USB Power Switch Control to Block Standby Drain and Overvoltage
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Solution Overview
Problem
Existing electronic apparatuses that operate with power supplied from an external source via a USB interface continue to consume power even when the power source is off, leading to unnecessary energy consumption and potential damage from overvoltage conditions.
Innovation Solution
Incorporating a power switch element, a power-source supply controller, and a control unit that switches power supply states based on coupling with an external apparatus, with a power controlling switch element keeping the power switch off until manually activated, and an overvoltage detection unit to prevent power supply during abnormal conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power-source supply controller automatically starts power reception when coupling with external apparatus is established, then power supply is ensured, but power is consumed even when the power source is off
Solution Approach 1:
The power controlling switch element is configured to remain off until the power switch is operated, preventing automatic power reception. This preliminary blocking action ensures that even though the controller can negotiate power supply, the actual power flow is blocked until manual activation, thus eliminating unnecessary power consumption while maintaining the capability for power supply when needed
2Use of energy by moving object
If the power switch element remains off until manual operation, then power consumption is reduced, but automatic power supply is prevented
Solution Approach 1:
The power controlling switch element acts as an intermediary between the automatic power negotiation function and the actual power switch element. It receives the control signal from the power switch and conditions the power flow based on manual operation status, thus mediating between automated negotiation and manual activation requirements
Data Source
AI summary
An electronic apparatus includes a power switch element configured to switch on and off power supply, a power-source supply controller configured to request an external apparatus for the power supply when coupling with the external apparatus is established, and a power switch configured to switch on and off the power switch element. The power-source supply controller includes an output unit configured to switch from a first state to a second state when the coupling with the external apparatus is established. The electronic apparatus includes a power controlling switch element between the power switch element and the output unit, the power controlling switch element being configured to keep the power switch element off by remaining off until the power switch is operated when the output unit is in the second state and the power switch element is off.