Latching Relay Driver Circuit for Data Center Power Efficiency
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Solution Overview
Problem
Conventional power distribution units (PDUs) in data centers face inefficiencies in power consumption and in-rush current issues due to the use of standard electromechanical relays, which consume excessive power to maintain the ON or OFF state and fail to control in-rush currents effectively during power loss and recovery.
Innovation Solution
The implementation of latching relays and a driver circuit that uses tri-state GPIO pins to control the relay's ON and OFF states with pulses of current, reducing power consumption and managing in-rush currents by sequencing relay activation and deactivation, even during power loss and restoration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard electromechanical relays are used to control power delivery, then the relay can maintain ON or OFF state, but the relay consumes excessive power continuously to maintain the state
Solution Approach 1:
The patent employs latching relays that are energized with periodic pulse signals rather than continuous DC voltage. The relay coil receives pulsed current signals that toggle the relay between latched ON and latched OFF states, eliminating the need for continuous power consumption to maintain the state. The microcontroller generates these periodic pulse signals through its GPIO pins, achieving reliable state maintenance with minimal energy expenditure.
2Use of energy by stationary object
If latching relays with pulsed current control are implemented, then power consumption is reduced, but the driver circuit complexity increases
Solution Approach 1:
The patent utilizes the microcontroller's GPIO pins to perform multiple functions: generating pulsed current signals for relay control, detecting relay state through floating input configuration, and sequencing multiple relay operations. This multi-functional use of the microcontroller reduces the need for separate dedicated driver circuits, thereby limiting the increase in overall system complexity while achieving significant power consumption reduction through pulsed relay actuation.
3Productivity
If relays are activated simultaneously during power recovery, then power delivery is restored quickly, but in-rush currents trip circuit breakers
Solution Approach 1:
The patent implements a sequencing mechanism where the microcontroller activates latching relays in a predetermined sequence during power recovery rather than simultaneously. Before full power delivery is restored, the system progressively engages relays according to a pre-programmed sequence, allowing in-rush currents to be distributed and controlled over time. This preliminary sequencing action prevents circuit breaker tripping while ultimately achieving complete power delivery restoration.
4Ease of manufacture
If standard relays are used, then the system is simple to implement, but the system cannot effectively control in-rush currents during power loss and recovery
Solution Approach 1:
The patent introduces a latching relay as an intermediary device between the microcontroller and the power delivery system. This latching relay, controlled by pulsed signals from the microcontroller, serves as a mediator that can effectively manage in-rush currents during power recovery while maintaining system relative simplicity. The latching relay's ability to maintain state without continuous power and its responsiveness to pulsed control signals make it an effective intermediary for current management.
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 significantly reduces power consumption and prevents in-rush currents by maintaining relays in the desired state without continuous power usage and controlling in-rush currents through precise timing, enhancing the reliability and efficiency of power delivery in data centers.
Implementation Method 1
When the coil is energized, where current, iC, is flowing through the coil, a magnetic field produced by the coil causes the contacts to pull in and assume an ON state
Implementation Method 2
latching relay driver... producing a pulsed signal to a coil of an electromechanical, latching relay in response to the control signal
Data Source
AI summary
Methods and apparatus provide for at least one relay with contacts transitioning from: an OFF state to an ON state in response to an ON-pulse of current through a coil in a first direction; and the ON state to the OFF state in response to an OFF-pulse of current through the coil in a second, opposite direction. A driver circuit operates to produce the ON-pulse through the coil of the relay in response to a control signal commanding the ON-state of the contacts; produce the OFF-pulse of current through the coil of the relay in response to a control signal commanding the OFF-state of the contacts; and produce the OFF-pulse of current through the coil of the relay in response to a loss of operating potential across the pair of operating power nodes.