LED Dimmer controller design - Electronics engineering pulse width modulation
A dimmer is an electronic device intended to vary the power delivered to another device: lighting (stage spotlights, for example). It is therefore a power electronic device, which operates by modulating the shape of the electrical signal in order to vary the output voltage and intensity delivered to the useful device, called the load. The dimmer decreases the power delivered to the load, compared to a circuit without a dimmer. This device is used on alternating voltages (often sinusoidal): it is a direct alternating-alternating converter.
Similar devices intended for applications other than lighting (varying the speed of a motor, often) are generally called dimmers.
The dimmer can use a triac to vary the effective voltage at the output of the assembly.
For high power equipment, the dimmers can be produced by groups of thyristors mounted in anti-parallel, or possibly by thyristor-diode associations in the case of connection to polyphase networks.
A group of thyristors mounted in anti-parallel consists of two identical thyristors mounted head to tail, the anode of one being connected to the cathode of the other. One of the thyristors is responsible for controlling the positive half-waves, the other for controlling the negative half-waves. The triac is a special case of this assembly, for which the gates of the two thyristors are connected together.
LED Dimmer controller design - Electronics engineering pulse width modulation
A dimmer is an electronic device intended to vary the power delivered to another device: lighting (stage spotlights, for example). It is therefore a power electronic device, which operates by modulating the shape of the electrical signal in order to vary the output voltage and intensity delivered to the useful device, called the load. The dimmer decreases the power delivered to the load, compared to a circuit without a dimmer. This device is used on alternating voltages (often sinusoidal): it is a direct alternating-alternating converter.
Similar devices intended for applications other than lighting (varying the speed of a motor, often) are generally called dimmers.
The dimmer can use a triac to vary the effective voltage at the output of the assembly.
For high power equipment, the dimmers can be produced by groups of thyristors mounted in anti-parallel, or possibly by thyristor-diode associations in the case of connection to polyphase networks.
A group of thyristors mounted in anti-parallel consists of two identical thyristors mounted head to tail, the anode of one being connected to the cathode of the other. One of the thyristors is responsible for controlling the positive half-waves, the other for controlling the negative half-waves. The triac is a special case of this assembly, for which the gates of the two thyristors are connected together.
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