CN110798611B

CN110798611B - Ultralow-temperature camera and ultralow-temperature starting method of camera

Info

Publication number: CN110798611B
Application number: CN201810879267.0A
Authority: CN
Inventors: 彭雄辉
Original assignee: Hangzhou Hikvision Digital Technology Co Ltd
Current assignee: Hangzhou Hikvision Digital Technology Co Ltd
Priority date: 2018-08-03
Filing date: 2018-08-03
Publication date: 2021-05-14
Anticipated expiration: 2038-08-03
Also published as: CN110798611A

Abstract

The invention discloses an ultralow temperature IPC camera and an ultralow temperature starting method of the camera. The ultra-low temperature IPC camera includes: a relay (1) whose relay switch is turned on by default; the heating module (2) is connected with a power supply through a relay switch of the relay (1). The invention utilizes the chips and devices commonly used in the market to realize the reliable starting of the equipment under the ultralow temperature condition. The scheme of power-on starting does not affect any function of the equipment, almost does not change the structure of the product, greatly saves the development cost and expands the product line. In other words, in the ultra-low temperature starting process, the heating module is directly driven to work under the condition that the single chip microcomputer and the main control chip are not started, and the ultra-low temperature starting performance of the camera is improved.

Description

Ultralow-temperature camera and ultralow-temperature starting method of camera

Technical Field

The invention relates to the technical field of cameras, in particular to an ultralow-temperature camera and an ultralow-temperature starting method of the camera.

Background

At present, there are few models of cameras used in an ultra-low temperature environment (e.g., ultra-low temperature IPC cameras), and such cameras are sold at a high price, but evaluation of use feedback by users is not high. Mainly, in the process of power-on starting of the existing ultralow-temperature camera, the used devices are high in cost and poor in replaceability, mass production is difficult, and equipment is high in maintenance cost due to failure.

At present, the camera supporting the ultra-low temperature power-on starting adopts a power-on starting scheme which is controlled by a mechanical temperature control switch or adopts military-grade ultra-low temperature devices. For example, the power-on start of the ultralow temperature IPC camera is controlled by a mechanical temperature control switch, the logic is simple, but the cost is high, and the price of the mechanical temperature control switch is about 75 dollars. If the military-grade ultralow temperature device is adopted, the performance is reliable, but the volume is large, the cost is high, and the batch production is difficult.

It is therefore desirable to have a solution that overcomes or at least alleviates at least one of the above-mentioned drawbacks of the prior art.

Disclosure of Invention

It is an object of the present invention to provide an ultra-low temperature camera that overcomes or at least alleviates at least one of the above-mentioned disadvantages of the prior art.

The invention solves the technical problem of providing an ultralow temperature camera with low cost and reliable work. In the present invention, the ultra-low temperature means a temperature lower than minus 40 degrees celsius, and the ultra-low temperature camera means a camera capable of being started and operated at a temperature lower than minus 40 degrees celsius.

To achieve the above objects and to solve the above technical problems, the present invention provides an ultra-low temperature camera including:

a relay, a relay switch of which is turned on by default;

and the heating module is connected with a power supply through a relay switch of the relay.

Thus, once the camera is powered up, the heating module is powered up to increase the temperature of the camera by default. And the main control chip does not need to be heated after being started at ultralow temperature.

Preferably, the ultra-low-temperature camera further includes:

micro control unit

A thermistor;

a linear voltage-stabilizing power supply chip connected with the micro control unit and used for supplying power to the micro control unit in an enabled state,

the thermistor controls an enabling end of the linear stabilized voltage power supply, and enables the linear stabilized voltage power supply chip when the temperature of the camera is higher than a first set temperature.

That is to say, through the curve of the thermistor changing along with the temperature and the port which is powered on by default and is conducted on the relay, when the temperature is below-40 ℃, the camera system is not started, and only the heating module works, so that the temperature of the circuit board is improved.

Preferably, the input voltage of the linear voltage-stabilizing power supply chip is divided by a common resistor and a thermistor in series, and then the enable end of the linear voltage-stabilizing power supply chip is powered.

Preferably, the ultra-low-temperature camera includes:

a temperature sensor that detects a camera temperature,

the micro control unit is in communication connection with the temperature sensor, controls a relay switch of the relay according to the temperature of the camera detected by the temperature sensor, and disconnects the relay switch to interrupt power supply to the heating module when the temperature of the camera reaches or exceeds a second set temperature.

Preferably, when the micro control unit sends a high level to the relay, a relay switch of the relay is turned off, interrupting power supply to the heating module.

Preferably, the micro control unit receives the camera temperature detected by the temperature sensor after being powered on, and when the detected camera temperature is greater than or equal to a third set temperature, the micro control unit triggers the DCDC module to supply power to the camera SoC and peripheral circuits thereof of the camera, wherein the second set temperature > the third set temperature > the first set temperature.

Preferably, the relay is a device with an operating temperature of-40 to 150 degrees celsius.

Preferably, the heating module heats the lens, the sensor board and the main board through a heating pad.

Preferably, the temperature sensor is disposed on the main board.

The invention also provides an ultralow temperature starting method of the camera, wherein the camera comprises a relay and a heating module, a relay switch of the relay is conducted by default, the heating module is connected with a power supply through the relay switch of the relay,

when the temperature of the camera is lower than a first set temperature, after the camera is powered on, the power is supplied to the heating module through the relay switch so as to heat the camera;

after the temperature is heated to the first set temperature, the linear voltage-stabilizing power supply chip is started to supply power to the micro-control unit,

and the micro control unit is electrified and then receives the temperature of the camera detected by the temperature sensor, and when the detected temperature of the camera reaches or is higher than a second set temperature, the relay switch is switched off to stop heating the camera.

The invention utilizes the chips and devices commonly used in the market to realize the reliable starting of the equipment under the ultralow temperature condition. The scheme of power-on starting does not affect any function of the equipment, almost does not change the structure of the product, greatly saves the development cost and expands the product line. In other words, in the ultra-low temperature starting process, the heating module is directly driven to work under the condition that the single chip microcomputer and the main control chip are not started, and the ultra-low temperature starting performance of the system is improved.

Drawings

Fig. 1 shows a schematic overall design of the ultra-low temperature camera of the present invention.

Fig. 2 shows a power-on start control flow of the ultra-low temperature video camera of the present invention.

Fig. 3 shows a schematic diagram of a relay circuit for ultra-low temperature start-up.

Fig. 4 is a schematic diagram of a start-up circuit of a linear regulator power supply chip used in the present invention.

Fig. 5 shows a schematic diagram of a micro control unit control circuit employed in the present invention.

Reference numerals:

1	relay with a movable contact	5	Micro control unit
				2	Heating module	6	Temperature sensor
3	Thermal resistor	7	Camera SoC
				4	Linear voltage-stabilizing power supply chip

Detailed Description

In the drawings, the same or similar reference numerals are used to denote the same or similar elements or elements having the same or similar functions. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

The ultralow temperature camera can be applied to ultralow temperature conditions and can be started and operated normally. The ultralow temperature camera of the invention can be an IPC camera and can also be other cameras which need to be used at ultralow temperature. The invention designs an ultra-low temperature camera which can be smoothly powered on and started under the ultra-low temperature condition aiming at the current situation that most of the existing camera products are slowly started or cannot be powered on and started under the ultra-low temperature condition. For example, the IPC camera originally only supporting the power-on starting temperature of over-40 ℃ can be started at lower temperature by simply adding and replacing part of components. For example, the camera may be successfully activated in an environment of-60 degrees celsius. Moreover, the added and replaced parts are all conventional parts, and have the characteristics of small volume and low cost. That is, the present invention provides an ultra-low temperature video camera which is low in cost and reliable in operation.

Referring to fig. 1, the ultra-low temperature camera of the present invention includes: the relay 1, a relay switch of the relay is conducted by default; and the heating module 2 is connected with a power supply through a relay switch of the relay 1. The power supply here includes the commercial power supply, the storage battery power supply, and may also refer to the power plug of the camera, the transformer carried on the camera, etc.

Therefore, under ultralow temperature, once the camera is powered on, even if the control chip is not started, the power supply to the heating module is started so as to improve the temperature of the camera. Therefore, at ultralow temperature, the main control chip does not need to be started and then heated. Thus, the camera of the present invention can be smoothly started at an ambient temperature of-60 degrees centigrade or less. Moreover, the main control chip can be started at ultralow temperature without the main control chip.

As shown, the ultra-low temperature camera further includes: a micro control unit 5, a thermistor 3 and a linear stabilized voltage power supply chip 4. The linear voltage-stabilized power supply chip 4 is connected with the micro control unit 5, and supplies power to the micro control unit 5 in an enabled state. Advantageously, the linear regulated power supply chip 4 steps down the 12V supply voltage to 3.3V to the micro control unit 5.

The linear regulator chip 4 operates in a controlled manner. That is, only at temperatures that reach or exceed the first set temperature. Specifically, the thermistor 3 controls an enable terminal of the linear regulated power supply 4 (i.e., LDO). The linear regulator power chip 4 is enabled when the camera temperature is above (including) a first set temperature (e.g., -40 degrees celsius). The linear voltage-stabilized power supply chip 4 works in an enabling state, and the input voltage of 12V is reduced to 3.3V, and power is supplied to the outside. Specifically, the micro control unit 5(MCU) is powered.

That is to say, through the curve of the thermistor changing along with the temperature and the port which is powered on by default and is conducted on the relay, when the temperature is below-40 ℃, the system is not started, and only the heating module works, so that the temperature of the circuit board is improved. When the temperature is heated to above-40 ℃, the micro control unit 5(MCU) is powered. The micro control unit 5 starts and further starts other devices to start starting the minimum platform of the camera.

More specifically, as shown in fig. 4, the input voltage of the linear regulated power supply chip 4 is divided by a common resistor connected in series with the thermistor 3, and then the enable terminal of the linear regulated power supply chip is powered. In the illustrated embodiment, the series voltage divider circuit includes a conventional resistor R653(6.8K), a thermistor R90(10K, zero degrees centigrade resistance) and a conventional resistor R655(18K) in series. The conventional resistor R655 is grounded, and the voltage difference between two ends of the conventional resistor R655 is used as the enable voltage of the linear voltage-stabilized power supply chip 4, and is connected to the enable end (EN/UV signal end) of the linear voltage-stabilized power supply chip 4 (the device code in fig. 4 is U68). It is noted that the voltage dividing circuit of the present invention is not limited to the embodiment shown in fig. 4. For example, only one conventional resistor may be used in series with the thermistor, and different resistance values may be set as needed.

More specifically, DC12V also passes through the IN terminal of the regulated linear power supply chip, and is divided by a common resistor and a thermistor IN series to obtain the voltage at the enable terminal of the regulated linear power supply chip. The resistance of the thermistor can change along with the change of the environmental temperature. The resistance of the common divider resistor is set by analyzing the temperature curve of the thermistor (the resistance decreases as the temperature increases).

When the temperature is-40 ℃, the voltage value obtained by the enabling end of the linear voltage-stabilizing power supply chip is equal to the minimum enabling voltage, and the linear voltage-stabilizing power supply circuit is in a critical state;

when the temperature is lower than minus 40 ℃, the voltage value obtained by the enabling end of the linear voltage-stabilizing power supply chip is smaller than the minimum enabling voltage, and the linear voltage-stabilizing power supply circuit does not work;

when the temperature is higher than minus 40 ℃, the voltage value obtained by the enabling end of the linear voltage-stabilizing power supply chip is larger than the minimum enabling voltage, and the linear voltage-stabilizing power supply circuit works.

As shown in fig. 1, the ultra-low temperature camera includes a temperature sensor 6. The temperature sensor 6 detects the camera temperature and transmits the detected camera temperature to the micro control unit 5. The temperature sensor 6 may employ any suitable specification parameters. In a preferred embodiment, the temperature sensor 6 is mounted on the main board of the camera. The main board refers to a single board where a main controller (i.e., a camera SoC 7) is located, that is, a single board where a platform minimum system is located. In this way, the temperature of the motherboard can be better detected to determine when the camera SoC 7 can be activated.

The micro-control unit 5 is, for example, an MSP430 chip. The MSP430 series single chip microcomputer is a 16-bit ultra-low power consumption Mixed Signal Processor (Mixed Signal Processor) with Reduced Instruction Set (RISC) which is marketed by Texas Instruments (TI) in the United states in 1996. It is noted that the present invention may also be used with other suitable microprocessors for use as a micro-control unit.

It is also noted that in the present invention, the micro control unit 5 is independent of the main controller of the camera (i.e. the camera SoC 7, also called a camera specific system on board, is usually a single chip), in other words, the micro control unit 5 and the main controller of the camera are two chips. In general, the camera SoC 7 integrates a large number of electronic devices, and conventional functions of various cameras can be realized by combination with peripheral circuits. In an alternative embodiment, the micro control unit 5 can also be integrated in the main controller of the camera, i.e. the camera SoC 7. However, this requires re-development and re-design of the camera SoC 7, which is long in development period and high in cost.

The micro control unit 5 is in communication connection with the temperature sensor 6 and controls the relay switch of the relay 1 according to the camera temperature detected by the temperature sensor 6. When the camera temperature reaches or exceeds a second set temperature (e.g., -40 degrees celsius, or higher), the relay switch is opened, interrupting the power supply to the heating module 2.

In one embodiment, the first set point temperature and the second set point temperature are set to the same temperature, both-40 degrees celsius. It is understood that the first set temperature and the second set temperature may also be set to different temperatures. For example, the second set temperature is set to be slightly higher than the first set temperature, for example, the second set temperature is set to be 1-3 degrees celsius higher than the first set temperature. In another preferred embodiment, the second set temperature is set to be significantly higher than the first set temperature, and the second set temperature is preferably set to be lower than zero degrees. That is, after the micro control unit 5 is started, the heating is continued for a certain period of time. This is advantageous for further improving the low-temperature start-up performance, ensuring that the main controller and its corresponding peripheral circuits are all heated to a temperature at which they can operate properly. In another alternative embodiment, the second set temperature is set equal to or significantly higher than a third set temperature described below.

The above description of "significantly higher" means that the temperature difference is 10 degrees celsius or more. For example, referring to FIG. 2, the first set point temperature is set to-40 degrees Celsius; the second set temperature is set to-15 ℃; the third set point temperature was set to-35 degrees celsius.

It is further advantageous that after the camera has been started and has started working properly, the heating module is powered again if the camera temperature is below the second set temperature. In this way, it is ensured that the internal components of the camera operate at temperatures of around 15 degrees celsius or higher.

It is to be noted that the micro control unit 5 may send a suitable signal to the relay for control. Advantageously, when the micro-control unit 5 sends a high level to the relay 1, the relay switch of the relay 1 is opened, interrupting the power supply to the heating module 2. And if the micro control unit stops starting the high level, the relay switch of the relay returns to the default conduction state to supply power to the heating module.

After the micro control unit 5 is powered on, the camera temperature detected by the temperature sensor 6 is received, and when the detected camera temperature is greater than or equal to a third set temperature (for example, -35 ℃), the micro control unit 5 triggers the DCDC module to supply power to the camera SoC 7 and peripheral circuits thereof, and then the camera can take a picture. Thus, the cold start of the entire camera is completed.

Advantageously, the second set temperature > the third set temperature > the first set temperature.

More specifically, after the micro control unit 5 is powered on, the analog signal of the temperature sensor is collected in real time through the AD sampling interface, and the analog signal is converted into a numerical signal by using an internal AD conversion function, so as to read the temperature in real time. When the read temperature is higher than-35 ℃, the single chip microcomputer adjusts the state of a PWR _ EN signal to be a high level through an I/O pin, a MOS tube is triggered to be conducted, 12V is output, then the power supply is converted into the power supply of 5V, 3.3V, 1.8V and the like required by the platform through a DCDC chip, the minimum system of the platform is enabled to operate, finally the system calls the functions of a PHY chip, audio, alarm, motor drive and the like, and the starting work of the ultralow temperature camera is completed.

The relay 1 is a device with a working temperature of-40 ℃ to 150 ℃. Thus, the ultra-low temperature start function is realized using the conventional relay.

In one embodiment, the heating module 2 heats the lens, the sensor board and the main board through a heating pad, thereby heating the camera key devices more uniformly.

Referring to fig. 2, the present invention further provides an ultra-low temperature starting method for a camera, wherein the camera includes a relay 1 and a heating module 2, a relay switch of the relay 1 is turned on by default, and the heating module 2 is connected to a power supply through the relay switch of the relay 1.

When the temperature of the camera is lower than a first set temperature, after the camera is powered on, power is supplied to the heating module 2 through a relay switch so as to heat the camera;

after the heating to the first set temperature, the linear stabilized voltage power supply chip 4 is started to supply power to the micro control unit 5.

And the micro control unit 5 is electrified to receive the temperature of the camera detected by the temperature sensor 6, and when the detected temperature of the camera reaches or is higher than a second set temperature, the relay switch is switched off to stop heating the camera. The second set temperature is greater than (i.e., higher than) the first set temperature.

Preferably, the relay 1 is a device with an operating temperature of-40 to 150 degrees celsius.

The invention realizes the reliable start and work of the camera under the condition of ultralow temperature by utilizing conventional chips and devices on the market. The scheme of power-on starting does not affect any function of the camera equipment, almost does not change the structure of a product, greatly saves development cost and expands a product line. In other words, in the ultra-low temperature starting process, the heating module is directly driven to work under the condition that the single chip microcomputer and the main control chip are not started, and the ultra-low temperature starting performance of the system is improved.

The ultra-low temperature video camera of the invention is different from the traditional video camera in that the video camera can work in the temperature environment of-60 ℃ or lower, the cost is basically unchanged or slightly increased, and only one MCU chip is added.

The ultralow temperature camera mainly comprises a platform minimum system, a front end plate interface, a PHY chip, an audio frequency, an alarm, a motor driving module, a temperature sensor, an RS485 and the like. The WIFI and GPS modules can be connected to the outside, and therefore the visual function is formed.

The whole camera is powered by DC12V, the default end of the relay is conducted, after the camera is powered on, the heating module works and heats, and the enabling end of the linear stabilized voltage power supply is controlled by the thermistor, so that the singlechip (the micro control unit 5) is guaranteed to work at the temperature of more than-40 ℃. DC12V is implemented, for example, by a transformer carried on a camera power cord connected to a power supply network, for example, to a socket or patch panel. Furthermore, the invention is not limited to DC12V power supply, for example, other safe voltages may be used. In addition, the camera of the present invention may be powered by a power source such as a battery, a dry cell, or the like. For example, an onboard camera is powered by an onboard battery.

After the single chip microcomputer (the micro control unit 5) works, the power on and the power off of the platform are controlled by acquiring the temperature acquired by the temperature sensor. The specific control flow of the power-on start of the ultralow temperature video camera is shown in figure 2.

Through the curve of the thermistor changing along with the temperature and the port which is electrified and communicated by default, when the temperature is below a first set temperature (for example-40 ℃), the camera system is not started, and only the heating module works, so that the temperature of the circuit board and other parts is improved.

When the temperature detected by the thermistor reaches or is higher than-40 ℃, namely the temperature of the environment where the thermistor is located reaches or is higher than the temperature, a high level is generated to trigger the enabling end of the linear voltage-stabilized power supply, the linear voltage-stabilized power supply starts to work, and 3.3V _ MCU is output to supply power to an MCU (single chip microcomputer).

Description of use of related IO interface signals for power-on start of ultralow-temperature IPC camera

The core device in the relay circuit is a HFD3/3-SR relay of the Hongshu company, and the relay switch can be normally switched when the relay is at-40 ℃ to 150 ℃. When the relay is below minus 40 ℃, the

default conducting end

3 and 4 are conducted, and the

default conducting end

9 and 10 are conducted. The circuit has the innovative point that the power-on starting of the ultralow-temperature IPC camera is realized by utilizing the default conducting end of the relay. It will be appreciated that other types of relays may be used, as long as the switches are turned on by default.

The traditional relay controls the heating circuit, the single chip microcomputer is started first when the heating circuit is powered on, and then the single chip microcomputer controls the on-off of the relay, so that the heating module is turned on or off. The relay scheme adopted by the power-on starting of the ultralow-temperature IPC camera is obviously superior to the scheme. In the ultra-low temperature starting process, whether the single chip microcomputer is started or not, the heating module can be directly driven to work, and the reliability of the ultra-low temperature starting of the system is improved.

The invention adopts 3 heaters, and the front end plate is heated to ensure that key devices of the front end plate can work within the temperature range of a chip manual; the lens is heated to ensure that the lens can work in a required temperature range; the heating of the motherboard ensures that critical components of the motherboard can operate within the temperature range of the chip manual.

In fig. 4, the

default terminals

3 and 4 of the relay are conducted, the

terminals

9 and 10 are conducted, and the DC12V is powered on to directly drive the heating module, so that the temperature in the device rises. More specifically, the HFD3/3-SR relay has two relay switches. The invention employs two relays. Two switches of a first relay respectively control heating of a lens and a front end plate (an image sensor plate); two switches of the second relay are connected in parallel and then control heating of the mainboard, so that increased heating current and higher heating power can be provided for the mainboard.

In fig. 4, devices operating at an ultra-low temperature are only CH39, CH41, CH51, CH52, and relays. In fact, at ultra-low temperature, the relay is not considered to work, the relay is only a path for supplying power, and the relay is not required to be capable of receiving a control signal and acting at ultra-low temperature. Thus, relays are common devices that operate at temperatures from-40 degrees Celsius to 150 degrees Celsius. The capacitor is also a common device, and the working temperature is-55 ℃ to 150 ℃. When the equipment starts under the ultra-low temperature environment, 3 end and 4 end through acquiescence of relay switch on, 9 end and 10 end switch on, directly give mainboard and camera lens heating.

When the temperature of the camera, especially the temperature in the cavity, actually the temperature detected by the temperature sensor 6, rises to above-40 ℃, the heating can be disconnected through the instruction of the singlechip and the control circuit of the triode. The triode QD21 works in a cut-off region and a saturation region, when the single chip microcomputer defaults to send no instruction, the voltage of the collector of the triode is low, and the relay works in a default state; when the singlechip sends a high level, the voltage of the collector of the triode is high, the relay is opened, and heating is stopped.

Fig. 3 is a core part of the startup of the ultra-low temperature circuit, and the startup of the linear voltage-stabilizing power supply chip is controlled by a thermistor R90. The core chip of the circuit is LT3042MPDD of Linte company, and the chip can support working at-55 ℃, so that the reliability of power supply is ensured. In addition, a linear voltage-stabilizing power supply chip is adopted, no inductor is needed in the power-on process, and the stability is higher at ultralow temperature.

Fig. 4 shows the interface electrical connection of the linear regulated power supply driving circuit, which is characterized by using a thermistor R90 to control the start of the linear regulated power supply driving circuit compared with the conventional linear regulated power supply driving circuit.

The existing linear voltage-stabilized power supply circuit is generally powered on and controlled by a platform IO control circuit or an RC slow start loop. The platform IO control is adopted, so that the system is started firstly, and the cost of ultralow temperature starting is greatly increased. The RC slow start loop is generally short in control time, in order to ensure that the power-on starting of a linear voltage-stabilized power supply circuit in an ultralow temperature environment is reliable, the time delay is required to be 3 minutes at least, and obviously RC slow start cannot be realized.

The invention adopts the thermistor for starting, changes the resistance value of the thermistor R90 through setting the values of the resistors R653 and R655 and the value of the temperature of the circuit board, and accurately controls the voltage of the linear voltage-stabilized power supply chip EN, thereby controlling the work of the linear voltage-stabilized power supply circuit.

And in the ultra-low temperature starting process, when the temperature in the cavity is below-40 ℃, the heating module heats. When the temperature is below minus 40 ℃, the resistance value of the thermistor is larger than 200K, the voltage division of an EN pin of the linear voltage-stabilizing power supply chip is lower than the minimum enabling voltage, and the linear voltage-stabilizing power supply circuit does not work. When the temperature in the cavity is higher than minus 40 ℃, the resistance value of the thermistor is smaller than 200K, the voltage division of the EN pin of the linear voltage-stabilizing power supply chip is larger than the minimum enabling voltage, the linear voltage-stabilizing power supply circuit works and outputs 3.3V _ MCU to supply power to the MCU.

Detailed description of MCU circuit design principle

The MCU circuit design is one of the core control parts for system power-on startup, and an MSP430FR5739-EP chip of TI company is selected. The chip has the characteristics of strong low-temperature starting capability, high reliability, low power consumption and the like, and is very suitable for the design requirement of the ultralow-temperature camera. The specific design block diagram is shown in fig. 5.

In fig. 5, HEAT _ CTRL is used to control heating of the motherboard, and when high, heating is stopped.

The I2C _ SDA and I2C _ SCL are used for data exchange with the platform, and the function of heartbeat can be realized.

DEBUG _ TXD and DEBUG _ RXD are debugging;

the SENSOR _ HEAT is used for controlling the heating of the SENSOR plate and the lens, and the heating is stopped at a high level;

HEAT _ CTRL motherboard heating control;

DSP _ TEMP is a temperature signal collected by the MCU;

PWR _ EN is a power supply control port of the main platform, and the power supply of the platform is started at a high level;

3.3V _ MCU is used for supplying power to MCU;

MCU _ RST is MCU reset key;

the SBWTCK and the MCU _ RST can be used for updating or downloading programs; TDO, TDI, TMS and TCK are JTAG debug interfaces.

The MCU circuit design in fig. 5 introduces the heartbeat function, and can realize the on-line upgrade of the singlechip program, so that the stability of the system is further improved. The heartbeat function means that the platform can detect whether the program of the single chip microcomputer flies or not, and the single chip microcomputer is forcibly restarted when the program flies, so that the running reliability of the single chip microcomputer can be improved.

The ultralow IPC camera uses the default conducting end of the relay to heat and the thermistor to control the power supply to start, thereby greatly reducing the cost and improving the reliability and the flexibility of equipment. The scheme can be directly applied to cameras or other equipment which are developed and formed and do not support ultra-low temperature, and the application range of the camera or other equipment is expanded, so that the expansion of a product line is realized, the secondary development cost is saved, and the product competitiveness is improved.

Finally, it should be pointed out that: the above examples are only for illustrating the technical solutions of the present invention, and are not limited thereto. Those of ordinary skill in the art will understand that: modifications can be made to the technical solutions described in the foregoing embodiments, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. An ultra-low temperature camera, comprising:

a relay (1) whose relay switch is turned on by default;

the heating module (2) is connected with a power supply through a relay switch of the relay (1);

the relay (1) is a device with the working temperature of-40 ℃ to 150 ℃, and the relay (1) can receive a control signal at the working temperature and is switched from a conducting state to a disconnecting state.

2. The ultra-low-temperature video camera according to claim 1, further comprising:

a micro control unit (5), said micro control unit (5) being capable of sending a signal to said relay (1) for control;

a thermistor (3);

a linear voltage-stabilizing power supply chip (4) which is connected with the micro control unit (5) and supplies power to the micro control unit (5) in an enabling state,

the thermistor (3) controls an enabling end of the linear voltage-stabilized power supply (4), and when the temperature of the camera is higher than a first set temperature, the linear voltage-stabilized power supply chip (4) is enabled.

3. The ultra-low-temperature camera according to claim 2,

the input voltage of the linear voltage-stabilizing power supply chip (4) is connected with the thermistor (3) in series through a common resistor for voltage division, and then the power is supplied to the enabling end of the linear voltage-stabilizing power supply chip.

4. The ultra-low-temperature video camera according to claim 2, comprising:

a temperature sensor (6) that detects a camera temperature,

the micro control unit (5) is in communication connection with the temperature sensor (6), controls a relay switch of the relay (1) according to the camera temperature detected by the temperature sensor (6), and disconnects the relay switch to interrupt power supply to the heating module (2) when the camera temperature reaches or exceeds a second set temperature, wherein the second set temperature is greater than or equal to the first set temperature.

5. The ultra-low-temperature camera according to claim 4,

when the micro control unit (5) sends a high level to the relay (1), the relay switch of the relay (1) is turned off, and the power supply to the heating module (2) is interrupted.

6. The ultra-low-temperature camera according to claim 4,

the micro control unit (5) receives the camera temperature detected by the temperature sensor (6) after being electrified, when the detected camera temperature is more than or equal to a third set temperature, the micro control unit (5) triggers the DCDC module to supply power to a camera SoC (7) and peripheral circuits thereof of the camera,

wherein the second set temperature > the third set temperature > the first set temperature.

7. The ultra-low-temperature camera according to claim 1, wherein the heating module (2) heats the lens, the sensor board and the main board through a heating pad.

8. An ultra-low temperature starting method of a camera is characterized in that,

the camera comprises a relay (1) and a heating module (2), a relay switch of the relay (1) is turned on by default, the heating module (2) is connected with a power supply through the relay switch of the relay (1),

when the temperature of the camera is lower than a first set temperature, after the camera is powered on, the power is supplied to the heating module (2) through the relay switch so as to heat the camera;

after the temperature is heated to the first set temperature, the linear voltage-stabilizing power supply chip is started to supply power to the micro-control unit (5),

the micro control unit (5) is electrified and then receives the temperature of the camera detected by the temperature sensor (6), and when the detected temperature of the camera reaches or is higher than a second set temperature, the relay switch is switched off to stop heating the camera, wherein the second set temperature is larger than or equal to the first set temperature.

9. The camera ultra-low temperature starting method according to claim 8, wherein the relay (1) is a device having an operating temperature of-40 to 150 ℃.

10. The ultra-low temperature starting method of the video camera as claimed in claim 8, wherein the micro control unit (5) receives the camera temperature detected by the temperature sensor (6) after being powered on, when the detected camera temperature is equal to or higher than a third set temperature, the micro control unit (5) triggers the DCDC module to supply power to the camera SoC (7) of the video camera and the peripheral circuits thereof,