These types of ballast drivers usually are meant to be furnished with the rectified AC input voltage and consequently these are intended for minimal quiescent-current and still have a l5V in-built shunt regulator to ensure that just one limiting resistor works extremely well through the DC rectifi...
In this post I have explained the construction of a DC UV germicidal lamp ballast circuit which can be used for driving any standard 20 watt UV lamp through a
In an alternative embodiment, a resistor is loaded in parallel across the transformer. The resistor should preferably have a resistance ranging between 100 to 300 ohms.US5179323 * 1991年2月27日 1993年1月12日 Ham Byung L Ballast for mini fluorescent lamp...
(0.6 ⋅ RT + 2000 ) or [Hertz] (3) or CPH = tPH ⋅ 0.331e − 6 [Farads] (8) Step 5: Program Maximum Ignition Current RT = 1.12 ⋅ 1 CT ⋅ f RUN − 3333 [Ohms] (4) The maximum ignition current is programmed with the external resistor RCS and an internal threshold...
the current from the bridge rectifier CR13, which current is equal in magnitude to the alternating current line current. The value of resistor R6 used in the preferred embodiment is 0.225 ohms. Thus, the voltage developed across resistor R6 is equal to 0.225 volts per ampere of input current...
high output light level is desired. The triac is normally biased to conduct current and thereby bypass the dimming resistor to provide full current to the lamps. When the triac is biased not to conduct, the dimming resistor is introduced into the lamp current circuit to reduce the lamp ...
The resistor on pin DIM (RDIM) discharges the capacitor on pin CPH down to the user dim setting. The resistor can be selected for a fast time constant to minimize the amount of flash visible over the lamp just after ignition, or, a long time constant such that the brightness ramps VBUS...
Pull output circuit 51 receives its on-off control signal via lines 421 and 423. The signals across coils 418 and 419 are 180° out of phase with each other. Consequently, transistor 522 is turned on by the positive going signal on line 421 through resistor 521 shortly following the time ...
6. A transistor as set forth in claim 1 wherein each resistor has a value between 0.5 and 10 ohms. Description: The invention relates to a semiconductor device comprising a semiconductor body, one surface of which is covered at least partly with an insulating layer, said device comprising at...
The fuse resistor can be a conventional common flame-proof notch groove resistor, the power thereof is best 1/4 W or 1/6W, the resistance value is best 0.7-3 ohms, and correspondingly the fuse time is = 0.1 s under 23-7 A.马恒徕马文浩...