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PDF AN1114 Data sheet ( Hoja de datos )
| Número de pieza | AN1114 | |
| Descripción | BURST MODE TRIAC CONTROL | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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AN1114
® APPLICATION NOTE
BURST MODE TRIAC CONTROL BY USING ST52x301
Authors: A. Cucuccio, M. Lo Presti
1. INTRODUCTION
The aim of this application note is to provide a complete hardware schematic and the software routines
for a system using a Triac in Burst mode driven by the peripherals included in the ST52x301 DuaLogic
microcontroller.
www.DataSThheiest4sUy.scotemm is suitable for thermal regulation in home appliance (i.e. heating system) or in industrial ther-
mal controls. In particular, all the parts useful to develop the above-mentioned application are described
hereafter:
a) 1 power supply for ST52x301, from the mains voltage, in order to drive a triac in quadrant 2 and 3;
b) 1 circuit to detect the pre zero-crossing and post zero-crossing of the triac current;
c) 1 general purpose ST52x301 software to manage the application by using FUZZYSTUDIO™ 3.0
software tool.
Note: The load has been supposed as purely ohmic: in this case it is possible to directly check the
main voltage to detect the zero crossing triac current.
Figure 1 . Triac PinOut Notation
L
G
Load
Il
A2
A1
N
January 1999
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1 page  
BURST MODE TRIAC CONTROL BY USING ST52x301
The following circuit can be used in order to obtain the previous syncronization with the main voltage
then generating a sequence of pulse by the ST52x301 that will be centred on the zero crossing of the
power line.
Figure 6. Burst Mode Zero Crossing Circuit
MAIN1
39k
MAIN2
Vdd
5 Volt
D4
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1
2
220Volt
D2
D3
D1 39k
33K
470K
680K GNDA
1W
1W
The positive and negative half-wave of the mains voltage flows through the diodes D1 and D2. When the
cathode voltage of D3 (D2 anode) is lower 0.6V than the GND level, D3 clamps to 0 volt so that the low
to high and the high to low transition of MAIN1 means the pre-crossing in the rising edge and the post-
crossing in the falling edge respectively.
Vice versa, when the anode voltage of D4 (D1 cathode) is 0.6V higher than the VCC level, D4 clamps to
5 volt so that the low to high and the high to low transition of MAIN2 means the pre-crossing in the falling
edge and the post-crossing in the rising edge respectively. The following figure summarises the previous
considerations.
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BURST MODE TRIAC CONTROL BY USING ST52x301
b) Send block (Send_Ton_to_Triac): insert the value Ton in Triac Counter to set the triac duty cycle.
c) Peripheral block (Start_Triac): this block is necessary to initialize (set button), start (start button) the
triac with the value contained in Triac Counter and enable the TROUT pin of ST52x301 (output button).
d) Arithmetic block: (Increment Ton) this block was included just to show a simple operation to perform
the Ton values. In this case, a simple increment of 1 unit is considered in each cycle.
Ton+=1;
Normally this value is defined by a fuzzy routine or by a standard algorithm for closed loop control.
Figure 14. Main Program Description
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| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet AN1114.PDF ] | |
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