JPH0315762B2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention is directed to a device having a plurality of terminal devices that identifies a control level signal from a new machine and controls a load according to the control level signal. The present invention relates to a transmission control device.

(Conventional technology) Conventionally, when transmitting and controlling a remote lighting load,
For example, in the lighting control system diagram shown in Figure 1, the main unit 1 has a power line 2 and a signal transmission line 3.
Each terminal device 4 is connected through the terminal device 4, and a lighting load 5 is connected to each terminal device 4. Then, the base unit 1 transmits the start signal, address signal, and dimming signal to each terminal via the signal transmission line 3 as shown in the transmission format of FIG. Each terminal device 4 identifies the transmitted signal and adjusts the AC voltage supplied to the lighting load 5 by controlling the phase angle according to the dimming signal as a control level signal of its own address. Performs light control.

In such a system, as shown in FIG. 3, a conventional terminal device 4a connects a microcomputer 15 to a power supply line 2a and a signal transmission line 3a through a zero cross circuit 13 and an input interface 14, respectively. A clock circuit 16 is connected to this microcomputer 15, and a lighting load 5a is connected via a switching circuit 17.
7, the power supply line 2a is connected thereto.
Then, the microcomputer 15 of each terminal 4a inputs the transmission signal from the signal transmission line 3a through the input interface 14, synchronizes with the start signal, identifies the address signal and the dimming signal, and performs its own adjustment. Obtaining optical signal. This dimming signal is an N-bit coded signal; for example, if it is 6 bits, dimming control in 2 ⁶ =64 steps is possible. Further, the microcomputer 1
5 is a switching circuit 17 which inputs the zero cross signal from the zero cross circuit 13, measures the time from the input of this zero cross signal, and outputs the control output after a time corresponding to the dimming signal as the control level signal.
The lighting load 5a is outputted to control the dimming of the lighting load 5a.

The dimming control method uses, for example, a 6-bit coded signal as the dimming signal, sets 000000 to 100% lighting, 111111 to 0% lighting, and when the power frequency is 50Hz, The 000000 signal is generated when the zero-cross signal is input, and the 111111 signal is generated within a half cycle time from the zero-cross signal input.
It is programmed to output the control output after 10msec.

(Problem to be solved by the invention) However, with this conventional method, when the power frequency becomes 60Hz, there is no problem when lighting at 100%, but a problem occurs when lighting is dimmed at other percentages. . That is, if the ratio of conduction phase angles is the same, the amount of electricity can be made the same even if used at different frequencies, but if the ratio of conduction phase angles is different, the amount of power will change. For example, if the output is set 5msec after the zero cross of the power supply so that the conduction phase angle is 0.5π at 50Hz, the ignition phase angle will be 0.6π after the above 5msec at 60Hz, and the difference in power frequency Since the dimming percentage varies depending on the device, a switching function that can support 50Hz and 60Hz must be added as a countermeasure.

If the switching function is not provided, 0 to 100% of data will be sent from the base unit to each terminal.
It is necessary to create multiple types of control level signals, one for 60Hz and one for 50Hz, and the number of signals becomes enormous, which complicates the signal processing within the base unit.

In addition, as a device that can keep the conduction phase angle constant even at different frequencies, for example,
The configuration of Publication No. 38428 is known.

This connects a resistor to the conduction phase angle control circuit,
The open circuit voltage ratio is set by adjusting the low resistance value of this resistor, and the conduction phase angle is kept constant even if the frequency varies.

However, the configuration disclosed in Japanese Utility Model Application Laid-open No. 50-38428 requires manual switching of the resistance value, which is complicated to operate.

Furthermore, as a device that can automatically keep the conduction phase angle constant even when used at different frequencies, there is known, for example, the device described in Japanese Patent Laid-Open No. 127152/1983.

This has a differentiating circuit connected to the base of an auxiliary transistor, a capacitor connected between the emitter and collector of this auxiliary transistor, and this capacitor connected to a phase control transistor. For example, when used at two different frequencies, 50Hz and 60Hz, the circuit in which the differentiating circuit turns on the auxiliary transistor for a certain period of time is
Hz is less. For this reason, the circuit that discharges the capacitor's charge is smaller at 50Hz, the voltage across the capacitor is higher at 50Hz, and the voltage required to turn on the phase control transistor is higher at 50Hz. In the case of 50Hz, which has a long period, the turn-on time is delayed compared to the case of 60Hz, which has a short period, and the conduction phase angle can be kept constant even if the frequency is different.

However, in the case of the device disclosed in Japanese Patent Application Laid-Open No. 50-127152, since the conduction phase angle is determined by changing the charge of the capacitor in an analog manner, there is a problem that accurate control cannot be performed.

The present invention was made in view of the above problems.
Automatically adjusts the relationship between the AC voltage conduction phase angle of each terminal device in response to any control level signal sent from the parent device, even if the power supply frequency is different, without imposing any signal processing burden on the parent device. It is an object of the present invention to provide a transmission control device that can reliably set the AC voltage conduction phase angle to a constant value and can perform desired AC voltage conduction phase angle control from the base unit to each terminal unit.

[Structure of the Invention] (Means for Solving the Problems) A transmission control device of the present invention includes a transmission line, and a device connected to the transmission line and transmitting a digital transmission signal including an address signal and a control level signal to the transmission line. a plurality of terminal devices connected in parallel to the transmission line, a plurality of loads respectively associated with the terminal devices and energized from an AC power supply, and an AC power supply whose position is controlled by the load. and phase control means for supplying a voltage, and the terminal device receives a zero-cross detection means, a digital transmission signal transmitted from the parent device to the transmission line, and each terminal device has its own address and Control level signal input means inputs a control level signal when the address of the transmission signal matches, and time measurement is started based on the zero cross signal detected by the zero cross detection means, and time measurement is performed until the next zero cross signal. a timer for measuring a half-cycle time of the AC power source by measuring time; and generating a conduction phase angle signal by multiplying the control level signal and the half-cycle time; The device is configured to include a control circuit that controls the phase control means.

(Operation) The present invention transmits a digital transmission signal including an address signal and a control level signal from a base unit to each terminal device via a transmission line. Each terminal inputs a control level signal through a control level signal input means when its own address matches the address of the transmission signal. Further, the timer measures the time for a half cycle of the AC power supply by counting the time until the zero-cross signal detected by the zero-cross detector. Then, a conduction phase angle signal is generated by multiplying the measured half cycle time by a control level signal, and a control circuit controls the phase control means by the conduction phase angle signal. Then, the phase-controlled AC voltage is supplied to the load from the phase control means.

(Embodiment) An embodiment of the transmission device of the present invention will be described below with reference to FIGS. 4 and 7. Note that the system diagrams shown in FIGS. 1 and 2 are the same in this embodiment.

FIG. 4 is a block diagram of each terminal 4b, in which a signal transmission line 3b is connected to a microcomputer 21 as a control circuit via an input interface 22 as control level signal input means, and a latch circuit is connected to the microcomputer 21 as a control circuit. A counter 24 as a time measurement means is connected via 23. Further, a clock circuit 25 is connected to the microcomputer 21 and the counter 24, and a zero cross circuit 26 is connected to the microcomputer 21, the latch circuit 23, and the counter 24,
A power supply line 2b is connected to this zero cross circuit 26. Furthermore, a lighting load 5b is connected to the microcomputer 21 via a switching circuit 27, and a power line 2 is connected to the switching circuit 27.
Connect b.

Then, as shown in FIG. 7, a digital transmission signal including an address signal and a dimming signal as a control level signal is transmitted from the master device 1 to each terminal device 4b, and the microcomputer 21 of each terminal device 4b
inputs a digital transmission signal of its own address from the signal transmission line 3b through the input interface 22, identifies it (FIG. F), and obtains a dimming signal encoded as a percentage of the total conduction. Furthermore, the zero cross output (B in the figure) of the zero cross circuit 26 that detects the zero cross of the power supply voltage (A in the figure) is input to the microcomputer 21, the latch circuit 23, and the counter 24. Clear the latch circuit 23
latches the new counter value of counter 24,
The value is input into the microcomputer 21.
Then, the counter 24 is cleared by the zero cross output (D in the same figure), and the output from the clock circuit 25 (C) in the same figure is counted again from 0. Furthermore, in reality, the latch count is started and the reset is performed at the same time, so there is no time lag (t=
0). Therefore, at the time of zero cross output, the load 5
A count value corresponding to the half cycle time of the alternating current voltage supplied to the terminal b is latched in the latch circuit 23 (see E in the figure). Moreover, the microcomputer 21 is
The output value of the latch circuit 23, that is, the count value corresponding to the half cycle time of the AC voltage, is multiplied by the signal indicating the ratio to the total conduction, which corresponds to the time from the zero cross of the AC voltage to output the conduction phase angle. The frequency of the clock circuit 25 was set to about 1 ms.
processing time.

Then, the microcomputer 21 counts the output of the clock circuit 25 from the time of the output of the zero cross circuit 26, and outputs a conduction phase angle output ((G) in the same figure) when the frequency corresponding to the dimming signal is reached, and switches. Lighting load 5b by circuit 27
The dimming signal is generated by controlling the conduction phase angle of the alternating current voltage supplied to the light source (H in the same figure).

More specifically, for example, if 6 bits are used as the dimming signal and the 000000 signal is
% lights up and 111111 is 0% lit, so
Here, if we consider the case where a signal with a conduction phase angle of 0.5π is transmitted from base unit 1 as a dimming signal, the 6th
As shown in the figure, the microcomputer 21 in the terminal 4b inputs the above dimming signal and calculates the case for full conduction, and also inputs a value corresponding to the half cycle time of the AC voltage from the latch circuit 23 to control the dimming. Multiply the signal by the half cycle time,
A control output is output at a time according to the value of the product. Therefore, if the power supply frequency is 50Hz, the half cycle time is 10msec, so 10msec x 0.5
= 5msec, and in the case of 60Hz, the half cycle time is 8.33msec, so 8.33msec x 0.5 =
4.16msec, and as shown in Figure 5, in the case of 50Hz, 5msec after the zero phase of the power supply, and 60msec after the zero phase of the power supply.
At Hz, after 4.16 msec, a conduction phase angle output with each firing phase of 0.5π is obtained, and the dimming percentage remains constant regardless of the line frequency, eliminating the need for switching between 50Hz and 60Hz. It is. In other words, the conduction phase angle signal that controls the phase of the AC voltage is
Since it is formed by the product of the dimming signal indicating the proportion to the total conduction and the half cycle time of the AC voltage supplied to the lighting load 5b, the power frequency is 50Hz.
The conduction phase angle corresponding to the dimming signal can be kept constant even when changing between 60Hz and 60Hz, and can be used with either power supply frequency.

Furthermore, the load is not limited to the lighting load 5b, but may be an air conditioner, a show case, or the like.

[Effects of the Invention] According to the present invention, by the product of the signal indicating the proportion to the total conduction based on the control level signal received from the base unit for each terminal and the half cycle time of the AC voltage supplied to the load, By configuring the configuration to form a conduction phase angle signal, it is possible to generate any control level signal and this arbitrary load or terminal device even if any load or terminal device among multiple loads or terminal devices is used at different power supply frequencies. Since the relationship between the conduction phase angle corresponding to the control level signal can always be automatically kept constant, even if there are loads or terminals connected to power supplies with different frequencies, the connection from the main unit can be made using a common transmission line. , it is possible to remotely control the common conduction phase angle in a so-called multiplex manner for the terminal devices of the base device individually. For example, even if one of the terminals is powered by in-house power generation with a frequency different from that of the other power sources, the signal sent from the base unit will not be sent to the other terminals. Since the appropriate conduction phase angle can be controlled using the same type of signal as the control level signal, the signal does not become complicated and signal processing within the base unit can be easily performed.

In other words, there is no need to create multiple types of control level signals from the base unit for 60Hz and 50Hz, and there is no need to increase the number of signals unnecessarily. Processing does not become complicated.

Furthermore, since the conduction phase angle of the terminal device is determined based on the digital transmission signal, accurate control can be performed.

Furthermore, since the digital transmission signal is transmitted from the base unit to the terminal unit, the terminal unit can be accurately controlled even if attenuation and noise occur due to the transmission line.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the load control system system, Fig. 2 is a transmission signal format thereof, Fig. 3 is a block diagram showing a conventional terminal device, and Fig. 4 is an embodiment of the transmission control device of the present invention. 5 is a diagram showing the 0.5π setting dimming output waveform in the case of 50Hz and 60Hz, FIG. 6 is an explanatory diagram showing the operation of an embodiment of the present invention, and FIG. 7 is the same as above. This is a time chart showing the operation. DESCRIPTION OF SYMBOLS 1... Base unit, 3b... Signal transmission line, 4b... Terminal, 5b... Load, 21... Microcomputer as a control circuit, 22... Input interface as control level signal input means, 24...
. . . Counter as time measurement means, 26 . . . Zero cross circuit as zero cross detection means, 27 . . . Switching circuit as phase control means.

Claims (1)

[Claims] 1. A transmission line; a base unit connected to the transmission line and transmitting a digital transmission signal including an address signal and a control level signal to the transmission line; and a base unit connected in parallel to the transmission line. The terminal device comprises a plurality of terminal devices, a plurality of loads respectively associated with the terminal devices and energized from an AC power supply, and a phase control means for supplying a position-controlled AC voltage to the loads. a zero-cross detection means; receiving a digital transmission signal transmitted from the base device to the transmission line, and inputting a control level signal when each terminal device matches its own address and the address of the transmission signal; a control level signal input means for inputting a control level signal; and a half cycle time of the AC power source is measured by starting time measurement based on the zero cross signal detected by the zero cross detection means and measuring the time until the next zero cross signal. and a control circuit that multiplies the control level signal by the half-cycle time to generate a conduction phase angle signal, and controls the phase control means using the conduction phase angle signal. A transmission control device characterized by: