Rectifier Compensation Circuit for MOSFET Parasitic Inductance
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Solution Overview
Problem
The parasitic inductance on the pins of the synchronous rectification MOSFET in display apparatus rectifier circuits affects the accuracy of voltage drop detection, leading to improper timing control and increased heating and loss in the MOSFET.
Innovation Solution
A compensation circuit with an electromagnetic induction coil is introduced in the closed loop of the rectifier circuit, generating a compensation signal based on the closed loop current to counteract the parasitic signal from the MOSFET pins, improving voltage drop detection accuracy and reducing MOSFET heating and loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If synchronous rectification MOSFET is used in rectifier circuit, then rectification efficiency is improved, but parasitic inductance on pins causes voltage drop detection inaccuracy
Solution Approach 1:
An electromagnetic induction coil is introduced as an intermediary component in the rectifier circuit. The coil generates a compensation signal that mediates the effect of parasitic inductance on voltage drop detection, allowing accurate measurement despite the presence of parasitic elements in the MOSFET pins.
Solution Approach 2:
The electromagnetic induction coil provides preliminary anti-action by generating a compensation signal that counteracts the parasitic inductance effect before it corrupts the voltage drop detection. This preemptive compensation ensures accurate timing control signals are generated despite the inherent parasitic inductance in the MOSFET structure.
2Measurement precision
If voltage drop detection accuracy is maintained, then MOSFET timing control is precise, but parasitic inductance causes heating and loss increase
Solution Approach 1:
The electromagnetic induction coil creates a feedback mechanism where the compensation signal is continuously generated based on the actual current flow through the MOSFET. This feedback loop ensures that the timing control signals remain precise while the compensation continuously counteracts parasitic effects, preventing excessive heating and energy loss.
3Measurement precision
If electromagnetic induction coil is added for compensation, then voltage drop detection accuracy is improved, but device complexity increases
Solution Approach 1:
The electromagnetic induction coil serves multiple functions simultaneously: it generates the compensation signal for parasitic inductance, provides timing reference information, and enables accurate voltage drop detection. This multi-functionality reduces the need for separate compensation circuits, thereby limiting the increase in overall device complexity.
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 compensation circuit enhances the accuracy of voltage drop detection, allowing for precise control of the synchronous rectification MOSFET, thereby reducing heating and loss, and improving the overall efficiency of the rectifier circuit.
Implementation Method 1
the compensation circuit includes: an electromagnetic induction coil placed in the closed loop of the rectifier circuit; the electromagnetic induction coil is configured to generate a compensation signal based on a closed loop current in the closed loop
Data Source
AI summary
A display apparatus and a compensation circuit are provided. The display apparatus includes a display screen, a sound reproduction device and a power supply circuit. The power supply circuit includes a rectifier circuit and a compensation circuit. The rectifier circuit is used to convert an alternating current to a direct current. The compensation circuit is used to compensate for a parasitic signal of a synchronous rectification MOSFET in the rectifier circuit, thereby reducing heat generated by the MOSFET.