Automatic protection device for power shortage of battery

Abstract

The utility model provides an automatic protection device for power shortage of a battery, which is applied to portable electronic equipment and comprises a device body provided with an operation assembly. The auxiliary power supply module is used for converting input DC 24V into DC 12V, DC 5V and DC 3.3 V for supplying power; the input end of the CPU module is connected with a signal sampling module, the output end of the CPU module is connected with the operation assembly, and the device body is connected with the CPU module through a CAN bus. By means of the automatic protection device for the power shortage of the battery, the power shortage state of the portable electronic equipment is automatically and intelligently processed, it is guaranteed that the battery in the product cannot be damaged due to power shortage, and the service life of the product is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of automatic protection of lithium battery power failure, and in particular to an automatic protection device for battery power failure. Background Art

[0002] The rapid development of portable electronic devices has brought great convenience to human life. However, when people use portable electronic devices, they often forget to turn off the power after use, fail to charge in time after power is exhausted, etc. Although the lithium batteries in portable electronic devices have the advantage of high energy density, short-term power exhaustion will lead to a decrease in cycle life, and long-term power exhaustion will directly lead to battery damage.

[0003] It can be seen that it is very important to study an automatic battery power-loss protection device that can improve the cycle life of the battery pack. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a battery low power automatic protection device, which is applied to portable electronic devices, including:

[0005] A device body, on which an operating assembly is disposed;

[0006] An auxiliary power supply module, which converts the input DC24V into DC12V, DC5V and DC3.3V for power supply; and

[0007] A CPU module, wherein the input end of the CPU module is connected to a signal sampling module, the output end of the CPU module is connected to the operating component, and the device body and the CPU module are connected via a CAN bus.

[0008] Furthermore, the operating components include an OLED display screen, an LED indicator light and a MOS tube.

[0009] Furthermore, a button for switching the charging and discharging working mode is provided on the OLED display screen.

[0010] Furthermore, the signal sampling module includes an analog signal sampling circuit and a digital signal sampling circuit. The analog signal sampling circuit includes temperature signal acquisition, voltage and current signal acquisition, and the digital signal sampling circuit includes key input signal acquisition, battery reverse connection signal acquisition, and output open circuit and short circuit signal acquisition.

[0011] Furthermore, the device body also includes a memory, and the memory is connected to the CPU module. When the information recorded in the memory is normal, the CPU module controls the MOS tube to be connected and discharged.

[0012] Furthermore, the signal sampling module adopts the MT9803 acquisition chip.

[0013] Furthermore, the CPU module adopts the GD32F450ZK chip.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] The utility model provides a battery power-deficit automatic protection device, which automatically and intelligently processes the power-deficit state of the portable electronic device, thereby ensuring that the battery inside the product will not be damaged due to power deficient, and prolonging the service life of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural block diagram of the utility model;

[0017] Figure 2 This is the auxiliary power supply circuit diagram of the utility model;

[0018] Figure 3 It is the temperature sampling circuit diagram of the utility model;

[0019] Figure 4 It is the voltage sampling circuit diagram of the utility model;

[0020] Figure 5 It is the charging and discharging current sampling circuit diagram of the utility model;

[0021] Figure 6 It is the charging control circuit diagram of the utility model;

[0022] Figure 7 This is a discharge control circuit diagram of the utility model.

[0023] In the figure: 100, CPU module; 110, analog signal sampling circuit; 111, digital signal sampling circuit; 120, operating component. DETAILED DESCRIPTION

[0024] In order to make the technical scheme and technical effect of the utility model clearer, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments.

[0025] like Figure 1-2As shown, the utility model aims to provide a battery power-deficit automatic protection device for portable electronic devices, which mainly includes a device body, an auxiliary power module and a CPU module 100. An operating component 120 is provided on the device body, such as an OLED display, an LED indicator light and a MOS tube. A button for switching the charge and discharge working mode is provided on the OLED display. The auxiliary power module is powered by a battery pack and provided to the input end of the power module, and the input DC24V is converted into DC12V, DC5V and DC3.3V to power the subsequent optocoupler, integrated circuit, single-chip microcomputer, etc. The input end of the CPU module 100 is connected to a signal sampling module, and the output end is connected to an operating component 120. The device body and the CPU module 100 are connected through a CAN bus communication connection, and data interaction is realized and sent to the OLED display as an interactive interface. The working mode (charging, discharging, automatic switching of charge and discharge), charging voltage and current, and discharge voltage and current are set through buttons, and the operation information and related prompt information are displayed in real time. The CPU module 100 adopts the GD32F450ZK chip, with a main frequency of 120MHz, a Flash of 128kB, and a RAM of 32kB.

[0026] like Figure 3-7 The signal sampling module includes an analog signal sampling circuit 110 and a digital signal sampling circuit 111. The analog signal sampling circuit 110 includes temperature signal acquisition, voltage and current signal acquisition, and the digital signal sampling circuit 111 includes key input signal acquisition, battery reverse connection signal acquisition, and output open circuit / short circuit signal acquisition. The signal sampling module uses the MT9803 acquisition chip.

[0027] The device body also includes a memory, and the memory is connected to the CPU module 100. When the information recorded in the memory is normal, the CPU module 100 can control the output MOS tube to discharge.

[0028] It should be noted that the control and storage circuits and the sampling circuits in the present invention are relatively conventional and will not be described in detail herein.

[0029] When in use, the battery power-loss automatic protection device is divided into two situations, as described below:

[0030] When the portable electronic device is turned on in the off state, the battery power-deficient automatic protection device will automatically start the power-on state and start self-testing to detect the internal battery voltage, SOC, current charging, discharging, overvoltage, undervoltage, manual shutdown, automatic shutdown, etc. After starting up, according to the self-test information, if the self-test information is recorded normally, the CPU module 100 will proceed to the next step and turn on the discharge MOS tube.

[0031] If abnormal data is found in the self-test information, such as multiple over-discharges without timely charging, or failure to shut down as required, the CPU module 100 system detects that the machine has been turned on for too long and has not been used, and the system CPU module 100 issues an automatic shutdown command to prevent the system from running out of power. At the same time, the CPU module 100 will record the abnormal information and store it in the memory.

[0032] When the CPU module 100 detects abnormal data, it analyzes and confirms based on the abnormal data:

[0033] a) Detection of low internal voltage: alarm and request for charging at the same time. After detecting that there is charging current, the charging mode can be entered normally. When there is no charging current after the request, the CPU module 100 issues an automatic shutdown command.

[0034] b) Check and query the time of the real-time clock and the information in the memory, and find that the system has failed to shut down normally for more than 3 times. The CPU module 100 automatically modifies the undervoltage protection point of the automatic power-loss protection control device according to the usage habits, and automatically increases the original protection point. Each time the current protection point is increased, the single cell is increased by 0.2V each time, and the battery pack voltage undervoltage protection point is increased by 0.25V according to the number of series-connected single cells of the module; if it is detected that the system is automatically shut down due to power loss once, the undervoltage protection point is automatically increased by one level, and so on; the upper limit of the protection point is the voltage point corresponding to 50% of the rated capacity of the lithium battery; when it is continuously charged after two uses, and the single charging capacity is greater than 80% of the rated capacity of the battery pack, the protection point of the lithium battery pack automatically returns to the normal protection value.

[0035] As the types of outdoor portable energy storage products increase, the utility model can follow the operating habits of users and automatically and intelligently handle the power-deficient state of the system, ensuring that the internal battery of the product will not be damaged due to power-deficient state, thereby increasing the service life of the product.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A battery low power automatic protection device, applied to portable electronic equipment, characterized in that: include: A device body, on which an operating assembly is disposed; An auxiliary power supply module, which converts the input DC24V into DC12V, DC5V and DC3.3V for power supply; and A CPU module (100), wherein an input end of the CPU module (100) is connected to a signal sampling module, an output end of the CPU module (100) is connected to the operating component (120), and the device body and the CPU module (100) are connected in communication via a CAN bus.

2. The battery power-deficient automatic protection device according to claim 1, characterized in that: The operating component (120) comprises an OLED display screen, an LED indicator light and a MOS tube.

3. The battery power-deficient automatic protection device according to claim 2, characterized in that: The OLED display screen is provided with a button for switching the charging and discharging working mode.

4. The battery power-deficient automatic protection device according to claim 3, characterized in that: The signal sampling module comprises an analog signal sampling circuit (110) and a digital signal sampling circuit (111); the analog signal sampling circuit (110) comprises temperature signal acquisition, voltage and current signal acquisition, and the digital signal sampling circuit (111) comprises key input signal acquisition, battery reverse connection signal acquisition, and output open circuit and short circuit signal acquisition.

5. The battery power-deficient automatic protection device according to claim 2, characterized in that: The device body also comprises a memory, the memory is connected to the CPU module (100), and when the information recorded in the memory is normal, the CPU module (100) controls the MOS tube to be connected and discharged.

6. The battery power-deficient automatic protection device according to claim 1, characterized in that: The signal sampling module adopts MT9803 acquisition chip.

7. The battery power-deficient automatic protection device according to claim 1, characterized in that: The CPU module (100) adopts a GD32F450ZK chip.

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