摘要:
Resistive battery feed circuits are normally not used because of lack of power supply noise rejection and attendant crosstalk coupling. In this circuit the opamp and surrounding circuitry insure that power supply and ground noise do not couple into the tip and ring circuits as a metallic signal and improve crosstalk attenuation. In addition, the opamp is used to split the 48 volt supply.
摘要:
L'invention concerne un circuit destiné à fournir deux tensions continues de polarités inversées, comprenant : deux condensateurs (C1, C2) dont les électrodes respectives sont reliées à deux bornes destinées à recevoir une tension alternative (2, 3) et dont les deuxièmes électrodes respectives sont connectées l'une à l'autre par deux premières diodes (D1, D2) en anti-série ; une source de courant commandable (M) dont une première borne est reliée aux anodes communes (A) desdites première diodes ; deux deuxièmes diodes (D7, D8) connectées en anti-série entre lesdites bornes destinées à recevoir ladite tension alternative et dont les cathodes communes (10) sont reliées à une deuxième borne de ladite source de courant commandable ; un circuit (9) de commande de ladite source de courant ; et deux troisièmes diodes (D10, D9) connectées en anti-série entre lesdites bornes destinées à recevoir ladite tension alternative, ledit circuit de commande prélevant son alimentation entre les cathodes communes des deuxièmes diodes et les anodes communes (11) des troisièmes.
摘要:
An electronic system (101/102) for use in a car has an electronic control unit (10) and, in the alternative, either a passive load (11) or an active logic (12) attached thereto. The control unit (10) comprises a push-pull arrangement (20) which can provide drive signals for the load (11) as well as for the logic (12), a multiplexer (45) to alternatively forward a load drive signal of a bus signal to the arrangement (20), and a register (90) to store a mode signal. Further, the control unit (10) automatically determines whether either the load (11) or the logic (12) is attached by analyzing electrical parameters.
摘要:
The aim of the invention is to discharge a first capacitor (CH) from a high voltage (VH) to a low voltage (VL). To this end, the one electrode of the first capacitor (CH) is linked with the one electrode of a second capacitor (CL) via a FET (P1) path. The other two electrodes of the two capacitors (CH, CL) are applied to a reference potential. A voltage source (UL) with its internal resistance (RL) is disposed in parallel to the second capacitor (CL). A discharge path leads from the one electrode of the first capacitor (CH) from the paths of two FET (P2, M1) and a protective resistor (R) to the reference potential. A current path leads from the one electrode of the second capacitor (CL) to the reference potential via the paths of two additional FET (P3, M2 or M3). A control unit (SE) switches on the discharge path. Once the voltage of the first capacity (CH) has decreased to the required lower value (VL), the discharge path is blocked while a holding path is opened.
摘要:
Resistive battery feed circuits are normally not used because of lack of power supply noise rejection and attendant crosstalk coupling. In this circuit the opamp (A1) and surrounding circuitry (Q1, Q2, Q10, C1, C2, 1R1, 1R2, R5) insure that power supply and ground noise do not couple into the tip and ring circuits (R1, T1, R2, T2) as a metallic signal and improve crosstalk attenuation. In additon, the opamp is used to split the 48 volts supply.
摘要:
L'invention concerne un circuit destiné à fournir deux tensions continues de polarités inversées, comprenant : deux condensateurs (C1, C2) dont les électrodes respectives sont reliées à deux bornes destinées à recevoir une tension alternative (2, 3) et dont les deuxièmes électrodes respectives sont connectées l'une à l'autre par deux premières diodes (D1, D2) en anti-série ; une source de courant commandable (M) dont une première borne est reliée aux anodes communes (A) desdites première diodes ; deux deuxièmes diodes (D7, D8) connectées en anti-série entre lesdites bornes destinées à recevoir ladite tension alternative et dont les cathodes communes (10) sont reliées à une deuxième borne de ladite source de courant commandable ; un circuit (9) de commande de ladite source de courant ; et deux troisièmes diodes (D10, D9) connectées en anti-série entre lesdites bornes destinées à recevoir ladite tension alternative, ledit circuit de commande prélevant son alimentation entre les cathodes communes des deuxièmes diodes et les anodes communes (11) des troisièmes.
摘要:
The aim of the invention is to discharge a first capacitor (CH) from a high voltage (VH) to a low voltage (VL). To this end, the one electrode of the first capacitor (CH) is linked with the one electrode of a second capacitor (CL) via a FET (P1) path. The other two electrodes of the two capacitors (CH, CL) are applied to a reference potential. A voltage source (UL) with its internal resistance (RL) is disposed in parallel to the second capacitor (CL). A discharge path leads from the one electrode of the first capacitor (CH) from the paths of two FET (P2, M1) and a protective resistor (R) to the reference potential. A current path leads from the one electrode of the second capacitor (CL) to the reference potential via the paths of two additional FET (P3, M2 or M3). A control unit (SE) switches on the discharge path. Once the voltage of the first capacity (CH) has decreased to the required lower value (VL), the discharge path is blocked while a holding path is opened.
摘要:
Resistive battery feed circuits are normally not used because of lack of power supply noise rejection and attendant crosstalk coupling. In this circuit the opamp (A1) and surrounding circuitry (Q1, Q2, Q10, C1, C2, 1R1, 1R2, R5) insure that power supply and ground noise do not couple into the tip and ring circuits (R1, T1, R2, T2) as a metallic signal and improve crosstalk attenuation. In additon, the opamp is used to split the 48 volts supply.