CN204243753U - A kind of anti-reverse card of bus and grid-connected electric equipment system - Google Patents
A kind of anti-reverse card of bus and grid-connected electric equipment system Download PDFInfo
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- CN204243753U CN204243753U CN201420748450.4U CN201420748450U CN204243753U CN 204243753 U CN204243753 U CN 204243753U CN 201420748450 U CN201420748450 U CN 201420748450U CN 204243753 U CN204243753 U CN 204243753U
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Abstract
The utility model provides the anti-reverse card of a kind of bus, the anti-reverse card of this bus comprises the first power switch, the second power switch, voltage detecting circuit, the first positive binding post, the second positive binding post, the first negative binding post and the second negative binding post, wherein: binding post positive with described first and the described second positive binding post are connected respectively at the two ends of described first power switch; The two ends of described second power switch are connected with described first negative binding post and described second negative binding post respectively; Described voltage detecting circuit, when the polarity of voltage detected and predeterminated voltage polarity are not identical, makes described first power switch and described second power switch disconnect.The utility model additionally provides a kind of grid-connected electric equipment system.The utility model wiring is simple, and when can effectively prevent the grid-connected electric equipment containing uncontrollable rectifier bridge circuit in parallel, bus connects the aircraft bombing risk instead, has expanded range of application, without the need to extra radiator, with low cost.
Description
Technical field
The utility model relates to circuit protection technical field, more particularly, relates to the anti-reverse card of a kind of bus and grid-connected electric equipment system.
Background technology
Under a lot of application scenario, need to carry out parallel connection between the grid-connected electric equipment bus containing uncontrollable rectifier bridge circuit, such as use AFE (Active Front End, Active Front End) and frequency converter composition four-quadrant system, or combining inverter is in parallel, wherein, as Fig. 1 shows, for using the wiring schematic diagram of AFE and frequency converter composition four-quadrant system.If reverse polarity connection when bus is in parallel between equipment, has at least the fly-wheel diode of an equipment that overcurrent can occur and burns, cause aircraft bombing.
At present, for taking precautions against this risk, a kind of relatively conventional method is all Series power diode on positive and negative busbar, the flow direction of Limited Current.
But in above-mentioned common method, due to the unilateral conduction of diode, electric current can only by rear class to electrical network feedback, and equipment can only work in two quadrants, greatly limit its range of application; In addition, during rear class energy feedback, feedback current, all by power diode on positive and negative busbar, because diode exists forward conduction voltage drop, will produce loss when flowing through electric current.In order to avoid, diode temperature is too high exceedes self restriction, and being necessary for it increases extra heat abstractor, increases machine volume and cost.
Utility model content
The technical problems to be solved in the utility model is, loss is produced during equal Series power diode on positive and negative busbar in prior art, and need, for it increases extra heat abstractor, to add machine volume and cost, the anti-reverse card of a kind of bus and grid-connected electric equipment system are provided.
The technical solution of the utility model is to provide the anti-reverse card of a kind of bus, it is characterized in that, the anti-reverse card of this bus comprises the first power switch, the second power switch, voltage detecting circuit, the first positive binding post, the second positive binding post, the first negative binding post and the second negative binding post, wherein: binding post positive with described first and the described second positive binding post are connected respectively at the two ends of described first power switch; The two ends of described second power switch are connected with described first negative binding post and described second negative binding post respectively; The input of described voltage detecting circuit binding post positive with described first, the second positive binding post, the first negative binding post and the second negative binding post is connected, output is connected with the control port of described first power switch, the control port of the second power switch respectively respectively, and when the detect described first positive binding post, the second positive binding post, the first negative binding post are not identical with predeterminated voltage polarity with the polarity of voltage of the second negative binding post, described first power switch and described second power switch are disconnected.
In the anti-reverse card of above-mentioned bus, the described first positive binding post is connected positive bus-bar outward with the described second positive binding post, and described first negative binding post is connected negative busbar outward with described second negative binding post.
The utility model additionally provides a kind of grid-connected electric equipment system, it is characterized in that, this grid-connected electric equipment system comprises the first equipment, the second equipment and the anti-reverse card of bus, wherein: the anti-reverse card of this bus comprises the first power switch, the second power switch, voltage detecting circuit, the first positive binding post, the second positive binding post, the first negative binding post and the second negative binding post; Binding post positive with described first and the described second positive binding post are connected respectively at the two ends of described first power switch; The two ends of described second power switch are connected with described first negative binding post and described second negative binding post respectively; The input of described voltage detecting circuit is connected with the described first positive binding post, the second positive binding post, the first negative binding post and the second negative binding post, and the output of described voltage detecting circuit is connected with the control port of described first power switch and the control port of the second power switch respectively; Described voltage detecting circuit, when the polarity of voltage detected and predeterminated voltage polarity are not identical, makes described first power switch and described second power switch disconnect.
In above-mentioned grid-connected electric equipment system, described first equipment and described second equipment are all containing uncontrollable rectifier bridge circuit, the positive bus-bar of described first equipment is connected with the described first positive binding post, and the negative busbar of described first equipment is connected with described first negative binding post; The positive bus-bar of described second equipment is connected with the described second positive binding post, and the negative busbar of described second equipment is connected with described second negative binding post.
The beneficial effects of the utility model have: wiring is simple, and when can effectively prevent the grid-connected electric equipment containing uncontrollable rectifier bridge circuit in parallel, bus connects the aircraft bombing risk instead, has expanded range of application, without the need to extra radiator, with low cost.
Accompanying drawing explanation
Fig. 1 is existing AFE and frequency converter wiring schematic diagram.
Fig. 2 is the schematic diagram of the anti-reverse card of bus of the utility model embodiment.
Fig. 3 is the schematic diagram of the grid-connected electric equipment system of the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
As shown in Figure 2, it is the schematic diagram of the anti-reverse card of bus of the utility model embodiment, in the present embodiment, the anti-reverse card of this bus 1 comprises the first power switch K1, the second power switch K2, the positive binding post of the positive binding post of voltage detecting circuit 10, first 11, second 12, first negative binding post 13 and the second negative binding post 14, wherein, the two ends of the first power switch K1 respectively binding post 11 positive with first and the second positive binding post 12 are connected, and binding post 13 negative with first and the second negative binding post 14 are connected respectively at the two ends of the second power switch K2; The input of the voltage detecting circuit 10 respectively negative binding post 13 of the positive binding post of binding post 11, second positive with first 12, first and the second negative binding post 14 is connected, and the output of voltage detecting circuit 10 is connected with the control port 15 of the first power switch K1 and the control port 16 of the second power switch K2 respectively.
In the present embodiment, the first positive binding post 11 is connected outward with the positive and negative busbar of an equipment respectively with the first negative binding post 13, and the second positive binding post 12 is connected outward with the positive and negative busbar of another equipment respectively with the second negative binding post 14.
Voltage detecting circuit 10 is detecting that the polarity of voltage that the polarity of voltage of the bus treating equipment in parallel and bus anti-reverse card 1 upper connecting terminal marks is consistent, namely the first positive binding post 11 is detected, first negative binding post 13, the polarity of voltage of the second positive binding post 12 and the second negative binding post 14 is with when presetting consistent, closed first power switch K1, second power switch K2, and when voltage detecting circuit 10 detects that the polarity of the polarity of voltage of bus and bus anti-reverse card 1 upper connecting terminal is contrary or bus anti-reverse card 1 upper connecting terminal does not access, disconnect the first power switch K1 and the second power switch K2, make to remain open state between equipment in parallel, now, no current flows through from bus, and then eliminate the risk of aircraft bombing.
As shown in Figure 3, be the schematic diagram of grid-connected electric equipment system of the utility model embodiment.This grid-connected electric equipment system comprises the anti-reverse card 1 of the first device A, the second equipment B and bus, wherein, first device A and the second equipment B are all containing uncontrollable rectifier bridge circuit, the positive bus-bar of the first device A is connected with the first positive binding post 11, the negative busbar of the first device A is connected with the first negative binding post 13, the positive bus-bar of the second equipment B is connected with the second positive binding post 12, and the negative busbar of the second equipment B is connected with the second negative binding post 14.
In the present embodiment, voltage detecting circuit 10 is detecting when the polarity of voltage of the bus of equipment in parallel is consistent with the polarity of voltage that bus anti-reverse card 1 upper connecting terminal marks, first power switch K1 and the second power switch K2 is kept closed, first device A and the second equipment B keep connected state, and system can normally work; When voltage detecting circuit 10 detects that the polarity of the polarity of voltage of bus and bus anti-reverse card 1 upper connecting terminal is contrary, first power switch K1 and the second power switch K2 disconnects, make to remain open state between the first device A and the second equipment B, now, no current flows through from bus, and then eliminates the risk of aircraft bombing.
Implement the anti-reverse card of bus of the present utility model and grid-connected electric equipment system, beneficial effect has: wiring is simple, when can effectively prevent the grid-connected electric equipment containing uncontrollable rectifier bridge circuit in parallel, bus connects the aircraft bombing risk instead, expand range of application, without the need to extra radiator, with low cost.
The above; be only the utility model preferably embodiment; but protection range of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection range of the present utility model.Therefore, protection range of the present utility model should be as the criterion with the protection range of claim.
Claims (4)
1. the anti-reverse card of bus, it is characterized in that, the anti-reverse card of this bus comprises the first power switch (K1), the second power switch (K2), voltage detecting circuit (10), the first positive binding post (11), the second positive binding post (12), the first negative binding post (13) and the second negative binding post (14), wherein: binding post (11) positive with described first and the described second positive binding post (12) are connected respectively at the two ends of described first power switch (K1), the two ends of described second power switch (K2) are connected with described first negative binding post (13) and described second negative binding post (14) respectively, the input positive binding post (11) with described first respectively of described voltage detecting circuit (10), second positive binding post (12), first negative binding post (13) is connected with the second negative binding post (14), output is connected with the control port (15) of described first power switch (K1) and the control port (16) of the second power switch (K2) respectively, and the detect described first positive binding post (11), second positive binding post (12), when first negative binding post (13) is not identical with predeterminated voltage polarity with the polarity of voltage of the second negative binding post (14), described first power switch (K1) and described second power switch (K2) are disconnected.
2. according to the anti-reverse card of the bus described in claim 1, it is characterized in that, described first positive binding post (11) is connected positive bus-bar outward with the described second positive binding post (12), and described first negative binding post (13) is connected negative busbar outward with described second negative binding post (14).
3. a grid-connected electric equipment system, it is characterized in that, this grid-connected electric equipment system comprises the first equipment (A), the second equipment (B) and the anti-reverse card of bus (1), wherein: the anti-reverse card of this bus (1) comprises the first power switch (K1), the second power switch (K2), voltage detecting circuit (10), the first positive binding post (11), the second positive binding post (12), the first negative binding post (13) and the second negative binding post (14); Binding post (11) positive with described first and the described second positive binding post (12) are connected respectively at the two ends of described first power switch (K1); The two ends of described second power switch (K2) are connected with described first negative binding post (13) and described second negative binding post (14) respectively; The input of described voltage detecting circuit (10) is connected with the described first positive binding post (11), the second positive binding post (12), the first negative binding post (13) and the second negative binding post (14), and the output of described voltage detecting circuit (10) is connected with the control port (15) of described first power switch (K1), the control port (16) of the second power switch (K2) respectively; Described voltage detecting circuit (10), when the polarity of voltage detected and predeterminated voltage polarity are not identical, makes described first power switch (K1) and described second power switch (K2) disconnect.
4. grid-connected electric equipment system according to claim 3, it is characterized in that, described first equipment (A) and described second equipment (B) are all containing uncontrollable rectifier bridge circuit, the positive bus-bar of described first equipment (A) is connected with the described first positive binding post (11), and the negative busbar of described first equipment (A) is connected with described first negative binding post (13); The positive bus-bar of described second equipment (B) is connected with the described second positive binding post (12), and the negative busbar of described second equipment (B) is connected with described second negative binding post (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420748450.4U CN204243753U (en) | 2014-12-02 | 2014-12-02 | A kind of anti-reverse card of bus and grid-connected electric equipment system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420748450.4U CN204243753U (en) | 2014-12-02 | 2014-12-02 | A kind of anti-reverse card of bus and grid-connected electric equipment system |
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| CN204243753U true CN204243753U (en) | 2015-04-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109950879A (en) * | 2019-02-28 | 2019-06-28 | 珠海格力电器股份有限公司 | Charging protection device and method for power utilization circuit and circuit with charging protection function |
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2014
- 2014-12-02 CN CN201420748450.4U patent/CN204243753U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109950879A (en) * | 2019-02-28 | 2019-06-28 | 珠海格力电器股份有限公司 | Charging protection device and method for power utilization circuit and circuit with charging protection function |
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