Electrostatic protection circuit and air conditioner

Abstract

The utility model discloses an electrostatic protection circuit and an air conditioner, and the electrostatic protection circuit comprises a primary discharge sub-circuit which is provided with a plurality of first input ends, the plurality of first input ends are respectively used for being electrically connected with a plurality of output ends of a microphone group in a one-to-one correspondence manner, the output end of the primary discharge sub-circuit is grounded, and the output end of the primary discharge sub-circuit is grounded. The primary discharge sub-circuit is used for performing discharge processing on external static electricity accessed to the microphone group; the buffer sub-circuit is connected in series between the plurality of output ends of the microphone group and the control chip so as to carry out current limiting processing on the discharged external static electricity; the secondary discharge sub-circuit is provided with a plurality of second input ends, the plurality of second input ends are respectively used for being electrically connected with the control chip and being connected with the plurality of output ends of the buffer sub-circuit in a one-to-one correspondence manner, the output ends of the secondary discharge sub-circuit are grounded, and the secondary discharge sub-circuit is used for discharging the external static electricity after current limiting; the technical scheme of the utility model aims to prevent the chip from being damaged due to too high accessed electrostatic voltage.

Description

Technical Field

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

[0002] At present, with the rapid development of the air-conditioning industry, voice control has gradually replaced the remote control of traditional air conditioners, greatly improving the user experience. However, voice air conditioners use a microphone group to pick up sound and convert digital signals into analog signals for chip recognition. In order to ensure the voice recognition rate, the microphone group needs to have holes opened, which makes it easy for static electricity to enter the microphone group. Once static electricity enters the microphone group, the excessively high static voltage will damage the chip, which in turn causes the entire voice system to malfunction. Utility Model Content

[0003] The main purpose of the utility model is to provide an electrostatic protection circuit and an air conditioner, aiming to prevent the chip from being damaged by an excessively high electrostatic voltage.

[0004] To achieve the above object, the electrostatic protection circuit proposed by the utility model is applied to an air conditioner, the air conditioner includes a control chip and a microphone group with multiple output terminals, and the electrostatic protection circuit includes:

[0005] A primary discharge subcircuit has a plurality of first input terminals, each of which is electrically connected to a plurality of output terminals of the microphone group in a one-to-one correspondence, and the output terminal of the primary discharge subcircuit is grounded. The primary discharge subcircuit is used to discharge external static electricity connected to the microphone group;

[0006] A buffer subcircuit, connected in series between the multiple output terminals of the microphone group and the control chip, to limit the current of the discharged external static electricity;

[0007] The secondary discharge sub-circuit has multiple second input terminals, which are respectively used to be electrically connected to the control chip and connected one-to-one with multiple output terminals of the buffer sub-circuit. The output terminal of the secondary discharge sub-circuit is grounded, and the secondary discharge sub-circuit is used to discharge the external static electricity after current limiting.

[0008] In some embodiments, the primary discharge subcircuit comprises:

[0009] A plurality of primary discharge branches are respectively connected in series between a plurality of output terminals of the microphone group and the ground, and each of the primary discharge branches is used for discharging external static electricity connected to the output terminal of the corresponding microphone group.

[0010] In some embodiments, the primary discharge branch comprises:

[0011] a first electrostatic tube, wherein a first end of the first electrostatic tube is used to connect to an output end of the microphone group;

[0012] A first resistor is connected in series between the second end of the first electrostatic tube and the ground.

[0013] In some embodiments, the buffer subcircuit comprises:

[0014] A plurality of second resistors are connected in series one by one between the plurality of output terminals of the microphone group and the control chip to perform current limiting processing on the discharged external static electricity.

[0015] In some embodiments, the secondary discharge subcircuit comprises:

[0016] A plurality of secondary discharge branches, input ends of the plurality of secondary discharge branches are electrically connected to the control chip, output ends of the plurality of secondary discharge branches are grounded, and the plurality of secondary discharge branches are respectively used to discharge the connected external static electricity after current limiting.

[0017] In some embodiments, the secondary discharge branch includes:

[0018] The second electrostatic tube is connected in series between an output end of the buffer sub-circuit and the ground.

[0019] The utility model also provides an air conditioner, comprising:

[0020] Microphone set;

[0021] A circuit board; a control chip and the above-mentioned electrostatic protection circuit are arranged on the circuit board; the electrostatic protection circuit is connected to the control chip and the microphone group respectively, and the electrostatic protection circuit is used to discharge external static electricity connected to the microphone group.

[0022] In some embodiments, the air conditioner further comprises:

[0023] A base, with accommodation holes and accommodation grooves spaced apart;

[0024] The microphone group is arranged in the accommodating hole, and the circuit board is arranged in the accommodating groove.

[0025] In some embodiments, a diaphragm is attached to the inner wall of the receiving hole.

[0026] The base includes a side wall surrounding and forming the receiving hole;

[0027] The air conditioner further comprises an electrostatic film, which is attached to the side wall and is used for attenuating external static electricity connected to the microphone group.

[0028] In some embodiments, the depth of the receiving hole is greater than a preset depth.

[0029] The technical solution of the utility model simultaneously sets a primary discharge subcircuit and a secondary discharge subcircuit, and separates the primary discharge subcircuit and the secondary discharge subcircuit by a buffer subcircuit, so that after the primary discharge subcircuit discharges the connected external static electricity at high power, it can limit the current through the buffer subcircuit to avoid the current of the external static electricity that has not been discharged from impacting the pins of the control chip. At the same time, since the secondary discharge subcircuit further discharges the external static electricity, the voltage of the external static electricity after current limiting can be no greater than the pin voltage of the control chip. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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.

[0031] Figure 1 This is a schematic diagram of the structure of an embodiment of the electrostatic protection circuit of the utility model;

[0032] Figure 2 It is a structural schematic diagram of another embodiment of the electrostatic protection circuit of the utility model;

[0033] Figure 3 This is a schematic structural diagram of another embodiment of the electrostatic protection circuit of the utility model;

[0034] Figure 4 This is a circuit connection diagram of an embodiment of the electrostatic protection circuit of the utility model;

[0035] Figure 5 It is a structural schematic diagram of an embodiment of the air conditioner of the utility model.

[0036] Description of Figure Numbers:

[0037] Label name Label name 110 Primary Bleeder Subcircuit 210 Accommodating hole 111 Primary discharge branch 220 Receiving slot 120 Buffer Subcircuit TVS11~TVS14 The first electrostatic tube 130 Secondary Bleeding Subcircuit TVS21~TVS24 The second electrostatic tube 131 Secondary discharge branch R11~R14 First resistor 200 Base R21~R24 Second resistor

[0038] 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

[0039] 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.

[0040] 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.

[0041] The utility model provides an electrostatic protection circuit which is applied to an air conditioner. The air conditioner comprises a control chip and a microphone group with multiple output terminals.

[0042] Reference Figure 1 In one embodiment, the electrostatic protection circuit includes:

[0043] The primary discharge subcircuit 110 has a plurality of first input terminals, each of which is electrically connected to a plurality of output terminals of the microphone group in a one-to-one correspondence. The output terminal of the primary discharge subcircuit 110 is grounded. The primary discharge subcircuit 110 is used to discharge external static electricity connected to the microphone group.

[0044] A buffer subcircuit 120, connected in series between the multiple output terminals of the microphone group and the control chip, to limit the current of the discharged external static electricity;

[0045] The secondary discharge sub-circuit 130 has multiple second input terminals, which are respectively used to be electrically connected to the control chip and connected one-to-one with multiple output terminals of the buffer sub-circuit 120. The output terminal of the secondary discharge sub-circuit 130 is grounded, and the secondary discharge sub-circuit 130 is used to discharge the external static electricity after current limiting.

[0046] It should be noted that in order to ensure that the air conditioner can receive the user's voice well when voice control is enabled, the microphone group in the air conditioner is usually able to contact the outside world. This makes the microphone group extremely susceptible to external interference, causing external static electricity to enter the control system of the air conditioner. For example, when the air conditioner is installed near curtains, the curtains flutter; customers touch them in a physical store; and when a new machine is disassembled and the film is removed, these situations may all generate static electricity and cause the microphone group to be exposed to external static electricity.

[0047] Therefore, in the prior art, a discharge circuit is usually set on the output side of the microphone group to discharge the electrostatic electrical energy connected to the microphone group. However, in order to achieve rapid discharge of electrical energy, a high-power resistor and an electrostatic tube are often set at the same time in the existing discharge circuit. This means that when the resistor and the electrostatic tube are connected in series to jointly discharge external static electricity, the large current generated by the external static electricity causes the superimposed voltage of the resistor and the electrostatic tube to still be greater than the pin voltage of the control chip, which may still cause damage to the control chip.

[0048] In this embodiment, a buffer subcircuit 120 and a secondary discharge subcircuit 130 are added after the primary discharge subcircuit 110. When the air conditioner is working normally, the microphone group is inevitably connected to external static electricity. At this time, the primary discharge subcircuit 110 will use internal electrostatic tubes, power resistors, cement resistors and other high-power devices to perform primary discharge of the external static electricity to consume the electrical energy of the external static electricity.

[0049] After the initial discharge of external static electricity, due to the voltage-dividing effect of the buffer sub-circuit 120, the voltage generated by the large current in the primary discharge sub-circuit 110 will not be directly connected to the pin of the control chip, but will be divided by the buffer sub-circuit 120. At the same time, the buffer sub-circuit 120 has a current-limiting effect, which can allow the external static electricity after current limiting to be input into the secondary discharge sub-circuit 130, and the secondary discharge sub-circuit 130 will further discharge the electrical energy of the external static electricity, so that the voltage of the external static electricity after current limiting is not greater than the pin voltage of the control chip.

[0050] The technical solution of the utility model simultaneously sets a primary discharge subcircuit 110 and a secondary discharge subcircuit 130, and separates the primary discharge subcircuit 110 and the secondary discharge subcircuit 130 by a buffer subcircuit 120, so that after the primary discharge subcircuit 110 discharges the connected external static electricity at high power, it can limit the current through the buffer subcircuit 120 to avoid the current of the external static electricity that is not discharged from the impact on the pins of the control chip. At the same time, since the secondary discharge subcircuit 130 further discharges the external static electricity, the voltage of the external static electricity after current limiting can be made not greater than the pin voltage of the control chip.

[0051] Reference Figure 1 and Figure 2 In one embodiment, the primary discharge subcircuit 110 includes:

[0052] A plurality of primary discharge branches 111 are respectively connected in series between a plurality of output terminals of the microphone group and the ground. Each of the primary discharge branches 111 is used for discharging external static electricity connected to the output terminal of the corresponding microphone group.

[0053] In this embodiment, since the microphone group includes at least two microphones, the input end of the microphone group also includes at least two. In order to be able to discharge the external static electricity connected to each output end, the primary discharge subcircuit 110 is provided with a plurality of primary discharge branches 111, and each primary discharge branch 111 is used to discharge the external static electricity connected to the output end of the connected microphone group.

[0054] Reference Figure 2 and Figure 4 In one embodiment, the primary discharge branch 111 includes:

[0055] a first electrostatic tube, wherein a first end of the first electrostatic tube is used to connect to an output end of the microphone group;

[0056] A first resistor is connected in series between the second end of the first electrostatic tube and the ground.

[0057] In this embodiment, the first resistors R11~R14 are power resistors for consuming static electricity energy. When static electricity comes from the microphone group, the first static electricity tubes TVS11~TVS14 will be turned on first because the voltage is relatively high at the beginning of the static electricity energy. Then the static electricity energy will return to the ground line through the first resistors R11~R14 for consumption. At this time, most of the static electricity energy will be attenuated, thereby achieving preliminary discharge of external static electricity.

[0058] Reference Figure 1 and Figure 4 In one embodiment, the buffer subcircuit 120 includes:

[0059] A plurality of second resistors R21 - R24 are connected in series one by one between a plurality of output ends of the microphone group and the control chip to perform current limiting processing on the discharged external static electricity.

[0060] In this embodiment, after the primary discharge sub-circuit 110 discharges the external static electricity for the first time, due to the voltage dividing effect of the second resistors R21~R24, the voltage generated by the large current in the primary discharge sub-circuit 110 will not be directly connected to the pin of the control chip, but will be divided by the second resistors R21~R24. At the same time, since the second resistors R21~R24 are current limiting resistors, they can play a certain buffering role when the static electricity energy comes, and can limit the current of the discharged external static electricity. Then, the secondary discharge sub-circuit 130 further discharges the electrical energy of the external static electricity, so that the voltage of the external static electricity after current limiting is not greater than the pin voltage of the control chip.

[0061] Reference Figures 1 to 4 In one embodiment, the secondary discharge subcircuit 130 includes:

[0062] A plurality of secondary discharge branches 131, input ends of the plurality of secondary discharge branches 131 are electrically connected to the control chip, output ends of the plurality of secondary discharge branches 131 are grounded, and the plurality of secondary discharge branches 131 are respectively used to discharge the external static electricity after current limiting.

[0063] In this embodiment, the secondary discharge branch 131 includes:

[0064] The second electrostatic tube is connected in series between an output terminal of the buffer sub-circuit 120 and the ground.

[0065] Specifically, after the external static electricity is consumed by the first static electricity tubes TVS11~TVS14 and the first resistors R11~R14, most of the static electricity energy will be attenuated. However, the first static electricity tubes TVS11~TVS14 have a breakdown voltage. When combined with the resistance voltage of the first resistors R11~R14 when a large current flows through them, the voltage on the input side of the buffer sub-circuit 120 will be too high. This voltage can still damage the pins of the control chip. Therefore, at one end where the buffer sub-circuit 120 is connected to the pins of the control chip, the second static electricity tubes TVS21~TVS24 are added for secondary energy discharge, which can effectively protect the pins of the control chip.

[0066] The utility model also provides an air conditioner, comprising:

[0067] Microphone set;

[0068] A circuit board; a control chip and the above-mentioned electrostatic protection circuit are arranged on the circuit board; the electrostatic protection circuit is connected to the control chip and the microphone group respectively, and the electrostatic protection circuit is used to discharge external static electricity connected to the microphone group.

[0069] In this embodiment, the control chip may be a voice control chip, which is electrically connected to the main board of the air conditioner to process the voice signal received by the microphone group and convert it into a digital signal output that can be recognized by the main board, so that the main board can control the operation of the corresponding functional load in the air conditioner according to the received digital signal.

[0070] Reference Figure 5 In one embodiment, the air conditioner further comprises:

[0071] The base 200 is provided with a receiving hole 210 and a receiving groove 220 at intervals;

[0072] The microphone assembly is disposed in the receiving hole 210 , and the circuit board is disposed in the receiving groove 220 .

[0073] In this embodiment, the receiving groove 220 may be a rectangular groove, and the specific shape may be adaptively set according to the shape of the circuit board; the depth of the receiving hole 210 is greater than a preset depth.

[0074] The base 200 is arranged on the outer shell of the air conditioner, and the microphone group is fixed by setting the receiving hole 210, and can be directly contacted with the outside through the hole of the receiving hole 210 to ensure the recognition rate of the voice. In addition, by setting the receiving hole 210 and the receiving groove 220 at intervals, and deepening the depth of the receiving hole 210 so that the distance between the microphone and the panel is greater than the preset depth, the distance between the microphone group and the panel is increased, and the energy of static electricity is greatly attenuated, thereby structurally avoiding interference to the system. It is understandable that the preset depth is set by the R&D personnel according to the actual needs of the air conditioner and the results of multiple experiments, and can be a deeper depth such as 5mm, 6mm, etc.

[0075] Reference Figure 5 In one embodiment, the base 200 includes a side wall surrounding and forming the receiving hole 210;

[0076] The air conditioner further comprises an electrostatic film, which is attached to the side wall and is used for attenuating external static electricity connected to the microphone group.

[0077] In this embodiment, the electrostatic film is a non-adhesive film, mainly made of PE and PVC materials, which adheres to the objects through electrostatic adsorption to protect them. Sticking the electrostatic film on the side wall of the receiving hole 210 can effectively attenuate the energy of static electricity.

[0078] The utility model also proposes an air conditioner, which includes A and an electrostatic protection circuit. The specific structure of the electrostatic protection circuit refers to the above-mentioned embodiment. Since the air conditioner adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0079] 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 electrostatic protection circuit, applied to an air conditioner, the air conditioner comprising a control chip and a microphone group with multiple output terminals, characterized in that: The electrostatic protection circuit comprises: A primary discharge subcircuit has a plurality of first input terminals, each of which is electrically connected to a plurality of output terminals of the microphone group in a one-to-one correspondence, and the output terminal of the primary discharge subcircuit is grounded. The primary discharge subcircuit is used to discharge external static electricity connected to the microphone group; A buffer subcircuit, connected in series between the multiple output terminals of the microphone group and the control chip, to limit the current of the discharged external static electricity; The secondary discharge sub-circuit has multiple second input terminals, which are respectively used to be electrically connected to the control chip and connected one-to-one with multiple output terminals of the buffer sub-circuit. The output terminal of the secondary discharge sub-circuit is grounded, and the secondary discharge sub-circuit is used to discharge the external static electricity after current limiting.

2. The electrostatic protection circuit according to claim 1, characterized in that: The primary discharge subcircuit comprises: A plurality of primary discharge branches are respectively connected in series between a plurality of output terminals of the microphone group and the ground, and each of the primary discharge branches is used for discharging external static electricity connected to the output terminal of the corresponding microphone group.

3. The electrostatic protection circuit according to claim 2, characterized in that: The primary discharge branch comprises: a first electrostatic tube, wherein a first end of the first electrostatic tube is used to connect to an output end of the microphone group; A first resistor is connected in series between the second end of the first electrostatic tube and the ground.

4. The electrostatic protection circuit according to claim 1, characterized in that: The buffer subcircuit comprises: A plurality of second resistors are connected in series one by one between the plurality of output terminals of the microphone group and the control chip to perform current limiting processing on the discharged external static electricity.

5. The electrostatic protection circuit according to claim 1, characterized in that: The secondary discharge subcircuit comprises: A plurality of secondary discharge branches, input ends of the plurality of secondary discharge branches are electrically connected to the control chip, output ends of the plurality of secondary discharge branches are grounded, and the plurality of secondary discharge branches are respectively used to discharge the connected external static electricity after current limiting.

6. The electrostatic protection circuit according to claim 5, characterized in that: The secondary discharge branch comprises: The second electrostatic tube is connected in series between an output end of the buffer sub-circuit and the ground.

7. An air conditioner, characterized in that: include: Microphone set; A circuit board; the circuit board is provided with a control chip and an electrostatic protection circuit as claimed in any one of claims 1 to 6; The electrostatic protection circuit is connected to the control chip and the microphone group respectively, and the electrostatic protection circuit is used to discharge external static electricity connected to the microphone group.

8. The air conditioner according to claim 7, characterized in that: The air conditioner also includes: A base, with accommodation holes and accommodation grooves provided at intervals; The microphone group is arranged in the accommodating hole, and the circuit board is arranged in the accommodating groove.

9. The air conditioner according to claim 8, characterized in that: The depth of the accommodating hole is greater than a preset depth.

10. The air conditioner according to claim 8, characterized in that: The base also includes a side wall surrounding and forming the receiving hole; The air conditioner further comprises an electrostatic film, which is attached to the side wall and is used for attenuating external static electricity connected to the microphone group.

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