Abstract: A power feed unit that includes multiple first terminal sections, a second terminal section, and a switch is disclosed. Each first terminal section includes a first power supply terminal directed to receive electric power from a battery, and a first communication terminal directed to perform a communication with the battery. The second terminal section includes a second power supply terminal directed to supply electric power to an electronic apparatus, and a second communication terminal directed to perform a communication with the electronic apparatus. The switch electrically couples one of the first communication terminals with the second communication terminal.

Abstract: A power feed unit according to an embodiment of the present disclosure includes two or more first terminal sections, a second terminal section, and a switch. The first terminal sections each include a first power supply terminal directed to receiving electric power from the battery, and a first communication terminal directed to performing communication with the battery. The second terminal section includes a second power supply terminal directed to supplying electric power to the electronic apparatus, and a second communication terminal directed to performing communication with the electronic apparatus. The switch electrically couples one first communication terminal of the two or more first communication terminals and the second communication terminal to each other.

Abstract: A power supply device has a pulse width control circuit for controlling voltage converting operation of a voltage converting circuit by changing a pulse width. A momentary interruption detecting circuit detects a change in an output voltage when the output voltage suffers a momentary interruption over a short period of time. A full short-circuit detecting circuit detects a change in the output voltage when the output voltage suffers a short circuit over a very short period of time. A short-circuit control circuit stops a pulse width changing control process of the pulse width control circuit a predetermined period of time after the momentary interruption detecting circuit has detected that the output voltage suffers a momentary interruption, and stops the pulse width changing control process of the pulse width control circuit immediately when the full short-circuit detecting circuit detects that the output voltage suffers a short circuit.

Abstract: A power supply device has a pulse width control circuit for controlling voltage converting operation of a voltage converting circuit by changing a pulse width. A momentary interruption detecting circuit detects a change in an output voltage when the output voltage suffers a momentary interruption over a short period of time. A full short-circuit detecting circuit detects a change in the output voltage when the output voltage suffers a short circuit over a very short period of time. A short-circuit control circuit stops a pulse width changing control process of the pulse width control circuit a predetermined period of time after the momentary interruption detecting circuit has detected that the output voltage suffers a momentary interruption, and stops the pulse width changing control process of the pulse width control circuit immediately when the full short-circuit detecting circuit detects that the output voltage suffers a short circuit.

Abstract: A DC power supply device for use with a video tape recorder with a built-in camera has a plurality of power supply blocks for supplying a plurality of voltages, each of the power supply blocks being composed of a switching circuit for being supplied with a DC voltage and a smoothing circuit connected to an output terminal of the switching circuit. The power supply blocks are mounted on a multilayer circuit board which includes a layer of a ground pattern with an electric conductor extending substantially fully thereover, the ground pattern being separated into a plurality of ground pattern portions by a plurality of recesses defined therein, the power supply blocks having respective ground terminals connected to the ground pattern portions, respectively.

Abstract: Motor control apparatus comprised of a drive circuit for supplying drive current to a motor, an overload detector coupled to the motor for detecting the magnitude of the motor current to produce an output signal if that current exceeds a predetermined threshold level caused by motor overload, and a control circuit coupled to the drive circuit and responsive to the output signal for controlling the drive current supplied to the motor, thereby controlling motor operation.

Abstract: Motor control apparatus comprised of a drive circuit for supplying drive current to a motor, an overload detector coupled to the motor for detecting the magnitude of the motor current to produce an output signal if that current exceeds a predetermined threshold level caused by motor overload, and a control circuit coupled to the drive circuit and responsive to the output signal for controlling the drive current supplied to the motor, thereby controlling motor operation.

Abstract: Motor control apparatus comprised of a drive circuit for supplying drive current to a motor, an overload detector coupled to the motor for detecting the magnitude of the motor current to produce an output signal if that current exceeds a predetermined threshold level caused by motor overload, and a control circuit coupled to the drive circuit and responsive to the output signal for controlling the drive current supplied to the motor, thereby controlling motor operation.

Abstract: A voltage has a level which depends on rotational speed of a motor. The voltage is applied to the motor to energize the motor. A current through the motor is sensed. The level of the voltage is adjusted in accordance with the sensed current.