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The buck-boost converter is a type of DC-to-DC converter that has an output voltage magnitude that is either greater than or less than the input voltage magnitude. It is equivalent to a flyback converter using a single inductor instead of a transforrner. Two different topologies are called buck-boost converter. Both of them can produce a range of output voltages, ranging from much larger (in absolute mognitude) than the input voltage, down to almost zero. Ai, (ON)+ Ai, (OFF) -0 or40-Dr -0 1-D we've to obtain that the output is depending of the duty cycle disproportionate and also proportional. The duty cycle of the PWM can have values between 0 and 1. In this way we could achieve both higher and lower voltages than the input. That's why this configuration is called step down-up converter. The 4-switch converter combines the buck and boost converters. It can operate in either the buck or the boost mode. In either mode, only one switch controls the duty cycle, another is for commutation and must be operated inversely to the former one, and the remaining two switches are in a fixed position. A 2-switch buck-boost converter can be built with two diodes, but upgrading the diodes to FET transistor switches doesn't cost much extra while due to lower voltage drop the efficiency improves.

The buck-boost converter is a type of DC-to-DC converter that has an output voltage magnitude that is either greater than or less than the input voltage magnitude. It is equivalent to a flyback converter using a single inductor instead of a transforrner. Two different topologies are called buck-boost converter. Both of them can produce a range of output voltages, ranging from much larger (in absolute mognitude) than the input voltage, down to almost zero. Ai, (ON)+ Ai, (OFF) -0 or40-Dr -0 1-D we've to obtain that the output is depending of the duty cycle disproportionate and also proportional. The duty cycle of the PWM can have values between 0 and 1. In this way we could achieve both higher and lower voltages than the input. That's why this configuration is called step down-up converter. The 4-switch converter combines the buck and boost converters. It can operate in either the buck or the boost mode. In either mode, only one switch controls the duty cycle, another is for commutation and must be operated inversely to the former one, and the remaining two switches are in a fixed position. A 2-switch buck-boost converter can be built with two diodes, but upgrading the diodes to FET transistor switches doesn't cost much extra while due to lower voltage drop the efficiency improves.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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The buck-boost converter is a type of DC-to-DC converter that has an output voltage magnitude that is either greater than or less than the input voltage magnitude. It is equivalent to a flyback converter using a single inductor instead of a transforrner. Two different topologies are called buck-boost converter. Both of them can produce a range of output voltages, ranging from much larger (in absolute magnitude) than the input voltage, down to almost zero. Ai, (ON) + Ai, (OFF) = 0 1-D we've to obtain that the output is depending of the duty cycle disproportionate and also proportional. The duty cycle of the PWM can have values between O and 1. In this way we could achieve both higher and lower voltages than the input. That's why this configuration is called step down-up converter. The 4-switch converter combines the buck and boost converters. It can operate in either the buck or the boost mode. In either mode, only one switch controls the duty cycle, another is for commutation and must be operated inversely to the former one, and the remaining two switches are in a fixed position. A 2-switch buck-boost converter can be built with two diodes, but upgrading the diodes to FET transistor switches doesn't cost much extra while due to lower voltage drop the efficiency improves.
Transcribed Image Text:The buck-boost converter is a type of DC-to-DC converter that has an output voltage magnitude that is either greater than or less than the input voltage magnitude. It is equivalent to a flyback converter using a single inductor instead of a transforrner. Two different topologies are called buck-boost converter. Both of them can produce a range of output voltages, ranging from much larger (in absolute magnitude) than the input voltage, down to almost zero. Ai, (ON) + Ai, (OFF) = 0 1-D we've to obtain that the output is depending of the duty cycle disproportionate and also proportional. The duty cycle of the PWM can have values between O and 1. In this way we could achieve both higher and lower voltages than the input. That's why this configuration is called step down-up converter. The 4-switch converter combines the buck and boost converters. It can operate in either the buck or the boost mode. In either mode, only one switch controls the duty cycle, another is for commutation and must be operated inversely to the former one, and the remaining two switches are in a fixed position. A 2-switch buck-boost converter can be built with two diodes, but upgrading the diodes to FET transistor switches doesn't cost much extra while due to lower voltage drop the efficiency improves.
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