A serial communication architecture based on the control module of a serial power supply device

Abstract

The invention discloses a control-module-based serial communication framework of a serial power supply device. The serial communication framework comprises the serial power supply device and a main controller, the serial power supply device is formed by connecting foundation units in a series, each foundation unit is composed of one or more power supply devices, a control module is arranged between every two adjacent foundation units, each control module at a low-voltage side is in communication connection with an adjacent control module at the high-voltage side are in a unvarnished transmission and cascading switching serial mode, and the main controller is respectively connected with the control module at the highest-voltage side and the control module at the lowest-voltage side through a separation device. The control-module-based serial communication framework of the serial power supply device has the advantages of being low in cost, free of complicated control units, capable of greatly reducing the complexity of internal leads of the power supply device, and very simple in structure.

Description

technical field [0001] The invention relates to a serial communication framework based on a control module of a serial power supply device. Background technique [0002] With the development of new energy technology, power supply devices that use multiple energy cells in series to provide energy are becoming more and more common. Typical examples include lithium batteries in multi-stage series, photovoltaic panels in multi-stage series and other power supply devices. In order to consider safety, reliability and efficient energy utilization, such series power supply devices often need to be connected in parallel with a management system. The principle block diagram is as follows: figure 1 shown. Taking a typical battery management system as an example, the LTC6802 is generally used as the analog front end of the management system at present. The adjacent connection points of the series batteries need to be connected to the LTC6802, and the latter will collect the battery vol...

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Problems solved by technology

[0004] 1. The voltage sampling leads are complicated, and each battery tap must be lead to the main control board

[0005] 2. The function is simple, often only can complete the basic signal sampling function

[0006] 3. The ability to handle abnormalities is weak. If there are abnormalities such as voltage and temperature, the main control needs to poll and cannot actively report

[0007] 4. The cost of adding the active balance function is relatively high, mainly in the following points:

[0009] b. Currently, the CAN interface is generally used for the control of active equalization, but it is relatively complicated and the implementation cost is high;

[0010] c. Since the equalization modules do not share the same ground, the CAN interface of all control modules must add an isolation chip, which will inevitably increase the complexity of the leads, the volume of the entire battery system, and the overall cost

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