KR20170133862A - Power line communication system - Google Patents

Abstract

The present invention relates to a power line communication system for performing data transmission and reception through a power line for power supply, and modulating and demodulating a communication signal in an asynchronous manner. The power line communication system comprises: a transmission system generating a current change corresponding to data on a power line; and a receiving system detecting a voltage change corresponding to the current change of the power line to demodulate the data. Therefore, unidirectional and bidirectional communication can be implemented.

Description

POWER LINE COMMUNICATION SYSTEM [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power line communication system, and more particularly, to a power line communication system that performs data transmission and reception through a power line for power supply and modulates and demodulates data in an asynchronous manner.

Powerline communication is a communication technology that uses power lines and is applied in various fields.

Systems for implementing powerline communications should be able to implement unidirectional or bi-directional communications and provide modulation and demodulation schemes to improve communication speed and communication reliability.

A system for implementing power line communication can be implemented asynchronously. In this case, the protocol should be defined so that asynchronously transmitted data can be stably recognized by the receiving side.

 In addition, the protocol should be prepared so that the system for power line communication can reliably transmit data without being affected by the load.

Registration No. 10-1386877 (registered date: Apr. 14, 2014, name: power line communication system using AC disconnection line)

An object of the present invention is to provide a power line communication system which transmits data by modulating a current of a power line, detects a voltage change corresponding to a current change, and demodulates the data to realize unidirectional or bidirectional communication.

Another object of the present invention is to provide a power line communication system capable of stably demodulating data by accurately sampling a voltage change due to data transmission in units of clocks.

It is another object of the present invention to provide a power line communication system in which data is transmitted on a packet-by-packet basis, and a pre-sync code is formed in a packet in order to transmit information for receiving a packet and recognizing a clock.

Another object of the present invention is to provide a power line communication system capable of stable data demodulation by inserting a correction synchronization code into data received on a packet basis and correcting the clock using a correction synchronization code in the demodulation process.

It is another object of the present invention to provide a power line communication system capable of buffering the voltage ripple of a power line accompanied with data transmission from being transmitted to a load.

It is another object of the present invention to provide a power line communication system capable of stably receiving and demodulating data by controlling a load state in a specific mode when transmitting data.

According to an aspect of the present invention, there is provided a power line communication system including: a transmission system for generating a current change corresponding to data on a power line; And a receiving system that detects a voltage change corresponding to the current change of the power line and demodulates the data.

According to another aspect of the present invention, there is provided a power line communication system including: a power supply system for supplying power through a power line; And a power load system that receives the power through the power line. Here, the power supply system may include: a power supply unit that supplies the power through the power line; A current sensing load configured on said power line; A first current modulator for generating a current change corresponding to the first data on the power line; And a second voltage demodulation unit for detecting a voltage change corresponding to the current change of the power line corresponding to the second data and restoring the second data. The power load system may further include: a load that receives the power through the power line; A ripple buffer circuit that buffers the voltage change from being transferred to the load; A second current modulator for generating the current change corresponding to the second data on the power line; And a first voltage demodulator for sensing the voltage change corresponding to the current change of the power line corresponding to the first data and recovering the first data.

The power line communication system of the present invention is a power line communication system that supplies power through a power line, generates a current change corresponding to data on the power line, and selectively provides a pulse for setting a mode of the load to the power line. ; And a load to which power is supplied through the power line, wherein the data is detected by detecting a voltage change corresponding to the current change of the power line, and when the pulse is provided, And a power load system for controlling the load to perform an operation according to the pulse width, wherein the pulse has a lower frequency than the data.

The present invention can implement unidirectional and bi-directional communication by demodulating for data reception, which extracts modulation and voltage changes, for data transmission, which generates a current change.

In addition, the present invention accurately detects edge of data through AC coupling, high-pass filtering and amplification, and stably samples the data, thereby accurately sampling the voltage change generated for data transmission in units of clocks and stably demodulating the data .

In addition, the present invention can stably demodulate data transmitted asynchronously by constructing a pre-sync code in a packet for transmitting data and recognizing reception of a packet and recognition of a clock using a pre-sync code.

Further, in the present invention, by inserting and transmitting a correction synchronization code into the data, the clock can be corrected using the correction synchronization code in the process of demodulating the data, and as a result, the data can be stably demodulated.

Further, the present invention can prevent the voltage ripple from being transmitted to the load by buffering the voltage ripple generated in accordance with the data transmission, and can stably operate the load.

In addition, the present invention can prevent the noise caused by the operation of the load from affecting the data by controlling the state of the load in the specific mode when transmitting the data, so that the data can be stably transmitted and received.

1 is a block diagram showing an embodiment of a power line communication system of the present invention;
2 is a circuit diagram illustrating a current modulation unit of FIG. 1;
3 is a block diagram illustrating a voltage demodulator of FIG.
4 is a waveform diagram for explaining a process of demodulating transmitted data;
5 is a waveform diagram illustrating a packet including a permutation sync code;
6 is a block diagram exemplifying a voltage demodulating unit for performing demodulation by a permutation sync code;
7 is a waveform diagram for explaining a correction synchronization code inserted into data;
8 is a waveform diagram explaining a voltage change before and after the application of the embodiment of the present invention for controlling the mode of the load.
9 is a waveform diagram illustrating a method of controlling a mode of a load according to a first method of the present invention.
10 is a waveform diagram illustrating a method of controlling a mode of a load according to a second method of the present invention.
Figure 11 is a block diagram illustrating another embodiment of the present invention for implementing the method of Figures 8-9 for controlling the mode of the load.
12 is a block diagram showing still another embodiment of the power line communication system of the present invention.
13 is a block diagram showing still another embodiment of the power line communication system of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It is to be understood that the terminology used herein is for the purpose of description and should not be interpreted as limiting the scope of the present invention.

The embodiments described in the present specification and the configurations shown in the drawings are preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention and thus various equivalents and modifications Can be.

The power line communication system of the present invention performs transmission and reception of data by a modulation scheme for generating a current change and a demodulation scheme for sampling and extracting a voltage change corresponding to a current change.

The power line communication system can be classified into a power supply system that supplies power through a power line and a power load system that receives power through a power line. The present invention can be implemented to implement communication in a unidirectional direction from a power supply system to a power load system, unidirectional from a power load system to a power supply system, or bidirectional between a power supply system and a power load system. The side that transmits data in the above manner can be referred to as a transmission system, and the side that receives data can be referred to as a reception system.

The transmission system generates a current change corresponding to the data on the power line, and the receiving system detects the voltage change corresponding to the current change of the power line to demodulate the data.

1 illustrates a power communication system that transmits and receives data in a unidirectional direction from a power supply system 100 to a power load system 200. In this case, the power supply system 100 corresponds to a transmission system, (200) corresponds to the receiving system.

The power supply system 100 may include a power supply unit 10 for supplying power through a power line, a current sensing load 12 for sensing current, and a current modulator 14. The current modulating section 14 modulates the current flowing through the power line in accordance with the data to generate a current change.

A current control element is formed in the power line. The current control element ensures forward flow of current to the power line between the power load system 200 in the power supply system 100 and current flow in the reverse direction to the current modulator 14 through the power line in the power load system 200 . However, the current control device can be exemplified as the diode D1.

The power load system 200 includes a load 20 that is supplied with power through a power line, a ripple buffer circuit 22 that buffers a voltage change from being transferred to the load 20, and a voltage demodulator 24 . Here, the ripple buffer circuit 22 includes the LDO 23 and the capacitors C1 and C2, and the LDO (Low Drop Output) 23 is a voltage regulator that lowers the large voltage change of the power line. The voltage demodulator 24 detects the voltage change corresponding to the current change of the power line and demodulates the data.

First, the detailed configuration of the power supply system 100 and the modulation operation corresponding to the data Tx to be transmitted will be described.

The power line is connected between the power supply unit 10 and the load 20 and the power line is constituted by the current sensing load 12 and the LDO 23 of the ripple buffer circuit 22. [ The voltage modulator 24 is connected in parallel to the power line, and extracts a voltage change corresponding to the current change for demodulation. The voltage modulator 24 is connected to the power line in parallel, .

The current flowing from the power supply unit 10 to the current sensing load 12 can be defined as I1 and the current output from the current sensing load 12 can be defined as I2, The current flowing through the power line can be defined as I4, and the current flowing through the power line can be defined as I4.

First, the power supply unit 10 can be understood as a commercial AC power source. The power supply unit 10 supplies a power supply including the voltage and the current to the load 20 and the current I1 flows to the current sensing load 12 through the power line by the power supply of the power supply unit 10.

The current sensing load 12 may be composed of a load element for sensing a current change by the current modulating part 14 and may be composed of at least one of a resistance of several mΩ to several ohms, a Schottky diode and a zener diode .

The current modulating section 14 may be configured to include a switching element that receives the data Tx to be transferred and performs a switching operation corresponding to the data Tx, And to modulate the current I2 flowing through the power line. The data Tx is a combination of a plurality of bits and has a digital value, and has a value corresponding to a logical "1" or "0"

More specifically, the current modulating section 14 may be configured as shown in FIG. 2, and may include a resistor R1 and a switching device Q1. The switching element Q1 is turned on or off according to the logical value of the data Tx, and can be configured using the NOS transistor. That is, the switching element Q1 interrupts transfer of the current I3 transmitted through the resistor R1 to ground corresponding to each bit value of the data Tx applied to the gate.

When the switching element Q1 is turned off, the current I2 flowing from the current sensing load 12 to the power line is ensured to maintain a constant level continuously. Conversely, when the switching element Q1 is turned on, the current I2 to be supplied to the power line in the current sensing load 12 is transmitted to the ground via the switching element Q1. That is, the current flow of the power line is stopped. At this time, the flow of the reverse current directed to the switching element Q1 turned on through the power line in the power load system 200 may be cut off by the diode D1. Therefore, only the change of the current I2 to be supplied from the current sensing load 12 to the power line can be accurately controlled by the switching of the switching element Q1.

The current modulator 14 modulates the current I2 flowing through the power line in response to the data Tx as described above. It can be understood that the above-mentioned modulation means a current change of the power line due to the intermittence of the current I2 flowing into the power line corresponding to the data Tx.

The current change of the current I4 flowing through the power line due to the current interruption of the current modulating section 14 occurs.

The current change by the current modulation section 14 can be detected by the current sense load 12 and the voltage change corresponding to the current change generated by the current modulation section 14 is detected by the current sense load 12, .

On the other hand, the detailed configuration of the power load system 200 and the demodulation operation of the data Tx to be received will be described. The current supplied to the voltage demodulator 24 from the power line can be defined as I5 and the current supplied from the power line to the load 20 can be defined as I6 and the voltage applied to the voltage demodulator 24 is V5 . The voltage V5 includes a voltage change corresponding to the current change generated by the current modulation section 14. [ The voltage change of the voltage V5 can be expressed as shown in FIG.

The load 20 may be variously configured to receive power through a power line, operate using a power source, or consume power.

The load 20 is configured to be supplied with power through the ripple buffer circuit 22 configured on the power line.

The power line communication of the present invention uses a single line as a power line, and a power supply and a data transmission / reception are performed in parallel through a power line which is a single line. Therefore, in the present invention, when data is transmitted through a power line, a voltage change corresponding to a current change occurs. When the load is supplied with an exemplary voltage of 3 V through the power line, a voltage ripple of about 0.3 V level may occur in the power line due to the current change for data transmission (see FIG. 4).

More specifically, since the current modulation section 14 performs the current interruption between the rising edge and the falling edge of the data Tx, the voltage change of the power line is set so that the rising edge of the data Tx and the falling edge of the data Tx have a low level . That is, the voltage change of the power line exists as a ripple swinging between a level (illustratively, 3 V) to be supplied to the load 20 and a low level (for example, 2.7 V) between the rising edge and the falling edge of the data Tx .

The 0.3 V ripple due to the data transmission can be recognized as noise in the load 20 position. Therefore, the present invention stabilizes the voltage applied to the load 20 by the ripple buffer circuit 22.

To this end, the ripple buffer circuit 22 may include capacitors C1 and C2, respectively, which are provided at the input and output terminals of the LDO 23 and the LED 23, respectively. With the above configuration, the voltage V5 to be applied to the load 20 from the power line is first smoothed by the capacitor C1. The ripple component present at the smoothed voltage V5 by the capacitor C1 is adjusted by the LDO 23 so that the voltage difference is small. The voltage V5 whose ripple component voltage difference is adjusted by the LDO 23 is secondarily smoothed by the capacitor C2. The ripple present in the power line is buffered by the smoothing by the capacitors C1 and C2 and the adjustment by the LDO 23, so that the load 20 can be supplied with a voltage in which there is little ripple .

On the other hand, the voltage demodulator 24 detects a voltage change of the power line corresponding to the current change due to modulation for data transmission of the power supply system 100, and demodulates the data into Rx.

The voltage demodulator 24 may include an AC coupler 30, a high-pass filter amplifier 32, and a demodulator 34, as shown in FIG.

The configuration and operation of each component of the voltage demodulator 24 of FIG. 3 will be described below, and the operation of each component of the voltage demodulator 24 can be described with reference to FIG.

The AC coupler 30 is connected to a power line and outputs an edge extracting signal Vc corresponding to a voltage change of the voltage V5. The AC coupler 30 may include a capacitor for this purpose.

That is, the AC coupler 30 can output the edge extraction signal Vc corresponding to the rising edge and the falling edge by AC coupling in response to the voltage change of the voltage V5 by the data Tx.

AC coupling of the AC coupler 30 extracts only the voltage change at which the DC component is removed at the voltage V5. Then, the AC coupler 30 extracts the edge extraction signal of the negative region at the time point when the voltage V5 is lowered, that is, at the time corresponding to the rising edge of the data Tx, and at the time point when the voltage V5 becomes high, that is, at the polling edge of the data Tx The edge extraction signal of the positive region can be extracted at the corresponding time point. The shape of the edge extraction signal may be determined by the capacitance of the AC coupler 30. [

That is, the AC coupler 30 outputs an edge extraction signal Vc repeatedly present in the positive region and the negative region for each voltage change time of the voltage V5.

The high-pass filter amplifier 32 removes low-frequency components present in the edge extraction signal Vc and provides an output signal Vca obtained by amplifying the edge extraction signal Vc according to a predetermined gain. The low-frequency component removed by the high-pass filter amplifier 32 corresponds to noise, and the gain of the high-pass filter amplifier 32 for amplification can be designed so as to obtain a current suitable for sampling. At this time, it is preferable that the rising rate and the falling rate of the amplified edge extraction signals are adjusted so that the rising edge and the falling edge of the data Tx can be accurately demodulated.

The output signal Vca of the high-pass filter amplifier 32 is provided to a demodulator 34. The demodulator 34 samples the output signal Vco to perform demodulation and output demodulation result data Rx .

With the above-described configuration, an embodiment of the present invention can transfer data from the power supply system 100 to the power load system 200.

The data to be transmitted Tx may be provided from the data source (not shown) of the power supply system 100 to the power modulation section 14. [ Here, the data source of the power supply system 100 may include various devices for storing or generating information related to the load or data for control, and may include a controller, a control circuit, and the like, To the current modulation section 14 as data Tx.

The power supply system 100 generates a current change of the current I4 of the power line by modulation of the current modulation section 14 using the data Tx to be transmitted.

The current change of the current I4 is sensed by the current sensing load 12, thereby causing a voltage change of the power line.

The above-described voltage change is transmitted to the load 20 of the power load system 200 by the ripple buffer circuit 22 including the LDO 23.

The voltage demodulator 24 of the power load system 200 senses the voltage change of the power line.

The voltage demodulator 24 detects the edge of the data Tx by performing AC coupling, high-pass filtering, and amplification as described above, and performs sampling on edges to output demodulated data Rx.

As described above, the data Tx is transmitted using the current change of the power line, and the data Rx as a result of sensing the voltage change of the power line can be demodulated.

Embodiments of the present invention transmit data in an asynchronous manner. Therefore, information for recognizing the reception of the data Tx and information for recognizing the clock for demodulating the data Tx must be transmitted to the receiving side.

To this end, an embodiment of the present invention may define a packet to include a preamble code. A packet according to an embodiment of the present invention can be illustrated as shown in FIG.

The power supply system 100, which is a transmitting system, can be configured to transmit a packet including a preamble code and data using current variations. Here, the pre-sync code refers to a code configured to include a plurality of unit clocks defining a baud rate for recognizing data. The pre-sync code is configured at the start position of the packet so that the power load system 200, which is a receiving system, can recognize the reception of the packet. Each unit clock of the pre-sync code has the same frequency and duty, and the pre-sync code includes a unit clock of a predetermined number of bits such as 4 bits, 8 bits or 16 bits.

That is, the data can be divided and transmitted in units of packets, and each packet is composed of a pre-sync code and data. Therefore, the power supply system 100 sequentially transmits the pre-sync code and data when each packet is transmitted, and the power load system 200 can recognize the reception of the packet upon receiving the pre-sync code.

The power load system 200 may then perform an operation of demodulating the received data following the pre-sync code. At this time, the demodulation of the data can be performed based on the frequency of the unit clocks of the pre-sync code. To this end, the frequency of each clock of the pre-sync code may be configured to have the same frequency as the frequency of each bit included in the data.

Therefore, the power load system 200 can recognize a clock for data determination and generate a recognized clock using the unitary clocks of the pre-sync code repeatedly received for a predetermined period (for example, 8 periods) And demodulate the data by sampling the result of sensing the voltage change using the recognized clock.

The power load system 200 may be configured as shown in FIG. Referring to FIG. 6, the power load system 200 may include a packet transmission recognition unit 60, a clock recognition unit 62, and a demodulator 34. The power load system 200 of FIG. 6 can be understood as a packet transfer recognition unit 60 and a clock recognition unit 62 added to the demodulator 34 constructed in FIG. The embodiment of FIG. 6 is only illustrative to illustrate the operation of the power load system 200 corresponding to a packet including the pre-sync code of the present invention, and may be variously implemented by the manufacturer.

The packet recognition unit 60 is configured to provide a data demodulation enable signal corresponding to the recognition of the reception of the packet Rxo upon receiving the preceding synchronization code of the packet Rxo. The clock recognition unit 62 and the demodulator 34 can start the clock recognition operation and the demodulation operation by receiving the data demodulation enable signal. The clock recognition unit 62 starts the clock recognition operation by the data demodulation enable signal, receives the preceding synchronous code of the packet, recognizes the clock for judging the data by using the unit clocks of the preceding synchronous code, Lt; RTI ID = 0.0 > 34 < / RTI > The demodulator 34 starts demodulation by the data demodulation enable signal and performs sampling on the result of sensing the voltage change using the clock provided by the clock recognizer 62 to demodulate the data.

In the above operation, recognizing the clock using the unit clocks of the pre-sync code may include generating a clock for demodulation at the same frequency as the unit clocks, using the unit clocks as a reference clock. Here, the duty of the clock for demodulation can be set to have sufficient time for sampling.

As described above with reference to FIGS. 5 and 6, the embodiment of the present invention can recognize the reception of data transmitted asynchronously, that is, the reception of a packet, by constructing a pre-sync code for each packet, The clock for judging the data can be recognized. Therefore, since the embodiment of the present invention does not need to configure a separate device for synchronization between the power supply system 100 and the power load system 200, a system for power line communication can be economically and simply implemented.

On the other hand, the clock for demodulation can be recognized by the method of FIGS. 5 and 6 described above. However, the clock can be changed in the process of demodulating the data. Clock changes can occur due to electrical reasons such as noise or signal interference, external conditions such as ambient temperature, humidity, and physical reasons due to the characteristics of the components. If the clock is changed, errors in data demodulation may occur. Therefore, the clock needs to be calibrated from time to time in the process of demodulation.

To this end, the present invention can be configured to insert a correction sync code into the data in units of a predetermined number of bits as shown in FIG. 7, and to transmit the data in which the correction sync codes are inserted, on a packet-by-packet basis.

In other words, the power supply system 100 transmits the data in which the correction synchronization codes are inserted to the power load system 200 in units of packets, and the power load system 200 performs the data demodulation in units of a predetermined number of bits The clock for demodulation can be corrected using the regularly inserted correction synchronization code.

Here, the correction sync code is composed of at least 3 bits and can be configured to have a fixed value, and can be illustratively represented to include any of " 101 " and " 010 ". The present invention illustrates a 3-bit correction synchronization code. The correction synchronization code has a code value that can be separated from data by other bits having different values located one bit before and after the other. Therefore, the bits used in the demodulation and the bits included in the correction synchronization code can be effectively contrasted, and as a result, the correction of the clock can be accurately performed.

The present invention can constitute a packet by using the above-mentioned permutation synchronization code and correction synchronization code in combination. In this case, the packet includes a permutation synchronization code and data, the permutation synchronization code includes a plurality of unit clocks, and is configured at a start position of the packet, and a correction synchronization code is inserted into the data by a predetermined number of bits.

In this case, the power load system 200 receives the packet, recognizes the reception of the packet using the pre-sync code, recognizes the clock for determining the data, and uses the recognized clock to change the voltage It is possible to correct the clock for demodulating the data by referring to the correction synchronization code in the process of demodulating the data from the detection result and demodulating the data.

On the other hand, the load 20 operates using a power source. The operation of the load 20, such as consuming a lot of current for a long time, consuming a lot of current momentarily, or consuming a current with an irregularly large deviation, can be performed by modulating the data with the current change or demodulating the current change with the data It can act as noise in the data of the communication method of the invention. Noise due to the current consumption of the load 20 described above can serve as a barrier to stably transfer data from the power supply system 100 to the power load system 200. [

To this end, when data is transferred from the power supply system 100 to the power load system 200, the load performs at least one of an operation to interrupt power reception, an operation to limit power supply, and an operation to limit operation The load needs to be set so as to temporarily or temporally minimize the noise factor due to the use of the load current in the specific mode.

For example, when transmitting important data such as a control signal in a half-duplex state, the load needs to temporarily or temporarily control the consumed current to ensure stable transmission of data.

The present invention can be configured to selectively set a load in a specific mode at every time of transmitting all data, at a time of transmitting important data, or in a half-duplex state. To this end, the present invention provides a first method for changing the voltage level supplied to the power load system 200 in the power supply system 100 or a first method for changing the voltage level supplied to the power load system 200 in the power supply system 100 Can be implemented to inform the load 20 of the mode setting in a second way of providing a low frequency pulse.

8 is a waveform diagram showing a voltage noise due to the use of a load in a load before the load is controlled according to the present invention, and FIG. 8B is a waveform diagram showing a voltage noise Fig.

8, c) is a voltage waveform diagram for data communication before controlling the load according to the present invention, and d) is a voltage waveform diagram for data communication after controlling the load according to the present invention.

In a first method of changing the voltage level supplied to the power load system 200 in the power supply system 100 of the present invention described above, the voltage level change is described with reference to FIG. The voltage level change means that the voltage is lowered to the original voltage again as shown in FIG. 9A). At this time, the level (V2) for lowering the voltage should be set to be smaller than the voltage (V1) supplied to the load and smaller than the lowest voltage (V3) caused by the voltage drop (data) according to the current change for communication. The level change range of the voltage V2 should be applied so as not to affect the load 20 and the data.

The operation of dropping the voltage to V2 and returning the voltage to V2 as shown in Fig. 9 should be performed gently so that the fluctuation frequency of the voltage is sufficiently smaller than the frequency of the voltage variation due to the data. When the voltage V2 is lowered and returned as described above, the load can prevent the occurrence of voltage noise.

That is, the present invention can set a mode control period in which the voltage is returned after the voltage is lowered by the first method as shown in FIG. After the mode control period, the load 20 can stably control the voltage noise due to the load as shown in Fig. 8B).

Therefore, the present invention can stably transmit data as shown in Fig. 9B as the voltage noise is stabilized after the mode control period by the first method.

On the other hand, a second method of providing pulses of lower frequency than the data to the voltage supplied from the power supply system 100 to the power load system 200 can be described with reference to FIG.

A lower frequency than the data means a frequency band that can be sufficiently filtered by a high-pass filter applied for modulation and demodulation of the frequency of the data communication.

That is, in the second method, the pulse must be sufficiently larger than the voltage change frequency due to the current fluctuation of the load and the change duration should be long, and the data must be lower than the data so that it can be sufficiently filtered by the high- It is preferable to have a frequency.

The second method of the present invention can set a mode control period in which the pulse is provided as shown in FIG. After the mode control period, the load 20 can stably control the voltage noise as shown in Fig. 8B).

Therefore, according to the second method, as the voltage noise is stabilized after the mode control period, the present invention can stably transmit data as shown in FIG. 10B.

The embodiment of FIGS. 9 and 10 described above can be implemented by the embodiment of FIG. In the embodiment of FIG. 11, the power supply system 100 is configured to provide a voltage drop or a pulse on the power line to set the mode of the load 20 in the mode control period, The load 20 is configured to perform an operation according to a predetermined specific mode when the voltage drop or the pulse is provided in the power supply 100 and to stably control the power noise by the load 20. [

After the mode control period, the load 20 is switched to a predetermined specific mode for stably transmitting the data, so that the load 20 stably controls the voltage noise. At this time, the mode of the load 20 for stabilizing the voltage noise can be defined as " current silence mode ". The load 20 may perform at least one of an operation to interrupt the power supply reception in the current silence mode, an operation to limit the power supply, and an operation to limit the operation.

The embodiment of Fig. 11 for the above operation differs from that of Fig. 1 in that the mode control section 16 of the power supply system 100 and the mode recognition section 26 of the power load system 200 are further configured The other components are the same. Therefore, a duplicated description of the configuration and operation of the same elements as those in Fig. 1 in the embodiment of Fig. 11 is omitted.

11, the mode control unit 16 of the power supply system 100 has an operation for controlling the mode of the load 20 when it is necessary to stabilize the voltage noise of the load 20 in order to stably transmit data . For this purpose, the mode control unit 16 controls the power supply unit (not shown) to decrease the voltage of the power line during the mode control period for the first method and to return the voltage of the power line after a predetermined time or to provide a pulse to the voltage of the power line for the second method 10).

In response to the first method, the power supply unit 10 drops the voltage of the power line and returns after a predetermined time, or supplies a voltage including a pulse to the power line corresponding to the second method.

At this time, the mode control period starts from a time point preceding the transmission start time of the data Tx by a predetermined time, and stops immediately before the transmission start time of the data Tx. That is, it is preferable that the mode control section is maintained for a time period during which the mode recognizing section 26 of the power load system 200 can recognize the voltage drop or the pulse supply of the mode control section, and before the data Tx is transmitted, It is preferable to stop the transmission for stable transmission.

The mode recognition unit 26 of the power load system 200 recognizes the voltage conversion of the power line by the mode control unit 16 and provides the mode control signal to the load 20. [ More specifically, the mode recognition unit 26 recognizes the voltage drop or the pulse of the mode control period in which the voltage conversion of the power line occurs. The mode recognition unit 26 provides a mode control signal to the load 20 to control the load 20 to perform the current silencing mode.

The load 20 receives the mode control signal corresponding to the mode control period by the pulse detecting unit 26, and enters the current silencing mode before the power load system 200 receives the data Tx. Accordingly, the load 20 is connected to the power supply system 100 via the power supply system 100 so that the power consumption of the power supply system 100 is reduced, Mode.

Therefore, every time data is transmitted, every time data is transmitted, or half duplex, the load 20 performs the operation corresponding to the current silencing mode while data is being transmitted in the power supply system 100 Respectively. As a result, the voltage noise due to the operation of the load 20 can be prevented from acting on the transmitted data Tx, and the data can be prevented from being applied to the data Tx as shown in FIG. 8D, FIG. 9B or FIG. Can be stably transmitted from the power supply system 100 to the power load system 200

1, the present invention can be configured to transmit and receive data in the unidirectional direction from the power load system 200 to the power supply system 100. [ In this case, the power load system 100 corresponds to the transmission system and the power supply system 200 corresponds to the reception system.

An embodiment for this can be illustrated as shown in FIG. In the embodiment of FIG. 10, the power load system 200 includes a current modulating unit (not shown) for generating a current change by modulating a current flowing through a power line corresponding to a load 20 supplied with power through a power line and data to be transmitted Tx, (25). The power supply system 100 includes a power supply unit 10 for supplying power through a power line, a current sensing load 12 for a power line, and a voltage for demodulating data by detecting a voltage change corresponding to a current change of the power line. And a demodulation unit 15.

1, the current demodulator 25 performs the same configuration and operation as the current demodulator 14 of FIG. 1, and the voltage demodulator 15 has the same configuration and operation as the voltage demodulator 24 of FIG. . Therefore, redundant description of the configuration and operation thereof is omitted.

10, the power load system 200 generates a current change corresponding to the data Tx on the power line, and the power supply system 100 detects the voltage change corresponding to the current change of the power line, Lt; / RTI >

At this time, the current flowing from the load 20 to the current modulator 25 can be cut off by the diode D2 constituted by the current control element. Therefore, only the change of the current I5 can be accurately controlled by the switching of the switching element in the current modulation section 25. [

The technique of inserting the corrective synchronization code of FIGS. 5 to 7 into the packet and the technique of inserting the correction synchronization code into the data for transferring data in the asynchronous manner in the embodiment of FIG. 10 is also applied in the same manner as the embodiment of FIG. . Therefore, redundant description thereof will be omitted.

In the meantime, the present invention can be embodied to enable bi-directional communication by combining the embodiments of FIG. 1 and FIG. 10, and an embodiment thereof can be configured as shown in FIG.

In the embodiment of Figure 11, the power load system 200 acts as a receiving system when the power supply system 100 acts as a transmitting system. In this case, a current change by modulating the data Tx1 to be transmitted in the power supply system 100 is generated by switching the current I31, and the power load system 200 detects a power change corresponding to the current change and demodulates And outputs data Rx.

And, in the embodiment of Fig. 11, the power supply system 100 acts as a receiving system when the power load system 200 functions as a transmitting system. In this case, a current change in which the data Tx2 to be transmitted in the power load system 200 is modulated is generated by switching of the current I32, and the power supply system 100 detects the power change corresponding to the current change and demodulates And outputs the data Rx2.

The current modulation and the voltage demodulation of the data in each direction can be understood as the embodiment of Figs. 1 to 4, and thus a duplicate description thereof will be omitted.

The technique of embedding the pre-sync code of Figs. 5 to 7 in the packet and the technique of inserting the correction sync code into the data for transferring data in the asynchronous manner in Fig. 11 is applied in the same manner as the embodiment of Fig. . Therefore, redundant description thereof will be omitted.

The embodiment of FIG. 11 is also limited to the case of transmitting data from the power supply system 100 to the power load system 200, so that the technique described with reference to FIGS. 8 and 9 is applied in the same manner as the embodiment of FIG. can do. Therefore, redundant description thereof will be omitted.

Claims (23)

A power supply system that supplies power through a power line, generates a current change corresponding to data on the power line, and converts a voltage of the power line in a predetermined state to set a mode of the load; And
And a load that is supplied with power through the power line, wherein the control unit detects a voltage change corresponding to the current change of the power line to demodulate the data, and when the voltage of the power line is converted in the pre- And a power load system for controlling the load to perform an operation according to the mode,
Wherein the conversion of the voltage of the power line is set to be larger than a voltage supplied to the load and smaller than a minimum voltage due to a voltage drop of the voltage change according to the current change. The method according to claim 1,
The power supply system includes:
A power supply unit for supplying power through the power line;
A mode control unit for controlling a voltage output from the power supply unit for voltage conversion of the power line;
A current sensing load configured on said power line; And
And a current modulator for modulating the current flowing through the power line in accordance with the data to generate the current change
The power load system includes:
A mode recognition unit for recognizing the voltage conversion of the power line by the mode control unit and providing a mode control signal;
A load which is supplied with power through the power line and performs an operation according to a preset mode when the mode control signal corresponding to the voltage conversion of the power line is received;
A ripple buffer circuit that buffers the voltage change from being transferred to the load; And
And a voltage demodulator for detecting the voltage change corresponding to the current change of the power line and demodulating the data. 3. The method of claim 2,
Wherein the power line further comprises a current control element for blocking a current from flowing to the current modulator through the current line in the power load system. 3. The method of claim 2,
Wherein the current sensing load comprises at least one of a resistor, a Schottky diode and a Zener diode. 3. The method of claim 2,
Wherein the current modulator includes a switching element that performs a switching operation in response to the data and interrupts the current of the power line by the operation of the switching element to perform the modulation. 2. The system of claim 1,
An AC coupler connected to the power line and outputting an edge extraction signal corresponding to the voltage change;
A high-pass filter amplifier for performing high-pass filtering and amplification on the edge extraction signal of the AC coupler; And
And a demodulator for demodulating the data by sampling an output signal of the high-pass filter amplifying unit. The method according to claim 6,
Wherein the AC coupler includes a capacitor and outputs the edge extraction signal so as to have an edge extraction signal corresponding to the voltage change time point. The method according to claim 1,
Wherein the load performs at least one of stopping power supply reception in response to the mode, restricting the power supply, and restricting the drive. The method according to claim 1,
Wherein the power supply system drops the voltage of the power line to return the voltage of the power line in the pre-determined state and returns after a predetermined time, and the voltage conversion of the power line changes the voltage of the voltage line A power line communication system in which a frequency is greater than a frequency and a variation duration is set longer. The method according to claim 1,
Wherein the power supply system provides a voltage to the voltage of the power line to convert the voltage of the power line to the predetermined state. 11. The method of claim 10,
Wherein the pulse is set to have a frequency greater than the frequency of the voltage noise due to the current fluctuation of the load, a variation duration, and a frequency lower than the data. 11. The method of claim 10,
Wherein the pulse is provided for a predetermined time before a start of transmission of the data. The method according to claim 1,
Wherein the power supply system transmits a pre-sync code and a packet including the data using the current change, and the pre-sync code includes a plurality of unit clocks defining a baud rate for recognizing the data And wherein the pre-sync code is configured at a start position of the packet. 14. The method of claim 13,
Wherein each unit clock of the pre-sync code has the same frequency as each bit of the data. 15. The method of claim 14,
Wherein the receiving system receives the packet, recognizes reception of the packet using the pre-sync code, recognizes a clock for determining the data, and uses the recognized clock to change the voltage And demodulates the data. 15. The system of claim 14,
A packet recognition unit for receiving the preamble code of the packet and providing a data demodulation enable signal corresponding to the recognition of the reception of the packet;
A clock recognizing unit that recognizes a clock for determining the data using the unit clocks when receiving the pre-sync code of the packet and provides the recognized clock; And
And a demodulator for demodulating the data by sampling the result of sensing the voltage change by using the clock provided by the clock recognition unit to start demodulation by the data demodulation enable signal, Communication system. The method according to claim 1,
Wherein the power load system inserts a correction synchronization code into the data by a predetermined number of bits and transmits the data in which the correction synchronization codes are inserted in units of packets. 18. The method of claim 17,
Wherein the correction sync code comprises at least three bits and has a fixed value. 19. The method of claim 18,
Wherein the correction sync code comprises a logical state of any one of " 101 " and " 010 ". 18. The method of claim 17,
Wherein the power load system demodulates the data at a result of sensing the voltage change and a clock for demodulating the data is corrected with reference to the correction sync code. The method according to claim 1,
The power supply system is characterized in that the system transmits the data on a packet basis,
Wherein the packet includes a pre-sync code and the data,
Wherein the pre-sync code comprises a plurality of unit clocks defining a baud rate for recognizing the data and is configured at a start position of the packet,
And the correction synchronization code is inserted into the data in a predetermined number of bits. 22. The method of claim 21,
Wherein the correction sync code is composed of 3 bits having a fixed value, and each bit of each unit clock of the pre-sync code and the correction sync code have the same frequency. 22. The system of claim 21,
And receiving the packet, recognizing receipt of the packet using the pre-sync code, recognizing a clock for determining the data, and detecting a voltage change using the recognized clock, Demodulating the data,
And a clock for demodulating the data in the process of demodulating the data is corrected with reference to the correction synchronization code.

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