CN205792202U - A kind of Discrete control improves the device of power system conversion efficiency - Google Patents
A kind of Discrete control improves the device of power system conversion efficiency Download PDFInfo
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- CN205792202U CN205792202U CN201620232189.1U CN201620232189U CN205792202U CN 205792202 U CN205792202 U CN 205792202U CN 201620232189 U CN201620232189 U CN 201620232189U CN 205792202 U CN205792202 U CN 205792202U
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- field effect
- effect pipe
- power field
- power
- drive circuit
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Abstract
The utility model discloses a kind of Discrete control and improve device and the implementation method of power system conversion efficiency, it includes power field effect pipe, it is characterized in that: the outfan of adaptive segmentation control module is connected with the Enable Pin of drive circuit, the outfan of each drive circuit is connected with each section of power field effect pipe respectively, and pwm signal is connected with the input of adaptive segmentation control module and the input of drive circuit；Power field effect pipe is pressed 1:2:2nArea ratio be divided into n+1 section, each section is driven by the drive circuit with Enable Pin；By the dutycycle of the pwm signal in digital circuit blocks detection power system, indirectly system load state is sampled, sampled result is carried out hysteresis with the reference signal of each section of power field effect pipe and compares, export corresponding control variable；Carried out enabling control to every section of corresponding power field effect pipe by each control variable；Solve the low inferior technical problem of power field effect pipe conversion efficiency.
Description
Technical field
This utility model belongs to high efficiency power control techniques field, particularly relates to a kind of Discrete control and improves power system
The device of conversion efficiency.
Background technology
Conversion efficiency is one of important technology index of power electronic system.It is defined as the output power to load with electric
The power ratio of source supply.Owing to power circuit self exists loss (the mainly loss of power device), conversion efficiency is always
Less than 1, in order to improve efficiency, it is necessary to reduce the loss of electronic system self as far as possible.Conducting resistance and parasitic capacitance are to draw
Playing the main cause of 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) in the power system, and these high-power fields
It is to be operated on off state in the case of the effect pipe overwhelming majority.The switching loss of power field effect pipe with drive signal frequency,
Drive signal amplitude square, the parasitic input capacitance of device is directly proportional.For applying wide power switch changer, greatly
Mostly it is to use pulse width modulation (Pulse Width Modulation, PWM) to realize for load when middle load and heavy duty
Self Adaptive Control, is used in combination pulse width modulation and pulse frequency modulated (Pulse Frequency when underloading
Modulation, PFM) or Pulse skip modulation (Pulse Skip Modulation, PSM) realize the same of Self Adaptive Control
Time hoisting power system conversion efficiency.PFM and PSM can cause system output ripple when underloading relatively big, and control circuit phase
To relatively difficult to achieve.
It is a key technology relatively difficult to achieve in power system that load current carries out high-accuracy sampling, and load current is more
Greatly, sampling difficulty is the biggest.The most conventional sampling method has two kinds: one to be that this is not by high-precision small resistor direct sample
Only can affect the duty of primary circuit, the required precision to sample resistance is the harshest；Two is to be imitated by sample-power field
Should pipe drain source voltage fall indirectly sample load current, owing to being operated in the power field effect pipe drain-source pressure drop of on off state
The least, the discreteness of this method and the most difficult control of precision.
Utility model content:
The technical problems to be solved in the utility model: the dress of a kind of Automatic adjusument high-power FET area is provided
Put, to solve the power field effect caused in prior art due to power device own loss especially conducting resistance and parasitic capacitance
Should the low inferior technical problem of pipe conversion efficiency.
Technical solutions of the utility model:
A kind of Discrete control improves the device of power system conversion efficiency, and it includes power field effect pipe, adaptive segmentation
The outfan of control module is connected with the Enable Pin of drive circuit, and the outfan of drive circuit is connected with power field effect pipe, PWM
Signal is connected with the input of adaptive segmentation control module and the input of drive circuit.
Described adaptive segmentation control module includes dutycycle detection module, dutycycle detection module and dutycycle hysteresis ratio
Relatively module wire connects.
The outfan of described adaptive segmentation control module has D0 to Dn, the enable of the most corresponding n+1 drive circuit
End, the most corresponding n+1 section power field effect pipe of the outfan of n+1 drive circuit.
The beneficial effects of the utility model:
Operation principle of the present utility model is: in the power system using PWM mode to control, load the heaviest, pwm signal
Dutycycle also can be the biggest, the change of pwm signal dutycycle reflects the change of system load electric current indirectly.Sampling pwm signal
Dutycycle can reaction load change, do not interfere with again the duty of output branch road, and available digital circuit be sampled,
Without analog-to-digital conversion, the reference signal that sampling result is corresponding with each section carries out hysteresis and compares, and exports corresponding control variable；And
And hysteresis must be used to compare, compare if being only by simple single limit, it may appear that be switched on and off back and forth, i.e. occur that switch shakes
Swing the situation of a certain section of power field effect pipe, cause power system to lose efficacy.
The parasitic capacitance of power field effect pipe and its area direct proportionality, in use, power system is most
It is operated in light-load state, if the area of power field effect pipe all keeps constant in whole loading range, will certainly cause
During light load, the proportion shared by switching loss increases, and reduces the conversion efficiency of power system, and this utility model is by power field effect
Managing segmentation in proportion, load the lightest, the device area participating in work is the least, it is thus possible to be effectively improved power system when gently loading
Conversion efficiency.
This utility model compared with prior art, has the advantage that
With the dutycycle of digital circuit sampling pwm signal, the load condition of indirect sampler, neither impact output branch road
Duty, reduce again sampling difficulty.The area of power field effect pipe is adjusted according to load condition dynamic self-adapting,
Make power device be operated in middle load or full load condition while guaranteeing to export enough power, can effectively reduce shared by switching loss
Proportion, improves system conversion efficiency；Solve in prior art due to power device own loss especially conducting resistance and posting
The low inferior technical problem of power field effect pipe conversion efficiency that raw electric capacity causes.
Accompanying drawing illustrates:
Fig. 1 is this utility model structural representation；
Fig. 2 is this utility model driving circuit structure schematic diagram.
Detailed description of the invention:
Illustrating: in Fig. 1, PWM represents pulse width modulating signal, D0, D1 ..., Dn represent (n+1) individual control variable respectively,
EN0, EN1 ..., ENn represent the drive circuit Enable Pin of each section of power field effect pipe respectively, driver 0, driver 1 ..., drive
Dynamic device n represents the drive circuit of each section of power field effect pipe respectively, and x1 represents one section of minimum power field effect pipe of area, x2 generation
The area of apparent power field effect transistor is that the twice of minimal segment, x (n+1) represent area is minimal segment the 2 of power field effect pipen
Times.
Fig. 2 is middle A0, A1 ..., A (2n-2) (2 are represented respectivelyn-1) individual intermediate variable.In D0, D1 ..., Dn and Fig. 1 right
Should.
A kind of Discrete control improves the device of power system conversion efficiency, and it includes power field effect pipe, adaptive segmentation
The outfan of control module is connected with the Enable Pin of drive circuit, and the outfan of drive circuit is connected with power field effect pipe, PWM
Signal is connected with the input of adaptive segmentation control module and the input of drive circuit.
Described adaptive segmentation control module includes dutycycle detection module, dutycycle detection module and dutycycle hysteresis ratio
Relatively module wire connects.
The outfan of described adaptive segmentation control module has D0 to Dn, the enable of the most corresponding n+1 drive circuit
End, the most corresponding n+1 section power field effect pipe of the outfan of n+1 drive circuit.
A kind of Discrete control improves the implementation method of the device of power system conversion efficiency, and it includes:
Step 1, power field effect pipe is pressed 1:2:---:2nArea ratio be divided into n+1 section, each section is driven electricity by one
Road is driven；
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 with minimal segment power field effect pipe as unit, according to 1:2: ...: 2n
Area ratio power field effect pipe is carried out segmentation.
Step 2, the dutycycle of pwm signal in power system is sampled, by sampled result and each section of power field effect
Should the reference signal of pipe carry out hysteresis relatively after, export control signal；
Step 3, carried out enabling control to every section of corresponding power field effect pipe by each control signal.
Exporting control signal described in step 2, its implementation is:
Step 2.1, by Digital Logical Circuits realize the dutycycle of PWM sampled signal with each reference signal is compared
Relatively, intermediate variable A0, A1 ..., A (2 are obtainedn-2)；
Step 2.2, when PWM sampled signal dutycycle is less than 1/ (2n-1) A0=1 time, A1 ..., A (2n-2) intermediate variable is
0；When pwm signal dutycycle is between 1/ (2n-1) and 2/ (2n-1) time between, A0=A1=1, A2 ..., A (2n-2) intermediate variable
It is 0；The like, when pwm signal dutycycle is more than 98%, all intermediate variables are 1；
Step 2.3, by intermediate variable A0, A1 ..., A (2n-2) export after Digital Logical Circuits is controlled adaptive
Answering output control signal D0 of Discrete control module, D1 ..., Dn, its control method is:
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；
By that analogy ...
Work as A0=A1=A2=...=A (2n-3)=1, and A (2n-2) when having rising edge, D0=D1=D2=...=Dn=
1。
Technical solutions of the utility model are further elaborated being embodied as case below
After the number of fragments of the frequency and power field effect pipe that determine pwm signal, select the clock signal of suitable frequency
For sampling.The frequency of clock signal is the integral multiple of pwm signal frequency, and the significant level of each reference signal is at time shaft
The integral multiple of a length of clock cycle.Power field effect pipe is pressed 1:2:---:2nArea ratio be divided into n+1 section after, it is desirable to have
(2n-1) individual reference signal, each reference signal dutycycle is followed successively by 1/ (2n-1)、2/(2n-1)、…、(2n-2)/(2n-1)、
98%, the cycle is all identical with the cycle of pwm signal, and the reference signal of different duty is produced by counter circuit.Patrolled by numeral
Collect the comparison of circuit realiration pwm signal and 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 time, other intermediate scalar are 0；When pwm signal dutycycle is between 1/ (2n-1) and 2/
(2n-1), time between, A0=A1=1, other intermediate scalar are 0；The like.When pwm signal dutycycle is more than 98%, institute
Intermediate variable is had to be 1.
The output D0 of adaptive segmentation control module, D1 ..., Dn are by intermediate variable A0, A1 ..., A (2n-2) through numeral
Logic circuit is controlled.Concrete 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；
The like ...
Work as A0=A1=A2=...=A (2n-3)=1, and A (2n-2) when having rising edge, D0=D1=D2=...=Dn=
1。
This utility model carries out hysteresis ratio by the reference signal to the sampling of pwm signal with each section of power field effect pipe
Relatively, produce control signal and realize the control of the enable to each section of high-power FET respectively, it is possible to be effectively improved power system and exist
Conversion efficiency during light load.Hysteresis compares and not only eliminates the phenomenon being switched on and off a certain section of power field effect pipe back and forth,
Also improve the capacity of resisting disturbance of control module.Those skilled in the art can realize dutycycle by logic circuit and detect and realize
Discrete control to power field effect pipe, control circuit easily realizes, and oneself power consumption is little, it is possible to effectively solve in prior art
The power field effect pipe conversion efficiency caused due to power device own loss especially conducting resistance and parasitic capacitance is low inferior
Technical problem.
Claims (2)
1. Discrete control improves a device for power system conversion efficiency, and it includes power field effect pipe, it is characterised in that: from
The outfan adapting to Discrete control module is connected with the Enable Pin of drive circuit, the outfan of drive circuit and power field effect pipe
Connecting, pwm signal is connected with the input of adaptive segmentation control module and the input of drive circuit；Described adaptive segmentation
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 with minimal segment power field effect pipe as unit, according to 1:2: ...: 2n
Area ratio power field effect pipe is carried out segmentation；Described adaptive segmentation control module includes dutycycle detection module, duty
Being connected with dutycycle hysteresis comparison module wire than detection module, described dutycycle hysteresis comparison module realizes in power system
The sampled result of the dutycycle of pwm signal carries out after hysteresis compares with the reference signal of each section of power field effect pipe, output control
Signal processed.
A kind of Discrete control the most according to claim 1 improves the device of power system conversion efficiency, it is characterised in that: institute
The outfan stating adaptive segmentation control module has D0To Dn, the Enable Pin of the most corresponding n+1 drive circuit, n+1 is driven
The most corresponding n+1 section power field effect pipe of the outfan on galvanic electricity road.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620232189.1U CN205792202U (en) | 2016-03-24 | 2016-03-24 | A kind of Discrete control improves the device of power system conversion efficiency |
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| CN201620232189.1U CN205792202U (en) | 2016-03-24 | 2016-03-24 | A kind of Discrete control improves the device of power system conversion efficiency |
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| CN205792202U true CN205792202U (en) | 2016-12-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111740569A (en) * | 2020-07-06 | 2020-10-02 | 重庆邮电大学 | Floating gate width switching circuit applied to high-efficiency DC-DC converter |
-
2016
- 2016-03-24 CN CN201620232189.1U patent/CN205792202U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111740569A (en) * | 2020-07-06 | 2020-10-02 | 重庆邮电大学 | Floating gate width switching circuit applied to high-efficiency DC-DC converter |
| CN111740569B (en) * | 2020-07-06 | 2021-07-13 | 重庆邮电大学 | Floating gate width switching circuit applied to high-efficiency DC-DC converter |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161207 |
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| CF01 | Termination of patent right due to non-payment of annual fee |