Battery Power Supply Circuit for First-Coupling Power-Off Control
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Solution Overview
Problem
Existing power supply circuits in portable devices cannot accurately determine whether to turn off the power supply when a battery is first coupled, leading to potential unintentional power-on and battery consumption.
Innovation Solution
A power supply circuit with a discharge system that includes a power-off setting circuit, which sets the power supply to a power-off state when a non-input battery voltage changes to an input state and releases this state when power is received, ensuring the power supply remains off until the device is charged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power supply circuit automatically recovers circuit power supply when battery voltage is momentarily interrupted, then the power supply reliability is improved, but the power supply may be unintentionally turned on when battery is coupled for the first time causing battery consumption
Solution Approach 1:
The power-off setting circuit performs preliminary action by setting the power supply circuit to a power-off state when detecting that battery voltage is input to the discharge system circuit for the first time. This preliminary power-off setting prevents the power supply from being unintentionally turned on, thereby eliminating the harmful effect of battery consumption while maintaining the automatic recovery function for momentary interruptions.
2Measurement precision
If the momentary interruption recovery circuit detects battery voltage interruption after battery coupling, then the power supply control can distinguish between momentary interruption and first coupling, but it cannot determine whether to turn off power supply when battery is coupled for the first time
Solution Approach 1:
The power-off setting circuit acts as an intermediary between the battery coupling detection and the power supply control. It receives the battery voltage input signal and generates a power-off control signal that prevents unintentional power-on during first coupling. This intermediary circuit preserves the detection accuracy of voltage interruption while adding the necessary information about first coupling state to prevent harmful power consumption.
Data Source
AI summary
A power supply circuit includes a charge system circuit and a discharge system circuit. The charge system circuit charges a battery based on power received by a power receiving unit. The discharge system circuit supplies power to a power supply target device based on a battery voltage from the battery. The discharge system circuit includes a power supply circuit and a power-off setting circuit. The power supply circuit supplies power to the power supply target device based on the battery voltage. The power-off setting circuit sets the power supply circuit to a power-off state when it is detected that a non-input state of the battery voltage to the discharge system circuit is changed to an input state of the battery voltage to the discharge system circuit, and releases the power-off state after the power receiving unit starts receiving power.