Refrigerator parameter collection device

Abstract

The present invention provides a refrigerator parameter acquisition device, including a data acquisition module and a conditioning output module connected to the data acquisition module; the data acquisition module includes: a voltage acquisition unit, a current acquisition unit and at least one of a temperature acquisition unit; the voltage acquisition unit is used to acquire the input voltage of the main control board; the current acquisition unit is used to acquire the input current of the main control board and the input current from the main control board to the frequency conversion board; the temperature acquisition unit is used to acquire the temperature of refrigeration components; the conditioning output module is used to convert all parameters acquired by the data acquisition module into voltage for output. The refrigerator parameter acquisition device of the present invention uses the least components to realize the acquisition of basic parameters, and converts all the acquired parameters into voltage signal output, so as to facilitate docking with PHM technology and improve refrigerator performance.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to a refrigerator parameter acquisition device. Background Art

[0002] Refrigerators have become essential household appliances for many families. With the advancement of technology, users have higher and higher requirements for the performance of refrigerators.

[0003] In order to avoid adding more costs, the development direction of refrigerators is committed to achieving better performance with minimal changes based on the structure of existing refrigerators; among them, PHM technology is gradually being applied to the control system of refrigerators. PHM is the abbreviation of Prognostic and Health Management. In electronic systems, the main significance of PHM is to predict the time and location of upcoming failures in advance, predict the RUL (Remaining Useful Life) of the entire system, improve the operating reliability of the system, reduce the maintenance cost of the system and improve the accuracy of maintenance, and realize CBM (Condition Based Maintainence) of electronic systems.

[0004] In order to connect with PHM technology, a new parameter acquisition circuit needs to be introduced into the refrigerator based on the existing structure. Summary of the invention

[0005] The object of the present invention is to provide a refrigerator parameter collection device.

[0006] In order to achieve one of the above-mentioned purposes of the invention, an embodiment of the present invention provides a refrigerator parameter acquisition device, comprising: a data acquisition module and a conditioning output module connected to the data acquisition module;

[0007] The data acquisition module includes: at least one of a voltage acquisition unit, a current acquisition unit and a temperature acquisition unit;

[0008] The voltage acquisition unit is used to collect the input voltage of the main control board;

[0009] The current acquisition unit is used to collect the input current of the main control board and the input current from the main control board to the frequency conversion board;

[0010] The temperature collection unit is used to collect the temperature of the refrigeration components;

[0011] The conditioning output module is used to convert the parameters collected by the data collection module into voltage for output.

[0012] As a further improvement of an embodiment of the present invention, the voltage acquisition unit is an AC voltage sensor, and the conditioning output module is an AC voltage detection conditioning unit connected to the AC voltage sensor;

[0013] The AC voltage sensor is used to collect the input AC voltage and convert the input AC voltage into a low voltage signal;

[0014] The AC voltage detection and conditioning unit is used to extract the voltage peak value in the voltage signal and output it.

[0015] As a further improvement of an embodiment of the present invention, the current acquisition unit is an AC current sensor, and the conditioning output module is an AC voltage detection conditioning unit connected to the AC current sensor;

[0016] The AC current sensor is used to collect input current and convert the input AC current into a low-voltage signal;

[0017] The AC voltage detection and conditioning unit is used to extract the voltage peak value in the voltage signal and output it.

[0018] As a further improvement of an embodiment of the present invention, the AC voltage detection and conditioning unit comprises: a first-order filter circuit, a peak detection circuit, a second-order filter circuit and a polarity protection circuit connected in sequence;

[0019] The first-order filter circuit is used to filter out noise interference in the power grid;

[0020] The peak detection circuit is used to track and detect the peak value of the signal output by the first-order filtering circuit;

[0021] The second-order filtering circuit is used to perform secondary filtering on the output signal of the peak detection circuit;

[0022] The polarity protection circuit is used to limit the output signal of the secondary filtering.

[0023] As a further improvement of an embodiment of the present invention, the input voltage collected by the voltage collection unit is V X Indicates that the first output voltage V after the conditioning output module 01 It is expressed as:

[0024] As a further improvement of an embodiment of the present invention, the input current collected by the current collection unit is I X The second output voltage V after the conditioning output module is 02 Expressed as: V 02 =3.535I X .

[0025] As a further improvement of an embodiment of the present invention, the temperature acquisition unit is a temperature sensor, and the conditioning output module is a temperature conditioning unit connected to the temperature sensor;

[0026] The temperature sensor is used to collect input temperature information and convert the input temperature information into a resistance signal;

[0027] The temperature conditioning unit is used to convert the resistance signal into a voltage signal and output it.

[0028] As a further improvement of an embodiment of the present invention, the temperature conditioning unit specifically comprises: a matching voltage divider circuit and a filter circuit connected in sequence;

[0029] The voltage divider circuit is used to connect the received resistance signal in series with a preset resistance to divide the preset voltage and convert it into a voltage transfer output signal;

[0030] The filter circuit is used to filter the voltage transfer output signal to produce a voltage signal and output it.

[0031] As a further improvement of an embodiment of the present invention, the input resistance collected by the temperature collection unit is R T The third output voltage V after the conditioning output module is 03 It is expressed as: Wherein, R1 represents a preset resistor.

[0032] As a further improvement of an embodiment of the present invention, the temperature sensor is a thermal resistor.

[0033] The beneficial effect of the present invention is that the refrigerator parameter acquisition device of the present invention uses the least components to realize the acquisition of basic parameters, and converts all the acquired parameters into voltage signal outputs to facilitate docking with PHM technology and improve refrigerator performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of a module of a refrigerator parameter acquisition device provided by one embodiment of the present invention;

[0035] Figure 2 It is a schematic diagram of the overall structural module of a refrigerator parameter acquisition device according to a specific example of the present invention;

[0036] Figure 3 It is a circuit structure diagram of an AC voltage detection and conditioning unit in a specific example of the present invention;

[0037] Figure 4 It is a schematic diagram of the circuit structure of a temperature conditioning unit in a specific example of the present invention. DETAILED DESCRIPTION

[0038] The present invention will be described in detail below in conjunction with the embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural or functional changes made by a person skilled in the art based on these embodiments are all within the protection scope of the present invention.

[0039] Combination Figure 1 As shown, one embodiment of the present invention provides a refrigerator parameter acquisition device, including: a data acquisition module 100 and a conditioning output module 200 connected to the data acquisition module 100; the data acquisition module 100 includes: a voltage acquisition unit 101 for collecting voltage, a current acquisition unit 103 for collecting current, and a temperature acquisition unit 105 for collecting temperature.

[0040] In a specific implementation of the present invention, the voltage acquisition unit 101 is used to acquire the input voltage of the main control board; the current acquisition unit 103 is used to acquire the input current of the main control board and the input current from the main control board to the frequency conversion board; the temperature acquisition unit 105 is used to acquire the temperature of refrigeration components; the conditioning output module 200 is used to convert the parameters collected by the data acquisition module 100 into voltage for output.

[0041] In a specific embodiment of the present invention, the refrigeration component includes: at least one of a refrigeration evaporator, a freezing evaporator and a compressor.

[0042] Combination Figure 2 As shown, in a specific example of the present invention, the voltage acquisition unit 101 is an AC voltage sensor S1, which is arranged at the 220V power inlet of the main control board and is used to acquire the input voltage of the main control board; the conditioning output module 200 is an AC voltage detection and conditioning unit T1 connected to the AC voltage sensor S1; the AC voltage sensor S1 is used to acquire the input AC voltage and convert the input AC voltage into a low voltage signal; the AC voltage detection and conditioning unit T1 is used to extract the voltage peak value in the voltage signal output by the AC voltage sensor S1 and continue to output it, so that the collected voltage is rectified and transformed through the cooperation of the two and then output to the ADC converter for collection.

[0043] The current acquisition unit 103 includes two AC current sensors, namely, an AC current sensor S2 and an AC current sensor S6, wherein the AC current sensor S2 is arranged at the 220V power input of the main control board, and is used to collect the input current of the main control board and convert the input AC current into a low-voltage signal; the AC current sensor S6 is arranged at the power supply output end of the main control board to the frequency conversion board, and is used for the input current of the main control board to the frequency conversion board and converting the input AC current into a low-voltage signal.

[0044] Corresponding to the AC current sensor S2, the conditioning output module 200 is an AC voltage detection conditioning unit T2 connected to the AC current sensor S2; corresponding to the AC current sensor S6, the conditioning output module 200 is an AC voltage detection conditioning unit T6 connected to the AC current sensor S6; the AC voltage detection conditioning units T2 and T6 are both used to extract the voltage peak value in the voltage signal output by the AC current sensor S2 and continue to output it. In this way, the collected current is conditioned and output to the ADC converter for collection through the cooperation of any two.

[0045] The temperature acquisition unit 105 includes three temperature sensors, namely temperature sensor S3, temperature sensor S4 and temperature sensor S5, wherein temperature sensor S3 is arranged at the inlet of the refrigerated evaporator, for collecting the temperature information input at the inlet of the refrigerated evaporator and converting the input temperature information into a resistance signal; temperature sensor S4 is arranged at the outlet of the compressor, for collecting the temperature information input at the outlet of the compressor and converting the input temperature information into a resistance signal; temperature sensor S5 is arranged at the inlet of the frozen evaporator, for collecting the temperature information input at the inlet of the frozen evaporator and converting the input temperature information into a resistance signal.

[0046] Corresponding to the temperature sensor S3, the temperature sensor S4 and the temperature sensor S5, the conditioning output module 200 is a temperature conditioning unit T3 connected thereto; the temperature conditioning unit T3 is used to convert the resistance signal into a voltage signal and output it, so that the collected resistance is conditioned and output to the ADC converter for collection through the cooperation of any two.

[0047] In a preferred embodiment of the present invention, the temperature sensor S3, the temperature sensor S4 and the temperature sensor S5 are all thermal resistors.

[0048] In a preferred embodiment of the present invention, the AC voltage detection and conditioning unit specifically includes: a first-order filter circuit, a peak detection circuit, a second-order filter circuit and a polarity protection circuit connected in sequence; the first-order filter circuit is used to filter out noise interference in the power grid; the peak detection circuit is used to track and detect the peak value of the signal output by the first-order filter circuit; the second-order filter circuit is used to perform secondary filtering on the output signal of the peak detection circuit; and the polarity protection circuit is used to limit the output of the secondary filtered output signal.

[0049] In the first specific implementation mode of the present invention, the input voltage of the main control board is collected by the AC voltage sensor S1 as an example for specific introduction; in this example, the voltage output by the AC voltage sensor S1 is In particular, when the input voltage is 220V,

[0050] In this example, combined Figure 3 As shown in the figure, the circuit structure diagram of the AC voltage detection and conditioning unit T1; the first-order filter circuit composed of R1 and C1, R1 takes a value of 10K, and C1 takes a value of 220PF. In the filtering process, in order to reduce the phase error in the power grid, the time constant involved needs to be much smaller than the output frequency of the power grid, that is: τ=RC=1×10 3 ×220×10 -12 =2.2×10 -6 s, that is 0.02S.

[0051] The signal after filtering enters the peak detection circuit. The peak detection circuit controls the comparator U1A output by D3 and D4 to charge the capacitor C3 to realize the peak tracking and detection of the input signal.

[0052] Afterwards, the signal is filtered through a second-order filter circuit composed of R4 and C2, and finally enters the ADC converter after passing through a polarity protection circuit composed of D1 and D2.

[0053] Then the first output voltage V after the conditioning output module 01 It is expressed as:

[0054]

[0055] In this way, the voltage value collected by the AC voltage sensor S1 is conditioned by the AC voltage detection conditioning unit T1 and output to the AD acquisition port of the CPU as 0-5V for direct transmission.

[0056] In the second specific implementation mode of the present invention, the input current of the main control board is collected by the AC current sensors S2 and S6 as an example for specific introduction; in this example, it is assumed that the input current I X =1.6A, then its output voltage In this example, the AC voltage detection and conditioning units T2 and T6 have the same implementation principle as the AC voltage detection and conditioning unit T1, so the circuit and implementation process thereof are not described in detail. Thus, for any AC current sensor, the second output voltage V after the conditioning output module is 02 Expressed as: V 02 =V 2p =V i2 ×1.414=2.5I X ×1.414=3.535I X In this way, the voltage values ​​collected by the AC current sensors S2 and S6 are conditioned by the AC voltage detection and conditioning units T2 and T6 respectively, and then output to the AD acquisition port of the CPU as 0-5V for direct transmission.

[0057] In a preferred embodiment of the present invention, the temperature conditioning unit specifically includes: a matching voltage divider circuit and a filter circuit connected in sequence; the voltage divider circuit is used to connect the received resistance signal in series with a preset resistance to divide the preset voltage and convert it into a voltage transfer output signal; the filter circuit is used to filter the voltage transfer output signal to produce a voltage signal and output it.

[0058] In the third specific embodiment of the present invention, the temperature of the refrigeration evaporator inlet is collected by the temperature sensor S3 as an example for specific introduction; in this example, the resistance collected by the temperature sensor S3 is R T express.

[0059] In this example, combined Figure 4 As shown in the figure, the circuit structure diagram of the temperature conditioning unit T3 is described in detail by taking the one-way conditioning circuit as an example; in the voltage divider circuit, the resistance change signal output by the temperature sensor is connected in series with the resistor R1 to jointly realize the voltage division of +5V, which can convert the resistance of the temperature sensor into a voltage output. The voltage division ratio is mainly determined by the measurement range of the temperature sensor to be measured and the size of R1, and then the noise is filtered out by the filter circuit composed of R4 and C3. Finally, the output signal of the filter circuit is sent to the AD converter for conversion to realize the temperature detection of the corresponding position.

[0060] The third output voltage V after the conditioning output module 03 It is expressed as: Here, R1 represents a preset resistor, and the process will not be further described.

[0061] In summary, the refrigerator parameter acquisition device of the present invention uses the least components to realize the acquisition of basic parameters, and converts all the acquired parameters into voltage signal outputs, so as to facilitate the connection with PHM technology and improve the performance of the refrigerator.

[0062] It should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0063] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A refrigerator parameter collection device, characterized in that: include: A data acquisition module and a conditioning output module connected to the data acquisition module; The data acquisition module includes: at least one of a voltage acquisition unit, a current acquisition unit and a temperature acquisition unit; The voltage acquisition unit is used to collect the input voltage of the main control board; The current acquisition unit is used to collect the input current of the main control board and the input current from the main control board to the frequency conversion board; The temperature collection unit is used to collect the temperature of the refrigeration components; The conditioning output module is used to convert the parameters collected by the data acquisition module into voltage for output; Wherein, the voltage acquisition unit is an AC voltage sensor, and the conditioning output module is an AC voltage detection and conditioning unit connected to the AC voltage sensor; the AC voltage sensor is used to collect the input AC voltage and convert the input AC voltage into a low voltage signal; the AC voltage detection and conditioning unit is used to extract the voltage peak value in the voltage signal and output it; The AC voltage detection and conditioning unit comprises: a first-order filter circuit, a peak detection circuit, a second-order filter circuit and a polarity protection circuit connected in sequence; The first-order filter circuit is used to filter out noise interference in the power grid; The peak detection circuit is used to track and detect the peak value of the signal output by the first-order filtering circuit; The second-order filtering circuit is used to perform secondary filtering on the output signal of the peak detection circuit; The polarity protection circuit is used to limit the output signal of the secondary filtering; The current acquisition unit is an AC current sensor, and the conditioning output module is an AC voltage detection conditioning unit connected to the AC current sensor; The AC current sensor is used to collect input current and convert the input AC current into a low-voltage signal; The AC voltage detection and conditioning unit is used to extract the voltage peak value in the voltage signal and output it; The temperature acquisition unit is a temperature sensor, and the conditioning output module is a temperature conditioning unit connected to the temperature sensor; The temperature sensor is used to collect input temperature information and convert the input temperature information into a resistance signal; The temperature conditioning unit is used to convert the resistance signal into a voltage signal and output it; The temperature conditioning unit specifically includes: a matching voltage divider circuit and a filter circuit connected in sequence; The voltage divider circuit is used to connect the received resistance signal in series with a preset resistance to divide the preset voltage and convert it into a voltage transfer output signal; The filter circuit is used to filter the voltage transfer output signal to produce a voltage signal and output it.

2. The refrigerator parameter collection device according to claim 1, characterized in that: The current acquisition unit includes two AC current sensors, which are AC current sensor S2 and AC current sensor S6; Among them, the AC current sensor S2 is arranged at the 220V power input of the main control board, and is used to collect the input current of the main control board and convert the input AC current into a low-voltage signal; the AC current sensor S6 is arranged at the power supply output end of the main control board to the frequency conversion board, and is used to collect the input current from the main control board to the frequency conversion board and convert the input AC current into a low-voltage signal.

3. The refrigerator parameter collection device according to claim 1, characterized in that: The input voltage collected by the voltage collection unit is V X Indicates that the first output voltage V after the conditioning output module 01 It is expressed as:

4. The refrigerator parameter collection device according to claim 1, characterized in that: The input current collected by the current collection unit is I X The second output voltage V after the conditioning output module is 02 Expressed as: V 02 =3.535I X .

5. The refrigerator parameter collection device according to claim 1, characterized in that: The temperature sensors are configured in three, namely, temperature sensor S3, temperature sensor S4 and temperature sensor S5; Among them, the temperature sensor S3 is arranged at the inlet of the refrigerated evaporator, used to collect the temperature information input at the inlet of the refrigerated evaporator and convert the input temperature information into a resistance signal; the temperature sensor S4 is arranged at the outlet of the compressor, used to collect the temperature information input at the outlet of the compressor and convert the input temperature information into a resistance signal; the temperature sensor S5 is arranged at the inlet of the frozen evaporator, used to collect the temperature information input at the inlet of the frozen evaporator and convert the input temperature information into a resistance signal.

6. The refrigerator parameter collection device according to claim 1, characterized in that: The input resistance collected by the temperature acquisition unit is R T The third output voltage V after the conditioning output module is 03 It is expressed as: Wherein, R1 represents a preset resistor.

7. The refrigerator parameter collection device according to claim 1, characterized in that: The temperature sensor is a thermal resistor.

Images