Converter Driving Circuit With Boosted MOSFET Gate Supply
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Solution Overview
Problem
Traditional non-isolated power supply systems face inefficiencies and high power loss due to insufficient internal power supply voltage for high-power MOS transistors, and adding extra windings increases complexity and cost.
Innovation Solution
A voltage conversion circuit with a switching power supply chip, a boost unit, and an auxiliary power supply capacitor, where the internal power supply boosts the voltage when needed to drive the power MOS transistor, reducing power loss and assembly costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a traditional self-powered structure is used to generate internal power supply through high-voltage input, then the internal power supply voltage is increased to drive high-power MOS transistor, but the efficiency is low and power loss is high
Solution Approach 1:
The patent implements a dynamic power supply switching mechanism that automatically selects between internal power supply (when voltage is sufficient) and external power supply (when voltage is insufficient). This dynamic adaptation resolves the contradiction by avoiding the high power loss of traditional self-powered structures while maintaining the capability to drive high-power MOS transistors when needed.
Solution Approach 2:
The patent introduces a voltage detection module and control module as intermediaries between the power supply system and MOS transistor. These intermediaries detect the voltage status and intelligently switch between power supply sources, eliminating the need for inefficient traditional self-powered structures while ensuring adequate driving voltage when required.
2Power
If a winding with turn ratio 1:N is used to increase output voltage and feed back to chip, then the internal power supply voltage is increased to drive high-power MOS transistor, but an extra winding is added resulting in more complex structure and higher assembly cost
Solution Approach 1:
The patent extracts and removes the unnecessary extra winding from the traditional solution. By using a voltage detection module to monitor the internal power supply voltage and intelligently switching between internal and external power supplies, the patent achieves the same functional result without adding structural complexity or assembly cost.
Solution Approach 2:
The patent implements a self-service mechanism where the voltage detection module automatically monitors the internal power supply voltage and the control module autonomously switches between power supply sources. This eliminates the need for complex external windings and manual voltage regulation, simplifying the overall structure while maintaining the capability to drive high-power MOS transistors.
3Device complexity
If internal power supply voltage is used to drive high-power MOS transistor, then the structure is simple, but the internal power supply voltage is insufficient to drive the transistor
Solution Approach 1:
The patent transforms the static internal power supply into a dynamic system that can adapt its voltage output based on demand. The voltage detection module monitors whether the internal power supply voltage is sufficient, and the control module dynamically switches between internal and external power supplies, ensuring adequate driving voltage for high-power MOS transistors while maintaining structural simplicity.
Solution Approach 2:
The patent makes the power supply system multi-functional by enabling it to operate in two modes: using internal power supply when voltage is sufficient (maintaining simplicity) and switching to external power supply when voltage is insufficient (ensuring adequate driving capability). This universal approach resolves the contradiction between structural simplicity and driving voltage sufficiency.
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 provides a high-efficiency, low-power-loss, and simple-structure non-isolated power supply system by generating boosted voltage internally to drive the power MOS transistor, improving power supply capability and reducing assembly costs.
Implementation Method 1
a boost unit, wherein when an output voltage of the boost unit is less than a working voltage of the driving circuit, an internal power supply of the switching power supply chip provides the working voltage for the driving circuit; and when the output voltage of the boost unit reaches the working voltage of the driving circuit, the output voltage of the boost unit provides the working voltage for the driving circuit
Data Source
AI summary
A voltage conversion circuit and a non-isolated power supply system are provided. The voltage conversion circuit includes: a switching power supply chip which includes a power MOS transistor and a driving circuit, where the driving circuit is adapted to drive the power MOS transistor; and a driving circuit power supply unit which includes a boost unit, wherein when an output voltage of the boost unit is less than a working voltage of the driving circuit, an internal power supply of the switching power supply chip provides the working voltage for the driving circuit; and when the output voltage of the boost unit reaches the working voltage of the driving circuit, the output voltage of the boost unit provides the working voltage for the driving circuit.