Battery electric quantity detection display circuit

Abstract

The utility model relates to the field of battery electric quantity detection, and discloses a battery electric quantity detection display circuit. The battery electric quantity detection display circuit comprises a key, a key detection circuit, an electric quantity detection circuit, a driving circuit and a display module, the key detection circuit is electrically connected with the battery, the key and the display module and used for detecting whether the key is pressed down or not and outputting a control signal to the display module when it is detected that the key is pressed down. The electric quantity detection circuit is electrically connected with the battery and the driving circuit, and is used for dividing the voltage of the battery to form a plurality of proportional partial voltages, comparing the plurality of proportional partial voltages with a reference voltage, and outputting a driving signal to the driving circuit according to a comparison result; the driving circuit is electrically connected with the display module and used for driving the display module to display according to the driving signal output by the electric quantity detection circuit. Therefore, the battery capacity is displayed through the manual key, the delay automatic extinguishing is realized, the method is simple and efficient, pure hardware control is realized, software control is not needed, the performance is reliable, and the cost is low.

Description

Technical Field

[0001] The utility model relates to the field of battery power detection, in particular to a battery power detection and display circuit. Background Technique

[0002] Currently, there are more and more electronic products powered by batteries in the market, and the functional requirements for battery power detection also show various forms.

[0003] At present, the detection of battery power generally samples the battery voltage, and after conversion by an ADC (Analog to Digital Converter), the software reads and calculates to obtain the battery power parameters. This scheme has a high accuracy in obtaining the battery voltage parameters, but it requires corresponding software debugging, increasing the project workload and development cycle, with complex development, and the connection is complex when wiring the PCB (Printed Circuit Board), with high requirements for wiring, high production costs, and the ADC sampling circuit is prone to interference during operation, resulting in data errors. Summary of the Utility Model

[0004] The embodiment of the utility model aims to provide a battery power detection and display circuit, which can solve the problems of complex development and high production costs caused by software debugging during battery power detection.

[0005] To solve the above technical problems, the embodiment of the utility model provides a battery power detection and display circuit, including: a key, a key detection circuit, a power detection circuit, a driving circuit, and a display module; wherein:

[0006] The key detection circuit is electrically connected to the battery, the key, and the display module respectively, and is used to detect whether the key is pressed, and when it detects that the key is pressed, it outputs a control signal to the display module;

[0007] The power detection circuit is electrically connected to the battery and the driving circuit respectively, and is used to divide the battery voltage to form multiple proportional voltage divisions, compare the multiple proportional voltage divisions with a reference voltage, and output a driving signal to the driving circuit;

[0008] The driving circuit is electrically connected to the display module, and is used to drive the display module according to the driving signal, so that the display module displays under the action of the control signal and the driving signal.

[0009] Optionally, the key detection circuit includes a PMOS transistor, a first resistor, and a first capacitor; wherein:

[0010] The first end of the first resistor is electrically connected to the positive electrode of the battery, and the second end is electrically connected to the first end of the first capacitor. The second end of the first capacitor is grounded;

[0011] The gate of the PMOS transistor is electrically connected to the connection end of the second end of the first resistor and the first end of the first capacitor. The source is electrically connected to the positive electrode of the battery, and the drain is electrically connected to the input end of the display module as the output end.

[0012] Optionally, the button is connected in parallel with the first capacitor. The first end of the button is electrically connected to the first end of the first capacitor and the gate of the PMOS transistor at the same time, and the second end is electrically connected to the second end of the first capacitor and then grounded.

[0013] Optionally, the battery power detection and display circuit further includes a voltage stabilizing circuit, and the voltage stabilizing circuit is electrically connected to the output end of the button detection circuit.

[0014] Optionally, the voltage stabilizing circuit includes a first diode. The positive electrode of the first diode is electrically connected to the external power supply terminal, and the negative electrode is electrically connected to the drain of the PMOS transistor.

[0015] Optionally, the power detection circuit includes a plurality of power detection sub-circuits; among them:

[0016] The power detection sub-circuit includes a proportional voltage division circuit and a comparison circuit. Among them: the proportional voltage division circuit includes a first voltage division resistor and a second voltage division resistor connected in series. The first end of the first voltage division resistor is electrically connected to the positive electrode of the battery, and the second end is serially connected to the first end of the second voltage division resistor. The second end of the second voltage division resistor is grounded. The series connection end of the second end of the first voltage division resistor and the first end of the second voltage division resistor is used as the voltage division end of the proportional voltage division circuit to output proportional voltage division;

[0017] The comparison circuit includes a comparator. The positive input terminal of the comparator is electrically connected to the voltage division end of the proportional voltage division circuit, the negative input terminal is electrically connected to the reference voltage output terminal, and the output terminal is electrically connected to the input end of the drive circuit.

[0018] Optionally, the drive circuit includes a plurality of drive sub-circuits. The number of the drive sub-circuits matches the number of the power detection sub-circuits. One drive sub-circuit is electrically connected to one power detection sub-circuit.

[0019] Optionally, the drive sub-circuit includes a triode. The base of the triode is electrically connected to the output end of the comparator, the emitter is grounded, and the collector is electrically connected to the display module.

[0020] Optionally, the display module includes a plurality of display sub-modules, the number of the display sub-modules matching the number of the driving sub-circuits, and one display sub-module is electrically connected to one driving sub-circuit.

[0021] Optionally, the display sub-module is a light-emitting diode, a first end of the light-emitting diode being electrically connected to a drain of the PMOS transistor, and a second end being electrically connected to a collector of the triode.

[0022] Compared with the prior art, the present invention provides a battery power detection and display circuit, which includes a button, a button detection circuit, a power detection circuit, a driving circuit, and a display module; wherein: the button detection circuit is electrically connected to the battery, the button, and the display module respectively, and is configured to detect whether the button is pressed, and when it detects that the button is pressed, output a control signal to the display module; the power detection circuit is electrically connected to the battery and the driving circuit respectively, and is configured to divide the battery voltage to form a plurality of proportional voltage divisions, compare the plurality of proportional voltage divisions with a reference voltage, and output a driving signal to the driving circuit according to a comparison result; the driving circuit is electrically connected to the display module, and is configured to drive the display module according to the driving signal output by the power detection circuit, so that the display module displays under the action of the control signal and the driving signal. Thus, through the battery power detection and display circuit, the battery power can be manually button-displayed and automatically extinguished after a delay, which is simple and efficient, purely hardware-controlled, without software control, the system works stably and reliably, has reliable performance, low cost, is easy to implement, and can solve the problems of complex development and high production cost caused by software debugging in current battery power detection in low-cost and low-precision products. Description of the Drawings

[0023] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplary illustrations do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, unless otherwise stated, and the drawings in the figures do not constitute a proportional limitation.

[0024] Figure 1 is a schematic structural diagram of a battery power detection and display circuit provided by the present invention;

[0025] Figure 2 is another schematic structural diagram of a battery power detection and display circuit provided by the present invention;

[0026] Figure 3 is a schematic circuit diagram of a battery power detection and display circuit provided by the present invention;

[0027] Figure 4 is another schematic circuit diagram of a battery power detection and display circuit provided by the present invention.

[0028] Description of main component symbols:

[0029] Button detection circuit 11 Voltage stabilization circuit 12

[0030] Power detection circuit 13 Driver circuit 14

[0031] Display module 15 PMOS transistor Q5

[0032] First resistor R1 First capacitor C1

[0033] First diode D1 Button SW1

[0034] First voltage-dividing resistor R30 Second voltage-dividing resistor R40

[0035] First power detection sub-circuit 13A Second power detection sub-circuit 13B

[0036] Third power detection sub-circuit 13C Fourth power detection sub-circuit 13D

[0037] Third resistor R3 Fourth resistor R4

[0038] First comparator U2A Fifth resistor R5

[0039] Sixth resistor R6 Second comparator U2B

[0040] Seventh resistor R7 Eighth resistor R8

[0041] Third comparator U2C Ninth resistor R9

[0042] Tenth resistor R10 Fourth comparator U2D

[0043] First driver sub-circuit 14A Second driver sub-circuit 14B

[0044] Third driver sub-circuit 14C Fourth driver sub-circuit 14D

[0045] First triode Q1 Second triode Q2

[0046] Third triode Q3 Fourth triode Q4

[0047] First display sub-module 15A Second display sub-module 15B

[0048] Third display sub-module 15C Fourth display sub-module 15D Specific implementation method

[0049] For the convenience of understanding the present utility model, the present utility model will be described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or there can be one or more intermediate elements therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element, or there can be one or more intermediate elements therebetween. The terms "upper", "lower", "inner", "outer", "bottom", etc. used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0050] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in this specification in the description of the present utility model are only for the purpose of describing specific embodiments and are not used to limit the present utility model. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0051] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0052] In one embodiment, as Figure 1 shown, the present utility model provides a battery power detection and display circuit 10, and the battery power detection and display circuit 10 includes: a key SW1, a key detection circuit 11, a power detection circuit 13, a driving circuit 14, and a display module 15; wherein:

[0053] The key detection circuit 11 is electrically connected to the battery VCC, the key SW1, and the display module 15 respectively, and is used for detecting whether the key SW1 is pressed, and when it is detected that the key SW1 is pressed, outputting a control signal to the display module 15;

[0054] The power detection circuit 13 is electrically connected to the battery VCC and the driving circuit 14 respectively, and is used for dividing the battery voltage to form a plurality of proportional voltage divisions, comparing the plurality of proportional voltage divisions with a reference voltage, and outputting a driving signal to the driving circuit 14 according to the comparison result;

[0055] The driving circuit 14 is electrically connected to the display module 15 and is used to drive the display module 15 according to the driving signal output by the power detection circuit 13, so that the display module 15 displays under the action of the control signal and the driving signal.

[0056] In this embodiment, by providing a battery power detection and display circuit, including a button, a button detection circuit, a power detection circuit, a driving circuit and a display module; wherein: the button detection circuit is electrically connected to the battery, the button and the display module respectively, and is used to detect whether the button is pressed, and when it detects that the button is pressed, output a control signal to the display module; the power detection circuit is electrically connected to the battery and the driving circuit respectively, and is used to divide the battery voltage to form a plurality of proportional voltage divisions, compare the plurality of proportional voltage divisions with a reference voltage, and output a driving signal to the driving circuit according to the comparison result; the driving circuit is electrically connected to the display module, and is used to drive the display module according to the driving signal output by the power detection circuit, so that the display module displays under the action of the control signal and the driving signal. Thus, through the battery power detection and display circuit, manually pressing the button to display the battery power, and automatically extinguishing after a delay, which is simple and efficient, purely hardware controlled, without software control, the system works stably and reliably, with reliable performance, low cost, easy to implement, and can solve the problem that software debugging is required during battery power detection in low-cost and low-precision products, resulting in complex development and high production costs.

[0057] In one embodiment, the button detection circuit 11 is electrically connected to the battery VCC, the button SW1 and the display module 15 respectively, and is used to detect whether the button SW1 is pressed, and when it detects that the button SW1 is pressed, output a control signal to the display module 15.

[0058] Specifically, as Figure 3 shown, the button detection circuit includes: a PMOS transistor Q5, a first resistor R1 and a first capacitor C1; wherein:

[0059] The first end of the first resistor R1 is electrically connected to the positive electrode of the battery VCC, and the second end is electrically connected to the first end of the first capacitor C1, and the second end of the first capacitor C1 is grounded.

[0060] The gate of the PMOS transistor Q5 is electrically connected to the connection end of the second end of the first resistor R1 and the first end of the first capacitor C1, the source is electrically connected to the positive electrode of the battery, and the drain is used as the output end and is electrically connected to the input end of the display module through a second resistor R2 to control the input end of the display module.

[0061] The button SW1 is connected in parallel with the first capacitor C1. The first end of the button SW1 is simultaneously electrically connected to the first end of the first capacitor C1 and the gate of the PMOS transistor Q5, and the second end is electrically connected to the second end of the first capacitor C1 and then grounded.

[0062] The button SW1 is a normally open elastic button. In the initial state, it is generally in the normally open state. When a force is applied to press the button SW1, the circuit connected to the button SW1 is turned on; when the force pressing the button SW1 is released, it returns to the initial state under the action of the internal elastic force of the button SW1, and the circuit connected to the button SW1 is disconnected.

[0063] When the battery VCC is connected, the battery VCC charges the first capacitor C1 through the first resistor R1. At this time, the gate voltage of the PMOS transistor Q5 is 0V, and the source is the battery voltage. The PMOS transistor Q5 is turned on, and the battery supplies power to the rear display module 15 (such as an LED), causing the display module 15 to display. When the first capacitor C1 is fully charged, the gate voltage of the PMOS transistor Q5 is the battery voltage, and there is no voltage difference between the gate and the source. The PMOS transistor Q5 is turned off and cut off, and the battery VCC stops supplying power to the rear display module 15, causing the display module 15 to go out.

[0064] When the button SW1 is pressed, the positive and negative of the first capacitor C1 are short-circuited and discharged. At this time, the gate voltage of the PMOS transistor Q5 drops back to 0V again, the PMOS transistor Q5 is turned on, and a control signal is output to the display module 15. The battery VCC supplies power to the rear display module 15 (such as an LED), causing the display module 15 to display. When the button SW1 is released, the charging process of the first capacitor C1 is repeated. When the first capacitor C1 is fully charged, the PMOS transistor is turned off and cut off, and the battery VCC stops supplying power to the rear display module 15, causing the display module 15 to go out. Thus, the function of displaying the battery power when the button SW1 is pressed and automatically turning off after a delay is achieved. The delay time is the discharge time of the first capacitor C1, and the delay time can be achieved by adjusting the parameters of the first resistor R1 and the first capacitor C1. At this time, through the cooperation of the battery power detection circuit 13 and the drive circuit 14, the display module 15 is directly driven, so that the function of displaying the battery power in real time during charging can be realized. Thus, the battery power is displayed by the number of times the LED lights up and goes out through the manual button, and the current power is continuously displayed by the lit LED during battery charging. It is simple and efficient, purely hardware-controlled, does not require software control, has reliable performance, low cost, and is easy to implement.

[0065] In one embodiment, as Figure 2 shown, further, the battery power detection and display circuit 10 further includes a voltage stabilizing circuit 12. The voltage stabilizing circuit 12 is electrically connected to the output end of the button detection circuit 11 for stabilizing the output voltage of the button detection circuit 11. Specifically, the voltage stabilizing circuit 12 is electrically connected to the drain of the PMOS transistor Q5 for stabilizing the output voltage of the PMOS transistor Q5.

[0066] Specifically, as Figure 3 and Figure 4As shown, the voltage stabilizing circuit includes a first diode D1. The positive electrode of the first diode D1 is electrically connected to the external 5V power supply terminal, and the negative electrode is electrically connected to the drain of the PMOS transistor Q5, for stabilizing the output voltage of the PMOS transistor Q5.

[0067] In one embodiment, the power detection circuit 13 is electrically connected to the battery VCC and the drive circuit 14 respectively, and is used for dividing the battery voltage to form a plurality of proportional voltage divisions, comparing the plurality of proportional voltage divisions with a reference voltage, and outputting a drive signal to the drive circuit 14 according to the comparison result.

[0068] Specifically, the power detection circuit 13 includes a plurality of power detection sub - circuits 131.

[0069] As Figure 3 shown, the power detection sub - circuit 131 includes a proportional voltage division circuit and a comparison circuit, where: the proportional voltage division circuit includes a first voltage division resistor R30 and a second voltage division resistor R40 connected in series. The first end of the first voltage division resistor R30 is electrically connected to the positive electrode of the battery VCC, for accessing the output voltage of the battery VCC. The second end is connected in series to the first end of the second voltage division resistor R40. The second end of the second voltage division resistor R40 is grounded. The series connection end of the second end of the first voltage division resistor R30 and the first end of the second voltage division resistor R40 is used as the voltage division end of the proportional voltage division circuit. The first voltage division resistor R30 and the second voltage division resistor R40 divide the output voltage of the battery VCC, and the obtained voltage division is used as the proportional voltage division V output from the voltage division end of the proportional voltage division circuit. Among them, the proportional voltage division V = R30 * VCC / (R30 + R40), where VCC is the current output voltage of the battery.

[0070] The comparison circuit includes a comparator U2. The positive input terminal of the comparator U2 is electrically connected to the voltage division end of the proportional voltage division circuit, the negative input terminal is electrically connected to the reference voltage output terminal, and the output terminal is electrically connected to the input terminal of the drive sub - circuit 141 through a fiftieth resistor R50. Among them, the reference voltage output terminal outputs a reference voltage VREF, and this reference voltage VREF is a fixed voltage. For example, the reference voltage VREF is 2.5V.

[0071] During the battery usage, when the proportional voltage division V output at the voltage division end of the proportional voltage division circuit by comparator U2 is greater than the reference voltage VREF at the reference voltage output end, a high level is output to the output end, and a driving signal is output to the driving sub-circuit 141 electrically connected thereto, so that the driving sub-circuit 141 is turned on to drive the display sub-module 151 electrically connected thereto to display. During the battery usage, the battery power will gradually decrease, resulting in a gradual decrease in the current output voltage VCC of the battery, so that the proportional voltage division V output at the voltage division end of the proportional voltage division circuit will also gradually decrease. When the proportional voltage division V output at the voltage division end of the proportional voltage division circuit by comparator U2 is less than the reference voltage VREF at the reference voltage output end, a low level is output to the output end, causing the driving sub-circuit 141 electrically connected thereto to be cut off, and causing the display sub-module 151 electrically connected to the driving sub-circuit 141 to go out.

[0072] The number of power detection sub-circuits 131 required by the power detection circuit 13 depends on the battery power detection and display accuracy of the battery power detection and display circuit 10. The higher the battery power detection and display accuracy, the more power detection sub-circuits 131 are required. That is, the more power detection sub-circuits 131 there are, the higher the battery power detection and display accuracy.

[0073] For example, as Figure 4 shown, the power detection circuit 13 includes 4 power detection sub-circuits 131, namely the first power detection sub-circuit 13A, the second power detection sub-circuit 13B, the third power detection sub-circuit 13C, and the fourth power detection sub-circuit 13D. The battery power detection and display circuit 10 can perform four-level battery power detection and display accuracy, namely the first level to the fourth level. The battery power of the first level is the highest, the battery power of the second level is the second highest, the battery power of the fourth level is the lowest, and the battery power ratios represented by the first level to the fourth level are in an equal-proportion decreasing relationship.

[0074] The circuit structures of several power detection sub - circuits 131 included in the power detection circuit 13 are the same. Each power detection sub - circuit is electrically connected to the battery VCC and can detect the current output voltage VCC of the battery. Since the current output voltage VCC of the battery also changes dynamically during battery use, the divided voltage output at the divided - voltage terminal of the voltage - dividing circuit in each power detection sub - circuit also changes dynamically. When the divided voltage output at the divided - voltage terminal of the voltage - dividing circuit in each power detection sub - circuit reaches and exceeds the divided - voltage threshold, the output terminal of the comparator changes in the same way. At this time, the divided - voltage threshold is equal to the reference voltage VREF at the reference - voltage output terminal. Thus, it can be seen that the divided - voltage thresholds output at the divided - voltage terminals of the voltage - dividing circuits in each power detection sub - circuit are the same and are all equal to the reference voltage VREF at the reference - voltage output terminal. Therefore, the circuit structures of each power detection sub - circuit 131 are the same. By adjusting the resistance values of the first voltage - dividing resistor and the second voltage - dividing resistor in each power detection sub - circuit, the resistance values of the first voltage - dividing resistor and the second voltage - dividing resistor in each power detection sub - circuit can be made different, so that the same divided - voltage threshold can be achieved according to different current output voltages VCC of the battery, and thus the purpose of detecting the battery power can be achieved.

[0075] For example, as Figure 4 shown, the power detection circuit 13 includes 4 power detection sub - circuits 131, namely the first power detection sub - circuit 13A, the second power detection sub - circuit 13B, the third power detection sub - circuit 13C, and the fourth power detection sub - circuit 13D.

[0076] The first power detection sub - circuit 13A includes a first voltage - dividing circuit and a first comparison circuit, where: the first voltage - dividing circuit includes a third resistor R3 and a fourth resistor R4 connected in series (the third resistor R3 and the fourth resistor R4 are the first voltage - dividing resistor R30 and the second voltage - dividing resistor R40 described above). The first end of the third resistor R3 is electrically connected to the positive electrode of the battery VCC for accessing the output voltage of the battery VCC, the second end is connected in series to the first end of the fourth resistor R4, the second end of the fourth resistor R4 is grounded, and the series connection end of the second end of the third resistor R3 and the first end of the fourth resistor R4 is used as the divided - voltage terminal of the first voltage - dividing circuit. The third resistor R3 and the fourth resistor R4 are used as voltage - dividing resistors to divide the output voltage of the battery VCC, and the obtained divided voltage is used as the first proportional divided voltage V1 output at the divided - voltage terminal of this first voltage - dividing circuit. Among them, the first proportional divided voltage V1 = R3 * VCC / (R3 + R4), where VCC is the current output voltage of the battery.

[0077] The first comparison circuit includes a first comparator U2A. The positive input terminal of the first comparator U2A is electrically connected to the voltage division terminal of the first proportional voltage division circuit, the negative input terminal is electrically connected to the reference voltage output terminal, and the output terminal is electrically connected to the input terminal of the first driving sub-circuit 14A through an eleventh resistor R11. At the same time, the first driving sub-circuit 14A is electrically connected to the first display sub-module 15A.

[0078] If the first battery power detection sub-circuit 13A is used to detect the battery power of the first stage. During the use of the battery, the current output voltage VCC of the battery is dynamically changing, and the first proportional voltage division V1 output by the voltage division terminal of the first proportional voltage division circuit in the first battery power detection sub-circuit 13A is also dynamically changing. When the first proportional voltage division V1 output by the voltage division terminal of the first proportional voltage division circuit of the first comparator U2A is greater than the reference voltage VREF of the reference voltage output terminal, a high level is output to the output terminal, and a driving signal is output to the first driving sub-circuit 14A electrically connected thereto, so that the first driving sub-circuit 14A is turned on to drive the first display sub-module 15A electrically connected thereto to display. When the first proportional voltage division V1 output by the voltage division terminal of the first proportional voltage division circuit of the first comparator U2A is less than the reference voltage VREF of the reference voltage output terminal, a low level is output to the output terminal, the first driving sub-circuit 14A electrically connected thereto is turned off, and the first display sub-module 15A electrically connected to the first driving sub-circuit 14A is turned off. At this time, it indicates that the current battery power has dropped below the battery power of the first stage.

[0079] The second battery power detection sub-circuit 13B includes a second proportional voltage division circuit and a second comparison circuit, where: the second proportional voltage division circuit includes a fifth resistor R5 and a sixth resistor R6 connected in series (the fifth resistor R5 and the sixth resistor R6 are the first voltage division resistor R30 and the second voltage division resistor R40 described above). The first end of the fifth resistor R5 is electrically connected to the positive electrode of the battery VCC for accessing the output voltage of the battery VCC, the second end is serially connected to the first end of the sixth resistor R6, the second end of the sixth resistor R6 is grounded, and the series connection end of the second end of the fifth resistor R5 and the first end of the sixth resistor R6 is used as the voltage division terminal of the second proportional voltage division circuit. The fifth resistor R5 and the sixth resistor R6 are used as voltage division resistors to divide the output voltage of the battery VCC, and the obtained voltage division is used as the second proportional voltage division V2 output by the voltage division terminal of this second proportional voltage division circuit. Among them, the second proportional voltage division V2 = R5 * VCC / (R5 + R6), where VCC is the current output voltage of the battery.

[0080] The second comparison circuit includes a second comparator U2B. The positive input terminal of the second comparator U2B is electrically connected to the voltage division terminal of the second proportional voltage division circuit, the negative input terminal is electrically connected to the reference voltage output terminal, and the output terminal is electrically connected to the input terminal of the second driving sub-circuit 14B through the twelfth resistor R12. At the same time, the second driving sub-circuit 14B is electrically connected to the second display module 15B.

[0081] If the second battery power detection sub-circuit 13B is used to detect the battery power of the second stage. During the use of the battery, the current output voltage VCC of the battery is dynamically changing, and the second proportional voltage division V2 output by the voltage division terminal of the second proportional voltage division circuit in the second battery power detection sub-circuit 13B is also dynamically changing. When the second proportional voltage division V2 output by the voltage division terminal of the second proportional voltage division circuit is greater than the reference voltage VREF of the reference voltage output terminal, the second comparator U2B outputs a high level to the output terminal and outputs a driving signal to the second driving sub-circuit 14B electrically connected thereto, so that the second driving sub-circuit 14B is turned on to drive the second display module 15B electrically connected thereto to display. When the second proportional voltage division V2 output by the voltage division terminal of the second proportional voltage division circuit is less than the reference voltage VREF of the reference voltage output terminal, the second comparator U2B outputs a low level to the output terminal, turns off the second driving sub-circuit 14B electrically connected thereto, and turns off the second display module 15B electrically connected to the second driving sub-circuit 14B. At this time, it indicates that the current battery power has dropped below the battery power of the second stage.

[0082] The third battery power detection sub-circuit 13C includes a third proportional voltage division circuit and a third comparison circuit, where: the third proportional voltage division circuit includes a seventh resistor R7 and an eighth resistor R8 connected in series (the seventh resistor R7 and the eighth resistor R8 are the first voltage division resistor R30 and the second voltage division resistor R40 described above). The first end of the seventh resistor R7 is electrically connected to the positive electrode of the battery VCC for accessing the output voltage of the battery VCC, the second end is connected in series to the first end of the eighth resistor R8, the second end of the eighth resistor R8 is grounded, and the series connection end of the second end of the seventh resistor R7 and the first end of the eighth resistor R8 is used as the voltage division terminal of the third proportional voltage division circuit. The seventh resistor R7 and the eighth resistor R8 are used as voltage division resistors to divide the output voltage of the battery VCC, and the obtained voltage division is used as the third proportional voltage division V3 output by the voltage division terminal of this third proportional voltage division circuit, where the third proportional voltage division V3 = R7 * VCC / (R7 + R8), where VCC is the current output voltage of the battery.

[0083] The third comparison circuit includes a third comparator U2C. The positive input terminal of the third comparator U2C is electrically connected to the voltage division terminal of the third voltage division circuit. The negative input terminal is electrically connected to the reference voltage output terminal. The output terminal is electrically connected to the input terminal of the third drive sub-circuit 14C through a thirteenth resistor R13. At the same time, the third drive sub-circuit 14C is electrically connected to the third display sub-module 15C.

[0084] If the third battery power detection sub-circuit 13B is used to detect the battery power of the third level. During the use of the battery, the current output voltage VCC of the battery is dynamically changing. The third proportional voltage division V3 output by the voltage division terminal of the third voltage division circuit in the third battery power detection sub-circuit 13C is also dynamically changing. When the third proportional voltage division V3 output by the voltage division terminal of the third voltage division circuit in the third comparator U2C is greater than the reference voltage VREF of the reference voltage output terminal, a high level is output to the output terminal, and a drive signal is output to the third drive sub-circuit 14C electrically connected thereto, so that the third drive sub-circuit 14C is turned on to drive the third display sub-module 15C electrically connected thereto to display. When the third proportional voltage division V3 output by the voltage division terminal of the third voltage division circuit in the third comparator U2C is less than the reference voltage VREF of the reference voltage output terminal, a low level is output to the output terminal, the third drive sub-circuit 14C electrically connected thereto is turned off, and the third display sub-module 15C electrically connected to the third drive sub-circuit 14C is turned off. At this time, it indicates that the current battery power has dropped below the battery power of the third level.

[0085] The fourth battery power detection sub-circuit 13D includes a fourth voltage division circuit and a fourth comparison circuit, where: the fourth voltage division circuit includes a ninth resistor R9 and a tenth resistor R10 connected in series (the ninth resistor R9 and the tenth resistor R10 are the first voltage division resistor R30 and the second voltage division resistor R40 described above). The first end of the ninth resistor R9 is electrically connected to the positive electrode of the battery VCC for accessing the output voltage of the battery VCC. The second end is connected in series to the first end of the tenth resistor R10. The second end of the tenth resistor R10 is grounded. The series connection end of the second end of the ninth resistor R9 and the first end of the tenth resistor R10 is used as the voltage division terminal of the fourth voltage division circuit. The ninth resistor R9 and the tenth resistor R10 are used as voltage division resistors to divide the output voltage of the battery VCC, and the obtained voltage division is used as the fourth proportional voltage division V4 output by the voltage division terminal of this fourth voltage division circuit. Among them, the fourth proportional voltage division V4 = R9 * VCC / (R9 + R10), where VCC is the current output voltage of the battery.

[0086] The fourth comparison circuit includes a fourth comparator U2D. The positive input terminal of the fourth comparator U2D is electrically connected to the voltage division terminal of the fourth voltage division circuit. The negative input terminal is electrically connected to the reference voltage output terminal. The output terminal is electrically connected to the input terminal of the fourth driving sub-circuit 14D through a fourteenth resistor R14. At the same time, the fourth driving sub-circuit 14D is electrically connected to the fourth display module 15D.

[0087] If the fourth battery power detection sub-circuit 13D is used to detect the battery power of the fourth stage. During the use of the battery, the current output voltage VCC of the battery is dynamically changing. The fourth voltage division V4 output by the voltage division terminal of the fourth voltage division circuit in the fourth battery power detection sub-circuit 13D is also dynamically changing. When the fourth voltage division V4 output by the voltage division terminal of the fourth voltage division circuit in the fourth comparator U2D is greater than the reference voltage VREF of the reference voltage output terminal, a high level is output to the output terminal, and a driving signal is output to the fourth driving sub-circuit 14D electrically connected thereto, so that the fourth driving sub-circuit 14D is turned on to drive the fourth display module 15D electrically connected thereto to display. When the fourth voltage division V4 output by the voltage division terminal of the fourth voltage division circuit in the fourth comparator U2D is less than the reference voltage VREF of the reference voltage output terminal, a low level is output to the output terminal, the fourth driving sub-circuit 14D electrically connected thereto is turned off, and the fourth display module 15D electrically connected to the fourth driving sub-circuit 14D is turned off. At this time, it indicates that the current battery power has dropped below the battery power of the fourth stage.

[0088] It can be understood that Figure 4 only an example is given that the power detection circuit 13 includes 4 power detection sub-circuits 131, but the power detection circuit 13 is not limited to only including 4 power detection sub-circuits 131. The power detection sub-circuits 131 can be configured according to the actual needs of the battery power detection and display accuracy. For example, 5 power detection sub-circuits 131 or 6 power detection sub-circuits 131 can be configured to increase the battery power detection and display accuracy.

[0089] In one embodiment, the driving circuit 14 is electrically connected to the power detection circuit 13 and the display module 15 respectively, and is used to drive the display module 15 according to the driving signal output by the power detection circuit 13, so that the display module 15 displays under the action of the control signal and the driving signal.

[0090] Specifically, as Figure 3 shown, the driving circuit 14 includes several driving sub-circuits 141. The number of driving sub-circuits 141 included in the driving circuit 14 matches the number of power detection sub-circuits 131 included in the power detection circuit 13. One driving sub-circuit 141 is electrically connected to one power detection sub-circuit 131, that is, the input terminal of one driving sub-circuit 141 is electrically connected to the output terminal of one power detection sub-circuit 131.

[0091] As Figure 3 shown, the driving sub - circuit 141 includes a triode Q10. The base of the triode Q10 is electrically connected to the output terminal of the comparator U2, the emitter is grounded, and the collector is electrically connected to the display sub - module 151. Specifically, when the display sub - module 151 is an LED (Light - Emitting Diode), the collector is connected to the negative electrode of the LED.

[0092] During the use of the battery, when the proportional voltage V output at the voltage - dividing terminal of the proportional voltage - dividing circuit by the comparator U2 is greater than the reference voltage VREF at the reference - voltage output terminal, a high level is output to the output terminal, and a driving signal is given to the triode Q10 electrically connected thereto. The triode Q10 conducts, driving the display sub - module 151 (LED) electrically connected thereto to light up and display. When the proportional voltage V output at the voltage - dividing terminal of the proportional voltage - dividing circuit by the comparator U2 is less than the reference voltage VREF at the reference - voltage output terminal, a low level is output to the output terminal, causing the triode Q10 electrically connected thereto to cut off, and causing the display sub - module 151 (LED) electrically connected to the triode Q10 to go out.

[0093] The number of driving sub - circuits 141 included in the driving circuit 14 matches the number of power - quantity detection sub - circuits 131 included in the power - quantity detection circuit 13, and the circuit structures of each driving sub - circuit are the same.

[0094] For example, as Figure 4 shown, the power - quantity detection circuit 13 includes 4 power - quantity detection sub - circuits 131, namely the first power - quantity detection sub - circuit 13A, the second power - quantity detection sub - circuit 13B, the third power - quantity detection sub - circuit 13C, and the fourth power - quantity detection sub - circuit 13D. Correspondingly, the driving circuit 14 also includes 4 driving sub - circuits, namely the first driving sub - circuit 14A, the second driving sub - circuit 14B, the third driving sub - circuit 14C, and the fourth driving sub - circuit 14D.

[0095] The first driving sub - circuit 14A includes a first triode Q1. The base of the first triode Q1 is electrically connected to the output terminal of the first comparator U2A, the emitter is grounded, and the collector is electrically connected to the first display sub - module 15A. Specifically, when the first display sub - module 15A is the first LED1, the collector is connected to the negative electrode of the first LED1. When the first partial voltage V1 output by the first comparator U2A at the voltage - dividing terminal of the first voltage - dividing circuit is greater than the reference voltage VREF at the reference - voltage output terminal, a high level is output to the output terminal, and a driving signal is output to the first triode Q1 electrically connected thereto. The first triode Q1 conducts, driving the first display sub - module 15A (the first LED1) electrically connected thereto to light up and display. When the first partial voltage V1 output by the first comparator U2A at the voltage - dividing terminal of the first voltage - dividing circuit is less than the reference voltage VREF at the reference - voltage output terminal, a low level is output to the output terminal, causing the first triode Q1 electrically connected thereto to cut off, and causing the first display sub - module 15A (the first LED1) electrically connected to the first triode Q1 to go out.

[0096] The second driving sub - circuit 14B includes a second triode Q2. The base of the second triode Q2 is electrically connected to the output terminal of the second comparator U2B, the emitter is grounded, and the collector is electrically connected to the second display sub - module 15B. Specifically, when the second display sub - module 15B is the second LED2, the collector is connected to the negative electrode of the second LED2. When the second partial voltage V2 output by the second comparator U2B at the voltage - dividing terminal of the second voltage - dividing circuit is greater than the reference voltage VREF at the reference - voltage output terminal, a high level is output to the output terminal, and a driving signal is output to the second triode Q2 electrically connected thereto. The second triode Q2 conducts, driving the second display module 15B (the second LED2) electrically connected thereto to light up and display. When the second partial voltage V2 output by the second comparator U2B at the voltage - dividing terminal of the second voltage - dividing circuit is less than the reference voltage VREF at the reference - voltage output terminal, a low level is output to the output terminal, causing the second triode Q2 electrically connected thereto to cut off, and causing the second display module 15B (the second LED2) electrically connected to the second triode Q2 to go out.

[0097] The third driving sub - circuit 14C includes a third triode Q3. The base of the third triode Q3 is electrically connected to the output terminal of the third comparator U2C, the emitter is grounded, and the collector is electrically connected to the third display sub - module 15C. Specifically, when the third display sub - module 15C is the third LED3, the collector is connected to the negative electrode of the third LED3. When the third proportional voltage division V3 output by the third comparator U2C at the voltage division terminal of the third proportional voltage division circuit is greater than the reference voltage VREF at the reference voltage output terminal, a high level is output to the output terminal, and a driving signal is given to the third triode Q3 electrically connected thereto. The third triode Q3 conducts, driving the third display sub - module 15C (the third LED3) electrically connected thereto to light up and display. When the third proportional voltage division V3 output by the third comparator U2C at the voltage division terminal of the third proportional voltage division circuit is less than the reference voltage VREF at the reference voltage output terminal, a low level is output to the output terminal, causing the third triode Q3 electrically connected thereto to cut off, and causing the third display sub - module 15C (the third LED3) electrically connected to the third triode Q3 to go out.

[0098] The fourth driving sub - circuit 14D includes a fourth triode Q4. The base of the fourth triode Q4 is electrically connected to the output terminal of the fourth comparator U2D, the emitter is grounded, and the collector is electrically connected to the fourth display sub - module 15D. Specifically, when the fourth display module 15D is the fourth LED4, the collector is connected to the negative electrode of the fourth LED4. When the fourth proportional voltage division V4 output by the fourth comparator U2D at the voltage division terminal of the fourth proportional voltage division circuit is greater than the reference voltage VREF at the reference voltage output terminal, a high level is output to the output terminal, and a driving signal is given to the fourth triode Q4 electrically connected thereto. The fourth triode Q4 conducts, driving the fourth display module 15D (the fourth LED4) electrically connected thereto to light up and display. When the fourth proportional voltage division V4 output by the fourth comparator U2D at the voltage division terminal of the fourth proportional voltage division circuit is less than the reference voltage VREF at the reference voltage output terminal, a low level is output to the output terminal, causing the fourth triode Q4 electrically connected thereto to cut off, and causing the fourth display module 15D (the fourth LED4) electrically connected to the fourth triode Q4 to go out.

[0099] In one embodiment, the display module 15 displays under the action of the control signal output by the key detection circuit 11 and the driving signal output by the driving circuit 14.

[0100] Specifically, as Figure 3 shown, the display module 15 includes a plurality of display sub - modules 151. The number of display sub - modules 151 matches the number of driving sub - circuits 141 included in the driving circuit 14, and one display sub - module 151 is electrically connected to one driving sub - circuit 141.

[0101] For example, as Figure 4As shown in the figure, the driving circuit 14 includes four driving sub - circuits, namely the first driving sub - circuit 14A, the second driving sub - circuit 14B, the third driving sub - circuit 14C, and the fourth driving sub - circuit 14D. The display module 15 includes four display sub - modules, namely the first display sub - module 15A, the second display sub - module 15B, the third display sub - module 15C, and the fourth display sub - module 15D. The first ends of the first display sub - module 15A, the second display sub - module 15B, the third display sub - module 15C, and the fourth display sub - module 15D are all electrically connected to the drain of the PMOS transistor Q5 of the key detection circuit 11, and receive the control signal output by the key detection circuit 11 through the first ends, and are controlled by the PMOS transistor Q5. The second ends of the first display sub - module 15A, the second display sub - module 15B, the third display sub - module 15C, and the fourth display sub - module 15D are respectively electrically connected to the output ends of the first driving sub - circuit 14A, the second driving sub - circuit 14B, the third driving sub - circuit 14C, and the fourth driving sub - circuit 14D, and receive the driving signals output by the output ends of the first driving sub - circuit 14A, the second driving sub - circuit 14B, the third driving sub - circuit 14C, and the fourth driving sub - circuit 14D through the second ends, and display under the action of the control signal and the driving signal.

[0102] For example, the first display sub - module 15A, the second display sub - module 15B, the third display sub - module 15C, and the fourth display sub - module 15D are respectively the first LED1, the second LED2, the third LED3, and the fourth LED4. The anodes of the first LED1, the second LED2, the third LED3, and the fourth LED4 are all electrically connected to the drain of the PMOS transistor Q5 of the key detection circuit 11, and receive the control signal output by the key detection circuit 11 through the anodes, and are controlled by the PMOS transistor Q5. The cathode of the first LED1 is electrically connected to the collector of the first triode Q1. When the first triode Q1 is turned on, the first LED1 lights up and displays. When the first triode Q1 is turned off, the first LED1 goes out. The cathode of the second LED2 is electrically connected to the collector of the second triode Q2. When the second triode Q2 is turned on, the second LED2 lights up and displays. When the second triode Q2 is turned off, the second LED2 goes out. The cathode of the third LED3 is electrically connected to the collector of the third triode Q3. When the third triode Q3 is turned on, the third LED3 lights up and displays. When the third triode Q3 is turned off, the third LED3 goes out. The cathode of the fourth LED4 is electrically connected to the collector of the fourth triode Q4. When the fourth triode Q4 is turned on, the fourth LED4 lights up and displays. When the fourth triode Q4 is turned off, the fourth LED4 goes out.

[0103] The present utility model provides a battery power detection and display circuit 10. When it works specifically:

[0104] When the battery power detection and display circuit 10 is initially connected to the battery VCC, the battery VCC charges the first capacitor C1 through the first resistor R1. At this time, the gate voltage of the PMOS transistor Q5 is 0V, and the source is the battery voltage. The PMOS transistor Q5 conducts, and the battery VCC supplies power to the first LED1, the second LED2, the third LED3, and the fourth LED4 of the rear-end display module 15, and the first LED1, the second LED2, the third LED3, and the fourth LED4 light up and display. When the first capacitor C1 is fully charged, the gate voltage of the PMOS transistor Q5 is the battery voltage, and there is no voltage difference between the gate and the source. The PMOS transistor Q5 turns off and cuts off, and the battery VCC stops supplying power to the first LED1, the second LED2, the third LED3, and the fourth LED4 at the rear end, and the first LED1, the second LED2, the third LED3, and the fourth LED4 go out.

[0105] When the button SW1 is pressed, the positive and negative of the first capacitor C1 are short-circuited and discharged. At this time, the gate voltage of the PMOS transistor Q5 drops back to 0V again, the PMOS transistor Q5 conducts, outputs a control signal to the display module 15, and the battery VCC supplies power to the first LED1, the second LED2, the third LED3, and the fourth LED4 of the rear-end display module 15. At this time, in the power detection circuit 13, if the first comparator U2A of the first power detection sub-circuit 13A outputs a first proportional voltage division V1 at the divided voltage end of the first proportional voltage division circuit that is greater than the reference voltage VREF at the reference voltage output end, the second comparator U2B of the second power detection sub-circuit 13B outputs a second proportional voltage division V2 at the divided voltage end of the second proportional voltage division circuit that is greater than the reference voltage VREF at the reference voltage output end, the third comparator U2C of the third power detection sub-circuit 13C outputs a third proportional voltage division V3 at the divided voltage end of the third proportional voltage division circuit that is greater than the reference voltage VREF at the reference voltage output end, and the fourth comparator U2D of the fourth power detection sub-circuit 13D outputs a fourth proportional voltage division V4 at the divided voltage end of the fourth proportional voltage division circuit that is greater than the reference voltage VREF at the reference voltage output end, they all output high levels to the output end, output a drive signal to the first triode Q1, the second triode Q2, the third triode Q3, and the fourth triode Q4 electrically connected to them to conduct, and drive the first LED1, the second LED2, the third LED3, and the fourth LED4 electrically connected to them to all light up and display.

[0106] If the first comparator U2A of the first power detection sub-circuit 13A outputs a first proportional voltage division V1 at the divided voltage end of the first proportional voltage division circuit that is less than the reference voltage VREF at the reference voltage output end, it outputs a low level to the output end, making the first triode Q1 electrically connected to it cut off, and making the first LED1 electrically connected to the first triode Q1 go out. At this time, the second LED2, the third LED3, and the fourth LED4 are still lit, indicating that the current battery power has dropped below the first-level battery power.

[0107] When the second comparator U2B of the second battery power detection sub-circuit 13B outputs a low level to the output terminal when the second proportional voltage division V2 output at the voltage division terminal of the second proportional voltage division circuit is less than the reference voltage VREF at the reference voltage output terminal, the second triode Q2 electrically connected thereto is cut off, and the second LED2 electrically connected to the second triode Q2 is turned off. At this time, the first LED1 and the second LED2 are turned off, and the third LED3 and the fourth LED4 are still lit, indicating that the current battery power has dropped below the second-level battery power.

[0108] When the third comparator U2C of the third battery power detection sub-circuit 13C outputs a low level to the output terminal when the third proportional voltage division V3 output at the voltage division terminal of the third proportional voltage division circuit is less than the reference voltage VREF at the reference voltage output terminal, the third triode Q3 electrically connected thereto is cut off, and the third LED3 electrically connected to the third triode Q3 is turned off. At this time, the first LED1, the second LED2, and the third LED3 are turned off, and the fourth LED4 is still lit, indicating that the current battery power has dropped below the third-level battery power.

[0109] When the fourth comparator U2D of the fourth battery power detection sub-circuit 13D outputs a low level to the output terminal when the fourth proportional voltage division V4 output at the voltage division terminal of the fourth proportional voltage division circuit is less than the reference voltage VREF at the reference voltage output terminal, the fourth triode Q4 electrically connected thereto is cut off, and the fourth LED4 electrically connected to the fourth triode Q4 is turned off. At this time, the first LED1, the second LED2, the third LED3, and the fourth LED4 are all turned off, indicating that the current battery power has dropped below the fourth-level battery power. At this time, the battery needs to be charged or replaced as soon as possible.

[0110] When the detection switch SW1 is turned on, the charging process of the first capacitor C1 is carried out again. When the first capacitor C1 is fully charged, the PMOS transistor is turned off and cut off, and the battery VCC stops supplying power to the first LED1, the second LED2, the third LED3, and the fourth LED4 at the back end, and the first LED1, the second LED2, the third LED3, and the fourth LED4 are turned off. Thus, through the battery power detection and display circuit, the manual button displays the battery power through the number of lit and extinguished LEDs, and automatically extinguishes after a delay, and continuously lights up to display the current power during battery charging. It is simple and efficient, purely hardware-controlled, does not require software control, the system works stably and reliably, has reliable performance, low cost, is easy to implement, and can solve the problems of complex development and high production costs caused by software debugging in current battery power detection in low-cost and low-precision products.

[0111] It should be noted that in this text, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent in such a process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the existence of additional identical elements in the process, method, article or device comprising that element.

[0112] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; under the idea of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above. For the sake of brevity, they are not provided in detail; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A battery power detection and display circuit, characterized in that: The battery power detection and display circuit comprises: a button, a button detection circuit, a power detection circuit, a driving circuit and a display module; wherein: The key detection circuit is electrically connected to the battery, the key and the display module respectively, and is used to detect whether the key is pressed, and output a control signal to the display module when it is detected that the key is pressed; The power detection circuit is electrically connected to the battery and the drive circuit respectively, and is used to divide the battery voltage to form a plurality of proportional divided voltages, compare the plurality of proportional divided voltages with a reference voltage, and output a drive signal to the drive circuit; The driving circuit is electrically connected to the display module, and is used to drive the display module according to the driving signal, so that the display module displays under the action of the control signal and the driving signal.

2. The battery power detection and display circuit according to claim 1, characterized in that: The key detection circuit includes a PMOS tube, a first resistor and a first capacitor; wherein: The first end of the first resistor is electrically connected to the positive electrode of the battery, the second end is electrically connected to the first end of the first capacitor, and the second end of the first capacitor is grounded; The gate of the PMOS tube is electrically connected to the connection end of the second end of the first resistor and the first end of the first capacitor, the source is electrically connected to the positive electrode of the battery, and the drain is electrically connected to the input end of the display module as an output end.

3. The battery power detection and display circuit according to claim 2, characterized in that: The button is connected in parallel with the first capacitor, the first end of the button is electrically connected to the first end of the first capacitor and the gate of the PMOS tube at the same time, and the second end is electrically connected to the second end of the first capacitor and then grounded.

4. The battery power detection and display circuit according to claim 2, characterized in that: The battery power detection and display circuit also includes a voltage stabilizing circuit, and the voltage stabilizing circuit is electrically connected to the output end of the key detection circuit.

5. The battery power detection and display circuit according to claim 4, characterized in that: The voltage stabilizing circuit includes a first diode, wherein the anode of the first diode is electrically connected to the external power supply terminal, and the cathode of the first diode is electrically connected to the drain of the PMOS tube.

6. The battery power detection and display circuit according to claim 2, characterized in that: The power detection circuit includes several power detection sub-circuits; wherein: The power detection subcircuit includes a proportional voltage divider circuit and a comparison circuit, wherein: the proportional voltage divider circuit includes a first voltage divider resistor and a second voltage divider resistor connected in series, the first end of the first voltage divider resistor is electrically connected to the positive electrode of the battery, the second end of the first voltage divider resistor is connected in series to the first end of the second voltage divider resistor, the second end of the second voltage divider resistor is grounded, the series connection end of the second end of the first voltage divider resistor and the first end of the second voltage divider resistor serves as a voltage divider end of the proportional voltage divider circuit, and outputs a proportional voltage divider; The comparison circuit includes a comparator, a positive input terminal of the comparator is electrically connected to the voltage divider terminal of the proportional voltage divider circuit, a negative input terminal is electrically connected to the reference voltage output terminal, and an output terminal is electrically connected to the input terminal of the drive circuit.

7. The battery power detection and display circuit according to claim 6, characterized in that: The driving circuit includes a plurality of driving sub-circuits, the number of the driving sub-circuits matches the number of the power detection sub-circuits, and one driving sub-circuit is electrically connected to one power detection sub-circuit.

8. The battery power detection and display circuit according to claim 7, characterized in that: The driving subcircuit comprises a transistor, a base of the transistor is electrically connected to the output end of the comparator, an emitter is grounded, and a collector is electrically connected to the display module.

9. The battery power detection and display circuit according to claim 8, characterized in that: The display module includes a plurality of display sub-modules, the number of the display sub-modules matches the number of the driving sub-circuits, and one display sub-module is electrically connected to one driving sub-circuit.

10. The battery power detection and display circuit according to claim 9, characterized in that: The display submodule is a light emitting diode, a first end of the light emitting diode is electrically connected to the drain of the PMOS tube, and a second end of the light emitting diode is electrically connected to the collector of the transistor.

Images