CN208046476U - A kind of photovoltaic DC-to-AC converter and photovoltaic inversion equipment - Google Patents
A kind of photovoltaic DC-to-AC converter and photovoltaic inversion equipment Download PDFInfo
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- CN208046476U CN208046476U CN201820469199.6U CN201820469199U CN208046476U CN 208046476 U CN208046476 U CN 208046476U CN 201820469199 U CN201820469199 U CN 201820469199U CN 208046476 U CN208046476 U CN 208046476U
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- 238000002955 isolation Methods 0.000 claims abstract description 35
- 238000005070 sampling Methods 0.000 claims abstract description 34
- 230000003750 conditioning effect Effects 0.000 claims abstract description 24
- 238000001914 filtration Methods 0.000 claims abstract description 5
- 238000004891 communication Methods 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000005611 electricity Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The utility model is related to inverter technology field more particularly to a kind of photovoltaic DC-to-AC converter and photovoltaic inversion equipment.Photovoltaic DC-to-AC converter includes：Inverter circuit, Hall sensor, light-coupled isolation sample circuit, PWM controller and control circuit.On the one hand, forceful electric power can be converted into light current by Hall sensor, to facilitate the sampling of subsequent conditioning circuit.On the other hand, the light current that Hall sensor transmits further is converted into being suitble to the light current of subsequent conditioning circuit control by light-coupled isolation sample circuit, and the characteristic that light-coupled isolation sample circuit has filtering, isolation good, it can be PWM controller output accurately sampled signal, make so as to PWM controller and more precisely judging.Yet another aspect, when input voltage becomes larger or the electric current of load-side becomes larger, for control circuit according to pwm control signal, the pulse duty factor of rapid adjustment control inverter circuit is excessive to achieve the purpose that stabilize the output voltage and limit load current.
Description
Technical field
The utility model is related to inverter technology field more particularly to a kind of photovoltaic DC-to-AC converter and photovoltaic inversion equipment.
Background technology
The converting direct-current power into alternating-current power that photovoltaic DC-to-AC converter can will be transmitted via solar panel, then alternating current is defeated
Toward load, loaded work piece is driven.
Inventor has found that conventional road lamp has the following problems by studying for a long period of time：Occur in input voltage or load-side
When fluctuation, the load current of photovoltaic DC-to-AC converter increases considerably, thus the operation is stable of extreme influence to load-side, because
This, the work of conventional photovoltaic inverter is unreliable, and anti-interference is poor.
Utility model content
In order to overcome above-mentioned technical problem, a purpose of the utility model embodiment to be intended to provide a kind of photovoltaic DC-to-AC converter
And photovoltaic inversion equipment, reliable operation and stabilization.
In a first aspect, the utility model embodiment provides a kind of photovoltaic DC-to-AC converter, including：
Inverter circuit, for external power supply to be reverse into three-phase alternating-current supply；
Hall sensor, the input terminal of the Hall sensor is coupled with the output end of the inverter circuit, for sampling
The three-phase alternating-current supply exports the first sampled voltage；
Light-coupled isolation sample circuit, the output end of the input terminal and the Hall sensor of the light-coupled isolation sample circuit
Connection, for being isolated and sampling first sampled voltage；
PWM controller, the PWM controller are connect with the output end of the light-coupled isolation sample circuit, for according to every
The first sampled voltage from after generates pwm control signal；
Control circuit, the control circuit are connect with the inverter circuit and the PWM controller respectively, for according to institute
Pwm control signal is stated, the inverter circuit is controlled.
Optionally, the inverter circuit includes：
Photoelectrical coupler is exported for the external power supply to be isolated；
Signal conditioning circuit is connect with the photoelectrical coupler, outer after the photoelectric coupler isolation for improving
Portion's power supply；
IGBT inverter bridges are connect with the signal conditioning circuit and the control circuit, in the control circuit
Control under, the external power supply after conditioning is reverse into three-phase alternating-current supply.
Optionally, the signal conditioning circuit includes：
Filter circuit, the input terminal of the filter circuit are connect with the photoelectrical coupler, the output of the filter circuit
End is connect with the IGBT inverter bridges, and the filter circuit is for filtering out the external electrical after the photoelectric coupler isolation
Harmonic wave in source；
Clamp circuit, the input terminal of the clamp circuit are connect with the input terminal of the filter circuit, the clamp circuit
Output end connect with the output end of the filter circuit, the clamp circuit is used to for IGBT inverter bridges provide fixed current potential.
Optionally, the clamp circuit includes zener diode.
Optionally, the photovoltaic DC-to-AC converter further includes wireless communication module, the wireless communication module and control electricity
Road connects, and is used for and background communication.
Optionally, the photovoltaic DC-to-AC converter further includes voltage sampling circuit, the input terminal of the voltage sampling circuit and institute
The output end connection of inverter circuit is stated, the output end of the voltage sampling circuit is connect with the control circuit.
Optionally, the photovoltaic DC-to-AC converter further includes current sampling circuit, the input terminal of the current sampling circuit and institute
The output end connection of inverter circuit is stated, the output end of the current sampling circuit is connect with the control circuit.
Optionally, the photovoltaic DC-to-AC converter further includes voltage conversion circuit, the input terminal of the voltage conversion circuit and institute
State the output end connection of inverter circuit, the output end of the voltage conversion circuit respectively with the PWM controller and the control
Circuit connects.
Optionally, the photovoltaic DC-to-AC converter further includes temperature sensing circuit, the temperature sensing circuit and control electricity
Road connects, the operating temperature for sampling the photovoltaic DC-to-AC converter.
In second aspect, the utility model embodiment provides a kind of photovoltaic inversion equipment, including：
Shell；And
Any one of them photovoltaic DC-to-AC converter, the photovoltaic DC-to-AC converter are contained in the shell.
In the utility model embodiment, inverter circuit is used to external power supply being reverse into three-phase alternating-current supply.Hall passes
Sensor is coupled with the output end of inverter circuit, is used for sampling three-phase AC power, exports the first sampled voltage.Light-coupled isolation samples
The output end of circuit and Hall sensor connects, for being isolated and sampling the first sampled voltage.PWM controller is adopted with light-coupled isolation
The output end of sample circuit connects, for according to the first sampled voltage after isolation, generating pwm control signal.Control circuit is distinguished
It is connect with inverter circuit and PWM controller, for according to pwm control signal, controlling inverter circuit.Therefore, on the one hand, Hall passes
Forceful electric power can be converted into light current by sensor, to facilitate the sampling of subsequent conditioning circuit.On the other hand, light-coupled isolation sample circuit is again into one
The light current that Hall sensor transmits is converted into being suitble to the light current of subsequent conditioning circuit control by step, and light-coupled isolation sample circuit has filter
The good characteristic of wave, isolation can be PWM controller output accurately sampled signal, so that PWM controller is made subject to more
Really judge.Yet another aspect, when input voltage becomes larger or the electric current of load-side becomes larger, control circuit is controlled according to PWM
Signal, the pulse duty factor of rapid adjustment control inverter circuit stabilize the output voltage and to limit load current excessive to reach
Purpose.
Description of the drawings
Fig. 1 is that the utility model embodiment provides a kind of schematic block circuit diagram of photovoltaic DC-to-AC converter；
Fig. 2 is that the utility model embodiment provides a kind of schematic block circuit diagram of inverter circuit；
Fig. 3 is that the utility model embodiment provides a kind of schematic block circuit diagram of signal conditioning circuit；
Fig. 4 is that another embodiment of the utility model provides a kind of schematic block circuit diagram of photovoltaic DC-to-AC converter.
Specific implementation mode
For the ease of understanding the utility model, with reference to the accompanying drawings and detailed description, the utility model is carried out more
Detailed description.It should be noted that when element is expressed " being fixed on " another element, it can be directly in another element
Upper or placed in the middle there may be one or more therebetween elements.When an element is expressed " connection " another element, it can
To be directly to another element or may exist one or more elements placed in the middle therebetween.This specification is used
Term " vertical ", " horizontal ", "left", "right" and similar statement for illustrative purposes only.
Unless otherwise defined, technical and scientific term all used in this specification and the skill for belonging to the utility model
The normally understood meaning of technical staff in art field is identical.Art used in the description of the utility model in this specification
Language is intended merely to the purpose of description specific embodiment, is not intended to limitation the utility model.Art used in this specification
Language "and/or" includes any and all combinations of one or more relevant Listed Items.
For convenience of explanation and understand the technical solution of the utility model embodiment, illustrate below used in the noun of locality
The orientation that attached drawing of being subject to is shown.
A kind of schematic block circuit diagram of photovoltaic DC-to-AC converter is provided referring to Fig. 1, Fig. 1 is the utility model embodiment.Such as Fig. 1
Shown, photovoltaic DC-to-AC converter 100 includes：Inverter circuit 11, Hall sensor 12, light-coupled isolation sample circuit 13, PWM controller 14
And control circuit 15.
Inverter circuit 11 is used to external power supply being reverse into three-phase alternating-current supply.
The input terminal of Hall sensor 12 is coupled with the output end of inverter circuit 11, and Hall sensor 12 is used for sampling three-phase
AC power exports the first sampled voltage.
The input terminal of light-coupled isolation sample circuit 13 is connect with the output end of Hall sensor 12, light-coupled isolation sample circuit
13 for being isolated and sampling the first sampled voltage.
PWM controller 14 is connect with the output end of light-coupled isolation sample circuit 13, after PWM controller 14 is used for according to isolation
The first sampled voltage, generate pwm control signal.
Control circuit 15 is connect with inverter circuit 11 and PWM controller 14 respectively, and control circuit 15 according to PWM for controlling
Signal controls inverter circuit 11.
On the one hand, forceful electric power can be converted into light current by Hall sensor 12, to facilitate the sampling of subsequent conditioning circuit.Another party
The light current that Hall sensor 12 transmits further is converted into being suitble to subsequent conditioning circuit control by face, light-coupled isolation sample circuit 13
Light current, and the characteristic that light-coupled isolation sample circuit 13 has filtering, isolation good can be that PWM controller 14 exports accurately
Ground sampled signal is made so as to PWM controller 14 and more precisely being judged.Yet another aspect, when input voltage becomes larger or bears
When the electric current of load side becomes larger, control circuit 15 is according to pwm control signal, the pulse duration of rapid adjustment control inverter circuit 11
Than excessive to achieve the purpose that stabilize the output voltage and limit load current.
In some embodiments, referring to Fig. 2, inverter circuit 11 includes：Photoelectrical coupler 111, signal conditioning circuit 112
And IGBT inverter bridges 113.
Photoelectrical coupler 111 is used to external power supply being isolated and export.
Signal conditioning circuit 112 is connect with photoelectrical coupler 111, and signal conditioning circuit 112 is for improving photoelectrical coupler
External power supply after 111 isolation.
IGBT inverter bridges 113 are connect with signal conditioning circuit 112 and control circuit 15, for the control in control circuit 15
Under, the external power supply after conditioning is reverse into three-phase alternating-current supply.
Since signal conditioning circuit 112 can improve the external power supply after isolation, and exports satisfaction and it is expected waveform
Power supply therefore, can export reliable and meet desired three-phase alternating current then by the reversion reaction of IGBT inverter bridges 113
Power supply.
In some embodiments, referring to Fig. 3, signal conditioning circuit 112 includes：Filter circuit 1121 and clamp circuit
1122。
The input terminal of filter circuit 1121 is connect with photoelectrical coupler 111, and the output end and IGBT of filter circuit 1121 are inverse
Become bridge 113 to connect, filter circuit 1121 is used to filter out the harmonic wave in the external power supply after the isolation of photoelectrical coupler 111.
The input terminal of clamp circuit 1122 is connect with the input terminal of filter circuit 1121, the output end of clamp circuit 1122 with
The output end of filter circuit 1121 connects, and clamp circuit 1122 is used to provide fixed current potential for IGBT inverter bridges 113 so that even if
Input voltage fluctuates widely, and clamp circuit 1122 also can be that IGBT inverter bridges 113 provide fixed current potential, IGBT inverter bridges
113 can more reliably work.
In some embodiments, clamp circuit 1122 includes zener diode.
In some embodiments, referring to Fig. 4, photovoltaic DC-to-AC converter 100 further includes wireless communication module 16, radio communication mold
Block 16 is connect with control circuit 15, is used for and background communication.
The electrical parameter of photovoltaic DC-to-AC converter 100 can be uploaded to backstage by wireless communication module 16, so as to background monitoring light
Lie prostrate the working condition of inverter 100.
Referring again to Fig. 4, photovoltaic DC-to-AC converter 100 further includes voltage sampling circuit 17, the input terminal of voltage sampling circuit 17
It is connect with the output end of inverter circuit 11, the output end of voltage sampling circuit 17 is connect with control circuit 15.
17 sampling three-phase AC power of voltage sampling circuit exports the second sampled voltage, and transmission control circuit 15.One side
Face, control circuit 15 can module 16 be uploaded to backstage by radio communication by the second sampled voltage.On the other hand, control circuit
15 judge whether the second sampled voltage meets predetermined voltage threshold, if not meeting, directly control inverter circuit 11 and are stopped.If
Meet, control circuit 15 maintains 11 current working status of inverter circuit.
Referring again to Fig. 4, photovoltaic DC-to-AC converter 100 further includes current sampling circuit 18, the input terminal of current sampling circuit 18
It is connect with the output end of inverter circuit 11, the output end of current sampling circuit 18 is connect with control circuit 15.
18 sampling three-phase AC power of current sampling circuit exports sample rate current, and transmission control circuit 15.On the one hand,
Control circuit 15 can module 16 be uploaded to backstage by radio communication by sample rate current.On the other hand, control circuit 15 judges
Whether sample rate current meets predetermined current threshold, if not meeting, directly controls inverter circuit 11 and is stopped.If satisfied, control
Circuit 15 maintains 11 current working status of inverter circuit.
Referring again to Fig. 4, photovoltaic DC-to-AC converter 100 further includes voltage conversion circuit 19, the input terminal of voltage conversion circuit 19
Connect with the output end of inverter circuit 11, the output end of voltage conversion circuit 19 respectively with PWM controller 14 and control circuit 15
Connection.
Voltage conversion circuit 19 can will be converted into direct current by three phase mains all the way, and be PWM controller 14 and control electricity
Road 15 provides power supply.
Referring again to Fig. 4, photovoltaic DC-to-AC converter 100 further includes temperature sensing circuit 20, temperature sensing circuit 20 and control electricity
Road 15 connects, and temperature sensing circuit 20 is used to sample the operating temperature of photovoltaic DC-to-AC converter 100, and control circuit 15 is according to photovoltaic inversion
The operating temperature of device 100 controls inverter circuit 11 so that photovoltaic DC-to-AC converter 100 works relatively reliable.
In above-mentioned each embodiment, control circuit 15 can be general processor, digital signal processor (DSP), specially
It can with integrated circuit (ASIC), field programmable gate array (FPGA), microcontroller, ARM (AcornRISC Machine) or other
Any combinations of programmed logic device, discrete gate or transistor logic, discrete hardware component or these components.
On the other hand as the utility model, the utility model embodiment provides a kind of photovoltaic inversion equipment.Photovoltaic inversion
Equipment includes：Shell and photovoltaic DC-to-AC converter, photovoltaic DC-to-AC converter are contained in shell.Wherein, photovoltaic DC-to-AC converter herein is upper
State the photovoltaic DC-to-AC converter that each embodiment is illustrated.
Therefore, on the one hand, forceful electric power can be converted into light current by Hall sensor, to facilitate the sampling of subsequent conditioning circuit.It is another
The light current that Hall sensor transmits further is converted into being suitble to the weak of subsequent conditioning circuit control by aspect, light-coupled isolation sample circuit
Electricity, and the characteristic that light-coupled isolation sample circuit has filtering, isolation good can be that PWM controller output accurately samples
Signal is made so as to PWM controller and more precisely being judged.Yet another aspect, when input voltage becomes larger or the electricity of load-side
When rheology is big, for control circuit according to pwm control signal, the pulse duty factor of rapid adjustment control inverter circuit is steady to reach
Determine output voltage and limits the excessive purpose of load current.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
All any modification, equivalent and improvement etc., should be included in the utility model made by within the spirit and principle of utility model
Protection domain within.
Claims (10)
1. a kind of photovoltaic DC-to-AC converter, which is characterized in that including：
Inverter circuit, for external power supply to be reverse into three-phase alternating-current supply；
Hall sensor, the input terminal of the Hall sensor are coupled with the output end of the inverter circuit, described for sampling
Three-phase alternating-current supply exports the first sampled voltage；
Light-coupled isolation sample circuit, the input terminal of the light-coupled isolation sample circuit connect with the output end of the Hall sensor
It connects, for being isolated and sampling first sampled voltage；
PWM controller, the PWM controller are connect with the output end of the light-coupled isolation sample circuit, after according to isolation
The first sampled voltage, generate pwm control signal；
Control circuit, the control circuit are connect with the inverter circuit and the PWM controller respectively, for according to
Pwm control signal controls the inverter circuit.
2. photovoltaic DC-to-AC converter according to claim 1, which is characterized in that the inverter circuit includes：
Photoelectrical coupler is exported for the external power supply to be isolated；
Signal conditioning circuit is connect with the photoelectrical coupler, for improving the external electrical after the photoelectric coupler isolation
Source；
IGBT inverter bridges are connect with the signal conditioning circuit and the control circuit, for the control in the control circuit
Under system, the external power supply after conditioning is reverse into three-phase alternating-current supply.
3. photovoltaic DC-to-AC converter according to claim 2, which is characterized in that the signal conditioning circuit includes：
Filter circuit, the input terminal of the filter circuit are connect with the photoelectrical coupler, the output end of the filter circuit with
The IGBT inverter bridges connection, the filter circuit is for filtering out in the external power supply after the photoelectric coupler isolation
Harmonic wave；
Clamp circuit, the input terminal of the clamp circuit are connect with the input terminal of the filter circuit, the clamp circuit it is defeated
Outlet is connect with the output end of the filter circuit, and the clamp circuit is used to provide fixed current potential for IGBT inverter bridges.
4. photovoltaic DC-to-AC converter according to claim 3, which is characterized in that the clamp circuit includes zener diode.
5. photovoltaic DC-to-AC converter according to any one of claims 1 to 4, which is characterized in that the photovoltaic DC-to-AC converter further includes
Wireless communication module, the wireless communication module are connect with the control circuit, are used for and background communication.
6. photovoltaic DC-to-AC converter according to any one of claims 1 to 4, which is characterized in that the photovoltaic DC-to-AC converter further includes
Voltage sampling circuit, the input terminal of the voltage sampling circuit are connect with the output end of the inverter circuit, the voltage sample
The output end of circuit is connect with the control circuit.
7. photovoltaic DC-to-AC converter according to any one of claims 1 to 4, which is characterized in that the photovoltaic DC-to-AC converter further includes
Current sampling circuit, the input terminal of the current sampling circuit are connect with the output end of the inverter circuit, the current sample
The output end of circuit is connect with the control circuit.
8. photovoltaic DC-to-AC converter according to any one of claims 1 to 4, which is characterized in that the photovoltaic DC-to-AC converter further includes
Voltage conversion circuit, the input terminal of the voltage conversion circuit are connect with the output end of the inverter circuit, the voltage conversion
The output end of circuit is connect with the PWM controller and the control circuit respectively.
9. photovoltaic DC-to-AC converter according to any one of claims 1 to 4, which is characterized in that the photovoltaic DC-to-AC converter further includes
Temperature sensing circuit, the temperature sensing circuit are connect with the control circuit, the work for sampling the photovoltaic DC-to-AC converter
Temperature.
10. a kind of photovoltaic inversion equipment, which is characterized in that including：
Shell；And
Photovoltaic DC-to-AC converter as described in any one of claim 1 to 9, the photovoltaic DC-to-AC converter are contained in the shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820469199.6U CN208046476U (en) | 2018-04-04 | 2018-04-04 | A kind of photovoltaic DC-to-AC converter and photovoltaic inversion equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820469199.6U CN208046476U (en) | 2018-04-04 | 2018-04-04 | A kind of photovoltaic DC-to-AC converter and photovoltaic inversion equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208046476U true CN208046476U (en) | 2018-11-02 |
Family
ID=63947050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820469199.6U Expired - Fee Related CN208046476U (en) | 2018-04-04 | 2018-04-04 | A kind of photovoltaic DC-to-AC converter and photovoltaic inversion equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208046476U (en) |
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2018
- 2018-04-04 CN CN201820469199.6U patent/CN208046476U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
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Granted publication date: 20181102 |