Vehicle-mounted detection circuit

Abstract

The utility model discloses a vehicle-mounted detection circuit, and relates to the technical field of automobile manufacturing. The vehicle-mounted detection circuit is used for detecting the vehicle-mounted loudspeaker, the interface end is used for being connected with the vehicle-mounted audio power amplifier and the vehicle-mounted loudspeaker, and when the vehicle-mounted audio power amplifier and the vehicle-mounted loudspeaker are connected to the interface end, the vehicle-mounted audio power amplifier is connected with the vehicle-mounted loudspeaker and used for driving the vehicle-mounted loudspeaker to produce sound through the interface end; when the vehicle-mounted loudspeaker is connected to the interface end, the power supply circuit, the protection circuit and the vehicle-mounted loudspeaker form a loop through the interface end, and the protection circuit is used for protecting the loop when the vehicle-mounted loudspeaker is short-circuited; and the control circuit is connected with the loop and is used for controlling the on-off of the loop and collecting a voltage value and / or a current value for detecting the vehicle-mounted loudspeaker in the loop. According to the vehicle-mounted audio power amplifier, the transformation of the vehicle-mounted audio power amplifier is reduced, and the circuit complexity of the vehicle-mounted audio power amplifier is reduced.

Description

Technical Field

[0001] This specification relates to the technical field of automobile manufacturing, and particularly to in-vehicle detection circuits. Background Art

[0002] With the development of technology, the number of speakers in a vehicle can be increased. In the prior art, the in-vehicle speakers are mostly checked by the power amplifier chips on the power amplifier board before the in-vehicle speakers work, but this will cause the problem that the detection circuit including the power amplifier chips is relatively complex. Summary of the Utility Model

[0003] One embodiment of the present application provides an in-vehicle detection circuit for detecting in-vehicle speakers. The in-vehicle detection circuit includes: a power supply circuit; an interface terminal for connecting an in-vehicle audio power amplifier and the in-vehicle speakers. When the in-vehicle audio power amplifier and the in-vehicle speakers are connected to the interface terminal, the in-vehicle audio power amplifier is connected to the in-vehicle speakers, and the in-vehicle audio power amplifier is used to drive the in-vehicle speakers to emit sound through the interface terminal; a protection circuit. When the in-vehicle speakers are connected to the interface terminal, the power supply circuit, the protection circuit, and the in-vehicle speakers form a loop through the interface terminal. The protection circuit is used to protect the loop when the in-vehicle speakers are short-circuited; and a control circuit connected to the loop for controlling the on-off of the loop and collecting the voltage value and / or current value for detecting the in-vehicle speakers in the loop.

[0004] A further embodiment is that the control circuit is used to detect the internal resistance, short-circuit state, or open-circuit state of the in-vehicle speakers based on the voltage value and / or current value.

[0005] A further embodiment is that the power supply circuit is connected to the control circuit, and the power supply circuit is used to supply power to the control circuit.

[0006] A further embodiment is that when the in-vehicle audio power amplifier is in an unoperated state, the control circuit collects the voltage value and / or current value for detecting the in-vehicle speakers.

[0007] A further embodiment is that the protection circuit includes: a first switch and a second switch, which are respectively connected to the control circuit. The control circuit is used to control the on-off of the first switch and the on-off of the second switch; and a load circuit. When the in-vehicle speakers are connected to the interface terminal, the power supply circuit, the load circuit, the in-vehicle speakers, the first switch, and the second switch form a loop through the interface terminal.

[0008] A further embodiment is that the second switch, the interface end, and the load circuit form a branch, and the branch is connected to the in-vehicle speaker through the interface end, and there is one or more such branches.

[0009] A further embodiment is that the power supply circuit includes a high-level terminal and a low-level terminal, the load circuit includes a first load circuit and a second load circuit, the first load circuit and the first switch are connected in series between the high-level terminal and the interface end, the second load circuit and the second switch are connected in series between the low-level terminal and the interface end, and the control circuit is connected to a collection point located between the first load circuit and the interface end to collect the voltage value and / or current value for detecting the in-vehicle speaker in the loop.

[0010] A further embodiment is that the first load circuit includes a first voltage stabilizing diode; and / or, the second load circuit includes a second voltage stabilizing diode.

[0011] A further embodiment is that the load circuit further includes a third load circuit, and the third load circuit is connected in series between the collection point and the interface end.

[0012] A further embodiment is that the first switch is a current limiting switch; and / or, the second switch is a field effect transistor.

[0013] A further embodiment is that the control circuit has a collection end for collecting the voltage value and / or current value for detecting the in-vehicle speaker in the loop. There is a collection point in the loop, and the in-vehicle detection circuit further includes a resistor connected in series between the collection end and the collection point, and a capacitor connected in series between the collection end and the ground end.

[0014] By adopting the above technical solution, the present application reduces the modification of the in-vehicle audio power amplifier and reduces the circuit complexity of the in-vehicle audio power amplifier by additionally providing an in-vehicle detection circuit for detecting the in-vehicle speaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a partial structural schematic diagram of a vehicle circuit in some embodiments of the present application;

[0016] Figure 2 is Figure 1 a partial structural schematic diagram of a speaker control circuit in some embodiments of the illustrated embodiment;

[0017] Figure 3 is Figure 1 a structural schematic diagram of a speaker detection circuit in some embodiments of the illustrated embodiment;

[0018] Figure 4For Figure 1 Partial schematic diagram of the vehicle circuit in some other embodiments of the illustrated embodiment;

[0019] Figure 5 For Figure 4 Partial schematic diagram of the vehicle circuit in some other embodiments of the illustrated embodiment;

[0020] Figure 6 For Figure 5 Partial schematic diagram of the vehicle circuit in some other embodiments of the illustrated embodiment;

[0021] Figure 7 For Figure 5 Partial schematic diagram of the vehicle circuit in some other embodiments of the illustrated embodiment;

[0022] Figure 8 For Figure 6 Partial schematic diagram of the vehicle circuit in some other embodiments of the illustrated embodiment. Detailed implementation manners

[0023] To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some examples or embodiments of the present application. For those of ordinary skill in the art, without creative efforts, the present application can also be applied to other similar scenarios based on these drawings. Unless obvious from the language context or otherwise stated, the same reference numerals in the figures represent the same structure or operation.

[0024] A speaker is installed in the vehicle, and thus maintenance is required due to speaker failures. Therefore, vehicle circuit design needs to be carried out on the vehicle to detect speaker failures through the vehicle circuit. This failure detection can occur during the use of the original speakers in the vehicle, during the installation and use of new speakers replacing the failed speakers, or during the process of increasing the number of speakers. Specifically, it can be during the installation, use, etc. of in-vehicle speakers set during the process of increasing the number of speakers for failure detection.

[0025] The failure detection can detect failures such as the short-circuit state, open-circuit state, and internal resistance of the speaker. The specific failure detection of the speaker can be carried out according to the needs of those skilled in the art, and further, disposal work related to the failure can be carried out according to the detection results, which will not be elaborated here.

[0026] It can be understood that for the internal resistance detection of a speaker, it is possible to determine whether there is an internal resistance fault in the speaker. An internal resistance fault means that the internal resistance of the speaker does not meet the design requirements of the vehicle for the internal resistance of the speaker. Further, during the use of the speaker, it may cause damage to the circuit connected to the speaker or related circuits.

[0027] For example, an internal resistance fault can cause damage to the in-vehicle audio power amplifier, and even irreversible damage. Specifically, it can be the damage of the power amplifier board or the power amplifier chip on the power amplifier board in the in-vehicle audio power amplifier.

[0028] Please refer to Figure 1 and Figure 2 , Figure 1 which is a partial structural schematic diagram of the vehicle circuit 100 in some embodiments of the present application. Figure 2 is Figure 1 a partial structural schematic diagram of the speaker control circuit 10 in some embodiments of the illustrated embodiment. The vehicle circuit 100 can be all the circuits for the normal operation of an automotive vehicle. Of course, it can also be merely the circuits related to the operation of the speaker on the automotive vehicle. The vehicle circuit 100 may include a speaker control circuit 10 and a speaker detection circuit 20. The speaker control circuit 10 may include an audio power amplifier 11 and a speaker 12. The audio power amplifier 11 and the speaker 12 are connected, and the audio power amplifier 11 can drive the speaker 12 to emit sound. The speaker detection circuit 20 can be used to detect faults in the speaker 12 in the speaker control circuit 10. Among them, the speaker detection circuit 20 is independent of the speaker control circuit 10, which can reduce the circuit complexity of the speaker control circuit 10 caused by adding a fault detection function. In some embodiments, the setting of the speaker detection circuit 20 can undertake all the work of detecting faults in the speaker 12. Of course, in some embodiments, part of the work of detecting faults in the speaker 12 can also be shared by the speaker detection circuit 20, while part of the work of detecting faults in the speaker 12 is borne by the speaker control circuit 10.

[0029] As shown in the present application and the claims, unless the context clearly indicates an exceptional situation, words such as "a", "an", "one" and / or "the" are not specifically singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of the clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. A method or device may also include other steps or elements.

[0030] In some embodiments, the speaker detection circuit 20 can perform fault detections such as the short-circuit state, open-circuit state, and internal resistance of the speaker 12. In some embodiments, the internal resistance fault detection can be performed by the speaker detection circuit 20, while other fault detections such as the short-circuit state and open-circuit state of the speaker 12 are performed by the speaker control circuit 10.

[0031] Please refer to Figure 2 , the speaker control circuit 10 may have an interface terminal 101. The interface terminal 101 may be formed on the vehicle, and both the audio power amplifier 11 and the speaker 12 are connected to the interface terminal 101. Furthermore, the audio power amplifier 11 is connected to the speaker 12 through the interface terminal 101, so that the audio power amplifier 11 can drive the speaker 12 to emit sound. Of course, the interface terminal 101 may also be formed on the audio power amplifier 11, or even formed on the vehicle at the same time.

[0032] The speaker 12 may be the original speaker of the vehicle, or a new speaker replacing a faulty speaker, or even an in-vehicle speaker set during the process of increasing the number of speakers (such as Figure 4 the in-vehicle speaker 121 in). In some embodiments, both the original speaker of the vehicle and the new speaker replacing a faulty speaker can be referred to as the in-vehicle speaker 121.

[0033] The audio power amplifier 11 may be the original audio power amplifier of the vehicle, or an audio power amplifier replacing a faulty audio power amplifier, or an in-vehicle audio power amplifier cooperating with the in-vehicle speaker 121 (such as Figure 4 the in-vehicle audio power amplifier 111 in). In some embodiments, both the original audio power amplifier of the vehicle and the audio power amplifier replacing a faulty audio power amplifier can be referred to as the in-vehicle audio power amplifier 111.

[0034] Please refer to Figure 1 , the speaker detection circuit 20 may be an in-vehicle detection circuit (such as Figure 3 the in-vehicle detection circuit 201 in). The speaker detection circuit 20, such as the in-vehicle detection circuit 201, can collect the voltage value and / or current value for detecting the speaker 12, such as the in-vehicle speaker 121, to further judge the short-circuit state, open-circuit state and internal resistance and other faults of the speaker 12, such as the in-vehicle speaker 121, through the voltage value and / or current value.

[0035] Please refer to Figure 3 and Figure 4 , Figure 3 is Figure 1 the schematic structural diagram of the speaker detection circuit 20 in some embodiments of the embodiment shown in Figure 4 is Figure 1Schematic diagram of a partial structure of the vehicle circuit 100 in the illustrated embodiment in some other embodiments. The in-vehicle detection circuit 201 may include a power supply circuit 21, an interface terminal 101, a protection circuit 22, and a control circuit 23. Among them, the in-vehicle detection circuit 201 shares the interface terminal 101 with the speaker control circuit 10. After the in-vehicle speaker 121 can be connected to the interface terminal 101, the in-vehicle speaker 121 can be fault-detected through the in-vehicle detection circuit 201, and the in-vehicle speaker 121 can be driven to emit sound through the in-vehicle audio power amplifier 111. That is, when the in-vehicle speaker 121 is connected to the interface terminal 101, the power supply circuit 21, the protection circuit 22, and the in-vehicle speaker 121 form a loop 102 through the interface terminal 101. The control circuit 23 is connected to the loop 102 to control the on / off of the loop 102. In addition, the control circuit 23 can also collect the voltage value and / or current value for detecting the in-vehicle speaker 121 in the loop 102. Further, the control circuit 23 or the vehicle circuit 100 can detect faults such as short-circuit state, open-circuit state, and internal resistance of the in-vehicle speaker 121 based on the collected voltage value and / or current value. Of course, it can also be other devices different from the vehicle itself that detect faults such as short-circuit state, open-circuit state, and internal resistance of the in-vehicle speaker 121 based on the collected voltage value and / or current value.

[0036] The power supply circuit 21 can supply power to the in-vehicle detection circuit 201. The power supply circuit 21 can be an in-vehicle battery such as a storage battery or a lithium battery, or it can also be a power conversion circuit such as a voltage conversion circuit that cooperates with the in-vehicle battery. Specifically, it can be selected according to the needs of those skilled in the art.

[0037] In some embodiments, the power supply circuit 21 can supply power to the speaker control circuit 10.

[0038] The interface terminal 101 can be a terminal post, a welding end, a plug-in structure, a wiring terminal, a wiring pin, or other structures that can achieve the connection or detachable connection of two devices. Specifically, it can be selected according to the needs of those skilled in the art.

[0039] The protection circuit 22 can be used to protect the loop 102 and reduce the probability of damage to other electronic devices in the loop 102 caused by a fault of the in-vehicle speaker 121. For example, when a short-circuit fault occurs in the in-vehicle speaker 121, it is very easy to cause other electronic devices in the loop 102 to burn out due to excessive voltage or current. At this time, they will be protected under the setting of the protection circuit 22. Of course, the protection circuit 22 can also reduce the probability of a fault occurring in the loop 102 due to human operation errors. Of course, the function of the protection circuit 22 is not limited to this, and the function can also be set within the understanding of those skilled in the art.

[0040] The protection circuit 22 may include at least one of multiple electronic devices such as switches, capacitors, resistors, inductors, electronic chips, and semiconductor devices, and may specifically be set according to the selection of those skilled in the art.

[0041] The control circuit 23 may be a device or equipment with functions such as executing programs and computing tasks, and may also perform logical operations. In some embodiments, the control circuit 23 may include a Microcontroller Unit (MCU). In some embodiments, the control circuit 23 may include a single-chip microcomputer. In some embodiments, the control circuit 23 may be a circuit in the vehicle itself that has functions such as executing programs and computing tasks. In some embodiments, the control circuit 23 may be a circuit in the speaker control circuit 10 that has functions such as executing programs and computing tasks. Of course, the control circuit 23 may also be a device or equipment known to those skilled in the art that has functions such as executing programs and computing tasks.

[0042] In some embodiments, referring to Figure 4 , when the in-vehicle audio power amplifier 111 is in an unoperated state, that is, when the in-vehicle audio power amplifier 111 does not drive the in-vehicle speaker 121, the control circuit 23 may collect the voltage value and / or current value for detecting the in-vehicle speaker 121, so as to determine whether the in-vehicle speaker 121 is faulty before the in-vehicle audio power amplifier 111 operates, and reduce the damage of the in-vehicle speaker 121 to the in-vehicle audio power amplifier 111.

[0043] In some embodiments, referring to Figure 4 , when the in-vehicle audio power amplifier 111 is in an operated state, that is, when the in-vehicle audio power amplifier 111 drives the in-vehicle speaker 121, the control circuit 23 may collect the voltage value and / or current value for detecting the in-vehicle speaker 121. Among them, the speaker detection circuit 20 and the speaker control circuit 10 may have isolation and do not interfere with each other, and thus the in-vehicle speaker 121 can be monitored at any time or in real time through the control circuit 23, so as to timely detect whether the speaker control circuit 10 is faulty, so as to handle the fault early and reduce the losses caused by the fault. Further, the control circuit 23 may be a circuit in the speaker control circuit 10 that has functions such as executing programs and computing tasks. Thus, when the speaker control circuit 10 is faulty, the control circuit 23 can control the in-vehicle audio power amplifier 111 to make the in-vehicle audio power amplifier 111 in an unoperated state.

[0044] In some embodiments, the control circuit 23 has a collection end, there is a collection point in the loop 102, and the collection end of the control circuit 23 is connected to the collection point in the loop 102, so as to collect the voltage value and / or current value for detecting the in-vehicle speaker 121 at the collection point.

[0045] Referring to Figure 5 , Figure 5For Figure 4 Partial structural schematic diagram of the vehicle circuit 100 in some other embodiments of the embodiment shown. The protection circuit 22 may include a first switch 221, a second switch 222, and a load circuit 223. When the in-vehicle speaker 121 is connected to the interface terminal 101, the power supply circuit 21, the in-vehicle speaker 121, the first switch 221, the second switch 222, and the load circuit 223 form a loop 102 through the interface terminal 101. The first switch 221 and the second switch 222 cooperate to control the on / off of the loop 102. Specifically, the first switch 221 and the second switch 222 are respectively connected to the control circuit 23, and the control circuit 23 can control the on / off of the first switch 221 and can also control the on / off of the second switch 222. It can be understood that when both the first switch 221 and the second switch 222 are turned on under the control of the control circuit 23, the loop 102 is turned on, and the control circuit 23 can collect the voltage value and / or current value for detecting the in-vehicle speaker 121.

[0046] The "first", "second" and similar terms used in the description and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, terms such as "a" or "one" do not indicate a quantity limitation, but indicate that there is at least one. Unless otherwise indicated, terms such as "front part", "rear part", "lower part" and / or "upper part" are only for convenience of description and are not limited to a position or a spatial orientation. Generally speaking, the terms "comprising" and "including" only imply the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list, and the method or device may also include other steps or elements.

[0047] In some embodiments, the second switch 222, the interface terminal 101, and the load circuit 223 form a branch 103, and the branch 103 can be connected to the in-vehicle speaker 121 at the interface terminal 101.

[0048] Please refer to Figure 6 , Figure 6 For Figure 5 Partial structural schematic diagram of the vehicle circuit 100 in some other embodiments of the embodiment shown. There can be multiple branches 103, and each branch 103 can be connected to the in-vehicle speaker 121 at the interface terminal 101. The second switch 222 in each branch 103 is connected to the control circuit 23, and the control circuit 23 can control the on / off of the second switch 222 in each branch 103.

[0049] When each branch 103 is connected to the in-vehicle speaker 121 at the interface end 101, a loop 102 can be formed with the power supply circuit 21, the in-vehicle speaker 121, and the first switch 221. Furthermore, the number of branches 103 corresponds one-to-one with the number of loops 102. The control circuit 23 can control the corresponding second switch 222 to control the loop 102 and the branch 103 corresponding to the second switch 222.

[0050] Please refer to Figure 7 , Figure 7 as Figure 5 a partial structural schematic diagram of the vehicle circuit 100 in some other embodiments of the illustrated embodiment. The first switch 221 can be an electronic device with a function of controlling the on / off of the circuit, such as a current-limiting switch, a triode, an ordinary electric control switch, or a relay switch, etc. Specifically, those skilled in the art can select the type according to requirements. It can be understood that the first switch 221 can also be a circuit including an electronic device with a function of controlling the on / off of the circuit.

[0051] The second switch 222 can be an electronic device with a function of controlling the on / off of the circuit, such as a current-limiting switch, a triode, an ordinary electric control switch, or a relay switch, etc. Specifically, those skilled in the art can select the type according to requirements. It can be understood that the second switch 222 can also be a circuit including an electronic device with a function of controlling the on / off of the circuit.

[0052] In some embodiments, the triode can be a field-effect transistor. In some embodiments, the field-effect transistor can include an enhancement-mode field-effect transistor, a P-channel field-effect transistor, or an N-channel enhancement-mode field-effect transistor, etc. In some embodiments, the enhancement-mode field-effect transistor can include a P-channel enhancement-mode field-effect transistor or an N-channel enhancement-mode field-effect transistor, etc.

[0053] The power supply circuit 21 can include a high-level terminal and a low-level terminal.

[0054] Please refer to Figure 7 , the high-level terminal can be the VCC terminal, and the low-level terminal can be the GND terminal (ground terminal).

[0055] Please refer to Figure 7 , the load circuit 223 can include a first load circuit 2231 and a second load circuit 2232.

[0056] The first load circuit 2231 and the first switch 221 can be connected in series between the high-level terminal and the interface end 101. Specifically, the first load circuit 2231 and the first switch 221 (such as a current-limiting switch) can be connected in series between the VCC terminal and the interface end 101, such as the P terminal.

[0057] The second load circuit 2232 and the second switch 222 can be connected in series between the low-level terminal and the interface terminal 101. Specifically, the second load circuit 2232 and the second switch 222 can be connected in series between the GND terminal and the interface terminal 101, such as the N terminal.

[0058] It can be understood that one end of the P terminal of the interface terminal 101 can be connected to one end of the vehicle-mounted audio power amplifier 111 and one end of the vehicle-mounted speaker 121, and the O terminal can be connected to the other end of the vehicle-mounted audio power amplifier 111 and the other end of the vehicle-mounted speaker 121 to form a loop 102, or a speaker control circuit 10 can also be formed.

[0059] In addition, the acquisition point of the loop 102 is located between the first load circuit 2231 and the interface terminal 101, such as the P terminal.

[0060] In some embodiments, the load circuit 223 may further include a third load circuit 2233 connected in series in the loop 102.

[0061] In some embodiments, the third load circuit 2233 can be connected in series between the first load circuit 2231 and the interface terminal 101, such as the P terminal. Furthermore, in some embodiments, the acquisition point of the loop 102 is located between the first load circuit 2231 and the third load circuit 2233, or between the third load circuit 2233 and the interface terminal 101, such as the P terminal.

[0062] In some embodiments, the third load circuit 2233 can be connected in series between the second load circuit 2232 and the interface terminal 101, such as the O terminal.

[0063] In some embodiments, the electronic device components of the first load circuit 2231, the second load circuit 2232, and the third load circuit 2233 can be the same or different, but all can include at least one of multiple electronic devices such as capacitors, resistors, inductors, electronic chips, and semiconductor devices, and can be specifically set according to the selection of those skilled in the art. It can be understood that the resistor can also be replaced by other electronic devices with resistance.

[0064] In some embodiments, the semiconductor device can be a diode or a triode, etc. Furthermore, in some embodiments, the first load circuit 2231 can include a first zener diode D1, and / or the second load circuit 2232 can include a second zener diode D2, and / or the third load circuit 2233 can include a third zener diode. Among them, the setting of the zener diode can prevent reverse connection, and can also enhance the isolation between the speaker detection circuit 20 and the speaker control circuit 10, and has the function of protecting the speaker detection circuit 20.

[0065] Please refer to Figure 7 , the first load circuit 2231 can include a series connection of a first zener diode D1 and a resistor R2.

[0066] Please refer to Figure 7 , the second load circuit 2232 may include a second voltage regulator diode D2 and a resistor R4 connected in series.

[0067] Please refer to Figure 7 , the third load circuit 2233 may include a resistor R3.

[0068] Please refer to Figure 7 , the second switch 222 may include a triode M1.

[0069] Please refer to Figure 7 , the control circuit 23 has a collection terminal O. The vehicle-mounted detection circuit 201 may include a resistor R1 connected in series between the collection terminal O and the collection point, and a capacitor C1 connected in series between the collection terminal O and the ground terminal (GND terminal). In some embodiments, the capacitor C1 may be used as a decoupling capacitor.

[0070] Please refer to Figure 7 , the control circuit 23 may be connected to a high-level terminal such as the VCC terminal to enable the power supply circuit 21 to supply power to the control circuit 23.

[0071] Please refer to Figure 7 , the control circuit 23 takes a microcontroller unit (MCU) as an example. The collection terminal O may be an A / D pin of the microcontroller unit and can collect different voltage values or current values. Here, taking the collection of voltage values as an example. The GPIO0 pin of the microcontroller unit may be connected to the first switch 221, and the GPIO1 pin may be connected to the second switch 222.

[0072] When the in-vehicle audio amplifier 111 is in a non-operating state (of course, when the isolation degree between the speaker control circuit 10 and the speaker detection circuit 20 is sufficient, the in-vehicle audio amplifier 111 can also be in an operating state), the control circuit 23, such as the microcontroller unit, controls the first switch 221, such as a current-limiting switch, to close through the GPIO0 pin, and controls the second switch 222, such as the triode M1, to close through the GPIO1 pin. Then, the power supply circuit 21 supplies power, and the voltage may be U (such as 5v or 3.3v voltage). The voltage U can be collected at the collection point in the loop 102 A .

[0073] When the in-vehicle speaker 121 is connected to the interface terminals 101, such as both ends O and P, the internal resistance of the in-vehicle speaker 121 may be R 内 , then the voltage U A = (R3 + R4 + R 内 ) / (R2 + R3 + R4 + R 内 ) * U.

[0074] The fault judgment process of the control circuit 23 or the vehicle circuit 100 is as follows:

[0075] If the in-vehicle speaker 121 is short-circuited, the voltage U A is smaller than the standard value U A .

[0076] If the in-vehicle speaker 121 is open-circuited, the voltage U A is larger than the standard value U A , and will be equal to the voltage U;

[0077] In addition, based on the resistances of the known electronic components in the loop 102, such as the resistors R2, R3, and R4, as well as the voltages U and U A , R 内 can be calculated to determine whether R 内 meets the vehicle's design requirements for the internal resistance of the speaker, so as to further determine whether there is an internal resistance fault. Among them, R 内 meets the formula U A =(R3 + R4 + R 内 ) / (R2 + R3 + R4 + R 内 )*U.

[0078] In some embodiments, when the voltage is not collected but the current value is collected, the voltage value across the sampling resistor R 采 can be used to represent the magnitude of the current value, and the sampling resistor can be connected in series in the loop 102. Furthermore, by judging the change in the magnitude of the current, fault detection can be achieved. For example, when the collected current value is I, then U=(R3 + R4 + R 采 + R 内 )*I.

[0079] The fault judgment process of the control circuit 23 or the vehicle circuit 100 is as follows:

[0080] If the in-vehicle speaker 121 is short-circuited, the current value I is larger than the standard value I;

[0081] If the in-vehicle speaker 121 is open-circuited, the current value I is smaller than the standard value I and will be equal to 0;

[0082] In addition, based on the resistances of the known electronic components in the loop 102, such as the resistors R2, R3, and R4, as well as the voltage U and the current value I, R 内 can be calculated to determine whether R 内 meets the vehicle's design requirements for the internal resistance of the speaker, so as to further determine whether there is an internal resistance fault. Among them, R 内 meets the formula U=(R3 + R4 + R 采 + R 内 )*I.

[0083] It can be understood that the methods for fault detection are not limited to the embodiments listed herein and can also be implemented in other ways, which will not be elaborated.

[0084] Please refer to Figure 8 , Figure 8 which is Figure 6 a partial structural schematic diagram of the vehicle circuit 100 in some other embodiments of the illustrated embodiment. Among them, there can be multiple branch circuits 103, and each branch circuit 103 can be connected to the in-vehicle speaker 121 at the interface end 101. The second switch 222 in each branch circuit 103 is connected to the control circuit 23, and the control circuit 23 can control the on / off of the second switch 222 in each branch circuit 103.

[0085] Figure 8 There can be 3 branch circuits 103 in , and the number of branch circuits 103 corresponds one-to-one with the number of loops 102. Accordingly, there can also be 3 loops 102. Of course, the number of branch circuits 103 is not limited to the embodiments listed herein and can also be other numbers, which will not be elaborated.

[0086] When there are too many branch circuits 103, an I / O expansion circuit and a shift register can be set in the control circuit 23 to achieve the connection of more branch circuits 103.

[0087] In Figure 8 , the second switch 222 in the branch circuit 103 to be detected can be selected through the control circuit 23, and then, in cooperation with the first switch 221, the fault detection of the in-vehicle speaker 121 connected to the branch circuit 103 to be detected can be carried out.

[0088] It can be understood that the present application can perform internal resistance fault detection to ensure that the internal resistance of the in-vehicle speaker 121 meets the design requirements of the vehicle for the speaker internal resistance.

[0089] The basic concepts have been described above. Obviously, for those skilled in the art, the above detailed disclosure is only an example and does not constitute a limitation to the present application. Although not explicitly stated here, those skilled in the art may make various modifications, improvements, and corrections to the present application. Such modifications, improvements, and corrections are proposed in the present application, so such modifications, improvements, and corrections still fall within the spirit and scope of the exemplary embodiments of the present application.

[0090] Meanwhile, the present application uses specific terms to describe the embodiments of the present application. Such as "one embodiment", "an embodiment", and / or "some embodiments" mean a certain feature, structure, or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that the "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more at different positions in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the present application can be appropriately combined.

[0091] In addition, unless clearly stated in the claims, the order of elements and sequences, the use of numbers and letters, or the use of other names in this application are not used to limit the order of the processes and methods of this application. Although some currently useful embodiments of the invention are discussed through various examples in the above disclosure, it should be understood that such details are only for illustrative purposes, and the appended claims are not limited to the disclosed embodiments. On the contrary, the claims are intended to cover all modifications and equivalent combinations that conform to the essence and scope of the embodiments of this application. For example, although the system components described above can be implemented by hardware devices, they can also be implemented only through software solutions, such as installing the described system on existing servers or mobile devices.

[0092] Similarly, it should be noted that, in order to simplify the presentation of the disclosure of this application and thus help the understanding of one or more embodiments of the invention, in the previous description of the embodiments of this application, sometimes multiple features are merged into one embodiment, drawing, or description thereof. However, this method of disclosure does not mean that the features required by the subject matter of this application are more than those mentioned in the claims. In fact, the features of the embodiments are less than all the features of the individual embodiments disclosed above.

[0093] In some embodiments, numbers describing the composition and quantity of attributes are used. It should be understood that such numbers used for the description of the embodiments are modified by the modifiers "about", "approximate", or "substantially" in some examples. Unless otherwise stated, "about", "approximate", or "substantially" indicate that the number allows a variation of ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, and these approximate values can change according to the characteristics required by individual embodiments. In some embodiments, the numerical parameters should consider the specified significant digits and adopt the method of retaining general digits. Although the numerical ranges and parameters used in some embodiments of this application to confirm the breadth of their scope are approximate values, in specific embodiments, the setting of such numerical values is as precise as possible within the feasible range.

[0094] For each patent, patent application, patent application publication, and other materials cited in this application, such as articles, books, specifications, publications, documents, etc., their entire contents are hereby incorporated into this application by reference. Except for application history documents that are inconsistent with or conflict with the content of this application, and documents that limit the broadest scope of the claims of this application (currently or subsequently appended to this application). It should be noted that if there are inconsistencies or conflicts between the descriptions, definitions, and / or uses of terms in the attached materials of this application and the content of this application, the descriptions, definitions, and / or uses of terms in this application shall prevail.

[0095] Finally, it should be understood that the embodiments in this application are only used to illustrate the principles of the embodiments of this application. Other variations may also fall within the scope of this application. Therefore, by way of example and not limitation, alternative configurations of the embodiments of this application may be regarded as consistent with the teachings of this application. Accordingly, the embodiments of this application are not limited to the embodiments explicitly presented and described in this application.

Claims

1. A vehicle-mounted detection circuit for detecting vehicle-mounted speakers, characterized in that, Comprising: A power supply circuit; An interface terminal for connecting an in-vehicle audio power amplifier and the in-vehicle speaker. When the in-vehicle audio power amplifier and the in-vehicle speaker are connected to the interface terminal, the in-vehicle audio power amplifier is connected to the in-vehicle speaker, and the in-vehicle audio power amplifier is used to drive the in-vehicle speaker to emit sound through the interface terminal; A protection circuit. When the in-vehicle speaker is connected to the interface terminal, the power supply circuit, the protection circuit, and the in-vehicle speaker form a loop through the interface terminal. The protection circuit is used to protect the loop when the in-vehicle speaker is short-circuited; And A control circuit, connected to the loop, for controlling the on / off of the loop and collecting the voltage value and / or current value in the loop for detecting the in-vehicle speaker.

2. The vehicle-mounted detection circuit according to claim 1, wherein The control circuit is used to detect the internal resistance, short-circuit state, or open-circuit state of the in-vehicle speaker based on the voltage value and / or current value.

3. The vehicle-mounted detection circuit according to claim 1, wherein When the in-vehicle audio power amplifier is in an unoperated state, the control circuit is used to collect the voltage value and / or current value for detecting the in-vehicle speaker.

4. The vehicle-mounted detection circuit according to claim 1, wherein The protection circuit includes: A first switch and a second switch, respectively connected to the control circuit. The control circuit is used to control the on / off of the first switch and the on / off of the second switch; and A load circuit. When the in-vehicle speaker is connected to the interface terminal, the power supply circuit, the load circuit, the in-vehicle speaker, the first switch, and the second switch form a loop through the interface terminal.

5. The vehicle-mounted detection circuit according to claim 4, wherein, The second switch, the interface terminal, and the load circuit form a branch. The branch is connected to the in-vehicle speaker through the interface terminal, and the branch is one or more.

6. The vehicle-mounted detection circuit according to claim 4, wherein The power supply circuit includes a high-level terminal and a low-level terminal. The load circuit includes a first load circuit and a second load circuit. The first load circuit and the first switch are connected in series between the high-level terminal and the interface terminal. The second load circuit and the second switch are connected in series between the low-level terminal and the interface terminal. The control circuit is connected to a collection point located between the first load circuit and the interface terminal to collect the voltage value and / or current value in the loop for detecting the in-vehicle speaker.

7. The in-vehicle detection circuit according to claim 6, wherein The first load circuit includes a first voltage stabilizing diode; And / or, the second load circuit includes a second voltage stabilizing diode.

8. The vehicle-mounted detection circuit according to claim 6, characterized in that, The load circuit further includes a third load circuit, and the third load circuit is connected in series between the collection point and the interface terminal.

9. The in-vehicle detection circuit according to claim 4, wherein The first switch is a current-limiting switch; And / or, the second switch is a field effect transistor.

10. The vehicle-mounted detection circuit according to claim 1, wherein The control circuit has a collection end for collecting the voltage value and / or current value in the loop for detecting the in-vehicle speaker. There is a collection point in the loop. The in-vehicle detection circuit further includes a resistor connected in series between the collection end and the collection point, and a capacitor connected in series between the collection end and the ground terminal.

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