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The effective output voltage from a power supply that uses a full-wave bridge rectifier is somewhat less than the peak transformer output voltage, as shown in Fig 21-2B The peak voltage across the diodes in the reverse direction is about 14 times the applied rms ac voltage Therefore, each diode needs to have a PIV rating of at least 14 15, or 21, times the rms ac voltage that appears at the transformer secondary The bridge circuit does not require a center-tapped transformer secondary It uses the entire secondary winding on both halves of the wave cycle, so it makes even more efficient use of the transformer than the full-wave center-tap circuit The bridge is also easier on the diodes than half-wave or full-wave center-tap circuits

Now we can prepare to list the fetched colors by displaying a message Here are the fetched colors: in the target <div> element; we ll also start an unordered list with a <ul> HTML tag so the colors appear in a bulleted list:

function getData(dataSource, divID) { if(XMLHttpRequestObject) { XMLHttpRequestObjectopen("GET", dataSource); var obj = documentgetElementById(divID); XMLHttpRequestObjectonreadystatechange = function()

Diodes and capacitors can be interconnected to deliver a dc output that is approximately twice the positive or negative peak ac input voltage This is called a voltage-doubler power supply This circuit works well only when the load draws low current Otherwise, the voltage regulation is poor; the voltage drops a lot when the current demand is significant The best way to build a high-voltage power supply is to use a step-up transformer, not a voltagedoubling scheme Nevertheless, a voltage-doubler power supply can be, and sometimes is, used when the cost of the circuit must be minimized and the demands placed on it are expected to be modest Figure 21-3 is a simplified diagram of a voltage-doubler power supply It works on the entire ac cycle, so it is called a full-wave voltage doubler This circuit subjects the diodes to voltage peaks in the reverse direction that are 28 times the applied rms ac voltage Therefore, the diodes should be rated for PIV of at least 42 times the rms ac voltage that appears across the transformer secondary When the current drawn is low, the dc output voltage of this type of power supply is approximately 28 times the rms ac input voltage Proper operation of a voltage-doubler power supply depends on the ability of the capacitors to hold a charge under maximum load The capacitors must have large values, as well as be capable of handling high voltages The capacitors serve two purposes: to boost the voltage and to filter the out-

3:

put The resistors, which have low ohmic values and are connected in series with the diodes, protect the diodes against surge currents that occur when the power supply is first switched on

if (XMLHttpRequestObjectreadyState == 4 && XMLHttpRequestObjectstatus == 200) { var xmlDocument = XMLHttpRequestObjectresponseXML; colors = xmlDocumentgetElementsByTagName("color"); objinnerHTML = "Here are the fetched colors:<ul>"; } } } }

Most dc-powered devices need something better more pure than the rough, pulsating dc that comes right out of a rectifier circuit The pulsations (ripple) in the rectifier output can be eliminated by a filter

Now we can loop over the colors array to extract the three colors:

function getData(dataSource, divID) { if(XMLHttpRequestObject) { XMLHttpRequestObjectopen("GET", dataSource); var obj = documentgetElementById(divID); XMLHttpRequestObjectonreadystatechange = function() { if (XMLHttpRequestObjectreadyState == 4 && XMLHttpRequestObjectstatus == 200) { var xmlDocument = XMLHttpRequestObjectresponseXML; colors = xmlDocumentgetElementsByTagName("color"); objinnerHTML = "Here are the fetched colors:<ul>"; for (loopIndex =0; loopIndex < colorslength; loopIndex++) { } } } } }