Insulation Communication Device Noise Reduction via Dynamic Standby Control
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Solution Overview
Problem
Existing insulation communication devices using magnetic couplers face issues with noise generation and arm short-circuiting when transferring edge detection signals, particularly with short pulses, leading to errors and incorrect signal output.
Innovation Solution
The proposed insulation communication device incorporates a bridge circuit with a standby signal control and pulse signal control circuit to manage current flow and pulse generation, minimizing noise and preventing arm short-circuiting by adjusting the timing of standby switches and restricting pulse signals until current returns to zero, ensuring accurate signal transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a non-detection period is provided to negate noise in the secondary coil, then noise is reduced, but the next edge detection signal may be included in the non-detection period causing detection failure
Solution Approach 1:
The patent dynamically adjusts the duration of the non-detection period based on the decay characteristics of the coil current. The non-detection period is set to expire when the coil current decays to a predetermined threshold level, rather than using a fixed duration. This dynamic adjustment ensures the non-detection period is long enough to negate noise but short enough to allow timely detection of subsequent edge detection signals.
Solution Approach 2:
The patent uses feedback from the coil current decay characteristics to determine when to end the non-detection period. The detection circuit monitors the coil current level and automatically terminates the non-detection period when the current decays to a safe threshold, creating a closed-loop control system that adapts to varying operating conditions.
2Object-affected harmful factors
If the gradient of the decreasing coil current is made smaller than the gradient of the increasing coil current, then noise component is reduced, but arm short-circuiting may occur when short pulses appear in the input signal
Solution Approach 1:
The patent applies preliminary action by providing a standby current path through a second diode and second transistor that is activated before the main current path is interrupted. When the input signal transitions, the standby path is pre-configured to prevent arm short-circuiting while the main current decays, allowing the decreasing gradient to be reduced for noise suppression without compromising reliability.
Solution Approach 2:
The patent introduces an intermediary standby current path that mediates between the main current path and the ground reference. This intermediary path, controlled by the second transistor and diode, provides a controlled discharge route for the coil current that prevents direct short-circuiting while allowing gradual current decay to reduce noise.
3Object-affected harmful factors
If the standby switch is turned off during the decrease of the coil current, then oscillatory noise is generated on the secondary side, but if turned off too late, errors occur when short pulses appear in the input signal
Solution Approach 1:
The patent uses feedback control where the standby switch turn-off timing is determined by monitoring the coil current decay to a predetermined threshold level. This feedback mechanism ensures the standby switch is turned off at the optimal moment - early enough to prevent oscillatory noise but late enough to allow short pulses to be properly detected, eliminating the need for arbitrary timing adjustments.
Solution Approach 2:
The patent changes the operational parameters of the standby switch based on the coil current state. Instead of using a fixed timing signal, the standby switch turn-off point is dynamically determined by the coil current decay characteristic, changing the switching parameter (timing) based on the physical state of the system to optimize both noise reduction and signal accuracy.
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 effectively reduces noise and prevents arm short-circuiting, enabling correct signal transfer even with short pulses, thereby improving the reliability and accuracy of the output signal.
Implementation Method 1
transmits a signal from a transmission circuit to a reception circuit by magnetic coupling between a primary coil and a secondary coil
Data Source
AI summary
An insulation communication device includes a transmission circuit having a primary coil; and a reception circuit including a secondary coil, and is configured to transmit a signal from the transmission circuit to the reception circuit by magnetic coupling between the primary coil and the secondary coil. The transmission circuit includes an edge detection circuit, a bridge circuit, a coil current information detection circuit, and a pulse signal control circuit. The reception circuit includes a first detection circuit, a second detection circuit and an output signal generation circuit.