KR20160031277A - Apparatus for driving heater of surveilance camera - Google Patents

Abstract

A heater driving device of a surveillance camera is provided. According to an embodiment of the present invention, the heater driving device of a surveillance camera comprises: a heater for eliminating frost generated on a lens of a surveillance camera; an illuminance sensor which senses illuminance of light; a detector which senses a signal level of the illuminance sensor which is generated in accordance with the illuminance; and a heat controller which controls a heating amount of the heater based on the signal level sensed by the detector. Therefore, the heater driving device can efficiently drive the heater of the surveillance camera installed outside within a limited consumption power range.

Description

TECHNICAL FIELD [0001] The present invention relates to a heater driving apparatus for a surveillance camera,

The present invention relates to a heater driving apparatus for a surveillance camera, and more particularly, to a heater driving apparatus for a surveillance camera capable of efficiently driving a heater of a surveillance camera within a limited power consumption range.

Closed circuit television refers to a television system for transmitting an image to a specific recipient. Since the transmission and reception of the image are connected by wire or wireless, and other than the reception object can not be received arbitrarily, a closed circuit television do. Background Art [0002] A closed-circuit television basically consists of three parts: an image pickup device, a transmission device, and a display device. Recently, a tendency to add a recording device is increasing.

The field of the closed circuit television system includes a surveillance camera including a CCD or a CMOS imaging device for converting a monitored object into an electrical signal, a video signal switcher for displaying a plurality of camera signals on an arbitrary monitor, And a color quadratic displayer that displays color camera signals on a single monitor. In addition, it has been used as a stand-alone type monitoring control such as building surveillance, factory outside surveillance, parking surveillance, etc. at the time of installation.

A surveillance camera used in a closed-circuit television system is generally called a closed-circuit camera. As described above, the surveillance camera uses an image pickup device such as a CCD or CMOS to convert an image input to the lens into an electrical signal, And transmits a converted electrical signal to a display device such as a monitor.

When such a surveillance camera is used outdoors, a heater is used for the purpose of eliminating the property of the surveillance camera such as a glass or a cover.

1 is a block diagram for explaining the concept of a conventional heater driving apparatus for a surveillance camera.

1, the surveillance camera 10 includes a power supply 11, a network 12, a lens 13, an IR illumination 14 for nighttime surveillance operation, a heater 17 for eliminating the malfunction during low temperature operation . The heater 17 is connected to the power supply 11 through the switch 16 and the operation signal of the switch 16 senses the temperature environment and transmits the sensed temperature. At this time, the heater 17 always consumes the fixed electric power by the designed capacity. Also, the power source 11 may use power over Ethernet (PoE).

Here, Power over Ethernet (PoE) is a framework for the transmission of power from a Power Sourcing Equipment (PSE) to a Powered Device (PD) through Ethernet cabling framework. As shown in Fig. 1, the surveillance camera 10 connected to the network 12 becomes the PD.

As described in the IEEE 802.3af and 802.3at Specification, in a PoE application, a PSE may transmit power to a PD via multiple wire pairs. According to IEEE 802.3af, the PSE can deliver up to 15.4W of power to a single PD through two wire pairs. The power consumption of a network camera using PoE power is 12.95W at maximum, and is specified in the standard (IEEE802.3af). Of course, there is a network camera of high power specification based on IEEE802.3at Specification, but it has limitations such as increase of product price and size increase due to use of large capacity parts in circuit design.

In recent years, the amount of power consumed for video surveillance is basically increasing with the increase of the function and the usability of the surveillance camera. In particular, although the IR LED operating only in the nighttime environment with a light source, the motor used for focusing, and the D / N filter switching motor for day and night are not always used, It is a large part.

Because of these functions and operations, excessive power consumption is used, which means that the maximum power consumed by the heater is limited, which means that the low temperature operation specification is limited.

Korean Public Patent No. 2012-0081814 (2012.07.20. Disclosed) Japanese Unexamined Patent Application Publication No. 2009-135723 (Published Jun. 18, 2009) United States Patent No. 4984089 (published on January 1, 1991)

SUMMARY OF THE INVENTION The present invention provides a heater driving apparatus for a surveillance camera capable of efficiently driving a heater of a surveillance camera installed outdoors within a limited power consumption range.

The problems to be solved by the present invention are not limited to the above-mentioned problems, and other matters not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a heater driving apparatus for a surveillance camera, including: a heater for eliminating damage to a lens of a surveillance camera; A light intensity sensor for sensing light intensity; A detector for sensing a signal level of the illuminance sensor generated according to the illuminance; And a heater controller for controlling a heating value of the heater based on a signal level detected by the detector.

According to another aspect of the present invention, there is provided a heater driving apparatus for a surveillance camera, comprising: a heater for removing a property occurring in a lens unit of a surveillance camera; A temperature sensor for sensing an ambient temperature of the surveillance camera; And a heater controller for turning on the heater when the ambient temperature sensed by the temperature sensor is equal to or lower than a predetermined reference temperature, wherein the heater controller is configured to control the heater controller while the enable signal for operating the assistant function of the surveillance camera is input The heater is turned off.

Other specific details of the invention are included in the detailed description and drawings.

According to the present invention, the heater of the surveillance camera can be efficiently driven within the limited power consumption specification.

In addition, by efficiently driving the heater, it is possible to effectively remove the property such as the lens of the surveillance camera.

In a surveillance camera with a limited amount of power consumption, instantaneous operation such as IR LED or D / N filter and power consumption function are activated, the function of securing the operation stability such as heater is temporarily stopped to secure the margin of consumed power can do.

1 is a block diagram for explaining the concept of a conventional heater driving apparatus for a surveillance camera.
2 is a block diagram illustrating a concept of a heater driving apparatus for a surveillance camera according to an embodiment of the present invention.
FIGS. 3A and 3B are views for explaining an operation in which a light source and a heater are connected in a heater driving apparatus of a surveillance camera according to an embodiment of the present invention.
4 is a diagram showing an example of a circuit configuration in a heater driving apparatus of a surveillance camera according to an embodiment of the present invention.
5 is a block diagram illustrating a concept of a heater driving apparatus for a surveillance camera according to another embodiment of the present invention.
6 is a diagram showing an example of a circuit configuration in a heater driving apparatus of a surveillance camera according to another embodiment of the present invention.
FIG. 7A is a graph showing the power consumed in the case of the heater driving apparatus of the conventional surveillance camera, and FIG. 7B is a graph showing the power consumed in the case of the heater driving apparatus of the surveillance camera according to another embodiment of the present invention to be.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

Although the first, second, etc. are used to describe various elements, components and / or sections, it is needless to say that these elements, components and / or sections are not limited by these terms. These terms are only used to distinguish one element, element or section from another element, element or section. Therefore, it goes without saying that the first element, the first element or the first section mentioned below may be the second element, the second element or the second section within the technical spirit of the present invention.

The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. As used herein, the terms "comprises" and / or "made of" means that a component, step, operation, and / or element may be embodied in one or more other components, steps, operations, and / And does not exclude the presence or addition thereof.

Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs. Also, commonly used predefined terms are not ideally or excessively interpreted unless explicitly defined otherwise.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

2 is a block diagram illustrating a concept of a heater driving apparatus for a surveillance camera according to an embodiment of the present invention.

2, a heater driving apparatus 100 of a surveillance camera according to an exemplary embodiment of the present invention includes a heater 110 for eliminating a property occurring in a lens 105 of a surveillance camera, A heater 130 for sensing the signal level of the illuminance sensor 150 generated according to the illuminance and a controller 140 for controlling the amount of heat generated by the heater 110 based on the signal level detected by the detector 130. [ And a heater controller 115 for controlling the heater. In addition, the heater driving apparatus 100 of the surveillance camera according to the embodiment of the present invention includes a light source 120 that irradiates light for night view shooting of a surveillance camera, A light source controller 125 for controlling the brightness of the light source 120, and a temperature sensor 140 for sensing the ambient temperature of the surveillance camera. Here, the surveillance camera includes a power source 101, a main board 103, a lens 105, and the like.

In the low-temperature environment, the removal efficiency of the lens 105 or the like of the outdoor type surveillance camera is proportional to the capacity of the heater 110. That is, the larger the capacity of the heater 110, the greater the effect of removing the gasses. Therefore, in order to maximize the capacity of the heater 110 within the limited power consumption specification, the heater operation mode at the low temperature operation is improved by using the illumination sensor 150 of the surveillance camera, can do.

Specifically, when the ambient temperature of the surveillance camera sensed by the temperature sensor 140 is below a predetermined temperature, the heater 110 operates. When the ambient illuminance of the surveillance camera sensed by the illuminance sensor 150 is lower than a predetermined illuminance, (120) operates. According to IEEE 802.3af, since the power consumption of the network camera using the PoE power source is maximum 12.95 W, the maximum power of both the heater 110 and the light source 120 can be limited. Here, an IR LED (Infra Red Light Emitting Diode) may be used as the light source 120 for night surveillance. Infrared rays are irradiated by IR LED so that the surveillance camera can shoot in a place without light. At this time, in the case of the light source 120, a difference occurs in the degree of heat generation according to the amount of current, and it may serve the same as the heater for removing heat 110. In particular, in the case of an IR LED, a difference in degree of heat generation depending on the amount of current may occur as a semiconductor device.

The illuminance sensor 150 is used for determining the On / Off point and the amount of current of the light source 120. That is, when the light amount of the light source 120 is insufficient, the illuminance sensor 150 recognizes and drives the IR LED, and adjusts the current supplied to the IR LED according to the amount of light to maintain the brightness at which the subject can be photographed. Therefore, when the signal of the illuminance sensor 150 is interlocked with the heater controller 115 as well as the light source controller 125, the heat generated by the light source 120 and the heat generated by the heater 110 are complementarily supplied The surveillance camera can operate stably in low temperature environment.

FIGS. 3A and 3B are views for explaining an operation in which a light source and a heater are connected in a heater driving apparatus of a surveillance camera according to an embodiment of the present invention.

3A, when the signal level detected by the detector 130 is lower than a predetermined reference level, the light source controller 125 increases the output current to brighten the brightness of the light source 120, and the heater controller 115 The output voltage is reduced to reduce the amount of heat generated by the heater 110. Specifically, the signal from the illuminance sensor 150 is transmitted to the LED driver 128 through the DSP 127 to increase the output current, thereby increasing the brightness of the IR LED and increasing the heat generation amount. Then, the signal from the illuminance sensor 150 is transmitted to the heater controller 115 to lower the voltage supplied to the heater 110, so that the consumed power and the heating value of the heater 110 are reduced.

3B, when the signal level sensed by the detector 130 is higher than a predetermined reference level, the light source controller 125 lowers the output current to darken the brightness of the light source 120, and the heater controller 115 Increases the output voltage and increases the amount of heat generated by the heater 110. Specifically, the signal from the illuminance sensor 150 is transmitted to the LED driver 128 through the DSP 127, thereby lowering the output current, thereby reducing the brightness of the IR LED and reducing the amount of heat generated. Then, the signal of the illuminance sensor 150 is transmitted to the heater controller 115 to raise the voltage supplied to the heater 110, so that the consumed electric power and the heat generation amount of the heater 110 increase.

Therefore, if the light source 120 irradiates light within a limited power consumption range and the heater 110 must be defrosted, i.e., both the light source 120 and the heater 110 are operated within a limited power range The output of the light source 120 and the heater 110 can be appropriately controlled and operated on the basis of the signal from the ambient light sensor 150. The heat generated by the light source 120 and the heat generated by the heater 110 By complementary supply of heat, the surveillance camera can operate stably in low temperature environment.

4 is a diagram showing an example of a circuit configuration in a heater driving apparatus of a surveillance camera according to an embodiment of the present invention.

Referring to FIG. 4, the heater 110 is divided into a heater controller 115 for supplying power to the heater 101 and a detector 130 for discriminating signal levels of the illuminance sensor 150. Here, the heater controller 115 can operate in the same manner as the DC / DC converter.

The detector 130 divides the signal level generated by the illuminance sensor 150 into separate signals according to the ambient light amount of the surveillance camera. The signal generated by the detector 130 is connected to the feedback resistors R1 to R4 which determine the output voltage level of the heater controller 115, respectively. When the amount of ambient light is large, the feedback resistance is made small to lower the voltage supplied to the heater 110, and when the amount of ambient light is small, the feedback resistance is increased to increase the voltage supplied to the heater 110. At this time, only the four resistors R1 to R4 and the transistor elements T1 to T4 are shown in FIG. 4, but it should be apparent to those skilled in the art that the present invention is not limited thereto.

5 is a block diagram illustrating a concept of a heater driving apparatus for a surveillance camera according to another embodiment of the present invention.

5, a heater driving apparatus 200 of a surveillance camera according to another embodiment of the present invention includes a heater 210 for eliminating the malfunction occurring in the lens unit 250 of the surveillance camera, And a heater controller 215 for turning on the heater 210 when the ambient temperature sensed by the temperature sensor 240 is lower than a predetermined reference temperature. The heater driving apparatus 200 of the surveillance camera according to another embodiment of the present invention may further include a light source 120 that irradiates light for night view shooting of the surveillance camera and a light source 120 that emits light based on the signal level sensed by the detector 130 And may include the light source 220. Here, the surveillance camera includes a power source 201, a main board 203, a lens unit 250, a focus motor 205A for auxiliary functions of the lens unit 250, a D / N motor 205B, do.

At this time, the heater controller 215 turns off the heater 210 while the enable signal for operating the auxiliary function of the surveillance camera is input. The enable signal for operating the assistant function of the surveillance camera may include at least one operation signal of the focus operation signal and the D / N operation signal. In addition, And may further include an enable signal. Specifically, when the operation signal of the focus motor 205A is enabled to focus the lens, or the operation signal of the D / N motor 205B for switching the D / N filter according to day and night is enabled, The operation of the heater 210 is restricted by forcibly maintaining the signal generated by the temperature sensor 240 at a low level.

For example, outdoor type surveillance cameras using PoE power have a mix of continuous power consumption and instantaneous or constant power consumption. The part that accepts and transmits the image is a function that continuously consumes power, and the function such as the operation of the focus motor 205A that focuses on is momentary power consumption. If it is limited to the capacity of the heater 210 due to functions that consume power instantaneously, there may be a problem in operation in a low-temperature environment. Therefore, the heater driving device 200 of the surveillance camera according to another embodiment of the present invention may instantaneously The limitation of the heat capacity of the heater 210 can be improved. That is, the heating capacity of the heater 210 can be maximized through the heater driving device 200 of the surveillance camera according to another embodiment of the present invention, so that the surveillance camera can be smoothly operated even in a low-temperature environment.

6 is a diagram showing an example of a circuit configuration in a heater driving apparatus of a surveillance camera according to another embodiment of the present invention.

Referring to FIG. 6, a heater 210 is connected to a power source 201 through a heater controller 215. Here, the heater controller 215 may be implemented as a switch or the like. The heater controller 215 operates when the temperature sensor 240 recognizes the low temperature condition and generates a signal. In a low-temperature environment, the surveillance camera drives the heater 210 together with basic operations such as image capturing and data transmission to secure operational stability. When the enable signal of the operation mode that operates momentarily or only for a predetermined time occurs, such as the operation of the focus motor 205A or the operation of the D / N motor 205B, the enable signal of the operation mode is detected by the temperature sensor 240 Is forcibly maintained at a low level, and the heater 210 is turned off in such a manner that the switch is turned off. The amount of consumed electric power secured by the operation restriction of the heater 210 is used for the instantaneous operation function, and when the enable signal becomes low level after completion of the operation, the heater 210 operates again. The setting of the sequence of the instantaneous operation mode with the heater 210 enables the maximum heating capacity of the heater 210 within a limited power consumption.

The sequence of the heater 210 and the instantaneous operation mode may be applied to other parts of the surveillance camera such as a fan. For example, by limiting the operation mode limit of the fan applied for the purpose of lowering the heat of the surveillance camera, a margin of consumed power can be secured.

FIG. 7A is a graph showing the power consumed in the case of the heater driving apparatus of the conventional surveillance camera, and FIG. 7B is a graph showing the power consumed in the case of the heater driving apparatus of the surveillance camera according to another embodiment of the present invention to be.

Referring to FIG. 7A, since the operation of the heater 210 and the focus motor 205A are not linked, the power consumption of the network camera using the PoE power source is maximum 12.95W, so that the heater 210 consumes about 1.95W It should be operated within the power range.

7B, when the operation of the heater 210 and the focus motor 205A are linked, the heater 210 may operate in a power consumption range of about 3.95 W when the focus motor 205A is not operated Lt; / RTI >

Therefore, the amount of consumed electric power secured due to the operation restriction of the heater 210 is used for the instantaneous operation function. When the enable signal of the focus motor 205A or the like becomes low level after the completion of the operation, the heater 210 operates again . Accordingly, the heater 210 can maximally apply the heat generating capacity of the heater 210 even within a limited power consumption range.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

100: heater driving device of surveillance camera
110: Heater 115: Heater controller
120: light source 125: light source controller
140: temperature sensor 150: illuminance sensor
200: Heater drive of surveillance camera
210: Heater 215: Heater controller
220: light source 240: temperature sensor
250:

Claims (6)

A heater for removing a property occurring in the lens of the surveillance camera;
A light intensity sensor for sensing light intensity;
A detector for sensing a signal level of the illuminance sensor generated according to the illuminance; And
And a heater controller for controlling a heating value of the heater based on a signal level detected by the detector. The method according to claim 1,
A light source for irradiating light for night view photographing of the surveillance camera; And
And a light source controller for controlling the brightness of the light source based on a signal level detected by the detector. 3. The method of claim 2,
Wherein the light source comprises at least one IR LED. 3. The method of claim 2,
When the signal level detected by the detector is lower than a predetermined reference level, the light source controller increases the output current to brighten the brightness of the light source, and the heater controller lowers the output voltage to reduce the heating value of the heater,
When the signal level detected by the detector is higher than a predetermined reference level, the light source controller lowers the output current to darken the brightness of the light source, and the heater controller increases the output voltage to increase the heating value of the heater. Heater driving device. A heater for removing a property occurring in a lens part of the surveillance camera;
A temperature sensor for sensing an ambient temperature of the surveillance camera; And
And a heater controller for turning on the heater when the ambient temperature sensed by the temperature sensor is lower than a predetermined reference temperature,
Wherein the heater controller turns off the heater while an enable signal for operating an auxiliary function of the surveillance camera is input. 6. The method of claim 5,
Wherein the enable signal for operating the assist function includes at least one of a focus operation signal and a D / N operation signal.

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