Lithium battery control circuit for dust collector product

Abstract

The utility model relates to the technical field of lithium battery control, in particular to a lithium battery control circuit for a dust collector product, which comprises an MCU (Microprogrammed Control Unit), and a primary protection module, a secondary protection module, a function starting module, a PWM (Pulse Width Modulation) output module, a current protection module, a temperature detection module, a ground brush motor power supply module and an LED (Light Emitting Diode) indication module which are in communication connection with the MCU, a large number of functions are integrated on the circuit design, various protection functions such as charging and discharging voltage monitoring and temperature rise monitoring of a product are integrated, a plurality of functional modules are integrated, the hardware design cost of the product is reduced while various functions of the product are ensured, the loss power of the product is reduced, and the standby time is prolonged; meanwhile, due to the excellent protection performance, the application safety and reliability of the dust collector product are ensured, and the application cost performance of the dust collector product is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery control, in particular to a lithium battery control circuit for a vacuum cleaner product. Background Art

[0002] Household vacuum cleaners use a battery pack consisting of multiple lithium batteries as a power source. Lithium batteries generate a lot of heat when charging or discharging. If the temperature is too high, it may cause damage to the internal structure of the battery, irreversible electrochemical reactions, reduced battery capacity, and even explosions, fires and other dangerous situations, posing a huge safety hazard when used.

[0003] In the prior art, lithium batteries are controlled only by detecting the operating temperature of the battery pack, while ignoring the problem of instantaneous voltage increase when the battery pack is turned on. Therefore, the use of lithium batteries still has great safety hazards. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a lithium battery control circuit for a vacuum cleaner product, so as to solve the problem that the prior art has insufficient control over lithium batteries and there are still great safety hazards in the use of lithium batteries.

[0005] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides a lithium battery control circuit for a vacuum cleaner product, including an MCU and:

[0006] A primary protection module, wherein the primary protection module uses a first detection chip U5 for detecting the voltage of the battery pack when it is turned on;

[0007] A secondary protection module, wherein the secondary protection module uses a second detection chip U1, and the second detection chip U1 has multiple access ports for respectively accessing and detecting the voltage of each battery of the battery pack;

[0008] A function start module, wherein the function start module uses a plurality of switch buttons KEY, and a single switch button KEY corresponds to an application function;

[0009] A PWM output module, wherein the PWM output module uses a first transistor Q9 and a second transistor Q10, wherein the emitter of the second transistor Q10 is connected to the signal of the switch button KEY, and the collector is connected to the collector of the first transistor Q9; the base of the first transistor Q9 is connected to the MCU, and the MCU outputs various instructions to the outside through the PWM output module;

[0010] A current protection module, wherein the current protection module adopts a first comparator U3A and a second comparator U3B, wherein the output end of the first comparator U3A is connected to the input end of the second comparator U3B, and the input end of the first comparator U3A is connected to the emitter of the transistor Q9, for detecting the working current of the vacuum cleaner product; the output end of the second comparator U3B is connected to the MCU;

[0011] The temperature detection module uses a thermal resistor R8 to detect the temperature of the battery pack.

[0012] In one embodiment of the utility model, the first-level protection module also uses a fuse F2 and a first MOS switch Q13. The first MOS switch Q13 is connected between the voltage detection chip U5 and the fuse F2. When the voltage detection chip U5 detects that the startup voltage of the battery pack is abnormal, it outputs a high level to turn on the MOS switch Q13, thereby lowering the voltage of the fuse F2 to cause it to melt.

[0013] In an embodiment of the present invention, a voltage stabilizing IC module is provided on the PWM output module, and the voltage stabilizing IC module adopts an electrolytic capacitor C28.

[0014] In one embodiment of the utility model, the control circuit includes a floor brush motor power supply module, and the floor brush motor power supply module adopts a second transistor Q7, the base of the second transistor Q7 is connected to the MCU, the collector is connected to the battery pack, and the emitter is connected to the floor brush motor of the vacuum cleaner product.

[0015] In one embodiment of the present invention, the driving circuit further includes an LED indication module, and the LED indication module uses LED1 and LED2 to control the on and off of the LED indicator light on the vacuum cleaner product.

[0016] In an embodiment of the present invention, the first transistor Q9 is an NPN transistor, and the second transistor Q10 is a PNP transistor.

[0017] As described above, the lithium battery control circuit for vacuum cleaner products of the present invention has the following beneficial effects:

[0018] 1. By setting up a primary protection module, the voltage of the battery pack when it is turned on can be detected, and when the voltage is abnormal, such as a short circuit, the fuse can be blown to cut off the current, thereby protecting the safe operation of the circuit and avoiding accidents such as burning circuits, burning components, and fires, thereby improving the safety of battery pack applications and thus improving the safety of vacuum cleaner products;

[0019] 2. By setting up a secondary protection module, a unique single-cell lithium battery detection technology is used to detect the voltage of each lithium battery in the battery pack. When a lithium battery has an abnormal voltage, it is convenient for timely repair and replacement, which greatly improves the safety and reliability of the vacuum cleaner product and extends the service life of the vacuum cleaner product;

[0020] 3. By setting up a current protection module, the working current of the vacuum cleaner product can be detected, and then the working status of the vacuum cleaner product can be monitored, which is conducive to improving the safety and stability of the operation of the vacuum cleaner product;

[0021] 4. By setting up a temperature detection module, the operating temperature of the battery pack can be detected to avoid potential safety hazards caused by overheating of the battery pack, further improving the safety of battery pack applications;

[0022] 5. This application has done a lot of functional integration in circuit design, integrating various protection functions such as charge and discharge voltage monitoring, temperature rise monitoring, etc. of the product, integrating multiple functional modules, streamlining the hardware design cost of the product while ensuring various functions of the product, reducing its own power loss and extending the standby time; at the same time, its excellent protection performance ensures the safe and reliable performance of the vacuum cleaner product application, greatly improving the application cost performance of the vacuum cleaner product. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Shown is a schematic diagram of a lithium battery control circuit for a vacuum cleaner product disclosed in the utility model.

[0024] Figure 2 Display as Figure 1 A magnified image of the MCU.

[0025] Figure 3 Display as Figure 1 Enlarged view of the middle level protection module.

[0026] Figure 4 Display as Figure 3 Enlarged view of point A in the middle.

[0027] Figure 5 Display as Figure 1 Enlarged view of the secondary protection module.

[0028] Figure 6 Display as Figure 1 A magnified view of the functional activation module.

[0029] Figure 7 Display as Figure 1 Enlarged view of the PWM output module and voltage regulator IC module.

[0030] Figure 8 Display as Figure 1A zoomed-in view of the medium current protection module.

[0031] Fig. 9 Display as Figure 1 Enlarged view of the temperature detection module.

[0032] Fig.10 Display as Figure 1 Enlarged view of the center floor brush motor power supply module.

[0033] Fig.11 Display as Figure 1 Enlarged view of the LED indicator module.

[0034] Component number description

[0035] MCU1; primary protection module 2; secondary protection module 3; function start module 4; PWM output module 5; current protection module 6; temperature detection module 7; floor brush motor power supply module 8; LED indication module 9; voltage regulator IC module 10. DETAILED DESCRIPTION

[0036] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0037] See also Figures 1 to 11 It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change in the proportion relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the utility model without affecting the effects and purposes that can be achieved by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the utility model without substantially changing the technical content.

[0038] See also Figure 1-2 The utility model provides a lithium battery control circuit for a vacuum cleaner product, including an MCU1 and a primary protection module 2, a secondary protection module 3, a function start module 4, a PWM output module 5, a current protection module 6, a temperature detection module 7, a floor brush motor power supply module 8, and an LED indication module 9 which are communicatively connected to the MCU1.

[0039] See also Figure 3-4The primary protection module 2 adopts a first detection chip U5, a fuse F2 and a first MOS switch Q13. The first MOS switch Q13 is connected between the voltage detection chip U5 and the fuse F2. When the voltage detection chip U5 detects that the startup voltage of the battery pack is abnormal, it outputs a high level to turn on the MOS switch Q13, thereby lowering the voltage of the fuse F2 to make it melt and be used to detect the voltage when the battery pack is powered on; when the startup voltage detection of the battery pack is abnormal, such as a short circuit, the fuse F2 can be melted to cut off the current, thereby protecting the circuit from running safely, avoiding accidents such as burning the circuit, burning components, and causing fire, thereby improving the safety of the battery pack application, and thereby improving the safety of the vacuum cleaner product.

[0040] See also Figure 5 The secondary protection module 3 adopts a second detection chip U1, and the second detection chip U1 has multiple access ports for respectively accessing and detecting the voltage of each battery in the battery pack; the secondary protection module 3 adopts a unique single-cell lithium battery detection technology to detect the voltage of each lithium battery in the battery pack. When a lithium battery has an abnormal voltage, it is convenient for timely maintenance and replacement, which greatly improves the safety and reliability of the vacuum cleaner product and extends the service life of the vacuum cleaner product.

[0041] See also Figure 6 The function start module 4 uses multiple switch buttons KEY, and a single switch button KEY corresponds to an application function, such as a vacuum cleaner product power-on function, a frequency modulation function, and the like.

[0042] See also Figure 7 The PWM output module 5 adopts a first transistor Q9 and a second transistor Q10, wherein the first transistor Q9 is an NPN transistor and the second transistor Q10 is a PNP transistor; the emitter of the second transistor Q10 is connected to the signal of the switch button KEY, and the collector is connected to the collector of the first transistor Q9; the base of the first transistor Q9 is connected to MCU1, and MCU1 outputs various instructions to the outside through the PWM output module; a voltage stabilizing IC module 10 is arranged on the PWM output module 5, and the voltage stabilizing IC module 10 adopts an electrolytic capacitor C28. During the operation of the circuit, by adjusting the capacitance value of the electrolytic capacitor C28, the voltage fluctuation can be compensated, the voltage in the circuit is stabilized, and the reliability of the various instructions output by MCU1 through the PWM output module 5 is improved.

[0043] See also Figure 8The current protection module 6 adopts a first comparator U3A and a second comparator U3B. The output end of the first comparator U3A is connected to the input end of the second comparator U3B. The input end of the first comparator U3A is connected to the emitter of the transistor Q9, which is used to detect the working current of the vacuum cleaner product; the output end of the second comparator U3B is connected to MCU1; the current protection module 6 can detect the working current of the vacuum cleaner product, and then monitor the working state of the vacuum cleaner product, which is beneficial to improve the safety and stability of the operation of the vacuum cleaner product.

[0044] See also Fig. 9 The temperature detection module 7 uses a thermal resistor R8, which can detect the operating temperature of the battery pack, avoid safety hazards caused by overheating of the battery pack, and further improve the safety of the battery pack application.

[0045] See also Fig.10 The control circuit includes a floor brush motor power supply module 8, and the floor brush motor power supply module 8 uses a second transistor Q7. The base of the second transistor Q7 is connected to MCU1, the collector is connected to the battery pack, and the emitter is connected to the floor brush motor of the vacuum cleaner product. The floor brush motor of the vacuum cleaner product is powered by the battery pack.

[0046] See also Fig.11 The driving circuit also includes an LED indication module 9, which uses LED1 and LED2 to control the LED indicator light on the vacuum cleaner product to intuitively display the operating status of the vacuum cleaner product.

[0047] In summary, the utility model has done a lot of functional integration in circuit design, integrating various protection functions such as charge and discharge voltage monitoring, temperature rise monitoring, etc., integrating multiple functional modules, simplifying the hardware design cost of the product while ensuring various functions of the product, reducing its own power loss, and extending the standby time; at the same time, its excellent protection performance ensures the safety and reliability of the vacuum cleaner product application, greatly improving the application cost performance of the vacuum cleaner product. Therefore, the utility model effectively overcomes various shortcomings in the existing technology and has a high industrial utilization value.

[0048] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A lithium battery control circuit for a vacuum cleaner product, characterized in that: Including MCU and communication connection on MCU: A primary protection module, wherein the primary protection module uses a first detection chip U5 for detecting the voltage of the battery pack when it is turned on; A secondary protection module, wherein the secondary protection module uses a second detection chip U1, and the second detection chip U1 has multiple access ports for respectively accessing and detecting the voltage of each battery of the battery pack; A function start module, wherein the function start module uses a plurality of switch buttons KEY, and a single switch button KEY corresponds to an application function; A PWM output module, wherein the PWM output module uses a first transistor Q9 and a second transistor Q10, wherein the emitter of the second transistor Q10 is connected to the signal of the switch button KEY, and the collector is connected to the collector of the first transistor Q9; the base of the first transistor Q9 is connected to the MCU, and the MCU outputs various instructions to the outside through the PWM output module; A current protection module, wherein the current protection module adopts a first comparator U3A and a second comparator U3B, wherein the output end of the first comparator U3A is connected to the input end of the second comparator U3B, and the input end of the first comparator U3A is connected to the emitter of the transistor Q9, for detecting the working current of the vacuum cleaner product; the output end of the second comparator U3B is connected to the MCU; The temperature detection module uses a thermal resistor R8 to detect the temperature of the battery pack.

2. The lithium battery control circuit for vacuum cleaner products according to claim 1, characterized in that: The primary protection module also uses a fuse F2 and a first MOS switch Q13. The first MOS switch Q13 is connected between the voltage detection chip U5 and the fuse F2. When the voltage detection chip U5 detects that the startup voltage of the battery pack is abnormal, it outputs a high level to turn on the MOS switch Q13, thereby lowering the voltage of the fuse F2 to cause it to melt.

3. The lithium battery control circuit for vacuum cleaner products according to claim 1, characterized in that: A voltage stabilizing IC module is arranged on the PWM output module, and the voltage stabilizing IC module adopts an electrolytic capacitor C28.

4. The lithium battery control circuit for vacuum cleaner products according to claim 1, characterized in that: The control circuit includes a floor brush motor power supply module, and the floor brush motor power supply module adopts a second transistor Q7, the base of the second transistor Q7 is connected to the MCU, the collector is connected to the battery pack, and the emitter is connected to the floor brush motor of the vacuum cleaner product.

5. The lithium battery control circuit for vacuum cleaner products according to claim 4, characterized in that: The control circuit also includes an LED indication module, and the LED indication module uses LED1 and LED2 to control the on and off of the LED indicator light on the vacuum cleaner product.

6. The lithium battery control circuit for vacuum cleaner products according to claim 1, characterized in that: The first transistor Q9 is an NPN transistor, and the second transistor Q10 is a PNP transistor.

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