CN104218648A - Charging and discharging protection circuit and charging and discharging system - Google Patents

Charging and discharging protection circuit and charging and discharging system Download PDF

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Publication number
CN104218648A
CN104218648A CN201410494392.1A CN201410494392A CN104218648A CN 104218648 A CN104218648 A CN 104218648A CN 201410494392 A CN201410494392 A CN 201410494392A CN 104218648 A CN104218648 A CN 104218648A
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China
Prior art keywords
charge
module
discharge
rechargeable battery
voltage
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CN201410494392.1A
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Chinese (zh)
Inventor
梁化春
刘义刚
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Suzhou Bei'ang Technology Co Ltd
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Suzhou Bei'ang Technology Co Ltd
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Priority to CN201410494392.1A priority Critical patent/CN104218648A/en
Publication of CN104218648A publication Critical patent/CN104218648A/en
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Abstract

An embodiment of the invention provides a charging and discharging protection circuit and a charging and discharging system. The protection circuit comprises a charging management module, a driving module and a charging and discharging protection module. The driving module is respectively connected with the charging management module and the charging and discharging protection module. The driving module and the charging and discharging protection module are connected with a rechargeable battery. The charging management module is externally connected with a charging power supply and used for adjusting output voltage of the charging power supply to be a preset charging voltage and adjusting an output current of the charging power supply to be a preset charging current. The charging and discharging protection module is used for detecting the charging voltage and voltage of the rechargeable battery and controlling the driving module to be on or off according to the detected voltage. The driving module has an on state or an off state. When the driving module is in the on state, the rechargeable battery can perform charging and discharging; and the driving module is in the off state, the rechargeable battery stops charging and discharging.

Description

A kind of charge-discharge protection circuit and charge-discharge system
Technical field
The present invention relates to technical field of electricity, particularly a kind of charge-discharge protection circuit and charge-discharge system.
Background technology
Current, lithium battery is applied in the middle of electronic product widely.Because lithium battery has long service life, safe, fast, the memoryless effect of the speed that discharges and recharges, many advantages such as volume is little and capacity is large, economic environmental protection, so be storage battery ideal in electronic product at this stage.
It is different that but the current specification of lithium battery is on the market varied, relevant parameter---especially standard charging voltage---.Corresponding charger is of a great variety equally.General manufacturer can be all the special charger of its cell arrangement of dispatching from the factory.On stricti jurise, due to the difference of standard charging voltage, the different batteries in other words charger of different electronic products are uncurrent often.
Meanwhile, for guaranteeing the useful life of battery and using safety, in design, tend to arrange charge protection loop in the charger of battery, to avoid overcharging of battery; At battery itself, discharge prevention loop is set, to avoid over-discharge can.That is to say, charge protection loop and discharge prevention loop are divided and are arranged, and only have the special charger of utilization to charge to battery, could bring into play more fully the effect in charge protection loop and discharge prevention loop.This has further affected the versatility of charger.
Also exist a part of user to have the custom of mixed charger; but mixed charger can make the standard charging voltage of charger output voltage and battery not be inconsistent; and charge protection loop and discharge prevention loop cannot fully play a role, probably have influence on the useful life of battery and use safety.
Therefore, those skilled in the art need to provide a kind of charge-discharge protection circuit, can receive the power supply of various charger outputs, reduce the dependence of terminal equipment to different model charger, and the fail safe that further improves charge and discharge process in terminal equipment.
Summary of the invention
In view of this; the object of the present invention is to provide a kind of charge-discharge protection circuit and charge-discharge system; the power supply that can receive various charger outputs, reduces the dependence of terminal equipment to different model charger, and takes into account and integrated charge protection and discharge prevention.
For achieving the above object, the present invention has following technical scheme:
The embodiment of the present invention provides a kind of charge-discharge protection circuit, and described protective circuit comprises: charge management module, driver module and charge and discharge protecting module;
The first end of described driver module connects the output of described charge management module; The second end of described driver module connects described rechargeable battery; The control end of described driver module connects described charge and discharge protecting module;
The input of described charge management module connects charge power supply;
Described charge management module, exports for the output voltage of charge power supply is adjusted to default charging voltage, and the output current of described charge power supply is adjusted to default charging current exports;
Described charge and discharge protecting module, for detecting the described charging voltage of described charge management module output and the voltage of described rechargeable battery, and according to driver module conducting or disconnection described in the voltage control of the described charging voltage detecting and rechargeable battery;
Described driver module, has conducting state or off-state, and described driver module is in conducting state, and described rechargeable battery discharges and recharges; Described driver module is in off-state, and described rechargeable battery stops discharging and recharging.
Preferably, described charge and discharge protecting module is controlled described driver module conducting or disconnection, is specially:
Described charge and discharge protecting module detects described charging voltage while being greater than the voltage of described rechargeable battery, and for controlling described driver module conducting, described charge management module is that described rechargeable battery charges;
The voltage that described charge and discharge protecting module detects described rechargeable battery during higher than default overcharged voltage threshold value, disconnects for controlling described driver module, and described charge management module stops charging for described rechargeable battery;
When the voltage that described charge and discharge protecting module detects described rechargeable battery is pressed threshold value lower than default overdischarge, for controlling described driver module, disconnect, described rechargeable battery stops electric discharge.
Preferably, described driver module comprises the first gate-controlled switch and the second gate-controlled switch;
The first end of described the first gate-controlled switch is as the first end of described driver module, and the second end of described the first gate-controlled switch connects the first end of described the second gate-controlled switch;
The second end of described the second gate-controlled switch is as the second end of described driver module;
The control end of the control end of described the first gate-controlled switch and the second gate-controlled switch is all connected described charge and discharge protecting module.
Preferably, described charge power supply is charger, and described charge management module for connecting the charger of different output voltages, and is adjusted to default charging voltage by described output voltage.
Preferably, also comprise Schottky diode;
The output of described charge management module connects the negative electrode of described Schottky diode, the plus earth of described Schottky diode.
Preferably, also comprise the first filter inductance, the first filter capacitor, the second filter capacitor, the first resistance and the first current-limiting resistance;
The output of described charge management module is connected the input of described driver module by described first filter inductance of series connection with the first current-limiting resistance;
The input of described driver module is by described the first filter capacitor ground connection;
The output of described charge management module is by described the first resistance and the second filter capacitor ground connection of series connection.
Preferably, also comprise: the first sampling resistor and the second sampling resistor;
Described the first sampling resistor is set between described driver module and described charge management module;
Described charge and discharge protecting module is detected described charging voltage by described the first sampling resistor;
Described the second sampling resistor is set between described charge and discharge protecting module and described rechargeable battery;
Described charge and discharge protecting module is detected the voltage of described rechargeable battery by this second sampling resistor.
Preferably, described charge and discharge protecting module is controlled after described driver module disconnection, described charge management module and rechargeable battery detected and disconnects, and controls described driver module conducting, so that described rechargeable battery starts electric discharge.
The embodiment of the present invention also provides a kind of charge-discharge system, and this system comprises: charge power supply and terminal equipment:
In this terminal equipment, have rechargeable battery and charge-discharge protection circuit, wherein, described charge-discharge protection circuit is described charge-discharge protection circuit.
Preferably, described charge power supply is charger, and described terminal equipment is corpuscular counter, has rechargeable battery and charge-discharge protection circuit in this corpuscular counter, and this corpuscular counter charges to this rechargeable battery by this charger.
As seen through the above technical solutions, there is following beneficial effect in the present invention:
By charge management module, the charging current in the certain voltage interval of various common charger outputs is adjusted into the direct current of normal voltage, thereby common batteries only need be combined with described charge-discharge protection circuit, and the charger of available different model charges; And compatible charge protection and discharge prevention function, further improved the adaptability of battery to charger in charge and discharge protecting module, the charging that makes battery is Portable safety more; And in prior art, be that charge protector is set in charger; discharge protection circuit is set in terminal equipment; terminal equipment only can be applicable to special-purpose charger like this, and in scheme provided by the invention, charge-discharge protection circuit is arranged in terminal equipment; terminal equipment has comprised charge management module; charge and discharge protecting module, therefore, terminal equipment has had the function that regulates charging voltage charging current and charge and discharge protecting; go for various chargers, versatility is provided.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the schematic diagram of charge-discharge protection circuit embodiment mono-described in the embodiment of the present invention;
Fig. 2 is the schematic diagram of charge-discharge protection circuit embodiment bis-described in the embodiment of the present invention;
Fig. 3 is the structural representation of charge-discharge system embodiment mono-described in the embodiment of the present invention.
Embodiment
For making object, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The voltage of the charging current of current common charger output is generally within the interval of 9V~17V, and the standard charging voltage of battery is only that unique value or scope are very little, so common batteries can not adapt to multiple different charger.
The invention provides a kind of charge-discharge protection circuit, described charge-discharge protection circuit can be arranged in terminal equipment, uses with together with common battery, and battery connects various types of common chargers of present stage by this charge-discharge protection circuit.By described charge-discharge protection circuit, the direct current of the certain voltage scope of common charger output can be converted to the direct current that meets this battery standard charging voltage; If so battery combines described charge-discharge protection circuit, just can connect various types of chargers and carry out safe charging.
Charge-discharge protection circuit embodiment mono-:
Referring to Fig. 1, this figure is the schematic diagram of charge-discharge protection circuit embodiment mono-provided by the invention.
In the present embodiment, described charge-discharge protection circuit comprises: charge management module 101, driver module 102 and charge and discharge protecting module 103;
The first end of described driver module 102 connects the output of described charge management module 101; The second end of described driver module 102 connects described rechargeable battery; The control end of described driver module 102 connects described charge and discharge protecting module 103;
Charging current (for being provided by charge power supply, not shown) is provided the input of described charge management module 101;
Described charge management module 101, exports for the output voltage of charge power supply is adjusted to default charging voltage, and the output current of described charge power supply is adjusted to default charging current exports;
Described charge and discharge protecting module 103, for detecting the described charging voltage of described charge management module 101 outputs and the voltage of described rechargeable battery, and according to driver module 102 conductings or disconnection described in the voltage control of the described charging voltage detecting and rechargeable battery;
Described driver module 102, has conducting state or off-state, and described driver module 102 is in conducting state, and described rechargeable battery discharges and recharges; Described driver module 102 is in off-state, and described rechargeable battery stops discharging and recharging.
Described charge power supply is charger (described charger is generally connected in civil power), and described charge management module 101 can connect the charger of various different rated output voltages.
Described charge management module 101 can connect the charger of different output voltages, and described output voltage is adjusted to default charging voltage.Thus; described charge-discharge protection circuit can be realized the direct current that the electric energy in certain voltage interval is adjusted into normal voltage; realized mating of common batteries and various model chargers; common batteries only need, in conjunction with described charge-discharge protection circuit, can adapt to most chargers widely.
In the middle of described charge-discharge protection circuit, utilize charge and discharge protecting module and driver module to realize the combination of charge protector and discharge protection circuit.
Described charge and discharge protecting module can be monitored the voltage of the output voltage of charge management module or rechargeable battery according to control strategy in charging process, to control described driver module conducting or disconnection.
By charge management module, the charging current in the certain voltage interval of various common charger outputs is adjusted into the direct current of normal voltage, thereby common batteries only need be combined with described charge-discharge protection circuit, and the charger of available different model charges; And compatible charge protection and discharge prevention function, further improved the adaptability of battery to charger in charge and discharge protecting module, the charging that makes battery is Portable safety more; And in prior art, be that charge protector is set in charger; discharge protection circuit is set in terminal equipment; terminal equipment only can be applicable to special-purpose charger like this, and in scheme provided by the invention, charge-discharge protection circuit is arranged in terminal equipment; terminal equipment has comprised charge management module; charge and discharge protecting module, therefore, terminal equipment has had the function that regulates charging voltage charging current and charge and discharge protecting; go for various chargers, versatility is provided.
Charge-discharge protection circuit embodiment bis-:
Referring to Fig. 2, this figure is the schematic diagram of charge-discharge protection circuit embodiment bis-provided by the invention.
In the present embodiment, described charge and discharge protecting module is controlled described driver module conducting or disconnection, is specially:
Described charge and discharge protecting module 103 detects described charging voltage while being greater than the voltage of described rechargeable battery, and for controlling described driver module 102 conductings, described charge management module 101 is charged for described rechargeable battery 104;
The voltage that described charge and discharge protecting module 103 detects described rechargeable battery 104 during higher than default overcharged voltage threshold value, disconnects for controlling described driver module 102, and described charge management module 101 stops charging for described rechargeable battery 104;
When the voltage that described charge and discharge protecting module 103 detects described rechargeable battery is pressed threshold value lower than default overdischarge, for controlling described driver module 102, disconnect, described rechargeable battery 104 stops electric discharge.
In the present embodiment, described driver module 102 comprises the first controllable switch S 1 and the second controllable switch S 2;
The first end of described the first controllable switch S 1 is as the first end of described driver module 102, and the second end of described the first controllable switch S 1 connects the first end of described the second controllable switch S 2;
The second end of described the second controllable switch S 2 is as the second end of described driver module 102;
The control end of the control end of described the first controllable switch S 1 and the second controllable switch S 2 is all connected described charge and discharge protecting module 103.
Be understandable that, charge and discharge protecting module 103 is controlled the on off state of S1 and S2, specifically can by output control signal, drive the control end of S1 and S2, so that S1 and S2 conducting or disconnection.
It should be noted that, due to S1 and S2 series connection, therefore, when charge management module 101 is rechargeable battery 104 charging, S1 and S2 are all closed.Be understandable that, when rechargeable battery 104 electric discharge, S1 and S2 also need equal closure.Because the flow direction of electric current is unidirectional, during charging, electric current flows into rechargeable battery 104, during electric discharge, and outflow of bus current rechargeable battery 104, therefore, rechargeable battery 104 only can be in a state at synchronization, or in charged state, or in discharge condition.
More than introduced, during charge or discharge, S1 and S2 all need closure.But do not charge, or while not discharging, because two switch S 1 and S2 are the relations of series connection, only need to disconnect one of them and just can realize electric current and do not circulate.
Introduce below and how to control S1 realization charging control, how to control S2 and realize control of discharge.
The control procedure of paper charge protection.
Described charge and discharge protecting module 103 detects described charging voltage while being greater than the voltage of described rechargeable battery 104, and for controlling the S1 conducting of described driver module, described charge management module 101 is charged for described rechargeable battery 104; It should be noted that, now S2 is conducting, and S2 is all conductings except crossing at rechargeable battery 104 state of putting.
The voltage that described charge and discharge protecting module 103 detects described rechargeable battery 104 during higher than default overcharged voltage threshold value, disconnects for controlling the S1 of described driver module, and described charge management module 101 stops charging for described rechargeable battery 104; Now, because S1 and S2 are series relationship, therefore, as long as S1 disconnects, charge management module 101 has just been disconnected with the path of rechargeable battery 104, even if now S2 closure does not affect yet and stops charging.
In addition, at this, introduce discharge path.Because rechargeable battery 104 has been full of electric weight; S1 has disconnected; now; charge and discharge protecting module 103 detects charge management module 101 does not have voltage to input; illustrate that charge management module 101 has removed, now control again S1 conducting (closure), because S1 and S2 are all closed; now rechargeable battery 104 can discharge, and discharge path leads to.
Introduce the control procedure of discharge prevention below.
When the voltage that described charge and discharge protecting module 103 detects described rechargeable battery 104 is pressed threshold value lower than default overdischarge, for controlling the S2 of described driver module, disconnect, now, discharge path is cut off, and described rechargeable battery 104 stops electric discharge.
It should be noted that, when charge and discharge protecting module 103 detects, need charging, and the voltage of charge management module 101 output is during higher than the voltage of rechargeable battery 104, will control S1 and S2 all closed.
The control logic of S1 and S2 is realized by charge and discharge protecting module 103.During charging and discharging, S1 and S2 are all closed, and while overcharging, S1 disconnects, and cross while putting, and S2 disconnects.
Therefore, the control that realizes charge protection that S1 is corresponding, S2 correspondence realizes the control of discharge prevention.
Described charge power supply is any rated voltage (being that described charge power supply is the charger with any rated voltage within the scope of 9-17V) within the scope of 9-17V, described charge power supply is connected in described charge management module 101 by filter capacitor 101, described charge management module 101, for connecting the charger of different output voltages, and described output voltage is adjusted to default charging voltage.For example; described charge management module 101 is the charge protection chip of TP5100 model; controlling resistance R1 is connected in the edited charging voltage pin of charge protection chip, by regulating the resistance of controlling resistance R1 that charge protection chip is set respectively, is that two joint rechargeable battery 8.4V or single-unit rechargeable battery 4.7V charge.Controlling resistance R2 is connected in the trickle precharge electric current pin of charge protection chip, and the resistance by regulating controlling resistance R2 generally charge protection chip is set to the trickle precharge electric current of constant current 10%.By controlling resistance R1 and controlling resistance R2, control charging current parameter.According to electronic product battery capacity, set this parameter, can set the charging rate of battery, excessive electric current easily causes battery to damage.Too small electric current causes long heating of charging interval.This circuit is increased to electronic product punching, any power supply, its charging interval, charging current are all the same, so charge power supply is can worse property very strong.
In addition, also comprise Schottky diode 105;
The output of described charge management module 101 connects the negative electrode of described Schottky diode 105, the plus earth of described Schottky diode 105.
The effect of Schottky diode 105 is to utilize the characteristic of diode reverse cut-off to prevent harm anodal and that negative pole reversal connection brings.
This charge-discharge protection circuit, also comprises the first filter inductance 106, the first filter capacitor 1011, the second filter capacitor 107, the first resistance 108 and the first current-limiting resistance 109;
The output of described charge management module 101 is connected the input of described driver module 102 by described first filter inductance 106 of series connection with the first current-limiting resistance 109;
Wherein, the first filter inductance 106 is realized the stability of charging current, and the first current-limiting resistance 109 is realized current limliting, makes the charging current can be very not large, occurs spike.
The input of described driver module 102 is by described the first filter capacitor 1011 ground connection;
The first filter capacitor 1011 is realized the effect of filtering.
The output of described charge management module 101 is by described the first resistance 108 and second filter capacitor 107 ground connection of series connection.
The first resistance 108 and the second filter capacitor 107 are realized the effect of filtering.
The charge-discharge protection circuit that the present embodiment provides, also comprises: the first sampling resistor 1013 and the second sampling resistor;
Described the first sampling resistor 1013 is set between described driver module 102 and described charge and discharge protecting module 103;
By the voltage on the first sampling resistor 1013, can know the voltage swing of charge management module 101 outputs.
Described charge and discharge protecting module 103 is by the described charging voltage of described the first sampling resistor 1013 detecting;
Described the second sampling resistor is set between described charge and discharge protecting module 103 and described rechargeable battery 104;
It should be noted that, the second sampling resistor comprises two in the present embodiment, is respectively resistance 1018 and resistance 1019.Because rechargeable battery 1014 comprises two batteries, therefore, utilize respectively 1018 and 1019 to the voltage of this two batteries, to measure respectively.
Described charge and discharge protecting module 103 is detected the voltage of described rechargeable battery by this second sampling resistor.
It should be noted that, charge and discharge protecting module 103 drives S1 by resistance 1014, by resistance 1015, drives S2; general driving signal is current signal; in order to limit the spike of drive current moment, switch is caused to damage, therefore, use resistance 1014 and 1015 to realize protection.
Described charge management module comprises one or more voltage-regulation resistance.Charge management module, for the parameter of battery, sets in advance a standard charging voltage.After the charging current in 9V~17V interval that charge management module provides at the common charger of connection, what charge management module was unified is standard charging voltage by the voltage-regulation of this voltage range charging current, then with galvanic formal output.
Utilize described regulating resistance, described charge management module can also be controlled the intensity of the direct current of output, regulates charging rate, prevent that excessive charging current from causing battery to damage, or too small charging current causes the problems such as charging interval and long hair heat.And at the beginning of charge initiation, by regulating resistance, export a less pre-charge current, follow-uply progressively electric current is increased to again to conventional intensity, avoid high electric current for the impact of battery.
In addition, in the middle of described charge management module, preferably can also set up filter capacitor, for charging current is carried out to filtering.
Be connected to the input of charge management module 101 and the filter capacitor C1 between ground is for level and smooth charge power supply, and then protection charge management module 101.
It should be noted that, S1 and S2 are gate-controlled switch, such as realizing by controlled tr tubes such as BJT, MOSFET, IGBT.
Structure based on above-mentioned charge-discharge protection circuit and control strategy make described charge-discharge protection circuit have the function of charge protection and discharge prevention simultaneously.Described charge-discharge protection circuit, in charge protection process, is controlled described driver module and is disconnected, and to block described direct current, to rechargeable battery, charges; Described charge-discharge protection circuit, in discharge prevention process, is controlled described driver module and is disconnected, to block described rechargeable battery electric discharge.
In charging process charge management module be connected charging current, and by charging current joint for reaching the direct current of default standard charging voltage.When charge and discharge protecting module detect the DC voltage of charge management module output up to standard after, control driver module conducting, the direct current of guiding charge management module output flows into battery and charges.
And at the beginning of charge initiation, can export a less pre-charge current by regulating resistance, and follow-uply progressively electric current is increased to again to conventional intensity, avoid high electric current for the impact of battery
When the voltage of rechargeable battery is higher than default overcharged voltage threshold value, illustrating that charging completes, continue charging by the generation phenomenon that overcharges; so controlling driver module disconnects; to block described direct current, to rechargeable battery, charge, charging is stopped, realizing charge protection.
After battery completes charging, and voltage-regulation and charging current disconnection, the discharge condition that enters battery.Now charge and discharge protecting module is controlled driver module conducting, so that described rechargeable battery starts electric discharge.
The normal use procedure of battery is the process of an electric discharge.In the middle of use procedure, the conducting always of described driver module, and described charge and discharge protecting module is in this course without playing a role.When discharge process continues the regular hour, the voltage of rechargeable battery is pressed threshold value lower than default overdischarge, illustrates that the electric weight of battery is very low, and continuing electric discharge will occur the phenomenon of over-discharge can.So in this case, charge and discharge protecting module starts to get involved, and controls driver module disconnection, so that described rechargeable battery stops electric discharge, realizes discharge prevention.
In the present embodiment, between described driver module and described charge management module, be provided with the first sampling resistor, described charge and discharge protecting module is detected described charging voltage by this first sampling resistor; Between described charge and discharge protecting module and described rechargeable battery, be provided with the second sampling resistor, described charge and discharge protecting module is detected the voltage of described rechargeable battery by this second sampling resistor.
Described charge-discharge protection circuit switches in charging, charge protection and three kinds of situations of discharge prevention is to realize by controlling the operating state of described driver module.
The filtering device of enumerating above for the present embodiment, can have different concrete combining forms in the art, its concrete form is not made to restriction in the present embodiment.But the present embodiment is passed the imperial examinations at the provincial level and has been exemplified a kind of structure of filter assemblies, charge-discharge protection circuit shown in Figure 2.
Also it should be noted that, for some, the electronic product that two even a plurality of batteries can move is installed simultaneously, two or more described batteries can share a charge-discharge protection circuit.Described driver module and charge and discharge protecting module can multily be connected respectively to each battery.Charge and discharge protecting module gathers respectively the voltage of each rechargeable battery, and controls connection conducting or the disconnection of driver module to respective battery.Realize the control of a plurality of battery independent parallels, to meet the demand of a plurality of batteries being charged simultaneously, the charging effect of each battery is independent of each other.
As seen through the above technical solutions, the beneficial effect that the present embodiment exists is: the direct current that the charging current in the certain voltage interval of various common charger outputs is adjusted into normal voltage, thereby common batteries only need be combined with described charge-discharge protection circuit, and the charger of available different model charges; And compatible charge protector and discharge protection circuit, further improved the adaptability of battery to charger in described charge-discharge protection circuit, the charging that makes battery is Portable safety more; By filter assemblies is set in charge-discharge protection circuit, improved stability and the fail safe of charge-discharge protection circuit; By charge-discharge protection circuit of a plurality of battery sharings, realize the independent parallel charging of a plurality of batteries, independently carry out charge protection or discharge prevention.
A kind of charge-discharge protection circuit providing based on above embodiment, the embodiment of the present invention also provides a kind of charge-discharge system, below in conjunction with accompanying drawing, describes in detail.
System embodiment one:
Referring to Fig. 3, this figure is charge-discharge system embodiment mono-schematic diagram provided by the invention.
The charge-discharge system that the present embodiment provides comprises: charge power supply 301 and terminal equipment 302;
Described terminal equipment 302 has the charge-discharge protection circuit described in rechargeable battery and above embodiment.
Wherein, described charge-discharge protection circuit is realized according to the charge-discharge protection circuit shown in previous embodiment.
Described protective circuit comprises: charge management module, driver module and charge and discharge protecting module;
The first end of described driver module connects the output of described charge management module; The second end of described driver module connects described rechargeable battery; The control end of described driver module connects described charge and discharge protecting module;
The input of described charge management module connects charge power supply;
Described charge management module, exports for the output voltage of charge power supply is adjusted to default charging voltage, and the output current of described charge power supply is adjusted to default charging current exports;
Described charge and discharge protecting module, for detecting the described charging voltage of described charge management module output and the voltage of described rechargeable battery, and according to driver module conducting or disconnection described in the voltage control of the described charging voltage detecting and rechargeable battery;
Described driver module, has conducting state or off-state, and described driver module is in conducting state, and described rechargeable battery discharges and recharges; Described driver module is in off-state, and described rechargeable battery stops discharging and recharging.
Described charge power supply 301 can be charger; described terminal equipment 302 can be corpuscular counter; in this corpuscular counter 302, have rechargeable battery and charge-discharge protection circuit, this corpuscular counter 302 charges to the rechargeable battery in this corpuscular counter 302 by this charger.
Due to this corpuscular counter inner integrated there is the charge management module of power source conversion function; and the charge and discharge protecting module with charge protection and discharge prevention function; therefore, this corpuscular counter can be applied to multiple charger, has better versatility.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (10)

1. a charge-discharge protection circuit, is characterized in that, described protective circuit comprises: charge management module, driver module and charge and discharge protecting module;
The first end of described driver module connects the output of described charge management module; The second end of described driver module connects described rechargeable battery; The control end of described driver module connects described charge and discharge protecting module;
The input of described charge management module connects charge power supply;
Described charge management module, exports for the output voltage of charge power supply is adjusted to default charging voltage, and the output current of described charge power supply is adjusted to default charging current exports;
Described charge and discharge protecting module, for detecting the described charging voltage of described charge management module output and the voltage of described rechargeable battery, and according to driver module conducting or disconnection described in the voltage control of the described charging voltage detecting and rechargeable battery;
Described driver module, has conducting state or off-state, and described driver module is in conducting state, and described rechargeable battery discharges and recharges; Described driver module is in off-state, and described rechargeable battery stops discharging and recharging.
2. charge-discharge protection circuit according to claim 1, is characterized in that, described charge and discharge protecting module is controlled described driver module conducting or disconnection, is specially:
Described charge and discharge protecting module detects described charging voltage while being greater than the voltage of described rechargeable battery, and for controlling described driver module conducting, described charge management module is that described rechargeable battery charges;
The voltage that described charge and discharge protecting module detects described rechargeable battery during higher than default overcharged voltage threshold value, disconnects for controlling described driver module, and described charge management module stops charging for described rechargeable battery;
When the voltage that described charge and discharge protecting module detects described rechargeable battery is pressed threshold value lower than default overdischarge, for controlling described driver module, disconnect, described rechargeable battery stops electric discharge.
3. charge-discharge protection circuit according to claim 2, is characterized in that, described driver module comprises the first gate-controlled switch and the second gate-controlled switch;
The first end of described the first gate-controlled switch is as the first end of described driver module, and the second end of described the first gate-controlled switch connects the first end of described the second gate-controlled switch;
The second end of described the second gate-controlled switch is as the second end of described driver module;
The control end of the control end of described the first gate-controlled switch and the second gate-controlled switch is all connected described charge and discharge protecting module.
4. charge-discharge protection circuit according to claim 1, is characterized in that, described charge power supply is charger, and described charge management module for connecting the charger of different output voltages, and is adjusted to default charging voltage by described output voltage.
5. charge-discharge protection circuit according to claim 1, is characterized in that, also comprises Schottky diode;
The output of described charge management module connects the negative electrode of described Schottky diode, the plus earth of described Schottky diode.
6. according to charge-discharge protection circuit described in claim 1-5 any one, it is characterized in that, also comprise the first filter inductance, the first filter capacitor, the second filter capacitor, the first resistance and the first current-limiting resistance;
The output of described charge management module is connected the input of described driver module by described first filter inductance of series connection with the first current-limiting resistance;
The input of described driver module is by described the first filter capacitor ground connection;
The output of described charge management module is by described the first resistance and the second filter capacitor ground connection of series connection.
7. charge-discharge protection circuit according to claim 1, is characterized in that, also comprises: the first sampling resistor and the second sampling resistor;
Described the first sampling resistor is set between described driver module and described charge management module;
Described charge and discharge protecting module is detected described charging voltage by described the first sampling resistor;
Described the second sampling resistor is set between described charge and discharge protecting module and described rechargeable battery;
Described charge and discharge protecting module is detected the voltage of described rechargeable battery by this second sampling resistor.
8. charge-discharge protection circuit according to claim 3; it is characterized in that, described charge and discharge protecting module is controlled after described driver module disconnection, described charge management module and rechargeable battery detected and disconnects; control described driver module conducting, so that described rechargeable battery starts electric discharge.
9. a charge-discharge system, is characterized in that, this system comprises: charge power supply and terminal equipment:
In this terminal equipment, have rechargeable battery and charge-discharge protection circuit, wherein, described charge-discharge protection circuit is the charge-discharge protection circuit described in claim 1~8 any one.
10. charge-discharge system according to claim 9; it is characterized in that, described charge power supply is charger, and described terminal equipment is corpuscular counter; in this corpuscular counter, have rechargeable battery and charge-discharge protection circuit, this corpuscular counter charges to this rechargeable battery by this charger.
CN201410494392.1A 2014-09-24 2014-09-24 Charging and discharging protection circuit and charging and discharging system Pending CN104218648A (en)

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