CN101752879A - Device and method for charging rechargeable battery of independent generating system - Google Patents
Device and method for charging rechargeable battery of independent generating system Download PDFInfo
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- CN101752879A CN101752879A CN200810180491A CN200810180491A CN101752879A CN 101752879 A CN101752879 A CN 101752879A CN 200810180491 A CN200810180491 A CN 200810180491A CN 200810180491 A CN200810180491 A CN 200810180491A CN 101752879 A CN101752879 A CN 101752879A
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Abstract
The invention relates to a device and a method for a charging rechargeable battery of an independent generating system having a maximum power tracking function. The device comprises a DC to DC converter and a control circuit, wherein the control circuit is arranged for controlling the DC to DC converter. The method for charging the rechargeable battery comprises the steps of: starting the maximum power tracking function when the output power of the independent generating system is smaller, wherein the charging current is continuous current; adopting a pulse current charging method when the independent generating system is bigger; continuously performing the maximum power tracking function when the power is not higher than the sum of a loading power and a preset maximum pulse charging power of the rechargeable battery; stopping the maximum power tracking function once the output power of the independent generating system is higher than the sum of the loading power and the preset maximum pulse charging power; and charging with a constant voltage once the rechargeable battery voltage is higher than the constant charging voltage. The invention can efficiently promote the use ratio of the output power of the independent generating system.
Description
Technical field
The present invention relates to a kind of tool maximum power tracing (Maximum Power Point Tracking, MPPT) battery charging plant and the method thereof of the self of function (stand-alone) electricity generation system particularly need the battery charging plant and the method thereof of the independent generating system of tool maximum power tracing function about being applied to wind-force, solar power generation or other renewable source of energy generation etc.
Background technology
Conventional small self wind-force or solar power system are meant that the direct output of the electric power that this electricity generation system is produced is supplied to load and uses, and again excrescent electric power are stored in battery.When the output power of this electricity generation system is not enough, then power by this battery.This type electricity generation system adopts less place capacity usually, so it is applicable to the remote districts that electrical power trans mission/distribution system can't be powered relatively, and the also most environment that lacks the electric power resource supply that is in the zone of using this type electricity generation system is so be necessary to improve as far as possible the capacity usage ratio of this type electricity generation system.
Because the power output instability of self wind-force or solar power system, and may to be lower than load required some time, and therefore general self wind-force or solar power system all are equipped with storage battery and charging device thereof.For the effective function of utilization storage battery storage power in electricity generation system, thereby must make full use of the energy that electricity generation system produces and carry out quick charge, with power supply as load to this storage battery.Yet, if when storage battery carries out improper quick charge, easily cause damaging storage battery, promptly shorten battery life.
The traditional storage battery charging method mainly comprises: current/voltage mise-a-la-masse method (constant current/constant voltage charging method) and pulse current charge method (pulse current charging method) etc. are decided in constant-current charge method (constant current chargingmethod), constant-voltage charge method (constant voltage charging method), mixing.
In fact, possess skills separately advantage and shortcoming of aforementioned charging method.For example: little electric current constant-current charge method has long shortcoming of charging interval; Big electric current constant-current charge method has the shortcoming of damaging storage battery because of overcharging.The constant-voltage charge method when beginning to charge, is damaged the shortcoming of storage battery because of producing excessive charging current just like cause accumulator voltage to be crossed when low because of over-discharge can.Mixing is decided the current/voltage mise-a-la-masse method and still can't be improved the shortcoming that causes damaging storage battery because of large current charge.As for the pulse current charge method, its damage to storage battery is less.
Generally speaking, (for example: wind-force or solar power system) storage battery mostly adopts and decides electric current and decide voltage two-part charging, promptly adopts mixing to decide the current/voltage mise-a-la-masse method to commonly use the independent generating system of tool maximum power tracing function.When the output electric energy of this electricity generation system during less than energy requirement Pa of load institute (bearing power) and the energy requirement Pb of charge in batteries institute (the maximum charge power of deciding electric current of storage battery), this electricity generation system enters the maximum power tracing pattern; When the output electric energy of this electricity generation system during greater than the summation Pa+Pb of load institute's energy requirement and charge in batteries institute energy requirement, in order to prevent excessive charging current infringement storage battery, the output power limit of this electricity generation system is lower than the set point sum of this load institute's energy requirement and maximum charging current, that is must stops the maximum power tracing mechanism of this electricity generation system; At this moment, this electricity generation system can't Maximum Power Output, and its excess energy that can produce can't be in full force and effect is output utilization.
Fig. 1 discloses the output power curve figure of the independent generating system of commonly using tool maximum power tracing function.When this independent generating system is solar power system, its characteristics of output power curve P1, P2, P3 and P4 represent the relation of this solar power system power output and its output end voltage under different days illumination respectively, wherein the day illumination of curve P4 is the strongest, and the day illumination of curve P1 is the most weak.In addition, when this independent generating system is wind generator system, its characteristics of output power curve P1, P2, P3 and P4 represent the rotation speed relation of this wind generator system power output and its generator under different wind-force respectively, and wherein the wind speed of curve P4 wind speed time wind speed time wind speed weak and curve P1 strong, curve P2 the strongest, curve P3 is the most weak.Please refer to shown in Figure 1, wherein when the maximum power zone of curve P3 and P4 during greater than the summation Pa+Pb of load institute's energy requirement and charge in batteries institute energy requirement, to limit the summation Pa+Pb of the power output of this independent generating system, thereby cause its power output that can't in full force and effectly utilize this independent generating system (shown in the net region among Fig. 1) at load institute's energy requirement and charge in batteries institute energy requirement.
Another commonly uses solar energy pulse charging device, and as No. the 566745th, TaiWan, China patent announcement, the charging method of its announcement is similar to aforementioned charging method.Another commonly uses the charging method of the charging device of tool maximum power tracing function, disclosed the charging method of solar power system charging device for No. 2006/0174939 as U.S.'s publication, it after a charging device is exported a burning voltage, exports solar energy to storage battery and load again.When its power output during less than the summation of charge in batteries and load consumption power, this charging device can be carried out maximum power tracing mechanism; Otherwise, when its power output during greater than the summation of charge in batteries and load consumption power, this charging device stops to carry out maximum power tracing mechanism, and its power output is set in the summation of charge in batteries and load consumption power, to keep output one fixed voltage, this charging method is for deciding voltage method.
Obviously, though this No. 2006/0174939 exportable burning voltage of patent damages load with the violent change of avoiding this output voltage, and further simplied system structure, when storage battery is in when hanging down the energy storage state, its voltage is lower; At this moment, when if charging device begins to be enabled in the constant-voltage charge pattern,, thereby produce excessive charging current because the voltage difference of storage battery and charging device distance is excessive, this excessive charging current also may be damaged this charging device except the useful life that shortens storage battery.In brief, the charging method of this No. 2006/0174939 patent still is necessary further to improve its shortcoming, to avoid damaging this charging device and storage battery; In other words, when the mise-a-la-masse method of the charging device of tool maximum power tracing function and other charging methods are integrated, also still be necessary suitably to improve its shortcoming.
TaiWan, China patent disclosure communique discloses the accumulator charging method of the wind generator system of tool maximum power tracing function for No. 200825278, but this method need be used a DC-to-DC converter and pulse control (generation) circuit, and the accumulator charging method of this wind generator system comprises five kinds of mode of operations.Therefore, no matter hardware control circuit or control mode all have complicated shortcoming.
Summary of the invention
In view of this, in order to improve above-mentioned shortcoming, main purpose of the present invention provides a kind of battery charging plant of independent generating system of tool maximum power tracing function, and this battery charging plant comprises a DC-to-DC converter and a control circuit; This control circuit is controlled this DC-to-DC converter, so that this DC-to-DC converter has four mode of operations, these four mode of operations comprise maximum power tracing function, pulse current charge function, constant-voltage charge function or its combination, to reach the purpose of simplifying hardware circuit and charge mode.
Another object of the present invention provides a kind of accumulator charging method of independent generating system of tool maximum power tracing function, when the power output of this independent generating system hour, start the maximum power tracing function, its charging current is a continuous current; When the power output of this independent generating system was big, it adopted pulse charge method, and under the summation that surpasses bearing power and predetermined storage battery maximum impulse charge power, it can continue to carry out this maximum power tracing function; In case when the power output of this independent generating system reaches the summation of predetermined maximum impulse charge power greater than bearing power, end to carry out this maximum power tracing function; And in case when this battery tension surpasses a predetermined constant-voltage charge voltage, the employing constant-voltage charge.
Another object of the present invention provides a kind of accumulator charging method of independent generating system of tool maximum power tracing function, it provides four mode of operations, when the power output of independent generating system hour, start the maximum power tracing function, the charging current of its storage battery is a continuous current, if the power output of this electricity generation system is during less than bearing power, supply electric power jointly to this load by this electricity generation system and storage battery, when this cell voltage is lower than a predetermined minimum discharge voltage value, cut off this load; When the power output of this independent generating system during greater than the summation of the maximum charge power of deciding electric current of this bearing power and storage battery, it changes the employing pulse charge method, and under the summation that does not surpass this bearing power and predetermined storage battery maximum impulse charge power, it can continue to carry out this maximum power tracing function; When in case the power output of this independent generating system surpasses the summation of this bearing power and predetermined storage battery maximum impulse charge power, end to carry out this maximum power tracing function, when this battery tension surpasses predetermined constant-voltage charge voltage, adopt constant-voltage charge, preventing that this storage battery from overcharging, with the purpose of the utilance of reaching effective lifting independent generating system power output.
For achieving the above object, the present invention by the following technical solutions:
A kind of battery charging plant of independent generating system of tool maximum power tracing function comprises: DC-to-DC converter, and it has several electronic power switch elements; Control circuit, it controls the electronic power switch element of described DC-to-DC converter.
Its accumulator charging method comprises:
When the power output of electricity generation system hour, this control circuit is controlled this DC-to-DC converter and is started the maximum power tracing function, the charging current of its storage battery is a continuous current, if the power output of this electricity generation system is during less than bearing power, supply electric power jointly to this load by this electricity generation system and storage battery, when this battery tension is lower than a predetermined minimum discharge voltage value, cut off this load;
When the power output of this electricity generation system during greater than the summation of the maximum charge power of deciding electric current of this bearing power and storage battery, this control circuit is controlled this DC-to-DC converter and is adopted pulse charge method, and under the summation that does not surpass this bearing power and predetermined storage battery maximum impulse charge power, it can continue to carry out this maximum power tracing function;
When in case the power output of this electricity generation system reaches the summation of predetermined storage battery maximum impulse charge power greater than this bearing power, this control circuit is controlled this DC-to-DC converter and is ended to carry out this maximum power tracing function, and this control circuit is also controlled this DC-to-DC converter and maintained under this predetermined storage battery maximum impulse charge power and charge; And
When this battery tension was scheduled to constant-voltage charge voltage above one, this control circuit was controlled this DC-to-DC converter and is adopted constant-voltage charge, overcharges to prevent this storage battery.
The invention has the advantages that:
Charging method of the present invention utilizes this control circuit and DC-to-DC converter to select maximum power tracing function, pulse current charge function, constant-voltage charge function or its combination according to the power output and the battery condition of this electricity generation system, thereby effectively promotes the utilance of independent generating system power output.
Description of drawings
Fig. 1 is the output power curve figure that commonly uses the independent generating system of tool maximum power tracing function.
Fig. 2 is the independent generating system of the tool maximum power tracing function of preferred embodiment of the present invention and the calcspar of battery charging plant.
Fig. 2 A to Fig. 2 C is for adopting the circuit diagram of DC-to-DC converter in the battery charging plant of the independent generating system of the tool maximum power tracing function of preferred embodiment of the present invention.
Fig. 3 is the accumulator charging method output power curve figure of the independent generating system of the tool maximum power tracing function of preferred embodiment of the present invention.
Fig. 4 is the flow chart of the accumulator charging method of the independent generating system of the tool maximum power tracing function of preferred embodiment of the present invention.
Fig. 5 adopts the flow chart of maximum power tracing method for the independent generating system of the tool maximum power tracing function of preferred embodiment of the present invention.
Embodiment
In order fully to understand the present invention, hereinafter will exemplify preferred embodiment and cooperate appended graphic elaborating, and it is not in order to limit the present invention.
The battery charging plant of the independent generating system of the tool maximum power tracing function of preferred embodiment of the present invention can be applicable to wind power generation, solar power generation or other renewable source of energy generation, and it is not in order to limit the present invention.
Fig. 2 discloses the independent generating system of tool maximum power tracing function of preferred embodiment of the present invention and the calcspar of battery charging plant.Please refer to shown in Figure 2ly, the battery charger of the independent generating system of the maximum power tracing function of preferred embodiment tool of the present invention comprises independent generating system 1, DC-to-DC converter 2, control circuit 3, storage battery 4 and switch 6.This independent generating system 1 is in order to providing DC power supply, and this independent generating system 1 is chosen as solar storage battery or through the wind generator system of rectification.The input of this DC-to-DC converter 2 is connected to the output of this independent generating system 1, and the output of this DC-to-DC converter 2 then is connected in parallel to this storage battery 4, and this storage battery 4 is connected in parallel to load 5 through this switch 6, to supply electric energy to this load 5.This control circuit 3 is connected to this DC-to-DC converter 2, and it makes it have maximum power tracing function, pulse current charge function and constant-voltage charge function etc. in order to control this DC-to-DC converter 2.This control circuit 3 selects to carry out maximum power tracing function, pulse current charge function, constant-voltage charge function or its combination according to the power output of this independent generating system 1 and the state of this storage battery 4, with the purpose of the utilance of reaching effective lifting independent generating system power output.This storage battery 4 can be in order to store or the release electric energy.When the power output of this independent generating system 1 hour, this this DC-to-DC converter 2 of control circuit 3 controls is carried out these maximum power tracing functions, in the hope of utilizing the peak power output of this independent generating system 1; At this moment, the charge power of this storage battery 4 is power poor of the peak power output of this independent generating system 1 and this load 5, and its charging current is a continuous current; At this moment, adopt continuous current can charge into bigger energy than pulse current charge to these storage battery 4 chargings, and if the power output of this independent generating system 1 during less than the power of this load 5, then supply electric power jointly to this load 5 by this storage battery 4 and this independent generating system 1, when the voltage of this storage battery 4 is lower than predetermined minimum discharge voltage value, then opens this switch 6 and cut off this load 5.When the power output of this independent generating system 1 is decided the summation of power of the charge power of electric current and this load 5 greater than the maximum of this storage battery 4, this this DC-to-DC converter 2 of control circuit 3 controls is carried out pulse charge method, and under the predetermined maximum impulse charge power of power that does not surpass this load 5 and storage battery 4, carry out the maximum power tracing function, in the hope of making full use of the peak power output of this independent generating system 1.In case the power output of this independent generating system 1 is during greater than the summation of the predetermined maximum impulse charge power of the power of this load 5 and storage battery 4, this this DC-to-DC converter 2 of control circuit 3 controls ends to carry out this maximum power tracing function, this control circuit 3 is also controlled the summation that this DC-to-DC converter 2 is limited in the power output of this independent generating system 1 the predetermined maximum impulse charge power of the power of this load 5 and storage battery 4, this moment, these control circuit 3 these DC-to-DC converter 2 of control still continued to carry out the pulse current charge function, with pulse mode this storage battery 4 were charged.When the voltage of this storage battery 4 during greater than predetermined constant-voltage charge magnitude of voltage, these control circuit 3 stopping pulse charge functions, this moment, this this DC-to-DC converter 2 of control circuit 3 controls was carried out constant-voltage charge functions, to decide voltage this storage battery 4 was charged.
Adopt the circuit diagram of DC-to-DC converter in the battery charging plant of the independent generating system of the tool maximum power tracing function of Fig. 2 A to Fig. 2 C announcement preferred embodiment of the present invention.Please refer to shown in Fig. 2 A to Fig. 2 C, the present invention can adopt non-isolated DC-to-DC converter charge construction, it is selected from the buck-converter (buckconverter) of Fig. 2 A, the voltage-boosting converter (boost converter) of Fig. 2 B or liter-buck-converter (buck-boost converter) of Fig. 2 C etc., and it is not in order to limit scope of the present invention.The framework of this buck-converter, voltage-boosting converter and liter-buck-converter is to commonly use the DC-to-DC converter charge construction, will not give unnecessary details in this.Described control circuit 3 is promptly in order to control the electronic power switch element of this DC-to-DC converter 2 (buck-converter, voltage-boosting converter or liter-buck-converter), to carry out function or its combinations such as maximum power tracing, pulse current charge, constant-voltage charge.
Fig. 3 discloses the accumulator charging method output power curve figure of independent generating system of the tool maximum power tracing function of preferred embodiment of the present invention.When this independent generating system 1 is solar power system, its characteristics of output power curve P1, P2, P3 and P4 represent the relation of this solar power system power output and its output end voltage under different days illumination respectively, wherein the day illumination of curve P4 is the strongest, and the day illumination of curve P1 is the most weak.In addition, when this independent generating system 1 is wind generator system, its characteristics of output power curve P1, P2, P3 and P4 represent the rotation speed relation of this wind generator system power output and its generator under different wind-force respectively, and wherein the wind speed of curve P4 is the strongest, and the wind speed of curve P1 is the most weak.Please refer to shown in Figure 3ly, it indicates the first power-limiting Pa, the second power-limiting Pa+Pb and the 3rd power-limiting Pa+Pc; Wherein Pa is that bearing power, Pb are the maximum charge power of deciding electric current of storage battery, and Pc is predetermined storage battery maximum impulse charge power, and the 3rd power-limiting Pa+Pc is greater than the second power-limiting Pa+Pb.Greater than the 3rd power-limiting Pa+Pc, thereby it can't carry out the maximum power tracing function only when the very strong power curve P4 that causes producing of solar illuminance or wind-force in the maximum power zone (shown in the net region of Fig. 3) of curve P4.During with Fig. 3 and Fig. 1 comparison, the present invention can't in full force and effectly utilize the power output part of this independent generating system 1 much smaller than the charging device of commonly using independent generating system (as shown in Figure 1); Therefore, the battery charging plant of the independent generating system of tool maximum power tracing function of the present invention more can effectively utilize the output energy of this independent generating system 1 with respect to the charging device of commonly using independent generating system, to quicken charge in batteries speed and to shorten the charge in batteries time.
Referring again to Fig. 2 and shown in Figure 3, the battery charging plant of the independent generating system of the tool maximum power tracing function of preferred embodiment of the present invention provides four mode of operations, to carry out maximum power tracing, pulse current charge, constant-voltage charge or its combination.When the power output of independent generating system 1 is equal to or greater than this first power-limiting Pa but during less than the second power-limiting Pa+Pb, carry out first mode of operation, control circuit 3 control DC-to-DC converter 2 are carried out the maximum power tracing function, in the hope of utilizing the peak power output of this independent generating system 1; At this moment, switch 6 closures are exported a power to load 5, and the charge power of storage battery 4 is the poor of the peak power output of independent generating system 1 and load 5 power, its charging current is a continuous current, and 4 chargings can charge into bigger energy than pulse current charge to storage battery to adopt continuous current this moment; And when the power output of independent generating system 1 during less than the first power-limiting Pa, control circuit 3 control DC-to-DC converter 2 are carried out the maximum power tracing functions, this moment independent generating system 1 with storage battery 4 common supply electric power to load 5.In case when the voltage of storage battery 4 is lower than predetermined minimum discharge voltage value, forms open circuit by control switch 6, and cut off load 5, to avoid storage battery 4 over-discharge can; After cutting off load 5, still utilize the power output of independent generating system 1 to charge to storage battery 4, the preferable predetermined minimum voltage value of storage battery 4 is obtained by the minimum discharge voltage value of storage battery factory's suggestion.
Referring again to Fig. 2 and shown in Figure 3, when the power output of independent generating system 1 during greater than the second power-limiting Pa+Pb but less than the 3rd power-limiting Pa+Pc, carry out second mode of operation, this moment, storage battery 4 should not adopt the continuous current charging again, influence the life-span otherwise storage battery 4 possibilities are overheated, control circuit 3 control DC-to-DC converter 2 are carried out pulse charge method under second mode of operation, and continue to carry out the maximum power tracing function, in the hope of utilizing the peak power output of independent generating system 1; At this moment, switch 6 closures are to export a power to load 5.
Referring again to Fig. 2 and shown in Figure 3, when the power output of independent generating system 1 during, carry out the 3rd mode of operation greater than the 3rd power-limiting Pa+Pc, should not carry out the maximum power tracing function this moment again, otherwise can shorten the life-span of storage battery 4.Under the 3rd mode of operation, control circuit 3 ends to carry out the maximum power tracing function, control circuit 3 control DC-to-DC converter 2 are limited in the power output of independent generating system 1 summation of the predetermined maximum impulse charge power of the power of load 5 and storage battery 4, this moment, control circuit 3 still continued to carry out the pulse current charge function, with pulse mode storage battery 4 was charged; At this moment, switch 6 closures are to export a power to load 5.
Referring again to shown in Figure 2, when the voltage of storage battery 4 during more than or equal to predetermined constant-voltage charge magnitude of voltage A1, carry out the 4th mode of operation, should not utilize this moment pulse current charge or continuous current charging modes again, otherwise cause storage battery 4 to overcharge and shorten life-span of storage battery 4 storage battery 4 chargings.Under the 4th mode of operation, control circuit 3 stopping pulse charge functions, this moment, control circuit 3 control DC-to-DC converter 2 were carried out the constant-voltage charge function, to decide voltage storage battery 4 were charged.This preferable predetermined constant-voltage charge magnitude of voltage A1 is obtained by the recommended value of storage battery factory.At this moment, switch 6 closures, with output-power to load 5.
Fig. 4 discloses the flow chart of accumulator charging method of independent generating system of the tool maximum power tracing function of preferred embodiment of the present invention.
Shown in the 2nd to 4 figure, at first, the accumulator charging method of the independent generating system of the tool maximum power tracing function of preferred embodiment of the present invention judges that whether the voltage of storage battery 4 is less than predetermined constant-voltage charge magnitude of voltage A1.
If the voltage of storage battery 4 is not less than when being scheduled to constant-voltage charge magnitude of voltage A1, directly carry out the 4th mode of operation, control circuit 3 control DC-to-DC converter 2 are carried out the constant-voltage charge functions, to decide voltage storage battery 4 are charged;
If the voltage of storage battery 4 during less than predetermined constant-voltage charge magnitude of voltage A1, is selected execution first mode of operation or second mode of operation or the 3rd mode of operation.Wherein:
When the voltage of storage battery 4 during less than predetermined constant-voltage charge magnitude of voltage A1, whether the power output of judging independent generating system 1 is less than the second power-limiting Pa+Pb; If the power output of independent generating system 1 during less than the second power-limiting Pa+Pb, is carried out first mode of operation, carry out the maximum power tracing functions by control circuit 3 control DC-to-DC converter 2, in the hope of utilizing the peak power output of independent generating system 1; This moment switch 6 closures, export a power to load 5, the charge power of storage battery 4 is power poor of the peak power output of independent generating system 1 and load 5, its charging current is a continuous current, if the power output of this independent generating system 1 is during less than the first power-limiting Pa, storage battery 4 discharges, and storage battery 4 and independent generating system 1 provide load 5 required power jointly.Therefore, when carrying out first mode of operation, judge whether the voltage of storage battery 4 is lower than predetermined minimum voltage value; If when the voltage of storage battery 4 is lower than this predetermined minimum voltage value, forms open circuit by control switch 6, and cut off load 5, avoiding storage battery 4 over-discharge can, and the power output of utilizing independent generating system 1 is to storage battery 4 chargings.
If the power output of independent generating system 1 is during more than or equal to the second power-limiting Pa+Pb, whether the power output of then judging independent generating system 1 again is less than the 3rd power-limiting Pa+Pc.Wherein:
If the power output of independent generating system 1 is during less than the 3rd power-limiting Pa+Pc, carry out second mode of operation, these control circuit 3 control DC-to-DC converter 2 are carried out pulse charge method under second mode of operation, and continue to carry out the maximum power tracing function, in the hope of utilizing the peak power output of independent generating system 1; This moment, switch 6 closures were exported a power to load 5.Except the pulse current charge function, control circuit 3 is still controlled DC-to-DC converter 2 and is carried out the maximum power tracing function.
Otherwise, if the power output of independent generating system 1 is during more than or equal to the 3rd power-limiting Pa+Pc, carry out the 3rd mode of operation, under the 3rd mode of operation, control circuit 3 ends to carry out the maximum power tracing function, control circuit 3 control DC-to-DC converter 2 are limited in the power output of independent generating system 1 summation of the predetermined maximum impulse charge power of load 5 power and storage battery 4, this moment, control circuit 3 still continued to carry out the pulse current charge function, with pulse mode storage battery 4 was charged; This moment, switch 6 closures were exported a power to load 5.
Then, after carrying out first mode of operation, second mode of operation, the 3rd mode of operation and the 4th mode of operation, return again judge storage battery 4 voltage whether less than predetermined constant-voltage charge magnitude of voltage A1, to re-execute the judgement of mode of operation.
Fig. 5 discloses the maximum power tracing flow process mechanism that control circuit uses in the battery charging plant of independent generating system of tool maximum power tracing function of preferred embodiment of the present invention, it adopts responsibility cycle (duty cycle) perturbation scheme to follow the trail of the maximum power of this independent generating system 1, responsibility cycle is the electronic power switch ON time of this DC-to-DC converter 2 and the ratio of switching cycle, and so it is not in order to limit scope of the present invention.Please refer to shown in Figure 5ly, maximum power tracing flow process mechanism at first reads the output voltage V of this independent generating system 1
SourceAnd electric current I
Source, and calculate its power P
Source(n), again via a preceding power P
Source(n-1) and this rated output P
Source(n) manner of comparison is judged its responsibility cycle perturbation direction, as this rated output P
Source(n) greater than a preceding power P
Source(n-1) time, expression responsibility cycle perturbation direction is correct, must not change the responsibility cycle perturbation direction, i.e. D (k+1)=D (k)+Δ D.(D is a responsibility cycle, and Δ D is the variable quantity of responsibility cycle) is as this rated output P
Source(n) less than a preceding power P
Source(n-1) time, expression responsibility cycle perturbation direction is incorrect, needs to change the responsibility cycle perturbation direction, therefore carry out Δ D * (1) earlier, be D (k+1)=D (k)-Δ D, repeat above step so always and just can reach maximum power point smoothly, and rest near the disturbance back and forth maximum power point.
Aforementioned preferred embodiment only illustrates the present invention and technical characterictic thereof, the technology of this embodiment can carry out suitably still that the equivalence of various essence is modified and/or substitute mode in to implement; Therefore, interest field of the present invention should be looked the scope that claims define and is as the criterion.
Claims (16)
1. the battery charging plant of an independent generating system is characterized in that comprising:
DC-to-DC converter, it has several electronic power switch elements;
Control circuit, it controls the electronic power switch element of described DC-to-DC converter;
Wherein, the power output of independent generating system is equal to or greater than first power-limiting but during less than second power-limiting, this control circuit is controlled this DC-to-DC converter and carried out the maximum power tracing function; And when the power output of this independent generating system during less than first power-limiting, this control circuit is controlled this DC-to-DC converter and is carried out the maximum power tracing function, and this moment, this independent generating system and this storage battery were supplied electric power jointly to load;
When the power output of independent generating system during greater than second power-limiting but less than the 3rd power-limiting, this control circuit is controlled this DC-to-DC converter and is carried out pulse charge method, and continues to carry out the maximum power tracing function;
When the power output of this independent generating system during greater than the 3rd power-limiting, this control circuit ends to carry out the maximum power tracing function, this control circuit is controlled this DC-to-DC converter, the power output of this independent generating system is limited in the summation of the predetermined maximum impulse charge power of the power of this load and storage battery, this control circuit still continues to carry out the pulse current charge function, with pulse mode this storage battery is charged.
2. the battery charging plant of independent generating system as claimed in claim 1 is characterized in that:
When the voltage of this storage battery during greater than predetermined constant-voltage charge magnitude of voltage, this control circuit stopping pulse charge function, this control circuit are controlled this DC-to-DC converter and are carried out the constant-voltage charge function, to decide voltage this storage battery are charged.
3. the battery charging plant of independent generating system as claimed in claim 1 is characterized in that:
This independent generating system is connected to this storage battery through this DC-to-DC converter, and this storage battery is supplied electric energy to this load via switch.
4. the battery charging plant of independent generating system as claimed in claim 1 is characterized in that:
This control circuit is connected to this DC-to-DC converter, has maximum power tracing function, constant-voltage charge, pulse current charge function or its combination to control this DC-to-DC converter.
5. the battery charging plant of independent generating system as claimed in claim 1 is characterized in that:
When the power output of this independent generating system during less than this bearing power, it starts this maximum power tracing function, this storage battery and independent generating system supply power to this load jointly, and whether the voltage of judging this storage battery is lower than predetermined minimum discharge voltage value, when if the voltage of this storage battery is lower than this predetermined minimum discharge voltage value, form open circuit by control one switch, and cut off this load.
6. the battery charging plant of independent generating system as claimed in claim 5 is characterized in that:
Should predetermined minimum discharge voltage value be the minimum discharge voltage value of this storage battery.
7. the battery charging plant of independent generating system as claimed in claim 1 is characterized in that:
The maximum power that this control circuit adopts the responsibility cycle perturbation scheme to follow the trail of this independent generating system.
8. the battery charging plant of independent generating system as claimed in claim 7 is characterized in that:
The maximum power tracing system of this control circuit reads the input voltage and the electric current of this independent generating system, and calculates its power, judges its responsibility cycle perturbation direction via the manner of comparison of a preceding power and this rated output again; When this rated output during greater than a preceding power, the responsibility cycle perturbation direction is correct, must not change the responsibility cycle perturbation direction; When this rated output during less than a preceding power, the responsibility cycle perturbation direction is incorrect, needs to change the responsibility cycle perturbation direction.
9. the accumulator charging method of an independent generating system is characterized in that comprising following steps:
When the power output of this independent generating system during less than the summation of the maximum charge power of decide electric current of bearing power and storage battery, control circuit control DC-to-DC converter is carried out startup maximum power tracing function, and its charging current is a continuous current;
When the power output of this independent generating system during greater than the summation of the maximum charge power of deciding electric current of bearing power and storage battery, this control circuit is controlled this DC-to-DC converter and is carried out pulse charge method, and surpass under the summation of this bearing power and storage battery maximum impulse charge power in the power output of this independent generating system, it continues to carry out this maximum power tracing function;
When the power output of this independent generating system during greater than the summation of bearing power and storage battery maximum impulse charge power, this control circuit is controlled this DC-to-DC converter and is ended to carry out this maximum power tracing function, and the power output of this independent generating system is kept the summation that is controlled at this bearing power and storage battery maximum impulse charge power, the horizontal pulse of going forward side by side charging.
10. the accumulator charging method of independent generating system as claimed in claim 9 is characterized in that:
When the voltage of this storage battery during greater than predetermined constant-voltage charge magnitude of voltage, this control circuit stopping pulse charge function, this control circuit are controlled this DC-to-DC converter and are carried out the constant-voltage charge function, to decide voltage this storage battery are charged.
11. the accumulator charging method of independent generating system as claimed in claim 9 is characterized in that:
This independent generating system is connected to this storage battery through this DC-to-DC converter, and this storage battery is supplied electric energy to this load via a switch.
12. the accumulator charging method of independent generating system as claimed in claim 9 is characterized in that:
This control circuit is connected to this DC-to-DC converter, has maximum power tracing function, constant-voltage charge, pulse current charge function or its combination to control this DC-to-DC converter.
13. the accumulator charging method of independent generating system as claimed in claim 9 is characterized in that:
When the power output of this independent generating system during less than this bearing power, it starts this maximum power tracing function, this storage battery and independent generating system supply power to this load jointly, and whether the voltage of judging this storage battery is lower than predetermined minimum discharge voltage value, when if the voltage of this storage battery is lower than this predetermined minimum discharge voltage value, form open circuit by control one switch, and cut off this load.
14. the accumulator charging method of independent generating system as claimed in claim 13 is characterized in that:
Should predetermined minimum discharge voltage value be the minimum discharge voltage value of this storage battery.
15. the accumulator charging method of independent generating system as claimed in claim 9 is characterized in that:
The maximum power that adopts the responsibility cycle perturbation scheme to follow the trail of this independent generating system.
16. the accumulator charging method of independent generating system as claimed in claim 15 is characterized in that:
The maximum power tracing system of this control circuit reads the input voltage and the electric current of this independent generating system, and calculates its power, judges its responsibility cycle perturbation direction via the manner of comparison of a preceding power and this rated output again; When this rated output during greater than a preceding power, the responsibility cycle perturbation direction is correct, must not change the responsibility cycle perturbation direction; When this rated output during less than a preceding power, the responsibility cycle perturbation direction is incorrect, needs to change the responsibility cycle perturbation direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810180491.7A CN101752879B (en) | 2008-11-28 | 2008-11-28 | Device and method for charging rechargeable battery of independent generating system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810180491.7A CN101752879B (en) | 2008-11-28 | 2008-11-28 | Device and method for charging rechargeable battery of independent generating system |
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| CN101752879A true CN101752879A (en) | 2010-06-23 |
| CN101752879B CN101752879B (en) | 2014-11-12 |
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| CN200810180491.7A Active CN101752879B (en) | 2008-11-28 | 2008-11-28 | Device and method for charging rechargeable battery of independent generating system |
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