Pulse width modulated controller for high temperature power conversion
US6101106A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 5, 1999 |
| Grant date | Aug 8, 2000 |
| Priority date | — |
| Expiry date | Feb 5, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/1557
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A pulse width modulated (PWM) controller for high temperature power conversion application is disclosed. The controller includes following functional blocks. A bias generator (10) establishes a stable operating point with Zero- Temperature-Coefficient (ZTC) over operating temperatures and supply voltage variations. An oscillator (13) using the same bias resistor for the bias generator (10), produces a precision time base for the PWM operation. A temperature compensated error amplifier (20) forms a closed loop regulation of a power converter. Three voltage comparators (18,33,37) provide direct coupled current mode control, current limit protection and under voltage lock-out functions. A latch (30) engages the PWM pulses to an output select circuit (21) for user configurable single-ended or double-ended switching topology. An on shot discharge circuit (26) triggered by the under voltage lock-out comparator (37) allows for proper start-up during input voltage transient. Five voltage buffers (11,12,16,35,36) with fixed gain setting provide temperature stabilized voltage thresholds for the oscillator (13) and the comparator (18,33,37). Soft start is accomplished by controlling the inver…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.