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bq51013 protection features

Masaya Emi
Prodigy 690 points
Other Parts Discussed in Thread: BQ51013

Would you let me know all of the protection features of bq51013?

What is meant by "protection feature" is...

- Detect any abnormal condition by bq51013

- Send End of Transfer packet to Tx to stop power transfer.

Listed protection features in the datasheet are...

1. Thermal Protection
2. Rectifier undervoltage protection
3. Rectifier reverse voltage protection
4. TS-Bias Short circuit protection
5. Input Overvoltage protection

Are these all of protection features of bq51013?

Would you give us rough summary of features of 2, 3, and 4? (I could not find detailed explanation of 2-4)


Thanks.

  • 0
    TI__Guru* 75656 points

    The bq51013 incorporates a plethora of protection features that are traditional and unique to the wireless power receiver environment.

    I could address your concerns much better if you could narrow the scope of your question a specific protection feature.  

  • 0 in reply to Bill Johns
    TI__Prodigy 690 points

    Here is one specific question from our customer.

    Please assume a case where WPC complicant Tx controller is stuck and keep its Power Transfer regardless of End of Transfer Packet.

    Does bq51013 has features to stop transmitting power from Tx to Rx in case of failure? For example............

    A- Set AC1/AC2 high impedance so that no sine curve current will not flow through the coil.

    B- Cut off OUT so that no current/voltage is not applied to OUT pin.

    If it does any of these listet above, what happens if....

    1- Fault condition detected, End of Transfer packet sent to Tx, but the power transfer does not stop.

    2- Set EN1=EN2=1, but the power transfer does not stop.

    3- Set TS/CTRL pin voltage to send End of Power Transfer packet, but the power transfer does not stop.

    Please advise.

  • 0 in reply to Masaya Emi
    TI__Guru* 75656 points

     

     If it is a WPC compliant TX Controller then:

    • 1.) The TX must receive communications from the RX to begin power transfer
    • 2.) If communications are bad (no comm for 1.2 sec) it will stop power transfer
    • 3.) It will responded to the EPT

     

    In the highly unlikely event that the TX does not respond to an end power transfer:

          1.) When EPT is sent the RX disconnects the load, LDO is shutdown.  Only rectifier is active.

          2.) The RX controls the TX, if the TX does not set voltage to the desired point in 64 packets or about 3 sec. the load is also disconnected.

  • 0 in reply to Bill Johns
    Intellectual 840 points

    John,

    How RX side response to TX after input over voltage protection?

  • 0 in reply to MD Home
    TI__Guru* 75656 points

     

    If OVP trips the bq51013 will turn off the LDO, disconnecting the output after about 30mS (deglitch time).  

    During this time the bq51013 is sending commands to the transmitter to adjust the voltage, if the voltage does not converge on the correct values in 64 comm packets and EPT is send.  If the transmitter is not receiving comm packets from the receiver it will stop power transfer.

    Bill