Power Supply Identification Circuit for Automatic ON/OFF Control
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Solution Overview
Problem
Conventional electric devices with two kinds of power input terminals cannot automatically identify the type of power supply and control their ON/OFF states accordingly, leading to inconsistent activation and usage scenarios.
Innovation Solution
A power supply identification apparatus with first and second power terminals, an output terminal, voltage switching, and delay sections that differentiate and switch output voltages based on input signals and delay times to determine the active power supply, allowing for controlled ON/OFF states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an electric device has two kinds of power input terminals without identification capability, then the device can be connected to different power supplies, but the device cannot automatically control its ON/OFF state according to the power supply type
Solution Approach 1:
The patent introduces a power supply identification circuit as an intermediary component that detects which power terminal is connected and communicates this information to the control unit. This mediator enables the control unit to automatically determine the power supply type and accordingly control the ON/OFF state, resolving the contradiction between maintaining power supply versatility and achieving automatic control.
2Device complexity
If the device uses fixed delay times for power terminal detection, then the detection logic is simple, but the detection accuracy deteriorates when power supply connection speeds vary
Solution Approach 1:
The patent implements dynamic delay time adjustment by providing multiple delay time settings (first delay time and second delay time) that can be selected based on the detected power supply type. When AC power is detected, a first delay time is used; when DC power is detected, a second delay time is used. This dynamic adjustment optimizes detection accuracy for different power supply connection characteristics while maintaining relatively simple detection logic.
Data Source
AI summary
Provided is a power supply identification apparatus including circuitry including a first input terminal, a second input terminal and an output terminal which outputs a driving voltage to an electric device, and a power supply identification section which (i) determines from which of a first power supply and the second power supply a power is being input based on a relationship between an input timing of a first voltage to the first input terminal and a second voltage to the second input terminal, and (ii) switches the driving voltage output from the output terminal according to the power supply the power is being input from to control an initial ON/OFF state of the electric device.