Charging Load Detection Circuit Using Pulse Voltage Frequency Variation
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Solution Overview
Problem
Current chargers consume excessive power to detect battery presence and type, failing to meet low-power consumption regulations due to the need for additional pins and continuous energy usage in the internal controller.
Innovation Solution
A charging load detection circuit that uses a frequency generation unit to produce a low-current pulse voltage with fixed frequency and amplitude, allowing the control unit to detect load presence and type without additional pins, and control the charging path accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the internal controller uses additional pins to detect battery presence and type, then the detection capability is improved, but the power consumption increases
Solution Approach 1:
The patent combines the battery detection function with the existing charging path pins, eliminating the need for additional detection pins. The same pins used for charging also serve for detecting battery presence and type by analyzing voltage characteristics during charging operation.
Solution Approach 2:
The charging path itself is used to perform the detection function. By monitoring the voltage characteristics during the charging process, the system automatically detects battery presence and type without requiring separate detection circuits or continuous controller operation.
2Measurement precision
If the controller continuously monitors the battery status, then the detection accuracy is improved, but the power consumption increases
Solution Approach 1:
Instead of continuous monitoring, the system performs detection periodically during charging cycles. The controller measures voltage characteristics at specific intervals (such as during voltage drops or transitions), achieving accurate detection while minimizing the time the controller remains active.
Solution Approach 2:
The system performs detection actions at predetermined moments in the charging process, such as when voltage drops occur or during specific charging phases. This timing-based approach ensures accurate detection while keeping the controller dormant during non-critical periods.
Data Source
AI summary
A charging load detection circuit includes a charging circuit, a frequency generation unit, and a control unit. The control unit controls the frequency generation unit to generate a pulse voltage with a fixed first frequency and a fixed first amplitude, and the frequency generation unit provides the pulse voltage to an output terminal of the charging circuit. The control unit detects whether a load is coupled to the output terminal by detecting whether the first frequency and the first amplitude are varied, and controls connecting or disconnecting a charging path of the charging circuit according to whether the load is coupled to the output terminal.