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12V Speed Controller/Dimmer(MTP3055)2015-03-02 21:48 150Declaration:We aim to transmit more information by carrying articles . We will delete it soon, if we are involved in the problems of article content ,copyright or other problems.
This article describes 12V Speed ??Controller / Dimmer (MTP3055). The principle is very simple, very practical. The circuit components can help you understand better grasp this principle. For example, in this circuit, you can go to find and buy these components: MTP3055.
This handy circuit can be used as a speed controller for a 12V motor rated up to 5A (continuous) or as a dimmer for a 12V halogen or standard incandescent lamp rated up to 50W. It varies the power to the load (motor or lamp) using pulse width modulation (PWM) at a pulse frequency of around 220Hz.
SILICONCHIPhas produced a number of DC speed controllers over the years, the most recent being our high-power 24V 40A design featured in the March & April 2008 issues. Another very popular design is our 12V/24V 20A design featured in the June 1997 issue and we have also featured a number of reversible 12V designs.
Circuit looks like:
Figure 1 12V Speed Controller/Dimmer
For many applications though, most of these designs are over-kill and a much simpler circuit will suffice. Which is why we are presenting this basic design which uses a 7555 timer IC, a Mosfet and not much else. Being a simple design, it does not monitor motor back-EMFto provide improved speed regulation and nor does it have any fancy overload protection apart from a fuse. However, it is a very efficient circuit and the kit cost is quite low.
Figure 2 Parts Layout 12V Speed Controller Lamp Dimmer Circuit.
Figure 3 12V Motor Speed Controller Lamp Dimmer Circuit
Figure 4 12V Speed Controller/Dimmer
The circuit uses a 7555 timer (IC1) to generate variable width pulses at about 210Hz. This drives Mosfet Q3 (via transistors Q1 & Q2) to control the speed of a motor or to dim an incandescent lamp.
While the circuit can dim 12V halogen lamps, we should point out that dimming halogen lamps is very wasteful. In situations where you need dimmable 12V lamps, you will be much better off substituting 12VLEDlamps which are now readily available in standard bayonet, miniature Edison screw (MES) and MR16 halogen bases. Not only are theseLEDreplacement lamps much more efficient than halogen lamps, they do not get anywhere near as hot and will also last a great deal longer.
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