Electric circuit and transmission method for telemetric transmission

• US 20050135039A1
• Filed: 12/13/2004
• Published: 06/23/2005
• Est. Priority Date: 12/16/2003
• Status: Active Grant

• Current Assignee: Polar Electro Oy
• Original Assignee: Polar Electro Oy
• Inventors: Klemetti, Janne
• Granted Patent: US 7,418,237 B2
• Time in Patent Office: Days
• US Class Current: 361/119
• CPC Class Codes: A61B 5/0002 Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network A61B5/07 takes precedence; transmission systems for measured values G08C; transmission H04B; transmission of digital information H04L; wireless communication networks H04W
• CPC Class Codes: A61B 5/02438 with portable devices, e.g. worn by the patient
• CPC Class Codes: A61B 5/6831 Straps, bands or harnesses

Abstract

The invention relates to an electric circuit for a telemetric transmission. A semiconductor transistor switch switches a quenching circuit into an electrically conductive state to prevent oscillation of a resonance circuit. The semiconductor transistor switch switches the quenching circuit into a state preventing the passage of electric current to enable oscillation of the resonance circuit. The quenching circuit comprises at least one restriction component for preventing the passage of a base current of the semiconductor transistor switch when the semiconductor transistor switch is switched open.

Claims

1. An electric circuit for an inductively implemented low-frequency telemetric transmission, the electric circuit comprising

a direct current source for supplying electric power to the electric circuit;

a resonance circuit for telemetric transmission;

a quenching circuit coupled to the resonance circuit and comprising a semiconductor transistor switch;

the semiconductor transistor switch being configured to switch the quenching circuit into an electrically conductive state to prevent oscillation of the resonance circuit, and the semiconductor transistor switch being configured to switch the quenching circuit into a state preventing the passage of electric current to enable oscillation of the resonance circuit, wherein

the quenching circuit comprises at least one electric restriction component for preventing the passage of a base current of the semiconductor transistor switch when the semiconductor transistor switch is switched open.

2. An electric circuit as claimed in claim 1, wherein at least one electric restriction component comprised by the quenching circuit is a diode coupled between one pole of the resonance circuit and the semiconductor transistor switch in a non-conducting direction to prevent the passage of current from a collector to a base of the semiconductor transistor switch.

3. An electric circuit as claimed in claim 1, wherein at least one electric restriction component comprised by the quenching circuit is a diode coupled in a forward direction in parallel with a collector and a base of the semiconductor transistor switch.

4. An electric circuit as claimed in claim 1, wherein at least one electric restriction component comprised by the quenching circuit is a diode coupled in parallel with a collector of the semiconductor transistor switch and a base resistor in a forward direction from the collector to a pole of the base resistor.

5. An electric circuit as claimed in claim 1, wherein at least one electric restriction component is placed in the quenching circuit on a stretch from the semiconductor transistor switch and to a pole of the resonance circuit, the pole being farther from a positive pole of the direct current source when propagating from the positive pole of the direct current source towards a negative pole of the direct current source.

6. An electric circuit as claimed in claim 1, wherein at least one electric restriction component is placed in a portion of the quenching circuit between the semiconductor transistor switch and a positive pole of the direct current source.

7. An electric circuit as claimed in claim 1, wherein the electric circuit is intended for use in a telemetric data transfer system wherein data are transferred between a body and a limb.

8. A telemetric, inductive and low-frequency transmission method comprising

switching a quenching circuit, coupled with a semiconductor transistor switch to a resonance circuit, into an electrically conductive state to prevent oscillation of the resonance circuit;

switching the quenching circuit with the semiconductor transistor switch into a state preventing the passage of electric current to enable oscillation of the resonance circuit; and

preventing the passage of electric current on a base of the semiconductor transistor switch when the semiconductor transistor switch is switched open with at least one electric restriction component comprised by the quenching circuit.