JOEL A DONAHUE
Engineering in Brookfield, MA
License number
Massachusetts 12979
Issued Date
Sep 28, 1990
Type
Engineer in Training
Address
Address
Brookfield, MA 01506
Professional information
Method And Apparatus For Controlling The Power Supply Of A Laser Operating In A Pulse Mode
US Patent:
5142544, Aug 25, 1992
Filed:
Sep 9, 1991
Appl. No.:
7/757256
Inventors:
Joel A. Donahue - Brookfield MA
Alan M. Neech - Yorkshire, GB2
Alan M. Neech - Yorkshire, GB2
Assignee:
Coherent, Inc - Palo Alto CA
International Classification:
H01S 300
US Classification:
372 38
Abstract:
An electronics controller for controlling the power supply of a laser operating in a pulse mode is disclosed. The power supply is of the type having resonant DC converter, charging a capacitive storage means with an inverter stage driving the laser discharge tube. The current supplied to the laser discharge tube is monitored. In addition, the voltage of the capacitive storage means is also measured. Set points for the current, the voltage, and on/off are provided to the electronics controller as the comparison points for the controller. Based upon the voltage and current detected, and the set points provided, the controller controls the on/off of the converter and its frequency, and the on/off of the inverter.
Method And Apparatus For Controlling The Power Supply Of A Laser Operating In A Pulse Mode
US Patent:
5048033, Sep 10, 1991
Filed:
Sep 4, 1990
Appl. No.:
7/577875
Inventors:
Joel A. Donahue - Brookfield MA
Alan M. Neech - Yorkshire, GB2
Alan M. Neech - Yorkshire, GB2
Assignee:
Coherent, Inc. - Palo Alto CA
International Classification:
H01S 300
US Classification:
372 38
Abstract:
An electronics controller for controlling the power supply of a laser operating in a pulse mode is disclosed. The power supply is of the type having a resonant DC converter, charging a capacitive storage means with an inverter stage driving the laser discharge tube. The current supplied to the laser discharge tube is monitored. In addition, the voltage of the capacitive storage means is also measured. Set points for the current, the voltage, and on/off are provided to the electronics controller as the comparison points for the controller. Based upon the voltage and current detected, and the set points provided, the controller controls the on/off of the converter and its frequency, and the on/off of the inverter.
Dc-To-Dc Converter Using Scrs With Natural Commutation
US Patent:
5216683, Jun 1, 1993
Filed:
Nov 13, 1991
Appl. No.:
7/792039
Inventors:
Joel A. Donahue - Brookfield MA
Assignee:
Coherent, Inc. - Palo Alto CA
International Classification:
H01J 300
US Classification:
372 38
Abstract:
A DC-to-DC converter using an SCR bridge receives a first DC power signal and generates a current pulse train in response thereto. The current pulse train is supplied to a rectifying bridge which generates the second DC power signal in response thereto. A single capacitor means is placed between the leads of the output rectifier bridge to aid the commutation of the SCR bridge.