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參數(shù)資料
| 型號： | DI 300 |
| 廠商： | SIEMENS AG |
| 英文描述： | Phase Switch-off Dimmer(相位轉(zhuǎn)換調(diào)光器) |
| 中文描述： | 相開關(guān)過調(diào)光器（相位轉(zhuǎn)換調(diào)光器） |
| 文件頁數(shù)： | 3/5頁 |
| 文件大?。?/td> | 466K |
| 代理商： | DI 300 |
of switching frequency, control power,
dynamic losses and size.
This dimmer switch makes use of an
SPP 20N60S5 in the TO220 package.
Dielectric strength is 600V, the
maximum current is 20 A, and its
RDS(on) is a mere 0.19
. In addition, it
has an integral freewheeling diode.
Before this, a transistor with comparable
data values was only available in the TO
264 or isotope package.
The ELV phase switch-off dimmer,
DI 300
The circuit technology of the DI 300
phase cut-off dimmer is arranged for
two-wire operation, so that it can replace
a conventional switch or dimmer with no
problems. Switching on or off, and
dimming, are effected by means of one or
more switches in parallel. The ability to
connect up several external switches
allows the dimmer to be used as a current
impulse relay. Thus, a switch can be
mounted in different places, allowing the
light to be switched on or off and
dimmed from these locations.
The dimensions of the circuit board
(diameter 55 mm, depth 16.5 mm) were
selected to allow it to be installed
without difficulty in a normal flush-
mounted switch box. It may even be
possible to mount it directly behind the
switch.
However, if this method of installation is
used, it is essential to ensure adequate
insulation and heat dissipation.
Another feature of this dimmer is
that, by comparison with conventional
phase switch-on dimmers, its operation is
almost silent, because the interference
suppression coil can be omitted.
The brightness of the connected lamp
is set according to the length of time that
the switch is kept pressed. A brief press
(between 50 and 400 ms) switches the
light on or off. If the switch is held down
for longer than 400 ms, the brightness of
the lamp is adjusted. For example, if the
lamp was switched on at full brightness,
then after 400 ms the dimmer begins to
turn it down. When the minimum
brightness is reached, the dimmer
reverses to brighten the light, and so on.
The direction of change also reverses if
the switch is briefly released and then
pressed again for longer than 400 ms.
After it has been switched off, the
dimmer automatically starts up next time
at the level of brightness last used. A
special function allows the DI 300 to be
switched on at full brightness
irrespective of the last brightness level
set. To do so, the switch only has to be
held down for more than 400 ms when
switching on. The dimmer then
automatically starts at full brightness.
Circuit
Figure 6 shows the clear circuitry of
the ELV phase cut-off dimmer, which
consists of few components. In the
switched-off state, the mains voltage is
applied to the load at terminal KL1. It is
then fed via fuse SI1 to the bridge
rectifier comprising diodes D1 to D4.
Relative to the rectifier’s ground point
(anodes D2 and D4), the rectified AC
voltage emerges from the cathodes of D1
and D3, and is fed to the high-voltage
MOS-FET T1 and
to R9. If the logic described below
switches the MOS-FET T1 to conduct,
then the rectified mains voltage is short-
circuited and the load is energized.
The dimmer itself requires two
supply voltages. To trigger the MOS-
FET, a 10 V source is required, while to
power the processor only 3.6V is
required. These two voltages are
generated as described below.
The chain of resistors R9, R10 and
R11 steps down the rectified mains
voltage, Zener diode D7 limits it to a
maximum of 10 V. Electrolytic capacitor
C4 acts as a filter. D6 prevents the
discharge of C4 when the MOS-FET is
switched on. Voltage regulator IC1 (HT
1036) provides a voltage stabilized at 3.6
V at its output, pin 3, which supplies
processor IC2 at pin 1. C7 and C8 are
used here to provide further filtering.
It is particularly important to detect
the passage through zero exactly,
independent of the phase angle set. For
this purpose, the input voltage applied
before the bridge rectifier is tapped off
via R4, and is limited to 3.9 V by Zener
diode D5. As shown on the circuit
diagram, the negative edge of the voltage
applied to Z-diode D5 is the only one
whose timing remains unchanged for
different phase angles. This signal is fed
to the microcontroller IC2 via resistor
R5. It is evident that this negative edge is
only available once per cycle of the
mains supply, but the MOS-FET needs to
be triggered twice per cycle. For this
purpose, the microcontroller itself
calculates the position of the second
passage through zero.
In this application, microcontroller
ELV 99113 of type PIC 12C508 is
connected to a 455 kHz ceramic
oscillator, Q1. This relatively slow
operating frequency offers the advantage
that the controller only uses 150
μ
A, and
the power supply can be implemented in
a correspondingly power-saving form.
The MOS-FET is activated from the
controller via transistor T2. The 10 V
supply is applied to the gate of the MOS-
FET via resistors R8 and R7. In order to
switch off the MOS-FET, the controller
turns T2 on via R6, so that the gate is at
ground potential. The RC combination
R7, C3, and the gate capacitance of the
MOS-FET are such that the switch-off
edge is modified, i.e. artificially slowed,
so that no further interference
suppression measures are necessary to
conform to the EMC requirement. The
Technical data
Phase switch-off dimmer
Mains voltage
Switched load
Consumer loads: electronic halogen
lamp transformers, filament bulbs
high-voltage halogen lamps
Functions:
Control:
one or more switches
Activation times: 50-400 ms: on/off
230 V 50 Hz
25 W to 300 W*
On, Off, Dim
>400 ms: dim
Dimensions (
xH) 55 x 6.5 mm
* Depends on type of installation -see text
Fig. 5
Principle of the
phase switch-off
dimmer based on
MOS-FET
ELVjournal 5/99
Phase switch-off dimmer
230 V
main voltage
external
control
Halogen
lamp
Control logic
electronic
transformer
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