DC/DC converter and game machine using it
First Claim
1. A DC/DC converter comprising:
- an input line to which a DC input voltage is supplied;
a smoothing circuit that includes an output line and at least one output capacitor connected to the output line;
N switching circuits that each include a switching transistor and a synchronous rectifier transistor provided in series between the input line and a ground line, and each generate a switching voltage at a switching node that is a connecting node of the switching transistor and the synchronous rectifier transistor according to an input pulse signal, wherein N is an integer at least 2;
N inductors that are each provided for a respective one of the switching circuits and are each provided between the switching node of the switching circuit that corresponds and the output line;
a phase controller that dynamically switches the number K of drive phases according to a state of the DC/DC converter at the time, wherein K is an integer up to N;
a pulse modulator that generates the pulse signal having a duty ratio that is adjusted such that a feedback voltage depending on an output voltage of the output line corresponds with a predetermined reference voltage, and having a frequency that changes according to the number K of drive phases; and
a distributor that selects K switching circuits among the N switching circuits and distributes the pulse signal to each of the selected K switching circuits with a phase difference of 360/K degrees.
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Accused Products
Abstract
The present disclosure is to provide a DC/DC converter capable of suppressing increase in the ripple amount of the output voltage in association with switching of the number of drive phases. N (N is an integer equal to or larger than 2) switching circuits each generate a switching voltage at the switching node according to an input pulse signal. A phase controller dynamically switches the number K (K is an integer equal to or smaller than N) of drive phases according to the state of a DC/DC converter at the time. A pulse modulator generates a pulse signal whose frequency changes according to the number K of drive phases. A distributor selects K switching circuits among the N switching circuits and distributes the pulse signal to each of the selected K switching circuits with a phase difference of (360/K) degrees.
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Citations
10 Claims
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1. A DC/DC converter comprising:
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an input line to which a DC input voltage is supplied; a smoothing circuit that includes an output line and at least one output capacitor connected to the output line; N switching circuits that each include a switching transistor and a synchronous rectifier transistor provided in series between the input line and a ground line, and each generate a switching voltage at a switching node that is a connecting node of the switching transistor and the synchronous rectifier transistor according to an input pulse signal, wherein N is an integer at least 2; N inductors that are each provided for a respective one of the switching circuits and are each provided between the switching node of the switching circuit that corresponds and the output line; a phase controller that dynamically switches the number K of drive phases according to a state of the DC/DC converter at the time, wherein K is an integer up to N; a pulse modulator that generates the pulse signal having a duty ratio that is adjusted such that a feedback voltage depending on an output voltage of the output line corresponds with a predetermined reference voltage, and having a frequency that changes according to the number K of drive phases; and a distributor that selects K switching circuits among the N switching circuits and distributes the pulse signal to each of the selected K switching circuits with a phase difference of 360/K degrees. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A DC/DC converter comprising:
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an input line to which a DC input voltage is supplied; a smoothing circuit that includes an output line and at least one output capacitor connected to the output line; N switching circuits that each include a switching transistor and a synchronous rectifier transistor provided in series between the input line and a ground line, and each generate a switching voltage at a switching node that is a connecting node of the switching transistor and the synchronous rectifier transistor according to an input pulse signal, wherein N is an integer at least 2; N inductors that are each provided for a respective one of the switching circuits and are each provided between the switching node of the switching circuit that corresponds and the output line; a pulse modulator that generates the pulse signal having a duty ratio that is adjusted such that a feedback voltage depending on an output voltage of the output line corresponds with a predetermined reference voltage; a phase controller that decides the number K of drive phases; and a distributor that selects K switching circuits among the N switching circuits and distributes the pulse signal to each of the selected K switching circuits with a phase difference of 360/K degrees, wherein a frequency of the pulse signal for each of the numbers of drive phases is set such that a ripple of the output voltage becomes smaller compared with a case in which the frequency of the pulse signal is set constant irrespective of the number of drive phases. - View Dependent Claims (9)
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10. A game machine comprising
a DC/DC converter including: -
an input line to which a DC input voltage is supplied; a smoothing circuit that includes an output line and at least one output capacitor connected to the output line; N switching circuits that each include a switching transistor and a synchronous rectifier transistor provided in series between the input line and a ground line, and each generate a switching voltage at a switching node that is a connecting node of the switching transistor and the synchronous rectifier transistor according to an input pulse signal, wherein N is an integer at least 2; N inductors that are each provided for a respective one of the switching circuits and are each provided between the switching node of the switching circuit that corresponds and the output line; a phase controller that dynamically switches the number K of drive phases according to a state of the DC/DC converter at the time, wherein K is an integer up to N; a pulse modulator that generates the pulse signal having a duty ratio that is adjusted such that a feedback voltage depending on an output voltage of the output line corresponds with a predetermined reference voltage and, having a frequency that changes according to the number K of drive phases; and a distributor that selects K switching circuits among the N switching circuits and distributes the pulse signal to each of the selected K switching circuits with a phase difference of 360/K degrees.
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Specification