Synchronous Power Converter Using PFETs for Multiple Outputs
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Solution Overview
Problem
Existing multiple output DC-DC power converters face inefficiencies due to significant switching losses in n-channel field-effect transistors (NFETs) and require multiple non-isolated regulation stages, leading to increased complexity and cost.
Innovation Solution
A synchronous power converter design that utilizes p-channel field-effect transistors (PFETs) and PFETs in conjunction with NFETs, implementing synchronized switching and modulation techniques to reduce switching losses and achieve efficient regulation of multiple outputs without the need for additional inductors, leveraging the transformer's leakage inductance for voltage control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If n-channel field-effect transistors (NFETs) are used in multiple output DC-DC power converters, then the converter can provide multiple regulated DC outputs, but significant switching losses occur
Solution Approach 1:
The patent inverts the conventional approach by using p-channel NFETs instead of n-channel NFETs for the secondary side switching elements. This inversion allows the switching elements to operate in a region where switching losses are significantly reduced, while still achieving the required power conversion capability for multiple regulated DC outputs.
Solution Approach 2:
The patent changes the electrical parameters of the switching elements by selecting p-channel NFETs with specific threshold voltages and transconductance characteristics. This parameter change enables the switching elements to operate more efficiently, reducing switching losses while maintaining the ability to regulate multiple DC outputs.
2Measurement precision
If multiple non-isolated regulation stages are deployed for each DC output, then accurate voltage regulation is achieved, but device complexity increases
Solution Approach 1:
The patent makes the secondary side switching elements serve multiple functions: they simultaneously regulate multiple DC outputs and provide isolation functionality. This multi-functionality eliminates the need for separate non-isolated regulation stages for each output, reducing device complexity while maintaining voltage regulation accuracy through synchronized switching control.
Solution Approach 2:
The patent merges the regulation functions for multiple DC outputs into a single synchronized switching control mechanism. By combining the control of multiple outputs through a unified switching scheme, the system achieves accurate voltage regulation without requiring separate regulation stages, thereby reducing overall device complexity.
3Measurement precision
If additional inductors are added for each output regulation stage, then output regulation is improved, but manufacturing cost increases
Solution Approach 1:
The patent makes the transformer's leakage inductance serve the dual function of magnetic coupling for power transfer and voltage regulation for multiple outputs. This eliminates the need for additional discrete inductors at each output stage, reducing component count and manufacturing cost while maintaining effective output voltage regulation through the synchronized switching mechanism.
Solution Approach 2:
The patent enables the transformer's inherent leakage inductance to self-perform the regulation function that would otherwise require additional inductors. By utilizing the existing magnetic component's parasitic elements for useful regulation purposes, the system avoids the need for extra inductors, thereby reducing manufacturing complexity and cost.
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 reduces switching losses and simplifies the regulation process, enabling efficient and cost-effective multiple output power conversion with improved efficiency and reduced component requirements.
Implementation Method 1
leveraging the transformer's leakage inductance for voltage control
Implementation Method 2
A synchronous power converter design that utilizes p-channel field-effect transistors (PFETs) and PFETs in conjunction with NFETs
Data Source
AI summary
A multiple output power converter constituted of: an inductance element arranged, responsive to a switching circuit to receive power and arranged to output a function of the received power for a predetermined time period, the secondary side exhibiting a predetermined voltage during the predetermined time period; a control circuitry arranged to switch the switching circuit so as to maintain a first output at a predetermined level; a second output; and an electronically controlled switch arranged to be alternately in a closed state and an open state, the second output arranged to receive or not receive a portion of the output power responsive to the state, the switch set in synchronization with the switching circuit.