CN110460142A - A kind of solar power supply circuit and its control method - Google Patents
A kind of solar power supply circuit and its control method Download PDFInfo
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- CN110460142A CN110460142A CN201910802327.3A CN201910802327A CN110460142A CN 110460142 A CN110460142 A CN 110460142A CN 201910802327 A CN201910802327 A CN 201910802327A CN 110460142 A CN110460142 A CN 110460142A
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- voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Control Of Electrical Variables (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a kind of solar power supply circuit and its control methods, it include: the first power supply circuit, the second power supply circuit, DC bus, the first power supply circuit connection DC bus and the second power supply circuit, to give described DC bus powered and charge to the second power supply circuit, second power supply circuit connects DC bus, to DC bus powered；Detection circuit is also set up between first power supply circuit and second power supply circuit, the detection circuit detects the first supply voltage of the first power supply circuit and the second supply voltage of second power supply circuit respectively, it determines difference between first supply voltage and the second supply voltage, the output voltage of first power supply circuit is controlled according to the difference.The present invention is able to carry out multi-channel DC power supply, stores the electric energy of solar energy in time, and stablizes the output valve of solar energy according to the electric energy of storage and output valve, offer direct current output that can be stable.
Description
Technical field
The present invention relates to field of new energy technologies, in particular to a kind of solar power supply circuit and its control method.
Background technique
In the prior art, capital equipment one of of the solar battery as new energy, to a certain extent, due to its cleaning
Property, volume is appropriate, and what is obtained is widely applied, and still, solar battery is needed by solar energy, and maximum disadvantage is just
Be it is unstable, in the prior art, in order to keep the stabilization to load supplying, generally supplied in such a way that battery is as auxiliary
Electricity keeps stablizing when solar energy is directly powered by adjusting the voltage that converting means exports it.However, current mode
It is the voltage that continuous detection solar energy generates in adjustment process.But although its is unstable, it is preferable in sunshine
Under state, such as the period at noon in summer, sunshine is stablized, and the electric energy of generation is also relatively stable, or in winter, although
Intensity of sunshine is inadequate, but its in one day still have stablize export when, how solar energy stablize export when, reduce pair
The adjustment of solar battery output, and how to coordinate the power supply between solar energy and battery, this is to improve the solar powered longevity
The difficult point of life, and maintain the problem of solar powered stability.
Summary of the invention
The invention proposes a kind of solar power supply circuits, comprising: the first power supply circuit, the second power supply circuit, direct current are female
Line, first power supply circuit connection DC bus and the second power supply circuit, to described DC bus powered and give second
Power supply circuit charging, second power supply circuit connect DC bus, to DC bus powered；First power supply circuit with
Detection circuit is also set up between second power supply circuit, the detection circuit detects the first power supply of the first power supply circuit respectively
Second supply voltage of voltage and second power supply circuit, it is poor between first supply voltage and the second supply voltage to determine
Value, the output voltage of first power supply circuit is controlled according to the difference.
The solar power supply circuit, first power supply circuit include solar battery, the first output port, second
Output port, voltage conversion circuit, first control circuit；First output port connects the output of second power supply circuit
End, the second output terminal mouth connect the DC bus；The voltage conversion circuit includes transformer T1, the first controllable switch
Q5, the first driving circuit, the first control circuit control first controllable switch by first driving circuit, to adjust
The switching frequency of transformer is saved, the voltage of control second output terminal mouth keeps stablizing.
The solar power supply circuit, one end of one output end of the solar battery connection inductance L1, another output
End ground connection, inductance L1 the other end connection capacitor C1, resistance R3, transformer T1 primary side one end, the capacitor C1, resistance R3
Other end connection after connect with the cathode of diode D1, the anode of diode D1 connects the other end of transformer T1 primary side,
The other end of the primary side of transformer T1 passes through one end of the first controllable switch Q5 connection variable resistance R4, variable resistance R4
The other end ground connection；The control terminal of first controllable switch Q5 connects first driving circuit, and first driving circuit includes
NPN triode Q1, PNP triode Q2.
The solar power supply circuit, the detection circuit include comparator AR1, optocoupler U1, resistance R1, variable resistance
R2, resistance R21, variable resistance R22；The one end the resistance R1 connects the anode of solar battery, the other end connection of resistance R1
One end of variable resistance R2, the other end ground connection of variable resistance R2, the other end of the resistance R1 are separately connected comparator AR1's
The anode of negative input end and optocoupler U1 outlet side, the positive input terminal of one end connection comparator AR1 of the resistance R21, resistance R21
The other end connection variable resistance R22 one end, variable resistance R22 the other end ground connection；The output end of comparator AR1 connects light
The anode of coupling U1 outlet side, the cathode ground connection of the input side of optocoupler U1, the cathode connection of the outlet side of optocoupler U1 first control
The AD analog-to-digital conversion interface of circuit processed；The detection circuit is supplied by adjusting variable resistance R2 and variable resistance R22, control first
The dividing ratios of circuit and the second power supply circuit, and partial pressure is input in comparator AR1 and carries out the first power supply circuit and
The voltage difference of two power supply circuits compares, and when being more than preset difference value, comparator AR1 exports high level and gives optocoupler U1, the light
Coupling U1 issues signal control outlet side conducting, and the AD modulus of first control circuit described in the other end communication channel of the resistance R1 turns
Alias carries out AD sampling, and the first control circuit calculated according to the result that AD is sampled, and output pwm signal is to institute
State the first controllable switch Q5.
The solar power supply circuit, second power supply circuit include battery, the second driving circuit, transformer T2,
Second controllable switch Q7, second control circuit, third output port；The anode of the battery is separately connected the first power supply circuit
Second output terminal mouth and resistance R9, capacitor C3, resistance R10, transformer T2 primary side one end, the other end difference of resistance R9
Connect one end of second driving circuit and capacitor C7, the cathode of zener diode D6, it is the other end of the capacitor C7, steady
Press the plus earth of diode D6；Second driving circuit includes NPN triode Q4, PNP triode Q5, resistance R11, described
The connecting pin of the reflection collection of the transmitting collection and PNP triode Q5 of NPN triode Q4 connects one end of the resistance R11, institute
The other end for stating resistance R11 connects the control terminal of the second controllable switch Q7, a non-controlling of the second controllable switch Q7
The other end of end connection transformer T2 primary side, the cathode of another non-controlling end connection battery of the second controllable switch Q7；
The second control circuit outputs a control signal to switching tube Q6 by output port, controls described the by control switch pipe Q6
Two driving circuits, the third output port connect the DC bus, and the third output port includes diode D5, capacitor
C4, resistance R12, resistance R13, the diode D5 anode connect one end of the transformer secondary, the diode D5
Cathode connection capacitor C4 one end, capacitor C4 the other end ground connection, resistance R12 one end connection diode D5 cathode, separately
One end connects one end of resistance R13, the other end ground connection of resistance R13, and the other end connection second control circuit of resistance R12 is adopted
Sample compares port.
A kind of method for controlling power supply of the solar power supply circuit as described in above-mentioned any one, includes the following steps:
Initialization starts power supply circuit；
Detect the voltage difference between the first power supply circuit and the second power supply circuit；
Judge whether difference is greater than a preset difference value；
If it is, acquiring the voltage of solar battery in the first power supply circuit, analog-to-digital conversion is carried out, according to the knot of analog-to-digital conversion
Fruit carries out calculation processing, obtains control command, controls the switching frequency in the first power supply circuit in voltage conversion circuit to maintain
The stabilization of output voltage；
If it is not, then controlling voltage output according to preset switching frequency.
The control method, the initialization, starting power supply circuit specifically include: solar energy when detection starting is initial
Voltage status generates switching frequency initial control values according to the solar energy initial voltage state, and according to the switching frequency
The output voltage values of initial control values control second output terminal mouth.
The control method, the DC bus connect DC load.
Advantageous effects obtained by the present invention are: the present invention is able to carry out multi-channel DC power supply, stores the sun in time
Can electric energy, and stablize according to the electric energy of storage and output valve the output valve of solar energy, offer direct current output that can be stable.This
Invention can be according to multiple-channel output be carried out, and according to the voltage difference being output between the voltage value of rear stage and solar battery
Value, it is determined whether starting adjustment switching frequency solves and carries out switching frequency adjusting always in the prior art, alleviates control electricity
Road calculates always bring fever and switching circuit constantly converts control frequency bring switching loss；As of the invention
Main improvement first is that, two-stage power supply is able to achieve by the sun, direct current supply can either be directly carried out, by transformation can be passed through
Circuit charges to the circuit of rear stage, realizes that power storage realizes power supply indirectly by charging, can adjust solar energy hair in time
The excessive situation of electric energy, is stored when electric energy is excessive in electric process, in electric energy deficiency, is powered by battery；Make
It is to pass through the voltage difference between input and output, it is determined whether start solar battery for another improvement of the invention
Voltage acquisition and detection, the adjusting number of switching frequency is reduced with this, extends the service life of circuit.
Detailed description of the invention
From following description with reference to the accompanying drawings it will be further appreciated that the present invention.Component in figure is not drawn necessarily to scale,
But it focuses on and shows in the principle of embodiment.In the figure in different views, identical appended drawing reference is specified to be corresponded to
Part.
Fig. 1 is a kind of schematic diagram of solar power supply circuit of the invention.
Fig. 2 is the schematic diagram of solar power supply circuit control method of the invention.
Specific embodiment
In order to enable the objectives, technical solutions, and advantages of the present invention are more clearly understood, below in conjunction with embodiment, to this
Invention is further elaborated；It should be appreciated that described herein, the specific embodiments are only for explaining the present invention, not
For limiting the present invention.To those skilled in the art, after access is described in detail below, other systems of the present embodiment
System, method and/or feature will become obvious.All such additional systems, method, feature and advantage are intended to be included in
It in this specification, is included within the scope of the invention, and by the protection of the appended claims.In description described in detail below
The other feature of the disclosed embodiments, and these characteristic roots will be apparent according to described in detail below.
As shown in Figure 1, for the invention proposes a kind of solar power supply circuits, comprising: the first power supply circuit, the second power supply
Circuit, DC bus, the first power supply circuit connection DC bus and the second power supply circuit, to described DC bus powered
And charge to the second power supply circuit, second power supply circuit connects DC bus, to DC bus powered；Described first
Detection circuit is also set up between power supply circuit and second power supply circuit, the detection circuit detects the first power supply circuit respectively
The first supply voltage and second power supply circuit the second supply voltage, determine first supply voltage and second power supply
Difference between voltage controls the output voltage of first power supply circuit according to the difference.
The solar power supply circuit, first power supply circuit include solar battery, the first output port, second
Output port, voltage conversion circuit, first control circuit；First output port connects the output of second power supply circuit
End, the second output terminal mouth connect the DC bus；The voltage conversion circuit includes transformer T1, the first controllable switch
Q5, the first driving circuit, the first control circuit control first controllable switch by first driving circuit, to adjust
The switching frequency of transformer is saved, the voltage of control second output terminal mouth keeps stablizing.
The solar power supply circuit, one end of one output end of the solar battery connection inductance L1, another output
End ground connection, inductance L1 the other end connection capacitor C1, resistance R3, transformer T1 primary side one end, the capacitor C1, resistance R3
Other end connection after connect with the cathode of diode D1, the anode of diode D1 connects the other end of transformer T1 primary side,
The other end of the primary side of transformer T1 passes through one end of the first controllable switch Q5 connection variable resistance R4, variable resistance R4
The other end ground connection；The control terminal of first controllable switch Q5 connects first driving circuit, and first driving circuit includes
NPN triode Q1, PNP triode Q2.
The solar power supply circuit, the detection circuit include comparator AR1, optocoupler U1, resistance R1, variable resistance
R2, resistance R21, variable resistance R22；The one end the resistance R1 connects the anode of solar battery, the other end connection of resistance R1
One end of variable resistance R2, the other end ground connection of variable resistance R2, the other end of the resistance R1 are separately connected comparator AR1's
The anode of negative input end and optocoupler U1 outlet side, the positive input terminal of one end connection comparator AR1 of the resistance R21, resistance R21
The other end connection variable resistance R22 one end, variable resistance R22 the other end ground connection；The output end of comparator AR1 connects light
The anode of coupling U1 outlet side, the cathode ground connection of the input side of optocoupler U1, the cathode connection of the outlet side of optocoupler U1 first control
The AD analog-to-digital conversion interface of circuit processed；The detection circuit is supplied by adjusting variable resistance R2 and variable resistance R22, control first
The dividing ratios of circuit and the second power supply circuit, and partial pressure is input in comparator AR1 and carries out the first power supply circuit and
The voltage difference of two power supply circuits compares, and when being more than preset difference value, comparator AR1 exports high level and gives optocoupler U1, the light
Coupling U1 issues signal control outlet side conducting, and the AD modulus of first control circuit described in the other end communication channel of the resistance R1 turns
Alias carries out AD sampling, and the first control circuit calculated according to the result that AD is sampled, and output pwm signal is to institute
State the first controllable switch Q5.
The solar power supply circuit, second power supply circuit include battery, the second driving circuit, transformer T2,
Second controllable switch Q7, second control circuit, third output port；The anode of the battery is separately connected the first power supply circuit
Second output terminal mouth and resistance R9, capacitor C3, resistance R10, transformer T2 primary side one end, the other end difference of resistance R9
Connect one end of second driving circuit and capacitor C7, the cathode of zener diode D6, it is the other end of the capacitor C7, steady
Press the plus earth of diode D6；Second driving circuit includes NPN triode Q4, PNP triode Q5, resistance R11, described
The connecting pin of the reflection collection of the transmitting collection and PNP triode Q5 of NPN triode Q4 connects one end of the resistance R11, institute
The other end for stating resistance R11 connects the control terminal of the second controllable switch Q7, a non-controlling of the second controllable switch Q7
The other end of end connection transformer T2 primary side, the cathode of another non-controlling end connection battery of the second controllable switch Q7；
The second control circuit outputs a control signal to switching tube Q6 by output port, controls described the by control switch pipe Q6
Two driving circuits, the third output port connect the DC bus, and the third output port includes diode D5, capacitor
C4, resistance R12, resistance R13, the diode D5 anode connect one end of the transformer secondary, the diode D5
Cathode connection capacitor C4 one end, capacitor C4 the other end ground connection, resistance R12 one end connection diode D5 cathode, separately
One end connects one end of resistance R13, the other end ground connection of resistance R13, and the other end connection second control circuit of resistance R12 is adopted
Sample compares port.
First control circuit, second control circuit are preferably the controllers such as DSP, ARM, including ADC analog-to-digital conversion interface, energy
The control signal such as PWM is enough exported, second control circuit further includes voltage comparison unit, external signal can be received, according to outer
Portion's signal and the reference voltage of internal preset carry out voltage comparison.1st foot of first control circuit is supply pin, can be passed through
The voltage signal of the output of voltage conversion circuit VR1, VR2, voltage conversion circuit VR1 receive the high voltage letter of the first output port
Number, it is converted to middle voltage signal and is separately input to voltage conversion circuit VR2 and the first driving circuit, voltage conversion circuit VR2 is defeated
Out to the 1st foot of first control circuit, to provide power supply to first control circuit.The middle voltage signal is returned switching tube Q3 and is mentioned
For upper pull-up voltage, voltage pull-up is carried out by resistance R8 switch tube Q3.
The 1st foot of first control circuit is power end, and the 3rd foot is AD sampling end, and the 5th foot is pwm signal output end, the
8 feet are ground terminal, only illustrate part pin function in figure, can choose any DSP or ARM for having above-mentioned function or
Person other have the control chip or control circuit of control function.Wherein, pin is illustration, is not necessarily needed
Control circuit is selected according to above-mentioned pin relationship.
The 1st foot of second control circuit is output end, is capable of providing output control signal, and the 2nd foot is power end, third
Foot is external signal input terminals, and the 4th foot is that end is arranged in reference voltage, and the 5th foot and the 8th foot are ground terminal, and the 6th foot and the 7th foot are
Biasing setting end.In figure only illustrate part pin function, can choose any DSP or ARM for having above-mentioned function or
Person other have the control chip or control circuit of control function.It may be preferred that first control circuit and the second control electricity
Road can be same control chip, such as the FPGA that control pin is more.
The battery BT1 is lithium ion battery.
As shown in Fig. 2, being the schematic diagram of solar power supply circuit control method of the invention.
A kind of method for controlling power supply of the solar power supply circuit as described in above-mentioned any one, includes the following steps:
Initialization starts power supply circuit；
Detect the voltage difference between the first power supply circuit and the second power supply circuit；
Judge whether difference is greater than a preset difference value；
If it is, acquiring the voltage of solar battery in the first power supply circuit, analog-to-digital conversion is carried out, according to the knot of analog-to-digital conversion
Fruit carries out calculation processing, obtains control command, controls the switching frequency in the first power supply circuit in voltage conversion circuit to maintain
The stabilization of output voltage；
If it is not, then controlling voltage output according to preset switching frequency.
The control method, the initialization, starting power supply circuit specifically include: solar energy when detection starting is initial
Voltage status generates switching frequency initial control values according to the solar energy initial voltage state, and according to the switching frequency
The output voltage values of initial control values control second output terminal mouth.
The control method, the DC bus connect DC load.The DC load includes electric car, battery
Deng the present invention can be preferably used in the electrical changing station of electric car, a station can be changed for electric car provide stable direct current and supply
Power supply.
Advantageous effects obtained by the present invention are: the present invention is able to carry out multi-channel DC power supply, stores the sun in time
Can electric energy, and stablize according to the electric energy of storage and output valve the output valve of solar energy, offer direct current output that can be stable.This
Invention can be according to multiple-channel output be carried out, and according to the voltage difference being output between the voltage value of rear stage and solar battery
Value, it is determined whether starting adjustment switching frequency solves and carries out switching frequency adjusting always in the prior art, alleviates control electricity
Road calculates always bring fever and switching circuit constantly converts control frequency bring switching loss；As of the invention
Main improvement first is that, two-stage power supply is able to achieve by the sun, direct current supply can either be directly carried out, by transformation can be passed through
Circuit charges to the circuit of rear stage, realizes that power storage realizes power supply indirectly by charging, can adjust solar energy hair in time
The excessive situation of electric energy, is stored when electric energy is excessive in electric process, in electric energy deficiency, is powered by battery；Make
It is to pass through the voltage difference between input and output, it is determined whether start solar battery for another improvement of the invention
Voltage acquisition and detection, the adjusting number of switching frequency is reduced with this, extends the service life of circuit.
Although describing the present invention by reference to various embodiments above, but it is to be understood that of the invention not departing from
In the case where range, many changes and modifications can be carried out.Therefore, be intended to foregoing detailed description be considered as it is illustrative and
It is unrestricted, and it is to be understood that following following claims (including all equivalents) is intended to limit spirit and model of the invention
It encloses.The above embodiment is interpreted as being merely to illustrate the present invention rather than limit the scope of the invention.It is reading
After the content of record of the invention, technical staff can be made various changes or modifications the present invention, these equivalence changes and
Modification equally falls into the scope of the claims in the present invention.
Claims (8)
1. a kind of solar power supply circuit characterized by comprising the first power supply circuit, the second power supply circuit, DC bus,
The first power supply circuit connection DC bus and the second power supply circuit, to give described DC bus powered and power to second
Circuit charging, second power supply circuit connect DC bus, to DC bus powered；First power supply circuit with it is described
Detection circuit is also set up between second power supply circuit, the detection circuit detects the first supply voltage of the first power supply circuit respectively
With the second supply voltage of second power supply circuit, difference between first supply voltage and the second supply voltage is determined,
The output voltage of first power supply circuit is controlled according to the difference.
2. solar power supply circuit as described in claim 1, which is characterized in that first power supply circuit includes solar-electricity
Pond, the first output port, second output terminal mouth, voltage conversion circuit, first control circuit；First output port connects institute
The output end of the second power supply circuit is stated, the second output terminal mouth connects the DC bus；The voltage conversion circuit includes
Transformer T1, the first controllable switch Q5, the first driving circuit, the first control circuit are controlled by first driving circuit
First controllable switch, to adjust the switching frequency of transformer, the voltage of control second output terminal mouth keeps stablizing.
3. solar power supply circuit as claimed in claim 2, which is characterized in that one output end of the solar battery connection electricity
Feel one end of L1, another output end ground connection, the other end connection capacitor C1 of inductance L1, resistance R3, transformer T1 primary side one
End, the capacitor C1, resistance R3 other end connection after connect with the cathode of diode D1, the anode of diode D1 connection transformation
The other end of the other end of device T1 primary side, the primary side of transformer T1 passes through the first controllable switch Q5 connection variable resistance
One end of R4, the other end ground connection of variable resistance R4；The control terminal of first controllable switch Q5 connects first driving circuit, institute
Stating the first driving circuit includes NPN triode Q1, PNP triode Q2.
4. solar power supply circuit as claimed in claim 2, which is characterized in that the detection circuit includes comparator AR1, light
Coupling U1, resistance R1, variable resistance R2, resistance R21, variable resistance R22；The one end the resistance R1 is connecting solar battery just
End, one end of the other end connection variable resistance R2 of resistance R1, the other end ground connection of variable resistance R2, the resistance R1's is another
End is separately connected the negative input end of comparator AR1 and the anode of optocoupler U1 outlet side, and one end of the resistance R21 connects comparator
The positive input terminal of AR1, one end of the other end connection variable resistance R22 of resistance R21, the other end ground connection of variable resistance R22；Than
The anode of output end connection optocoupler U1 outlet side compared with device AR1, the cathode ground connection of the input side of optocoupler U1, the outlet side of optocoupler U1
Cathode connect the AD analog-to-digital conversion interface of the first control circuit；The detection circuit passes through adjusting variable resistance R2 and can
Power transformation hinders R22, controls the dividing ratios of the first power supply circuit and the second power supply circuit, and partial pressure is input in comparator AR1
The voltage difference for carrying out the first power supply circuit and the second power supply circuit compares, and when being more than preset difference value, comparator AR1 output is high
Level gives optocoupler U1, and the optocoupler U1 issues signal control outlet side conducting, the described in the other end communication channel of the resistance R1
The AD analog-to-digital conversion interface of one control circuit, carries out AD sampling, and the first control circuit is counted according to the result that AD is sampled
It calculates, and output pwm signal is to the first controllable switch Q5.
5. solar power supply circuit as described in claim 1, which is characterized in that second power supply circuit includes battery,
Two driving circuits, transformer T2, the second controllable switch Q7, second control circuit, third output port；The anode of the battery point
Do not connect the first power supply circuit second output terminal mouth and resistance R9, capacitor C3, resistance R10, transformer T2 primary side one
End, the other end of resistance R9 are separately connected the cathode of one end of second driving circuit and capacitor C7, zener diode D6,
The plus earth of the other end, zener diode D6 of the capacitor C7；Second driving circuit includes NPN triode Q4, PNP
Triode Q5, the transmitting collection of resistance R11, the NPN triode Q4 are connected with the connecting pin collected of reflecting of the PNP triode Q5
One end of the resistance R11, the other end of the resistance R11 connect the control terminal of the second controllable switch Q7, and described second
The other end of the non-controlling end connection transformer T2 primary side of controllable switch Q7, another non-control of the second controllable switch Q7
The cathode of connection battery in end processed；The second control circuit outputs a control signal to switching tube Q6 by output port, passes through control
Switching tube Q6 processed controls second driving circuit, and the third output port connects the DC bus, the third output
Port includes the anode connection transformer secondary output of diode D5, capacitor C4, resistance R12, resistance R13, the diode D5
One end of side, one end of the cathode connection capacitor C4 of the diode D5, the other end ground connection of capacitor C4, one end of resistance R12
The cathode of diode D5 is connected, the other end connects one end of resistance R13, and the other end ground connection of resistance R13, resistance R12's is another
Port is compared in the sampling of end connection second control circuit.
6. a kind of method for controlling power supply of the solar power supply circuit as described in claim 1-5 any one, which is characterized in that packet
Include following steps:
Initialization starts power supply circuit；
Detect the voltage difference between the first power supply circuit and the second power supply circuit；
Judge whether difference is greater than a preset difference value；
If it is, acquiring the voltage of solar battery in the first power supply circuit, analog-to-digital conversion is carried out, according to the knot of analog-to-digital conversion
Fruit carries out calculation processing, obtains control command, controls the switching frequency in the first power supply circuit in voltage conversion circuit to maintain
The stabilization of output voltage；
If it is not, then controlling voltage output according to preset switching frequency.
7. control method as claimed in claim 6, which is characterized in that the initialization, starting power supply circuit specifically include: inspection
Solar energy initial voltage state when starting is surveyed, switching frequency is generated according to the solar energy initial voltage state and is initially controlled
Value, and according to the output voltage values of switching frequency initial control values control second output terminal mouth.
8. control method as claimed in claim 7, which is characterized in that the DC bus connects DC load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910802327.3A CN110460142B (en) | 2019-08-28 | 2019-08-28 | Solar power supply circuit and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910802327.3A CN110460142B (en) | 2019-08-28 | 2019-08-28 | Solar power supply circuit and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110460142A true CN110460142A (en) | 2019-11-15 |
| CN110460142B CN110460142B (en) | 2020-05-08 |
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