WO2022199157A1 - 一种车载音响系统及其扬声器开路检测方法 - Google Patents

一种车载音响系统及其扬声器开路检测方法 Download PDF

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WO2022199157A1
WO2022199157A1 PCT/CN2021/139480 CN2021139480W WO2022199157A1 WO 2022199157 A1 WO2022199157 A1 WO 2022199157A1 CN 2021139480 W CN2021139480 W CN 2021139480W WO 2022199157 A1 WO2022199157 A1 WO 2022199157A1
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electrically connected
port
resistor
open
control module
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PCT/CN2021/139480
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English (en)
French (fr)
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丁洪兵
吴渝蓉
毛君丽
瞿成名
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苏州上声电子股份有限公司
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Priority to EP21932764.0A priority Critical patent/EP4319200A1/en
Priority to JP2023558257A priority patent/JP2024512018A/ja
Priority to US18/551,814 priority patent/US20240179461A1/en
Publication of WO2022199157A1 publication Critical patent/WO2022199157A1/zh

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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
    • 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
    • H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R29/00—Monitoring arrangements; Testing arrangements
    • H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/54—Testing for continuity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
    • H04R2201/02—Details casings, cabinets or mounting therein for transducers covered by H04R1/02 but not provided for in any of its subgroups
    • H04R2201/028—Structural combinations of loudspeakers with built-in power amplifiers, e.g. in the same acoustic enclosure
    • 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
    • H04R2420/03—Connection circuits to selectively connect loudspeakers or headphones to amplifiers
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10—General applications
    • H04R2499/13—Acoustic transducers and sound field adaptation in vehicles

Definitions

  • the invention belongs to the field of audio, and in particular relates to a vehicle audio system and a method for detecting open-circuit of a speaker thereof.
  • the power amplifier chip will have its own diagnostic and protection functions for speaker open circuit and short circuit, and this type of power amplifier chip is expensive and expensive.
  • the car power amplifier chip used in the car audio system does not have the function of speaker open circuit diagnosis.
  • this type of power amplifier chip to detect whether there are speakers installed in the car or whether the speakers are correctly connected, it is necessary to add a speaker open circuit detection circuit and system to the mass-produced product to complete this function to determine whether In the open-speaker state, the open-speaker means that there is no speaker installed or the speaker is installed but not properly connected.
  • one object of the present invention is to provide an in-vehicle audio system, which can realize open-circuit detection of speakers of the in-vehicle audio system at a lower cost.
  • Another object of the present invention is to provide a method for detecting an open-circuit speaker of an in-vehicle audio system, which can realize the open-circuit detection of a speaker of the in-vehicle audio system at a lower cost.
  • a car audio system comprising:
  • Amplifiers for driving vehicle speakers to which they are electrically connected are electrically connected;
  • control module for controlling the power amplifier, the control module has an output port and an input port;
  • the vehicle audio system also includes:
  • An open circuit detection circuit has a first connection port and a second connection port, one of the first connection port and the second connection port is electrically connected to the positive lead of the vehicle speaker and the other is electrically connected to the vehicle The negative lead of the speaker is electrically connected;
  • the open circuit detection circuit includes a switch circuit, the switch circuit is connected between the output port of the control module and the first connection port, and is controlled by a control signal from the output port to connect the output port. Connecting or disconnecting with the first connection port;
  • the input port of the control module and the second connection port are respectively electrically connected to a node, and the node is connected to a voltage;
  • the control module is configured to enable the open-circuit detection circuit to determine whether the speaker is in an open-circuit state according to the signal received by the input port through the output port.
  • speaker open circuit means that the car speakers are not installed or installed but not connected properly, such as not properly connected to the power amplifier.
  • the switch circuit includes a triode, the base of the triode is electrically connected to the output port, the collector of the triode is electrically connected to the first connection port, and the transmitter of the triode is electrically connected to the first connection port. pole ground.
  • the triode is an NPN type triode.
  • the switch circuit further includes a first resistor and a second resistor, the first resistor is electrically connected between the output port and the gate of the triode, and one end of the second resistor is It is electrically connected to the middle point of the first resistor and the gate of the triode, and the other end of the second resistor is electrically connected to the collector of the triode.
  • the first resistor, the second resistor and the transistor together form a switch circuit.
  • the open circuit detection circuit further includes a third resistor connected between the switch circuit and the first connection terminal.
  • the third resistor is used for current limiting.
  • the node is electrically connected to a power supply terminal to receive a voltage.
  • the open circuit detection circuit further includes a fourth resistor for pulling up the level transmitted to the IO terminal, the fourth resistor is electrically connected between the power supply terminal and the node.
  • the open-circuit detection circuit further includes a diode for preventing the power amplifier voltage from hitting the control module, and the diode is electrically connected between the second connection terminal and the input port.
  • the open circuit detection circuit further includes a capacitor, one end of the capacitor is electrically connected to the middle point between the second connection end and the input port, and the other end is grounded.
  • the power amplifier is a BTL power amplifier; and/or, the control module is a power amplifier chip, and the output port and the input port are respectively IO ports of the power amplifier chip; and/or, the The loudspeaker is a loudspeaker with an impedance range of 2 to 8 ⁇ .
  • an open circuit detection circuit for a car audio system is characterized in that it has a first connection port and a second connection port, one of the first connection port and the second connection port The other one is used to be electrically connected to the positive lead of the car speaker and the other is used to be electrically connected to the negative lead of the car speaker;
  • the open circuit detection circuit includes a switch circuit, the switch circuit is connected between the output port of the control module of the power amplifier and the first connection port, and is controlled by a control signal from the output port to connect the output port. Connecting or disconnecting with the first connection port;
  • the second connection port is used for electrically connecting with the input port of the control module to a node for accessing the voltage.
  • the switch circuit includes a triode, the base of the triode is electrically connected to the output port, the collector of the triode is electrically connected to the first connection port, and the transmitter of the triode is electrically connected to the first connection port. pole ground.
  • the switch circuit further includes a first resistor and a second resistor, the first resistor is electrically connected between the output port and the gate of the triode, and one end of the second resistor is is electrically connected to the middle point of the first resistor and the gate of the triode, and the other end of the second resistor is electrically connected to the collector of the triode;
  • the open circuit detection circuit further includes a circuit connected to the a third resistor between the switch circuit and the first connection terminal; the node is electrically connected to a power supply terminal to access a voltage, the open circuit detection circuit further includes a fourth resistor, and the fourth resistor is electrically connected between the power supply terminal and the node.
  • a method for detecting an open-circuit speaker of a vehicle-mounted audio system wherein the vehicle-mounted audio system is the vehicle-mounted audio system as described above, and the method for detecting an open-circuit speaker of the speaker comprises an open-circuit detection step, and the open-circuit detection step Specifically include:
  • the speaker open circuit detection method further includes the step of: enabling the power amplifier to be in an off state, and the output port and the input port to be in a low-level state when initially powered on.
  • the present invention adopts the above scheme, has the following advantages compared with the prior art:
  • an open circuit detection circuit is provided outside the control module, and the control module can determine whether the signal output from the open circuit detection circuit to the input port of the control module is a high level or a low level to determine whether the speaker is at a high level or not.
  • Open-circuit thereby disabling the power amplifier or enabling the normal output of the power amplifier, without using an expensive power amplifier chip with its own open-circuit detection function, which can realize speaker open-circuit detection at a lower cost.
  • FIG. 1 is a structural block diagram of a car audio system according to an embodiment of the present invention.
  • FIG. 2 is a circuit diagram of an open circuit detection circuit according to an embodiment of the present invention.
  • FIG. 3 is a flowchart of a method for detecting an open circuit of a speaker according to an embodiment of the present invention.
  • the terms “comprising” and “comprising” only imply that the clearly identified steps and elements are included, and these steps and elements do not constitute an exclusive list.
  • the method or apparatus may also include other steps or elements.
  • the term “and/or” includes any combination of one or more of the associated listed items.
  • first”, “second”, etc. are used to describe various information, but the information should not be limited to these terms. These terms are only used to distinguish the same type of information from one another, and do not imply a particular order or level of importance.
  • the expressions “first”, “second” etc. are used completely interchangeably.
  • the first information may also be referred to as the second information
  • the second information may also be referred to as the first information, without departing from the scope of the present disclosure.
  • this embodiment provides a car audio system, which includes: a power amplifier 1 , which is used to drive a speaker 2 that is electrically connected to it to perform electro-acoustic conversion; a control module 4 , which is used to control the power amplifier 1 ,
  • the control module 4 has an output port OpenChk_1 and an input port 1_Open_Sense.
  • the car audio system also includes an open circuit detection circuit 3, the first connection port SPK1- and the second connection port SPK1+, the first connection port SPK1- is electrically connected to one of the two sets of leads of the speaker 2 (such as the negative lead) , the second connection port SPK1+ is electrically connected to the other one of the two sets of leads of the speaker 2 (eg, the positive lead).
  • the output port of the power amplifier is also electrically connected to the two sets of lead wires of the speaker, so as to output the digital audio signal or the analog audio signal to the speaker.
  • each group of leads contains one lead, that is, speaker 2 has a pair of leads; while for a multi-voice coil speaker, each group of leads may contain multiple leads, that is, speaker 2 has multiple pairs of leads.
  • the open circuit detection circuit 3 further includes a switch circuit 30.
  • the switch circuit 30 is connected between the output port OpenChk_1 of the control module 4 and the first connection port SPK1- of the open circuit detection circuit 3, so as to be controlled by the output port OpenChk_1- of the open circuit detection circuit 3.
  • the control signal of the port OpenChk_1 turns on or off the output port OpenChk_1 and the first connection port SPK1-.
  • the open circuit detection circuit 3 is enabled through the pulse signal given by the output port OpenChk_1 of the control module 4, and then the input port 1_Open_Sense is used to determine the difference between the second connection port SPK1+ and the first connection port SPK1-. Whether there is a speaker 2 indirectly or whether the speaker 2 is open circuit fault.
  • the power amplifier 1 is specifically a multi-channel power amplifier with multiple channels, and each channel can drive at least one speaker.
  • Power amplifier 1 is a BTL power amplifier, a CLASS-D digital power amplifier, with short circuit protection function and no open circuit detection function.
  • the control module 4 is a power amplifier chip, specifically a single-chip microcomputer (MCU), the single-chip microcomputer includes a single-chip microcomputer body, an output port OpenChk_1 and an input port 1_Open_Sense, wherein the output port OpenChk_1 and the input port 1_Open_Sense are the IO ports of the power amplifier chip respectively; the speaker 2 is an impedance Speakers in the range of 2 to 8 ⁇ .
  • MCU single-chip microcomputer
  • the switch circuit 30 specifically includes a transistor Q5 (the transistor is specifically an NPN type transistor), the base of the transistor Q5 is electrically connected to the output port OpenChk_1, and the collector of the transistor Q5 is electrically connected to the first connection port SPK1- Connected, the emitter of transistor Q5 is grounded (equipotential of the earth).
  • the input port 1_Open_Sense and the second connection port SPK1+ of the control module 4 are respectively electrically connected to a node A, and the node A is electrically connected to a power supply terminal VDD-MCU to receive a voltage, which is consistent with the working voltage of the power amplifier chip.
  • the control module 4 is configured to enable the open circuit detection circuit 3 through the output port OpenChk_1 to determine whether the speaker is open circuit according to the signal received by the input port 1_Open_Sense.
  • the switch circuit 30 further includes a first resistor R65 and a second resistor R73, the first resistor R65 is electrically connected between the output port OpenChk_1 and the gate of the transistor Q5, and one end of the second resistor R73 is electrically connected to the first resistor R65 and the gate of the transistor Q5. The middle point of the gate of the transistor Q5, and the other end of the second resistor R73 is electrically connected to the collector of the transistor Q5.
  • the first resistor R65 , the second resistor R73 and the transistor Q5 together form the switch circuit 30 .
  • the open circuit detection circuit 3 further includes a third resistor R33 connected between the switch circuit and the first connection port SPK1-, and the third resistor R33 is used for current limiting.
  • the open circuit detection circuit 3 further includes a fourth resistor R71 for pulling up the level transmitted to the IO terminal, and the fourth resistor R71 is electrically connected between the power supply terminal VDD-MCU and the node A.
  • the open circuit detection circuit 3 further includes a diode D6 for preventing the power amplifier voltage from counteracting to the control module 4, and the diode D6 is electrically connected between the second connection port SPK1+ and the input port 1_Open_Sense. Specifically, the anode of the diode D6 is connected to the node A, and the cathode is connected to the second connection port SPK1+.
  • the open circuit detection circuit 3 also includes a capacitor C20 for filtering out high-frequency signals from the power amplifier.
  • One end of the capacitor C20 is electrically connected to the middle point between the second connection port SPK1+ and the input port 1_Open_Sense, and the other end is grounded (equipotential of the earth) .
  • This embodiment also provides a method for detecting an open-circuit speaker of a car audio system, where the car audio system is the above car audio system.
  • the speaker open circuit detection method includes an open circuit detection step, and the open circuit detection step specifically includes:
  • the enabling power amplifier 1 is in the off state, and the output port OpenChk_1 and the input port 1_Open_Sense are in the low level state;
  • the MCU in the initial power-on stage of the power amplifier system, the MCU does not start the power amplifier chip first, so that the power amplifier is in the STANDBY state, so that the output of the power amplifier is in a high impedance state.
  • the open circuit detection circuit consists of two IO ports OpenChk_1 and 1_Open_Sense of MCU, resistors R33, R65, R71, R73, capacitor C20, diode D6, and transistor Q5. Using two IO ports of the MCU, one is configured as output and the other is configured as input.
  • the transistor Q5 is turned on.
  • 1_Open_Sense When the speaker is not connected or the speaker is open-circuit fault, 1_Open_Sense is high level, and the MCU judges that the speaker is open-circuited; when the transistor Q5 is turned on, and there is a speaker between SPK1+ and SPK1-, the 1_Open_Sense port will be pulled low, and the MCU will receive When the low-level signal of the 1_Open_Sense port is reached, it will be judged that the speaker is in a non-open state. After judging the non-open state of the speaker, enable the OpenChk_1 port to be low-level output, turn off the transistor Q5, enable the output of the power amplifier, and make the power amplifier in a normal working state.
  • This embodiment provides a car audio system, which has an independent power amplifier 1, a control module 4 and an open circuit detection circuit 3, which can be determined by judging whether the signal of the input terminal 1_Open_Sense of the control module 4 is a high level or a low level. Whether the speaker is open, thereby disabling the amplifier or enabling the normal output of the amplifier.
  • the speaker open-circuit detection method provided in this embodiment can complete the open-circuit detection of the speaker without using an external circuit and system, without using an expensive power amplifier chip with its own open-circuit detection function, and without affecting the normal operation of the system. Loudspeaker open circuit detection can be implemented at low cost.

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Abstract

一种车载音响系统及其扬声器开路检测方法。该车载音响系统包括：功放，其用于驱动与其电性连接的车载扬声器；控制模块，其用于控制功放并具有输出端口和输入端口；开路检测电路，其具有用于分别和扬声器的两组引线电性连接的第一连接端口和第二连接端口；开路检测电路还包括开关电路，开关电路连接于控制模块的输出端口和第一连接端口之间，以受控于来自输出端口的控制信号而将输出端口和第一连接端导通或断开；控制模块的输入端口和第二连接端口分别电性连接于一节点，节点接入电压；控制模块用于通过输出端口使能开路检测电路根据输入端口接收到的信号判断是否处于扬声器开路状态。本发明能够以较低的成本实现扬声器开路检测。

Description

一种车载音响系统及其扬声器开路检测方法
本公开要求2021年3月22日提交的申请号为CN2021103013728的中国专利申请的优先权。
技术领域
本发明属于音响领域，具体涉及一种车载音响系统及其扬声器开路检测方法。
背景技术
目前，功放芯片会自带扬声器开路和短路的诊断和保护功能，这类功放芯片价格昂贵、成本较高。然而，在车载音响系统中，考虑到成本原因，车载音响系统采用的车载功放芯片不带有扬声器开路诊断的功能。在选用这类功放芯片的时候，要检测车上有没有安装扬声器或者扬声器有没有被正确接入，就须在量产产品上加上扬声器开路检测的电路和系统完成此项功能，以确定是否处于扬声器开路状态，扬声器开路是指没有安装扬声器或虽然安装了扬声器但未正确接入。
发明内容
针对上述问题，本发明的一个目的是提供一种车载音响系统，能够以较低的成本实现车载音响系统的扬声器开路检测。
本发明的另一个目的是提供一种车载音响系统的扬声器开路检测方法，能够以较低的成本实现车载音响系统的扬声器开路检测。
根据本发明的第一个方面，一种车载音响系统，包括：
功放，其用于驱动与其电性连接的车载扬声器；及
控制模块，其用于控制所述功放，所述控制模块具有输出端口和输入端口；
所述车载音响系统还包括：
开路检测电路，其具有第一连接端口和第二连接端口，所述第一连接端口和所述第二连 接端口中的一个和所述车载扬声器的正极引线电性连接而另一个和所述车载扬声器的负极引线电性连接；
所述开路检测电路包括开关电路，所述开关电路连接于所述控制模块的输出端口和所述第一连接端口之间，以受控于来自所述输出端口的控制信号而将所述输出端口和所述第一连接端口导通或断开；
所述控制模块的输入端口和所述第二连接端口分别电性连接于一节点，所述节点接入电压；
所述控制模块用于通过所述输出端口使能所述开路检测电路根据所述输入端口接收到的信号判断是否处于扬声器开路状态。
本文中，“扬声器开路”是指没有安装车载扬声器或安装了车载扬声器但未正确接入，例如没有和功放正确连接。
在一实施例中，所述开关电路包括三极管，所述三极管的基极和所述输出端口电性连接，所述三极管的集电极和所述第一连接端口电性连接，所述三极管的发射极接地。可选地，所述三极管为NPN型三极管。
在一实施例中，所述开关电路还包括第一电阻和第二电阻，所述第一电阻电性连接于所述输出端口和所述三极管的栅极之间，所述第二电阻的一端电性连接于所述第一电阻和所述三极管的栅极的中间点，所述第二电阻的另一端电性连接于所述三极管的集电极。
在一实施例中，第一电阻，第二电阻和三极管共同组成开关电路。
在一实施例中，所述开路检测电路还包括连接于所述开关电路和所述第一连接端之间的第三电阻。所述第三电阻用于限流。
在一实施例中，所述节点电性连接于一供电端以接入电压。
在一实施例中，所述开路检测电路还包括用于上拉输送至IO端的电平的第四电阻，所述第四电阻电性连接于所述供电端和所述节点之间。
在一实施例中，所述开路检测电路还包括用于防止功放电压反击到所述控制模块的二极管，所述二极管电性连接于所述第二连接端和所述输入端口之间。
在一实施例中所述开路检测电路还包括电容，所述电容的一端电性连接于所述第二连接端和所述输入端口的中间点，另一端接地。
在一实施例中，所述功放为BTL功放；和/或，所述控制模块为功放芯片，所述输出端口和所述输入端口分别为所述功放芯片的IO端口；和/或，所述扬声器为阻抗范围在2～8Ω的扬声器。
根据本发明的第二个方面，一种车载音响系统的开路检测电路，其特征在于，具有第一连接端口和第二连接端口，所述第一连接端口和所述第二连接端口中的一个用于和车载扬声器的正极引线电性连接而另一个用于和所述车载扬声器的负极引线电性连接；
所述开路检测电路包括开关电路，所述开关电路连接于功放的控制模块的输出端口和所述第一连接端口之间，以受控于来自所述输出端口的控制信号而将所述输出端口和所述第一连接端口导通或断开；
所述第二连接端口用于和所述控制模块的输入端口电性连接于一用于接入电压的节点。
在一实施例中，所述开关电路包括三极管，所述三极管的基极和所述输出端口电性连接，所述三极管的集电极和所述第一连接端口电性连接，所述三极管的发射极接地。
在一实施例中，所述开关电路还包括第一电阻和第二电阻，所述第一电阻电性连接于所述输出端口和所述三极管的栅极之间，所述第二电阻的一端电性连接于所述第一电阻和所述三极管的栅极的中间点，所述第二电阻的另一端电性连接于所述三极管的集电极；所述开路检测电路还包括连接于所述开关电路和所述第一连接端之间的第三电阻；所述节点电性连接于一供电端以接入电压，所述开路检测电路还包括第四电阻，所述第四电阻电性连接于所述供电端和所述节点之间。
根据本发明的第三个方面，一种车载音响系统的扬声器开路检测方法，所述车载音响系统为如上所述的车载音响系统，所述扬声器开路检测方法包括开路检测步骤，所述开路检测步骤具体包括：
使能所述控制模块的所述输出端口，将所述开关电路导通；
当所述控制模块的所述输入端口的信号为高电平信号，判定所述车载扬声器处于开路状 态；
当所述控制模块的所述输入端口的信号为低电平信号时，判定所述车载扬声器处于非开路状态。
在一实施例中，所述扬声器开路检测方法还包括如下步骤：初始上电时，使能所述功放处于关闭状态，所述输出端口和所述输入端口处于低电平状态。
本发明采用以上方案，相比现有技术具有如下优点：
本发明的车载音响系统及扬声器开路检测方法，在控制模块外设置开路检测电路，能够通过控制模块判断由开路检测电路输出至控制模块输入端口的信号是高电平还是低电平来判定扬声器是否开路，从而禁用功放或使能功放正常输出，无需使用价格昂贵的自带开路检测功能的功放芯片，能够以较低的成本实现扬声器开路检测。
附图说明
为了更清楚地说明本发明的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为根据本发明一实施例的一种车载音响系统的结构框图；
图2是根据本发明一实施例的一种开路检测电路的电路图；
图3为根据本发明一实施例的一种扬声器开路检测方法的流程图。
具体实施方式
下面结合附图对本的较佳实施例进行详细阐述，以使本发明的优点和特征能更易于被本领域的技术人员理解。在此需要说明的是，对于这些实施方式的说明用于帮助理解本发明，但并不构成对本发明的限定。此外，下面所描述的本发明各个实施方式中所涉及到的技术特征只要彼此之间未构成冲突就可以互相结合。
如本说明书和权利要求书中所示，术语“包括”与“包含”仅提示包括已明确标识的步骤和元素，而这些步骤和元素不构成一个排它性的罗列，方法或者设备也可能包含其他的步骤或元素。本文所使用的术语“和/或”包括一个或多个相关的所列项目的任意的组合。进一步可以理 解的是，术语“第一”、“第二”等用于描述各种信息，但这些信息不应限于这些术语。这些术语仅用来将同一类型的信息彼此区分开，并不表示特定的顺序或者重要程度。实际上，“第一”、“第二”等表述完全可以互换使用。例如，在不脱离本公开范围的情况下，第一信息也可以被称为第二信息，类似地，第二信息也可以被称为第一信息。
如图1所示，本实施例提供一种车载音响系统，其包括：功放1，其用于驱动与其电性连接的扬声器2，进行电声转换；控制模块4，其用于控制功放1，控制模块4具有输出端口OpenChk_1和输入端口1_Open_Sense。该车载音响系统还包括开路检测电路3，其第一连接端口SPK1-和第二连接端口SPK1+，第一连接端口SPK1-电性连接于扬声器2的两组引线中的一组(如负极引线)，第二连接端口SPK1+电性连接于扬声器2的两组引线中的另一组(如正极引线)。功放的输出端口也对应电性连接至扬声器的两组引线，以向扬声器输出数字音频信号或模拟音频信号。对于普通的扬声器，每组引线包含一个引线，即扬声器2具有一对引线；而对于多音圈扬声器，每组引线可能包含多个引线，即扬声器2具有多对引线。如图2所示，该开路检测电路3还包括开关电路30，开关电路30连接于控制模块4的输出端口OpenChk_1和开路检测电路3的第一连接端口SPK1-之间，以受控于来自输出端口OpenChk_1的控制信号而将输出端口OpenChk_1和第一连接端口SPK1-导通或断开。整个系统在功放启动初始状态时，通过控制模块4的输出端口OpenChk_1给出的脉冲信号，使能开路检测电路3，再通过输入端口1_Open_Sense来判断第二连接端口SPK1+和第一连接端口SPK1-之间是否接有扬声器2或者扬声器2是否开路故障。功放1具体为具有多个通道的多通道功放，每个通道都能够驱动至少一个扬声器。
功放1为BTL功放，是一款CLASS-D数字功放，有短路保护功能，无开路检测功能。控制模块4为功放芯片，具体是一种单片机(MCU)，该单片机包括单片机本体，输出端口OpenChk_1和输入端口1_Open_Sense，其中输出端口OpenChk_1和输入端口1_Open_Sense分别为功放芯片的IO端口；扬声器2为阻抗范围在2～8Ω的扬声器。
如图2所示，开关电路30具体包括三极管Q5(该三极管具体为NPN型三极管)，三极管Q5的基极和输出端口OpenChk_1电性连接，三极管Q5的集电极和第一连接端口SPK1-电性连接，三极管Q5的发射极接地(大地等电位)。控制模块4的输入端口1_Open_Sense和第二连接端口SPK1+分别电性连接于一节点A，节点A电性连接于一供电端VDD-MCU以接 入电压，该电压与功放芯片的工作电压一致。
控制模块4用于通过输出端口OpenChk_1使能开路检测电路3根据输入端口1_Open_Sense接收到的信号判断是否扬声器开路。
开关电路30还包括第一电阻R65和第二电阻R73，第一电阻R65电性连接于输出端口OpenChk_1和三极管Q5的栅极之间，第二电阻R73的一端电性连接于第一电阻R65和三极管Q5的栅极的中间点，第二电阻R73的另一端电性连接于三极管Q5的集电极。第一电阻R65，第二电阻R73和三极管Q5共同组成开关电路30。
开路检测电路3还包括连接于开关电路和第一连接端口SPK1-之间的第三电阻R33，该第三电阻R33用于限流。
开路检测电路3还包括用于上拉输送至IO端的电平的第四电阻R71，该第四电阻R71电性连接于供电端VDD-MCU和节点A之间。
开路检测电路3还包括用于防止功放电压反击到控制模块4的二极管D6，二极管D6电性连接于第二连接端口SPK1+和输入端口1_Open_Sense之间。具体地，二极管D6的正极连接于节点A，负极连接于第二连接端口SPK1+。
开路检测电路3还包括电容C20，用于滤除来自功放的高频信号，该电容C20的一端电性连接于第二连接端口SPK1+和输入端口1_Open_Sense的中间点，另一端接地(大地等电位)。
本实施例还提供一种车载音响系统的扬声器开路检测方法，车载音响系统为如上的车载音响系统。如图3所示，该扬声器开路检测方法包括开路检测步骤，开路检测步骤具体包括：
初始上电时，使能功放1处于关闭状态，输出端口OpenChk_1和输入端口1_Open_Sense处于低电平状态；
使能控制模块4的输出端口OpenChk_1，将开关电路导通；
当控制模块4的输入端口1_Open_Sense的信号为高电平信号，判定扬声器2开路；
当控制模块4的输入端口1_Open_Sense的信号为低电平信号时，判定扬声器2处于非开路状态。
本实施例中，在功放系统的初始上电阶段MCU先不启动功放芯片，让功放处于STANDBY状态，这样功放输出是处于高阻抗的状态。开路检测电路由MCU的两个IO口OpenChk_1和1_Open_Sense，电阻R33、R65、R71、R73，电容C20，二极管D6，三极管Q5组成。利用MCU的两个IO口，一个配置为输出，一个配置为输入。当在初始上电时，功放输出是高阻抗的情况下，使能MCU的输出IO口OpenChk_1为高电平，这样的话，三极管Q5导通。当没有接扬声器或者扬声器开路故障的时候，1_Open_Sense是高电平，MCU判断扬声器开路；当三级管Q5导通时，SPK1+和SPK1-之间有扬声器时，1_Open_Sense口会被拉低，MCU接收到1_Open_Sense口的低电平信号时，会判断扬声器处于非开路状态。判断完扬声器的非开路状态后，使能OpenChk_1口为低电平输出，使三极管Q5截止，使能功放输出，使功放处于正常工作状态。本实施例提供的一种车载音响系统，其具有相互独立的功放1、控制模块4及开路检测电路3，能够通过判断控制模块4的输入端1_Open_Sense的信号是高电平还是低电平来判定扬声器是否开路，从而禁用功放或使能功放正常输出。
本实施例提供的扬声器开路检测方法，能够在不假借外部电路和系统的情况下完成对扬声器的开路检测，无需使用价格昂贵的自带开路检测功能的功放芯片，同时不影响系统的正常运作，能够以较低的成本实现扬声器开路检测。
上述实施例只为说明本发明的技术构思及特点，是一种优选的实施例，其目的在于熟悉此项技术的人士能够了解本发明的内容并据以实施，并不能以此限定本发明的保护范围。

Claims (15)

  1. 一种车载音响系统，包括：
    功放，其用于驱动与其电性连接的车载扬声器；
    控制模块，其用于控制所述功放，所述控制模块具有输出端口和输入端口；
    其特征在于，所述车载音响系统还包括：
    开路检测电路，其具有第一连接端口和第二连接端口，所述第一连接端口和所述第二连接端口中的一个和所述车载扬声器的正极引线电性连接而另一个和所述车载扬声器的负极引线电性连接；
    所述开路检测电路包括开关电路，所述开关电路连接于所述控制模块的输出端口和所述第一连接端口之间，以受控于来自所述输出端口的控制信号而将所述输出端口和所述第一连接端口导通或断开；
    所述控制模块的输入端口和所述第二连接端口分别电性连接于一节点，所述节点用于接入电压；
    所述控制模块用于通过所述输出端口使能所述开路检测电路并根据所述输入端口接收到的信号判断是否处于扬声器开路状态。
  2. 根据权利要求1所述的车载音响系统，其特征在于，所述开关电路包括三极管，所述三极管的基极和所述输出端口电性连接，所述三极管的集电极和所述第一连接端口电性连接，所述三极管的发射极接地。
  3. 根据权利要求2所述的车载音响系统，其特征在于，所述开关电路还包括第一电阻和第二电阻，所述第一电阻电性连接于所述输出端口和所述三极管的栅极之间，所述第二电阻的一端电性连接于所述第一电阻和所述三极管的栅极的中间点，所述第二电阻的另一端电性连接于所述三极管的集电极。
  4. 根据权利要求1所述的车载音响系统，其特征在于，所述开路检测电路还包括连接于所述开关电路和所述第一连接端之间的第三电阻。
  5. 根据权利要求1所述的车载音响系统，其特征在于，所述节点电性连接于一供电端以接入电压。
  6. 根据权利要求5所述的车载音响系统，其特征在于，所述开路检测电路还包括第四电阻，所述第四电阻电性连接于所述供电端和所述节点之间。
  7. 根据权利要求1所述的车载音响系统，其特征在于，所述开路检测电路还包括用于防止功放电压反击到所述控制模块的二极管，所述二极管电性连接于所述第二连接端和所述输入端口之间。
  8. 根据权利要求1所述的车载音响系统，其特征在于，所述开路检测电路还包括电容，所述电容的一端电性连接于所述第二连接端和所述输入端口的中间点，另一端接地。
  9. 根据权利要求1至8任一项所述的车载音响系统，其特征在于，所述功放为BTL功放；和/或，所述控制模块为功放芯片，所述输出端口和所述输入端口分别为所述功放芯片的IO端口。
  10. 根据权利要求1所述的车载音响系统，其特征在于，所述车载扬声器为阻抗范围在2～8Ω的扬声器。
  11. 一种车载音响系统的开路检测电路，其特征在于，具有第一连接端口和第二连接端口，所述第一连接端口和所述第二连接端口中的一个用于和车载扬声器的正极引线电性连接而另一个用于和所述车载扬声器的负极引线电性连接；
    所述开路检测电路包括开关电路，所述开关电路连接于功放的控制模块的输出端口和所述第一连接端口之间，以受控于来自所述输出端口的控制信号而将所述输出端口和所述第一连接端口导通或断开；
    所述第二连接端口用于和所述控制模块的输入端口电性连接于一用于接入电压的节点。
  12. 根据权利要求11所述的开路检测电路，其特征在于，所述开关电路包括三极管，所述三极管的基极和所述输出端口电性连接，所述三极管的集电极和所述第一连接端口电性连接，所述三极管的发射极接地。
  13. 根据权利要求12所述的开路检测电路，其特征在于，所述开关电路还包括第一电阻 和第二电阻，所述第一电阻电性连接于所述输出端口和所述三极管的栅极之间，所述第二电阻的一端电性连接于所述第一电阻和所述三极管的栅极的中间点，所述第二电阻的另一端电性连接于所述三极管的集电极；所述开路检测电路还包括连接于所述开关电路和所述第一连接端之间的第三电阻；所述节点电性连接于一供电端以接入电压，所述开路检测电路还包括第四电阻，所述第四电阻电性连接于所述供电端和所述节点之间。
  14. 一种车载音响系统的扬声器开路检测方法，其特征在于，所述车载音响系统为如权利要求1至9任一项所述的车载音响系统，所述扬声器开路检测方法包括开路检测步骤，所述开路检测步骤具体包括：
    使能所述控制模块的所述输出端口，将所述开关电路导通；
    当所述控制模块的所述输入端口的信号为高电平信号，判定所述车载扬声器处于开路状态；
    当所述控制模块的所述输入端口的信号为低电平信号时，判定所述车载扬声器处于非开路状态。
  15. 根据权利要求10所述的扬声器开路检测方法，其特征在于，所述扬声器开路检测方法还包括如下步骤：初始上电时，使能所述功放处于关闭状态，所述输出端口和所述输入端口处于低电平状态。
PCT/CN2021/139480 2021-03-22 2021-12-20 一种车载音响系统及其扬声器开路检测方法 WO2022199157A1 (zh)

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