Type-C Access Circuit for Orientation Detection and Power Gating
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Solution Overview
Problem
Conventional chip-based hardware circuits for Type-C ports cannot control the on and off states of port power supply, leading to reliability issues, safety hazards, and circuit failures due to constant power supply, especially in consumer electronics.
Innovation Solution
A device access circuit comprising a first and second reset chip, a logic circuit, and a current-limiting switch, which outputs different signal levels to recognize forward or reverse connections and control power supply, replacing complex and costly MUX chips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional chip-based hardware circuits are used for Type-C ports, then the port can be constantly powered (live port), but the reliability is low and circuit failures occur due to inability to control power supply on/off states
Solution Approach 1:
The reset chips are configured to detect connection status before power supply is activated. The logic circuit receives detection signals from both reset chips and only enables power supply when proper connection is confirmed, preventing power supply to unrecognizable devices or abnormal connections.
Solution Approach 2:
The logic circuit acts as an intermediary between the reset chips and the power supply circuit. It processes detection signals from the reset chips and controls the power switch accordingly, enabling reliable power control without requiring complex integrated power management chips.
2Ease of operation
If the port is kept constantly powered, then devices can be quickly connected, but safety hazards and circuit failures occur due to uncontrolled power supply
Solution Approach 1:
The reset chips perform connection detection before power supply is enabled. This preliminary detection ensures that power is only supplied to properly connected and recognized devices, eliminating safety hazards while maintaining quick connection capability.
Solution Approach 2:
The logic circuit continuously monitors detection signals from the reset chips and dynamically controls the power supply state. This feedback mechanism ensures power is supplied only when connection status is normal, preventing safety hazards while enabling rapid connection when conditions are met.
3Measurement precision
If MUX chips are used to recognize forward or reverse connection, then connection direction can be identified, but the device complexity and cost increase
Solution Approach 1:
The connection detection function is segmented into two independent reset chips, each connected to different ports. Each reset chip independently detects connection status, and the logic circuit combines their outputs to determine forward or reverse connection, replacing the need for a single complex MUX chip.
Solution Approach 2:
The reset chips output different detection signal levels based on connection direction (forward or reverse). The logic circuit interprets these signal level combinations to accurately identify connection orientation, achieving precise measurement without complex MUX switching mechanisms.
Data Source
AI summary
The present application describes a device access circuit and a hub. The device access circuit comprises a first reset chip, a second reset chip, and a logic circuit. An input terminal of the first reset chip and an input terminal of the second reset chip are connected to ports of a device, respectively. An output terminal of the first reset chip and an output terminal of the second reset chip are connected to input terminals of the logic circuit, respectively. The first reset chip and the second reset chip are configured to output different signal levels in response to the device being either in a forward or reverse connection. The logic circuit is configured to output a high-level signal in response to the first reset chip and the second reset chip outputting different signal levels.