CN218867955U - Battery charging and discharging protection circuit - Google Patents
Battery charging and discharging protection circuit Download PDFInfo
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- CN218867955U CN218867955U CN202223253482.0U CN202223253482U CN218867955U CN 218867955 U CN218867955 U CN 218867955U CN 202223253482 U CN202223253482 U CN 202223253482U CN 218867955 U CN218867955 U CN 218867955U
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Abstract
The utility model discloses a battery charge-discharge protection circuit, including the interface unit that charges, the module that charges, lithium electricity protection module, the module that discharges, power supply interface unit and host system, through including lithium electricity protection module, lithium electricity protection module is including preventing reverse connection unit, through prevent reverse connection unit, can prevent external discharge when the polarity of lithium cell is reversed, and circuit structure is simple, does not need detection circuitry and control circuit just can realize preventing reverse connection protection of battery, has avoided the consumer and the relevant circuit damage that is caused by host computer misoperation, and the user is safer when using; the lithium battery protection module comprises a lithium battery protection unit, and when the lithium battery is overcharged or overdischarged, the lithium battery protection unit can prevent the lithium battery from being damaged or shorten the service life of the lithium battery by cutting off a charging circuit or a discharging circuit; the utility model discloses a module of discharging, the module of discharging can be with the output voltage of lithium cell after rising to the power supply of outside consumer through the unit that steps up including the unit that steps up.
Description
Technical Field
The utility model relates to a protection circuit, in particular to battery charge-discharge protection circuit is applied to battery protection technical field.
Background
The lithium battery has the advantages of high power capacity, light power quality and the like as a conventional battery, so that the lithium battery is widely applied to portable mobile equipment such as a handheld small fan, a video player and an audio player. However, the service life of the lithium battery is affected by overcharge, overdischarge, discharge overcurrent, charge overcurrent and short circuit in the charge and discharge structure of the lithium battery, so that a charge and discharge protection circuit needs to be added to the lithium battery during the safety design to prevent the lithium battery from being subjected to potential dangers of over-high temperature, burning and even explosion caused by overcharge, overdischarge, discharge overcurrent, charge overcurrent and short circuit.
In the discharging process of the battery, the reverse prevention of the battery is a necessary function, and after the polarity of the battery is reversed, the phenomena that power supply and utilization equipment is burnt, components and parts are seriously heated and broken down, and even deflagration is caused in serious conditions can be caused.
The battery reverse-connection preventing circuit in the prior art generally comprises a detection circuit, a control circuit and a field effect transistor, wherein when the detection circuit detects that the battery is reversely connected, the control circuit sends out a low level to enable the field effect transistor to be in a turn-off state, and the battery is forbidden to discharge outwards. The circuit structure of the battery reverse-connection preventing circuit in the prior art is complex, and when the upper computer manages the control circuit, the situation that the battery discharges outwards due to the fact that the upper computer manages the control circuit to send low level when the upper computer is not operated, the field effect tube is forcibly conducted, and therefore electric equipment and related circuits are damaged exists.
Disclosure of Invention
The utility model provides a battery charge-discharge protection circuit, it is through including lithium electricity protection module, lithium electricity protection module is including preventing the reverse connection unit, through prevent preventing the reverse connection unit, can prevent to discharge when the polarity of lithium cell is reversed when connecting, and circuit structure is simple, does not need detection circuitry and control circuit just can realize preventing of battery from preventing the reverse connection protection, has avoided the consumer and the relevant circuit damage that are caused by upper computer misoperation, and the user is safer when using.
The utility model provides a technical scheme that its technical problem adopted is: the utility model provides a battery charge-discharge protection circuit, battery charge-discharge protection circuit is including the interface unit that charges, the module that charges, lithium electricity protection module, the module that discharges, power supply interface unit and host system, the power input end of the interface unit that charges can be connected with external power source, the power output end of the interface unit that charges with the power input end of the module that charges is connected, and lithium electricity protection module includes lithium cell, lithium electricity protection unit and prevents reverse connection unit, the power output end of the module that charges pass through lithium electricity protection unit with the power input end of lithium cell is connected, the power output end of lithium cell through preventing reverse connection unit and lithium electricity protection unit with the power input end of the module that discharges with host system's power input end is connected, host system's control signal output end and the control signal input end of the module that discharges are connected, the power output end and the power input end of the interface unit that supplies power of discharging are connected.
Further, the reverse connection preventing unit comprises a resistor R8, a resistor R11, a resistor R13, a resistor R14, a resistor R32, a low-level conducting switch element Q3 and a high-level conducting switch element Q4, one end of the resistor R8 is connected with the positive electrode of the lithium battery, the other end of the resistor R8 is connected with one end of the resistor R11, the other end of the resistor R11 is connected with the negative electrode of the power supply, the common end of the resistor R8 and the resistor R11 is connected with the control conducting end of the low-level conducting switch element Q3, the positive electrode of the lithium battery is also connected with the controlled conducting input end of the low-level conducting switch element Q3, the controlled conducting output end of the low-level conducting switch element Q3 is connected with one end of the resistor R13, the other end of the resistor R13 is connected with the control conducting end of the high-level conducting switch element Q4, the negative electrode of the lithium battery is connected with the controlled conducting input end of the high-level conducting switch transistor Q4, the controlled conducting output end of the high-level conducting switch transistor Q4 is connected with the ground end of the lithium battery protection unit, the negative electrode of the power supply is also connected with one end of the common conducting switch transistor R13 and the high-level conducting switch transistor R32.
Further, the lithium battery protection unit comprises a lithium battery protection chip U1, a high-level conduction switch element Q5A, a high-level conduction switch element Q5B, a resistor R7 and a resistor R16, the anode of the lithium battery is connected with one end of the resistor R7, the other end of the resistor R7 is connected with the power input end of the lithium battery protection chip U1, the first control end of the lithium battery protection chip U1 is connected with the control conduction end of the high-level conduction switch element Q5A, the second control end of the lithium battery protection chip U1 is connected with the control conduction end of the high-level conduction switch element Q5B, the cathode of the lithium battery is connected with the controlled conduction output end of the high-level conduction switch element Q5A, the conduction input end of the high-level conduction switch element Q5A is connected with the conduction input end of the high-level conduction switch element Q5B, the conduction output end of the high-level conduction switch element Q5B is grounded, the level end of the lithium battery protection chip U1 is connected with one end of the resistor R16, and the other end of the resistor R16 is grounded.
Further, the charging module comprises a discharging unit, a charging indicating unit and a current limiting unit, the power output end of the charging interface unit is connected with one end of the discharging unit, the other end of the discharging unit is grounded, the power output end of the charging interface module is connected with the power input end of the charging indicating unit, the power output end of the charging indicating unit is connected with the negative electrode of the lithium battery, the power output end of the charging interface module is further connected with the power input end of the current limiting unit, and the power output end of the current limiting unit is connected with the positive electrode of the lithium battery.
Further, the bleeder unit is a bleeder resistor R4.
Further, the charging indicating unit comprises a resistor R3, a resistor R5 and a light emitting diode D3, a power output interface of the charging interface module is connected with one end of the resistor R3, the other end of the resistor R3 is connected with the anode of the light emitting diode D3, the other end of the light emitting diode D3 is connected with the cathode of the lithium battery, the common end of the resistor R3 and the light emitting diode D3 is connected with one end of the resistor R5, and the other end of the resistor R5 is connected with the cathode of the light emitting diode D3.
Further, the current-limiting unit includes resistance R1, resistance R2 and diode D1, and the power output of the interface module that charges is connected with resistance R1's one end, and resistance R1's the other end is connected with the positive pole of diode, and the power output of the interface module that charges still is connected with resistance R2's one end, and resistance R2's the other end is connected with diode D1's positive pole, and diode D1's the other end is connected with the positive pole of lithium cell.
Further, the module of discharging including the unit and turn-off unit of stepping up, the lithium cell the positive pole with the power input end of the unit that steps up is connected, and host system's control signal output part is connected with the control signal input part of the unit that steps up, and the power output part of the unit that steps up is connected with the power input part of power supply interface unit, and the power output part of power supply interface unit is connected with the power input part of turn-off unit, and control module's control signal output part is connected with the control signal input part of turn-off unit, and the power output part of turn-off unit is ground connection.
Furthermore, the boosting unit comprises an inductor L1, a diode D2, a capacitor C1, a capacitor CY1 and a high-level conduction switch transistor Q1, the positive electrode of the lithium battery is connected with one end of the inductor L1, the other end of the inductor L1 is connected with the controlled conduction input end of the high-level conduction switch transistor Q1, the control signal output end of the main control module is connected with the control conduction end of the high-level conduction switch transistor Q1, the controlled conduction output end of the high-level conduction switch transistor Q1 is grounded, the common end of the inductor L1 and the high-level conduction switch transistor Q1 is connected with the positive electrode of the diode D2, the other end of the diode D2 is connected with one end of the capacitor C1, the other end of the capacitor C1 is grounded, the common end of the diode D2 and the capacitor C1 is connected with one end of the capacitor CY1, the other end of the capacitor CY1 is grounded, and the common end of the capacitor C1 and the capacitor CY1 are connected with the power supply input end of an external load.
Further, the turn-off unit comprises a diode D4, a capacitor C3, a resistor R6 and a high level conduction switch transistor Q2, a power output end of an external load is connected with a controlled conduction input end of the high level conduction switch transistor Q2, a controlled conduction output end of the high level conduction switch transistor Q2 is grounded, a control signal output end of the main control module is connected with an anode of the diode D4, a cathode of the diode D4 is connected with a controlled conduction end of the high level conduction switch transistor, a common end of the diode D4 and the high level conduction switch transistor Q2 is connected with one end of the capacitor C3, the other end of the capacitor C3 is grounded, a common end of the diode D4 and the high level conduction switch transistor Q2 is also connected with one end of the resistor R6, and the other end of the resistor R6 is grounded.
The utility model has the advantages that: the utility model provides a battery charge-discharge protection circuit, through including lithium electricity protection module, lithium electricity protection module is including preventing reverse connection unit, through prevent reverse connection unit, can prevent the external discharge when the polarity of lithium cell is reversed, and circuit structure is simple, does not need detection circuitry and control circuit just can realize preventing reverse connection protection of battery, has avoided the consumer and the relevant circuit damage that cause by host computer misoperation, and the user is safer when using; the lithium battery protection module comprises a lithium battery protection unit, and when the lithium battery is overcharged or overdischarged, the lithium battery protection unit can prevent the lithium battery from being damaged or shorten the service life of the lithium battery by cutting off a charging circuit or a discharging circuit; the utility model comprises a charging module, wherein the charging module comprises a discharge unit, and when the lithium battery is charged by the discharge unit, the discharge unit can avoid the situation that the power adapter socket is not a charging port but is pulled out, thereby causing the false charging to delay the light-off; the utility model comprises a discharging module, wherein the discharging module comprises a boosting unit, and the boosting unit can boost the output voltage of a lithium battery and then supply power to external electric equipment; the utility model also comprises a filtering unit, which can ensure the stability of the output voltage of the lithium battery; the utility model discloses still include the pilot lamp module, the pilot lamp module can show current charge-discharge state, and convenience of customers watches.
Drawings
Fig. 1 is a circuit block diagram of a battery charging/discharging protection circuit provided by the present invention;
fig. 2 is a schematic circuit diagram of the charging interface unit and the charging module provided by the present invention;
fig. 3 is a schematic circuit diagram of a lithium battery management module provided by the present invention;
fig. 4 is a schematic circuit diagram of a discharging module and a power supply interface module provided by the present invention;
fig. 5 is a schematic circuit diagram of the main control module provided by the present invention;
fig. 6 is a schematic circuit diagram of the indicator light module provided by the present invention.
Detailed Description
In order to make the purpose, technical solution and effect of the present invention clearer and clearer, the following description refers to the accompanying drawings and examples to further explain the present invention in detail. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Referring to fig. 1-6, the present invention provides a battery charging/discharging protection circuit.
In this embodiment, battery measurement protection circuit is including the interface unit that charges, the module that charges, lithium electricity protection module, the module that discharges, power supply interface unit and host system, the utility model provides an interface unit that charges includes the USB interface, can sample other kinds of interfaces such as type-c interface, lightning interface certainly, the power input end of the interface unit that charges can be connected with external power source, and external power source can be through the interface unit that charges to the lithium cell, and power supply interface unit can be connected with outside consumer, and the lithium cell can supply power to outside consumer through power supply interface unit. The power output end of the charging interface unit is connected with the power input end of the charging module, the lithium battery protection module comprises a lithium battery, a lithium battery protection unit and an anti-reverse connection unit, the power output end of the charging module is connected with the power input end of the lithium battery through the lithium battery protection unit, the power output end of the lithium battery is connected with the power input end of the discharging module and the power input end of the main control module through the anti-reverse connection unit and the lithium battery protection unit, the control signal output end of the main control module is connected with the control signal input end of the discharging module, and the power output end of the discharging module is connected with the power input end of the power supply interface unit.
In this embodiment, the reverse connection preventing unit includes a resistor R8, a resistor R11, a resistor R13, a resistor R14, a resistor R32, a low-level conducting switch element Q3, and a high-level conducting switch element Q4, one end of the resistor R8 is connected to an anode of the lithium battery, the other end of the resistor R8 is connected to one end of the resistor R11, the other end of the resistor R11 is connected to a cathode of the power supply, a common end of the resistor R8 and the resistor R11 is connected to a controlling conducting end of the low-level conducting switch element Q3, an anode of the lithium battery is further connected to a controlled conducting input end of the low-level conducting switch element Q3, a controlled conducting output end of the low-level conducting switch element Q3 is connected to one end of the resistor R13, the other end of the resistor R13 is connected to a controlling conducting end of the high-level conducting switch element Q4, a cathode of the lithium battery is connected to a controlled conducting input end of the high-level conducting switch transistor Q4, a controlled conducting output end of the high-level conducting switch transistor Q4 is connected to a ground terminal of the lithium battery protection unit, a cathode of the power supply is further connected to one end of the resistor R14, the resistor R14 and the other end of the resistor R32 are connected to the common end of the high-level conducting switch transistor R13 and the high-level conducting switch transistor R4.
In this embodiment, the low-level conduction switch element Q3 is a PNP type triode, the controlled conduction input end of the low-level conduction switch element Q3 is an emitter of the PNP type triode, the controlled conduction output end of the low-level conduction switch element Q3 is a collector of the PNP type triode, the controlled conduction end of the low-level conduction switch element Q3 is a base of the PNP type triode, the high-level conduction switch element Q4 is an NMOS transistor, the controlled conduction input end of the high-level conduction switch element Q4 is a drain of the NMOS transistor, the controlled conduction output end of the high-level conduction switch element Q4 is a source of the NMOS transistor, and the controlled conduction end of the high-level conduction switch element Q4 is a gate of the NMOS transistor. Of course, the low-level conducting switch element Q3 and the high-level conducting switch element Q4 may also use other types of switch transistors such as NPN transistors or PMOS transistors to achieve the same effect.
In this embodiment, when a lithium battery is normally placed and discharged, the resistor R8 and the resistor R11 are voltage dividing resistors, and voltages below 1.04V are respectively obtained, at this time, the base of the low-level conduction switch element Q3 is at a low level, the low-level conduction switch element Q3 is in a conduction state, the positive voltage of the lithium battery reaches the ground terminal of the lithium battery protection unit through the controlled conduction output terminal of the low-level conduction switch element Q3 and the resistor R13, the positive voltage of the control conduction terminal of the high-level conduction switch element Q4 is given to the positive voltage of the control conduction terminal of the high-level conduction switch element Q4, and the controlled conduction output terminal of the high-level conduction switch element Q4 is connected with the ground terminal of the lithium battery protection unit, at this time, the ground terminal voltage of the lithium battery protection unit is 0.6V, at this time, the voltage difference between the control conduction terminal of the high-level conduction switch element Q4 and the controlled conduction output terminal of the high-level conduction switch element Q4 is greater than 3V, it is ensured that the high-level conduction switch element Q4 is in a conduction state, and the negative electrode of the lithium battery is connected with the controlled conduction input terminal of the high-level conduction switch transistor Q4 to form a closed loop, thereby ensuring that the circuit normally works; when the positive electrode and the negative electrode of the lithium battery are reversely connected, the positive electrode of the lithium battery provides a bias voltage for the controlled conduction output end of the high-level conduction switching transistor Q4 through the resistor R14 and the resistor R32, at the moment, the voltage of the controlled conduction end of the high-level conduction switching transistor Q4 is equal to that of the controlled conduction output end of the high-level conduction switching transistor Q4, the high-level conduction switching transistor Q4 is in a cut-off state, a loop is disconnected, and damage to components and external electric equipment of the circuit due to reverse connection of the battery is avoided.
In this embodiment, the lithium protection unit includes a lithium protection chip U1, a high-level conducting switch element Q5A, a high-level conducting switch element Q5B, a resistor R7, and a resistor R16, the lithium protection chip U1 of the present invention is a lithium protection chip of DW01 model, and other types of lithium protection chips may be used; the utility model adopts NMOS tube with model S8205A for middle and high level switch-on switch element Q5A and Q5B, and NMOS tube or PMOS tube with other model can be used for high level switch-on switch element Q5A and Q5B to achieve the same effect; the positive electrode of the lithium battery is connected with one end of a resistor R7, the other end of the resistor R7 is connected with the power input end of a lithium battery protection chip U1, the first control end of the lithium battery protection chip U1 is connected with the control conduction end of a high-level conduction switch element Q5A, the second control end of the lithium battery protection chip U1 is connected with the control conduction end of the high-level conduction switch element Q5B, the negative electrode of the lithium battery is connected with the controlled conduction output end of the high-level conduction switch element Q5A, the conduction input end of the high-level conduction switch element Q5A is connected with the conduction input end of the high-level conduction switch element Q5B, the conduction output end of the high-level conduction switch element Q5B is grounded, the level detection end of the lithium battery protection chip U1 is connected with one end of a resistor R16, and the other end of the resistor R16 is grounded; when the lithium battery is overcharged or overdischarged, the lithium battery protection chip U1 can cut off the charging loop or the discharging loop by controlling the high-level on-off element Q5A and the high-level on-off element Q5B, so as to prevent the lithium battery from being damaged or shorten the service life of the lithium battery.
In this embodiment, the module of charging is including the unit of bleeding, charge indicating unit and current-limiting unit, the unit of bleeding is bleeder resistance R4, and the power output end of the interface unit that charges is connected with bleeder resistance R4's one end, and bleeder resistance R4's other end ground connection can avoid appearing the lithium cell when charging through bleeder resistance R4, and the power adapter socket of not charging the port but pulling out of pulling out to the pseudo-charging time delay that arouses goes out the light.
In this embodiment, the charging indication unit includes a resistor R3, a resistor R5, and a light emitting diode D3, a power output interface of the charging interface module is connected to one end of the resistor R3, the other end of the resistor R3 is connected to an anode of the light emitting diode D3, the other end of the light emitting diode D3 is connected to a cathode of the lithium battery, a common end of the resistor R3 and the light emitting diode D3 is connected to one end of the resistor R5, the other end of the resistor R5 is connected to a cathode of the light emitting diode D3, the resistor R3 and the resistor R5 are divider resistors, the light emitting diode D3 is turned on when the input voltage is greater than 3.6V, the light emitting diode D3 is turned off when the input voltage is less than 3.6V, and a user can watch whether the lithium battery is in a charging state through the charging indication unit.
In this embodiment, the current limiting unit includes a resistor R1, a resistor R2, and a diode D1, the power output end of the charging interface module is connected to one end of the resistor R1, the other end of the resistor R1 is connected to the anode of the diode, the power output end of the charging interface module is also connected to one end of the resistor R2, the other end of the resistor R2 is connected to the anode of the diode D1, and the other end of the diode D1 is connected to the anode of the lithium battery; diode D1 is for preventing anti-restriction of turning back, avoid the battery to supply power for power adapter in the reverse direction, resistance R1 and resistance R2's resistance is 3 omega, parallelly connected 1.5 omega, guarantee that charging current is less than 1.3A, and utilize lithium electricity protection chip U1's protection mechanism, when lithium cell voltage is below 3.0V, lithium electricity protection chip U1 is the undervoltage protection state, can only charge the lithium cell with the undercurrent, when lithium cell voltage is greater than 3.0V, lithium electricity protection chip U1 normally opens, charge to the lithium cell with 1.33A electric current, and reduce charging current along with lithium cell voltage lifting, until lithium cell voltage is 4.2V, lithium electricity protection chip U1 is the overvoltage protection state, close the charging channel of lithium cell, charging current is 0.
In this embodiment, the discharging module includes a boosting unit and a turn-off unit, the boosting unit includes an inductor L1, a diode D2, a capacitor C1, a capacitor CY1 and a high-level turn-on switching transistor Q1, the output voltage of the lithium battery can be boosted by the boosting unit to supply power to an external electric device, the high-level turn-on switching element Q1 employs an NMOS transistor, a controlled turn-on input end of the high-level turn-on switching element Q1 is a drain electrode of the NMOS transistor, a controlled turn-on output end of the high-level turn-on switching element Q1 is a source electrode of the NMOS transistor, and a controlled turn-on end of the high-level turn-on switching element Q1 is a gate electrode of the NMOS transistor; of course, the high-level turn-on switching element Q1 may also use other types of switching transistors such as PMOS transistors to achieve the same effect.
In this embodiment, the positive electrode of the lithium battery is connected to one end of the inductor L1, the other end of the inductor L1 is connected to the controlled conduction input end of the Q1 of the high-level conduction switching transistor, the control signal output end of the main control module is connected to the controlled conduction end of the Q1 of the high-level conduction switching transistor, the controlled conduction output end of the Q1 of the high-level conduction switching transistor is grounded, the common end of the inductor L1 and the Q1 of the high-level conduction switching transistor is connected to the positive electrode of the diode D2, the other end of the diode D2 is connected to one end of the capacitor C1, the other end of the capacitor C1 is grounded, the common end of the capacitor C1 and the common end of the capacitor C1 are connected to the positive electrode of the external load, when the lithium battery is in a discharging state, the main control module can fixedly output a boost unit switching signal with a frequency of 200KHz, when the control signal output end of the main control module outputs a high level to turn on the Q1 of the high-level conduction switching transistor, the output power supply makes the high-level conduction switching transistor Q1 of the magnetic energy switching transistor form a magnetic energy loop, when the lithium battery is in a lithium battery output voltage loop, the lithium battery is converted into a lithium battery energy storage circuit, and the lithium battery output circuit, and the lithium battery is converted into a lithium battery output circuit, and the lithium battery with the lithium battery output circuit, and the lithium battery control circuit, and the lithium battery.
In this embodiment, the turn-off unit includes a diode D4, a capacitor C3, a resistor R6, and a high-level turn-on switch transistor Q2, the high-level turn-on switch transistor Q2 is an NMOS transistor, a controlled turn-on input end of the high-level turn-on switch transistor Q2 is a drain of the NMOS transistor, a controlled turn-on output end of the high-level turn-on switch transistor Q2 is a source of the NMOS transistor, and a controlled turn-on end of the high-level turn-on switch transistor Q2 is a gate of the NMOS transistor; of course, the high-level turn-on switching element Q2 may also use other types of switching transistors such as PMOS transistor to achieve the same effect.
In this embodiment, a power output end of an external load is connected with a controlled conduction input end of a high-level conduction switch transistor Q2, a controlled conduction output end of the high-level conduction switch transistor Q2 is grounded, a control signal output end of a main control module is connected with an anode of a diode D4, a cathode of the diode D4 is connected with a control conduction end of the high-level conduction switch transistor, a common end of the diode D4 and the high-level conduction switch transistor Q2 is connected with one end of a capacitor C3, the other end of the capacitor C3 is grounded, a common end of the diode D4 and the high-level conduction switch transistor Q2 is also connected with one end of a resistor R6, and the other end of the resistor R6 is grounded; master module can fix output frequency 200 KHz's signal to diode D4's positive pole, diode D4 is for preventing anti-reverse diode, prevent that the shutoff unit from causing the influence to the unit that steps up, electric capacity C3 is for shutting off delay capacitance, store the electric energy when the unit normal work of stepping up and duty cycle are high, when the duty cycle is low, the short-lived is that high level switches on switching transistor Q2 and provides enabling voltage, guarantee that high level switches on switching transistor Q2 and switches on, when the unit stop work that steps up, electric charge in the electric capacity is released through resistance R6 fast, the problem that corresponds too slow when avoiding appearing shutting down.
In this embodiment, the utility model also includes a filtering unit, which is a filtering capacitor C2, the anode of the lithium battery is connected with one end of the filtering capacitor, and the other end of the filtering capacitor C2 is grounded; the output voltage of the lithium battery can be ensured to be stable through the filtering unit; the utility model discloses still include the pilot lamp module, host system's control signal output part is connected with the control signal input of pilot lamp module, and through host system to the control of pilot lamp module, the current charge-discharge state can be shown to the pilot lamp module, and convenience of customers watches.
It is to be understood that the invention is not limited to the above-described embodiments, and that modifications and variations may be made by those skilled in the art in light of the above teachings, and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (10)
1. A battery charge and discharge protection circuit is characterized in that: the battery charging and discharging protection circuit comprises a charging interface unit, a charging module, a lithium battery protection module, a discharging module, a power supply interface unit and a main control module, wherein the power input end of the charging interface unit can be connected with an external power supply, the power output end of the charging interface unit is connected with the power input end of the charging module, the lithium battery protection module comprises a lithium battery, a lithium battery protection unit and an anti-reverse-connection unit, the power output end of the charging module is connected with the power input end of the lithium battery through the lithium battery protection unit, the power output end of the lithium battery is connected with the power input end of the discharging module through the anti-reverse-connection unit and the lithium battery protection unit and the power input end of the main control module, the control signal output end of the main control module is connected with the control signal input end of the discharging module, and the power output end of the discharging module is connected with the power input end of the power supply interface unit.
2. The battery charging and discharging protection circuit according to claim 1, wherein: the reverse connection preventing unit comprises a resistor R8, a resistor R11, a resistor R13, a resistor R14, a resistor R32, a low-level conducting switch element Q3 and a high-level conducting switch element Q4, one end of the resistor R8 is connected with the positive electrode of the lithium battery, the other end of the resistor R8 is connected with one end of the resistor R11, the other end of the resistor R11 is connected with the negative electrode of a power supply, the common end of the resistor R8 and the resistor R11 is connected with the control conducting end of the low-level conducting switch element Q3, the positive electrode of the lithium battery is also connected with the controlled conducting input end of the low-level conducting switch element Q3, the controlled conducting output end of the low-level conducting switch element Q3 is connected with one end of the resistor R13, the other end of the resistor R13 is connected with the control conducting end of the high-level conducting switch element Q4, the negative electrode of the lithium battery is connected with the controlled conducting input end of the high-level conducting switch transistor Q4, the controlled conducting output end of the high-level conducting switch transistor Q4 is connected with the grounding end of the lithium battery protection unit, the negative electrode of the power supply is also connected with one end of the resistor R14, the resistor R13 and the other end of the high-level conducting switch transistor R32 are connected with the common end of the high-level conducting switch transistor R4, and the high-level conducting switch element R13.
3. The battery charging and discharging protection circuit according to claim 1, wherein: the lithium electric protection unit comprises a lithium electric protection chip U1, a high-level conduction switch element Q5A, a high-level conduction switch element Q5B, a resistor R7 and a resistor R16, the anode of the lithium battery is connected with one end of the resistor R7, the other end of the resistor R7 is connected with the power input end of the lithium electric protection chip U1, the first control end of the lithium electric protection chip U1 is connected with the control conduction end of the high-level conduction switch element Q5A, the second control end of the lithium electric protection chip U1 is connected with the control conduction end of the high-level conduction switch element Q5B, the cathode of the lithium battery is connected with the controlled conduction output end of the high-level conduction switch element Q5A, the conduction input end of the high-level conduction switch element Q5A is connected with the conduction input end of the high-level conduction switch element Q5B, the conduction output end of the high-level conduction switch element Q5B is grounded, the level detection end of the lithium electric protection chip U1 is connected with one end of the resistor R16, and the other end of the resistor R16 is grounded.
4. The battery charging and discharging protection circuit according to claim 1, wherein: the charging module comprises a discharging unit, a charging indicating unit and a current limiting unit, a power output end of the charging interface unit is connected with one end of the discharging unit, the other end of the discharging unit is grounded, a power output end of the charging interface module is connected with a power input end of the charging indicating unit, a power output end of the charging indicating unit is connected with a negative electrode of the lithium battery, a power output end of the charging interface module is connected with a power input end of the current limiting unit, and a power output end of the current limiting unit is connected with a positive electrode of the lithium battery.
5. The battery charging and discharging protection circuit according to claim 4, wherein: the bleeder unit is a bleeder resistor R4.
6. The battery charging and discharging protection circuit according to claim 4, wherein: the charging indicating unit comprises a resistor R3, a resistor R5 and a light-emitting diode D3, a power output interface of the charging interface module is connected with one end of the resistor R3, the other end of the resistor R3 is connected with the anode of the light-emitting diode D3, the other end of the light-emitting diode D3 is connected with the cathode of the lithium battery, the public ends of the resistor R3 and the light-emitting diode D3 are connected with one end of the resistor R5, and the other end of the resistor R5 is connected with the cathode of the light-emitting diode D3.
7. The battery charging and discharging protection circuit according to claim 4, wherein: the current-limiting unit includes resistance R1, resistance R2 and diode D1, and the power output end of the interface module that charges is connected with resistance R1's one end, and resistance R1's the other end is connected with the positive pole of diode, and the power output end of the interface module that charges still is connected with resistance R2's one end, and resistance R2's the other end is connected with diode D1's positive pole, and diode D1's the other end is connected with the positive pole of lithium cell.
8. The battery charging and discharging protection circuit according to claim 1, wherein: the discharging module comprises a boosting unit and a turn-off unit, the positive pole of the lithium battery is connected with the power input end of the boosting unit, the control signal output end of the main control module is connected with the control signal input end of the boosting unit, the power output end of the boosting unit is connected with the power input end of the power supply interface unit, the power output end of the power supply interface unit is connected with the power input end of the turn-off unit, the control signal output end of the control module is connected with the control signal input end of the turn-off unit, and the power output end of the turn-off unit is grounded.
9. The battery charging and discharging protection circuit according to claim 8, wherein: the boosting unit comprises an inductor L1, a diode D2, a capacitor C1, a capacitor CY1 and a high-level conduction switch transistor Q1, the anode of the lithium battery is connected with one end of the inductor L1, the other end of the inductor L1 is connected with the controlled conduction input end of the Q1 of the high-level conduction switch transistor, the control signal output end of the main control module is connected with the controlled conduction end of the high-level conduction switch transistor Q1, the controlled conduction output end of the high-level conduction switch transistor Q1 is grounded, the common end of the inductor L1 and the high-level conduction switch transistor Q1 is connected with the anode of the diode D2, the other end of the diode D2 is connected with one end of the capacitor C1, the other end of the capacitor C1 is grounded, the common end of the diode D2 and the capacitor C1 is connected with one end of the capacitor CY1, the other end of the capacitor CY1 is grounded, and the common end of the capacitor C1 and the power supply input end of an external load are connected.
10. The battery charging and discharging protection circuit according to claim 8, wherein: the turn-off unit comprises a diode D4, a capacitor C3, a resistor R6 and a high level conduction switch transistor Q2, a power supply output end of an external load is connected with a controlled conduction input end of the high level conduction switch transistor Q2, a controlled conduction output end of the high level conduction switch transistor Q2 is grounded, a control signal output end of the main control module is connected with an anode of the diode D4, a cathode of the diode D4 is connected with a control conduction end of the high level conduction switch transistor, a common end of the diode D4 and the high level conduction switch transistor Q2 is connected with one end of the capacitor C3, the other end of the capacitor C3 is grounded, a common end of the diode D4 and the high level conduction switch transistor Q2 is also connected with one end of the resistor R6, and the other end of the resistor R6 is grounded.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223253482.0U CN218867955U (en) | 2022-12-06 | 2022-12-06 | Battery charging and discharging protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223253482.0U CN218867955U (en) | 2022-12-06 | 2022-12-06 | Battery charging and discharging protection circuit |
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| CN218867955U true CN218867955U (en) | 2023-04-14 |
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| CN202223253482.0U Active CN218867955U (en) | 2022-12-06 | 2022-12-06 | Battery charging and discharging protection circuit |
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