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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PIC18F23K22-E/ML датащи(PDF) 197 Page - Microchip Technology |
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PIC18F23K22-E/ML датащи(HTML) 197 Page - Microchip Technology |
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197 / 496 page  2010 Microchip Technology Inc. Preliminary DS41412C-page 197 PIC18(L)F2X/4XK22 14.4.5 PROGRAMMABLE DEAD-BAND DELAY MODE In Half-Bridge applications where all power switches are modulated at the PWM frequency, the power switches normally require more time to turn off than to turn on. If both the upper and lower power switches are switched at the same time (one turned on, and the other turned off), both switches may be on for a short period of time until one switch completely turns off. During this brief interval, a very high current (shoot- through current) will flow through both power switches, shorting the bridge supply. To avoid this potentially destructive shoot-through current from flowing during switching, turning on either of the power switches is normally delayed to allow the other switch to completely turn off. In Half-Bridge mode, a digitally programmable dead- band delay is available to avoid shoot-through current from destroying the bridge power switches. The delay occurs at the signal transition from the non-active state to the active state. See Figure 14-16 for illustration. The lower seven bits of the associated PWMxCON register (Register 14-6) sets the delay period in terms of microcontroller instruction cycles (TCY or 4 TOSC). FIGURE 14-16: EXAMPLE OF HALF- BRIDGE PWM OUTPUT FIGURE 14-17: EXAMPLE OF HALF-BRIDGE APPLICATIONS Period Pulse Width td td (1) PxA(2) PxB(2) td = Dead-Band Delay Period (1) (1) Note 1: At this time, the TMRx register is equal to the PRx register. 2: Output signals are shown as active-high. PxA PxB FET Driver FET Driver V+ V- Load + V - + V - Standard Half-Bridge Circuit (“Push-Pull”) |
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