CN102857094A - Boost task switching method and system based on hysteresis control - Google Patents
Boost task switching method and system based on hysteresis control Download PDFInfo
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Abstract
The invention discloses a boost task switching method and a boost task switching system based on hysteresis control. The method comprises the steps of: switching a Boost boosting module to a non-operating state if one of three conditions is met: the input voltage changes within a range of a first voltage threshold value and a second voltage threshold value; the input voltage changes within a range greater than or equal to the second voltage threshold value; the input voltage is reduced from a value greater than or equal to the second voltage threshold value to a value greater than the first voltage threshold value but smaller than the second voltage threshold value; and switching the Boost boosting module to an operating state if one of two conditions is met: the input voltage changes within a range smaller than or equal to the first voltage threshold value; the input voltage is raised from a value smaller than or equal to the first voltage threshold value to a value greater than the first voltage threshold value but smaller than the second voltage threshold value. Through switching logical judgments, not only can the Boost operating modes be switched immediately, but also the condition that the machine cannot operate at the maximum power point due to frequent switching can be avoided.
Description
Technical field
The present invention relates to the basic electronic circuit technical field, relate in particular to a kind of Boost(the boost converter based on the loop back path that stagnates, or step-up converter, the switch DC booster circuit) work switching method and system thereof.
Background technology
Boost(the boost converter, or step-up converter), be a kind of switch DC booster circuit, it can make output voltage higher than input voltage.
MPPT(Maximum Power Point Tracking, MPPT maximum power point tracking), it is a kind of control method that improves the solar energy system energy output, so-called MPPT maximum power point tracking, namely refer to the generating voltage that control algolithm can the detecting real-time solar panels, and follow the trail of ceiling voltage current value (VI), make system with the highest efficient generating.
The ring control that stagnates also is called bang-bang control or the control of ripple adjuster, is about to output voltage and maintains in the hysteresis band centered by the internal reference voltage.
More and more come into one's own take wind-force, solar energy as the electricity generation system of representative at present, but the cost of solar energy system is high, also restricting the extensive use of solar power system, therefore how in the situation that constant the raising the efficiency of solar energy system investment just seems particularly important.
Conventional MPPT has realized MPPT maximum power point tracking, but because sometimes input voltage is too high, can make the Boost overtension in tracing process, causes the system failure or affects power generating quality.So the Boost mode of operation switched just seems particularly important.In the conventional inverter, the Boost mode of operation is not switched, when will cause like this input voltage too high, Boost voltage is excessive, causes machine-spoiled rate increase and power generating quality also to be affected.Some traditional method is also switched, but only simply switches, owing to there not being buffering area, causes the specific zone of machine frequently to be switched, and causes machine can not be operated in maximum power point.Can just not seem particularly important because of the frequent scheme that causes machine to chase after less than maximum power point of switching again so invent a kind of switching of can either working accurately.
Summary of the invention
The object of the invention is to propose a kind of Boost work switching method and system thereof based on the ring control that stagnates, make the Boost mode of operation can either in time switch and can avoid to be operated in maximum power point because of the machine that frequent switching causes.
For reaching this purpose, the present invention proposes a kind of Boost work switching method based on the ring control that stagnates, comprising:
If input voltage satisfies one of following three kinds of situations: input voltage changes within default the first voltage threshold and default second voltage threshold range; Input voltage changes within more than or equal to default second voltage threshold range; Input voltage then switches to off position with the Boost boost module by dropping to greater than default the first voltage threshold and less than default second voltage threshold value more than or equal to default second voltage threshold value; If input voltage satisfies one of following two kinds of situations: input voltage changes being less than or equal within default the first voltage threshold scope; Input voltage rises to greater than default the first voltage threshold and less than default second voltage threshold value by being less than or equal to default the first voltage threshold, then the Boost boost module is switched to operating state.
Perhaps; describedly then the Boost boost module is switched to operating state and replace with: carry out the hardware protection logic and judge, if hardware does not allow to boost, then the Boost boost module is switched to off position; if hardware allows to boost, then the Boost boost module is switched to operating state.
Further, described the first voltage threshold is 1.6968*VL+20; Described second voltage threshold value is 1.6968*VL+30, and wherein said VL is not less than 220 and be not more than 230 value for default.
The invention allows for a kind of Boost work switched system based on the ring control that stagnates, be used for carrying out switch logic and judge, specifically comprise,
If input voltage satisfies one of following three kinds of situations: input voltage changes within default the first voltage threshold and default second voltage threshold range; Input voltage changes within more than or equal to default second voltage threshold range; Input voltage then switches to off position with the Boost boost module by dropping to greater than default the first voltage threshold and less than default second voltage threshold value more than or equal to default second voltage threshold value; If input voltage satisfies one of following two kinds of situations: input voltage changes being less than or equal within default the first voltage threshold scope; Input voltage rises to greater than default the first voltage threshold and less than default second voltage threshold value by being less than or equal to default the first voltage threshold, then the Boost boost module is switched to operating state.
Perhaps; describedly then the Boost boost module is switched to operating state and replace with: carry out the hardware protection logic and judge, if hardware does not allow to boost, then the Boost boost module is switched to off position; if hardware allows to boost, then the Boost boost module is switched to operating state.
Further, described the first voltage threshold is 1.6968*VL+20; Described second voltage threshold value is 1.6968*VL+30, and wherein said VL is not less than 220 and be not more than 230 value for default.
The present invention can avoid in the course of work effectively because input voltage is excessive; the problem that causes the Boost overtension; when input voltage is high, carry out MPPT maximum power point tracking by Boost side Voltage loop; when input voltage is low, carry out MPPT maximum power point tracking by the Boost booster circuit; optimize the performance of MPPT maximum power point tracking; application by the loop back path that stagnates has reduced the number of times that switches; avoid frequent switching; can improve the ability of machine MPPT maximum power point tracking; judgement by hardware protection; can avoid switching the generation of conflict, make the Boost mode of operation can either in time switch and can avoid to be operated in because of the machine that frequent switching causes the problem of maximum power point.
Description of drawings
Fig. 1 stagnates in the embodiment of the invention one to encircle the basic principle figure of control;
Fig. 2 stagnates in the embodiment of the invention one to encircle the principle oscillogram of control;
Fig. 3 is the embodiment of the invention one described Boost work switching method schematic flow sheet based on the ring control that stagnates;
Fig. 4 is the hardware schematic diagram of the embodiment of the invention three described solar power generations;
Fig. 5 be in the embodiment of the invention three when the Boost boost module is worked the MPPT maximum power point tracking schematic diagram;
Fig. 6 be in the embodiment of the invention three when the Boost boost module is not worked the MPPT maximum power point tracking schematic diagram.
Embodiment
Further specify technical scheme of the present invention below in conjunction with accompanying drawing and by embodiment.
Embodiment one
Embodiment of the invention employing voltage-type stagnates to encircle to control and realizes Boost work switching, the basic principle that the ring that stagnates is controlled as depicted in figs. 1 and 2, Fig. 1 stagnates to encircle the basic principle figure of control, Fig. 2 is its principle waveform of ring control that stagnates, drop to VL in t0 moment output voltage VO, the in-phase end output voltage of hysteresis comparator is lower than the reference value of end of oppisite phase at this moment, and what comparator was exported is high level, the switching tube conducting, induction charging, inductive current rises, and output voltage rises, at t1 constantly, the in-phase end output voltage of hysteresis comparator has been increased to the reference value that equals end of oppisite phase, and still according to the characteristics of hysteresis comparator, comparator also will continue the original state of maintenance this moment, when this state will be maintained to VO always and rise to VH, be the t2 moment, comparator upset this moment, output voltage is low level, switching tube turn-offs, inductance is by the D afterflow, and inductive current descends, and output voltage descends, this state will be maintained to t3 constantly, i.e. the arrival of next cycle.
The ring control that stagnates is compared maximum advantage and is its response speed with other control, this is because unlike other control, the ring control that stagnates does not need slow feedback loop, in switch periods, responds the transient load electric current when transient state occurs.Its transient response time is only relevant with the delay of hysteresis comparator and drive circuit.The high-frequency filter capacitor of comparator input terminal has also increased some extra delays.These delays are mostly relevant with the selecting technology level, and therefore, it is the fastest control mode in theory that stagnant ring is controlled at.
Voltage-type other the control method of ring control ratio that stagnates has a lot of advantages, and for example: circuit is simple, does not need the compensation of feedback control loop, for load transient the synchronous response of being close to is arranged, and the switch ON time is not limited etc.The present embodiment is set forth the stagnate basic principle of ring control and Boost boost module of voltage-type, and labor the voltage-type of two the technology combinations Boost of the ring control handoff technique of working that stagnates.
The embodiment of the invention still, is compared with general stagnant ring control based on the thinking of the ring control that stagnates, and the embodiment of the invention is utilized software to replace comparator in dsp chip and realized stagnant ring control.Embodiment of the invention reference voltage is 1.6968*VL+25V, hysteresis band is 5V, VL is for default and be not less than 220 and when being not more than 230 value, being equivalent to the first voltage threshold VBoostL is 1.6968*VL+20, second voltage threshold value VBoostH is 1.6968*VL+30, if output voltage is equal to or less than the half that reference value deducts hysteresis band, controller is opened high-end MOSFET with regard to the MOSFET that disconnects low side, this is the state of opening of power stage, because it can cause the rising of output voltage; If output voltage reaches or surpass the half that reference value adds hysteresis band, controller just disconnects high-end MOSFET and opens the MOSFET of low side, and this is the off status of power stage, because it can cause the decline of output voltage.The method that the ring that stagnates is controlled can keep in the scope of output voltage hysteresis band around reference voltage.When output load current increase or the input voltage transient changing and so that output voltage be offset to beyond the hysteresis band, controller will continuously be opened or switch-off power MOSFET, output voltage is turned back in the scope of stagnant ring, under the condition that output filtering allows, will correct output voltage with the fastest speed.
Boost work handover mechanism based on the ring control that stagnates of the present invention comprises following situation:
If input voltage is in buffering area at the very start, if namely input voltage is greater than the first default voltage threshold VBoostL and less than default second voltage threshold value VBoostH, when input voltage changes in this buffering area, the Boost boost module is in off position, the Voltage Reference that the voltage given of Boost side Voltage loop provides for MPPT.
When input voltage changes from low to high, if input voltage is less than the first default voltage threshold VBoostL, judged whether hardware protection, if hardware does not turn-off Boost and drives, then the Boost boost module is in running order, and the voltage given of Boost side Voltage loop is for default tertiary voltage VBoostMin, if hardware has turn-offed the Boost driving, then the Boost boost module is in off position, the Voltage Reference that the voltage given of Boost side Voltage loop provides for MPPT; If but input voltage is greater than the first default voltage threshold VBoostL less than default second voltage threshold value VBoostH, if hardware does not turn-off Boost and drives, then the Boost boost module is in running order, the voltage given of Boost side Voltage loop is default tertiary voltage VBoostMin, if hardware has turn-offed the Boost driving, then the Boost boost module is in off position, the Voltage Reference that the voltage given of Boost side Voltage loop provides for MPPT; If input voltage is greater than default second voltage threshold value VBoostH, the Boost boost module is in off position, the Voltage Reference that the voltage given of Boost side Voltage loop provides for MPPT.
When input voltage changes from high to low, if input voltage greater than default second voltage threshold value VBoostH, the Boost boost module is in off position, the Voltage Reference that the voltage given of Boost side Voltage loop provides for MPPT.If input voltage is less than default second voltage threshold value VBoostH and greater than the first default voltage threshold VBoostL, then the Boost boost module is in off position, the Voltage Reference that the voltage given of Boost side Voltage loop provides for MPPT; If input voltage is less than the first default voltage threshold VBoostL, if hardware does not turn-off Boost and drives, then the Boost boost module is in running order, the voltage given of Boost side Voltage loop is default tertiary voltage VBoostMin, if hardware has turn-offed the Boost driving, then the Boost boost module is in off position, the Voltage Reference that the voltage given of Boost side Voltage loop provides for MPPT.
Fig. 3 is the described Boost work switching method schematic flow sheet based on the ring control that stagnates of the embodiment of the invention, and as shown in Figure 3, described Boost work switching method based on the ring control that stagnates comprises the steps:
S301, judge that whether input voltage changes between the first default voltage threshold VBoostL and the second voltage threshold value VBoostH that presets, if execution in step S309 then, otherwise execution in step S302;
Described the first default voltage threshold VBoostL and described default second voltage threshold value VBoostH are preset value, and described the first voltage threshold VBoostL is less than described default second voltage threshold value VBoostH, and described the first voltage threshold VBoostL is 1.6968*VL+20; Described second voltage threshold value VBoostH is 1.6968*VL+30; Described tertiary voltage VBoostMin is 1.6968*VL+30, and wherein said VL is not less than 220 and be not more than 230 value for default.
S302, judge that whether input voltage changes from low to high, if execution in step S303 then, otherwise execution in step S306;
S303, judge input voltage whether less than the first default voltage threshold VBoostL, if execution in step S305 then, otherwise execution in step S304;
S304, judge input voltage whether greater than default second voltage threshold value VBoostH, if execution in step S309 then, otherwise execution in step S305;
S305, judged whether hardware protection, if execution in step S309 then, otherwise execution in step S310;
S306, judge input voltage whether greater than default second voltage threshold value VBoostH, if execution in step S309 then, otherwise execution in step S307;
S307, judge input voltage whether less than the first default voltage threshold VBoostL, if execution in step S308 then, otherwise execution in step S309;
S308, judged whether hardware protection, if execution in step S309 then, otherwise execution in step S310;
Carry out the judgement of hardware protection logic, if hardware does not allow to boost, then send the hardware caution sign of Boost overvoltage, when the hardware caution sign of described Boost overvoltage occurring, the Boost boost module is in off position.
S309, Boost boost module are in off position;
S310, Boost boost module are in running order.
Described the first voltage threshold VBoostL is preferably 1.6968*VL+20; Described second voltage threshold value VBoostH is preferably 1.6968*VL+30, and wherein said VL is preferably and is not less than 220 and be not more than 230 value.
When the Boost boost module was in running order, the Boost boost module cooperated the MPPT module to boost, and carries out MPPT maximum power point tracking; When the Boost boost module was in off position, the Boost boost module carried out MPPT maximum power point tracking by the Voltage loop on the Boost booster circuit and the electric current loop in the inversion, and its specific implementation is referring to embodiment three.
Embodiment two
The described Boost work switched system based on the ring control that stagnates of the present embodiment is used for carrying out switch logic to be judged, described switch logic Rule of judgment is:
If input voltage change within default the first voltage threshold VBoostL and the default second voltage threshold value VBoostH scope, input voltage meeting or exceeding and changing within the default second voltage threshold value VBoostH scope or input voltage drops to greater than default the first voltage threshold VBoostL and within less than default second voltage threshold value VBoostH scope, then sets the Boost boost module and be in off position by meeting or exceeding default second voltage threshold value VBoostH.
If input voltage changes within less than default the first voltage threshold VBoostL scope or input voltage by rising to greater than default the first voltage threshold VBoostL less than default the first voltage threshold VBoostL and within less than default second voltage threshold value VBoostH scope; then carrying out the hardware protection logic judges; if hardware does not allow to boost; then set the Boost boost module and be in off position; if hardware allows to boost, then set the Boost boost module in running order.
During in running order the or off position of described Boost boost module, it cooperates MPPT to carry out the specific implementation of MPPT maximum power point tracking referring to embodiment three.
Described the first voltage threshold VBoostL is preferably 1.6968*VL+20; Described second voltage threshold value VBoostH is preferably 1.6968*VL+30, and wherein said VL is preferably and is not less than 220 and be not more than 230 value.
Embodiment three
In the solar power generation, realize MPPT maximum power point tracking by conventional MPPT at present, but because sometimes input voltage is too high, in tracing process, can make the Boost overtension, cause the system failure or affect power generating quality.The present embodiment is the implementation that the Boost work switching method based on the loop back path that stagnates of the present invention is used for solar power generation.Fig. 4 is the hardware schematic diagram of the described solar power generation of the present embodiment, and as shown in Figure 4, the Boost module input connects solar panel in the circuit, when Boost works, by the duty ratio that DSP power ratio control pipe drives, reaches the effect that changes input voltage Vpv; An inversion module and a digital signal processor DSP are arranged in the circuit, and the duty ratio by four power tubes of DSP control drive reaches the effect that changes output current Iinv; The DCDC module only is buffer action, mainly is exactly an isolating transformer.
Fig. 5 be in the embodiment of the invention three when the Boost boost module is worked the MPPT maximum power point tracking schematic diagram, as shown in Figure 5, when the Boost module is in running order, carry out as follows MPPT maximum power point tracking:
(1) difference between the Voltage Reference Vpv_ref that provides according to MPPT and the real input voltage Vpv, through the PI computing, obtain input current reference value Ipv_ref, wherein said Vpv_ref is provided by MPPT, its acquisition pattern and this case are irrelevant, do not set forth at this;
(2) according to the difference between the input current reference value Ipv_ref that obtains and the real input current Ipv, through the overpower current operator, i.e. PI computing obtains the duty ratio of Boost module drive;
(3) hardware passes through to change the duty ratio of Boost module drive, thereby changes input current, thereby changes input voltage, makes input voltage be operated in best operating point Vpv_ref, reaches the purpose of MPPT maximum power point tracking.
Fig. 6 be in the embodiment of the invention three when the Boost boost module is not worked the MPPT maximum power point tracking schematic diagram, as shown in Figure 6, when the Boost module is in off position, carry out as follows MPPT maximum power point tracking:
(1) input voltage that provides according to MPPT through the computing of overpower current PI, obtains output current reference value Iinv_ref with reference to the difference between Vpv_ref and the real Boost voltage Vboost;
(2) according to the difference between the output current reference value Iinv_ref that obtains and the real output current Iinv, through the PI computing, obtain the duty ratio that inversion module drives;
(3) hardware changes output current by changing the duty ratio of inversion module driving, thereby changes input voltage (this moment, input voltage was substantially equal with Boost voltage, changed simultaneously), reaches the effect of control inputs voltage.
The embodiment of the invention one described Boost work switching method and embodiment two described Boost work switched systems based on the ring control that stagnates based on the ring control that stagnates have effectively been avoided in the course of work because input voltage is excessive, the problem that causes the Boost overtension, when input voltage is high, carry out MPPT maximum power point tracking by Boost side Voltage loop, when input voltage is low, carry out MPPT maximum power point tracking by the Boost booster circuit, optimized the performance of MPPT maximum power point tracking; Application by the loop back path that stagnates has reduced the number of times that switches, and avoids frequent switching, has improved the ability of machine MPPT maximum power point tracking; Judgement by hardware protection; avoided switching the generation of conflict; make the Boost mode of operation can either in time switch and can avoid to be operated in because of the machine that frequent switching causes the problem of maximum power point; the embodiment of the invention three is the implementation based on be used for solar power generation with the Boost work switching method of loop back path of the present invention, making the switching of can either working accurately in the solar power generation process can not cause machine to chase after less than maximum power point because of frequent the switching again.
All or part of content in the technical scheme that above embodiment provides can realize by software programming, and its software program is stored in the storage medium that can read, storage medium for example: the hard disk in the computer, CD or floppy disk.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. the Boost work switching method based on the ring control that stagnates is characterized in that, if input voltage satisfies one of following three kinds of situations: input voltage changes within default the first voltage threshold and default second voltage threshold range; Input voltage changes within more than or equal to default second voltage threshold range; Input voltage then switches to off position with the Boost boost module by dropping to greater than default the first voltage threshold and less than default second voltage threshold value more than or equal to default second voltage threshold value; If input voltage satisfies one of following two kinds of situations: input voltage changes being less than or equal within default the first voltage threshold scope; Input voltage rises to greater than default the first voltage threshold and less than default second voltage threshold value by being less than or equal to default the first voltage threshold, then the Boost boost module is switched to operating state.
2. as claimed in claim 1 based on the stagnant Boost work switching method that encircles control; it is characterized in that; describedly then the Boost boost module is switched to operating state and replace with: carry out the hardware protection logic and judge; if hardware does not allow to boost; then the Boost boost module is switched to off position; if hardware allows to boost, then the Boost boost module is switched to operating state.
3. the Boost work switching method based on the ring control that stagnates as claimed in claim 1 or 2 is characterized in that, described the first voltage threshold is 1.6968*VL+20; Described second voltage threshold value is 1.6968*VL+30, and wherein said VL is not less than 220 and be not more than 230 value for default.
4. Boost work switched system based on the ring control that stagnates, it is characterized in that, be used for carrying out switch logic and judge, specifically comprise, if input voltage satisfies one of following three kinds of situations: input voltage changes within default the first voltage threshold and default second voltage threshold range; Input voltage changes within more than or equal to default second voltage threshold range; Input voltage then switches to off position with the Boost boost module by dropping to greater than default the first voltage threshold and less than default second voltage threshold value more than or equal to default second voltage threshold value; If input voltage satisfies one of following two kinds of situations: input voltage changes being less than or equal within default the first voltage threshold scope; Input voltage rises to greater than default the first voltage threshold and less than default second voltage threshold value by being less than or equal to default the first voltage threshold, then the Boost boost module is switched to operating state.
5. such as claim 3 or 4 described Boost work switched systems based on the ring control that stagnates; it is characterized in that; describedly then the Boost boost module is switched to operating state and replace with: carry out the hardware protection logic and judge; if hardware does not allow to boost; then the Boost boost module is switched to off position; if hardware allows to boost, then the Boost boost module is switched to operating state.
6. the Boost work switched system based on the ring control that stagnates as claimed in claim 5 is characterized in that, described the first voltage threshold is 1.6968*VL+20; Described second voltage threshold value is 1.6968*VL+30, and wherein said VL is not less than 220 and be not more than 230 value for default.
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| CN103618343A (en) * | 2013-10-12 | 2014-03-05 | 东风小康汽车有限公司重庆分公司 | Electric vehicle solar charger and use method thereof |
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| CN106026336A (en) * | 2016-05-21 | 2016-10-12 | 厦门科华恒盛股份有限公司 | Charging control method for preventing photovoltaic power point oscillation |
| CN106100353A (en) * | 2016-08-25 | 2016-11-09 | 西南交通大学 | DC DC changer V2hysteresis control method thereof and control device thereof |
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| CN103618343A (en) * | 2013-10-12 | 2014-03-05 | 东风小康汽车有限公司重庆分公司 | Electric vehicle solar charger and use method thereof |
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| CN106100353B (en) * | 2016-08-25 | 2018-09-11 | 西南交通大学 | DC-DC converter V2Hysteresis control method thereof and its control device |
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Application publication date: 20130102 |