KR200407446Y1 - Electronic ballast with initial lighting auxiliary circuit - Google Patents

Abstract

The present invention relates to an electronic ballast having an initial lighting auxiliary circuit, an instant start type electronic ballast comprising: a bridge rectifier (2) for rectifying a commercial AC voltage into a pulse current voltage; A voltage charging unit 4 charged by the rectified voltage of the bridge rectifying unit 2; A boost converter (3) for charging the voltage charging section (4) with a constant charging voltage of the pulsating voltage rectified by the bridge rectifying section (2); An inverter triggering unit (6) for generating a trigger signal by using the charging voltage charged in the voltage charging unit (4); An inverter unit 7 performing a high-speed switching function by a trigger signal by the inverter trigger unit 6; A lamp unit 11 which is turned on in response to voltage resonance by the switching operation of the inverter unit 7; And a pulse current rectified at the time of initial lighting from the bridge rectifier 2 is turned on to connect a lamp common line of the lamp unit 11 to a ground line, so that a small current flows to the corresponding ground line. Initial lighting auxiliary circuit 10 for activating the diameter of the fluorescent lamp; Characterized in that it comprises a.

Instant start, ballast

Description

Electronic ballast with initial lighting auxiliary circuit {ELECTRONIC BALLAST HAVING STARTING AID CIRCUIT}

1 is an overall block diagram illustrating an electronic ballast having an initial lighting auxiliary circuit according to an embodiment of the present invention.

2 is an overall circuit diagram illustrating an electronic ballast having an initial lighting auxiliary circuit according to an embodiment of the present invention.

3 is a view for explaining the initial lighting auxiliary circuit and its operating characteristics according to an embodiment of the present invention.

4 is a view for explaining the initial lighting auxiliary circuit and its operating characteristics according to another embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

1: AC input 2: bridge rectifier

3: boost converter unit 4: voltage charging unit

5: charging voltage detection unit 6: inverter trigger unit

7: inverter 8: resonator

9: operating voltage applying unit 10: initial lighting auxiliary circuit

11: lamp unit

The present invention relates to an electronic ballast having an initial lighting auxiliary circuit. More specifically, the instantaneous lighting of a fluorescent lamp which requires a high tube voltage and a large start current when the lamp is turned on, the lamp is turned on only by a low tube voltage and a low start current during the initial lamp. An electronic ballast having an initial lighting auxiliary circuit which facilitates the operation and extends the life of the lamp.

In general, the ballast continuously supplies a constant voltage to the lamp to interrupt the discharge of the lamp, thereby maintaining the lighting of the lamp continuously.

Since the lamp has a negative voltage-current characteristic, when the initial lamp is turned on, the voltage continuously decreases and the current rises, eventually destroying the lamp. Therefore, to prevent this phenomenon, a ballast is required, and after lighting, the ballast supplies a constant voltage to the lamp to limit the current.

Here, ballasts are divided into magnetic ballasts and electronic ballasts. Electronic ballast rectifies AC 60Hz commercial power using DC element to make DC (DC), and converts it into high frequency of 25-50KHz in inverter circuit and turns on lamp stably through output current limiting glh. do.

Such electronic ballasts include instant start type electronic ballasts and soft start type electronic ballasts. The instant start type electronic ballasts do not heat the filament of the lamp and turn on instantaneously with a high discharge voltage. It is an electronic ballast of the type, which can be stably lit even in a fluorescent lamp with a very high lamp voltage, and can obtain a very stable characteristic against voltage fluctuations.

However, when the recently developed life extension fluorescent lamp is turned on by the instant start method, it is very difficult to turn on the instant start method because a high tube voltage and a large start current are required.

That is, the instant start type electronic ballast developed for the conventional fluorescent lamp does not deteriorate its lighting characteristics when the general lamp is turned on. However, as described above, the life-span lamp having a high output voltage and a large amount of current must be flowed at the start of the lamp. It is true that lighting is virtually impossible.

Although the lamp is turned on with a high tube voltage and a high start current, the instantaneous overvoltage and tube current are applied to the lamp during the lighting process, and the life of the lamp is considerably shortened. Furthermore, under no load due to excessive load There is a problem that causes a failure of the ballast.

The present invention has been made to solve the above problems, the purpose of the instant start-type electronic ballast in the instant start-type electronic ballast for instantaneous lighting of the fluorescent lamp with a high discharge voltage without heating the filament of the lamp during the initial lighting, By connecting the lamp common line with the ground line of the inverter and adding an initial lighting auxiliary circuit that activates the diameter of the fluorescent lamp by flowing a small current, it is possible to turn on the life-long fluorescent lamp that requires a high tube voltage and a large start current. It is to provide an electronic ballast having an initial lighting auxiliary circuit to be easily made.

Electronic ballast having an initial lighting auxiliary circuit of the present invention for achieving the above object, the instant start type electronic ballast, Bridge rectifier (2) for rectifying the commercial alternating voltage to a pulse current voltage; A voltage charging unit 4 charged by the rectified voltage of the bridge rectifying unit 2; A boost converter (3) for charging the voltage charging section (4) with a constant charging voltage of the pulsating voltage rectified by the bridge rectifying section (2); An inverter triggering unit (6) for generating a trigger signal by using the charging voltage charged in the voltage charging unit (4); An inverter unit 7 performing a high-speed switching function by a trigger signal by the inverter trigger unit 6; A lamp unit 11 which is turned on in response to voltage resonance by the switching operation of the inverter unit 7; And a pulse current rectified at the time of initial lighting from the bridge rectifier 2 is turned on to connect a lamp common line of the lamp unit 11 to a ground line, so that a small current flows to the corresponding ground line. Initial lighting auxiliary circuit 10 for activating the diameter of the fluorescent lamp; Characterized in that it comprises a.

Preferably, the initial lighting auxiliary circuit 10 receives the DC voltage rectified through the bridge rectifying unit 2 as an operating voltage at the initial lighting, and the switching element Q4 through the internal differential circuits C16 and R20. Outputs the differential signal to the base end of the switch to turn on the corresponding switching element Q4, and according to the operation of the corresponding switching element Q4, the capacitor C17 and the photo connected to the common common line and the round GND line By operating the coupler (U1), it is characterized in that for a predetermined time to flow a small current from the lamp common line (common) to the ground (GND) line.

More preferably, the initial lighting auxiliary circuit 10 receives the DC voltage rectified through the bridge rectifying unit 2 as an operating voltage at the initial lighting, and switches the switching element Q4 through the internal integrating circuits R20 and C16. Outputs an integrated signal to the base end of the &lt; RTI ID = 0.0 &gt;) and turns on the corresponding switching element Q4. &Lt; / RTI &gt; according to the operation of the switching element Q4, the capacitor C17 and the photo connected to the common common and ground lines GND The coupler U1 is operated so that a minute current flows from the lamp common line to the ground GND line for a predetermined time.

More preferably, the connection time between the lamp common line and the ground line is 0.5 seconds to 1 second.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention.

Hereinafter, the present invention will be described as an electronic ballast having an initial lighting auxiliary circuit as a preferred embodiment, but the technical idea of the present invention is not limited or limited thereto and can be variously implemented by those skilled in the art.

1 is an overall block diagram illustrating an electronic ballast having an initial lighting auxiliary circuit according to an embodiment of the present invention, Figure 2 is an overall diagram for explaining an electronic ballast having an initial lighting auxiliary circuit according to an embodiment of the present invention 3 is a diagram illustrating an initial lighting auxiliary circuit and its operating characteristics according to an embodiment of the present invention, and FIG. 4 illustrates an initial lighting auxiliary circuit and its operating characteristics according to another embodiment of the present invention. It is a figure for demonstrating.

As shown in FIG. 1, an electronic ballast having an initial lighting auxiliary circuit according to an exemplary embodiment of the present invention includes an AC input unit 1, a bridge rectifying unit 2, a boost converter 3, a voltage charging unit 4, and a charging voltage detection unit. (5), inverter trigger section 6, inverter section 7, resonator section 8, operating voltage application section 9, initial lighting auxiliary circuit 10, and lamp section 11, respectively.

Referring to FIG. 2, an electronic ballast having an initial lighting auxiliary circuit will be described. First, the AC input unit 1 receives a commercial AC power supply, and fuses to block an AC voltage of an overvoltage from being applied. ) And line capacitors (LF) and second capacitors for suppressing a phenomenon in which unwanted electromagnetic waves generated from various electric and electronic equipments cause electromagnetic interference to communication or other devices, and removing high frequency noise components contained in AC voltage. C2).

The bridge rectifier 2 is composed of bridge diodes D1 to D4 for converting an AC voltage applied through the AC input unit 1 into a DC voltage to obtain a required pulse current voltage. It includes a smoothing capacitor (C3) responsible for the smoothing of.

The boost converter 3 performs a function of charging the voltage charging unit 30 with a constant charging voltage of the pulsating voltage converted by the bridge rectifying unit 2, and includes a power factor correcting IC (IC) and a plurality of resistors. R1 to R9, a plurality of capacitors C4 to C6, diodes D5 and D7, a boost transformer T1, and a field effect transistor Q1.

Here, the boost converter unit 3 draws a pulse current voltage as an input voltage from the resistors R1 to R3 and the capacitor C4 and adjusts a reference pulse width corresponding to the height of the corresponding pulse voltage, thereby controlling the internal field effect transistor Q1. Will be activated. Due to the operation of the field effect transistor Q1, the boost transformer T1 generates a high induced voltage (V _L = −L · di / dt (V)).

The induced voltage V _L of the boost transformer T1 is charged in the voltage charging part 4 via the eighth diode D8.

The voltage charging unit 4 performs a function of charging an induced voltage generated by the switching of the boost converter unit 3, and includes a diode D8 and charging capacitors C7 and C8.

In addition, the charging voltage detector 5 detects the charging voltage charged in the voltage charging unit 4 and controls the pulse width of the boost converter 20 to maintain the charging voltage constant. And resistors R10 to R12.

That is, the charging voltage charged in the charging capacitors C7 and C8 of the voltage charging unit 4 is detected by the resistors R10 to R12 of the charging voltage detecting unit 5 so that the IC of the boost converter unit 3 is increased. It is calculated with a comparison voltage (for example, 2.5V) inside the IC to charge the charging capacitors C7 and C8 by controlling the pulse width of the gate of the field effect transistor Q1.

Here, when the charging voltage of the capacitors C7 and C8 is higher than the set voltage, the gate pulse width of the field effect transistor Q1 is decreased, and when the charging voltage is lower than the set voltage, the corresponding pulse width is widened to make the charging voltage constant. Will be maintained.

Meanwhile, the inverter trigger unit 6 performs a function of triggering the inverter unit 7 by using the charging voltage charged in the voltage charging unit 4. The diode D10 and the resistors R13 to R15 And a capacitor C9 and a diac.

The inverter unit 7 performs the fast switching function by the trigger signal generated by the inverter trigger unit 6, and includes diodes D9, D11, D12, and D12, resistors R16 and R17, and capacitors C10, C11), transistors Q2 and Q3 and coil L5.

The resonator 8 performs a function of turning on the lamp of the lamp unit 11 by resonating the high speed switching voltage by the inverter unit 7, and includes a capacitor C12 to C14 and a transformer T3. do.

The AC input unit 1, the bridge rectifier 2, the boost converter 3, the voltage charging unit 4, the charging voltage detection unit 5, the inverter trigger unit 6, the inverter unit 7, and the resonance unit 8 ) And the operation of the ballast according to the configuration of the lamp unit 11 will be described in more detail as follows.

First, the commercial AC voltage through the AC input is changed into the pulse current through the bridge rectifier 2 composed of the diodes D1 to D4 through the fuse and the line filter LF, and the boost converter 3 Is applied.

The pulsed voltage applied to the boost converter 3 is supplied with an initial start voltage to the power factor correction IC through the resistors R3 and R4 and the capacitor C5 to operate the power factor correction IC.

In addition, the pulse voltage applied to the boost converter 3 is detected by the resistors R1, R2 and R5 and the capacitor C4 and connected to the input voltage comparator of the power factor correcting IC IC to connect the field effect transistor Q1. The switching width is adjusted to keep the induced voltage (V _L = -L · di / dt (V)) of the transformer T1 constant.

The secondary induction voltage of the transformer T1 forms the driving voltage of the integrated circuit through the diode D5 and the resistor R6, and the field effect transistor Q1 and the transformer T1 through the resistor R7. Synchronization eliminates switching losses.

In addition, the switching current of the boost converter 3 is detected by the resistor R8 so that the pulse width of the field effect transistor Q1 is controlled to maintain the induced voltage of the transformer T1 constant.

In addition, the induced voltage of the transformer T1 is charged to the voltage charging unit 4 including the diode D8 and the capacitors C7 and C8 by the DC voltage DC by the switching operation of the boost converter 3. .

In addition, the charging voltage charged in the voltage charging unit 4 is applied to the charging voltage detection unit 5 including the resistors R10, R11, and R12, and the charging voltage detection unit 4 applies the applied charging voltage. By detecting and controlling the pulse width of the boost converter section 3 to maintain a constant charging voltage.

On the other hand, the voltage of the voltage charging unit 4 forms a trigger signal in the inverter trigger unit 6 composed of a diode D10, resistors R13 to R15, a capacitor C9, and a diac. The trigger signal formed triggers the transistor Q3 of the inverter unit 7 to operate the inverter unit 7. In addition, the resistor R13 of the inverter trigger unit 6 serves to help the switching of the transistor Q2 to improve the operation characteristics of the inverter.

In addition, a square wave is generated at the point X by the switching operation of the inverter unit 7. The generated square wave induces voltage resonance in the transformer T3 and the capacitor C12 of the resonator unit 8. As the secondary induced voltage is generated, the generated secondary induced voltage turns on the lamp of the lamp unit 11 through the capacitors C13 and C14.

On the other hand, the present invention, in the basic instant start ballast structure that instantaneously lights up the fluorescent lamp with a high discharge voltage without heating the filament of the lamp at the initial lighting, life-span fluorescence requiring high tube voltage and a large start current at the time of lighting An initial lighting auxiliary circuit 10 is provided to light a lamp.

First, an operating voltage applying unit 9 is connected to the output side of the bridge rectifying unit 2 to provide power for operating the initial lighting auxiliary circuit 10.

The operating voltage applying unit 9 is composed of a diode D6, a resistor R18, and a capacitor 15, and is connected to the output side of the bridge rectifying unit 2 to rectify the pulse voltages rectified by the corresponding bridge rectifying unit 2. Induced to apply an operating voltage to the initial lighting auxiliary circuit (10).

The initial lighting auxiliary circuit 10 provided with the operating voltage through the operating voltage applying unit 9 has a sixteenth capacitor C16 and a twentieth resistor R20 provided with the operating voltage from the operating voltage applying unit 9. ) Forms a differential circuit, and the differential circuit and the base side of the fourth transistor Q4 are connected. In this way, a zener diode D14 is connected between the differential circuits C16 and R20 that receive a DC operating voltage and the operating voltage applying unit 9, and a photo coupler is connected to the collector side of the fourth transistor Q4 that operates as a switch. U1 is to be connected.

In addition, one end of the photo coupler U1 is connected to the lamp common line of the lamp unit 11 through a seventeenth capacitor C17, and the other end thereof is the ground GND of the corresponding inverter unit 7. Connected by a line. R19, which is not described here, is the tenth resistor.

The initial lighting auxiliary circuit 10 configured as described above receives the pulsed voltage rectified by the bridge rectifying unit 2 through the operating voltage applying unit 9 when the initial lighting is performed. Accordingly, the differential circuits C16 and R20 generate the differential signal and operate the photo coupler U1 while the fourth transistor Q4 is turned on in accordance with the differential signal. By the operation of the photo coupler U1, a small current flows through the seventeenth capacitor C17 to the ground GND line of the inverter side through the lamp common line.

Therefore, in the instant start type electronic ballast which instantaneously lights up the fluorescent lamp at a high discharge voltage without heating the filament of the lamp during the initial lighting, the above-described fluorescent lamp discharge voltage induced by the resonator 8 during the initial lighting process is described above. The photocoupler U1 and the seventeenth capacitor C17 of the initial lighting auxiliary circuit 10 are operated to flow a small current of the common lamp side common line to the inverter ground GND line, so that the diameter of the dimming light and the like is reduced. Is to facilitate instant start.

The operation and operation characteristics of the initial lighting auxiliary circuit 10 will be described in more detail with reference to FIG. 3.

The rectified DC voltage rectified by the bridge rectifying unit 2 is a control voltage of DC 15V as shown in (a) control voltage characteristic diagram of FIG. 3 through the operating voltage applying unit 9. Will be entered.

When the control voltage DC 15V is input to the initial lighting auxiliary circuit 10 as described above, the zener diode D14 has the zener voltage characteristic as shown in (b) Zener voltage characteristic diagram of FIG. 3 according to the input of the control voltage. Appears and a zener current flows accordingly.

The Zener current generates a differential signal as shown in the differential circuit characteristic diagram of FIG. 3 in a differential circuit composed of a capacitor C16 and a resistor R20.

As shown in (d) lighting improvement circuit operation characteristic diagram of FIG. 3, the differential signal turns on the NPN-type fourth transistor Q4 for a predetermined time (for example, about 0.5 seconds). Accordingly, the photocoupler U1 operates to flow a small current through the lamp common line during the corresponding time through the seventeenth capacitor C17 to the ground (GND) line of the inverter so that the fluorescent lamp has a high discharge voltage. In the initial lighting of the instant start method to instantaneously turn on to activate the diameter of the corresponding fluorescent lamps it is possible to smoothly induce lighting.

Meanwhile, the differential circuits C16 and R20 for generating the differential signal from the initial lighting auxiliary circuit 10 to operate the photocoupler U1 may be replaced with the integral circuits R20 and C16 as shown in FIG. 4. Do.

As shown in FIG. 4, an integrating circuit in which a twentieth resistor R20 is connected to an input side and a sixteenth capacitor C16 is connected to an output side thereof, and a base end of a fourth transistor Q4, which is a switching element, is connected therebetween ( R20 and C16 are similar to the above-described differential circuits C16 and R20, the instant start type electronic ballast which instantaneously lights up a fluorescent lamp at a high discharge voltage without heating the filament of the lamp during initial lighting, By supplying a predetermined integrated signal to the switching element (Q4) to induce the operation of the photo coupler (U1) and the seventeenth capacitor (C17) to allow a small current of the lamp common lamp common line (flow) to flow to the inverter ground (GND) line It is to facilitate the instant start by activating the diameter of the luminescent light.

In this case, the fourth transistor receiving the differential signal at the base end of the differential circuits C16 and R20 is an NPN transistor, and the fourth transistor receiving the integrated signal at the base end of the integration circuits R20 and C16 is a PNP transistor. to be.

The operation and operation characteristics of the initial lighting auxiliary circuit 10 using the integrated circuits R20 and C16 will be described below.

That is, as shown in (a) control voltage characteristic diagram of FIG. 4, the DC voltage rectified by the bridge rectifying unit 2 is a control voltage of DC 15V through the operating voltage applying unit 9. 10), and when the control voltage DC 15V is input to the initial lighting auxiliary circuit 10, the zener diode D14 is shown in the zener voltage characteristic diagram of FIG. 4 according to the input of the corresponding control voltage. The zener voltage characteristics as shown above appear and the zener current flows accordingly.

The zener current generates an integrated signal as shown in the integrated circuit characteristic diagram of FIG. 4 in an integrated circuit composed of a resistor R20 and a capacitor C16.

The integrated signal turns on the fourth transistor Q4 of the PNP type for a predetermined time (for example, about 0.5 second) as shown in (d) lighting improvement circuit operation characteristic diagram of FIG. (U1) operates to instantaneously turn on the fluorescent lamp with a high discharge voltage by flowing a small current through the lamp common line during the corresponding time through the seventeenth capacitor C17 to the ground (GND) line of the inverter. In the initial lighting of the start method, the diameter of the corresponding fluorescent lamp is activated, so that the lighting can be induced smoothly.

At this time, in the initial lighting process (about 0.5 seconds to 1 second), the photocoupler U1 and the seventeenth capacitor C17 of the initial lighting auxiliary circuit 10 described above are turned on to turn the lamp common line to the ground (GND) line of the inverter. In this case, the time for flowing a small current to the corresponding ground (GND) line is preferably about 0.5 seconds.

The present invention described above is possible to those skilled in the art to which the present invention belongs, various substitutions, modifications and changes can be made within the scope without departing from the spirit of the present invention and the above-described embodiments and attached It is not limited to the drawing.

As described above, the child ballast having the initial lighting auxiliary circuit shown in the present invention is an instant start electronic ballast in which the fluorescent lamp is instantaneously turned on at a high discharge voltage without heating the filament of the lamp during the initial lighting. By connecting the lamp common line with the ground line of the inverter when it is lit, it adds an initial lighting auxiliary circuit that activates the diameter of the fluorescent lamp by flowing a small current. This has the effect of making it smooth.

In addition, the above-mentioned initial lighting auxiliary circuit can be easily added to the inverter of the conventional instant start type electronic ballast, so that the high tube voltage and the large start current at the time of lighting without large change to the existing instant start type electronic ballast production line. There is also an effect that can be applied and produced by optimizing for a life-long fluorescent lamp requiring a.

Claims (4)

In the electronic ballast of the instant start method, A bridge rectifier 2 for rectifying the commercial AC voltage into the pulse current voltage; A voltage charging unit 4 charged by the rectified voltage of the bridge rectifying unit 2; A boost converter (3) for charging the voltage charging section (4) with a constant charging voltage of the pulsating voltage rectified by the bridge rectifying section (2); An inverter triggering unit (6) for generating a trigger signal by using the charging voltage charged in the voltage charging unit (4); An inverter unit 7 performing a high-speed switching function by a trigger signal by the inverter trigger unit 6; A lamp unit 11 which is turned on in response to voltage resonance by the switching operation of the inverter unit 7; And The pulse rectifying voltage rectified at the time of initial lighting from the bridge rectifier 2 is turned on to connect a lamp common line of the lamp unit 11 with a ground line to allow a small current to flow to the corresponding ground line. Initial lighting auxiliary circuit 10 for activating the diameter of the fluorescent lamp; Electronic ballast having an initial lighting auxiliary circuit comprising a. The method of claim 1, The initial lighting auxiliary circuit 10 receives a DC voltage rectified through the bridge rectifying unit 2 as an operating voltage at the initial lighting, and passes through the internal differential circuits C16 and R20 to the base end of the switching element Q4. Outputs the differential signal to turn on the switching element Q4, and according to the operation of the switching element Q4, the capacitor C17 and the photocoupler U1 connected to the lamp common line and the ground GND line are connected. An electronic ballast having an initial lighting auxiliary circuit, wherein a small current flows from a common lamp line to a corresponding ground line for a predetermined time. The method of claim 1, The initial lighting auxiliary circuit 10 receives a DC voltage rectified through the bridge rectifying unit 2 as an operating voltage at the initial lighting, and is connected to the base end of the switching element Q4 through internal integration circuits R20 and C16. Outputs an integrated signal to turn on the corresponding switching element Q4, and according to the operation of the corresponding switching element Q4, the capacitor C17 and the photocoupler U1 connected to the lamp common line and the ground GND line are connected. An electronic ballast having an initial lighting auxiliary circuit, wherein a small current flows from a common lamp line to a corresponding ground line for a predetermined time. The method of claim 2 or 3, The electronic ballast having an initial lighting auxiliary circuit, characterized in that the connection time between the common lamp (common) and ground (GND) line is 0.5 seconds to 1 second.

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