JPS6252891A - Dimmer backup system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for enabling backup means in the case where the CPU in a dimming device with a built-in central processing unit (CPU) stops functioning.

[Technical front of invention]

Conventionally, this type of light control device does not use a digital transmission device for sending and receiving digital signals.

Therefore, the analog signal (analog voltage) from the fader (fader), which is arranged to set the dimming during the dimming operation, is transmitted in parallel to each unit rank of the dimming circuit by adjusting the energization phase of the thyristor. Because of this, in an emergency, the analog output of the Faegoo had to be sent directly to each unit, which was cumbersome, and there was also the problem that dimming control could not be performed smoothly.

Therefore, the present applicant has previously proposed digitalizing the signal transmission and reception between the dimming control console and the thyristor dimming circuit.

In other words, during dimming operation, in which the brightness is set moment by moment according to the situation, there are multiple faders that adjust the brightness of each light beam (unit rack), and an analog signal from each fader. An A/D converter that converts signals into digital signals, a CPU that handles signal exchange and control calculations, ROM (fixed memory), RAM (temporary memory), and stores data for each scene as needed. It is composed of a data diskette that reproduces the data according to the timing, and a transmission board circuit that sends and receives signals to the thyristor dimmer circuit, and transmits and receives signals between the dimmer control console and the thyristor dimmer circuit using a minimum of two signal lines. With this in mind, we are planning to digitize it in a time-sharing manner.

However, in this light control device with a built-in CPU, the CPU
In the event of a downtime, all functions had to stop.

(Object of the Invention) Here, the present invention overcomes the difficulties of the conventional example and
The purpose is to provide a backup system that can perform appropriate control when the CPU function stops using a built-in digital light control device.

(Summary of the Invention) In order to achieve the above object, the present invention provides an analog to
At least two connection lines that do not go through the system bus are connected via a 3-state buffer between the digital conversion board and the transmission board that sends and receives digital signals to and from the V Iristor dimming circuit, and in case of an emergency, the fader This is a dimming device backup method in which the transmission device that includes the transmission board directly reads the digitized signal.

(Embodiment of the Invention) A block diagram representing a circuit (V configuration) in an embodiment of the present invention is shown in FIG.

Under normal conditions, this circuit is the digital light control device proposed earlier by the applicant.

1 is an analog-to-digital conversion board, which receives analog signals from the faders that set the brightness of each lamp 9 through the multi-bleaching unit 11, organizes which fader the information is coming from, and sends it to instructions from the CPU. Therefore, specific information is extracted and sent to the analog-to-digital converter 12, and the digitized signal is converted into a 3-state buffer. (35 tat
e Buffer is a buffer that takes three states: H (high level), L (low level) in reactive mode, and high impedance in inactive mode. A 3-state buffer that introduces signals from inside to the inside? It is.

2 is a transmission board that sends information introduced via the system bus 7 to the thyristor dimming circuit 8 via a transmission device, and 24 and 25 are 3-state buffers that exchange signals with the system bus 7. It is.

3 CPU, 4 G, tRAM, 5
A ROM, 6 a data diskette containing information for dimming in a certain sequence according to a schedule and retrieved by a command from the CPU, 8 a thyristor dimming circuit that controls each lamp 9 according to data given to the receiving board circuit 81; Thyristor power supply 10 to dim
This is means for controlling the energization phase from the energization phase.

With such a system configuration, smooth dimming is achieved during normal times.

However, once the CPU 3 goes down, the analog signal from the fader has to be sent to the thyristor dimming circuit 8.

Therefore, the present invention provides 3-state buffers 15.16 and 22.23 on the A/D board 1 and transmission board 2, respectively.
These three-state buffers 15, 16, 22, and 23 are made active by switching emergency switches (not shown).

However, the information transmission lines from the 3-state buffer 16 to 23 and from the 3-state buffer 22 to 15 are connected.

In other words, a 3-state buffer 15 for data and address
, 16.22.23 shall be activated in case of emergency. 3-state buffer 13.14, 24.2 on system bus 7 side
5 is designed to be inactive in an emergency.

This series of operations is operated by an emergency switch that is activated upon detection of CPU stoppage.

By turning off the emergency switch in this manner, information for dimming can be transmitted without going through the system bus 7.

〔Effect of the invention〕

Thus, according to the present invention, in a system that includes a built-in CPU and configures an ideal dimming device by transmitting digital signals, even if a busy period occurs in which the CPU is down, the system bus can be switched to I! It has the necessary functions as a dimmer, enables backup in an emergency, and significantly improves the reliability of a dimmer with a built-in CPU.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the circuit configuration in one embodiment of the present invention. 1......Analog to digital conversion board 11...Multiplexer 12.
......Anolog-digital converter 13
．． 14...3 state buffer? 2......Transmission board 21...Transmission neck 22-25.
・・3 state buffer 3・・・・・・・・・・・・CPU 4・・・・・・・・・RAM 5・・・・・・・・・ROM 6・・......Data diskette 7...
・・・・・・・・・・System bus 8・・・・・・・・・・
...Thyristor dimming circuit 9...
・Lamp 10・・・・・・・・・Power supply.

Claims (1)

[Scope of Claims] 1. An analog to digital conversion board that converts the dimming analog signal from the fader into a digital signal, a CPU that manages control calculations, and a storage means that stores the initial values, procedures, and results of the calculations. , a transmission board equipped with a transmission device that sends and receives digital signals for dimming to and from the dimming circuit, a system bus that forms a path for digital signals between these, and a digital signal for dimming from the transmission board. In a system equipped with a dimming circuit that adjusts the brightness of the light source, when the CPU is not operating, the signal is sent to the transmission device via a multiplexer that selects one of the analog signals from multiple faders, and then an analog to digital converter. A dimmer backup method characterized by providing a path from the transmission device to the multiplexer and a path from the transmission device to the multiplexer separately from the system bus. 2. means for providing 3-state buffers for sending and receiving digital signals on the analog-to-digital board and the transmission board, respectively; and means for connecting the 3-state buffers for sending and receiving digital signals with a transmission line; A dimmer backup system according to claim 1, comprising: