Battery electric quantity display circuit and battery electric quantity display device

Abstract

The utility model provides a battery electric quantity display circuit and a battery electric quantity display device. The battery electric quantity display circuit comprises a vibration detection module, a time delay module, a switch module and a display module. Wherein the vibration detection module is used for outputting a conduction signal when a vibration signal of an external environment is detected; the delay module is used for outputting a turn-off signal after delaying for a preset time; the switch module is used for controlling the display module to start working and output battery voltage when receiving a conduction signal; the control module is used for controlling the display module to stop working when receiving the turn-off signal; and the display module is used for displaying electric quantity information according to the battery voltage. Vibration signals in the environment are detected through the vibration detection module, the battery electric quantity display function can be achieved without a mechanical switch, the sealing performance and the waterproof performance of the electronic equipment are improved, and the service life of the battery electric quantity display circuit is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of battery power management, and in particular to a battery power display circuit and a battery power display device. Background Technology

[0002] Most current magnetic particle flaw detectors are powered by lithium batteries and use a battery compartment to house the batteries. To minimize the impact of ambient humidity on the working state of the lithium batteries, the lithium batteries are encapsulated in a fully sealed battery compartment, and the remaining power of the lithium-ion batteries inside the power tool is monitored through a battery power display circuit to facilitate the use of the equipment.

[0003] However, battery power display circuits generally use mechanical switches for control. When the user presses the mechanical switch, the battery power display circuit operates; when the user releases the mechanical switch, the battery power display circuit stops operating. Because mechanical switches cannot be fully sealed, liquid can easily enter the interior of the mechanical switch through gaps, leading to an increased failure rate of battery power display circuits using mechanical switches.

[0004] Therefore, existing technologies still need to be improved and developed. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a battery power display circuit and a battery power display device to solve the problems of poor waterproof performance and high failure rate of existing battery power display circuits.

[0006] The technical solution of this utility model is as follows:

[0007] This utility model discloses a battery power display circuit, which includes: a vibration detection module, a delay module, a switch module, and a display module; wherein...

[0008] One end of the vibration detection module is connected to the external battery voltage, and the other end of the vibration detection module is grounded. The vibration detection module is used to output a conduction signal when it detects a vibration signal from the external environment.

[0009] One end of the delay module is connected to the vibration detection module and the battery voltage respectively, and the other end of the delay module is grounded. The delay module is used to output a shutdown signal after a preset delay time.

[0010] The power supply terminal of the switch module is connected to the battery voltage, the control terminal of the switch module is connected to the common terminal of the delay module and the vibration detection module, and the voltage output terminal of the switch module is connected to the display module. The switch module is used to control the display module to start working and output the battery voltage when it receives a conduction signal, and to control the display module to stop working when it receives a shutdown signal.

[0011] The display module is connected to the voltage output terminal of the switch module and is used to display power information based on the battery voltage.

[0012] In a further embodiment of this invention, the vibration detection module includes: a vibration switch, a first resistor, a second resistor, and a first transistor; wherein, one end of the vibration switch is connected to the battery voltage, and the other end of the vibration switch is connected to one end of the first resistor; the other end of the first resistor is connected to one end of the second resistor, and the other end of the second resistor is grounded; the gate of the first transistor is connected to the common terminal of the first and second resistors, the source of the first transistor is connected to the delay module, and the drain of the first transistor is grounded.

[0013] In a further embodiment of this invention, the delay module includes: a fifth resistor and a first capacitor; wherein,

[0014] One end of the fifth resistor is connected to the control terminal of the switch module and the vibration detection module, respectively, and the other end of the fifth resistor is connected to one end of the first capacitor, and the other end of the first capacitor is grounded.

[0015] In a further embodiment of this invention, the switching module includes a second transistor, a third resistor, and a fourth resistor; wherein the second transistor is a PMOS transistor; one end of the third resistor and the source of the second transistor are connected to the battery voltage, the other end of the third resistor is connected to one end of the fourth resistor, and the other end of the fourth resistor is connected to the vibration detection module and the delay module respectively; the gate of the second transistor is connected to the common terminal of the third and fourth resistors, and the drain of the second transistor is connected to the display module.

[0016] In a further embodiment of this invention, the display module includes a voltage warning unit and at least one gear indicator unit. The voltage warning unit and the gear indicator unit are connected in parallel, and one end of the voltage warning unit and one end of the gear indicator unit are connected to the voltage output terminal of the switch module. The other end of the voltage warning unit and the other end of the gear indicator unit are grounded.

[0017] When the battery voltage is lower than the reference voltage, the voltage warning unit alarms; when the battery voltage is higher than the reference voltage, the voltage warning unit operates; when the battery voltage is higher than the critical voltage, the gear indicator unit operates, and the critical voltage of each gear indicator unit increases sequentially.

[0018] In a further embodiment of this invention, the gear indicator unit includes a first gear indicator unit, a second gear indicator unit, a third gear indicator unit, and a fourth gear indicator unit. The first gear indicator unit is used to compare the battery voltage with a first critical voltage. When the battery voltage is greater than the first critical voltage, the first gear indicator unit operates. When the battery voltage is greater than the second critical voltage, the second gear indicator unit operates. When the battery voltage is greater than the third critical voltage, the third gear indicator unit operates. When the battery voltage is greater than the fourth critical voltage, the fourth gear indicator unit operates. The power reference voltage is less than the first critical voltage, the first critical voltage is less than the second critical voltage, the second critical voltage is less than the third critical voltage, and the third critical voltage is less than the fourth critical voltage.

[0019] In a further embodiment of this invention, the voltage warning unit and / or the gear indicator unit includes: a light-emitting diode (LED), a three-terminal parallel voltage regulator, a step-down resistor, a current-limiting resistor, an upper voltage divider resistor, and a lower voltage divider resistor; the anode of the LED is connected to the voltage output terminal of the switching module, the cathode of the LED is connected to one end of the step-down resistor, and the other end of the step-down resistor is connected to the cathode of the three-terminal parallel voltage regulator; one end of the current-limiting resistor is connected to the anode of the LED, and the other end of the current-limiting resistor is connected to the common terminal of the cathode of the LED and the step-down resistor; one end of the upper voltage divider resistor is connected to the voltage output terminal of the switching module, and the other end of the upper voltage divider resistor is connected to one end of the lower voltage divider resistor; the reference terminal of the three-terminal parallel voltage regulator is connected to the common terminal of the upper and lower voltage divider resistors, and the other end of the lower voltage divider resistor and the anode of the three-terminal parallel voltage regulator are grounded; the upper voltage divider resistor is used to control the voltage at the reference terminal of the three-terminal parallel voltage regulator.

[0020] Based on the same inventive concept, this application also provides a battery power display device, which includes: a battery power display circuit as described above, a circuit board, a light guide column, an adhesive layer, a panel, and leads; wherein,

[0021] The battery power display circuit is disposed on the circuit board. The adhesive layer and the panel are sequentially arranged above the battery power display circuit and the circuit board. Through holes for accommodating the light-emitting diodes of the battery power display circuit are respectively formed on the adhesive layer and the panel. The light guide pillar is disposed above the light-emitting diodes of the battery power display circuit. One end of the lead is electrically connected to the battery power display circuit, and the other end of the lead is detachably connected to the battery under test for collecting the battery voltage of the battery under test.

[0022] This utility model provides a battery power display circuit and a battery power display device. The battery power display circuit includes: a vibration detection module, a delay module, a switch module, and a display module. One end of the vibration detection module is connected to the battery voltage, and the other end is grounded. The vibration detection module outputs a conduction signal when it detects a vibration signal from the external environment. One end of the delay module is connected to both the vibration detection module and the battery voltage, and the other end is grounded. The delay module outputs a shutdown signal after a preset delay time. The power supply terminal of the switch module is connected to the battery voltage, and the control terminal of the switch module is connected to the common terminal of the delay module and the vibration detection module. The voltage output terminal of the switch module is connected to the display module. When the switch module receives the conduction signal, it controls the display module to start working and output the battery voltage; and when it receives the shutdown signal, it controls the display module to stop working. The display module is connected to the voltage output terminal of the switch module and displays battery power information based on the battery voltage. This invention uses a vibration detection module to detect vibration signals in the environment to display the remaining battery power, and automatically shuts off after several seconds. It facilitates the use of integrated potting and sealing of the battery power display circuit, improving the sealing and waterproof performance of electronic devices and extending the service life of the battery power display circuit. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the battery power display circuit in this utility model.

[0025] Figure 2 This is a circuit diagram of the battery power display circuit in this utility model.

[0026] Figure 3 This is a schematic diagram of the battery power display device without a panel in this utility model.

[0027] Figure 4 This is a front view of the battery power display device in this utility model.

[0028] The markings in the attached diagram are as follows: 100, Vibration detection module; 200, Delay module; 300, Switch module; 400, Display module; 410, Voltage warning unit; 420, Gear indicator unit; 421, First gear indicator unit; 422, Second gear indicator unit; 423, Third gear indicator unit; 424, Fourth gear indicator unit; 1, Circuit board; 2, Light guide column; 3, Adhesive layer; 4, Panel; 5, Lead wire. Detailed Implementation

[0029] This utility model provides a battery power display circuit and a battery power display device. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following describes this utility model in further detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit this utility model.

[0030] In the implementation methods and claims, unless otherwise specified in the text, the terms "a," "an," "the," and "the" may also include plural forms. If the embodiments of this utility model involve descriptions of "first," "second," etc., such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0031] It should be further understood that the term "comprising" as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, "connected" or "coupled" as used herein can include wireless connections or wireless coupling. The term "and / or" as used herein includes all or any unit and all combinations of one or more associated listed items.

[0032] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0033] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0034] Magnetic particle testing is an instrument used to inspect surface and near-surface defects in ferrous products. It utilizes the interaction between the leakage magnetic field at the defect and the magnetic powder. Taking advantage of the difference in magnetic permeability between the surface and near-surface defects (such as cracks, inclusions, and hairline cracks) and the steel itself, the magnetic field at these discontinuous areas is distorted after magnetization. This creates a leakage magnetic field on the workpiece surface at the point of magnetic flux leakage, attracting magnetic powder and causing it to accumulate at the defect. Under appropriate lighting conditions, the location and shape of the defect become apparent. Observing and interpreting this accumulation of magnetic powder constitutes magnetic particle testing. Magnetic particle testing is one of the five conventional methods of non-destructive testing and a commonly used method for inspecting surface or near-surface defects in ferromagnetic materials. Due to its high sensitivity and simple, reliable process, it is widely used in the manufacturing, installation, and use of pressure vessels (boilers, gas tanks, oil tanks, etc.), pressure pipelines (gas pipes, oil pipes, water pipes), ships, steel, machinery, aerospace, aviation, power, automobiles, motorcycles, petroleum, chemicals, railways, bridges, elevators, amusement parks, and other industries.

[0035] The inventors discovered that over 90% of existing magnetic particle flaw detectors are portable and rechargeable, all requiring a battery level display to allow operators to monitor the instrument's battery status. Current rechargeable magnetic particle flaw detectors have a mechanical button for checking battery level. When pressed, the power display circuit is powered on, displaying the battery level; when released, the circuit is de-energized, turning off the display. Because the current battery level display module uses a mechanical button, it cannot be fully sealed, resulting in a high failure rate. Furthermore, the button's recessed design to prevent accidental presses makes it inconvenient to press, especially when wearing gloves in the field. The current magnetic particle flaw detector battery level display module uses a power-type control mechanism, where the button's mechanical contacts are subject to current flow, making them prone to burning and damage. Additionally, it has poor waterproofing, a high failure rate, and is inconvenient to operate. Therefore, a better battery level display module is urgently needed to meet current requirements.

[0036] Therefore, to overcome the technical deficiencies in the existing technology, please refer to Figure 1This utility model discloses a battery power display circuit, comprising: a vibration detection module 100, a delay module 200, a switch module 300, and a display module 400; wherein, one end of the vibration detection module 100 is externally connected to the battery voltage VBAT, and the other end of the vibration detection module 100 is grounded, and the vibration detection module 100 is used to output a conduction signal when a vibration signal from the external environment is detected; one end of the delay module 200 is connected to both the vibration detection module 100 and the battery voltage VBAT, and the other end of the delay module 200 is grounded, and the delay module 200 is used to output a turn-off signal after a preset delay time. The power supply terminal of the switch module 300 is connected to the battery voltage VBAT. The control terminal of the switch module 300 is connected to the common terminal of the delay module 200 and the vibration detection module 100. The voltage output terminal of the switch module 300 is connected to the display module 400. When the switch module 300 receives a conduction signal, it controls the display module 400 to start working and output the battery voltage VBAT; and when it receives a shutdown signal, it controls the display module 400 to stop working. The display module 400 is connected to the voltage output terminal of the switch module 300 and is used to display power information based on the battery voltage VBAT.

[0037] Specifically, the battery power display circuit is electrically connected to an external lithium battery and connected to the battery voltage VBAT. The switch module 300 is located between the battery voltage VBAT and the display module 400. Under normal conditions, when the vibration detection module 100 is not triggered by a vibration signal, no conduction signal is detected at the control terminal of the switch module 300, and it remains in a closed state. Since the display module 400 uses the battery voltage VBAT as its operating voltage, no battery voltage VBAT passes through the display module 400 at this time, thus keeping it in a power-off state and reducing energy consumption when battery power display is not required. When the vibration detection module 100 detects a vibration signal in the environment, the control terminal of the switch module 300 detects a conduction signal and outputs the battery voltage VBAT to the display module 400, and the display module 400 starts working; at the same time, the delay module 200 delays from the moment the conduction signal is detected, and after a predetermined delay, outputs a shutdown signal to the control terminal of the switch module 300, thereby displaying battery power information for a delayed period of time.

[0038] Please refer to the following: Figure 1 and Figure 2The vibration detection module 100 includes: a vibration switch S1, a first resistor R1, a second resistor R2, and a first transistor Q1; wherein, one end of the vibration switch S1 is connected to the battery voltage VBAT, and the other end of the vibration switch S1 is connected to one end of the first resistor R1; the other end of the first resistor R1 is connected to one end of the second resistor R2, and the other end of the second resistor R2 is grounded; the gate of the first transistor Q1 is connected to the common terminal of the first resistor R1 and the second resistor R2, the source of the first transistor Q1 is connected to the delay module 200, and the drain of the first transistor Q1 is grounded.

[0039] Specifically, the vibration switch S1 is an electronic switch used to sense vibration in the environment and transmit the sensing result to the circuit device to start the circuit. The first transistor Q1 is an NMOS transistor used for switch control. When the vibration switch S1 detects a vibration signal in the environment, the battery voltage VBAT, after being divided by the first resistor R1 and the second resistor R2, is connected to the gate of the first transistor Q1, and the source and drain of the first transistor Q1 are connected. This causes the common terminal of the control terminal of the switch module 300 and one end of the delay module 200 to be momentarily grounded, that is, the conduction signal is a low-level signal.

[0040] Please continue to participate. Figure 1 and Figure 2 The delay module 200 includes a fifth resistor R5 and a first capacitor C1. One end of the fifth resistor R5 is connected to the control terminal of the switch module 300 and the vibration detection module 100, respectively. The other end of the fifth resistor R5 is connected to one end of the first capacitor C1, and the other end of the first capacitor C1 is grounded. Specifically, the fifth resistor R5 is used to divide the voltage at the control terminal of the switch module 300. When the first capacitor C1 is charging, it gradually stores charge over a certain period of time, causing the voltage at the connection point between the fifth resistor R5 and the control terminal of the switch module 300 to slowly rise to the battery voltage VBAT. When the first capacitor C1 is discharging, it releases the stored energy to a lower potential. Thus, the delay function is achieved through the charging process of the capacitor. The shutdown signal is a high-level signal; specifically, the level of the shutdown signal is determined by the current battery voltage VBAT.

[0041] Further, the switching module 300 includes a second transistor Q2, a third resistor R3, and a fourth resistor R4; wherein the second transistor Q2 is a PMOS transistor; one end of the third resistor R3 and the source of the second transistor Q2 are connected to the battery voltage VBAT, the other end of the third resistor R3 is connected to one end of the fourth resistor R4, and the other end of the fourth resistor R4 is connected to the vibration detection module 100 and the delay module 200 respectively; the gate of the second transistor Q2 is connected to the common terminal of the third resistor R3 and the fourth resistor R4, and the drain of the second transistor Q2 is connected to the display module 400. The third resistor R3 and the fourth resistor R4 are used to divide the battery voltage VBAT. Since the source of the second transistor Q2 is connected to the battery voltage VBAT, when the vibration detection module 100 outputs a conduction signal, the gate voltage of the second transistor Q2 is pulled low, thereby turning on the source and drain of the second transistor Q2, and the display module 400 begins to operate. When the delay module 200 outputs a shutdown signal after a preset delay time, the gate voltage of the second transistor Q2 gradually increases until the gate potential and source potential of the second transistor Q2 are equal, and the second transistor Q2 is turned off, thereby controlling the display module 400 to turn off.

[0042] In a further embodiment of this invention, the display module 400 includes a voltage warning unit 410 and at least one gear indicator unit 420. The voltage warning unit 410 and the gear indicator unit 420 are connected in parallel, and one end of the voltage warning unit 410 and one end of the gear indicator unit 420 are connected to the voltage output terminal of the switch module 300. The other ends of the voltage warning unit 410 and the gear indicator unit 420 are grounded. When the battery voltage VBAT is less than the reference voltage, the voltage warning unit 410 alarms; when the battery voltage VBAT is greater than the reference voltage, the voltage warning unit 410 operates; when the battery voltage VBAT is greater than a critical voltage, the gear indicator unit 420 operates, and the critical voltages of each gear indicator unit 420 increase sequentially. It should be noted that the voltage warning unit 410 is used to operate when the remaining charge of the lithium battery is at the lowest gear, to indicate the remaining charge of the lithium battery. The voltage warning unit 410 uses a predetermined value near the termination voltage as its power reference voltage. When the battery voltage VBAT is less than the power reference voltage, it indicates that the remaining power of the lithium battery is close to 0%, and the voltage warning unit 410 flashes an alarm.

[0043] In a further embodiment of this invention, the voltage warning unit 410 and / or the gear indicator unit 420 include: a light-emitting diode (LED), a three-terminal parallel voltage regulator, a step-down resistor, a current-limiting resistor, an upper voltage divider resistor, and a lower voltage divider resistor; the anode of the LED is connected to the voltage output terminal of the switching module 300, the cathode of the LED is connected to one end of the step-down resistor, and the other end of the step-down resistor is connected to the cathode of the three-terminal parallel voltage regulator; one end of the current-limiting resistor is connected to the anode of the LED, and the other end of the current-limiting resistor is connected to the common terminal of the cathode of the LED and the step-down resistor; one end of the upper voltage divider resistor is connected to the voltage output terminal of the switching module 300, and the other end of the upper voltage divider resistor is connected to one end of the lower voltage divider resistor; the reference terminal of the three-terminal parallel voltage regulator is connected to the common terminal of the upper and lower voltage divider resistors, and the other end of the lower voltage divider resistor and the anode of the three-terminal parallel voltage regulator are grounded; the upper voltage divider resistor is used to control the voltage at the reference terminal of the three-terminal parallel voltage regulator.

[0044] Specifically, the voltage warning unit 410 includes a first light-emitting diode D1, a first three-terminal parallel regulator U1, a first step-down resistor R13, a first current-limiting resistor R11, a first upper voltage divider resistor R12, and a first lower voltage divider resistor. The anode of the first light-emitting diode D1 is connected to the voltage output terminal of the first switching module 300, and the cathode of the first light-emitting diode D1 is connected to one end of the first step-down resistor R13. The other end of the first step-down resistor R13 is connected to the cathode of the first three-terminal parallel regulator U1. The first current-limiting resistor R11... One end of the first current-limiting resistor R11 is connected to the anode of the first light-emitting diode D1, and the other end of the first current-limiting resistor R11 is connected to the common terminal of the cathode of the first light-emitting diode D1 and the first step-down resistor R13. One end of the first upper voltage divider resistor R12 is connected to the voltage output terminal of the switching module 300, and the other end of the first upper voltage divider resistor R12 is connected to one end of the first lower voltage divider resistor R14. The reference terminal of the first three-terminal parallel voltage regulator U1 is connected to the common terminal of the first upper voltage divider resistor R12 and the first lower voltage divider resistor R14, and the other end of the first lower voltage divider resistor R14 and the anode of the first three-terminal parallel voltage regulator U1 are grounded. The first upper voltage divider resistor R12 is used to control the voltage at the reference terminal of the first three-terminal parallel voltage regulator U1. The internal connection relationship of the first gear indicator unit 421, the second gear indicator unit 422, the third gear indicator unit 423 and the fourth gear indicator unit 424 is similar to that of the voltage warning unit 410 described above, and will not be repeated here.

[0045] This application uses the voltage warning unit 410 as an example to describe the operation of the voltage warning unit 410 and the gear indicator unit. The first current-limiting resistor R11 is used to shunt the current flowing through the first light-emitting diode D1. The first upper voltage divider resistor R12 and the lower voltage divider resistor are used to divide the battery voltage VBAT. Specifically, since the reference terminal of the first three-terminal parallel regulator U1 is connected to the common terminal of the first upper voltage divider resistor R12 and the lower voltage divider resistor, the battery voltage VBAT value when the first three-terminal parallel regulator U1 is turned on can be adjusted by adjusting the resistance value of the upper voltage divider resistor. The larger the resistance value of the upper voltage divider resistor, the larger the battery voltage VBAT required for the power warning unit to turn on, thereby adjusting the power reference voltage of the voltage warning unit 410.

[0046] Please see Figure 2Preferably, the gear indicator unit includes a first gear indicator unit 421, a second gear indicator unit 422, a third gear indicator unit 423, and a fourth gear indicator unit 424. The first gear indicator unit 421 compares the battery voltage VBAT with a first critical voltage. When the battery voltage VBAT is greater than the first critical voltage, the first gear indicator unit 421 operates; when the battery voltage VBAT is greater than the second critical voltage, the second gear indicator unit 422 operates; when the battery voltage VBAT is greater than the third critical voltage, the third gear indicator unit 423 operates; and when the battery voltage VBAT is greater than the fourth critical voltage, the fourth gear indicator unit 424 operates. The battery power reference voltage is less than the first critical voltage, the first critical voltage is less than the second critical voltage, the second critical voltage is less than the third critical voltage, and the third critical voltage is less than the fourth critical voltage. Thus, the voltage warning unit and the four gear indicator units can be used to indicate four levels of remaining battery power and the condition when the lithium battery is fully charged. The first gear indicator unit 421 includes a second light-emitting diode D2, a second three-terminal parallel regulator U2, a second step-down resistor R23, a second current-limiting resistor R21, a second upper voltage divider resistor R22, and a second lower voltage divider resistor R24; the second gear indicator unit 422 includes a third light-emitting diode D3, a third three-terminal parallel regulator U3, a third step-down resistor R33, a third current-limiting resistor R31, a third upper voltage divider resistor R32, and a third lower voltage divider resistor R34; the third gear indicator unit 423 includes a fourth light-emitting diode D4, a fourth three-terminal parallel regulator U4, a fourth step-down resistor R43, a fourth current-limiting resistor R41, a fourth upper voltage divider resistor R42, and a fourth lower voltage divider resistor R44; and the fourth gear indicator unit 424 includes a fifth light-emitting diode D5, a fifth three-terminal parallel regulator U5, a fifth step-down resistor R53, a fifth current-limiting resistor R51, a fifth upper voltage divider resistor R52, and a fifth lower voltage divider resistor R54. The internal connection relationship of the first gear indicator unit 421, the second gear indicator unit 422, the third gear indicator unit 423, and the fourth gear indicator unit 424 is similar to that of the voltage warning unit 410 described above. Therefore, in order to gradually increase the remaining power of the lithium battery when the voltage warning unit 410, the first gear indicator unit 421, the second gear indicator unit 422, the third gear indicator unit 423, and the fourth gear indicator unit 424 are working, the resistance values ​​of the first upper voltage divider resistor R12, the second upper voltage divider resistor R22, the third upper voltage divider resistor R32, the fourth upper voltage divider resistor R42, and the fifth upper voltage divider resistor R52 are increased accordingly.Preferably, the resistance of the first upper voltage divider resistor R12 is 2kΩ, the resistance of the second upper voltage divider resistor R22 is 26.1kΩ, the resistance of the third upper voltage divider resistor R32 is 34kΩ, the resistance of the fourth upper voltage divider resistor R42 is 36.5kΩ, and the resistance of the fifth upper voltage divider resistor R52 is 38.3kΩ.

[0047] Specifically, please refer to Figure 2 and Figure 3 Taking the battery power display circuit containing four gear indicator units as an example, the specific working process of the battery power display circuit in this application is explained.

[0048] When vibration switch S1 does not vibrate, it is in the open state. At this time, the lithium battery output voltage VBAT charges the first capacitor C1 through the third resistor R3, the fourth resistor R4, and the fifth resistor R5. The voltage of the first capacitor C1 is equal to the battery voltage VBAT. Since the voltages at pins 1 and 2 of the second transistor Q2 are equal, and the gate-source voltage VGS = 0V, the second transistor Q2 is turned off, and the display module 400 is powered off and has no display.

[0049] When vibration switch S1 receives a vibration signal from the environment, the lithium battery is connected to the gate of the first N-channel field-effect transistor Q1 through the first resistor R1. The first transistor Q1 conducts, grounding the connection between the fourth resistor R4 and the fifth resistor R5. The first capacitor C1 discharges rapidly to 0V through the fifth resistor R5. Simultaneously, under the voltage division effect of the third resistor R3 and the fourth resistor R4, the voltage at pin 1 of the second transistor Q2 is lower than the voltage at pin 2, and the second transistor Q2 conducts. The operating voltage of the display module 400 is the battery voltage VBAT, and it begins to work. Table 1 is a schematic table of the LED status in each gear indicator unit under different remaining battery power conditions, where E is the remaining battery power, and D1, D2, D3, D4, and D5 represent the first LED in the first gear indicator unit, the second LED in the second gear indicator unit, the third LED in the third gear indicator unit, the fourth LED in the fourth gear indicator unit, and the fifth LED in the fifth gear indicator unit, respectively.

[0050] Table 1 Lamp Status Diagram

[0051]

[0052] When the remaining charge of the lithium battery is 0%, the first LED D1 flashes under the combined action of the first lower voltage divider resistor R14, the first upper voltage divider resistor R12, the first step-down resistor R13, the first current-limiting resistor R11, and the first three-terminal parallel regulator U1, while the other LEDs are off. When the battery charge is greater than 0% and less than 25%, the first LED D1 lights up under the combined action of the first lower voltage divider resistor R14, the first upper voltage divider resistor R12, the first step-down resistor R13, the first current-limiting resistor R11, and the first three-terminal parallel regulator U1, while the other LEDs are off.

[0053] When the battery charge is greater than or equal to 25% and less than 50%, the first LED D1 lights up under the combined action of the first lower voltage divider resistor R14, the first upper voltage divider resistor R12, the first step-down resistor R13, the first current-limiting resistor R11, and the first three-terminal parallel regulator U1; the second LED D2 lights up under the combined action of the second lower voltage divider resistor R24, the second upper voltage divider resistor R22, the second step-down resistor R23, the second current-limiting resistor R21, and the second three-terminal parallel regulator U2; the other LEDs are off.

[0054] When the battery charge is greater than or equal to 50% and less than 75%, the first LED D1 lights up under the combined action of the first lower voltage divider resistor R14, the first upper voltage divider resistor R12, the first step-down resistor R13, the first current-limiting resistor R11, and the first three-terminal parallel regulator U1; the second LED D2 lights up under the combined action of the second lower voltage divider resistor R24, the second upper voltage divider resistor R22, the second step-down resistor R23, the second current-limiting resistor R21, and the second three-terminal parallel regulator U2; the third LED D3 lights up under the combined action of the third lower voltage divider resistor R34, the third upper voltage divider resistor R32, the third step-down resistor R33, the third current-limiting resistor R31, and the third three-terminal parallel regulator U3; the other LEDs are off.

[0055] When the battery charge is greater than or equal to 75% and less than 100%, the first LED D1 lights up under the combined action of the first lower voltage divider resistor R14, the first upper voltage divider resistor R12, the first step-down resistor R13, the first current-limiting resistor R11, and the first three-terminal parallel regulator U1; the second LED lights up under the combined action of the second lower voltage divider resistor R24, the second upper voltage divider resistor R22, the second step-down resistor R23, the second current-limiting resistor R21, and the second three-terminal parallel regulator U2. The diode D2 lights up; under the combined action of the third lower voltage divider resistor R34, the third upper voltage divider resistor R32, the third step-down resistor R33, the third current-limiting resistor R31, and the third three-terminal parallel regulator U3, the third LED D3 lights up; under the combined action of the fourth lower voltage divider resistor R44, the fourth upper voltage divider resistor R42, the fourth step-down resistor R43, the fourth current-limiting resistor R41, and the fourth three-terminal parallel regulator U4, the fourth LED D4 lights up, and the other LEDs are off.

[0056] When the battery charge is greater than or equal to 100%, the first LED D1 lights up under the combined action of the first lower voltage divider resistor R14, the first upper voltage divider resistor R12, the first step-down resistor R13, the first current-limiting resistor R11, and the first three-terminal parallel voltage regulator U1; the second LED D2 lights up under the combined action of the second lower voltage divider resistor R24, the second upper voltage divider resistor R22, the second step-down resistor R23, the second current-limiting resistor R21, and the second three-terminal parallel voltage regulator U2; the third lower voltage divider resistor R34, the third upper voltage divider resistor R32, and the third step-down resistor U1... Under the combined action of resistor R33, third current-limiting resistor R31, and third three-terminal parallel voltage regulator U3, the third LED D3 lights up; under the combined action of fourth lower voltage divider resistor R44, fourth upper voltage divider resistor R42, fourth step-down resistor R43, fourth current-limiting resistor R41, and fourth three-terminal parallel voltage regulator U4, the fourth LED D4 lights up; under the combined action of fifth lower voltage divider resistor R54, fifth upper voltage divider resistor R52, fifth step-down resistor R53, fifth current-limiting resistor R51, and fifth three-terminal parallel voltage regulator U5, the fifth LED D5 lights up.

[0057] When the vibration switch S1 triggers the power display but does not vibrate (i.e., after a brief triggering), the charge stored in the first capacitor C1 has been released, and the display module 400 is in operation. Since no more vibration is detected, the vibration switch S1 turns off, and the driving electrode of the first transistor Q1 is connected to ground through the second resistor R2, causing the first transistor Q1 to turn off. The battery voltage VBAT slowly charges the first capacitor C1 through the third resistor R3, the fourth resistor R4, and the fifth resistor R5. This process lasts approximately 5–10 seconds. When the voltage of the first capacitor C1 equals the battery voltage VBAT, the potentials of pins 1 and 2 of the second transistor Q2 become equal, causing the second transistor Q2 to turn off, and the display module 400 automatically powers off.

[0058] Based on the same utility model concept, please refer to the following: Figure 3 and Figure 4 This application also provides a battery power display device, comprising: a battery power display circuit (not shown in the figure) as described above, a circuit board 1, a light guide post 2, an adhesive layer 3, a panel 4, and a lead wire 5; wherein, the battery power display circuit is disposed on the circuit board 1, the adhesive layer 3 and the panel 4 are sequentially arranged above the battery power display circuit and the circuit board 1, and through holes for accommodating the light-emitting diodes of the battery power display circuit are respectively formed on the adhesive layer 3 and the panel 4; the light guide post 2 is disposed above the light-emitting diodes of the battery power display circuit; one end of the lead wire 5 is electrically connected to the battery power display circuit, and the other end of the lead wire 5 is detachably connected to the battery under test for acquiring the battery voltage VBAT of the battery under test.

[0059] Specifically, Figure 3The figure shows a cross-sectional view of the battery power display device proposed in this application, and is a schematic diagram of the battery power display device after adding panel 4. The battery power display device is powered on and off by a vibration detection module 100 triggering the power circuit in the battery power display circuit, and then continuously displays the power level through a delay circuit. The power level can be evenly divided into several levels, and the remaining power of the lithium battery is indicated by the working status of the light-emitting diodes. For example, the battery power display device is 70mm long, 15mm wide, and 4mm thick. The bottom layer is a circuit board 1, on which all components of the battery power display circuit, including each light-emitting diode, are soldered. Each light-emitting diode is equipped with a light guide post 2 to guide light onto panel 4 for display. The components are potted and sealed to be waterproof and dustproof, and the leads are connected to the battery output. For example, the number of LEDs corresponds to the number of battery voltage (VBAT) detection levels set in the battery power display circuit. Each LED divides the remaining power range of the lithium battery into several levels. When the remaining power of the lithium battery is at a certain level, the LED indicating the remaining power at that level lights up. The user can judge the remaining power of the lithium battery based on the working status of the corresponding level indicator. In some preferred embodiments of this application, the remaining power of the lithium battery can be divided into multiple segments, namely 0%-25%, 25%-50%, 50%-75%, 75%-100%, and 100%. When a vibration signal is detected in the environment, the battery power detection circuit operates and converts the remaining power of the lithium battery into the on and off states of the LEDs. When the LEDs are working, the light emitted is led out through the light guide post 2 above, and all circuits of the battery power display device are potted and sealed, making it completely waterproof. The vibration switch S1 uses a control signal, the contacts will not burn, and it can be potted and sealed together with other circuits. In this way, as long as the instrument is vibrated, the vibration switch S1 will trigger the power circuit to conduct, and the power display device will show the remaining battery power. After a few seconds, it will automatically cut off the power. It is completely waterproof, has a long lifespan, and is easy to operate.

[0060] This utility model provides a battery power display circuit and a battery power display device. The battery power display circuit includes: a vibration detection module, a delay module, a switch module, and a display module. One end of the vibration detection module is connected to the battery voltage, and the other end is grounded. The vibration detection module outputs a conduction signal when it detects a vibration signal from the external environment. One end of the delay module is connected to both the vibration detection module and the battery voltage, and the other end is grounded. The delay module outputs a shutdown signal after a preset delay time. The power supply terminal of the switch module is connected to the battery voltage, and the control terminal of the switch module is connected to the common terminal of the delay module and the vibration detection module. The voltage output terminal of the switch module is connected to the display module. When the switch module receives the conduction signal, it controls the display module to start working and output the battery voltage; and when it receives the shutdown signal, it controls the display module to stop working. The display module is connected to the voltage output terminal of the switch module and displays battery power information based on the battery voltage. This invention uses a vibration detection module to detect vibration signals in the environment. Users only need to shake the device to display the remaining battery power, and it automatically shuts off after a few seconds. This eliminates the need for a mechanical switch, improving the sealing and waterproofing of electronic devices and extending the lifespan of the battery power display circuit. Simultaneously, the delayed automatic power-off significantly reduces the overall energy consumption of the battery power display circuit, achieving energy savings. Furthermore, the battery power display circuit is relatively simple, with lower overall circuit cost and better reliability.

[0061] It should be understood that the application of this utility model is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A battery power display circuit, characterized in that, include: The system includes a vibration detection module, a delay module, a switch module, and a display module; among which, One end of the vibration detection module is connected to the external battery voltage, and the other end of the vibration detection module is grounded. The vibration detection module is used to output a conduction signal when it detects a vibration signal from the external environment. One end of the delay module is connected to the vibration detection module and the battery voltage respectively, and the other end of the delay module is grounded. The delay module is used to output a shutdown signal after a preset delay time. The power supply terminal of the switch module is connected to the battery voltage, the control terminal of the switch module is connected to the common terminal of the delay module and the vibration detection module, and the voltage output terminal of the switch module is connected to the display module. The switch module is used to control the display module to start working and output the battery voltage when it receives a conduction signal, and to control the display module to stop working when it receives a shutdown signal. The display module is connected to the voltage output terminal of the switch module and is used to display power information based on the battery voltage.

2. The battery power display circuit according to claim 1, characterized in that, The vibration detection module includes: a vibration switch, a first resistor, a second resistor, and a first transistor; wherein, one end of the vibration switch is connected to the battery voltage, and the other end of the vibration switch is connected to one end of the first resistor; the other end of the first resistor is connected to one end of the second resistor, and the other end of the second resistor is grounded; the gate of the first transistor is connected to the common terminal of the first and second resistors, the source of the first transistor is connected to the delay module, and the drain of the first transistor is grounded.

3. The battery power display circuit according to claim 1, characterized in that, The delay module includes: a fifth resistor and a first capacitor; wherein... One end of the fifth resistor is connected to the control terminal of the switch module and the vibration detection module, respectively, and the other end of the fifth resistor is connected to one end of the first capacitor, and the other end of the first capacitor is grounded.

4. The battery power display circuit according to claim 1, characterized in that, The switching module includes a second transistor, a third resistor, and a fourth resistor; wherein the second transistor is a PMOS transistor; one end of the third resistor and the source of the second transistor are connected to the battery voltage, the other end of the third resistor is connected to one end of the fourth resistor, and the other end of the fourth resistor is connected to the vibration detection module and the delay module respectively; the gate of the second transistor is connected to the common terminal of the third and fourth resistors, and the drain of the second transistor is connected to the display module.

5. The battery power display circuit according to claim 1, characterized in that, The display module includes a voltage warning unit and at least one gear indicator unit. The voltage warning unit and the gear indicator unit are connected in parallel, and one end of the voltage warning unit and one end of the gear indicator unit are connected to the voltage output terminal of the switch module. The other end of the voltage warning unit and the other end of the gear indicator unit are grounded. When the battery voltage is lower than the reference voltage, the voltage warning unit alarms; when the battery voltage is higher than the reference voltage, the voltage warning unit operates; when the battery voltage is higher than the critical voltage, the gear indicator unit operates, and the critical voltage of each gear indicator unit increases sequentially.

6. The battery power display circuit according to claim 5, characterized in that, The gear indicator unit includes a first gear indicator unit, a second gear indicator unit, a third gear indicator unit, and a fourth gear indicator unit. The first gear indicator unit is used to compare the battery voltage with a first critical voltage. When the battery voltage is greater than the first critical voltage, the first gear indicator unit operates. When the battery voltage is greater than the second critical voltage, the second gear indicator unit operates. When the battery voltage is greater than the third critical voltage, the third gear indicator unit operates. When the battery voltage is greater than the fourth critical voltage, the fourth gear indicator unit operates. The battery reference voltage is less than the first critical voltage, the first critical voltage is less than the second critical voltage, the second critical voltage is less than the third critical voltage, and the third critical voltage is less than the fourth critical voltage.

7. The battery power display circuit according to claim 5, characterized in that, The voltage warning unit and / or the gear indicator unit includes: a light-emitting diode (LED), a three-terminal parallel voltage regulator, a step-down resistor, a current-limiting resistor, an upper voltage divider resistor, and a lower voltage divider resistor; the anode of the LED is connected to the voltage output terminal of the switching module, the cathode of the LED is connected to one end of the step-down resistor, and the other end of the step-down resistor is connected to the cathode of the three-terminal parallel voltage regulator; one end of the current-limiting resistor is connected to the anode of the LED, and the other end of the current-limiting resistor is connected to the common terminal of the cathode of the LED and the step-down resistor; one end of the upper voltage divider resistor is connected to the voltage output terminal of the switching module, and the other end of the upper voltage divider resistor is connected to one end of the lower voltage divider resistor; the reference terminal of the three-terminal parallel voltage regulator is connected to the common terminal of the upper and lower voltage divider resistors, and the other end of the lower voltage divider resistor and the anode of the three-terminal parallel voltage regulator are grounded; the upper voltage divider resistor is used to control the voltage at the reference terminal of the three-terminal parallel voltage regulator.

8. A battery power display device, characterized in that, include: The battery power display circuit, circuit board, light guide, adhesive layer, panel, and lead wire as described in any one of claims 1-7; wherein, The battery power display circuit is disposed on the circuit board. The adhesive layer and the panel are sequentially arranged above the battery power display circuit and the circuit board. Through holes for accommodating the light-emitting diodes of the battery power display circuit are respectively formed on the adhesive layer and the panel. The light guide pillar is disposed above the light-emitting diodes of the battery power display circuit. One end of the lead is electrically connected to the battery power display circuit, and the other end of the lead is detachably connected to the battery under test for collecting the battery voltage of the battery under test.

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