Rectifying Bridge Overvoltage Protection via MOS Threshold Coupling
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Solution Overview
Problem
Wireless communication devices face damage from overvoltages caused by electrostatic discharges between pads coupled to the conductive winding of their antennas, which can lead to deterioration or destruction of circuits, particularly the rectifying bridge.
Innovation Solution
A rectifying bridge design incorporating MOS transistors with associated turn-on circuits that electrically couple or isolate terminals based on voltage thresholds, preventing excessive current flow during overvoltages and ensuring efficient protection against electrostatic discharges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a rectifying bridge is used to convert received electromagnetic power into electrical power supply, then the wireless device can be powered without batteries, but the bridge becomes vulnerable to overvoltages from electrostatic discharges that can destroy the circuits
Solution Approach 1:
The protection circuits are pre-configured and connected to the pads before any overvoltage event occurs. When an electrostatic discharge happens, the protection circuit immediately activates to clamp the voltage and divert the discharge current, preventing damage to the rectifying bridge and other sensitive circuits. This preliminary preparation ensures rapid response without requiring complex real-time detection.
Solution Approach 2:
The patent introduces protection circuits as intermediary elements between the external environment (where electrostatic discharges occur) and the internal sensitive circuits (rectifying bridge, power management). These intermediary circuits absorb and dissipate the harmful overvoltage energy, protecting the core functional circuits from damage while allowing normal operation during non-overvoltage conditions.
2Reliability
If protection circuits are added to protect against overvoltages, then the reliability of the device improves, but the complexity of the rectifying bridge circuit increases
Solution Approach 1:
The protection function is segmented into separate protection circuits that are distinct from the rectifying bridge itself. Each protection circuit is independently designed and can be selectively activated based on overvoltage conditions. This segmentation allows the rectifying bridge to maintain its simple, efficient structure for normal operation while the protection circuits provide additional reliability only when needed.
Solution Approach 2:
The protection circuits are designed to be dynamically active only during overvoltage events. During normal operation, the protection circuits remain inactive or in a high-impedance state, presenting minimal interference to the rectifying bridge operation. When an overvoltage is detected, the protection circuits dynamically switch to an active state to clamp the voltage and divert current, then return to inactive state after the threat passes.
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 effectively protects wireless communication devices from overvoltages by managing current flow during electrostatic discharges, preventing damage to the rectifying bridge and maintaining normal operation in the absence of overvoltages.
Implementation Method 1
each circuit being configured to electrically couple its first and second terminals when an absolute value of a voltage between the first terminal of the circuit and the first terminal of the other circuit is greater than or equal to an absolute value of a threshold of the circuit and the voltage has the same sign as the threshold
Implementation Method 2
the power received by the antenna of the first device may be used to electrically power circuits, for example, integrated circuits, of the first device. For this purpose, the first device generally comprises a rectifying voltage bridge configured to receive a voltage available between two pads or terminals coupled to the respective ends of a conductive winding of the antenna
Implementation Method 3
each circuit comprises a branch comprising a first dipole with a diode function and a second dipole with a diode function coupled in anti-series
Data Source
AI summary
The present disclosure relates to a device including a rectifying bridge including: a branch connected between first and second nodes; another branch including first and second MOS transistors series-connected between the first and second nodes and having their sources coupled together; a resistor connecting the gate of the first transistor to the second node; another resistor connecting the gate of the second transistor and the first node; and for each transistor, a circuit including first and second terminals respectively connected to the drain and to the gate of the transistor, and being configured to electrically couple its first and second terminals when a voltage between the first terminal of the circuit and the first terminal of the other circuit is greater than a threshold of the circuit.