Power converter having switching frequency phase locked to syste

Details Power converter having switching frequency phase locked to syste Power converter having switching frequency phase locked to syste

1996-12-11

1998-09-22

Wambach, Margaret Rose

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327158, 327243, 327244, H03L 706

Patent

active

058119990

ABSTRACT:
A circuit for synchronizing a periodic ramp signal utilized in a switching mode power converter to system clock signal. A capacitor is charged through a resistor. When a voltage across the capacitor reaches a predetermined level, the capacitor is discharged and the charging cycle is repeated, thereby generating the periodic ramp signal across the capacitor. A waveform shaping circuit shapes the ramp signal into a rectangular wave signal having a same frequency and phase as the ramp signal. A phase comparator compares a phase of the rectangular wave signal to a phase of the system clock signal for forming a phase error signal. The phase error signal controls a level of current supplied to the timing capacitor by a voltage controlled current source. When the frequency of the system clock signal is higher than the frequency of the ramp signal, the phase comparator causes the voltage controlled current source to supply additional current to the capacitor, increasing the frequency of the ramp signal. When the frequency of the system clock signal is lower than the frequency of the ramp signal, the phase comparator causes the voltage controlled current to supply less current to the capacitor, decreasing the frequency of the ramp signal. Therefore, the frequency of the ramp signal is controlled in phase locked loop to synchronize the ramp signal with the system clock signal. The synchronized ramp signal can then be utilized for controlling switching in the switching mode power converter, reducing the effects of switching noise.

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