Switch Array Driving Circuit for High-Voltage Battery Balancing
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Solution Overview
Problem
Existing driving circuits for switch arrays in battery modules require a high number of pin resources due to the need for high common-mode voltage handling, especially when driving batteries with higher potentials, which complicates chip design and increases the risk of voltage-related issues.
Innovation Solution
The proposed solution integrates a sub-driving circuit with a voltage generating unit, driving control circuit, and path switch, where the reference ground is set as the negative pole of the secondary output filter capacitor, allowing for efficient pin resource management and reduced voltage stress by using N-type MOSFETs and anti-parallel diodes to manage battery switch and direction switch operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If high common-mode voltage handling is implemented to drive batteries with higher potentials, then the driving capability is improved, but the number of pin resources increases
Solution Approach 1:
The patent sets the reference ground as the negative pole of the secondary output filter capacitor, creating an equipotential reference that allows the driving circuit to handle high common-mode voltages without requiring additional pins. This approach enables the circuit to adapt to batteries with higher potentials while maintaining the same pin configuration.
Solution Approach 2:
The patent changes the reference ground parameter from a traditional ground connection to the negative pole of the secondary output filter capacitor. This parameter change allows the driving circuit to accommodate varying battery voltages and high common-mode voltages without increasing pin resources, as the reference potential dynamically adapts to the operating conditions.
2Adaptability or versatility
If high common-mode voltage handling is implemented, then the driving capability is improved, but the chip design becomes more complex
Solution Approach 1:
By establishing the negative pole of the secondary output filter capacitor as the reference ground, the patent creates an equipotential reference that simplifies the chip design. This approach allows the driving circuit to handle high common-mode voltages inherently, without requiring complex additional circuitry or design modifications.
Solution Approach 2:
The patent makes the secondary output filter capacitor's negative pole serve multiple functions: it acts as both a filtering element and the reference ground for the driving circuit. This multi-functionality reduces the need for separate components and simplifies the overall chip design while maintaining high driving capability.
3Adaptability or versatility
If high common-mode voltage handling is implemented, then the driving capability is improved, but the risk of voltage-related issues increases
Solution Approach 1:
The patent reduces voltage-related risks by establishing an equipotential reference at the negative pole of the secondary output filter capacitor. This approach ensures that the driving circuit operates with a stable reference potential that adapts to high common-mode voltages, thereby maintaining reliability while improving driving capability.
Solution Approach 2:
The secondary output filter capacitor's negative pole serves as an intermediary reference point that mediates between the high-voltage battery terminals and the driving circuit. This intermediary reference reduces voltage stress on the driving components and minimizes the risk of voltage-related failures while enabling high-potential battery operation.
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
This approach simplifies chip design by reducing the number of pins required and enhances the chip's withstand voltage capabilities, ensuring reliable operation across varying battery module voltages without the need for excessive pin resources.
Implementation Method 1
a voltage generating unit configured to generate a driving voltage in response to an enable signal
Implementation Method 2
a path switch between the output terminal of the voltage generating unit and an output port of the sub-driving circuit, and configured to transmit or block the driving voltage generated by the voltage generating unit in response to a driving control signal
Data Source
AI summary
A driving circuit of a switch array for controlling one of a plurality of battery modules coupled in series, where: each battery module comprises a plurality of batteries coupled in series; the driving circuit is configured to generate corresponding driving signals to control corresponding switches in the switch array, such that one battery that is selected to be balanced, is coupled between positive and negative poles of a DC bus voltage; and a reference ground of the driving circuit is configured as the negative pole of the DC bus voltage.