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Samsung S3F84B8 Design Manual Manual pdf 9 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 9 page image
S3F84B8_ALL-IN-ONE IH COOKER_AN_REV 0.00 1 OVERVIEW OF IH COOKER (IHC)1-3Comparator1/2/3 has only one input with an internal programmable reference level. It can lock the output of PWMto a safe level. Besides the delay trigger function, PWM can realize anti-mis-trigger function as well. It preventsthe PWM from being triggered by unexpected noise. For more information about the cooperating mechanism ofthe IH-PWM and four comparators, refer to the user’s manual.1.3 SYSTEM PRINCIPLETo make the system work reliably, the control of IH cooker can be divided into two major parts: heating andprotection.1.3.1 HEATINGIn earlier solutions, the output of LM339 controls the IGBT. On being filtered, the PWM output transforms into ananalog signal that sets the flip level of LM339. Therefore, only the duty determines the output power.However, in a system with S3F84B8, the PWM directly controls the switch of IGBT and the width of valid outputlevel determines the output power. Therefore, the power is dependent on the system clock.1.3.2 PROTECTIONTwo kinds of protection are available for the control of IH cooker: first is time sensitive protection, and the other isacceptable protection that can be executed even after certain degree of delay.Surge protection and IGBT over-voltage protection belong to the former class (time sensitive protection).Therefore, these two signals use the integrated comparators. In this solution, PWM will be hard-locked whensurge protection is triggered. It stops the PWM with a safe output level until the software enables it again. Oncethe voltage sensed at IGBT is beyond limitation, PWM will be soft-locked. This will make the PWM stop the currentcycle and reload PWMDATA with a preset safe value (PWMPDATA) to reduce the turn-on time of IGBT from thatinstance.Over-temperature, over-current, and over/under voltage protections belong to the latter class. They are realized byAD conversion and software comparison.
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