EP3564980B1 - Two-wire tilt switch - Google Patents
Two-wire tilt switch Download PDFInfo
- Publication number
- EP3564980B1 EP3564980B1 EP18170467.7A EP18170467A EP3564980B1 EP 3564980 B1 EP3564980 B1 EP 3564980B1 EP 18170467 A EP18170467 A EP 18170467A EP 3564980 B1 EP3564980 B1 EP 3564980B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- switch
- per
- sensor element
- output
- supply
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000011156 evaluation Methods 0.000 claims description 15
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 8
- 229910052753 mercury Inorganic materials 0.000 description 8
- 238000013461 design Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004870 electrical engineering Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000002920 hazardous waste Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H35/00—Switches operated by change of a physical condition
- H01H35/02—Switches operated by change of position, inclination or orientation of the switch itself in relation to gravitational field
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/0036—Switches making use of microelectromechanical systems [MEMS]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H35/00—Switches operated by change of a physical condition
- H01H35/06—Switches operated by change of speed
Definitions
- the invention relates to a process and products as per the first portion of the independent claims.
- the term "mercury switch” is known an electrical switch that closes a circuit when a small amount of the liquid metal mercury connects metal electrodes.
- the mercury tilt switch represents the most common design of this control element. It remains in a defined state (open or closed) when tilted one direction with respect to horizontal and enters the other state when tilted the other direction.
- solutions based on liquid or pendulum elements are available, typically being evaluated inductively, capacitively, or optically.
- these devices as well are increasingly displaced by MEMS technology.
- US 5751074 A (EDWARD B PRIOR) 05.12.1998 discloses an electrical switch sensitive to an externally applied inertial and gravitational force, having an enclosure with a closed space; a conductive fluid filing a first portion of the space and a non- conductive medium filling a second portion of the space, the conductive fluid and the non-conductive medium having differing densities; at least two electrodes in communication with the space; an electrical circuit coupled the contacts and having electrical connections for connection with a power source and a load, having a semiconductor switching device, which is responsive to a current through the contacts, a current through the contacts causing the semiconductor switching device to change in conductivity.
- An externally applied force e.g., gravity or inertial force, causes the conductive fluid to move within the enclosure with respect to the contacts, altering a current through the contacts, and thereby changing a conducting state of the semiconductor switching device.
- the switch resides within a housing, containing both the enclosure and the electrical circuit.
- JP H09274842 A (R B CONTROLS KK) 21.10.1997 discloses an earth leakage breaker.
- An operation test switch is provided in the earth leakage breaker, and when the switch is manually turned on, a part of the current bypasses a leakage detecting unit through a resistor, and the condition the same as the case where a leakage is generated can be artificially generated.
- a leakage is intentionally generated, a relay is electrified, and a relay contact is turned off.
- An inclination switch is connected in parallel with the switch, and when the inclination switch is inclined at the predetermined angle or more and turned off, the condition that a leakage is generated in the same way as the condition that the switch is turned off is generated, and a relay contact is turned off to stop the power supply to an equipment.
- JP 2000146579 A (TOYO DENSO KK) 26.05.2000 discloses a time-constant circuit formed out of capacitors and a resistor in a detecting circuit and a constant current circuit in the collector of a controlling transistor.
- the detecting circuit formed to output a detected signal of high level when a Hall detects the rotational condition of a movement beyond a prescribed angle and comes into a switch-on state, is provided with a time constant circuit consisting of capacitors and a resistor therein.
- a constant current circuit is provided which supplies constant current to the collector of a controlling transistor.
- a breakdown diode is provided to serve as a constant current circuit. As a result, a battery power supply is changed into constant voltage, and collector current which is consistently constant is fed through the resistor in turning-on the transistor.
- the invention proposes a two-wire tilt switch based on electronics which, by design of a combined supply and output stage, is supplied in both the switch's open and closed states.
- the combined supply and output stage is constructed to produce a small voltage drop across the switch in its closed state and a low leakage current through the switch in its open state. This ensures that the switch electronics continues to be supplied in both switching states.
- a MEMS acceleration sensor with analog output signal may be used within the scope of the invention.
- the currents and voltages required for the operation and signal evaluation of such MEMS sensor are very low and can thus be supplied by a combined supply and output stage as outlined above.
- the switching point of a tilt switch based on a MEMS sensor may be easily adjusted by suitable analog or digital signal processing of the sensor output signal.
- a switch as per the invention requires only two terminals and may serve to retrofit any device depending on mercury switches.
- the two-wire tilt switch 1 is essentially composed of a combined supply and output stage 2, a sensor element 3, and an evaluation logic 4.
- the supply and output stage 2 is designed to, in the open state of the switch, exhibit high resistance between the supply pin 5 and the switching output 6 while still permitting a low residual current - typically below 1 mA - for internal supply of the sensor element 7 and evaluation logic 8.
- the supply and output stage 2 exhibits low resistance between the supply pin 5 and the switching output 6 while sustaining low residual voltage - typically about 3 V - to power internal supplies 7 and 8 of the sensor element 3 and evaluation logic 4, respectively.
- the sensor element 3 is an analog MEMS sensor with low current consumption - typically below 500 ⁇ A - that provides an analog output signal 9 to the evaluation logic 4.
- the voltage of the output signal 9 corresponds to the inclination angle of the MEMS sensor with respect to the horizontal plane.
- the evaluation logic 4 is configured such that it sets or resets, respectively, the output signal 10 of the evaluation logic 4 depending on the output signal 9 of the sensor element 3.
- the evaluation logic 4 is further capable of evaluating and logically connecting two switching levels. For instance, output signal 10 may be set while output signal 9 is within a first interval, reset while it is within a second, intermediate interval, and set again while it is within a third interval. In a preferred embodiment, such design is employed to implement an axisymmetric switching behavior of the tilt switch.
- the output signal 10 of the evaluation logic 4 toggles the state of the combined output and supply stage 2 between the switch's open state (high resistance) and closed state (low resistance).
- the supply pin 5 is connected to a positive supply voltage (traditionally referred to as "voltage at the common collector", Vcc) while the switching output 6 connects to an attached load 11.
- Vcc positive supply voltage
- the second terminal of the connected load 11 is connected to ground (GND) 12.
- the invention is applicable, inter alia, throughout the electronics industry.
Description
- The invention relates to a process and products as per the first portion of the independent claims.
- In the art of electrical engineering, by the term "mercury switch" is known an electrical switch that closes a circuit when a small amount of the liquid metal mercury connects metal electrodes. The mercury tilt switch represents the most common design of this control element. It remains in a defined state (open or closed) when tilted one direction with respect to horizontal and enters the other state when tilted the other direction.
- Since mercury is a poisonous heavy metal, devices containing such switches must be treated as hazardous waste for disposal. In many jurisdictions, mercury is now a restricted substance, and most modern applications have eliminated it. A metal ball and contact wires can directly replace it but may require additional circuitry to eliminate switch bounce. This method of action is further elucidated in FRADEN, Jacob. Handbook of Modern Sensors - Physics, Designs and Applications. 5th edition. Cham Heidelberg New York Dordrecht London: Springer, 2016. ISBN 3319193023.
- In recent years, the industry has developed a broad portfolio of tilt switches and sensors. Owing to the widespread availability of sensor elements based on MEMS technology, numerous solutions have flooded the market. State-of-the-art tilt sensors measure inclination at a precision of approximately 0.01 degrees and offer programmable switching points and various analog and digital interfaces.
- Furthermore, solutions based on liquid or pendulum elements are available, typically being evaluated inductively, capacitively, or optically. However, these devices as well are increasingly displaced by MEMS technology.
-
US 5751074 A (EDWARD B PRIOR) 05.12.1998 discloses an electrical switch sensitive to an externally applied inertial and gravitational force, having an enclosure with a closed space; a conductive fluid filing a first portion of the space and a non- conductive medium filling a second portion of the space, the conductive fluid and the non-conductive medium having differing densities; at least two electrodes in communication with the space; an electrical circuit coupled the contacts and having electrical connections for connection with a power source and a load, having a semiconductor switching device, which is responsive to a current through the contacts, a current through the contacts causing the semiconductor switching device to change in conductivity. An externally applied force, e.g., gravity or inertial force, causes the conductive fluid to move within the enclosure with respect to the contacts, altering a current through the contacts, and thereby changing a conducting state of the semiconductor switching device. The switch resides within a housing, containing both the enclosure and the electrical circuit. -
JP H09274842 A -
JP 2000146579 A - The invention as claimed is hereinafter disclosed in such a way that the technical problem with which it deals can be appreciated and the solution can be understood.
- The described solutions as per the prior art bears two significant downsides compared to the mercury switch: Due to the use of a sensor element that must be evaluated electronically, a power supply and at least one switching output are needed which, when procured at a level of robustness and reliability comparable to that of a mercury switch, are considerably more expensive. For existing applications requiring a one-to-one replacement of legacy switches, this often represents a major technical and pricing problem.
- The invention proposes a two-wire tilt switch based on electronics which, by design of a combined supply and output stage, is supplied in both the switch's open and closed states.
- The combined supply and output stage is constructed to produce a small voltage drop across the switch in its closed state and a low leakage current through the switch in its open state. This ensures that the switch electronics continues to be supplied in both switching states.
- In most use cases, these characteristics prove unproblematic, since for applications such as PLC inputs, switching relays, or simple consumers, such behavior lies well within the tolerated range. Switching arrangements of this type are known, for example, in the field of inductive proximity switches and considered customary for both AC and DC switches.
- As a sensor element, a MEMS acceleration sensor with analog output signal may be used within the scope of the invention. The currents and voltages required for the operation and signal evaluation of such MEMS sensor are very low and can thus be supplied by a combined supply and output stage as outlined above. Further, the switching point of a tilt switch based on a MEMS sensor may be easily adjusted by suitable analog or digital signal processing of the sensor output signal.
- A switch as per the invention requires only two terminals and may serve to retrofit any device depending on mercury switches.
-
-
Figure 1 shows the structural features of the two-wire tilt switch. -
Figure 2 illustrates a typical application of the two-wire tilt switch. - The two-
wire tilt switch 1 is essentially composed of a combined supply andoutput stage 2, asensor element 3, and anevaluation logic 4. - The supply and
output stage 2 is designed to, in the open state of the switch, exhibit high resistance between thesupply pin 5 and theswitching output 6 while still permitting a low residual current - typically below 1 mA - for internal supply of thesensor element 7 andevaluation logic 8. - In the closed state of the switch, the supply and
output stage 2 exhibits low resistance between thesupply pin 5 and theswitching output 6 while sustaining low residual voltage - typically about 3 V - to powerinternal supplies sensor element 3 andevaluation logic 4, respectively. - In the present embodiment, the
sensor element 3 is an analog MEMS sensor with low current consumption - typically below 500 µA - that provides ananalog output signal 9 to theevaluation logic 4. The voltage of theoutput signal 9 corresponds to the inclination angle of the MEMS sensor with respect to the horizontal plane. - The
evaluation logic 4 is configured such that it sets or resets, respectively, theoutput signal 10 of theevaluation logic 4 depending on theoutput signal 9 of thesensor element 3. Theevaluation logic 4 is further capable of evaluating and logically connecting two switching levels. For instance,output signal 10 may be set whileoutput signal 9 is within a first interval, reset while it is within a second, intermediate interval, and set again while it is within a third interval. In a preferred embodiment, such design is employed to implement an axisymmetric switching behavior of the tilt switch. - The
output signal 10 of theevaluation logic 4 toggles the state of the combined output andsupply stage 2 between the switch's open state (high resistance) and closed state (low resistance). - In
Figure 2 , thesupply pin 5 is connected to a positive supply voltage (traditionally referred to as "voltage at the common collector", Vcc) while theswitching output 6 connects to an attachedload 11. The second terminal of the connectedload 11 is connected to ground (GND) 12. - The invention is applicable, inter alia, throughout the electronics industry.
- The following reference key lists each reference sign along with the designation of the feature which it indicates.
-
- 1
- Two-wire tilt switch
- 2
- Combined supply and output stage
- 3
- Sensor element
- 4
- Evaluation logic
- 5
- Supply pin (Vcc)
- 6
- Switching output
- 7
- Internal supply of sensor element
- 8
- Internal supply of evaluation logic
- 9
- Output signal of sensor element
- 10
- Output signal of evaluation logic
- 11
- Attached load
- 12
- Ground (GND)
- The following literature is cited throughout this document.
-
-
US 5751074 A (EDWARD B PRIOR ) 05.12.1998 -
JP H09274842 A -
JP 2000146579 A - FRADEN, Jacob. Handbook of Modern Sensors - Physics, Designs and Applications. 5th edition. Cham Heidelberg New York Dordrecht London: Springer, 2016. ISBN 3319193023.
Claims (12)
- A tilt switch (1)
having an open state and a closed state and
comprising an electronics assembly (3, 4), and
a combined supply and output stage (2) configured such that the assembly (3, 4) is supplied in both states, characterized in that the supply and output stage (2) has a supply pin (5) and a switching output (6) and is adapted to offer high resistance in the open state while allowing residual current to pass between the supply pin (5) and the switching output (6) and low resistance in the closed state while allowing residual voltage to drop between the supply pin (5) and the switching output (6). - Switch (1) as per Claim 1,
characterized in that
the assembly (3, 4) comprises a sensor element (3) and an evaluation logic (4). - Switch (1) as per Claim 2,
characterized in that
the residual current amounts to less than 1 mA. - Switch (1) as per Claim 2,
characterized in that
the residual voltage approximates 3 V. - Switch (1) as per any of Claim 2 through Claim 4,
characterized in that
the sensor element (3) is microelectromechanical. - Switch (1) as per any of Claim 2 through Claim 5,
characterized in that
the sensor element (3) exhibits current consumption below 500 µA. - Switch (1) as per any of Claim 2 through Claim 6,
characterized in that
the sensor element (3) is adapted to output an analog signal (9). - Switch (1) as per Claim 7,
characterized in that
the analog signal (9) is a voltage signal. - Switch (1) as per Claim 7 or Claim 8,
characterized in that
the sensor element (3) is configured such that when the sensor element (3) is supplied with power, the analog signal (9) of the sensor indicates an inclination angle of the sensor element (3) with respect to a horizontal plane. - Switch (1) as per Claim 7, Claim 8, or Claim 9,
characterized in that
the evaluation logic (4) is adapted to output a digital signal (10) depending on the analog signal (9). - Switch (1) as per Claim 10,
characterized in that
the evaluation logic (4) is configured such that when the sensor element (3) is supplied, the digital signal (10) is set only if the analog signal (9) falls within a predetermined range. - Switch (1) as per any of the preceding claims,
characterized in that
the combined supply and output stage (2) is adapted to toggle the switch (1) between the open state and the closed state depending on the digital signal (10).
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP18170467.7A EP3564980B1 (en) | 2018-05-02 | 2018-05-02 | Two-wire tilt switch |
PCT/EP2019/060484 WO2019211137A1 (en) | 2018-05-02 | 2019-04-24 | Two-wire tilt switch |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP18170467.7A EP3564980B1 (en) | 2018-05-02 | 2018-05-02 | Two-wire tilt switch |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3564980A1 EP3564980A1 (en) | 2019-11-06 |
EP3564980B1 true EP3564980B1 (en) | 2021-08-11 |
Family
ID=62116244
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18170467.7A Active EP3564980B1 (en) | 2018-05-02 | 2018-05-02 | Two-wire tilt switch |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP3564980B1 (en) |
WO (1) | WO2019211137A1 (en) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5751074A (en) | 1995-09-08 | 1998-05-12 | Edward B. Prior & Associates | Non-metallic liquid tilt switch and circuitry |
JPH09274842A (en) | 1996-04-02 | 1997-10-21 | R B Controls Kk | Earth leakage breaker with overturn detecting function |
JP3180088B2 (en) * | 1998-09-25 | 2001-06-25 | 株式会社豊田自動織機製作所 | Industrial vehicle hydraulic control device and forklift |
JP2000146579A (en) | 1998-11-05 | 2000-05-26 | Toyo Denso Co Ltd | Tilt sensor |
US8144445B2 (en) * | 2007-06-12 | 2012-03-27 | General Electric Company | Micro-electromechanical system based switching |
US20120325629A1 (en) * | 2011-06-22 | 2012-12-27 | Xiao-Feng Li | Tilt Switch |
-
2018
- 2018-05-02 EP EP18170467.7A patent/EP3564980B1/en active Active
-
2019
- 2019-04-24 WO PCT/EP2019/060484 patent/WO2019211137A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
None * |
Also Published As
Publication number | Publication date |
---|---|
WO2019211137A1 (en) | 2019-11-07 |
EP3564980A1 (en) | 2019-11-06 |
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