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61 Threads found on Control Heat
Undervoltage lockout being tickled by weak mains, poor socket connection or a PFC front end problem? Thermal protection toggling due to a die or board level heat issue? control loop instability? Noise issue w/ current mode control at low duty cycles is often a problem, with the turnoff edge coming close to turnon the switch "ringing (...)
In most cases, assembly houses will assemble PCB's using IPC-A-610 as a standard for quality control. In IPC-A-610, three classes are defined; Class 1 Class 2 Class 3 This standard does not define the distance between to components but defines the allowable overhang of a component. This allowable overhang de
A state machine with flip flops is simple to control these 3 states. plus Vbat present. Use a current sense R such as 75~ 100mV at max current. Use a band gap ref for controlling current , voltage and shutdown float, which is included in LM317, but using a linear regulator is very inefficient with heat sink required. Measure average (...)
" The heat-induced mechanical stress can be compensated by expansion of the elements. " Note the word CAN, not how it is to be done, or can be done or doing it this way extends the life of the module. Or due to poor quality control the life may be shortened. It seems like a good idea, allowing the various components to move about due to their
Hi all, I was considering how best to build a lithium polymer powered heating circuit. The goal is 10-20W of peak output. Known components are 1-2 lipo cells and a resistive heating coil(resistance can be varied to best suit circuit characteristics). My first thought was a PWM controlled transistor acting as a current sink to the coil. (...)
Common protection means are current limiting to protect against output shorts and overtemperature shutdown. A well designed audio amplifier shouldn't get overheated with any usual audio input. I don't believe that variable gain is an appropriate means against overload. If the user want's it pretty loud, he'll turn the volume control though. A
hi, If you had two 2K pots in Series, setting the Top pot to 0 ohms would enable the Lower pot to control from +1.25v thru ~12V. For higher than 12V operation set the Lower pot to maximum ohms and adjust the Top pot. Take care not to exceed the LM317 heat dissipation. E
Hi, i want to use power resistor to heat up a surface from (30~70 degre celsius). the area is quite small 3x3 cm and so i want to use single small power resistor and a control circuit. Can someone recommend me a power resistor for this purpose? i want to use it with a supply around 12 v from dc supply.
using variable resistor is not so efficient way to control the speed of dc is wasted in terms of heat.that's why,pwm is used as speed is controlled by duty cycle
You can control MosFET with PWM, which will control load. Best regards, Peter
I've bent plastic using a piece of brake line tubing and a heat gun, never tried NiCr as a support. That tends to get soft and elongate when you get it real hot, but presumably you will control to a lower heat than that. Still you may need a tensioner for the NiCr. You might also consider a plain steel strip, which would eat more power (...)
As I can see now, it is an AC triac dimmer with a digital control. In the data sheet it is shown that using two push-buttons you can adjust light intensity or a fan speed in 16 steps from zero to full output. You could make a similar dimmer for DC circuits using a transistor but like with resistors, there will be a heat dissipation which wastes en
Hi friends I have a 12W LED ( 12X1W ), I need a circuit to control it's light, i use this circuit but after few hours pot heat goes up and makes problem. what do you suggest to control light of 12W led with potentiometer? 93541 Regards
As u are controlling variable resistor with mcu so make it independent from other system,use a heat shrink sleave of 2inch length, a multiturn variable and small dc motor. connect dc motor with variable resistor with sleeve and control dc motor with pwm.
If you can specify the resistance or impedance of your heat electrode, then you can determine what voltage you need to apply to dissipate 1.5kW. Most likely you can use triac control AC or cycle count burst control using a ZCS triac with suitable driver.
Any suggestions to what i can use as a heat source
Dear experts, being my first time using C18 I'm not quite sure how to set the PWM to use just 8 bits of resolution. I'm going to control a heater and the 1024steps ( 10bit), data sheet procedures would hardly be noticable as heat changes.:sad: My objective is to do the whole loop at 8 bit level, TMR2, PR2 (...)
The ampere load is one factor but what also matters is how the device will be used to control current. Will it provide resistive drop (linear mode)? Or will it serve as a switch? The first case requires that it must dissipate more heat. In the second case it dissipates less heat. Propagation delay enters into the equation when we consider (...)
Personally, I would forget the idea and use standard IR LEDs. The trouble with a laser is it needs very accurate current control, just a bit too much causes permanent failure. They also get quite hot and at 1W you would need a heat sink to keep it cool. Most laser diodes have a built-in sensor to monitor the light output and it has to be conecte
First of all, you must specify the output power. Then, we can figure out the expected current draw. What is the expected current draw? Is 1.4A much much higher than the expected current draw? Which MOSFET are you using? Your MOSFET could heat up excessively due to spikes when switching off or due to incorrect gate drive