RF_Exposure_for_WPT

FCC ID: 2AQZ8CTVK08

RF Exposure Info

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FCCID_4409993

SHENZHEN LCS COMPLIANCE TESTING LABORATORY LTD.                     FCC ID: 2AGZ8CTVKO8            Report No.:LCS190704052AEA



                                       RF Exposure Evaluation Report

   1.     Product Information


        FCC ID:                                        2AQZBCTVKO8
        Product Name                                   Automatic Car Mount Wireless Charger
        Model Number                                   CTVKO8
                                                       Input: DC SV=== 2A, 12V=== 1.5A
        Power Supply
                                                       Output : 15W (Max)
        Modulation Type                                MSK
        Frequency Range                                110.0 — 205.0 KHz
        Operation Frequency                            160.0 KHz

        Antenna Type                                   Coil Antenna
        Hardware version                               v1.0
        Software version                               v1.0
        Accessories                                    iPhone 8 Plus
        Exposure category                              General population/uncontrolled environment
        EUT Type                                       Production Unit
        Device Type                                    Mobile Device


   2.     Evaluation Method

          Per KDB 680106 DO1 Section 3. RF Exposure Requirements;

   1)     Consumer wireless power transfer devices approved under Part 18 in some cases have to demonstrate
          compliance with RF exposure requirements. The potential for exposure must be assessed according to
          the operating configurations of the wireless system and the exposure conditions of users and
          bystanders. RF exposure must be evaluated with the client device(s) being charged by the primary at
          maximum output power. The RF exposure requirements must be determined in conjunction with the
          device operating characteristics, according to the mobile and portable exposure requirements in
          Section 2.1091 and Section 2.1093 of the rules. SAR and MPE limits do not cover the frequency range
          for wireless power transfer applications which operate below 100 kHz and 300 kHz respectively;
          therefore, RF exposure compliance needs to be determined with respect to 1.1307 (c) and (d) of the
          FCC rules.
   2)     Based on the design and implementation of the power transfer application, it must be clearly identified
          if mobile or portable RF exposure conditions apply. Devices that are installed to provide separation of
          at least 20 cm from users and bystanders may qualify for mobile exposure conditions. For some
          conditions where users and bystanders may be exposed at closer than 20 cm, section 2.1091(d) (4) of
          the rules may apply.
   3)     For devices designed for typical desktop applications, such a wireless charging pads, RF exposure
          evaluation should be conducted assuming a user separation distance of 15 cm. E and H field strength
          measurements or numerical modeling may be used to demonstrate compliance. Measurements should
          be made from all sides and the top ofthe primary/client pair, with the 15 cm measured from the
          center of the probel(s) to the edge of the device. Emissions between 100 kHz to 300 kHz should be
          assessed versus the limits at 300 kHz in Table 1 of Section 1.1310: 614 V/m and 1.63 A/m. A KDB
          inquiry is required to determine the applicable exposure limits below 100 kHz.
   4)     Portable exposure conditions from 100 kHz to 6 GHz are determined with respect to SAR requirements.
          Existing SAR systems and test procedures are generally intended for measurements above 100 MHz.



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SHENZHEN LCS COMPLIANCE TESTING LABORATORY LTD. FCC ID: 2APU2CTVK08                                 Report No.: LCS190704024AEA

        While numerical modeling can be an alternative, the constraints of substantial computational
        resources at low frequencies could introduce further limitations. Under these circumstances, including
        operations below 100 kHz, the Commission may consider a combination of analytical analysis, field
        strength, radiated and conducted power measurements, in conjunction with some limited numerical
        modeling to assess compliance.
   5) Depending on the operating frequency, existing SAR and MPE measurement procedures may be
      adapted to evaluate wireless power transfer devices for compliance with respect to mobile or portable
      exposure conditions. If the grantee or its test lab have any questions regarding RF exposure evaluation
      they should contact the FCC Laboratory with sufficient system operating configuration details to
      determine if RF exposure evaluation is necessary and, if required, how to apply specific test procedures.
      Below 100 MHz, when SAR testing is required and the device is operating at close proximity to persons,
      information on device design, implementation, operating configurations, exposure conditions of users
      and bystanders are needed to determine the evaluation and testing requirements. In addition, the
      influence of nearby objects may also need consideration according to the wireless power transfer
      system implementation; for example, the effects of placing the device, its coils or radiating elements
      on or near metallic surfaces
   6) According to April 2018 TCB Workshop, No need to report E-field measurements. Only H-field required.


   3. Evaluation Limit

   3.1 Refer Evaluation Method

        ANSI C95.1–1999: IEEE Standard for Safety Levels with Respect to Human Exposure to Radio Frequency
        Electromagnetic Fields, 3 kHz to 300 GHz.
        FCC KDB publication 680106 D01 RF Exposure Wireless Charging Apps v03: RF Exposure Considerations
        for Low Power Consumer Wireless Power Transfer Applications
        FCC CFR 47 part1 1.1310: Radiofrequency radiation exposure limits.
        FCC CFR 47 part2 2.1091: Radiofrequency radiation exposure evaluation: mobile devices
        FCC CFR 47 part 18.107:Indusial, Scientific, and Medical Equipment


   3.2 Limit

          Limits for Maximum Permissible Exposure (MPE)/Controlled Exposure
                 Frequency               Electric Field           Magnetic Field            Power Density            Averaging Time
                Range(MHz)              Strength(V/m)             Strength(A/m)               (mW/cm²)                  (minute)
                                                Limits for Occupational/Controlled Exposure
                   0.3-3.0                     614                      1.63                      *100                        6
                   3.0-30                    1842/f                    4.89/f                   *900/f2                       6
                   30-300                     61.4                      0.163                      1.0                        6
                 300-1,500                      /                         /                      f/300                        6
               1,500-100,000                    /                         /                         5                         6




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SHENZHEN LCS COMPLIANCE TESTING LABORATORY LTD. FCC ID: 2APU2CTVK08                                 Report No.: LCS190704024AEA


          Limits for Maximum Permissible Exposure (MPE)/Uncontrolled Exposure
                 Frequency               Electric Field           Magnetic Field            Power Density            Averaging Time
                Range(MHz)              Strength(V/m)             Strength(A/m)               (mW/cm²)                  (minute)
                                           Limits for General Population/Uncontrolled Exposure
                  0.3-1.34                     614                      1.63                      *100                         30
                   1.34-30                    824/f                    2.19/f                    *180/f   2
                                                                                                                               30
                   30-300                     27.5                      0.073                      0.2                         30
                 300-1,500                      /                         /                      f/1500                        30
               1,500-100,000                    /                         /                        1.0                         30

          F=frequency in MHz
          *=Plane-wave equivalent power density

          According to FCC KDB 680106 D01 Section 3. RF Exposure Requirements clause 3 the Emission-Limits
          in the frequency range from 100 KHz to 300 KHz should be assessed versus the limits at 300 KHz in
          Table 1 of CFR 47 – Section1.310 as following (measured distance shall be 15cm from the center of
          the probe to the edge of the device):
                                                      E-filed                          H-filed                         B-filed
                   Frequency                           V/m                              A/m                               uT
              0.3 MHz – 3.0 MHz                         614                            1.613                             2.0
              3.0 MHz – 30 MHz                 824/f (=27.530MHz)               2.19/f (=0.07330MHz)                      --

          A KDB inquire was required to determine/confirm the applicable limits below 100 KHz.


   4. Test Setup Diagram




          For mobile RF exposure condition, due to installation limitations no tests from the underside of the
          charging device are required.


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SHENZHEN LCS COMPLIANCE TESTING LABORATORY LTD. FCC ID: 2APU2CTVK08                                 Report No.: LCS190704024AEA



   5. Test Equipment

               Equipment             Manufacturer          Model        Serial no.      Calibrated date        Calibrated Due
       Exposure Level Tester              Narda           ELT-400         N-0713          2019-04-01             2020-04-01
              B-Field Probe               Narda           ELT-400        M-1154           2019-04-10             2020-04-09


   6. Uncertainties
        The probe uncertainties stated by the manufacturers are considered to be the main relevant and dominant
        issues.

        6.1. Typical uncertainty of ELT-400
        The uncertainties stated in this document have been determined according to user manual.
        They were estimated as expanded uncertainty obtained multiplying the standard by the coverage factor k=2.
        Corresponding to a confidence level of about 95%.
        The total uncertainty of the probe derived from typical contributions of linearity, anisotropy, frequency
        response, temperature, relative humidity and with/without contribution of uncertainty of calibration.


                                                                                       Total expanded uncertainty (k=2)
                                                                            Without contribution of            With contribution of
              Magnetic probe (1)            Magnetic flux density
                                                                           uncertainty of calibration            uncertainty of
                                                                                      (%)                       calibration UT (%)
                                              0.1 uT to < 0.3 uT                        4.1                             4.2 (2)
                                              0.3 uT to < 10.0 uT                       3.3                             3.5 (2)
              Frequency at 50 Hz
                                              10 uT to < 100 uT                         3.7                             4.3 (3)
                                               100 uT to 500 uT                         4.1                             4.8 (4)
         Frequency from 40 to 10                0.1 uT to 0.3 uT                        6.5                             6.7 (5)
                  kHz                          0.3 uT to 10.0 uT                        6.1                             6.3 (5)
        (1)    The temperature range is from -10 degree to 23 degree and relative humidity is from 20% to 50%
        (2)    (5) The uncertainty or calibrated used is 1.5%
        (3)    The uncertainty of calibration used is 2.0%
        (4)    The uncertainty of calibration used is 2.7%


                                                                                       Total expanded uncertainty (k=2)
                                                                            Without contribution of            With contribution of
               Electric probe (6)         Electric frequency range
                                                                           uncertainty of calibration            uncertainty of
                                                                                      (%)                       calibration UT (%)
                                              10 V/m to 500 V/m                         7.8                             8.2 (7)
              Frequency at 50 Hz
                                            10 V/m to < 100 kV/m                        8.4                             8.8 (8)
         Frequency from 40 to 10
                                            10 V/m to < 500 V/m                         9.5                            9.9   (9)
                  kHz
        (6) The temperature range is from -10 degree to 23 degree and relative humidity from 20% to 50%
        (7) The uncertainty of calibration used is 2.0%
        (8) The uncertainty of calibration used is 2.5%


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SHENZHEN LCS COMPLIANCE TESTING LABORATORY LTD. FCC ID: 2APU2CTVK08                                 Report No.: LCS190704024AEA



   7. Measurement Procedure

          a) The RF exposure test was performed on 360 degree turn table in anechoic chamber.
          b) The measurement probe was placed at test distance (15cm) which is between the edge of the
          charger and the geometric center of probe.
          c) The turn table was rotated 360d degree to search of highest strength.
          d) The highest emission level was recorded and compared with limit as soon as measurement of each
          points(A, B, C, D, E) were completed.
          e) The EUT were measured according to the dictates of KDB 680106D01v03.


   8. Equipment Approval Considerations

          The EUT does comply with item 5.2 of KDB 680106 D01v02 as follows table;
    Requirements of KDB 680106 D01                                   Yes / No       Description
                                                                                    The device operate in the frequency
    Power transfer frequency is less than 1 MHz                      Yes
                                                                                    range 110.0 KHz - 205.0 KHz
    Output power from each primary coil is less than 15                             The maximum output power of the
                                                                     Yes
    watts                                                                           primary coil is 15W.
    The transfer system includes only single primary
    and secondary coils. This includes charging systems
                                                                                    The transfer system includes single coil
    that may have multiple primary coils and clients                 Yes
                                                                                    that is able to detect receiver device.
    that are able to detect and allow coupling only
    between individual pairs of coils.
    Client device is placed directly in contact with the                            Client device is placed directly in
                                                                     Yes
    transmitter.                                                                    contact with the transmitter.
    Mobile exposure conditions only (portable
    exposure conditions are not covered by this                      Yes            Mobile exposure conditions only
    exclusion).
                                                                                    The aggregate H-field strengths at 15
    The aggregate H-field strengths at 15 cm
                                                                                    cm surrounding the device and 20 cm
    surrounding the device and 20 cm above the top
                                                                     Yes            above the top surface from all
    surface from all simultaneous transmitting coils are
                                                                                    simultaneous transmitting coils are less
    demonstrated to be less than 50% of the MPE limit.
                                                                                    than 50% the MPE limit.

          In all other cases, unless excluded above, an RF exposure evaluation report must be reviewed and
          accepted through a KDB or PBA inquiry to enable authorization of the equipment. When evaluation is
          required to show compliance; for example, using field strength, power density, SAR measurements or
          computational modeling etc., the specific authorization requirements will be determined based on
          the results of the RF exposure evaluation.




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SHENZHEN LCS COMPLIANCE TESTING LABORATORY LTD. FCC ID: 2APU2CTVK08                                 Report No.: LCS190704024AEA



    9. E and H field Strength

      Test Modes:
      TM1        Car Charger (12V/1.5A) + EUT + Mobile Phone iPhone 8 Plus (Battery Status: <1%)                     Record
      TM2        Car Charger (12V/1.5A) + EUT + Mobile Phone iPhone 8 Plus (Battery Status: <50%) Pre-tested
      TM3        Car Charger (12V/1.5A) + EUT + Mobile Phone iPhone 8 Plus (Battery Status: 100%) Pre-tested
      TM4        Car Charger (5V/3A) + EUT + Mobile Phone iPhone 8 Plus (Battery Status: <1%)                        Pre-tested
      TM5        Car Charger (5V/3A) + EUT + Mobile Phone iPhone 8 Plus (Battery Status: <50%)                       Pre-tested
      TM6        Car Charger (5V/3A) + EUT + Mobile Phone iPhone 8 Plus (Battery Status: 100%)                       Pre-tested
      Note: All test modes were pre-tested, but we only recorded the worst case in this report.

H-Field Strength at 15 cm from the edges surrounding the EUT and 15cm from the top surface of the EUT
                                          Measured H-Field Strength Values (A/m)                      FCC H-Field       FCC H-Field
   Charging     Frequency
                                  Test          Test          Test          Test          Test        Strength50         Strength
    Battery       Range
                                Position      Position      Position      Position      Position       % Limits           Limits
     Level        (MHz)
                                   A             B             C             D             E             (A/m)            (A/m)
      1%           0.160          0.106         0.095         0.106         0.106        0.110           0.815              1.63
     50%           0.160          0.098         0.099         0.104         0.093        0.118           0.815              1.63
     99%           0.160          0.093         0.086         0.097         0.095        0.114           0.815              1.63

H-Field Strength at 20cm from the top surface of the EUT
                                                  Measured H-Field Strength                  FCC H-Field              FCC H-Field
      Charging           Frequency Range
                                                       Values (A/m)                      Strength50% Limits             Strength
    Battery Level             (MHz)
                                                          Test Position E                      (A/m)                  Limits (A/m)
           1%                  0.160                           0.095                             0.815                     1.63
         50%                   0.160                           0.084                             0.815                     1.63
         99%                   0.160                           0.081                             0.815                     1.63




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SHENZHEN LCS COMPLIANCE TESTING LABORATORY LTD. FCC ID: 2APU2CTVK08                                 Report No.: LCS190704024AEA


                                             WPT RF Exposure_Mobile
                      0.9

                      0.8

                      0.7
                                                                                                       Test Position A_15cm
                      0.6
      H-Field (A/m)




                                                                                                       Test Position B_15cm
                      0.5
                                                                                                       Test Position C_15cm
                      0.4
                                                                                                       Test Position D_15cm
                      0.3
                                                                                                       Test Position E_15cm
                      0.2
                                                                                                       50% Limit
                      0.1                                                                              Test Position E_20cm
                       0
                            1.00%                 50.00%                    99.00%
                                         Charging Battery Level


   10. Test Setup Photos

   10.1 Test Position E-Exposure photo from top surface (20cm)




                                                            20cm




                                                                 TM1

 9.2Test Position E-Exposure photo from top surface (15cm)




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SHENZHEN LCS COMPLIANCE TESTING LABORATORY LTD. FCC ID: 2APU2CTVK08                                 Report No.: LCS190704024AEA




                                                15cm




                                                       TM1
   9.3 Test Position A-Exposure photo from side edge surface-Rear




                                                                  15cm




                                                                    TM1

   9.4 Test Position B-Exposure photo from side edge surface-Left




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SHENZHEN LCS COMPLIANCE TESTING LABORATORY LTD. FCC ID: 2APU2CTVK08                                 Report No.: LCS190704024AEA




                                                     15cm




                                                                    TM1



   9.5 Test Position C-Exposure photo from side edge surface-Front




                                                              15cm




                                                                    TM1

   9.6 Test Position D-Exposure photo from side edge surface-Right




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SHENZHEN LCS COMPLIANCE TESTING LABORATORY LTD. FCC ID: 2APU2CTVK08                                 Report No.: LCS190704024AEA




                                                                                15cm




                                                                    TM1



   11. Conclusion

          A minimum safety distance of 20 cm to the antenna is required when the device is charging a smart
          phone. The detected emissions with a distance of 20 cm from center of probe to the top surface of
          EUT and 15cm from center of probe to edge of EUT are below the limitations according to FCC KDB
          680106 D01 Section 3. RF Exposure Requirement Clause 3.


                                                       Revision History

               Revision                      Issue Date                         Revisions                     Revised By
                 000                        July 23, 2019                      Initial Issue                  Gavin Liang




                              .........................END OF REPORT.........................




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Document Created: 2019-08-14 19:52:13
Document Modified: 2019-08-14 19:52:13

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