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AN2154 Datasheet(PDF) 12 Page - STMicroelectronics |
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AN2154 Datasheet(HTML) 12 Page - STMicroelectronics |
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12 / 16 page  ST7MC implementation of symmetrical SVPWM AN2154 12/16 it follows that T0-t0 is simply equal to ~t0 (i.e. NOT(t0)). In addition, considering the equation: Equation 19 it is possible to express Phase X compare registers (X=U, V, W) as function of only ta and tb (Fcounter dependency will be omitted from this point on): Equation 20 Equation 21 Equation 22 A similar line of reasoning can be followed for the other sectors.Table 2 shows the values to be loaded into the Phase U, V and W compare registers depending on the sector in which vector V is located. Table 3 lists and shortly describes the variables utilized in SVPWM algorithm, while Figure 8 shows the algorithm block diagram. Table 2. Compare registers values Sector Phase U compare register (MCPUH) Phase V compare register (MCPVH) Phase W compare register (MCPWH) 0 1 2 3 4 5 t 0 2 ---- T 0 t a t b + () – () 2 ----------------------------------- t a t b ∼ () 2 ------------------ = = t a t b + ∼ () 2 --------------------------- ⎝⎠ ⎛⎞ ∼ Phase U compare register = t a t b + ∼ () 2 --------------------------- ⎝⎠ ⎛⎞ t a + ∼ Phase V compare register = t a t b + ∼ () 2 --------------------------- ⎝⎠ ⎛⎞ ∼ Phase W compare register = t a t b + () ∼ () 2 -------------------------------- t a t b + ∼ () 2 --------------------------- ⎝⎠ ⎛⎞ t a + ∼ t a t b + ∼ () 2 --------------------------- ⎝⎠ ⎛⎞ ∼ t a t b + () ∼ () 2 -------------------------------- t a t b + ∼ () 2 --------------------------- ⎝⎠ ⎛⎞ ∼ t a t b + ∼ () 2 --------------------------- ⎝⎠ ⎛⎞ ∼ t a t b + () ∼ () 2 -------------------------------- t a + t a t b + ∼ () 2 --------------------------- ⎝⎠ ⎛⎞ ∼ t a t b + () ∼ () 2 -------------------------------- t a t b + ∼ () 2 --------------------------- ⎝⎠ ⎛⎞ ∼ t a t b + ∼ () 2 --------------------------- ⎝⎠ ⎛⎞ t b + ∼ t a t b + () ∼ () 2 -------------------------------- t a t b + ∼ () 2 --------------------------- ⎝⎠ ⎛⎞ ∼ t a t b + () ∼ () 2 -------------------------------- t a t b + ∼ () 2 --------------------------- ⎝⎠ ⎛⎞ t a + ∼ t a t b + ∼ () 2 --------------------------- ⎝⎠ ⎛⎞ t b + ∼ t a t b + () ∼ () 2 -------------------------------- t a t b + ∼ () 2 --------------------------- ⎝⎠ ⎛⎞ ∼ |
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