參數(shù)資料
型號(hào)： MC68HC708MP16
廠商： Motorola, Inc.
英文描述： 8-Bit Microcontroller Units (MCU).(8位微控制器)
中文描述： 8位微控制器單元（MCU）。（8位微控制器）
文件頁數(shù)： 30/44頁
文件大小： 342K
代理商： MC68HC708MP16
Application Note
AN1712
30
MOTOROLA
Figure 16
shows typical PWM waveforms for this drive configuration. In
preparation for the next example, notice that the motor terminal voltage
swings from +Bus to –VBus at a frequency equal to the PWM frequency.
Figure 16. PWM Waveforms Resulting
From Edge-Aligned PWMs
High Performance Servo Controller
This application takes full advantage of the center-aligned PWM output
capability of the 'MP16. To do this, each transistor must be driven with
its own unique PWM signal, as shown in
Figure 17
. The motor current
is limited on a cycle-by-cycle basis by programming fault inputs 2 and 3
for automatic mode and driving them from comparators that monitor the
current in each leg of the H-bridge. Fault input 1 provides overvoltage
protection during regeneration by disabling the PWMs when the DC bus
voltage is too high. For this example, fault input 1 would be programmed
to operate in manual mode.
The software must generate two PWM values: one for the left side of the
H-bridge and one for the right side. If the average of both of these duty
cycles is 50%, something wonderful happens as shown in
Figure 18
.
First, the PWM frequency seen by the motor is twice that applied to each
transistor. This effect alone will reduce the motor ripple current by at
least 6 dB, assuming the frequency is higher than the pole formed by the
electrical time constant of the motor. Second, the peak-to-peak voltage
applied to the motor is half that of the previous example, reducing the
ripple current even further. Also, for the condition of near 0 volt motor
operation where servo requirements are the most stringent, the motor
PWM1
PWM2
MOTOR
+ V
Bus
– V
Bus
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC68HC708MP16CFU 制造商:MAJOR 功能描述:
MC68HC711D3CFBE2 制造商:Freescale Semiconductor 功能描述:
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MC68HC711D3CFNE2 功能描述:8位微控制器 -MCU 8B OTP 192RAM 2 MHZ RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
MC68HC711D3CFNE3 功能描述:8位微控制器 -MCU 8B OTP 192RAM 2 MHZ RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
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