SERIES INVERTER CIRCUIT WITH TIMING RESPONSIVE TO REFLECTIVE CURRENTT
Assignee
CANDELA CORPORATION, A CORP. OF MASSACHUSETTS
Filed
Nov 24, 1982
Granted
Mar 3, 1987
Location
NATICK MA US
Abstract
A series inverter, high voltage capacitor charging circuit includes current sensors for sensing the current through each SCR in the circuit. The sensed current is used to vary the gating frequency of the SCRs and to preclude firing of an SCR until the other is in a stable off condition. The gating of each SCR is delayed by an amount of time determined by a control capacitor charging circuit. That charging circuit is inhibited as long as one of the SCRs is conducting and once the load voltage has reached a predetermined level. The time constant of that charging circuit can be changed as the desired level is approached of if insufficient reverse bias is applied to an SCR for quick turn-off of the SCR. Resolution of the system can be increased by a shunt regulator which shorts the output transformer. The circuit can be disabled if the high voltage capacitor does not reach its set level within a given time.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
Apr 11, 1984
Rescinded
Jul 10, 1984
Duration
3 months
Inventor
- 1GEORGE L. BEES
Record Details
- Patent number
- US 4647830
- Application
- 06444213
- Aerospace match
- No
- Dataset source
- 35 USC §181 SO records