CN208046260U - A kind of charging control circuit and charging unit - Google Patents

Abstract

The utility model is charge protection technical field, is related to charging control circuit and charging unit includes：The first input end of first comparator receives the first reference voltage, second input terminal is grounded by thermistor, second input terminal of first comparator is also connected by first resistor with reference voltage source, the third input terminal of second comparator receives the second reference voltage, 4th input terminal is connected with the positive terminal of power module, the negative pole end of power module receives power supply cathode electric signal, it is connected with the first output end of first comparator with the 5th input terminal of door, it is connected with the second output terminal of the second comparator with the 6th input terminal of door, it is connected with the control terminal of switch element with the third output end of door, first path terminal of switch element receives the positive electric signal of power supply, the alternate path end of switch element is connected with the 4th input terminal of the second comparator.The charging control circuit and charging unit of the utility model can provide charging modes conveniently, safe, to activate accumulator.

Description

A kind of charging control circuit and charging unit

Technical field

The utility model belong to battery charge protection technical field more particularly to a kind of charging control circuit and charging dress It sets.

Background technology

Currently, in people's lives can use arrive various electric appliance, and to the mode of electronic power also there are many kinds of, example Such as electric appliance passes through line powering, storage battery power supply, solar powered.Wherein, using the electric appliance of storage battery power supply, for a long time It is not used, internal accumulator, which may discharge, excessively (referred to as to be crossed and put) and cause permanent damage to battery, therefore, at present Most accumulator can all have under-voltage protection function, avoid accumulator from crossing and put and damage.Storage battery under-voltage protection can cut off electricity The connection in pond and mainboard causes accumulator that can not charge, electric appliance also cannot be started up (prevent user be forced to electric appliance booting so that The case where booting high current damages accumulator or mainboard).

The case where under-voltage protection is in the accumulator of electric appliance, it usually needs the repair location for sending to profession, by tearing machine open The accumulator progress short time is flung, to release the under-voltage protection of accumulator, and then electric appliance is enable charge simultaneously normally Booting uses, but the electric appliance that accumulator be in under-voltage protection send to professional repair location and repairs, not only maintenance cost It is expensive, and need to tear machine open, therefore there is the risk for other devices for damaging electric appliance during tearing machine open, and use to electric appliance plug-in The method that source is flung, even if under-voltage protection can be released, can also greatly increase accumulator makes electric power storage because the method charges Pond temperature is excessively high and burns out accumulator or burns out the risk of the mainboard of electric appliance, causes the economic loss of bigger, therefore how to carry For a kind of convenient, economical and practical, and the activation accumulator that will not be damaged to accumulator or electric appliance is stored with releasing The charging modes of the under-voltage protection state of battery, which are for we, to be considered.

Utility model content

A kind of charging circuit of the utility model offer and device, technical problem to be solved are, provide a kind of convenience , safe charging modes, to release the under-voltage protection state of accumulator, to activate accumulator.

The utility model is realized in this way：

The utility model provides a kind of charging control circuit, is connected with power module, including the first comparison module, second Comparison module and switch module.First comparison module, including thermistor, first resistor and first comparator.Wherein, the first ratio Include first input end, the second input terminal and the first output end compared with device, first input end receives the first reference voltage, the second input End is grounded by thermistor, and the second input terminal of first comparator is also connected by first resistor with reference voltage source.The Two comparison modules, including the second comparator.Second comparator includes third input terminal, the 4th input terminal and second output terminal, and Three input terminals receive the second reference voltage, and the 4th input terminal is connected with the positive terminal of power module, wherein the cathode of power module End receives power supply cathode electric signal.Switch module, including with door and switch element.Include the 5th input terminal, the 6th input with door End and third output end, are connected with the 5th input terminal of door with the first output end of first comparator, the 6th input terminal with door It is connected with the second output terminal of the second comparator, is connected with the control terminal of switch element with the third output end of door, wherein switch First path terminal of element receives the positive electric signal of power supply, the alternate path end of switch element and the 4th input of the second comparator End is connected.

Further, the first comparison module further includes second resistance and 3rd resistor.The first input end of first comparator It is grounded by second resistance, and the first input end of first comparator is also connected by 3rd resistor with reference voltage source, to So that the first input end of first comparator receives the first reference voltage.

Further, switch module further includes the 4th resistance, and the alternate path end of switch element by the 4th resistance with 4th input terminal of the second comparator is connected.

Further, reference voltage source provides power supply positive electric signal.

Further, the third input terminal of the first input end of first comparator and the second comparator is positive input Mouthful.

Further, switching molding switch element in the block is NMOS tube.

Further, power module is lithium battery source module.Ranging from 3.5V~3.9V of second reference voltage.

The utility model additionally provides a kind of charging unit, and device includes above-described charging control circuit.

Charging control circuit and charging unit provided by the utility model, are connected with power module, including first compares mould Block, the second comparison module and switch module.First comparison module, including thermistor, first resistor and first comparator.Its In, first comparator includes first input end, the second input terminal and the first output end, and first input end receives first with reference to electricity Pressure, the second input terminal are grounded by thermistor, and the second input terminal of first comparator also passes through first resistor and reference electricity Potential source is connected.Second comparison module, including the second comparator.Second comparator includes third input terminal, the 4th input terminal and Two output ends, third input terminal receive the second reference voltage, and the 4th input terminal is connected with the positive terminal of power module, wherein electricity The negative pole end of source module receives power supply cathode electric signal.Switch module, including with door and switch element.Include the 5th input with door End, the 6th input terminal and third output end, are connected with the 5th input terminal of door with the first output end of first comparator, with door 6th input terminal is connected with the second output terminal of the second comparator, with the third output end of door and the control terminal phase of switch element Even, wherein the first path terminal of switch element receives the positive electric signal of power supply, and the alternate path end of switch element is compared with second 4th input terminal of device is connected.To be in under-voltage protection in using charging control circuit provided by the utility model to electric appliance Accumulator under state carry out plug in activate the accumulator during, can be detected in real time by the second comparison module The voltage of the accumulator, and the temperature and tune of the accumulator can be monitored by the heat-sensitive sensor in the first comparison module in real time Whole resistance value, and can allow the accumulator during charging by switch module while meet and not reach the nominal of accumulator Voltage, and temperature could give the accumulator to charge in allowed limits, be effectively prevented in under-voltage protection state Accumulator charging when, accumulator hair heat-induced damage accumulator or electric appliance mainboard the case where occur, therefore, this practicality newly Charging modes that type provides a convenient, safe, to release the under-voltage protection state of accumulator, to activate accumulator.

Description of the drawings

Fig. 1 is the structural schematic diagram for the charging control circuit that the utility model embodiment one provides；

Fig. 2 is the structural schematic diagram for the charging control circuit that the utility model embodiment two provides.

Specific implementation mode

In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation Example, the present invention will be further described in detail.It should be appreciated that described embodiment is only the utility model one Divide embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not having The every other embodiment obtained under the premise of creative work is made, shall fall within the protection scope of the present invention.

Although the utility model describes different elements, signal, port etc. using the first, second, third, etc. term, It is that these elements, signal, port etc. are not limited by these terms.These terms are intended merely to element, signal, an end Mouth is distinguished with another element, signal, port.In the present invention, an element, port and another element, end Mouth " connected ", " connection ", it can be understood as be directly electrically connected, or it can be appreciated that there are the indirect electrical of intermediary element Connection.Unless otherwise defined, all terms (including technical terms and scientific terms) used in the utility model have With the normally understood meaning of the utility model those of ordinary skill in the art institute.

The utility model embodiment is further described below in conjunction with the accompanying drawings.

Embodiment one：

Fig. 1 is the structural schematic diagram for the charging control circuit that the utility model embodiment one provides.In order to be explicitly described Charging control circuit provided in this embodiment, refers to Fig. 1.

Referring to Fig. 1, the charging control circuit that the utility model embodiment one provides compares including the first comparison module 1, second Compared with module 2 and switch module 3, charging control circuit is connected with power module 4.

In one embodiment, the power module 4 in the present embodiment is the power module inside electric appliance (i.e. not by power supply mould Block 4 takes apart from electric appliance), and the power module 4 is in under-voltage protection state.

In one embodiment, the positive terminal of power module 4 is connected with the second comparison module 2, the negative pole end of power module 4 It can be connected with additional voltage source, to make the negative pole end of power module 4 receive the power supply cathode telecommunications of voltage source offer Number V-.

Wherein, the first comparison module 1 includes thermistor RT, first resistor R1 and first comparator 101.

Specifically, referring to Fig. 1, first comparator 101 includes first input end VI1, the second input terminal VI2 and the first output Hold VO1.The first input end VI1 of first comparator 101 receives the first reference voltage VCC1, and the second of first comparator 101 is defeated Enter to hold VI2 to be grounded by thermistor RT, and the second input terminal VI2 of first comparator 101 also by first resistor R1 with Reference voltage source is connected, to receive the reference voltage VCC of reference voltage source offer.

In one embodiment, usual accumulator (power module) can be generated heat when in use or when charging, but for storing Battery-heating has the range of the calorific value of permission, and the calorific value of accumulator is related with the voltage value for flowing through accumulator, therefore The range for the calorific value that accumulator allows can allow the range of voltage values of fever corresponding with accumulator.Therefore the first reference voltage The voltage value of VCC1 is determined according to range of voltage values of the power module 4 in charging corresponding to the calorific value range that allows, is led to Often take the upper limit value of the range of voltage values.

In one embodiment, reference voltage source is for providing reference voltage VCC.Second input of first comparator 101 End VI2 is grounded by thermistor RT, and is also connected to receive reference voltage with reference voltage source by first resistor R1 VCC, i.e. first resistor R1 connect with thermistor RT, are divided to reference voltage VCC, by select a certain resistance value the In the thermistor RT of a certain resistance value under one resistance R1 and normality, reference voltage VCC is divided to obtain certain voltage value Another reference voltage be input to the second input terminal VI2 of first comparator 101, ensure when not charging to power module 4, the The voltage value that second input terminal VI2 of one comparator 101 is provided has to be less than the first reference voltage VCC1.

Wherein, temperature rise when the thermistor RT in the present embodiment can charge according to power module 4 and increase Resistance value, to making the voltage value that the second input terminal VI2 of first comparator 101 is received with the raising of 4 temperature of power module Increase.In other embodiments, thermistor RT can be the thermistor RT in heat sensor, and heat sensor can be used for examining Survey the temperature of accumulator.

In one embodiment, first comparator 101 is voltage comparator, and voltage comparator is reflected to input signal Circuit not compared with is the basic element circuit for forming non-sine wave generation circuit.In practical applications, voltage comparator is also Including feeder ear and ground terminal (not shown), and the feeder ear of voltage comparator and power supply (such as reference voltage source) It is connected, the ground terminal ground connection of voltage comparator.Voltage comparator can be regarded as amplification factor and be put close to the operation of " infinity " Big device.The function of voltage comparator：The size for comparing two voltage (uses the high or low level of output voltage, indicates two inputs The magnitude relationship of voltage)：

When the voltage of positive input (+) is higher than reverse input end (-), voltage comparator output is high level；When just When being less than reverse input end (-) to the voltage of input terminal (+), voltage comparator output is low level.Due to the output of comparator Only low level and high level two states, so integrated transporting discharging therein is often operated in inelastic region.

Referring to Fig. 1, in one embodiment, the first input end VI1 of first comparator 101 is positive input mouth, the VI2 mouthfuls of the second input terminal of one comparator 101 is reverse input end mouth.Therefore when the power module 4 in low-voltage variation state When the charging circuit that just access the utility model embodiment one provides, the first input end VI1 of first comparator 101 receive the The voltage value of one reference voltage VCC1 is more than the voltage value of the second input terminal VI2 of first comparator 101, so when first compare After first output end VO1 of device 101 exports high level, but temperature during charging of the power module 4 increases, first The voltage value of second input terminal VI2 of comparator 101 can also increase, when the voltage of the second input terminal VI2 of first comparator 101 When value is more than the voltage value of the first reference voltage VCC1 of the first input end VI1 receptions of first comparator 101, first comparator 101 the first output end VO1 exports low level.

Wherein, the second comparison module 2 includes the second comparator 201.

Specifically, referring to Fig. 1, the second comparator 201 includes third input terminal VI3, the 4th input terminal VI4 and the second output Hold VO2.The third input terminal VI3 of second comparator 201 receives the second reference voltage VCC2, and the 4th of the second comparator 201 is defeated Enter to hold VI4 and the positive terminal of power module 4 to be connected.The negative pole end of power module 4 therein receives power supply cathode electric signal V-.

In one embodiment, the second reference voltage VCC2 can be the nominal voltage of power module 4, can also be nominal It is on the basis of voltage that margin voltage is set more.For example, the nominal voltage that power module 4 is lithium battery is 3.7V, then the second reference Between the setting of voltage VCC2 values may range from 3.5V~3.9V, for example, 3.6V.

In one embodiment, the second comparator 201 is voltage comparator.The third input terminal VI3 of second comparator 201 The 4th input terminal VI4 for positive input, the second comparator 201 is reverse input end.It charges initially when to power module 4 When, the voltage value of the power module 4 in low-voltage variation state must be that the nominal voltage of power module is not achieved, therefore meeting Less than the voltage value of the second reference voltage VCC2, i.e. the voltage value of the 4th input terminal VI4 of the second comparator 201 can be less than second The voltage value for the second reference voltage VCC2 that the third input terminal VI3 of comparator 201 is received, at this time the second comparator 201 output High level, but in subsequent charging process, 4 voltage value of power module can increase, therefore the 4th input of the second comparator 201 The voltage value of end VI4 can also increase, and when the voltage value of the 4th input terminal VI4 of the second comparator 201 is more than the second comparator When the voltage value for the second reference voltage VCC2 that 201 third port connects, the second comparator 201 exports low level.

Wherein, switch module 3 includes and door 301 and switch element Q1.

Specifically, include the 5th input terminal VI5, the 6th input terminal VI6 and third output end VO3 with door 301 referring to Fig. 1. It is connected with the 5th input terminal VI5 of door 301 with the first output end VO1 of first comparator 101, the 6th input terminal with door 301 VI6 is connected with the second output terminal VO2 of the second comparator 201, the control with the third output end VO3 and switch element Q1 of door 301 End processed is connected.Wherein, the first path terminal of switch element Q1 receives the positive electric signal V+ of power supply, the alternate path of switch element Q1 End is connected with the 4th input terminal VI4 of the second comparator 201.

Wherein, with 301 (English of door：AND gate) it is also known as " with circuit ", logic " product ", logical "and" circuit.It is to execute The basic logic gate circuit of AND operation.There are multiple input end, an output end.When all inputs (are patrolled for high level simultaneously When collecting 1), output is just high level, and otherwise output is low level (logical zero), is expressed with the mathematical logic of door 301 secondly inputting Formula：Y=AB.

In one embodiment, power supply anode electric signal V+ and power supply cathode electric signal V- is that applied voltage source provides 's.In other embodiments, reference voltage source provides power supply anode electric signal V+ and power supply cathode electric signal V-.

In one embodiment, switch element Q1 is metal-oxide-semiconductor.MOS transistor is divided into p-type metal-oxide-semiconductor and N-type metal-oxide-semiconductor.By The integrated circuit that metal-oxide-semiconductor is constituted is known as MOS integrated circuits, is exactly NMOS integrated circuits by the circuit that NMOS is formed, by PMOS tube The circuit of composition is exactly PMOS integrated circuits, by NMOS and PMOS two kinds of pipes molecular complementation MOS circuits, i.e. cmos circuit. In the present embodiment, switch element Q1 is NMOS tube, and NMOS full name in English is N-Metal-Oxide-Semiconductor. The meaning is N-type Metal-oxide-semicondutor, and possesses the transistor of this structure we term it NMOS transistor, i.e., high electricity The switch element of flat conducting.

Referring to Fig. 1, in one embodiment, VI1 mouthfuls of the first input end of first comparator 101 is positive input mouth, VI2 mouthfuls of the second input terminal of first comparator 101 is reverse input end mouth, and the third input terminal VI3 of the second comparator 201 is 4th input terminal VI4 of positive input, the second comparator 201 is reverse input end.

Specifically, when the power module 4 under low-voltage variation state has just accessed charge control provided by the utility model When circuit, the voltage value of the first reference voltage VCC1 of the first input end VI1 receptions of first comparator 101 compares more than first The voltage value of second input terminal VI2 of device 101, therefore the first output end VO1 of first comparator 101 exports high level, with this Meanwhile second the voltage value of the second reference voltage VCC2 that receives of third input terminal VI3 of comparator 201 be more than the second comparator The voltage value of 201 the 4th input terminal VI4, therefore, the second output terminal VO2 of the second comparator 201 export high level, thus with door 301 the 5th input terminal VI5 and the 6th input terminal VI6 is high level, so defeated with the third output end VO3 of door 301 at this time Go out high level, therefore the control terminal of switch element Q1 receives high level and is connected, to charge for the power module 4.

But during power module 4 charges, power module 4 can generate heat, and cause thermistor RT because of 4 temperature of power module Degree increases and resistance value increases, and the voltage value of the second input terminal VI2 of first comparator 101 can be made to be more than first comparator The voltage value for the first reference voltage VCC1 that 101 first input end VI1 is received, therefore the first output of first comparator 101 Hold VO1 export low level, due to one end input low level in the 5th input terminal VI5 of door 301 and the 6th input terminal VI6 or Both ends all input low level when, low level is exported with the third output end VO3 of door 301, so the control terminal of switch element Q1 It receives low level and is not turned on, suspend charge to the power module 4 at this time.

When the temperature of above-mentioned power module 4 reduces, resistance value subtracts thermistor RT due to the reduction of 4 temperature of power module It is small, it can make the voltage value of the second input terminal VI2 of first comparator 101 that can be less than the first input of first comparator 101 again The voltage value of the first reference signal of VI1 receptions is held, therefore the first output end VO1 of first comparator 101 exports high level, if At this point, the second comparator 201 still exports high level, then high level, switch element Q1 are exported with the third output end VO3 of door 301 Control terminal receive high level conducting and continue as power module 4 charging.

And when the first output end VO1 output high level of first comparator 101, but the power module 4 is because of charged voltage It increases so that the voltage value of the 4th input terminal VI4 of the second comparator 201 is more than the third input terminal VI3 of the second comparator 201 When the voltage value of the second reference voltage VCC2 received, the second output terminal VO2 of the second comparator 201 exports low level, therefore, The third output end VO3 output low levels with door 301 at this time, the control terminal of switch receives low level and is not turned on, so not The power module 4 is given to charge again.

And voltage value (the i.e. voltage of the positive terminal of the power module 4 of the 4th input terminal VI4 when the second comparator 201 Value) when being more than the voltage value of the second reference voltage VCC2, which has just been activated (release low-voltage variation state), It charges so as to change common charging charger or charging modes into.

The charging control circuit that the utility model embodiment provides, is connected with power module 4, including the first comparison module 1, Second comparison module 2 and switch module 3, wherein the first comparison module 1 includes thermistor RT, first resistor R1 and the first ratio Compared with device 101, the second comparison module 2 includes the second comparator 201, and switch module 3 includes and door 301 and switch element Q1.To Power module 4 in using charging control circuit provided by the utility model to electric appliance under under-voltage protection state is not right Electric appliance carries out during carrying out plug-in activation in the case of tearing machine open, can be detected in real time by the second comparison module 2 The voltage of the power module 4, by the first comparison module 1 can in thermistor can monitor the power module 4 in real time Temperature, and the power module 4 while satisfaction can be allowed not to reach the second reference voltage VCC2 by switch module 3, for example, mark Claim voltage, and the temperature of power module 4 in allowed limits could give the power module 4 charge, be effectively prevented to When power module 4 in under-voltage protection state charges, power module 4 generates heat and damages the mainboard of power module 4 or electric appliance The case where occur, therefore, there is no need to by the electric appliance that accumulator is under overvoltage protection state send to profession repair location carry out Machine is torn open to activate accumulator, so as to avoid the risk of other accessories of the electric appliance is destroyed during machine of tearing open, not only facilitates and also save Maintenance cost, therefore, charging modes that the utility model provides a convenient, safe, to release the under-voltage protection shape of accumulator State, to activate accumulator.

Embodiment two：

Fig. 2 is the structural schematic diagram for the charging control circuit that the utility model embodiment two provides.In order to clearly describe It is provided in this embodiment, it please also refer to Fig. 1 and Fig. 2.

Referring to the charging control circuit that Fig. 2, the utility model embodiment one are provided, it is connected with power module 4, including first Comparison module 1, the second comparison module 2 and switch module 3.

Referring to Fig. 2, wherein the first comparison module 1 includes thermistor RT, first resistor R1, second resistance R2, third electricity Hinder R3 and first comparator 101.Second comparison module 2 includes the second comparator 201.Switch module 3 include and door 301, switch Element Q1 and the 4th resistance R4.

Referring to Fig. 1 and Fig. 2, the utility model embodiment two and the utility model embodiment one differ only in first Comparison module 1 further comprises second resistance R2 and 3rd resistor R3, and switch module 3 further comprises the 4th resistance R4.

Referring to Fig. 2, the first input end VI1 of first comparator 101 is grounded by the second resistance R2, and the first ratio First end compared with device 101 is also connected by 3rd resistor R3 with reference voltage source, to receive reference voltage VCC, so that the The first input end VI1 of one comparator 101 receives the first reference voltage VCC1.

Specifically, the first input end VI1 of first comparator 101 is grounded by the second resistance R2, and the first ratio First end compared with device 101 is also connected by 3rd resistor R3 with reference voltage source, to receive reference voltage VCC, i.e. second resistance R2 connects with 3rd resistor R3, and the reference voltage VCC provided reference voltage source is divided, and can be a certain by selecting The second resistance R2 of the resistance and 3rd resistor R3 of a certain resistance value, to control the first input end VI1 of first comparator 101 Fixed voltage value so that the first input end VI1 of first comparator 101 receives the first reference voltage VCC1.Power supply mould is not being given When block 4 charges, the voltage value of the first input end VI1 of first comparator 101 is had to second defeated more than first comparator 101 Enter to hold the voltage value of VI2, so that the first output end VO1 of first comparator 101 is exported when power module 4 starts to charge up High level.

Referring to Fig. 2, switch module 3 further includes the 4th resistance R4, and the alternate path of the switch element Q1 in switch module 3 End is connected by the 4th resistance R4 with the 4th input terminal VI4 of the second comparator 201.

Specifically, it since the second input terminal VI2 of the second comparator 201 is also connected with the positive terminal of power module 4, that is, opens The alternate path end for closing module 3 is connected by the 4th resistance R4 with the positive terminal of power module 4, to be filled to power module 4 The case where when electric, preventing the electric current of input power module 4 excessive, damaging battery module, occurs, therefore, the 4th resistance in charging R4 plays the role of protection power source module 4.

The charging control circuit that the utility model embodiment provides, is connected with power module 4, including the first comparison module 1, Second comparison module 2 and switch module 3, wherein the first comparison module 1 includes thermistor RT, first resistor R1, second resistance R2,3rd resistor R3 and first comparator 101, the second comparison module 2 include the second comparator 201, and switch module 3 includes and door 301, switch element Q1 and the 4th resistance R4.To be in using charging control circuit provided by the utility model to electric appliance During power module 4 under under-voltage protection state carries out plug-in activation in the case where not carrying out tearing machine open to electric appliance, The voltage that can detect the power module 4 in real time by the second comparison module 2, by the first comparison module 1 can in heat Dependent sensor can monitor the temperature of the power module 4 in real time, and can allow the power module 4 while full by switch module 3 Foot does not reach nominal voltage, and the temperature of power module 4 could give the power module 4 to charge in allowed limits, effectively Ground prevent in under-voltage protection state power module 4 charge when, power module 4 generate heat and damage power module 4 or The case where mainboard of electric appliance, occurs, and the second resistance R2 in charging control circuit provided in this embodiment and 3rd resistor R3 As soon as setting enable to that first resistor R1 can only be allowed with a reference voltage source to receive reference voltage VCC, and give first The first input end VI1 of comparator provides the first reference voltage VCC1, so as to reduce the usage quantity of reference voltage source, this Outside, when the 4th resistance R4 in switch module 3 can also prevent from charging to power module 4, electric current is excessive and is caused to power module 4 The case where damage, occurs, and plays a protective role, therefore, charging modes that the utility model provides a convenient, safe, to release The under-voltage protection state of accumulator, to activate accumulator.

The utility model also provides a kind of charging unit, and the composition of the charging unit includes above-described embodiment one or implements The charging control circuit that example two is provided, therefore its specific implementation mode and advantageous effect reference implementation example one or embodiment two, It will not be described in great detail herein.

Charging unit provided by the utility model because of the charging control circuit with above-described embodiment one or embodiment two, because This can provide convenient, safe charging modes, to activate accumulator, that is, release the under-voltage protection state of accumulator.

The above is only the preferred embodiments of the present utility model only, is not intended to limit the utility model, all in this practicality Any modification, equivalent replacement or improvement etc., should be included in the guarantor of the utility model made by within novel spirit and principle Within the scope of shield.

Claims (8)

1. a kind of charging control circuit, which is characterized in that be connected with power module, including the first comparison module, second compare mould Block and switch module；

First comparison module, including thermistor, first resistor and first comparator；

Wherein, the first comparator includes first input end, the second input terminal and the first output end, and the first input end connects The first reference voltage is received, second input terminal is grounded by the thermistor, and the second input of the first comparator End is also connected by the first resistor with reference voltage source；

Second comparison module, including the second comparator；

Second comparator includes third input terminal, the 4th input terminal and second output terminal, and the third input terminal receives the Two reference voltages, the 4th input terminal are connected with the positive terminal of the power module, wherein the negative pole end of the power module Receive power supply cathode electric signal；

The switch module, including with door and switch element；

Include the 5th input terminal, the 6th input terminal and third output end, the 5th input terminal and described first with door with door First output end of comparator is connected, described to be connected with the second output terminal of second comparator with the 6th input terminal of door, It is described to be connected with the control terminal of the switch element with the third output end of door, wherein the first path terminal of the switch element The positive electric signal of power supply is received, the alternate path end of the switch element is connected with the 4th input terminal of second comparator.

2. charging control circuit as described in claim 1, which is characterized in that first comparison module further includes second resistance And 3rd resistor；

The first input end of the first comparator is grounded by the second resistance, and the first input of the first comparator End is also connected by the 3rd resistor with the reference voltage source, so that the first input end of the first comparator connects Receive first reference voltage.

3. charging control circuit as described in claim 1, which is characterized in that the switch module further includes the 4th resistance, and The alternate path end of the switch element is connected by the 4th resistance with the 4th input terminal of second comparator.

4. charging control circuit as described in claim 1, which is characterized in that the reference voltage source provides the power supply anode Electric signal.

5. charging control circuit as described in claim 1, which is characterized in that the first input end of the first comparator and institute The third input terminal for stating the second comparator is positive input mouth.

6. charging control circuit as claimed in claim 5, which is characterized in that the switching molding switch element in the block is NMOS Pipe.

7. charging control circuit as described in claim 1, which is characterized in that the power module is lithium battery source module；

Ranging from 3.5V~3.9V of second reference voltage.

8. a kind of charging unit, which is characterized in that described device includes such as claim 1-7 any one of them charge control electricity Road.