diff --git a/zh_ac_dimmer.c b/zh_ac_dimmer.c
index 1b06e96..df4a5c2 100755
--- a/zh_ac_dimmer.c
+++ b/zh_ac_dimmer.c
@@ -197,7 +197,8 @@ static void IRAM_ATTR _zh_ac_dimmer_isr_handler(void *arg)
         return;
     }
     uint64_t _current_us = esp_timer_get_time();
-    if (_current_us - _prev_us <= 1000)
+    if (_current_us - _prev_us <= (1000000 / (_init_config.ac_frequency * 2)) * 0.9)
+    // if (_current_us - _prev_us <= 1000)
     {
         // _prev_us = _current_us;
         return;
@@ -215,8 +216,8 @@ static void IRAM_ATTR _zh_ac_dimmer_isr_handler(void *arg)
             gpio_set_level(_init_config.triac_gpio, 1);
             return;
         }
-        // _alarm_config.alarm_count = (uint64_t)(((_current_period_us / 110) * (100 - _dimmer_value)) + _zero_cross_us);
-        _alarm_config.alarm_count = (uint64_t)((1000000 / (_init_config.ac_frequency * 200)) * (100 - _dimmer_value));
+        // _alarm_config.alarm_count = (uint64_t)((((1250 - 360) / 100) * (100 - _dimmer_value)));
+        _alarm_config.alarm_count = (uint64_t)(((1000000 / (_init_config.ac_frequency * 200)) * (100 - _dimmer_value)));
         // _alarm_config.alarm_count = (uint64_t)((_current_period_us / 100) * (100 - _dimmer_value));
         _alarm_config.flags.auto_reload_on_alarm = false;
         gptimer_set_alarm_action(_dimmer_timer, &_alarm_config);