CN202906447U - Inverter protection circuit - Google Patents
Inverter protection circuit Download PDFInfo
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- CN202906447U CN202906447U CN 201220379312 CN201220379312U CN202906447U CN 202906447 U CN202906447 U CN 202906447U CN 201220379312 CN201220379312 CN 201220379312 CN 201220379312 U CN201220379312 U CN 201220379312U CN 202906447 U CN202906447 U CN 202906447U
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Abstract
The utility model discloses an inverter protection circuit. The inverter protection circuit comprises multipath wire inlet voltages which are connected with an input terminal of the inverter respectively. A non-linear voltage detection circuit is arranged between positive and negative terminals of the each path of the wire inlet voltage. The non-linear voltage detection circuit comprises a first path and a second path which are connected in parallel. The first path is provided with a Zener diode, an indicating device and a backward diode which are connected in series, wherein a conduction direction of the backward diode is opposite to a breakdown direction of the Zener diode. The second path is provided with a bypass resistor. A breaker is arranged between the multipath wire inlet voltages and the inverter. The breaker possesses a control switch corresponding to any path of the voltage of the multipath wire inlet voltages.
Description
Technical field
Related to a kind of protection circuit of inverter in the utility model.
Background technology
At present, high-power inverter product dc terminal adopts the multichannel wire leading method more.In the actual installation process, easily produce the mutual wrong of direct current inlet wire or single channel and connect anti-situation.In this case, the start meeting causes damage to equipment and photovoltaic cell rashly.
For the accident that prevents from being caused by false wiring, the past mode that detects manually primary voltage with instrument during mainly with wiring judges that wiring corrects errors.Also have and adopt the method that the direct current primary voltage is detected, after wiring, first each road voltage is isolated respectively the sampling analog-to-digital conversion before the start, judge that by master control system its wiring corrects errors again.
Detect manually very inconvenience, and safety problem is arranged.Simultaneously, for the manual testing is provided point, need consider during the device structure design to expose or draw the end of incoming cables, not only cause trouble to structural design, and may reduce reliability and the fail safe of equipment.
Method for increasing the aanalogvoltage sample circuit is difficult for addressing the problem.
Take two-way inlet wire wrong as example, as shown in Figure 1a, PV1 PV2 represents respectively the photovoltaic battery panel module, and V1, V2 are end of incoming cables voltage, and circuit breaker is not in off-state before the start.Under normal circumstances, measure the open circuit voltage that V1, V2 can get PV1, PV2, and PV1, PV2 open circuit voltage are basic identical.
In installation, very easily produce Fig. 1 b false wiring form.Detect V1, the voltage of V2, the input circuit of sample circuit must be connected on the two ends of V1, V2, produces so have the loop, in the situation that sample circuit is similar, the magnitude of voltage that V1, V2 record can be close to normal voltage, the erroneous judgement wiring is correct.If the method that adopts timesharing to be sampled successively in every road, then need to increase the more control elements such as circuit breaker (each road needs an independent breaker control circuit at least), increased system complexity, not only reliability is not easy to be guaranteed, and has also increased cost.
Summary of the invention
The utility model provides a kind of protection circuit of inverter, and the circuit breaker front end in each end of incoming cables accesses this kind circuit, can be by the analog quantity of the direct or indirect output of each testing circuit or the wiring correctness of amount of logic judgement end of incoming cables.
The utility model discloses a kind of protection circuit of inverter; it comprises the primary voltage that multichannel links to each other with the input of inverter respectively; between the positive and negative terminal of every road primary voltage, be provided with a non-linear voltage testing circuit; described non-linear voltage testing circuit comprises the first via and the second tunnel parallel with one another; be provided with the backward diode that Zener diode, indicating device and a conducting direction of mutual series connection and Zener diode puncture opposite direction on the described first via, be provided with bypass resistance on described the second the tunnel.
Preferably, be provided with a circuit breaker on the output of multichannel primary voltage, this circuit breaker has a way control switch corresponding with arbitrary road of described multichannel primary voltage.
Preferably, also be provided with current-limiting resistance on the described first via.
Preferably, described indicating device is the indicating circuit by Current Control.
Preferably, the indicating circuit of described Current Control can comprise one or more in LED lamp, light-coupled isolation output or the calutron isolation output.
The utility model adopts above structure, if any X road wrong, then can form loop shown in Figure 3.At this moment, all voltage detecting circuits are in series connection, because different parameter designing, nonlinear variation can occur owing to difference each other in their voltage detecting input equiva lent impedance, produce larger difference, cause the voltage at each testing circuit two ends to produce larger difference, so that final output signal is different, by analyzing output signal, can judge easily wiring error.Simultaneously, also can determine to make mistakes a little.
Description of drawings
Accompanying drawing 1a is connection type under normal circumstances.
Accompanying drawing 1b is the connection type under the error situation.
Accompanying drawing 2 is the utility model structure and installation site schematic diagram (expression is installed in before end of incoming cables circuit breaker or the isolating switch).
Accompanying drawing 3 is the equivalent circuit structure schematic diagram that the utility model forms with photovoltaic battery panel under the inlet wire wrong state of a few roads (altogether X road).
Accompanying drawing 4 is a kind of structural representation of non-linear voltage testing circuit in the utility model.
Embodiment
Below in conjunction with accompanying drawing preferred embodiment of the present utility model is described in detail, thereby so that advantage of the present utility model and feature can be easier to be it will be appreciated by those skilled in the art that protection range of the present utility model is made more explicit defining.
The first embodiment of the present utility model; a kind of protection circuit of inverter; it comprises the primary voltage that multichannel links to each other with the input of inverter respectively; between the positive and negative terminal of every road primary voltage, be provided with a non-linear voltage testing circuit; the non-linear voltage testing circuit comprises the first via and the second tunnel parallel with one another; be provided with the Zener diode Z of mutual series connection on the first via; indicating device and a conducting direction and Zener diode Z puncture the backward diode D of opposite direction; be provided with bypass resistance R2 on the second the tunnel; bypass resistance can be configured to infinity in some cases, and namely the R2 position directly disconnects.
Indicating device can be various indicating circuits by Current Control, other various components and parts that have logic judging function or by analog quantity the operating state of inverter is judged such as LED lamp, optical coupled switch, calutron isolation output.In the present embodiment, indicating device is the LED lamp that is connected between Zener diode Z and the backward diode D.
Under normal condition, each road primary voltage is isolated mutually, not coupling between each testing circuit, and the positive and negative terminal of inverter is by Zener diode Z, and so that the LED lamp is bright and provide normal index signal.
When the positive and negative terminal phase mutual connection inverse time of inverter, the positive and negative terminal of inverter can not pass through backward diode D conducting, so that the LED lamp extinguishes and provides unusual index signal.If this moment, inverter is opened rashly, and backward diode D plays the effect of reverse protection to whole circuit.
When negative terminal or the positive anode phase mutual connection inverse time of the two-way of inverter or multichannel primary voltage, as shown in Figure 3, primary voltage be separately positioned on it on mutually connect.At this moment, all voltage detecting circuits are in series connection, because different parameter designing, their voltage detecting input equiva lent impedance can nonlinear variation occur owing to difference each other, produce larger difference, cause the voltage at each testing circuit two ends to produce larger difference.When the voltage of both sides in the non-linear voltage testing circuit of arbitrary road does not reach the puncture voltage of Zener diode Z, it is infinitely great that the resistance of Zener diode Z will become, so that electric current passes from bypass resistance R2, cause the LED lamp to extinguish, the output signal of indicating device is different, by analyzing output signal, can judge easily wiring error.Simultaneously, also can determine to make mistakes a little.
Among the second embodiment of the present utility model, be that the output of multichannel primary voltage is provided with a circuit breaker between multichannel primary voltage and described inverter, this circuit breaker has a way control switch corresponding with arbitrary road of described multichannel primary voltage.Because each circuit is independent respectively, can control use or remove all voltage detecting circuits by the control switch of simple circuit breaker, having 4 road primary voltages such as an inverter just only needs a disjunction with breaker control inversion of 4 way control switch to get final product, and this can significantly reduce unwanted losses.
Among the 3rd embodiment of the present utility model, current-limiting resistance R1 series connection is arranged in the first circuit, plays the effect of current limliting dividing potential drop.The resistance of current-limiting resistance R1 should be less than the resistance of bypass resistance R2.The value of R1 and R2 has suitable difference, should be according to actual requirement such as primary voltage grade, and Zener diode selection etc. is configured.
The utility model adopts above structure, has the following advantages:
(1) cost is lower, and circuit realizes that easily the reliability of circuit own is high.
(2) decision logic is simple, can be easy to judge multichannel wiring error, can judge wrong position simultaneously, and the convenient construction personnel revise.
(3) can change according to actual needs the circuit output signal form, have good autgmentability and transplantability.
Above specific embodiment of the present utility model is illustrated in conjunction with diagram, clearly on the basis of not leaving scope and spirit of the present utility model, can much revise prior art and technique.In the technical field, the common knowledge of a GPRS just can in technology main idea scope of the present utility model, be carried out diversified change under of the present utility model.
Claims (5)
1. protection circuit of inverter; it is characterized in that: it comprises the primary voltage that multichannel links to each other with the input of inverter respectively; between the positive and negative terminal of every road primary voltage, be provided with a non-linear voltage testing circuit; described non-linear voltage testing circuit comprises the first via and the second tunnel parallel with one another; be provided with the backward diode that Zener diode, indicating device and a conducting direction of mutual series connection and Zener diode puncture opposite direction on the described first via, be provided with bypass resistance on described the second the tunnel.
2. protection circuit of inverter according to claim 1, it is characterized in that: be provided with a circuit breaker on the output of multichannel primary voltage, this circuit breaker has a way control switch corresponding with arbitrary road of described multichannel primary voltage.
3. protection circuit of inverter according to claim 1 is characterized in that: also be provided with current-limiting resistance on the described first via.
4. it is characterized in that according to claim 1 or 3 described protection circuit of inverters: described indicating device is the indicating circuit by Current Control.
5. protection circuit of inverter according to claim 4 is characterized in that: the indicating circuit of described Current Control can comprise one or more in LED lamp, light-coupled isolation output or the calutron isolation output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220379312 CN202906447U (en) | 2012-08-02 | 2012-08-02 | Inverter protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220379312 CN202906447U (en) | 2012-08-02 | 2012-08-02 | Inverter protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202906447U true CN202906447U (en) | 2013-04-24 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220379312 Expired - Fee Related CN202906447U (en) | 2012-08-02 | 2012-08-02 | Inverter protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202906447U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102798793A (en) * | 2012-08-02 | 2012-11-28 | 江苏兆伏新能源有限公司 | Inverter protective circuit |
| WO2016000658A1 (en) * | 2014-07-04 | 2016-01-07 | 珠海格力电器股份有限公司 | Protection circuit for photovoltaic inverter |
-
2012
- 2012-08-02 CN CN 201220379312 patent/CN202906447U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102798793A (en) * | 2012-08-02 | 2012-11-28 | 江苏兆伏新能源有限公司 | Inverter protective circuit |
| CN102798793B (en) * | 2012-08-02 | 2014-11-05 | 江苏兆伏新能源有限公司 | Inverter protective circuit |
| WO2016000658A1 (en) * | 2014-07-04 | 2016-01-07 | 珠海格力电器股份有限公司 | Protection circuit for photovoltaic inverter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130424 Termination date: 20150802 |
|
| EXPY | Termination of patent right or utility model |