltage u
o, output current i
oWith inversion inductive current i
LValue and conversion export to the 8 built-in A/D converters of TMS320C2812.
Mainly comprise in the described 6 TMS320C2812 processors: 9 improving efficiency control algolithms; 10 prime current transformer control algolithms; 12 back grade unsteady flow control algolithms.
Each analog signal conversion that 8 built-in A/D converters in the described 6 TMS320C2812 processors will be imported becomes digital value.Wherein, numerical value input voltage u
In_d, input current i
In_d, intermediate dc busbar voltage u
Bus_d, output voltage u
O_d, output current i
O_dExport to 9 improving efficiency control algolithms, 9 improving efficiency control algolithms calculate intermediate-bus voltage reference value U
Ref, being input to 10 prime current transformer control algolithms, the controlling value that 10 prime current transformer control algolithms calculate outputs to inner 11PWM comparing unit-1 again, through the PWM1 and the PWM2 signal of its generation and output prime current transformer; Numerical value output voltage u
O_d, output current i
O_dWith inversion inductive current i
L_dExport to 12 back grade unsteady flow control algolithms, the controlling value that this algorithm computation obtains outputs to inner 12PWM comparing unit-1 again, PWM3, PWM4, PWM5 and the PWM6 signal of level current transformer after its generation and output.
Described 9 improving efficiency control algolithms are as follows:
At first initial intermediate-bus voltage reference value is set at 380VDC.Behind system stability, measure the input and output electric current and voltage, the computing system efficiency eta
1, determine reference voltage increment Delta U=5V.Then with U
Ref+ Δ U give U
Ref, as new busbar voltage reference value.Treat intermediate-bus voltage U
BusBe stabilized to U
RefThe time, measure the efficiency eta that calculates under the new stable case
2Judge this efficiency eta
2Whether greater than η
1, and with η
2Give η
1If efficient has improved, then enter flow process (1); Otherwise just enter flow process (2).
Flow process (1)-continuation increases the intermediate-bus voltage reference value with U
Ref+ Δ U give U
Ref, and judge that whether this new reference value is greater than maximum reference voltage U
Ref_max=480VDC.If yes is then with U
Ref-Δ U give U
RefAs end value output and end; If no treats that then the control of prime current transformer makes intermediate-bus voltage be stabilized to U
RefAfter efficiency of measurement η again
2, judging efficiency η
2Whether greater than η
1, and with η
2Give η
1If improved efficiency then turns back to the place that flow process (1) begins; If decrease in efficiency is then with U
Ref-Δ U give U
RefAs end value output and end.
Flow process (2)-reduce the reference value of intermediate-bus voltage with U
Ref-Δ U give U
Ref, and judge that whether this reference value is less than minimum reference voltage U
Ref_min=340VDC.If yes is then with U
Ref+ Δ U give U
RefAs end value output and end; If no treats that then the control of prime current transformer makes intermediate-bus voltage be stabilized to U
RefAfter efficiency of measurement η again
2, judging efficiency η
2Whether greater than η
1, and with η
2Give η
1If improved efficiency then turns back to the place that flow process (2) begins; If decrease in efficiency is then with U
Ref+ Δ U give U
RefAs end value output and end.
In same 1kW load, under the input voltage 12VDC condition, test the efficient of more traditional control method that the intermediate dc busbar voltage is fixed as 380VDC and control method for improving efficiency proposed by the invention.Traditional method testing efficiency is 85.7%; And behind employing the present invention, intermediate-bus voltage has been adjusted to 340VDC, improved efficiency to 86.1%.
The control method for improving efficiency that this example discloses makes two-stage current transformer to adjust intermediate-bus voltage in the steady operation process, obtains higher efficient.
It should be noted that only unrestricted technical scheme of the present invention of above embodiment at last in order to explanation.
Claims (2)
1, a kind of control method for improving efficiency of two-stage current transformer is characterized in that adjusting the intermediate-bus voltage reference value U of prime current transformer output voltage
Ref, and with it as control voltage, by the output voltage U of prime current transformer control circuit control prime current transformer
BusReach intermediate-bus voltage reference value U
Ref
2, method according to claim 1 is characterized in that according to the following steps:
Initial intermediate-bus voltage reference value U is set
Ref, treat to detect behind the system stability electric current and voltage value of input and output to calculate the two-stage current transformer efficiency eta
1, determine disturbance quantity Δ U (＞0);
With U
Ref+ Δ U give U
Ref, the two-stage current transformer efficiency eta after detection computations goes out to stablize
2
Judging efficiency η
2Whether greater than η
1, and with η
2Give η
1, if η
2＞η
1, then enter flow process (1), otherwise enter flow process (2):
Flow process (1): with U
Ref+ Δ U give U
Ref, and judge U
RefWhether greater than maximum busbar voltage reference value U
Ref_max,
If yes is then with U
Ref-Δ U give U
RefExport as end value;
If no, the efficiency eta after then detection computations goes out to stablize again
2, judging efficiency η
2Whether greater than η
1, and with η
2Give η
1, if η
2＞η
1, then Returning process (1) begins the place; If η
2＜η
1, then with U
Ref-Δ U give U
RefExport as end value;
Flow process (2): with U
Ref-Δ U give U
Ref, and judge U
RefWhether less than minimum bus voltage reference value U
Ref_min,
If yes is then with U
Ref+ Δ U give U
RefExport as end value;
If no, the efficiency eta after then detection computations goes out to stablize again
2, judging efficiency η
2Whether greater than η
1, and with η
2Give η
1, if η
2＞η
1, then Returning process (2) begins the place; If η
2＜η
1, then with U
Ref+ Δ U give U
RefExport as end value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101159175A CN101626196B (en) | 2009-08-05 | 2009-08-05 | Control method for improving efficiency of two-stage current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101159175A CN101626196B (en) | 2009-08-05 | 2009-08-05 | Control method for improving efficiency of two-stage current transformer |
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| Publication Number | Publication Date |
|---|---|
| CN101626196A true CN101626196A (en) | 2010-01-13 |
| CN101626196B CN101626196B (en) | 2011-12-07 |
Family
ID=41521911
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101860234A (en) * | 2010-05-07 | 2010-10-13 | 艾默生网络能源有限公司 | Method and device for regulating bus voltage of two-stage converter |
| CN103762828A (en) * | 2013-12-31 | 2014-04-30 | 上海科世达-华阳汽车电器有限公司 | Method and device for controlling multistage power electronic converter system |
| CN109891354A (en) * | 2016-11-01 | 2019-06-14 | 莱恩半导体股份有限公司 | To the feedback control of effective high speed battery charging |
| CN111865047A (en) * | 2020-07-27 | 2020-10-30 | 珠海格力电器股份有限公司 | Power efficiency optimization method and device and power equipment |
| CN112838655A (en) * | 2020-12-31 | 2021-05-25 | 联想(北京)有限公司 | Charging circuit, power adapter, electronic device and charging method |
| CN113110683A (en) * | 2021-03-30 | 2021-07-13 | 漳州科华技术有限责任公司 | Power efficiency adjusting method, terminal and computer readable storage medium |
| CN113922692A (en) * | 2021-10-18 | 2022-01-11 | 易事特集团股份有限公司 | Method for improving overall efficiency in two-stage bidirectional DCAC converter |
| WO2022156122A1 (en) * | 2021-01-20 | 2022-07-28 | 英飞特电子（杭州）股份有限公司 | Led drive power supply and efficiency adjustment method therefor |
| CN115051534A (en) * | 2022-06-06 | 2022-09-13 | 浙江网新智能技术有限公司 | Cascade power supply system with self-adaptive adjustment of intermediate bus voltage and control method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2554861Y (en) * | 2001-12-05 | 2003-06-04 | 周仕祥 | AC/DC switch converter with high-efficient and low no-loud loss |
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2009
- 2009-08-05 CN CN2009101159175A patent/CN101626196B/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101860234B (en) * | 2010-05-07 | 2013-11-20 | 艾默生网络能源有限公司 | Method and device for regulating bus voltage of two-stage converter |
| CN101860234A (en) * | 2010-05-07 | 2010-10-13 | 艾默生网络能源有限公司 | Method and device for regulating bus voltage of two-stage converter |
| CN103762828A (en) * | 2013-12-31 | 2014-04-30 | 上海科世达-华阳汽车电器有限公司 | Method and device for controlling multistage power electronic converter system |
| CN103762828B (en) * | 2013-12-31 | 2017-09-22 | 上海科世达-华阳汽车电器有限公司 | A kind of control method and device of multistage power electronic converter system |
| CN109891354B (en) * | 2016-11-01 | 2021-05-25 | 莱恩半导体股份有限公司 | Feedback control for efficient high-speed battery charging |
| CN109891354A (en) * | 2016-11-01 | 2019-06-14 | 莱恩半导体股份有限公司 | To the feedback control of effective high speed battery charging |
| CN111865047A (en) * | 2020-07-27 | 2020-10-30 | 珠海格力电器股份有限公司 | Power efficiency optimization method and device and power equipment |
| CN112838655A (en) * | 2020-12-31 | 2021-05-25 | 联想(北京)有限公司 | Charging circuit, power adapter, electronic device and charging method |
| WO2022156122A1 (en) * | 2021-01-20 | 2022-07-28 | 英飞特电子（杭州）股份有限公司 | Led drive power supply and efficiency adjustment method therefor |
| CN113110683A (en) * | 2021-03-30 | 2021-07-13 | 漳州科华技术有限责任公司 | Power efficiency adjusting method, terminal and computer readable storage medium |
| CN113922692A (en) * | 2021-10-18 | 2022-01-11 | 易事特集团股份有限公司 | Method for improving overall efficiency in two-stage bidirectional DCAC converter |
| CN113922692B (en) * | 2021-10-18 | 2024-04-02 | 易事特集团股份有限公司 | Method for improving overall efficiency in two-stage bidirectional DCAC converter |
| CN115051534A (en) * | 2022-06-06 | 2022-09-13 | 浙江网新智能技术有限公司 | Cascade power supply system with self-adaptive adjustment of intermediate bus voltage and control method |
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|---|---|
| CN101626196B (en) | 2011-12-07 |
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