CN100550571C

CN100550571C - Battery charging method

Info

Publication number: CN100550571C
Application number: CNB200610115452XA
Authority: CN
Inventors: 徐登贤; 郁宗龙; 蔡文坪
Original assignee: Aeneas Energy Tech Co Ltd
Current assignee: Aeneas Energy Tech Co Ltd
Priority date: 2006-08-10
Filing date: 2006-08-10
Publication date: 2009-10-14
Anticipated expiration: 2026-08-10
Also published as: CN101123362A

Abstract

The invention provides a method for charging batteries, which is matched with a microcontroller and a series voltage-dividing resistor to control the size of a charging power supply, so that each battery can achieve the optimal charging effect. The invention uses the microcontroller to detect the total terminal voltage of the battery pack by virtue of the series-connection voltage-dividing resistor, and after each battery in the battery pack completes the first round of charging, the microcontroller commands the power supply to reduce the output charging current, and then carries out the second round of charging on the batteries in the battery pack, and the above steps are circulated for a preset number of times. Thereby, each of the series-connected batteries to be charged can be charged to an optimum state.

Description

A kind of method of battery charge

Technical field

The invention relates to a kind of method of battery charge, refer to a kind ofly when power supply unit charges to a multi-section serial battery especially, cooperate microcontroller and series connection divider resistance, make each battery can both reach the method for optimal charge effect.

Background technology

Along with digital camera, PDA, MP3 ... wait the demand of portable type electronic product to increase day by day, also bigger for the requirement of chargeable battery capacity, also shorter for the requirement in charging interval, in addition, also require more frivolous for the volume of charger.Therefore, a kind of volume is little again can quick charge and long charger of cheap life-span, seemingly developing tendency in future.

Present existing battery charger uses the CC/CV mode to charge mostly.Wherein, CC is meant with constant current battery charge; CV is meant with constant voltage battery charge.And the CC/CV mode is charged and is the method that adopts constant current and constant voltage to combine, to a kind of charging modes of battery or battery pack.

Also there is small part to adopt so-called pulse current charge mode now, promptly use constant current to battery charge, and the charging voltage state of inspection battery-end, increase or reduce a pulse wave width modulation signal according to this charging voltage state again, the output valve of adjusting the charging interval with control at any time reaches the charging average current that can dynamically adjust this battery to battery.

Yet, many with the CC/CV mode required test point that charges, and require detector to have high precision, cause cost significantly to improve.And pulse mode is charged when the later stage enters the pulse mode charging, and is very high to battery cell protection I C requirement, and circuit constitutes comparatively complicated, quite not convenient.

Therefore, how inventing out a kind of method of battery charge, so that charging circuit is simplified, reduce cost, and improve the precision of battery charge, will be that the present invention desires actively to inquire into part.

Summary of the invention

The inventor is because the shortcoming of aforementioned prior art, be manufacturing experience and the technology accumulation of being engaged in various chargers according to it, method at the various solutions of the concentrated research of above-mentioned disappearance, after through constantly research, experiment and improvement, finally development and Design goes out the method for a kind of battery charge of the present invention, in the hope of the disappearance that prior art produced of forgoing.

Main purpose of the present invention is that a kind of method of battery charge is being provided, and it is by using microcontroller and series connection divider resistance, and then reaches and significantly simplify circuit, reduces cost, and improves the purpose of battery charge precision.

According to above-mentioned purpose, the method for a kind of battery charge of the present invention comprises:

(1) a plurality of batteries is composed in series a battery pack, and this battery pack is connected with a power supply unit;

(2) one first divider resistance is connected with one second divider resistance form a series connection divider resistance, and make this series connection divider resistance in parallel with this battery pack;

(3) microcontroller is connected with this power supply unit, and this microcontroller is in parallel with this second divider resistance;

(4) make this microcontroller send one first and control signal to this power supply unit, make this power supply unit provide a constant charge current to this battery pack;

(5) when arbitrary battery of these batteries in this battery pack is charged to one first predeterminated voltage value, this battery pack is cut off a charge circuit that should battery;

(6) make this microcontroller detect total terminal voltage value of this battery pack by this series connection divider resistance, when this magnitude of voltage less than one second predeterminated voltage value or when receiving from the output signal of this battery pack full for filling (FULL), make this microcontroller export extremely respectively this charge circuit of a reset signal, making respectively, this charge circuit recloses; And

(7) whether the output number of times of judging this reset signal has reached a default value, in this way, make this microcontroller cut off the power supply of this power supply unit, stop charging, as denying, make this microcontroller export one second and control signal to this power supply unit, make this power supply unit reduce this constant charge current, and get back to step (4).

Whereby, charging circuit is simplified, reduced cost, and improve the precision of battery charge.

Description of drawings

Fig. 1 is a preferred embodiment schematic diagram of the method according to this invention.

Fig. 2 is a method flow schematic diagram of the present invention.

Symbol description:

1, battery pack

2, power supply unit

3, start/shutdown circuit

4, microcontroller

5, reset signal

R1, first divider resistance

R2, second divider resistance

P+, P-, magnitude of voltage

Embodiment

For making purpose of the present invention, method feature and effect thereof, do further understanding and understand, cooperate graphicly now for embodiment, be described in detail as follows:

Fig. 1 is a preferred embodiment schematic diagram of the method according to this invention, as shown in the figure, at first a plurality of batteries are composed in series a battery pack 1, and (for example: a stepped charge-variable device or a linear variable charger with this battery pack 1 and a power supply unit 2, but be not limited thereto) series connection, wherein, each battery can be a high capacity capacitor or a lithium battery.In addition, one first divider resistance R1 connects with one second divider resistance R2 and forms a series connection divider resistance, and makes this series connection divider resistance in parallel with battery pack 1.One microcontroller 4 that then will comprise analog/digital converter (figure does not show) is connected with power supply unit 2, and the microcontroller 4 that will contain analog/digital converter (figure does not show) is in parallel with this second divider resistance R2, and microcontroller 4 can be learnt total terminal voltage value of battery pack 1 by the second divider resistance R2.Microcontroller 4 (for example: a logical value sends one first control signal then, but be not limited thereto) to power supply unit 2, make power supply unit 2 that a constant charge current is provided, charge power supply does not flow into this battery, changes by the bypass in parallel with this battery to flow into next battery.Microcontroller 4 is by a magnitude of voltage P+, the P-of series connection divider resistance detecting battery pack 1, as magnitude of voltage P+, P-during less than one second predeterminated voltage value or when to receive Full output signal from this battery pack 1 be effective, (for example: a logical value make microcontroller 4 outputs one reset signal 5, but be not limited thereto) to each charge circuit (figure does not show), each charge circuit (figure does not show) is reclosed.Whether the output number of times of judging reset signal 5 has then reached a default value, in this way, make microcontroller 4 see through the cut off the electricity supply power supply of supply 2 of start/shutdown circuit 3, stop charging,, (for example: a logical value make microcontroller 4 outputs one second control signal as not, but be not limited thereto) to power supply unit 2, make power supply unit 2 reduce the constant current source output valve, again to the battery charge in the battery pack 1, so cycle charging makes battery be charged to optimum state.

Fig. 2 is a method flow schematic diagram of the present invention, cooperates shown in Figure 1ly, and wherein this method may further comprise the steps:

(1) a plurality of batteries are composed in series a battery pack 1, and with this battery pack 1 and a power supply unit 2 (for example: a stepped charge-variable device or a linear variable charger, but be not limited thereto) series connection;

(2) one first divider resistance R1 is connected with one second divider resistance R2 form a series connection divider resistance, and make this series connection divider resistance in parallel with battery pack 1;

(3) microcontroller 4 that will contain digital/analog converter (figure do not show) is connected with power supply unit 2, and microcontroller 4 is in parallel with this second divider resistance R2, and microcontroller 4 can be learnt total terminal voltage value of this battery pack by the second divider resistance R2;

(4) making microcontroller 4 send one first control signal (for example: a logical value, but be not limited thereto) to power supply unit 2, makes power supply unit 2 that a constant charge current is provided;

(5) when arbitrary battery of these batteries in the battery pack is charged to one first predeterminated voltage value, battery pack is cut off a charge circuit (figure does not show) of corresponding this battery, total terminal voltage value will reduce the voltage of a batteries this moment, charge power supply does not flow into this battery, changes by the bypass in parallel with this battery to flow into next battery;

(6) make total terminal voltage value P+, the P-of microcontroller 4 by series connection divider resistance detecting battery pack 1, when magnitude of voltage P+, P-less than one second predeterminated voltage value or when receiving from the output signal of this battery pack 1 full for filling (FULL), (for example: a logical value make microcontroller 4 outputs one reset signal 5, but be not limited thereto) to each charge circuit (figure does not show), each charge circuit (figure does not show) is reclosed; And

(7) whether the output number of times of judging reset signal 5 has reached a default value, in this way, make microcontroller 4 see through the cut off the electricity supply power supply of supply 2 of start/shutdown circuit 3, stop charging, as not, make microcontroller 4 outputs one second control signal (for example: a logical value, but be not limited thereto) to power supply unit 1, make power supply unit 1 reduce constant charge current, and get back to step (4).

The above only be the best specific embodiment of the present invention, but structural feature of the present invention is not limited thereto, and anyly is familiar with this skill person in field of the present invention, can think easily and variation or modification, all can be encompassed in the claim of this case.

Claims

1. A method for charging a battery, the method comprising:

(1) Connect multiple batteries in series to form a battery pack, and connect the battery pack to a power supply in series;

(2) A first voltage dividing resistor and a second voltage dividing resistor are connected in series to form a series voltage dividing resistor, and the series voltage dividing resistor is connected in parallel with the battery pack;

(3) Connect the output pin of a microcontroller to the control pin of the power supply, and connect the microcontroller to the second voltage dividing resistor in parallel;

(4) Make the microcontroller send a first control signal to the power supply, so that the power supply provides a constant charging current to the battery pack;

(5) When any of the batteries in the battery pack is charged to a first preset voltage value, the battery pack cuts off a charging circuit corresponding to the battery;

(6) Make the microcontroller detect a voltage value of the battery pack through the series voltage dividing resistor, when the voltage value is less than a second preset voltage value or receive an output signal from the battery pack as fully charged , so that the microcontroller outputs a reset signal to each of the charging circuits, so that each of the charging circuits is connected; and

(7) Determine whether the output times of the reset signal have reached a default value, if so, make the microcontroller cut off the power supply of the power supply, stop charging, if not, make the microcontroller output a second control signal to The power supply makes the power supply reduce the constant charging current, and returns to step (4).

2. The method of claim 1, wherein each of the batteries is a capacitor or a lithium battery.

3. The method as claimed in claim 1, wherein the power supply is a step-type variable output current source charger or a linear variable output current source charger.

4. The method of claim 1, wherein the reset signal is a logic value.

5. The method of claim 1, wherein the first control signal is a logic value.

6. The method of claim 1, wherein the second control signal is a logic value.

7. The method of claim 1, wherein the microcontroller comprises an analog/digital converter.

8. The method as claimed in claim 1, wherein the constant charging current is provided by a constant current power supply with a settable current.