diff --git a/docs/05_architecture_overview.md b/docs/05_architecture_overview.md
index 8100b57..10558c7 100644
--- a/docs/05_architecture_overview.md
+++ b/docs/05_architecture_overview.md
@@ -11,6 +11,8 @@ This document provides a high-level view of the framework’s components and how
 - Mock LIN Adapter — `ecu_framework/lin/mock.py`
 - BabyLIN Adapter — `ecu_framework/lin/babylin.py` (SDK wrapper → BabyLIN_library.py)
 - Flasher — `ecu_framework/flashing/hex_flasher.py`
+- Power Supply (PSU) control — `ecu_framework/power/owon_psu.py` (serial SCPI)
+- PSU tryout script — `vendor/Owon/tryout.py`
 - Reporting Plugin — `conftest_plugin.py` (docstring → report metadata)
 - Reports — `reports/report.html`, `reports/junit.xml`
 
@@ -30,12 +32,15 @@ flowchart TB
     MOCK[ecu_framework/lin/mock.py]
     BABY[ecu_framework/lin/babylin.py]
     FLASH[ecu_framework/flashing/hex_flasher.py]
+    POWER[ecu_framework/power/owon_psu.py]
   end
 
   subgraph Artifacts
     REP[reports/report.html<br/>reports/junit.xml]
   YAML[config/*.yaml<br/>babylin.example.yaml<br/>test_config.yaml]
+    PSU_YAML[config/owon_psu.yaml<br/>OWON_PSU_CONFIG]
     SDK[vendor/BabyLIN_library.py<br/>platform-specific libs]
+    OWON[vendor/Owon/tryout.py]
   end
 
   T --> CF
@@ -44,10 +49,13 @@ flowchart TB
   CF --> MOCK
   CF --> BABY
   CF --> FLASH
+  T --> POWER
   PL --> REP
 
   CFG --> YAML
+  CFG --> PSU_YAML
   BABY --> SDK
+  T --> OWON
   T --> REP
 ```
 
@@ -57,6 +65,9 @@ flowchart TB
 - Config loader reads YAML (or env override), returns typed dataclasses
 - LIN calls are routed through the interface abstraction to the selected adapter
 - Flasher (optional) uses the same interface to program the ECU
+- Power supply control (optional) uses `ecu_framework/power/owon_psu.py` and reads
+  `config.power_supply` (merged with `config/owon_psu.yaml` or `OWON_PSU_CONFIG` when present);
+  the tryout script under `vendor/Owon/` provides a quick manual flow
 - Reporting plugin parses docstrings and enriches the HTML report
 
 ## Extending the architecture