CN206807288U - A kind of three level boost system with one power - Google Patents

A kind of three level boost system with one power Download PDF

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Publication number
CN206807288U
CN206807288U CN201720377738.9U CN201720377738U CN206807288U CN 206807288 U CN206807288 U CN 206807288U CN 201720377738 U CN201720377738 U CN 201720377738U CN 206807288 U CN206807288 U CN 206807288U
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diode
switch pipe
output
voltage
inductance
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曹彦哲
惠瑜
王波
梁欢迎
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TBEA Xinjiang Sunoasis Co Ltd
TBEA Xian Electric Technology Co Ltd
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TBEA Xinjiang Sunoasis Co Ltd
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Abstract

A kind of three level boost system with one power, the system include input power, input capacitance, inductance, the first and second boosted switch pipes, the first and second diodes, equalizing capacitance, clamp diode, bypass diodes, the first and second output capacitances and sampling and control circuit;The utility model need to only use a bypass diode, and boost, which can be lost, when boost is operated in bypass patterns reduces by one times, and then improves system effectiveness, can reduce system cost again;When boost is operated in boost mode, switching tube can be operated in alternate conduction pattern, and the frequency of inductance will be twice of switching tube frequency, can so effectively reduce inductance L volume, loss and cost.

Description

A kind of three level boost system with one power
Technical field
It the utility model is related to boost field of circuit technology, and in particular to a kind of three level boost system with one power.
Background technology
Boost circuit is widely used in various power supply products as a kind of most basic DC/DC topologys, and photovoltaic generation Photovoltaic combining inverter uses two-stage topologies in system, and the Boost circuit of prime can both improve and the stable sun The output voltage of energy photovoltaic cell, it can be controlled again with maximal power tracing and be put into prime step-up side, it is simple and convenient.Extensively should at present There are two level and three-level topology used in the DC side topological structure of photovoltaic DC-to-AC converter, and with the input electricity of photovoltaic generating system More and more higher is pressed, the pressure-resistant of power tube has been unsatisfactory for the market demand in two level topological structures, and three-level Boost converter phase Than two level Boost converters, the voltage stress of its device can reduce half, therefore will be used widely.
When inverter is operated in first class mode, i.e. boost circuits do not work, and to reduce boost losses, current is uncommon The level boost topological structures of ground three can increase by two bypass diodes, and can bring following two after increasing bypass diodes Individual shortcoming:1.boost systems can not be operated in interleaving mode, can so increase volume and the loss of main inductance;2. it is operated in one Bypass diodes have a strong impact on inverter efficiency, entered due to making system loss increase accordingly using two during level pattern And influence generated energy.
The content of the invention
In order to solve the above technical problems, the utility model provides a kind of three level boost system with one power, can effectively solve Two problems existing for current three level boost topologys.
In order to achieve the above object, the utility model adopts the following technical scheme that:
A kind of three level boost system with one power, including input power, input power is in parallel with input capacitance C1 and input is electric Positive terminal the series inductance L, the first boosted switch pipe Q1 in source and the second boosted switch pipe Q2 are connected in series in inductance L and input electricity Source negative pole end, inductance L output end the first diode D1 of series connection, the first diode D1 anode are connected with inductance L output end Connect, the first diode D1 negative electrode is connected with the second diode D2 anode, the second diode D2 negative electrode and late-class circuit It is connected, the first output capacitance C3 is together in series with the second output capacitance C4, the first output capacitance C3 positive pole and the two or two pole Pipe D2 negative electrode is connected, and the second output capacitance C4 negative pole is connected with input power negative pole end, or passes through another inductance It is connected with input power negative pole end, equalizing capacitance C2 positive pole connects the first diode D1 negative electrode, and equalizing capacitance C2's is negative Pole is connected on the tie point that the first boosted switch pipe Q1 and the second boosted switch pipe Q2 are connected in series, clamp diode D3 sun Pole is connected with equalizing capacitance C2 negative pole, the centered level output end of clamp diode D3 negative electrode as three level, with rear class Circuit is connected;Bypass diodes D4 anode is connected to inductance L input, and bypass diodes D4 negative electrode is connected to First output capacitance C3 positive pole, or bypass diode D4 are replaced using relay K, pass through control relay K adhesive And when the system is operated in bypass patterns, further reduce system loss;Sampling and control unit are respectively from input supply terminal Sample the voltage u of input supply terminalpvWith electric current ipv, sample the first ac output voltage u from ac output enddc1, second exchange Output voltage udc2, and the 3rd ac output voltage udc3, the voltage u of the input supply terminalpvWith electric current ipvSample At the positive pole of input power, the first ac output voltage udc1Sample in the second diode D2 cathode terminal, institute State the second ac output voltage udc2Sample in clamp diode D3 cathode terminal, the 3rd ac output voltage udc3 Sample in the first diode D1 cathode terminal, the output drive signal of the sampling and control unit respectively with first liter Compress switch pipe Q1 grid and the second boosted switch pipe Q2 grid is connected, the on off state for controlling switch pipe.Work In bypass patterns, electric power outputting current reaches late-class circuit directly through bypass diodes D4 or relay K, it is only necessary to One bypass diode, system loss is effectively reduced, improve inverter efficiency, and then improve generated energy;Use clamper two Pole pipe D3, the first boosted switch pipe Q1 and the second on high-tension side voltage stress of boosted switch pipe Q2 are clamped to positive and negative busbar respectively The magnitude of voltage at voltage, i.e. the first output capacitance C3 and the second output capacitance C4 both ends, pressure-resistant relatively low switching tube so may be selected, And then system cost can be reduced;
It is operated in boost mode, the first boosted switch pipe Q1 and the second boosted switch pipe Q2 in BOOST circuits is staggeredly led Logical, when the first boosted switch pipe Q1 is turned on, electric current flows through inductance L, the first boosted switch pipe Q1, equalizing capacitance by input power C2, the second diode D2 return to the negative pole of input power by late-class circuit again;And during the second boosted switch pipe Q2 conductings, electric current Inductance L, the first diode D1, equalizing capacitance C2, the second boosted switch pipe Q2 are flowed through by input power and return to the negative of input power Pole;By controlling the first boosted switch pipe Q1 and the second boosted switch pipe Q2 dutycycle of opening, and then control equalizing capacitance C2 The voltage at both ends, make it equal to the voltage of the half of output voltage, the first boosted switch pipe Q1 and the second boosted switch pipe Q2 The half of output voltage values is controlled as, pressure-resistant relatively low switching tube so may be selected, and then reduce system cost;Use Alternate conduction pattern can be operated in during bypass diode D4, such inductance L frequency is twice of switching tube frequency, is effectively subtracted Small inductor L volume, loss and cost, and then system loss and cost can be reduced.
The control method of the three level boost system with one power, comprises the following steps:
1), sampled first by analog-to-digital conversion AD and obtain busbar voltage Ubus, equalizing capacitance voltage Umiddc;Then by bus Voltage UbusHalf and equalizing capacitance voltage UmiddcAfter making difference, midpoint dutycycle MidD is obtained by PI controllers;
2) Boost inductive currents I, is sampledboostWith current reference value Iboost *After making difference, always accounted for by PI controllers Sky compares Duty;
3), total dutycycle Duty and midpoint dutycycle are subtracted each other, then with obtaining the first boosted switch pipe after carrier wave ratio Q1 dutycycle UpDuty;Total dutycycle Duty is added with midpoint dutycycle, then opened with obtaining the second boosting after carrier wave ratio Close pipe Q2 dutycycle DownDuty;If total dutycycle Duty is more than or equal to 0.5, the boostings of the first boosted switch pipe Q1 and second Switching tube Q2 carrier phases differ 180 °, realize that the first boosted switch pipe Q1 and the second boosted switch pipe Q2 is staggeredly turned on, if always Dutycycle is less than 0.5, then the first boosted switch pipe Q1 and the second boosted switch pipe Q2 carrier phase synchronizations, realize that the first boosting is opened Pass pipe Q1 and the second boosted switch pipe Q2 is same to be opened with pass.
Compared to the prior art, the utility model possesses following advantage:
1. need to use a bypass diodes D4, boost that boost can be lost when being operated in bypass patterns reduces One times, and then system effectiveness is improved, system cost can be reduced again;
When 2.boost is operated in boost mode, switching tube can be operated in alternate conduction pattern, and inductance L frequency will be out Twice of pipe frequency is closed, can so effectively reduce inductance L volume, loss and cost;
When 3.boost is operated in bypass patterns, increase a clamp diode D3, switching tube Q1, Q2 voltage can be made Value is clamped to positive and negative busbar electric capacity, i.e. C3, C4 both end voltage;And boost is when being operated in boost mode, by controlling Q1, Q2 Dutycycle is opened, and then controls the voltage at equalizing capacitance C2 both ends, makes it equal to the half of output voltage, switching tube Q1, Q2's Voltage is also controlled by the half for output voltage values.Can so solve the problems, such as boost power pipe unbalanced-voltage-division, so as to reduce power The voltage stress of pipe, improve product quality and reduce cost.
4. the utility model boost systems can not only be operated in >=0.5 dutycycle but also can be operated in < 0.5 dutycycle Mode of operation, realize wider working range.
Brief description of the drawings
Fig. 1 is the utility model three level boost topological diagrams altogether.
Fig. 2 is bypass mode of operations.
Fig. 3 is working circuit diagram when Q1 is turned on.
Fig. 4 is working circuit diagram when Q2 is turned on.
Fig. 5 is three level boost control block diagrams (Duty altogether>0.5)
Fig. 6 is the utility model three level boost topological diagrams alternative one altogether.
Fig. 7 is the utility model three level boost topological diagrams alternative two altogether.
Embodiment
Shown embodiment is further described to the utility model below in conjunction with the accompanying drawings.
As shown in figure 1, the utility model three level boost system with one power of one kind, including input power, input power with it is defeated Enter electric capacity C1 in parallel and positive terminal the series inductance L, the first boosted switch pipe Q1 of input power and the second boosted switch pipe Q2 go here and there Connection is connected to inductance L and input power negative pole end, inductance L output end the first diode D1 of series connection, the first diode D1 sun Pole is connected with inductance L output end, and the first diode D1 negative electrode is connected with the second diode D2 anode, the two or two pole Pipe D2 negative electrode is connected with late-class circuit, and the first output capacitance C3 is together in series with the second output capacitance C4, the first output electricity The positive pole for holding C3 is connected with the second diode D2 negative electrode, and the second output capacitance C4 negative pole is connected with input power negative pole end Connect, equalizing capacitance C2 positive pole connects the first diode D1 negative electrode, and equalizing capacitance C2 negative pole is connected to the first boosted switch On the tie point that pipe Q1 and the second boosted switch pipe Q2 are connected in series, clamp diode D3 anode and equalizing capacitance C2 negative pole Connection, the centered level output end of clamp diode D3 negative electrode as three level, is connected with late-class circuit;The poles of bypass bis- Pipe D4 anode is connected to inductance L input, and bypass diodes D4 negative electrode is connected to the first output capacitance C3 positive pole; Sampling and control unit are respectively from the voltage u of input supply terminal sampling input supply terminalpvWith electric current ipv, adopted from ac output end The first ac output voltage of sample udc1, the second ac output voltage udc2, and the 3rd ac output voltage udc3, the input power The voltage u at endpvWith electric current ipvSample at the positive pole of input power, the first ac output voltage udc1Sampling Point is positioned at the second diode D2 cathode terminal, the second ac output voltage udc2Sample in clamp diode D3's Cathode terminal, the 3rd ac output voltage udc3Sample in the first diode D1 cathode terminal, the sampling and control The output drive signal of unit is connected with the first boosted switch pipe Q1 grid and the second boosted switch pipe Q2 grid respectively, On off state for controlling switch pipe.
When being operated in bypass patterns, i.e. boost circuits are operated in not boost mode, electric power outputting current directly through Bypass diodes D4 or relay K reaches late-class circuit, as shown in Fig. 2 and existing topology altogether needs to adopt in this pattern With 2 bypass diodes, so as to increase boost losses, and topological structure of the present utility model only needs a bypass bis- Pole pipe, system loss is effectively reduced, improve inverter efficiency, and then improve generated energy;The utility model uses the pole of clamper two Pipe D3, the first boosted switch pipe Q1 and the second on high-tension side voltage stress of boosted switch pipe Q2 are clamped to positive and negative busbar electricity respectively The magnitude of voltage at pressure, i.e. the first output capacitance C3 and the second output capacitance C4 both ends, pressure-resistant relatively low switching tube so may be selected, enter And system cost can be reduced.
When circuit works, i.e. boost circuits are operated in boost mode, the first boosted switch pipe Q1 in BOOST circuits with Second boosted switch pipe Q2 is staggeredly turned on, and when the first boosted switch pipe Q1 is turned on, electric current flows through inductance L, first by input power Boosted switch pipe Q1, equalizing capacitance C2, the second diode D2 return to the negative pole of input power by late-class circuit again, such as Fig. 3 institutes Show;And the second boosted switch pipe Q2 turn on when, electric current by input power flow through inductance L, the first diode D1, equalizing capacitance C2, Second boosted switch pipe Q2 returns to the negative pole of input power, as shown in Figure 4;By controlling the first boosted switch pipe Q1 and second liter Compress switch pipe Q2 dutycycle of opening, and then controls the voltage at equalizing capacitance C2 both ends, makes it equal to the half of output voltage, the One boosted switch pipe Q1 and the second boosted switch pipe Q2 voltage are also controlled by the half for output voltage values, so may be selected resistance to Relatively low switching tube is pressed, and then reduces system cost;Alternate conduction pattern can be operated in during using bypass diode D4, so Inductance L frequency is twice of switching tube frequency, effectively reduces inductance L volume, loss and cost, and then can reduce system Loss and cost.
As shown in figure 5, the control method of three level boost system with one power described in the utility model, comprises the following steps:
1), sampled first by analog-to-digital conversion AD and obtain busbar voltage Ubus, equalizing capacitance voltage Umiddc;Then by bus Voltage UbusHalf and equalizing capacitance voltage UmiddcAfter making difference, midpoint dutycycle MidD is obtained by PI controllers;
2) Boost inductive currents I, is sampledboostWith current reference value Iboost *After making difference, always accounted for by PI controllers Sky compares Duty;
3), total dutycycle Duty and midpoint dutycycle are subtracted each other, then with obtaining the first boosted switch pipe after carrier wave ratio Q1 dutycycle UpDuty;Total dutycycle Duty is added with midpoint dutycycle, then opened with obtaining the second boosting after carrier wave ratio Close pipe Q2 dutycycle DownDuty;If total dutycycle Duty is more than or equal to 0.5, the boostings of the first boosted switch pipe Q1 and second Switching tube Q2 carrier phases differ 180 °, realize that the first boosted switch pipe Q1 and the second boosted switch pipe Q2 is staggeredly turned on, if always Dutycycle is less than 0.5, then the first boosted switch pipe Q1 and the second boosted switch pipe Q2 carrier phase synchronizations, realize that the first boosting is opened Pass pipe Q1 and the second boosted switch pipe Q2 is same to be opened with pass.
As shown in fig. 6, the utility model bypass diodes D4 can also be replaced with a relay K, by controlling relay Device K adhesive and when the system is operated in bypass patterns, further reduce system loss, but system complexity can be increased, And increase cost.
As shown in fig. 7, boost inductance is not limited to single induction structure, can be Fig. 7 the first inductance L1 and the second inductance L2。
Alternative can also be the combination between above-mentioned alternative.

Claims (1)

  1. A kind of 1. three level boost system with one power, it is characterised in that:Including input power, input power and input capacitance C1 are simultaneously Join and positive terminal the series inductance L, the first boosted switch pipe Q1 of input power and the second boosted switch pipe Q2 are connected in series in electricity Feel L and input power negative pole end, inductance L the first diode D1, the first diode D1 of output end series connection anode is with inductance L's Output end is connected, and the first diode D1 negative electrode is connected with the second diode D2 anode, the second diode D2 negative electrode It is connected with late-class circuit, the first output capacitance C3 is together in series with the second output capacitance C4, the first output capacitance C3 positive pole It is connected with the second diode D2 negative electrode, the second output capacitance C4 negative pole is connected with input power negative pole end, Huo Zhetong Cross another inductance with input power negative pole end to be connected, equalizing capacitance C2 positive pole connects the first diode D1 negative electrode, presses Electric capacity C2 negative pole is connected on the tie point that the first boosted switch pipe Q1 and the second boosted switch pipe Q2 are connected in series, clamper two Pole pipe D3 anode is connected with equalizing capacitance C2 negative pole, and clamp diode D3 negative electrode exports as the centered level of three level End, is connected with late-class circuit;Bypass diodes D4 anode is connected to inductance L input, and bypass diodes D4 Negative electrode is connected to the first output capacitance C3 positive pole, or replaces bypass diode D4 using relay K, by controlling relay Device K adhesive and when the system is operated in bypass patterns, further reduce system loss;Sampling and control unit are respectively from defeated Enter the voltage u of power end sampling input supply terminalpvWith electric current ipv, the first ac output end voltage is sampled from ac output end udc1, the second ac output end voltage udc2, and the 3rd ac output end voltage udc3, the voltage u of the input supply terminalpvAnd electricity Flow ipvSample at the positive pole of input power, the first ac output voltage udc1Sample in the two or two pole Pipe D2 cathode terminal, the second ac output voltage udc2Sample in clamp diode D3 cathode terminal, the described 3rd Ac output voltage udc3Sample in the first diode D1 cathode terminal, the output driving of the sampling and control unit Signal is connected with the first boosted switch pipe Q1 grid and the second boosted switch pipe Q2 grid respectively, for controlling switch pipe On off state.
CN201720377738.9U 2017-04-12 2017-04-12 A kind of three level boost system with one power Active CN206807288U (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107070215A (en) * 2017-04-12 2017-08-18 特变电工西安电气科技有限公司 A kind of three level boost system with one power and its control method
CN108712075A (en) * 2018-06-21 2018-10-26 哈尔滨理工大学 A kind of high-gain fuel cell car DC/DC transformer configurations and control method
CN108847769A (en) * 2018-06-22 2018-11-20 阳光电源股份有限公司 Three level BOOST devices of one kind and its control method
CN109742948A (en) * 2019-01-30 2019-05-10 上能电气股份有限公司 A kind of tri-lever boosting circuit
CN110165888A (en) * 2019-06-11 2019-08-23 阳光电源股份有限公司 Three level Boost circuits, multiple-channel output parallel system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107070215A (en) * 2017-04-12 2017-08-18 特变电工西安电气科技有限公司 A kind of three level boost system with one power and its control method
CN107070215B (en) * 2017-04-12 2023-05-16 特变电工西安电气科技有限公司 Three-level boost common-ground system and control method thereof
CN108712075A (en) * 2018-06-21 2018-10-26 哈尔滨理工大学 A kind of high-gain fuel cell car DC/DC transformer configurations and control method
CN108847769A (en) * 2018-06-22 2018-11-20 阳光电源股份有限公司 Three level BOOST devices of one kind and its control method
CN108847769B (en) * 2018-06-22 2020-03-24 阳光电源股份有限公司 Three-level BOOST device and control method thereof
CN109742948A (en) * 2019-01-30 2019-05-10 上能电气股份有限公司 A kind of tri-lever boosting circuit
CN110165888A (en) * 2019-06-11 2019-08-23 阳光电源股份有限公司 Three level Boost circuits, multiple-channel output parallel system

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