CN103780071B - A kind of over-pressure safety device and photovoltaic generating system - Google Patents
A kind of over-pressure safety device and photovoltaic generating system Download PDFInfo
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- CN103780071B CN103780071B CN201410028531.1A CN201410028531A CN103780071B CN 103780071 B CN103780071 B CN 103780071B CN 201410028531 A CN201410028531 A CN 201410028531A CN 103780071 B CN103780071 B CN 103780071B
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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 invention discloses a kind of over-pressure safety device and photovoltaic generating system; described over-pressure safety device is connected between photovoltaic substrate group string and photovoltaic DC-to-AC converter; described over-pressure safety device includes: the first control unit and protected location; wherein; described first control unit is connected with described protected location; during for being more than the maximum input voltage of described photovoltaic DC-to-AC converter when the open-circuit voltage of described photovoltaic substrate group string, control described protected location and open, described photovoltaic DC-to-AC converter is protected.The present invention, in the case of photovoltaic DC-to-AC converter input overvoltage, can avoid result in photovoltaic DC-to-AC converter and damage, and photovoltaic DC-to-AC converter plays the effect of input overvoltage protection.
Description
Technical field
The present invention relates to power protection field, particularly relate to a kind of over-pressure safety device and photovoltaic generation
System.
Background technology
In photovoltaic generating system, photovoltaic substrate group string the DC voltage produced, need to pass through photovoltaic DC-to-AC converter
It is transformed into alternating voltage, the most just can be transmitted or be supplied to user and use.
At present, photovoltaic substrate group string is typically directly connected with photovoltaic DC-to-AC converter.Owing to the photovoltaic of every kind of specification is inverse
The input voltage becoming device has certain scope, and when input voltage exceedes the scope of permission, i.e. to exceed its maximum defeated
When entering voltage, photovoltaic DC-to-AC converter is likely to damaged.Therefore, in the operation instructions of photovoltaic DC-to-AC converter
The open-circuit voltage of photovoltaic substrate group string not can exceed that the maximum input of photovoltaic DC-to-AC converter to have special word to emphasize
Voltage, otherwise, the photovoltaic DC-to-AC converter thereby resulted in damages and is not belonging to warranty coverage.But, if the user while
Operation instructions are the most carefully seen or owing to counting loss causes opening of photovoltaic substrate group string during installation
Road voltage exceedes the maximum input voltage of photovoltaic DC-to-AC converter, then may result in photovoltaic DC-to-AC converter and damage.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of over-pressure safety device and photovoltaic generating system, to solve
Certainly prior art causes its technical problem damaged in the case of photovoltaic DC-to-AC converter input overvoltage.
First aspect, a kind of over-pressure safety device that the embodiment of the present invention provides, described over-pressure safety device is even
Being connected between photovoltaic substrate group string and photovoltaic DC-to-AC converter, described over-pressure safety device includes: the first control unit
And protected location, wherein,
Described first control unit is connected with described protected location, for when the open circuit of described photovoltaic substrate group string
When voltage is more than the maximum input voltage of described photovoltaic DC-to-AC converter, controls described protected location and open, to described
Photovoltaic DC-to-AC converter is protected.
Further, described over-pressure safety device also includes the first alarm unit, described first alarm unit with
Described first control unit connects, and wherein, described first control unit is additionally operable to when described photovoltaic substrate group string
Open-circuit voltage more than the maximum input voltage of described photovoltaic DC-to-AC converter time, control described first alarm unit and enter
Row is reported to the police.
Further, described over-pressure safety device also includes the second control unit, described second control unit with
Described first control unit connects, and wherein, described first control unit is additionally operable to when described photovoltaic substrate group string
Open-circuit voltage more than the maximum input voltage of described photovoltaic DC-to-AC converter time, control described second control unit raw
Become alarm signal, so that described photovoltaic DC-to-AC converter is reported to the police under the control of described alarm signal.
Further, described first control unit includes: the first diode, the second diode and the first electric capacity
Device, wherein, described first diode and the second diode are transient voltage suppressor diode or voltage stabilizing two
Pole is managed；
The negative electrode of described first diode and the positive pole of described photovoltaic substrate group string and described photovoltaic DC-to-AC converter are just
Pole connects, the anode of described first diode and the negative electrode of described second diode, described first capacitor
Positive plate, described protected location connect, the anode of described second diode and bearing of described first capacitor
Pole plate is connected with the described negative pole of photovoltaic substrate group string and the negative pole of described photovoltaic DC-to-AC converter.
Further, described protected location includes: the first resistance, the second resistance and the first NMOS tube；
One end of described first resistance is connected with the anode of the first diode of described first control unit, described
The other end of the first resistance is connected with the grid of one end of described second resistance and described first NMOS tube, described
The drain electrode of the first NMOS tube is connected with the described positive pole of photovoltaic substrate group string and the positive pole of described photovoltaic DC-to-AC converter,
The negative pole of the source electrode of described first NMOS tube and the other end of described second resistance and described photovoltaic substrate group string
Connect with the negative pole of described photovoltaic DC-to-AC converter.
Further, the rated voltage of described first diode is equal to the maximum input electricity of described photovoltaic DC-to-AC converter
Pressure；
The rated voltage of described second diode is more than the cut-in voltage of described first NMOS tube.
Further, described first alarm unit includes: the 3rd resistance and buzzer；
One end of described 3rd resistance is connected with the anode of the first diode of described first control unit, described
The anode with described buzzer of the other end of the 3rd resistance is connected, the negative terminal of described buzzer and described photovoltaic
The negative pole of substrate in batch string and the negative pole of described photovoltaic DC-to-AC converter connect.
Further, described second control unit includes: the 4th resistance and photoelectrical coupler, wherein, described
Photoelectrical coupler includes the first light emitting diode and the first phototriode；
Described 4th resistance one end is connected with the anode of the first diode of described first control unit, and described
The other end of four resistance is connected with the anode of the first light emitting diode of described photoelectrical coupler, described first
The negative electrode of optical diode is connected with the described negative pole of photovoltaic substrate group string and the negative pole of described photovoltaic DC-to-AC converter, institute
State colelctor electrode and the Digital Signal Processing in described photovoltaic DC-to-AC converter of the first phototriode of photoelectrical coupler
Device connects, the grounded emitter of described first phototriode.
Second aspect, the embodiment of the present invention also provides for a kind of photovoltaic generating system, including photovoltaic substrate group string,
Photovoltaic DC-to-AC converter and the over-pressure safety device of above-mentioned first aspect, described over-pressure safety device is connected to described light
Between volt substrate in batch string and described photovoltaic DC-to-AC converter, for being more than when the open-circuit voltage of described photovoltaic substrate group string
During the maximum input voltage of described photovoltaic DC-to-AC converter, described photovoltaic DC-to-AC converter is protected.
The over-pressure safety device of embodiment of the present invention offer and photovoltaic generating system, filled by this overvoltage protection
The first control unit in putting and protected location, control the input voltage of photovoltaic DC-to-AC converter at photovoltaic DC-to-AC converter
Maximum input voltage in the range of, can avoid when the open-circuit voltage of photovoltaic substrate group string is more than photovoltaic DC-to-AC converter
Maximum input voltage time cause photovoltaic DC-to-AC converter to damage, photovoltaic DC-to-AC converter is played input overvoltage protection work
With；Additionally, by the first alarm unit in this over-pressure safety device and the second control unit, when photovoltaic base
Can be sent out when the open-circuit voltage of plate group string is more than the maximum input voltage of photovoltaic DC-to-AC converter alarm for
Remind user to disconnect the input line of photovoltaic DC-to-AC converter as early as possible, and reduce the number of photovoltaic substrate group string, to reduce
The open-circuit voltage of photovoltaic substrate group string.
Accompanying drawing explanation
The detailed description that non-limiting example is made made with reference to the following drawings by reading, the present invention
Other features, objects and advantages will become more apparent upon:
Fig. 1 is that a kind of structure to photovoltaic DC-to-AC converter employing over-pressure safety device that the embodiment of the present invention provides is shown
It is intended to；
Fig. 2 is the structure that the another kind that the embodiment of the present invention provides uses over-pressure safety device to photovoltaic DC-to-AC converter
Schematic diagram；
Fig. 3 is a kind of circuit diagram that photovoltaic DC-to-AC converter uses over-pressure safety device that the embodiment of the present invention provides；
Fig. 4 is the structural representation of a kind of photovoltaic generating system that the embodiment of the present invention provides.
Detailed description of the invention
The present invention is described in further detail with embodiment below in conjunction with the accompanying drawings.It is understood that this
Specific embodiment described by place is used only for explaining the present invention, rather than limitation of the invention.The most also need
Be noted that for the ease of describing, accompanying drawing illustrate only part related to the present invention and not all in
Hold.
The embodiment of the present invention provides a kind of over-pressure safety device.Fig. 1 is that the one that the embodiment of the present invention provides is right
Photovoltaic DC-to-AC converter uses the structural representation of over-pressure safety device.As it is shown in figure 1, over-pressure safety device 13 is even
Being connected between photovoltaic substrate group string 11 and photovoltaic DC-to-AC converter 12, described over-pressure safety device 13 includes: first
Control unit 131 and protected location 132, wherein, described first control unit 131 and described protected location
132 connect, for the open-circuit voltage when described photovoltaic substrate group string 11 more than described photovoltaic DC-to-AC converter 12
During big input voltage, control described protected location 132 and open, described photovoltaic DC-to-AC converter 12 is protected.
It should be noted that when the open-circuit voltage of photovoltaic substrate group string 11 is defeated in the maximum of photovoltaic DC-to-AC converter 12
When entering in voltage range, over-pressure safety device 13 does not works, the i.e. first control unit 131 and protected location
132 do not work, and now, the input voltage of photovoltaic DC-to-AC converter 12 is the open-circuit voltage of photovoltaic substrate group string 11,
Belong to safe voltage；When the open-circuit voltage of photovoltaic substrate group string 11 inputs more than the maximum of photovoltaic DC-to-AC converter 12
During voltage, if this open-circuit voltage is input to photovoltaic DC-to-AC converter 12, may result in photovoltaic DC-to-AC converter 12 and damage
Bad, now, over-pressure safety device 13 is devoted oneself to work, and the first control unit 131 makes protected location 132
Open, so that the open-circuit voltage of photovoltaic substrate group string 11 can not be input to photovoltaic DC-to-AC converter 12, it is to avoid photovoltaic
Inverter 12 occurs damaging in the case of input overvoltage, and photovoltaic DC-to-AC converter 12 plays input overvoltage guarantor
The effect protected.
Fig. 2 is the structure that the another kind that the embodiment of the present invention provides uses over-pressure safety device to photovoltaic DC-to-AC converter
Schematic diagram.Alternatively, seeing Fig. 2, over-pressure safety device 13 also includes the first alarm unit 133, described
First alarm unit 133 is connected with described first control unit 131, wherein, and described first control unit 131
It is additionally operable to when the open-circuit voltage of described photovoltaic substrate group string 11 inputs more than the maximum of described photovoltaic DC-to-AC converter 12
During voltage, control described first alarm unit 133 and report to the police.
It should be noted that when the open-circuit voltage of photovoltaic substrate group string 11 is defeated in the maximum of photovoltaic DC-to-AC converter 12
When entering in voltage range, over-pressure safety device 13 does not works, and now the first control unit 131 and first is reported to the police
Unit 133 does not works；When the open-circuit voltage of photovoltaic substrate group string 11 is defeated more than the maximum of photovoltaic DC-to-AC converter 12
When entering voltage, over-pressure safety device 13 works, and now the first control unit 131 makes the first alarm unit 133
Opening, and report to the police, the mode of warning can use acoustical signal, it would however also be possible to employ optical signal, to remind
User disconnects the input line of photovoltaic DC-to-AC converter 12 as early as possible, and reduces the number of photovoltaic substrate group string 11, with fall
The open-circuit voltage of low photovoltaic substrate group string 11.
Alternatively, seeing Fig. 2, described over-pressure safety device 13 also includes the second control unit 134, described
Second control unit 134 is connected with described first control unit 131, wherein, and described first control unit 131
It is additionally operable to when the open-circuit voltage of described photovoltaic substrate group string 11 inputs more than the maximum of described photovoltaic DC-to-AC converter 12
During voltage, control described second control unit 134 and generate alarm signal, so that described photovoltaic DC-to-AC converter 12 exists
Report to the police under the control of described alarm signal.
It should be noted that it is above-mentioned, when the open-circuit voltage of photovoltaic substrate group string 11 is more than photovoltaic DC-to-AC converter 12
Maximum input voltage time, in addition to carrying out alarm by the first alarm unit 133, it is also possible to pass through
The carrying out of photovoltaic DC-to-AC converter 12 is reported to the police.The alarm signal carrying out reporting to the police for controlling photovoltaic DC-to-AC converter 12 can
Think low level signal, it is also possible to for high level signal, be according to concrete design depending on.Inverse by photovoltaic
Become the warning of device 12, may remind the user that the input line disconnecting photovoltaic DC-to-AC converter 12 as early as possible, and reduce photovoltaic
The number of substrate in batch string 11, to reduce the open-circuit voltage of photovoltaic substrate group string 11.
Fig. 3 is a kind of circuit diagram that photovoltaic DC-to-AC converter uses over-pressure safety device that the embodiment of the present invention provides.
Alternatively, seeing Fig. 3, the first control unit 131 of over-pressure safety device 13 includes: the first diode D1,
Second diode D2 and the first capacitor C1, wherein, described first diode D1 and the second diode D2 is equal
For transient voltage suppressor diode or Zener diode；The negative electrode of described first diode D1 and described photovoltaic
The positive pole of substrate in batch string 11 and the positive pole of described photovoltaic DC-to-AC converter 12 connect, the sun of described first diode D1
Pole and the negative electrode of described second diode D2, the positive plate of described first capacitor C1, described protected location
132 connect, the anode of described second diode D2 and the negative plate of described first capacitor C1 and described light
The negative pole of volt substrate in batch string 11 and the negative pole of described photovoltaic DC-to-AC converter 12 connect.
Described transient voltage suppressor diode (Transient Voltage Suppressor is called for short TVS) is
A kind of over-voltage protector with bi-directional voltage stabilizing characteristic and two-way negative resistance charactertistic, it be applied to various exchange and
In DC power supply circuit, it is used for suppressing transient overvoltage, thus protection circuit is not damaged by transient overvoltage.
Alternatively, the rated voltage of described first diode D1 is defeated equal to the maximum of described photovoltaic DC-to-AC converter 12
Enter voltage.When the circuit of actual design the first control unit 131, the volume of the first diode D1 can be chosen
Determine the voltage maximum input voltage equal to photovoltaic DC-to-AC converter 12, it is also possible to choose the specified of the first diode D1
Voltage is slightly larger than the maximum input voltage of photovoltaic DC-to-AC converter 12.
When the open-circuit voltage of photovoltaic substrate group string 11 is in the range of the maximum input voltage of photovoltaic DC-to-AC converter 12
First diode D1 is not turned on so that the first control unit 131 does not works, and not affects circuit, and works as
When the open-circuit voltage of photovoltaic substrate group string 11 is more than the maximum input voltage of photovoltaic DC-to-AC converter 12, the one or two pole
Pipe D1 turns on so that the first control unit 131 works, and will have voltage at the two ends of the first capacitor C1.
For convenience, if the voltage at the first capacitor C1 two ends is Vs.Voltage Vs can make protected location 132,
First alarm unit 133 and the second control unit 134 are opened.Additionally, the second diode D2 is used for clamper the
The voltage at one capacitor C1 two ends so that it is less than the rated voltage of the second diode D2.
Alternatively, seeing Fig. 3, the protected location 132 of over-pressure safety device 13 includes: the first resistance R1,
Second resistance R2 and the first NMOS tube Q1；One end of described first resistance R1 and described first control unit
The anode of the first diode D1 of 131 connects, the other end of described first resistance R1 and described second resistance
One end of R2 and the grid of described first NMOS tube Q1 connect, the drain electrode of described first NMOS tube Q1 and institute
The positive pole of the positive pole and described photovoltaic DC-to-AC converter 12 of stating photovoltaic substrate group string 11 connects, described first NMOS tube
The source electrode of Q1 and the other end of described second resistance R2 and the negative pole of described photovoltaic substrate group string 11 and described
The negative pole of photovoltaic DC-to-AC converter 12 connects.
When the open-circuit voltage of photovoltaic substrate group string 11 is more than the maximum input voltage of photovoltaic DC-to-AC converter 12, the
One diode D1 conducting, the two ends of the first capacitor C1 have voltage Vs, voltage Vs can make the first NMOS tube
Q1 turns on, and makes protected location 132 open, by the short circuit of photovoltaic substrate group string 11, according to photovoltaic substrate group string
The feature of 11, the open-circuit voltage of photovoltaic substrate group string 11 can decline rapidly, when open-circuit voltage drops to photovoltaic inversion
Time below the maximum input voltage of device 12, the first diode D1 can end.When the first diode D1 ends
After, the voltage Vs on the first capacitor C1 can be by returning that the first resistance R1 and the second resistance R2 etc. are constituted
Road discharges, and makes the first NMOS tube Q1 close, and the open-circuit voltage of photovoltaic substrate group string 11 rises again and exceedes
The maximum input voltage of photovoltaic DC-to-AC converter 12, makes again the first diode D1 conducting.First control unit 131
Just it is operated in this state being constantly turned on and off and makes the input voltage clamper of photovoltaic DC-to-AC converter 12 at it
Near maximum input voltage, to protect photovoltaic DC-to-AC converter 12 to be not damaged by.
Alternatively, the rated voltage of described second diode D2 is more than the unlatching electricity of described first NMOS tube Q1
Pressure.When actual design the first control unit 131 and protected location 132, the second diode D2 can be chosen
Rated voltage more than the cut-in voltage of the first NMOS tube Q1, such as can choose rated voltage is 12 volts
Second diode D2.As it has been described above, the second diode D2 is used for the voltage at clamper the first capacitor C1 two ends
Vs so that it is less than the rated voltage of the second diode D2, and voltage Vs can control the first NMOS tube Q1
Unlatching, if the rated voltage of the second diode D2 is more than the cut-in voltage of the first NMOS tube Q1, then electricity
Pressure Vs can control the unlatching of the first NMOS tube Q1 well, simultaneously when the open circuit of photovoltaic substrate group string 11
When voltage is excessive, the second diode D2 controls list to protected location the 132, first alarm unit 133 and second
Unit 134 may also operate as protective effect.
Alternatively, seeing Fig. 3, the first alarm unit 133 of over-pressure safety device 13 includes: the 3rd resistance
R3 and buzzer B1；One end of described 3rd resistance R3 and the one or two pole of described first control unit 131
The anode of pipe D1 connects, and the anode with described buzzer B1 of the other end of described 3rd resistance R3 is connected,
The negative terminal of described buzzer B1 and the negative pole of described photovoltaic substrate group string 11 and bearing of described photovoltaic DC-to-AC converter 12
Pole connects.
When the open-circuit voltage of photovoltaic substrate group string 11 is more than the maximum input voltage of photovoltaic DC-to-AC converter 12, the
One control unit 131 is devoted oneself to work, the voltage Vs at the first capacitor C1 two ends of the first control unit 131
The buzzer B1 making the first alarm unit 133 sounds a buzzer warning, reminds user to disconnect photovoltaic inversion as early as possible
The input line of device 12, and reduce the number of photovoltaic substrate group string 11, to reduce opening of photovoltaic substrate group string 11
Road voltage.
Alternatively, seeing Fig. 3, the second control unit 134 of over-pressure safety device 13 includes: the 4th resistance
R4 and photoelectrical coupler U1, wherein, described photoelectrical coupler U1 includes the first light emitting diode D3 and first
Phototriode Q2；Described 4th resistance R4 one end and the first diode of described first control unit 131
The anode of D1 connects, the other end of described 4th resistance R4 and first luminescence two of described photoelectrical coupler U1
The anode of pole pipe D3 connects, the negative electrode of described first light emitting diode D3 and described photovoltaic substrate group string 11
The negative pole of negative pole and described photovoltaic DC-to-AC converter 12 connects, first phototriode of described photoelectrical coupler U1
The colelctor electrode of Q2 is connected with the digital signal processor 121 in described photovoltaic DC-to-AC converter 12, described first photosensitive
The grounded emitter of triode Q2.
When the open-circuit voltage of photovoltaic substrate group string 11 is more than the maximum input voltage of photovoltaic DC-to-AC converter 12, the
One control unit 131 is devoted oneself to work, the voltage Vs at the first capacitor C1 two ends of the first control unit 131
Photoelectrical coupler U1 is made to turn on by the 4th resistance R4, due to first phototriode of photoelectrical coupler U1
The grounded emitter of Q2, so can give the photovoltaic DC-to-AC converter being connected with the colelctor electrode of the first phototriode Q2
Digital signal processor 121(Digital Signal Processor in 12, is called for short DSP) a low electricity
Ordinary mail number, digital signal processor 121 can be on the display floater of photovoltaic DC-to-AC converter 11 after receiving this signal
Display alarm information, reminds user with the form of Word message, disconnects the defeated of photovoltaic DC-to-AC converter the most as early as possible
Enter line, check whether the open-circuit voltage of photovoltaic substrate group string exceedes the maximum input voltage of photovoltaic DC-to-AC converter, and
Provide the maximum input voltage of photovoltaic DC-to-AC converter, simultaneously can be with display reminding information, such as photovoltaic substrate group
The open-circuit voltage of string not can exceed that the maximum input voltage of photovoltaic DC-to-AC converter, and otherwise, the photovoltaic thereby resulted in is inverse
Become device damage and be not belonging to warranty coverage.
The embodiment of the present invention also provides for a kind of photovoltaic generating system.Fig. 4 is the one that the embodiment of the present invention provides
The structural representation of photovoltaic generating system.See Fig. 4, photovoltaic generating system include photovoltaic substrate group string 21,
Photovoltaic DC-to-AC converter 22 and over-pressure safety device 23, and over-pressure safety device 23 is connected to photovoltaic substrate group string 21
And between photovoltaic DC-to-AC converter 22, for the open-circuit voltage when photovoltaic substrate group string 21 more than photovoltaic DC-to-AC converter 22
Maximum input voltage time photovoltaic DC-to-AC converter 22 is protected.Wherein, on over-pressure safety device 23 uses
The over-pressure safety device stated.Photovoltaic DC-to-AC converter is protected in the case of input overvoltage by this over-pressure safety device
Protect, thus also achieve and photovoltaic generating system is protected.
The over-pressure safety device of embodiment of the present invention offer and photovoltaic generating system, filled by this overvoltage protection
The first control unit in putting and protected location, control the input voltage of photovoltaic DC-to-AC converter at photovoltaic DC-to-AC converter
Maximum input voltage in the range of, can avoid when the open-circuit voltage of photovoltaic substrate group string is more than photovoltaic DC-to-AC converter
Maximum input voltage time cause photovoltaic DC-to-AC converter to damage, photovoltaic DC-to-AC converter is played input overvoltage protection work
With；Additionally, by the first alarm unit in this over-pressure safety device and the second control unit, when photovoltaic base
Can be sent out when the open-circuit voltage of plate group string is more than the maximum input voltage of photovoltaic DC-to-AC converter alarm for
Remind user to disconnect the input line of photovoltaic DC-to-AC converter as early as possible, and reduce the number of photovoltaic substrate group string, to reduce
The open-circuit voltage of photovoltaic substrate group string.
Note, above are only presently preferred embodiments of the present invention and institute's application technology principle.Those skilled in the art
It will be appreciated that the invention is not restricted to specific embodiment described here, can enter for a person skilled in the art
Row various obvious changes, readjust and substitute without departing from protection scope of the present invention.Therefore, though
So by above example, the present invention is described in further detail, but the present invention be not limited only to
Upper embodiment, without departing from the inventive concept, it is also possible to include other Equivalent embodiments more,
And the scope of the present invention is determined by scope of the appended claims.
Claims (8)
1. an over-pressure safety device, it is inverse with photovoltaic that described over-pressure safety device is connected to photovoltaic substrate group string
Become between device, it is characterised in that described over-pressure safety device includes: the first control unit, the second control list
Unit and protected location, wherein,
Described first control unit is connected with described protected location, for when the open circuit of described photovoltaic substrate group string
When voltage is more than the maximum input voltage of described photovoltaic DC-to-AC converter, controls described protected location and open, to described
Photovoltaic DC-to-AC converter is protected；
Described second control unit is connected with described first control unit, and wherein, described first control unit is also
During for being more than the maximum input voltage of described photovoltaic DC-to-AC converter when the open-circuit voltage of described photovoltaic substrate group string,
Control described second control unit and generate alarm signal, so that described photovoltaic DC-to-AC converter is in described alarm signal
Report to the police under control.
Over-pressure safety device the most according to claim 1, it is characterised in that described overvoltage protection fills
Putting and also include the first alarm unit, described first alarm unit is connected with described first control unit, wherein,
Described first control unit is additionally operable to when the open-circuit voltage of described photovoltaic substrate group string is more than described photovoltaic DC-to-AC converter
Maximum input voltage time, control described first alarm unit and report to the police.
Over-pressure safety device the most according to claim 2, it is characterised in that described first controls list
Unit includes: the first diode, the second diode and the first capacitor, wherein, and described first diode and
Two diodes are transient voltage suppressor diode or Zener diode；
The negative electrode of described first diode and the positive pole of described photovoltaic substrate group string and described photovoltaic DC-to-AC converter are just
Pole connects, the anode of described first diode and the negative electrode of described second diode, described first capacitor
Positive plate, described protected location connect, the anode of described second diode and bearing of described first capacitor
Pole plate is connected with the described negative pole of photovoltaic substrate group string and the negative pole of described photovoltaic DC-to-AC converter.
Over-pressure safety device the most according to claim 3, it is characterised in that described protected location bag
Include: the first resistance, the second resistance and the first NMOS tube；
One end of described first resistance is connected with the anode of the first diode of described first control unit, described
The other end of the first resistance is connected with the grid of one end of described second resistance and described first NMOS tube, institute
The positive pole of the drain electrode and the positive pole of described photovoltaic substrate group string and described photovoltaic DC-to-AC converter of stating the first NMOS tube connects
Connect, the source electrode of described first NMOS tube and the other end of described second resistance and described photovoltaic substrate group string
Negative pole and described photovoltaic DC-to-AC converter negative pole connect.
Over-pressure safety device the most according to claim 4, it is characterised in that described first diode
Rated voltage equal to the maximum input voltage of described photovoltaic DC-to-AC converter；
The rated voltage of described second diode is more than the cut-in voltage of described first NMOS tube.
Over-pressure safety device the most according to claim 4, it is characterised in that described first warning is single
Unit includes: the 3rd resistance and buzzer；
One end of described 3rd resistance is connected with the anode of the first diode of described first control unit, described
The anode with described buzzer of the other end of the 3rd resistance is connected, the negative terminal of described buzzer and described photovoltaic
The negative pole of substrate in batch string and the negative pole of described photovoltaic DC-to-AC converter connect.
Over-pressure safety device the most according to claim 4, it is characterised in that described second controls list
Unit includes: the 4th resistance and photoelectrical coupler, and wherein, described photoelectrical coupler includes the first light emitting diode
With the first phototriode；
Described 4th resistance one end is connected with the anode of the first diode of described first control unit, and described
The other end of four resistance is connected with the anode of the first light emitting diode of described photoelectrical coupler, described first
The negative electrode of optical diode is connected with the described negative pole of photovoltaic substrate group string and the negative pole of described photovoltaic DC-to-AC converter, institute
State colelctor electrode and the Digital Signal Processing in described photovoltaic DC-to-AC converter of the first phototriode of photoelectrical coupler
Device connects, the grounded emitter of described first phototriode.
8. a photovoltaic generating system, it is characterised in that include photovoltaic substrate group string, photovoltaic DC-to-AC converter and
Over-pressure safety device according to any one of the claims 1-7, described over-pressure safety device is connected to institute
State between photovoltaic substrate group string and described photovoltaic DC-to-AC converter, for when the open-circuit voltage of described photovoltaic substrate group string
During more than the maximum input voltage of described photovoltaic DC-to-AC converter, described photovoltaic DC-to-AC converter is protected.
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| CN105450058B (en) | 2014-06-20 | 2018-03-16 | 华为技术有限公司 | A kind of inverter and its control device, control method and inverter system |
| CN105827179B (en) * | 2015-01-04 | 2018-09-07 | 华为技术有限公司 | A kind of photovoltaic system |
| CN109560537A (en) * | 2017-09-27 | 2019-04-02 | 深圳光峰科技股份有限公司 | A kind of optocoupler overvoltage crowbar and associated appliance |
| CN111668868A (en) | 2020-05-08 | 2020-09-15 | 华为技术有限公司 | Photovoltaic power generation system and method |
| CN114123735B (en) * | 2020-08-31 | 2024-05-03 | 华为数字能源技术有限公司 | Series-parallel converter protection system, controller and converter |
| CN114665518B (en) * | 2022-05-25 | 2022-10-14 | 深圳市中旭新能源有限公司 | Household ultra-long string photovoltaic system, power optimization device and overvoltage protection method |
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| JPH07147726A (en) * | 1993-11-26 | 1995-06-06 | Fuji Electric Co Ltd | Overvoltage limiting circuit of semiconductor device |
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| CN102035169A (en) * | 2009-09-28 | 2011-04-27 | 研祥智能科技股份有限公司 | Input overvoltage protection circuit and DC-DC power supply conversion device |
| CN202034775U (en) * | 2011-01-21 | 2011-11-09 | 东莞市茂扬科技股份有限公司 | Load overvoltage suppression circuit |
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