KR900002179Y1 - Electronic circuit arrangements for discharge lamps - Google Patents

Abstract

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Description

Heterogeneous power electronic fluorescent ballast

1 is a circuit diagram of the present invention.

* Explanation of symbols for main parts of the drawings

2: current limiting part 4: oscillation part

7: power supply 21-25: current limiter

L ₄ : Choke Coil FL: Fluorescent Lamp

SW ₁ , SW ₂ : Changeover switch SW ₃ : Rotary switch

C ₁ -C ₃ , C ₁₁ -C ₁₅ : Thermistors D ₁ , D ₂ : Diodes

T ₁ : high frequency transformer

The present invention relates to an electronic fluorescent ballast for heterogeneous power supply (110V / 220V).

Since a general fluorescent lighting device is composed of a choke coil or a glow slider, it takes a long time to turn on the fluorescent lamp.

In particular, such a conventional fluorescent lamp lighting device uses a choke coil instantaneous peak value to turn on the fluorescent lamp, which leads to enormous power consumption at startup, and a considerable time until the discharge current becomes stable after startup (15 minutes to 30 minutes). This results in unnecessary power consumption.

In addition, the conventional fluorescent lamp lighting device turns on the fluorescent lamp at a low frequency (60Hz) operating voltage, which may cause vision and hearing impairment due to flicker and oscillation noise.

Recently, an electronic ballast using magnetic or magnetic oscillators has been proposed to solve such problems, namely, problems in fluorescent ballasts due to delayed lighting and elemental power.

However, these electronic ballasts have a function of instantaneous lighting as they are manufactured in a small size and light weight, but the circuit structure of the fluorescent lamp ballast is complicated, resulting in a rise in product prices.

Especially for single fluorescent lamp lighting ballast, 20W, 30W, 40W, .. If the fluorescent lamp of the lamp is designed to selectively light or the brightness of the fluorescent lamp is designed to be adjustable, the circuit configuration of the fluorescent ballast becomes more complicated.

The present invention is to solve the above problems, while being 110V / 220V combined, it is possible to use the dual-power dual-purpose electronics to enable low-cost manufacturing easy to adjust the brightness of the fluorescent lamp or the output of the fluorescent lamp (20W, 30W, 40W, ...) It is an object of the present invention to provide a fluorescent ballast.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 1, the AC input voltage using 110V / 220V is bridge rectified or doubled at the power supply unit 7 composed of the bridge rectifier FR, the capacitors C ₂ and C ₃ and the switching switch SW ₁ . Connect the voltage rectified and output to DC220V.

The DC200V output voltage of the power supply unit 7 is connected to the oscillation unit 4 including the switching transistors Q ₁ and Q ₂ , the high frequency transformer T ₁ , and the capacitor C ₅ .

The collector of the switching transistor Q ₁ and the emitter of the switching transistor Q ₂ are connected to the + output terminal and the-output terminal of the power supply unit 7, respectively, and the base and emitter of the switching transistors Q ₁ , Q _2, respectively. between, the collector of the emitter and the switching transistor (Q ₂₎ of each of the high-frequency transformer (T ₁₎ 2 primary coil (L ₂₎ and the tertiary coil connected to the (L _3), and the switching transistor (Q ₁₎ of The common coil is connected to the primary coil L ₁ of the high frequency transformer T ₁ .

Here, the secondary and tertiary coils L ₂ and L ₃ of the high frequency transformer T ₁ are wound in opposite directions.

The output end of the oscillator 4 has a choke coil L ₄ having a tap-change switch SW ₂ and a fluorescent lamp FL having a starting capacitor C ₄ in series, one end of which is The capacitor C ₁ connected to the output terminal and the current limiter 2 commonly connected to the diodes D ₁ and D ₂ are commonly connected.

The diodes D ₁ and D ₂ are connected to the + output terminal and the-output terminal of the power supply unit 7, respectively.

The current limiter 2 includes a plurality of current limiters 21-25 selected by the rotary switch SW ₃ , and each current limiter 21-25 has a resistor R ₁ -R _3, respectively. ) And the condenser (C ₁₁ -C ₁₅ ) and thermistor (TH ₁ -TH ₅ ) in parallel.

The capacitance value of the capacitors C _11- C _{15 in} each current limiter 21-25 constituting the current limiting unit 2 is designed to be C ₁₁ 〉 C ₁₂ 〉 C ₁₃ 〉 C ₁₄ 〉 C _15. do.

Referring to the operation and effects of the present invention configured as described above are as follows.

In FIG. 1, when the ballast of the present invention is applied to a 220V commercial voltage, interlocking switching switches SW ₁ and SW ₂ are positioned at respective terminals a.

Therefore, when the AC voltage of 220V is input, the AC input voltage is rectified and supplied to the oscillation unit 4 at the power supply unit 7 composed of the bridge rectifier FR and the capacitors C ₂ and C ₃ . a capacitor (C ₁₎ is at 0 voltage - so charged toward the voltage of one filament of the high-frequency transformer _{(T 1) (L 1)} 1 the secondary coil of the choke coil selected for the 220V (L ₄₎ and a fluorescent lamp (FL) A starting current path consisting of the other filament of the capacitor C ₄ and the fluorescent lamp FL and the capacitor C ₁ is formed.

At this time, since the current flows from the winding start point (denoted by 0) in the primary coil L ₁ of the high frequency transformer T ₁ in the oscillation unit 4, ₁ in the secondary and tertiary coils L ₂ and L ₃ . Since the switching transistor Q ₁ is turned on and the switching transistor Q ₂ is turned off because the current flows in the opposite direction to the current direction of the secondary coil L ₁ , the + of the power supply unit 7 through the switching transistor Q ₁ is positive. The current on the voltage side further charges the capacitor C ₁ through the primary coil L ₁ , the choke coil L ₄ , and the fluorescent lamp 9FL of the high frequency transformer T ₁ , and a part of the current limiting part ( 2) is recovered to the + voltage side through the diode D ₁ .

Here, the diode D ₂ forms a closed circuit when the capacitor C ₁ is charged.

Subsequently, in the remaining half cycle of the resonance period determined by the choke coil L ₄ and the capacitor C ₁ , the voltage charged in the capacitor C ₁ is in the order of the fluorescent lamp FL (in this case, several hundreds to several hundreds of ohms). preceding paragraph is the load) and a high-frequency transformer (T ₁ 1 primary coil (base, the tertiary winding of the switching transistor (Q _2), so flow to the L ₁₎ a) of the oscillation unit 4 via the choke coil (L ₄₎ (L ₃ The bias current induced by N) is supplied to turn on the switching transistor Q ₂ .

Therefore, the discharge path of the charge charged in the capacitor (C ₁ ) to the capacitor (C ₁ ), the fluorescent lamp (FL), the choke coil (L ₄ ), the primary coil (L ₁ ) and the switching transistor (Q ₂ ). It is formed by a closed circuit.

The brightness of the fluorescent lamp FL, which is turned on through the above process, may be adjusted by each current limiter 21-25 selected by the rotary switch SW ₃ in the current limiting unit 2. Furthermore, if the value of the current limiter 21-25 is properly adjusted, it is possible to flow a rated current suitable for the capacity of the fluorescent lamp FL (20W, 30W, 40W, ...). Fluorescent lamp lighting output can be made selectively.

In detail, when the switching transistor Q ₁ of the oscillator 4 is turned on, the capacitor C ₁ is the choke coil of the primary coil L ₁ of the switching transistor Q ₁ and the high frequency transformer T ₁ . Charged by the current of the + voltage terminal of the power supply unit 7 through (L ₄ ) and the fluorescent lamp (FL).

At this time, if the rotary switch SW ₃ of the current limiting part 2 is placed at its terminal a, a part of the current charged in the capacitor C ₁ is a current limiter 21 having a relatively large capacity. Since the capacitor (C ₁₁ ) and the diode (D ₁ ) in the bypass (comparatively large amount of current) is bypassed to the + voltage, the charge amount of the capacitor (C ₁ ) is reduced by that much.

However, the capacitor C ₁₁ -in the current limiter 21-25 gradually changes in order of its terminal (e → d → c → b → a) of the rotary switch SW _{3 in} the current limiting part 2. Since the capacity of C ₁₅ ) decreases, that is, the capacity of the capacitor is C ₁₁ > C ₁₂ > C ₁₃ > C ₁₄ > C ₁₅ , if the rotary switch SW ₃ is located at its terminal (a), Since only a relatively small amount of current to be charged in (C ₁ ) is bypassed through the diode D ₁ to the + voltage terminal of the power supply unit 7, the charge amount of the capacitor C ₁ increases to increase its charge / discharge current. As it becomes larger, the brightness of the fluorescent lamp FL is relatively increased.

On the other hand, each of the resistors R _1- R ₅ and the thermistors TH _1- TH ₅ are connected in parallel to the capacitors C _11- C _{15 in} each current limiter 21-25. The illuminance of the fluorescent lamp FL according to the voltage fluctuation is kept constant.

For example, when the rotary switch SW ₃ in the current limiting part 2 is connected to the terminal e thereof, when the DC output voltage of the power supply 7 rises due to the change in the input power supply voltage, the resistance R _{Since the} combined resistance with ₁ ) is reduced, the bypass current amount increases to the + voltage terminal of the power supply unit 7 to maintain the load current constant.

Since the role of the thermistor TH ₁ is the same as that of the thermistor TH ₂ -TH ₅ in the other current limiter 22-25, it will be described below with respect to the action of the thermistor TH ₂ -TH ₅ . Description is omitted.

Next, when the ballast for the present invention is to be used for the AC 100V commercial voltage, the interchanging switching switches SW ₁ and SW ₂ are switched to each terminal b.

Therefore, when the voltage of AC 100V is input to the circuit of FIG. 1, the power supply 7 outputs the DC voltage rectified by the double voltage, and the choke coil L ₄ has a relatively large inductance by selecting its intermediate cap.

Increasing the inductance of the choke coil L ₄ compensates for the substantial decrease in illuminance caused by the decrease in the current flowing through the fluorescent lamp FL when the fluorescent lamp FL is turned on by double voltage rectifying the AC 100V input voltage. .

In more detail, the power supply capacity is lowered because the drift rate when the AC100V is double-voltage rectified is much larger than the pulsation rate when the AC220V is full-wave rectified.

According to the observation, the power supply of about 3W was insufficient when the 20W fluorescent lamp was on and about 10W when the 40W fluorescent lamp was on.

That is, the illuminance of the fluorescent lamp is significantly lower when the input voltage is used as AC 100V than when using the ACD 220V.

In FIG. 1, the resonance frequency fo of the series resonance circuit by the choke coil L ₄ and the condenser C ₁ is Becomes

Here, the values of the choke coil (L ₄ ) and the condenser (C ₁ ) are determined so that fo is the frequency of 10 KHz. Since the resistance value Ro of the chocolate coil (L ₄ ) is very small, the voltage expansion rate is Q. time, Becomes

Therefore, if the inductance of the choke coil (L ₄ ) is increased, the voltage magnification factor Q is increased.If the back electromotive force at the choke coil (L ₄ ) is V _L , and the power supply voltage is V, Therefore, in the case of the AC 100V input voltage, the counter electromotive force at the choke coil L ₄ is increased by Q times the power supply voltage V, thereby compensating the illuminance of the fluorescent lamp FL.

When switching to the 100V fluorescent ballast circuit, the fluorescent lamp FL is started and turned on through the same operation process as described above, and the rotary switch SW _{3 in the} current limiting unit 2 is turned on. By switching, the illuminance of the fluorescent lamp FL can be reduced.

As described above, when the capacity of the current limiter 21-25 is properly adjusted, the load current, that is, the current of the fluorescent lamp FL, is changed to 20W, 30W, 40W,... Since it is possible to flow a rated current to the fluorescent lamp for the fluorescent lamp, it is possible to selectively light the fluorescent lamps of various capacities with a single ballast.

The present invention as described above is designed for the electronic ballast for fluorescent lamp instantaneous lighting 100V / 220V combined easily switched by the interlocking switch, and also the current consisting of a plurality of current limiter and the rotary switch for selecting the current limiter Designed to control the intensity of the fluorescent lamp or the adjustment of the energizing current by the restriction part, it is possible to adjust the intensity of the fluorescent lamp variously with a single fluorescent lamp lighting electronic ball according to the user's choice, and also to make it cheap. The distinctive effect of making it appear.

Claims (1)

In the ballast for electronic fluorescent lamp lighting composed of a power supply unit 7, an oscillation unit 4, a choke coil L ₄ , a capacitor C ₁ , and a diode D ₁ , D ₂ , 100 V of the power supply unit 7 is provided. / 220V switching switch (SW ₁ ) and choke coil (L ₄ ) tap selector switching switch (SW ₂ ) is installed in conjunction, a part of the charging current of the capacitor (C ₁ ) generated by the oscillator (4) A plurality of current limiters 21-25 and a plurality of current limiters 21-25 each composed of a resistor R ₁ -R ₅ , a capacitor C ₁₁ , and a thermistor TH ₁ -TH ₅ . The electronic fluorescent ballast for heterogeneous power supply, characterized in that the configuration is connected by bypass to the power supply (7) through a current limiter (2) comprising a rotary switch (SW ₃ ) to select.