Daniel T Welsh

US Patent:

56358164, Jun 3, 1997

Filed:

Aug 1, 1995

Appl. No.:

8/509743

Inventors:

Daniel Welsh - Solana Beach CA
Kenneth F. Gerken - Brookeville MD

Assignee:

Morningstar Corporation - Olney MD

International Classification:

H01M 1044
H01M 1046

US Classification:

320 21

Abstract:

An automatic photovoltaic controller provides a fixed frequency, pulse width modulated charging current to charge and regulate a battery, the duty cycle of the charging current being controlled by the difference between the sensed battery voltage and a desired regulated voltage. Modulation is achieved by controlling the on and off states of plural parallel-connected FET switches placed in series between the photovoltaic array and the battery. The duty cycle is adjustable in discrete steps over the entire range of 0% to 100% and is updated numerous times per second with new battery voltage measurements to provide highly accurate regulation. The charge current pulse rise time is selected to match the response time of the photovoltaic array. The fixed frequency of the charge current is within the preferred range of 100 Hz to 600 Hz to provide sufficient time for the chemical reaction within the battery cells to be substantially completed between charge pulses during the regulation mode. Automatic protection of the controller and the load is achieved by rapidly disconnecting the battery and/or load in response to specified conditions.

US Patent:

20220226046, Jul 21, 2022

Filed:

Jun 4, 2020

Appl. No.:

17/613249

Inventors:

- Carisbad CA, US
Wesley D. JONES - Oceanside CA, US
Marcus Frederick JULIAN - Vista CA, US
Daniel WELSH - Encinitas CA, US
Ragnar OLAFSSON - San Diego CA, US
Steven Anthony YON - San Diego CA, US
Derrick Ren-yu CHOU - San Diego CA, US
Michael C. OLIVEIRA - San Marcos CA, US
Jun SONG - San Diego CA, US
Ahmad FALAHATPISHEH - San Marcos CA, US
Timothy J. CORVI - San Diego CA, US
Graydon Ernest BEATTY - Carlsbad CA, US
Alexander J. ASCONEGUY - Murrieta CA, US
Hongping DAI - Vista CA, US

International Classification:

A61B 34/20
A61B 5/06
A61B 18/14

Abstract:

Provided herein are systems and methods for performing localization within a patient. A method of localization within a body comprises providing at least one processor coupled to at least one data storage device, establishing and calibrating a localization coordinate system within a body by executing a first localization mode by the at least one processor, recalibrating the localization coordinate system by executing a second localization mode by the at least one processor, and localizing a device within the localization coordinate system using the first localization mode and the second localization mode, by the at least one processor. The first localization mode can be an impedance-based localization mode and the second localization mode can be magnetic-based localization mode, or vice versa.

US Patent:

20200015876, Jan 16, 2020

Filed:

Oct 11, 2017

Appl. No.:

16/335893

Inventors:

- Carlsbad CA, US
Marcus Frederick JULIAN - Vista CA, US
Steven Anthony YON - San Diego CA, US
Randell L. WERNETH - Eagle ID, US
Alexander HIGGINS - San Diego CA, US
Ricardo ROMAN - Chula Vista CA, US
Alexander J. ASCONEGUY - Murrieta CA, US
Christoph SCHARF - Horgen, CH
Dennis O'BRIEN - Oceanside CA, US
Rob Andre PESCAR - San Diego CA, US
Ahmed FALAHATPISHEH - San Marcos, US
Tom ESBECK - Carlsbad CA, US
Gerald M. STOBBS III - Alpine CA, US
Leo MARIAPPAN - Oceanside CA, US
James Calvin ALLAN - Boise ID, US
Michael C. OLIVEIRA - San Marcos CA, US
Daniel WELSH - Encinitas CA, US
R. Maxwell FLAHERTY - Topsfield MA, US
J. Christopher FLAHERTY - Auburndale FL, US

International Classification:

A61B 18/00

Abstract:

An ablation system comprises: an ablation catheter and a console. The ablation catheter comprises: a shaft including a proximal end, a distal portion and a distal end; an ablation element configured to deliver energy to tissue; and a force maintenance assembly comprising a force maintenance element and configured to control and/or assess contact force between the ablation element and cardiac tissue. The console is configured to operably attach to the ablation catheter and comprises: an energy delivery assembly configured to provide energy to the ablation element. Methods of ablating tissue are also provided.