Air conditioner

Abstract

The utility model discloses an air conditioner. According to the air conditioner, the first contact of the relay is arranged in the connecting loop of the filter capacitor and the discharge resistor, so that the control circuit can control the relay to disconnect the first contact when the air conditioner is powered on, namely, the signal input end receives the input electric signal, and control the relay to disconnect the first contact when the signal input end does not receive the input electric signal. The relay can be in an initial conduction state all the time, so that when the air conditioner is powered off, the relay continuously conducts a connection loop of the discharge resistor and the filter capacitor, and when the air conditioner is powered on, the control circuit can control the relay to disconnect the connection loop of the discharge resistor and the filter capacitor. Therefore, charges stored in the filter capacitor can be quickly consumed, and meanwhile the operation power consumption of the air conditioner is reduced.

Description

Technical Field

[0001] This application relates to the field of air conditioning, and includes, but is not limited to, an air conditioner. Background Technology

[0002] To prevent interference from the external power grid or reduce the transmission of its own interference to the external power grid, air conditioners typically require a filter capacitor at the power input. Since capacitors have the ability to store charge, the larger the capacitance, the more charge they can store. However, to prevent electric shock when the power plug is unplugged, the national standard GB4706.1-2005 stipulates that the voltage between the pins of the power plug must not exceed the safe voltage of 36V within one second after the power is disconnected. Therefore, providing a discharge circuit that can quickly dissipate the charge stored in the filter capacitor is a problem that urgently needs to be solved in this field. Utility Model Content

[0003] In view of this, the air conditioner provided in this application embodiment can quickly consume the charge stored in the filter capacitor and reduce the operating power consumption of the air conditioner.

[0004] An air conditioner provided in this application embodiment includes:

[0005] chassis;

[0006] A circuit board, disposed within the housing, comprises:

[0007] The signal input terminal is configured to receive input electrical signals;

[0008] A filter capacitor, connected to the signal input terminal, is configured to filter out noise signals in the input electrical signal;

[0009] The discharge resistor, connected to the filter capacitor via a relay, is configured to consume the charge stored in the filter capacitor.

[0010] The relay includes a control terminal and a first contact. One end of the first contact is connected to the discharge resistor, and the other end of the first contact is connected to the filter capacitor, so that when the first contact is in the on state, a circuit is formed between the discharge resistor and the filter capacitor, and when the first contact is in the off state, a circuit cannot be formed between the discharge resistor and the filter capacitor.

[0011] A control circuit, wherein the power supply terminal of the control circuit is connected to the signal input terminal, and the output terminal of the control circuit is connected to the control terminal of the relay, so as to control the relay to disconnect the first contact when the control circuit is operating normally according to the input electrical signal;

[0012] In the case where the control circuit is not operating normally, the relay is in an initial state, and in the initial state, the first contact is in the conducting state.

[0013] In one embodiment, the air conditioner further includes a thermistor, one end of which is connected to the power supply terminal of the control circuit, and the other end of which is connected to the signal input terminal, so that when the signal input terminal receives the input electrical signal, the thermistor transmits the input electrical signal to the control circuit.

[0014] In one embodiment, the relay further includes a second contact connected in parallel with the thermistor to control the second contact to conduct when the control circuit is operating normally according to the input electrical signal, so as to transmit the input electrical signal to the control circuit through the second contact.

[0015] In one embodiment, the control circuit controls the second contact to turn on in a preset sequence, and controls the relay to turn off the first contact.

[0016] In one embodiment, the control circuit includes a voltage conversion sub-circuit and a controller. The output terminal of the voltage conversion sub-circuit is connected to the controller, and the input terminal of the voltage conversion sub-circuit is connected to the signal input terminal, so as to convert the input electrical signal into a power supply signal through the voltage conversion sub-circuit to supply power to the controller.

[0017] In one embodiment, the voltage conversion sub-circuit includes:

[0018] A rectifier unit, wherein the input terminal of the rectifier unit is connected to the signal input terminal, and the output terminal of the rectifier unit is connected to the power conversion unit to convert the input electrical signal into a DC signal;

[0019] A power conversion unit is provided, the input of which is connected to the output of the rectifier unit, and the output of which is connected to the controller, to adjust the voltage of the DC signal and output the power supply signal.

[0020] In one embodiment, the rectifier unit includes:

[0021] A rectifier bridge, wherein the input terminal of the rectifier bridge is connected to the signal input terminal, and the output terminal of the rectifier bridge is connected to the high-voltage energy storage element, so as to rectify the input electrical signal and output the rectified electrical signal to the high-voltage energy storage element;

[0022] The high-voltage energy storage element is connected in parallel with the power conversion unit to store the charge of the rectified electrical signal and release the stored charge to the power conversion unit.

[0023] In one embodiment, the high-voltage energy storage element is an electrolytic capacitor.

[0024] In one embodiment, the signal input terminal includes a first connection terminal and a second connection terminal, one end of the filter capacitor is connected to the first connection terminal, and the other end of the filter capacitor is connected to the second connection terminal, wherein the polarities of the first connection terminal and the second connection terminal are different.

[0025] In one embodiment, the first contact is a normally closed contact, and the second contact is a normally open contact.

[0026] In the aforementioned air conditioner, by setting the first contact of the relay in the connection circuit between the filter capacitor and the discharge resistor, the control circuit can control the relay to disconnect the first contact when the air conditioner is powered on, i.e., when the signal input terminal receives an input electrical signal. Conversely, when no input electrical signal is received at the signal input terminal, the relay can remain in the initial conducting state. This ensures that when the air conditioner is powered off, the relay continuously conducts the connection circuit between the discharge resistor and the filter capacitor, and when the air conditioner is powered on, the control circuit can control the relay to disconnect the connection circuit between the discharge resistor and the filter capacitor. This allows for the rapid dissipation of the charge stored in the filter capacitor, while simultaneously reducing the operating power consumption of the air conditioner. Attached Figure Description

[0027] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the specification, serve to explain the technical solutions of this application.

[0028] Figure 1 This is one of the structural schematic diagrams of an air conditioner provided in the embodiments of this application;

[0029] Figure 2 This is one of the schematic diagrams of the implementation structure of the air conditioner provided in the embodiments of this application;

[0030] Figure 3 This is a second schematic diagram of the structure of an air conditioner provided in an embodiment of this application;

[0031] Figure 4 This is the second schematic diagram of the implementation structure of the air conditioner provided in the embodiments of this application;

[0032] Figure 5 This is the third schematic diagram of the structure of the air conditioner provided in the embodiments of this application;

[0033] Figure 6This is the third schematic diagram of the implementation structure of the air conditioner provided in the embodiments of this application;

[0034] Figure 7 This is one of the schematic diagrams of the control circuit provided in the embodiments of this application;

[0035] Figure 8 This is a second schematic diagram of the control circuit provided in the embodiments of this application;

[0036] Figure 9 This is the third schematic diagram of the control circuit provided in the embodiments of this application;

[0037] Figure 10 A schematic diagram illustrating the implementation structure of the control circuit provided in the embodiments of this application;

[0038] Figure 11 This is a schematic diagram of the implementation structure of the air conditioner provided in the embodiments of this application. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the specific technical solutions of this application will be further described in detail below with reference to the accompanying drawings of the embodiments of this application. The following embodiments are used to illustrate this application, but are not intended to limit the scope of this application.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0041] In the following description, references are made to “some embodiments,” which describe a subset of all possible embodiments. However, it is understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0042] It should be noted that the terms "first, second, third" used in the embodiments of this application are used to distinguish similar or different objects and do not represent a specific order of objects. It can be understood that "first, second, third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0043] This application provides an air conditioner in which the first contact of a relay is set in the connection circuit between a filter capacitor and a discharge resistor. This allows the control circuit to control the relay to disconnect the first contact when the air conditioner is powered on (i.e., when an input electrical signal is received at the signal input terminal), and to remain in the initial conducting state when no input electrical signal is received at the signal input terminal. This ensures that when the air conditioner is powered off, the relay continues to conduct the connection circuit between the discharge resistor and the filter capacitor, and when the air conditioner is powered on, the control circuit can control the relay to disconnect the connection circuit between the discharge resistor and the filter capacitor. This quickly dissipates the charge stored in the filter capacitor and reduces the operating power consumption of the air conditioner.

[0044] Figure 1 This is a schematic diagram of the structure of an air conditioner provided in an embodiment of this application. Figure 1 As shown, the air conditioner may include:

[0045] Signal input terminal 101 is configured to receive input electrical signals;

[0046] The filter capacitor 102 is connected to the signal input terminal 101 and is configured to filter out noise signals in the input electrical signal.

[0047] The discharge resistor 103 is connected to the filter capacitor 102 via a relay and is configured to consume the charge stored in the filter capacitor 102.

[0048] The relay includes a control terminal and a first contact 104. One end of the first contact 104 is connected to a discharge resistor 103, and the other end of the first contact 104 is connected to a filter capacitor 102, so that when the first contact 104 is in the on state, a circuit is formed between the discharge resistor 103 and the filter capacitor 102, and when the first contact 104 is in the off state, a circuit cannot be formed between the discharge resistor 103 and the filter capacitor 102.

[0049] The control circuit 105 has its power supply terminal connected to the signal input terminal 101 and its output terminal connected to the control terminal of the relay, so that when the control circuit 105 is operating normally according to the input electrical signal, it controls the relay to disconnect the first contact 104.

[0050] When the control circuit 105 is not operating normally, the relay is in the initial state, and in the initial state, the first contact 104 is in the conducting state.

[0051] During implementation, the relay is in the initial state by default. In this state, the first contact 104 is turned on by default. That is, before the control circuit 105 sends a control signal to the relay to indicate disconnection, the connection between the discharge resistor 103 and the filter capacitor 102 is always in the conducting state, so that the discharge resistor 103 can consume the charge stored in the filter capacitor 102, thereby realizing the rapid consumption of the charge stored in the filter capacitor 102 in the power-off state.

[0052] After the air conditioner is powered on, the controller 1052 operates normally. At this time, the controller 1052 sends a control signal to the relay to indicate disconnection. In turn, the relay disconnects the connection between the discharge resistor 103 and the filter capacitor 102, so that the discharge resistor 103 cannot consume the charge stored in the filter capacitor 102. At the same time, when the first contact 104 is disconnected, the connection between the discharge resistor 103 and the signal input terminal 101 is also disconnected. Therefore, the discharge resistor 103 cannot consume the input electrical signal, thereby reducing the operating power consumption of the air conditioner under normal operating conditions.

[0053] In some embodiments, since the first contact 104 needs to be in a conducting state in the initial state, the first contact 104 can be set as a normally closed contact of a relay, so that the first contact 104 can be turned on without the control circuit 105, reducing the dependence of the first contact 104 on the control circuit 105 and improving reliability.

[0054] In some embodiments, the signal input terminal 101 may include a first connection terminal and a second connection terminal, one end of the filter capacitor 102 is connected to the first connection terminal, and the other end of the filter capacitor 102 is connected to the second connection terminal, with the first connection terminal and the second connection terminal having different polarities.

[0055] For example, such as Figure 2 As shown, taking the first connection terminal as the live wire connection terminal L, the second connection terminal as the neutral wire connection terminal N, the filter capacitor 102 as capacitor C1, the discharge resistor 103 as resistor R1, and the first contact 104 including contact 1 and contact 2 as an example, capacitor C1 is connected to both the live wire connection terminal L and the neutral wire connection terminal N, resistor R1 is connected to contact 1, and capacitor C1 is connected to contact 2. Therefore, when no input electrical signal is received at the signal input terminal 101, relay K1 defaults to conducting contacts 1 and 2 to connect resistor R1 and capacitor C1. When an input electrical signal is received at the signal input terminal 101, the control circuit 105 operates normally after power-on, sending a control signal to relay K1 to control relay K1 to disconnect contacts 1 and 2, thereby disconnecting resistor R1 and capacitor C1 and preventing resistor R1 from consuming the AC signal input from the live wire connection terminal L.

[0056] It should be noted that this embodiment only illustrates a structural example of a signal input terminal 101 including two connection terminals, but the signal input terminal 101 may also include more than two connection terminals, such as a live wire connection terminal, a neutral wire connection terminal, and a ground wire connection terminal, etc. The specific configuration shall be made by those skilled in the art according to the actual situation, and this application embodiment does not impose any restrictions.

[0057] In some embodiments, the air conditioner may include a housing and a circuit board, with the circuit board disposed in the housing. The signal input terminal 101, filter capacitor 102, discharge resistor 103, relay and control circuit 105 are all disposed in the circuit board, thereby protecting the circuit board.

[0058] In one embodiment, such as Figure 3 As shown, the air conditioner also includes a thermistor 106. One end of the thermistor 106 is connected to the power supply terminal of the control circuit 105, and the other end of the thermistor 106 is connected to the signal input terminal 101, so that when the signal input terminal 101 receives an input electrical signal, the thermistor 106 transmits the input electrical signal to the control circuit 105.

[0059] It should be understood that when the power is turned on, the thermistor 106 can be used to limit the input current flowing to the control circuit 105. When the input current is larger, the thermistor 106 heats up more and the resistance is higher, thereby limiting the input current, protecting the devices in the control circuit 105, and thus improving the reliability of the circuit.

[0060] For example, such as Figure 4 As shown, based on Figure 2 The circuit structure shown takes the thermistor 106 as an example of resistor RT1. One end of resistor RT1 is connected to the live wire connection terminal L, and the other end of resistor RT1 is connected to the control circuit 105. Thus, when the live wire connection terminal L receives an input electrical signal, the input electrical signal is transmitted to the control circuit 105 through the thermistor 106.

[0061] In one embodiment, such as Figure 5 As shown, the relay also includes a second contact 107, which is connected in parallel with the thermistor 106, so as to control the second contact 107 to conduct when the control circuit 105 is operating normally according to the input electrical signal, so as to transmit the input electrical signal to the control circuit 105 through the second contact 107.

[0062] It should be understood that when the air conditioner is first powered on, i.e., in the soft-start stage, the control circuit 105 is in a non-working state and cannot determine whether the input electrical signal is abnormal. Therefore, during the soft-start stage, the input electrical signal needs to be transmitted through the thermistor 106. When the control circuit 105 operates normally according to the input electrical signal and determines that the input electrical signal is normal, it controls the second contact 107 to conduct, thereby directly transmitting the input electrical signal through the second contact 107. This avoids the thermistor 106 from continuing to consume the input electrical signal and reduces operating power consumption.

[0063] For example, such as Figure 6 As shown, taking the second contact 107, which includes contact 3 and contact 4, and the thermistor 106, which is resistor RT1, as an example, contact 3 is connected to one end of resistor RT1, and contact 4 is connected to the other end of resistor RT1. Thus, relay K1 can control contact 3 and contact 4 to conduct, so as to short-circuit resistor RT1 and directly transmit the input electrical signal to control circuit 105.

[0064] In some embodiments, the first contact 104 and the second contact 107 described above may be located in the same relay and controlled by the same relay, that is, the relay includes a double-pole double-throw switch, thereby reducing the number of components.

[0065] In other embodiments, the first contact 104 and the second contact 107 described above can be located in different relays, that is, the first contact 104 is located in the first relay and the second contact 107 is located in the second relay. Different relays control different contacts, which can control the two contacts separately and improve the switching reliability of the switch.

[0066] In one embodiment, the control circuit 105 can control the second contact 107 to be turned on and control the relay to be turned off in a preset sequence.

[0067] It should be understood that when the control circuit 105 controls the second contact 107 to be turned on, it sends a first control signal to the relay. When the control circuit 105 controls the first contact 104 to be turned off, it sends a second control signal to the relay. The first control signal and the second control signal can be different signals or the same signal. The specific settings can be made by those skilled in the art according to the actual situation. This application embodiment does not impose any restrictions.

[0068] The aforementioned preset sequence can be the order in which the control circuit 105 sends the first control signal and the second control signal, or it can be the order in which the relay executes the switching operation corresponding to the first control signal and the switching operation corresponding to the second control signal after receiving the first control signal and the second control signal. The specific sequence can be set by those skilled in the art according to the actual situation, and this application embodiment does not impose any restrictions.

[0069] When the first control signal and the second control signal are different signals, the relay can control the first contact 104 and the second contact 107 respectively. That is, the first contact 104 and the second contact 107 can be turned on or off at the same time, or they can not be turned on at the same time.

[0070] When the first control signal and the second control signal are the same signal, the relay itself cannot control the first contact 104 and the second contact 107 to be turned on or off at the same time. That is, the first contact 104 and the second contact 107 can only not be turned on at the same time.

[0071] In one embodiment, the first contact 104 is a normally closed contact and the second contact 107 is a normally open contact, thereby ensuring that the first contact 104 is in a conducting state in the initial state and the second contact 107 is in a disconnected state in the initial state, reducing the number of times the relay switches.

[0072] In one embodiment, such as Figure 7 As shown, the control circuit 105 includes a voltage conversion sub-circuit 1051 and a controller 1052. The output terminal of the voltage conversion sub-circuit 1051 is connected to the controller 1052, and the input terminal of the voltage conversion sub-circuit 1051 is connected to the signal input terminal 101, so as to convert the input electrical signal into a power supply electrical signal through the voltage conversion sub-circuit 1051 to supply power to the controller 1052.

[0073] The voltage conversion sub-circuit 1051 described above can adopt common technical means for performing voltage conversion functions in the art, such as switching power supply, DC-DC converter, etc. The specific settings can be made by those skilled in the art according to the actual situation, and the embodiments of this application do not impose any restrictions.

[0074] Preferably, the controller 1052 can be any processor with computing capabilities, such as a microprocessor (MPU), central processing unit (CPU), and single-chip microcomputer.

[0075] In one embodiment, such as Figure 8 As shown, the voltage conversion sub-circuit 1051 includes:

[0076] The rectifier unit 10511 has its input terminal connected to the signal input terminal 101 and its output terminal connected to the power conversion unit 10512 to convert the input electrical signal into a DC signal.

[0077] The power conversion unit 10512 has its input terminal connected to the output terminal of the rectifier unit 10511, and its output terminal connected to the controller 1052 to adjust the voltage of the DC signal and output the power supply signal.

[0078] The rectifier unit 10511 can convert the input electrical signal, which is an AC signal in this application, into a DC signal, and then the voltage is converted by the power conversion unit 10512. Thus, the voltage conversion process can be divided into a rectification part and a voltage conversion part, reducing the device requirements for the voltage conversion sub-circuit 1051.

[0079] In one embodiment, such as Figure 9 As shown, the rectifier unit 10511 includes:

[0080] The rectifier bridge 105111 has its input terminal connected to the signal input terminal 101 and its output terminal connected to the high-voltage energy storage element 105112 to rectify the input electrical signal and output the rectified electrical signal to the high-voltage energy storage element 105112.

[0081] High-voltage energy storage element 105112 is connected in parallel with power conversion unit 10512 to store the charge of rectified electrical signal and release the stored charge to power conversion unit 10512.

[0082] In some embodiments, the rectifier bridge 105111 can be a circuit commonly used in the art to implement AC to DC conversion, such as a full-bridge rectifier circuit and a half-bridge rectifier circuit. The specific configuration can be made by those skilled in the art according to the actual situation, and the embodiments of this application do not impose any restrictions.

[0083] In some embodiments, the high-voltage energy storage element 105112 can be a high-voltage electrolytic capacitor to meet the voltage conversion requirements of the air conditioner.

[0084] For example, such as Figure 10As shown, taking the high-voltage energy storage element 105112 as the electrolytic capacitor E1 and the rectifier bridge 105111 as the full-bridge rectifier circuit VC1 as an example, the input terminal of the rectifier circuit VC1 is connected to the signal input terminal 101, and the output terminal of the rectifier circuit VC1 is connected to both the electrolytic capacitor and the input terminal of the power conversion unit 10512. The output terminal of the power conversion unit 10512 is connected to the controller 1052. After the rectifier circuit VC1 converts the AC power to DC power, it uses the DC power to charge the electrolytic capacitor E1. The electrolytic capacitor E1 then outputs the stored charge to the power conversion unit 10512, so that the power conversion unit 10512 converts the received DC power into a power supply signal to power the controller 1052, so that the controller 1052 controls the relay to disconnect the first contact 104 and connect the second contact 107.

[0085] Figure 11 This is a schematic diagram illustrating an embodiment of an air conditioner provided in this application. Figure 11 As shown, the air conditioner may include a signal input terminal 101, a thermistor 106, a filter capacitor 102, a discharge resistor 103R1, a relay K1, and a control circuit 105. The control circuit 105 includes a rectifier unit 10511, a high-voltage energy storage element 105112, a power conversion unit 10512, and a controller 1052.

[0086] In this embodiment, the thermistor 106RT1 is a positive temperature coefficient (PTC) thermistor 106RT1. The signal input terminal 101 includes a live wire connection terminal L and a neutral wire connection terminal N. The filter capacitor 102C1 is connected to both the live wire connection terminal L and the neutral wire connection terminal N of the signal input terminal 101, respectively, to filter and absorb interference from the power input line. The discharge resistor 103 is a resistor R1, with one end connected to the live wire connection terminal L and the other end connected to the normally closed contact 5 of the relay K1. The filter capacitor 102 is a capacitor C1.

[0087] The PTC thermistor 106RT1 is connected between the live wire connection L and the rectifier bridge 105111VC1. When the power is initially turned on, it limits the charging current of the high-voltage electrolytic capacitor E1 through the rectifier bridge 105111VC1. The larger the charging current, the greater the heat generated by the PTC thermistor 106, resulting in a higher resistance, thus limiting the current.

[0088] Relay K1 has two sets of contacts. One set consists of normally open contacts 3 and 4, connected across the PTC thermistor 106RT1. The other set consists of normally closed contacts 5 and 6, connected between resistor R1 and the neutral terminal N. The relay is controlled by controller 1052. When there is no power, the normally closed contacts connect resistor R1 and the neutral terminal N, while the normally open contacts connected to the thermistor 106RT1 are open. When the power supply is normal, controller 1052 controls the relay to operate, opening the contacts connected between resistor R1 and the neutral terminal N, and closing the contacts connected across the PTC thermistor 106RT1.

[0089] The rectifier unit 10511 is a rectifier bridge 105111VC1. The rectifier bridge 105111VC1 rectifies the input AC power into DC power and outputs the DC power to the electrolytic capacitor E1.

[0090] The high-voltage energy storage element 105112 is a high-voltage electrolytic capacitor E1, which outputs the stored DC power to the power converter.

[0091] The power conversion unit 10512 is a power converter. One end of the power converter is connected to the high-voltage electrolytic capacitor E1, and the other end is connected to the controller 1052. It converts the high-voltage DC power (e.g., 300VDC) into low-voltage DC power (e.g., 5V and 12V) used by the controller 1052.

[0092] The controller 1052 is used to detect whether a user's power-on or power-off signal is received to determine whether the air conditioner needs to be turned on. When a power-on signal is detected, the controller controls the air conditioner to start running; when a power-off signal is received, the controller controls the air conditioner to enter standby mode. Simultaneously, the controller 1052 controls the state switching of relay K1.

[0093] The working principle of this air conditioner is explained in detail below.

[0094] After the air conditioner power plug is plugged in, the AC signal is input into the circuit through the live wire connection L and the neutral wire connection N. After passing through the filter capacitor C1, the output current is limited by the PTC thermistor RT1 and output to the rectifier bridge VC1. After rectification by the rectifier bridge VC1, the high-voltage DC power is stored in the high-voltage electrolytic capacitor E1. The power supply of the high-voltage electrolytic capacitor E1 is input to the power converter, and the power converter starts to work, outputting 5V and 12V power to the controller, and the controller starts to work.

[0095] Before the controller starts working, relay K1 does not receive a control signal. Its normally closed coil connected to resistor R1 is in the connected state, that is, the live wire connection terminal L can discharge resistor R1, and the normally closed coil is connected to the neutral wire connection terminal N to form an electrical circuit. Meanwhile, the normally open coil of relay K1 connected in parallel with the thermistor RT1 is in the open state, that is, the current cannot flow through the normally open coil, but can only flow through the PTC resistor RT1.

[0096] After the controller starts working, it sends a control signal to relay K1, causing the normally closed coil of relay K1 connected to resistor R1 to open. This prevents the live wire connection L from connecting to the neutral wire connection N through resistor R1, thus eliminating current flow and power loss in resistor R1. Simultaneously, the normally open coil of relay K1 connected to PTC resistor RT1 closes, allowing the power supply to be directly connected to the rectifier bridge VC1 through K1 without going through the thermistor RT1, reducing power consumption during operation.

[0097] After the power plug is unplugged, the controller loses power and cannot work. The relay K1 returns to its initial state before the controller started working, that is, the live wire connection L and resistor R1, the normally closed coil of relay K1 and the neutral wire connection N form an electrical circuit. In this way, the charge on the filter capacitor C1 can be quickly consumed through resistor R1 after the power plug is unplugged, and the voltage of capacitor C1 is quickly reduced to below 36V within 1 second.

[0098] In this embodiment, a relay's first contact is provided in the connection circuit between the discharge resistor and the filter capacitor. This allows the discharge resistor R1 to connect to the live wire connection L and the neutral wire connection N through the normally closed coil of the relay K1 only after the power plug is disconnected, forming a circuit with the filter capacitor C1 to consume the charge on C1. However, when the controller is working normally after power is applied, the discharge resistor R1 does not form a current circuit between the live wire connection L and the neutral wire connection N, thus avoiding power consumption and heat generation. This reduces operating power consumption and improves circuit safety.

[0099] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three kinds of relationships. For example, object A and / or object B can represent three situations: object A exists alone, object A and object B exist simultaneously, and object B exists alone.

[0100] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0101] The chips described above as separate components may or may not be physically separate. The components shown as chips may or may not be physical chips. They may be located in one place or distributed across multiple network units. Some or all of the chips may be selected to achieve the purpose of this embodiment according to actual needs.

[0102] The features disclosed in the several product embodiments provided in this application can be arbitrarily combined without conflict to obtain new product embodiments.

[0103] The above description is merely an embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An air conditioner, characterized in that, The air conditioner includes: chassis; A circuit board, disposed within the housing, comprises: The signal input terminal is configured to receive input electrical signals; A filter capacitor, connected to the signal input terminal, is configured to filter out noise signals in the input electrical signal; The discharge resistor, connected to the filter capacitor via a relay, is configured to consume the charge stored in the filter capacitor. The relay includes a control terminal and a first contact. One end of the first contact is connected to the discharge resistor, and the other end of the first contact is connected to the filter capacitor, so that when the first contact is in the on state, a circuit is formed between the discharge resistor and the filter capacitor, and when the first contact is in the off state, a circuit cannot be formed between the discharge resistor and the filter capacitor. A control circuit, wherein the power supply terminal of the control circuit is connected to the signal input terminal, and the output terminal of the control circuit is connected to the control terminal of the relay, so as to control the relay to disconnect the first contact when the control circuit is operating normally according to the input electrical signal; In the case where the control circuit is not operating normally, the relay is in an initial state, and in the initial state, the first contact is in the conducting state.

2. The air conditioner as described in claim 1, characterized in that, The air conditioner also includes a thermistor, one end of which is connected to the power supply terminal of the control circuit, and the other end of which is connected to the signal input terminal, so that when the signal input terminal receives the input electrical signal, the thermistor transmits the input electrical signal to the control circuit.

3. The air conditioner as described in claim 2, characterized in that, The relay further includes a second contact connected in parallel with the thermistor, so as to control the second contact to conduct when the control circuit is operating normally according to the input electrical signal, so as to transmit the input electrical signal to the control circuit through the second contact.

4. The air conditioner as described in claim 3, characterized in that, The control circuit controls the second contact to conduct in a preset sequence, and controls the relay to disconnect the first contact.

5. The air conditioner as described in claim 1, characterized in that, The control circuit includes a voltage conversion sub-circuit and a controller. The output terminal of the voltage conversion sub-circuit is connected to the controller, and the input terminal of the voltage conversion sub-circuit is connected to the signal input terminal, so as to convert the input electrical signal into a power supply signal through the voltage conversion sub-circuit to supply power to the controller.

6. The air conditioner as described in claim 5, characterized in that, The voltage conversion sub-circuit includes: A rectifier unit, wherein the input terminal of the rectifier unit is connected to the signal input terminal, and the output terminal of the rectifier unit is connected to the power conversion unit to convert the input electrical signal into a DC signal; A power conversion unit is provided, the input of which is connected to the output of the rectifier unit, and the output of which is connected to the controller, to adjust the voltage of the DC signal and output the power supply signal.

7. The air conditioner as described in claim 6, characterized in that, The rectifier unit includes: A rectifier bridge, wherein the input terminal of the rectifier bridge is connected to the signal input terminal, and the output terminal of the rectifier bridge is connected to the high-voltage energy storage element, so as to rectify the input electrical signal and output the rectified electrical signal to the high-voltage energy storage element; The high-voltage energy storage element is connected in parallel with the power conversion unit to store the charge of the rectified electrical signal and release the stored charge to the power conversion unit.

8. The air conditioner as described in claim 7, characterized in that, The high-voltage energy storage element is an electrolytic capacitor.

9. The air conditioner as described in claim 1, characterized in that, The signal input terminal includes a first connection terminal and a second connection terminal. One end of the filter capacitor is connected to the first connection terminal, and the other end of the filter capacitor is connected to the second connection terminal. The polarities of the first connection terminal and the second connection terminal are different.

10. The air conditioner as described in claim 3 or 4, characterized in that, The first contact is a normally closed contact, and the second contact is a normally open contact.

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