Dummy Load Control Circuit for Triac Dimmer Compatibility
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Solution Overview
Problem
Existing control circuits for triac dimmers are complex and costly, making it difficult to adaptively control the connection and disconnection of dummy loads, leading to high standby power consumption when the triac dimmer is not present.
Innovation Solution
A dummy load control circuit using two switch circuits and a constant voltage source, with a capacitor for adaptive control, ensures the dummy load is only active when the triac dimmer is present and the AC power supply is near a zero-crossing point, disconnecting it otherwise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dummy load is always connected to the power supply input end, then the triac dimmer can receive sufficient maintained current, but the standby power consumption increases when the triac dimmer is absent
Solution Approach 1:
The patent applies dynamics by making the dummy load connection state changeable rather than fixed. The control circuit dynamically switches the dummy load between connected and disconnected states based on whether a triac dimmer is detected at the power supply input end, thereby adapting the system configuration to different operating conditions and eliminating unnecessary standby power consumption.
Solution Approach 2:
The patent implements self-service through automatic detection and control. The control circuit automatically detects the presence or absence of a triac dimmer and autonomously controls the connection or disconnection of the dummy load without requiring manual intervention, enabling the system to self-adjust and eliminate waste based on actual operating conditions.
2Adaptability or versatility
If a complex control circuit with MCU and amplifier is used to detect triac dimmer presence, then the dummy load can be controlled, but the device complexity and cost increase
Solution Approach 1:
The patent extracts and eliminates unnecessary complex components from the control circuit. Instead of using an MCU and amplifier system, the invention uses a simplified control circuit that directly detects the triac dimmer presence and controls the dummy load, removing redundant elements while retaining the essential detection and control functions.
Solution Approach 2:
The patent replaces expensive and complex components with simpler, more economical alternatives. The control circuit uses basic electronic components rather than costly MCU and amplifier assemblies, achieving the same functional outcome with significantly reduced device complexity and cost.
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 simplifies the circuit structure, reduces costs, and minimizes standby power by ensuring the dummy load is only active when necessary, maintaining normal triac dimmer operation while reducing energy consumption.
Implementation Method 1
a capacitor for adaptive control
Data Source
AI summary
The present disclosure provides a dummy load control circuit and a lighting device. The dummy load control circuit and a dummy load module are connected in parallel with a power supply input end and the dummy load control circuit includes a first switch circuit having a first switch control module so the first switch is controlled to be turned off when the power supply input end is connected to a triac dimmer, and turned on when the power supply input end is not connected to the triac dimmer, a second switch circuit having a second switch control module controlling on/off of the second switch, and a constant voltage source providing a constant voltage so the dummy load module is turned on when the first switch and the second switch are turned off, and turned off when the first switch and/or the second switch are turned on.