Standby Power Saving Circuit Using Segmented SMPS
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Solution Overview
Problem
Existing switching mode power supplies (SMPS) continue to consume significant power in standby mode, despite efforts to reduce power consumption, as they maintain operation to supply power to electronic devices like LED illuminating devices, leading to substantial standby power usage.
Innovation Solution
A standby power saving circuit is introduced, which includes a first switching unit, voltage regulation unit, remote-control-signal receiving unit, power storage unit, comparison unit, and control unit, arranged to block power supply to the SMPS during standby mode by using a switching element between the SMPS and the power supply unit, and charges the power storage unit when necessary, minimizing standby power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the SMPS is maintained in operation state to supply power in standby mode, then the electronic device can respond quickly to user input, but the standby power consumption is high
Solution Approach 1:
The power supply system is segmented into two independent parts: a small-capacity auxiliary SMPS that remains active during standby to supply essential components, and a large-capacity main SMPS that is turned off during standby. This segmentation allows the system to maintain response readiness through the auxiliary SMPS while dramatically reducing standby power consumption by shutting down the main power-consuming component.
2Use of energy by moving object
If the switching frequency of PWM signal is reduced to lower power consumption, then the standby power is reduced, but the SMPS continues to operate at intervals consuming power continuously
Solution Approach 1:
The invention extracts and removes the main SMPS from the active power supply chain during standby mode by controlling its switching element to remain in the off state. Instead of reducing PWM frequency, the solution completely disconnects the main SMPS from power supply, eliminating continuous operation losses entirely while the auxiliary SMPS handles minimal standby power needs.
3Use of energy by moving object
If a small-capacity auxiliary SMPS is added to lower standby power of large-capacity SMPS, then the standby power is reduced, but the device complexity increases
Solution Approach 1:
The invention merges the auxiliary SMPS and main SMPS into a unified power supply architecture where both units share common components such as the rectifier circuit, control unit, and switching element structure. This merging approach allows the auxiliary SMPS to handle standby power while the main SMPS handles full power operation, reducing overall device complexity compared to completely separate power supply systems.
Data Source
AI summary
Provided is a standby power saving circuit. A switching element is arranged between a SMPS supplying power to a load and a power supply unit supplying power to the SMPS to block power supply to SMPS in a standby mode by turning off the switching element in the standby mode and to supply power to the SMPS only when an electronic device operates. In addition, a circuit supplying a power to a load and a circuit for supplying a standby power are separated, a power storage unit for supplying a driving power to the switching element is arranged inside the circuit for supplying the standby power, and if a charged power of the power storage unit is lower than a reference value, power is supplied to only the circuit for supplying the standby power, and the power storage unit is charged. Therefore it is possible to reduce a standby power.