Sampling circuit, temperature detection circuit and electrical equipment
A technology of temperature detection circuit and sampling circuit, which is applied in thermometer testing/calibration, thermometer, electric device, etc., can solve the problem of inaccurate detection and achieve the effect of ensuring detection accuracy
Active Publication Date: 2021-06-01
GREE ELECTRIC APPLIANCES INC
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[0004] The embodiment of the present invention proposes a sampling circuit, a temperature detection circuit and electrical equipment to solve the problem in the prior art that a fixed compensation value is used to compensate the voltage drop of the tube, resulting in inaccurate detection
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[0024] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.
[0025] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which this invention belongs. It should also be understood that terms, such as those defined in commonly used dictionaries, should be understood to have meanings consistent with the meanings in the co...
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The invention provides a sampling circuit, a temperature detection circuit and electrical equipment. The sampling circuit comprises a sampling resistor, a calibration circuit and a diode used for isolation, wherein the sampling resistor is connected with a to-be-sampled circuit. The anode of the diode is connected with a to-be-detected resistor in a to-be-sampled circuit, and the cathode of the diode is connected with the sampling resistor, so that the sampling resistor is isolated from other connecting circuits of the to-be-sampled circuit; the calibration circuit is connected with the anode of the diode to detect the tube voltage drop of the diode; the sampling resistor and the to-be-detected resistor are connected in series to perform voltage division on a power supply VCC of the to-be-sampled circuit; one end of the sampling resistor is grounded, the other end of the sampling resistor is connected with a sampling detection end of a main control chip; and the main control chip calculates the resistance value of the to-be-detected resistor according to the voltage division value of the sampling resistor, the resistance value of the sampling resistor and the tube voltage drop of the diode. According to the sampling circuit, the temperature detection circuit and the electrical equipment of the invention, the actual voltage drop of the diode is measured through the calibration circuit, and a compensation value is set as the measured actual voltage drop, so that the detected sampling value and the actual value can be kept consistent, and the detection accuracy is ensured.
Description
technical field [0001] The invention relates to the technical field of circuit design, in particular to a sampling circuit, a temperature detection circuit and electrical equipment. Background technique [0002] At present, most products use sampling circuits in circuit function design, such as temperature detection through NTC thermistors, and according to the needs of application scenarios, sampling circuits will also be connected to other circuits. In order to avoid the influence of other circuits, At this time, a diode needs to be added for isolation. [0003] Because there is a tube voltage drop in the diode, it will cause a deviation between the detected sampling value and the actual signal value. In order to compensate the tube voltage drop, the conventional method in the prior art is to set a fixed compensation value in the program to adjust the tube voltage drop. compensate. However, the diode voltage drop generally has a range and is related to the ambient temper...
Claims
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IPC IPC(8): G01K7/24G01K15/00
CPCG01K7/24G01K15/005
Inventor 敬仕林李俊锴
Owner GREE ELECTRIC APPLIANCES INC