Voltage reduction method and voltage reduction circuit of battery pack

Abstract

The invention discloses a voltage reduction method and a voltage reduction circuit of a battery pack. According to the voltage reduction circuit, the first end of each positive electrode switch is connected with the positive electrode of a single battery while the second end is connected with one end of an output capacitor and a control end of a control center separately; the first end of each negative electrode switch is connected with the negative electrode of a single battery; and the two ends of the output capacitor are connected with a first voltage output end and a second voltage output end respectively. The voltage reduction method comprises the following steps of S1, calculating the number of sections of power supply single batteries in each time according to a target voltage; S2, determining switch combinations according to the number of sections of the power supply single batteries, and closing a switch combination; S3, determining the value of a load current, and calculating power supply time according to the value of the load current; S4, after passing the power supply time, disconnecting the current switch combination, and closing the next switch combination; and S5, repeatedly executing the step S3, realizing alternate closing of each switch combination, and outputting the target voltage. By adoption of the voltage reduction method and the voltage reduction circuit, conversion loss can be lowered, and interference generated by a switching circuit can be lowered.

Description

technical field [0001] The invention relates to the field of battery pack voltage drop circuits, in particular to a battery pack voltage drop method and a voltage drop circuit. Background technique [0002] With the widespread use of portable devices such as automotive electronics and home energy storage, the use of battery packs has become more and more extensive, and using battery packs for power supply has become a trend. Since the power and voltage requirements of the electrical equipment and the battery pack's own control circuit are different, it is necessary to set a conversion circuit in the circuit to convert the voltage of the battery pack into the voltage required by the electrical equipment, such as: switch control relay, etc. Moreover, the more switches, the greater the converted current, and the greater the loss of the conversion circuit. [0003] At present, the power supply circuit of the battery pack mainly reduces the loss caused by the large current by re...

AI Technical Summary

Problems solved by technology

In order to make up for the conversion loss, more batteries should be added when designing the product, and the conversion loss is converted into heat, so the battery must be cooled, which will increase the design volume of the product and increase the product development cost. It will also increase the difficulty of designing

In addition, as the load current increases in the existing common step-down circuit, the loss will further increase, and the circuit design will be more complicated

Images