CN203233165U - Starting-up surge-protection circuit for camera - Google Patents
Starting-up surge-protection circuit for camera Download PDFInfo
- Publication number
- CN203233165U CN203233165U CN 201320261623 CN201320261623U CN203233165U CN 203233165 U CN203233165 U CN 203233165U CN 201320261623 CN201320261623 CN 201320261623 CN 201320261623 U CN201320261623 U CN 201320261623U CN 203233165 U CN203233165 U CN 203233165U
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- resistance
- surge
- circuit
- camera
- effect transistor
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Abstract
The utility model discloses a starting-up surge-protection circuit for a camera, and the circuit comprises a delay circuit, and a protection circuit electrically connected with the delay circuit. The delay circuit comprises a resistor R2 and a capacitor C1. One terminal of the capacitor C1 is connected with the resistor R2, and the other terminal of the capacitor is grounded. The protection circuit comprises a comparator, a resistor R1, and a P-type channel field effect transistor. Two terminals of the comparator are respectively connected to two terminals of the resistor R1. The output of the comparator is connected to the gate electrode of the P-type channel field-effect transistor. The source electrode of the P-type channel field-effect transistor is connected to one terminal of the resistor R1, and the other terminal of the resistor R1 is connected with the resistor R2. The starting-up surge-protection circuit is advantageous by being capable of effectively discharging starting-up surge, having a simple structure, and applicable to small thin cameras.
Description
Technical field
The utility model relates to a kind of anti-surge circuit, relates to a kind of start anti-surge circuit 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.
The utility model content
The utility model provides a kind of start anti-surge circuit 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 utility model by the following technical solutions:
A kind of start anti-surge circuit 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 utility model, 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 beneficial effects of the utility model are:
1, the utility model 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 utility model 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 utility model is described in further detail.
Fig. 1 is circuit principle structure figure of the present utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.Execution mode of the present utility model includes but not limited to the following example.
[embodiment]
A kind of start anti-surge circuit for camera as shown in Figure 1, 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.
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 embodiment of the present utility model as mentioned above.The utility model is not limited to above-mentioned execution mode, and anyone should learn the structural change of making under enlightenment of the present utility model, every with the utlity model has identical or close technical scheme, all fall within the protection range of the present utility model.
Claims (5)
1. start anti-surge 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 start anti-surge circuit 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 start anti-surge circuit 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 start anti-surge circuit 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 start anti-surge circuit for camera according to claim 1, it 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 |
|---|---|---|---|
| CN 201320261623 CN203233165U (en) | 2013-05-15 | 2013-05-15 | Starting-up surge-protection circuit for camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320261623 CN203233165U (en) | 2013-05-15 | 2013-05-15 | Starting-up surge-protection circuit for camera |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203233165U true CN203233165U (en) | 2013-10-09 |
Family
ID=49289269
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320261623 Expired - Fee Related CN203233165U (en) | 2013-05-15 | 2013-05-15 | Starting-up surge-protection circuit for camera |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203233165U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104485632A (en) * | 2014-11-21 | 2015-04-01 | 成都嵌智捷科技有限公司 | Current sampling circuit based on embedded field |
-
2013
- 2013-05-15 CN CN 201320261623 patent/CN203233165U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104485632A (en) * | 2014-11-21 | 2015-04-01 | 成都嵌智捷科技有限公司 | Current sampling circuit based on embedded field |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131009 Termination date: 20140515 |