CN204633325U - A kind of charging device - Google Patents
A kind of charging device Download PDFInfo
- Publication number
- CN204633325U CN204633325U CN201520271042.9U CN201520271042U CN204633325U CN 204633325 U CN204633325 U CN 204633325U CN 201520271042 U CN201520271042 U CN 201520271042U CN 204633325 U CN204633325 U CN 204633325U
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- Prior art keywords
- protection circuit
- diode
- power port
- charging device
- circuit
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Abstract
The utility model discloses a kind of charging device, comprise power port, internal circuit and grounding ports, between described power port and internal circuit, surging protection circuit is connected between internal circuit and grounding ports, reverse-connection protection circuit, described surging protection circuit comprises the gas discharge tube and piezo-resistance that are in parallel, one end of gas discharge tube to be connected on power port and other end ground connection, described surging protection circuit also comprises diode, described diode is Transient Suppression Diode, the negative pole of described diode to be connected on power port and plus earth, it effectively can realize the protection to surge.
Description
Technical field
The utility model relates to charging device field, particularly, relates to a kind of charging device with reverse connecting protection and carrying out surge protection function.
Background technology
the charging device of existing a lot of communication equipment is all provided with charging port and grounding ports, and during charging, charging port connects power supply, grounding ports ground connection, can to electrically carrying out quick charge.In order to protect charging device, be provided with reverse-connection protection circuit and surging protection circuit, the surging protection circuit of the charge protector of existing communication equipment its utilize gas discharge tube to realize, it has some drawbacks.When it is released to surge, surge can not be released effectively completely, and the gas discharge tube of some model its there will be afterflow phenomenon, long-time afterflow can cause lost efficacy, effectively can not release to surge.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of charging device, and it effectively can realize the protection to surge.
The technical scheme in the invention for solving the above technical problem is:
A kind of charging device; comprise power port, internal circuit and grounding ports; surging protection circuit, reverse-connection protection circuit is connected between described power port and internal circuit, between internal circuit and grounding ports; described surging protection circuit comprises the gas discharge tube and piezo-resistance that are in parallel; one end of gas discharge tube to be connected on power port and other end ground connection; described surging protection circuit also comprises diode; described diode is Transient Suppression Diode, and the negative pole of described diode to be connected on power port and plus earth.
Circuit working principle of the present utility model is consistent with the principle of prior art.The utility model only connects a Transient Suppression Diode at power interface on the basis of available circuit, when surge acts on power port, surge can not be fallen by gas discharge tube completely, utilize Transient Suppression Diode to carry out secondary to surge to release, reach releasing completely to surge, and utilize Transient Suppression Diode effectively can improve the protective capacities of surging protection circuit, realize releasing to the secondary of surge, surge is released completely; Also can be used as " redundancy " surge circuit and cause to avoid the long-time afterflow of gas discharge tube the problem lost efficacy.
As preferably; described reverse-connection protection circuit comprises field effect transistor, the second resistance and comparator; the drain electrode of described field effect transistor is connected with internal circuit and source electrode is connected with grounding ports; one end of the second described resistance is connected and other end ground connection with the drain electrode of effect pipe; the two ends of the second described resistance are connected on the input of comparator, and the output of described comparator is connected with the grid of field effect transistor.When grounding ports connecting power supply, namely reverse-connection protection circuit starts, and the second resistance produces pressure drop, comparator is overturn and outputs signal field effect transistor to be turned off, and blocks the path between grounding ports and internal circuit, protects equipment.
Further, described Transient Suppression Diode is SMCJ8.5A.
To sum up, the beneficial effects of the utility model are:
1, the utility model connects a Transient Suppression Diode on the basis of existing technology on power port, and the effective protective capacities improving surging protection circuit, realizes releasing to the secondary of surge, release completely to surge; Also can be used as " redundancy " surge circuit and cause to avoid the long-time afterflow of gas discharge tube the problem lost efficacy.
2, circuit structure of the present utility model is simple, is easy to realize.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Mark and corresponding parts title: G, gas discharge tube in accompanying drawing; R1, Transient Suppression Diode; R2, the second resistance; D, diode; A, comparator; MOS, field effect transistor.
Embodiment
Below in conjunction with embodiment and accompanying drawing, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Embodiment 1:
A kind of charging device as shown in Figure 1, comprise power port, internal circuit and grounding ports, between described power port and internal circuit, surging protection circuit is connected between internal circuit and grounding ports, reverse-connection protection circuit, described surging protection circuit comprises the gas discharge tube G and piezo-resistance R1 that are in parallel, one end of gas discharge tube G to be connected on power port and other end ground connection, described surging protection circuit also comprises diode D, described diode D is Transient Suppression Diode, the negative pole of described diode D to be connected on power port and plus earth.
Transient Suppression Diode is a kind of high-effect protection device of diode form.When the two poles of the earth of diode are subject to reverse transient state high energy impact events; it can with the speed bearing 12 power second-times of 10; the high impedance of its two interpolar is become Low ESR; absorb the surge power up to thousands of watts; make the voltage clamp of two interpolars in a predetermined value; effectively protect the precision components in electronic circuit, from the damage of various surge pulse.
Due to the fast response time of Transient Suppression Diode, also effectively corresponding speed can be improved.
Embodiment 2:
A kind of charging device as shown in Figure 1; the present embodiment has done refinement to reverse-connection protection circuit on the basis of above-described embodiment; namely described reverse-connection protection circuit comprises field effect transistor MOS, the second resistance R2 and comparator A; the drain electrode of described field effect transistor MOS is connected with internal circuit and source electrode is connected with grounding ports; one end of the second described resistance R2 is connected and other end ground connection with the drain electrode of effect pipe MOS; the two ends of the second described resistance R2 are connected on the input of comparator A, and the described output of comparator A is connected with the grid of field effect transistor MOS.
Embodiment 3:
A kind of charging device as shown in Figure 1, the present embodiment is optimized on the basis of above-described embodiment, and described Transient Suppression Diode is SMCJ8.5A.
SMCJ8.5A's is cheap, and it is realizing, to while the releasing of surge, effectively to reduce cost, making circuit be suitable for large-scale production.
As mentioned above, the utility model can be realized preferably.
Claims (3)
1. a charging device, comprise power port, internal circuit and grounding ports, between described power port and internal circuit, surging protection circuit is connected between internal circuit and grounding ports, reverse-connection protection circuit, described surging protection circuit comprises the gas discharge tube and piezo-resistance that are in parallel, one end of gas discharge tube to be connected on power port and other end ground connection, it is characterized in that: described surging protection circuit also comprises diode, described diode is Transient Suppression Diode, the negative pole of described diode to be connected on power port and plus earth.
2. a kind of charging device according to claim 1; it is characterized in that: described reverse-connection protection circuit comprises field effect transistor, the second resistance and comparator; the drain electrode of described field effect transistor is connected with internal circuit and source electrode is connected with grounding ports; one end of the second described resistance is connected and other end ground connection with the drain electrode of effect pipe; the two ends of the second described resistance are connected on the input of comparator, and the output of described comparator is connected with the grid of field effect transistor.
3. a kind of charging device according to claim 1 and 2, is characterized in that: described Transient Suppression Diode is SMCJ8.5A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520271042.9U CN204633325U (en) | 2015-04-30 | 2015-04-30 | A kind of charging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520271042.9U CN204633325U (en) | 2015-04-30 | 2015-04-30 | A kind of charging device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204633325U true CN204633325U (en) | 2015-09-09 |
Family
ID=54052318
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520271042.9U Expired - Fee Related CN204633325U (en) | 2015-04-30 | 2015-04-30 | A kind of charging device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204633325U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018010183A1 (en) * | 2016-07-15 | 2018-01-18 | 广东欧珀移动通信有限公司 | Surge protection circuit and mobile terminal |
-
2015
- 2015-04-30 CN CN201520271042.9U patent/CN204633325U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018010183A1 (en) * | 2016-07-15 | 2018-01-18 | 广东欧珀移动通信有限公司 | Surge protection circuit and mobile terminal |
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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: 20150909 Termination date: 20160430 |