Power Supply Bypass for Laptop Buck-Boost Efficiency
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Solution Overview
Problem
Conventional power supply methods for laptops with Buck-Boost Charger ICs perform unnecessary voltage conversion when no battery is installed, leading to power loss and inefficiency, which is a concern for environmental regulations and energy savings.
Innovation Solution
A power supply method that detects the absence of a battery and controls a switch circuit to bypass unnecessary buck-conversion, directly delivering the input voltage to the system's backend equipment through a current path, avoiding unnecessary voltage conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional Buck-Boost Charger is used to support wide input voltage range, then the system can accept various input voltages, but unnecessary buck-conversion is performed even when no battery is installed, causing power loss
Solution Approach 1:
The power supply system dynamically switches between buck-conversion mode and direct pass-through mode based on battery installation status. When no battery is detected, the system bypasses the buck-conversion circuit and directly transmits input voltage to the receiving terminal, eliminating unnecessary energy conversion while maintaining wide input voltage adaptability when battery is present
Solution Approach 2:
The unnecessary buck-conversion stage is extracted from the power supply path when battery is not installed. The system separates the power transmission path into two modes: one with buck-conversion for battery-charging scenarios, and another without buck-conversion for direct power delivery scenarios, removing the energy-lossy component when it's not needed
Data Source
AI summary
A power supply method includes the following steps: detecting whether a battery is installed in a system; delivering a control signal to a power conversion circuit by a controller when it is determined that the battery is not installed in the system; turning on part of a plurality of transistors and turning off the other part of the plurality of transistors by the power conversion circuit according to the control signal and a reference signal, so that an input voltage is delivered to a receiving terminal of the system from a sending terminal of the system through a current path.