CN201754560U - Circuit capable of realizing PFC constant-flow parallel connection - Google Patents
Circuit capable of realizing PFC constant-flow parallel connection Download PDFInfo
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- CN201754560U CN201754560U CN2009202728395U CN200920272839U CN201754560U CN 201754560 U CN201754560 U CN 201754560U CN 2009202728395 U CN2009202728395 U CN 2009202728395U CN 200920272839 U CN200920272839 U CN 200920272839U CN 201754560 U CN201754560 U CN 201754560U
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Abstract
A circuit capable of realizing PFC constant-flow parallel connection comprises at least two PFC circuits which are in parallel connection, a sampling circuit, a main controller circuit and a constant-flow control circuit. The sampling circuit comprises an inputted mains supply voltage sampling circuit, an outputted direct-current voltage sampling circuit and inductive current sampling circuits of different PFCs. The main controller circuit is used for rectifying power factors. The constant-current control circuit comprises a plurality of current error control circuits, each PFC circuit corresponds to one current error control circuit, and each error control circuit comprises an operating link, a control link and a duty ratio regulating link. The circuit capable of realizing PFC constant-flow parallel connection has the advantages of simple control circuits, easy implement, lower cost and fast response.
Description
Technical field
The utility model relates to a kind of PFC of realization (Power Factor Correction, power factor correction) circuit of current-sharing parallel connection, this circuit can be realized the current-sharing parallel connection of polylith PFC plate, especially can realize the parallel connection of the PFC power amplifier board of different capacity grade.
Background technology
In power electronic equipments such as uninterrupted power supply (ups) Unity, be provided with the power amplifier board that carries out energy conversion, in order to solve power capacity restricted problem, often adopt the scheme of polylith power amplifier board parallel connection, the scheme of polylith power amplifier board parallel connection also has superiority on cost.
Power amplifier board is parallel with plurality of advantages, but owing to components and parts itself there are differences, as the pressure drop of thyristor (SCR), the difference of inductance, the switching speed of switching tube etc., often make that the impedance of each system is inconsistent, directly with two power amplifier board parallel connections, will not cause the electric current of every power amplifier board also inconsistent if do not adopt the current-sharing measure, gently then influence the components and parts life-span, the waste capacity, heavy then burn power amplifier board, cause whole ups system collapse.Therefore when power amplifier board use in parallel, the current-sharing measure is essential.
For the parallel current-sharing of power amplifier board, be divided into initiatively current-sharing and passive current-sharing on the whole.Passive current-sharing method commonly used is to connect differential mode inductance (Differential Mode Choke) between power amplifier board, reaches the purpose of current-sharing by regulating impedance, as shown in Figure 1.Such method current-sharing effect is very limited, and cost is higher, less use for present technological means.
In power amplifier board initiatively sharing control in parallel, at pfc circuit a large amount of documents and patent output are arranged partly, we look back down some common scheme.As shown in Figure 2, this control mode is (Current sharing method and apparatus for alternatelycontrolling parallel connected boost PFC circuits) in U.S. Patent application US20050036337A1, mentioned and used 2 control chip UC3854 (1,2), under the situation of common voltage control loop, produce 2 independently current controlled circuits, control 2 power amplifier boards in parallel with this.This method is the given identical of two electric current loops, can not realize current-sharing truly.This scheme is only at 2 power amplifier board parallel connections in addition, and is narrower.
As shown in Figure 3, this also is the way of more employing on the market, and the signal of required sampling and the scheme of Fig. 2 are roughly the same, and current sample generally is the inductive current of every power amplifier board of sampling.The output signal Vm of controller directly and triangular wave relatively produce pwm signal; And the inductive current of subplate adds up through result and the Vm that adjuster obtains mutually with the difference of the inductive current of mainboard, has relatively obtained the pwm signal of secondary power amplifier board then with triangular wave.
The difference of this scheme and Fig. 2 is, in the control loop of power amplifier board B, introduced the signal of the difference between currents of itself and power amplifier board A, and the electric current of power amplifier board B is drawn close to power amplifier board A, is issued to the effect of current-sharing at last in the certain situation of gross power.Controller produce homophony system wave voltage Vm and the voltage compensation quantity signal that obtains by adjusting to major-minor PFC plate inductive current difference after, remove to regulate the PWM of secondary power amplifier board, the electric current of secondary PFC plate is drawn close to the electric current of main power amplifier board, when main power amplifier board electric current and secondary power amplifier board have than big-difference, need the time of adjusting longer, especially can influence dynamic property.
All there is certain shortcoming in above prior art, shows as: 1, all mobility is low; 2, cost is higher; 3, mainboard is not done adjusting, respond slower; 4 and plate quantity only limit to two; 5, can't realize the PFC plate parallel connection of different capacity grade.
The utility model content
In order to overcome the defective on the prior art, the utility model proposes a series of new PFC plate parallel current-sharing circuit to solve above deficiency.
The utility model proposes a kind of circuit of the PFC of realization current-sharing parallel connection, it comprises:
The pfc circuit of at least two parallel connections, sample circuit, main controller circuit and equalizing control circuit.Wherein, each pfc circuit is used to realize rectification, the function that input power factor is proofreaied and correct and boosted.Sample circuit comprises the inductive current sample circuit of input line voltage sample circuit, output dc voltage sample circuit and each PFC.Main controller circuit is used to realize the main controller circuit of power factor correction, and it is preferably DSP (digital signal processor).Equalizing control circuit comprises a plurality of current error control loops, all corresponding current error control loop of each pfc circuit.Each ERROR CONTROL loop comprises operation link, controlling unit and duty cycle adjustment link.
According to a kind of preferred implementation of the present utility model, wherein: the input of each pfc circuit is in parallel, and output also is in parallel.
According to a kind of preferred implementation of the present utility model, wherein: main controller circuit is a digital signal processor.
According to a kind of preferred implementation of the present utility model, wherein: described each pfc circuit in parallel is the equal-wattage grade, and also identical with corresponding described each the current error control loop of described each pfc circuit.
According to a kind of preferred implementation of the present utility model, wherein: the pfc circuit power grade difference of described parallel connection, and further comprise a control unit between described sampling element in the current error control loop of each secondary pfc circuit and the described difference operation link.
The utility model is introduced the current error control loop, the pwm signal of PFC plate (comprising mainboard) in parallel, all can be made the input current of each pfc circuit follow average current in each switch periods, realize current-sharing truly by the ERROR CONTROL loop adjustment.
Compared with prior art, it is simple that PFC current sharing control circuit of the present utility model has a control circuit, is easy to realize, cost is lower, the advantage that response speed is fast, and can realize the polylith power amplifier board parallel connection of different capacity grade, compare with existing technology, have remarkable advantages.
Description of drawings
Fig. 1 is the passive current-sharing parallel connection of power amplifier board in the prior art, uses the schematic diagram of differential mode inductance scheme;
Fig. 2 is the schematic diagram that has the control mode of separate current ring in the prior art;
Fig. 3 is in the prior art and the schematic diagram of plate system shared control unit;
Fig. 4 is
The utility modelEmbodiment one, and the schematic diagram of controlling object is made in the pfc circuit parallel connection of equal-wattage with average current;
Fig. 5 is
The utility modelEmbodiment two, and the schematic diagram of controlling object is made in the pfc circuit parallel connection of equal-wattage with the mainboard electric current;
Fig. 6 is
The utility modelEmbodiment three, and the schematic diagram of controlling object is made in the power amplifier board parallel connection of different capacity with average current;
Fig. 7 is
The utility modelEmbodiment four, the pfc circuit parallel connection of different capacity, and the sampling of major-minor plate inductive current is set to different sampling ratios, makees the schematic diagram of controlling object with the mainboard electric current.
Embodiment
Below in conjunction with accompanying drawing hardware circuit of the present utility model and control method are described further.
Embodiment one
Analyze hardware circuit of the present utility model and control method below in conjunction with the pfc circuit of double-boost framework.Because this framework has symmetry in the positive-negative half-cycle of civil power, so be the example explanation only with the circuit on positive limit.As shown in Figure 4, thyristor SCR1, inductance L 1, switching tube Q1, sustained diode 1 and capacitor C are formed the positive limit of the pfc circuit of a double-boost framework; Thyristor SCR2, inductance L 2, switching tube Q2, sustained diode 2 and capacitor C are formed the positive limit of the pfc circuit of another double-boost framework, and their input is in parallel, and output also is in parallel.The sample circuit input line voltage of sampling respectively, the electric current of the voltage of output capacitance C and inductance L 1 and L2.Control section selects DSP (digital signal processor) to realize that hardware circuit is relatively simplified like this.
Following control and analysis, the control of the first current-sharing unit, at first to inductance L 1 and inductance L 2 sample rate current iL1, iL2 does average calculating operation (corresponding to 401 dotted portions among the figure), obtain signal and be (iL1+iL2)/2, as the given signal of the reference of ERROR CONTROL loop.The given signal of this electric current subtracts each other with the current sampling signal of inductance L 1 and L2 respectively, obtains the two-way current error signal, passes through current error controller Gi1 and Gi2 then respectively, obtains two modulating wave compensation rate signal V1 and V2.The pfc circuit parameter of two parallel connections in the present embodiment is identical, and power equates that so error loop is also identical, Gi1 is identical with Gi2, the first-selected proportional controller of present embodiment.
The power factor correction unit control method is: Vref is that reference whole and the plate system is given, represent the desired value of output voltage, Vout is an output voltage feedback signal, Vref and Vout subtract each other, the voltage error signal that obtains, by Voltage loop controller Gv, it is given that multiply each other with the input sample signal (M link among the figure) obtains electric current loop again then; The given feedback signal with electric current loop of electric current loop, i.e. the mean values (iL1+iL2)/2 of two pfc circuit inductive current samplings, the current error signal that the difference of the two obtains, current error signal obtain main modulating wave Vm by current loop controller Gi again;
The duty cycle adjustment unit realize modulating wave compensation rate signal V1 and V2 respectively with main modulating wave Vm addition, obtain Vm1 and Vm2, Vm1 and Vm2 relatively obtain the pwm signal of two pfc circuits respectively with triangular wave.
Embodiment two
As shown in Figure 5, be a plurality of pfc circuit parallel connections, the power section hardware circuit is with embodiment one, and input is in parallel, and output also is in parallel.Omitted hardware circuit part among the figure.The master controller Voltage loop is 501, with the utility model embodiment one; Electric current loop is 502, and its current feedback is main PFC inductive current, but not average current; Current error control loop quantity is corresponding one by one with pfc circuit in parallel, and diagram 503 is current error control loops corresponding with the PFC-A circuit, and its electric current is given as ∑ Is/X, and wherein X is the quantity of parallel PFC plate.Gi1, Gi2, Gi3 are respectively the PFC-A circuit, and the controller of the current error ring of PFC-B circuit and PFC-C circuit is corresponding among the figure 504.Each ERROR CONTROL loop is identical with the utility model embodiment one.Because the effect of current error loop makes each PFC plate inductive current follow average current, even do controlling object with the inductive current of main PFC, also can realize current-sharing between each power amplifier board.
Embodiment three
As shown in Figure 6, be embodiment three of the present utility model, pfc circuit in parallel is the different capacity grade.Rectifier bridge Bridge, inductance L 1, switching tube Q1, diode D1 and capacitor C are formed pfc circuit one; Rectifier bridge Bridge, inductance L 2, switching tube Q2, diode D2 and capacitor C are formed pfc circuit two.Two pfc circuit hardware parameter differences, power are also different, and circuit one rated power is P1, and rated current is I1; Circuit two rated power are P2, and rated current is I2.If circuit one is a mainboard, circuit two is a subplate.Behind current sample, obtain major-minor PFC electric current inductive current sampled signal iL1 and iL2, circuit two is handled current sampling signal through a proportional component after to inductance L 2 current samples.This proportional component gain K=P1/P2.Obtain average current feedback signal (iL1+KiL2)/2 through computing then, as master controller electric current loop feedback signal and the given signal of error loop, all the other links are with embodiment one of the present utility model.When a plurality of pfc circuits were in parallel, average current feedback signal ∑ Is/X implication is: [iL1+ (P1/P2) * iL2+ (P1/P3) * iL3+......+ (P1/PX) * iLX]/X, wherein X was a power amplifier board quantity in parallel, and other power amplifier board is converted to main pfc circuit.
Embodiment four
As shown in Figure 7, for embodiment four, its power section hardware circuit is with embodiment three of the present utility model, pfc circuit in parallel is the different capacity grade, is respectively Pa and Pb, rated current is Ia and Ib.S1 and S2 are respectively the inductive current sample circuits of pfc circuit one and pfc circuit two among the figure, and it is sampled than (actual inductive current is than the ratio of sampling end electric current) difference, is respectively K1 and K2, satisfies Pa/K1=Pb/K2.Through 701 average calculating operation links among the figure, obtain current signal and be (iL1/K1+iL2/K2)/2, this signal is as the given signal of error loop electric current.And the master controller current feedback signal is the inductive current of main pfc circuit.
As mentioned above, in the utility model, each pfc circuit in parallel can be the equal-wattage grade, also can be the different capacity grade.For the pfc circuit parallel connection of equal-wattage grade, the current error control loop corresponding with pfc circuit is also identical.When the pfc circuit power grade of parallel connection not simultaneously, need to increase a control unit between sampling element in the current error control loop of each secondary pfc circuit and the difference operation link, be generally proportional controller, gaining is K.For example mainboard A power is Pa, and electric current is Ia, and subplate B power is Pb, and electric current is Ib, and then the gain K of proportional controller equals Pa/Pb.Other way is, the inductive current sample circuit of each secondary PFC is provided with different sampling ratios.For example, mainboard I power is PI, and inductive current sampling attenuation ratio is σ i, and subplate II power is PII, and inductive current sampling attenuation ratio is σ ii, then should satisfy σ i/ σ ii=PI/PII.By above these two kinds of transform methods, can the inductive current of the pfc circuit of different capacity grade be compared, do the difference computing and the computing etc. of averaging, realize the pfc circuit parallel connection of different capacity grade, and the ratio of their electric current equals the ratio of its power.
Described sharing control partial circuit can be realized with the shared DSP of master controller that realizes power factor correction, also can be the hardware circuit that is independent of master controller.Preferably the former, circuit is simple like this, realizes easily.
The circuit of the PFC of realization current-sharing parallel connection of the present utility model is compared with traditional PFC and plate technique, has the following advantages:
This circuit can be realized the parallel connection of polylith power amplifier board;
This circuit can be realized the PFC plate parallel connection that power grade is different;
This circuit can be realized polylith plate shared control unit, and control is simple, is easy to realize;
This circuit is compared with technology in the past, and the response speed of whole power amplifier board parallel system is fast, and regulating power is strong;
This circuit design is comparatively flexible, can adopt the mainboard electric current as the electric current loop feedback input of master controller, also can adopt the average current of all power amplifier boards.
Above with reference to description of drawings various preferred embodiments of the present utility model; but only otherwise deviate from essence of the present utility model and scope; those skilled in the art can carry out modifications and changes on the various forms to it, all belongs to protection range of the present utility model.
Claims (5)
1. the circuit that can realize PFC current-sharing parallel connection is characterized in that comprising with the lower part:
The pfc circuit of at least two parallel connections;
Sample circuit, it comprises the inductive current sample circuit of input line voltage sample circuit, output dc voltage sample circuit and each PFC;
Be used to realize the main controller circuit of power factor correction;
Equalizing control circuit, it comprises a plurality of current error control circuits, all corresponding described current error control circuit of described each pfc circuit, each described ERROR CONTROL circuit comprises operation link, controlling unit and duty cycle adjustment link.
2. the circuit of realizing pfc circuit current-sharing parallel connection as claimed in claim 1 is characterized in that: the input of described each pfc circuit is in parallel, and output also is in parallel
3. the circuit of realizing pfc circuit current-sharing parallel connection as claimed in claim 1 is characterized in that: described main controller circuit is a digital signal processor.
4. the circuit of realizing pfc circuit current-sharing parallel connection as claimed in claim 2 is characterized in that: described each pfc circuit in parallel is the equal-wattage grade, and also identical with corresponding described each the current error control loop of described each pfc circuit.
5. the circuit of realizing pfc circuit current-sharing parallel connection as claimed in claim 2, it is characterized in that: the pfc circuit power grade difference of described parallel connection, and further comprise a control unit between described sampling element in the current error control loop of each pfc circuit and the described difference operation link.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009202728395U CN201754560U (en) | 2009-11-17 | 2009-11-17 | Circuit capable of realizing PFC constant-flow parallel connection |
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| CN2009202728395U CN201754560U (en) | 2009-11-17 | 2009-11-17 | Circuit capable of realizing PFC constant-flow parallel connection |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102594157A (en) * | 2012-04-05 | 2012-07-18 | 重庆安谐新能源技术有限公司 | Signal acquisition device and processing method for alternating current power current-sharing output system |
| CN102611300A (en) * | 2012-04-05 | 2012-07-25 | 重庆安谐新能源技术有限公司 | Current-sharing control device of direct-current and current-sharing input system |
| CN102621373A (en) * | 2012-04-05 | 2012-08-01 | 重庆安谐新能源技术有限公司 | Signal collection device and signal processing method of current-sharing input system of alternating-current power supply |
| CN102682980A (en) * | 2012-03-06 | 2012-09-19 | 特变电工新疆新能源股份有限公司 | Integrated inductor, parallel current-equalizing circuit and inverter with parallel current-equalizing circuit |
| CN103715863A (en) * | 2012-09-29 | 2014-04-09 | 艾默生网络能源有限公司 | Converter and heat equalization control method of power device of converter |
| CN106208344A (en) * | 2015-04-30 | 2016-12-07 | 艾默生网络能源有限公司 | A kind of uninterrupted power source |
| US9960699B2 (en) | 2016-09-29 | 2018-05-01 | Delta Electronics, Inc. | Power supply system with plural parallel modules and loop current limiting |
| CN108270355A (en) * | 2016-12-30 | 2018-07-10 | 比亚迪股份有限公司 | The control method and device of switching mode DCDC parallel circuits |
| CN112737351A (en) * | 2020-12-29 | 2021-04-30 | 合肥同智机电控制技术有限公司 | Rapid current-sharing DC-DC control method |
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2009
- 2009-11-17 CN CN2009202728395U patent/CN201754560U/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102682980A (en) * | 2012-03-06 | 2012-09-19 | 特变电工新疆新能源股份有限公司 | Integrated inductor, parallel current-equalizing circuit and inverter with parallel current-equalizing circuit |
| CN102594157A (en) * | 2012-04-05 | 2012-07-18 | 重庆安谐新能源技术有限公司 | Signal acquisition device and processing method for alternating current power current-sharing output system |
| CN102611300A (en) * | 2012-04-05 | 2012-07-25 | 重庆安谐新能源技术有限公司 | Current-sharing control device of direct-current and current-sharing input system |
| CN102621373A (en) * | 2012-04-05 | 2012-08-01 | 重庆安谐新能源技术有限公司 | Signal collection device and signal processing method of current-sharing input system of alternating-current power supply |
| CN102621373B (en) * | 2012-04-05 | 2015-04-22 | 重庆安谐新能源技术有限公司 | Signal collection device and signal processing method of current-sharing input system of alternating-current power supply |
| CN103715863A (en) * | 2012-09-29 | 2014-04-09 | 艾默生网络能源有限公司 | Converter and heat equalization control method of power device of converter |
| CN103715863B (en) * | 2012-09-29 | 2016-12-21 | 艾默生网络能源有限公司 | A kind of changer and the heat equalization control method of power device thereof |
| CN106208344A (en) * | 2015-04-30 | 2016-12-07 | 艾默生网络能源有限公司 | A kind of uninterrupted power source |
| US9960699B2 (en) | 2016-09-29 | 2018-05-01 | Delta Electronics, Inc. | Power supply system with plural parallel modules and loop current limiting |
| CN108270355A (en) * | 2016-12-30 | 2018-07-10 | 比亚迪股份有限公司 | The control method and device of switching mode DCDC parallel circuits |
| CN108270355B (en) * | 2016-12-30 | 2019-11-22 | 比亚迪股份有限公司 | The control method and device of switching mode DCDC parallel circuit |
| CN112737351A (en) * | 2020-12-29 | 2021-04-30 | 合肥同智机电控制技术有限公司 | Rapid current-sharing DC-DC control method |
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