CN110808621A - Over-current control method based on Wsa charging curve - Google Patents
Over-current control method based on Wsa charging curve Download PDFInfo
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- CN110808621A CN110808621A CN201911040024.9A CN201911040024A CN110808621A CN 110808621 A CN110808621 A CN 110808621A CN 201911040024 A CN201911040024 A CN 201911040024A CN 110808621 A CN110808621 A CN 110808621A
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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
Abstract
The invention discloses an overcurrent control method based on a Wsa charging curve, which is characterized in that the voltage of a storage battery and the voltage value of a power grid are monitored in the whole charging process, the current value on the Wsa charging curve theoretically is calculated, and different charging current overcurrent protection values are automatically set at different positions of the Wsa curve. And at any position of the Wsa charging curve, theoretical charging current values under the voltage values of the storage battery and 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 overcurrent. The invention can protect 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 in the Wsa charging curve, the charging current decreases as the voltage of the storage battery 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 protection value of the existing lead-acid storage battery cannot be determined by the fixed upper and lower current limits in the charging process, and provides an overcurrent control method based on a Wsa charging curve.
The technical problem to be solved by the invention can be realized by the following technical scheme:
an overcurrent control method based on a Wsa charging curve is characterized in that the voltage of a storage battery and the voltage value of a power grid are monitored in the whole charging process, the current value on the Wsa charging curve theoretically is calculated, and different charging current overcurrent protection values are automatically set at different positions of the Wsa curve; and at any position of the Wsa charging curve, theoretical charging current values under the voltage values of the storage battery and 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 overcurrent.
In a preferred embodiment of the present invention, the theoretical charging current value calculation formula derived from the electrical performance characteristics of the charger is as follows:
real_current＝current_spec*[1-1.75*(1-std_cell_volt/battery_volt)]
the current _ current is a theoretically calculated current value, the current _ spec is a charger current specification, the std _ cell _ volt is a rated single-battery voltage which is 2 volts, and the battery _ volt is an actual single-battery voltage measured in the charging process;
the correction values obtained for 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 in the charging process, and current _ spec is the current specification of the charger;
when AC _ volt _ temp > the rated grid voltage specification of the charger:
real_current1＝(real_current+AC_current_delta)
otherwise
real_current1＝(real_current-AC_current_delta)
And then corrected using the following equation.
real_current2＝(real_current-(battery_volt-std_cell_volt)*10)
Finally, the theoretically calculated charging current value real _ current2 is obtained.
Due to the adoption of the technical scheme, the lead-acid storage battery protection device 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 property test data of electrical properties of a CZB6E-D48V80A lead-acid battery under input of a regulated power supply.
Fig. 3 is a schematic diagram of the current limit of the charging curve of the lead-acid storage battery Wsa.
Detailed Description
The invention is further described below in conjunction with the appended drawings and detailed description.
According to the overcurrent control method based on the Wsa charging curve, the voltage of the storage battery and the voltage value of a power grid are monitored in the whole charging process, the current value on the Wsa charging curve theoretically is calculated, and different charging current overcurrent protection values are automatically set at different positions of the Wsa curve.
Referring to fig. 3, at any position of the Wsa charging curve, theoretical charging current values under the voltage values of the storage battery and 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 determines that charging is stopped due to overcurrent.
The theoretical charging current numerical value calculation formula calculated according to the electrical property characteristics of the charger is as follows:
real_current＝current_spec*[1-1.75*(1-std_cell_volt/battery_volt)]
the current _ current is a theoretically calculated current value, the current _ spec is a charger current specification, the std _ cell _ volt is a rated single-battery voltage which is 2 volts, and the battery _ volt is an actual single-battery voltage measured in the charging process;
the correction values obtained for 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 in the charging process, and current _ spec is the current specification of the charger;
when AC _ volt _ temp > the rated grid voltage specification of the charger:
real_current1＝(real_current+AC_current_delta)
otherwise
real_current1＝(real_current-AC_current_delta)
And then corrected using the following equation.
real_current2＝(real_current-(battery_volt-std_cell_volt)*10)
Finally, the theoretically calculated charging current value real _ current2 is obtained. And stopping charging if the actually measured charging current exceeds the theoretically calculated charging current by 1.3 times, and prompting overcurrent faults by the charger.
The theoretical charging current value is calculated as the following table 1 (the rated grid voltage specification of the charger is 220, and the current specification of the charger is 35A)
TABLE 1
Claims (2)
1. An overcurrent control method based on a Wsa charging curve is characterized in that the current value on the theoretical Wsa charging curve is calculated 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 curve; and at any position of the Wsa charging curve, theoretical charging current values under the voltage values of the storage battery and 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 overcurrent.
2. The method as claimed in claim 1, wherein the theoretical charging current value calculated according to the electrical property of the charger is calculated according to the following formula:
real_current＝current_spec*[1-1.75*(1-std_cell_volt/battery_volt)]
the current _ current is a theoretically calculated current value, the current _ spec is a charger current specification, the std _ cell _ volt is a rated single-battery voltage which is 2 volts, and the battery _ volt is an actual single-battery voltage measured in the charging process;
the correction values obtained for 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 in the charging process, and current _ spec is the current specification of the charger;
when AC _ volt _ temp > the rated grid voltage specification of the charger:
real_current1＝(real_current+AC_current_delta)
otherwise
real_current1＝(real_current-AC_current_delta)
And then corrected using the following equation.
real_current2＝(real_current-(battery_volt-std_cell_volt)*10)
Finally, the theoretically calculated charging current value real _ current2 is obtained.
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| Application Number | Priority Date | Filing Date | Title |
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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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| 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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| CN110808621B (en) | 2023-06-27 |
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