MOS Transistor Diode Circuit for Low Voltage Drop
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Solution Overview
Problem
Conventional silicon diodes in switching converters experience significant power loss due to their forward voltage drop, and existing semiconductor switch solutions, like MOS transistors, require complex driving circuits and may have slow switching speeds, making them unsuitable for high-frequency applications.
Innovation Solution
An integrated circuit with a MOS transistor and a diode in parallel, driven by a detector circuit and a driver circuit with a main and feedforward branch, which generates control signals and currents to manage the MOS transistor's gate voltage, allowing it to mimic diode behavior with reduced forward voltage and simplified driving requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a silicon diode is used to replace a controlled semiconductor switch, then the circuit complexity is reduced and ease of operation is improved, but the forward voltage drop increases causing significant power loss
Solution Approach 1:
The patent combines a MOS transistor and a diode in parallel configuration within a single integrated circuit. The MOS transistor handles the main current flow with low voltage drop, while the diode provides a defined forward voltage characteristic. This merging allows the device to achieve both low power loss and simplified circuit operation, as the two components work together to provide the benefits of both transistor and diode operation.
2Loss of energy
If a MOS transistor is used to replace a silicon diode, then power loss is reduced due to lower forward voltage, but the device requires a complex driver circuit and has slow switching speed
Solution Approach 1:
The parallel combination of MOS transistor and diode eliminates the need for complex external driver circuits. The diode's inherent characteristics provide automatic control, while the MOS transistor executes the switching action. This integration simplifies the overall device structure and reduces switching time, as the MOS transistor can switch rapidly without requiring complex external driving signals.
Solution Approach 2:
The diode in the parallel configuration provides self-control functionality, eliminating the need for external driver circuits. The diode's forward voltage characteristic automatically controls the gate of the MOS transistor, enabling the device to regulate itself without external intervention. This self-service mechanism reduces both circuit complexity and switching time.
3Ease of operation
If an integrated device with two terminals and diode-like characteristic curve is used, then ease of operation is improved and compatibility with existing diode circuits is achieved, but the switching speed is too slow for high-frequency applications
Solution Approach 1:
The patent merges a MOS transistor with fast switching capability and a diode with defined voltage characteristics in parallel. The MOS transistor provides rapid switching response for high-frequency applications, while the diode maintains the characteristic curve similarity to conventional diodes. This combination enables the device to achieve both high switching speed and ease of operation with compatibility to existing diode circuits.
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 integrated circuit reduces power loss by minimizing voltage drop and eliminates the need for complex driver circuits, enabling efficient operation in high-frequency applications while maintaining compatibility with existing diode-based circuits.
Implementation Method 1
the feedforward branch comprises circuit components configured to generate a charging current or, alternatively, a discharging current as a reaction to a slope of the control signal, said current charging or discharging, respectively, the control electrode of the MOS transistor
Data Source
AI summary
An integrated circuit includes a transistor having a control electrode and a load current path to activate and to deactivate a load current path between a first terminal and a second terminal. A diode is in parallel with the load current path of the transistor. The integrated circuit includes a detector circuit to generate a control signal depending on a voltage between the first terminal and the second terminal. The integrated circuit includes a driver circuit having a main branch and a first feedforward branch. The main branch includes circuit components to generate a control voltage for the control electrode of the transistor in accordance with the control signal, and the feedforward branch comprises circuit components to generate a charging current or, alternatively, a discharging current as a reaction to a slope of the control signal, the current charging or discharging, respectively, the control electrode of the transistor.