Switch Power Supply Circuit Driving Current via Inductor Core
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Solution Overview
Problem
The high cost of switch power supply systems is attributed to the need for an additional energy storage capacitor to provide sufficient driving current to the power switch transistor, which increases system expenses.
Innovation Solution
A switch power supply circuit design that includes a step-down transistor, a control module, and multiple switch transistors, where the second switch transistor is directly coupled with the input voltage to obtain sufficient driving current for the power switch transistor, eliminating the need for an additional energy storage capacitor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an additional energy storage capacitor is connected to the power supply pin of the switch power supply chip, then sufficient driving current is provided to the gate of the power switch transistor, but the cost of the switch power supply system increases
Solution Approach 1:
The patent extracts the energy storage function from a separate capacitor component and integrates it into the existing inductor structure through a shared magnetic core. The inductor's magnetic core serves dual purposes: energy storage for the power conversion circuit and energy storage for providing driving current to the power switch transistor gate, thereby eliminating the need for an additional energy storage capacitor and reducing system cost.
Solution Approach 2:
The patent implements multi-functionality by designing the inductor's magnetic core to serve multiple functions simultaneously: it acts as the energy storage element for the power conversion circuit and also provides the necessary energy storage for driving the power switch transistor gate. This universal design allows one component to fulfill multiple roles, eliminating the need for separate dedicated energy storage capacitors.
2Reliability
If an additional energy storage capacitor is connected to provide driving current, then the power switch transistor can be driven reliably, but the system becomes more complex and expensive
Solution Approach 1:
The patent merges the energy storage functions of what would traditionally require separate components (inductor and energy storage capacitor) into a single integrated structure. The inductor's magnetic core is designed to provide both the energy storage needed for power conversion and the additional energy storage required for driving the power switch transistor, combining multiple functions into one component.
Solution Approach 2:
The inductor's magnetic core is designed as a universal energy storage element that serves multiple purposes: it stores energy for the power conversion circuit operation and simultaneously provides the necessary energy storage for driving the power switch transistor gate reliably, reducing the total number of components needed.
Data Source
AI summary
The present disclosure provides a switch power supply circuit, which includes a step-down transistor, a control module, a first switch transistor, a second switch transistor, a third switch transistor, and a power switch transistor. In the switch power supply circuit of the present disclosure, the first terminal of the second switch transistor is directly coupled with the input voltage, and the second switch transistor can directly obtain sufficient driving current from the input voltage to drive the power switch transistor. The present application can ensure the reliability and efficiency of the system without an additional energy storage capacitor, which reduces the costs of the system.