CN104333086B - A kind of charge management circuit and charger - Google Patents
A kind of charge management circuit and charger Download PDFInfo
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- CN104333086B CN104333086B CN201410649154.3A CN201410649154A CN104333086B CN 104333086 B CN104333086 B CN 104333086B CN 201410649154 A CN201410649154 A CN 201410649154A CN 104333086 B CN104333086 B CN 104333086B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
- H02J7/0049—Detection of fully charged condition
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention relates to a kind of charge management circuit and charger.The charge management circuit includes the charging control circuit and status determination circuit being sequentially connected, also include the drive circuit for being used to drive external indicating device, the drive circuit includes switching switch element and a driving switch, the switching control end of the switching switch element is connected with the status determination circuit and receives the status signal of the status determination circuit, the switching switch element has at least three inputs for being used to access different state representation signals, the output end of the switching switch element is connected to the operating side of the driving switch, the drive end of the driving switch connects the external indicating device.The charger includes a light emitting diode, and the drive end of the driving switch connects and drives the light emitting diode.The present invention is used only a light emitting diode to be indicated charger states, realizes that system cost is lower, and system is more easy to the purpose of miniaturization.
Description
Technical field
The present invention relates to a kind of charge management circuit and charger.
Background technology
Traditional charger shows charged state using two lamp modes.As shown in figure 1, charge management circuit U1 passes through VBAT
Hold to battery BAT and charge, LED 1, LED2 are driven by L1, L2 end respectively, and then realize to current charging shape
The display of state.In the inside of the charge management circuit U1, the nmos switch of usual two open-drain connected modes, to connect respectively
The LED 1 and LED2 (not indicated in figure), and each light emitting diode is driven in the way of drop-down, filled described
The outside of fulgurite reason circuit U 1 sets LED 1 and LED2 electric current by resistance R1 and R2 respectively, so as to set
The brightness of two light emitting diodes.
In charger whole work process, it is possible to use above-mentioned two light emitting diode can distinguish three kinds of states, point
It is not：
(1) when charger is not accessed, or during VBAT terminal shortcircuits, the inside nmos switch being connected with L1 ends is breaking shape
State, the inside nmos switch being connected with L2 ends is also off state, and two LEDs 1 and LED2 are all in extinguishing shape
State.
(2) when charger is accessed, and battery BAT be in charged state when, wherein first light emitting diode is lit
Luminous (such as LED1 is the light emitting diode glowed, now, and the inside nmos switch being connected with L1 ends is conducting state,
LED1 is luminance), second light emitting diode be OFF state (be, for example, LED2 be green light light emitting diode, with
The inside nmos switch of L2 ends connection is still off state, and LED2 is still OFF state).
(3) when charger is accessed, and battery is in when having been filled with state, wherein first light emitting diode extinguishes (example
Such as it is that LED1 is the light emitting diode glowed, now, the inside nmos switch being connected with L1 ends is off state, and LED1 is to put out
Go out state), second light emitting diode be lit (be, for example, the light emitting diode that LED2 is green light, be connected with L2 ends in
Portion's nmos switch is conducting state, and LED2 is luminance).
It can be seen from foregoing description, if indicating different charged states, gesture using two or more light emitting diodes
The nmos switch of necessity configuration respective amount, this undoubtedly brings higher cost, and each light emitting diode be required for account for
With specific volume or area so that the bulk shape design of charger is difficult to compress.
The content of the invention
Instant invention overcomes disadvantages mentioned above there is provided a kind of charge management circuit and charger, a hair can be used only
Optical diode is the instruction that charged state can be achieved.
The technical scheme adopted by the invention to solve the technical problem is that：A kind of charge management circuit, including be sequentially connected
Be used for control the charging control circuit and status determination circuit for judging present charge state that produce charging current, also wrap
The drive circuit for driving external indicating device is included, the drive circuit includes switching switch element and a driving switch,
The switching control end of the switching switch element is connected with the status determination circuit, the input of the switching switch element
For accessing at least three kinds different state representation signals, the output end of the switching switch element is connected to the driving switch
Operating side, the drive end of the driving switch connects the external indicating device, and the switching switch element is according to from described
The status signal that status determination circuit is received, corresponding state representation signal is switched to the output of the switching switch element
End, and then the drive end of the driving switch is exported corresponding drive signal.
The switching switch element may include corresponding with the input quantity to switch switch, the status determination circuit
With state end corresponding with the switch unit input quantity, the input of the switching switch element is opened as each switching
The input of pass, is connected respectively at each state end correspondence of the status determination circuit, and each switching switch is according to from described
The status signal that status determination circuit is received, the one of switching switch of corresponding connection, corresponding state representation is believed
Number it is switched to the output end of the switching switch element.
The state representation signal can be high level signal, low level signal, the square-wave signal of one or more frequencies, one
At least three kinds in the triangular signal of kind or multi-frequency.
In the low level signal as state representation signal, driving switch is connected to through the switching switch element
Operating side when, driving switch cut-off；
In the high level signal as state representation signal, driving switch is connected to through the switching switch element
Operating side when, driving switch conducting；
In the square-wave signal as state representation signal, driving switch is connected to through the switching switch element
During operating side, the driving switch is switched with corresponding frequency between conducting and cut-off；
In the triangular signal as state representation signal, driving switch is connected to through the switching switch element
Operating side when, the driving switch provides the alternating variable-current that becomes larger and taper into corresponding frequency.
The oscillator for exporting the state representation signal, the oscillator output are may also include in the drive circuit
Include the square-wave signal of one or more frequencies, or/and one or more frequencies triangular signal.
Driving switch in the drive circuit can be nmos switch, and the grid of the nmos switch is opened as the driving
The operating side of pass, the drain electrode of the nmos switch is used as the drive end of the driving switch, the source electrode process of the nmos switch
One feedback resistance ground connection, one of output end of the oscillator is connected to an input of an operational amplifier,
Another input of the operational amplifier is connected between the source electrode of the nmos switch and the feedback resistance, the computing
The output end of amplifier is connected with the input of the switching switch element.
The charging end and sampled signal end of the charging control circuit can respectively with the status determination circuit charging end
It is connected with sampled signal end；
The status determination circuit may include that first state judging unit, the second condition adjudgement unit and the third state judge
Unit, the first state judging unit include first voltage comparator, current comparator and with door, the voltage comparator
Positive-negative input end connect respectively charging end and with the first reference voltage end, the positive-negative input end of the current comparator connects respectively
Reference current end and the sampled signal end, the output end of the first voltage comparator and current comparator respectively with it is described with
Two inputs of door are connected, and the output end with door is the output end of first state judging unit；Second condition adjudgement
Unit includes second voltage comparator, the positive-negative input end of the second voltage comparator connect respectively the second reference voltage end and
The charging end, the output end of the second voltage comparator is the output end of the second condition adjudgement unit；Described 3rd
Condition adjudgement unit includes nor gate, two inputs of the nor gate connect respectively the first state judging unit and
The output end of second condition adjudgement unit, the output end of the nor gate is the output end of the third state judging unit.
The condition adjudgement unit may include the 4th condition adjudgement unit, and the 4th condition adjudgement unit includes the 3rd electricity
Comparator and a timer are pressed, the positive-negative input end of the tertiary voltage comparator connects power input and the 3rd ginseng respectively
Voltage end is examined, output end connects the clock end of the timer, and the output end of the first state judging unit connects the meter
When device reset terminal, the output end of the timer is the output end of the 4th condition adjudgement unit.
The condition adjudgement unit may include the 5th condition adjudgement unit, including tertiary voltage comparator and one it is anti-phase
Device, the positive-negative input end of the tertiary voltage comparator connects power input and the 3rd reference voltage end respectively, and output end connects
The input of the phase inverter is connect, the output end of the phase inverter is the output end of the 5th condition adjudgement unit.
A kind of charger with charge management circuit described in any of the above-described, including a light emitting diode, the drive
The drive end of dynamic switch connects and drives the light emitting diode.
The light emitting diode can also be connected with a pull-up resistor.
In the present invention, the working condition for the charger that the drive circuit is obtained according to the situation decision circuitry, and profit
State representation signal is accessed into driving switch with switching switch element, the driving switch is operated in different working condition, enters
And drive external indicating device to realize different illumination modes, it is achieved that coming using only an external indicating device to charging
Device state is indicated, and realizes that system cost is lower, and system is more easy to the purpose of miniaturization.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of charger in the prior art；
Fig. 2 for the present invention in charge management circuit circuit theory diagrams；
Fig. 3 is the circuit theory diagrams of status determination circuit in Fig. 2；
Fig. 4 is the circuit theory diagrams of drive circuit in Fig. 2；
Fig. 5 is the circuit theory diagrams with the charger of charge management circuit in Fig. 2.
Embodiment
The solution of the present invention and principle are illustrated with reference to Figure of description and specific embodiment, to help understanding
Present disclosure.
As shown in Figure 2, be charge management circuit in the present invention a kind of preferred embodiment circuit theory diagrams, including its
Include the charging control circuit U21, status determination circuit U22 and drive circuit U23 being sequentially connected.The charging control circuit
U21 is produced and is flowed to charging end VBAT from power input VCHG, for the electric current charged to battery, i.e., described charging end
The battery that VBAT connections are electrically charged, the charging end VBAT can be produced including precharge, constant-current charge, three kinds of moulds of constant-voltage charge
Formula, while exporting the sampled signal of charging current, output to status determination circuit in sampled signal end Isen.The charge control
Circuit U 21 can be using prior art realization, herein not reinflated description.The charging end VBAT of the status determination circuit U22 and
Sampled signal end Isen connections corresponding with the charging end VBAT and sampled signal end Isen of the charging control circuit U21 respectively.
The status determination circuit U22 has five state ends, respectively A ends, B ends, C-terminal, D ends and E ends, and respectively at the driving
Five state ends A ends, B ends, C-terminal, D the ends connection corresponding with E ends of circuit U 23, the output end L3 of the driving drive circuit U23
End, for connecting and driving external light emitting diode.
As shown in Figure 3, it is the circuit theory diagrams of status determination circuit U22 described in Fig. 2, the status determination circuit root
Judge charger according to the charging current of power input VCHG voltage, charging end VBAT voltage and sampled signal end Isen
Working condition.The status determination circuit includes：
(1) first state judging unit, including voltage comparator Comp1, current comparator Comp2 voltage comparators and with
Door AND1, Comp1 positive-negative input end connects charging end VBAT and reference voltage end VR1 (i.e. the first reference voltage end) respectively,
It is compared and exports comparative result, when charging end VBAT voltages are higher than reference voltage end VR1 voltage (such as reference voltage ends
VR1 voltage is 4.1V) when, the voltage comparator Comp1 is output as high level.Current comparator Comp2 positive negative input
End connects reference current end IR1 and sampled signal end Isen respectively, when the electric current that charging current is sampled signal end Isen is less than
During reference current end IR1 electric current, the current comparator Comp2 outputs are also high level, two inputs point with door AND1
The voltage comparator Comp1 and current comparator Comp2 output end are not connected, in the voltage comparator Comp1 and electricity
When stream comparator Comp2 output end exports high level, described is state end A ends (i.e. first state with door AND1 output ends
The output end of judging unit) it is high level, represent battery full state.
(2) second condition adjudgement units, voltage comparator Comp3 positive-negative input end connects reference voltage end VR2 respectively
With charging end VBAT, when charging end VBAT voltage less than reference voltage end VR2 voltage (i.e. the second reference voltage end, for example
Reference voltage end VR2 voltage is 2V) when, the voltage comparator Comp3 output ends are state end B ends (i.e. the second state
The output end of judging unit), and be high level, represent short-circuit condition.
(3) third state judging unit, nor gate NOR1 two inputs connect state end side a and b, shape respectively
State end A ends are low level and when state end B ends are low level, and the output end of the nor gate NOR1 is state end C-terminal the (the i.e. the 3rd
The output end of condition adjudgement unit) high level is output as, represent to be in normal charging condition.
(4) the 4th condition adjudgement units, voltage comparator Comp4 positive-negative input end connects power input VCHG respectively
With reference voltage end VE, when power input VCHG voltage be less than reference voltage end VE voltage (such as reference voltage end VE
Voltage be 3.5V) when, the comparator Comp4 is output as low level, when power input VCHG voltage be more than reference
During voltage end VE voltage, the output end connection timer TIM of voltage comparator Comp4 clock end EN ends, when described
Voltage comparator Comp4 output end signal is high level, and timer TIM starts timing, if preset time is not counted completely (for example
Default timing time is 10 hours) before, the reset terminal RST ends of the timer TIM, the i.e. signal at state end A ends is changed into high electricity
Flat, then timer TIM output ends, i.e. state end D ends (i.e. the output end of the 4th condition adjudgement unit) are reset to low level；Such as
Fruit timer reset end RST ends are low level, i.e., when not being reset, and the preset time meter of the timer TIM is expired, and output end is
State end D ends are changed into high level, and expression battery is bad battery, and time-out can not also be full of.
(5) the 5th condition adjudgement units, phase inverter INV1 input connects the output end of the comparator Comp4, instead
Phase device INV1 output end is state end E ends (i.e. the output end of the 5th condition adjudgement unit), the comparator Comp4 outputs
Low level when high level, i.e. E ends are output as after phase inverter INV1 for high level, represent that charger input voltage is abnormal
Or it is not inserted into charger.
It can be seen from foregoing description, the status determination circuit U22 can be according to power input VCHG, charging end VBAT
Judge five kinds of working conditions with sampled signal end Isen signal, be respectively：During in first state, state end A ends are height
Level, remaining state end B, C, D, E end is low level；During in the second state, state end B ends are high level, remaining state end
A, C, D, E end are low level；During in the third state, state end C-terminal is high level, and remaining state end A, B, D, E end is low electricity
It is flat；During in four states, state end D ends are high level, and remaining state end A, B, C, E end is low level；In the 5th state
When, state end E ends are high level, and remaining state end A, B, C, D end is low level.
As shown in Figure 4, the circuit theory diagrams for being drive circuit U24 in Fig. 2, it is single that the drive circuit includes switching switch
Member and a driving switch, the switching switch element can be switched using five independent switchings as shown in this embodiment
S1, S2, S3, S4, S5, it would however also be possible to employ other switching devices with same or similar function, the driving switch are used to drive
External indicating device is moved, realizes that state end A, B, C, D, E end connects and controls switching to open respectively using nmos switch MN2
S1, S2, S3, S4, S5 switching control end are closed, described switching switch S1, S2, S3, S4, S5 output end are all connected to NMOS and opened
MN2 grid (i.e. the operating side of driving switch) is closed, it is defeated that the input that the switching switchs S1, S2, S3, S4 connects power supply respectively
Enter to hold VCHG, ground terminal, oscillator OSC CLK1 ends, oscillator OSC CLK2 ends, the Ramp ends of the oscillator OSC pass through one
Individual amplifier OP1 is connected to the input of the switching switch S5, i.e., described switching switch S1, S2, S3, S4, S5 input
Obtain five kinds of different state representation signals.The drain electrode (i.e. the drive end of driving switch) of the nmos switch MN2 is used to connect
Connect and drive external indicating device (such as light emitting diode), as L3 ends, source electrode is grounded through resistance R4.
Described switching switch S1, S2, S3, S4, S5 are according to the status signal received from the status determination circuit, i.e. shape
The status signal at state end A, B, C, D, E end, by corresponding five kinds of state representation signals be switched to switching switch S1, S2, S3, S4,
S5 output end, and then the drain electrode of the nmos switch MN2 is exported corresponding drive signal.When state end A ends are high level
When, state end B~E ends are all low level, now switching switch S1 conductings, and nmos switch MN2 grid is switched through the switching
S1 switches on power input VCHG, and equivalent to access high level signal, nmos switch MN2 is in fully on state, its L3 end
Electric current substantially determined by (UCHG-Uth)/r2, wherein UCHG be power input VCHG voltage, equivalent to high level letter
Number, Uth is nmos switch MN2 threshold voltage, and r2 is resistance R2 resistance value, the light emitting diode being now connected with L3 ends
LED3 is normal bright state.When state end B ends are high level, and other state ends are all low level, the grid of the nmos switch MN2
Pole switchs S2 through the switching and is grounded, and equivalent to access low level signal, the nmos switch MN2 is off state, L3
No electric current is held to pass through, the LED 3 being now connected with L3 ends is in state of often going out.When state end C-terminal is high electricity
When flat and remaining state end is all low level, the grid of the nmos switch MN2 switchs S3 through the switching and connects oscillator
OSC CLK1 end signals, CLK1 ends are output as the square-wave signal of slower frequency (such as frequency range is 0.1 hertz~1 hertz),
The LED 3 being now connected with L3 ends is in slower frequency scintillation state.When state end D be high level and other
When signal end is low level, the grid of the nmos switch MN2 switchs the CLK2 ends letter that S4 connects oscillator OSC through the switching
Number, CLK2 ends are output as the square-wave signal of very fast frequency (such as frequency range is 1 hertz~50 hertz), are now connected with L3 ends
LED 3 be in very fast frequency scintillation state.When state end E is high level and remaining state end is all low electricity
Usually, the grid of the nmos switch MN2 switchs the output end that S5 is connected to operational amplifier OP1 through the switching, described
One output end Ramp end of oscillator is connected to the input in the same direction of the operational amplifier OP1, the operational amplifier OP1
Reverse input end be connected between the source electrode of the nmos switch and the feedback resistance R4, operational amplifier OP1 control
Voltage on resistance R4 processed is equal to the triangular signal that the Ramp ends of the oscillator OSC are exported, because the electric current at L3 ends is equal to
Resistance R4 electric current, equal to URamp/r4, wherein URamp is the magnitude of voltage that Ramp ends are exported, and r4 is resistance R4 resistance value.When
When Ramp signals are triangular wave, URamp is gradually changed, in the alternating change procedure for becoming larger and tapering into, now with
The electric current of the connected LED 3 in L3 ends is also at the alternating change procedure for becoming larger and tapering into, and makes LED3 bright
Gradually gradual process is presented in degree.
Fig. 5 is the circuit theory diagrams with the charger of charge management circuit in Fig. 2, and charge management circuit U2 passes through VBAT
Hold to battery BAT and charge, connected by L3 ends and drive LED 3, realize the display to current charged state,
The LED 3 is also associated with a pull-up resistor R3.In addition, the driving current of the LED3 can also be by charging
Manage the resistance R4 inside circuit to set and adjust, therefore, the resistance R3 can be omitted, and help further to reduce charger
Cost and reduce circuit board space.In addition, the LED 3 can also be replaced using other indicating devices, with people
Eyesight and hearing be easy to divide into selection standard.
It can be seen from foregoing description, charge management circuit U2 only one of which port L3 ends of the invention are luminous to drive
Diode (LED) 3, instruction state includes：(1) L3 ends are in off state, and LED 3 is in OFF state.(2)L3
End is in a certain slower frequency switching frequency (such as frequency range：0.1 hertz~1 hertz) continuous on off state, luminous two
Pole pipe LED3 is in corresponding with slower frequency scintillation state.(3) L3 ends are in a certain very fast switching frequency (such as frequency model
Enclose：1 hertz~50 hertz) continuous on off state, LED 3 is in corresponding with very fast frequency scintillation state.(4)
L3 ends are in normal ground state, and LED 3 is in normal bright state.(5) L3 ends output triangular signal, light-emitting diodes
Pipe LED3 is in slow by secretly brightening and then by bright dimmed alternating gradual change state.
According to above preferred embodiment, among practical application, the display effect under different charged states can be arbitrarily defined
Really, you can with state end A, B, C, D, E end of the output of status determination circuit and the drive circuit are inputted state end A,
B, C, D, E end are arbitrarily matched as needed, and the state end A ends connection drive circuit of the output of such as status determination circuit is defeated
The state end C-terminal entered, i.e. when battery full state, LED 3 is represented with slower frequency scintillation.
As the simplification of above-described embodiment, in above preferred embodiment, five states in the status determination circuit are sentenced
Disconnected unit, three therein or four can be selected according to actual needs, corresponding, the drive circuit also chooses respective numbers
Switching switch, and with the state representation signal that is connected of switching switch input terminal.
For example, S1, S2, S3 only are switched from the corresponding connection switching of first, second, third condition adjudgement unit, now,
With three kinds of following state representations.
(1) when state end A ends are high level, and other state ends are low level, nmos switch MN2 grid is high electricity
Flat, nmos switch MN2 is in fully on state, and L3 ends are in normal ground state, and LED3 shows as Chang Liang.(2) as state end B
Hold as high level, when other state ends are all low level, the grid of the nmos switch MN2 is ground connection, equivalent to accessing low electricity
Ordinary mail number, the nmos switch MN2 is off state, and L3 ends do not have electric current process, and L3 ends are in off state, light-emitting diodes
Pipe LED3 is in OFF state.(3) when state end C-terminal is high level and remaining state end is all low level, the NMOS is opened
The square-wave signal of MN2 gate turn-on oscillator OSC outputs is closed, L3 ends are in a certain frequency (such as frequency range：0.1 hertz
Hereby~50 hertz) continuous on off state, LED3 shows as flicker state.
Other embodiments can be so that the rest may be inferred.Certainly, if the status determination circuit of design has six or more
State end, i.e., can judge the state of six or more, can also accordingly increase it is described switching switch number, and
The state representation signal kinds being connected with the switching switch input terminal.For example, filling of producing of existing charging control circuit
Electric current, including precharge, constant-current charge, constant-voltage charge Three models, also can be to precharge, constant-current charge, constant-voltage charge three
Plant charged state and distinguish expression.
A kind of charge management circuit and charger provided by the present invention are described in detail above, it is used herein
Specific case is set forth to the principle and embodiment of the present invention, and the explanation of above example is only intended to help and understands
The method and its core concept of the present invention；Simultaneously for those of ordinary skill in the art, according to the thought of the present invention, in tool
It will change in body embodiment and application, in summary, this specification content should not be construed as to the present invention
Limitation.
Claims (9)
1. a kind of charge management circuit, including the control that is used for being sequentially connected produce the charging control circuit of charging current and are used for
Judge the status determination circuit of present charge state, it is characterised in that：Also include the driving electricity for being used to drive external indicating device
Road, the drive circuit includes a switching switch element and driving switch, the switching control end of the switching switch element with
The status determination circuit is connected, and the input of the switching switch element is used to access at least three kinds different state representations
Signal, the output end of the switching switch element is connected to the operating side of the driving switch, the drive end of the driving switch
Connect the external indicating device, the switching switch element according to the status signal received from the status determination circuit,
Corresponding state representation signal is switched to the output end of the switching switch element, and then makes the drive end of the driving switch
Export corresponding drive signal；
Driving switch in the drive circuit is nmos switch, the grid of the nmos switch as the driving switch behaviour
Make end, the drain electrode of the nmos switch is as the drive end of the driving switch, and the source electrode of the nmos switch is anti-by one
Resistance eutral grounding is presented, one of output end of oscillator is connected to an input of an operational amplifier, and the computing is put
Another input of big device is connected between the source electrode of the nmos switch and the feedback resistance, the operational amplifier it is defeated
The input for going out end with the switching switch element is connected.
2. charge management circuit according to claim 1, it is characterised in that：It is described switching switch element include with it is described defeated
Enter to hold quantity to switch switch accordingly, the status determination circuit has corresponding with the switching switch element input quantity
State end, the input of the switching switch element is as each input for switching switch, respectively with the status determination circuit
Each state end correspondence connect, each switching switch is according to the status signal that is received from the status determination circuit, correspondence
The one of switching switch of connection, corresponding state representation signal is switched to the output end of the switching switch element.
3. charge management circuit according to claim 1 or 2, it is characterised in that：The charging end of the charging control circuit
It is connected respectively with the charging end and sampled signal end of the status determination circuit with sampled signal end；
The status determination circuit includes first state judging unit, the second condition adjudgement unit and third state judging unit,
The first state judging unit include first voltage comparator, current comparator and with door, the voltage comparator it is positive and negative
Input connect respectively charging end and with the first reference voltage end, the positive-negative input end of the current comparator connects reference respectively
Current terminal and the sampled signal end, the output end of the first voltage comparator and current comparator is respectively with described with door
Two inputs are connected, and the output end with door is the output end of first state judging unit；The second condition adjudgement unit
Including second voltage comparator, the positive-negative input end of the second voltage comparator connects the second reference voltage end and described respectively
Charging end, the output end of the second voltage comparator is the output end of the second condition adjudgement unit；The third state
Judging unit includes a nor gate, and two inputs of the nor gate connect the first state judging unit and second respectively
The output end of condition adjudgement unit, the output end of the nor gate is the output end of the third state judging unit.
4. charge management circuit according to claim 3, it is characterised in that：The status determination circuit includes the 4th state
Judging unit, the 4th condition adjudgement unit includes tertiary voltage comparator and a timer, and the tertiary voltage compares
The positive-negative input end of device connects power input and the 3rd reference voltage end respectively, and output end connects the clock of the timer
End, the output end of the first state judging unit connects the reset terminal of the timer, and the output end of the timer is institute
State the output end of the 4th condition adjudgement unit.
5. charge management circuit according to claim 3, it is characterised in that：The status determination circuit includes the 5th state
Judging unit, including tertiary voltage comparator and a phase inverter, the positive-negative input end of the tertiary voltage comparator connect respectively
Power input and the 3rd reference voltage end are connect, output end connects the input of the phase inverter, the output of the phase inverter
Hold as the output end of the 5th condition adjudgement unit.
6. charge management circuit according to claim 1, it is characterised in that：The state representation signal is believed for high level
Number, low level signal, the square-wave signal of one or more frequency, at least three in the triangular signal of one or more frequencies
Kind.
7. charge management circuit according to claim 6, it is characterised in that：Also including one in the drive circuit is used for
The oscillator of the state representation signal is exported, the oscillator output includes the square-wave signal of one or more frequencies, or/and
The triangular signal of one or more frequencies.
8. charge management circuit according to claim 6, it is characterised in that：In the low electricity as state representation signal
Ordinary mail number, when being connected to the operating side of driving switch through the switching switch element, the driving switch cut-off；It is being used as shape
State represents the high level signal of signal, described when being connected to the operating side of driving switch through the switching switch element
Driving switch is turned on；In the square-wave signal as state representation signal, driving is connected to through the switching switch element
During the operating side of switch, the driving switch is switched with corresponding frequency between conducting and cut-off；Believe as state representation
Number the triangular signal, through it is described switching switch element be connected to the operating side of driving switch when, the driving switch
The alternating variable-current for becoming larger and tapering into is provided with corresponding frequency.
9. a kind of charger with charge management circuit any one of the claims 1-8, it is characterised in that：Including
One light emitting diode, the drive end of the driving switch connects and drives the light emitting diode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410649154.3A CN104333086B (en) | 2014-11-14 | 2014-11-14 | A kind of charge management circuit and charger |
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| CN201410649154.3A CN104333086B (en) | 2014-11-14 | 2014-11-14 | A kind of charge management circuit and charger |
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| CN104333086A CN104333086A (en) | 2015-02-04 |
| CN104333086B true CN104333086B (en) | 2017-09-26 |
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| CN201410649154.3A Active CN104333086B (en) | 2014-11-14 | 2014-11-14 | A kind of charge management circuit and charger |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101931249A (en) * | 2009-06-25 | 2010-12-29 | 鸿富锦精密工业（深圳）有限公司 | Electronic device capable of indicating battery charged state |
| CN102856940A (en) * | 2011-06-30 | 2013-01-02 | 鸿富锦精密工业（深圳）有限公司 | Electronic device and charger capable of indicating battery charging state |
| CN204167970U (en) * | 2014-11-14 | 2015-02-18 | 无锡中星微电子有限公司 | Charge management circuit and charger |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07282858A (en) * | 1994-04-12 | 1995-10-27 | Canon Inc | Charging method, charging display method, and battery charger for secondary battery |
| CN102905443B (en) * | 2012-10-31 | 2014-12-10 | 上海小糸车灯有限公司 | Linear constant-current and current-sharing LED drive circuit and circuit board structure thereof |
-
2014
- 2014-11-14 CN CN201410649154.3A patent/CN104333086B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101931249A (en) * | 2009-06-25 | 2010-12-29 | 鸿富锦精密工业（深圳）有限公司 | Electronic device capable of indicating battery charged state |
| CN102856940A (en) * | 2011-06-30 | 2013-01-02 | 鸿富锦精密工业（深圳）有限公司 | Electronic device and charger capable of indicating battery charging state |
| CN204167970U (en) * | 2014-11-14 | 2015-02-18 | 无锡中星微电子有限公司 | Charge management circuit and charger |
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| CN104333086A (en) | 2015-02-04 |
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