CN212380933U - Protection circuit, control panel and air conditioner of air conditioner - Google Patents
Protection circuit, control panel and air conditioner of air conditioner Download PDFInfo
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- CN212380933U CN212380933U CN202020888694.8U CN202020888694U CN212380933U CN 212380933 U CN212380933 U CN 212380933U CN 202020888694 U CN202020888694 U CN 202020888694U CN 212380933 U CN212380933 U CN 212380933U
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Abstract
The utility model provides a protection circuit, a control panel and an air conditioner of an air conditioner, wherein the protection circuit comprises a first fuse, a standby circuit and a voltage detection circuit, and the standby circuit comprises a second fuse and a voltage drop element; the voltage drop element is connected with the first fuse in parallel, and the power input end can be connected with the internal circuit through the voltage drop element when the first fuse is broken; when voltage is unusual, voltage detection circuit can control the second fuse and insert, makes power input end pass through second fuse and internal circuit connection. The utility model provides a scheme can be in the air conditioner the protective tube burn out the back normal work of recovering by oneself, need not the maintenance of going to the door, does not influence user's normal use.
Description
Technical Field
The utility model relates to an air conditioner technical field particularly, relates to a protection circuit, control panel and air conditioner of air conditioner.
Background
In order to protect the control panel of the air conditioner, a fuse is generally connected to a strong current input end of the control panel. When the external power supply is abnormal, other important devices in the control panel can be prevented from being damaged in a mode that the fuse tube is burnt. With the popularization of high-power electrical appliances in households, the situations that a plurality of high-power electrical appliances are used at the same time are increased, the high load of a power grid is more easily generated, the harmonic waves or voltage abnormality of the power grid is caused, and the probability of burning out the fuse tube is greatly increased correspondingly.
However, once the fuse is burnt out, the fuse needs to be repaired, and the normal use of the air conditioner is affected.
SUMMERY OF THE UTILITY MODEL
The utility model provides a problem need the maintenance of going to the door after the protective tube burns out, influences the problem of the normal use of air conditioner.
In order to solve the above problem, the embodiment of the present invention is implemented as follows:
the embodiment of the utility model provides a protection circuit of air conditioner, including first fuse, stand-by circuit and voltage detection circuit, the stand-by circuit includes second fuse and voltage drop component; the first end of the first fuse is connected with the power input end, and the second end of the first fuse is connected with the internal circuit; the voltage drop element is connected with the first fuse in parallel and is used for communicating the power supply input end with the internal circuit when the first fuse is broken; the voltage detection circuit is respectively connected with the second end of the first fuse and the standby circuit and used for detecting the voltage of the second end, and when the voltage is in a preset fuse breaking voltage range, the second fuse is controlled to be connected, so that the power input end passes through the second fuse and the internal circuit is connected.
The embodiment provides a protection circuit of an air conditioner, which can connect a power input end and an internal circuit through a voltage drop element when a first fuse of the air conditioner is broken, so as to keep supplying power; the voltage detection circuit can detect voltage abnormity and accesses the second fuse into the circuit, and the power input end and the internal circuit are connected through the second fuse, so that the air conditioner recovers to work normally without influencing normal use of users.
Optionally, the backup circuit further comprises a controllable switching element; the second fuse and the controllable switching element are connected in series and then connected in parallel with the first fuse; and the voltage detection circuit is used for controlling the controllable switch element to be conducted when the voltage is within the preset fuse breaking voltage range, so that the second fuse is connected.
In this embodiment, the voltage detection circuit may turn on the second fuse through the controllable switch element, so that the air conditioner may resume normal operation without affecting the use of the user.
Optionally, the voltage detection circuit includes a rectification circuit, a voltage division circuit and a controller connected in sequence; the controller is used for detecting the voltage of the second end and controlling the second fuse to be connected when the voltage is within the preset fuse breaking voltage range.
In the embodiment, the controller is used for detecting the voltage and judging whether the voltage is abnormal or not, so that the second fuse is controlled to enable the air conditioner to recover to work normally, and the use of a user is not influenced.
Optionally, the standby circuit further comprises a control chip; the control chip is respectively connected with the voltage detection circuit and the controllable switch element and is used for responding to a control signal of the controller to control the controllable switch element to be conducted.
In this embodiment, the second fuse is controlled to be connected through the control chip, so that the air conditioner can resume normal operation without affecting the use of a user.
Optionally, the standby circuit further comprises a switch control circuit; the switch control circuit is respectively connected with the voltage detection circuit and the controllable switch element and is used for responding to a control signal of the controller to control the controllable switch element to be conducted.
In this embodiment, the switch control circuit controls the second fuse to be connected, so that the air conditioner can resume normal operation without affecting the use of users.
Optionally, the switch control circuit includes a triode, a base of the triode is connected to the voltage detection circuit, a collector of the triode is connected to the controllable switch element, and an emitter of the triode is grounded.
In this embodiment, the switching function based on the triode controls the second fuse to be connected, so that the air conditioner can recover to work normally.
Optionally, the controllable switching element is a relay, a triode, or a field effect transistor.
In the embodiment, the second fuse is controlled to be connected based on the switching function of the relay, the triode or the field effect transistor, so that the air conditioner can recover to work normally.
Optionally, the voltage drop element is a resistor.
In this embodiment, the voltage detection circuit detects whether the abnormality occurs based on the voltage reduction effect of the resistor.
An embodiment of the utility model provides a control panel of air conditioner, include: the protection circuit of internal circuit and above-mentioned air conditioner, the internal circuit passes through the protection circuit connects the power.
An embodiment of the utility model provides an air conditioner, control panel including above-mentioned air conditioner.
The utility model discloses control panel, the air conditioner of air conditioner can reach the same technological effect with the protection circuit of above-mentioned air conditioner.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a block diagram of a protection circuit of an air conditioner according to an embodiment of the present invention;
fig. 2 is a block diagram of a protection circuit of another air conditioner according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a protection circuit of an air conditioner according to an embodiment of the present invention;
fig. 4 is a circuit diagram of another protection circuit of an air conditioner according to an embodiment of the present invention.
Description of reference numerals:
10-an external power supply; 20-a first fuse; 30-a standby circuit; 40-a voltage detection circuit; 50-internal circuitry; 301-a second fuse; 302-a pressure drop element; 303-a controllable switching element; an AC-L-phase line; an AC-N-neutral line; FUSE1 — first safety tube; FUSE 2-second FUSE tube; RY 1-relay; MCU-controller; BG 1-rectifier circuit; r1 — first resistance; r2 — second resistance; r3 — third resistance; r4-fourth resistor; q1-triode; d1 — first diode; d2-second diode.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 is a block diagram of a protection circuit of an air conditioner in this embodiment. As shown in fig. 1, the protection circuit of the air conditioner includes a first fuse 20, a standby circuit 30, and a voltage detection circuit 40, and the standby circuit 30 includes a second fuse 301 and a voltage drop element 302.
A first end of the first fuse 20 is connected to a power input terminal connected to the external power source 10; the second terminal of the first fuse 20 is connected to the internal circuit 50; the voltage drop element 302 is connected in parallel with the first fuse 20 for connecting the power input terminal to the internal circuit 50 when the first fuse 20 is open.
The voltage detection circuit 40 is connected to the second terminal of the first fuse 20 and the standby circuit 30, respectively, and is configured to detect a voltage at the second terminal of the first fuse 20, and when the voltage is within a predetermined fuse disconnection voltage range, it indicates that the first fuse 20 is disconnected, and control the second fuse 301 to be connected, so that the power input terminal is connected to the internal circuit 50 through the second fuse 301.
The voltage drop element 302 is connected in parallel with the first fuse 20, and has a resistance much larger than that of the first fuse 20. When the first fuse 20 is operating normally, the voltage drop element 302 is short-circuited by the first fuse 20; when the first fuse 20 is disconnected, typically due to an abnormal power supply condition of the external power source 10, causing the first fuse 20 to burn out, the voltage drop element 302 may communicate the external power source 10 and the internal circuit 50. In this case, the power input terminal is connected to the internal circuit 50 through the voltage drop element 302, which can ensure that power is continuously supplied to the control board of the air conditioner. Specifically, the voltage drop element 302 may be a resistor, a diode, or the like having a certain resistance.
The voltage detection circuit 40 may continuously detect the ac voltage at the second end of the first fuse 20, and when the first fuse 20 is open, the voltage drop element 302 is connected between the external power source 10 and the internal circuit 50, and since the resistance of the voltage drop element 302 itself is much greater than that of the first fuse 20, the ac voltage at the second end of the first fuse 20, which may be detected by the voltage detection circuit 40, changes. By reasonably setting the preset fuse open-circuit voltage range, it is possible to determine whether the first fuse 20 is open and the voltage drop element 302 is connected by determining whether the ac voltage at the second end is within the fuse open-circuit voltage range. If this occurs, a switching operation is performed to turn on the branch where the second fuse 301 is located, to switch the second fuse 301 into the circuit, and to connect the power input terminal to the internal circuit 50 through the second fuse 301. Because the resistance of the voltage drop element 302 is also much greater than that of the second fuse 301, the switching operation causes the voltage drop element 302 to be short-circuited again, and the current enters the internal circuit 50 through the second fuse 301 to recover the normal protection function again, thereby achieving the purpose of continuous and normal operation of the air conditioner.
The protection circuit of the air conditioner of the embodiment can connect the power input end and the internal circuit through the voltage drop element when the first fuse of the air conditioner is broken, so as to keep supplying power; the voltage detection circuit can detect voltage abnormity and connect the second fuse into the circuit, and the power input end and the internal circuit are connected through the second fuse, so that the air conditioner can be recovered to work normally, normal use of a user is not affected, maintenance scenes of the air conditioner are greatly reduced, the circuit is simple, and the popularization is strong.
Fig. 2 is another block diagram of the protection circuit of the air conditioner in this embodiment. As shown in fig. 2, the standby circuit 30 may further comprise a controllable switching element 303; the second fuse 301 is connected in series with the controllable switching element 303, both of which are connected in parallel with the first fuse 20. Specifically, the controllable switching element 303 may be an element having a switching function, such as a relay, a transistor, or a field effect transistor.
In case the first fuse 20 is operating normally, the controllable switching element 303 is in an open state. When the voltage detection circuit 40 detects that the voltage is within the fuse cutoff voltage range, the controllable switching element 303 is controlled to be turned on to switch the second fuse 301 in, so that the power input terminal is connected to the internal circuit 50 through the second fuse 301. Therefore, the air conditioner can be restored to normal operation without the need for maintenance when the first fuse 20 is burned out by controlling the conduction of the controllable switching element 303.
Alternatively, the voltage detection circuit 40 may include a rectification circuit, a voltage division circuit, and a controller connected in sequence, and the controller may detect the voltage at the second terminal of the first fuse 20 and control the second fuse 301 to be connected when the voltage is within the fuse cutoff voltage range. The rectifying circuit firstly rectifies the alternating current, then the voltage dividing circuit divides the rectified voltage, and the voltage is input into the controller for voltage detection and judgment, and whether the detected voltage is in the fuse cut-off voltage range is determined so as to determine whether to execute the action of controlling the connection of the second fuse 301. The controller may be a MicrocontrollerUnit (MCU).
In one embodiment, the standby circuit 30 may further include a control chip, which may be connected to the voltage detection circuit 40 and the controllable switch element 303, respectively, and may receive a control signal from the controller, and in response to the control signal, control the controllable switch element 303 to be turned on, so as to switch in the second fuse 301.
In another embodiment, the standby circuit 30 may further include a switch control circuit, which is connected to the voltage detection circuit 40 and the controllable switch element 303, respectively, and is capable of receiving the control signal of the controller and controlling the controllable switch element 303 to be turned on in response to the control signal, so as to switch in the second fuse 301. Specifically, the switch control circuit may include a transistor, a base of the transistor is connected to the voltage detection circuit 40, a collector of the transistor is connected to the controllable switch element 303, and an emitter of the transistor is grounded. When the base of the triode receives the control signal of the controller, the controllable switch element 303 is caused to be conducted, so that the second fuse 301 is connected.
Fig. 3 is a circuit diagram of a protection circuit of an air conditioner in the present embodiment, showing one implementation of the protection circuit of the air conditioner in the present embodiment, including a first fuse 20, a backup circuit 30, and a voltage detection circuit 40. In fig. 3, the external power source includes phase AC-L and neutral AC-N lines, the first FUSE is a first FUSE1, the second FUSE is a second FUSE2, the voltage dropping element is a third resistor R3, the controllable switching element is a relay RY1, and the controller is an MCU. In fig. 3, the standby circuit includes one FUSE as an example, and it is understood that a plurality of FUSEs may be included in the standby circuit, and each FUSE may be connected in series with a relay and then connected in parallel with the first FUSE 1.
The third resistor R3 is connected in parallel with the first FUSE tube FUSE1, and the second FUSE tube FUSE2 is connected in series with the relay RY1 and then connected in parallel with the first FUSE tube FUSE 1. In fig. 3, the voltage detection circuit includes a voltage division circuit composed of a rectifier circuit BG1, a first resistor R1, and a second resistor R2. The MCU is connected between the first resistor R1 and the second resistor R2 and used for detecting voltage. The control chip included in the standby circuit takes a 2003 chip as an example, the MCU is connected to the 2003 chip, and the 2003 chip is connected to the relay RY 1. The MCU can send a control signal to the 2003 chip, and the relay RY1 is controlled by the 2003 chip to pull in, so that the third resistor R3 is short-circuited and the second FUSE FUSE2 is connected. Relay RY1 is also connected to a 12V operating voltage.
When the air conditioner normally operates, the first FUSE1 keeps a direct connection state, alternating current is subjected to half-wave rectification through the rectification circuit BG1, then enters the MCU after being divided by the first resistor R1 and the second resistor R2, and voltage detection is performed by the MCU. The MCU can continuously detect the alternating voltage, compares the detected voltage with a preset fuse open circuit voltage range, and does not execute switching action when the alternating voltage value is not in the fuse open circuit voltage range, which indicates that the air conditioner is in a normal working state. In the present embodiment, the voltage range may be represented by a threshold voltage, and the fuse-off voltage range may be determined to be smaller than the threshold voltage.
Specifically, the threshold voltage may be determined based on a voltage value between the first resistor R1 and the second resistor R2 when the third resistor R3 is connected into the circuit. Since the first voltage value between the first resistor R1 and the second resistor R2 is smaller than the second voltage value in the FUSE1 through state when the third resistor R3 is connected, the threshold voltage may be set to the second voltage, or a voltage value smaller than the second voltage.
When the first FUSE1 is burned out due to power grid abnormality, the first FUSE1 is disconnected, no current flows through, and the third resistor R3 connected in parallel to the two ends of the first FUSE1 is connected to the circuit, so that the circuit can be ensured to continue to operate. At this time, the voltage detected by the MCU changes, the detected voltage is compared with the threshold voltage, and the standby circuit switching operation is started when the detected voltage is found to be lower than the threshold voltage.
When the standby circuit 30 executes the switching action, the MCU sends a control instruction to the 2003 chip, and drives the relay RY1 to pull in the 2003 chip, so as to connect the second FUSE2 and short the third resistor R3, and at this time, the current will flow through the second FUSE2, thereby recovering the protected state of the control board of the air conditioner, ensuring the normal operation of the control board, and further realizing the continuous normal operation of the air conditioner. Therefore, the air conditioner can recover automatically when the first FUSE1 is burnt out, the normal use of a user is not affected, and the air conditioner maintenance scenes are greatly reduced.
Fig. 4 is a circuit diagram of a protection circuit of the air conditioner in this embodiment, showing another implementation of the protection circuit of the air conditioner in this embodiment. Unlike the protection circuit shown in fig. 3 described above, the voltage detection circuit 40 shown in fig. 4 controls the relay RY1 through the switch control circuit. The switch control circuit comprises a fourth resistor R4, a triode Q1, a first diode D1 and a second diode D2; the base electrode of the triode Q1 is connected with the MCU through a fourth resistor R4, the collector electrode of the triode Q1 is connected with the relay RY1, and the emitting electrode of the triode Q1 is grounded; the first diode D1 and the second diode D2 are connected with the relay RY1 in parallel and are used for protecting the MCU and the triode Q1 from being damaged.
When the standby circuit executes the switching action, a control command sent by the MCU reaches the triode Q1 through the fourth resistor R4, then the relay RY1 is driven to suck, the second FUSE FUSE2 is switched on to short-circuit the third resistor R3, and at the moment, the current flows through the second FUSE FUSE2, so that the protected state of the control panel of the air conditioner is recovered, and the control panel can normally work.
The embodiment also provides a control panel of the air conditioner, which comprises an internal circuit and the protection circuit of any one of the air conditioners, wherein the internal circuit is connected with a power supply through the protection circuit. The control panel of the air conditioner of this embodiment has increased protection circuit, can keep supplying power through the voltage drop component when the first fuse of air conditioner breaks circuit to with second fuse access circuit, connect power input end and inner circuit through the second fuse, thereby make the air conditioner resume normal work, do not influence user's normal use.
The embodiment also provides an air conditioner, which comprises the control panel of any one of the air conditioners. The air conditioner of this embodiment has increased protection circuit on the control panel, can be when first fuse opens circuit, connects power input end and internal circuit through the second fuse to make the air conditioner resume normal work, do not influence user's normal use.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the scope or spirit of the present invention, and the scope of the present invention is defined by the appended claims.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The protection circuit of the air conditioner is characterized by comprising a first fuse, a standby circuit and a voltage detection circuit, wherein the standby circuit comprises a second fuse and a voltage drop element;
the first end of the first fuse is connected with the power input end, and the second end of the first fuse is connected with the internal circuit;
the voltage drop element is connected with the first fuse in parallel and is used for communicating the power supply input end with the internal circuit when the first fuse is broken;
the voltage detection circuit is respectively connected with the second end of the first fuse and the standby circuit and used for detecting the voltage of the second end, and when the voltage is in a preset fuse breaking voltage range, the second fuse is controlled to be connected, so that the power input end passes through the second fuse and the internal circuit is connected.
2. The protection circuit of an air conditioner according to claim 1, wherein the standby circuit further comprises a controllable switching element;
the second fuse and the controllable switching element are connected in series and then connected in parallel with the first fuse;
and the voltage detection circuit is used for controlling the controllable switch element to be conducted when the voltage is within the preset fuse breaking voltage range, so that the second fuse is connected.
3. The protection circuit of an air conditioner according to claim 2, wherein the voltage detection circuit comprises a rectification circuit, a voltage division circuit and a controller which are connected in sequence;
the controller is used for detecting the voltage of the second end and controlling the second fuse to be connected when the voltage is within the preset fuse breaking voltage range.
4. The protection circuit of an air conditioner according to claim 3, wherein the standby circuit further comprises a control chip;
the control chip is respectively connected with the voltage detection circuit and the controllable switch element and is used for responding to a control signal of the controller to control the controllable switch element to be conducted.
5. The protection circuit of an air conditioner according to claim 3, wherein the standby circuit further comprises a switching control circuit;
the switch control circuit is respectively connected with the voltage detection circuit and the controllable switch element and is used for responding to a control signal of the controller to control the controllable switch element to be conducted.
6. The protection circuit of claim 5, wherein the switching control circuit comprises a transistor, a base of the transistor is connected to the voltage detection circuit, a collector of the transistor is connected to the controllable switching element, and an emitter of the transistor is grounded.
7. The protection circuit of an air conditioner according to any one of claims 2 to 6, wherein the controllable switching element is a relay, a triode, or a field effect transistor.
8. The protection circuit of an air conditioner according to any one of claims 1 to 6, wherein the voltage drop element is a resistor.
9. A control panel for an air conditioner, comprising: an internal circuit and the protection circuit of the air conditioner of any one of claims 1 to 8, the internal circuit being connected to a power source through the protection circuit.
10. An air conditioner characterized by comprising the control panel of the air conditioner of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020888694.8U CN212380933U (en) | 2020-05-25 | 2020-05-25 | Protection circuit, control panel and air conditioner of air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020888694.8U CN212380933U (en) | 2020-05-25 | 2020-05-25 | Protection circuit, control panel and air conditioner of air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212380933U true CN212380933U (en) | 2021-01-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020888694.8U Active CN212380933U (en) | 2020-05-25 | 2020-05-25 | Protection circuit, control panel and air conditioner of air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212380933U (en) |
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2020
- 2020-05-25 CN CN202020888694.8U patent/CN212380933U/en active Active
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Effective date of registration: 20221019 Address after: 315191 No. 1166 Mingguang North Road, Jiangshan Town, Ningbo, Zhejiang, Yinzhou District Patentee after: NINGBO AUX ELECTRIC Co.,Ltd. Patentee after: AUX AIR CONDITIONING LIMITED BY SHARE Ltd. Address before: 315191 No. 1166 Mingguang North Road, Jiangshan Town, Ningbo, Zhejiang, Yinzhou District Patentee before: NINGBO AUX ELECTRIC Co.,Ltd. Patentee before: Ningbo Oxfam intelligent commercial air conditioning manufacturing Co.,Ltd. |