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Thread: PWM circuits

  1. #1
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    Default PWM circuits

    Does anyone have an idea how to make a circuit between the two devices as in the picture?
    I have a PWM source which operates from 0 -2.5-5v and analog devices to the entrance between the input and GND has 5V and then output either 10V when you connect a short input and GNG have + 10v
    2.5v = 0V
    at the exit of how to do to merge these two assembly
    greeting

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  2. #2
    Registered vegipete's Avatar
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    Default Re: PWM circuits

    Some filtering turns the PWM into an analog value. Then one (or a few) op-amps can amplify, invert and offset the 0 to 5 volts to 10 to -10 volts.

    The trick though is getting a sensible output when the input is not running. If the PWM is off, what should the output voltage be, considering safe operation?



  3. #3
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    Default Re: PWM circuits

    Yes , you can use a simple RC filer on the pwm then a differential opamp to offset and double the voltage

    Quote Originally Posted by vegipete View Post
    Some filtering turns the PWM into an analog value. Then one (or a few) op-amps can amplify, invert and offset the 0 to 5 volts to 10 to -10 volts.

    The trick though is getting a sensible output when the input is not running. If the PWM is off, what should the output voltage be, considering safe operation?
    You have the PIC output a delayed enable to the amplifier to only turn it on when its stable. Thats what i do on my step2linear

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    In addition to monitoring the output state of the power circuit, PWM (Pulse Width Modulation) circuit also provides power component control signals, so it is widely used in various high-power circuits such as switching power, motor Inverter, audio for V D-polar amplifier, DC-DC converter, and UPS.



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