High-efficiency H-bridge circuit using switched and linear stages
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United States of America Patent
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Nov 26, 2002
Grant Date -
Jul 11, 2002
app pub date -
Aug 27, 2001
filing date -
Nov 30, 2000
priority date (Note) -
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Abstract
An H bridge regulating system for driving an electric load includes a linear output stage and switch mode output stage connected to opposite ends of the load. The linear output stage has a linear mode amplifier and a feedback circuit, and its amplifier generates a first output signal tied to one end of the load. This output voltage is passed through a conditioning resistor to an inverting input of the linear mode amplifier. The switch mode output stage has a switch mode amplifier and a feedback circuit, and its amplifier generates a second output signal tied to the other end of the load. Its voltage signal is passed through a second conditioning resistor to an inverting input of the switch mode amplifier. Other feedback circuit elements are also provided to create three distinct regions of operations for each of the amplifiers. Due to this novel arrangement for an H bridge circuit, and this novel method of operation involving three distinct regions of operation for the linear mode and switch mode output stages, very high power-saving energy efficiencies are achieved. In addition, H bridge systems for three terminal electrical devices such as three-phase electric motors are disclosed.
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