# US 5,345,166 A · Regulated voltage two-wire detector > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,345,166 A - Document ID: US5345166A - Status: Granted - Kind: A - Application number: 07/861,853 - Filed: 1992-06-18 - Granted: 1994-09-06 - Earliest claimed: 1990-10-18 - Assignees: Telemecanioue - Inventors: Didier Leonard; Pierre Charrier - Web page: https://patentgrep.com/patent/US5345166A ## CPC - G01D 21/00: Measuring or testing not otherwise provided for - H03K 17/951: {Measures for supplying operating voltage to the detector circuit} - G01D: MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR - H03K: PULSE TECHNIQUE (measuring pulse characteristics G01R; modulating sinusoidal oscillations with pulses H03C; transmission of digital information H04L; discriminator circuits detecting phase difference between two signals by counting or integrating cycles of oscillation H03D3/04; automatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M) ## 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. ## Claims ### Claim 1 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. ### Claim 2 (depends on 1) The detector according to claim 1, wherein the first amplifier-switch providing the parallel type regulator function has a control terminal controlled by the output of a differential amplifier comparing part of the regulated voltage supplied to the processor circuit with a reference voltage. ### Claim 3 (depends on 1) The detector according to claim 1, wherein the second amplifier-switch providing the series type regulator function is an insulated gate transistor. ### Claim 4 (depends on 1) The detector according to claim 1, wherein at least one resistor is included in the switching branch to contribute with the amplifier-switches and their control means to limiting overcurrents in the switching branch. ### Claim 5 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. ### Claim 6 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.