CN101795009B - Battery charging device and method thereof - Google Patents
Battery charging device and method thereof Download PDFInfo
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- CN101795009B CN101795009B CN 200910189881 CN200910189881A CN101795009B CN 101795009 B CN101795009 B CN 101795009B CN 200910189881 CN200910189881 CN 200910189881 CN 200910189881 A CN200910189881 A CN 200910189881A CN 101795009 B CN101795009 B CN 101795009B
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Abstract
The invention provides a battery charging device comprising a charging control unit, a reference voltage generation unit, a switch unit, a current control circuit and a no-load detection circuit, wherein the reference voltage generation unit, the switch unit, the current control circuit and the no-load detection circuit are respectively connected to the charging control unit; the reference voltage generation unit is used for providing reference voltage; and the charging control unit is used for detecting mains voltage according to the reference voltage and matching with the no-load detection circuit to detect external battery voltage as well as matching with the switch unit to charge an external battery. The invention also provides a battery charging method using the battery charging device.
Description
Technical field
The present invention relates to electronic applications, particularly a kind of battery charger of the batteries such as ni-mh, NI-G being realized low-cost and high-performance constant current, pulse, pressure limiting, the charging of prescribing a time limit.
Background technology
Along with the application of electronic product is more and more extensive, battery also is widely applied at increasing product and occasion.At present, to ni-mh, nickel-cadmium cell charging, constant current voltage limiting is very classical charging method.Because the residual memory effect of ni-mh, nickel-cadmium cell is very strong, adopt charge efficiency and the useful life of the more favourable battery of pulse current charge mode.In addition the maximum charge time of ni-mh, nickel-cadmium cell is limited, also quite important to the useful life of battery.
In existing various charging circuits, major part has just realized one or more combination wherein, if any circuit can realize constant current, but do not have pressure limiting or pulse current charge; What have can realize pressure limiting, but does not have the function of constant current or pulse current charge.Although the charging circuit that has can charge in the pulse current charge mode, can't realize constant current or pressure limiting charging.
Summary of the invention
The technical problem that the present invention solves provides a kind of battery charger that can realize constant current, pulse, pressure limiting, the charging of prescribing a time limit.
Another technical problem that the present invention solves provides the method for charging batteries that adopts above-mentioned battery charger.
The technical scheme that the present invention solves the problems of the technologies described above is a kind of battery charger, comprise a charging control unit, one reference voltage generation unit, one this switch element, one current control circuit and a no load detection circuit, this reference voltage generation unit, this this switch element, this current control circuit and a no load detection circuit all are connected to this charging control unit, this reference voltage generation unit is used for providing reference voltage, this charging control unit is used for detecting power supply according to reference voltage, and cooperate this no load detection circuit to detect external battery voltage, and with this switch element cooperation external cell is charged.
In the battery charger of the present invention, this current control circuit comprises one first electric capacity and one first resistance, and this first electric capacity and this first resistance string are associated between this charging control unit and the ground, and this first electric capacity is as the charging current control capacitance.
In the battery charger of the present invention, the reference voltage generation unit is connected between the VDD-to-VSS, for generation of a reference voltage value, this battery charger also comprises an electric source filter circuit, this electric source filter circuit comprises one second electric capacity and one the 3rd electric capacity, and this second electric capacity and the 3rd Capacitance parallel connection are between VDD-to-VSS.
In the battery charger of the present invention, this switch element comprises a charge switch, one capacitor discharge switch, one second resistance and one the 3rd resistance, this charging control unit comprises a power input, one earth terminal, one reference voltage input pin, one reference voltage detects pin, one battery voltage detection pin, one capacitance voltage detects pin, one charging control end and a capacitor discharge control end, the base stage of this charge switch is connected to this charging control end by this second resistance, the base stage of this capacitor discharge switch is connected to this capacitor discharge control end by the 3rd resistance, the negative pole of external cell is connected to the emitter of this charge switch successively by the collector electrode of this charge switch, the emitter of this charge switch passes through the collector and emitter ground connection of this capacitor discharge switch successively, this the first resistance is connected to the emitter of this charge switch, this power input connects power supply, this earth terminal ground connection.
In the battery charger of the present invention, this no load detection circuit comprises one the 4th resistance, and the 4th resistance is connected between power supply and this battery voltage detection pin.
In the battery charger of the present invention, this reference voltage input pin links to each other with positive source, this reference voltage detects pin and links to each other with the output of this reference voltage generator, in order to detection reference voltage, then calculate the voltage that enters this reference voltage input pin, this battery voltage detection pin links to each other with negative electrode of chargeable battery, voltage for detection of external cell, this capacitance voltage detects pin and is connected with the first electric capacity of this current control circuit, for detection of this first electric capacity both end voltage, this charging control end is connected with this charge switch by this second resistance, it is used for conducting and the cut-off of output high-low level signal to control this charge switch, this capacitor discharge control end is connected with this capacitor discharge switch by the 3rd resistance, and it is used for conducting and the cut-off of output high-low level signal to control this capacitor discharge switch.
In the battery charger of the present invention, charging process peripheral battery and this first electric capacity are series relationship, i.e. flow through simultaneously this battery and this first electric capacity of charging current.
In the battery charger of the present invention, control each charging/discharging voltage and cycle, just can accurately control the size of average current.
Method for charging batteries of the present invention comprises test battery voltage, sees whether battery case has battery online, and no words are then removed battery full scale will and the maximum charge time is set; Whether the sign that battery is full of set, otherwise see whether cell voltage has arrived set point; The adjusting charging current is trickle charge or stops and starting the full indicator light of charging; Regulating charging current is that normal charging current also starts just at charging indicator light.
In the method for charging batteries of the present invention, regulate charging current and be trickle charge or stop and starting the full indicator light of charging also comprise seeing whether the maximum charge time arrive, do not reach that then to regulate charging current be that normal charging current and startup are just at charging indicator light.
Compared to prior art, battery charger of the present invention comprises this charging control unit, this reference voltage generation unit, this electric source filter circuit, this switch element, this current control circuit and this no load detection circuit.This reference voltage generation unit is used for providing reference voltage, this charging control unit is used for detecting power supply according to reference voltage, and cooperate this no load detection circuit to detect charged battery voltage, and with this switch element cooperation battery is charged, realize pulse pressure limiting charging.This current control circuit is used for this battery charge of control, realizes constant current charge.In addition, this charging control unit can also be set the maximum charge time, and therefore, this battery charger is realized the function of constant current, pulse, pressure limiting, the charging of prescribing a time limit.
Description of drawings
Fig. 1 is the electrical block diagram of battery charger one preferred embodiments of the present invention.
Fig. 2 is the workflow schematic diagram of another execution mode of battery charger of the present invention.
Embodiment
Seeing also Fig. 1, is the electrical block diagram of battery charger one preferred embodiments of the present invention.This battery charger 1 comprise a charging control unit 10, a reference voltage generation unit 20, an electric source filter circuit 30, a switch element 40, a current control circuit 50,, a no load detection circuit 60, an anodal tie point B+ and a negative pole tie point B-.This positive pole tie point B+ receives from power supply V+ voltage,
This battery charger 1 can receive external power source V+ and be external cell 70 chargings.This reference voltage generation unit 20 is used for providing reference voltage, this charging control unit 10 is used for detecting power supply according to reference voltage, and cooperate this no load detection circuit 60 to detect rechargeable battery 70 voltages, and and this switch element 40 cooperate battery 70 charged, this current control circuit 50 is used for these battery 70 charging currents of control.In addition, this charging control unit 10 can also be set the maximum charge time.
This current control circuit 50 comprises one first capacitor C 1 and one first resistance R 1.This first capacitor C 1 and this first resistance R 1 are connected between this charging control unit 10 and the ground.This first capacitor C 1 is as the charging current control capacitance.
This reference voltage generation unit 20 is connected between power supply V+ and the ground, for generation of a reference voltage value.
This switch element 40 comprises a charge switch TR1, a capacitor discharge switch TR2, one second resistance R 2 and one the 3rd resistance R 3.This no load detection circuit 60 comprises one the 4th resistance R 4.This electric source filter circuit 30 comprises one second capacitor C 2 and one the 3rd capacitor C 3, and this second capacitor C 2 and the 3rd capacitor C 3 are connected in parallel between power supply V and the ground.
This charging control unit 10 comprises that a power input VCC, an earth terminal GND, a reference voltage input pin AD_M_Ref, a reference voltage detect pin B_M_AD, a battery voltage detection pin V_Bat_AD, a capacitance voltage detects pin V_Cap_AD, charging control end Charge and a capacitor discharge control end C_Discharge.
The base stage of this charge switch TR1 is connected to this charging control end Charge by this second resistance R 2, and the base stage of this capacitor discharge switch TR2 is connected to this capacitor discharge control end C_Discharge by the 3rd resistance R 3.The negative pole of this battery 70 is connected to the emitter of this charge switch TR1 by the collector electrode of this negative pole tie point B-, this charge switch TR1 successively.The emitter of this charge switch TR1 passes through the collector and emitter ground connection of this capacitor discharge switch TR2 successively.This first resistance R 1 is connected to the emitter of this charge switch TR1.This power input VCC connects power supply, this earth terminal GND ground connection.The 4th resistance R 4 is connected between power supply and this charging control unit.
This reference voltage input pin AD_M_Ref links to each other with positive source.This reference voltage detects pin B_M_AD and links to each other with the output of this reference voltage generator, in order to detection reference voltage, then calculates the voltage that enters this reference voltage input pin (AD_M_Ref), i.e. positive source voltage.This battery voltage detection pin V_Bat_AD links to each other with negative electrode of chargeable battery, for detection of the voltage of rechargeable battery 70.This capacitance voltage detects pin V_Cap_AD and is connected with the first capacitor C 1 of this current control circuit 50, for detection of this first capacitor C 1 both end voltage.This charging control end Charge is connected with this charge switch TR1 by this resistance R 2, and it is used for output high-low level signal to control conducting and the cut-off of this charge switch TR1.This capacitor discharge control end C_Discharge is connected with this capacitor discharge switch TR2 by this resistance R 3, and it is used for output high-low level signal to control conducting and the cut-off of this capacitor discharge switch TR2.
During this battery charger normal operation:
About charge and discharge process: at first, this first capacitor C, 1 discharge: the charging control end Charge output low level of this charging control unit 10, this capacitor discharge control end C_Discharge exports high level; The negative pole that discharging current passes through positive pole, this first resistance R 1, this capacitor discharge switch TR2 and this first capacitor C 1 of this first capacitor C 1 successively consists of discharge loop.This 1 discharge period of the first capacitor C is designated as " Td ".
Then, this battery 70 and this first capacitor C 1 serial connection charge.The capacitor discharge control end C_Discharge output low level of this charging control unit 10, charging control end Charge output high level.Charging current consists of charge circuit by positive source, these battery 70 positive poles, this charge switch TR1, this first resistance R 1, this first capacitor C 1 ground connection successively.
Can find out that from top charging and discharging circuit this battery 70 is series relationship with this first capacitor C 1 in the charging process, i.e. flow through simultaneously this battery 70 and this first capacitor C 1 of charging current.Duration of charge is designated as " Tc ".
About the constant current control procedure: as mentioned above, the simultaneously charging of connect with this battery 70 during this first capacitor C, 1 charging, this first capacitor C 1 and 70 disconnections of this battery during discharge, this battery 70 does not discharge.
Principle: first capacitor C 1 that changes take capacitance as C discharges and recharges to calculate electric current, is charged to Vc at every turn, then discharges into zero, and the single charge electric weight is like this: Q=C*Vc.If control cycle is T, then average current I=Q/T=C*Vc/T.
According to above-mentioned principle, in charge and discharge process, as long as control each charging/discharging voltage and cycle, just can accurately control the size of average current.
About the battery voltage detection process: the charging control end Charge output low level of this charging control unit 10, capacitor discharge control end C_Discharge output low level.
Start the inside A/D module of this charging control unit 10: this reference voltage that switches in the analog channel detects pin B_M_AD, and the sampling reference voltage starts conversion, keeps AD result, is designated as AD1;
Switch to the battery voltage detection pin V_Bat_AD in the analog channel, sampling battery cathode voltage starts conversion, keeps AD result, is designated as AD2;
Result according to top double sampling, calculate first the positive source voltage to earth: V+=V_BM * AD_Max/AD1 is because battery 70 positive poles link to each other with positive source, according to the AD value AD2 of analog channel V_Bat_AD to the battery cathode sampling, the calculating cell voltage is: V_Bat=V+ * (AD_Max-AD2) wherein, V+ is power supply, V_Bat is cell voltage, V_BM is reference voltage, AD_Max is the maximum occurrences of AD module, AD1 is the transformation result of analog channel B_M_AD in the above-mentioned testing process, and AD2 is the transformation result of analog channel V_Bat_AD in the above-mentioned testing process.
About this first capacitor C 1 both end voltage testing process: the voltage detecting process at two ends and above-mentioned battery 70 voltage detecting processes were basic identical when this first capacitor C 1 discharged and recharged, but switch to corresponding analog channel capacitance voltage and detect pin V_Cap_AD, obtain corresponding transformation result, be designated as AD3, because the electric capacity negative pole links to each other with power cathode, calculate the electric capacity both end voltage: V_Cap=V+*AD3/AD_Max.Limit about maximum time: the application-specific integrated circuit that uses chip microprocessor or possess this function can be designed timer function very easily as this charging control unit 10, and the maximum charge time is Set arbitrarily as required.
In the present embodiment, this charge switch TR1 and this capacitor discharge switch TR2 can be triodes.This charging control unit 10 can be microcontroller.
In the change execution mode of battery charger of the present invention, can also comprise the battery case that a plurality of indicator lights are used to indicate the battery charging and discharging state and are used for placing rechargeable battery.
Please consulting simultaneously Fig. 2, is the workflow schematic diagram of another execution mode of battery charger of the present invention.After the beginning, test battery voltage sees whether battery case has battery online, and no words are then removed battery full scale will and the maximum charge time is set, and prepares charging next time.If words then see the whether set of sign that battery is full of, be that then to regulate charging current be trickle charge or stop and starting the full indicator light of charging; Otherwise seeing whether cell voltage has arrived set point, is set battery full scale will then, otherwise sees whether the maximum charge time arrive, the words that are or set battery full scale will, otherwise to regulate charging current be normal charging current and start just at charging indicator light.
Compared to prior art, battery charger 1 of the present invention comprises this charging control unit 10, this reference voltage generation unit 20, this electric source filter circuit 30, this switch element 40, this current control circuit 50 and this no load detection circuit 60.This reference voltage generation unit 20 is used for providing reference voltage, this charging control unit 10 is used for detecting power supply according to reference voltage, and cooperate this no load detection circuit 60 to detect rechargeable battery 70 voltages, and and this switch element 40 cooperate battery 70 charged, this current control circuit 50 is used for these battery 70 charging currents of control.In addition, this charging control unit 10 can also be set the maximum charge time, and therefore, this battery charger 1 can be realized the function of constant current, pulse, pressure limiting, the charging of prescribing a time limit.
Above content is the further description of the present invention being done in conjunction with concrete preferred implementation, can not assert that implementation of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (1)
1. battery charger, it is characterized in that: comprise a charging control unit, one reference voltage generation unit, one switch element, one current control circuit and a no load detection circuit, this reference voltage generation unit, this switch element, this current control circuit and this no load detection circuit all are connected to this charging control unit, this reference voltage generation unit is used for providing reference voltage, this charging control unit is used for detecting supply voltage according to reference voltage, and cooperate this no load detection circuit to detect external battery voltage, and and this switch element cooperate external cell charged
This current control circuit comprises one first electric capacity and one first resistance, and this first electric capacity and this first resistance string are associated between this charging control unit and the ground, and this first electric capacity is as the charging current control capacitance,
Described switch element comprises a charge switch, one capacitor discharge switch, one second resistance and one the 3rd resistance, this charging control unit comprises a power input, one earth terminal, one reference voltage input pin, one reference voltage detects pin, one battery voltage detection pin, one capacitance voltage detects pin, one charging control end and a capacitor discharge control end, the base stage of this charge switch is connected to this charging control end by this second resistance, the base stage of this capacitor discharge switch is connected to this capacitor discharge control end by the 3rd resistance, the negative pole of external cell is connected to the emitter of this charge switch successively by the collector electrode of this charge switch, the emitter of this charge switch passes through the collector and emitter ground connection of this capacitor discharge switch successively, this the first resistance is connected to the emitter of this charge switch, this power input connects power supply, this earth terminal ground connection
Described reference voltage input pin links to each other with positive source, this reference voltage detects pin and links to each other with the output of this reference voltage generation unit, in order to detection reference voltage, then calculate the voltage that enters this reference voltage input pin, this battery voltage detection pin links to each other with the external cell negative pole, voltage for detection of external cell, this capacitance voltage detects pin and is connected with the first electric capacity of this current control circuit, for detection of this first electric capacity both end voltage, this charging control end is connected with this charge switch by this second resistance, it is used for conducting and the cut-off of output high-low level signal to control this charge switch, this capacitor discharge control end is connected with this capacitor discharge switch by the 3rd resistance, and it is used for conducting and the cut-off of output high-low level signal to control this capacitor discharge switch.
2. battery charger as claimed in claim 1, it is characterized in that: this reference voltage generation unit is connected between the VDD-to-VSS, for generation of this reference voltage, this battery charger also comprises an electric source filter circuit, this electric source filter circuit comprises one second electric capacity and one the 3rd electric capacity, and this second electric capacity and the 3rd Capacitance parallel connection are between VDD-to-VSS.
3. battery charger as claimed in claim 2, it is characterized in that: this no load detection circuit comprises one the 4th resistance, the 4th resistance is connected between power supply and this battery voltage detection pin.
4. battery charger as claimed in claim 1, it is characterized in that: charging process peripheral battery and this first electric capacity are series relationship, i.e. flow through simultaneously this battery and this first electric capacity of charging current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910189881 CN101795009B (en) | 2009-09-04 | 2009-09-04 | Battery charging device and method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910189881 CN101795009B (en) | 2009-09-04 | 2009-09-04 | Battery charging device and method thereof |
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| Publication Number | Publication Date |
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| CN101795009A CN101795009A (en) | 2010-08-04 |
| CN101795009B true CN101795009B (en) | 2013-02-27 |
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| CN 200910189881 Expired - Fee Related CN101795009B (en) | 2009-09-04 | 2009-09-04 | Battery charging device and method thereof |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102005791B (en) * | 2010-11-12 | 2013-12-25 | 深圳和而泰智能控制股份有限公司 | Charging detection method and device for small-capacity battery |
| CN103135062A (en) * | 2011-11-30 | 2013-06-05 | 凯迈(洛阳)电子有限公司 | Charge-discharge monitoring method of high-efficiency power battery |
| CA3110010C (en) * | 2018-10-23 | 2023-07-25 | 2449049 Ontario Inc. | Hybrid power backup storage system |
| CN109638915A (en) * | 2018-12-22 | 2019-04-16 | 北京汉能光伏投资有限公司 | A kind of charge/discharge control method and device |
| CN110221163A (en) * | 2019-03-21 | 2019-09-10 | 珠海智融科技有限公司 | A kind of the connecting detection method and detection circuit of USB Type-C interface |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2168340Y (en) * | 1993-05-11 | 1994-06-08 | 吉林市科达技术开发公司 | Depolarized quick-acting charger |
| CN2824403Y (en) * | 2005-11-03 | 2006-10-04 | 宋嘉鸿 | Temp controlled automatic charger with three colour LED |
| CN101055998A (en) * | 2007-04-23 | 2007-10-17 | 深圳市昊芯微电子有限公司 | Battery charger |
| CN201113509Y (en) * | 2007-09-21 | 2008-09-10 | 深圳市比克电池有限公司 | Batteries charging equipment |
-
2009
- 2009-09-04 CN CN 200910189881 patent/CN101795009B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2168340Y (en) * | 1993-05-11 | 1994-06-08 | 吉林市科达技术开发公司 | Depolarized quick-acting charger |
| CN2824403Y (en) * | 2005-11-03 | 2006-10-04 | 宋嘉鸿 | Temp controlled automatic charger with three colour LED |
| CN101055998A (en) * | 2007-04-23 | 2007-10-17 | 深圳市昊芯微电子有限公司 | Battery charger |
| CN201113509Y (en) * | 2007-09-21 | 2008-09-10 | 深圳市比克电池有限公司 | Batteries charging equipment |
Non-Patent Citations (1)
| Title |
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| JP特开2006-325372A 2006.11.30 |
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| CN101795009A (en) | 2010-08-04 |
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