CN217639265U - Audio receiving device with current self-checking function and data transmission radio system - Google Patents
Audio receiving device with current self-checking function and data transmission radio system Download PDFInfo
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- CN217639265U CN217639265U CN202120804104.3U CN202120804104U CN217639265U CN 217639265 U CN217639265 U CN 217639265U CN 202120804104 U CN202120804104 U CN 202120804104U CN 217639265 U CN217639265 U CN 217639265U
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Abstract
The utility model discloses an audio frequency receiving equipment and data radio station system of electric current self-checking. In the audio receiving equipment with the current self-checking function, a power supply module is respectively connected with an energy storage battery and an MCU (microprogrammed control unit) and is used for supplying power to the energy storage battery according to a control signal of the MCU; the energy storage battery is respectively connected with the power utilization module and the MCU and used for supplying power to the power utilization module according to the control signal of the MCU; the current detection module is respectively connected with the power supply module, the MCU, the energy storage battery and the power utilization module and is used for detecting an input end current signal and an output end current signal of the energy storage battery and determining whether the input end current signal is greater than a first preset threshold value, if so, a first control signal for controlling the power supply module to be disconnected is sent to the MCU; and determining whether the current signal of the output end is greater than a second preset threshold value, and if so, sending a second control signal for controlling the power utilization module to be disconnected to the MCU. The current self-checking of the energy storage battery is realized through the current detection module, and the use safety of the energy storage battery is improved.
Description
Technical Field
The utility model relates to an audio frequency receiving equipment and data radio station system of electric current self-checking.
Background
In the data transmission radio system for emergency early warning, the audio signal transmitting equipment controls the audio receiving equipment to work through the audio signal, and the purpose of remotely controlling and broadcasting emergency early warning information or sending out warning lights and warning information is achieved. Because the audio signal receiving equipment is generally arranged in a field environment, the power supply of the audio signal receiving equipment charges the energy storage battery of the audio signal receiving equipment by converting clean energy such as wind energy, solar energy and the like into electric energy, and then the energy storage battery supplies power for the power amplification module, the warning lamp, the alarm and other power utilization modules of the audio signal receiving equipment. However, due to poor stability of energy sources such as wind energy and solar energy, the current of the power supply is unstable, for example, the charging limit current of the energy storage battery is 5A, if the wind power is too large in a field environment or the solar illumination intensity is too large, and at this time, if the charging amount of the energy storage battery is greater than the power consumption amount, the voltage of the energy storage battery is rapidly increased, the charging current is increased, even the over-current is generated, the heat productivity of the energy storage battery is increased, and potential safety hazards such as fire and explosion are easily caused; and if the consumer that energy storage battery connects damages, for example power amplifier module internal damage, can cause the short circuit of energy storage battery to catch fire or overdischarge, this also can cause the risk that energy storage battery catches fire, explode easily, influences energy storage battery's safety in utilization and life.
SUMMERY OF THE UTILITY MODEL
In view of the technical defects and technical drawbacks in the prior art, embodiments of the present invention provide an audio receiving device and a digital radio system with current self-test that overcome the above problems or at least partially solve the above problems.
The embodiment of the utility model provides an audio frequency receiving equipment of electric current self-checking, include: the system comprises a power supply module, a Micro Control Unit (MCU), an energy storage battery, a power utilization module and a current detection module;
the power supply module is respectively connected with the energy storage battery and the MCU and used for supplying power to the energy storage battery according to the control signal of the MCU;
the energy storage battery is respectively connected with the power utilization module and the MCU and used for supplying power to the power utilization module according to the control signal of the MCU;
the current detection module is respectively connected with the power supply module, the MCU, the energy storage battery and the power utilization module and is used for detecting an input end current signal and an output end current signal of the energy storage battery and determining whether the input end current signal is greater than a first preset threshold value or not, and if so, sending a first control signal for controlling the power supply module to be disconnected to the MCU; and determining whether the current signal of the output end is greater than a second preset threshold value, and if so, sending a second control signal for controlling the power utilization module to be disconnected to the MCU.
In one embodiment, the current detection module may include: the circuit comprises a control signal switch, a first reference voltage modulation circuit, a second reference voltage modulation circuit and a current sampling circuit;
the first reference voltage modulation circuit, the second reference voltage modulation circuit, the current sampling circuit 5 and the control signal switch are respectively connected;
the control signal switch comprises a first comparator and a second comparator;
the current sampling circuit comprises a first transformer and a second transformer.
In one embodiment, the first reference voltage modulation circuit may include a first resistor, a second resistor, and a third resistor;
the first resistor is an adjustable resistor;
the second resistor and the third resistor are connected in series, a common end of the first resistor and the second resistor is connected with a preset reference voltage, and a common end of the first resistor and the third resistor is connected with a first input end of the first comparator;
the second reference voltage modulation circuit comprises a twelfth resistor, a thirteenth resistor and a fourteenth resistor;
the fourteenth resistor is an adjustable resistor;
the twelfth resistor and the thirteenth resistor are connected in series, a common end of the twelfth resistor and the fourteenth resistor is connected with the preset reference voltage, and a common end of the thirteenth resistor and the fourteenth resistor is connected with the first input end of the second comparator;
the current sampling circuit further comprises a first diode, a second diode, a fifth resistor and an eleventh resistor;
the first diode is respectively connected with a first terminal of the secondary coil of the first transformer and one end of the fifth resistor, the other end of the fifth resistor and a second terminal of the secondary coil of the first transformer are grounded, and a common end of the first diode and the fifth resistor is connected with a second input end of the first comparator;
the second diode is respectively connected with a first terminal of a secondary coil of the second transformer and one end of the eleventh resistor, the other end of the eleventh resistor and a second terminal of the secondary coil of the second transformer are grounded, and a common end of the second diode and the eleventh resistor is connected with a second input end of the second comparator.
In one embodiment, the first reference voltage modulation circuit may further include a fourth resistor and a second capacitor, and a common terminal of the first resistor and the third resistor is connected to the first input terminal of the first comparator through the fourth resistor; the second capacitor is connected with the third resistor in parallel;
the common end of the twelfth resistor and the thirteenth resistor is connected to the first input end of the second comparator through the ninth resistor; the sixth capacitor is connected in parallel with the thirteenth resistor.
In one embodiment, the current sampling circuit may further include a seventh resistor, a third capacitor, a fourth capacitor, a tenth resistor, a fifth capacitor, and a seventh capacitor;
the common end of the first diode and the fifth resistor is connected to the second input end of the first comparator through the seventh resistor; the fourth capacitor is connected with the fifth resistor in parallel; the common end of the seventh resistor and the second input end of the first comparator is grounded through the third capacitor;
a common terminal of the second diode and the eleventh resistor is connected to a second input terminal of the second comparator through the tenth resistor; the seventh capacitor is connected in parallel with the eleventh resistor; and the common end of the tenth resistor and the second input end of the second comparator is grounded through the fifth capacitor.
In an embodiment, the current detection module further includes a first capacitor, one end of the first capacitor is connected to the preset reference voltage, and the other end of the first capacitor is grounded.
In one embodiment, the current detection module further includes a sixth resistor and an eighth resistor;
the output end of the first comparator is connected with the MCU through the sixth resistor;
and the output end of the second comparator is connected with the MCU through the eighth resistor.
In one embodiment, the control signal switch may be a dual voltage comparator integrated circuit chip.
In an embodiment, the audio receiving apparatus for current self-test further includes: the safety module is respectively connected with the energy storage battery and the power utilization module;
and the safety module is used for switching off the power supply of the energy storage battery to the power utilization module if the output current of the energy storage battery is greater than a preset current threshold value.
The embodiment of the utility model provides a still provide a number biography electric platform system, include: an audio transmitting device and the audio receiving device with the current self-checking function.
The embodiment of the utility model provides an audio receiving equipment of electric current self-checking detects energy storage battery's charging current and discharge current respectively through the current detection module to when energy storage battery's charging current is greater than first preset threshold value, break off the power supply module to energy storage battery's power supply through MCU control, it is too big to prevent energy storage battery charging amount, voltage risees too fast, produce overcurrent charging, cause energy storage battery calorific capacity to rise, make energy storage battery temperature and interior pressure sharply increase, lead to positive negative pole material contact short circuit, arouse hidden danger such as fire, explosion, influence energy storage battery's safety in utilization; when the discharging current of the energy storage battery is larger than the second preset threshold value, the MCU controls the energy storage battery to be disconnected from supplying power to the power utilization module, and the power utilization module is prevented from being damaged or short-circuited to cause the output current of the energy storage battery to be increased too fast or to be short-circuited. And the hidden danger of fire, explosion and the like is caused, so that the use safety of the energy storage battery is influenced. The current self-checking of the energy storage battery is realized through the current detection module, the convenience and the effectiveness of the current detection of the energy storage battery are improved, frequent manual battery inspection is avoided, and the labor cost is reduced.
Drawings
Fig. 1 is a schematic structural diagram of an audio receiving device for current self-test according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a current detection module according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a control signal switch of the current detection module according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a specific implementation circuit of a current detection module according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an audio receiving apparatus for current self-test according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
In order to make the objects, technical solutions and advantages of the present invention clearer, detailed descriptions are respectively performed below on various specific embodiments of an audio receiving device and a data transmission radio system for current self-inspection provided by an embodiment of the present invention.
Example one
The utility model provides an audio receiving equipment of electric current self-checking, it is shown with reference to figure 1, include: the system comprises a power supply module 1, a micro control unit MCU2, an energy storage battery 3, a power utilization module 4 and a current detection module 5;
the power supply module 1 is respectively connected with the energy storage battery 3 and the MCU2 and is used for supplying power to the energy storage battery 3 according to a control signal of the MCU2;
the energy storage battery 3 is respectively connected with the power utilization module 4 and the MCU2 and is used for supplying power to the power utilization module 4 according to a control signal of the MCU2;
the current detection module 5 is connected with the power supply module 1, the MCU2, the energy storage battery 3 and the power utilization module 4, and is configured to detect an input end current signal and an output end current signal of the energy storage battery 3, determine whether the input end current signal is greater than a first preset threshold, and if so, send a first control signal to the MCU2 to control the power supply module to be turned off; and determining whether the current signal of the output end is greater than a second preset threshold value, and if so, sending a second control signal for controlling the power utilization module to be disconnected to the MCU2.
The embodiment of the utility model provides an audio receiving equipment of electric current self-checking detects energy storage battery's charging current and discharge current respectively through the current detection module to when energy storage battery's charging current is greater than first preset threshold value, break off the power supply module to energy storage battery's power supply through MCU control, it is too big to prevent energy storage battery charging amount, voltage risees too fast, produce overcurrent charging, cause energy storage battery calorific capacity to rise, make energy storage battery temperature and interior pressure sharply increase, lead to positive negative pole material contact short circuit, arouse hidden danger such as fire, explosion, influence energy storage battery's safety in utilization; when the discharging current of the energy storage battery is larger than the second preset threshold value, the MCU controls the energy storage battery to be disconnected from supplying power to the power utilization module, and the power utilization module is prevented from being damaged or short-circuited to cause the output current of the energy storage battery to be increased too fast or to be short-circuited. And the hidden troubles of fire, explosion and the like are caused, so that the use safety of the energy storage battery is influenced. The current self-checking of the energy storage battery is realized through the current detection module, the convenience and the effectiveness of the current detection of the energy storage battery are improved, frequent manual battery inspection is avoided, and the labor cost is reduced.
In one or some optional embodiments, the current detection module 5 includes a first sampling input terminal, a second sampling input terminal, and a detection output terminal, where the first sampling input terminal is connected between the power supply module 1 and the energy storage battery 3, the second sampling input terminal is connected between the energy storage battery 3 and the power utilization module 4, and the detection output terminal is connected to the MCU2; the current detection module 5 detects an input end current signal and an output end current signal of the energy storage battery 3, compares the input end current signal with a first preset threshold value, compares the output end current signal with a second preset threshold value, and sends a first control signal for controlling the power supply module 1 to be disconnected to the MCU2 if the input end current signal is greater than the first preset threshold value; and if the current signal at the output end is smaller than a second preset threshold value, sending a second control signal for controlling the power utilization module 4 to be disconnected to the MCU2.
In one or some alternative embodiments, referring to fig. 2 and 3, the voltage detection module 5 includes: a control signal switch 501, a first reference voltage modulation circuit 502, a second reference voltage modulation circuit 503, and a current sampling circuit 504;
the first reference voltage modulation circuit 502, the second reference voltage modulation circuit 503, the current sampling circuit 504 and the control signal switch 501 are respectively connected;
the control signal switch 501 comprises a first comparator and a second comparator; as a specific implementation manner of the embodiment of the present invention, the voltage control signal switch 501 can be implemented by integrating the first comparator a and the second comparator B into the same chip, i.e. by using a dual voltage comparator integrated circuit. For example, referring to fig. 3, the implementation is performed using an LM393 chip. Wherein, 1 foot of LM393 chip is the output of first comparator, 2 feet are the first input of first comparator, 3 feet are the second input of first comparator, 7 feet are the output of second comparator, 6 feet are the first input of second comparator, 5 feet are the second input of second comparator, 4 feet are the common ground terminal of first comparator and second comparator, 8 feet are the supply terminal of first comparator and second comparator. At this time, the detection output end of the current detection module comprises the output end of the first comparator and the output end of the second comparator, namely pins 1 and 7 of the LM393 chip.
In one or some alternative embodiments, referring to fig. 4, the current sampling circuit 504 includes a first transformer T1 and a second transformer T2; the first sampling input end comprises a first terminal A and a second terminal B of a primary coil of a first transformer T1; the second sampling input terminal comprises a first terminal C and a second terminal D of the primary coil of the second transformer T2.
In one or some alternative embodiments, referring to fig. 4, in the current detection module 5, the first reference voltage modulation circuit 502 includes a first resistor R1, a second resistor R2, and a third resistor R3; wherein, the first resistor R1 is an adjustable resistor;
the second resistor R2 and the third resistor R3 are connected in series, the common end of the first resistor R1 and the second resistor R2 is connected with a preset reference voltage VCC, and the common end of the first resistor R1 and the third resistor R3 is connected with the pin 2 of the LM393 chip;
the second reference voltage modulation circuit 503 includes a twelfth resistor R12, a thirteenth resistor R13, and a fourteenth resistor R14; wherein, the fourteenth resistor R14 is also an adjustable resistor;
the twelfth resistor R12 is connected in series with the thirteenth resistor R13, a preset reference voltage VCC is connected to a common end of the twelfth resistor R12 and the fourteenth resistor R14, and a pin 6 of the LM393 chip is connected to a common end of the thirteenth resistor R13 and the fourteenth resistor R14.
In one or some optional embodiments, referring to fig. 4, in the current detection module 5, the current sampling circuit 504 further includes a first diode D1, a second diode D2, a fifth resistor R5, and an eleventh resistor R11;
the first diode D1 is respectively connected with a first terminal of the secondary coil of the first transformer T1 and one end of the fifth resistor R5, the other end of the fifth resistor R5 is grounded with a second terminal of the secondary coil of the first transformer T1, and a common end of the first diode D1 and the fifth resistor R5 is connected with a 3 pin of the LM393 chip;
the second diode D2 is respectively connected to the first terminal of the secondary coil of the second transformer T1 and one end of the eleventh resistor R11, the other end of the eleventh resistor R11 and the second terminal of the secondary coil of the second transformer T2 are grounded, and the common end of the second diode D2 and the eleventh resistor R11 is connected to the pin 5 of the LM393 chip.
In one or some alternative embodiments, referring to fig. 4, in the current detection module 5, pins 1 and 7 (i.e., terminals E and F in fig. 4) of the LM393 chip are respectively connected to the MCU2.
In one or some alternative embodiments, referring to fig. 4, the first reference voltage modulation circuit 502 further includes a fourth resistor R4 and a second capacitor C2, and a common end of the first resistor R1 and the third resistor R3 is connected to pin 2 of the LM393 chip through the fourth resistor R4; the second capacitor C2 is connected in parallel with the third resistor R3;
the second reference voltage modulation circuit 503 further includes a ninth resistor R9 and a sixth capacitor C6, and a common end of the twelfth resistor R12 and the thirteenth resistor R13 is connected to the pin 6 of the LM393 chip through the ninth resistor R9; the sixth capacitor C6 is connected in parallel with the thirteenth resistor R13.
In one or some alternative embodiments, referring to fig. 4, the current sampling circuit 504 further includes a seventh resistor R7, a third capacitor C3, a fourth capacitor C4, a tenth resistor R10, a fifth capacitor C5, and a seventh capacitor C7;
the common end of the first diode D1 and the fifth resistor R5 is connected to the 3 pins of the LM393 chip through the seventh resistor R7; the fourth capacitor C4 is connected in parallel with the fifth resistor R5; the common end of the seventh resistor R7 and the pin 3 of the LM393 chip is grounded through the third capacitor C3;
the common end of the second diode D2 and the eleventh resistor R11 is connected to the pin 5 of the LM393 chip through the tenth resistor R10; the seventh capacitor C7 is connected in parallel with the eleventh resistor R11; and the common end of the tenth resistor R10 and the 5 pins of the LM393 chip is grounded through the fifth capacitor.
In one or some optional embodiments, referring to fig. 4, the current detection module 5 further includes a first capacitor C1, one end of the first capacitor C1 is connected to the preset reference voltage VCC, and the other end is grounded.
In one or some optional embodiments, referring to fig. 4, the current detection module 5 further includes a sixth resistor R6 and an eighth resistor R8;
the output end of the first comparator, namely pin 1 of the LM393 chip, is connected with the MCU2 through the sixth resistor R6;
the output end of the second comparator, namely pin 7 of the LM393 chip, is connected with the MCU2 through the eighth resistor R8.
In one or some alternative embodiments, referring to fig. 5, the audio receiving apparatus for current self-test further includes: an insurance module 6;
the safety module 6 is respectively connected with the energy storage battery 3 and the power utilization module 4;
and the safety module 6 is used for switching off the power supply of the energy storage battery 3 to the power utilization module 4 if the output current of the energy storage battery 3 is greater than a preset current threshold value.
The embodiment of the utility model provides an in, this insurance module's concrete structure can adopt the implementation among the prior art, for example, fusing fuse, to this, the utility model discloses do not specifically inject.
The embodiment of the utility model provides an in, because audio frequency receiving equipment sets up in field environment, be not convenient for manual monitoring and maintenance, consequently, in order to avoid because the short circuit takes place in the power consumption module, cause energy storage battery power supply unusual, influence audio frequency receiving equipment's safety in utilization, through set up insurance module in audio frequency receiving equipment, the electric current when power consumption module is too big, insurance module can move, cut off energy storage battery to the power supply of power consumption module, avoid causing hidden danger such as energy storage battery is on fire, explosion and endanger audio frequency receiving equipment's normal work.
Example two
Based on the same inventive concept, the utility model also provides a data transmission electric platform system, include: audio transmitting equipment and audio receiving equipment with current self-checking as described in the first embodiment.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice in the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
Claims (10)
1. An audio receiving apparatus for current self-test, comprising: the system comprises a power supply module, a Micro Control Unit (MCU), an energy storage battery, a power utilization module and a current detection module;
the power supply module is respectively connected with the energy storage battery and the MCU and used for supplying power to the energy storage battery according to the control signal of the MCU;
the energy storage battery is respectively connected with the power utilization module and the MCU and used for supplying power to the power utilization module according to the control signal of the MCU;
the current detection module is respectively connected with the power supply module, the MCU, the energy storage battery and the power utilization module and is used for detecting an input end current signal and an output end current signal of the energy storage battery and determining whether the input end current signal is greater than a first preset threshold value, if so, a first control signal for controlling the power supply module to be disconnected is sent to the MCU; and determining whether the current signal of the output end is greater than a second preset threshold value, and if so, sending a second control signal for controlling the power utilization module to be disconnected to the MCU.
2. The audio receiving apparatus of current self-test according to claim 1, wherein the current detection module comprises: the circuit comprises a control signal switch, a first reference voltage modulation circuit, a second reference voltage modulation circuit and a current sampling circuit;
the first reference voltage modulation circuit, the second reference voltage modulation circuit, the current sampling circuit and the control signal switch are respectively connected;
the control signal switch comprises a first comparator and a second comparator;
the current sampling circuit comprises a first transformer and a second transformer.
3. The audio receiving apparatus of current self-test according to claim 2, wherein the first reference voltage modulation circuit includes a first resistor, a second resistor, and a third resistor;
the first resistor is an adjustable resistor;
the second resistor and the third resistor are connected in series, a common end of the first resistor and the second resistor is connected with a preset reference voltage, and a common end of the first resistor and the third resistor is connected with a first input end of the first comparator;
the second reference voltage modulation circuit comprises a twelfth resistor, a thirteenth resistor and a fourteenth resistor;
the fourteenth resistor is an adjustable resistor;
the twelfth resistor and the thirteenth resistor are connected in series, a common end of the twelfth resistor and the fourteenth resistor is connected with the preset reference voltage, and a common end of the thirteenth resistor and the fourteenth resistor is connected with a first input end of the second comparator;
the current sampling circuit further comprises a first diode, a second diode, a fifth resistor and an eleventh resistor;
the first diode is respectively connected with a first terminal of the secondary coil of the first transformer and one end of the fifth resistor, the other end of the fifth resistor and a second terminal of the secondary coil of the first transformer are grounded, and the common end of the first diode and the fifth resistor is connected with the second input end of the first comparator;
the second diode is respectively connected with a first terminal of a secondary coil of the second transformer and one end of the eleventh resistor, the other end of the eleventh resistor and a second terminal of the secondary coil of the second transformer are grounded, and a common end of the second diode and the eleventh resistor is connected with a second input end of the second comparator.
4. The audio receiving device for self-current detection according to claim 3, wherein the first reference voltage modulation circuit further comprises a fourth resistor and a second capacitor, and a common terminal of the first resistor and the third resistor is connected to the first input terminal of the first comparator through the fourth resistor; the second capacitor is connected with the third resistor in parallel;
the second reference voltage modulation circuit further comprises a ninth resistor and a sixth capacitor, and a common end of the twelfth resistor and the thirteenth resistor is connected to the first input end of the second comparator through the ninth resistor; the sixth capacitor is connected in parallel with the thirteenth resistor.
5. The audio receiving device for current self-test according to claim 3, wherein the current sampling circuit further comprises a seventh resistor, a third capacitor, a fourth capacitor, a tenth resistor, a fifth capacitor and a seventh capacitor;
the common end of the first diode and the fifth resistor is connected to the second input end of the first comparator through the seventh resistor; the fourth capacitor is connected with the fifth resistor in parallel; the common end of the seventh resistor and the second input end of the first comparator is grounded through the third capacitor;
a common terminal of the second diode and the eleventh resistor is connected to the second input terminal of the second comparator through the tenth resistor; the seventh capacitor is connected in parallel with the eleventh resistor; and the common end of the tenth resistor and the second input end of the second comparator is grounded through the fifth capacitor.
6. The audio receiving device for current self-test according to claim 3, wherein the current detection module further comprises a first capacitor, one end of the first capacitor is connected to the preset reference voltage, and the other end of the first capacitor is grounded.
7. The audio receiving device for current self-test according to claim 3, wherein the current detection module further comprises a sixth resistor and an eighth resistor;
the output end of the first comparator is connected with the MCU through the sixth resistor;
and the output end of the second comparator is connected with the MCU through the eighth resistor.
8. The current self-test audio receiving device according to claim 2, wherein the control signal switch is a dual voltage comparator integrated circuit chip.
9. The current self-test audio receiving device according to any one of claims 1 to 8, further comprising: the safety module is respectively connected with the energy storage battery and the power utilization module;
and the safety module is used for switching off the power supply of the energy storage battery to the power utilization module if the output current of the energy storage battery is greater than a preset current threshold value.
10. A data transfer station system, comprising: audio transmitting device and audio receiving device for current self-test according to claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120804104.3U CN217639265U (en) | 2021-04-19 | 2021-04-19 | Audio receiving device with current self-checking function and data transmission radio system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120804104.3U CN217639265U (en) | 2021-04-19 | 2021-04-19 | Audio receiving device with current self-checking function and data transmission radio system |
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| CN217639265U true CN217639265U (en) | 2022-10-21 |
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