CN103227462A - Surge protecting circuit for camera - Google Patents
Surge protecting circuit for camera Download PDFInfo
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- CN103227462A CN103227462A CN2013101775879A CN201310177587A CN103227462A CN 103227462 A CN103227462 A CN 103227462A CN 2013101775879 A CN2013101775879 A CN 2013101775879A CN 201310177587 A CN201310177587 A CN 201310177587A CN 103227462 A CN103227462 A CN 103227462A
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- channel field
- resistor
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Abstract
The invention discloses a surge protecting circuit for a camera, and the surge protecting circuit comprises a time delay circuit and a protective circuit, wherein the protective circuit is electrically connected with the time delay circuit; the time delay circuit comprises a resistor R2 and a capacitor C1; one end of the capacitor C1 is connected with the resistor R2, and the other end of the capacitor C1 is connected to the ground; the protective circuit comprises a comparer, a resistor R1 and a P channel field-effect tube; two input ends of the comparer are respectively connected with both ends of the resistor R1, and the output end of the comparer is connected with the grid electrode of the P channel field-effect tube; the source electrode of the P channel field-effect tube is connected with one end of the resistor R1; and the other end of the resistor R1 is connected with the resistor R2. The surge protecting circuit disclosed by the invention can effectively release the surge generated through starting, is simple in circuit structure and is suitable for a small and thin camera.
Description
Technical field
The present invention relates to a kind of anti-surge circuit, relate to a kind of surge protection circuit that is used for camera in particular.
Background technology
Camera is when start, and its power port can produce the moment surge voltage.Its surge voltage is to the destructive suitable height of camera internal circuit, especially to responsive electronic devices and components.It generally can be connected the anti-surge circuit of starting shooting between power supply and internal circuit.But its circuit structure of existing anti-surge circuit is complicated, and not only bad for welding operation, and electronic devices and components are many, because present its volume of camera is thin, it is unfavorable for the use of slimline camera.
Summary of the invention
The invention provides a kind of surge protection circuit that is used for camera, its surge that start produces of effectively releasing, and circuit structure is simple, and suitable small and exquisite thin camera uses.
For solving above-mentioned technical problem, the present invention by the following technical solutions:
A kind of surge protection circuit that is used for camera, it comprises delay circuit and the protective circuit that electrically connects with delay circuit, and described delay circuit comprises resistance R 2 and capacitor C 1, and an end of described capacitor C 1 links to each other with resistance R 2, other end ground connection; Described protective circuit comprises comparator, resistance R 1 and P-channel field-effect transistor (PEFT) pipe; two inputs of described comparator are connected to the two ends of resistance R 1; the output of described comparator is connected on the grid of P-channel field-effect transistor (PEFT) pipe; the source electrode of described P-channel field-effect transistor (PEFT) pipe is connected an end of resistance R 1, and the other end of described resistance R 1 links to each other with resistance R 2.
Further technical scheme is:
As preferably, the resistance of described resistance R 1 is greater than the resistance of resistance R 2.
Further, the drain electrode of described P-channel field-effect transistor (PEFT) pipe is connected on the camera internal circuit.
Further, the end that is connected with resistance R 2 of described resistance R 1 is connected on the power interface simultaneously.
As preferably, the Standard resistance range of described R1 is 600 ohm-1000 ohm.
Be connected an end of resistance R 1 at power interface of the present invention, and this end of resistance R 1 is connected on the resistance R 2, the internal circuit of camera is connected the drain electrode of P-channel field-effect transistor (PEFT) pipe.When camera is started shooting, can produce powerful pulse, the buffer structure of doing by delay circuit delays the surge time.By protective circuit surge is released, comparator detects the electric current at resistance two ends again, and pressure drop increased when electric current was excessive, made the output signal of comparator hang up switching device, to reach anti-surge effect.The circuit structure of this circuit is simple, is applicable to that small and exquisite thin camera uses.
Compared with prior art, the invention has the beneficial effects as follows:
1, the present invention's surge that start produces of can effectively releasing prevents that camera start surge from causing damage to the camera internal circuit.
2, circuit structure of the present invention is simple, and the electronic devices and components of use are few, uses applicable to thin small and exquisite camera.
Description of drawings
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Fig. 1 is circuit principle structure figure of the present invention.
Embodiment
The present invention is further illustrated below in conjunction with accompanying drawing.Embodiments of the present invention include but not limited to the following example.
[embodiment]
A kind of surge protection circuit that is used for camera as shown in Figure 1, it comprises delay circuit and the protective circuit that electrically connects with delay circuit, and described delay circuit comprises resistance R 2 and capacitor C 1, and an end of described capacitor C 1 links to each other with resistance R 2, other end ground connection; Described protective circuit comprises comparator, resistance R 1 and P-channel field-effect transistor (PEFT) pipe; two inputs of described comparator are connected to the two ends of resistance R 1; the output of described comparator is connected on the grid of P-channel field-effect transistor (PEFT) pipe; the source electrode of described P-channel field-effect transistor (PEFT) pipe is connected an end of resistance R 1, and the other end of described resistance R 1 links to each other with resistance R 2.
The resistance of described resistance R 1 is greater than the resistance of resistance R 2.
The drain electrode of described P-channel field-effect transistor (PEFT) pipe is connected on the camera internal circuit.
The end that described resistance R 1 is connected with resistance R 2 is connected on the power interface simultaneously.
The Standard resistance range of described R1 is 600 ohm-1000 ohm.
Be embodiments of the invention as mentioned above.The present invention is not limited to above-mentioned execution mode, and anyone should learn the structural change of making under enlightenment of the present invention, and every have identical or close technical scheme with the present invention, all falls within protection scope of the present invention.
Claims (5)
1. surge protection circuit that is used for camera, it is characterized in that: it comprises delay circuit and the protective circuit that electrically connects with delay circuit, described delay circuit comprises resistance R 2 and capacitor C 1, and an end of described capacitor C 1 links to each other with resistance R 2, other end ground connection; Described protective circuit comprises comparator, resistance R 1 and P-channel field-effect transistor (PEFT) pipe; two inputs of described comparator are connected to the two ends of resistance R 1; the output of described comparator is connected on the grid of P-channel field-effect transistor (PEFT) pipe; the source electrode of described P-channel field-effect transistor (PEFT) pipe is connected an end of resistance R 1, and the other end of described resistance R 1 links to each other with resistance R 2.
2. a kind of surge protection circuit that is used for camera according to claim 1, it is characterized in that: the resistance of described resistance R 1 is greater than the resistance of resistance R 2.
3. a kind of surge protection circuit that is used for camera according to claim 1, it is characterized in that: the drain electrode of described P-channel field-effect transistor (PEFT) pipe is connected on the camera internal circuit.
4. a kind of surge protection circuit that is used for camera according to claim 3, it is characterized in that: the end that described resistance R 1 is connected with resistance R 2 is connected on the power interface simultaneously.
5. a kind of surge protection circuit that is used for camera according to claim 1 is characterized in that: the Standard resistance range of described R1 is 600 ohm-1000 ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101775879A CN103227462A (en) | 2013-05-15 | 2013-05-15 | Surge protecting circuit for camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101775879A CN103227462A (en) | 2013-05-15 | 2013-05-15 | Surge protecting circuit for camera |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103227462A true CN103227462A (en) | 2013-07-31 |
Family
ID=48837787
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013101775879A Pending CN103227462A (en) | 2013-05-15 | 2013-05-15 | Surge protecting circuit for camera |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103227462A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683243A (en) * | 2013-11-28 | 2014-03-26 | 成都市宏山科技有限公司 | Refrigerator with surge protection function |
| CN104617789A (en) * | 2015-02-05 | 2015-05-13 | 成都市宏山科技有限公司 | Simple power circuit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060158811A1 (en) * | 2005-01-18 | 2006-07-20 | Alcatel | Protection circuit |
| CN101119021A (en) * | 2006-05-10 | 2008-02-06 | 三星电子株式会社 | Over voltage protection circuit and method thereof |
| US20110235228A1 (en) * | 2010-03-25 | 2011-09-29 | Analog Devices, Inc. | Apparatus and method for electronic circuit protection |
| CN202524058U (en) * | 2012-02-06 | 2012-11-07 | 苏州葵花光电科技有限公司 | Protection circuit against overvoltage, undervoltage and power reverse |
-
2013
- 2013-05-15 CN CN2013101775879A patent/CN103227462A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060158811A1 (en) * | 2005-01-18 | 2006-07-20 | Alcatel | Protection circuit |
| CN101119021A (en) * | 2006-05-10 | 2008-02-06 | 三星电子株式会社 | Over voltage protection circuit and method thereof |
| US20110235228A1 (en) * | 2010-03-25 | 2011-09-29 | Analog Devices, Inc. | Apparatus and method for electronic circuit protection |
| CN202524058U (en) * | 2012-02-06 | 2012-11-07 | 苏州葵花光电科技有限公司 | Protection circuit against overvoltage, undervoltage and power reverse |
Non-Patent Citations (1)
| Title |
|---|
| 戴钱坤等: "一种新型机载防浪涌电压保护电路设计", 《电子技术应用》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683243A (en) * | 2013-11-28 | 2014-03-26 | 成都市宏山科技有限公司 | Refrigerator with surge protection function |
| CN104617789A (en) * | 2015-02-05 | 2015-05-13 | 成都市宏山科技有限公司 | Simple power circuit |
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| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20130731 |