Magnetic Latching Relay Drive Circuit for Single-Port Control
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Solution Overview
Problem
Magnetic latching relays require two drive terminals for control, leading to poor compatibility with circuits designed for common electromagnetic relays, which typically use a single control terminal.
Innovation Solution
A drive circuit for magnetic latching relays that utilizes a reference voltage circuit, a capacitor, and comparison circuits to generate ON and OFF signals from a single control signal, mimicking the control logic of common electromagnetic relays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnetic latching relay uses two drive terminals for control, then the relay can achieve reliable ON and OFF states, but the compatibility with circuits designed for common electromagnetic relays deteriorates
Solution Approach 1:
The patent introduces a drive circuit as an intermediary between the control signal and the magnetic latching relay. This drive circuit includes a capacitor connected to the control signal, a reference voltage circuit, and comparison circuits that generate ON and OFF control signals. The intermediary drive circuit translates a single control signal into the two required drive terminal signals, thereby maintaining compatibility with existing single-control circuits while ensuring reliable relay operation
Solution Approach 2:
The drive circuit copies the control logic of common electromagnetic relays by using a single control terminal that generates control signals in the same manner as traditional relays. The comparison circuits replicate the simple control logic (high level for ON, low level for OFF) of electromagnetic relays, allowing the magnetic latching relay to be controlled in the same way as conventional relays without requiring changes to the control board or logic
2Measurement precision
If a magnetic latching relay requires two drive terminals, then precise control is achieved, but the device complexity increases
Solution Approach 1:
The drive circuit segments the control function by separating the generation of ON and OFF control signals into distinct comparison circuits. Each comparison circuit independently monitors the control signal and generates the appropriate control output based on voltage thresholds, achieving precise control while keeping each individual circuit segment simple and manageable
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 the magnetic latching relay to be controlled with a single control port, maintaining compatibility with circuits using common electromagnetic relays without requiring changes to the control board or logic.
Implementation Method 1
a capacitor, including a first terminal configured to receive a control signal and a second terminal configured to receive the reference voltage
Implementation Method 2
a first comparison circuit, configured to receive a voltage of the second terminal of the capacitor, compare the voltage with a first threshold voltage, and output an ON signal when the voltage of the second terminal of the capacitor is greater than the first threshold voltage
Data Source
AI summary
A drive circuit for a magnetic latching relay is provided, including a reference voltage circuit, configured to provide a reference voltage; a capacitor, including a first terminal configured to receive a control signal and a second terminal configured to receive the reference voltage; a first comparison circuit, configured to receive a voltage of the second terminal of the capacitor, compare the voltage with a first threshold voltage, and output an ON signal when the voltage of the second terminal of the capacitor is greater than the first threshold voltage; and a second comparison circuit, configured to receive a voltage of the second terminal of the capacitor, compare the voltage with a second threshold voltage, and output an OFF signal when the voltage of the second terminal of the capacitor is less than the second threshold voltage.