Quasi-feedforward PWM modulator
First Claim
1. A circuit, comprising:
- a power storage element to generate a DC output voltage from an input voltage;
an output sampler to generate a feedback signal from the output voltage;
an error amplifier to generate an error signal from the feedback signal;
a ramp generator to generate a ramp signal from the error signal, wherein the compared voltage is a preset substantially constant voltage;
a comparator to generate a pulse signal by comparing the ramp signal and a compared voltage, wherein one of the ramp signal and the compared voltage is generated from the error signal; and
a power switch to switch the power storage element on and off as controlled by the pulse signal,wherein the pulse signal is generated such that, if the input voltage changes within a first range, a width of pulses of the pulse signal changes so as to maintain the output voltage substantially constant.
2 Assignments
0 Petitions
Accused Products
Abstract
Devices, circuits, and methods generate a substantially constant output voltage. A power storage element generates a DC output voltage from an input voltage. The output is sampled to generate a feedback signal. An error amplifier generates an error signal from the feedback signal and a reference voltage. A ramp generator generates a ramp signal from the error signal. A comparator generates a pulse signal by comparing the ramp signal to a threshold voltage. The pulse signal is used to control a power switch, which switches the power storage element on and off. The pulse signal is generated such that, if the input voltage changes within a certain range, a width of its pulses changes so as to maintain the output voltage substantially constant.
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Citations
19 Claims
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1. A circuit, comprising:
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a power storage element to generate a DC output voltage from an input voltage; an output sampler to generate a feedback signal from the output voltage; an error amplifier to generate an error signal from the feedback signal; a ramp generator to generate a ramp signal from the error signal, wherein the compared voltage is a preset substantially constant voltage; a comparator to generate a pulse signal by comparing the ramp signal and a compared voltage, wherein one of the ramp signal and the compared voltage is generated from the error signal; and a power switch to switch the power storage element on and off as controlled by the pulse signal, wherein the pulse signal is generated such that, if the input voltage changes within a first range, a width of pulses of the pulse signal changes so as to maintain the output voltage substantially constant. - View Dependent Claims (2, 3, 4)
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5. A DC to DC converter, comprising:
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a power storage element to generate a DC output voltage from an input voltage; an error amplifier to generate an error signal from the output voltage; a ramp generator to generate a ramp signal from the error signal; a comparator to generate a pulse signal by comparing the ramp signal to a preset threshold voltage; and a power switch to switch the power storage element on and off as controlled by the pulse signal. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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13. A device comprising:
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means for alternatingly charging and discharging a power storage element to generate a DC output voltage from an input voltage; means for generating an error signal from the output voltage; means for generating a ramp signal from the error signal; means for comparing the ramp signal to a preset threshold voltage to generate a pulse signal; and means far using the pulse signal to control the charging and discharging of the power storage element. - View Dependent Claims (14)
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15. A method comprising:
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alternatingly charging and discharging a power storage element to generate a DC output voltage from an input voltage; generating an error signal from the output voltage; generating a ramp signal from the error signal; comparing the ramp signal to a preset threshold voltage to generate a pulse signal; and using the pulse signal to control the charging and discharging of the power storage element. - View Dependent Claims (16, 17, 18, 19)
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Specification