{"id":171,"date":"2022-09-24T10:29:58","date_gmt":"2022-09-24T01:29:58","guid":{"rendered":"https:\/\/www.ssil.co.jp\/product\/EMSolution\/en2\/?post_type=case&p=171"},"modified":"2022-09-25T00:21:59","modified_gmt":"2022-09-24T15:21:59","slug":"var_resistor","status":"publish","type":"case","link":"https:\/\/www.ssil.co.jp\/product\/EMSolution\/en\/case\/var_resistor\/","title":{"rendered":"Time-dependent variable resistance elements"},"content":{"rendered":"

Summary<\/h3>\n

A time-dependent variable resistance element (VR) has been added to NETWORK. An example analysis is shown in Fig. 1 for the model described in "Improvement of Power Supply Input Method"<\/font><\/a>\uff08 with the addition of the variable resistor element. <\/p>\n

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\n \"\"<\/a>
\n<\/p>\n

Fig.1 Analysis model<\/p>\n<\/div>\n

Explanation<\/h3>\n

The circuit represented in Fig. 1 is represented by the data in Table 1. Table 2 shows the input format for the time-dependent variable resistance element (VR). While a constant resistance value ($\\Omega$) is entered for the resistance element ($R$), for the variable resistance element, the time variation of the resistance value is specified by a time variation identification number (TIME_ID). A variable resistance element ($VR$) can be given a step change in resistance as shown in Table 3. In this example, the resistance is zero from time 0 to 0.1 second, and 1 $k \\Omega$ from 0.1 to 0.2 seconds. (This data is equivalent to the data for the switch used in the "Improvement of Power Supply Input Method"<\/font><\/a>.) Of course, a continuous resistance change can also be analyzed. The analysis results of this example are shown in Fig. 2 and are in good agreement with the analysis values calculated from the resistance and inductance of the coil. <\/p>\n

Table 1. NETWORK Data<\/strong> <\/p>\n

* NETWORK * REGION_FACTOR *<\/span>
\n NETWORK 8<\/span>
\n* FEM * ID * NODE1 * NODE2 * SERIED_ID *<\/span>
\n FEM 1 1 2 \u3000\u3000 1<\/span>
\n* R * ID * NODE1 * NODE2 * RESISTANCE *<\/span>
\n R 2 2 3 5.0<\/span>
\n* VPS * ID * NODE1 * NODE2 * TIME_ID *<\/span>
\n VPS 3 \u3000 3 4 1<\/span>
\n* VR * ID * NODE1 * NODE2 * TIME_ID *<\/span>
\n VR 5 \u3000 4 1 2<\/span><\/font>
\n* END NETWORK *<\/span>
\n END<\/span>\n<\/p>\n

Table 2. Variable Resistance Element Input Form<\/h2>\n\n\n\n\n\t\n\n\t\n\t\n\t\n\t\n\t\n\t
17.8.15 Variable resistance elements<\/th>\n<\/tr>\n<\/thead>\n
row<\/td>string<\/td>Name<\/td>Type<\/td>Content<\/td>\n<\/tr>\n
1<\/td>1<\/td>VR<\/td>S<\/td>Title

\nRepresents time-dependent variable resistance.
\n<\/td>\n<\/tr>\n
2<\/td>ID<\/td>I<\/td>element identification number<\/td>\n<\/tr>\n
3<\/td>START<\/td>I<\/td>starting node number<\/td>\n<\/tr>\n
4<\/td>END<\/td>I<\/td>endpoint node number<\/td>\n<\/tr>\n
5<\/td>TIME_ID<\/td>I<\/td>Time-varying identification number (18).

\nResistance ($\\Omega$) as a function of time.

\n The time variation may be varied stepwise.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\nS: String type , I: Integer type<\/p>\n

Table 3. Example of resistance time variation data for variable resistance elements<\/strong> <\/p>\n

* TIME_ID * OPTION *<\/span>
\n 2 1<\/span>
\n* NO_TIME_POINTS *<\/span>
\n 4<\/span>
\n* Time(sec) * Value *<\/span>
\n 0.0 0<\/span>
\n 0.1 0<\/span>
\n 0.1 1.0e3<\/span>
\n 0.2 1.0e3<\/span>\n<\/p>\n

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\n \"\"<\/a>
\n<\/p>\n

Fig.2 Circuit current time variation<\/p>\n<\/div>\n

<\/p>\n

Download<\/h3>\n

Analysis Model<\/h4>\n