Power Source System Reverse Connection Protection
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Solution Overview
Problem
Existing power source systems require additional components to protect against reverse battery connections, increasing the number of parts and complexity.
Innovation Solution
A power source system with a rectifying circuit and semiconductor elements, where the number of parasitic diodes in series in the driving apparatus is greater than the number of rectifying diodes in series in the electrical generator, allowing the electrical generator to act as a voltage guard and protect the driving apparatus by melting a fuse when a reverse connection occurs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a power source relay and reverse connection protective relay are provided separately, then the driving apparatus can be protected when the battery is incorrectly connected in a reverse direction, but the number of parts is increased
Solution Approach 1:
The patent combines the power source relay and reverse connection protective relay into a single integrated circuit configuration. The power source relay includes semiconductor elements with parasitic diodes that provide both the power switching function and the reverse connection protection function, eliminating the need for a separate reverse connection protective relay.
Solution Approach 2:
The power source relay is designed to perform multiple functions: it acts as both the power source relay for controlling current flow between the battery and inverter, and simultaneously serves as the reverse connection protective relay by utilizing the parasitic diodes of its semiconductor elements to detect and protect against reverse battery connections.
2Reliability
If the number of parasitic diodes in series in the driving apparatus is made larger than the number of rectifying diodes in series in the electrical generator, then the voltage required for passing short current through the driving apparatus is larger, but this requires a specific configuration
Solution Approach 1:
The patent utilizes the parasitic diodes, which are inherently present in semiconductor elements and typically considered unwanted byproducts, as useful protective elements. By configuring the circuit so that parasitic diodes are in series during reverse connection conditions, the patent converts these parasitic elements into a protective mechanism that generates sufficient voltage to prevent damage.
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
This configuration reduces the number of components needed for protection, allowing for a more compact design while effectively preventing damage from reverse battery connections.
Implementation Method 1
a rectifying circuit configured by one or more rectifying diodes for allowing electric conduction from a ground side to a battery side
Implementation Method 2
one or more semiconductor elements having one or more parasitic diodes for allowing electrical conduction from the ground side to the battery side
Implementation Method 3
the current flowing through the electrical generator melts down the fuse so that the electrical generator and the driving apparatus are protected
Data Source
AI summary
A power source system provides: an electrical generator including a rectifying circuit configured by one or more rectifying diodes for allowing electric conduction from a ground side to a battery side; a fuse arranged between the electrical generator and a battery; and a driving apparatus including a circuit configured by one or more semiconductor elements having one or more parasitic diodes for allowing electrical conduction from the ground side to the battery side, and a load. The number of parasitic diodes to be connected in series between a ground and the fuse in the driving apparatus is larger than the number of rectifying diodes to be connected in series between the ground and the battery side in the electrical generator. In addition, the circuit switches electrical conduction in the load.