Abstract: The present invention provides a current-mode control step-up converter capable of reducing the minimum duty ratio to a sufficiently small value and facilitating the setting of the maximum duty ratio. The step-up converter comprises a current detector 9 for generating a current detection signal Vc corresponding to the current of a rectifier 4; an error amplifier 8 for generating an error signal Ve corresponding to an output DC voltage Vo; and a control circuit 10 for turning ON/OFF the main switch 3 on the basis of the current detection signal Vc and the error signal Ve. The control circuit 10 comprises a comparator 11 and a timer circuit 12. With this configuration, the ON time of the main switch 3 is set at a predetermined value, and the valley value of an inductor current changing in a triangular waveform is controlled. Hence, the OFF time of the main switch is adjusted to stabilize the output.

Abstract: An output side transfer member 103 of a second clutch C-2 extends around the outer circumferences of the output side transfer members 101, 102 of the third and first clutches C-3, C-1, the output side transfer member 104 (or 13, 101) of a fourth clutch C-4 and the output side transfer member 101 of a third clutch C-3 are linked to a sun gear S2, the output side transfer member 104 (or 13, 101) of a fourth clutch C-4, an output side transfer member 101 of a third clutch C-3, and a sun gear S2, which rotate integrally, are disposed radially inward with respect to the output side transfer member 102 of the first clutch C-1. Thereby, it becomes possible to reduce the diameter of the output side transfer member 104 (or 13, 101) of the fourth clutch C-4, to reduce the weight and inertia, and to improve the controllability of the automatic transmission 1.

Abstract: In the voltage supply circuit, a reference voltage generating circuit generates a reference voltage. An operational amplifier circuit generates an output voltage on the basis of the reference voltage. A selection circuit has at least two first terminals to select one of the first terminals and to generate a passed output voltage representing the output voltage passed through the first terminal selected. A second terminal receives the passed output voltage and is capable of outputting the passed output voltage to a load circuit. A detection circuit detects a magnitude of the passed output voltage and generates a detection voltage. The selection circuit selects a voltage corresponding to the passed output voltage generated from among at least two of the detection voltages and generates a detection voltage representing the detection voltage selected. The operational amplifier circuit decreases the difference between the reference voltage and the selected detection voltage.

Abstract: The step-down converter includes: a switch; an inductor; a rectifier; a smoothing unit; and a current bypass circuit, wherein when the current flowing toward the inductor exceeds a predetermined value, the current bypass circuit forms a path through which the current flows from the input terminal to the output terminal while bypassing the inductor.

Abstract: A reference voltage is applied from a reference voltage generating circuit to the non-inverting input terminal of an amplifier for supplying a drive voltage to the gate terminal of an NMOS transistor, and the output voltage appearing at the source terminal of the NMOS transistor is divided by a resistor pair and applied to the inverting input terminal of the amplifier. The voltage obtained by adding a voltage equal to or higher than the voltage for sufficiently driving the NMOS transistor to the output voltage appearing at the source terminal of the NMOS transistor is generated by a charge pump circuit and supplied to the amplifier as a power supply voltage. With this configuration, the drive voltage for the NMOS transistor is suppressed to the required minimum voltage while the drive voltage is obtained securely. The power consumption in the amplifier can thus be suppressed.

Abstract: A first auxiliary switch circuit is connected to one terminal and a first terminal of a main switch circuit and generates a first auxiliary detection current. A second auxiliary switch circuit is connected to the other terminal and a second terminal of the main switch circuit and generates a second auxiliary detection current. A current adjustment detection circuit adjusts the first auxiliary detection current so that the potentials of the other terminal and the first terminal are equal and passes the first auxiliary detection current in a direction of receiving the current from the first auxiliary switch circuit and adjusts the second auxiliary detection current so that the potentials of the one terminal and the second terminal are equal and passes the second auxiliary detection current in a direction of outputting the current to the second auxiliary switch circuit, thereby generating a detection current being proportional to the output current.

Abstract: An output circuit includes an output block and a predrive block for driving the output block based on an input signal. The predrive block has a clamp unit connected between the gate terminal of a first output transistor and the gate terminal of a second output transistor to limit the potential of the gate terminal of the first output transistor to a value of not more than a first potential and limit the potential of the gate terminal of the second output transistor to a value of not less than a second potential.

Abstract: A step-down switching regulator includes a switching device coupled to an input terminal to which an input voltage is applied, an inductor having a first end and a second end, the first end being connected to the switching device, a smoothing unit having an output terminal and configured to smooth a voltage at the second end of the inductor and generate an output voltage at the output terminal, a rectifier configured to flow a current to the inductor when the switching device is in an OFF state, and a control circuit configured to drive the switching device so that the output voltage becomes equal to a set target voltage. The control circuit detects a difference voltage between the input voltage and the output voltage or a difference voltage between the input voltage and the set target voltage, and causes the switching device to be in an ON state when the difference voltage is lower than or equal to a predetermined voltage value.

Abstract: An output voltage VC obtained by boosting an input voltage VIN by means of a charge pump control circuit 3 of a charge pump 102 is supplied as a power supply voltage to a control circuit 4 of a step-up converter. It is thus possible to eliminate the need for a conventional self-bias method, eliminate switching from startup oscillation to main oscillation of the conventional self-bias method upon startup, and overcome problems caused by the switching of oscillation states, thereby achieving switching power supply circuitry starting in a reliable and stable manner.

Abstract: A vehicle automatic transmission includes a planetary gear that reduces a speed of an input rotation of an input shaft and outputs a reduced speed rotation; at least two clutches that are capable of transmitting the reduced speed rotation that passes through the planetary gear; a planetary gear set having at least two rotation elements, wherein each rotation element can transmit the reduced speed rotation transmitted by the clutches; and an input transmitting clutch that is capable of transmitting the input rotation into one of the at least two rotation elements.

Abstract: In a boost converter including an input transistor receiving an input voltage, an inductor and a main switch serially connected to the input transistor, rectifying means connected to a node between the inductor and the main switch and smoothing means for smoothing the output of the rectifying means to generate an output voltage, a current detection circuit generates a current detection signal corresponding to the current flowing through the input transistor. A voltage detection circuit generates a voltage detection signal corresponding to the output voltage. A startup circuit adjusts the current at the input transistor until the output voltage reaches a first voltage when being lower than the first voltage, and turns ON the input transistor when being higher than the first voltage. A control circuit controls ON/OFF of the main switch based on the current and voltage detection signals so that the output voltage becomes a predetermined value.

Abstract: A protection device detects a temperature in a predetermined monitoring place in an electronic apparatus 3 to protect the electronic apparatus 3, and includes an oscillating circuit 20 for generating a clock signal Vck having a predetermined cycle and a predetermined ON time, and a temperature detection circuit 16 for detecting the temperature in the monitoring place during the ON time of the clock signal Vck. The protection device shuts off supply of electric power to the electronic apparatus 3, when the temperature in the monitoring place exceeds a predetermined temperature.

Abstract: There are provided an inductive load current control circuit for detecting and controlling a current flowing to an inductive load with high accuracy, and a power supply. The inductive load current control circuit includes first and second switch elements connected in series between an input voltage and a ground potential, an inductive load connected to a connection point between the first and second switch elements, a third switch element having one terminal connected to the connection point between the first and second switch elements, a current comparator connected to another terminal of the third switch element to compare an output current of the third switch element with a reference current, decide and output a magnitude relation, and a switch element control circuit that controls transition from a state in which the second switch element is turned on to a state in which the first switch element is turned on according to an output of the current comparator.

Abstract: The present invention provides an efficient multi-output power supply apparatus that enables a reduction in the on voltage of a main switch in a step-down power supply circuit or the like over a wide input range from a low input to a high input. The power supply apparatus includes a first power supply circuit that increases an input voltage from an input power source to output a first output voltage Vo1, and a second power supply circuit that outputs a second output voltage Vo2 obtained from the input voltage via a main switch circuit connected to the input power source. The main switch circuit having a first switch element that is a PMOS transistor and a second switch element that is an NMOS transistor connected to each other in parallel. The first output voltage Vo1 is applied to a gate of the second switch element.

Abstract: A step-up power supply device includes: a step-up converter; a startup circuit which controls the on/off operation of a switch element of the step-up converter when an output voltage of the device is smaller than a reference voltage; and a control circuit which operates in substitution for the startup circuit when the output voltage is higher than the reference voltage to control the on/off operation of the switch element such that the output voltage reaches a target value.

Abstract: A connection structure for an automatic transmission includes a drum member that includes a base portion, an outer diameter portion that extends from an outer diameter side of the base portion in an axial direction, and a collar portion that extends from an inner diameter side of the base portion in the axial direction; a base member that includes a raised portion, an outer diameter portion that extends from an outer diameter side of the raised portion in the axial direction, a boss portion that extends from an inner diameter side of the raised portion in the axial direction, and a connection portion that extends from an end of the outer diameter portion; and a ring gear of a planetary gear that includes a spline groove and a circular concave groove on an end portion of an inner peripheral face.

Abstract: A speed change apparatus includes a first clutch having a first clutch drum, in which an annular clutch plate is spline-fitted to an inner peripheral surface of the first clutch drum, and a clutch piston formed with a spline on an inner peripheral surface of the clutch piston is provided to slide in an axial direction and press the clutch plate; and a second clutch having a second clutch drum, which is disposed in the clutch piston of the first clutch concentrically with the first clutch, and in which a spline is formed on inner and outer peripheral surfaces of the second clutch drum such that outer peripheral surface spline teeth form inner peripheral surface spline grooves. Wherein the outer peripheral surface of the second clutch drum is spline-fitted to the inner peripheral surface of the clutch piston and an annular clutch plate is spline-fitted to the inner peripheral surface of the second clutch drum.

Abstract: The present invention is intended to provide a DC-DC converter, in which the relationship between the duty ratio of a drive signal and the output DC voltage is nonlinear, being characterized in that the relationship between an error signal and the output DC voltage is linear, and that the design of stabilizing the feedback system is facilitated. The DC-DC converter comprises an error-amplifier circuit for generating the error signal that is obtained by amplifying the error between the output and a target value, an oscillating circuit for generating a triangular wave signal having an amplitude corresponding to the error signal, and a comparison circuit for comparing the triangular wave signal with a reference signal having a predetermined value and for generating the drive signal to turn ON/OFF a switching device.

Abstract: A DC-to-DC converter includes a DC-to-DC conversion unit for converting an input voltage into an output voltage by switching operation of the switching element according to a drive signal and supplying the output voltage to a load and a control unit for generating the drive signal. The control unit includes a determination circuit for determining whether the load is in a normal operation state or a standby state, an error amplifier for generating an error signal according to the output voltage, a first drive-signal generator for generating a pulse sequence of pulses each having a pulse width according to the error signal, and a second drive-signal generator for generating a pulse having a pulse width larger than a cycle of repetition of the pulses in the pulse sequence when the voltage according to the output voltage falls below the reference voltage and the load is in the standby state.

Abstract: An automatic transmission includes a case; a speed change mechanism; a torque converter having a lock-up clutch axially arranged and freely slidably toward and away from the input shaft; a thrust bearing interposed between the flange unit and the side face of the sleeve unit on the input shaft side; a ball bearing that includes an outer race, a side face of which contacts the first step portion toward the input shaft side, and a propeller shaft connecting member capable of connecting with a propeller shaft, spline-engaging with the outer periphery of the output shaft, and contacting a side face of an inner race of the ball bearing upon being pressed axially toward the input shaft side by the propeller shaft.