KR920006437Y1 - Neon lamp lighting device - Google Patents

Abstract

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Description

Electronic neon ballast

1 is a circuit diagram of the present invention.

* Explanation of symbols for main parts of the drawings

1-3: filter circuit 4: double voltage circuit

5: Reverse compensation circuit 6, 7: Voltage enhancing circuit

8: half bridge circuit 9: neon trans

10: neon tube R _1- R ₁₀ : resistance

C ₁ -C ₁₆ : condenser D ₁ -D ₁₀ : diode

L ₁ -L ₅ : Coil Q ₁ -Q ₂ : Transistor

TH: Thermistor BD: Rectifier Circuit

DIAC: DIAC SW: Switch

PT ₁ -PT ₂ : POLY SWITCH

The present invention relates to a neon ballast for supplying high pressure to the neon tube, and more particularly to an electronic neon ballast to reduce the power consumption by adjusting the supply current according to the type of neon tube using a half-bridge circuit.

Neon ballasts are generally used to supply neon tubes by using only simple neon transformers. However, they are not only high power consumption but also high leakage current, bulky and load short. Many problems were caused by the destruction of the transformer itself.

Therefore, the present invention was devised to solve the above problems. By adjusting the capacitance of the capacitor using the half-bridge circuit, it is possible to save power by supplying an appropriate current according to the type of neon tube. The purpose of this paper is to provide an electronic neon ballast that can protect the neon tube by blocking the overcurrent supply in the internal short circuit of the neon tube by adding a poly switch (PT).

Hereinafter, described in detail by the accompanying drawings as follows.

As shown in FIG. 1, the AC input voltage is applied to the rectifier circuit BD through the fuse F, thermistor TH and the filter circuit 1, and at the same time, via the switching switch SW, the double voltage circuit 4 is applied. The filter circuits (2) and (3) are connected to the compensating circuit (5) at the output terminals of the rectifier circuit (BD) and the double voltage circuit (4) while the output voltages of the filter circuits (2) and (3) are applied. Are connected to the voltage drop circuit 7 and the diode D ₅ (D ₈ ), respectively, through the transistors Q ₁ (Q ₂ ), the resistor R ₇ and the diac (DIAC) of the half bridge circuit 8. In addition, the output of the filter circuit (2) (3) connects the diode (D ₉ ) (D ₁₀ ) and the capacitor (C ₁₅ ) (C ₁₆ ), and the neon transformer (9) is connected to the diode (D ₉ ) (D ₁₀ ). And a condenser (C ₁₅ ) (C ₁₆ ) and a condenser (C ₁₄ ) and a choke coil (L ₅ ) to the transformer (TS) primary side of the half bridge circuit (8). On the polis between voltage drop circuit (6) (7) and transistor (Q ₁ ) (Q ₂ ) It is an electronic neon ballast made by connecting the teeth (PT ₁ ) (PT ₂ ).

Referring to the effect of the present invention made of the configuration as described above are as follows.

First, when AC 220V voltage is applied from the input terminal, the momentary inrush current is prevented by the thermistor (TH), and then the high and low frequencies are cut off in the filter circuit (1) to pass only the frequency of the proper region to the rectifier circuit (BD). send.

Therefore, rectification of the AC voltage eliminates the noise included in the output voltage of the rectifying circuit BD in the filter circuits 2 and 3, and improves the power factor of the rectifying circuit BD by performing phase compensation. If the rectified pulsation from (BD) is directly applied to the condenser (C ₅ ) (C ₆ ), it causes phase difference and distortion, resulting in low voltage.)

Therefore, the stable voltage passing through the filter circuit (2) (3) is divided by the capacitor (C ₁₅ ) (C ₁₆ ) and transmitted to the neon transformer (9) to turn on the neon tube (10), but the coil (L ₅₎ ), The current flowing through the neon tube 10 can be adjusted.

At this time, when the current through the choke coil (L ₅ ) is applied to the transformer (TS) of the half-bridge circuit (8) is induced to the secondary coil (L ₄ ) (L ₄ ') voltage drop circuit (6) (7) Limits the bias voltage that is hydraulic to the base of transistors Q ₁ and Q ₂ .

That is, when the capacitor C ₁₁ (C ₁₂ ) is charged by the voltage drop and the voltage of the coil L ₄ (L ₄ ′) is at the “low” level, the capacitor C ₁₁ (C ₁₂ ) discharges and the transistor is discharged. The switching operation is performed by reverse biasing (Q ₁ ) and (Q ₂ ).

Therefore, after the induced voltage of the coil L4 is dropped in the voltage drop circuit 6, the transistor Q ₁ and Q ₂ are turned on through the _polyswitch PT ₁ and PT ₂ to thereby condenser C _l5 (C). ₁₆ ) When the transformer TS stops operating because the power supply is not supplied to the power supply, the holding voltage of the coil L ₄ (L ₄ ′) becomes the “low” level, and thus the capacitor C ₁₁ (C ₁₂ ) discharges. Transistor (Q ₁ ) (Q ₂ ) turns off, but at this point the trigger field is generated from DIAC by resistor (R ₇ ) and condenser (C ₇ ) time constants. ₂ ) Only the turn-on state is maintained and the neon transformer 9 is supplied with power, and voltage is induced again in the coil L ₄ (L ₄ ′) of the half-bridge circuit 8 to repeat the operation as described above. By doing so, the neon transformer 9 generates high pressure to turn on the neon tube 10.

On the other hand, when the inlet voltage is AC 110V, when the switching switch SW is turned ON, the voltage is boosted from the double voltage circuit 4 to DC 220V, and the power factor correction circuit 5 supplies stable power.

When the internal short circuit of the neon tube 10 occurs, the internal resistance value of the poly switch PT ₁ (PT ₂ ) connected to the base of the transistors Q ₁ and Q ₂ of the half bridge circuit 8 rises to infinity and the transistor ( Q ₁ ) (Q ₂ ) It prevents destruction and automatically returns when the short-circuit state is released, enabling stable operation.

Here, resistors R ₇ and diodes D ₆ are used to protect the die solution (DIAC) and diodes D ₅ (D ₈ ) (D ₉ ) (D ₁₀ ) are used to prevent leakage inductance and reverse current of the coil.

In addition, the output current can be adjusted according to the capacity of the capacitor (C ₁₃ ) (C ₁₄ ) according to the size of the neon tube (1) to maximize the power consumption and at the same time filter circuit (2) (3) and voltage distribution circuit (4). DC output voltage can be easily adjusted by adjusting the capacitors (C ₅ -C ₈ ). The present invention, which operates as described above, provides a condenser by providing an electronic neon ballast in which the half bridge circuit 8, the filter circuit 1-3, the double voltage circuit 4 and the power factor correction circuit 5 are interconnected. (C ₁₃ ) (C ₁₄ ) The capacity is adjusted to supply the appropriate current according to the type and size of neon tube 10, minimizing power consumption and enabling dual / 110V use by the double voltage circuit (4). And by adding a poly switch (PT ₁ ) (PT ₂ ) it is a useful design that can reduce the protection and volume of the neon tube 10 by blocking the over-current supply when the neon tube 10 inside short.

Claims (2)

The AC input voltage is applied to the rectifier circuit BD through the fuse F, thermistor TH, and the filter circuit 1, and is applied to the double voltage circuit 4 via the switching switch SW. The output circuit of the filter circuits (2) and (3) is connected to the power factor correction circuit (5) while the filter circuits (2) and (3) are connected to the output terminals of the BD) and the double voltage circuit (4). Is connected to the voltage drop circuit 7 and the diode D ₅ and D ₆ via transistor Q ₁ , Q ₂ and resistor R ₇ and DIAC, respectively. (3) The output terminal connects a diode (D ₉ ) (D ₁₀ ) and a capacitor (C ₁₅ ) (C ₁₆ ), and a neon (9) is connected to a diode (D ₉ ) (D ₁₀ ) and a capacitor (C ₁₅ ) ( C _{16 and} connected to the transformer TS primary side of the half bridge circuit 8 via a capacitor C ₁₄ and a choke coil L ₅ , while the voltage drop circuit 6 of the half bridge circuit 8 ( 7) and the transistor (Q ₁₎ (a u position (PT ₁₎ (PT ₂₎ between Q ₂₎ Electronic ballast neon, characterized in that the hayeoseo result. The type of neon tube 10 according to claim 1, wherein the capacitance of the capacitor C ₁₄ connected between the condenser C ₁₃ and the choke coil L ₅ and the neon transformer 9 of the half bridge circuit 8 is adjusted. And Electronic neon ballast characterized in that the output current can be controlled according to the size.