CN110808621B - Overcurrent control method based on Wsa charging curve - Google Patents
Overcurrent control method based on Wsa charging curve Download PDFInfo
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- CN110808621B CN110808621B CN201911040024.9A CN201911040024A CN110808621B CN 110808621 B CN110808621 B CN 110808621B CN 201911040024 A CN201911040024 A CN 201911040024A CN 110808621 B CN110808621 B CN 110808621B
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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Abstract
The invention discloses an overcurrent control method based on a Wsa charging curve, which is characterized in that the current value on the Wsa charging curve is calculated theoretically by monitoring the voltage of a storage battery and the voltage value of a power grid in the whole charging process, and different charging current overcurrent protection values are automatically set at different positions of the Wsa charging curve. And at any position of the Wsa charging curve, theoretical charging current values under the voltage of the storage battery and the voltage value of the power grid are distributed in a certain range, and if the actually measured charging current exceeds 1.3 times of the upper limit or the lower limit of the theoretical charging current value, the charger judges that the charging is over-current and stops charging. The invention can play a role in protecting the lead-acid storage battery.
Description
Technical Field
The invention relates to the technical field of lead-acid storage battery charging, in particular to an overcurrent control method based on a Wsa charging curve.
Background
Referring to fig. 1 and 2, it can be seen that the Wsa charging curve, the charging current decreases as the battery voltage increases, and in addition, the charging current also increases as the input grid voltage increases, and the grid voltage decreases; the charging current is not a fixed value, so the fixed upper and lower limits cannot be used as the current protection value.
Disclosure of Invention
The invention aims to solve the technical problem that the current upper limit and the current lower limit of the existing lead-acid storage battery cannot be used as current protection values in the fixed charging process, and provides an overcurrent control method based on a Wsa charging curve.
The technical problems to be solved by the invention can be realized by the following technical scheme:
according to the overcurrent control method based on the Wsa charging curve, the current value on the Wsa charging curve is calculated theoretically by monitoring the voltage of the storage battery and the voltage value of the power grid in the whole charging process, and different charging current overcurrent protection values are automatically set at different positions of the Wsa charging curve; and at any position of the Wsa charging curve, theoretical charging current values under the voltage of the storage battery and the voltage value of the power grid are distributed in a certain range, and if the actually measured charging current exceeds 1.3 times of the upper limit or the lower limit of the theoretical charging current value, the charger judges that the charging is over-current and stops charging.
In a preferred embodiment of the present invention, the theoretical charging current value calculated from the electrical performance characteristics of the charging machine is calculated as follows:
real_current＝current_spec*[1-1.75*(1-std_cell_volt/battery_volt)]
wherein real_current is a theoretical calculated current value, current_spec is a current specification of a charger, std_cell_volt is rated single cell voltage=2 volts, and battery_volt is an actual single cell voltage measured in a charging process;
the correction values obtained for the different grid voltages are as follows:
ac_current_delta= (current_spec 0.15) |ac_volt_temp-rated grid voltage|/20, ac_volt_temp is the actual grid voltage measured during charging, current_spec is the current specification of the charger;
when ac_volt_temp > charger rated grid voltage specification:
real_current1＝(real_current+AC_current_delta)
otherwise
real_current1＝(real_current-AC_current_delta)
And then modified by the following formula.
real_current2＝(real_current-(battery_volt-std_cell_volt)*10)
And finally obtaining a theoretical calculation charging current value real_current2.
Due to the adoption of the technical scheme, the lead-acid storage battery can play a role in protecting the lead-acid storage battery.
Drawings
Fig. 1 is a schematic diagram of a charging curve of a lead-acid battery Wsa.
FIG. 2 is a schematic diagram of electrical performance test data for electrical performance of a CZB6E-D48V80A lead acid battery under regulated power input.
FIG. 3 is a schematic diagram of a current limit for a charging curve of a lead-acid battery Wsa.
Detailed Description
The invention is further described below with reference to the drawings and detailed description.
According to the overcurrent control method based on the Wsa charging curve, the current value on the Wsa charging curve is calculated theoretically by monitoring the voltage of the storage battery and the voltage value of the power grid in the whole charging process, and different charging current overcurrent protection values are automatically set at different positions of the Wsa charging curve.
Referring to fig. 3, at any position of the Wsa charging curve, theoretical charging current values under the voltage of the storage battery and the voltage value of the power grid are distributed in a certain range, and if the actually measured charging current exceeds 1.3 times of the upper limit a or the lower limit B of the theoretical charging current value, the charger judges that the charging is over-current and stops charging.
The theoretical charging current value calculated according to the electrical performance characteristics of the charging machine is as follows:
real_current＝current_spec*[1-1.75*(1-std_cell_volt/battery_volt)]
wherein real_current is a theoretical calculated current value, current_spec is a current specification of a charger, std_cell_volt is rated single cell voltage=2 volts, and battery_volt is an actual single cell voltage measured in a charging process;
the correction values obtained for the different grid voltages are as follows:
ac_current_delta= (current_spec 0.15) |ac_volt_temp-rated grid voltage|/20, ac_volt_temp is the actual grid voltage measured during charging, current_spec is the current specification of the charger;
when ac_volt_temp > charger rated grid voltage specification:
real_current1＝(real_current+AC_current_delta)
otherwise
real_current1＝(real_current-AC_current_delta)
And then modified by the following formula.
real_current2＝(real_current-(battery_volt-std_cell_volt)*10)
And finally obtaining a theoretical calculation charging current value real_current2. And stopping charging if the actually measured charging current exceeds the theoretical calculated charging current by 1.3 times, and prompting an overcurrent fault by the charger.
Theoretical charging current value calculation example values are shown in table 1 below (charger rated grid voltage specification=220, charger current specification=35a)
TABLE 1
Claims (1)
1. The overcurrent control method based on the Wsa charging curve is characterized in that the current value on the Wsa charging curve is calculated theoretically by monitoring the voltage of a storage battery and the voltage value of a power grid in the whole charging process, and different charging current overcurrent protection values are automatically set at different positions of the Wsa charging curve; at any position of the Wsa charging curve, theoretical charging current values under the voltage of the storage battery and the voltage value of the power grid are distributed in a certain range, and if the actually measured charging current exceeds 1.3 times of the upper limit or the lower limit of the theoretical charging current value, the charger judges that the charging is stopped due to over-current charging;
the theoretical charging current value calculated according to the electrical performance characteristics of the charging machine is as follows:
real_current＝current_spec*[1-1.75*(1-std_cell_volt/battery_volt)]
wherein real_current is a theoretical calculated current value, current_spec is a current specification of a charger, std_cell_volt is rated single cell voltage=2 volts, and battery_volt is an actual single cell voltage measured in a charging process;
the correction values obtained for the different grid voltages are as follows:
ac_current_delta= (current_spec 0.15) |ac_volt_temp-rated grid voltage|/20, ac_volt_temp is the actual grid voltage measured during charging, current_spec is the current specification of the charger;
when ac_volt_temp > charger rated grid voltage specification:
real_current1＝(real_current+AC_current_delta)
otherwise
real_current1＝(real_current-AC_current_delta)
And then modified by the following formula.
real_current2= (real_current- (battery_volt-std_cell_volt) 10) the theoretical calculated charging current value real_current2 is finally obtained.
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| CN201911040024.9A CN110808621B (en) | 2019-10-29 | 2019-10-29 | Overcurrent control method based on Wsa charging curve |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1193214A (en) * | 1997-03-06 | 1998-09-16 | 株式会社Jnt | Charging method for secondary cell and charging device thereof |
| JP2009183141A (en) * | 1999-03-25 | 2009-08-13 | Tyco Electronics Corp | Devices and methods for protection of rechargeable elements |
| CN103490111A (en) * | 2013-08-06 | 2014-01-01 | 重庆邮电大学 | Sectional type constant voltage and constant current charging method |
| CN104184132A (en) * | 2014-09-17 | 2014-12-03 | 中颖电子股份有限公司 | Dynamic overcurrent protection method for lithium batteries |
| CN107979119A (en) * | 2016-10-21 | 2018-05-01 | 广州市君盘实业股份有限公司 | Maas is fitted the battery charging control method and system of charging curve |
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2019
- 2019-10-29 CN CN201911040024.9A patent/CN110808621B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1193214A (en) * | 1997-03-06 | 1998-09-16 | 株式会社Jnt | Charging method for secondary cell and charging device thereof |
| JP2009183141A (en) * | 1999-03-25 | 2009-08-13 | Tyco Electronics Corp | Devices and methods for protection of rechargeable elements |
| CN103490111A (en) * | 2013-08-06 | 2014-01-01 | 重庆邮电大学 | Sectional type constant voltage and constant current charging method |
| CN104184132A (en) * | 2014-09-17 | 2014-12-03 | 中颖电子股份有限公司 | Dynamic overcurrent protection method for lithium batteries |
| CN107979119A (en) * | 2016-10-21 | 2018-05-01 | 广州市君盘实业股份有限公司 | Maas is fitted the battery charging control method and system of charging curve |
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