CN212012834U

CN212012834U - Constant temperature control system for front-end window glass of airborne camera protective cover

Info

Publication number: CN212012834U
Application number: CN202021196789.XU
Authority: CN
Inventors: 韩光韬; 王祥; 陈力
Original assignee: Xi'an Shicheng Aviation Technology Co ltd
Current assignee: Xi'an Shicheng Aviation Technology Co ltd
Priority date: 2020-06-24
Filing date: 2020-06-24
Publication date: 2020-11-24
Anticipated expiration: 2030-06-24

Abstract

The application discloses a constant temperature control system for a window glass at the front end of an airborne camera protective cover, which comprises a resistive film, a power supply module, a control module, a first sensor and a second sensor, wherein the resistive film is arranged on the surface of the window glass; the first sensor and the second sensor are respectively in signal connection with the control module through the ADC module, and the second sensor is electrically connected with the resistive film and used for completing temperature acquisition of the surface of the window glass; the control module is in signal connection with the resistive film through the optical coupling module and the MOS tube and is used for completing the control of opening or closing the resistive film; the power module is electrically connected with the MOS tube and used for supplying heating power; the control module is further connected with a defrosting switch through an optical coupling module signal, manual input to the control module signal is completed through the defrosting switch, and then the effect of manually opening the resistive film is achieved, so that the voltage between the two poles of the glass can be automatically adjusted to be 0-28 VDC according to the current environment temperature and the surface temperature of the window glass, the heating power is controlled, quick deicing and demisting are achieved, and the window glass is protected to work in a safe temperature range.

Description

Constant temperature control system for front-end window glass of airborne camera protective cover

Technical Field

The application belongs to the technical field of image data acquisition equipment, and particularly relates to a constant temperature control system for a front-end window glass of an airborne camera protective cover.

Background

In an onboard video device, imaging needs are often needed at low temperature, and in order to ensure the definition of a video, deicing of a window glass at the front end of an onboard camera protective cover becomes an important task. The existing mode with more use is to heat and deice the front end glass of the camera protective cover, the main principle is to heat and deice and demist the surface through the glass, the principle is simple, but the difficulty is taught greatly. If the heating power is too large, the glass surface is heated unevenly and cracked; if the power is too small, the deicing and demisting effects cannot be achieved, the clear shooting of the airborne video equipment is affected, and the device is extremely inconvenient.

SUMMERY OF THE UTILITY MODEL

The problem that the glass surface is heated unevenly and cracked due to overlarge heating power when the front end glass of the protective cover of the existing video recording equipment is defrosted is solved; if the power is too low, the effect of deicing and demisting cannot be achieved;

the application provides a constant temperature control system for a window glass at the front end of an airborne camera protective cover, which comprises a resistive film, a power supply module, a control module, a first sensor and a second sensor, wherein the resistive film is arranged on the surface of the window glass;

the first sensor and the second sensor are respectively in signal connection with the control module through the ADC module, the first sensor is used for completing the collection of the ambient temperature, and the second sensor is electrically connected with the resistive film and is used for completing the temperature collection of the surface of the window glass;

the control module is in signal connection with the resistive film through the optical coupling module and the MOS tube and is used for completing the control of opening or closing the resistive film;

the power module is electrically connected with the MOS tube and used for supplying heating power;

the control module is further connected with a defrosting switch through an optical coupling module in a signal mode, and manual input of signals to the control module is completed through the defrosting switch, so that the effect of manually opening the resistive film is achieved.

Preferably, the resistance of the two poles of the resistive film is 120 Ω, and the resistive film divides the covered area into n equal parts, and the resistance value increases from the middle area of the window glass to the edge area of the window glass.

Preferably, the first sensor and the second sensor are both NTC temperature sensors.

Preferably, the control module is specifically an STM32 singlechip.

Preferably, the power supply module is an output power supply obtained by passing 28VDC on board through a filter and then performing anti-reverse, overvoltage protection and filtering.

Compared with the prior art, the method has the following beneficial technical effects:

this application is through at two temperature sensor of on-board camera protection casing front end window glass thermostatic control, control module with sensor signal connection, and be provided with the resistance film on window glass, control module is according to window glass resistance film resistance value size, glass surface area size, ambient temperature, deicing defogging time sets up the time and the temperature threshold value that glass heated, when window glass resistance value, glass surface area size is confirmed, thermostatic control circuit is according to ambient temperature and window glass surface temperature at that time, the voltage size between the automatically regulated two poles of the earth glass, but the adjustable range is 0 ~ 28VDC, control heating power, realize quick defogging, protection window glass works in safe temperature range.

Drawings

FIG. 1 is a block diagram of a front end windowpane thermostat control system for an onboard camera hood in one embodiment provided herein;

FIG. 2 is a schematic diagram of a resistive film structure of a front end window glass constant temperature control system of an airborne camera shield according to an embodiment of the present application;

description of the reference numerals

The device comprises a resistor film 1, a power supply module 2, a control module 3, a first sensor 4, a second sensor 5, an ADC module 6, an optical coupling module 7, a defrosting switch 8 and an MOS (metal oxide semiconductor) tube 9.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the application usually place when in use, and are used only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

The technical solution of the present application will be explained with reference to specific embodiments.

As shown in fig. 1, a thermostatic control system for a front-end window glass of an onboard camera protective cover comprises a resistive film 1 arranged on the surface of the window glass, a power supply module 2, a control module 3, a first sensor 4 and a second sensor 5;

as shown in fig. 2, in the embodiment, the fused silica glass is selected as the window glass, the fused silica glass has the characteristics of high temperature resistance, high strength and high light transmittance, and meets the use requirement of the window glass at the front end of the protective cover of the airborne camera, the two-pole resistance of the resistive film 1 is 120 Ω, the area covered by the resistive film 1 is subdivided into n equal parts, the resistance values are sequentially increased from the middle area of the window glass to the edge area of the window glass, that is, the resistance of the resistive film 1 is smaller in the middle area of the window glass, and the resistance of the area closer to the edge of the window glass is larger, when heating is performed, the middle heating power of the window glass is large, the. Simultaneously, heat radiating area is little in the middle of the glass, and glass both sides are big with by circle periphery heat radiating area, and the circle periphery laminating protective cover equipment casing of resistive film 1 has further increased the radiating effect, has aggravated protection casing window glass's deicing defrosting effect.

The first sensor 4 and the second sensor 5 are respectively in signal connection with the control module 3 through an ADC module 6, wherein the control module 3 is specifically an STM32 single chip microcomputer, a program module can be preset through the STM32 single chip microcomputer to complete an automatic defrosting and deicing process, the first sensor 4 and the second sensor 5 are both NTC temperature sensors and are used for completing temperature information acquisition, and the NTC temperature sensors are sensitive to negative temperature coefficients and indicate low temperature when the circuit is opened;

the first sensor 4 is used for collecting the ambient temperature, and the second sensor 5 is electrically connected with the resistive film 1 and used for collecting the temperature of the surface of the window glass; the control module 3 is in signal connection with the resistive film 1 through an optical coupling module 7 and an MOS (metal oxide semiconductor) tube 9 and is used for completing the control of opening or closing the resistive film 1; the power module 2 is electrically connected with the MOS tube 9 and used for completing the supply of heating power, and the power module 2 is specifically an output power supply obtained by passing 28VDC on board through a filter and then performing anti-reverse, overvoltage protection and filtering processing;

the control module 3 is further connected with a defrosting switch 8 through an optical coupling module 7 in a signal mode, and manual input of signals to the control module 3 is completed through the defrosting switch 8, so that the effect of manually opening the resistive film 1 is achieved.

Specifically, in the use process, four temperature values T1, T2, T3 and T4 which are sequentially increased are preset in the control module 3, when the environmental temperature acquired by the first sensor 4 is greater than T4, the whole system does not work, and the phenomenon that the temperature of the window glass is too high due to continuous heating of the resistive film 1 after the second sensor 5 is abnormal is avoided;

when the temperature collected by the second sensor is lower than T1, the control module 3 transmits a heating signal to the resistive film 1 through the optical coupling module 7 and the MOS tube 9, the resistive film starts to be heated, the heating is stopped when the temperature reaches T2, the temperature is not heated when the temperature is reduced from T2 to T1, and the heating is restarted until the temperature is reduced to T1.

When the temperature rises from T1 to T2, the defrosting switch 8 does not participate in the system work, when the temperature is higher than T2 and lower than T3, the defrosting switch 8 is manually pressed, a defrosting signal is transmitted through the control module 3, the resistance film 1 is continuously heated for 30s, if the defrosting switch 8 is repeatedly pressed, the heating is restarted for timing, and the heating is stopped after 30s after the defrosting switch 8 is pressed for the last time; if the temperature reaches or exceeds T3 during the 30s defrost cycle with defrost switch 8 pressed, heating is stopped.

Meanwhile, in the process that the temperature is reduced to T1 from T2, or when the temperature is lower than T1, the defrosting switch 8 is pressed, the window glass starts to be heated, and the heating is not timed until the temperature reaches T3 and is stopped.

The embodiments given above are preferable examples for implementing the present application, and the present application is not limited to the above-described embodiments. Any non-essential addition or replacement made by a person skilled in the art according to the technical features of the technical solution of the present application falls within the scope of the present application.

Claims

1. A thermostatic control system for a window glass at the front end of an airborne camera protective cover is characterized by comprising a resistive film (1) arranged on the surface of window glass, a power supply module (2), a control module (3), a first sensor (4) and a second sensor (5);

the first sensor (4) and the second sensor (5) are respectively in signal connection with the control module (3) through an ADC module (6), the first sensor (4) is used for collecting ambient temperature, and the second sensor (5) is electrically connected with the resistive film (1) and used for collecting the temperature of the surface of the window glass;

the control module (3) is in signal connection with the resistive film (1) through the optical coupling module (7) and the MOS tube (9) and is used for completing the control of opening or closing the resistive film (1);

the power module (2) is electrically connected with the MOS tube (9) and is used for supplying heating power;

the control module (3) is further connected with a defrosting switch (8) through the optical coupling module (7) in a signal mode, and signals are manually input to the control module (3) through the defrosting switch (8), so that the effect of manually opening the resistive film (1) is achieved.

2. The thermostatic control system for the front end window glass of the airborne camera shield according to claim 1, characterized in that the resistance of the two poles of the resistive film (1) is 120 Ω, and the resistive film (1) subdivides the covered area into n equal parts, the resistance value increasing in sequence from the middle area of the window glass to the edge area of the window glass.

3. An airborne camera shield front end window glass thermostatic control system according to claim 2, characterized in that the first sensor (4) and the second sensor (5) are both NTC temperature sensors.

4. The thermostatic control system for the front-end window glass of the shield of the airborne camera according to claim 3, characterized in that the control module (3) is specifically an STM32 single chip microcomputer.

5. The thermostatic control system for the front-end window glass of the airborne camera protective cover according to claim 4, characterized in that the power supply module (2) is an output power supply formed by passing 28VDC on the airborne camera through a filter and then performing anti-back, overvoltage protection and filtering processing.