CN106207960B - Circuit is protected for the fictitious load of photovoltaic DC-to-AC converter - Google Patents
Circuit is protected for the fictitious load of photovoltaic DC-to-AC converter Download PDFInfo
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- CN106207960B CN106207960B CN201610766012.4A CN201610766012A CN106207960B CN 106207960 B CN106207960 B CN 106207960B CN 201610766012 A CN201610766012 A CN 201610766012A CN 106207960 B CN106207960 B CN 106207960B
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- fictitious load
- voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
- H02H3/202—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage for dc systems
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Abstract
The present invention provides a kind of fictitious load for photovoltaic DC-to-AC converter and protects circuit; including PV voltages positive input, PV voltage negative inputs, charging capacitor, fictitious load branch, fictitious load access excision controlling brancher and fictitious load protection branch are parallel between PV voltages positive input and PV voltage negative inputs.The fictitious load protects circuit in PV voltage positive inputs, fictitious load is equipped between PV voltage negative inputs and protects branch, the protection circuit voltage output terminal of fictitious load protection branch is connect with fet gate, when the voltage between PV voltages positive input and PV voltage negative inputs is more than the rotection thresholds of setting, protection circuit voltage output terminal output signal ends field-effect tube, dummy resistance is cut off from circuit, no matter whether power module works normally in this way, fictitious load can effectively be cut off, fictitious load is avoided to be burned out, so as to achieve the purpose that protect fictitious load.
Description
Technical field
The present invention relates to a kind of photovoltaic DC-to-AC converter, more particularly to a kind of fictitious load used in photovoltaic DC-to-AC converter circuit is protected
Protection circuit.
Background technology
With the increasingly increasingly exacerbation of shortage and environmental pollution of the energy, clean energy resource, regenerative resource become current
The field that countries in the world are given priority to, wherein photovoltaic power generation technology because its have many advantages, such as green, environmental protection, it is renewable increasingly by
To the attention and welcome of people.In photovoltaic power generation technology, for the direct current energy that photovoltaic module generates to be converted to alternating current
The inverter of energy is the critical component of entire photovoltaic power generation technology.
In the inverter course of work, the PV ends of inverter circuit are connect with solar panel, are led in inverter circuit
One fictitious load can be often set for checking whether solar panel output voltage is stablized, to prevent PV voltages from being opened in power module
Dynamic threshold value, which nearby fluctuates, causes equipment frequent starting.Conventional inverter dummy load circuit is as shown in Figure 1, it is assumed that the input electricity of PV
It presses as U1, the cut-in voltage of power module is U2, works as U1<During U2, power module 1 starts not yet, and triode Q2 is at this time
Cut-off state, then the grid A point current potentials of field-effect tube Q1 are connected by zener diode D1 clampers in 15V, field-effect tube Q1, false
Load resistance R1 is tapped into circuit.Work as U1>During U2, power module work, generation+5V power supplys act on Q2 by resistance R5
Grid is connected triode Q2, A point current potentials is dragged down, and ends field-effect tube Q1, and dummy resistance R1 branches are disconnected.
Above for traditional fictitious load branch connection there are certain defect, as input voltage U1>During U2, sometimes because
The failure of power module causes+5V power supplys to disappear, and thus triode Q2 can be made to end always, and A points current potential is 15V at this time, is led
It causes dummy resistance R1 branches that cannot be removed, is connected on C1 both ends for a long time, may result in fictitious load in this way and burn.
Invention content
In view of the foregoing deficiencies of prior art, the vacation of inverter can be born the purpose of the present invention is to provide a kind of
It is loaded into the protection circuit of row effective protection.
In order to achieve the above objects and other related objects, the present invention provides a kind of fictitious load for photovoltaic DC-to-AC converter and protects
Circuit, including PV voltages positive input, PV voltage negative inputs, the PV voltages positive input, PV voltage negative senses are defeated
Enter the positive input at end and inverter power supply module, negative input is connect, the PV voltages positive input and PV voltages
Charging capacitor, fictitious load branch, fictitious load access excision controlling brancher and fictitious load protection branch are parallel between negative input
Road, the fictitious load branch include dummy resistance and field-effect tube, one end and the PV voltage positive inputs of dummy resistance
Connection, the other end of dummy resistance and the drain electrode of field-effect tube connect, source electrode and the PV voltage negative inputs of field-effect tube
Connection；Fictitious load protection branch includes a protection circuit voltage output terminal, the protection circuit voltage output terminal with it is described
Fet gate connects, when the voltage between the PV voltages positive input and PV voltage negative inputs is more than setting
During rotection thresholds, the protection circuit voltage output terminal output signal ends the field-effect tube.
Preferably, fictitious load access excision controlling brancher circuit include first resistor, zener diode, triode,
Second resistance and 3rd resistor, one end of first resistor are connect with PV voltage positive inputs, the other end of first resistor with it is steady
The collector connection of the cathode, triode of diode is pressed, the anode of zener diode is connect with PV voltage negative inputs, three poles
The emitter of pipe is connect with PV voltage negative inputs, and the base stage of triode is connect with second resistance, 3rd resistor, second resistance
The other end connect with+5V power supplys, the other end of 3rd resistor is connect with PV voltage negative inputs.
Preferably, the fictitious load protection branch includes the 4th resistance, the 5th resistance and controllable accurate source of stable pressure, the 4th electricity
One end of resistance is connect with PV voltage positive inputs, the other end and the 5th resistance of the 4th resistance, the ginseng of controllable accurate source of stable pressure
Pole connection is examined, the other end of the 5th resistance is connect with PV voltage negative inputs, anode and the PV voltages of controllable accurate source of stable pressure
Negative input connects, and the cathode of controllable accurate source of stable pressure connects as protection circuit voltage output terminal and the grid of field-effect tube
It connects.
As described above, the present invention's has the advantages that for the fictitious load protection circuit of photovoltaic DC-to-AC converter：The vacation
Load protection circuit is equipped with fictitious load between PV voltages positive input, PV voltage negative inputs and protects branch, fictitious load
The protection circuit voltage output terminal of protection branch is connect with fet gate, when PV voltages positive input and PV voltage negative senses
When voltage between input terminal is more than the rotection thresholds of setting, protection circuit voltage output terminal output signal cuts field-effect tube
Only, dummy resistance is cut off from circuit, no matter whether power module works normally in this way, and fictitious load can be avoided to be burnt
It ruins, so as to achieve the purpose that protect fictitious load.
Description of the drawings
Fig. 1 is the circuit diagram of conventional inverter dummy load circuit.
Fig. 2 is the circuit diagram of the embodiment of the present invention.
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Disclosed content understands other advantages and effect of the present invention easily.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also be based on different viewpoints with application, without departing from
Various modifications or alterations are carried out under the spirit of the present invention.
Please refer to Fig.1,2.It should be noted that the diagram provided in the present embodiment only illustrates the present invention in a schematic way
Basic conception, component count, shape when only display is with related component in the present invention rather than according to actual implementation in schema then
Shape and size are drawn, and kenel, quantity and the ratio of each component can be a kind of random change during actual implementation, and its component cloth
Office's kenel may also be increasingly complex.
As shown in Fig. 2, the present invention, which provides a kind of fictitious load for photovoltaic DC-to-AC converter, protects circuit, including PV voltages forward direction
Input terminal PV-In+, PV voltage negative input PV-In-, PV voltage positive input PV-In+, PV voltage negative input PV-
The positive input of the power module 1 of in- and inverter, negative input connection, PV voltage positive inputs PV-In+, PV electricity
Press negative input PV-Charging capacitor C1, fictitious load branch, fictitious load access excision controlling brancher and vacation are parallel between in-
Load protection branch.Fictitious load branch includes dummy resistance R1 and field-effect tube Q1, one end and the PV electricity of dummy resistance R1
Press positive input PV-In+ connections, the other end of dummy resistance R1 are connect with the drain electrode of field-effect tube Q1, field-effect tube Q1
Source electrode and PV voltage negative inputs PV-In- connections.
Fictitious load protection branch includes the 4th resistance R3, the 5th resistance R4 and controllable accurate source of stable pressure IC1, the 4th resistance R3
One end connect with PV voltage positive inputs, the other end and the 5th resistance R4, the controllable accurate source of stable pressure IC1 of the 4th resistance R3
The connection of reference pole, the other end of the 5th resistance R4 connect with PV voltage negative inputs, the anode of controllable accurate source of stable pressure IC1
It is connect with PV voltage negative inputs, the cathode of controllable accurate source of stable pressure IC1 is as protection circuit voltage output terminal and field-effect
The grid connection of pipe Q1.When the voltage U1 between PV voltages positive input and PV voltage negative inputs is more than the protection of setting
During threshold value U3, protection circuit voltage output terminal output signal ends field-effect tube Q1.Controllable accurate source of stable pressure IC1 selects chip
TL431。
Fictitious load access excision controlling brancher circuit includes first resistor R2, zener diode D1, triode Q2, the second electricity
Hinder R5 and 3rd resistor R6, one end of first resistor R2 connect with PV voltage positive inputs, the other end of first resistor R2 and
The collector connection of the cathode, triode Q2 of zener diode D1, anode and the PV voltage negative inputs of zener diode D1
Connection, the emitter of triode Q2 are connect with PV voltage negative inputs, base stage and second resistance R5, the third electricity of triode Q2
R6 connections are hindered, the other end of second resistance R5 is connect with+5V power supplys, the other end and the PV voltage negative inputs of 3rd resistor R6
Connection.
The fictitious load protection circuit of the photovoltaic DC-to-AC converter is added on the basis of original circuit by the 4th resistance R3, the 5th
The fictitious load protection branch of resistance R4 and controllable accurate source of stable pressure IC1 compositions.Work as U1>During U3, B point current potentials pass through the 4th resistance
The partial pressure of R3, the 5th resistance R4 higher than the reference voltage of controllable accurate source of stable pressure IC1, are connected controllable accurate source of stable pressure IC1,
A point current potentials are dragged down, ends field-effect tube Q1, fictitious load is cut off.No matter whether power module work is normal in this way, all can
A point current potentials are dragged down, fictitious load is cut off.So as to achieve the purpose that protect fictitious load.
The fictitious load is protected circuit to be equipped with fictitious load between PV voltages positive input, PV voltage negative inputs and is protected
Branch, the protection circuit voltage output terminal of fictitious load protection branch is connect with fet gate, when PV voltage positive inputs
When voltage between PV voltage negative inputs is more than the rotection thresholds U3 of setting, circuit voltage output terminal output signal is protected
End field-effect tube, dummy resistance is cut off from circuit, no matter whether power module works normally in this way, can avoid
Fictitious load is burned out, so as to achieve the purpose that protect fictitious load.So the present invention effectively overcome it is of the prior art it is various lack
It puts and has high industrial utilization.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all can carry out modifications and changes under the spirit and scope without prejudice to the present invention to above-described embodiment.Cause
This, those of ordinary skill in the art is complete without departing from disclosed spirit and institute under technological thought such as
Into all equivalent modifications or change, should by the present invention claim be covered.
Claims (3)
1. circuit is protected in a kind of fictitious load for photovoltaic DC-to-AC converter, inputted including PV voltages positive input, PV voltages negative sense
End, the PV voltages positive input, PV voltages negative input and positive input, the negative sense of inverter power supply module input
End connection, it is characterised in that：Charging capacitor is parallel between the PV voltages positive input and PV voltage negative inputs
（C1）, fictitious load branch, fictitious load access excision controlling brancher and fictitious load protection branch, the fictitious load branch includes false negative
Carry resistance（R1）And field-effect tube（Q1）, dummy resistance（R1）One end connect with PV voltage positive inputs, fictitious load electricity
Resistance（R1）The other end and field-effect tube（Q1）Drain electrode connection, field-effect tube（Q1）Source electrode and PV voltages negative input connect
It connects；The fictitious load protection branch includes a protection circuit voltage output terminal, the protection circuit voltage output terminal and the field
Effect pipe（Q1）Grid connects, the voltage between the PV voltages positive input and PV voltage negative inputs（U1）It is more than
The rotection thresholds of setting（U3）When, the protection circuit voltage output terminal output signal makes the field-effect tube（Q1）Cut-off.
2. circuit is protected in the fictitious load according to claim 1 for photovoltaic DC-to-AC converter, it is characterised in that：The fictitious load
Access excision controlling brancher circuit includes first resistor（R2）, zener diode（D1）, triode（Q2）, second resistance（R5）With
3rd resistor（R6）, first resistor（R2）One end connect with PV voltage positive inputs, first resistor（R2）The other end with
Zener diode（D1）Cathode, triode（Q2）Collector connection, zener diode（D1）Anode and PV voltage negative senses
Input terminal connects, triode（Q2）Emitter connect with PV voltage negative inputs, triode（Q2）Base stage with second electricity
Resistance（R5）, 3rd resistor（R6）Connection, second resistance（R5）The other end connect with+5V power supplys, 3rd resistor（R6）It is another
End is connect with PV voltage negative inputs.
3. circuit is protected in the fictitious load according to claim 1 for photovoltaic DC-to-AC converter, it is characterised in that：The fictitious load
Branch is protected to include the 4th resistance（R3）, the 5th resistance（R4）With controllable accurate source of stable pressure（IC1）, the 4th resistance（R3）One end
It is connect with PV voltage positive inputs, the 4th resistance（R3）The other end and the 5th resistance（R4）, controllable accurate source of stable pressure（IC1）
Reference pole connection, the 5th resistance（R4）The other end connect with PV voltage negative inputs, controllable accurate source of stable pressure（IC1）'s
Anode is connect with PV voltage negative inputs, controllable accurate source of stable pressure（IC1）Cathode as protection circuit voltage output terminal with
Field-effect tube（Q1）Grid connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610766012.4A CN106207960B (en) | 2016-08-30 | 2016-08-30 | Circuit is protected for the fictitious load of photovoltaic DC-to-AC converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610766012.4A CN106207960B (en) | 2016-08-30 | 2016-08-30 | Circuit is protected for the fictitious load of photovoltaic DC-to-AC converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106207960A CN106207960A (en) | 2016-12-07 |
| CN106207960B true CN106207960B (en) | 2018-06-26 |
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ID=58089497
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610766012.4A Active CN106207960B (en) | 2016-08-30 | 2016-08-30 | Circuit is protected for the fictitious load of photovoltaic DC-to-AC converter |
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| Country | Link |
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| CN (1) | CN106207960B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103117535A (en) * | 2013-03-08 | 2013-05-22 | 无锡和晶科技股份有限公司 | Over-current protection self-locking circuit for photovoltaic inverter |
| CN203482088U (en) * | 2013-07-12 | 2014-03-12 | 南京国睿新能电子有限公司 | Dynamic dummy load of simple structure |
| CN104300773A (en) * | 2014-10-17 | 2015-01-21 | 深圳航天科技创新研究院 | Simple self-adaptation dummy-load circuit |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101414748B (en) * | 2007-10-19 | 2013-03-06 | 深圳迈瑞生物医疗电子股份有限公司 | Method for starting control circuit and protecting power supply control chip |
| CN103715713A (en) * | 2013-12-04 | 2014-04-09 | 苏州欧姆尼克新能源科技有限公司 | Method and apparatus for preventing repeated startup and shutdown of photovoltaic inverter auxiliary power supply |
| CN203851015U (en) * | 2014-05-06 | 2014-09-24 | 特变电工新疆新能源股份有限公司 | Circuit applied to photovoltaic grid connected inverter |
| CN206041459U (en) * | 2016-08-30 | 2017-03-22 | 苏州欧姆尼克新能源科技有限公司 | A false loads protection circuit for photovoltaic inverter |
-
2016
- 2016-08-30 CN CN201610766012.4A patent/CN106207960B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103117535A (en) * | 2013-03-08 | 2013-05-22 | 无锡和晶科技股份有限公司 | Over-current protection self-locking circuit for photovoltaic inverter |
| CN203482088U (en) * | 2013-07-12 | 2014-03-12 | 南京国睿新能电子有限公司 | Dynamic dummy load of simple structure |
| CN104300773A (en) * | 2014-10-17 | 2015-01-21 | 深圳航天科技创新研究院 | Simple self-adaptation dummy-load circuit |
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| Publication number | Publication date |
|---|---|
| CN106207960A (en) | 2016-12-07 |
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Effective date of registration: 20210125 Address after: 315700 No.25, group 7, Paitou village, Xizhou Town, Xiangshan County, Ningbo City, Zhejiang Province Patentee after: Wu Xu Address before: 215000 room 314, building A4, bio nano Park, 218 Xinghu street, Suzhou Industrial Park, Jiangsu Province Patentee before: OMNIK NEW ENERGY Co.,Ltd. |
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Effective date of registration: 20210209 Address after: 315700 No.57 jintongdao, Binhai Industrial Park, Xiangshan Economic Development Zone, Ningbo City, Zhejiang Province Patentee after: Jinlang Technology Co., Ltd Address before: 315700 No.25, group 7, Paitou village, Xizhou Town, Xiangshan County, Ningbo City, Zhejiang Province Patentee before: Wu Xu |