CN109391874B - Vehicle-mounted loudspeaker working state detection circuit and method - Google Patents
Vehicle-mounted loudspeaker working state detection circuit and method Download PDFInfo
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- CN109391874B CN109391874B CN201710685173.5A CN201710685173A CN109391874B CN 109391874 B CN109391874 B CN 109391874B CN 201710685173 A CN201710685173 A CN 201710685173A CN 109391874 B CN109391874 B CN 109391874B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2420/00—Details of connection covered by H04R, not provided for in its groups
- H04R2420/05—Detection of connection of loudspeakers or headphones to amplifiers
Abstract
The invention discloses a vehicle-mounted loudspeaker working state detection circuit and a vehicle-mounted loudspeaker working state detection method, wherein according to impedance characteristics of a vehicle-mounted loudspeaker, when an OTL power amplifier outputs a connected loudspeaker, direct current impedance at two ends of LABA + and LABA- (default grounding) is about 4 ohm or 8 ohm; when the loudspeaker is short-circuited, the direct current impedance at the two ends of the LABA + and the LABA-is 0; when the output of the OTL power amplifier is not connected with a loudspeaker, the state is equivalent to an open circuit and a suspension state; and judging whether the vehicle-mounted loudspeaker is in an open circuit or short circuit state or not according to the jump of the level of the second input terminal GPIO0 of the MCU processor and different voltage values acquired by the A/D of the first input terminal based on the direct current impedance change at the two ends of the LABA + and the LABA-. The detection circuit and the detection method can be applied to equipment of a vehicle-mounted OTL audio amplifier and offline detection of grounding of one end of a loudspeaker in a vehicle, and are used for troubleshooting horn faults on the vehicle; the method has the advantages of low cost, convenient application, automatic detection of the vehicle-mounted sound player, rapid judgment of loudspeaker faults and the like.
Description
Technical Field
The invention relates to the technical field of loudspeaker fault detection, in particular to a circuit and a method for detecting the working state of a vehicle-mounted loudspeaker.
Background
OTL audio power amplifiers are often used in vehicle-mounted audio playing products, and the connection mode of the OTL audio power amplifiers and the equipped loudspeakers is different from that of OCL and BTL power amplifiers; firstly, an isolation value capacitor is arranged at the signal output end of the OTL power amplifier; and the anode of the loudspeaker is connected with the signal output end of the power amplifier, and the cathode of the loudspeaker is grounded. In practice, the output of the OTL audio power amplifier is often equipped with a combination of two or more vehicle speakers. A loudspeaker is a transducer device that converts an electrical signal into an acoustic signal. In the operation of the car audio system, the impedance of the speaker or the combined speaker is generally 4 ohms or 8 ohms, depending on the impedance characteristics. In the production process of the automobile, the loudspeaker and the related wire harness are pre-embedded and installed at a certain position of the automobile in advance, whether the wire harness is open-circuited or short-circuited is judged for complex wiring, unlike the loudspeaker connected with an OCL or BTL power amplifier (the loudspeaker is in a bridge connection method, one end of the loudspeaker is not grounded), the loudspeaker can be scanned and detected by adopting a waveform with fixed frequency, and the existing impedance of the loudspeaker is judged and calculated by coding and decoding or level jump; and to speaker one end ground connection, generally can only artificial use universal meter carry out detection all the way, when there are a plurality of speakers in OTL audio power amplifier output, get rid of loudspeaker open circuit, short circuit through artifical the detection and cause to waste time and energy. In view of this problem, there is a need for a speaker open/short detection circuit and method for detecting whether a speaker mounted on an automobile is abnormal.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a circuit and a method for detecting the working state of a vehicle-mounted loudspeaker, which are used for detecting the working state of the vehicle-mounted loudspeaker according to the impedance characteristic of the vehicle-mounted loudspeaker; judging whether the vehicle-mounted loudspeaker is in an open circuit state or a short circuit state by adopting an MCU processor electronic I/O detection technology and an A/D acquisition mode; the circuit and the test method can be applied to equipment of a vehicle-mounted OTL audio amplifier and offline detection of grounding of one end of a loudspeaker in a vehicle, and are used for troubleshooting horn faults on the vehicle; the method has the advantages of low cost, convenient application, automatic detection of the vehicle-mounted sound player, rapid judgment of loudspeaker faults and the like.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the utility model provides a vehicle loudspeaker operating condition detection circuitry, includes the speaker, the speaker positive terminal is used for connecting the LABA + end that links to each other with signal output OUT of OTL audio power amplifier U3, and its negative pole end LABA-ground connection still includes: a single-pole three-throw analog switch U1, a triode Q1, an MCU processor U2 and a third filter capacitor C3; the MCU processor U2 controls the switch of the static contact terminal of the single-pole three-throw analog switch U1 through a first output terminal GPIO1 connected with the second control terminal S2 of the single-pole three-throw analog switch U1 and a second output terminal GPIO2 connected with the first control terminal S1 of the single-pole three-throw analog switch U1; the moving contact end A of the single-pole three-throw analog switch U1 is connected with the LABA + end, the first fixed contact end B0 of the single-pole three-throw analog switch U1 is grounded through the third filter capacitor C3, and the second fixed contact end B1 of the single-pole three-throw analog switch U3578 is connected with the base electrode of the triode Q1 and is used for controlling the conduction or the cut-off of the triode Q1 under the working state of a loudspeaker; the MCU processor U2 judges the working state of the loudspeaker according to the level value of a second input terminal GPIO0 connected with the collector of the triode Q1 and the voltage value of a first input terminal A/D connected with a third stationary contact B2 of the single-pole three-throw analog switch U1.
Preferably, the detection circuit further includes: the filter circuit comprises a first current-limiting resistor R1, a second current-limiting resistor R2, a third current-limiting resistor R3, a first filter capacitor C1 and a second filter capacitor C2; the first current-limiting resistor R1 and the third current-limiting resistor R3 are connected in series between the second fixed contact terminal B1 of the single-pole three-throw analog switch U1 and the base electrode of the triode Q1; the serial connection point of the first current limiting resistor R1 and the third current limiting resistor R3 is connected to a first pull-up voltage VCC (I/O) through a second current limiting resistor R2; the serial connection point of the first current limiting resistor R1 and the third current limiting resistor R3 is grounded through a first filter capacitor C1; the serial connection point of the third current limiting resistor R3 and the base electrode of the triode Q1 is grounded through the second filter capacitor C2; the emitter of the transistor Q1 is grounded.
Preferably, the detection circuit further includes: a fourth pull-up resistor R4; the fourth pull-up resistor R4 is connected between the first pull-up voltage VCC (I/O) and the second input terminal GPIO0 of the MCU processor U2.
Preferably, the detection circuit further includes: a sixth pull-up resistor R6; the sixth pull-up resistor R6 is connected between the second pull-up voltage VCC (AD) and the first input end A/D of the MCU processor U2.
Preferably, the detection circuit further includes: a fifth filter resistor R5; the fifth filter resistor R5 is connected between the LABA + end and the movable contact end A of the single-pole three-throw analog switch U1.
Preferably, the single-pole-three-throw analog switch U1 is a low on-resistance single-pole-three-throw analog switch.
Preferably, a fourth blocking capacitor C4 is connected between the signal output end OUT of the OTL audio power amplifier and the LABA + end.
A vehicle-mounted loudspeaker working state detection method is based on a vehicle-mounted loudspeaker working state detection circuit and comprises the following steps:
when the circuit is powered on, the MCU processor U2 controls the first output terminal GPIO1 and the second output terminal GPIO2 to switch the movable contact terminal A of the single-pole three-throw analog switch U1 to the first stationary contact terminal B0;
starting detection, the MCU processor U2 controls the first output terminal GPIO1 and the second output terminal GPIO2 to switch the movable contact terminal A of the single-pole three-throw analog switch U1 to the second stationary contact terminal B1; the MCU processor U2 judges whether the level value of the GPIO0 at the second input end is high level or low level, if the level value is low level, the positive end of the loudspeaker is not connected with the LABA + end, the loudspeaker is judged to be in an open circuit state, and the detection is quit;
if the level value of the second input terminal GPIO0 is high, indicating that the positive terminal of the speaker has an access LABA + terminal or a speaker short circuit, the MCU processor U2 controls the first output terminal GPIO1 and the second output terminal GPIO2 to switch the moving contact terminal a of the single-pole three-throw analog switch U1 to the third stationary contact terminal B2; the MCU processor U2 reads the voltage value of the first input end A/D, inquires a pre-stored key value corresponding to the voltage value, and judges whether the loudspeaker is in a short circuit or normal connection state according to the pre-stored key value.
Preferably, the MCU processor U2 switches the moving contact terminal a of the single-pole three-throw analog switch U1 to the first stationary contact terminal B0 when the first output terminal GPIO1 is controlled to be at a high level and the second output terminal GPIO2 is controlled to be at a low level; the MCU processor U2 controls the first output terminal GPIO1 to be low level and the second output terminal GPIO2 to be high level, and switches the movable contact terminal A of the single-pole three-throw analog switch U1 to the second stationary contact terminal B1; the MCU processor U2 controls the first output terminal GPIO1 to be high and the second output terminal GPIO2 to be high, and switches the moving contact terminal a of the single-pole-three-throw analog switch U1 to the third stationary contact terminal B2.
Preferably, when a pre-stored key value corresponding to the voltage value of the first input end a/D is 1, it is determined that the speaker is in a short-circuit state; and when the pre-stored key value corresponding to the voltage value of the first input end A/D is 2, judging that the loudspeaker is in a normal connection state.
The technical scheme provided by the invention has the beneficial effects that:
1. the invention utilizes the impedance characteristic of the loudspeaker and automatically detects the open circuit, short circuit or normal working state of the loudspeaker of the OTL power amplifier through the impedance change;
2. according to the invention, through the I/O port high-low level detection control and AD acquisition technology of the MCU processor, the circuit is simple and the cost is low;
3. when the circuit is in a default state, the loudspeaker is disconnected with the detection circuit and is connected to a fifth resistor R5, Ron (the on-resistance of a single-pole-three-throw analog switch U1) and a third filter capacitor C3, and the R5, the Ron and the C3 form a loudspeaker filter circuit, so that high-frequency self-excitation can be eliminated, the tone quality can be improved, and the normal work of a power amplifier cannot be influenced; in the detection process, the MCU processor is not required to generate fixed frequency to scan and detect the loudspeaker, and unnecessary noise is not generated on the loudspeaker;
4. the method realizes automatic detection, and can quickly locate the fault position of the vehicle-mounted loudspeaker without manual participation.
The present invention will be described in further detail with reference to the drawings and the embodiments, but the circuit and the method for detecting the operating condition of the vehicle-mounted speaker according to the present invention are not limited to the embodiments.
Drawings
FIG. 1 is a circuit diagram of an embodiment of the present invention;
FIG. 2 is a flow chart of the detection according to the embodiment of the present invention.
Detailed Description
Referring to fig. 1, an embodiment of the present invention provides a circuit for detecting an operating state of a vehicle speaker, including a speaker, where a positive terminal of the speaker is used to connect to an LABA + terminal connected to a signal output terminal OUT of an OTL audio power amplifier U3, and a negative terminal thereof is connected to ground, and further including: a single-pole three-throw analog switch U1, an NPN triode Q1, an MCU processor U2 and a third filter capacitor C3; the MCU processor U2 controls the switch of the static contact terminal of the single-pole three-throw analog switch U1 through a first output terminal GPIO1 connected with the second control terminal S2 of the single-pole three-throw analog switch U1 and a second output terminal GPIO2 connected with the first control terminal S1 of the single-pole three-throw analog switch U1; the moving contact end A of the single-pole three-throw analog switch U1 is connected with the LABA + end, the first fixed contact end B0 of the single-pole three-throw analog switch U1 is grounded through the third filter capacitor C3, and the second fixed contact end B1 of the single-pole three-throw analog switch U3578 is connected with the base electrode of the triode Q1 and is used for controlling the conduction or the cut-off of the triode Q1 under the working state of a loudspeaker; the MCU processor U2 judges the working state of the loudspeaker according to the level value of a second input terminal GPIO0 connected with the collector of the triode Q1 and the voltage value of a first input terminal A/D connected with a third stationary contact B2 of the single-pole three-throw analog switch U1.
The detection circuit further includes: the filter circuit comprises a first current-limiting resistor R1, a second current-limiting resistor R2, a third current-limiting resistor R3, a first filter capacitor C1 and a second filter capacitor C2; the first current-limiting resistor R1 and the third current-limiting resistor R3 are connected in series between the second fixed contact terminal B1 of the single-pole three-throw analog switch U1 and the base electrode of the triode Q1; the serial connection point of the first current limiting resistor R1 and the third current limiting resistor R3 is connected to a first pull-up voltage VCC (I/O) through a second current limiting resistor R2; the serial connection point of the first current limiting resistor R1 and the third current limiting resistor R3 is grounded through a first filter capacitor C1; the serial connection point of the third current limiting resistor R3 and the base electrode of the triode Q1 is grounded through the second filter capacitor C2; the emitter of the transistor Q1 is grounded. The transistor Q1 is switched by adjusting the first current limiting resistor R1, the second current limiting resistor R2 and the third current limiting resistor R3. The filter circuit consisting of the first current-limiting resistor R1, the first filter capacitor C1, the third current-limiting resistor R3 and the first filter capacitor C1 can filter out alternating current components of audio frequency, and only a direct current level is guaranteed to pass through the triode Q1.
The detection circuit further includes: a fourth pull-up resistor R4; the fourth pull-up resistor R4 is connected between the first pull-up voltage VCC (I/O) and the second input terminal GPIO0 of the MCU processor U2.
The detection circuit further includes: a sixth pull-up resistor R6; the sixth pull-up resistor R6 is connected between the second pull-up voltage VCC (AD) and the first input end A/D of the MCU processor U2. The sixth pull-up resistor R6 is a small-resistance high-power resistor. The voltage vcc (ad) is required to be a low voltage.
The detection circuit further includes: a fifth filter resistor R5; the fifth filter resistor R5 is connected between the LABA + end and the movable contact end A of the single-pole three-throw analog switch U1.
The single-pole three-throw analog switch U1 is a low on-resistance single-pole three-throw analog switch, and its on-resistance is Ron. The fifth filter resistor R5 is a high-power small resistor, the third filter capacitor C3 is a small capacitor, and the fifth filter resistor R5, the on-resistance Ron of the single-pole-three-throw analog switch U1 and the third filter capacitor C3 form a speaker filter, so that high-frequency self-excitation is eliminated, and the sound quality is improved.
Further, a fourth blocking capacitor C4 is connected between the signal output end OUT of the OTL audio power amplifier and the LABA + end.
The detection principle of the working state detection circuit of the vehicle-mounted loudspeaker in the embodiment of the invention is as follows: according to the impedance characteristic of the vehicle-mounted loudspeaker, when the OTL power amplifier outputs an output connected loudspeaker, the direct current impedance at two ends of LABA + and LABA- (default grounding) is about 4 ohm or 8 ohm; when the loudspeaker is short-circuited, the direct current impedance at the two ends of the LABA + and the LABA-is 0; when the output of the OTL power amplifier is not connected with a loudspeaker, the state is equivalent to an open circuit and a suspension state; and judging whether the vehicle-mounted loudspeaker is in an open-circuit state or a short-circuit state according to the jump of the level of an I/O port (a second input end GPIO0) of the MCU processor and different voltage values acquired by an A/D port (a first input end A/D) based on the direct current impedance change at two ends of the LABA + and the LABA-.
A vehicle-mounted loudspeaker working state detection method is based on a vehicle-mounted loudspeaker working state detection circuit and comprises the following steps:
when the circuit is powered on, the MCU processor U2 controls the first output terminal GPIO1 and the second output terminal GPIO2 to switch the movable contact terminal A of the single-pole three-throw analog switch U1 to the first stationary contact terminal B0;
starting detection, the MCU processor U2 controls the first output terminal GPIO1 and the second output terminal GPIO2 to switch the movable contact terminal A of the single-pole three-throw analog switch U1 to the second stationary contact terminal B1; the MCU processor U2 judges whether the level value of the GPIO0 at the second input end is high level or low level, if the level value is low level, the positive end of the loudspeaker is not connected with the LABA + end, the loudspeaker is judged to be in an open circuit state, and the detection is quit;
if the level value of the second input terminal GPIO0 is high, indicating that the positive terminal of the speaker has an access LABA + terminal or a speaker short circuit, the MCU processor U2 controls the first output terminal GPIO1 and the second output terminal GPIO2 to switch the moving contact terminal a of the single-pole three-throw analog switch U1 to the third stationary contact terminal B2; the MCU processor U2 reads the voltage value of the first input end A/D, inquires a pre-stored key value corresponding to the voltage value, and judges whether the loudspeaker is in a short circuit or normal connection state according to the pre-stored key value.
Further, the MCU processor U2 controls the first output terminal GPIO1 to be high level and the second output terminal GPIO2 to be low level, and switches the moving contact terminal a of the single-pole-three-throw analog switch U1 to the first stationary contact terminal B0; the MCU processor U2 controls the first output terminal GPIO1 to be low level and the second output terminal GPIO2 to be high level, and switches the movable contact terminal A of the single-pole three-throw analog switch U1 to the second stationary contact terminal B1; the MCU processor U2 controls the first output terminal GPIO1 to be high and the second output terminal GPIO2 to be high, and switches the moving contact terminal a of the single-pole-three-throw analog switch U1 to the third stationary contact terminal B2.
Further, when a pre-stored key value corresponding to the voltage value of the first input end A/D is 1, judging that the loudspeaker is in a short-circuit state; and when the pre-stored key value corresponding to the voltage value of the first input end A/D is 2, judging that the loudspeaker is in a normal connection state.
The working process of the working state detection method of the vehicle-mounted loudspeaker in the embodiment of the invention is as follows:
when open circuit and short circuit detection is not performed, the state is a default state. The MCU processor U2 opens the switches A and B0 of the single-pole three-throw analog switch U1 by controlling the high-low states of the first output end GPIO1 and the second output end GPIO2, so that LABA +, R5 and C3 are communicated, and the R5, Ron and C3 form a loudspeaker filter circuit, thereby eliminating high-frequency self-excitation, improving the tone quality and not influencing the normal work of the power amplifier.
The MCU starts to test the speaker. The MCU processor U2 opens the switches A and B1 of the single-pole three-throw analog switch U1 by controlling the high-low states of the first output terminal GPIO1 and the second output terminal GPIO2, so that LABA + and R5 are connected to circuits such as R1, C1, R3, C2, Q1 and the like, and R1, C1, R3 and C2 form a filter circuit to filter all audio alternating current components from the loudspeaker; if the LABA + is not connected with the loudspeaker and is in an open circuit state, the triode Q1 is conducted, and the GPIO0 at the second input end of the MCU processor U2 detects a low level to indicate that the loudspeaker is open circuit; if the LABA + is connected with the loudspeaker or is short-circuited, the transistor Q1 is not conducted, and the GPIO0 of the MCU processor U2 detects a high level to indicate that the loudspeaker is normally connected or short-circuited.
When the GPIO0 of the MCU processor U2 detects a high level and the speaker is in normal connection or short circuit, the MCU processor U2 opens the switches A and B2 of the single-pole three-throw analog switch U1 by controlling the high-low state of the first output terminal GPIO1 and the second output terminal GPIO2, the switches A and B2 are directly communicated with the A/D acquisition port of the MCU processor U2, and the I/O port of the MCU processor U2 is in a high-impedance state. When the loudspeaker is short-circuited, the voltage value Vi detected by the A/D acquisition port of the MCU processor U2 is [ VCC (AD)/(R6+ Ron + R5) ] (Ron + R5); when the loudspeaker is normally connected, the voltage value of Vi is [ VCC (AD)/(R6+ Ron + R5+ RL) ] (Ron + R5+ RL); the MCU processor U2 identifies whether the loudspeaker is in a short circuit state or a normal connection state currently by collecting the voltage value Vi of the A/D end and inquiring key values prestored in a memory.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides a vehicle loudspeaker operating condition detection circuitry, includes the speaker, the speaker positive terminal is used for connecting the LABA + end that links to each other with OTL audio power amplifier's signal output part, and its negative pole holds LABA-ground connection, its characterized in that still includes: a single-pole three-throw analog switch, a triode, an MCU processor and a third filter capacitor; the MCU processor controls the switching of the static contact end of the single-pole three-throw analog switch through a first output end connected with the second control end of the single-pole three-throw analog switch and a second output end connected with the first control end of the single-pole three-throw analog switch; the moving contact end A of the single-pole three-throw analog switch is connected with the LABA + end, the first fixed contact end of the single-pole three-throw analog switch is grounded through the third filter capacitor, and the second fixed contact end of the single-pole three-throw analog switch is connected with the base electrode of the triode and is used for controlling the conduction or the cut-off of the triode according to the working state of a loudspeaker; and the MCU processor judges the working state of the loudspeaker according to the level value of a second input end connected with the collector of the triode and the voltage value of a first input end connected with a third stationary contact of the single-pole three-throw analog switch.
2. The on-vehicle speaker operating condition detecting circuit according to claim 1, wherein the detecting circuit further includes: the filter comprises a first current limiting resistor, a second current limiting resistor, a third current limiting resistor, a first filter capacitor and a second filter capacitor; the first current-limiting resistor and the third current-limiting resistor are connected in series between the second stationary contact end of the single-pole three-throw analog switch and the base electrode of the triode; the serial connection point of the first current limiting resistor and the third current limiting resistor is connected to a first pull-up voltage through a second current limiting resistor; the series connection point of the first current limiting resistor and the third current limiting resistor is grounded through a first filter capacitor; the serial connection point of the third current limiting resistor and the base electrode of the triode is grounded through the second filter capacitor; and the emitter of the triode is grounded.
3. The on-vehicle speaker operating condition detecting circuit according to claim 1, wherein the detecting circuit further includes: a fourth pull-up resistor; and the fourth pull-up resistor is connected between the first pull-up voltage and the second input end of the MCU processor.
4. The on-vehicle speaker operating condition detecting circuit according to claim 1, wherein the detecting circuit further includes: a sixth pull-up resistor; and the sixth pull-up resistor is connected between the second pull-up voltage and the first input end of the MCU processor.
5. The on-vehicle speaker operating condition detecting circuit according to claim 1, wherein the detecting circuit further includes: a fifth filter resistor; and the fifth filter resistor is connected between the LABA + end and the movable contact end of the single-pole three-throw analog switch.
6. The on-vehicle speaker operating condition detecting circuit according to claim 1, wherein the single-pole-three-throw analog switch is a low on-resistance single-pole-three-throw analog switch.
7. The on-vehicle speaker operating condition detecting circuit of claim 1, wherein a fourth dc blocking capacitor is connected between the signal output terminal of the OTL audio power amplifier and the LABA + terminal.
8. A method for detecting the working state of a vehicle-mounted loudspeaker, which is based on the working state detection circuit of the vehicle-mounted loudspeaker as claimed in any one of claims 1 to 7, and comprises the following steps:
when the circuit is electrified, the MCU processor controls the first output end and the second output end to switch the movable contact end of the single-pole three-throw analog switch to the first fixed contact end;
starting detection, wherein the MCU processor controls the first output end and the second output end to switch the movable contact end of the single-pole three-throw analog switch to the second stationary contact end; the MCU processor judges whether the level value of the second input end is high level or low level, if the level value is low level, the positive end of the loudspeaker is not connected with the LABA + end, the loudspeaker is judged to be in an open circuit state, and the detection is quit;
if the level value of the second input end is high level, the positive end of the loudspeaker is connected with an LABA + end or the loudspeaker is short-circuited, and the MCU processor controls the first output end and the second output end to switch the movable contact end of the single-pole three-throw analog switch to a third fixed contact end; the MCU processor reads the voltage value of the first input end, inquires a pre-stored key value corresponding to the voltage value, and judges whether the loudspeaker is in a short circuit or normal connection state according to the pre-stored key value.
9. The method for detecting the working state of the vehicle-mounted loudspeaker according to claim 8, wherein the MCU processor controls the first output end to be at a high level and the second output end to be at a low level so as to switch the movable contact end of the single-pole three-throw analog switch to the first fixed contact end; the MCU processor controls the first output end to be at a low level and the second output end to be at a high level, and switches the movable contact end of the single-pole three-throw analog switch to the second stationary contact end; and the MCU processor controls the movable contact end A of the single-pole three-throw analog switch to be switched to the third stationary contact end when the first output end is in a high level and the second output end is in a high level.
10. The method for detecting the working state of the vehicle-mounted loudspeaker according to claim 8, wherein when a pre-stored key value corresponding to the voltage value of the first input end is 1, the loudspeaker is judged to be in a short-circuit state; and when the pre-stored key value corresponding to the voltage value of the first input end is 2, judging that the loudspeaker is in a normal connection state.
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| CN201710685173.5A CN109391874B (en) | 2017-08-11 | 2017-08-11 | Vehicle-mounted loudspeaker working state detection circuit and method |
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| CN201710685173.5A CN109391874B (en) | 2017-08-11 | 2017-08-11 | Vehicle-mounted loudspeaker working state detection circuit and method |
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| CN109951788B (en) * | 2019-04-04 | 2021-06-15 | 远峰科技股份有限公司 | Loudspeaker detection circuit, loudspeaker detection system and detection method |
| CN110262921A (en) * | 2019-07-15 | 2019-09-20 | 广州小鹏汽车科技有限公司 | A kind of method for diagnosing faults, system and the device of the vehicle-mounted loudspeaker of vehicle |
| CN111629314B (en) * | 2020-04-28 | 2021-11-09 | 惠州市德赛西威汽车电子股份有限公司 | Overvoltage detection reminding system and method for vehicle-mounted loudspeaker |
| CN112327211B (en) * | 2020-09-29 | 2023-07-21 | 惠州市德赛西威汽车电子股份有限公司 | Vehicle-mounted microphone power supply connection state monitoring circuit and method |
| CN112770244B (en) * | 2020-12-22 | 2021-07-30 | 北京城建智控科技有限公司 | Method and device for detecting line fault of loudspeaker and audio playing equipment |
| CN113242502B (en) * | 2021-03-22 | 2022-07-26 | 苏州上声电子股份有限公司 | Vehicle-mounted sound system and loudspeaker open circuit detection method thereof |
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