IT1262870B - Digital measurement process for alternating currents and voltages, and corresponding device - Google Patents
Digital measurement process for alternating currents and voltages, and corresponding deviceInfo
- Publication number
- IT1262870B IT1262870B ITUD930078A ITUD930078A IT1262870B IT 1262870 B IT1262870 B IT 1262870B IT UD930078 A ITUD930078 A IT UD930078A IT UD930078 A ITUD930078 A IT UD930078A IT 1262870 B IT1262870 B IT 1262870B
- Authority
- IT
- Italy
- Prior art keywords
- capacitor
- voltage
- line
- microprocessor
- measurement process
- Prior art date
Links
- 238000005259 measurement Methods 0.000 title abstract 5
- 238000000034 method Methods 0.000 title abstract 3
- 239000003990 capacitor Substances 0.000 abstract 9
- 230000003071 parasitic effect Effects 0.000 abstract 1
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
Digital measurement process for alternating currents and voltages, for measuring the mean value of the positive half-wave of the unknown alternating signal Vin, using at least one capacitor C connected in parallel with the line of the input voltage Vin, the voltage level of the said capacitor C being compared continuously with a known reference voltage Vb in a second operational amplifier OP2, the output of the said second operational amplifier OP2 being connected to the access line m of a microprocessor mP, the said line m being set to 1 when the voltage across the capacitor is greater than Vb and being set to 0 when the voltage across the capacitor is less than Vb, the microprocessor mP acting, in the first case, so that the capacitor C is discharged for a fixed period Toff = Tc and, in the second case, so that the capacitor C is charged for a fixed period Ton = Toff = Tc, the value of the unknown voltage Vin being determinable from the number of Ton and Toff periods respectively which are present during the measurement period T = nTc. Device for implementation of the above measurement process, comprising two input lines which can be connected alternatively to the measurement circuit, one of the said input lines being connected to the unknown voltage Vin and the other to a known reference voltage Vc used for compensation of the parasitic values of the components, a first operational amplifier OP1 which cuts the negative half-wave of the alternating signal, a capacitor C connected to the input line, a comparator OP2 for comparing the voltage of the capacitor C with a reference voltage Vb, and a microprocessor which is connected to the output of the said comparator OP2 and which maintains the said voltage level Vb across the capacitor C. <IMAGE>
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITUD930078A IT1262870B (en) | 1993-05-05 | 1993-05-05 | Digital measurement process for alternating currents and voltages, and corresponding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITUD930078A IT1262870B (en) | 1993-05-05 | 1993-05-05 | Digital measurement process for alternating currents and voltages, and corresponding device |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| ITUD930078A0 ITUD930078A0 (en) | 1993-05-05 |
| ITUD930078A1 ITUD930078A1 (en) | 1994-11-05 |
| IT1262870B true IT1262870B (en) | 1996-07-04 |
Family
ID=11421285
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ITUD930078A IT1262870B (en) | 1993-05-05 | 1993-05-05 | Digital measurement process for alternating currents and voltages, and corresponding device |
Country Status (1)
| Country | Link |
|---|---|
| IT (1) | IT1262870B (en) |
-
1993
- 1993-05-05 IT ITUD930078A patent/IT1262870B/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| ITUD930078A0 (en) | 1993-05-05 |
| ITUD930078A1 (en) | 1994-11-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 0001 | Granted | ||
| TA | Fee payment date (situation as of event date), data collected since 19931001 |
Effective date: 19970530 |