CN104810819A - A charging device with surge protection - Google Patents
A 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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Abstract
Description
技术领域 technical field
本发明涉及充电设备领域，具体地，涉及一种具有反接保护和浪涌防护功能的充电设备。 The invention relates to the field of charging equipment, in particular to a charging equipment with functions of reverse connection protection and surge protection.
背景技术 Background technique
现有的很多通信设备的充电设备都设置有充电端口和接地端口，充电时，充电端口接电源，接地端口接地，能够对电气进行快速充电。为了对充电设备进行保护，设置有反接保护电路和浪涌防护电路，现有的通信设备的充电保护电路的浪涌防护电路其利用气体放电管来实现，其有一些弊端。其对浪涌进行泄放时，不能将浪涌有效完全的泄放掉，且有些型号的气体放电管其会出现续流现象，长时间续流会导致失效，不能对浪涌进行有效的泄放。 The charging devices of many existing communication devices are provided with a charging port and a grounding port. When charging, the charging port is connected to a power source, and the grounding port is grounded, so that the electricity can be charged quickly. In order to protect the charging equipment, a reverse connection protection circuit and a surge protection circuit are provided. The surge protection circuit of the charging protection circuit of the existing communication equipment is realized by a gas discharge tube, which has some disadvantages. When it discharges the surge, it cannot discharge the surge effectively and completely, and some types of gas discharge tubes will have a continuous flow phenomenon, and the continuous flow will cause failure for a long time, and the surge cannot be effectively discharged. put.
发明内容 Contents of the invention
本发明所要解决的技术问题是提供一种具有浪涌防护的充电设备，其可有效的实现对浪涌的防护。 The technical problem to be solved by the present invention is to provide a charging device with surge protection, which can effectively realize the protection against surge.
本发明解决上述问题所采用的技术方案是： The technical solution adopted by the present invention to solve the above problems is:
一种具有浪涌防护的充电设备，包括电源端口、内部电路和接地端口，所述的电源端口和内部电路之间、内部电路和接地端口之间分别连接有浪涌防护电路、反接保护电路，所述的浪涌防护电路包括相并联的气体放电管和压敏电阻，气体放电管的一端连接在电源端口上且另一端接地，所述的浪涌防护电路还包括二极管，所述的二极管为瞬态抑制二极管，所述的二极管的负极连接在电源端口上且正极接地。 A charging device with surge protection, comprising a power port, an internal circuit and a grounding port, a surge protection circuit and a reverse polarity protection circuit are respectively connected between the power port and the internal circuit, and between the internal circuit and the grounding port , the surge protection circuit includes a gas discharge tube and a varistor connected in parallel, one end of the gas discharge tube is connected to the power port and the other end is grounded, the surge protection circuit also includes a diode, and the diode It is a transient suppression diode, the cathode of the diode is connected to the power port and the anode is grounded.
本发明的电路工作原理与现有技术的原理一致。本发明仅在现有电路的基础上在电源接口连接一瞬态抑制二极管，当浪涌作用于电源端口，气体放电管不能完全将浪涌泄放掉，利用瞬态抑制二极管对浪涌进行二次泄放，达到对浪涌的完全泄放，且利用瞬态抑制二极管可有效的提高浪涌防护电路的防护能力，实现对浪涌的二次泄放，对浪涌完全泄放；也可作为“冗余”浪涌泄放电路以避免气体放电管长时间续流导致失效的问题。 The working principle of the circuit of the present invention is consistent with that of the prior art. The present invention only connects a transient suppression diode to the power supply port on the basis of the existing circuit. When the surge acts on the power supply port, the gas discharge tube cannot completely release the surge, and the transient suppression diode is used to perform secondary surge suppression on the surge. The secondary discharge can achieve the complete discharge of the surge, and the use of transient suppression diodes can effectively improve the protection ability of the surge protection circuit, realize the secondary discharge of the surge, and completely discharge the surge; it can also be used As a "redundant" surge discharge circuit to avoid the failure of the gas discharge tube caused by long-term freewheeling.
作为优选，所述的反接保护电路包括场效应管、第二电阻和比较器，所述的场效应管的漏极与内部电路相连且源极与接地端口相连，所述的第二电阻的一端与效应管的漏极相连且另一端接地，所述的第二电阻的两端分别连接在比较器的输入端上，所述的比较器的输出端与场效应管的栅极相连。当接地端口上连接电源时，反接保护电路即启动，第二电阻上产生压降，使得比较器翻转并输出信号将场效应管关断，截断接地端口和内部电路之间的通路，对设备进行保护。 Preferably, the reverse connection protection circuit includes a field effect transistor, a second resistor and a comparator, the drain of the field effect transistor is connected to the internal circuit and the source is connected to the ground port, and the second resistor One end is connected to the drain of the effect transistor and the other end is grounded. The two ends of the second resistor are respectively connected to the input ends of the comparator, and the output end of the comparator is connected to the gate of the field effect transistor. When the power supply is connected to the ground port, the reverse polarity protection circuit is activated, and a voltage drop occurs on the second resistor, which makes the comparator flip and output a signal to turn off the FET, cut off the path between the ground port and the internal circuit, and protect the device for protection.
进一步的，所述的瞬态抑制二极管为SMCJ8.5A。 Further, the TVS diode is SMCJ8.5A.
综上，本发明的有益效果是： In sum, the beneficial effects of the present invention are:
1、本发明在现有技术的基础上在电源端口上连接一瞬态抑制二极管，有效的提高浪涌防护电路的防护能力，实现对浪涌的二次泄放，对浪涌完全泄放；也可作为“冗余”浪涌泄放电路以避免气体放电管长时间续流导致失效的问题。 1. On the basis of the prior art, the present invention connects a transient suppression diode to the power supply port, effectively improving the protection ability of the surge protection circuit, realizing the secondary discharge of the surge, and completely discharging the surge; It can also be used as a "redundant" surge discharge circuit to avoid the failure of the gas discharge tube caused by long-term continuous flow.
2、本发明的电路结构简单，易于实现。 2. The circuit structure of the present invention is simple and easy to realize.
附图说明 Description of drawings
图1是本发明的电路原理图。 Fig. 1 is the schematic circuit diagram of the present invention.
附图中标记及相应的零部件名称：G、气体放电管；R1、瞬态抑制二极管；R2、第二电阻；D、二极管；A、比较器；MOS、场效应管。 The marks in the drawings and the names of corresponding parts: G, gas discharge tube; R1, transient suppression diode; R2, second resistor; D, diode; A, comparator; MOS, field effect tube.
具体实施方式 Detailed ways
下面结合实施例及附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。 The technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments and accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
实施例1： Example 1:
如图1所示的一种具有浪涌防护的充电设备，包括电源端口、内部电路和接地端口，所述的电源端口和内部电路之间、内部电路和接地端口之间分别连接有浪涌防护电路、反接保护电路，所述的浪涌防护电路包括相并联的气体放电管G和压敏电阻R1，气体放电管G的一端连接在电源端口上且另一端接地，所述的浪涌防护电路还包括二极管D，所述的二极管D为瞬态抑制二极管，所述的二极管D的负极连接在电源端口上且正极接地。 As shown in Figure 1, a charging device with surge protection includes a power port, an internal circuit and a grounding port, and surge protection devices are respectively connected between the power port and the internal circuit, and between the internal circuit and the grounding port. circuit, reverse connection protection circuit, the surge protection circuit includes a gas discharge tube G and a varistor R1 connected in parallel, one end of the gas discharge tube G is connected to the power port and the other end is grounded, and the surge protection circuit The circuit also includes a diode D, the diode D is a transient suppression diode, the cathode of the diode D is connected to the power port and the anode is grounded.
瞬态抑制二极管是一种二极管形式的高效能保护器件。当二极管的两极受到反向瞬态高能量冲击时，它能以10的负12次方秒量级的速度，将其两极间的高阻抗变为低阻抗，吸收高达数千瓦的浪涌功率，使两极间的电压箝位于一个预定值，有效地保护电子线路中的精密元 器件，免受各种浪涌脉冲的损坏。 A TVS diode is a high-efficiency protection device in the form of a diode. When the two poles of the diode are impacted by reverse transient high energy, it can change the high impedance between its two poles to low impedance at a speed of 10 minus 12 seconds, absorbing surge power up to several thousand watts, Clamp the voltage between the two poles at a predetermined value, effectively protecting the precision components in the electronic circuit from damage by various surge pulses.
由于瞬态抑制二极管的响应速度快，也可有效地提高相应速度。 Due to the fast response speed of the TVS diode, the corresponding speed can also be effectively improved.
实施例2： Example 2:
如图1所示的一种具有浪涌防护的充电设备，本实施例在上述实施例的基础上对反接保护电路做了细化，即所述的反接保护电路包括场效应管MOS、第二电阻R2和比较器A，所述的场效应管MOS的漏极与内部电路相连且源极与接地端口相连，所述的第二电阻R2的一端与效应管MOS的漏极相连且另一端接地，所述的第二电阻R2的两端分别连接在比较器A的输入端上，所述的比较器A的输出端与场效应管MOS的栅极相连。 As shown in Figure 1, a charging device with surge protection, this embodiment refines the reverse connection protection circuit on the basis of the above embodiments, that is, the reverse connection protection circuit includes a field effect transistor MOS, The second resistor R2 and the comparator A, the drain of the field effect transistor MOS is connected to the internal circuit and the source is connected to the ground port, one end of the second resistor R2 is connected to the drain of the effect transistor MOS and the other One end is grounded, the two ends of the second resistor R2 are respectively connected to the input end of the comparator A, and the output end of the comparator A is connected to the gate of the field effect transistor MOS.
实施例3： Example 3:
如图1所示的一种具有浪涌防护的充电设备，本实施例在上述实施例的基础上做了优化，所述的瞬态抑制二极管为SMCJ8.5A。 A charging device with surge protection as shown in FIG. 1 , this embodiment is optimized on the basis of the above embodiments, and the transient suppression diode is SMCJ8.5A.
SMCJ8.5A的价格低廉，其在实现对浪涌的泄放的同时，可有效地减小成本，使电路适于大规模生产。 The price of the SMCJ8.5A is low, and it can effectively reduce the cost while realizing the discharge of the surge, making the circuit suitable for mass production.
如上所述，可较好的实现本发明。 As described above, the present invention can be preferably carried out.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510213322.9A CN104810819A (en) | 2015-04-30 | 2015-04-30 | A charging device with surge protection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510213322.9A CN104810819A (en) | 2015-04-30 | 2015-04-30 | A charging device with surge protection |
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| CN104810819A true CN104810819A (en) | 2015-07-29 |
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| CN201510213322.9A Pending CN104810819A (en) | 2015-04-30 | 2015-04-30 | A charging device with surge protection |
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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 |
| 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 |
| CN120914727A (en) * | 2025-09-30 | 2025-11-07 | 四川天邑康和通信股份有限公司 | Protection isolation circuit for household FTTR set top box |
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 (4)
| 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 |
| CN120914727A (en) * | 2025-09-30 | 2025-11-07 | 四川天邑康和通信股份有限公司 | Protection isolation circuit for household FTTR set top box |
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Application publication date: 20150729 |