EP0289136A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Electronic data communications system
Assignee: ELECTO-GALIL Ltd
•
Filing: 1988-03-25
•
Granted: —
•
Expires: 2008-03-25
Abstract
Abstract A data transmission system for the non-contact transmission of data between a station (1) and a portable data card (2), both of which contain resonant circuits (5, 11) tuned to the same frequency. The data card (2) receives power from the station (1) via inductive coupling of the two resonant circuits and transmits data to the station by means of a loading circuit (14) on the card which loads the card resonant circuit and hence, by mutual coupling, the station resonant circuit in response to data stored within the card. The card also contains a reading circuit (17) containing a pulse generation circuit which generates a pulse whenever the power received by the card resonant circuit is interrupted and then restored. Data may thus be transmitted from the station to the card by deactuating the station resonant circuit in response to the data to be transmitted, the resulting pulses generated within the card being interpreted as the transmitted data.
Inventors
- 👤 Ronnie Gilboa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 08:33
CPC Classifications
G; G06; G06K; G06K7/00; G06K7/0008
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
272 words
A data transmission system for the non-contact transmission of data between a station (1) and a portable data card (2), wherein the station (1) includes: a station resonant circuit (5) tuned to a first signal, and a demodulator (4) for detecting a second signal superimposed on the first signal, and wherein the portable data transaction card (2) includes: a card resonant circuit (11) responsive to the station resonant circuit (5) for inductive coupling therewith so as to receive power from the station (1), and a card data communications circuit (18) designed to be powered by said received power for loading the card resonant circuit thereby modulating the first signal with the second signal in response to first data stored within the card data communications circuit (18) and, by means of said inductive coupling, enabling the first data to be transmitted from the card (2) to the station (1); characterized in that there is further provided: a station data communications circuit (7) within the station (1) for deactuating the station resonant circuit (5) end, by means of said inductive coupling, for deactuating the card resonant circuit (11) in response to second data stored in the station data communications circuit (7), and a reading circuit (17) within the data card (2) including: a pulse generation circuit coupled to the card resonant circuit (11) for generating a pulse in response to a predetermined change in state of the power received by the card resonant circuit (11), and a data converter (15) coupled to the pulse generation circuit and responsive to said pulse, whereby the output of the data converter (15) corresponds to said second data.
Claim 2
Dependent Claim
272 words
A data transmission system for the non-contact transmission of data between a station (1) and a portable data card (2), wherein the station (1) includes: a station resonant circuit (5) tuned to a first signal, and a demodulator (4) for detecting a second signal superimposed on the first signal, and wherein the portable data transaction card (2) includes: a card resonant circuit (11) responsive to the station resonant circuit (5) for inductive coupling therewith so as to receive power from the station (1), and a card data communications circuit (18) designed to be powered by said received power for loading the card resonant circuit thereby modulating the first signal with the second signal in response to first data stored within the card data communications circuit (18) and, by means of said inductive coupling, enabling the first data to be transmitted from the card (2) to the station (1); characterized in that there is further provided: a station data communications circuit (7) within the station (1) for deactuating the station resonant circuit (5) end, by means of said inductive coupling, for deactuating the card resonant circuit (11) in response to second data stored in the station data communications circuit (7), and a reading circuit (17) within the data card (2) including: a pulse generation circuit coupled to the card resonant circuit (11) for generating a pulse in response to a predetermined change in state of the power received by the card resonant circuit (11), and a data converter (15) coupled to the pulse generation circuit and responsive to said pulse, whereby the output of the data converter (15) corresponds to said second data.
Claim 3
Dependent Claim
33 words
A system in accordance with Claim 1, characterized in that: the station data communications circuit (7) includes a deactuating circuit for deactuating the station resonant circuit (5) in response to the second data.
Claim 4
Dependent Claim
51 words
A system in accordance with Claim 1 or 2, characterized in that: the station resonant circuit (5) is responsive to a first frequency signal and that there is provided an oscillator (20) for generating a second frequency signal which is converted to the first frequency signal by frequency divider means (21).
Claim 5
Dependent Claim
24 words
A system in accordance with Claim 3, characterized in that: the frequency divider means (21) is controlled by the station data communications circuit (7).
Claim 6
Dependent Claim
55 words
A system in accordance with Claim 4, characterized in that the station (1) further includes: a deactuating circuit for deactuating the station resonant circuit (5) in response to the second data, comprising: means for altering the division ratio of the frequency divider means (21) so as to prevent the station resonant circuit (5) from oscillating.
Claim 7
Independent Claim
137 words
A system in accordance with any one of Claims 2 to 5, characterized in that: the portable data card (2) further includes rectifier means (40, 41) coupled to a smoothing capacitor (43) for rectifying the received power, and the pulse generation circuit includes a capacitor (49) for discharging when the power received by the card resonant circuit (11) falls and recharging when the received power rises; the capacitor (49) being adapted to discharge with a first time constant when the deactuating circuit is operated and to recharge with a second time constant when the deactuating circuit is disabled, such that: the first time constant is substantially greater than the second time constant, and the time interval between the successive discharge and recharge of the capacitor (49) is insufficient to cause the smoothing capacitor (43) substantially to discharge.
Claim 8
Dependent Claim
74 words
A station (1) for use in a system in accordance with any one of the preceding claims, the station (1) including: a resonant circuit (5) tuned to a first signal, and a demodulator (4) for detecting a second signal superimposed on the first signal, and characterized in that there is further provided: a data communications circuit (7) for deactuating the resonant circuit (5) in response to data stored within the data communications circuit (7).
Claim 9
Dependent Claim
31 words
A station (1) in accordance with Claim 7, characterized in that: the data communications circuit (7) includes a deactuating circuit for deactuating the resonant circuit (5) in response to said data.
Claim 10
Dependent Claim
95 words
A station (1) in accordance with Claim 7 or 8, characterized in that: the resonant circuit (5) is responsive to a first frequency signal and that there is provided an oscillator (20) for generating a second frequency signal which is converted to the first frequency signal by frequency divider means (21), and that there is further provided: a deactuating circuit for deactuating the resonant circuit (5) in response to said data, and including means for altering the division ratio of the frequency divider means (21) so as to prevent the resonant circuit (5) from oscillating.
Claim 11
Dependent Claim
141 words
A card (2) for use in a system in accordance with any one of Claims 1 to 6, including: a resonant circuit (11) tuned to a first signal, and a data communications circuit (18) designed to be powered by power received by the resonant circuit (11) for loading the resonant circuit (11) in response to data stored within the data communications circuit (18), and characterized in that there is further provided: a reading circuit (17) including: a pulse generation circuit coupled to the resonant circuit (11) for generating a pulse in response to a predetermined change in state of the power received by the resonant circuit (11), and a data converter (15) coupled to the pulse generation circuit and responsive to said pulse, whereby the output of the data converter (15) corresponds to a data signal transmitted to the card (2).
Claim 12
Dependent Claim
126 words
A card (2) in accordance with Claim 10, characterized in that: there is further provided rectifier means (40, 41) coupled to a smoothing capacitor (43) for rectifying the received power, and the pulse generation circuit includes a capacitor (49) for discharging when the power received by the resonant circuit (11) falls and recharging when the received power rises; the capacitor (49) being adapted to discharge with a first time constant when the received power falls and to recharge with a second time constant when the received power rises, such that: the first time constant is substantially greater than the second time constant, and the time interval between successive discharge and recharge of the capacitor (49) is insufficient to cause the smoothing capacitor (43) substantially to discharge.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.