diff --git a/apps/chrg/applications/thread/chrg_comm.c b/apps/chrg/applications/thread/chrg_comm.c
index a64ee3b..dd2031b 100644
--- a/apps/chrg/applications/thread/chrg_comm.c
+++ b/apps/chrg/applications/thread/chrg_comm.c
@@ -27,7 +27,7 @@
 #include "stm32f4xx_hal.h"
 
 #define HOLD_REG_FIRMWARE_VERSION 0x0300U /* 协议板固件版本，只读 */
-#define CHRG_FIRMWARE_VERSION     0x0144U /* 当前协议板版本：V1.1.52 */
+#define CHRG_FIRMWARE_VERSION     0x0145U /* 当前协议板版本：V1.1.53 */
 
 
 rt_uint8_t ucDiscInBuf[(TOTAL_DISC_REGS+BITS_UCHAR-1)/BITS_UCHAR];
@@ -2022,12 +2022,11 @@ static eMBException chrg_comm_apply_sink_effect(rt_uint8_t ch,
 			pReal->sink.work_mode = SINK_WORK_INIT;
 		} else if (full_handshake_change) {
 			/*
-			 * 只有CC实际变化时才发送目标CC命令并等待；协议类型或组号
-			 * 单独变化时直接重发PD帧，不重复设置未变化的CC。
-			 * 协议与CC同时变化时先设置目标CC，CC稳定后再发送协议；
-			 * 仅协议变化时不重复设置未变化的CC。
+			 * 协议类型变化会复位Sink协议板，复位会清除协议板内部CC选择；
+			 * 即使上位机CC参数未变化，也必须重新设置CC并等待稳定后再设协议。
 			 */
-			if (diff_info.cc_changed && protocol_data_changed) {
+			if (diff_info.protocol_changed ||
+				(diff_info.cc_changed && protocol_data_changed)) {
 				/* Protocol-before-CC test flow is disabled in this version. */
 				target_sub = diff_info.cv_changed ?
 					IDX_SET_SINK_CC_BEFORE_PD_WITH_MODE :
diff --git a/apps/chrg/applications/thread/chrg_north.h b/apps/chrg/applications/thread/chrg_north.h
index 1707e0a..1b1a722 100644
--- a/apps/chrg/applications/thread/chrg_north.h
+++ b/apps/chrg/applications/thread/chrg_north.h
@@ -27,7 +27,7 @@
 #endif
 
 /* 南向COM批次中单通道连续收到有效回码后的最大发送条数。 */
-#define SOU_COM_BURST_MAX  2U
+#define SOU_COM_BURST_MAX  6U
 
 /* 自动停止带载后，电压恢复时需要连续确认的新P1采样帧数。 */
 #define SINK_LOAD_RESTART_CONFIRM_COUNT  2U
diff --git a/apps/chrg/applications/thread/chrg_roll_nor.c b/apps/chrg/applications/thread/chrg_roll_nor.c
index e7125b4..af4771e 100644
--- a/apps/chrg/applications/thread/chrg_roll_nor.c
+++ b/apps/chrg/applications/thread/chrg_roll_nor.c
@@ -270,6 +270,9 @@ static rt_bool_t chrg_roll_nor_sink_wait_process(rt_uint8_t ch,
 		g_sink_reset_wait_mask &= (rt_uint8_t)~bit;
 		g_sink_reset_wait_start[ch] = 0U;
 		chrg_nor_sw_rel((eIDX_NOR_CH)ch, ID_SINK);
+		#if SOUTH_COMMAND_DEBUG
+		rt_kprintf("-------D+D- OPEN AFTER RESET: CH%d------\n", ch + 1U);
+		#endif
 		pSW->sub = g_sink_reset_next_sub[ch];
 		g_sink_reset_next_sub[ch] = 0U;
 		return RT_TRUE;
diff --git a/apps/chrg/applications/utils/chrg_def.h b/apps/chrg/applications/utils/chrg_def.h
index f9f69ff..f2bb32c 100644
--- a/apps/chrg/applications/utils/chrg_def.h
+++ b/apps/chrg/applications/utils/chrg_def.h
@@ -14,8 +14,8 @@
 /* CHRG application version. Keep this value synchronized with the changelog. */
 #define CHRG_VERSION_MAJOR       1U
 #define CHRG_VERSION_MINOR       1U
-#define CHRG_VERSION_PATCH       52U
-#define CHRG_VERSION_STRING      "V1.1.52"
+#define CHRG_VERSION_PATCH       53U
+#define CHRG_VERSION_STRING      "V1.1.53"
 
 /*
  * Channel polling mode:
diff --git a/docs/修改日志.md b/docs/修改日志.md
index 6436116..a90783e 100644
--- a/docs/修改日志.md
+++ b/docs/修改日志.md
@@ -1,5 +1,13 @@
 # 修改日志
 
+## V1.1.53 - 2026-09-30
+
+### 负载协议切换后CC恢复
+
+- Sink协议类型切换触发复位后，固定重新下发CC选择并等待稳定，再设置目标协议。
+- 修复PD切换为标准5V时CC参数未变化而跳过CC设置，导致充电头不重新输出的问题。
+- 协议板版本寄存器 `0x0300` 更新为 `0x0145`。
+
 ## V1.1.52 - 2026-09-29
 
 ### 南向YMODEM发送结果校验