摘要:
The voltage of a detection resistor connected to the drain of a low-side switching device is normally a negative voltage, but a positive voltage appears when a countercurrent occurs in an abnormal state. A current comparator monitors the voltage of the detection resistor, transmits high output to an AND circuit whole the voltage of the detection resistor is a negative voltage to maintain the output voltage of the current comparator in a low state when an output signal of a driver can be transmitted to the low-side switching device, and allows the output voltage of the current comparator in a low state when the voltage of the detection resistor becomes a positive voltage, thereby forcibly turning off the low-side switching device.
摘要:
The voltage of a detection resistor connected to the drain of a low-side switching device is normally a negative voltage, but a positive voltage appears when a countercurrent occurs in an abnormal state. A current comparator monitors the voltage of the detection resistor, transmits high output to an AND circuit whole the voltage of the detection resistor is a negative voltage to maintain the output voltage of the current comparator in a low state when an output signal of a driver can be transmitted to the low-side switching device, and allows the output voltage of the current comparator in a low state when the voltage of the detection resistor becomes a positive voltage, thereby forcibly turning off the low-side switching device.
摘要:
A current negative-feedback circuit comprises a current detection unit and a sawtooth-shaped waveform generation unit. The current detection unit comprises a first P-ch MOSFET Q2 and a second P-ch MOSFET Q3 which constitute a current mirror circuit, a current adjustment resistor R4, a current detection resistor R1, and a constant current source I1. The current mirror circuit outputs current almost proportional to the charge current of an inductance via a switching device or outputs a current which is the quadratic function of the charge current of an inductance. The sawtooth-shaped waveform generation means adds the constant charge current of the constant current source I2 and the current output from the current mirror circuit, charges the capacitor C1, and generates a sawtooth-shaped waveform.
摘要:
A current negative-feedback circuit comprises a current detection unit and a sawtooth-shaped waveform generation unit. The current detection unit comprises a first P-ch MOSFET Q2 and a second P-ch MOSFET Q3 which constitute a current mirror circuit, a current adjustment resistor R4, a current detection resistor R1, and a constant current source I1. The current mirror circuit outputs current almost proportional to the charge current of an inductance via a switching device or outputs a current which is the quadratic function of the charge current of an inductance. The sawtooth-shaped waveform generation means adds the constant charge current of the constant current source I2 and the current output from the current mirror circuit, charges the capacitor C1, and generates a sawtooth-shaped waveform.
摘要:
A film advancing system of a camera in which a roll of film inside a film cartridge is first wound to a spool and then the film is rewound into the cartridge one frame from another after each photographic operation is provided. The system includes a reversibly rotatable motor the drivement and rotational direction of which are automatically controlled depending upon various conditions of the camera to implement required advancement of the film.
摘要:
A Bi-CMOS ( Bipolar-Complementary Metal Oxide Silicon ) gate array includes bipolar transistors, and P-channel and N-channel MOS transistors all formed on the same single chip in the form of an array. Such a chip may provide desired bipolar and MOS transistor characteristics at the same time by itself.
摘要:
A film advancing system of a camera in which a roll of film inside a film cartridge is first wound to a spool and then the film is rewound into the cartridge one frame from another after each photographic operation is provided. The system includes a reversibly rotatable motor the drivement and rotational direction of which are automatically controlled depending upon various conditions of the camera to implement required advancement of the film.
摘要:
A camera system in which information is transmitted between a camera body and an accessory in the form of a current signal is provided. A voltage-to-current converter is provided in at least either one of the camera body and accessory and a current-to-voltage converter is provided in at least the other of the camera body and accessory. Thus, analog information can be transmitted between the camera body and the accessory with high accuracy even if they have separate voltage sources different in level.
摘要:
A package for dispensing a pourable product has a first hollow body member, a second hollow body member, and a pouring spout. The first hollow body member has a first exterior surface and opposite therefrom a first interior surface which defines a first internal volume. The second hollow body member has a second exterior surface, a second interior surface, a flow-regulating passage, and a dispensing passage separate from the flow-regulating passage. The second exterior surface defines a second external volume smaller than the first internal volume. Opposite the second exterior surface, the second hollow interior surface defines a second internal volume. A fastener is formed on the second interior surface. The pouring spout is operatively connected to the dispensing passage.
摘要:
A distance measuring apparatus for automatically measuring a distance from a reference point to a subject of interest, such as a subject to be photographed, is provided. The present apparatus includes a position sensitive detector having a photoelectric surface defined between two extreme points. Thus, when a light pulse emitted from the apparatus is reflected by the subject and impinges upon the photoelectric surrface, there is produced a pair of current signals, which are then processed to obtain a distance signal indicating the distance to be measured. Thus, the present apparatus can provide a highly accurate measurement.