Fast Startup Switching Converter with Segmented Charging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional switching converters face challenges in minimizing startup time, which limits dimming depth in TRIAC dimming LED drivers, and existing solutions either increase power loss or require high-cost, hard-to-integrate high-voltage devices.
Innovation Solution
A switching converter design featuring three switches and a controller, where the first switch is coupled to the input, the second and third switches are controlled by the controller, and a capacitor is powered through the third switch, allowing for fast charging and efficient energy transfer to a load, with an auxiliary winding providing power during normal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the resistor R1 is reduced to minimize startup time, then the startup time is reduced, but the power loss increases and efficiency decreases
Solution Approach 1:
The patent segments the power supply establishment process into two distinct phases: a first working state where the third switch connects the capacitor to the input voltage for rapid charging, and a second working state where the third switch disconnects to eliminate power loss. This segmentation allows the system to achieve fast startup without continuous power dissipation.
Solution Approach 2:
The patent employs dynamic switching of the third switch based on the power supply voltage level. The switch is turned on during startup to enable fast charging, then turned off when the voltage reaches a threshold level, creating a dynamic response that adapts to the system's needs and eliminates unnecessary power loss during normal operation.
2Loss of time
If a high voltage switch is used to achieve fast startup and high efficiency, then the startup time is reduced and efficiency is improved, but the cost increases and integration becomes difficult
Solution Approach 1:
The patent applies local quality by assigning different voltage requirements to different switches based on their functional roles. The first and second switches operate at lower voltages during normal converter operation, while only the third switch needs to handle high voltage temporarily during startup. This allows the use of lower-voltage, easier-to-integrate switches for the majority of the circuit.
Solution Approach 2:
The patent performs preliminary action by establishing the power supply voltage through the third switch before normal operation begins. Once the capacitor is charged to the required voltage level, the third switch is turned off and the system transitions to normal operation using only the first and second switches. This preliminary charging action eliminates the need for high-voltage switches during continuous operation.
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 reduces startup time while minimizing power loss and cost, ensuring efficient operation and maintaining power supply voltage, particularly beneficial for TRIAC dimming LED drivers.
Implementation Method 1
The first capacitor has a first terminal and a second terminal, wherein the first terminal is coupled to the second terminal of the third switch and the controller to provide a power supply voltage for the controller
Implementation Method 2
The auxiliary winding of the transformer T1 provides power to the controller 101 through a diode D1
Data Source
AI summary
A fast startup switching converter having a first switch, a second switch, a third switch, a first capacitor, and a controller controlling the ON and OFF switching of the second and third switches. The first terminal of the first switch is coupled to the input terminal of the switching converter, the second terminal is coupled to the first terminal of the second switch. The first terminal of the third switch is coupled to the second terminal of the first switch and the first terminal of the second switch. The first capacitor is coupled to the second terminal of the third switch and the controller to provide a power supply voltage for the controller. The switching converter charges the first capacitor through the first and third switches in a first working state, and transfers energy to a load through the first and second switches in a second working state.