Power Converter Controller with Startup Current Clamping
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Solution Overview
Problem
Existing power converter controllers face challenges in reducing switching loss and manufacturing costs due to cumbersome packaging processes and high leakage currents, particularly in integrating high voltage startup circuits and power switches.
Innovation Solution
A controller design that integrates a startup and pulse control circuit, power switch, and clamping circuit on a single chip, utilizing MOSFETs and detection resistors to clamp currents and reduce switching loss, while maintaining efficient current detection and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If individually made chips are integrated into a package, then functionality is achieved, but manufacturing cost increases and packaging process becomes cumbersome
Solution Approach 1:
The patent merges the high voltage startup circuit, high voltage power switch, and current sensing resistor into a single integrated chip structure. This consolidation eliminates the need for separate packaging of individual chips, thereby reducing manufacturing cost and simplifying the packaging process while maintaining all required functionalities.
2Loss of energy
If a resistor is connected in series with drain and gate of the high voltage startup circuit, then manufacturing cost is reduced, but leakage current increases causing higher switching loss
Solution Approach 1:
The patent changes the electrical parameters of the startup circuit by integrating the current sensing resistor directly into the chip structure with optimized resistance values. This integration allows for precise control of the resistor parameters, reducing leakage current and switching loss while maintaining manufacturing cost effectiveness through a streamlined fabrication process.
3Loss of energy
If the startup circuit is turned on, then power conversion is enabled, but current flowing through the startup circuit causes switching loss
Solution Approach 1:
The patent introduces a clamping circuit as an intermediary component that actively controls the current flow through the startup circuit. This clamping circuit limits the current to an optimal range, reducing switching loss while ensuring sufficient current is maintained for effective power conversion, thus resolving the trade-off between energy loss and productivity.
Data Source
AI summary
A controller applied to a power converter includes a startup and pulse control circuit, a power switch, a startup circuit, and a clamping circuit. The power switch is coupled to a primary side of the power converter and the startup and pulse control circuit, and turned on according to a gate control signal generated by the startup and pulse control circuit. The startup circuit is coupled to the primary side of the power converter, the startup and pulse control circuit and the power switch, and turned on according to a startup signal generated by the startup and pulse control circuit. The clamping circuit is coupled to the startup and pulse control circuit and the power switch, and clamps a current flowing through the startup circuit when the startup circuit is turned on.