Reducing Standby Power in Solid-State Lighting Systems
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Summary
Problems
Solid state lighting systems face high power dissipation and increased costs due to the need for a separate standby power supply to maintain auxiliary circuits during standby mode, leading to inefficient power consumption.
Innovation solutions
A power supply with a two-stage AC-DC driver circuit and a flyback transformer, where auxiliary circuits are selectively enabled or disabled based on mode, and the bus voltage is adjusted to operate the power factor correction controller in burst mode, reducing power dissipation without a dedicated standby power supply.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If a separate standby power supply is used to maintain auxiliary circuits during standby mode, then the auxiliary circuits can remain operational, but the power dissipation and system cost increase
Why choose this principle:
The patent merges the standby power supply function with the main power supply circuit by utilizing the flyback transformer's bias winding to provide power to auxiliary circuits during both active and standby modes. This eliminates the need for a separate standby power supply, reducing power dissipation and system cost while maintaining auxiliary circuit operation during standby mode.
Principle concept:
If a separate standby power supply is used, then auxiliary circuits remain operational during standby, but device complexity and cost increase
Why choose this principle:
The patent combines the standby power supply functionality into the existing main power supply structure by using the flyback transformer's bias winding. This integration reduces device complexity and component count while maintaining the capability to power auxiliary circuits during standby mode, thereby lowering system cost without sacrificing reliability.
Application Domain
Data Source
AI summary:
A power supply with a two-stage AC-DC driver circuit and a flyback transformer, where auxiliary circuits are selectively enabled or disabled based on mode, and the bus voltage is adjusted to operate the power factor correction controller in burst mode, reducing power dissipation without a dedicated standby power supply.
Abstract
A power supply includes a power conversion circuit configured to selectively operate in one of an active mode in which output power is supplied to a load and a standby mode in which output power is not supplied to the load, a plurality of auxiliary circuits including a first auxiliary circuit and a second auxiliary circuit, a bias node configured to supply power to the plurality of auxiliary circuits, and a switch that is coupled between the bias node and the first auxiliary circuit and that is configured to disconnect the first auxiliary circuit from the bias node in response to a control signal.