CN104578305A - USB intelligent charging circuit and charging device - Google Patents
USB intelligent charging circuit and charging device Download PDFInfo
- Publication number
- CN104578305A CN104578305A CN201510031721.3A CN201510031721A CN104578305A CN 104578305 A CN104578305 A CN 104578305A CN 201510031721 A CN201510031721 A CN 201510031721A CN 104578305 A CN104578305 A CN 104578305A
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- charging
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- resistance
- switching tube
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
- H02J7/0049—Detection of fully charged condition
Abstract
The invention applies to the electronic field and provides a USB intelligent charging circuit and a charging device. The charging circuit comprises a USB interface unit, a charging unit and a power supply switch unit, wherein the USB interface unit is used for being connected with external direct current supply input, the charging unit is used for charging for a battery when the power supply input is available, the input end of the charging unit is connected with the USB interface unit and the output end of the charging unit, together with a temperature detection device, is connected with the battery, the power supply switch unit is used for controlling the external direct current supply input to provide power supply output for a load when the power supply input is available, and controlling the battery to provide power supply output for the load when the power supply input is not available, the power supply end of the power supply switch unit is connected with the external direct current supply input, the input end of the power supply switch unit is connected with the battery, and the output end of the power supply switch unit is connected with the load. Based on the USB intelligent charging circuit and the charging device, the power supply output is provided by an external source when the battery is being charged, charging current and charging cut-off current are not affected by the power supply load current, and therefore the phenomena that the battery cannot be fully charged as the battery supplies power when starting-up is conducted in the process of charging and a product touches severely hot are avoided, and the safety is improved.
Description
Technical field
The invention belongs to electronic applications, particularly relate to a kind of USB aptitude chargeable circuit and charging device.
Background technology
Along with the develop rapidly of electron trade, increasing electronic product is full of in the life of people, and most electronic product is all by can the battery of recharge, and the especially lithium battery of better performances is electronic product charging as power supply.
But, under many circumstances, need to use electronic product while charging, such as be badly in need of making a phone call in the process of mobile phone charging, or need to use certain application program when panel computer charging, for above-mentioned situation, existing charging circuit is nearly all charging to battery while, be load supplying by battery, so charging current adds that power supply load current is very large, cause charging device and electronic product heating serious, not only reduce product useful life, the serious security incident such as even can set off an explosion, and is unfavorable for product promotion.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of USB aptitude chargeable circuit, is intended to solve existing charging device power supply station while charging and produces serious heating, the problem of poor stability.
The embodiment of the present invention is achieved in that a kind of USB aptitude chargeable circuit, is connected with battery, and described circuit comprises:
Usb interface unit, to power input for connecting external dc;
Charhing unit, for being the charging of described battery when there being power supply input, the input of described charhing unit is connected with described usb interface unit, and the output of described charhing unit is all connected with described battery with temperature detection end;
Power switch unit, for when there being power supply input, control described external dc power input to load provide power supply export, when not powering input, controlling battery provides power supply to export to load, power end and the external dc of described power switch unit are powered to input and are connected, and the input of described power switch unit is connected with described battery, and the output of described power switch unit is connected with load.
Another object of the embodiment of the present invention is, provides a kind of charging device adopting above-mentioned USB aptitude chargeable circuit.
The embodiment of the present invention is while charging to battery, being input as load by externally fed provides power supply to export, be that the charging repeatedly that causes of load supplying and battery cannot be full of electricity when avoiding battery charging, and charging current and charge cutoff electric current be not by the impact of power supply load current, when avoiding charging, start uses the product caused to generate heat serious phenomenon, improve the safety and reliability of charging circuit, extend the useful life of product, this charging circuit is simple and easy, cost is low.
Accompanying drawing explanation
The structure chart of the USB aptitude chargeable circuit that Fig. 1 provides for the embodiment of the present invention;
The exemplary circuit structure chart of the USB aptitude chargeable circuit that Fig. 2 provides for the embodiment of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.In addition, if below in described each execution mode of the present invention involved technical characteristic do not form conflict each other and just can mutually combine.
The embodiment of the present invention is while charging to battery, being input as load by externally fed provides power supply to export, be that the charging repeatedly that causes of load supplying and battery cannot be full of electricity when avoiding battery charging, and charging current and charge cutoff electric current be not by the impact of power supply load current, when avoiding charging, start uses the product caused to generate heat serious phenomenon, improves the fail safe of charging circuit.
Below in conjunction with specific embodiment, realization of the present invention is described in detail:
Fig. 1 shows the structure of the USB aptitude chargeable circuit that the embodiment of the present invention provides, and for convenience of explanation, illustrate only part related to the present invention.
As one embodiment of the invention, this USB aptitude chargeable circuit can be applied in the charging device of any electronic equipment, and this USB aptitude chargeable circuit is connected with battery 2, comprising:
Usb interface unit J1, to power input for connecting external dc;
Charhing unit 11, for being that battery 2 charges when there being power supply input, the input of charhing unit 11 is connected with usb interface unit J1, and the output of charhing unit 11 is all connected with battery 2 with temperature detection end;
Power switch unit 12, for when there being power supply input, control external dc powers to input provides power supply to export to load, when not powering input, controlling battery 2 provides power supply to export to load, power end and the external dc of power switch unit 12 are powered to input and are connected, and the input of power switch unit 12 is connected with battery 2, and the output of power switch unit 12 is connected with load.
In embodiments of the present invention, usb interface unit J1 and external USB+5V power to input and are connected, power to charhing unit 11, charge to after charhing unit 11 powers on battery 2, simultaneously, power switch unit 12 turns off the path that battery exports supply power voltage, and input of being powered by external dc powers to the load as power supply output after carrying out voltage stabilizing.
The embodiment of the present invention is while charging to battery, being input as load by externally fed provides power supply to export, be that the charging repeatedly that causes of load supplying and battery cannot be full of electricity when avoiding battery charging, and charging current and charge cutoff electric current be not by the impact of power supply load current, when avoiding charging, start uses the product caused to generate heat serious phenomenon, improve the safety and reliability of charging circuit, extend the useful life of product, this charging circuit is simple and easy, cost is low.
Fig. 2 shows the exemplary circuit structure of the USB aptitude chargeable circuit that the embodiment of the present invention provides, and for convenience of explanation, illustrate only part related to the present invention.
As one embodiment of the invention, this charhing unit 11 comprises:
Resistance R2, resistance R3, resistance R4, electric capacity C1 and charging module U1;
One end of electric capacity C1 is that the input of charhing unit 11 is connected with the power end (VDD) of charging module U1, the other end ground connection of electric capacity C1, the charging current of charging module U1 arranges end (ISET) by resistance R4 ground connection, the current-termination setting of charging module U1 holds (PRTRM) by resistance R2 ground connection, the charged state end of charging module U1
for the display end of charhing unit 11, the battery-end (VBAT) of charging module U1 and temperature detection end (TS) are respectively output and the temperature detection end of charhing unit 11, the temperature detection end (TS) of charging module U1 also passes through resistance R3 ground connection, the earth terminal (VSS) of charging module U1, heating pad end (PAD_VSS), the second current settings end (ISET2) all ground connection.
As one embodiment of the present invention, charging module U1 can adopt BQ24092DGQR type charging management chip.
As one embodiment of the invention, this power switch unit 12 comprises:
Resistance R1, voltage-stabiliser tube D1, the first switching tube Q1, second switch pipe Q2 and the 3rd switching tube Q3;
The output of second switch pipe Q2 is the input of power switch unit 12, the input of second switch pipe Q2 is connected with the input of the 3rd switching tube Q3, the control end of second switch pipe Q2 and the control end of the 3rd switching tube Q3 are simultaneously for the power end of power switch unit 12 is connected with the input of the first switching tube Q1, the output of the 3rd switching tube Q3 is that the output of power switch unit 12 is connected with the output of the first switching tube Q1, the control end of the 3rd switching tube Q3 is connected with one end of resistance R1 and the negative electrode of voltage-stabiliser tube D1 simultaneously, the other end of resistance R1 is connected with the input of the first switching tube Q1, the plus earth of voltage-stabiliser tube D1.
As one embodiment of the present invention, first switching tube Q1 can adopt collector current to be greater than the NPN type triode of load current, the input of the current collection of NPN type triode very the first switching tube Q1, the output of the transmitting of NPN type triode very the first switching tube Q1, the base stage of NPN type triode is the control end of the first switching tube Q1;
Second switch pipe Q2 and the 3rd switching tube Q3 all can adopt the P-channel enhancement type field effect transistor of big current, low conducting internal resistance, the source electrode of P-channel enhancement type field effect transistor is the input of second switch pipe Q2 or the 3rd switching tube Q3, the drain electrode of P-channel enhancement type field effect transistor is the output of second switch pipe Q2 or the 3rd switching tube Q3, and the grid of P-channel enhancement type field effect transistor is the control end of second switch pipe Q2 or the 3rd switching tube Q3.
In embodiments of the present invention, USB+5V input is powered to input as external dc and is powered to charging module U1 by usb interface unit J1, charging module U1 is charged to lithium battery 2 by battery-end (VBAT), simultaneously, USB+5V input voltage is connected to the grid of second switch pipe Q2 and the 3rd switching tube Q3, second switch pipe Q2 and the 3rd switching tube Q3 is ended, and therefore lithium battery electric current can not provide power supply to export for load;
USB+5V input voltage at 3.9V-4.2V, is load supplying by voltage-stabiliser tube D1 and the first switching tube Q1 voltage stabilizing;
When after the short electricity of USB+5V input voltage, the gate-source voltage of second switch pipe Q2 and the 3rd switching tube Q3 is negative, second switch pipe Q2 and the 3rd switching tube Q3 conducting, now, is switched to lithium battery 2 and exports for load provides to power.
In embodiments of the present invention, charging current can be regulated by the resistance of regulating resistance R4.
As one embodiment of the invention, this USB aptitude chargeable circuit also comprises:
Charging indicating member 13, is full of electricity just in charging or for being in by display reminding subscriber line circuit, and the power end of charging indicating member 13 is connected with usb interface unit J1, and the control end of charging indicating member 13 is connected with the display end of charhing unit 11.
As one embodiment of the present invention, charging indicating member 13 comprises:
Resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, charging indicator light LED1, be full of electric indicator light LED2 and the 4th switching tube Q4;
One end of resistance R5 is that the power end of charging indicating member 13 is connected with the anode of charging indicator light LED1, the negative electrode of charging indicator light LED1 is connected with one end of resistance R6, the other end of resistance R6 is that the control end of charging indicating member 13 is connected with the other end of resistance R5, be full of the anode of electric indicator light LED2 simultaneously for the power end of charging indicating member 13 is connected with the anode of charging indicator light LED1, the negative electrode being full of electric indicator light LED2 is connected with one end of resistance R7, the other end of resistance R7 is connected with the input of the 4th switching tube Q4, the control end of the 4th switching tube Q4 is connected with one end of resistance R9, the other end of resistance R9 is the control end of charging indicating member 13 simultaneously, the control end of the 4th switching tube Q4 is also connected with one end of resistance R8, the other end of resistance R8 and the output of the 4th switching tube Q4 ground connection simultaneously.
In embodiments of the present invention, charging module U1 is by charged state end end
charge information is exported to charging indicating member 13, charging indicating member 13 according to charge information by charging indicator light LED1 and be full of the instruction that electric indicator light LED2 carries out corresponding charged state.
Wherein, resistance R5, resistance R6 and charging indicator light LED1 can form charging indicating member, resistance R7, resistance R8, resistance R9, are full of electric indicator light LED2 and the 4th switching tube Q4 and constitute and be full of electric indicating member.
As one embodiment of the invention, red LED can being adopted as charging indicator light LED1, adopting green LED as being full of electric indicator light LED2.
In the process that battery 2 charges, charging module U1 exports a low level signal by display end, and now, the 4th switching tube Q4 ends, and charging indicator light LED1 (red light) is bright, represents that battery charges;
After battery 2 is full of electricity, charging module U1 exports a high level signal by display end, now, 4th switching tube Q4 conducting, is full of electric indicator light LED2 (green light) bright, represents that battery is full of electricity, charging indicator light LED1 two ends are high level, and charging indicator light LED1 does not work.
As one embodiment of the invention, this USB aptitude chargeable circuit also comprises:
First magnetic bead FB1 and the second magnetic bead FB2;
First magnetic bead FB1 is connected between one end of usb interface unit J1 and the input of charhing unit 11, and one end of the second magnetic bead FB2 is connected with the other end of usb interface unit J1, the other end ground connection of the second magnetic bead FB2.
In embodiments of the present invention, electromagnetic interference (ElectromagneticInterference, EMI) can be suppressed by magnetic bead.
As one embodiment of the invention, this USB aptitude chargeable circuit also comprises:
Ripple Suppression unit 14, for suppressing battery ripple, the input of Ripple Suppression unit 14 is all connected with the input of power switch unit 12 with output.
As one embodiment of the present invention, Ripple Suppression unit 14 comprises:
Electric capacity C2 and electric capacity C3;
One end of electric capacity C2 is connected with one end of electric capacity C3, not only as the input of Ripple Suppression unit 14 but also the output as Ripple Suppression unit 14, and the other end ground connection simultaneously of electric capacity C2 and electric capacity C3.
Another object of the embodiment of the present invention is, provides a kind of charging device adopting above-mentioned USB aptitude chargeable circuit.
The embodiment of the present invention is while charging to battery, being input as load by externally fed provides power supply to export, be that the charging repeatedly that causes of load supplying and battery cannot be full of electricity when avoiding battery charging, and charging current and charge cutoff electric current be not by the impact of power supply load current, when avoiding charging, start uses the product caused to generate heat serious phenomenon, improve the safety and reliability of charging circuit, extend the useful life of product, this charging circuit is simple and easy, cost is low.
These are only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a USB aptitude chargeable circuit, is connected with battery, it is characterized in that, described circuit comprises:
Usb interface unit, to power input for connecting external dc;
Charhing unit, for being the charging of described battery when there being power supply input, the input of described charhing unit is connected with described usb interface unit, and the output of described charhing unit is all connected with described battery with temperature detection end;
Power switch unit, for when there being power supply input, control described external dc power input to load provide power supply export, when not powering input, controlling battery provides power supply to export to load, power end and the external dc of described power switch unit are powered to input and are connected, and the input of described power switch unit is connected with described battery, and the output of described power switch unit is connected with load.
2. circuit as claimed in claim 1, it is characterized in that, described charhing unit comprises:
Resistance R2, resistance R3, resistance R4, electric capacity C1 and charging module;
One end of described electric capacity C1 is that the input of described charhing unit is connected with the power end (VDD) of described charging module, the other end ground connection of described electric capacity C1, the charging current of described charging module arranges end (ISET) by described resistance R4 ground connection, the current-termination setting of described charging module holds (PRTRM) by described resistance R2 ground connection, the charged state end of described charging module
for the display end of described charhing unit, the battery-end (VBAT) of described charging module and temperature detection end (TS) are respectively output and the temperature detection end of described charhing unit, the temperature detection end (TS) of described charging module also passes through described resistance R3 ground connection, the earth terminal (VSS) of described charging module, heating pad end (PAD_VSS), the second current settings end (ISET2) all ground connection.
3. circuit as claimed in claim 2, it is characterized in that, described charging module is charging management chip.
4. circuit as claimed in claim 1, it is characterized in that, described power switch unit comprises:
Resistance R1, voltage-stabiliser tube D1, the first switching tube, second switch pipe and the 3rd switching tube;
The output of described second switch pipe is the input of described power switch unit, the input of described second switch pipe is connected with the input of described 3rd switching tube, the control end of described second switch pipe and the control end of described 3rd switching tube are simultaneously for the power end of described power switch unit is connected with the input of described first switching tube, the output of described 3rd switching tube is that the output of described power switch unit is connected with the output of described first switching tube, the control end of described 3rd switching tube is connected with one end of described resistance R1 and the negative electrode of described voltage-stabiliser tube D1 simultaneously, the other end of described resistance R1 is connected with the input of described first switching tube, the plus earth of described voltage-stabiliser tube D1.
5. circuit as claimed in claim 4, it is characterized in that, described first switching tube is the NPN type triode that collector current is greater than load current, the input of very described first switching tube of current collection of described NPN type triode, the output of very described first switching tube of transmitting of described NPN type triode, the base stage of described NPN type triode is the control end of described first switching tube;
Described second switch pipe and described 3rd switching tube are P-channel enhancement type field effect transistor, the source electrode of described P-channel enhancement type field effect transistor is the input of described second switch pipe or described 3rd switching tube, the drain electrode of described P-channel enhancement type field effect transistor is the output of described second switch pipe or described 3rd switching tube, and the grid of described P-channel enhancement type field effect transistor is the control end of described second switch pipe or described 3rd switching tube.
6. circuit as claimed in claim 1, it is characterized in that, described circuit also comprises:
Charging indicating member, electricity is full of just in charging or for being in by circuit described in display reminding user, the power end of described charging indicating member is connected with described usb interface unit, and the control end of described charging indicating member is connected with the display end of described charhing unit.
7. circuit as claimed in claim 6, it is characterized in that, described charging indicating member comprises:
Resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, charging indicator light, be full of electric indicator light and the 4th switching tube;
One end of described resistance R5 is that the power end of described charging indicating member is connected with the anode of described charging indicator light, the negative electrode of described charging indicator light is connected with one end of described resistance R6, the other end of described resistance R6 is that the control end of described charging indicating member is connected with the other end of described resistance R5, the described anode being full of electric indicator light is that the power end of described charging indicating member is connected with the anode of described charging indicator light simultaneously, the described negative electrode being full of electric indicator light is connected with one end of described resistance R7, the other end of described resistance R7 is connected with the input of described 4th switching tube, the control end of described 4th switching tube is connected with one end of described resistance R9, the other end of described resistance R9 is the control end of described charging indicating member simultaneously, the control end of described 4th switching tube is also connected with one end of described resistance R8, the other end of described resistance R8 and the output of described 4th switching tube ground connection simultaneously.
8. circuit as claimed in claim 1, it is characterized in that, described circuit also comprises:
First magnetic bead and the second magnetic bead;
Between one end that described first magnetic bead is connected to described usb interface unit and the input of charhing unit, one end of described second magnetic bead is connected with the other end of described usb interface unit, the other end ground connection of described second magnetic bead.
9. circuit as claimed in claim 1, it is characterized in that, described circuit also comprises:
Ripple Suppression unit, for suppressing battery ripple, the input of described Ripple Suppression unit is all connected with the input of described power switch unit with output.
10. a charging device, is characterized in that, described charging device comprises the USB aptitude chargeable circuit as described in any one of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510031721.3A CN104578305B (en) | 2015-01-21 | 2015-01-21 | A kind of USB aptitude chargeable circuits and charging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510031721.3A CN104578305B (en) | 2015-01-21 | 2015-01-21 | A kind of USB aptitude chargeable circuits and charging device |
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| Publication Number | Publication Date |
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| CN104578305A true CN104578305A (en) | 2015-04-29 |
| CN104578305B CN104578305B (en) | 2018-02-23 |
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| CN201510031721.3A Active CN104578305B (en) | 2015-01-21 | 2015-01-21 | A kind of USB aptitude chargeable circuits and charging device |
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Cited By (5)
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| CN104993564A (en) * | 2015-07-10 | 2015-10-21 | 常州东村电子有限公司 | New energy super capacitor charging circuit |
| CN106487069A (en) * | 2016-11-29 | 2017-03-08 | 青岛海信电器股份有限公司 | A kind of charging method based on many USB C interface and main equipment |
| CN109557994A (en) * | 2018-11-29 | 2019-04-02 | 努比亚技术有限公司 | A kind of charge fault monitoring method, equipment and computer can storage mediums |
| CN110365082A (en) * | 2019-07-24 | 2019-10-22 | 昆山龙腾光电有限公司 | Electric power management circuit, electronic equipment and method for managing power supply |
| TWI761824B (en) * | 2020-03-31 | 2022-04-21 | 大陸商廣州昂寶電子有限公司 | USB charging circuit and method, chip and charger |
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| TWI761824B (en) * | 2020-03-31 | 2022-04-21 | 大陸商廣州昂寶電子有限公司 | USB charging circuit and method, chip and charger |
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| Publication number | Publication date |
|---|---|
| CN104578305B (en) | 2018-02-23 |
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