CN109194135A - A kind of adaptive efficiency optimization method of resonant state adjustable type power inverter - Google Patents
A kind of adaptive efficiency optimization method of resonant state adjustable type power inverter Download PDFInfo
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- CN109194135A CN109194135A CN201811043770.9A CN201811043770A CN109194135A CN 109194135 A CN109194135 A CN 109194135A CN 201811043770 A CN201811043770 A CN 201811043770A CN 109194135 A CN109194135 A CN 109194135A
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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
- H02M3/22—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
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/4815—Resonant converters
-
- 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)
- Inverter Devices (AREA)
Abstract
The present invention relates to a kind of adaptive efficiency optimization methods of resonant state adjustable type power inverter, power inverter includes single or multiple resonance topologicals, each resonance topological is by individual control signal control, control signal is connected to auxiliary circuit or original device inside resonance topological, optimization method include: measure current state under N number of voltage and M electric current after, the value of N and M depends on actual resonant circuit structure, in the case where not changing gain, carry out the efficiency-optimization control that frequency is mutually cooperateed with resonant state, then control signal is exported to power inverter, realize maximal efficiency tracking.Compared with prior art, the present invention passes through the Collaborative Control of resonant state and switching frequency, the Adaptive matching of switching frequency is carried out in resonant state dynamic regulation, so that controlled resonant converter obtains the trade-off optimization of switching loss and conduction loss, and the voltage gain wide scope in the case of switching frequency close limit can be maintained to adjust.
Description
Technical field
The present invention relates to a kind of efficiency optimization methods of power inverter, more particularly, to a kind of resonant state adjustable type function
The adaptive efficiency optimization method of rate converter.
Background technique
High frequency, high power density and high efficiency are the development trends of DC/DC power inverter, traditional hard switching transformation
Device can generate biggish switching loss and noise, limit the raising of power density and switching frequency, therefore propose Sofe Switch
Power inverter.
Currently used one kind is phase-shifted full-bridge converter, and the no-voltage conducting (ZVS) of main switch may be implemented in it, but
The Sofe Switch realization of lagging leg is more difficult, and there are reverse-recovery problems for secondary side rectifier diode, are unfavorable for mentioning for efficiency
It is high.
Another kind of the most commonly used is LLC resonant converters, it can realize the no-voltage of main switch in full-load range
Conducting and zero-current switching (ZCS), secondary side rectifier diode can also realize ZCS.But LLC converter uses frequency modulation control mode,
Switching frequency is excessive if it is less than resonance frequency, and it is too long to will lead to the circulation duration, so that transducer effciency reduces.For moving
Facies-controlled resonance circuit equally exists problems, and harmonic period and switch periods gap cause greatly under the efficiency of converter
Drop.
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of resonant state is adjustable
The adaptive efficiency optimization method of type power inverter.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of adaptive efficiency optimization method of resonant state adjustable type power inverter, the power inverter include
Single or multiple resonance topologicals, the input terminal parallel connection or combination connection of each resonance topological, output end parallel connection or combination are connected to negative
It carries, each resonance topological is controlled by individual control signal, and control signal is connected to the auxiliary circuit or original inside resonance topological
Device,
The optimization method include: measure current state under N number of voltage and M electric current after, the value of N and M depend on
In actual resonant circuit structure, in the case where not changing gain, the efficiency optimization that frequency is mutually cooperateed with resonant state is carried out
Then control exports control signal to power inverter, realizes maximal efficiency tracking.
The frequency with the efficiency optimization control method that resonant state mutually cooperates with includes look-up table, interpolation calculation method, disturbs
Dynamic one of observation and closed-loop control method or a variety of.
The look-up table are as follows: the optimum point parameter list in each operating condition is formulated, it can by tabling look-up determining resonant state
The frequency and duty ratio and phase shifting control parameter of tune type power inverter.
The interpolation calculation method are as follows: by judging the efficiency change trend under different control parameters three times, if it exists on
Liter and downward trend then carry out interpolation calculation, find near-optimization point.
The perturbation observation method the following steps are included:
S1 obtains input voltage and input current, the output voltage electric current of current state 1, calculates the efficiency of state 1；
S2 changes frequency and phase shifting angle under the premise of guaranteeing output voltage, or changes frequency and duty ratio, obtains state 2；
S3 obtains input voltage and input current, the output voltage electric current of state 2, calculates the efficiency of state 2；
S4, judges whether the efficiency of state 2 is greater than state 1, if so, entering step S5, otherwise enters step S6；
S5 calculates the efficiency of state 1, on the basis of state 1, according to step by current state 2 as new state 1
The rapid same direction S2 continues to change frequency and phase shifting angle, or changes frequency and duty ratio, obtains new state 2, return step
S3；
S6 continues to change frequency and phase shifting angle according to the opposite direction step S2, or change frequency on the basis of state 1
Rate and duty ratio obtain new state 2, return step S3.
The control signal is generated by PWM module.
Compared with prior art, the invention has the following advantages that
(1) Collaborative Control for passing through resonant state and switching frequency, carries out switching frequency in resonant state dynamic regulation
Adaptive matching and switching frequency can be maintained so that controlled resonant converter obtains the trade-off optimization of switching loss and conduction loss
Voltage gain wide scope in the case of close limit is adjusted.
(2) for the converter of resonant state adjustable type, such as Injection Current type controlled resonant converter, resonant state can be with
The variation of input voltage and change, once more, the circulation time meeting in a switch periods that resonance time is smaller than switch periods
Very big specific gravity is accounted for, is unfavorable for the raising of efficiency, therefore pass through the Collaborative Control of resonant state and switching frequency, can reduce circulation
Duration improves the efficiency of power inverter.
(3) for traditional LLC, to realize wide scope regulating power, the variation range of switching frequency is wide, in high frequency
Biggish switching loss can be generated, the adjustable code converter of resonance after efficiency optimization can be adjusted in conjunction with duty ratio or phase shift,
In the case that voltage gain adjustable range is constant, switching frequency close limit is allowed to change, to realize switching loss and conduction loss
Trade-off optimization, be conducive to the raising of efficiency.Maximal efficiency tracking control mode can allow converter always work in efficiency compared with
For the operating point of optimization.
Detailed description of the invention
Fig. 1 is the structural block diagram of the present embodiment power inverter；
Fig. 2 is that the present embodiment optimization method controls route map；
Fig. 3 is the circuit diagram of the controlled resonant converter of the present embodiment current-injecting；
Fig. 4 is the present embodiment exemplary waveform diagram；
Fig. 5 (a), 5 (b), 5 (c), 5 (d), 5 (e) are respectively the mode 1 of the present embodiment controlled resonant converter, mode 2, mode
3, the circuit diagram of mode 4, mode 5；
Fig. 6 is the flow chart of the present embodiment perturbation observation method；
Fig. 7 (a)~7 (c) is efficiency comparative's figure of the current-injecting resonance current with/without efficiency optimization, Fig. 7 (a)~7
(c) input voltage is respectively 260V, 300V, 340V.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to
Following embodiments.
Embodiment
Fig. 1 is the structural block diagram of power inverter of the present invention, including (resonance topological includes half to (N >=1) a resonance topological
Bridge/full bridge structure resonance topological, phase-shifting resonance topology, asymmetrical half-bridge/full-bridge resonance topological, normal shock resonance topological, LLC or
LCL or CL topology, compound resonance are opened up, more level are topological and multiport converter).There is N number of auxiliary circuit or utilizes original device
Part carries out resonant state adjustment, and there may be coupled relation between each resonance topological, such as n-th of resonance topological utilizes (n+1)th
The adjusting of resonance topological progress resonant state.There is N number of control signal to correspond to N number of resonance topological, to the switching tube in resonance topological
Control signal is provided.Energy is transmitted to resonance topological by the connection or combination connection (i.e. series connection and mixing in parallel) of input terminal,
Multiple resonance topologicals provide energy to load after the connection of output end or combination connection.
Present invention is generally directed to such circuits to carry out efficiency optimization, under controlling thinking as shown in Fig. 2, measuring current state
After N number of voltage and M electric current (N and M number depend on actual resonant circuit structure), carries out frequency and resonant state etc. and join
The efficiency-optimization control that number mutually cooperates with, then by exporting control signal after PWM module to power inverter, to complete to control
System realizes maximal efficiency tracking.This control thinking needs to obtain voltage and current signals, to carry out closed-loop control, is not changing
Efficiency optimization is realized in the case where variable-gain.Fig. 3 is the four of the efficiency-optimization control that the parameters such as frequency and resonant state mutually cooperate with
Kind method (only enumerating four kinds, there are also other methods), including look-up table, interpolation calculation method, perturbation observation method and closed-loop control method.
As shown in fig. 6, perturbation observation method the following steps are included:
S1 obtains input voltage and input current, the output voltage electric current of current state 1, calculates the efficiency of state 1；
S2 changes frequency and phase shifting angle under the premise of guaranteeing output voltage, or changes frequency and duty ratio, obtains state 2；
S3 obtains input voltage and input current, the output voltage electric current of state 2, calculates the efficiency of state 2；
S4, judges whether the efficiency of state 2 is greater than state 1, if so, entering step S5, otherwise enters step S6；
S5 calculates the efficiency of state 1, on the basis of state 1, according to step by current state 2 as new state 1
The rapid same direction S2 continues to change frequency and phase shifting angle, or changes frequency and duty ratio, obtains new state 2, return step
S3；
S6 continues to change frequency and phase shifting angle according to the opposite direction step S2, or change frequency on the basis of state 1
Rate and duty ratio obtain new state 2, return step S3.
By the Collaborative Control of resonant state and switching frequency, oneself of switching frequency is carried out in resonant state dynamic regulation
Matching is adapted to, so that controlled resonant converter obtains the trade-off optimization of switching loss and conduction loss, and the narrow model of switching frequency can be maintained
Voltage gain wide scope in the case of enclosing is adjusted.
For the converter of resonant state adjustable type, such as Injection Current type controlled resonant converter, resonant state can be with defeated
Enter the variation of voltage and change, once much smaller than switch periods of resonance time, the circulation time in a switch periods can be accounted for
Very big specific gravity is unfavorable for the raising of efficiency, therefore passes through the Collaborative Control of resonant state and switching frequency, can reduce circulation and holds
The continuous time, improve the efficiency of power inverter.For traditional LLC, to realize wide scope regulating power, the change of switching frequency
It is wide to change range, biggish switching loss can be generated in high frequency, the adjustable code converter of resonance after efficiency optimization can be combined and be accounted for
Sky ratio or phase shift are adjusted, and in the case where voltage gain adjustable range is constant, switching frequency close limit are allowed to change, opened to realize
The trade-off optimization for closing loss with conduction loss, is conducive to the raising of efficiency.The control mode of maximal efficiency tracking can allow converter
Always work in the operating point that efficiency more optimizes.
As shown in figure 3, the present embodiment is the controlled resonant converter of current-injecting, it is made of two half-bridges, one is LLC half
Bridge, the other is auxiliary half-bridge, realizes output voltage adjusting and efficiency optimization by phase shift and frequency trim.Wherein Q1~Q4It is
Switching tube, L1It is resonant inductance, L2It is auxiliary induction, C1It is resonant capacitance, T1It is transformer, turn ratio Np: Ns: Ns, LMIt is T1's
Magnetizing inductance, D1、D2It is rectifier diode, CinIt is input filter capacitor, CoIt is output filter capacitor.
Fig. 4 is the exemplary waveform diagram of the present embodiment, wherein vGS1~vGS4It is Q respectively1~Q4Drive waveforms, vTpIt is transformation
Device original edge voltage waveform, iL1And iL2It is L respectively1And L2Current waveform, iMIt is T1Excitation current waveform, isIt is secondary current
Waveform.
In a switch periods, the present invention can be divided into 10 operation modes, wherein t2~t5And t7~t10It is phase shifting angle
Spend TFS, t1~t2、t4~t5、t6~t7And t9~t10It is dead time tdead, in the case where dead time is ignored, two half-bridges
Duty ratio be all 50%, therefore transformer T1There is no D.C. magnetic biasings.The equivalent circuit of each switch mode is as shown in figure 5, work
It is as follows to make process:
1 [t of mode0~t1]: as shown in Fig. 5 (a), t0Moment, switching tube Q1It is connected, Q in this mode2And Q4It is off shape
State, Q3It is in the conductive state, vTpBy secondary side clamper, LLC half-bridge starts resonance, secondary side D2Conducting, iL1And iMDifference be transmitted to
Secondary side, iL2Approximately linear decline.
2 [t of mode1~t2]: as shown in Fig. 5 (b), this mode is to assist the dead time of half-bridge, t1Moment, switching tube Q3
Shutdown, due to iL2It is smaller, it is believed that be ZCS, electric current iL2It is transferred to Q4Body diode to realize Q4ZVS.
3 [t of mode2~t3]: as shown in Fig. 5 (c), t2Moment, switching tube Q4It is connected, Q in this mode1It is in the conductive state,
Q2And Q3It is in an off state, iL2Start approximately linear to rise.
4 [t of mode3~t4]: as shown in Fig. 5 (d), t3Moment, iL1Resonance arrives and iMIt is equal, secondary side D2It disconnects, iL1And iM
Start slowly to rise.
5 [t of mode4~t5]: as shown in Fig. 5 (e), this mode is the dead time of LLC half-bridge, t5Moment, switching tube Q1 are closed
It is disconnected, due to iMIt is smaller, it is believed that be ZCS, electric current iL1It is transferred to Q2Body diode to realize Q2ZVS.
t6~t10Operation mode it is close with 1~mode of mode 5, no longer elaborate here, t10Moment, a switch week
Phase terminates, and starts next switch periods.
Due to can reduce gain with the increase of phase shift time, so that output voltage is adjusted, but resonance time has
Reduced, so as to cause the increase of circulation duration, it is therefore desirable to which suitably increase frequency, the present embodiment is by resonance time and switchs
The ratio in period is set as 0.8, to improve the efficiency of converter.In addition the perturbation observation method that Fig. 7 can also be used carries out maximum effect
Rate tracking.
The present embodiment is 260V~340V input (specified input is 300V), and 48V/5A output is excellent with no progress efficiency
The Injection Current type resonance circuit of change compares.Table 1 is the major parameter of the present embodiment.
1 the present embodiment major parameter of table
| Switching frequency fs/kHz | 200 |
| Resonant inductance L1/uH | 12.5 |
| Resonant capacitance C1/nF | 30 |
| Inductance L2/uH | 226 |
| Transformer T1Turn ratio Np:Ns:Ns | 20:6:6 |
| Transformer T1Magnetizing inductance LM/uH | 200 |
Fig. 7 (a)~7 (c) is efficiency comparative's figure of the current-injecting resonance current whether there is or not efficiency optimization, it is known that in 260V
When input, the efficiency of the two is suitable, and when 300V and 340V is inputted, the present embodiment with efficiency optimization has some superiority,
Efficiency is about high by 1.5%~2%.
Claims (6)
1. a kind of adaptive efficiency optimization method of resonant state adjustable type power inverter, the power inverter includes single
The input terminal of a or multiple resonance topologicals, each resonance topological is in parallel or combination connection, output end parallel connection or combination are connected to load,
Each resonance topological is connected to auxiliary circuit or original device inside resonance topological by individual control signal control, control signal
Part,
It is characterized in that, N and M's takes after the optimization method includes: the N number of voltage and M electric current measured under current state
Value depends on actual resonant circuit structure, in the case where not changing gain, carries out the effect that frequency is mutually cooperateed with resonant state
Then rate optimal control exports control signal to power inverter, realizes maximal efficiency tracking.
2. a kind of adaptive efficiency optimization method of resonant state adjustable type power inverter according to claim 1,
It is characterized in that, the frequency with the efficiency optimization control method that resonant state mutually cooperates with includes look-up table, interpolation calculation method, disturbs
Dynamic one of observation and closed-loop control method or a variety of.
3. a kind of adaptive efficiency optimization method of resonant state adjustable type power inverter according to claim 2,
It is characterized in that, the look-up table are as follows: the optimum point parameter list in each operating condition is formulated, it can by tabling look-up determining resonant state
The frequency and duty ratio and phase shifting control parameter of tune type power inverter.
4. a kind of adaptive efficiency optimization method of resonant state adjustable type power inverter according to claim 2,
Be characterized in that, the interpolation calculation method are as follows: by judging the efficiency change trend under different control parameters three times, if it exists on
Liter and downward trend then carry out interpolation calculation, find near-optimization point.
5. a kind of adaptive efficiency optimization method of resonant state adjustable type power inverter according to claim 2,
Be characterized in that, the perturbation observation method the following steps are included:
S1 obtains input voltage and input current, the output voltage electric current of current state 1, calculates the efficiency of state 1；
S2 changes frequency and phase shifting angle under the premise of guaranteeing output voltage, or changes frequency and duty ratio, obtains state 2；
S3 obtains input voltage and input current, the output voltage electric current of state 2, calculates the efficiency of state 2；
S4, judges whether the efficiency of state 2 is greater than state 1, if so, entering step S5, otherwise enters step S6；
S5 calculates the efficiency of state 1, on the basis of state 1, according to step S2 by current state 2 as new state 1
Same direction continues to change frequency and phase shifting angle, or changes frequency and duty ratio, obtains new state 2, return step S3；
S6 continues to change frequency and phase shifting angle according to the opposite direction step S2 on the basis of state 1, or change frequency and
Duty ratio obtains new state 2, return step S3.
6. a kind of adaptive efficiency optimization method of resonant state adjustable type power inverter according to claim 1,
It is characterized in that, the control signal is generated by PWM module.
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Cited By (2)
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| CN112787515A (en) * | 2020-12-31 | 2021-05-11 | 西安理工大学 | Efficiency optimization design method of double-active full-bridge DC-DC converter |
| CN117713563A (en) * | 2024-02-06 | 2024-03-15 | 常熟理工学院 | Expansion three-degree-of-freedom modulation control method and system for LCL type resonant converter |
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| CN107425610A (en) * | 2017-05-10 | 2017-12-01 | 北京交通大学长三角研究院 | Radio energy transmission system and control method based on energy resource system load compensation in parallel |
| CN107565710A (en) * | 2017-09-08 | 2018-01-09 | 哈尔滨工程大学 | It is automatically adjusted to the magnet coupled resonant type wireless electric power system of frequency optimum traffic |
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| CN112787515A (en) * | 2020-12-31 | 2021-05-11 | 西安理工大学 | Efficiency optimization design method of double-active full-bridge DC-DC converter |
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