JPH02270298A - Lighting apparatus for fluorescent lamp - Google Patents

Abstract

PURPOSE:To obtain a highly reliable lighting apparatus for a fluorescent lamp with compact size and at low cost by using a timer IC for an oscillation circuit and carrying out oscillation and modulation of oscillation frequency by a semiconductor switching device. CONSTITUTION:A timer IC 22 which oscillates when d.c, voltage obtained by rectifying lowered commercial a.c. voltage is applied to the timer through an input switching device Tr1 and lights a fluorescent lamp with high frequency and an oscilation circuit 20 having a frequency modulation switching device Tr2 to switch the frequency of the timer IC 22 in a plurality of stages are installed. Every time when a man touches to a touch switch 10, one clock pulse is generated by a signal converting circuit 12, and every time of input of the clock pulse from the signal converting circuit 12, signals are sent to a plurality of output terminals in a prescribed order by a sequence lighting control circuit 21 and turning on-off control of a frequency modulation switching device of the timer IC and the input switching device of the oscillation circuit is carried out in a prescribed order. By this system, low cost and compact size are achieve and error operation is lowered.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a separately excited type fluorescent lamp lighting device that lights a fluorescent lamp using a high frequency inverter. The present invention relates to a fluorescent lamp lighting device having a step-by-step dimming function.

[Conventional technology]

Fluorescent lamp lighting devices using a high-frequency inverter lighting method, which modulates the commercial frequency to a high frequency of several 10 KH2 to light the fluorescent lamp at high frequency, generally use a pull switch to change the lighting state of the fluorescent lamp in a predetermined order. However, in recent years, touch switches, which can be operated with a light touch of the finger and can switch on and off of fluorescent lamps or dim the brightness in a predetermined order, have superior operation intervals and are suitable for lighting equipment. It is popular because it increases the product value.

Fluorescent lamp lighting devices using a high-frequency inverter lighting method, in which the lighting state of the fluorescent lamp is switched using the touch switch mentioned above, are equipped with a self-exciting oscillation circuit, and a specific example thereof is shown in Figure 2. explain. In the same figure (1
) is a commercial AC power supply, (2) is a noise filter circuit, (3
) is a full-wave rectifier circuit, and (4) is a self-excited oscillation circuit connected to the full-wave rectifier circuit (3) via the first relay contact (7), which is an input switch. Ingredients,
A fluorescent lamp (6) is connected to the secondary side of this. When the DC voltage obtained by full-wave rectification of the commercial AC power supply (1) by the full-wave rectifier circuit (3) is applied to the oscillation circuit (4) via the first relay contact (7), the oscillation circuit (4) oscillates. When the lamp operates, a high frequency voltage is induced on the secondary side of the oscillation transformer (5), and the fluorescent lamp (6) is determined by the impedance of the current limiting means (8) connected to the two stools I of the oscillation transformer (5). High frequency lighting depending on the brightness of the current. The current limiting means (8) includes, for example, a first capacitor C1 and a normally closed second relay contact (9).
), the second capacitor C2 is connected in parallel through the second capacitor C2.
When the relay contact (9) is on, the fluorescent lamp (6) lights up at 100% of the rated brightness determined by the parallel capacitance of the first and second capacitors C1 and C2, and the second relay contact (9)
) is off, the fluorescent lamp (6) is connected to the first capacitor C.
The light is dimmed to a lower brightness determined by the capacity of only 1.

On/off control of the first and second relay contacts (7) and (9) is performed by a sequence lighting control circuit (11) using the following touch switch (10). In the sequence lighting control circuit (11), (12) is a touch switch (1
This is a signal exchange circuit that extracts stable clock pulses from the alternating current signal of the human body touching the touch switch (10), and orders one clock pulse to the touch switch (10) every month when the finger of the human body is eroded. (13) is a plurality of output terminals Q O, , Q each time one clock pulse is input from the signal conversion circuit (12).
The Ricade count IC (14) outputs a voltage high level control signal sequentially every 1 s... is a commercial AC power supply (
The sequence lighting control circuit (11) is operated by the IC DC power supply circuit that steps down and rectifies the voltage in step 1).

The four first to fourth output terminals Q o = Q 3 are used in the Recade Count IC (13), and the first output terminal QO, which initially outputs a voltage high level signal, is connected to the first output terminal QO through a transistor (15). 1 relay (16) is connected, the second second output terminal Q1 is an open terminal, and the second relay (17) is connected to the third output terminal Q2 to which the third high level signal is output. 18) is connected, 4
The fourth output terminal Q3 is connected to the ricade count IC (13
) is connected to the reset terminal R of the When a high level voltage reset terminal is input to the reset terminal R, the recade counter IC (13) is reset to an initial state in which the first output terminal Qo becomes high level. 1st relay (16
) opens and closes the first relay contact (7) and the second relay (18
) opens and closes the second relay contact (9).

When the υ gate count rc (13) is in the initial state, the first
Transistor (1
5) is turned on, the first relay (16) is activated and the first relay contact (7) is in the open state, so the oscillation circuit (4)
does not oscillate, and the fluorescent lamp (6) is off. If you touch the touch switch (10) with your finger in this state, the signal conversion circuit (12) will output the liquid count IC (13).
1 clock pulse is input to the input terminal IN of ), the voltage level of the first output terminal Qo changes from high level to low level, and a high level signal is instead outputted to the second output terminal Q1. Then, the transistor (15) turns off, the first relay (16) stops operating, the first relay contact (7) closes, the oscillation circuit (4) starts oscillating, and the fluorescent lamp (6) turns off. First and second capacitors CI, C! All lights are turned on at a brightness determined by the parallel capacitance.

Next, when you touch the touch switch (10) with one finger, a high level signal moves from the second output terminal Q of the Licade Count IC (13) to the third output terminal Q2, and the transistor (17) is activated. turns on, the second relay (18) operates, the second relay contact (9) opens, and the fluorescent lamp (6) switches to the first
Lighting is maintained at a lower brightness determined by the capacitance of the capacitor C1, and dimming is performed. In addition, the touch switch (
When you touch one finger on 10), the Licade Count IC (
13), a high level signal moves to the fourth output terminal Q, and the Licade count IC is reset to the initial state, thereby causing the first output terminal Q.

becomes high level, the first relay (16) operates, the first relay contact (7) opens, the oscillation circuit (4) stops oscillating, and the fluorescent lamp (6) turns off. From then on, every time you touch the touch switch (10) with your finger, the fluorescent lamp (6) will turn on.
The lighting states of full-light lighting, one-step dimming lighting, and lights-out are repeatedly performed in the same order.

[Problem to be solved by the invention]

By the way, the touch switch used to switch and control the lighting state of the fluorescent lamp as described above has an excellent switch operation feel and improves the product image of the lighting equipment, but the oscillation that causes the fluorescent lamp to turn on at high frequency A large transformer with high capacity is required, and a switch circuit that combines a relay contact to oscillate the oscillation circuit, a relay contact to switch and dim the lamp current of a fluorescent lamp, and a relay to drive it. The presence of parts increases the size of the lighting device as a whole, leading to an increase in cost. Furthermore, the relay contacts that switch the flashing and dimming of the fluorescent lamps are at risk of malfunction due to contact failure, resulting in a lack of reliability.

The present invention has been made in view of such problems, and an object of the present invention is to provide a fluorescent lamp lighting device in which a fluorescent lamp is lit at a high frequency using only small parts, mainly semiconductor parts, and the lighting state can be changed by operating a touch switch. With the goal.

[Means to solve the problem]

In order to achieve the above object, the present invention has multiple oscillation frequencies for a timer IC1 and a timer IC that oscillates when a DC voltage obtained by stepping down and rectifying a commercial AC voltage is applied via an input switching element to light a fluorescent lamp at high frequency. The separately excited oscillation circuit has an oscillation frequency modulation switching element that switches in stages, and the
A signal conversion circuit that generates clock pulses, and outputs each input clock pulse from the signal conversion circuit to a plurality of output terminals in a predetermined order, and connects the input switching element of the oscillation circuit and the oscillation frequency modulation switching element of the timer IC. Licade count I that performs on/off control in a predetermined order
The present invention is characterized in that it is configured with a sequence lighting control circuit having C.

In addition, as a safety measure when there is no load, such as when a fluorescent lamp is removed from its socket, the lighting device is provided with no-load detection means for detecting no-load conditions based on the presence or absence of lamp current flowing through the fluorescent lamp, and no-load detection means. A no-load switch circuit that operates when detecting a no-load condition and outputs a reset signal to the Licade Count IC, resetting the Licade Count IC to an initial state that turns off the input switching element of the oscillation circuit. It is desirable to include a time oscillation stop circuit.

[Effect]

The separately excited oscillation circuit equipped with a timer IC and the sequence lighting control circuit operated by a touch switch are both small, low-cost circuits made mainly of semiconductor components.
Further, by switching the lighting state of the fluorescent lamp using a semiconductor switching element, malfunctions are reduced.

Furthermore, by resetting the cascade count IC during no load, the oscillation of the oscillation circuit is stopped, and damage to circuit elements due to abnormal oscillation is prevented, thereby preventing electric shock accidents.

〔Example〕

Hereinafter, an embodiment will be described based on the specific circuit diagram shown in FIG.

Figure 1 shows a lighting device that uses a high-frequency inverter to light a fluorescent lamp (6) in three stages: full lighting, dimmed lighting with one step lower brightness, and off. Identical or equivalent parts are given the same reference numerals to avoid duplication of explanation. In FIG. 1, (20) is a separately excited oscillation circuit, (21) is a sequence lighting control circuit equipped with a touch switch (10), a signal conversion circuit (12), and a Licade count IC (13). Both of these are, for example, 1 of the IC DC power supply circuit (14) that steps down and rectifies commercial AC.
It operates with a DC voltage E of 2V.

The oscillation circuit (20) receives the DC voltage E from the DC power supply circuit (14) through an input switching element such as the first transistor Tr.
A timer IC (22) that oscillates and outputs a rectangular wave when applied via the timer IC (22), and a MOS-PBT that performs a switching operation that repeatedly turns on and off in response to the square wave signal of the timer IC (22). It has an oscillation transistor (23), and the switching operation of the oscillation transistor (23) causes one oscillation transformer to oscillate, and the fluorescent lamp (6) is current-limited by the primary winding N1 of the current transformer T2, which also serves as a parasitic switch, and lights up at high frequency. do. Timer IC (22
) has built-in, for example, two 11th and second oscillation resistors R1s and R2 for oscillation frequency modulation, and these two first and second oscillation resistors R1 and R2 are connected in parallel via an oscillation frequency modulation switching element, for example, a second transistor Tr2. Connected. Second
Timer I C when transistor T r 2 is off
<22), the fluorescent lamp (6) oscillates at a frequency determined only by the resistance value of the second oscillation resistor R1, and at this time the fluorescent lamp (6) is rated at 10
Full light is on at 0% brightness, and the second transistor T r
2 is turned on, the first and second oscillation resistors R1 and R2 are connected in parallel to increase the oscillation frequency of the timer IC (22), and the lamp current of the fluorescent lamp (6) decreases accordingly. The brightness of (6) is reduced by one step and dimmed.

The basic circuits of the signal conversion circuit (12) and the Licade Count IC (13) in the sequence lighting control circuit (21) may be the same as conventional ones, and the difference is that the Licade Count IC (
13) The first to fourth output terminals Q1 to Q3 and the reset terminal R are connected to the outside as follows. The base of the third transistor Tr3 is connected to the first output terminal QO, and the DC voltage E is applied to the collector of the third transistor Tr3.The resistor R3 and capacitor C1 of the CR time constant circuit
Connect the midpoint of the Ricade Count IC.
Connect to reset terminal R of (13). The CR time constant circuit consisting of the resistor R3 and the capacitor C1 is used to stabilize the operation by resetting the Licade count IC (13) when the commercial AC power source (1) is turned on. The base of the first transistor Tr1 is connected to the second output terminal Q1, and the bases of the first transistor Tr1 and the second transistor Trg, and a light emitting diode LED for dimming display are connected to the third output terminal Q. . Then, the fourth output terminal Q3 is connected to the reset terminal R.

Further, in the above embodiment, the following no-load oscillation stop circuit (24) is additionally provided as a safety measure during no-load. That is, for example, the secondary winding N2 of the current transformer T2 that limits the lamp current of the fluorescent lamp (6) is used as a no-load detection means that detects no-load conditions based on the presence or absence of lamp current, and the secondary winding N2 is If the third transistor Tr3 is turned on by the voltage induced by the flowing current, the relay count IC (
13) is reset, and the oscillation circuit (20) stops oscillating.

Next, the lighting operation of the fluorescent lamp according to the above embodiment will be explained.

When the commercial AC power supply (1) is turned on, the DC layer # circuit (1)
4), the DC voltage E is applied to the first transistor T r 1 and the sequence lighting control circuit (21). At this time, since the first transistor T r 1 is in the off state, the timer IC (22) does not oscillate, and the relay count I
C(13) becomes operational, and the DC voltage E
When the capacitor c1 is charged via the resistor R3 of the CR time constant circuit, and the charging voltage reaches a predetermined high level and is input to the reset terminal R of the ricade count IC (13), the ricade count I C(13) is reset, a voltage NO1 level signal is output to the first output terminal QO, and the third transistor T r 3 is turned on. Then, the capacitor C1 is turned off by the third transistor 7r6, and the voltage at the reset terminal R becomes zero level, so that the initial state of the recade count IC (13) is maintained.

When one finger touches the touch switch (lO), one clock pulse is output from the signal conversion circuit (12), and a high level signal is transferred to the second output terminal Q1 of the Licade count IC (13). As a result, the first transistor Tri is turned on, and a DC voltage E is applied to the timer IC (22).
is applied and the timer IC (22) starts oscillating.

At this time, since the second transistor Tr2 is in the off state, the timer IC (22) oscillates at a frequency determined by the first oscillation resistor R1, and the fluorescent lamp (6) is fully lit. At the same time, a voltage is induced in the secondary winding N2 of the counting transformer T2 by the lamp current, and this voltage causes the third transistor T
r3 remains on and the ricade count I C (13
) is maintained at a voltage zero level to prevent the recade count IC (13) from being reset inadvertently.

Next, when one finger touches the touch switch (10), a voltage high level signal moves to the third output terminal Q2 of the ricade count IC (13), and the first transistor T r
1 remains on, the second transistor T r 2 turns on, and the second oscillation resistor R is connected in parallel to the first oscillation resistor R1 of the timer IC (22), and the oscillation frequency of the timer IC (22) increases. As the train ascends, the brightness of the fluorescent lamp (6゛) decreases one step and remains lit. At this time, the light emitting diode L
The ED lights up to indicate that the fluorescent lamp (6) is in dimming mode.

Furthermore, when one finger touches the touch switch (10), the output moves to the fourth output terminal Q3 of the Ricade Count IC (13), the Ricade Count IC (13) is reset, and the first output terminal At the same time as the voltage of QO enters the initial state of high level, the voltage of the first and second output terminals Q1 and Q2 becomes low level, and the first and second transistors Tr
1 and Tr2 are turned off, the oscillation of the timer IC (22) is stopped, and the fluorescent lamp (6) is turned off. From then on, every time you touch the touch switch (10) with your finger, the fluorescent lamp (
6) Full lighting, dimming lighting, and turning off are repeated.

When the fluorescent lamp (6) is on and the fluorescent lamp (6)
) is removed from the socket for the purpose of lamp replacement due to the end of its life, etc., and there is no load. At this time, no lamp current flows through the current transformer T2, so no voltage is induced in the secondary winding N2, and the third transistor Tr3 is switched from on to off. As a result, the charge voltage of the capacitor cl of the CR time constant circuit is used to calculate the ricade count IC (
13) is reset and the first transistor T r 1
is turned off, the oscillation of the oscillation circuit (20) is stopped, and abnormal oscillation at no load is prevented.

In the above embodiment, the fluorescent lamp is dimmed in three stages including turning off, but it is also possible to dim the fluorescent lamp in four or more stages by increasing the number of output terminals used by the Licade Count IC. It is. Also, the counter I of the oscillation circuit
The oscillation frequency of C may be modulated by switching the connection state of a plurality of oscillation capacitors.

[Effects of the Invention] As described above, the present invention uses a timer IC in the oscillation circuit, and the oscillation and oscillation frequency modulation are performed by semiconductor switching elements, so large components can be omitted from the circuit components. , a compact, low-cost, and highly reliable fluorescent lamp lighting device can be realized.

In addition, with the addition of a no-load oscillation stop circuit that stops the oscillation circuit when there is no load, the oscillation circuit will malfunction when there is no load, such as when the fluorescent lamp is removed from the socket for lamp replacement when it is ready to light. Accidents such as damage to circuit elements due to oscillation or electric shock to the sokerato terminal can be prevented, and a safe and long-life fluorescent lamp lighting device can be provided.

[Brief explanation of drawings]

FIG. 1 is a lighting circuit diagram showing an embodiment of the present invention. FIG. 2 is a lighting circuit diagram showing a conventional fluorescent lamp lighting device. (1) - Commercial AC power supply, (6) - Fluorescent lamp, (1
0) --Touch switch, (12) --Signal conversion circuit, (13) --Ricade count IC. (20) --- Oscillation circuit, (21) --- Sequence lighting control circuit, (22)
-・Timer IC. Tr1--manual switching element, Tr2-m-oscillation frequency modulation switching element, (24)-no-load oscillation stop circuit, N2--no-load detection means. Figure 2

Claims (2)

[Claims] (1) A timer IC that oscillates and lights a fluorescent lamp at high frequency when a DC voltage obtained by stepping down and rectifying a commercial AC voltage is applied through an input switching element, and a timer IC
A separately excited oscillation circuit that has an oscillation frequency modulation switching element that switches the oscillation frequency in multiple stages, a signal conversion circuit that generates one clock pulse every time a human body touches the touch switch, and a clock pulse from the signal conversion circuit. Sequence lighting with a recade count IC that outputs each input to a plurality of output terminals in a predetermined order and controls on/off of the input switching element of the oscillation circuit and the oscillation frequency modulation switching element of the timer IC in a predetermined order. A fluorescent lamp lighting device comprising a control circuit. (2) No-load detection means detects the no-load state based on the presence or absence of lamp current flowing through the fluorescent lamp, and when the no-load detection means detects the no-load state, the no-load detection means operates and outputs a reset signal to the Licade count IC. 2. The fluorescent lamp lighting device according to claim 1, further comprising a no-load oscillation stop circuit having a switch circuit for resetting the Licade count IC to an initial state in which an input switching element of the oscillation circuit is turned off.