This chapter presents a two-channel current source driver (CSD) with the continuous current, which can provide two symmetrical drive signals for driving two metal oxide semiconductor field-effect transistors (MOSFETs). The proposed drive circuit can recover most of the driving energy. It can also reduce the switching loss significantly. The proposed CSD can be used to drive the synchronous rectifier (SR) in a current doubler or full-wave rectifier. It can also be used to drive the primary MOSFETs in push-pull converters.

Chapter Contents:

• 3.1 Two-channel low-side continuous current source drivers
• 3.1.1 Operating principle
• 3.1.2 Loss comparison
• 3.1.3 Advantages of the proposed current source driver
• 3.1.3.1 Gate-drive loss saving
• 3.1.3.2 Switching loss reduction
• 3.1.3.3 Body diode conduction time reduction
• 3.1.3.4 High noise immunity and alleviation of dv/dt effect
• 3.1.3.5 Less impact of parasitic inductance
• 3.1.4 Applications
• 3.1.5 Experimental results
• 3.2 High-side and low-side continuous current source drivers
• 3.2.1 Operating principle of proposed current source drivers
• 3.2.2 Advantages
• 3.2.3 Loss analysis
• 3.2.4 Experimental results
• 3.3 Accurate switching loss model with current source drivers
• 3.3.1 Proposed MOSFET loss model with current source resonant driver
• 3.3.1.1 Circuit and basic assumption
• 3.3.1.2 Analytical modeling of main switching transition
• 3.3.2 Analytical modeling and simulation results
• 3.3.3 Proposed optimal design with the accurate switching loss model
• 3.3.4 Experimental verification and discussion
• 3.4 High-side and low-side current source drivers
• 3.4.1 Problem of high-side and low-side current source drivers
• 3.4.2 Proposed decoupled high-side and low-side current source drivers
• 3.4.2.1 Principle of operation
• 3.4.2.2 Advantages of proposed current-source gate driver
• 3.4.2.3 Drive circuit design analysis
• 3.4.2.4 Optimal design
• 3.4.2.5 Application extension
• 3.4.3 New current-source gate driver with integrated magnetics
• 3.4.4 Experimental results and discussion
• 3.5 Summary
• References

Inspec keywords: rectifying circuits; MOSFET; switching convertors; driver circuits; constant current sources

Other keywords: two-channel current source driver; MOSFET; current doubler; symmetrical drive signals; two-channel CSD; drive circuit; continuous current source driver; full-wave rectifier; metal oxide semiconductor field-effect transistors; synchronous rectifier; switching loss reduction; push-pull converters; driving energy recovery

Subjects: Insulated gate field effect transistors; Power electronics, supply and supervisory circuits