Cén fáth é Anailís Foinse?
Foinse Athchóirithe
Is é foinse athchóirithe an t-ionsáid foinse leictreach áirithe agus a chur in ionad leis an n-aonach éifeachtach. Is féidir foinse voltáil phíoblach a athchóiriú go foinse curnaí phíoblach, agus vice versa.
Foinse Voltáil Phóiblí
Cuirtear foinse voltáil phóiblí i bhfeidhm trí foinse voltáil idéalach i síol le tiomáint isteach (nó impiodántas, do chuid circeacha AC). Do foinse voltáil idéalach, is é seo an impiodántais isteach nialas, rud a léiríonn nach maireann an voltás amharclainne beag bídeach ar a laghad ón ilsiú carraigthe. I measc na sainmple, ceiltí, bataí, agus gineadóirí.
Foinse Curnaí Phóiblí
Cuirtear foinse curnaí phóiblí i bhfeidhm trí foinse curnaí idéalach i paralail le tiomáint isteach (nó impiodántas). Do foinse curnaí idéalach, is é seo an impiodántais paralail neamhghnách, rud a chinntíonn nach maireann an curna amharclainne beag bídeach ar a laghad ón voltás carraigthe. Tá comhdhíolaí leictreona cosúil le transistóirí go minic modáilte mar fhoinsí curnaí. Tugtar teideal foinse curnaí díreach nó oltóir freisin ar fhoinsí voltáil díreach nó oltóir, de réir ábhair.
Mutual Transformability
Tá foinsí voltáil agus curnaí in ann athchóirithe a dhéanamh trí foinse athchóirithe. Chun a léiriú, feach ar an gciorcuit thíos:
Léiríonn an Fíoghrá A foinse voltáil phóiblí i síol le tiomáint isteach rv, agus léiríonn an Fíoghrá B foinse curnaí phóiblí le tiomáint isteach paralail ri.
Do foinse voltáil phóiblí, tá an curna carraigthe le feiceáil sa chothromóid:
Áit,
iLv is the load current for the practical voltage source
V is the voltage
rv is the internal resistance of the voltage source
rL is the load resistance
Tá sé aontaithe go bhfuil tiomáint carraigthe rL ceangailte thart ar an teiripe x-y. De mhaith leis, do foinse curnaí phóiblí, tá an curna carraigthe le feiceáil sa chothromóid:
iLi is the load current for the practical current source
I is the current
ri is the internal resistance of the current source
rL is the load resistance connected across the terminal x-y in the figure B
Become identical, when we will equate equation (1) and equation (2)
However, for the current source, when the terminals x-y are open (no load connected), the terminal voltage at x-y is V = I ×ri. Therefore, we obtain:
Therefore, for any practical voltage source with an ideal voltage V and internal resistance rv, the voltage source can be replaced by a current source I with the internal resistance connected in parallel with the current source.
Source Transformation: Conversion of Voltage Source into Current Source
When a voltage source is in series with a resistance and needs to be converted into a current source, the resistance is connected in parallel with the current source, as illustrated in the figure above. Here, the current source value is given by:R
In the circuit diagram above, a current source connected in parallel with a resistance can be transformed into a voltage source by placing the resistance in series with the voltage source. Here, the voltage source value is given by:Vs = Is × R
