Input voltage

After the time-varying process has finished and the signal has become stabilized twelve-bit ADT connected with common line of SC EDC starts to work. And 5... 10 is later after start ADT gives digital code of input voltage, and this code is recorded into SC EDC memory. 

Iligh-voltage controllers which regulate prirnaiv input voltage to the rectifier and wiper transformer and house primary current-limiting protection, meters, and instrumentation are designed for local or remote operation. 

Input voltage H Q(aoin) The input voltage at which the product expects to ... 

HIq(Iow) operate for >99 percent of its life. The lowest anticipated operational input voltage... 

A defined period of time where the input voltage will exceed the Ki (hij specification that the unit must survive and during which it may need to operate. These are very high voltage spikes (-t/-) that are characteristic of the input power system. 

Line regulation Percentage change in the output voltage(s) in response to a change in the input voltage. 

This more effieient operation of the PWM switehing power supply is done by ehopping the direet eurrent (de) input voltage into pulses whose amplitude is... 

Its operation ean be seen as analogous to a meehanieal flywheel and a one-piston engine. The L-C Alter, like the flywheel, stores energy between the power pulses of the driver. The input to the L-C Alter choke input filter) is the ehopped input voltage. The L-C Alter volt-time averages this duty-cyele modulated input voltage waveform. The L-C Altering funetion ean be approximated by... 

The output voltage is maintained by the eontroller by varying the duty eyele. The buek eonverter is also known as a step-down converter, sinee its output must be less than the input voltage. 

The operation of the buek regulator ean be seen by breaking its operation into two periods (refer to Figure 3-2). When the switeh is turned on, the input voltage is presented to the input of the L-C Alter. The induetor eurrent ramps linearly upward and is deseribed as... 

As one can notice, the boost-mode converter has the same parts as the forward-mode converter, but they have been rearranged. This new arrangement causes the converter to operate in a completely different fashion than the forward-mode converter. This time, when the power switch is turned on, a current loop is created that only includes the inductor, the power switch, and the input voltage source. The diode is reverse-biased during this period. The inductor s current waveform (Figure 3-4) is also a positive linear ramp and is described by... 

How much input voltage appears across the primary winding of the transformer or inductor ... 

Solve for the highest input average input eurrent that oeeurs at the lowest speeified input voltage. This value allows the designer to determine the size of the wire used in the primary winding of the transformer or induetor. 

Output power Bipolar or unipolar flux Input voltage Number of windings Winding configuration... 

There are two main functions the forward-mode transformer performs the first is to provide a dielectric isolation barrier from the input to the output and the second is to step up or step down the pulsewidth modulated ac input voltage signal. The design flow becomes a step-by-step design procedure. 

This equation ean be solved for the needed seeondary turns at the lowest antieipated input voltage. At any input voltage lower than that, the regulator will fall out of regulation. 

This induetanee value should be eonsidered the maximum value sinee any higher value will eause the power supply to fall out of regulation above the minimum operational input voltage. 

This value of Apri represents the maximum value of primary induetanee that ean plaee the required energy in the eore within the time period available at the lowest expeeted input voltage. Any future modifieations to this number should be in the downward direetion. 

ToB(est) is the estimated on time of power switehes at the highest input voltage (30 pereent of l//op is a good guess). 

The dieleetrie isolation of the transformer should be at least able to withstand twiee the input voltage. Although this transformer is not tested during the HIPOT test, failure of its insulation would eause a eatastrophie failure in the eontrol eireuitry in the event of a power switeh failure. 

For dc input voltages that are more than 100 VDC, a layer of Mylar tape should be placed between primary and the secondary(ies) and between any multiple secondaries. One should not completely trust the insulation breakdown voltage rating of the magnet wire since it could nick during the winding process. 

---