CN109327151A - A kind of three-phase wideband exchange input adaptive circuit of synchronous rectification and control method - Google Patents
A kind of three-phase wideband exchange input adaptive circuit of synchronous rectification and control method Download PDFInfo
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- CN109327151A CN109327151A CN201710635857.4A CN201710635857A CN109327151A CN 109327151 A CN109327151 A CN 109327151A CN 201710635857 A CN201710635857 A CN 201710635857A CN 109327151 A CN109327151 A CN 109327151A
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
-
- 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
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
- H02M7/2195—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration the switches being synchronously commutated at the same frequency of the AC input voltage
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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)
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Abstract
The invention discloses a kind of three-phase wideband exchange input adaptive circuit of synchronous rectification and control methods, including sequentially connected generator three-phase alternating-current supply, current detection circuit and voltage detecting circuit, rectified three-phase circuit and DC voltage-stabilizing output circuit are connected between the current detection circuit and voltage detecting circuit；Three phase rectifier；Filtering；DC voltage-stabilizing output.The present invention is obtained current value and is set its corresponding threshold value using current sensor or other modes, shutdown is opened control corresponding field-effect tube, and then realize the power supply conversion of wideband three-phase alternating current input, so that power supply conversion rectification circuit remains to work normally in the case where three-phase input frequency transformation, and circuit is simple, it is easy to control, so that rectification circuit is had the characteristics that simple control, high conversion efficiency, calorific value are few, adaptive, is suitable for high tacho generator power-switching circuit.
Description
Technical field
The present invention relates to a kind of wideband adaptive synchronous commutating circuit and control strategies, and more specifically, it relates to one kind
Three-phase wideband exchanges input adaptive circuit of synchronous rectification and control method.
Background technique
With the development of power electronics, to the isometric weight demands of certain electronic equipments such as aerogenerator increasingly light weight
Change, required output power are also increasing.Traditional power electronics conversion circuit is generally carried out using diode fashion whole
Circulation is changed, and due to the drooping characteristic of diode itself, causes transfer efficiency low, calorific value is big.Especially in high frequency three-phase alternating current
When input, under the occasion of low-voltage, high-current, traditional conversion circuit is even more to be unable to control.General solution uses field-effect tube
(MOSFET), it is rectified to substitute diode, also becomes synchronous rectification.In addition, relatively advanced control is using voltage-mode
Type carries out vector model- following control, although transfer efficiency can be improved largely, algorithm comparison is complicated, and defeated in power supply
Enter side if there is harmonic wave can be that conversion and control becomes disorder, it is unstable.
Summary of the invention
Purpose of the invention is to overcome the shortcomings in the prior art, and it is adaptive to provide a kind of three-phase wideband exchange input
Circuit of synchronous rectification and control method are answered, obtain current value using current sensor or other modes and sets its corresponding threshold
Value to control the shutdown of opening of corresponding field-effect tube, and then realizes the power supply conversion of wideband three-phase alternating current input, so that power supply turns
It changes rectification circuit to remain to work normally in the case where three-phase input frequency transformation, and circuit is simple, it is easy to control, make to rectify
Circuit has the characteristics that simple control, high conversion efficiency, calorific value are few, adaptive.
The purpose of the present invention can be achieved through the following technical solutions.
A kind of three-phase wideband exchange input adaptive circuit of synchronous rectification, including sequentially connected generator three-phase alternating current
It is whole to be connected with three-phase between the current detection circuit and voltage detecting circuit for source, current detection circuit and voltage detecting circuit
Current circuit and DC voltage-stabilizing output circuit；
The rectified three-phase circuit includes constituting the first field-effect tube of three-phase synchronous rectification bridge, the second field-effect tube, the
Three field-effect tube, the 4th field-effect tube, the 5th field-effect tube and the 6th field-effect tube, first field-effect tube, third field effect
It should manage and be both connected to together with the drain electrode of the 5th field-effect tube, common drain end；Second field-effect tube, the 4th field-effect tube and
The source electrode of 6th field-effect tube is both connected to together, common source terminal；First is in series between the common drain end and common source terminal
Inductance and first capacitor；
The DC voltage-stabilizing output circuit includes the 7th field-effect tube and the 8th field-effect for being parallel to first capacitor both ends
Pipe, and the 7th field-effect tube and the 8th field-effect tube are serially connected, it is in parallel between the drain electrode and source electrode of the 8th field-effect tube
There are the second inductance and the second capacitor, and the second inductance and the second capacitor are serially connected, voltage detecting circuit is parallel to the second capacitor
Both ends；
The three-phase current output end of the current detection circuit is connected to the current input terminal of MCU, the voltage detecting electricity
The voltage output end on road is connected to the voltage input end of MCU, and the current output terminal of the MCU is respectively connected to the first field-effect
The grid of pipe, the second field-effect tube, third field-effect tube, the 4th field-effect tube, the 5th field-effect tube and the 6th field-effect tube, institute
The voltage output end for stating MCU is respectively connected to the grid of the 7th field-effect tube and the 8th field-effect tube.
The source electrode of first field-effect tube and the drain electrode of the second field-effect tube are connected to the A phase electricity of current detection circuit
Flow output end；The source electrode of the third field-effect tube and the drain electrode of the 4th field-effect tube are connected to the B phase of current detection circuit
Current output terminal；The source electrode of 5th field-effect tube and the drain electrode of the 6th field-effect tube are connected to the C of current detection circuit
Phase current output end.
The source electrode of 7th field-effect tube and the drain series of the 8th field-effect tube are together.
First field-effect tube, the second field-effect tube, third field-effect tube, the 4th field-effect tube, the 5th field-effect tube,
6th field-effect tube, the 7th field-effect tube and the 8th field-effect tube are all made of N-type MOSFET field-effect tube.
The purpose of the present invention can be also achieved through the following technical solutions.
A kind of control method of three-phase wideband exchange input adaptive circuit of synchronous rectification, comprising the following steps:
Step 1, three phase rectifier: the power supply of generator three-phase alternating-current supply, when current detection circuit has detected electric current input
Afterwards, the three-phase electricity flow valuve that can be will test gives MCU respectively, and three-phase electricity flow valuve is compared with given threshold respectively: if certain
One phase current values are greater than positive given threshold i >+Ith, then the field-effect tube hair that MCU is connected to source electrode with the phase current output end
The pulse signal opened is sent, this field-effect tube is connected；If a certain phase current values be less than negative given threshold i <-Ith, MCU to
The field-effect tube being connected with the phase current output end that drains sends the pulse signal opened, this field-effect tube is connected；If certain
One phase current values are in m- Ith≤i≤+ Ith of positive given threshold and negative given threshold, then MCU is not to defeated with the phase current
Two field-effect tube that outlet is connected send the pulse signal opened, and pass through the parasitic diode incoming flow of this two field-effect tube
Overcurrent.
Step 2, filtering: by the first field-effect tube, the second field-effect tube, third field-effect tube, the 4th field-effect tube,
DC voltage after the three-phase synchronous rectification bridge rectification that 5th field-effect tube and the 6th field-effect tube are constituted, is input to the first inductance
Become unstabilized DC voltage with the LC filter filtering of first capacitor composition；
Step 3, DC voltage-stabilizing output: the voltage feedback signal of voltage detecting circuit output, which is sent to MCU, MCU, passes through the period
Property detection voltage feedback signal and set voltage value size, come determine output open the 7th field-effect tube or the 8th field-effect tube
Pulse control signal, the pulse control signal of the pulse control signal of the 7th field-effect tube and the 8th field-effect tube constitutes complementary
Output control signal.
The control logic of three-phase current described in step 1 is all the same, and each phase current works independently, and does not interfere with each other.
MCU is by being periodically detected voltage feedback signal and setting the size detailed process of voltage value in step 3:
1. a cycle: voltage feedback signal is less than setting voltage value, and MCU sends the pulse of the 7th field-effect tube of conducting
Control signal PWM7, the conducting of the 7th field-effect tube；PWM7 duty ratio is set as 90%, when reaching 90%, PWM7 and PWM8 are
It closes；
2. second period: voltage feedback signal is less than setting voltage value, still opens the 7th field-effect tube, the 8th effect
It should pipe closing；Voltage feedback signal, which is greater than or equal to, sets voltage value, closes PWM7 output, after PWM7 is closed, introduces one section extremely
Then area's time opens PWM8 and passes through the 8th field-effect tube afterflow；When reaching PWM7 duty ratio 90%, PWM7 and PWM8 are simultaneously
It closes；
3. the third period: voltage feedback signal is greater than or equal to setting voltage value, this period, PWM7 was no longer open-minded, PWM8
Open-minded, circuit is by the 8th field-effect tube afterflow, when reaching at duty ratio 90%, turns off PWM8；
4. the 4th period: voltage feedback signal is less than setting voltage value, and PWM7 is open-minded, and then voltage feedback signal is greater than
Or it is equal to setting voltage value, PWM7 is turned off, is delayed after one section of dead time, opens PWM8, when finally reaching at duty ratio 90%
Close PWM8；
5. period 5 and later repetitive cycling execute the control logic in above-mentioned 1.~4. four period.
Compared with prior art, the beneficial effects brought by the technical solution of the present invention are as follows:
(1) present invention obtains current value by current detection circuit, and according to the conduction threshold of setting, to control respective fields
Effect pipe opens shutdown as rectifier bridge, and then realizes the power supply conversion of wideband three-phase alternating current input, so that power supply conversion is whole
Current circuit remains to work normally in the case where three-phase input frequency transformation；
(2) present invention using controllable MOSFET field-effect tube replace can not fast recovery rectifier diode there is synchronization line afterflow
Effect reduces loss, reduces rectification circuit pipe consumption greatly；Low-voltage, high-current is rectified, especially when voltage is lower,
Utilization rate of the present invention is higher；In addition by field-effect tube parallel shunt, can both make to flow through each field-effect tube electric current reduction in this way
For original half, the pipe consumption consumption for being is smaller.
(3) present invention have to input three-phase input have wideband is adaptive, anti-interference strong, circuit is simply easy to control,
High conversion efficiency, advantage low in energy consumption, calorific value is small.
Detailed description of the invention
Fig. 1 is circuit diagram of the invention；
Fig. 2 is MCU partial circuit diagram in the present invention；
Fig. 3 is that rectification control course of work waveform diagram in side is exchanged in the present invention；
Fig. 4 is that DC side pressure stabilizing controls course of work waveform diagram in the present invention.
Appended drawing reference: GA generator three-phase alternating-current supply；The first field-effect tube of Q1；The second field-effect tube of Q2；Q3 third field
Effect pipe；The 4th field-effect tube of Q4；The 5th field-effect tube of Q5；The 6th field-effect tube of Q6；The 7th field-effect tube of Q7；Q8 the 8th effect
Ying Guan；C1 first capacitor；The second capacitor of C2；The first inductance of L1；The second inductance of L2.
Specific embodiment
The invention will be further described with reference to the accompanying drawing.
As shown in Figure 1, three-phase wideband of the invention exchanges input adaptive circuit of synchronous rectification, including sequentially connected hair
Motor three-phase alternating-current supply GA, current detection circuit, rectified three-phase circuit, DC voltage-stabilizing output circuit and voltage detecting circuit.
The value of the three-phase alternating current of current detection circuit detection input, carries out the three-phase current of generator three-phase alternating-current supply GA output
It samples and is compared and sampled value is perhaps sent into processor MCU according to obtained comparison signal or sampled value progress pulse
The logic control of signal PWM output.Voltage detecting circuit is used to detect the voltage value for exporting direct current component, to output pressure stabilizing and sets
Constant voltage value is relatively or sampling is sent directly into processor MCU and is handled, and controls PWM7, PWM8 according to obtained comparison signal
Open shutdown logic.
Rectified three-phase circuit includes constituting the first field-effect tube Q1 of three-phase synchronous rectification bridge, the second field-effect tube Q2, the
Three field-effect tube Q3, the 4th field-effect tube Q4, the 5th field-effect tube Q5 and the 6th field-effect tube Q6.First field-effect tube
The drain electrode of Q1, third field-effect tube Q3 and the 5th field-effect tube Q5 are both connected to together, common drain end.Second field-effect tube
The source electrode of Q2, the 4th field-effect tube Q4 and the 6th field-effect tube Q6 are both connected to together, common source terminal.The common drain end and altogether
The first inductance L1 and first capacitor C1 is in series between source terminal.The source electrode and the second field-effect tube of the first field-effect tube Q1
The drain electrode of Q2 is connected to the A phase current output end of current detection circuit.The source electrode of the third field-effect tube Q3 and the 4th
The drain electrode of effect pipe Q4 is connected to the B phase current output end of current detection circuit.The source electrode of the 5th field-effect tube Q5 and
The drain electrode of 6th field-effect tube Q6 is connected to the C phase current output end of current detection circuit.The rectified three-phase circuit left side is to hand over
Side is flowed, there are three switch bridge arms, is composed in series on every switch bridge arm there are two field-effect tube, the source electrode of upper field-effect tube is under
The drain electrode of field-effect tube is connected to form switching node.It is DC output side on the right of rectified three-phase circuit, first capacitor C1 is being exported
Between DC voltage is positive and negative.
DC voltage-stabilizing output circuit includes the 7th field-effect tube Q7 and the 8th field-effect for being parallel to the both ends first capacitor C1
Pipe Q8, and the 7th field-effect tube Q7 and the 8th field-effect tube Q8 are serially connected, the drain electrode of the 8th field-effect tube Q8 and source electrode
Between be parallel with the second inductance L2 and the second capacitor C2, and the second inductance L2 and the second capacitor C2 are serially connected, voltage detecting electricity
Road is parallel to the second both ends capacitor C2.The source electrode of the 7th field-effect tube Q7 and the drain series of the 8th field-effect tube Q8 are one
It rises.The drain electrode of 7th field-effect tube Q7 is connected with the upper bridge of three-phase synchronous rectification bridge, in the second inductance L2 and the 8th field-effect tube
Under the opening, turn off of Q8, it is combined into freewheeling circuit.
The three-phase current output end of current detection circuit is connected to the current input terminal of MCU, i.e. i in Fig. 1A、iB、iCPoint
The i not being connected in Fig. 2A、iB、iC.The voltage output end of the voltage detecting circuit is connected to the voltage input end of MCU, that is, schemes
U in 1+, u- be respectively connected to the u in Fig. 2+,u-.The current output terminal of the MCU be respectively connected to the first field-effect tube Q1,
Second field-effect tube Q2, third field-effect tube Q3, the 4th field-effect tube Q4, the 5th field-effect tube Q5 and the 6th field-effect tube Q6
Grid, the voltage output end of the MCU are respectively connected to the grid of the 7th field-effect tube Q7 and the 8th field-effect tube Q8, i.e. Fig. 2
In PWM1, PWM2, PWM3, PWM4, PWM5, PWM6, PWM7, PWM8 be respectively connected to PWM1, PWM2 in Fig. 1, PWM3,
PWM4、PWM5、PWM6、PWM7、PWM8。
Three-phase synchronous rectification bridge controls the opening of three-phase current by receiving the square-wave pulse signal of MCU sending, turns off, and
It is filtered by the first inductance L1 and first capacitor C1 current stabilization.7th field-effect tube Q7, the 8th field-effect tube Q8 are by receiving MCU hair
Square-wave signal out controls outlet side voltage stabilization, the second capacitor C2 and the second inductance L2 and provides filtering for output circuit and continue
Stream.For DC output side, the 7th field-effect tube Q7 drain electrode, the second inductance L2 and the second capacitor C2 are flowed into after rectifying and wave-filtering
With the 8th field-effect tube Q8, together control circuit afterflow.Wherein, shutdown point is opened by PWM7, controls voltage output size.Institute
State the first field-effect tube Q1, the second field-effect tube Q2, third field-effect tube Q3, the 4th field-effect tube Q4, the 5th field-effect tube Q5,
6th field-effect tube Q6, the 7th field-effect tube Q7 and the 8th field-effect tube Q8 are all made of N-type MOSFET field-effect tube.
The control method of above-mentioned three-phase wideband exchange input adaptive circuit of synchronous rectification, comprising the following steps:
(1) three phase rectifier
The power supply of generator three-phase alternating-current supply can will test after current detection circuit has detected electric current input
Three-phase electricity flow valuve gives MCU respectively, and three-phase electricity flow valuve is compared with given threshold respectively: if a certain phase current values are greater than just
Given threshold i >+Ith, the then field-effect tube that MCU is connected to source electrode with the phase current output end send the pulse letter opened
Number, this field-effect tube is connected；If a certain phase current values are less than negative given threshold i <-Ith, MCU to drain electrode and the phase current
The field-effect tube that output end is connected sends the pulse signal opened, this field-effect tube is connected；If a certain phase current values are in
M- Ith≤i≤+ Ith of positive given threshold and negative given threshold, then MCU is not to two to be connected with the phase current output end
A field-effect tube sends the pulse signal opened, and passes through the parasitic diode incoming flow overcurrent of this two field-effect tube.
Fig. 3 is conceptual to be described when energy is inputted from exchange side, and field-effect tube opens shutdown operation waveform, wherein
PWM1, PWM2, PWM3, PWM4, PWM5, PWM6 are respectively the first field-effect tube Q1 of the exchange side corresponding to it, second effect
Should pipe Q2, third field-effect tube Q3, the 4th field-effect tube Q4, the 5th field-effect tube Q5, the 6th field-effect tube Q6 grid control
Signal waveform.
Traditional three-phase alternating current full-wave rectification technology is highly developed, for known to the worker of the field, just not thin
It states.The present invention field-effect tube controllable using on-off, realizes the control to current rectification in conjunction with control MCU and current detecting.
For A phase in three-phase alternating current input, PWM1 and PWM2 cannot be open-minded simultaneously, remaining two-phase working mechanism is identical.
By taking the input of A phase current as an example, when A phase current sensing is to after having electric current input, the current value that can be will test is given
Then current value is compared by processor MCU with positive given threshold+Ith.If current value is greater than+Ith, then MCU can be sent
The first field-effect tube Q1 is connected in the pulse signal PWM1 for opening the first field-effect tube Q1.For A phase lower bridge arm, if electric current
Value is greater than≤- Ith, then MCU can send the pulse signal PWM2 for opening the second field-effect tube Q2, lead the second field-effect tube Q2
It is logical.If current value is in-Ith≤iAIn≤+ Ith range, then the pulse signal PWM1 of the first field-effect tube Q1 of conducting is not sent
With the pulse signal PWM2 of the second field-effect tube Q2, pass through the parasitic diode of the first field-effect tube Q1 and the second field-effect tube Q2
Incoming flow overcurrent.In this way, realizing the purpose of input synchronous rectification.As shown in current waveform Fig. 3.
The method of another given threshold is realized by hardware window comparator circuit, when current value is set greater than hardware
When fixed current threshold, the logical signal after comparison is at this moment passed into MCU, and then control the open-minded of PWM1, when current value is small
When the current threshold of hardware setting, the logical signal after comparison is at this moment passed into MCU, and then control the shutdown of PWM1.Its
Its Controlled by Two-Phase logic is identical as A phase current.Each phase current can regard independent as and work, not interfere with each other.This just makes
Obtaining rectification circuit has whose external input power frequency to change adaptive ability with.
Compared with conventional diode tube voltage drop is as rectifier bridge, the present invention is the conduction threshold according to setting, controlling filed effect
Should pipe on-off as rectifier bridge.Such as traditional pressure-resistant 300V diode rectifier circuit, diode drop UFRepresentative value is in 1.4V
More than, conducting resistance R representative value 12m Ω of field-effect tube or so.For electric current I to flow through rectifying tube is 50A, for common
Diode pipe consumption: PDiode=UD* I=1.4*50=70W.For the present invention, field-effect tube pipe consumption: PMosfet=I2* R=50*
50*0.012=30W.Thus, it can be seen that the present invention reduces rectification circuit pipe consumption greatly.Low-voltage, high-current is rectified, especially
It is when voltage is lower, utilization rate of the present invention is higher.In addition, the present invention can be by field-effect tube parallel shunt, it so both can be with
Make to flow through each field-effect tube electric current and be reduced to original half, the pipe consumption consumption for being is smaller.
(2) it filters
By the first field-effect tube Q1, the second field-effect tube Q2, third field-effect tube Q3, the 4th field-effect tube Q4, the 5th
DC voltage after the three-phase synchronous rectification bridge rectification that field-effect tube Q5 and the 6th field-effect tube Q6 is constituted, is input to the first inductance
The LC filter filtering of L1 and first capacitor C1 composition becomes unstabilized DC voltage UC1。
(3) DC voltage-stabilizing exports
DC voltage-stabilizing output control method is as shown in figure 4, voltage feedback signal Uout gives processor MCU.Direct current output
Side working mechanism, when normal work, processor MCU can be with opposite with the pulse of fixed frequency and fixed duty cycle, PWM8
Signal input makes circuit afterflow in PWM7 shutdown.When detecting that voltage is higher than setting output valve, turn off PWM7's
Pulse input.When lower than setting voltage value, PWM7 is open-minded.Short circuit in order to prevent after PWM7 shutdown, increases certain time-delay and opens
Logical PWM8；When PWM7 is opened, PWM8 is turned off in advance, ensures that circuit reliability service in this way.
The voltage feedback signal of voltage detecting circuit output, which is sent to MCU, MCU, passes through periodically (cycle time T) detection electricity
Press feedback signal Uout and setting value Uset (setting reference output voltage value), come determine output open the 7th field-effect tube Q7 or
The pulse control signal of 8th field-effect tube Q8.The pulse control signal of 7th field-effect tube Q7 and the arteries and veins of the 8th field-effect tube Q8
Punching control signal constitutes complementary output and controls signal, in order to protect the 7th field-effect tube Q7 or the 8th field-effect tube Q8 not to generate altogether
Admittance causes damage, it is necessary to have dead time, detailed process:
1. a cycle: at S0, voltage feedback signal is less than setting voltage value, and Uout < Uset, MCU send conducting
The pulse control signal PWM7 of 7th field-effect tube Q7, the 7th field-effect tube Q7 conducting.PWM7 duty ratio is set as 90%, when arriving
When up to 90%, still there is Uout < Uset, PWM7 and PWM8 are closed at this time.
2. second period: since a cycle does not make voltage reach setting value, at second period S1, still having
Voltage feedback signal is less than setting voltage value, and Uout < Uset still opens PWM7, and PWM8 is closed, and opens the 7th field-effect tube
Q7, the 8th field-effect tube Q8 are closed.At S5, voltage feedback signal, which is greater than or equal to, sets voltage value, Uout >=Uset, at this time
PWM7 output is closed, since hardware delay and inductance there are voltage continue to rise.7th field-effect tube Q7 or in order to prevent
Eight field-effect tube Q8 are common to cause field-effect tube to be damaged, and after PWM7 is closed, introduces one section of dead time, then opens PWM8 and pass through
8th field-effect tube afterflow.When reaching PWM7 duty ratio 90%, PWM7 and PWM8 are simultaneously closed off.
3. the third period: at S2, voltage value is set since voltage feedback signal is greater than or equal to, Uout >=Uset, because
This this period, PWM7 was no longer open-minded, and in order to guarantee afterflow, PWM8 is open-minded, and circuit passes through the 8th field-effect tube Q8 afterflow.Reaching
When at duty ratio 90%, PWM8 is turned off.
4. the 4th period: at S3, voltage feedback signal is less than setting voltage value, Uout < Uset, therefore PWM7 is open-minded,
When reaching at S7, voltage feedback signal is greater than or equal to setting voltage value, and Uout >=Uset turns off PWM7, and be delayed one section of dead zone
After time, PWM8 is opened.PWM8 is closed when finally reaching at duty ratio 90%.
5. period 5 and later repetitive cycling execute the control logic in above-mentioned 1.~4. four period.
The technical program has developed matured product, according to the description of embodiment, other those skilled in the art
It is easy to accomplish.Embodiments described above is only schematical, wherein the unit as illustrated by the separation member can be with
It is or may not be and be physically separated, component shown as a unit may or may not be physical unit,
Can be in one place, or may be distributed over multiple network units.It can select according to the actual needs wherein
Some or all of the modules achieve the purpose of the solution of this embodiment.Those of ordinary skill in the art are not paying creativeness
In the case where labour, it can understand and implement.
Through the above description of the embodiments, those skilled in the art can be understood that each embodiment can
It realizes by means of software and necessary general hardware platform, naturally it is also possible to pass through hardware.Based on this understanding, on
Stating technical solution, substantially the part that contributes to existing technology can be embodied in the form of software products in other words, should
Computer software product may be stored in a computer readable storage medium, such as ROM/RAM, magnetic disk, CD, including several fingers
It enables and using so that a computer equipment (can be personal computer, server or the network equipment etc.) executes each implementation
Method described in certain parts of example or embodiment.
The aforementioned description to specific exemplary embodiment of the invention is in order to illustrate and illustration purpose.These descriptions
It is not wishing to limit the invention to disclosed precise forms, and it will be apparent that according to the above instruction, can much be changed
And variation.The purpose of selecting and describing the exemplary embodiment is that explaining specific principle of the invention and its actually answering
With so that those skilled in the art can be realized and utilize a variety of different exemplary implementation schemes of the invention and
Various chooses and changes.The scope of the present invention is intended to be limited by claims and its equivalents.
Claims (7)
1. a kind of three-phase wideband exchanges input adaptive circuit of synchronous rectification, including sequentially connected generator three-phase alternating current
Source, current detection circuit and voltage detecting circuit, which is characterized in that connect between the current detection circuit and voltage detecting circuit
It is connected to rectified three-phase circuit and DC voltage-stabilizing output circuit；
The rectified three-phase circuit includes the first field-effect tube, the second field-effect tube, third field for constituting three-phase synchronous rectification bridge
Effect pipe, the 4th field-effect tube, the 5th field-effect tube and the 6th field-effect tube, first field-effect tube, third field-effect tube
Drain electrode with the 5th field-effect tube is both connected to together, common drain end；Second field-effect tube, the 4th field-effect tube and the 6th
The source electrode of field-effect tube is both connected to together, common source terminal；The first inductance is in series between the common drain end and common source terminal
And first capacitor；
The DC voltage-stabilizing output circuit includes the 7th field-effect tube and the 8th field-effect tube for being parallel to first capacitor both ends, and
7th field-effect tube and the 8th field-effect tube are serially connected, and are parallel with second between the drain electrode and source electrode of the 8th field-effect tube
Inductance and the second capacitor, and the second inductance and the second capacitor are serially connected, voltage detecting circuit is parallel to the second capacitor both ends；
The three-phase current output end of the current detection circuit is connected to the current input terminal of MCU, the voltage detecting circuit
Voltage output end is connected to the voltage input end of MCU, and the current output terminal of the MCU is respectively connected to the first field-effect tube,
The grid of two field-effect tube, third field-effect tube, the 4th field-effect tube, the 5th field-effect tube and the 6th field-effect tube, the MCU
Voltage output end be respectively connected to the grid of the 7th field-effect tube and the 8th field-effect tube.
2. three-phase wideband according to claim 1 exchanges input adaptive circuit of synchronous rectification, which is characterized in that described the
The drain electrode of the source electrode of one field-effect tube and the second field-effect tube is connected to the A phase current output end of current detection circuit；It is described
The drain electrode of the source electrode of third field-effect tube and the 4th field-effect tube is connected to the B phase current output end of current detection circuit；Institute
The drain electrode of the source electrode and the 6th field-effect tube of stating the 5th field-effect tube is connected to the C phase current output end of current detection circuit.
3. three-phase wideband according to claim 1 exchanges input adaptive circuit of synchronous rectification, which is characterized in that described the
The source electrode of seven field-effect tube and the drain series of the 8th field-effect tube are together.
4. three-phase wideband according to claim 1 exchanges input adaptive circuit of synchronous rectification, which is characterized in that described the
One field-effect tube, the second field-effect tube, third field-effect tube, the 4th field-effect tube, the 5th field-effect tube, the 6th field-effect tube,
7th field-effect tube and the 8th field-effect tube are all made of N-type MOSFET field-effect tube.
5. the control method of the three-phase wideband exchange input adaptive circuit of synchronous rectification of the claims 1 to 4, feature
It is, comprising the following steps:
Step 1, three phase rectifier: the power supply of generator three-phase alternating-current supply, after current detection circuit has detected electric current input,
The three-phase electricity flow valuve that can be will test gives MCU respectively, and three-phase electricity flow valuve is compared with given threshold respectively: if a certain phase
Current value is greater than positive given threshold i >+Ith, then the field-effect tube transmission that MCU is connected to source electrode with the phase current output end is opened
This field-effect tube is connected in logical pulse signal；If a certain phase current values are less than negative given threshold i <-Ith, MCU to drain electrode
The field-effect tube being connected with the phase current output end sends the pulse signal opened, this field-effect tube is connected；If a certain phase
Current value is in m- Ith≤i≤+ Ith of positive given threshold and negative given threshold, then MCU not to the phase current output end
Two field-effect tube being connected send the pulse signal opened, and flow through electricity by the parasitic diode of this two field-effect tube
Stream.
Filtering: step 2 passes through the first field-effect tube, the second field-effect tube, third field-effect tube, the 4th field-effect tube, the 5th
DC voltage after the three-phase synchronous rectification bridge rectification that field-effect tube and the 6th field-effect tube are constituted is input to the first inductance and the
The LC filter filtering of one capacitor composition becomes unstabilized DC voltage；
Step 3, DC voltage-stabilizing output: the voltage feedback signal of voltage detecting circuit output, which is sent to MCU, MCU, passes through periodically inspection
It surveys voltage feedback signal and sets the size of voltage value, to determine that the arteries and veins of the 7th field-effect tube or the 8th field-effect tube is opened in output
Punching control signal, the pulse control signal of the 7th field-effect tube and the pulse control signal of the 8th field-effect tube constitute complementary output
Control signal.
6. the control method of three-phase wideband exchange input adaptive circuit of synchronous rectification according to claim 5, feature
It is, the control logic of three-phase current described in step 1 is all the same, and each phase current works independently, and does not interfere with each other.
7. the control method of three-phase wideband exchange input adaptive circuit of synchronous rectification according to claim 5, feature
It is, MCU is by being periodically detected voltage feedback signal and setting the size detailed process of voltage value in step 3:
1. a cycle: voltage feedback signal is less than setting voltage value, and MCU sends the pulse control of the 7th field-effect tube of conducting
Signal PWM7, the conducting of the 7th field-effect tube；PWM7 duty ratio is set as 90%, when reaching 90%, PWM7 and PWM8 are closed；
2. second period: voltage feedback signal is less than setting voltage value, still opens the 7th field-effect tube, the 8th field-effect tube
It closes；Voltage feedback signal is greater than or equal to setting voltage value, PWM7 output is closed, after PWM7 is closed, when introducing one section of dead zone
Between, it then opens PWM8 and passes through the 8th field-effect tube afterflow；When reaching PWM7 duty ratio 90%, PWM7 and PWM8 are closed simultaneously
It closes；
3. the third period: voltage feedback signal is greater than or equal to setting voltage value, this period, PWM7 was no longer open-minded, and PWM8 is opened
Logical, circuit is by the 8th field-effect tube afterflow, when reaching at duty ratio 90%, turns off PWM8；
4. the 4th period: voltage feedback signal is less than setting voltage value, and PWM7 is open-minded, and then voltage feedback signal is greater than or waits
In setting voltage value, PWM7 is turned off, is delayed after one section of dead time, opens PWM8, closed when finally reaching at duty ratio 90%
PWM8；
5. period 5 and later repetitive cycling execute the control logic in above-mentioned 1.~4. four period.
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| CN201710635857.4A CN109327151B (en) | 2017-07-31 | 2017-07-31 | Three-phase broadband alternating current input self-adaptive synchronous rectification circuit and control method |
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| CN109327151B CN109327151B (en) | 2021-04-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111934569A (en) * | 2020-06-30 | 2020-11-13 | 贵州航天林泉电机有限公司 | Pulse power supply converter for supplying power to high-speed generator and conversion method thereof |
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| CN101783594A (en) * | 2010-02-26 | 2010-07-21 | 东南大学 | Isolated high-light load efficiency low-output voltage high-current switch power source |
| CN102097963A (en) * | 2011-01-18 | 2011-06-15 | 江苏省电力公司常州供电公司 | Three-phase full-controlled rectifying device and rectifying and current-limiting method thereof |
| CN103683982A (en) * | 2014-01-03 | 2014-03-26 | 哈尔滨工业大学 | Wide-range alternating voltage input Buck structure voltage-stabilized source |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101783594A (en) * | 2010-02-26 | 2010-07-21 | 东南大学 | Isolated high-light load efficiency low-output voltage high-current switch power source |
| CN102097963A (en) * | 2011-01-18 | 2011-06-15 | 江苏省电力公司常州供电公司 | Three-phase full-controlled rectifying device and rectifying and current-limiting method thereof |
| CN103683982A (en) * | 2014-01-03 | 2014-03-26 | 哈尔滨工业大学 | Wide-range alternating voltage input Buck structure voltage-stabilized source |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111934569A (en) * | 2020-06-30 | 2020-11-13 | 贵州航天林泉电机有限公司 | Pulse power supply converter for supplying power to high-speed generator and conversion method thereof |
| CN111934569B (en) * | 2020-06-30 | 2023-07-28 | 贵州航天林泉电机有限公司 | Pulse power converter for supplying power to high-speed generator and conversion method thereof |
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