Intelligent lithium battery charger

Abstract

The invention discloses an intelligent lithium battery charger, of which one interface is a special lithium battery charging interface and the other interface is a standard USB charging interface. The special lithium battery charging interface can be used for charging the lithium batteries of three voltage systems (7.2V system, 14.4V system and 25.2 system), and the charging interface can identify the lithium batteries of three voltage systems above and automatically regulate charging cut-off voltage; and the standard USB charging interface can be used for charging devices capable of being charged through a USB, or civil terminals, thus, personal needs of soldiers are satisfied. Default setting of charging current of the special lithium battery charging interface is 1A, and the charging current can be regulated in a range of 1A-4A, so that the batteries with different capacity can be charged; and the charging current of the standard USB charging interface is fixed 1A.

Description

technical field

[0001] The invention belongs to the field of DC power supply and charger. Background technique

[0002] At present, many military or civilian equipment use lithium batteries as power supply. After investigation, most of the lithium batteries used in military equipment are 7.2V, 14.4V, and 25.2V. Battery. When the army purchases each lithium battery, it is equipped with a lithium battery charger. Over time, the army has accumulated a large number of lithium battery charging equipment. The more equipment each soldier uses, the more charger equipment he needs to carry when he is on duty or performing tasks, and the use method of each lithium battery charger is different due to different manufacturers, so it takes time for soldiers to learn The lithium battery charger equipped by the battery manufacturer often only uses one input mode, that is, AC200V AC input, but some combat vehicles in the army do not have AC220V AC power supply, only DC24V DC power supply, ...

Examples

Embodiment approach

[0050] Figure 11 For the schematic diagram of the control circuit, the circuit is mainly composed of a piece of MCU. By sampling signals such as voltage, current and temperature, the feedback circuit of the power conversion circuit is intervened to make it output the predetermined charging voltage and charging current, and through the charging current signal Determine whether the battery is fully charged and send a signal to the indicator light for display.

[0051] Implementation of temperature sampling circuit

[0052] Figure 12 It is the schematic diagram of the temperature sampling circuit, and V1 in the figure is a temperature / voltage converter, which can convert the ambient temperature into a voltage signal and send it to the A / D sampling terminal of the MCU.

technical field

[0001] The invention belongs to the field of DC power supply and charger. Background technique

[0002] At present, many military or civilian equipment use lithium batteries as power supply. After investigation, most of the lithium batteries used in military equipment are 7.2V, 14.4V, and 25.2V. Battery. When the army purchases each lithium battery, it is equipped with a lithium battery charger. Over time, the army has accumulated a large number of lithium battery charging equipment. The more equipment each soldier uses, the more charger equipment he needs to carry when he is on duty or performing tasks, and the use method of each lithium battery charger is different due to different manufacturers, so it takes time for soldiers to learn The lithium battery charger equipped by the battery manufacturer often only uses one input mode, that is, AC200V AC input, but some combat vehicles in the army do not have AC220V AC power supply, only DC24V DC power supply, ...

Examples

Embodiment approach

[0050] Figure 11 For the schematic diagram of the control circuit, the circuit is mainly composed of a piece of MCU. By sampling signals such as voltage, current and temperature, the feedback circuit of the power conversion circuit is intervened to make it output the predetermined charging voltage and charging current, and through the charging current signal Determine whether the battery is fully charged and send a signal to the indicator light for display.

[0051] Implementation of temperature sampling circuit

[0052] Figure 12 It is the schematic diagram of the temperature sampling circuit, and V1 in the figure is a temperature / voltage converter, which can convert the ambient temperature into a voltage signal and send it to the A / D sampling terminal of the MCU.

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