JPS6231572B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power line transport control system that uses a power line of a commercial power source as a signal line to transmit control data for controlling the phase of a load.

In general, this type of power line carrier control method (hereinafter abbreviated as control method) connects a transceiver to the power line of a commercial power source, and the receiver receives control data for controlling the phase of the load transmitted from the transmitter. The phase of a load such as a lighting device connected to the receiver is controlled based on this control data, and in order to check the operating status of the load on the remote control side, that is, on the transmitter side, the phase of the load is controlled. Operation confirmation data indicating the operating status is sent back from the receiver to the transmitter.

Figure 1 shows a schematic configuration diagram of a remote control system using this type of control method, in which 2 is a transmitter that transmits a transmission signal V _S whose carrier high frequency is amplitude-modulated using control data D _C , and 3 is a commercial Power supply AC power line 1
A and 1b receive the transmission signal V _S transmitted through the terminals a and 1b to reproduce the control data D _C , and based on the control data D _C , the ON period of the load control switching element, that is, the load control thyristor 4 such as a triac is determined. θ ₂ is controlled, and the phase of the load 5 is controlled.

Figure 2a shows an example of the transmission signal V _S ,
The transmission signal V _S includes 1-bit start data D _S that puts the receiver 3 into operation, and 4 that accesses a specific receiver 3 from among the plurality of receivers 3 connected to the power lines 1a and 1b. It is composed of bit channel data D _A and 4 bit control data D _C for controlling the phase of the load 5, and each data D _S , D
Each bit of _A and D _C is composed of four sub-bits S ₁ to S ₄ as shown in FIG. Each sub bit S ₁
~ _S9 is transmitted to the transmission sections Ha~Hd, which are divided into four, by dividing the half cycle H of the commercial power supply AC, and the data D
Each bit of _S , D _A and D _C is transmitted corresponding to each half cycle H of the commercial power supply AC. In the embodiment, sub-bits S ₁ to _{S 4} are defined as "1" when the carrier high frequency F is present and "0" when it is not present, and the sub-bit configuration of the start data D _S is "0101" and the channel The sub-bit configuration of bit value ``1'' in data D <sub>A</sub> and control data D <sub>C</sub> is defined as ``0111'', and the sub-bit configuration of bit value ``0'' is defined as ``0100''. Figure 3 shows the start data _DS and channel. It shows the transmission status of the main part of data D _A.

FIG. 2b shows the return signal V _B which is the control data _{D C received} by the receiver 3.
4-bit operation confirmation data D formed based on
The return signal V _B is a signal obtained by modulating the carrier high frequency F at _O , and is transmitted from the receiver 3 to the transmitter 2 immediately after receiving the transmission signal V _S . This return signal V _B
The transmission state is similar to that of the transmission signal V _S shown in FIG. 3, and each bit of the operation check data D _O is composed of four sub-bits S ₁ to S ₄ .

By the way, in such a remote control system, in order to simplify the wiring when connecting the receiver 3 and the load 5 to the power supply lines 1a and 1b, the receiver 3 is
By connecting a series circuit with the load 5 in parallel between the power lines 1a and 1b, and supplying power to the receiver 3 with a DC voltage obtained by rectifying and smoothing the voltage across the load control thyristor 4, the power supply line of the receiver 3 is There were some that omitted the ``2-wire'' type. In this case, during the ON period θ ₂ of the thyristor 4, the commercial power AC voltage is applied to the load 5, and the current as shown by diagonal lines in FIG.
i ₅ flows to the load 5 to supply power to the load 5, while the commercial power AC voltage is applied to the power supply section of the receiver 3 during the off period θ ₁ of the thyristor 4, as shown in Fig. 4b.
A current i ₃ as shown by diagonal lines flows to supply power to the receiver 3. At this time, as the on period θ ₂ of the thyristor 4 becomes longer, the power supplied to the receiver 3 decreases. Therefore, when the on period θ ₂ of the thyristor 4 becomes longer, for example, if the load 5 is a lighting device, when the load 5 is controlled to be fully lit, the power supplied to the receiver 3 is significantly reduced. Therefore, when the return signal V _B for transmitting the operation check data D _O is returned from the receiver 3, the necessary power is not supplied to the receiver 3, and the operation check data D _O cannot be returned normally. That is, when the power supplied to the receiver 3 is insufficient, the voltage level of the return signal V _B transmitted from the receiver 3 becomes low, and when the impedance between the power lines 1a and 1b is small, the return signal V _B The disadvantage is that the attenuation of the signal becomes large, making it impossible for the transmitter 2 to receive the return signal _VB . The present invention aims to solve the above-mentioned drawbacks.

Examples will be described below using figures. Fifth
The figure is a diagram showing the basic operation of an embodiment of the present invention,
In the same control method as the conventional example described above, the on-period θ ₂ of the thyristor 5 (expressed as a percentage of the half-cycle period θ of the AC power source) is controlled to be equal to or greater than a predetermined value (50% in the case of the embodiment). When the operation confirmation data D _O is returned in the return section X, the ON period θ ₂ of the thyristor 4 in every other half cycle, that is, the first and third half cycles H ₁ and H ₃
is set to a predetermined value (50%) regardless of the control data D _C , and the current i ₅ flowing through the load 5 is as shown in Fig. 5a, and if the on-period θ ₂ of the thyristor 4 is approximately Even when the control is performed based on the control data D _C such that it becomes 100%, there are always half cycles H ₁ and H ₃ in which the on period θ ₂ of the thyristor 4 is 50% within the return section X. Therefore, a current i ₃ as shown in Fig. 5b flows through the power supply section of the receiver, and the commercial power supply AC is rectified and smoothed mainly during the off period θ ₁ of the thyristor 4 in these half cycles H ₁ and H ₃ . DC power is supplied and operation confirmation data D
In the return section X of _O , the necessary power of the receiver 3 is sufficiently secured. Therefore, unlike the conventional example, there is no possibility that the operation check data D _O cannot be returned normally due to insufficient power supplied to the receiver 3. In this case, in the return interval X of the operation check data D _O , the on period θ ₂ of the thyristor 4 is controlled based on the control data D _C in every other half cycle H ₂ , H ₄ , and the load 5 is designed to reduce flicker in the case of lighting devices. Further, since the return section X is usually set short (set to about 2 cycles of commercial power AC), the influence on the phase control characteristics is slight. Incidentally, regardless of the control data D _C , the number of half cycles of the commercial power supply AC that makes the ON interval θ ₂ of the thyristor 4 a predetermined value may be set according to the required power of the receiver 3, and is limited to the embodiment. It's not a thing.

Next, when the on-period θ ₂ of the thyristor 4 is controlled to be 50% or less and a current i ₅ as shown in FIG. ₁ is naturally always 50% or more in each half cycle H ₁ and H ₂ of the return section X, so
The power supply section of the receiver 3 has a current as shown in Fig. 5d.
i ₃ will flow, and sufficient power will be supplied to the receiver 3. Therefore, the on period θ of thyristor 4
₂ , it is sufficient to always control based on the control data _D.sub.C.

FIG. 6 shows the circuit configuration of the receiver 3 for realizing the control method according to the present invention. In addition,
As the transmitter 2, a commonly used one may be used, so a description thereof will be omitted. In the figure, 30 is a modulation/demodulation section, and the modulation/demodulation section 30 transmits a transmission signal V made of an analog signal transmitted via power lines 1a and 1b.
A demodulation circuit that performs tuning amplification and detection of _S and outputs sub-bit data S ₁ to _{S 4} made up of digital signals, and data converted from each bit of the operation check data D _O to sub-bit data S ₁ to S ₄ . It consists of a modulation circuit that modulates the carrier high frequency F with a signal and then amplifies the power, and receives the transmission signal V _S and transmits the return signal V _B. 31 is a zero-cross detection section, which generates a basic clock _P0 synchronized with the zero-cross point of the commercial power supply AC. Reference numeral 32 denotes a divided clock generating section, which generates a divided clock P4, which divides the half cycle H of the commercial power supply AC into _four , based on the basic clock _P0 . Each circuit of receiver 3 uses this divided clock _P4 .
operate according to 33 is a received data reproducing unit, which discriminates sub-bit data S ₁ to _{S 4} output from the demodulation circuit of the demodulation unit 30 and converts it into start data D.
When _S is detected, subsequent sub-bit data S ₁
~ _S4 is converted into channel data D _A or control data D _S , and the channel data D _A is input to the channel determining section 34 and the control data D _C is input to the control data determining section 35. The channel determination section 34 compares the channel data DA _{' set in the channel setting section 36 with the received channel data DA ,} and when both channel data _DA ' match,
Coincidence signal V _A that operates the control data determination unit 35
Output. When the control data determining section 35 receives the coincidence signal V _A , the received data reproducing section 33
The 4-bit control data D _C outputted from the controller is read and inputted to the operation confirmation data creation section 42, the on-period determination section 37, and the trigger pulse setting section 38. The on-period determination unit 37 determines whether the control data D _C sets the on-period θ ₂ of the thyristor 4 to 50% or more, and if the control data D _C sets the on-period θ 2 of the thyristor 4 to 50% or more, the trigger is changed. Signal V _T
Output. When the trigger change signal V _T is input to the trigger pulse setting unit 38, the ON period θ ₂ of the thyristor 4 in the first and third half cycles H ₁ and H ₃ of the return section X of the operation check data D _O is controlled. A trigger control signal set to 50% is output regardless of the data D _C , and the ON period θ ₂ of the thyristor 4 is changed only during the first and third half cycles H ₁ and H ₃ of the return section X from the trigger pulse generator 38. 50% and the on-period θ of thyristor 4 in the other half cycles H ₂ and H ₄
A trigger pulse P _T having a value of ₂ based on the control data D _C is output, and the on-period θ ₂ of the thyristor 4 is changed to the fifth
It is controlled as shown in Figure a. On the other hand, when the trigger change signal V _T is not output from the on-period determining section 37, the trigger pulse setting section 38 always sends a trigger control signal based on the control data D _C even in the return period X of the operation check data D _O. is output, and the on period _θ2 of the thyristor 4 is controlled by the trigger pulse generator 39 and the triax drive unit 40 as shown in FIG. 5c. A power supply section 14 rectifies and smoothes the voltage across the thyristor 4 to make it a constant voltage, and supplies DC power to each circuit of the receiver 3. Reference numeral 42 denotes an operation check data creation unit, which creates operation check data D _O based on the control data D _C output from the control data discrimination unit 35 and converts the operation check data D _O into sub-bits S ₁ to S ₄ . Output the return data D _B. A return signal V _B is formed by the modulation/demodulation section 30 using this return data D _B , and the power supply line 1a,
1b. This return signal V _B is the power line 1
a, 1b at the receiving section of the transmitter 2,
The operation confirmation data D _O is reproduced to monitor the operating state of the receiver 3, that is, the operating state of the load 5, on the transmitter 2 side.

The present invention is configured as described above, and the operation confirmation data indicating the operating state of the load is sent back from the receiver to the transmitter, and is received by a DC power source in which the voltage across the load control switching element is rectified and smoothed. In a power line transfer control system that supplies power to a device, when the on-period of the switching element is equal to or greater than a predetermined value, the on-period of the switching element in the operation confirmation data return section becomes the predetermined value regardless of the load control data. As a result, even when the on period of the thyristor controlled based on the control data becomes long, that is, when the load is a lighting device, even when the load is controlled to be fully lit, the receiver There is an advantage that the supplied power does not become extremely small, and the receiver is always supplied with enough power to normally return operation confirmation data.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a power line transport control system according to the present invention, FIGS. 2a, b, and 3 are explanatory diagrams of the same operation, and FIGS. 4a, b are diagrams showing problems in the conventional example. 5A to 5D are explanatory diagrams of the operation of one embodiment of the present invention, and FIG. 6 is a diagram showing an example of the circuit configuration of a receiver for realizing the same operation. 1a and 1b are power supply lines, 2 is a transmitter, 3 is a receiver, 4 is a switching element, and 5 is a load.

Claims (1)

[Claims] 1. A transmitter/receiver is connected to a power line of a commercial power source, and each bit of control data for controlling the phase of the load is transmitted from the transmitter to the receiver in correspondence with each half cycle of the commercial power source, In the power line carrier control method, operation confirmation data indicating the operating status of the load is sent back from the receiver to the transmitter, and the receiver is supplied with power using a DC power supply that has rectified and smoothed the voltage across the switching element for load control. A power line transfer control system characterized in that when the on-period of the element is equal to or greater than a predetermined value, the on-period of the switching element in the return section of operation confirmation data is set to the predetermined value regardless of load control data. 2. The power line according to claim 1, characterized in that the on-period of an appropriate number of half-cycles of the switching elements is set to a predetermined value in the return section of the operation check data over multiple cycles of the commercial power supply. Conveyance control method.