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205 Threads found on Insulation
Leakage for ceramics is seldom specified in the datasheets, but is basically defined from the DC operating point and the insulation resistance spec. Here is the related info from
Transformers like that fail if they overheat and the insulation between turns of wire breaks down. When they do that the result is (hopefully) a blown fuse but the chances of one producing too much voltage is almost zero. The voltage it produces SHOULD be higher than battery voltage to enable it to 'push' power into the battery so it charges but t
The voltage rating of an inductor is the maximum voltage that can be applied to the terminals without causing arc- ing or insulation breakdown. Voltage above the maximum rating may cause short circuits between turns, through the insulation, or from the windings to core or frame. Hear DLE-302U-5A is well designed to meet the high voltage requirement
Working voltage is the keyword you are looking for. There is a relation by the test voltage specifications of various safety standards. But the characterization of devices with isolation works basically the other way around. You are targeting a specific working voltage (e.g 1200 V, DC or AC, basic or reinforced insulation, possibly required to be p
Although the silicon components are generally more prone to burn, and the electrolytic capacitors are also affected in the event of any overvoltage, I would not rule out the possibility that the transformer if it is not burned, that at least had its properties changed, In the case of overheating of the insulation varnish of the windings; Just a gue
200 VA isolation transformers without enclosure are available from catalog distributors starting at about 50 EUR. Don't believe that you can make a high frequency converter with safe insulation for the same amount.
The basic misunderstanding is confusing 3000 V test voltage in the Traco data sheet with working voltage, continuously applied voltage or whatsoever. 3000 V test voltage corresponds to 1000 V working voltage in IEC1010 for basic insulation and overvoltage category I. That's much closer to IPC numbers. A additional problem is that IPC specific
First of all, this is not safe. Anyone unaware of this, could inadvertently plug some device into this connector thinking it would have 5v, and would get surprised in the worst way to find out that it has 220v. Moreover, certainly the insulation as well as the clearance of the terminals are not suited for this voltage level, neither to the electric
Does PTFE coated screws provide insulation.Like i want to insulate my PCB from chassis while mounting can i use PTFE coated screws for it.
You'll define net classes with associated design rules for minimum spacing according to required isolation voltage and minimum trace width according to rated current. Need to consider overvoltage category, environmental conditions and basic/reinforced insulation requirements.Then just route the connections.
If you want to build a transformeless voltage multiplier, assuming that components are properly suited for this potential, first of all you'll have to deal with proper component clearance as well enough insulation for avoiding leakage ionizing current flowing across the air, and not necessary to say that it become very dangerous if you do not provi
Hello, We need to wind a 3kW LLC transformer (PQ3535 bobbin) to full UK mains isolation. We want all our windings to be copper foil, the width of the bobbin. We know that the foil?s copper thickness will be 0.15mm, but how thick will the insulation be around the foil? Also, we believe that we won?t have to use margin tape as long as we can have
If you don't need provide additional electric insulation, you can work with a series regulation, by using a combination of smaller transformers instead of using a multi-derivation transformer rated with full power.
Narrowly speaking, the coating is applied for protecting various electronic products such as circuit board, glass, metal and many plastic. The coating surface has the properties of damp-proof, insulation, dust-proof, anti-corona and so on. With the development of electrical technology, electronic product deeps into every corner of daily life. The c
hello, I am looking for a cheap digital multimeter with RS 232 or USB interface.125895 be carreful with low cost RPC model !![
As for sharpness, an ordinary pin (hatpin, safety pin, needle) works for me. I keep a few in my meter case, to take readings from tiny terminals, and to puncture insulation, etc. I grasp them in crocodile clips. You want the point to be sharp enough to dig into metal a tiny bit. Otherwise if it's dull, the point slides along metal surfaces.
assuming it is a purely passive coil you are driving, to short out a magnetic wirewound coil, you would need to put a LOT of current into it so that it heated up and the insulation fried. So, have you measured the CURRENT while it is transitioning? It might be wise to put a current limiting resistor, maybe 1 ohm or so, in series with the coil
hello have you got a galvanic insulation for your AC signal ? Any link with the MAin AC power ( ground, earth,neutral) Maybe your AOP can oscille at H.F., because high speep AOP. you can reduce the Frequency band width C accross feeback
You can maybe squeeze it in there, but you will have no insulation/space safety margins.
proposal: ACS712 hall effect sensor to measure the DC current , with galvanic insulation range 0-5A , 0-20A ADC12 bits like MCP3304 4CH 12 bits for : -Amps (analog signal from ACS712) -Battery voltage -temperature LM35DZ (0-50°C) 0 -500mV use classic I2C protocole or maybe a specialized device .. see LTC family power management & other s
Do you know if there are special modules for sale which can do this for us, and spit out a voltage to say pass or failed? State-of-the-art isolation monitors (a major vendor is Bender Germany ) use a low-frequency switched voltage for reliable measurements in presence of l
(has internal 220 to 24V AC transformer is it a transfo with separate coils or an auto-transfo link bewteen primary and secondary... test insulation between input and output of transfo.. what about the earth and 0V of 5V power supply ? do you have to respect Phase and Neutral on main AC power ?
isolation means there is no direct connection with a conductor between the bits of circuitry that are isolated from each gets "degrees" of isolation, ie, that the insulation in between the two isolated bits of circuitry will not break down and conduct with say several thousand volts of potential between them....this sounds funny, but
Many time ago we used a copper wire with PVC insulation due to its ability to deal with high voltages. I'm not sure if is suited as winding transformers, but could try.
- wind pairs and reverse ends. Check out interleaved winding practices and triple insulated wire without tape insulation. Dont guess, there are books on this subject. General Advice more detail
i have managed to get the solenoids switched fromm 110vac to 24v dc much safer Anyway, the same approach above must be considered, if not so for safety purpose, at least for avoid current leakage in the event of poor insulation.
An additional care on this case at which the battery will work near to the limit of its specifications, an option that also could be considered is to oversize the capacity and add a self heating system to ensure a minimal condition to operate properly. Of course, a thermal insulation design would be required to increase the energy saving. A clas
Isnt that a nobrainer? What insulation and creepage distance do you achieve with a SO-8 chip? 1EDI family in compact SO8 package is in fact intended for 1200 V working voltage with basic rather than reinforced isolation, not meeting the 3750/5000 V test voltage requirements. Aparently there's no Infineon single channel driver offered
I would be concerned about the thermal insulation and losses in the Supercap.
What about thermal conductance, ,mass and thermal resistance of insulation and ambient?
The table & footnotes indicate they are rated for 1000 Vrms but tested for 1 minute at 3kV and as a differential pair up to 6kV. Regarding isolation tests, 1 layer of kapton with give additional to secondary from primary and is the essential added insulation barrier especially when the secondary is also grounded ( worst case stress ) HV insulat
A tungsten bulb is underpowered unless you have good insulation, but then life of bulb reduces with temperature rise of glass when enclosed, significantly, like 3000 to 300h. Or drop 50% per 10 'C rise above free air glass temp unless forced with fresh air which adds to heat loss. This is why Nichrome filament wire is used in toasters and mini
The insulation qualities of open collector transistors are defined by leakage when off and the breakdown voltage Vce(max) and are rated for voltage much higher than Vcc. Whereas CMOS drivers in MCU's are only rated to not exceed the supply rail when in tri-state mode so Sch. diode. protection must be included. Open Drain MOSFETs are also rated by
Is there a good decoupling cap placed close to the chip for analog supply? Mount on a small ground plane with insulation and connect to 0V with feedthru wires. If running serial from floating laptop, with charger, ground it to reduce SMPS charger noise. May need ferrite beads or small torroid on IO lines. Twist with ground for less stray emiss
A current leakage would be a likely situation if the insulation and internal stacking of the winding layers are not adequate. Although this level of tension is not yet the most critical, had you injected varnish on wire reel ?
You could twist the strands, , only partially strip or expose a bit to solder wet the wire ends. Solder will burn off the insulation on most magnet wire. Then solder tin the board, contact area. then solder together goes easy. Bond wire to board with adhesive such as PU fast adhesive and external where needed with snap around.
In this case, 150 VDC is actually the insulation working voltage, the voltage that's expected to be applied permanently, in constrast to the isolation voltage which is only tested for 1 minute. You find resepctive specifications in safety standards like IEC1010. The "working voltage" of a mains transformer would usually specify the rated primary
Normally one wire in the middle surrounded by a layer of plastic insulation then a shield around that. The shield is often metal foil or metal flashed plastic with a wire loosely wrapped around it. Maybe you are seeing the inner wire and the outer shield wires. Brian.
Hello, We are designing a 100w ceiling suspended led light (powered by mains psu which sits up above the ceiling). The light will have a buck dimmer circuit with it, which is obviously separate from the mains PSU. The mains PSU will be an LLC resonant converter. The suspension wires will be long so we want the output of the mains PSU to be
For every 1mm header, there's a matching 1mm socket. Generally, those small connectors are insulation-displacement types, so you'll need a tool. Furthermore, they generally are large pin counts. If you only need a few signals, why not just drop a few testpoints(vias) around the board, and solder some wires there?
hello you can expect 50mA! maxi No insulation from Mains power supply.. Hazardous circuit.. 116010
UL requires 2 wraps of insulation on the outside of the windings. Probably for safety from electrical shock.
I think if is not mentioned in the datasheet, the product already shifted the insulation material from beryllium oxide to aluminum oxide. Aluminum oxide is not toxic, but have double of thermal resistance compared to beryllium oxide, which is the best insulation thermal material.
It's no problem for the SMPS. But it means that your processor and DC output circuit must have safe insulation as if it would be connected to hot terminal of AC supply, because you can't rely on neutral being earthed. All external circuit connections, e.g. UART, programmer need opto-isolation. Using a current transformer for the AC input is prob
The multi-winding transformer has to be custom made in any case. Producing the 5 secondary windings with proper insulation is a bit demanding. Alternatively you can go for a voltage mutiplying rectifier, but it involves energy storing capacitors and has more problems to achieve fast voltage variations. As an advantage, you can use an off-the-sh
To which spec are you referring? I noticed that different specs have different assumption about the lateral (horizontal) and vertical voltage strength of inner layer insulation, resulting in different spacing rules. Apparently some specs assume that the layers may be delaminated, cancelling the effective trace encapsulation at inner layers. Similar
The main difference is the plastic outer insulation on outdoor cables is UV resistant, electrically they are identical. Performance will fall as frequency increases, you can probably use the cable up to 2GHz with reduced performance but you would need a full specification from the manufacturer to confirm that. Often they designate a cable as bein
As the primary magnetic path is in the core, it is better to have the windings as "flat" as possible. i.e. wind the secondary over the primary with a layer of mylar tape as insulation. A cylindrical windings arrangement is presumed, I believe. Windings have however non-zero thickness which involves leakage inductance. Interleavin
Signal transformer rated for high voltage transient insulation (>10kV) may be simplest solution. Also a remote differential Amp could be used powered by the DMM. Consider 100:1 gain reduction with low current. and calibrate it. DC to sensor and AC couple to meter. Make sure the divider can handle worst case line impulse voltages ( 3kV to 15
The circuit can't actually monitor insulation faults, respectively can only under the assumption of balanced motor currents. IY can be calculated as -IB-IR (for the instantaneous value, not averaged value). But the calculation is only valid if not ground current exists. In contrast, to monitor ground currents, you'll use a current sensor around