CONTROL UNIT OF A SWITCHING CONVERTER OPERATING IN CONTINUOUS-CONDUCTION AND PEAK-CURRENT-CONTROL MODE
First Claim
1. A control unit configured to generate a command signal to control at least one switch element of a switching converter including the at least one switch element coupled to at least one inductor element, the at least one inductor element coupled to an input configured to receive an input voltage and an input current and having an output coupled to the at least one inductor element and configured to provide an output voltage, the control unit being configured to generate the command signal having a switching period to control the switching of the switch element and to determine, in said switching period, a first time period in which an inductor current is flowing in said at least one inductor element to store energy in said at least one inductor element, and a second time period in which energy is transferred from the said at least one inductor element to a load coupled to the output of the switching converter, said control unit configured to determine a duration of said first time period on the basis of a comparison between a peak value of the inductor current and a current reference that is a function of the input voltage and the output voltage of said voltage converter, and the control unit including a reference modification stage configured to modify a sensed value of the inductor current to compensate for distortion of the input current of the switching converter in relation to a desired sinusoidal trend introduced by a distortion factor caused by current ripple on said inductor current.
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Accused Products
Abstract
A control unit for a switching converter has an inductor element coupled to an input and a switch element coupled to the inductor element and generates a command signal having a switching period to switch the switch element and determine a first time period in which an inductor current is flowing in the inductor element for storing energy and a second time period in which energy is transferred to a load. An input current is distorted relative to a sinusoid by a distortion factor caused by current ripple on the inductor current. The duration of the first time period is determined based on a comparison between a peak value of the inductor current and a current reference that is a function of an output voltage of said voltage converter. A reference modification stage modifies one of the current reference and sensed value of the inductor current to compensate for distortion introduced by the distortion factor on the input current.
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Citations
20 Claims
- 1. A control unit configured to generate a command signal to control at least one switch element of a switching converter including the at least one switch element coupled to at least one inductor element, the at least one inductor element coupled to an input configured to receive an input voltage and an input current and having an output coupled to the at least one inductor element and configured to provide an output voltage, the control unit being configured to generate the command signal having a switching period to control the switching of the switch element and to determine, in said switching period, a first time period in which an inductor current is flowing in said at least one inductor element to store energy in said at least one inductor element, and a second time period in which energy is transferred from the said at least one inductor element to a load coupled to the output of the switching converter, said control unit configured to determine a duration of said first time period on the basis of a comparison between a peak value of the inductor current and a current reference that is a function of the input voltage and the output voltage of said voltage converter, and the control unit including a reference modification stage configured to modify a sensed value of the inductor current to compensate for distortion of the input current of the switching converter in relation to a desired sinusoidal trend introduced by a distortion factor caused by current ripple on said inductor current.
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11. A switching converter, comprising:
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switching converter circuitry including a switch element coupled to an inductor element, the inductor element coupled to an input configured to receive an input voltage and an input current and the switching converter circuitry further including an output configured to be coupled to a load and coupled to the inductor element, the switch element configured to receive a command signal that controls switching of the switch element to generate an output voltage on the output; and a control unit configured to generate the command signal having a switching period to control the switching of the switch element, the control unit configured to determine during the switching period a first time period where an inductor current flows in the inductor element to store energy in the inductor element and to determine during the switching period a second time period where energy is transferred from the inductor element to the load coupled to the output, the control unit configured to determine a duration of the first time period based on a comparison between a peak value of the inductor current and a current reference that is a function of the input voltage and the output voltage, and the control unit further configured to sense a value of the inductor current in the inductor and to adjust a value of one of the current reference and the sensed value of the inductor current to compensate for distortion of the input current. - View Dependent Claims (12, 13, 14, 15)
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16. A method, comprising:
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generating a command signal having a switching period to control switching of a switch element contained in a switching converter including an inductive element coupled to the switch element, the switching converter receiving an input voltage and an input current and generating an output voltage based upon the command signal controlling switching of the switch element; determining, in the switching period, a first time period in which an inductor current is flowing in the inductor element to store energy in the inductive element; determining a second time period in which energy is transferred from the inductive element to a load coupled to the switching converter; determining a current reference based on the input voltage and the output voltage of the switching converter; sensing a value of an inductor current through the inductive element; determining a duration of the first time period on the basis of a comparison between a peak value of the inductor current through the inductive element and the current reference; and modifying a value of one of the current reference and the sensed value of the inductor current to compensate for a distortion of the input current of the switching converter relative to a sinusoidal waveform by a distortion factor caused by a ripple on the inductor current during each switching period of the switching converter. - View Dependent Claims (17, 18, 19, 20)
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Specification