CN214070164U - Loudspeaker open circuit detection circuit - Google Patents
Loudspeaker open circuit detection circuit Download PDFInfo
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- CN214070164U CN214070164U CN202022273485.5U CN202022273485U CN214070164U CN 214070164 U CN214070164 U CN 214070164U CN 202022273485 U CN202022273485 U CN 202022273485U CN 214070164 U CN214070164 U CN 214070164U
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Abstract
The utility model relates to an open circuit detection technical field provides a speaker open circuit detection circuitry, add half-bridge drive circuit at the both ends of speaker, under the prerequisite of major loop power disconnection (namely after the drive power supply of major control module disconnection digital analog conversion module, power amplification module), order the major control module control sampling detection circuitry to supply power to the speaker, set up sampling resistor at half-bridge drive circuit's base end, utilize the voltage value on the detection circuitry collection sampling resistor to obtain sampling voltage, and judge whether the speaker opens circuit according to the open circuit judgement logic of predetermineeing; and then will send the on-vehicle diagnostic instrument according to the detection result that opens a way through CAN BUS module, inform the car owner or 4S shop change the speaker of trouble, further promote the quality of service of on-vehicle speaker.
Description
Technical Field
The utility model relates to an open circuit detects technical field, especially relates to a speaker open circuit detection circuitry.
Background
The vehicle-mounted liquid crystal instrument alarm sound is basically emitted by a vehicle-mounted loudspeaker, but because the loudspeaker needs to realize the audio output of the whole vehicle, the environment of the whole vehicle is complex, and the alarm sound can not be accurately emitted after being cut off. Meanwhile, because of no targeted diagnosis circuit, a user cannot confirm that the fatigue disconnection fault of the loudspeaker is caused when the alarm sound is cut off; or because the bus does not receive the alarm message; or damage to the operational amplifier output driving the speaker; or I2S decoding chip damage. Therefore, the failure of the loudspeaker cannot be located at all, and the disassembling analysis is required, but the checking means of the disassembling analysis is not favorable for the after-sales analysis and the service. The open-circuit diagnosis in the current market is integrated in an operational amplifier IC, and the circuit structure has high cost and is not beneficial to popularization and application of projects. In summary, the conventional speaker fault detection method has the following difficulties:
1. the operation decoding chip with open circuit detection is expensive, so that the equipment cost is too high and the market popularization is not facilitated;
2. faults cannot be accurately located, such as speaker open or operational amplifier open, or decoding chip or other faults.
Disclosure of Invention
The utility model provides a speaker detection circuitry that opens a way has solved prior art and can't carry out the technical problem that the accuracy detected to the speaker trouble of opening a way.
For solving the above technical problem, the utility model provides a loudspeaker open circuit detection circuitry, include: the main control module and a sampling detection circuit connected with the main control module; the sampling detection circuit is connected to two ends of the loudspeaker and comprises a half-bridge drive circuit and a detection circuit which are mutually connected; the signal output end of the main control module comprises a first signal output end, a second signal output end and a signal output end;
the main control module is used for outputting a driving instruction to the sampling detection circuit through the first signal output end and the second signal output end;
the half-bridge driving circuit is used for responding to the driving instruction and providing driving current for the loudspeaker in a non-driving state;
the detection circuit is used for collecting circuit voltage on the driving circuit to obtain the sampling voltage;
the main control module is further used for obtaining an open circuit detection result according to the sampling voltage fed back from the signal output end.
The basic scheme is provided with the sampling detection circuit comprising the half-bridge drive circuit and the detection circuit, so that the loudspeaker can be directly driven when the fault of the loudspeaker is detected; in the driving process, the main control module can acquire corresponding sampling voltage from the signal output end and obtain a corresponding open circuit detection result, whether the loudspeaker is open circuit or not can be accurately judged, accurate positioning of faults is achieved, and maintenance efficiency of equipment is improved.
In a further embodiment, the half-bridge driving circuit includes a first resistor, a second resistor, a third resistor, a first switch tube and a second switch tube;
the first resistor is connected with a first signal output end, and the other end of the first resistor is connected to one end of the loudspeaker through a first switch tube; one end of the second resistor is connected with the second signal output end, and the other end of the second resistor is connected to the other end of the loudspeaker through the second switch tube and the third resistor;
the third resistor is a sampling resistor.
In a further embodiment, the detection circuit comprises a fourth resistor and a first capacitor; one end of the fourth resistor is connected with the other end of the loudspeaker, and the other end of the fourth resistor is grounded through the first capacitor and connected to the signal output end.
According to the scheme, a half-bridge driving circuit and a detection circuit which are mutually connected are arranged to form a sampling detection circuit, and a driving current is provided for a loudspeaker in a non-driving state by utilizing the switching function and the signal amplification function of a triode in the half-bridge driving circuit, so that the loudspeaker enters a detection working state;
the detection circuit is provided with a sampling resistor connected with the loudspeaker in series, the sampling resistor is subjected to voltage acquisition to obtain sampling voltage, when the loudspeaker is opened, the internal resistance of the loudspeaker tends to infinity, and then the loop current tends to infinitesimal, so the sampling voltage divided by the sampling resistor also tends to infinitesimal (namely low level), and when the loudspeaker is not opened, the sampling voltage can be calculated according to the resistance ratio of the sampling resistor and the internal resistance of the loudspeaker, so whether the loudspeaker is opened or not can be judged according to the voltage value of the sampling voltage.
Still set up fourth resistance and first electric capacity and carry out voltage filtering, can avoid signal interference, further improve the rate of accuracy of gathering the signal, improve the rate of accuracy that the speaker open circuit detected promptly.
In a further embodiment, the first switch tube is a PNP triode or a PNP MOS tube; the second switch tube is an NPN type triode or an NPN type MOS tube.
The resistance values of the first resistor and the second resistor are equal; the resistance value of the third resistor is far larger than the internal resistance of the loudspeaker;
when the loudspeaker is open-circuited, the resistance value of the loudspeaker approaches infinity, so the sampling voltage divided by the third resistor is a low level;
when the loudspeaker works normally, the resistance value of the third resistor is far larger than the internal resistance of the loudspeaker, so that the sampling voltage divided by the third resistor is high level.
According to the scheme, the first resistor and the second resistor with equal resistance values are arranged on the base electrodes of the first switch tube and the second switch tube and are used as the current-limiting resistors of the detection loop, so that the situation that the driving current of the base electrodes of the switch tubes is overlarge to damage the main control module can be effectively prevented; the third resistor with the resistance value far larger than the internal resistance of the loudspeaker is used as the sampling resistor, so that the voltage obtained by the sampling resistor during the normal work of the loudspeaker is enough (namely, high level) and is distinguished from the sampling voltage on the sampling resistor (namely, low level) when the circuit is equivalent to the open circuit during the fault of the loudspeaker; so that the main control module can directly judge whether the loudspeaker is open or not according to the sampling voltage.
The utility model also comprises a digital-to-analog conversion module and a power amplification module which are connected between the main control module and the loudspeaker in sequence; the storage module and the data connection module are connected with the main control module;
the digital-to-analog conversion module is used for converting the control instruction output by the main control module into an analog signal from a digital signal;
the power amplification module is used for amplifying the analog signal to preset power to drive the loudspeaker;
the storage module is used for presetting open circuit judgment logic and playing materials;
the data connection module is used for outputting a diagnosis command of a user to the main control module;
the main control module is used for acquiring an open circuit detection result according to the preset open circuit judgment logic and the sampling voltage.
In further embodiments, the data connection module is a CAN BUS module; the storage module is a Nor Flash storage; the main control module is an MCU.
In a further embodiment, the preset open-circuit judgment logic is: when the sampling voltage is at a low level, judging that the loudspeaker is open-circuited; and when the sampling voltage is at a high level, judging that the loudspeaker works normally.
According to the basic scheme, half-bridge driving circuits are additionally arranged at two ends of a loudspeaker, on the premise that a main loop power supply is disconnected (namely, after a main control module disconnects the driving power supply of a digital-to-analog conversion module and a power amplification module), the main control module is instructed to control a sampling detection circuit to supply power to the loudspeaker, a sampling resistor is arranged at the bottom edge end of the half-bridge driving circuit, the detection circuit is used for collecting the voltage value on the sampling resistor to obtain sampling voltage, and whether the loudspeaker is open-circuited or not is judged according to preset open-circuit judgment logic; and then will send the on-vehicle diagnostic instrument according to the detection result that opens a way through CAN BUS module, inform the car owner or 4S shop change the speaker of trouble, further promote the quality of service of on-vehicle speaker.
Drawings
Fig. 1 is a system frame diagram of a speaker open circuit detection circuit according to an embodiment of the present invention;
fig. 2 is a hardware circuit diagram of the sampling detection circuit of fig. 1 according to an embodiment of the present invention.
Wherein: the device comprises a main control module 1, a sampling detection circuit 2, a half-bridge drive circuit 21 and a detection circuit 22; the device comprises a digital-to-analog conversion module 3, a power amplification module 4, a storage module 5, a data connection module 6 and a loudspeaker 7;
and: the circuit comprises a first resistor R1-a fourth resistor R4, a first switch tube Q1, a second switch tube Q2 and a first capacitor C1; a first signal output Ctrol1, a second signal output Ctrol2, and a signal output IO-FB.
Detailed Description
The following embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are given for illustrative purposes only and are not to be construed as limiting the invention, including the drawings, which are only used for reference and illustration, and do not constitute a limitation to the scope of the invention, since many changes may be made thereto without departing from the spirit and scope of the invention.
The embodiment of the utility model provides a pair of speaker open circuit detection circuitry, as shown in fig. 1, fig. 2, in this embodiment, include: the device comprises a main control module 1 and a sampling detection circuit 2 connected with the main control module; the sampling detection circuit 2 is connected to two ends of the loudspeaker 7 and comprises a half-bridge drive circuit 21 and a detection circuit 22 which are connected with each other, and the main control module 1 comprises a first signal output end IO-FBCtrol1, a second signal output end IO-FBCtrol2 and a signal output end IO-FB;
the main control module 1 is used for outputting a driving instruction to the sampling detection circuit 2 through a first signal output end IO-FBCtrol1 and a second signal output end IO-FBCtrol 2;
the half-bridge driving circuit 21 is used for responding to the driving instruction and providing a driving current for the loudspeaker 7 in a non-driving state;
the detection circuit 22 is configured to collect a circuit voltage on the driving circuit to obtain the sampling voltage;
the main control module 1 is further configured to obtain an open circuit detection result according to the sampling voltage fed back from the signal output end IO-FB.
The embodiment of the utility model provides a set up the sampling detection circuit 2 including half-bridge drive circuit 21 and detection circuit 22 connected each other to can be when carrying out speaker 7 fault detection, directly drive speaker 7; in the driving process, the main control module 1 can acquire corresponding sampling voltage from the signal output end IO-FB and obtain a corresponding open circuit detection result, so that whether the loudspeaker 7 is open or not can be accurately judged, the accurate positioning of faults is realized, and the maintenance efficiency of equipment is improved.
In the present embodiment, the half-bridge driving circuit 21 includes a first resistor R1, a second resistor R2, a third resistor R3, a first switch Q1, and a second switch Q2;
the first resistor R1 is connected with the first signal output end IO-FBCtrol1, and the other end is connected with one end of the loudspeaker through a first switch tube Q1; one end of the second resistor R2 is connected to the second signal output terminal IO-FBCtrol2, and the other end is connected to the other end of the speaker through the second switch tube Q2 and the third resistor R3;
the third resistor R3 is a sampling resistor, and in this embodiment, the resistance value thereof is preferably 1K ohm, which can ensure that the driving current of the driving circuit of the speaker 7 is as small as possible, and the type selection of the first switch tube Q1 and the second switch tube Q2 is not affected, thereby further reducing the cost.
In the present embodiment, the detection circuit 22 includes a fourth resistor R4 and a first capacitor C1; one end of the fourth resistor R4 is connected to the other end of the speaker, and the other end is connected to ground and to the signal output terminal IO-FB through the first capacitor C1.
In the present embodiment, the first switch Q1 includes, but is not limited to, a PNP transistor, a PNP MOS transistor; the second switching transistor Q2 includes, but is not limited to, an NPN transistor, an NPN MOS transistor.
Preferably, the first switch tube Q1 is a PNP type triode with model BC807-40, the maximum driving current of the PNP type triode can reach 500mA, and at this time, the base of the first switch tube Q1 is connected to the main control module 1, the emitter is connected to the power supply, and the collector is connected to one end of the speaker 7; the second switch tube Q2 is an NPN type triode with model BC817-40, the maximum driving current of the triode can reach 500mA, at this time, the base of the second switch tube Q2 is connected to the main control module 1, the emitter is grounded, and the collector is connected to the third resistor R3.
The first resistor R1 and the second resistor R2 are equal in resistance; the resistance of the third resistor R3 is much larger than the internal resistance of the speaker 7.
In the present embodiment, the resistances of the first resistor R1 and the second resistor R2 are preferably 4.7K ohms, and the ratio of the resistance of the third resistor R3 to the resistance of the speaker 7 is at least 20 times;
when the speaker 7 is open, the resistance of the speaker 7 approaches infinity, and therefore the sampled voltage divided by the third resistor R3 will be low;
when the speaker 7 is working normally, the resistance of the third resistor R3 is much larger than the internal resistance of the speaker 7, so the sampled voltage divided by the third resistor R3 will be high.
In this embodiment:
a half-bridge driving circuit 21 and a detection circuit 22 which are mutually connected are arranged to form a sampling detection circuit 2, and a driving current is provided for a loudspeaker 7 in a non-driving state by utilizing the switching function and the signal amplification function of a triode in the half-bridge driving circuit 21, so that the loudspeaker 7 enters a detection working state;
the detection circuit 22 is provided with a sampling resistor connected in series with the speaker 7, the sampling resistor is subjected to voltage acquisition to obtain sampling voltage, when the speaker 7 is open-circuited, the internal resistance tends to infinity, the loop current tends to infinitesimal, and therefore the sampling voltage divided by the sampling resistor also tends to infinitesimal (i.e. low level), and when the speaker 7 is not open-circuited, the sampling voltage can be calculated according to the resistance ratio of the sampling resistor to the internal resistance of the speaker 7, so that whether the speaker 7 is open-circuited or not can be judged according to the voltage value of the sampling voltage.
And a fourth resistor R4 and a first capacitor C1 are also arranged for voltage filtering, so that signal interference can be avoided, and the accuracy of signal acquisition is further improved, namely the accuracy of open-circuit detection of the loudspeaker 7 is improved.
In the present embodiment, the resistance of the fourth resistor R4 is preferably 10K ohms, and the capacitance of the first capacitor C1 is preferably 10Nf (nanofarad).
In this embodiment, the first resistor R1 and the second resistor R2 with equal resistance values are disposed at the bases of the first switch tube Q1 and the second switch tube Q2, and are used as current-limiting resistors of the detection circuit, so that the driving current at the bases of the switch tubes can be effectively prevented from being too large to damage the main control module 1; the third resistor R3 with the resistance value much larger than the internal resistance of the loudspeaker 7 is set as the sampling resistor, which can ensure that the voltage divided by the sampling resistor when the loudspeaker 7 works normally is enough (i.e. high level) and is distinguished from the sampling voltage (i.e. low level) on the sampling resistor when the circuit is equivalent to open circuit when the loudspeaker 7 breaks down; so that the main control module 1 can directly judge whether the loudspeaker 7 is open or not according to the sampling voltage.
The embodiment of the utility model also comprises a digital-to-analog conversion module 3 and a power amplification module 4 which are sequentially connected between the main control module 1 and the loudspeaker 7; the storage module 5 and the data connection module 6 are connected with the main control module 1;
the digital-to-analog conversion module 3 is used for converting the control instruction output by the main control module 1 into an analog signal from a digital signal;
the power amplification module 4 is used for amplifying the analog signal to preset power to drive the loudspeaker 7;
the storage module 5 is used for presetting open circuit judgment logic and playing materials;
the data connection module 6 is used for outputting the diagnosis command of the user to the main control module 1;
the main control module 1 is used for acquiring an open circuit detection result according to a preset open circuit judgment logic and the sampling voltage.
The data connection module 6 is a CAN BUS module; the storage module 5 is a Nor Flash storage; the main control module 1 is an MCU.
In this embodiment, the preset open-circuit judgment logic is: when the sampling voltage is low level, judging that the loudspeaker 7 is open-circuit; when the sampling voltage is at a high level, it is judged that the speaker 7 is operating normally.
In the present embodiment, the open circuit detection principle of the speaker 7 is as follows:
when the speaker 7 is detected, the data connection module 6 outputs a diagnostic command of a user to the main control module 1, and at this time, the main control module 1 responds to the diagnostic command to turn off the I2S signal output to the digital-to-analog conversion module 3, that is, the driving circuit of the main control module 1, the data connection module 6, the power amplification module 4 and the speaker 7 is disconnected.
Subsequently, the main control module 1 controls the first signal output terminal Ctrol1 to output a high level and the second signal output terminal Ctrol2 to output a low level, so that the first switch tube Q1 is turned on, the second switch tube Q2 is turned on, and the third resistor R3 is grounded, that is, a driving loop of the speaker 7 is turned on.
At this time, the main control module 1 acquires the divided voltage on the third resistor R3, namely the sampling voltage, through the signal output end IO-FB. The main control module 1 judges that the loudspeaker 7 is open-circuit according to the preset open-circuit judgment logic when the sampling voltage is low level; when the sampling voltage is at a high level, it is judged that the speaker 7 is operating normally.
And finally, sending an open circuit detection result (whether the loudspeaker is open or not) to a vehicle-mounted diagnostic instrument through the CAN BUS module, and prompting a detector to carry out related fault maintenance.
The embodiment of the utility model provides an add half-bridge drive circuit 21 at the both ends of speaker 7, under the prerequisite of major loop power disconnection (namely after major control module 1 breaks off digital-to-analog conversion module 3, power amplification module 4's drive power supply), order major control module 1 control sampling detection circuit 2 to supply power to speaker 7, set up sampling resistor at the base end of half-bridge drive circuit 21, utilize detection circuit 22 to gather the voltage value on the sampling resistor and obtain sampling voltage, and judge whether speaker 7 opens a way according to the open circuit judgement logic of predetermineeing; and then will send the on-vehicle diagnostic instrument according to the detection result of opening a way through CAN BUS module, inform the car owner or 4S shop change loudspeaker 7 of trouble, further promote the quality of service of on-vehicle loudspeaker 7.
The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.
Claims (7)
1. A speaker open circuit detection circuit, comprising: the main control module and a sampling detection circuit connected with the main control module; the sampling detection circuit is connected to two ends of the loudspeaker and comprises a half-bridge drive circuit and a detection circuit which are mutually connected; the main control module comprises a first signal output end, a second signal output end and a signal output end.
2. A loudspeaker open circuit detection circuit as claimed in claim 1, wherein: the half-bridge driving circuit comprises a first resistor, a second resistor, a third resistor, a first switching tube and a second switching tube;
the first resistor is connected with a first signal output end, and the other end of the first resistor is connected to one end of the loudspeaker through a first switch tube; one end of the second resistor is connected with the second signal output end, and the other end of the second resistor is connected to the other end of the loudspeaker through the second switch tube and the third resistor;
the third resistor is a sampling resistor.
3. A loudspeaker open circuit detection circuit as claimed in claim 1, wherein: the detection circuit comprises a fourth resistor and a first capacitor; one end of the fourth resistor is connected with the other end of the loudspeaker, and the other end of the fourth resistor is grounded through the first capacitor and connected to the signal output end.
4. A loudspeaker open circuit detection circuit as claimed in claim 2, characterized in that: the first switch tube is a PNP type triode or a PNP type MOS tube; the second switch tube is an NPN type triode or an NPN type MOS tube.
5. A loudspeaker open circuit detection circuit as claimed in claim 2, characterized in that: the resistance values of the first resistor and the second resistor are equal; the resistance value of the third resistor is far larger than the internal resistance of the loudspeaker.
6. A loudspeaker open circuit detection circuit as claimed in claim 1, wherein: the digital-to-analog conversion module and the power amplification module are sequentially connected between the main control module and the loudspeaker; and the storage module and the data connection module are connected with the main control module.
7. A loudspeaker open circuit detection circuit as claimed in claim 6, wherein: the data connection module is a CAN BUS module; the storage module is a Nor Flash storage; the main control module is an MCU.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022273485.5U CN214070164U (en) | 2020-10-13 | 2020-10-13 | Loudspeaker open circuit detection circuit |
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| CN202022273485.5U CN214070164U (en) | 2020-10-13 | 2020-10-13 | Loudspeaker open circuit detection circuit |
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| CN214070164U true CN214070164U (en) | 2021-08-27 |
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| CN202022273485.5U Active CN214070164U (en) | 2020-10-13 | 2020-10-13 | Loudspeaker open circuit detection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022199157A1 (en) * | 2021-03-22 | 2022-09-29 | 苏州上声电子股份有限公司 | Vehicle-mounted sound system and open circuit detection method for loudspeaker thereof |
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2020
- 2020-10-13 CN CN202022273485.5U patent/CN214070164U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022199157A1 (en) * | 2021-03-22 | 2022-09-29 | 苏州上声电子股份有限公司 | Vehicle-mounted sound system and open circuit detection method for loudspeaker thereof |
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