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我正在开发一种电路板,用L6208代替ST GS-D200S,用于预先存在的应用。我已经为此设计和制造了少量的电路板。
我似乎无法从我正在使用的电机中获得适当的扭矩(下面的数据表)。 系统运行在2A和24V。我不确定驱动频率。 此外,当电机正常运行时(虽然扭矩较小),它会间歇性地卡住并产生磨削噪音。 我使用了电荷泵的建议元件值。我的电流检测电阻为.3 OHMS / 2W。我有一个10k和1.15k的分压器,提供Vref,其参考电压大约为。 51.5。 我知道这似乎是非常有限的信息,但如果有人可以提供任何帮助我会非常感激。 特定的电机是HY200 2215 0220 AX04 Motor数据表:http://www-app.etsit.upm.es/departamentos/teat/asignaturas/lab-ingel/mpap_hy_lab.pdf #L6208 以上来自于谷歌翻译 以下为原文 I am working on developing a board to replace the ST GS-D200S with the L6208 for a pre-existing application. I have already designed and manufactured a small amount of boards for this purpose. I can't seem to get the proper torque out of the motor I am using (datasheet below). The system is running at 2A and 24V. I am not sure of the driving frequency. Also, when the motor is running correctly (although with low torque) it will intermittently seize up and make a grinding noise. I used the suggested component values for the charge pump. My current sense resistors are .3 OHMS/2W. I have a voltage divider of 10k and 1.15k supplying the Vref's which gives a ref voltage of approx. .515. I know this seems like very limited information but if anyone can provide any help I would greatly appreciate it. The specific motor is the HY200 2215 0220 AX04 Motor Datasheet: http://www-app.etsit.upm.es/departamentos/teat/asignaturas/lab-ingel/mpap_hy_lab.pdf #l6208 |
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3个回答
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嗨,
我认为问题在于功耗。 GS-D200S是一个模块(每个全桥位于不同的硅IC上),具有巨大的封装,可确保出色的功耗。 L6208是一款完全集成的器件,其中两个半桥位于同一个IC上,封装尺寸更小(效率更低)。 总之,L6208长时间不能承受每个桥的2 A负载电流。在我看来,你有两个选择: - 添加外部散热器,降低热阻 - 降低负载电流(考虑功耗与电流的平方成正比) 以上来自于谷歌翻译 以下为原文 Hi, I think the problem is the power dissipation. The GS-D200S is a module (each full-bridge is on a different silicon IC) with a huge package which guarantee an excellent power dissipation. The L6208 is a fully integrated device where the two half-bridges are on the same IC with a smaller (and less efficient) package. In conclusion, the L6208 cannot sustain the load current of 2 A for each bridge for a long time. In my opinion you have two options: - Add an external heat sink decreasing the thermal resistance - Reduce the load current (consider that the power dissipation is proportional to the square of the current) |
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嗨恩里科,
谢谢回复。 添加散热器应该不是问题,我在电路板上留下了足够的空间来安装大型散热器。 你能帮我回答这两个问题吗? 在GS-D200S模块中,可以通过在OSC和GND之间添加一个电容来降低振荡器频率。在数据表中,该频率计算为...... Cf = 80.5-4.7fc / fc = nf(其中fc = khz)。我知道在这个应用中,使用的电容值是4.7nF。你能告诉我你认为这相当于什么频率(我计算8.56kHz)。 然后根据该信息,您可以告诉我在您使用电机的情况下,您认为使用L6208N获得相同频率的适当值(参见数据表原始文章)。 非常感谢您的帮助.... 以上来自于谷歌翻译 以下为原文 Hi Enrico, Thanks for the reply. Adding a heat sink shouldn't be a problem, I left sufficient room on the board for mounting a large one. Can you answer these two questions for me... In the GS-D200S module the oscillator frequency can be lowered by adding a capacitor between OSC and GND. In the data sheet this frequency is calculated as.... Cf= 80.5-4.7fc/fc =nf (where fc = khz). I know that in this application the capacitor value used is 4.7nF. Can you tell me what frequency you believe this to amount to (I calculate 8.56kHz). Then with that information can you tell me what values you think would be appropriate to achieve the same frequency with the L6208N given the motor being used (see original post for datasheet). Thank you very much for your help.... |
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好的,首先L6208使用与GS-D200S不同的控制方法。
L6208实现固定关断时间PWM控制,不允许获得恒定的开关频率。 在任何情况下,您都可以获得大约8.56 kHz的开关频率,将关闭时间(0.6 x R x C)设置为大约目标周期的90%(约105 us)。 由10 nF电容和18 kOhm电阻组成的RC网络应满足您的需求。 以上来自于谷歌翻译 以下为原文 Ok, first of all the L6208 uses a different control method than GS-D200S. The L6208 implements a fixed off time PWM control which does not allow to obtain a contant switching frequency. In any case you can obtain a switching frequency of about 8.56 kHz setting the off time (0.6 x R x C) equal to about the 90 % of the target period (about 105 us). A RC network composed by a 10 nF cap e a 18 kOhm resistor should fit your needs. |
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