阅读说明：本技术 一种信号传输电路、电源线及设备 (Signal transmission circuit, power line and equipment ) 是由 施镇乾 于 2020-12-18 设计创作，主要内容包括：本申请提供了一种信号传输电路、电源线及设备,涉及信号传输技术领域,该信号传输电路与一直流电源线的正极连接,信号传输电路包括调制电路和/或解调电路,其中,调制电路包括调制芯片,调制芯片用于接收输入信号,依据输入信号生成调制信号,并将调制信号通过电源线的正极输出；解调电路包括隔直单元与解调单元,隔直单元分别与解调单元、电源线的正极连接,隔直单元用于隔离电源线正极的直流信号,并输出调制信号；解调单元用于对调制信号进行解调并输出。本申请提供的信号传输电路、电源线及设备具有线路更加简单的优点。(The application provides a signal transmission circuit, a power line and equipment, and relates to the technical field of signal transmission, wherein the signal transmission circuit is connected with the anode of a direct current power line and comprises a modulation circuit and/or a demodulation circuit, the modulation circuit comprises a modulation chip, and the modulation chip is used for receiving an input signal, generating a modulation signal according to the input signal and outputting the modulation signal through the anode of the power line; the demodulation circuit comprises a blocking unit and a demodulation unit, wherein the blocking unit is respectively connected with the demodulation unit and the anode of the power line and is used for isolating the direct current signal of the anode of the power line and outputting a modulation signal; the demodulation unit is used for demodulating and outputting the modulation signal. The signal transmission circuit, the power line and the equipment have the advantage of simpler circuit.)

1. Signal transmission circuit, characterized in that the signal transmission circuit is connected to the positive pole of a DC power supply line, the signal transmission circuit comprising a modulation circuit and/or a demodulation circuit, wherein,

the modulation circuit comprises a modulation chip, the modulation chip is used for receiving an input signal, generating a modulation signal according to the input signal and outputting the modulation signal through the anode of the power line;

the demodulation circuit comprises a blocking unit and a demodulation unit, the blocking unit is respectively connected with the demodulation unit and the anode of the power line, and the blocking unit is used for isolating the direct current signal of the anode of the power line and outputting the modulation signal; the demodulation unit is used for demodulating and outputting the modulation signal.

2. The signal transmission circuit according to claim 1, wherein the modulation circuit further comprises a signal output unit, the signal output unit is connected to the output terminal of the modulation chip, and the signal output unit is configured to couple the modulation signal output by the modulation chip to the positive electrode of the power line.

3. The signal transmission circuit according to claim 2, wherein the signal output unit includes a first resistor and a first capacitor, and the first resistor and the first capacitor are connected in series and then respectively connected to the output terminal of the modulation chip and the positive electrode of the power line.

4. The signal transmission circuit according to any one of claims 1 to 3, wherein the demodulation unit includes a demodulation module, a buffer module, and a reference voltage supply module, the demodulation module is connected to the buffer module and the reference voltage supply module, respectively, and the buffer module is connected to the reference voltage regulation module; the reference voltage supply module is used for providing reference voltage for the demodulation module and the buffer module.

5. The signal transmission circuit according to claim 4, wherein the demodulation module comprises a first diode, a first discharge loop and a first comparator, the first diode is respectively connected with the DC blocking unit, the first discharge loop and an inverting input terminal of the first comparator, the first diode is used for rectifying the signal output by the DC blocking unit, a non-inverting input terminal of the first comparator is connected with the reference voltage supply module, and an output terminal of the first comparator is connected with the buffer module.

6. The signal transmission circuit according to claim 5, wherein the first discharge circuit includes a second capacitor and a second resistor, one end of the second resistor is connected to the first diode, and the other end of the second resistor is grounded; one end of the second capacitor is connected with the first diode, and the other end of the second capacitor is grounded.

7. The signal transmission circuit according to claim 5, wherein the reference voltage supply module comprises a second diode and a second discharge loop, the second diode is respectively connected with the second discharge loop and the dc blocking unit, and the second discharge loop is further connected with a non-inverting input terminal of the first comparator; wherein the second discharge loop and the first discharge loop have different discharge time.

8. The signal transmission circuit as claimed in claim 5, wherein the buffer module comprises a second comparator, the reference voltage supply module comprises a voltage divider circuit, a non-inverting input terminal of the second comparator is connected to an output terminal of the first comparator, an inverting input terminal of the second comparator is connected to the voltage divider circuit, and the voltage divider circuit is further connected to a power supply.

9. A power supply line, characterized in that it comprises a signal transmission circuit according to any one of claims 1-8.

10. An apparatus, characterized in that the apparatus comprises a signal transmission circuit according to any one of claims 1-8.

Technical Field

The application relates to the technical field of signal transmission, in particular to a signal transmission circuit, a power line and equipment.

Background

At present, with the continuous development of smart home technology, more and more smart home devices appear in people's daily life.

However, in the current smart home devices, the power line and the signal line are both separately arranged, which results in a complex circuit of the smart home devices.

In summary, there is the problem that the circuit of the smart home device is complicated in the prior art.

Disclosure of Invention

The utility model provides a signal transmission circuit, power cord and equipment are provided to solve the comparatively complicated problem of intelligent house equipment's circuit that exists among the prior art.

In order to achieve the above purpose, the embodiments of the present application employ the following technical solutions:

in a first aspect, the present embodiments provide a signal transmission circuit, the signal transmission circuit is connected to a positive pole of a dc power line, the signal transmission circuit includes a modulation circuit and/or a demodulation circuit, wherein,

the modulation circuit comprises a modulation chip, the modulation chip is used for receiving an input signal, generating a modulation signal according to the input signal and outputting the modulation signal through the anode of the power line;

the demodulation circuit comprises a blocking unit and a demodulation unit, the blocking unit is respectively connected with the demodulation unit and the anode of the power line, and the blocking unit is used for isolating the direct current signal of the anode of the power line and outputting the modulation signal; the demodulation unit is used for demodulating and outputting the modulation signal.

Optionally, the modulation circuit further includes a signal output unit, the signal output unit is connected to the output end of the modulation chip, and the signal output unit is configured to couple the modulation signal output by the modulation chip to the positive electrode of the power line.

Optionally, the signal output unit includes a first resistor and a first capacitor, and the first resistor and the first capacitor are connected in series and then respectively connected to the output end of the modulation chip and the anode of the power line.

Optionally, the demodulation unit includes a demodulation module, a buffer module, and a reference voltage supply module, where the demodulation module is connected to the buffer module and the reference voltage supply module, respectively, and the buffer module is connected to the reference voltage stable supply module; the reference voltage supply module is used for providing reference voltage for the demodulation module and the buffer module.

Optionally, the demodulation module includes a first diode, a first discharge loop, and a first comparator, the first diode is connected to the dc blocking unit, the first discharge loop, and an inverting input terminal of the first comparator, the first diode is configured to rectify a signal output by the dc blocking unit, a non-inverting input terminal of the first comparator is connected to the reference voltage supply module, and an output terminal of the first comparator is connected to the buffer module.

Optionally, the first discharge loop includes a second capacitor and a second resistor, one end of the second resistor is connected to the first diode, and the other end of the second resistor is grounded; one end of the second capacitor is connected with the first diode, and the other end of the second capacitor is grounded.

Optionally, the reference voltage supply module includes a second diode and a second discharge loop, the second diode is respectively connected to the second discharge loop and the dc blocking unit, and the second discharge loop is further connected to a non-inverting input terminal of the first comparator; wherein the second discharge loop and the first discharge loop have different discharge time.

Optionally, the buffer module includes a second comparator, the reference voltage supply module includes a voltage divider circuit, a non-inverting input terminal of the second comparator is connected to an output terminal of the first comparator, an inverting input terminal of the second comparator is connected to the voltage divider circuit, and the voltage divider circuit is further connected to a power supply.

In a second aspect, the present application provides a power line, which includes the signal transmission circuit described above.

In a third aspect, an embodiment of the present application further provides an apparatus, where the apparatus includes the signal transmission circuit described above.

Compared with the prior art, the method has the following beneficial effects:

the embodiment of the application provides a signal transmission circuit, a power line and equipment, wherein the signal transmission circuit is connected with the anode of a direct current power line and comprises a modulation circuit and/or a demodulation circuit, the modulation circuit comprises a modulation chip, and the modulation chip is used for receiving an input signal, generating a modulation signal according to the input signal and outputting the modulation signal through the anode of the power line; the demodulation circuit comprises a blocking unit and a demodulation unit, wherein the blocking unit is respectively connected with the demodulation unit and the anode of the power line and is used for isolating the direct current signal of the anode of the power line and outputting a modulation signal; the demodulation unit is used for demodulating and outputting the modulation signal. Because the power line is adopted to realize the transmission of signals, no additional signal line is needed, and the circuit between the devices is simpler.

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and it will be apparent to those skilled in the art that other related drawings can be obtained from the drawings without inventive effort.

Fig. 1 is a circuit diagram of a modulation circuit according to an embodiment of the present application.

Fig. 2 is a circuit diagram of a demodulation circuit according to an embodiment of the present application.

Fig. 3 is a schematic diagram of connections between devices according to an embodiment of the present application.

Icon:

110-a modulation circuit; 111-a signal output unit; u1-modulation chip; r1 — first resistance; c1 — first capacitance; 200-a demodulation circuit; 210-a blocking unit; 220-a demodulation unit; 221-a demodulation module; 222-a buffer module; 223-reference voltage supply module; BP1 — first diode; 2211 — first discharge circuit; u2 — first comparator; r2 — second resistance; c2 — second capacitance; u3 — second comparator; BP2 — second diode; 2231-a second discharge circuit; c3 — third capacitance; r3 — third resistance; r4-fourth resistor; 2232 voltage divider circuit; r5-fifth resistor; r6-sixth resistance; r7-isolation resistance.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are used only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically connected or connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

As described in the background art, the prior art has a problem that the lines of the smart home devices are more and complicated. In view of this, the embodiment of the present application provides a signal transmission circuit, which simplifies a line of a smart home device by using a power line to simultaneously supply power and transmit a signal.

The following is an exemplary description of the signal transmission circuit provided in the present application:

as an alternative implementation, the signal transmission circuit is connected to the positive pole of the dc power line, and the signal transmission circuit includes the modulation circuit 110 and/or the demodulation circuit 200. Referring to fig. 1, the modulation circuit 110 includes a modulation chip U1, and the modulation chip U1 is configured to receive an input signal, generate a modulation signal according to the input signal, and output the modulation signal through the positive electrode of the power line. Referring to fig. 2, the demodulation circuit 200 includes a blocking unit 210 and a demodulation unit 220, the blocking unit 210 is respectively connected to the demodulation unit 220 and the positive electrode of the power line, and the blocking unit 210 is configured to isolate the dc signal of the positive electrode of the power line and output a modulation signal; the demodulation unit 220 is configured to demodulate and output the modulated signal.

The dc power line includes a positive electrode and a negative electrode, and the positive electrode of the power line is used for signal transmission.

Meanwhile, as a first implementation manner, the signal transmission circuit may only include the modulation circuit 110, an output end of the modulation circuit 110 is connected to a positive electrode of the dc power line, and the modulation circuit 110 may modulate a signal and transmit the modulated signal to the positive electrode of the power line. As a second implementation manner, the signal transmission circuit may include only the demodulation circuit 200, and an input end of the demodulation circuit 200 is connected to the positive electrode of the dc power line, so that the signal transmission circuit can receive the modulated signal transmitted through the power line and demodulate the modulated signal. As a third implementation manner, the signal transmission circuit may include both the modulation circuit 110 and the demodulation circuit 200, and the signal transmission circuit may transmit the modulation signal to other devices through the positive electrode of the dc power line, or may receive and demodulate the modulation signal transmitted by other devices through the positive electrode of the dc power line.

Optionally, with reference to fig. 1, the modulation chip is a buffer driver having a tri-state output function, and the modulation chip U1 of the type includes 5 pins, which are an EN pin, an IN pin, a GND pin, a VCC pin, and an OUT pin, respectively, where the EN pin is connected to the positive electrode of the dc power line, the IN pin is used for inputting a modulation pulse signal, the GND pin is grounded, the VCC pin is used for connecting to a power supply, and the modulated signal is output through the OUT pin. The power supply provided by the application can be a 3.3V power supply so as to supply power to the modulation chip U1.

Of course, in other embodiments, the modulation chip U1 may be of other types, which is not limited in this application.

As an implementation manner, in order to couple the modulation chip U1 to the power line, the modulation circuit 110 further includes a signal output unit 111, the signal output unit 111 is connected to the output terminal of the modulation chip U1, and the signal output unit 111 is configured to couple the modulation signal output by the modulation chip U1 to the positive pole of the power line.

The signal output unit 111 may include a first resistor R1 and a first capacitor C1, and the first resistor R1 is connected in series with the first capacitor C1 and then connected to the output terminal of the modulation chip U1 and the positive electrode of the power line.

It will be appreciated that the first resistor R1 is used for coupling matching and the first capacitor C1 is used for coupling the modulated signal to the positive supply line.

Through above-mentioned implementation, can realize positive to the power cord with modulation signal coupling, and then make modulation signal pass through the anodal transmission that realizes of power cord, need not to increase extra signal transmission line for intelligent household equipment's circuit is simpler.

After the modulation signal is coupled to and transmitted through the positive power line electrode, the analytic device can also analyze the modulation signal from the signal of the positive power line electrode.

Referring to fig. 2, as an implementation manner, the blocking unit 210 may be a blocking capacitor, and as another implementation manner, the blocking unit 210 may also be a transformer. The dc blocking unit 210 can isolate the dc current of the positive pole of the power line, further analyze the ac signal (i.e. the modulated signal) in the positive pole of the power line, and then demodulate the modulated signal by the demodulation unit 220. Of course, any device capable of achieving the dc isolation function may be used as the dc blocking unit 210 provided in the present application.

Optionally, the demodulation unit 220 includes a demodulation module 221, a buffer module 222, and a reference voltage supply module 223, where the demodulation module 221 is connected to the buffer module 222 and the reference voltage supply module 223, respectively, and the buffer module 222 is also connected to the reference voltage stable supply module; the reference voltage supply module 223 is used for providing a reference voltage for the demodulation module 221 and the buffer module 222.

In this application, the demodulation module 221 is configured to demodulate a modulated signal, and the buffer module 222 is configured to buffer and output the demodulated signal. Of course, in a possible implementation manner, the demodulation unit 220 may also include only the demodulation module 221 and the reference voltage supply module 223, which is not limited herein.

Optionally, the demodulation unit 220 includes a first diode BP1, a first discharge loop 2211, and a first comparator U2, the first diode BP1 is respectively connected to the dc blocking unit 210, the first discharge loop 2211, and the inverting input terminal of the first comparator U2, the first diode BP1 is configured to rectify the signal output by the dc blocking unit 210, the non-inverting input terminal of the first comparator U2 is connected to the reference voltage supply module 223, and the output terminal of the first comparator U2 is connected to the buffer module 222.

The first diode BP1 is configured to rectify the modulation signal, so that the modulation signal is converted from ac to dc and output to the non-inverting input terminal of the first comparator U2. Alternatively, the first diode BP1 may be a normal diode, and of course, the first diode BP1 may also be a schottky diode.

When the first diode BP1 is a normal diode, the anode of the first diode BP1 is connected to the dc blocking unit 210, and the cathode of the first diode BP1 is connected to the first discharge circuit 2211 and the inverting input terminal of the first comparator U2, respectively. When the first diode BP1 is a schottky diode, the first terminal of the first diode BP1 is connected to the dc blocking unit 210, the second terminal of the first diode BP1 is connected to the power supply, and the third terminal of the first diode BP1 is connected to the first discharge loop 2211 and the inverting input terminal of the first comparator U2, respectively. Also, the first terminal of the first diode BP1 is a common anode port.

It should be noted that the power supply connected to the second end of the first diode BP1 may be a 3.3V power supply, and in order to make the power supply output more stable, optionally, the second end of the first diode BP1 is further connected to one end of a filter capacitor, and the other end of the filter capacitor is grounded. Meanwhile, the effect of level clamping can be realized by connecting the second end of the Schottky diode with the power supply.

Optionally, the first discharge loop 2211 includes a second capacitor C2 and a second resistor R2, one end of the second resistor R2 is connected to the first diode BP1, and the other end of the second resistor R2 is grounded; one end of the second capacitor C2 is connected to the first diode BP1, and the other end of the second capacitor C2 is grounded. By providing the second capacitor C2 and the second resistor R2, an RC discharge circuit can be formed. The first comparator U2 can demodulate the modulation signal by comparing the voltages at the non-inverting input terminal and the inverting input terminal.

Optionally, the reference voltage supply module 223 includes a second diode BP2 and a second discharge circuit 2231, the second diode BP2 is respectively connected to the second discharge circuit 2231 and the blocking unit 210, and the second discharge circuit 2231 is further connected to the non-inverting input terminal of the first comparator U2; the second discharging loop 2231 and the first discharging loop 2211 have different discharging time.

When the second diode BP2 is a normal diode, the anode of the second diode BP2 is connected to the dc blocking unit 210, and the cathode of the second diode BP2 is connected to the positive-phase input terminals of the second discharge circuit 2231 and the first comparator U2, respectively. When the second diode BP2 is a schottky diode, the first end of the second diode BP2 is connected to the dc blocking unit 210, the second end of the second diode BP2 is connected to the second discharging circuit 2231 and the non-inverting input terminal of the first comparator U2, and the third end of the second diode BP2 is grounded.

Further, the level-clamping effect can be achieved by grounding the third terminal of the schottky diode.

Since the discharge time of the first discharge circuit 2211 is different from that of the second discharge circuit 2231, the voltages of the non-inverting input terminal and the inverting input terminal of the first comparator U2 are different from each other, and the comparison by the first comparator U2 can achieve the effect of demodulating the modulated signal.

As an implementation manner, the second discharging circuit 2231 includes a third capacitor C3, a third resistor R3, and a fourth resistor R4, one end of the third capacitor C3 is connected to the second diode BP2 and the third resistor R3, the other end of the third capacitor C3 is grounded, one end of the third resistor R3 is connected to the second triode, the other end of the third resistor R3 is connected to the positive input terminal of the first comparator U2 and one end of the fourth resistor R4, and the other end of the fourth resistor R4 is grounded.

It is understood that the third capacitor C3, the third resistor R3 and the fourth resistor R4 actually form an RC discharge circuit. In addition, the second discharging circuit 2231 of this embodiment has a different discharging time from the first discharging circuit 2211, so that the first comparator U2 can demodulate the modulation signal according to the voltages inputted from the non-inverting input terminal and the inverting input terminal.

In the RC circuit, the product of the resistance value of the resistor and the capacitance value of the capacitor is a time constant, and the smaller the time constant is, the faster the discharge speed of the circuit is. In other words, in order to make the discharging time of the first discharging loop 2211 different from that of the second discharging loop 2231, the parameters in the first discharging loop 2211 are not the same as those in the second discharging loop 2231. For example, the resistance of the second resistor R2 is 10K, the capacitance of the second capacitor C2 is 100pF, the capacitance of the third capacitor C3 is 1nF, the resistance of the third resistor R3 is 47K, and the resistance of the fourth resistor R4 is 47K, so that the discharging time of the first discharging loop 2211 is different from that of the second discharging loop 2231. Of course, in some other embodiments, the first discharge loop 2211 and the second discharge loop 2231 may also have other parameters or more elements, which are not limited herein, for example, the second discharge loop 2231 may further include a capacitor of 47pF, one end of which is connected to the non-inverting input terminal of the first comparator U2, and the other end of which is grounded.

The buffering module 222 is configured to buffer and output a signal output by the first comparator U2, so that the signal is more stable. In one implementation, the buffer module 222 includes a second comparator U3, the reference voltage supply module 223 includes a voltage divider circuit 2232, a non-inverting input terminal of the second comparator U3 is connected to the output terminal of the first comparator U2, an inverting input terminal of the second comparator U3 is connected to the voltage divider circuit 2232, the voltage divider circuit 2232 is further connected to a power supply, and the voltage divider circuit 2232 is configured to provide a stable reference voltage to the non-inverting output terminal of the second comparator U3.

It should be noted that, in order to make the signal input at the non-inverting input terminal of the second comparator U3 more stable, the non-inverting input terminal of the second comparator U3 is further connected to a pull-up resistor, and the pull-up resistor is further connected to a 3.3V power supply.

Optionally, the voltage divider circuit 2232 includes a fifth resistor R5 and a sixth resistor R6, one end of the fifth resistor R5 is connected to the 3.3V power supply, the other end of the fifth resistor R5 is connected to one end of the sixth resistor R6 and the inverting input terminal of the second comparator U3, and the other end of the sixth resistor R6 is grounded. By providing the voltage divider 2232, a stable reference voltage can be provided to the inverting input of the second comparator U3 by using the voltage dividing principle.

Of course, in a possible implementation manner, the voltage divider circuit 2232 may further include other devices, for example, a filter capacitor, and the like, which is not limited in this application.

Optionally, the reference voltage supply module 223 further includes an isolation circuit, and two sides of the isolation resistor R7 are connected to the second discharge circuit 2231 and the voltage divider circuit 2232, respectively. Moreover, the isolation resistor R7 has a larger resistance value, for example, the isolation resistor R7 has a resistance value of 2M, so that the second discharging circuit 2231 and the voltage dividing circuit 2232 are approximately open, the second discharging circuit 2231 does not affect the voltage dividing circuit 2232, and the stability of the circuit is higher.

Based on the above implementation, the present application also provides a power line including the above signal transmission circuit, in other words, the modulation circuit 110 and/or the demodulation circuit 200 may be integrated on the power line.

For example, referring to fig. 3, when the device a needs to obtain data from the device B, the device B is connected to the power supply through the power adapter, and at this time, the data acquisition can be realized only by connecting the device a to the power line, so that an additional data line is not needed, and the wiring is simpler.

As another implementation, the present application also provides an apparatus including the signal transmission circuit described above.

Therefore, in the present application, when the device a needs to acquire data from the device B, as a first implementation manner, the modulation circuit 110 and the demodulation circuit 200 may be integrated on the power line at the same time, and on this basis, neither the device a nor the device B needs to integrate the modulation circuit 110 or the demodulation circuit 200. As a second implementation manner, only the modulation circuit 110 may be integrated on the power line, and on this basis, the modulation circuit 110 is not required to be integrated in the device B, and the demodulation circuit 200 is integrated in the device a. As a third implementation, only the demodulation circuit 200 may be integrated on the power line, and on this basis, the modulation circuit 110 is integrated in the device B, and the demodulation circuit 200 is not integrated in the device a.

In summary, the embodiment of the present application provides a signal transmission circuit, a power line and a device, where the signal transmission circuit is connected to an anode of a dc power line, and the signal transmission circuit includes a modulation circuit and/or a demodulation circuit, where the modulation circuit includes a modulation chip, and the modulation chip is configured to receive an input signal, generate a modulation signal according to the input signal, and output the modulation signal through the anode of the power line; the demodulation circuit comprises a blocking unit and a demodulation unit, wherein the blocking unit is respectively connected with the demodulation unit and the anode of the power line and is used for isolating the direct current signal of the anode of the power line and outputting a modulation signal; the demodulation unit is used for demodulating and outputting the modulation signal. Because the power line is adopted to realize the transmission of signals, no additional signal line is needed, and the circuit between the devices is simpler.

The above description is only for various embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present application, and all such changes or substitutions are included in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.