Electronic equipment and control methods for electronic equipment

Abstract

To provide an electronic device that can extend the charging time of the battery while the electronic device is in operation. [Solution] When the temperature of the central processing unit 1 detected by the first temperature sensor 10 is above a first reference temperature, and the temperature of the battery 22 is above a second reference temperature which is higher than the lower limit temperature but lower than the upper limit temperature, the central processing unit 1 rotates the fan 11 at high speed in the forward direction to expel the air heated by the heat generated by the main part to the outside without circulating it around the battery 22. When the temperature of the battery is below the second reference temperature, the central processing unit 1 rotates the fan 11 at high speed in the reverse direction to circulate the air heated by the heat generated by the main part to the outside of the battery 22.

Description

Technical Field

[0001] The present invention relates to an electronic device and a method for controlling the electronic device.

Background Art

[0002] As an example of an electronic device, a drive recorder has become widespread. There is a drive recorder equipped with a battery for parking recording after the accessory power supply of a vehicle is cut off. The drive recorder equipped with a battery needs to charge the battery while being supplied with power from the accessory power supply and shooting and recording the front of the vehicle or the like.

Prior Art Documents

Patent Documents

[0003] <opposite>0000017

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The battery mounted on the drive recorder may be controlled so as not to be charged when the temperature of the battery is lower than a predetermined lower limit temperature or higher than a predetermined upper limit temperature. In winter, the temperature inside the vehicle may be less than 0 degrees, and in summer, the temperature inside the vehicle may be extremely high. Therefore, even when the drive recorder is operating with power supplied from the accessory power supply, the battery may not be charged.

[0005] In an electronic device in which charging is controlled so that the battery is not charged when the temperature of the battery is lower than the lower limit temperature or higher than the upper limit temperature, it is required to make the charging time of the battery during operation of the electronic device as long as possible. An object of the present invention is to provide an electronic device and a method for controlling the electronic device that can increase the charging time during operation of the electronic device.

Means for Solving the Problems

[0006] The present invention provides an electronic device comprising: a main unit including a central processing unit that operates using power supplied from an external power source; a fan for cooling the main unit; a battery; a first temperature sensor for detecting the temperature of the central processing unit; a second temperature sensor for detecting the temperature of the battery; and a charge control unit that controls the charging of the battery using power supplied from the external power source if the temperature of the battery detected by the second temperature sensor is within the range of temperatures within which charging can be started while the main unit is operating, and stops charging the battery if the temperature of the battery detected by the second temperature sensor is below the lower limit temperature or above the upper limit temperature.

[0007] In the electronic device described above, when the temperature of the central processing unit detected by the first temperature sensor is equal to or greater than a first reference temperature, if the temperature of the battery is equal to or greater than a second reference temperature which is higher than the lower limit temperature but lower than the upper limit temperature, the central processing unit rotates the fan at high speed in the forward direction to expel the air heated by the heat generated by the main part to the outside without allowing it to flow around the battery, and if the temperature of the battery is less than the second reference temperature, the central processing unit rotates the fan at high speed in the reverse direction to allow the air heated by the heat generated by the main part to flow around the battery.

[0008] In the electronic device described above, when the temperature of the central processing unit is below the first reference temperature, and the temperature of the battery is above the second reference temperature and above the third reference temperature which is higher than the second reference temperature, the central processing unit rotates the fan at high speed in the forward direction to expel the air heated by the heat generated by the main part to the outside without allowing it to flow around the battery. When the temperature of the battery is above the second reference temperature and below the third reference temperature, the central processing unit rotates the fan at low speed in the forward direction to expel the air heated by the heat generated by the main part to the outside without allowing it to flow around the battery.

[0009] The present invention provides a control method for an electronic device in which a central processing unit in the electronic device acquires the temperature of the central processing unit as detected by a first temperature sensor that detects the temperature of the central processing unit, a charge control unit in the electronic device acquires the temperature of the battery as detected by a second temperature sensor that detects the temperature of the battery in the electronic device, and when the main part of the electronic device, including the central processing unit, which is powered by an external power source, is in operation, the charge control unit starts charging the battery with power supplied by the external power source if the temperature of the battery detected by the second temperature sensor is within the range of temperatures within which charging can be started, and the charge control unit stops charging the battery if the temperature of the battery detected by the second temperature sensor is below the lower limit temperature or above the upper limit temperature.

[0010] In the above-described method for controlling the electronic device, when the temperature of the central processing unit detected by the first temperature sensor is equal to or greater than a first reference temperature, if the temperature of the battery is equal to or greater than a second reference temperature which is higher than the lower limit temperature but lower than the upper limit temperature, the central processing unit rotates a fan for cooling the main part at high speed in the forward direction so as to expel the air heated by the heat generated by the main part to the outside without flowing it around the battery, and if the temperature of the battery is less than the second reference temperature, the fan rotates at high speed in the reverse direction so as to flow the air heated by the heat generated by the main part to the outside of the battery.

[0011] In the above-described method for controlling electronic equipment, the central processing unit rotates the fan at high speed in the forward direction when the temperature of the central processing unit is below the first reference temperature, and the temperature of the battery is above the second reference temperature and above the third reference temperature which is higher than the second reference temperature, so as to expel the air heated by the heat generated by the main part to the outside without letting it flow around the battery. If the temperature of the battery is above the second reference temperature and below the third reference temperature, the fan rotates at low speed in the forward direction so as to expel the air heated by the heat generated by the main part to the outside without letting it flow around the battery. [Effects of the Invention]

[0012] According to the electronic device and control method of the present invention, the charging time of the battery while the electronic device is in operation can be extended. [Brief explanation of the drawing]

[0013] [Figure 1] Figure 1 is a block diagram showing an example configuration of a drive recorder, which is an example of an electronic device according to one embodiment. [Figure 2A] Figure 2A shows the fan of the dashcam shown in Figure 1 in the forward rotation position. [Figure 2B] Figure 2B shows the fan of the dashcam shown in Figure 1 rotating in reverse. [Figure 3] Figure 3 is a flowchart showing the battery charging control process performed by the charging control unit of the drive recorder shown in Figure 1. [Figure 4] Figure 4 is a flowchart showing the fan rotation control process performed by the central processing unit of the drive recorder shown in Figure 1. [Figure 5A] Figure 5A shows an example of the rotational speed when the central processing unit rotates the fan in the forward direction at a low speed. [Figure 5B] Figure 5B shows an example of the rotational speed when the central processing unit rotates the fan in the forward direction at high speed. [Figure 6A] Figure 6A shows an example of the change in rotational speed when the central processing unit reverses the rotation of the fan in the first reverse rotation mode. [Figure 6B] Figure 6B shows an example of the change in rotational speed when the central processing unit reverses the rotation of the fan in a second reverse rotation mode. [Figure 7] Figure 7 is a diagram that shows the rotation speed when the central processing unit rotates the fan forward or backward depending on the temperature of the central processing unit or the battery, and the reverse rotation mode when the fan rotates backward. [Modes for carrying out the invention]

[0014] Hereinafter, an electronic device and a control method for the electronic device according to an embodiment will be described with reference to the accompanying drawings. An embodiment to be described in detail below takes the case where the electronic device is a drive recorder as an example. The electronic device is not limited to a drive recorder.

[0015] As shown in FIG. 1, the drive recorder 100 includes a central processing unit (hereinafter abbreviated as CPU) 1, a camera 2, an A / D converter 3, an image determination unit 4, a memory card 5, a D / A converter 6, a speaker 7, a display unit 8, a shock sensor 9, a temperature sensor 10 (first temperature sensor), a fan 11, a charge control unit 21, a battery 22, and a temperature sensor 23 (second temperature sensor). When the drive recorder 100 is connected to the accessory power supply 31 of the vehicle and power is supplied to the drive recorder 100 from the accessory power supply 31, the drive recorder 100 operates. The accessory power supply 31 is an example of an external power supply.

[0016] At least the CPU 1, A / D converter 3, image determination unit 4, temperature sensor 10, and charge control unit 21 in FIG. 1 are provided on a substrate 12 disposed within the housing 101 of the drive recorder 100 shown in FIGS. 2A and 2B. The fan 11 is disposed on a side closer to the outside than the substrate 12 within the housing 101. The battery 22 is disposed at a position away from the substrate 12 within the housing 101. The temperature sensor 23 is disposed on the upper surface of the battery 22 to detect the temperature of the battery 22. The temperature sensor 23 can be configured by, for example, a thermistor. The temperature of the battery 22 detected by the temperature sensor 23 is supplied to the CPU 1 and the charge control unit 21. The CPU 1 and the charge control unit 21 acquire the temperature of the battery 22.

[0017] The camera 2 captures the front of the vehicle and supplies an image signal to the A / D converter 3. The vehicle may further include a camera that captures the rear of the vehicle or a camera that captures the inside of the vehicle. The image data converted into a digital signal by the A / D converter 3 is supplied to the image determination unit 4 and the CPU 1. As a safety driving support function, the image determination unit 4 detects departure from the vehicle's lane based on the input image data, or detects a driver's drowsiness, looking aside, etc. when the vehicle further includes a camera that captures the inside of the vehicle. The image determination unit 4 may support safe driving using artificial intelligence (AI). It is not essential for the drive recorder 100 to include the image determination unit 4.

[0018] The CPU 1 encodes the image data supplied from the A / D converter 3, for example, using the compression encoding method of MPEG-4 AVC (H.264), and stores it in the memory card 5. An integrated circuit for compression encoding may be provided outside the CPU 1. During the operation of the drive recorder 100, the CPU 1 always stores the captured image by the camera 2 in the memory card 5. The impact sensor 9 is, for example, an acceleration sensor. When an impact is applied to the vehicle and the impact sensor 9 detects the impact, the CPU 1 stores the captured image by the camera 2 in a non-overwriteable area in the memory card 5.

[0019] Although not shown in FIG. 1, the drive recorder 100 includes a microphone, and the memory card 5 stores not only the captured image by the camera 2 but also the sound picked up by the microphone. The speaker 7 outputs a reproduced voice when the voice stored in the memory card 5 is reproduced, based on an analog voice signal obtained by converting the reproduced voice into an analog signal by the D / A converter 6. Also, the speaker 7 may output a voice for supporting safe driving generated by the CPU 1, based on an analog voice signal obtained by converting the voice into an analog signal by the D / A converter 6.

[0020] The display unit 8 displays the captured image by the camera 2. When the captured image stored in the memory card 5 is reproduced, the display unit 8 displays the reproduced captured image according to the control by the CPU 1. The display unit 8 is, for example, a liquid crystal display.

[0021] The temperature sensor 10 detects the temperature of the CPU 1. The temperature of the CPU 1 detected by the temperature sensor 10 is supplied to the CPU 1, and the CPU 1 obtains its temperature. The temperature sensor 10 may be located inside the CPU 1 and detect the internal temperature of the CPU 1. The CPU 1 also functions as a fan control unit that controls the rotation of the fan 11 according to the temperature of the CPU 1 detected by the temperature sensor 10, or the temperature of the battery 22 detected by the temperature sensor 23. The CPU 1 controls the rotation speed of the fan 11 by making it rotate forward or backward.

[0022] In the drive recorder 100 configured as described above, at least the CPU 1 is considered the main part that operates using power supplied from an external power source (accessory power supply 31). The CPU 1 and the image determination unit 4 may be the main parts, or the entire circuit board 12 may be the main parts. When the drive recorder 100 operates using power supplied from the accessory power supply 31, the main parts generate heat. In particular, if the drive recorder 100 is equipped with an image determination unit 4 to support safe driving, the amount of heat generated is large, and furthermore, if the image determination unit 4 uses AI to support safe driving, the amount of heat generated is very large.

[0023] In Figures 2A and 2B, solid arrows indicate the flow of air heated by the heat generated by the main components, while dashed arrows indicate the flow of air not heated by the heat generated by the main components. The housing 101 has an opening 102 near the fan 11 and an opening 103 near the battery 22. Figure 2A shows the fan 11 rotating in the forward direction, discharging air heated by the heat generated by the main components to the outside of the housing 101 through opening 102 and drawing in air through opening 103. When the fan 11 is rotating in the forward direction, the air heated by the heat generated by the main components is discharged to the outside without flowing around the battery 22. Figure 2B shows the fan 11 rotating in the reverse direction, directing air around the circuit board 12, which has been heated by the heat generated by the main components, towards the battery 22.

[0024] The flowchart shown in Figure 3 explains how the charging control unit 21 controls the charging of the battery 22. In Figure 3, when power is supplied from the accessory power supply 31 to the charging control unit 21, the charging control unit 21 starts processing. In step S1, the charging control unit 21 determines whether the temperature of the battery 22 is within the charging start temperature range. For example, if the battery 22 is a nickel-metal hydride battery, the charging start temperature range is 0 degrees Celsius or higher and 45 degrees Celsius or lower. That is, if the temperature of the battery 22 is below 0 degrees Celsius or above 45 degrees Celsius, the charging control unit 21 will not start charging the battery 22.

[0025] If the temperature of the battery 22 in step S1 is not within the charging start temperature range (NO), the charging control unit 21 repeats the process of step S1. If the temperature of the battery 22 in step S1 is within the charging start temperature range (YES), the charging control unit 21 starts charging the battery 22 in step S2.

[0026] In step S3, the charging control unit 21 determines whether the temperature of the battery 22 is below the lower limit temperature of 0 degrees. If the temperature of the battery 22 is below 0 degrees (YES), the charging control unit 21 stops charging the battery 22 in step S6 and proceeds to step S7. The lower limit temperature of 0 degrees is just an example. If the temperature of the battery 22 is not below the lower limit temperature (NO), the charging control unit 21 determines in step S4 whether the temperature of the battery 22 is above the upper limit temperature of 60 degrees. If the temperature of the battery 22 is above 60 degrees (YES), the charging control unit 21 stops charging the battery 22 in step S6 and proceeds to step S7. The upper limit temperature of 60 degrees is just an example.

[0027] The lower limit temperature of 0 degrees in step S3 and the upper limit temperature of 60 degrees in step S4 are temperatures used to determine whether to stop or continue charging the battery 22 after charging the battery 22 has started when its temperature is between 0 degrees and 45 degrees. Here, the lower limit temperature of the charging start temperature range when starting to charge an uncharged battery 22 and the lower limit temperature when stopping charging a charging battery 22 are both set to a common 0 degrees, but these temperatures may be different.

[0028] If the temperature of the battery 22 is not below 0 degrees in step S3 (NO) and is not 60 degrees or higher in step S4 (NO), the charging control unit 21 charges the battery 22 in step S5 and proceeds to step S7. In step S7, the charging control unit 21 determines whether the accessory power supply 31 has been turned off. If the accessory power supply 31 has not been turned off (NO), the charging control unit 21 repeats the process from step S2 onwards. If the accessory power supply 31 has been turned off (YES), the charging control unit 21 terminates the process.

[0029] The flowchart shown in Figure 4 explains how the CPU 1 controls the rotation of the fan 11 as the fan control unit. In Figure 4, when power is supplied from the accessory power supply 31 to the CPU 1, the CPU 1 starts processing.

[0030] In Figure 4, in step S11, CPU1 determines whether its temperature is below 80 degrees. 80 degrees is an example of a first reference temperature. If the temperature of CPU1 is below 80 degrees (YES), CPU1 determines in step S12 whether the temperature of battery 22 is below 10 degrees. 10 degrees is an example of a second reference temperature that is above the lower limit temperature and below the upper limit temperature. If the temperature of battery 22 is not below 10 degrees (NO), there is no need to warm the battery 22, and CPU1 rotates fan 11 forward in step S13.

[0031] Next, in step S14, CPU1 determines whether the temperature of the battery 22 is below 55 degrees. 55 degrees is an example of a third reference temperature that is higher than the second reference temperature. If the temperature of the battery 22 is below 55 degrees (YES), CPU1 rotates the fan 11 at a low speed in step S15 and proceeds to step S24. Since the temperature of the battery 22 is not very high, it is sufficient to rotate the fan 11 at a low speed in the forward direction.

[0032] If the temperature of the battery 22 is not below 55 degrees in step S14 (NO), then in step S16, the CPU 1 rotates the fan 11 at high speed and proceeds to step S24. Low speed and high speed in the rotation of the fan 11 refer to relative rotation speeds. Rotating the fan 11 at low speed means rotating it at a lower rotation speed than when the fan 11 is rotating at high speed, and rotating the fan 11 at high speed means rotating it at a higher rotation speed than when the fan 11 is rotating at low speed.

[0033] When fan 11 is rotating in the forward direction at low speed, the rotation speed is, for example, 3500 rpm, as shown in Figure 5A. When fan 11 is rotating in the forward direction at high speed, the rotation speed is, for example, 7000 rpm, as shown in Figure 5BA. When the temperature of battery 22 is relatively high, above 55 degrees Celsius, CPU 1 can lower the temperature of battery 22 in a shorter time than when fan 11 is rotating in the forward direction at low speed by rotating fan 11 at high speed.

[0034] If the temperature of battery 22 is below 10 degrees in step S12 (YES), then it is better to warm up battery 22, so CPU1 reverses the rotation of fan 11 in step S17.

[0035] Next, in step S18, CPU1 determines whether the temperature of the battery 22 is less than 5 degrees. 5 degrees is an example of a fourth reference temperature that is lower than the second reference temperature. If the temperature of the battery 22 is not less than 5 degrees (NO), CPU1 reverses the rotation of the fan 11 in the first reverse rotation mode in step S19 and proceeds to step S24. If the temperature of the battery 22 is less than 5 degrees (YES), CPU1 reverses the rotation of the fan 11 in the second reverse rotation mode in step S20 and proceeds to step S24.

[0036] Figure 6A shows the first reverse rotation mode. As shown in Figure 6A, in the first reverse rotation mode, for example, a 20-second period with a low rotation speed of 3500 rpm and a 10-second period with a high rotation speed of 7000 rpm are alternately repeated. Figure 6B shows the second reverse rotation mode. In the second reverse rotation mode, for example, a 50-second period with an even lower rotation speed of 2000 rpm and a 10-second period with a high rotation speed of 7000 rpm are alternately repeated.

[0037] In both the first and second reverse rotation modes, when the CPU1 reverses the rotation of the fan 11, it alternately repeats the following actions: rotating the fan 11 at a low speed for a predetermined time, and rotating the fan 11 at a high speed for a time shorter than that predetermined time.

[0038] In detail, CPU1 alternately controls fan 11 to rotate in reverse at a low speed for a first time, and to rotate in reverse at high speed for a second time, which is shorter than the first time, as a first reverse rotation mode.CPU1 alternately controls fan 11 to rotate in reverse at an even lower speed than the low speed in the first reverse rotation mode for a third time, which is longer than the first time, and to rotate in reverse at high speed for a fourth time, which is shorter than the third time.Here, the fourth time is the same as the second time, but it may be different from the second time.

[0039] In the first reverse rotation mode, during the 20 seconds when the fan 11 is rotated in reverse at a low speed, the air heated by the heat generated by the main components flows slowly around the battery 22, so heated air tends to accumulate around the main components. During the 10 seconds when the fan 11 is rotated in reverse at high speed, the accumulated heated air flows rapidly around the battery 22, warming the battery 22.

[0040] In the second reverse rotation mode, the fan 11 rotates in reverse at a low speed for a longer period, and at an even lower speed than in the first reverse rotation mode. As a result, the air heated by the heat generated by the main components tends to accumulate more easily near the main components. During the 10 seconds when the fan 11 rotates in reverse at high speed, the more accumulated heated air flows rapidly around the battery 22, warming it more effectively.

[0041] Returning to Figure 4, if the temperature of CPU1 is not less than 80 degrees in step S11 (NO), CPU1 determines in step S21 whether the temperature of battery 22 is less than 10 degrees. If the temperature of battery 22 is not less than 10 degrees (NO), CPU1 rotates fan 11 at high speed in the forward direction in step S22 and moves the process to step S24. If the temperature of battery 22 is less than 10 degrees (YES), CPU1 rotates fan 11 at high speed in the reverse direction in step S23 and moves the process to step S24. The high speed of the reverse rotation in step S23 may be the same as or different from the high speed of the forward rotation in steps S16 and S22.

[0042] In step S24, CPU1 determines whether the accessory power supply 31 has been turned off. If the accessory power supply 31 is not turned off (NO), CPU1 repeats the process from step S11 onwards. If the accessory power supply 31 is turned off (YES), CPU1 terminates the process.

[0043] Figure 7 shows the rotation speed when the CPU1 rotates the fan 11 forward or in reverse as shown in Figure 4, and the reverse rotation mode when the fan 11 rotates in reverse.

[0044] As described above, the drive recorder 100, which is an electronic device according to one embodiment, includes a main unit that operates on power supplied from an external power source, a fan 11 for cooling the main unit, a battery 22, a temperature sensor 23 for detecting the temperature of the battery 22, a charging control unit 21, and a CPU 1 as a fan control unit.

[0045] When the main unit is operating, the charging control unit 21 starts charging the battery 22 using power supplied from an external power source if the temperature of the battery 22 detected by the temperature sensor 23 is within the range of temperatures at which charging can be started. The charging control unit 21 controls the charging of the battery 22 to stop if the temperature of the battery 22 detected by the temperature sensor 23 is below the lower limit temperature (0°C) or above the upper limit temperature (60°C).

[0046] When the temperature of the battery 22 is above a predetermined reference temperature (e.g., 80 degrees Celsius) that is above the lower limit temperature and below the upper limit temperature, CPU1 rotates fan 11 in the forward direction to expel the air heated by the heat generated by the main components to the outside without circulating it around the battery 22. When the temperature of the battery 22 is below the reference temperature, CPU1 rotates fan 11 in the reverse direction to circulate the air heated by the heat generated by the main components around the battery 22.

[0047] As a result, according to the electronic device and control method of the electronic device according to one embodiment, the time during which the battery 22 is below the lower limit temperature of 0 degrees or above the upper limit temperature of 60 degrees can be shortened, and the charging time of the battery 22 while the electronic device is operating can be extended.

[0048] The drive recorder 100 further includes a temperature sensor 10 for detecting the temperature of the CPU 1. The CPU 1 preferably controls the fan 11 as follows, depending on the temperature of the CPU 1 and the temperature of the battery 22. First, the temperature of the CPU 1 detected by the temperature sensor 10 is above a first reference temperature (80°C), and the temperature of the battery 22 is above a second reference temperature (10°C), which is higher than the lower limit temperature (0°C) and lower than the upper limit temperature (60°C). At this time, the CPU 1 rotates the fan 11 at high speed in the forward direction so that the air heated by the heat generated by the main components is expelled to the outside without flowing around the battery 22.

[0049] Assume that the temperature of CPU1 is above the first reference temperature (80°C) and the temperature of battery22 is below the second reference temperature (10°C). At this time, CPU1 rotates fan11 in reverse at high speed to circulate the air heated by the heat generated by the main components towards the battery22.

[0050] Assume that the temperature of CPU1 is below the first reference temperature (80°C), and the temperature of battery22 is above the second reference temperature (10°C) and above the third reference temperature (55°C), which is higher than the second reference temperature. In this case, CPU1 rotates fan11 at high speed in the forward direction to expel the air heated by the heat generated by the main components to the outside without letting it flow around the battery22. Assume that the temperature of CPU1 is below the first reference temperature (80°C), and the temperature of battery is above the second reference temperature (10°C) and below the third reference temperature (55°C). In this case, CPU1 rotates fan11 at low speed in the forward direction to expel the air heated by the heat generated by the main components to the outside without letting it flow around the battery22.

[0051] Assume that the temperature of CPU1 is below the first reference temperature (80°C), and the temperature of battery 22 is below the second reference temperature (10°C) and above the fourth reference temperature (5°C), which is lower than the second reference temperature (10°C). In this case, CPU1 rotates fan 11 in the first reverse rotation mode to circulate the air heated by the heat generated by the main components around battery 22. Assume that the temperature of CPU1 is below the first reference temperature (80°C), and the temperature of battery 22 is below the second reference temperature (10°C) and below the fourth reference temperature (5°C). In this case, CPU1 rotates fan 11 in the second reverse rotation mode, which is different from the first reverse rotation mode, to circulate the air heated by the heat generated by the main components around battery 22.

[0052] According to a preferred electronic device and control method of an electronic device according to one embodiment, the rotation direction, rotation speed, and reverse rotation mode of the fan 11 for cooling the main parts including the CPU 1 can be appropriately controlled according to the combination of the temperature of the CPU 1 and the temperature of the battery 22. Therefore, according to the preferred electronic device and control method of an electronic device, the charging time of the battery 22 while the electronic device is operating can be extended, and the temperature of the CPU 1 can be appropriately controlled.

[0053] The present invention is not limited to the embodiments described above, and various modifications are possible without departing from the spirit of the invention. [Explanation of symbols]

[0054] 1. Central Processing Unit 2 cameras 3 A / D converters 4 Image determination unit 5. Memory card 6 D / A Converters 7 speakers 8 Display 9. Impact Sensor 10 Temperature Sensor 11 Fans 12 circuit boards 21 Charging Control Unit 22 Batteries 23 Temperature Sensor 31 Accessory Power Supply 100 Dashcams 101 cabinets 102,103 aperture

Claims

1. The main unit includes a central processing unit that operates using power supplied from an external power source, A fan for cooling the main part, Battery and A first temperature sensor for detecting the temperature of the central processing unit, A second temperature sensor for detecting the temperature of the battery, A charging control unit controls the following when the main unit is operating: if the temperature of the battery detected by the second temperature sensor is within the range of temperatures within which charging can be started, charging of the battery is started using power supplied from the external power supply; and if the temperature of the battery detected by the second temperature sensor is below the lower limit temperature or above the upper limit temperature, charging of the battery is stopped. Equipped with, The central processing unit is When the temperature of the central processing unit detected by the first temperature sensor is equal to or greater than the first reference temperature, If the temperature of the battery is above a second reference temperature which is higher than the lower limit temperature but lower than the upper limit temperature, the fan is rotated at high speed in the forward direction to expel the air heated by the heat generated by the main part to the outside without circulating it around the battery. If the temperature of the battery is below the second reference temperature, the fan is rotated in reverse at high speed to circulate the air heated by the heat generated by the main part around the battery. When the temperature of the central processing unit is below the first reference temperature, If the temperature of the battery is above the second reference temperature, and above a third reference temperature which is higher than the second reference temperature, the fan is rotated in the forward direction at high speed to expel the air heated by the heat generated by the main part to the outside without flowing it around the battery. If the battery temperature is above the second reference temperature but below the third reference temperature, the fan is rotated in the forward direction at a low speed to expel the air heated by the heat generated by the main components to the outside without allowing it to flow around the battery. electronic equipment.

2. The central processing unit is If the temperature of the battery is below the second reference temperature and above a fourth reference temperature that is lower than the second reference temperature, the fan is rotated in the first reverse rotation mode to circulate the air heated by the heat generated by the main part around the battery. If the battery temperature is below the second reference temperature and below the fourth reference temperature, the fan is rotated in a second reverse rotation mode, different from the first reverse rotation mode, to circulate the air heated by the heat generated by the main components around the battery. The electronic device according to claim 1.

3. The central processing unit is As the first reverse rotation mode, the fan is controlled to rotate in reverse at a low speed for a first time, and then controlled to rotate in reverse at a high speed for a second time that is shorter than the first time, and this process is repeated alternately. As the second reverse rotation mode, the fan is controlled to rotate in reverse at an even lower speed than the low speed in the first reverse rotation mode for a third time that is longer than the first time, and to rotate in reverse at high speed for a fourth time that is shorter than the third time and is the same as or different from the second time, and these controls are repeated alternately. The electronic device according to claim 2.

4. The central processing unit of the electronic device acquires the temperature of the central processing unit detected by a first temperature sensor that detects the temperature of the central processing unit, The charging control unit of the electronic device acquires the battery temperature detected by a second temperature sensor that detects the battery temperature of the electronic device, When the main components of the electronic device, including the central processing unit, which operates using power supplied from an external power source, are in operation, the charge control unit starts charging the battery using power supplied from the external power source if the temperature of the battery detected by the second temperature sensor is within the range of temperatures within which charging can be started. The charging control unit stops charging the battery if the battery temperature detected by the second temperature sensor is below the lower limit temperature or above the upper limit temperature. The central processing unit is When the temperature of the central processing unit detected by the first temperature sensor is equal to or greater than the first reference temperature, If the temperature of the battery is above a second reference temperature which is higher than the lower limit temperature but lower than the upper limit temperature, the fan for cooling the main part is rotated at high speed in the forward direction so that the air heated by the heat generated by the main part is expelled to the outside without being circulated around the battery. If the temperature of the battery is below the second reference temperature, the fan is rotated in reverse at high speed to circulate the air heated by the heat generated by the main part around the battery. When the temperature of the central processing unit is below the first reference temperature, If the temperature of the battery is above the second reference temperature, and above a third reference temperature which is higher than the second reference temperature, the fan is rotated in the forward direction at high speed to expel the air heated by the heat generated by the main part to the outside without flowing it around the battery. If the battery temperature is above the second reference temperature but below the third reference temperature, the fan is rotated in the forward direction at a low speed to expel the air heated by the heat generated by the main components to the outside without allowing it to flow around the battery. A method for controlling electronic devices.

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