Control method of power supply circuit of air conditioner, power supply circuit and air conditioner

Abstract

The invention discloses a power supply circuit, a control method and an operation control device of an air conditioner, the air conditioner and a computer readable storage medium, the power supply circuit comprises a relay, and an alternating current input end, a thermistor, a rectifier module and a direct current output end which are connected in sequence, and a switch contact of the relay is connected with the thermistor in parallel; the control method comprises the following steps: acquiring an operation parameter representing the loss condition of the thermistor; and when the operation parameters meet the preset conditions, the relay is controlled to act, so that the switch contact performs short circuit on the thermistor. When the power supply circuit is powered on for operation, operation parameters representing the loss condition of the thermistor are obtained, when the operation parameters meet preset conditions, it is indicated that the loss of the thermistor is large, the relay is controlled to act, and the thermistor is short-circuited through a switch contact of the relay; therefore, loss caused by the fact that large operation current flows through the thermistor is reduced, loss of the power supply circuit can be reduced, and efficiency of the power supply circuit is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning circuits, and in particular to a control method for a power supply circuit of an air conditioner, a power supply circuit of the air conditioner, an operation control device, an air conditioner, and a computer-readable storage medium. Background Art

[0002] The power circuit of the air conditioner generally contains a large-capacity capacitor. When the air conditioner is powered on, the input power will charge the capacitor. At the moment of powering on, the capacitor is like a short circuit, which will cause a very large input current, causing subsequent circuit components to be damaged due to current overshoot.

[0003] At present, the power circuit of the air conditioner generally uses thermistors to limit the input current and reduce the impact of current surge. However, thermistors have a large resistance, and the normal operation of the subsequent circuit will produce a large circuit loss, resulting in low efficiency of the power circuit. Summary of the invention

[0004] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art, and to provide a control method for the power circuit of an air conditioner, a power circuit of an air conditioner, an operation control device, an air conditioner and a computer-readable storage medium, which can reduce the power circuit loss and effectively improve the efficiency of the power circuit.

[0005] In a first aspect, an embodiment of the present invention provides a method for controlling a power circuit of an air conditioner, wherein the power circuit comprises a relay and an AC input terminal, a thermistor, a rectifier module, and a DC output terminal connected in sequence, wherein a switch contact of the relay is connected in parallel with the thermistor, and the method comprises:

[0006] Obtaining an operating parameter characterizing a loss condition of the thermistor;

[0007] When the operating parameter meets the preset condition, the relay is controlled to operate so that the switch contact short-circuits the thermistor.

[0008] The control method of the power supply circuit of the air conditioner provided by the embodiment of the present invention has at least the following beneficial effects: the power supply circuit is provided with a relay and the switch contact of the relay is connected in parallel with the thermistor, so that the thermistor can be short-circuited when the loss of the thermistor is large; when the power supply circuit is powered on, by obtaining the operating parameters characterizing the loss of the thermistor, when the operating parameters meet the preset conditions, indicating that the loss of the thermistor is large, the relay is controlled to operate so that the switch contact of the relay short-circuits the thermistor, thereby reducing the loss caused by the large operating current flowing through the thermistor, thereby reducing the loss of the power supply circuit and effectively improving the efficiency of the power supply circuit.

[0009] According to the control method of the power supply circuit of the air conditioner provided by some embodiments of the present invention, the DC output end supplies power to multiple loads, and the operating parameter is the load rate of each load when it is operating; the preset condition is: the sum of the load rates of all the loads in operation is greater than a first preset value.

[0010] According to a control method for a power circuit of an air conditioner provided in some embodiments of the present invention, the load includes a fan, the fan is provided with a first wind shield and a second wind shield, the load rate of the fan when operating at the first wind shield is a second preset value, and the load rate of the fan when operating at the second wind shield is a third preset value greater than the second preset value.

[0011] According to the control method of the power supply circuit of the air conditioner provided by some embodiments of the present invention, the load includes a fan, and the load rate of the fan is obtained by converting the measured wind speed.

[0012] According to the control method of the power circuit of the air conditioner provided by some embodiments of the present invention, the load rate of the fan is proportional to the cube of the wind speed.

[0013] According to the control method of the power supply circuit of the air conditioner provided in some embodiments of the present invention, the load further includes at least one of the following:

[0014] Thermal imaging device;

[0015] Swinging wind device;

[0016] Cleaning device.

[0017] According to the control method of the power circuit of the air conditioner provided by some embodiments of the present invention, the operating parameter is a first current value flowing through the thermistor, and the preset condition is: the first current value is greater than a fourth preset value.

[0018] According to the control method of the power circuit of the air conditioner provided by some embodiments of the present invention, the operating parameter is a first current value flowing through the thermistor, and the preset condition is: the thermistor loss converted according to the first current value is greater than a fifth preset value.

[0019] In a second aspect, an embodiment of the present invention provides a power supply circuit of an air conditioner, comprising a relay, a sampling module, a driving optocoupler, and an AC input end, a thermistor, a rectifier module, and a DC output end connected in sequence; the switch contact of the relay is connected in parallel with the thermistor; the sampling module is respectively connected to the thermistor and the driving optocoupler to collect the current flowing through the thermistor; the driving optocoupler is used to output a control signal when the current flowing through the thermistor is greater than a set value to activate the relay.

[0020] The power supply circuit of the air conditioner provided according to the embodiment of the present invention has at least the following beneficial effects: the power supply circuit is provided with a relay and the switch contact of the relay is connected in parallel with the thermistor, so that the thermistor can be short-circuited when the loss of the thermistor is large; when the power supply circuit is powered on, the sampling module collects the current flowing through the thermistor and transmits it to the driving optocoupler. When the collected current flowing through the thermistor is greater than the set value, it indicates that the loss of the thermistor is large, which can make the light-emitting diode on the primary side of the driving optocoupler emit light, and then make the phototransistor on the secondary side of the driving optocoupler conduct, and the driving optocoupler outputs a control signal to make the relay actuate, so that the switch contact of the relay short-circuits the thermistor, thereby reducing the loss caused by the large operating current flowing through the thermistor, thereby reducing the power supply circuit loss and effectively improving the efficiency of the power supply circuit.

[0021] The power supply circuit of the air conditioner provided according to some embodiments of the present invention further includes a switching tube, one switching pin of the switching tube is connected to one end of the coil of the relay, the other end of the coil of the relay is connected to a DC power supply, the other switching pin of the switching tube is grounded, and the control pin of the switching tube is connected to the driving optocoupler.

[0022] In a third aspect, an embodiment of the present invention provides an operation control device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the control method as described in the embodiment of the first aspect above.

[0023] The control method of the power supply circuit of the air conditioner provided by the embodiment of the present invention has at least the following beneficial effects: the power supply circuit is provided with a relay and the switch contact of the relay is connected in parallel with the thermistor, so that the thermistor can be short-circuited when the loss of the thermistor is large; when the power supply circuit is powered on, by obtaining the operating parameters characterizing the loss of the thermistor, when the operating parameters meet the preset conditions, indicating that the loss of the thermistor is large, the relay is controlled to operate so that the switch contact of the relay short-circuits the thermistor, thereby reducing the loss caused by the large operating current flowing through the thermistor, thereby reducing the loss of the power supply circuit and effectively improving the efficiency of the power supply circuit.

[0024] In a fourth aspect, an embodiment of the present invention provides an air conditioner, comprising the power supply circuit as described in the embodiment of the second aspect above, or comprising the operation control device as described in the embodiment of the third aspect above.

[0025] The control method of the power supply circuit of the air conditioner provided by the embodiment of the present invention has at least the following beneficial effects: the power supply circuit is provided with a relay and the switch contact of the relay is connected in parallel with the thermistor, so that the thermistor can be short-circuited when the loss of the thermistor is large; when the power supply circuit is powered on, by obtaining the operating parameters characterizing the loss of the thermistor, when the operating parameters meet the preset conditions, indicating that the loss of the thermistor is large, the relay is controlled to operate so that the switch contact of the relay short-circuits the thermistor, thereby reducing the loss caused by the large operating current flowing through the thermistor, thereby reducing the loss of the power supply circuit and effectively improving the efficiency of the power supply circuit.

[0026] In a fifth aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the control method as described in the embodiment of the first aspect above.

[0027] The control method of the power supply circuit of the air conditioner provided by the embodiment of the present invention has at least the following beneficial effects: the power supply circuit is provided with a relay and the switch contact of the relay is connected in parallel with the thermistor, so that the thermistor can be short-circuited when the loss of the thermistor is large; when the power supply circuit is powered on, by obtaining the operating parameters characterizing the loss of the thermistor, when the operating parameters meet the preset conditions, indicating that the loss of the thermistor is large, the relay is controlled to operate so that the switch contact of the relay short-circuits the thermistor, thereby reducing the loss caused by the large operating current flowing through the thermistor, thereby reducing the loss of the power supply circuit and effectively improving the efficiency of the power supply circuit.

[0028] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0030] The present invention is further described below in conjunction with the accompanying drawings and embodiments;

[0031] Figure 1 is a circuit schematic diagram of a power supply circuit of an air conditioner provided in Embodiment 1 of the present invention;

[0032] Figure 2is a flow chart of a method for controlling a power circuit of an air conditioner provided in Embodiment 2 of the present invention;

[0033] Figure 3 is a flow chart of a method for controlling a power circuit of an air conditioner provided in Embodiment 3 of the present invention;

[0034] Figure 4 is a flow chart of a method for controlling a power circuit of an air conditioner provided in a fourth embodiment of the present invention;

[0035] Figure 5 is a flow chart of a method for controlling a power circuit of an air conditioner provided in Embodiment 5 of the present invention;

[0036] Figure 6 is a flow chart of a method for controlling a power circuit of an air conditioner provided in Embodiment 6 of the present invention;

[0037] Figure 7 is a circuit schematic diagram of a power supply circuit of an air conditioner provided in Embodiment 7 of the present invention;

[0038] Figure 8 It is a structural schematic diagram of the operation control device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0039] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0040] In the description of the embodiments of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, "above", "below", "within", etc. are understood to include the number itself, "at least one" means one or more, "at least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. If there is a description of "first", "second", etc., it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0041] It should be noted that the terms such as setting, installing, and connecting in the embodiments of the present invention should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the embodiments of the present invention in combination with the specific content of the technical solution. For example, the term "connection" can be a mechanical connection, an electrical connection, or mutual communication; it can be directly connected or indirectly connected through an intermediate medium.

[0042] It should be noted that the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] The power circuit of the air conditioner generally contains a large-capacity capacitor. When the air conditioner is powered on, the input power will charge the capacitor. At the moment of powering on, the capacitor is like a short circuit, which will cause a very large input current, causing subsequent circuit components to be damaged due to current overshoot.

[0044] At present, the power circuit of the air conditioner generally uses thermistor NTC to limit the input current and reduce the impact of current surge. However, thermistor NTC has a large resistance, and the normal operation of the subsequent circuit will produce a large circuit loss, resulting in low efficiency of the power circuit.

[0045] Based on this, an embodiment of the present invention provides a control method for a power supply circuit of an air conditioner, a power supply circuit of the air conditioner, an operation control device, an air conditioner and a computer-readable storage medium. The power supply circuit sets a relay RY3 and connects the switch contact of the relay RY3 in parallel with the thermistor NTC, so that the thermistor NTC can be short-circuited when the loss of the thermistor NTC is large; when the power supply circuit is powered on, by obtaining operating parameters characterizing the loss of the thermistor NTC, when the operating parameters meet the preset conditions, indicating that the loss of the thermistor NTC is large, the relay RY3 is controlled to operate, so that the switch contact of the relay RY3 short-circuits the thermistor NTC, thereby reducing the loss caused by the large operating current flowing through the thermistor NTC, thereby reducing the power supply circuit loss and effectively improving the efficiency of the power supply circuit.

[0046] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0047] Reference Figure 1 , Figure 1The power circuit includes a relay RY3 and an AC input terminal, a thermistor NTC, a rectifier module BR1 and a DC output terminal connected in sequence, and the switch contact of the relay RY3 is connected in parallel with the thermistor NTC. It can also be seen that the AC input end includes a live wire terminal L and a neutral wire terminal N, the DC output end includes a positive terminal P+ and a ground terminal GND, the power supply circuit also includes a first capacitor C1, a common-mode inductor L1, a second capacitor C2, a third capacitor C3, a first diode D1 and a switch tube Q1, the live wire terminal L is connected to one end of the first capacitor C1 and a first input end of the common-mode inductor L1, the neutral wire terminal N is connected to the other end of the first capacitor C1 and a second input end of the common-mode inductor L1, the first output end of the common-mode inductor L1 is connected to one end of the second capacitor C2 and an input end of the rectifier module BR1, the second output end of the common-mode inductor L1 is connected to the other end of the second capacitor C2 and another input end of the rectifier module BR1, one output end of the rectifier module BR1 is connected to one end of the third capacitor C3 and the positive terminal P+, and the other output end of the rectifier module BR1 is connected to the other end of the third capacitor C3 and the ground terminal GND. One end of the coil of relay RY3 is connected to the anode of the first diode D1 and a switch pin of the switch tube Q1, the other end of the coil of relay RY3 and the cathode of the first diode D1 are both connected to the DC power supply terminal +12V, the other switch pin of the switch tube Q1 is grounded, and the control pin of the switch tube Q1 can be connected to the control module, and the control module controls the action of relay RY3 by controlling the on and off of the switch tube Q1.

[0048] Reference Figure 2 The first aspect of the present invention provides a method for controlling a power circuit of an air conditioner, including but not limited to steps S210 to S220:

[0049] Step S210: obtaining operating parameters characterizing the loss of the thermistor NTC;

[0050] Step S220: When the operating parameters meet the preset conditions, the relay RY3 is controlled to operate so that the switch contacts short-circuit the thermistor NTC.

[0051] In this embodiment, the power circuit is provided with a relay RY3 and the switch contact of the relay RY3 is connected in parallel with the thermistor NTC, so that the thermistor NTC can be short-circuited when the loss of the thermistor NTC is large. However, it should be noted that the operation of the relay RY3 itself also requires a certain amount of power consumption, generally 0.3 to 2W. Therefore, it is particularly important to control the action of the relay RY3. When the power circuit is powered on, by obtaining the operating parameters that characterize the loss of the thermistor NTC, when the operating parameters meet the preset conditions, indicating that the loss of the thermistor NTC is large, the relay RY3 is controlled to act, so that the switch contact of the relay RY3 short-circuits the thermistor NTC, reducing the loss caused by the large operating current flowing through the thermistor NTC, thereby reducing the power circuit loss and effectively improving the efficiency of the power circuit.

[0052] In the control method of the power supply circuit of the air conditioner provided in some embodiments of the present invention, the DC output end supplies power to multiple loads, and the operating parameter is the load rate of each load when it is running; the preset condition is: the sum of the load rates of all the running loads is greater than the first preset value.

[0053] It is understandable that the load rate of the power circuit is different when the number of loads turned on is different. The greater the load rate, the greater the current flowing through the thermistor NTC, and therefore the greater the power loss of the thermistor NTC. The load rate of each load during operation is used as an operating parameter to characterize the loss of the thermistor NTC, and a first preset value is set as a critical threshold. When the sum of the load rates of all the loads in operation is greater than the first preset value, it indicates that the loss of the thermistor NTC is large, and then the relay RY3 is controlled to operate so that the switch contact of the relay RY3 short-circuits the thermistor NTC, reducing the loss of the power circuit and effectively improving the efficiency of the power circuit.

[0054] In the control method of the power supply circuit of the air conditioner provided in some embodiments of the present invention, the load includes a fan, the fan is provided with a first wind shield and a second wind shield, the load rate of the fan when running at the first wind shield is a second preset value, and the load rate of the fan when running at the second wind shield is a third preset value greater than the second preset value.

[0055] In addition, in the control method of the power supply circuit of the air conditioner provided in some embodiments of the present invention, the load also includes at least one of the following: a thermal imaging device; a swing device; a cleaning device.

[0056] Combination Figure 3As shown, after the air conditioner is turned on, the power circuit starts working and can output electric energy to loads such as the fan, thermal imaging device, swing device, and cleaning device. The load rate of the fan when running at the first windshield is set to 8, the load rate of the fan when running at the second windshield is set to 10, the load rate when the thermal imaging device is turned on is set to 5, the load rate when the swing device is turned on is set to 5, and the load rate when the cleaning device is turned on is set to 5; by judging whether each load is turned on and the on state, and then calculating the sum of the load rates of all the loads in operation, the first preset value is set to 9. When the sum of the load rates of all the loads in operation is greater than 9, the load rate of the current power circuit is large, and the loss of the thermistor NTC is also large, which is greater than the power consumption required for relay RY3 to maintain its own operation. At this time, relay RY3 is controlled to be closed, so that the switch contacts of relay RY3 short-circuit the thermistor NTC, reducing the power circuit loss and effectively improving the efficiency of the power circuit.

[0057] The solution provided by this embodiment is low-cost and easy to control. According to the early test of different load powers by the R&D personnel, the load rates of different loads are set respectively. When multiple loads are turned on, the load rates are accumulated. When the sum of the load rates exceeds the set value, the relay RY3 is turned on to short-circuit the thermistor NTC to power the air conditioner. Figure 3 As shown in , the load of the fan is controlled in two gears. It can be understood that the fan can be divided into more gears, and a corresponding load rate can be set for each gear.

[0058] In the control method of the power circuit of the air conditioner provided in some embodiments of the present invention, the load includes a fan, and the load rate of the fan is converted according to the measured wind speed. In the control method of the power circuit of the air conditioner provided in some embodiments of the present invention, the load rate of the fan is proportional to the cube of the wind speed.

[0059] It is understandable that some fans are controlled by stepless speed regulation, so the fan load rate can be set to be in a certain relationship with the wind speed. For example, as shown in reference 4, when the fan is turned on, the load rate Pv = x*V*V*V, where V is the wind speed and x is the load rate coefficient, which can be set according to actual debugging. In addition to the different ways of fan load rate, Figure 4 The load rate setting and control flow of other loads in the embodiment shown are the same as Figure 3The same, for example, the load rate when the thermal imaging device is turned on is set to 5, the load rate when the swing device is turned on is set to 5, and the load rate when the cleaning device is turned on is set to 5; by judging whether each load is turned on and the state of the on-state, and then calculating the sum of the load rates of all the loads in operation, the first preset value is set to 9. When the sum of the load rates of all the loads in operation is greater than 9, the load rate of the current power supply circuit is large, and the loss of the thermistor NTC is also large, which is greater than the power consumption required for relay RY3 to maintain its own operation. At this time, relay RY3 is controlled to be closed, so that the switch contacts of relay RY3 short-circuit the thermistor NTC, thereby reducing the loss of the power supply circuit and effectively improving the efficiency of the power supply circuit.

[0060] In the control method of the power circuit of the air conditioner provided in some embodiments of the present invention, the operating parameter is a first current value flowing through the thermistor NTC, and the preset condition is: the first current value is greater than a fourth preset value.

[0061] It is understandable that, in addition to using the load rate as the operating parameter to characterize the loss of the thermistor NTC, the first current value flowing through the thermistor NTC can also be used more directly as the operating parameter to characterize the loss of the thermistor NTC. When the first current value is greater than the fourth preset value, the loss of the thermistor NTC is large, which is greater than the power consumption required by the relay RY3 to maintain its own operation. At this time, the relay RY3 is controlled to be closed, so that the switch contact of the relay RY3 short-circuits the thermistor NTC, reducing the power circuit loss and effectively improving the efficiency of the power circuit. In specific implementation, refer to Figure 6 As shown, after the air conditioner is turned on, the input current is detected. When the input current is greater than the preset value, the control relay RY3 is closed. When the input current is less than the preset value, the control relay RY3 is not closed.

[0062] In the control method of the power circuit of the air conditioner provided in some embodiments of the present invention, the operating parameter is a first current value flowing through the thermistor NTC, and the preset condition is: the thermistor NTC loss converted according to the first current value is greater than a fifth preset value.

[0063] It can be understood that the first current value flowing through the thermistor NTC is used as the operating parameter to characterize the loss of the thermistor NTC. The first current value can be directly compared with the fourth preset value as a basis for judging whether the relay RY3 is closed, or the thermistor NTC loss can be converted according to the first current value, and then the thermistor NTC loss is compared with the fifth preset value. When the thermistor NTC loss converted according to the first current value is greater than the fifth preset value, the thermistor NTC loss is large, which is greater than the power consumption required by the relay RY3 to maintain its own operation. At this time, the relay RY3 is controlled to be closed, so that the switch contacts of the relay RY3 short-circuit the thermistor NTC, reducing the power circuit loss and effectively improving the efficiency of the power circuit. In specific implementation, refer to Figure 5 As shown, after the air conditioner is turned on, the input current Iin is detected, and then the resistance of the thermistor is calculated. Since the resistance of the thermistor is related to the current passing through and the temperature rise, the input current Iin needs to be detected; the real-time resistance of the thermistor is: R = k*(-A*Iin-B)+r, where k is the temperature coefficient of the thermistor, A is the current coefficient of the thermistor, B is the modulation rate, and r is the resistance of the thermistor when the ambient temperature is 25 degrees Celsius and no current passes through. The loss of the thermistor can be further calculated as Pn = Iin 2 *R, by judging the relationship between the loss Pn of the thermistor and the fifth preset value 9, when the loss Pn of the thermistor is greater than 9, the control relay is closed; when the loss Pn of the thermistor is less than 9, the control relay is not closed.

[0064] Reference Figure 7A second aspect of the present invention provides a power supply circuit for an air conditioner, comprising a relay RY3, a sampling module, a driving optocoupler IC7, and an AC input terminal, a thermistor NTC, a rectifier module BR1, and a DC output terminal connected in sequence; the switch contact of the relay RY3 is connected in parallel with the thermistor NTC; the sampling module is respectively connected to the thermistor NTC and the driving optocoupler IC7, and is used to collect the current flowing through the thermistor NTC; the driving optocoupler IC7 is used to output a control signal when the current flowing through the thermistor NTC is greater than a set value, so as to activate the relay RY3. It can also be seen that the AC input end includes a live wire terminal L and a neutral wire terminal N, the DC output end includes a positive terminal P+ and a ground terminal GND, the power supply circuit also includes a first capacitor C1, a common-mode inductor L1, a second capacitor C2, a third capacitor C3, a first diode D1 and a switch tube Q1, the live wire terminal L is connected to one end of the first capacitor C1 and a first input end of the common-mode inductor L1, the neutral wire terminal N is connected to the other end of the first capacitor C1 and a second input end of the common-mode inductor L1, the first output end of the common-mode inductor L1 is connected to one end of the second capacitor C2 and an input end of the rectifier module BR1, the second output end of the common-mode inductor L1 is connected to the other end of the second capacitor C2 and another input end of the rectifier module BR1, one output end of the rectifier module BR1 is connected to one end of the third capacitor C3 and the positive terminal P+, and the other output end of the rectifier module BR1 is connected to the other end of the third capacitor C3 and the ground terminal GND. One end of the coil of relay RY3 is connected to the anode of the first diode D1 and a switch pin of the switch tube Q1, the other end of the coil of relay RY3 and the cathode of the first diode D1 are both connected to the DC power supply terminal +12V, the other switch pin of the switch tube Q1 is grounded, and the control pin of the switch tube Q1 can be connected to the control module, and the control module controls the action of relay RY3 by controlling the on and off of the switch tube Q1.

[0065] It is understandable that there are many ways for the sampling module to collect the current flowing through the thermistor NTC, for example, it can be implemented by using a sampling resistor, a Hall device or a current transformer. Figure 7 As shown, the voltage division is achieved by connecting a first resistor R1 and a second resistor R2 in series.

[0066] According to the power supply circuit of the air conditioner provided by the embodiment of the present invention, the power supply circuit is provided with a relay RY3 and the switch contact of the relay RY3 is connected in parallel with the thermistor NTC, so that the thermistor NTC can be short-circuited when the loss of the thermistor NTC is large; when the power supply circuit is powered on, the sampling module collects the current flowing through the thermistor NTC and transmits it to the driving optocoupler. When the collected current flowing through the thermistor NTC is greater than the set value, it indicates that the loss of the thermistor NTC is large, which can make the light-emitting diode on the primary side of the driving optocoupler emit light, and then make the phototransistor on the secondary side of the driving optocoupler turn on, and the driving optocoupler outputs a control signal Ic to make the relay RY3 actuate, so that the switch contact of the relay RY3 short-circuits the thermistor NTC, thereby reducing the loss caused by the large operating current flowing through the thermistor NTC, thereby reducing the power supply circuit loss and effectively improving the efficiency of the power supply circuit.

[0067] Reference Figure 7 In the power supply circuit of the air conditioner provided in some embodiments of the present invention, a switch tube Q1 is also included, a switch pin of the switch tube Q1 is connected to one end of the coil of the relay RY3, the other end of the coil of the relay RY3 is connected to a DC power supply, the other switch pin of the switch tube Q1 is grounded, and the control pin of the switch tube Q1 is connected to the driving optocoupler.

[0068] It can be understood that the control signal Ic output by the driving optocoupler can be directly transmitted to the control pin of the switch tube Q1, thereby controlling the on and off of the switch tube Q1, or it can be indirectly transmitted to the control pin of the switch tube Q1. For example, the control signal Ic output by the driving optocoupler is first transmitted to the MCU module, and then the MCU module outputs the signal to the control pin of the switch tube Q1.

[0069] Reference Figure 8 The third aspect of the present invention provides an operation control device 800, including a memory 810, a processor 820, and a computer program stored in the memory 810 and executable on the processor 820. The processor 820 executes the program to implement the control method of the first aspect of the present invention.

[0070] According to the control method of the power supply circuit of the air conditioner provided by the embodiment of the present invention, the power supply circuit sets a relay RY3 and connects the switch contact of the relay RY3 in parallel with the thermistor NTC, so that the thermistor NTC can be short-circuited when the loss of the thermistor NTC is large; when the power supply circuit is powered on, by obtaining operating parameters that characterize the loss of the thermistor NTC, when the operating parameters meet the preset conditions, indicating that the loss of the thermistor NTC is large, the relay RY3 is controlled to operate, so that the switch contact of the relay RY3 short-circuits the thermistor NTC, thereby reducing the loss caused by the large operating current flowing through the thermistor NTC, thereby reducing the power supply circuit loss and effectively improving the efficiency of the power supply circuit.

[0071] In a fourth aspect, an embodiment of the present invention provides an air conditioner, comprising the power supply circuit of the embodiment of the second aspect above, or comprising the operation control device 800 of the embodiment of the third aspect above.

[0072] According to the control method of the power supply circuit of the air conditioner provided by the embodiment of the present invention, the power supply circuit sets a relay RY3 and connects the switch contact of the relay RY3 in parallel with the thermistor NTC, so that the thermistor NTC can be short-circuited when the loss of the thermistor NTC is large; when the power supply circuit is powered on, by obtaining operating parameters that characterize the loss of the thermistor NTC, when the operating parameters meet the preset conditions, indicating that the loss of the thermistor NTC is large, the relay RY3 is controlled to operate, so that the switch contact of the relay RY3 short-circuits the thermistor NTC, thereby reducing the loss caused by the large operating current flowing through the thermistor NTC, thereby reducing the power supply circuit loss and effectively improving the efficiency of the power supply circuit.

[0073] In a fifth aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the control method of the embodiment of the first aspect as described above.

[0074] According to the control method of the power supply circuit of the air conditioner provided by the embodiment of the present invention, the power supply circuit sets a relay RY3 and connects the switch contact of the relay RY3 in parallel with the thermistor NTC, so that the thermistor NTC can be short-circuited when the loss of the thermistor NTC is large; when the power supply circuit is powered on, by obtaining operating parameters that characterize the loss of the thermistor NTC, when the operating parameters meet the preset conditions, indicating that the loss of the thermistor NTC is large, the relay RY3 is controlled to operate, so that the switch contact of the relay RY3 short-circuits the thermistor NTC, thereby reducing the loss caused by the large operating current flowing through the thermistor NTC, thereby reducing the power supply circuit loss and effectively improving the efficiency of the power supply circuit.

[0075] It will be appreciated by those skilled in the art that all or some of the steps and systems in the disclosed methods above may be implemented as software, firmware, hardware and appropriate combinations thereof. Some physical components or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium or a non-transitory medium and a communication medium or a temporary medium. As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information such as computer-readable instructions, data structures, program modules or other data. Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disk DVD or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that may be used to store desired information and may be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0076] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A method for controlling a power circuit of an air conditioner, characterized in that: The power supply circuit includes a relay and an AC input terminal, a thermistor, a rectifier module and a DC output terminal connected in sequence, the switch contact of the relay is connected in parallel with the thermistor, and the method includes: Obtaining an operating parameter characterizing a loss condition of the thermistor; When the operating parameter meets the preset condition, the relay is controlled to operate so that the switch contact short-circuits the thermistor.

2. The control method according to claim 1, characterized in that: The DC output end supplies power to a plurality of loads, and the operating parameter is the load rate of each load during operation; the preset condition is that the sum of the load rates of all the loads in operation is greater than a first preset value.

3. The control method according to claim 2, characterized in that: The load includes a fan, which is provided with a first wind shield and a second wind shield. The load rate of the fan when running at the first wind shield is a second preset value, and the load rate of the fan when running at the second wind shield is a third preset value greater than the second preset value.

4. The control method according to claim 2, characterized in that: The load includes a fan, and the load rate of the fan is calculated according to the measured wind speed.

5. The control method according to claim 4, characterized in that: The load rate of the fan is proportional to the cube of the wind speed.

6. The control method according to claim 3 or 4, characterized in that: The load also includes at least one of the following: Thermal imaging device; Swinging wind device; Cleaning device.

7. The control method according to claim 1, characterized in that: The operating parameter is a first current value flowing through the thermistor, and the preset condition is: the first current value is greater than a fourth preset value.

8. The control method according to claim 1, characterized in that: The operating parameter is a first current value flowing through the thermistor, and the preset condition is that a thermistor loss calculated according to the first current value is greater than a fifth preset value.

9. A power supply circuit for an air conditioner, characterized in that: It includes a relay, a sampling module, a driving optical coupler, and an AC input terminal, a thermistor, a rectifier module and a DC output terminal connected in sequence; the switch contact of the relay is connected in parallel with the thermistor; the sampling module is respectively connected with the thermistor and the driving optical coupler to collect the current flowing through the thermistor; the driving optical coupler is used to output a control signal when the current flowing through the thermistor is greater than a set value, so as to activate the relay.

10. The power supply circuit according to claim 9, characterized in that: It also includes a switch tube, one switch pin of the switch tube is connected to one end of the coil of the relay, the other end of the coil of the relay is connected to a DC power supply, the other switch pin of the switch tube is grounded, and the control pin of the switch tube is connected to the driving optocoupler.

11. An operation control device, characterized in that: The invention comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the control method according to any one of claims 1 to 8.

12. An air conditioner, characterized in that: Includes the power supply circuit according to claim 9 or 10, or includes the operation control device according to claim 11.

13. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the control method according to any one of claims 1 to 8.

Images