Hysteretic controlled buck-boost converter
First Claim
1. An apparatus, comprising:
- a buck boost converter for generating a regulated output voltage responsive to an input voltage, the buck boost converter including an inductor, a first pair of switching transistors responsive to a first PWM signal and a second pair of switching transistors responsive to a second PWM signal;
an error amplifier for generating an error voltage responsive to the regulated output voltage;
a control circuit for generating a plurality of window voltages responsive to the error voltage, and for generating the first PWM signal and the second PWM signal responsive to the error voltage plurality of window voltages and a sensed current voltage responsive to a sensed current through the inductor; and
wherein the control circuit controls switching of the first pair of switching transistors and the second pair of switching transistors using the first PWM signal and the second PWM signal responsive to the sensed current through the inductor and a the plurality of offset error window voltages based on the error voltage.
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Accused Products
Abstract
An apparatus includes a buck boost converter for generating a regulated output voltage responsive to an input voltage. The buck boost converter includes an inductor, a first pair of switching transistors responsive to a first PWM signal and a second pair of switching transistors responsive to a second PWM signal. An error amplifier generates an error voltage responsive to the regulated output voltage and a reference voltage. A control circuit generates the first PWM signal and the second PWM signal responsive to the error voltage and a sensed current voltage responsive to a sensed current through the inductor. The control circuit controls switching of the first pair of switching transistors and the second pair of switching transistors using the first PWM signal and the second PWM signal responsive to the sensed current through the inductor and a plurality of offset error voltages based on the error voltage.
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Citations
29 Claims
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1. An apparatus, comprising:
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a buck boost converter for generating a regulated output voltage responsive to an input voltage, the buck boost converter including an inductor, a first pair of switching transistors responsive to a first PWM signal and a second pair of switching transistors responsive to a second PWM signal; an error amplifier for generating an error voltage responsive to the regulated output voltage; a control circuit for generating a plurality of window voltages responsive to the error voltage, and for generating the first PWM signal and the second PWM signal responsive to the error voltage plurality of window voltages and a sensed current voltage responsive to a sensed current through the inductor; and wherein the control circuit controls switching of the first pair of switching transistors and the second pair of switching transistors using the first PWM signal and the second PWM signal responsive to the sensed current through the inductor and a the plurality of offset error window voltages based on the error voltage. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A control circuit for controlling switching of a buck boost converter, the control circuit comprising:
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a first input for receiving a sensed current voltage responsive to a sensed current through an inductor of a buck boost converter; a second input for receiving an error voltage from an error amplifier; a pair of outputs for providing a first PWM signal and a second PWM signal; a PWM control circuit for generating the first PWM signal and the second PWM signal responsive to the error voltage and a sensed current voltage responsive to a sensed current through the inductor; and wherein the control circuit controls switching of thea first pair of switching transistors and thea second pair of switching transistors using the first PWM signal and the second PWM signal responsive to the sensed current through the inductor and a plurality of offset error window voltages based on the error voltage. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method for controlling operations of a buck boost converter, comprising the steps of:
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generating a regulated output voltage responsive to an input voltage; generating an error voltage responsive to the regulated output voltage and a reference voltage; generating a first PWM signal and a second PWM signal responsive to a sensed current through an inductor and a plurality of offset error window voltages based on the error voltage; and switching of a first pair of switching transistors and a second pair of switching transistors using the first PWM signal and the second PWM signal. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A method for controlling operations of a buck-boost converter, comprising:
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receiving a sensed current voltage responsive to a current through an inductor of the buck-boost converter; determining if the sensed current voltage is above or below a predefined window voltage; if the sensed current voltage is below the predefined window voltage, determining if the sensed current voltage is substantially equal to a zero voltage; if the sensed current voltage is below the predefined window voltage and substantially equal to the zero voltage, switching the buck-boost converter to a first mode of operation; and if the sensed current voltage is below the predefined window voltage and not substantially equal to the zero voltage, switching the buck-boost converter to a second mode of operation. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification