KR101277650B1 - Dimming control apparatus and method using amplitude change of common power source in power line communication - Google Patents

Abstract

PURPOSE: A dimming control device using the amplitude change of common power in PLC (Power Line Communication) and a method thereof are provided to eliminate the limitation of transmission power without constructing a special communication line for transmitting a control signal. CONSTITUTION: A voltage change device of a transmission end changes voltages in a predetermined period based on a zero crossing point of an input power waveform. The voltage change device transmits changed voltages including transmission data. The voltage change device measures RMS (Root Mean Square) voltages with the zero crossing point. The voltage change device receives the transmission data from the changed voltages. [Reference numerals] (AA) Power waveform; (BB) Power line transmission waveform; (CC) 10V change is one example; (DD) Voltage change device(10V); (EE) Transmission data

Description

Dimming control apparatus and method using amplitude change of common power source in power line communication}

The present invention relates to an apparatus and method for power line communication. In particular, in order to overcome a poor channel environment of power line communication, data to be transmitted from a transmitting end is transmitted by changing a voltage (amplitude) of commercial power supplied through a power line, and receiving the same. The present invention relates to a dimming control apparatus and method using an amplitude change of a commercial power source in power line communication for receiving data by sensing a voltage of a power source supplied through a power line.

Power Line Communication (PLC) is a method of separating and transmitting 100kHz ~ 30MHz communication signals using a high frequency filter using a power line as a communication line, and multiplexing power and communication signals by frequency multiplexing. Generally, a high frequency signal of several tens of kHz to several MHz is used as a power supply and communication signal of 60 Hz. The principle at the transmitting and receiving end of power line communication is briefly shown in FIGS. 1A and 1B.

Power line communication can be applied to various fields such as lighting and home network. Among the examples of street lamp bidirectional control system, the master modem located in the street lamp distribution box transmits the dimming command through the power line, The slave modem receives the command and controls the dimming ballast accordingly to control the brightness of the lamp.

As such, the street lamp bidirectional control system using power line communication installs the power line communication system in the existing individual street lamps and distribution boxes without separate line construction, and installs the central control system before the occurrence of the situation by patrol of the official in charge of management or report of the complaint. Through real-time, the status of individual streetlights can be identified at a glance, the power is immediately cut off when an individual short-circuit, ballast, or lamp malfunctions, and information on the occurrence of the situation is sent to the mobile phone or the central control station of a management person.

As described above, power line communication does not require a separate communication line, it is easy to install, there is an advantage that does not require a separate communication fee.

However, power line communication has a limitation in communication distance due to limited transmission power, noise generated asynchronously like electric motors, high frequency noise generated at an integer frequency of 60Hz, and when a switch of an electronic device is connected or disconnected. High load interference and noise occurs, such as independent impulse noise, and there is a disadvantage that the uncertainty of the signal attenuation due to the impedance change according to the environment.

Looking at the reason why the disadvantages of the above-described power line communication occurs in detail, as follows. First, since power lines were originally manufactured for the purpose of transmitting electric energy, they are designed to be suitable for low frequency electric signals of 60 Hz. That is, there is no interest in the transmission characteristics of the high frequency signal, and thus, the covering of the power line and the arbitrarily installed branch circuit and various load devices that are designed to satisfy only the insulation requirements act as a factor influencing the power line channel characteristics.

Therefore, due to this characteristic of the power line, the communication signal, which is a relatively high frequency signal, suffers a large attenuation as the frequency is increased, and must bear the signal loss and distortion caused by the branch, and the background noise caused by the heat generated during the electrical energy transfer process. In addition, since there are various interference signals from the outside which cannot be prevented by the insulation coating, a method for overcoming the disadvantages of power line communication is urgently needed.

In order to solve the above problem, the first object of the present invention is to eliminate the limitation of the transmission power without the need for a separate communication line for transmitting the control signal, easy installation, and no communication fee. Since there is no limit, the present invention provides a dimming control apparatus and method using an amplitude change of a commercial power source in power line communication in which power line communication is possible in all ranges in which 220 V / 60 Hz is transmitted.

In addition, the second object of the present invention is not only the effect of load interference and noise, the uncertainty of the signal attenuation disappears, and does not require a frequency modulation technique using a frequency modulation device, it is commercially available in power line communication that does not require a separate coupler device The present invention provides a dimming control apparatus and method using a change in amplitude of a power supply.

In addition, the third object of the present invention is to install a lamp power supply device (position in individual street lamp column) including a voltage change device (position in street lamp distribution box) and a voltage sensing device in the existing street lamp distribution box and individual street lamp column, without a separate line construction , Dimming control device using the amplitude change of commercial power in power line communication, which can be applied to street light lamp dimming control method that can save energy through this. To provide a method.

In addition, the fourth object of the present invention, unlike the dimming system through the change in voltage, the dimming step that can be controlled through data communication, when the number of bits of the transmission and reception data is n, not only the control of 2n steps but also the number of bits To provide a dimming control device and method using the amplitude change of the commercial power source in power line communication that can be controlled in more steps without limiting the increase.

The present invention for achieving the above object is a dimming control device using the amplitude change of the commercial power source in the power line communication, using a voltage change device of the transmitting end a predetermined period starting from the zero crossing point of the input power waveform Change the power supply voltage including the transmission data by changing the voltage as the unit time, and detect the changed power supply voltage supplied through the power line in the voltage sensing device at the receiving end, and set the zero voltage point as a starting point. Root Mean Square (RMS) voltage is measured, and the transmission data is received from the changed power supply voltage.

In addition, in the power line communication according to the present invention, the dimming control device using the amplitude change of the commercial power source is not constant, the voltage change device is the predetermined voltage during the unit time if the transmission data is High (1) If the transmission data is Low (0) without changing by the voltage, it is characterized by changing by the predetermined voltage during the unit time. That is, the change amount is measured during the unit time. Therefore, the slowly changing amount is ignored.

In addition, the voltage sensing device of the dimming control device using the amplitude change of the commercial power source in the power line communication according to the present invention, initially measuring the effective value voltage of the power supply voltage received through the power line, regardless of the measured voltage Is promised as High (1), and then the RMS value is measured at each promised unit time, and if the voltage falls below the threshold voltage from the initial measured voltage, the first data is determined to be 0 and the reception of data is started. If the measured voltage is compared with the previous voltage and the change is less than the threshold voltage, the received data is determined to be the same as the previous data. If the change is the rising change above the threshold voltage, the received data is determined as High (1). If the change is a change in the threshold voltage or more, the received data is determined to be Low (0).

In addition, the voltage sensing device of the dimming control device using the amplitude change of the commercial power source in the power line communication according to the present invention, by changing the duty (DUTY) of the PWM signal to the data received from the transmitting end to adjust the lamp brightness (Dimming) and Characterized in that it is used as a control signal for adjusting the motor speed.

In addition, the voltage change device of the dimming control device using the amplitude change of the commercial power source in the power line communication according to the present invention is provided in the street lamp distribution box, the voltage sensing device is provided in the lamp power supply device in the individual street lamp column, the voltage change device Is a two-stage tap single winding transformer in which a lower end of the first winding and an upper end of the second winding are connected by a dimming switch to supply power to a load, and one end of the first power supply is connected to the input power supplied to the upper end of the first winding. A bypass switch connected at a second end to a power line connecting the lower end of the first winding to the load, a first switch connected at one end to a first tap of the second winding, and connected to a common line at the other end; A second switch having one end connected to the first tap of the second winding and the other end connected to the first resistor connected to the common line, and one end connected to the second tap of the second winding and the other end Characterized in that one end is connected to a third switch connected to the common line, the second tap of the second winding and the other end including a fourth switch connected to a second resistor connected to the common line.

In addition, the present invention for achieving the above object is a dimming control method using the amplitude change of the commercial power source in power line communication, using a zero voltage (Zero Crossing) point of the input power waveform using the voltage change device of the transmitting end as a starting point Transmit the changed power supply voltage including the transmission data by changing the voltage of the predetermined period as the unit time by a predetermined voltage, and detect the changed power supply voltage supplied through the power line at the receiving end, and the effective value (RMS) from the zero voltage point as a starting point. Root Mean Square voltage is measured to receive the transmission data from the changed power supply voltage.

Further, in the power line communication according to the present invention, in the dimming control method using the amplitude change of the commercial power source, if the voltage of the input power waveform is not constant, the voltage changing device does not change the predetermined voltage if the transmission data is High (1). If the transmission data is Low (0), it is characterized by changing by the predetermined voltage.

Further, in the dimming control method using the amplitude change of the commercial power source in the power line communication according to the present invention, the voltage sensing device initially measures the effective value voltage of the power supply voltage received through the power line, regardless of the measured voltage The waveform is promised as high (1), and then the rms voltage is measured at each promised unit time, and if the voltage falls below the threshold voltage from the initial measured voltage, the first data is determined to be 0 and the reception of data is started. Thereafter, when the measured voltage is compared with the previous voltage and the change is less than the threshold voltage, the received data is determined to be the same as the previous data, and when the change is the rising change above the threshold voltage, the received data is determined as High (1). If the change is a change in the threshold voltage or more, the received data is set to Low (0).

In addition, in the dimming control method using the amplitude change of the commercial power source in the power line communication according to the present invention, the voltage sensing device, the brightness of the lamp (Dimming) by changing the duty (DUTY) of the PWM signal for the data received from the transmitter And it characterized in that used as a control signal for adjusting the motor speed.

In addition, in the dimming control method using the amplitude change of the commercial power source in the power line communication according to the present invention, the zero point (Zero Crossing) of the input power waveform in the voltage change device of the transmitting end as a starting point, in the high data untransmitted state And change the LOW state time by a predetermined voltage so as to maintain n times the unit time corresponding to the value of the data to be transmitted, and transmit the changed power supply voltage including the transmission data, and at the receiving end, the changed power supply voltage supplied through the power line. The power supply voltage may be sensed, and a root mean square (RMS) voltage may be measured based on a zero voltage point to receive the transmission data from the changed power supply voltage.

In addition, in the dimming control method using the amplitude change of the commercial power source in the power line communication according to the present invention, the voltage change device is provided in the street lamp distribution box, the voltage sensing device is provided in the lamp power supply device in the individual street lamp column, the voltage The change device includes a two-stage tap single winding transformer in which a lower end of the first winding and an upper end of the second winding are connected by a dimming switch to supply power to a load, and one end is connected to the first tap of the second winding. A first switch having the other end connected to the common line, a second switch connected at one end to the first tap of the second winding, and connected to the first resistor connected at the other end to the common line, and connected to the second tap of the second winding. A third switch having one end connected to the other end and the fourth switch connected to the common line, and a fourth switch connected to the second tab of the second winding and connected at the other end to the second resistor connected to the common line. And turning on the second switch when the voltage change device switches from the first tap to the second tap to change the voltage while the dimming switch and the first switch are ON. First step; A second step of turning on the fourth switch; A third step of turning off the first switch; A fourth step of turning on the third switch; A fifth step of turning off the second switch; And a sixth step of turning off the fourth switch.

Further, in the dimming control method using the amplitude change of the commercial power source in the power line communication according to the present invention, the voltage change device, one end is connected to the input power supplied to the upper end of the first winding and the other end of the first winding And a bypass switch connected to a power line connecting a lower end and the load.

As described above, the present invention has the advantage that a separate communication line for transmitting a control signal is unnecessary, easy to install, and no communication fee is required.

In addition, the present invention does not have a limit of distance by eliminating the limit of the transmission power, so that if the 220V / 60Hz range is all possible power line communication, by measuring the RMS voltage of the power line, the noise is averaged and disappears during voltage sensing, the load Less influence of interference and noise, the impedance of the power line is designed for 60Hz to eliminate the uncertainty of the signal attenuation, and by using a voltage changer, there is no need for a frequency modulation technique using a frequency modulation device, a separate coupler (Coupler) The advantage is that no device is required.

Accordingly, the present invention is to install a voltage change device and a voltage sensing device in the existing individual street lamp pole and street lamp distribution box without a separate line construction in the street lamp lamp dimming control method to which the present invention is applied, and controls the brightness of the street lamp according to the environment and needs (Dimming), which saves energy.

In addition, the present invention can provide a street lamp lamp dimming control method that can be controlled in 2n steps when the number of bits of the transmission and reception data is n, the dimming step that can be controlled through data communication, unlike the dimming system through the voltage change There is an advantage that there is no limiting factor in increasing the number of bits, and this allows more step control.

In addition, in the data transmission / reception method of transmitting a LOW at n times the unit time so as to correspond to the data value to be transmitted, and maintaining the HIGH when the data is not transmitted, the switching change quantity of the transmitting end device is only lowered and raised twice. Since it can be made to operate the system stably, there is an advantage that the complexity of the sensing at the receiving end disappears.

In addition, the present invention has the advantage that the receiving end control unit can be operated stably without the battery, since the power required for the operation of the receiving end can be changed even during the voltage change process.

1A and 1B are diagrams illustrating principles at a transmitting end and a receiving end of a general power line communication;
2a and 2b is a view showing the basic principle of the transmitting and receiving end according to the power line communication device and method of the present invention,
3a and 3b is a view showing the application principle of the transmitting and receiving end according to the power line communication apparatus and method of the present invention in the actual power line use environment,
4 is a configuration diagram applying a power line communication device and method according to the present invention to street lamp dimming control,
5 is a circuit diagram of a voltage change device used in the power line communication device and method according to the present invention;
6A to 6C are circuit diagrams illustrating a state at the time of a voltage change of the voltage changer of FIG. 5;
7A to 7G are circuit diagrams illustrating a step of changing a voltage of the voltage changing device of FIG. 5;
8 is a view showing the configuration of a street lamp distribution board when the power line communication device and method according to the present invention are applied to a street lamp lamp dimming control scheme;
9 is a block diagram of a voltage sensing device of a receiver used in a power line communication device and method according to the present invention;
10A to 10C illustrate an example of a voltage converter of the voltage sensing device of FIG. 9;
11A and 11B are views illustrating a full-wave rectifying circuit and a sampling method of the voltage sensing device of FIG. 9, respectively.
12A and 12B are diagrams illustrating a method of extracting received data by calculating an effective value of a voltage of the voltage sensing device of FIG. 9;
FIG. 13 is a diagram illustrating an example of a PWM signal used as a control signal of a CPU of the voltage sensing device of FIG. 9; FIG.
14 is a view showing a command transmission frame format according to Table 1;
15A to 15C are diagrams showing pulse holding times according to types of bits;
16 is a view showing an example of a waveform of a command for requesting a change in step 1 from Table 1 according to the rules of FIGS. 15A to 15C;
17A to 17C are circuit diagrams according to respective transfer states of the voltage change device,
18A-18C illustrate a method of delivering a dimming command with a holding time of an output voltage.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a detailed description of preferred embodiments of the present invention will be given with reference to the accompanying drawings. It should be noted that the same configurations of the drawings denote the same reference numerals as possible whenever possible. Specific details are set forth in the following description, which is provided to provide a more thorough understanding of the present invention. In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In order to overcome the poor channel environment of power line communication, the following various techniques are required. First of all, the required technology requires a frequency modulation technique for loading data on a frequency line via a power line, a coupling technique for combining a modulated communication signal with a power line, and receiving only a desired communication signal at a receiving end. There are prefilter techniques for removing signals, and channel coding techniques for converting to coded coding schemes to reduce error rates.

To this end, the power line communication apparatus and method according to the present invention is to measure the voltage (amplitude) of the commercial power (for example, 220V / 60Hz or 50Hz, 100V / 60Hz or 50Hz, etc.) supplied via the power line to the data to be transmitted from the transmitter The present invention proposes a method of changing data and transmitting the data, and receiving the data by sensing the voltage of the power supplied through the power line. In particular, the power line communication device and method according to the present invention proposes a power line communication device and method that is supplied to the receiving end without interruption even when the voltage changes.

2A and 2B are diagrams showing the basic principle of a transmitting and receiving terminal according to the power line communication device and method according to the present invention. For example, a voltage (amplitude) using a voltage change device of 10 V is applied to a power waveform of 220 V / 60 Hz. Is transmitted to transmit the transmission data 10011010, and the receiving end receives the data 10011010 by sensing the voltage of the power supplied through the power line. As shown in Figs. 2A and 2B, a cycle of power line transmission or reception waveforms represents one data. On the other hand, a certain period promised between the transmitting and receiving sides may display one data. The voltage sensing device at the receiving end receives the received data by measuring a root mena square (RMS) voltage from a zero crossing point.

3A and 3B are diagrams illustrating an application principle of a transmitting / receiving terminal according to a power line communication device and method according to the present invention in an actual power line use environment, where power waveforms 220 V / 60 Hz are not always maintained in an actual power line environment. Depending on the environment, the voltage will continue to change in real time (a large change of 2 to 3 V over one cycle rather than a sharp change).

As shown in FIG. 3A, when the power line input voltage of 220V / 60Hz decreases by 2V with time and rises by 2V with time, as shown in FIG. 3A, for example, when the transmission data is 1, the voltage drop in the voltage change device is reduced. Does not occur and the voltage of 10V is dropped to transmit only when the transmission data is zero.

Accordingly, as shown in FIG. 3B, at the receiving end, the waveform initially received through the power line is promised to be high (1), and thereafter, the effective value voltage is measured at each promised unit time, and the threshold voltage (Vth, for example, 6V) is measured. If the voltage drops abnormally, the first data is set to 0 and data reception is started. Next, when the measured voltage of the received signal rises 8V, and shows a rising change larger than Vth, the second data is determined as 1. Similarly, after measuring the voltage of the received signal and comparing it with the previous voltage, if the result of Vth is less than Vth, the previous data is determined as the data of the received signal. If it shows a change, it is set to 0 regardless of previous data.

Next, an embodiment will be described in detail with reference to FIG. 4, which is a configuration diagram in which the power line communication device and method according to the present invention are applied to street lamp dimming control. For convenience of description, the central control station and the portable wireless terminal required for control are not shown.

As shown in FIG. 4, when a voltage change device is mounted in a street lamp distribution box and a dimming command is transmitted through a power line, the voltage sensing device located in the street lamp receives the transmitted dimming command and controls the dimming ballast accordingly. To control the brightness of the lamp. In this case, the dimming ballast and the voltage sensing device may be integrally formed.

The lamp lamp dimming control method using the power line communication device and method according to the present invention shown in FIG. 4 is a voltage change device and a voltage sensing device in existing street lamps and street lamp distribution boxes without a separate line construction, unlike a conventional dimming method. It is possible to install, to control (dimming) the brightness of the street lamp according to the environment and needs, thereby saving energy. Accordingly, in the lamp lamp dimming control method using the power line communication apparatus and method according to the present invention, the dimming step is limited to N steps in the conventional dimming system (for example, N step voltage change method through the multi-stage tap). On the other hand, in the present invention, it is possible to remove the limitation of the dimming step that can be controlled through data communication. That is, when the number of bits of the transmission / reception data is n, control of 2n steps is possible.

As described above, the power line communication apparatus and method according to the present invention has the advantage that a separate communication line for transmitting a control signal is unnecessary, easy to install, and no communication fee is required.

In addition, the power line communication apparatus and method according to the present invention overcomes the disadvantages of the existing power line communication, and does not have a limit of distance by eliminating the limitation of the transmission power, so that all power line communication can be performed if 220V / 60Hz is delivered. . However, there is a limit in that communication is impossible to the upper end of the voltage change device (Korean electric direction), and only one-way communication in the load direction is possible.

In addition, since the power line communication apparatus and method according to the present invention measures the RMS voltage of the power line and noise is averaged and disappears during voltage sensing, the influence of the load interference and noise is small, and the impedance of the power line to 60 Hz has been previously used. Very high compared to the power line communication frequency (more than hundreds of times), the uncertainty of signal attenuation disappears, and the use of a voltage changer eliminates the need for frequency modulation using a frequency modulation device and eliminates the need for a separate coupler. .

FIG. 5 is a circuit diagram of a voltage change device used in a power line communication device and method according to the present invention. As shown in FIG. Transmit voltage and low voltage.

Hereinafter, the state of the voltage change of the voltage change device of FIG. 5 will be described in detail with reference to FIGS. 6A to 6C. First, FIG. 6A is a circuit diagram of a voltage changer when the output is 200V, and 200V is output as an output voltage by adjusting the winding ratio of the primary winding and the secondary winding to 220: 200 with respect to the input voltage 220V / 60Hz. At this time, since the secondary voltage is obtained from the formula (primary voltage x secondary winding ratio / 1 primary winding ratio), an output voltage of 200 V is obtained by substituting the input voltage and the primary and secondary winding ratios.

Next, Fig. 6B is a circuit diagram of the voltage change device when the output is 210V, and outputs 210V as the output voltage by adjusting the winding ratio of the primary winding and the secondary winding to 440: 420 for the input voltage 220V / 60Hz. Similarly, since the secondary voltage is obtained from the formula (primary voltage x secondary winding ratio / 1 primary winding ratio), substituting the input voltage and the primary and secondary winding ratios yields an output voltage of 210V.

FIG. 6C illustrates a switching circuit diagram for bypassing an input voltage to an output and bypassing a voltage applied to a transformer in an emergency situation, wherein sw5 is off and sw6 is on. By operating, the input voltage of 220V / 60Hz is output as an output voltage as it is.

Next, a process of changing the voltage from 200V to 210V by the voltage changing device of FIG. 5 will be described in detail with reference to FIGS. 7A to 7G. Although the voltage change between 220V and 10V has been described as an example in the foregoing description of the data transmission method of the transmitter and the receiver, the operation is the same even if the voltage is configured to be 210V as a reference voltage and 200V to 10V. 210V is High and 200V is Low.

In particular, the voltage change process of FIGS. 7A to 7G described below is used to damp the arc characteristic of the current flowing through the switch to cancel the arc characteristic generated when the flow of current is cut off due to the off operation of the switch. By using a damping resistor and keeping at least one switch on through the shunt winding, the entire switch of the shunt winding can be prevented from being turned off. It solves the problem that the power supply is not cut off, and therefore, the high voltage lamp does not turn on again when there is a momentary voltage cut-off. In addition, there is an advantage that the receiving unit can be stably supplied with power and operate without a battery.

First, FIG. 7A illustrates a first stage of change, and operates sw1 on. FIG. 7B illustrates a second stage of change, and operates sw2 on while sw1 is on. Subsequently, FIG. 7C is a step 3 of changing, operating sw4 on while sw1 and 2 are on, and FIG. 7D is a step 4 of changing, operating sw1 off. Only sw2 and 4 are turned on. Thereafter, FIG. 7E is a fifth step of changing, operating sw3 on while sw2 and 4 are on, and FIG. 7F is a sixth changing step, and sw3 and 4 are on. Keep sw2 off. Finally, Figure 7g is a seven step change, to operate sw4 off (off) so that only sw3 is on (on).

Likewise, in the case of changing the voltage from 210V to 200V, the voltage change process of FIGS. 7A to 7G described above is reversed.

8 is a diagram illustrating a configuration of a street lamp distribution board when the power line communication device and method according to the present invention are applied to a street lamp ramp dimming control method. Referring to FIG. 8, the controller controls the switch of the voltage conversion device according to data to be transmitted to change the output voltage, performs communication with a server through a wireless modem (communication unit), and provides various power information and statuses to the server. The switch of the voltage conversion device is controlled in response to the report and the dimming change request data transmitted from the server.

In addition, the street lamp distribution panel of the street lamp lamp dimming control method using the power line communication device and method according to the present invention includes a function for measuring the input and output voltage, current, power factor, power, etc. And the like (KEYPAD) for setting change request.

9 is a block diagram of a voltage sensing device of a receiver used in a power line communication device and method according to the present invention, wherein the voltage conversion and A / D converter is a CPU from a received power source (210V or 200V) supplied through a power line at a transmitter. The sample is converted to a voltage lower than 5V that can be measured (using PT or CT), sampled, and transmitted to the CPU. Subsequently, the CPU calculates the voltage transferred from the voltage conversion and the A / D converter as RMS (effective value), converts the received data using the data determination method of the above-described receiver, interprets the command, and interprets the corresponding command. Output a control signal. SMPS converts the received AC voltage into DC voltage for CPU, voltage conversion and A / D converter operation.

10A to 10C illustrate an example of a voltage converter used to convert a received power source to a low voltage of 5V or less in the voltage sensing device of FIG. 9, and FIGS. 10A, 10B, and 10C are respectively a power converter PT; Power transformer, resistor divider, and current transformer (CT).

First, referring to FIG. 10A, the power converter converts the voltage into a voltage range that can be read by the voltage converter and the A / D converter in a manner in which the primary voltage is converted into the secondary voltage according to the ratio of the primary turns ratio and the secondary turns ratio. Lower it. Power converters have the advantage of electrically isolating the primary and secondary circuits.

Next, referring to FIG. 10B, the circuit has a simple advantage in changing the input voltage of 220V to a low voltage of 2.2V according to the resistance ratio.

Finally, referring to FIG. 10C, when the current converter has a ratio of 100: 1, when the primary current is 2.2 mA, the secondary current is 22 uA, so the voltage applied to R2 is 2.2 V (22 uA x 100 kohm). Current converters have the advantage of being smaller in size than power converters as well as the electrical isolation of the primary and secondary sides.

11A and 11B illustrate a full-wave rectification circuit and a sampling method for converting AC into a pulse current so that the voltage conversion and the A / D converter can perform sampling in the voltage sensing device of FIG. 9, respectively. The circuit may use a half-wave rectifier circuit, and the rectifier circuit may be omitted when using a differential A / D converter. Sampling transfers the digital values sampled in real time to the CPU by sampling n times in one cycle.

12A and 12B are diagrams illustrating a method in which a CPU calculates an RMS value of a voltage and extracts received data in the voltage sensing device of FIG. 9, and the CPU is configured in a voltage conversion and A / D converter as shown in FIG. 12A. The effective value is calculated using the received data, and the received data is detected as shown in FIG. 12B. In one example, the effective value of one cycle is calculated. However, the effective value of several cycles may be calculated and averaged. The effective value can be obtained by the following equation.

FIG. 13 is a diagram illustrating an example of a PWM signal used by a CPU as a control signal for adjusting a lamp brightness or a motor speed in the voltage sensing device of FIG. 9. The transmitter is configured to change the duty of the PWM signal. The received data may be received by the receiver and changed into a control signal suitable for the same.

Next, Table 1 below is an example of each step command data for transmitting a dimming command using the control data transmitted and received, 4 bits are required to transmit the 16 dimming commands, but to reinforce the communication error The total of 8 bits is shown by adding 4 bits of complement of each bit in 4 bits of dimming instruction.

14 is a diagram illustrating a command transmission frame format according to Table 1, and FIGS. 15A to 15C are diagrams showing pulse holding times according to types of bits. The start bits are changed to high after holding at least two times the basic time. In this case, the High bit maintains the basic time in both High and Low states. The Low bit maintains twice the basic time in the Low state after maintaining the basic time in the High state. The default time T is set in seconds.

16 shows an example of a waveform of a command for requesting a change in step 1 from Table 1 according to the rules of FIGS. 15A to 15C. Referring to FIG. 16, since the waveform of the command requesting the change in step 6 should transmit 0x69, L, H, H, L, H, L, L, and H are transmitted after the start signal. If the basic time (T) is set to 1 second, it takes 22 seconds with a total of 22T.

17A to 17C show circuits of the voltage change device according to each transfer state, respectively. FIG. 17A illustrates the switch open / closed state in an idle state, FIG. 17B illustrates the switch open / close state in a high bit transfer state, and FIG. 17C illustrates the switch open / close state in a low bit transfer state.

18A to 18C illustrate a method of transmitting a dimming command with a holding time of an output voltage. FIG. 18A illustrates a method of transmitting a dimming command to a holding time of a changed output voltage, and operates to change to High after maintaining Low for n times the basic time, and the basic time T is set in seconds. If n is 1, it is a bypass command. If n is 2, the dimming command is transmitted in the order of 2 steps.

FIG. 18B transmits a dimming command at the holding time of the changed output voltage. Unlike FIG. 18A, the dimming command is changed to low after holding for n times High of the basic time. Similarly, if n is 1, the bypass command is transmitted. If n is 2, the dimming command is transmitted in the order of 2 steps.

FIG. 18C illustrates a method of transferring a dimming command in a cycle of changing an output voltage, and changes Low and High during a set number of times by an n times period of a basic time T. As shown, the bypass command changes Low and High during the set number of times at a period of 1 times the base time T, and the one-step command changes Low and High during the set number of times at a period of 2 times the basic time T. The dimming command can be delivered in a manner.

As described above, the power line communication apparatus and method according to the present invention do not require a separate communication line for transmitting a control signal, is easy to install, and does not require a communication fee.

In addition, the power line communication apparatus and method according to the present invention does not have a limit of distance by eliminating the limit of the transmission power, so that power line communication is possible in all ranges in which 220 V / 60 Hz is transmitted, and voltage sensing is performed by measuring the RMS voltage of the power line. Noise is averaged and disappears to minimize the effects of load interference and noise, and the power line's impedance at 60 Hz is very high (over hundreds of times) compared to the conventional power line communication frequency, which eliminates uncertainty in signal attenuation, as well as changing voltage. By using the device, there is no need for a frequency modulation technique using a frequency modulation device and no separate coupler device.

Accordingly, the street lamp lamp dimming control method using the power line communication device and method according to the present invention, the voltage change device and the voltage sensing device is installed in the existing street lamp pole and street lamp distribution box without a separate line construction, the street lamp according to the environment and needs Can control (dimming) the brightness of the device, thereby saving energy.

In addition, the lamp lamp dimming control method using the power line communication apparatus and method according to the present invention, unlike the dimming system through a voltage change, when the number of bits of the transmission and reception data is n, the dimming step that can be controlled through data communication is 2n Step control is possible.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but is capable of various modifications within the scope of the invention. Therefore, the scope of the present invention should not be limited by the described embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

Claims (12)

A power line communication device,
Transmit the changed power supply voltage including the transmission data by changing the voltage of the input power waveform to the starting point using the voltage change device of the transmitting end as the starting point and changing the voltage of the predetermined period as the unit time by a predetermined voltage. Detecting the changed power supply voltage supplied through a power line in a voltage sensing device, measuring a root mean square (RMS) voltage from a zero voltage point, and receiving the transmission data from the changed power supply voltage;
The voltage change device is provided in the street lamp distribution box, the voltage sensing device is provided in the lamp power supply device in the individual street lamp column,
The voltage change device includes a two-stage tap single winding transformer in which a lower end of the first winding and an upper end of the second winding are connected by a dimming switch to change a voltage while supplying power to a load, and an input power supply supplied to an upper end of the first winding. And a bypass switch connected at one end to the power line connecting the lower end of the first winding to the load, and a first end connected to the first tap of the second winding and the other end connected to the common line. A second switch connected at one end to a switch, a first tap of the second winding, and a second switch connected to a first resistor connected at the other end to the common line, and one end connected to a second tap of the second winding, and the other end of which is common And a fourth switch connected to a line and a fourth switch connected at one end to a second tap of the second winding and connected to a second resistor connected at the other end to the common line. Amplitude Dimming control apparatus using a.
The method of claim 1,
If the voltage of the input power waveform is not constant,
In the power line communication, when the transmission data is High (1), the voltage changing device does not change by the predetermined voltage during the unit time, and when the transmission data is Low (0), the voltage changing device changes by the predetermined voltage during the unit time. Dimming control device using amplitude change of commercial power.
The method of claim 2, wherein the voltage sensing device,
Initially, the effective voltage of the power supply voltage received through the power line is measured, and the waveform is promised high (1) irrespective of the measured voltage, and then the effective measured voltage is measured at each promised unit time. If the voltage is lower than the threshold voltage, the first data is determined to be 0 and data reception is started.
Thereafter, when the measured voltage is compared with the previous voltage and the change is less than the threshold voltage, the received data is determined to be the same as the previous data, and when the change is the rising change above the threshold voltage, the received data is determined as High (1). Dimming control device using the amplitude change of the commercial power supply in the power line communication, characterized in that if the change is a change of falling above the threshold voltage, the received data is determined as Low (0).
The method of claim 3, wherein the voltage sensing device,
Dimming control using amplitude change of commercial power in power line communication, characterized in that the data received from the transmitter is used as a control signal for controlling the brightness of the lamp (Dimming) and motor speed by changing the duty of the PWM signal (DUTY) Device.
delete delete delete delete delete In the power line communication method,
In the voltage changing device of the transmitter, the zero crossing point of the input power waveform is used as the starting point, and remains high in the non-data transmission state, and the LOW state time is n times the unit time corresponding to the data value to be transmitted. It transmits the changed power supply voltage including the transmission data by changing by a predetermined voltage to maintain, and detects the changed power supply voltage supplied through the power line at the receiving end, and the root mean square (RMS) voltage is set from the zero voltage point as a starting point. Measuring and receiving the transmission data from the changed power supply voltage;
The voltage change device is provided in the street lamp distribution box, the voltage sensing device is provided in the lamp power supply device in the individual street lamp column,
The voltage change device includes a two-stage tap single winding transformer in which a lower end of the first winding and an upper end of the second winding are connected by a dimming switch to change a voltage while supplying power to a load, and one end of the first tap of the second winding A first switch connected to the other end and connected to a common line, a second switch connected at one end to a first tap of the second winding, and connected to a first resistor connected at the other end to the common line, and a second of the second winding And a third switch having one end connected to the tab and the other end connected to the common line, and a fourth switch connected to the second tab of the second winding connected to the second tab and the other end connected to the second resistor connected to the common line. ,
The second switch to turn on the second switch when the voltage changing device switches from the first tap to the second tap to change the voltage while the dimming switch and the first switch are ON. Stage 1;
A second step of turning on the fourth switch;
A third step of turning off the first switch;
A fourth step of turning on the third switch;
A fifth step of turning off the second switch; And
And dividing the tap by performing a sixth step of turning off the fourth switch.
delete The method of claim 10, wherein the voltage change device,
Commercial power line communication, characterized in that it further comprises a bypass switch connected to the input power supplied to the upper end of the first winding and the other end is connected to a power line connecting the lower end of the first winding and the load. Dimming control method using amplitude change of power supply.

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