Lithium battery pack electric quantity indicating circuit with low static power consumption

Abstract

The utility model relates to a lithium battery pack electric quantity indicating circuit with low static power consumption. The lithium battery pack electric quantity indicating circuit with low static power consumption comprises a power supply module, a voltage sampling module and a main control module, the power supply module comprises a switch KEY1 and a conduction unit, and the switch KEY1 is electrically connected with the conduction unit; the voltage sampling module is electrically connected with the conduction unit; the master control module comprises a chip U3 and an electric quantity display unit, the chip U3 is electrically connected with the voltage sampling module, and the electric quantity display unit is electrically connected with the chip U3. According to the scheme provided by the invention, static power consumption can be reduced, and energy loss is reduced.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and in particular to a low static power consumption lithium battery pack power indicator circuit. Background Technology

[0002] In related technologies, a power indicator module is typically installed to indicate the remaining usable power of a lithium battery pack. This type of power indicator module is activated by a button and uses four or five LEDs to indicate the remaining usable power, offering convenience, speed, and intuitive display. However, the components of this type of power indicator module need to be constantly powered, resulting in relatively high static power consumption. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a low static power consumption lithium battery pack power indicator circuit that can reduce static power consumption and reduce energy loss.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] The first aspect of this application provides a low static power consumption lithium battery pack power indicator circuit, comprising: a power supply module, including a switch KEY1 and a conduction unit, wherein the switch KEY1 is electrically connected to the conduction unit; a voltage sampling module, electrically connected to the conduction unit; and a main control module, including a chip U3 and a power display unit, wherein the chip U3 is electrically connected to the voltage sampling module and the power display unit is electrically connected to the chip U3.

[0006] The conduction unit includes a resistor R18, a MOSFET Q3, a resistor R19, a MOSFET Q4, and a chip U2. The first end of the resistor R18 is electrically connected to the MOSFET Q3, the second end of the resistor R18 is electrically connected to the first end of the resistor R19, the first end of the resistor R19 is also electrically connected to the MOSFET Q3, the second end of the resistor R19 is electrically connected to the MOSFET Q4 and the switch KEY1, and the chip U2 is electrically connected to the switch KEY1 and the MOSFET Q3.

[0007] The power supply module also includes a battery pack, which is electrically connected to the MOSFET Q3 and the MOSFET Q4 respectively.

[0008] The conduction unit also includes a resistor R21, a diode D8, and a resistor R10. The first end of the resistor R21 is electrically connected to the chip U3, the second end of the resistor R21 is electrically connected to the first end of the diode D8, the second end of the diode D8 is electrically connected to the switch KEY1, the first end of the resistor R10 is electrically connected to the chip U3, and the second end of the resistor R10 is electrically connected to the MOSFET Q4.

[0009] The conduction unit also includes a diode D9, the first end of which is electrically connected to the second end of the resistor R19 and the MOSFET Q4, and the second end of the diode D9 is electrically connected to the switch KEY1.

[0010] The voltage sampling module includes an operational amplifier U1, resistors R7, R5, and R6. The operational amplifier U1 is electrically connected to the chip U2. The first end of the resistor R7 is electrically connected to the operational amplifier U1. The second end of the resistor R7 is electrically connected to the first ends of the resistors R5 and R6, respectively. The second end of the resistor R6 is grounded.

[0011] The voltage sampling module further includes a MOSFET Q2, a resistor R4, a MOSFET Q1, and a resistor R1. The MOSFET Q2 is electrically connected to the second end of the resistor R5. The first end of the resistor R4 is electrically connected to the MOSFET Q2. The second end of the resistor R4 is electrically connected to the MOSFET Q1. The first end of the resistor R1 is electrically connected to the MOSFET Q1. The second end of the resistor R1 is connected to the chip U3.

[0012] The voltage sampling module also includes a resistor R17 and a capacitor C11. The first end of the resistor R17 is electrically connected to the operational amplifier U1, and the second end of the resistor R17 is electrically connected to the first end of the capacitor C11 and the chip U3, respectively. The second end of the capacitor C11 is grounded.

[0013] The power display unit includes indicator lights D1, D2, D3, D4 and D5, and indicator lights D1, D2, D3, D4 and D5 are electrically connected to the chip U3.

[0014] The power display unit further includes resistors R12, R16, R15, R14, and R13. The first end of resistor R12 is electrically connected to indicator light D1, and the second end of resistor R12 is electrically connected to chip U2. The first end of resistor R16 is electrically connected to indicator light D2, and the second end of resistor R16 is electrically connected to chip U2. The first end of resistor R15 is electrically connected to indicator light D3, and the second end of resistor R15 is electrically connected to chip U2. The first end of resistor R14 is electrically connected to indicator light D4, and the second end of resistor R14 is electrically connected to chip U2. The first end of resistor R13 is electrically connected to indicator light D5, and the second end of resistor R13 is electrically connected to chip U2.

[0015] Compared with the prior art, the present invention has at least the following advantages:

[0016] By briefly pressing switch KEY1, the conduction unit is powered on. Chip U3 controls the voltage sampling module to read the current voltage of the battery pack to obtain the current battery level status and drives the power display unit to light up after a predetermined delay. Finally, chip U3 drives the conduction unit to turn off, causing the entire power indicator circuit to enter a low-power shutdown state, thereby reducing energy consumption. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below.

[0018] Figure 1 This is a functional block diagram of a low static power consumption lithium battery pack power indicator circuit in one embodiment of the present invention.

[0019] Figure 2 This is a circuit diagram of the power supply module in one embodiment of the present invention;

[0020] Figure 3 This is a circuit diagram of a voltage sampling module in one embodiment of the present invention;

[0021] Figure 4 This is a circuit diagram of the main control module in one embodiment of the present invention. Detailed Implementation

[0022] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make this application more thorough and complete, and to fully convey the scope of this application to those skilled in the art.

[0023] It should be understood that although the terms "first," "second," "third," etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0024] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0025] Currently, to indicate the remaining usable power of a lithium battery pack, a power indicator module is typically installed. This module is activated by a button and uses four or five LEDs to indicate the remaining power, offering convenience, speed, and intuitive display. However, this type of power indicator module requires its components to be constantly powered, resulting in relatively high static power consumption.

[0026] To address the aforementioned issues, this application provides a low static power consumption lithium battery pack power indicator circuit, which can reduce static power consumption and minimize energy loss.

[0027] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0028] Please see Figure 1 A low static power consumption lithium battery pack power indicator circuit includes: a power supply module 100, a voltage sampling module 200, and a main control module 300. The power supply module 100 includes a switch KEY1 and a conduction unit, and the switch KEY1 is electrically connected to the conduction unit. The voltage sampling module 200 is electrically connected to the conduction unit. The main control module 300 includes a chip U3 and a power display unit, and the chip U3 is electrically connected to the voltage sampling module 200 and the power display unit is electrically connected to the chip U3.

[0029] It should be noted that the power supply module 100 powers on the chip U3, and the voltage sampling module 200 collects the voltage state of the battery pack in the power supply module to obtain the battery pack's charge level. Further, by briefly pressing switch KEY1, the conduction unit is energized, and the chip U3 controls the voltage sampling module to read the current voltage of the battery pack to obtain the current charge level, driving the charge display unit to light up after a predetermined delay. Finally, the chip U3 drives the conduction unit to turn off, causing the entire charge indicator circuit to enter a low-power shutdown state, thereby reducing energy consumption.

[0030] Please see Figure 2In one embodiment, the conducting unit includes a resistor R18, a MOSFET Q3, a resistor R19, a MOSFET Q4, and a chip U2. The first end of the resistor R18 is electrically connected to the MOSFET Q3, the second end of the resistor R18 is electrically connected to the first end of the resistor R19, the first end of the resistor R19 is also electrically connected to the MOSFET Q3, the second end of the resistor R19 is electrically connected to the MOSFET Q4 and the switch KEY1, and the chip U2 is electrically connected to the switch KEY1 and the MOSFET Q3.

[0031] Specifically, the power supply module also includes a battery pack, which is electrically connected to MOSFET Q3 and MOSFET Q4 respectively.

[0032] It should be noted that resistors R18 and R19 are adjustable voltage divider resistors. By adjusting the resistance values ​​of resistors R18 and R19, the conducting state of MOSFET Q3 can be maintained, thereby allowing more battery packs to be connected in series.

[0033] Please see Figure 2 In one embodiment, the conduction unit further includes a resistor R21, a diode D8, and a resistor R10. The first end of the resistor R21 is electrically connected to the chip U3, the second end of the resistor R21 is electrically connected to the first end of the diode D8, the second end of the diode D8 is electrically connected to the switch KEY1, the first end of the resistor R10 is electrically connected to the chip U3, and the second end of the resistor R10 is electrically connected to the MOSFET Q4.

[0034] It should be noted that resistors R21 and R10 act as voltage dividers, and diode D8 is a Zener diode.

[0035] Please see Figure 2 In one embodiment, the conduction unit further includes a diode D9, the first end of which is electrically connected to the second end of the resistor R19 and the MOSFET Q4, and the second end of the diode D9 is electrically connected to the switch KEY1.

[0036] It should be noted that diode D9 is a Zener diode.

[0037] Please see Figure 3 In one embodiment, the voltage sampling module 200 includes an operational amplifier U1, resistors R7, R5 and R6. The operational amplifier U1 is electrically connected to the chip U2. The first end of the resistor R7 is electrically connected to the operational amplifier U1. The second end of the resistor R7 is electrically connected to the first end of the resistor R5 and the first end of the resistor R6, respectively. The second end of the resistor R6 is grounded.

[0038] It should be noted that operational amplifier U1 acts as a voltage follower, ensuring the stability of the voltage output to chip U3. Resistors R5, R6, and R7 are all voltage divider resistors, with resistors R5 and R6 being adjustable to accommodate more battery packs.

[0039] Please see Figure 3 In one embodiment, the voltage sampling module 200 further includes a MOSFET Q2, a resistor R4, a MOSFET Q1, and a resistor R1. The second end of the MOSFET Q2 is electrically connected to the second end of the resistor R5. The first end of the resistor R4 is electrically connected to the MOSFET Q2. The second end of the resistor R4 is electrically connected to the MOSFET Q1. The first end of the resistor R1 is electrically connected to the MOSFET Q1. The second end of the resistor R1 is connected to the chip U3.

[0040] Specifically, the voltage sampling module 200 also includes a resistor R17 and a capacitor C11. The first end of the resistor R17 is electrically connected to the operational amplifier U1, the second end of the resistor R17 is electrically connected to the first end of the capacitor C11 and the chip U3, and the second end of the capacitor C11 is grounded.

[0041] It should be noted that resistors R4, R1, and R17 are all voltage divider resistors, and capacitor C11 is a filter capacitor.

[0042] Please see Figure 4 In one embodiment, the power display unit includes indicator lights D1, D2, D3, D4, and D5, which are electrically connected to chip U3. Specifically, the power display unit also includes resistors R12, R16, R15, R14, and R13. The first end of resistor R12 is electrically connected to indicator light D1, and the second end of resistor R12 is electrically connected to chip U2. The first end of resistor R16 is electrically connected to indicator light D2, and the second end of resistor R16 is electrically connected to chip U2. The first end of resistor R15 is electrically connected to indicator light D3, and the second end of resistor R15 is electrically connected to chip U2. The first end of resistor R14 is electrically connected to indicator light D4, and the second end of resistor R14 is electrically connected to chip U2. The first end of resistor R13 is electrically connected to indicator light D5, and the second end of resistor R13 is electrically connected to chip U2.

[0043] It should be noted that resistors R12, R16, R15, R14, and R13 are voltage divider resistors that are matched with indicator lights D1, D2, D3, D4, and D5.

[0044] The circuit principle of this application is described below:

[0045] By briefly pressing switch KEY1, MOSFET Q3 is turned on, and chip U2 outputs 3.3V to chip U3. After chip U3 is powered on, its P02 port outputs a high level. At this time, the drain of MOSFET Q4 is 0V, thus turning on MOSFET Q4. The gate voltage of MOSFET Q3 is the voltage divided by resistors R18 and R19. Here, the voltage divided by resistors R18 and R19 is within the conduction voltage range of MOSFET Q3. Next, chip U3's P04 port outputs a high level, turning on MOSFETs Q1 and Q2. The battery pack voltage is divided by resistors R5 and R6 and sampled by an ADC through chip U3's P05 port. Chip U3 obtains the battery pack voltage based on the ADC sample value and the voltage divider resistor ratio. It also obtains the current state of charge of the battery pack based on the relationship between the open-circuit voltage and the state of charge of the lithium battery cells. Then, chip U3 drives the corresponding number of indicator lights to illuminate through the control port of the low indicator lights according to the state of charge.

[0046] Specifically: 80% < SOC ≤ 100%, indicator lights D1, D2, D3, D4, and D5 light up green; 60% < SOC ≤ 80%, indicator lights D2, D3, D4, and D5 light up green; 40% < SOC ≤ 60%, indicator lights D3, D4, and D5 light up green; 20% < SOC ≤ 40%, indicator lights D4 and D5 light up green; 3% < SOC ≤ 20%, indicator light D5 light up green; SOC ≤ 3%, indicator light D5 flashes red; where SOC refers to the battery pack's charge level.

[0047] Finally, after a 10-second delay, chip U3 will set its P02 port low, turning off MOSFETs Q4 and Q3, thereby shutting off the input to chip U2 and stopping the entire conduction unit from operating, entering a low-power phase. If the delay is less than 10 seconds, pressing switch KEY1 again will reset chip U3's timing by recognizing that its P03 port is low, and after 10 seconds, it will set its P02 port low to turn off MOSFET Q4.

[0048] The solution of this application has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of each embodiment have different focuses; for parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. Those skilled in the art should also understand that the actions and modules involved in the specification are not necessarily essential to this application. Furthermore, it is understood that the steps in the method of this application embodiment can be adjusted, combined, and deleted according to actual needs, and the modules in the device of this application embodiment can be combined, divided, and deleted according to actual needs.

[0049] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A low static power consumption lithium battery pack power indicator circuit, characterized in that, The utility model relates to a kind of power supply module, including switch KEY1 and conduction unit, the switch KEY1 is electrically connected with the conduction unit; Voltage sampling module, electrically connected with the conduction unit; Main control module, including chip U3 and electric quantity display unit, the chip U3 is electrically connected with the voltage sampling module, and the electric quantity display unit is electrically connected with the chip U3. The conduction unit includes resistance R18, MOS tube Q3, resistance R19, MOS tube Q4 and chip U2, the first end of the resistance R18 is electrically connected with the MOS tube Q3, the second end of the resistance R18 is electrically connected with the first end of the resistance R19, the first end of the resistance R19 is also electrically connected with the MOS tube Q3, the second end of the resistance R19 is respectively electrically connected with the MOS tube Q4 and the switch KEY1, and the chip U2 is respectively electrically connected with the switch KEY1 and MOS tube Q3.

2. The low quiescent current lithium battery charge level indicator circuit of claim 1, wherein, The power supply module further includes battery pack, and the battery pack is respectively electrically connected with the MOS tube Q3 and the MOS tube Q4.

3. The low quiescent current lithium battery charge level indicator circuit of claim 2, wherein, The conduction unit further includes resistance R21, diode D8 and resistance R10, the first end of the resistance R21 is electrically connected with the chip U3, the second end of the resistance R21 is electrically connected with the first end of the diode D8, the second end of the diode D8 is electrically connected with the switch KEY1, the first end of the resistance R10 is electrically connected with the chip U3, and the second end of the resistance R10 is electrically connected with the MOS tube Q4.

4. The low quiescent current lithium battery charge level indicator circuit of claim 2, wherein, The conduction unit further includes diode D9, the first end of the diode D9 is respectively electrically connected with the second end of the resistance R19 and the MOS tube Q4, and the second end of the diode D9 is electrically connected with the switch KEY1.

5. The low quiescent current lithium battery charge level indicator circuit of claim 2 or 3, wherein, The voltage sampling module includes operational amplifier U1, resistance R7, resistance R5 and resistance R6, the operational amplifier U1 is electrically connected with the chip U2, the first end of the resistance R7 is electrically connected with the operational amplifier U1, the second end of the resistance R7 is respectively electrically connected with the first end of the resistance R5 and the first end of the resistance R6, and the second end of the resistance R6 is grounded.

6. The low quiescent current lithium battery charge level indicator circuit of claim 2 or 3, wherein, The voltage sampling module further includes MOS tube Q2, resistance R4, MOS tube Q1 and resistance R1, the MOS tube Q2 is electrically connected with the second end of the resistance R5, the first end of the resistance R4 is electrically connected with the MOS tube Q2, the second end of the resistance R4 is electrically connected with the MOS tube Q1, the first end of the resistance R1 is electrically connected with the MOS tube Q1, and the second end of the resistance R1 is connected with the chip U3.

7. The low quiescent current lithium battery charge level indicator circuit of claim 6, wherein, The voltage sampling module further includes resistance R17 and capacitor C11, the first end of the resistance R17 is electrically connected with the operational amplifier U1, the second end of the resistance R17 is respectively electrically connected with the first end of the capacitor C11 and the chip U3, and the second end of the capacitor C11 is grounded.

8. The low quiescent current lithium battery charge level indicator circuit of claim 6, wherein, ​ 9. The low quiescent current lithium battery charge level indicator circuit of claim 8, wherein, The electric quantity display unit comprises an indicator light D1, an indicator light D2, an indicator light D3, an indicator light D4 and an indicator light D5, which are electrically connected with the chip U3 respectively.

10. The low quiescent current lithium battery charge level indicator circuit of claim 9, wherein, The electric quantity display unit further comprises a resistor R12, a resistor R16, a resistor R15, a resistor R14 and a resistor R13, the first end of the resistor R12 is electrically connected with the indicator light D1, the second end of the resistor R12 is electrically connected with the chip U2, the first end of the resistor R16 is electrically connected with the indicator light D2, the second end of the resistor R16 is electrically connected with the chip U2, the first end of the resistor R15 is electrically connected with the indicator light D3, the second end of the resistor R15 is electrically connected with the chip U2, the first end of the resistor R14 is electrically connected with the indicator light D4, the second end of the resistor R14 is electrically connected with the chip U2, the first end of the resistor R13 is electrically connected with the indicator light D5, and the second end of the resistor R13 is electrically connected with the chip U2.

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