[问答]

12F683在一角硬币上停止PWM间隔

问答对人有帮助，内容完整，我也想知道答案 0 12F68 3停止PWM间隔在DME12F68停止PWM间隔后，X PulsPic 12F68 3FoSC 8MHZTO硬币的表达，我想停止PWM模式上的“一角硬币”。即在X数的PWM脉冲（在50%占空比）之后。查看数据表DS41211D页79 -表11-3：示例PWM频率和分辨率（FoSC＝8 MHz），我在76.92千赫上使用PWM模式，恰好与列4一样。76.92 kHz，time2预刻度1，PR2值0x19，占空比50%，在某些情况下，在准确的100个脉冲之后，需要关闭。什么是在预定数量的脉冲之后停止PWM模式的一些方法？CCP模块可以预先编程，并有一个停止的时间吗？有没有登记的登记册？如果没有自动停止计数器，那么FWWI就已经有一个中断服务例程来代替其他事情。我用Time0编程，每秒9600点。如果必要的话，我可以改变频率。我可以添加一个软定时器计数器，它会增加，检查，然后禁用ISPWM右PWM之前，我写自己的BAT BAR软停止，我想我会张贴一个消息。停在一角硬币上的原因是软启动，以在由PWM驱动的LLC 1/2桥电源上充电电容器。这是为了改造EnECSE太阳能微逆变器固件。他们制造和销售了300000个故障率很高的微型逆变器。吹制整流二极管是一种常见的故障模式。当你用示波器测量高压直流整流二极管的电流时，你可以看到和测量远远超过二极管规格的大电流。这只发生在滤波电容器低或完全放电时。帽电压越低，斜坡上升越长。在这个PWM驱动的574伏HVDC电源上有6个非常大的电容器。当电容器完全放电时，它对二极管施加了巨大的压力。我想写一些测试代码，在一分钱上停止，这样我就可以查看范围，看看这是否能治愈二极管过流问题。我想用PWM占空比测试β保持在50%。因此，通常使用软启动的占空比变化技巧，因为它驱动1/2桥功率，总是需要至少50%的占空比才能稳定。如有任何建议，将不胜感激。密苏里圣路易斯固件返工项目以上来自于百度翻译以下为原文 12F683 Stop PWM Interval on a dime 12F683 Stop PWM Interval after x pulses Pic 12F683 FOSC 8mhz To coin an expression, I want to stop the PWM mode on a "dime". i.e. After x number of PWM pulses (at a 50% duty cycle). Look at data sheet DS41211D-page 79 - TABLE 11-3: EXAMPLE PWM FREQUENCIES AND RESOLUTIONS (FOSC = 8 MHz) I'm using PWM mode at 76.92 kHz exactly like column 4. 76.92 kHz, Timer2 Prescale 1 and PR2 Value 0x19, 50% duty cycle. In some cases after exactly 100 pulses it needs to be turned off. What are some ways to stop the PWM mode after a predetermined number of pulses? Can the CCP module be preprogramed with a time to stop ? Is there a register that can be polled ? If there is no automatic stop counter then FWIW I already have an interrupt service routine in place for other things. I'm using timer0 programmed at 9600 ticks per second. I can change the frequency if necessary. I can add a soft timer counter that gets incremented, checked and then disable the PWM right in the ISR Before I write my own bit bang soft stop I thought I would post a message. The reason for stopping on a dime is a soft start to charge up capacitors on an LLC 1/2 bridge power supply driven by the PWM. This is for reworking the enecsys solar micro inverter firmware. They went out of business after making and selling 300,000 micro inverters with a high failure rate. Blown rectifier diodes is a common mode of failure. When you use an oscilloscope to measure the current across the HVDC rectifier diodes you can see and measure massive over current far beyond the specs of the diodes. This only happens when the filter capacitors are low or fully discharged. The lower the cap voltage then the longer the ramp up. There are 6 very large capacitors across a 574 volt HVDC power supply driven by this PWM. When the capacitors are fully discharged it puts enormous stress on the diodes I want to write some test code that stops on a dime so I can look on a scope and see if this cures the diode overcurrent problem during boot up. I want to beta test with the PWM duty cycle always maintained at 50% . so the duty cycle VARYING trick commonly used for soft start cant be used in the case because its driving a 1/2 bridge LLC power that always needs at least 50% duty for stability. Any suggestions would be appreciated. Dan - Enecsys firmware rework project St Louis Missouri 0
2019-1-3 14:50:03　　评论淘帖0 邀请回答您可以邀请以下用户，快速回答问题 × qun333 该类别下有 57 个回答。邀请回答技术发广告该类别下有 56 个回答。邀请回答 caoguiqun 该类别下有 56 个回答。邀请回答 psw30 该类别下有 44 个回答。邀请回答伊丹姿子该类别下有 41 个回答。邀请回答 uwufwjrw 该类别下有 39 个回答。邀请回答 hetao1111 该类别下有 38 个回答。邀请回答 lc123617 该类别下有 35 个回答。邀请回答欧阳大大该类别下有 32 个回答。邀请回答作死不止该类别下有 31 个回答。邀请回答 asd010 该类别下有 31 个回答。邀请回答 60user92 该类别下有 29 个回答。邀请回答 wy8719 该类别下有 29 个回答。邀请回答 haikitty 该类别下有 28 个回答。邀请回答 ju978779 该类别下有 28 个回答。邀请回答嘻嘻爱哈哈该类别下有 28 个回答。邀请回答 xiuzhen122 该类别下有 27 个回答。邀请回答 pol666 该类别下有 27 个回答。邀请回答 ueywyrsdfs 该类别下有 26 个回答。邀请回答 lhly23 该类别下有 25 个回答。邀请回答举报张婷婷相关推荐 • 怎么使用12F683将ADC转换为PWM 1537 • 如何将初始数据放入ASM程序中？ 1203 • PIC12F683无延迟闪烁 1472 • 12F683 97％完全需要优化反馈 1396 • 怎么用matlab实现对硬币的识别与分类 9411 • PIC12F683闪烁代码在MPASM汇编器中不起作用 1174 • 设置ISR应该选哪个计时器？ 1210 • 有人可以帮我编写PIC12F683吗？（用作电压比较器） 2060 • 12F675在循环中将如何运行？ 1156 • PICKIT 3访问编程的PIC12F683时出现问题 4128 2个回答

答案对人有帮助，有参考价值 0 使用定时器中断服务来驱动PWM的计时器。假设你没有在定时器上使用一个后定标器，你得到一个脉冲每一个中断，所以只需计数中断。不，硬件中没有什么可以为你计数循环。以上来自于百度翻译以下为原文 Use the timer interrupt service for the timer driving the PWM. Assuming you are not using a post-scaler on the timer, you are getting one interrupt per pulse, so just count interrupts. No, there is nothing in the hardware to count cycles for you.

2019-1-3 15:06:08 评论举报王焕树

答案对人有帮助，有参考价值 0 好的……-谢谢以上来自于百度翻译以下为原文 OK...Will do - Thank you

2019-1-3 15:12:13 评论举报许晓凌