CN104810819A - Charging device with surge protection - Google Patents
Charging device with surge protection Download PDFInfo
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- CN104810819A CN104810819A CN201510213322.9A CN201510213322A CN104810819A CN 104810819 A CN104810819 A CN 104810819A CN 201510213322 A CN201510213322 A CN 201510213322A CN 104810819 A CN104810819 A CN 104810819A
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- diode
- protection circuit
- charging device
- surge protection
- circuit
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Abstract
The invention discloses a charging device with surge protection. The charging device comprises a power source port, an internal circuit and a grounding port. A surge protection circuit and an inversed connection protection circuit are connected between the power source port and the internal circuit and between the internal circuit and the grounding port respectively. The surge protection circuit comprises a gas discharge pipe and a piezoresistor which are parallelly connected. One end of the gas discharge pipe is connected with the power source port and the other end is grounded. The surge protection circuit further comprises a diode which is a transient suppression diode. The negative electrode of the diode is connected with the power source port and the positive electrode is grounded. Accordingly, surge protection can be effectively realized.
Description
Technical field
The present invention relates to charging device field, particularly, relate 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.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of charging device with carrying out surge protection, and it effectively can realize the protection to surge.
The present invention's adopted technical scheme that solves the problem is:
A kind of charging device with carrying out surge protection, 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.
Circuit working principle of the present invention is consistent with the principle of prior art.The present invention 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 invention has the beneficial effects as follows:
1, the present invention 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 invention is simple, is easy to realize.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention.
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 embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment 1:
A kind of charging device with carrying out surge protection 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 with carrying out surge protection 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, 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, the described output of comparator A is connected with the grid of field effect transistor MOS.
Embodiment 3:
A kind of charging device with carrying out surge protection 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 present invention can be realized preferably.
Claims (3)
1. one kind has the charging device of carrying out surge protection, 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 with carrying out surge protection 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 with carrying out surge protection 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 |
|---|---|---|---|
| CN201510213322.9A CN104810819A (en) | 2015-04-30 | 2015-04-30 | Charging device with surge protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510213322.9A CN104810819A (en) | 2015-04-30 | 2015-04-30 | Charging device with surge protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104810819A true CN104810819A (en) | 2015-07-29 |
Family
ID=53695425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510213322.9A Pending CN104810819A (en) | 2015-04-30 | 2015-04-30 | Charging device with surge protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104810819A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105262074A (en) * | 2015-11-09 | 2016-01-20 | 深圳市科陆电气技术有限公司 | Intrinsically-safe current-limiting circuit and electronic device |
| CN109802374A (en) * | 2017-11-16 | 2019-05-24 | 和硕联合科技股份有限公司 | Surge protection circuit and electronic device with surge protection circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2302621A (en) * | 1995-06-22 | 1997-01-22 | Mtl Instr Group Plc The | Electrical surge protector for signal lines |
| CN103280794A (en) * | 2013-06-14 | 2013-09-04 | 成都锐奕信息技术有限公司 | Surging resistant and reverse-connection resistant port |
| CN203233175U (en) * | 2013-05-15 | 2013-10-09 | 成都市宏山科技有限公司 | Interference-protection circuit for radio port |
-
2015
- 2015-04-30 CN CN201510213322.9A patent/CN104810819A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2302621A (en) * | 1995-06-22 | 1997-01-22 | Mtl Instr Group Plc The | Electrical surge protector for signal lines |
| CN203233175U (en) * | 2013-05-15 | 2013-10-09 | 成都市宏山科技有限公司 | Interference-protection circuit for radio port |
| CN103280794A (en) * | 2013-06-14 | 2013-09-04 | 成都锐奕信息技术有限公司 | Surging resistant and reverse-connection resistant port |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105262074A (en) * | 2015-11-09 | 2016-01-20 | 深圳市科陆电气技术有限公司 | Intrinsically-safe current-limiting circuit and electronic device |
| CN105262074B (en) * | 2015-11-09 | 2019-02-26 | 深圳市鸿陆技术有限公司 | Intrinsic safety current-limiting circuit and electronic equipment |
| CN109802374A (en) * | 2017-11-16 | 2019-05-24 | 和硕联合科技股份有限公司 | Surge protection circuit and electronic device with surge protection circuit |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150729 |
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| RJ01 | Rejection of invention patent application after publication |