Electronic Relay Clamping Unit for Stable Turn-On
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Solution Overview
Problem
Conventional electronic relay devices face instability in maintaining a turn-on state due to fluctuations in source terminal voltage, which can occur with unstable battery input, leading to unreliable relay operation.
Innovation Solution
The electronic relay device incorporates a clamping unit between the source and gate terminals of switching elements, using a clamping voltage to maintain a stable voltage difference, independent of the source terminal voltage, ensuring consistent relay operation even with disturbances like fluctuating battery voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a predetermined voltage is supplied to the gate terminals by recognizing the voltage of the source terminals, then the relay can be controlled to turn on and off, but the source terminal voltage may fluctuate with unstable battery voltage, causing the gate terminal voltage to fluctuate and preventing stable relay turn-on
Solution Approach 1:
A clamping circuit is introduced as an intermediary component between the gate terminal and source terminal. This clamping circuit includes a clamping diode connected between the gate terminal and source terminal, which clamps the voltage difference between these terminals to a predetermined value (approximately 0.7V for a standard diode). This intermediary clamping mechanism isolates the gate terminal voltage from fluctuations in source terminal voltage, ensuring stable relay operation even when battery voltage is unstable.
2Device complexity
If the source terminal voltage is used as a reference for gate terminal voltage supply, then the circuit can operate with simple voltage recognition, but the turn-on state cannot be maintained when battery voltage and motor voltage fluctuate
Solution Approach 1:
The clamping diode serves as a mediator that establishes a fixed voltage reference between the gate and source terminals. By clamping the voltage difference to a predetermined value, it provides a stable reference that is independent of battery voltage fluctuations, thereby maintaining reliable turn-on state without increasing circuit complexity.
Solution Approach 2:
The invention changes the voltage parameter relationship by introducing a fixed voltage drop across the clamping diode. Instead of relying on the variable source terminal voltage as the reference, the system now uses the clamped voltage difference (approximately 0.7V) as the stable reference, fundamentally altering how the gate terminal voltage is determined and maintained.
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 solution allows for stable maintenance of the turn-on state of the switching unit, preventing relay instability and ensuring reliable operation even with unstable battery voltage conditions.
Implementation Method 1
a clamping unit disposed between a source terminal and a gate terminal of the switching unit, and configured to constantly maintain a voltage between the source terminal and the gate terminal in an on state of the switching unit
Data Source
AI summary
An electronic relay device includes a controller configured to receive a signal from an MCU, and output an on/off control signal for switching driving; a charging unit configured to provide a driving voltage for driving a switch, in response to the control signal of the controller; the switch including first and second switching elements which supply power to a load by being on/off-controlled in response to the driving voltage from the charging unit, source terminals of the first and second switching elements being connected with each other and gate terminals of the first and second switching elements being connected with each other; and a clamping unit disposed between a source terminal and a gate terminal of the switch, and configured to constantly maintain a voltage between the source terminal and the gate terminal in an on state of the switch.