OVER VOLTAGE PROTECTION CONTROL METHOD AND CIRCUIT FOR FOUR-SWITCH BUCK-BOOST CONVERTER
First Claim
1. A method of over voltage protection control, comprising:
- a) determining whether an output voltage of a buck-boost converter is in an over voltage condition, wherein said buck-boost converter comprises a first switch coupled to an input terminal and an inductor, a second switch coupled to ground and a common node of said first switch and said inductor, a third switch coupled to ground and a common node of a fourth switch and said inductor, wherein said fourth switch is coupled to an output terminal of said buck-boost converter; and
b) simultaneously controlling said first, second, third, and fourth switches in said buck-boost converter by turning on said second and third switches, and turning off said first and fourth switches, in response to said over voltage condition.
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Accused Products
Abstract
In one embodiment, a method of over voltage protection control can include: (i) determining whether an output voltage of a buck-boost converter is in an over voltage condition, where the buck-boost converter includes a first switch coupled to an input terminal and an inductor, a second switch coupled to ground and a common node of the first switch and the inductor, a third switch coupled to ground and a common node of a fourth switch and the inductor, where the fourth switch is coupled to an output terminal of the buck-boost converter; and (ii) simultaneously controlling the first, second, third, and fourth switches in the buck-boost converter by turning on the second and third switches, and turning off the first and fourth switches, in response to the over voltage condition.
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Citations
8 Claims
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1. A method of over voltage protection control, comprising:
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a) determining whether an output voltage of a buck-boost converter is in an over voltage condition, wherein said buck-boost converter comprises a first switch coupled to an input terminal and an inductor, a second switch coupled to ground and a common node of said first switch and said inductor, a third switch coupled to ground and a common node of a fourth switch and said inductor, wherein said fourth switch is coupled to an output terminal of said buck-boost converter; and b) simultaneously controlling said first, second, third, and fourth switches in said buck-boost converter by turning on said second and third switches, and turning off said first and fourth switches, in response to said over voltage condition. - View Dependent Claims (2, 3, 4)
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5. An apparatus, comprising:
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a) a buck-boost converter comprising a first switch coupled to an input terminal and an inductor, a second switch coupled to ground and a common node of said first switch and said inductor, a third switch coupled to ground and a common node of a fourth switch and said inductor, wherein said fourth switch is coupled to an output terminal of said buck-boost converter; b) an over voltage detection circuit configured to receive a voltage feedback signal indicative of an output voltage of said buck-boost converter, and an over voltage threshold signal, and to generate an over voltage signal; c) a first control circuit configured to generate a first PWM control signal according to an operation mode of said buck-boost converter; d) a first logic circuit configured to receive said first PWM control signal and said over voltage signal, and to control said first and second switches; e) a second control circuit configured to generate a second PWM control signal according to said operation mode of said buck-boost converter; and f) a second logic circuit configured to receive said second PWM control signal and said over voltage signal, and to control said third and fourth switches. - View Dependent Claims (6, 7, 8)
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Specification