Ultralow No-Load Conduction Loss DC Converter
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional DC-DC converters experience significant no-load conduction loss, which cannot be effectively eliminated by existing methods, leading to low efficiency at no-load conditions despite improved efficiency at high loads.
Innovation Solution
An ultralow no-load conduction loss DC converter design that allows decision-making to turn off the drive control unit at the secondary side, utilizing a PWM controller to enter burst mode or pulse skipping mode, and employing the body diode of the second MOSFET to rectify current, thereby minimizing non-load conduction loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If decision to turn off drive control unit is made at primary side through current detection, then no-load conduction loss is reduced, but complexity of control increases
Solution Approach 1:
The patent introduces an intermediary mechanism (the body diode) that automatically takes over rectification function when the power MOSFET is turned off. This eliminates the need for complex primary-side current detection and control logic, as the body diode inherently provides the necessary rectification during no-load conditions.
Solution Approach 2:
The body diode of the power MOSFET serves itself as a backup rectification path. When the drive control unit is shut down during no-load conditions, the body diode automatically conducts to maintain output voltage, eliminating the need for external control intervention or complex decision-making circuits.
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
This design significantly reduces no-load conduction loss by eliminating driving energy consumption, enhancing efficiency even at no-load conditions compared to prior art techniques.
Implementation Method 1
enabling the body diode of the second MOSFET to rectify the current
Implementation Method 2
a transformer having a primary side and a secondary side. The primary side comprises a first winding... The secondary side comprises a second winding, a third winding
Data Source
AI summary
An ultralow no-load conduction loss DC converter includes a DC power source, a transformer having a first winding, a first MOSET and a PWM controller at the primary side and a second winding, a third winding, a drive control unit, a rectifier unit and a second MOSFET at the secondary side. The second MOSFET, the drive control unit and the rectifier unit constitutes a combination circuit electrically coupled between one end of the second winding and one end of the third winding. The second MOSFET has set therein a body diode. The second winding and the second MOSFET forms a combination circuit electrically connected to a load. Thus, the decision to turn off the drive control unit is made at the secondary side so that non-load conduction loss can be minimized.