Analog input device
AssigneeMitsubishi Electric Corporation
InventorsSeiichi Saito, Yoshihiro Akeboshi
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Abstract
An amplifier for amplifying a pulse-like signal output from a secondary side of an isolating transformer, a capacitor connected to a negative feedback loop across the input and output of the amplifier, and a timing control circuit for controlling an FET into a closed state, then controlling a switch into a closed state, and after that controlling the switch into an open state at timing simultaneously with the FET or earlier than the FET are provided, and when the switch is controlled into the open state, an AD converter converts the output signal of the amplifier to a digital signal.
Claims12
An analog input device comprising:
- isolating transformers each for outputting, while a primary side switch is controlled in a closed state and an analog signal is applied to a primary side, a pulse-like signal with amplitude corresponding to the analog signal from a secondary side;
- secondary side switches connected to the secondary sides of the isolating transformers;
- an amplifier for amplifying the pulse-like signal output from the secondary side of one of the isolating transformers while one of the secondary side switches is controlled in a closed state;
- a capacitor connected to a negative feedback loop across an input and output of the amplifier;
- timing control means for controlling the primary side switch of one of the isolating transformers into the closed state, then for controlling the corresponding secondary side switch into the closed state, and for controlling after that the secondary side switch into an open state at timing simultaneous with the primary side switch or earlier than the primary side switch;
- and
- an AD converter for converting, after the timing control means controls the secondary side switch into the open state, an output signal of the amplifier to a digital signal.
An analog input device comprising:
- differential amplifiers each for amplifying an analog signal;
- selecting switches connected to output sides of the differential amplifiers;
- an amplifier for amplifying the analog signal amplified by one of the differential amplifiers while the corresponding selecting switch is controlled in a closed state;
- a capacitor connected to a negative feedback loop across an input and output of the amplifier;
- timing control means for controlling one of the selecting switches into the closed state, and after that controlling the selecting switch into an open state;
- and
- an AD converter for controlling, when the timing control means controls the selecting switch into the open state, an output signal of the amplifier to a digital signal.
Dependencies are inferred from the claim text.