CN216531550U

CN216531550U - Control circuit of low-head power-off camera

Info

Publication number: CN216531550U
Application number: CN202122446540.0U
Authority: CN
Inventors: 张欣; 陈诗语; 毛宗全; 葉維弘; 李婉玲
Original assignee: Xiamen Intretech Inc
Current assignee: Xiamen Intretech Inc
Priority date: 2021-10-11
Filing date: 2021-10-11
Publication date: 2022-05-13
Anticipated expiration: 2031-10-11

Abstract

The utility model provides a control circuit of a low-head power-off camera, which comprises: the first sub-circuit comprises an electrostatic protector, a linear voltage stabilizer and a USB interface, and the USB interface is connected with the electronic equipment; a second sub-circuit including a hall sensor that detects a magnetic flux of the magnet; and the third sub-circuit comprises a GPIO (general purpose input/output) end, and the GPIO end is connected with the Hall sensor.

Description

Control circuit of low-head power-off camera

Technical Field

The utility model relates to the field of camera circuits, in particular to a control circuit of a low-head power-off camera.

Background

In the USB camera system on the market at present, the use scene is mostly on user's desktop or display, and it is downward to realize the camera rotation back low head through swivel mount.

Due to the occurrence of various camera door events, the progress of network hacker technology prevents users from having a sense of security for software to close the camera, and users prefer the mode of physically solving the shot towards a private information scene.

In the existing lens-down solution, although the lens can be adjusted to be outside the user privacy information, the camera still continuously outputs pictures because the camera is not powered off, so that on one hand, power consumption is increased, the service life of the camera is reduced, and on the other hand, if the user is in a conference, the pictures output by the camera also continuously exist in a video conference system, and data traffic consumption is increased.

Most of products on the market use a mode of manually disconnecting a USB interface or clicking software to close equipment to cut off power, and need to be powered on again or connected by pressing a switch when the products are used again. However, the method for physically and manually disconnecting the USB interface is complicated, and the USB interface of the user may be set at an inconvenient plugging position, which may cause inconvenience.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a control circuit of a low-head power-off camera.

The utility model aims to solve the problems existing in the use of the existing camera.

Compared with the prior art, the technical scheme and the beneficial effects of the utility model are as follows:

a control circuit for a low-profile power-off camera, comprising: the first sub-circuit comprises an electrostatic protector, a linear voltage stabilizer and a USB interface, and the USB interface is connected with the electronic equipment; a second sub-circuit including a hall sensor that detects a magnetic flux of the magnet; and the third sub-circuit comprises a GPIO (general purpose input/output) end, and the GPIO end is connected with the Hall sensor.

As a further improvement, the first sub-circuit further includes: the common-mode inductor is connected to the linear voltage stabilizer, and the electrostatic protector is connected to the common-mode inductor; the base electrode of the triode is connected to the level output end, and the emitting electrode of the triode is grounded; one end of the first resistor is connected to a collector of the triode; the grid electrode of the MOS tube is connected to the other end of the first resistor, the source electrode of the MOS tube is connected to the USB voltage end, and the drain electrode of the MOS tube is connected to the power supply end; the first inductor is connected in series between the source electrode and the drain electrode of the MOS tube.

As a further improvement, the second shunt circuit includes: one end of the capacitor is connected to the voltage end of the Hall sensor, and the other end of the capacitor is grounded; the cathode of the voltage stabilizing diode is connected to the output end of the Hall sensor, and the anode of the voltage stabilizing diode is grounded; and the light emitting diode is connected in series with the electrostatic protector.

As a further improvement, the MOS tube is an enhancement type MOS tube.

As a further improvement, the triode is of NPN type.

The utility model has the beneficial effects that:

the utility model has ingenious structural design and adopts the combination of the first sub-circuit, the second sub-circuit and the third sub-circuit;

when the camera is lowered, the Hall sensor is close to the magnet, and the magnetic flux sensed by the Hall sensor is increased to reach a certain standard, the Vout pin of the Hall sensor outputs a high level, the PM _ GPIO3 pin detects the high level, and the camera enters a sleep working mode;

when the camera is raised, the Hall sensor is far away from the magnet, and the magnetic flux sensed by the Hall sensor is reduced to reach a certain standard, the Vout pin of the Hall sensor outputs a low level, and the PM _ GPIO3 pin detects the low level and enters a normal mode;

combine the camera product to make up the realization, when casing and base rotation each other, the distance between magnet and the hall sensor changes, and the magnetic flux of hall sensor response also changes, compares with the threshold value of switching point according to the magnet volume of sensing, and the operating condition of switching control camera realizes the technological effect of low head outage, has protected user privacy, improves the practicality of product.

Drawings

Fig. 1 is a schematic structural diagram of a low-head powered-off camera according to an embodiment of the present invention.

Fig. 2 is a structural sectional view of a low-head powered-off camera in normal use according to an embodiment of the present invention.

Fig. 3 is a structural cross-sectional view of a camera with a power-down function according to an embodiment of the present invention.

Fig. 4 is a schematic diagram of a first sub-circuit according to an embodiment of the present invention.

Fig. 5 is a schematic diagram of a second sub-circuit provided in the embodiment of the present invention.

Fig. 6 is a schematic diagram of a third sub-circuit provided in the embodiment of the present invention.

In the figure:

1. base 2, shell 3, lens

4. Hall sensor 5, magnet 6, microphone

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Referring to fig. 1 to 3, a low head powered camera includes: a base 1; the shell 2 is movably hinged to the base 1, and a certain rotation angle is formed between the shell 2 and the base 1; a controller; the lens 3 is arranged on the shell 2, and the lens 3 is electrically connected with the controller; the Hall sensor 4 is arranged on the shell 2, and the Hall sensor 4 is electrically connected with the controller; a magnet 5, wherein the magnet 5 is installed on the base 1, and the hall sensor 4 detects the magnetic flux of the magnet 5; the angle formed between the base 1 and the shell 2 is adjusted, so that the magnetic flux measured by the Hall sensor 4 is adjusted, and the on-off of the camera is controlled by judging the numerical value of the magnetic flux and the threshold value of the switching point.

The controller comprises a USB interface, and the USB interface is connected to the electronic equipment.

The controller comprises a GPIO port, and the GPIO port is connected to the Hall sensor 4.

The camera with the low head power supply comprises a microphone 6, wherein the microphone 6 is arranged on the shell 2, and the microphone 6 is electrically connected with the controller.

The hall sensor 4 is a unipolar hall sensor or a full-polarity hall sensor.

The magnetic flux and polarity of the magnet 5 needs to match the magnetic flux operating point Bop and release point Brp of the hall sensor 4.

When the camera is lowered to a position lower than the preset angle, the camera enters a sleep mode due to the sensor, the camera stops shooting, and meanwhile the USB camera equipment pops out of the PC.

When the camera head rises to be higher than the preset angle, the camera enters a normal working mode due to the sensor, the camera continues to shoot, and meanwhile the USB camera equipment is connected to the PC again.

The working principle of the low-head power-off camera is as follows:

the utility model realizes the detection of the head lowering angle of the camera through the Hall effect of the Hall sensor 4, thereby realizing the function of head lowering dormancy.

When the camera is normally used, the magnetic flux of the magnet 5 placed on the bracket is smaller than the magnetic flux value of the conduction working point of the switch of the Hall sensor 4, and the Hall sensor 4 is in a configured default output state (high level/low level);

when the camera is lowered to a set angle, the magnetic flux of the magnet 5 placed on the support is larger than the conduction magnetic flux value of the switch of the Hall sensor 4, and the Hall sensor 4 is switched to a conduction output level from a non-conduction output level, so that the switching from the lowered angle to the level is realized. When the initial state of the camera is in a low head state, if the head-up angle is larger than a preset head-up angle, the magnetic flux sensed by the Hall sensor 4 is smaller than a release point of the Hall sensor 4, and the Hall sensor 4 is switched from a conducted output level to a non-conducted output level, so that the switching from the head-up angle to the level is realized;

the output of the Hall sensor 4 is connected to a GPIO port of a processor of the USB camera, and the processor sets working modes according to different levels of the GPIO port. When sensing that the camera is lower than the low head angle, the master control will close the function of camera sensor part, stop camera work, and master control IC gets into low-power consumption sleep mode, and equipment pops out from the PC. When sensing that the camera is higher than the low head angle, the master control will open the function of camera sensor part, and master control IC is in normal operating mode, and equipment normally is connected to the PC and gets into photography mode.

Referring to fig. 4 to 6, a control circuit of a low head power-off camera includes: the first sub-circuit comprises an electrostatic protector U109, a linear voltage regulator U105 and a USB interface, and the USB interface is connected to the electronic equipment; a second sub-circuit including a hall sensor U102, the hall sensor U102 detecting a magnetic flux of the magnet; and the third sub-circuit comprises a GPIO (general purpose input/output) end, and the GPIO end is connected to the Hall sensor U102.

The first sub-circuit further comprises: the common mode inductor L102, the common mode inductor L102 is connected to the linear regulator U105, and the electrostatic protector U109 is connected to the common mode inductor L102; the base electrode of the triode Q104 is connected to the level output end, and the emitting electrode of the triode Q104 is grounded; one end of the first resistor R127 is connected to the collector of the triode; a gate of the MOS transistor Q102 is connected to the other end of the first resistor R127, a source of the MOS transistor Q102 is connected to the USB voltage terminal, and a drain of the MOS transistor Q102 is connected to the power supply terminal; a first inductor L103, where the first inductor L103 is connected in series between the source and the drain of the MOS transistor Q102.

The second shunt circuit includes: one end of the capacitor C102 is connected to the voltage end of the Hall sensor U102, and the other end of the capacitor C102 is grounded; a cathode of the zener diode D103 is connected to the output end of the hall sensor U102, and an anode of the zener diode D103 is grounded; and the light emitting diode D100, wherein the light emitting diode D100 is connected in series with the electrostatic protector U109.

The MOS tube Q102 is an enhancement type MOS tube. The triode Q104 is NPN type.

The utility model connects with external USB line through J100 connector, and supplies power to the whole machine with USB 5V.

High and low level signals output by the Hall sensor are sent to an ISP main control chip detection pin, and a camera sleep mode and a normal working mode are realized by software.

When the camera head is lowered, the Hall sensor U102 is close to the magnet, and the magnetic flux sensed by the Hall sensor U102 is increased to a certain level, the Vout pin of the Hall sensor U102 outputs a high level, the PM _ GPIO3 pin detects the high level, and the camera head enters a sleep mode.

When the camera head is raised, the hall sensor U102 moves away from the magnet, and the magnetic flux sensed by the hall sensor U102 decreases to a certain level, the Vout pin of the hall sensor U102 outputs a low level, and the PM _ GPIO3 pin detects the low level, and the normal mode is entered.

The above examples are only for illustrating the technical solutions of the present invention and not for limiting the same. It will be understood by those skilled in the art that any modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention as set forth in the appended claims.

Claims

1. A control circuit of a low head power-off camera, comprising:

the first sub-circuit comprises an electrostatic protector, a linear voltage stabilizer and a USB interface, and the USB interface is connected with the electronic equipment;

a second sub-circuit including a hall sensor that detects a magnetic flux of the magnet;

and the third sub-circuit comprises a GPIO (general purpose input/output) end, and the GPIO end is connected with the Hall sensor.

2. The control circuit of a low-head power-off camera according to claim 1, wherein the first sub-circuit further comprises:

the common-mode inductor is connected to the linear voltage stabilizer, and the electrostatic protector is connected to the common-mode inductor;

the base electrode of the triode is connected to the level output end, and the emitting electrode of the triode is grounded;

one end of the first resistor is connected to a collector of the triode;

the grid electrode of the MOS tube is connected to the other end of the first resistor, the source electrode of the MOS tube is connected to the USB voltage end, and the drain electrode of the MOS tube is connected to the power supply end;

the first inductor is connected in series between the source electrode and the drain electrode of the MOS tube.

3. The control circuit of a low head power-off camera according to claim 1, wherein the second sub-circuit comprises:

one end of the capacitor is connected to the voltage end of the Hall sensor, and the other end of the capacitor is grounded;

the cathode of the voltage stabilizing diode is connected to the output end of the Hall sensor, and the anode of the voltage stabilizing diode is grounded;

and the light emitting diode is connected in series with the electrostatic protector.

4. The control circuit of a low head power-off camera according to claim 2, wherein the MOS transistor is an enhancement MOS transistor.

5. The control circuit of claim 2, wherein the transistor is of NPN type.