CN205622535U - Take rectifier of hysteresis comparison function - Google Patents
Take rectifier of hysteresis comparison function Download PDFInfo
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- CN205622535U CN205622535U CN201620434345.2U CN201620434345U CN205622535U CN 205622535 U CN205622535 U CN 205622535U CN 201620434345 U CN201620434345 U CN 201620434345U CN 205622535 U CN205622535 U CN 205622535U
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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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Abstract
The utility model discloses a take rectifier of hysteresis comparison function, including main circuit, detection circuitry and control circuit, the main circuit links to each other with the load, and control circuit links to each other with the main circuit including the hysteresis loop comparing element, signal processing unit, treater, the power tube drive unit that concatenate in proper order, detection circuitry's input, and detection circuitry's output links to each other with hysteresis loop comparing element's input, and power tube drive unit's output links to each other with the main circuit. Detection circuitry gathers the magnitude of voltage of two electric capacity about magnitude of voltage and the direct current side of current value, the direct current output side of rectifier three -phase input and sends into hysteresis loop comparing element, and hysteresis loop comparing element output signal to treater obtains the switching signal of power switch pipe, and power tube drive unit drive switching tube break -make reaches the purpose of regulated output voltage, balanced mid point voltage, have simply easy realize, the effectual characteristics of control.
Description
Technical field
This utility model relates to electric and electronic technical field, particularly to the rectification of a kind of band sluggishness comparing function
Device.
Background technology
The most a lot of power electronic equipments have brought many facilities in transformation of electrical energy application aspect, but same
Time also bring serious harmonic wave and idle pollution, if Harmonics of Input content can be reduced, then to improvement
The performance of commutator, the power factor of raising system have very important significance.Therefore, research high power
The fairing of factor and low harmony wave has become one popular direction of field of power electronics.VIENNA rectifier
Have power factor height, input current Thdi is low, switching device is few, high reliability, to it deeply
Research tool has very important significance.There is the problem of midpoint fluctuation, midpoint waveform in tradition VIENNA rectifier
Can bring harmonic wave, therefore it is the most urgent to study a kind of control method balancing mid-point voltage.
Summary of the invention
In order to solve above-mentioned technical problem, this utility model provides a kind of simple in construction, can balance mid-point voltage
The commutator of band sluggishness comparing function.
This utility model solves the technical scheme of the problems referred to above: the commutator of a kind of band sluggishness comparing function,
Including main circuit, testing circuit and control circuit, described main circuit is connected with load, described control circuit bag
Include be sequentially connected in series stagnant ring comparing unit, signal processing unit, processor, power tube driver element, described
The input of testing circuit is connected with main circuit, the outfan of testing circuit and the input of stagnant ring comparing unit
Being connected, the outfan of described power tube driver element is connected with main circuit.
In the commutator of above-mentioned band sluggishness comparing function, described main circuit includes that the three-phase input being sequentially connected in series is single
Unit, light-coupled isolation unit, rectification filtering unit, pressure unit, pressure unit is connected with load.
In the commutator of above-mentioned band sluggishness comparing function, described testing circuit include three-phase voltage sampling unit,
Three-phase current sampling unit and direct current output sampling unit, the input of described three-phase voltage sampling unit and light
The outfan of coupling isolated location is connected, the outfan of three-phase voltage sampling unit and the input of stagnant ring comparing unit
End is connected, and the input of three-phase current sampling unit is connected with the outfan of light-coupled isolation unit, three-phase current
The outfan of sampling unit is connected with the input of stagnant ring comparing unit, the input of direct current output sampling unit
It is connected with the outfan of pressure unit, the outfan of direct current output sampling unit and the input of stagnant ring comparing unit
End is connected.
In the commutator of above-mentioned band sluggishness comparing function, described control circuit also include overvoltage detection unit and
The outfan of excessive current detection unit, the input of described overvoltage detection unit and three-phase voltage sampling unit
Being connected, the outfan of overvoltage detection unit is connected with processor, the input of excessive current detection unit and three
The outfan of phase current sampling unit is connected, and the outfan of excessive current detection unit is connected with processor.
In the commutator of above-mentioned band sluggishness comparing function, it is additionally provided with between described signal processing unit and processor
Signal clamper protected location.
The beneficial effects of the utility model are: testing circuit of the present utility model gathers the input of commutator three-phase
The magnitude of voltage of upper and lower two electric capacity of current value, the magnitude of voltage of DC output side and DC side of end, then will adopt
Collection arrive output voltage values, the current value of input side, the upper and lower electric capacity of DC side magnitude of voltage send into stagnant chain rate relatively
Unit, last stagnant chain rate relatively element output signal, to processor, obtains the switching signal of power switch pipe, merit
Rate pipe drive unit drives switching tube break-make, reaches regulated output voltage, the purpose of balance mid-point voltage, tool
Have and simply easily realize, control effective feature.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present utility model.
Fig. 2 is the topology diagram of main circuit in Fig. 1.
Fig. 3 is the circuit diagram of three-phase voltage sampling unit in Fig. 1.
Fig. 4 is the circuit diagram of three-phase current sampling unit in Fig. 1.
Fig. 5 is the circuit diagram of direct current output sampling unit in Fig. 1.
Fig. 6 is the circuit diagram of stagnant ring comparing unit in Fig. 1.
Fig. 7 is the different operating state diagram signal under this utility model Hysteresis control.
Fig. 8 is this utility model DC side output voltage, net side phase voltage current simulations oscillogram.
Fig. 9 is the analogous diagram of this utility model DC output side two electric capacity both end voltage.
Detailed description of the invention
With embodiment, this utility model is further described below in conjunction with the accompanying drawings.
As it is shown in figure 1, this utility model includes main circuit, testing circuit and control circuit.
Three-phase input block that described main circuit includes being sequentially connected in series, light-coupled isolation unit, rectification filtering unit,
Pressure unit, pressure unit is connected with load.
Described control circuit includes that the stagnant ring comparing unit being sequentially connected in series, signal processing unit, signal clamper are protected
Protecting unit, processor, power tube driver element, processor uses dsp controller, described testing circuit
Input is connected with main circuit, and the outfan of testing circuit is connected with the input of stagnant ring comparing unit, described
The outfan of power tube driver element is connected with pressure unit.Described control circuit also includes Zenith tracking list
Unit and excessive current detection unit, the input of described overvoltage detection unit is defeated with three-phase voltage sampling unit
Going out end to be connected, the outfan of overvoltage detection unit is connected with processor, the input of excessive current detection unit
Being connected with the outfan of three-phase current sampling unit, the outfan of excessive current detection unit is connected with processor.
Described testing circuit includes three-phase voltage sampling unit, three-phase current sampling unit and direct current output sampling
Unit, the input of described three-phase voltage sampling unit is connected with the outfan of light-coupled isolation unit, three-phase electricity
The outfan of pressure sampling unit is connected with the input of stagnant ring comparing unit, the input of three-phase current sampling unit
End is connected with the outfan of light-coupled isolation unit, the outfan of three-phase current sampling unit and stagnant ring comparing unit
Input be connected, direct current output sampling unit input be connected with the outfan of pressure unit, direct current is defeated
The input of the outfan and stagnant ring comparing unit that go out sampling unit is connected.
Fig. 2 is main circuit topological structure figure, and wherein Ua, Ub, Uc are three-phase alternating current input voltage, and Ls is
Input inductance, Sa, Sb, Sc are power-type device mosfet, and D1, D4 are up and down the two 2 of A phase brachium pontis
Pole is managed, and D2, D5 are two diode up and down of B phase brachium pontis, and D3, D6 are two 2 pole up and down of C phase brachium pontis
Pipe, C1, C2 are upper and lower two electric capacity of outfan, and R1, R2 play all pressure effects for being connected in parallel on C1, C2 two ends
Two equalizing resistances, Udc is DC side output voltage, and Rout is load resistance.
Fig. 3 is the circuit diagram of this utility model three-phase voltage sampling unit, and wherein three-phase input voltage U phase is passed through
Resistance R11 with R12 connects ground connection, makes R12 dividing potential drop obtain n times (n < 1) by the resistance arranging R11 Yu R12
U phase voltage, as the input signal of first LF353MX amplifier, owing to U phase voltage containing high-frequency harmonic,
Therefore before it inputs, add electric capacity C11 and resistance R13 constitute RC wave filter, filter out from doing that civil power is mingled with
Disturbing signal, LF353MX amplifier is powered by+a 5V and-a 5V, and electric capacity C12 and C13 is filter equally
Ripple, the effect of first amplifier LF353MX is exactly voltage follow isolation, the electricity that can identify due to dsp chip
Pressure scope is 0-3,3V, therefore needs to process before input dsp chip, owing to the left end of R14 now is believed
Number being the peak value sinusoidal signal less than 3V, signal has negative value, now by adding+3V voltage by it
Low spot is drawn high on null value, now obtains a sinusoidal signal ripple above x-axis, second amplifier
LM353MX is the effect following isolation equally, and resistance R16 and electric capacity C14 constitutes RC filtering, obtains last
Signal is for dsp chip identifying processing.
Fig. 4 is the circuit diagram of this utility model three-phase current sampling unit, wherein series connection one in U phase input line
Individual power resistor (diverter), power resistor two ends are numbered U1 and U2 ,+5V respectively and are
HCPL-7840-300E chip power supply, electric capacity C21 Yu C23 is the filtering of+5V power supply so that chip operation
More stable, resistance R21 forms RC wave filter, HCPL-7840-300E chip with electric capacity C22 series connection ground
The effect played is a light-coupled isolation and the effect of a signal amplification, and signal amplification factor is 8 times, resistance
R24 and electric capacity C24 constitutes RC parallel filter, and resistance R22, R23, R25 are first amplifier LF353MX
Constituting the amplification of difference amplifier, amplification is R25/R23 (R22), electric capacity C25, C26, C27
Being all filter capacitor, the effect of second amplifier LF353MX is voltage follow, also functions to the work of isolation simultaneously
With, the voltage range that can identify due to dsp chip is 0-3,3V, therefore needs to do and locate before input dsp chip
Reason, owing to the left end signal of R27 now is the peak value sinusoidal signal less than 3V, signal has negative value, this
In time, draw high on null value by its minimum point by adding+3V voltage, just now obtains one above x-axis
String signal ripple, resistance R29 and electric capacity C28 constitutes RC wave filter, and the effect of the 3rd amplifier LM353MX is
Signal is followed and isolates, and electric capacity C29 and electric capacity C210 are the power supply filter capacitor of its amplifier, resistance R210 with
Electric capacity C211 constitutes RC wave filter, filters the high-frequency interferencing signal of output signal.
Fig. 5 is the circuit diagram of this utility model direct current output sampling unit, and wherein electric capacity C31 is connected in parallel on output electricity
Between pressure Udc and ground, filtering the interference signal being mingled with in output voltage, electric capacity C32 and resistance R33 constitutes RC
Wave filter, resistance R31, R32, R34 constitute the amplification of the differential signal of amplifier LF353MX, amplify
Multiple is R4/R1 (R2), and by suitable amplification (amplification is less than 1), this big voltage is obtained one
Signal between individual 0-3.3V, electric capacity, 34, C35 be the filter capacitor of+5V power supply of amplifier LF353MX,
Resistance R35 and electric capacity C36 constitutes RC wave filter, filters the High-frequency Interference of the signal of last output.
Fig. 6 is the circuit diagram of this utility model stagnant ring comparing unit, and wherein Δ ia is by outer voltage, electric current
Obtaining final signal after internal ring, mid-point voltage compensation deals, LM393 is comparator, above comparator+end
With following comparator-end link together, constitute hysteresis comparator input, resistance R41, R43,
Resistance R42, R44 constitute the stagnant ring upper limit size of hysteresis comparator and stagnant ring lower limit size, are triggered by SR
Device from Q end export, this signal constitute nor gate MC14081BDR2G an input, another input by
Follow the dynamic waveshape signal of three-phase voltage by what phaselocked loop process three-phase input voltage obtained, finally obtain
The driving signal of power switch pipe.
Operation principle of the present utility model is as follows:
Step one: testing circuit gathers input side rectifier three-phase current, outlet side DC voltage and outlet side
The magnitude of voltage of upper and lower two electric capacity；
Step 2: utilize outlet side DC voltage as feeding back the difference conduct obtained of making comparisons with reference voltage
Outer voltage PI control signal, then this control signal is processed input current internal ring, simultaneously by collecting
Three-phase input current also serve as current inner loop control input signal, additionally, due to need consider midpoint electricity
Pressure balanced, the magnitude of voltage introducing outlet side two electric capacity is defeated after after the recovery remakes scaling process, amplitude limiting processing
Entering current inner loop control, current inner loop controller output signal is the switching signal of power switch pipe Mosfet.
The effect output voltage stabilization reached, neutral point voltage balance.
Step 2 detailed process is: uses typical case's type-Ⅱ system to carry out the outer ring controller of design voltage, obtains voltage
Outer shroud transmission function Gs,
In above formula, T is the inertia time constant of components and parts, KpFor pi regulator scale parameter, KiFor
The integral parameter of pi regulator, C is the value of voltage output end electric capacity, and S is multiple parameter.
And middle frequency range is defined as:
Consider Immunity Performance and the trace performance of outer voltage, general value h in engineering practicev=5.
Can be obtained by typical case's type-Ⅱ system attitude conirol relation:
Inertia time constant T value is 1.78 × 10-8, the value of electric capacity C is 2mF.
Current inner loop controls to use a nonlinear stagnant ring comparing unit as control and regulation device, Hysteresis control
Ring width h choose the frequency needing to consider grid side harmonic wave and switch, the value of h is the least, net side electricity
Though the harmonic wave of stream reduces, but switching frequency is high, and owing to being limited by device performance, switching frequency can not be the highest,
Needing suitably to choose, the value of general h chooses equation below:
H ＞ Udc*T/(18L)
In above formula: T is the sampling period；L is input inductance.
Consider neutral point voltage balance, introduce additional parameter icp=k* Δ Uc, UcFor exporting the difference of two series capacitances,
K is penalty coefficient, obtain stagnant chain rate compared with switching logic expression formula as follows:
S in formulaj1、Sj2(j=a, b c) are expressed as a phase, b phase, the on off state of c phase, ijIt is expressed as
The input current sampled,Being expressed as the reference current after outer voltage is adjusted, h is expressed as hysteresis band.
Fig. 7 is the different operating state under Hysteresis control, (1) UaDuring ＞ 0, whenTime, upper ratio
Relatively device outfan is 0, and lower comparator output terminal is 1, i.e. set-reset flip-floop S=0, R=1, obtains Q=1, Q
For input switch pipe switching signal, i.e. S=1, switching tube is open-minded；WhenTime, upper comparator is defeated
Going out end is 1, and lower comparator output terminal is 0, i.e. set-reset flip-floop S=1, R=0, obtains Q=0, Q for input
Switching tube switching signal, i.e. S=0, switching tube turns off；WhenValue when being between-h and h, s
Upper comparator output terminal is 0, and lower comparator output terminal is 0, i.e. set-reset flip-floop S=0, R=0, now for protecting
Holding state, output kept the value in a upper moment.
This switching logic analyzes the electric current stream that can obtain each state clearly from VIENNA topological structure
To, illustrate as a example by A phase, it is stipulated that electric current positive direction is to flow into the direction of switching tube, is analyzed as follows:
(1)UaDuring ＞ 0, switching tube S1Conducting, switching tube S2Anti-parallel diodes conducting, now inductance
Energy storage, inductive current increases, when increasing to stagnant ring higher limitTime, switching tube S1Turning off, inductance leads to
Cross brachium pontis diode pair C on brachium pontis1Charging and to load supplying, now inductive current reduces, when being reduced to stagnant ring
Lower limitTime, S1Again turn on.
(2)UaDuring ＜ 0, switching tube S2Conducting, switching tube S1Anti-parallel diodes conducting, now inductive energy storage,
Inductive current reduces, when being reduced to stagnant ring lower limitTime, switching tube S2Turning off, inductance passes through brachium pontis
Upper brachium pontis diode pair C2Charging and to load supplying, now inductive current increases, when increasing to stagnant ring higher limitTime, S2Again turn on.
Fig. 8, Fig. 9 are DC side output voltage, net side phase voltage current simulations waveform and DC output side two electricity
The voltage simulation waveform figure held, from simulation waveform, after Hysteresis control, current total harmonic content
THD=2.23%, net side power factor PF=99.93%, input line voltage phase current waveform is followed basically identical.
Outlet side two capacitance voltage is approximately the same, controls effect preferable.
Claims (5)
1. the commutator of a band sluggishness comparing function, it is characterized in that: include main circuit, testing circuit and control circuit, described main circuit is connected with load, stagnant ring comparing unit that described control circuit includes being sequentially connected in series, signal processing unit, processor, power tube driver element, the input of described testing circuit is connected with main circuit, the outfan of testing circuit is connected with the input of stagnant ring comparing unit, and the outfan of described power tube driver element is connected with main circuit.
The commutator of band sluggishness comparing function the most according to claim 1, it is characterised in that: three-phase input block that described main circuit includes being sequentially connected in series, light-coupled isolation unit, rectification filtering unit, pressure unit, pressure unit is connected with load.
The commutator of band sluggishness comparing function the most according to claim 2, it is characterized in that: described testing circuit includes three-phase voltage sampling unit, three-phase current sampling unit and direct current output sampling unit, the input of described three-phase voltage sampling unit is connected with the outfan of light-coupled isolation unit, the outfan of three-phase voltage sampling unit is connected with the input of stagnant ring comparing unit, the input of three-phase current sampling unit is connected with the outfan of light-coupled isolation unit, the outfan of three-phase current sampling unit is connected with the input of stagnant ring comparing unit, the input of direct current output sampling unit is connected with the outfan of pressure unit, the outfan of direct current output sampling unit is connected with the input of stagnant ring comparing unit.
The commutator of band sluggishness comparing function the most according to claim 3, it is characterized in that: described control circuit also includes overvoltage detection unit and excessive current detection unit, the input of described overvoltage detection unit is connected with the outfan of three-phase voltage sampling unit, the outfan of overvoltage detection unit is connected with processor, the input of excessive current detection unit is connected with the outfan of three-phase current sampling unit, and the outfan of excessive current detection unit is connected with processor.
The commutator of band sluggishness comparing function the most according to claim 4, it is characterised in that: it is additionally provided with signal clamper protected location between described signal processing unit and processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620434345.2U CN205622535U (en) | 2016-05-12 | 2016-05-12 | Take rectifier of hysteresis comparison function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620434345.2U CN205622535U (en) | 2016-05-12 | 2016-05-12 | Take rectifier of hysteresis comparison function |
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| CN205622535U true CN205622535U (en) | 2016-10-05 |
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| CN201620434345.2U Expired - Fee Related CN205622535U (en) | 2016-05-12 | 2016-05-12 | Take rectifier of hysteresis comparison function |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111682770A (en) * | 2020-06-18 | 2020-09-18 | 中南大学 | Primary side current sampling double closed-loop digital control method of active clamping forward converter |
| CN112350594A (en) * | 2020-10-21 | 2021-02-09 | 南方电网数字电网研究院有限公司 | Switching circuit, power supply equipment and electrical equipment |
| CN113964863A (en) * | 2021-10-09 | 2022-01-21 | 浙江大学 | Series photovoltaic system capable of automatically achieving module level turn-off |
-
2016
- 2016-05-12 CN CN201620434345.2U patent/CN205622535U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111682770A (en) * | 2020-06-18 | 2020-09-18 | 中南大学 | Primary side current sampling double closed-loop digital control method of active clamping forward converter |
| CN112350594A (en) * | 2020-10-21 | 2021-02-09 | 南方电网数字电网研究院有限公司 | Switching circuit, power supply equipment and electrical equipment |
| CN113964863A (en) * | 2021-10-09 | 2022-01-21 | 浙江大学 | Series photovoltaic system capable of automatically achieving module level turn-off |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161005 Termination date: 20170512 |