Reference voltage conversion module for air conditioner and air conditioner

Abstract

The invention provides a reference voltage conversion module for an air conditioner and the air conditioner. The reference voltage conversion module comprises: a pulse width modulation circuit having a modulation output end; the first conversion circuit is electrically connected with the modulation output end and is configured to provide reference voltage for the low-current driving circuit; the second conversion circuit and the first conversion circuit are arranged in parallel; the second conversion circuit is electrically connected with the modulation output end and is configured to provide reference voltage for the large-current driving circuit. Due to the fact that the first conversion circuit and the second conversion circuit are arranged, corresponding conversion circuits can be selected according to different driving circuits, when the driving board is matched with expansion valves of different driving types, voltage type (small current) driving and current type (large current) driving can be achieved at the same time, and practicability is remarkably improved. For the first conversion circuit, PWM and Vref have a good linear relationship, so that all expansion valves do not need to be tested, and the cost can be remarkably reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioner control, and particularly to a reference voltage conversion module for an air conditioner and an air conditioner. Background Art

[0002] For the expansion valve drive board of the current air conditioner, the following problems usually exist: the drive current for outputting the reference voltage cannot take into account both a large current of several hundred milliamperes and a small current of several milliamperes, which will cause the drive board to be unable to take into account both voltage type (small current) drive and current type (large current) drive when matching different types of expansion valves. In addition, when the PWM (Pulse Width Modulation) circuit converts to Vref (reference voltage), the linearity of the reference level is poor, which will cause the software of the drive board to be unable to write logic code according to the formula when matching different models of expansion valves. Instead, it can only summarize the test results in a table after testing each expansion valve model, and drive each model of expansion valve according to the table. That is to say, all expansion valves need to be tested and then tabulated, resulting in a relatively high cost. Summary of the Invention

[0003] In view of the above problems, the present invention is proposed to provide a reference voltage conversion module for an air conditioner and an air conditioner that can overcome or at least partially solve the above problems, which can simultaneously match voltage type (small current) drive and current type (large current) drive, and has strong practicability; and it is not necessary to test all expansion valves to reduce costs.

[0004] Specifically, the present invention provides a reference voltage conversion module for an air conditioner, which includes:

[0005] A pulse width modulation circuit, which has a modulation output terminal;

[0006] A first conversion circuit, which is configured to be electrically connected to the modulation output terminal and configured to provide a reference voltage to a small current drive circuit;

[0007] A second conversion circuit, which is configured to be arranged in parallel with the first conversion circuit; the second conversion circuit is electrically connected to the modulation output terminal and configured to provide a reference voltage to a large current drive circuit.

[0008] Optionally, the first conversion circuit includes:

[0009] A first charge and discharge unit, which has a first resistor and a first non-polar capacitor. The first end of the first resistor is electrically connected to the output terminal of the first conversion circuit; the first end of the first non-polar capacitor is electrically coupled to the first end of the first resistor; the second end of the first non-polar capacitor is grounded;

[0010] A first switching unit, an input end of the first switching unit is electrically connected to the modulation output end, and an output end of the first switching unit is electrically connected to a second end of the first resistor; the first switching unit is configured to control a charge and discharge state of the first charge and discharge unit according to a signal of the modulation output end;

[0011] A first voltage source, the first voltage source is electrically connected to the first charge and discharge unit through the first switching unit to supply power to the first charge and discharge unit under the control of the first switching unit, so that the first charge and discharge unit is charged.

[0012] Optionally, the first switching unit includes:

[0013] A first N-type transistor, a base of the first N-type transistor serves as the input end of the first switching unit and is electrically connected to the modulation output end, a collector of the first N-type transistor is electrically connected to the first voltage source, and an emitter of the first N-type transistor is grounded;

[0014] A second N-type transistor, a base of the second N-type transistor is electrically coupled to the collector of the first N-type transistor, a collector of the second N-type transistor is electrically connected to the first voltage source, and an emitter of the second N-type transistor serves as the output end of the first switching unit;

[0015] A P-type transistor, a base of the P-type transistor is electrically coupled to the collector of the first N-type transistor, a collector of the P-type transistor is electrically coupled to the emitter of the second N-type transistor, and an emitter of the P-type transistor is grounded.

[0016] Optionally, a second resistor is disposed between the base of the first N-type transistor and the modulation output end;

[0017] A third resistor is disposed between the collector of the first N-type transistor and the first voltage source;

[0018] A fourth resistor is disposed between the base of the second N-type transistor and the collector of the first N-type transistor.

[0019] Optionally, the first conversion circuit further includes:

[0020] A second charge and discharge unit, which has a fifth resistor and a second non-polar capacitor, a first end of the fifth resistor is electrically coupled to the second end of the first resistor, a second end of the fifth resistor is electrically connected to the output end of the first switching unit; a first end of the second non-polar capacitor is electrically coupled to the second end of the fifth resistor; a second end of the second non-polar capacitor is grounded;

[0021] A sixth resistor, a first end of the sixth resistor being electrically coupled to a first end of the first resistor;

[0022] A seventh resistor, a first end of the seventh resistor being electrically coupled to a second end of the sixth resistor, and a second end serving as an output end of the first conversion circuit;

[0023] An eighth resistor, a first end of the eighth resistor being electrically coupled to a second end of the sixth resistor, and a second end being grounded;

[0024] At least one first filter capacitor circuit, a first end of each first filter capacitor circuit being electrically coupled to a second end of the seventh resistor, and a second end being grounded.

[0025] Optionally, the second conversion circuit includes:

[0026] A third charge and discharge unit having an inductor, a polarized capacitor, and a ninth resistor, a first end of the inductor being electrically connected to an output end of the second conversion circuit; a positive electrode end of the polarized capacitor being electrically coupled to the first end of the inductor; a negative electrode end of the polarized capacitor being grounded; a first end of the ninth resistor being electrically coupled to a second end of the inductor; and a second end of the ninth resistor being grounded;

[0027] A second switch unit, an input end of the second switch unit being electrically connected to the modulation output end, and an output end of the second switch unit being electrically connected to the second end of the inductor; the second switch unit being configured to control a charge and discharge state of the third charge and discharge unit according to a signal at the modulation output end;

[0028] A second voltage source, the second voltage source being electrically connected to the third charge and discharge unit through the second switch unit to supply power to the third charge and discharge unit under the control of the second switch unit so that the third charge and discharge unit is charged.

[0029] Optionally, the second switch unit includes:

[0030] A third N-type triode, a base of the third N-type triode serving as an input end of the second switch unit and being electrically connected to the modulation output end, a collector of the third N-type triode being electrically connected to the second voltage source, and an emitter of the third N-type triode being grounded;

[0031] An NMOS transistor, a gate of the NMOS transistor being electrically coupled to the collector of the third N-type triode, a drain of the NMOS transistor being electrically connected to the second voltage source, and a source of the NMOS transistor being grounded; a drain of the NMOS transistor serving as an output end of the second switch unit.

[0032] Optionally, a tenth resistor is provided between the base of the third N-type triode and the modulation output end;

[0033] The gate of the NMOS transistor and the collector of the third N-type transistor are provided with an eleventh resistor;

[0034] The gate of the NMOS transistor is grounded through a twelfth resistor;

[0035] A thirteenth resistor is provided between the drain of the NMOS transistor and the second voltage source.

[0036] Optionally, the second conversion circuit further includes:

[0037] A fourteenth resistor, the first end of the fourteenth resistor is electrically coupled to the first end of the inductor, and the second end serves as the output end of the second conversion circuit;

[0038] A second filter capacitor circuit, the first end of the second filter capacitor circuit is electrically coupled to the second end of the fourteenth resistor, and the second end is grounded.

[0039] The present invention also provides an air conditioner, which includes:

[0040] A control device, the control device has any one of the above reference voltage conversion modules, and the control device is configured to controllably conduct the modulation output end with one of the first conversion circuit and the second conversion circuit;

[0041] A driven device, the reference voltage terminal of the driven device is electrically connected to the output end of the corresponding first conversion circuit or the output end of the second conversion circuit; or,

[0042] The present invention also provides another air conditioner, which includes:

[0043] A control device, the control device has any one of the above reference voltage conversion modules;

[0044] A driven device, the reference voltage terminal of the driven device is electrically connected to the output end of the corresponding first conversion circuit or the output end of the second conversion circuit, and the corresponding first conversion circuit or the second conversion circuit is electrically connected to the modulation output end.

[0045] In the reference voltage conversion module and the air conditioner of the present invention, due to the presence of the first conversion circuit and the second conversion circuit, the corresponding conversion circuit can be selected according to different drive circuits. In this way, when the drive board matches expansion valves of different drive types, it can take into account both voltage-type (small current) drive and current-type (large current) drive, significantly improving the practicality.

[0046] Furthermore, in the reference voltage conversion module and the air conditioner of the present invention, for the first conversion circuit, there is a good linear relationship between PWM and Vref. In this way, it is not necessary to test all expansion valves. It is only necessary to make a table for some expansion valves and form the linear relationship between PWM and Vref, which can significantly reduce costs.

[0047] From the following detailed description of specific embodiments of the present invention in conjunction with the drawings, those skilled in the art will become more clearly aware of the above and other objects, advantages and features of the present invention. Description of the Drawings

[0048] Some specific embodiments of the present invention will be described in detail hereinafter with reference to the drawings in an exemplary but non-limiting manner. The same reference numerals in the drawings denote the same or similar components or parts. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0049] Figure 1 is a schematic diagram of a reference voltage conversion module according to an embodiment of the present invention;

[0050] Figure 2 is a schematic diagram of a first conversion circuit in a reference voltage conversion module according to an embodiment of the present invention;

[0051] Figure 3 is a schematic diagram of a second conversion circuit in a reference voltage conversion module according to an embodiment of the present invention;

[0052] Figure 4 is a schematic diagram of the relationship between PWM and Vref during conversion by the first conversion circuit in a reference voltage conversion module according to an embodiment of the present invention;

[0053] Figure 5 is a schematic diagram of the relationship between PWM and Vref during conversion by the second conversion circuit in a reference voltage conversion module according to an embodiment of the present invention.

[0054] In the drawings:

[0055] 100. Reference voltage conversion module; 10. First conversion circuit; 11. First voltage source; 12. First resistor; 13. First non-polar capacitor; 14. First N-type triode; 15. Second N-type triode; 16. P-type triode; 17. Second resistor; 18. Third resistor; 19. Fourth resistor; 21. Fifth resistor; 22. Second non-polar capacitor; 23. Sixth resistor; 24. Seventh resistor; 25. Eighth resistor; 26. First filter capacitor circuit; 30. Pulse width modulation circuit; 40. Second conversion circuit; 41. Thermistor; 42. Inductor; 43. Polar capacitor; 44. Ninth resistor; 45. Third N-type triode; 46. NMOS transistor; 47. Tenth resistor; 48. Eleventh resistor; 49. Twelfth resistor; 51. Thirteenth resistor; 52. Fourteenth resistor; 53. Second filter capacitor circuit. Detailed implementation manner

[0056] The following will refer to Figures 1 to 5 to describe the reference voltage conversion module for an air conditioner and the air conditioner according to an embodiment of the present invention. In the description of this embodiment, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features, that is, including one or more of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined. When a certain feature "includes or contains" a certain or certain features it covers, unless otherwise specifically described, this indicates that other features are not excluded and other features may be further included.

[0057] Unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "connected", "fixed", "coupled", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. Those of ordinary skill in the art should be able to understand the specific meanings of the above terms in the present invention according to specific circumstances.

[0058] In addition, in the description of this embodiment, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. That is, in the description of this embodiment, the first feature being "above", "over", and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath", or "underneath" the second feature may be the first feature being directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0059] In the description of this embodiment, the description referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

[0060] Figure 1 is a schematic diagram of a temperature acquisition device according to an embodiment of the present invention, as Figure 1 shown and referring to Figures 2 to 5 , an embodiment of the present invention provides a reference voltage conversion module 100 for an air conditioner, which includes a pulse width modulation circuit 30, a first conversion circuit 10, and a second conversion circuit 40.

[0061] The pulse width modulation (PWM) circuit has a modulation output terminal. The specific working principle of the PWM circuit is to equivalently obtain the required waveform (including shape and amplitude) by modulating the width of a series of pulses. Specifically, first, a clock signal with a fixed frequency (usually a square wave or a sine wave) is utilized, and then by changing the duty cycle of this clock signal (i.e., the proportion of the high level), different analog signal outputs are generated. The modulation output terminal is used to output the required waveform.

[0062] The first conversion circuit 10 is configured to be electrically connected to the modulation output terminal and configured to provide a reference voltage to the small current drive circuit. The second conversion circuit 40 is configured to be arranged in parallel with the first conversion circuit 10. The second conversion circuit 40 is configured to be electrically connected to the modulation output terminal and configured to provide a reference voltage to the large current drive circuit.

[0063] The small current drive circuit is a circuit on a device that requires a voltage type (small current) drive. The large current drive circuit is a circuit on a device that requires a current type (large current) drive. The first conversion circuit 10 is dedicated to the small current drive circuit. The second conversion circuit 40 is dedicated to the large current drive circuit. Since there are the first conversion circuit 10 and the second conversion circuit 40, the corresponding conversion circuit can be selected according to different drive circuits. In this way, when the drive board matches expansion valves of different drive types, it can be matched with both voltage type (small current) drive and current type (large current) drive, which significantly improves practicality.

[0064] In some embodiments of the present invention, Figure 2 As shown, the first conversion circuit 10 includes a first charge and discharge unit, a first switch unit and a first voltage source 11. The first charge and discharge unit has a first resistor 12 and a first non-polar capacitor 13. The first end of the first resistor 12 is electrically connected to the output end of the first conversion circuit 10. The first end of the first non-polar capacitor 13 is electrically coupled to the first end of the first resistor 12. The second end of the first non-polar capacitor 13 is grounded. The input end of the first switch unit is electrically connected to the modulation output end, and the output end of the first switch unit is electrically connected to the second end of the first resistor 12. The first switch unit is configured to control the charge and discharge state of the first charge and discharge unit according to the signal of the modulation output end. The first voltage source 11 is electrically connected to the first charge and discharge unit through the first switch unit to supply power to the first charge and discharge unit under the control of the first switch unit so that the first charge and discharge unit is charged.

[0065] In the embodiment of the present invention, the first conversion circuit 10 is powered by the first voltage source 11, and the first switch unit controls the charge and discharge state of the first charge and discharge unit, so that the first charge and discharge unit outputs a stable reference voltage that meets the use requirements.

[0066] In some embodiments of the present invention, the first switch unit includes a first N-type transistor 14, a second N-type transistor 15 and a P-type transistor 16. The base of the first N-type transistor 14 is the input terminal of the first switch unit and is electrically connected to the modulation output terminal. The collector of the first N-type transistor 14 is electrically connected to the first voltage source 11, and the emitter of the first N-type transistor 14 is grounded. The base of the second N-type transistor 15 is electrically coupled to the collector of the first N-type transistor 14, the collector of the second N-type transistor 15 is electrically connected to the first voltage source 11, and the emitter of the second N-type transistor 15 serves as the output terminal of the first switch unit. The base of the P-type transistor 16 is electrically coupled to the collector of the first N-type transistor 14, the collector of the P-type transistor 16 is electrically coupled to the emitter of the second N-type transistor 15, and the emitter of the P-type transistor 16 is grounded.

[0067] In the embodiment of the present invention, by providing a first N-type transistor 14, a second N-type transistor 15, and a P-type transistor 16, these three transistors can simply and conveniently control the charge and discharge states of the first charge and discharge unit, so that the first charge and discharge unit generates a stable reference voltage that meets the requirements according to the signal output by the pulse width modulation circuit 30, which is particularly suitable for a small current drive circuit.

[0068] In some embodiments of the present invention, a second resistor 17 is provided between the base of the first N-type transistor 14 and the modulation output terminal. A third resistor 18 is provided between the collector of the first N-type transistor 14 and the first voltage source 11. A fourth resistor 19 is provided between the base of the second N-type transistor 15 and the collector of the first N-type transistor 14. The second resistor 17, the third resistor 18, and the fourth resistor 19 can protect the circuit.

[0069] In some embodiments of the present invention, the first conversion circuit 10 further includes a second charge and discharge unit. The second charge and discharge unit has a fifth resistor 21 and a second non-polar capacitor 22. The first end of the fifth resistor 21 is electrically coupled to the second end of the first resistor 12. The second end of the fifth resistor 21 is electrically connected to the output terminal of the first switch unit. The first end of the second non-polar capacitor 22 is electrically coupled to the second end of the fifth resistor 21. The second end of the second non-polar capacitor 22 is grounded. In the embodiment of the present invention, by providing the second charge and discharge unit, the reference voltage is further made more stable.

[0070] In some embodiments of the present invention, the first conversion circuit 10 further includes a sixth resistor 23, a seventh resistor 24, an eighth resistor 25, and at least one first filter capacitor circuit 26. The first end of the sixth resistor 23 is electrically coupled to the first end of the first resistor 12. The first end of the seventh resistor 24 is electrically coupled to the second end of the sixth resistor 23, and the second end serves as the output terminal of the first conversion circuit 10. The first end of the eighth resistor 25 is electrically coupled to the second end of the sixth resistor 23, and the second end is grounded. The first end of each first filter capacitor circuit 26 is electrically coupled to the second end of the seventh resistor 24, and the second end is grounded.

[0071] In some embodiments of the present invention, when the first conversion circuit 10 is operating, by switching the first N-type transistor 14, the switching of the second N-type transistor 15 and the P-type transistor 16 is controlled, and through RC filtering, the output of different Vref voltage values is achieved. The action logic within one cycle of PWM: When the first N-type transistor 14 is turned off, the fourth resistor is at a high level, and the Vb of the second N-type transistor 15 e is greater than the turn-on voltage, and the second N-type transistor 15 is in a conducting state. Through the first resistor 12 and the fifth resistor 21, the non-polar capacitor is charged, and the terminal voltage rises. When the first N-type transistor 14 is turned on, the fourth resistor is at a low level, and the Vb of the second N-type transistor 15 eThe voltage is less than 0, the second N-type triode 15 is in the off state, and the Vb of the P-type triode 16 e is greater than the turn-on voltage, the P-type triode 16 conducts, the non-polar capacitor is in the discharge state, and the terminal voltage of the non-polar capacitor decreases. After RC filtering, a stable Vref is output.

[0072] In some embodiments of the present invention, when designing the first conversion circuit 10, a PWM output adjustable reference voltage value is designed, and there is a linear relationship between the PWM input and Vref. Then, according to the statistics of simulation data and measured data, a linear correspondence relationship is found, such as Figure 4 shown. According to different duty cycles, different linear gradient current values can be driven, up to 450 mA at most. When in use, the linear relationship can be used to set the air conditioner. During experiments, the driving chip STSPIN820 can be connected, and the sampling resistor is selected to be 0.375 Ω. Theoretically, the driving current range corresponding to the Vref voltage value range is 0 - 565.68 mA, with a wide driving range, which can meet the driven devices with different current value drives, such as expansion valves. The relationship between PWM and Vref is shown in the following table.

[0073] PWM duty cycle Simulated value / mV Actual value / mV 0％ 0.887 5％ 40.674 10％ 72.692 65.54 15％ 89.272 20％ 104.21 25％ 117.535 30％ 131.409 125.8 35％ 144.494 40％ 158.129 159.2 45％ 171.821 50％ 185.327 187.6 55％ 197.769 60％ 209.705 65％ 221.964 70％ 233.161 759％ 245.495 80％ 257.099 263.6 85％ 268.687 90％ 280.659 95％ 292.246 100％ 303.913 319.7

[0074] In some embodiments of the present invention, as Figure 3 shown, the second conversion circuit 40 includes a third charge and discharge unit, a second switch unit, and a second voltage source 41. The third charge and discharge unit has an inductor 42, a polar capacitor 43, and a ninth resistor 44. The first end of the inductor 42 is electrically connected to the output end of the second conversion circuit 40. The positive end of the polar capacitor 43 is electrically coupled to the first end of the inductor 42. The negative end of the polar capacitor 43 is grounded. The first end of the ninth resistor 44 is electrically coupled to the second end of the inductor 42. The second end of the ninth resistor 44 is grounded. The input end of the second switch unit is electrically connected to the modulation output end, and the output end of the second switch unit is electrically connected to the second end of the inductor 42. The second switch unit is configured to control the charge and discharge state of the third charge and discharge unit according to the signal of the modulation output end. The second voltage source 41 is electrically connected to the third charge and discharge unit through the second switch unit, and supplies power to the third charge and discharge unit under the control of the second switch unit to make the third charge and discharge unit charge.

[0075] In the embodiments of the present invention, the second conversion circuit 40 is powered by the second voltage source 41, and the second switch unit controls the charge and discharge state of the third charge and discharge unit, so that the third charge and discharge unit outputs a stable reference voltage that meets the use requirements. And the settings of the inductor 42, the polar capacitor 43, and the ninth resistor 44 can fully meet the requirements of high-current drive.

[0076] In some embodiments of the present invention, the second switching unit includes a third N-type transistor 45 and an NMOS transistor 46. The base of the third N-type transistor 45 serves as the input end of the second switching unit and is electrically connected to the modulation output end. The collector of the third N-type transistor 45 is electrically connected to the second voltage source 41, and the emitter of the third N-type transistor 45 is grounded. The gate of the NMOS transistor 46 is electrically coupled to the collector of the third N-type transistor 45. The drain of the NMOS transistor 46 is electrically connected to the second voltage source 41, and the source of the NMOS transistor 46 is grounded. The drain of the NMOS transistor 46 serves as the output end of the second switching unit. By providing the third N-type transistor 45 and the NMOS transistor 46, the charge and discharge state of the third charge and discharge unit can be simply and conveniently controlled, so that the third charge and discharge unit generates a stable reference voltage that meets the requirements according to the signal output by the pulse width modulation circuit 30, which is particularly suitable for high-current drive circuits.

[0077] In some embodiments of the present invention, a tenth resistor 47 is provided between the base of the third N-type transistor 45 and the modulation output end. An eleventh resistor 48 is provided between the gate of the NMOS transistor 46 and the collector of the third N-type transistor 45. The gate of the NMOS transistor 46 is grounded through a twelfth resistor 49. A thirteenth resistor 51 is provided between the drain of the NMOS transistor 46 and the second voltage source 41.

[0078] In some embodiments of the present invention, the second conversion circuit 40 further includes a fourteenth resistor 52 and a second filter capacitor circuit 53. The first end of the fourteenth resistor 52 is electrically coupled to the first end of the inductor 42, and the second end serves as the output end of the second conversion circuit 40. The first end of the second filter capacitor circuit 53 is electrically coupled to the second end of the fourteenth resistor 52, and the second end is grounded.

[0079] In some embodiments of the present invention, by switching the third N-type transistor 45, the switching of the NMOS transistor 46 is controlled, and through LC filtering, different Vref voltage values are output. The action logic within one period of PWM is as follows: when the third N-type transistor 45 is turned off, the eleventh resistor 48 is at a high level, the Vgs of the NMOS transistor 46 is greater than the turn-on voltage, and the NMOS transistor 46 is in a conducting state. The polar capacitor 43 starts to discharge through the inductor 42, and the terminal voltage decreases; when the third N-type transistor 45 is turned on, the eleventh resistor 48 is at a low level, the Vgs voltage of the NMOS transistor 46 is equal to 0, the NMOS transistor 46 is in a turned-off state, and the polar capacitor 43 is in a charging state, and the terminal voltage increases.

[0080] In some embodiments of the present invention, when designing the second conversion circuit 40, a tunable reference voltage value for the PWM output is designed. According to the statistical analysis of the simulation data and the measured data, a polynomial fitting curve correspondence is found, such as Figure 5As shown. During use, the air conditioner can be set according to the fitted curve. For example, according to the selected type of the inductor 42 with a specification of 1.5 A, the driving of a driven device with a maximum of 1.5 A can be achieved. The relationship between PWM and Vref is shown in the following table.

[0081] PWM duty cycle Measured value Simulated value 0 0.027 0.0343 5 0.029 0.0335 10 0.031 0.0351 20 0.035 0.04 30 0.04 0.0462 40 0.045 0.055 50 0.055 0.0679 60 0.067 0.0846 70 0.088 0.1026 80 0.125 0.1459 85 0.158 0.1841 90 0.217 0.248 95 0.343 0.3759 100 0.765 0.7576

[0082] An embodiment of the present invention also provides an air conditioner, which includes a control device and a driven device. The control device has the reference voltage conversion module in any of the above embodiments, and the control device is configured to controllably conduct the modulation output terminal to one of the first conversion circuit 10 and the second conversion circuit 40. That is to say, switches can be arranged between the modulation output terminal and the first conversion circuit 10 and the second conversion circuit 40, and the corresponding conversion circuit is conducted according to needs. The reference voltage terminal of the driven device is electrically connected to the output terminal of the corresponding first conversion circuit 10 or the output terminal of the second conversion circuit 40. According to the driving type of the driven device, it is then connected to the corresponding conversion circuit. For example, when an expansion valve that requires high-current driving is externally connected, the second conversion circuit 40 is selected; when a voltage-type driving expansion valve is externally connected, the first conversion circuit 10 is selected.

[0083] In some embodiments of the present utility model, during the assembly of the air conditioner, the reference voltage terminal of the driven device is directly electrically connected to the output terminal of the corresponding first conversion circuit 10 or the output terminal of the second conversion circuit 40, and the corresponding first conversion circuit 10 or the second conversion circuit 40 is electrically connected to the modulation output terminal. In this way, the air conditioner does not need to make on-off selections during operation.

[0084] In some embodiments of the present invention, the driven device can be different devices, such as different types of expansion valves, fan motors, water pumps, etc. The main device driven is the stepper motor on these devices. Through the control device of the embodiment of the present invention, the control device can be a driving chip, etc. There is no need to set a dedicated driving chip for each device. The control device of the embodiment of the present invention has versatility and can meet any of the above devices, enabling mass production and significantly reducing costs.

[0085] At this point, those skilled in the art should recognize that although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived from the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all these other variations or modifications.

Claims

1. A reference voltage conversion module for an air conditioner, characterized in that, Comprising: A pulse width modulation circuit having a modulation output terminal; A first conversion circuit configured to be electrically connected to the modulation output terminal and configured to provide a reference voltage to a small current drive circuit; A second conversion circuit configured to be electrically connected to the modulation output terminal and configured to provide a reference voltage to a large current drive circuit.

2. The reference voltage conversion module according to claim 1, characterized in that The first conversion circuit includes: A first charge and discharge unit having a first resistor and a first non-polar capacitor. A first end of the first resistor is electrically connected to an output terminal of the first conversion circuit; a first end of the first non-polar capacitor is electrically coupled to the first end of the first resistor; a second end of the first non-polar capacitor is grounded; A first switch unit. An input end of the first switch unit is electrically connected to the modulation output terminal, and an output end of the first switch unit is electrically connected to a second end of the first resistor. The first switch unit is configured to control a charge and discharge state of the first charge and discharge unit according to a signal of the modulation output terminal; A first voltage source electrically connected to the first charge and discharge unit through the first switch unit to supply power to the first charge and discharge unit under the control of the first switch unit so that the first charge and discharge unit is charged.

3. The reference voltage conversion module according to claim 2, characterized in that The first switch unit includes: A first N-type transistor. A base of the first N-type transistor serves as an input end of the first switch unit and is electrically connected to the modulation output terminal. A collector of the first N-type transistor is electrically connected to the first voltage source. An emitter of the first N-type transistor is grounded; A second N-type transistor. A base of the second N-type transistor is electrically coupled to a collector of the first N-type transistor. A collector of the second N-type transistor is electrically connected to the first voltage source. An emitter of the second N-type transistor serves as an output end of the first switch unit; A P-type transistor. A base of the P-type transistor is electrically coupled to a collector of the first N-type transistor. A collector of the P-type transistor is electrically coupled to an emitter of the second N-type transistor. An emitter of the P-type transistor is grounded.

4. The reference voltage conversion module according to claim 3, wherein A second resistor is provided between the base of the first N-type transistor and the modulation output terminal; A third resistor is provided between the collector of the first N-type transistor and the first voltage source; A fourth resistor is provided between the base of the second N-type transistor and the collector of the first N-type transistor.

5. The reference voltage conversion module according to claim 2, wherein The first conversion circuit further includes: A second charge and discharge unit having a fifth resistor and a second non-polar capacitor. A first end of the fifth resistor is electrically coupled to a second end of the first resistor, and a second end of the fifth resistor is electrically connected to an output end of the first switch unit; a first end of the second non-polar capacitor is electrically coupled to the second end of the fifth resistor; a second end of the second non-polar capacitor is grounded; A sixth resistor. A first end of the sixth resistor is electrically coupled to a first end of the first resistor; A seventh resistor, a first end of the seventh resistor is electrically coupled to a second end of the sixth resistor, and a second end serves as an output end of the first conversion circuit; An eighth resistor, a first end of the eighth resistor is electrically coupled to a second end of the sixth resistor, and a second end is grounded; At least one first filter capacitor circuit, a first end of each first filter capacitor circuit is electrically coupled to a second end of the seventh resistor, and a second end is grounded.

6. The reference voltage conversion module according to claim 1, wherein The second conversion circuit includes: A third charge and discharge unit having an inductor, a polarized capacitor, and a ninth resistor. A first end of the inductor is electrically connected to an output end of the second conversion circuit; a positive electrode of the polarized capacitor is electrically coupled to the first end of the inductor; a negative electrode of the polarized capacitor is grounded; a first end of the ninth resistor is electrically coupled to a second end of the inductor; a second end of the ninth resistor is grounded; A second switch unit, an input end of the second switch unit is electrically connected to the modulation output end, and an output end of the second switch unit is electrically connected to the second end of the inductor; the second switch unit is configured to control a charge and discharge state of the third charge and discharge unit according to a signal at the modulation output end; A second voltage source, the second voltage source is electrically connected to the third charge and discharge unit through the second switch unit to supply power to the third charge and discharge unit under the control of the second switch unit so that the third charge and discharge unit is charged.

7. The reference voltage conversion module according to claim 6, wherein The second switch unit includes: A third N-type transistor, a base of the third N-type transistor serves as an input end of the second switch unit and is electrically connected to the modulation output end, a collector of the third N-type transistor is electrically connected to the second voltage source, and an emitter of the third N-type transistor is grounded; An NMOS transistor, a gate of the NMOS transistor is electrically coupled to a collector of the third N-type transistor, a drain of the NMOS transistor is electrically connected to the second voltage source, and a source of the NMOS transistor is grounded; a drain of the NMOS transistor serves as an output end of the second switch unit.

8. The reference voltage conversion module according to claim 7, wherein A tenth resistor is provided between a base of the third N-type transistor and the modulation output end; An eleventh resistor is provided between a gate of the NMOS transistor and a collector of the third N-type transistor; The gate of the NMOS transistor is grounded through a twelfth resistor; A thirteenth resistor is provided between a drain of the NMOS transistor and the second voltage source.

9. The reference voltage conversion module according to claim 6, wherein The second conversion circuit further includes: A fourteenth resistor, a first end of the fourteenth resistor is electrically coupled to a first end of the inductor, and a second end serves as an output end of the second conversion circuit; A second filter capacitor circuit, a first end of the second filter capacitor circuit is electrically coupled to a second end of the fourteenth resistor, and a second end is grounded.

10. An air conditioner, characterized in that, Includes: A control device having the reference voltage conversion module according to any one of claims 1 to 9, and the control device is configured to controllably conduct the modulation output end with one of the first conversion circuit and the second conversion circuit; A driven device, wherein a reference voltage terminal of the driven device is electrically connected to an output terminal of the corresponding first conversion circuit or an output terminal of the second conversion circuit; Or, The air conditioner includes: A control device having a reference voltage conversion module as described in any one of claims 1 to 9; A driven device, wherein a reference voltage terminal of the driven device is electrically connected to an output terminal of the corresponding first conversion circuit or an output terminal of the second conversion circuit, and the corresponding first conversion circuit or the second conversion circuit is electrically connected to the modulation output terminal.

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