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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST52T400 датащи(PDF) 67 Page - STMicroelectronics |
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ST52T400 датащи(HTML) 67 Page - STMicroelectronics |
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67 / 94 page  ST52T400/T440/E440/T441 67/94 In particular, the pulses are generated by using the rising edge of the signal MAIN1 and the falling edge of the signal MAIN2. Figure 10.6 illustrates the generation of the Triac pulses Tp. The first firing pulse for the Triac is generated on the zero crossing of the power line, while the next pulses are centered on the zero crossing. Gener- ally, the Triac firing pulses start 1/2 Tp before the zero crossing and the length of the pulses is Tp, see Figure 10.6. The length Tp of the pulses is programmable by using a 16 bit value UTP, obtained with REG_CONF19 bits, UTPMSB, and REG_CONF20, UTPLSB (see Figure 10.12 and Table 10.5): TP =TCLKM *UTP The value Tp is in the range [0, 3.2] ms when the clock master is 20 MHz. According to REG_CONF10(0) configuration reg- ister bit, POL, the firing pulses polarity may be set; in order to obtain positive or negative gate Triac currents, allowing to work respectively in I and IV quadrants, or in the II and III quadrants (see Fig- ure 10.6). The pulses polarity can be changed on fly with immediate effect. Working in the II and III quadrant the peripheral implements the following procedure: 1) The firing pulse is set to “1" on the rising edge Figure 10.5 Burst Mode Zero Crossing Circuit Figure 10.6 Burst Mode Zero Crossing Circuit (1) (0.5) 0.5 Ig Negative Triac Gate Current ½Tp Positive Triac Gate Current 1 0 Power Line Ig II and III quadrants I and IV quadrants Tp ½Tp Figure 10.7 Burst Mode Zero Crossing MAIN1 MAIN2 -1.5 -1 -0.5 0 0.5 Main Voltage TRIACOUT Tp Tp Tp |
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