Measuring circuit and measuring device

Abstract

The utility model provides a measuring circuit and a measuring device. The measuring circuit comprises a power supply module, a control module, a display module and a gear selection module. The power supply module is used for supplying power to the control module, the display module and the gear selection module; the gear selection module is used for switching the measurement gear of the control module to a first measurement gear based on the first control action and switching the measurement gear of the control module to a second measurement gear based on the second control action; wherein the first measurement gear corresponds to a to-be-measured loudspeaker for measuring a first preset internal resistance, and the second measurement gear corresponds to a to-be-measured loudspeaker for measuring a second preset internal resistance; the control module is used for measuring the power of the to-be-tested loudspeaker when being connected with the to-be-tested loudspeaker, generating power data and sending the power data to the display module; and the display module is used for displaying information in the power data so as to feed back the power information of the to-be-tested loudspeaker to a user. According to the invention, measurement errors caused by horn internal resistance differences can be reduced, and the measurement accuracy is improved.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the technical field of electronic circuit, in particular to a measuring circuit and a measuring device. BACKGROUND

[0002] At present, there are two ways to measure the power of notebook computer loudspeaker.

[0003] The first way is to go to the manufacturer's laboratory to measure with the help of instruments. It needs to make an appointment with the manufacturer to go to the laboratory, which is complicated and limited by laboratory resources, and may delay the project process due to the failure to measure in time.

[0004] The second way is to measure the DC voltage across the loudspeaker with a multimeter and convert the power according to the loudspeaker impedance. This method needs to be converted for loudspeakers with different impedances, and the manual conversion process not only increases the complexity of operation, but also easily leads to result deviation due to human error, which is overall inconvenient. CONTENT OF THE UTILITY MODEL

[0005] The embodiment of the present application provides a measuring circuit and a measuring device, which can reduce the measurement error caused by the difference in loudspeaker internal resistance and improve the measurement accuracy.

[0006] In a first aspect, the embodiment of the present application provides a measuring circuit, comprising: a power supply module, a control module, a display module and a gear selection module; the power supply module is connected with the control module, the display module and the gear selection module respectively, and the control module is further connected with the gear selection module and the display module respectively; the power supply module is used to supply power for the control module, the display module and the gear selection module;

[0007] The gear selection module is used to switch the measurement gear of the control module to a first measurement gear based on a first control action, and switch the measurement gear of the control module to a second measurement gear based on a second control action; wherein the first measurement gear corresponds to a loudspeaker to be measured with a first preset internal resistance, and the second measurement gear corresponds to a loudspeaker to be measured with a second preset internal resistance;

[0008] The control module is used to measure the power of the loudspeaker to be measured and generate power data when connected with the loudspeaker to be measured, and send the power data to the display module;

[0009] The display module is used to display the information in the power data, so as to feed back the power information of the loudspeaker to be measured to the user.

[0010] In some embodiments, the gear selection module comprises a gear switch and a resistor R1; a first end of the gear switch is grounded, a common end of the gear switch is connected with the control module, and a second end of the gear switch is connected with the power supply module through the resistor R1.

[0011] In some embodiments, the gear switch is a code switch.

[0012] In some embodiments, the power supply module comprises a battery and a power conversion chip.

[0013] The battery is connected with the power conversion chip, and the power conversion chip is connected with the control module, the display module and the gear selection module respectively.

[0014] In some embodiments, the power supply module further comprises a charging interface and a charging chip.

[0015] The charging interface is connected with the charging chip, the charging interface is further used for connecting with a first power supply, and the charging chip is connected with the battery and the power conversion chip respectively.

[0016] In some embodiments, the power supply module further comprises a power switch.

[0017] A first end of the power switch is connected with the battery and / or the charging chip, a common end of the power switch is connected with the power conversion chip, and a second end of the power switch is suspended.

[0018] In some embodiments, the power switch is a code switch.

[0019] In some embodiments, the control module comprises a control chip and a signal terminal.

[0020] The signal terminal is used for connecting with the to-be-measured loudspeaker, and the control chip is connected with the signal terminal, the power supply module, the display module and the gear selection module respectively.

[0021] In some embodiments, the display module comprises at least one of an LED nixie tube, an LCD display screen and an OLED display screen.

[0022] In a second aspect, the embodiments of the present application provide a measuring device, which comprises the measuring circuit as described above.

[0023] Different from the prior art, the embodiment of the present application provides a measuring circuit and a measuring device, the measuring circuit comprising: a power supply module, a control module, a display module and a gear selection module. The power supply module is connected with the control module, the display module and the gear selection module respectively, and the control module is further connected with the gear selection module and the display module respectively. The power supply module is used for supplying power for the control module, the display module and the gear selection module; the gear selection module is used for switching the measuring gear of the control module to a first measuring gear based on a first control action and switching the measuring gear of the control module to a second measuring gear based on a second control action; wherein the first measuring gear corresponds to a to-be-measured loudspeaker with a first preset internal resistance, and the second measuring gear corresponds to a to-be-measured loudspeaker with a second preset internal resistance; the control module is used for measuring the power of the to-be-measured loudspeaker and generating power data when connected with the to-be-measured loudspeaker, and sending the power data to the display module; and the display module is used for displaying information in the power data to feed back the power information of the to-be-measured loudspeaker to a user.

[0024] The measuring circuit and the measuring device provided by the embodiment of the present application can switch the measuring gear according to different control actions through the gear selection module, and the first measuring gear and the second measuring gear are used for the to-be-measured loudspeakers with the first preset internal resistance and the second preset internal resistance respectively, so that the measuring error caused by the difference in loudspeaker internal resistance is effectively reduced, and the measuring accuracy is improved. Meanwhile, the power supply module stably supplies power for each module, which further guarantees the measuring accuracy. The display module directly presents the power data, so that the user can conveniently obtain the power information of the to-be-measured loudspeaker, and the gear switching operation is simple, which greatly improves the user experience. In addition, the circuit can adapt to the loudspeaker measurement of different internal resistances, has strong universality, and can be widely applied to various scenes. BRIEF DESCRIPTION OF DRAWINGS

[0025] One or more embodiments are illustrated by way of example with reference to the accompanying drawings, which are schematic and not intended to be limiting of the embodiments, and in which like reference numerals designate similar elements in the figures and wherein the use of "about" in connection with a given value means that the value is within a range of ±10% of the given value, unless specifically stated. The drawings are not to scale.

[0026] Figure 1 is a structural block diagram of the measuring circuit provided by some embodiments of the present application;

[0027] Figure 2 is a structural schematic diagram of the power supply module provided by some embodiments of the present application;

[0028] Figure 3 is an interface schematic diagram of the control module, the display module and the gear selection module provided by some embodiments of the present application. DETAILED DESCRIPTION

[0029] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings of the embodiments of the present application to make a clear and detailed description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and not used to limit the present application.

[0030] The technical features involved in the various embodiments of the present application described below do not conflict with each other and can be combined with each other.

[0031] When an element is described as "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements can be present between them.

[0032] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually a class, not limited to the number of objects, for example, the first object can be one or more.

[0033] Please refer to Figure 1 , Figure 1 is the structural block diagram of the measurement circuit 100 provided by some embodiments of the present application.

[0034] The embodiments of the present application provide a measurement circuit 100, comprising: a power supply module 10, a control module 20, a display module 30, a gear selection module 40. Wherein, the power supply module 10 is connected with the control module 20, the display module 30 and the gear selection module 40 respectively, and the control module 20 is further connected with the gear selection module 40 and the display module 30 respectively.

[0035] Specifically, the power supply module 10 is used to supply power for the control module 20, the display module 30 and the gear selection module 40. The gear selection module 40 is used to switch the measurement gear of the control module 20 to the first measurement gear based on the first control action, and switch the measurement gear of the control module 20 to the second measurement gear based on the second control action. Wherein, the first measurement gear corresponds to the measured speaker 200 with the first preset internal resistance, and the second measurement gear corresponds to the measured speaker 200 with the second preset internal resistance. The control module 20 is used to measure the power of the measured speaker 200 and generate power data when connected with the measured speaker 200, and send the power data to the display module 30. The display module 30 is used to display the information in the power data, so as to feed back the power information of the measured speaker 200 to the user.

[0036] The to-be-tested loudspeaker is the object to be measured, and is the main test target of the measurement circuit. In this embodiment, it is usually a conventional loudspeaker (such as a moving coil loudspeaker, etc.), and its internal resistance is one of the factors to be considered.

[0037] The first preset internal resistance refers to a certain resistance value of the internal resistance of the to-be-tested loudspeaker, which is pre-determined and corresponds to the first measurement gear. For example, the first preset internal resistance can be 4Ω, and when the internal resistance of the to-be-tested loudspeaker is 4Ω, the user needs to switch the control module 20 to the first measurement gear to perform power measurement.

[0038] The second preset internal resistance is another pre-determined internal resistance value of the to-be-tested loudspeaker, which corresponds to the second measurement gear. For example, the second preset internal resistance can be 8Ω, and when the internal resistance of the to-be-tested loudspeaker is 8Ω, the user needs to switch the control module 20 to the second measurement gear to perform power measurement. This can ensure the accuracy and effectiveness of the measurement.

[0039] The first measurement gear is a specific working state of the measurement circuit, which is used to measure the to-be-tested loudspeaker with the first preset internal resistance. In this gear, the measurement parameters (such as current, voltage range, etc.) of the control module 20 and the related calculation methods, etc. can be optimized to ensure that the power of the to-be-tested loudspeaker with the first preset internal resistance can be accurately measured.

[0040] The second measurement gear is another specific working state of the measurement circuit, which is used to measure the to-be-tested loudspeaker with the second preset internal resistance. The difference between it and the first measurement gear is that the internal parameter settings (such as current, voltage range, etc.) are optimized for the second preset internal resistance loudspeaker. For example, the signal processing circuit in the second measurement gear can use different currents, voltages, etc. than the first measurement gear to adapt to the power measurement requirements of the second preset internal resistance loudspeaker.

[0041] The first control action is the operation of the gear selection module 40 by the user, which is used to switch the measurement gear of the control module 20 to the first measurement gear. This operation can be pressing a button, turning a switch, or other similar manual operations. For example, in the actual circuit, it can be triggered by pressing a button marked with “first gear”, “4Ω”, etc. to make the measurement circuit enter a working state suitable for measuring the to-be-tested loudspeaker with the first preset internal resistance.

[0042] The second control action is similar to the first control action, which is also an operation of the user on the gear selection module 40, and the purpose is to switch the measurement gear of the control module 20 to the second measurement gear. Similarly, this operation can be realized by some manual method, such as dialing a dial switch to a specific position, etc. For example, there can be a dial lever on the device, and dialing it to the other side triggers the second control action, so that the measurement circuit is ready to measure the second preset internal resistance of the speaker under test.

[0043] In actual application, first, the power supply module 10 works to provide power for the control module 20, the display module 30 and the gear selection module 40.

[0044] Then, when the user needs to measure the power of the speaker under test 200, first, the gear selection is made according to the internal resistance of the speaker under test. If the internal resistance of the speaker under test 200 is the first preset internal resistance, the user operates the gear selection module 40 by the first control action. For example, it can be pressing a specific button or dialing a switch, so that the gear selection module 40 switches the measurement gear of the control module 20 to the first measurement gear. Similarly, if the internal resistance of the speaker under test 200 is the second preset internal resistance, the user performs the second control action, and the gear selection module 40 switches the measurement gear of the control module 20 to the second measurement gear.

[0045] Then, after the measurement gear of the control module 20 is switched, the speaker under test 200 (at this time, the speaker under test 200 is normally working) is connected to the control module 20. The control module 20 measures the voltage across the speaker under test 200 and the current passing through it. According to the power calculation formula (for example, P = U^2 / R, where P is the power of the speaker under test, U is the voltage across the speaker under test, and R is the internal resistance of the speaker under test), the control module 20 calculates the power of the speaker under test 200, thereby generating power data.

[0046] Then, the control module 20 sends the generated power data to the display module 30. After receiving the power data, the display module 30 processes and displays the data. For example, it can directly display the power data in digital form on the screen, or feed back the power information to the user through the flashing frequency of the indicator light, so that the user can intuitively obtain the power information of the speaker under test 200.

[0047] Please refer to Figure 2 , Figure 2 is a structural schematic diagram of the power supply module 10 provided by some embodiments of the present application.

[0048] In some embodiments, the power supply module 10 includes a battery 13 and a power conversion chip 14. The battery 13 is connected to the power conversion chip 14, and the power conversion chip 14 is connected to the control module 20, the display module 30 and the gear selection module 40, respectively.

[0049] Specifically, battery 13 can power power conversion chip 14.

[0050] The power conversion chip 14 can be a chip of model ASM1117 or any other suitable chip.

[0051] In some embodiments, the power supply module 10 further includes a charging interface 11 and a charging chip 12. The charging interface 11 is connected to the charging chip 12 and is also used to connect to a first power source (not shown). The charging chip 12 is connected to the battery 13 and the power conversion chip 14, respectively.

[0052] Specifically, battery 13 is a rechargeable battery, such as a lithium battery or a rechargeable dry cell battery. The first power source is an external power supply, which provides power for charging battery 13 and also for power conversion chip 14.

[0053] The charging chip 12 is used to obtain electrical energy from the first power source to power the battery 13 and / or the power conversion chip 14. The charging chip 12 can be a PW4052, a PW4241, or any other suitable chip.

[0054] In some embodiments, the power supply module 10 further includes a power switch 15. The first terminal of the power switch 15 is connected to the battery 13 and / or the charging chip 12, the common terminal of the power switch 15 is connected to the power conversion chip 14, and the second terminal of the power switch 15 is left floating.

[0055] In some embodiments, the power switch 15 is a DIP switch.

[0056] Specifically, Figure 2 In this example, the middle pin of power switch 15 is the common terminal, the left pin of power switch 15 is the first terminal, and the right pin of power switch 15 is the second terminal.

[0057] When the lever of power switch 15 is moved to the left ( Figure 2 When the power conversion chip 14 is on the ON side, the middle pin is connected to the left pin (i.e., the common terminal is connected to the first terminal), and the right pin is disconnected (i.e., the common terminal is disconnected from the second terminal). At this time, the power conversion chip 14 is connected to the battery 13 and / or the charging chip 12, meaning that the power conversion chip 14 is powered. In this case, the power conversion chip 14 can supply power to the control module 20, the display module 30, and the gear selection module 40.

[0058] When the lever is moved to the right ( Figure 2When the middle pin of the gear switch 41 is connected with the left pin (i.e., the common end is connected with the first end) and the right pin of the gear switch 41 is disconnected (i.e., the common end is disconnected with the second end), one GPIO pin of the control module 20 is grounded, which is used to prompt the control module 20 to test the first preset resistance (for example, 4Ω) speaker to be tested, so that the parameter settings (such as current, voltage range, etc.) in the control module 20 meet the test of the first preset resistance speaker to be tested.

[0059] It should be noted that the power switch 15 in the embodiment is not limited to this kind of dial switch, and any dial switch with the same function is applicable.

[0060] Please refer to Figure 3 , Figure 3 is an interface diagram of the control module 20, the display module 30 and the gear selection module 40 provided by some embodiments of the present application.

[0061] In some embodiments, the gear selection module 40 includes a gear switch 41 and a resistor R1. Wherein, the first end of the gear switch 41 is grounded, the common end of the gear switch 41 is connected with the control module 20, and the second end of the gear switch 41 is connected with the power supply module 10 through the resistor R1.

[0062] In some embodiments, the gear switch 41 is a dial switch.

[0063] Specifically, Figure 3 For example, in the gear switch 41, the middle pin is the common end, the left pin is the first end, and the right pin is the second end.

[0064] When the dial rod of the gear switch 41 is dialled to the left side (i.e., the 4Ω side in the Figure 3 , the middle pin is connected with the left pin (i.e., the common end is connected with the first end), and the middle pin is disconnected with the right pin (i.e., the common end is disconnected with the second end), at this time, one GPIO pin of the control module 20 is grounded, which is used to prompt the control module 20 to test the first preset resistance (for example, 4Ω) speaker to be tested, so that the parameter settings (such as current, voltage range, etc.) in the control module 20 meet the test of the first preset resistance speaker to be tested.

[0065] When the dial rod is dialled to the right side (i.e., the 8Ω side in the Figure 3 , the middle pin is connected with the right pin, and the middle pin is disconnected with the left pin, at this time, one GPIO pin of the control module 20 is connected with the power supply module 10 through the resistor R1, which is used to prompt the control module 20 to test the second preset resistance (for example, 8Ω) speaker to be tested, so that the parameter settings (such as current, voltage range, etc.) in the control module 20 meet the test of the second preset resistance speaker to be tested.

[0066] It should be noted that the gear switch 41 in the embodiment is not limited to this kind of dial switch, and any dial switch with the same function is applicable.

[0067] In some embodiments, the control module 20 comprises a control chip 21 and a signal terminal 22. The signal terminal 22 is used to connect with the speaker 200 to be measured, and the control chip 21 is connected with the signal terminal 22, the power supply module 10, the display module 30 and the gear selection module 40 respectively.

[0068] The control chip 21 can be a chip of model ATmega168, a chip of model stc89c51, a chip of model ESP8266, or any other suitable chip.

[0069] It should be noted that the control chip 21 is not limited to a specific model, but needs to be a chip with ADC function, which is used to detect the signal of the speaker to be measured, perform power conversion, and drive the display module 30 to display.

[0070] In some embodiments, the display module 30 comprises at least one of an LED nixie tube, an LCD display screen and an OLED display screen.

[0071] Specifically, the display module 30 is used to display the power of the speaker to be measured in real time, which can be but is not limited to an LED nixie tube, an LCD display screen or an OLED display screen.

[0072] The working principle of the measurement circuit 100 will be described below. Figure 2 and Figure 3 The working principle of the measurement circuit 100 will be described below.

[0073] The signal terminal 22 is a jack seat, which can connect with the probes of a multimeter. When measuring, one end of the two probes is inserted into the measurement circuit 100, and the other end is connected to the two ends of the speaker 200 to be measured (at this time, the speaker 200 to be measured is normally working, for example, the speaker 200 to be measured plays a standard 1KHz sine wave audio file and the volume is adjusted to the maximum).

[0074] The power switch 15 is turned to the ON side, and the battery 13 supplies power to each module in the embodiment through the power conversion chip 14.

[0075] After the control chip 21 is powered on, it runs the code of the predetermined logic to obtain the power of the speaker to be measured. The logic is to detect the voltages of the two channels of the speaker 200 to be measured through the ADC interface of the control chip 21, and then perform difference processing to obtain the voltage signal between the two ends of the speaker 200 to be measured. The control chip 21 reads the level state of the GPIO[0] interface. If the GPIO[0] interface is low, it means that the speaker to be measured is 4Ω; if the GPIO[0] interface is high, it means that the speaker to be measured is 8Ω. According to the level state of the GPIO[0] interface read, the impedance of the speaker 200 to be measured is determined, and the power of the speaker to be measured can be obtained according to the power conversion formula: P=U^2 / R.

[0076] The control chip 21 drives the display module 30 to display the horn power in real time through an I2C interface or a GPIO interface, etc. At this time, the power value of the measured horn can be directly read on the display module.

[0077] The type of the display module 30 determines the type of the interface for communication with the control chip 21. The display module 30 of the LCD / OLED type generally uses an I2C interface. The display module 30 of the digital tube type generally uses a GPIO interface.

[0078] In addition, in the embodiments of the present application, the interface labels ADC[0], ADC[1], I2C[0], GPIO[0], GPIO[1:n], etc. do not represent actual interfaces, but only serve as examples, and are adjusted according to the type of the selected control chip 21 and the type of the display module 30, etc.

[0079] The measurement circuit 100 provided by the embodiments of the present application can switch the measurement range according to different control actions through the gear selection module, and uses the corresponding first measurement range and second measurement range for the horn to be measured with the first preset resistance and the second preset resistance, respectively, effectively reducing the measurement error caused by the difference in horn resistance and improving the measurement accuracy. At the same time, the power supply module stably supplies power to each module, further ensuring the measurement accuracy. The display module directly presents the power data, so that the user can conveniently obtain the power information of the horn to be measured, and the gear switching operation is simple, greatly improving the user experience. Furthermore, this circuit can adapt to the measurement of horns with different resistances, has strong universality, and can be widely applied to various scenes.

[0080] The embodiments of the present application also provide a measurement device, which comprises the measurement circuit 100 as described above.

[0081] The measurement circuit 100 can be used to connect with the horn to be measured 20, measure the power of the horn to be measured 20, and display the power information of the horn to be measured 200.

[0082] The specific structure and working principle of the measurement circuit 100 can be referred to the above-mentioned embodiments, which will not be described here again.

[0083] Finally, it should be noted that: the above examples are used to illustrate the technical solutions of the present application, rather than limiting them; under the idea of the present application, the technical features in the above examples or different examples can also be combined, and there are many other changes of different aspects of the present application as described above, in order to be simple, they are not provided in details; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of each embodiment of the present application.

Claims

1. A measuring circuit, characterized by The application relates to a measuring device for measuring the power of a loudspeaker. The measuring device comprises a power supply module, a control module, a display module and a gear selection module. The power supply module is connected with the control module, the display module and the gear selection module. The control module is connected with the gear selection module and the display module. The power supply module is used for supplying power to the control module, the display module and the gear selection module. The gear selection module is used for switching the measuring gear of the control module to a first measuring gear based on a first control action and switching the measuring gear of the control module to a second measuring gear based on a second control action. The control module is used for measuring the power of the loudspeaker and generating power data when connected with the loudspeaker.

2. The measurement circuit of claim 1, wherein, The display module is used for displaying the information in the power data to feed back the power information of the loudspeaker to a user. The gear selection module comprises a gear switch and a resistor R1.

3. The measurement circuit of claim 2, wherein, The first end of the gear switch is grounded, the common end of the gear switch is connected with the control module, and the second end of the gear switch is connected with the power supply module through the resistor R1.

4. The measurement circuit of claim 1, wherein, The gear switch is a code switch. The power supply module comprises a battery and a power conversion chip.

5. The measurement circuit of claim 4, wherein, The battery is connected with the power conversion chip, and the power conversion chip is connected with the control module, the display module and the gear selection module. The power supply module further comprises a charging interface and a charging chip.

6. The measurement circuit of claim 5, wherein, The charging interface is connected with the charging chip, the charging interface is further used for being connected with a first power supply, and the charging chip is connected with the battery and the power conversion chip. The power supply module further comprises a power switch.

7. The measurement circuit of claim 6, wherein, The first end of the power switch is connected with the battery and / or the charging chip, the common end of the power switch is connected with the power conversion chip, and the second end of the power switch is suspended.

8. The measurement circuit of claim 1, wherein, The power switch is a code switch. The control module comprises a control chip and a signal terminal.

9. The measuring circuit according to any one of claims 1 to 8, characterized in that, The signal terminal is used for being connected with the loudspeaker, and the control chip is connected with the signal terminal, the power supply module, the display module and the gear selection module.

10. A measuring device, characterized by The display module comprises at least one of an LED digital tube, an LCD display screen and an OLED display screen. The measuring device comprises the measuring circuit in any one of claims 1 to 9.

Images