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Results tagged with power-electronics
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user 1592
1
vote
Accepted
AC/DC Laptop adapter power losses
Lenovo ADL170NLC3A has an Energy Star V (ES 2.0) rating. Energy Star states to get that rating for nameplate output power ($P_{no}$) > 45W, the Minimum Average Efficiency in Active Mode ≥ 87%.
At nom …
- 2,497
2
votes
Accepted
Power Electronics Project
You will need more than a 220V:12V transformer.
Fullwave bridge rectifier output:
$$ V_{DC} = 0.637\ V_{MAX} = 0.9\ V_{RMS}$$
This is the generic formula (textbooks), which gives you 10.8V. Higher cu …
- 2,497
3
votes
What is the function of jumper pins on a 4 channel relay?
Each channel can be set to be triggered high or low.
See User Manual
- 2,497
1
vote
Accepted
What are the LENOVO YOGA 3 USB-like inlet 20V 2A wiring/signal/voltage specs?
The image is poorly focused and laptop name is not specific to identify model, but it appears to be a Lenovo YOGA 3 Pro, 6 pin USB/charging port.
The USB port is dual purpose. USB and charging (20V). …
- 2,497
4
votes
Accepted
Why is it bad to run power through BNC (RG58) cables?
Because it is not a power cable (Q1) using power connectors (Q2).
BNC cable has a solid conductor and a ground braid to electrically shield and mechanically protect the conductor.
Electrical reason: …
- 2,497
1
vote
Designing a loaded voltage divider?
Your circuit works. Proper ground connection.
Your battery would be +12V -(-8V) = 20V. Voltage at Point A = 12V, Point B = 9V, Point C = 4V and Point D = 0V. The circuit is a good place to start.
T …
- 2,497
13
votes
Accepted
What is it about the cabin electrical supply on cruise ships that makes surge protectors dan...
From USCG Surge Protective Devices Onboard Vessels
A marine casualty investigation of two separate stateroom fires onboard a U.S. Flag Container ship revealed that the sources of the fires were attr …
- 2,497