CN109586363A - A kind of charging circuit - Google Patents
A kind of charging circuit Download PDFInfo
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- CN109586363A CN109586363A CN201811358364.1A CN201811358364A CN109586363A CN 109586363 A CN109586363 A CN 109586363A CN 201811358364 A CN201811358364 A CN 201811358364A CN 109586363 A CN109586363 A CN 109586363A
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- 238000012360 testing method Methods 0.000 claims abstract description 8
- 230000000087 stabilizing effect Effects 0.000 claims description 91
- 230000005611 electricity Effects 0.000 claims description 17
- 238000012545 processing Methods 0.000 claims description 9
- 238000000465 moulding Methods 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
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- 238000013475 authorization Methods 0.000 description 1
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- 238000002493 microarray Methods 0.000 description 1
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Classifications
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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
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/0071—Regulation of charging or discharging current or voltage with a programmable schedule
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- H02J7/0077—
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present embodiments relate to electronic technology fields, disclose a kind of charging circuit.Charging circuit includes base band managing chip, charging control circuit, microcontroller, rechargeable battery, external power supply and printer；The voltage input end of base band managing chip is electrically connected with external power supply, the energization input of base band managing chip is electrically connected with the power supply output end of charging control circuit, the charging output end of base band managing chip is electrically connected with the test side of charging control circuit, and the control terminal of base band managing chip is electrically connected with the first control signal of microcontroller；The energization input of charging control circuit is electrically connected with rechargeable battery, the voltage output end of charging control circuit is electrically connected with the voltage input end of printer, the control terminal of charging control circuit is electrically connected with the control output end of microcontroller, and the second control signal of microcontroller is electrically connected with the control terminal of printer.For guaranteeing printer and base band managing chip while working normally, POS machine automatic shutdown is not made.
Description
Technical field
The present embodiments relate to electronic technology field, in particular to a kind of charging circuit.
Background technique
Point of sale information control system (Point of sales, POS) abbreviation POS machine is a kind of equipped with bar codes technique
Multi-functional terminal end reader, it be mounted on the franchised business of credit card and accepted in site be unified into network with computer, just
It is able to achieve electronic funds to transfer accounts automatically, has the function of to support consumption, pre-authorization, inquiry into balance, account transfer and printing strip etc..At present
Traditional POS machine is developed based on 2G cell phone platform, and the existing implementation of charging system has following three kinds: external charge
Power supply；Increase additional charging management chip；Directly using the charhing unit of original base band managing chip in 2G cell phone platform.
At least there are the following problems in the prior art for inventor's discovery: no matter using external charge power supply, or increase volume
Outer charging management chip can all increase cost, cause unnecessary waste.If directly using original in 2G cell phone platform
The charhing unit of base band managing chip, to realize this charge function, it is necessary to the power supply foot of base band managing chip, with power supply electricity
The anode in pond is connected directly.But the POS machine based on the exploitation of 2G cell phone platform also includes print circuit, the print circuit is in work
The electricity of the supplying cell of POS machine can be largely consumed when making.Therefore, it in the case where the electricity of supplying cell is slightly lower, will lead to
POS machine automatic shutdown and can not normal use.For example, output voltage can be rapid when supplying cell is there are also when 80% electricity
Fall, at this point, the voltage of the supply pin of base band managing chip is lower than the threshold value of hardware shutdown voltage, to cause POS machine
Main control unit is automatically closed, and makes POS machine can not normal use.
Summary of the invention
Embodiment of the present invention is designed to provide a kind of charging circuit, makes it possible to be developed based on 2G cell phone platform
POS machine automatic charging, and printer work normally when, still be able to guarantee POS machine main control unit can normal work
Make, does not influence the use of POS machine.
In order to solve the above technical problems, embodiments of the present invention provide a kind of charging circuit, specifically include: base band pipe
Manage chip, charging control circuit, microcontroller, rechargeable battery, external power supply and printer；Base band managing chip includes that voltage is defeated
Enter end, control terminal, energization input and charging output end, charging control circuit includes power supply output end, voltage output end, control
End, test side and energization input；The voltage input end of base band managing chip is electrically connected with external power supply, base band managing chip
Energization input is electrically connected with the power supply output end of charging control circuit, the charging output end and charge control of base band managing chip
The test side of circuit is electrically connected, and the control terminal of base band managing chip is electrically connected with the first control signal of microcontroller；Charging
The energization input of control circuit is electrically connected with rechargeable battery, and the voltage output end of charging control circuit and the voltage of printer are defeated
Enter end electrical connection, the control terminal of charging control circuit is electrically connected with the control output end of microcontroller, the second control of microcontroller
Input terminal processed is electrically connected with the control terminal of printer；
Base band managing chip judges whether rechargeable battery needs to charge for the voltage according to charging output end, and according to
Judging result generates charging control signal, and charging control signal is switched to charged state for controlling charging control circuit；
Microcontroller is controlled for generating power supplying control signal when detecting that printer is in running order according to charging
Signal processed, control charging control circuit are switched to charged state, or, controlling charging control circuit switching according to power supplying control signal
To power supply state；
Rechargeable battery is printer power supply for the voltage output end by charging control circuit, and passes through charge control
The power supply output end of circuit is the power supply of base band managing chip.
Embodiment of the present invention in terms of existing technologies, provides a kind of charging circuit, by utilizing charging electricity
The voltage of the charging output end of base band managing chip in road, to determine whether needing to charge to rechargeable battery, in power supply state
Under, it is powered by rechargeable battery to base band managing chip and printer；In the charge state, by base band managing chip to charging
Battery charging, avoids leading to POS machine automatic shutdown because printer power consumption is larger, so that not increasing additional charging
In the case where managing chip, it still is able to charge to rechargeable battery, saves cost, avoid unnecessary waste, and protect
Having demonstrate,proved POS machine will not automatic shutdown.
In addition, charging control circuit includes: charging switching control module and power supply Voltage stabilizing module；Charge switching control module
Including first end, control signal input, control signal output and second end, Voltage stabilizing module of powering includes first voltage output
End, second voltage output end, control signal input and voltage input end；Rechargeable battery be connected on charging switching control module and
Between power supply Voltage stabilizing module；The first end of charging switching control module is electrically connected with rechargeable battery, charging switching control module
Control signal input is electrically connected with the control output end of microcontroller, the second end and base band management of the switching control module that charges
The charging output end of chip is electrically connected；The first voltage output end of power supply Voltage stabilizing module and the voltage input end of printer are electrically connected
It connects, the second voltage output end for Voltage stabilizing module of powering is electrically connected with the energization input of base band managing chip, Voltage stabilizing module of powering
Control signal input with charging switching control module control signal output be electrically connected, the voltage for Voltage stabilizing module of powering is defeated
Enter end to be electrically connected with rechargeable battery；
Charge switching control module, for charged state being switched to, micro- when microcontroller inputs charging control signal
When controller inputs power supplying control signal, it is switched to power supply state；Power supply Voltage stabilizing module, inputs for steady pressure treatment rechargeable battery
Voltage, obtain the first pressure stabilizing output voltage, under power supply state, export the first pressure stabilizing output voltage give printer power supply；With
And under power supply state, steady pressure treatment the first pressure stabilizing output voltage obtains the second pressure stabilizing output voltage, output the second pressure stabilizing output
Voltage is powered to base band managing chip.
In which, which is switched to by charged state or power supply state by charging switching control module, is being powered
Under state, power supply Voltage stabilizing module is powered to the energization input of base band managing chip, in the charge state, passes through base band pipe
Chip is managed to charge to rechargeable battery.By the switching of different circuit states, guarantee base band managing chip in the normal work of printer
It can also be worked normally when making, avoid causes the charging output end voltage of base band managing chip fast because the power consumption of printer is big
Speed is fallen, so that the problem of base band managing chip reaches hardware shutdown voltage thresholding and automatic shutdown.
In addition, base band managing chip includes: the charging detecting model being sequentially connected electrically and supply input module；Charging detection
Module judges whether to need to charge to rechargeable battery, however, it is determined that the electricity for the output end that charges for the voltage according to charging output end
It forces down in the first preset threshold, then generates charging control signal, export charging control signal to microcontroller.
In addition, charging switching control module is used for: in the charge state, control base band managing chip is filled to rechargeable battery
Electricity, and under power supply state, control rechargeable battery is powered to printer and base band managing chip.
In addition, power supply Voltage stabilizing module includes the first power supply Voltage stabilizing module being sequentially connected electrically and the second power supply Voltage stabilizing module；
First power supply Voltage stabilizing module obtains the first pressure stabilizing output voltage for the voltage of steady pressure treatment rechargeable battery input, in power supply shape
It under state, exports the first pressure stabilizing output voltage and powers to printer, while exporting the first pressure stabilizing output voltage to the second power supply pressure stabilizing
Module；Second power supply Voltage stabilizing module is obtained for the first pressure stabilizing output voltage of the power supply Voltage stabilizing module input of steady pressure treatment first
Second pressure stabilizing output voltage exports the second pressure stabilizing output voltage and powers to base band managing chip under power supply state.
In which, the voltage inputted by steady pressure treatment guarantees output to the voltage of printer and base band managing chip
The high voltage requirements of printer and the low-voltage demand of base band managing chip can be met respectively.
In addition, the first pressure stabilizing output voltage is higher than the voltage of rechargeable battery input.
In addition, charging switching control module is used for: if it is determined that input power supplying control signal, then according to control signal output
Voltage and the second preset threshold, determine charging switching control module second end voltage.
In which, pass through power supplying control signal, it is determined whether need to control base band managing chip and carry out to rechargeable battery
Charging, avoid because printer power consumption is big make base band managing chip voltage fall sharply automatic shutdown the case where.
In addition, charging detecting model is used for: if it is determined that the voltage of the charging output end of base band managing chip is pre- lower than third
If threshold values, then the shutdown of base band managing chip is controlled.
In addition, base band managing chip further includes independent current source input processing module, independent current source input processing module is used for
External power supply is connected, the voltage that the external power supply provides is converted into electric current, in the charge state, giving the charging electricity
It charges in pond.
Detailed description of the invention
One or more embodiments are illustrated by the picture in corresponding attached drawing, these exemplary theorys
The bright restriction not constituted to embodiment, the element in attached drawing with same reference numbers label are expressed as similar element, remove
Non- to have special statement, composition does not limit the figure in attached drawing.
Fig. 1 is the charging circuit configuration block diagram in first embodiment according to the present invention；
Fig. 2 is the charging control circuit structural block diagram in first embodiment according to the present invention；
Fig. 3 is the structural block diagram of the power supply Voltage stabilizing module in first embodiment according to the present invention；
Fig. 4 is the structural block diagram of the base band managing chip in second embodiment according to the present invention；
Fig. 5 is the practical circuit diagram of the charging circuit in third embodiment according to the present invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with attached drawing to the present invention
Each embodiment be explained in detail.However, it will be understood by those skilled in the art that in each embodiment party of the present invention
In formula, in order to make the reader understand this application better, many technical details are proposed.But even if without these technical details
And various changes and modifications based on the following respective embodiments, the application technical solution claimed also may be implemented.
The first embodiment of the present invention is related to a kind of charging circuits, for the POS machine to be developed based on 2G cell phone platform
Automatic charging, and when guaranteeing that printer works normally, POS machine not automatic shutdown.Below to the charging circuit in present embodiment
Realization details be specifically described, the following contents only understands the realization details of this programme for convenience, not implements this programme
It is necessary.
Fig. 1 show the structure chart of the charging circuit in present embodiment, specifically includes: base band managing chip 101, charging
Control circuit 102, microcontroller 106, rechargeable battery 103, external power supply 105 and printer 104；
Base band managing chip 101 includes voltage input end, control terminal, energization input and charging output end, charge control
Circuit 102 includes power supply output end, voltage output end, control terminal, test side and energization input；Base band managing chip 101
Voltage input end is electrically connected with external power supply 105, energization input and the charging control circuit 102 of base band managing chip 101
Output end of powering is electrically connected, and the charging output end of base band managing chip 101 is electrically connected with the test side of charging control circuit 102,
The control terminal of base band managing chip 101 is electrically connected with the first control signal of microcontroller 106；Charging control circuit 102
Energization input is electrically connected with rechargeable battery 103, and the voltage of the voltage output end and printer 104 of charging control circuit 102 is defeated
Enter end electrical connection, the control terminal of charging control circuit 102 is electrically connected with the control output end of microcontroller 106, microcontroller 106
The second control signal be electrically connected with the control terminal of printer 104.
Base band managing chip 101 judges whether rechargeable battery 103 needs to charge for the voltage according to charging output end,
And charging control signal is generated according to judging result, charging control signal is switched to charging for controlling charging control circuit 102
State.
Microcontroller 106 is for generating power supplying control signal when detecting that printer 104 is in running order, according to filling
Electric control signal, control charging control circuit 102 is switched to charged state, or, controlling charge control according to power supplying control signal
Circuit 102 switches to power supply state.
Rechargeable battery 103 is used to through the voltage output end of charging control circuit 102 be the power supply of printer 104, and passes through
The power supply output end of charging control circuit 102 is the power supply of base band managing chip 101.
It should be noted that external power supply 105 passes through base band managing chip 101 when rechargeable battery 103 needs to charge
Charging output end to charging control circuit 102, exports voltage output again by charging control circuit 102 to rechargeable battery 103
It charges.Wherein, the voltage of the voltage input end of base band managing chip 101 is the voltage that external power supply 105 inputs.
At one in the specific implementation, the specific structure of charging control circuit 102 is as shown in Figure 2, wherein charging control circuit
102 include: charging switching control module 202 and power supply Voltage stabilizing module 201；The switching control module 202 that charges includes first end, control
Signal input part, control signal output and second end processed, power supply Voltage stabilizing module 201 include first voltage output end, the second electricity
Press output end, control signal input and voltage input end；Rechargeable battery 103 is connected on charging switching control module 202 and supplies
Between electric Voltage stabilizing module 201；The first end of charging switching control module 202 is electrically connected with rechargeable battery 103, switching control of charging
The control signal input of module 202 is electrically connected with the control output end of microcontroller 106, charging switching control module 202
Second end is electrically connected with the charging output end of base band managing chip 101；Power Voltage stabilizing module 201 first voltage output end and beat
The voltage input end of print machine 104 is electrically connected, second voltage output end and the base band managing chip 101 of Voltage stabilizing module 201 of powering
The control of energization input electrical connection, the control signal input and charging switching control module 202 of Voltage stabilizing module 201 of powering is believed
The voltage input end of the electrical connection of number output end, power supply Voltage stabilizing module 201 is electrically connected with rechargeable battery 103；
The switching control module 202 that charges is used to be switched to charging shape when microcontroller 106 inputs charging control signal
State is switched to power supply state when microcontroller 106 inputs power supplying control signal；
Voltage stabilizing module 201 of powering is used for the voltage that steady pressure treatment rechargeable battery 103 inputs, and obtains the first pressure stabilizing output electricity
Pressure exports the first pressure stabilizing output voltage and powers to printer 104 under power supply state；And under power supply state, steady pressure treatment
First pressure stabilizing output voltage obtains the second pressure stabilizing output voltage, exports the second pressure stabilizing output voltage and supplies to base band managing chip 101
Electricity.
It should be noted that power supply Voltage stabilizing module 201 can be any other electronics member device that voltage stabilizing function may be implemented
Part is realized, it is not limited to specific implementation in the present embodiment.Charging control circuit 102 in the embodiment is not intended to limit
The specific manifestation form of power supply Voltage stabilizing module 201 and the switching control module 202 that charges may include two above module and come specifically
It realizes the function of the charging control circuit 102, the charging control only can also be implemented by charging switching control module 202
The function of circuit 102 processed can also be that other are able to detect that any electronic component whether rechargeable battery 103 needs to charge comes
Realize the function of the charging control circuit 102.
Wherein, the specific structure is shown in FIG. 3 for power supply Voltage stabilizing module 201, comprising: the first power supply pressure stabilizing being sequentially connected electrically
Module 301 and the second power supply Voltage stabilizing module 302；What the first power supply Voltage stabilizing module 301 was inputted for steady pressure treatment rechargeable battery 103
Voltage obtains the first pressure stabilizing output voltage, under power supply state, exports the first pressure stabilizing output voltage and powers to printer 104, together
When export the first pressure stabilizing output voltage to second power supply Voltage stabilizing module；Second power supply Voltage stabilizing module 302 is used for steady pressure treatment first
The first pressure stabilizing output voltage that Voltage stabilizing module 301 of powering inputs, obtains the second pressure stabilizing output voltage, under power supply state, output
Second pressure stabilizing output voltage is powered to base band managing chip 101.
Wherein, the first pressure stabilizing output voltage is higher than the voltage that rechargeable battery 103 inputs.
It should be noted that the first pressure stabilizing output voltage is higher than the voltage that rechargeable battery 103 inputs.It is implemented at one
In, the first power supply Voltage stabilizing module 301 can realize that the switch DC booster circuit is realized using switch DC booster circuit
The voltage that rechargeable battery inputs is raised, for powering to printer 104.Second power supply Voltage stabilizing module 302 can use low pressure
Difference linear constant voltage regulator realizes that the low pressure difference linear voltage regulator realizes the conversion of different direct current source value, and ensure that
The voltage value that base band managing chip 101 inputs is to prevent from influencing base band pipe because of the fluctuation of input voltage by steady pressure treatment
Manage the performance of chip 101.
Wherein, charging switching control module 202 is used for: in the charge state, control base band managing chip 101 gives charging electricity
Pond 103 is charged, and under power supply state, and control rechargeable battery 103 is powered to printer 104 and base band managing chip 101.
Wherein, charging switching control module 202 is used for: if it is determined that input is power supplying control signal, then being believed according to control
The voltage and the second preset threshold of number output end determine the voltage of the second end of charging switching control module 202.
At one in the specific implementation, pressure between the positive electrode and negative electrode that the second preset threshold can be set as a diode
The pressure drop of depreciation, diode is needed at 0.3 volt or less.If it is determined that input is power supplying control signal, then charge switching control mould
The voltage of the second end of block 202, the voltage equal to the control signal output of charging switching control module 202 subtract 0.3 volt.This
When charging switching control module 202 second end voltage, different from input charging control signal when calculation method, in order to
Guarantee that base band managing chip 101 can still work normally without shutting down when printer 104 works.
In the embodiment, under power supply state, rechargeable battery 103 passes through the voltage output end of charging control circuit 102
It is powered for printer 104, and is that base band managing chip 101 is supplied by the energization input of charging control circuit 102
Electricity.In the charge state, charging control circuit 102 controls base band managing chip according to the charging control signal that microcontroller inputs
101 charge for rechargeable battery 103.Enable the POS machine automatic charging based on the exploitation of 2G cell phone platform, and is printing
When machine works normally, it still is able to guarantee that the base band managing chip of POS machine can work normally, does not influence the use of POS machine.
Second embodiment of the present invention is related to a kind of charging circuit, and the second embodiment and first embodiment are substantially
Identical, be in place of the main distinction: base band managing chip 101 includes charging detecting model 502, supply input module 501 and solely
Vertical power input processing module 503.
Wherein, the specific structure of base band managing chip 101 is as shown in Figure 4, comprising: the charging detecting model being sequentially connected electrically
502 and supply input module 501；Charging detecting model 502 is used for the voltage according to charging output end, judges whether to need to filling
Battery 103 charges, however, it is determined that the voltage for the output end that charges is lower than the first preset threshold, then generates charging control signal, exports
Charging control signal is to microcontroller 106.
At one in the specific implementation, the base band managing chip 101 can be using the base band core developed based on 2G cell phone platform
Piece, wherein supply input module 501 can be a power supply pipe of the baseband chip based on the exploitation of 2G cell phone platform
Foot, charging detecting model 502 can be a detection pin of the baseband chip based on the exploitation of 2G cell phone platform, and the inspection
Test tube foot is also charging output end simultaneously, in the charge state, charging to rechargeable battery 103.
Wherein, charging detecting model 502 is used for: if it is determined that the voltage of the charging output end of base band managing chip 101 is lower than
Third preset threshold then controls the shutdown of base band managing chip 101.
At one in the specific implementation, third predetermined threshold value may be defined as hardware shutdown voltage threshold value, for example, in practical reality
Now, the hardware shutdown voltage threshold value can be set as 3.2 volts.If the detection for the baseband chip that should be developed based on 2G cell phone platform
The voltage of pin is lower than hardware shutdown voltage threshold value, then should be based on the baseband chip that 2G cell phone platform is developed with regard to automatic shutdown.
At one in the specific implementation, base band managing chip 101 further includes independent current source input processing module 503, independent electrical
The voltage that external power supply 105 provides is converted into electric current, is used for by source input processing module 503 for connecting external power supply 105
Under charged state, charge to rechargeable battery 103.
It should be noted that the external power supply 105 is not limited to specific implementation form, circumscribed USB interface can be used
Power supply is realized, can also be realized using any other electronic device that can provide power supply, is just not listed one by one herein.
Third embodiment of the present invention is related to a kind of charging circuit, which is based on first or second embodiment party
The physical circuit of formula realizes that physical circuit figure is as shown in Figure 5:
2G platform baseband chip in the circuit indicates the base band managing chip 101 in first embodiment, in the circuit
Rechargeable battery indicate the rechargeable battery 103 in first embodiment, the printer in the circuit indicates in first embodiment
Printer 104, low pressure difference linear voltage regulator (low dropout regulator, LDO), switch DC liter in the circuit
Charging control circuit 102 in volt circuit (Boost), switch S1 and diode D1 composition first embodiment.Wherein, the circuit
In LDO and Boost composition first embodiment in power supply Voltage stabilizing module 201, the switch DC booster circuit in the circuit
(Boost) indicate that the first power supply Voltage stabilizing module 301 in first embodiment, the LDO in the circuit indicate first embodiment
In the second power supply Voltage stabilizing module 302, filling in the switch S1 and diode D1 composition expression first embodiment in the circuit
Cutting changes control module 202.The power supply pin (V-Battery, VBAT) of 2G platform baseband chip in the circuit indicates
Supply input module 501 in second embodiment, detection pin (BATSNS) table of the 2G platform baseband chip in the circuit
Show the charging detecting model 502 in second embodiment, the external power supply input pin of the 2G platform baseband chip in the circuit
(VCHG) the independent current source input processing module 503 in second embodiment is indicated, the USB interface charging in the circuit indicates the
External power supply 105 in two embodiments.
It should be noted that the VBAT pin in 2G platform baseband chip is the power supply pipe of the 2G platform baseband chip
Foot.BATSNS pin in 2G platform baseband chip is the detection pin of the 2G platform baseband chip, this BATSNS pin can be with
For detecting the voltage of rechargeable battery, the voltage that can also be used to when charging as the 2G platform baseband chip to rechargeable battery is defeated
Pin out, while being also used to detect whether the 2G platform baseband chip needs automatic shutdown, if the 2G platform baseband chip
BATSNS pin voltage is lower than hardware shutdown voltage threshold value, then the 2G platform baseband chip shuts down immediately；Wherein, hardware shuts down
Voltage threshold indicates the third predetermined threshold value in second embodiment.VCHG pin in 2G platform baseband chip is the 2G flat
The external power supply input terminal of stylobate microarray strip, for being charged by USB interface power supply to rechargeable battery；Wherein, external power supply
Electric current is exported by the detection pin of the 2G platform baseband chip to rechargeable battery.The circuit diagram is not drawn into microcontroller, but real
Border includes microcontroller when realizing, which is used to handle the power supplying control signal and 2G platform base band core of printer input
The charging control signal of piece input, and the power supplying control signal or the charging control signal are exported to switch S1, for controlling out
Close being opened or closed for S1.
In the circuit diagram, according to judging whether to need to be charged with 2G platform baseband chip to rechargeable battery, by this
The overall work state demarcation of circuit is following three states: general standby mode, charged state and print state.
Under general standby mode, POS machine is normally opened, microcontroller control switch S1 is in closed state at this time, if
This switch S1 realizes that then metal-oxide-semiconductor is in the conductive state at this time using metal-oxide-semiconductor, is now in normal Standby working condition.Because of switch
S1 is in closed state, and the voltage value of the node 2 marked in the charging circuit is equal to the voltage value of node 1, i.e. rechargeable battery
Cathode voltage value.
When the voltage value of the BATSNS pin of 2G platform baseband chip is lower than the voltage value of node 3, the i.e. output voltage of LDO
When value, 2G platform baseband chip needs to be alerted to microcontroller.For example, setting the output voltage values of LDO in actual use
It is 3.5 volts, if the voltage value of the BATSNS pin of 2G platform baseband chip is lower than 3.5 volts, which needs
It is alerted to microcontroller, or closes LDO output, otherwise diode D1 will be connected, and rechargeable battery is caused to be discharged completely.
The charging circuit is in charged state at this time.
In the charge state, microcontroller control switch S1 is in closed state, and 2G platform baseband chip is managed by VCHG
Foot obtains the voltage of circumscribed USB power supply, and the voltage which provides external power supply is converted into electric current, passes through
Electric current after the conversion is exported and is charged to rechargeable battery by BATSNS pin.
If user is collected money using POS machine, printer is needed to print voucher item.The circuit is in print state at this time.
Under print state, microcontroller control switch S1 is in an off state, and does not need detection rechargeable battery at this time
Cathode voltage, but need to detect the voltage value of the VBAT pin of 2G platform baseband chip.Because of BATSNS pin and VBAT pin
Between there are diode D1, and switch S1 is in an off state, therefore also can detecte the voltage value of BATSNS pin, and then is obtained
The voltage value of the VBAT pin.It ensure that the voltage value of BATSNS pin not less than hardware shutdown electricity by the conducting of diode D1
Pressure gate limit value, by the conducting of D1 diode, is protected for example, setting the hardware shutdown voltage threshold value in actual use as 3.2 volts
The voltage value for demonstrate,proving BATSNS pin is greater than 3.2 volts, ensure that baseband chip not automatic shutdown.
It should be noted that rechargeable battery is done the voltage of rechargeable battery at boosting by Boost under the print state
After reason, power to printer, meanwhile, rechargeable battery also passes through Boost and the voltage of rechargeable battery is done boosting processing, using
After LDO steady pressure treatment, it is powered to 2G platform baseband chip.
It will be understood by those skilled in the art that the respective embodiments described above are to realize specific embodiments of the present invention,
And in practical applications, can to it, various changes can be made in the form and details, without departing from the spirit and scope of the present invention.
Claims (9)
1. a kind of charging circuit characterized by comprising base band managing chip, charging control circuit, microcontroller, charging electricity
Pond, external power supply and printer；
The base band managing chip includes voltage input end, control terminal, energization input and charging output end, the charge control
Circuit includes power supply output end, voltage output end, control terminal, test side and energization input；
The voltage input end of the base band managing chip is electrically connected with the external power supply, and the power supply of the base band managing chip is defeated
Enter end to be electrically connected with the power supply output end of the charging control circuit, the charging output end of the base band managing chip is filled with described
The test side of electric control circuit is electrically connected, and the control terminal of the base band managing chip and the first control of the microcontroller input
End electrical connection；
The energization input of the charging control circuit is electrically connected with the rechargeable battery, and the voltage of the charging control circuit is defeated
Outlet is electrically connected with the voltage input end of the printer, the control of the control terminal of the charging control circuit and the microcontroller
Output end electrical connection processed, the second control signal of the microcontroller are electrically connected with the control terminal of the printer；
The base band managing chip judges whether the rechargeable battery needs to fill for the voltage according to the charging output end
Electricity, and charging control signal is generated according to judging result, the charging control signal is cut for controlling the charging control circuit
Change to charged state；
The microcontroller, for generating power supplying control signal when detecting that the printer is in running order, according to institute
Charging control signal is stated, the charging control circuit is controlled and is switched to charged state, or, being controlled according to the power supplying control signal
The charging control circuit switches to power supply state；
The rechargeable battery is printer power supply for the voltage output end by the charging control circuit, and passes through
The power supply output end of the charging control circuit is base band managing chip power supply.
2. charging circuit according to claim 1, which is characterized in that the charging control circuit includes: charging switching control
Molding block and power supply Voltage stabilizing module；
The charging switching control module includes first end, control signal input, control signal output and second end, described
Voltage stabilizing module of powering includes first voltage output end, second voltage output end, control signal input and voltage input end；
The rechargeable battery is connected between the charging switching control module and the power supply Voltage stabilizing module；
The first end of the charging switching control module is electrically connected with the rechargeable battery, the control of the charging switching control module
Signal input part processed is electrically connected with the control output end of the microcontroller, the second end of the charging switching control module and institute
State the charging output end electrical connection of base band managing chip；
The first voltage output end of the power supply Voltage stabilizing module is electrically connected with the voltage input end of the printer, and the power supply is steady
The second voltage output end of die block is electrically connected with the energization input of the base band managing chip, the power supply Voltage stabilizing module
Control signal input is electrically connected with the control signal output of the charging switching control module, the power supply Voltage stabilizing module
Voltage input end is electrically connected with the rechargeable battery；
The charging switching control module, for being switched to described when the microcontroller inputs the charging control signal
Charged state is switched to the power supply state when the microcontroller inputs the power supplying control signal；
The power supply Voltage stabilizing module obtains the first pressure stabilizing output voltage for the voltage of the input of rechargeable battery described in steady pressure treatment,
Under the power supply state, exports the first pressure stabilizing output voltage and power to the printer；And in the power supply state
Under, the first pressure stabilizing output voltage described in steady pressure treatment obtains the second pressure stabilizing output voltage, exports the second pressure stabilizing output voltage
It powers to the base band managing chip.
3. charging circuit according to claim 1, which is characterized in that the base band managing chip includes: to be sequentially connected electrically
Charging detecting model and supply input module；
The charging detecting model judges whether to need to the rechargeable battery for the voltage according to the charging output end
Charging, however, it is determined that the voltage of the charging output end is lower than the first preset threshold, then generates the charging control signal, export institute
Charging control signal is stated to the microcontroller.
4. charging circuit according to claim 2, which is characterized in that the charging switching control module is used for:
Under the charged state, controls the base band managing chip and charge to the rechargeable battery, and in the power supply shape
Under state, controls the rechargeable battery and power to the printer and the base band managing chip.
5. charging circuit according to claim 2, which is characterized in that the power supply Voltage stabilizing module includes being sequentially connected electrically
First power supply Voltage stabilizing module and the second power supply Voltage stabilizing module；
The first power supply Voltage stabilizing module obtains the first pressure stabilizing output for the voltage of the input of rechargeable battery described in steady pressure treatment
Voltage exports the first pressure stabilizing output voltage and gives printer power supply, while exporting described the under the power supply state
One pressure stabilizing output voltage is to the second power supply Voltage stabilizing module；
The second power supply Voltage stabilizing module, the first pressure stabilizing for the first power supply Voltage stabilizing module input described in steady pressure treatment export electricity
Pressure, obtains the second pressure stabilizing output voltage, under the power supply state, exports the second pressure stabilizing output voltage to the base band pipe
Manage chip power supply.
6. charging circuit according to claim 5, which is characterized in that the first pressure stabilizing output voltage is higher than the charging
The voltage of battery input.
7. charging circuit according to claim 2, which is characterized in that the charging switching control module is used for:
If it is determined that input the power supplying control signal, then according to the voltage of the control signal output and the second preset threshold,
Determine the voltage of the second end of the charging switching control module.
8. charging circuit according to claim 3, which is characterized in that the charging detecting model is used for:
If it is determined that the voltage of the charging output end of the base band managing chip is lower than third preset threshold, then the base band pipe is controlled
Manage chip shutdown.
9. charging circuit according to claim 3, which is characterized in that the base band managing chip further include: independent current source
Input processing module,
The voltage that the external power supply provides is converted by the independent current source input processing module for connecting external power supply
Electric current, in the charge state, charging to the rechargeable battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811358364.1A CN109586363B (en) | 2018-11-15 | 2018-11-15 | Charging circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811358364.1A CN109586363B (en) | 2018-11-15 | 2018-11-15 | Charging circuit |
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| CN109586363B CN109586363B (en) | 2022-06-07 |
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| CN109586363B (en) | 2022-06-07 |
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