CN210072020U - Bluetooth device - Google Patents
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- CN210072020U CN210072020U CN201920517213.XU CN201920517213U CN210072020U CN 210072020 U CN210072020 U CN 210072020U CN 201920517213 U CN201920517213 U CN 201920517213U CN 210072020 U CN210072020 U CN 210072020U
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Abstract
The utility model discloses a bluetooth equipment, through increase change over switch module in electric quantity detection module, this change over switch module can be when electric quantity detection module detects battery module's electric quantity, switch on the partial pressure branch road that is formed by a plurality of divider resistance, when electric quantity detection module stops to detect battery module's electric quantity, turn-off the partial pressure branch road, make after the bluetooth equipment goes up the electricity, if electric quantity detection module does not work, can not form the return circuit between battery module and each divider resistance, thereby not have the electric current to pass through on the divider resistance, thereby the electric quantity loss that the return circuit leakage current caused has been reduced, the electric quantity rate of utilization of battery module has been improved, the live time of bluetooth equipment has been prolonged.
Description
Technical Field
The utility model relates to the field of electronic technology, more specifically the utility model relates to a bluetooth device.
Background
The Bluetooth shield is a product for financial security transaction. Compared with the traditional first generation shield and the second generation shield, the Bluetooth shield has great improvement on the completeness of functions and the convenience of use. The Bluetooth shield establishes communication connection with devices such as a mobile phone and a tablet computer in a wireless mode to carry out information interaction, so that great convenience is brought to people.
When the Bluetooth shield is in the Bluetooth mode, the power is supplied mainly through the lithium battery. The current bluetooth shield generally carries out the detection of lithium cell electric quantity through electric quantity detection module, and electric quantity detection module generally comprises two or more bleeder resistor series connection. Because the battery is connected to series connection's bleeder resistor's one end, and the other end is connected ground, consequently, after the bluetooth shield was electrified, will form a return circuit between lithium cell and the bleeder resistor, like this, as long as the bluetooth shield has the electricity, will have the electric current to pass through on the bleeder resistor, also leaks the current to cause partly lithium cell electric quantity loss, reduced the rate of utilization of lithium cell electric quantity, lead to the live time of bluetooth shield to shorten.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model discloses a bluetooth device to realize when bluetooth device goes up the electric back, if electric quantity detection module does not work, can not form the return circuit between battery module and each divider resistance, thereby not have the electric current to pass through on the divider resistance, thereby reduce the electric quantity loss that the return circuit leaks the current and causes, improve battery module's electric quantity rate of utilization, prolong bluetooth device's live time.
A bluetooth device, comprising: the safety device comprises a battery module, an electric quantity detection module, a Bluetooth module and a safety module, wherein the battery module is respectively connected with the electric quantity detection module, the Bluetooth module and the safety module, and the electric quantity detection module is connected with the safety module through the Bluetooth module;
the electric quantity detection module comprises: change over switch module and a plurality of bleeder resistor, change over switch module and a plurality of bleeder resistor series connection, change over switch module is used for the electric quantity detection module detects during the electric quantity of battery module, switch on by a plurality of the partial pressure branch road that bleeder resistor formed electric quantity detection module stops to detect during the electric quantity of battery module, turn-off the partial pressure branch road.
Optionally, when the change-over switch module is a switch tube, the electric quantity detection module specifically includes: the first voltage-dividing resistor, the second voltage-dividing resistor and the first switch tube;
the control end of the first switch tube is used as the control end of the electric quantity detection module and is connected with the signal output end of the Bluetooth module, the input end of the first switch tube is connected with the output end of the battery module through the first divider resistor, the output end of the first switch tube is grounded through the second divider resistor, the common end of the first switch tube and the second divider resistor is used as the output end of the electric quantity detection module and is connected with the signal acquisition end of the Bluetooth module, the Bluetooth module is used for outputting a conducting signal to the first switch tube when the electric quantity detection module detects the electric quantity of the battery module, and outputting a turn-off signal to the first switch tube when the electric quantity detection module stops detecting the electric quantity of the battery module.
Optionally, the electric quantity detection module further includes: the circuit comprises a first current limiting resistor, a second current limiting resistor and a first capacitor;
the control end of the first switch tube is connected with one end of the first current-limiting resistor, and the other end of the first current-limiting resistor is used as the control end of the electric quantity detection module;
one end of the second current limiting resistor is connected with the common end of the first switching tube and the first current limiting resistor, and the other end of the second current limiting resistor is grounded;
the first capacitor is connected in parallel with two ends of the second voltage-dividing resistor and is used for filtering the signal output by the electric quantity detection module.
Optionally, when the change-over switch module is a switch tube, the electric quantity detection module specifically includes: the third voltage dividing resistor, the fourth voltage dividing resistor, the second switching tube and the third switching tube;
the input end of the second switch tube is connected with the output end of the battery module, the output end of the second switch tube is grounded through the third voltage dividing resistor and the fourth voltage dividing resistor which are sequentially connected in series, and the common end of the third voltage dividing resistor and the fourth voltage dividing resistor is used as the output end of the electric quantity detection module to be connected with the signal acquisition end of the Bluetooth module;
the control end of the second switching tube is connected with the input end of the third switching tube, the control end of the third switching tube is used as the control end of the electric quantity detection module and is connected with the signal output end of the Bluetooth module, and the output end of the third switching tube is grounded;
the bluetooth module is configured to output a conduction signal to the third switch tube to turn on the third switch tube when the electric quantity detection module detects the electric quantity of the battery module, so as to turn on the second switch tube, and turn on a loop formed by the second switch tube, the third voltage dividing resistor, and the fourth voltage dividing resistor; the Bluetooth module is used for outputting a turn-off signal to the third switch tube to turn off the third switch tube when the electric quantity detection module stops detecting the electric quantity of the battery module, so that the second switch tube is turned off, and a loop formed by the second switch tube, the third voltage dividing resistor and the fourth voltage dividing resistor is turned off.
Optionally, the electric quantity detection module further includes: the first current limiting resistor is connected with the first capacitor;
one end of the third current limiting resistor is connected with the output end of the battery module, and the other end of the third current limiting resistor is connected with the common ends of the second switching tube and the third switching tube;
one end of the fourth current-limiting resistor is connected with the input end of the second switching tube, and the other end of the fourth current-limiting resistor is grounded;
the third switching tube is grounded through the fifth current-limiting resistor;
and the second capacitor is connected in parallel with two ends of the fourth voltage-dividing resistor and is used for filtering the signal output by the electric quantity detection module.
Optionally, the bluetooth device further includes: the current detection module is respectively connected with the battery module and the Bluetooth module;
the current detection module includes: the current detection resistor, the feedback resistor, the sixth current limiting resistor and the operational amplifier;
the current detection resistor is connected in series with an output loop of the battery module;
one end of the sixth current limiting resistor is connected with the current detection resistor and the common end of the battery module, and the other end of the sixth current limiting resistor is connected with the inverting input end of the operational amplifier.
One end of the feedback resistor is connected with the output end of the operational amplifier, the other end of the feedback resistor is connected with the inverting input end of the operational amplifier, and the common end of the feedback resistor and the output end of the operational amplifier is used as the output end of the current detection module and is connected with the signal acquisition end of the Bluetooth module;
the output end of the current detection module is used for outputting the real-time voltages at two ends of the current detection resistor to the Bluetooth module, so that the Bluetooth module determines whether the voltage detected by the electric quantity detection module is the actual electric quantity of the battery module based on the variation amplitude of the real-time voltages.
Optionally, the current detection module further includes: a seventh current limiting resistor;
one end of the seventh current limiting resistor is connected with one end, far away from the battery module, of the current detection resistor, and the other end of the seventh current limiting resistor is connected with the non-inverting input end of the operational amplifier.
Optionally, the current detection module further includes: an eighth current limiting resistor, a third capacitor and a fourth capacitor;
one end of the eighth current limiting resistor is connected with the feedback resistor and the common end of the output end of the operational amplifier, and the other end of the eighth current limiting resistor is used as the output end of the current detection module and is connected with the signal acquisition end of the Bluetooth module;
one end of the third capacitor is connected with a positive power supply of the operational amplifier, and the other end of the third capacitor is grounded;
one end of the fourth capacitor is connected with one end, far away from the operational amplifier, of the eighth current limiting resistor, and the other end of the fourth capacitor is connected with a negative power supply of the operational amplifier.
Optionally, the data transmission pins of the serial port channels of the bluetooth module and the security module are connected with a universal input/output port supporting external on-off, and when the bluetooth device executes the wakeup operation, the bluetooth module sends information data to the security module and triggers the universal input/output port with on-off function connected to the serial port channel, so that the security module determines that the bluetooth device enters a working state from a sleep state based on the change of the universal input/output port.
Optionally, the switch module is a switch circuit.
According to the above technical scheme, the utility model discloses a bluetooth device, through increase the change over switch module in electric quantity detection module, this change over switch module can be when electric quantity detection module detects battery module's electric quantity, switch on the partial pressure branch road that is formed by a plurality of bleeder resistors, when electric quantity detection module stops to detect battery module's electric quantity, turn-off the partial pressure branch road, make when bluetooth device power-on after, if electric quantity detection module does not work, can not form the return circuit between battery module and each bleeder resistor, thereby not have the electric current to pass through on the bleeder resistor, thereby the electric quantity loss that the return circuit leakage current caused has been reduced, battery module's electric quantity rate of utilization has been improved, bluetooth device's live time has been prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the disclosed drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a bluetooth device disclosed in an embodiment of the present invention;
fig. 2 is a circuit diagram of an electric quantity detection module disclosed in the embodiment of the present invention;
fig. 3 is a circuit diagram of another power detection module according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another bluetooth device disclosed in the embodiment of the present invention;
fig. 5 is a circuit diagram of a current detection module according to an embodiment of the present invention;
fig. 6 is an interaction diagram of a bluetooth module and a security module according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The embodiment of the utility model discloses bluetooth equipment, through increasing the change over switch module in electric quantity detection module, this change over switch module can be when electric quantity detection module detects battery module's electric quantity, switch on the partial pressure branch road that is formed by a plurality of divider resistance, when electric quantity detection module stops to detect battery module's electric quantity, turn-off the partial pressure branch road, make after the bluetooth equipment goes up, if electric quantity detection module does not work, can not form the return circuit between battery module and each divider resistance, thereby not have the electric current to pass through on the divider resistance, thereby the electric quantity loss that the return circuit leakage current caused has been reduced, the electric quantity rate of utilization of battery module has been improved, the live time of bluetooth equipment has been prolonged.
Referring to fig. 1, an embodiment of the present invention discloses a bluetooth device's structural diagram, bluetooth device includes: the system comprises a battery module 11, an electric quantity detection module 12, a Bluetooth module 13 and a safety module 14;
wherein:
the battery module 11 is respectively connected with the electric quantity detection module 12, the Bluetooth module 13 and the safety module 14, and the electric quantity detection module 12 is connected with the safety module 14 through the Bluetooth module 13.
Specifically, the electric quantity detection module 12 includes: change over switch module and a plurality of divider resistance, change over switch module and a plurality of divider resistance series connection, the change over switch module is used for electric quantity detection module 12 detects during the electric quantity of battery module 11, switch on by a plurality of the partial pressure branch road that divider resistance formed electric quantity detection module 12 stops to detect during the electric quantity of battery module 11, turn-off the partial pressure branch road.
In conclusion, the utility model discloses a bluetooth device, through increase the change over switch module in electric quantity detection module 12, this change over switch module can be when electric quantity detection module 12 detects battery module 11's electric quantity, switch on the partial pressure branch road that is formed by a plurality of divider resistance, when electric quantity detection module 12 stops to detect battery module 11's electric quantity, turn off the partial pressure branch road, make after bluetooth device is gone up the electricity, if electric quantity detection module 12 does not work, can not form the return circuit between battery module 11 and each divider resistance, thereby not have the electric current to pass through on the divider resistance, thereby the electric quantity loss that the return circuit leakage current caused has been reduced, the electric quantity rate of utilization of battery module 11 has been improved, bluetooth device's live time has been prolonged.
Optionally, the change-over switch module may be a switch tube, and specifically may be an NMOS tube, a PMOS tube, a PNP tube, or an NPN tube. Because the internal resistance of the switch tube is very small, the loss of the switch tube is very little when the switch tube is switched on, so that the low power consumption of the Bluetooth device during the electric quantity measurement can be realized, and the electric quantity loss caused by the switching on of a loop formed by the divider resistor when the electric quantity detection module 12 is in an idle state can be effectively prevented.
Referring to fig. 2, in an embodiment of the present invention, a circuit diagram of a power detection module is disclosed, the power detection module 12 may include: the first voltage-dividing resistor R1, the second voltage-dividing resistor R2 and the first switch tube Q1;
the control terminal of the first switch tube Q1 is connected to the signal output terminal of the bluetooth module 13 as the control terminal BAT _ ON of the electric quantity detection module 12, the input end of the first switching tube Q1 is connected to the output end V _ Battery of the Battery module 11 through the first voltage-dividing resistor R1, the output end of the first switch tube Q1 is grounded through a second voltage-dividing resistor R2, the common end of the first switch tube Q1 and the second voltage-dividing resistor R2 is used as the output end of the electric quantity detection module 12 and is connected with the signal acquisition terminal BAT _ DET of the bluetooth module 13, the bluetooth module 13 is configured to output a conducting signal to the first switch tube Q1 when the electric quantity detection module 12 detects the electric quantity of the battery module 11, when the power detection module 12 stops detecting the power of the battery module 11, it outputs a turn-off signal to the first switching tube Q1.
It should be noted that the signal acquisition terminal BAT _ DET of the bluetooth module 13 is connected to the analog-to-digital conversion channel of the bluetooth module 13.
Optionally, the first switching transistor Q1 is an NMOS transistor.
To further optimize the embodiment shown in fig. 2, the power detecting module 12 may further include: the circuit comprises a first current limiting resistor R3, a second current limiting resistor R4 and a first capacitor C1;
a control end of the first switching tube Q1 is connected to one end of the first current limiting resistor R3, and the other end of the first current limiting resistor R3 is used as a control end BAT _ ON of the power detection module 12;
one end of the second current limiting resistor R4 is connected with the common end of the first switch tube Q1 and the first current limiting resistor R3, and the other end of the second current limiting resistor R4 is grounded;
the first capacitor C1 is connected in parallel to two ends of the second voltage-dividing resistor R2, and is configured to filter the signal output by the power detection module 12.
Optionally, referring to fig. 3, in a circuit diagram of a power detection module disclosed in another embodiment of the present invention, the power detection module 12 may include: the third voltage dividing resistor R5, the fourth voltage dividing resistor R6, the second switch tube Q2 and the third switch tube Q3;
the input end of the second switch tube Q2 is connected to the output end V _ Battery of the Battery module 11, the output end of the second switch tube Q2 is grounded through the third voltage-dividing resistor R5 and the fourth voltage-dividing resistor R6 which are sequentially connected in series, and the common end of the third voltage-dividing resistor R5 and the fourth voltage-dividing resistor R6 is used as the output end of the electric quantity detection module 12 and is connected to the signal acquisition terminal BAT _ DET of the bluetooth module 13;
the control end of the second switch tube Q2 is connected to the input end of the third switch tube Q3, the control end of the third switch tube Q3 is used as the control end BAT _ ON of the electric quantity detection module 12 to be connected to the signal output end of the bluetooth module 13, and the output end of the third switch tube Q3 is grounded.
The bluetooth module 13 is configured to output a conducting signal to the third switching tube Q3 to conduct the third switching tube Q3 and further conduct the second switching tube Q2 when the electric quantity detection module 12 detects the electric quantity of the battery module 11, so that a loop formed by the second switching tube Q2, the third voltage-dividing resistor R5 and the fourth voltage-dividing resistor R6 is conducted to realize electric quantity acquisition of the battery module 11 by the electric quantity detection module 12; the bluetooth module 13 is configured to output a turn-off signal to the third switch tube Q3 to turn off the third switch tube Q3 when the electric quantity detection module 12 stops detecting the electric quantity of the battery module 11, and further turn off the second switch tube Q2, so that a loop formed by the second switch tube Q2, the third voltage-dividing resistor R5 and the fourth voltage-dividing resistor R6 is turned off, thereby effectively avoiding the situation of generation of leakage current in the loop when the electric quantity detection module 12 does not collect the electric quantity of the battery module 11.
It should be particularly noted that the third switching transistor Q3 may be an NMOS transistor, the second switching transistor Q2 may be a PMOS transistor, and the PMOS transistor is driven by a low level, so that the measurement loop can be formed with further reduced loss due to the fact that the on-resistance of the PMOS transistor is generally smaller than that of the NMOS transistor while the control is facilitated.
To further optimize the embodiment shown in fig. 3, the power detection module 12 may include: a third current limiting resistor R7, a fourth current limiting resistor R8, a fifth current limiting resistor R9 and a second capacitor C2;
one end of the third current limiting resistor R7 is connected to the output terminal V _ Battery of the Battery module 11, and the other end of the third current limiting resistor R7 is connected to the common terminal of the second switching tube Q2 and the third switching tube Q3;
one end of the fourth current limiting resistor R8 is connected to the input end of the second switching tube Q2, and the other end of the fourth current limiting resistor R8 is grounded;
the third switching tube Q3 is grounded through the fifth current limiting resistor R9;
the second capacitor C2 is connected in parallel to two ends of the fourth voltage-dividing resistor R6, and is configured to filter the signal output by the power detection module 12.
In conclusion, the utility model discloses an increase the switch tube in electric quantity detection module 12, this switch tube can be when electric quantity detection module 12 detects battery module 11's electric quantity, switch on the partial pressure branch road that is formed by a plurality of divider resistance, when electric quantity detection module 12 stops to detect battery module 11's electric quantity, turn-off the partial pressure branch road, make when bluetooth equipment power-on after, if electric quantity detection module 12 does not work, can not form the return circuit between battery module 11 and each divider resistance, thereby not have the electric current to pass through on the divider resistance, thereby the electric quantity loss that the return circuit leakage current caused has been reduced, the electric quantity rate of utilization of battery module 11 has been improved, the live time of bluetooth equipment has been prolonged.
In this embodiment, the bluetooth device may be a bluetooth authentication device, such as a bluetooth Key; the bluetooth device may also be a financial card with bluetooth function, a mobile terminal, or the like.
In this embodiment, the switch module may be a switch circuit; the switch circuit can be the switch tube, and the switch circuit can also be set into other elements or circuit structures with switch functions according to the actual structure and function of the Bluetooth device.
Those skilled in the art can understand that in some operating situations, for example, during a connection process of the bluetooth device with a mobile phone or other devices, liquid crystal backlight highlighting, wireless transmission and reception, signature operation, etc., a temporary large current loss occurs, so that the battery voltage is reduced quickly. When these power-hungry operations are completed, the battery voltage will rise again. When the bluetooth equipment carries out some operations that the consumption is big, can lead to bluetooth module 13 to the erroneous judgement of battery electric quantity, the electric quantity that makes bluetooth equipment's display screen show can have certain deviation with actual electric quantity to make the user mistake regard as bluetooth equipment's electric quantity to hang down.
Consequently, for avoiding in the operation that some consumptions are big, it is great because of battery voltage drop, and lead to bluetooth module 13 to the erroneous judgement problem of battery power, on showing bluetooth equipment's display screen with the electric quantity collection of relative accuracy simultaneously, the utility model of this application still makes further improvement to figure 1 bluetooth equipment.
Referring to fig. 4, the schematic structural diagram of a bluetooth device disclosed in another embodiment of the present invention, on the basis of the embodiment shown in fig. 1, the bluetooth device may further include: and the current detection module 15, wherein the current detection module 15 is respectively connected with the battery module 11 and the Bluetooth module 13.
Specifically, referring to fig. 5, an embodiment of the present invention discloses a circuit diagram of a current detection module, where the current detection module 15 includes: current detection resistor RSensorThe feedback resistor R10, the sixth current limiting resistor R11, the seventh current limiting resistor R12 and the operational amplifier U1A;
wherein:
the current detection resistor RSensorThe output circuit of the battery module 11 is connected in series, specifically: current detection resistor RSensorIs connected to the positive output terminal of the battery module 11, and a current detection resistor RSensorThe other end of the second switch is connected with the power supply end of the Bluetooth device. Therefore, as long as a current flows between the battery module 11 and the bluetooth device, the current detection resistor R will be presentSensorCreating a pressure drop. Under the normal state of the Bluetooth device, an approximately stable current flows through the current detection resistor RSensor。
One end of the sixth current limiting resistor R11 is connected with the current detection resistor RSensorAnd stationThe other end of the sixth current limiting resistor R11 is connected to the inverting input terminal of the operational amplifier U1A at the common terminal of the battery module 11.
One end of the seventh current limiting resistor R12 is connected with the current detection resistor RSensorThe other end of the seventh current limiting resistor R12, which is far from one end of the battery module 11, is connected to the non-inverting input terminal of the operational amplifier U1A.
One end of the feedback resistor R10 is connected with the output end of the operational amplifier U1A, the other end of the feedback resistor R10 is connected with the inverting input end of the operational amplifier U1A, and the common end of the feedback resistor R10 and the output end of the operational amplifier U1A is used as the output end of the current detection module and is connected with the signal acquisition terminal BAT _ DET of the Bluetooth module 13.
It should be noted that the branch in which the feedback resistor R10 is located, that is, the negative feedback circuit of the operational amplifier U1A, is used to ensure the stability of the measurement circuit. In addition, when the current is relatively small, the resistance R is detected at the currentSensorGo up the pressure drop of production also less, detect suitable voltage for better output at operational amplifier U1A, the utility model discloses an increase feedback resistance R10 and carry out voltage gain regulation and control, accessible feedback resistance R10 set for the voltage that bluetooth module 13 was gathered at operational amplifier U1A and enlarge the certain limit to make the final result that bluetooth module 13 gathered more accurate.
The output end of the current detection module is used for detecting the current detection resistor RSensorThe real-time voltages at the two ends are output to the bluetooth module 13, so that the bluetooth module 13 determines whether the voltage detected by the electric quantity detection module 12 is the actual electric quantity of the battery module 11 based on the variation amplitude of the real-time voltages, and determines that the voltage detected by the electric quantity detection module 12 is the actual electric quantity of the battery module 11 when the variation amplitude of the real-time voltages is smaller than the difference threshold value.
Specifically, a current detection resistor R is connected in series to the output circuit of the battery module 11SensorThen, as long as current flows between the battery module 11 and the bluetooth device, the current will be onCurrent detection resistor RSensorAnd a voltage drop is generated, and the voltage drop is amplified by the operational amplifier U1A and then output to the signal acquisition terminal BAT _ DET of the bluetooth module 13.
The Bluetooth device has an approximate stable current flowing through the current detection resistor R in the normal stateSensorAnd further the voltage output by the corresponding operational amplifier U1A is also an approximately stable value.
The voltage value of the steady state of the bluetooth device is output through the operational amplifier U1A of the current detection module 15 after the bluetooth device is started or awakens up stably, and is measured by the bluetooth module 13, and the current detection resistor R is used for detecting the current when the bluetooth device is in the steady stateSensorThe voltage across is denoted as a first voltage V1.
When the Bluetooth device is in operations such as transaction signature operation, wireless transmission (note: data is wirelessly transmitted and received), and the like, the power consumption of the Bluetooth device is increased, so that the current detection resistor R flowsSensorThe battery voltage drops relatively quickly due to the relatively large power consumption operation, and the current detection resistor R is used for detecting the current when the power consumption of the Bluetooth device is increasedSensorThe voltage across is denoted as a second voltage V2.
The bluetooth module 13 compares the voltage difference between the first voltage V1 and the second voltage V2, and determines the status of the bluetooth device according to the voltage difference. Specifically, when the voltage difference is smaller than the difference threshold, that is, when the first voltage V1 and the second voltage V2 are approximately equal, it indicates that the bluetooth device is in a steady state; otherwise, when the voltage difference is not less than the difference threshold, it indicates that the bluetooth device is in a state of high power consumption, and at this time, the power consumption of the bluetooth device increases and flows through the current detection resistor RSensorSo that the current of the current detecting resistor R is increasedSensorThe second voltage V2 increases, and a certain voltage difference is formed between the first voltage V1 and the second voltage V2.
When the voltage drop of the bluetooth equipment with large fluctuation occurs, the application software of the bluetooth equipment can set the current detection resistor R to be repeatedly measured for many timesSensorVoltage across until current sense resistor RSensorThe voltage at both ends tends to be stable(V2 ≈ V1). When the power consumption of the bluetooth device system tends to be stable, the battery voltage will rise, and at this time, the actual electric quantity of the battery module 11 is the electric quantity obtained by the bluetooth module 13 based on the voltage collected by the electric quantity detection module 12.
Therefore, it can be seen that when the voltage difference between the first voltage V1 and the second voltage V2 is not less than the difference threshold, it is determined that the bluetooth device is currently in a state with high power consumption, and therefore, it can be determined that the voltage currently detected by the power detection module is not the true battery voltage of the battery module, and at this time, further measurement is required until the voltage difference between the first voltage V1 and the second voltage V2 is less than the difference threshold, so as to obtain an accurate battery power. Otherwise, if the voltage measured when the bluetooth device is in a state of large power consumption is fed back to the user in an electric quantity form, interference will be caused, and the user may mistakenly assume that the bluetooth device is low in electric quantity.
In conclusion, the utility model discloses increased a current detection module 15 in bluetooth equipment, current detection resistance R when bluetooth equipment is in steady stateSensorThe first voltage across is stable, whereas the current sense resistor R is used when the bluetooth device is under power consumption increaseSensorThe second voltage at both ends is increased, so the bluetooth module 13 can determine the current state of the bluetooth device by comparing the voltage difference between the first voltage V1 and the second voltage V2 and comparing the voltage difference with the difference threshold, and only when the voltage difference is smaller than the difference threshold, the voltage detected by the power detection module 12 is determined to be the actual power of the battery module 11. Therefore, the utility model discloses effectively avoided when bluetooth equipment carries out the operation that some consumptions are big, lead to bluetooth module 13 to the erroneous judgement of battery power, the electric quantity that makes bluetooth equipment's display screen show can have certain deviation with actual electric quantity to make the user mistake consider the appearance of the electric quantity condition that bluetooth equipment is low excessively.
To further optimize the above embodiment, the current detection module 15 may further include: an eighth current limiting resistor R13, a third capacitor C3 and a fourth capacitor C4;
one end of the eighth current limiting resistor R13 is connected to the common end of the output ends of the feedback resistor R10 and the operational amplifier U1A, and the other end of the eighth current limiting resistor R13 is used as the output end of the current detection module and is connected to the signal acquisition terminal BAT _ DET of the bluetooth module 13;
one end of the third capacitor C3 is connected with a positive power supply V33 of the operational amplifier U1A, and the other end of the third capacitor C3 is grounded, wherein the positive power supply V33 is an indicator for providing 3.3V voltage;
one end of the fourth capacitor C4 is connected to one end of the eighth current limiting resistor R13, which is far from the operational amplifier U1A, and the other end of the fourth capacitor C4 is connected to the negative power supply of the operational amplifier U1A.
In the above embodiment, in order to correctly determine whether the bluetooth device enters the working state from the sleep state, referring to fig. 6, an interactive schematic diagram of the bluetooth module and the security module is disclosed in an embodiment of the present invention, the present invention further includes that a data transmission pin of the serial port channel of the bluetooth module 13 and the security module, i.e. a TX pin in fig. 6, is connected with a GPIO (General-purpose input/output) supporting external on/off, when the bluetooth device executes the wakeup operation, the bluetooth module 13 will transmit information data to the security module 14, and at this time, trigger a GPIO interface with on/off function connected to the serial port channel, i.e. an EXIT _ GPIO in fig. 6, the security module 14 can detect the state change of the bluetooth device based on the change of the EXIT _ GPIO, further process the interrupt event, and determine that the bluetooth device has woken up from the sleep state, and entering a normal working state, thereby avoiding the situation that the electric quantity of the battery is reduced due to the long-time startup of the user and causing the Bluetooth module 13 to have misjudgment.
In addition, the situation that the user is started is the process from power-off to power-on of the Bluetooth device, so that whether the Bluetooth device is in a power-off state or a normal working state can be determined according to the electric quantity detected by the electric quantity detection module.
In the above embodiment, when the bluetooth device is powered on or awakens from the sleep state, the switch module of the electric quantity detection module 12 is controlled to be in the on state, and after the bluetooth device is stable, the electric quantity of the battery module 11 detected by the electric quantity detection module 12 is determined as the initial electric quantity of the bluetooth device, and at this time, the bluetooth device is controlled to display the initial electric quantity in an electric quantity icon manner. To reduce the power consumption of the battery module 11, the switch module of the power detection module 12 is controlled to be in an off state. The measurement of the electrical quantity is divided into two cases:
case one, if the user turns on only the bluetooth device without using the bluetooth device for activities such as transactions, in this case, when it is determined that the detected current detection resistance R is detectedSensorWhen the voltages at the two ends tend to be stable, the voltage detected by the current detection module 15 is processed by the bluetooth module 13, and the processed voltage is displayed on the electric quantity prompt box of the bluetooth device.
In the second situation, when the bluetooth device is turned on by the user, the bluetooth device is immediately used for transaction operation, because the operations such as signature involve a large amount of calculation, the power consumption of the system is correspondingly increased, at this time, the current of the current detection circuit (i.e., the circuit in the current detection module 15) is correspondingly increased, and because the bluetooth device cannot determine when the user finishes the operation, the current detection circuit needs to monitor the power consumption change of the bluetooth device in real time, and the bluetooth module 13 acquires the current detection resistor RSensorThe voltage across the resistor is compared with a reference voltage (i.e., the first voltage V1 mentioned above) when the current detection resistor R detects the currentSensorWhen the voltages at the two ends are approximately equal to the reference voltage, the user is determined to finish the operation, and the Bluetooth device is recovered to a stable no-operation state. At this time, a flag bit is set in the bluetooth module 13 (note: adc _ bat _ flag is a variable set by software, initialized to zero and used for determining whether the bluetooth device is in a steady state in a current detection loop, if not operated, adc _ bat _ flag is always equal to zero, if the bluetooth device is restored to the steady state after being used by a user, the measured variable adc _ bat _ flag is set to 1, and the change is fed back to the power detection circuit, the battery voltage value at the moment is collected and used for determining the power, the battery voltage value at the moment is collected, and the battery voltage value is fed back to a display screen of the bluetooth device through a power icon, so that the situation that the power collection is still carried out due to the voltage reduction of the bluetooth device in the using process is avoided, and the power collection is still carried outThe problem of error in the display result caused by the fact that the display result is carried out is solved, so that a user can know the electric quantity information of the Bluetooth device more accurately, and meanwhile, the control on the power consumption of the product is improved.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A bluetooth device, comprising: the safety device comprises a battery module, an electric quantity detection module, a Bluetooth module and a safety module, wherein the battery module is respectively connected with the electric quantity detection module, the Bluetooth module and the safety module, and the electric quantity detection module is connected with the safety module through the Bluetooth module;
the electric quantity detection module comprises: change over switch module and a plurality of bleeder resistor, change over switch module and a plurality of bleeder resistor series connection, change over switch module is used for the electric quantity detection module detects during the electric quantity of battery module, switch on by a plurality of the partial pressure branch road that bleeder resistor formed electric quantity detection module stops to detect during the electric quantity of battery module, turn-off the partial pressure branch road.
2. The bluetooth device according to claim 1, wherein when the switch module is a switch tube, the power detection module specifically comprises: the first voltage-dividing resistor, the second voltage-dividing resistor and the first switch tube;
the control end of the first switch tube is used as the control end of the electric quantity detection module and is connected with the signal output end of the Bluetooth module, the input end of the first switch tube is connected with the output end of the battery module through the first divider resistor, the output end of the first switch tube is grounded through the second divider resistor, the common end of the first switch tube and the second divider resistor is used as the output end of the electric quantity detection module and is connected with the signal acquisition end of the Bluetooth module, the Bluetooth module is used for outputting a conducting signal to the first switch tube when the electric quantity detection module detects the electric quantity of the battery module, and outputting a turn-off signal to the first switch tube when the electric quantity detection module stops detecting the electric quantity of the battery module.
3. The bluetooth device of claim 2, wherein the power detection module further comprises: the circuit comprises a first current limiting resistor, a second current limiting resistor and a first capacitor;
the control end of the first switch tube is connected with one end of the first current-limiting resistor, and the other end of the first current-limiting resistor is used as the control end of the electric quantity detection module;
one end of the second current limiting resistor is connected with the common end of the first switching tube and the first current limiting resistor, and the other end of the second current limiting resistor is grounded;
the first capacitor is connected in parallel with two ends of the second voltage-dividing resistor and is used for filtering the signal output by the electric quantity detection module.
4. The bluetooth device according to claim 1, wherein when the switch module is a switch tube, the power detection module specifically comprises: the third voltage dividing resistor, the fourth voltage dividing resistor, the second switching tube and the third switching tube;
the input end of the second switch tube is connected with the output end of the battery module, the output end of the second switch tube is grounded through the third voltage dividing resistor and the fourth voltage dividing resistor which are sequentially connected in series, and the common end of the third voltage dividing resistor and the fourth voltage dividing resistor is used as the output end of the electric quantity detection module to be connected with the signal acquisition end of the Bluetooth module;
the control end of the second switching tube is connected with the input end of the third switching tube, the control end of the third switching tube is used as the control end of the electric quantity detection module and is connected with the signal output end of the Bluetooth module, and the output end of the third switching tube is grounded;
the bluetooth module is configured to output a conduction signal to the third switch tube to turn on the third switch tube when the electric quantity detection module detects the electric quantity of the battery module, so as to turn on the second switch tube, and turn on a loop formed by the second switch tube, the third voltage dividing resistor, and the fourth voltage dividing resistor; the Bluetooth module is used for outputting a turn-off signal to the third switch tube to turn off the third switch tube when the electric quantity detection module stops detecting the electric quantity of the battery module, so that the second switch tube is turned off, and a loop formed by the second switch tube, the third voltage dividing resistor and the fourth voltage dividing resistor is turned off.
5. The bluetooth device of claim 4, wherein the power detection module further comprises: the first current limiting resistor is connected with the first capacitor;
one end of the third current limiting resistor is connected with the output end of the battery module, and the other end of the third current limiting resistor is connected with the common ends of the second switching tube and the third switching tube;
one end of the fourth current-limiting resistor is connected with the input end of the second switching tube, and the other end of the fourth current-limiting resistor is grounded;
the third switching tube is grounded through the fifth current-limiting resistor;
and the second capacitor is connected in parallel with two ends of the fourth voltage-dividing resistor and is used for filtering the signal output by the electric quantity detection module.
6. The bluetooth device according to claim 1, characterized in that the bluetooth device further comprises: the current detection module is respectively connected with the battery module and the Bluetooth module;
the current detection module includes: the current detection resistor, the feedback resistor, the sixth current limiting resistor and the operational amplifier;
the current detection resistor is connected in series with an output loop of the battery module;
one end of the sixth current limiting resistor is connected with the current detection resistor and the common end of the battery module, and the other end of the sixth current limiting resistor is connected with the inverting input end of the operational amplifier;
one end of the feedback resistor is connected with the output end of the operational amplifier, the other end of the feedback resistor is connected with the inverting input end of the operational amplifier, and the common end of the feedback resistor and the output end of the operational amplifier is used as the output end of the current detection module and is connected with the signal acquisition end of the Bluetooth module;
the output end of the current detection module is used for outputting the real-time voltages at two ends of the current detection resistor to the Bluetooth module, so that the Bluetooth module determines whether the voltage detected by the electric quantity detection module is the actual electric quantity of the battery module based on the variation amplitude of the real-time voltages.
7. The bluetooth device according to claim 6, wherein the current detection module further comprises: a seventh current limiting resistor;
one end of the seventh current limiting resistor is connected with one end, far away from the battery module, of the current detection resistor, and the other end of the seventh current limiting resistor is connected with the non-inverting input end of the operational amplifier.
8. The bluetooth device according to claim 6 or 7, wherein the current detection module further comprises: an eighth current limiting resistor, a third capacitor and a fourth capacitor;
one end of the eighth current limiting resistor is connected with the feedback resistor and the common end of the output end of the operational amplifier, and the other end of the eighth current limiting resistor is used as the output end of the current detection module and is connected with the signal acquisition end of the Bluetooth module;
one end of the third capacitor is connected with a positive power supply of the operational amplifier, and the other end of the third capacitor is grounded;
one end of the fourth capacitor is connected with one end, far away from the operational amplifier, of the eighth current limiting resistor, and the other end of the fourth capacitor is connected with a negative power supply of the operational amplifier.
9. The bluetooth device according to claim 1, wherein the data transmission pins of the serial port channels of the bluetooth module and the security module are connected to a general input/output port supporting external on/off, and when the bluetooth device executes a wake-up operation, the bluetooth module transmits information data to the security module and triggers the general input/output port with on/off function connected to the serial port channel, so that the security module determines that the bluetooth device has entered a working state from a sleep state based on a change of the general input/output port.
10. The bluetooth device according to claim 1, wherein the change-over switch module is a switch circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920517213.XU CN210072020U (en) | 2019-04-16 | 2019-04-16 | Bluetooth device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920517213.XU CN210072020U (en) | 2019-04-16 | 2019-04-16 | Bluetooth device |
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| CN210072020U true CN210072020U (en) | 2020-02-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113064088A (en) * | 2021-03-16 | 2021-07-02 | 中磊电子（苏州）有限公司 | Internet of things device and battery power detection method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113064088A (en) * | 2021-03-16 | 2021-07-02 | 中磊电子（苏州）有限公司 | Internet of things device and battery power detection method |
| CN113064088B (en) * | 2021-03-16 | 2024-03-22 | 中磊电子（苏州）有限公司 | Internet of things device and battery electric quantity detection method |
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