Power Supply Standby Power Reduction via Auxiliary Circuit Disconnection
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Solution Overview
Problem
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 Solution
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.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
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
Solution Approach 1:
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.
2Reliability
If a separate standby power supply is used, then auxiliary circuits remain operational during standby, but device complexity and cost increase
Solution Approach 1:
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.
3Reliability
If the power factor correction controller operates in continuous mode, then stable power is provided, but standby power consumption increases
Solution Approach 1:
The patent implements burst mode operation for the power factor correction controller during standby mode, where the controller operates in periodic pulses rather than continuously. This periodic action maintains sufficient power stability for auxiliary circuits while dramatically reducing standby power consumption compared to continuous operation mode.
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 standby power consumption to less than 1 W, meeting stringent energy efficiency standards without the need for a separate standby power supply, thereby lowering costs and improving efficiency.
Implementation Method 1
a flyback transformer between the primary stage and the secondary stage
Implementation Method 2
Voltage converters can be used to generate DC voltage and/or current from an AC line voltage
Data Source
AI summary
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.