CN212569565U - FOD optical detector temperature control module - Google Patents
FOD optical detector temperature control module Download PDFInfo
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- CN212569565U CN212569565U CN202021651573.8U CN202021651573U CN212569565U CN 212569565 U CN212569565 U CN 212569565U CN 202021651573 U CN202021651573 U CN 202021651573U CN 212569565 U CN212569565 U CN 212569565U
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Abstract
The utility model relates to a FOD optical detector field, the technical scheme of adoption is: the FOD optical detector temperature control module comprises a heating plate and a temperature control unit for controlling the heating of the heating plate, wherein the temperature control unit comprises a temperature sampling module, a comparison module, a switch module and an overcurrent protection module; the sampling end of the overcurrent protection module is connected with the output end of the switch module, and the output end of the overcurrent protection module is connected with the input end of the comparison module. The utility model discloses utilize temperature control module to come the work of control heating board according to the temperature, have the leakage current protect function of hot plate, heat the product when low temperature, make the camera normally work, prolong the life-span of camera, realize hot plate circuit fault self-checking simultaneously, the circuit is simple and practical, the interference killing feature is strong.
Description
Technical Field
The utility model relates to a FOD optical detector field, concretely relates to FOD optical detector temperature control module.
Background
Fod (foreign Object debris) is a foreign Object on the ground of an airport runway active area that may damage aircraft, equipment or dangerous airport staff and passengers' life safety.
The FOD optical detector is applied to mixed detection equipment, and the mixed detection equipment comprises radar detection equipment and optical detection equipment, and the working mode has two kinds:
firstly, scanning by using radar detection equipment through transmitting and receiving radio signals to find FOD and determine the position, then feeding back the position information to photoelectric detection equipment, wherein the photoelectric detection equipment identifies the FOD through a photoelectric sensor, and finally identifies and artificially confirms the hazard level of the FOD through software and sends out warning information;
and secondly, directly scanning the FOD by using the wide viewing angle of the photoelectric detection equipment camera, and identifying and confirming the FOD by using the small viewing angle of the camera after finding the FOD.
The FOD optical detector comprises a 4K network high-definition camera and an infrared light supplement lamp module, and can normally work at-32 to +55 ℃ according to the requirement of environmental adaptability, but the normal working temperature of a civil camera selected by the FOD optical detector is from-10 to +60 ℃, so that the conventional FOD optical detector cannot normally work in a low-temperature environment.
Disclosure of Invention
An object of the utility model is to provide a FOD optical detector temperature control module has advantages such as circuit simple and practical, interference killing feature are strong.
In order to realize the purpose of the utility model, the utility model adopts the technical proposal that: the FOD optical detector temperature control module comprises a heating plate and a temperature control unit for controlling the heating of the heating plate, wherein the temperature control unit comprises a temperature sampling module, a comparison module, a switch module and an overcurrent protection module; the sampling end of the overcurrent protection module is connected with the heating plate, and the output end of the overcurrent protection module is connected with the input end of the comparison module.
Preferably, the switch module includes a power circuit, a heating switch and a switch controller, the heating switch is connected in series on the power circuit of the heating plate, an input end of the switch controller is connected with an output end of the comparison module, and an output end of the switch controller is connected with a control end of the heating switch and controls on or off of the heating switch.
Preferably, the overcurrent protection module comprises a current sampling circuit and a current reference circuit, a sampling end of the current sampling circuit is connected with the switch module, an output end of the current sampling circuit is connected with the comparison module, and the current reference circuit is connected with the sampling module.
Preferably, the comparison module comprises a comparator U2, a temperature reference circuit and a hysteresis circuit, the third terminal of the comparator U2 is connected to the temperature sampling module, the second terminal of the comparator U2 is connected to the temperature reference circuit, one end of the hysteresis circuit is connected to the first terminal of the comparator U2, and the other end of the hysteresis circuit is connected to the temperature reference circuit.
Preferably, the temperature sampling module includes a first resistor R1 and a temperature sampling resistor R2, a first end of the first resistor R1 is connected to the power supply circuit, a second end of the first resistor R1 is connected to a first end of the temperature sampling resistor R2 and a third end of the comparator U2, respectively, and a second end of the temperature sampling resistor R2 is grounded.
The beneficial effects of the utility model are concentrated and are embodied in: the utility model discloses utilize temperature control module to come the work of control heating board according to the temperature, have the leakage current protect function of hot plate simultaneously, heat the product when low temperature, make the camera normally work, prolong the life-span of camera, realize hot plate circuit fault self-checking simultaneously, the circuit is simple and practical, the interference killing feature is strong.
Drawings
FIG. 1 is a block diagram of the overall circuit of the present invention;
fig. 2 is a schematic circuit diagram of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 and 2, the temperature control module of the FOD optical detector comprises a heating plate and a temperature control unit for controlling the heating of the heating plate, wherein the heating plate is directly installed inside the FOD optical detector, the temperature control unit comprises a temperature sampling module, a comparison module, a switch module and an overcurrent protection module, an output end of the temperature sampling module is connected with an input end of the comparison module, an output end of the comparison module is connected with an input end of the switch module, the switch module is respectively connected with the heating plate, the comparison module and the temperature sampling module, the temperature signal is converted into an electrical signal by the temperature acquisition module, the comparison module judges whether the temperature value acquired by the temperature acquisition module is lower than or higher than a set value, the switch module receives an output signal of the comparison module and controls the power supply of the heating plate to be switched on or switched off, and a sampling end of, and the output end of the overcurrent protection module is connected with the input end of the comparison module.
Further, the switch module comprises a power circuit, a heating switch Q1 and a switch controller U3, the power circuit is connected with the heating plate through a P2 port, the heating switch is connected in series on a power circuit of the heating plate and used for controlling on/off between the power circuit and the heating plate, an input end of the switch controller U3 is connected with an output end of the comparison module, and an output end of the switch controller Q1 is connected with a control end of the heating switch and used for controlling on/off of the heating switch.
In this embodiment, the power circuit includes a power conversion chip U1, a first filter capacitor C1, and a second filter capacitor C2, an input end of the power conversion chip U1 is connected to a +12V power supply through a P1 port, a +12V power supply P1 is simultaneously used as a power supply input of the heating plate and is connected to a power supply positive terminal of the heating plate, an L78M05 voltage stabilization chip is preferably adopted as the power conversion chip U1, an input end of the power conversion chip U1 is connected to a first end of the first filter capacitor C1, an output end of the power conversion chip U1 is connected to a first end of the second filter capacitor C2, and an output voltage of the power conversion chip U1 is +5V, so as to provide a working power supply for the acquisition module and the comparison module; the second end of the first capacitor C1, the second end of the second capacitor C2 and the ground terminal of the power conversion chip are all grounded.
The heating switch Q1 adopts a MOS field effect transistor, the model of the heating switch Q1 preferably adopts SI2302, the switch controller U3 preferably adopts a one-way AND gate, the model of the switch controller U3 preferably adopts 74HC1G08, the first end of the heating switch Q1 is connected with the fourth end Y of the switch controller, the second end is connected with the overcurrent protection circuit, and the third end is connected with the power supply negative electrode end of the heating plate; and a fifth terminal VCC of the switch controller U3 is connected with the output end of the power conversion chip, and a third terminal GND is grounded.
The temperature sampling module comprises a first resistor R1 and a temperature sampling resistor R2, the temperature sampling resistor R2 preferably adopts an NTC thermistor, the first end of the first resistor R1 is connected with the output end of the power conversion chip U1, the second end of the first resistor R1 is connected with the first end of the temperature sampling resistor R2, and the second end of the temperature sampling resistor R2 is grounded.
The comparison module comprises a comparator U2, a temperature reference circuit and a hysteresis circuit, wherein the temperature reference circuit provides a reference value for temperature detection for the comparator, and the hysteresis circuit is arranged to prevent the comparator from being turned over continuously when approaching a turning point, so that the stability of the output of the comparator U2 is ensured, and the anti-interference capability of the comparator is improved; the third terminal IN/A of the comparator U2 is connected with the second terminal of the first resistor R1, the second terminal IN/A/2 of the comparator U2 is connected with a temperature reference circuit, one end of the hysteresis circuit is connected with the first terminal OUT/A of the comparator U2, and the other end of the hysteresis circuit is connected with the temperature reference circuit.
Specifically, the comparator U2 preferably adopts an LM393 two-way comparator, the temperature reference circuit includes a third resistor R3, a fourth resistor R4 and a fifth resistor R5, a first end of the third resistor R3 is connected to an output end of the power conversion chip U1, a second end of the third resistor R3 is connected to a first end of the fourth resistor R4 and a second end IN/a/2 of the comparator U2, a second end of the fourth resistor R4 is connected to a first end of the fifth resistor R5, and a second end of the fifth resistor R5 is grounded;
a first end OUT/A of the comparator U2 is connected with a first end B of the switch controller U3, a seventh end OUT/B of the comparator U2 is connected with a second end A of the switch controller U3, an eighth end VCC of the comparator U2 is connected with an output end of the power conversion chip U1, and a fourth end GND of the comparator U2 is grounded;
the hysteresis circuit comprises a field effect transistor Q2, preferably of the type SI2302, a first terminal of the field effect transistor Q2 is connected with a first terminal OUT/A of a comparator U2, a third terminal of the transistor Q2 is connected with a second terminal of a fourth resistor R4, and a second terminal of the transistor Q2 is grounded.
The comparison module further comprises a first pull-up resistor R6 and a second pull-up resistor R7 which are respectively connected to the first end OUT/A and the seventh end OUT/B of the comparator U2, the first ends of the first pull-up resistor R6 and the second pull-up resistor R7 are both connected with the output end of the power conversion chip U1, the second end of the first pull-up resistor R6 is connected with the first end OUT/A of the comparator U2, and the second end of the second pull-up resistor R7 is connected with the seventh end OUT/B of the comparator U2.
The overcurrent protection module comprises a current sampling circuit and a current reference circuit, wherein the sampling end of the current sampling circuit is connected with the switch module, the output end of the current sampling circuit is connected with the comparison module, and the current reference circuit is connected with the sampling module;
specifically, the current sampling circuit comprises a third capacitor C3 and an eighth resistor R8, first ends of the third capacitor C3 and the eighth resistor R8 are both connected with a second end of a heating switch Q1, second ends of the third capacitor C3 and the eighth resistor R8 are both grounded, and the second end of the heating switch Q1 is connected with a sixth end IN/B/2 of a comparator;
the current reference circuit comprises an eleventh resistor R11 and a ninth resistor R9, wherein a first end of the eleventh resistor R11 is connected with an output end of the power conversion chip U1, a second end of the eleventh resistor R11 is respectively connected with a fifth end IN/B of the comparator and a first end of the ninth resistor R9, and a second end of the ninth resistor R9 is grounded.
In this embodiment, the temperature sampling resistor R2 is used to detect temperature changes to determine whether to open the heating plate, when the temperature is lower than 0 ℃, the comparator outputs control information to enable the switch controller U3 to output a high level to enable the second end and the third end of the heating switch Q1 to be communicated, at this time, the heating plate is powered on to start working, and the overcurrent protection module monitors whether the working current of the heating plate is abnormal in real time, if the current is abnormal, the comparator outputs a control signal to enable the switch controller U3 to output a low level to enable the heating switch Q1 to be disconnected, the heating plate immediately stops working, and leakage and fire accidents are prevented; under the normal condition of current work, the temperature is gradually increased, and when the temperature is higher than 5 ℃, the heating plate is turned off and the heating is stopped; the above temperature points are all changeable according to the resistance value of the reference circuit.
It should be noted that, for simplicity of description, the above-mentioned embodiments of the method are described as a series of acts or combinations, but those skilled in the art should understand that the present application is not limited by the order of acts described, as some steps may be performed in other orders or simultaneously according to the present application. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and elements referred to are not necessarily required in this application.
Claims (5)
- The FOD optical detector temperature control module is characterized in that: the temperature control unit comprises a temperature sampling module, a comparison module, a switch module and an overcurrent protection module, wherein the output end of the temperature sampling module is connected with the input end of the comparison module, the output end of the comparison module is connected with the input end of the switch module, and the switch module is respectively connected with the heating plate, the comparison module and the temperature sampling module; the sampling end of the overcurrent protection module is connected with the output end of the switch module, and the output end of the overcurrent protection module is connected with the input end of the comparison module.
- 2. The FOD optical detector temperature control module of claim 1, wherein: the switch module comprises a power circuit, a heating switch and a switch controller, wherein the heating switch is connected in series on the power circuit of the heating plate, the input end of the switch controller is connected with the output end of the comparison module, and the output end of the switch controller is connected with the control end of the heating switch and controls the on or off of the heating switch.
- 3. The FOD optical detector temperature control module of claim 2, wherein: the overcurrent protection module comprises a current sampling circuit and a current reference circuit, wherein the sampling end of the current sampling circuit is connected with the switch module, the output end of the current sampling circuit is connected with the comparison module, and the current reference circuit is connected with the sampling module.
- 4. The FOD optical detector temperature control module of claim 2, wherein: the comparison module comprises a comparator U2, a temperature reference circuit and a hysteresis circuit, the third end of the comparator U2 is connected with the temperature sampling module, the second end of the comparator U2 is connected with the temperature reference circuit, one end of the hysteresis circuit is connected with the first end of the comparator U2, and the other end of the hysteresis circuit is connected with the temperature reference circuit.
- 5. The FOD optical detector temperature control module of claim 4, characterized in that: the temperature sampling module comprises a first resistor R1 and a temperature sampling resistor R2, the first end of the first resistor R1 is connected with the power circuit, the second end of the first resistor R1 is connected with the first end of the temperature sampling resistor R2 and the third end of the comparator U2 respectively, and the second end of the temperature sampling resistor R2 is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021651573.8U CN212569565U (en) | 2020-08-10 | 2020-08-10 | FOD optical detector temperature control module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021651573.8U CN212569565U (en) | 2020-08-10 | 2020-08-10 | FOD optical detector temperature control module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212569565U true CN212569565U (en) | 2021-02-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021651573.8U Active CN212569565U (en) | 2020-08-10 | 2020-08-10 | FOD optical detector temperature control module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212569565U (en) |
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2020
- 2020-08-10 CN CN202021651573.8U patent/CN212569565U/en active Active
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