CN114604173B

CN114604173B - Detection system, T-BOX and vehicle

Info

Publication number: CN114604173B
Application number: CN202011461978.XA
Authority: CN
Inventors: 卢慧奇
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-12-09
Filing date: 2020-12-09
Publication date: 2024-05-17
Anticipated expiration: 2040-12-09
Also published as: CN114604173A; WO2022121810A1

Abstract

The application provides a detection system, a T-BOX and a vehicle, and relates to the technical field of detection circuits, wherein the detection circuit is used for collecting first current transmitted between an audio positive differential output end and collecting second current transmitted between a negative electrode port and an audio negative differential output end; the detection circuit is also used for providing first information to the processor according to the first current and the second current, and the first information is used for determining whether the loudspeaker circuit has a first fault or not by the processor. Because the direct current signal and the alternating current signal output by the audio positive and negative differential output end of the audio power amplifier do not interfere with current collection, the detection system can realize fault detection on the loudspeaker when the audio module works.

Description

Detection system, T-BOX and vehicle

Technical Field

The application relates to the technical field of detection circuits, in particular to a detection system, a T-BOX and a vehicle.

Background

The audio function is achieved by the vehicle through a horn circuit, which generally includes a processor, an audio module, and a horn connected in sequence. The processor generates an audio signal and provides the audio signal to the loudspeaker through the audio module, and the loudspeaker converts the audio signal into a sound signal, so that sound production can be realized.

However, the horn in the horn circuit may fail during the production of the car, during the transportation and assembly, and after a certain period of use by the user. Among these, there may be various situations in which a fault occurs, such as: horn short to ground, horn short to power, horn open, horn-to-wire short, etc.

The existing detection method is generally to connect a resistor in series with the positive electrode port of the loudspeaker and pull up the resistor to a test power supply, and connect a resistor in series with the negative electrode port of the loudspeaker and pull down the resistor to a ground terminal, so that the loudspeaker is used as a resistor load, and whether the loudspeaker is in fault is detected by utilizing a resistor voltage division principle, but the detection is interfered by a direct current signal and an alternating current signal output by an audio module during working, so that the diagnosis cannot be carried out, and therefore, the existing detection method is only applicable to the situation that the audio module does not work.

Therefore, a detection system capable of detecting the speaker when the audio module is in operation is needed.

Disclosure of Invention

The application provides a detection system, a T-BOX and a vehicle, which realize the purpose of detecting faults of a loudspeaker when an audio module works and can detect whether the loudspeaker has faults such as short circuit of the loudspeaker to ground, short circuit of the loudspeaker to a power supply, short circuit among the loudspeakers, open circuit of the loudspeaker and the like.

In order to achieve the above purpose, the application adopts the following technical scheme:

In a first aspect, a detection system is provided, the detection system being coupled to a horn, the detection system comprising: the device comprises a processor, an audio module and a detection circuit, wherein the processor and the audio module are connected, and the detection circuit is connected with the processor and the audio module; the audio module comprises an audio power amplifier with an audio positive differential output end and an audio negative differential output end, the loudspeaker is provided with a positive electrode port and a negative electrode port, the audio positive differential output end is connected with the positive electrode port, and the audio negative differential output end is connected with the negative electrode port;

The detection circuit is used for collecting a first current transmitted between the audio positive differential output end and the positive electrode port and collecting a second current transmitted between the negative electrode port and the audio negative differential output end;

The detection circuit is also used for providing first information to the processor according to the first current and the second current, and the first information is used for determining whether the loudspeaker has a first fault or not by the processor.

The detection system provided in the first aspect collects a first current transmitted between an audio positive differential output end of the audio power amplifier and a positive electrode port of the loudspeaker and a second current transmitted between an audio negative differential output end and a negative electrode port of the loudspeaker through a detection circuit in the detection system, and then provides first information to the processor according to the first current and the second current, so that the processor can judge whether the loudspeaker has a first fault or not. In the detection system, when the audio module works, the direct current signal and the alternating current signal output by the audio power amplifier do not interfere with current collection, so that the detection system can realize fault detection on the loudspeaker when the audio module works.

In a possible implementation manner of the first aspect, the detection system includes: the first current acquisition circuit is connected in series between the audio positive differential output end and the positive electrode port, and the second current acquisition circuit is connected in series between the audio negative differential output end and the negative electrode port; the first current acquisition circuit is used for acquiring a first current transmitted between the audio positive differential output end and the positive electrode port and providing the first current for the processor, and the second current acquisition circuit is used for acquiring a second current transmitted between the negative electrode port and the audio negative differential output end and providing the second current for the processor.

In a possible implementation manner of the first aspect, the detection system further includes: the current comparison circuit is provided with three connecting ports, and the three connecting ports of the current comparison circuit are respectively connected with the first current acquisition circuit, the second current acquisition circuit and the processor; the current comparison circuit is used for determining a current difference value between the first current and the second current, and correspondingly, the first information comprises the current difference value. In the implementation manner, the current comparison circuit can be used for calculating the current difference between the first current and the second current, so that the processor is only used for carrying out fault judgment according to the current difference obtained through calculation, the calculated amount of the processor is reduced, and the processing efficiency is improved.

In a possible implementation manner of the first aspect, the detection system further includes: the voltage acquisition circuit is connected with the positive electrode port and the negative electrode port of the loudspeaker; the voltage acquisition circuit is used for acquiring a voltage difference value between the positive electrode port and the negative electrode port, and correspondingly, the first information comprises a first current, a second current and a voltage difference value. In the implementation mode, the processor combines the voltage difference value with the first current and the second current according to the voltage difference value acquired by the voltage acquisition circuit to calculate the resistance value corresponding to the loudspeaker, so that whether the loudspeaker fails or not can be accurately judged according to the resistance value of the loudspeaker, and the judgment accuracy is improved.

In a possible implementation manner of the first aspect, the processor is further configured to generate a sub-audio signal and provide the sub-audio signal to the loudspeaker through the audio module, where the frequency of the sub-audio signal is different from the frequency of the audio signal. In the implementation mode, when the loudspeaker plays without sound, whether the loudspeaker fails or not can be judged by detecting the first current, the second current and the voltage difference value acquired during the transmission of the sub-audio signal, so that the loudspeaker circuit can be detected when the audio module outputs no audio signal.

In a possible implementation manner of the first aspect, the detection system further includes: the bias circuit is respectively connected with the audio positive differential output end and the audio negative differential output end; when the audio module does not work, the bias circuit is used for applying bias voltage to the circuit loop where the first current acquisition circuit, the loudspeaker and the second current acquisition circuit are located, and the processor is used for determining whether the loudspeaker has a first fault according to the first current acquired by the first current acquisition circuit, the second current acquired by the second current acquisition circuit and the voltage difference acquired by the voltage acquisition circuit when the bias voltage is applied. In this implementation, when the audio module is not operating, the bias circuit may apply a bias voltage to determine whether the horn has a first failure.

In a possible implementation manner of the first aspect, the first current acquisition circuit includes: a first resistor and a first differential operational amplifier; the first resistor is connected in series between the audio positive differential output end and the positive electrode port, and two input ends of the first differential operational amplifier are respectively connected with two ends of the first resistor; the first differential operational amplifier is used for determining a first voltage difference value between two ends of the first resistor and providing the first voltage difference value to the processor, and the processor is used for determining a first current according to the first voltage difference value and the first resistor.

In a possible implementation manner of the first aspect, the second current acquisition circuit includes: the second resistor and the second differential operational amplifier are equal to the first resistor; the second resistor is connected in series between the audio negative differential output end and the negative electrode port, and two input ends of the second differential operational amplifier are respectively connected with two ends of the second resistor; the second differential operational amplifier is used for determining a second voltage difference value between two ends of the second resistor and providing the second voltage difference value to the processor, and the processor is used for determining a second current according to the second voltage difference value and the second resistor.

In a possible implementation manner of the first aspect, the current comparison circuit includes: a third differential operational amplifier; two input ends of the third differential operational amplifier are respectively connected with the output end of the first differential operational amplifier and the output end of the second differential operational amplifier; the third differential operational amplifier is used for determining a third voltage difference between the first voltage difference and the second voltage difference and providing the third voltage difference to the processor, and the processor is used for determining a current difference according to the third voltage difference, the first resistor or the second resistor.

In a possible implementation manner of the first aspect, the voltage acquisition circuit includes: the two input ends of the fourth differential operational amplifier are respectively connected with the positive electrode port and the negative electrode port of the loudspeaker; the fourth differential operational amplifier is used for determining a fourth voltage difference between the positive electrode port and the negative electrode port of the loudspeaker and providing the fourth voltage difference to the processor.

In a possible implementation manner of the first aspect, the bias circuit includes: the bias voltage end, the first bias resistor, the second bias resistor and the grounding end; the first end of the first bias resistor is connected with the bias voltage end, the second end of the first bias resistor is connected with the audio positive differential output end, the first end of the second bias resistor is connected with the audio negative differential output end, and the second end of the second bias resistor is connected with the grounding end.

In one possible implementation of the first aspect, the first fault includes a horn short to power, a horn short to ground, a horn open, or a horn-to-wire short.

In a second aspect, an electronic device is provided comprising a detection system and a horn connected, wherein the detection system is as provided in the first aspect or any possible implementation of the first aspect.

In a third aspect, there is provided a T-BOX comprising a detection system as provided in the first aspect or any possible implementation of the first aspect.

In a possible implementation manner of the third aspect, the T-BOX further includes a horn connected to the detection system.

In a fourth aspect, there is provided a vehicle comprising a T-BOX as provided in any possible implementation of the third aspect or of the third aspect.

In a fifth aspect, there is provided a vehicle comprising a T-BOX and a detection system connected, wherein the detection system is as provided in the first aspect or any possible implementation of the first aspect.

In a possible implementation manner of the fifth aspect, the vehicle further includes a horn connected to the detection system.

According to the detection system, the T-BOX and the vehicle, the first current transmitted between the audio positive differential output end of the audio power amplifier and the positive electrode port of the loudspeaker is collected through the detection circuit in the detection system, the second current transmitted between the audio negative differential output end and the negative electrode port of the loudspeaker is collected through the detection circuit, then the first current and the second current are compared through the processor to judge whether the loudspeaker circuit has faults of short circuit of the loudspeaker to the ground and short circuit of the loudspeaker to the power supply, and then the voltage difference values of the two ends of the loudspeaker are combined to detect whether the loudspeaker circuit has faults of open circuit of the loudspeaker and short circuit between the loudspeaker. Because the direct current signal and the alternating current signal output by the audio power amplifier do not interfere with the collection of current and voltage when the audio module works, the circuit can realize the purpose of fault detection on the loudspeaker circuit when the audio module works.

In addition, the subaudio signal and the bias circuit are added to detect whether the loudspeaker fails when the loudspeaker is in no-sound playing and the audio module does not work, so that the detection comprehensiveness is increased.

Drawings

Fig. 1 is a schematic structural diagram of a terminal device according to an embodiment of the present application;

FIG. 2 is a schematic diagram of a T-BOX according to an embodiment of the present application;

FIG. 3 is a schematic diagram illustrating the connection between a conventional detection system and a speaker;

FIG. 4 is a schematic diagram illustrating the connection between another conventional detection system and a speaker;

FIG. 5 is a schematic diagram illustrating the connection of another conventional detection system to a horn;

FIG. 6 is a schematic diagram illustrating connection between a detection system and a speaker according to an embodiment of the present application;

FIG. 7 is a schematic diagram illustrating connection between a detection system and a speaker according to another embodiment of the present application;

FIG. 8 is a schematic diagram illustrating connection between a detection system and a speaker according to an embodiment of the present application;

FIG. 9 is a schematic diagram illustrating connection between a detection system and a speaker according to an embodiment of the present application;

FIG. 10 is a schematic diagram illustrating connection between a detection system and a speaker according to an embodiment of the present application;

FIG. 11 is a schematic diagram illustrating connection between a detection system and a speaker according to an embodiment of the present application;

Fig. 12 is a schematic structural diagram of a first current collecting circuit according to an embodiment of the present application;

FIG. 13 is a schematic diagram of an equivalent structure of the horn of FIG. 11 with a horn short to ground and a horn short to power failure;

fig. 14 is a schematic diagram illustrating connection between a detection system and a speaker according to another embodiment of the present application.

Reference numerals:

1-a terminal device; 2-a detection system; a 20-detection circuit; 100-T-BOX; 110-a processor; 120-an audio module; 121-an audio decoder; 122-an audio power amplifier; 200-horn; 210-a first current acquisition circuit; 211-a first operational amplifier circuit; 220-a second current acquisition circuit; 230-a current comparison circuit; 240-bias circuit; SPKP-an audio positive differential output; SKPN-an audio negative differential output; VCC-bias voltage terminal; GND-ground; RL-horn resistance; r11-a first resistor; r12-a second resistor; i_ SPKP-a first current; I_SPKN-second current; OP 1-a first differential operational amplifier; OP 2-a second differential operational amplifier; OP 3-a third differential operational amplifier; OP 4-fourth differential operational amplifier; RS 1-first equivalent resistance; RS 2-second equivalent resistance; RT 1-a first bias resistor; RT 2-a second bias resistor; SW 1-a first switch; SW 2-a second switch; BAT-power supply.

Detailed Description

The technical scheme of the application will be described below with reference to the accompanying drawings.

In the description of the embodiments of the present application, unless otherwise indicated, "/" means or, for example, a/B may represent a or B; "and/or" herein is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, in the description of the embodiments of the present application, "plurality" means two or more than two.

The terms "first" and "second" are used below for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present embodiment, unless otherwise specified, the meaning of "plurality" is two or more.

Furthermore, in the present application, directional terms "left", "right", etc. may be defined as including, but not limited to, a direction in which components in the drawings are schematically disposed, and it should be understood that these directional terms may be relative concepts, which are used for the description and clarity of relativity, and which may be correspondingly changed in accordance with the change in the direction in which the components in the drawings are disposed.

In the present application, unless explicitly specified and limited otherwise, the term "connected" is to be construed broadly, and for example, "connected" may be either fixedly connected, detachably connected, or integrally formed; can be directly connected or indirectly connected through an intermediate medium. Furthermore, the term "electrically connected" may be a way of achieving an electrical connection for signal transmission. The "electrical connection" may be direct electrical connection or may be indirect electrical connection via an intermediary.

The technical scheme of the embodiment of the application can be applied to various terminal equipment. For example, the terminal device in the embodiment of the present application may be a mobile phone, a tablet computer, a wearable device, a vehicle-mounted device, an Augmented Reality (AR)/Virtual Reality (VR) device, a notebook computer, an ultra-mobile personal computer (UMPC), a netbook, a Personal Digital Assistant (PDA), or the like, and the embodiment of the present application does not limit the specific type of the terminal device.

Taking a terminal device as an example of a vehicle-mounted device, fig. 1 shows a schematic structural diagram of the terminal device according to an embodiment of the present application. As shown in fig. 1, a terminal device 1 is provided with a detection system 2 and a plurality of horns 200 connected with the detection system 2, the detection system 2 includes a processor 110 and an audio module 120 connected with each other, and a detection circuit 20 electrically connected with both the processor 110 and the audio module 120, and the detection system 2 is used for detecting the horns 200.

In this terminal 1, the audio module 120 is connected to the speaker 200. Thus, the processor 110 may generate an audio signal and provide the audio signal to the speaker 200 through the audio module 120, and the speaker 200 converts the audio signal into a sound signal, so that an audio function may be implemented, and thus, a user may listen to music or broadcasting, etc., using the terminal device 1.

In the production of a vehicle, a manufacturer may typically place the processor 110, audio module 120, and detection circuit 20 in the detection system 2 at a center console location in the vehicle and mount the horn 200 connected to the audio module 120 to the vehicle door. As shown in fig. 1, four speakers 200 are disposed on the vehicle and are respectively mounted on left and right front doors and left and right rear doors of the vehicle, so that in the use process, the processor 110 generates audio signals and provides the audio signals to the four speakers 200 through the audio module 120, and therefore, the four speakers 200 located at different positions can not only realize audio functions in the vehicle, but also form good sound effects, and can improve the user experience.

Of course, the number of speakers and the arrangement positions on different vehicle models may be different, and the number and the arrangement positions may be changed as needed, which is not limited in any way by the present application.

The structure of the detection system 2 in fig. 1 will be described below.

It should be appreciated that the detection system 2 may be disposed in a vehicle-mounted communication BOX (TELEMATICS BOX, T-BOX) of the vehicle, while the horn 200 connected to the detection system 2 is disposed outside the T-BOX, or the detection system 2 and the horn 200 connected thereto may both be disposed in the T-BOX, or the detection system 2 may be disposed outside the T-BOX, only connected to the T-BOX.

Taking the example that the detection system 2 and the horn 200 connected to the detection system 2 are both disposed in the T-BOX, fig. 2 shows a schematic structural diagram of the T-BOX according to an embodiment of the present application. Only one horn 200 is shown in fig. 2 as an example.

Wherein, as shown in fig. 2, the T-BOX comprises a detection system 2 and a loudspeaker 200 which are connected, the detection system 2 comprises a processor 110 and an audio module 120, and a detection circuit 20 which is connected with the processor 11 and the audio module 120, and the audio module 120 can comprise an audio decoder 121 and an audio power amplifier 122.

T-BOX is used to provide solutions for wireless communications including second generation (2th generation,2G) communications technology, third generation (3th generation,3G) communications technology, fourth generation (4th generation,4G) communications technology, fifth generation (5th generation,5G) communications technology, wireless local area networks (wireless local area networks, WLAN) (e.g., wireless fidelity (WIRELESS FIDELITY, wi-Fi) networks), bluetooth (BT), global navigation satellite systems (global navigation SATELLITE SYSTEM, GNSS), frequency modulation (frequency modulation, FM), near field communication (NEAR FIELD communication, NFC), infrared (IR), etc., for use on vehicles. The T-BOX may include at least one filter, switch, power amplifier, low noise amplifier (low noise amplifier, LNA), etc. The T-BOX may receive electromagnetic waves from an antenna, and filter, amplify, etc., the received electromagnetic waves. The T-BOX can amplify the modulated signal, and convert the signal into electromagnetic waves to radiate. The T-BOX may be one or more devices integrating at least one communication processing module.

The processor 110 may include one or more processing units, such as: the processor 110 may include an application processor (application processor, AP), a modem processor, a graphics processor (graphics processing unit, GPU), an image signal processor (IMAGE SIGNAL processor, ISP), a controller, a video codec, a digital signal processor (DIGITAL SIGNAL processor, DSP), a baseband processor, and/or a neural-Network Processor (NPU), etc. Wherein the different processing units may be separate devices or may be integrated in one or more processors.

The controller can generate operation control signals according to the instruction operation codes and the time sequence signals to finish the control of instruction fetching and instruction execution.

A memory may also be provided in the processor 110 for storing instructions and data. In some embodiments, the memory in the processor 110 is a cache memory. The memory may hold instructions or data that the processor 110 has just used or recycled. If the processor 110 needs to reuse the instruction or data, it may be called directly from memory. Repeated accesses are avoided and the latency of the processor 110 is reduced, thereby improving the efficiency of the system.

In some embodiments, the processor 110 may include one or more interfaces. The interface may include an integrated circuit built-in audio (inter-INTEGRATED CIRCUIT SOUND, I2S) interface, or the like.

The I2S interface may be used for audio communication. In some embodiments, the processor 110 may contain multiple sets of I2S buses. The processor 110 may be coupled to the audio module 120 via an I2S bus to enable communication between the processor 110 and the audio module 120.

It should be understood that the connection relationship between the modules illustrated in the embodiment of the present application is only schematically illustrated, and does not limit the structure of the T-BOX. In other embodiments of the present application, the T-BOX may also use different interfacing modes, or a combination of interfacing modes, as in the above embodiments.

The in-vehicle apparatus realizes an audio function through the audio module 120, the speaker 200, the application processor, and the like.

The audio module 120 is used to convert digital audio information into an analog audio signal output, and may also be used to convert an analog audio input into a digital audio signal. The audio module 120 may also be used to encode and decode audio signals and/or power amplify audio signals. In some embodiments, the audio module 120 may be disposed in the processor 110, or some functional modules of the audio module 120 may be disposed in the processor.

The loudspeaker 200, also called a loudspeaker, has a positive port and a negative port for converting an audio signal into a sound signal.

As shown in connection with fig. 2, the audio power amplifier 122 in the audio module 120 has an audio positive differential output and an audio differential output. Wherein SPKP is used to represent the audio positive differential output and SPKN is used to represent the audio negative differential output, as shown in fig. 2. The audio positive differential output SPKP of the audio power amplifier 122 is electrically connected to the positive port of the horn 200, and the audio negative differential output SPKN of the audio power amplifier 122 is electrically connected to the negative port of the horn 200. The audio decoder 121 in the audio module 120 decodes the audio signal output by the processor 110, and provides the decoded audio signal to the audio power amplifier 122 for amplification, and then the audio power amplifier 122 provides the amplified audio signal to the positive and negative ports of the loudspeaker 200 through the audio positive differential output port SPKP and the audio differential output port SPKN, so that the loudspeaker 200 converts the audio signal into a sound signal for sounding after receiving.

It should be understood that the structure illustrated in the embodiments of the present application does not constitute a specific limitation on the T-BOX. In other embodiments of the application, the T-BOX may include more or less components than illustrated, or certain components may be combined, or certain components may be split, or different arrangements of components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

Based on the loudspeaker in the loudspeaker circuit formed by the processor, the audio module and the loudspeaker which are sequentially connected or the loudspeaker which is independently used, the loudspeaker is likely to be in fault in the production process, in the transportation assembly and after a certain time of use by a user. Among these, there may be various situations where a fault occurs, such as a horn short to ground, a horn short to power, a short between horn lines, or a horn open, etc. At this time, the horn needs to be detected to judge what faults occur, so that the follow-up targeted maintenance of the faults is facilitated.

It should be understood that shorting the horn to ground refers to shorting the positive port of the horn to ground or shorting the negative port of the horn to ground. The horn shorting to the power source refers to either the positive port of the horn shorting to the power source or the negative port of the horn shorting to the power source. The short circuit between the horn wires refers to the short circuit caused by direct conduction of the positive electrode port and the negative electrode port of the horn, and the open circuit of the horn refers to disconnection between the positive electrode port and the negative electrode port inside the horn.

In order to detect a failure of a horn, a variety of configurations of the detection circuit 20 have been proposed in the prior art, and three types of detection circuits 20 are described below as examples.

Fig. 3 shows a schematic diagram of the connection of an existing detection system 2 to a loudspeaker 200. As shown in fig. 3, the detection circuit 20 in the detection system 2 is disposed between the audio power amplifier 122 and the horn 200. The detection circuit 20 includes a resistor R1 and a switch SW, wherein a first end of the resistor R1 is connected to the bias voltage terminal VCC, a second end is connected to the positive terminal of the horn 200, a first end of the switch SW is connected to the negative terminal of the horn 200, and a second end is connected to the ground terminal GND.

When the switch SW is closed, the bias voltage is applied to the bias voltage terminal VCC, so that the horn 200 can be regarded as a load impedance RL, and a conductive loop can be formed between the bias voltage terminal VCC and the ground terminal GND through the resistor R1 and the horn resistor RL.

Based on the shown conduction loop, a detection line can be externally connected to the positive electrode port of the loudspeaker 200 to detect the voltage of the loudspeaker 200 when the loudspeaker 200 acts as a load impedance RL, and then according to the voltage of the loudspeaker 200, whether the loudspeaker 200 has a fault can be detected.

For example, when a voltage of 1V is applied to the bias voltage terminal VCC, the voltage value obtained by the detection line connected to the positive electrode port of the horn 200 may be calculated according to formula (1).

In equation (1), VDET0 represents a voltage value obtained by a detection line connected to the positive electrode port of the horn 200.

According to the formula (1), if the horn 200 is normal, the voltage value VDET should be at an intermediate level between 0V and 1V; if a short circuit occurs between wires at two ends of the horn 200, the horn resistance RL1 will be reduced, and the voltage VDET will be close to 0V; if the horn 200 is open at both ends, the voltage VDET will be pulled up to 1V. Thus, whether the state corresponding to the horn is normal or whether a short circuit or open circuit fault between wires occurs can be detected by the principle of resistance voltage division.

Fig. 4 shows a schematic structural diagram of another prior art detection system 2. As shown in fig. 4, the detection circuit 20 in the detection system 2 is disposed between the audio power amplifier 122 and the horn 200. The detection circuit 20 includes a resistor R2, a resistor R3, a resistor R4, a resistor R5, and a resistor R6. Wherein, the first end of the resistor R2 is connected with the bias voltage end VCC, and the second end is connected with the first node P1; the first end of the resistor R3 is connected with the first node P1, and the second end of the resistor R3 is connected with the second node P2; the first end of the resistor R4 is connected with the second node P2, the second end of the resistor R4 is connected with the positive electrode port of the loudspeaker, the first end of the resistor R5 is connected with the first node P1, and the second end of the resistor R5 is connected with the ground end GND; the first end of the resistor R6 is connected to the negative electrode port of the horn 200, and the second end is connected to the ground GND.

When a bias voltage is applied to the bias voltage terminal VCC, if the horn 200 is regarded as a resistor RL, the resistor R2 and the resistor R5 form a first loop L1 connected between the bias voltage terminal VCC and the ground terminal GND; the resistor R3, the resistor R4, the resistor RL2 corresponding to the horn, and the resistor R6 form a second loop L2 connected between the bias voltage terminal VCC and the ground terminal GND.

Based on the first loop L1, a detection line can be externally connected with the first node P1 to detect the voltage separated by the resistor R5; based on the second loop L2, a detection line may be further connected to the second node P2 to detect the voltage commonly obtained by the resistor R4, the resistor RL2 corresponding to the horn, and the resistor R6, so as to detect whether the horn 200 fails by comparing the voltages detected at the first node P1 and the second node P2.

Illustratively, when a voltage of 10V is applied to the bias voltage terminal VCC, the voltage value obtained from the first node P1 may be obtained according to formula (2), and the voltage value obtained from the second node P2 may be obtained according to formula (3).

In the formula (2), VDET1 represents a voltage value obtained from the first node P1, and in the formula (3), VDET2 represents a voltage value obtained from the first node P1.

As can be seen from the formulas (2) and (3), if the connection of the horn 200 is normal, the voltage value VDET1 and the voltage value VDET2 should be at an intermediate level between 0V and 10V, and the voltage value VDET1 should be greater than the voltage value VDET2; if a line-to-line short circuit occurs at both ends of the horn 200, the horn resistance RL2 will be smaller, so that the voltage value VDET1 corresponding to the occurrence of the line-to-line short circuit will not be changed, but the voltage value VDET2 will be smaller, and the difference between the voltage value VDET1 and the voltage value VDET2 will be larger; if the horn 200 is open at both ends, the second loop L2 is not current, and thus the voltage value VDET2 will be equal to the voltage value VDET1. Therefore, by comparing the voltages at the first node P1 and the second node P2, it is possible to detect whether the state corresponding to the horn is normal or a line-to-line short circuit or open circuit fault has occurred.

Both of the above-described conventional detection systems 2 shown in fig. 3 and 4 are configured to detect whether the horn 200 has failed by connecting a resistor in series with the positive electrode port of the horn 200 and pulling up the resistor to the bias voltage terminal, pulling the negative electrode port down to the ground terminal, and then using the horn 200 as a load impedance by using the resistor voltage division principle. Although the detection circuit 20 shown in fig. 3 and 4 can detect the connection state of both ends of the horn 200, it is based on the case where the audio module is not operated. If the audio module 120 is in operation, the audio positive differential output SPKP and the audio positive differential output SPKN of the audio power amplifier 122 in the audio module 120 will interfere with the detection. According to the detection voltage obtained by the detection circuit 20 shown in fig. 3 and 4, it is not known whether the voltage output by the audio power amplifier 122 or the voltage corresponding to the voltage when the loudspeaker 200 is divided as the load impedance, so that the detection circuit 20 shown in fig. 3 and 4 cannot be used for detecting the fault of the loudspeaker 200 when the audio module 120 is operated.

Fig. 5 shows a schematic diagram of another prior art detection system 2 in connection with a horn 200. As shown in fig. 5, a part of the circuits in the detection circuit 20 in the detection system 2 are the same as the structure of the detection circuit 20 shown in fig. 3, and will not be described here again. However, in the detection, whether the state corresponding to the horn is a short circuit or an open circuit between wires is determined by the audio power amplifier 122, and then the audio power amplifier 122 outputs the detection result from a port (for example, a port D shown in fig. 5), which is entirely dependent on the diagnostic function inside the audio power amplifier 122.

In addition, two wires of the audio power amplifier 122 connected with the loudspeaker 200 are also connected with a voltage acquisition circuit, and the voltage acquisition circuit is connected with a voltage comparison circuit. The voltage acquisition circuit is used for acquiring voltages corresponding to the positive electrode port and the negative electrode port of the loudspeaker 200 respectively, and the voltage comparison circuit is used for comparing the two voltages, so that when bias voltage is applied, whether the connection state of the two ends of the loudspeaker is short-circuited to a power supply or short-circuited to ground is detected according to the output result of the voltage comparison circuit. Although fig. 5 above is a diagram of fig. 3 and 4, it is possible to detect whether the horn is shorted to the power supply or to the ground, but it is also applicable only to the case where the audio module 120 is not operated, and it is not possible to detect the horn failure when the audio module 120 is operated.

Therefore, a detection system capable of detecting a speaker when the audio module is in operation is needed.

In view of the above, the present application provides a detection system, in which a detection circuit in the detection system collects a first current transmitted between an audio positive differential output terminal of an audio power amplifier and a positive electrode port of a speaker and a second current transmitted between an audio negative differential output terminal and a negative electrode port of the speaker, and then provides first information to a processor according to the first current and the second current, so that the processor can determine whether the speaker circuit has a first failure. In the detection system, when the audio module works, the direct current signal and the alternating current signal output by the audio power amplifier do not interfere with current collection, so that the circuit can realize fault detection on the loudspeaker when the audio module works.

The following describes the detection system 2 according to the embodiment of the present application in detail with reference to fig. 6 to 14.

Fig. 6 shows a schematic diagram of connection between the detection system 2 and the loudspeaker 200 according to an embodiment of the present application. The detection system 2 is connected to a horn 200.

As shown in fig. 6, the detection system 2 includes a processor 110 and an audio module 120 connected, and a detection circuit 20 connected to both the processor 110 and the audio module 120, the audio module 120 including an audio power amplifier 122 having an audio positive differential output SPKP and an audio differential output SPKN, the speaker 200 having a positive port and a negative port, the audio positive differential output SPKP being electrically connected to the positive port of the speaker 200, the audio negative differential output SPKN being electrically connected to the negative port of the speaker 200, the processor 110 being configured to generate and provide audio signals to the speaker 200 via the audio module 120, the speaker 200 being configured to convert the audio signals to sound signals and play.

In an embodiment of the present application, the audio module 120 may further generally include an audio decoder 121, where an input end of the audio decoder 121 is electrically connected to the processor 110, and an output end of the audio decoder is electrically connected to the audio power amplifier 122. At this time, the processor 110 is configured to generate an audio signal, provide the audio signal to the audio decoder 121 for decoding, amplify the audio signal by the audio power amplifier 122, and transmit the amplified audio signal to the loudspeaker 200.

The detection circuit 20 is configured to collect a first current transmitted between the audio positive differential output SPKP and the positive port, and to collect a second current transmitted between the negative port and the audio negative differential output.

The detection circuit 20 is further configured to provide first information to the processor 110 based on the first current and the second current, the first information being used by the processor 110 to determine whether the horn circuit 10 has a first failure.

Optionally, in an embodiment of the present application, the first fault includes a horn shorting to power or a horn shorting to ground.

According to the detection system provided by the embodiment of the application, the detection circuit in the detection system is used for collecting the first current transmitted between the audio positive differential output end of the audio power amplifier and the positive electrode port of the loudspeaker and the second current transmitted between the audio negative differential output end and the negative electrode port of the loudspeaker, and then the first information is provided for the processor according to the first current and the second current, so that the processor can judge whether the loudspeaker circuit has the first fault or not. In the detection system, when the audio module works, the direct current signal and the alternating current signal output by the audio power amplifier do not interfere with current collection, so that the circuit can realize fault detection on the loudspeaker when the audio module works.

Alternatively, in an embodiment of the present application, the detection circuit 20 in fig. 6 may include:

A first current collection circuit 210 connected in series between the audio positive differential output SPKP and the positive port, and a second current collection circuit 220 connected in series between the audio negative differential output SPKN and the negative port.

The first current acquisition circuit 210 is configured to acquire a first current transmitted by the audio positive differential output SPKP and the positive port and provide the first current to the processor 110. The second current collection circuit 220 is configured to collect a second current transmitted between the negative electrode port and the audio negative differential output terminal SPKN and provide the second current to the processor 110.

It should be appreciated that at this time, the first information includes a first current and a second current, and the detection circuit 20 provides the first current and the second current to the processor 110, and the processor 110 can determine whether the first fault occurs in the horn circuit 10 according to the first current and the second current.

It should be appreciated that when the audio module 120 is operated in conjunction with fig. 6, a circuit loop formed between the audio positive differential output SPKP, the speaker 200, and the audio negative differential output SPKN of the audio power amplifier 122 is conducted, and the speaker 200 may be regarded as a load impedance RL connected in series in the circuit loop. Therefore, according to the principle that the currents are equal everywhere, the first current transmitted between the audio positive differential output end SPKP and the positive electrode port and the second current transmitted between the negative electrode port and the audio negative differential output end SPKN should be opposite, the current values should be equal, and neither should be zero, and at the same time, the current values passing through the loudspeaker 200 should be equal.

As an example, if the horn 200 is shorted to ground, a circuit loop is formed in which the horn 200 is connected to the ground GND, and a current branch is formed, resulting in a first current having a larger magnitude than a second current.

As another example, if the horn 200 is shorted to a power source, a circuit loop is formed in which the power source is connected to the horn 200, increasing the current, resulting in a second current having a magnitude greater than the first current.

Accordingly, the processor 110 may compare the first current collected by the first current collection circuit 210 with the second current collected by the second current collection circuit 220, so that when the audio module 120 is operated, it may be determined whether the speaker 200 has a fault of short-circuiting to ground or short-circuiting to a power supply according to the magnitudes of the first current and the second current.

Optionally, fig. 7 shows a schematic diagram of connection between another detection system 2 and a loudspeaker 200 according to an embodiment of the present application. As shown in fig. 7, on the basis of fig. 6, the detection circuit 20 further includes: a current comparison circuit 230 having three connection ports. As shown in fig. 7, the three connection ports are m1, m2, and m3, respectively.

The three connection ports of the current comparing circuit 230 are electrically connected to the first current collecting circuit 210, the second current collecting circuit 220, and the processor 110, respectively.

The current comparison circuit 230 is configured to determine a current difference between the first current and the second current and provide the current difference to the processor 110, and the processor 110 is configured to determine whether the first fault occurs in the horn circuit 10 according to the current difference between the first current and the second current.

It should be appreciated that at this point the first information is the current difference between the first current and the second current.

It should be understood that, referring to fig. 7, when the audio module 120 is operated, if the first current and the second current are opposite, and the current difference is zero, it is indicated that the magnitude of the first current is equal to the second current and is not zero, and at this time, it may be determined that the horn circuit 10 has no fault of horn short to ground and horn short to power.

If the direction of the first current is opposite to that of the second current, the current difference is a positive value, and the magnitude of the first current is greater than that of the second current, the current in the circuit is split to possibly cause the magnitude of the first current to be greater than that of the second current, so that the processor 110 can determine that the horn has a fault from the short circuit of the horn to the ground; if the first current is opposite to the second current, the current difference is a negative value, and the magnitude of the first current is smaller than that of the second current, the first current is smaller than that of the second current only when the current is added in the circuit, and therefore the processor 110 can determine that the horn has a fault from a horn short circuit to a power supply.

On the basis of fig. 6, the added current comparison circuit 230 in fig. 7 may be used to calculate the current difference between the first current and the second current, where the processor 110 is only used to perform fault determination according to the calculated current difference, so as to reduce the calculation amount of the processor 110 and improve the processing efficiency.

In the embodiment of the present application, a current difference threshold range corresponding to different faults may be preset in the processor 110, so that after the current comparison circuit 230 determines the current difference, the processor 110 may determine the fault corresponding to the current difference according to the threshold range matched with the current difference, thereby improving the diagnosis efficiency. The current difference threshold range can be set and modified as required, and the application is not limited in this respect.

Optionally, fig. 8 shows a schematic diagram of connection between another detection system 2 and a loudspeaker 200 according to an embodiment of the present application. As shown in fig. 8, on the basis of fig. 7, the detection circuit 20 further includes: and a voltage acquisition circuit 240 connected to the positive and negative ports of the horn 200.

The voltage acquisition circuit 240 is configured to acquire a voltage difference between the positive port and the negative port of the loudspeaker 200, and the processor 110 is configured to determine whether the loudspeaker circuit has a first fault according to the first current, the second current, and the voltage difference.

It should be appreciated that at this point, the first information includes the first current, the second current, and the voltage difference.

Optionally, in an embodiment of the present application, the first fault may further include a horn open circuit or a horn inter-line short circuit.

It should be appreciated that, since the first current collecting circuit 210 is connected in series between the audio positive differential output SPKP of the audio power amplifier 122 and the positive port of the speaker 200, and the second current collecting circuit 220 is connected in series between the audio negative differential output SPKN and the negative port of the speaker 200, the first current collecting circuit 210, the speaker 200 and the second collecting circuit 220 form a circuit loop connected in series, and the voltage between the audio positive differential output SPKP and the audio differential output SPKN of the audio power amplifier 122 is divided. At this time, the voltage collected by the voltage collection circuit 240 connected to the positive and negative ports of the horn 200 is not the voltage output from the audio power amplifier 122, but the voltage that the horn 200 divides when acting as a load impedance. Therefore, the voltage acquisition circuit 240 can accurately acquire the voltage that the loudspeaker 200 divides when acting as a load impedance during the operation of the audio module 120, without being affected by the output of the audio power amplifier 122.

Referring to fig. 8, when the audio module 120 is in operation, if the voltage difference acquired by the voltage acquisition circuit 240 is close to zero, it is indicated that the voltage difference is particularly small due to the occurrence of the short circuit of the loudspeaker 200, so that the processor 110 can determine that the fault of the short circuit between the loudspeaker wires occurs in the loudspeaker circuit 10; if the voltage difference is particularly large, even close to the voltage difference output by the audio module 120, it indicates that the loudspeaker is open, and thus, the processor 110 may determine that the loudspeaker open fault occurs; if the voltage difference is greater than zero and less than the voltage output by the audio module 120, the speaker is indicated to be operating normally, and thus the processor 110 can determine that the speaker is operating normally.

Since the voltage difference may not distinguish between the normal operation of the loudspeaker 200 and the short circuit between the horns when the loudspeaker 200 is used as a load impedance, the voltage difference determined in fig. 8 and the current difference determined in fig. 6 or 7 may be combined to perform fault determination for more accurate detection.

For example, if the horn 200 is short-circuited between wires, the horn 200 can be used as a resistor with a resistance value smaller than the first threshold; assuming that the horn 200 is open, the circuit is considered to be still on, but the horn 200 is regarded as a resistor with a resistance value greater than the second threshold value; assuming that the loudspeaker 200 is operating normally, the loudspeaker 200 may be regarded as a resistor having a resistance greater than the first threshold but less than the second threshold.

Referring to fig. 8, when the audio module 120 is in operation, if the first current collected by the first current collection circuit 210 and the second current collected by the second current collection circuit 220 are opposite in direction and equal in magnitude, the first current should also be equal to the current value passing through the loudspeaker 200, so the processor 110 may calculate the ratio of the voltage difference to the first current or the ratio of the voltage difference to the second current according to the measured voltage difference between the positive electrode port and the negative electrode port of the loudspeaker 200, to be regarded as the ratio of the voltage difference to the current value passing through the loudspeaker 200, thereby obtaining the loudspeaker resistance RL corresponding to the loudspeaker 200, and then determine whether the first fault occurs according to the calculated loudspeaker resistance RL.

Thus, if the calculated horn resistance RL is greater than the second threshold, indicating that a horn open fault occurs; if the calculated horn resistance RL is smaller than a first threshold value, indicating that a short circuit fault between horn wires occurs; and if the calculated horn resistance RL is larger than the first threshold value and smaller than the second threshold value, the horn is indicated to work normally.

In the embodiment of the present application, the magnitudes of the first threshold and the second threshold may be set and modified as required, which is not limited in any way.

In combination with the above example, the processor 110 can determine whether a fault occurs in which the horn is shorted to ground or the horn is shorted to the power source according to the current difference between the first current and the second current, and can accurately determine whether a fault occurs in which the horn is shorted between wires or the horn is opened according to the voltage difference.

The detection circuit 20 of fig. 6 to 8 can solve various problems that may occur when the audio module 120 is operating normally, but when the audio module 120 is not operating normally, for example, there is no audio signal input or no audio signal output, it cannot be judged whether the first fault occurs in the speaker 200, so the embodiment of the application provides a detection circuit 20 to solve the problem.

Fig. 9 shows a schematic structural diagram of another detection system 2 and a loudspeaker 200 according to an embodiment of the present application. As shown in fig. 9, the processor 110 is configured to generate, in addition to the audio signal, a sub-audio signal having a frequency different from that of the audio signal and output to the speaker 200 through the audio module 120.

Thus, when the loudspeaker 200 plays without sound, the processor 110 may determine whether the loudspeaker has the first fault according to the first current collected by the first current collecting circuit 210, the second current collected by the second current collecting circuit 220, and the voltage difference collected by the voltage collecting circuit 240 during transmission of the sub-audio signal.

It should be appreciated that the frequency of the audio signal is typically between 200Hz and 4.3kHz, and that when the processor 110 generates the audio signal and transmits it to the loudspeaker 200 via the audio module 120, the loudspeaker 200 may be converted into sound audible to the human ear, while the frequency of the sub-audio signal is typically less than 10Hz or greater than 20kHz, and not perceptible to the human ear when the processor 110 transmits the generated sub-audio signal to the loudspeaker 200 via the audio module 120.

Based on this principle, the processor 110 in the embodiment of the present application may generate a sub-audio signal while generating an audio signal, or may cause the processor 110 to generate a sub-audio signal during silent audio playing, so that when the audio module 120 works normally, the loudspeaker 200 plays a sound signal converted from the audio signal, and the sub-audio signal does not cause interference; when the loudspeaker 200 is playing without sound, the audio module 120 has no audio signal input or no audio signal output, but the sub-audio signal can still be normally transmitted, so that whether the loudspeaker has the first fault can be judged by detecting the first current collected by the first current collection circuit 210, the second current collected by the second current collection circuit 220 and the voltage difference value collected by the voltage collection module 240 when the sub-audio signal is transmitted.

Optionally, fig. 10 shows a schematic diagram of connection between the detection system 2 and the loudspeaker 200 according to an embodiment of the present application. As shown in fig. 10, on the basis of fig. 8 or 9, the detection circuit 20 may further include: and the bias circuit 250 is electrically connected with the audio positive differential output end SPKP and the audio negative differential output end SPKN respectively.

Referring to fig. 10, when the audio module 120 is not in operation, the bias circuit 250 is configured to apply a bias voltage to the circuit loops where the first current collecting circuit 210, the loudspeaker 200 and the second current collecting circuit 220 are located, and the processor 110 is configured to determine whether the loudspeaker 200 has a first fault according to the first current collected by the first current collecting circuit 210, the second current collected by the second current collecting circuit 220 and the voltage difference value collected by the voltage collecting circuit 240 when the bias voltage is applied.

It should be appreciated that, if the audio module 120 is powered on for the first time, or when the audio module 120 is in fault protection and does not work, after the bias voltage is applied to the bias circuit 250, the circuit loop formed by the first current collecting circuit 210, the loudspeaker 200 and the second current collecting circuit 220 between the audio positive differential output end SPKP and the audio differential output end SPKN of the audio power amplifier 122 is turned on, so that whether the loudspeaker 200 has the first fault can be determined according to the first current collected by the first current collecting circuit 210, the second current collected by the second current collecting circuit 220 and the voltage difference value collected by the voltage collecting circuit 240. Here, the process of determining whether the first fault occurs may refer to the descriptions of fig. 6 to 9, and will not be repeated herein for brevity.

The overall structure of the detection system 2 is described above with reference to fig. 6 to 10, and each part of the structure of the detection circuit 20 will be described in detail with reference to fig. 11 to 14.

Optionally, fig. 11 shows a schematic diagram of connection between the detection system 2 and the loudspeaker 200 according to an embodiment of the present application. As shown in fig. 11, the first current acquisition circuit 210 in the detection circuit 20 includes: a first resistor R11 and a first differential operational amplifier OP1.

The first resistor R11 is connected in series between the audio positive differential output end SPKP and the positive electrode port, and two input ends of the first differential operational amplifier OP1 are respectively and electrically connected with two ends of the first resistor R11; the first differential operational amplifier OP1 is configured to determine a first voltage difference across the first resistor R11 and provide the first voltage difference to the processor 110, and the processor 110 is configured to determine the first current i_ SPKP according to the first voltage difference and the first resistor R11.

It should be understood that the first voltage difference value at two ends of the first resistor R11 determined by the first differential operational amplifier OP1 is the voltage division of the first resistor R11, and the ratio of the first voltage difference value to the first resistor R11 is calculated according to ohm's law, that is, the current value passing through the first resistor R11, that is, the first current i_ SPKP transmitted between the audio positive differential output end SPKP and the positive electrode port of the loudspeaker 200.

The first current acquisition circuit 210 in fig. 11 is described in detail below. Fig. 12 shows a schematic diagram of a first current acquisition circuit 210. As shown in fig. 12, on the basis of fig. 11, the first current acquisition circuit 210 may further include: resistor R21, resistor R22, resistor R23, resistor R24, capacitor C1, and capacitor C2. The circuit formed by the resistor R21, the resistor R22, the resistor R23, the resistor R24, the capacitor C1, the capacitor C2, and the first differential operational amplifier OP1 is referred to as a first operational amplifier circuit 211.

The resistor R21 is connected in series between the first end a of the first resistor R11 and the inverting input terminal (shown as "-" in fig. 12) of the first differential operational amplifier OP1, the resistor R22 is connected in series between the second end b of the first resistor R11 and the non-inverting input terminal (shown as "+" in fig. 12) of the first differential operational amplifier OP1, the resistor R23 is connected in series between the inverting input terminal and the output terminal of the first differential operational amplifier OP1, the capacitor C1 is connected in parallel to the resistor R23, the resistor R24 is connected in series between the non-inverting input terminal of the first differential operational amplifier OP1 and the feedback voltage terminal VREF, and the capacitor C2 is connected in parallel to the resistor R24.

The calculation principle of the first operational amplifier circuit 211 will be described below.

In the example shown in fig. 12, as can be seen from the broken (assuming the first differential operational amplifier is internally open), the current through the resistor R21 is equal to the current through the resistor R23, and the current through the resistor R22 is equal to the current through the resistor R24, whereby the following formulas (3) and (4) can be listed:

In the formula (3), va represents a voltage value at a first end a of the first resistor R11, V-represents a voltage value at an inverting input terminal of the first differential operational amplifier OP1, vout represents a voltage value at an output terminal of the first differential operational amplifier OP1, vb represents a voltage value at a second end b of the first resistor R11, v+ represents a voltage value at a non-inverting input terminal of the first differential operational amplifier OP1, and Vref represents a voltage value at a feedback voltage terminal Vref.

If r21=r23 is set, the formula (3) is simplified to obtain the formula (5);

if r22=r24 is set, the formula (4) is simplified to obtain a formula (6);

And equation (7) is obtained from the virtual short (assuming a short circuit between the two inputs of the first differential operational amplifier);

V+＝V- (7)

equation (8) can be obtained by combining equation (5), equation (6) and equation (7);

Vout＝Vb-Va+Vref (8)

If the value of Vref is assumed to be 0, then simplifying equation (8) yields equation (9);

Vout＝Vb-Va (9)

According to the formula (9), the voltage value output from the output terminal of the first differential operational amplifier OP1 in the first operational amplifier 211 is the first voltage difference between the two ends of the first resistor R11.

It should be understood that the foregoing is merely an illustration of the first operational amplifier circuit 211, and other structures having the same functions as those of the first operational amplifier circuit 211 are not described herein in detail, but all the structures are within the scope of the present application.

Optionally, in an embodiment of the present application, as shown in fig. 11, the second current collecting circuit 220 in the detecting circuit 20 includes: a second resistor R12 and a second differential operational amplifier OP2. The second resistor R12 is equal to the first resistor R11.

The second resistor R12 is connected in series between the audio negative differential output end SPKN and the negative electrode port, and two input ends of the second differential operational amplifier OP2 are respectively and electrically connected with two ends of the second resistor R12;

The second differential operational amplifier OP2 is configured to determine a second voltage difference across the second resistor R12 and provide the second voltage difference to the processor 110, and the processor 110 is configured to determine the second current i_spkn according to the second voltage difference and the second resistor R12.

It should be understood that the second voltage difference value at two ends of the second resistor R12 determined by the second differential operational amplifier OP2 is the voltage division of the second resistor R12, and the ratio of the second voltage difference value to the second resistor R12 is calculated according to ohm's law, that is, the current value passing through the second resistor R12, that is, the second current i_spkn transmitted between the negative electrode port of the loudspeaker 200 and the audio negative differential output terminal SPKN.

It should be understood that, similar to the first current collecting circuit 210 in fig. 12, the second current collecting circuit 220 may further include other devices and form a second operational amplifier circuit with the second differential operational amplifier OP2, and the second operational amplifier circuit may have the same structure as the first operational amplifier circuit 211 in fig. 12 or may be different, and if they are the same, the calculation principles of the two may be the same, which is not described herein again.

The following describes a specific procedure when the detection circuit 20 detects a fault, in conjunction with fig. 13, in which the horn 200 in fig. 11 has a horn short to ground and a horn short to power failure.

Fig. 13 (a) shows an equivalent structural schematic diagram of the horn 200 of fig. 11 in which a horn short to ground fault occurs. As shown in fig. 13 (a), when the negative electrode port of the horn 200 is shorted to the ground, it is equivalent to connecting the negative electrode port of the horn 200 to the ground GND. The loss between the negative electrode port and the ground GND is equivalent to the first equivalent resistor RS1, and the current between the negative electrode port and the ground GND is denoted as i_s1.

Referring to fig. 13 (a), a first current i_ SPKP transmitted between the audio positive differential output terminal SPKP and the positive electrode port of the speaker 200 is divided into two paths after passing through the speaker 200, one path is a second current i_spkn transmitted between the negative electrode port of the speaker 200 and the audio negative differential output terminal SPKN, and the other path is a current i_s1 transmitted between the negative electrode port and the ground GND, so that the following formula (10) can be obtained;

I_SPKP＝I_RL＝I_SPKN+I_S1 (10)

As can be seen from equation (10), when the negative port of the horn 200 is shorted to ground, the first current i_ SPKP will be greater than the second current i_spkn. It should be understood that when the positive electrode port of the horn 200 is shorted to the ground, the equivalent structural schematic diagram of the circuit is similar to the schematic diagram of the negative electrode port of the horn shorted to the ground, and the magnitude of the first current i_ SPKP is still greater than the second current i_spkn, which is not described herein.

Based on this, subsequently, upon detection, if it is determined that the first current i_ SPKP is greater than the second current i_spkn, a fault is indicated that the horn is shorted to ground.

Fig. 13 (b) shows an equivalent structural schematic of the horn of fig. 11 from the occurrence of a horn short circuit to a power failure. As shown in fig. 13 (b), when the positive electrode port of the horn circuit 10 is shorted to the power supply BAT, the positive electrode port of the horn 200 is connected to the high level. The loss between the power supply BAT and the positive electrode port is equivalent to a second equivalent resistor RS2, and the current between the power supply BAT and the positive electrode port is denoted as i_s2.

Referring to fig. 13 (b), the first current i_ SPKP is combined with i_s2 before passing through the horn 200, and then is transmitted back to the negative differential output terminal SPKN after passing through the horn 200, so as to obtain the following formula (11);

I_ SPKP +i_s2=i_rl=i_spkn formula (11)

As can be seen from the formula (11), when the positive electrode port of the horn 200 is shorted to the power source, the first current i_ SPKP is smaller than the second current i_spkn. It should be understood that when the negative electrode port of the speaker 200 is shorted to the power source, the equivalent structure of the circuit is similar to the above-mentioned schematic of shorting the negative electrode port of the speaker 200 to the ground, and the magnitude of the first current i_ SPKP is smaller than the second current i_spkn, which is not repeated herein.

Based on this, subsequently, upon detection, if it is determined that the first current i_ SPKP is less than the second current i_spkn, it is indicated that the horn circuit 10 has failed to have a horn short circuit to the power supply.

Alternatively, in the embodiment of the present application, as shown in fig. 11, the current comparing circuit 230 in the detecting circuit 20 includes: and a third differential operational amplifier OP3.

Two input ends of the third differential operational amplifier OP3 are electrically connected with the output end of the first differential operational amplifier OP1 and the output end of the second differential operational amplifier OP2 respectively.

The third differential operational amplifier OP3 is configured to determine a third voltage difference between the first voltage difference and the second voltage difference and provide the third voltage difference to the processor 110, and the processor 110 is configured to determine the current difference according to the third voltage difference, the first resistor R11, or the second resistor R12.

It should be understood that the third voltage difference determined by the third differential operational amplifier OP3 is a difference between the voltage division of the first resistor R11 and the voltage division of the second resistor R12. When the third voltage difference is positive, it indicates that the voltage division of the first resistor R11 is greater than the voltage division of the second resistor R12, and since the first resistor R11 is equal to the second resistor R12, the processor 110 calculates the ratio of the third voltage difference to the first resistor R11 (or the second resistor R12) according to ohm's law, so as to obtain a current difference, and the current difference should be positive.

The current difference can be calculated according to the following formula (12):

Wherein Δi represents a current difference value, Δv1 represents a first voltage difference value, Δv2 represents a second voltage difference value, and Δv3 represents a third voltage difference value. Based on this, if the processor 110 determines that the current difference Δi is a positive value according to the third voltage difference Δv3 at the time of detection, it indicates that a fault that the horn is shorted to ground occurs.

Similarly, when the third voltage difference is negative, it means that the voltage division of the first resistor R11 is smaller than the voltage division of the second resistor R12, and since the first resistor R11 is equal to the second resistor R12, the processor 110 calculates the ratio of the third voltage difference Δv3 to the first resistor R11 (or the second resistor R12) according to ohm's law, so as to obtain the current difference Δi, where the current difference Δi is negative. Based on this, if the processor 110 determines that the current difference Δi is a negative value according to the third voltage difference Δv3 at the time of detection, it indicates that a fault occurs in which the horn is shorted to the power supply.

When the third voltage difference Δv3 is zero, it indicates that the voltage division of the first resistor R11 is equal to the voltage division of the second resistor R12, and the corresponding current difference Δi should be zero, based on this, when the processor 110 determines that the current difference Δi is zero according to the third voltage difference Δv3 during the subsequent detection, it indicates that the first fault does not occur.

It should be understood that, similar to the first current collecting circuit 210 of fig. 12, the current comparing circuit 230 may further include other devices and form a third operational amplifier circuit with the third differential operational amplifier OP3, and the third operational amplifier circuit may have the same structure as the first operational amplifier circuit 211 of fig. 12 or may be different from the first operational amplifier circuit, and if the third operational amplifier circuit and the third operational amplifier circuit are the same, the calculation principles of the third operational amplifier circuit and the first operational amplifier circuit are the same, and will not be repeated herein.

Alternatively, in an embodiment of the present application, as shown in fig. 11, the voltage acquisition circuit 240 may include: the fourth differential operational amplifier OP4, two input ends of the fourth differential operational amplifier OP4 are respectively electrically connected with the positive electrode port and the negative electrode port of the loudspeaker 200;

The fourth differential operational amplifier OP4 is used to determine a fourth voltage difference between the positive and negative ports of the horn 200 and provides the fourth voltage difference to the processor 110.

It should be understood that, in the embodiment of the present application, similar to the first current collecting circuit 210 shown in fig. 12, the voltage collecting circuit 240 may further include other devices and form a fourth operational amplifier circuit with the fourth differential operational amplifier OP4, where the fourth operational amplifier circuit may be the same as or different from the first operational amplifier circuit 211 shown in fig. 12, and if the same, the calculation principles of the two may be substantially the same, which is not described herein.

Optionally, fig. 14 shows a schematic structural diagram of yet another detection system 2 according to an embodiment of the present application. As shown in fig. 14, the bias circuit 250 in the detection circuit 20 includes: bias voltage terminal VCC, first bias resistor RT1, second bias resistor RT2, and ground terminal GND.

The first end of the first bias resistor RT1 is electrically connected with the bias voltage end VCC, the second end of the first bias resistor RT1 is electrically connected with the audio positive differential output end SPKP, the first end of the second bias resistor RT2 is electrically connected with the audio negative differential output end SPKN, and the second end of the second bias resistor RT2 is electrically connected with the ground end GND.

Optionally, in the embodiment of the present application, as shown in fig. 14, a first switch SW1 may be further connected in series between the second end of the first bias resistor RT1 and the audio positive differential output end SPKP, and a second switch SW2 may be further connected in series between the first end of the second bias resistor RT2 and the audio negative differential output end SPKN.

When a fault needs to be detected, the first switch SW1 and the second switch SW2 can be controlled to be closed simultaneously to conduct the circuit loop between the bias voltage terminal VCC and the ground terminal GND through the speaker 200, so that the speaker circuit 10 can be detected when the audio module 120 is not operating.

It should be understood that the structure illustrated in the embodiments of the present application does not constitute a specific limitation on the detection circuit 20. In other embodiments of the application, the detection circuit 20 may include more or fewer components than shown, or certain components may be combined, or certain components may be split, or a different arrangement of components may be provided. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

According to the detection system provided by the application, the first current transmitted between the audio positive differential output end of the audio power amplifier and the positive electrode port of the loudspeaker is collected through the detection circuit in the detection system, the second current transmitted between the audio negative differential output end and the negative electrode port of the loudspeaker is collected, then the first current and the second current are compared through the processor to judge whether the loudspeaker is in short circuit to the ground or in short circuit to the power supply or not, and then the voltage difference between the two ends of the loudspeaker is combined to detect whether the loudspeaker circuit is in short circuit or not. Because the direct current signal and the alternating current signal output by the audio power amplifier do not interfere with the collection of current and voltage when the audio module works, the circuit can realize the purpose of fault detection on the loudspeaker circuit when the audio module works.

The embodiment of the application also provides electronic equipment which comprises a detection system and a loudspeaker which are connected. The detection system is provided by the embodiment of the application.

For example, the electronic device may be a mobile phone, a tablet computer, a wearable device, a vehicle-mounted device, an Augmented Reality (AR)/Virtual Reality (VR) device, a notebook computer, an ultra-mobile personal computer (UMPC), a netbook, a Personal Digital Assistant (PDA), or the like, and the embodiment of the present application does not limit the specific type of the electronic device.

The embodiment of the application also provides a T-BOX, which comprises the detection system provided by the embodiment of the application.

Optionally, the T-BOX further comprises a horn coupled to the detection system.

The embodiment of the application also provides a vehicle which comprises the T-BOX provided by the embodiment of the application.

The embodiment of the application also provides a vehicle which comprises the T-BOX and the detection system which are connected. The detection system is provided by the embodiment of the application.

Optionally, the vehicle further comprises a horn connected to the detection system.

It should be understood that, for the vehicle-mounted device, an external interface is generally provided, and the external interface is electrically connected with the T-BOX, so that the vehicle manufacturer requires the external interface to implement fault diagnosis and report in time when a fault occurs. Therefore, in the embodiment of the application, after the detection system determines whether the loudspeaker has a fault, the detection result can be reported through the external interface electrically connected with the T-BOX.

It should be understood that the above description is only intended to assist those skilled in the art in better understanding the embodiments of the present application, and is not intended to limit the scope of the embodiments of the present application. It will be apparent to those skilled in the art from the foregoing examples that various equivalent modifications or variations can be made, for example, certain steps may not be necessary in the various embodiments of the detection methods described above, or certain steps may be newly added, etc. Or a combination of any two or more of the above. Such modifications, variations, or combinations are also within the scope of embodiments of the present application.

It should also be understood that the foregoing description of embodiments of the present application focuses on highlighting differences between the various embodiments and that the same or similar elements not mentioned may be referred to each other and are not repeated herein for brevity.

It should be further understood that the sequence numbers of the above processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic of the processes, and should not be construed as limiting the implementation process of the embodiments of the present application.

It should be further understood that, in the embodiments of the present application, the "preset" and "predefined" may be implemented by pre-storing corresponding codes, tables or other manners that may be used to indicate relevant information in a device (including, for example, a terminal device), and the present application is not limited to a specific implementation manner thereof.

It should also be understood that the manner, the case, the category, and the division of the embodiments in the embodiments of the present application are merely for convenience of description, should not be construed as a particular limitation, and the features in the various manners, the categories, the cases, and the embodiments may be combined without contradiction.

It is also to be understood that in the various embodiments of the application, where no special description or logic conflict exists, the terms and/or descriptions between the various embodiments are consistent and may reference each other, and features of the various embodiments may be combined to form new embodiments in accordance with their inherent logic relationships.

The foregoing is merely illustrative of specific embodiments of the present application, and the scope of the present application is not limited thereto, but any changes or substitutions within the technical scope of the present application should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A detection system, wherein the detection system is coupled to a horn, the detection system comprising: the device comprises a processor and an audio module which are connected, and a detection circuit which is connected with the processor and the audio module;

The audio module comprises an audio power amplifier with an audio positive differential output end and an audio negative differential output end, the loudspeaker is provided with a positive electrode port and a negative electrode port, the audio positive differential output end is connected with the positive electrode port, and the audio negative differential output end is connected with the negative electrode port;

The detection circuit comprises a first current acquisition circuit connected in series between the audio positive differential output end and the positive electrode port, a second current acquisition circuit connected in series between the audio negative differential output end and the negative electrode port, a voltage acquisition circuit connected with the positive electrode port and the negative electrode port of the loudspeaker and a bias circuit, wherein the bias circuit is respectively connected with the audio positive differential output end and the audio negative differential output end;

when the audio module does not work, the bias circuit is used for applying bias voltage to a circuit loop where the first current acquisition circuit, the loudspeaker and the second current acquisition circuit are located, the first current acquisition circuit is used for acquiring first current transmitted between the audio positive differential output end and the positive electrode port, the second current acquisition circuit is used for acquiring second current transmitted between the negative electrode port and the audio negative differential output end, and the voltage acquisition circuit is used for acquiring voltage difference between the positive electrode port and the negative electrode port;

the detection circuit is further configured to provide first information to the processor, the first information including the first current, the second current, and the voltage difference;

The processor is used for determining whether the loudspeaker has a first fault according to the first current, the second current and the voltage difference value when the bias voltage is applied.

2. The detection system of claim 1, wherein the detection circuit further comprises: the current comparison circuit is provided with three connecting ports, and the three connecting ports of the current comparison circuit are respectively connected with the first current acquisition circuit, the second current acquisition circuit and the processor;

The current comparison circuit is used for determining a current difference value between the first current and the second current;

accordingly, the first information includes the current difference value.

3. The detection system according to claim 1 or 2, wherein the processor is further configured to generate a sub-audio signal and provide the sub-audio signal to the horn via the audio module, the sub-audio signal having a frequency different from a frequency of the audio signal.

4. The detection system of claim 2, wherein the first current acquisition circuit comprises: a first resistor and a first differential operational amplifier;

the first resistor is connected in series between the audio positive differential output end and the positive electrode port, and two input ends of the first differential operational amplifier are respectively connected with two ends of the first resistor;

The first differential operational amplifier is used for determining a first voltage difference value between two ends of the first resistor and providing the first voltage difference value to the processor, and the processor is used for determining the first current according to the first voltage difference value and the first resistor.

5. The detection system of claim 4, wherein the second current acquisition circuit comprises: a second resistor and a second differential operational amplifier, the second resistor being equal to the first resistor;

The second resistor is connected in series between the audio negative differential output end and the negative electrode port, and two input ends of the second differential operational amplifier are respectively connected with two ends of the second resistor;

the second differential operational amplifier is used for determining a second voltage difference value between two ends of the second resistor and providing the second voltage difference value to the processor, and the processor is used for determining the second current according to the second voltage difference value and the second resistor.

6. The detection system of claim 5, wherein the current comparison circuit comprises: a third differential operational amplifier;

Two input ends of the third differential operational amplifier are respectively connected with the output end of the first differential operational amplifier and the output end of the second differential operational amplifier;

the third differential operational amplifier is configured to determine a third voltage difference between the first voltage difference and the second voltage difference and provide the third voltage difference to the processor, and the processor is configured to determine the current difference based on the third voltage difference, the first resistor, or the second resistor.

7. The detection system of claim 1, wherein the first current acquisition circuit comprises: a first resistor and a first differential operational amplifier;

8. The detection system of claim 3, wherein the first current acquisition circuit comprises: a first resistor and a first differential operational amplifier;

9. The detection system according to claim 7 or 8, wherein the second current acquisition circuit comprises: a second resistor and a second differential operational amplifier, the second resistor being equal to the first resistor;

10. The detection system of claim 1, wherein the voltage acquisition circuit comprises: the two input ends of the fourth differential operational amplifier are respectively connected with the positive electrode port and the negative electrode port of the loudspeaker;

The fourth differential operational amplifier is configured to determine a fourth voltage difference between the positive port and the negative port of the horn and provide the fourth voltage difference to the processor.

11. The detection system of claim 1, wherein the biasing circuit comprises: the bias voltage end, the first bias resistor, the second bias resistor and the grounding end;

The first end of the first bias resistor is connected with the bias voltage end, the second end of the first bias resistor is connected with the audio positive differential output end, the first end of the second bias resistor is connected with the audio negative differential output end, and the second end of the second bias resistor is connected with the ground end.

12. The detection system of claim 1, wherein the first fault comprises a horn short to power, a horn short to ground, a horn open, or a horn-to-horn short.

13. An electronic device comprising a detection system and a horn connected, wherein the detection system is a detection system according to any one of claims 1-12.

14. A T-BOX comprising the detection system of any one of claims 1-12.

15. The T-BOX of claim 14, further comprising a horn coupled to the detection system.

16. A vehicle comprising a T-BOX according to claim 14 or 15.

17. A vehicle comprising a T-BOX and a detection system connected, wherein the detection system is a detection system according to any one of claims 1-12.

18. The vehicle of claim 17, further comprising a horn coupled to the detection system.