Self-excited coil induction angular position sensor and angular position detection method

Abstract

The invention discloses a self-excited coil induction angular position sensor and an angular position detection method. The angular position sensor comprises at least three induction coils, a coil inductance interference mechanism, at least one inductance detection circuit and an angular position acquisition circuit, wherein at least three induction coils form a coil group; the coil inductance interference mechanism is arranged on one side of the coil assembly, and when the induction coil is covered by the coil inductance interference mechanism, the inductance value corresponding to the induction coil changes; the inductance detection circuit is used for acquiring an inductance value of a set induction coil; and the angular position acquisition circuit is connected with the inductance detection circuit and is used for acquiring a rotation angle according to the change of the inductance value of each induction coil. According to the self-excited coil induction angular position sensor and the angular position detection method provided by the invention, a larger single induction coil size and an initial inductance value can be provided under the same area, so a higher detection distance can be provided.

Description

technical field [0001] The invention belongs to the technical field of sensors, and relates to an angle sensor, in particular to a self-excited coil induction angle sensor and an angle detection method. Background technique [0002] At present, the most common fluid measurement scheme is based on the fluid flow driving mechanical parts to rotate to detect the flow velocity, flow direction and flow rate of the fluid. In order to achieve intelligence, a common solution is to add a rotation detection device to the traditional mechanical instrument to convert the mechanical rotation signal into an electrical signal for digital processing by subsequent circuits. [0003] Commonly used rotation detection devices have the following schemes: [0004] The first solution is to use magnetic sensors, usually with small permanent magnets on the rotor. When the rotor rotates, a periodically changing magnetic field signal will be generated at a certain position around it, and the magneti...

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Problems solved by technology

[0013] Since the induced electromotive force generated by L1 and L3 is weak (in applications such as water meters and gas meters, the induced electromotive force is often lower than the turn-on voltage of the triode), in order to turn on the triode, it is necessary to generate a negative voltage through the capacitor to turn on the triode. It is difficult to realize in the integrated circuit (IC); in addition, each induction coil of this scheme needs to be equipped with 3 resistors, 2 capacitors, 1 switch and 1 triode. In addition to the large material loss, the devices that affect the sensor performance increase, but also increases the difficulty of product performance control

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