A PLC signal isolation coupler

Abstract

The present invention discloses a PLC signal isolation coupler, comprising a coupling coil, a safety capacitor and a differential mode inductor; the input end of the isolation coupler is an AC input end, which is connected to a PLC power grid, the input end of the coupling coil is respectively connected to a live wire La and a neutral wire Na, a safety capacitor is connected in series between the live wire La and the coupling coil, the output end of the coupling coil is connected to a DC output end, the DC output end is connected to N lamp PLC dimming modules, and one end of each lamp PLC adjustment module is connected to an LED lamp; the input end of a common constant voltage switching power supply is connected in parallel to the input end of the isolation coupler, and the output end of the common constant voltage switching power supply is connected in parallel to the output end of the isolation coupler; the transmission of the PLC signal from the AC input end to the DC output end is realized by connecting the PLC signal isolation coupler with the common constant voltage power supply and the lamp PLC dimming module.

Description

Technical Field

[0001] The present invention relates to the field of whole-house interconnection intelligence, and more specifically, to a PLC signal isolation coupler. Background Art

[0002] Power lines were originally designed to transmit electrical energy rather than signals (including analog and digital signals). Their channel characteristics are not good for communication. They are not general and time-varying, and the link impedance varies greatly. The unshielded and untwisted packaging makes it easy for external electromagnetic interference to invade. Based on this, PLC-IoT communication equipment, including CCO and STA, uses OFDM to improve the signal modulation and demodulation capabilities on power lines. PLC-IoT communication equipment uses a multi-carrier OFDM communication system to carry data signals on single-phase power lines, which is currently the most effective carrier method.

[0003] In the wiring of the whole-house interconnected intelligent lighting system, it is necessary to isolate the PLC signal in the PLC intelligent control grid from the ordinary lighting appliance switch power supply, and at the same time couple the PLC signal at the AC input end of the switch power supply to the DC output end, and inject the PLC signal into the DC input port of the PLC dimming control module of the lamp. This function can be achieved by adding a PLC isolation coupler to the outside of the ordinary constant voltage power supply. Summary of the invention

[0004] In order to solve at least one of the above technical problems, the present invention proposes a PLC signal isolation coupler.

[0005] A first aspect of the present invention provides a PLC signal isolation coupler, comprising: a differential mode inductor, a safety capacitor and a PLC signal coupling coil;

[0006] The input end of the isolation coupler is an AC input end (PLC.220VAC), which is connected to the PLC power grid. The input end of the isolation coupler is respectively connected to the live wire La and the neutral wire Na. A safety capacitor C1 is connected in series between the live wire La and the pin 5 of the coupling coil T1. Another safety capacitor C2 is connected in series between the output pin 4 of the coupling coil T1 and the positive pole of the DC output end (PLC.DC). The DC output end (PLC.DC) is connected to the input ends of N lamp PLC dimming modules, and the other end of each lamp PLC dimming module is connected to an LED lamp.

[0007] The live wire Lb and the neutral wire Nb of the input end (POWER.220VAC) of the common constant-voltage switching power supply are respectively connected in series to the live wire La and the neutral wire Na of the AC input end (PLC.220VAC) of the isolation coupler through differential-mode inductors L1 and L2; the positive and negative electrodes of the output end (POWER.DC) of the common constant-voltage switching power supply are respectively connected in series to the positive and negative electrodes of the output end (PLC.DC) of the isolation coupler through differential-mode inductors L3 and L4;

[0008] By connecting the PLC signal isolation coupler with the ordinary constant voltage power supply and the PLC dimming module of the lamp, the transmission of the PLC signal from the AC input end (PLC.220VAC) to the DC output end (PLC.DC) is realized, and at the same time, the safety capacitor at the input end of the ordinary constant voltage power supply eliminates the interference of the PLC signal absorption in the PLC power grid.

[0009] In a preferred embodiment of the present invention, the N lamp PLC dimming modules are respectively recorded as lamp PLC dimming module 1, lamp PLC dimming module 2... lamp PLC dimming module N, and the N lamp PLC dimming modules are connected in parallel.

[0010] In a preferred embodiment of the present invention, the input end of the isolation coupler is the alternating current of the PLC power grid (PLC.220V).

[0011] In a preferred embodiment of the present invention, the live wire La is connected to a differential mode inductor L1, the other end of the differential mode inductor L1 is connected to a live wire terminal Lb of a common constant voltage power supply, the neutral wire Na is connected to a differential mode inductor L2, the other end of the differential mode inductor L2 is connected to a neutral wire terminal Nb of a common constant voltage power supply.

[0012] In a preferred embodiment of the present invention, the live wire Lb and the neutral wire Nb are connected to the AC input end of a common constant voltage power supply.

[0013] In a preferred embodiment of the present invention, the positive electrode and the negative electrode of the output end of the isolation coupler are respectively connected to the positive electrode and the negative electrode of the input end of the dimming module.

[0014] In a preferred embodiment of the present invention, the positive pole of the isolation coupler output terminal (PLC.DC) is connected to the differential mode inductor L3, the other end of the differential mode inductor L3 is connected to the positive pole of the DC output terminal (POWER.DC) of a common constant voltage power supply, the negative pole of the isolation coupler output terminal (PLC.DC) is connected to the differential mode inductor L4, the other end of the differential mode inductor L4 is connected to the negative pole of the DC output terminal (POWER.DC) of the common constant voltage power supply.

[0015] The above technical solution of the present invention has the following advantages compared with the prior art:

[0016] (1) It eliminates the problem of interference of the safety capacitor connected in parallel to the neutral and live wires at the AC input end of the switching power supply of ordinary lighting appliances with the PLC communication frequency band signal. At the same time, it solves the problem of coupling the PLC signal at the AC input end of the switching power supply to the DC output end, injecting the PLC signal into the DC input port of the PLC dimming control module of the lamp, and realizing intelligent control of the light of the lamp.

[0017] (2) By connecting the PLC signal isolation coupler with the ordinary constant voltage power supply and the PLC dimming module (DC to DC) of the lamp, the PLC signal can be transmitted from the AC input end to the DC output end, thereby realizing the ability to use an ordinary constant voltage power supply to control the lighting of a single or multiple lamps' dimming modules (DC to DC). At the same time, compared with using a separate driving power supply for each lamp, the total equipment cost is saved, because the ordinary constant voltage power supply can make the power consumption relatively high and can drive the dimming modules of several lamps at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, some of the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a principle block diagram of the PLC isolation coupler of the present invention;

[0020] Figure 2 It is a schematic diagram of an application scenario of a PLC signal isolation coupler according to an embodiment of the present invention. DETAILED DESCRIPTION

[0021] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0022] In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention.

[0023] However, the present invention may also be implemented in other ways than those described herein.

[0024] Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0025] Embodiment 1

[0026] See also Figure 1-2As shown, a PLC signal isolation coupler includes: a coupling coil, a safety capacitor, and a differential mode inductor;

[0027] The input end of the isolation coupler is an AC input end (PLC.220VAC), which is connected to the PLC power grid. The input end of the isolation coupler is respectively connected to the live wire La and the neutral wire Na. A safety capacitor C1 is connected in series between the live wire La and the pin 5 of the coupling coil T1. Another safety capacitor C2 is connected in series between the output pin 4 of the coupling coil T1 and the positive pole of the DC output end (PLC.DC). The DC output end (PLC.DC) is connected to the input ends of N lamp PLC dimming modules, and the other end of each lamp PLC dimming module is connected to an LED lamp.

[0028] The live wire Lb and the neutral wire Nb of the input end (POWER.220VAC) of the common constant-voltage switching power supply are respectively connected in series to the live wire La and the neutral wire Na of the AC input end (PLC.220VAC) of the isolation coupler through differential-mode inductors L1 and L2; the positive and negative electrodes of the output end (POWER.DC) of the common constant-voltage switching power supply are respectively connected in series to the positive and negative electrodes of the output end (PLC.DC) of the isolation coupler through differential-mode inductors L3 and L4;

[0029] By connecting the PLC signal isolation coupler with the ordinary constant voltage power supply and the PLC dimming module of the lamp, the transmission of the PLC signal from the AC input end (PLC.220VAC) to the DC output end (PLC.DC) is realized.

[0030] Furthermore, the N lamp PLC dimming modules are respectively recorded as lamp PLC dimming module 1, lamp PLC dimming module 2, ... lamp PLC dimming module N, and the N lamp PLC dimming modules are connected in parallel.

[0031] Furthermore, the input end of the isolation coupler is (PLC.220V) alternating current.

[0032] Furthermore, the live wire La is connected to a differential mode inductor L1, the other end of the differential mode inductor L1 is connected to a live wire Lb, the neutral wire Na is connected to a differential mode inductor L2, the other end of the differential mode inductor L2 is connected to a neutral wire Nb.

[0033] Furthermore, the live wire Lb and the neutral wire Nb are connected to the AC input terminal of a common constant voltage power supply.

[0034] The positive pole of the isolation coupler output terminal (PLC.DC) is connected to the differential mode inductor L3, and the other end of the differential mode inductor L3 is connected to the positive pole of the DC output terminal (POWER.DC) of the ordinary constant voltage power supply. The negative pole of the isolation coupler output terminal (PLC.DC) is connected to the differential mode inductor L4, and the other end of the differential mode inductor L4 is connected to the negative pole of the DC output terminal (POWER.DC) of the ordinary constant voltage power supply.

[0035] The signal isolation coupler in the present application includes 4 differential mode inductors (L1, L2, L3 and L4), 2 safety capacitors (C1 and C2), 1 PLC signal coupling coil (T1) and 4 two-core power lines (PLC.220VAC port, POWER.220VAC port, POWER.DC port and PLC.DC port).

[0036] The two-core power lines La and Na of the PLC.220VAC port of the PLC isolation coupler are connected to the live wire and neutral wire of the indoor PLC power grid respectively. The AC 220VAC of the PLC.220VAC port is injected into the live wire Lb and neutral wire Nb of the two-core power line of the POWER.220VAC port through the differential mode inductors L1 and L2 respectively connected in series on the live wire La and the neutral wire Na. The live wire Lb and the neutral wire Nb are then connected to the AC input terminals of the external ordinary constant voltage power supply respectively. The differential mode inductors L1 and L2 and the safety capacitor CX connected in parallel on the live wire and the neutral wire of the AC input port of the ordinary constant voltage power supply form a PLC signal isolation filter, so that the PLC number of the PLC.220VAC port will not be absorbed by the safety capacitor CX. The PLC number of the PLC.220VAC port is transmitted from the two-core power line La through the safety capacitor C1 connected in series on the live wire La and the P The LC signal coupling coil T1 is connected to the main side coil end 5 of the high frequency pulse transformer (1:1), the main side coil end 8 of the coupling coil T1 is connected to the neutral line Na to form a PLC signal main side loop, the PLC signal is connected to the safety capacitor C2 through the secondary side coil (end 4-end 3) of the coupling coil T1 to couple between V+ and V- of the PLC.DC port, the PLC signal between V+ and V- of the PLC.DC port is injected into the DC input port of the external lamp dimming module, the DC output port of the ordinary constant voltage power supply is connected to the V+ and V- of the POWER.DC port of the PLC signal isolation coupler through a two-core power line, the V+ and V- of the POWER.DC port are connected to the V+ and V- of the PLC.DC port of the PLC signal isolation coupler through differential mode inductors L3 and L4 respectively, and the DC power supply voltage is provided to the DC input port of the external lamp dimming module.

[0037] The problem of the safety capacitor CX connected in parallel to the neutral and live wires at the AC input end of the switching power supply of ordinary lighting appliances absorbing and interfering with the PLC communication frequency band signal is eliminated. At the same time, the problem of coupling the PLC signal at the AC input end of the switching power supply to the DC output end and injecting the PLC signal into the DC input port of the PLC dimming control module of the lamp is solved, thereby realizing intelligent control of the lighting of the lamp.

[0038] By connecting the PLC signal isolation coupler with the ordinary constant voltage power supply and the PLC dimming module (DC to DC) of the lamp, the transmission of the PLC signal from the AC input end to the DC output end can be realized, thereby realizing the ability to use an ordinary constant voltage power supply to control the lighting of a single or multiple lamps' dimming modules (DC to DC). At the same time, compared with using a separate driving power supply for each lamp, the total equipment cost is saved, because the ordinary constant voltage power supply can make the power consumption relatively high and can drive the dimming modules of several lamps at the same time.

[0039] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0040] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to the above embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the above embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0041] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A PLC signal isolation coupler, comprising: Differential mode inductor, safety capacitor and PLC signal coupling coil; characterized in that, The input end of the isolation coupler is an AC input end, which is connected to the PLC power grid. The input end of the isolation coupler is respectively connected to the live wire La and the neutral wire Na. A safety capacitor C1 is connected in series between the live wire La and the pin 5 of the coupling coil T1. Another safety capacitor C2 is connected in series between the output pin 4 of the coupling coil T1 and the positive pole of the DC output end. The DC output end is connected to the input ends of N lamp PLC dimming modules, and the other end of each lamp PLC dimming module is connected to an LED lamp. The live wire Lb and the neutral wire Nb of the input end of the common constant voltage switching power supply are respectively connected in series to the live wire La and the neutral wire Na of the AC input end of the isolation coupler through differential mode inductors L1 and L2; the positive electrode and the negative electrode of the output end of the common constant voltage switching power supply are respectively connected in series to the positive electrode and the negative electrode of the output end of the isolation coupler through differential mode inductors L3 and L4; By connecting the PLC signal isolation coupler with the ordinary constant voltage power supply and the PLC dimming module of the lamp, the transmission of the PLC signal from the AC input end to the DC output end is realized, and at the same time, the safety capacitor at the input end of the ordinary constant voltage power supply eliminates the interference of the PLC signal absorption in the PLC power grid.

2. A PLC signal isolation coupler according to claim 1, characterized in that: The N lamp PLC dimming modules are respectively recorded as lamp PLC dimming module 1, lamp PLC dimming module 2, ... lamp PLC dimming module N, and the N lamp PLC dimming modules are connected in parallel.

3. A PLC signal isolation coupler according to claim 1, characterized in that: The input end of the isolation coupler is the PLC power grid alternating current.

4. A PLC signal isolation coupler according to claim 1, characterized in that: The live wire La is connected to a differential mode inductor L1, the other end of which is connected to a live wire terminal Lb of a common constant voltage power supply; the neutral wire Na is connected to a differential mode inductor L2, the other end of which is connected to a neutral wire terminal Nb of a common constant voltage power supply.

5. A PLC signal isolation coupler according to claim 4, characterized in that: The live wire Lb and the neutral wire Nb are respectively connected to the live wire and neutral wire connection terminals of the AC input end of a common constant voltage power supply.

6. A PLC signal isolation coupler according to claim 4, characterized in that: The positive electrode and the negative electrode of the output end of the isolation coupler are respectively connected to the positive electrode and the negative electrode of the input end of the dimming module.

7. A PLC signal isolation coupler according to claim 6, characterized in that: The positive pole of the output end of the isolation coupler is connected to the differential mode inductor L3, and the other end of the differential mode inductor L3 is connected to the positive pole of the DC output end of the ordinary constant voltage power supply. The negative pole of the output end of the isolation coupler is connected to the differential mode inductor L4, and the other end of the differential mode inductor L4 is connected to the negative pole of the DC output end of the ordinary constant voltage power supply.

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