Air conditioner

Abstract

The utility model discloses an air conditioner which comprises a single-phase electricity taking circuit, and the single-phase electricity taking circuit is connected to a single-phase electricity load through a rectifying circuit. The voltage sampling circuit comprises a voltage division circuit and a conversion circuit, the voltage division circuit is connected with the direct-current voltage output end of the rectification circuit, a voltage division point of the voltage division circuit is connected to the input end of the conversion circuit, and the output end of the conversion circuit is used for outputting a level signal corresponding to the voltage of the voltage division point of the voltage division circuit; and the switching circuit is arranged between the direct-current voltage output end of the rectifying circuit and the single-phase electric load, and the switching circuit is used for triggering the switching action according to the level of the level signal. According to the embodiment of the invention, the switching circuit can be triggered to be switched off when the direct current voltage is too high, and the safety of the single-phase electric load is protected.

Description

Technical Field

[0001] The present application relates to the technical field of power supply control, and in particular to an air conditioner. Background Art

[0002] Air conditioners that use three-phase power supply often have some loads or control boards in their internal circuits that only require single-phase power supply. In this case, the single-phase power supply can only be obtained by extracting the neutral wire and one of the live wires from the three-phase power supply to form a single-phase power supply. Since the three-phase four-wire system has three live wires, wiring personnel may make wiring errors when wiring single-phase power supply, connecting two live wires, which will cause the original voltage to be drawn to change from 220V to 380V. At present, there is no protection measure for single-phase power supply in air conditioners, which is easy to cause overvoltage damage to the rear-end load. Utility Model Content

[0003] This embodiment provides an air conditioner, which can trigger a switch circuit to disconnect when the DC voltage is too high, thereby protecting the safety of single-phase power loads.

[0004] In a first aspect, an embodiment of the present application provides an air conditioner, comprising:

[0005] A single-phase power supply circuit, wherein the single-phase power supply circuit is connected to a single-phase power load through a rectifier circuit;

[0006] A voltage sampling circuit, comprising a voltage dividing circuit and a conversion circuit, wherein the voltage dividing circuit is connected to the DC voltage output terminal of the rectifier circuit, the voltage dividing point of the voltage dividing circuit is connected to the input terminal of the conversion circuit, and the output terminal of the conversion circuit is used to output a level signal corresponding to the voltage magnitude of the voltage dividing point of the voltage dividing circuit;

[0007] The switch circuit is arranged between the DC voltage output terminal of the rectifier circuit and the single-phase power load, and the switch circuit is used to trigger the switching action by the level of the level signal.

[0008] In some embodiments, the conversion circuit includes a switching device and an isolation device, the switching device includes a first switch pin, a second switch pin and a control pin, the control pin is connected to the input end of the conversion circuit, the first switch pin is connected to the input end of the isolation device, the second switch pin is connected to the ground end, and the output end of the isolation device is connected to the output end of the conversion circuit.

[0009] In some embodiments, the switch device is a triode, the base of the triode is the control pin, the collector of the triode is the first switch pin, and the emitter of the triode is the second switch pin;

[0010] Alternatively, the switching device is a shunt regulator tube, the reference end of the shunt regulator tube is the control pin, the cathode of the shunt regulator tube is the first switch pin, and the anode of the shunt regulator tube is the second switch pin.

[0011] In some embodiments, the isolation device includes an optocoupler device, a light-emitting end of the optocoupler device is connected to a first constant voltage source and the first switch pin, and a light-sensing end of the optocoupler device is connected to an output end of the conversion circuit.

[0012] In some embodiments, the conversion circuit includes an optocoupler device, a light-emitting end of the optocoupler device is connected to a voltage dividing point and a ground end of the voltage dividing circuit, and a light-sensing end of the optocoupler device is connected to an output end of the conversion circuit.

[0013] In some embodiments, the conversion circuit also includes a first capacitor, a first resistor and a second resistor. The photosensitizing end of the optocoupler device is connected to the ground end through the first resistor and the first capacitor, and is also connected to the ground end through the second resistor. The connection point between the first resistor and the first capacitor serves as the output end of the conversion circuit.

[0014] In some embodiments, the conversion circuit includes a comparator circuit, the inverting input terminal of the comparator circuit is connected to the voltage dividing point of the voltage dividing circuit, the non-inverting input terminal of the comparator circuit is connected to a reference voltage source, and the output terminal of the comparator circuit is connected to the output terminal of the conversion circuit.

[0015] In some embodiments, the conversion circuit also includes a third resistor and a fourth resistor connected in series, the second constant voltage source is connected to the ground terminal through the third resistor and the fourth resistor, and the connection point between the third resistor and the fourth resistor is connected to the positive input terminal of the comparator circuit as the reference voltage source.

[0016] In some embodiments, the reference voltage source is further connected to the output terminal of the comparator circuit through a fifth resistor.

[0017] In some embodiments, the switch circuit includes a switch tube, and a control pin of the switch tube is connected to an output end of the conversion circuit.

[0018] The air conditioner of this embodiment has at least the following beneficial effects: for single-phase power loads, the DC voltage of the rectifier circuit of the single-phase power supply circuit is sampled by a voltage sampling circuit, and converted into a level signal output according to the sampled voltage. The level signal triggers the switching action of the switch circuit according to the level size, and can trigger the switch circuit to disconnect when the DC voltage is too high, thereby protecting the safety of the single-phase power load.

[0019] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained through the structures particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a structural schematic diagram of an air conditioner provided in an embodiment of the present application;

[0021] Figure 2 is a circuit diagram of a voltage sampling circuit provided by an embodiment of the present application;

[0022] Figure 3 is a circuit diagram of a voltage sampling circuit provided by another embodiment of the present application;

[0023] Figure 4 is a circuit diagram of a voltage sampling circuit provided by another embodiment of the present application;

[0024] Figure 5 is a circuit diagram of a voltage sampling circuit provided in another embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. In addition, the characteristics, operations or features described in the specification can be combined in any appropriate manner to form various implementation methods.

[0026] In the description of this application, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", 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.

[0027] The serial numbers of the components in this document, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0028] Air conditioners that use three-phase power supply often have some loads or control boards in their internal circuits that only require single-phase power supply. In this case, the single-phase power supply can only be obtained by extracting the neutral wire and one of the live wires from the three-phase power supply to form a single-phase power supply. Since the three-phase four-wire system has three live wires, wiring personnel may make wiring errors when wiring single-phase power supply, connecting two live wires, which will cause the original voltage to be drawn to change from 220V to 380V. At present, there is no protection measure for single-phase power supply in air conditioners, which is easy to cause overvoltage damage to the rear-end load.

[0029] Based on this, this embodiment provides an air conditioner. For single-phase power loads, the DC voltage of the rectifier circuit of the single-phase power supply circuit is sampled through a voltage sampling circuit, and the sampled voltage is converted into a level signal output. The level signal triggers the switching action of the switching circuit according to the level size, and can trigger the switching circuit to disconnect when the DC voltage is too high, thereby protecting the safety of the single-phase power load.

[0030] Reference Figure 1 As shown, Figure 1 It is a structural schematic diagram of an air conditioner provided in an embodiment of the present application.

[0031] In some embodiments, the air conditioner includes a single-phase power supply circuit 100, a voltage sampling circuit 400 and a switching circuit 300. The single-phase power supply circuit 100 is connected to the single-phase power load 200 through a rectifier circuit 500. The voltage sampling circuit 400 is arranged between the rectifier circuit 500 and the single-phase power load 200. The voltage sampling circuit 400 includes a voltage divider circuit and a conversion circuit.

[0032] Reference Figure 2 As shown, Figure 2 4 is a circuit diagram of a voltage sampling circuit 400 provided in one embodiment of the present application.

[0033] In some embodiments, the voltage sampling circuit 400 includes a voltage divider circuit and a conversion circuit. The voltage divider circuit is connected to the DC voltage output end of the rectifier circuit 500, and the voltage dividing point of the voltage divider circuit (Vf in the figure) is connected to the input end of the conversion circuit. The output end of the conversion circuit is used to output a level signal corresponding to the voltage size of the voltage dividing point of the voltage divider circuit, so as to facilitate the subsequent control of whether to turn on the single-phase power load 200 according to the level of the level signal.

[0034] The switch circuit 300 is arranged between the DC voltage output terminal of the rectifier circuit 500 and the single-phase power load 200 . The switch circuit 300 is used to perform a switching action triggered by the level of the level signal.

[0035] It can be understood that the first level in the embodiment of the present application can be a high level signal or a low level signal, that is, when the first level is a high level signal, the voltage input to the single-phase power circuit 100 can be determined to be a high voltage, or when the first level is a low level signal, the voltage input to the single-phase power circuit 100 can be determined to be a low voltage, etc. The embodiment of the present application takes the case where the voltage input to the single-phase power circuit 100 is determined to be a low voltage when the first level is a low level signal as an example for specific description.

[0036] In some embodiments, the conversion circuit includes a switching device and an isolation device, the switching device includes a first switch pin, a second switch pin and a control pin, the control pin is connected to the input end of the conversion circuit, the first switch pin is connected to the input end of the isolation device, the second switch pin is connected to the ground end, and the output end of the isolation device is connected to the output end of the conversion circuit. By setting the switching device and the isolation device, the single-phase power load 200 can be protected from voltage shock and current shock, and the abnormal voltage or current input by the voltage divider circuit can be prevented from causing damage to the single-phase power load 200 connected to the output end, thereby improving the safety and reliability of the air conditioner, and the first switch pin of the switching device is connected to the input end of the isolation device, so that the isolation device can sense the level of the level signal, thereby avoiding damage to the single-phase power load 200 due to wiring errors.

[0037] In some embodiments, the switching device is a transistor Q1, the base of the transistor Q1 is a control pin, the collector of the transistor Q1 is a first switch pin, and the emitter of the transistor Q1 is a second switch pin, that is, in the embodiment of the present application, the base of the transistor Q1 is connected to the input end of the conversion circuit, the collector of the transistor Q1 is connected to the input end of the isolation device, and the emitter of the transistor Q1 is connected to the ground end.

[0038] It is worth noting that the transistor Q1 in the embodiment of the present application can be turned on or off according to the input level. Specifically, the control pin of the transistor Q1 is connected to the input end of the conversion circuit, and the voltage dividing point of the voltage dividing circuit is connected to the input end of the conversion circuit. When the level signal corresponding to the high level input of the voltage dividing circuit is a high level signal, the control pin of the transistor Q1 receives the high level signal input from the input end of the conversion circuit, and the first switch pin and the second switch pin are turned on; or, when the level signal corresponding to the low voltage input of the voltage dividing circuit is a low level signal, the control pin of the transistor Q1 receives the low level signal input from the input end of the conversion circuit, and the first switch pin and the second switch pin are not turned on.

[0039] In some embodiments, the isolation device includes an optocoupler device IC1, the light-emitting end of the optocoupler device IC1 is connected to the first constant voltage source and the first switch pin, and the photosensitive end of the optocoupler device IC1 is connected to the output end of the conversion circuit. Specifically, the light-emitting end of the optocoupler device IC1 in the embodiment of the present application includes a first pin and a second pin, and the photosensitive end includes a third pin and a fourth pin. The first pin is connected to the first constant voltage source, the second pin is connected to the collector of the transistor Q1, the third pin is connected to the output end of the conversion circuit, and the fourth pin is connected to the constant voltage source.

[0040] It can be understood that the light-emitting end of the optocoupler device IC1 is connected to the first switch pin of the switching device to receive the level of the switching device input. In the embodiment of the present application, the light-emitting end of the optocoupler device IC1 can be a light-emitting diode, and the light-sensitive end can be a photosensitive receiver, for example, a phototransistor, a photosensitive diode or a phototransistor, etc.

[0041] In some embodiments, the conversion circuit further includes a first capacitor C1, a first resistor R1, and a second resistor R2. The photosensitive end of the optocoupler IC1 is connected to the ground terminal through the first resistor R1 and the first capacitor C1. The photosensitive end of the optocoupler IC1 is also connected to the ground terminal through the second resistor R2. The connection point between the first resistor R1 and the first capacitor C1 serves as the output terminal of the conversion circuit, that is, one end of the first capacitor C1 is connected between the first resistor R1 and the output terminal of the conversion circuit, and the other end is connected between the second resistor R2 and the ground terminal. The first capacitor C1 and the first resistor R1 in the embodiment of the present application can form a low-pass filter together, thereby reducing high-frequency noise in the signal received from the photosensitive end of the optocoupler IC1. The mutual cooperation of the first capacitor C1, the first resistor R1, and the second resistor R2 can reduce the fluctuation of the signal, provide a smoother output, further improve the reliability and stability of the air conditioner, and reduce the probability of failure.

[0042] Specifically, the third pin of the photosensitive end of the optocoupler device IC1 in the embodiment of the present application is connected to the ground terminal through the first resistor R1 and the first capacitor C1, and the third pin is also connected to the ground terminal through the second resistor R2.

[0043] Figure 2 Taking the switching device as transistor Q1 as an example, the first pin of the light-emitting end of the optocoupler device IC1 is connected to the first constant voltage source, the second pin is connected to the first switch pin of the transistor Q1, the third pin is connected to the output end of the conversion circuit, and the fourth pin is connected to the constant voltage source, wherein, Figure 2The first constant voltage source in is a 17V / 100mA constant voltage source. Since the control pin of the transistor Q1 in the embodiment of the present application is connected to the input end of the conversion circuit, and the voltage dividing point of the voltage dividing circuit is connected to the input end of the conversion circuit, when the level signal corresponding to the high voltage input by the voltage dividing circuit is a high level signal, the control pin of the transistor Q1 receives the high level signal input by the input end of the conversion circuit. At this time, the first switch pin and the second switch pin are turned on, and the first constant voltage source forms a loop with the ground end, that is, the 17V / 100mA constant voltage source forms a loop with the ground end, and the voltage flows into the light-emitting end of the optocoupler device IC1. At this time, the element at the light-emitting end of the optocoupler device IC1 generates a light signal. The photosensitive end in the optocoupler device IC1 senses the light signal at the light-emitting end, so that the constant voltage source connected to the fourth pin forms a loop with the ground end. At this time, the output end of the conversion circuit connected to the third pin outputs a high-level signal corresponding to the high voltage. Through the working state of the light-emitting end in the optocoupler device IC1 and the level signal output by the conversion circuit, it is determined that the voltage input to the single-phase power supply circuit 100 is too high at this time, and the single-phase power load 200 is turned off, so that the single-phase power load 200 is not connected to the single-phase power supply circuit 100, thereby protecting the single-phase power load 200 and avoiding damage to the single-phase power load 200.

[0044] In some embodiments, when the level signal corresponding to the low voltage input by the voltage divider circuit is a low level signal, the control pin of the transistor Q1 receives the low level signal input by the input end of the conversion circuit. At this time, the first switch pin and the second switch pin are not conducting, and the output end of the conversion circuit directly outputs a level signal corresponding to the voltage magnitude of the voltage divider of the voltage divider circuit, that is, a low level signal. By determining through the low level signal that the voltage input by the single-phase power supply circuit 100 is a low voltage at this time, the single-phase power load 200 can be turned on, so that the single-phase power load 200 is connected to the single-phase power supply circuit 100, thereby achieving stable power supply to the single-phase power load 200.

[0045] It is understandable that there is no direct electrical connection between the light-emitting end and the light-sensing end in the optocoupler device IC1 in the embodiment of the present application, and they are coupled through optical signals. This design provides good electrical isolation, can prevent mutual interference between circuits, improve the safety and reliability of the system, and there is no need to worry about signal distortion or circuit damage.

[0046] In some embodiments, the embodiments of the present application can set different voltage divider circuits according to the components included in different switch devices and isolation devices. Specifically, Figure 2 For example, the switching device is transistor Q1, and the isolation device includes optocoupler device IC1. Figure 2In the case of, the voltage divider circuit includes a resistor group, which includes a sixth resistor R6, a seventh resistor R7, an eighth resistor R8 and a ninth resistor R9, wherein the sixth resistor R6, the seventh resistor R7 and the eighth resistor R8 are connected in series in sequence, one end of the sixth resistor R6 is connected to the rectifier circuit 500, and the other end is connected to the seventh resistor R7, the single-phase power supply circuit 100 is connected to the ground terminal through the rectifier circuit 500, the sixth resistor R6, the seventh resistor R7 and the eighth resistor R8 in sequence, the base of the transistor Q1 is connected between the seventh resistor R7 and the eighth resistor R8, and the base of the transistor Q1 is also connected to the ground terminal through the ninth resistor R9, that is, one end of the ninth resistor R9 is connected to the base of the transistor Q1 and the connection point between the seventh resistor R7 and the eighth resistor R8 (the voltage divider circuit), and the other end is connected between the eighth resistor R8 and the ground terminal. The embodiment of the present application dynamically adjusts the voltage threshold of the voltage divider circuit by adjusting the resistance value of each resistor in the resistor group, so that the resistance value of the resistor can be adjusted as needed to achieve dynamic adjustment of the voltage threshold, so that the air conditioner can be applied to more occasions.

[0047] Reference Figure 3 As shown, Figure 3 is a circuit diagram of a voltage sampling circuit 400 provided in another embodiment of the present application.

[0048] In some embodiments, Figure 3 In the voltage sampling circuit 400 shown, the switching device is a parallel voltage regulator IC2, the reference end of the parallel voltage regulator IC2 is the control pin, the cathode of the parallel voltage regulator IC2 is the first switch pin, and the anode of the parallel voltage regulator IC2 is the second switch pin. Specifically, the reference end of the parallel voltage regulator IC2 is connected to the input end of the conversion circuit, the cathode is connected to the input end of the isolation device, and the anode is connected to the ground end.

[0049] Depend on Figure 3 It can be seen that Figure 3 The isolation device also includes an optocoupler device IC1, the light-emitting end of the optocoupler device IC1 is connected to the first constant voltage source and the first switch pin, and the photosensitive end of the optocoupler device IC1 is connected to the output end of the conversion circuit. Specifically, the light-emitting end of the optocoupler device IC1 in the embodiment of the present application includes a first pin and a second pin, and the photosensitive end includes a third pin and a fourth pin. The first pin is connected to the first constant voltage source, the second pin is connected to the cathode of the parallel voltage regulator IC2, the third pin is connected to the output end of the conversion circuit, and the fourth pin is connected to the constant voltage source.

[0050] It can be understood that the light-emitting end of the optocoupler device IC1 is connected to the first switch pin of the switching device to receive the level of the switching device input. In the embodiment of the present application, the light-emitting end of the optocoupler device IC1 can be a light-emitting diode, and the light-sensitive end can be a photosensitive receiver, for example, a phototransistor Q1, a photosensitive diode or a phototransistor, etc.

[0051] In some embodiments, Figure 3 The conversion circuit in also includes a first capacitor C1, a first resistor R1 and a second resistor R2, the photosensitive end of the optocoupler IC1 is connected to the ground terminal through the first resistor R1 and the first capacitor C1, the photosensitive end of the optocoupler IC1 is also connected to the ground terminal through the second resistor R2, and the connection point of the first resistor R1 and the first capacitor C1 serves as the output terminal of the conversion circuit, that is, one end of the first capacitor C1 is connected between the first resistor R1 and the output terminal of the conversion circuit, and the other end is connected between the second resistor R2 and the ground terminal. The first capacitor C1 and the first resistor R1 in the embodiment of the present application can form a low-pass filter together, thereby reducing the high-frequency noise in the signal received from the photosensitive end of the optocoupler IC1, and the mutual cooperation of the first capacitor C1, the first resistor R1 and the second resistor R2 can reduce the fluctuation of the signal, provide a smoother output, further improve the reliability and stability of the air conditioner, and reduce the probability of failure.

[0052] Specifically, the third pin of the photosensitive end of the optocoupler device IC1 in the embodiment of the present application is connected to the ground terminal through the first resistor R1 and the first capacitor C1, and the third pin is also connected to the ground terminal through the second resistor R2.

[0053] The specific working process of the parallel voltage regulator IC2 in the embodiment of the present application is as follows.

[0054] In some embodiments, the reference end of the parallel voltage regulator IC2 in the embodiment of the present application is connected to the input end of the conversion circuit, and the voltage dividing point of the voltage divider circuit is connected to the input end of the conversion circuit, so that the reference end of the parallel voltage regulator IC2 is connected to the voltage dividing point of the voltage divider circuit. When the voltage at the reference end of the shunt regulator IC2 is higher than 2.5V, the cathode and anode in the shunt regulator IC2 are turned on, so that the first constant voltage source forms a loop with the ground end, that is, the 17V / 100mA constant voltage source forms a loop with the ground end, and the voltage flows into the light-emitting end of the optocoupler IC1. At this time, the element at the light-emitting end in the optocoupler IC1 generates a light signal, and the photosensitive end in the optocoupler IC1 senses the light signal at the light-emitting end, so that the constant voltage source connected to the fourth pin forms a loop with the ground end. At this time, the output end of the conversion circuit connected to the third pin outputs a high-level signal corresponding to the high voltage. Through the working state of the light-emitting end in the optocoupler IC1 and the level signal output by the conversion circuit, it is determined that the voltage input to the single-phase power supply circuit 100 is too high, and the single-phase power load 200 is turned off, so that the single-phase power load 200 is not connected to the single-phase power supply circuit 100, thereby protecting the single-phase power load 200 and avoiding damage to the single-phase power load 200.

[0055] In some embodiments, when the level signal corresponding to the low voltage input by the voltage divider circuit is a low level signal, the input voltage of the reference end of the parallel voltage regulator IC2 is lower than 2.5V. At this time, the cathode and anode of the parallel voltage regulator IC2 are not conductive, and the output end of the conversion circuit directly outputs a level signal corresponding to the voltage of the divided voltage of the voltage divider circuit, that is, a low level signal. By determining through the low level signal that the voltage input by the single-phase power supply circuit 100 is a low voltage at this time, the single-phase power load 200 can be turned on, so that the single-phase power load 200 is connected to the single-phase power supply circuit 100, thereby achieving stable power supply to the single-phase power load 200.

[0056] Specifically, Figure 3 For example, the switching device is a parallel voltage regulator IC2, and the isolation device includes an optocoupler IC1. Figure 3 In the case of, the voltage divider circuit includes a resistor group, the resistor group includes a sixth resistor R6, a seventh resistor R7, an eighth resistor R8 and a ninth resistor R9, wherein the sixth resistor R6, the seventh resistor R7, the eighth resistor R8 and the ninth resistor R9 are connected in series in sequence, the reference end of the parallel voltage regulator IC2 is connected between the seventh resistor R7 and the eighth resistor R8, and the anode of the parallel voltage regulator IC2 is connected between the ninth resistor R9 and the ground terminal. The embodiment of the present application dynamically adjusts the voltage threshold of the voltage divider circuit by the resistance value of each resistor in the resistor group, so that the resistance value of the resistor can be adjusted as needed, and the voltage threshold is dynamically adjusted, so that the air conditioner can be applied to more occasions.

[0057] Reference Figure 4 As shown, Figure 4 is a circuit diagram of a voltage sampling circuit 400 provided in another embodiment of the present application.

[0058] In some embodiments, the conversion circuit includes an optocoupler IC1, and the light-emitting end of the optocoupler IC1 is directly connected to the voltage dividing point and the grounding end of the voltage dividing circuit. After the single-phase power supply circuit 100 inputs voltage to the voltage sampling circuit 400, the optocoupler IC1 controls whether the components of the light-emitting end work through the level of the voltage dividing point output of the voltage dividing circuit. For example, if the voltage input to the single-phase power supply circuit 100 is large, the components of the light-emitting end of the optocoupler IC1 emit light. If the voltage input to the single-phase power supply circuit 100 is small, the components of the light-emitting end of the optocoupler IC1 do not emit light. The photosensitive end of the optocoupler IC1 is connected to the output end of the conversion circuit, so that the level of the output end of the conversion circuit can be used to control whether the single-phase power supply circuit 100 supplies power to the single-phase power load 200.

[0059] It should be noted that Figure 4The light-emitting end of the optocoupler device IC1 includes a first pin and a second pin, and the light-sensing end includes a third pin and a fourth pin. Specifically, the first pin is connected to the voltage dividing point of the voltage dividing circuit, the second pin is connected to the ground terminal, the third pin is connected to the output terminal of the conversion circuit, and the fourth pin is connected to the constant voltage source.

[0060] In some embodiments, when the level signal corresponding to the high voltage input by the voltage divider circuit is a high level signal, the first pin of the optocoupler device IC1 receives the high level signal input by the input end of the conversion circuit. At this time, the element at the light-emitting end of the optocoupler device IC1 generates a light signal, and the photosensitive end of the optocoupler device IC1 senses the light signal at the light-emitting end, so that the constant voltage source connected to the fourth pin and the ground end form a loop. At this time, the output end of the conversion circuit connected to the third pin outputs a high level signal corresponding to the high voltage. Through the working state of the light-emitting end in the optocoupler device IC1 and the level signal output by the conversion circuit, it is determined that the voltage input to the single-phase power supply circuit 100 is too high, and the single-phase power load 200 is turned off, so that the single-phase power load 200 is not connected to the single-phase power supply circuit 100, thereby protecting the single-phase power load 200 and avoiding damage to the single-phase power load 200.

[0061] When the level signal corresponding to the low voltage input by the voltage divider circuit is a low level signal, the light-emitting end of the optocoupler device IC1 is not lit, and the output end of the conversion circuit directly outputs a level signal corresponding to the voltage of the voltage divider circuit, that is, a low level signal. By determining through the low level signal that the voltage input by the single-phase power supply circuit 100 is a low voltage, the single-phase power load 200 can be turned on, so that the single-phase power load 200 is connected to the single-phase power supply circuit 100, thereby realizing a stable power supply to the single-phase power load 200.

[0062] Specifically, in Figure 4In the case of, the voltage divider circuit includes a resistor group, which includes a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10 and an eleventh resistor R11, wherein the sixth resistor R6, the seventh resistor R7 and the eighth resistor R8 are connected in series in sequence, one end of the sixth resistor R6 is connected to the rectifier circuit 500, and the other end is connected to the seventh resistor R7, the single-phase power supply circuit 100 is connected to the ground terminal through the rectifier circuit 500, the sixth resistor R6, the seventh resistor R7 and the eighth resistor R8 in sequence, the first pin of the optocoupler device IC1 is connected between the seventh resistor R7 and the eighth resistor R8 (the voltage dividing point of the voltage divider circuit) through the tenth resistor R10, the second pin is connected between the eighth resistor R8 and the ground terminal, one end of the eleventh resistor R11 is connected between the tenth resistor R10 and the first pin, and the other end is connected between the second pin and the connection point between the eighth resistor R8 and the ground terminal. The embodiment of the present application dynamically adjusts the voltage threshold of the voltage divider circuit by adjusting the resistance value of each resistor in the resistor group, so that the resistance value of the resistor can be adjusted as needed to achieve dynamic adjustment of the voltage threshold, so that the air conditioner can be applied to more occasions.

[0063] Reference Figure 5 As shown, Figure 5 is a circuit diagram of a voltage sampling circuit 400 provided in another embodiment of the present application.

[0064] In some embodiments, the conversion circuit includes a comparator circuit IC3, the inverting input terminal of the comparator circuit IC3 is connected to the voltage dividing point of the voltage dividing circuit, the non-phase input terminal of the comparator circuit IC3 is connected to the reference voltage source, and the output terminal of the comparator circuit IC3 is connected to the output terminal of the conversion circuit, so that the voltage in the voltage dividing circuit can be sampled by the comparator circuit IC3, and the voltage at the voltage dividing point and the voltage of the reference voltage source can be compared. After comparison, a level signal is output, so that the single-phase power supply circuit 100 can be controlled to supply power to the single-phase power load 200 according to the level size.

[0065] Specifically, when the level signal corresponding to the high voltage input by the voltage divider circuit is a high level signal, the voltage at the inverting input terminal of the comparator circuit IC3 is greater than the voltage at the non-inverting input terminal, and the output terminal of the comparator circuit IC3 outputs a high level signal, that is, the output terminal of the conversion circuit outputs a high level signal, thereby being able to determine that the voltage input to the single-phase power supply circuit 100 is too high at this time, and continuing to shut down the single-phase power load 200 to protect the single-phase power load 200 and avoid damage to the single-phase power load 200.

[0066] When the level signal corresponding to the low voltage input by the voltage divider circuit is a low level signal, the voltage at the inverting input terminal of the comparator circuit IC3 is less than the voltage at the non-inverting input terminal, and the output terminal of the comparator circuit IC3 outputs a low level signal. The low level signal is used to determine that the voltage input to the single-phase power supply circuit 100 is a low voltage, and the single-phase power load 200 can be turned on, so that the single-phase power load 200 is connected to the single-phase power supply circuit 100, thereby achieving stable power supply to the single-phase power load 200.

[0067] Specifically, in Figure 5 In the case of, the voltage divider circuit includes a resistor group, the resistor group includes a sixth resistor R6, a seventh resistor R7, an eighth resistor R8 and a ninth resistor R9, wherein the sixth resistor R6, the seventh resistor R7 and the eighth resistor R8 are connected in series in sequence, the inverting input terminal of the comparator circuit IC3 is connected between the seventh resistor R7 and the eighth resistor R8, and one end of the ninth resistor R9 is connected between the inverting input terminal and the voltage dividing point of the voltage divider circuit, and the other end is connected between the eighth resistor R8 and the connection ground. The embodiment of the present application dynamically adjusts the voltage threshold of the voltage divider circuit by the resistance value of each resistor in the resistor group, so that the resistance value of the resistor can be adjusted as needed, and the voltage threshold is dynamically adjusted, so that the air conditioner can be applied to more occasions.

[0068] refer to Figure 5 In some embodiments, the conversion circuit further includes a third resistor R3 and a fourth resistor R4 connected in series, the second constant voltage source is connected to the ground terminal through the third resistor R3 and the fourth resistor R4, and the connection point of the third resistor R3 and the fourth resistor R4 is connected to the non-inverting input terminal of the comparator circuit IC3 as a reference voltage source, thereby providing a stable reference voltage point, reducing the influence of power supply noise on the reference voltage, and improving the stability of the system.

[0069] In some embodiments, the reference voltage source is further connected to the output terminal of the comparator circuit IC3 through a fifth resistor R5, thereby further improving the stability of the reference voltage source and the accuracy of the comparison voltage of the comparator circuit IC3.

[0070] It can be understood by those skilled in the art that Figure 1-5 The schematic diagrams shown in the figure do not constitute a limitation on the embodiments of the present application, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0071] The features disclosed in the various product embodiments provided by the utility model can be arbitrarily combined without conflict to obtain new product embodiments.

[0072] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, i.e., they may be located in one place, or they may be distributed to multiple network nodes. Exemplarily, the division of units is only a logical function division, and there may be other division methods in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be ignored, or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed may be through some interfaces, indirect coupling or communication connection of devices or units, which may be electrical, mechanical, or other forms. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment.

[0073] It will be appreciated by those skilled in the art that the system disclosed above may be implemented as software, firmware, hardware, and appropriate combinations thereof. Some 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 as hardware, or as an integrated circuit, such as an application specific integrated circuit.

[0074] The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the above implementation mode. Technical personnel familiar with the field can also make various equivalent deformations or substitutions without violating the spirit of the present invention. These equivalent deformations or substitutions are all included in the scope defined by the claims of the present invention.

Claims

1. An air conditioner, characterized in that: include: A single-phase power supply circuit, wherein the single-phase power supply circuit is connected to a single-phase power load through a rectifier circuit; A voltage sampling circuit, comprising a voltage dividing circuit and a conversion circuit, wherein the voltage dividing circuit is connected to the DC voltage output terminal of the rectifier circuit, the voltage dividing point of the voltage dividing circuit is connected to the input terminal of the conversion circuit, and the output terminal of the conversion circuit is used to output a level signal corresponding to the voltage magnitude of the voltage dividing point of the voltage dividing circuit; The switch circuit is arranged between the DC voltage output terminal of the rectifier circuit and the single-phase power load, and the switch circuit is used to trigger the switching action by the level of the level signal.

2. The air conditioner according to claim 1, characterized in that: The conversion circuit includes a switching device and an isolation device, the switching device includes a first switch pin, a second switch pin and a control pin, the control pin is connected to the input end of the conversion circuit, the first switch pin is connected to the input end of the isolation device, the second switch pin is connected to the ground end, and the output end of the isolation device is connected to the output end of the conversion circuit.

3. The air conditioner according to claim 2, characterized in that: The switch device is a triode, the base of the triode is the control pin, the collector of the triode is the first switch pin, and the emitter of the triode is the second switch pin; Alternatively, the switching device is a shunt regulator tube, the reference end of the shunt regulator tube is the control pin, the cathode of the shunt regulator tube is the first switch pin, and the anode of the shunt regulator tube is the second switch pin.

4. The air conditioner according to claim 2, characterized in that: The isolation device comprises an optocoupler device, a light-emitting end of the optocoupler device is connected to a first constant voltage source and the first switch pin, and a light-sensing end of the optocoupler device is connected to an output end of the conversion circuit.

5. The air conditioner according to claim 1, characterized in that: The conversion circuit comprises an optocoupler device, a light-emitting end of the optocoupler device is connected to a voltage dividing point of the voltage dividing circuit and a grounding end, and a light-sensing end of the optocoupler device is connected to an output end of the conversion circuit.

6. The air conditioner according to claim 4 or 5, characterized in that: The conversion circuit also includes a first capacitor, a first resistor and a second resistor. The photosensitive end of the optocoupler device is connected to the ground end through the first resistor and the first capacitor, and is also connected to the ground end through the second resistor. The connection point between the first resistor and the first capacitor serves as the output end of the conversion circuit.

7. The air conditioner according to claim 1, characterized in that: The conversion circuit comprises a comparator circuit, an inverting input terminal of the comparator circuit is connected to a voltage dividing point of the voltage dividing circuit, a non-inverting input terminal of the comparator circuit is connected to a reference voltage source, and an output terminal of the comparator circuit is connected to an output terminal of the conversion circuit.

8. The air conditioner according to claim 7, characterized in that: The conversion circuit also includes a third resistor and a fourth resistor connected in series, the second constant voltage source is connected to the ground terminal through the third resistor and the fourth resistor, and the connection point of the third resistor and the fourth resistor is connected to the non-inverting input terminal of the comparator circuit as the reference voltage source.

9. The air conditioner according to claim 7 or 8, characterized in that: The reference voltage source is also connected to the output terminal of the comparator circuit through a fifth resistor.

10. The air conditioner according to claim 1, characterized in that: The switch circuit includes a switch tube, and a control pin of the switch tube is connected to the output end of the conversion circuit.

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