# US 9,882,559 B2 · Wireless proximity sensor with a target device comprising an inverter

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- Number: US 9,882,559 B2
- Document ID: US9882559B2
- Status: Granted
- Kind: B2
- Application number: 14/362,463
- Filed: 2012-12-12
- Published: 2014-11-20
- Granted: 2018-01-30
- Earliest claimed: 2011-12-16
- Assignees: Ray Perrier; Kawa Amin
- Applicants: Kawa Amin
- Inventors: Kawa Amin
- Web page: https://patentgrep.com/patent/US9882559B2

## CPC

- H03K 17/9537: {in a resonant circuit}
- G01S 13/758: {using a signal generator powered by the interrogation signal}
- G01S 13/767: {Responders; Transponders (teaching or practice apparatus for gun-aiming or gun-laying using reflecting targets or active targets F41G3/26)}
- H03K 17/954: {controlled by an oscillatory signal}
- H03K 2217/958: involving transponders
- 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)
- G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES

## Abstract

A target device for use with a switch device of a proximity switch has a wireless receiver means (6) for detecting and receiving a first pulsating signal (A) with a first carrier frequency (f1) from a nearby transmitter module (5), demodulating (6, 7) the received signal, and if a superimposed digital signal is present, inverting (9, 10, C4, and Q1) the superimposed received digital signal or, if the superimposed digital signal is absent, passing the existing energy through (10). The target device also has a wireless transmitter means (12) for modulating and sending the inverted pulse train if this exists by the second carrier frequency (f2) to the receiver switch unit (13). Additionally, the target comprises functionality to transmit the carrier frequency (f2) continuous and unmodulated where a continuous and unmodulated carrier frequency (f1) is present. However, upon existence of the pulsating signal only one of the receiver (6) and the transmitter (12) receives or transmits a signal at a given time.

## Claims

### Claim 1

A target device for use with a transceiver unit, the target device comprising:
a receiver for receiving a first pulsating signal from the transceiver unit;
a transmitter for transmitting a second pulsating signal to the transceiver unit; and
an inverter arranged to generate an inverted signal by inversion of the first pulsating signal;
wherein the transmitter is driven by the inverted signal, whereby only one of the receiver and the transmitter receives or sends a signal at a given time; and
wherein the target device is powered by electromagnetic radiation from the transceiver.

### Claim 2 (depends on 1)

A target device as in claim 1, wherein the first pulsating signal has a first carrier frequency and wherein the target device further comprises:
a demodulator arranged to convert the first pulsating signal into a baseband signal, and
wherein the inverter is arranged to generate the inverted signal by inversion of the baseband signal.

### Claim 3 (depends on 1)

A target device as in claim 1, wherein the inverter includes a capacitor arranged to be charged or discharged depending on a value of the first pulsating signal.

### Claim 4 (depends on 1)

A target device as in claim 1, wherein the first pulsating signal includes a pulse with a predetermined pulse width, and the target device further includes:
a processor unit having a predetermined code which processor unit is configured to detect a pulse in the inverted signal corresponding to said pulse with a predetermined pulse width, and to generate and add an encoded signal in the inverted signal during the detected pulse based on the predetermined code.

### Claim 5 (depends on 1)

A proximity sensor comprising:
a transceiver unit; and
a target device according to claim 1;
wherein the transceiver unit is arranged to transmit the first pulsating signal to the target device and to receive the second pulsating signal from the target device.

### Claim 6

A target device for use with a transceiver unit, the target device comprising:
a receiver for receiving a first pulsating signal from the transceiver unit;
a transmitter for transmitting a second pulsating signal to the transceiver unit; and
an inverter arranged to generate an inverted signal by inversion of the first pulsating signal;
wherein the transmitter is driven by the inverted signal;
wherein the target device stores received energy from the pulsating signal to power internal circuitry of the target device for communication with the transceiver unit; and
wherein only one of the receiver and the transmitter receives or sends a signal at a given time.