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Samsung S3F84B8 Design Manual Manual pdf 16 page image

Samsung S3F84B8 Design Manual

Also see for S3F84B8: User manual

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Contents
  1. Table Of Contents
  2. Table Of Contents
  3. OVERVIEW OF IH COOKER (IHC)
  4. Key Features of S3F84B8
  5. System Principle
  6. HARDWARE IMPLEMENTATION
  7. Table 2-1 S3F84B8 pin assignment in IH cooker system
  8. Power Supply
  9. Synchronization Circuit
  10. Figure 2-4 Waveform of the Synchronization Circuit
  11. Power control
  12. Current Measurement
  13. System Protection
  14. Temperature Protection
  15. Other Functions
  16. Key and Display Circuit
  17. SOFTWARE IMPLEMENTATION
  18. Software Diagram
  19. Internal Resource Arrangement and Configuration
  20. Error Code
Samsung S3F84B8 Design Manual Manual pdf 16 page image
S3F84B8_ALL-IN-ONE IH COOKER_AN_REV 0.00 2 HARDWARE IMPLEMENTATION2-102.4.2 CURRENT MEASUREMENTR4 1KOPA_OR13 36KRW110KOPA_NC10104JSY S_I+ C121uF/16VCURRENTR14 100KR1522KS3F84B8RfR 1 OPA _ NOPA _POPA _OGain = -Rf/R1Figure 2-6 Current Measurement CircuitIn the IH cooker system, the current can go as high as 10A. To avoid excessive energy loss, a constantan is usedto change the current signal to voltage signal, which is then amplified by the integrated OPA. Finally, the amplifiedsignal enters the ADC module. Note that the signal (OPA_N) reaching OPA is negative as compared to MCUGND. Therefore, OPA has to work as an inverting amplifier with negative gain.Either the OPA offset or the resistance deviation can lead to inconsistency of output power among different chips.To get precise power control, two calibrating methods are used. In hardware, a variable resistor (RW1) is chosen,whereas in software algorithm, the overall offset is measured and calculated before the system starts working. Itlikes the quiescent bias that should be removed during normal operation. This way the output power can becontrolled within 10W deviation.
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