H-Bridge Short Circuit Detection Using Potential Measurement
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Solution Overview
Problem
Existing devices for detecting short circuits in H-bridges require complex routing diagrams and significant printed circuit board area, along with inefficiencies due to the use of measurement shunts in series with the input and output, which complicates the detection process and reduces power delivery efficiency.
Innovation Solution
A device that uses a printed circuit board with conductive tracks and multipin connectors to measure electrical potentials at different points, employing voltage comparators to detect short circuits without the need for measurement shunts, simplifying the routing diagram and reducing board area usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If measurement shunts are used in series with the input and output of the H-bridge to detect short circuits, then short circuit detection capability is achieved, but power delivery efficiency is reduced and device complexity increases
Solution Approach 1:
The patent extracts the measurement function from the power delivery path by measuring electrical potentials at connection zones without inserting measurement shunts in series. This removes the harmful resistance from the power path while maintaining detection capability through parallel measurement connections.
Solution Approach 2:
The patent introduces connection zones as intermediary measurement points that allow potential measurement without direct series insertion of measurement components into the power path. These intermediaries enable indirect measurement that preserves power efficiency while maintaining detection accuracy.
2Reliability
If multiple resistive elements and measurement means are used to control multiple H-bridges, then detection accuracy is maintained, but printed circuit board area and routing complexity increase significantly
Solution Approach 1:
The patent creates universal connection zones that can serve multiple H-bridges simultaneously. A single connection zone can be shared by multiple H-bridge outputs, allowing the same measurement infrastructure to monitor multiple channels without requiring separate measurement paths for each H-bridge.
Solution Approach 2:
The patent merges multiple measurement functions into shared connection zones and common reference potential points. By combining ground connections and power supply connections into shared zones, the patent reduces the total number of separate measurement paths needed while maintaining detection accuracy across multiple H-bridges.
3Reliability
If measurement shunts are inserted in series with H-bridge input and output, then short circuit detection is enabled, but the routing diagram becomes complex
Solution Approach 1:
The patent extracts the measurement function from the series power path and relocates it to parallel connection zones. This removes the need for series measurement shunts and their associated complex routing, while maintaining detection capability through potential measurement at the connection zones.
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
Enables efficient detection of short circuits in H-bridges with reduced board area requirements and improved power delivery efficiency by eliminating the need for measurement shunts, while maintaining accurate short-circuit detection capabilities.
Implementation Method 1
means for measuring two electrical potentials at two different points on said first multipin connector, as well as two electrical potentials at two different points on said second multipin connector
Implementation Method 2
processing means that are configured to detect a short circuit in the H-bridge by comparing the electrical potentials measured on the first multipin connector and on the second multipin connector, respectively
Data Source
AI summary
Disclosed is a device for detecting a short circuit of an H bridge, the device including a printed circuit including a power trace connecting the H bridge to a first connection area intended to be connected to a first multipin connector connected to a power supply terminal of a power source, and an earth trace connecting the H bridge to a second connection area intended to be connected to a second multipin connector connected to a reference terminal of the power source. The device further includes a measurement unit for measuring two potentials at two different points of the first connector, as well as two potentials at two different points of the second connector, and a processor configured to detect a short circuit of the H bridge by comparison of the potentials.