WO2019192298A1 - 控制电路、控制方法、装置、电子设备及存储介质 - Google Patents

控制电路、控制方法、装置、电子设备及存储介质 Download PDF

Info

Publication number
WO2019192298A1
WO2019192298A1 PCT/CN2019/077982 CN2019077982W WO2019192298A1 WO 2019192298 A1 WO2019192298 A1 WO 2019192298A1 CN 2019077982 W CN2019077982 W CN 2019077982W WO 2019192298 A1 WO2019192298 A1 WO 2019192298A1
Authority
WO
WIPO (PCT)
Prior art keywords
speaker
voltage
switch
circuit
coupled
Prior art date
Application number
PCT/CN2019/077982
Other languages
English (en)
French (fr)
Inventor
王会文
Original Assignee
中兴通讯股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Publication of WO2019192298A1 publication Critical patent/WO2019192298A1/zh

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage

Definitions

  • the present invention relates to, but is not limited to, electronic technology, and more particularly to a control circuit, a control method, a device, an electronic device, and a storage medium.
  • Speaker As an electroacoustic transducer, Speaker (SPK) is the core module of car audio system. In a car audio system, the speaker may have abnormal conditions such as overvoltage, short circuit, and open circuit, which may not only affect the normal operation of the speaker, but may also cause the speaker to become overheated or directly damage the speaker.
  • abnormal conditions such as overvoltage, short circuit, and open circuit, which may not only affect the normal operation of the speaker, but may also cause the speaker to become overheated or directly damage the speaker.
  • the related art vehicle speaker protection mechanism protects the speaker safety by embedding an offset detector.
  • this method is only suitable for the scene where the speaker has an abnormal offset, and is not applicable to a scene such as an overvoltage state of the speaker.
  • embodiments of the present invention are directed to providing a control circuit including: an overvoltage protection circuit including a comparator and a switch coupled to the front of the speaker and the overvoltage protection circuit Between the stages of the circuit;
  • the comparator is coupled to compare a voltage of the acquisition speaker with a received reference voltage, and when the voltage of the speaker is greater than or equal to the reference voltage, the control switch disconnects the communication line of the front stage circuit and the speaker .
  • the embodiment of the invention further provides a control method, including:
  • an enable signal is sent to the detection circuit and the voltage on the positive line of the speaker or the voltage on the negative line is read by the detection circuit to determine the state of the speaker.
  • the voltage on the positive line or the negative line of the speaker can be collected periodically or in real time according to the need to determine the state of the speaker, and the speaker fault is found in time.
  • An embodiment of the present invention further provides a control device, the device comprising: a memory, a processor, and a program stored on the memory and executable on the processor, when the program is executed by the processor Implement the above control method.
  • the embodiment of the invention further provides an electronic device comprising the above control circuit and a controller, the controller being configured to perform the above control method.
  • the embodiment of the invention further provides a computer readable storage medium storing computer executable instructions, which are implemented when the computer executable instructions are executed.
  • FIG. 1 is a schematic structural diagram of a control circuit according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of a frame of an overvoltage protection circuit according to an embodiment of the present invention.
  • FIG. 3 is a schematic circuit diagram of an overvoltage protection circuit according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a frame of a detection circuit according to an embodiment of the present invention.
  • FIG. 5 is a schematic circuit diagram of a detection circuit according to an embodiment of the present invention.
  • FIG. 6 is a structural block diagram of a car audio system according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of an overvoltage protection circuit according to an embodiment of the present invention.
  • FIG. 8 is a schematic flowchart diagram of a control method according to an embodiment of the present invention.
  • FIG. 9 is a schematic flowchart of a speaker protection and state detection method according to an embodiment of the present invention.
  • an offset detection function can be embedded in an automotive power amplifier device, and if an offset is detected, a speaker protection control signal or command is issued.
  • the offset detection protection mechanism can only protect the safety of the speaker in the case where the speaker has an abnormal offset, and can not automatically protect the speaker when the speaker is in an overvoltage state, and can not detect the short circuit and open state of the speaker.
  • the offset detection protection mechanism must require the control unit in the car audio system, such as the Microcontroller Unit (MCU), to turn on the audio power amplifier in the appropriate sequence, if the MCU does not have enough settling time to stabilize the amplifier. In the case of the amplifier directly turned on to the playback mode, the speaker protection mechanism may not work.
  • MCU Microcontroller Unit
  • each automotive electronic module is connected by a wire harness, and there may be different states on the interface of the module connector.
  • a typical car battery voltage range is 9V to 16V.
  • the nominal voltage of the car battery is 12V.
  • the battery voltage is about 14.4V.
  • the transient voltage may also reach ⁇ 100V. Excessive transient voltages can cause various electronic modules to work abnormally or even be damaged. Due to the increasing number of electronic control units inside the car, the data transmission capacity of each electronic control unit is also multiplied, which requires the car wiring harness to have better information transmission function, and then the design of the automobile wiring harness is more and more complex.
  • the wiring harness of the car is many and chaotic. In the production test process, even during the user's use, short-circuit or open circuit caused by mixed insertion, wrong insertion, or wire harness damage may damage the internal electronic module of the car, and even affect the entire vehicle circuit system, threatening driving safety.
  • an embodiment of the present invention provides a control circuit, a control method, a device, an electronic device, and a storage medium, which can protect the safety of the speaker when the speaker is in an overvoltage state, can detect the state of the speaker, and determine the fault of the speaker in time. Locate the cause of the failure.
  • control circuit includes an overvoltage protection circuit, and the overvoltage protection circuit includes a comparator and a switch, and the switch is coupled to the speaker and Between the pre-stage circuits of the overvoltage protection circuit;
  • the comparator is coupled to compare a voltage of the acquisition speaker with a received reference voltage, and when the voltage of the speaker is greater than or equal to the reference voltage, the control switch is turned off to open the front stage circuit and the speaker Communication line.
  • the front stage circuit includes a power amplifying circuit, or the like.
  • the speaker positive voltage is greater than or equal to its reference voltage or only the speaker negative voltage is greater than or equal to its reference voltage to determine whether the speaker is in an overvoltage condition.
  • the comparator includes a first comparator and a second comparator
  • the switch includes a first switch and a second switch, and an output end of the first comparator is coupled to the first switch, where The output of the second comparator is coupled to the second switch;
  • An input end of the first comparator is coupled to a positive pole of the speaker to collect a positive voltage and receive a first reference voltage, and when the positive voltage is greater than or equal to the first reference voltage, the first comparator is The first switch output disconnects the control signal;
  • the input end of the second comparator is coupled to the negative pole of the speaker to collect the negative voltage and receive the second reference voltage.
  • the second comparator is The second switch outputs an open control signal.
  • the first switch and the second switch may be initially set to an on state.
  • the control signal may be a high level or a low level, and the first switch and the second switch may be set to be in an off state when a low level is received and in an on state when a high level is received.
  • the first comparator determines that the positive voltage is greater than or equal to the first reference voltage, outputting a low level to the first switch to turn off the first switch, and when the positive voltage is less than the first reference voltage, A high level is output to the first switch to turn on the first switch.
  • the second comparator determines that the negative voltage is greater than or equal to the second reference voltage, outputting a low level to the second switch to turn off the second switch, and when the negative voltage is less than the second reference At the time of voltage, a high level is output to the second switch to turn on the second switch.
  • those skilled in the art can set different rules as needed to control the disconnection or conduction of the switch to realize the communication line for disconnecting or turning on the pre-stage circuit and the speaker. In this way, as long as either the positive or negative side of the speaker is in an overvoltage condition, the corresponding switch is turned off to protect the speaker.
  • the outputs of the first comparator and the second comparator are also respectively coupled to the controller;
  • the first comparator When the positive voltage is greater than or equal to the first reference voltage, the first comparator outputs an overvoltage identification signal to the controller;
  • the second comparator outputs an overvoltage identification signal to the controller when the negative voltage is greater than or equal to the second reference voltage.
  • the overvoltage identification signal may be active low.
  • the output of the first comparator is coupled to both the first switch and one pin of the controller, such as a general purpose input/output (GPIO) tube coupled to the MCU.
  • GPIO general purpose input/output
  • the controller determines that the speaker is in an overvoltage condition.
  • the controller which can be a microcontroller MCU (or microcontroller) of the circuit system, or a CPU, or a digital signal processor (DSP, Digital Signal Processing), or a field. Programmable Array (FPGA), etc.
  • the controller uses the controller as an example for the MCU, but it is not limited to the MCU.
  • the two comparators can report an overvoltage identification signal to the controller via an AND circuit, which can be composed of two diodes, for example, connecting the negative poles of the two diodes together and connecting to On one of the pins of the MCU, the two diodes form the AND gate.
  • One of the MCU pins can be a GPIO pin. For example, when there is no overvoltage identification signal, the GPIO is high. When any comparator outputs an overvoltage identification signal (active low), the GPIO will be pulled low. The MCU thereby captures the overvoltage identification signal.
  • the switch in order to function as a switch, can be a N-type metal oxide semiconductor (Negative channel-Metal-Oxide-Semiconductor, NMOS) tube, a P-type metal oxide semiconductor (Negative channel-Metal-Oxide-Semiconductor) A PMOS) tube or the like having a switching function can be used.
  • the comparator can be a component having a voltage comparison function such as a single-limit voltage comparator and a double-limit voltage comparator.
  • the first switch includes a first NMOS transistor
  • the second switch includes a second NMOS transistor
  • the first comparator and the second comparator are both single-limit voltage comparators as an example for detailed description:
  • the output end of the first comparator is coupled to the first NMOS transistor, one input end is coupled to the anode of the speaker to collect the positive voltage of the speaker, and the other input terminal receives the first reference voltage.
  • the first comparator When the positive voltage is greater than or equal to the first reference voltage, the first comparator outputs an open control signal to the first NMOS transistor;
  • the output end of the second comparator is coupled to the second NMOS transistor, one input end is coupled to the negative terminal of the speaker to collect the negative voltage, and the other input terminal receives the second reference voltage, when the negative voltage is greater than or equal to
  • the second comparator controls outputting an off control signal to the second NMOS transistor when the second reference voltage is applied.
  • the disconnection control signal can be active low.
  • the G-pole of the first NMOS transistor can be coupled to the output end of the first comparator, the S-pole is coupled to the front-end circuit, and the D-pole is coupled to the positive terminal of the speaker.
  • the G pole of the second NMOS transistor can be coupled to the output end of the second comparator, the S pole is coupled to the front stage circuit, and the D stage is coupled to the speaker negative pole.
  • control circuit further includes: a third switch (VT1) coupled to the switch of the overvoltage protection circuit;
  • the third switch is configured to receive a control signal and output an open control signal to the switch.
  • the switch of the overvoltage protection circuit can be disconnected or turned on by the comparator, or can be directly turned off or turned on by the controller.
  • the first switch and the second switch may be coupled to the controller through a third switch, the third switch configured to receive a control signal from the controller and to the overvoltage protection circuit
  • the switch output disconnects the control signal, disconnecting the communication line of the pre-stage circuit and the speaker.
  • the controller controls the opening of the first switch, and the control signal can be at a high level.
  • the third switch is configured to be in an on state after receiving a high level from the controller, and output a low level to the first switch to turn off the first switch.
  • the process of controlling the disconnection of the second switch by the controller is similar to the above, and will not be described again.
  • the third switch may be further configured to receive a control signal from the controller and output a conduction control signal to the switch of the overvoltage protection circuit to turn on the communication line of the pre-stage circuit and the speaker.
  • the controller controls the conduction of the first switch: the control signal may be a low level, and the third switch is configured to be in an off state after receiving a low level from the controller, and output a high level to the first switch. Turn on the first switch.
  • the process of controlling the second switch of the controller is similar to the above, and will not be described again.
  • the switch of the overvoltage protection circuit can simultaneously receive the control signal of the controller and the control signal of the comparator, and there is no control conflict between the two control signals, because the switch can receive the control signal output by the controller.
  • the line is set together with the line of the control signal outputted by the comparator, and the first switch is taken as an example as follows: when the controller outputs a low level to the first switch through the third switch, if the first comparator outputs the current High level (the speaker is not in an overvoltage state), the low level can be pulled low, the first switch still receives the low level; when the controller outputs the high level to the first switch through the third switch, if The comparator outputs low level at this time (the speaker is in an overvoltage state), the high level cannot pull low, and the first switch still receives low level.
  • the process of receiving the control signal by the second switch is similar to the above, and will not be described again.
  • the control circuit includes not only an overvoltage protection circuit but also a detection circuit;
  • the detecting circuit is respectively coupled to the power supply voltage and the positive and negative terminals of the speaker;
  • the detection circuit receives the enable signal and turns on the supply voltage and the positive terminal of the speaker based on the enable signal and grounds the negative terminal of the speaker, and outputs the voltage on the positive line of the speaker.
  • the detection circuit receives the enable signal and turns on the supply voltage and the negative terminal of the speaker based on the enable signal and grounds the anode of the speaker, and outputs the voltage on the negative line of the speaker.
  • the detection circuit can receive an enable signal from the controller and output a voltage on the positive or negative line of the speaker to the controller.
  • the detection circuit can be coupled to an analog-to-digital converter (ADC) pin of the controller to output a voltage on the positive or negative line of the speaker to the controller.
  • ADC analog-to-digital converter
  • the controller can periodically or in real time collect the voltage on the positive or negative line of the speaker to determine the state of the speaker and find the speaker fault in time.
  • the speaker status includes a short circuit, an open circuit (open circuit), and the like.
  • the controller Before performing the speaker state detection, the controller outputs a disconnection control signal to the switch in the overvoltage protection circuit through the third switch to disconnect the communication line between the speaker and the front stage circuit of the overvoltage protection circuit, The function of the isolation detection circuit and the pre-stage circuit is achieved.
  • the front stage circuit of the speaker includes a power amplifying circuit, or other circuit connected to the speaker through an overvoltage protection circuit.
  • the controller first determines whether the speaker is in an overvoltage state, and if so, does not perform the next action, that is, the switch that turns off the overvoltage protection circuit is no longer controlled, and the detection circuit is not enabled; The controller controls to open the switch of the overvoltage protection circuit and enable the detection circuit to detect the state of the speaker.
  • the pin of the controller outputting the control signal to the third switch and the pin outputting the enable signal to the detecting circuit may be the same pin or different pins.
  • the control signal and the enable signal are the same signal, such as When the signal is high, the third switch is configured to be in an on state when receiving a high level and output a low level to the switch of the overvoltage protection circuit to turn off the control signal; meanwhile, the detection circuit is configured to receive the high voltage The level is in the enabled state.
  • the control signal and the enable signal can make other settings as needed, such as setting the control signal and the enable signal to be active low.
  • the controller when the controller outputs a control signal to the third switch and the output of the enable signal to the detection circuit is not the same pin, the controller outputs a control signal to the third switch, respectively, and detects The circuit outputs an enable signal; or the controller no longer passes the third switch, but directly outputs a disable signal to the switch output of the overvoltage protection circuit through one pin, and outputs an enable signal to the detection circuit through the other pin.
  • the controller after ending the detection of the speaker state, the controller also outputs a disable signal to the detection circuit, disconnecting the line connection between the supply voltage and the positive terminal of the speaker, and disconnecting the negative terminal of the speaker.
  • the controller can also output a conduction control signal to the switch of the overvoltage protection circuit through the third switch to turn on the link between the front stage circuit and the speaker.
  • the third switch may be a component having an action of controlling the open switch, such as an NMOS transistor or a PMOS transistor.
  • the third switch (VT1) includes a sixth NMOS transistor (VT1).
  • the G pole of the sixth NMOS transistor is connected to the controller, the D pole is connected to the switch of the overvoltage protection circuit, and the S pole is grounded.
  • the detection circuit includes a voltage dividing circuit and a fourth switch (VT6);
  • the voltage dividing circuit When the detecting circuit is configured to output a voltage on the positive line of the speaker, the voltage dividing circuit is coupled between the power supply voltage and the positive and negative poles of the speaker, and the voltage dividing circuit turns on the power supply voltage when receiving the enable signal And the positive pole of the speaker and ground the negative pole of the speaker;
  • One end of the fourth switch is coupled to the positive line of the speaker, one end is coupled to the power supply voltage, and the fourth switch outputs a voltage on the positive line of the speaker when the voltage dividing circuit receives the enable signal.
  • the detection circuit includes a voltage dividing circuit and a fourth switch (VT6);
  • the detecting circuit When the detecting circuit outputs the voltage on the negative line of the speaker, the detecting circuit includes a voltage dividing circuit and a fourth switch (VT6);
  • the voltage dividing circuit is coupled between the power supply voltage and the positive and negative poles of the speaker, and the voltage dividing circuit turns on the power supply voltage and the negative pole of the speaker and grounds the positive pole of the speaker when receiving the enable signal;
  • One end of the four switch is coupled to the negative line of the speaker, and one end is coupled to the power supply voltage; and the fourth switch outputs the voltage on the negative line of the speaker when the voltage dividing circuit receives the enable signal.
  • the fourth switch can be configured to output a voltage on the positive or negative line to the controller.
  • the fourth switch can be connected to the ADC pin of the MCU, and the voltage on the SPK positive line can be read to determine the state of the SPK, such as a short circuit, an open circuit (open circuit), and the like.
  • the fourth switch comprises a fifth NMOS transistor (VT6).
  • VT6 fifth NMOS transistor
  • the G pole of the fifth NMOS transistor is connected to the power supply voltage
  • the S pole is connected to the controller
  • the D is connected to the positive circuit of the speaker.
  • the S pole can be connected to the ADC pin of the controller.
  • the detection circuit can also include a resistor (R4, R7) coupled between the fourth switch and the ADC pin. As such, the resistor constitutes an ADC conditioning circuit that causes the voltage collected by the ADC to be within the ADC sampling range.
  • the voltage dividing circuit when the detection circuit outputs a voltage on the positive line of the speaker, includes a pull-up resistor coupled between the supply voltage and the positive terminal of the speaker, and coupled between the negative terminal of the speaker and the ground.
  • a pull-down resistor, the pull-up resistor and the pull-down resistor are configured to form a voltage divider network together with the internal resistance of the speaker.
  • the voltage dividing circuit in order to function as a voltage divider, may be a component having a voltage dividing function such as an NMOS transistor, a PMOS transistor, or a resistor.
  • the fourth switch in order to function as an output voltage, may be a component having a voltage output function such as an NMOS transistor or a PMOS transistor.
  • the voltage dividing circuit further includes two PMOS transistors (VT3, VT5) coupled between the power supply voltage and the positive terminal of the speaker and respectively located on each side of the pull-up resistor, coupled to the negative pole of the speaker and a third NMOS transistor (VT4) between the pull-down resistors, the two PMOS transistors being connected in series with a fourth NMOS transistor, the fourth NMOS transistor being configured to receive an enable signal and based on the enable signal
  • the two PMOS transistors are turned on to turn on the supply voltage and the positive terminal of the speaker; the third NMOS transistor (VT4) is configured to receive an enable signal to ground the negative terminal of the speaker.
  • the third NMOS transistor and the two PMOS transistors in the voltage dividing circuit can play the role of preventing high voltage.
  • the NMOS transistor and the PMOS transistor in the above circuit may be configured with a diode.
  • the detection circuit can also be coupled to the current limiting resistors (R2, R3) on the output line of the supply voltage to function as a current limiting, and can be coupled to the capacitor for filtering.
  • the overvoltage protection circuit in the control circuit by the overvoltage protection circuit in the control circuit, the safety of the speaker can be protected when the speaker is in an overvoltage state, and the state of the speaker is detected by the detection circuit in the control circuit to find a speaker failure.
  • the embodiment of the invention further provides an overvoltage protection circuit, the overvoltage protection circuit comprising a switch and a comparator.
  • FIG. 2 is a schematic diagram of a frame of an overvoltage protection circuit according to an embodiment of the present invention. As shown in FIG. 2, the overvoltage protection circuit includes a comparator and a switch.
  • the comparator includes a first comparator and a second comparator, the switch includes a first switch and a second switch, an output of the first comparator coupled to the first switch, an output of the second comparator The end is coupled to the second switch;
  • An input end of the first comparator is coupled to a positive pole of the speaker to collect a positive voltage and receive a first reference voltage, and when the positive voltage is greater than or equal to the first reference voltage, the first comparator is The first switch output disconnects the control signal;
  • the input end of the second comparator is coupled to the negative pole of the speaker to collect the negative voltage and receive the second reference voltage.
  • the second comparator is The second switch outputs an open control signal.
  • the first switch and the second switch may be initially set to an on state.
  • the control signal may be a high level or a low level, and the first switch and the second switch may be set to be in an off state when a low level is received and in an on state when a high level is received.
  • the first comparator determines that the positive voltage is greater than or equal to the first reference voltage, outputting a low level to the first switch to turn off the first switch, and when the positive voltage is less than the first reference voltage, A high level is output to the first switch to turn on the first switch.
  • the second comparator determines that the negative voltage is greater than or equal to the second reference voltage, outputting a low level to the second switch to turn off the second switch, and when the negative voltage is less than the second reference At the time of voltage, a high level is output to the second switch to turn on the second switch.
  • those skilled in the art can set different rules as needed to control the disconnection or conduction of the switch to realize the communication line for disconnecting or turning on the pre-stage circuit and the speaker.
  • the two comparators can also report the overvoltage identification signal to the controller separately.
  • the outputs of the first comparator and the second comparator are also respectively coupled to the controller;
  • the first comparator When the positive voltage is greater than or equal to the first reference voltage, the first comparator outputs an overvoltage identification signal to the controller;
  • the second comparator outputs an overvoltage identification signal to the controller when the negative voltage is greater than or equal to the second reference voltage.
  • the overvoltage identification signal may be active low.
  • the output of the first comparator is coupled to both the first switch and one pin of the controller, such as to a certain GPIO pin of the MCU.
  • the output of the first comparator outputs a low level
  • the first switch receives a low level
  • the GPIO pin receives a low state.
  • the controller determines that the speaker is in an overvoltage condition.
  • the controller which can be a microcontroller MCU (or microcontroller) of the circuit system, or a CPU, or a digital signal processor (DSP, Digital Signal Processing), or a field. Programmable Array (FPGA), etc.
  • the controller uses the controller as an example for the MCU, but it is not limited to the MCU.
  • the two comparators can report an overvoltage identification signal to the controller via an AND circuit, which can be composed of two diodes, for example, connecting the negative poles of the two diodes together and connecting to On one of the pins of the MCU, the two diodes form the AND gate.
  • One of the MCU pins can be a GPIO pin. For example, when there is no overvoltage identification signal, the GPIO is high. When any comparator outputs an overvoltage identification signal (active low), the GPIO will be pulled low. The MCU thereby captures the overvoltage identification signal.
  • the switch in order to function as a switch, may be a component having a switching function such as an NMOS transistor or a PMOS transistor.
  • the comparator can be a component having a voltage comparison function such as a single-limit voltage comparator and a double-limit voltage comparator.
  • FIG. 3 is a schematic circuit diagram of an overvoltage protection circuit according to an embodiment of the present invention, as shown in FIG.
  • the integrated double N MOS transistor VT9 and two single limit comparators COM_1, COM_2 form an overvoltage protection circuit.
  • the supply voltages of the two single limit comparators COM_1 and COM_2 are VCC_PROT, COM_1 and COM_2.
  • the single-limit comparator reference voltages correspond to VREF1 and VREF2, respectively.
  • R10 and R11 form a conditioning network of reference voltage VREF1, so that the comparator COM_1 has a suitable reference voltage value at the non-inverting input terminal
  • R8 and R9 form a voltage dividing network of the SPK positive voltage, so that the input voltage of the comparator COM_1 inverting input terminal is in the range of the range.
  • R14 and R15 form a conditioning network with reference voltage VREF2, so that comparator COM_2 has a suitable reference voltage value at the non-inverting input, R12 and R13 form a voltage dividing network of SPK negative voltage, so that comparator COM_2 inverting input
  • the input voltage is within the range of the range.
  • the diode VD1 is connected to the negative terminal of VD2 and is connected to a GPIO pin of the MCU.
  • the pin is configured in pull-up input mode (PU mode) and is in low-level interrupt capture mode.
  • VD1 and VD2 form a AND gate.
  • the GPIO pin is high when there is no overvoltage identification signal. When any comparator outputs an overvoltage identification signal (active low), the GPIO is pulled low, and the MCU captures the overvoltage identification signal. The capacitance of this part is filtered.
  • the embodiment of the invention also provides a detection circuit.
  • 4 is a schematic diagram of a frame of a detection circuit according to an embodiment of the present invention, as shown in FIG. 4,
  • the detecting circuit is respectively coupled to the power supply voltage and the positive and negative terminals of the speaker;
  • the detection circuit receives the enable signal and turns on the supply voltage and the positive terminal of the speaker based on the enable signal and grounds the negative terminal of the speaker, and outputs the voltage on the positive line of the speaker.
  • the detection circuit receives the enable signal and turns on the supply voltage and the negative terminal of the speaker based on the enable signal and grounds the anode of the speaker, and outputs the voltage on the negative line of the speaker.
  • the detection circuit can receive an enable signal from the controller and output a voltage on the positive or negative line of the speaker to the controller.
  • the detection circuit can be coupled to the ADC pin of the controller to output the voltage on the positive or negative line of the speaker to the controller.
  • the controller can periodically or in real time collect the voltage on the positive or negative line of the speaker to determine the state of the speaker and find the speaker fault in time.
  • the speaker status includes a short circuit, an open circuit (open circuit), and the like.
  • the controller Before performing the speaker state detection, the controller outputs a disconnection control signal to the switch in the overvoltage protection circuit through the third switch to disconnect the communication line between the speaker and the front stage circuit of the overvoltage protection circuit, The function of the isolation detection circuit and the pre-stage circuit is achieved.
  • the front stage circuit of the speaker includes a power amplifying circuit, or other circuit connected to the speaker through an overvoltage protection circuit.
  • the controller first determines whether the speaker is in an overvoltage state, and if so, does not perform the next action, that is, the switch that turns off the overvoltage protection circuit is no longer controlled, and the detection circuit is not enabled; The controller controls to open the switch of the overvoltage protection circuit and enable the detection circuit to detect the state of the speaker.
  • the pin of the controller outputting the control signal to the third switch and the pin outputting the enable signal to the detecting circuit may be the same pin or different pins.
  • the control signal and the enable signal are the same signal, such as When the signal is high, the third switch is configured to be in an on state when receiving a high level and output a low level to the switch of the overvoltage protection circuit to turn off the control signal; meanwhile, the detection circuit is configured to receive the high voltage The level is in the enabled state.
  • the control signal and the enable signal can make other settings as needed, such as setting the control signal and the enable signal to be active low.
  • the controller when the controller outputs a control signal to the third switch and the output of the enable signal to the detection circuit is not the same pin, the controller outputs a control signal to the third switch, respectively, and detects The circuit outputs an enable signal.
  • the third switch may be a component having an action of controlling the open switch, such as an NMOS transistor or a PMOS transistor.
  • the third switch (VT1) includes a sixth NMOS transistor (VT1).
  • the G pole of the sixth NMOS transistor is connected to the controller, the D pole is connected to the switch of the overvoltage protection circuit, and the S pole is grounded.
  • the detection circuit includes a voltage dividing circuit and a fourth switch (VT6);
  • the voltage dividing circuit When the detecting circuit is configured to output a voltage on the positive line of the speaker, the voltage dividing circuit is coupled between the power supply voltage and the positive and negative poles of the speaker, and the voltage dividing circuit turns on the power supply voltage when receiving the enable signal And the positive pole of the speaker and ground the negative pole of the speaker;
  • One end of the fourth switch is coupled to the positive line of the speaker, one end is coupled to the power supply voltage, and the fourth switch outputs a voltage on the positive line of the speaker when the voltage dividing circuit receives the enable signal.
  • the detection circuit includes a voltage dividing circuit and a fourth switch (VT6);
  • the detecting circuit When the detecting circuit outputs the voltage on the negative line of the speaker, the detecting circuit includes a voltage dividing circuit and a fourth switch (VT6);
  • the voltage dividing circuit is coupled between the power supply voltage and the positive and negative poles of the speaker, and the voltage dividing circuit turns on the power supply voltage and the negative pole of the speaker and grounds the positive pole of the speaker when receiving the enable signal;
  • One end of the four switch is coupled to the negative line of the speaker, and one end is coupled to the power supply voltage; and the fourth switch outputs the voltage on the negative line of the speaker when the voltage dividing circuit receives the enable signal.
  • the fourth switch can be configured to output a voltage on the positive or negative line to the controller.
  • the fourth switch can be connected to the ADC pin of the MCU, and the voltage on the SPK positive line can be read to determine the state of the SPK, such as a short circuit, an open circuit (open circuit), and the like.
  • the fourth switch comprises a fifth NMOS transistor (VT6).
  • VT6 fifth NMOS transistor
  • the G pole of the fifth NMOS transistor is connected to the power supply voltage
  • the S pole is connected to the controller
  • the D is connected to the positive circuit of the speaker.
  • the S pole can be connected to the ADC pin of the controller.
  • the detection circuit can also include a resistor (R4, R7) coupled between the fourth switch and the ADC pin. As such, the resistor constitutes an ADC conditioning circuit that causes the voltage collected by the ADC to be within the ADC sampling range.
  • the voltage dividing circuit when the detection circuit outputs a voltage on the positive line of the speaker, the voltage dividing circuit includes a pull-up resistor (R6) coupled between the supply voltage and the positive terminal of the speaker, and coupled to the negative terminal of the speaker and the ground.
  • a pull-down resistor (R5) is provided, and the pull-up resistor and the pull-down resistor are configured to form a voltage dividing network together with the internal resistance of the speaker.
  • the voltage dividing circuit in order to function as a voltage divider, may be a component having a voltage dividing function such as an NMOS transistor, a PMOS transistor, or a resistor.
  • the fourth switch in order to function as an output voltage, may be a component having a voltage output function such as an NMOS transistor or a PMOS transistor.
  • the voltage dividing circuit further includes two PMOS transistors (VT3, VT5) coupled between the power supply voltage and the positive terminal of the speaker and respectively located on each side of the pull-up resistor, coupled to the negative pole of the speaker and a third NMOS transistor (VT4) between the pull-down resistors, the two PMOS transistors being connected in series with a fourth NMOS transistor, the fourth NMOS transistor being configured to receive an enable signal and based on the enable signal
  • the two PMOS transistors are turned on to turn on the supply voltage and the positive terminal of the speaker; the third NMOS transistor (VT4) is configured to receive an enable signal to ground the negative terminal of the speaker.
  • the third NMOS transistor and the two PMOS transistors in the voltage dividing circuit can play the role of preventing high voltage.
  • the NMOS transistor and the PMOS transistor in the above circuit may be configured with a diode.
  • FIG. 5 is a schematic circuit diagram of a detection circuit according to an embodiment of the present invention, as shown in FIG.
  • SPK_DET_CTL is the turn-off pin of the switch (double N MOS transistor) in the MCU control overvoltage protection circuit and also the enable pin of the Speaker state detecting circuit.
  • SPK_DET_CTL is active high.
  • MOS transistor VT1 is turned on
  • SPK_OFF_N peaker off negative terminal
  • the double N MOS transistor in the overvoltage protection circuit is turned off.
  • a voltage dividing network composed of resistors R5, R6 and SPK internal resistance is connected to the line, and the power supply voltage of the network is VCC_DEC.
  • the circuit connecting SPK_P in the voltage division network uses the combination of P MOS tube VT3 and P MOS tube VT5 to prevent overvoltage from entering the circuit from two directions, and the circuit connecting SPK_N uses N MOS tube VT2 and N MOS tube VT4 uses the parasitic body diode of the MOS tube to prevent high voltage.
  • the N MOS tube VT6 connected to the ADC pin SPK_DEC_ADC of the MCU also provides overvoltage protection for the MCU.
  • the resistors R4 and R7 form an ADC conditioning circuit to make the collected voltage in the ADC. Within the sampling range, resistors R2 and R3 act as current limiting, and the capacitance of this part acts as a filter.
  • the pull-up resistor (R5) and the pull-down resistor (R6) are connected to the positive and negative poles of the SPK, respectively, and the SPK internal resistance constitutes a voltage division network.
  • the state of the SPK is read by the ADC of the MCU reading the voltage on the SPK positive line, such as an open circuit, a short circuit state, and the like.
  • control circuit provided by the embodiment of the present invention can detect the state of overvoltage, short circuit or open circuit (open circuit) of the SPK, and protect the speaker by disconnecting the line when the SPK is in an overvoltage state.
  • the state of the speaker can be judged by the following principles, for example:
  • the overvoltage protection circuit acts and is judged to be in an overvoltage state
  • the ADC When SPK_P is shorted to ground, the ADC reads the voltage at the front end of the voltage divider network is 0, that is, the drain voltage (D pole) voltage of the N MOS transistor VT6 is 0; first set Rspk to SPK internal resistance, then SPK_N short circuit to ground, VT6 leakage
  • the pole voltage is VCC_DEC*Rspk/(Rspk+R6); when SPK_P and SPK_N are directly connected and then shorted to ground, the situation is consistent with SPK_P short to ground;
  • the VT6 drain voltage is VCC_DEC.
  • the state of the speaker can be judged by reading the VT6 drain voltage through the MCU's ADC.
  • the voltage at either end of SPK_P or SPK_N is higher than the reference voltage, it can be judged that the speaker is in an overvoltage state.
  • VCC_DEC voltage value should be lower than the car battery voltage, and the comparator input reference voltage should also be less than the car battery voltage, that is, in a 12V automotive power supply system, VCC_DEC/VREF1/VREF2 should be less than 12V, other The system and so on.
  • the overvoltage protection circuit and the detection circuit provided by the above embodiments may be combined or separately applied to an in-vehicle T-BOX (Telematics BOX), and other in-vehicle products having an audio link.
  • T-BOX Telematics BOX
  • the car audio system will be described in detail below as an example.
  • FIG. 6 is a structural block diagram of a car audio system according to an embodiment of the present invention, as shown in FIG.
  • the car audio system comprises an audio power amplifier, an overvoltage protection circuit, a detection circuit, a microprocessor (MCU), and a speaker speaker.
  • MCU microprocessor
  • the microprocessor may also be a CPU, or a unit such as a DSP or an FPGA.
  • the audio power amplifier part is responsible for amplifying the sound source.
  • the overvoltage protection circuit part the overvoltage protection circuit part:
  • FIG. 7 is a schematic structural diagram of an overvoltage protection circuit according to an embodiment of the present invention.
  • the portion is composed of two single-limit comparators and two N-MOS transistors, and two single-wire comparators.
  • the voltages on the positive and negative links of the Speaker are separately collected, and the collected voltages are compared with their respective reference voltages: when the real-time voltage is not greater than the reference voltage, the N MOS tube is turned on by default; when the real-time voltage is greater than the reference voltage, the comparison is made.
  • the device controls the N MOS to turn off and acts as an overvoltage protection.
  • the two comparators output two overvoltage identification signals, and the two overvoltage identification signals are reported to the MCU through an AND circuit composed of two diodes.
  • the two N MOS tubes are also controlled by the controller, and the two N MOS tubes are turned off during the Speaker state detection, which serves to isolate the detection circuit from the previous stage link.
  • the output end of the first comparator is coupled to the first NMOS transistor, one input end is coupled to the anode of the speaker to collect the positive voltage of the speaker, and the other input terminal receives the first reference voltage.
  • the first comparator When the positive voltage is greater than or equal to the first reference voltage, the first comparator outputs an open control signal to the first NMOS transistor;
  • the output end of the second comparator is coupled to the second NMOS transistor, one input end is coupled to the negative terminal of the speaker to collect the negative voltage, and the other input terminal receives the second reference voltage, when the negative voltage is greater than or equal to
  • the second comparator controls outputting an off control signal to the second NMOS transistor when the second reference voltage is applied.
  • the disconnection control signal can be active low.
  • the G-pole of the first NMOS transistor can be coupled to the output end of the first comparator, the S-pole is coupled to the front-end circuit, and the D-pole is coupled to the positive terminal of the speaker.
  • the G pole of the second NMOS transistor can be coupled to the output end of the second comparator, the S pole is coupled to the front stage circuit, and the D stage is coupled to the speaker negative pole.
  • the Speaker detection circuit part the Speaker detection circuit part
  • This part of the circuit has a plurality of MOS tubes.
  • the MCU reads the overvoltage protection circuit for the overvoltage identification signal: if there is an overvoltage condition, the next step is not performed; if there is no overvoltage identification signal, the dual N MOS transistor is turned off and enabled by the MCU control. Circuit. In this way, a pull-up resistor and a pull-down resistor are connected to the positive and negative electrodes of the SPK, respectively, and the SPK internal resistance constitutes a voltage dividing network. Finally, the ADC on the positive side of the SPK is read by the ADC of the MCU to interpret the SPK as an open circuit or a short circuit.
  • MCU part This part is mainly responsible for the identification of overvoltage signal, SPK detection, initial shutdown of double N MOS tube and detection circuit enable, and reading SPK is open circuit, short circuit state.
  • the Speaker part mainly converts the electrical signal sent by the preamplifier audio amplifier into an acoustic signal, and plays the sound out.
  • the embodiment of the invention further provides a control method, which is applied to a controller, which may be a microcontroller MCU (or a single chip microcomputer) of a circuit system, or a CPU, or a digital signal processor DSP, or a field programmable logic array. FPGA, etc.
  • a controller which may be a microcontroller MCU (or a single chip microcomputer) of a circuit system, or a CPU, or a digital signal processor DSP, or a field programmable logic array. FPGA, etc.
  • the following controllers use the MCU as an example, but are not limited to MCUs.
  • FIG. 8 is a schematic flowchart of a control method according to an embodiment of the present invention. As shown in FIG. 8, the control method includes:
  • Step 801 when it is required to perform speaker state detection, determine whether the speaker is in an overvoltage state
  • Step 802 When the speaker is not in an overvoltage state, send an enable signal to the detection circuit and read the voltage on the positive line of the speaker or the voltage on the negative line through the detection circuit to determine the state of the speaker.
  • the determining whether the speaker is in an overvoltage state comprises:
  • the overvoltage protection signal is actively read, and if it is read, it is judged that the speaker is in an overvoltage state, and if it is not read, it is judged that the speaker is not in an overvoltage state.
  • the overvoltage protection signal can be passively received, and the overvoltage protection signal can be actively polled.
  • the switch in the overvoltage protection circuit When the speaker is in an overvoltage state, for example, when it encounters a high voltage shock, the switch in the overvoltage protection circuit is automatically disconnected to disconnect the connection line of the power amplifier and the speaker, and the speaker is safely protected, so that the speaker immediately enters the main protection state;
  • the MCU passively receives the overvoltage identification signal or actively reads the overvoltage identification signal to determine that the speaker is in an overvoltage state, no further actions are performed, such as enabling the detection circuit.
  • the MCU enables the detection circuit only when the speaker is not in an overvoltage condition.
  • the ADC of the MCU reads the SPK voltage to determine whether the SPK is open or shorted.
  • the method before transmitting the enable signal to the detection circuit, the method further includes:
  • a control signal is output to the overvoltage protection circuit to open the switch in the overvoltage protection circuit.
  • the switch in the overvoltage protection circuit is turned off when the Speaker state detection is performed, and the detection circuit is isolated from the previous link.
  • the reading the voltage of the speaker includes reading the positive voltage of the speaker.
  • the method when the voltage on the positive line of the speaker is read by the detection circuit, the method further includes:
  • Determining the state of the speaker based on the voltage on the positive line includes:
  • Determining the state of the speaker based on the voltage on the positive line includes:
  • the state of the speaker is an open circuit, that is, SPK_P or SPK_N is not shorted to the power supply, to the ground, and the SPK is not normally connected on the lines of SPK_P and SPK_N;
  • Rspk is the internal resistance of the speaker
  • R6 is the pull-up resistor that connects the positive pole of the speaker and forms the voltage divider network together with the internal resistance of the speaker
  • R5 is the pull-down resistor that connects the negative pole of the speaker and forms the voltage divider network together with the internal resistance of the speaker.
  • FIG. 9 is a schematic flowchart of a speaker protection and state detection method according to an embodiment of the present invention, which is applied to a car audio system provided by an embodiment of the present invention. As shown in FIG. 9, the method includes:
  • step 901 the overvoltage protection circuit automatically turns off the double N MOS tube when the speaker encounters a high voltage shock.
  • the speaker when the speaker encounters a high voltage shock, it may be any one end of the speaker positive line SPK_P or the speaker negative line SPK_N or at the same time, the speaker is in an overvoltage state, the overvoltage protection circuit is activated, and the double N MOS is turned off. Tube, disconnect the line between the power amplifier and the speaker, the speaker enters the main protection state, which protects the safety of the speaker.
  • Step 902 the overvoltage protection circuit detects whether there is a high voltage on the speaker SPK, and if so, reports an overvoltage identification signal to the MCU; if not, repeats step 902.
  • the overvoltage protection circuit detects whether there is a high voltage on the speaker SPK, including: the comparator of the overvoltage protection circuit collects the positive or negative voltage of the speaker in real time and compares with the respective reference voltages. When the positive or negative voltage is greater than or equal to the respective reference voltage, that is, the speaker is in an overvoltage state (also referred to as a high voltage state), the overvoltage identification signal is reported to the MCU.
  • step 903 the MCU determines whether there is a high voltage on the SPK, and if so, ends the process; if not, executes step 904.
  • the MCU determines whether there is a high voltage on the SPK, and the MCU can passively receive the overvoltage protection signal. If it receives, it determines that there is a high voltage on the SPK. If it is not received, it determines that there is no high voltage on the SPK; it can also be an MCU active rotation training. Take the overvoltage protection signal. If it is read, it is judged that there is high voltage on SPK. If it is not read, it is judged that there is no high voltage on SPK.
  • step 904 the MCU turns off the dual MOS transistor of the overvoltage protection circuit and enables the detection circuit.
  • the double MOS transistor for closing the overvoltage protection circuit may include a pin level connected to the double MOS transistor, and outputting a low level to the double MOS transistor through an NMOS transistor to control the double N in the overvoltage protection circuit.
  • the MOS transistor is turned off.
  • the enable detection circuit can output a high level to the detection circuit, turn on the supply voltage and the positive terminal of the speaker through the detection circuit, and sample the voltage on the positive line of the speaker.
  • step 905 the ADC pin of the MCU reads the sampling voltage of the detection circuit.
  • sampling voltage is a speaker positive voltage.
  • step 906 the state of the SPK is determined according to the sampling voltage and reported.
  • the determining the state of the SPK according to the sampling voltage may include:
  • SPK_P When the sampling voltage is 0, SPK_P is short-circuited to ground, or SPK_P is directly connected to SPK_N and then short-circuited to ground.
  • SPK_P and SPK_N are short-circuited to each other; that is, SPK_P and SPK_N are directly connected together, and SPK is short-circuited;
  • the SPK When the sampling voltage is VCC_DEC, the SPK is open, that is, SPK_P or SPK_N is not shorted to the power supply, to the ground, and the SPK is not normally connected to the lines of SPK_P and SPK_N;
  • VCC_DEC is the speaker supply voltage
  • Rspk is the SPK internal resistance
  • R5 is the pull-down resistor
  • R6 is the pull-up resistor
  • the resistors R5, R6 and SPK internal resistance form a voltage divider network connected to the line.
  • step 907 the detection state is exited.
  • the exiting detection state may include: pulling down a pin level connected to the dual MOS tube, outputting a high level to the double MOS tube through an NMOS tube, and turning on the double N MOS tube in the overvoltage protection circuit.
  • the method may further include: pulling down the pin level of the detecting circuit, outputting a low level to the detecting circuit, and disconnecting the power supply voltage from the positive terminal of the speaker through the detecting circuit.
  • An embodiment of the present invention further provides a control device, the device comprising: a memory, a processor, and a program stored on the memory and executable on the processor, when the program is executed by the processor Implement the above control method.
  • the embodiment of the present invention further provides an electronic device, including the above control circuit, and a controller, the controller being configured to perform the foregoing control method provided by the embodiment of the present invention.
  • the embodiment of the present invention further provides a computer readable storage medium storing computer executable instructions.
  • the computer executable instructions When executed, the foregoing control method provided by the embodiments of the present invention is implemented.

Landscapes

  • Amplifiers (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

本发明公开了一种控制电路、控制方法、装置、电子设备及存储介质，所述控制电路包括：过压保护电路，所述过压保护电路包括比较器和开关，所述开关耦接在扬声器和所述过压保护电路的前级电路之间；所述比较器被耦接以采集扬声器的电压与接收的参考电压比较，并当所述扬声器的电压大于等于所述参考电压时，控制开关断开所述前级电路和所述扬声器的通信线路。

Description

控制电路、控制方法、装置、电子设备及存储介质
相关申请的交叉引用
本申请基于申请号为201810290854.6、申请日为2018年04月03日的中国专利申请提出，并要求该中国专利申请的优先权，该中国专利申请的全部内容在此引入本申请作为参考。
技术领域
本发明涉及但不限于电子技术，尤其涉及一种控制电路、控制方法、装置、电子设备及存储介质。
背景技术
扬声器(Speaker，SPK)作为电声转换器件，是汽车音响系统的核心模块。在汽车音响系统中，扬声器可能存在过压、短路、断路等非正常状态，如此不仅影响扬声器的正常工作，还有可能导致扬声器变得过热或者直接损坏扬声器等。
相关技术的车载Speaker保护机制，采用嵌入偏移检测器的方式保护扬声器安全，然而该方式仅适配置为扬声器存在异常偏移场景下，对于扬声器的过压状态等场景不适用。
发明内容
有鉴于此，本发明实施例期望提供一种控制电路，包括：过压保护电路，所述过压保护电路包括比较器和开关，所述开关耦接在扬声器和所述过压保护电路的前级电路之间；
所述比较器被耦接以采集扬声器的电压与接收的参考电压比较，并当所述扬声器的电压大于等于所述参考电压时，控制开关断开所述前级电路 和所述扬声器的通信线路。
上述技术方案，当扬声器处于过压状态时，通过断开前级电路和扬声器的通信线路，起到保护扬声器安全的作用。
本发明实施例还提供了一种控制方法，包括：
在需要进行扬声器状态检测时，判断扬声器是否处于过压状态；
当扬声器不处于过压状态时，向检测电路发送使能信号并通过所述检测电路读取扬声器正极线路上的电压或者负极线路上的电压，以判断扬声器的状态。
上述技术方案，可以根据需要定时或者实时采集扬声器正极线路或者负极线路上的电压，来判断扬声器的状态，及时发现扬声器故障。
本发明实施例还提供了一种控制装置，所述装置包括：存储器、处理器及存储在所述存储器上并可在所述处理器上运行的程序，所述程序被所述处理器执行时实现上述控制方法。
本发明实施例还提供了一种电子设备，包括上述控制电路以及控制器，所述控制器被配置为执行上述控制方法。
本发明实施例还提供了一种存储有计算机可执行指令的计算机可读存储介质，所述计算机可执行指令被执行时，实现上述控制方法。
附图说明
图1为本发明实施例提供的控制电路的结构示意图；
图2为本发明实施例提供的过压保护电路的框架示意图；
图3为本发明实施例提供的过压保护电路的电路示意图；
图4为本发明实施例提供的检测电路的框架示意图；
图5为本发明实施例提供的检测电路的电路示意图；
图6为本发明实施例提供的汽车音响系统的结构框图；
图7为本发明实施例中涉及的过压保护电路结构示意图；
图8为本发明实施例提供的控制方法的流程示意图；
图9为本发明实施例提供的一种扬声器保护以及状态检测方法流程示意图。
具体实施方式
为使本发明的目的、技术方案和优点更加清楚明白，下文中将结合附图对本发明的实施例进行详细说明。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互任意组合。
在附图的流程图示出的步骤可以在诸如一组计算机可执行指令的计算机系统中执行。并且，虽然在流程图中示出了逻辑顺序，但是在某些情况下，可以以不同于此处的顺序执行所示出和/或描述的步骤。
异常偏移能够将扬声器置于变得过热的风险下或者直接损坏扬声器。相关技术中，在汽车功率放大器设备中可以嵌入偏移检测功能，如果检测到偏移，则发出扬声器保护控制信号或者命令。但是，首先，偏移检测保护机制只能在扬声器存在异常偏移场景下保护扬声器的安全，而不能在扬声器处于过压状态时自动保护扬声器的安全，更不能检测扬声器的短路、断路状态。其次，偏移检测保护机制必须要求汽车音响系统中的控制单元，例如微控制单元(MCU，Microcontroller Unit)按照适当的序列开启音频功率放大器，如果MCU在没有用于使放大器稳定的足够设定时间的情况下直接将放大器开启至播放模式，扬声器保护机制可能不起作用。
并且，汽车内部电子模块和负载众多，彼此一起构成了一个复杂的电子环境。各汽车电子模块间是通过线束连接的，对于模块连接器的接口上，可能存在不同的状态。典型的汽车电池电压范围为9V至16V，发动机关闭时，汽车电池的标称电压为12V；发动机工作时，电池电压在14.4V左右。但是，不同条件下，瞬态电压也可能达到±100V。过高的瞬态电压可能使各电子模块工作异常，甚至损坏。由于汽车内部的电控单元越来越多，各 个电控单元的数据传输量也呈倍数递增，这要求汽车线束具备更为优质的信息传递功能，随即，也导致了汽车线束的设计越来越复杂。对于电器设备较多的汽车，汽车线束线多而乱。在生产测试过程中甚至在用户使用过程中，混插、错插，或者线束损坏从而引起的短路、断路都可能使汽车内部电子模块损坏，甚至会影响整车电路系统，威胁行驶安全。
基于此，本发明实施例提供了一种控制电路、控制方法、装置、电子设备及存储介质，可以在扬声器处于过压状态时保护扬声器的安全，可以检测扬声器的状态，及时确定扬声器的故障以及定位故障原因。下面结合具体的实施例详细说明本申请方案。
图1为本发明实施例提供的控制电路的结构示意图；如图1所示，该控制电路包括过压保护电路，所述过压保护电路包括比较器和开关，所述开关耦接在扬声器和所述过压保护电路的前级电路之间；
所述比较器被耦接以采集扬声器的电压与接收的参考电压比较，并当所述扬声器的电压大于等于所述参考电压时，控制开关断开以断开所述前级电路和所述扬声器的通信线路。
如此，当扬声器电压大于等于所述参考电压，即扬声器处于过压状态时，断开前级电路和扬声器的连接，起到保护扬声器安全的作用；所述前级电路包括功率放大电路，或者其他与扬声器连接的各种电路。
在一些实施例中，可以只检测扬声器正极电压是否大于等于其参考电压或者只检测扬声器负极电压是否大于等于其参考电压来判断扬声器是否处于过压状态。但是扬声器正负极都有可能存在过压，因此下面以同时检测扬声器正极以及负极为例进行详细说明：
在实际实施时，所述比较器包括第一比较器和第二比较器，所述开关包括第一开关和第二开关，所述第一比较器的输出端耦接第一开关，所述第二比较器的输出端耦接第二开关；
所述第一比较器的输入端耦接所述扬声器的正极以采集正极电压并接 收第一参考电压，当所述正极电压大于等于所述第一参考电压时，所述第一比较器向所述第一开关输出断开控制信号；
所述第二比较器的输入端耦接所述扬声器的负极以采集负极电压并接收第二参考电压，当所述负极电压大于等于所述第二参考电压时，所述第二比较器向所述第二开关输出断开控制信号。
其中，所述第一开关和所述第二开关可以初始设置为导通状态。控制信号可以为高电平或者低电平，所述第一开关和所述第二开关可以设置为在收到低电平时处于断开状态，并在接收到高电平时处于导通状态。当第一比较器判断所述正极电压大于等于所述第一参考电压时，向第一开关输出低电平以断开第一开关，并当所述正极电压小于所述第一参考电压时，向第一开关输出高电平以导通第一开关。同理，当第二比较器判断所述负极电压大于等于所述第二参考电压时，向第二开关输出低电平以断开第二开关，并当所述负极电压小于所述第二参考电压时，向第二开关输出高电平以导通第二开关。当然，本领域技术人员可以根据需要设置不同的规则，以控制开关断开或者导通，来实现断开或者接通前级电路和扬声器的通信线路。如此，只要扬声器正极或者负极任一处于过压状态时，就断开其对应的开关，起到保护扬声器安全的作用。
在一些实施例中，所述第一比较器和所述第二比较器的输出端还分别与控制器耦接；
当所述正极电压大于等于所述第一参考电压时，所述第一比较器向所述控制器输出过压识别信号；
当所述负极电压大于等于所述第二参考电压时，所述第二比较器向所述控制器输出过压识别信号。
其中，以第一比较器和第一开关为例，所述过压识别信号可以为低电平有效。所述第一比较器的输出端既耦接到第一开关，也耦接到控制器的一个管脚，比如耦接到MCU的某一通用输入/输出口(GPIO，General Purpose  Input Output)管脚上。当所述正极电压大于等于所述第一参考电压时，所述第一比较器的输出端输出低电平，该第一开关接收到低电平处于断开状态，该GPIO管脚接收到低电平，控制器判断扬声器处于过压状态。
如此，一旦扬声器处于过压状态就可以上报给控制器，该控制器可以是电路系统的微控制器MCU(或者单片机)、或者CPU、或者数字信号处理器(DSP，Digital Signal Processing)、或者现场可编程逻辑阵列(FPGA，Field－Programmable Gate Array)等。以下以控制器为MCU为例进行说明，但并不局限于MCU。
在一些实施例中，两个比较器可以经过与门电路将过压识别信号上报给控制器，所述与门电路可以由两个二极管组成，例如将两个二极管的负极连接在一起后连接到MCU的某一管脚上，该两个二极管就组成了与门电路。该MCU的某一管脚可以为GPIO管脚，例如无过压识别信号时该GPIO为高电平，任意一个比较器输出过压识别信号(低电平有效)时，GPIO均会被拉低，MCU从而捕获该过压识别信号。
在一些实施例中，为起到开关作用，开关可以为N型金属氧化物半导体(Negative channel-Metal-Oxide-Semiconductor，NMOS)管、P型金属氧化物半导体(Negative channel-Metal-Oxide-Semiconductor，PMOS)管等具有开关作用的元器件即可。为起到电压比较作用，比较器可以为单限电压比较器、双限电压比较器等具有电压比较作用的元器件即可。
以所述第一开关包括第一NMOS管，所述第二开关包括第二NMOS管，所述第一比较器和所述第二比较器均为单限电压比较器为例进行详细说明：
在实际实施时，所述第一比较器的输出端耦接至第一NMOS管，一个输入端耦接至扬声器的正极以采集扬声器的正极电压，另一个输入端接收所述第一参考电压，当所述正极电压大于等于所述第一参考电压时，所述第一比较器向第一NMOS管输出断开控制信号；
所述第二比较器的输出端耦接至第二NMOS管，一个输入端耦接至扬 声器的负极以采集负极电压，另一个输入端接收所述第二参考电压，当所述负极电压大于等于所述第二参考电压时，所述第二比较器控制向第二NMOS管输出断开控制信号。
其中，所述断开控制信号可以为低电平有效。
其中，所述第一NMOS管的G极可以耦接第一比较器的输出端，S极耦接至前级电路以及D极耦接扬声器正极。所述第二NMOS管的G极可以耦接第二比较器的输出端，S极耦接前级电路以及D级耦接扬声器负极。
在一些实施例中，该控制电路还包括：第三开关(VT1)，所述第三开关耦接所述过压保护电路的开关；
所述第三开关配置为接收控制信号并向所述开关输出断开控制信号。
所述过压保护电路的开关既可以由比较器控制断开或导通，也可以直接由控制器控制断开或导通。
在实际实施时，所述第一开关和所述第二开关可以通过第三开关与控制器耦接，所述第三开关配置为从控制器接收控制信号并向所述过压保护电路的的开关输出断开控制信号，断开所述前级电路和所述扬声器的通信线路。以控制器控制断开第一开关为例，所述控制信号可以为高电平。第三开关配置为从控制器接收高电平后处于导通状态，并向第一开关输出低电平，断开第一开关。控制器控制断开第二开关过程与上面类似，不再赘述。
在实际实施时，所述第三开关还可以配置为从控制器接收控制信号并向所述过压保护电路的开关输出导通控制信号，导通所述前级电路和所述扬声器的通信线路。以控制器控制导通第一开关为例：所述控制信号可以为低电平，第三开关配置为从控制器接收低电平后处于断开状态，并向第一开关输出高电平，导通第一开关。控制器控制导通第二开关过程与上面类似，不再赘述。
其中，所述过压保护电路的开关同时可以接收控制器的控制信号和比 较器的控制信号，这两个控制信号之间并不存在控制冲突，因为可以将开关接收控制器输出的控制信号的线路与接收比较器输出的控制信号的线路设置在一起，以第一开关为例说明如下：当控制器通过第三开关向第一开关输出低电平时，如果第一比较器此时输出的为高电平(扬声器不处于过压状态)，低电平可以拉低高电平，第一开关接收的仍然为低电平；当控制器通过第三开关向第一开关输出高电平时，如果比较器此时输出的为低电平(扬声器处于过压状态)，高电平无法拉低低电平，第一开关接收的仍然为低电平。第二开关接收控制信号的过程与上面类似，不再赘述。如图1所示，该控制电路不仅包括过压保护电路，还可以包括检测电路；
该检测电路分别与供电电压和扬声器正极和负极耦接；
所述检测电路接收使能信号并基于所述使能信号接通供电电压和扬声器的正极并使扬声器的负极接地，以及输出扬声器正极线路上的电压。或者，所述检测电路接收使能信号并基于所述使能信号接通供电电压和扬声器的负极并使扬声器的正极接地，以及输出扬声器负极线路上的电压。
在一些实施例中，检测电路可以从控制器接收使能信号，并向控制器输出扬声器正极线路或者负极线路上的电压。
在实际实施时，检测电路可以耦接控制器的模数转换器(ADC，Analog-to-Digital Converter)管脚，向控制器输出扬声器正极线路或者负极线路上的电压。如此，控制器可以根据需要定时或者实时采集扬声器正极线路或者负极线路上的电压，来判断扬声器的状态，及时发现扬声器故障。所述扬声器状态包括短路、断路(开路)等。
在进行扬声器状态检测之前，控制器通过第三开关向所述过压保护电路中的开关输出断开控制信号，以断开扬声器和所述过压保护电路的前级电路之间的通信线路，达到隔离检测电路与前级电路的作用。所述扬声器的前级电路包括功率放大电路，或者其他通过过压保护电路与扬声器连接的电路。
在实际实施时，控制器首先判断扬声器是否处于过压状态，如果处于，则不进行下一步动作，即不再控制关断所述过压保护电路的开关也不使能检测电路；如果不处于，则控制器控制断开过压保护电路的开关并使能检测电路，以检测扬声器的状态。
在一些实施例中，控制器向第三开关输出控制信号的管脚和向检测电路输出使能信号的管脚可以为同一个管脚，也可以是不同的管脚。
在实际实施时，当控制器向第三开关输出控制信号的管脚和向检测电路输出使能信号的管脚为同一个管脚时，该控制信号和该使能信号是同一个信号，比如，该信号为高电平时，第三开关被配置为接收高电平时处于导通状态并向过压保护电路的开关输出低电平即断开控制信号；同时，检测电路被配置为接收高电平处于使能状态。本领域技术人员可以根据需要进行其他设置，比如将控制信号和使能信号设置为低电平有效。
在实际实施时，当控制器向第三开关输出控制信号的管脚和向检测电路输出使能信号的管脚不是同一个管脚时，控制器分别向第三开关输出控制信号，并向检测电路输出使能信号；或者控制器不再通过第三开关，而是通过一个管脚直接向过压保护电路的开关输出断开控制信号，并通过另一个管脚并向检测电路输出使能信号。
在一些实施例中，结束检测扬声器状态后，控制器还向检测电路输出禁用信号，断开供电电压和扬声器正极之间的线路连接并断开扬声器负极接地。结束检测扬声器状态后，控制器还可以通过第三开关向过压保护电路的开关输出导通控制信号，导通前级电路和扬声器的链接。
为起到控制断开过压保护电路中开关的作用，第三开关可以为NMOS管、PMOS管等具有控制断开开关作用的元器件即可。
在实际实施时，所述第三开关(VT1)包括第六NMOS管(VT1)。其中，所述第六NMOS管的G极接控制器，D极接所述过压保护电路的开关，S极接地。
在一些实施例中，所述检测电路包括分压电路和第四开关(VT6)；
当检测电路配置为输出扬声器正极线路上的电压时，所述分压电路耦接在供电电压和扬声器的正极和负极之间，所述分压电路接收到所述使能信号时接通供电电压和扬声器的正极并使扬声器的负极接地；
所述第四开关一端耦接在扬声器正极线路上，一端耦接供电电压，所述第四开关在所述分压电路接收到所述使能信号时输出扬声器正极线路上的电压。
在一些实施例中，所述检测电路包括分压电路和第四开关(VT6)；
当检测电路输出扬声器负极线路上的电压时，所述检测电路包括分压电路和第四开关(VT6)；
所述分压电路耦接在供电电压和扬声器的正极和负极之间，所述分压电路接收到所述使能信号时接通供电电压和扬声器的负极并使扬声器的正极接地；所述第四开关一端耦接在扬声器负极线路上、一端耦接供电电压；，所述第四开关在所述分压电路接收到所述使能信号时输出扬声器负极线路上的电压。
在一些实施例中，第四开关可以配置为向控制器输出正极线路或者负极线路上的电压。例如，可以由MCU的ADC管脚连接第四开关，读取SPK正极线路上的电压来判断SPK的状态，例如短路、断路(开路)等。
在一些实施例中，所述第四开关包括第五NMOS管(VT6)。在实际实施时，第五NMOS管的G极接供电电压，S极接控制器，D接扬声器的正极线路。其中S极可以接控制器的ADC管脚。所述检测电路还可以包括耦接在所述第四开关和所述ADC管脚之间的电阻(R4、R7)。如此，该电阻构成ADC调理电路，使ADC采集的电压在ADC采样量程之内。
在一些实施例中，当检测电路输出扬声器正极线路上的电压时，所述分压电路包括耦接在供电电压和扬声器正极之间的上拉电阻，以及耦接在扬声器负极和接地之间的下拉电阻，所述上拉电阻和所述下拉电阻配置为 与扬声器内阻共同组成分压网络。
在一些实施例中，为起到分压作用，所述分压电路可以为NMOS管、PMOS管、电阻等具有分压作用的元器件即可。为起到输出电压的作用，第四开关可以为NMOS管、PMOS管等具有电压输出作用的元器件即可。
在实际实施时，所述分压电路还包括耦接在供电电压和扬声器正极之间且分别位于所述上拉电阻各一侧的两个PMOS管(VT3、VT5)，耦接在扬声器负极和所述下拉电阻之间的第三NMOS管(VT4)，所述两个PMOS管并联后还与第四NMOS管串联，所述第四NMOS管配置为接收使能信号并基于所述使能信号导通所述两个PMOS管以接通供电电压和扬声器的正极；所述第三NMOS管(VT4)配置为接收使能信号以使扬声器的负极接地。
其中，分压电路中的第三NMOS管和两个PMOS管都可以起到防高压的作用。
上述电路中的NMOS管和PMOS管都可以配置有二极管。
在一些实施例中，该检测电路还可以在供电电压的输出线路上耦接限流电阻(R2、R3)以起限流作用，以及可以耦接电容以起滤波作用。
本实施例中，通过控制电路中的过压保护电路，可以在扬声器处于过压状态时保护扬声器的安全，通过控制电路中的检测电路检测扬声器的状态，以发现扬声器故障。
下面分别以过压保护电路以及检测电路为例详细说明本申请方案。
本发明实施例还提供了一种过压保护电路，所述过压保护电路包括开关和比较器。
图2为本发明实施例提供的一种过压保护电路的框架示意图，如图2所示，所述过压保护电路包括比较器和开关。
所述比较器包括第一比较器和第二比较器，所述开关包括第一开关和第二开关，所述第一比较器的输出端耦接第一开关，所述第二比较器的输 出端耦接第二开关；
所述第一比较器的输入端耦接所述扬声器的正极以采集正极电压并接收第一参考电压，当所述正极电压大于等于所述第一参考电压时，所述第一比较器向所述第一开关输出断开控制信号；
所述第二比较器的输入端耦接所述扬声器的负极以采集负极电压并接收第二参考电压，当所述负极电压大于等于所述第二参考电压时，所述第二比较器向所述第二开关输出断开控制信号。
在实际实施时，所述第一开关和所述第二开关可以初始设置为导通状态。控制信号可以为高电平或者低电平，所述第一开关和所述第二开关可以设置为在收到低电平时处于断开状态，并在接收到高电平时处于导通状态。当第一比较器判断所述正极电压大于等于所述第一参考电压时，向第一开关输出低电平以断开第一开关，并当所述正极电压小于所述第一参考电压时，向第一开关输出高电平以导通第一开关。同理，当第二比较器判断所述负极电压大于等于所述第二参考电压时，向第二开关输出低电平以断开第二开关，并当所述负极电压小于所述第二参考电压时，向第二开关输出高电平以导通第二开关。当然，本领域技术人员可以根据需要设置不同的规则，以控制开关断开或者导通，来实现断开或者接通前级电路和扬声器的通信线路。
如此，只要扬声器正极或者负极任一处于过压状态时，就断开其对应的开关，起到保护扬声器安全的作用。
同时，在过压瞬间，两个比较器还可以分别向控制器上报过压识别信号。
在一些实施例中，所述第一比较器和所述第二比较器的输出端还可以分别与控制器耦接；
当所述正极电压大于等于所述第一参考电压时，所述第一比较器向所述控制器输出过压识别信号；
当所述负极电压大于等于所述第二参考电压时，所述第二比较器向所述控制器输出过压识别信号。
其中，以第一比较器和第一开关为例，所述过压识别信号可以为低电平有效。所述第一比较器的输出端既耦接到第一开关，也耦接到控制器的一个管脚，比如耦接到MCU的某一GPIO管脚上。当所述正极电压大于等于所述第一参考电压时，所述第一比较器的输出端输出低电平，该第一开关接收到低电平处于断开状态，该GPIO管脚接收到低电平，控制器判断扬声器处于过压状态。
如此，一旦扬声器处于过压状态就可以上报给控制器，该控制器可以是电路系统的微控制器MCU(或者单片机)、或者CPU、或者数字信号处理器(DSP，Digital Signal Processing)、或者现场可编程逻辑阵列(FPGA，Field－Programmable Gate Array)等。以下以控制器为MCU为例进行说明，但并不局限于MCU。
在一些实施例中，两个比较器可以经过与门电路将过压识别信号上报给控制器，所述与门电路可以由两个二极管组成，例如将两个二极管的负极连接在一起后连接到MCU的某一管脚上，该两个二极管就组成了与门电路。该MCU的某一管脚可以为GPIO管脚，例如无过压识别信号时该GPIO为高电平，任意一个比较器输出过压识别信号(低电平有效)时，GPIO均会被拉低，MCU从而捕获该过压识别信号。
在一些实施例中，为起到开关作用，开关可以为NMOS管、PMOS管等具有开关作用的元器件即可。为起到电压比较作用，比较器可以为单限电压比较器、双限电压比较器等具有电压比较作用的元器件即可。
图3为本发明实施例提供的过压保护电路的电路示意图，如图3所示，
在实际实施时，由集成的双N MOS管VT9和两个单限比较器COM_1、COM_2组成过压保护电路，两个单限比较器COM_1、COM_2的供电电压均为VCC_PROT，COM_1、COM_2两个单限比较器参考电压分别对应 VREF1、VREF2。R10与R11构成参考电压VREF1的调理网络，使比较器COM_1同相输入端有适合的参考电压值，R8与R9构成SPK正极电压的分压网络，使比较器COM_1反相输入端输入电压在量程范围内；同理，R14与R15构成参考电压VREF2的调理网络，使比较器COM_2同相输入端有适合的参考电压值，R12与R13构成SPK负极电压的分压网络，使比较器COM_2反相输入端输入电压在量程范围内。二极管VD1与VD2负极连接在一起后连接到MCU的某一GPIO管脚上，该管脚配置成上拉输入模式(PU模式)且为低电平中断捕获模式，那么VD1与VD2就组成与门电路，无过压识别信号时该GPIO管脚为高电平，任意一个比较器输出过压识别信号(低电平有效)时，GPIO均会被拉低，MCU从而捕获该过压识别信号。该部分的电容均起滤波作用。
本发明实施例还提供了一种检测电路。图4为本发明实施例提供的检测电路的框架示意图，如图4所示，
该检测电路分别与供电电压和扬声器正极和负极耦接；
所述检测电路接收使能信号并基于所述使能信号接通供电电压和扬声器的正极并使扬声器的负极接地，以及输出扬声器正极线路上的电压。
或者，所述检测电路接收使能信号并基于所述使能信号接通供电电压和扬声器的负极并使扬声器的正极接地，以及输出扬声器负极线路上的电压。
在一些实施例中，检测电路可以从控制器接收使能信号，并向控制器输出扬声器正极线路或者负极线路上的电压。
在实际实施时，检测电路可以耦接控制器的ADC管脚，向控制器输出扬声器正极线路或者负极线路上的电压。如此，控制器可以根据需要定时或者实时采集扬声器正极线路或者负极线路上的电压，来判断扬声器的状态，及时发现扬声器故障。所述扬声器状态包括短路、断路(开路)等。
在进行扬声器状态检测之前，控制器通过第三开关向所述过压保护电 路中的开关输出断开控制信号，以断开扬声器和所述过压保护电路的前级电路之间的通信线路，达到隔离检测电路与前级电路的作用。所述扬声器的前级电路包括功率放大电路，或者其他通过过压保护电路与扬声器连接的电路。
在实际实施时，控制器首先判断扬声器是否处于过压状态，如果处于，则不进行下一步动作，即不再控制关断所述过压保护电路的开关也不使能检测电路；如果不处于，则控制器控制断开过压保护电路的开关并使能检测电路，以检测扬声器的状态。
在一些实施例中，控制器向第三开关输出控制信号的管脚和向检测电路输出使能信号的管脚可以为同一个管脚，也可以是不同的管脚。
在实际实施时，当控制器向第三开关输出控制信号的管脚和向检测电路输出使能信号的管脚为同一个管脚时，该控制信号和该使能信号是同一个信号，比如，该信号为高电平时，第三开关被配置为接收高电平时处于导通状态并向过压保护电路的开关输出低电平即断开控制信号；同时，检测电路被配置为接收高电平处于使能状态。本领域技术人员可以根据需要进行其他设置，比如将控制信号和使能信号设置为低电平有效。
在实际实施时，当控制器向第三开关输出控制信号的管脚和向检测电路输出使能信号的管脚不是同一个管脚时，控制器分别向第三开关输出控制信号，并向检测电路输出使能信号。
为起到控制断开过压保护电路中开关的作用，第三开关可以为NMOS管、PMOS管等具有控制断开开关作用的元器件即可。
在实际实施时，所述第三开关(VT1)包括第六NMOS管(VT1)。其中，所述第六NMOS管的G极接控制器，D极接所述过压保护电路的开关，S极接地。
在一些实施例中，所述检测电路包括分压电路和第四开关(VT6)；
当检测电路配置为输出扬声器正极线路上的电压时，所述分压电路耦 接在供电电压和扬声器的正极和负极之间，所述分压电路接收到所述使能信号时接通供电电压和扬声器的正极并使扬声器的负极接地；
所述第四开关一端耦接在扬声器正极线路上，一端耦接供电电压，所述第四开关在所述分压电路接收到所述使能信号时输出扬声器正极线路上的电压。
在一些实施例中，所述检测电路包括分压电路和第四开关(VT6)；
当检测电路输出扬声器负极线路上的电压时，所述检测电路包括分压电路和第四开关(VT6)；
所述分压电路耦接在供电电压和扬声器的正极和负极之间，所述分压电路接收到所述使能信号时接通供电电压和扬声器的负极并使扬声器的正极接地；所述第四开关一端耦接在扬声器负极线路上、一端耦接供电电压；，所述第四开关在所述分压电路接收到所述使能信号时输出扬声器负极线路上的电压。
在一些实施例中，第四开关可以配置为向控制器输出正极线路或者负极线路上的电压。例如，可以由MCU的ADC管脚连接第四开关，读取SPK正极线路上的电压来判断SPK的状态，例如短路、断路(开路)等。
在一些实施例中，所述第四开关包括第五NMOS管(VT6)。在实际实施时，第五NMOS管的G极接供电电压，S极接控制器，D接扬声器的正极线路。其中S极可以接控制器的ADC管脚。所述检测电路还可以包括耦接在所述第四开关和所述ADC管脚之间的电阻(R4、R7)。如此，该电阻构成ADC调理电路，使ADC采集的电压在ADC采样量程之内。
在一些实施例中，当检测电路输出扬声器正极线路上的电压时，所述分压电路包括耦接在供电电压和扬声器正极之间的上拉电阻(R6)，以及耦接在扬声器负极和接地之间的下拉电阻(R5)，所述上拉电阻和所述下拉电阻配置为与扬声器内阻共同组成分压网络。
在一些实施例中，为起到分压作用，所述分压电路可以为NMOS管、 PMOS管、电阻等具有分压作用的元器件即可。为起到输出电压的作用，第四开关可以为NMOS管、PMOS管等具有电压输出作用的元器件即可。
在实际实施时，所述分压电路还包括耦接在供电电压和扬声器正极之间且分别位于所述上拉电阻各一侧的两个PMOS管(VT3、VT5)，耦接在扬声器负极和所述下拉电阻之间的第三NMOS管(VT4)，所述两个PMOS管并联后还与第四NMOS管串联，所述第四NMOS管配置为接收使能信号并基于所述使能信号导通所述两个PMOS管以接通供电电压和扬声器的正极；所述第三NMOS管(VT4)配置为接收使能信号以使扬声器的负极接地。
其中，分压电路中的第三NMOS管和两个PMOS管都可以起到防高压的作用。
上述电路中的NMOS管和PMOS管都可以配置有二极管。
图5为本发明实施例提供的检测电路的电路示意图，如图5所示，
本实施例中，SPK_DET_CTL是MCU控制过压保护电路中开关(双N MOS管)的关断管脚也是Speaker状态检测电路的使能管脚。SPK_DET_CTL高电平有效，当SPK_DET_CTL为高时，MOS管VT1导通，SPK_OFF_N(扬声器关断负端)为低，过压保护电路中的双N MOS管关断。同时，电阻R5、R6与SPK内阻构成的分压网络连接到了线路上，该网络的供电电压为VCC_DEC。在该分压网络中连接SPK_P的电路之所以采用P MOS管VT3与P MOS管VT5的组合是为防止过压从两个方向进入电路，以及连接SPK_N的电路采用N MOS管VT2和N MOS管VT4都是利用MOS管的寄生体二极管来防高压，与MCU的ADC管脚SPK_DEC_ADC相连的N MOS管VT6也为MCU提供过压保护，电阻R4与R7构成ADC调理电路，使采集的电压在ADC采样量程之内，电阻R2与R3起限流作用，该部分的电容均起滤波作用。
如此，在SPK正负极分别连接上拉电阻(R5)和下拉电阻(R6)，与 SPK内阻构成分压网络。通过MCU的ADC读取SPK正极线路上的电压来判读SPK的状态，例如开路、短路状态等。
综上所述，本发明实施例提供的控制电路可以对SPK的过压、短路或者开路(断路)等状态进行检测，并当SPK处于过压状态时，通过断开线路保护扬声器的安全。
其中，可以通过如下原则判断扬声器的状态，例如：
当SPK_P或SPK_N任意一端或同时对电源短路时，过压保护电路起作用，判定为过压状态；
当SPK_P对地短路时，ADC读取分压网络前端电压为0，即N MOS管VT6漏极(D极)电压为0；先设Rspk为SPK内阻，则SPK_N对地短路时，VT6漏极电压为VCC_DEC*Rspk/(Rspk+R6)；当SPK_P与SPK_N直接连接在一起然后对地短路时，情况与SPK_P对地短路一致；
当SPK_P与SPK_N互短时，即SPK_P与SPK_N直接连接在一起，SPK被短路掉，此时VT6漏极电压为VCC_DEC*R5/(R5+R6)；
当SPK断路，即SPK_P或SPK_N未对电源、对地短路且SPK没有正常连接在SPK_P与SPK_N的线路上，此时VT6漏极电压为VCC_DEC。
如此通过MCU的ADC通过读取VT6漏极电压就可以判断扬声器的状态。当SPK_P或SPK_N任意一端电压高于参考电压，就可以判断扬声器处于过压状态。
另外，在实际应用中，VCC_DEC电压值应该低于汽车电电池电压，比较器的输入参考电压也应该小于汽车电电池电压，即在12V汽车供电系统中，VCC_DEC/VREF1/VREF2应小于12V，其他系统以此类推。
上述实施例提供的过压保护电路以及检测电路可以组合或者单独应用于车载T-BOX(Telematics BOX)、以及具有音频链路的其他车载产品中。下面以汽车音响系统为例进行详细说明。
图6为本发明实施例提供的汽车音响系统的结构框图，如图6所示：
本实施例中，该汽车音响系统包括音频功放、过压保护电路、检测电路、微处理器(Microcontroller Unit，MCU)及扬声器Speaker构成。
该微处理器(Microcontroller Unit，MCU)也可以是CPU、或者DSP、或者FPGA等单元。
其中，音频功放部分，负责对音源进行放大。
其中，过压保护电路部分：
可以参考图7，图7为本发明实施例中涉及的过压保护电路结构示意图，如图7所示，该部分由两个单限比较器和两个N MOS管组成，两个单线比较器分别采集Speaker正极、负极链路上的电压，将采集到的电压时实与各自的参考电压进行比较：当实时电压不大于参考电压时，N MOS管默认打开；当实时电压大于参考电压时比较器控制N MOS关断，起到过压保护的作用。同时，在过压瞬间，两个比较器输出两个过压识别信号，两个过压识别信号经过由两个二极管组成的与门电路，上报给MCU。同时，两个N MOS管还要被控制器控制，在进行Speaker状态检测时关断两个N MOS管，起到检测电路与前级链路隔离的作用。
在实际实施时，所述第一比较器的输出端耦接至第一NMOS管，一个输入端耦接至扬声器的正极以采集扬声器的正极电压，另一个输入端接收所述第一参考电压，当所述正极电压大于等于所述第一参考电压时，所述第一比较器向第一NMOS管输出断开控制信号；
所述第二比较器的输出端耦接至第二NMOS管，一个输入端耦接至扬声器的负极以采集负极电压，另一个输入端接收所述第二参考电压，当所述负极电压大于等于所述第二参考电压时，所述第二比较器控制向第二NMOS管输出断开控制信号。其中，所述断开控制信号可以为低电平有效。
其中，所述第一NMOS管的G极可以耦接第一比较器的输出端，S极耦接至前级电路以及D极耦接扬声器正极。所述第二NMOS管的G极可以耦接第二比较器的输出端，S极耦接前级电路以及D级耦接扬声器负极。
其中，Speaker检测电路部分：
该部分电路有多个MOS管组成。首先MCU读取过压保护电路有无过压识别信号：若有则存在过压状态，不进行下一步动作；若无过压识别信号，则通过MCU控制关断双N MOS管并使能检测电路。这样，在SPK正负极分别连接上拉电阻和下拉电阻，与SPK内阻构成分压网络。最后通过MCU的ADC读取SPK正极上的电压来判读SPK是开路、短路状态。
其中，MCU部分：该部分主要负责过压信号的识别、SPK检测初始关断双N MOS管和检测电路使能，以及读取SPK是开路、短路状态的功能。
其中，Speaker部分：主要是将前级音频功放发来的电信号转化为声信号，将声音播放出去。
本发明实施例还提供了一种控制方法，应用于控制器，该控制器可以是电路系统的微控制器MCU(或者单片机)、或者CPU、或者数字信号处理器DSP、或者现场可编程逻辑阵列FPGA等。以下控制器以MCU为例，但并不局限于MCU
图8为本发明实施例提供的控制方法的流程示意图，如图8所示，该控制方法，包括：
步骤801，在需要进行扬声器状态检测时，判断扬声器是否处于过压状态；
步骤802，当扬声器不处于过压状态时，向检测电路发送使能信号并通过所述检测电路读取扬声器正极线路上的电压或者负极线路上的电压，以判断扬声器的状态。
在一些实施例中，所述判断扬声器是否处于过压状态，包括：
判断是否收到过压识别信号，如果收到，则判断扬声器处于过压状态，如果没有收到，则判断扬声器不处于过压状态；
或者，主动读取过压保护信号，如果读取到，则判断扬声器处于过压状态，如果没有读取到，则判断扬声器不处于过压状态。
其中，可以被动接收过压保护信号，也可以主动轮询读取过压保护信号。
当扬声器处于过压状态时，例如遭遇高压冲击时，会自动断开过压保护电路中的开关，以断开功放和扬声器的连接线路，保护扬声器安全，使扬声器立刻进入主保护状态；此时，MCU被动接受到过压识别信号或者主动读取到过压识别信号，判断出扬声器处于过压状态，则不再进行后续动作，例如使能检测电路。
只有扬声器不处于过压状态时，MCU才使能检测电路，通过MCU的ADC读取SPK的电压来判读SPK是开路或短路等状态。
在一些实施例中，在向检测电路发送使能信号之前，该方法还包括：
向过压保护电路输出控制信号以断开过压保护电路中的开关。
如此，在进行Speaker状态检测时关断过压保护电路中的开关，起到检测电路与前级链路隔离的作用。
在一些实施例中，所述读取扬声器的电压，包括读取扬声器的正极电压。
在一些实施例中，当通过所述检测电路读取扬声器正极线路上的电压时，该方法还包括：
根据所述正极线路上的电压判断扬声器的状态，包括：
根据所述正极线路上的电压判断扬声器的状态，包括：
当所述正极线路上的电压为零时，扬声器的状态为扬声器的正极线路SPK_P对地短路；
当所述正极线路上的电压为VCC_DEC*Rspk/(Rspk+R6)时，扬声器的状态为扬声器的负极线路SPK_N对地短路，或者SPK_P与SPK_N直接连接在一起对地短路；
当所述正极线路上的电压为VCC_DEC*R5/(R5+R6)时，扬声器的状态为SPK_P与SPK_N互短；
当所述正极线路上的电压为扬声器的供电电压VCC_DEC，扬声器的状态为断路，即SPK_P或SPK_N未对电源、对地短路且SPK没有正常连接在SPK_P与SPK_N的线路上；
其中，Rspk为扬声器内阻，R6为连接扬声器正极并与扬声器内阻一起构成分压网络的上拉电阻，R5为连接扬声器负极并与扬声器内阻一起构成分压网络的下拉电阻。
图9为本发明实施例提供的一种扬声器保护以及状态检测方法流程示意图，应用于本发明实施例提供的汽车音响系统。如图9所示，该方法包括：
步骤901，在扬声器遭遇高压冲击时，过压保护电路自动关断双N MOS管。
其中，在扬声器遭遇高压冲击时，可以为扬声器正极线路SPK_P或扬声器负极线路SPK_N任意一端或同时对电源短路时，此时判定扬声器处于过压状态，过压保护电路起作用，关断双N MOS管，断开功率放大器和扬声器之间的线路，扬声器进入主保护状态，保护了扬声器的安全。
步骤902，过压保护电路检测扬声器SPK上是否有高压，如果有，则向MCU上报过压识别信号；如果没有，重复步骤902。
其中，述过压保护电路检测扬声器SPK上是否有高压，包括：过压保护电路的比较器实时采集扬声器正极或者负极电压并与各自的参考电压比较。当正极或者负极电压大于等于各自的参考电压时，即扬声器处于过压状态(也可以称为高压状态)，向MCU上报过压识别信号。
步骤903，MCU判断SPK上是否有高压，如果有，结束流程；如果没有则执行步骤904。
其中，所述MCU判断SPK上是否有高压，可以是MCU被动接收过压保护信号，如果接收到则判断SPK上有高压，如果没有接收到则判断SPK上没有高压；也可以是MCU主动轮训读取过压保护信号，如果读取到则判 断SPK上有高压，如果没有读取到则判断SPK上没有高压。
步骤904，MCU关闭过压保护电路的双MOS管，并使能检测电路。
其中所述关闭过压保护电路的双MOS管，可以包括拉高与双MOS管连接的管脚电平，通过一个NMOS管向双MOS管输出低电平，控制过压保护电路中的双N MOS管关断。
所述使能检测电路，可以向检测电路输出高电平，通过检测电路接通供电电压和扬声器正极，并采样扬声器的正极线路上的电压。
步骤905，MCU的ADC管脚读取检测电路的采样电压。
其中所述采样电压为扬声器正极电压。
步骤906，根据采样电压判断SPK的状态并上报。
所述根据采样电压判断SPK的状态可以包括：
当采样电压为0时，SPK_P对地短路，或者SPK_P与SPK_N直接连接在一起然后对地短路，
当采样电压为VCC_DEC*Rspk/(Rspk+R6)时，SPK_N对地短路；
当采样电压为VCC_DEC*R5/(R5+R6)时，SPK_P与SPK_N互相短路；即SPK_P与SPK_N直接连接在一起，SPK被短路掉；
当采样电压为VCC_DEC时，SPK断路，即SPK_P或SPK_N未对电源、对地短路且SPK没有正常连接在SPK_P与SPK_N的线路上；
其中，VCC_DEC为扬声器供电电压，Rspk为SPK内阻，R5为下拉电阻，R6为上拉电阻，电阻R5、R6与SPK内阻构成分压网络连接到线路上。
步骤907，退出检测状态。
其中，退出检测状态可以包括：可以包括拉低与双MOS管连接的管脚电平，通过一个NMOS管向双MOS管输出高电平，过压保护电路中的双N MOS管导通。还可以包括：拉低与检测电路的管脚电平，向检测电路输出低电平，通过检测电路断开供电电压和扬声器正极的连接。
本发明实施例还提供了一种控制装置，所述装置包括：存储器、处理 器及存储在所述存储器上并可在所述处理器上运行的程序，所述程序被所述处理器执行时实现上述控制方法。
本发明实施例还提供了一种电子设备，包括上述控制电路，还包括控制器，所述控制器被配置为执行本发明实施例提供的上述控制方法。
本发明实施例还提供了一种存储有计算机可执行指令的计算机可读存储介质，所述计算机可执行指令被执行时，实现本发明实施例提供的上述控制方法。
虽然本发明所揭露的实施方式如上，但所述的内容仅为便于理解本发明而采用的实施方式，并非用以限定本发明。任何本发明所属领域内的技术人员，在不脱离本发明所揭露的精神和范围的前提下，可以在实施的形式及细节上进行任何的修改与变化，但本发明的专利保护范围，仍须以所附的权利要求书所界定的范围为准。

Claims (19)

  1. 一种控制电路，该控制电路包括：过压保护电路，所述过压保护电路包括比较器和开关，所述开关耦接在扬声器和所述过压保护电路的前级电路之间；
    所述比较器被耦接以采集扬声器的电压与接收的参考电压比较，并当所述扬声器的电压大于等于所述参考电压时，控制开关断开所述前级电路和所述扬声器的通信线路。
  2. 根据权利要求1所述的控制电路，其中，
    所述比较器包括第一比较器和第二比较器，所述开关包括第一开关和第二开关，所述第一比较器的输出端耦接第一开关，所述第二比较器的输出端耦接第二开关；
    所述第一比较器的输入端耦接所述扬声器的正极以采集正极电压并接收第一参考电压，当所述正极电压大于等于所述第一参考电压时，所述第一比较器向所述第一开关输出断开控制信号；
    所述第二比较器的输入端耦接所述扬声器的负极以采集负极电压并接收第二参考电压，当所述负极电压大于等于所述第二参考电压时，所述第二比较器向所述第二开关输出断开控制信号。
  3. 根据权利要求2所述的控制电路，其中，
    所述第一比较器和所述第二比较器的输出端还配置为与控制器耦接；
    当所述正极电压大于等于所述第一参考电压时，所述第一比较器向所述控制器输出过压识别信号；
    当所述负极电压大于等于所述第二参考电压时，所述第二比较器向所述控制器输出过压识别信号。
  4. 根据权利要求2所述的控制电路，其中，
    所述第一开关和所述第二开关与控制器耦接，并基于控制器发送的控 制信号，断开所述前级电路和所述扬声器的通信线路。
  5. 根据权利要求2所述的控制电路，其中，所述第一开关包括第一N型金属氧化物半导体NMOS管，所述第二开关包括第二NMOS管，所述第一比较器和所述第二比较器均为单限电压比较器；
    其中，所述第一比较器的输出端耦接至第一NMOS管，反相输入端耦接至扬声器的正极以采集扬声器的正极电压，同相输入端接收所述第一参考电压，当所述正极电压大于等于所述第一参考电压时，所述第一比较器向第一NMOS管输出断开控制信号；
    所述第二比较器的输出端耦接至第二NMOS管，反相输入端耦接至扬声器的负极以采集负极电压，同相输入端接收所述第二参考电压，当所述负极电压大于等于所述第二参考电压时，所述第二比较器控制向第二NMOS管输出断开控制信号。
  6. 根据权利要求1所述的控制电路，其中，该控制电路还包括：检测电路；
    所述检测电路分别与供电电压和扬声器的正极和负极耦接；
    所述检测电路接收使能信号并基于所述使能信号接通供电电压和扬声器的正极并使扬声器的负极接地，以及输出扬声器正极线路上的电压；或者，接收使能信号并基于所述使能信号接通供电电压和扬声器的负极并使扬声器的正极接地，以及输出扬声器负极线路上的电压。
  7. 根据权利要求6所述的控制电路，其中，该控制电路还包括：第三开关，所述第三开关耦接所述过压保护电路的开关；
    所述第三开关配置为接收控制信号并向所述开关输出断开控制信号。
  8. 根据权利要求7所述的控制电路，其中，
    所述第三开关包括第六NMOS管。
  9. 根据权利要求6所述的控制电路，其中，
    当检测电路输出扬声器正极线路上的电压时，所述检测电路包括分压 电路和第四开关；
    所述分压电路耦接在供电电压和扬声器的正极和负极之间，所述分压电路接收到所述使能信号时接通供电电压和扬声器的正极并使扬声器的负极接地；所述第四开关一端耦接在扬声器正极线路上、一端耦接供电电压；所述第四开关在所述分压电路接收到所述使能信号时输出扬声器正极线路上的电压；
    或者，当检测电路输出扬声器负极线路上的电压时，所述检测电路包括分压电路和第四开关；
    所述分压电路耦接在供电电压和扬声器的正极和负极之间，所述分压电路接收到所述使能信号时接通供电电压和扬声器的负极并使扬声器的正极接地；所述第四开关一端耦接在扬声器负极线路上、一端耦接供电电压；所述第四开关在所述分压电路接收到所述使能信号时输出扬声器负极线路上的电压。
  10. 根据权利要求9所述的控制电路，其中，
    当检测电路输出扬声器正极线路上的电压时，所述分压电路包括耦接在供电电压和扬声器正极之间的上拉电阻，以及耦接在扬声器负极和接地之间的下拉电阻，所述上拉电阻和所述下拉电阻配置为与扬声器内阻共同组成分压网络。
  11. 根据权利要求10所述的控制电路，其中，
    所述分压电路还包括耦接在供电电压和扬声器正极之间且分别位于所述上拉电阻各一侧的两个P型金属氧化物半导体PMOS管，耦接在扬声器负极和所述下拉电阻之间的第三NMOS管，所述两个PMOS管并联后还与第四NMOS管串联，所述第四NMOS管配置为接收使能信号并基于所述使能信号导通所述两个PMOS管以接通供电电压和扬声器的正极；所述第三NMOS管配置为接收使能信号以使扬声器的负极接地。
  12. 根据权利要求9所述的控制电路，其中，
    所述第四开关包括第五NMOS管。
  13. 一种控制方法，包括：
    在需要进行扬声器状态检测时，判断扬声器是否处于过压状态；
    当扬声器不处于过压状态时，向检测电路发送使能信号并通过所述检测电路读取扬声器正极线路上的电压或者负极线路上的电压，以判断扬声器的状态。
  14. 根据权利要求13所述的方法，其中，在向检测电路发送使能信号之前，该方法还包括：
    向过压保护电路输出控制信号以断开过压保护电路中的开关。
  15. 根据权利要求13所述的方法，其中，
    所述判断扬声器是否处于过压状态，包括：
    判断是否收到过压识别信号，如果收到，则判断扬声器处于过压状态，如果没有收到，则判断扬声器不处于过压状态；
    或者，主动读取过压保护信号，如果读取到，则判断扬声器处于过压状态，如果没有读取到，则判断扬声器不处于过压状态。
  16. 根据权利要求15所述的方法，其中，当通过所述检测电路读取扬声器正极线路上的电压时，该方法还包括：
    根据所述正极线路上的电压判断扬声器的状态，包括：
    当所述正极线路上的电压为零时，扬声器的状态为扬声器的正极线路SPK_P对地短路；
    当所述正极线路上的电压为VCC_DEC*Rspk/(Rspk+R6)时，扬声器的状态为扬声器的负极线路SPK_N对地短路，或者SPK_P与SPK_N直接连接在一起对地短路；
    当所述正极线路上的电压为VCC_DEC*R5/(R5+R6)时，扬声器的状态为SPK_P与SPK_N互短；
    当所述正极线路上的电压为扬声器的供电电压VCC_DEC，扬声器的状 态为断路，即SPK_P或SPK_N未对电源、对地短路且扬声器SPK没有正常连接在SPK_P与SPK_N的线路上；
    其中，Rspk为扬声器内阻，R6为连接扬声器正极并与扬声器内阻一起构成分压网络的上拉电阻，R5为连接扬声器负极并与扬声器内阻一起构成分压网络的下拉电阻。
  17. 一种控制装置，所述装置包括：存储器、处理器及存储在所述存储器上并可在所述处理器上运行的程序，所述程序被所述处理器执行时实现如权利要求13至16中任一项所述的控制方法。
  18. 一种电子设备，包括如权利要求1-12任一所述的控制电路，还包括控制器，所述控制器被配置为执行如权利要求13至16中任一项所述的控制方法。
  19. 一种存储介质，所述存储介质存储有计算机可执行指令，所述计算机可执行指令被执行时，实现如权利要求13至16任一所述的控制方法。
PCT/CN2019/077982 2018-04-03 2019-03-13 控制电路、控制方法、装置、电子设备及存储介质 WO2019192298A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201810290854.6A CN110350473B (zh) 2018-04-03 2018-04-03 一种控制电路、方法及装置
CN201810290854.6 2018-04-03

Publications (1)

Publication Number Publication Date
WO2019192298A1 true WO2019192298A1 (zh) 2019-10-10

Family

ID=68099924

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2019/077982 WO2019192298A1 (zh) 2018-04-03 2019-03-13 控制电路、控制方法、装置、电子设备及存储介质

Country Status (2)

Country Link
CN (1) CN110350473B (zh)
WO (1) WO2019192298A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112535517A (zh) * 2020-11-12 2021-03-23 嘉善飞阔医疗科技有限公司 一种两线制且具有多个控制输入的超声波手术刀系统

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1960152A (zh) * 2005-11-02 2007-05-09 鸿富锦精密工业（深圳）有限公司 电源切换电路及使用其的电源供应系统
US20120026634A1 (en) * 2010-07-27 2012-02-02 Liu Ta-I Voltage detection circuit device
CN203164277U (zh) * 2012-12-04 2013-08-28 阳光电源股份有限公司 一种过流过压保护检测电路
CN204258412U (zh) * 2014-12-09 2015-04-08 重庆航天工业公司 本安电路、隔爆兼本安不间断电源控制系统和电源
CN205453087U (zh) * 2015-12-29 2016-08-10 先控捷联电气股份有限公司 接触网过电压保护装置

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000044198A1 (en) * 1999-01-25 2000-07-27 Tøpholm & Westermann APS Hearing aid system and hearing aid for in-situ fitting
CN2814762Y (zh) * 2005-03-17 2006-09-06 重庆汇力汽车电子仪表有限公司 带短路、开路预检测的汽车负载电控开关
CN201307924Y (zh) * 2008-11-14 2009-09-09 宇龙计算机通信科技(深圳)有限公司 一种耳机检测电路及采用该耳机检测电路的终端设备
CN101938685B (zh) * 2010-04-20 2013-05-22 惠州市德赛西威汽车电子有限公司 汽车音响喇叭与天线的自动诊断方法
CN103514871B (zh) * 2012-06-15 2017-08-25 万喻 机动车电子喇叭及保护机动车电子喇叭的方法
KR101412711B1 (ko) * 2013-08-02 2014-08-06 (주)전전사 구내방송장치용 이상부하분석 처리방법 및 장치
CN104703110B (zh) * 2013-12-10 2018-12-04 上海博泰悦臻网络技术服务有限公司 喇叭状态诊断电路
CN204291350U (zh) * 2014-12-18 2015-04-22 深圳Tcl数字技术有限公司 扬声器驱动信号异常检测电路及扬声器保护电路
CN106488378A (zh) * 2016-12-30 2017-03-08 广州市保伦电子有限公司 一种扬声器回路状态检测装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1960152A (zh) * 2005-11-02 2007-05-09 鸿富锦精密工业（深圳）有限公司 电源切换电路及使用其的电源供应系统
US20120026634A1 (en) * 2010-07-27 2012-02-02 Liu Ta-I Voltage detection circuit device
CN203164277U (zh) * 2012-12-04 2013-08-28 阳光电源股份有限公司 一种过流过压保护检测电路
CN204258412U (zh) * 2014-12-09 2015-04-08 重庆航天工业公司 本安电路、隔爆兼本安不间断电源控制系统和电源
CN205453087U (zh) * 2015-12-29 2016-08-10 先控捷联电气股份有限公司 接触网过电压保护装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112535517A (zh) * 2020-11-12 2021-03-23 嘉善飞阔医疗科技有限公司 一种两线制且具有多个控制输入的超声波手术刀系统
CN112535517B (zh) * 2020-11-12 2023-09-08 嘉善飞阔医疗科技有限公司 一种两线制且具有多个控制输入的超声波手术刀系统

Also Published As

Publication number Publication date
CN110350473B (zh) 2022-08-12
CN110350473A (zh) 2019-10-18

Similar Documents

Publication Publication Date Title
US9246342B2 (en) Charging system for portable electronic equipment
CN107306043B (zh) 充电唤醒装置及充电唤醒装置的控制方法
JP6348556B2 (ja) ＰｏＤＬワイヤ障害からの保護のための回路構成
CN109655708B (zh) 电动汽车及其高压互锁系统的故障检测装置和方法
US11709210B2 (en) Interlock device for high voltage apparatus
WO2021253336A1 (zh) 车载驱动电路、车载驱动芯片、车载驱动器件及电子设备
CN210577847U (zh) 一种预充模块及预充装置
WO2011130571A1 (en) Pilot signal generation circuit
WO2019192298A1 (zh) 控制电路、控制方法、装置、电子设备及存储介质
CN109532497B (zh) 一种电动汽车高压互锁控制与检测电路
US20230275423A1 (en) Systems and methods to cable shield fault detection and protection
CN109546743B (zh) 车载信息终端的电源控制装置和车载信息终端及车辆
CN112180183A (zh) 一种车载电子设备的状态监测电路及方法
US20210344191A1 (en) Systems and methods to cable shield fault detection and protection
CN110148986B (zh) 电芯充放电控制模块和电芯保护装置
CN211319019U (zh) 具有汽车功能安全设计的epb电控单元电路拓扑结构
CN114184953A (zh) 继电器驱动电路的异常诊断方法及系统
CN107656186B (zh) 一种高压直流电路的检测方法及高压直流电路
CN113933742A (zh) 开关识别电路及电动装置
KR102002672B1 (ko) PoDL 와이어 고장에 대한 보호용 회로 구조
CN220730312U (zh) 一种汽车电压监控系统及电动汽车
US20230266810A1 (en) Abnormality detection circuit, semiconductor device,electronic apparatus, and vehicle
US12021372B2 (en) Power supply system with protection against current variations
CN220913247U (zh) 一种用于供电设备的检测电路及供电设备
CN219266473U (zh) 一种车载紧急按钮的诊断电路

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19782312

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

32PN Ep: public notification in the ep bulletin as address of the adressee cannot be established

Free format text: NOTING OF LOSS OF RIGHTS PURSUANT TO RULE 112(1) EPC (EPO FORM 1205A DATED 04.02.2021)

122 Ep: pct application non-entry in european phase

Ref document number: 19782312

Country of ref document: EP

Kind code of ref document: A1