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  1. Replies
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    Closed: Re: PL2303HXD USB/RS485 interface

    and in VCP driver?
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    Closed: Re: PL2303HXD USB/RS485 interface

    another problem with prolific or FTDI is the driver can not reconnect or reopen the COM port automatically,if it disconnected by cable removal or reconnection of cable again or noise.
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    Closed: PL2303HXD USB/RS485 interface

    Is there a sch for USB/RS485 PL2303HXD interface?
    What pins of PL2303HXD used for direction control ?

    How to program PL2303HXD OTPROM? how we apply 6.5V? please help me.

    there is no data in...
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    Closed: ARM cortex M0,3,4 with HDLC controller

    Is there any ARM Cortex M0,3,4 that have HDLC controller as peripheral?

    I need a micro with internal HDLC.
  5. Closed: wiring tester (continuty, insulation mega ohm meter)

    how to design a system that can do cable or wiring tests like as contiuty check , measuring ohmic resistance(megger) and dielectric strength check.

    please help me to start.
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    Closed: Re: Protect RS485 bus from overvoltage(24V)

    no experience? no help?

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    no experience? no help?
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    Closed: Re: Protect RS485 bus from overvoltage(24V)

    PSM712 ans PSD12C are RS485 TVS,but ADM485 will fail if we apply 24V between A,B,GND.

    Is there any tested circuit ?

    There are IC from linear that is +-60VDC tolerant ,but the price is 4 times...
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    Closed: Protect RS485 bus from overvoltage(24V)

    I used PSM712 and PSD12C with 2 resettable fuses(100mA,60V) at output pins(A,B) of RS485 driver IC(ADM485) but these comabination can not protect
    driver IC from failure when high voltage (for...
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    Closed: Re: softstart after 3 phase bridge

    I know the math routine to integrate and get average of a squarewave,but my question is why I need to average ? for what purpose I should average please give your comments

    with a link or pdf if...
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    Closed: Re: softstart after 3 phase bridge

    I know how to generate a PWM using stm32f103 TIM3 and change the duty cycle in interrupt routine.

    But I do not understand what is "take average from that function" please if possible explain...
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    Closed: Re: softstart after 3 phase bridge

    I know IGBT and I used them in H bridge, I need to start a test on IGBT as softstart.
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    Closed: Re: softstart after 3 phase bridge

    After reaching 100% charge ,is there a need to PWM or make IGBT on continuously?


    If IGBT is on continuously(after softstart) when load current is zero(load draws current periodically, 2second...
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    Closed: Re: softstart after 3 phase bridge

    please give a block diagram or pdf on it.
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    Closed: Re: softstart after 3 phase bridge

    for softstart we need to turn on the SCR ,there is no need to OFF.

    But at zero current of load scr will be off.

    why we use IGBT instead of SCR for softstart?
  15. Closed: Re: 4channel 3wire RTD design

    it seems there is no single IC solutions for 4channel RTD.
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    Closed: Re: softstart after 3 phase bridge

    please give some info on using SCR on DC bus (550VDC ) for softstart and how we can keep on the scr when the load current is zero.

    sometime load is working and sometime load is not working,when...
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    Closed: softstart after 3 phase bridge

    what solutions exist for limiting the current for charging the capacitors after 3 phase diode bridge in 380Vrms 3 phase system?
    please give some pdf.

    Average DC current of inverter load is about...
  18. Closed: Re: 4channel 3wire RTD design

    I need an IC that can convert 4 RTD to 16bit digital data,RTDs are 3 wired.

    Please give IC part number that do above task.

    ad7792 can do it for 1 RTD.
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    Closed: Re: H bridge IGBT driver problem

    ok ,it works
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    Closed: Re: H bridge IGBT driver problem

    10-20khz is my IGBT drive freq.
  21. Closed: Re: 4channel 3wire RTD design

    The AD7794 is same as AD7792 but have 4 diff channels.

    But how to multiplex Iref and Vref input pins between 4 RTDs?
    I have only 5V in the circuit.
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    Closed: Re: DC DC selection for IGBT drive

    I use HCPL316J for drive IGBTs.
  23. Closed: Is there a way to use one multichannel sigma delta for design 4ch 3wire-RTD signal co

    For design single channel 3wire RTD simply we can use sigma delta ADCs like as ad7792 but for 4 channel 3 wire RTD design we need 8 current sources,
    Is there a way to use one multichannel sigma...
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    Closed: Re: DC DC selection for IGBT drive

    I want to drive 100A 1200V IGBTs at 10~20KHz spees and I want to use isolated DC/DC converter for each IGBT to drive.

    The DC/DC need to supply 2A surge current ,how I select DC/DC converters from...
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    Closed: Re: Vce sat protection in IGBTs

    I want to design a resistance seam welding,and I think LA100 will be enough, Please give some resources if I mistake.79614

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    I want to generate 50~400Hz sinewave at output of...
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