Turn-on controller for switch-mode regulator
US6121760A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 17, 1994 |
| Grant date | Sep 19, 2000 |
| Priority date | — |
| Expiry date | Mar 17, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/157
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A switch-mode power regulator includes a turn-on controller 52 to limit, during a fixed period of time, the initial current passing through the regulator following turn-on. During this time period the storage elements of the regulator must achieve an acceptable level of stability without excessive current flow. Turn-on controller 52 comprises a divider 72 which clocks zeroes along the length of a shift register 74 which is initially preset to all ones. The outputs of the shift register are coupled to a decoder 76, whose input signals are sequentially steered to its output under the control of a counter 70. The output signal from decoder 76 functions as the power regulator switching signal from turn-on controller 52. Counter 70 cycles many times for each data shift of shift register 74. Thus, turn-on controller 52 generates a train of negative pulses which increase in length monotonically for the duration of the sequence. In one embodiment, the first two data inputs of decoder 76 are grounded, thereby providing a fixed minimum pulse width at the onset of the sequence. In another embodiment, the last two data inputs of decoder 76 are tied to logic supply voltage, thereby preventing c…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.