CN109861329A - Linear charging systems, constant-current and constant-voltage control circuit and its voltage follow control method - Google Patents
Linear charging systems, constant-current and constant-voltage control circuit and its voltage follow control method Download PDFInfo
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Abstract
The present invention provides a kind of linear charging systems, constant-current and constant-voltage control circuit and its voltage follow control method, including constant-current and constant-voltage control circuit, the power supply input circuit of power supply and the battery modules of energy storage；Wherein, constant-current and constant-voltage control circuit includes: current sample pipe, output power pipe, the identical voltage follow control module of drain voltage for controlling current sample pipe and output power pipe, the grid control module based on voltage sample feedback signal and current sample feedback signal adjustment current sample pipe and output power tube grid voltage.Linear charging systems, constant-current and constant-voltage control circuit and its voltage follow control method of the invention is connected on current sample branch road N-type by Linear Control and adjusts tube impedance, no starting current overshoot, it solves the problems, such as that linear-charging management has current over pulse on startup or even what is resulted from constantly restarts, and can simplify partial circuit；And output electric current still maintains high-precision current amplification factor when output voltage is lower.
Description
Technical field
The present invention relates to IC design and application fields, more particularly to a kind of linear charging systems, constant current constant voltage
Control circuit and its voltage follow control method.
Background technique
For many years, various linear-charging management IC (integrated circuit) have obtained tremendous development and extensive use, to realize
The control of constant current constant voltage output in battery charging, in the battery management applied to various portable equipments.
The leakage of current sample pipe drain electrode and output power pipe is realized by controlling impedance and the pressure drop of P pipe in the prior art
Pole tension is consistent, but due to P pipe conducting when the grid voltage of P pipe is low level, deposits the risk of current over pulse on startup.Cause
This, it is in the prior art to will increase anti-overshoot protection, such as constant current constant voltage is closed when the voltage at electric current setting end is greater than 1.2V
Control module, still, sample rate current branch meeting flip chip closes work in the case where severe or chip is constantly restarted,
Make chip cisco unity malfunction, as shown in figure 3, chip is started to work after input power VIN arrives, when anti-overshoot protection rises
(anti-overshoot protection is carried out when anti-overshoot protection signal SHDN high level) when effect, constant current constant voltage control module is closed, constant current constant voltage
The output electric current of control module declines；When the failure of anti-overshoot protection (without anti-when anti-overshoot protection signal SHDN low level
Overshoot protection), constant current constant voltage control module is opened, and the output electric current of constant current constant voltage control module rises；Repeatedly restart repeatedly, core
Piece can not work.In addition, the drain voltage of current sample pipe can not follow output power pipe due to the clamper of P pipe source grid
Drain voltage causes output power pipe and current sample pipe current amplification factor deviation in set multiple.
In conclusion it is constantly heavy to evade the closing of sample rate current branch flip chip or chip to find a kind of method or technique
The risk opened allows output electric current to still maintain current amplification factor when output voltage is lower more accurate, it has also become this field skill
One of art personnel's urgent problem to be solved.
Summary of the invention
In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide a kind of linear charging systems, constant current
Constant-voltage control circuit and its voltage follow control method, frequently restart for solving constant current constant voltage control chip in the prior art,
The problem of voltage follow precision is low equal.
In order to achieve the above objects and other related objects, the present invention provides a kind of constant-current and constant-voltage control circuit, the constant current
Constant-voltage control circuit includes at least:
Current sample pipe, output power pipe, voltage follow control module, output voltage sampling module and grid control mould
Block；
The source electrode of the current sample pipe connects input power, and grid connects the output end of the grid control module, leaks
Pole connects the first end of sampling resistor after the voltage follow control module, and the second end ground connection of the sampling resistor is described
Current sample pipe is for generating sample rate current；
The source electrode of the output power pipe connects the input power, and grid connects the output of the grid control module
End, drain electrode connect the output voltage sampling module, for adjusting output electric current；
The voltage follow control module is connected to the drain electrode of the current sample pipe and the output power pipe, for controlling
The drain voltage for making the current sample pipe follows the drain voltage of the output power pipe, wherein the voltage follow control
Module includes operational amplifier and N-type adjustment pipe；The input terminal of the operational amplifier be separately connected the current sample pipe and
The drain electrode of the output power pipe；Draining for the N-type adjustment pipe connects the drain electrode of the current sample pipe, described in source electrode connection
The first end of sampling resistor, grid connect the output end of the operational amplifier；
The grid control module connects the first end of the output voltage sampling module and the sampling resistor, will be described
The voltage sample feedback signal of output voltage sampling module output is compared with the first calibration voltage, will be on the sampling resistor
Current sample feedback signal be compared with the second calibration voltage, and adjust the current sample pipes based on two comparison results
And the grid voltage of the output power pipe, and then control output voltage values.
Optionally, the constant-current and constant-voltage control circuit further includes constant current calibration point selection module, and the constant current calibration clicks
The drain electrode that module connects the output power pipe is selected, the drain voltage of the output power pipe is compared with the first benchmark,
And output constant current calibration point selection signal is with the value of determination first calibration voltage.
More optionally, the constant-current and constant-voltage control circuit further includes completely filling determination module, described completely to fill determination module connection
The current sample feedback signal is compared by the first end of the sampling resistor with the second benchmark, and output phase should expire and fill
Judge signal.
More optionally, the determination module that completely fills includes comparing unit and NAND Logic unit；The comparing unit it is defeated
Enter end and is separately connected the current sample feedback signal and second benchmark；The input terminal of the NAND Logic unit connects respectively
The output end for connecing the comparing unit and constant current calibration point selection module, when the drain voltage of the output power pipe is greater than
First benchmark and the current sample feedback signal when being less than second benchmark described completely fill judge signal action.
More optionally, the constant-current and constant-voltage control circuit further includes completely filling shutdown module, described completely to fill shutdown block coupled in series
In the output power pipe power supply into ground access, it is described completely fill shutdown module control terminal connection it is described completely fills judgement letter
Number.
Optionally, the constant-current and constant-voltage control circuit further includes substrate selecting module, and the substrate selecting module includes the
One diode and the second diode；The anode of the first diode connects the input power, and cathode connects the electric current and adopts
The substrate of sample pipe and the output power pipe；The cathode of second diode connects the cathode of the first diode, anode
Connect the drain electrode of the output power pipe.
Optionally, the constant-current and constant-voltage control circuit further includes reference voltage generation module, and the reference voltage generates mould
Block receives the input power, and reference voltage and school in the constant-current and constant-voltage control circuit are generated based on the input power
Quasi- voltage.
Optionally, the constant-current and constant-voltage control circuit further includes pull-up current source, one end connection in the pull-up current source
The input power, the other end connect the first end of the sampling resistor.
Optionally, the constant-current and constant-voltage control circuit further includes pull-down current source, one end connection in the pull-down current source
The output end of the grid control module, other end ground connection.
In order to achieve the above objects and other related objects, the present invention provides a kind of linear charging systems, the linear-charging
System includes at least:
Above-mentioned constant-current and constant-voltage control circuit, power supply input circuit and battery modules；
The power supply input circuit connects the constant-current and constant-voltage control circuit, provides for the constant-current and constant-voltage control circuit defeated
Enter power supply；
The battery modules are connected to the drain electrode of the output power pipe, defeated for receiving the constant-current and constant-voltage control circuit
Electrical energy for storage out.
Optionally, the linear charging systems further include charging indication, and the control terminal of the charging indication connects
Connect it is described completely fill judgement signal, when the linear charging systems stop charge when turn off the charging indication.
In order to achieve the above objects and other related objects, the present invention provides a kind of voltage of above-mentioned constant-current and constant-voltage control circuit
The voltage follow control method of follow-up control method, the constant-current and constant-voltage control circuit includes at least:
Compare the drain voltage of current sample pipe Yu output power pipe, and based on the current sample pipe and the output work
The impedance of the drain voltage difference Serial regulation of rate pipe and the concatenated N-type adjustment pipe of the current sample pipe, makes the current sample
The drain voltage of pipe follows the drain voltage of the output power pipe.
Optionally, when the drain voltage of the output power pipe is higher than the drain voltage of the current sample pipe, increase
The impedance of the N-type adjustment pipe, so that the drain voltage of the current sample pipe increases；Conversely, when the output power pipe
When drain voltage is lower than the drain voltage of the current sample pipe, reduce the impedance of the N-type adjustment pipe, so that the electric current is adopted
The drain voltage of sample pipe reduces；Until the current sample pipe is equal with the drain voltage of the output power pipe.
Optionally, the output electric current of the constant-current and constant-voltage control circuit meets following relational expression:
Wherein, IBATFor the output electric current of the constant-current and constant-voltage control circuit, IM2For the electricity for flowing through the output power pipe
Stream, K are the real number greater than 1, IM1For the electric current for flowing through the current sample pipe, VPROGFor the electricity of the current sample feedback signal
Pressure value, RSFor the resistance value of the sampling resistor.
Optionally, the output voltage of the constant-current and constant-voltage control circuit meets following relational expression:
Wherein, VBATFor the output voltage of the constant-current and constant-voltage control circuit, VFBFor the electricity of the voltage sample feedback signal
Pressure value,For the ratio of sampling resistor in the output voltage sampling module.
As described above, linear charging systems of the invention, constant-current and constant-voltage control circuit and its voltage follow control method, tool
Have it is following the utility model has the advantages that
Linear charging systems, constant-current and constant-voltage control circuit and its voltage follow control method of the invention passes through Linear Control
It is connected on current sample branch road N-type adjustment tube impedance, no starting current overshoot solves linear-charging management and exists on startup
Continuous the problem of restarting that current over pulse even results from, and can simplify partial circuit；And output electric current is in output voltage
High-precision current amplification factor is still maintained when lower.
Detailed description of the invention
Fig. 1 is shown as the schematic illustration that constant current constant voltage control chip in the prior art is frequently restarted.
Fig. 2 is shown as the structural schematic diagram of constant-current and constant-voltage control circuit of the invention.
Fig. 3 is shown as the schematic illustration of constant-current and constant-voltage control circuit of the invention.
Fig. 4 is shown as the structural schematic diagram of linear charging systems of the invention.
Component label instructions
01 linear charging systems
1 constant-current and constant-voltage control circuit
11 voltage follow control modules
111 operational amplifiers
12 output voltage sampling modules
Point selection module is calibrated in 13 constant currents
14 grid control modules
15 completely fill determination module
151 comparing units
152 NAND Logic units
16 substrate selecting modules
17 reference voltage generation modules
2 power supply input circuits
3 battery modules
31 cell loads
4 charging indications
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.
Please refer to Fig. 2~Fig. 4.It should be noted that diagram provided in the present embodiment only illustrates this in a schematic way
The basic conception of invention, only shown in schema then with related component in the present invention rather than package count when according to actual implementation
Mesh, shape and size are drawn, when actual implementation kenel, quantity and the ratio of each component can arbitrarily change for one kind, and its
Assembly layout kenel may also be increasingly complex.
Embodiment one
As shown in Fig. 2, the constant-current and constant-voltage control circuit 1 wraps the present embodiment provides a kind of constant-current and constant-voltage control circuit 1
It includes:
Current sample pipe M1, output power pipe M2, voltage follow control module 11, output voltage sampling module 12, constant current
Calibrate point selection module 13 and grid control module 14.
As shown in Fig. 2, the source electrode of the current sample pipe M1 connects input power VIN, grid connects the grid control
The output end of module 14 drains and connects the first end of sampling resistor Rs, the sampling after the voltage follow control module 11
The second end of resistance Rs is grounded GND, and the current sample pipe M1 is for generating sample rate current.
Specifically, in the present embodiment, the current sample pipe M1 is P-type transistor, and including but not limited to insulated gate is double
Bipolar transistor, Metal-Oxide Semiconductor field effect transistor, will not repeat them here.
As shown in Fig. 2, the source electrode of the output power pipe M2 connects the input power VIN, grid connects the grid
The output end of control module 14, drain electrode connect the output voltage sampling module 12, for adjusting output electric current.
Specifically, in the present embodiment, the output power pipe M2 is P-type transistor, and including but not limited to insulated gate is double
Bipolar transistor, Metal-Oxide Semiconductor field effect transistor, will not repeat them here.The output power pipe M2 and institute
The type of device for stating current sample pipe M1 is identical, and breadth length ratio is configured as needed, in the present embodiment, the output power
The breadth length ratio ratio of the pipe M2 and current sample pipe M1 is 1000:1.
As shown in Fig. 2, the voltage follow control module 11 is connected to the current sample pipe M1 and the output power
The drain electrode of pipe M2, the drain voltage VTR for controlling the current sample pipe M1 follow the drain electrode electricity of the output power pipe M2
Press BAT.
Specifically, in the present embodiment, the voltage follow control module 11 includes that operational amplifier 111 and N-type adjust
Pipe N1.The input terminal of the operational amplifier 111 is separately connected the leakage of the current sample pipe M1 and the output power pipe M2
Pole, in the present embodiment, the normal phase input end of the operational amplifier 111 connect the drain electrode of the current sample pipe M1, described
The inverting input terminal of operational amplifier 111 connects the drain electrode of the output power pipe M2, in actual use, can be anti-by increasing
Phase device replaces the relationship of input signal and input port, need to only meet logical relation.The drain electrode of the N-type adjustment pipe N1 connects
The drain electrode of the current sample pipe M1 is connect, source electrode connects the first end of the sampling resistor Rs, and grid connects the operation amplifier
The output end of device 111, when the output voltage VMA of the operational amplifier 111 is high level, the N-type adjusts the impedance of pipe N1
Reduce, the impedance that the N-type adjusts pipe N1 when the output voltage VMA of the operational amplifier 111 is low level increases, and passes through
N-type described in the output voltage VMA Linear Control of the operational amplifier 111 adjusts the impedance of pipe N1, so that the current sample
The drain voltage of pipe M1 follows the drain voltage of the output power pipe M2.
As a kind of implementation of the present embodiment, the constant-current and constant-voltage control circuit 1 further includes pull-up current source S1, institute
The one end for stating pull-up current source S1 connects the input power VIN, and the other end connects the first end of the sampling resistor Rs.
As shown in Fig. 2, the output voltage sampling module 12 is connected to the drain electrode of the output power pipe M2, it is used for institute
The voltage ratio for stating 1 output end BAT of constant-current and constant-voltage control circuit reduces.
Specifically, in the present embodiment, the output voltage sampling module 12 includes first resistor R1 and second resistance R2,
The first resistor R1 connects with the second resistance R2, realizes voltage sample by partial pressure, obtains voltage sample feedback signal
FB.The circuit for being able to achieve sampling of arbitrary structures, random devices can be used in the output voltage sampling module 12, herein not one by one
It repeats.
As shown in Fig. 2, the constant current calibration point selection module 13 connects the drain electrode of the output power pipe M2, it will be described defeated
The drain voltage of power tube M2 is compared with the first benchmark out, and output constant current calibration point selection signal TRICK.
Specifically, in the present embodiment, the constant current calibration point selection module 13 includes comparator, and the comparator is just
Phase input terminal connects the drain electrode (the output end BAT of the i.e. described constant-current and constant-voltage control circuit 1) of the output power pipe M2, the ratio
First benchmark is connected compared with the inverting input terminal of device, the constant current calibration point selection module 13 exports the constant current calibration and clicks
Select signal TRICK.In actual use, the relationship that input signal and input port can be replaced by increasing phase inverter, need to only expire
Sufficient logical relation, is not limited to this embodiment.First benchmark can do according to the device parameters of actual circuit and specifically set
It is fixed, it is not limited to this embodiment, in the present embodiment, first benchmark is 2.9V.
As shown in Fig. 2, the grid control module 14 connects the output voltage sampling module 12 and the sampling resistor
The voltage sample feedback signal FB is compared by the first end of Rs with the first calibration voltage, will be on the sampling resistor Rs
Current sample feedback signal PROG be compared with the second calibration voltage, and adjust the electric currents based on two comparison results and adopt
The grid voltage of sample pipe M1 and the output power pipe M2, and then control the output end BAT of the constant-current and constant-voltage control circuit 1
Voltage value.
Specifically, in the present embodiment, first calibration voltage is set as 1.2V, in actual use, can be according to institute
State first resistor R1, the resistance value of the second resistance R2, the value range of output voltage BAT setting the first calibration electricity
The value of pressure, is not limited to this embodiment.In the present embodiment, the value of second calibration voltage is selected by the constant current calibration point
The selection of module 13 determines that the voltage of the output end BAT of the constant-current and constant-voltage control circuit 1 is greater than corresponding when first benchmark
The value of second calibration voltage is less than described first relative to the voltage of the output end BAT of the constant-current and constant-voltage control circuit 1
The value of corresponding second calibration voltage is larger when benchmark, and specific value can be according to device parameters and using being set
Fixed, in the present embodiment, the voltage of the output end BAT of the constant-current and constant-voltage control circuit 1 is greater than corresponding when first benchmark
The value of second calibration voltage be 1V, the voltage of the output end BAT of the constant-current and constant-voltage control circuit 1 is less than described first
The value of corresponding second calibration voltage is 0.2V when benchmark；That is, working as VBATWhen >=2.9V, second calibration voltage is 1V,
Work as VBATWhen < 2.9V, second calibration voltage is 0.2V, is not limited to this embodiment.
It should be noted that in actual use, second calibration voltage can be a fixed value, then the constant current is not necessarily to
Calibrate point selection module 13.In the present embodiment, increase the constant current calibration point selection module 13, according to the voltage of output end BAT
Height come select output electric current gear.
As a kind of implementation of the present embodiment, the constant-current and constant-voltage control circuit 1 further includes pull-down current source S2, institute
The one end for stating pull-down current source S2 connects the output end of the grid control module 14, other end ground connection.
As a kind of implementation of the present embodiment, the constant-current and constant-voltage control circuit 1 further includes completely filling determination module 15,
The first end completely filled determination module 15 and connect the sampling resistor Rs, by the current sample feedback signal PROG and second
Benchmark is compared, and output phase should expire to fill and judge signal STANDBY.
Specifically, in the present embodiment, the determination module 15 that completely fills includes comparing unit 151 and NAND Logic unit
152.The input terminal of the comparing unit 151 is separately connected the current sample feedback signal PROG and second benchmark,
In the present embodiment, the normal phase input end of the comparing unit 151 connects second benchmark, the positive of the comparing unit 151
Input terminal connects the current sample feedback signal PROG.In actual use, input signal can be replaced by increasing phase inverter
With the relationship of input port, it only need to meet logical relation, be not limited to this embodiment.The NAND Logic unit 152
Input terminal is separately connected the output end of the comparing unit 151 and constant current calibration point selection module 13, when the output work
The drain voltage of rate pipe M2 is greater than first benchmark and when the current sample feedback signal PROG is less than second benchmark
Described completely fill judges that signal STANDBY works, and in the present embodiment, the NAND Logic unit 152 is realized using NAND gate,
The circuit structure for being arbitrarily able to achieve NAND Logic can be used in actual use, will not repeat them here.
As a kind of implementation of the present embodiment, the constant-current and constant-voltage control circuit 1 further includes completely filling shutdown module, institute
State completely fill shutdown block coupled in series in the output power pipe M2 power supply into ground access, it is described completely fill shutdown module control terminal
It connects described completely fill and judges signal STANDBY.
Specifically, in the present embodiment, the shutdown module of completely filling is realized using N type switch tube N2, the N type switch tube
N2 is connected between the output voltage sampling module 12 and ground GND, and the drain electrode of the N type switch tube N2 connects the output electricity
Sampling module 12 is pressed, the source electrode ground connection of the N type switch tube N2, the grid connection of the N type switch tube N2 is described completely to fill judgement
Signal STANDBY.In actual use, it is described completely fill shutdown module can be arbitrarily completely fill judge signal STANDBY expression
By the power supply of the output power pipe M2 to ground access dead circuit structure when completely to fill, the setting position be not limited to the present embodiment
It sets and part category.
As a kind of implementation of the present embodiment, the constant-current and constant-voltage control circuit 1 further includes substrate selecting module 16,
The substrate selecting module 16 includes first diode D1 and the second diode D2.The anode of the first diode D1 connects institute
Input power VIN is stated, the cathode of the first diode D1 connects the current sample pipe M1's and output power pipe M2
Substrate；The cathode of the second diode D2 connects the cathode of the first diode D1, the anode of the second diode D2
Connect the drain electrode of the output power pipe M2.
As a kind of implementation of the present embodiment, the constant-current and constant-voltage control circuit 1 further includes that reference voltage generates mould
Block 17, the reference voltage generation module 17 receive the input power VIN, and based on described in input power VIN generation
Each reference voltage and calibration voltage in constant-current and constant-voltage control circuit 1, including but not limited to described first benchmark (2.9V), institute
The second benchmark (0.1V), first calibration voltage (1.2V), second calibration voltage (1V or 0.2V) and input is stated to power on
Voltage meets the signal VOK of job requirement afterwards.
The working principle of the constant-current and constant-voltage control circuit 1 is as follows:
1) drain voltage of current sample pipe M1 is made to follow the drain voltage of output power pipe M2, voltage based on voltage follow
Follow-up control method includes:
Specifically, compare the drain voltage of current sample pipe M1 Yu output power pipe M2, and be based on the current sample pipe
The concatenated N-type adjustment pipe N1's of the drain voltage difference Serial regulation and the current sample pipe M1 of the M1 and output power pipe M2
Impedance makes the drain voltage of the current sample pipe M1 follow the drain voltage of the output power pipe M2.
More specifically, when the drain voltage of the output power pipe M2 is higher than the drain voltage of the current sample pipe M1
When, the operational amplifier 111 exports low level, and the impedance of the N-type adjustment pipe N1 increases, the leakage of the current sample pipe M1
Pole tension increases；Conversely, when the drain voltage of the output power pipe M2 is lower than the drain voltage of the current sample pipe M1,
The operational amplifier 111 exports high level, and the impedance of the N-type adjustment pipe N1 reduces, the drain electrode of the current sample pipe M1
Voltage reduces；Make the current sample pipe M1 and the output power by the impedance Serial regulation to N-type adjustment pipe N1
The drain voltage of pipe M2 is equal.
It should be noted that adjusting the impedance of pipe N1 by N-type described in Linear Control to make the current sample pipe M1's
Drain voltage follows the drain voltage of the output power pipe M2, when being that grid source pressure difference is low due to the characteristics of N-type transistor not
Conducting, grid source pressure difference just can linearly be connected when linearly increasing, and therefore, the electric current for flowing through the current sample pipe M1 was not in
Punching.As shown in figure 3, VOK works after the input power VIN arrives, the output voltage VMA of the operational amplifier 111 and institute
It states current sample feedback signal PROG and generates corresponding level, the output electric current I of the constant-current and constant-voltage control circuit 1BATStablize defeated
Out, do not occur overshoot phenomenon, it is therefore not necessary to anti-overshoot protection in the prior art, circuit structure is simple, and there is no frequently restart
Risk.
It should be noted that when N-type adjustment pipe N1 is fully on, the drain voltage of the current sample pipe M1
The voltage value of VTR can be in close proximity to the voltage value V of the current sample feedback signalPROG, therefore work as the constant current constant voltage
The output voltage of control circuit 1 still maintains the Current amplifier of the output power pipe M2 Yu the current sample pipe M1 when lower
Multiple is not in deviation.
2) based on voltage sample feedback signal FB and current sample feedback signal PROG adjust the current sample pipe M1 and
The grid voltage of the output power pipe M2, control constant output current, output voltage are constant.
Specifically, when the voltage value of the voltage sample feedback signal FB is higher than described first calibration voltage (the present embodiment
In be 1.2V) when, by the grid voltage of the current sample pipe M1 and the output power pipe M2 adjust reduce；When the voltage
When the voltage value of sampled feedback signal FB is lower than first calibration voltage, by the current sample pipe M1 and the output power
The grid voltage of pipe M2, which adjusts, to be increased.When the voltage of the current sample feedback signal PROG is higher than second calibration voltage
(when calibrating point selection module 13 by the constant current in the present embodiment and selecting second calibration voltage as 1V or 0.2V), by institute
The grid voltage adjustment for stating the current sample pipe M1 and output power pipe M2 reduces；As the current sample feedback signal PROG
Voltage be lower than second calibration voltage when, by the grid voltage tune of the current sample pipe M1 and the output power pipe M2
Whole raising.
It should be noted that by the voltage follow control method, the current sample pipe M1 and the output power
The voltage of three poles of pipe M2 is consistent, so that the electric current of the current sample pipe M1 and output power pipe M2 is in setting times
Number, it may be assumed that
Wherein, IBATFor the output electric current of the constant-current and constant-voltage control circuit 1, IM2To flow through the output power pipe M2's
Electric current, K are the real number greater than 1, IM1For the electric current for flowing through the current sample pipe M1, VPROGFor the current sample feedback signal
Voltage value, RSFor the resistance value of the sampling resistor.In the present embodiment, 1000 K, V after constant voltage outputPROGFor 1V or 0.2V.
It is defeated after being controlled by constant current constant voltage since the voltage of three poles of the current sample pipe M1 and the output power pipe M2 is consistent
Meet following relational expression out:
Wherein, VBATFor output voltage, VFBFor the voltage value of the voltage sample feedback signal FB,For the output electricity
Press the ratio of sampling resistor in sampling module.In the present embodiment, V after constant voltage outputFBFor 1.2V.
It further include that the constant-current and constant-voltage control circuit 1 3) is turned off when completely filling as a kind of implementation of the present embodiment.
Specifically, based on the current sample feedback signal PROG judgement flow through the efferent duct rate pipe M2 electric current whether
Drop to set point, judge that signal STANDBY works if then completely filling, turn off the power supply of the efferent duct rate pipe M2 to lead to
Road stops charging；Conversely, keeping charged state.
Embodiment two
As shown in figure 4, the present embodiment provides a kind of linear charging systems 01, the linear charging systems 01 include:
The constant-current and constant-voltage control circuit 1 of embodiment one, power supply input circuit 2 and battery modules 3.
As shown in figure 4, the constant-current and constant-voltage control circuit 1 is for realizing constant current, Isobarically Control, and then obtain stable defeated
Out.In the present embodiment, the constant-current and constant-voltage control circuit 1 forms chip, in order to improve the constant-current and constant-voltage control circuit 1
Flexibility, the sampling resistor Rs are set to chip exterior, can pass through the sampling resistor Rs realization pair of the different resistance values of selection
Export the setting of electric current.The specific structure of the constant-current and constant-voltage control circuit 1 and connection relationship refering to embodiment one explanation,
This is not repeated one by one.
As shown in figure 4, the power supply input circuit 2 connects the constant-current and constant-voltage control circuit 1, it is the constant current constant voltage control
Circuit processed provides input power VIN.
Specifically, in the present embodiment, the power supply input circuit 2 includes voltage source S3 and the first filter capacitor C1, institute
One end ground connection of voltage source S3 is stated, one end exports the input power VIN；The first filter capacitor C1 is parallel to the voltage
The both ends of source S3 are filtered the input power VIN.In actual use, the voltage source S3 can be replaced rectification mould
AC power source is converted to the input power VIN by rectification module, is not limited to this embodiment by block.
As shown in figure 4, the battery modules 3 are connected to the drain electrode of the output power pipe M2, for receiving the constant current
The electrical energy for storage that constant-voltage control circuit 1 exports.
Specifically, in the present embodiment, the battery modules 3 include cell load 31 and the second filter capacitor C2, described
The anode of cell load 31 connects the output end of the constant-current and constant-voltage control circuit 1, cathode ground connection；The second filter capacitor C2
The both ends of the cell load 31 are parallel to, are filtered for the output voltage to the constant-current and constant-voltage control circuit 1.
As a kind of implementation of the present embodiment, the linear charging systems 01 further include charging indication 4, described
The control terminal of charging indication 4 connects described completely fill and judges signal STANDBY, when the linear charging systems 01 stop charging
When charge closing indicator light.
Specifically, in the present embodiment, the charging indication 4 includes the 3rd resistor R3 being sequentially connected in series, charging refers to
Show lamp D3 and switching tube N3, in the present embodiment, the charging indicator light D3 uses LED light, and the switching tube N3 is brilliant using N-type
Body pipe, in actual use, any device that instruction can be achieved, the device that switch can be achieved are suitable for the present invention.When completely filling
When turn off the charging indication 4, the charging indicator light D3 extinguishes.
It should be noted that in the present embodiment, the switching tube N3 is integrated in chip interior in order to improve integrated level.
In conclusion the present invention provides a kind of linear charging systems, constant-current and constant-voltage control circuit and its voltage follow control
Method, including constant-current and constant-voltage control circuit, the electricity for the power supply input circuit of constant-current and constant-voltage control circuit power supply and for energy storage
Chi Mo group；Wherein, constant-current and constant-voltage control circuit includes: current sample pipe, and output power pipe controls current sample pipe and output work
The identical voltage follow control module of the drain voltage of rate pipe is based on voltage sample feedback signal and current sample feedback signal tune
The grid control module of whole current sample pipe and output power tube grid voltage.Linear charging systems of the invention, constant current constant voltage
Control circuit and its voltage follow control method are connected on current sample branch road N-type by Linear Control and adjust tube impedance, nothing
Starting current overshoot solves linear-charging management and there is asking for current over pulse or even constantly restarting of resulting from startup
Topic, and can simplify partial circuit；And output electric current still maintains high-precision current amplification factor when output voltage is lower.
So the present invention effectively overcomes various shortcoming in the prior art and has high industrial utilization value.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause
This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as
At all equivalent modifications or change, should be covered by the claims of the present invention.
Claims (15)
1. a kind of constant-current and constant-voltage control circuit, which is characterized in that the constant-current and constant-voltage control circuit includes at least:
Current sample pipe, output power pipe, voltage follow control module, output voltage sampling module and grid control module；
The source electrode of the current sample pipe connects input power, and grid connects the output end of the grid control module, drain electrode warp
The first end of sampling resistor, the second end ground connection of the sampling resistor, the electric current are connected after the voltage follow control module
Sampling pipe is for generating sample rate current；
The source electrode of the output power pipe connects the input power, and grid connects the output end of the grid control module, leaks
Pole connects the output voltage sampling module, for adjusting output electric current；
The voltage follow control module is connected to the drain electrode of the current sample pipe and the output power pipe, for controlling
The drain voltage for stating current sample pipe follows the drain voltage of the output power pipe, wherein the voltage follow control module
Including operational amplifier and N-type adjustment pipe；The input terminal of the operational amplifier is separately connected the current sample pipe and described
The drain electrode of output power pipe；The drain electrode of the N-type adjustment pipe connects the drain electrode of the current sample pipe, and source electrode connects the sampling
The first end of resistance, grid connect the output end of the operational amplifier；
The grid control module connects the first end of the output voltage sampling module and the sampling resistor, by the output
The voltage sample feedback signal of voltage sample module output is compared with the first calibration voltage, by the electricity on the sampling resistor
Stream sampled feedback signal is compared with the second calibration voltage, and adjusts the current sample pipe and institute based on two comparison results
The grid voltage of output power pipe is stated, and then controls output voltage values.
2. constant-current and constant-voltage control circuit according to claim 1, it is characterised in that: the constant-current and constant-voltage control circuit also wraps
Constant current calibration point selection module is included, the constant current calibration point selection module connects the drain electrode of the output power pipe, will be described defeated
The drain voltage of power tube is compared with the first benchmark out, and output constant current calibration point selection signal is with determination first school
The value of quasi- voltage.
3. constant-current and constant-voltage control circuit according to claim 2, it is characterised in that: the constant-current and constant-voltage control circuit also wraps
It includes and completely fills determination module, the first end completely filled determination module and connect the sampling resistor, by the current sample feedback letter
It number is compared with the second benchmark, and output phase should expire and fill judgement signal.
4. constant-current and constant-voltage control circuit according to claim 3, it is characterised in that: the determination module that completely fills includes comparing
Unit and NAND Logic unit；The input terminal of the comparing unit is separately connected the current sample feedback signal and described second
Benchmark；The input terminal of the NAND Logic unit is separately connected the comparing unit and the defeated of point selection module is calibrated in the constant current
Outlet, when the drain voltage of the output power pipe be greater than first benchmark and the current sample feedback signal be less than it is described
Described completely fill judges that signal works when the second benchmark.
5. constant-current and constant-voltage control circuit according to claim 4, it is characterised in that: the constant-current and constant-voltage control circuit also wraps
Include and completely fill shutdown module, it is described completely fill shutdown block coupled in series in the output power pipe power supply into ground access, it is described completely to fill
The control terminal connection of shutdown module is described completely to fill judgement signal.
6. constant-current and constant-voltage control circuit according to claim 1, it is characterised in that: the constant-current and constant-voltage control circuit also wraps
Substrate selecting module is included, the substrate selecting module includes first diode and the second diode；The sun of the first diode
Pole connects the input power, and cathode connects the substrate of the current sample pipe and the output power pipe；Two or two pole
The cathode of pipe connects the cathode of the first diode, and anode connects the drain electrode of the output power pipe.
7. constant-current and constant-voltage control circuit according to claim 1, it is characterised in that: the constant-current and constant-voltage control circuit also wraps
Reference voltage generation module is included, the reference voltage generation module receives the input power, and produces based on the input power
Reference voltage and calibration voltage in the raw constant-current and constant-voltage control circuit.
8. constant-current and constant-voltage control circuit according to claim 1, it is characterised in that: the constant-current and constant-voltage control circuit also wraps
Include pull-up current source, the one end in the pull-up current source connects the input power, and the other end connects the of the sampling resistor
One end.
9. constant-current and constant-voltage control circuit according to claim 1, it is characterised in that: the constant-current and constant-voltage control circuit also wraps
Pull-down current source is included, the one end in the pull-down current source connects the output end of the grid control module, other end ground connection.
10. a kind of linear charging systems, which is characterized in that the linear charging systems include at least:
Constant-current and constant-voltage control circuit as claimed in any one of claims 1 to 9 wherein, power supply input circuit and battery modules；
The power supply input circuit connects the constant-current and constant-voltage control circuit, provides input electricity for the constant-current and constant-voltage control circuit
Source；
The battery modules are connected to the drain electrode of the output power pipe, for receiving the constant-current and constant-voltage control circuit output
Electrical energy for storage.
11. linear charging systems according to claim 10, it is characterised in that: the linear charging systems further include charging
Indicating circuit, the control terminal connection of the charging indication is described completely to fill judgement signal, when the linear charging systems stop
The charging indication is turned off when charging.
12. a kind of voltage follow controlling party based on constant-current and constant-voltage control circuit as claimed in any one of claims 1 to 9 wherein
Method, which is characterized in that the voltage follow control method of the constant-current and constant-voltage control circuit includes at least:
Compare the drain voltage of current sample pipe Yu output power pipe, and based on the current sample pipe and the output power pipe
Drain voltage difference Serial regulation and the current sample pipe concatenated N-type adjustment pipe impedance, make the current sample pipe
Drain voltage follows the drain voltage of the output power pipe.
13. the voltage follow control method of constant-current and constant-voltage control circuit according to claim 12, it is characterised in that: work as institute
When stating the drain voltage of output power pipe and being higher than the drain voltage of the current sample pipe, increase the impedance of N-type adjustment pipe,
So that the drain voltage of the current sample pipe increases；Conversely, the drain voltage when the output power pipe is lower than the electric current
When the drain voltage of sampling pipe, reduce the impedance of the N-type adjustment pipe, so that the drain voltage of the current sample pipe reduces；
Until the current sample pipe is equal with the drain voltage of the output power pipe.
14. the voltage follow control method of constant-current and constant-voltage control circuit according to claim 12, it is characterised in that: described
The output electric current of constant-current and constant-voltage control circuit meets following relational expression:
Wherein, IBATFor the output electric current of the constant-current and constant-voltage control circuit, IM2For the electric current for flowing through the output power pipe, K is
Real number greater than 1, IM1For the electric current for flowing through the current sample pipe, VPROGFor the voltage value of the current sample feedback signal,
RSFor the resistance value of the sampling resistor.
15. the voltage follow control method of constant-current and constant-voltage control circuit according to claim 12, it is characterised in that: described
The output voltage of constant-current and constant-voltage control circuit meets following relational expression:
Wherein, VBATFor the output voltage of the constant-current and constant-voltage control circuit, VFBFor the voltage of the voltage sample feedback signal
Value,For the ratio of sampling resistor in the output voltage sampling module.
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| CN201910123334.0A CN109861329A (en) | 2019-02-18 | 2019-02-18 | Linear charging systems, constant-current and constant-voltage control circuit and its voltage follow control method |
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| CN111463855A (en) * | 2020-04-02 | 2020-07-28 | 无锡艾为集成电路技术有限公司 | Charging control circuit and charging control method, electronic equipment and charging method thereof |
| CN111697648A (en) * | 2020-06-10 | 2020-09-22 | 上海空间电源研究所 | Error amplification circuit with three control loops for lithium ion storage battery and control method thereof |
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