CN219892997U - Lithium battery overcharge-preventing switching circuit and audio equipment - Google Patents
Lithium battery overcharge-preventing switching circuit and audio equipment Download PDFInfo
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- CN219892997U CN219892997U CN202321262640.0U CN202321262640U CN219892997U CN 219892997 U CN219892997 U CN 219892997U CN 202321262640 U CN202321262640 U CN 202321262640U CN 219892997 U CN219892997 U CN 219892997U
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Abstract
The utility model relates to the technical field of lithium battery charging and discharging, in particular to an overcharge-preventing switching circuit of a lithium battery and audio equipment. The lithium battery charging control device comprises a main control chip, an input port for being connected with external power supply voltage input, a power supply output module, a lithium battery output module and a charging control module, wherein the charging control module comprises a charging control chip and a charging port, the input end of the charging control chip is connected with the input port, the output end of the charging control chip is connected with the charging port of the lithium battery, and the control end of the charging control chip is connected with a charging enabling signal end which is used for outputting a corresponding control signal according to the electric quantity of the lithium battery. The circuit is simple and effective in structure, can practically solve the problem that overcharge is easy to occur when the lithium battery is charged in the use process, avoid long-term overcharge of the lithium battery, ensure the service life of the lithium battery in the audio equipment and improve the use experience of a user.
Description
Technical Field
The utility model relates to the technical field of lithium battery charging and discharging, in particular to an overcharge-preventing switching circuit of a lithium battery and audio equipment.
Background
Along with the updating of electronic equipment, audio equipment also moves towards intelligent, miniaturized development, and wireless audio equipment such as wireless audio amplifier, microphone and megaphone are built-in general, are provided with in the lithium cell and prevent the overcharge condition for preventing that the lithium cell from appearing, cut off its connection with charging source after lithium cell is full of electricity promptly.
However, with the increase of the functions of the audio equipment, the power consumption of the audio equipment is gradually increased, and the situation of insufficient power is easy to occur in the use process of the audio equipment, so that users often need to continuously use the audio equipment in a charging state. Generally, under the condition that audio equipment is used while charging, for example, when inserting the power data line power supply of 5V, prevent that overcharging device can be shielded, the battery of product can be in charge state always, uses in charging process for a long time, influences very much to the life-span of battery, has influenced user's use experience.
Disclosure of Invention
The utility model provides an overcharge-preventing switching circuit of a lithium battery and audio equipment, which are used for solving the technical problem that the service life of the lithium battery is influenced by the fact that the audio equipment is easy to be overcharged in the process of charging and using.
In order to solve the technical problems, the technical scheme of the utility model is as follows:
the lithium battery overcharge-preventing switching circuit comprises a main control chip, an input port for accessing external power supply voltage input, a power supply output module, a lithium battery output module and a charging control module; the main control chip comprises a power supply end, a key detection end for monitoring the starting key action of the lithium battery, an enabling module for controlling the power supply end to output on-off, and a charging enabling signal end for outputting a corresponding control signal according to the electric quantity of the lithium battery; the input end of the power output module is connected with the input port, the output end of the power output module is connected with the power supply end of the main control chip, and the control end of the power output module is connected with the enabling end of the main control chip; the input end of the lithium battery output module is connected with the output end of the lithium battery, the output end of the lithium battery output module is connected with the power supply end of the main control chip, and the control end of the lithium battery output module is connected with the enabling module of the main control chip through the switch component; the charging control module comprises a charging control chip and a charging port, wherein the input end of the charging control chip is connected with the input port, the output end of the charging control chip is connected with the charging port of the lithium battery, and the control end of the charging control chip is connected with a charging enabling signal end which is used for outputting a corresponding control signal according to the electric quantity of the lithium battery on the main control chip.
Further, the enabling module of the main control chip comprises a first enabling end and a second enabling end, the first enabling end and the second enabling end are used for switching signals according to input of the key detection end, the first enabling end is connected with the control end of the power output module, and the second enabling end is connected with the control end of the switch assembly.
Further, the power output module comprises a first triode and a first MOS tube, wherein a base electrode of the first triode is connected with the first enabling end, a collector electrode of the first triode is connected with a grid electrode of the first MOS tube, and an emitter electrode of the first triode is grounded; the source electrode of the first MOS tube is connected with the input port, and the drain electrode of the first MOS tube is connected with the power supply end of the main control chip.
Further, the first MOS transistor is a PMOS transistor, and the first triode is an NPN triode; the grid electrode of the first MOS tube is also connected with the input port through a first resistor.
Further, the switch component comprises a second triode, a second MOS tube and a common cathode diode; the base electrode of the second triode is connected with the second enabling end, the collector electrode of the second triode is connected with the grid electrode of the second MOS tube, and the emitter electrode of the second triode is grounded; the source electrode of the second MOS tube is connected with the output end of the lithium battery, and the drain electrode of the second MOS tube is connected with the power supply end of the main control chip; the first anode of the common cathode diode is connected with the grid electrode of the second MOS tube, the second anode is connected with the key detection end of the main control chip, and the common cathode is grounded by a key through a switch.
Further, the second MOS transistor is a PMOS transistor, and the second triode is an NPN triode; and the grid electrode of the second MOS tube is also connected with the output end of the lithium battery through a second resistor.
Further, the lithium battery output module further comprises a boost module, the boost module is arranged between the output end of the switch assembly and the power supply end of the main control chip, the boost module comprises a boost control chip, the input end of the boost control chip is connected with the output end of the switch assembly, and the output end of the boost control chip is connected with the power supply end of the main control chip.
Further, the charging control module further comprises a charging indicator lamp, the input end of the charging indicator lamp is connected with the input port, and the output end of the charging indicator lamp is connected with the indication enabling port of the charging control module.
Further, the main control chip further comprises a voltage detection port for monitoring output voltage of the lithium battery, and the voltage detection port is connected with the output end of the switch assembly.
The utility model also provides audio equipment, which comprises a lithium battery and the lithium battery overcharge-preventing switching circuit; the lithium battery is connected with an external power supply through the lithium battery overcharge-preventing switching circuit.
According to the utility model, the starting key action of the lithium battery and the output voltage condition of the lithium battery are monitored through the main control chip, when an external power supply and the lithium battery supply power simultaneously, the power supply sequence is adjusted through the power supply output module and the lithium battery output module, and the charging of the lithium battery is controlled through the charging control module, so that the charging and discharging management of the lithium battery during the power supply of the external power supply is realized.
Drawings
Fig. 1 is a block diagram of a lithium battery overcharge-preventing switching circuit in an embodiment of the utility model.
Fig. 2 is a circuit diagram of an overcharge-preventing switching circuit of a lithium battery in an embodiment of the utility model.
Fig. 3 is a partial circuit diagram of a lithium battery output module according to an embodiment of the present utility model.
Wherein:
the device comprises a 1-main control chip, a 2-input port, a 3-power output module, a 4-lithium battery output module, a 5-charging control module and a 6-lithium battery;
the power-on circuit comprises a Q1-first triode, a Q2-second triode, a Q3-first MOS tube, a Q4-second MOS tube, a D1-common cathode diode, a D2-charging indicator lamp, a R1-first resistor, a R2-second resistor, a SW 1-start-up key, a U1-main control chip, a U2-charging chip and a U3-boosting control chip.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. The described embodiments are some, but not all, embodiments of the utility model.
Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model.
Example 1
Fig. 1 shows a block diagram of a lithium battery overcharge-preventing switching circuit in this embodiment; fig. 2 shows a circuit diagram of an overcharge-preventing switching circuit of a lithium battery in this embodiment; fig. 3 shows a partial circuit diagram of the lithium battery output module 4 in the present embodiment.
In view of the fact that the current audio equipment is used while being charged, the battery of the product can be in a charging state all the time and is used in the charging process for a long time, and therefore the service life of the lithium battery is affected. Therefore, the embodiment provides an overcharge-preventing switching circuit for a lithium battery, which is mainly applied to audio equipment, and is used for controlling the power supply of a main control chip and switching the discharge condition of the lithium battery according to the electric quantity of the lithium battery when the lithium battery and an external power supply are simultaneously powered in the use process of the audio equipment.
In terms of specific circuit structures, referring to fig. 1 to 3, the overcharge-preventing switching circuit for a lithium battery in this embodiment specifically includes a main control chip U1, an input port 2 for accessing an external power supply voltage input, a power output module 3, a lithium battery output module 4, and a charging control module 5. The main control chip U1 is configured to detect the action of the start button SW1 and the electric quantity of the lithium battery 6 in the circuit, so as to adjust the enable signals output to the power output module 3 and the lithium battery output module 4, thereby controlling the power supply of the power supply end of the main control chip U1. The input port 2 is used for providing a port connected to the lithium battery overcharge-preventing switching circuit for an external power supply, specifically, the input port 2 is a USB port, and the external power supply adopts a 5V dc output power supply. The power output module 3 is used for controlling the on-off of the voltage output by the input port 2 to the power supply end of the main control chip U1, the control end of the power output module is connected with the main control chip U1, after the main control chip U1 is activated, the main control chip U1 is connected into the input port 2 through the power output module 3, so that the input port 2 supplies power, and the charging and discharging of the lithium battery 6 are conveniently cut off after the lithium battery 6 is charged. The lithium battery output module 4 is similar to the power output module 3 in function, and is mainly used for realizing on-off between the output end of the lithium battery 6 and the power supply end of the main control chip U1, and when the lithium battery output module 4 is conducted, the main control chip U1 can be powered by the output end of the lithium battery 6.
In terms of the charge control module 5, the module is mainly used for realizing charge control of the lithium battery 6, specifically, an enabling pin of the module is connected with a charge enabling signal end of the main control chip U1, an input end and an output end of the module are respectively connected with the input port 2 and a charge port of the lithium battery 6, namely, the module is arranged between an external power supply and the charge port of the lithium battery 6, and connection between the external power supply and the charge port of the lithium battery 6 is turned on or off according to signal input of the main control chip U1, so that the effect of charge control of the lithium battery 6 is achieved. It should be noted that, the charging control module 5 does not need to have a detection function, but performs charging and discharging signal control through the main control chip U1.
In this embodiment, the main control chip U1 includes a power supply terminal, a key detection terminal, an enabling module, and a charging enabling signal terminal. The key detection end is used for monitoring the action of the starting key SW1 of the lithium battery 6, and outputting a signal indicating the action of the starting key SW1 of the lithium battery 6 to the main control chip U1 after the action of the starting key SW1 of the lithium battery 6 is performed for a certain time. The enabling module is mainly used for controlling output on-off between the power supply end of the main control chip U1 and the lithium battery 6 as well as between the main control chip U1 and the input port 2, and the charging enabling signal end is used for outputting a corresponding control signal to the charging control module 5 according to the electric quantity of the lithium battery 6 so as to control whether the lithium battery 6 is charged or not.
The input end of the power output module 3 is connected with the input port 2, the output end is connected with the power supply end of the main control chip U1, the control end is connected with the enabling end of the main control chip U1, when the main control chip U1 is initialized, the enabling end of the main control chip U1 outputs a high-level signal to the control end of the power output module 3, and then the power supply end of the main control chip U1 and the input port 2 are conducted, so that the power supply of the main control chip U1 by an external power supply is realized. On the other hand, the input end of the lithium battery output module 4 is connected with the output end of the lithium battery 6, the output end is connected with the power supply end of the main control chip U1, and the control end is respectively connected with the enabling module of the main control chip U1 through the switch component. When the start button SW1 is pressed, the control end of the lithium battery output module 4 is set low, so that the output end of the lithium battery 6 and the main control chip U1 are conducted, the lithium battery 6 supplies power to the main control chip U1, and the main control chip U1 is activated. After activation, the main control chip U1 detects the start button SW1 through the button detection end, and then a signal is given to the switch assembly through the enabling module, so that the lithium battery 6 is continuously powered.
In the aspect of charging control of the lithium battery 6, the charging control module 5 comprises a charging control chip and a charging port, the input end of the charging control chip is connected with the input port 2, the output end of the charging control chip is connected with the charging port of the lithium battery 6, and the control end of the charging control chip is connected with a charging enabling signal end which is used for outputting a corresponding control signal according to the electric quantity of the lithium battery 6 on the main control chip U1. The main control chip U1 comprises a voltage detection port for monitoring the output voltage of the lithium battery 6, the voltage detection port is connected with the output end of the switch assembly, and when the main control chip U1 detects that the voltage of the lithium battery 6 reaches the preset full-charge voltage through the voltage detection port, an enabling signal for turning off charging is sent to the charging control chip, the connection between the charging port and the input port 2 is cut off, and then charging is stopped. Of course, when the main control chip U1 detects that the voltage of the lithium battery 6 is lower than the preset charging voltage through the voltage detection port, an enabling signal for starting charging is sent to the charging control chip, the connection between the charging port and the input port 2 is started, and then the charging of the lithium battery 6 is started.
The benefit of this embodiment lies in, this embodiment is through the action of main control chip U1 control start button SW1 of lithium cell 6 and the output voltage situation of lithium cell 6, when external power source and lithium cell 6 supply power simultaneously, adjust the power supply order through power output module 3, lithium cell output module 4, charge control module 5 control lithium cell 6's charging, thereby realize the charge-discharge management to lithium cell 6 when external power source supplies power, this circuit structure is simple effective, can effectively solve lithium cell 6 in-process charging and appear the problem of overcharging easily, avoid lithium cell 6's long-term overcharging, guarantee lithium cell 6's in the audio equipment life, improve user's use experience.
Example two
The embodiment also provides an overcharge-preventing switching circuit for a lithium battery, and the structure of the circuit is similar to that of the embodiment, and the difference between the two is that the embodiment also provides some specific implementation manners.
As one preferable embodiment of the present utility model, the enabling module of the main control chip U1 includes a first enabling end and a second enabling end, where the first enabling end and the second enabling end switch signals according to the input of the key detection end, the first enabling end is connected with the control end of the power output module 3, and the second enabling end is connected with the control end of the switch assembly. The first enabling end and the second enabling end are used as control signal ends and are respectively used for controlling switching of external power supply and lithium battery 6 power supply according to input of the key detection end.
Further preferably, the power output module 3 includes a first triode Q1 and a first MOS transistor Q3, where a base electrode of the first triode Q1 is connected to the first enabling end, a collector electrode is connected to a gate electrode of the first MOS transistor Q3, and an emitter electrode is grounded; the source electrode of the first MOS tube Q3 is connected with the input port 2, and the drain electrode is connected with the power supply end of the main control chip U1. In a specific embodiment, the first MOS transistor Q3 is a PMOS transistor, and the first triode Q1 is an NPN triode; the grid electrode of the first MOS tube Q3 is also connected with the input port 2 through a first resistor R1. Before the main control chip U1 is not activated, no signal is given to the base electrode of the first triode Q1 by the first enabling end, the base electrode of the first triode Q1 is in a low level, the first triode Q1 is turned off, the grid electrode of the first MOS tube Q3 is set to be high to be turned off, and the power supply end connected with an external power supply by the main control chip U1 is not provided with voltage input. When the main control chip U1 is activated, the main control chip U1 sends a high level to the base electrode of the first triode Q1 through the first enabling end, the first triode Q1 is conducted, the grid electrode of the first MOS tube Q3 is pulled down to be conducted, and an external power supply supplies power to the main control chip U1 through the input port 2.
On the other hand, it is also preferable that the switch assembly includes a second triode Q2, a second MOS transistor Q4 and a common cathode diode D1, wherein, on the circuit connection, a base electrode of the second triode Q2 is connected with the second enabling end, a collector electrode is connected with a gate electrode of the second MOS transistor Q4, and an emitter electrode is grounded. The source electrode of the second MOS tube Q4 is connected with the output end of the lithium battery 6, and the drain electrode is connected with the power supply end of the main control chip U1. The common cathode diode D1 is composed of two diodes, and the two diodes share a cathode, so that the common cathode diode D1 has two anodes and a common cathode, specifically, the first anode of the common cathode diode D1 is connected with the gate of the second MOS transistor Q4, the second anode is connected with the key detection end of the main control chip U1, and the common cathode is grounded according to the key through a switch. More preferably, the second MOS transistor Q4 is a PMOS transistor, and the second triode Q2 is an NPN triode; the grid electrode of the second MOS tube Q4 is also connected with the output end of the lithium battery 6 through a second resistor R2.
When the switch key is pressed down, the grid electrode of the second MOS tube Q4 is grounded through the switch key, at the moment, the second MOS tube Q4 is conducted, the lithium battery 6 supplies power to the main control chip U1, the main control chip U1 is activated, meanwhile, the key detection end of the main control chip U1 is set low by the switch key, after the main control chip U1 receives the low setting signal, the second enabling end of the main control chip U1 outputs a high level to the base electrode of the second triode Q2, the second triode Q2 is conducted, the second MOS tube Q4 is continuously pulled down, and the lithium battery 6 is kept supplying power to the main control chip U1. At this time, no matter whether the start button SW1 is in a pressed state, the main control chip U1 can be continuously activated by supplying power to the lithium battery 6. After the main control chip U1 is activated, if an external power supply is connected at the moment, that is, if the input end of the power supply output module 3 is provided with a power supply input, the main control chip U1 receives the input voltage of the power supply end connected with the input port 2, the second enabling end outputs a low level to the base electrode of the second triode Q2, the second triode Q2 is turned off, the second MOS tube Q4 is set high, and the lithium battery 6 is disconnected to supply power to the main control chip U1. It should be noted that, in this embodiment, the main control chip U1 is provided with two power supply terminals, where the two power supply terminals are connected to the input port 2 and the output terminal of the lithium battery 6 respectively.
Preferably, the lithium battery output module 4 further comprises a boost module, the boost module is arranged between the output end of the switch assembly and the power supply end of the main control chip U1, the boost module comprises a boost control chip U3, the input end of the boost control chip U3 is connected with the output end of the switch assembly, and the output end is connected with the power supply end of the main control chip U1. The voltage boosted by the boosting module is 5V.
In this embodiment, as a preferred embodiment, the charging control module 5 further includes a charging indicator lamp D2, where an input end of the charging indicator lamp D2 is connected to the input port 2, and an output end is connected to the indication enabling port of the charging control module 5.
In order to better operation experience, the embodiment further provides a specific implementation manner, wherein in the implementation manner, the first MOS transistor Q3 and the second MOS transistor Q4 are PMOS transistors, and the first transistor Q1 and the second transistor Q2 are NPN transistors, wherein an output voltage of the input port 2 is 5V. The specific part selection and working flow are as follows:
in this embodiment, the input port 2 adopts a TYPE-C plug interface, is connected with a power supply of the USB interface, and is powered to the main control chip U1 in one path, and is powered to the charging chip U2 of the charging control module 5 in the other path, so as to charge the lithium battery 6, where the charging chip U2 is a TP4056 chip. Specifically, the control end CE of the charging chip U2 is controlled by the charging enable signal end of the main control chip U1, i.e., the GPIO port, and the voltage of the lithium battery 6 is divided by a resistor and then connected to the pin of the voltage detection port bat_det of the main control chip U1 for voltage detection.
When the external POWER supply is connected, and the external POWER supply and the lithium battery 6 supply POWER simultaneously, after the start button SW1 is pressed for 3 seconds, the button detection end POWEN_ON of the main control chip U1 is grounded, the second enabling end POWER_KEY of the main control chip U1 outputs a high voltage, and the high voltage is supplied to the base electrode of the second triode Q2 after passing through the current limiting resistor, so that the grid electrode of the second MOS tube Q4 is pulled down after the second triode Q2 is conducted, and the second MOS tube Q4 is conducted. The voltage of the lithium battery 6 flows from the source electrode to the drain electrode of the second MOS tube Q4, is supplied to the input end of the boost chip through the boost inductor after being subjected to capacitive filtering, and is output and supplied to the main control chip U1 through the output end of the boost chip after being boosted to 5V.
When the main control chip U1 is electrified to enter an initialization state, a high voltage is output from a first enabling end USB5V_EN of the main control to a base electrode of the first triode Q1, so that the first triode Q1 is pulled down to be conducted, a grid electrode of the first MOS tube Q3 is pulled down through R14, the first MOS tube Q3 is conducted, an external POWER supply is directly supplied to the main control chip, a second enabling end POWER_KEY of the main control chip U1 outputs a low voltage to a base electrode of the second triode Q2 again, the base electrode of the second triode Q2 is in an off state because no high voltage exists, a grid electrode of the second MOS tube Q4 is set to be high to be cut off, and the connection between an output end of the lithium battery 6 and a POWER supply end of the main control chip U1 is disconnected.
When the voltage detection port bat_det of the main control chip U1 detects that the voltage of the lithium battery 6 is lower than 3.7V, the charge enable signal terminal chg_en of the main control chip U1 outputs a high voltage to the control terminal CE of the charging chip U2, so that the charging chip U2 outputs a voltage to the lithium battery 6 for charging. When the lithium battery 6 is fully charged and the voltage reaches 4.1V, the voltage detection port bat_det of the main control chip U1 detects that the voltage of the lithium battery 6 is higher than 4.1V, and the charging enable signal terminal chg_en of the main control chip U1 outputs a low voltage to the control terminal CE of the charging chip U2, so that the charging chip U2 stops outputting.
Of course, as a preferred alternative, another specific operation mode is provided, in which when the lithium battery 6 is fully charged, that is, the battery voltage is higher than 4.1V, the pin chg_en of the charge enable signal terminal chg_en of the main control chip U1 outputs a low voltage, and the charging is stopped. Meanwhile, the USB5V_EN pin of the first enabling end outputs low voltage, the connection between an external POWER supply and the POWER supply end of the main control chip U1 is disconnected, the power_KEY of the second enabling end outputs high voltage to the base electrode of the second triode Q2 to pull down the grid electrode of the second MOS tube Q4, the second MOS tube Q4 is conducted, and the lithium battery 6 supplies POWER to the main control chip U1.
When the voltage detection port bat_det of the main control chip U1 detects that the battery voltage is lower than 3.7V, the first enabling terminal USB5v_en of the main control outputs a high voltage, the first triode Q1 is turned on, the gate of the first MOS transistor Q3 is pulled down, the external POWER supply is turned on to supply POWER to the main control chip, the second enabling terminal power_key outputs a low voltage to enable the second MOS transistor Q4 to be turned off, meanwhile, the charging enabling signal terminal chg_en of the main control chip U1 outputs a high voltage to the control terminal of the charging chip U2, the charging chip U2 works to charge the lithium battery 6, and the like. In this way, the present embodiment can effectively achieve an energy saving effect.
Example III
The embodiment provides an audio device, which includes a lithium battery 6 and a lithium battery overcharge-preventing switching circuit, wherein the lithium battery 6 is connected with an external power supply through the lithium battery overcharge-preventing switching circuit.
Specifically, the audio device of the present embodiment adopts the lithium battery overcharge-preventing switching circuit in the first embodiment or the second embodiment.
It is to be understood that the above examples of the present utility model are provided by way of illustration only and are not intended to limit the scope of the utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.
Claims (10)
1. The anti-overcharging switching circuit of the lithium battery is characterized by comprising a main control chip (1), an input port (2) for accessing external power supply voltage input, a power supply output module (3), a lithium battery output module (4) and a charging control module (5); the main control chip (1) comprises a power supply end, a key detection end for monitoring the action of a starting key SW1 of the lithium battery (6), an enabling module for controlling the output on-off of the power supply end and a charging enabling signal end for outputting a corresponding control signal according to the electric quantity of the lithium battery (6); the input end of the power output module (3) is connected with the input port (2), the output end of the power output module is connected with the power supply end of the main control chip (1), and the control end of the power output module is connected with the enabling end of the main control chip (1); the input end of the lithium battery output module (4) is connected with the output end of the lithium battery (6), the output end of the lithium battery output module is connected with the power supply end of the main control chip (1), and the control end of the lithium battery output module is connected with the enabling module of the main control chip (1) through a switch component; the charging control module (5) comprises a charging control chip and a charging port, the input end of the charging control chip is connected with the input port (2), the output end of the charging control chip is connected with the charging port of the lithium battery (6), and the control end of the charging control chip is connected with a charging enabling signal end which is used for outputting a corresponding control signal according to the electric quantity of the lithium battery (6) on the main control chip (1).
2. The overcharge-preventing switching circuit of a lithium battery according to claim 1, wherein the enabling module of the main control chip (1) comprises a first enabling end and a second enabling end, the first enabling end and the second enabling end switch signals according to input of a key detection end, the first enabling end is connected with a control end of the power output module (3), and the second enabling end is connected with a control end of the switch assembly.
3. The overcharge-preventing switching circuit of a lithium battery according to claim 2, wherein the power output module (3) comprises a first triode Q1 and a first MOS transistor Q3, a base electrode of the first triode Q1 is connected with the first enabling end, a collector electrode is connected with a gate electrode of the first MOS transistor Q3, and an emitter electrode is grounded; the source electrode of the first MOS tube Q3 is connected with the input port (2), and the drain electrode is connected with the power supply end of the main control chip (1).
4. The overcharge-preventing switching circuit of claim 3, wherein the first MOS transistor Q3 is a PMOS transistor and the first transistor Q1 is an NPN transistor; the grid electrode of the first MOS tube Q3 is also connected with the input port (2) through a first resistor R1.
5. The lithium battery overcharge-preventing switching circuit of claim 2, wherein the switching assembly comprises a second triode Q2, a second MOS transistor Q4, and a common cathode diode D1; the base electrode of the second triode Q2 is connected with the second enabling end, the collector electrode is connected with the grid electrode of the second MOS tube Q4, and the emitter electrode is grounded; the source electrode of the second MOS tube Q4 is connected with the output end of the lithium battery (6), and the drain electrode is connected with the power supply end of the main control chip (1); the first anode of the common cathode diode D1 is connected with the grid electrode of the second MOS tube Q4, the second anode is connected with the key detection end of the main control chip (1), and the common cathode is grounded by a key through a switch.
6. The overcharge-preventing switching circuit of claim 5, wherein the second MOS transistor Q4 is a PMOS transistor and the second transistor Q2 is an NPN transistor; the grid electrode of the second MOS tube Q4 is also connected with the output end of the lithium battery (6) through a second resistor R2.
7. The lithium battery overcharge-preventing switching circuit according to claim 1, wherein the lithium battery output module (4) further comprises a boost module, the boost module is arranged between the output end of the switch assembly and the power supply end of the main control chip (1), the boost module comprises a boost control chip U3, the input end of the boost control chip U3 is connected with the output end of the switch assembly, and the output end is connected with the power supply end of the main control chip (1).
8. The overcharge-preventing switching circuit of a lithium battery according to claim 1, wherein the charge control module (5) further comprises a charge indicator lamp D2, an input end of the charge indicator lamp D2 is connected to the input port (2), and an output end is connected to an indication enabling port of the charge control module (5).
9. The lithium battery overcharge-preventing switching circuit of claim 1, wherein the main control chip (1) further comprises a voltage detection port for monitoring the output voltage of the lithium battery (6), and the voltage detection port is connected with the output end of the switch assembly.
10. An audio device characterized by comprising a lithium battery (6) and the lithium battery overcharge-preventing switching circuit of any one of claims 1-9; the lithium battery (6) is connected with an external power supply through a lithium battery overcharge-preventing switching circuit, a first triode and a first MOS tube, the base electrode of the first triode is connected with the first enabling end, the collector electrode is connected with the grid electrode of the first MOS tube, and the emitter electrode is grounded; the source electrode of the first MOS tube is connected with the input port (2), and the drain electrode of the first MOS tube is connected with the power supply end of the main control chip (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321262640.0U CN219892997U (en) | 2023-05-23 | 2023-05-23 | Lithium battery overcharge-preventing switching circuit and audio equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321262640.0U CN219892997U (en) | 2023-05-23 | 2023-05-23 | Lithium battery overcharge-preventing switching circuit and audio equipment |
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| Publication Number | Publication Date |
|---|---|
| CN219892997U true CN219892997U (en) | 2023-10-24 |
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| CN202321262640.0U Active CN219892997U (en) | 2023-05-23 | 2023-05-23 | Lithium battery overcharge-preventing switching circuit and audio equipment |
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| Country | Link |
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| CN (1) | CN219892997U (en) |
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