KR100419180B1 - Ballast stabilizer capable of heat ignition in the conditions of preheating - Google Patents

Abstract

The present invention relates to a hot light preheating electronic ballast.

The present invention includes a voltage stabilizer, a rectifier, a driver, an inverter, and a resonator to convert a commercial power frequency into a high frequency, and then use the same to stabilize the fluorescent lamp. The electronic ballast includes an inductor, a capacitor, and a filament. Preheat the fluorescent lamp for a certain period of time with the sine wave preheating frequency converted by the L, R, C resonant circuit, and then turn on the fluorescent lamp while the preheating frequency of the preheating section is changed to the lighting frequency of the lighting section. It is characterized in that configured to lower the voltage and current.

According to the present invention, it is possible to implement an electronic ballast that can improve the energy consumption efficiency by consuming only the minimum current in the lighting section and can extend the lamp life by not burdening when the lamp is turned on.

Description

BALLAST STABILIZER CAPABLE OF HEAT IGNITION IN THE CONDITIONS OF PREHEATING}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic ballast, and more particularly, to a warming-up type electronic ballast capable of extending the life of a fluorescent lamp and improving energy consumption efficiency.

In general, an electronic ballast converts a commercial power supply frequency (60 Hz) into a high frequency and then turns on a fluorescent lamp using the same. At this time, the oscillator oscillating at various frequencies is used to implement the preheating, electric light, and dimming processes. The preheating process is to prevent blackening during the discharge of the fluorescent lamp, and the dimming process is to adjust the brightness of the fluorescent lamp to adjust the power. It is for efficient use.

1 is a circuit diagram of a conventional general electronic ballast. Referring to FIG. 1, a conventional electronic ballast may be divided into a power stabilizer 100, a rectifier 110, a driver 120, an inverter 130, and a resonator 140.

Power stabilization unit 100 is composed of a filter circuit such as transformer (LF), capacitors (YC1, YC2, XC3), and the like to filter and stabilize the AC power of 220V, 60Hz input.

The rectifier 110 includes a bridge diode (V1-V4), a resistor (ST1), and capacitors (MC1, MC2), etc., rectifying the commercial AC voltage input from the power stabilization unit 100 and smoothed out Convert to DC voltage.

The driver 120 includes a PWM IC IC1, a transistor MQ1, a Zener diode ZD1, a capacitor C1, C2, C3, and C5, and resistors R1, R4, R6, R7, R9, and R10. In addition, the DC voltage applied from the rectifier 110 is converted into a high frequency conversion signal voltage to generate a switching frequency.

Looking at the circuit of the driver 120 in detail, the parallel between the PWM IC (IC1), the resistor (R6) connected between the power supply (Vcc) and the node (N1), and the node (N1) and ground (GND). Connected resistor R7 and capacitor C3, zener diode ZD1 connected between node N1 and node N2, resistor R4 connected between node N2 and ground; And a transistor (MQ1) having a base terminal connected to the node N2, an emitter terminal connected to the ground, and a collector terminal connected to the node N3, and connected between the node N3 and the node N4. A capacitor C1, a capacitor C2 connected between the node N3 and ground, a resistor R1 connected between the PWM IC IC1 and the node N4, and the like.

The inverter unit 130 includes a condenser C6, FETs Q1 and Q2, and diodes V5 and V6, and the switching frequency input from the driver 120 in the trigger elements FETs Q1 and Q2. The on / off switching is alternately performed to convert the DC voltage input from the rectifier 110 into the high frequency voltage of the square wave.

The resonator unit 140 includes a resonant inductor L1, a resonant capacitor C7, and capacitors PC1 and PC2, and the high frequency voltage of the square wave generated by the inverter unit 130 and the resonant inductor L1. The fluorescent lamp is converted into a sine wave converted by the resonant capacitor C5, and the fluorescent lamp is preheated and then turned on.

Now, a process made through the driving unit 120, the inverter unit 130, and the resonator unit 140 of the conventional electronic ballast configured as described above will be described.

The PWM IC IC1 has a gate output function of the MOS FET according to the frequency set by the resistor R1 and the capacitors C1 and C2. When the power is applied to the PWM IC IC1, the set frequency is generated. It is input to the inverter unit 130.

By the way, when the base terminal of the transistor MQ1 is triggered and current flows from the collector terminal of the transistor MQ1 to the emitter terminal, since the C1 capacitor and the C2 capacitor are connected in series, the charge is gradually discharged, which is illustrated in FIG. As shown, the frequency of about 80 KHz in the preheating section is gradually lowered linearly to fall to the frequency of about 40 KHz in the lighting section.

This makes it impossible to know at what point the ignition (lighting) of the fluorescent lamp starts, resulting in an overcurrent flowing above the reference value even after the fluorescent lamp is turned on. Therefore, not only the energy consumption efficiency is lowered, but also the filament is exerted, thereby shortening the lamp life.

Accordingly, the present invention has been made in order to solve the above problems, preheat the fluorescent lamp at a high frequency for a certain time and turn on when the frequency changes suddenly to prevent overcurrent consumed through the filament after the energy consumption efficiency The aim is to provide a preheating electronic ballast with a heating lamp that not only improves but also extends the life of the fluorescent lamp.

In order to achieve the above object, the warming-up preheating type electronic ballast according to the present invention includes a voltage stabilizer 300 and a commercial alternating voltage applied from the voltage stabilizer 300 to filter and stabilize the commercial AC voltage. The rectifier 310 converts the voltage into a voltage, the driver 320 converting the DC voltage applied from the rectifier 310 into a high frequency conversion signal voltage to generate a switching frequency, and according to the switching frequency generated from the driver 320. The inverter unit 330 for switching the DC voltage applied from the rectifier 310 to convert the high frequency voltage of the square wave, and the high frequency voltage of the square wave applied from the inverter unit 330 into a sine wave to light up the fluorescent lamp after preheating. In the electronic ballast comprising a resonator 340 to be,

The driving unit 320 includes a PWM IC IC1, a capacitor C4 connected between the power supply Vcc and the node N1, and a diode D1 connected between the node N1 and the ground GND. ), A resistor R8 connected between the node N1 and the node N2, a resistor R7 connected between the node N2 and the ground, and a base terminal connected to the node N2. And an emitter terminal connected to the ground, a collector terminal connected to the node N3, a resistor R6 connected between a power supply and the node N3, and between the node N3 and the ground. A capacitor R3 connected to the resistor C, a resistor R5 connected between the node N3 and a node N4, a resistor R4 connected between the node N4 and ground, and the node N4. Transistor MQ1 connected to a base terminal, an emitter terminal connected to node N5, and a collector terminal connected to node N6, and a resistor R3 connected between the node N5 and ground. A capacitor C1 connected between the node N6 and the node N7, a resistor R1 connected between the PWM IC IC1 and the node N7, and between the node N7 and ground. A capacitor (C2) and a resistor (R2) connected in series,

The resonator 340 may include a transformer (T) including a primary winding (T1) and secondary windings (T2, T3), an inductor (L1) connected in series with the secondary winding (T2) of the transformer (T), And a capacitor C9, an inductor L2 connected in series with the secondary winding T3 of the transformer T, and a capacitor C10.

When the transistor MQ2 is turned on and operated while the capacitor C4 is being charged, the PWM IC IC1 outputs a switching frequency (preheating frequency) set by the resistor R1 and the capacitor C2. The high frequency voltage of the square wave switched and converted by the inverter unit 330 is alternately induced in the secondary windings T2 and T3 of the transformer T to form the inductor L1, the capacitor C9, and the filament of the fluorescent lamp. Or preheat the fluorescent lamp with a sine wave converted through the L, R, C resonance circuit composed of the inductor L2, the capacitor C10, and the filament of the fluorescent lamp,

After the transistor MQ2 is turned on and operated, the induced current increases through the collector terminals of the resistor R6 and the transistor MQ2 so that the transistor MQ1 is turned on to operate the resistor R1 and the capacitor. A switching frequency (lighting frequency) set to C1, C2) is output, and the fluorescent lamp is turned on while the preheating frequency changes to a lighting frequency.

1 is a circuit diagram of a conventional electronic ballast,

2 is a conceptual diagram illustrating a frequency change for each time zone of a conventional electronic ballast;

3 is a circuit diagram of an electronic ballast according to the present invention;

4 is a schematic diagram showing an output frequency of a PWM IC applied according to the present invention;

5 is a conceptual diagram illustrating a frequency change for each time zone of the electronic ballast according to the present invention;

6 is a gate drive output waveform and a ramp current waveform of the preheating section according to the present invention;

7 is a gate drive output waveform and a lamp current waveform of the lighting section according to the present invention;

8 is a ramp current waveform and a ramp voltage waveform of a preheating section / lighting section according to the present invention;

9 is a ramp current waveform and a filament voltage waveform of the preheating section / lighting section according to the present invention.

* Explanation of symbols for main parts of the drawings

100,300: voltage stabilizer 110,310: rectifier

120,320: driver 130,330: inverter

140,340: resonator

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

3 is a circuit diagram of an electronic ballast according to the present invention. Referring to FIG. 3, the power stabilizer 300, the rectifier 310, the driver 320, the inverter 330, and the resonator 340 are configured.

Since the power stabilizer 300, the rectifier 310, and the inverter 330 are the same as those of the conventional general electronic ballast described with reference to FIG. 1, the power stabilizer 300, the rectifier 310, and the inverter unit 330 are the same as those of the driving unit 320 and the resonator 340. This will be described in detail.

The driving unit 320 outputs a driving signal when a DC voltage is applied from the rectifying unit 310. The driving unit 320 includes a PWM IC (IC1), a transistor (MQ1, MQ2), and a capacitor (C1-C5) in the form of a MOS FET Gate Drive IC. , Diodes D1, and resistors R1-R10. Figure 4 is a schematic diagram showing the output frequency of the PWM IC applied in accordance with the present invention.

Looking at the circuit of the driving unit 320 in detail, the PWM IC (IC1), the capacitor (C4) connected between the power supply (Vcc) and the node (N1), and the connection between the node (N1) and ground (GND) Diode D1, resistor R8 connected between node N1 and node N2, resistor R7 connected between node N2 and ground, and node N2. A transistor MQ2 having a base terminal connected, an emitter terminal connected to ground, and a collector terminal connected to a node N3, a resistor R6 connected between a power supply and the node N3, and the node N3; ), A capacitor C3 connected between the ground, a resistor R5 connected between the node N3 and the node N4, a resistor R4 connected between the node N4 and the ground, A transistor MQ1 having a base terminal connected to the node N4, an emitter terminal connected to the node N5, and a collector terminal connected to the node N6, and the node N5 and the graph; Resistor R3 connected between the node, the capacitor C1 connected between the node N6 and the node N7, and the resistor R1 connected between the PWM IC IC1 and the node N7. And a capacitor C2 and a resistor R2 connected in series between the node N7 and ground.

In addition, the resonator 340 converts the high frequency voltage of the square wave applied from the inverter unit 230 into a sine wave to preheat the fluorescent lamp and then turns on the primary winding T1 and the secondary windings T2 and T3. A transformer (T), an inductor (L1) connected in series with the secondary winding (T2) of the transformer (T), and a capacitor (C9), and an inductor connected in series with the secondary winding (T3) of the transformer (T). And a condenser C10 and the like.

Now, a process made through the driving unit 320, the inverter unit 330, and the resonator unit 340 of the electronic ballast will be described.

Basically, the PWM IC IC1 has a gate output function of the MOS FET according to the frequency set by the resistor R1 and the capacitors C1 and C2, so that the set switching when the power is applied to the PWM IC IC1 Frequency is generated and output.

The capacitor C4 is charged according to the capacitance through an applied power source, and the transistor MQ2 is turned on to operate while charging is in progress. That is, while the base terminal of the transistor MQ2 changes from low to high, the transistor MQ2 becomes conductive. After the transistor MQ2 is operated, the transistor MQ1 is turned on and operated by increasing the induced current through the collector terminals of the resistor R6 and the transistor MQ2.

By the way, when the transistor MQ2 is operating but the transistor MQ1 is not operating, the capacitor C1 does not work and thus the switching frequency (preheating frequency) set by the resistor R1 and the capacitor C2. ) Is output through the PWM IC (IC1).

Then, the inverter unit 330 switches the DC voltage applied from the rectifying unit 310 according to the switching frequency to convert the high frequency voltage of the square wave. At this time, the high frequency voltage of the square wave is alternately switched between the FET Q1 and the FET Q2 so that the primary winding T1 of the transformer T passes through the source terminal of the FET Q1 and the drain terminal of the FET Q2. Inflow. The high frequency voltage of the introduced square wave is induced in the secondary windings T2 and T3 of the transformer T, respectively, and the filament of the inductor L1, the capacitor C9, and the fluorescent lamp, or the inductor L2 and the capacitor C10. It is converted into a sine wave through the L, R, C resonance circuit composed of the filament of the fluorescent lamp, and preheats the fluorescent lamp.

In other words, when the high frequency voltage of the square wave is induced to T2 of the secondary winding, L, R and C resonance tanks are formed according to the inductor L1, the capacitor C9, and the internal resistance R of the filament. However, when the high frequency voltage of the square wave is induced to T3 of the secondary winding, L, R, and C resonance tanks are formed according to the inductor L2, the capacitor C10, and the internal resistance R of the filament.

On the other hand, when the transistor MQ1 is turned on to operate because the induced current increases through the collector terminals of the resistor R6 and the transistor MQ2 after the transistor MQ2 operates, the capacitors C1 and C2 connected in parallel. As the capacitance doubles due to the action of), the preheating frequency drops rapidly to the operating frequency (lighting frequency). The fluorescent lamp is turned on while the preheating frequency is changed to the lighting frequency.

5 is a conceptual diagram illustrating a time-phase frequency change of the electronic ballast according to the present invention, the pre-heating section for preheating the fluorescent lamp while the frequency of about 80KHz lasts for about 1 second, and preheating of 80KHz in a short time of about 50ms The frequency is sharply lowered to an operating frequency (lighting frequency) of 40 KHz, and is divided into an ignition section for turning on the fluorescent lamp and a lighting section for keeping the operation frequency stable.

6 shows the gate drive output waveform and the lamp current waveform of the preheating section according to the present invention, and FIG. 7 shows the gate drive output waveform and the lamp current waveform of the lighting section according to the present invention. 8 shows the lamp current waveform and the lamp voltage waveform of the preheating section / lighting section according to the present invention, and FIG. 9 shows the lamp current waveform and the filament voltage waveform of the preheating section / lighting section according to the present invention.

As described above, the preheating type electronic ballast of the heating lamp forms L, R, and C resonant tanks, and after preheating the fluorescent lamp for a predetermined time, the lamp is turned on in a section in which the switching frequency changes rapidly, thereby lowering the required voltage and current. As a result, the lamp life can be extended while improving the energy consumption efficiency.

Claims (1)

A voltage stabilizer 300 for filtering and stabilizing the commercial AC voltage, a rectifier 310 for converting the commercial AC voltage applied from the voltage stabilizer 300 to a DC voltage, and a DC voltage applied from the rectifier 310. The inverter 320 converts the high frequency conversion signal voltage to generate a switching frequency, and the inverter converts the DC voltage applied from the rectifying unit 310 into a high frequency voltage of a square wave according to the switching frequency generated from the driving unit 320. In the electronic ballast comprising a unit 330, and a resonator unit 340 for converting the high frequency voltage of the square wave applied from the inverter unit 330 into a sine wave to turn on the fluorescent lamp after preheating, The drive unit 320, PWM IC IC1, capacitor C4 connected between power supply Vcc and node N1, diode D1 connected between node N1 and ground GND, and node N1. ) Is connected between node (N2) and node (N2), resistor (R7) is connected between node (N2) and ground, and base terminal is connected to node (N2), and emitter terminal is connected to ground. Transistor MQ2 connected to a collector terminal connected to node N3, a resistor R6 connected between a power supply and the node N3, and a capacitor C3 connected between the node N3 and ground. And a resistor R5 connected between the node N3 and the node N4, a resistor R4 connected between the node N4 and the ground, and a base terminal connected to the node N4. An emitter terminal connected to the node N5 and a collector terminal connected to the node N6, a resistor R3 connected between the node N5 and the ground, and the node N6;Capacitor C1 connected between node N7, resistor R1 connected between PWM IC IC1 and node N7, and capacitor C2 connected in series between node N7 and ground. ) And a resistor (R2), The resonator 340, A transformer (T) consisting of a primary winding (T1) and secondary windings (T2, T3), an inductor (L1) connected in series with the secondary winding (T2) of the transformer (T), and a capacitor (C9), Including an inductor (L2) and a capacitor (C10) connected in series with the secondary winding (T3) of the transformer (T), When the transistor MQ2 is turned on and operated while the capacitor C4 is being charged, the PWM IC IC1 outputs a switching frequency (preheating frequency) set by the resistor R1 and the capacitor C2. The high frequency voltage of the square wave switched and converted by the inverter unit 330 is alternately induced in the secondary windings T2 and T3 of the transformer T to form the inductor L1, the capacitor C9, and the filament of the fluorescent lamp. Or preheat the fluorescent lamp with a sine wave converted through the L, R, C resonance circuit composed of the inductor L2, the capacitor C10, and the filament of the fluorescent lamp, After the transistor MQ2 is turned on and operated, the induced current increases through the collector terminals of the resistor R6 and the transistor MQ2 so that the transistor MQ1 is turned on to operate the resistor R1 and the capacitor. And outputs a switching frequency (lighting frequency) set to C1, C2, and turns on a fluorescent lamp while the preheating frequency changes to a lighting frequency.