Active Damper Circuit for Dimmer Spike Suppression
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Solution Overview
Problem
Existing dampers in rectification circuits fail to effectively prevent spikes and ringing in input voltage and current, leading to increased power consumption and temperature issues, even when using higher resistance values.
Innovation Solution
An active damper system comprising a damper resistor, a damper switch connected in parallel, and a delay circuit that delays the turn-on time of the damper switch, along with a reset circuit to manage the flow of current and voltage, allowing the damper to operate with high resistance during initial cycles to prevent spikes and ringing, and low resistance during normal cycles to minimize power consumption and temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a damper with low resistance is used, then spike and ringing are not effectively prevented, but power consumption and temperature problems occur
Solution Approach 1:
The damper resistance is made dynamic rather than fixed. The controller adjusts the damper resistance based on the operating state of the dimmer - using low resistance when the dimmer is off or in steady state, and switching to high resistance when spike or ringing is detected. This dynamic adjustment allows the system to prevent harmful effects only when necessary, reducing overall power consumption.
Solution Approach 2:
The resistance parameter of the damper is changed based on detection results. When the controller detects spike or ringing through its sensing circuit, it changes the damper resistance from low to high to effectively suppress the harmful effects. When no harmful effects are present, the resistance remains low to minimize power loss. This parameter change strategy resolves the contradiction between effective suppression and energy efficiency.
2Object-affected harmful factors
If a damper with high resistance is used, then spike and ringing are prevented, but power consumption and temperature increase remain problematic
Solution Approach 1:
The damper resistance is made dynamic rather than fixed. The controller adjusts the damper resistance based on the operating state of the dimmer - using low resistance when the dimmer is off or in steady state, and switching to high resistance when spike or ringing is detected. This dynamic adjustment allows the system to prevent harmful effects only when necessary, reducing overall power consumption.
Solution Approach 2:
The resistance parameter of the damper is changed based on detection results. When the controller detects spike or ringing through its sensing circuit, it changes the damper resistance from low to high to effectively suppress the harmful effects. When no harmful effects are present, the resistance remains low to minimize power loss. This parameter change strategy resolves the contradiction between effective suppression and energy efficiency.
3Object-affected harmful factors
If a fixed high resistance damper is used, then spike and ringing are prevented, but the system cannot adapt to different operating conditions
Solution Approach 1:
The damper resistance is made dynamic rather than fixed. The controller adjusts the damper resistance based on the operating state of the dimmer - using low resistance when the dimmer is off or in steady state, and switching to high resistance when spike or ringing is detected. This dynamic adjustment allows the system to prevent harmful effects only when necessary, reducing overall power consumption.
Solution Approach 2:
The system employs a feedback mechanism where the controller continuously monitors the circuit for spike or ringing conditions through its sensing circuit. Based on this feedback information, the controller automatically adjusts the damper resistance to the appropriate level. This closed-loop control enables the system to adapt to different operating conditions and effectively suppress harmful effects only when they occur.
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
The active damper effectively prevents spikes and ringing, reducing power consumption and temperature increases by dynamically managing resistance levels based on the cycle of the input voltage and current.
Implementation Method 1
a capacitor connected between a second end of the resistor and a second end of the damper resistor
Implementation Method 2
a diode having a cathode connected to a first end of the damper resistor and an anode connected to a gate electrode of the damper switch
Data Source
AI summary
An exemplary embodiment of the present invention relates to an active damper and a driving method thereof. An AC input passed through a dimmer is transmitted to an active damper through a rectification circuit. The active damper includes a damper resistor connected to the rectification circuit, a damper switch connected to the damper resistor in parallel, and a delay circuit delaying a turn-on time of the damper switch by a predetermined initial period from a turn-on time of the dimmer.