ST52T301 datasheet(51/100 Pages) STMICROELECTRONICS

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with inductive load (i.e. universal or monophase

motors). In the figure 10.8 is shown the relation

between the Phase Angle

α and the Current flow

angle

γ . The peripheral allows to control the Phase

Angle or equivalently the time T1 (see Figure 10.9).

It is possibleto changeTime T1 settingthe contents

of the peripheral register PERIPH_REG_1. This

value could be directly loaded by using one of the

two fuzzy outputs or by using a value coming from

the Registers File, according with INPSL and FZSL

configurationbits of REG_CONF12 (seeTable 10.6

and Figure 10.13).

In order to synchronizethe peripheral with the zero

crossing of the main voltage the two pins MAIN1

and MAIN2 must be connected together if the

externalcircuit is the one shownin the Figure10.10.

It is possible to use different circuits for the zero

crossing detection, but the MAIN1 signal rising

edge must be synchronized with a main voltage

zero crossing and the MAIN2 signal falling edge

(1.5)

(1)

(0.5)

0.5

1.5

Mains

Voltage

10 mS

20 mSec

Tmax

8mS

Tr/2

Figure 10.9 Phase Angle Partialization mode

Figure 10.10 Phase Angle Partialization Zero Crossing

must be synchronized with the following main

voltage zero crossing, always.

The peripheral can be programmed in order to work

with 50 or 60 Hz main voltage frequency by setting

the REG_CONF10(6) bit, PSF (see Table 10.4).

If main voltage frequency is equal to 50 Hz, then Tr,

see figure 10.9, is equal to 20 mSec and T1 is:

T1 = PERIPH_REG_1(0:7)*(1/25.5)ms.

The length of the semiperiod Ti/2 is programmable

by using the registers REG_CONF12(0:5) and

REG_CONF13, (see figure 10.12).By using a clock

master equal to 20 MHz the pulse width is in the

range from 0.2 to 250

µs. The duty cycle of Ti is

always 50 %.

In order to avoid problems for the Triac firing when

the load is inductive 8 different pulses are

generated by the peripheral.

If the time T1 is bigger than a fixed time Tmax then

no pulses are generatedand the Triac is maintained

off. This feature was implemented in order to avoid

the firing of the Triac in the second half period of

the main voltage. The firing pulses are generated

when the contents of the PERIPH_REG_1 is less

or equal to 204, otherwise they are not generated.

When the frequency of the main voltage is 50 Hz,

T1max is equal to 8 mSec.

It is possible to generate a programmable interrupt

in four different ways:

1) no Interrupt;

2) Interrupt on the rising edge of the signal MAIN1

3)Interrupt on the falling edge of the signal MAIN2

4) Interrupt on both the edges of the signal MAIN1.

The Interrupt is programmableby using the register

REG_CONF11(7:6), INTSL

10.4. TRIAC/PWM DRIVER PROGRAMMING

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