CN219535665U - Rechargeable battery management circuit for wireless probe and wireless probe device - Google Patents
Rechargeable battery management circuit for wireless probe and wireless probe device Download PDFInfo
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- CN219535665U CN219535665U CN202320223670.4U CN202320223670U CN219535665U CN 219535665 U CN219535665 U CN 219535665U CN 202320223670 U CN202320223670 U CN 202320223670U CN 219535665 U CN219535665 U CN 219535665U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model relates to a rechargeable battery management circuit for a wireless probe and wireless probe equipment, wherein a rechargeable battery module at least comprises a charging end and a rechargeable battery connected with a charging point end, a Bluetooth charging switch module is used for controlling the rechargeable battery to supply power to a Bluetooth chip, a control voltage supply module is used for dividing the charging voltage to obtain divided voltage, the difference between the divided voltage and the voltage on the positive electrode of the rechargeable battery is used as control voltage for controlling the on and off of the Bluetooth charging switch module, and as the divided voltage does not change along with the ambient temperature, when the charging voltage on the charging end rises along with the rising of the ambient temperature, the control voltage does not change along with the temperature, when the wireless probe is not arranged on a charging seat, the charging battery is controlled to supply power to the Bluetooth chip, and when the wireless probe is arranged on the charging seat to charge, the charging battery is controlled to supply power, the charging battery is disconnected from supplying power to the Bluetooth chip.
Description
Technical Field
The utility model relates to the field of household appliance accessories, in particular to a rechargeable battery management circuit for a wireless probe and a wireless probe device.
Background
The wireless probe is used for monitoring the temperature of food. Currently, all wireless probes on the market have bluetooth chips, and bluetooth chips are used for transmitting temperature data monitored by the wireless probes to other devices, for example, when the wireless probes monitor the temperature of food in an oven, the monitored temperature data are transmitted to the oven through the bluetooth chips, and the oven automatically adjusts the heating temperature according to the monitored temperature data so as to heat the food better. The Bluetooth chip is powered through a rechargeable battery in the wireless probe, when the wireless probe is placed on the charging seat to charge the rechargeable battery, the wireless probe is in an inactive state, the rechargeable battery needs to be disconnected to power the Bluetooth chip, and after the rechargeable battery is charged, the wireless probe leaves the charging seat and continuously resumes the power supply of the rechargeable battery to the Bluetooth chip.
In summary, a wireless probe's rechargeable battery management circuit is needed for the first time, and it can be realized that when wireless probe is not on the charging seat, control rechargeable battery supplies power to bluetooth chip, and when wireless probe is placed on the charging seat and is charged, when control supplies power to rechargeable battery, disconnect rechargeable battery and supply power to bluetooth chip.
Disclosure of Invention
The utility model provides a rechargeable battery management circuit for a wireless probe and a wireless probe device.
According to an aspect of the present utility model, there is provided in one embodiment a rechargeable battery management circuit for a wireless probe, comprising:
the charging battery module at least comprises a charging end and a charging battery connected with the charging end, and the charging end is used for receiving charging voltage so as to charge the charging battery under the condition that the wireless probe is placed on the charging seat; in the case where the wireless probe is not placed on a charging dock, the magnitude of the voltage on the charging terminal increases with an increase in ambient temperature;
the Bluetooth charging switch module is connected between the positive electrode of the rechargeable battery and the Bluetooth chip and used for controlling the rechargeable battery to supply power to the Bluetooth chip; wherein: under the condition that the wireless probe is placed on the charging seat, the Bluetooth charging switch module is disconnected, so that the rechargeable battery is disconnected to supply power to the Bluetooth chip; under the condition that the wireless probe is not placed on the charging seat, the Bluetooth charging switch module is conducted so that the rechargeable battery supplies power to the Bluetooth chip;
the control voltage supply module is connected to the control end of the Bluetooth charging switch module and is used for obtaining the voltage at the charging end, dividing the voltage at the charging end to obtain divided voltage, and taking the difference between the divided voltage and the voltage at the positive electrode of the rechargeable battery as control voltage which is used for controlling the on and off of the Bluetooth charging switch module; wherein, when the voltage at the charging end changes along with the ambient temperature, the control voltage does not change along with the ambient temperature.
In one embodiment, the control voltage providing module includes: a first resistor, a second resistor and a thermistor;
one end of the first resistor is connected with the charging end, the other end of the first resistor is connected with the first end of the thermistor, the other end of the thermistor is connected with one end of the second resistor, and the other end of the second resistor is connected with the ground; and one end of the first resistor, which is connected with the thermistor, is used for outputting the divided voltage.
In one embodiment, the resistance of the thermistor is inversely related to the ambient temperature.
In one embodiment, the rechargeable battery module further includes:
the anode of the Schottky diode is connected with the charging end, the cathode of the Schottky diode is connected with the anode of the rechargeable battery, and the cathode of the rechargeable battery is connected with the ground.
In an embodiment, the bluetooth charging switch module comprises:
the switching tube comprises a first pole, a second pole and a control pole, wherein the first pole is connected with the positive pole of the rechargeable battery, the second pole is connected with the power supply end of the Bluetooth chip, and the control pole is used for obtaining the divided voltage.
In one embodiment, the difference between the voltage on the first pole of the switching tube and the voltage on the control pole of the switching tube is used as the control voltage, and the minimum value of the absolute value of the control voltage is
Wherein, R1 is the resistance of the first resistor, R2 is the resistance of the second resistor, RT (T1) is the resistance of the thermistor when the ambient temperature is T1, and Vcharge is the voltage value at the charging end under the condition that the wireless probe is not placed on the charging seat.
In one embodiment, the difference between the voltage on the first pole of the switching tube and the voltage on the control pole of the switching tube is used as the control voltage, and the maximum value of the absolute value of the control voltage is
Wherein Vcc is the voltage on the positive electrode of the rechargeable battery, vd is the conduction voltage drop of the Schottky diode, R1 is the resistance value of the first resistor, R2 is the resistance value of the second resistor, and RT (T0) is the resistance value of the thermistor when the ambient temperature is T0.
In an embodiment, the switching tube is a P-type MOS tube.
In one embodiment, the charging stand includes:
the positive charging port is connected with the charging end, and the negative charging port is connected with the negative electrode of the rechargeable battery.
According to an aspect of the present utility model, there is provided in one embodiment a wireless probe apparatus including:
the wireless probe comprises a Bluetooth chip and the rechargeable battery management circuit in any embodiment;
a charging stand; wherein:
the rechargeable battery management circuit is used for controlling the Bluetooth chip to be powered under the condition that the wireless probe is not placed on the charging seat; and under the condition that the wireless probe is placed on the charging seat, the rechargeable battery management circuit is used for controlling the rechargeable battery to be charged and disconnecting the power supply of the Bluetooth chip.
According to the embodiment, the rechargeable battery management circuit for the wireless probe and the wireless probe device comprise the rechargeable battery module, the Bluetooth charging switch module and the control voltage supply module, wherein the rechargeable battery module at least comprises a charging end and a rechargeable battery connected with the charging end, the charging voltage on the charging end is in positive correlation with the ambient temperature, the Bluetooth charging switch module is used for controlling the rechargeable battery to supply power to the Bluetooth chip, the control voltage supply module is used for dividing the charging voltage to obtain divided voltage, the difference between the divided voltage and the voltage on the positive electrode of the rechargeable battery is used as the control voltage for controlling the Bluetooth charging switch module to be turned on and off, and the divided voltage does not change along with the ambient temperature, so that when the charging voltage on the charging end rises along with the rise of the ambient temperature, the control voltage does not change along with the rise of the ambient temperature, the rechargeable battery is controlled to supply power to the Bluetooth chip when the wireless probe is not arranged on the charging seat, and when the wireless probe is charged on the charging seat, the rechargeable battery is controlled to supply power to the Bluetooth chip.
Drawings
FIG. 1 is a schematic diagram of an example of a rechargeable battery management circuit in a wireless probe;
FIG. 2 is a schematic diagram of a rechargeable battery management circuit for a wireless probe according to an embodiment of the present utility model;
FIG. 3 is a schematic circuit diagram of a rechargeable battery management circuit for a wireless probe according to one embodiment of the present utility model;
FIG. 4 is a schematic diagram of a simulation circuit of a rechargeable battery management circuit for a wireless probe;
FIG. 5 is a schematic diagram illustrating a simulation of the Bluetooth chip power supply voltage when the wireless probe of an embodiment is not in the cradle;
FIG. 6 is a schematic diagram illustrating a simulation of the Bluetooth chip power supply voltage when the wireless probe of another embodiment is not in the cradle;
FIG. 7 is a schematic diagram illustrating a simulation of the Bluetooth chip power supply voltage when the wireless probe of another embodiment is not in the cradle;
FIG. 8 is a schematic diagram illustrating a simulation of the Bluetooth chip supply voltage when the wireless probe is on the cradle according to one embodiment;
FIG. 9 is a schematic diagram illustrating a simulation of the Bluetooth chip power supply voltage when the wireless probe of another embodiment is on the cradle;
FIG. 10 is a schematic diagram illustrating a simulation of the Bluetooth chip power supply voltage when the wireless probe of another embodiment is on the cradle;
fig. 11 is a schematic structural diagram of a wireless probe device according to an embodiment of the present utility model.
Detailed Description
The utility model will be described in further detail below with reference to the drawings by means of specific embodiments. Wherein like elements in different embodiments are numbered alike in association. In the following embodiments, numerous specific details are set forth in order to provide a better understanding of the present utility model. However, one skilled in the art will readily recognize that some of the features may be omitted, or replaced by other elements, materials, or methods in different situations. In some instances, related operations of the present utility model have not been shown or described in the specification in order to avoid obscuring the core portions of the present utility model, and may be unnecessary to persons skilled in the art from a detailed description of the related operations, which may be presented in the description and general knowledge of one skilled in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments, and the operational steps involved in the embodiments may be sequentially exchanged or adjusted in a manner apparent to those skilled in the art. Accordingly, the description and drawings are merely for clarity of describing certain embodiments and are not necessarily intended to imply a required composition and/or order.
The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The term "coupled" as used herein includes both direct and indirect coupling (coupling), unless otherwise indicated.
The wireless probe is used for monitoring food temperature, the rechargeable battery and the Bluetooth chip are arranged in the wireless probe, the rechargeable battery is used for supplying power to the wireless probe and the Bluetooth chip, after the food temperature is monitored, the wireless probe can be transmitted to other equipment through the Bluetooth chip, for example, the food temperature can be transmitted to the steaming oven through the Bluetooth chip, and the steaming oven can automatically adjust the heating temperature of the equipment according to the transmitted food temperature. When the rechargeable battery needs to be charged, the wireless probe needs to be placed on the charging seat, the rechargeable battery is charged by the charging seat, at the moment, the power supply of the wireless probe to the Bluetooth chip is in a disconnected state, and after the wireless probe leaves the charging seat to start working, the rechargeable battery in the wireless probe supplies power to the Bluetooth chip.
Referring to fig. 1, fig. 1 is an example of a rechargeable battery management circuit in a wireless probe, wherein the charging port+ and the charging port are charging ports on a charging seat, the bluetooth chip is a bluetooth chip built in the wireless probe, the rechargeable battery management circuit comprises a schottky diode D1, a rechargeable battery Bat, a charging end a, a first resistor R1, a second resistor R2 and a PMOS transistor Q1, the charging end a is connected with an anode of the schottky diode D1, a cathode of the schottky diode D1 is connected with an anode of the rechargeable battery Bat, a cathode of the rechargeable battery Bat is connected with a ground, an anode of the rechargeable battery Bat is also connected with an S pole of a PMOS transistor Q1, a G pole of the PMOS transistor Q1 is connected with the ground through the second resistor R2, and a D pole of the PMOS transistor Q1 is connected with the bluetooth chip; when the wireless probe is placed on the charging seat, the charging port+ is connected with the charging end A, and the charging port-is connected with the negative electrode of the rechargeable battery Bat. When the wireless probe is not placed on the charging seat, no voltage exists on the charging end A, at the moment, the voltage difference between the G pole and the S pole of the PMOS tube Q1 is larger than the conducting voltage Vgth and Q1 of the PMOS tube Q1, and at the moment, the voltage VCC output by the positive pole of the rechargeable battery Bat is directly loaded to the Vdd pin of the Bluetooth chip, and the Bluetooth chip realizes power supply. When the wireless probe is placed on the charging seat, the charging seat charges a rechargeable battery Bat of the wireless probe, at the moment, the voltage Vcharge on the charging end A is a charging voltage, and due to the fact that the charging voltage Vcharge is connected, the voltage difference between the G pole and the S pole of the PMOS tube Q1 is smaller than the conducting voltage Vth and Q1 of the PMOS tube Q1, and at the moment, the Bluetooth chip is disconnected from power supply.
For the battery management circuit, since the reverse leakage current of the schottky diode D1 is larger, and the reverse leakage current increases exponentially with the increase of the ambient temperature, and in addition, due to the standby requirement, the resistance values of the first resistor R1 and the second resistor R2 are both larger, under the condition of higher ambient temperature, the voltage Vcharge on the charging terminal a may be almost equal to the voltage Vcc output by the positive electrode of the rechargeable battery Bat due to the reverse leakage current of the schottky diode D1, so that the PMOS transistor Q1 is turned off, and the bluetooth chip is powered down when the bluetooth chip is powered up, that is, in the process of using the wireless probe, the situation that the bluetooth chip is powered down occurs due to higher ambient temperature. The above problem can be solved by selecting a schottky diode of a smaller reverse leakage current type, however, the on-current of the schottky diode of small reverse leakage current is small, which directly affects the charging speed of the wireless probe.
In the embodiment of the utility model, a thermistor is added in the rechargeable battery management circuit shown in fig. 1 to compensate the reduced voltage difference between the G pole and the S pole of the PMOS tube Q1 caused by the rise of the voltage Vcharge at the charging end A at high temperature, so that the voltage difference between the G pole and the S pole of the PMOS tube Q1 is unchanged under the condition that the voltage Vcharge at the charging end A changes along with the ambient temperature, the problem of power failure of a Bluetooth chip under the high temperature condition is solved, and the charging speed of a wireless probe is not influenced.
Referring to fig. 2, fig. 2 is a schematic diagram showing a rechargeable battery management circuit for a wireless probe according to an embodiment of the utility model, wherein the rechargeable battery management circuit includes: a rechargeable battery module 11, a bluetooth charging switch module 12, and a control voltage supply module 13.
As shown in fig. 3, the rechargeable battery module 11 includes a schottky diode D1, a charging terminal a and a rechargeable battery Bat, the charging terminal a is connected to an anode of the schottky diode D1, a cathode of the schottky diode D1 is connected to a cathode of the rechargeable battery Bat, and a cathode of the rechargeable battery Bat is connected to ground. Under the condition that the wireless probe is placed on the charging seat, the charging end A is used for receiving charging voltage, and the voltage Vccharge on the charging end A is the charging voltage at the moment; when the wireless probe is not placed on the charging stand, the voltage Vcharge on the charging terminal a should be substantially 0 due to the small reverse leakage current of the schottky diode D1 when the ambient temperature is low, and the bluetooth chip in the wireless probe is normally powered, but the reverse leakage current of the schottky diode D1 increases with the increase of the temperature, and the voltage Vcharge on the charging terminal a increases with the increase of the temperature.
The bluetooth charging switch module 12 is connected between the positive pole of the rechargeable battery Bat and the bluetooth chip, and the bluetooth charging control module 12 is used for controlling the rechargeable battery Bat to supply power to the bluetooth chip. Wherein: in the case where the wireless probe is placed on the cradle, the bluetooth charging switch module 12 is turned off to disconnect the rechargeable battery from powering the bluetooth chip; under the condition that the wireless probe is not placed on the charging seat, the Bluetooth charging switch module is conducted so that the rechargeable battery supplies power to the Bluetooth chip.
The control voltage supply module 13 is connected to a control end of the bluetooth charging switch module 12, and is configured to obtain a voltage Vcharge at the charging end, divide the voltage Vcharge at the charging end to obtain a divided voltage Vg, and use a difference between the divided voltage Vg and the voltage Vcc at the positive electrode of the rechargeable battery Bat as a control voltage Vgs, where the control voltage Vgs is configured to control on and off of the bluetooth charging switch module 12; when the voltage Vcharge at the charging terminal changes with the ambient temperature, the control voltage Vgs does not change with the ambient temperature.
In some embodiments, the bluetooth charging control module 12 includes a switching tube having a first pole connected to the positive pole of the rechargeable battery Bat, a second pole connected to the power supply terminal of the bluetooth chip, and a control pole for obtaining the divided voltage Vg. In an embodiment, the switch tube may be a P-type MOS tube, i.e., a PMOS tube Q1, in which S is a first pole, G is a control pole, D is a second pole, and the control voltage is a voltage difference Vgs between Vg and Vcc. In other embodiments, the switching transistor may be another type of MOS transistor or a transistor, which is not described herein.
In some embodiments, the control voltage supply module 13 includes: a first resistor R1, a second resistor R2, and a thermistor RT; one end of the first resistor R1 is connected with the charging end A, the other end of the first resistor R1 is connected with the first end of the thermistor RT, the other end of the thermistor RT is connected with one end of the second resistor R2, and the other end of the second resistor R2 is connected with the ground; one end of the first resistor R1 connected to the thermistor RT is used for outputting the divided voltage Vg. The resistance of the thermistor RT is inversely related to the ambient temperature, that is, the higher the ambient temperature is, the smaller the resistance of the thermistor RT is. In this way, after the ambient temperature increases, the voltage Vcharge at the charging terminal a increases, and if the thermistor RT is not heated, the divided voltage Vg also increases with the increase of Vcharge.
In this embodiment, when the voltage Vcharge at the charging terminal a is divided, the thermistor RT is added to compensate for the increase of the divided voltage Vg caused by the increase of the voltage Vcharge at the charging terminal a, so that when the voltage Vcharge at the charging terminal a increases with the increase of the ambient temperature, the divided voltage Vg can be kept unchanged, so that the control voltage Vgs remains unchanged, and the bluetooth charging control module 12 remains in a conductive state, so as to realize that the bluetooth chip is not powered down.
In some embodiments, the minimum turn-on voltage of the PMOS transistor Q1 needs to satisfy the following expression:
wherein vgth_min is the minimum value of the on voltage of Q1, R1 is the resistance of the first resistor, R2 is the resistance of the second resistor, RT (T1) is the resistance of the thermistor when the ambient temperature is T1, vcharge is the voltage value at the charging end when the wireless probe is not placed on the charging seat, the voltage is the voltage formed by the reverse leakage current of the schottky diode D1, and the higher the ambient temperature is, the greater the Vcharge is.
According to the minimum on-voltage of the PMOS transistor Q1, the absolute value of the control voltage is the minimum value
In some embodiments, in order to disconnect the bluetooth chip from power supply when the wireless probe is placed on the charging stand, the maximum on-voltage of the PMOS transistor Q1 also needs to satisfy the following expression:
wherein vgth_max is the maximum on voltage of the PMOS transistor Q1, vcc is the voltage on the positive electrode of the rechargeable battery Bat, vd is the on voltage drop of the schottky diode D1, R1 is the resistance of the first resistor, R2 is the resistance of the second resistor, and RT (T0) is the resistance of the thermistor when the ambient temperature is T0.
According to the maximum on-voltage of the PMOS transistor Q1, the absolute value of the control voltage has the maximum value of
Referring to fig. 4, fig. 4 is a schematic diagram of a simulation circuit of a rechargeable battery management circuit for a wireless probe, in the simulation experiment, r11=10kΩ, r12=51kΩ, r13=100deg.kΩ, a thermistor model NCP03WF104F05RL (100 kΩ resistance precision: ±1% 4250k) is formed by connecting two thermistors RT1 and RT2 in series, a PMOS transistor Q1 model RZM002P02T2L, a schottky diode D1 model RB520G-30, a rechargeable battery Bat model 3mAH, 2.4V (full 2.7V, discharge cut-off voltage 1.7V), and bluetooth chip equivalent power consumption 30kΩ, and the simulation verification is performed according to the above parameters, and the simulation results are as follows:
the minimum electric quantity of the rechargeable battery Bat is 1.7V, and when the ambient temperature is-20 ℃, -10 ℃, 0 ℃, 25 ℃, 50 ℃, 75 ℃, 105 ℃ and the wireless probe is not on the charging seat, the Vdd power supply condition is shown in fig. 5, and the simulation result shows that the Bluetooth chip can be normally powered, so that the requirement is met.
The rated voltage of the rechargeable battery Bat is 2.4V, and the Vdd power supply condition is shown in fig. 6 when the environment temperature is-20 ℃, -10 ℃, 0 ℃, 25 ℃, 50 ℃, 75 ℃, 105 ℃ and the wireless probe is not on the charging seat, so that the simulation result shows that the Bluetooth chip can be normally powered to meet the requirements.
The rechargeable battery Bat is full of 2.7V, and Vdd is powered when the environment temperature is-20 ℃, -10 ℃, 0 ℃, 25 ℃, 50 ℃, 75 ℃, 105 ℃ and the wireless probe is not on the charging seat, as shown in fig. 7, the simulation result shows that the Bluetooth chip can be powered normally, and the requirement is met.
The wireless probe is arranged on a charging seat, the electric quantity of the rechargeable battery Bat is 1.7V at the lowest, and the power supply condition of the Bluetooth chip is shown in the figure 8 when the ambient temperature is-20 ℃, 10 ℃, 0 ℃, 25 ℃, 50 ℃, 75 ℃, 105 ℃ and Vdd, so that the simulation result shows that the Bluetooth chip is powered off to meet the requirements.
The wireless probe is arranged on a charging seat, the rated voltage of a rechargeable battery Bat is 2.4V, and the power supply condition of Vdd is shown in figure 9 when the ambient temperature is-20 ℃, -10 ℃, 0 ℃, 25 ℃, 50 ℃, 75 ℃, 105 ℃ and the power supply condition of the Vdd is shown in figure 9, and the simulation result shows that the Bluetooth chip is powered off to meet the requirements.
The wireless probe is on the charging stand, the battery is full of 2.7V, and the power supply condition of the Bluetooth chip is shown in figure 10 when the ambient temperature is-20 ℃, -10 ℃, 0 ℃, 25 ℃, 50 ℃, 75 ℃, 105 ℃ and Vdd, and the simulation result shows that the Bluetooth chip is powered off to meet the requirements.
As can be seen from the above simulation verification, the rechargeable battery management circuit for the wireless probe provided by the embodiment of the utility model can realize the selection of the Schottky diode with larger reverse leakage current of about 50uA (100 ℃), thereby realizing faster charging speed (100 mA) and greatly improving the charging speed.
Referring to fig. 11, the embodiment of the utility model further provides a wireless probe device, where the wireless probe device includes a wireless probe 100 and a charging stand 200, the wireless probe 100 includes a bluetooth chip 101 and a rechargeable battery management circuit 102, the charging stand 200 includes a positive charging port 201 and a negative charging port 202, the positive charging port 201 is connected with the charging terminal, and the negative charging port 202 is connected with the negative electrode of the rechargeable battery Bat. The specific implementation of any one of the charge management circuits provided in the foregoing embodiments is described in detail in the foregoing embodiments, and is not repeated herein.
The foregoing description of the utility model has been presented for purposes of illustration and description, and is not intended to be limiting. Several simple deductions, modifications or substitutions may also be made by a person skilled in the art to which the utility model pertains, based on the idea of the utility model.
Claims (10)
1. A rechargeable battery management circuit for a wireless probe, comprising:
the charging battery module at least comprises a charging end and a charging battery connected with the charging end, and the charging end is used for receiving charging voltage so as to charge the charging battery under the condition that the wireless probe is placed on the charging seat; in the case where the wireless probe is not placed on a charging dock, the magnitude of the voltage on the charging terminal increases with an increase in ambient temperature;
the Bluetooth charging switch module is connected between the positive electrode of the rechargeable battery and the Bluetooth chip and used for controlling the rechargeable battery to supply power to the Bluetooth chip; wherein: under the condition that the wireless probe is placed on the charging seat, the Bluetooth charging switch module is disconnected, so that the rechargeable battery is disconnected to supply power to the Bluetooth chip; under the condition that the wireless probe is not placed on the charging seat, the Bluetooth charging switch module is conducted so that the rechargeable battery supplies power to the Bluetooth chip;
the control voltage supply module is connected to the control end of the Bluetooth charging switch module and is used for obtaining the voltage at the charging end, dividing the voltage at the charging end to obtain divided voltage, and taking the difference between the divided voltage and the voltage at the positive electrode of the rechargeable battery as control voltage which is used for controlling the on and off of the Bluetooth charging switch module; wherein, when the voltage at the charging end changes along with the ambient temperature, the control voltage does not change along with the ambient temperature.
2. The rechargeable battery management circuit of claim 1 wherein said control voltage providing module comprises: a first resistor, a second resistor and a thermistor;
one end of the first resistor is connected with the charging end, the other end of the first resistor is connected with the first end of the thermistor, the other end of the thermistor is connected with one end of the second resistor, and the other end of the second resistor is connected with the ground; and one end of the first resistor, which is connected with the thermistor, is used for outputting the divided voltage.
3. The rechargeable battery management circuit of claim 2 wherein the resistance of said thermistor is inversely related to ambient temperature.
4. The rechargeable battery management circuit of claim 2 wherein said rechargeable battery module further comprises:
the anode of the Schottky diode is connected with the charging end, the cathode of the Schottky diode is connected with the anode of the rechargeable battery, and the cathode of the rechargeable battery is connected with the ground.
5. The rechargeable battery management circuit of claim 4, wherein said bluetooth charging switch module comprises:
the switching tube comprises a first pole, a second pole and a control pole, wherein the first pole is connected with the positive pole of the rechargeable battery, the second pole is connected with the power supply end of the Bluetooth chip, and the control pole is used for obtaining the divided voltage.
6. The rechargeable battery management circuit of claim 5, wherein a difference between a voltage on a first pole of said switching tube and a voltage on a control pole of said switching tube is used as said control voltage, and an absolute value of said control voltage has a minimum value of
Wherein, R1 is the resistance of the first resistor, R2 is the resistance of the second resistor, RT (T1) is the resistance of the thermistor when the ambient temperature is T1, and Vcharge is the voltage value at the charging end under the condition that the wireless probe is not placed on the charging seat.
7. The rechargeable battery management circuit of claim 5, wherein a difference between a voltage on a first pole of said switching tube and a voltage on a control pole of said switching tube is used as said control voltage, and an absolute value of said control voltage has a maximum value of
Wherein Vcc is the voltage on the positive electrode of the rechargeable battery, vd is the on-voltage drop of the schottky diode, R1 is the resistance of the first resistor, R2 is the resistance of the second resistor, and RT (T0) is the resistance of the thermistor when the ambient temperature is T0.
8. The rechargeable battery management circuit of claim 5 wherein said switching tube is a P-type MOS tube.
9. The rechargeable battery management circuit of any one of claims 1 to 8, wherein said charging dock comprises:
the positive charging port is connected with the charging end, and the negative charging port is connected with the negative electrode of the rechargeable battery.
10. A wireless probe apparatus, comprising:
a wireless probe comprising a bluetooth chip and a rechargeable battery management circuit according to any one of claims 1 to 9;
a charging stand; wherein:
the rechargeable battery management circuit is used for controlling the Bluetooth chip to be powered under the condition that the wireless probe is not placed on the charging seat; and under the condition that the wireless probe is placed on the charging seat, the rechargeable battery management circuit is used for controlling the rechargeable battery to be charged and disconnecting the power supply of the Bluetooth chip.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320223670.4U CN219535665U (en) | 2023-01-17 | 2023-01-17 | Rechargeable battery management circuit for wireless probe and wireless probe device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320223670.4U CN219535665U (en) | 2023-01-17 | 2023-01-17 | Rechargeable battery management circuit for wireless probe and wireless probe device |
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| CN219535665U true CN219535665U (en) | 2023-08-15 |
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- 2023-01-17 CN CN202320223670.4U patent/CN219535665U/en active Active
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