KR900007391B1 - Arrangements for neon lamps - Google Patents

Abstract

The ballast having a protection circuit of high voltage caused by the short of the secondary winding equips a residual light flush switch (S2) for lighting constantly. In abnormal state, like no-load operation, the secondary winding (r,w) induces the high voltage applied to a triac (TC1). The current flowing through the conjunctions (P1,P2) stops the switching function of transistors (TR1-2). The voltage at this time is applied to a capacitor (C2) so that the voltage is not applied to a transformer (TB). A capacitor (C7) and a resistor (R7) are for preventing the triac (TC1). A capacitor (C8) and a resistor (R9) are for absorbing the instantaneous shock voltage.

Description

Ballast for Electronic Neon Light

1 is a circuit diagram of the present invention.

* Explanation of symbols for main parts of the drawings

D1-D11: Diode DC1: Diaak

L1: Choke Coil TR1, TR2: Transistor

EC1-EC3: Electrolytic Capacitor TC1: Triac

R1-R9: resistor S1, S2: switch

TA, TB, TC: Transformer P1, R2: Connection Point

C1-C9: Capacitor a-w: Between coil windings

L0: Load 1: Smoothing circuit

2: protection circuit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit for inducing high voltage using a switching operation of a transistor, which is a semiconductor element, and a high frequency transformer. In particular, the switching operation of the switching circuit is repeated to generate a high voltage on the secondary side of the transformer to light a neon lamp. A ballast for an electronic neon lamp.

Conventionally, in order to supply the high voltage necessary for lighting the neon light, the transformer method wound the copper wire on the iron core coil was used, but in order to obtain the high voltage necessary for the lighting of the neon light, As the transformer was needed, the size and weight of the product was naturally large and heavy. In addition, when the high voltage is induced to the secondary side of the transformer through the switching circuit, the neon lamp is turned on.However, when a single wire accident occurs due to the life or destruction of the neon lamp due to the installation of the neon lamp in the room, The vehicle side was not only in danger of causing a fire or an electric shock by continuing to induce abnormal high voltages due to no-load conditions.In addition, the disconnection and lifetime of neon lights caused the breakage of the secondary side, and the primary side of the transformer continued. There was a problem of losing a lot of power because it is energized. In addition, in the conventional method, the lighting and blinking of the neon light are driven by the switch of the input side AC power, and the neon ball of the electronic ballast flashes by the continuous switching method of the input side AC power for repeated blinking which is an advantage of the neon light. After flashing by the charging voltage accumulated in the electrolytic capacitor and coil in the smoothing circuit, it was discharged gradually and afterglow was caused by the neon lamp, so it was not possible to obtain a clear blinking effect. There was a problem that could not be emitted.

The present invention has been made in order to correct the conventional re-defect and electronic ballast as described above, in the circuit of the present invention to detect the abnormal high voltage of the secondary disconnection accident is attached to the protection circuit for blocking the primary side power supply It is intended to prevent the risk of fire or electric shock due to disconnection accident.In case of flickering afterglow flickering switch is installed on the output side of the smoothing circuit, it prevents the afterglow of the problem and emits light continuously. In addition, the electronic circuit is designed to be miniaturized and lightweight, and to be easily installed and handled.

Referring to the configuration of the present invention having such a feature in detail as follows.

The (+) side line drawn out from the smoothing circuit (1) is an afterglow flickering switch (S2) connected to the other (-) side drawn out of the smoothing circuit (1) in which the condenser (C2) and (C3) are formed in series. ), The primary winding between the transformer (TB) (a) is drawn between the connection between the capacitor (C2) and (C3), and then between the primary winding (b) of the transformer (TB) Is connected between the collector side of the transistor TR1 and the connection of the emitter of the transistor TR2 via the connection, and the (+) side line drawn out from the smoothing circuit 1 is connected to the collector of the transistor TR2. The resistor R2 and the diaak DC1 are connected to the base of the transistor TR1. In addition, the base of the transistor TR2 is connected to the secondary winding between g of the transformer TA through the electrolytic capacitor EC2, the resistor R3 and the diode D5 configured in parallel, and then It is connected to the emitter of the transistor TR2 via (h). The transistor TR2 is protected by connecting the positive side of the diode D9 to the collector of the transistor TR2 and the negative side of the diode D9 to the emitter of the transistor TR2. In addition, the secondary winding winding i of the transformer TA is connected to the base of the transistor TR1 via the electrolytic capacitor DE3, the resistor R4, and the diode D6 configured in parallel, but this transistor is The collector of TR1 is connected to the emitter of transistor TR2, and the emitter of transistor TR1 is between the secondary winding of the transformer TA, j, resistor R2 and diaak DC1. The capacitor (C1) connected between the connections of the two occupies and connects to the all-optical light switch (S2). The positive side of the protective diode D10 of the transistor TR1 is connected to the collector of the transistor TR1, and the negative side of the transistor TR1 is connected to the emitter of the transistor TR1 to protect the transistor TR1. Further, the primary winding winding e of the transistor TA is connected to the winding winding c of the transformer TB through the tone capacitor C4 and the resistor R5 configured in parallel, and the winding winding f is performed. ) Are connected to the windings d of the transformer TB through the capacitor C7 and the resistor R6 configured in parallel, respectively. In addition, the winding k of the transformer TB connects the diode D7 and the capacitor C5, and the other winding 1 connects the diode D8 and the capacitor C6 in parallel. Then, it is configured by connecting to the load (L0) side. In addition, between the winding side m of the transformer TB and the secondary winding r of the transformer TC drawn out from (n), the diode D11 and the resistor R8 in the forward direction are connected in series. Then connect it to the gate terminal of the triac TC1. In addition, the second terminal of the triac TC1 is connected to the connection point P2, and another terminal of the first terminal of the triac TC1 is connected to the winding w of the transformer TC so as to connect the connection point ( After connecting to P1), the resistor R7 and the capacitor C8 are connected between the gate terminal of the triac TC1 and the winding of the transformer TC, and in series with the capacitor C. The resistor R is connected to each other in parallel on the line between the windings r and w of the transformer TC to form the protection circuit 2.

Referring to the operation and effect of the present invention having the configuration as described above are as follows.

The AC input power is converted into a pulse current through the bridge rectifier circuits D1-D4, and the pulse current is smoothed by the choke coil L1, the electrolytic capacitor EC1, and the resistor R1 to become a direct current. Here, the coil L1 serves as a filter for filtering out the noise caused by the high frequency to the input side, and when the constant voltage is reached through the resistor R2 and the capacitor C1, the diac DC1 conducts the transistor ( The current in the forward direction flows through the base and emitter of TR1, and the transistor TRl is turned on. At this time, the current is between the primary windings of the choke coil L1, the capacitor C2, and the transformer TB. Through and (b), current flows through the afterglow switch S2 through the collector and emitter of the transistor TR1. The voltage generated between the primary windings (a) and (b) of the transformer TB is induced between the windings c and d, and the induced voltage is again 1 of the transformer TA. It is guided between the secondary windings (e) and (f). In addition, the primary voltage applied between the windings (e) and (f) is induced between the secondary windings (g) and (h), (i) and (j), where the secondary winding of the transformer (TA) The gaps g, h, i, and j have different directions of voltage induced due to the configuration in which the winding directions are opposite to each other. As a result, a reverse voltage is induced between the windings i and j so that the transistor TR1 is turned off, and a forward voltage is induced between the windings g and h to turn the transistor TR2 on. The direction of the current passes through the choke coil L1, the collector of the transistor TR2, and the emitter from the winding b of the transformer TB to (a), followed by the condenser C3 and afterglow flashing. It flows through the switch S2. In this case, voltages in opposite directions are generated between the windings a and b of the transformer TB so that the transistors TR1 and TR2 alternately switch, and the primary side of the transformer TB is turned on. The voltage shown between the windings (a) and (b) generates a high voltage between the secondary windings (k) and (1) to turn on the neon light. Here, just before the neon light is turned on, the diodes D7 and D8, the capacitors C5 and C6 act as a voltage divider and a filter to smoothly and smoothly turn on the electrolytic capacitor EC2 and the resistor R3 and The diode D5 smoothly turns ON / OFF the transistor TR2, and the electrolytic capacitor EC3, the resistor R4, and the diode D6 smoothly turn ON / OFF the transistor TR1, and the capacitor C4, The C7 and the resistors R5 and R6 become factors for determining the switching time, that is, the frequency, of the transistors TR1 and TR2. In addition, the afterglow flicker of neon lights is controlled by the afterglow flicker switch S2. When the ballast is not turned on normally, that is, when the ballast is operated in a no-load state in which no neon light is connected due to the life or breakage of the neon light, between the secondary windings of the transformer TB (k), (1 ) Is a high voltage, which is induced between the windings (m) and (n) of the transformer (TB), and this induced voltage is again between the primary windings (o) and (of the transformer (TC). It is applied to p) and guided to the secondary windings r and w. At this time, the induced voltage applies a voltage to the gate of the triac TC1 through the diode D11 and the resistor R8, and at the same time, the current conducted through the connection points P2 and P1 is the choke coil L1. And connection point P2 and triac TC1, and connection point P1 and afterglow switch S2 through the primary windings (a) and (b) of the transformer TB via the condenser C2. Since the transistors TR1 and TR2 do not perform a switching operation, and the voltage at this time is in a state in which the capacitor C2 is applied, no voltage appears in the transformer TB. Here, the capacitor C7 and the resistor R7 protect the gate of the triac TC1, and the capacitor C8 and the resistor R9 absorb the instantaneous shock voltage.

The present invention can prevent the fire and other electric shock accidents in advance, even if a disconnection accident occurs due to the life or destruction of the neon light due to blocking the network through the protection circuit (2), and also clear afterglow Blinking effect can be obtained is very efficient invention.

Claims (4)

The secondary side of the transformer TA in the ballast for electronic neon lamps which is integrally formed by connecting a switching circuit, transformers TA, and TB to a rectifying circuit and a smoothing circuit 1 for rectifying and smoothing a normal AC power supply. Between the windings (g) and (h) connect an electrolytic capacitor (EC2), a resistor (R3) and a diode (D5) configured in parallel to the transistor (TR2), and the secondary winding between the transformer (TA) (i) ) And (j) are connected to the electrolytic capacitor (EC3), the resistor (R4) and the diode (D6) configured in parallel to the transistor (TR1) in the opposite direction between the winding (g), (h) and the winding. The capacitor C2 connected to the choke coil L1 of the smoothing circuit 1 is connected to the afterglow switch S2 and the emitter of the transistor TR1 via the capacitor C3, and then the capacitor C2. ) Is connected between the collector of transistor TR1 and the emitter connection of transistor TR2. The primary side of the transformer TA is the winding of the transformer TB via the capacitors C4 and C7 and the resistors R5 and R6 that determine the frequencies of the transistors TR1 and TR2. Ballast for electronic neon lights characterized in that the neon light is turned on by generating a high voltage by the switching operation by the configuration connected to the (c) and (d). The method of claim 1, wherein the diode (D7) and the capacitor (C5) connected to the secondary winding between the secondary winding (TB) of the transformer (TB) in parallel to one side of the neon light, 2 of the transformer (TB) Electronic neon, characterized in that the lighting of the neon light smoothly to enable partial voltage and filtering by the configuration in which the diode (D8) and the condenser (C6) connected to the secondary winding 1 in parallel to the other side of the neon light Back ballast. The anode 1 of the triac TC1 between the secondary winding between the transformer TC and the connection point P1 connected between the afterglow switch S2 and the condenser C3. The terminals are connected at the same time, and the anode 2 terminal of the triac TC1 is connected to the connection point P2 between the winding b of the transformer TB and the collector of the transistor TR1, and then The gate terminal of the triac TC1 is connected to the winding r of the transformer TC via the resistor R8 and the diode D11, but the resistor R7 and the capacitor C8 are connected to the triac TC1. Interposed between the gate terminal of the transistor and the winding of the transformer TC, and the interconnection of the capacitor C9 and the resistor R9 to each other between the windings of the transformer TC (r) and (w). The protective circuit 2 configured to intervene between the triac (TC1) by detecting the high voltage induced when the secondary load of the transformer (TB) is unloaded due to a disconnection accident Neon lamp operated by the electronic ballast, characterized in that the high voltage to block at least to prevent the baljil. 2. The afterglow blinking switch S2 of claim 1, wherein the smoothing circuit 1 is connected to a negative terminal of the electrolytic capacitor EC1, a negative side of the rectifying circuit, and a connection point P1 of the resistor R1. After connecting one terminal, the other terminal of the afterglow flashing switch S2 flashes the afterglow flashing switch S2 formed by connecting to the junction of the capacitors C1 and C3 to the emitter of the transistor TR1. Ballast for electronic neon lamps, characterized in that afterglow of the neon lamp can be removed.

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