关于晶体管测试仪测量ESR的原理

长寿烙铁

最近学习了一下晶体管测试仪的程序，了解了一些测试原理。
由于初学单片机，而且不懂英语，还有一些问题不明白，请大家多多指教。

长寿烙铁

ESR测量  

  

//=================================================================

uint16_t GetESR(uint8_thipin, uint8_t lopin) {

#if FLASHEND > 0x1fff

  // measure the ESR value of capacitor

  unsigned int adcv[4];     // array for 4 ADC readings

  unsigned long sumvolt[4]; // array for 3 sums of ADC readings

  unsigned long cap_val_nF; // measured capacity value in nF units

  uint16_t esrvalue;

  uint8_t HiPinR_L;         // used to switch 680 Ohm to HighPin

  uint8_t HiADC;        // used to switch Highpin directly to GND or VCC用于将高脚直接切换到GND或VCC

  uint8_t LoPinR_L;         // used to switch 680 Ohm to LowPin

  uint8_t LoADC;        // used to switch Lowpin directly to GND or VCC

  uint8_t ii;           //tempory value

  int8_t pp;            //tempory prefix

  uint8_t StartADCmsk;      // Bit mask to start the ADC

  uint8_t SelectLowPin,SelectHighPin;

  int8_t esr0;          //used for ESR zero correction

#ifdef ADC_Sleep_Mode

        StartADCmsk = (1<<ADEN) | (1<<ADIF) |(1<<ADIE) | AUTO_CLOCK_DIV; /* enable ADC and Interrupt */

        ADCSRA = StartADCmsk;     /* enable ADC and Interrupt */

#else

        StartADCmsk =  (1<<ADSC) | (1<<ADEN) | (1<<ADIF) | AUTO_CLOCK_DIV; /*enable and start ADC */

#endif

  }

#if (((PIN_RL1 + 1) !=PIN_RH1) || ((PIN_RL2 + 1) != PIN_RH2) || ((PIN_RL3 + 1) != PIN_RH3))

  LoADC = pgm_read_byte((&PinRLRHADCtab[6])+lopin-TP_MIN)| TXD_MSK;

  HiADC =pgm_read_byte((&PinRLRHADCtab[6])+hipin-TP_MIN) | TXD_MSK;

#else

  LoADC =pgm_read_byte((&PinRLRHADCtab[3])+lopin-TP_MIN) | TXD_MSK;

  HiADC =pgm_read_byte((&PinRLRHADCtab[3])+hipin-TP_MIN) | TXD_MSK;

#endif

  LoPinR_L =pgm_read_byte(&PinRLRHADCtab[lopin-TP_MIN]);  //R_L mask for LowPin R_L load

  HiPinR_L =pgm_read_byte(&PinRLRHADCtab[hipin-TP_MIN]);    //R_L mask for HighPin R_L load

#if (PROCESSOR_TYP == 644) ||(PROCESSOR_TYP == 1280)

    /* ATmega640/1280/2560 1.1V Reference withREFS0=0 */

  SelectLowPin = (lopin | (1<<REFS1) |(0<<REFS0)); // switch ADC toLowPin, Internal Ref.

  SelectHighPin = (hipin | (1<<REFS1) |(0<<REFS0));    // switch ADC toHighPin, Internal Ref.

#else

  SelectLowPin = (lopin | (1<<REFS1) |(1<<REFS0)); // switch ADC toLowPin, Internal Ref.

  SelectHighPin = (hipin | (1<<REFS1) |(1<<REFS0));    // switch ADC toHighPin, Internal Ref.

#endif

//图F

   ADC_PORT = TXD_VAL;       // switch ADC-Port to GND

   ADMUX = SelectLowPin;     // set Mux input and Voltage Reference to internal 1.1V  将mux输入和电压基准设置为内部1.1v

#ifdef NO_AREF_CAP

   wait100us();              /*time for voltage stabilization */

#else

   wait_about10ms();         /* time for voltage stabilization with 100nF */

#endif

   /* start voltage must be negativ启动电压必须为负电压*/

   ADC_DDR = HiADC;                   // switch High Pin to GND

   R_PORT = LoPinR_L;            // switch R-Port to VCC

   R_DDR = LoPinR_L;             // switch R_L port for HighPin to output (VCC)

   wait10us();

   wait2us();

   R_DDR = 0;                //switch off current关断电流

   R_PORT = 0;

   StartADCwait();               // set ADCSRA Interrupt Mode, sleep设置ADCSRA中断模式，休眠

   // Measurement frequency is given by sum ofADC-Reads < 680 Hz for normal ADC speed.

//测量频率由ADC读数的和来确定，正常ADC速度小于680 Hz

   // For fast ADC mode the frequency is below2720 Hz

//对于快速adc模式，频率在2720 Hz以下(used for capacity value below 3.6uF).

   // ADC Sample and Hold (SH) is done 1.5 ADCclock number after real start of conversion.

// ADC采样和保持是在真正开始转换后1.5个ADC时钟数完成。

   // Real ADC-conversion is started with thenext ADC-Clock (125kHz) after setting the ADSC bit.

// 在设置ADSC位之后，下一个ADC时钟（125kHz）开始实际ADC转换。

  

for(ii=0;ii<MAX_CNT;ii++) {

//图A

      ADC_DDR = LoADC;                // switch Low-Pin to output (GND)

      R_PORT = LoPinR_L;          // switch R-Port to VCC

      R_DDR = LoPinR_L;           // switch R_L port for LowPin to output (VCC)

      ADMUX = SelectLowPin;

      StartADCwait();             // set ADCSRA Interrupt Mode, sleep

      StartADCwait();             // set ADCSRA Interrupt Mode, sleep

      adcv[0] = ADCW;             // Voltage LowPin with current

//图B

     ADMUX = SelectHighPin;

         StartADCwait();          // ADCSRA = (1<<ADEN)| (1<<ADIF) | (1<<ADIE) | AUTO_CLOCK_DIV;  

         ADCSRA = (1<<ADSC) | (1<<ADEN) | (1<<ADIF) |AUTO_CLOCK_DIV; // enable ADC and start with ADSC

         wait4us();

         R_PORT = HiPinR_L;            // switch R-Port to VCC

         R_DDR = HiPinR_L;             // switch R_L port for HighPin tooutput (VCC)

         DelayBigCap();       // wait predefined time

      R_DDR = 0;                  

// switch current off,  SH is 1.5 ADC clock behind real start电流关闭，实际启动1.5个ADC时钟后完成SH

      R_PORT = 0;

      while (ADCSRA&(1<<ADSC));       // wait for conversion finished

      adcv[1] = ADCW;             // Voltage HighPin with current

#ifdef ADC_Sleep_Mode

      ADCSRA = StartADCmsk;       /* enable ADC and Interrupt */

#endif

      wdt_reset();

      /* ********* Reverse direction, connectHigh side with GND反向，将高侧与GND连接*********** */

    // 图C

ADC_DDR = HiADC;                // switch High Pin to GND 是否和adcv[2]有冲突

      R_PORT = HiPinR_L;          // switch R-Port to VCC

      R_DDR = HiPinR_L;           // switch R_L port for HighPin to output (VCC)

      wdt_reset();

      ADMUX = SelectHighPin;

      StartADCwait();             // set ADCSRA Interrupt Mode, sleep

      StartADCwait();             // set ADCSRA Interrupt Mode, sleep

      adcv[2] = ADCW;             // Voltage HighPin with current

   //图D

ADMUX = SelectLowPin;

         StartADCwait();          // set ADCSRA Interrupt Mode, sleep

         ADCSRA = (1<<ADSC) | (1<<ADEN) | (1<<ADIF) |AUTO_CLOCK_DIV; // enable ADC and start with ADSC

         wait4us();

         R_PORT = LoPinR_L;

         R_DDR = LoPinR_L;             // switch LowPin with 680 Ohm to VCC

         DelayBigCap();       // wait predefined time

      R_DDR = 0;                  // switch current off

      R_PORT = 0;

      while (ADCSRA&(1<<ADSC));       // wait for conversion finished

      adcv[3] = ADCW;             //  Voltage LowPinwith current

#ifdef ADC_Sleep_Mode

      ADCSRA = StartADCmsk;       /* enable ADC and Interrupt */

#endif

长寿烙铁

参考程序

#ifdef INHIBIT_SLEEP_MODE

//  #define StartADCwait() ADCSRA =(1<<ADSC) | (1<<ADEN)| (1<<ADIF) | AUTO_CLOCK_DIV; /* enable ADC and start */

    #define StartADCwait() ADCSRA =(1<<ADSC)|(1<<ADEN)|(1<<ADIF)|AUTO_CLOCK_DIV;/* Start conversion */\

    while (ADCSRA & (1 <<ADSC));  /* wait until conversion is done等待转换完成*/

#else

    #define StartADCwait() ADCSRA = (1<<ADEN) | (1<<ADIF) |(1<<ADIE) | AUTO_CLOCK_DIV; /*enable ADC and Interrupt */\

    set_sleep_mode(SLEEP_MODE_ADC);\

    sleep_mode();  /* Start ADC, return, if ADC has finished */

#endif

#if (TP1 < TP2) &&(TP1 < TP3)

#define TP_MIN TP1

#endif

#if (TP2 < TP1) &&(TP2 < TP3)

#define TP_MIN TP2

#endif

#if (TP3 < TP1) &&(TP3 < TP2)

#define TP_MIN TP3

#endif

// The combined Table forswitching RL / RH and ADC pins, index is the TP number

const unsigned char PinRLRHADCtab[] PROGMEM ={

(1<<PIN_RL1),

                        (1<<PIN_RL2),

                       (1<<PIN_RL3),  // Table ofcommands to switch the  R-L resistors Pin0,1,2

#if (((PIN_RL1 + 1) !=PIN_RH1) || ((PIN_RL2 + 1) != PIN_RH2) || ((PIN_RL3 + 1) != PIN_RH3))

// Processors with little memory must use onePin number higher than correspondig Low Resistor

/* PinRHtab */             (1<<PIN_RH1),

                       (1<<PIN_RH2),

                       (1<<PIN_RH3),  // Table ofcommands to switch the  R-L resistors Pin0,1,2

#endif

         // Table include the predefined value TXD_VAL of otheroutput port(s) of port C.

         // Every pin, that should be switched permanent to VCClevel, should be set to 1 in every tab position.

         // The predefined value TXD_MSK defines the pin (all pins),that must be switched permanent to output.

/* PinADCtab */            (1<<TP1)|TXD_VAL,

                       (1<<TP2)|TXD_VAL,

                       (1<<TP3)|TXD_VAL}; // Tableof commands to switch the ADC-Pins 0,1,2 to output

#define pgm_read_byte

// macros for easilyacquiring the bitmasks for pins

#define pinmaskRL(pin)pgm_read_byte(PinRLRHADCtab+(pin))

#if (((PIN_RL1 + 1) !=PIN_RH1) || ((PIN_RL2 + 1) != PIN_RH2) || ((PIN_RL3 + 1) != PIN_RH3))

#define pinmaskRH(pin)pgm_read_byte(PinRLRHADCtab+(pin)+3)

#define pinmaskADC(pin)(pgm_read_byte(PinRLRHADCtab+(pin)+6)) | TXD_MSK

#else

#define pinmaskRH(pin) (pinmaskRL(pin)<<1)

#define pinmaskADC(pin)(pgm_read_byte(PinRLRHADCtab+(pin)+3)) | TXD_MSK

#endif

worldlyguest

收藏学习了，感谢！

长寿烙铁

图C中 ADC_DDR = HiADC;                // switch High Pin to GND
是否和adcv[2]有冲突，引脚接地，怎么测量电压

陈继斌

一脸懵逼的点开，一脸懵逼的关闭:titter:

网络孤客

我对这话题也感兴趣，但没研究。
只能帮顶一下。

海岛椰子树

我可以在这里跟你请教一下我那个1602的屏幕芯片烧了，可以问一下怎样恢复吗？就是拿它来物测带电的电容烧坏的。就是电路加上PTC主来保护芯片吗？

cat_li

一脸懵逼的点开，一脸懵逼的关闭

小向

海岛椰子树 发表于 2019-3-29 15:24
我可以在这里跟你请教一下我那个1602的屏幕芯片烧了，可以问一下怎样恢复吗？就是拿它来物测带电的电容烧坏 ...

屏幕芯片烧了就别折腾了，换新屏幕，还有，电桥还是万用表还有晶体管测试仪，都不能测带电电容，都是要放电后再测

bxak

官网开源文件里有原理说明pdf

长寿烙铁

bxak 发表于 2019-3-31 09:32
官网开源文件里有原理说明pdf

英文网站看不懂啊