CN206041459U - A false loads protection circuit for photovoltaic inverter - Google Patents
A false loads protection circuit for photovoltaic inverter Download PDFInfo
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- CN206041459U CN206041459U CN201620996716.6U CN201620996716U CN206041459U CN 206041459 U CN206041459 U CN 206041459U CN 201620996716 U CN201620996716 U CN 201620996716U CN 206041459 U CN206041459 U CN 206041459U
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- voltage
- fictitious load
- resistance
- protection circuit
- branch road
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Abstract
The utility model provides a false loads protection circuit for photovoltaic inverter, including PV voltage positive going input end, PV voltage negative sense input, parallelly connected between PV voltage positive going input end and the PV voltage negative sense input have charging capacitor, fictitious load branch road, fictitious load to insert excision control branch road and false loads protection branch road. This vacation loads protection circuit is held in the positive going input of PV voltage, be equipped with false loads protection branch road between the PV voltage negative sense input, the protection circuit voltage output end of false loads protection branch road is connected with the field effect transistor grid, when voltage between PV voltage positive going input end and PV voltage negative sense input is greater than the protection threshold value of settlement, protection circuit voltage output end output signal makes field effect transistor end, amputate false load resistance from the circuit, so no matter whether power module normally works, can both effectively amputate the fictitious load, avoid the fictitious load to be burnt out, thereby reach the mesh of protection fictitious load.
Description
Technical field
This utility model is related to a kind of photovoltaic DC-to-AC converter, and more particularly to a kind of vacation used in photovoltaic DC-to-AC converter circuit is born
Carry protection circuit.
Background technology
With the day by day shortage of the energy and day by day increasing for environmental pollution, clean energy resource, regenerative resource become current
The field that countries in the world are given priority to, wherein photovoltaic power generation technology have the advantages that green, environmental protection, renewable increasingly receive because of which
To the attention and welcome of people.In photovoltaic power generation technology, the direct current energy for photovoltaic module is produced is converted to alternating current
The inverter of energy is the critical component of whole photovoltaic power generation technology.
In the inverter course of work, the PV ends of inverter circuit are connected with solar panel, are led in inverter circuit
One fictitious load can be often set for checking whether solar panel output voltage is stable, to prevent PV voltages from opening in power module
Near dynamic threshold value, fluctuation causes equipment frequent starting.Conventional inverter dummy load circuit is as shown in Figure 1, it is assumed that the input electricity of PV
Press as U1, the cut-in voltage of power module is U2, works as U1<During U2, power module 1 does not also start, and now audion Q2 is in
Cut-off state, then, by Zener diode D1 clampers in 15V, the conducting of field effect transistor Q1 is false for the grid A point current potentials of field effect transistor Q1
Load resistance R1 is tapped in loop.Work as U1>During U2, power module work produces+5V power supplys, acts on Q2 by resistance R5
Grid, turns on audion Q2, A point current potentials is dragged down, and ends field effect transistor Q1, dummy resistance R1 branch roads are disconnected.
There is certain defect in the connection for traditional fictitious load branch road above, as input voltage U1>During U2, sometimes because
The failure of power module causes+5V power supplys to disappear, and audion Q2 can thus ended always, and now A points current potential is 15V, is led
Cause dummy resistance R1 branch roads be removed, be connected on C1 two ends for a long time, so may result in fictitious load and burn.
Utility model content
The shortcoming of prior art in view of the above, the purpose of this utility model be provide it is a kind of can be to inverter
Fictitious load carries out the protection circuit of effective protection.
For achieving the above object and other related purposes, this utility model provides a kind of fictitious load for photovoltaic DC-to-AC converter
Protection circuit, including PV voltage positive inputs, PV voltage negative inputs, the PV voltages positive input, PV voltage negatives
Positive input, negative input to input and inverter power supply module is connected, the PV voltages positive input and PV
Charging capacitor, fictitious load branch road is parallel between voltage negative input, fictitious load accesses excision controlling brancher and fictitious load is protected
Shield branch road, the fictitious load branch road include dummy resistance and field effect transistor, and one end of dummy resistance is defeated with PV voltage forward directions
Enter end connection, the other end of dummy resistance is connected with the drain electrode of field effect transistor, and the source electrode of field effect transistor is defeated with PV voltage negative senses
Enter end connection；Fictitious load protection branch road includes a protection circuit voltage output end, the protection circuit voltage output end with
The fet gate connection, sets when the voltage between the PV voltages positive input and PV voltage negative inputs is more than
During fixed rotection thresholds, the protection circuit voltage output end output signal makes the field effect transistor cut-off.
Preferably, the fictitious load access excision controlling brancher circuit include first resistor, Zener diode, audion,
Second resistance and 3rd resistor, one end of first resistor are connected with PV voltage positive inputs, the other end of first resistor with it is steady
The colelctor electrode connection of the negative pole of pressure diode, audion, the positive pole of Zener diode are connected with PV voltage negative inputs, three poles
The emitter stage of pipe is connected with PV voltage negative inputs, and the base stage of audion is connected with second resistance, 3rd resistor, second resistance
The other end be connected with+5V power supplys, the other end of 3rd resistor is connected with PV voltage negative inputs.
Preferably, the fictitious load protection branch road includes the 4th resistance, the 5th resistance and controllable accurate source of stable pressure, and the 4th is electric
One end of resistance is connected with PV voltage positive inputs, the other end of the 4th resistance and the 5th resistance, the ginseng of controllable accurate source of stable pressure
Pole connection is examined, the other end of the 5th resistance is connected with PV voltage negative inputs, anode and the PV voltages of controllable accurate source of stable pressure
Negative input connects, and the negative electrode of controllable accurate source of stable pressure connects as the grid of protection circuit voltage output end and field effect transistor
Connect.
As described above, the fictitious load protection circuit for photovoltaic DC-to-AC converter of the present utility model has the advantages that：
The fictitious load protection circuit is provided with fictitious load protection branch road between PV voltage positive inputs, PV voltage negative inputs, false
The protection circuit voltage output end of load protection branch road is connected with fet gate, when PV voltages positive input and PV voltages
When voltage between negative input is more than the rotection thresholds for setting, protection circuit voltage output end output signal makes field effect transistor
Cut-off, dummy resistance is cut off from circuit, so no matter power module whether normal work, and fictitious load can be avoided to be burnt
Ruin, so as to reach the purpose of protection fictitious load.
Description of the drawings
Circuit diagrams of the Fig. 1 for conventional inverter dummy load circuit.
Circuit diagrams of the Fig. 2 for this utility model embodiment.
Specific embodiment
Embodiment of the present utility model is illustrated below by way of specific instantiation, those skilled in the art can be by this theory
Content disclosed by bright book understands other advantages of the present utility model and effect easily.This utility model can also be by addition
Different specific embodiments is carried out or applies, and the every details in this specification can also be based on different viewpoints and answer
With, without departing from it is of the present utility model spirit under carry out various modifications and changes.
Refer to Fig. 1,2.It should be noted that the diagram provided in the present embodiment only illustrates this practicality in a schematic way
New basic conception, only shows the component relevant with this utility model then rather than according to component during actual enforcement in schema
Number, shape and size are drawn, and during its actual enforcement, the kenel of each component, quantity and ratio can be a kind of random change, and
Its assembly layout kenel is likely to increasingly complex.
As shown in Fig. 2 this utility model provides a kind of fictitious load protection circuit for photovoltaic DC-to-AC converter, including PV voltages
Positive input PV-In+, PV voltage negative input PV-In-, PV voltage positive input PV-In+, PV voltage negative sense is input into
End PV-The positive input of in- and the power module 1 of inverter, negative input are connected, PV voltage positive input PV-in+、
PV voltage negative input PV-Charging capacitor C1, fictitious load branch road, fictitious load access excision controlling brancher is parallel between in-
Branch road is protected with fictitious load.Fictitious load branch road includes dummy resistance R1 and field effect transistor Q1, one end of dummy resistance R1 with
PV voltage positive input PV-In+ connects, and the other end of dummy resistance R1 is connected with the drain electrode of field effect transistor Q1, field effect
The source electrode of pipe Q1 and PV voltage negative input PV-In- connects.
Fictitious load protection branch road includes the 4th resistance R3, the 5th resistance R4 and controllable accurate source of stable pressure IC1, the 4th resistance R3
One end be connected with PV voltage positive inputs, the other end and the 5th resistance R4 of the 4th resistance R3, controllable accurate source of stable pressure IC1
The connection of reference pole, the other end of the 5th resistance R4 is connected with PV voltage negative inputs, the anode of controllable accurate source of stable pressure IC1
It is connected with PV voltage negative inputs, the negative electrode of controllable accurate source of stable pressure IC1 is used as protection circuit voltage output end 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 end output signal ends field effect transistor Q1.Controllable accurate source of stable pressure IC1 selects chip
TL431。
Fictitious load accesses excision controlling brancher circuit includes first resistor R2, Zener diode D1, audion Q2, second electric
Resistance R5 and 3rd resistor R6, one end of first resistor R2 are connected with PV voltage positive inputs, the other end of first resistor R2 and
The colelctor electrode connection of the negative pole of Zener diode D1, audion Q2, positive pole and the PV voltage negative inputs of Zener diode D1
Connection, the emitter stage of audion Q2 is connected with PV voltage negative inputs, the base stage of audion Q2 and second resistance R5, the 3rd electric
Resistance R6 connections, the other end of second resistance R5 are connected 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 with the addition of on the basis of original circuit by the 4th resistance R3, the 5th
The fictitious load protection branch road of resistance R4 and controllable accurate source of stable pressure IC1 compositions.Work as U1>During U3, B points current potential passes 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, turns on controllable accurate source of stable pressure IC1,
A point current potentials are dragged down, is ended field effect transistor Q1, fictitious load is cut off.So no matter whether power module work is normal, all can
A point current potentials are dragged down, fictitious load is cut off.So as to reach the purpose of protection fictitious load.
The fictitious load protection circuit is provided with fictitious load protection between PV voltage positive inputs, PV voltage negative inputs
Branch road, the protection circuit voltage output end of fictitious load protection branch road are connected with fet gate, when PV voltage positive inputs
During with the voltage between PV voltage negative inputs more than rotection thresholds U3 for setting, protection circuit voltage output end output signal
End field effect transistor, dummy resistance is cut off from circuit, so no matter power module whether normal work, can avoid
Fictitious load is burned out, so as to reach the purpose of protection fictitious load.So, this utility model effectively overcomes kind of the prior art
Plant shortcoming and have high industrial utilization.
Above-described embodiment only illustrative principle of the present utility model and its effect are new not for this practicality is limited
Type.Any person skilled in the art all can be carried out to above-described embodiment under without prejudice to spirit and the scope of the present utility model
Modifications and changes.Therefore, such as those of ordinary skill in the art without departing from the essence disclosed in this utility model
All equivalent modifications completed under god and technological thought or change, should be covered by claim of the present utility model.
Claims (3)
1. a kind of fictitious load protection circuit for photovoltaic DC-to-AC converter, is input into including PV voltage positive inputs, PV voltages negative sense
End, the positive input of the PV voltages positive input, PV voltages negative input and inverter power supply module, negative sense 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 road, fictitious load access excision controlling brancher and fictitious load protection branch road, the fictitious load branch road includes false negative
Carry resistance（R1）And field effect transistor（Q1）, dummy resistance（R1）One end be connected with PV voltage positive inputs, fictitious load electricity
Resistance（R1）The other end and field effect transistor（Q1）Drain electrode connection, field effect transistor（Q1）Source electrode and PV voltages negative input connect
Connect；The fictitious load protection branch road includes a protection circuit voltage output end, the protection circuit voltage output end 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 end output signal makes the field effect transistor（Q1）Cut-off.
2. the fictitious load protection circuit for photovoltaic DC-to-AC converter according to claim 1, it is characterised in that：The fictitious load
Accessing excision controlling brancher circuit includes first resistor（R2）, Zener diode（D1）, audion（Q2）, second resistance（R5）With
3rd resistor（R6）, first resistor（R2）One end be connected with PV voltage positive inputs, first resistor（R2）The other end with
Zener diode（D1）Negative pole, audion（Q2）Colelctor electrode connection, Zener diode（D1）Positive pole and PV voltage negative senses
Input connects, audion（Q2）Emitter stage be connected with PV voltage negative inputs, audion（Q2）Base stage it is electric with second
Resistance（R5）, 3rd resistor（R6）Connection, second resistance（R5）The other end be connected with+5V power supplys, 3rd resistor（R6）It is another
End is connected with PV voltage negative inputs.
3. the fictitious load protection circuit for photovoltaic DC-to-AC converter according to claim 1, it is characterised in that：The fictitious load
Protection branch road includes the 4th resistance（R3）, the 5th resistance（R4）With controllable accurate source of stable pressure（IC1）, the 4th resistance（R3）One end
It is connected 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 be connected with PV voltage negative inputs, controllable accurate source of stable pressure（IC1）'s
Anode is connected with PV voltage negative inputs, controllable accurate source of stable pressure（IC1）Negative electrode as protection circuit voltage output end with
Field effect transistor（Q1）Grid connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620996716.6U CN206041459U (en) | 2016-08-30 | 2016-08-30 | A false loads protection circuit for photovoltaic inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620996716.6U CN206041459U (en) | 2016-08-30 | 2016-08-30 | A false loads protection circuit for photovoltaic inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206041459U true CN206041459U (en) | 2017-03-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620996716.6U Withdrawn - After Issue CN206041459U (en) | 2016-08-30 | 2016-08-30 | A false loads protection circuit for photovoltaic inverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206041459U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106207960A (en) * | 2016-08-30 | 2016-12-07 | 苏州欧姆尼克新能源科技有限公司 | Fictitious load protection circuit for photovoltaic DC-to-AC converter |
-
2016
- 2016-08-30 CN CN201620996716.6U patent/CN206041459U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106207960A (en) * | 2016-08-30 | 2016-12-07 | 苏州欧姆尼克新能源科技有限公司 | Fictitious load protection circuit for photovoltaic DC-to-AC converter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170322 Effective date of abandoning: 20180626 |
|
| AV01 | Patent right actively abandoned |