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:
Jan. 14, 1997
Filed:
Oct. 03, 1994
Alfred H Barrett, Carmel, IN (US);
Delco Electronics Corporation, Kokomo, IN (US);
Abstract
An AC/DC harmonic neutralizing power converter. The power converter includes a first rectifier, load output terminals for delivering DC power to a load, and a harmonic neutralizing converter. The first rectifier includes an input to receive AC input power and an output. The harmonic neutralizing converter comprises a power switching inverter and a second rectifier. The power switching inverter includes an input connected to the output of the first rectifier, an LC resonant circuit, and an output. The second rectifier of the harmonic neutralizing converter has an input connected to the output of the inverter and an output connected in voltage additive relationship to the output of the first rectifier. The added outputs of the rectifiers is connected to the load output terminals such that the output voltage on the load output terminals substantially equals the added output voltages of the rectifiers. In this manner, the power converter draws from the power source substantially sinusoidal current of a frequency substantially equal to the frequency of the input signal provided by the AC power source. Various embodiments are also illustrated in which the power converter is controlled without modifying the operating frequency of the resonant circuit of the power switching circuit. This may be accomplished by inclusion of an additional output stage, a bootstrap circuit, and use of a controlled-K resonant transformer in the series resonant circuit. By using series resonant topology within the harmonic neutralizing power converter, harmonic neutralization is accomplished using a topology which is inherently advantageous over pulse width modulation power converters.