Latching Relay Power Supply Standby Leakage Reduction
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Solution Overview
Problem
Existing power supply systems, even when in standby mode, continue to consume power due to leakage currents, which is not efficiently addressed by stopping the oscillation of switching power supplies.
Innovation Solution
A power supply system incorporating a latching relay and a storage circuit that disconnects the switching power supply from the AC power supply when not in use, using a control device to determine when the storage circuit's charge has decreased to a predetermined level necessary to drive the latching relay, and reconnecting the power supply to conserve energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the switching power supply continues to be connected to the AC power supply during standby mode, then the power supply can quickly resume operation when needed, but leakage currents continue to flow and power consumption is not reduced
Solution Approach 1:
The storage circuit accumulates electric energy in advance during standby mode, and the control device monitors the charge level and activates the latching relay when the charge reaches a predetermined level. This preliminary accumulation of energy enables the switching power supply to be quickly reactivated without maintaining continuous connection to the AC power supply, thus reducing power consumption while preserving startup speed.
Solution Approach 2:
The latching relay physically disconnects the switching power supply from the AC power supply during standby mode, extracting the switching power supply from the active circuit. This disconnection eliminates leakage currents and reduces power consumption, while the storage circuit maintains sufficient charge to enable quick reconnection when needed.
2Use of energy by moving object
If the latching relay is disconnected from the AC power supply to reduce power consumption, then leakage currents are eliminated, but the storage circuit must maintain sufficient charge to drive the relay when reconnection is needed
Solution Approach 1:
The control device continuously monitors the charge level of the storage circuit and provides feedback control. When the charge reaches a predetermined level sufficient to drive the latching relay, the control device activates the relay to reconnect the switching power supply. This feedback mechanism ensures the relay is activated at the optimal moment, maintaining reliability while minimizing power consumption during standby.
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 completely interrupts AC power to the switching power supply, reducing leakage currents and power consumption, while allowing quick startup and efficient activation of the power supply when needed, thus further reducing overall power consumption.
Implementation Method 1
a switching power supply configured to convert an AC voltage from an AC power supply into a predetermined DC voltage and to output the DC voltage
Implementation Method 2
a latching relay, which is provided on an AC input line, and which is configured to switch a connection state of the switching power supply with respect to the AC power supply
Implementation Method 3
a storage circuit configured to store electricity by supply of electric power from the switching power supply
Data Source
AI summary
A power supply system includes a switching power supply for outputting a predetermined DC voltage by converting an AC voltage from an AC power supply, a latching relay provided on an AC input line for switching a connection state of the switching power supply and the AC power supply in response to a relay drive signal, a storage circuit storing electricity from the switching power supply, a control device for receiving electric power from the storage circuit in a disconnection state, and a relay drive circuit for generating the relay drive signal and outputting it to the latching relay. The control device determines whether an amount of charge of the storage circuit has decreased to a predetermined amount of charge in the disconnection state, and generates and outputs the relay control signal to the relay drive circuit.