DC-DC CONVERTER
First Claim
1. A DC-DC converter, comprising:
- an inductor connected in series with a power transistor between first and second terminals of a DC supply source; and
a modulator circuit with a control output connected to a control gate of the power transistor;
the modulator circuit providing a periodic pulse signal, the duty cycle of which determines an output voltage at an output terminal of the converter;
wherein the modulator circuit comprises;
an oscillator that determines the frequency of the periodic pulse signal;
a feedforward structure that determines an approximated duty cycle for the pulse signal based on the value of the input voltage, the sensed output voltage and the amount of current flow in the inductor; and
an error amplifier with a first input connected to a reference voltage source, a second input connected to the output terminal of the converter and an output that supplies a corrective signal used by the modulator to adjust the duty cycle of the pulse signal.
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Accused Products
Abstract
A DC-DC converter with an inductor connected in series with a power transistor between first and second terminals of a DC supply source, and with a modulator circuit that has a control output connected to a control gate of the power transistor. The modulator circuit provides a periodic pulse signal the duty cycle of which determines an output voltage at an output terminal of the converter. The modulator circuit comprises an oscillator that determines the frequency of the periodic pulse signal. The modulator circuit also comprises a feedforward structure that determines an approximated duty cycle for the pulse signal based on the value of the input voltage, the sensed output voltage and the amount of current flow in the inductor. An error amplifier in the modulator has a first input connected to a reference voltage source, a second input connected to the output terminal of the converter and an output that supplies a corrective signal used by the modulator to adjust the duty cycle of the pulse signal. Thus, a multiple path feedforward topology is proposed which delivers to the modulator information on input voltage, output voltage and switch current. The feedforward concept is complemented by a low gain error amplifier which compares the output voltage to the reference voltage, which is preferably internal.
118 Citations
10 Claims
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1. A DC-DC converter, comprising:
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an inductor connected in series with a power transistor between first and second terminals of a DC supply source; and
a modulator circuit with a control output connected to a control gate of the power transistor;
the modulator circuit providing a periodic pulse signal, the duty cycle of which determines an output voltage at an output terminal of the converter;
wherein the modulator circuit comprises;
an oscillator that determines the frequency of the periodic pulse signal;
a feedforward structure that determines an approximated duty cycle for the pulse signal based on the value of the input voltage, the sensed output voltage and the amount of current flow in the inductor; and
an error amplifier with a first input connected to a reference voltage source, a second input connected to the output terminal of the converter and an output that supplies a corrective signal used by the modulator to adjust the duty cycle of the pulse signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification