基于STM32F334做的数字CC/CV(恒压恒流)充电器

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Tiny。P 发布时间：2018-12-20 17:00

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本帖最后由 Tiny。P 于 2018-12-20 17:03 编辑

在上一个贴子中，我利用了STM32F334做的一个同步降压BUCK数字电源，帖子网址https://www.stmcu.org.cn/module/forum/thread-606783-1-1.html
本次做的充电器也是利用我们做的另一款BUCK-BOOST升降压变换器，加入三段式充电算法程序。锂电池的充电要求，大家可参阅网络资料，总的说就是预充、恒流充、恒压充三段式充电，这里直接贴出代码：

float32 CHARGE_VOLTAGE = 0; //充电电压
float32 CHARGE_CURRENT = 0; //充电电流

uint8 dp_ChargeState(void)
{
      static volatile uint8  ChargeSta       = CHARGE_IDLE;
      static uint32 precharge_time       = 0;
      static uint32 charge_time          = 0;
      static uint16 iflat_db                   = 0;

      switch(ChargeSta)
      {
         case CHARGE_IDLE:
               CHARGE_CURRENT = (float32)CHARGING_IFLOAT;
               CHARGE_VOLTAGE = (float32)CHARGING_VOLTAGE;
                  iflat_db = ( Iout >= CHARGING_ISTOP ) ? iflat_db+1 : 0;
                  if(iflat_db > 10)
                  {
                     ChargeSta = CHARGE_PRECHARGE;
                     iflat_db       = 0;
                     precharge_time  = 0;
                  }
         break;
         case CHARGE_FAULT:
                  CHARGE_CURRENT = (float32)CHARGING_ISTOP;
                  CHARGE_VOLTAGE = (float32)FLOATING_VOLTAGE;
                  flat_db    = 0;
         break;
         case CHARGE_DONE:
                  CHARGE_CURRENT = (float32)CHARGING_ISTOP;
                  CHARGE_VOLTAGE = (float32)FLOATING_VOLTAGE;
                  if( Vout<0.9f*FLOATING_VOLTAGE )ChargeSta = CHARGE_IDLE;
         break;
         case CHARGE_PRECHARGE:
                  CHARGE_CURRENT = (float32)PRECHARGE_ILIM;
                  CHARGE_VOLTAGE = (float32)CHARGING_VOLTAGE;
                  iflat_db = (Vout > CUTOFF_VOLTAGE) ? iflat_db+1 : 0;
                  if(iflat_db > 10)ChargeSta = CHARGE_CHARGING;
                  if(precharge_time > PRECHARGE_TIME)ChargeSta = CHARGE_FAULT;
                  precharge_time++;
            break;
            case CHARGE_CHARGING:
                  CHARGE_CURRENT = (float32)CHARGING_ILIM;
                  CHARGE_VOLTAGE = (float32)CHARGING_VOLTAGE;
                  iflat_db = (Vout > FLOATING_VOLTAGE && Iout < CHARGING_ISTOP) ? iflat_db+1 : 0;
                  if(iflat_db > 10)ChargeSta = CHARGE_FLOAT;
                  if(charge_time > CHARGE_TIME || Vout < CUTOFF_VOLTAGE)ChargeSta = CHARGE_FAULT;
                  charge_time++;
            break;
            case CHARGE_FLOAT:
                  CHARGE_CURRENT = (float32)CHARGING_IFLOAT;
                  CHARGE_VOLTAGE = (float32)FLOATING_VOLTAGE;
                  iflat_db = (Iout < CHARGING_ISTOP) ? iflat_db+1 : 0;
                  if(iflat_db > FLOATING_TIME)ChargeSta = CHARGE_DONE;
                  if(charge_time > CHARGE_TIME)ChargeSta = CHARGE_FAULT;
                  charge_time++;
            break;
      }//switch(..)
      return ChargeSta;
}

为满足用户给电池（或超级电容）充电需求，在双向Buck-Boost升降压电源板的基础上增加了电池的充电算法（三段式充电），本实验是对超级电容进行充电的测试示例。用户只需根据自己的电池型号进行修改如下参数（主函数内）即可，需注意的是电池的充电电流均要在板子最大输出电流之内。本实验所用超级电容参数：本实验充电对象是由12个单体电压为2.7V，电容为350F组成的额定电压为32.4V，容量为29F的超级电容组。

电容组充电的各参数设置情况如下图所示：