CN106953389B - Electronic equipment with charging temperature protection function and temperature detection method thereof - Google Patents
Electronic equipment with charging temperature protection function and temperature detection method thereof Download PDFInfo
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- CN106953389B CN106953389B CN201710303632.9A CN201710303632A CN106953389B CN 106953389 B CN106953389 B CN 106953389B CN 201710303632 A CN201710303632 A CN 201710303632A CN 106953389 B CN106953389 B CN 106953389B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
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Abstract
The invention relates to the technical field of charging protection, and discloses electronic equipment with charging temperature protection and a temperature detection method thereof. It includes: the charging temperature protection unit, the temperature sensing unit and the processing unit; the temperature sensing unit is used for detecting the battery temperature of the electronic equipment, and a first voltage input end of the temperature sensing unit is connected with a voltage output end of the charging temperature protection unit; a second voltage input end of the temperature sensing unit is connected to a system voltage output end of the electronic equipment; when the charging temperature protection unit outputs the working voltage, the charging temperature protection unit supplies power to the temperature sensing unit; when the charging temperature protection unit does not output the working voltage, a system voltage output end of the electronic equipment supplies power to the temperature sensing unit; the voltage output end of the temperature sensing unit is respectively connected with the processing unit and the charging temperature protection unit. Therefore, the device can be saved, the selection area of the charging temperature protection chip can be enlarged, and the cost can be reduced.
Description
Technical Field
The invention relates to the technical field of charging protection, in particular to electronic equipment with charging temperature protection and a temperature detection method thereof.
Background
In charge protection of electronic devices, JEITA (Japan Electronics and information technology Industries, Japan electronic information technology industry association) specifies that a full charge Voltage (Float Voltage) and a charge Current (Charging Current) are configured according to a battery temperature, and that the Float Vlotage and the Charging Current of the battery cannot exceed a limit value allowed by the battery when the battery is in different temperature ranges, thereby protecting the battery. Therefore, in realizing the JEITA charge protection, it is necessary to detect the temperature of the battery.
The inventors of the present invention found that: the existing solution with charging temperature protection is implemented by using a charging chip (Charger IC) integrating JEITA protection function and battery temperature detection function, such as charging chip BQ25896 of TI, high-pass PMI8952, etc., and there are few alternatives. However, most of the current electronic devices (for example, an intelligent terminal, a tablet, etc. can detect the battery temperature through a CPU (central processing Unit)/PMU (Power Management Unit)) have a battery temperature detection capability, and therefore, the charging IC having the temperature detection function is also wasted in design when applied to the electronic device having the temperature detection function.
Disclosure of Invention
The invention aims to provide electronic equipment with charging temperature protection and a temperature detection method thereof, wherein the charging temperature protection and the system temperature detection are realized by sharing a set of temperature sensing unit by a charging temperature protection chip and the electronic equipment, so that components can be saved, the selection area of the charging temperature protection chip can be expanded, and the cost can be reduced.
In order to solve the above technical problem, an embodiment of the present invention provides an electronic device with charging temperature protection, including: the charging temperature protection unit, the temperature sensing unit and the processing unit; the temperature sensing unit is used for detecting the battery temperature of the electronic equipment, and a first voltage input end of the temperature sensing unit is connected with a voltage output end of the charging temperature protection unit; a second voltage input end of the temperature sensing unit is connected to a system voltage output end of the electronic equipment; when the charging temperature protection unit outputs working voltage, the charging temperature protection unit supplies power to the temperature sensing unit; when the charging temperature protection unit does not output working voltage, a system voltage output end of the electronic equipment supplies power to the temperature sensing unit; and the voltage output end of the temperature sensing unit is respectively connected with the processing unit and the charging temperature protection unit.
An embodiment of the present invention further provides a temperature detection method applied to the electronic device with charging temperature protection, where the temperature detection method includes: detecting a power supply voltage of the temperature sensing unit; acquiring output voltage of the temperature sensing unit and a corresponding relation between the output voltage of the temperature sensing unit corresponding to the detected power supply voltage and battery temperature; and determining the battery temperature of the electronic equipment according to the acquired output voltage of the temperature sensing unit and the corresponding relation between the output voltage of the temperature sensing unit corresponding to the detected power supply voltage and the battery temperature.
Compared with the prior art, the embodiment of the invention has the advantages that the first voltage input end of the temperature sensing unit is connected with the voltage output end of the charging temperature protection unit (also called charging temperature protection chip), the second voltage input end of the temperature sensing unit is connected with the system voltage output end of the electronic equipment, the voltage output end of the temperature sensing unit is respectively connected with the processing unit and the charging temperature protection unit, when the charging temperature protection unit outputs working voltage, the charging temperature protection unit supplies power to the temperature sensing unit, so that the charging temperature protection unit and the processing unit can obtain the temperature of the battery through the temperature sensing unit, when the charging temperature protection unit does not output the working voltage, the system voltage output end of the electronic equipment supplies power to the temperature sensing unit, and therefore, the electronic equipment can obtain the temperature of the battery in the prior art. Therefore, the charging temperature protection unit and the processing unit can share one set of temperature sensing unit, so that components can be saved, and the charging temperature protection chip does not need to have temperature detection capability, so that the selection surface can be expanded during purchasing, and the cost is reduced.
In addition, the electronic equipment further comprises a detection unit and a storage unit; the processing unit is respectively connected with the detection unit and the storage unit; the detection unit is used for providing power supply information of the temperature sensing unit for the processing unit; the storage unit is used for storing a first voltage temperature corresponding relation and a second voltage temperature corresponding relation; the processing unit is used for determining the battery temperature according to the power supply information and the first voltage-temperature corresponding relation and the second voltage-temperature corresponding relation; the first voltage-temperature corresponding relation is the corresponding relation between the voltage output by the temperature sensing unit and the temperature of the battery when the charging temperature protection unit supplies power, and the second voltage-temperature corresponding relation is the corresponding relation between the voltage output by the temperature sensing unit and the temperature of the battery when the system voltage output end supplies power. By the mode, the processing unit can determine the battery temperature according to the first voltage-temperature corresponding relation when the charging temperature protection unit supplies power, and can determine the battery temperature according to the second voltage-temperature corresponding relation when the system voltage of the electronic equipment supplies power, so that the accuracy of the battery temperature can be guaranteed.
In addition, the detection unit includes: a fifth resistor and a sixth resistor; a first end of the fifth resistor is connected to a voltage output end of the charging temperature protection unit, a second end of the fifth resistor is connected to a first end of the sixth resistor, and a second end of the sixth resistor is grounded; and the second end of the fifth resistor is connected to the processing unit.
In addition, the temperature sensing unit includes: the circuit comprises a first diode, a second diode, a first resistor and a second resistor; wherein the second resistor is a temperature sensitive resistor; one end of the first diode is connected to the voltage output end of the charging temperature protection unit, and the other end of the first diode is connected to the first end of the first resistor; one end of the second diode is connected to a system voltage output end of the electronic equipment, and the other end of the second diode is connected to the first end of the first resistor; the second end of the first resistor is connected to the first end of the second resistor, the second end of the second resistor is grounded, and the first end of the second resistor is used as the voltage output end of the temperature sensing unit.
In addition, the electronic device further includes: a switch unit; the output end of the switch unit is connected to the processing unit, the processing unit is connected to the control end of the switch unit, and the temperature sensing unit is connected to the processing unit through the switch unit; the temperature sensing unit further includes: a third resistor and a fourth resistor; the first end of the third resistor is connected to the second end of the first resistor; the second end of the third resistor is connected to one end of the fourth resistor, and the other end of the fourth resistor is grounded; a first end of the second resistor is connected to a first end of the switch unit, and a second end of the third resistor is connected to a second end of the switch unit; the processing unit is further used for controlling the switch unit to switch on a second end of the switch unit and an output end of the switch unit when the charging temperature protection unit outputs working voltage; when the charging temperature protection unit does not output working voltage, controlling the switch unit to connect the first end of the switch unit with the output end of the switch unit; the storage unit also stores a third voltage-temperature corresponding relation; the third voltage-temperature corresponding relation is a corresponding relation between the output voltage of the second end of the third resistor and the battery temperature; the processing unit is further configured to determine the battery temperature according to the second voltage-temperature correspondence, the third voltage-temperature correspondence, and the power supply information. Through the mode, when the charging temperature protection unit supplies power, the voltage on the temperature sensing unit is divided and then output to the processing unit, so that the output voltage of the temperature sensing unit meets the voltage receiving range of the processing unit, and the condition that the output voltage of the temperature sensor exceeds the receiving range of the processing unit due to the fact that the voltage is higher when the charging temperature protection unit supplies power is avoided.
In addition, the switch unit is a single-pole double-throw switch.
In addition, the second resistor is a negative temperature coefficient resistor.
In addition, the charging temperature protection unit is a charging temperature protection unit supporting JEITA standard.
In addition, when the temperature-sensitive resistor of the temperature sensing unit is provided with a voltage division circuit and the electronic equipment is in a charging state, the output voltage of the voltage division circuit is provided to the processing unit; the acquiring of the output voltage of the temperature sensing unit and the corresponding relation between the output voltage of the temperature sensing unit corresponding to the detected power supply voltage and the battery temperature specifically includes: if the electronic equipment is in a charging state, acquiring the output voltage of a voltage division circuit of a temperature-sensitive resistor of the temperature sensing unit and the corresponding relation between the output voltage of the voltage division circuit and the temperature of the battery; the determining the battery temperature of the electronic device according to the obtained output voltage of the temperature sensing unit and the corresponding relationship between the output voltage of the temperature sensing unit corresponding to the detected power supply voltage and the battery temperature specifically includes: and determining the battery temperature according to the acquired output voltage of the voltage division circuit of the temperature-sensitive resistor of the temperature sensing unit and the corresponding relation between the output voltage of the voltage division circuit and the battery temperature.
Drawings
Fig. 1 is a schematic structural diagram of an electronic device with charging temperature protection according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of an electronic device with charging temperature protection according to a second embodiment of the present invention;
FIG. 3 is a flowchart of a temperature detection method according to a third embodiment of the present invention;
fig. 4 is a flowchart of a temperature detection method according to a fourth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.
A first embodiment of the present invention relates to an electronic device with charging temperature protection. The electronic device is equipped with a rechargeable battery, such as a lithium battery. Examples of the electronic devices include smart phones, tablet computers, and personal digital assistants. The present embodiment is not particularly limited to the electronic device and the type of battery therein.
As shown in fig. 1, the electronic device with charging temperature protection according to the present embodiment includes: a charging temperature protection unit 1, a temperature sensing unit 2, and a processing unit 3. The temperature sensing unit 2 is used for detecting the battery temperature of the electronic device, a first voltage input end of the temperature sensing unit 2 is connected to a voltage output end of the charging temperature protection unit 1, and a second voltage input end of the temperature sensing unit 2 is connected to a system voltage output end of the electronic device. When the charging temperature protection unit 1 outputs the working voltage, the charging temperature protection unit 1 supplies power to the temperature sensing unit 2, and when the charging temperature protection unit 1 does not output the working voltage, the system voltage output end of the electronic device supplies power to the temperature sensing unit 2. The voltage output end of the temperature sensing unit 2 is respectively connected to the processing unit 3 and the charging temperature protection unit 2.
In the present embodiment, the charging temperature protection unit 1 is used for protecting the charging temperature of the battery when the electronic device is charged, for example, the charging temperature protection unit may be a charging temperature protection unit supporting the JEITA standard, and the charging temperature protection unit is not particularly limited in the present embodiment. The temperature sensing unit 2 of the present embodiment has two power supply modes, and when the electronic device is not being charged, the temperature sensing unit 2 is supplied with power from the system voltage output terminal of the electronic device, and when the electronic device is being charged, the temperature sensing unit 2 is supplied with power from the charging temperature protection unit 1. In this way, in the power-on state, the temperature sensing unit 2 can always provide the battery temperature information of the electronic device to the processing unit, and meanwhile, the charging temperature protection unit 1 can also obtain the battery temperature information through the temperature sensing unit 2 during charging. The processing unit may be a central processing unit of an electronic device or a PMU, and the processing unit in this embodiment is not particularly limited. Therefore, the charging temperature protection unit and the processing unit of the present embodiment can share the temperature sensing unit, thereby saving components, and since the charging temperature protection unit (i.e., the charging temperature protection chip) of the present embodiment only needs to support the charging temperature protection function, and does not need to have a temperature detection capability, it is possible to expand the selection range when the charging temperature protection chip is actually purchased.
In practical applications, since the output voltage of the voltage output terminal of the charging temperature protection unit (i.e. Vchg _ LDO in fig. 1) is generally 5V (volt), and the output voltage of the system voltage output terminal of the electronic device is generally 1.8V, the difference between the two voltages is large, so that the difference between the output voltages provided by the temperature sensing unit 2 to the processing unit 3 (the processing unit 3 obtains the battery temperature by using the output voltage) of the temperature sensing unit 2 is large under different power supply voltages. Based on this, the electronic device of the present embodiment further includes: a detection unit 4 and a storage unit. The storage unit may be an independent circuit module, or may be a storage module built in the processing unit 3, and the implementation of the storage unit is not particularly limited in this embodiment. When the storage unit is an independent functional module, the processing unit 3 is further connected to the detection unit 4 and the storage unit, respectively. The detection unit 4 is used for providing power supply information of the temperature sensing unit 2 for the processing unit 3, and the storage unit is used for storing the first voltage temperature corresponding relation and the second voltage temperature corresponding relation. The first voltage-temperature correspondence relationship is a correspondence relationship between voltage output by the temperature sensing unit 2 and battery temperature when the charging temperature protection unit 1 supplies power, and the second voltage-temperature correspondence relationship is a correspondence relationship between voltage output by the temperature sensing unit 2 and battery temperature when the system voltage output end supplies power. The processing unit 3 is configured to determine the battery temperature according to the power supply information provided by the detecting unit 4 and the first voltage-temperature correspondence and the second voltage-temperature correspondence. Namely, when the charging temperature protection unit 1 supplies power, the processing unit 3 determines the battery temperature according to the first voltage-temperature correspondence, and when the system voltage output end of the electronic device supplies power, the processing unit 3 determines the battery temperature according to the second voltage-temperature correspondence. Therefore, the processing unit 3 can be ensured to accurately obtain the battery temperature when the temperature sensing units adopt different power supply voltages.
Specifically, the temperature sensing unit 2 of the present embodiment includes: the circuit comprises a first diode D1, a second diode D2, a first resistor R1 and a second resistor R2. The second resistor R2 is a temperature sensitive resistor, and the second resistor R2 is, for example, a negative temperature coefficient resistor, that is, as the battery temperature increases, the resistance of the second resistor R2 decreases, and as the battery temperature decreases, the resistance of the second resistor R2 increases. One end of the first diode D1 is connected to the voltage output end (i.e., Vchg _ LDO) of the charging temperature protection unit 1, the other end of the first diode D1 is connected to the first end of the first resistor R1, one end of the second diode D2 is connected to the system voltage output end (i.e., V2) of the electronic device, the other end of the second diode D2 is connected to the first end of the first resistor R1, the second end of the first resistor R1 is connected to the first end of the second resistor R2, the second end of the second resistor R2 is grounded, and the first end of the second resistor R2 serves as the voltage output end of the temperature sensing unit, i.e., the first end of the second resistor R2 is connected to the charging temperature protection unit 1 and the processing unit 3. The first resistor R1, the second resistor R2 and the first diode D1 form a first voltage divider circuit, and the first resistor R1, the second resistor R2 and the second diode D2 form a second voltage divider circuit. When the electronic device is not charged (i.e. when the voltage output terminal of the charging temperature protection unit does not output), the second diode D2 is turned on, the first diode D1 is turned off, and the second voltage division circuit operates, at this time, the temperature sensing unit 2 detects the temperature information of the battery through the voltage provided by the system voltage output terminal of the electronic device, and when the electronic device is charged (at this time, the voltage output terminal of the charging temperature protection unit outputs the voltage), because the voltage (e.g. 5V) output by the voltage output terminal of the charging temperature protection unit is higher than the voltage (e.g. 1.8V) output by the system voltage output terminal of the electronic device, at this time, the first diode D1 is turned on, the second diode D2 is turned off, and the temperature sensing unit 2 detects the temperature information of the battery through the voltage provided.
The detection unit 4 of the present embodiment includes: a fifth resistor R5 and a sixth resistor R6. A first end of the fifth resistor R5 is connected to the voltage output end of the charging temperature protection unit 1, a second end of the fifth resistor R5 is connected to a first end of the sixth resistor R6, a second end of the sixth resistor R6 is grounded, and a second end of the fifth resistor R5 is connected to the processing unit 3. The fifth resistor R5 and the sixth resistor R6 form a third voltage dividing circuit, when there is no output voltage at the voltage output terminal of the charging temperature protection unit 1, the output voltage of the third voltage dividing circuit is low, and when there is output voltage at the voltage output terminal of the charging temperature protection unit 1, the output voltage of the third voltage dividing circuit is high, so that the processing unit 3 can determine whether the electronic device is in a charging state according to the level of the output voltage of the third voltage dividing circuit, and whether the electronic device is in the charging state also determines the specific power supply voltage of the temperature sensing unit, so the processing unit 3 can determine the temperature of the battery according to the power supply information provided by the detection unit 4 and the stored first voltage-temperature corresponding relationship and the stored second voltage-temperature corresponding relationship.
Compared with the prior art, the charging temperature protection unit in the electronic equipment with charging temperature protection, such as the charging temperature protection unit supporting the JEITA standard and the processing unit of the electronic equipment, share one set of temperature sensing unit, so that components can be saved. And the electronic equipment detects the power supply information of the temperature sensing unit through the detection unit, so that the processing unit can accurately determine the temperature of the battery according to the power supply information and the corresponding relation between the power supply voltage and the temperature.
A second embodiment of the present invention relates to an electronic device with charging temperature protection. The second embodiment is an improvement on the first embodiment, and the main improvements are as follows: in the second embodiment, a fourth voltage dividing circuit is added in the temperature sensing unit, and when the charging temperature protection unit supplies power, the added fourth voltage dividing circuit provides temperature information to the processing unit, so that the situation that the power supply voltage of the charging temperature protection unit is too high and exceeds the acceptance range of the processing unit can be avoided.
As shown in fig. 2, the electronic device with charging temperature protection according to the present embodiment includes: the charging temperature protection device comprises a charging temperature protection unit 1, a temperature sensing unit 2, a processing unit 3, a detection unit 4, a storage unit and a switch unit 5. Wherein, the output terminal (i.e. a0 in fig. 2) of the switch unit 5 is connected to the processing unit 3, the processing unit 3 is connected to the control terminal of the switch unit 5, and the detection unit 4 is connected to the processing unit 3, i.e. the second terminal of the fifth resistor R5 is connected to the processing unit 3. The temperature sensing unit 2 is connected to the processing unit 3 through a switching unit 5. The switch unit 5 may be a single-pole double-throw switch, and the switch unit is not particularly limited in this embodiment.
Specifically, the temperature sensing unit includes: the circuit comprises a first diode D1, a second diode D2, a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4. The connection manner of the first diode D1, the second diode D2, the first resistor R1 and the second resistor R2 is the same as that of the first embodiment, and is not repeated herein. The first end of the third resistor R3 is connected to the second end of the first resistor R1, the second end of the third resistor R3 is connected to one end of the fourth resistor R4, and the other end of the fourth resistor R4 is grounded. A first terminal of the second resistor R2 is connected to a first terminal (i.e., a1) of the switch unit 5, and a second terminal of the third resistor R3 is connected to a second terminal (i.e., a2) of the switch unit 5. The processing unit 3 is further configured to control the switch unit 5 to switch on the second terminal of the switch unit 5 and the output terminal of the switch unit 5 when the charging temperature protection unit 1 outputs the operating voltage, and control the switch unit 5 to switch on the first terminal of the switch unit 5 and the output terminal of the switch unit 5 when the charging temperature protection unit 1 does not output the operating voltage. The storage unit further stores a third voltage-temperature correspondence relationship, wherein the third voltage-temperature correspondence relationship is a correspondence relationship between the output voltage of the second end of the third resistor R3 and the battery temperature. The processing unit is further used for determining the battery temperature according to the second voltage-temperature corresponding relation, the third voltage-temperature corresponding relation and the power supply information.
In this embodiment, the impedance of the third resistor R3 and the fourth resistor R4 may be selected in consideration of the fact that the sum of the impedances of the third resistor R3 and the fourth resistor R4 is large, and the impedance of the third resistor is larger than the impedance of the fourth resistor R4, so that the voltage falling on the fourth resistor R4 may be made small and fall within the acceptable range of the processing unit 3, and the temperature detection accuracy may be prevented from being lowered due to the too small voltage falling on the second resistor R2.
When the electronic device is charged, the voltage output end of the charging temperature protection unit outputs a voltage, the voltage across the fifth resistor R5 of the detection unit 4 is high, at this time, the processing unit 3 may determine that the electronic device is in a charging state according to the high voltage across the fifth resistor R5, at this time, the processing unit 3 may control the control end of the switching unit 5 to switch on the second end (a2) of the switching unit 5 with the output end (a0), so that the processing unit 3 obtains a voltage signal across the second end of the third resistor R3, and due to the voltage dividing effect of the third resistor R3 and the fourth resistor R4 on the second resistor R2, the voltage signal across the fourth resistor R4 (i.e., temperature information) may fall within an acceptable range of the processing unit 3. When the electronic device is not charged, the voltage output end of the charging temperature protection unit 1 has no output voltage, the voltage across the fifth resistor R5 of the detection unit 4 is low, at this time, the processing unit 3 may determine that the electronic device is in an uncharged state according to the low voltage of the fifth resistor R5, at this time, the processing unit 3 controls the switch unit 5 to switch on the first end (a1) of the switch unit 5 with the output end (a0), the processing unit 3 obtains the voltage signal across the second end of the first resistor R1, and since the first resistor R1 and the second resistor R2 are powered by the system voltage output end of the electronic device, the power supply voltage is small, and therefore, the acceptance range of the processing unit 3 is not exceeded.
Therefore, in the present embodiment, the voltage dividing circuit formed by the third resistor and the fourth resistor is added to the temperature sensing unit to divide the power supply voltage provided by the charging temperature protection unit, and the divided voltage signal (i.e., the temperature information) is provided to the processing unit 3 through the switch unit under the control of the processing unit, so that it is possible to avoid that the output voltage of the temperature sensing unit exceeds the acceptable range of the processing unit due to the excessively high power supply voltage of the charging temperature protection unit.
It should be noted that each module referred to in this embodiment is a logical module, and in practical applications, one logical unit may be one physical unit, may be a part of one physical unit, and may be implemented by a combination of multiple physical units. In addition, in order to highlight the innovative part of the present invention, elements that are not so closely related to solving the technical problems proposed by the present invention are not introduced in the present embodiment, but this does not indicate that other elements are not present in the present embodiment.
A third embodiment of the present invention relates to a temperature detection method applied to an electronic device with charging temperature protection as described in the first embodiment. As shown in fig. 3, the temperature detection method of the present embodiment includes steps 301 to 303.
Step 301: the supply voltage of the temperature sensing unit is detected.
Wherein, the electronic device can determine the power supply voltage of the temperature sensing unit by detecting whether the charger is inserted. The supply voltage of the temperature sensing unit is, for example, 5V when a charger is inserted, and 1.8V when no charger is inserted.
Step 302: and acquiring the output voltage of the temperature sensing unit and the corresponding relation between the output voltage of the temperature sensing unit corresponding to the detected power supply voltage and the temperature of the battery.
The electronic device is pre-stored with a first voltage-temperature corresponding relation and a second voltage-temperature corresponding relation, the first voltage-temperature corresponding relation is a corresponding relation between voltage output by the temperature sensing unit and battery temperature when the charging temperature protection unit supplies power, and the second voltage-temperature corresponding relation is a corresponding relation between voltage output by the temperature sensing unit and battery temperature when the system voltage output end supplies power.
Step 303: and determining the battery temperature of the electronic equipment according to the acquired output voltage of the temperature sensing unit and the corresponding relation between the output voltage of the temperature sensing unit corresponding to the detected power supply voltage and the battery temperature.
Specifically, when the electronic device is in a charging state, the battery temperature is determined according to the first voltage-temperature correspondence, and when the electronic device is not in the charging state, the battery temperature is determined according to the second voltage-temperature correspondence.
Compared with the prior art, when the charging temperature protection unit and the processing unit share one set of temperature sensing unit, the electronic device can determine the battery temperature of the electronic device according to the power supply voltage in the charging state and the non-charging state and the corresponding relation between the power supply voltage and the battery temperature.
A fourth embodiment of the present invention relates to a temperature detection method. The fourth embodiment is an improvement on the third embodiment, and the main improvements are as follows: in the fourth embodiment, when the temperature-sensitive resistor of the temperature sensing unit of the electronic device has a voltage dividing circuit and the electronic device is in a charging state, the processing unit supplies the output voltage of the voltage dividing circuit to the processing unit. Therefore, the voltage signal provided by the temperature sensing unit to the processing unit can be ensured to be within an acceptable range of the processing unit in the charging state.
As shown in fig. 4, the temperature detection method of the present embodiment includes steps 401 to 403.
Step 401: the supply voltage of the temperature sensing unit is detected.
Wherein, the electronic device can determine the power supply voltage of the temperature sensing unit by detecting whether the charger is inserted. The supply voltage of the temperature sensing unit is, for example, 5V when a charger is inserted, and 1.8V when no charger is inserted.
Step 402: if the electronic equipment is in a charging state, acquiring the output voltage of a voltage division circuit of a temperature-sensitive resistor of the temperature sensing unit and the corresponding relation between the output voltage of the voltage division circuit and the temperature of the battery.
The temperature-sensitive resistor of the temperature sensing unit is provided with a voltage division circuit, and the voltage division circuit can reduce the output voltage of the temperature sensing unit to be within the receiving range of the processing unit, so that the processing unit acquires the corresponding relation between the output voltage of the voltage division circuit and the temperature of the battery when the electronic equipment is in a charging state.
Step 403: and determining the battery temperature according to the acquired output voltage of the voltage division circuit of the temperature-sensitive resistor of the temperature sensing unit and the corresponding relation between the output voltage of the voltage division circuit and the battery temperature.
In step 403, during charging, the electronic device determines the battery temperature according to the acquired output voltage of the voltage divider circuit of the temperature sensitive resistor of the temperature sensing unit and the corresponding relationship between the output voltage of the voltage divider circuit and the battery temperature.
In the temperature detection method of the embodiment, the corresponding relationship between the output voltage of the voltage division circuit and the battery temperature is pre-stored, so that the battery temperature of the electronic equipment can be determined according to the corresponding relationship when the electronic equipment is in a charging state.
The steps of the above methods are divided for clarity, and the implementation may be combined into one step or split some steps, and the steps are divided into multiple steps, so long as the steps contain the same logical relationship, which is within the protection scope of the present patent; it is within the scope of the patent to add insignificant modifications to the algorithms or processes or to introduce insignificant design changes to the core design without changing the algorithms or processes.
Those skilled in the art can understand that all or part of the steps in the method of the foregoing embodiments may be implemented by a program to instruct related hardware, where the program is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, etc.) or a processor (processor) to execute all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (8)
1. An electronic device with charging temperature protection, comprising: the charging temperature protection unit, the temperature sensing unit and the processing unit;
the temperature sensing unit is used for detecting the battery temperature of the electronic equipment, and a first voltage input end of the temperature sensing unit is connected with a voltage output end of the charging temperature protection unit; a second voltage input end of the temperature sensing unit is connected to a system voltage output end of the electronic equipment; when the charging temperature protection unit outputs working voltage, the charging temperature protection unit supplies power to the temperature sensing unit; when the charging temperature protection unit does not output working voltage, a system voltage output end of the electronic equipment supplies power to the temperature sensing unit;
the voltage output end of the temperature sensing unit is respectively connected with the processing unit and the charging temperature protection unit;
the electronic equipment further comprises a detection unit and a storage unit;
the processing unit is respectively connected with the detection unit and the storage unit;
the detection unit is used for providing power supply information of the temperature sensing unit for the processing unit;
the storage unit is used for storing a first voltage temperature corresponding relation and a second voltage temperature corresponding relation;
the processing unit is used for determining the battery temperature according to the power supply information and the first voltage-temperature corresponding relation and the second voltage-temperature corresponding relation;
the first voltage-temperature corresponding relation is the corresponding relation between the voltage output by the temperature sensing unit and the temperature of the battery when the charging temperature protection unit supplies power, and the second voltage-temperature corresponding relation is the corresponding relation between the voltage output by the temperature sensing unit and the temperature of the battery when the system voltage output end supplies power.
2. The electronic device with charging temperature protection of claim 1,
the detection unit includes: a fifth resistor and a sixth resistor;
a first end of the fifth resistor is connected to a voltage output end of the charging temperature protection unit, a second end of the fifth resistor is connected to a first end of the sixth resistor, and a second end of the sixth resistor is grounded; and the second end of the fifth resistor is connected to the processing unit.
3. The electronic device with charging temperature protection of claim 1,
the temperature sensing unit includes: the circuit comprises a first diode, a second diode, a first resistor and a second resistor; wherein the second resistor is a temperature sensitive resistor;
one end of the first diode is connected to the voltage output end of the charging temperature protection unit, and the other end of the first diode is connected to the first end of the first resistor;
one end of the second diode is connected to a system voltage output end of the electronic equipment, and the other end of the second diode is connected to the first end of the first resistor;
the second end of the first resistor is connected to the first end of the second resistor, the second end of the second resistor is grounded, and the first end of the second resistor is used as the voltage output end of the temperature sensing unit.
4. The electronic device with charging temperature protection according to claim 3,
the electronic device further includes: a switch unit; the output end of the switch unit is connected to the processing unit, the processing unit is connected to the control end of the switch unit, and the temperature sensing unit is connected to the processing unit through the switch unit;
the temperature sensing unit further includes: a third resistor and a fourth resistor;
the first end of the third resistor is connected to the second end of the first resistor; the second end of the third resistor is connected to one end of the fourth resistor, and the other end of the fourth resistor is grounded;
a first end of the second resistor is connected to a first end of the switch unit, and a second end of the third resistor is connected to a second end of the switch unit;
the processing unit is further used for controlling the switch unit to switch on a second end of the switch unit and an output end of the switch unit when the charging temperature protection unit outputs working voltage; when the charging temperature protection unit does not output working voltage, controlling the switch unit to connect the first end of the switch unit with the output end of the switch unit;
the storage unit also stores a third voltage-temperature corresponding relation; the third voltage-temperature corresponding relation is a corresponding relation between the output voltage of the second end of the third resistor and the battery temperature;
the processing unit is further configured to determine the battery temperature according to the second voltage-temperature correspondence, the third voltage-temperature correspondence, and the power supply information.
5. The electronic device with charging temperature protection according to claim 4,
the switch unit is a single-pole double-throw switch.
6. The electronic device with charging temperature protection according to any one of claims 3 to 5, wherein the second resistor is a negative temperature coefficient resistor.
7. The electronic device with charging temperature protection according to any one of claims 1 to 5, wherein the charging temperature protection unit is a charging temperature protection unit supporting JEITA standard.
8. A temperature detection method applied to the electronic device with charging temperature protection according to claim 1,
the temperature detection method comprises the following steps:
detecting a power supply voltage of the temperature sensing unit;
acquiring output voltage of the temperature sensing unit and a corresponding relation between the output voltage of the temperature sensing unit corresponding to the detected power supply voltage and battery temperature;
determining the battery temperature of the electronic equipment according to the acquired output voltage of the temperature sensing unit and the corresponding relation between the output voltage of the temperature sensing unit corresponding to the detected power supply voltage and the battery temperature;
when the temperature-sensitive resistor of the temperature sensing unit is provided with a voltage division circuit and the electronic equipment is in a charging state, the output voltage of the voltage division circuit is provided to the processing unit;
the acquiring of the output voltage of the temperature sensing unit and the corresponding relation between the output voltage of the temperature sensing unit corresponding to the detected power supply voltage and the battery temperature specifically includes:
if the electronic equipment is in a charging state, acquiring the output voltage of a voltage division circuit of a temperature-sensitive resistor of the temperature sensing unit and the corresponding relation between the output voltage of the voltage division circuit and the temperature of the battery;
the determining the battery temperature of the electronic device according to the obtained output voltage of the temperature sensing unit and the corresponding relationship between the output voltage of the temperature sensing unit corresponding to the detected power supply voltage and the battery temperature specifically includes:
and determining the battery temperature according to the acquired output voltage of the voltage division circuit of the temperature-sensitive resistor of the temperature sensing unit and the corresponding relation between the output voltage of the voltage division circuit and the battery temperature.
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| CN104377759A (en) * | 2014-10-31 | 2015-02-25 | 华为数字技术（苏州）有限公司 | Charge control circuit and voltage adjusting method |
| CN206041465U (en) * | 2016-09-12 | 2017-03-22 | 广州视源电子科技股份有限公司 | Switching power supply circuit with over-temperature protection |
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| US20140009124A1 (en) * | 2012-07-09 | 2014-01-09 | R. Brian Skinner | Partial hot plug protection circuit for super capacitor temperature sensor |
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| CN101771428A (en) * | 2010-01-19 | 2010-07-07 | 青岛海信移动通信技术股份有限公司 | Temperature detection circuit and mobile communication equipment |
| CN103171450A (en) * | 2011-12-21 | 2013-06-26 | 福特环球技术公司 | Method and system for heat management of vehicle high-voltage battery |
| CN203967779U (en) * | 2014-05-19 | 2014-11-26 | Tcl通力电子（惠州）有限公司 | Secondary battery protective circuit and electronic equipment |
| CN104377759A (en) * | 2014-10-31 | 2015-02-25 | 华为数字技术（苏州）有限公司 | Charge control circuit and voltage adjusting method |
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Address after: Building 1, 399 Keyuan Road, China (Shanghai) pilot Free Trade Zone, Pudong New Area, Shanghai, 201203 Patentee after: Huaqin Technology Co.,Ltd. Address before: Building 1, No. 399 Keyuan Road, Pudong New Area, Shanghai, 201203 Patentee before: Huaqin Technology Co.,Ltd. Address after: Building 1, No. 399 Keyuan Road, Pudong New Area, Shanghai, 201203 Patentee after: Huaqin Technology Co.,Ltd. Address before: Building 1, No. 399 Keyuan Road, Zhangjiang hi tech park, Pudong New Area, Shanghai, 201203 Patentee before: HUAQIN TELECOM TECHNOLOGY Co.,Ltd. |