Charging Device Discharging Circuit for Non-Compliant PD Devices
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Solution Overview
Problem
Conventional charging devices often fail to reliably charge electronic devices that do not meet safety input standards, leading to communication and charging failures.
Innovation Solution
A charging device incorporating a bridge rectifier, transformer, power switch element, output stage circuit, feedback compensation circuit, PWM IC, discharging circuit, and controller, which generates and fine-tunes the output voltage to ensure compatibility with electronic devices, using a discharging circuit to reduce voltage levels and maintain stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional charging devices communicate with electronic devices before charging, then charging operations can be performed on compliant devices, but communication and charging operations fail when electronic devices do not meet safety input standards
Solution Approach 1:
The discharging circuit performs preliminary action by reducing the output voltage to a safe level before the charging operation begins. The controller detects when an electronic device is connected and activates the discharging circuit to lower the voltage from the rectified level to a safe operating level, preventing communication and charging failures on non-compliant devices
Solution Approach 2:
The discharging circuit acts as an intermediary between the high-voltage rectifier output and the electronic device input. It provides a buffer that mediates the voltage level, allowing the charging device to work with both compliant and non-compliant devices by translating the voltage to appropriate levels
2Productivity
If the output voltage is maintained at high levels for efficient power delivery, then charging speed improves, but compatibility with devices requiring lower voltage levels decreases
Solution Approach 1:
The charging device dynamically adjusts the output voltage based on the connected electronic device's requirements. The controller monitors the device and activates the discharging circuit when needed to reduce voltage, enabling the system to switch between high-voltage fast charging mode and low-voltage compatibility mode
Solution Approach 2:
The system changes the voltage parameter dynamically by using the discharging circuit to reduce the output voltage level. This allows the same charging device to operate at different voltage levels - high for fast charging when appropriate, and reduced for compatibility with devices requiring lower voltage
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution significantly improves the reliability and output stability of the charging device, enabling successful charging operations even when electronic devices do not meet safety input standards.
Implementation Method 1
a bridge rectifier (210), a first capacitor (C1), a transformer (220)
Implementation Method 2
The transformer (220) includes a main coil (221) and a secondary coil (222). The main coil (221) receives the rectified voltage VR, and the secondary coil (222) generates an induced voltage VS.
Data Source
AI summary
A charging device supporting PD (Power Delivery) includes a bridge rectifier, a first capacitor, a transformer, a power switch element, an output stage circuit, a feedback compensation circuit, a PWM (Pulse Width Modulation) IC (Integrated Circuit), a discharging circuit, and a controller. The bridge rectifier generates a rectified voltage according to a first input voltage and a second input voltage. The transformer includes a main coil and a secondary coil. The main coil receives the rectified voltage, and the secondary coil generates an induced voltage. The output stage circuit generates an output voltage according to the induced voltage and a first control voltage. The controller generates the first control voltage and a second control voltage according to the output voltage. The discharging circuit selectively reduces the voltage level of the output voltage according to the second control voltage.