JPH01273196A - Lamp flashing system - Google Patents

Abstract

PURPOSE:To reduce the variation of a current supplied from a power circuit, and to suppress its maximum current and to prevent disturbance to other signals by making pilot lamps different in flashing timing. CONSTITUTION:When a 1st LED starts flashing with a 1st signal and than a 2nd LED starts flashing later with a 2nd signal, they are driven to flash at the opposite flashing timing, i.e. so that the 2nd LED is turned off while the 1st LED lights and the 2nd LED lights while the 1st LED is turned off. When a 3rd LED starts flashing further later with a 3rd signal, this flashing timing is equal to that of the 1st LED and a 4th LED which starts flashing lastly flashes at the same timing as that of the 2nd LED. Consequently, the maximum current is reduced to half as compared with when all the LEDs are driven at the same timing, and the largest current variation is reduced to quarter.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is directed to improving a lamp blinking system for a control device or the like having a plurality of indicator lamps.

[Prior art] One control device with multiple control functions is equipped with a plurality of blinking display lamps corresponding to each of the functions, and one control device is equipped with a plurality of blinking display lamps, and one control device controls the power R voltage. With the supply of
In systems that display blinking display lamps of a plurality of terminal devices, a method is adopted in which a reference control signal is sent to the display lamps all at once to cause the display lamps to blink.

FIGS. 6(a) to 6(e) are timing charts showing an example of such blinking control used, for example, in a security system.

In the example shown in (H), LEDs are used as indicator lamps, and the fire indicator LED is activated in response to the human input of the fire alarm signal, the gas 1 indicator LED is activated in response to the gas alarm signal, and the gas alarm LED is activated in response to the input of the crime prevention delta alarm signal. The security LED blinks in response to the communication signal, and the communication LED blinks in response to the communication signal. In this case, if the current flowing through one LED indicator is Ia [A], the number of LEDs that blink will increase over time, and when all LEDs blink, qxla[A]
This current is intermittently supplied from a power supply circuit (not shown). The Japanese government shows a case where there are four display LEDs, but generally speaking, if there are n display LEDs, a current of nx[a[A:] will flow intermittently when all LEDs blink, and the power supply The current capacity of the circuit is required to be at least nXIa [A] in order to blink the LED, and the load on the power supply circuit becomes extremely heavy in terms of voltage stability.

FIG. 7 shows an example of use in a control system in which terminal devices 201 to 203, which operate by receiving power supply voltage from the main device 100, are connected by a signal line p. As shown in the timing chart in the figure, when data to start blinking the LEDs used as display lamps is transmitted from the base unit 100 to the terminals 201 to 203 as transmission data, each terminal Since the blinking operation starts all at once according to the reference control signal, the maximum value of the current supplied from the base unit 100 to each terminal unit 201 to 203 is nxta [A], and as in the above example, the power supply of the base unit 100 is The current capacity of the circuit is nxia [A
] is required. In addition, such a system has large current fluctuations, so its voltage stability is questioned. Furthermore, in the case of telephone systems, etc., a direct current voltage is often superimposed on the transmission line of the telephone signal and sent, and a large current is passed intermittently, causing Each terminal device 201~
The ground potential of 203 fluctuates, causing interference with the call signal.

[Problems to be Solved by the Invention] The present invention proposed to solve the above problems reduces the maximum current supplied from the power supply circuit by varying the blinking timing of a plurality of indicator lamps, and further reduces the current. The purpose of this invention is to reduce the fluctuation 1 so that it can be covered by a power supply circuit with a small current capacity, prevent interference with other signals, and provide a highly reliable lamp blinking system.

[Means for Solving the rR Problem] The present invention proposed to solve the above problems supplies a power supply voltage from a common power supply circuit to a plurality of display lamps so that each display lamp blinks. In the lamp blinking system, the blinking timing of the indicator lamp is varied according to a predetermined control pattern.

This invention can be implemented with various control patterns,
In this example, a common power supply circuit is provided in one control device, and the control pattern has different blinking timings depending on the order in which the blinking operations of the display lamps are started.

[Function] In the lamp blinking system of the present invention, when a plurality of lamps blink, the blinking timings are different, so fluctuations in the current supplied from the power supply circuit are alleviated, and furthermore, the supplied current is The required maximum value will be reduced.

Furthermore, according to the present invention proposed at the same time, when a supply current is superimposed on a call signal or the like, current fluctuations are alleviated, thereby reducing interference with the signal.

[Example] The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a timing chart explaining the first embodiment. In this example, an LED is used as the indicator,
1st LED to 4th signal according to human power of 1st signal to 4th signal
The LED performs a blinking operation, and the lighting period and the lighting period when blinking are the same.

First, the first LED starts blinking due to the first signal,
If the second LED starts blinking due to the second signal after a delay, the blinking timing is opposite to that of the first LED, that is, the first
During the period when the LED is on, the second LED is off and the first
During the period when the LED is off, the blinking drive is performed at the timing when the second LED is turned on. When the blinking operation of the third LED is started by the third signal after a further delay, the blinking timing in this case is the same as that of the first LED, and the fourth LED, which starts blinking last, blinks at the same timing as the second LED. It will be done.

When the display LEDs are driven with such blinking timing, the current supplied from the power supply circuit to all the LEDs is as shown in Figure 1 (e
), the current supplied to one LED is Ia-
[A], the maximum supply current is 21 a [A], and the maximum current fluctuation is Ia [A].

Therefore, the maximum current is reduced to 1/2 compared to when all LEDs are driven at the same timing, and the maximum current fluctuation is 1/2.
/4.

Generally, when there are N indicator lights, the maximum current is (N a) /2 if N is an even number, and ((N/2) + 1) Ia if N is an odd number. This means that the power supply capacity will be reduced to about half.

Furthermore, the maximum current fluctuation varies depending on the number of LEDs that have stopped blinking and the LEDs that are newly started blinking, but the maximum value is ((N/2) + 1) · 1a, which is compared to a normal lamp blinking system. It is possible to reduce it to approximately half.

FIG. 2 is a flowchart showing the operation of the above embodiment. When an LED blinking signal is manually input to the main unit (not shown), it is determined in step 101 whether it is an LED off signal, and if it is a blinking signal, a counter (not shown) is sent to the main unit (not shown). Therefore, if the input number of the signal is an odd number, it starts blinking with the reference pulse A of 103, while if it is an even number, it starts blinking with the reference pulse B of 104. Also, if the signal is an off signal with the input number 101, the corresponding LED is turned on. Lights out.

In this embodiment, the reference pulses A and B are pulses of duty 50 having opposite phases as shown in FIG. 3 to perform the blinking operation of the LED.

FIG. 4 is an explanatory diagram of the case where the lamp blinking system of this embodiment is applied to a specific circuit.

In this example, when a fire signal, a gas leak signal, a crime prevention signal, and a communication signal are manually input to the main unit M, the order in which the signals are input is determined by the main unit M and distributed into two blinking patterns, and the common power supply Vcc The LED display devices L1 to L4, which are supplied with power supply voltage from the power source, are configured to blink.

FIG. 5 is a timing chart illustrating a second embodiment of the present invention. In this embodiment, the operation is shown in an example in which the system is applied to a system having a configuration in which one base unit and a plurality of terminal units each having an address are connected, such as the system shown in FIG.

When blinking start data is transmitted from the base device (not shown) to the LEDs of all terminal devices (not shown) as transmission data, each terminal device is connected to a group of terminal devices having an even number of addresses according to each address. Terminal groups with odd addresses repeat the blinking operation so that when the LED in one group is on, the other one is off. Therefore, if the number of terminal devices is even, that is, N is an even number, When all LEDs are blinking, the supply current is always constant at (N/2) Ia [A], and when N is an odd number, the supply current is ((N/2)
) + 1) ・I a [A] and the current fluctuation is ia [A]
becomes. Therefore, compared to driving the LEDs of all terminals to blink at the same timing, the supply current can be reduced to about half, and current fluctuations can be reduced to almost zero, greatly reducing interference with call signals, etc. That will happen.

[Effects of the Invention] The lamp blinking system of the present invention lowers fluctuations in the current supplied from the power supply circuit by varying the blinking timing of a plurality of display lamps, and suppresses the maximum current to prevent interference with other signals. This makes it possible to provide a highly reliable lamp flashing system.

[Brief explanation of the drawing]

11th! I is a timing chart explaining the first embodiment of the present invention, FIG. 2 is a flowchart explaining its operation, FIG. 3 is an explanation diagram of its reference pulse, FIG. 4 is an explanatory diagram showing an example of its application, and FIG. 5 is a timing chart explaining the second embodiment, FIG. 6 is a timing chart of a conventional lamp blinking method, and FIG. 7 is a diagram showing an example of the configuration of a terminal system.
FIG. 8 is a timing chart showing the blinking operation. [Explanation of symbols]

Claims (3)

[Claims] (1) In a lamp blinking system in which power supply voltage is supplied from a common power supply circuit to multiple display lamps to cause each display lamp to blink, the blinking timing of the display lamps is controlled according to a predetermined control pattern. Different lamp flashing systems. (2) A claim in which the common power supply circuit is provided in one control device, and the control pattern is such that the blinking timing is different depending on the order in which the blinking operations of the indicator lamps are started. The lamp blinking system according to item 1. (3) The above-mentioned common power supply circuit is provided in one control base unit, the above-mentioned indicator lamp is provided in a plurality of terminal devices connected to the base unit, and the above-mentioned control pattern is set in advance in a group 2. The lamp blinking system according to claim 1, wherein the divided terminal devices are configured to have different blinking timings for each group.