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Sampling circuit, method, compressor and air conditioner with improved precision

A sampling circuit, sampling voltage technology, applied in mechanical equipment, logic circuit connection/interface layout, machine/engine, etc., can solve the problem of low sampling accuracy, and achieve the effect of precise current sampling and precise control

Active Publication Date: 2021-03-12
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] An embodiment of the present invention provides a sampling circuit, method, compressor and air-conditioning equipment with improved precision to solve the problem in the prior art that when the sampling voltage decreases with the current of the compressor, the sampling accuracy will become lower

Method used

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  • Sampling circuit, method, compressor and air conditioner with improved precision
  • Sampling circuit, method, compressor and air conditioner with improved precision
  • Sampling circuit, method, compressor and air conditioner with improved precision

Examples

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Embodiment 1

[0041] This embodiment provides a sampling circuit with improved precision, figure 1 It is a structural diagram of a sampling circuit according to an embodiment of the present invention, such as figure 1 As shown, the sampling circuit includes a sampling module 11, an operation module 12 and a digital signal processor 13; the sampling module 11 is connected between the compressor 14 and the reference ground, and includes: a second compressor arranged in parallel between the compressor and the reference ground A sampling branch 111 and a second sampling branch 112, the first sampling branch 111 and / or the second sampling branch 112 change the conduction state under the control of the digital signal processor 13; the computing module 12, its first The input end is connected between the compressor 14 and the sampling module 11, its second input end is connected to the reference ground, and its output end is connected to the digital signal processor 13, which is used to perform ar...

Embodiment 2

[0044] This embodiment provides another sampling circuit with improved precision, figure 2 It is a structural diagram of a sampling circuit according to another embodiment of the present invention. In order to control the conduction state of the first sampling branch 111 and / or the second sampling branch 112, as figure 2 As shown, the second sampling branch 112 is provided with a switch Q, and the switch Q is connected to the second interface DSP2 of the digital signal processor to be turned on or off under the control of the digital signal processor. It should be noted that, in the present invention In other embodiments, the switch can also be set on the first sampling branch 111, and switches can also be set on both the first sampling branch 111 and the second sampling branch 112, wherein the above-mentioned switch Q can be a MOSFET switch tube or The IGBT switch tube can be selected by those skilled in the art according to actual needs, and is not specifically limited in ...

Embodiment 3

[0051] This embodiment provides another sampling circuit with improved precision, image 3 It is a structural diagram of a sampling circuit according to another embodiment of the present invention, as image 3 As shown, the circuit includes: first sampling resistor R31, second sampling resistor R32, operational amplifier positive input resistor R33, operational amplifier inverting input resistor R34, feedback resistor R35, switch tube Q1, operational amplifier U1-A And the digital signal processor, that is, DSP, wherein, the second sampling resistor R32 is selected according to the maximum current that the switching tube Q1 can withstand, and the first sampling resistor R31 is selected according to the second sampling resistor R32 and the rated current of the compressor. When the compression When the current of the compressor is large, the corresponding I / O port of the DSP outputs a high level, and when the current of the compressor drops to 1 / 10 to 1 / 5 of the rated current of...

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Abstract

The invention discloses a sampling circuit and method for improving accuracy, a compressor and an air conditioning device. The sampling circuit comprises a sampling module, an operation module and a digital signal processor, wherein the sampling module is connected between the compressor and reference ground and comprises a first sampling branch and a second sampling branch which are arranged in parallel between the compressor and the reference ground; the sampling module changes the connection state under the control of the digital signal processor; the first input end of the operation moduleis connected between the compressor and the sampling module, the second input end of the operation module is connected with the reference ground, and the operation module is used for calculating andprocessing voltage output by the sampling module to obtain sampling voltage; and the digital signal processor is connected with the operation module and controls the connection state according to thesampling voltage obtained after calculating and processing. According to the sampling circuit, the total resistance of the sampling module can be adaptively changed, and more accurate current samplingis carried out when the current of the compressor is low, so that the compressor can be more accurately controlled.

Description

technical field [0001] The invention relates to the technical field of electronic power, in particular to a sampling circuit, a method, a compressor and an air conditioner with improved precision. Background technique [0002] In the existing frequency conversion drive air conditioner technology, the compressor current is sampled through a single resistor. When the compressor current is small, the sampling voltage of the sampling resistor also becomes small. Due to possible superimposed interference and other reasons, under the condition of not changing the gain of the op amp, when the compressor current is small, the accuracy of the sampled value after passing through the op amp will be lower than under normal conditions, which will affect the performance of the compressor in this case. control. [0003] Aiming at the problem in the prior art that the sampling accuracy becomes lower when the sampling voltage decreases with the compressor current, no effective solution has...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04B49/06H03K19/0175
CPCF04B49/065H03K19/0175
Inventor 贺小林王慧磊黄银彬史欧阳刘文斌杨帆
Owner GREE ELECTRIC APPLIANCES INC
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