Stable and reliable-operation heavy-current low-pressure drop one-way conducting circuit

Abstract

The invention discloses a stable and reliable-operation heavy-current low-pressure drop one-way conducting circuit, which is used for improving the performance of a rectifying device. The conducting circuit consists of a metal oxide semiconductor field effect transistor (MOSFET) in which a parasitic diode is arranged, a Darlington transistor and a resistor, wherein an emitter of a first Darlington transistor is connected with a source of the MOSFET through a first resistor; a collector of the first Darlington transistor is connected with a grid of the MOSFET; a collector of a second Darlington transistor is connected with a drain of the MOSFET; a base of the first Darlington transistor and a base of the second Darlington transistor are in short circuit connection with an emitter of the second Darlington transistor and then are connected with a positive pole of a driving power supply through a second resistor; and the grid of the MOSFET is connected with the positive pole of the driving power supply through a third resistor. Compared with a traditional control circuit, the conducting circuit ensures that four operational amplifiers are replaced by two Darlington transistors, and has the advantages of simple structure, low cost, high response speed, reaction time in a nanosecond grade, no reverse current and stable and reliable work.

Description

technical field [0001] The invention relates to a unidirectional conduction (electronic diode) circuit with high current and low voltage drop made by using power MOSFET, which belongs to the technical field of electrical components. Background technique [0002] With the development of power electronics technology, various electronic devices have higher and higher requirements for power supply and higher current requirements, especially the application of large-scale integrated circuits is developing in the direction of low voltage and high current. . In modern power electronics technology, low-voltage high-current diodes are widely used to realize various functions, such as: rectification, DC isolation, etc. As the operating current increases, the conduction voltage drop of the diode becomes one of the main bottlenecks restricting the improvement of the efficiency of the whole machine. Generally, the conduction voltage drop of a large current rectifier diode is about 0.7V ...

AI Technical Summary

Problems solved by technology

However, due to the bidirectional conduction characteristics of the power MOSFET, a control circuit must be added when the power MOSFET is used for rectification. However, the existing MOSFET control circuit has a complex structure and requires many devices. Generally, four operational amplifiers and surrounding devices are required. About twenty, not only the cost is high, but also the response speed of the control loop is slow. reliability

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