Solar powered mobile phone charger with overheat alarm
By integrating temperature detection and alarm functions in the charging device of solar mobile phones, the problem of overheating and spontaneous combustion of mobile phones caused by the lack of overheating alarms in the prior art is solved, and higher safety and reliability are achieved.
Patent Information
- Application Number
- CN202421408742.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-19
- Publication Date
- 2025-04-11
- Estimated Expiration
- 2034-06-19
AI Technical Summary
Existing solar cell phone charging devices lack overheating alarm function, resulting in an increased risk of overheating and spontaneous combustion of mobile phones during charging.
A solar cell phone charging device including a solar panel, a charging output interface, an indication alarm unit and a temperature detection unit are designed. The temperature detection unit detects the temperature of the mobile phone through the thermistor and temperature judgment module, and is electrically connected to the indicator alarm unit. If the temperature of the mobile phone is detected to be too high, the alarm module will be activated to convey information about the excessive temperature to the user.
Through the temperature detection and alarm functions, the device can promptly warn users that the temperature of the mobile phone is too high, reduce the risk of spontaneous combustion of the mobile phone, and improve the safety and reliability of the charging process.
Smart Images
Figure CN222750187U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of mobile phone charging, in particular to a solar mobile phone charging device with an overheat alarm function. Background Art
[0002] In modern society, mobile phones have become an indispensable part of people's lives. They are not only a communication tool, but also a carrier for people to obtain information, entertainment, and social interaction. Whether at home, work or social occasions, mobile phones have become an important tool for people to keep in touch. Through mobile phones, people can keep in touch with relatives, friends, colleagues or customers anytime and anywhere to ensure timely delivery and communication of information. Whether it is news, weather, stock market information or various application software, mobile phones can easily obtain them. Through mobile phones, people can obtain the required information anytime and anywhere in order to better plan their lives and work. At present, mobile phone charging mainly relies on city electricity, and charging is subject to local restrictions. Therefore, a solar mobile phone charging device began to appear in the public's field of vision; solar mobile phone charging devices require a certain amount of sunlight to generate sufficient current, and a large amount of heat will be generated during the charging process; however, common mobile phone charging devices do not have overheating alarms, and mobile phones often catch fire. Utility Model Content
[0003] 1. Technical issues to be resolved
[0004] Aiming at the problem that the solar cell phone charging device in the prior art cannot detect whether the charged cell phone is overheated, the utility model provides a solar cell phone charging device with an overheat alarm function.
[0005] (II) Technical solution
[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a solar mobile phone charging device with an overheat alarm function, comprising a solar panel and a charging output interface, wherein the solar panel is electrically connected to the charging output interface, and further comprising an indication alarm unit and a storage table for placing a mobile phone for charging, wherein the storage table is connected to the solar panel, and the storage table is provided with a temperature detection unit, wherein the temperature detection unit is electrically connected to the solar panel and the indication alarm unit respectively.
[0007] Specifically, the temperature detection unit includes a temperature sensing module and a temperature judgment module, the temperature sensing module is electrically connected to the charging output interface, the temperature sensing module is electrically connected to the temperature judgment module, the temperature judgment module is electrically connected to the indication alarm module, and the storage platform is provided with a temperature detection unit, which means that: at least the temperature sensing module is arranged in the storage platform.
[0008] Furthermore, the charging output interface includes a positive output electrode and a negative output electrode, the temperature sensing module includes a thermistor and a first current limiting resistor, the first end of the thermistor is electrically connected to the positive output electrode, and is electrically connected to the temperature judgment module as the first output end of the temperature sensing module, the second end of the thermistor is electrically connected to the first end of the first current limiting resistor, and is electrically connected to the temperature judgment module as the third output end of the temperature sensing module, the second end of the first current limiting resistor is electrically connected to the negative output electrode and the ground wire, and is electrically connected to the temperature judgment module as the second output end of the temperature sensing module; the temperature sensing module is arranged in the storage table, which means that: at least the thermistor is arranged in the storage table.
[0009] Specifically, the temperature judgment module includes a second resistor, a third resistor, a first comparator, a second comparator, a first NOT gate, a second NOT gate, a first NAND gate and a second NAND gate. The first end of the second resistor is electrically connected to the first output end of the temperature sensing module, the second end of the second resistor is electrically connected to the first end of the third resistor, and is electrically connected to the positive phase input end of the first comparator, the second end of the third resistor is electrically connected to the second output end of the temperature sensing module, and is electrically connected to the positive phase input end of the second comparator, the third output end of the temperature sensing module is electrically connected to the negative phase input end of the first comparator and the negative phase input end of the second comparator, the output end of the first comparator is electrically connected to the input end of the first NOT gate and the first input end of the first NAND gate, the output end of the second comparator is electrically connected to the input end of the second NOT gate, the output end of the second NOT gate is electrically connected to the second input end of the first NAND gate and the first input end of the second NAND gate, the output end of the first NOT gate is electrically connected to the second input end of the second NAND gate, the output end of the first NAND gate serves as the first output end of the temperature judgment module, and the output end of the second NAND gate serves as the second output end of the temperature judgment module.
[0010] Furthermore, the indication alarm unit includes a first transistor, a second transistor, a fourth resistor, a fifth resistor, a buzzer, a first light-emitting diode and a second light-emitting diode, the base of the first transistor is electrically connected to the first output end of the temperature judgment module, the emitter of the first transistor is grounded, the collector of the first transistor is electrically connected to the cathode of the first light-emitting diode, the anode of the first light-emitting diode is electrically connected to the cathode of the buzzer, the anode of the buzzer is electrically connected to the first end of the fourth resistor, the base of the second transistor is electrically connected to the second output end of the temperature judgment module, the emitter of the second transistor is grounded, the collector of the second transistor is electrically connected to the cathode of the second light-emitting diode, the anode of the second light-emitting diode is electrically connected to the first end of the fifth resistor, and the second end of the fourth resistor and the second end of the fifth resistor serve as power input ends of the indication alarm unit for electrically connecting to a 5V power supply.
[0011] Specifically, the solar cell panel includes a photovoltaic panel, a rectifier module and a voltage stabilizing module. The output end of the photovoltaic panel is electrically connected to the input end of the rectifier module, the output end of the rectifier module is electrically connected to the input end of the voltage stabilizing module, and the output end of the voltage stabilizing module is electrically connected to the charging output interface.
[0012] Furthermore, the output end of the photovoltaic panel includes a positive electrode and a negative electrode, and the rectifier module includes a first diode, a second diode, a third diode and a fourth diode. The positive electrode of the first diode is connected to the negative electrode of the third diode and serves as the first input end of the rectifier module and is connected to the positive electrode of the photovoltaic panel. The negative electrode of the first diode is connected to the negative electrode of the second diode and serves as the first output end of the rectifier module. The positive electrode of the second diode is connected to the negative electrode of the fourth diode and is connected to the negative electrode of the photovoltaic panel as the second input end of the rectifier module. The positive electrode of the third diode is connected to the positive electrode of the fourth diode and serves as the second output end of the rectifier module.
[0013] Specifically, the voltage stabilizing module includes a sixth resistor and a voltage stabilizing diode. The first end of the sixth resistor is connected to the first output end of the rectifier module as the first input end of the voltage stabilizing module, the second end of the sixth resistor is connected to the negative electrode of the voltage stabilizing diode, and is connected to the charging output interface as the positive output end of the voltage stabilizing module. The positive electrode of the voltage stabilizing diode is connected to the second output end of the rectifier module as the second input end of the voltage stabilizing module, and is connected to the charging output interface as the negative output end of the voltage stabilizing module.
[0014] Furthermore, the solar cell panel further includes a filter module, the filter module is a capacitor, and two ends of the capacitor are respectively connected to the first output end and the second output end of the rectifier module in a one-to-one correspondence.
[0015] Specifically, it also includes a battery unit, and the charging and discharging port of the battery unit is electrically connected to the charging output interface.
[0016] (III) Beneficial effects
[0017] Compared with the prior art, the utility model provides a solar cell phone charging device with an overheat alarm function, which has the following beneficial effects:
[0018] The solar cell phone charging device with overheat alarm function can utilize solar energy to charge the connected cell phone through the solar panel, which is more energy-saving and environmentally friendly, reduces costs, and can be charged in sunny places, which is more convenient. When the temperature of the cell phone placed on the storage table for charging is too high, the indication alarm module will be activated to convey the information of overtemperature to the user, that is, it has an overheat alarm function, which is safer and more reliable. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:
[0020] Figure 1 This is a system block diagram of the solar cell phone charging device with overheat alarm function of the utility model;
[0021] Figure 2 This is a schematic diagram of the circuit principle of the solar cell phone charging device with overheat alarm function of the utility model;
[0022] Figure 3 This is another circuit principle diagram of the solar cell phone charging device with overheat alarm function of the utility model.
[0023] In the figure: PV is a photovoltaic panel, D1 is a first diode, D2 is a second diode, D3 is a third diode, D4 is a fourth diode, C1 is a capacitor, VDw is a voltage-stabilizing diode, RT is a thermistor, R1 is a first current-limiting resistor, R2 is a second resistor, R3 is a third resistor, R4 is a fourth resistor, R5 is a fifth resistor, R6 is a sixth resistor, U2-1 is a first comparator, U2-2 is a second comparator, U1-1 is a first NOT gate, U1-2 is a first NAND gate, U1-3 is a second NAND gate, U1-4 is a second NOT gate, Q1 is a first transistor, Q2 is a second transistor, LED1 is a first light-emitting diode, LED2 is a second light-emitting diode, and BUGZ1 is a buzzer. DETAILED DESCRIPTION
[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.
[0025] like Figure 1 As shown, in an embodiment of the utility model, a solar mobile phone charging device with an overheat alarm function is provided, including a solar panel, a charging output interface, an indication alarm unit and a storage table for placing a mobile phone for charging, wherein the solar panel is electrically connected to the charging output interface, the storage table is connected to the solar panel, and the storage table is provided with a temperature detection unit, which is electrically connected to the solar panel and the indication alarm unit respectively.
[0026] It can be understood that in the solar mobile phone charging device with overheating alarm function in the embodiment of the present application, a temperature detection unit is arranged on the storage table, so that the temperature detection unit can detect the temperature of the mobile phone placed on the storage table for charging, and the temperature detection unit is electrically connected to the indication alarm unit, so that the indication alarm unit can output corresponding indication or alarm information according to the temperature detection result.
[0027] In some embodiments, the temperature detection unit may include a temperature sensing module and a temperature judgment module, wherein the temperature sensing module is electrically connected to the charging output interface, the temperature sensing module is electrically connected to the temperature judgment module, and the temperature judgment module is electrically connected to the indication alarm module. The storage platform may be provided with a temperature detection unit such that: at least the temperature sensing module is provided in the storage platform.
[0028] It can be understood that, generally speaking, the temperature detection unit includes a detection and judgment part, namely a temperature sensing module and a temperature judgment module. Since the detection part needs to correspond to the object to be detected (in this embodiment, the mobile phone placed on the storage table), and other parts are not required, only the temperature sensing module can be set in the storage table.
[0029] See also Figure 2 In some embodiments, the charging output interface may include a positive output electrode and a negative output electrode, and the temperature sensing module may include a thermistor RT and a first current limiting resistor R1, wherein a first end of the thermistor RT is electrically connected to the positive output electrode, and is electrically connected to the temperature judgment module as a first output end of the temperature sensing module, a second end of the thermistor RT is electrically connected to a first end of the first current limiting resistor R1, and is electrically connected to the temperature judgment module as a third output end of the temperature sensing module, a second end of the first current limiting resistor R1 is electrically connected to the negative output electrode and a ground wire, and is electrically connected to the temperature judgment module as a second output end of the temperature sensing module; the temperature sensing module is arranged in the storage table as follows: at least the thermistor RT is arranged in the storage table.
[0030] It can be understood that the above embodiment provides a simple and easy-to-implement temperature sensing module, which may include a thermistor RT and a first current limiting resistor R1. Temperature sensing is performed by using the characteristic that the thermistor RT has different resistance values according to temperature changes. Therefore, at least the thermistor RT needs to be set in the storage table. The thermistor may be a 10K ntc thermistor.
[0031] See also Figure 2In some embodiments, the temperature judgment module may include a second resistor R2, a third resistor R3, a first comparator U2-1, a second comparator U2-2, a first NOT gate U1-1, a second NOT gate U1-4, a first NAND gate U1-2 and a second NAND gate U1-3, wherein a first end of the second resistor R2 is electrically connected to a first output end of the temperature sensing module, a second end of the second resistor R2 is electrically connected to a first end of the third resistor R3, and is electrically connected to a positive phase input end of the first comparator U2-1, a second end of the third resistor R3 is electrically connected to a second output end of the temperature sensing module, and is electrically connected to a positive phase input end of the second comparator U2-2, and a third output end of the temperature sensing module is electrically connected to a positive phase input end of the first comparator U2-1. The negative phase input terminal is electrically connected to the negative phase input terminal of the second comparator U2-2, the output terminal of the first comparator U2-1 is electrically connected to the input terminal of the first NOT gate U1-1 and the first input terminal of the first NAND gate U1-2, the output terminal of the second comparator U2-2 is electrically connected to the input terminal of the second NOT gate U1-4, the output terminal of the second NOT gate U1-4 is electrically connected to the second input terminal of the first NAND gate U1-2 and the first input terminal of the second NAND gate U1-3, the output terminal of the first NOT gate U1-1 is electrically connected to the second input terminal of the second NAND gate U1-3, the output terminal of the first NAND gate U1-2 serves as the first output terminal of the temperature judgment module, and the output terminal of the second NAND gate U1-3 serves as the second output terminal of the temperature judgment module.
[0032] It can be understood that, generally speaking, the voltage between the positive output electrode and the negative output electrode of the charging output interface is 5V, so that the charging output interface can charge the mobile phone. If the mobile phone is placed on a storage table and charged through the charging output interface, when the mobile phone is overheated, the resistance of the thermistor RT in the above embodiment is low. At this time, the voltage input to the negative input terminal of the first comparator U2-1 is greater than the voltage input to its own positive input terminal, and the voltage input to the negative input terminal of the second comparator U2-2 is also greater than the voltage input to its own positive input terminal. Therefore, at this time, the first comparator U2-1 and the second comparator U2-2 both output a low level, and then pass through two NOT gates (the first NOT gate U1-1 and the second NOT gate U1-4) and two NAND gates (the first NAND gate U1-2 and the second NAND gate U1-4). The first NAND gate U1-3) makes the output of the first NAND gate U1-2 high and the output of the second NAND gate U1-3 low; when the temperature of the mobile phone is low, the resistance of the thermistor RT is high. At this time, the voltage input to the negative input terminal of the first comparator U2-1 is less than the voltage input to its positive input terminal, and the voltage input to the negative input terminal of the second comparator U2-2 is greater than the voltage input to its positive input terminal. Therefore, at this time, the first comparator U2-1 outputs a high level and the second comparator U2-2 outputs a low level. After passing through two NAND gates (the first NAND gate U1-1 and the second NAND gate U1-4) and two NAND gates (the first NAND gate U1-2 and the second NAND gate U1-3), the output of the first NAND gate U1-2 is low and the output of the second NAND gate U1-3 is high. It can be seen that after adopting the temperature judgment module, it is possible to judge whether the temperature of the mobile phone is overheated, and the threshold for judging whether it is overheated can be set accordingly by selecting the thermistor RT and the resistance value of the first current limiting resistor R1. In this example, when the thermistor is a 10Kntc thermistor, and the first current limiting resistor R1, the second resistor R2 and the third resistor R4 are all 2KΩ, the temperature judgment module can be made such that when the temperature of the mobile phone is higher than 75°C, the output of the first NAND gate U1-2 is high level, and the output of the second NAND gate U1-3 is low level; and when the temperature of the mobile phone is lower than 75°C, the output of the first NAND gate U1-2 is low level, and the output of the second NAND gate U1-3 is high level. At the same time, since the requirements for temperature judgment in this embodiment are not very strict, there is no need to make corresponding restrictions on the first comparator U2-1 and the second comparator U2-2 when the inputs at the positive input terminal and the negative input terminal are the same. It is related to the model and characteristics of the comparator itself and is not limited here.
[0033] Also, see Figure 3 For ease of use, the two NOT gates (the first NOT gate U1-1 and the second NOT gate U1-4) can also be replaced by two NAND gates, namely the third NAND gate U1-5 and the fourth NAND gate U1-6, which can be used as NOT gates by connecting their two input terminals together.
[0034] To save space, the LM358 chip and CD4011BE control chip can be used to achieve the above Figure 3 The first comparator U2-1, the second comparator U2-2, the first NAND gate U1-2, the second NAND gate U1-3, the third NAND gate U1-5 and the fourth NAND gate U1-6 in the circuit, wherein the first pin of the LM358 chip serves as the output end of the first comparator U2-1, the second pin of the LM358 chip serves as the negative phase input end of the first comparator U2-1, the third pin of the LM358 chip serves as the positive phase input end of the first comparator U2-1, the fifth pin of the LM358 chip serves as the positive phase input end of the second comparator U2-2, the sixth pin of the LM358 chip serves as the negative phase input end of the second comparator U2-2, and the seventh pin of the LM358 chip serves as the output end of the second comparator U2-2; the first pin and the second pin of the CD4011BE control chip serve as the two positive phase input ends of the third NAND gate U1-5, respectively. input terminals, the third pin of the CD4011BE control chip serves as the output terminal of the third NAND gate U1-5, the fourth pin of the CD4011BE control chip serves as the output terminal of the first NAND gate U1-2, the fifth pin and the sixth pin of the CD4011BE control chip serve as the first input terminal and the second input terminal of the first NAND gate U1-2 respectively, the eighth pin and the ninth pin of the CD4011BE control chip serve as the first input terminal and the second input terminal of the second NAND gate U1-3 respectively, the tenth pin of the CD4011BE control chip serves as the output terminal of the second NAND gate U1-3, the eleventh pin of the CD4011BE control chip serves as the output terminal of the fourth NAND gate U1-6, and the twelfth pin and the thirteenth pin of the CD4011BE control chip serve as the two input terminals of the fourth NAND gate U1-6 respectively.
[0035] See also Figure 2 or Figure 3In some embodiments, the indication alarm unit may include a first transistor Q1, a second transistor Q2, a fourth resistor R4, a fifth resistor R5, a buzzer BUGZ1, a first light-emitting diode LED1 and a second light-emitting diode LED2, wherein the base of the first transistor Q1 is electrically connected to the first output end of the temperature judgment module, the emitter of the first transistor Q1 is grounded, the collector of the first transistor Q1 is electrically connected to the cathode of the first light-emitting diode LED1, the anode of the first light-emitting diode LED1 is electrically connected to the cathode of the buzzer BUGZ1, the anode of the buzzer BUGZ1 is electrically connected to the first end of the fourth resistor R4, the base of the second transistor Q2 is electrically connected to the second output end of the temperature judgment module, the emitter of the second transistor Q2 is grounded, the collector of the second transistor Q2 is electrically connected to the cathode of the second light-emitting diode LED2, the anode of the second light-emitting diode LED2 is electrically connected to the first end of the fifth resistor R5, and the second end of the fourth resistor R4 and the second end of the fifth resistor R5 serve as power input ends of the indication alarm unit for electrically connecting a 5V power supply.
[0036] It can be understood that when the first output terminal of the temperature judgment module outputs a high level and the second output terminal outputs a low level, the first light-emitting diode LED1 emits light and the buzzer BUGZ1 emits a buzzing sound, thereby prompting the user that the mobile phone temperature is too high. Conversely, when the first output terminal of the temperature judgment module outputs a low level and the second output terminal outputs a high level, the second light-emitting diode LED2 emits light, thereby prompting the user that the mobile phone temperature is normal. To make the prompt easier to distinguish, the first light-emitting diode can be set to red light and the second light-emitting diode can be set to green light.
[0037] Here, the second end of the fourth resistor R4 and the second end of the fifth resistor R5 are used as power input terminals of the indication alarm unit, and are used to be electrically connected to a 5V power supply. The 5V power supply can also be provided through a charging output interface.
[0038] In some embodiments, the solar panel may include a photovoltaic panel, a rectifier module and a voltage stabilizing module, wherein the output end of the photovoltaic panel is electrically connected to the input end of the rectifier module, the output end of the rectifier module is electrically connected to the input end of the voltage stabilizing module, and the output end of the voltage stabilizing module is electrically connected to the charging output interface.
[0039] It is understandable that the photovoltaic panels used by the solar panel generate electricity under the irradiation of sunlight, and its voltage is not stable. Therefore, a rectifier module and a voltage regulator module are required to make the output voltage of the charging output interface a relatively stable 5V voltage.
[0040] See also Figure 2 or Figure 3In some embodiments, the output end of the photovoltaic panel PV may include a positive electrode and a negative electrode, and the rectifier module may include a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4, wherein the positive electrode of the first diode D1 is connected to the negative electrode of the third diode D3, and is connected to the positive electrode of the photovoltaic panel PV as the first input end of the rectifier module, the negative electrode of the first diode D1 is connected to the negative electrode of the second diode D2, and is connected to the first output end of the rectifier module, the positive electrode of the second diode D2 is connected to the negative electrode of the fourth diode D4, and is connected to the negative electrode of the photovoltaic panel PV as the second input end of the rectifier module, and the positive electrode of the third diode D3 is connected to the positive electrode of the fourth diode D4, and is connected to the second output end of the rectifier module.
[0041] It can be understood that the above embodiment provides a simple and easy-to-implement rectifier module, which forms a bridge rectifier circuit through the first diode D1, the second diode D2, the third diode D3 and the fourth diode D4.
[0042] See also Figure 2 or Figure 3 In some embodiments, the voltage stabilizing module may include a sixth resistor R6 and a voltage stabilizing diode VDw, wherein the first end of the sixth resistor R6 is connected to the first output end of the rectifier module as the first input end of the voltage stabilizing module, the second end of the sixth resistor R6 is connected to the negative electrode of the voltage stabilizing diode VDw, and is connected to the charging output interface as the positive output end of the voltage stabilizing module, and the positive electrode of the voltage stabilizing diode VDw is connected to the second output end of the rectifier module as the second input end of the voltage stabilizing module, and is connected to the charging output interface as the negative output end of the voltage stabilizing module.
[0043] It can be understood that the above embodiment provides a simple and easy-to-implement voltage stabilizing module, which uses the voltage stabilizing diode VDw to make the output voltage a relatively stable 5V voltage to meet the needs of mobile phone charging.
[0044] See also Figure 2 or Figure 3 The solar cell panel may further include a filter module, wherein the filter module may be a capacitor C1, and two ends of the capacitor C1 are respectively connected to the first output end and the second output end of the rectifier module in a one-to-one correspondence.
[0045] In some embodiments, a battery unit may also be included, wherein a charging and discharging port of the battery unit is electrically connected to the charging output interface.
[0046] It is understandable that without a battery unit, the solar mobile phone charging device can only charge the mobile phone under sunlight, and the charging time is limited. In addition, due to the instability of solar energy, the charging time is also not fixed. Therefore, by adding a battery unit, the electricity generated by the photovoltaic panel can be stored as much as possible when the mobile phone is not charged. When needed, the battery unit can be used to power the mobile phone for charging. Generally, the charging and discharging ports of the battery unit are together, and the problem of simultaneous power supply of the battery and the photovoltaic panel can be solved by setting the corresponding anti-backflow circuit. This is a prior art and will not be described in detail here.
[0047] In the utility model, since the solar cell phone charging device can be portable, the photovoltaic panel in the solar cell panel can be hinged to the storage table, so that the photovoltaic panel PV can be folded on the storage table, and the light-receiving surface of the photovoltaic panel is fitted with the storage table, and the photovoltaic panel is unfolded when in use. This is not only convenient for carrying, but also can protect the photovoltaic panel as much as possible when not in use.
[0048] In addition, the storage table can be made of a plate-shaped material that is easy to conduct heat, and a temperature sensor element such as a thermistor RT can be placed in it. Due to the easy heat conduction, the temperature sensor element does not need to be placed above the storage table and in contact with the placed mobile phone, but is completely covered by the storage table, thereby forming a kind of protection. At the same time, when there is a battery unit, since the battery unit also needs to be charged by the photovoltaic panel, it will also generate heat like the mobile phone. Therefore, the battery unit can also be placed under the storage table and in contact with the lower surface of the storage table. When the storage table is set to be made of a plate-shaped material that is easy to conduct heat and has an appropriate thickness (and the position of the temperature sensor element in the storage table is also appropriate), the temperature sensor element can not only detect whether the temperature of the mobile phone is too high, but also detect whether the temperature of the battery unit is too high.
[0049] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0050] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.
Claims
1. A solar cell phone charging device with an overheat alarm function, comprising a solar panel and a charging output interface, wherein the solar panel is electrically connected to the charging output interface, and characterized in that: It also includes an indication alarm unit and a storage table for placing a mobile phone for charging, wherein the storage table is connected to the solar panel and is provided with a temperature detection unit, wherein the temperature detection unit is electrically connected to the solar panel and the indication alarm unit respectively.
2. The solar cell phone charging device with overheat alarm function according to claim 1, characterized in that: The temperature detection unit includes a temperature sensing module and a temperature judgment module, the temperature sensing module is electrically connected to the charging output interface, the temperature sensing module is electrically connected to the temperature judgment module, the temperature judgment module is electrically connected to the indication alarm module, and the storage platform is provided with a temperature detection unit, which means that: at least the temperature sensing module is arranged in the storage platform.
3. The solar cell phone charging device with overheat alarm function according to claim 2, characterized in that: The charging output interface includes a positive output electrode and a negative output electrode, the temperature sensing module includes a thermistor and a first current limiting resistor, the first end of the thermistor is electrically connected to the positive output electrode, and is electrically connected to the temperature judgment module as the first output end of the temperature sensing module, the second end of the thermistor is electrically connected to the first end of the first current limiting resistor, and is electrically connected to the temperature judgment module as the third output end of the temperature sensing module, the second end of the first current limiting resistor is electrically connected to the negative output electrode and the ground wire, and is electrically connected to the temperature judgment module as the second output end of the temperature sensing module; the temperature sensing module is arranged in the storage table, which means that: at least the thermistor is arranged in the storage table.
4. The solar cell phone charging device with overheat alarm function according to claim 3, characterized in that: The temperature judgment module includes a second resistor, a third resistor, a first comparator, a second comparator, a first NOT gate, a second NOT gate, a first NAND gate and a second NAND gate. The first end of the second resistor is electrically connected to the first output end of the temperature sensing module, the second end of the second resistor is electrically connected to the first end of the third resistor and is electrically connected to the positive phase input end of the first comparator, the second end of the third resistor is electrically connected to the second output end of the temperature sensing module and is electrically connected to the positive phase input end of the second comparator, the third output end of the temperature sensing module is electrically connected to the negative phase input end of the first comparator and the negative phase input end of the second comparator, the output end of the first comparator is electrically connected to the input end of the first NOT gate and the first input end of the first NAND gate, the output end of the second comparator is electrically connected to the input end of the second NOT gate, the output end of the second NOT gate is electrically connected to the second input end of the first NAND gate and the first input end of the second NAND gate, the output end of the first NOT gate is electrically connected to the second input end of the second NAND gate, the output end of the first NAND gate serves as the first output end of the temperature judgment module, and the output end of the second NAND gate serves as the second output end of the temperature judgment module.
5. The solar cell phone charging device with overheat alarm function according to claim 4, characterized in that: The indication alarm unit includes a first triode, a second triode, a fourth resistor, a fifth resistor, a buzzer, a first light-emitting diode and a second light-emitting diode. The base of the first triode is electrically connected to the first output end of the temperature judgment module, the emitter of the first triode is grounded, the collector of the first triode is electrically connected to the cathode of the first light-emitting diode, the anode of the first light-emitting diode is electrically connected to the cathode of the buzzer, the anode of the buzzer is electrically connected to the first end of the fourth resistor, the base of the second triode is electrically connected to the second output end of the temperature judgment module, the emitter of the second triode is grounded, the collector of the second triode is electrically connected to the cathode of the second light-emitting diode, the anode of the second light-emitting diode is electrically connected to the first end of the fifth resistor, and the second end of the fourth resistor and the second end of the fifth resistor serve as power input ends of the indication alarm unit for electrically connecting a 5V power supply.
6. The solar cell phone charging device with overheat alarm function according to claim 1, characterized in that: The solar cell panel includes a photovoltaic panel, a rectifier module and a voltage stabilizing module. The output end of the photovoltaic panel is electrically connected to the input end of the rectifier module, the output end of the rectifier module is electrically connected to the input end of the voltage stabilizing module, and the output end of the voltage stabilizing module is electrically connected to the charging output interface.
7. The solar cell phone charging device with overheat alarm function according to claim 6, characterized in that: The output end of the photovoltaic panel includes a positive electrode and a negative electrode, and the rectifier module includes a first diode, a second diode, a third diode and a fourth diode. The positive electrode of the first diode is connected to the negative electrode of the third diode and is connected to the positive electrode of the photovoltaic panel as the first input end of the rectifier module. The negative electrode of the first diode is connected to the negative electrode of the second diode and is connected to the first output end of the rectifier module. The positive electrode of the second diode is connected to the negative electrode of the fourth diode and is connected to the negative electrode of the photovoltaic panel as the second input end of the rectifier module. The positive electrode of the third diode is connected to the positive electrode of the fourth diode and is connected to the second output end of the rectifier module.
8. The solar cell phone charging device with overheat alarm function according to claim 7, characterized in that: The voltage stabilizing module includes a sixth resistor and a voltage stabilizing diode. The first end of the sixth resistor is connected to the first output end of the rectifier module as the first input end of the voltage stabilizing module, the second end of the sixth resistor is connected to the cathode of the voltage stabilizing diode, and is connected to the charging output interface as the positive output end of the voltage stabilizing module. The anode of the voltage stabilizing diode is connected to the second output end of the rectifier module as the second input end of the voltage stabilizing module, and is connected to the charging output interface as the negative output end of the voltage stabilizing module.
9. The solar cell phone charging device with overheat alarm function according to claim 7, characterized in that: The solar cell panel further comprises a filter module, which is a capacitor, and two ends of the capacitor are respectively connected to the first output end and the second output end of the rectifier module in a one-to-one correspondence.
10. The solar cell phone charging device with overheat alarm function according to any one of claims 1 to 9, characterized in that: It also includes a battery unit, and the charging and discharging port of the battery unit is electrically connected to the charging output interface.