CN221042369U - Automatic turn-off protection device for under-voltage battery and electronic equipment - Google Patents
Automatic turn-off protection device for under-voltage battery and electronic equipment Download PDFInfo
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- CN221042369U CN221042369U CN202322825538.3U CN202322825538U CN221042369U CN 221042369 U CN221042369 U CN 221042369U CN 202322825538 U CN202322825538 U CN 202322825538U CN 221042369 U CN221042369 U CN 221042369U
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Abstract
The battery is connected with the voltage stabilizing circuit through the battery input control circuit, the voltage stabilizing circuit is connected with the voltage comparing and protecting circuit and the battery output control circuit, the voltage comparing and protecting circuit is connected with the battery input control circuit, the battery input control circuit outputs battery voltage to the voltage stabilizing circuit when the battery is initially connected, the voltage stabilizing circuit is used for converting the battery voltage into stable voltage and outputting the stable voltage to the voltage comparing and protecting circuit and the battery output control circuit, the battery output control circuit is used for controlling the stable voltage to output to a load, the voltage comparing and protecting circuit is connected with a reference power supply, the stable voltage is compared with a preset reference voltage provided by the reference power supply to judge whether the battery is undervoltage, and the battery input control circuit is cut off when the undervoltage is judged, so that the battery is effectively prevented from being overdischarged.
Description
Technical Field
The present utility model relates to battery control devices, and more particularly, to a battery under-voltage automatic shutdown protection device and an electronic device.
Background
Along with the increasing number of household mobile electric tools, the consumption of batteries is also increasing, and in order to improve the utilization rate of the batteries, the requirements of charge and discharge equipment matched with the batteries are also increasing. However, the current traditional equipment has large standby power consumption which is above the current of the safety level, so that the battery is easily emptied for a long time, the service life of the battery is influenced, and the environment protection and energy saving requirements are not met. The existing common solution is to add a switch at the input end of the device, but some products cannot add a switch due to the limitation of the products, and the design of the switch is added, so that the products are easily damaged due to instant current when the switch operation is performed. In addition, when the electric power switch is used in a high-risk environment (such as a gas station, etc.), sparks can be generated due to the fact that the instantaneous current of the switch is large, and the fire disaster is also at risk.
It should be noted that the information disclosed in the above background section is only for understanding the background of the application and thus may include information that does not form the prior art that is already known to those of ordinary skill in the art.
Disclosure of utility model
The utility model aims to overcome the defects of the background technology and provides a battery undervoltage automatic turn-off protection device and electronic equipment capable of realizing accurate monitoring and protection.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
The battery is connected with the voltage stabilizing circuit through the battery input control circuit, the voltage stabilizing circuit is connected with the voltage comparing and protecting circuit and the battery output control circuit, the voltage comparing and protecting circuit is connected with the battery input control circuit, the battery input control circuit outputs battery voltage to the voltage stabilizing circuit when the battery is initially connected, the voltage stabilizing circuit is used for converting the battery voltage into stable voltage and outputting the stable voltage to the voltage comparing and protecting circuit and the battery output control circuit, the battery output control circuit is used for controlling the stable voltage to be output to a load, the voltage comparing and protecting circuit is connected with a reference power supply, the stable voltage is compared with preset reference voltage provided by the reference power supply to judge whether the battery is under voltage or not, and the battery input control circuit is cut off when the battery is judged to be under voltage.
Further:
The battery input control circuit comprises a capacitor, a voltage dividing circuit, a first switching tube and a third switching tube, wherein the capacitor and the voltage dividing circuit are connected in series between the positive electrode and the negative electrode of the battery, a voltage dividing point of the voltage dividing circuit is connected with a control end of the third switching tube, the control end of the third switching tube is also connected with an output end of the voltage comparison and protection circuit, the output end of the third switching tube is connected with the control end of the first switching tube, and the battery is connected with the voltage stabilizing circuit through the first switching tube.
The voltage comparison and protection circuit comprises a power management IC and a resistor voltage division network, wherein the resistor voltage division network is connected with the reference power supply to generate the preset reference voltage, the voltage input end of the power management IC is connected with the output end of the voltage stabilizing circuit, and the output end of the power management IC is connected with the control end of the third switching tube.
And the output end of the power management IC is connected with the control end of the third switching tube through a diode.
The voltage stabilizing circuit adopts a voltage stabilizer.
The battery output control circuit comprises an MCU and a switch circuit, the voltage stabilizing circuit is connected with the MCU to provide stable voltage for the MCU, the battery is connected with a load through the switch circuit, and the MCU controls the on-off of the switch circuit.
The switching circuit comprises a second switching tube and a fourth switching tube, the MCU is connected with the control end of the fourth switching tube, the output end of the fourth switching tube is connected with the control end of the second switching tube, and the battery supplies power to a load through the second switching tube.
The battery output control circuit comprises an MCU and a switch circuit, the voltage stabilizing circuit is connected with the MCU to provide stable voltage for the MCU, the MCU controls the on-off of the switch circuit, the switch circuit comprises a second switch tube and a fourth switch tube, the MCU is connected with the control end of the fourth switch tube, the output end of the fourth switch tube is connected with the control end of the second switch tube, the battery supplies power to a load through the second switch tube, and the first switch tube and the second switch tube are sequentially connected between the battery and the voltage stabilizing circuit.
An electronic device comprises a battery, a load and the automatic under-voltage shutdown protection device of the battery.
The utility model has the following beneficial effects:
The under-voltage automatic turn-off protection device for the battery can realize safe use and effective management of the battery, reasonably distributes power supply by accurately monitoring the voltage and load state of the battery, automatically cuts off the connection between the battery and the load when necessary to ensure that the voltage of the battery is not over-discharged, protects the electricity safety of the battery and prolongs the service life of the battery. Meanwhile, the circuit can keep lower power consumption during working, reduces energy waste, improves the utilization rate of the battery and meets the requirements of environmental protection and energy saving.
The automatic turn-off protection device for the under-voltage of the battery has high safety, and the circuit can prevent the over-discharge of the battery and protect the safety of the battery through a voltage comparison and under-voltage protection mechanism monitored in real time, and meanwhile, the fire risk caused by the excessive instantaneous current of a switch is avoided.
The modules in the utility model work cooperatively through connection, effectively realize the functions of monitoring and managing the battery voltage in real time, stabilizing voltage output, comparing voltage, protecting and controlling the voltage, and the like, so that the circuit can effectively protect the battery, place over-discharge and prolong the service life of the battery while providing a stable power supply.
Other advantages of embodiments of the present utility model are further described below.
Drawings
Fig. 1 is a circuit diagram of a battery under-voltage automatic shutdown protection device according to an embodiment of the present utility model.
Detailed Description
The following describes embodiments of the present utility model in detail. It should be emphasized that the following description is merely exemplary in nature and is in no way intended to limit the scope of the utility model or its applications.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element. In addition, the connection may be for both a fixing action and a coupling or communication action.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing embodiments of the utility model and to simplify the description by referring to the figures, rather than to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the embodiments of the present utility model, the meaning of "plurality" is two or more, unless explicitly defined otherwise.
Referring to fig. 1, an embodiment of the utility model provides a BATTERY under-voltage automatic shutdown protection device, which comprises a BATTERY input control circuit, a voltage comparison and protection circuit, a voltage stabilizing circuit and a BATTERY output control circuit, wherein a BATTERY is connected with the voltage stabilizing circuit through the BATTERY input control circuit, the voltage stabilizing circuit is connected with the voltage comparison and protection circuit and the BATTERY output control circuit, the voltage comparison and protection circuit is connected with the BATTERY input control circuit, wherein the BATTERY input control circuit outputs a BATTERY voltage to the voltage stabilizing circuit when a BATTERY is initially connected, the voltage stabilizing circuit is used for converting the BATTERY voltage into a stable voltage and outputting the stable voltage to the voltage comparison and protection circuit and the BATTERY output control circuit, the BATTERY output control circuit is used for controlling the stable voltage to be output to a load, the voltage comparison and protection circuit is connected with a reference power supply, the stable voltage is compared with a preset reference voltage provided by the reference power supply to judge whether the BATTERY is under-voltage, and the BATTERY input control circuit is disconnected when the BATTERY is judged under-voltage.
The modules in the under-voltage automatic turn-off protection device for the battery effectively realize the functions of monitoring and managing the voltage of the battery in real time, stabilizing the voltage output, comparing and protecting the voltage, controlling the voltage and the like through connection and cooperative work, so that the circuit can effectively protect the battery, place over-discharge and prolong the service life of the battery while providing a stable power supply.
In a preferred embodiment, the BATTERY input control circuit includes a capacitor C4, a voltage dividing circuit (such as resistors R9 and R10), a first switching tube Q1, and a third switching tube Q3, where the capacitor C4 and the voltage dividing circuit are connected in series between the positive and negative poles of the BATTERY batteri, a voltage dividing point of the voltage dividing circuit is connected to a control end of the third switching tube Q3, the control end of the third switching tube Q3 is further connected to an output end of the voltage comparing and protecting circuit, an output end of the third switching tube Q3 is connected to a control end of the first switching tube Q1, and the BATTERY is connected to the voltage stabilizing circuit through the first switching tube Q1.
In a preferred embodiment, the voltage comparing and protecting circuit includes a power management IC U8 and a resistor divider network (e.g., resistors R11 and R82), the resistor divider network is connected to the reference power b+ to generate the preset reference voltage, a voltage input terminal of the power management IC U8 is connected to an output terminal of the voltage stabilizing circuit, and an output terminal of the power management IC U8 is connected to a control terminal of the third switching tube.
In a preferred embodiment, the output terminal of the power management IC is connected to the control terminal of the third switching tube Q3 through a diode D9.
In a preferred embodiment, the voltage regulator circuit employs an LDO voltage regulator U6.
In a preferred embodiment, the battery output control circuit comprises an MCU and a switch circuit, the voltage stabilizing circuit is connected with the MCU to provide stable voltage for the MCU, the battery is connected with a load through the switch circuit, and the MCU controls on-off of the switch circuit.
In a preferred embodiment, the switching circuit comprises a second switching tube Q2 and a fourth switching tube Q4, the MCU is connected to the control end of the fourth switching tube Q4, the output end of the fourth switching tube Q4 is connected to the control end of the second switching tube Q2, and the battery supplies power to the load through the second switching tube Q2.
In a preferred embodiment, the battery supplies power to a load through the second switching tube Q2, and the first switching tube Q1 and the second switching tube Q2 are sequentially connected between the battery and the voltage stabilizing circuit.
The embodiment of the utility model also provides electronic equipment which comprises a battery, a load and the battery under-voltage automatic turn-off protection device of the embodiment.
The following further describes the working process of the under-voltage automatic shutdown protection device for the battery according to the specific embodiment of the utility model.
When the battery is inserted, the capacitor C4 is charged, and the capacitor C4 is equivalently short-circuited at the moment when the charging of the capacitor C4 is started, so that the equivalent battery voltage is divided by the resistors R9 and R10 to lead the switching tube Q3 to be conducted. After the switching tube Q3 is turned on, VGS of the switching tube Q1 is biased to turn on the switching tube Q1. After the switch tube Q1 is conducted, the battery voltage is transmitted to the LDO voltage stabilizer U6 so as to output 5V power supply voltage, and the 5V power supply voltage supplies power to the power management IC U8 at the moment. Meanwhile, the voltage of the reference power supply B+ is divided by R82 and R11 to form a reference voltage which is sent to the 3 pin of the power management IC U8 and is compared with the 5V power supply voltage of the power management IC U8. Because of the 5V high of VCC and the reference voltage set by 3 feet, the 4 feet of the power management IC U8 outputs 5V high level, and the base electrode of the switching tube Q3 is supplied with power after passing through the diode D9, so that the switching tube Q3 is conducted for a long time. Because the switching tube Q3 is turned on for a long time, the switching tube Q1 is turned on for a long time, so that the battery voltage always supplies power to the U6, and the U6 outputs a stable 5V voltage to the MCU and the power management IC U8, so that the whole product is in a working or standby state. When the MCU detects that the battery or the load is normal, the MCU outputs high level to the base electrode EN3 of the switching tube Q4 so as to conduct the switching tube Q4, and after the switching tube Q4 is conducted, the switching tube Q2 is conducted at the same time, and at the moment, the battery voltage supplies power to the switching tube Q2. In this process, the battery consumes electric energy continuously, when the voltage of the battery decreases to a certain voltage, the voltage input on the power management IC U8 is also decreased compared with the reference voltage of 3 pins, and when the voltage decreases to a set undershoot value (i.e. lower than the reference voltage of 3 pins), the power management IC U8 turns off the output of 4 pins to the switching tube Q3, so that the base of the switching tube Q3 is grounded and the switching tube Q3 is turned off. Since the switching tube Q3 is turned off, the switching tube Q1 is turned off, and the battery voltage is blocked from the load at this time, so that the battery voltage is ensured not to be overdischarged, thereby protecting the safety of the battery. Therefore, the circuit of the embodiment can effectively realize safe use and effective management of the battery.
The background section of the present utility model may contain background information about the problems or environments of the present utility model and is not necessarily descriptive of the prior art. Accordingly, inclusion in the background section is not an admission of prior art by the applicant.
The foregoing is a further detailed description of the utility model in connection with specific/preferred embodiments, and it is not intended that the utility model be limited to such description. It will be apparent to those skilled in the art that several alternatives or modifications can be made to the described embodiments without departing from the spirit of the utility model, and these alternatives or modifications should be considered to be within the scope of the utility model. In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "preferred embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Those skilled in the art may combine and combine the features of the different embodiments or examples described in this specification and of the different embodiments or examples without contradiction. Although embodiments of the present utility model and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the scope of the utility model as defined by the appended claims.
Claims (9)
1. The battery under-voltage automatic turn-off protection device is characterized by comprising a battery input control circuit, a voltage comparison and protection circuit, a voltage stabilizing circuit and a battery output control circuit, wherein the battery is connected with the voltage stabilizing circuit through the battery input control circuit, the voltage stabilizing circuit is connected with the voltage comparison and protection circuit and the battery output control circuit, the voltage comparison and protection circuit is connected with the battery input control circuit, the battery input control circuit outputs a battery voltage to the voltage stabilizing circuit when the battery is initially connected, the voltage stabilizing circuit is used for converting the battery voltage into a stable voltage and outputting the stable voltage to the voltage comparison and protection circuit and the battery output control circuit, the battery output control circuit is used for controlling the stable voltage to be output to a load, the voltage comparison and protection circuit is connected with a reference power supply, the stable voltage is compared with a preset reference voltage provided by the reference power supply to judge whether the battery is under-voltage or not, and the battery input control circuit is cut off when the under-voltage is judged.
2. The under-voltage automatic turn-off protection device for a battery according to claim 1, wherein the battery input control circuit comprises a capacitor, a voltage dividing circuit, a first switching tube and a third switching tube, the capacitor and the voltage dividing circuit are connected in series between the positive electrode and the negative electrode of the battery, a voltage dividing point of the voltage dividing circuit is connected with a control end of the third switching tube, the control end of the third switching tube is further connected with an output end of the voltage comparison and protection circuit, the output end of the third switching tube is connected with the control end of the first switching tube, and the battery is connected with the voltage stabilizing circuit through the first switching tube.
3. The under-voltage automatic shutdown protection device of claim 2, wherein the voltage comparison and protection circuit comprises a power management IC and a resistor divider network, the resistor divider network is connected to the reference power supply to generate the preset reference voltage, a voltage input terminal of the power management IC is connected to an output terminal of the voltage stabilizing circuit, and an output terminal of the power management IC is connected to a control terminal of the third switching tube.
4. The under-voltage automatic shutdown protection device of claim 3, wherein an output terminal of the power management IC is connected to a control terminal of the third switching tube through a diode.
5. The battery under-voltage automatic shutdown protection device of claim 3, wherein the voltage regulator circuit employs an LDO voltage regulator.
6. The under-voltage automatic shutdown protection device of any one of claims 1 to 5, wherein the battery output control circuit comprises an MCU and a switching circuit, the voltage stabilizing circuit is connected with the MCU to provide a stabilized voltage to the MCU, the battery is connected with a load through the switching circuit, and the MCU controls on-off of the switching circuit.
7. The under-voltage automatic turn-off protection device for a battery according to claim 6, wherein the switching circuit comprises a second switching tube and a fourth switching tube, the MCU is connected to the control end of the fourth switching tube, the output end of the fourth switching tube is connected to the control end of the second switching tube, and the battery supplies power to the load through the second switching tube.
8. The under-voltage automatic shutdown protection device of any one of claims 2 to 5, wherein the battery output control circuit comprises an MCU and a switching circuit, the voltage stabilizing circuit is connected with the MCU to provide a stable voltage for the MCU, the MCU controls on-off of the switching circuit, the switching circuit comprises a second switching tube and a fourth switching tube, the MCU is connected with a control end of the fourth switching tube, an output end of the fourth switching tube is connected with a control end of the second switching tube, the battery supplies power to a load through the second switching tube, and the first switching tube and the second switching tube are sequentially connected between the battery and the voltage stabilizing circuit.
9. An electronic device comprising a battery and a load, further comprising a battery under-voltage automatic shutdown protection device as claimed in any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322825538.3U CN221042369U (en) | 2023-10-20 | 2023-10-20 | Automatic turn-off protection device for under-voltage battery and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322825538.3U CN221042369U (en) | 2023-10-20 | 2023-10-20 | Automatic turn-off protection device for under-voltage battery and electronic equipment |
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| Publication Number | Publication Date |
|---|---|
| CN221042369U true CN221042369U (en) | 2024-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322825538.3U Active CN221042369U (en) | 2023-10-20 | 2023-10-20 | Automatic turn-off protection device for under-voltage battery and electronic equipment |
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| Country | Link |
|---|---|
| CN (1) | CN221042369U (en) |
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- 2023-10-20 CN CN202322825538.3U patent/CN221042369U/en active Active
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