Smart Charger Trigger

 

User Manual: PD and QC Smart Charger Trigger Device

1. 1. Overview

   This Smart USB Power Trigger module allows you to extract selected high-power DC voltage rails—such as 5V, 9V, 12V, 15V, and 20V—from any compatible USB-PD or Quick Charge (QC) Type-C power bank or wall charger.

   Equipped with a bright graphical display and intelligent operating modes, this device lets you safely select voltage profiles, perform dynamic switching tests, and monitor live power metrics in real time.

   2. Key Features

   • Multi-Voltage Output Trigger: Effortlessly request 5V, 9V, 12V, 15V, or 20V DC output rails.

   • Smart OLED Display: Real-time live readings for Voltage ($V$) and Current ($A$).

   • Dual Operating Modes: Dedicated Auto-Scan and Manual Selection modes.

   • Display Power Saver: Dedicated toggle button to turn the screen ON/OFF without interrupting output power.

   • Status LED Indicators: Clear visual indicators for active operating modes and active high-voltage rails (15V / 20V).

   3. Getting Started

   Plaintext

    ┌────────────────────────────────────────────────────────┐
    │                   GRAPHICAL DISPLAY                    │
    │               [ Live Voltage & Current ]               │
    └────────────────────────────────────────────────────────┘
   
    [ AUTO MODE LED ] ── Active during automatic voltage scanning
    [ MANUAL MODE LED ] ─ Active during fixed voltage selection
   
    [ 15V LED ] ──────── Illuminates when 15V output rail is active
    [ 20V LED ] ──────── Illuminates when 20V output rail is active
   
    [ DISPLAY BUTTON ] ─ Press once to toggle screen ON / OFF
   

   Step 1: Connecting Input Power

   1. Connect a USB Type-C cable from a compatible USB-PD/QC charger or power bank into the module's Type-C Input Port.

   2. Upon plugging in, the OLED display turns ON instantly and shows the default boot status and initial voltage reading.

   Step 2: Connecting Your Load

   • Connect your external project, circuit, or device to the module's Output Screw Terminals / Connectors.

   4. Controls & Operating Instructions

   A. Display Monitoring & Power Control

   • Live Readouts: The screen continuously updates real-time output Voltage ($V$) and load Current ($A$).

   • Display ON/OFF Switch:

     • Press the Display Push Button once to switch off the screen during extended tests to save energy or prevent glare.

     • Background Safety: Turning off the display does not cut power to your load. The device continues delivering output power and monitoring internal safety parameters in the background.

     • Press the button again to turn the screen back ON.

   B. Mode Selection & Voltage Control

   1. Auto Mode

   • Indicator: The AUTO MODE LED lights up.

   • Function: In this mode, the device automatically scans through all supported power profiles (5V $\rightarrow$ 9V $\rightarrow$ 12V $\rightarrow$ 15V $\rightarrow$ 20V) offered by the connected charger.

   • Best Used For: Testing charger capability, protocol detection, and dynamic switching stability.

   2. Manual Mode

   • Indicator: The MANUAL MODE LED lights up.

   • Function: In this mode, you can manually step through specific voltage levels using the voltage selector buttons.

   • Status LEDs:

     • 15V LED: Illuminates when the 15V rail is locked and active.

     • 20V LED: Illuminates when the 20V rail is locked and active.

   5. Step-by-Step Voltage Switching Test Procedure

   To perform a complete voltage switching test on a USB charger:

   1. Plug the module into the USB-PD charger via the Type-C port.

   2. Press the Mode Selection Button until the Manual Mode LED illuminates.

   3. Use the voltage switch button to step through each output level sequentially: 5V $\rightarrow$ 9V $\rightarrow$ 12V $\rightarrow$ 15V $\rightarrow$ 20V.

   4. Observe the live display readout at each step to confirm the charger steps up its output rail accurately.

   5. If a charger does not support a requested voltage (e.g., a 15V maximum power bank requested for 20V), the device will safely drop back to the highest available lower rail.

   6. Safety & Best Practices

   • Verify Voltage Before Connecting Loads: Always check the selected output voltage on the display or status LEDs before connecting sensitive electronic devices to the output terminals.

   • Respect Current Limits: Ensure your connected load does not exceed the maximum current rating ($A$) specified by your USB charger.

   • Avoid Output Short Circuits: Ensure positive and negative output wire leads do not touch while power is active