Capacitive sensor device and method for operating a capacitive sensor device
A sensor device, capacitive technology, applied in the direction of using electric/magnetic devices to transmit sensing components, electronic switches, electrical components, etc., can solve the detection quality and stability of proximity or contact, do not know the grounding reference of electrical devices, Problems such as cost increase of capacitive sensor devices
Inactive Publication Date: 2013-10-30
MICROCHIP TECH GERMANY II
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Problems solved by technology
The capacitive sensor devices known from the prior art have the disadvantage, especially when they are used in mobile electric devices, that the quality and stability of the detection of an approach or a contact is largely dependent on the ground reference or ground reference of the mobile device. The connection between the ground of the device and the operator of the mobile device
[0006] However, the disadvantage of this approach is that most of the time it is not known whether the electrical device has a ground reference, or how strong the electrical device's ground coupling is
However, in order to detect the strength of the ground reference or ground coupling, additional measures must be taken, which necessarily leads to a significant increase in the cost of the capacitive sensor device
Method used
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[0033] figure 1 A block scheme of a capacitive sensor device for proximity and / or contact detection according to the invention that can be coupled with a circuit 10 is shown. Circuit 10 may be, for example, device electronics of a mobile phone or another device, especially a mobile device.
[0034] The capacitive sensor device shows sensor electronics 20 and an electrode configuration coupled to the sensor electronics 20 . The electrode configuration comprises a transmitting electrode SE, a compensating electrode KE and a receiving electrode EE. For detecting approach or contact, the sensor electrodes of the electrode arrangement are arranged, for example, on the housing of the electric hand-held device.
[0035] The sensor electrode SE and the compensation electrode KE are each supplied with an alternating current signal, wherein the alternating current signal supplied to the compensation electrode KE may preferably be phase-shifted with respect to the alternating current s...
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The invention provides a capacitive sensor device for approach and / or contact detection which can be coupled with an electric circuit (10) and which comprises a sensor electronics (20) and a device for potential separation (30), which with the sensor electronics (20) is coupled and by means of which the capacitive sensor device can be coupled with the electric circuit (10). It also provides a method for operating a capacitive sensor device which comprises a sensor electronics wherein the sensor electronics can be coupled with an electric circuit and wherein the sensor electronics is coupled with the electric circuit in a separable way with respect to the potential.
Description
technical field [0001] The invention relates to a capacitive sensor device for proximity and / or contact detection, which can be coupled to an electrical circuit, for example a microprocessor of an electric hand-held device. Furthermore, the invention relates to a method for operating a capacitive sensor device for approach and / or contact detection. Background technique [0002] Capacitive proximity and / or contact sensors measure the proximity of an object to or the touch of an object on a sensor electrode by generating and measuring an alternating electric field. The capacitive sensor devices known from the prior art have the disadvantage, especially when they are used in mobile electric devices, that the quality and stability of the detection of an approach or a contact is largely dependent on the ground reference or ground reference of the mobile device. The connection between the ground of the device and the operator of the mobile device. [0003] For example, the conne...
Claims
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IPC IPC(8): H03K17/955H03K17/96
CPCH03K2217/960705H03K2217/960775H03K17/962H03K2017/9615H03K17/955G01D5/24H03K17/96
Inventor 克劳斯·卡尔特纳
Owner MICROCHIP TECH GERMANY II