Power Transmission Circuit for Backflow Prevention and Efficiency
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Solution Overview
Problem
Existing electronic devices with parallel power input ports suffer from high power consumption, high temperature, and poor power supply efficiency due to serial connection of semiconductors in the power transmission path, limiting flexibility in selecting a power source for the device body.
Innovation Solution
A power transmission circuit utilizing transistors, including a first and second transmission transistor and a control circuit, which controls the transistors to turn on or off based on voltage differences between input and output terminals, preventing backflow of current and allowing flexible selection of power sources by disabling specific power transmission circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a semiconductor is serially connected to the power transmission path between each power input port and the device body to prevent current backflow, then current backflow is prevented, but power consumption increases, temperature rises, and power supply efficiency deteriorates
Solution Approach 1:
The patent changes the operational state parameters of the transmission transistor by controlling its gate voltage dynamically. When the transistor is in the on-state, it allows power transmission with low resistance; when in the off-state, it blocks current backflow. This parameter control enables the transistor to prevent backflow without maintaining high power consumption continuously
Solution Approach 2:
The patent introduces dynamic control of the transmission transistor through a control circuit that adjusts the gate voltage based on voltage comparisons between power input ports and the device body. This dynamic operation allows the transistor to switch between conducting and blocking states, preventing backflow only when necessary while minimizing power consumption during normal operation
2Reliability
If a semiconductor is serially connected to the power transmission path, then current backflow is prevented, but temperature increases and power supply efficiency deteriorates
Solution Approach 1:
The patent controls the resistance parameter of the transmission transistor dynamically by adjusting its operating state through gate voltage. When the transistor is fully on, resistance is minimized reducing heat generation; when off, resistance is maximized to block backflow. This parameter control prevents continuous heat generation while maintaining backflow prevention capability
Solution Approach 2:
The transmission transistor operates dynamically rather than continuously, switching between on and off states based on actual backflow risk. This reduces the cumulative heat generation compared to a always-on semiconductor configuration, while the control circuit ensures backflow prevention occurs when voltage conditions require it
3Reliability
If the highest voltage input power is used to power the device body, then voltage compatibility is ensured, but flexibility in power source selection is reduced
Solution Approach 1:
The patent implements dynamic voltage comparison and selection through the control circuit, which continuously monitors voltages at different power input ports and the device body. Based on real-time voltage conditions, the control circuit dynamically determines which transmission transistor to activate, enabling flexible power source selection while ensuring voltage compatibility through active control
Solution Approach 2:
The control circuit employs feedback by continuously comparing voltages between power input ports and the device body, and using this information to control the gate voltages of transmission transistors. This feedback mechanism ensures that only appropriate power sources (those with suitable voltage levels) are connected to the device body, maintaining voltage compatibility while allowing selection among multiple suitable sources
Data Source
AI summary
A power transmission circuit includes a first transmission transistor, a second transmission transistor, and a first control circuit. A first terminal of the first transmission transistor is used as a power input terminal of the power transmission circuit. A second terminal of the first transmission transistor is coupled to a first node. A control terminal of the first transmission transistor is coupled to a control node. A first terminal of the second transmission transistor is used as a power output terminal of the power transmission circuit. A second terminal of the second transmission transistor is coupled to the first node. When a voltage of the power output terminal is greater than or equal to a voltage of the power input terminal, the first control circuit outputs a first voltage to the control node, to turn off the first transmission transistor and the second transmission transistor.