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US 8,525,495 B2Granted
Input current generator for buck-boost circuit control
AssigneeLincoln Global, Inc.
InventorsPaul Werle, Todd E Kooken
Life of this patent
Estimating the term…
Abstract
A control circuit for a buck-boost circuit includes an inductor current sensor and an input current generator. The input current generator accepts a signal from the inductor current sensor and outputs a synthesized and integrated signal representing the average input current to the buck-boost circuit. The input current generator averages the inductor current signal or a zero signal based on the state of the buck switch in the buck-boost circuit.
Claims10
An input current generator for a buck-boost circuit, comprising:
- a current sensor outputting an inductor current signal representing an inductor current of the buck-boost circuit;
- an input current synthesizer receiving the inductor current signal and outputting a selected signal representing the inductor current signal or a zero signal based on an operating mode of the buck-boost circuit;
- a current averaging circuit integrating the selected signal and outputting an integrated current signal representing an average of an input current to the buck-boost circuit;
- and
- a buck-boost controller receiving the integrated current signal for outputting a pulse-width-modulated signal for controlling the buck-boost circuit, said buck-boost controller including:
- a PWM controller providing a master pulse-width-modulated signal;
- a clock providing a clock signal;
- and
- a PWM splitter to receive the master pulse-width-modulated signal and the clock signal to provide a first pulse-width-modulated signal to control a first switch and a second pulse-width-modulated signal to control a second switch, the PWM splitter including:
- a PWM-to-digital converter to provide a first digital signal and a second digital signal, the first digital signal represents a period of the master pulse-width-modulated signal and the second digital signal represents an amount of time at which the master pulse-width-modulated signal is at a value of zero;
- a control module to receive the first and second digital signals to provide a digital buck control signal and a digital boost control signal,
- a first digital-to-PWM module to receive the digital buck control signal, the first and second digital signals to provide the first pulse-width-modulated signal;
- and
- a second digital-to-PWM module to receive the digital boost control signal, the first and second digital signals to provide the second pulse-width-modulated signal.
11 more elements
A power supply, comprising:
- an input rectifier converting an ac input signal to a rectified dc signal;
- a pre-regulator converting the rectified dc signal to a dc bus signal having a voltage magnitude based on a predetermined setpoint, the pre-regulator comprising a buck-boost circuit;
- an output circuit that converts the dc bus signal to an output signal;
- a control circuit controlling the pre-regulator, the control circuit comprising a buck-boost controller and an input current generator, said buck-boost controller including:
- a PWM controller providing a PWM signal indicative of a difference between the predetermined setpoint and the dc bus signal;
- a clock providing a clock signal;
- and
- a PWM splitter to receive the master pulse-width-modulated signal and the clock signal to provide a first pulse-width-modulated signal to control a first switch and a second pulse-width-modulated signal to control a second switch, the PWM splitter including:
- a PWM-to-digital converter to provide a first digital signal and a second digital signal, the first digital signal represents a period of the master pulse-width-modulated signal and the second digital signal represents an amount of time at which the master pulse-width-modulated signal is at a value of zero;
- a control module to receive the first and second signals to provide a digital buck control signal and a digital boost control signal,
- a first digital-to-PWM module to receive the digital buck control signal, the first and second digital signals to provide the first pulse-width-modulated signal;
- and
- a second digital-to-PWM module to receive the digital boost control signal, the first and second digital signals to provide the second pulse-width-modulated signal,
- wherein said input current generator comprises,
- a current sensor outputting an inductor current signal representing an inductor current of the buck-boost circuit,
- an input current synthesizer receiving the inductor current signal and outputting a selected signal representing the inductor current signal or a zero signal based on an operating mode of the buck-boost circuit, and
- a current averaging circuit integrating the selected signal and outputting an integrated current signal representing an average of an input current to the buck-boost circuit, the PWM controller receiving the integrated current signal for generating the PWM signal.
14 more elements
Dependencies are inferred from the claim text.