JPS6217998A - Lamp test 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 to Which the Invention Pertains] The present invention relates to a lamp lighting method during a lamp test on a control console or display panel of a control system, and particularly relates to a method for lighting a lamp at the time of a lamp test on a control console or display panel of a control system. The current capacity is 17
This has been reduced to 2.

[Prior art and its problems]

At a control console or display panel of a control system, a lamp test is performed in which the lamp is actually turned on to check whether the lamp is disconnected. In conventional lamp test methods, it is common to turn on all lamps during a lamp test.

In addition, in such systems, power supplies are duplicated in order to deal with power supply abnormalities, but even if one of the power supplies becomes abnormal when duplicating the power supplies, the lamp test is performed with all points lit. Therefore, the output current capacity of each power supply is required for lighting all lamps. On the other hand, there are many systems in which the number of lamps lit during normal times (other than during lamp tests) is less than 1/2 of the total number of lamps, and in this case, the output current capacity of the power supply is sufficient to be 2 of the conventional output current capacity.

From the above, conventionally, the power supply has been required to have the maximum output for lighting all the lamps only for the lamp test, which has resulted in the disadvantage that the power supply has become larger and the cost has increased.

[Purpose of the invention]

In view of the above, an object of the present invention is to provide a lamp test method that reduces the output current capacity of each of the redundant power supplies to 1/2 of the conventional one, thereby reducing the size and cost.

[Key points of the invention]

The present invention employs a redundant power supply with an output current balance control method that shares 1/2 of the load current (lamp drive current), and that the number of lamps lit during normal (other than lamp tests) is less than the total number of lamps. The system configuration is based on two conditions: 1/2 or less, and in such a system, when a power supply abnormality occurs, a signal (
A power supply abnormality signal) is output, and a processing section that receives this power supply abnormality signal performs processing to ensure that the maximum output current capacity of the power supply is not exceeded during a lamp test.

[Embodiments of the invention]

(First Embodiment) FIG. 1 is a block diagram of an embodiment of an apparatus for carrying out a lamp test method according to the present invention.
The power supply 1.3 indicates the processing section, 4 indicates the lamp drive section, 5 indicates the lamp section, 6 and 7 indicate the power supply abnormality signal, 8 indicates the lamp test signal, 9 indicates the lamp test lock signal, and 10 and 11 indicate the lamp drive current. ing. The lamp unit 5 has a plurality of lamps, and the power supply 1.2 is a dual power supply with an output power balance control method, and the lamp drive current l is applied to each lamp of the lamp unit 5.
O and 11 are supplied in a balanced manner so that the flow values in both chambers are equal. Since this is an output current balance control method, power supply 1.2 has an output current capacity equal to 1 of the total number of lamps.
/2 can be set to the required capacity to light up. Further, the power supply 1.2 is provided with means for detecting a power supply abnormality such as a power cut, and outputs a power supply abnormality signal 6.7 to the processing unit 3 when a power supply abnormality is detected. When the processing section 3 receives the lamp test signal 8, it normally outputs a signal to the lamp drive section 4 and lights up all the lamps of the lamp section 5.
If the power supply abnormality signals 6 and 7 are given, a lamp test lock signal 9 is output to inform the operator that the lamp test is prohibited or stopped, and the lamp test signal 8 is not accepted and the lamp test is not performed. As a result, even if the output current capacity of power supply 1.2 is the capacity required to light 1/2 of the total number of lamps using the output current balance method, the output current capacity is insufficient because lamp tests are not performed in the event of a power failure. There's nothing to do.

(Second Embodiment) FIG. 2 shows a block diagram of another embodiment of the apparatus for carrying out the lamp test method according to the present invention, and the same components as in FIG. 1 have the same reference numerals. It is shown in This second embodiment is different from the first embodiment shown in FIG. Instead of outputting signal 9 to the outside, it receives lamp test signal 8 and sends divided lighting command signal 12 to lamp drive section 4.
and that the lamp drive section 4 is configured to alternately light the lamp groups 5a and 5b when it receives the divided lighting command signal 2. With this configuration, even if one of the power supplies 1 and 2 experiences a power failure, a lamp test can be performed using the other power supply that has the output current capacity necessary to light 1/2 of the total number of lamps. I can do it.

(Third Embodiment) FIG. 3 shows a block diagram of another embodiment of the apparatus for carrying out the lamp test method according to the present invention, in which the same components as in FIG. M1 are designated by the same reference numerals. There is. This third embodiment differs from the embodiment shown in FIG. 1 in that the processing section 3 receives the lamp test signal 8 instead of outputting the lamp test lock signal 9 to the outside,
3 is output to the lamp drive unit 4, and the lamp drive unit 4 is provided with a duty control unit 14, and upon receiving the lamp drive current control signal 13, the lamp drive current is reduced by 1/2 (
The point is that the duty ratio is controlled to be 2 times). With this configuration, even if one of the power supplies 1 and 2 experiences a power failure, a lamp test can be performed using the other power supply that has the output current capacity necessary to light 1/2 of the total number of lamps. I can do it.

〔Effect of the invention〕

According to the present invention, by providing a power supply abnormality signal and processing during a lamp test, the output current capacity of the power supply can be reduced to the same level as the conventional lamp without hindering normal lamp lighting even when one system of the redundant power supply has an abnormality.
/2, and the power supply can be made smaller and lower in cost.

[Brief explanation of the drawing]

1, 2 and 3 show block diagrams of embodiments of apparatus for carrying out the lamp test method according to the invention. 1.2... Power supply, 3... Processing section, 4... Lamp drive section, 5... Lamp section, 6, 7... Power supply abnormality signal, 8... Lamp test signal. .

Claims (1)

[Claims] 1) Duplicate power supplies for lamp display, balance the output current from both power supplies, and supply current to each lamp so that the number of lamps normally lit is 1/2 or less of the total number of lamps lit. In such a device, each power supply is provided with means for detecting a power supply abnormality and outputting an abnormality signal, and a processing section that receives the abnormality signal from the means and controls a lamp lighting method during a lamp test. This lamp test method is characterized by: 2) In the lamp test method according to claim 1, the processing section includes means for notifying lamp test prohibition or stop upon receiving an abnormal signal, and means for prohibiting reception of the lamp test signal. The lamp test method is characterized by: 3) In the lamp test method according to claim 1, the processing section is configured to output a divided lighting command signal to the lamp drive section for alternately lighting two lamp groups in response to an abnormality signal. A lamp test method characterized by the following configuration. 4) In the lamp test method according to claim 1, the processing section is configured by means for receiving an abnormal signal and outputting a control signal for reducing the lamp drive current by half to the lamp drive section. A lamp test method characterized by: