All Questions
26
questions
0
votes
0
answers
22
views
AC-to-DC rectifier and DC-to-DC converter
I am currently doing an assignment featuring an AC-DC EV Charger topology as shown below.
I have obtained answers for (a) and (b). However, I am unable to derive the equation exactly as given in the ...
- 47
3
votes
1
answer
73
views
What are these resistors used in this flyback converter?
I'm new to designing flyback converters. I noticed resistors connecting the primary and auxillary coils. Can somebody explain the usage of these resistors for me.
The IC in this schematic is a CR1510. ...
- 31
0
votes
0
answers
30
views
Understand firing angle chart in dual converter
How to understand below Firing Angle Chart,
I guess the y axis should be voltage of the source, but what is the x axis, why a1/a2 points right, the location of 0⁰/90⁰/180⁰ seems quite strange.
Hints ...
- 95
0
votes
0
answers
166
views
How does an AFE boost voltage?
I have an active front end unit that is connected to a 3 phase system. It's controlled via software and I can set a value for the DC bus voltage.
When the input is the AC 3-phase, how does this ...
- 153
1
vote
2
answers
1k
views
Reusing a HP laptop charger of 3 wires (logic inside)
I have an HP laptop charger 18.5v 3.5A (1X2057... WBGST0A...)
In the past the charger was working fine and I removed the tip for an experiment, so I can't check wires measuring the original tip.
Wires ...
- 155
0
votes
3
answers
219
views
Safety in AC/DC converter [closed]
To make an AC/DC converter with 230 V input, I have seen several circuits. Circuits that use a transformer to lower the voltage and that filter the signal to obtain a stable low voltage. I have also ...
0
votes
3
answers
231
views
Connect rectifier to DC power source? [closed]
I'm thinking about DC appliances and energy efficiency.
A common appliance like an air conditioner has a rectifier to convert 230V AC into 50V DC. If I connect the appliance directly to 50V DC instead ...
- 1
0
votes
1
answer
1k
views
AC to DC converter that outputs positive and negative voltage [closed]
I have to design a power supply that takes AC, converts to DC and outputs 9V and -9V with respect to ground. The current being handled is no greater than 100mA (Possibly much smaller than 100mA). The ...
- 263
2
votes
3
answers
260
views
Design considerations for 3-phase AC-DC converter 60 vs 400 Hz
If I want to convert 400 Hz, three-phase, 200 VL-L to 28 VDC, how would I go about doing that compared to a conventional 60 Hz equivalent. In other words, what design considerations need to be taken ...
- 59
-1
votes
1
answer
52
views
half controlable AC-DC converter
We are studying power electronics, AC-DC converters. Our teacher drawn a circuit with its graph like below:
Id: inductor or load current.
Vs: voltage of source.
Vd: voltage of load or inductor.
Iq: ...
- 67
0
votes
0
answers
90
views
Convert AC grid to DC and back to AC grid same phase
I would like to execute long time running transistor switch tests with high currents. I would like to source AC power from grid, convert it to DC, pass through my transistor switch, after that I want ...
- 101
1
vote
1
answer
47
views
61000-3-2 Pre-compliance harmonics
I am wondering about 61000-3-2 current harmonics pre-compliance test.
Say a company designs a single-phase [up to 13A] power converter for low-line 115V and high-line 230V and pass 61000-3-2 pre-...
- 125
0
votes
1
answer
77
views
Terminology of AC -DC converters
I would like to ask about the difference between the terms "AC-DC Converter", "DC-AC Converter" and "Inverter".
If I am getting it right, the "AC-DC converter" converters AC voltage to DC.
The "DC-...
- 143
0
votes
0
answers
91
views
How to ground external AC voltage (18V) to Arduino?
I have a project where I need to read 0-18 Volts AC in Arduino's input (0-5V DC).
So I did a circuit with a diode (half wave bridge), voltage divider, and a RC circuit where I tested some values for ...
- 567
0
votes
1
answer
113
views
About Ac to DC convertor..? [closed]
Which is the best way to convert Ac to DC , with maximum efficiency possible by using a transformer.
The required voltage is 5v and current is 1a .
I saw a circuit from my mobile phone charger they ...
