CN108258889A - Auxiliary power supply of photovoltaic inverter system - Google Patents
Auxiliary power supply of photovoltaic inverter system Download PDFInfo
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- CN108258889A CN108258889A CN201810204908.2A CN201810204908A CN108258889A CN 108258889 A CN108258889 A CN 108258889A CN 201810204908 A CN201810204908 A CN 201810204908A CN 108258889 A CN108258889 A CN 108258889A
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- 238000004353 relayed correlation spectroscopy Methods 0.000 claims abstract description 41
- 230000005669 field effect Effects 0.000 claims description 30
- 230000005611 electricity Effects 0.000 claims description 14
- 239000003381 stabilizer Substances 0.000 claims description 14
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
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- 206010044565 Tremor Diseases 0.000 description 1
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Classifications
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- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/10—Arrangements incorporating converting means for enabling loads to be operated at will from different kinds of power supplies, e.g. from ac or dc
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- H02J3/383—
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
-
- 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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
-
- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
-
- 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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- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Inverter Devices (AREA)
Abstract
The present invention relates to a kind of auxiliary power supply of photovoltaic inverter systems, include the auxiliary power module of control module, the rectification module of the connection control module and the connection rectification module；The control module includes relay RELAY and connects the startup voltage comparison unit and timing unit of the relay RELAY respectively；The rectification module includes rectifier bridge；The ac input end of the rectifier bridge reconnects power grid after being connect respectively with the switch K1 of the relay RELAY；The DC output end of the rectifier bridge connects the auxiliary power module.Above-mentioned auxiliary power supply of photovoltaic inverter system, pass through the cooperation for starting voltage comparison unit and timing unit in control module, control relay RELAY on or off, and then control the connection or cut-out of power grid and auxiliary power module, auxiliary power module repeatedly starting and stopping can be avoided, reduces stand-by power consumption of the auxiliary power module at night.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation, more particularly to a kind of auxiliary power supply of photovoltaic inverter system.
Background technology
The common way to take power of accessory power supply of photovoltaic DC-to-AC converter be divided into from power grid take electricity, it is straight from power grid and photovoltaic DC-to-AC converter
Mutually top takes electricity, takes three kinds of electricity from photovoltaic DC-to-AC converter dc bus stream busbar.Wherein, when taking electricity by first two way to take power,
Photovoltaic DC-to-AC converter has idling consumption at night, and needs rectifier bridge and larger input capacitance.
And from photovoltaic DC-to-AC converter dc bus take electricity when, rise in the sun, the dim lights such as sunset and wet weather, photovoltaic
The output-power fluctuation of electrification component is big, can not meet system power demand constantly, lead to repeatedly starting and stopping auxiliary power supply, can be to auxiliary
Power supply and photovoltaic DC-to-AC converter is helped to cause larger injury.
Invention content
Based on this, the present invention provides a kind of auxiliary power supply of photovoltaic inverter system, and power consumption is smaller, and accessory power supply can be avoided anti-
Multiple start and stop.
In order to achieve the object of the present invention, the present invention adopts the following technical scheme that：
A kind of auxiliary power supply of photovoltaic inverter system, which is characterized in that including control module, connect the control module
The auxiliary power module of rectification module and the connection rectification module；The control module includes relay RELAY and difference
Connect the startup voltage comparison unit and timing unit of the relay RELAY；The rectification module includes rectifier bridge；It is described whole
The ac input end of stream bridge reconnects power grid after being connect respectively with the switch K1 of the relay RELAY；The rectifier bridge it is straight
It flows output terminal and connects the auxiliary power module；The control module is used to reduce in the output power of photovoltaic DC-to-AC converter and shakiness
Periodically, the auxiliary power module is controlled to obtain power supply from power grid.
Above-mentioned auxiliary power supply of photovoltaic inverter system passes through the startup voltage comparison unit and timing unit in control module
Cooperation, control relay RELAY on or off, and then control the connection or cut-out of power grid and auxiliary power module, can
Auxiliary power module repeatedly starting and stopping is avoided, reduces stand-by power consumption of the auxiliary power module at night.
The auxiliary power supply of photovoltaic inverter system further includes startup voltage module in one of the embodiments, described
Start voltage module and be equipped with input terminal V_pv, for connecting photovoltaic electrification component；The startup voltage module connects the rectification
Module, the startup voltage module are also connected with the auxiliary power module.
The startup voltage module includes resistance R1, R2 and R3, voltage-stabiliser tube ZD1 and capacitance in one of the embodiments,
C1；One end of the resistance R1 connects the input terminal V_pv, and described resistance R1, R2 and R3 are grounded after being sequentially connected in series；It is described steady
Pressure pipe ZD1 is in parallel with the resistance R3；The anode of the capacitance C1 connects the cathode of the voltage-stabiliser tube ZD1, the capacitance C1's
Cathode is grounded.
The control module further includes triode Q1 and resistance R4, R5 and R6 in one of the embodiments,；It is described after
The input terminal of the coil of electric appliance RELAY connects the anode of the capacitance C1, the output terminal connection of the coil of the relay RELAY
The collector of the triode Q1, the base stage of the triode Q1 connect that connect the startup voltage after the resistance R4 more single
The output terminal of member；The base stage of the triode Q1 is also connected with connecting after the resistance R5 output terminal of the timing unit；It is described
The emitter ground connection of triode Q1；The output terminal for starting voltage comparison unit connects the timing after connecting the resistance R6
Unit.
The startup voltage comparison unit includes resistance R8, R9 and R10 and operation amplifier in one of the embodiments,
Device；One end of the resistance R8 connects the input terminal V_pv, and described resistance R8, R9 and R10 are grounded after being sequentially connected in series；The fortune
The normal phase input end for calculating amplifier is connected between the resistance R9 and resistance R10；The inverting input of the operational amplifier
It is grounded after one voltage-stabiliser tube ZD2 of connection, the inverting input of the operational amplifier is also connected with a resistance R11, the resistance
R11 the other end connection there are one+12V supply voltages；The output terminal of the operational amplifier and the operational amplifier are just
Resistance R12 is also associated between phase input terminal, so that the operational amplifier becomes a hysteresis comparator.
The timing unit includes resistance R in one of the embodiments,A、RBWith R13, field-effect tube Q2, capacitance CT with
C3 and timer U1；The resistance RA、RBIt is sequentially connected in series with R13；The resistance RAOpposite end be connected to it is described fixed
When device U1 4 feet and 7 feet；The resistance RBOpposite end be connected to 7 feet and 6 feet of the timer U1；The electricity
The one end for hindering R13 connects the resistance RB, the drain electrode of the other end connection field-effect tube Q2；The grid of the field-effect tube Q2
Connect the resistance R6, the source electrode ground connection of the field-effect tube Q2.
4 feet of the timer U1 and 8 feet are all connected with the reference voltage V CC in one of the embodiments, described fixed
When device U1 2 feet the anode of the capacitance CT, the cathode ground connection of the capacitance CT are connect with 6 feet；5 feet of the timer U1 connect
Connect the anode of the capacitance C3, the cathode ground connection of the capacitance C3；The 1 foot ground connection of the timer U1, the 3 of the timer U1
Foot connects the resistance R5, to export timing signal.
The auxiliary power module includes transformer TX1, field-effect tube Q3, power supply chip in one of the embodiments,
U2, capacitance C4 and load RL；One end of the primary coil of the transformer TX1 connects the rectifier bridge BD, the transformer TX1
The one end of primary coil be also connected with the input terminal V_pv；The other end connection institute of the primary coil of the transformer TX1
State the drain electrode of field-effect tube Q3, the source electrode ground connection of field-effect tube Q3, the grid connection power supply chip U2 of field-effect tube Q3；The change
The opposite end of the secondary coil of depressor TX1 is connected to the load RLOpposite end；The capacitance C4 is born with described
Carry RLParallel connection, the anode of the capacitance C4 are also connected with the cathode ground connection of reference voltage V CC, the capacitance C4；The power supply chip
The secondary coil of the U2 connections transformer TX1.
It is also connected between the primary coil of the transformer TX1 and the input terminal V_pv in one of the embodiments,
There is diode D3；The secondary coil of the transformer TX1 and the load RLBetween be also associated with diode D4.
The input terminal of the coil of the relay RELAY is also associated with diode D1 in one of the embodiments,；It is described
The cathode of diode D1 connects the input terminal of the coil of the relay RELAY, and the anode of the diode D1 connects the base
Quasi- voltage VCC.
Description of the drawings
Fig. 1 is the module frame chart of the auxiliary power supply of photovoltaic inverter system of a better embodiment of the invention；
Fig. 2 is the circuit diagram of auxiliary power supply of photovoltaic inverter system shown in FIG. 1；
Fig. 3 is the circuit diagram shown in Fig. 2 for starting voltage comparison unit；
Fig. 4 is the circuit diagram of timing unit shown in Fig. 2；
Fig. 5 is the inside simplified principle block diagram of the timer U1 in timing unit shown in Fig. 4.
Attached drawing marks explanation：
10- starts voltage module, 20- control modules, and 21- starts voltage comparison unit, 22- timing units, and 23- operations are put
Big device, 30- rectification modules, 40- auxiliary power modules.
Specific embodiment
For the ease of understanding the present invention, the present invention is described more fully below with reference to relevant drawings.In attached drawing
Give presently preferred embodiments of the present invention.But the present invention can realize in many different forms, however it is not limited to this paper institutes
The embodiment of description.On the contrary, the purpose for providing these embodiments is to make the understanding to the disclosure more thorough
Comprehensively.
It should be noted that when element is referred to as " being fixed on " another element, it can be directly on another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or it may be simultaneously present centering elements.
Unless otherwise defined, all of technologies and scientific terms used here by the article is with belonging to technical field of the invention
The normally understood meaning of technical staff is identical.Term used in the description of the invention herein is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.
It please refers to Fig.1 to Fig. 5, is the auxiliary power supply of photovoltaic inverter system of a better embodiment of the invention, including opening
Dynamic voltage module 10, connection start the control module 20 of voltage module 10, the rectification module 30 of link control module 20 and difference
Connection starts the auxiliary power module 40 of voltage module 10 and rectification module 30.
The startup voltage module 10 includes resistance R1, R2 and R3, voltage-stabiliser tube ZD1 and capacitance C1.Start voltage module 10
Equipped with input terminal V_pv, input terminal V_pv receives the voltage that photovoltaic electrification component provides for connecting photovoltaic electrification component.Resistance
One end connection input terminal V_pv of R1, resistance R1, R2 and R3 are grounded after being sequentially connected in series.Voltage-stabiliser tube ZD1 is in parallel with resistance R3, specifically
Ground, the cathode of voltage-stabiliser tube ZD1 are connected between resistance R2 and resistance R3, the plus earth of voltage-stabiliser tube ZD1.Capacitance C1 and voltage-stabiliser tube
ZD1 is in parallel, specifically, the cathode of the anode connection voltage-stabiliser tube ZD1 of capacitance C1, the cathode ground connection of capacitance C1.Further, at this
In embodiment, the anode of capacitance C1 is also connected with+12V a supply voltage.
The control module 20 includes relay RELAY, triode Q1, resistance R4, R5 and R6, starts voltage comparison unit
21 and timing unit 22.The anode of the input terminal connection capacitance C1 of the coil of relay RELAY, the coil of relay RELAY
The collector of output terminal connecting triode Q1, after the base stage connection resistance R4 of triode Q1 connection start voltage comparison unit 21
Output terminal, the base stage of triode Q1 are also connected with the output terminal of connection timing unit 22 after resistance R5；The emitter of triode Q1 connects
Ground.In the present embodiment, start voltage comparison unit 21 and be also connected with timing unit 22, specifically, start voltage comparison unit 21
Output terminal connection resistance R6 after access timing unit 22.
Further, in order to ensure the control stability of relay RELAY, the input terminal of the coil of relay RELAY is also
It is connected with diode D1, the input terminal of the coil of the cathode connection relay RELAY of diode D1, the anode connection of diode D1
Reference voltage V CC.
Further, in order to strengthen the stability of filter effect and voltage, between the base stage and emitter of triode Q1 also
It is connected in parallel with a capacitor C2 and resistance R7 respectively.
As shown in figure 3, starting voltage comparison unit 21 includes resistance R8, R9 and R10 and operational amplifier 23.Resistance R8
One end connection input terminal V_pv, resistance R8, R9 and R10 are grounded after being sequentially connected in series.The normal phase input end of operational amplifier 23 connects
It is connected between resistance R9 and resistance R10.The inverting input of operational amplifier 23 is grounded after connecting a voltage-stabiliser tube ZD2.At this
In embodiment, the inverting input of operational amplifier 23 is also connected with a resistance R11, and the other end connection+12V of resistance R11 is supplied
Piezoelectric voltage.The output terminal connection resistance R4 of operational amplifier 23, the output terminal of operational amplifier 23 are also connected with resistance R6, and operation is put
The output level of big device 23 enters timing unit 22 after resistance R6, and timing unit 22 is made to work.
Further, it is also associated with resistance R12 between the output terminal and normal phase input end of operational amplifier 23 so that operation
Amplifier 23 becomes a hysteresis comparator, can efficiently reduce when the voltage that photovoltaic electrification component exports is in critical point and cause
The phenomenon that system repeatedly is restarted.
Further, in the present embodiment, connection benchmark electricity after the positive feeder ear connection diode D2 of operational amplifier 23
Press VCC, the negative feeder ear ground connection of operational amplifier 23.In order to ensure that the running of operational amplifier 23 is steady, operational amplifier 23
Positive feeder ear be also connected with+12V supply voltages.
As shown in figure 4, the fundamental diagram of timing unit 22.Timing unit 22 includes resistance RA、RBWith R13, field-effect tube
Q2, capacitance CT and C3 and timer U1.In the present embodiment, timer U1 is 555 timers.Resistance RA、RBIt is gone here and there successively with R13
Connection.Resistance RAOpposite end be connected to 4 feet and 7 feet of timer U1；Resistance RBOpposite end be connected to timing
7 feet and 6 feet of device U1；One end connection resistance R of resistance R13B, the drain electrode of other end connection field-effect tube Q2.Field-effect tube Q2
Grid connection resistance R6, and receive the output level of operational amplifier 23, the source electrode ground connection of field-effect tube Q2.
In the present embodiment, 4 feet of timer U1 and 8 feet are all connected with reference voltage V CC, and 2 feet connect capacitance CT's with 6 feet
Anode, the cathode ground connection of capacitance CT.The anode of the 5 feet connection capacitance C3 of timer U1, the cathode ground connection of capacitance C3.Timer U1
1 foot ground connection, timer U1 3 feet connection resistance R5, export timing signal.
Further, in the present embodiment, a resistance R14 is also associated between the grid of field-effect tube Q2 and drain electrode, it can
Field-effect tube Q2 is protected not by electrostatic breakdown.
The rectification module 30 includes rectifier bridge BD.Two ac input ends of rectifier bridge BD are respectively with relay RELAY's
After switching K1 connections, power grid is reconnected.Rectifier bridge BD is equipped with direct-flow positive pole and direct current cathode, and the direct-flow positive pole of rectifier bridge BD connects
Auxiliary power module 40, the direct current cathode ground connection of rectifier bridge BD.
The auxiliary power module 40 includes transformer TX1, field-effect tube Q3, power supply chip U2, capacitance C4 and load RL。
The direct-flow positive pole of one end connection rectifier bridge BD of the primary coil of transformer TX1, to obtain the power supply of power grid.Transformer TX1's
The one end of primary coil is also connected with input terminal V_pv, specifically, the one end and the input terminal V_ of the primary coil of transformer TX1
Diode D3 is connected between pv.The drain electrode of the other end connection field-effect tube Q3 of the primary coil of transformer TX1, field-effect tube Q3
Source electrode ground connection, the grid connection power supply chip U2 of field-effect tube Q3.The opposite end of the secondary coil of transformer TX1 connects respectively
It is connected to load RLOpposite end, be also associated with diode D4 between the secondary coil of transformer TX1 and load RL.Load RLAlso
The anode of shunt capacitance C4, capacitance C4 are also connected with reference voltage V CC, the cathode ground connection of capacitance C4.Power supply chip U2 is also connected with becoming
The secondary coil of depressor TX1, power supply chip U2 also have other end ground connection.In the present embodiment, power supply chip U2 starts for the first time
Voltage come from photovoltaic electrification component offer voltage.
In order to ensure that the primary coil of transformer TX1 obtains stable power input, auxiliary power module 40 further includes electricity
Hinder R15, R16, R17 and capacitance C5, C6.One end of the primary coil of one end connection transformer TX1 of resistance R15, resistance R15 with
Resistance R16, resistance R17 are sequentially connected in series, and resistance R17 is also grounded.The primary coil of the anode connection transformer TX1 of capacitance C5, electricity
Hold the cathode ground connection of C5.The anode of capacitance C6 is connected between resistance R16 and resistance R17, the cathode ground connection of capacitance C6.Capacitance C6
Anode be also connected with reference voltage V CC.
Operation principle：
When power supply chip U2 starts for the first time, power supply chip U2 receives the voltage that photovoltaic electrification component provides, when the electricity of acquisition
When pressure reaches the startup voltage of power supply chip U2, power supply chip U2 sends out pwm signal, and driving auxiliary power module 40 works, base
The voltage that quasi- voltage VCC is provided gives power supply chip U2, on the one hand the voltage of reference voltage V CC ensures that auxiliary power module 40 is stablized
On the other hand work is supplied in the duty cycle adjustment that power supply chip U2 does pwm signal as feedback voltage.
When the voltage value of reference voltage V CC supply power supply chips U2 is less than the preset value of reference voltage V CC, power supply chip
The pwm signal output high level of U2, driving FET Q3 conductings, at this point, the voltage on the primary coil of transformer TX1 is upper
It is just lower negative, transformer TX1 storage energy.Since the primary coil of transformer TX1 and the Same Name of Ends of secondary coil are on the contrary, secondary wire
Induced voltage on circle for it is upper it is negative under just, at this point, diode D4 reverse bias, loads RLEnergy provided by capacitance C4.
When the voltage value of reference voltage V CC supply power supply chips U2 is equal to or more than the preset value of reference voltage V CC, electricity
The pwm signal output low level of source chip U2, driving FET Q3 shutdowns, at this point, encouraging on the primary coil of transformer TX1
Magnetoelectricity stream keeps original direction, and exciting current causes voltage positive under being born in sensing generation on the primary coil of transformer TX1,
At this point, it is upper just lower negative that the secondary coil of transformer TX1, which corresponds to the voltage that sensing generates, so that diode D4 becomes positive guide
Logical, the energy of storage is sent to load R by transformer TX1LWith capacitance C4.
Auxiliary power module 40 forms an inverse-excitation type switch power-supply as a result,.
After the auxiliary power supply of photovoltaic inverter system formally starts, if the voltage that photovoltaic electrification component provides is less than rectification
The voltage that module 30 provides, control module 20 connects rectification module 30 by relay RELAY to switch power grid, after rectification
Electric current accesses auxiliary power module 40, input of the electric network source as auxiliary power module 40.Conversely, then by photovoltaic electrification component
Input of the output voltage as auxiliary power module 40.
Start voltage comparison unit 21 jointly to control relay RELAY with timing unit 22, there is following patrol
The relationship of collecting：
| Start the output of voltage comparison unit 21 | The output of timing unit 22 | Relay status |
| 1 | X | Conducting |
| X | 1 | Conducting |
| 0 | 0 | Shutdown |
1：Represent output high level；
0：Represent output low level；
X：Represent 1 or 0.
In the present embodiment, a minimum PV input voltage is set, is denoted as V_pv1, is reached when photovoltaic DC-to-AC converter obtains voltage
To V_pv1, inverter can light screen, into standby mode.In addition, also resetting a minimum PV shutdown voltage, it is denoted as V_
Pv2, when photovoltaic DC-to-AC converter obtains voltage less than V_pv2, then inverter can thorough power-off shutdown.
In the present embodiment, less than the voltage of V_pv1 or V_pv2, auxiliary power module 40 can not be started.
Starting during voltage comparison unit 21 works has a kind of situation：When the voltage that photovoltaic electrification component provides is by liter above freezing
During to the minimum PV input voltages V_pv1 for being more than setting, start voltage comparison unit 21 export high level for be connected after
The switch K1 of electric appliance RELAY, relay RELAY are attracted, and power grid is switched access auxiliary power module 40 powers.As long as relay
RELAY mono- is connected, and the working condition of auxiliary power module 40 will not be influenced by photovoltaic electrification component, i.e., will not be due to photovoltaic generation
Component provide undertension and cause to restart repeatedly.For this process in the practical application of photovoltaic DC-to-AC converter, corresponding is early
The process that the upper sun rises.
Starting also has another situation during voltage comparison unit 21 works：When the voltage that photovoltaic electrification component provides declines
During to minimum PV shutdown voltages V_pv2, start voltage comparison unit 21 and export a low level, timing unit 22 starts fixed at this time
When, after setting time, timing unit 22 exports low level, turns off relay RELAY, i.e. the switch K1 of relay RELAY breaks
It opens, effectively cuts off power supply of the ground power grid to auxiliary power module 40.This process is right in the practical application of photovoltaic DC-to-AC converter
What is answered is the process that the dusk sun falls.
Specifically, as shown in figure 4, when starting the output high level of voltage comparison unit 21, the timing in timing unit 22
Circuit does not work, i.e. resistance RA, RB and capacitance CT do not work, and timing unit 21 exports lasting high level signal so that after
Electric appliance RELAY is held on, and the switch K1 of relay RELAY keeps attracting state, and auxiliary power module 40 connects power grid.When opening
When dynamic voltage comparison unit 21 exports low level, the timing loop work in timing unit 22, i.e. resistance RA、RBAnd capacitance CT is opened
Begin periodically, after setting time, timing unit 22 exports low level signal so that relay RELAY is closed, relay
The switch K1 of RELAY is disconnected, and cuts off the connection between auxiliary power module 40 and power grid.
It is the inside simplified principle block diagram of timer U1 such as Fig. 5.
When the voltage that photovoltaic electrification component provides is more than or equal to minimum PV input voltage V_pv1, start voltage ratio
High level, turn-on relay RELAY are exported compared with unit 21, power grid accesses after 30 rectification of rectification module and starts accessory power supply
Module 40.Since timer U1 is initially powered, the voltage on 2 feet of timer U1 is zero, and lower comparator C2 exports high level so that
Trigger RS set,Low level is exported, then timer U1 exports high level.It is exported at this time due to starting voltage comparison unit 21
High level, therefore field-effect tube Q2 is connected.Resistance R13 only when capacitance CT discharges from metering function, resistance value very little, capacitance CT
On voltage can be clamped down on always by field-effect tube Q2 to 0V, resistance RA、RBAnd capacitance CT does not work.
When the voltage that photovoltaic electrification component provides is less than minimum PV shutdown voltages V_pv2, start voltage comparison unit 21
Low level is exported, at this point, field-effect tube Q2 ends, reference voltage passes through resistance RAWith resistance RBAfter start to be filled to capacitance CT
Electricity.When the voltage value of capacitance CT is more thanWhen, lower comparator C2 exports low level, and trigger RS still keeps original
State.When the voltage value of capacitance CT is more thanWhen, upper comparator C1 exports high level, and trigger RS is reset such that
High level is exported, then timer U1 exports low level.Discharge tube T1 conductings inside timer U1, capacitance CT pass through resistance RBInto
Row electric discharge.At this point, voltage comparison unit 21 and timing unit 22 export low level, therefore, relay RELAY is turned off, i.e.,
The switch K1 of relay RELAY is disconnected, and cut-out power grid supplies the power supply of auxiliary power module 40, ensures in no photovoltaic generating set
In the night of part power supply, the stand-by power consumption of accessory power supply is close to zero.
In the work of timing unit 22, from field-effect tube Q2 cut-off count, until timing unit 22 export it is low level
Timing, can be according to the charge formula of capacitance：Wherein
V0It is here 0V for the initial voltage value on capacitance CT；
VuFor the limit charging voltage value on capacitance CT, here equal to the voltage value of reference voltage V CC；
VtFor the voltage value on t moment capacitance CT, here
R=RA+RB。
Therefore, t=(R can be acquired according to formulaA+RB) Cln3, timing Td=t.Further, in practical application
In, resistance R is set respectivelyAWith resistance RBResistance value, you can required timing Td is set.
Above-mentioned auxiliary power supply of photovoltaic inverter system passes through the startup voltage comparison unit 21 in control module 20 and timing
The cooperation of unit 22 controls relay RELAY on or off, so control power grid and auxiliary power module 40 connection or
Cut-out can avoid 40 repeatedly starting and stopping of auxiliary power module, reduce stand-by power consumption of the auxiliary power module 40 at night.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, it is all considered to be the range of this specification record.
Embodiment described above only expresses the several embodiments of the present invention, and description is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that those of ordinary skill in the art are come
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of auxiliary power supply of photovoltaic inverter system, which is characterized in that including control module, connect the whole of the control module
The auxiliary power module of flow module and the connection rectification module；The control module includes relay RELAY and connects respectively
Connect the startup voltage comparison unit and timing unit of the relay RELAY；The rectification module includes rectifier bridge；The rectification
The ac input end of bridge reconnects power grid after being connect respectively with the switch K1 of the relay RELAY；The direct current of the rectifier bridge
Output terminal connects the auxiliary power module；The control module be used for photovoltaic DC-to-AC converter output power reduce and it is unstable
When, the auxiliary power module is controlled to obtain power supply from power grid.
2. auxiliary power supply of photovoltaic inverter system according to claim 1, which is characterized in that further include startup voltage-mode
Block, the startup voltage module is equipped with input terminal V_pv, for connecting photovoltaic electrification component；The startup voltage module connection institute
Rectification module is stated, the startup voltage module is also connected with the auxiliary power module.
3. auxiliary power supply of photovoltaic inverter system according to claim 2, which is characterized in that the startup voltage module packet
Include resistance R1, R2 and R3, voltage-stabiliser tube ZD1 and capacitance C1；One end of the resistance R1 connects the input terminal V_pv, the resistance
R1, R2 and R3 are grounded after being sequentially connected in series；The voltage-stabiliser tube ZD1 is in parallel with the resistance R3；The anode connection institute of the capacitance C1
State the cathode of voltage-stabiliser tube ZD1, the cathode ground connection of the capacitance C1.
4. auxiliary power supply of photovoltaic inverter system according to claim 3, which is characterized in that the control module further includes
Triode Q1 and resistance R4, R5 and R6；The input terminal of the coil of the relay RELAY connects the anode of the capacitance C1, institute
The output terminal for stating the coil of relay RELAY connects the collector of the triode Q1, the base stage connection institute of the triode Q1
The output terminal for starting voltage comparison unit is connected after stating resistance R4；The base stage of the triode Q1 is also connected with the resistance R5
The output terminal of the timing unit is connected afterwards；The emitter ground connection of the triode Q1；It is described to start the defeated of voltage comparison unit
Outlet connects the timing unit after connecting the resistance R6.
5. auxiliary power supply of photovoltaic inverter system according to claim 4, which is characterized in that the startup voltage is more single
Member includes resistance R8, R9 and R10 and operational amplifier；One end of the resistance R8 connects the input terminal V_pv, the resistance
R8, R9 and R10 are grounded after being sequentially connected in series；The normal phase input end of the operational amplifier is connected to the resistance R9 and resistance R10
Between；The inverting input of the operational amplifier is grounded after connecting a voltage-stabiliser tube ZD2, and the reverse phase of the operational amplifier is defeated
Enter end and be also connected with+12V supply voltages there are one the other end connections of resistance a R11, the resistance R11；The operation amplifier
Resistance R12 is also associated between the normal phase input end of the output terminal of device and the operational amplifier, so that the operational amplifier
As a hysteresis comparator.
6. auxiliary power supply of photovoltaic inverter system according to claim 5, which is characterized in that the timing unit includes electricity
Hinder RA、RBWith R13, field-effect tube Q2, capacitance CT and C3 and timer U1；The resistance RA、RBIt is sequentially connected in series with R13；It is described
Resistance RAOpposite end be connected to 4 feet and 7 feet of the timer U1；The resistance RBOpposite end connect respectively
In 7 feet and 6 feet of the timer U1；One end of the resistance R13 connects the resistance RB, the other end connection field-effect
The drain electrode of pipe Q2；The grid of the field-effect tube Q2 connects the resistance R6, the source electrode ground connection of the field-effect tube Q2.
7. auxiliary power supply of photovoltaic inverter system according to claim 6, which is characterized in that 4 feet of the timer U1
The reference voltage V CC is all connected with 8 feet, 2 feet of the timer U1 connect the anode of the capacitance CT, the electricity with 6 feet
Hold the cathode ground connection of CT；5 feet of the timer U1 connect the anode of the capacitance C3, the cathode ground connection of the capacitance C3；Institute
The 1 foot ground connection of timer U1 is stated, 3 feet of the timer U1 connect the resistance R5, to export timing signal.
8. auxiliary power supply of photovoltaic inverter system according to claim 1, which is characterized in that the auxiliary power module packet
Include transformer TX1, field-effect tube Q3, power supply chip U2, capacitance C4 and load RL；The one of the primary coil of the transformer TX1
End connects the rectifier bridge BD, and the one end of the primary coil of the transformer TX1 is also connected with the input terminal V_pv；The change
The other end of the primary coil of depressor TX1 connects the drain electrode of the field-effect tube Q3, the source electrode ground connection of field-effect tube Q3, field-effect
The grid connection power supply chip U2 of pipe Q3；The opposite end of the secondary coil of the transformer TX1 is connected to the load
RLOpposite end；The capacitance C4 and load RLParallel connection, the anode of the capacitance C4 is also connected with reference voltage V CC, described
The cathode ground connection of capacitance C4；The secondary coil of the power supply chip U2 connections transformer TX1.
9. auxiliary power supply of photovoltaic inverter system according to claim 8, which is characterized in that the transformer TX1's is first
Diode D3 is also associated between grade coil and the input terminal V_pv；The secondary coil of the transformer TX1 and the load
RLBetween be also associated with diode D4.
10. auxiliary power supply of photovoltaic inverter system according to claim 1, which is characterized in that the relay RELAY's
The input terminal of coil is also associated with diode D1；The cathode of the diode D1 connects the defeated of the coil of the relay RELAY
Enter end, the anode of the diode D1 connects the reference voltage V CC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810204908.2A CN108258889A (en) | 2018-03-13 | 2018-03-13 | Auxiliary power supply of photovoltaic inverter system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810204908.2A CN108258889A (en) | 2018-03-13 | 2018-03-13 | Auxiliary power supply of photovoltaic inverter system |
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| Publication Number | Publication Date |
|---|---|
| CN108258889A true CN108258889A (en) | 2018-07-06 |
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ID=62746774
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810204908.2A Pending CN108258889A (en) | 2018-03-13 | 2018-03-13 | Auxiliary power supply of photovoltaic inverter system |
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| Country | Link |
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| CN (1) | CN108258889A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109004675A (en) * | 2018-08-27 | 2018-12-14 | 湖北工业大学 | A kind of wide input accessory power supply of adaptive switching winding |
| CN116526429A (en) * | 2023-07-04 | 2023-08-01 | 深圳市首航新能源股份有限公司 | Inverter and energy storage system |
-
2018
- 2018-03-13 CN CN201810204908.2A patent/CN108258889A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109004675A (en) * | 2018-08-27 | 2018-12-14 | 湖北工业大学 | A kind of wide input accessory power supply of adaptive switching winding |
| CN109004675B (en) * | 2018-08-27 | 2021-12-03 | 湖北工业大学 | Wide input auxiliary power supply of self-adaptation switching winding |
| CN116526429A (en) * | 2023-07-04 | 2023-08-01 | 深圳市首航新能源股份有限公司 | Inverter and energy storage system |
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