Power line carrier self-coupling isolation circuit and isolator

Abstract

The utility model provides a power line carrier self-coupling isolation circuit and an isolator. The power line carrier self-coupling isolation circuit comprises a first isolation circuit, a first signal coupling circuit, a second isolation circuit, a second signal coupling circuit and a power line carrier control gateway. The input end of the first isolation circuit is connected with an external power supply, and the output end is connected with the input end of the first signal coupling circuit. The first signal coupling circuit is also connected with the output end of the power line carrier control gateway, and the output end is connected with the output end of the second isolation circuit; the output end of the second isolation circuit is connected with the input end of a second signal coupling circuit, and the output end of the second signal coupling circuit is used for being connected with another isolation circuit. According to the power line carrier self-coupling isolation circuit, the power line carrier control gateway is connected with the terminal devices in the multiple isolation circuits, so that control over each terminal device is achieved, the number of the connected terminal devices can be expanded, limitation of a single isolation circuit is avoided, and the expansibility and applicability of the power line carrier self-coupling isolation circuit are improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of power carrier isolators, and in particular to a power line carrier self-coupling isolation circuit and an isolator. BACKGROUND

[0002] In the current field of power carrier communication technology, the isolator as a key component is mainly used to isolate strong electric interference and ensure stable transmission of the power carrier signal. However, the existing power carrier isolator does not have a signal coupling function, thereby limiting the application scenarios of the power carrier isolator. Due to the power limitation of the power carrier isolator, the number of sub-devices that can be accommodated by each power carrier isolator is limited, thereby causing the isolator to be mainly applicable to small engineering projects.

[0003] For example, the prior art document CN202311484358.1 discloses an active power line carrier signal isolator, which includes a carrier signal detection circuit, a voltage inverse driving amplification circuit, a coupling circuit and an attenuation isolation circuit. The carrier signal detection circuit extracts the carrier signal from the power line through a capacitor and a magnetic ring and performs preliminary filtering processing. The extracted carrier signal is sent to the voltage inverse driving amplification circuit, which is composed of a high-speed operational amplifier and a power amplifier. The high-speed operational amplifier inverts the signal, and then the power amplifier performs power amplification. The inverted signal after amplification is coupled back to the attenuation isolation circuit part in the power line through the coupling circuit. The inverted signal coupled back meets the original carrier signal on the power line, and since they are opposite in phase and similar in size, they will cancel each other out, thereby realizing the isolation of the carrier signal. However, the number of sub-devices that can be accommodated by the power carrier isolator in this scheme is limited, and it is difficult to apply to the application scenarios of large engineering projects. UTILITY MODEL CONTENT

[0004] The purpose of the present disclosure is to overcome the deficiencies in the prior art and provide a power line carrier self-coupling isolation circuit and an isolator that can couple multiple isolators.

[0005] The purpose of the present disclosure is achieved by the following technical solutions:

[0006] A power line carrier self-coupling isolation circuit, comprising a first isolation circuit, a first signal coupling circuit, a second isolation circuit, a second signal coupling circuit and a power line carrier control gateway.

[0007] The input end of the first isolation circuit and the input end of the second isolation circuit are used to be connected with the external power supply end, the output end of the first isolation circuit is connected with the input end of the first signal coupling circuit and the input end of the power line carrier control gateway respectively, the input end of the first signal coupling circuit is connected with the output end of the power line carrier control gateway, the output end of the first signal coupling circuit is connected with the output end of the second isolation circuit, the output end of the second isolation circuit is also connected with the input end of the second signal coupling circuit, and the output end of the second signal coupling circuit is used to be connected with the output end of another isolation circuit, so that the power line carrier control gateway is connected with multiple isolation circuits through the second signal coupling circuit.

[0008] In one of the embodiments, the first isolation circuit comprises an isolation transformer and a first capacitor, the zero line input end and the fire wire input end of the isolation transformer are used to be connected with the external power supply end, one end of the first capacitor is connected with the zero line input end of the isolation transformer, and the other end of the first capacitor is connected with the fire wire input end of the isolation transformer, and the zero line output end and the fire wire output end of the isolation transformer are connected with the zero line input end and the fire wire input end of the first signal coupling circuit respectively.

[0009] In one of the embodiments, the first isolation circuit further comprises a second capacitor, one end of the second capacitor is connected with the zero line output end of the isolation transformer, and the other end of the second capacitor is connected with the fire wire output end of the isolation transformer.

[0010] In one of the embodiments, the first isolation circuit further comprises a first filter inductor, one end of the first filter inductor is connected with the zero line output end of the isolation transformer, and the other end of the first filter inductor is connected with the zero line input end of the first signal coupling circuit.

[0011] In one of the embodiments, the first isolation circuit further comprises a second filter inductor, one end of the second filter inductor is connected with the fire wire output end of the isolation transformer, and the other end of the second filter inductor is connected with the fire wire input end of the first signal coupling circuit.

[0012] In one of the embodiments, the first signal coupling circuit comprises a coupling transformer and a third capacitor, the zero line input end of the coupling transformer is connected with the zero line output end of the isolation transformer, the fire wire input end of the coupling transformer is connected with the fire wire output end of the isolation transformer, one end of the third capacitor is connected with the zero line output end of the isolation transformer, and the other end of the third capacitor is connected with the zero line input end of the coupling transformer.

[0013] In one of the embodiments, the first signal coupling circuit further comprises a fourth capacitor, one end of the fourth capacitor is connected with the live output end of the isolation transformer, and the other end of the fourth capacitor is connected with the live input end of the coupling transformer.

[0014] In one of the embodiments, the first signal coupling circuit further comprises a fifth capacitor, one end of the fifth capacitor is connected with the zero output end of the coupling transformer, and the other end of the fifth capacitor is connected with the zero output end of the first signal coupling circuit.

[0015] In one of the embodiments, the first signal coupling circuit further comprises a sixth capacitor, one end of the sixth capacitor is connected with the live output end of the coupling transformer, and the other end of the sixth capacitor is connected with the live output end of the first signal coupling circuit.

[0016] An isolator comprising the power line carrier self-coupling isolation circuit as claimed in any one of the above.

[0017] Compared with the prior art, the present disclosure has at least the following advantages:

[0018] 1. The power line carrier self-coupling isolation circuit as claimed in the above, the power line carrier control gateway is connected with the terminal device in the power line carrier signal loop of each of the plurality of isolation circuits through the signal coupling circuit, so that the power line carrier control gateway can control each of the terminal devices in the plurality of power line carrier signal loops, thereby making the power line carrier self-coupling isolation circuit not limited by the number of the single isolation circuit, and enabling the single power line carrier control gateway to control the plurality of terminal devices, and further improving the expansibility and applicability of the power line carrier self-coupling isolation circuit, while reducing the use cost of the power line carrier self-coupling isolation circuit. On the other hand, the power line carrier self-coupling isolation circuit effectively isolates the strong electric interference of the external power supply through the isolation circuit, thereby improving the stability of the power line carrier self-coupling isolation circuit. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present disclosure, and therefore should not be considered as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0020] Figure 1 The structural schematic diagram of the power line carrier self-coupling isolation circuit and the isolator of an embodiment;

[0021] Figure 2 The structural schematic diagram of the power line carrier self-coupling isolation circuit and the isolator of an embodiment; Figure 1A circuit diagram of the power line carrier self-coupling isolation circuit and the isolator is shown in the figure.

[0022] Figure 3 For Figure 2 A partial circuit diagram of the power line carrier self-coupling isolation circuit and the isolator is shown in the figure. DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the accompanying drawings. The preferred embodiments of the present disclosure are shown in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thorough and comprehensive.

[0024] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure belongs. The terminology used in the description of the present disclosure herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0026] In order to better understand the technical solutions and beneficial effects of the present disclosure, the present disclosure will be further described in detail below in conjunction with specific embodiments:

[0027] As Figures 1 to 3 A power line carrier self-coupling isolation circuit 10 of an embodiment of the present disclosure includes a first isolation circuit 100, a first signal coupling circuit 200, a second isolation circuit 300, a second signal coupling circuit 400, and a power line carrier control gateway CCO, as shown in the figure.

[0028] The input end of the first isolation circuit 100 and the input end of the second isolation circuit 300 are used to connect with the power supply end of an external power supply, the output end of the first isolation circuit 100 is connected with the input end of the first signal coupling circuit 200 and the input end of the power line carrier control gateway CCO respectively, the input end of the first signal coupling circuit 200 is connected with the output end of the power line carrier control gateway CCO, the output end of the first signal coupling circuit 200 is connected with the output end of the second isolation circuit 300, the output end of the second isolation circuit 300 is also connected with the input end of the second signal coupling circuit 400, and the output end of the second signal coupling circuit 400 is used to connect with the output end of another isolation circuit, so that the power line carrier control gateway CCO is connected with multiple isolation circuits through the second signal coupling circuit 400.

[0029] In the embodiment, when the external power supply is connected with the input end of the first isolation circuit 100, the first isolation circuit 100 filters out the interference signal contained in the alternating current input by the external power supply, allows the power line carrier signal to pass through, and then outputs to the power line carrier control gateway CCO, so that the power line carrier control gateway CCO and the terminal equipment STA connected with the first isolation circuit 100 form a first power line carrier signal loop, and then the power line carrier control gateway CCO transmits the power line carrier control signal to the power line carrier signal loop through the zero line and the fire wire output end, so as to control the terminal equipment STA on the first power line carrier loop. Then, since the input end of the first signal coupling circuit 200 is connected with the output end of the first isolation circuit 100, and the output end is connected with the output end of the second isolation circuit 300, the power line carrier control gateway CCO and the terminal equipment STA on the second isolation circuit 300 form a second power line carrier signal loop, so that the power line carrier control gateway CCO can control the terminal equipment STA on the second power line carrier signal loop. Further, since the output end of the second isolation circuit is connected with the input end of the second signal coupling circuit 400, and the output end of the second signal coupling circuit 400 can be extended to connect with the output end of another isolation circuit, the power line carrier control gateway CCO can control the terminal equipment STA of another isolation circuit, and further, the power line carrier control gateway CCO can control each terminal equipment STA in multiple isolation circuits.

[0030] The power line carrier self-coupling isolation circuit 10 and the power line carrier control gateway CCO are connected to the terminal device STA in the power line carrier signal loop of each isolation circuit through the signal coupling circuit, so that the power line carrier control gateway CCO can control each terminal device STA in the power line carrier signal loop, thereby the power line carrier self-coupling isolation circuit 10 is not limited by the number of single isolation circuit, and can control multiple terminal devices STA through a single power line carrier control gateway CCO, thereby improving the expansibility and applicability of the power line carrier self-coupling isolation circuit 10, and reducing the use cost of the power line carrier self-coupling isolation circuit 10. On the other hand, the power line carrier self-coupling isolation circuit 10 effectively isolates the strong electric interference of the external power supply through the isolation circuit, thereby improving the stability of the power line carrier self-coupling isolation circuit 10.

[0031] As shown in Figure 2 and Figure 3 In one embodiment, the first isolation circuit 100 includes an isolation transformer LF1 and a first capacitor CX1. The zero line and the live line input terminals of the isolation transformer LF1 are connected to the external power supply terminal. One end of the first capacitor CX1 is connected to the zero line input terminal of the isolation transformer LF1, and the other end of the first capacitor CX1 is connected to the live line input terminal of the isolation transformer LF1. The zero line and the live line output terminals of the isolation transformer LF1 are connected to the zero line and the live line input terminals of the first signal coupling circuit 200, respectively. In this embodiment, the isolation transformer LF1 can electrically isolate the external power supply terminal from the subsequent circuit, thereby effectively blocking the propagation path of the strong electric interference signal, and ensuring that the power line carrier signal can pass through the first isolation circuit 100 and be transmitted to the power line carrier control gateway CCO. At the same time, the first capacitor CX1 is connected in parallel between the zero line and the live line of the input terminal of the isolation transformer LF1 to filter out high-frequency noise and clutter in the power supply. Therefore, through the filtering effect of the first capacitor CX1, the high-frequency noise and clutter interference is effectively reduced, thereby improving the accuracy and stability of the power line carrier signal transmission.

[0032] As shown in Figure 2 and Figure 3As shown in one of the embodiments, the first isolation circuit 100 further comprises a second capacitor CX2, one end of the second capacitor CX2 is connected to the zero line output end of the isolation transformer LF1, and the other end of the second capacitor CX2 is connected to the live line output end of the isolation transformer LF1. In this embodiment, the second capacitor CX2 is connected in parallel between the zero line and the live line output ends of the isolation transformer LF1. The second capacitor CX2 can absorb and suppress high-frequency noise or transient voltage spikes generated from the output end of the isolation transformer LF1, so as to ensure that the power line carrier signal is more stably output to the input end of the first signal coupling circuit 200 and the power line carrier control gateway CCO, thereby realizing effective control over the terminal device STA.

[0033] As shown in one of the embodiments, the first isolation circuit 100 further comprises a second capacitor CX2, one end of the second capacitor CX2 is connected to the zero line output end of the isolation transformer LF1, and the other end of the second capacitor CX2 is connected to the live line output end of the isolation transformer LF1. In this embodiment, the second capacitor CX2 is connected in parallel between the zero line and the live line output ends of the isolation transformer LF1. The second capacitor CX2 can absorb and suppress high-frequency noise or transient voltage spikes generated from the output end of the isolation transformer LF1, so as to ensure that the power line carrier signal is more stably output to the input end of the first signal coupling circuit 200 and the power line carrier control gateway CCO, thereby realizing effective control over the terminal device STA. Figure 2 Figure 3 As shown in one of the embodiments, the first isolation circuit 100 further comprises a first filter inductor L1, one end of the first filter inductor L1 is connected to the zero line output end of the isolation transformer LF1, and the other end of the first filter inductor L1 is connected to the zero line input end of the first signal coupling circuit 200. In this embodiment, the first filter inductor L1 is connected in series between the zero line output end of the isolation transformer LF1 and the zero line input end of the first signal coupling circuit 200. The first filter inductor L1 can effectively block low-frequency noise and ripple current by its inductive property. Specifically, when a signal containing low-frequency noise or ripple current passes through the filter inductor, the first filter inductor L1 will generate a reverse electromotive force to offset or weaken the interference signal, so that the signal output to the first signal coupling circuit 200 is more stable. When transient voltage changes or current surges occur in the circuit, the first filter inductor L1 can absorb part of the energy and slow down the rate of voltage and current change, thereby ensuring that the first signal coupling circuit 200 is not damaged by overvoltage or overcurrent.

[0034] As shown in one of the embodiments, the first isolation circuit 100 further comprises a second capacitor CX2, one end of the second capacitor CX2 is connected to the zero line output end of the isolation transformer LF1, and the other end of the second capacitor CX2 is connected to the live line output end of the isolation transformer LF1. In this embodiment, the second capacitor CX2 is connected in parallel between the zero line and the live line output ends of the isolation transformer LF1. The second capacitor CX2 can absorb and suppress high-frequency noise or transient voltage spikes generated from the output end of the isolation transformer LF1, so as to ensure that the power line carrier signal is more stably output to the input end of the first signal coupling circuit 200 and the power line carrier control gateway CCO, thereby realizing effective control over the terminal device STA. Figure 2 Figure 3 ​​As shown, in one embodiment, the first isolation circuit 100 further comprises a second filter inductor L2, one end of the second filter inductor L2 is connected to the live output end of the isolation transformer LF1, and the other end of the second filter inductor L2 is connected to the live input end of the first signal coupling circuit 200. In this embodiment, the second filter inductor L2 is connected in series between the live output end of the isolation transformer LF1 and the live input end of the first signal coupling circuit 200. The second filter inductor L2 can effectively block low-frequency noise and ripple current through its inductive properties. Specifically, when a signal containing low-frequency noise or ripple current passes through the filter inductor, the second filter inductor L2 will generate a reverse electromotive force to offset or weaken the interference signal, so that the signal output to the first signal coupling circuit 200 is more stable. When transient voltage changes or current surges occur in the circuit, the second filter inductor L2 can absorb part of the energy to slow down the rate of voltage and current change, thereby ensuring that the first signal coupling circuit 200 is not damaged by overvoltage or overcurrent.

[0035] As shown in Figure 2 and Figure 3 As shown, in one embodiment, the first signal coupling circuit 200 comprises a coupling transformer T1 and a third capacitor CX3, the neutral input end of the coupling transformer T1 is connected to the neutral output end of the isolation transformer LF1, the live input end of the coupling transformer T1 is connected to the live output end of the isolation transformer LF1, one end of the third capacitor CX3 is connected to the neutral output end of the isolation transformer LF1, and the other end of the third capacitor CX3 is connected to the neutral input end of the coupling transformer T1. In this embodiment, since the coupling transformer T1 has the characteristic of electrical isolation to prevent noise signal interference, the coupling transformer T1 efficiently transmits the power line carrier signal output by the first isolation circuit 100 to the output end of the first signal coupling circuit 200, thereby enhancing the safety and stability of the first signal coupling circuit 200. The third capacitor CX3 is connected between the neutral input end of the coupling transformer T1 and the neutral output end of the isolation transformer LF1 to absorb and suppress high-frequency noise in the power line carrier signal. Specifically, when the power line carrier signal containing high-frequency noise or clutter passes through the third capacitor CX3, the capacitor absorbs and suppresses the high-frequency signal through its charge and discharge characteristics, thereby allowing stable power line carrier signals to pass, thereby improving the stability of the first signal coupling circuit 200.

[0036] As shown in Figure 2 and Figure 3As shown in FIG. 1, in one embodiment, the first signal coupling circuit 200 further comprises a fourth capacitor CX5, one end of the fourth capacitor CX5 is connected to the live wire output end of the isolation transformer LF1, and the other end of the fourth capacitor CX5 is connected to the live wire input end of the coupling transformer T1. In this embodiment, the fourth capacitor CX5 uses its charge and discharge characteristics to absorb and suppress the high-frequency noise in the power line carrier signal transmitted through the live wire. Specifically, when the power line carrier signal on the live wire carries high-frequency noise or clutter through the fourth capacitor CX5, the capacitor will quickly charge and discharge, effectively attenuating the high-frequency signal and ensuring that the power line carrier signal is stably transmitted to the live wire input end of the coupling transformer T1. On the other hand, the fourth capacitor CX5 also enhances the anti-interference ability of the entire circuit system, further improving the stability and reliability of the first signal coupling circuit 200.

[0037] As shown in FIG. 1, in one embodiment, the first signal coupling circuit 200 further comprises a fourth capacitor CX5, one end of the fourth capacitor CX5 is connected to the live wire output end of the isolation transformer LF1, and the other end of the fourth capacitor CX5 is connected to the live wire input end of the coupling transformer T1. In this embodiment, the fourth capacitor CX5 uses its charge and discharge characteristics to absorb and suppress the high-frequency noise in the power line carrier signal transmitted through the live wire. Specifically, when the power line carrier signal on the live wire carries high-frequency noise or clutter through the fourth capacitor CX5, the capacitor will quickly charge and discharge, effectively attenuating the high-frequency signal and ensuring that the power line carrier signal is stably transmitted to the live wire input end of the coupling transformer T1. On the other hand, the fourth capacitor CX5 also enhances the anti-interference ability of the entire circuit system, further improving the stability and reliability of the first signal coupling circuit 200. Figure 2 Figure 3 As shown in FIG. 1, in one embodiment, the first signal coupling circuit 200 further comprises a fifth capacitor CX4, one end of the fifth capacitor CX4 is connected to the neutral wire output end of the coupling transformer T1, and the other end of the fifth capacitor CX4 is connected to the neutral wire output end of the first signal coupling circuit 200. The fifth capacitor CX4 is connected between the neutral wire output end of the coupling transformer T1 and the neutral wire output end of the first signal coupling circuit 200, so that the fifth capacitor CX4 can absorb and suppress the high-frequency noise of the power line carrier signal output from the coupling transformer T1. When the power line carrier signal output from the coupling transformer T1 carries high-frequency noise or clutter, the fifth capacitor CX4 will use its charge and discharge characteristics to quickly absorb and attenuate these high-frequency components, thereby ensuring more stable transmission of the power line carrier signal. In addition, the fifth capacitor CX4 also helps to smooth the signal waveform, reduces the fluctuation and distortion of the signal during transmission, and thus improves the transmission quality of the power line carrier signal.

[0038] As shown in FIG. 1, in one embodiment, the first signal coupling circuit 200 further comprises a sixth capacitor CX6, one end of the sixth capacitor CX6 is connected to the live wire output end of the coupling transformer T1, and the other end of the sixth capacitor CX6 is connected to the live wire output end of the first signal coupling circuit 200. In this embodiment, when the power line carrier signal output from the coupling transformer T1 is transmitted on the live wire, the sixth capacitor CX6 can absorb and suppress the high-frequency noise through its charge and discharge characteristics, thereby ensuring more stable transmission of the power line carrier signal. In addition, the sixth capacitor CX6 also helps to improve the ability of the first signal coupling circuit 200 to withstand transient voltage changes, and absorbs the energy of transient voltage changes in the circuit to slow down the rate of voltage change, thereby protecting the subsequent circuit from overvoltage damage. Figure 2 Figure 3 Figure 2 Figure 3 As shown in FIG. 1, in one embodiment, the first signal coupling circuit 200 further comprises a sixth capacitor CX6, one end of the sixth capacitor CX6 is connected to the live wire output end of the coupling transformer T1, and the other end of the sixth capacitor CX6 is connected to the live wire output end of the first signal coupling circuit 200. In this embodiment, when the power line carrier signal output from the coupling transformer T1 is transmitted on the live wire, the sixth capacitor CX6 can absorb and suppress the high-frequency noise through its charge and discharge characteristics, thereby ensuring more stable transmission of the power line carrier signal. In addition, the sixth capacitor CX6 also helps to improve the ability of the first signal coupling circuit 200 to withstand transient voltage changes, and absorbs the energy of transient voltage changes in the circuit to slow down the rate of voltage change, thereby protecting the subsequent circuit from overvoltage damage.

[0039] ​​The isolator comprises the power line carrier self-coupling isolation circuit 10 of any one of the above. In the embodiment, when the external power supply is connected to the input end of the first isolation circuit 100, the first isolation circuit 100 filters out the interference signals contained in the alternating current input by the external power supply, allows the power line carrier signal to pass through, and then outputs to the power line carrier control gateway CCO, so that the power line carrier control gateway CCO and the terminal equipment STA connected with the first isolation circuit 100 form a first power line carrier signal loop, and then the power line carrier control gateway CCO transmits the power line carrier control signal to the power line carrier signal loop through the zero line and the fire wire output end, so as to control the terminal equipment STA on the first power line carrier loop. Then, since the input end of the first signal coupling circuit 200 is connected with the output end of the first isolation circuit 100, and the output end is connected with the output end of the second isolation circuit 300, the power line carrier control gateway CCO and the terminal equipment STA on the second isolation circuit 300 form a second power line carrier signal loop, so that the power line carrier control gateway CCO can control the terminal equipment STA on the second power line carrier signal loop. Further, since the output end of the second isolation circuit is connected with the input end of the second signal coupling circuit 400, and the output end of the second signal coupling circuit 400 is extendedly connected with the output end of another isolation circuit, the power line carrier control gateway CCO can control the terminal equipment STA of another isolation circuit, and further, the power line carrier control gateway CCO can control each terminal equipment STA in the plurality of isolation circuits.

[0040] Compared with the prior art, the present disclosure has at least the following advantages:

[0041] 1. The power line carrier self-coupling isolation circuit 10 described above, the power line carrier control gateway CCO is connected with the terminal equipment STA in the power line carrier signal loop of the plurality of isolation circuits through the signal coupling circuit respectively, so that the power line carrier control gateway CCO can control each terminal equipment STA in the plurality of power line carrier signal loops respectively, thereby the power line carrier self-coupling isolation circuit 10 is not limited by the number of single isolation circuit, and can control a plurality of terminal equipment STAs through a single power line carrier control gateway CCO, thereby improving the expansibility and applicability of the power line carrier self-coupling isolation circuit 10, and reducing the use cost of the power line carrier self-coupling isolation circuit 10. On the other hand, the power line carrier self-coupling isolation circuit 10 effectively isolates the strong electric interference of the external power supply through the isolation circuit, thereby improving the stability of the power line carrier self-coupling isolation circuit 10.

[0042] The above-described embodiments are merely illustrative of several embodiments of the present disclosure, which are described in a more specific and detailed manner, but should not be construed as limiting the scope of the patent disclosure. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the patent of the present disclosure should be subject to the appended claims.

Claims

1. A power line carrier self-coupling isolation circuit, characterized in that, It includes a first isolation circuit, a first signal coupling circuit, a second isolation circuit, a second signal coupling circuit, and a power line carrier control gateway. The input terminals of the first isolation circuit and the second isolation circuit are used to connect to an external power supply terminal. The output terminal of the first isolation circuit is connected to the input terminal of the first signal coupling circuit and the input terminal of the power line carrier control gateway, respectively. The input terminal of the first signal coupling circuit is connected to the output terminal of the power line carrier control gateway. The output terminal of the first signal coupling circuit is connected to the output terminal of the second isolation circuit. The output terminal of the second isolation circuit is also connected to the input terminal of the second signal coupling circuit. The output terminal of the second signal coupling circuit is used to connect to the output terminal of another isolation circuit, so that the power line carrier control gateway is connected to multiple isolation circuits through the second signal coupling circuit.

2. The power line carrier self-coupling isolation circuit according to claim 1, characterized in that, The first isolation circuit includes an isolation transformer and a first capacitor. The neutral input terminal and the live input terminal of the isolation transformer are both used to connect to the external power supply terminal. One end of the first capacitor is connected to the neutral input terminal of the isolation transformer, and the other end of the first capacitor is connected to the live input terminal of the isolation transformer. The neutral output terminal and the live output terminal of the isolation transformer are respectively connected to the neutral input terminal and the live input terminal of the first signal coupling circuit.

3. The power line carrier self-coupling isolation circuit according to claim 2, characterized in that, The first isolation circuit also includes a second capacitor, one end of which is connected to the neutral output terminal of the isolation transformer, and the other end of which is connected to the live output terminal of the isolation transformer.

4. The power line carrier self-coupling isolation circuit according to claim 2, characterized in that, The first isolation circuit further includes a first filter inductor, one end of which is connected to the neutral output terminal of the isolation transformer, and the other end of which is connected to the neutral input terminal of the first signal coupling circuit.

5. The power line carrier self-coupling isolation circuit according to claim 4, characterized in that, The first isolation circuit further includes a second filter inductor, one end of which is connected to the live wire output terminal of the isolation transformer, and the other end of which is connected to the live wire input terminal of the first signal coupling circuit.

6. The power line carrier self-coupling isolation circuit according to claim 2, characterized in that, The first signal coupling circuit includes a coupling transformer and a third capacitor. The neutral input terminal of the coupling transformer is connected to the neutral output terminal of the isolation transformer, the live input terminal of the coupling transformer is connected to the live output terminal of the isolation transformer, one end of the third capacitor is connected to the neutral output terminal of the isolation transformer, and the other end of the third capacitor is connected to the neutral input terminal of the coupling transformer.

7. The power line carrier self-coupling isolation circuit according to claim 6, characterized in that, The first signal coupling circuit further includes a fourth capacitor, one end of which is connected to the live wire output terminal of the isolation transformer, and the other end of which is connected to the live wire input terminal of the coupling transformer.

8. The power line carrier self-coupling isolation circuit according to claim 6, characterized in that, The first signal coupling circuit further includes a fifth capacitor, one end of which is connected to the neutral output terminal of the coupling transformer, and the other end of which is connected to the neutral output terminal of the first signal coupling circuit.

9. The power line carrier self-coupling isolation circuit according to claim 8, characterized in that, The first signal coupling circuit further includes a sixth capacitor, one end of which is connected to the live wire output terminal of the coupling transformer, and the other end of which is connected to the live wire output terminal of the first signal coupling circuit.

10. An isolator, characterized in that, Includes the power line carrier self-coupling isolation circuit as described in any one of claims 1 to 9 above.

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