CN204119017U - A kind of soft start protective circuit for charging device - Google Patents
A kind of soft start protective circuit for charging device Download PDFInfo
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- CN204119017U CN204119017U CN201420401674.8U CN201420401674U CN204119017U CN 204119017 U CN204119017 U CN 204119017U CN 201420401674 U CN201420401674 U CN 201420401674U CN 204119017 U CN204119017 U CN 204119017U
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Abstract
The utility model relates to a kind of soft start protective circuit for charging device, for Anti-surging shock resistance, comprises ac input circuit, rectified three-phase circuit, the first soft starting circuit and direct current output loop; The output of ac input circuit connects the input of rectified three-phase circuit, be connected the first soft starting circuit between rectified three-phase circuit with direct current output loop, ac input circuit comprises the second soft starting circuit, the 3rd soft starting circuit, the first fuse, the second fuse and relay voltage sample loop; The A cross streams input of the second soft starting circuit connects the B cross streams input of the 3rd soft starting circuit by relay voltage sample loop; The output of the second soft starting circuit connects the first input end of rectified three-phase circuit by the first fuse; The output of the 3rd soft starting circuit connects the second input of rectified three-phase circuit and the public connecting end of the 3rd input by the second fuse; 3rd input of rectified three-phase circuit is C cross streams input.
Description
Technical field
The utility model relates to direct current or the ac input power switch technology field to surge power output, especially a kind of soft start protective circuit for charging device.
Background technology
In existing charging device; the object reaching smooth steady is exported in order to make direct current; usually the mode adding input filter capacitor and output filter capacitor in circuit can be adopted, when input circuit and output circuit are when working beginning, all larger surge current can be produced.Because switching tube is larger than output current during normal operation when starting, so be easy to during this time suffer damage.Present stage, domestic like product is all the direct current output loop after rectification adds soft starting circuit, to realize the effect of buffer switch pipe inrush current.But, when power supply input switch connects moment, also often have the ac input end that high voltage surge invades power supply, sizable impact caused to input insurance and full-bridge rectification bridge, rectifier bridge seriously even can be made to puncture.In this case, whole circuit extremely easily suffers damage.
Utility model content
The utility model provides a kind of soft start protective circuit for charging device, and technical problem to be solved is that ac input circuit connects the problem damaging whole circuit instantaneously because the impact by high voltage surge at power supply input switch.
The technical scheme that the utility model solves the problems of the technologies described above is as follows: a kind of soft start protective circuit for charging device, comprises ac input circuit, rectified three-phase circuit, the first soft starting circuit and direct current output loop; The output of described ac input circuit is connected with the input of described rectified three-phase circuit, the high voltage direct current positive output end of described rectified three-phase circuit connects an input of described direct current output loop by described first soft starting circuit, the high voltage direct current negative output terminal of described rectified three-phase circuit directly connects another input of described direct current output loop; Described ac input circuit comprises the second soft starting circuit, the 3rd soft starting circuit, the first fuse, the second fuse and relay voltage sample loop; The A cross streams input of described second soft starting circuit is connected with the B cross streams input of described 3rd soft starting circuit by described relay voltage sample loop; The output of described second soft starting circuit connects the first input end of described rectified three-phase circuit by described first fuse; The output of described 3rd soft starting circuit connects the second input of described rectified three-phase circuit and the public connecting end of the 3rd input by described second fuse; 3rd input of described rectified three-phase circuit is also C cross streams input.
The beneficial effects of the utility model are: the utility model except increasing except soft starting circuit on direct current output loop; on ac input circuit; also add soft starting circuit simultaneously; double protection functions is played to module input; greatly achieve the high reliability of product, ensure that the safe handling of power supply.
On the basis of technique scheme, the utility model can also do following improvement.
Further, described first soft starting circuit comprises the first relay and the first resistance, the coil-end access 12V voltage of described first relay, one end of first normally opened contact of described first relay connects the high voltage direct current positive output end of described rectified three-phase circuit, and the other end connects an input of described direct current output loop; Described first resistor coupled in parallel is in the two ends of described first normally opened contact.
Further, described second soft starting circuit comprises the second relay and the second resistance, the coil-end access 12V voltage of described second relay, one end of the second normally opened contact of described second relay is described A cross streams input, and the other end connects one end of described first fuse; Described second resistor coupled in parallel is in the two ends of described second normally opened contact.
Further, described 3rd soft starting circuit comprises the 3rd relay and the 3rd resistance, the coil-end access 12V voltage of described 3rd relay, one end of the 3rd normally opened contact of described 3rd relay is described B cross streams input, and the other end connects one end of described second fuse; Described 3rd resistor coupled in parallel is in the two ends of described 3rd normally opened contact.
Accompanying drawing explanation
Fig. 1 is the general structure schematic diagram of the utility model soft start protective circuit.
In accompanying drawing, the list of parts representated by each label is as follows:
Fu1, the first fuse, Fu2, the second fuse, AC1, A cross streams input, AC2, B cross streams input, AC3, C cross streams input, K1, the first relay, K2, the second relay, K3, the 3rd relay, Ka1, the first normally opened contact, Ka2, the second normally opened contact, Ka3, the 3rd normally opened contact, R1, the first resistance, R2, the second resistance, R3, the 3rd resistance.
Embodiment
Be described principle of the present utility model and feature below in conjunction with accompanying drawing, example, only for explaining the utility model, is not intended to limit scope of the present utility model.
As shown in Figure 1, a kind of soft start protective circuit for charging device, comprises ac input circuit, rectified three-phase circuit, the first soft starting circuit and direct current output loop; The output of described ac input circuit is connected with the input of described rectified three-phase circuit, the high voltage direct current positive output end of described rectified three-phase circuit connects an input of described direct current output loop by described first soft starting circuit, the high voltage direct current negative output terminal of described rectified three-phase circuit directly connects another input of described direct current output loop, and described ac input circuit comprises the second soft starting circuit, the 3rd soft starting circuit, the first fuse Fu1, the second fuse Fu2 and relay voltage sample loop; The A cross streams input AC1 of described second soft starting circuit is connected with the B cross streams input AC2 of described 3rd soft starting circuit by described relay voltage sample loop; The output of described second soft starting circuit connects the first input end of described rectified three-phase circuit by described first fuse Fu1; The output of described 3rd soft starting circuit connects the second input of described rectified three-phase circuit and the public connecting end of the 3rd input by described second fuse Fu2; 3rd input of described rectified three-phase circuit is also C cross streams input AC3.
Described ac input circuit is the input circuit of AC module, for connecting the loop of three-phase alternating current input power.
Described rectified three-phase circuit is used for carrying out rectification to three-phase alternating current input power.
Described first soft starting circuit is used for buffer switch pipe inrush current.
Described direct current output loop is for exporting DC power supply.
Described first soft starting circuit comprises the first relay K 1 and the first resistance R1, the coil-end access 12V voltage of described first relay K 1, one end of first normally opened contact Ka1 of described first relay K 1 connects the high voltage direct current positive output end of described rectified three-phase circuit, and the other end connects an input of described direct current output loop; Described first resistance R1 is parallel to the two ends of described first normally opened contact Ka1.
Described second soft starting circuit comprises the second relay K 2 and the second resistance R2, the coil-end access 12V voltage of described second relay K 2, one end of second normally opened contact Ka2 of described second relay K 2 is A cross streams input AC1, and the other end connects one end of described first fuse Fu1; Described second resistance R2 is parallel to the two ends of described second normally opened contact Ka2.
Described 3rd soft starting circuit comprises the 3rd relay K 3 and the 3rd resistance R3, the coil-end access 12V voltage of described 3rd relay K 3, one end of 3rd normally opened contact Ka3 of described 3rd relay K 3 is B cross streams input AC2, and the other end connects one end of described second fuse Fu2; Described 3rd resistance R3 is parallel to the two ends of described 3rd normally opened contact Ka3.
First resistance R1 of the present utility model, the second resistance R2, the 3rd resistance R3 are current-limiting resistance.After the power supply of circuit is connected, input voltage provides current path by the second resistance R2 and the 3rd resistance R3, through the second resistance R2, the 3rd resistance R3, the sampling capacitor in relay voltage sample loop is charged simultaneously, along with the continuation of the process of charging, when the voltage sampling of the charging voltage on sampling capacitor through relay voltage sample loop compares, when reaching the operation voltage of relay, second relay K 2 and the 3rd relay K 3 action, the second normally opened contact Ka2 and the 3rd normally opened contact Ka3 closes; Second resistance R2 and the 3rd resistance R3 carries out bypass current limliting; ensure that power supply normal reliable ground runs; thus the impulse current reached when restriction starts; the full-bridge rectification bridge of the first fuse Fu1, the second fuse Fu2 and rectified three-phase circuit is played a protective role; make switching process loss greatly reduce simultaneously, drastically increase the performance of module further.
By also proving the experiment repeatedly of surge generator, it is inadequate for only in DC circuit, increasing soft start, only increases soft starting circuit at direct current output loop and ac input circuit simultaneously, just can guarantee the safe handling of power supply.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.
Claims (4)
1., for a soft start protective circuit for charging device, comprise ac input circuit, rectified three-phase circuit, the first soft starting circuit and direct current output loop; The output of described ac input circuit is connected with the input of described rectified three-phase circuit, the high voltage direct current positive output end of described rectified three-phase circuit connects an input of described direct current output loop by described first soft starting circuit, the high voltage direct current negative output terminal of described rectified three-phase circuit directly connects another input of described direct current output loop, it is characterized in that, described ac input circuit comprises the second soft starting circuit, the 3rd soft starting circuit, the first fuse Fu1, the second fuse Fu2 and relay voltage sample loop; The A cross streams input AC1 of described second soft starting circuit is connected with the B cross streams input AC2 of described 3rd soft starting circuit by described relay voltage sample loop; The output of described second soft starting circuit connects the first input end of described rectified three-phase circuit by described first fuse Fu1; The output of described 3rd soft starting circuit connects the second input of described rectified three-phase circuit and the public connecting end of the 3rd input by described second fuse Fu2; 3rd input of described rectified three-phase circuit is also C cross streams input AC3.
2. a kind of soft start protective circuit for charging device according to claim 1, it is characterized in that, described first soft starting circuit comprises the first relay K 1 and the first resistance R1, the coil-end access 12V voltage of described first relay K 1, one end of first normally opened contact Ka1 of described first relay K 1 connects the high voltage direct current positive output end of described rectified three-phase circuit, and the other end connects an input of described direct current output loop; Described first resistance R1 is parallel to the two ends of described first normally opened contact Ka1.
3. a kind of soft start protective circuit for charging device according to claim 1, it is characterized in that, described second soft starting circuit comprises the second relay K 2 and the second resistance R2, the coil-end access 12V voltage of described second relay K 2, one end of second normally opened contact Ka2 of described second relay K 2 is described A cross streams input AC1, and the other end connects one end of described first fuse Fu1; Described second resistance R2 is parallel to the two ends of described second normally opened contact Ka2.
4. a kind of soft start protective circuit for charging device according to claim 1, it is characterized in that, described 3rd soft starting circuit comprises the 3rd relay K 3 and the 3rd resistance R3, the coil-end access 12V voltage of described 3rd relay K 3, one end of 3rd normally opened contact Ka3 of described 3rd relay K 3 is described B cross streams input AC2, and the other end connects one end of described second fuse Fu2; Described 3rd resistance R3 is parallel to the two ends of described 3rd normally opened contact Ka3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420401674.8U CN204119017U (en) | 2014-07-18 | 2014-07-18 | A kind of soft start protective circuit for charging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420401674.8U CN204119017U (en) | 2014-07-18 | 2014-07-18 | A kind of soft start protective circuit for charging device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204119017U true CN204119017U (en) | 2015-01-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420401674.8U Expired - Fee Related CN204119017U (en) | 2014-07-18 | 2014-07-18 | A kind of soft start protective circuit for charging device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204119017U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105471280A (en) * | 2015-12-30 | 2016-04-06 | 深圳市合信自动化技术有限公司 | Device and method for protecting soft start failure of AC/DC/AC driver |
| CN112956098A (en) * | 2020-07-15 | 2021-06-11 | 深圳欣锐科技股份有限公司 | Isolation circuit and isolation method |
-
2014
- 2014-07-18 CN CN201420401674.8U patent/CN204119017U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105471280A (en) * | 2015-12-30 | 2016-04-06 | 深圳市合信自动化技术有限公司 | Device and method for protecting soft start failure of AC/DC/AC driver |
| CN112956098A (en) * | 2020-07-15 | 2021-06-11 | 深圳欣锐科技股份有限公司 | Isolation circuit and isolation method |
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| 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: 20150121 Termination date: 20180718 |
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| CF01 | Termination of patent right due to non-payment of annual fee |