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Recent content by ashugtiwari

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    Using 1 shunt resistor for field oriented control of BLDC motor

    Hello All, I have been through different app notes and online theories on BLDC motor field oriented control. All of them uses per phase shunt resistor for current sensing and uses current in two phases to calculate last phase current and then use transform to convert the currents to dq vector of...
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    Coupling power transformer to ADC

    Hello All, In one of my power circuit powered through a step down power transformer converting 230V ac rms to +-5Vp-p for powering circuit ahead. I want to get the instantaneous value of AC supply through ADC sampling at higher rate to find different values. Is the circuit shown can work to...
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    [SOLVED] Transformer design for SMPS

    I used the PI expert app to find all the transformer values. But, just a small doubt. Since, before this app I did manual calculations, the operating frequency of tinyswitch-3 is 132kHz and for this frequency the ideal wire given in wire gauge chart is 27 AWG which also has current carrying...
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    [SOLVED] Transformer design for SMPS

    Hello, This is my first time making SMPS for my application, so parden my silly mistakes and questions if any. I stay in India where 230V ac rms @ 50Hz is available. I took 210V as min and 250V as max input. I need to get 5V@2A as output and using TNY266 as offline switcher for SMPS...
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    [SOLVED] Battery charge balancing circuit mosfets getting burnt

    @FvM, the driver im using is MIC4101. It is a bootstrap driver using 4.7uF of bootstrap capacitor. But, why would it not work for this situation? Please explain... Yes, it is fine with diode carrying current to prevent inductor just storing energy and go to saturation. But how did you calculate...
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    [SOLVED] Battery charge balancing circuit mosfets getting burnt

    The gate source voltage for both mosfet is 0 but with respect to ground, gate voltage for upper mosfet is around 12V and lover mosfet is 0V.
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    [SOLVED] Battery charge balancing circuit mosfets getting burnt

    Hello, I have a battery charge balancing circuit which has issue with MOSFET always getting burnt when I connect both the batteries. As from figure, if G1>G2, PWM1 is on with 12.5% duty cycle, during this time the current from G1 and input current goes through U$10 to charge G2 for balancing...
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    PIC16F1937 for PWM generation for H-Bridge control

    If you want sine modulated H-bridge circuit. Go for Half bridge connected as full bridge connections as shown in figure 23-9 in PIC16F1937 datasheet. For settings 10KHz PWM at 4MHz oscillator, set Timer2 and EPWM1 as follows unsigned char sr_10k_signal_500[] = {0, 31, 58, 80, 94, 99, 94, 80...
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    [SOLVED] BSOD on Win 10 and System reset in BIOS

    Thanks BradtheRad. The BIOS settings issue is still unknown but setting some offset voltage do solve the issue. Also, I had normal air fan cooler which i now replaced with corsair dual fan H100i v2 liquid cooler and now the temperature is not rising beyond 67 degrees even at highest overclocked...
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    [SOLVED] BSOD on Win 10 and System reset in BIOS

    Hello All, My system config is ASUS ROG MAXIMUS VII RANGER, Core i7 4970K, 16GB ram, nvidia gtx 770 2GB, 100W Corsair PSU. Im running win 10 (ver 10.0.10240) and having some blue screen errors. I have uploaded the dump file. The CPU is overheating to 100C, to see the main issue, when i see in...
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    My LG tv doesn't remember settings

    Re: My LG tv dont remember settings Usually problem can be with embedded code bug writing into memory or circuit related issue or the chip gone bad. But u cannot solve any of these issues as its completely packed TV from OEM. U can try doing manual factory reset completely, delete all data if...
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    Speed of DsPIC affected by variable types (char, int)

    dsPIC have 16 bit wide program and data bus. Any fetch for program or data fetches 16 bit data. Also, all the internal registers, ALU, MAC etc are 16 bit wide. SO, when u define int in MPLAB X, it allocates 16 bits. So, all operates ideally at max rate. Change this to 8bit and u will need...
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    Is ARM cortex - A serial von nummen or harward architecture?

    Hello All, May be silly to ask, the latest smartphones uses ARM cortex - A (Application series) SoC's which has CPU, GPU, RAM and DSP's on single die like tegra and snapdragon. Are these SoC's Von nummen or Harward architecture? or Some hybrid of them? Thanks Ashutosh
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    How does one determine the instruction set for a particular application?

    The complexity of ISA comes from complexity of the application that processor will be used for. A simple 8-bit MCU does simple control task, no processing, so a simple RISC architecture with few instructions are enough to make it. For graphics processing, the input data is always a matrix or...
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    [SOLVED] Inductor and Capacitor charging time

    Thanks FvM for answer. I know the dwell angle being fixed while dwell time changes with rpm. But as u said, with modern electronic system, dwell time is more or less constant. But this constant dwell/coil charge time changes with battery voltage and battery supplied current. That is the point i...
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