Questions tagged [reverse-polarity]

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2
votes
1answer
268 views

Controlling direction of current flow through pin depending on the type of device connected

I have a small portable device - lets call it MASTER - which can be inserted into two different accessories - CHARGER and SLAVE. You can check very rough block diagrams in the attached picture. ...
13
votes
2answers
3k views

Do serially connected diodes share equal reverse voltage?

If I place three cheap 200 V rated diodes across a 500 V supply instead of one expensive diode, is the system guarantied to work correctly? My worry is the situation at which two of the diodes share ...
0
votes
1answer
2k views

Input protection circuit with P MOSFETs and SPDT for ON-OFF switch

I am making a circuit which may draw up to 3-4 Amps, so I am avoiding using a Schottky diode as fool-proofing it from incorrect polarity on the battery (12V, automotive style) input. I have used P ...
1
vote
2answers
21k views

limit switches to control motor direction

I am trying to use two limit switches and two DPDT relays to control the direction of the motor. When the power is applied the motor should rotate one direction (direction for this question isn't ...
29
votes
3answers
18k views

How does USB Type C handle reverse polarity

The new USB Type C connector doesn't have a physical reverse polarity protection anymore. You can plug it in any way you want on both ends, there is also no A and B end anymore, it's all the same. So ...
1
vote
2answers
589 views

Battery Polarity

I was bored at work, and remember when i was little, putting batteries in the wrong way would stop the object from functioning, then decided to try reversing the polarity of the batteries in my torch, ...
0
votes
1answer
370 views

How to measure the negative voltage on the ADC with only positive voltage reference available?

I have a Phocos CA-08 controller where I wanted to measure a solar cell and a battery voltage with the MCU. The first thing I made was to connect grounds of CA-08 (solar and batt sockets) to MCU ...
5
votes
2answers
1k views

Why don't solar cells produce visible light when supplied with electricity?

... A cursory Google search didn't reveal an answer... Is the energy conversion a one-way process?
4
votes
1answer
3k views

Are Supercapacitors Polarized

There seems to be conflicting information on the internet. Are super capacitors polarized? For instance, could you charge them and then suddenly invert their polarity (à la charge pump)?
1
vote
3answers
7k views

Rapidly reverse polarity of electromagnet

Please forgive my zero knowledge of electronics. I have asked my people what I thought was a simple question but I just get bogged down with endless questions which I can't answer. Expressing the ...
4
votes
3answers
13k views

Reverse Voltage Protection with a P-channel MOSFET [duplicate]

I'm looking to use the P-channel MOSFET approach to reverse polarity protection as described here and here (fig 5). Basically this picture: I've seen that circuit topology used, for example, here, ...