Abstract: A cycle setting unit of a signal generating circuit varies a set cycle value. A first determining unit determines a first ON time on the basis of: a first duty ratio obtained by correcting, with a correction value, a ratio between a target ON time and a reference cycle; and a set cycle value. A second determining unit determines, as a second ON time, a setting candidate value that is close to the first ON time. A generating unit generates a PWM signal reflecting the set cycle value and the second ON time. A third determining unit determines the correction value that is to be used next time by the first determining unit, on the basis of the target ON time, the reference cycle, the correction value of the previous time, the set cycle value, and the second ON time.

Abstract: A cycle setting unit of a signal generating circuit varies a set cycle value. A first determining unit determines a first ON time on the basis of: a first duty ratio obtained by correcting, with a correction value, a ratio between a target ON time and a reference cycle; and a set cycle value. A second determining unit determines, as a second ON time, a setting candidate value that is close to the first ON time. A generating unit generates a PWM signal reflecting the set cycle value and the second ON time. A third determining unit determines the correction value that is to be used next time by the first determining unit, on the basis of the target ON time, the reference cycle, the correction value of the previous time, the set cycle value, and the second ON time.

Abstract: A vehicle-mounted signal generation circuit for generating a PWM signal to be provided to a voltage conversion device that outputs an output voltage generated by converting an input voltage with an on/off operation of a switch according to the PWM signal, the vehicle-mounted signal generation circuit including an electronic control unit that is configured to: generate the PWM signal for the voltage conversion device; set a target duty ratio, which is a target value of a duty ratio of the PWM signal, based on an output from the voltage conversion device; set a cycle setting value of the PWM signal and to change the cycle setting value set according to passage of time; and set an output duty ratio, which is a value of a duty ratio based on the target duty ratio set and the cycle setting value set.

Abstract: A CPU determines an ON-time setting value with which the generating unit generates a PWM signal having an ON time that is closest to the ON time corresponding to a product of a reference period and a target duty cycle, and sets the determined setting value in the generating unit. The CPU divides the ON time of the PWM signal based on the determined ON-time setting value, multiplies, by N, the period that corresponds to a result of the division, and specifies a period settable value with which a PWM signal having a period that is closest to a result of the multiplication is generated. The CPU determines period setting values for N periods based on a quotient and a remainder obtained by dividing the specified settable value by N, and sets the determined setting values in the generating unit for each period of the PWM signal.

Abstract: A power supply device that can perform feedback control with high responsivity when an output current greatly changes is realized with a configuration that can further reduce power consumption. A power supply device is configured to (i) detect a current change ratio ?Ir of a current output from a voltage conversion unit; (ii) determine a processing speed in such a manner that the larger the detected current change ratio ?Ir is, the higher the processing speed is; and (iii) compute a duty ratio of a PWM signal that is to be supplied, based on a predetermined target values Ita and Vta and a current value Iout and a voltage value Vout, and that outputs, a PWM signal that has been set so as to have the duty ratio obtained through the computation.

Abstract: A multiphase converter is provided with a multiphase conversion unit including a plurality of voltage conversion units; and a control unit configured to individually control the voltage conversion units using control signals. The control unit performs soft start control on the voltage conversion units by offsetting the time periods for individual voltage conversion units against each other. A detection unit detects a value reflecting an output current or an output voltage on a common output path from the plurality of voltage conversion units. The abnormality identifying unit identifies the abnormal voltage conversion unit or the abnormal group of voltage conversion units that generates an abnormal current or an abnormal voltage based on a result of detection by the detection unit during the time periods in which the soft start control is performed.

Abstract: A power supply device that can perform feedback control with high responsivity when an output current greatly changes is realized with a configuration that can further reduce power consumption. A power supply device is configured to (i) detect a current change ratio ?Ir of a current output from a voltage conversion unit; (ii) determine a processing speed in such a manner that the larger the detected current change ratio ?Ir is, the higher the processing speed is; and (iii) compute a duty ratio of a PWM signal that is to be supplied, based on a predetermined target values Ita and Vta and a current value Iout and a voltage value Vout, and that outputs, a PWM signal that has been set so as to have the duty ratio obtained through the computation.

Abstract: A voltage conversion device that includes a switching element; an inductor; a drive circuit, wherein, by turning the switching element on/off with the drive circuit with a PWM signal, an inductor current is generated to transform an input voltage and output a transformed voltage to a load; and a controller that is configured to: switch a switching frequency with the drive circuit according to a size of a current output to the load; and change a waveform of the PWM signal when the switching frequency is switched, wherein the controller is configured to change an on-time of the PWM signal, and to turn the switching element on/off.

Abstract: A vehicle-mounted signal generation circuit for generating a PWM signal to be provided to a voltage conversion device that outputs an output voltage generated by converting an input voltage with an on/off operation of a switch according to the PWM signal, the vehicle-mounted signal generation circuit including an electronic control unit that is configured to: generate the PWM signal for the voltage conversion device; set a target duty ratio, which is a target value of a duty ratio of the PWM signal, based on an output from the voltage conversion device; set a cycle setting value of the PWM signal and to change the cycle setting value set according to passage of time; and set an output duty ratio, which is a value of a duty ratio based on the target duty ratio set and the cycle setting value set.

Abstract: A signal generation circuit, a voltage conversion device, and a computer program are provided wherein the minimum increment of a value to be set for a generating portion, can be made substantially smaller than an actual increment with a relatively small processing load. A CPU specifies a set value Y (closest to a target value X) and a second closest set value Z in every N periods of a first signal, determines N set values for the first signal by combining Y and Z based on the result of comparison between the values of Y and Z and the value of X, sets one set value for a generating portion for each period of the first signal, calculates a value for setting off-time of the second signal in a first period in N periods as an additional value, and sets the calculated value for the generating portion.

Abstract: Provided are a signal generating circuit, a voltage conversion device, and a signal generating method configured to make a minimum unit of values that are respectively set in m (where m is a natural number equal to or greater than 2) generating units that periodically generate PWM signals corresponding to the setting values substantially smaller than an actual minimum unit. A CPU specifies, at every n periods of the PWM signals generated by the m generating units SG1, SG2, . . . SGm, a settable value closest to the sum of target values for n periods, determines (m×n) setting values for n periods based on a quotient and a remainder obtained by dividing the specified settable value by the product of m and n, and sets the determined values in the respective generating units SG1, SG2, . . . SGm, using phase-specific interrupt processes that are different from each other.

Abstract: A configuration is realized that can subject, when operation of a multiphase conversion unit starts, voltage conversion units to control of gradually increasing a target value for output, and can suppress a reverse flow, more easily and further avoiding a loss. A multiphase converter is provided with a control unit configured to control a multiphase conversion unit, and the control unit sequentially drives, when operation of the multiphase conversion unit is started, a plurality of voltage conversion units by offsetting the points in time at which the driving is started against each other. Also, the control unit determines, each time the driving of a voltage conversion unit is started, whether or not the value detected by the detection unit has reached an individual threshold associated with the number of driven voltage conversion units, and starts to drive the next voltage conversion unit when the value has reached the individual threshold.

Abstract: A signal generation circuit, a voltage conversion device, and a computer program are provided wherein the minimum increment of a value to be set for a generating portion, can be made substantially smaller than an actual increment with a relatively small processing load. A CPU specifies a set value Y (closest to a target value X) and a second closest set value Z in every N periods of a first signal, determines N set values for the first signal by combining Y and Z based on the result of comparison between the values of Y and Z and the value of X, sets one set value for a generating portion for each period of the first signal, calculates a value for setting off-time of the second signal in a first period in N periods as an additional value, and sets the calculated value for the generating portion.

Abstract: A configuration is realized that can subject, when operation of a multiphase conversion unit starts, voltage conversion units to control of gradually increasing a target value for output, and can suppress a reverse flow, more easily and further avoiding a loss. A multiphase converter is provided with a control unit configured to control a multiphase conversion unit, and the control unit sequentially drives, when operation of the multiphase conversion unit is started, a plurality of voltage conversion units by offsetting the points in time at which the driving is started against each other. Also, the control unit determines, each time the driving of a voltage conversion unit is started, whether or not the value detected by the detection unit has reached an individual threshold associated with the number of driven voltage conversion units, and starts to drive the next voltage conversion unit when the value has reached the individual threshold.

Abstract: A multiphase converter is provided with a multiphase conversion unit including a plurality of voltage conversion units; and a control unit configured to individually control the voltage conversion units using control signals. The control unit performs soft start control on the voltage conversion units by offsetting the time periods for individual voltage conversion units against each other. A detection unit detects a value reflecting an output current or an output voltage on a common output path from the plurality of voltage conversion units. The abnormality identifying unit identifies the abnormal voltage conversion unit or the abnormal group of voltage conversion units that generates an abnormal current or an abnormal voltage based on a result of detection by the detection unit during the time periods in which the soft start control is performed.

Abstract: A CPU determines an ON-time setting value with which the generating unit generates a PWM signal having an ON time that is closest to the ON time corresponding to a product of a reference period and a target duty cycle, and sets the determined setting value in the generating unit. The CPU divides the ON time of the PWM signal based on the determined ON-time setting value, multiplies, by N, the period that corresponds to a result of the division, and specifies a period settable value with which a PWM signal having a period that is closest to a result of the multiplication is generated. The CPU determines period setting values for N periods based on a quotient and a remainder obtained by dividing the specified settable value by N, and sets the determined setting values in the generating unit for each period of the PWM signal.

Abstract: Provided are a signal generating circuit, a voltage conversion device, and a signal generating method configured to make a minimum unit of values that are respectively set in m (where m is a natural number equal to or greater than 2) generating units that periodically generate PWM signals corresponding to the setting values substantially smaller than an actual minimum unit. A CPU specifies, at every n periods of the PWM signals generated by the m generating units SG1, SG2, . . . SGm, a settable value closest to the sum of target values for n periods, determines (m×n) setting values for n periods based on a quotient and a remainder obtained by dividing the specified settable value by the product of m and n, and sets the determined values in the respective generating units SG1, SG2, . . . SGm, using phase-specific interrupt processes that are different from each other.

Abstract: Using a friction material composition comprising: a fiber; a friction adjusting material; a binding material; and an uncrosslinked rubber being solid at normal temperature (25° C.), a friction material is obtained, wherein an ambient compressibility in a piston-pressing direction is 2% or less at normal temperature (25° C.) and at 4 MPa, and a tan ? value in a sliding direction at ?20° C. to 50° C. is 0.05 or larger. Thereby, a friction material which has high damping properties and acceptable brake noise, which can prevent a decrease in responsiveness when brakes are applied, and prevent a decrease in the feeling of effectiveness associated therewith, and which can suppress a decrease in the fuel efficiency and an increase in abrasion caused by the dragging occurring when the friction material is brought into contact with a brake rotor; and a method for producing the friction material, can be provided.

Abstract: Using a friction material composition comprising: a fiber; a friction adjusting material; a binding material; and an uncrosslinked rubber being solid at normal temperature (25° C.), a friction material is obtained, wherein an ambient compressibility in a piston-pressing direction is 2% or less at normal temperature (25° C.) and at 4 MPa, and a tan ? value in a sliding direction at ?20° C. to 50° C. is 0.05 or larger. Thereby, a friction material which has high damping properties and acceptable brake noise, which can prevent a decrease in responsiveness when brakes are applied, and prevent a decrease in the feeling of effectiveness associated therewith, and which can suppress a decrease in the fuel efficiency and an increase in abrasion caused by the dragging occurring when the friction material is brought into contact with a brake rotor; and a method for producing the friction material, can be provided.

Abstract: Using a friction material composition comprising: a fiber; a friction adjusting material; a binding material; and an uncrosslinked rubber being solid at normal temperature (25° C.), a friction material is obtained, wherein an ambient compressibility in a piston-pressing direction is 2% or less at normal temperature (25° C.) and at 4 MPa, and a tan ? value in a sliding direction at ?20° C. to 50° C. is 0.05 or larger. Thereby, a friction material which has high damping properties and acceptable brake noise, which can prevent a decrease in responsiveness when brakes are applied, and prevent a decrease in the feeling of effectiveness associated therewith, and which can suppress a decrease in the fuel efficiency and an increase in abrasion caused by the dragging occurring when the friction material is brought into contact with a brake rotor; and a method for producing the friction material, can be provided.