Loudspeaker control circuit and medical device

Abstract

The utility model discloses a kind of loudspeaker control circuit and medical equipment, loudspeaker control circuit includes at least two loudspeaker circuits, each loudspeaker circuit is connected with at least another loudspeaker circuit communication, and loudspeaker circuit includes: loudspeaker;Control module, with loudspeaker electrical connection;Fault detection module, at least one end is electrically connected between loudspeaker and control module, including signal output end, signal output end is electrically connected with control module, fault detection module is configured to detect the fault signal of loudspeaker, and send fault signal to control module;Control module is configured to send the fault signal received to the control module of at least another loudspeaker control circuit connected with it communication, so that the control module of at least another loudspeaker control circuit controls corresponding loudspeaker to issue alarm.The utility model embodiment loudspeaker control circuit when any one loudspeaker is damaged, other loudspeaker can replace it and alarm in time.

Description

Technical Field

[0001] This utility model relates to the field of medical alarm device technology, and in particular to a speaker control circuit and medical equipment. Background Technology

[0002] When medical equipment malfunctions, it will issue an alarm signal to alert the user and prevent danger.

[0003] In existing technologies, medical devices typically use only one speaker to provide sound alarms for multiple functions. For example, if any one of the functional components fails, the speaker is driven to sound an alarm for the corresponding faulty component.

[0004] In this situation, if the speaker circuit malfunctions and the medical device cannot issue an alarm in time, it will pose a hidden danger and threaten the patient's safety. Utility Model Content

[0005] This utility model provides a speaker control circuit and a medical device, which can promptly trigger an alarm when any speaker in the medical device is damaged.

[0006] In a first aspect, embodiments of the present invention provide a loudspeaker control circuit, comprising at least two loudspeaker circuits, each loudspeaker circuit being communicatively connected to at least one other loudspeaker circuit. Each loudspeaker circuit includes: a loudspeaker; a control module electrically connected to the loudspeaker; and a fault detection module, at least one end of which is electrically connected between the loudspeaker and the control module. The fault detection module includes a signal output terminal electrically connected to the control module. The fault detection module is configured to detect a fault signal from the loudspeaker and send the fault signal to the control module. The control module is configured to send the received fault signal to the control module of the at least one other loudspeaker control circuit communicatively connected to it, thereby causing the control module of the at least one other loudspeaker control circuit to control the corresponding loudspeaker to issue a fault alarm.

[0007] The speaker control circuit of this utility model connects different speaker circuits through communication, thereby realizing the association between different speaker circuits. When any speaker circuit fails, the other speaker circuits associated with it can still receive the fault signal, so that the speakers of other speaker circuits can replace the faulty speaker circuit to issue an alarm, so as to avoid safety hazards and improve the reliability of medical equipment.

[0008] Optionally, the control module includes a main controller and a first controller. The main controller is electrically connected to the first controller and the signal output terminal, and the first controller is electrically connected to the speaker. The main controller of each speaker control circuit is communicatively connected to the main controller of at least another speaker control circuit. Each main controller can send the received fault signal to at least another main controller, causing the speaker of the other speaker control circuit to emit a fault alarm.

[0009] Optionally, the fault detection module includes a second controller and a fault detection unit. The first pin of the speaker is electrically connected to the first controller, and the second pin of the speaker is electrically connected to the first controller via a first node and a second node. The first input terminal and the second input terminal of the second controller are electrically connected to the first node and the second node, respectively. The signal output terminal is located on the second controller. The second controller receives the fault signal passed through the fault detection unit through the first input terminal and / or the second input terminal, and sends the fault signal to the main controller through the signal output terminal.

[0010] Optionally, the fault detection unit includes a first resistor, a second resistor, a third resistor, and a fourth resistor. The first resistor is connected between the first node and the second node, the second resistor is connected between the second node and the second input terminal, the third resistor is connected between the first node and the first input terminal, and the two ends of the fourth resistor are electrically connected to the first input terminal and the signal output terminal, respectively.

[0011] Optionally, the fault detection unit further includes a first capacitor and a second capacitor, which are connected in parallel. One end of the first capacitor and the second capacitor are grounded, and the other end is electrically connected to the third node. The first power supply, the third node, and the second controller are connected in series in sequence.

[0012] Optionally, the speaker control circuit further includes a first ferrite bead and a second ferrite bead. The first controller includes a first control terminal and a second control terminal. The first control terminal, the first ferrite bead, and the first pin are connected in series in sequence. The second control terminal, the second ferrite bead, and the second pin are connected in series in sequence in sequence. The second control terminal is located on the side of the first control terminal of the first controller that is close to the ground terminal.

[0013] Optionally, the speaker control circuit further includes a switch-restart module. The first controller includes a power supply terminal, and the power supply terminal, the switch-restart module, and the second power supply are connected in series so that the second power supply can supply power to the first controller. The restart signal terminal of the switch-restart module is electrically connected to the main controller. The switch-restart module is configured to receive a fault signal through the restart signal terminal and control the switching of the switch-restart module and the second power supply according to the fault signal, so that the first controller restarts.

[0014] Optionally, the switch restart module includes a transistor, a fifth resistor, a sixth resistor, a seventh resistor, and a triode. The first terminal of the transistor is electrically connected to the first controller, the second terminal is electrically connected to the second power supply, and the third terminal is electrically connected to the collector of the triode. The base of the triode, the fifth resistor, and the restart signal terminal are connected in series. The two ends of the sixth resistor are electrically connected to the base and emitter of the triode, respectively. The two ends of the seventh resistor are electrically connected to the second and third terminals of the transistor, respectively. The triode is configured to receive a fault signal from the restart signal terminal, and the transistor is configured to control the switching between the second power supply and the first controller based on the fault signal.

[0015] Optionally, the speaker control circuit also includes a third capacitor, one end of which is electrically connected to the second power supply and the other end is grounded. The third capacitor is configured to perform initial filtering of the current from the second power supply.

[0016] Optionally, the speaker control circuit also includes a filtering module, which includes a third ferrite bead, a fourth capacitor, and a fifth capacitor. One end of the third ferrite bead is electrically connected to the switch restart module, and the other end is electrically connected to the power supply terminal through a fourth node. One end of the fourth and fifth capacitors is electrically connected to the fourth node, and the other ends are grounded respectively. The third ferrite bead, the fourth capacitor, and the fifth capacitor are configured to filter out noise and interference in the current of the second power supply.

[0017] Secondly, embodiments of the present invention provide a medical device, the medical device comprising: a speaker control circuit of any of the foregoing embodiments of the first aspect of the present invention; and a ventilation device, the speaker control circuit being electrically connected to the ventilation device, the speaker control circuit being configured to issue an alarm in the event of a malfunction of the ventilation device.

[0018] The medical device of this utility model has a speaker control circuit that connects different speaker circuits through communication, so that when any speaker circuit fails, the other speaker circuits associated with it can still receive the fault signal. This allows the speakers of the other speaker circuits to take the place of the faulty speaker circuit to issue an alarm, thereby avoiding safety hazards and improving the reliability of the medical device. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1This is a structural block diagram of the first embodiment of the speaker control circuit of this utility model;

[0021] Figure 2 This is a structural block diagram of a second embodiment of the speaker control circuit of this utility model;

[0022] Figure 3 This is a schematic diagram of the second embodiment of the speaker control circuit of this utility model;

[0023] Figure 4 This is a schematic diagram of the third embodiment of the speaker control circuit of this utility model.

[0024] Explanation of icon numbers:

[0025] 100 - Speaker circuit; P1 - First node; P2 - Second node; P3 - Third node; P4 - Fourth node; FB1 - First ferrite bead; FB2 - Second ferrite bead; U1 - First power supply; U2 - Second power supply; C3 - Third capacitor; R8 - Eighth resistor;

[0026] 110 - Speaker; 111 - First pin; 112 - Second pin;

[0027] 120 - Control module; M1 - Main controller; M2 - First controller; M21 - First control terminal; M22 - Second control terminal; M23 - Power supply terminal;

[0028] 130 - Fault detection module; 131 - Fault detection unit; R1 - First resistor; R2 - Second resistor; R3 - Third resistor; R4 - Fourth resistor; C1 - First capacitor; C2 - Second capacitor;

[0029] M3 - Second controller; M31 - First input terminal; M32 - Second input terminal; M33 - Signal output terminal;

[0030] 140 - Switch / Reset Module; Q1 - Transistor; Q2 - Bipolar Junction Transistor; R5 - Fifth Resistor; R6 - Sixth Resistor; R7 - Seventh Resistor; 141 - Reset Signal Terminal;

[0031] 150 - Filter module; FB3 - Third ferrite bead; C4 - Fourth capacitor; C5 - Fifth capacitor. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0034] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, the user should consider such a combination of technical solutions to be non-existent and not within the scope of protection claimed by this utility model.

[0035] Figure 1 This is a structural block diagram of a first embodiment of the speaker control circuit of this utility model. In the first embodiment of this utility model, the speaker control circuit includes at least two speaker circuits 100, each speaker circuit 100 being communicatively connected to at least one other speaker circuit 100. Each speaker circuit 100 includes a speaker 110, a control module 120, and a fault detection module 130. The control module 120 is electrically connected to the speaker 110, and at least one end of the fault detection module 130 is electrically connected between the speaker 110 and the control module 120.

[0036] like Figure 2 and Figure 3 As shown, in this embodiment, the fault detection module 130 includes a signal output terminal M33, which is electrically connected to the control module 120. The fault detection module 130 is configured to detect the fault signal of the speaker 110 and send the fault signal to the control module 120.

[0037] The control module 120 is configured to send the received fault signal to the control module 120 of at least another speaker control circuit connected to it, so that the control module 120 of the at least other speaker control circuit controls the corresponding speaker 110 to issue a fault alarm.

[0038] The speaker control circuit may include two, three or more speaker circuits 100, such as Figure 2 and Figure 3As shown, considering the hardware cost of medical equipment, in the second embodiment of this utility model, taking two interconnected speaker circuits 100 as an example: the fault detection module 130 is used to detect the fault signal of the speaker 110. The control module 120 of each speaker circuit 100 is electrically connected to the signal output terminal M33 of the fault detection module 130 to receive the fault signal from the signal output terminal M33 and control the speaker 110 to issue a fault alarm. When the speaker 110 fails to emit sound due to a fault, the control module 120 of the faulty speaker circuit 100 can send the fault signal to the control module 120 of the other speaker circuit 100 connected to it, so that the speaker 110 of the other speaker circuit 100 can issue a fault alarm in place of the faulty speaker circuit 100.

[0039] In this embodiment of the invention, the speaker control circuit establishes a connection between different speaker circuits 100 through communication. When any one speaker circuit 100 fails, the other associated speaker circuits 100 can still receive the fault signal, allowing their speakers 110 to issue an alarm in place of the faulty circuit. Since the probability of two speaker circuits 100 failing simultaneously is much lower than the probability of one speaker circuit 100 failing, controlling their respective speakers 110 through two independent speaker circuits 100 and communicating with each other to achieve mutual detection greatly improves the reliability of the medical equipment and avoids potential safety hazards.

[0040] In some embodiments, the control module 120 includes a main controller M1 and a first controller M2. The main controller M1 is electrically connected to the first controller M2 and the signal output terminal M33, and the first controller M2 is electrically connected to the speaker 110.

[0041] The main controller M1 of each speaker control circuit is communicatively connected to the main controller M1 of at least another speaker control circuit. Each main controller M1 is able to send the received fault signal to at least another main controller M1, causing the speaker 110 of the other speaker control circuit to issue a fault alarm.

[0042] In this embodiment, Figure 3 The CPU BUSY, CPU DATA1, and CPU DATA2 shown are the main control terminals of the main controller M1. Control commands generated by the main controller M1 are sent to the first controller M2 through these main control terminals. The first controller M2 controls the speaker 110 to emit corresponding sounds based on the received control commands. For example, the first controller M2 generates a corresponding PWM signal based on the control command, controlling the speaker 110 to emit the corresponding sound.

[0043] The signal output terminal M33 of the fault detection module 130 is electrically connected to the fault detection terminal (i.e., CPU DETECT terminal) of the main controller M1. When the main controller M1 receives a fault signal, it can transmit the received fault signal in real time to the main controller M1 of another speaker control circuit that is connected to it. While the main controller M1 of the faulty speaker control circuit attempts to control the faulty speaker 110 to issue a fault alarm, the other main controller M1 that receives the fault signal also controls its corresponding speaker 110 to issue a fault alarm, ensuring that the user can know the fault of the speaker 110 and promptly remind the user to repair the fault.

[0044] In some embodiments, the fault detection module 130 includes a second controller M3 and a fault detection unit 131. The first pin 111 of the speaker 110 is electrically connected to the first controller M2. The second pin 112 of the speaker 110 is electrically connected to the first controller M2 via the first node P1 and the second node P2. The first input terminal M31 and the second input terminal M32 of the second controller M3 are electrically connected to the first node P1 and the second node P2, respectively. The signal output terminal M33 is disposed on the second controller M3.

[0045] The second controller M3 receives the fault signal from the fault detection unit 131 through the first input terminal M31 and / or the second input terminal M32, and sends the fault signal to the main controller M1 through the signal output terminal M33.

[0046] In this embodiment, two pins of the speaker 110 are electrically connected to the first controller M2, and two input terminals of the second controller M3 are connected between one pin of the speaker 110 and the first controller M2. When the speaker 110 malfunctions (for example, the current between the speaker 110 and the first controller M2 increases sharply, i.e., a short circuit occurs, or decreases sharply, i.e., the speaker 110 is open-circuited), the two input terminals of the second controller M3 detect the rapidly changing current. When the detected current exceeds the safety threshold range, it is determined that the speaker 110 has malfunctioned, and a fault signal is sent to the main controller M1 through the signal output terminal M33.

[0047] The safety threshold range can be freely set according to the specific usage environment of the speaker circuit 100, and this application does not limit it.

[0048] In some embodiments, the fault detection unit 131 includes a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4. The first resistor R1 is connected between the first node P1 and the second node P2. The second resistor R2 is connected between the second node P2 and the second input terminal M32. The third resistor R3 is connected between the first node P1 and the first input terminal M31. The two ends of the fourth resistor R4 are electrically connected to the first input terminal M31 and the signal output terminal M33, respectively.

[0049] In this embodiment, the first resistor R1 is connected as a sampling resistor between the first node P1 and the second node P2. The first input terminal M31 and the second input terminal M32 of the second controller M3 are electrically connected to the first node P1 and the second node P2, respectively. The fault signal of the speaker 110 is collected by detecting the current signal or voltage signal of the first resistor R1.

[0050] Furthermore, the fault detection unit 131 also includes a first capacitor C1 and a second capacitor C2. The first capacitor C1 and the second capacitor C2 are connected in parallel, and one end of the first capacitor C1 and the second capacitor C2 are grounded, while the other end is electrically connected to the third node P3. The first power supply U1, the third node P3, and the second controller M3 are connected in series in sequence.

[0051] In this embodiment, the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the first capacitor C1, and the second capacitor C2 constitute a fault detection unit 131, which works in conjunction with the second controller M3 to detect whether the speaker 110 has malfunctioned. When the speaker 110 malfunctions, the fault signal is sent to the main controller M1 through the signal output terminal M33 so that the main controller M1 can handle the fault in a timely manner.

[0052] The first power supply U1 is used to supply power to the second controller M3, enabling the second controller M3 to detect whether the speaker 110 has malfunctioned in real time and transmit the fault signal to the main controller M1. In this embodiment, the first power supply U1 is a +3V voltage source.

[0053] In some embodiments, the speaker control circuit further includes a first magnetic bead FB1 and a second magnetic bead FB2. The first controller M2 includes a first control terminal M21 and a second control terminal M22. The first control terminal M21, the first magnetic bead FB1 and the first pin 111 are connected in series. The second control terminal M22, the second magnetic bead FB2 and the second pin 112 are connected in series.

[0054] The second control terminal M22 is located on the side of the first control terminal M21 of the first controller M2 that is close to the ground terminal.

[0055] In this embodiment, the first input terminal M31 and the second input terminal M32 of the second controller M3 are electrically connected to the first node P1 and the second node P2, respectively, and the first node P1 and the second node P2 are located between the second pin 112 of the speaker 110 and the second control terminal M22 of the first controller M2.

[0056] The first control terminal M21, the first ferrite bead FB1, and the first pin 111 are connected in series to form the first filter circuit. The second control terminal M22, the second ferrite bead FB2, and the second pin 112 are connected in series to form the second filter circuit. The two filter circuits are used to filter out interference in the PWM signal and ensure the normal operation of the first controller M2.

[0057] Figure 4 This is a schematic diagram of the third embodiment of the speaker control circuit of this utility model. Some parts of the structure of the third embodiment are the same as those of the second embodiment. The differences between the two will be described below, and the similarities will not be described in detail.

[0058] like Figure 4 As shown, in the third embodiment of this utility model, the first input terminal M31 and the second input terminal M32 of the second controller M3 are connected to the first filter circuit, and the first filter circuit is used to detect whether the speaker 110 has malfunctioned. In the second embodiment of this utility model, the first input terminal M31 and the second input terminal M32 of the second controller M3 are connected to the second filter circuit, and the second filter circuit is used to detect whether the speaker 110 has malfunctioned.

[0059] In this embodiment, the current signals in the two filter circuits form a pair of differential signals with equal magnitudes and opposite directions. Therefore, the fault detection module 130 only needs to detect one of the circuits to determine whether the speaker 110 has malfunctioned. Since the second filter circuit is closer to the ground terminal of the first controller M2 and is a low-side detection circuit, it is less susceptible to interference. Connecting the first input terminal M31 and the second input terminal M32 of the second controller M3 to the second filter circuit achieves better detection results. If the first input terminal M31 and the second input terminal M32 of the second controller M3 are connected to the first filter circuit, the first filter circuit will be affected by common-mode voltage interference, impacting the detection accuracy of the second controller M3 and affecting both detection accuracy and efficiency.

[0060] Therefore, in the second embodiment of this utility model, it is a preferred embodiment to connect the first input terminal M31 and the second input terminal M32 of the second controller M3 to the second filter circuit, and to detect whether the speaker 110 has malfunctioned through the second filter circuit.

[0061] In some embodiments, the speaker control circuit further includes a switch-restart module 140. The first controller M2 includes a power supply terminal M23. The power supply terminal M23, the switch-restart module 140, and the second power supply U2 are connected in series, so that the second power supply U2 can supply power to the first controller M2. The restart signal terminal 141 of the switch-restart module 140 is electrically connected to the main controller M1.

[0062] The switch restart module 140 is configured to receive a fault signal through the restart signal terminal 141 and control the switching of the switch restart module 140 and the second power supply U2 according to the fault signal, so that the first controller M2 restarts.

[0063] In this embodiment, after receiving a fault signal, the main controller M1 sends a restart command to the switch restart module 140 through the restart signal terminal 141, so that the switch restart module 140 controls the second power supply U2 to disconnect and reconnect with the first controller M2, so that the first controller M2 restarts and the first controller M2 controls the speaker 110 to emit sound again.

[0064] If the first controller M2 fails to restart the speaker 110, the main controller M1 in the other speaker circuit 100 can also control the corresponding speaker 110 to issue an alarm based on the received fault signal, ensuring that the user can receive the fault alarm.

[0065] Furthermore, the switch restart module 140 includes transistor Q1, fifth resistor R5, sixth resistor R6, seventh resistor R7 and transistor Q2.

[0066] The first terminal of transistor Q1 is electrically connected to the first controller M2, the second terminal is electrically connected to the second power supply U2, and the third terminal is electrically connected to the collector of transistor Q2. The base of transistor Q2, the fifth resistor R5, and the reset signal terminal 141 are connected in series. The two ends of the sixth resistor R6 are electrically connected to the base and emitter of transistor Q2, respectively. The two ends of the seventh resistor R7 are electrically connected to the second terminal and the third terminal of transistor Q1, respectively.

[0067] Transistor Q2 is configured to receive a fault signal from restart signal terminal 141, and transistor Q1 is configured to control the switching between the second power supply U2 and the first controller M2 according to the fault signal.

[0068] In this embodiment, the base of transistor Q2 is electrically connected to the restart signal terminal 141 to receive a restart command and trigger transistor Q1, so that transistor Q1 controls the switching between the second power supply U2 and the first controller M2, thereby realizing the power-off restart of the first controller M2.

[0069] In some embodiments, the speaker control circuit further includes a third capacitor C3, one end of which is electrically connected to the second power supply U2 and the other end is grounded. The third capacitor C3 is configured to perform initial filtering on the current of the second power supply U2.

[0070] In this embodiment, the third capacitor C3 acts as a filter capacitor to filter the second power supply U2, ensuring a stable power supply to the first controller M2. The second power supply U2 in this embodiment is a +5V voltage source.

[0071] In some embodiments, the speaker control circuit further includes a filter module 150, which includes a third ferrite bead FB3, a fourth capacitor C4, and a fifth capacitor C5. One end of the third ferrite bead FB3 is electrically connected to the switch restart module 140, and the other end is electrically connected to the power supply terminal M23 through the fourth node P4. One end of the fourth capacitor C4 and the fifth capacitor C5 are electrically connected to the fourth node P4, and the other ends are respectively grounded.

[0072] Among them, the third ferrite bead FB3, the fourth capacitor C4 and the fifth capacitor C5 are configured to filter out noise and noise in the current of the second power supply U2.

[0073] In this embodiment, the third ferrite bead FB3, the fourth capacitor C4, and the fifth capacitor C5 form a filter module 150, which is used to further filter the second power supply U2, filter out noise and clutter in the second power supply U2, eliminate the interference of noise and clutter on the first controller M2, and thus ensure the sound quality of the speaker 110.

[0074] In some embodiments, the speaker control circuit further includes an eighth resistor R8, one end of which is connected between the first input terminal M31 of the second controller M3 and the third resistor R3, and the other end is grounded. The eighth resistor R8 is used to ensure that the input terminal of the second controller M3 remains at a stable low level when no fault signal is detected, thereby preventing the second controller M3 from being falsely triggered.

[0075] This utility model embodiment also provides a medical device, which includes: a speaker control circuit and a ventilation device according to any of the foregoing embodiments of this utility model, wherein the speaker control circuit is electrically connected to the ventilation device, and the speaker control circuit is configured to issue an alarm in the event of a malfunction of the ventilation device.

[0076] The ventilation device can be a ventilator, a high-flow humidified oxygen therapy device, an oxygen concentrator, or any other device that provides ventilation for the patient. It is easy to imagine that the speaker control circuit in this utility model can also be used in other medical devices such as nebulizers and pulse oximeters.

[0077] The medical device of this utility model has a speaker control circuit that connects different speaker circuits through communication, so that when any speaker circuit fails, the other speaker circuits associated with it can still receive the fault signal. This allows the speakers of the other speaker circuits to take the place of the faulty speaker circuit to issue an alarm, thereby avoiding safety hazards and improving the reliability of the medical device.

[0078] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A loudspeaker control circuit, characterized in that, The speaker circuit includes at least two speaker circuits, each of which is communicatively connected to at least one other speaker circuit. The speaker circuit includes: speaker; The control module is electrically connected to the speaker; A fault detection module, at least one end of which is electrically connected between the speaker and the control module, the fault detection module includes a signal output terminal electrically connected to the control module, and the fault detection module is configured to detect a fault signal of the speaker and send the fault signal to the control module; The control module is configured to send the received fault signal to the control module of at least one other speaker control circuit that is communicatively connected thereto, such that the control module of the at least one other speaker control circuit controls the corresponding speaker to issue a fault alarm.

2. The speaker control circuit as described in claim 1, characterized in that, The control module includes a main controller and a first controller. The main controller is electrically connected to the first controller and the signal output terminal, and the first controller is electrically connected to the speaker. Each of the speaker control circuits has a main controller that is communicatively connected to at least one other speaker control circuit's main controller. Each main controller is able to send the received fault signal to at least one other main controller, causing the speaker of the other speaker control circuit to issue a fault alarm.

3. The speaker control circuit as described in claim 2, characterized in that, The fault detection module includes a second controller and a fault detection unit. The first pin of the speaker is electrically connected to the first controller. The second pin of the speaker is electrically connected to the first controller via a first node and a second node. The first input terminal and the second input terminal of the second controller are electrically connected to the first node and the second node, respectively. The signal output terminal is located on the second controller. The second controller receives the fault signal from the fault detection unit through the first input terminal and / or the second input terminal, and sends the fault signal to the main controller through the signal output terminal.

4. The speaker control circuit as described in claim 3, characterized in that, The fault detection unit includes a first resistor, a second resistor, a third resistor, and a fourth resistor. The first resistor is connected between the first node and the second node, the second resistor is connected between the second node and the second input terminal, the third resistor is connected between the first node and the first input terminal, and the two ends of the fourth resistor are electrically connected to the first input terminal and the signal output terminal, respectively.

5. The speaker control circuit as described in claim 4, characterized in that, The fault detection unit also includes a first capacitor and a second capacitor. The first capacitor and the second capacitor are connected in parallel, and one end of the first capacitor and the second capacitor are grounded, while the other end is electrically connected to the third node. The first power supply, the third node, and the second controller are connected in series in sequence.

6. The speaker control circuit as described in claim 3, characterized in that, The speaker control circuit further includes a first ferrite bead and a second ferrite bead. The first controller includes a first control terminal and a second control terminal. The first control terminal, the first ferrite bead, and the first pin are connected in series in sequence. The second control terminal, the second ferrite bead, and the second pin are connected in series in sequence in sequence. The second control terminal is located on the side of the first control terminal of the first controller that is close to the ground terminal.

7. The speaker control circuit as described in claim 2, characterized in that, The speaker control circuit further includes a switch-restart module. The first controller includes a power supply terminal. The power supply terminal, the switch-restart module, and the second power supply are connected in series, so that the second power supply can supply power to the first controller. The restart signal terminal of the switch-restart module is electrically connected to the main controller. The switch restart module is configured to receive the fault signal through the restart signal terminal, and control the switching of the switch restart module and the second power supply according to the fault signal, so that the first controller restarts.

8. The speaker control circuit as described in claim 7, characterized in that, The switch restart module includes a transistor, a fifth resistor, a sixth resistor, a seventh resistor, and a triode. The first terminal of the transistor is electrically connected to the first controller, the second terminal is electrically connected to the second power supply, and the third terminal is electrically connected to the collector of the triode. The base of the triode, the fifth resistor, and the restart signal terminal are connected in series. The two ends of the sixth resistor are electrically connected to the base and emitter of the triode, respectively. The two ends of the seventh resistor are electrically connected to the second and third terminals of the transistor, respectively. The transistor is configured to receive the fault signal at the restart signal terminal, and the transistor is configured to control the switching between the second power supply and the first controller according to the fault signal.

9. The speaker control circuit as described in claim 7, characterized in that, The speaker control circuit also includes a third capacitor, one end of which is electrically connected to the second power supply and the other end is grounded. The third capacitor is configured to perform initial filtering on the current of the second power supply.

10. The speaker control circuit as described in claim 7, characterized in that, The speaker control circuit also includes a filtering module, which includes a third ferrite bead, a fourth capacitor, and a fifth capacitor. One end of the third ferrite bead is electrically connected to the switch restart module, and the other end is electrically connected to the power supply terminal through a fourth node. One end of the fourth capacitor and the fifth capacitor are electrically connected to the fourth node, and the other ends are grounded respectively. The third ferrite bead, the fourth capacitor, and the fifth capacitor are configured to filter out noise and interference in the current of the second power supply.

11. A medical device, characterized in that, The medical device includes: The speaker control circuit as described in any one of claims 1 to 10; and A ventilation device, wherein the speaker control circuit is electrically connected to the ventilation device and is configured to issue an alarm in the event of a malfunction of the ventilation device.

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