Charging control method of charging control device and thermometer

Abstract

The invention discloses a charging control method of a charging control device and a thermometer, the device comprises a voltage conversion module, a charging module and a control module, the charging module comprises a first charging seat, a second charging seat, a first resistor and a second resistor; the voltage conversion module is connected with the charging module, the control module and the battery, the control module is connected with the charging module, one end of the first resistor is connected with the first charging seat and the control module, one end of the second resistor is connected with the second charging seat and the control module, and the other ends of the first resistor and the second resistor are grounded. The first charging seat and the second charging seat are connected with a charged device; the charging control method comprises the steps that the control module detects the voltage drop of the first resistor and the second resistor, determines the current flowing through the charged device according to the voltage drop of the first resistor and the second resistor, and controls the charging state of the charging module according to the current. According to the embodiment of the invention, the cost can be reduced.

Description

[0001] This application is a divisional application. The application number of the original application is 202411007368.0, and the original application date is July 25, 2024. The entire contents of the original application are incorporated into this application by reference. Technical Field

[0002] The present application relates to the technical field of electronic circuits, and in particular to a charging control method and a thermometer for a charging control device. Background Art

[0003] With the advent of the Internet of Things era, wireless devices are becoming more and more popular, such as wireless thermometers. The wireless thermometer is equipped with a charging stand, and the wireless temperature measuring device of the wireless thermometer can be placed on the charging stand for charging. The wireless thermometer can determine whether the wireless temperature measuring device is fully charged by the current flowing through the wireless temperature measuring device, but measuring the current of the wireless temperature measuring device requires a current detection chip. The current detection chip is an integrated chip, which requires a relatively high cost. Summary of the invention

[0004] The embodiment of the present application discloses a charging control method and a thermometer of a charging control device, which are used to reduce costs.

[0005] In a first aspect, an embodiment of the present application discloses a charging control method for a charging control device, which is applied to a charging control device, wherein the charging control device includes a voltage conversion module, a charging module, and a control module, wherein the charging module includes a first charging seat, a second charging seat, a first resistor, and a second resistor;

[0006] The voltage conversion module is respectively connected to the charging module, the first end of the control module and the battery, the second end, the third end, the fourth end and the fifth end of the control module are respectively connected to the charging module, one end of the first resistor is respectively connected to the first charging seat and the second end of the control module, one end of the second resistor is respectively connected to the second charging seat and the third end of the control module, the other end of the first resistor and the other end of the second resistor are respectively grounded, and the first charging seat and the second charging seat are respectively connected to the charged device; the charging control method includes:

[0007] detecting a voltage drop across the first resistor and a voltage drop across the second resistor;

[0008] determining a current flowing through the charged device according to a voltage drop of the first resistor and a voltage drop of the second resistor;

[0009] The charging state of the charging module is controlled according to the current.

[0010] In a second aspect, an embodiment of the present application discloses a thermometer, including a charging control device, the charging control device including a voltage conversion module, a charging module and a control module, the charging module including a first charging seat, a second charging seat, a first resistor and a second resistor;

[0011] The voltage conversion module is respectively connected to the charging module, the first end of the control module and the battery, the second end, the third end, the fourth end and the fifth end of the control module are respectively connected to the charging module, one end of the first resistor is respectively connected to the first charging seat and the second end of the control module, one end of the second resistor is respectively connected to the second charging seat and the third end of the control module, the other end of the first resistor and the other end of the second resistor are respectively grounded, the first charging seat and the second charging seat are respectively connected to the charged device; the charging device adopts the charging control method of the charging device as described in the first aspect to perform charging control.

[0012] In the embodiment of the present application, the charging control device includes a voltage conversion module, a charging module and a control module, and the charging module includes a first charging seat, a second charging seat, a first resistor and a second resistor; the voltage conversion module is respectively connected to the first end of the charging module and the control module and the battery, the second end, the third end, the fourth end and the fifth end of the control module are respectively connected to the charging module, one end of the first resistor is respectively connected to the first charging seat and the second end of the control module, one end of the second resistor is respectively connected to the second charging seat and the third end of the control module, the other end of the first resistor and the other end of the second resistor are respectively grounded, and the first charging seat and the second charging seat are respectively connected to the charged device; the charging control method includes: detecting the voltage drop of the first resistor and the voltage drop of the second resistor, determining the current flowing through the charged device according to the voltage drop of the first resistor and the voltage drop of the second resistor, and controlling the charging state of the charging module according to the current flowing through the charged device. It can be seen that the voltage drop on the two resistors can be measured first, and then the current flowing through the charged device can be determined according to the voltage drop on the two resistors, that is, only two resistors are needed to determine the current flowing through the charged device, and no special integrated chip is required, which can reduce the cost of the charging control device. In addition, the control module can control the charging state of the charging module according to the current flowing through the charged device, so that the charged device can be charged with a large current when a large current is required, and can be charged with a small current when a large current is not required. This can achieve charging flexibility, fast charging, and prevention of overcharging, as well as save power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0014] Figure 1 is a structural schematic diagram of a charging control device disclosed in an embodiment of the present application;

[0015] Figure 2 is a structural schematic diagram of another charging control device disclosed in an embodiment of the present application;

[0016] Figure 3 It is a structural schematic diagram of a charging module disclosed in an embodiment of the present application;

[0017] Figure 4 It is a structural schematic diagram of a voltage conversion module disclosed in an embodiment of the present application;

[0018] Figure 5 is a schematic diagram of the structure of another voltage conversion module disclosed in an embodiment of the present application;

[0019] Figure 6 is a schematic diagram of an ETA5050VOS2F chip disclosed in an embodiment of the present application;

[0020] Figure 7 is a structural schematic diagram of a control module disclosed in an embodiment of the present application;

[0021] Figure 8 is a schematic diagram of a FR8018HA chip disclosed in an embodiment of the present application;

[0022] Fig. 9 It is a structural schematic diagram of a buzzer module disclosed in an embodiment of the present application;

[0023] Fig.10 It is a structural schematic diagram of a barbecue thermometer disclosed in an embodiment of the present application;

[0024] Fig.11 It is a flow chart of a charging control method of a charging control device disclosed in an embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0026] The embodiment of the present application discloses a charging control method and a thermometer of a charging control device, which are used to reduce costs. Detailed descriptions are given below.

[0027] In order to better understand the embodiments of the present application, the relevant technologies of the embodiments of the present application are described below.

[0028] With the advent of the Internet of Things era, wireless devices are becoming more and more popular, such as wireless barbecue thermometers. The tip of the wireless probe of the wireless barbecue thermometer is inserted into the meat to measure the internal temperature, and the tail of the barbecue thermometer is exposed to the outside to measure the ambient temperature. The wireless barbecue thermometer needs to charge the wireless probe. The wireless barbecue thermometer is equipped with a charging stand, and the wireless probe can be placed on the charging stand for charging. The wireless barbecue thermometer can determine whether the wireless probe is full by monitoring the current flowing through the wireless probe, but measuring the current of the wireless probe requires a current detection chip. The current detection chip is an integrated chip, which requires a large cost.

[0029] In order to solve the above problems, the present application designs a charging control method for a charging control device, which is applied to a control module of the charging control device. The charging control device includes a voltage conversion module, a charging module and a control module. The charging module includes a first charging seat, a second charging seat, a first resistor and a second resistor. The voltage conversion module is respectively connected to the first end of the charging module and the control module and the battery. The second end, the third end, the fourth end and the fifth end of the control module are respectively connected to the charging module. One end of the first resistor is respectively connected to the first charging seat and the second end of the control module. One end of the second resistor is respectively connected to the second charging seat and the third end of the control module. The other end of the first resistor and the other end of the second resistor are respectively grounded. The first charging seat and the second charging seat are respectively connected to the charged device. The charging control method includes: detecting the voltage drop of the first resistor and the voltage drop of the second resistor, determining the current flowing through the charged device according to the voltage drop of the first resistor and the voltage drop of the second resistor, and controlling the charging state of the charging module according to the current flowing through the charged device. It can be seen that the voltage drop on the two resistors can be measured first, and then the current flowing through the charged device can be determined according to the voltage drop on the two resistors. That is, only two resistors are needed to determine the current flowing through the charged device, and no special integrated chip is required, which can reduce the cost of the charging control device.

[0030] The charging control method of the charging control device provided in the embodiment of the present application is applied to the control module of the charging control device. The charging control method of the charging control device provided in the embodiment of the present application will be described in detail below in combination with the specific structure of the charging control device.

[0031] See also Fig.11 , Fig.11 1 is a flow chart of a charging control method of a charging control device disclosed in an embodiment of the present application. Fig.11As shown, the charging control method of the charging control device provided in the embodiment of the present application includes the following steps.

[0032] Step 110: Detect the voltage drop of the first resistor and the voltage drop of the second resistor.

[0033] Step 120: Determine the current flowing through the charged device according to the voltage drop of the first resistor and the voltage drop of the second resistor.

[0034] Step 130: Control the charging state of the charging module according to the current.

[0035] The charging control method of the charging control device provided in the embodiment of the present application is applied to the control module of the charging control device. Figure 1 , Figure 1 Schematic diagram of a charging control device disclosed in an embodiment of the present application. Figure 1 As shown, the charging control device may include a voltage conversion module, a charging module and a control module. The charging module may include a first charging seat J1, a second charging seat J2, a first resistor R1 and a second resistor R2.

[0036] The voltage conversion module is respectively connected to the charging module, the first end of the control module and the battery, the second end, the third end, the fourth end and the fifth end of the control module are respectively connected to the charging module, one end of the first resistor R1 is respectively connected to the first charging seat J1 and the second end of the control module, one end of the second resistor R2 is respectively connected to the second charging seat J2 and the third end of the control module, the other end of the first resistor R1 and the other end of the second resistor R2 are respectively connected to the ground end, and the first charging seat J1 and the second charging seat J2 are respectively connected to the charged device.

[0037] Since the voltage provided by the battery may be different from the working voltage required by the charging module and the control module, the battery cannot directly power the charging module and the control module. In order to ensure that the charging module and the control module can work normally, the voltage conversion module can first convert the first direct current provided by the battery into a second direct current of a preset voltage, and then the second direct current can be used to power the charging module and the control module.

[0038] The preset voltage is the operating voltage required by the charging module and the control module. Exemplarily, the preset voltage may be 3.3V.

[0039] The charging module can charge the charged device. Specifically, the charging module can charge the charged device according to or using the second direct current.

[0040] One of the first charging seat J1 and the second charging seat J2 is a positive pole, and the other charging seat is a negative pole. Therefore, when the first charging seat J1 and the second charging seat J2 are both connected to the charged device, the first charging seat J1 and the second charging seat J2 can be connected through the charged device, and current will flow through the first resistor R1 and the second resistor R2. When the first charging seat J1 and the second charging seat J2 are not both connected to the charged device, that is, the first charging seat J1 and the second charging seat J2 are not connected to the charged device, or the first charging seat J1 (or the second charging seat J2) is connected to the charged device, and the second charging seat J2 (or the first charging seat J1) is not connected to the charged device, the first charging seat J1 and the second charging seat J2 are in an open circuit state, and no current flows through the first resistor R1 and the second resistor R2.

[0041] When the charging module does not charge the charged device, the voltage drop of the first resistor R1 and the voltage drop of the second resistor R2 are both 0. When the charging module charges the charged device, the voltage drop of the first resistor R1 and the voltage drop of the second resistor R2 are both greater than 0. Therefore, the control module can determine whether the charging module is in a charging state according to the voltage drop of the first resistor R1 and the second resistor R2. When the voltage drop of the first resistor R1 and the second resistor R2 is greater than 0, the control module can determine that the charging module is in a charging state. When the voltage drop of the first resistor R1 and the second resistor R2 is equal to 0, the control module can determine that the charging module is not in a charging state.

[0042] When the charging module is in the charging state, the control module can detect the voltage drop of the first resistor R1 and the voltage drop of the second resistor R2, and then determine the current flowing through the charged device according to the voltage drop of the first resistor R1 and the voltage drop of the second resistor R2, and then control the charging state of the charging module according to the current flowing through the charged device.

[0043] The first resistor R1 and the second resistor R2 are sampling resistors. Exemplarily, the resistance value of the first resistor R1 and the second resistor R2 may range from 10Ω to 15Ω. The specific values ​​of the first resistor R1 and the second resistor R2 may be determined based on experience, measurement, and the like.

[0044] The voltage drop of the first resistor R1 is the product of the resistance of the first resistor R1 and the current flowing through the first resistor R1. Since one end of the first resistor R1 is connected to the second end of the control module and the other end of the first resistor R1 is grounded, the voltage detected by the second end of the control module is the voltage drop of the first resistor R1.

[0045] Similarly, the voltage drop of the second resistor R2 is the product of the resistance of the second resistor R2 and the current flowing through the second resistor R2. The voltage detected by the third terminal of the control module is the voltage drop of the second resistor R2.

[0046] It can be seen that the control module can directly detect the voltage drop of the first resistor R1 and the voltage drop of the second resistor R2.

[0047] The charging state of the charging module can be a fast charging state or a slow charging state. The fast charging state is a fast charging state. The slow charging state is a slow charging state. The current flowing through the charged device in the fast charging state is greater than the current flowing through the charged device in the slow charging state.

[0048] Since the charged device is connected to the first charging socket J1 and the second charging socket J2 respectively, the absolute value of the difference between the voltage drop of the first resistor R1 and the voltage drop of the second resistor R2 is the voltage drop of the charged device. Since the resistance of the charged device is known, the current flowing through the charged device can be determined according to the voltage drop of the charged device and the resistance of the charged device.

[0049] It can be seen that the control module can first measure the voltage drop across the two sampling resistors in the charging module, and then determine the current flowing through the charged device based on the voltage drop across the two resistors, that is, only two resistors are needed to determine the current flowing through the charged device, and no special integrated chip is required, which can reduce the cost of the charging control device. In addition, the control module can control the charging state of the charging module based on the current flowing through the charged device, so that the charged device can be charged with a large current when a large current is required, and can be charged with a small current when a large current is not required, which can achieve charging flexibility, fast charging, and prevention of overcharge, and can save power consumption.

[0050] In some embodiments, when the current flowing through the charged device is less than or equal to a first current threshold, the control module controls the charging module to be in a slow charging state; when the current flowing through the charged device is greater than the first current threshold and less than a second current threshold, the control module controls the charging module to be in a fast charging state.

[0051] When the charging module is charging the device being charged, the current flowing through the device being charged is not fixed, but changes with the change of the charge of the device being charged. As the charge of the device being charged increases, the current flowing through the device being charged decreases. When the charge of the device being charged is fully charged, the current flowing through the device being charged is the first current threshold.

[0052] After the charged device is fully charged, if the charging of the charged device is stopped immediately and the user does not use the charged device, the charged device will consume power, so that when the user uses the charged device, the power of the fully charged device will be consumed. Therefore, after the power of the charged device is fully charged, the charged device can continue to be charged with a small current, which can replenish the power consumed by the charged device and keep the charged device in a fully charged state, thereby avoiding the situation where the power of the charged device is not fully charged due to the power consumption of the charged device when the user uses the charged device.

[0053] When the current flowing through the charged device is less than or equal to the first current threshold, it indicates that the charged device is fully charged. The control module can control the charging module to be in a slow charging state, and use a small current to continue charging the charged device, which can avoid the situation where the charged device consumes power and the power is not full, can prevent overcharging, and can save power consumption. When the current flowing through the charged device is greater than the first current threshold and less than the second current threshold, it indicates that the charged device is not fully charged. The control module can control the charging module to be in a fast charging state, and use a large current to charge the charged device, which can achieve fast charging of the charged device.

[0054] It can be seen that the control module controls the charging module to be in a fast charging state or a slow charging state according to the current flowing through the charged device, which can achieve charging flexibility, can realize fast charging of the charged device, can avoid the situation where the charged device is not fully charged due to power consumption after being fully charged, and can avoid overcharging of the charged device.

[0055] In some embodiments, when the charged device is fully charged, the control module can control the charging module to be in a slow charging state, and a small current can be used to continue to charge the charged device. Those skilled in the art can understand that the battery power will slowly decrease. When the power is relatively full, the slow charging state can be maintained to slow down the rate of decrease of the battery power. When the power gradually decreases to a preset threshold (when the current flowing through the charged device is greater than the first current threshold and less than the preset current threshold; wherein the preset current threshold is less than the second current threshold), the battery power is small and can be switched to a fast charging state, using a large current to charge the charged device, thereby quickly restoring the battery power.

[0056] In some embodiments, when the current flowing through the charged device is greater than or equal to the second current threshold for a preset period of time, the control module controls the charging module to stop charging the charged device.

[0057] In the case of a short circuit between the first charging seat J1 and the second charging seat J2, the control module determines that the current flowing through the charged module is large. If the charging module uses this current for charging for a long time, the battery may be burned out. For example, if metal accidentally falls on the first charging seat J1 and the second charging seat J2, the first charging seat J1 and the second charging seat J2 will be short-circuited by the metal.

[0058] When the control module determines that the current flowing through the charged device is greater than or equal to the second current threshold, the control module can monitor the duration of the current greater than or equal to the second current threshold. When the control module detects that the duration of the current greater than or equal to the second current threshold is a preset duration, it indicates that there is a short circuit between the first charging socket J1 and the second charging socket J2. The control module can control the charging module to stop charging the charged device, which can avoid the battery from burning out due to excessive current, thereby improving the safety of the battery.

[0059] The first resistor R1 and the second resistor R2 also have a current limiting function. In the case of a short circuit between the first charging station J1 and the second charging station J2, the first resistor R1 and the second resistor R2 can limit the current flowing through the first charging station J1 and the second charging station J2 to a third threshold current.

[0060] Exemplarily, the first threshold current may be 1 mA, the second threshold current may be 200 mA, the third threshold current may be 220 mA, and the preset time length may be 3 seconds.

[0061] It should be understood that the above is an exemplary description of the values ​​of the first threshold current, the second threshold current, the third threshold current and the preset time length, and does not limit the values ​​of the first threshold current, the second threshold current, the third threshold current and the preset time length.

[0062] In some embodiments, the battery may include a thermistor, and the thermistor is connected to the sixth terminal of the control module. The charging control method provided in the embodiment of the present application also includes the following steps.

[0063] (1) Detect the voltage drop across the thermistor.

[0064] (2) Determine the battery temperature based on the voltage drop across the thermistor.

[0065] (3) When the temperature is greater than or equal to a first temperature threshold, the charging module is controlled to stop charging the charged device.

[0066] (4) When the temperature is lower than a second temperature threshold, the charging module is controlled to charge the charged device, and the second temperature threshold is lower than the first temperature threshold.

[0067] In an embodiment of the present application, the control module detects the voltage drop of the thermistor, determines the temperature of the battery based on the voltage drop of the thermistor, and when the temperature of the battery is greater than or equal to a first temperature threshold, controls the charging module to stop charging the charged device; when the temperature of the battery is less than a second temperature threshold, controls the charging module to charge the charged device, and the second temperature threshold is less than the first temperature threshold.

[0068] The thermistor may be a negative temperature coefficient (NTC) thermistor.

[0069] The resistance of a thermistor changes with temperature. The resistance of an NTC thermistor decreases as the temperature increases. Therefore, the current of an NTC thermistor increases as the temperature increases, and the voltage drop of an NTC thermistor decreases as the temperature increases.

[0070] The heat generated by the battery is proportional to the square of the battery's operating current. Therefore, the greater the battery's operating current, the greater the battery's heat generation. When the battery's heat generation is greater than the battery's heat dissipation, the battery's temperature will rise, and if the battery temperature is too high, it will burn out.

[0071] The control module can detect the voltage drop of the thermistor through the sixth terminal, and then determine the resistance of the thermistor according to the voltage drop of the thermistor, and then determine the temperature corresponding to the resistance of the thermistor according to the corresponding relationship between the resistance of the thermistor and the temperature, and obtain the temperature of the battery. When the temperature of the battery is greater than or equal to the first temperature threshold, it indicates that the temperature of the battery is high. If the battery continues to work, the battery may burn out due to excessive temperature. Therefore, in order to avoid the battery from burning out due to excessive temperature, the control module can control the charging module to stop charging the charged device, and then reduce the working current of the battery to reduce the temperature of the battery. When the temperature of the battery is less than the second temperature threshold, it indicates that the temperature of the battery is low, or the temperature of the battery has dropped to a low level, and the control module can control the charging module to continue charging the charged device. The second temperature threshold is less than the first temperature threshold.

[0072] Exemplarily, the first temperature threshold may be 45°, and the second temperature threshold may be 30°.

[0073] In some embodiments, see Figure 2 , Figure 2 is a schematic diagram of the structure of another charging control device disclosed in an embodiment of the present application. Figure 2 The charging control device shown is composed of Figure 1 The charging control device shown is optimized. Figure 2As shown, the charging control device may further include a buzzer module, which is respectively connected to the seventh terminal of the control module and the voltage conversion module.

[0074] The voltage conversion module can also use the second direct current to power the buzzer module to ensure the normal operation of the buzzer module.

[0075] The charging control method of the charging control device provided in the present application may further include the following steps.

[0076] (1) When the current is equal to the first current threshold, sending a first control signal to the buzzer module to control the buzzer module to output first prompt information according to the first control signal;

[0077] (2) When the current is greater than or equal to the second current threshold and the current is maintained for a preset period of time, a second control signal is sent to the buzzer module to control the buzzer module to output a second prompt message.

[0078] The control module sends a first control signal to the buzzer module when the current flowing through the charged device is equal to the first current threshold, and sends a second control signal to the buzzer module when the current flowing through the charged device is greater than or equal to the second current threshold for a preset time.

[0079] The buzzer module can output first prompt information according to the first control signal, and can output second prompt information according to the second control signal.

[0080] When the current flowing through the charged device is equal to the first current threshold, it indicates that the charged device is fully charged, and the control module can send a first control signal to the buzzer module. After receiving the first control signal from the control module, the buzzer module can output a first prompt message according to the first control signal, which can remind the user that the charged device is fully charged, thereby improving the user experience.

[0081] Exemplarily, the first control signal may be a control signal that beeps three times. The first prompt information may be a control signal that beeps three times.

[0082] When the current flowing through the charged device is greater than or equal to the second current threshold value and is maintained for a preset period of time, it indicates that the first charging seat J1 and the second charging seat J2 are short-circuited, and the control module can send a second control signal to the buzzer module. After the buzzer module receives the second control signal from the control module, it can output a second prompt message according to the second control signal, which can remind the user that the first charging seat J1 and the second charging seat J2 are short-circuited, so that the user can check the first charging seat J1 and the second charging seat J2, solve the short-circuit problem between the first charging seat J1 and the second charging seat J2, and improve the user experience.

[0083] Exemplarily, the second control signal may be a control signal for a continuous alarm. The second prompt information may be a continuous alarm.

[0084] In some embodiments, see Figure 3 , Figure 3 Schematic diagram of a charging module disclosed in an embodiment of the present application. Figure 3 As shown, the charging module may further include a first switching device Q1, a second switching device Q2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a first capacitor C1, a second capacitor C2, a first diode D1 and a second diode D2.

[0085] The first end of the first switch device Q1 is respectively connected to one end of the third resistor R3, one end of the first capacitor C1 and one end of the fourth resistor R4, the second end of the first switch device Q1 is respectively connected to the other end of the third resistor R3, the other end of the first capacitor C1 and the voltage conversion module, the other end of the fourth resistor R4 is connected to the fourth end of the control module, the third end of the first switch device Q1 is respectively connected to one end of the second capacitor C2, one end of the fifth resistor R5, one end of the seventh resistor R7 and the second end of the second switch device Q2, the first end of the second switch device Q2 is respectively connected to the other end of the second capacitor C2, the other end of the fifth resistor R5 and one end of the sixth resistor R6, the other end of the sixth resistor R6 is connected to the fifth end of the control module, the third end of the second switch device Q2 is respectively connected to the other end of the seventh resistor R7, the positive electrode of the first diode D1 and the positive electrode of the second diode D2, the negative electrode of the first diode D1 is connected to the first charging seat J1, and the negative electrode of the second diode D2 is connected to the second charging seat J2.

[0086] The control module can control the first switch device Q1 to be turned on or off through the fourth terminal. The control module can control the second switch device Q2 to be turned on or off through the fifth terminal.

[0087] The first switch device Q1 and the second switch device Q2 may be P-type metal oxide semiconductor (MOS), or other switch devices with equivalent functions. Exemplarily, the first switch device Q1 and the second switch device Q2 may be insulated gate bipolar transistors (IGBT).

[0088] When the first charging socket J1 and the second charging socket J2 are respectively connected to the charged device, the control module can control the charging module to charge the charged device by controlling the first switch device Q1 to turn on through the fourth terminal, and can control the charging module to stop charging the charged device by controlling the first switch device Q1 to turn off through the fourth terminal.

[0089] The control module can control the charging module to be in a slow charging state by controlling the first switch device Q1 to be turned on through the fourth terminal and controlling the second switch device Q2 to be turned off through the fifth terminal. At this time, the charging circuit passes through the first switch device Q1 and the seventh resistor R7. The seventh resistor R7 has a current limiting function and can limit the charging current of the charged device. The resistance value of the seventh resistor R7 ranges from 300Ω to 620Ω. Exemplarily, the resistance value of the seventh resistor R7 can be 510Ω.

[0090] The control module can control the charging module to be in a fast charging state by controlling the first switch device Q1 to be turned on through the fourth terminal and controlling the second switch device Q2 to be turned on through the fifth terminal. At this time, the charging circuit passes through the first switch device Q1 and the second switch device Q2.

[0091] The first capacitor C1 and the second capacitor C2 have a slow start function. When the control module controls the first switch device Q1 to turn on through the fourth terminal, the voltage conversion module can charge the first capacitor C1, and the voltage Vgs between the gate and the source gradually decreases. When Vgs drops to the turn-on voltage of the PMOS tube, the first switch device Q1 is turned on. It can be seen that the first switch device Q1 is not turned on immediately, but is turned on only when the voltage Vgs between the gate and the source drops to the turn-on voltage of the PMOS tube as the first capacitor C1 is charged, which can delay the turn-on time of the first switch device Q1. In addition, the first switch device Q1 is slowly opened after being turned on, and the output voltage of the first switch device Q1 will also rise slowly, and the rising edge is relatively gentle, which can suppress the surge input current and effectively protect the charging control device.

[0092] Similarly, when the first switch device Q1 is turned on, and the control module controls the second switch device Q2 to be turned on through the fifth terminal, the voltage conversion module can charge the second capacitor C2 through the first switch device Q1, and the voltage Vgs between the gate and the source gradually decreases. When Vgs drops to the turn-on voltage of the PMOS tube, the second switch device Q2 is turned on. It can be seen that the second switch device Q2 is not turned on immediately, but is turned on only when the voltage Vgs between the gate and the source drops to the turn-on voltage of the PMOS tube as the second capacitor C2 is charged, which can delay the turn-on time of the second switch device Q2. In addition, the second switch device Q2 is slowly opened after being turned on, and the output voltage of the second switch device Q2 will also rise slowly, with a relatively gentle rising edge, which can suppress the surge input current and effectively protect the charging control device.

[0093] The third resistor R3 can ensure that the first switch device Q1 is in the off state. Exemplarily, during the power-on process of the charging control device, the third resistor R3 can ensure that the voltage Vgs between the gate and the source is greater than the conduction voltage of the PMOS tube, and can ensure that the first switch device Q1 is in the off state.

[0094] Similarly, the fifth resistor R5 can ensure that the second switch device Q2 is in the off state. Exemplarily, during the power-on process of the charging control device, the fifth resistor R5 can ensure that the voltage Vgs between the gate and the source is greater than the turn-on voltage of the PMOS tube, and can ensure that the second switch device Q2 is in the off state.

[0095] The fourth resistor R4 and the sixth resistor R6 have a current limiting function.

[0096] The first diode D1 and the second diode D2 may be Schottky diodes, which have the function of preventing current backflow. The first diode D1 and the second diode D2 can prevent a large external power source from being accidentally placed on the first charging station J1 and the second charging station J2, resulting in current backflow, so that the battery, the voltage conversion module and the control module are burned out due to excessive current.

[0097] The first charging seat J1 and the second charging seat J2 may be charging springs, and the charged device may be clamped on the charging springs for charging. The first charging seat J1 and the second charging seat J2 may also be sockets, and the charged device may be plugged into the sockets for charging. The first charging seat J1 and the second charging seat J2 may also have other modules with equivalent functions.

[0098] For example, when the first charging seat J1 and the second charging seat J2 are charging springs, when metal kitchen utensils accidentally fall onto the first charging seat J1 and the second charging seat J2, a short circuit may be caused between the first charging seat J1 and the second charging seat J2.

[0099] In some embodiments, see Figure 4 , Figure 4 Schematic diagram of a voltage conversion module disclosed in an embodiment of the present application. Figure 4 As shown, the voltage conversion module may include a first filtering circuit, a second filtering circuit, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10 and a voltage conversion circuit.

[0100] The first filter circuit is respectively connected to the first end of the battery, one end of the eighth resistor R1 and the first end of the voltage conversion circuit, the other end of the eighth resistor R1 is respectively connected to one end of the ninth resistor R9 and the second end of the voltage conversion circuit, the third end of the voltage conversion circuit is respectively connected to one end of the tenth resistor R10, the second filter circuit, the charging module and the first end of the control module, and the other end of the tenth resistor R10 is connected to the second end of the battery.

[0101] After the first DC power provided by the battery is input to the voltage conversion module, the first filtering circuit can filter the first DC power to obtain a third DC power, and then the voltage conversion circuit can perform voltage conversion on the third DC power to obtain a fourth DC power of a preset voltage, and then the second filtering circuit can filter the fourth DC power to obtain a second DC power.

[0102] The first filter circuit filters the first DC power to ensure the stability of the third DC power of the input voltage conversion circuit. The second filter circuit filters the fourth DC power to ensure the stability of the second DC power of the output voltage conversion module, thereby ensuring the normal operation of the charging module and the control module.

[0103] The eighth resistor R8 and the ninth resistor R9 can divide the voltage of the first direct current provided by the battery, so that the voltage of the third direct current of the input voltage conversion circuit is lower than the voltage of the first direct current, thereby ensuring that the voltage conversion circuit cannot work when the battery voltage is too low or unstable, and avoiding continuous discharge when the battery is out of power.

[0104] The tenth resistor R10 is a pull-up resistor, one end of the tenth resistor R10 is connected to the output end of the voltage conversion module, the other end of the tenth resistor R10 is connected to one end of the thermistor in the battery, and the other end of the thermistor is connected to the ground. The tenth resistor R10 is connected in series with the thermistor. It can be seen that the power supply of the tenth resistor R10 is the voltage conversion module.

[0105] The control module can detect the voltage drop of the thermistor through the sixth terminal, and then calculate the difference between the preset voltage and the voltage drop of the thermistor to obtain the voltage drop of the tenth resistor R10. Since the resistance of the tenth resistor R10 is known, the ratio of the voltage drop of the tenth resistor R10 to the resistance of the tenth resistor R10 can be calculated to obtain the current flowing through the tenth resistor R10. Since the tenth resistor R10 is connected in series with the thermistor, the current flowing through the thermistor is the current flowing through the tenth resistor R10. The control module can calculate the ratio of the voltage drop of the thermistor to the current flowing through the thermistor to obtain the resistance of the thermistor, and then determine the temperature corresponding to the resistance of the thermistor according to the corresponding relationship between the resistance of the thermistor and the temperature, and obtain the temperature of the battery.

[0106] In some embodiments, see Figure 5 , Figure 5 is a schematic diagram of the structure of another voltage conversion module disclosed in the embodiment of the present application. Figure 5 The voltage conversion module shown is composed of Figure 4 The voltage conversion module shown is optimized. Figure 5 As shown, the voltage conversion module may further include a third capacitor C3.

[0107] One end of the third capacitor C3 is connected to one end of the ninth resistor R9, and the other end of the third capacitor C3 is connected to the ground.

[0108] The third capacitor C3 has a slow start function. Exemplarily, when the charging control device is powered on, the battery can be charged through the eighth resistor R8, so that the voltage drop on the third capacitor C3 continues to increase. When the voltage drop on the third capacitor C3 is equal to the working voltage of the voltage conversion circuit, the voltage conversion circuit will perform voltage conversion. It can be seen that the voltage conversion circuit does not work immediately, but works only when the voltage drop rises to the working voltage of the voltage conversion circuit as the third capacitor C3 is charged, which can delay the working time of the voltage conversion circuit.

[0109] The third capacitor C3 also has a filtering function and can filter out high-frequency noise.

[0110] In some embodiments, Figure 5 As shown, the first filtering circuit may include a fourth capacitor C4 and a fifth capacitor C5, and the second filtering circuit may include a sixth capacitor C6 and a seventh capacitor C7.

[0111] One end of the fourth capacitor C4 and one end of the fifth capacitor C5 are connected to one end of the eighth resistor R8 respectively, and the other end of the fourth capacitor C4 and the other end of the fifth capacitor C5 are connected to the ground respectively.

[0112] One end of the sixth capacitor C6 and one end of the seventh capacitor C7 are respectively connected to the third end of the voltage conversion circuit, and the other end of the sixth capacitor C6 and the other end of the seventh capacitor C7 are respectively connected to the ground.

[0113] The fourth capacitor C4 can filter out low-frequency noise. The fifth capacitor C5 can filter out high-frequency noise. The capacitance of the fourth capacitor C4 is greater than the capacitance of the fifth capacitor C5. Exemplarily, the capacitance of the fourth capacitor C4 can be uF, and the capacitance of the fifth capacitor C5 can be nF. For example, the capacitance of the fourth capacitor C4 can be 22uF, and the capacitance of the fifth capacitor C5 can be 100nF.

[0114] The sixth capacitor C6 can filter out high-frequency noise. The seventh capacitor C7 can filter out low-frequency noise. The capacitance of the seventh capacitor C7 is greater than the capacitance of the sixth capacitor C6. Exemplarily, the capacitance of the seventh capacitor C7 can be uF, and the capacitance of the sixth capacitor C6 can be nF. For example, the capacitance of the seventh capacitor C7 can be 22uF, and the capacitance of the sixth capacitor C6 can be 100nF.

[0115] The direct current output by the voltage conversion circuit can provide a stable voltage for the charging module and the control module after being filtered by the sixth capacitor C6 and the seventh capacitor C7.

[0116] In some embodiments, Figure 5 As shown, the voltage conversion circuit may include a voltage conversion chip U1 , an eleventh resistor R11 , and a twelfth resistor R12 .

[0117] The first end of the voltage conversion chip U1 is connected to one end of the eighth resistor R8, the second end of the voltage conversion chip U1 is connected to the other end of the eighth resistor R8, the third end of the voltage conversion chip U1 is respectively connected to one end of the eleventh resistor R11 and the second filtering circuit, the fourth end of the voltage conversion chip U1 is respectively connected to the other end of the eleventh resistor R11 and one end of the twelfth resistor R12, and the other end of the twelfth resistor R12 is connected to the ground.

[0118] The first end of the voltage conversion chip U1 is the first end of the voltage conversion circuit, the second end of the voltage conversion chip U1 is the second end of the voltage conversion circuit, and the third end of the voltage conversion chip U1 is the third end of the voltage conversion circuit.

[0119] The voltage conversion chip U1 can convert the third DC power into a fifth DC power, and the eleventh resistor R11 and the twelfth resistor R12 can adjust the voltage of the fifth DC power to obtain a fourth DC power. The output voltage of the eleventh resistor R11 is V1*((R 11 +R 12 ) / R 12 ). Wherein, V1 is the output voltage of the fourth terminal of the voltage conversion chip U1, R 11 is the resistance value of the eleventh resistor R11, R 12 is the resistance value of the twelfth resistor R12.

[0120] When the voltage conversion chip U1 is fixed, the resistance values ​​of the eleventh resistor R11 and the twelfth resistor R12 can be determined according to the preset voltage.

[0121] The voltage conversion chip U1 may be a low-dropout regulator (LDO), a BUCK step-down chip, a discrete device pressure reducing and stabilizing source, or other chips with equivalent functions.

[0122] For example, the voltage conversion chip U1 may be a chip of model ETA5050VOS2F. Figure 6 , Figure 6 Schematic diagram of an ETA5050VOS2F chip disclosed in the embodiment of the present application. Figure 6As shown, the first end of the voltage conversion chip U1 is the VIN pin of the ETA5050VOS2F chip, the second end of the voltage conversion chip U1 is the EN pin of the ETA5050VOS2F chip, the third end of the voltage conversion chip U1 is the OUT pin of the ETA5050VOS2F chip, and the fourth end of the voltage conversion chip U1 is the NC / FB pin of the ETA5050VOS2F chip. The GND pin of the ETA5050VOS2F chip is connected to the ground.

[0123] It should be understood that the above is an exemplary description of the voltage conversion chip U1 and does not limit the model of the voltage conversion chip U1.

[0124] In some embodiments, see Figure 7 , Figure 7 Schematic diagram of a control module disclosed in the embodiment of the present application. Figure 7 As shown, the control module may include a control chip U2, a crystal oscillator Y, a thirteenth resistor R13, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14 and an inductor L.

[0125] The first end of the control chip U2 is respectively connected to one end of the eighth capacitor C8 and the first end of the crystal oscillator Y, the second end of the control chip U2 is respectively connected to one end of the ninth capacitor C9 and the second end of the crystal oscillator Y, the third end of the control chip U2 is connected to one end of the thirteenth resistor R13, the fourth end of the control chip U2 is connected to one end of the tenth capacitor C10, the fifth end of the control chip U2 is respectively connected to one end of the eleventh capacitor C11, one end of the twelfth capacitor C12 and the voltage conversion module, the sixth end of the control chip U2 is connected to one end of the inductor L, the seventh end of the control chip U2 is respectively connected to the other end of the inductor L, one end of the thirteenth capacitor C13 and one end of the fourteenth capacitor C14, the other end of the eighth capacitor C8, The other end of the ninth capacitor C9, the third end of the crystal oscillator Y, the fourth end of the crystal oscillator Y, the other end of the tenth capacitor C10, the other end of the eleventh capacitor C11, the other end of the twelfth capacitor C12, the other end of the thirteenth capacitor C13, the other end of the fourteenth capacitor C14 and the other end of the thirteenth resistor R13 are respectively connected to the ground, the eighth end of the control chip U2 is the second end of the control module, the ninth end of the control chip U2 is the third end of the control module, the tenth end of the control chip U2 is the fourth end of the control module, the eleventh end of the control chip U2 is the fifth end of the control module, the twelfth end of the control chip U2 is the sixth end of the control module, and the thirteenth end of the control chip U2 is the seventh end of the control module.

[0126] The control chip U2 has the function of a control module, which will not be described in detail here.

[0127] The control chip U2 may be a microcontroller (Micro Control Unit, MCU), a central processing unit (Central Processing Unit, CPU), a Bluetooth (Blue Tooth, BT) system on chip (System On Chip, SOC), or a WIFI SOC.

[0128] For example, the control chip U2 may be a chip of model FR8018HA. Figure 8 , Figure 8 Schematic diagram of a FR8018HA chip disclosed in the embodiment of the present application. Figure 8 As shown, the first end of the control chip U2 is the XTALO_24M pin of the FR8018HA chip, the second end of the control chip U2 is the XTALI_24M pin of the FR8018HA chip, the third end of the control chip U2 is the RSTP pin of the FR8018HA chip, the fourth end of the control chip U2 is the LDO_OUT pin of the FR8018HA chip, the fifth end of the control chip U2 is the VBAT pin of the FR8018HA chip, the sixth end of the control chip U2 is the BSM pin of the FR8018HA chip, and the control chip U The seventh end of the control chip U2 is the BFB pin of the FR8018HA chip, the eighth end of the control chip U2 is the PD5 pin of the FR8018HA chip, the ninth end of the control chip U2 is the PD6 pin of the FR8018HA chip, the tenth end of the control chip U2 is the PB4 pin of the FR8018HA chip, the eleventh end of the control chip U2 is the PA1 pin of the FR8018HA chip, the twelfth end of the control chip U2 is the PD4 pin of the FR8018HA chip, and the thirteenth end of the control chip U2 is the PB7 pin of the FR8018HA chip.

[0129] It should be understood that the above is an exemplary description of the control chip U2 and does not limit the model of the control chip U2.

[0130] The crystal oscillator Y is a passive crystal oscillator. The crystal oscillator Y, the eighth capacitor C8 and the ninth capacitor C9 together generate a clock signal for the control chip U2.

[0131] The second direct current input by the voltage conversion module is filtered by the eleventh capacitor C11 and the twelfth capacitor C12 to provide a stable working voltage for the control chip U2. One of the eleventh capacitor C11 and the twelfth capacitor C12 can filter out high-frequency noise, and the other capacitor can filter out low-frequency noise.

[0132] The thirteenth resistor R13 is a pull-down resistor and can keep the reset pin of the control chip U2 at a low level during power-on, surge input, and electrostatic discharge (ESD), thereby preventing a sudden high level from resetting the control chip U2.

[0133] The thirteenth capacitor C13 and the fourteenth capacitor C14 are used for filtering. One of the thirteenth capacitor C13 and the fourteenth capacitor C14 can filter out high-frequency noise, and the other capacitor can filter out low-frequency noise.

[0134] The inductor L may be a laminated inductor or other inductors.

[0135] The thirteenth capacitor C13, the fourteenth capacitor C14 and the inductor L can output the direct current input to the control chip U2 to other input output (IO) ports of the control chip U2 for use after the direct current (DC)-DC voltage reduction is performed.

[0136] The tenth capacitor C10 has a filtering function and can output a stable voltage from the direct current input to the control chip U2 through a low voltage difference linear regulator to supply power to peripheral devices of the control chip U2.

[0137] In some embodiments, see Fig. 9 , Fig. 9 Schematic diagram of the structure of a buzzer module disclosed in the embodiment of the present application. Fig. 9 As shown, the buzzer module may include a third switch tube Q3, a buzzer B, a third diode D3, a fourteenth resistor R14 and a fifteenth resistor R15.

[0138] The first end of the third switch tube Q3 is respectively connected to one end of the fourteenth resistor R14 and one end of the fifteenth resistor R15, the other end of the fourteenth resistor R14 is connected to the seventh end of the control module, the second end of the third switch tube Q3 and the other end of the fifteenth resistor R15 are respectively connected to the ground, the third end of the third switch tube Q3 is respectively connected to one end of the buzzer B and the positive electrode of the third diode D3, and the other end of the buzzer B is respectively connected to the negative electrode of the third diode D3 and the voltage conversion module.

[0139] The fourteenth resistor R14 has a current limiting function and can prevent excessive current.

[0140] The fifteenth resistor R15 is a pull-down resistor, which has the functions of ensuring a default state, improving noise tolerance, and preventing malfunction.

[0141] The third switch tube Q3 may be a transistor, such as an npn-type transistor; or may be other semiconductor switch devices with equivalent functions.

[0142] The control module can control the conduction and shutdown of the third switch tube Q3 through the seventh terminal, and then control the conduction and shutdown of the buzzer B, so that the buzzer B emits a corresponding sound after receiving the corresponding frequency, thereby outputting the corresponding prompt information. When the control module controls the conduction of the third switch tube Q3 through the seventh terminal, the buzzer B is turned on. When the control module controls the turn-off of the third switch tube Q3 through the seventh terminal, the buzzer B is turned off.

[0143] For example, the first control signal may be a pulse width modulation (PWM) signal. When the first control signal is at a high level, the third switch tube Q3 is turned on, thereby turning on the buzzer B to emit a sound to remind the user that the charging device is fully charged.

[0144] Exemplarily, the second control signal may be at a high level. When the current flowing through the charged device is greater than or equal to the second current threshold value and is maintained for a preset period of time, the second control signal may turn on the third switch tube Q3, thereby turning on the buzzer B and continuously sounding to remind the user that the charged device is short-circuited, so as to remind the user to check.

[0145] The third diode D3 is used to protect the buzzer B. In the case that the buzzer B is a passive buzzer, if the buzzer B switches from on to off, that is, the third switch tube Q3 switches from on to off, then due to the inductance characteristics, the coil in the buzzer B will generate a reverse electromotive force (i.e., back electromotive force). This high voltage may damage other components in the buzzer B. A diode is connected in parallel at both ends of the buzzer B to provide a discharge path for this reverse electromotive force. When the current of the buzzer B is suddenly interrupted, the third diode D3 is turned on, allowing the remaining energy in the coil in the buzzer B to form a loop through the third diode D3 and be consumed in the form of heat energy, thereby protecting the sensitive components in the buzzer B from the impact of high voltage spikes. Therefore, the smooth decline of the current can be ensured, thereby avoiding possible failures.

[0146] In some embodiments, the charging control device can be applied to a barbecue thermometer. The thermometer can include the charging control device, which includes a voltage conversion module, a charging module and a control module. The charging module includes a first charging seat, a second charging seat, a first resistor and a second resistor. The voltage conversion module is connected to the first end of the charging module and the control module and the battery respectively. The second end, the third end, the fourth end and the fifth end of the control module are connected to the charging module respectively. One end of the first resistor is connected to the first charging seat and the second end of the control module respectively. One end of the second resistor is connected to the second charging seat and the third end of the control module respectively. The other end of the first resistor and the other end of the second resistor are grounded respectively. The first charging seat and the second charging seat are connected to the charged device respectively. The control module uses the charging control method of the charging device as described above to perform charging control.

[0147] Barbecue is a kind of food that people like, and different meats may require different roasting temperatures. Even for the same kind of meat, different users may prefer different degrees of doneness, so different roasting temperatures need to be used to roast different barbecues. In order to solve the above problem, a barbecue thermometer is needed, which can monitor the temperature inside the meat. Exemplarily, the barbecue thermometer can be shaped like a steel needle, which can be inserted into the barbecue to detect the temperature inside the meat, so that the roasting state of the meat and / or the doneness of the meat can be determined by the temperature inside the meat.

[0148] For example, see 10, Fig.10 Schematic diagram of the structure of a barbecue thermometer disclosed in the embodiment of the present application. Fig.10 As shown, the barbecue thermometer may include a wireless probe and a charging control device. The charging control device may include a buzzer. The barbecue thermometer may also include a display device. The charging control device is connected to the display device. The wireless probe can be inserted into the meat to detect the temperature inside the meat, and the detected temperature of the meat can be sent to the charging control device in a wireless form. The charging control device can send the received temperature to the display device. The display device can display the temperature inside the meat. When the temperature inside the meat reaches a preset temperature, the charging control device can control the buzzer to work to prompt the user that the barbecue is ready. The preset temperature is a temperature set by the user as needed.

[0149] It should be understood that the above is an exemplary description of the structure of the barbecue thermometer, and does not limit the structure of the barbecue thermometer. Exemplarily, the barbecue thermometer may further include a temperature setting unit.

[0150] It should be understood that the connection in the present application can be understood as an electrical connection.

[0151] It should be understood that in different embodiments, the same or corresponding information may be referenced to each other.

[0152] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A charging control method for a charging control device, characterized in that: A control module applied to a charging control device, the charging control device comprising a voltage conversion module, a charging module and the control module, the charging module comprising a first charging seat, a second charging seat, a first resistor and a second resistor; The voltage conversion module is respectively connected to the charging module, the first end of the control module and the battery, the second end, the third end, the fourth end and the fifth end of the control module are respectively connected to the charging module, one end of the first resistor is respectively connected to the first charging seat and the second end of the control module, one end of the second resistor is respectively connected to the second charging seat and the third end of the control module, the other end of the first resistor and the other end of the second resistor are respectively grounded, and the first charging seat and the second charging seat are respectively connected to the charged device; The charging control method comprises: detecting a voltage drop across the first resistor and a voltage drop across the second resistor; determining a current flowing through the charged device according to a voltage drop of the first resistor and a voltage drop of the second resistor; The charging state of the charging module is controlled according to the current.

2. The charging control method according to claim 1, characterized in that: The controlling the charging state of the charging module according to the current comprises: When the current is less than or equal to a first current threshold, controlling the charging module to be in a slow charging state; When the current is greater than the first current threshold and less than the second current threshold, the charging module is controlled to be in a fast charging state.

3. The charging control method according to claim 1, characterized in that: The charging control method further includes: when the current is greater than or equal to the second current threshold value and is maintained for a preset time period, controlling the charging module to stop charging the charged device.

4. The charging control method according to claim 1, characterized in that: The battery includes a thermistor, and the thermistor is connected to the sixth terminal of the control module; The charging control method further includes: detecting a voltage drop across the thermistor; determining the temperature of the battery based on a voltage drop of the thermistor; When the temperature is greater than or equal to a first temperature threshold, controlling the charging module to stop charging the charged device; When the temperature is lower than a second temperature threshold, the charging module is controlled to charge the charged device, and the second temperature threshold is lower than the first temperature threshold.

5. The charging control method according to claim 4, characterized in that: The step of determining the temperature of the battery according to the voltage drop of the thermistor comprises: detecting a current flowing through the thermistor; Calculating a ratio of a voltage drop across the thermistor to a current flowing through the thermistor to determine a resistance value of the thermistor; The temperature of the battery is determined according to the relationship between the resistance value of the thermistor and the temperature.

6. The charging control method according to claim 3, characterized in that: The charging control device further includes a buzzer module, and the buzzer module is connected to the seventh terminal of the control module and the voltage conversion module respectively; the charging control method further includes: When the current is equal to the first current threshold, sending a first control signal to the buzzer module to control the buzzer module to output first prompt information according to the first control signal; When the current is greater than or equal to the second current threshold and the current is maintained for a preset period of time, a second control signal is sent to the buzzer module to control the buzzer module to output second prompt information through the second control signal.

7. The charging control method according to claim 2, characterized in that: The first current threshold is 1 mA.

8. The charging control method according to any one of claims 1 to 6, characterized in that: The resistance of the first resistor is 15Ω.

9. The charging control method according to claim 8, characterized in that: The method of determining the current flowing through the charged device according to the voltage drop of the first resistor and the voltage drop of the second resistor comprises: determining whether the charging module is in a charging state according to a voltage drop between the first resistor and the second resistor; When the charging module is in a charging state, a voltage drop of the first resistor and a voltage drop of the second resistor are detected to determine a current flowing through the charged device.

10. A thermometer, characterized in that: The thermometer comprises a charging control device, the charging control device comprises a voltage conversion module, a charging module and a control module, the charging module comprises a first charging seat, a second charging seat, a first resistor and a second resistor; The voltage conversion module is respectively connected to the charging module, the first end of the control module and the battery, the second end, the third end, the fourth end and the fifth end of the control module are respectively connected to the charging module, one end of the first resistor is respectively connected to the first charging seat and the second end of the control module, one end of the second resistor is respectively connected to the second charging seat and the third end of the control module, the other end of the first resistor and the other end of the second resistor are respectively grounded, and the first charging seat and the second charging seat are respectively connected to the charged device; the control module adopts the charging control method of the charging device as described in any one of claims 1 to 9 to perform charging control.

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