I am looking for a designer to design an inverter with the following characteristics:
- Single phase
- Grid tied
- High voltage dc input ( around 300-450) to 230v 50hz ac (power around 500w)
- Efficiency is the top priority. Component costs is not a limit.
- It must use stm32 cortex-m mcu. Programing is not needed
What I need:
- Schematic and layout in Altium designer
技能： 电路设计, 电機工程, 电子, 印制板布局
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I'm looking for a electronics engineer to answer questions that I have on projects that I am completing on a case by case basis. I'm looking for someone who can respond in a reasonable time and is able to answer a broad array of questions. I'll be looking to hire on a per 1 / 5 / 10 / 15 / 30 minute basis, depending on what the prefer of the engineer is.
All the best,
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I need to Extract the ACM parameters of NMOS in Cadence. i have all the specifications needed for this task. please get in touch with me for further details
技能： 电路设计, 电機工程, 电子, 工程, 印制板布局
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状态： 未托管 关注： 截止交稿时间： 2019-01-26
Find out why MAX20331 High-Voltage Protection 3.5mm Audio Line OVP IC is important in India market.
Rumor says MAX20331 was designed for India mobile market because there's a chance that high voltage can get into mobile phones's 3.5mm headphone jack. Why this case happens in India but not in other countries like USA?
Is it because there's a similar looking jack on their cars/trucks/scooters that people can plug into the wrong hole by mistake?
Please help me investigate and find out the reason, provide detailed use scenario with photos.
I want to know why every cell phone selling in India wants a MAX20331 inside to protect the 3.5mm headphone jack, but cell phones selling to other countries don't need this IC?
技能： 电路设计, 电機工程, Electronic Design, 电子
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We have an existing circuit that is an H-bridge for controlling a thermoelectric cooler. It works and is controlled by software as far as the control algorithm, but this circuit has two resistors that set the heating and cooling current limits. We want to change these fixed resistors to trimpots, so that the heat and cool current limits can be adjusted. We also need to know the relationship between the voltage at the opamp side of these current limit resistors, and the current limit, so that when we dial up the current limits by adjusting the trimpots we can measure what the current limits are that we are setting.
Attached is a schematic of this circuit. We feed in the voltage from a DAC (0-3.3V), and this is multiplied by x7 by U1B. The output of U1B determines which MOSFET pair in the H-bridge fires to heat, or cool. If the voltage out of U1B is less than Vtec (input at J4 over a range of 5 - 20V), then the system cools. If this voltage is greater than Vtec the system heats. We monitor the load thermistor as well as Vtec with our microcontroller and run the control algorithm.
The cooling limit resistor is R6 (fixed at 20K now) and the heating current limit is R8 (fixed at 15K now so the the heating limit is somewhat less than the cooling limit). With these values, the maximum current is equal to Vtec/4, and we want to know why that is the case, and how R6 and R8 determine this.
All of this works, and we only want to change R6 and R8 to trimpots, and know the relationships between their values and the heat/cool current limits. Also, we need to know the relationship between the voltage at the opamp sides of R6 and R8, and the cool and heat current limits so that we can measure the current limits as we adjust R6 and R8 (after changing these to trimpots).
技能： 电路设计, 电機工程, 电子, 微控制器, 印制板布局
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