CN206820538U - Three arm rectification adversers concatenate load type UPS circuits - Google Patents
Three arm rectification adversers concatenate load type UPS circuits Download PDFInfo
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- CN206820538U CN206820538U CN201720334814.8U CN201720334814U CN206820538U CN 206820538 U CN206820538 U CN 206820538U CN 201720334814 U CN201720334814 U CN 201720334814U CN 206820538 U CN206820538 U CN 206820538U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/30—Reactive power compensation
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Abstract
The utility model discloses a kind of three arm rectification adversers concatenation load type UPS circuits, it includes charger, battery, DC DC converters, the synchro switch concatenated with civil power（SW）, rectification adverser, line voltage detector, controller, the rectification adverser include rectifier arm, common arm, inversion arm；When civil power is normal, rectification adverser acts, and mains current forms loop by synchro switch, load, inversion arm, common arm to ground；In commercial power interruption, rectifier arm inversion arm acts, and battery current returns DC DC converters by DC DC converters, inversion arm, rectifier arm and forms loop again；The utility model carries circuit because inversion arm only handles fraction load voltage, rectifier arm also flows only through the idle and harmonic current of load, possess higher efficiency under most condition of work, and can compensate load current distortion and idle composition to improve the power factor of input.
Description
Technical field
UPS circuits are the utility model is related to, more particularly to a kind of UPS that there are three arm rectification adversers to be concatenated with load electric
Road.
Background technology
Online UPS (on-line UPS) circuit framework of tradition is as shown in figure 1, include a rectifier
(Rectifier)-inverter (Inverter), a charger (Charger) and dc-dc (DC/DC) conversion
Device.In the case where civil power is normal, load electric provides via civil power-rectifier-direct-current chain-inverter path, is born in commercial power interruption
Electric power is carried then to be provided by the path of battery-DC-DC converter-direct-current chain-inverter.This stage type electrical power conversion
The advantages of circuit, shortcoming was that whole efficiency is equal to rectification can to make input work simultaneously because of control (PFC) and adjustment load voltage
The product of device efficiency and inverter efficiency, so whole efficiency is relatively low.
Utility model content
The utility model is the above mentioned problem of prior art to be solved, and proposes work(that is a kind of efficient and can improving input
The three arm rectification adversers concatenation load type UPS circuits of the rate factor.
In order to solve the above technical problems, the utility model proposes technical scheme be a kind of three arm rectification adverser strings of design
Connect load type UPS circuits, including concatenated with civil power charger, battery, dc-dc；Also include being sequentially connected being followed by
Line voltage detector, the reception line voltage whether synchro switch, rectification adverser, detection civil power on civil power interrupt are detected
The controller of device measured signal, the rectification adverser includes rectifier arm in parallel, common arm, inversion arm, wherein the rectification
Arm includes the power switch of two series connection, and the tie point C of two power switch is of coupled connections the synchro switch and load；It is described common
Include the power switch of two series connection, the ground of the tie point A connection civil powers of two power switch with arm；The inversion arm includes two
The power switch of series connection, the tie point B of two power switch are of coupled connections the other end of the load；The dc-dc
Two output ends connect the rectifier arm, common arm, the both ends of inversion arm of parallel connection respectively；The controller controls when civil power is normal
Rectification adverser acts, and mains current forms loop by synchro switch, load, inversion arm, common arm to ground；The controller
The action of rectifier arm inversion arm is controlled in commercial power interruption, battery current returns DC- again by dc-dc, inversion arm, rectifier arm
DC converters form loop.
The rectifier arm in parallel, common arm, inversion arm both ends between connect filter capacitor.
The load both ends difference tandem reactor.
The controller uses SPWM controllers, and is controlled with SPWM signals in the rectifier arm, common arm, inversion arm
Power switch.
The dc-dc uses the current source push-pull type converter with buck characteristic.
Compared with prior art, the utility model carries circuit because inversion arm only handles fraction load voltage, rectification
Arm also flows only through the idle and harmonic current of load, possesses higher efficiency under most of condition of work, and can be with
Compensate load current distortion and idle composition to improve the power factor of input.
Brief description of the drawings
Fig. 1 is traditional twin-stage on line type UPS circuit framework；
Fig. 2 is the functional-block diagram of online concatenation voltage adjustment；
Fig. 3 is half bridge rectifier-inverter framework；
Fig. 4 is rectifier-inverter framework that rectifier uses no bridge type framework；
Fig. 5 is three arm concatenation type rectification adverser circuit frameworks；
Fig. 6 is the UPS circuit frameworks using three arm concatenation type rectification adversers；
Fig. 7 is UPS control signal framework；
Fig. 8 is rectifying part phasor diagram；
Fig. 9 is Converting Unit (decompression mode) phasor diagram；
Figure 10 is Converting Unit (boost mode) phasor diagram；
Figure 11 intermediate arms use the concatenation type framework rectifying part control block diagram of PWM switchings；
Figure 12 intermediate arms use the concatenation type framework Converting Unit control block diagram of PWM switchings；
Figure 13 is artificial circuit figure；
Figure 14 is the response wave shape for being changed to 1kW by 500W in resistive load；
Figure 15 is to load the response wave shape under (80+330 F) in R-C-D.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, is described in further detail to the utility model.It should be appreciated that specific embodiment described herein is used only for explaining this
Utility model, it is not used to limit the utility model.
The utility model discloses a kind of three arm rectification adversers concatenation load type UPS circuits, and it includes concatenating with civil power
Charger, battery, dc-dc；Also include being sequentially connected the synchro switch being followed by civil power, rectification adverser, inspection
Survey the control of line voltage detector (not drawn in Fig. 2), reception line voltage detector measured signal that whether civil power interrupts
Device (is not drawn) in Fig. 2.To illustrate its operation principle, the functional-block diagram shown in Fig. 2 refer to.This programme uses on-line tuning
The mode of power factor and load voltage, its inverter uses the framework for concatenation type with line voltage, in the case where civil power is normal, bears
Carry electric power directly to be provided by civil power concatenation inverter, inverter is now negative to adjust with the change of compensation line voltage and distorted manner
Carry voltage.Inverter absorbs active under decompression mode (line voltage is higher than output voltage), and this is active by with civil power and connecing
Rectifier be recycled to civil power input side recycling；The inverter on the contrary under boost mode (line voltage is less than output voltage) is then
It need to provide active, this is active to be absorbed by rectifier by civil power input.Rectifier can also treat as active electric filtering simultaneously
Device is compensating the distortion of load current and idle composition to improve the power factor of input.Such a mode, although rectification-inversion
Device is still twin-stage, but because rectifier and inverter only handle the sub-fraction of bearing power, loss is smaller, whole efficiency compared with
It is high.When commercial power interruption, synchro switch SW ends, and two exit point B and C of rectifier and inverter can then form inverter use
To provide load voltage, and unbroken electric power is provided through DC-DC converter by battery.
In the preferred embodiment, the rectifier in Fig. 2 and inverter are to be integrated into rectification adverser, whole for UPS circuits
Flowing inverter circuit, most often adopted circuit framework is semibridge system stream device-inverter framework as shown in Figure 3, for
For 230Vac system, its DC-link voltage need to be raised to 800V, may also be made for the asymmetrical load of positive-negative half-cycle electric current
Into the imbalance of two derided capacitors voltages.Another framework be as shown in figure 4, rectifier using no bridge type framework rectifier-
Inverter framework, its voltage multiplying rectifier mode step-up ratio are only Fig. 3 half, and the diode of A arms can be faster two pole in addition
Pipe, reach the more purpose of high speed switching and low conduction voltage drop.Fig. 3 and Fig. 4 frameworks are also semibridge system framework in inverter section,
Therefore higher conducting electric current and capacitor voltage balance problem are still suffered from.To solve this problem while improving above-mentioned civil power to load
The efficiency of power supply and reduce converter cost, the utility model proposes preferred embodiment it is as shown in Figure 5：The commutation inversion
Device includes rectifier arm in parallel, common arm, inversion arm, wherein the rectifier arm includes the power switch of two series connection, two power
The tie point C of switch is of coupled connections the synchro switch and load；The common arm includes the power switch of two series connection, two work(
The ground of the tie point A connection civil powers of rate switch；The inversion arm includes the power switch of two series connection, the connection of two power switch
Point B is of coupled connections the other end of the load；Two output ends of the dc-dc connect respectively parallel connection rectifier arm,
Common arm, the both ends of inversion arm.The rectification adverser is three arm type concatenation type framework, is maintained using rectifier arm (REC-arm)
DC voltage (Vd), while make it that the input current of civil power is low as the idle and harmonic current of active filters compensation load
Distortion and for unit work(because.Utilize inversion arm (INV-arm) output voltage (Vo) and load voltage (VL) series connection, make the two
Series voltage is equal to line voltage (Vs), therefore inverter only handles the difference of line voltage and load voltage.
Vs=Vo+VL (1)
Secondly because three arm electric currents sum total be zero, therefore intermediate arm (COM-arm) flow through rectifier arm (REC-arm) with it is inverse
Become the difference of arm (INV-arm) electric current, intermediate arm electric current is equal to the watt current of load because under in specific work.
Fig. 6 shows the UPS circuit frameworks using three arm concatenation type rectification adversers, line voltage detector (grid
Voltage detection) whether detecting line voltage normal, if civil power to operate in line model (on-line if normal
Mode), load electric is provided by civil power, and the rectification adverser action of the controller control three arm type, mains current is by same
Switch, load, inversion arm, common arm to ground formation loop are walked, is responsible for adjusting the power factor and tune of civil power input by rectifier arm
Whole 400V DC-link voltages, load voltage are then responsible for adjustment by inversion arm.Discharge mode is operated in if civil power is failure
(discharge mode), load electric is provided by battery, is responsible for controlling battery discharge by converter and is risen to cell voltage
400V, controller only control the rectifier arm in three arm type rectification adverser to be acted with inversion arm, are responsible for adjustment load voltage, middle
Arm then stops switching, and battery current returns DC-DC converters by dc-dc, inversion arm, rectifier arm and forms loop again.By
This, no matter whether normal civil power is, ensures and carries out uninterrupted power supply to load.
Referring to the preferred embodiment shown in Fig. 6, the rectifier arm in parallel, common arm, inversion arm both ends between connect
Filter capacitor.The load both ends difference tandem reactor.The dc-dc uses the current source with buck characteristic
Push-pull type converter.Dc-dc uses the current source push-pull type converter (current-fed with buck characteristic
Push-pull converter), make system that there is broader input battery voltage range, to increase discharge time and reduction
The AH capacity of battery, DC-DC converter can also use the concatenation type three arm type rectifier of other circuits and this creation-inverse
Become device to coordinate.
Fig. 7 shows UPS control signal Organization Chart, and the controller uses SPWM controllers, and with SPWM signals
Control the power switch in the rectifier arm, common arm, inversion arm.Bypass switch be present between line voltage and load
(bypass SW), to be able to directly by civil power supply load electricity consumption in maintenance.
It can be pushed away by Fig. 6 three arm type rectifier-inverter circuit：
Three arms are switched using sinusoid PWM, and the output voltage of three arms is represented by respectively：
Again (4) are substituted into (2), (3) can obtain：
(5), (6) show that the output of rectifier arm and inversion arm is influenceed by common arm, if making the switching of the two not produce
Raw reciprocation, (5) and (6) must decouple.Consider that concatenation type framework Vo can be with the same phases of Vs (decompression mode) or anti-phase (boosting mould
Formula), this creation proposes being set as intermediate arm control voltage：
(7) substitution (5) and (6) can be obtained：
Fig. 7 phasor diagram can be obtained according to (8) and (9), can simultaneously be depressured and boost mode operates, this can be by Fig. 8
And Fig. 9 phasor diagram observation is learnt, due to kpwmvconCAnd kpwmvconBAmplitude respectively can be more than VL/2-VsAnd 3VL/2-VsShake
Width, therefore the PWM switchings of rectifier arm and inversion arm also can be in linear zone, and DC voltage (Vd) by Figure 10 boost mode
Determine, following condition must be met：
Vd＞ 3VL(peak,max)-2Vs(peak,min) (10)
Because general VL size is set close to Vs, (10) point out the DC voltage (V of this creationd) about only need to be more than one times
Line voltage can (that is, 230Vac systems, 400V).
Fig. 7 intermediate arms use the concatenation type circuit phasor diagram of PWM switchings：Fig. 8 rectifying parts；(the decompression of Fig. 9 Converting Units
Pattern)；Figure 10 Converting Units (boost mode).
The design of controller can be carried out according to above-mentioned derived circuit model (8) and (9), be divided shown in Figure 11 and Figure 12
Not Wei rectifier arm and inversion arm control loop block diagram, wherein power circuit part is according to circuit model (8) and (9) institute
Paint, ksAnd kvThe respectively sensing ratio of electric current and voltage.The control of rectifier arm includes voltage and current control loop, electric current control
Loop processed controls with feedback to (feedforward) before using and is used in combination, forward direction control signal vfiUtilize the normal value of input voltage
(vmSin t) and load voltage orderDirectly eliminate VsAnd VLDisturbance, such electric current feedback controller k1It is used only
One ratio (P) controls.But to compensate the var of load and harmonic current to perform the work(of active power wave filter
Can, the electric current of feedback herein is input current rather than the electric current of rectifier arm.The advantages of such a way is using only a current sense
Device.If ignoring the disturbance of load current, input current follow the trail of its order response by Fig. 8 can deduce for：
Input current orderIt is the DC voltage controller G as produced by DC voltage loopvUtilize direct current voltage error
Produce the amplitude of input current orderIts is inverted to obtain the current order of rectifier multiplied by with synchronizing signal (sin t)Because DC voltage will inevitably include secondary ripple (2fo), GvThe design of controller is to make voltage circuit bandwidth
Mains current is made as low distortion using secondary ripple component of decaying far below secondary frequency.
For the control of inversion arm, can be pushed away by Fig. 6 output capacitance voltage：
Figure 12 show inversion arm control loop block diagram, and it adopts double loop control, and external loop is voltage circuit, inner looping
It is then capacitance current loop.It is the differential of voltage yet with capacitance current, therefore capacitance current can be estimated using voltage, such as
This can be to save a current sensor.Dotted line part shown in Figure 12 is virtual capacitance current feedback (icap), it is only used for
Analyze, be to utilize estimation in implementationSubstitution.Consider differential also by noise jamming, the form such as square of this creation differentiator
A low pass filter 1/ (1+ s) is it is possible to additionally incorporate listed by figure, to an approximate differentiator in low frequency, in high frequency then by gain
Decay.Current control loop preferably still adds a forward direction control signal vfI, to eliminate VLAnd VsDisturbance.Utilize virtual electricity
Stream sensing loop can estimate that the response of current loop is generally：
uIIt can be considered the bandwidth of current loop.The order of capacitance current can be by voltage commandsVia 90 ° of phase-shift circuit
Produce, but be that the error for overcoming current loop must add the error that voltage is ordered with it.
To verify the feasibility of aforementioned circuit, the 1KVA/230V/50Hz systems of this creation actual design one are simultaneously subject to emulation
Checking, circuit parameter are as follows：
vtm=5V/20KHz, Vs=230Vrms ± 10%, ks=0.1, kv=0.01,
Cd=1000 F, L=1mH, Co=10 F
Shown in artificial circuit Figure 13, it is as shown in figure 14 to be changed to by 500W 1kW response wave shape in resistive load, by defeated
Enter electric current (Is) closely follow the trail of its order (Isc) response also can verify that the validity of current controller.DC voltage also can quilt
400V accurately is maintained, and possesses good dynamic response, the validity in checking DC voltage control loop, output voltage (VL)
It can closely follow it and order (VLC), reach the effect of low output impedance.Loaded in rectification R-C-D under (80+330 F)
Response is then as shown in Figure 15, although load current distortion is serious, input current after the compensation of rectifier arm electric current by quite connecing
It is near sinusoidal and possess the function of active filters with the same phase of input voltage, checking rectifier arm.Analog result above is except checking institute
Outside the validity for proposing control method, also indirect verification carries the method for switching of intermediate arm and derives the accuracy of model, and demonstrate,proves
It is bright to carry three arm concatenation type rectifiers-inverter applied to UPS to be truly feasible.
Above example is by way of example only, non-to provide constraints.It is any without departing from the application spirit and scope, and to it
The equivalent modifications of progress or change, it is intended to be limited solely by among claims hereof scope.
Claims (5)
1. a kind of three arm rectification adversers concatenation load type UPS circuits, including the charger, battery, the DC-DC that are concatenated with civil power turn
Parallel operation, it is characterised in that：Also include being sequentially connected the synchro switch being followed by civil power（SW）, rectification adverser, detection civil power
Line voltage detector, the controller of reception line voltage detector measured signal whether interrupted, the rectification adverser bag
The rectifier arm, common arm, inversion arm of parallel connection are included, wherein
The rectifier arm includes the power switch of two series connection, the tie point of two power switch（C）It is of coupled connections and described synchronously opens
Close and load；
The common arm includes the power switch of two series connection, the tie point of two power switch（A）Connect the ground of civil power；
The inversion arm includes the power switch of two series connection, the tie point of two power switch（B）Be of coupled connections the load
The other end；
Two output ends of the dc-dc connect the rectifier arm, common arm, the both ends of inversion arm of parallel connection respectively；
The controller controls rectification adverser to act when civil power is normal, and mains current is by synchro switch, load, inversion
Arm, common arm form loop to ground；
The controller controls rectifier arm inversion arm to act in commercial power interruption, and battery current is by dc-dc, inversion
Arm, rectifier arm return dc-dc and form loop again.
2. three arms rectification adverser as claimed in claim 1 concatenates load type UPS circuits, it is characterised in that：It is described in parallel
Rectifier arm, common arm, inversion arm both ends between connect filter capacitor（Cd）.
3. three arms rectification adverser as claimed in claim 2 concatenates load type UPS circuits, it is characterised in that：The load two
End difference tandem reactor（L）.
4. three arms rectification adverser as claimed in claim 3 concatenates load type UPS circuits, it is characterised in that：The controller
The power switch in the rectifier arm, common arm, inversion arm is controlled using SPWM controllers, and with SPWM signals.
5. three arms rectification adverser as claimed in claim 4 concatenates load type UPS circuits, it is characterised in that：The DC-DC turns
Parallel operation uses the current source push-pull type converter with buck characteristic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720334814.8U CN206820538U (en) | 2017-03-31 | 2017-03-31 | Three arm rectification adversers concatenate load type UPS circuits |
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|---|---|---|---|
| CN201720334814.8U CN206820538U (en) | 2017-03-31 | 2017-03-31 | Three arm rectification adversers concatenate load type UPS circuits |
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| CN206820538U true CN206820538U (en) | 2017-12-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115776241A (en) * | 2022-06-23 | 2023-03-10 | 中国科学院电工研究所 | AC-AC converter based on switch unit and control method |
-
2017
- 2017-03-31 CN CN201720334814.8U patent/CN206820538U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115776241A (en) * | 2022-06-23 | 2023-03-10 | 中国科学院电工研究所 | AC-AC converter based on switch unit and control method |
| CN115776241B (en) * | 2022-06-23 | 2023-07-21 | 中国科学院电工研究所 | AC-AC converter based on switch unit and control method |
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