Pulse width modulation regulator control circuit having precise frequency and amplitude control
US6608521B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 14, 2002 |
| Grant date | Aug 19, 2003 |
| Priority date | — |
| Expiry date | May 14, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/156
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A control circuit (50) for a switch mode power converter having precise control of amplitude and frequency that does not exhibit overshoot error nor undershoot error during a fast charge cycle nor a fast discharge cycle, respectively. In a first embodiment, the control circuit (50) does not exhibit undershoot error during a fast discharge cycle. The control circuit (50) comprises an oscillator (70) for providing a periodic carrier signal comprising a sawtooth wave output signal (VST). The oscillator (70) includes a capacitor (CT2) charged and discharged to the power supply voltage (VCC) to provide the sawtooth wave output signal (VST). In addition, the oscillator (70) includes a switching circuit (65) coupled to the reference voltage level (Vref). The control circuit (50) further includes a gain circuit (64) having a reference voltage input (Vref2), voltage input (Vin) and an output (Out). The reference voltage input (Vref2) receives the reference voltage(Vref). The voltage input (Vin) connects to the capacitor (CT2). The output (Out) of the gain circuit (64) connects to the switching circuit (65) to provide feedback proportional to the analog error signal related to the difference…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.