CN206041486U - Direct current joins conversely indicating circuit and photovoltaic inverter circuit thereof - Google Patents
Direct current joins conversely indicating circuit and photovoltaic inverter circuit thereof Download PDFInfo
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- CN206041486U CN206041486U CN201621106487.2U CN201621106487U CN206041486U CN 206041486 U CN206041486 U CN 206041486U CN 201621106487 U CN201621106487 U CN 201621106487U CN 206041486 U CN206041486 U CN 206041486U
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Abstract
The utility model discloses a direct current joins conversely indicating circuit and photovoltaic inverter circuit thereof. The direct current joins conversely that indicating circuit includes the series connection a plurality ofly prevents a plurality of current -limiting resistor of anti - diode, series connection, a plurality of voltage limiting resistance of series connection, a plurality of alarm device of series connection. A plurality of voltage limiting resistance after the series connection is established ties, a plurality of after establishing ties prevent anti - diode, a plurality of current -limiting resistor after establishing ties, and hold as two wiring that the direct current joins conversely indicating circuit at both ends around and: corresponding the wiring end of preventing anti - diode anode one side and being the electrode negative line terminal, the corresponding wiring end of preventing anti - diode negative pole one side is for bearing the end of working a telephone switchboard. On a plurality of voltage limiting resistance of a plurality of alarm device parallel connection after establishing ties after the series connection. The utility model discloses can accomplish the direct current and join conversely instruction function, still have simple structure, the strong advantage of obvious, the considerable visuality of caution signal, need not the power supply, there are not the hysteresis in detection, response yet, need not the reverse current return circuit and establish in advance, need not to inspect whether closed direct current switch is.
Description
Technical field
The utility model is related to a kind of circuit, more particularly to a kind of DC reverse connection indicating circuit and has the DC reverse connection
The photovoltaic inverter circuit of indicating circuit.
Background technology
If the positive negative input of photovoltaic DC-to-AC converter DC side is reversed, electric current can constitute reversely electricity by IGBT anti-paralleled diodes
Stream circulation path, the switching device and IGBT anti-paralleled diode excessively streams that can cause DC side series connection burn, thus inverse to photovoltaic
Whether change device direct current input polarity connects and becomes extremely important to carrying out detection.
As shown in Figures 1 and 2, the common method at present the positive negative input polarity of 1 DC side of photovoltaic DC-to-AC converter being detected
It is to seal in current sensor 3 in direct current input circuit, after DC side reverse polarity connection, opposite direction produces negative current can be electric
Flow sensor 3 detects and delivers to main control unit 4, the control photovoltaic DC-to-AC converter 1 of main control unit 4 shuts down, the information that gives a warning or
Disengage dc switch 2.
There is following three aspects deficiency in the scheme that the detection direct current of above-mentioned introduction is reversed：
1., the program is to detect reversing the current to judge based on current sensor 3, if 4 dead electricity of main control unit or electricity
When flow sensor 3 is not powered, it is impossible to detect electric current and judge, the program is just infeasible；
2., in the program, reverse current signal detection, response existence time have certain hysteresis quality, not intuitively, do not have
Foresight in advance, reversing the current loop must first be set up, can just provide instruction warning message, may already lead to IGBT
Damage through stream；
3., the program must dc switch 4 be under closure condition, to constitute reverse current path, it is and existing in practical application
, preferably can just detect in the case of dc switch 4 is not closed whether direct current is reversed, so as to avoid producing unnecessary event
Barrier event.
Utility model content
For above-mentioned technological deficiency, the utility model provides a kind of DC reverse connection indicating circuit and has the DC reverse connection
The photovoltaic inverter circuit of indicating circuit, its complete DC reverse connection indicate function while, also with simple structure, caution signal
Substantially, the strong advantage of considerable visuality, and unlike conventional art need power supply, detection, response do not exist yet it is delayed, especially
Set up without the need for reversing the current loop in advance, can guarantee that inversion unit i.e. IGBT is not damaged by, and due to be connected in parallel in it is inverse
Become unit, therefore need not check whether dc switch closes.
Solution of the present utility model is：A kind of DC reverse connection indicating circuit, which includes some counnter attacks being connected in series
Diode, some current-limiting resistances being connected in series, some pressure limiting resistance being connected in series, some alarms being connected in series；String
The some current-limiting resistances after some pressure limiting resistance, some counnter attack diodes after series connection, series connection after connection connection series connection, and in front and back
Two terminals of the two ends as the DC reverse connection indicating circuit, wherein, the terminals of correspondence counnter attack diode anode side
For positive terminals, the terminals of correspondence counnter attack diode cathode side are negative terminals；Some alarms after series connection are in parallel even
It is connected on some pressure limiting resistance after series connection.
Used as the further improvement of such scheme, the alarm is sound flash alarm system device.
Further, the alarm is the sound flash alarm system device for carrying LED light.
Used as the further improvement of such scheme, the alarm is light emitting diode.
Used as the further improvement of such scheme, some counnter attack diodes are diode D1 and diode D2；Some current limlitings
Resistance is resistance R1；Some pressure limiting resistance are resistance R2～Rn, and wherein n is the positive integer more than 2；Resistance R1～Rn is gone here and there successively
Connect, and one end is used as the negative terminals, the other end connects the anode of diode D1, the negative electrode connection diode D2 of diode D1
Anode, the negative electrode of diode D2 is used as the positive terminals.
The utility model also provides a kind of photovoltaic inverter circuit, and which includes inversion unit, is connected in parallel in the inversion list
Unit and the direct current for detecting the inversion unit are input into whether reversed DC reverse connection indicating circuit；The DC reverse connection is indicated
Some pressure limiting electricity that circuit includes some counnter attack diodes being connected in series, some current-limiting resistances being connected in series, is connected in series
Resistance, some alarms being connected in series；Be connected in series series connection after some pressure limiting resistance, series connection after some counnter attack diodes,
Some current-limiting resistances after series connection, and rear and front end is used as two terminals of the DC reverse connection indicating circuit, wherein, correspondence
The terminals of counnter attack diode anode side are the input that positive terminals connect inversion unit, corresponding counnter attack diode cathode one
The terminals of side are the output end that negative terminals connect the inversion unit；Some alarms after series connection are connected in parallel in series connection
On some pressure limiting resistance afterwards.
Used as the further improvement of such scheme, the alarm is sound flash alarm system device or is light emitting diode.
Further, the alarm is the sound flash alarm system device for carrying LED light.
Used as the further improvement of such scheme, some counnter attack diodes are diode D1 and diode D2；Some current limlitings
Resistance is resistance R1；Some pressure limiting resistance are resistance R2～Rn, and wherein n is the positive integer more than 2；Resistance R1～Rn is gone here and there successively
Connect, and one end is used as the negative terminals, the other end connects the anode of diode D1, the negative electrode connection diode D2 of diode D1
Anode, the negative electrode of diode D2 is used as the positive terminals.
Used as the further improvement of such scheme, the photovoltaic inverter circuit also includes being connected in parallel in the inversion unit
Dc switch.
The program has several advantages relative to prior art：
1., for direct current input polarity can make early warning instruction in advance, it is the not closed situation of dc switch in DC side air switch
The polarity of direct current input is just can determine whether down, device failure in IGBT and other DC side series loops is prevented；
2. it is independent of whether inverter system goes up electricity, is independent of external detection device；
3. simple, using sound, light alarm mode, caution signal is substantially, considerable visual strong.
Description of the drawings
Fig. 1 is the detection inverter whether reversed available circuit figure of direct current.
Fig. 2 is the detection inverter whether reversed another kind of available circuit figure of direct current.
Circuit diagrams of the Fig. 3 for the DC reverse connection indicating circuit of the utility model embodiment 1.
Circuit diagrams of the Fig. 4 for the DC reverse connection indicating circuit of the utility model embodiment 2.
Specific embodiment
In order that the purpose of this utility model, technical scheme and advantage become more apparent, below in conjunction with accompanying drawing and enforcement
Example, is further elaborated to the utility model.It should be appreciated that specific embodiment described herein is only to explain
The utility model, is not used to limit the utility model.
Embodiment 1
Fig. 3 is referred to, photovoltaic inverter circuit of the present utility model includes inversion unit 1, DC reverse connection indicating circuit, direct current
Switch 2.Dc switch 2 is connected in parallel in inversion unit 1, and DC reverse connection indicating circuit is connected in parallel in inversion unit 1 and is used for
Whether the direct current input of detection inversion unit 1 is reversed.
DC reverse connection indicating circuit include some counnter attack diodes being connected in series, some current-limiting resistances being connected in series,
The some pressure limiting resistance being connected in series, some alarms being connected in series.It is connected in series some pressure limiting resistance after series connection, series connection
Some current-limiting resistances after rear some counnter attack diodes, series connection, and rear and front end is used as the DC reverse connection indicating circuit
Two terminals, wherein, the terminals of correspondence counnter attack diode anode side are the input that positive terminals connect inversion unit 1
End, the terminals of correspondence counnter attack diode cathode side are the output end that negative terminals connect the inversion unit 1.After series connection
Some alarms are connected in parallel on some pressure limiting resistance after series connection.
In the present embodiment, some counnter attack diodes are diode D1 and diode D2；Some current-limiting resistances are resistance R1；
Some pressure limiting resistance are resistance R2～Rn, and wherein n is the positive integer more than 2.Resistance R1～Rn is sequentially connected in series, and one end is used as institute
Negative terminals are stated, the other end connects the anode of diode D1, and the negative electrode of diode D1 connects the anode of diode D2, diode D2
Negative electrode as the positive terminals.The alarm is light emitting diode.
Referring to Fig. 3, that is to say, that the DC reverse connection indicating circuit in embodiment 1 is mainly by current-limiting resistance R2, R3
～Rn, pressure limiting resistance R1, counnter attack diode D1, D2 and Warning indicator (i.e. alarm) D3 are constituted, and alarm can be
Light emitting diode, LED light or sound and light alarm device.
After direct current input is reversed, the dotted line of opposite direction current flow paths such as Fig. 3, diode D1, D2 forward conduction, this
When light emitting diode or LED light and audible and visual alarm device can light or send sound, for reminding operating personnel's direct current
Input is reversed.Current-limiting resistance R2, R3～Rn is played and is limited the electric current for flowing through Warning indicator, it is to avoid overcurrent damage, limit
Piezoresistance R1 plays restriction Warning indicator terminal voltage, it is to avoid excessive pressure damages.Diode D1, D2 are input into reverse polarity connection in direct current
When constitute reversing the current circulation path, and direct current input polarity access it is errorless when, blocking voltage.
Embodiment 2
Fig. 4 is referred to, the photovoltaic inverter circuit of embodiment 2 is essentially identical with the photovoltaic inverter circuit of embodiment 1, its difference
It is：The alarm of the photovoltaic inverter circuit of embodiment 2 is not diode but sound flash alarm system device, specially carries LED and indicates
The sound flash alarm system device of lamp, therefore, caution signal is substantially, considerable visual strong.
Preferred embodiment of the present utility model is the foregoing is only, it is not to limit the utility model, all at this
Any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (10)
1. a kind of DC reverse connection indicating circuit, it is characterised in that：Which includes some counnter attack diodes being connected in series, is connected in series
Some current-limiting resistances, some pressure limiting resistance being connected in series, some alarms being connected in series；If being connected in series after series connection
The some current-limiting resistances after some counnter attack diodes, series connection after dry pressure limiting resistance, series connection, and rear and front end is used as the direct current
Two terminals of reversal connection indicating circuit, wherein, the terminals of correspondence counnter attack diode anode side are positive terminals, corresponding anti-
The terminals of anti-diode cathode side are negative terminals；Some alarms after series connection are connected in parallel in some limits after series connection
On piezoresistance.
2. DC reverse connection indicating circuit as claimed in claim 1, it is characterised in that：The alarm is sound flash alarm system device.
3. DC reverse connection indicating circuit as claimed in claim 2, it is characterised in that：The alarm is carrying LED light
Sound flash alarm system device.
4. DC reverse connection indicating circuit as claimed in claim 1, it is characterised in that：The alarm is light emitting diode.
5. DC reverse connection indicating circuit as claimed in claim 1, it is characterised in that：Some counnter attack diodes be diode D1 and
Diode D2；Some current-limiting resistances are resistance R1；Some pressure limiting resistance are resistance R2～Rn, and wherein n is the positive integer more than 2；
Resistance R1～Rn is sequentially connected in series, and one end, used as the negative terminals, the other end connects the anode of diode D1, diode D1's
Negative electrode connects the anode of diode D2, and the negative electrode of diode D2 is used as the positive terminals.
6. a kind of photovoltaic inverter circuit, which includes inversion unit, is connected in parallel in the inversion unit and for detecting described inverse
Become the direct current input of unit whether reversed DC reverse connection indicating circuit；It is characterized in that：The DC reverse connection indicating circuit bag
Some pressure limiting resistance for include some counnter attack diodes being connected in series, some current-limiting resistances being connected in series, being connected in series, series connection
Some alarms of connection；Be connected in series series connection after some pressure limiting resistance, series connection after some counnter attack diodes, series connection after
Some current-limiting resistances, and rear and front end is used as two terminals of the DC reverse connection indicating circuit, wherein, two pole of correspondence counnter attack
The terminals of tube anode side are the input that positive terminals connect inversion unit, the wiring of corresponding counnter attack diode cathode side
Hold the output end for connecting the inversion unit for bearing terminals；Some alarms after series connection are connected in parallel in some after connecting
On pressure limiting resistance.
7. photovoltaic inverter circuit as claimed in claim 6, it is characterised in that：The alarm is sound flash alarm system device or is luminous
Diode.
8. photovoltaic inverter circuit as claimed in claim 7, it is characterised in that：The alarm is the sound for carrying LED light
Light alarm.
9. photovoltaic inverter circuit as claimed in claim 6, it is characterised in that：Some counnter attack diodes are diode D1 and two poles
Pipe D2；Some current-limiting resistances are resistance R1；Some pressure limiting resistance are resistance R2～Rn, and wherein n is the positive integer more than 2；Resistance
R1～Rn is sequentially connected in series, and one end, used as the negative terminals, the other end connects the anode of diode D1, the negative electrode of diode D1
The anode of connection diode D2, the negative electrode of diode D2 is used as the positive terminals.
10. photovoltaic inverter circuit as claimed in claim 6, it is characterised in that：The photovoltaic inverter circuit also includes in parallel company
It is connected to the dc switch of the inversion unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621106487.2U CN206041486U (en) | 2016-10-09 | 2016-10-09 | Direct current joins conversely indicating circuit and photovoltaic inverter circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621106487.2U CN206041486U (en) | 2016-10-09 | 2016-10-09 | Direct current joins conversely indicating circuit and photovoltaic inverter circuit thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206041486U true CN206041486U (en) | 2017-03-22 |
Family
ID=58297872
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621106487.2U Active CN206041486U (en) | 2016-10-09 | 2016-10-09 | Direct current joins conversely indicating circuit and photovoltaic inverter circuit thereof |
Country Status (1)
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|---|---|
| CN (1) | CN206041486U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106877816A (en) * | 2017-03-31 | 2017-06-20 | 阳光电源股份有限公司 | A kind of photovoltaic group string reversal connection detection method and device |
| CN112596000A (en) * | 2020-12-02 | 2021-04-02 | 爱士惟新能源技术(江苏)有限公司 | Method and device for detecting reverse connection of PV input ends of photovoltaic inverters |
| CN112731841A (en) * | 2020-12-26 | 2021-04-30 | 陕西航空电气有限责任公司 | Communication circuit of controller of aviation high-voltage brushless direct-current motor |
| WO2021253155A1 (en) * | 2020-06-15 | 2021-12-23 | 华为数字能源技术有限公司 | Protection circuit for preventing misconnection of input ends, and photovoltaic power generation system |
| CN114002612A (en) * | 2021-10-26 | 2022-02-01 | 珠海格力电器股份有限公司 | Reverse connection detection circuit and method and power supply system |
-
2016
- 2016-10-09 CN CN201621106487.2U patent/CN206041486U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106877816A (en) * | 2017-03-31 | 2017-06-20 | 阳光电源股份有限公司 | A kind of photovoltaic group string reversal connection detection method and device |
| WO2021253155A1 (en) * | 2020-06-15 | 2021-12-23 | 华为数字能源技术有限公司 | Protection circuit for preventing misconnection of input ends, and photovoltaic power generation system |
| CN112596000A (en) * | 2020-12-02 | 2021-04-02 | 爱士惟新能源技术(江苏)有限公司 | Method and device for detecting reverse connection of PV input ends of photovoltaic inverters |
| CN112731841A (en) * | 2020-12-26 | 2021-04-30 | 陕西航空电气有限责任公司 | Communication circuit of controller of aviation high-voltage brushless direct-current motor |
| CN114002612A (en) * | 2021-10-26 | 2022-02-01 | 珠海格力电器股份有限公司 | Reverse connection detection circuit and method and power supply system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |