Triac Dimmer Compensation Circuit for Full Voltage Output
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Solution Overview
Problem
Conventional triac dimmer switches fail to provide full output voltage to lamps even when adjusted for full output, resulting in inefficient lighting and the need for additional or higher-rated lamps, which is costly and undesirable for lighting designers.
Innovation Solution
A compensation circuit that adjusts the current delivered to the lamp when the input voltage exceeds a threshold, ensuring the lamp receives full energy by compensating for the loss caused by the triac dimmer's inability to output full power source voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a conventional triac dimmer switch is used to vary light intensity, then the RMS voltage delivered to the lamp can be adjusted, but the dimmer cannot provide full output voltage even when set for full power output
Solution Approach 1:
The patent introduces a compensation circuit as an intermediary component between the triac dimmer and the lamp. This compensation circuit detects the actual voltage delivered by the dimmer and provides additional voltage compensation to ensure the lamp receives full rated voltage when the dimmer is set to maximum position, thereby resolving the inability of conventional triac dimmers to deliver full output voltage
Solution Approach 2:
The compensation circuit implements a feedback mechanism by continuously monitoring the voltage output from the triac dimmer and adjusting its compensation output accordingly. This feedback loop ensures that the lamp receives the correct voltage level, compensating for the inherent voltage loss in triac dimmer circuits while maintaining full power delivery capability
2Ease of operation
If the resistance of the variable resistor in the gating circuit is reduced to decrease dead time, then brighter mode is achieved, but the trigger circuit components may be damaged
Solution Approach 1:
The compensation circuit acts as a protective cushion for the trigger circuit components. By compensating for voltage issues and regulating the output, it prevents the need to operate the variable resistor at dangerously low resistance values, thereby protecting the trigger circuit components from damage while still allowing full brightness operation
3Illumination intensity
If additional lamps or higher power rating lamps are used to compensate for voltage loss, then proper illuminance can be achieved, but the cost increases
Solution Approach 1:
The patent extracts and eliminates the need for additional lamps or higher power ratings by introducing a compensation circuit that corrects the voltage delivery issue at its source. This solution addresses the root cause of insufficient light output rather than compensating through quantity or power increases, thereby avoiding additional costs
Data Source
AI summary
A circuit for dimming a lamp is provided. The circuit includes a triac dimmer that adjusts the voltage level of an input AC waveform based on the setting of a dimmer switch. The output of the dimmer is provided to a power supply circuit that drives the lamp based on the voltage level at the dimmer output. The power supply circuit includes a compensation circuit that compensates for loss of dimmer output signal caused by the triac when the dimmer switch is adjusted for full output. The compensation circuit is configured to engage at dimmer output voltage levels between full power supply voltage and a voltage threshold. The voltage threshold may be based on the dimmer output voltage level when the dimmer switch is set for full output. The compensation circuit essentially disengages to allow the lamp to dim when the dimmer output voltage level falls below the threshold.