CN102497098A - Multiphase synchronous rectification BUCK topology circuit - Google Patents
Multiphase synchronous rectification BUCK topology circuit Download PDFInfo
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- CN102497098A CN102497098A CN2011104303885A CN201110430388A CN102497098A CN 102497098 A CN102497098 A CN 102497098A CN 2011104303885 A CN2011104303885 A CN 2011104303885A CN 201110430388 A CN201110430388 A CN 201110430388A CN 102497098 A CN102497098 A CN 102497098A
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Abstract
The invention discloses a multiphase synchronous rectification BUCK topology circuit which comprises a main control unit and an output filtering capacitor, and each phase circuit comprises a capacitor energy storage unit, a charging power unit, a synchronous rectification unit, a drive circuit, a fly-wheel diode and an inductive energy storage unit; the main control unit is respectively connected with the drive circuit of each phase circuit, and the drive circuit of each phase circuit is connected with the synchronous rectification unit, and the charging power unit; and the input end of each phase is connected in parallel, the output end of each phase is connected in parallel and connected to the output filtering capacitor. The technical scheme of the invention is adopted, each phase BUCK circuit is independently controlled, and flow equalization adjustment is automatically performed, thus option is simpler; the topology circuit has higher conversion efficiency under the occasion of low current; and meanwhile, when one phase is in failure, other phases are not influenced, and the working state is more stable and reliable.
Description
Technical field
The present invention relates to the photovoltaic cell technical field, relate in particular to a kind of heterogeneous synchronous rectification BUCK topological circuit.
Background technology
In the prior art, the circuit design of common controller is tended to integrated, and electric current all passes through one tunnel specific circuit and circulates.The sort circuit design is more rational when little electric current flows through, and the less easy control of electric current is born the power tube of less caloric value and also on market, sought easily.But along with the rated current of controller increases, this a road single circuit design has just shown a lot of drawbacks, and is as shown in Figure 1, when the controller rated current is big, if also adopt this scheme, will inevitably cause following problem:
At first, can there be certain obstacle in the selection of power tube Q1.The power transistor of big electric current is not easy to find; Normal controller adopts field-effect transistor (MOSFET) as power switch regulating circuit voltage and electric current; Powerful be not easy to find then can only adopt a plurality of MOSFET parallel connections to bear circuital current jointly; Cause current-sharing inconsistent easily, drive loss also can correspondingly increase.Electric current is certain during charging; As long as there is other MOSFET to break down during this, then remaining MOSFET must bear this variation, and the electric current that has directly caused residue MOSFET on average to bear strengthens; Its performance must be affected, and will continue to damage if exceed its rated value.Time to peak at sunshine in one day was merely about 1～2 hour, and the most of the time controller need hour charge a battery in charging current.When charging current reduces gradually, in order to prevent the circuital current cutout, require MOSFET to be in the high-frequency work state, so its switching loss can increase, with the conversion efficiency that influences circuit greatly.
Secondly, also can there be certain obstacle in the selection of inductance L 1.Inductance carries out afterflow in order to store macro-energy, and its volume size and weight are with corresponding increase.When charging current hour, its eddy current loss is than can be very big, efficient can be very low when causing low current charge.And the inductance of so big volume and weight will influence the structural design of controller, and the profile of controller may depend on the position and the size of inductance, influences the attractive in appearance of profile thereby received certain restriction.
In like manner, the selection of output filter capacitor E2 and sustained diode 1 also can be affected, and when flowing through big electric current, fly-wheel diode also can exist energy loss and heat dissipation problem.Circuit output back ripple current can be very big, and output filter capacitor also can correspondingly be chosen bigger capacity more volume, and electric capacity itself can consume quite a few energy during its filtering, and may influence filter effect and increase cost.The pulse-width regulated of power tube needs high frequency modulated, and is also higher to the requirement of CPU in order to produce high-frequency pulse, and cost can corresponding increasing, and CPU may be in the high-frequency work state for a long time, and power consumption can increase.
Therefore, each parts of existing conventional BUCK circuit all have bigger energy loss, and the conversion efficiency of entire circuit must reduce.
Summary of the invention
The objective of the invention is to propose a kind of heterogeneous synchronous rectification BUCK topological circuit, can accomplish maximum power of photovoltaic cell point and follow the tracks of, can improve the conversion efficiency of following the tracks of the back circuit simultaneously effectively.
For reaching this purpose, the present invention adopts following technical scheme:
A kind of heterogeneous synchronous rectification BUCK topological circuit comprises main control unit and output filter capacitor, and every circuitry phase comprises capacitance energy storage unit, charge power unit, synchronous rectification unit, drive circuit, fly-wheel diode and inductive energy storage unit; Main control unit connects the drive circuit of each circuitry phase respectively, and the drive circuit of every circuitry phase is connected with synchronous rectification unit, charge power unit; The input of each phase is connected in parallel, and output also is connected in parallel and connects output filter capacitor.
Said synchronous rectification unit is that two power transistors are connected in series in the other direction.
Adopted technical scheme of the present invention, every phase BUCK circuit is controlled separately, and current-sharing is regulated and carried out automatically, thereby option is comparatively simple.Each circuit interval and alternate run, the total output after every phase BUCK circuit stack is more level and smooth, and ripple current is very little, makes storage battery absorb energy more stably.Still has high conversion rate under the little current conditions.Simultaneously, a phase fault other each is mutually unaffected, and operating state is also more reliable and more stable.
Description of drawings
Fig. 1 is the circuit diagram of conventional BUCK circuit in the prior art;
Fig. 2 is a heterogeneous synchronous rectification BUCK topological circuit structured flowchart in the specific embodiment of the invention;
Fig. 3 is based on the heterogeneous synchronous rectification BUCK topological circuit figure of FLCC control algolithm in the specific embodiment of the invention.
Embodiment
Further specify technical scheme of the present invention below in conjunction with accompanying drawing and through embodiment.
As shown in Figure 2; The heterogeneous synchronous rectification BUCK topological circuit structured flowchart that provides for the embodiment of the invention; Comprising capacitance energy storage unit, charge power unit, synchronous rectification unit, fly-wheel diode, inductive energy storage unit and output filter capacitor, also comprise main control unit and drive circuit.Main control unit connects each phase drive circuit respectively, and the drive circuit of every phase is connected with synchronous rectification unit, charge power unit; The synchronous rectification unit is that two power transistors are connected in series in the other direction, and the input of each phase is connected in parallel, and output also is connected in parallel and passes through capacitor filtering.
Here, every circuitry phase all has capacitance energy storage unit, charge power unit, synchronous rectification unit, fly-wheel diode, inductive energy storage unit and the drive circuit of oneself, the shared main control unit of each circuitry phase and an output filter capacitor.Thereby, the circuit of how many phases is arranged, what capacitance energy storage unit, charge power unit, synchronous rectification unit, fly-wheel diode, inductive energy storage unit and drive circuit are just arranged.
The embodiment of the invention is heterogeneous BUCK topological circuit parallel connection, each circuit of main control unit unified management, and a filter capacitor is exported filtering.Adopted heterogeneous circuit of synchronous rectification, made power decentralized.Thereby effective reduction power consumption has improved the controllability of the power device of product inside simultaneously greatly and has improved reliability of products greatly.And the application main control unit through heterogeneous synchronous rectification BUCK topological circuit can carry out current-sharing automatically to be regulated, and each is independent of each other between mutually, export also more smoothly, and tracking efficient and conversion efficiency have had the lifting of matter.
During for each circuitry phase work, when main control unit sent driving charge power cell signal, drive circuit can be opened the charge power unit, and charge power unit MOSFET is in conducting state, and this moment, the synchronous rectification unit was in cut-off state.The capacitance energy storage unit releases energy, and inductive energy storage unit stored energy after output capacitance filtering, charges a battery.When main control unit sends driving synchronous rectification cell signal; Drive circuit can be opened the synchronous rectification unit; Synchronous rectification unit MOSFET is in conducting state, and this moment, the charge power unit was in cut-off state, and the inductive energy storage unit constitutes continuous current circuit by the synchronous rectification unit.Can there be Dead Time in the synchronous rectification unit when turn-offing, and the effect of fly-wheel diode in circuit carried out afterflow at Dead Time exactly, accelerates the turn-off speed of synchronous rectification unit MOSFET.
Heterogeneous BUCK topological circuit parallel connection, each circuit interval and alternate run during charging.Be after last circuitry phase starts, next circuitry phase has certain time interval (but not being to wait for that last stopping mutually just starting, is the last a certain moment after starting mutually to begin to start), and other is respectively mutually all according to this rule circular flow.Every phase all has independently capacitance energy storage unit, drive circuit, charge power unit, synchronous rectification unit, fly-wheel diode, inductive energy storage unit.But main control unit has only one, and filter capacitor also has only one.
As shown in Figure 3; For being applied to the heterogeneous synchronous rectification BUCK topological circuit figure on the maximum power of photovoltaic cell point tracking control unit in the specific embodiment of the invention, comprise capacitance energy storage unit 1, main control unit 2, charge power unit 3, drive circuit 4, synchronous rectification unit 5, fly-wheel diode 6, inductive energy storage unit 7 and output filter capacitor 8 based on the FLCC control algolithm.Among Fig. 3, E1, E2, E3 are the capacitance energy storage unit, and Q11, Q21, Q31 are the charge power unit; Q12 and Q13, Q22 and Q23, Q32 and Q33 are the synchronous rectification unit; D1, D2, D3 are fly-wheel diode, and L1, L2, L3 are the inductive energy storage unit, and E4 is a filter capacitor.
This circuit comprises 3 capacitance energy storage unit, 3 charge power unit, 3 synchronous rectification unit, 3 fly-wheel diodes, 3 inductive energy storage unit and 1 output filter capacitor, also comprises 1 main control unit and 3 drive circuits.Main control unit connects 3 drive circuits respectively.The drive circuit of every phase is connected with synchronous rectification unit, charge power unit; The synchronous rectification unit is that two power transistors are connected in series in the other direction.The input of each phase is connected in parallel, and output also is connected in parallel and passes through capacitor filtering.
Special needs to be pointed out is, be example with the three-phase synchronous rectification only among Fig. 3, the three-phase synchronous rectification BUCK topological circuit that drawn, and with convenient explanation, in the practical application, the scheme that the present invention's enforcement provides can be applied in the scheme of heterogeneous synchronous rectification.
Below utilize the course of work of the first phase BUCK circuit to be example, the operation principle of the scheme that the present invention implements to provide is described.Synchronous rectification unit MOSFET Q12 is that differential concatenation is connected with MOSFET Q13.The sustained diode 1 that has been equivalent to short circuit after the synchronous rectification cell conduction like this, the synchronous rectification unit MOSFET internal resistance after the conducting is minimum, greatly reduces energy loss.When main control unit sends when closing the synchronous rectification cell signal, synchronous rectification unit MOSFET Q12 makes the control of shutoff uncontrollable because the existence of body diode can not be closed rapidly.Here differential concatenation MOSFET Q13, and its body diode is inverted, and realized the speed-sensitive switch and the controllability of synchronous rectification unit, thereby the possibility of having eliminated the common-mode conducting reaches the purpose that improves product reliability.So after the signal that turn-offs sent, the synchronous rectification unit can respond at once and reliably promptly turn-off.Can there be Dead Time in the synchronous rectification unit when turn-offing, and the effect of fly-wheel diode in circuit carried out afterflow at Dead Time exactly, accelerates the turn-off speed of synchronous rectification unit MOSFET.
After sending the signal that drives the charge power cell conduction once more when main control unit this moment; Charge power unit MOSFET Q11 begins conducting; Capacitance energy storage unit L1 begins to release energy, and fly-wheel diode is that fast diode can turn-off immediately, and the inductive energy storage unit begins stored energy; After filter capacitor E4 filtering, charge a battery.
The frequency alternate conduction and shutoff charge power unit and synchronous rectification unit of main control unit to change, i.e. variation through frequency makes output current realize the tracking of input maximum power point continuously again through the time scale of adjustment alternate conduction.
The operation principle of other each phase BUCK circuit is the same.
When controller charged, behind the first phase BUCK circuit start, (the T here was the start-up time of all BUCK circuit through T/N; N represents the number of phases) time, the second phase BUCK circuit begins to start, and passes through the 2T/N time again; Third phase BUCK circuit begins to start; Pass through the 3T/N time again, the 4th phase BUCK circuit begins to start, and has realized that so N phase BUCK circuit alternately starts and operation at interval.Its purpose makes output more level and smooth exactly, makes storage battery absorb energy stably, the high conversion efficiency of same acquisition when small-power.
To sum up, technical scheme of the present invention has following advantage:
Every phase BUCK circuit is controlled separately, and current-sharing is regulated and carried out automatically.Do not have any problem on the option, because every electric current that flows through mutually is the 1/N (N represents the number of phases) of rated current, the power transistor of general parameters is easy to find, and does not need a plurality of MOSFET parallel connections to use and the inconsistent phenomenon of generation current-sharing.And inductance chooses also and is easier to, and volume or size are the 1/N of conventional unipolar type BUCK circuit, and weight can be very not heavy yet.
Each circuit interval and alternate run that the parallel connection back is adopted; Total output after every phase BUCK circuit stack is more level and smooth; Ripple current can be very little, and output filter capacitor only need be chosen less the getting final product of capacity smaller size smaller, so greatly reduces the loss of filter capacitor self; Filter effect is also very obvious, and cost is further controlled.Reduced fluctuation, made storage battery absorb energy more stably.
When charging current was big, each phase BUCK circuit was all worked, and bears charging current jointly.Charging current hour, controller will select one mutually or wherein a few phase BUCK circuit working automatically, increase because ifs circuit is all opened the loss meeting, the low charging effect of conversion efficiency is also not obvious.Open a phase or a wherein a few phase time, the loss meeting reduces greatly, thereby most of energy is charged in the storage battery, compares with conventional unipolar type BUCK circuit, and controller still has high conversion rate under the little current conditions.
If when charging, wherein one when breaking down cisco unity malfunction mutually suddenly, other each phase operating state was not affected, and the situation of redistribution current can't take place, promptly every charging current before keeping mutually is constant.Make controller continuous firing effectively reliably.
Scattered power component all has independent heat abstractor; Be more conducive to the integral layout of controller architecture, flexible design is changeable can to receive any restriction hardly, and so the configuration design meeting of controller is changeable more more attractive in appearance; Heat dispersion is better, and operating state is also more reliable and more stable.
The above; Be merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with this technological people in the technical scope that the present invention disclosed; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (2)
1. a heterogeneous synchronous rectification BUCK topological circuit is characterized in that, comprise main control unit and output filter capacitor, every circuitry phase comprises capacitance energy storage unit, charge power unit, synchronous rectification unit, drive circuit, fly-wheel diode and inductive energy storage unit; Main control unit connects the drive circuit of each circuitry phase respectively, and the drive circuit of every circuitry phase is connected with synchronous rectification unit, charge power unit; The input of each phase is connected in parallel, and output also is connected in parallel and connects output filter capacitor.
2. heterogeneous synchronous rectification BUCK topological circuit as claimed in claim 1 is characterized in that, said synchronous rectification unit is that two power transistors are connected in series in the other direction.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103731034A (en) * | 2013-12-19 | 2014-04-16 | 陕西科技大学 | Digital voltage regulating module with high fractional load efficiency and high dynamic characteristic |
| CN104578775A (en) * | 2015-01-05 | 2015-04-29 | 深圳硕日新能源科技有限公司 | BUCK circuit and maximum power point tracking method based on same |
| CN105375604A (en) * | 2015-10-15 | 2016-03-02 | 广州菲利斯太阳能科技有限公司 | Multi-phase interleaving MPPT controller |
| CN105515382A (en) * | 2016-02-06 | 2016-04-20 | 青岛鲁渝能源科技有限公司 | Voltage stability control circuit of wireless power supply system |
| US9496791B2 (en) | 2013-09-19 | 2016-11-15 | Infineon Technologies Austria Ag | Multiphase buck converter with dynamic phase firing |
| CN106300970A (en) * | 2015-06-02 | 2017-01-04 | 光宝科技股份有限公司 | Step-down converter and step-down conversion device |
| CN106340914A (en) * | 2015-07-10 | 2017-01-18 | 矢崎总业株式会社 | Feeding device and electrical junction box |
| WO2021047387A1 (en) * | 2019-09-11 | 2021-03-18 | 苏州欧普照明有限公司 | Buck topological circuit for power supply |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US9496791B2 (en) | 2013-09-19 | 2016-11-15 | Infineon Technologies Austria Ag | Multiphase buck converter with dynamic phase firing |
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| CN104578775A (en) * | 2015-01-05 | 2015-04-29 | 深圳硕日新能源科技有限公司 | BUCK circuit and maximum power point tracking method based on same |
| CN104578775B (en) * | 2015-01-05 | 2017-11-10 | 深圳硕日新能源科技有限公司 | A kind of method of BUCK circuits and the maximum power point tracking based on BUCK circuits |
| CN106300970A (en) * | 2015-06-02 | 2017-01-04 | 光宝科技股份有限公司 | Step-down converter and step-down conversion device |
| CN106340914A (en) * | 2015-07-10 | 2017-01-18 | 矢崎总业株式会社 | Feeding device and electrical junction box |
| CN105375604A (en) * | 2015-10-15 | 2016-03-02 | 广州菲利斯太阳能科技有限公司 | Multi-phase interleaving MPPT controller |
| CN105515382A (en) * | 2016-02-06 | 2016-04-20 | 青岛鲁渝能源科技有限公司 | Voltage stability control circuit of wireless power supply system |
| CN105515382B (en) * | 2016-02-06 | 2019-04-30 | 青岛鲁渝能源科技有限公司 | A kind of controlling circuit of voltage regulation of wireless power supply system |
| WO2021047387A1 (en) * | 2019-09-11 | 2021-03-18 | 苏州欧普照明有限公司 | Buck topological circuit for power supply |
| US11751306B2 (en) | 2019-09-11 | 2023-09-05 | Suzhou Opple Lighting Co., Ltd. | Buck topological circuit for power supply |
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Application publication date: 20120613 |