KR920004989B1 - Light intensity control method - Google Patents

Abstract

The firing angle of power provided to a lighting unit is increased sequentially to prevent trip of a main breaker when the target lighting level is considerably larger than current room lighting level. A microprocessor transmits the firing angle control signal to a gate controller and the gate controller turns on thyristors according to the control signal. Then the power applied to a lighting source increases sequentially so that initial inrush current to the lighting source is prevented.

Description

Dimming Control Method

1 is a block diagram of the dimming control method of the present invention.

2 is a signal flow diagram of the present invention.

* Explanation of symbols for main parts of the drawings

1: Dimming control signal input unit 2: Zero crossing detection unit

3: microprocessor 4: memory

5: gate control unit 6: dimming power supply unit

CH: Choke Coil

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to lighting control, and more particularly, to a dimming control method capable of preventing excessive inrush current from being applied to a load due to a sudden increase in dimming level at power-on.

In general lighting system, much more current than the rated current flows to the load when power on or dimming level rises rapidly, and the control element and protection circuit breaker trips or breaks the main power supply. It is necessary to reduce or use a higher rated protection device than necessary, which increases the cost of the dimmer and hassle for the user to take great care in controlling the dimming.

The present invention has been devised a control method that can increase the vacancy level step by step when a sharp increase in the dimming level is required to solve this problem will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram of the dimming control method of the present invention, as shown therein, a dimming control signal input unit 1 for inputting a dimming control signal according to a user's setting, and zero crossing detection accordingly. A zero crossing detection unit 2 for outputting a signal and a predetermined time period during which zero crossing is performed from the zero crossing detection unit 2 are scanned, and a signal according to the dimming level setting of a user is inputted from the dimming control signal input unit 2 A microprocessor 3 for outputting a dimming control signal corresponding thereto, a memory 4 for storing data corresponding to a dimming level and outputting the data to the microprocessor 3, and input from the microprocessor 3. In response to the dimming control signal, a gate controller 5 for outputting a gate on pulse, the gate controller 5, and a gate on pulse from the gate controller 5 It consists of a dimming power supply unit 6 for supplying power to the load by turning on the built-in thyristors at the time point, where the reference numeral 'CH' is a choke coil used as an inrush current suppression and high frequency noise attenuation element. Hereinafter, the present invention will be described in detail with reference to the block diagram of the present invention and FIG. 2 showing the signal flow of the present invention.

The microprocessor 3 scans the dimming control signal input unit 1 while continuously scanning the zero crossing point detected by the zero crossing detecting unit 2, and the dimming control signal set by the user is controlled by the dimming control signal input unit ( At the moment it is input to 1), the microprocessor 3 calculates the dimming control signal accordingly.

'이었으므로 목표레벨(50)에서 현재 조광레벨(

)을 뺀 결과가 50으로서 이는 '

'보다 큰 값으로 판정됨에 따라 현재 조광레벨(

)로부터 조광레벨을 순차적으로 증가시켜 목표레벨(50)에 도달되게 한다.For example, when the user sets the pore level to 50, which is an intermediate level in the initial state of power-on, the microprocessor 3 calculates the dimming control signal accordingly.

", So the target dimming level (50)

) Is 50, which means "

As determined by a value greater than 'the current dimming level (

), The dimming level is sequentially increased to reach the target level 50.

)에 임으로 설정시킨 값(예 : 5)을 출력한 후, 이를 20번 반복하여 현재의 조광레벨이 목표레벨(50)이 되면 그 목표레벨값(50)을 계속적으로 출력하게 된다.That is, the current orphan level (

), And then outputs the target level value 50 continuously, if the current dimming level reaches the target level 50 by repeating 20 times.

However, when the target level set by the user is found to be smaller than the current dimming level, the target level is output as it is without performing the sequential increase operation.

On the other hand, the gate control unit 5 supplies a current to the gate of the thyristors built in the dimming power supply unit 6 at the time when the control signal is input from the microprocessor 5 to turn it on, than the current pore level When the target level is high, the gate controller 5 gradually increases the conduction time of the thyristor under the control of the microprocessor 5, that is, gradually increases the conduction angle so that the power supplied to the load is gradually increased. .

As described in detail above, the present invention sequentially increases the conduction angle of the power supplied to the load to reach the target value at the time of initial driving, restoration, or when the target dimming level is set higher than the current dimming level. It is possible to prevent the frequent trip of the trip and the operation of the main breaker in advance to operate the system in a stable state.

Claims (1)

If the target dimming level is greater than the current dimming level, the microprocessor 3 outputs a control signal such that the power supplied to the load from the dimming power supply unit 6 gradually increases to reach the target dimming level through the gate controller 5. Dimming control method characterized in that.

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