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  • Users: bpelec
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  1. bpelec

    Inertia units conversion

    I feel as though this may have been explained before, but my searching was not successful. My apologies if I have missed the answer... I am an electrical engineer struggling with the units of inertia. I have a specification that states that the inertial load is 0.65 lb-in-sec^2. I can't think...
  2. bpelec

    What is destructive charge voltage?

    I have a specification for a 28V DC system that includes the following: ------------------------------ Insulation Resistance: - greater than 100 Mohm with 95% rel. humidity - greater than 1000 Mohm with 50% rel. humidity Dielectric strength - greater than 450 V Destructive charge voltage -...
  3. bpelec

    How to test a USB2 cable with a BERT (bit error rate tester)?

    We have what can be best described as a usb 2 cable of questionable quality. We want to use a bit error rate tester to decide whether or not this cable is up to the job of supporting high-speed USB 2 data (480 Mbit). I am aware there are other ways of checking the performance of the cable, but...
  4. bpelec

    Finding a Manufacturer's PSPICE model for an optocoupler

    We are very close to completing an OrCAD PSPICE simulation for a two-switch forward dc-dc converter, and are only missing the optocoupler. I am now looking for a manufactuer's PSPICE model of an optocoupler with a bandwidth of at least 1 Mhz. So far I have looked through National, Texas...
  5. bpelec

    What would you want to see in a specification for a dc-dc converter?

    If you were a customer, buying a custom made dc-dc converter for an application, what information would you want to see in an outline specification? By "outline specification", I mean the kind of thing that would come along with a quote, before a final system design had been agreed. I am...
  6. bpelec

    Removing spikes from low-voltage supply voltage in a dc-dc converter

    I have designed and built a 2 kW, full-bridge, dc-dc converter. As part of this conveter, I have a double-sided PCB board that contains the control/driver circuitry and the four power switches. I have three separate copper pours that each create a local ground plane for the control circuitry...
  7. bpelec

    Using a single port network anaylser to measure a differential system

    I have a single port network analyser (HP 8714B), but I need to perform a measurement on a differential system. We had planned on taking each core of the differential system, and testing it relative to the shield using a single-ended measurement. However, our system has evolved to include a...
  8. bpelec

    How do I design a Klopfenstein Taper?

    I need to impedance match between a 50 Ohm channel and a 100 Ohm channel, and the channel has a bandwith around 2 Ghz. It has been suggested to me that I use a "Klopfenstein Taper", as it is apparently a near optimum design. My understanding is that I will essentially be custom designing a...
  9. bpelec

    How do I measure bit error rate?

    I need to measure the bit error rate between the input and output of a slip-ring. The channel is rated to work up to 1.5 Ghz, so I don't need to go above this frequency. Having had a quick look at equipment that can automatically do this, and seeing the £40,000 price tag, I would like to learn...
  10. bpelec

    What sample rate to feedback output voltage in dc-dc converter

    I am designing a full-bridge dc-dc converter that will use peak current mode control and switching at 100 kHz. The control loop will have two feedback signals: the current through the primary transformer coil and the output voltage. Here's the problem... Due to the nature of the application...
  11. bpelec

    How to layout a 5 kW full-bridge converter?

    I am designing a 5 kW full-bridge dc-dc converter, switching at 100 kHz using zero-voltage switching. I am pretty sure about the components I am using, but now I need to come up with a layout that will minimise ground loops, inductances, EMI and such... I have very little experience in the area...
  12. bpelec

    Does VSWR affect Crosstalk?

    As I understand it, VSWR is a measure of how much of a signal gets reflected back to the source in a transmission line, and crosstalk is a measure of how much coupling exists between channels in a transmission line system. Is there a relationship between VSWR and crosstalk? For example, I have...
  13. bpelec

    Measuring Crosstalk

    I am trying to measure crosstalk between channels in a slip ring. Due to the assembly of the slip ring, there are 2-3m cables on each side of it, and my test signals have to go through these cables. I am using a HP 8714B Network Analyser, in transmission mode, to measure the crosstalk. I have...
  14. bpelec

    Crosstalk in slip rings

    Does anyone have any experience or expertise in ways to predict and reduce crosstalk between channels in a slip ring assembly? Thank you.
  15. bpelec

    Leakage inductance in a transformer

    I need to calculate the leakage inductances of the primary and seconday windings in a transformer, based on the geometry of the coils and core... From looking at the theory, I am thinking that it would be possible to calculate the self-induatance of each coil using the Neumann formula[1], and...
  16. bpelec

    Leakage inductance vs. self inductance

    In a transformer, is the leakage inductance of a winding equal to its self inductance?
  17. bpelec

    What are the power losses in a transformer?

    I need to design a transformer. I want to optimise my design by trying to minimise power losses. As far as possible, I want to express all the power losses in terms of the dimensions and physical properties of the transformer. From the research I have done so far, I have identified the following...
  18. bpelec

    Reluctance calculation when the cross-sectional area is not constant.

    Generally, when performing basic reluctance calculations for E-cores or I-cores, the cross sectional area is always constant over the element considered and the following equation is used: Reluctance = Length / mu * Area I need to calaculate the reluctance of a 'cake slice', where the...

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