CN1409431A

CN1409431A - Charging method for accumulator

Info

Publication number: CN1409431A
Application number: CN01126943A
Authority: CN
Inventors: 严宏明; 马建军
Original assignee: Shanghai No 2 Research Institute of ZTE Corp
Current assignee: ZTE Corp
Priority date: 2001-09-26
Filing date: 2001-09-26
Publication date: 2003-04-09
Anticipated expiration: 2021-09-26
Also published as: CN1252857C

Abstract

A charging method for storage battery incldues the following steps: 1. real-time sampling systematic output voltage or the battery voltage VI before turned-on; 2. calculating allowable current I of constant charging; 3. when entering into the charging step, first of all adjusting the rectifier output V to a bit higher than the system output voltage or the battery voltage VI before turned on; 4. real time sampling the charging current i of the battery; 5. computing the differential value delta between sampled current; and constant charging current I; 6. further adjusting the rectifier output voltage V in line with the value delta and continuing with step 4,5,6, to keep the charging current within 90%-100% of constant charging allowable current I.

Description

A kind of accumulator charging method

Technical field

The invention discloses a kind of charge in batteries management method, relate to the accumulator cell management method of communication power supply and ups power etc.

Background technology

The back-up source of storage battery during as mains failure is the requisite part of the power supply system for communications.The Charge Management of storage battery comprises two kinds: a kind of is to be in regularly all filling of carrying out behind the floating charge state for a long time; Another kind is the boost charge after the civil power outage is sent a telegram here again.The charging of storage battery is the first constant current process of constant voltage again, and constant-current phase is most important, and its size of current has certain limitation, generally can not surpass 20～25% (this ratio is called as charging current ratio) of its capacity, otherwise can damage battery.The mode of restriction charging current has two kinds in traditional charge in batteries management: pressure regulation or current limliting.Voltage regulating mode is to limit charging current by the output voltage of regulating rectifier, and is too high too fast if output voltage is regulated though this mode is simple, unreliable, and electric current is crossed conference and caused battery to damage; If regulated lowly, then can cause undercharge or even storage battery to continue discharge.Current-limiting mode then is the purpose that reaches the restriction charging current by the output current limiting point that rectifier directly is set, it is direct that this mode seems, can put in place by step joint, but require rectifier must possess the function of constant current output, and rectifier output ripple under this working method is bigger, and is all unfavorable to storage battery and rectifier itself.

Number of patent application is 94227897 " the compensation constant current auto charge and discharge of storage battery device ", it is the compensation constant current auto charge and discharge of a kind of storage battery device, constitute by hardware and software, comprise voltage compensation unit, rectification unit, current sampling sensing unit, battery set charge/discharge converting unit, manual control unit, servo unit, monitoring unit, electric controling switch and alarm unit.This is a kind of independently charge and discharge device, and its voltage compensation is realized by hardware.And for the power supply system for communications, its rectifier itself just possesses the charging ability to storage battery, there is no need to be equipped with extra charging device again.In addition, the discharge of power supply system for communications batteries is carried out load, does not need electric discharge device.The charging of storage battery can be divided into constant current charge and two stages of constant voltage charge in the power supply system for communications, the key of Charge Management is how to control the output voltage and the output current of rectifier rightly, make its each stage charge characteristic that satisfies storage battery, prolong the useful life of storage battery.

Summary of the invention

Technical problem to be solved by this invention is that to overcome in the existing charge in batteries administrative skill charge-current limit means single, and because charging current is regulated the improper storage battery infringement problem of bringing.

The core concept of accumulator for communication power supply charging method of the present invention is: during the charging beginning, regulate the rectifier output voltage earlier, utilize detected charge in batteries electric current as closed loop feedback simultaneously, in time revise the output voltage set-point, the electric current when beginning to guarantee to charge is in stablizing reasonable range.Its treatment step is as follows: 1. real-time sampling system output voltage or the incoming call before battery tension V1; 2. calculate constant current charge and allow electric current I=charging current ratio Q * storage battery total capacity C; Charging current ratio Q can be set by the user, also can get a default value, and scope is generally between 20～25%.For example: when being set at 20%, constant current charge allows electric current I just should remain on about 0.2C when all filling beginning; 3. when entering the charging stage, at first regulate the rectifier output voltage V to slightly higher, as high 0.05～0.2 volt than the battery tension V1 before system output voltage or the incoming call; 4. real-time sampling charge in batteries current i; 5. the value of delta of calculating sampling current i and constant current charge electric current I: when i allows electric current I greater than constant current charge, δ=i-I; When i allows electric current I less than 90% constant current charge, δ=i-0.9I; When i is in 90%～100% constant current charge allows the electric current I scope, δ=0.Why getting 90% is in order to prevent that charging current from just when constant current charge allows near the electric current I, causing the adjusting back and forth of output voltage to form vibration; 6. according to the δ value rectifier output voltage V is done further to regulate, generally speaking be exactly: if the output voltage set-point is suitably turned down in δ＞0; If the output voltage set-point is suitably heightened in δ＜0; If δ=0 is not then regulated output voltage; Here the adjusting to the output voltage set-point has following requirement: 1) ceiling restriction is arranged, and output voltage is the highest can not to surpass the even charging voltage of setting; 2) lower limit restriction is arranged, output voltage is minimum can not to be lower than piezoelectric voltage under the secondary system; 3) the step-length L of Tiao Jieing should be variable, specifically according to the δ value size decision that calculates in the step 5; Adopting the benefit of variable step size is fast and reliable, prevents to overcharge, that is strengthens when the δ value is big and regulate step-length, output voltage can be regulated apace put in place; Hour dwindle the adjusting step-length when the δ value, overcharge to prevent; 7. continue step 4,5 and 6, the constant constant current charge 90%～100% of charging current is allowed in the electric current I scope.

Adopt the method for the invention, compared with prior art, can make the adjusting of output voltage just right, overcome the excessive or too small problem of the charging current that simple voltage regulating mode brought, avoided accumulator super-charge or crossed putting; And applied widely, can not adopt the simple mode that current-limiting points is set for the rectifier that does not possess the constant current output function, and this output voltage regulative mode that utilizes charging current to make closed loop feedback can use freely; Can realize the automatic Charge Management of storage battery in addition safely, quickly and efficiently, help the unattended operation of communication power supply and backup battery group; And accomplished the useful life that prolongs storage battery most possibly,, saved user's equipment investment for the user brings the highest investment repayment.

Description of drawings Fig. 1 is the explanation comparatively detailed to technical scheme.Fig. 2 is the specific embodiment flow chart of the inventive method.

Embodiment

Be described in further detail below in conjunction with the technical scheme of the drawings and specific embodiments this aspect:

Fig. 1 is the explanation comparatively detailed to technical scheme, existing corresponding description the in technical scheme.

Fig. 2 is that reserve 200AH (ampere-hour) batteries with a kind of 300A integrated drive generator is an example, supposes currently for the incoming call back that has a power failure again battery to be carried out boost charge, and charging current ratio Q is set at 20%.Adopt the treatment step of this method as follows: 1. the real-time sampling battery tension V1=50V of previous moment that obtains sending a telegram here; 2. calculate constant current charge and allow electric current I=charging current ratio Q * storage battery total capacity C=20% * 200=40A; 3. when entering the charging stage, at first regulate the rectifier output voltage to=50.1 volts of V1+0.1 volts; 4. real-time sampling charge in batteries current i; 5. the value of delta of calculating sampling current i and constant current charge electric current I: as i during greater than 40A, δ=i-40; When i allows electric current I less than 90% constant current charge, promptly during 36A, δ=i-36; When i is in 36A～40A scope, δ=0; 6. according to the δ value rectifier output voltage is done further to regulate: if δ＜0 is suitably heightened the output voltage set-point, but can not be higher than the even charging voltage 56.4V of setting; If δ＞0 is suitably turned down the output voltage set-point, but can not be lower than the second voltage 44V of setting; If δ=0, then output voltage is not regulated: it is as follows specifically to regulate step-length L: when | δ | during＞15A, step-length L gets 0.15V; When 15A 〉=| δ | during 〉=5A, step-length L gets 0.1V; When 0＜| δ | during＜5A, step-length L gets 0.05V; When | δ | in the time of=0, step-length L gets 0V; 7. continue step 4,5 and 6, charging current is constant in 36A～40A scope.

In sum, this method proposes to regulate the output voltage set-point first when charge in batteries, utilize actual charge current as closed loop feedback simultaneously, according to this set-point of actual charge current size real-time regulated, current stabilization is near constant current charge allows electric current when guaranteeing all to fill, prolonged the useful life of batteries effectively, for the user has brought good economic benefit.

Claims

1, a kind of accumulator charging method comprises the steps:

1) the battery tension V1 before real-time sampling system output voltage or the incoming call;

2) calculate constant current charge and allow electric current I;

3) when entering the charging stage, regulate the rectifier output voltage V extremely than system output voltage

Or the battery tension V1 before the incoming call is slightly high;

4) real-time sampling charge in batteries current i;

5) value of delta of calculating sampling current i and constant current charge electric current I;

6) according to the δ value rectifier output voltage V is done further to regulate: if suitably transfer δ＞0

The low output voltage set-point; If the output voltage set-point is suitably heightened in δ＜0; If δ=0,

Then output voltage is not regulated;

7) continue step 4), 5) and 6), charging current is constant in 90%～100% perseverance

Current charge allows in the electric current I scope.

2, a kind of accumulator charging method according to claim 1 is characterized in that the value of delta in the described step 5) is calculated as follows: when i allows electric current I greater than constant current charge, and δ=i-I; When i allows electric current I less than 90% constant current charge, δ=i-0.9I; When i is in 90%～100% constant current charge allows the electric current I scope, δ=0.

3, a kind of accumulator charging method according to claim 1 is characterized in that in the described step 6), also will satisfy the highest even charging voltage that can not surpass set to the adjusting of output voltage set-point, minimumly can not be lower than piezoelectric voltage under the secondary system.

4, according to claim 1 or 3 described a kind of accumulator charging methods, it is characterized in that: during to the adjusting of output voltage set-point, it is variable regulating step-length L.

5, a kind of accumulator charging method according to claim 4 is characterized in that: described adjusting step-length is according to the decision of the δ value that calculates in step 5) size, promptly strengthens the adjusting step-length when δ value is big, when the δ value than hour dwindling the adjusting step-length.