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Questions tagged [heat]

Thermal energy; where it comes from, and how to keep it from damaging components

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Does sealing low voltage high current fuse box from air exchange affect the current where the fuse blows?

I have a (Victron Energy) low voltage high current fuse box, which is intended for mega fuses such as 80A, 100A, 125A. Unfortunately, the fuse box has quite large holes where the thick cables go in, ...
juhist's user avatar
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Can heat sinks and/or heat pipes be retrofitted onto an existing electronic device?

I have a USB hub that is going into an additional enclosure that is fairly airtight. This USB hub is only rated for 0C to 40C operational, however it will need to survive hotter and colder ...
RoyGBivJr's user avatar
1 vote
2 answers
72 views

Which component is likely raising the temperature measurement on my BME680 sensor board?

I have integrated a BME680 temperature, pressure and humidity sensor on a PCB with NL27WZ17 Schmitt triggers (U3 & U4), a RT9193-33GB LDO regulator (U1) and a CM1224-04SO ESD diode (D2). I also ...
Tommy95's user avatar
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Would thermal vias under an Inductor be effective at dissipating heat?

I'm designing a BMS board that will be capable of charging my 1S2P battery back. I'll be using the 21700 Li-Ion cells, which will mean my batter pack will have a total capacity of 10000 mAh. The ...
J. Street's user avatar
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2 answers
60 views

Load sharing effect on heat dissipation [closed]

In a circuit, when two ideal components are used in parallel instead of using just one (same component in both cases), does it have any effect on any of the temperature values? junction / case / ...
kellogs's user avatar
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Heating element with SSR

I have a 3-phase, 240 V, 3 kW heating element that I intend to control via PLC ==> PWM==> SSR. In case this control methods fails electrically, how do I prevent (limit) my heating element to go ...
idir93dz's user avatar
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Weird SRAM failures when heat is applied to the system and when probed

I'm providing assistance on a project that is encountering some interesting behavior on an SRAM memory device when environmental temperature goes up or when someone probes/touches lines associated ...
Oscyzilla's user avatar
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How do I handle up to 40 Amps continuous current in an ESC (Electric Speed Controller) for my PCB? Specifically heat generation

I have an electric longboard that can consume up to 40 Amps continuously. Here is my schematic: I have a couple questions. Do both the high side and low side MOSFETs experience the same heat ...
Trev347's user avatar
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2 answers
55 views

Generic thermal resistance values for a heatsink

I am building a linear power supply, and I would like to know roughly how big my heatsinks need to be. Is there a rule of thumb for the thermal resistance of a heatsink given its dimensions and ...
Klumpy7's user avatar
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6 votes
3 answers
998 views

Cooling fan direction

I am building a temperature controller. The controller is built in a metal rack mount chassis. The components inside the controller generally consist of ACDC power supplies, an arduino and small ...
Open_Hamster3337's user avatar
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3 answers
104 views

Why is Joule heating (or electric power) proportional to current squared? [closed]

I know, that the formula P = R·I2 is derived from the formula of electric power and Ohm's Law, but the intuition behind why the current is exactly squared here is unclear to me. I get that the more ...
Andrew's Quest's user avatar
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Why does the valve symbol have a Clase symbol,or short-circyit symbol before the earth [duplicate]

Could anyone explain to me why the valve symbol have a shortcircuit symbol or termination symbol before the earth???
Daniel Prieto López's user avatar
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ENC28J60 heating issues

Here, I add the schematic and PCB layout of ENC28J60 module. It's working properly, but it's getting too hot. It's around 103 Degree Fahrenheit. How can I minimize this heating issues?
Ruman's user avatar
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2 votes
1 answer
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Trying to heat up 32-gauge nicrome wire

I was trying to heat up a nicrome wire (32gauge) using a 21650 lithium battery, and I have charged it. I have used jumper wires to connect all and joined the nicrome using wire connecting joint. The ...
Hanreet's user avatar
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1 answer
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Why didn't 10GBASE-T Ethernet replace 1000BASE-T? [closed]

1000BASE-T (gigabit Ethernet over copper twisted pair) seems to have largely replaced 100BASE-T (100-megabit Ethernet over the same medium) in new equipment. However, 10GBASE-T (10-gigabit Ethernet ...
Shivaram Lingamneni's user avatar
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1 answer
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Understanding semiconductor thermal resistance

Most datasheets I read through have a thermal resistance rating attached to the particular package the semiconductor comes in (i.e. TO-220, D2PAK, TO-3P, etc), usually in the form of θJA (junction-to-...
lemon's user avatar
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5 votes
4 answers
759 views

Thermal conductivity of 1600W/m·K?

I am comparing different thermal conductivities in the market and found that the thermal conductivity goes up to 1600W/m·K for a thermal sheet, but a thermal paste is still 0.65 W/m·K. Does it make a ...
Mhairi's user avatar
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2 votes
1 answer
665 views

Transfer function of a heating system

I wanted to design a small temperature-regulated DC heater for the sake of educational purposes in the field of control theory. The idea is to heat up a resistive element through a buck converter of ...
tampler's user avatar
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2 votes
1 answer
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Reflow oven control technique

I am developing a DIY reflow oven using a 10L common electric oven with quartz heating elements. Below is a graph that represents the oven's step response (open loop response): In blue: oven's step ...
Emanuel M's user avatar
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5 votes
1 answer
553 views

Why can domestic induction stoves heat aluminium tape, but not aluminium pans?

Domestic induction stoves can't be used with thick aluminium or copper pans, but when I try to heat aluminium tape it does get hot. Can someone explain why this is the case?
Kresna Wahyu's user avatar
6 votes
1 answer
496 views

Is it wise to determine heating element temperature from resistivity?

Context I'm making an electric furnace for melting metal, and aiming to make my own controller. Everyone seems to just use thermocouples and a control loop, I thought perhaps I could just measure the ...
TrisT's user avatar
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4 votes
1 answer
535 views

PCB as heat sink - how to calculate the area

I got an Inverter of 6 MOSFETs and I need to estimate the PCB area for keeping the junction temperature below 100 °C. The losses per FET are 0.21 W which leads to a max. Rthja = 143 K/W (junction to ...
hanss's user avatar
  • 147
0 votes
3 answers
103 views

What is this bullet-shaped part in dehydrator?

I am trying to figure out why my dehydrator stops heating after random amounts of time. My assumption is, that it is somehow related to this bullet-shaped part with a green tip, which connects the ...
Florg's user avatar
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1 vote
1 answer
234 views

What length of nichrome wire would I need to create a hand warmer to reach a max of 70°C?

The following are the details of the wire I have: Nichrom 80, 32 Gauge (0.2744 mm diameter), measured resistance 6.84 ohms/foot or 22.44 ohms/m. I'm planning on powering this only via USB so my max ...
VisuaL HippocracY's user avatar
0 votes
1 answer
223 views

How to calculate power dissipation due to heat in an amplifer like LNA?

I'm trying to calculate how much power dissipated as heat in an amplifier like LNA. Let's say a HBT device operates at 4.8 V with 80 mA operating current. Gain of the amplifier is 25 dB, OP1dB = 16 ...
Aparna B's user avatar
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1 vote
1 answer
122 views

Low power, isolated, compact 230AC to 3.3DC power supply with very low heat dissipation? [closed]

Need an isolated, compact 230V AC to 3.3V DC power supply with very low heat dissipation. No heating is extremely important as – unfortunately – this regulator will be placed enough close to a ...
Zoltán Bíró's user avatar
1 vote
2 answers
214 views

Solar Powered Bilge Pump for Pool Heater

I am planning to build a swimming pool heater, using a solar panel to drive a bilge pump which circulates pool water through 1/2" x (2 x 60) m poly irrigation tube to heat swimming pool. Solar ...
Leon's user avatar
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0 votes
1 answer
213 views

H-bridge inverter with phase shift control

I am trying to apply phase shift control to my H bridge inverter but I get these spikes in the picture I don't know why. And it getting worse if I apply inductive load
Deia Deen's user avatar
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41 views

Right-angle traces vs curvilinear traces in a PCB

In a PCB, what is the advantage of using curvilinear copper traces compared to right-angle traces? Can there be a difference in heat dissipation in a right-angle trace that has 270° of free space at ...
boromyr's user avatar
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1 answer
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Behavior of an electric stove on 1-phase vs. 3-phase

I want to replace my current electric stove that's powered by a single phase line with a 20A fuse. I'm in Germany with 230V AC. The overall power that can be delivered is 20A*230V = 4.6kW. I'm looking ...
Peter - Reinstate Monica's user avatar
0 votes
1 answer
75 views

Peltier-based liquid cooling system

I-m doing a liquid-cooling project for fun, and, well powering it and cooling the hot side seems borderline impossible. I need some help. To clarify. This is literally only to cool water, and not to ...
Александр Ананьев's user avatar
3 votes
4 answers
1k views

Power loss and heating in a diode

I'm quite confused about diodes heating when conducting electricity. I have "P1000 10A10" diode. It's supposedly rated for 10A forward current. When I've attached my lab power supply set it ...
Oxmaster's user avatar
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1 vote
0 answers
134 views

PCB heater circuit for small lithium ion battery

I'm looking to design a heating circuit for a single-cell lithium ion battery (800 mAh pouch cell) used in a unit kept outdoors in an environment that is regularly below -15 °C. This is well below the ...
Microcontroller Enjoyer's user avatar
0 votes
1 answer
214 views

STM32F407 Heating up, the decoupling capacitors showing short to ground with multimeter but microcontroller seems working fine

I have an stm32f407 which was running okay for like a month. but now i am seeing that whenever I connect power supply the current consumption is very high and the MCU is heating up a lot. The ...
Mir Hamza's user avatar
1 vote
2 answers
365 views

What is the general rule for LDO thermal considerations at various voltages?

This question isn't so much about my specific case, but rather, I'm looking for a general rule for estimating the max current that can be pulled from heatsink-less LDOs at some voltage difference. I ...
KJ7LNW's user avatar
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0 votes
3 answers
1k views

Implementing a 5 Watt, Linear Variable DC Power Supply that DOESN'T get burning hot?

The load I am trying to drive is a fan module that includes a DC cooling fan, a tachometer, some status LEDs and other temperature monitoring electronics. Historically users have swapped power ...
esologic's user avatar
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0 votes
2 answers
111 views

If you autotune a PID while the controller is live what is the worst that can happen?

I am new to using PID in studio5000. I want to autotune a heater with a CV that stays at 100, never reaching the SP but just under it. I think that might help the controller finally reach the SP. What ...
Cyange's user avatar
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0 votes
1 answer
63 views

Are heating elements multi voltage? [closed]

I have a 110 volt crock pot but I live in a 220 volt country. It says it uses 270 watts. Can I just use it anyways without modification or should I try to find the interal wiring and make the heating ...
David Hofmann's user avatar
1 vote
2 answers
99 views

Peltier linearity and equalizing control of heating and cooling directions

I need to change between heating and cooling with a Peltier, controlling this with PID. I've read a ton of information on Peltiers, looked at their datasheets and despite of this, I still cannot ...
irilinir's user avatar
0 votes
2 answers
858 views

PID control of a reversible Peltier (using Arduino PID_V2 library)

I have a box of water, which temperature I have to regulate to a ramping setpoint which could go both below and above the ambient temperature. So I have decided to use a Peltier for both cooling and ...
irilinir's user avatar
0 votes
4 answers
328 views

Thermal pad to dissipate heat to pc case

My motherboard, at the back of the CPU to be precise, is quite hot. Mine is a X99 with little over clocking. I am thinking if I use a piece of adhesive silicone pad to transfer the heat from the back ...
xxjoe's user avatar
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-1 votes
1 answer
210 views

Making a high-temp, battery-operated, heating/burning device

Crazily enough, this is not for recreational smoking use. I am trying to create a small, battery powered device, that can hit temps around 250 to 350 degrees Celsius (482 to 662 degrees Fahrenheit), ...
Greyshoes's user avatar
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0 answers
44 views

How can I compare thermal behaviour between two packages with an equivalent resistors circuit?

I want to make a thermal analysis of QFP and BGA packages for a microcontroller. I know that in terms of thermal dissipation BGA is a worse election, but I want to know how much worse it is. I don't ...
Developing Electronics's user avatar
0 votes
2 answers
362 views

Why is the power adapter external (not built in) to the monitor? [closed]

I am considering to tape this dangling box to the back of my PC monitor for easier manipulation - I carry the screen up and down every day. However, my intuition has raised a red flag. Perhaps there ...
Martin Drozdik's user avatar
6 votes
5 answers
4k views

Why are coils of wire used in heating vs a straight wire?

Attached to this you will find a picture of a bathroom heating element. I noticed that the wires that emit heat are coils. From what I understand this effectively makes them inductors. Why is an ...
Michael Bradley's user avatar
-1 votes
2 answers
104 views

Why don't microchips fail from repeated heat cycles? [closed]

Microchips can experience a pretty wide range of temperatures and they don't seem to crack or experience substantial fatigue from constant expansion and contraction. Why is this?
Aden's user avatar
  • 27
0 votes
2 answers
206 views

Fuse (I²t) ratings of copper cables

There are plenty of charts/calculators giving the maximal current for given wire section/gauge (they don't always give the same results). Those ratings are for continuous current. If there is instead ...
Sandro's user avatar
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5 votes
1 answer
377 views

What is the average length of interconnect wire that needs to be charged/discharged per floating point operation?

Problem setting I'm interested in estimating an upper bound to how many floating point operations (FLOP) can be performed per Joule of energy dissipation on existing digital CMOS hardware. To do this, ...
anson's user avatar
  • 53
2 votes
2 answers
271 views

Evaluation of the notable aspects of patent "Transistor implemented heat source" (Patent number: 10887947) [closed]

I recently came across a patent titled "Transistor implemented heat source" (Patent number: 10887947) and I'm curious to know how notable or significant this invention is in the field of ...
Emmanuel José García's user avatar
-1 votes
3 answers
64 views

How is charge limiting achieved in laptops? Why does it cause heating when limit is reached?

Laptops have this feature which allow you to limit battery charging to up to a certain percentage. Electronics wise, how is this charge limiting achieved? Is there actually a proper relay cutting off ...
everythingtrashthesedays's user avatar

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