The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 20, 1996
Filed:
Dec. 17, 1993
Kuok Y Ling, Coppell, TX (US);
William Krenik, Garland, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A switching scheme for driving a three-phase DC motor includes a first end of a first coil 20 coupled to a first end of a second coil 22 and a first end of a third coil 24. A first high side transistor 32 is coupled between a voltage source and a second end of the first coil 20. A second high side transistor 34 is coupled between the voltage source and a second end of the second coil 22. A third high side transistor 36 is coupled between the voltage source and a second end of the third coil 24. A first low side transistor 38 is coupled between the second end of the first coil 20 and a resistor 56. A second low side transistor 40 is coupled between the second end of the second coil 22 and the resistor 56. A third low side transistor 42 is coupled between the second end of the third coil 24 and the resistor 56. An output of a first low side driver 26 is coupled to a gate of the first low side transistor 38. An output of a second low side driver 28 is coupled to a gate of the second low side transistor 40. An output of a third low side driver 30 is coupled to a gate of the third low side transistor 42. A low side reference voltage is coupled to a first input of each of the three low side drivers 26, 28, and 30. The resistor 56 is coupled to a second input of each of the low side drivers 26, 28, and 30. Pre-charge circuitry 64 is coupled to the output of each of the three low side drivers 26, 28, and 30. The pre-charge circuitry 64 provides a pre-charge signal to each of the three low side drivers 26, 28, and 30.