Single-Stage LED Power Supply Standby Mode Control
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Solution Overview
Problem
Conventional power supply devices for LED lights with a single stage structure face challenges in implementing standby mode without increasing size, leading to potential overcurrent issues and reduced lifespan due to instant voltage rise when LEDs are turned on.
Innovation Solution
A power supply device with a single stage structure that includes a switching circuit, switching control circuit, and dimming control circuit, controlled by a central control unit, allowing for standby mode operation while maintaining a specific voltage range, using a rectifier, power factor compensation circuit, and filter to manage power and noise effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standby circuit is inserted into the single stage structure, then standby mode can be implemented, but the size of the power supply device increases
Solution Approach 1:
The patent combines the standby circuit functionality with the existing single stage power supply structure by integrating the P-channel MOSFET (Q2) and its control circuitry into the same stage as the N-channel MOSFET (Q1). This merging allows the power supply to maintain standby mode capability without adding a separate second stage, thereby avoiding size increase while achieving reliable standby operation.
Solution Approach 2:
The single stage structure is designed to perform multiple functions: it can operate in full power mode when both MOSFETs are on, and in standby mode when only the N-channel MOSFET is on. The control circuit universally manages both operating modes within the same hardware configuration, eliminating the need for dedicated standby circuitry that would increase size.
2Device complexity
If a single stage structure is used without a standby circuit, then the structure is simpler and size is smaller, but overcurrent flows into the LED causing flash and reduced lifespan
Solution Approach 1:
The control circuit performs preliminary action by gradually increasing the gate voltage of the P-channel MOSFET (Q2) during startup rather than applying full voltage immediately. This gradual activation prevents instant voltage rise and overcurrent flow into the LED, avoiding flash and extending LED lifespan while maintaining the simple single stage structure.
Solution Approach 2:
The control circuit implements feedback mechanisms to monitor the operating state and adjust the gate voltages of the MOSFETs accordingly. This feedback control ensures smooth transitions between standby and full power modes, preventing overcurrent conditions that would otherwise occur in a simple single stage structure without protection circuitry.
3Device complexity
If the power supply device maintains specific voltage without standby circuit, then structure remains simple, but instant voltage rise causes overcurrent and LED flash
Solution Approach 1:
The control circuit applies preliminary anti-action by implementing a controlled startup sequence that prevents instant voltage rise. The P-channel MOSFET (Q2) is activated gradually with controlled gate voltage increase, counteracting the tendency toward instant voltage surge. This preliminary protective action eliminates overcurrent and flash hazards while keeping the overall structure simple.
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
Enables stable operation in standby mode within a specific voltage range, reducing the risk of overcurrent and extending LED lifespan by controlling power supply through proportional dimming control signals and negative feedback mechanisms.
Implementation Method 1
a rectifier configured to convert input AC power into DC power
Implementation Method 2
a filter configured to block the noise of the input AC power
Implementation Method 3
a switching circuit electrically connected to both ends of the LEDs, a switching control circuit configured to control the ON/OFF of the switching circuit
Implementation Method 4
a dimming control circuit configured to control the amount of power supplied by the power supply unit in response to the ON/OFF of the switching circuit and a dimming control signal
Implementation Method 5
a power factor compensation circuit configured to control the power factor of power received from the rectifier
Data Source
AI summary
Disclosed herein is a power supply device for an LED light. The power supply device for an LED light includes a power supply unit for converting input power and providing the converted power to LEDs and a central control unit for controlling an operation of the power supply unit. The power supply unit includes a switching circuit electrically connected to both ends of the LEDs, a switching control circuit configured to control the ON/OFF of the switching circuit, and a dimming control circuit configured to control the amount of power supplied by the power supply unit in response to the ON/OFF of the switching circuit and a dimming control signal received from the central control unit, and the central control unit provides a switching control signal for controlling the switching control circuit in response to the ON/OFF of the LEDs and provides a dimming control signal for controlling the operation of the dimming control circuit.