I'm dealing with a buck converter using an ISP452, an inductor and a capacitor to act as a buck converter driven by a PWM signal coming from a microcontroller. Some part of the circuit is producing a hogh-pitch audible noise when powered, which I would like to get rid of. The circuit is driving some standard 3-pin fans. The carrier frequency of PWM signal is 3.9 Khz. I measured the output of the circuit and verified at the oscilloscope that it is a stable linear voltage. Thus the noise it is not likely coming from the fans but from the circuit itself! My first suspect goes to the inductor which is acting as a loudspeaker. Might this be possible? The question is what to do in order to remove the noise? I cannot really change the capacitor and inductor but I could try to use some "compound" that could absorbe the noise. Would this be a good choice? The ISP452 is limiting the driver PWM signal frequency to max 4 kHz. Any other suggestion?
Subscribe to:
Post Comments (Atom)
arduino - Can I use TI's cc2541 BLE as micro controller to perform operations/ processing instead of ATmega328P AU to save cost?
I am using arduino pro mini (which contains Atmega328p AU ) along with cc2541(HM-10) to process and transfer data over BLE to smartphone. I...
-
operational amplifier - What is the advantage of the inverting opamp circuit over non-inverting one?Op amp circuits are designed to achieve a specific gain regardless of the differences between individual op amps. One very common circuit ha...
-
Related question: Ceramic capacitors: how to read 3-digit markings? I have some ceramic capacitors with a 2-digit marking. How to read them?...
-
being from a CS background I am a complete noob at this. I'll keep this short. I have a couple of 18650 batteries that i salvaged from a...
-
I am imagining Linearity in the sense that F(ax+by)=aF(x) + bF(y) Now suppose I have BJT characteristic curve : In Active region, The respon...
-
Let's consider a transmission line with Perfect Electric Conductors. We know that if an external AC source is applied, we get a voltage ...
-
I have read at numerous places that NAND gate is preferred over NOR gate in industry. The reasons given online say: NAND has lesser delay th...
-
I'm having an issue with my Silicon Photomultiplier (SiPM) feedback circuit. The output is not behaving as expected. My board schematic ...
No comments:
Post a Comment