PD Fast Charging Circuit With Pass-Through Mode for Multi-Port Efficiency
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Solution Overview
Problem
Current PD fast charging sources experience significant heat generation and low power conversion efficiency due to the inability to efficiently adjust output voltage to match varying charging load requirements.
Innovation Solution
A PD fast charging control circuit and method that includes an isolated DC/DC conversion module, a multi-channel buck module, a pass-through mode control module, and a feedback voltage control module. This configuration allows the circuit to dynamically adjust the output voltage to match the charging load's requirements by switching between normal and pass-through modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the PD fast charging source outputs power via multiple ports using traditional buck conversion, then it can charge multiple devices, but power conversion efficiency decreases and heat generation increases
Solution Approach 1:
The patent implements dynamic mode switching between pass-through mode and buck conversion mode based on real-time detection of charging load requirements. The control module dynamically adjusts the working mode of each channel: when a port connects to a device requiring pass-through voltage (e.g., laptop), it switches to pass-through mode; when connecting to devices requiring voltage conversion (e.g., mobile phones), it uses buck conversion mode. This dynamic adaptation resolves the contradiction by optimizing power conversion efficiency for each port individually while maintaining multi-port charging capability.
Solution Approach 2:
The patent applies different power conversion strategies to different ports based on their specific loading conditions. Each channel independently detects its own voltage requirements and selects the appropriate conversion mode, rather than applying a uniform conversion approach to all ports. This localized optimization allows high-efficiency pass-through operation for ports needing it while maintaining necessary buck conversion for ports requiring voltage adjustment, thereby resolving the efficiency loss in multi-port scenarios.
2Device complexity
If the PD fast charging source uses fixed voltage output, then the circuit design is simple, but it cannot adapt to varying voltage requirements of different charging loads
Solution Approach 1:
The patent implements variable voltage output by detecting the voltage requirements of connected devices and dynamically adjusting the output voltage parameters. The control module receives voltage requirement information from each charging port and adjusts the DC/DC conversion parameters accordingly, enabling the system to adapt to different voltage standards (e.g., 5V, 12V, 20V) while maintaining a relatively simple circuit architecture through intelligent control rather than multiple fixed-voltage circuits.
Solution Approach 2:
The patent employs feedback control mechanisms where the control module continuously monitors the voltage requirements of connected devices and adjusts the power conversion parameters in real-time. The system receives feedback about the connected device's voltage needs and automatically adjusts its output accordingly, achieving high adaptability without requiring complex multi-mode circuit designs. This feedback-driven approach resolves the contradiction by using intelligent control to compensate for circuit simplicity.
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 power conversion efficiency by ensuring the output voltage matches the charging load's requirements, reducing heat generation and enhancing overall performance even when multiple ports are connected.
Implementation Method 1
an isolated direction current (AC) to DC (DC/DC) conversion module (1101), a multi-channel buck module (1102)
Implementation Method 2
The multi-channel buck module (1102) is configured to buck the DC voltage
Data Source
AI summary
A power delivery (PD) fast charging control circuit and a PD fast charging control method are provided in the disclosure. The PD fast charging control circuit includes an isolated direction current (DC) to DC (DC/DC) conversion module, a multi-channel buck module, a pass-through mode control module, and a feedback voltage control module. The isolated DC/DC conversion module is configured to output a DC voltage. The multi-channel buck module is configured to buck the DC voltage. The pass-through mode control module is configured to generate a control signal according to a charging load connected, send the control signal to the feedback voltage control module, and control an operating mode of the multi-channel buck module. The operating mode includes a normal mode and a pass-through mode. The feedback voltage control module is configured to control a voltage value of the DC voltage according to the control signal received.