Temperature control circuit, method and electronic equipment

Abstract

A temperature control circuit, method and electronic device, the temperature control circuit includes an interface module, a boost control system, a heating film resistor, a control module and a battery; the interface module is connected to the input end of the boost control system with the battery; the output end of the boost control system is connected to the heating film resistor; the interface module is used to connect an external power supply to charge the battery and supply power to the input end of the boost control system; the boost control system boosts the input voltage of the interface module and provides the boosted voltage to the heating film resistor; the first output end of the control module is connected to the first control end of the boost control system; the second output end of the control module is connected to the second control end of the boost control system; the control module adjusts the voltage of the heating film resistor by adjusting the first control signal of the first control end; the control module adjusts the conduction time of the heating film resistor by adjusting the second control signal of the second control end. The embodiment of the present application can be used to increase the battery temperature.

Description

Technical Field

[0001] The present application relates to the technical field of terminal equipment, and in particular to a temperature control circuit, method and electronic equipment. Background Art

[0002] During battery charging, there are certain requirements for the temperature environment. The battery cannot be charged in an environment with too low a temperature. However, in winter in high-latitude areas, the ambient temperature is far lower than the temperature at which the battery can be charged. When the battery temperature is below the charging temperature range, the electronic device cannot be charged. Summary of the invention

[0003] Embodiments of the present application provide a temperature control circuit, method, and electronic device that can be used to increase the temperature of a battery.

[0004] In the first aspect, an embodiment of the present application provides a temperature control circuit, which includes an interface module, a boost control system, a heating film resistor, a control module and a battery; the interface module is connected to the battery and the input end of the boost control system; the output end of the boost control system is connected to the heating film resistor; the interface module is used to connect an external power supply to charge the battery and to supply power to the input end of the boost control system; the boost control system boosts the input voltage of the interface module and provides the boosted voltage to the heating film resistor; the first output end of the control module is connected to the first control end of the boost control system; the second output end of the control module is connected to the second control end of the boost control system; the control module adjusts the voltage of the heating film resistor by adjusting the first control signal of the first control end; the control module adjusts the conduction time of the heating film resistor by adjusting the second control signal of the second control end.

[0005] The connection between the interface module and the battery may specifically be that the interface module is connected to the battery via a battery switch module SC, or that the interface module is connected to the battery via a power management unit PMU module.

[0006] In the implementation manner of the present application, the temperature control circuit can control the on and off of the boost control system and the voltage adjustment of the heating film resistor to ensure faster heating speed and more accurate heating time.

[0007] In a possible implementation, the boost control system includes a boost circuit and a conduction control circuit, the control end of the boost circuit is the first control end of the boost control system, and the control end of the conduction control circuit is the second control end of the boost control system. In this way, the voltage and conduction time of the heating film resistor can be controlled separately, which can increase the battery temperature, heating power and heating efficiency.

[0008] In a possible implementation, the first end of the conduction control circuit serves as the input end of the boost control system; the second end of the conduction control circuit is connected to the first end of the boost circuit, and the second end of the boost circuit is connected to the first end of the heating film resistor as the output end of the boost control system; or, the first end of the boost circuit serves as the input end of the boost control system; the second end of the boost circuit is connected to the first end of the conduction control circuit, and the second end of the conduction control circuit is connected to the first end of the heating film resistor as the output end of the boost control system; or, the first end of the boost circuit serves as the input end of the boost control system; the second end of the boost circuit is connected to the first end of the heating film resistor as the output end of the boost control system; and one end of the conduction control circuit is connected to the second end of the heating film resistor. In this way, the voltage and conduction time of the heating film resistor can be controlled separately, which can increase the battery temperature, heating power and heating efficiency.

[0009] The above structure can refer to Figure 2B to Figure 2D content.

[0010] In a possible implementation, when the interface module is connected to an external power supply, if the battery temperature is less than a first temperature threshold, the control module controls the boost control system to be turned on, and the heating film resistor operates normally. In this way, when the temperature is lower than the charging temperature environment, the temperature control circuit is started to heat the battery to ensure a normal charging temperature environment.

[0011] If the battery temperature is less than the first temperature threshold, reference may be made to the processes of S302 , S304 , S402 , S404 and S502 , S504 .

[0012] In a possible implementation, when the interface module is connected to an external power source, if the battery temperature is greater than or equal to the first temperature threshold, the control module controls the battery to start charging. In this way, the temperature environment is suitable for charging, and the battery can be charged directly, avoiding unnecessary heating process.

[0013] If the battery temperature is less than the first temperature threshold, reference may be made to the processes of S302 - S303 , S402 - S403 and S502 - S503 .

[0014] In a possible implementation, after the heating film resistor starts working, if the battery temperature is greater than a second temperature threshold, the control module controls the boost control system to be turned off, the heating film resistor stops working, and controls the battery to charge normally. In this way, when the battery temperature is greater than the normal charging threshold, normal charging can be started and heating can be stopped, thereby improving charging power and efficiency.

[0015] The above process may refer to the processes of S311, S312 and S303, and S405, S407 and S403, and S517, S521 and S503.

[0016] In a possible implementation, after the heating film resistor starts working, if the battery temperature is less than or equal to the second temperature threshold, the control module controls the heating film resistor to work for a first period of time, and then re-determines whether the battery temperature is greater than the second temperature threshold. In this way, the electronic device can heat as quickly as possible before reaching the second temperature threshold, stop heating after heating to the second temperature threshold, and start normal charging, thereby increasing the charging rate and heating speed.

[0017] The above process may refer to the processes of S405 and S406.

[0018] In a possible implementation, after the heating film resistor starts working, if the power of the heating film resistor is less than or equal to the preset power, the control module adjusts the first control signal to increase the power of the heating film resistor. In this way, it can be ensured that the heating power is greater than the preset power, that is, there is a minimum heating power, which ensures that the heating power is relatively high and the heating speed is fast.

[0019] In a possible implementation, the control module adjusts the first control signal to increase the power of the heating film resistor, including: adjusting the first control signal to increase the voltage of the heating film resistor. In this way, it can be ensured that the heating power is greater than the preset power, that is, there is a minimum heating power, which ensures that the heating power is relatively high and the heating speed is fast.

[0020] In a possible implementation, after the heating film resistor starts working, the control module adjusts the on-time of the heating film resistor based on the magnitude relationship between the battery temperature and the first temperature threshold. In this way, when the battery temperature rises, the on-time is reduced to provide more power to the battery for charging. In order to maintain the battery temperature, when the battery temperature drops, the on-time is increased to ensure that the battery temperature is within the chargeable adjustment range, and the charging temperature can be maintained while providing a good charging temperature and rate.

[0021] In a possible implementation, the adjusting the conduction time of the heating film resistor based on the magnitude relationship between the battery temperature and the first temperature threshold includes: if the battery temperature is less than or equal to the first temperature threshold, the control module adjusts the second control signal to increase the conduction time of the heating film resistor. In this way, when the battery temperature rises, the conduction time is reduced to provide more power to the battery for charging. In order to maintain the battery temperature, when the battery temperature drops, the conduction time is increased to ensure that the battery temperature is within the chargeable adjustment range, and the charging temperature can be maintained while providing a good charging temperature and rate.

[0022] In a possible implementation, the on-time of the heating film resistor is adjusted based on the magnitude relationship between the battery temperature and the first temperature threshold, including: if the battery temperature is less than or equal to the first temperature threshold, the control module re-judgments whether the battery temperature is greater than the first temperature threshold when the temperature rise rate is greater than the first threshold rate; when the temperature rise rate is less than or equal to the first threshold rate, the second control signal is adjusted to increase the on-time of the heating film resistor, and re-judgments whether the battery temperature is greater than the first temperature threshold. In this way, in a low temperature environment, the on-time is increased, the heating power is increased, the battery temperature rises quickly, and the charging time and heating time are reduced.

[0023] In a possible implementation, the control module adjusts the conduction time of the heating film resistor based on the magnitude relationship between the battery temperature and the first temperature threshold, and further includes: when the battery temperature is greater than the first temperature threshold, the control module controls the battery to start charging; after the battery starts charging, the control module adjusts the conduction time of the heating film resistor based on the magnitude relationship between the battery temperature and the second temperature threshold. When the temperature environment allows charging to start, charging can be performed while heating, and a good charging temperature and rate can be provided while maintaining the charging temperature.

[0024] In a possible implementation, the on-time of the heating film resistor is adjusted based on the magnitude relationship between the battery temperature and the second temperature threshold, including: if the battery temperature is less than the second temperature threshold, when the battery temperature drops, the on-time of the heating film resistor is increased, and whether the battery temperature is greater than the first temperature threshold is re-judged; when the battery temperature does not drop, the on-time of the heating film resistor is reduced, and whether the battery temperature is greater than the second temperature threshold is re-judged. In this way, when the battery temperature rises, the on-time is reduced, and more power is provided to the battery for charging. In order to maintain the battery temperature, when the battery temperature drops, the on-time is increased to ensure that the battery temperature is within the chargeable adjustment range, and the charging temperature can be maintained while providing a good charging temperature and rate.

[0025] In a possible implementation, after the battery starts charging, the control module acquires the first battery temperature and determines the first temperature rise rate; based on the first temperature rise rate and the upper and lower temperature rates of the first temperature rate range, the conduction time of the heating film resistor is adjusted. In this way, the battery temperature rise rate can be controlled to rise steadily within the first temperature rate range, balancing the charging power and the heating power, ensuring a normal charging temperature environment while speeding up the charging speed.

[0026] In a possible implementation, the control module adjusts the conduction time of the heating film resistor based on the relationship between the first temperature rise rate and the upper limit temperature rate and the lower limit temperature rate of the first temperature rate range, including: when the first temperature rise rate is greater than the upper limit temperature rate, the control module reduces the conduction time of the heating film resistor; when the first temperature rise rate is less than the lower limit temperature rate, the control module increases the conduction time of the heating film resistor; when the first temperature rise rate is between the lower limit temperature rate and the lower limit temperature rate, if the battery temperature is less than the second temperature threshold, the process of obtaining the first battery temperature and determining the first temperature rise rate is re-executed. In this way, the temperature rise rate of the battery temperature can be controlled to steadily rise within the first temperature rate range, the heating power of the charging power is balanced, and the charging speed is accelerated while ensuring a normal charging temperature environment.

[0027] In a possible implementation, after reducing the conduction time of the heating film resistor or increasing the conduction time of the heating film resistor, the control device re-acquires the first battery temperature and determines the first temperature rise rate. In this way, the battery temperature rise rate can be controlled to rise steadily within the first temperature rate range, balancing the heating power of the charging power, ensuring a normal charging temperature environment, and speeding up the charging speed.

[0028] In a possible implementation, during the normal charging of the battery, the control module continues to obtain the battery temperature and determines whether the battery temperature is less than the first temperature threshold; when the battery temperature is less than the first temperature threshold, the boost control system is controlled to be turned on and the heating film resistor starts to work; when the battery temperature is greater than the first temperature threshold, the battery maintains normal charging. In this way, in order to avoid the ambient temperature being lower and the battery temperature falling below the first temperature threshold, temperature monitoring is performed during the normal charging process, and the heating function is activated when necessary, so as to ensure a good temperature environment for charging.

[0029] In a possible implementation, when a first condition is met, the control module controls the boost control system to be turned off and the heating film resistor to stop working; the first condition includes any one of the interface module disconnecting the external power supply and the battery charging being completed. In this way, heating can be stopped when charging is completed to avoid wasting electric energy.

[0030] In a possible implementation, the boost control system includes a first diode D1, a second diode D2, a first capacitor C1, a second capacitor C2, and a first switch tube Q1, including: the anode of D1 is connected to the first end of the interface module as the input end of the boost control system; the cathode of D1 is connected to the anode of D2 and the first end of C1; the cathode of D2 is connected to the first end of C2 and the first end of the heating film resistor; the second end of the heating film resistor is connected to the drain of Q1, and the source of Q1 and the second end of C2 are grounded; the second end of C1 is used as the first control end of the boost control system; the gate of the first switch tube Q1 is used as the second control end of the boost control system. In this way, for the boost process of the charge pump circuit, the electronic device can effectively control the battery heating.

[0031] In a possible implementation, the control module adjusts the voltage of the heating film resistor by adjusting the first control signal of the first control terminal, including: the control module increases the voltage of the first control signal, and the voltage of the first terminal of the heating film resistor increases; the control module reduces the voltage of the first control signal, and the voltage of the first terminal of the heating film resistor decreases; the control module adjusts the conduction time of the heating film resistor by adjusting the second control signal of the second control terminal, including: the control module increases the duty cycle of the second control signal, and the conduction time of the heating film resistor increases; the control module reduces the duty cycle of the second control signal, and the conduction time of the heating film resistor decreases. In this way, for the boost process of the charge pump circuit, the electronic device can effectively control the battery heating.

[0032] In a possible implementation, the boost control system further includes a voltage detection module, a current detection module and a current detection resistor R3; the source of Q5 is grounded, including: the source of Q5 is grounded through R3; the first end of R3 is grounded, and the second end of R3 is connected to the source of Q5 and the current detection module; the first end of the heating film resistor is connected to the voltage detection module; the control module obtains the voltage of the heating film resistor through the voltage detection module, and the control module obtains the current of the heating film resistor through the current detection module. In this way, the current and voltage can be detected, and the speed of heating can be flexibly adjusted.

[0033] In a possible implementation, the boost control system includes a first inductor L1, a third switch tube Q3, a fourth switch tube Q4, a fifth switch tube Q5, and an output filter capacitor C3, including: the first end of L1 is connected to the first end of the interface module as the input end of the boost control system, the second end of L1 is connected to the drain of Q3 and the drain of Q4; the source of Q3 is connected to the first end of C3 and one end of the heating film resistor; the source of Q4, the second end of C3 and the source of Q5 are all grounded; the second end of the heating film resistor is connected to the drain of Q5; the gate of Q3 and the gate of Q4 serve as the first control end of the boost control system, and the gate of Q5 serves as the second control end of the boost control system. In this way, for the boost process of the Boost circuit, the electronic device can effectively control the battery heating.

[0034] In a possible implementation, the temperature control circuit is applied to an electronic device, the electronic device includes a middle frame and / or a back cover; the heating film resistor is located between the middle frame and the battery; or the heating film resistor is located between the back cover and the battery. In this way, for electronic products such as mobile phones and tablets, placing the heating film resistor in a suitable position can improve the heating efficiency.

[0035] In a second aspect, an embodiment of the present application provides a temperature control method, which is applied to an electronic device, and the method includes: the electronic device includes an interface module, a boost control system, a heating film resistor and a battery; the interface module and the battery are connected to the input end of the boost control system; the output end of the boost control system is connected to the heating film resistor; the interface module is used to connect an external power supply to charge the battery and to supply power to the input end of the boost control system; the boost control system boosts the input voltage of the interface module and provides the boosted voltage to the heating film resistor; the electronic device adjusts the first control signal of the first control end of the boost control system to adjust the voltage of the heating film resistor; the electronic device adjusts the second control signal of the second control end of the boost control system to adjust the conduction time of the heating film resistor.

[0036] In a possible embodiment, the electronic device includes the control module, the first output end of the control module is connected to the first control end of the boost control system; the second output end of the control module is connected to the second control end of the boost control system; the electronic device adjusts the first control signal of the first control end of the boost control system to adjust the voltage of the heating film resistor, including: the control module adjusts the voltage of the heating film resistor by adjusting the first control signal of the first control end; the electronic device adjusts the second control signal of the second control end of the boost control system to adjust the conduction time of the heating film resistor, including: the control module adjusts the conduction time of the heating film resistor by adjusting the second control signal of the second control end.

[0037] In a possible implementation, the method further includes: when the interface module is connected to an external power supply, if the battery temperature is less than a first temperature threshold, the electronic device controls the boost control system to turn on, and the heating film resistor operates normally.

[0038] In a possible implementation, the method further includes: when the interface module is connected to an external power supply, if the battery temperature is greater than or equal to the first temperature threshold, the electronic device controls the battery to start charging.

[0039] In a possible implementation, the method further includes: after the heating film resistor starts working, if the battery temperature is greater than a second temperature threshold, the electronic device controls the boost control system to be cut off, the heating film resistor stops working, and controls the battery to charge normally.

[0040] In a possible implementation, the method further includes: after the heating film resistor starts working, if the battery temperature is less than or equal to the second temperature threshold, the electronic device controls the heating film resistor to work for a first period of time, and then re-determines whether the battery temperature is greater than the second temperature threshold.

[0041] In a possible implementation, the method further includes: after the heating film resistor starts to work, if the power of the heating film resistor is less than or equal to a preset power, the electronic device adjusts the first control signal to increase the power of the heating film resistor.

[0042] In a possible implementation, the electronic device adjusts the first control signal to increase the power of the heating film resistor, including: adjusting the first control signal to increase the voltage of the heating film resistor.

[0043] In a possible implementation manner, the method further includes: after the heating film resistor starts to work, the electronic device adjusts the on-time of the heating film resistor based on the magnitude relationship between the battery temperature and the first temperature threshold.

[0044] In a possible implementation, adjusting the on-time of the heating film resistor based on the relationship between the battery temperature and the first temperature threshold includes: if the battery temperature is less than or equal to the first temperature threshold, adjusting the second control signal to increase the on-time of the heating film resistor.

[0045] In a possible implementation, the on-time of the heating film resistor is adjusted based on the size relationship between the battery temperature and the first temperature threshold, including: if the battery temperature is less than or equal to the first temperature threshold, when the temperature rise rate is greater than the first threshold rate, re-judgment whether the battery temperature is greater than the first temperature threshold; when the temperature rise rate is less than or equal to the first threshold rate, adjust the second control signal to increase the on-time of the heating film resistor, and re-judgment whether the battery temperature is greater than the first temperature threshold.

[0046] In a possible implementation, the electronic device adjusts the conduction time of the heating film resistor based on the relationship between the battery temperature and the first temperature threshold, and the method further includes: when the battery temperature is greater than the first temperature threshold, controlling the battery to start charging; after the battery starts charging, adjusting the conduction time of the heating film resistor based on the relationship between the battery temperature and the second temperature threshold.

[0047] In a possible implementation, the on-time of the heating film resistor is adjusted based on the size relationship between the battery temperature and the second temperature threshold, including: if the battery temperature is lower than the second temperature threshold, when the battery temperature drops, the on-time of the heating film resistor is increased, and whether the battery temperature is higher than the first temperature threshold is re-judged; when the battery temperature does not drop, the on-time of the heating film resistor is reduced, and whether the battery temperature is higher than the second temperature threshold is re-judged.

[0048] In a possible implementation, the method further includes: after the battery starts charging, the electronic device obtains a first battery temperature and determines a first temperature rise rate; and adjusts the conduction time of the heating film resistor based on the first temperature rise rate and the upper limit temperature rate and lower limit temperature rate of the first temperature rate range.

[0049] In a possible implementation, the electronic device adjusts the conduction time of the heating film resistor based on the relationship between the first temperature rise rate and the upper limit temperature rate and the lower limit temperature rate of the first temperature rate range, including: when the first temperature rise rate is greater than the upper limit temperature rate, the electronic device reduces the conduction time of the heating film resistor; when the first temperature rise rate is less than the lower limit temperature rate, the electronic device increases the conduction time of the heating film resistor; when the first temperature rise rate is between the lower limit temperature rate and the lower limit temperature rate, if the battery temperature is less than the second temperature threshold, the electronic device re-executes the process of obtaining the first battery temperature and determining the first temperature rise rate.

[0050] In a possible implementation, the method further includes: after reducing the on-time of the heating film resistor or increasing the on-time of the heating film resistor, the electronic device re-acquires the first battery temperature and determines a first temperature increase rate.

[0051] In a possible implementation, the method further includes: during normal charging of the battery, the electronic device continues to obtain the battery temperature and determines whether the battery temperature is less than the first temperature threshold; when the battery temperature is less than the first temperature threshold, the boost control system is controlled to be turned on and the heating film resistor starts working; when the battery temperature is greater than the first temperature threshold, the battery maintains normal charging.

[0052] In a possible implementation, the method further includes: when a first condition is met, the electronic device controls the boost control system to be cut off and the heating film resistor to stop working; the first condition includes any one of the interface module disconnecting the external power supply and the battery charging being completed.

[0053] In a possible implementation, the boost control system includes a first diode D1, a second diode D2, a first capacitor C1, a second capacitor C2, and a first switch tube Q1, including: the anode of D1 is connected to the first end of the interface module as the input end of the boost control system; the cathode of D1 is connected to the anode of D2 and the first end of C1; the cathode of D2 is connected to the first end of C2 and the first end of the heating film resistor; the second end of the heating film resistor is connected to the drain of Q1, and the source of Q1 and the second end of C2 are grounded; the second end of C1 is used as the first control end of the boost control system; and the gate of the first switch tube Q1 is used as the second control end of the boost control system.

[0054] In a possible implementation, the electronic device adjusts the voltage of the heating film resistor by adjusting the first control signal of the first control end, including: the electronic device increases the voltage of the first control signal, and the voltage of the first end of the heating film resistor increases; the electronic device reduces the voltage of the first control signal, and the voltage of the first end of the heating film resistor decreases; the electronic device adjusts the conduction time of the heating film resistor by adjusting the second control signal of the second control end, including: the electronic device increases the duty cycle of the second control signal, and the conduction time of the heating film resistor increases; the electronic device reduces the duty cycle of the second control signal, and the conduction time of the heating film resistor decreases.

[0055] In a possible implementation, the boost control system further includes a voltage detection module, a current detection module and a current detection resistor R3; the source of Q5 is grounded, including: the source of Q5 is grounded through R3; the first end of R3 is grounded, and the second end of R3 is connected to the source of Q5 and the current detection module; the first end of the heating film resistor is connected to the voltage detection module; the method further includes: the electronic device obtains the voltage of the heating film resistor through the voltage detection module, and the electronic device obtains the current of the heating film resistor through the current detection module.

[0056] In a possible implementation, the boost control system includes a first inductor L1, a third switch tube Q3, a fourth switch tube Q4, a fifth switch tube Q5, and an output filter capacitor C3, including: the first end of L1 is connected to the first end of the interface module as the input end of the boost control system, and the second end of L1 is connected to the drain of Q3 and the drain of Q4; the source of Q3 is connected to the first end of C3 and one end of the heating film resistor; the source of Q4, the second end of C3 and the source of Q5 are all grounded; the second end of the heating film resistor is connected to the drain of Q5; the gate of Q3 and the gate of Q4 serve as the first control end of the boost control system, and the gate of Q5 serves as the second control end of the boost control system.

[0057] In a possible implementation, the electronic device further includes a middle frame and / or a back cover; the heating film resistor is located between the middle frame and the battery; or the heating film resistor is located between the back cover and the battery.

[0058] Among them, the beneficial effects of the second aspect are the same as the beneficial effects described in the above-mentioned first aspect and will not be repeated here.

[0059] In a third aspect, an embodiment of the present application provides an electronic device, which includes a temperature control circuit as described in the first aspect or any possible implementation of the first aspect.

[0060] In a fourth aspect, an embodiment of the present application provides a chip system, which includes a temperature control circuit as described in the first aspect or any possible implementation of the first aspect.

[0061] In a fifth aspect, an embodiment of the present application provides an electronic device, comprising one or more processors and one or more memories; the one or more processors are coupled to the one or more memories, the one or more memories are used to store computer program codes, the computer program codes include computer instructions, and when the one or more processors execute the computer instructions, the electronic device executes a temperature control method described in the second aspect or any possible implementation method of the second aspect.

[0062] In a sixth aspect, an embodiment of the present application provides a computer program product comprising instructions, which, when executed on an electronic device, enables the electronic device to execute a temperature control method as described in the second aspect or any possible implementation of the second aspect.

[0063] In a seventh aspect, an embodiment of the present application provides a computer-readable storage medium, comprising instructions, which, when executed on an electronic device, enable the electronic device to execute a temperature control method as described in the second aspect or any possible implementation of the second aspect.

[0064] In an eighth aspect, an embodiment of the present application provides a printed circuit board (PCB), which includes a temperature control circuit as described in the first aspect or any possible implementation of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 It is a schematic diagram of the hardware structure of an electronic device provided in an embodiment of the present application;

[0066] Figure 2A to Figure 2D It is a schematic diagram of a temperature control circuit structure proposed in an embodiment of the present application;

[0067] Figure 3 It is a flow chart of a temperature control method proposed in an embodiment of the present application;

[0068] Figure 4 It is a flow chart of another temperature control method proposed in an embodiment of the present application;

[0069] Figure 5 It is a flow chart of another temperature control method proposed in the embodiment of the present application;

[0070] Figure 6 It is a battery heating control circuit proposed in an embodiment of the present application;

[0071] Figure 7 It is a flow chart of a temperature control method proposed in an embodiment of the present application;

[0072] Figure 8 It is a battery heating control circuit proposed in an embodiment of the present application;

[0073] Fig. 9 It is a flow chart of a temperature control method proposed in an embodiment of the present application. DETAILED DESCRIPTION

[0074] The terms used in the following embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to be used as limitations to the present application. As used in the specification and appended claims of the present application, the singular expressions "one", "a kind of", "said", "above", "the" and "this" are intended to also include plural expressions, unless there is a clear indication to the contrary in the context. It should also be understood that the term "and / or" used in the present application refers to and includes any or all possible combinations of one or more listed items.

[0075] The electronic device in the embodiments of the present application can be a mobile phone, a tablet computer, a desktop, a laptop computer, a handheld computer, a smart bracelet, a super mobile personal computer, a netbook, a personal phone, a personal data assistant, an augmented reality (AR) / virtual reality (VR) and other touch screen devices. The present application does not limit the specific form of the electronic device.

[0076] The following is an introduction to the device involved in the embodiments of the present application.

[0077] Figure 1 A schematic diagram of the hardware structure of an electronic device provided in an embodiment of the present application.

[0078] The electronic device 100 may include a processor 110, an external memory interface 120, an internal memory 121, a universal serial bus (USB) interface 130, a charging management module 140, a power management module 141, a battery 142, an antenna 1, an antenna 2, a mobile communication module 150, a wireless communication module 160, an audio module 170, a speaker 170A, a receiver 170B, a microphone 170C, an earphone interface 170D, a sensor module 180, a button 190, a motor 191, an indicator 192, a camera 193, a display screen 194, and a subscriber identification module (SIM) card interface 195, etc. The sensor module 180 may include a pressure sensor 180A, a gyroscope sensor 180B, an air pressure sensor 180C, a magnetic sensor 180D, an acceleration sensor 180E, a distance sensor 180F, a proximity light sensor 180G, a fingerprint sensor 180H, a temperature sensor 180J, a touch sensor 180K, an ambient light sensor 180L, a bone conduction sensor 180M, etc.

[0079] It is to be understood that the structure illustrated in the embodiments of the present application does not constitute a specific limitation on the electronic device. In other embodiments of the present application, the electronic device may include more or fewer components than shown in the figure, or combine certain components, or split certain components, or arrange the components differently. The components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.

[0080] The processor 110 may include one or more processing units, for example, the processor 110 may include an application processor (AP), a modem processor, a graphics processor (GPU), an image signal processor (ISP), a controller, a memory, a video codec, a digital signal processor (DSP), a baseband processor, and / or a neural-network processing unit (NPU), etc. Different processing units may be independent devices or integrated into one or more processors.

[0081] The processor 110 may also be provided with a memory for storing instructions and data. In some embodiments, the memory in the processor 110 is a cache memory. The memory may store instructions or data that the processor 110 has just used or cyclically used. If the processor 110 needs to use the instruction or data again, it may be directly called from the memory. This avoids repeated access, reduces the waiting time of the processor 110, and thus improves the efficiency of the system.

[0082] It is understandable that the interface connection relationship between the modules illustrated in the embodiments of the present application is only a schematic illustration and does not constitute a structural limitation on the electronic device. In other embodiments of the present application, the electronic device may also adopt different interface connection methods in the above embodiments, or a combination of multiple interface connection methods.

[0083] The charging management module 140 is used to receive charging input from a charger. The charger may be a wireless charger or a wired charger. In some wired charging embodiments, the charging management module 140 may receive charging input from a wired charger through the USB interface 130. In some wireless charging embodiments, the charging management module 140 may receive wireless charging input through a wireless charging coil of the electronic device 100. While the charging management module 140 is charging the battery 142, it may also power the electronic device through the power management module 141.

[0084] The power management module 141 is used to connect the battery 142, the charging management module 140 and the processor 110. The power management module 141 receives input from the battery 142 and / or the charging management module 140, and supplies power to the processor 110, the internal memory 121, the external memory, the display screen 194, and the wireless communication module 160. The power management module 141 can also be used to monitor parameters such as battery capacity, battery cycle number, battery health status (leakage, impedance), etc. In some other embodiments, the power management module 141 can also be set in the processor 110. In other embodiments, the power management module 141 and the charging management module 140 can also be set in the same device.

[0085] The battery cannot be charged in a low temperature environment. For example, in the cold north in winter, the outdoor temperature is as low as minus 20 degrees Celsius. At this time, the battery charging temperature standard cannot be met and the battery cannot be charged. For example, in Harbin in winter, a mobile phone is charged with a power bank outdoors. In an environment with too low a temperature, the battery activity will be greatly reduced, and the battery internal resistance will increase, resulting in a large loss of battery power, slow charging speed, or even failure to charge.

[0086] Since the electronic device generates heat by itself, the temperature will rise to a certain level. However, if the device is only generating heat during operation, the temperature of the electronic device will rise slowly and the temperature rise will be limited. The battery still has a considerable internal resistance, which is not enough to ensure that the battery is within the normal charging temperature range during charging. Therefore, in an extremely low temperature environment, the terminal device needs to quickly increase the temperature during the charging process of the electronic device to resist the impact of the low temperature environment on the charging of the electronic device.

[0087] In one possible implementation, an electric heating film (heating film resistor) is attached to one side of the battery of the terminal device, and the heating film resistor can be powered on to heat the battery, so that the battery temperature rises. However, in a low temperature environment, when a user uses a mobile power bank to charge the battery outdoors, the charging power is low, and the general power supply power is only about 10W (5V2A). Therefore, the maximum heating power (25 / 2.5=10) can be achieved when the heating film resistor is 2.5 ohms. This can achieve the best heating effect, fast heating speed, and high efficiency.

[0088] The resistance of the heating film changes due to temperature changes. Generally, the higher the temperature, the greater the resistance of the heating film, and the lower the temperature, the smaller the resistance of the heating film. During the temperature change process, when the resistance of the heating film is less than 2.5 ohms, it will trigger the overcurrent protection of low-power devices such as power banks, and exceeding the rated power range will cause danger; when the resistance of the heating film is greater than 2.5 ohms, there is no way to meet the full power output of 10W, which affects the heating effect of the battery, prolongs the time for the battery temperature to rise to the safe charging temperature range, and the user charging experience is poor. Therefore, the driving power of the heating film resistor is approximately close to 10W, so as to achieve the fastest heating speed while not exceeding the power limit of low-power devices such as external power banks. However, as the resistance changes, the power of the heating film resistor is unstable, resulting in a contradiction between the high-power rapid heating of the heating film resistor and the low-current operation. In the actual heating film resistor heating process of the battery, it is difficult to simultaneously meet the requirements of faster heating speed and low current of the external charging module.

[0089] In view of the above situation, the present application proposes a temperature control circuit, method and electronic device. Among them, the electronic device may include an interface module and a heating film resistor connected to the electronic device through a boost control system, and the electronic device may boost the voltage input to the interface module, so that the voltage of the heating film resistor increases, the power of the heating film resistor increases, and the heating speed of the heating film resistor to the battery becomes faster. In addition, the electronic device can control the conduction and cutoff of the boost control system, as well as the magnitude of the voltage increase, to ensure faster heating speed and more accurate heating timing, and faster charging speed.

[0090] The electronic device may be a mobile phone, tablet, bracelet, electronic watch, or other terminal product. If the battery of the electronic device needs to be charged, the embodiment of the present application may be applicable to the product. The present application does not limit the product type of the electronic device.

[0091] Figure 2A to Figure 2D It is a schematic diagram of a set of temperature control circuit structures exemplarily proposed in the embodiments of the present application.

[0092] like Figure 2A As shown, the temperature control circuit may include an interface module, a boost control system, a heating film resistor, a voltage detection module, a current detection module, and a control module.

[0093] The interface module is connected to the input end of the boost control system (through the Vbus line), the output end of the boost control system is connected to the first end of the heating film resistor and the first end of the voltage detection module, and the second end of the heating film resistor is connected to the first end of the current detection module; the two output ends of the control module can be connected to the two control ends of the boost control system respectively. The second end of the current detection module and the second end of the voltage detection module can be connected to the two acquisition ends of the control module respectively, that is, the first acquisition end of the control module is connected to the output end of the voltage detection module, and the second acquisition end of the control module is connected to the output end of the current detection module.

[0094] The interface module can be connected to a charger. The electronic device can supply power to the battery and each module through the interface module. The interface module can be a Type-C interface type, a Micro USB interface type, or other interface types, etc., without limitation.

[0095] The boost control system is used to boost the input voltage of the interface module and provide the boosted voltage to the heating film resistor. The voltage detection module and the current detection module can measure the voltage and current of the heating film resistor respectively and send the measurement results to the control module. The boost control system may include a charge pump circuit (e.g. Figure 6 ), boost circuit (for example Figure 8 ) or boost circuits such as boost chips.

[0096] The control module can control the operation of the boost control system based on factors such as the current battery temperature and the voltage across the heating film resistor. For example, it can control the boost level and control the on and off of the boost control system. The control module can also control whether the battery switch module starts the battery charging path. The control module can be a processor (such as a CPU), a system on chip (SoC), and other modules, which are not specifically limited in this application.

[0097] The current detection module can detect the current flowing through the heating film resistor, and the voltage detection module can detect the voltage of the heating film resistor.

[0098] In addition, the temperature control circuit may also include a battery switching charger (SC) module and a battery, wherein the interface module (via the Vbus line) may also be connected to the input end of the battery switching module, and the output end of the battery switching module may be connected to the battery. When the interface module is connected to an external power source (charger or mobile power bank, etc.), if the battery switching module opens a charging path to the battery, the external power source may charge the battery. Of course, the interface module may also be connected to the battery via a power management unit (PMU) module. Figure 2A Not shown in FIG.

[0099] The battery has the function of storing electricity and supplying power to power-consuming devices of electronic equipment. The battery switch module can control the charging path of the battery and convert the voltage input by the interface module into a voltage suitable for charging the battery.

[0100] When a voltage is input to the heating film resistor, the heating film resistor can generate heat and heat the battery, that is, the battery temperature rises. Generally speaking, the resistance temperature coefficient of the heating film is positive, and the resistance of the heating film generally increases with increasing temperature. The heating film resistor is set on one or both sides of the battery. The distance between the heating film resistor and the battery can be less than 0.5mm. The heating film resistor can be close to the battery. The heating film resistor can be a sheet structure, or a wire structure, etc., without limitation. Optionally, the heating film resistor can be between the battery and the back cover of the electronic device; the heating film resistor can also be between the middle frame of the electronic device and the battery.

[0101] Optionally, the temperature control circuit may further include a battery temperature sensor (not shown). The battery temperature sensor may measure the battery temperature. The battery temperature sensor may be a thermistor. The control module may be connected to the battery temperature sensor, and the control module may obtain the battery temperature from the battery temperature sensor.

[0102] exist Figure 2A In the temperature control circuit structure, the boost control system may include a conduction control circuit and a boost circuit, wherein the conduction control circuit may control the conduction time of the heating film resistor, that is, control the conduction and cutoff of the power supply circuit to the heating film resistor. The boost circuit may boost the input voltage of the interface module and provide the boosted voltage to the heating film resistor. Figure 2B to Figure 2D The temperature control circuit structure shown in the figure illustrates the connection structure of the conduction control circuit and the boost circuit:

[0103] In one possible case, the boost control system is a series structure of a conduction control circuit and a boost circuit. Figure 2B As shown, the interface module can be connected to the first end of the conduction control circuit, the second end of the conduction control circuit is connected to the first end of the boost circuit, and the second end of the boost circuit is connected to the first end of the heating film resistor and the voltage detection module. Figure 2C As shown, the interface module can be connected to the first end of the boost circuit, the second end of the boost circuit is connected to the first end of the conduction control circuit, and the second end of the conduction control circuit is connected to the first end of the heating film resistor and the voltage detection module.

[0104] In another possible case, the boost circuit boosts the voltage at one end of the heating film resistor, and the conduction control circuit controls the conduction and cutoff of the heating film resistor at the other end of the heating film resistor. Figure 2DAs shown, the interface module can be connected to the first end of the boost circuit, the second end of the boost circuit is connected to the first end of the heating film resistor and the voltage detection module, and the second end of the heating film resistor is connected to one end of the conduction control circuit.

[0105] Above Figure 2B to Figure 2D In the temperature control circuit shown, the control end of the conduction control circuit is the second control end, and the control end of the boost circuit is the first control end. The conduction control circuit has the function of controlling the conduction and cutoff of the circuit, such as a switch tube, a triode and other modules, which are not limited. The boost circuit includes one of a charge pump circuit, a boost boost circuit or a boost chip, which are not limited.

[0106] Based on the above Figure 2A to Figure 2D The circuit structure of the charging system in Figure 3 illustrate Figure 2A to Figure 2D The temperature control method executed by the control module.

[0107] Figure 3 is a flow chart of a temperature control method disclosed in an embodiment of the present application. The temperature control method can be Figure 2A to Figure 2D The electronic device may include Figure 2A to Figure 2D In any module of the present invention, the temperature control method may include but is not limited to the following steps:

[0108] S301: The electronic device obtains a battery temperature when connected to an external power source.

[0109] When the electronic device detects an external power source, the battery temperature is obtained.

[0110] The electronic device may periodically collect the battery temperature through a battery temperature sensor.

[0111] The external power supply of the electronic device may be connected to a charger or a mobile power bank through an interface module, which is not limited in this application. Specifically, the control module may obtain the battery temperature through a battery temperature sensor and determine the most recently collected temperature as the battery temperature.

[0112] S302: The electronic device determines whether the battery temperature is less than a first temperature threshold. If the battery temperature is less than (less than or equal to) the first temperature threshold, S304 is executed; if the battery temperature is greater than or equal to (greater than) the first temperature threshold, S303 is executed.

[0113] The first temperature threshold may be a temperature range within which the battery can be charged, for example, the first temperature threshold is 0° C., 5° C., etc.

[0114] Optionally, when connected to an external power source, the electronic device periodically obtains the battery temperature and periodically determines whether the battery temperature is less than a first temperature threshold.

[0115] S303: The electronic device charges the battery normally.

[0116] When the battery temperature is greater than or equal to (greater than) the first temperature threshold, the electronic device charges the battery normally. Alternatively, when the electronic device determines that the battery temperature is greater than or equal to (greater than) the second temperature threshold, the battery can be charged normally.

[0117] S304: The electronic device starts the heating film resistor to start working.

[0118] The electronic device can output PWM1 through the first output terminal of the control module, and the first control terminal of the boost control system applies voltage to the heating film resistor. The second output terminal of the control module outputs a PWM2 signal, and the second control terminal of the boost control system controls the conduction and cutoff of the heating film resistor; controls the heating film resistor to start heating, so that the temperature of the battery is increased. Among them, PWM1 can control the boost control system to boost.

[0119] In S305~S307, after the heating film resistor starts working, it is ensured that the heating power is greater than the preset power, that is, there is a minimum heating power (preset power). When the heating power is increased to exceed the preset power, the subsequent S308 processing can be executed.

[0120] S305: The electronic device obtains the voltage of the heating film resistor and the current flowing through the heating film resistor to determine the heating power of the heating film resistor.

[0121] The electronic device can detect the voltage at the first end of the heating film resistor, that is, the heating film resistor voltage, through the voltage detection module, and obtain the current flowing through the heating film resistor through the current detection module.

[0122] A specific possible implementation method for the current detection module to obtain the current flowing through the heating film resistor: the current detection module can detect the voltage at one end of the current sensing resistor connected in series with the heating film resistor, and determine the current flowing through the heating film resistor based on the voltage and the resistance value of the current sensing resistor, wherein the current flowing through the heating film resistor is the ratio of the detection voltage of the current detection module to the resistance value of the current sensing resistor.

[0123] After the electronic device determines the voltage of the heating film resistor and the current flowing through the heating film resistor, the heating power P of the heating film resistor is determined. R1 is the heating film resistance voltage V R1 and the current I flowing through the heating film resistor R1 The product of. That is, power P R1 =V R1 *IR1 .

[0124] S306: Whether the resistance power of the heating film of the electronic device is greater than the preset power. If the resistance power of the heating film is greater than (greater than or equal to) the preset power, execute S308; if the resistance power of the heating film is less than or equal to (less than) the preset power, execute S307.

[0125] The preset power is a power value set in advance by the electronic device, and the preset power may range from 4W to 20W, for example, 10W. The above is only an exemplary description and is not limiting.

[0126] Optionally, S306 may also determine whether the heating film resistance voltage is greater than (greater than or equal to) a preset voltage. If it is greater than (greater than or equal to) the preset voltage, S308 may be executed; if it is less than or equal to (less than) the preset voltage, S307 may be executed. The preset voltage may range from 3V to 15V, for example, 7V, without limitation.

[0127] Among them, the preset power is the ratio of the square of the voltage of the heating film resistance to the resistance, that is, U 2 / R=W. Since R is the resistance value of the heating film resistor, W is the preset power of the heating film resistor. . is the resistivity of the heating film resistor. For example, if the heating film resistor is made of copper, Approx. L is the length of the heating film resistor; S is the cross-sectional area of ​​the current flowing through the heating film resistor. The heating film resistor will also change due to the change in temperature. Therefore, the power limitation can ensure the minimum value of the heating power, thereby ensuring faster heating.

[0128] S307: The electronic device increases the power of the heating film resistor. After executing S307, continue to execute S305.

[0129] The electronic device can increase the voltage at the first end of the heating film resistor and / or the conduction time of the heating film resistor.

[0130] The electronic device can increase the on-time of the on-control module in the boost control system by controlling the on-time. For example, the electronic device can increase the duty cycle of the second PWM2 signal, or increase the high level time of the second control signal.

[0131] Several different implementation methods for increasing the resistance voltage of the heating film are described below:

[0132] In a possible implementation, when the boost control system includes a Dickson circuit (boost circuit), the electronic device can increase the voltage of the first PWM1 signal through the control module, thereby increasing the voltage of the first end of the heating film resistor (such as Figure 6 ).

[0133] In another possible implementation, when the boost control system includes a boost circuit, the electronic device can adjust the duty ratio of the two PWM signals through the control module to increase the voltage at the first end of the heating film resistor (eg Figure 8 ).

[0134] In another possible implementation, when the boost control system includes a boost chip (boost circuit), the electronic device may directly control the boost chip through a control module to increase the voltage at the first end of the heating film resistor.

[0135] During the processing of S305 to S307, if the preset power does not meet the standard, the electronic device will continue to loop through steps S305 to S307 until the power is greater than the preset power, then exit the loop and execute S308.

[0136] The following S308 to S315 illustrate that the electronic device adjusts the on-time of the heating film resistor based on the magnitude relationship between the battery temperature and the second temperature threshold.

[0137] S308-S309: adjusting the on-time of the heating film resistor based on the magnitude relationship between the battery temperature and the first temperature threshold.

[0138] S308: The electronic device determines whether the battery temperature is greater than a first temperature threshold. If the battery temperature is greater than (greater than or equal to) the first temperature threshold, S310 is executed. If the battery temperature is less than or equal to (less than) the first temperature threshold, S309 is executed.

[0139] When the heating film resistance voltage is greater than (greater than or equal to) the preset voltage value, the electronic device can determine whether the battery temperature is greater than (greater than or equal to) the first temperature threshold. The first temperature threshold can refer to the relevant content of S302 and will not be described in detail.

[0140] S309: The electronic device increases the conduction time of the heating film resistor.

[0141] When the battery temperature is less than or equal to (less than) the first temperature threshold, the electronic device may increase the conduction time of the heating film resistor. After executing S309, continue to execute S305.

[0142] The electronic device can control the on and off of the heating film resistor through the second pulse width modulation signal PWM2 of the control module. When the duty cycle of the second pulse width modulation signal PWM2 is increased, the electronic device can increase the on time of the heating film resistor.

[0143] Optionally, the electronic device may be provided with different duty cycle gears of PWM2. When the current PWM2 gear is known, a PWM2 with a larger duty cycle is selected. Exemplarily, the different duty cycle gears of PWM2 are 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100% from low to high. When the current gear (duty cycle) is 20% and the duty cycle gear needs to be increased, the gear can be adjusted to 30% or 40%, etc., and the adjusted gear is greater than 20%.

[0144] Optionally, in the case where the boost control system is a boost chip, the on-time of the boost control system may be adjusted by controlling the boost chip.

[0145] Optionally, the control module of the electronic device may control the time it takes for the second control signal to reach a high level to increase.

[0146] S310: The electronic device starts charging the battery.

[0147] If the battery temperature is greater than (greater than or equal to) the first temperature threshold in S308 or if it is determined in S313 that the temperature has not dropped, the battery starts to be charged. The electronic device can control the conduction control module to be turned on and allocate part of the power to charge the battery. After the electronic device is connected to the external power supply, the external power supply does not start to charge the battery when S304 to S309 are executed for the first time.

[0148] In the embodiment of the present application, during normal charging, the charging power is relatively large, and the heating film resistor does not occupy power (in S303). In S310, when the battery starts to charge, it is generally not charged at full power, but at partial power.

[0149] S311: The electronic device determines whether the battery temperature is greater than a second temperature threshold. If the battery temperature is greater than (greater than or equal to) the second temperature threshold, S312 is executed; if the battery temperature is less than or equal to (less than) the second temperature threshold, S313 is executed.

[0150] After executing S310, the electronic device may determine whether the battery temperature is greater than a second temperature threshold. The specific execution of S310 may refer to the relevant description of S307, which will not be described in detail.

[0151] The second temperature threshold is greater than the first temperature threshold. The second temperature threshold may be in the range of 5 to 20 degrees Celsius, without limitation. For example, the first temperature threshold is 10 degrees Celsius and the second temperature threshold is 0 degrees Celsius.

[0152] S312: The electronic device controls the heating film resistor to stop working.

[0153] When the battery temperature is less than or equal to (less than) the second temperature threshold, the electronic device can control PWM2 to a low level through the control module, and the heating film resistor is turned off, that is, heating is stopped. After executing S312, the electronic device executes S303 to further monitor the battery temperature to ensure that the battery temperature is above the first temperature threshold during charging.

[0154] S313: The electronic device determines whether the battery temperature drops. If the battery temperature drops, the electronic device executes S314. If the battery temperature does not drop, the electronic device executes S315.

[0155] The electronic device can collect the N battery temperature values ​​collected continuously recently (the result of periodic collection), and judge whether the battery temperature drops based on the N battery temperatures. N is an integer greater than 2. Optionally, whether the difference between the temperature values ​​collected by the electronic device from the earliest to the latest time is greater than 0, the electronic device can determine that the temperature drops. Otherwise, the battery temperature does not drop.

[0156] For example, the temperatures collected in sequence from far to near are t1, t2, and t3. Among them, t1-t2 is greater than 0, and t2-t3 is greater than 0, so it can be determined that the battery temperature is decreasing. t1-t2 is less than 0, and t2-t3 is equal to 0, so it can be determined that the battery temperature is not decreasing.

[0157] S314: The electronic device reduces the conduction time of the heating film resistor.

[0158] When the battery temperature does not drop at S313, the electronic device reduces the conduction time of the heating film resistor.

[0159] Optionally, the electronic device may be provided with different duty cycle gears of PWM2, and in the case of the current PWM2 gear, a PWM2 with a larger duty cycle is selected. Exemplarily, the gears of different duty cycles of PWM2 are 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100% from low to high. When the current gear is 70%, the gear needs to be adjusted down, and the gear can be adjusted to 60% or 50%, etc., and the adjusted gear can be less than 70%. The electronic device can reduce the duty cycle of PWM2 through the control module, thereby reducing the conduction time of the heating film resistor.

[0160] Optionally, in the case where the boost control system is a boost chip, the on-time of the boost control system may be reduced by controlling the boost chip.

[0161] S315: The electronic device increases the conduction time of the heating film resistor. After executing S315, continue to execute S308.

[0162] In the case where the battery temperature drops in S313, the electronic device increases the conduction time of the heating film resistor. S315 may refer to the relevant description of S309 and will not be described in detail.

[0163] During the execution of S308 to S315, when the battery temperature is within the range from the first temperature threshold to the second temperature threshold, the electronic device can reduce the on-time when the battery temperature rises, and provide more power to the battery for charging. In order to maintain the battery temperature, when the battery temperature drops, the on-time is increased to ensure that the battery temperature is within the chargeable adjustment range. The above process can adapt to the specific charging process. During the charging process, the heat generated by the battery and the heat generated by the electric heating film resistor can gradually reduce the heat generation power, provide more power to the battery, and maintain the charging temperature, providing a good charging temperature and rate.

[0164] It should be noted that when charging is completed (for example, the battery is fully charged) or the external power supply is disconnected, the above Figure 3 The processing process ends, that is, no PWM1 and PWM2 electrical signals are provided.

[0165] Based on the above Figure 2A to Figure 2D The circuit structure of the charging system in Figure 4 illustrate Figure 2A to Figure 2D The temperature control method executed by the control module.

[0166] Figure 4 is a flow chart of another temperature control method disclosed in an embodiment of the present application. The temperature control method can be Figure 2A to Figure 2D The electronic device may include Figure 2A to Figure 2D In any module of the present invention, the temperature control method may include but is not limited to the following steps:

[0167] S401: The electronic device obtains a battery temperature when connected to an external power source.

[0168] S402: The electronic device determines whether the battery temperature is less than a first temperature threshold. If the battery temperature is less than (less than or equal to) the first temperature threshold, S404 is executed; if the battery temperature is greater than or equal to (greater than) the first temperature threshold, S403 is executed.

[0169] Among them, S402 can refer to the relevant contents of S307 and S302 without limitation.

[0170] S403: The electronic device charges the battery normally.

[0171] Among them, S401~S403 can refer to the relevant content of S301~S303.

[0172] S404: The electronic device starts the heating film resistor to start working. After executing S404, the electronic device executes S405.

[0173] When the electronic device determines that the battery temperature is less than the first temperature threshold, the control module controls the boost circuit to output the voltage according to the first power, and the voltage and frequency of the first control signal are relatively high, for example, the voltage is 5V, the voltage of the highest gear, etc., and can also be 3V, etc., without limitation. In this way, it is ensured that the battery can be heated up quickly. The control module controls the boost control system to be turned on, and the duty cycle of the second control signal PWM2 can be 100% or 80%. At this time, the duty cycle is as large as possible, even if it is heated quickly.

[0174] In S404, the electronic device may perform heating according to the full power of the heating film resistor, that is, control the signals of the two control terminals according to a specific voltage and a duty cycle to ensure the heating speed.

[0175] S405: The electronic device determines whether the battery temperature is greater than a second temperature threshold. If the battery temperature is greater than (greater than or equal to) the second temperature threshold, S407 is executed; if the battery temperature is less than or equal to (less than) the second temperature threshold, S406 is executed.

[0176] Among them, S405 can refer to the relevant content of S311 and will not be repeated here.

[0177] S406: The heating film resistor of the electronic device continues to work for the first time period. After executing S406, the electronic device executes S405.

[0178] When the battery temperature of the electronic device is less than or equal to (less than) the second temperature threshold, heating can be continued for a period of time, and the first time length can be 0.5-8 minutes, for example, 2 minutes.

[0179] S407: The electronic device controls the heating film resistor to stop working. After executing S407, the electronic device executes S403.

[0180] After the temperature of the electronic device is greater than the second temperature threshold, the heating may be stopped. For details, please refer to the relevant content of S312, which will not be described in detail.

[0181] In the above process, when the battery temperature of the electronic device is less than or equal to (less than) the second temperature threshold, heating can be continued for a period of time. During this period of time, the battery temperature is ensured to rise, and it is continued to be determined whether it is greater than the second temperature threshold until the temperature rises to the second temperature threshold, and heating is stopped and normal charging begins.

[0182] Based on the above Figure 2A to Figure 2D The circuit structure of the charging system in Figure 5 illustrate Figure 2A to Figure 2D The temperature control method executed by the control module.

[0183] Figure 5 is a flow chart of another temperature control method disclosed in the embodiment of the present application. The temperature control method can be Figure 2A to Figure 2D The electronic device may include Figure 2A to Figure 2D In any module of the present invention, the temperature control method may include but is not limited to the following steps:

[0184] S501: The electronic device obtains the battery temperature when connected to an external power source. After S501 is executed, S502 is executed.

[0185] The execution process of S501 may refer to the relevant description of S301 and S401, which will not be described in detail.

[0186] S502: The electronic device determines whether the battery temperature is less than a first temperature threshold. If the battery temperature is less than (less than or equal to) the first temperature threshold, S504 is executed; if the battery temperature is greater than or equal to (greater than) the first temperature threshold, S503 is executed.

[0187] Among them, S503 can refer to the relevant description of S403 and S302, which will not be repeated here.

[0188] S503: The electronic device charges the battery normally. After S503 is executed, S501 is executed to continue to obtain the battery temperature.

[0189] Among them, S503 can refer to the relevant description of S403 and S303, which will not be repeated here.

[0190] In S501~S503, since the electronic device can always obtain the battery temperature, determine whether the battery temperature is greater than the first temperature threshold, ensure that the battery temperature is in a temperature environment that can be charged, start charging, ensure that the charging temperature environment can be maintained in a temperature environment suitable for charging, and improve charging efficiency.

[0191] S504: The electronic device starts the heating film resistor to start working.

[0192] The processing process of S504 may refer to the relevant content of S303 and will not be described in detail.

[0193] Next, in S505-S507, after the heating film resistor starts working, it is ensured that the heating power is greater than the preset power, that is, there is a minimum heating power. When the heating power is increased to exceed the preset power, the subsequent S508 processing is executed.

[0194] S505: The electronic device obtains the voltage of the heating film resistor and the current flowing through the heating film resistor to determine the heating power of the heating film resistor.

[0195] The execution process of S505 may refer to the relevant contents of S304 and will not be described in detail.

[0196] S506: Whether the resistance power of the heating film of the electronic device is greater than the preset power.

[0197] S507: The electronic device increases the power of the heating film resistor.

[0198] Among them, the relevant descriptions of S505~S507 can refer to the relevant descriptions of S305~S307, and are not repeated here.

[0199] S508-S510: When the battery temperature of the electronic device is lower than the first temperature threshold, there is a minimum heating rate, and the duty cycle is increased to improve the heating rate and accelerate the increase of the battery temperature.

[0200] S508: The electronic device determines whether the battery temperature is greater than a first temperature threshold. If the battery temperature is greater than (greater than or equal to) the first temperature threshold, S511 is executed; if the battery temperature is less than or equal to (less than) the first temperature threshold, S509 is executed.

[0201] The specific execution of S508 may refer to the related descriptions of S308 and S302, which will not be described in detail.

[0202] S509: Whether the temperature increase rate of the electronic device is greater than the first threshold rate. If the temperature increase rate is greater than (greater than or equal to) the first threshold rate, execute S508; if the temperature increase rate is less than or equal to (less than) the first threshold rate, execute S510.

[0203] When the battery temperature is less than or equal to (less than) the first temperature threshold, the electronic device can obtain the battery temperature, determine the temperature increase rate, and then determine whether the temperature increase rate is greater than the first threshold rate.

[0204] The first threshold rate may range from 0.1°C / min (degrees Celsius per minute) to 10°C / min.

[0205] The electronic device obtains the battery temperature and determines the temperature rise rate. Specifically, the electronic device can obtain the battery temperature M times continuously to obtain M battery temperatures T1, T2, ..., TM (the unit can be degrees Celsius); M acquisition times t1, t2, ..., tM (time points). M is an integer greater than 2. The average of M-1 Si=(Ti-Ti-1) / (ti-ti-1) is calculated as the temperature rise rate. Among them, i is an integer from 2 to M respectively. Ti is the battery temperature collected at time ti, and there is a one-to-one correspondence. The above is only an optional scheme. The electronic device can periodically collect results to calculate the battery temperature, or the intermittent temperature change rate, etc., which is not limited in this application. Among them, in order to ensure the sensitivity and timeliness of electronic devices to changes in the temperature change rate, the collection time or the number of collections M should be limited, for example, M is less than 8 or the continuous collection time is less than 30s.

[0206] S510: The electronic device increases the on-time of the heating film resistor. After executing S510, execute S508.

[0207] When the temperature increase rate is less than or equal to (less than) a first threshold rate, the electronic device increases the on-time of the heating film resistor.

[0208] Among them, S510 can refer to the relevant description of S309 and will not be repeated here.

[0209] S511: The electronic device starts charging the battery.

[0210] Among them, S511 can refer to the relevant description of S310 and will not be repeated here.

[0211] S512-S521: The electronic device controls the temperature increase rate of the battery to increase the temperature within a first temperature rate range.

[0212] The following S512-S519 illustrate that the electronic device adjusts the conduction time of the heating film resistor based on the relationship between the first temperature rise rate and the upper and lower temperature rates of the first temperature rate range. In this way, the temperature rise rate of the battery temperature can be controlled to rise steadily within the first temperature rate range, balancing the heating power of the charging power, ensuring a normal charging temperature environment, and speeding up the charging speed.

[0213] S512: The electronic device obtains the battery temperature and determines the temperature increase rate.

[0214] Among them, S512 can refer to the relevant description of the electronic device obtaining the battery temperature and determining the temperature rise rate in S509, which is not repeated here.

[0215] The electronic device can switch the position relationship from the first position to the second position,

[0216] S513: The electronic device determines whether the temperature increase rate is greater than the upper limit temperature increase rate. If the temperature increase rate is greater than the upper limit temperature increase rate, execute S514; otherwise, execute S515.

[0217] Among them, the electronic device is provided with a first temperature rate range, and the first temperature rate range has an upper limit temperature increase rate and a lower limit temperature increase rate. Exemplarily, the first temperature rate range is 0.5 degrees Celsius per minute to 5 degrees Celsius per minute, the upper limit temperature increase rate is 5 degrees Celsius per minute, and the lower limit temperature increase rate is 0.5 degrees Celsius per minute. The range of the lower limit temperature increase rate can be 0.2 to 3 degrees Celsius per minute; the range of the upper limit temperature increase rate can be 1.5 to 10 degrees Celsius per minute. The lower limit temperature increase rate is less than the upper limit temperature increase rate.

[0218] S514: The electronic device reduces the conduction time of the heating film resistor. After executing S514, execute S518.

[0219] Among them, S514 can refer to the relevant description of S314 and will not be repeated here.

[0220] S515: The electronic device determines whether the temperature increase rate is less than the lower temperature increase rate. If the temperature increase rate is less than the lower temperature increase rate, execute S516; otherwise, execute S517.

[0221] As mentioned above, the execution order of S513 and S515 is not limited. S513 may be executed first and then S515, or S515 may be executed first and then S513. This application does not limit this.

[0222] S516: The electronic device increases the on-time of the heating film resistor. After executing S516, execute S518.

[0223] Among them, S516 can refer to the relevant description of S309 and will not be repeated here.

[0224] S517: The electronic device determines whether the battery temperature is greater than a second temperature threshold. If the battery temperature is greater than (greater than or equal to) the second temperature threshold, S521 is executed; if the battery temperature is less than or equal to (less than) the second temperature threshold, S520 is executed.

[0225] S518: The electronic device obtains the battery temperature and determines the temperature increase rate. After executing S518, execute S519.

[0226] The execution process of S518 may refer to the relevant descriptions of S509 and S512 and will not be described in detail.

[0227] S519: The electronic device determines whether the temperature increase rate is within the first temperature rate range. If the temperature increase rate is within the first temperature rate range, S517 can be executed; if the temperature increase rate is outside the first temperature rate range, S512 is executed.

[0228] S520: The heating film resistor of the electronic device continues to work for a first time period. After executing S520, execute S512.

[0229] Among them, S520 can refer to the relevant description of S406 and will not be repeated here.

[0230] S521: The electronic device controls the heating film resistor to stop working. After executing S521, S503 is executed.

[0231] For the related description of S521, reference may be made to the related description of S312.

[0232] During the execution of S512 to S519, the electronic device may determine a method for adjusting the conduction time of the heating film resistor based on the magnitude relationship of the temperature increase rate in the first temperature rate range.

[0233] Optionally, the electronic device may not execute S518 and S519, and directly execute S512 after executing S514 and S516.

[0234] Optionally, S512~S519 can be replaced as follows: after S512, the electronic device determines whether the temperature rise rate is within the first temperature rate range. When the temperature rise rate is within the first temperature rate range, the electronic device executes S517; when the temperature rise rate is outside the first temperature rate range, the electronic device further determines whether the temperature rise rate is greater than the upper limit temperature rate or less than the lower limit temperature rate. When the temperature rise rate is greater than the upper limit temperature rate, S514 is executed and the process of determining whether the temperature rise rate is within the first temperature rate range is re-executed; when the temperature rise rate is less than the lower limit temperature rate, S516 is executed and the process of determining whether the temperature rise rate is within the first temperature rate range is re-executed.

[0235] During the execution of the above S512-S521, the temperature rate can be steadily increased within a certain range by limiting the first temperature rate range and the upper and lower limits until it is greater than the second temperature threshold, and normal charging is performed. The above process can ensure that the temperature can rise steadily, enter a temperature environment that can be charged efficiently, and speed up the battery charging rate.

[0236] Based on the above Figure 2A to Figure 2D The circuit structure and Figure 3~Figure 5The present application specifically proposes the following two possible embodiments. The following two temperature control circuits can be used to control the heating of the battery.

[0237] Embodiment 1: A temperature control circuit and a temperature control method combined with a Dickson circuit.

[0238] Figure 6 This is a battery heating control circuit exemplarily disclosed in the embodiments of this application. Figure 6 As shown, the battery heating control circuit may include an interface module, a boost control system, a heating film resistor R1, a first ADC (current detection module), a second ADC (voltage detection module), and a control module. Among them, the boost control system includes a first diode D1, a second diode D2, a first capacitor C1, a second capacitor C2, a current detection resistor R2, and a first switch tube Q1.

[0239] Among them, the anode of the first diode D1 is connected to the first end of the interface module as the input end of the boost control system, and the cathode of the first diode D1 is connected to the anode of the second diode D2 and the first end of the first capacitor C1; the cathode of the second diode D2 is connected to the first end of the second capacitor C2, and is connected to the first end of the heating film resistor R1 and the second ADC as the output end of the boost control system. The second end of the second capacitor C2 and the first end of the current sensing resistor R2 are grounded. The second end of the current sensing resistor R2 is connected to the source Source of the first switch tube Q1 and the first ADC, and the drain Drain of the first switch tube Q1 is connected to the second end of the heating film resistor R1. The second end of the first capacitor C1 is connected to the first output end of the control module as the first control end of the boost control system. The gate Gate of Q1 is connected to the second output end of the control module as the second control end of the boost control system. The output end of the first ADC is connected to the first sampling end of the control module; the output end of the second ADC is connected to the second sampling end of the control module.

[0240] Optionally, the first switch tube Q1 can be replaced by other modules that can control the switch, such as Figure 6 The first switch tube Q1 is described by taking an N-type MOS tube as an example. The first switch tube Q1 can also be other types of MOS tubes, triodes and other devices, devices that control switch functions, etc., which are not limited in the present application.

[0241] Among them, ADC can collect voltage and obtain the voltage magnitude of the current detected position. The terminal device can use the second ADC (which can be understood as Figure 2A The voltage detection module in the first ADC (which can be understood as Figure 2AThe current detection module in the circuit can read the low voltage value of the heating film resistor R1, and determine the current flowing through the current detection resistor based on the voltage value and the resistance value of R2. The working process of the first ADC and the second ADC can refer to Figure 2A The relevant content in will not be repeated here.

[0242] The first diode D1 and the second diode D2 may be Schottky diodes or ordinary diodes, which is not limited in the present application.

[0243] The first output terminal and the second output terminal of the control module can control the on / off of the boost control system and the boost level. The first output terminal of the control module can send a PWM1 signal to the second terminal of C1 of the boost control system (the first control terminal S1 of the boost control system), and the voltage value of R1 can be adjusted by adjusting the voltage value of the PWM1 signal. The second output terminal of the control module can send a PWM2 signal to the gate of Q1 of the boost control system (the second control terminal S2 of the boost control system), and the heating time (on time) of R1 can be adjusted by adjusting the duty cycle of the PWM2 signal.

[0244] In the first embodiment, when the interface module is connected to an external power supply, if Q1 is in the on state, the interface module provides voltage to the heating film resistor R1 through D1 and D2. If Q1 is in the off state, the interface module cannot provide voltage to the heating film resistor R1 through D1 and D2. The longer the Q1 is in the on state, the longer the power supply time to the heating film resistor R1 is, the faster the heating film resistor R1 is heated, and the higher the efficiency is.

[0245] In the first embodiment, when the interface module is connected to an external power supply and Q1 is in the on state, the PWM1 signal applies a signal to C1 to work. In the periodic operation process of PWM1, it can be divided into two stages, a stage without input signal and a stage with high voltage input. In the stage without input signal, no voltage is input to the second end of C1, and the voltage at the first end of R1 is the voltage output from the interface module after two voltage drops of D1 and D2. The voltage at the first end of C1 is the voltage of the interface module after the voltage drop of D1, and the voltage at the second end of C1 is 0, so the voltage difference between the two ends of the first capacitor C1 is the voltage value of the first end of C1. In the high voltage input stage, the voltage at the second end of C1 becomes the high voltage output by PWM1, and there is a certain voltage difference between the two ends of C1 (the voltage difference formed in the previous stage), which increases the voltage at the first end of C1, so the voltage at the first end of D2 increases, causing the voltage at the second end of D2 to also increase, and therefore, the voltage of the heating film resistor R1 increases. Therefore, the increase in the signal voltage of the first pulse width modulation signal PWM1 will increase the voltage at the first end of the heating film resistor R1.

[0246] Optionally, Figure 2AThe Vbus line of the interface module can also be connected to the battery through the charging control system. Figure 2A The instructions in are not repeated here.

[0247] also, Figure 6 For detailed description of each module, please refer to Figure 2A The relevant description in is not repeated here.

[0248] like Figure 6 As shown, in the embodiment of the present application, the heating module resistor is used to adjust the battery temperature, and the heating module resistor is placed on one side of the battery. The heating module resistor converts electrical energy into heat energy and transfers it to the battery, so that the battery temperature increases.

[0249] Based on the above Figure 6 The circuit structure of the charging system in Figure 7 illustrate Figure 6 The temperature control method executed by the control module.

[0250] Figure 7 is a flow chart of a temperature control method disclosed in an embodiment of the present application. The temperature control method can be Figure 6 The electronic device may include Figure 7 In any module of the present invention, the temperature control method may include but is not limited to the following steps:

[0251] S701: The electronic device obtains a battery temperature when connected to an external power source.

[0252] S702: The electronic device determines whether the battery temperature is less than a first temperature threshold. If the battery temperature is less than (less than or equal to) the first temperature threshold, S704 is executed; if the battery temperature is greater than or equal to (greater than) the first temperature threshold, S703 is executed.

[0253] S703: The electronic device charges the battery normally.

[0254] S704: The electronic device starts the heating film resistor to start working.

[0255] The electronic device can determine the first voltage of the PWM1 signal at the first output terminal and the first duty cycle D of the PWM2 signal at the second output terminal through the control module, and then control the heating film resistor to heat according to the first voltage and the second PWM duty cycle D. That is, the heating can be controlled to start. Before S703, the boost control system is turned off and the heating film resistor does not work.

[0256] When the battery temperature is less than (less than or equal to) the first temperature threshold, the electronic device can determine the voltage of the first PWM and the duty cycle D of the second PWM. The first PWM is the first pulse width modulation signal PWM1 in the second embodiment; the second PWM is the second pulse width modulation signal PWM2. The range of D is 0% to 100%. For example, 50%, 60%, 70%, 80%, 90%, etc.

[0257] Optionally, the first PWM frequency may be determined as f1, and the control module may adjust the frequency f1, thereby adjusting the driving capability of the boost control system to ensure that the electronic device is charged and discharged more fully. The range of f1 is 20KHz~1MHz.

[0258] S705: The electronic device obtains the voltage of the heating film resistor and the current flowing through the heating film resistor to determine the heating power of the heating film resistor.

[0259] The electronic device can read the voltage value V1 of the second ADC, the voltage value V2 of the first ADC, and the temperature value of the battery temperature sensor (battery temperature T1) through the control module. After obtaining the voltage value V2 of the first ADC, the current I flowing through the heating film resistor can be calculated as V2 / R2 through the current detection resistor R2.

[0260] S706: Is the power of the heating film resistance of the electronic device greater than (greater than or equal to) the preset power? If the power of the heating film resistance is greater than (greater than or equal to) the preset power, execute S708; if the power of the heating film resistance is less than or equal to (less than) the preset power, execute S707.

[0261] Among them, S701~S706 can refer to Figure 3 The relevant descriptions of S301~S306 are not repeated here.

[0262] S707: The electronic device increases the voltage of PWM1. After S707 is executed, S705 is continued to be executed.

[0263] The electronic device can control the voltage increase of the PWM1 signal through the first output terminal of the control module. For example, the electronic device can be set with multiple voltage gears, and according to the current voltage gear, adjust to a larger voltage gear direction. The electronic device can determine that the battery temperature is not high enough, increase the voltage of PWM1, and increase the voltage of the heating film resistor, so that the battery is heated as soon as possible and the heating time is shortened.

[0264] The electronic device can control the voltage increase of the PWM1 signal through the first output terminal of the control module. For example, the electronic device can be provided with multiple voltage gears, and according to the current voltage gear, the voltage gear is adjusted toward a larger direction.

[0265] The electronic device can determine that the battery temperature is not high enough, increase the voltage of PWM1, and increase the voltage of the heating film resistor, so that the battery is heated as quickly as possible and the heating time is shortened.

[0266] During the processing of S705 to S707, if the preset power does not meet the standard, the electronic device will continue to loop through steps S705 to S707 until the power is greater than the preset power, then exit the loop and execute S708.

[0267] S708: The electronic device determines whether the battery temperature is greater than (greater than or equal to) a first temperature threshold. If the battery temperature is greater than (greater than or equal to) the first temperature threshold, S710 is executed. If the battery temperature is less than or equal to (less than) the first temperature threshold, S709 is executed.

[0268] S709: The electronic device increases the duty cycle of PWM2.

[0269] S710: The electronic device starts charging the battery.

[0270] S711: The electronic device determines whether the battery temperature is greater than a second temperature threshold. If the battery temperature is greater than (greater than or equal to) the second temperature threshold, S712 is executed; if the battery temperature is less than or equal to (less than) the second temperature threshold, S713 is executed.

[0271] S712: The electronic device controls the heating film resistor to stop working.

[0272] S713: The electronic device determines whether the battery temperature drops. If the battery temperature drops, the electronic device executes S715. If the battery temperature does not drop, the electronic device executes S714.

[0273] S714: The electronic device reduces the duty cycle of PWM2.

[0274] During the above heating process, the temperature remains unchanged and is suitable for the charging environment, thereby reducing the duty cycle of PWM2 to save power, so that the battery can be charged with greater power and faster speed.

[0275] The electronic device can be provided with different duty cycle gears of PWM2, and in the case of the current PWM2 gear, a PWM2 with a larger duty cycle is selected. Exemplarily, the different duty cycle gears of PWM2 are 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100% from low to high. When the current gear is 70%, the gear needs to be adjusted down, and the gear can be adjusted to 60% or 50%, etc., and the adjusted gear can be less than 70%. The electronic device can reduce the duty cycle of PWM2 through the control module, thereby reducing the conduction time of the heating film resistor.

[0276] During the above heating process, the temperature remains unchanged and is suitable for the charging environment, thus reducing the duty cycle of PWM2 to save power, thereby making the battery charge with greater power and faster charging speed.

[0277] When it is determined that the battery temperature does not decrease, the duty cycle of PWM2 is reduced to reduce the heat generation power, provide more power to the battery, and speed up the charging speed. When it is determined that the battery temperature decreases, it is necessary to further ensure that the temperature rises to a temperature environment suitable for charging, so the duty cycle of PWM2 is increased to ensure the prerequisite environment for charging.

[0278] S715: The electronic device increases the duty cycle of PWM2. After executing S715, the process continues to execute S708.

[0279] In S713, when the battery temperature drops, the electronic device increases the conduction time of the heating film resistor. S715 can refer to the relevant description of S709 and will not be repeated here.

[0280] Optionally, for a temperature control circuit combined with a Dickson circuit, the present application may also be implemented by Figure 4 or Figure 5 The temperature control method is not limited to Figure 3 (Right now Figure 7 The charging method is controlled by the above Figure 4 and Figure 5 The description is not repeated here.

[0281] In the process of executing S708~S715 above, when the battery temperature is within the range of the first temperature threshold to the second temperature threshold, the electronic device can reduce the on-time when the battery temperature rises, and provide more power to the battery for charging. In order to maintain the battery temperature, when the battery temperature drops, the on-time is increased to ensure that the battery temperature is within the chargeable range. The above process can adapt to the specific charging process. During the charging process, the heating of the battery plus the heating of the electric heating film resistor can gradually reduce the heating power, provide more power to the battery, and maintain the charging temperature, providing a good charging temperature and rate. The electronic device can flexibly adjust the voltage, power and time of the heating film resistor based on the size and change trend of the battery temperature, ensure that the battery temperature is in an environment suitable for charging when the battery is charging, ensure heating efficiency, create a good temperature environment for charging, and improve the user's charging experience in a low temperature environment.

[0282] It should be noted that when charging is completed (for example, the battery is fully charged) or the external power supply is disconnected, the above Figure 3 The processing process ends, that is, no PWM1 and PWM2 signals are provided.

[0283] Embodiment 2: A temperature control circuit and a temperature control method combined with a Boost circuit.

[0284] Figure 8 This is a battery heating control circuit exemplarily disclosed in the embodiments of this application. Figure 8 As shown, the battery heating control circuit (temperature control circuit) may include an interface module, a boost control system, a heating film resistor R1, a first ADC (current detection module), a second ADC (voltage detection module), and a control module. The boost control system may include a first inductor L1, a third switch tube Q3, a fourth switch tube Q4, a fifth switch tube Q5, an output filter capacitor C3, and a current sensing resistor R3.

[0285] Among them, the first end of the first inductor L1 can be connected to one end of the interface module as the input end of the boost control system, and the second end of the first inductor L1 can be connected to the drain of the third switch tube Q3 and the drain of the fourth switch tube Q4. The source of the third switch tube Q3 can be connected to the first end of the output filter capacitor C3, the first end of the heating film resistor R1 and the second ADC. The source of the fourth switch tube Q4, the second end of the output filter capacitor C3 and the first end of the current detection resistor R3 are all grounded. The second end of the heating film resistor R1 is connected to the drain of the fifth switch tube Q5, and the source of the fifth switch tube Q5 is connected to the second end of the current detection resistor R3 and the first ADC. The control module may include three output ends connected to the three control ends of the boost control system respectively. Among them, the third output end S3 of the control module is connected to the gate Gate of Q3 (the control module controls Q3 through the PMW3 signal), and the fourth output end S4 of the control module is connected to the gate Gate of Q4 (the control module controls Q4 through the PMW4 signal). The control module can control the conduction and cutoff of Q3 and Q4 through S3 and S4 respectively. At this time, S3 and S4 are used as Figure 2A The first control terminal of the boost control system and the first output terminal of the control module. The fifth output terminal S5 of the control module is connected to the gate Gate of Q5 (the control module controls the conduction and cutoff of Q5 through the PMW5 signal). At this time, S5 acts as Figure 2A A second control end of the boost control system and a second output end of the control module.

[0286] Figure 8 The connection mode and working principle between the control module and the first ADC and the second ADC can be referred to Figure 2A to Figure 2D and Figure 6 The relevant content in will not be repeated here.

[0287] In the second embodiment, the control module needs to adjust the duty cycle of PWM3 and PWM4 at the same time, so as to adjust the voltage value of the first end of R1. The boost control system includes two working stages: stage one, Q4 is turned on, Q3 is turned off; stage two, Q4 is turned off, Q3 is turned on. In stage one, Q4 is turned on and Q3 is turned off, the interface module charges L1, and the inductor current increases. In stage two, Q4 is turned off and Q3 is turned on, the interface module discharges to L1, and the inductor current decreases. Q4 is turned on, the first inductor L1 is charged through the interface module, C3 releases energy to R1, and after Q4 is turned off, the inductor and the power supply jointly supply power to R1. In the same cycle, the output voltage is the sum of the voltage of the interface module and the inductor voltage for a part of the time, and the output voltage is maintained by the capacitor voltage for another part of the time, and the average output voltage is greater than the voltage of the interface module to achieve the purpose of boosting. In addition, the boost control system includes that when not working, Q3 and Q4 are both turned off.

[0288] Among them, the duty cycle of PWM3 and PWM4 is Figure 2A to Figure 2D and Figure 6 The function of adjusting PWM1 is the same as that of controlling the voltage boost at the first end of R1.

[0289] In the second embodiment, the control module adjusts PWM5 in a manner as shown in FIG. Figure 2A to Figure 2D and Figure 6 The process of adjusting PWM2 in is not described in detail.

[0290] Based on the above Figure 6 The circuit structure of the charging system in Fig. 9 illustrate Figure 6 The temperature control method executed by the control module.

[0291] Fig. 9 is a flow chart of a temperature control method disclosed in an embodiment of the present application. The temperature control method can be Figure 6 The electronic device may include Figure 6 In any module of the present invention, the temperature control method may include but is not limited to the following steps:

[0292] S901: The electronic device obtains a battery temperature when connected to an external power source.

[0293] S902: The electronic device determines whether the battery temperature is less than a first temperature threshold. If the battery temperature is less than (less than or equal to) the first temperature threshold, S904 is executed; if the battery temperature is greater than or equal to (greater than) the first temperature threshold, S903 is executed.

[0294] S903: The electronic device charges the battery normally.

[0295] S904: The electronic device starts the heating film resistor to start working.

[0296] Among them, the third PWM is Figure 8 PWM3 in the fourth PWM is Figure 8 The process of determining the duty ratio of PWM1 and PWM2 and starting heating can refer to the relevant content of S703 and will not be described in detail.

[0297] When the duty cycle of the fourth PWM is D4, D4=(Vout-Vin) / Vout, and the duty cycle of the third PWM is D3=1-D4=Vin / Vout. Wherein, Vin is the input voltage of the boost control system, that is, the output voltage of the interface module; Vout is the output voltage of the boost control system, that is, the voltage at the first end of R1. When the input voltage Vin and the output voltage Vout of the boost control system are determined, the corresponding duty cycle of the third PWM and the duty cycle of the fourth PWM can be determined. The input voltage Vin and the output voltage Vout of the boost control system need to be determined based on the specific circuit and environment, which is not limited in this application.

[0298] For example, when the output voltage is 5V, in order to meet the power of R1, the output voltage is 7.5V, D4=(7.5-5) / 7.5=3.333%. D3=1-50%=6.667%.

[0299] It should be noted that in the boost control system, there is a dead time, that is, Q4 and Q3 cannot be turned on at the same time to ensure circuit safety.

[0300] In addition, the fifth PWM duty cycle can refer to Figure 5 The relevant description of the first duty cycle of the second PWM is omitted here.

[0301] S905: The electronic device obtains the voltage of the heating film resistor and the current flowing through the heating film resistor to determine the heating power of the heating film resistor.

[0302] The electronic device can read the voltage value V1 of the second ADC, the voltage value V2 of the first ADC, and the temperature value of the battery temperature sensor (battery temperature T1) through the control module. After obtaining the voltage value V2 of the first ADC, the current I flowing through the heating film resistor can be calculated as V2 / R2 through the current detection resistor R2.

[0303] S906: Is the power of the heating film resistance of the electronic device greater than (greater than or equal to) the preset power? If the power of the heating film resistance is greater than (greater than or equal to) the preset power, execute S908; if the power of the heating film resistance is less than or equal to (less than) the preset power, execute S907.

[0304] Among them, S901~ S906 can refer to Figure 3The relevant descriptions of S301~S306 are not repeated here.

[0305] S907: The electronic device adjusts the duty cycle of PWM3 and the duty cycle of PWM4. After executing S907, the process continues to execute S905.

[0306] The electronic device may increase the output voltage of the required boost control system and recalculate D3 and D4 according to the process of S903 , thereby adjusting D3 and D4 .

[0307] Specifically, the electronic device can increase the duty cycle D4 of Q4, increase the voltage, and increase the power; and reduce the duty cycle D4 of Q4, reduce the voltage, and reduce the power.

[0308] For example, when D4 = (Vout-Vin) / Vout = (8-5) / 8 = 37.5% and D3 = Vin / Vout = 5 / 8 = 62.5%, the control module of the electronic device needs to adjust Vout to 10V to increase power, then D4 = (Vout-Vin) / Vout = (10-5) / 10 = 50%, D3 = Vin / Vout = 50%, that is, D4 is increased to 50%.

[0309] The electronic device can determine that the battery temperature is not high enough, increase the duty cycle D1 of PWM1, and increase the voltage of the heating film resistor, so that the battery is heated as quickly as possible and the heating time is shortened.

[0310] During the processing of S905 to S907, if the preset power does not meet the standard, the electronic device will continue to loop through steps S905 to S907 until the power is greater than the preset power, then exit the loop and execute S908.

[0311] S908: The electronic device determines whether the battery temperature is greater than (greater than or equal to) a first temperature threshold. If the battery temperature is greater than (greater than or equal to) the first temperature threshold, S910 is executed. If the battery temperature is less than or equal to (less than) the first temperature threshold, S909 is executed.

[0312] S909: The electronic device increases the duty cycle of PWM5.

[0313] S910: The electronic device starts charging the battery.

[0314] S911: The electronic device determines whether the battery temperature is greater than a second temperature threshold. If the battery temperature is greater than (greater than or equal to) the second temperature threshold, S912 is executed; if the battery temperature is less than or equal to (less than) the second temperature threshold, S913 is executed.

[0315] S912: The electronic device controls the heating film resistor to stop working.

[0316] S913: The electronic device determines whether the battery temperature drops. If the battery temperature drops, the electronic device executes S915. If the battery temperature does not drop, the electronic device executes S914.

[0317] S914: The electronic device reduces the duty cycle of PWM5.

[0318] During the above-mentioned heating process, the temperature remains unchanged and is suitable for the charging environment, thereby reducing the duty cycle of PWM5 and saving power, so that the battery can be charged with greater power and faster speed.

[0319] When it is determined that the battery temperature does not decrease, the duty cycle of PWM2 is reduced to reduce the heat generation power, provide more power to the battery, and speed up the charging speed. When it is determined that the battery temperature decreases, it is necessary to further ensure that the temperature rises to a temperature environment suitable for charging, so the duty cycle of PWM2 is increased to ensure the prerequisite environment for charging.

[0320] S915: The electronic device increases the duty cycle of PWM5. After executing S915, the process continues to execute S908.

[0321] Among them, the processing process of S901~S915 can refer to the processing process of S301~S315, and will not be repeated.

[0322] In S913, when the battery temperature drops, the electronic device increases the conduction time of the heating film resistor. S915 can refer to the relevant description of S909 and will not be repeated.

[0323] Optionally, for a temperature control circuit combined with a Boost circuit, the present application may also be implemented by Figure 4 or Figure 5 The temperature control method is not limited to Figure 3 (Right now Fig. 9 The specific implementation method can be controlled by the charging method. Figure 8 and Figure 4 ,or Figure 8 and Figure 5 The implementation method is not described in detail.

[0324] In the process of executing S908 to S915, when the battery temperature is within the range of the first temperature threshold to the second temperature threshold, the electronic device can reduce the on-time when the battery temperature rises, and provide more power to the battery for charging. In order to maintain the battery temperature, when the battery temperature drops, the on-time is increased to ensure that the battery temperature is within the chargeable range. The above process can adapt to the specific charging process. After charging, the heating of the battery and the heating of the electric heating film resistor can gradually reduce the heating power, provide more power to the battery, and maintain the charging temperature, providing a good charging temperature and rate.

[0325] As used in the above embodiments, the term "when..." may be interpreted to mean "if..." or "after..." or "in response to determining..." or "in response to detecting...", depending on the context. Similarly, the phrases "upon determining..." or "if (the stated condition or event) is detected" may be interpreted to mean "if determining..." or "in response to determining..." or "upon detecting (the stated condition or event)" or "in response to detecting (the stated condition or event)", depending on the context.

[0326] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website site, computer, server or data center to another website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrated. The available medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state hard disk), etc.

[0327] Those skilled in the art can understand that to implement all or part of the processes in the above-mentioned embodiments, the processes can be completed by computer programs to instruct related hardware, and the programs can be stored in computer-readable storage media. When the programs are executed, they can include the processes of the above-mentioned method embodiments. The aforementioned storage media include: ROM or random access memory RAM, magnetic disk or optical disk and other media that can store program codes.

Claims

1. A temperature control circuit, It is characterized in that The temperature control circuit includes an interface module, a boost control system, a heating film resistor, a control module and a battery; The interface module and the battery are connected to the input end of the boost control system; the output end of the boost control system is connected to the heating film resistor; The interface module is used to connect an external power source to charge the battery and to supply power to the input end of the boost control system; the boost control system boosts the input voltage of the interface module and provides the boosted voltage to the heating film resistor; The first output end of the control module is connected to the first control end of the boost control system; the second output end of the control module is connected to the second control end of the boost control system; The control module adjusts the voltage of the heating film resistor by adjusting the first control signal of the first control end; the control module adjusts the conduction time of the heating film resistor by adjusting the second control signal of the second control end.

2. The temperature control circuit according to claim 1, It is characterized in that The boost control system includes a boost circuit and a conduction control circuit. The control end of the boost circuit is the first control end of the boost control system; the control end of the conduction control circuit is the second control end of the boost control system.

3. The temperature control circuit according to claim 2, It is characterized in that The first end of the conduction control circuit serves as the input end of the boost control system; the second end of the conduction control circuit is connected to the first end of the boost circuit, and the second end of the boost circuit serves as the output end of the boost control system and is connected to the first end of the heating film resistor; or, The first end of the boost circuit serves as the input end of the boost control system; the second end of the boost circuit is connected to the first end of the conduction control circuit, and the second end of the conduction control circuit serves as the output end of the boost control system and is connected to the first end of the heating film resistor; or, The first end of the boost circuit serves as the input end of the boost control system; the second end of the boost circuit serves as the output end of the boost control system and is connected to the first end of the heating film resistor; one end of the conduction control circuit is connected to the second end of the heating film resistor.

4. The temperature control circuit according to claim 1, It is characterized in that When the interface module is connected to an external power supply, if the battery temperature is lower than a first temperature threshold, the control module controls the boost control system to be turned on, and the heating film resistor operates normally.

5. The temperature control circuit according to claim 4, It is characterized in that When the interface module is connected to an external power source, if the battery temperature is greater than or equal to the first temperature threshold, the control module controls the battery to start charging.

6. The temperature control circuit according to claim 4, It is characterized in that After the heating film resistor starts to work, if the battery temperature is greater than a second temperature threshold, the control module controls the boost control system to be cut off, the heating film resistor stops working, and controls the battery to charge normally.

7. The temperature control circuit according to claim 6, It is characterized in that After the heating film resistor starts to work, if the battery temperature is less than or equal to the second temperature threshold, the control module controls the heating film resistor to work for a first period of time, and then re-determines whether the battery temperature is greater than the second temperature threshold.

8. The temperature control circuit according to claim 4, It is characterized in that After the heating film resistor starts to work, if the power of the heating film resistor is less than or equal to the preset power, the control module adjusts the first control signal to increase the power of the heating film resistor.

9. The temperature control circuit according to claim 8, It is characterized in that The control module adjusts the first control signal to increase the power of the heating film resistor, including: adjusting the first control signal to increase the voltage of the heating film resistor.

10. The temperature control circuit according to any one of claims 4 to 9, It is characterized in that After the heating film resistor starts to work, the control module adjusts the on-time of the heating film resistor based on the magnitude relationship between the battery temperature and the first temperature threshold.

11. The temperature control circuit according to claim 10, It is characterized in that The adjusting the on-time of the heating film resistor based on the magnitude relationship between the battery temperature and the first temperature threshold comprises: If the battery temperature is less than or equal to the first temperature threshold, the control module adjusts the second control signal to increase the on-time of the heating film resistor.

12. The temperature control circuit according to claim 10, It is characterized in that The adjusting the on-time of the heating film resistor based on the magnitude relationship between the battery temperature and the first temperature threshold comprises: If the battery temperature is less than or equal to the first temperature threshold, the control module re-judges whether the battery temperature is greater than the first temperature threshold when the temperature rise rate is greater than the first threshold rate; when the temperature rise rate is less than or equal to the first threshold rate, the control module adjusts the second control signal to increase the conduction time of the heating film resistor, and re-judges whether the battery temperature is greater than the first temperature threshold.

13. The temperature control circuit according to claim 10, It is characterized in that The control module adjusts the on-time of the heating film resistor based on the magnitude relationship between the battery temperature and the first temperature threshold, and further includes: When the battery temperature is greater than the first temperature threshold, the control module controls the battery to start charging; After the battery starts to be charged, the control module adjusts the on-time of the heating film resistor based on the relationship between the battery temperature and the second temperature threshold.

14. The temperature control circuit according to claim 13, It is characterized in that The step of adjusting the on-time of the heating film resistor based on the magnitude relationship between the battery temperature and the second temperature threshold comprises: If the battery temperature is lower than the second temperature threshold, when the battery temperature drops, the conduction time of the heating film resistor is increased, and it is re-determined whether the battery temperature is higher than the first temperature threshold; when the battery temperature does not drop, the conduction time of the heating film resistor is reduced, and it is re-determined whether the battery temperature is higher than the second temperature threshold.

15. The temperature control circuit according to claim 10, It is characterized in that After the battery starts charging, the control module obtains a first battery temperature and determines a first temperature rise rate; and adjusts the on-time of the heating film resistor based on the first temperature rise rate and the upper and lower temperature rates of a first temperature rate range.

16. The temperature control circuit according to claim 15, It is characterized in that The control module adjusts the on-time of the heating film resistor based on the relationship between the first temperature increase rate and the upper limit temperature rate and the lower limit temperature rate of the first temperature rate range, including: When the first temperature increase rate is greater than the upper temperature limit rate, the control module reduces the on-time of the heating film resistor; when the first temperature increase rate is less than the lower temperature limit rate, the control module increases the on-time of the heating film resistor; When the first temperature increase rate is between the lower temperature rate and the lower temperature rate, if the battery temperature is less than a second temperature threshold, the control module re-executes the process of obtaining the first battery temperature and determining the first temperature increase rate.

17. The temperature control circuit according to claim 16, It is characterized in that After reducing the on-time of the heater film resistor or increasing the on-time of the heater film resistor, the control device reacquires the first battery temperature and determines a first temperature increase rate.

18. The temperature control circuit according to claim 5 or 6, It is characterized in that During normal charging of the battery, the control module continues to obtain the battery temperature and determines whether the battery temperature is less than the first temperature threshold; when the battery temperature is less than the first temperature threshold, the boost control system is controlled to be turned on and the heating film resistor starts working; when the battery temperature is greater than the first temperature threshold, the battery maintains normal charging.

19. The temperature control circuit according to any one of claims 4 to 9, It is characterized in that When a first condition is met, the control module controls the boost control system to be cut off and the heating film resistor stops working; the first condition includes any one of the interface module disconnecting the external power supply and the battery charging being completed.

20. The temperature control circuit according to any one of claims 1 to 9, It is characterized in that The boost control system includes a first diode D1, a second diode D2, a first capacitor C1, a second capacitor C2, and a first switch tube Q1, including: The anode of D1 is connected to the first end of the interface module as the input end of the boost control system; the cathode of D1 is connected to the anode of D2 and the first end of C1; the cathode of D2 is connected to the first end of C2 and the first end of the heating film resistor; the second end of the heating film resistor is connected to the drain of Q1, and the source of Q1 and the second end of C2 are grounded; the second end of C1 is used as the first control end of the boost control system; the gate of the first switch tube Q1 is used as the second control end of the boost control system.

21. The temperature control circuit according to claim 20, It is characterized in that The control module adjusts the voltage of the heating film resistor by adjusting the first control signal of the first control terminal, including: The control module increases the voltage of the first control signal, and the voltage at the first end of the heating film resistor increases; the control module decreases the voltage of the first control signal, and the voltage at the first end of the heating film resistor decreases; The control module adjusts the on-time of the heating film resistor by adjusting the second control signal of the second control terminal, including: The control module increases the duty cycle of the second control signal, and the conduction time of the heating film resistor increases; the control module decreases the duty cycle of the second control signal, and the conduction time of the heating film resistor decreases.

22. The temperature control circuit according to claim 21, It is characterized in that The boost control system further includes a voltage detection module, a current detection module, a current detection resistor R3 and a fifth switch tube Q5; The source of Q5 is grounded, comprising: the source of Q5 is grounded through R3; The first end of R3 is grounded, and the second end of R3 is connected to the source of Q5 and the current detection module; the first end of the heating film resistor is connected to the voltage detection module; the control module obtains the voltage of the heating film resistor through the voltage detection module, and the control module obtains the current of the heating film resistor through the current detection module.

23. The temperature control circuit according to any one of claims 1 to 9, It is characterized in that The boost control system includes a first inductor L1, a third switch tube Q3, a fourth switch tube Q4, a fifth switch tube Q5, and an output filter capacitor C3, including: The first end of L1 is connected to the first end of the interface module as the input end of the boost control system, and the second end of L1 is connected to the drain of Q3 and the drain of Q4; the source of Q3 is connected to the first end of C3 and one end of the heating film resistor; the source of Q4, the second end of C3 and the source of Q5 are all grounded; the second end of the heating film resistor is connected to the drain of Q5; the gate of Q3 and the gate of Q4 serve as the first control end of the boost control system, and the gate of Q5 serves as the second control end of the boost control system.

24. The temperature control circuit according to any one of claims 1 to 9, It is characterized in that The temperature control circuit is applied to an electronic device, and the electronic device includes a middle frame and / or a back cover; The heating film resistor is located between the middle frame and the battery; or, the heating film resistor is located between the back cover and the battery.

25. An electronic device, It is characterized in that The electronic device comprises a temperature control circuit as described in any one of claims 1-24.

26. A temperature control method, It is characterized in that The method is applied to an electronic device, and the method comprises: The electronic device comprises an interface module, a boost control system, a heating film resistor and a battery; the interface module and the battery are connected to the input end of the boost control system; the output end of the boost control system is connected to the heating film resistor; the interface module is used to connect an external power supply to charge the battery and to supply power to the input end of the boost control system; the boost control system boosts the input voltage of the interface module and provides the boosted voltage to the heating film resistor; The electronic device adjusts the first control signal of the first control end of the boost control system to adjust the voltage of the heating film resistor; the electronic device adjusts the second control signal of the second control end of the boost control system to adjust the conduction time of the heating film resistor.

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