Battery Switch Driving Circuit With Isolated Control Signal Path
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery technologies face challenges with electromagnetic interference from external static electricity and interference signals affecting the logic control circuit through the driving circuit of charging and discharging switches.
Innovation Solution
A switch driving circuit is designed with a charging switch and discharging switch connected in series, featuring a driving voltage generation module and an isolation switch. The isolation switch isolates the low-voltage control signal from the driving voltage signal, enhancing stability and reliability by preventing signal interference between the logic control circuit and the switch driving circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a driving circuit is used to control switching devices, then the switching control function is achieved, but electromagnetic interference from external static electricity or interference signals affects the logic control circuit
Solution Approach 1:
The patent divides the control system into two separate voltage domains: a first voltage domain for the logic control circuit and a second voltage domain for the switch driving circuit. This segmentation isolates the logic control circuit from electromagnetic interference in the high-voltage switching domain while maintaining independent functionality of both circuits.
Solution Approach 2:
The patent introduces a first isolation circuit as an intermediary between the logic control circuit and the switch driving circuit. This isolation circuit acts as a mediator that transfers control signals from the low-voltage logic domain to the high-voltage switching domain while blocking electromagnetic interference from propagating back to the logic control circuit.
2Productivity
If the driving voltage generation module directly connects to the switching device control, then the control efficiency is improved, but signal interference occurs between the logic control circuit and the switch driving circuit
Solution Approach 1:
The patent segments the voltage domains by introducing a second isolation circuit that separates the first voltage domain (logic control) from the second voltage domain (switch driving). This allows direct control connection for efficiency while preventing signal interference through domain isolation.
Solution Approach 2:
The second isolation circuit serves as an intermediary that enables efficient control signal transmission from the driving voltage generation module to the switching devices while blocking reverse interference signals from affecting the logic control circuit.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively isolates signal interference, improving the stability and reliability of the switch driving circuit, ensuring reliable operation of the battery management system and preventing damage from external electromagnetic interference.
Implementation Method 1
An input end of the transformer is electrically connected to an output end of the voltage converter. A first output end of the transformer is electrically connected to the first node, and a second output end of the transformer is electrically connected to the isolation switch. The transformer is configured to output the driving voltage.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
This application discloses a switch driving circuit, a battery management system, a battery pack, and an electrical device. The switch driving circuit includes: a charging switch (11) and a discharging switch (12) that are connected in series between a discharging terminal (P+/P-) and a cell module (B+/B-). A driving voltage generation module (20), the charging switch (11), and the discharging switch (12) are electrically connected to a first node (N1). The first node (N1) is electrically connected to an isolation ground end (GND1). The driving voltage generation module (20) is configured to boost an input voltage of the driving voltage generation module and output a driving voltage (Vdri). An isolation switch (30) is electrically connected to an output end of the driving voltage generation module (20) and a control end of the charging switch (11) and/or a control end of the discharging switch (12). The isolation switch (30) is configured to perform conduction in response to a control signal, and output the driving voltage (Vdri) to the control end of the charging switch (11) and/or the control end of the discharging switch (12).