Flyback Power Adapter With Dynamic Switch Units For Independent Voltage Control
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Solution Overview
Problem
Existing power adapters with flyback circuits struggle to achieve independent voltage control and flexible power distribution across multiple output ports, particularly for USB PD type-C and other interfaces, due to fixed output voltage ratios and increased volume and cost from additional circuits.
Innovation Solution
A power adapter design featuring a transformer with a primary and secondary winding, a primary circuit with a main switch, and a secondary circuit with bidirectional switch units, along with a control circuit that detects output voltages and adjusts the switch units to independently control output voltages and power distribution across multiple output ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two or more output ports are connected to a same flyback circuit with fixed turn ratios, then the circuit structure remains simple, but the output voltage ratio becomes fixed and cannot meet independent voltage control requirements
Solution Approach 1:
The patent applies dynamics by replacing fixed turn ratio connections with dynamically controllable switch units. Each output port is equipped with switch units that can be selectively turned on or off to change the effective winding connections, enabling the output voltage ratios to be dynamically adjusted according to different working conditions rather than being fixed by physical winding ratios.
Solution Approach 2:
The patent changes the parameter of voltage ratio from a fixed physical property (determined by winding turns) to a controllable electrical parameter. By using control circuits to regulate the switch units, the output voltage ratios can be changed on demand to meet different interface requirements such as USB PD type-C and other interfaces with different voltage specifications.
2Adaptability or versatility
If a BUCK circuit is added to achieve independent voltage control, then voltage independence is achieved, but the output voltage is limited and volume and cost increase
Solution Approach 1:
The patent makes the flyback circuit universal by enabling it to serve multiple output ports with different voltage requirements simultaneously. The switch units allow the same flyback circuit to configure different winding connections for different output ports, making the circuit adaptable to various voltage specifications without requiring separate dedicated circuits for each port, thus reducing overall volume.
Solution Approach 2:
The patent merges the voltage regulation function into the existing flyback circuit structure itself, rather than adding separate BUCK circuits. By integrating the voltage control capability directly into the flyback circuit through switch units, the solution combines multiple functions (power conversion and voltage regulation) into a single circuit, reducing component count and adapter volume.
3Adaptability or versatility
If a BUCK circuit is added to achieve independent voltage control, then voltage independence is achieved, but the cost of the adaptor increases
Solution Approach 1:
The patent merges the voltage regulation function into the existing flyback circuit structure itself, rather than adding separate BUCK circuits. By integrating the voltage control capability directly into the flyback circuit through switch units, the solution combines multiple functions (power conversion and voltage regulation) into a single circuit, reducing component count and adapter volume.
Solution Approach 2:
The patent makes the flyback circuit universal by enabling it to serve multiple output ports with different voltage requirements simultaneously. The switch units allow the same flyback circuit to configure different winding connections for different output ports, making the circuit adaptable to various voltage specifications without requiring separate dedicated circuits for each port, thus reducing overall volume.
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
Enables independent adjustment of output voltages and flexible power distribution across different output ports, meeting the requirements of USB PD type-C and other interfaces while minimizing volume and cost.
Implementation Method 1
a transformer, including a primary winding and a secondary winding
Data Source
AI summary
A power adapter, includes: a transformer, including a primary winding and a secondary winding; a primary circuit, including a primary main switch, electrically coupled to the primary winding; a secondary circuit, including a first switch unit and a second switch unit; a first end of the first switch unit and a first end of the second switch unit are coupled to the secondary winding of the transformer, and a second end of the first switch unit and a second end of the second switch unit connected to a first output port and a second output port, respectively; a control circuit, configured to detect output voltages of the first output port and the second output port, and controlling the primary main switch, the first switch unit and the second switch unit to adjust the output voltages of the first output port and the second output port.