Questions tagged [heat]

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

Filter by
Sorted by
Tagged with
6
votes
2answers
129 views

Warming PCB in cold environment using SMD components only

I made a sensor board that needs to operate at about -55 degrees Celcius. Unfortunately, its key component often malfunctions when the circuit is cooled for days at the temperature and then powered up....
1
vote
0answers
40 views

What exactly is it that damage a GPU when overclocking? [on hold]

I want to overclock my GPU. I got a good cooling system, but I don't want to reduce the working time on my GPU. Is it the heat that damage it? If the GPU still is cold, will it work as long as a GPU ...
1
vote
2answers
43 views

Controlling heat gun's element: where to put SSR without disturbing motor

I'm working on a pet project of mine, creating a coffee roaster, where I'm using a heat gun as the heat source. To improve my control of the heat output of the gun, I've set up an Arduino to control a ...
0
votes
1answer
57 views

LF33CV voltage regulator overheating

I'm trying to turn on a laser (3.3v - 4.5v, 100mw) using a 9v battery and LF33CV as voltage regulator(TO220 package, 3.3v output). After 20 seconds the voltage regulator is getting so much hot. I was ...
-1
votes
1answer
27 views

What material characteristics are most important for heating element material selection?

I want construct a heating element by screen printing a flat coil pattern of conductive paste onto an insulated substrate. This conductive paste consists of a powder of conductive metal contained in a ...
-1
votes
1answer
41 views

Regulators lm75xx in series : 12v to 5v [duplicate]

What do you think about puting regulators lm75xx in series in order to get less heat loss as possible : 9v-- to 5v-- to 3.3v , to get 3.3v from 12v supply? The idea is to not using a switching ...
0
votes
1answer
54 views

Does melting microwires cause internal shorts

If you overheat a chip, you can melt the microwires attaching the wafer to the package. When this happens, can the melted microwires cause shorts between the pins of the chip, inside the package of ...
1
vote
2answers
57 views

Why is voltage specification irrelevant in tripping a PPTC polyswitch?

In a circuit, a resettable fuse (or polyswitch or PPTC) is a kind of breaker component that trips when the AMPERAGE exceeds a given treshold to protect against overcurrent faults. PPTC basically ...
1
vote
1answer
76 views

How can this PWM converter circuit be improved?

This circuit is intended to use a 1-10Hz PWM signal as input and produce a 1-10kHz 10A PWM output. It will be used for controlling the speed of a water pump: GP1352 The PCB will be ordered with (only) ...
1
vote
0answers
66 views

Why are there no nichrome resistor pastes?

Nichrome wire is commonly used for wire coil heating elements. Other heating elements are formed by screen printing a pattern of "resistor paste" onto a dielectric coated substrate. These pastes are ...
0
votes
1answer
42 views

Battery heating issue

In my project, we are using Li-Polymer batteries. We have LCD and high-power components which will generate heat. We have an enclosure in which battery and LCD and other hardware will be fitted. We ...
0
votes
1answer
72 views

How to power a nickel chromium wire to produce heat without burning the power adpapter

I want to build a toaster just for fun. I want to buy a nickel chromium wire to heat the toaster's plate. How to avoid burning my power adapter cuz the resistance is too low. I currently have a ...
2
votes
1answer
108 views

How did static charge ruin my control board?

We have a Thermia geothermal heat pump that was working fine up until we had a particularly bad thunderstorm. Lightning took out the power for a while and burned up a DSL modem, a router, and a IP ...
2
votes
2answers
85 views

PSU drops both current and voltage when connecting to an LED

I'm connecting a DC PSU to a high power LED. I'm setting the maximal current, and a voltage. For the first few seconds, I'm in the c.c mode (voltage drops from its initial value to a lower one). But ...
1
vote
1answer
42 views

TPA3118: coils and op-amp getting warm

I designed a simple board based upon the ds of the TPA3118. Here the actual schematic: When I power the device, even with no input signals, coils (L1..L4) and op-amps (IC1..IC2) reach a quite warm ...
0
votes
1answer
59 views

Calculating heat generated by resistance wire on 3 phase current

I am designing a heating element consisting of resistance wires coiled around a tube to heat water flowing in the tube. All three heating elements (loads) will have the same resistance and will be ...
1
vote
2answers
111 views

What to do when there is no ground cable?

I'm trying to connect a heating cable (heating tape) which is constant wattage type. This cable requires 240V. However, I realized there is no ground cable as you can see in the picture below. it only ...
10
votes
6answers
2k views

Heat output from a 200W electric radiator?

Im looking at installing an electric towel radiator. The heating element is 200W. Dose that mean that it would both : use 200W of electricity provide 200W of heat output to the room ?
1
vote
3answers
60 views

How to prevent voltage regulator board heating up and how thick traces should be?

Im designing a DC-DC voltage step down regulator based off of a switching regulator IC from texas instruments. I have designed the schematic and board accordingly and it should be able to supply 5A at ...
0
votes
1answer
29 views

Calculating electromagnet – magnetism vs heat

Im making an electromagnet that will be more or less permanently turned on so I need to avoid heating problems. I have studied this a bit and came to the conclusion that: the lower the gauge (AWG) (...
0
votes
2answers
63 views

Can a trim-pot wiper or contact point gets oxidized over time?

Can a trim-pot wiper or contact point gets oxidized over time? For example when a potential (high) current is flowing and the contact point of the wiper on the resistive element heats up a little. I ...
0
votes
2answers
74 views

How to heat an e-cigaret coil

I am working on making my own "mod" for an e-cigaret (A mod is the device that controls when and how much the coil is heated up to) I have read a lot about it during the last couple of days, so i ...
1
vote
1answer
70 views

Calculating MOSFET Heat Dissipation onto PCB

So for my Heated-Glove project, I was thinking of making a series-parallel battery circuit that is powered by the ATMega328p Microcontroller. What this circuit does is charges the batteries using two ...
2
votes
2answers
107 views

DC motor in vacuum, heat generation

I am designing a motor system that has to run in a vacuum chamber (sub mbar). I am a little bit worried about the heat that would not dissipate at all in the vacuum. Therefore, I want the least amount ...
1
vote
0answers
62 views

How to calculate MOSFET temperature increase in PCB

I want to calculate MOSFET(DATASHEET) temperature increase for PCB. MOSFET - FDD86250_F085-D Totally 13 MOSFET's will be mounted in PCB. At the same time, maximum 8 MOSFET's will be used in PCB 1, ...
1
vote
1answer
33 views

Connecting K-Type Thermocouple wires to a data logger with a male and female plug

I'm trying to setup a temperature data logger using Graphtec GL240. I will be using K-type thermocouples for the logger. I want to run short length of k type cables from the logger to a female K type ...
4
votes
4answers
5k views

Is DC heating faster than AC heating?

If I have a 120V @ 50Hz AC heater rated at 750W, and I run it using 120V DC, will the DC heat it faster, and why? (Assuming I could get a clean 120V DC power source).
1
vote
1answer
75 views

Will WS2812B overheat because of epoxy?

So I'm currently working on a standing LED lamp with WS2812B LEDs. The length will be about 1.2m with 60 LED/m. I'm planning to cover the LEDs with white epoxy to diffuse the light and have a nice ...
0
votes
1answer
48 views

Should a UPS transformer heat up on no load? [closed]

I have a ups, APC-1100BX whose transformer heats up so much that the top of the body of the UPS gets heated up too. It gets hot to the touch when there is no load. The UPS is ventilated and when the ...
1
vote
2answers
90 views

Current capacity for Kanthal wire

I was given a Ceramics Kiln that is designed for 208V and I am trying to see if there is a way I can run it at 240V. It has 6 elements made of 16AWG Kanthal APM resistance heating wire. Each element ...
6
votes
3answers
269 views

Heatsink on underside of PCB

I have prototyped some DC-DC converter modules, and they work well. However due to size, I don't have a huge amount of copper pour for them to dissipate their heat. I have used 2oz copper but the ...
3
votes
0answers
52 views

What defines the maximum primary current of a (sensor-only) current transformer?

Take the Coilcraft CS1200L for example, which states the sensed current maximum is 35 A. This limit doesn't seem to be defined by the wire size which can fit through the hole (5 mm) as you can pass > ...
2
votes
3answers
78 views

The relationship between power, heat and efficiency

I've been thinking about this conundrum. Given we use joules to move a metal block over a surface, we do work. So imagine a motor, that spins and pulls a string, moving said metal block over one ...
1
vote
0answers
19 views

Heat transfer coefficient in a Module Baseplate

Today, for example in a power IGBT module cooled by a heatsink, it has been found that the heat transfer coefficient (htc) distribution may not be uniform across the bottom surface of the module ...
1
vote
1answer
66 views

How to generate heat using a battery and a wire

If i connect the positive and the negative terminal of the battery with a wire, the wire will turn red and generate heat.This creates a short circuit.This can damage or explode the battery?Is there ...
0
votes
1answer
56 views

If I need to attach a heat sink to a planar MOSFET, to which terminal should I attach it to?

This is a newbie question on MOSFET structure. If I need a heat sink to be attached to MOSFET, it should be closer to the source of heat. Here channel is the source of heat. Hence heat sink should be ...
0
votes
0answers
37 views

Cooling Peltier Maths

I want to construct a peltier cooling system. However, I have limited mathematical skills. Can I ask how to do the maths to calculate how much temperature differential can a specific peltier cool ...
0
votes
1answer
60 views

Water-Based Heat Sink

I am trying to incorporate a TEC in a portable system. The heat from the interior of the system needs to be transfered to the exterior where it can be dissipated freely into the environment. Now, I ...
5
votes
2answers
2k views

Why is my power MOSFET heating up when on?

I'm switching a 12V 500mA resistive load (LED strip) with a IRF540 MOSFET and it's getting very hot when it's on and conducting. This confuses me as MOSFETs are ...
0
votes
0answers
25 views

Help for design simple heating circuit using Temperature controller MH1210W

I have to warm at 33-37 Celsius degree a small wood box , volume 600 x500 x800 mm placed at 25 Celsius degree. For maintain this interval 33-37 Celsius degree - I can use Temperature controller ...
1
vote
2answers
56 views

Best practices for a phenolic spacer design to facilitate heat transfer?

I am making a hand held electronic device that includes a 0.8mm phenolic spacer/electronic insulator between the PCB and the inside/bottom of the case. This spacer is made from epoxy resin and is ...
0
votes
2answers
128 views

Resistor getting hot - up to 50°C. Is it an issue of the resistor wattage or nature of the resistor?

I am using an FOD817DSD optoisolator. According to the datasheet: CTR: 300% - 600% @ 5 mA VF = 1.2 V (typical) @ If = 20 mA. We have 10 optoisolators on the PCB which is connected to some other ...
2
votes
2answers
64 views

Lithium Ion Battery and Warm Circuit Board

I’m curious if I have a legitimate concern or if I’m just being overly paranoid. I have a rechargeable Lithium-Polymer battery (prismatic shaped) rated for a max charging temperature of 45 °C. The ...
0
votes
0answers
53 views

Suggestions for improvement of a water heating control system

I have improved my heating controls circuit design and would like some feedback on how to prevent the operator from temporarily energizing the circuit when a coil is de-energized because of a loose ...
0
votes
1answer
53 views

Fuse for a heating element

I am designing PCB for a heating control system. I have planned to use PCB mountable SSR for the control the heater element. The SSR can handle maximum of 2A current and heating element not exceed ...
2
votes
3answers
153 views

Heat dissipation by convection for ICs placed upside down

I'm currently designing a PCB with a couple of fast electronic elements (600MHz ARM, DDR3 ram etc.) and I'm quite puzzled which layer should those elements be placed upon. The product will be closed ...
0
votes
1answer
108 views

Temperature Limits of an E ink Display?

I'm playing around with E-ink displays and I have a project in mind that would have to subject the display to extremely high temperatures (around 110 degrees Celsius). The display does not have to be ...
0
votes
2answers
48 views

Triac switch cause of heating

As a newbie to hardware design, I'm having some trouble picking components. I want to switch a 24V AC Solenoid valve using a triac. According to my research/experience, transistors heat up during use. ...
1
vote
3answers
144 views

Motor Voltage and Current Limit of Brushed DC Motor

What fundamentally limits the applicable voltage in a motor? From what I understand, the input to the motor is a relatively constant impedance (since speed is on the order of 100 Hz) and it is ...
6
votes
2answers
951 views

LM317 - Calculate dissipation due to voltage drop

If I use a linear voltage regulator as LM317: Input voltage = 24 V Output voltage = 5 V (so a voltage drop of 19 V) Mean load = 480 mA (peak load = 700 mA) From the datasheet, I read that maximum ...