CN105703609B - A kind of Discrete control improves the device and implementation method of power system transfer efficiency - Google Patents
A kind of Discrete control improves the device and implementation method of power system transfer efficiency Download PDFInfo
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- CN105703609B CN105703609B CN201610172539.4A CN201610172539A CN105703609B CN 105703609 B CN105703609 B CN 105703609B CN 201610172539 A CN201610172539 A CN 201610172539A CN 105703609 B CN105703609 B CN 105703609B
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- field effect
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- effect pipe
- driving circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
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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 discloses devices and implementation method that a kind of Discrete control improves power system transfer efficiency, it includes power field effect pipe, it is characterized by: the output end of adaptive segmentation control module and the enable end of driving circuit connect, the output end of each driving circuit is connect with each section of power field effect pipe respectively, and pwm signal is connect with the input terminal of the input terminal of adaptive segmentation control module and driving circuit;Power field effect pipe is pressed into 1:2:--2nArea ratio be divided into n+1 sections, each section is driven by the driving circuit with enable end;The duty ratio that the pwm signal in power system is detected by digital circuit blocks, indirectly samples system load state, by sampled result compared with the reference signal of each section of power field effect pipe carries out hysteresis, exports corresponding control variable;Corresponding every section of power field effect pipe is carried out making can control by each control variable;Solve the technical problems such as power field effect pipe transfer efficiency is low.
Description
Technical field
The invention belongs to high efficiency power control techniques fields more particularly to a kind of Discrete control to improve power system conversion
The device and implementation method of efficiency.
Background technique
Transfer efficiency is one of important technology index of power electronic system.Its power for being defined as being output to load and electricity
The power ratio of source supply.Since power circuit itself has loss (the mainly loss of power device), transfer efficiency is always
Lower than 1, in order to improve efficiency, it is necessary to reduce the loss of electronic system itself as far as possible.Conducting resistance and parasitic capacitance are to draw
The main reason for playing power device loss, conducting resistance mainly results in quiescent dissipation, and parasitic capacitance mainly results in switching loss.
Currently, high power device multiselect field-effect transistors (MOSFET), and these high-power fields in the power system
It is work in switch state in effect pipe overwhelming majority situation.The frequency of the switching loss of power field effect pipe and driving signal,
Driving signal amplitude square, the parasitic input capacitance of device it is directly proportional.For applying wide power switch converter, greatly
It is mostly in middle load and when overloaded using pulse width modulation (Pulse Width Modulation, PWM) realization for load
Pulse width modulation and pulse frequency modulated (Pulse Frequency is being used in combination in self adaptive control at light load
Modulation, PFM) or Pulse skip modulation (Pulse Skip Modulation, PSM) realize self adaptive control it is same
When hoisting power system transfer efficiency.It is larger in output ripple at light load that PFM and PSM will lead to system, and control circuit phase
To relatively difficult to achieve.
Carrying out high-accuracy sampling to load current is a key technology relatively difficult to achieve in power system, and load current is got over
Greatly, sampling difficulty is also bigger.There are two types of currently used sampling methods: first is that this is not by high-precision small resistance direct sample
The working condition that only will affect primary circuit, it is also very harsh to the required precision of sample resistance;Second is that being imitated by sample-power field
Should pipe drain source voltage drop come sample load current indirectly, due to work switch state power field effect pipe drain-source pressure drop
Very little, the discreteness and precision of this method are all more difficult to control.
Summary of the invention:
The technical problem to be solved in the present invention: the device and reality of a kind of automatic adjusument high-power FET area are provided
Existing method, to solve the power as caused by power device own loss especially conducting resistance and parasitic capacitance in the prior art
The technical problems such as field-effect tube transfer efficiency is low.
Technical solution of the present invention:
A kind of Discrete control improves the device of power system transfer efficiency, it includes power field effect pipe, adaptive segmentation
The output end of control module and the enable end of driving circuit connect, and the output end of driving circuit is connect with power field effect pipe, PWM
Signal is connect with the input terminal of the input terminal of adaptive segmentation control module and driving circuit.
The adaptive segmentation control module includes duty ratio detection module, duty ratio detection module and duty ratio hysteresis ratio
It is connected compared with module conducting wire.
The output end of the adaptive segmentation control module has D0 to Dn, respectively corresponds the enabled of n+1 driving circuit
End, the output end of n+1 driving circuit respectively correspond n+1 sections of power field effect pipes.
A kind of implementation method of the device of Discrete control raising power system transfer efficiency, it includes the following steps: (1) by power
Field-effect tube presses 1:2:---:2nArea ratio be divided into n+1 sections, each section is driven by a driving circuit;
Step 2 samples the duty ratio of pwm signal in power system, and sampled result and each section of power field are imitated
Should pipe reference signal carry out hysteresis relatively after, output control signal;
Step 3 is carried out making can control by each control signal to corresponding every section of power field effect pipe.
Output control signal, its implementation described in step 2 are as follows:
Step 2.1 is realized by Digital Logical Circuits and compares PWM sampled signal and the duty ratio of each reference signal
Compared with, obtain intermediate variable A0, A1 ..., A (2n-2);
Step 2.2, when PWM sampled signal duty ratio is less than 1/ (2n- 1) A0=1 when, A1 ..., A (2n- 2) intermediate variable is
0;When pwm signal duty ratio is between 1/ (2n- 1) and 2/ (2n- 1) when between, A0=A1=1, A2 ..., A (2n- 2) intermediate variable
It is 0;And so on, when pwm signal duty ratio is greater than 98%, all intermediate variables are 1;
Step 2.3, by intermediate variable A0, A1 ..., A (2n- 2) the output adaptive segmentation control after Digital Logical Circuits
Molding block output control signal D0, D1 ..., Dn, control method are as follows:
Work as A0=1, A1=A2=...=A (2n- 2) when=0, D0=1, D1=D2=...=Dn=0;
Work as A0=A1=1, and A (2n- 2) when having rising edge, D1=1, D0=D2=...=Dn=0;
Work as A0=A1=A2=1, and A (2n- 2) when having rising edge, D0=D1=1, D2=...=Dn=0;
And so on ...
Work as A0=A1=A2=...=A (2n=1, and A (2-3)n- 2) when having rising edge, D0=D1=D2=...=Dn=
1。
Beneficial effects of the present invention:
The operation principle of the present invention is that: in the power system using PWM mode control, load is heavier, and pwm signal accounts for
Sky can be bigger than also, and the variation of pwm signal duty ratio reflects the variation of system load electric current indirectly.Sampling pwm signal accounts for
Sky than can reaction load variation and output branch working condition, and available digital circuit is sampled, and is not necessarily to
Analog-to-digital conversion, sampling result export corresponding control variable compared with each section of corresponding reference signal carries out hysteresis;And it must
It must be compared using hysteresis, be compared if only carrying out simple single limit, it may appear that be switched on and off back and forth, that is, switch oscillating occur
The case where one section of power field effect pipe, power system is caused to fail.
The parasitic capacitance of power field effect pipe and its area direct proportionality, in use, power system is most
Work, if the area of power field effect pipe all remains unchanged in entire loading range, certainly will will lead in light-load state
Specific gravity shared by switching loss increases when light load, reduces the transfer efficiency of power system, the present invention presses power field effect pipe
Scale segment, load is lighter, and the device area for participating in work is smaller, turns so as to effectively improve power system in light load
Change efficiency.
Compared with prior art, the present invention having the advantage that
With the duty ratio of digital circuit sampling pwm signal, the load condition of indirect sampling system neither influences output branch
Working condition, and reduce sampling difficulty.The area that power field effect pipe is adjusted according to load condition dynamic self-adapting,
Make power device work in middle load or full load condition while ensuring to export enough power, can be effectively reduced shared by switching loss
Specific gravity improves system transfer efficiency;It solves in the prior art due to power device own loss especially conducting resistance and posting
The technical problems such as power field effect pipe transfer efficiency caused by raw capacitor is low.
Detailed description of the invention:
Fig. 1 is schematic structural view of the invention;
Fig. 2 is present invention driver circuit structural schematic diagram.
Specific embodiment:
Illustrate: PWM represents pulse width modulating signal in Fig. 1, D0, D1 ..., Dn respectively represent (n+1) a control variable,
EN0, EN1 ..., ENn respectively represent the driving circuit enable end of each section of power field effect pipe, driver 0, driver 1 ..., drive
Dynamic device n respectively represents the driving circuit of each section of power field effect pipe, and x1 represents the smallest one section of power field effect pipe of area, x2 generation
The area of apparent power field-effect tube is twice of minimal segment, x (n+1) represents the area of power field effect pipe as the 2 of minimal segmentn
Times.
Fig. 2 be middle A0, A1 ..., A (2n- 2) (2 are respectively representedn- 1) a intermediate variable.D0, D1 ..., it is right in Dn and Fig. 1
It answers.
A kind of Discrete control improves the device of power system transfer efficiency, it includes power field effect pipe, adaptive segmentation
The output end of control module and the enable end of driving circuit connect, and the output end of driving circuit is connect with power field effect pipe, PWM
Signal is connect with the input terminal of the input terminal of adaptive segmentation control module and driving circuit.
The adaptive segmentation control module includes duty ratio detection module, duty ratio detection module and duty ratio hysteresis ratio
It is connected compared with module conducting wire.
The output end of the adaptive segmentation control module has D0 to Dn, respectively corresponds the enabled of n+1 driving circuit
End, the output end of n+1 driving circuit respectively correspond n+1 sections of power field effect pipes.
A kind of implementation method of the device of Discrete control raising power system transfer efficiency, it includes the following steps: (1) by power
Field-effect tube presses 1:2:---:2nArea ratio be divided into n+1 sections, each section is driven by a driving circuit;
The area of minimal segment power field effect pipe, adaptive segmentation can be determined by the power consumption of adaptive segmentation control module
The power consumption of control module is less than or equal to the switching loss of minimal segment power field effect pipe, according to the maximum electricity of power system load
Stream demand determines the gross area of power field effect pipe, then using minimal segment power field effect pipe as unit, according to 1:2: ...: 2n
Area ratio power field effect pipe is segmented.
Step 2 samples the duty ratio of pwm signal in power system, and sampled result and each section of power field are imitated
Should pipe reference signal carry out hysteresis relatively after, output control signal;
Step 3 is carried out making can control by each control signal to corresponding every section of power field effect pipe.
Output control signal, its implementation described in step 2 are as follows:
Step 2.1 is realized by Digital Logical Circuits and compares PWM sampled signal and the duty ratio of each reference signal
Compared with, obtain intermediate variable A0, A1 ..., A (2n-2);
Step 2.2, when PWM sampled signal duty ratio is less than 1/ (2n- 1) A0=1 when, A1 ..., A (2n- 2) intermediate variable is
0;When pwm signal duty ratio is between 1/ (2n- 1) and 2/ (2n- 1) when between, A0=A1=1, A2 ..., A (2n- 2) intermediate variable
It is 0;And so on, when pwm signal duty ratio is greater than 98%, all intermediate variables are 1;
Step 2.3, by intermediate variable A0, A1 ..., A (2n- 2) it is exported after Digital Logical Circuits is controlled adaptive
Answer Discrete control module output control signal D0, D1 ..., Dn, control method are as follows:
Work as A0=1, A1=A2=...=A (2n- 2) when=0, D0=1, D1=D2=...=Dn=0;
Work as A0=A1=1, and A (2n- 2) when having rising edge, D1=1, D0=D2=...=Dn=0;
Work as A0=A1=A2=1, and A (2n- 2) when having rising edge, D0=D1=1, D2=...=Dn=0;
And so on ...
Work as A0=A1=A2=...=A (2n=1, and A (2-3)n- 2) when having rising edge, D0=D1=D2=...=Dn=
1。
It is further elaborated below with case is embodied to technical solution of the present invention
After the number of fragments of the frequency and power field effect pipe that determine pwm signal, the clock signal of suitable frequency is selected
For sampling.The frequency of clock signal is the integral multiple of PWM signal frequency, and the significant level of each reference signal is in time shaft
Length be the clock cycle integral multiple.Power field effect pipe is pressed into 1:2:---:2nArea ratio be divided into n+1 sections after, need
(2n- 1) a reference signal, each reference signal duty ratio are followed successively by 1/ (2n-1)、2/(2n-1)、…、(2n-2)/(2n-1)、
98%, the period is all identical with the period of pwm signal, and the reference signal of different duty is generated by counter circuit.It is patrolled by number
Volume circuit realizes pwm signal compared with each reference signal, obtain one group of intermediate variable A0, A1 ..., A (2n-2).Work as PWM
Signal dutyfactor is less than 1/ (2n- 1) A0=1 when, other intermediate scalars are 0;When pwm signal duty ratio is between 1/ (2n- 1) and 2/
(2n- 1) when between, A0=A1=1, other intermediate scalars are 0;And so on.When pwm signal duty ratio is greater than 98%, institute
Having intermediate variable is 1.
Output D0, D1 of adaptive segmentation control module ..., Dn by intermediate variable A0, A1 ..., A (2n- 2) by number
Logic circuit is controlled.Specific control method is as follows:
Work as A0=1, A1=A2=...=A (2n- 2) when=0, D0=1, D1=D2=...=Dn=0;
Work as A0=A1=1, and A (2n- 2) when having rising edge, D1=1, D0=D2=...=Dn=0;
Work as A0=A1=A2=1, and A (2n- 2) when having rising edge, D0=D1=1, D2=...=Dn=0;
And so on ...
Work as A0=A1=A2=...=A (2n=1, and A (2-3)n- 2) when having rising edge, D0=D1=D2=...=Dn=
1。
The present invention by sampling to pwm signal and compared with the reference signal of each section of power field effect pipe carries out hysteresis,
Generating control signal and realizing respectively makes can control to each section of high-power FET, can effectively improve power system and gently bear
Transfer efficiency when load.Hysteresis relatively not only eliminates the phenomenon that being switched on and off a certain section of power field effect pipe back and forth, also mentions
The high anti-interference ability of control module.Those skilled in the art can be realized duty ratio detection by logic circuit and be realized to function
The Discrete control of rate field-effect tube, control circuit is easy to accomplish, and oneself power consumption is small, can effectively solve the problem that in the prior art due to
The technologies such as power field effect pipe transfer efficiency caused by power device own loss especially conducting resistance and parasitic capacitance is low
Problem.
Claims (2)
1. a kind of Discrete control improves the implementation method of the device of power system transfer efficiency, described device includes power field effect
Pipe, the output end of adaptive segmentation control module and the enable end of driving circuit connect, the output end and power field of driving circuit
The connection of effect pipe, pwm signal are connect with the input terminal of the input terminal of adaptive segmentation control module and driving circuit;It is described adaptive
Answering Discrete control module includes duty ratio detection module, and duty ratio detection module is connect with duty ratio hysteresis comparison module conducting wire;
The implementation method includes:
Power field effect pipe is pressed 1:2:---:2 by step 1nArea ratio be divided into n+1 sections, each section is carried out by a driving circuit
Driving;
Step 2 samples the duty ratio of pwm signal in power system, by sampled result and each section of power field effect pipe
Reference signal carry out hysteresis relatively after, output control signal;
Output control signal, its implementation described in step 2 are as follows:
PWM sampled signal is compared by step 2.1 by Digital Logical Circuits realization with the duty ratio of each reference signal, is obtained
To intermediate variable A0, A1 ..., A (2n-2);
Step 2.2, when PWM sampled signal duty ratio is less than 1/ (2n- 1) A0=1 when, A1 ..., A (2n- 2) intermediate variable is 0;When
Pwm signal duty ratio is between 1/ (2n- 1) and 2/ (2n- 1) when between, A0=A1=1, A2 ..., A (2n- 2) intermediate variable is 0;
And so on, when pwm signal duty ratio is greater than 98%, all intermediate variables are 1;
Step 2.3, by intermediate variable A0, A1 ..., A (2n- 2) the output adaptive Discrete control module after Digital Logical Circuits
Output control signal D0, D1 ..., Dn, control method are as follows:
Work as A0=1, A1=A2=...=A (2n- 2) when=0, D0=1, D1=D2=...=Dn=0;
Work as A0=A1=1, and A (2n- 2) when having rising edge, D1=1, D0=D2=...=Dn=0;
Work as A0=A1=A2=1, and A (2n- 2) when having rising edge, D0=D1=1, D2=...=Dn=0;
And so on ...
Work as A0=A1=A2=...=A (2n=1, and A (2-3)n- 2) when having rising edge, D0=D1=D2=...=Dn=1;
Step 3 is carried out making can control by each control signal to corresponding every section of power field effect pipe.
2. a kind of Discrete control according to claim 1 improves the implementation method of the device of power system transfer efficiency,
Be characterized in that: the output end of the adaptive segmentation control module has D0 to Dn, respectively corresponds the enabled of n+1 driving circuit
End, the output end of n+1 driving circuit respectively correspond n+1 sections of power field effect pipes.
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US20130049712A1 (en) * | 2011-08-23 | 2013-02-28 | Kabushiki Kaisha Toshiba | Dc-dc converter and information processing device |
CN103401423A (en) * | 2013-07-29 | 2013-11-20 | 电子科技大学 | Self-adaptive sectional driving DC-DC (Direct Current to Direct Current) converter |
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US20130049712A1 (en) * | 2011-08-23 | 2013-02-28 | Kabushiki Kaisha Toshiba | Dc-dc converter and information processing device |
CN103401423A (en) * | 2013-07-29 | 2013-11-20 | 电子科技大学 | Self-adaptive sectional driving DC-DC (Direct Current to Direct Current) converter |
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