參數(shù)資料
型號: ST52T301P
廠商: 意法半導(dǎo)體
英文描述: 8-Bit OTP/EPROM DuaLogic] MCUs WITH ADC, UART, TIMER, TRIAC & PWM DRIVER
中文描述: 8位檢察官辦公室/存儲器DuaLogic]與藝術(shù)發(fā)展局和UART,定時器,可控硅控制器
文件頁數(shù): 48/100頁
文件大?。?/td> 497K
代理商: ST52T301P
10.2BURSTMODE
When REG_CONF10 (3:2) bits, MODE, are ”10”
the peripheral is programmed to work in BURST
MODE.
Notice that when you are working in Burst mode
CKSL must be set to ”1x”
.(see Table 10.4)
A square wave, Tb, is generated with a duty cycle
proportional to the power the user intends to
transferon the load.A pulse is generatedfor each
zero crossing of the main voltage included in the
Ton of the fixed period. Figure 10.4 shows the
typicalBurstControlworkingmode.TheperiodTof
thesignalTb (seeFigure10.4)is equalto 256*Tck.
ThesignalTckisgeneratedprogrammingthe16-bit
Prescaler, by REG_CONF8 and REG_CONF9
(seeFigure 10.2).Tck is equalto themain voltage
frequency(50 or 60 Hz) divided by N+1, where N
value is from0 to 2
16
-1.
The value Ton is proportional to a value,
INIT_VALUE,thatcan be a fuzzyoutput or a value
coming from Register File, according with the
INPSL and FZSL configuration bits of
REG_CONF12 (seeTable10.6 and Figure10.12).
On TRIACOUT pin is generated a sequence of
pulses, programmed, by using REG_CONF11(0)
bit,POL (see Table10.5), in order to be positiveor
negative, to drive the Triac in different quadrants.
The number of generatedpulses, N_PULSES, is:
N_PULSES= 2 [(N+1)*INIT_VALUE- N]
where N is the value stored in the 16-bit pescaler.
ThenTon = (N_PULSES/ 2)* T
POWER LINE
The first pulse is obtained during the first zero
crossing of the main voltage and the last one is
generated after INIT_VALUE*Tck clock pulses,
where Tck is the Prescaler output, generated by
usingthemainvoltagefrequencyappliedto MAIN1
and MAIN2 pins.
Theperipheralcanbeprogrammedinordertowork
with50 or 60Hz mainvoltagefrequency,bysetting
theREG_CONF10(6)bit, PSF (seeTable 10.4).
Ranges of the Tb signal period depend on the
powerline frequency(see Table10.3).
In order to drivea Triacin BurstModeit is required
to generate a sequence of pulse, that must be
centred on the zero crossing of the power line as
shownin the Figure 10.7. For this reason, the pre
zero crossing and the post zero crossing of the
powerline must be detected.
To detect the zero-crossing and get also the main
voltagefrequency,the user must generateMAIN1
and MAIN2 signals, by using the circuit shown in
Figure10.6.
MAIN1 and MAIN2 signals are used in the block
called PULSEGENERATORof theperipheral(see
Figure10.1).
In particular the pulsesare generatedbyusing the
rise edge of thesignal MAIN1 and the falling edge
of the signal MAIN2.
Figure 10.5 shows the generation of the Triac
pulsesTp .
The first firing pulse for the Triac is generated on
the zero crossing of the power line, while the next
pulsesare centredon the zerocrossing.
Power Line
Frequency
T
min
5.12 s
max
50 Hz
335544 s
60 Hz
4.26 s
279620 s
Table10.3.TRIACOUT Signal Period
-1.5
-1
-0.5
0
0.5
1
1.5
Ton
Tb
Power
Line
TRIACOUT
T = 256 * Tck
Figure10.4.BurstWorking Mode
48/99
ST52T301/E301
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