CN203368113U - Battery charging circuit - Google Patents
Battery charging circuit Download PDFInfo
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- CN203368113U CN203368113U CN2013205034363U CN201320503436U CN203368113U CN 203368113 U CN203368113 U CN 203368113U CN 2013205034363 U CN2013205034363 U CN 2013205034363U CN 201320503436 U CN201320503436 U CN 201320503436U CN 203368113 U CN203368113 U CN 203368113U
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Abstract
The utility model relates to a battery charging circuit, which comprises a positive charging end, a negative charging end, a differential amplification module, a comparator, a reference voltage generating module and a power supply IC, wherein the positive charging end and the negative charging end are both connected with a first input end of the comparator through the differential amplification module, a second input end of the comparator is connected with the reference voltage generating module, and the output end of the comparator is connected with a voltage feedback end of the power supply IC. The differential amplification module of the battery charging circuit can avoid error caused by voltage drop of a sampling resistor, thereby enabling feedback voltage to truly reflect the charging voltage. Voltage of the battery is always ensured to reach a limited charge voltage value of the battery and not change along with reduction of charging current of the battery when a constant current process is converted into a voltage constant process and a constant-voltage charging process, thereby being capable of prolonging the time of constant-current charging, and shortening the charging time.
Description
Technical field
The utility model relates to a kind of battery charger.
Background technology
The charging of lithium battery mostly adopts the first constant current charging modes of constant voltage again, constant current and constant voltage process are to control the PWM(Pulse Width Modulation of power supply IC by the feedback control loop of electric current and voltage, pulse width modulation) duty ratio, thereby regulate the energy that transformer transmits, and then the charging current of regulating cell and voltage, make charging process meet first constant current constant voltage again.Speed and the charging current of charging are closely bound up, and the size of electric current is determined according to the requirement of charging.The partial circuit figure that Fig. 1 is battery charger, wherein resistance R 1 is sampling resistor, and it produces voltage VR1, now, the input voltage VB of the in-phase end of integrated transporting discharging OP1 is cell voltage B1 and above-mentioned voltage VR1 sum, it can not reflect real battery voltage value, therefore, in the constant current process, closes to an end while being transformed into the moment of constant voltage process, cell voltage is the restriction charging voltage lower than battery, that is to say that the constant current process finishes in advance, so, will extend the battery charging interval.
The utility model content
For the deficiencies in the prior art, the purpose of this utility model is intended to provide a kind of battery charger that accelerates the battery charging.
For achieving the above object, the utility model adopts following technical scheme:
A kind of battery charger, it comprises ,Fu charging end, positive charging end, differential amplification module, comparator, reference voltage generation module and power supply IC; He Fu charging end, positive charging end all connects the first input end of comparator by the differential amplification module, the second input of comparator connects the reference voltage generation module, and the output of comparator connects the pressure feedback port of power supply IC.
This differential amplification module comprises the first integrated transporting discharging and the first resistance to the seven resistance, this positive charging end is successively by the first resistance, the second resistance, the 4th resistance is connected negative charging end with the 6th resistance, node ground connection between the second resistance and the 4th resistance, the in-phase end of this first integrated transporting discharging connects the node between the first resistance and the second resistance by the 5th resistance, the end of oppisite phase of this first integrated transporting discharging connects the node between the 4th resistance and the 6th resistance by the 5th resistance, the output of this first integrated transporting discharging connects the first input end of comparator by the 7th resistance.
This comparator is the second integrated transporting discharging, and the reference voltage generation module comprises the 8th resistance, the 9th resistance and DC power supply, and battery charger also comprises the first diode and the tenth resistance; The end of oppisite phase of the second integrated transporting discharging, by the 9th grounding through resistance, also connects DC power supply by the 8th resistance, and the output of the second integrated transporting discharging connects the anode of the first diode by the tenth resistance, and the negative electrode of this first diode connects the pressure feedback port of power supply IC.
Battery charger also comprises rectifier, transformer, field effect transistor, the second diode, electric capacity, the 11 resistance and sampling resistor; AC power is connected the anode of the second diode successively with transformer by rectifier, the negative electrode of the second diode, by capacity earth, also connects positive charging end, an end ground connection of sampling resistor, and the other end of sampling resistor connects negative charging end; The signal end of this power supply IC, by the 11 grounding through resistance, also connects the drain electrode of field effect transistor, the control end connection transformer of this power supply IC.
The beneficial effects of the utility model are as follows:
The error that the differential amplification module of above-mentioned utility model can avoid the pressure drop of sampling resistor to cause, make feedback voltage can reflect truly charging voltage.When the constant current process is transformed into constant voltage process and in the constant voltage charge process, all the time guarantee that the voltage of battery reaches the charging deboost value of battery, and can be with not the reducing and change of the charging current of battery, so, can extend the time of constant current charge, shorten the charging interval.
The accompanying drawing explanation
The circuit diagram of the battery charger that Fig. 1 is prior art.
The circuit diagram of the better embodiment that Fig. 2 is the utility model battery charger.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the utility model is described further:
Refer to Fig. 2, the utility model relates to a kind of battery charger, and its better embodiment comprises rectifier Z, transformer T, diode D1, diode D2, capacitor C 1, sampling resistor R1, resistance R 2 to R12, integrated transporting discharging OP1, integrated transporting discharging OP2, power supply IC, field effect transistor Q1.
AC power AC is connected the anode of diode D1 by rectifier Z successively with transformer T, the negative electrode of diode D1 is by capacitor C 1 ground connection, also connect positive charging end A, the end ground connection of sampling resistor R1, the other end of sampling resistor R1 connects negative charging end B, positive charging end A, charges to give battery B1 for being connected battery B1 with negative charging end B.This positive charging end A is successively by resistance R 2, resistance R 3, resistance R 5 is connected negative charging end B with resistance R 7, node ground connection between resistance R 3 and resistance R 5, the in-phase end of this integrated transporting discharging OP2 is by the node between resistance R 4 contact resistance R2 and resistance R 3, the end of oppisite phase of this integrated transporting discharging OP2 is by the node between resistance R 6 contact resistance R5 and resistance R 7, the output of this integrated transporting discharging OP2 connects the in-phase end of integrated transporting discharging OP1 by resistance R 8, the end of oppisite phase of integrated transporting discharging OP1 is by resistance R 9 ground connection, also by resistance R 10, connect DC power supply VCC, the output of integrated transporting discharging OP1 connects the anode of diode D2 by resistance R 11, the negative electrode of this diode D2 connects the pressure feedback port FB of power supply IC 20, the signal end S of this power supply IC 20 is by resistance R 12 ground connection, also connect the drain electrode of field effect transistor Q1, the control end PWM connection transformer T of this power supply IC 20.
Above-mentioned integrated transporting discharging OP2, resistance R 2 form a differential amplification module 10 to resistance R 7, and above-mentioned integrated transporting discharging OP1 is equivalent to comparator, and resistance R 10, resistance R 9 and DC power supply VCC form the reference voltage generation module.
The electromotive force of positive charging end A, the voltage of negative charging end B electromotive force and sampling resistor R1 is exported the in-phase end of feedback voltage to this integrated transporting discharging OP1 after processing by differential amplification module 10, this feedback voltage has reflected real charging voltage value in real time, and be not subject to the impact of the voltage of sampling resistor R1, therefore, no matter be when the constant current process finishes, or after being transformed into constant voltage process, the restriction charging voltage of the charging voltage of battery and battery is identical, can be along with not the carrying out of constant voltage charge, electric current reduces gradually and changes, really accomplished constant voltage charge, so, just can shorten the time of charging, the process that adds charging quickly.
For a person skilled in the art, can make other various corresponding changes and distortion according to technical scheme described above and design, and these all changes and the distortion all should belong to the protection range of the utility model claim within.
Claims (4)
1. a battery charger, it is characterized in that: it comprises ,Fu charging end, positive charging end, differential amplification module, comparator, reference voltage generation module and power supply IC; He Fu charging end, positive charging end all connects the first input end of comparator by the differential amplification module, the second input of comparator connects the reference voltage generation module, and the output of comparator connects the pressure feedback port of power supply IC.
2. battery charger as claimed in claim 1, it is characterized in that: this differential amplification module comprises the first integrated transporting discharging and the first resistance to the seven resistance, this positive charging end is successively by the first resistance, the second resistance, the 4th resistance is connected negative charging end with the 6th resistance, node ground connection between the second resistance and the 4th resistance, the in-phase end of this first integrated transporting discharging connects the node between the first resistance and the second resistance by the 5th resistance, the end of oppisite phase of this first integrated transporting discharging connects the node between the 4th resistance and the 6th resistance by the 5th resistance, the output of this first integrated transporting discharging connects the first input end of comparator by the 7th resistance.
3. battery charger as claimed in claim 2, it is characterized in that: this comparator is the second integrated transporting discharging, and the reference voltage generation module comprises the 8th resistance, the 9th resistance and DC power supply, and battery charger also comprises the first diode and the tenth resistance; The end of oppisite phase of the second integrated transporting discharging, by the 9th grounding through resistance, also connects DC power supply by the 8th resistance, and the output of the second integrated transporting discharging connects the anode of the first diode by the tenth resistance, and the negative electrode of this first diode connects the pressure feedback port of power supply IC.
4. battery charger as claimed in claim 3, it is characterized in that: battery charger also comprises rectifier, transformer, field effect transistor, the second diode, electric capacity, the 11 resistance and sampling resistor; AC power is connected the anode of the second diode successively with transformer by rectifier, the negative electrode of the second diode, by capacity earth, also connects positive charging end, an end ground connection of sampling resistor, and the other end of sampling resistor connects negative charging end; The signal end of this power supply IC, by the 11 grounding through resistance, also connects the drain electrode of field effect transistor, the control end connection transformer of this power supply IC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013205034363U CN203368113U (en) | 2013-08-16 | 2013-08-16 | Battery charging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013205034363U CN203368113U (en) | 2013-08-16 | 2013-08-16 | Battery charging circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203368113U true CN203368113U (en) | 2013-12-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013205034363U Expired - Fee Related CN203368113U (en) | 2013-08-16 | 2013-08-16 | Battery charging circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN203368113U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103884960A (en) * | 2013-12-31 | 2014-06-25 | 镇江海贝信息科技有限公司 | High voltage traveling wave detection PT |
| CN106712196A (en) * | 2017-01-21 | 2017-05-24 | 合肥惠科金扬科技有限公司 | Charging protection circuit and charger |
| TWI692173B (en) * | 2018-04-09 | 2020-04-21 | 茂達電子股份有限公司 | Non-narrow voltage direct current (non-nvdc) charger and control method thereof |
| CN112865228A (en) * | 2021-01-11 | 2021-05-28 | 惠州Tcl移动通信有限公司 | Battery protection circuit and mobile terminal |
-
2013
- 2013-08-16 CN CN2013205034363U patent/CN203368113U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103884960A (en) * | 2013-12-31 | 2014-06-25 | 镇江海贝信息科技有限公司 | High voltage traveling wave detection PT |
| CN103884960B (en) * | 2013-12-31 | 2016-06-22 | 镇江海贝信息科技有限公司 | High pressure traveling wave detector PT |
| CN106712196A (en) * | 2017-01-21 | 2017-05-24 | 合肥惠科金扬科技有限公司 | Charging protection circuit and charger |
| CN106712196B (en) * | 2017-01-21 | 2023-05-16 | 合肥惠科金扬科技有限公司 | Charging protection circuit and charger |
| TWI692173B (en) * | 2018-04-09 | 2020-04-21 | 茂達電子股份有限公司 | Non-narrow voltage direct current (non-nvdc) charger and control method thereof |
| CN112865228A (en) * | 2021-01-11 | 2021-05-28 | 惠州Tcl移动通信有限公司 | Battery protection circuit and mobile terminal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160823 Address after: 425000 Industrial Road, Hexi Industrial Zone, Lingling Industrial Zone, Lingling District, Yongzhou, Hunan Patentee after: Hunan tech-power Technology Co., Ltd. Address before: 518100 Guangdong city of Shenzhen province Baoan District Fuyong street community baishixia Longwangmiao Industrial Zone sixteenth, nineteenth Patentee before: Songshun Electronic (Shenzhen) Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131225 Termination date: 20180816 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |