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Duration: 2Ìýhours

In this module, we select a converter circuit approach for the bidirectional dc-dc converter to interface a lithium-ion battery pack to a USB load, and begin the design of the power stage components and LTspice simulation.

Duration: 1Ìýhour

In this module, we finish the design of the power stage components and the converter power stage LTspice simulation,Ìýand document the steady-state converter design for submission of Milestone 1.

Duration: 1Ìýhour

In this module, we develop an averaged model of the power converter, select a control approach (voltage mode, peak current mode, or average current mode control), and begin the design of the control loop(s) to meet requirements on crossover frequency and maximum closed-loop output impedance. We also begin development of LTspice averaged simulation of the controller design.

Duration: 1Ìýhour

This week, we complete the development of an averaged model of the power converter, its control loop(s), and an LTspice averaged simulation. We document the control circuit design for submission to Milestone 2.

Duration: 1Ìýhour

This week, we begin the development of an LTspice switching model of the closed-loop converter system, to verify that the system meets load current transient requirements. We improve theÌýdesign as necessary andÌýbegin the addition of current limiting to the circuit.

Duration: 1Ìýhour

In this module, we complete the development of an LTspice switching model of the closed-loop converter system and verify that the system meets load current transient requirements. We complete the addition of current limiting to the circuit, to prevent inductor saturation during transients. Additionally, the learner will demonstrate the final design, including operation at the specified operating points, closed-loop response to a step-change in load current, current limiting, inductor and capacitor size, and efficiency. Finally, we document the final design for submission to Milestone 3.