Battery Control Circuit for Stable Daisy-Chain Voltage Communication
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Solution Overview
Problem
Existing battery control systems face instability in communication signals when voltage detection circuits are connected in a daisy chain manner, leading to potential inaccuracies in voltage detection and communication between circuits and the control device.
Innovation Solution
A battery control device with voltage detection circuits connected through communication cables with coupling capacitors, where communication terminals are grounded through a passive circuit comprising resistors and capacitors, ensuring stable communication signal potential by suppressing noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If voltage detection circuits are connected in a daisy chain manner through capacitors to electrically insulate each circuit and reduce noise influence, then noise resistance is improved, but communication signal potential stability deteriorates
Solution Approach 1:
The patent introduces a communication signal potential stabilization circuit as an intermediary component between the capacitive coupling elements. This stabilization circuit actively maintains the potential of communication signals passing through the daisy-chain connected voltage detection circuits, preventing potential drift caused by the capacitive coupling while still allowing the capacitors to provide noise isolation. The stabilization circuit acts as a mediator that reconciles the conflicting requirements of noise resistance and signal stability.
Solution Approach 2:
The patent implements a feedback mechanism where the communication signal potential is continuously monitored and adjusted by the stabilization circuit. The stabilization circuit detects potential deviations in the communication signal and applies corrective action to maintain stable potential levels. This feedback approach allows the system to dynamically compensate for the destabilizing effects of capacitive coupling while preserving the noise isolation benefits.
2Reliability
If voltage detection circuits are electrically insulated through capacitors in communication lines, then reliable operation of each circuit is improved, but accurate communication between circuits and control device deteriorates
Solution Approach 1:
The communication signal potential stabilization circuit serves as an intermediary that bridges the electrically insulated voltage detection circuits and the control device. It ensures that communication signals maintain their integrity and potential stability as they pass through the capacitive coupling boundaries, preventing information loss while preserving the electrical insulation that provides reliability.
Solution Approach 2:
The stabilization circuit employs feedback mechanisms to monitor and correct communication signal quality. By detecting potential instability or distortion in communication signals and applying real-time corrections, the system maintains accurate communication between the electrically insulated voltage detection circuits and the control device, preventing information loss.
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 stabilizes communication signal potential, reducing noise interference and ensuring accurate communication between voltage detection circuits and the control device, thereby enhancing the reliability of battery control operations.
Implementation Method 1
the first capacitors are inserted into the communication lines connecting the plurality of voltage detection circuits to electrically insulate each voltage detection circuit
Implementation Method 2
Communication terminals connected to the communication cables in the voltage detection circuit are grounded through a predetermined passive circuit
Implementation Method 3
a passive circuit comprising resistors and capacitors, ensuring stable communication signal potential by suppressing noise interference
Data Source
AI summary
A battery control device includes a plurality of voltage detection circuits that are provided so as to correspond to a plurality of battery modules constituting a battery and detect voltages of the battery modules; a plurality of communication cables that connect the voltage detection circuits in a daisy chain manner through coupling capacitors; and a control circuit that transmits and receives communication signals to and from the voltage detection circuits through the communication cables and controls the battery on the basis of the voltages received from the voltage detection circuits. Communication terminals connected to the communication cables in the voltage detection circuit are grounded through a predetermined passive circuit.