Sensor and method for detecting an object
First Claim
1. A sensor for detecting an object, comprising:
- a probe electrode for forming a measuring capacitance (C1) with the object to be detected,a charge generator for generating an alternating charging voltage (U3), wherein the probe electrode is charged by the alternating charging voltage (U3),an amplifier (A) for amplifying an input voltage, the input voltage comprising a voltage across the measuring capacitance (C1), wherein the amplifier (A) includes a first supply voltage connection (A1) and a second supply voltage connection (A2),a processing component for processing signals that are outputted at an output of the amplifier (A) to form at least one output signal, andat least one sensor output for outputting the at least one output signal, wherein a second supply voltage (U2) in the form of a DC voltage is directly connected to the second supply voltage connection (A2), anda first supply voltage (U1) having an AC voltage portion is directly connected to the first supply voltage connection (A1), wherein the AC voltage portion is generated by a supply voltage generator,wherein the charge generator and the supply voltage generator comprise the same generator and wherein the AC voltage portion of the first supply voltage (U1) is determined by the alternating charging voltage (U3).
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Abstract
The invention relates to a sensor for detecting an object. The sensor includes a probe electrode for forming a measuring capacitance with the object to be detected, a charging generator for generating an alternating charging voltage, wherein the probe electrode is charged by means of the alternating charging voltage, an amplifier for amplifying a voltage across the measuring capacitance, wherein the amplifier includes a first supply connection and a second supply connection, electronic means for processing signals outputted at an output of the amplifier to form at least one output signal and at least one sensor output for outputting the at least one output signal. According to the invention, the sensor is characterized in that a DC voltage in the form of a second supply voltage is connectable to the second supply connection, and that a first supply voltage having an AC voltage portion is connectable to the first supply connection, wherein a supply voltage generator is available for generating the DC voltage portion. The invention also relates to a method for detecting an object.
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Citations
19 Claims
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1. A sensor for detecting an object, comprising:
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a probe electrode for forming a measuring capacitance (C1) with the object to be detected, a charge generator for generating an alternating charging voltage (U3), wherein the probe electrode is charged by the alternating charging voltage (U3), an amplifier (A) for amplifying an input voltage, the input voltage comprising a voltage across the measuring capacitance (C1), wherein the amplifier (A) includes a first supply voltage connection (A1) and a second supply voltage connection (A2), a processing component for processing signals that are outputted at an output of the amplifier (A) to form at least one output signal, and at least one sensor output for outputting the at least one output signal, wherein a second supply voltage (U2) in the form of a DC voltage is directly connected to the second supply voltage connection (A2), and a first supply voltage (U1) having an AC voltage portion is directly connected to the first supply voltage connection (A1), wherein the AC voltage portion is generated by a supply voltage generator, wherein the charge generator and the supply voltage generator comprise the same generator and wherein the AC voltage portion of the first supply voltage (U1) is determined by the alternating charging voltage (U3). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for detecting an object,
wherein a measuring capacitance (C1) is formed by means of a probe electrode and the object to be detected, wherein the probe electrode is charged by means of an alternating charging voltage (U3) generated by a charge generator, wherein a voltage across the measuring capacitance (C1) is provided to an input of an amplifier (A), the amplifier amplifying the input voltage, wherein signals outputted at an output of the amplifier (A) are processed to form at least one output signal and wherein the at least one output signal is outputted, wherein a second supply voltage (U2) in the form of a DC voltage is directly connected to a second supply voltage connection (A2) of the amplifier (A) and wherein a first supply voltage (U1) having an AC voltage portion is directly connected to a first supply voltage connection (A1) of the amplifier (A), wherein the AC voltage portion is generated by a supply voltage generator, wherein the charge generator and the supply voltage generator comprise the same generator and wherein the AC voltage portion of the first supply voltage (U1) is determined by the alternating charging voltage (U3).
Specification