Could you me what this transformer is doing in dc circuit?

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Discussion Overview

The discussion revolves around the functioning of a transformer in a DC circuit, specifically in the context of a thermoelectric generator and a related chip. Participants explore how a transformer can step up DC voltage and the role of associated components in the circuit.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant questions how a transformer can step up DC current, indicating a need for clarification on the operation.
  • Another participant explains that the transformer operates with an AC current generated by a switch in the primary circuit, which operates at a frequency of tens to hundreds of kHz.
  • There is mention of a "charge pump" in the circuit, which includes specific components that contribute to the overall function.
  • Several participants express interest in the chip's capabilities, noting that the output voltage is user programmable.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the initial question regarding the transformer and DC current, as the discussion includes varying levels of understanding and technical detail about the circuit's operation.

Contextual Notes

The discussion does not clarify the assumptions regarding the operation of transformers with DC and relies on specific circuit details that may not be universally applicable.

Who May Find This Useful

Readers interested in circuit design, transformer operation, and thermoelectric generators may find this discussion relevant.

amit016
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Thermoelectric generator induce DC current and I just wants to understand how can a transformer step up DC. If there is something else please make me clear.
 

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This chip is complicated, but the essence of your question is easily answered. The pin marked SW is a switch that closes the primary circuit to ground at the circuit's operating frequency, which is typically 10's of kHz to 100 kHz. This creates an AC current in the transformer primary that steps up in voltage to power the rest of the circuit. There is also a "charge pump" consisting of C1 and circuitry in the chip.
 
what a neat little chip
The datasheet makes a good read

Dave
 
davenn said:
what a neat little chip
The datasheet makes a good read

Dave
Indeed. You can get the datasheet from their LTC3108 product page.

What I like about it is the output is user programmable using VS1 and VS2 for:
2.35V, 3.3V, 4.1V, or 5V
 
thanks guys, for your time. I appreciate that.
 

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