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US 5,345,166 AGranted
Regulated voltage two-wire detector
AssigneeTelemecanioue
InventorsDidier Leonard, Pierre Charrier
Life of this patent
Estimating the term…
Abstract
Detector comprising a sensor and a processing circuit connected to a load by means of two wires. Two switches (I1, I2) are arranged in series in a switching circuit leg (21), the ends of which (C, D) are connected to the detector terminals and the middle point (S) to a terminal (F) of the processing circuit. When operating (I1) is conductive and (I2) determines a parallel regulation of the voltage (V) at the processing circuit (12) terminals ; when in rest position, (I1) determines a series regulation of the voltage while (I2) is blocked.
Claims6
A regulated voltage two-wire detector comprising:
- a load circuit comprising a load in series with a voltage source and two terminals;
- a voltage regulator and switching device comprising a first and a second variable gain amplifier-switch connected in series in a switching branch having a junction point and two ends which are respectively connected to the two terminals of the load circuit, said first amplifier-switch having a first state in which it is turned off and a second state in which it provides a parallel type voltage regulation, and said second amplifier-switch having a first state in which it is turned on and a second state in which it provides a series type voltage regulation;
- a sensor associated with an electronic processor circuit having two terminals respectively connected to one of said two ends and to said junction point of said switching branch, and supplied with a regulated voltage by said voltage regulator and switching device, said electronic processor circuit controlling said first and second variable gain amplifier-switches so that:
- when the sensor is in a first state said first amplifier-switch is in its second state and said second amplifier-switch is in its first state, and
- when said sensor is in a second state said first amplifier-switch is in its first state and said second amplifier-switch is in its second state;
- and
- means for keeping said second amplifier-switch in its second state when said sensor is in its first state.
4 more elements
A regulated voltage two-wire detector comprising:
- a load circuit comprising a load in series with a voltage source and two terminals;
- a voltage regulator and switching device comprising a variable gain amplifier-switch and an insulated gate transistor connected in series in a switching branch having a junction point and two ends which are respectively connected to the two terminals of the load circuit, said amplifier-switch having a first state in which it is turned off and a second state in which it provides a parallel type voltage regulation, and said transistor having a first state in which it is turned on and a second state in which it provides a series type voltage regulation;
- a sensor associated with an electronic processor circuit having two terminals respectively connected to one of said two ends and to said junction point of said switching branch, and supplied with a regulated voltage by said load circuit through said voltage regulator and switching device, said electronic processor circuit controlling said variable gain amplifier-switches so that:
- when the sensor is in a first state said amplifier-switch is in its second state and said transistor is in its first state, and
- when said sensor is in a second state said amplifier-switch is in its first state and said transistor is in its second state;
- a voltage multiplier circuit connected to a gate of said transistor, which keeps said transistor saturated in said first state;
- and
- a voltage threshold network connected to the gate of said transistor, which regulates voltage applied to said gate in said first state.
5 more elements
A regulated voltage two-wire detector comprising:
- a load circuit comprising a load in series with a voltage source and two terminals;
- a switching and parallel type voltage regulator element and a switching and series type regulator voltage element which comprises a thyristor having an anode and a gate, and an insulated gate transistor connected between said anode and said gate, said thyristor being connected in series with said switching and parallel type voltage regulator element in a switching branch having two ends which are respectively connected to the two terminals of the load circuit, said transistor having a gate which is connected to a voltage threshold network;
- and
- a sensor associated with an electronic processor circuit having two terminals respectively connected to one of said two ends and to the gate of said thyristor, and supplied with a regulated voltage by said load circuit through said switching and voltage regulator elements, said electronic processor circuit controlling said switching and voltage regulator elements so that:
- when said sensor is in a first state, said thyristor and said switching and parallel type voltage regulator element are turned on and said transistor is turned off, and
- when said sensor is in a second state, said transistor providing a series type regulator function is turned on and said thyristor and said switching and parallel type voltage regulator element are turned off.
3 more elements
Dependencies are inferred from the claim text.