Oscillators – Single oscillator with plural output circuits – Plural outputs of diverse wave form
Patent
1995-03-30
1997-01-07
Grimm, Siegfried H.
Oscillators
Single oscillator with plural output circuits
Plural outputs of diverse wave form
323288, 327132, 327135, 327163, 331 75, 331143, 363 21, G05F 1613, H02M 3335, H03K 450
Patent
active
055921280
ABSTRACT:
An oscillator for generating a varying amplitude feed forward power factor correction (PFC) modulation ramp signal includes a clock generating circuit and a ramp generating circuit. The PFC ramp signal generated by the ramp generating circuit is used within a power factor correction circuit of a switching mode power converter. The timing capacitor used within the ramp generating circuit is charged from the full wave rectified line input voltage so that the amplitude of the generated ramp output signal will follow the full wave rectified input signal, thereby maintaining the current loop bandwidth at a constant value and improving the transient response of the circuit. A one-shot circuit is coupled between the discharge transistor of the clock generating circuit and the discharge transistor of the ramp generating circuit for synchronizing the clock and ramp reference signals generated by the oscillator so that the frequency of the ramp reference signal is equal to the frequency of the clock signal. The one-shot circuit has a duty cycle which is always a fixed percentage of the period of the clock reference signal.
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Grimm Siegfried H.
Micro Linear Corporation
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