JP5758208B2 - Power line transmission device - Google Patents

Description

  The present invention relates to a power line transmission device, and more particularly to a technique suitable for use in power line communication between a parent device and a child device via a power line.

  2. Description of the Related Art Conventionally, power line carrier communication for performing communication between computers using a power line for supplying AC commercial power as a transmission medium is known. A communication device (so-called PLC modem or the like) for performing the power line carrier communication is directly connected to the power line. Therefore, a device has been proposed in which a communication unit that functions as a communication device is assembled to a power supply device (so-called AC adapter) that supplies a DC power supply to an external device based on an AC commercial power supply (see, for example, Patent Document 1). This device also functions as a communication device, and operates as a normal AC adapter when the communication unit is removed.

  By the way, regarding the AC adapter, a problem has been pointed out that it consumes power that cannot be ignored even during standby. For example, an AC adapter using a switching regulator always performs a switching operation while being connected to an AC commercial power source, causing a loss. For this reason, there is a concern about an increase in power consumption, and there is a problem that power consumption increases especially when a power line transmission circuit is incorporated in many devices.

  As a technique for suppressing the increase in power consumption in the standby state described above, a technique for suppressing power consumption in the standby state in a configuration in which a DC power supply is supplied based on an AC commercial power supply has been proposed (see Patent Document 2). ).

JP 2003-283389 A JP 2008-182626 A

In the case of the power supply unit proposed in Patent Document 2, the power loss in the AC-DC conversion circuit arranged to supply the DC operating power from the AC power supply becomes larger, There were problems such as complexity.
In view of the above-described problems, the present invention reduces power loss when supplying DC operating power when a power line transmission circuit is incorporated in an apparatus main body connected to an AC commercial power line with a simple configuration circuit. It is a first object to make it possible.
A second object is to make the reference potential of the circuit of the apparatus main body to be incorporated common with the reference potential of the circuit for power line transmission.
The third object is to prevent the high-frequency signal supplied from the master unit from being applied to the main body. Also, the load driven by the master unit by increasing the impedance to the high-frequency signal sent from the master unit of the slave unit. A fourth object is to increase the resistance.
It is a fifth object of the present invention to prevent noise generated from the apparatus main body from interfering with communication between the parent device and the child device.

A power line transmission device according to the present invention is a power line transmission device provided with a power supply circuit that is used by being added to an apparatus main body connected to a power line and that receives an alternating voltage from the power line and generates direct current power. A series circuit disposed between the input points of the first and second AC voltages of the power line, comprising a parallel resonance circuit including a tuning coil having a secondary coil and a tuning capacitor, and a bypass capacitor A communication circuit that receives and responds from the secondary coil of the tuning coil with a high-frequency signal transmitted superimposed on the AC voltage of the power line, and the AC voltage of the power line. A current limiting capacitor for converting to a direct current and outputting to the communication circuit; an anode connected to the current limiting capacitor; and a cathode connected to a power supply terminal of the communication circuit A second series circuit constituted by a rectifying diode, a parallel circuit constituted by a Zener diode and a smoothing capacitor connected between a power supply terminal of the communication circuit and a reference potential, and a cathode connected to the current And a second rectifying diode having an anode connected to a reference potential side of the communication circuit, and connected to a connection point of a limiting capacitor and an anode of the first rectifying diode, and the second series circuit and the A power supply circuit is configured by connecting a parallel circuit in series and connecting the second rectifying diode between the reference point and a connection point between the current limiting capacitor and the first rectifying diode, connect the power supply circuit to both ends of the bypass capacitor supplies a power source of the apparatus main body from both ends of the bypass capacitor, before The current applied between the power supply terminal and a reference potential of the communication circuit, characterized by being adapted to supply to limit at the current limiting capacitor.

Another feature of the present invention is that it is used in addition to an apparatus main body connected to a power line, and receives an AC voltage applied between input points of the first and second AC voltages of the power line. A power line transmission device having a power supply circuit for generating DC power and comprising a series circuit disposed between first and second AC voltage input points of the power line, and a tuning coil and a tuning coil A first series circuit composed of a parallel resonant circuit composed of a capacitor and a bypass capacitor, and the parallel resonant circuit connected to the first input terminal of the power line are transmitted superimposed on the AC voltage of the power line. A communication circuit that receives and responds to an incoming high-frequency signal; a parallel circuit that is connected between a power supply terminal of the communication circuit and a reference potential; and a Zener diode and a smoothing capacitor; A high frequency signal came transmitted by superimposing the alternating voltage on the line is rectified to obtain from the parallel resonant circuit, a bridge rectifier circuit for applying a direct current output obtained by the rectifier as a power source of the communication circuit, the first of the power line And a first rectifying diode having a cathode connected to a power supply terminal of the communication circuit and an anode connected to the other end of the current limiting capacitor. And a second diode having a cathode connected to the other end of the current limiting capacitor and an anode connected to a reference potential of the communication circuit, and supplying power to the apparatus body from both ends of the bypass capacitor The current applied between the power supply terminal of the communication circuit and a reference potential is limited and supplied by the current limiting capacitor. That.

  Another feature of the present invention is that it is used in addition to a device main body connected to a power line, and for power line transmission provided with a power supply circuit that receives an AC voltage from the power line and generates DC power. A device, which is a series circuit disposed between input points of the first and second AC voltages of the power line, and includes a parallel resonance circuit including a tuning coil including a secondary coil and a tuning capacitor, and a bypass A first series circuit constituted by a capacitor, an AC voltage applied from both ends of the bypass capacitor is full-wave rectified, and is superimposed on a power supply circuit to be applied to the device body and the AC voltage of the power line. A communication circuit that receives and responds to the high-frequency signal transmitted from the secondary coil of the tuning coil, and one end connected to the first terminal of the power line and the other end to the first A first current limiting capacitor connected to the anode of the diverting diode; a first rectifying diode having an anode connected to the first current limiting capacitor and a cathode connected to a power supply terminal of the communication circuit; One end of the second series circuit constituted by the power line and the second terminal of the power line via the parallel resonant circuit, and the other end connected to the anode of the second rectifying diode. And a second rectifier diode having an anode connected to the second current limiting capacitor and a cathode connected to the power supply terminal of the communication circuit. Are connected between a power supply terminal of the communication circuit to which the cathodes of the first and second rectifying diodes are connected in common and a reference potential of the communication circuit. Further, a cathode is connected to a connection point between the parallel circuit composed of a Zener diode and a smoothing capacitor, the first current limiting capacitor and the first rectifying diode, and an anode is connected to a reference potential of the communication circuit. A fourth rectifying diode having a cathode connected to a connection point between the third rectifying diode, the second current limiting capacitor, and the second rectifying diode, and an anode connected to a reference potential of the communication circuit; A reference potential of the communication circuit is connected to an output point on the reference potential side of the power supply circuit to be applied to the apparatus body, and a current applied between the power supply terminal of the communication circuit and a reference potential is provided. The first and second current limiting capacitors are used to limit the current to be supplied.

According to the present invention, the direct current is generated from the alternating current by the current limiting capacitor and the rectifying diode for converting the alternating current flowing through the power line into the direct current and outputting the direct current to the communication circuit with a simple configuration. Therefore, it is possible to reduce power loss when supplying DC operating power to devices used connected to AC commercial power lines with a simple configuration circuit, and supply DC power based on AC commercial power It is possible to reduce the amount of power consumed for the operation.
Further, according to another feature of the present invention, DC power can be generated from a high-frequency signal transmitted by being superimposed on an AC current flowing through the power line with a simple configuration.
According to another feature of the present invention, when the power line transmission circuit is incorporated in the device, the reference potential of the device circuit and the reference potential of the power line transmission circuit can be made common.
Further, according to another feature of the present invention, it is possible to prevent a high frequency signal supplied from the master unit from being applied to the apparatus main body.
In addition, according to another feature of the present invention, it is possible to increase the impedance of the high frequency signal sent from the master unit of the slave unit and increase the load resistance driven by the master unit to drive a large number of slave units simultaneously.
According to another feature of the present invention, it is possible to prevent noise generated from the apparatus main body from interfering with communication between the parent device and the child device.

It is a circuit block diagram which shows 1st Embodiment of the device for power line transmission of this invention. It is a circuit block diagram explaining 2nd Embodiment of the device for power line transmission. It is a circuit block diagram explaining 3rd Embodiment of the device for power line transmission. It is a circuit block diagram explaining 4th Embodiment of the device for power line transmission. It is a wave form diagram explaining operation | movement of the operating power line transmission device of 4th Embodiment. It is a circuit block diagram explaining the device for power line transmission of 5th Embodiment. It is a wave form diagram explaining operation | movement of the device for operation power line transmission of 5th Embodiment. It is a wave form diagram explaining operation | movement of the device for operation power line transmission of 5th Embodiment. It is a circuit block diagram explaining 6th Embodiment of the device for power line transmission. It is a circuit block diagram which shows the modification of the device for power line transmission of 1st Embodiment. It is a circuit block diagram which shows the modification of the device for power line transmission of 5th Embodiment. It is a circuit block diagram which shows the modification of the device for power line transmission of 3rd Embodiment. It is a block diagram explaining the 1st usage example. It is a block diagram explaining the 2nd usage example. It is a circuit block diagram explaining the background example of this invention.

(Background technology)
First, the background art of the present invention which does not use a transformer for converting the voltage of the input alternating current will be described with reference to FIG.
In the handset 150 shown in FIG. 15, when point A is positive with respect to point B, point A → D7 → current limiting resistor RT → zener diode D5, parallel circuit of the smoothing capacitor C2 and the communication circuit 104 → L1 and C1 Current flows through the parallel resonance circuit → B point. That is, when the point A is positive with respect to the point B, a current flows and is clamped by the Zener diode D5, and charged by the smoothing capacitor C2 to suppress ripples and applied to the communication circuit 104 as an operating power source. When the point A is negative with respect to the point B, no current flows because of the rectifying diode D7. In this state, operating power is supplied to the communication circuit 104 from the smoothing capacitor C2.

  In the example of FIG. 15, power is supplied to the communication circuit 104 via the current limiting resistor RT. For this reason, even if the operating power of the communication circuit 104 of the slave unit 150 may be 5 V and 2 mA, a large amount of current flowing through the Zener diode D5 is supplied to stabilize the voltage.

  When the AC power source is an alternating current of 100 V, most of the voltage is applied to the current limiting resistor RT, so that power consumption at the current limiting resistor RT increases. For example, when the current limiting resistor RT is 15 KΩ, the power consumption is about 300 mW. In this case, when 50 slave units are operated, there is a problem that a large power of 15 W is always consumed even during standby.

(First embodiment)
Next, a first embodiment of the present invention will be described with reference to FIG.
In the example of FIG. 1, signal exchange with a power line transmission device (hereinafter referred to as a slave unit 100) externally attached to the apparatus main body 101, and AC power can be applied via the plug 102.
First, an operation in the case where AC power is not applied to the communication circuit 104 via the plug 102 and only a high frequency signal from a parent device (not shown) is sent to the child device 100 will be described.

  The parallel resonance circuit 103 including the tuning coil L1 including the secondary coil L2 and the tuning capacitor C1 resonates with a high-frequency signal (for example, 400 KHz) transmitted from the parent device. Since the bypass capacitor C4 and the parallel resonant circuit 103 are connected in series, the high-frequency signal sent from the parent device via the power lines 102a and 102b is applied to the parallel resonant circuit 103 and connected in parallel to the bypass capacitor C4. It is not applied to the apparatus main body 101 side.

  The high frequency signal applied to the parallel resonant circuit 103 is rectified by the bridge rectifier circuits D1, D2, D3, and D4 from the secondary coil L2 of the tuning coil L1 via the surge protection resistors R1 and R2, and diodes D3 and D4. The DC output taken out between the common cathode and the common anode of the diodes D1 and D2 is clamped by the Zener diode D5, the ripple is suppressed by the smoothing capacitor C2, and applied to the communication circuit 104 as an operation power supply.

  FIG. 1 shows a case where the operating power of the communication circuit 104 of the slave unit 100 is 5 m, 2 mA, and 10 mW. A current is also supplied to the Zener diode D5 for voltage stabilization, and power is consumed by the bridge rectifier circuits D1, D2, D3, and D4 and the surge protection resistors R1 and R2, but only a small power of about 30 mW is required. . Therefore, if the output of the master unit is 2 W, about 50 slave units can be driven simultaneously. The aforementioned surge protection resistors R1 and R2 are small resistors (about 10 to 100Ω) for protecting the circuit by limiting the current when an overvoltage is applied, and an overvoltage is applied to the power lines 102a and 102b. Since there is a case, it is arranged.

Next, a case where AC power is applied to the slave unit 100 via the plug 102 will be described.
When the number of slave units 100 controlled by the master unit is 50 or more, power is insufficient when a high-frequency signal supplied from the master unit is supplied to a large number of slave units. Similarly, when the transmission loss on the power line is large, the power is insufficient. In such a case, even if the high-frequency signal applied to the parallel resonant circuit 103 is rectified by the bridge rectifier circuits D1, D2, D3, and D4, sufficient power for operating the communication circuit 104 cannot be obtained. . Therefore, in the present embodiment, the operating power of the slave unit 100 is supplied from an AC power source input via the plug 102.

Since the frequency of the AC power supply is low, there is no voltage drop in the parallel resonance circuit 103 of the tuning coil L1 and the tuning capacitor C1. Further, there are few components flowing through the bypass capacitor C4.
The AC power supply includes the apparatus main body 101 and the power supply circuit (surge protection resistor R3, current limiting capacitor C3, rectifier diode D6 (second rectifier diode), D7 (first rectifier diode), Zener diode D5. , And a smoothing capacitor C2. The operation at this time will be described by dividing it into steps (1) and (2).

(1) When the potential at point A-point B in FIG. 1 changes from the negative peak to the positive peak, point A → surge protection resistor R3 → current limiting capacitor C3 → rectifying diode D7 → zener diode D5, a parallel circuit of the smoothing capacitor C2 and the communication circuit 104, a parallel resonance circuit 103 of the tuning coil L1 and the tuning capacitor C1, and a current flow through the forward path of point B.
Thereby, a current is supplied to the parallel circuit of the Zener diode D5, the smoothing capacitor C2, and the communication circuit 104, and the smoothing capacitor C2 is charged. The current limiting capacitor C3 was initially charged but then discharged and then charged in the reverse direction.

  (2) When the potential at point A-point B in FIG. 1 changes from the peak in the positive direction to the peak in the negative direction, point B → parallel resonant circuit 103 of tuning coil L1 and tuning capacitor C1 → rectifier diode D6 → Current limiting capacitor C3 → Surge protection resistor R3 → Current flows through point A. The current limiting capacitor C3 is provided to determine the magnitude of converting the AC voltage of the power line into a DC current and outputting the current to the communication circuit. The initially charged capacitor is discharged, and then the reverse direction Is charged. In this case, power is supplied to the communication circuit 104 from the smoothing capacitor C2. Here, the surge protection resistor R3, like the surge protection resistors R1 and R2, is a small resistor (about 10 to 100Ω) for protecting the circuit by limiting the overcurrent, and the power lines 102a and 102b have an overvoltage. May be applied.

  In the example of FIG. 1, the current limiting capacitor C3 repeats the operation of being charged by the AC power source and the operation of discharging toward the AC power source. Even if energy is stored in the current limiting capacitor C3 from the AC power source, the energy stored by discharging toward the AC power source is returned, and the current limiting capacitor C3 does not consume energy. Therefore, the power consumption of the communication circuit 104, the Zener diode D5, the rectifying diodes D6 and D7, and the surge protection resistor R3 of the slave unit 100 is reduced to about 30 mW as a whole.

  As described above, the high-frequency signal from the secondary coil L2 of the tuning coil L1 is rectified by the bridge rectifier circuits D1 to D4 and connected as an operation power supply between the power supply terminal of the communication circuit 104 and the reference potential. In the bridge rectifier circuits D1 to D4, when an overvoltage is applied to the AC power supply, a potential that greatly deviates from the potential between the power supply terminal of the communication circuit 104 and the reference potential is applied to the input terminals S1 and S2 of the communication circuit 104. It also has a function to lose.

  Since the input impedance at a high frequency is kept high by the parallel resonance circuit 103 of the tuning coil L1 and the tuning capacitor C1 when viewed from the input of the slave unit 100, the master unit drives a plurality of slave units at a high frequency. Has become easier. In addition, the apparatus main body 101 does not generate noise, but when the same frequency component as the high frequency signal leaks on the consumption current, it is bypassed by the bypass capacitor C4.

  Further, the parallel resonance circuit 103 of the tuning coil L1 and the tuning capacitor C1 functions as a trap circuit, and functions to suppress the level leaking to the AC power line. As a result, even if a large number of devices are connected, noise generated from the device main body 101 can be prevented from interfering with communication between the parent device and the child device 100.

The communication circuit 104 receives and responds to commands and data sent from the master unit by receiving and detecting high frequency signals from the master unit from the S1 and S2 terminals. The response from the communication circuit 104 is output from the S1 and S2 terminals.
In the example described above, when the power supply frequency is 50 Hz and 100 Vrms, the current limiting capacitor C3 may be selected as 0.22 μF, and even when 50 slave units 100 are connected in parallel, the power consumption can be reduced to 2 W or less.

(Second Embodiment)
Next, a second embodiment of the power line transmission device will be described with reference to FIG.
The slave unit 200 shown in FIG. 2 is an example in which the circuit for rectifying the AC power supply of the slave unit 100 shown in FIG. 1 is a half-wave rectifier circuit, but a double-wave rectifier (full-wave rectifier) circuit. It is. In FIG. 2, the same components as those in FIG. 1 are denoted by the same reference numerals.

First, an operation in the case where AC power is not applied via the plug 102 and only a high frequency signal from a parent device (not shown) is sent to the child device 200 will be described.
The parallel resonance circuit 103 including the tuning coil L1 and the capacitor C1 resonates with a high-frequency signal (for example, 400 KHz) transmitted from the parent device. Since the bypass capacitor C4 and the parallel resonant circuit 103 are connected in series, the high-frequency signal sent from the parent device via the power lines 102a and 102b is applied to the parallel resonant circuit 103 and connected in parallel to the bypass capacitor C4. It is not applied to the apparatus main body 101 side.

  The high frequency signal applied to the parallel resonant circuit 103 is applied to the bridge rectifier circuits D1, D2, D3, and D4 via the surge protection resistors R1 and R2, and the common cathode of the diodes D3 and D4 and the common of the diodes D1 and D2 The direct current output taken out between the anodes is clamped by the Zener diode D5, the ripple is suppressed by the smoothing capacitor C2, and applied to the communication circuit 104 as an operation power supply.

  The example of FIG. 2 also shows a case where the operating power of the communication circuit 104 of the slave device 200 is 5 m, 2 mA, and 10 mW. A current is also supplied to the Zener diode D5 for voltage stabilization, and power is consumed by the bridge rectifier circuits D1, D2, D3, D4 and the resistors R1, R2, but the power consumption is about 30 mW. Therefore, if the output of the master unit is 2 W, about 50 slave units 200 can be driven simultaneously.

  The surge protection resistors R1 and R2 are small resistors (about 10 to 100Ω) for protecting the circuit by limiting the current when an overvoltage is applied, and an overvoltage may be applied to the power lines 102a and 102b. Because there is.

Next, a case where AC power is applied to the slave device 200 via the plug 102 will be described.
When the number of slave units 200 controlled by the master unit is 50 or more, the high frequency signal supplied from the master unit is insufficient to supply power to a large number of slave units. Similarly, even when the transmission loss on the power line is large, even if the high-frequency signal applied to the parallel resonant circuit 103 is rectified by the bridge rectifier circuits D1, D2, D3, and D4, it is sufficient to operate the communication circuit 104. Electric power may not be obtained.

In such a case, the operating power of the slave unit 200 is supplied from an AC power source input via the plug 102.
Since the frequency of the AC power supply is low, there is no voltage drop in the parallel resonance circuit 103 of the tuning coil L1 and the tuning capacitor C1. Further, there are few components flowing through the bypass capacitor C4. The AC power source includes the apparatus main body 101 and a power supply circuit (surge protection resistor R3, current limiting capacitor C3, rectifier diodes D6 and D7, smoothing capacitor C2, Zener diode D5, bridge rectifier circuits D1, D2, D3 and D4, surge protection Applied to resistors R1 and R2.

The operation when the operating power of the slave unit 200 is supplied from the AC power source will be described in steps (1), (2), (3), and (4) with reference to FIG.
(1) As indicated by reference numeral 51, while the amplitude increases when the point A side of the power supply is positive, the current supplied from the point A side of the power supply is the point A side → surge protection resistor R1 or surge protection resistor R2 and series circuit of tuning coil L1 → either bridge rectifier circuit D3 or D4 → Zener diode D5, parallel circuit of smoothing capacitor C2 and communication circuit 104 → rectifier diode D6 → current limiting capacitor C3 → surge protection A current flows in the route from the resistor R3 to the point B. That is, the current limiting capacitor C3 is charged.

Whether the current flows through the surge protection resistor R1 or the series circuit of the surge protection resistor R2 and the tuning coil L1 depends on the phase of the high-frequency voltage of the parallel resonance circuit 103.
Similarly, whether the current flows through D3 or D4 of the bridge rectifier circuit is determined by the phase of the high-frequency voltage of the parallel resonant circuit 103.
That is, as indicated by reference numeral 51, when the voltage between A and B is positive and the voltage amplitude between the power supplies A and B increases, power is supplied to the communication circuit 104 while charging the current limiting capacitor C3 with energy. doing.

(2) As indicated by reference numeral 52, when the point A of the power source is positive and the amplitude decreases, the charge charged in the current limiting capacitor C3 is changed to the rectifier diode D7, the zener diode D5, and the smoothing capacitor C2. And the parallel circuit of the communication circuit 104, either D1 or D2 of the bridge rectifier circuit, either the surge protection resistor R1 or the series circuit of the surge protection resistor R2 and the tuning coil L1, the point A side of the power source, the power source, the power source The current flows from the point B side to the surge protection resistor R3 → the current limiting capacitor C3. That is, the current limiting capacitor C3 is discharged.

Which of the rectifying diodes D1 and D2 flows depends on the phase of the high-frequency voltage of the parallel resonant circuit 103.
Similarly, whether the current flows through the surge protection resistor R1 or the series circuit of the surge protection resistor R2 and the tuning coil L1 depends on the phase of the high-frequency voltage of the parallel resonance circuit 103.
That is, as indicated by reference numeral 52, when the power supply between A and B is positive and the voltage amplitude between A and B decreases, the charge charged in the capacitor C3 is discharged and the energy is returned to the power supply. Power is supplied to the communication circuit 104.

(3) As indicated by reference numeral 53, when the point B side of the power supply is positive and the amplitude increases, the current supplied from the point B side is the surge protection resistor R3 → current limiting capacitor C3 → rectifying diode D7. → Parallel circuit of Zener diode D5, smoothing capacitor C2 and communication circuit 104 → D1 or D2 of bridge rectifier circuit → Surge protection resistor R1 or series circuit of surge protection resistor R2 and tuning coil L1 → A of power supply It flows to the point side.

That is, the current limiting capacitor C3 is charged. Which of the bridge rectifier circuits D1 and D2 flows depends on the phase of the high-frequency voltage of the parallel resonant circuit 103.
Similarly, whether the current flows through the surge protection resistor R1 or the series circuit of the surge protection resistor R2 and the tuning coil L1 depends on the phase of the high-frequency voltage of the parallel resonance circuit 103.
That is, as indicated by reference numeral 53, when the voltage between the power supplies A and B is negative and the voltage amplitude between the voltages A and B increases, the power is supplied to the communication circuit 104 while charging the current limiting capacitor C3. doing.

(4) As indicated by reference numeral 54, when the point B side of the power source is negative and the amplitude is reduced, the charge charged in the current limiting capacitor C3 is the current limiting capacitor C3 → surge protection resistor R2 → power source Point B side → Power source → Point A side of the power source → Surge protection resistor R1 or Surge protection resistor R2 and either series circuit of tuning coil L1 → Bridge rectifier circuit D3 or D4 → Zener diode D5, smoothing capacitor C2 And the parallel circuit of the communication circuit 104 → the rectifying diode D6 → the current limiting capacitor C3.

That is, the current limiting capacitor C3 is discharged. Whether the current flows through the surge protection resistor R1 or the series circuit of the surge protection resistor R2 and the tuning coil L1 depends on the phase of the high-frequency voltage of the parallel resonance circuit 103.
Similarly, which of the rectifying diodes D1 and D2 flows is determined by the phase of the high-frequency voltage of the parallel resonant circuit 103.

That is, as indicated by reference numeral 54, when the voltage between A and B of the power source is negative and the voltage amplitude between A and B decreases, the charge charged in the capacitor C3 is discharged and the energy is returned to the power source while communicating. Power is supplied to the circuit 104.
The surge protection resistor R3 is a small resistor (about 10 to 100Ω) for protecting the circuit by limiting overcurrent in the same manner as the surge protection resistors R1 and R2, and an overvoltage is applied to the power lines 102a and 102b. There are cases where it is arranged.

  The example of FIG. 2 shows an example in which the operating power of the communication circuit 104 of the slave device 200 is 5 V, 2 mA, and 10 mW. Current is also supplied to the Zener diode D5 for voltage stabilization, and power is consumed by the bridge rectifier circuits D1, D2, D3, D4, the surge protection resistors R1, R2, R3, and the rectifier diodes D6, D7. The power is about 30mW.

As described above, the high frequency signal of the tuning coil L1 is rectified by the bridge rectifier circuits D1 to D4 and connected to the power supply terminal of the communication circuit 104 and the reference potential side as in the example of FIG. Yes.
In the bridge rectifier circuits D1 to D4, when an overvoltage is applied to the AC power supply, a potential that greatly deviates from the potential between the power supply terminal of the communication circuit 104 and the reference potential is applied to the input terminals S1 and S2 of the communication circuit 104. It also has a function to lose.

  Since the input impedance at a high frequency is kept high by the parallel resonance circuit 103 of the tuning coil L1 and the tuning capacitor C1 when viewed from the input of the slave unit 200, the master unit drives a plurality of slave units at a high frequency. Has become easier. In addition, the apparatus main body 101 does not generate noise, but when the same frequency component as the high frequency signal leaks on the consumption current, it is bypassed by the bypass capacitor C4.

  Further, the parallel resonance circuit 103 of the tuning coil L1 and the tuning capacitor C1 functions as a trap circuit, and functions to suppress the level leaking to the AC power line. Thereby, even if a large number of devices are connected, it is possible to prevent noise generated from the device main body 101 from interfering with communication between the parent device and the child device 200.

The communication circuit 104 receives and responds to commands and data sent from the master unit by receiving and detecting high frequency signals from the master unit from the S1 and S2 terminals. The response from the communication circuit 104 is output from the S1 and S2 terminals.
The example shown in FIG. 2 does not increase the number of parts by sharing a part of the circuit that extracts the operating power from the high-frequency signal supplied from the master unit and the circuit that extracts the operating power from the AC power supply. ing. Further, since the circuit for rectifying the AC power supply is a double-wave rectifier circuit, the value of the smoothing capacitor C2 can be made smaller than in the example of FIG. 1, and the secondary coil L2 of the tuning coil L1 is not necessary.

(Third embodiment)
Next, a third embodiment of the power line transmission device will be described with reference to FIG.
The handset 300 shown in FIG. 3 includes a photo moss 105 and a triac 106 with respect to the handset 100 shown in FIG. Since the operation related to the supply of operating power and the response operation are the same as those in the first embodiment, a description thereof will be omitted.

  The child device 100 shown in FIG. 1 is provided with a photo memory 105 and a triac 106, and a device main body 101 and a starting resistor R4 are connected to a point A of the power source. The photo MOS 105 is connected between the VDD terminal and the I / O port of the communication circuit 104 via the resistor R6.

  The gate electrode of the triac 106 is connected to the connection point of the photo moss 105 and the malfunction prevention resistor R5 in the series circuit of the starting resistor R4, the photo moth relay 105, and the malfunction prevention resistor R5. The T1 electrode of the triac 106 is connected to the other end of the apparatus main body 101, and the T2 electrode of the triac 106 and the other end of the malfunction prevention resistor R5 are connected to a connection point between the tuning coil L1 and the bypass capacitor C4.

  With such a configuration, when the photo memory 105 is turned on / off by the communication circuit 104, the triac 106 performs a switching operation in which the current flowing from the point A to the apparatus main body 101 is intermittent in both forward and reverse directions.

  The slave unit 300 according to the present embodiment communicates with the master unit by power line communication, and can control the power supply to the apparatus main body 101 to be turned on and off, and can read the operation state of the apparatus main body 101 by the master unit.

(Fourth embodiment)
Next, a fourth embodiment of a power line transmission device will be described with reference to FIG.
A child device 400 shown in FIG. 4 includes a photo moss 105 and a triac 106 in addition to the child device 200 shown in FIG. Since the operation related to the supply and response of the operating power is the same as that of the second embodiment shown in FIG.

Since the operation through the photo moss 105 is the same as the example shown in FIG. 3, only the difference will be described.
In the example of FIG. 4, the apparatus main body 101 exhibits load characteristics in a resistive manner with respect to the power supply, so that a current flows when the power supply is applied. For this reason, in this example, the connection between the triac 106 and the apparatus main body 101 is changed so that the current flowing to the output side of the starting resistor R4 and the photo mortar 105 after the starting of the triac 106 is eliminated after the starting of the triac 106.

  Similarly to the slave device 300 shown in FIG. 3, the slave device 400 according to the present embodiment communicates with the master device by power line communication to control the power supply to the device main body 101 on and off, and the operation of the device main body 101. The status can be read by the main unit.

(Fifth embodiment)
FIG. 6 shows a fifth embodiment.
In the present embodiment, an example suitable for controlling the operation of a device that operates with a DC voltage obtained by rectifying the power supply voltage, in addition to communication between the parent device and the child device 600 incorporated in the device via the power lines 102a and 102b. It is.

In FIG. 6, the operation of supplying power to the slave unit 600 incorporated in the apparatus will be described.
When operating power is obtained from a high-frequency signal transmitted from the parent device superimposed on the power lines 102a and 102b, the parallel resonance circuit 103 including the tuning coil L1 including the secondary coil L2 and the tuning capacitor C1 has a high-frequency signal (for example, 400 kHz). Is resonating. Since the bypass capacitor C4 and the parallel resonant circuit 103 are connected in series, the high frequency signal sent from the parent device via the power lines 102a and 102b is applied to the parallel resonant circuit 103. Further, a power supply circuit including diodes D8 to D15 connected in parallel to the bypass capacitor C4, resistors R31 and R32, a capacitor C31 (first current limiting capacitor), and a capacitor C32 (second current limiting capacitor) Not applied.

  The high frequency signal applied to the parallel resonant circuit 103 is rectified by the bridge rectifier circuits D1, D2, D3, and D4 from the secondary coil L2 of the tuning coil L1 via the surge protection resistors R1 and R2. The direct current output taken out between the common cathodes of the diodes D3 and D4 and the common anodes of the diodes D1 and D2 is clamped by the Zener diode D5, the ripple is suppressed by the smoothing capacitor C2, and applied to the communication circuit 104 as an operation power supply. ing.

FIG. 7 shows operating waveforms when operating power is obtained from an AC power source supplied from the power lines 102a and 102b via the plug 102, and the operating current flows through the rectifier circuits of the diodes D8 to D11. A) to (c).
FIG. 7A shows the waveform of the AC power supplied from the power lines 102a and 102b. FIG. 7B shows the waveform at point A with point C as the reference potential. FIG. 7C shows the waveform at point B with point C as the reference potential.

  As shown by the arrow 71 in FIG. 7B, when the point A side is positive and the amplitude increases, the point A → the surge protection resistor R31 → the current limiting capacitor C31 → the rectifying diode D12 (first rectifying diode D12) Diode) → smoothing capacitor C2, Zener diode D5, parallel circuit of communication circuit 104 → point C → rectifier diode D9 → parallel resonant circuit 103 → current flows through point B. During this time, the current limiting capacitor C31 is charged.

As indicated by the arrow 72, when the point A is positive and the amplitude is small, the current limiting capacitor C31 → the surge protection resistor R31 → D10 → the device body 101 → the point C → the rectifying diode D14 → the current limiting capacitor. A current flows through C31. During this time, the current limiting capacitor C31 is discharged to supply power to the apparatus main body 101, and the smoothing capacitor C2 supplies operating power to the communication circuit 104.

  In FIG. 7C, as indicated by arrow 73, when point B is positive and the amplitude increases, point B → parallel resonant circuit 103 → surge protection resistor R32 → current limiting capacitor C32 → rectifier diode D13. (Second rectifying diode) → Parallel circuit of smoothing capacitor C2, Zener diode D5 and communication circuit 104 → Current flows from point C → rectifying diode D8 → point A. During this time, the current limiting capacitor C32 is charged.

  As indicated by an arrow 74, when the point B is positive and the amplitude is small, the current limiting capacitor C32 → the surge protection resistor R32 → the rectifying diode D11 → the device body 101 → the point C → the rectifying diode D15 ( Fourth rectifier diode) → Current flows through the current limiting capacitor C32. During this time, the current limiting capacitor C32 is discharged and supplies power to the apparatus main body 101, and the smoothing capacitor C2 supplies operating power to the communication circuit 104.

  When operating power is obtained from an AC power source supplied from the power lines 102a and 102b, the apparatus main body 101 is not operating, and no current is flowing through the rectifier circuits of the rectifying diodes D8 and D9, or the apparatus main body 101 is A case will be described in which operation is performed but operation is performed with the electric charge of the capacitor C5 and no current flows through the rectifier circuits of the rectifier diodes D8 and D9.

As shown in FIG. 8A, AC power supplied from the power lines 102a and 102b is supplied between A and B. FIG. 8B shows the waveform at point A with point C as the reference potential. FIG. 8C shows a waveform at point B with point C as a reference potential.
Only in the first cycle of the supplied AC power source, point A → surge protection resistor R31 → current limiting capacitor C31 → rectifier diode D12 → parallel circuit of smoothing capacitor C2, Zener diode D5 and communication circuit 104 → C point → for rectification A current flows from the diode D9 to the parallel resonant circuit 103 to the point B. During this time, the current limiting capacitor C31 is charged. No current flows through the current limiting capacitor C32.

  From the next cycle, the current limiting capacitor C32 is charged, so the diode D9 is reverse biased. For this reason, as indicated by an arrow 81 in FIG. 8B, when the point A side is positive and the amplitude increases, the point A → the surge protection resistor R31 → the current limiting capacitor C31 → the rectifying diode D12 → the smoothing capacitor C2. Then, the current flows in the parallel circuit of the zener diode D5 and the communication circuit 104 → C point → rectifier diode D15 → current limiting capacitor C32 → surge protection resistor R32 → parallel resonant circuit 103 → B point. During this time, the current limiting capacitor C31 is charged, and the current limiting capacitor C32 is discharged.

  Further, as indicated by an arrow 82, when the point A side is positive and the amplitude is small, the current limiting capacitor C31 → the surge protection resistor R31 → the point A → the power source → the point B → the parallel resonance circuit 103 → the surge protection resistor R32 → Current limiting capacitor C32 → rectifier diode D13 → parallel circuit of smoothing capacitor C2, Zener diode D5 and communication circuit 104 → C point → rectifier diode D14 (third rectifier diode) → current is transferred in the forward path of current limiting capacitor C31 Flowing. During this time, the current limiting capacitor C31 is discharged and the current limiting capacitor C32 is charged. Here, since the current limiting capacitor C31 and the current limiting capacitor C32 are charged, no current flows through the rectifying diode D9.

  As indicated by an arrow 83, when the point B is positive and the amplitude increases, the point B → parallel resonant circuit 103 → surge protection resistor R32 → current limiting capacitor C32 → rectifier diode D13 → smoothing capacitor C2, Zener A current flows through the parallel circuit of the diode D5 and the communication circuit 104 → point C → rectifier diode D14 → current limiting capacitor C31 → surge protection resistor R31 → point A. During this time, the current limiting capacitor C32 is charged and the current limiting capacitor C31 is discharged. During this period, since the current limiting capacitors C31 and C32 are charged, no current flows through the rectifying diode D8.

  As indicated by an arrow 84, when the point B is positive and the amplitude is small, the current limiting capacitor C32 → the surge protection resistor R32 → the parallel resonance circuit 103 → the point B → the power source → the point A → the surge protection resistor R31 → A current flows through the current limiting capacitor C31 → the rectifying diode D12 → the parallel circuit of the smoothing capacitor C2, the Zener diode D5 and the communication circuit 104 → the point C → the rectifying diode D15 → the current limiting capacitor C32. During this time, the current limiting capacitor C31 is charged and the current limiting capacitor C32 is discharged. During this period, since the current limiting capacitors C31 and C32 are charged, no current flows through D8.

  As described above, the current limiting capacitors C31 and C32 are provided in the power supply path to the communication circuit 104 even when the apparatus main body 101 is not operating and no current is flowing through the rectifying circuits of the rectifying diodes D8 and D9. Since it operates as a series of two, the magnitude of the current is limited to half, but during one cycle of the AC power supply, charging and discharging from the initial polarity to the reverse polarity, and the communication circuit during charging and discharging Since the current is supplied to 104, the amount of power supplied to the communication circuit 104 does not change.

  Point C is a reference potential point of the communication circuit 104, and becomes the reference potential of the apparatus main body 101 at the negative output point of the bridge rectifier circuits D8, D9, D10, D11 in order to supply a DC voltage to the apparatus main body 101. Therefore, it is not necessary to pass a photocoupler between the communication circuit 104 and the apparatus main body 101, and it is easy.

(Sixth embodiment)
FIG. 9 shows a sixth embodiment.
The slave device 900 shown in FIG. 9 controls the application of power to the apparatus main body 101 by controlling the open / close circuit SW1 such as a photo mortar by the output signal of the communication circuit 104, for example, as shown in FIG. It is an example.

  In this example, the state of application of power to the apparatus main body 101 is detected by a resistor, a current limiting capacitor C33, a diode D16, and a transistor Tr, and can be read from the parent device via the communication circuit 104. This is an example in which control by power line transmission is added to the apparatus main body 101 that is not assumed to be controlled by power transmission, so that ON / OFF operation control and power supply application state can be read. According to the present invention, power consumption during standby can be sufficiently reduced, so that a large number of devices can be controlled by power line transmission.

  As described above, in the power line transmission devices of the first embodiment to the sixth embodiment, a DC power is generated by receiving an AC voltage applied between the input points of the power lines 102a and 102b to the slave unit. A power supply circuit for supplying operating power is configured by combining a current limiting capacitor and a diode. As a result, the circuit configuration can be simplified and the power consumption can be reduced.

  In each of the above-described embodiments, the bridge rectifier circuits D1, D2, D3, and D4 are provided for rectifying the high-frequency signal applied to the parallel resonant circuit 103 that resonates with the high-frequency signal transmitted from the master unit. The high frequency signal transmitted from the parent device can be used as the operating power. Thereby, both the DC power obtained by rectifying the AC voltage obtained from the power lines 102a and 102b and the power from the parent device can be shared.

  In each of the embodiments described above, the power consumed by the slave unit can be significantly reduced, so communication between the master unit connected via the power lines 102a and 102b and the slave unit incorporated in the device is possible. In this case, it is possible to communicate with many slave units without using an AC power source. Thereby, for example, before applying the AC voltage to the power line immediately after the installation work, the slave unit can be operated only by the high-frequency signal from the master unit. For example, after the installation work is completed, the connection and operation can be confirmed before applying the AC voltage.

Specific examples of applications include lighting, dimming, and confirmation of operating status for many lighting devices, such as lighting in tunnels, depending on the time of day, weather, and traffic of vehicles. It can be used when writing / reading the operation history and maintenance information of the lighting equipment. In such a use, it is possible to incorporate a slave unit into about 1000 lighting devices (when installed in 250 units in four rows with a length of 1 km) and communicate with the master unit by power line transmission.
In addition to this, even when targeting office and factory lighting equipment, air conditioning equipment, etc., it is possible to operate many slave units by incorporating slave units into many devices and communicating with the master unit via power line transmission. It becomes.

(Modification)
In the first to sixth embodiments described above, an example in which the base unit rectifies the power from the high-frequency signal superimposed on the power lines 102 a and 102 b to obtain the operating power of the communication circuit 104. explained. In the modification described below, the high-frequency signal superimposed on the power lines 102a and 102b by the parent device is not used for the operating power.

(First modification)
FIG. 10 is a modified example corresponding to FIG. 1 and shows a configuration example of the slave unit 110 that does not include the bridge rectifier circuits D1, D2, D3, and D4 that rectify the high-frequency signal obtained from the parallel resonant circuit 103.

(Second modification)
FIG. 11 is a block diagram illustrating a configuration example of a slave unit 610 that is a modification corresponding to the slave unit 600 of FIG.

(Third Modification)
FIG. 12 is a block diagram showing a configuration example of a slave unit 310 which is a modification corresponding to the slave unit 300 of FIG.

(First use example)
Next, a first usage example will be described with reference to FIG.
In this example, power is supplied to the power lines 1341 and 1342 via the switchboard 1310 and the filter 1320, and the power lines 1341 and 1342 and the parent device 1360 are connected by a coupling circuit 1350. The power line devices 1341 and 1342 are connected to the slave unit built-in devices 1371, 1372, and 137, and the on / off control of the slave unit built-in device is performed according to the high frequency signal sent from the master unit 1360, as described above. And so on. In the example of FIG. 13, a terminator 1380 is provided between the power lines 1341 and 1342 at the end of the area where power line communication is performed to prevent reflected waves.

(Second usage example)
Next, a second usage example will be described with reference to FIG.
In this example, a master unit 1420 is disposed between the switchboard 1410 and the power lines 1401 and 1402. Further, a plurality of slave unit built-in devices 1431, 1432, 1433, 1434... Are connected to the power lines 1401 and 1402, and sensors 1441 and 1442 are provided for each predetermined number of slave unit built-in devices.

  With such a configuration, the operation of the device is controlled by transmitting a control signal from the master unit 1420 to the slave unit built-in devices 1431, 1432, 1433, 1434... According to the outputs of the sensors 1441 and 1442. Can do. Specifically, the slave unit built-in devices 1431, 1432, 1433, 1434... May be slave unit built-in air conditioners, and the sensors 1441 and 1442 may be temperature sensors. In this case, optimal operation control can be performed according to the environment where each air conditioner is installed.

Moreover, the subunit | mobile_unit built-in apparatus 1431, 1432, 1433, 1434 ... may be a subunit | luminance with a built-in subunit | mobile_unit, and sensor 1441,1442 may be an illumination intensity sensor. In this way, it becomes possible to intermittently control a large number of lighting fixtures or to control the brightness to be constant.
If the sensors 1441 and 1442 are temperature sensors, they can be used for operation control of the air conditioner.

100 handset 101 device main body 102 plug 102a, 102b power line 103 parallel resonance circuit 104 communication circuit 105 photo moss relay 106 triac C3 current limiting capacitor C2 smoothing capacitor D1-4 bridge rectifier circuit D5 Zener diode D6 second rectifier diode D7 first Rectifier diode

Claims (4)

A power line transmission device including a power supply circuit that is used in addition to an apparatus main body connected to a power line and that generates an AC power by receiving an AC voltage from the power line,
A series circuit disposed between the input points of the first and second AC voltages of the power line, comprising a parallel resonant circuit including a tuning coil having a secondary coil and a tuning capacitor, and a bypass capacitor. A first series circuit;
A communication circuit that receives and responds from the secondary coil of the tuning coil with a high-frequency signal transmitted superimposed on the AC voltage of the power line;
A current limiting capacitor for converting an AC voltage of the power line into a direct current and outputting the direct current to the communication circuit; a first rectifier having an anode connected to the current limiting capacitor and a cathode connected to a power supply terminal of the communication circuit; A second series circuit constituted by a diode for use;
A parallel circuit composed of a Zener diode and a smoothing capacitor connected between a power supply terminal of the communication circuit and a reference potential;
A cathode connected to a connection point between the current limiting capacitor and the anode of the first rectifying diode, and a second rectifying diode having an anode connected to a reference potential side of the communication circuit,
The second series circuit and the parallel circuit are connected in series, and the second rectifying diode is connected between a connection point of the current limiting capacitor and the first rectifying diode and the reference potential. And configuring a power supply circuit, connecting the power supply circuit to both ends of the bypass capacitor,
While supplying power to the apparatus body from both ends of the bypass capacitor,
A power line transmission device, wherein a current applied between a power supply terminal of the communication circuit and a reference potential is limited and supplied by the current limiting capacitor. A bridge rectifier circuit that rectifies a high-frequency signal applied to the parallel resonant circuit from a secondary side of the tuning coil;
2. The power line transmission device according to claim 1, wherein a direct current output rectified by the bridge rectifier circuit is supplied between a power supply terminal of the communication circuit and a reference potential. A power line provided with a power supply circuit that is used in addition to an apparatus main body connected to a power line and generates a DC power by receiving an AC voltage applied between input points of the first and second AC voltages of the power line. A transmission device,
A series circuit disposed between input points of the first and second AC voltages of the power line, the first series circuit including a parallel resonance circuit including a tuning coil and a tuning capacitor, and a bypass capacitor. When,
A communication circuit that receives and responds to a high-frequency signal transmitted from the parallel resonant circuit connected to the first input terminal of the power line superimposed on the AC voltage of the power line;
A parallel circuit composed of a Zener diode and a smoothing capacitor connected between a power supply terminal of the communication circuit and a reference potential;
A bridge rectifier circuit that rectifies the high-frequency signal transmitted by being superimposed on the AC voltage of the power line from the parallel resonant circuit, and applies the rectified DC output as a power source of the communication circuit;
A current limiting capacitor having one end connected to the second input terminal of the power line;
A first rectifying diode connected to the anode at the other end of the current limiting capacitor and connected to the power supply terminal of the communication circuit and connected to the cathode;
A second diode having a cathode connected to the other end of the current limiting capacitor and an anode connected to a reference potential of the communication circuit;
While supplying power to the apparatus body from both ends of the bypass capacitor,
A power line transmission device, wherein a current applied between a power supply terminal of the communication circuit and a reference potential is limited and supplied by the current limiting capacitor. A power line transmission device including a power supply circuit that is used in addition to an apparatus main body connected to a power line and that generates an AC power by receiving an AC voltage from the power line,
A series circuit disposed between the input points of the first and second AC voltages of the power line, comprising a parallel resonant circuit including a tuning coil having a secondary coil and a tuning capacitor, and a bypass capacitor. A first series circuit;
A full-wave rectification of an alternating voltage applied from both ends of the bypass capacitor, and a power supply circuit that is applied to the device body,
A communication circuit that receives and responds from the secondary coil of the tuning coil with a high-frequency signal transmitted superimposed on the AC voltage of the power line;
One end of the power line is connected to the first terminal, the other end is connected to the anode of the first rectifying diode, and the anode is connected to the first current limiting capacitor. And a second series circuit composed of a first rectifying diode having a cathode connected to the power supply terminal of the communication circuit;
A second current limiting capacitor having one end connected to the second terminal of the power line via the parallel resonant circuit and the other end connected to an anode of a second rectifying diode; A third series circuit comprising an anode connected to a current limiting capacitor and a second rectifying diode having a cathode connected to a power supply terminal of the communication circuit;
A parallel circuit composed of a Zener diode and a smoothing capacitor connected between a power supply terminal of the communication circuit to which the cathodes of the first and second rectifying diodes are connected in common and a reference potential of the communication circuit. When,
A third rectifying diode having a cathode connected to a connection point between the first current limiting capacitor and the first rectifying diode and having an anode connected to a reference potential of the communication circuit;
A fourth rectifying diode having a cathode connected to a connection point between the second current limiting capacitor and the second rectifying diode and having an anode connected to a reference potential of the communication circuit;
The reference potential of the communication circuit is connected to the output point on the reference potential side of the power supply circuit to be applied to the device body,
A power line transmission device, characterized in that a current applied between a power supply terminal of the communication circuit and a reference potential is supplied by being limited by the first and second current limiting capacitors.

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