摘要:
A dimmer (300) comprising a first and second switch (311, 314) coupled in series, with a node between both coupled to signal ground; a line terminal (303) for coupling the first switch (311) to an AC power source (101); a switched line terminal (304) for coupling the second switch (314) to a load (102); a first resistive element (313) coupled in a path going from the switched line terminal (304) over the second switch (314) to the signal ground, and/or a second resistive element (312) coupled in a path going from the line terminal (303) over the first switch (311) to the signal ground and a connectivity detector (335) adapted for obtaining a signal from the first and/or second resistive element (313, 312) and for determining, based on the obtained signals, whether the dimmer (300) is connected with the AC power source (101) in 2- or 3-wire mode.
摘要:
A light-dimming device (10) includes a switch (3) including a switching device (7), a controller (4), and a power supply module (5). The power supply module (5) includes a capacitor (14) to be charged by a constant voltage circuit (13). The controller (4) includes a driver circuit (8), a zero-cross detection circuit (9), a detecting circuit (21), and a control circuit (11), and receive electric power from the capacitor (14). The driver circuit (8) drives the switching device (7) in accordance with a PWM signal (S1). The control circuit (11) starts generation of a pulse, to be contained in the PWM signal (S1), for turning on the switching device (7) after the zero-cross detection circuit (9) detects zero-cross and also a voltage (V2) across the capacitor (14) is threshold or more.
摘要:
Light-dimming device (10) includes: first and second terminals (1, 2); switch (3) including switching device (7) connected between terminals (1, 2); adjuster (6) for varying conduction angle of switch (3); controller (4) for controlling switch (3) and power supply module (5) for supplying power to controller (4). Controller (4) includes zero-cross detection circuit (9) for detecting zero-cross of AC voltage (Va), control circuit (11) for generating PWM signal of on-duty ratio corresponding to conduction angle from adjuster (6), and driver circuit (8) for turning device (7) on and off by PWM signal. Controller (4) allows device (7) to conduct and then turn off within variable period of time, from start of half cycle of AC voltage, shorter than half cycle. Circuit 11 starts generation of pulse in PWM signal when prescribed period of time, shorter than variable period of time, from zero-cross of voltage Va elapses.
摘要:
Disclosed is a universal dimmer which detects the type of load it is connected to each time the universal dimmer is activated. Information relating to the type of load connected to the universal dimmer is therefore not required to be stored for future use. In one form, the universal dimmer begins each operation in the trailing edge mode and upon detection of an inductive load, switches to leading edge mode.
摘要:
Bei einem Verfahren zur Steuerung eines bezüglich seines abzugebenden Lichtstroms einstellbaren, an einen einen Halbleiterschalter aufweisenden Dimmer 1 angeschlossenen Leuchtmittels wird die Spannung am Halbleiterschalter, wenn dieser den Stromfluss zum Leuchtmittel sperrt (Sperrspannung), als Regelgröße für die Lichtstromsteuerung verwendet, indem in Abhängigkeit von der Höhe der erfassten Sperrspannung und einem den abzugebenden Lichtstrom wiedergebenden Vergleichswert (SOLL-Wert) der Schaltzeitpunkt in Abhängigkeit von der Konzeption des Dimmers als Phasenanschnittdimmer oder Phasenabschnittdimmer zum Durchschalten des Halbleiterschalters zur Last oder zum Trennen des Halbleiterschalters von der Last generiert wird. Eine Schaltungsanordnung zum Steuern des Lichtstroms eines an einen einen Halbleiterschalter aufweisenden Dimmer 1 angeschlossenen Leuchtmittels umfasst ein Erfassungs- und Bewertungsglied 2 zum Erfassen und Bewerten der Sperrspannung am Halbleiterschalter. Der Ausgang des Erfassungs- und Bewertungsgliedes 2 ist an den Eingang 5 eines Reglers 6 angeschlossen. Der Regler 6 weist einen weiteren Eingang 7 auf, an dem ein SOLL-Wert für den Steuerwinkel zum Generieren eines Schaltzeitpunktes anliegt. Das Ausgangssignal (Stellwert) des Reglers 6 ist an den Eingang 11 eines Komparatorgliedes 10 angeschlossen.
摘要:
An apparatus in an electronic control system allows two or three wire operations. A power supply (150) can supply power to the enclosed circuitry in both two and three wire installations. Two separate zero cross detectors are used such that timing information can be collected in both two and three wire installations. Both zero cross detectors (110) are monitored and are used to automatically configure the electronic control. Over voltage circuitry senses an over voltage condition across a MOSFET which is in the off state and turns the MOSFET on so that it desirably will not reach the avalanche region. Over current circuitry senses when the current through the MOSFETs has exceeded a predetermined current threshold and then turns the MOSFETs off so they do not exceed the MOSFETs' safe operating area (SOA) curve. Latching circuitry (120) is employed to keep the protection circuitry in effect even after a fault condition has cleared. Lockout circuitry (130) is used to prevent one protection circuit from tripping after the other circuit has already tripped from a fault condition. The protection circuitry output is desirably configured such that it can bypass and override the normal turn on and turn off impedance and act virtually directly on the gates of the MOSFETs. Preferably, the system has a high efficiency switching type power supply in parallel with a low frequency controllably conductive device.
摘要:
Disclosed is a universal dimmer which detects the type of load it is connected to each time the universal dimmer is activated. Information relating to the type of load connected to the universal dimmer is therefore not required to be stored for future use. In one form, the universal dimmer begins each operation in the trailing edge mode and upon detection of an inductive load, switches to leading edge mode.
摘要:
The invention relates to a circuit device for quasi-sinusoidal lowering of an AC voltage, which is composed of a voltage divider transformer with at least one tap, whose low end is connected to the neutral wire via a first switch and whose winding or part of said winding can be magnetically short-circuited via a second switch, whereby said two switches can be alternately turned on and off at the AC voltage frequency.