US 7,746,024 B2Granted

Electric engine start system with active rectifier

AssigneeHamilton Sundstrand Corporation

InventorsGregory I. Rozman, Thomas A. Duclos

Life of this patent

Estimating the term…

Loading patent…

Abstract

A power converter includes a PWM active rectifier and controller that minimize harmonic ripple currents on the DC link during an engine start mode (first stage) in which power is provided to an AC starter motor. The PWM active rectifier and controller also minimize harmonic currents on AC input lines during a second stage (active filter mode). The power converter also includes a PWM inverter and corresponding inverter controller that controls the performance of the AC starter motor during the first stage based on mode selection input received. The power converter system further includes pre-charge circuitry that charges a DC link capacitor located within the power converter system to a desired level prior to providing the power converter system with AC power.

Claims4

Dependent claims

An electric engine start system comprising:

alternating current (AC) input lines for carrying AC power;
a capacitor connected to each AC input line for measuring current and voltage on that AC input line;
a pulse width modulation (PWM) rectifier connected to the AC input lines;
a direct current (DC) link capacitor connected to the PWM rectifier;
a PWM inverter connected to the DC link capacitor for converting DC power provided by the PWM rectifier to AC power provided to an AC motor;
a PWM rectifier controller that controls the PWM rectifier to minimize harmonics at the DC link capacitor in a first mode in which power is provided to the AC motor, and controls the PWM rectifier to minimize harmonics on the AC input lines in a second non-motoring mode based on present voltage and current values measured on each of the AC input lines.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/369,676Filed 7 Mar 2006
Published: US 2007/0216343 A120 Sep 2007
Granted: 29 Jun 2010
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

H02M 1/12
Details of apparatus for conversion: arrangements for reducing harmonics from AC input or output
H02M 1/15
Arrangements for reducing ripples from DC input or output: using active elements
H02M 5/4585
Using semiconductor devices only: having a rectifier with controlled elements
H02P 9/30
Using discharge tubes or semiconductor devices: using semiconductor devices

Family

US 2007/0216343 A1Pre-grant publication · published 20 Sep 2007
US 7,746,024 B2This patent

From the US filing history. Foreign family members aren’t listed.

Timeline

Citations

Open elsewhere

Building an agent or pulling many patents? Use the API or MCP server instead of scraping pages. Get an API key