Operation protection circuit and air conditioner

Abstract

The utility model discloses an operation protection circuit and an air conditioner, and the operation protection circuit comprises a first switching tube; the output end of the level control circuit is connected with the controlled end of the first switching tube, and the level control circuit can control the first switching tube to be switched on or switched off; the switching circuit is used for detecting the inclination angle of the air conditioner and connecting or disconnecting the second power supply and the input end of the level control circuit according to the inclination angle; when the inclination angle is greater than a preset first reference angle, the switching circuit conducts the connection between the second power supply and the input end of the level control circuit, so that the second power supply is connected to the level control circuit; when a second power supply is connected, the level control circuit controls the first switching tube to be switched off so as to disconnect a current loop where the switch and the compressor are located; according to the technical scheme, permanent damage caused when the compressor runs under the condition that the air conditioner inclines is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioners, in particular to an operation protection circuit and an air conditioner. Background Art

[0002] For compressors, they are usually not allowed to be tilted during operation, because there are many precision parts inside the compressor, such as bearings, seals, etc. If they are tilted, it will cause wear and damage to these parts, which will affect the performance and life of the compressor. For mobile air conditioners, the working conditions of the air conditioner are uncertain during use, so the ground is not always smooth when moving. It is easy for the compressor to be permanently damaged because the user uses the mobile air conditioner on a tilted or uneven ground. Utility Model Content

[0003] The main purpose of the utility model is to provide an operation protection circuit and an air conditioner, aiming to prevent the compressor from running in a tilted state of the air conditioner, thereby causing permanent damage.

[0004] To achieve the above object, the operation protection circuit proposed by the utility model is applied to an air conditioner, wherein the air conditioner comprises a first compressor and a switch, wherein the compressor is connected to a power supply through the switch; the operation protection circuit comprises:

[0005] A first switch tube, connected in series between the switch and the ground;

[0006] A level control circuit, whose output end is connected to the controlled end of the first switch tube, and the level control circuit can control the conduction or disconnection of the first switch tube;

[0007] a switch circuit, whose input end is used to connect to the second power supply, and whose output end is connected to the input end of the level control circuit, wherein the switch circuit is used to detect the tilt angle of the air conditioner and to connect or disconnect the second power supply and the input end of the level control circuit according to the tilt angle;

[0008] When the tilt angle is greater than a preset first reference angle, the switch circuit switches on the connection between the second power supply and the input end of the level control circuit to connect the second power supply to the level control circuit;

[0009] When the second power supply is connected, the level control circuit controls the first switch tube to be turned off, so as to disconnect the current loop where the switch and the compressor are located.

[0010] In some embodiments, when the tilt angle of the air conditioner is less than the first reference angle, the switch circuit is also used to disconnect the second power supply from the level control circuit, and control the first switch tube to connect the current loop where the switch and the compressor are located.

[0011] In some embodiments, the level control circuit includes an energy storage capacitor, which is used to store the second power supply as electrical energy when the second power supply is connected, so that when the second power supply is disconnected, the first switch tube is maintained turned off by the level corresponding to the electrical energy.

[0012] In some embodiments, when the tilt angle is between the first reference angle and a preset second reference angle, the switch circuit repeatedly turns on and off the connection between the second power supply and the level control circuit; wherein the second reference angle is greater than the first reference angle;

[0013] When the level control circuit repeatedly connects to and stops connecting to the second power source, the level control circuit is also used to repeatedly store and discharge the electric energy to keep the first switch tube turned off.

[0014] In some embodiments, when the tilt angle is adjusted from being greater than a preset second reference angle to being less than the first reference angle, the switch circuit is further used to disconnect the second power supply from the level control circuit;

[0015] After the second power source is stored as electric energy, the level control circuit is further used to discharge the electric energy when the second power source is stopped from being connected, so as to control the delayed conduction of the first switch tube according to the level corresponding to the electric energy.

[0016] In some embodiments, the switch circuit comprises:

[0017] An angle switch, whose first power supply terminal is used to connect to the second power supply, and whose output terminal is the output terminal of the switch circuit;

[0018] A first resistor and a second resistor, wherein the first resistor is connected in series between the ground terminal of the angle switch and the ground, the first end of the second resistor is used to access the second power supply, and the second end of the second resistor is connected to the second power supply terminal of the angle switch.

[0019] In some embodiments, the level control circuit comprises:

[0020] A first diode, an anode of which is connected to the output end of the switch circuit;

[0021] a second diode and a third diode, wherein the anode of the second diode is connected to the cathode of the first diode, the cathode of the second diode is connected to the cathode of the third diode, and the anode of the third diode is grounded;

[0022] a third resistor, connected in series between the cathode of the first diode and the ground;

[0023] a fourth resistor and a fifth resistor, wherein a first end of the fourth resistor and a first end of the fifth resistor are respectively connected to the cathode of the first diode, a second end of the fourth resistor is connected to the controlled end of the first switch tube, and a second end of the fifth resistor is connected to the cathode of the second diode;

[0024] A first capacitor connected in series between the second end of the fifth resistor and the ground;

[0025] A second capacitor is connected in series between the cathode of the first diode and the ground.

[0026] In some embodiments, the operation protection circuit further includes:

[0027] A forced discharge circuit, whose input end is electrically connected to the level control circuit, whose output end is grounded, and whose controlled end is used to receive an external control signal; wherein the external control signal includes an external on signal and an external off signal;

[0028] The forced discharge circuit is used to conduct the output end of the level control circuit and the ground when receiving the external conduction signal to discharge the electric energy stored in the level control circuit; and to disconnect the output end of the level control circuit and the ground when receiving the external shutdown signal to stop discharging the level control circuit.

[0029] In some embodiments, the forced discharge circuit includes:

[0030] a sixth resistor, a first end of which is connected to the first end of the fifth resistor;

[0031] a seventh resistor, a first end of which is used to receive an external control signal;

[0032] A second switch tube, an input end of which is connected to the second end of the sixth resistor, a controlled end of which is connected to the second end of the seventh resistor, and an output end of which is grounded;

[0033] The fourth diode is connected in series between the first end of the first capacitor and the first end of the sixth resistor.

[0034] The utility model also provides an air conditioner, comprising a switch, a compressor and the above-mentioned operation protection circuit;

[0035] The switch includes a relay and a third switch tube, the first contact of the relay is used to connect to the first power supply, the second contact of the relay is connected to the power supply end of the compressor, the first end of the coil of the relay is used to connect to the second power supply, the second end of the coil is connected to the input end of the third switch tube, and the controlled end of the third switch tube is used to connect to an external enable signal;

[0036] The operation protection circuit is connected in series between the output end of the third switch tube and the ground.

[0037] The technical solution of the utility model connects the first switch tube in series between the switch and the ground, and can connect and disconnect the current loop where the switch and the compressor are located by turning the first switch tube on and off. Therefore, the first switch tube is used in combination with the switch circuit. When it is detected that the tilt angle of the air conditioner is greater than a preset first reference angle, the switch circuit can promptly control the first switch tube to disconnect the current loop where the switch and the compressor are located, thereby avoiding the compressor from running when the air conditioner is tilted, causing wear and damage to internal components, thereby affecting the performance and life of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0039] Figure 1 This is a structural diagram of an embodiment of the operation protection circuit of the utility model;

[0040] Figure 2 It is a structural schematic diagram of another embodiment of the operation protection circuit of the utility model;

[0041] Figure 3 This is a structural schematic diagram of an embodiment of an air conditioner of the utility model;

[0042] Figure 4 This is a circuit connection diagram of an embodiment of the operation protection circuit of the utility model;

[0043] Figure 5 This is a working diagram of the angle switch.

[0044] Description of Figure Numbers:

[0045] Label name Label name 110 Level control circuit U1 Angle switch 120 Switching Circuit Q1~Q3 The first switch tube to the third switch tube 130 Forced discharge circuit D1~D4 The first diode to the fourth diode 210 Relay C1~C2 First capacitor~Second capacitor 220 compressor R1~R7 The first resistor to the seventh resistor

[0046] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0048] In addition, in the present utility model, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0049] The utility model provides an operation protection circuit which is applied to an air conditioner. The air conditioner comprises a compressor and a switch. The compressor is connected to a first power supply through the switch.

[0050] Reference Figure 1 In one embodiment, the operation protection circuit includes:

[0051] A first switch tube Q1, connected in series between the switch and the ground;

[0052] A level control circuit 110, whose output end is connected to the controlled end of the first switch tube Q1, and the level control circuit 110 can control the on or off of the first switch tube Q1;

[0053] A switch circuit 120, whose input end is used to connect to the second power supply, and whose output end is connected to the input end of the level control circuit 110, wherein the switch circuit 120 is used to detect the tilt angle of the air conditioner and to turn on or off the connection between the second power supply and the input end of the level control circuit 110 according to the tilt angle;

[0054] When the tilt angle is greater than a preset first reference angle, the switch circuit 120 conducts the connection between the second power supply and the input end of the level control circuit 110 to connect the second power supply to the level control circuit 110;

[0055] When the second power source is connected, the level control circuit 110 controls the first switch tube Q1 to be turned off, so as to disconnect the current loop where the switch and the compressor are located.

[0056] In this embodiment, the first switch tube Q1 is a PMOS tube or a PNP transistor, the level control circuit 110 includes a resistor network composed of multiple resistors, and the switch circuit 120 may include an angle sensor, an angle switch U1 and other devices capable of detecting the tilt angle.

[0057] It can be understood that the first reference angle is set by the R&D personnel according to the performance of the compressor used in the air conditioner. When setting it, a margin is taken inward according to the maximum inclination angle at which the compressor can work normally. For example, when the maximum inclination angle at which the compressor can work normally is 15 degrees, the first reference angle can be set to 10 degrees, 12 degrees, etc.

[0058] Specifically, when the air conditioner is being moved and the switch circuit 120 detects that its tilt angle is greater than the first reference angle due to uneven road conditions, the switch circuit 120 connects the second power supply to the input end of the level control circuit 110, so that the level control circuit 110 can divide the connected second power supply through its internal resistor, and output a high-level control signal to the first switch tube Q1 through the divided voltage value. Since the first switch tube Q1 is a PMOS tube or a PNP-type triode, the first switch tube Q1 is turned off after receiving the high-level control signal, and the current loop where the switch and the compressor are located is disconnected. If the air conditioner is in operation at this time, the internal compressor will stop working immediately due to the power supply circuit being turned off; if the air conditioner is not in operation at this time, the internal compressor will not be able to start working due to the power supply circuit being turned off, thereby avoiding the compressor from running when the air conditioner is tilted, causing permanent damage.

[0059] Technical solution of the utility model The utility model connects the first switch tube Q1 in series between the switch and the ground, and can connect and disconnect the current loop where the switch and the compressor are located by turning the first switch tube Q1 on and off. Therefore, the first switch tube Q1 is used in combination with the switch circuit 120. When it is detected that the tilt angle of the air conditioner is greater than a preset first reference angle, the switch circuit 120 can promptly control the first switch tube Q1 to disconnect the current loop where the switch and the compressor are located, thereby avoiding the compressor from running when the air conditioner is tilted, causing wear and damage to internal components, thereby affecting the performance and life of the compressor.

[0060] Furthermore, when the tilt angle of the air conditioner is less than the first reference angle, the switch circuit 120 is also used to disconnect the second power supply from the level control circuit 110, and control the first switch tube Q1 to connect the current loop where the switch and the compressor are located.

[0061] In this embodiment, when the air conditioner is moved and the switch circuit 120 detects that its tilt angle is not greater than the first reference angle, the switch circuit 120 disconnects the second power supply from the input end of the level control circuit 110, so that the level control circuit 110 cannot divide the second power supply, and the controlled end of the first switch tube Q1 is pulled down to the ground by the resistor in the level control circuit 110. Since the first switch tube Q1 is a PMOS tube or a PNP type transistor, the first switch tube Q1 is turned on after receiving the low-level control signal, and the current loop where the switch and the compressor are located is connected. If the air conditioner is in operation at this time, the internal compressor can still work normally because the power supply circuit remains turned on; if the air conditioner is not in operation at this time, the internal compressor will start working immediately after receiving the external enable signal because the power supply circuit remains turned on.

[0062] Reference Figure 1 In one embodiment, the level control circuit 110 includes an energy storage capacitor. When the second power supply is connected, the energy storage capacitor is used to store the second power supply as electrical energy, so that when the second power supply is disconnected, the first switch tube Q1 is maintained turned off through the level corresponding to the electrical energy.

[0063] In this embodiment, an energy storage capacitor is further provided inside the level control circuit 110. When the level control circuit 110 is connected to a second power supply, the energy storage capacitor stores the second power supply as electrical energy, so that when the second power supply stops being connected, the stored electrical energy is discharged to maintain the off state of the first switch tube Q1 until the electrical energy discharge is completed.

[0064] In one embodiment, when the tilt angle is between the first reference angle and a preset second reference angle, the switch circuit 120 repeatedly turns on and off the connection between the second power supply and the level control circuit 110; wherein the second reference angle is greater than the first reference angle;

[0065] When the level control circuit 110 repeatedly connects to and stops connecting to the second power source, it is also used to repeatedly store and discharge the electric energy to keep the first switch tube Q1 turned off.

[0066] In this embodiment, if Figure 5As shown, when the angle sensor, angle switch U1 and other devices detect the angle, they usually have an output uncertain angle range between determining whether to turn on or off the second power supply, that is, the range between the first reference angle and the second reference angle, wherein the second reference angle is determined by the properties of the specific components of the switch circuit 120. For example, when the first reference angle is 10 degrees and the uncertainty range of the device is 5 degrees, the second reference angle is 15 degrees.

[0067] Within this range, the output of the switch circuit 120 will repeatedly turn on and off the second power supply, and since the level control circuit 110 is internally provided with an energy storage capacitor, when the switch circuit 120 turns on the second power supply, the level control circuit 110 will store the second power supply as electric energy, so that when the switch circuit 120 turns off the second power supply, the first switch tube Q1 is driven to turn off by using the stored electric energy, and the second power supply is stored again when the switch circuit 120 turns on the second power supply next time. Since the discharge time of the energy storage capacitor is longer than the time when the switch circuit 120 turns off the second power supply, the level control circuit 110 can use the repeated storage and discharge of the electric energy to keep the first switch tube Q1 turned off, thereby avoiding the switch circuit 120 from driving the level control circuit 110 to repeatedly turn on and off the first switch tube Q1 due to the uncertain output, which may cause damage to the compressor.

[0068] In another embodiment, when the tilt angle is adjusted from being greater than a preset second reference angle to being less than the first reference angle, the switch circuit 120 is further used to disconnect the second power supply from the level control circuit 110;

[0069] After the second power source is stored as electric energy, the level control circuit 110 is further used to discharge the electric energy when the second power source is stopped from being connected, so as to control the first switch tube Q1 to delay conduction according to the level corresponding to the electric energy.

[0070] In this embodiment, when the tilt angle is greater than the second reference angle, the switch circuit 120 turns on the second power supply, the level control circuit 110 stores the second power supply as electric energy, and drives the first switch tube Q1 to turn off. When the tilt angle changes from tilt to stability due to uncertain road conditions, so that the tilt angle is less than the first reference angle, the level control circuit 110 stops connecting to the second power supply, and the internal energy storage capacitor discharges the stored electric energy along the internal discharge circuit, and at the same time, the first switch tube Q1 is maintained in the off state by discharging the stored electric energy until the electric energy discharge is completed, so that the first switch tube Q1 is delayed to turn on, thereby avoiding the tilt angle to change rapidly when the road condition is unstable, so that the switch circuit 120 drives the level control circuit 110 to repeatedly turn on and off the first switch tube Q1, causing damage to the compressor.

[0071] Reference Figure 4 In one embodiment, the switch circuit 120 includes:

[0072] Angle switch U1, whose first power supply terminal is used to connect to the second power supply, and whose output terminal is the output terminal of the switch circuit 120;

[0073] A first resistor R1 and a second resistor R2, wherein the first resistor R1 is connected in series between the ground terminal of the angle switch U1 and the ground, the first end of the second resistor R2 is used to access the second power supply, and the second end of the second resistor R2 is connected to the second power supply terminal of the angle switch U1.

[0074] In this embodiment, the angle switch U1 includes a light-emitting side and a receiving side, the light-emitting side includes a first power supply terminal and a ground terminal, the receiving side includes a second power supply terminal and an output terminal, and a ball is also provided in the angle switch U1. When the air conditioner is moved, the light-emitting side is powered by the second power supply received by the first power supply terminal to maintain a light-emitting state. If the tilt angle of the air conditioner is greater than the first reference angle, the rolling angle of the ball is larger, so that the light on the light-emitting side can be received by the receiving side, and the second power supply terminal is connected to the output terminal, and the second power flows into the level control circuit 110; if the tilt angle of the air conditioner is less than the first reference angle, the rolling angle of the ball is smaller, the light on the light-emitting side is blocked, the receiving side does not receive the light, the second power supply terminal and the output terminal are turned off, and the second power cannot flow into the level control circuit 110.

[0075] Reference Figure 4 In one embodiment, the level control circuit 110 includes:

[0076] A first diode D1, an anode of which is connected to the output end of the switch circuit 120;

[0077] a second diode D2 and a third diode D3, wherein the anode of the second diode D2 is connected to the cathode of the first diode D1, the cathode of the second diode D2 is connected to the cathode of the third diode D3, and the anode of the third diode D3 is grounded;

[0078] A third resistor R3 is connected in series between the cathode of the first diode D1 and the ground;

[0079] a fourth resistor R4 and a fifth resistor R5, wherein a first end of the fourth resistor R4 and a first end of the fifth resistor R5 are respectively connected to the cathode of the first diode D1, a second end of the fourth resistor R4 is connected to the controlled end of the first switch tube Q1, and a second end of the fifth resistor R5 is connected to the cathode of the second diode D2;

[0080] A first capacitor C1 is connected in series between the second end of the fifth resistor R5 and the ground;

[0081] The second capacitor C2 is connected in series between the cathode of the first diode D1 and the ground.

[0082] In this embodiment, when the level control circuit 110 is connected to the second power supply, the second power supply flows along the first diode D1, the second diode D2, and along the first diode D1 and the fifth resistor R5 into the first capacitor C1, and the first capacitor C1 stores energy. At the same time, the voltage at the first end of the fifth resistor R5 provides a high-level control signal for the controlled end of the first switch tube Q1, so as to control the first switch tube Q1 to disconnect the current loop where the switch and the compressor are located.

[0083] When the level control circuit 110 is not connected to the second power supply, if the first capacitor C1 stores electric energy, the electric energy in the first capacitor C1 is discharged along the fifth resistor R5, the third resistor R3 and the ground. At the same time, during the discharge process, the voltage at the first end of the fifth resistor R5 provides a high-level control signal for the controlled end of the first switch tube Q1, controlling the first switch tube Q1 to disconnect the current loop where the switch and the compressor are located.

[0084] When the discharge is finished, or when the level control circuit 110 is not connected to the second power supply and the first capacitor C1 does not store electrical energy, no current flows through the fifth resistor R5. At this time, the controlled end of the first switch tube Q1 is pulled down to the ground by the third resistor R3, providing a low-level control signal to control the first switch tube Q1 to connect the current loop where the switch and the compressor are located.

[0085] Reference Figure 2 In one embodiment, the operation protection circuit further includes:

[0086] A forced discharge circuit 130, whose input end is electrically connected to the level control circuit 110, whose output end is grounded, and whose controlled end is used to receive an external control signal; wherein the external control signal includes an external on signal and an external off signal;

[0087] The forced discharge circuit 130 is used to conduct the output end of the level control circuit 110 and the ground to discharge the electric energy stored in the level control circuit 110 when receiving the external conduction signal; and to disconnect the output end of the level control circuit 110 and the ground to stop discharging the level control circuit 110 when receiving the external shutdown signal.

[0088] After receiving the second power supply, the level control circuit 110 adjusts from a second reference angle greater than a preset angle to a angle less than the first reference angle. It takes some time to discharge the stored electric energy. Only after the discharge is completed can the external enable signal normally drive the switch tube to control the operation of the compressor. This makes it impossible to use the air conditioner immediately after it is moved to the destination.

[0089] Therefore, in this embodiment, a forced discharge circuit 130 is provided. During the movement of the air conditioner, an external shutdown signal is output to the forced discharge circuit 130 to disconnect the output end of the circuit from the ground, so that the level control circuit 110 can normally perform tilt protection on the compressor and use the stored electric energy to maintain the shutdown state of the compressor, thereby preventing the compressor from being frequently started and shortening its life.

[0090] When the air conditioner stops moving and needs to be started, an external conduction signal is output to the forced discharge circuit 130, and the output end of the circuit is connected to the ground, so that the level control circuit 110 discharges the stored electric energy as soon as possible, so as to pull down the controlled end of the first switch tube Q1 as soon as possible. Therefore, the first switch tube Q1 is turned on after receiving the low-level control signal, and the current loop where the switch and the compressor are located is connected, so that the switch can immediately control the compressor to work when the external enable signal is input.

[0091] Reference Figure 2 and Figure 4 In one embodiment, the forced discharge circuit 130 includes:

[0092] a sixth resistor R6, a first end of which is connected to the first end of the fifth resistor R5;

[0093] A seventh resistor R7, a first end of which is used to receive an external control signal;

[0094] A second switch tube Q2, whose input end is connected to the second end of the sixth resistor R6, whose controlled end is connected to the second end of the seventh resistor R7, and whose output end is grounded;

[0095] The fourth diode D4 is connected in series between the first end of the first capacitor C1 and the first end of the sixth resistor R6.

[0096] In this embodiment, the second switch tube Q2 is a PNP transistor, so the external shutdown signal is a high level, and the external conduction signal is a low level.

[0097] When the external shutdown signal is connected, the second switch tube Q2 is turned off due to the high level received by the controlled end, and the first capacitor C1 cannot discharge to the ground through the fourth diode D4 and the sixth resistor R6. At this time, the level control circuit 110 normally performs tilt protection on the compressor, and the compressor is maintained in the shutdown state through the electric energy stored in the first capacitor C1.

[0098] When the external turn-on signal is connected, the second switch tube Q2 is turned on due to the low level received by the controlled end, and the first capacitor C1, the fourth diode D4, the sixth resistor R6 and the ground form a discharge loop to discharge the electric energy stored in the first capacitor C1 to pull down the controlled end of the first switch tube Q1 as soon as possible. Therefore, the first switch tube Q1 is turned on after receiving the low-level control signal, and the current loop where the switch and the compressor are located is connected.

[0099] Reference Figure 3 The utility model also provides an air conditioner, which includes a switch, a compressor 220 and an operation protection circuit, wherein the switch includes a relay 210 and a third switch tube Q3, wherein the first contact of the relay 210 is used to access the first power supply, the second contact of the relay 210 is connected to the power supply end of the compressor 220, the first end of the coil of the relay 210 is used to access the second power supply, the second end of the coil is connected to the input end of the third switch tube Q3, and the controlled end of the third switch tube Q3 is used to access an external enable signal;

[0100] The operation protection circuit is connected in series between the output end of the third switch tube Q3 and the ground.

[0101] In this embodiment, the external enable signal and the external control signal of the forced discharge circuit 130 are output by the same external control terminal. When the external control terminal outputs a high level, the third switch tube Q3 receives a high level enable signal, and the forced discharge circuit 130 receives a high level external shutdown signal. At this time, the operation of the compressor 220 is protected by the tilt protection circuit of the operation protection circuit; when the external control terminal outputs a low level, the third switch tube Q3 does not receive the enable signal, and the forced discharge circuit 130 receives a low level external conduction signal. At this time, the compressor 220 stops running because the third switch tube Q3 does not receive the enable signal, and the forced discharge circuit 130 forcibly discharges the electric energy stored in the level control circuit 110.

[0102] The specific structure of the operation protection circuit refers to the above embodiments. Since the air conditioner adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0103] The above description is only an optional embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. An operation protection circuit, applied to an air conditioner, the air conditioner comprising a compressor and a switch, the compressor being connected to a first power source via the switch; characterized in that: The operation protection circuit comprises: A first switch tube, connected in series between the switch and the ground; A level control circuit, whose output end is connected to the controlled end of the first switch tube, and the level control circuit can control the conduction or disconnection of the first switch tube; a switch circuit, whose input end is used to connect to the second power supply, and whose output end is connected to the input end of the level control circuit, wherein the switch circuit is used to detect the tilt angle of the air conditioner and to turn on or off the connection between the second power supply and the input end of the level control circuit according to the tilt angle; When the tilt angle is greater than a preset first reference angle, the switch circuit switches on the connection between the second power supply and the input end of the level control circuit to connect the second power supply to the level control circuit; When the second power supply is connected, the level control circuit controls the first switch tube to be turned off, so as to disconnect the current loop where the switch and the compressor are located.

2. The operation protection circuit according to claim 1, characterized in that: When the tilt angle of the air conditioner is less than the first reference angle, the switch circuit is also used to disconnect the second power supply from the level control circuit, and control the first switch tube to connect the current loop where the switch and the compressor are located.

3. The operation protection circuit according to claim 1, characterized in that: The level control circuit includes an energy storage capacitor. When the second power supply is connected, the energy storage capacitor is used to store the second power supply as electrical energy, so that when the second power supply is disconnected, the first switch tube is kept turned off by the level corresponding to the electrical energy.

4. The operation protection circuit according to claim 3, characterized in that: When the tilt angle is between the first reference angle and a preset second reference angle, the switch circuit repeatedly turns on and off the connection between the second power supply and the level control circuit; wherein the second reference angle is greater than the first reference angle; When the level control circuit repeatedly connects to and stops connecting to the second power source, the level control circuit is also used to repeatedly store and discharge the electric energy to keep the first switch tube turned off.

5. The operation protection circuit according to claim 3, characterized in that: When the tilt angle is adjusted from being greater than a preset second reference angle to being less than the first reference angle, the switch circuit is further used to disconnect the second power supply from the level control circuit; After the second power source is stored as electric energy, the level control circuit is further used to discharge the electric energy when the second power source is stopped from being connected, so as to control the delayed conduction of the first switch tube according to the level corresponding to the electric energy.

6. The operation protection circuit according to claim 1, characterized in that: The switch circuit comprises: An angle switch, whose first power supply terminal is used to connect to the second power supply, and whose output terminal is the output terminal of the switch circuit; A first resistor and a second resistor, wherein the first resistor is connected in series between the ground terminal of the angle switch and the ground, the first end of the second resistor is used to access the second power supply, and the second end of the second resistor is connected to the second power supply terminal of the angle switch.

7. The operation protection circuit according to claim 1, characterized in that: The level control circuit comprises: A first diode, an anode of which is connected to the output end of the switch circuit; a second diode and a third diode, wherein the anode of the second diode is connected to the cathode of the first diode, the cathode of the second diode is connected to the cathode of the third diode, and the anode of the third diode is grounded; a third resistor, connected in series between the cathode of the first diode and the ground; a fourth resistor and a fifth resistor, wherein a first end of the fourth resistor and a first end of the fifth resistor are respectively connected to the cathode of the first diode, a second end of the fourth resistor is connected to the controlled end of the first switch tube, and a second end of the fifth resistor is connected to the cathode of the second diode; A first capacitor connected in series between the second end of the fifth resistor and the ground; A second capacitor is connected in series between the cathode of the first diode and the ground.

8. The operation protection circuit according to claim 7, characterized in that: The operation protection circuit also includes: A forced discharge circuit, whose input end is electrically connected to the level control circuit, whose output end is grounded, and whose controlled end is used to receive an external control signal; wherein the external control signal includes an external on signal and an external off signal; The forced discharge circuit is used to conduct the output end of the level control circuit and the ground when receiving the external conduction signal to discharge the electric energy stored in the level control circuit; and to disconnect the output end of the level control circuit and the ground when receiving the external shutdown signal to stop discharging the level control circuit.

9. The operation protection circuit according to claim 8, characterized in that: The forced discharge circuit comprises: a sixth resistor, a first end of which is connected to the first end of the fifth resistor; a seventh resistor, a first end of which is used to receive an external control signal; A second switch tube, an input end of which is connected to the second end of the sixth resistor, a controlled end of which is connected to the second end of the seventh resistor, and an output end of which is grounded; The fourth diode is connected in series between the first end of the first capacitor and the first end of the sixth resistor.

10. An air conditioner, characterized in that: It comprises a switch, a compressor and an operation protection circuit as claimed in any one of claims 1 to 9; The switch includes a relay and a third switch tube, the first contact of the relay is used to connect to the first power supply, the second contact of the relay is connected to the power supply end of the compressor, the first end of the coil of the relay is used to connect to the second power supply, the second end of the coil is connected to the input end of the third switch tube, and the controlled end of the third switch tube is used to connect to an external enable signal; The operation protection circuit is connected in series between the output end of the third switch tube and the ground.

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