Battery Detection Circuit With ADC Disconnect for Absent Cells
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Solution Overview
Problem
Motherboards used in systems requiring and not requiring a battery connection face unpredictable voltage readings due to the absence of a battery, leading to incorrect determinations by upper-layer software and increased manufacturing costs for differentiating motherboards.
Innovation Solution
A battery detection circuit incorporating a power-on-reset (POR) block, analog-to-digital converter (ADC), and logic control circuit to detect and manage battery presence, ensuring accurate voltage readings by disconnecting the ADC when no battery is present, using a switch circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the voltage reading circuit continuously reads battery voltage, then the battery voltage can be monitored, but power is consumed unnecessarily when no battery is present
Solution Approach 1:
The patent applies dynamics by making the connection between the voltage reading circuit and battery dynamic rather than static. A switch circuit controlled by the logic control circuit dynamically connects or disconnects the ADC circuit to the battery voltage node based on battery presence detection, allowing the system to adapt its power consumption state to operational needs
2Adaptability or versatility
If the motherboard is designed to work with battery, then battery functions can be provided, but manufacturing costs increase for systems that don't require battery
Solution Approach 1:
The patent implements universality by designing a single motherboard platform that can support both battery-powered and non-battery-powered systems. The detection circuit automatically adapts to the presence or absence of a battery, allowing the same hardware design to serve multiple application scenarios without requiring separate manufacturing lines
3Ease of operation
If the ADC circuit reads battery voltage without detection, then voltage reading is simple, but incorrect readings occur when no battery is present
Solution Approach 1:
The patent applies preliminary action by performing battery presence detection before the voltage reading operation. The logic control circuit first determines whether a battery is connected, and only then enables the ADC circuit to perform voltage reading, preventing incorrect readings from occurring in the first place
Data Source
AI summary
A circuit for battery detection including a power-on reset (POR) block, an analog-to-digital converter (ADC) circuit, a switch circuit, and a logic control circuit is provided. The POR block is coupled to a node and is configured to output an output voltage with logic high level or logic low level when the node has a battery voltage higher or lower than a preset value, respectively. The switch circuit is coupled to the logic control circuit and the ADC circuit. The logic control circuit is coupled to the POR block and is configured to generate a control signal with the logic low level when the output voltage is at the logic low level, so that the switch circuit disconnects the ADC circuit and the node, and the ADC circuit does not read the battery voltage.