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TPSI3050-Q1: Modifications needed for zero crossing turn off using TIDA-050058 ref design

Terry Decker
Prodigy 10 points
Part Number: TPSI3050-Q1
Other Parts Discussed in Thread: TIDA-050058

Tool/software:

Hello,

I need to design a SSR circuit that uses MOSFETs and has Zero Crossing detection.  TIDA-050058 is very close to what I need,

however, I need to also turn the relay off at the zero crossing.  Below is the spec requirement that I must meet for the AC load switch :

The output shall turn On within 10 degrees of the zero voltage point of the AC Line sinusoid on the first turn-on cycle.  All subsequent

cycles shall turn On within 5 degrees of the zero voltage point.   The output shall turn On within one half cycle following the application

of a control input signal.  The output shall turn Off within 5 degrees of the zero voltage point of the AC line sinusoid and within one half cycle following

the removal of the control input signal.

Can you provide the necessary modifications to TIDA-0050058 reference design to achieve the above functionality ?

Thanks,

  • 0
    TI__Expert 7596 points

    Hello Terry,

    Thanks for joining E2E and reaching out to our team! 

    The TIDA-050058 cannot turn off at the zero cross with how it is configured now. The detection in the off-state relies on a voltage measurement across the MOSFETs. Once the MOSFETs turn on, the voltage across becomes close to zero, and the comparator cannot detect the AC wave anymore. Will need to look into this more and let you know if we update the solution to include zero-cross turn off. It makes a lot of sense why turning off at the zero cross is important.

    Out of curiosity, what current levels are you expecting in your application?

    Best regards,
    Tilden Chen

    Solid State Relays | Applications Engineer

  • 0
    Prodigy 10 points

    The application is for 60VAC - 130VAC at 2A