Voltage buck-boost switching regulator
AssigneeTexas Instruments Incorporated
InventorMitsuyori Saitoh
Life of this patent
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Abstract
A stable, high-speed, high-efficiency constant voltage is provided without a complicated, large-scale, high-cost phase compensation circuit over a wide range of operating conditions. This voltage buck-boost switching regulator consists of a pair of voltage reducing transistors, a pair of voltage boosting transistors, inductance coil, output capacitor and controller. The controller has the following parts for performing PWM control of constant voltage for voltage reducing transistors and voltage boosting transistors: an output voltage feedback circuit, an inductor current sense circuit, a variable sawtooth wave signal generator, switching controllers, and a voltage boosting driver.
Claims18
A voltage buck-boost switching regulator comprising:
- a first switching circuit for voltage reducing connected between the voltage input terminal and one terminal of an inductance element;
- a second switching circuit for voltage boosting connected between another terminal of said inductance element and the voltage output terminal;
- an error amplifier that compares the output voltage obtained at said voltage output terminal or the output divided voltage obtained by a resistive voltage divider with a prescribed reference voltage, and amplifies the difference between them at a prescribed amplification rate to generate an error voltage;
- a current sense circuit that detects the inductance current flowing in said inductance element and generates a current sense signal corresponding to said inductance current;
- a variable sawtooth wave generator that generates a first variable sawtooth wave signal having a first top peak level and a first bottom peak level corresponding to said error voltage and a first slope corresponding to said output voltage, and a second variable sawtooth wave signal having a second top peak level and a second bottom peak level corresponding to said error voltage and a second slope corresponding to the input voltage input at said voltage input terminal;
- a first switching controller that compares the voltage level of said current sense signal and the voltage level of said first variable sawtooth wave signal, and controls said first switching circuit corresponding to their magnitude relationship;
- and
- a second switching controller that compares the voltage level of said current sense signal and the voltage level of said second variable sawtooth wave signal, and controls said second switching circuit corresponding to their magnitude relationship.
A voltage buck-boost switching regulator comprising:
- a first switching circuit for voltage reducing connected between the voltage input terminal and one terminal of an inductance element;
- a second switching circuit for voltage boosting connected between the other terminal of said inductance element and the voltage output terminal;
- and
- a controller, which detects the input voltage input to said voltage input terminal, the output voltage obtained at said voltage output terminal, and the inductance current flowing in said inductance element, and, on the basis of said detected values, said output voltage is held at the desired preset voltage by performing a switching operation at a constant frequency selectively for any one of said first switching circuit and said second switching circuit, and, at the same time, controls the duty ratio during said switching operation.
Dependencies are inferred from the claim text.