CN111277940A - Loudspeaker detection circuit, method and loudspeaker circuit - Google Patents
Loudspeaker detection circuit, method and loudspeaker circuit Download PDFInfo
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- CN111277940A CN111277940A CN202010076253.2A CN202010076253A CN111277940A CN 111277940 A CN111277940 A CN 111277940A CN 202010076253 A CN202010076253 A CN 202010076253A CN 111277940 A CN111277940 A CN 111277940A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R29/00—Monitoring arrangements; Testing arrangements
- H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers
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Abstract
The application relates to a horn detection circuit, a horn detection method and a horn circuit. The horn detection circuit includes a first transistor, a second transistor, and a controller. The first end of the first transistor is connected with a power supply, and the second end of the first transistor is connected with the first end of the loudspeaker. The first end of the second transistor is connected with the second end of the horn, and the second end of the second transistor is grounded. And the control end of the controller is connected with the third end of the first transistor and the third end of the second transistor and is used for sending control signals to the third end of the first transistor and the third end of the second transistor. The sense terminal of controller connect in the first end of loudspeaker with between the second end of loudspeaker, be used for detecting whether loudspeaker are in operating condition, and detect the voltage at loudspeaker both ends, in order to confirm the state of loudspeaker. The utility model provides a loudspeaker detection circuitry has lower cost.
Description
Technical Field
The application relates to the technical field of circuit detection, in particular to a loudspeaker detection circuit, a loudspeaker detection method and a loudspeaker circuit.
Background
With the development and progress of scientific technology, the automobile industry is developing towards the direction of intelligent environmental protection, for example: the advent of shared bicycles and shared automobiles. The existing shared bicycle and the shared automobile have a key function of guiding a user to operate through voice. The loudspeaker is a commonly used sounding device during voice guidance, but the loudspeaker is a vulnerable device, the state of the loudspeaker needs to be detected in time, and the loudspeaker can be maintained in time when abnormal.
In the conventional technology, a detection circuit is mainly arranged in a horn circuit to detect the state of the horn, however, such a detection circuit needs to add other data processing chips such as a DSP besides a Micro Control Unit (MCU) required for detection, and the cost is high.
Disclosure of Invention
In view of the above, it is desirable to provide a horn detection circuit, a horn detection method and a horn circuit.
In order to achieve the above object, in one aspect, an embodiment of the present application provides a horn detection circuit for detecting a state of a horn, where the horn detection circuit includes:
a first transistor, wherein a first end of the first transistor is connected with a power supply, and a second end of the first transistor is connected with a first end of the horn;
a second transistor, a first end of the second transistor is connected with a second end of the horn, and a second end of the second transistor is grounded;
a control terminal of the controller is connected with both the third terminal of the first transistor and the third terminal of the second transistor, and the controller is used for sending control signals to the third terminal of the first transistor and the third terminal of the second transistor; the sense terminal of controller connect in the first end of loudspeaker with between the second end of loudspeaker, be used for detecting whether loudspeaker are in operating condition, if loudspeaker are not in operating condition, control signal control first transistor with the second transistor switches on, the controller detects the voltage at loudspeaker both ends, in order to confirm the state of loudspeaker, the state of loudspeaker includes: horn normal and horn fault.
In one embodiment, the method further comprises the following steps:
and the anode of the diode is connected with the second end of the first transistor, and the cathode of the diode is connected with the first end of the loudspeaker.
In one embodiment, the method further comprises the following steps:
the first end of the first resistor is connected with a power supply, and the second end of the first resistor is connected with the first end of the first transistor.
In one embodiment, the detection terminal of the controller is connected between the first terminal of the first resistor and the second terminal of the first resistor, and is used for detecting the voltage across the first resistor.
In one embodiment, the method further comprises the following steps:
and a first end of the second resistor is connected with a second end of the second transistor, and a second end of the second resistor is grounded.
In one embodiment, the detection terminal of the controller is connected between the first terminal of the second resistor and the second terminal of the second resistor, and is used for detecting the voltage across the second resistor.
In another aspect, an embodiment of the present application provides a speaker circuit, including:
the horn detection circuit as described above;
the second end of the first transistor is connected with the first end of the horn, and the first end of the second transistor is connected with the second end of the horn;
the first end of the audio power amplifier chip is connected with the first end of the loudspeaker, and the second end of the audio power amplifier chip is connected with the second end of the loudspeaker;
and the master control equipment is in signal connection with the controller and is used for receiving the information of the state of the loudspeaker, which is sent by the output end of the controller.
In another aspect, an embodiment of the present application provides a method for detecting a horn by using the horn detection circuit as described above, where the method includes:
detecting whether the loudspeaker is in a working state;
if the loudspeaker is not in a working state, the controller sends a first control signal to a third end of the first transistor and a third end of the second transistor, and the first control signal is used for controlling the first transistor and the second transistor to be conducted;
the controller detects the voltage at two ends of the horn;
judging the state of the loudspeaker according to the voltage, wherein the state of the loudspeaker comprises the following steps: horn normal and horn fault.
In one embodiment, the determining the state of the horn according to the voltage includes:
if the voltage is within a preset range, the state of the loudspeaker is normal;
and if the voltage is not in the preset range, the state of the horn is a horn fault.
In one embodiment, the determining the state of the horn according to the voltage further includes:
and if the voltage is zero, the state of the horn is horn open circuit.
In one embodiment, the method further comprises:
and if the loudspeaker is in a working state, the controller sends a second control signal to the third end of the first transistor and the third end of the second transistor to control the first transistor and the second transistor to be cut off.
The embodiment of the application provides a loudspeaker detection circuit, a method and a loudspeaker circuit, wherein the loudspeaker detection circuit is used for detecting the state of a loudspeaker. The horn detection circuit can realize the function of detecting the state of the horn only by using the first transistor, the second transistor and the controller, and does not need to add a data processing chip such as a high-cost GSP (general purpose processor), so that the cost can be reduced. The loudspeaker detection circuit provided by the embodiment is simple in structure and easy to realize. Simultaneously, use first transistor with second transistor control loudspeaker detection circuitry's break-make, convenient operation is simple, easy control break-make, and, first transistor with the second transistor break-make is rapid, and withstand voltage wide range can improve loudspeaker detection circuitry's practicality.
Drawings
Fig. 1 is a schematic structural diagram of a horn detection circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a horn detection circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a horn detection circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a horn detection circuit according to an embodiment of the present disclosure;
FIG. 5 is a flowchart illustrating steps of a method for detecting a horn according to an embodiment of the present disclosure;
fig. 6 is a flowchart illustrating steps of a method for detecting a horn according to an embodiment of the present disclosure.
Description of reference numerals:
10. a horn detection circuit;
20. a horn;
30. an audio power amplifier chip;
40. a master control device;
100. a first transistor;
200. a second transistor;
300. a controller;
400. a diode;
500. a first resistor;
600. a second resistor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be considered as limiting the present application.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
The horn detection circuit 10 provided by the embodiment of the application is used for detecting the state of the horn 20, and the horn 20 comprises a first end and a second end. The horn detection circuit 10 may detect whether the horn 20 is in an operating state, and may also detect whether the horn 20 has a fault or the like.
The following describes the technical solutions of the present application and how to solve the technical problems with the technical solutions of the present application in detail with specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.
Referring to fig. 1, a horn detection circuit 10 according to an embodiment of the present application includes a first transistor 100, a second transistor 200, and a controller 300.
The first transistor 100 includes a first terminal, a second terminal, and a third terminal, the second transistor 200 includes a first terminal, a second terminal, and a third terminal, and the controller 300 includes a control terminal, a detection terminal, and an output terminal.
A first terminal of the first transistor 100 is connected to a power source, and a second terminal of the first transistor 100 is connected to a first terminal of the speaker 20. In a specific embodiment, the first end of the horn 20 is a positive input end, and the second end of the horn 20 is a negative input end. The first transistor 100 may be a triode or a field effect transistor. If the first transistor 100 is an NPN type transistor, the first end of the first transistor 100 is a collector, the second end of the first transistor 100 is an emitter, and the third end of the first transistor 100 is a base. If the first transistor 100 is a field effect transistor and is an N-channel enhancement type, the first terminal of the first transistor 100 is a drain, the second terminal of the first transistor 100 is a source, and the third terminal of the first transistor 100 is a gate. The present embodiment does not set any limitation to the kind and structure of the first transistor 100 as long as the function thereof can be achieved.
A first terminal of the second transistor 200 is connected to a second terminal of the horn 20, and a second terminal of the second transistor 200 is grounded. The second transistor 200 may be a triode or a field effect transistor. For a detailed description of the second transistor 200, reference may be made to the description of the first transistor 100, which is not repeated herein.
A control terminal of the controller 300 is connected to both the third terminal of the first transistor 100 and the third terminal of the second transistor 200, and the controller 300 is configured to send control signals to the third terminal of the first transistor 100 and the third terminal of the second transistor 200. If the first transistor 100 and the second transistor 200 are both N-channel enhancement type field effect transistors, the controller 300 sends a high-level control signal to the gate of the first transistor 100 and the gate of the second transistor 200 through the control terminal of the controller 300, so that the first transistor 100 and the second transistor 200 are turned on, and at this time, the first transistor 100, the horn 20 and the second transistor 200 form a detection circuit. The detection terminal of the controller 300 is connected between the first terminal of the horn 20 and the second terminal of the horn 20. The controller 300 is configured to detect an operating state of the speaker 20, and determine whether the speaker 20 is in the operating state. If the horn 20 is in a working state, the controller 300 detects the voltage across the horn 20 through the detection end of the controller 300, and determines the state of the horn 20 through the voltage, wherein the state of the horn 20 includes horn normal state and horn fault state. The horn normal means that the horn 20 can work normally, and the horn failure means that the horn 20 itself has a failure and that the connection between the horn 20 and other devices has a failure.
In this embodiment, the controller 300 may be a micro control unit, and one pin of the micro control unit may serve as a control terminal of the controller 300 to send a control signal to the first transistor 100 and the second transistor 200. Another pin of the micro-control terminal element can be used as a detection terminal of the controller 300 to detect the working state of the loudspeaker 20. The micro control unit includes an ADC detection module, and the ADC detection module and a port can be used as a detection terminal of the controller 300 to detect the voltage across the speaker 20. The micro control unit may further include a General-purpose input/output (GPIO) component, a port of the GPIO component may serve as a detection end of the controller 300, the first end of the speaker 20 and the second end of the speaker 20 are connected, the GPIO interrupt mode is utilized to detect voltages at two ends of the speaker 20, if the voltages at two ends of the speaker 20 are at a high level, the state of the speaker 20 is normal, and if the voltages at two ends of the speaker 20 are at a low level, the state of the speaker 20 is a speaker fault. The controller 300 may also be a control component and a voltage detection component, the control component and the voltage detection component being in signal connection. The control component is used to send control signals to the first transistor 100 and the second transistor 200, and detect the operating state of the speaker 20. And the voltage detection component is utilized to detect the voltages at two ends of the loudspeaker 20 and send the voltages to the control component, and the control component determines the state of the loudspeaker 20 according to the voltages.
The specific working principle of the horn detection circuit 10 is as follows:
when the controller 300 detects that the horn 20 is in the non-operating state, a first control signal is sent to the third terminal of the first transistor 100 and the third terminal of the second transistor 200 through the control terminal of the controller 300 to control the first transistor 100 and the second transistor 200 to be turned on, so that the first transistor 100, the horn 20, and the second transistor 200 form a complete detection circuit. The state of the horn 20 is determined by detecting the voltage across the horn 20 through the detection terminal of the controller 300. When the controller 300 detects that the horn 20 is in the working state, the controller 300 sends a second control signal to the third terminal of the first transistor 100 and the third terminal of the second transistor 200 to control the first transistor 100 and the second transistor 200 to be turned off, so that the detection circuit is turned off to avoid affecting the normal operation of the horn 20.
According to the horn detection circuit, the horn detection method and the horn circuit, the horn detection circuit 10 is used for detecting the state of the horn 20. The horn detection circuit 10 can realize the function of detecting the state of the horn 20 only by using the first transistor 100, the second transistor 200 and the controller 300, and does not need to add a data processing chip such as a high-cost DSP, thereby reducing the cost. The horn detection circuit 10 provided by the embodiment has a simple structure and is easy to implement. Meanwhile, the first transistor 100 and the second transistor 200 are used for controlling the on-off of the horn detection circuit 10, the operation is convenient and simple, the on-off is easy to control, in addition, the on-off of the first transistor 100 and the second transistor 200 is rapid, the voltage withstanding range is wide, and the practicability of the horn detection circuit 10 can be improved.
Referring to fig. 2, in one embodiment, the horn detection circuit 10 further includes a diode 400. The anode of the diode 400 is connected to the second end of the first transistor 100, and the cathode of the diode 400 is connected to the first end of the speaker 20. In this embodiment, by using the unidirectional conduction effect, i.e. the reverse turn-off effect, of the diode 400, it can be avoided that when the speaker 20 works normally, the high voltage on the first end of the speaker 20 flows to the power supply through the first transistor 100, which affects the power supply, so that the practicability of the speaker detection circuit 10 can be improved.
Referring to fig. 3, in one embodiment, the horn detection circuit 10 further includes a first resistor 500. A first terminal of the first resistor 500 is connected to a power source, and a second terminal of the first resistor 500 is connected to a first terminal of the first transistor 100. In this embodiment, the current of the power supply reenters the first transistor 100 through the first resistor 500, so that the current entering the first transistor 100 is small, and thus the first transistor 100 can be protected, and the reliability and the practicability of the horn detection circuit 10 can be improved, and the controller 300 can determine the voltage of the horn 20 according to the voltage of the power supply, the resistance of the first resistor 500, and the equivalent resistance of the horn 20, so as to determine the state of the horn 20.
Referring to fig. 3, in an embodiment, the detection terminal of the controller 300 is connected between the first terminal of the first resistor 500 and the second terminal of the first resistor 500, and is used for detecting a voltage across the first resistor 500. In this embodiment, the horn 20 may be equivalent to a resistor, the voltage across the first resistor 500 is detected by the detection terminal of the controller 300, and the controller 300 determines the voltage of the horn 20 according to the detected voltage, the equivalent resistance of the horn 20, and the resistance of the first resistor 500, so as to determine the state of the horn 20.
With continued reference to fig. 3, in one embodiment, the horn detection circuit 10 further includes a second resistor 600. A first terminal of the second resistor 600 is connected to a second terminal of the second transistor 200, and a second terminal of the second resistor 600 is grounded. In this embodiment, the second resistor 600 can protect the second transistor 200, so that the horn detection circuit 10 has higher reliability and practicability, and the controller 300 can determine the voltage of the horn 20 according to the power voltage, the resistance of the second resistor 600, and the equivalent resistance of the horn 20, so as to determine the state of the horn 20.
Referring to fig. 3, in an embodiment, the detection terminal of the controller 300 is connected between the first terminal of the second resistor 600 and the second terminal of the second resistor 600, and is used for detecting a voltage across the second resistor 600. For a detailed description of the present embodiment, reference may be made to a description of connection between the detection end of the controller 300 and the first resistor 500, which is not described herein again.
Referring to fig. 4, an embodiment of the present application provides a horn circuit, where the horn circuit includes the horn detection circuit 10, the horn 20, the audio power amplifier chip 30, and the general control device 40 as described above. The second terminal of the first transistor 100 is connected to the first terminal of the horn 20, and the first terminal of the second transistor 200 is connected to the second terminal of the horn 20. The first end of the audio power amplifier chip 30 is connected with the first end of the loudspeaker 20, and the second end of the audio power amplifier chip 30 is connected with the second end of the loudspeaker 20. The general control device 40 is in signal connection with the controller 300, and is configured to receive the information of the state of the loudspeaker 20 sent by the output end of the controller 300. If the information that the controller 300 sent the state of loudspeaker 20 that total controlgear 40 received does the loudspeaker trouble, then total controlgear 40 can inform the maintenance personal in time to handle, can improve like this the practicality of loudspeaker circuit. In this embodiment, the horn circuit includes the horn detection circuit 10, so that all the structures and beneficial effects of the horn detection circuit 10 are provided, and are not described herein again.
Referring to fig. 5, the present embodiment provides a method for detecting a horn 20 by using the horn detection circuit 10 as described above, the method including:
and S100, detecting whether the loudspeaker 20 is in a working state.
Whether the horn 20 is in operation means whether the horn 20 is sounding. The working state of the horn 20 is detected through the connection of the detection end of the controller 300 and the horn 20.
S200, if the horn 20 is not in the working state, the controller 300 sends a first control signal to the third terminal of the first transistor 100 and the third terminal of the second transistor 200, where the first control signal is used to control the first transistor 100 and the second transistor 200 to be turned on.
The non-operational state of the horn 20 means that the horn 20 is not sounding at this time. The first control signal is a signal for controlling the first transistor 100 and the second transistor 200 to be turned on. If the controller 300 detects that the horn 20 is not in the working state, the controller 300 sends a first control signal to the third terminal of the first transistor 100 and the third terminal of the second transistor 200. If the first transistor 100 and the second transistor 200 are both N-channel enhancement mode fets, the controller 300 sends a high level signal to the gate of the first transistor 100 and the gate of the second transistor 200, so that the first transistor 100 and the second transistor 200 are turned on.
S300, the controller 300 detects a voltage across the horn 20.
S400, judging the state of the horn 20 according to the voltage, wherein the state of the horn 20 comprises: horn normal and horn fault.
Because the voltage at the two ends of the horn 20 is different in the different states of the horn 20, the voltage at the two ends of the horn 20 detected by the controller 300 can be used for judging the state of the horn 20 according to the detected voltage, and the state of the horn 20 may be that the horn is normal or that the horn is failed.
The method for detecting the horn 20 by using the horn detection circuit 10 provided by the embodiment of the application judges whether the horn 20 is in the working state or not firstly by the controller 300, if the horn 20 is not in the working state, the controller 300 sends a first control signal to the third end of the first transistor 100 and the third end of the second transistor 200 to control the conduction of the first transistor 100 and the second transistor 200, so that the first transistor 100, the horn 20 and the second transistor 200 form a complete detection circuit. The state of the horn 20 is determined according to the voltage across the horn 20 detected by the controller 300. The method for detecting the horn 20 provided by this embodiment can realize the detection of the horn 20 only through the first transistor 100, the second transistor 200 and the controller 300, the horn detection circuit 10 used has a simple structure and a low cost, and the detection method of the horn 20 by the horn detection circuit 10 is convenient and simple to realize.
This embodiment relates to a possible implementation manner of determining the state of the horn 20 according to the voltage, as shown in fig. 6, S400 includes:
and S410, if the voltage is within a preset range, the state of the loudspeaker 20 is that the loudspeaker is normal.
The predetermined range is used to characterize the range of voltage values that the horn 20 can be divided into in the circuit. The horn 10 may be equivalent to a resistor, in a specific embodiment, the equivalent resistance value of the horn 20 is 4 to 8 ohms, and the voltage value that the horn 20 can be divided into in the circuit is also within a certain range, and according to the power supply voltage and the equivalent resistance value of the horn 20, the range of the voltage value that the horn 20 can be divided into may be obtained, and this range is taken as the preset range. If the voltage across the horn 20 detected by the controller 300 is within the preset range, it indicates that the state of the horn 20 at this time is horn normal.
S420, if the voltage is not within the preset range, the state of the horn 20 is a horn fault.
If the voltage across the horn 20 detected by the controller 300 is not within the preset range, it indicates that the state of the horn 20 at this time is a horn failure. The horn failure may be a failure of the horn 20 itself or a failure of the connection of the horn 20 to other components.
Continuing with fig. 6, in one embodiment, S400 further includes:
s430, if the voltage is zero, the state of the horn 20 is horn open circuit.
If the voltage across the horn 20 detected by the controller 300 is zero, i.e. no current passes through the horn 20, the state of the horn 20 is a horn fault, and the horn fault is an open circuit of the horn, i.e. the connection between the horn 20 and other devices fails. In a specific embodiment, the horn open circuit may cause a failure in connection between the first end of the horn 20 and the first end of the audio power amplifier chip 30, or may cause a failure in connection between the second end of the horn 20 and the second end of the audio power amplifier chip 30, or may cause a failure in connection between the first end of the horn 20 and the second end of the horn 20 and the first end of the audio power amplifier chip 30 and the second end of the audio power amplifier chip 30, respectively.
With continued reference to fig. 5, in one embodiment, the method for detecting the horn 20 by using the horn detection circuit 10 as described above further includes:
s500, if the speaker 20 is in the working state, the controller 300 sends a second control signal to the third terminal of the first transistor 100 and the third terminal of the second transistor 200, where the second control signal is used to control the first transistor 100 and the second transistor 200 to be turned off.
The horn 20 being in an active state means that the horn 20 is sounding at this time. The second control signal is a signal for controlling the first transistor 100 and the second transistor 200 to be turned off. If the controller 300 detects that the horn 20 is in the working state at this time, the controller 300 sends the second control signal to the third terminal of the first transistor 100 and the third terminal of the second transistor 200. If the first transistor 100 and the second transistor 200 are both N-channel enhancement mode fets, the controller 300 sends a low-level signal to the gate of the first transistor 100 and the gate of the second transistor 200, so that the first transistor 100 and the second transistor 200 are turned off. In this embodiment, when the controller 300 detects that the horn 20 is in the working state, the first transistor 100 and the second transistor 200 can be controlled to be turned off in time, so that the influence of the horn detection circuit 10 on the normal operation of the horn 20 can be avoided.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (11)
1. A horn detection circuit for detecting a state of a horn (20), the horn detection circuit (10) comprising:
a first transistor (100), wherein a first end of the first transistor (100) is connected with a power supply, and a second end of the first transistor (100) is connected with a first end of the horn (20);
a second transistor (200), wherein a first end of the second transistor (200) is connected with a second end of the horn (20), and a second end of the second transistor (200) is grounded;
a controller (300), wherein a control terminal of the controller (300) is connected to both the third terminal of the first transistor (100) and the third terminal of the second transistor (200), and the controller (300) is configured to send a control signal to the third terminal of the first transistor (100) and the third terminal of the second transistor (200); the detection end of controller (300) connect in between the first end of loudspeaker (20) and the second end of loudspeaker (20), be used for detecting whether loudspeaker (20) is in operating condition, if loudspeaker (20) are not in operating condition, control signal control first transistor (100) with transistor (200) switch on, controller (300) detect the voltage at loudspeaker (20) both ends, in order to confirm the state of loudspeaker (20), the state of loudspeaker (20) includes: horn normal and horn fault.
2. The horn detection circuit of claim 1, further comprising:
a diode (400), wherein the anode of the diode (400) is connected with the second end of the first transistor (100), and the cathode of the diode (400) is connected with the first end of the loudspeaker (20).
3. The horn detection circuit of claim 1, further comprising:
a first resistor (500), a first terminal of the first resistor (500) is connected to a power supply, and a second terminal of the first resistor (500) is connected to a first terminal of the first transistor (100).
4. The horn detection circuit according to claim 3, wherein the detection terminal of the controller (300) is connected between the first terminal of the first resistor (500) and the second terminal of the first resistor (500) for detecting the voltage across the first resistor (500).
5. The horn detection circuit of claim 1, further comprising:
a second resistor (600), a first end of the second resistor (600) being connected to a second end of the second transistor (200), a second end of the second resistor (600) being grounded.
6. The horn detection circuit according to claim 5, wherein the detection terminal of the controller (300) is connected between the first terminal of the second resistor (600) and the second terminal of the second resistor (600) for detecting the voltage across the second resistor (600).
7. A horn circuit, comprising:
a horn detection circuit (10) as claimed in any one of claims 1 to 6;
a horn (20), a second terminal of the first transistor (100) being connected to a first terminal of the horn (20), a first terminal of the second transistor (200) being connected to a second terminal of the horn (20);
the first end of the audio power amplifier chip (30) is connected with the first end of the loudspeaker (20), and the second end of the audio power amplifier chip (30) is connected with the second end of the loudspeaker (20);
and the general control device (40) is in signal connection with the controller (300) and is used for receiving the information of the state of the loudspeaker (20) sent by the output end of the controller (300).
8. A method of detecting a horn using a horn detection circuit as claimed in any one of claims 1 to 6, the method comprising:
detecting whether the horn (20) is in a working state;
if the loudspeaker (20) is not in the working state, the controller (300) sends a first control signal to a third terminal of the first transistor (100) and a third terminal of the second transistor (200), and the first control signal is used for controlling the first transistor (100) and the second transistor (200) to be conducted;
the controller (300) detects a voltage across the horn (20);
judging the state of the horn (20) according to the voltage, wherein the state of the horn (20) comprises the following steps: horn normal and horn fault.
9. The method of claim 8, wherein said determining the state of said horn (20) from said voltage comprises:
if the voltage is within a preset range, the state of the loudspeaker (20) is normal;
and if the voltage is not in the preset range, the state of the horn (20) is horn failure.
10. The method of claim 9, wherein said determining a state of said horn (20) from said voltage further comprises:
and if the voltage is zero, the state of the horn (20) is horn open circuit.
11. The method of claim 8, further comprising:
if the horn (20) is in the working state, the controller (300) sends a second control signal to the third end of the first transistor (100) and the third end of the second transistor (200) to control the first transistor (100) and the second transistor (200) to be turned off.
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