JPS6321920Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a dimming device for fluorescent lamps installed for illuminating the interior of a show case. The purpose is to reduce the refrigeration load.

Previously, all the fluorescent lights used to illuminate the inside of show cases were always on throughout the opening hours of supermarkets, etc., to maintain the effect of displaying products. On the other hand, if all lights are on all the time, the internal refrigeration load will increase due to the heat load from the fluorescent lamps, leading to an increase in the power consumption of the compressor. Therefore, the inventor of this invention tried to dim the fluorescent light by 60%. If the light is dimmed all the time, the heat load from the fluorescent lights will be reduced and the power consumption of the compressor and fluorescent lights can be reduced, but if the light is dimmed when there are many customers, the freshness of the food will deteriorate. This will impair the effect of displaying the product, such as the appearance of the product.

The present invention was developed in view of these drawbacks, and one embodiment thereof will be described below with reference to the drawings. 1st
The figure shows an independent dimming delay timer circuit 1 and a dimming circuit 2 according to the present invention. In the delay timer circuit 1, 3 is a diode bridge circuit connected between the power supply terminal _T1 and the power supply terminal _T2 via a first resistor _R1 . C ₁ is a smoothing capacitor connected between the bus 4 connected to the rectifier circuit 3 and the terminal 5. Smoothing capacitor
A constant voltage circuit consisting of a series circuit of a second resistor R ₂ , first and second diodes D ₁ and D ₂ , and third and fourth resistors R ₃ and R ₄ is connected in parallel with C _1. ing. 6
is a timer element whose first input terminal 6a is connected to the bus bar ₄ via the second capacitor C2,
It is also connected to the connection point 7 between the second resistor R ₂ and the first diode D ₁ via the fifth resistor R ₅ .
The second input terminal 6b is connected to the connection point between the third resistor _R3 and the fourth resistor _R4 . Furthermore, a smoothing capacitor _C3 is connected between the connection point 7 and the bus bar 4.

Further, the timer element 6 is connected to the bus bar 4 through a wiring 6a and a wiring 6ro, and is further connected to a connection point 7 through a wiring 6c and a wiring 6d, and is supplied with power. The output of the timer element 6 is connected to the bus bar 4 via a sixth resistor _R6 and a seventh resistor _R7 , and the third
It is again connected to the timer element 6 via the diode D ₃ and the eighth resistor R ₈ . Q ₁ is the first NPN
type transistor (hereinafter referred to as the first Tr), 8'
is the excitation winding of the electromagnetic switch 8, the base of the first TrQ ₁ is connected to the connection point of the sixth resistor R ₆ and the seventh resistor R ₇ , and the collector is connected to one end of the excitation winding 8'. The emitter is connected to the bus 4.
Further, the other end of the excitation winding 8' is connected to the terminal 5. Note that a fourth diode _D4 whose forward direction is in the direction of the terminal 5 is connected in parallel with the excitation winding 8'.
2 is a dimming circuit. A bus P' is connected to the terminal P, and a bus L' is connected to the terminal L. Bus line
Between P' and bus line L' are a ninth resistor R ₉ , a tenth resistor R ₁₀ , an eleventh resistor R ₁₁ , and a first variable resistor.
A series circuit of R ₁ ′ and the fourth capacitor C ₄ is connected, and a series circuit of the 10th and 11th resistors R ₁₀ and R ₁₁ and the first variable resistor R ₁ ′ is connected in parallel. A normally closed contact 8a of the electromagnetic switch 8 is connected in parallel with the second variable resistor R _{2 '} .
Note that when the normally closed contact 8a is open, the charging time of the fourth capacitor _C4 is determined by the first and second variable resistors _R1 ',
The dimming is determined by the set value of R ₂ ', and the dimming circuit 2 is set to a dimming state in which the illuminance of the fluorescent lamp is reduced to, for example, 60% of the full lighting level within a range that does not cause flickering in the fluorescent lamp, which will be described later. On the other hand, when the normally closed contact 8a is closed, the 10th and 11th resistors R ₁₀ and R ₁₁ and the first,
The second variable resistors R ₁ ′ and R ₂ ′ are short-circuited, and the charging time of the fourth capacitor is short, and the dimming circuit 2 is in a fully lit state, and the fluorescent lamp, which will be described later, is fully lit. 9 is a trigger element, and 10 is a bidirectional three-terminal thyristor (hereinafter referred to as TRIAT). One end of the trigger element 9 is connected to the midpoint between the first variable resistor R ₁ ' and the fourth capacitor C ₄ , and the other end is connected to the gate of the triac 10 . Both anodes of the triax 10 are connected to the bus line R' and the bus line L', and a twelfth resistor _R12 and a thirteenth resistor are connected in parallel to the triax 10 to supply a current to compensate for the cut waveform generated during dimming.
parallel circuit with resistor R ₁₃ and fifth capacitor C ₅
A parallel circuit with is connected.

FIG. 2 shows a fluorescent lamp control circuit in which the dimming delay timer circuit 1 and the dimming circuit 2 of FIG. 1 are connected.

Reference numeral 11 denotes a 24-hour timer device that controls the period of time during which electricity is supplied to the dimming delay timer circuit 1, and its timer motor 11M is connected to an AC power source 12.

One end of the normally closed contact 11T is the first power switch 1
3a, and the other end is connected to the second power switch 13 via the power terminals T ₁ and T ₂ of the delay timer circuit 1.
connected to b. 14 is a fluorescent lamp lighting circuit. Reference numeral 15 designates a fluorescent lamp for illuminating the interior of the show case, in which a lighting tube 16 and a ballast 17 are connected in parallel. One end of the fluorescent lamp 15 is connected to the terminal P and also to the AC power supply 12 via the second power switch 13b, and the other end of the fluorescent lamp 15 is connected to the ballast 1.
It is connected to the secondary winding of 7.

Hereinafter, the operations of the delay timer circuit 1 and dimming circuit 2 shown in FIG. 1 and the fluorescent lamp control circuit shown in FIG. 2 will be explained based on the time characteristic diagram of the internal fluorescent lamp shown in FIG. 3.

1st and 2nd on 19th when supermarkets etc. open.
The power switches 13a and 13b are simultaneously closed manually, the fluorescent lamp 15 is energized via the dimming circuit 2, and the normally closed contact 11 of the timer device 11 is turned on.
Power is supplied to the power terminals T ₁ and T ₂ through T, and the delay timer circuit 1 is energized from the power terminals T ₁ and T ₂ through the rectifier circuit 3, and the timer element 6 starts counting by the energization. do. At this time, since the timer element 6 is not outputting, the first Tr (Q ₁ )
remains in the OFF state, the excitation winding 8' of the electromagnetic switch 8 is not energized, the normally closed contact 8a remains closed, and the charging time of the fourth capacitor _C4 is short, and the triac 10 is in the ON state and dims. The circuit 2 is maintained in a fully lit state, and the fluorescent lamp 15 is not dimmed, but is reliably lit, and is fully lit for a predetermined period of time. When a predetermined period of time, for example, 20 minutes has passed since the opening of the store 19, the count of the timer element 6 advances and the timer element 6 outputs an output. The first Tr (Q ₁ ) is activated by the output of the timer element 6.
is turned on, the excitation winding 8' of the electromagnetic switch 8 is energized, and the normally open contact 8a is opened, and the fourth capacitor C ₄
are the 9th, 10th, 11th resistors R ₉ , R ₁₀ , R ₁₁ and the first
_The trigger element ₉
The operation interval becomes longer, the phase of the current flowing from the AC power supply to the fluorescent lamp 15 is controlled by the triax 10, the dimmer circuit 2 enters a dimmed lighting state, and the fluorescent lamp 15 shifts from full lighting to dimmed lighting. At this point, Figure 3 1
It is 9ro. Thereafter, the timer element 6 continues to output, and dimmed lighting continues.

After a predetermined period of time has elapsed, the timer motor 11M of the timer device 11 is activated at a preset time point 19C.
Due to this operation, the normally open contact 11T is opened. Therefore, the delay timer circuit 1 is de-energized and the timer element 6 is similarly de-energized and reset, and at the same time the output becomes zero. Due to the zero output of the timer element 6, the first Tr (Q ₁ ) is turned off, and the excitation winding 8' of the electromagnetic switch 8 is de-energized, and the normally closed contact 8a is turned off.
When the light control circuit 2 is closed, the light control circuit 2 becomes fully lit. Therefore,
The triax 10 remains on and the fluorescent lamp 15 changes from dimmed lighting to full lighting. All of the fluorescent lamps 15 are turned on continuously during the busy time period 192 for customers.

After time has elapsed, the timer motor 11 of the timer device 11 is activated at a preset time point 19H.
The normally closed contact 11T is closed by the operation of M, the delay timer circuit 1 is energized, and at the same time, the timer element 6 is energized and starts counting. When a predetermined period of time has elapsed from the start of counting, the timer element 6 counts up and outputs an output. Therefore the first transistor
Q ₁ is turned ON, the excitation winding 8' of the electromagnetic switch 8 is energized, the normally closed contact 8a is opened, and the dimming circuit 2 is brought into a dimming state again, and the fluorescent lamp 15 is switched to dimming lighting. This point is at step 19 in FIG. From now on, timer element 6
continues to output, and the dimmed lighting of the fluorescent lamp 15 continues. After time has elapsed, at the time of closing, the first and second power switches 13a, 1 are manually turned on.
3b is opened at the same time, the fluorescent lamp 15 is de-energized and turned off, and the normally closed contact 11T and the power terminal T ₁ ,
Power is no longer supplied to the delay timer circuit 1 via _T2 , and the timer element 6 is de-energized and reset. Therefore, since the power for the dimming delay timer circuit is supplied via the normally closed contact 11T of the timer device 11, the normally closed contact 11T of the timer device 11
By arbitrarily setting the opening and closing times of the fluorescent lamps 15, it is possible to turn on the fluorescent lamps 15 in full during opening hours when customers are busy, and to dim them at other times. Further, the fluorescent lamp 15 is turned on completely for a predetermined period of time from 19a when the store is opened by the dimming delay timer circuit 1, so that the fluorescent lamp 15 is surely turned on.

In the above embodiment, the fluorescent lamps 15 are set to be approximately in the middle of the store opening time during the busy time period 19 when customers turn on all of the fluorescent lights 15, but by changing the set time of the timer device 11, this time period can be adjusted, for example. It can be set arbitrarily before closing time, etc., and when multiple times 192 are crowded with customers occur during opening hours, the setting time of the timer device 11 can be increased to control whether the fluorescent lamps 15 are turned on completely or at a reduced intensity. can do. Note that the first and second power switches 13
A similar effect can be obtained by opening and closing a and 13b by setting a time in advance using another timer device.

As described above, the present invention provides a fluorescent lamp dimmer that uses a dimmer circuit including an electric valve to control the phase of the current flowing to a fluorescent lamp installed for interior lighting in a show case, which is independent of the dimmer circuit. a dimming delay timer circuit including a timer element that controls the dimming operation of the dimming circuit to be in a full lighting state for a predetermined period of time from the start of operation and to be in a dimmed lighting state after a predetermined time; Since the timer device is provided with a timer device that controls the time period during which the power is supplied to the delay timer circuit, the fluorescent lamps for illuminating the interior of the refrigerator can be turned on reliably, and flickering of the fluorescent lamps can be prevented. Further, since the dimmer circuit and the dimmer delay timer circuit are each independent, a timer device that controls the energization time period can be connected to the dimmer delay timer circuit independently of the dimmer circuit. As a result, by controlling the energization/de-energization timer device to the delay timer circuit, the full lighting time and dimming lighting time of the fluorescent lamps can be adjusted according to the customer's busy time period, which changes depending on the season, etc., to display products. It can be set freely without sacrificing the effect, and the fluorescent lamp can be automatically switched between full lighting and dimmed lighting. Furthermore, by dimming the fluorescent lamps, the refrigeration load inside the refrigerator can be reduced, and the power consumption of the fluorescent lamps can also be reduced.

[Brief explanation of the drawing]

FIG. 1 is a diagram of a dimming delay timer circuit and a dimming circuit according to the present invention, FIG. 2 is a control circuit diagram of a fluorescent lamp, and FIG. 3 is a time characteristic diagram of an internal fluorescent lamp. 1...Delay timer circuit, 2...Dimmer circuit, 6
...Timer element, Q ₁ ...First NPN transistor, 8 ... Electromagnetic switch, R ₁ ′, R ₂ ′ ... Variable resistor, 9 ... Trigger element, 10 ... Triack,
11... Timer device, 12... AC power supply, 14
...Fluorescent lamp lighting circuit.

Claims (1)

[Scope of utility model registration request] In a fluorescent lamp dimmer device that uses a dimmer circuit including an electric valve to control the phase of the current flowing to a fluorescent lamp installed for lighting the interior of a show case, the dimmer is wired independently from the dimmer circuit and the dimmer is The dimming operation of the optical circuit is kept fully lit for a predetermined time from the start of operation,
A show case further comprising: a dimming delay timer circuit including a timer element that controls the dimmed lighting state after a predetermined period of time; and a timer device controlling a time period during which electricity is supplied to the dimming delay timer circuit. Fluorescent light dimmer.