Power Delivery Switch Circuit for Low-Voltage ID Supply
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Solution Overview
Problem
The existing power delivery integrated circuits face challenges in providing a high enough supply voltage to identification circuits due to the voltage drop caused by diodes, making it difficult to meet the Power Delivery Version 3.0 specification, which requires reduced supply voltages.
Innovation Solution
A switch circuit with a first and second switch module and a logic controller is used, allowing the logic controller to optionally direct either voltage to the identification circuit, and to isolate one voltage from the other, preventing damage and ensuring a sufficient supply voltage is provided.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two face-to-face connected diodes are used to prevent power sources from damaging each other, then power source protection is achieved, but voltage drop increases (0.7V per diode)
Solution Approach 1:
The patent introduces a third terminal as an intermediary path for power delivery. Instead of relying solely on bidirectional diodes for protection, the third terminal provides an alternative route that allows power to be delivered to the cable while preventing reverse current flow, thereby reducing the voltage drop penalty of using diodes for protection.
Solution Approach 2:
The power delivery path is segmented into multiple independent paths: one path through the first diode from the first terminal, and another path through the second diode from the second terminal. This segmentation allows each diode to handle only unidirectional current flow, reducing the overall voltage drop impact compared to a single bidirectional protection path.
2Adaptability or versatility
If supply voltages are reduced to meet Power Delivery Version 3.0 specification, then power delivery compliance is achieved, but identification circuit operation becomes difficult due to insufficient voltage head-room
Solution Approach 1:
The third terminal acts as an intermediary power source that can provide voltage to the identification circuit when the main power delivery paths are constrained by low voltage requirements. This intermediary path ensures the identification circuit receives sufficient voltage for reliable operation even when compliance with Power Delivery Version 3.0 low voltage specifications is required.
Solution Approach 2:
The system dynamically selects which terminal (first, second, or third) provides power to the identification circuit based on voltage availability and operational requirements. This dynamic switching capability ensures continuous reliable operation of the identification circuit regardless of the specific voltage conditions imposed by Power Delivery Version 3.0 compliance requirements.
Data Source
AI summary
A power delivery integrated circuit is installed within a cable, and a switch circuit applied to the power delivery integrated circuit includes a first switch module, a second switch module, and a logic controller. When a first terminal of the cable receives a first voltage and a second terminal of the cable receives a second voltage, the logic controller optionally makes the first switch module transmit the first voltage to an identification circuit of the power delivery integrated circuit, or makes the second switch module transmit the second voltage to the identification circuit.