Abstract: To provide a carbon fiber bundle capable of suppressing winding due to ring-shaped fuzzes, which occurs when the carbon fiber bundle is rolled out for advanced processing, and a production method for producing the same. Disclosed is a carbon fiber bundle wherein an average single-fiber diameter B is 6.9 to 11.0 ?m, a tensile modulus E of resin-impregnated strands is 230 to 310 GPa, the number of fuzzes inherent in the carbon fiber bundle is 40 fuzzes/m or less, and a proportion of fuzzes with a structure having a difference between skin and core is 1 to 25% of fuzzes inherent in the carbon fiber bundle. Such a carbon fiber bundle is preferably obtained by a method including, in a process of heat-treating a polyacrylonitrile-based precursor fiber bundle with a single-fiber fineness of 0.9 to 2.2 dtex in an oxidizing atmosphere at 200 to 300° C.

Abstract: A driving assistance method of assisting driving of a vehicle, includes, by a computer, acquiring biological information of a driver who is driving the vehicle, acquiring environment information of the driver, acquiring operation information of the driver, generating biological index data from the biological information, generating integrated information by aligning and combining time series of the biological index data, the environment information, and the operation information, calculating accident risk information after a predetermined time, by inputting the integrated information to an accident risk prediction model set in advance, and calculating factor information of the accident risk information by inputting the accident risk information, the integrated information, and accident risk judge information set in advance to a factor calculation model set in advance.

Abstract: A switching control circuit for a power supply circuit including a first coil, a second coil configured to generate a voltage corresponding to a current flowing through the first coil, and a switching device configured to control the current flowing through the first coil. The switching control circuit controls switching of the switching device, and includes: a drive signal generator circuit configured to generate a driving signal, based on a feedback voltage corresponding to the output voltage; a driver circuit configured to switch the switching device, in response to the driving signal; a regulator configured to generate a power supply voltage of a target level to operate the driver circuit, and a drive current of the driver circuit; and a control circuit configured to control the regulator to decrease the drive current in response to the drive current reaching a predetermined value.

Abstract: A control apparatus of a current resonance type switching power supply that has a switching element and generates an output voltage. The control apparatus includes a drive circuit configured to generate a drive signal to drive the switching element of the switching power supply, and a soft-start control circuit connected to the drive circuit, the soft-start control circuit being configured to send a signal to the drive circuit to cause the drive circuit to increment an on-width of the drive signal by a prescribed step per prescribed switching number, to thereby reduce an overshoot of the output voltage when the switching power supply is started.

Abstract: A control apparatus of a current resonance type switching power supply that has a switching element and generates an output voltage. The control apparatus includes a drive circuit configured to generate a drive signal to drive the switching element of the switching power supply, and a soft-start control circuit connected to the drive circuit, the soft-start control circuit being configured to send a signal to the drive circuit to cause the drive circuit to increment an on-width of the drive signal by a prescribed step per prescribed switching number, to thereby reduce an overshoot of the output voltage when the switching power supply is started.