摘要:
Gegenstand der Erfindung ist eine auf eine abfallende Spannungsflanke ansprechende Schaltungsanordnung (24). Die Schaltungsanordnung enthält ein gepoltes Relais (10), dessen Spule (12) in Reihe mit einem Kondensator (14) gelegt ist. Parallel zu dieser Reihenschaltung ist ein Widerstand (16) geschaltet.
摘要:
Gegen Unterspannung empfindliche Verbraucher sind dann nicht von dem Mikroprozessor (MC) zugeschaltet, wenn an einem Eingang (IRQ) des Mikroprozessors eine Spannungs-Schaltschwelle (US) unterschritten ist, die durch die minimal zulässige Primärwechselspannung (u1) bei maximal möglicher Ansteuer-Last (L1-L2) für die Ansteuerung der Verbraucher definiert ist; dadurch ist für die Mikroprozessor-Steuervorrichtung eingangsseitig ein preiswerter, lastempfindlicher Transformator (TR) einsetzbar.
摘要:
A current limited low dropout voltage circuit for coupling between first and second power supply terminals and an output terminal for providing a current limited low dropout voltage having a MOS pass transistor (P1) coupled in series between the first power supply terminal and the output terminal, a drive circuit (P2-P5) coupled to the gate of the MOS pass transistor, circuitry for limiting the gate-source voltage of the MOS pass transistor to limit the maximum current therethrough to a first maximum current level when the voltage between the second power supply terminal and the output terminal is less than a predetermined value, and circuitry for limiting the gate-source voltage of the MOS pass transistor to limit the maximum current therethrough to a second maximum current level when the source to drain voltage of the MOS pass transistor is greater than a predetermined voltage difference and the voltage between the output terminal and the second power supply terminal is greater than the predetermined value, the second maximum current level being greater than the first maximum current level.
摘要:
An automobile radio telephone apparatus capable of detecting (30,32,26) a drop of power source voltage to prevent a telephone channel from being occupied wastefully and to thereby enhance efficient use of channels with regard to the operation of an automobile radio telephone system. When the power source voltage is lower than a predetermined voltage, the apparatus informs the user of such an occurrence (38,40). On the lapse of a predetermined period of time (34) and if a conversation is under way, the apparatus warns the user that it will execute a forcible conversation ending procedure (36) and then executes it.
摘要:
A CPU (20) in a power source controller (4) generates various error status data, that correspond to various kinds of failure conditions, based on detection signals supplied from a variety of failure detection circuits (5-7, 10-13) provided at a power source circuit. The CPU (20) controls an LED (14) in a blinker based on the error status data to light up and extinguish the LED (14) in an orderly fashion which is fixed by the generated data, so that the blinker blinks variously in correspondence with various kinds of power failure conditions. Thus, a various kinds of power failure conditions can be indicated by difference in blinking operation of the blinker.
摘要:
A CPU (20) in a power source controller (4) generates various error status data, that correspond to various kinds of failure conditions, based on detection signals supplied from a variety of failure detection circuits (5-7, 10-13) provided at a power source circuit. The CPU (20) controls an LED (14) in a blinker based on the error status data to light up and extinguish the LED (14) in an orderly fashion which is fixed by the generated data, so that the blinker blinks variously in correspondence with various kinds of power failure conditions. Thus, a various kinds of power failure conditions can be indicated by difference in blinking operation of the blinker.
摘要:
A drive circuit for an output device, such as a printer or the like, has a processing unit (4) for generating control signals for controlling the output device, and driving means (6) operable by the control signals for driving the output device. The drive circuit also has a power supply (1), and voltage detecting means (3) for detecting a drop in the voltage supplied by the power supply below a pre-determined level higher than a minimum operating voltage for the processing means. The voltage detecting means are arranged to co-operate with the driving means so as to inhibit operation of the output device when the power supply voltage drops below the pre-determined level.
摘要:
An automobile radio telephone apparatus capable of detecting (30,32,26) a drop of power source voltage to prevent a telephone channel from being occupied wastefully and to thereby enhance efficient use of channels with regard to the operation of an automobile radio telephone system. When the power source voltage is lower than a predetermined voltage, the apparatus informs the user of such an occurrence (38,40). On the lapse of a predetermined period of time (34) and if a conversation is under way, the apparatus warns the user that it will execute a forcible conversation ending procedure (36) and then executes it.