Integrated Rectifier Reduces Power Losses in Automotive Generators
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing signal rectification devices using p-n diodes in generators experience significant power losses due to voltage drops, leading to inefficiencies and increased carbon dioxide emissions, particularly in large automotive generators.
Innovation Solution
A rectifying device with a power transistor and integrated rectifier control circuit on a common semiconductor die, which reduces power losses by minimizing voltage drops and eliminating the need for external control circuits, utilizing a two-terminal housing for improved thermal properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If p-n diodes are used for rectification, then rectification function is achieved, but power losses increase due to voltage drops
Solution Approach 1:
The patent merges the power transistor and rectifier control circuit onto a single semiconductor die, creating an integrated rectifying device. This integration eliminates the need for separate external control circuits while reducing power losses through optimized internal design, directly addressing the contradiction between energy efficiency and device complexity
Solution Approach 2:
The patent changes the fundamental operating parameters by using a power transistor with controllable resistance instead of a fixed p-n diode. By dynamically adjusting the resistance of the power transistor through gate control, the device achieves lower voltage drops and reduced power losses while maintaining rectification functionality
2Object-affected harmful factors
If p-n diodes are used in large automotive generators, then rectification is achieved, but carbon dioxide emissions increase due to inefficiency
Solution Approach 1:
The patent changes the electrical parameters of the rectifying device by using a power transistor with controllable on-resistance, replacing the fixed voltage drop characteristic of p-n diodes. This parameter change reduces electrical losses and improves generator efficiency, thereby reducing carbon dioxide emissions from power generation
3Device complexity
If external control circuits are used with power transistors, then rectification control is achieved, but device complexity increases
Solution Approach 1:
The patent combines the rectifier control circuit with the power transistor on the same semiconductor die, creating an integrated device. This merging eliminates external control circuit connections, reducing device complexity while maintaining reliable rectification control through internal circuit optimization
Solution Approach 2:
The integrated rectifier control circuit on the semiconductor die provides self-contained control functionality, eliminating the need for external control circuits. The device serves itself by internally managing the gate control signals, thereby reducing complexity while maintaining control reliability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution significantly reduces power losses and carbon footprint by minimizing voltage drops across the rectifying device, achieving efficient signal rectification with lower thermal and manufacturing costs.
Implementation Method 1
a power transistor (101) configured to switch between a transistor on-state and a transistor off-state
Implementation Method 2
The charge control circuit (212) may be configured to store charge provided by the alternating signal during the transistor off-state
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A rectifying device includes a power transistor and a gate control circuit and a capacitor structure arranged on a single semiconductor die. The power transistor includes a source or emitter terminal connected to a first terminal of the rectifying device, a drain or collector terminal connected to a second terminal of the rectifying device, and a gate. The gate control circuit is configured for controlling a (the) gate voltage at the gate of the power transistor based on at least one parameter relating to at least one of a voltage and a current between the first terminal and the second terminal.