Deriving Power Electronics from Transistors and Microcontrollers: Difference between revisions
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*Slide 12 of [[Open_Source_PV_System#Initial]] shows max power point - current at about 9A and voltage at 31V - for PV panels. | *Slide 12 of [[Open_Source_PV_System#Initial]] shows max power point - current at about 9A and voltage at 31V - for PV panels. | ||
==1kW== | <html><iframe src="https://docs.google.com/presentation/d/e/2PACX-1vRHpbad5pGYGcCWSeY0NlQAWeJFCKT2CvK5a_IIZITfDCyAx4lD9WRG0yQnfmbFQ9C3fhV_rbbnw-TP/embed?start=false&loop=false&delayms=3000" frameborder="0" width="480" height="299" allowfullscreen="true" mozallowfullscreen="true" webkitallowfullscreen="true"></iframe></html> | ||
[https://docs.google.com/presentation/d/1_kUzO4eRCqrHVpqxSSTs17oLhtikTTyYe_1NxrTKlTI/edit#slide=id.g1861bf60d5_0_6 edit] | |||
==1kW-10kW== | |||
*4 PV panels in series at 120VDC. 9A. | *4 PV panels in series at 120VDC. 9A. | ||
*Arduino produces a square wave at 60 Hz at 50% duty cycle | *Arduino produces a square wave at 60 Hz at 50% duty cycle | ||
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*Gate drivers - Arduino doesn't have enough juice to power IGBT gate efficiently - [4] $1 - [https://www.mouser.com/productdetail/?qs=r%2FVmNO8Tjq5kfT%2FCttKvgw%3D%3D] | *Gate drivers - Arduino doesn't have enough juice to power IGBT gate efficiently - [4] $1 - [https://www.mouser.com/productdetail/?qs=r%2FVmNO8Tjq5kfT%2FCttKvgw%3D%3D] | ||
==10kW== | ==10kW-100kW== | ||
*Let's see cost of 54kW - | |||
*At 240V - need strings of 8 solar panels in series | |||
*Protection - 225 amp circuit breaker - $75[https://www.menards.com/main/electrical/circuit-protection-distribution/circuit-breakers/c-1489583170892.htm?Spec_MaximumAmperage_facet=225&ipp=36] | *Protection - 225 amp circuit breaker - $75[https://www.menards.com/main/electrical/circuit-protection-distribution/circuit-breakers/c-1489583170892.htm?Spec_MaximumAmperage_facet=225&ipp=36] | ||
*54kW for the above | |||
*Inversion - Just scale the IGBTs above. Use 3 instead of 1 for | |||
*For 54kW - switching and controller cost is $75 for DC source. Rest is safety and cooling. | |||
=Induction Furnace= | =Induction Furnace= | ||
=Welder= | =Welder= | ||
Latest revision as of 00:42, 11 February 2018
Introduction
With the principle of Part Count Reduction within OSE's Module Based Design approach - we are interested in using this principle to facilitate the design of electronic circuits, and in particular, power electronic circuits.
With low cost microcontrollers (700 Mhz Pi Zero is $5) and transistors (IGBTs are $1/kW of power handling) - we can design low cost power electronics. Let's look at how this can be done for simple learning circuits which can serve as a basis of robust industrial applications. These examples show the limits of power for various devices.
Inverter
- 10kW direct solar power inverter case using Arduino and IGBTs for $25. Inverter at 120V for regular loads such as power tools.
- Start with 1kW of PV for test, then move to 10kW.
- 10kW case is scalable to 100kW
- Slide 12 of Open_Source_PV_System#Initial shows max power point - current at about 9A and voltage at 31V - for PV panels.
1kW-10kW
- 4 PV panels in series at 120VDC. 9A.
- Arduino produces a square wave at 60 Hz at 50% duty cycle
- Inversion occurs through an H bridge
- Cost: [4] $4 for IGBTs (18kW continuous) [1]
- Gate drivers - Arduino doesn't have enough juice to power IGBT gate efficiently - [4] $1 - [2]
10kW-100kW
- Let's see cost of 54kW -
- At 240V - need strings of 8 solar panels in series
- Protection - 225 amp circuit breaker - $75[3]
- 54kW for the above
- Inversion - Just scale the IGBTs above. Use 3 instead of 1 for
- For 54kW - switching and controller cost is $75 for DC source. Rest is safety and cooling.