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参数资料
| 型号： | IRPLDIM2a |
| 厂商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Digitally Addressable DALI Dimming Ballast Reference Design |
| 中文描述： | 大理数字可寻址调光镇流器参考设计 |
| 文件页数： | 3/15页 |
| 文件大小： | 241K |
| 代理商： | IRPLDIM2A |
www.irf.com
3
IRPLDIM2a
FUNCTIONAL DESCRIPTION
The IRPLDIM2 Demo Board consists of an EMI filter, an active power factor correction front end, a ballast control
section, a digital control section and a resonant lamp output stage. A block diagram of the design is shown in
Figure 3.
The EMI filter blocks ballast generated noise. The power factor correction is used for sinusoidal input current and
a regulated DC bus. The ballast control section provides frequency modulation control of a traditional RLC lamp
resonant output circuit for preheating, igniting and ballasting the lamp. It is easily adaptable to a wide variety of
lamp types. The digital control section provides the Digitally Addressable Lighting Interface (DALI) and the neces-
sary circuitry and software to perform closed-loop dimming, lamp fault detection, shutdown and auto-restart.
You can connect the board directly to the DALI input (2 connections) or you can use the RS232/DALI converter
board (for demo purposes with the IRPLDIM2 board) to connect it to the PC.
The ballast control circuit uses the IR21592 Dimming Ballast Control IC programmed by the PIC16F628
microcontroller. The IR21592 controls the ballast according to the signals received from the microcontroller. The
microcontroller is connected to the ballast and the IC to receive diagnostic signals.
The communication between the ballast and the external world is done with two signals: TX (digital serial signal
transmitted from the network to the microcontroller) and RX (digital serial signal from the microcontroller to the
network). This system allows the ballast to communicate bi-directionally with the network (a PC or generally a
DALI system). A digital interface assures high voltage isolation between DALI inputs and the resonant lamp output
stage. The microcontroller manages the communication between interface and ballast IC.
The complete circuit is shown in Appendix A. In the circuit thick races represent high frequency and high current
paths. Lead lengths should be minimized to avoid high-frequency noise problems. Appendix B shows the Bill of
Materials.
Fig. 3 IRPLDIM2 Block diagram
IRPLDIM2 Reference Design
OPTO
Interface
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
I
FMI
N
VDC
VCO
CPH
DIM
MAX
MIN
IPH
LO
CO
M
VCC
VB
VS
HO
SD
CS
1
2
3
4
5
6
7
8
18
17
16
15
14
13
12
11
P
RA2
RA3
RA4
RA5
VSS
RB0
RB1
RB2
RB7
VDD
RA6
RA7
RA0
RA1
RB5
RB6
9
10
RB3
RB4
EMI Filter
L
Rectifier
PFC
Output Stage
Lamp
PC
Interface
Micro
IR-IC
Half Bridge
Driver
Dimming Feedback
Preheat Feedback
Lamp Fault
light level
Fade time
Fade rate
On/Off
Fault condition
actual level
light status
ballast
DALI
input
RS232/
DALI
converter
N
E
NOTE: Ballast can also be
connected directly to a DALI
compliant system..
PC and RS232/DALI converter
are used for demo purposes.
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