Battery Switch Driving Circuit With Adjustable MOSFET Gate Boost
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Solution Overview
Problem
Existing battery management systems (BMS) face limitations in expandability and cost due to the restricted switch-driving capability of internal circuits, particularly when using NMOS as a positive-terminal main switch or isolated power supply modules.
Innovation Solution
A switch driving circuit and battery controlling circuit design that includes a switch driving port, discharge circuit, voltage generating circuit, and port conduction circuit, allowing for flexible adjustment of drive voltage and capability, with components such as electronic switches, resistors, diodes, and capacitors to enhance expandability and reduce costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an NMOS or isolated power supply module is used in the BMS, then the switch can be turned on or off, but the switch-driving capability is restricted by the internal circuit of the switching chip and the cost is high
Solution Approach 1:
The patent divides the switch-driving function into separate modular circuits: a voltage generating circuit that boosts voltage from the battery negative terminal, a port conduction circuit with controllable switches, and a discharge circuit. This segmentation allows independent optimization of each module, expanding switch-driving capability without increasing overall system complexity.
Solution Approach 2:
The voltage generating circuit is designed to provide driving voltage for multiple switches simultaneously, and the port conduction circuit can control different battery terminals (positive and negative) through the same basic circuit structure. This multi-functionality eliminates the need for separate driving circuits for each switch, reducing complexity while enhancing versatility.
2Adaptability or versatility
If an NMOS or isolated power supply module is used in the BMS, then the switch can be turned on or off, but the cost is high
Solution Approach 1:
The voltage generating circuit draws power directly from the battery negative terminal and uses the battery's own voltage to generate the driving voltage for switches. This self-service approach eliminates the need for external isolated power supply modules, significantly reducing component costs while maintaining switch-driving capability.
Solution Approach 2:
The patent replaces expensive isolated power supply modules with a cost-effective voltage boosting circuit using simple components like diodes, capacitors, and transistors. These cheaper components achieve the same functional result, making the system more manufacturable without sacrificing adaptability.
3Device complexity
If a fixed internal circuit is used in the switching chip, then the circuit is simple, but the drive voltage and drive capability cannot be flexibly adjusted
Solution Approach 1:
The patent implements dynamic adjustability through the port conduction circuit, which uses control signals to dynamically switch between different conduction states and voltage levels. The microcontroller can dynamically adjust the driving voltage and capability based on real-time battery status and switching requirements, transforming a static circuit into a flexible, adaptive system.
Solution Approach 2:
The voltage generating circuit can change its output voltage parameter based on control signals, allowing the drive voltage to be adjusted from the battery negative terminal voltage to higher levels as needed. This parameter variability enables flexible adaptation to different switching requirements without changing the basic circuit structure.
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 provides a highly expandable and cost-effective battery management system with flexible drive voltage and capability adjustments, enabling efficient control of electronic switch modules connected to the battery controlling circuit.
Implementation Method 1
the voltage generating circuit boosts the supply voltage to a driving voltage according to an output signal of a microcontroller
Data Source
AI summary
The present disclosure provides a switch driving circuit, the switch driving circuit includes a discharge circuit, a switch driving port, a voltage generating circuit, and a port conduction circuit. The discharge circuit supplies a voltage to the voltage generating circuit. The voltage generating circuit boosts the voltage to a driving voltage according to signal outputted by a microcontroller. The driving voltage controls an electronic switch module connected to the switch driving port to turn on or turn off. The port conduction circuit controls the switch driving port to make a connection between the voltage generating circuit and the electronic switch module according to a first control signal of the microcontroller. The present disclosure also provides a battery controlling circuit. The switch driving circuit and battery controlling circuit provided according to the embodiments of the present disclosure have functions safety requirements, strong scalability, low cost, and the drive voltage and drive capacity can be flexibly adjusted.