Battery Charge Discharge Switch Control Circuit Integration
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Solution Overview
Problem
Conventional switch control circuits for battery management systems require additional circuitry to detect charger connections, load conditions, and abnormal states, increasing cost, size, and power consumption.
Innovation Solution
A control circuit that integrates driving terminals and detection circuitry to control switch status and detect interface conditions, eliminating the need for additional circuitry by using sense terminals, driving terminals, and control logic to determine charger presence, load status, and abnormal conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional circuitry is used to detect charger connections and load conditions, then detection accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines the detection circuitry and control logic into a single integrated control circuit that performs both switching control and condition detection functions. The control circuit monitors voltages at multiple terminals and detects interface status, charger connections, and load conditions without requiring separate additional detection circuits, thereby reducing overall device complexity while maintaining detection accuracy.
Solution Approach 2:
The control circuit is designed to perform multiple functions: it controls the charge and discharge switches, detects charger connections, monitors load conditions, and identifies abnormal states all through a single circuit. This multi-functional approach eliminates the need for separate specialized circuits for each detection task, reducing both complexity and cost.
2Measurement precision
If additional circuitry is used to detect charger connections and load conditions, then detection capability is improved, but manufacturing cost increases
Solution Approach 1:
By merging the detection functions into the existing control circuit, the patent reduces the total component count and PCB real estate required. This integration lowers manufacturing costs associated with component procurement, assembly, and board fabrication while preserving full detection capability for charger connections, load conditions, and abnormal states.
3Reliability
If additional circuitry is used to detect abnormal conditions, then reliability is improved, but power consumption increases
Solution Approach 1:
The control circuit performs detection functions using its existing operational resources without requiring additional active detection circuits that would consume extra power. The circuit leverages its normal voltage sensing and control operations to simultaneously detect abnormal conditions, thereby maintaining system reliability while avoiding additional power consumption from dedicated detection hardware.
Data Source
AI summary
A charge/discharge switch control circuit for a battery pack includes a set of driving terminals and detection circuitry coupled to the driving terminals. The driving terminals provide driving signals to control a status of a switch circuit to enable charging or discharging of the battery pack. The detection circuitry receives voltages at multiple terminals of the switch circuit, and detects a status of an interface of the battery pack according to the status of the switch circuit and a difference between the voltages. The interface can receive power to charge the battery pack and provide power from the battery pack to a load.