參數(shù)資料
型號(hào)： L6229QTR
廠商： STMICROELECTRONICS
元件分類(lèi)： 運(yùn)動(dòng)控制電子
英文描述： BRUSHLESS DC MOTOR CONTROLLER, 2.8 A, QCC32
封裝： 5 X 5 MM, 1 MM HEIGHT, 0.50 MM PITCH, ROHS COMPLIANT, VFQFPN-32
文件頁(yè)數(shù)： 8/28頁(yè)
文件大?。?/td> 521K
代理商： L6229QTR
Circuit description
L6229Q
16/28
Doc ID 15209 Rev 3
5.4
Slow decay mode
Figure 13 shows the operation of the bridge in the slow decay mode during the off time. At
any time only two legs of the three-phase bridge are active, therefore only the two active
legs of the bridge are shown in the figure and the third leg will be off. At the start of the Off
Time, the lower power MOS is switched off and the current recirculates around the upper
half of the bridge. Since the voltage across the coil is low, the current decays slowly. After
the dead time the upper power MOS is operated in the synchronous rectification mode
reducing the impedance of the freewheeling diode and the related conducting losses. When
the monostable times out, upper MOS that was operating the synchronous mode turns off
and the lower power MOS is turned on again after some delay set by the dead time to
prevent cross conduction.
Figure 13.
Slow decay mode output stage configurations
5.5
Decoding logic
The decoding logic section is a combinatory logic that provides the appropriate driving of the
three-phase bridge outputs according to the signals coming from the three hall sensors that
detect rotor position in a 3-phase BLDC motor. This novel combinatory logic discriminates
between the actual sensor positions for sensors spaced at 60, 120, 240 and 300 electrical
degrees. This decoding method allows the implementation of a universal IC without
dedicating pins to select the sensor configuration.
There are eight possible input combinations for three sensor inputs. Six combinations are
valid for rotor positions with 120 electrical degrees sensor phasing (see Figure 14, positions
1, 2, 3a, 4, 5 and 6a) and six combinations are valid for rotor positions with 60 electrical
degrees phasing (see Figure 15, positions 1, 2, 3b, 4, 5 and 6b). Four of them are in
common (1, 2, 4 and 5) whereas there are two combinations used only in 120 electrical
degrees sensor phasing (3a and 6a) and two combinations used only in 60 electrical
degrees sensor phasing (3b and 6b).
The decoder can drive motors with different sensor configuration simply by following the
Table 8. For any input configuration (H1, H2 and H3) there is one output configuration (OUT1,
OUT2 and OUT3). The output configuration 3a is the same than 3b and analogously output
configuration 6a is the same than 6b.
The sequence of the Hall codes for 300 electrical degrees phasing is the reverse of 60 and
the sequence of the Hall codes for 240 phasing is the reverse of 120. So, by decoding the 60
A) ON TIME
B) 1
μs DEAD TIME
C) SYNCHRONOUS
RECTIFICATION
D) 1
μs DEAD TIME
D01IN1336
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