KR101251378B1 - Ceramic poles fluorescent lamp type electronic ballast using ceramic-glass composite electrode - Google Patents

Abstract

PURPOSE: A ceramic pole fluorescent lamp type electronic ballast using a ceramic-glass composite electrode is provided to improve the driving stability and the reliability of a lamp by controlling output voltage and current according to the number of lamps. CONSTITUTION: An electromagnetic wave filter(1100) removes electromagnetic waves from input AC and supplies the output. A rectifier(1200) rectifies the AC from the electromagnetic wave filter and supplies the output. A power factor compensation and smoothing unit(1300) corrects and smoothes the output of the rectifier to output DC. A switching unit(1400) changes the DC into AC according to the switching signal provided from a switching signal generator(1800). A multi-wire type transformer(1600) supplies the AC to a fluorescent lamp(1900) having a ceramic-glass composite electrode. A constant voltage and constant current controller(1500) compensates for the power factor of the AC supplied from the rectifier. [Reference numerals] (1100) Electromagnetic wave filter; (1200) Rectifier; (1300) Power factor compensation and smoothing unit; (1400) Switching unit; (1500) Constant voltage and constant current controller; (1600) Multi-wire type transformer; (1700) Over-voltage and over-current protection unit; (1800) Switching signal generator; (1900) Fluorescent lamp; (AA) AC power source;

Description

Electronic ballast for fluorescent lamp using ceramic-glass composite electrode {CERAMIC POLES FLUORESCENT LAMP TYPE ELECTRONIC BALLAST USING CERAMIC-GLASS COMPOSITE ELECTRODE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic ballast fluorescent lamp for a ceramic pole glass fluorescent lamp (CPFL) using a ceramic-glass composite electrode, and in particular, to eliminate unbalanced lighting of a lamp, to avoid accidents caused by lamp breakage, and to realize a high power factor. And an electronic ballast for fluorescent lamps using ceramic-glass composite electrodes.

Recently, with the rapid economic development, the landscape lighting, advertising lighting, indoor and outdoor lighting market is increasing and continues to develop.

In recent years, environmental concerns and regulations are being made worldwide, and accordingly, the lighting market is changing to a new lighting trend with little energy saving and environmental pollution.

Fluorescent lamps using ceramic-glass composite electrodes and ferroelectric electrodes with spontaneous polarization are fluorescent lamps that will be newly introduced in the lighting market. The fluorescent lamps complement the shortcomings of conventional fluorescent lamps. It is a fluorescent lamp that generates higher luminance than conventional fluorescent lamps by maximizing the emission amount of secondary electrons generated during collision of the lamp.

The electrode of this lamp is ceramic-glass composite and ferroelectric with spontaneous polarization. It has higher dielectric constant than external electrode lamp, and there is almost no change in dielectric constant at low temperature, so it can be stably lit and dimmed at low temperature. In addition, there is no difficulty in production by size, so it is suitable to be used as direct / indirect lighting for indoor interior in department stores, hotels, hospitals, theaters and banquet halls.

In this regard, Figure 1 is a circuit diagram showing an embodiment of an electronic ballast for a fluorescent lamp having an overvoltage protection circuit according to the prior art.

In the figure, first, the rectifier 100 inputs an AC power supply through a fuse F1 for protecting a circuit from a surge voltage.

The noise canceling circuits LTA1, LTB1, C1, C2, and C3 in the rectifier 100 filter the noise components of the AC power input through the fuse F1 and provide them to the bridge circuits D1, D2, D3, and D4. .

The bridge circuits D1, D2, D3, and D4 provide full-wave rectification of AC power provided through the noise canceling circuits LTA1, LTB1, C1, C2, and C3 to both ends of the capacitor C5.

The capacitor C5 removes the ripple component from the full-wave rectified power provided from the bridge circuits D1, D2, D3, and D4, and outputs a direct current to the charging unit 150.

The capacitor C12 in the charging unit 150 charges the direct current provided from the capacitor C5 through the coil BT1 and the diodes D10 and D11.

The high frequency driving unit 200 is driven by receiving a direct current provided from the capacitor C12 and includes a first switching unit 210, a second switching unit 220, and a fluorescent lamp 400 configured in a half bridge manner.

The first switching unit 210 includes a first switching transistor Q1 and base driving circuits R1, R5, R6, and C9 of the first switching transistor Q1.

The second switching unit 220 includes the second switching transistor Q2, the base driving circuits R2, R7, R8, and C10 of the second switching transistor Q2, and the start circuits DIAC and C8 for starting the switching operation. It includes.

Each of the base driving circuits R1, R5, R6, and C9 (R2, R7, R8, and C10) of the first and second switching units 210 and 210 is magnetically coupled by a transformer LT2.

The RC circuits R3 and C4 provide the DC power provided from the charging unit 150 as the switching voltage.

The first and second switching units 210 and 220 increase the efficiency of the power provided to the fluorescent lamp 400 by inducing DC power provided from the charging unit 150 at a high frequency while switching at a high frequency.

Capacitors C6, C7, and C8 alleviate the impact of fluorescent lamp 400 due to the current delivered to fluorescent lamp 400.

As the induction coil PT1 is connected between the fluorescent lamp 400 and the transformer LT2, the efficiency of power provided to the fluorescent lamp 400 by mutual induction between the transformer LT2 and the induction coil PT1 in the high frequency switching process. Is higher. At this time, the output terminals T1 and T2 of the high frequency driving unit 200 are connected to both sides of the fluorescent lamp 400, respectively.

Meanwhile, the overvoltage protection circuit 300 includes a transformer LT3 having primary windings connected to both sides of the fluorescent lamp 400.

The double voltage rectification circuit 310 is composed of diodes D12 and D13 and capacitors C16 and C17 connected to the secondary winding side of the transformer LT3.

Between the common contact of the transformer LT3 and the terminal T4 of the fluorescent lamp 400 and the low voltage side of the double-pressure rectifying unit 310, resistors R12 and R13 and a silicon controlled rectifier (SCR) Q3 serving as switching elements are in series. Leads to.

The anode of the SCR Q3 is connected to the common contact of the terminal T4 and the cathode is connected to the low pressure side of the double pressure rectifying unit 310. The switching control units R9, R10, R11, R14, R15, ZD1, C14, and C15 are connected between the gate of the SCR Q3 and the high voltage side of the double pressure rectifying unit 310.

On the other hand, the anode of the SCR (Q3) is connected to the base of the switching transistor (Q2) of the second switching unit 220 through the diode (D14) for preventing the reverse current and at the same time to supply the DIAC and the starting voltage It is connected to the common contact of the capacitor (C8) for.

Such a conventional technology is provided with a protection circuit capable of preventing damage to the fluorescent lamp 400 and the ballast by shutting down the operation of the ballast when the overvoltage for a predetermined time or more is continuously applied to the fluorescent lamp 400. At this time, if the user replaces the new fluorescent lamp, the SCR Q3 is reset to the normal operation state.

However, in the related art, a method of directly controlling an external AC power source for dimming functions is frequently used. In this case, an unnecessary power loss occurs and causes a failure of an inverter circuit.

In addition, the ballast according to the related art is provided with a protection circuit, but the cost increases due to the use of expensive SCR (Q3), low efficiency due to iron loss and copper loss, to the discontinuous peak generated in the rectifier 100 Low power factor.

The present invention has been made to solve the above problems, to provide an electronic ballast for a fluorescent lamp using a ceramic-glass composite electrode to eliminate the unbalanced lighting of the lamp, to avoid accidents due to lamp breakage, and to implement a high power factor The purpose is to.

In order to achieve this object,

According to an aspect of the present invention,

An electromagnetic wave filter 1100 for removing and outputting electromagnetic waves from an input AC power source;

A rectifier 1200 for rectifying and outputting AC power output from the electromagnetic wave filter 1100;

A power factor correction and smoothing unit 1300 for outputting a direct current by compensating and smoothing the output of the rectifying unit 1200;

A switching unit 1400 for outputting alternating current by switching the DC output from the power factor correction and smoothing unit 1300 according to a switching signal provided from the switching signal generator 1800;

The lottery-type transformer which inputs the alternating current output from the switching unit 1400 into the primary coil and induces the secondary coil to provide the fluorescent lamp 1900 having ceramic-glass composite electrodes on both sides through the secondary coil. (1600);

A constant voltage and constant current controller 1500 for comparing the direct current output from the power factor correction and smoothing unit 1300 with a set reference voltage so that the power factor correction and smoothing unit 1300 maintains a constant voltage and current; And

By controlling the switching signal generated by the switching signal generator 1800 according to the voltage and current of the lottery transformer 1600, the overvoltage and overcurrent are not applied to the primary coil to which the output of the switching unit 1400 is input. Overvoltage and overcurrent protection unit 1700 to prevent;

And a control unit.

The power factor correction and smoothing unit 1300 detects a current flowing in the secondary coil of the power factor correction inductor 1301 including the primary coil and the secondary coil through the zero current detection terminal ZCDI, and detects the voltage phase detection terminal MI. After sensing the set current at the input terminal, compare the two sensed currents and control them so that there is no difference in current phase so that there is no difference in voltage and current phases, switching between output terminal and ground through output terminal (DO) A power factor correction integrated circuit 1306 for intermittently controlling the power factor correction switch 1302 to compensate for the power factor is provided.

The power factor correction switch 1302 is made of a field effect transistor.

The ground terminal of the power factor correction switch 1302 is connected to ground through a current sensing resistor 1303.

The power factor correction inductor 1301 is characterized by consisting of a primary coil and a secondary coil corresponding to the primary coil connected between the input terminal and the output terminal.

A resistor R and a diode D are connected in parallel between the gate terminal of the field effect transistor and the output terminal DO of the power factor correction integrated circuit 1306, so that excessive current is applied to the power factor correction switch 1302. A protection circuit 1307 is provided to prevent the flow.

The constant voltage and constant current controller 1500 generates a power factor control signal from the output of the power factor correction and smoothing unit 1300 and provides the power factor control signal to a feedback terminal VF of the power factor correction integrated circuit 1306 to provide the power factor correction integrated circuit ( 1306 controls the power factor correction and smoothing unit 1300 to maintain a constant output voltage and current.

The constant voltage and constant current control unit 1500,

A constant voltage voltage dividing resistor unit 1501 for dividing the DC voltage output from the power factor correction and smoothing unit 1300 to become a constant voltage;

A reference voltage unit 1502 for generating a reference DC voltage;

Comparing, amplifying and integrating the divided DC voltage of the constant voltage voltage dividing resistor unit 1501 and the reference DC voltage of the reference voltage unit 1502 to generate a first power factor control signal to integrate the power factor compensation through the photocoupler 1504. A first op amp 1503 providing a feedback terminal VF of the circuit 1306;

A constant current control voltage dividing resistor unit 1505 for dividing the reference DC voltage of the reference voltage unit 1502 to become a constant current; And

Comparing, amplifying, and integrating the current according to the switching of the switching unit 1400 and the constant current according to the divided voltage of the constant current control voltage divider resistor 1505 to form a second power factor control signal and to mix it with the first power factor control signal. 2 op amps 1510;

And a control unit.

According to the present invention, the power factor is prevented from being reduced by the discontinuous peak current generated in the rectifier 1200.

In addition, the power factor may be prevented from being reduced due to the phase difference between the commercial voltage and the current, and the power factor correction and smoothing unit 1300 compensates for the power factor of the rectified AC power provided from the rectifying unit 1200 and maintains a constant voltage and current. Can be maintained to ensure stable output.

In addition, the power factor correction and smoothing unit 1300 may be used to actively compensate the power factor for various input power sources.

In addition, by controlling the output voltage and current in accordance with the variation in the number of lamps used, the stability of the lamp driving is high and reliable, and the overvoltage and overcurrent protection unit 1700 is provided so that when the lamp breaks or no loads, The application of the abnormal voltage to the secondary coil side is prevented.

1 is a circuit diagram showing an embodiment of an electronic ballast for a fluorescent lamp having an overvoltage protection circuit according to the prior art.
2 is a block diagram showing an embodiment of an electronic ballast for a fluorescent lamp using a ceramic-glass composite electrode according to the present invention.
FIG. 3 is a circuit diagram illustrating an embodiment of the power factor correction and smoothing unit illustrated in FIG. 2.
4 is a circuit diagram illustrating an embodiment of the constant voltage and constant current controller shown in FIG. 2.
FIG. 5 is a circuit diagram illustrating an example of the switching signal generator illustrated in FIG. 2 and its surroundings.

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

2 is a block diagram showing an embodiment of an electronic ballast for a fluorescent lamp using a ceramic-glass composite electrode according to the present invention, an electromagnetic wave filter 1100, rectifier 1200, power factor correction and smoothing unit 1300, switching unit 1400, a constant voltage and constant current controller 1500, a lottery-type transformer 1600, an overvoltage and overcurrent protection unit 1700, a switching signal generator 1800, and a fluorescent lamp 1900.

The present invention configured as described above will be described with reference to FIGS. 3 and 5.

3 is a circuit diagram illustrating an embodiment of the power factor correction and smoothing unit 1300 illustrated in FIG. 2, and FIG. 4 is a circuit diagram illustrating an embodiment of the constant voltage and constant current controller 1500 illustrated in FIG. 2. FIG. 2 is a circuit diagram illustrating an example of the switching signal generator 1800 shown in FIG.

2 to 5, first, the electromagnetic wave filter 1100 removes and outputs electromagnetic waves from an AC power input.

The rectifier 1200 rectifies and outputs AC power output from the electromagnetic wave filter 1100.

The power factor correction and smoothing unit 1300 compensates and smoothes the output of the rectifier 1200 to output a direct current.

Referring to FIG. 3, one embodiment of the power factor correction and smoothing unit 1300, the power factor correction integrated circuit 1306 includes a power factor including a primary coil and a secondary coil through a zero current detection terminal (ZCDI). Detects the current flowing through the secondary coil of the compensation inductor 1301 and detects the current set at the input terminal through the voltage phase detection terminal MI, and compares the detected currents so that there is no difference in the current phase. The power factor is compensated by intermittently controlling the power factor correction switch 1302 for switching between the output terminal and the ground through the output terminal DO in a state where there is no difference in the current phase. At this time, the power factor correction switch 1302 is made of a field effect transistor and the ground terminal is connected to the ground through the current sense resistor 1303. The power factor correction inductor 1301 is composed of a primary coil and a secondary coil corresponding to the primary coil connected between the input terminal and the output terminal.

Accordingly, the current flowing through the power factor correction inductor 1301 increases linearly, and when the voltage across the current sensing resistor 1303 connected to the power factor correction switch 1302 increases above the reference value, the power factor correction switch 1302 is performed. A diode 1304 that is turned off and connected to the output side of the power factor correcting inductor 1301 is turned on to charge the capacitor 1305 that is connected between the output terminal of the diode 1304 and ground.

At this time, the resistance R between the gate terminal of the field effect transistor constituting the power factor correction switch 1302 and the output terminal DO of the power factor correction integrated circuit 1306 to prevent excessive current from flowing in the power factor correction switch 1302. ) And a diode (D) is provided with a protection circuit 1307 connected in parallel.

On the other hand, in order to control the output voltage and current of the power factor correction and smoothing unit 1300 to be kept constant, the output voltage and current must be kept constant by monitoring the output. For example, the constant voltage and constant current controller 1500 generates a power factor control signal from the output of the power factor correction and smoothing unit 1300 and provides the power factor control signal to the feedback terminal VF of the power factor correction integrated circuit 1306 to provide the power factor correction integrated circuit 1306. The power factor correction and smoothing unit 1300 controls the output voltage and the current to be kept constant.

In addition, a secondary coil is formed in the lottery-type transformer 1600 to rectify and smooth the AC output of the secondary coil to be used as an operating power source of the power factor correction integrated circuit 1306 so as to efficiently use power, and at the same time, a switching unit. When an abnormality occurs in 1400, no operation power is provided to the power factor correction integrated circuit 1306 so that the power factor correction integrated circuit 1306 is prevented from being damaged.

The switching unit 1400 switches the direct current output from the power factor correction and smoothing unit 1300 according to the switching signal provided from the switching signal generator 1800 to output an alternating current. In this case, the switching unit 1400 is driven by using a half-bridge inverter driven by two switches.

Here, a terminal (VS) for controlling the discharge start voltage when the initial fluorescent lamp 1900 is driven is separately provided. The signal output from the terminal (VS) is a constant voltage control voltage divider resistor 1501 of the constant voltage and constant current controller 1500. To adjust the voltage distribution ratio to adjust the discharge start voltage so that the external environment of the fluorescent lamp 1900 adjusts the discharge start voltage at low temperature so that unbalanced lighting may be caused by impedance unbalance during parallel control of the fluorescent lamp 1900. To prevent.

Referring to FIG. 5, an exemplary circuit of the above-described switching signal generator 1800 is described. First, the fluorescent lamp driving integrated circuit 1801 in the switching signal generator 1800 is used to drive an existing fluorescent lamp. Terminals (CPH) for controlling preheating required during discharge and terminals (RPH) for controlling initial discharge start voltage (IGNITION) are additionally provided, and terminals for detecting overvoltage and overcurrent are also provided. It is provided so that the protection circuit of the inverter can be easily configured.

However, since the fluorescent lamp 1900 using the ceramic organic composite electrode has a different driving method from the conventional fluorescent lamp, the fluorescent lamp 1900 does not need to separately set the preheating and initial discharge start voltages except for the protection circuit.

The initial driving power is input by dividing the voltage at the output VL of the rectifying unit 1200, and the driving voltage is used after rectifying the alternating current supplied by the secondary winding of the lottery-type transformer 1600.

The fluorescent lamp driving circuit 1801 operates when the external voltage of the oscillator capacitor is charged when the initial voltage is applied or more, and operates the second switch 1402 through the output of the terminal LO, and sets the dead time. After a predetermined time through the DT, the first switch 1401 of the first and second switches 1401 and 1402 connected in series when the capacitor is discharged is operated.

Such an operation is repeatedly performed. At this time, the timing setting resistor RT and the capacitor CT can be adjusted externally, so that an operating frequency of the fluorescent lamp 1900 can be set. Here, since it is advantageous to adjust the resistance value rather than adjusting the capacitor, the variable resistor 1802 is connected to adjust the resistance value.

The protection circuit terminal senses the current flowing through the switching unit 1400 and is input through the overcurrent detection terminal CS, and when the detection of the current exceeds the allowable current, the operation of the fluorescent lamp driving circuit 1801 stops, thereby causing damage to the circuit and the lamp. I can protect it. In addition, a separate sensing terminal (SD) is configured to prevent overvoltage when a load abnormality occurs and detects the voltage input through the secondary winding of the lottery type transformer 1600 to determine whether there is an abnormality. In operation, the operation of the fluorescent lamp driving circuit 1801 is stopped.

The signal through the switching unit 1400 is transmitted to the lottery-type transformer 1600 and the transmitted signal is configured to serve to output the fluorescent lamp 1900 and the impedance and the driving voltage using the ceramic organic composite electrode.

The lottery-type transformer 1600 inputs the alternating current output from the switching unit 1400 to the primary coil and induces the secondary coil to the fluorescent lamp 1900 having ceramic-glass composite electrodes on both sides through the secondary coil. to provide.

The constant voltage and constant current controller 1500 compares the direct current output from the power factor correction and smoothing unit 1300 with the set reference voltage to determine the power factor of the rectified AC power provided by the power factor correction and smoothing unit 1300 from the rectifying unit 1200. Compensate and keep the voltage and current constant to ensure stable output.

Referring to FIG. 4, an embodiment of such a constant voltage and constant current controller 1500, the constant voltage voltage divider 1501 in the constant voltage and constant current controller 1500 may be a direct current output from the power factor correction and smoothing unit 1300. The voltage is divided to a constant voltage.

The reference voltage unit 1502 generates and outputs a reference DC voltage.

The first op amp 1503 compares, amplifies, and integrates the divided DC voltage of the constant voltage voltage dividing resistor unit 1501 and the reference DC voltage of the reference voltage unit 1502 to generate a first power factor control signal to form a photocoupler 1504. Through the feedback to the feedback terminal (VF) of the power factor correction integrated circuit 1306.

In addition, the constant current control voltage divider resistor 1505 divides the reference DC voltage of the reference voltage unit 1502 so as to be a constant current.

The second op amp 1510 compares, amplifies, and integrates the current according to the switching of the switching unit 1400 and the constant current according to the divided voltage of the constant current control voltage divider resistor 1505 to generate a second power factor control signal to control the first power factor. Mix in the signal.

Therefore, the first and second power factor control signals are mixed to the feedback terminal VF of the power factor correction integrated circuit 1306 through the photocoupler 1504, and the power factor correction integrated circuit 1306 is the rectifier 1200. It compensates the power factor of AC power input through and supplies stable power by controlling constant voltage and constant current.

The overvoltage and overcurrent protection unit 1700 controls the switching signal generated by the switching signal generator 1800 according to the voltage and the current of the lottery-type transformer 1600 to receive the lottery-type transformer into which the output of the switching unit 1400 is input. Overvoltage and overcurrent are not applied to the primary coil of 1600).

The present invention has the advantage that the power factor is prevented from being reduced by the discontinuous peak current generated in the rectifier 1200.

In addition, the power factor may be prevented from being reduced due to the phase difference between the commercial voltage and the current, and the power factor correction and smoothing unit 1300 compensates for the power factor of the rectified AC power provided from the rectifying unit 1200 and maintains a constant voltage and current. Can be maintained to ensure stable output.

In addition, the power factor correction and smoothing unit 1300 may be used to actively compensate the power factor for various input power sources.

In addition, by controlling the output voltage and current in accordance with the variation in the number of lamps used, the stability of the lamp driving is high and reliable, and the overvoltage and overcurrent protection unit 1700 is provided so that when the lamp breaks or no loads, The application of the abnormal voltage to the secondary coil side is prevented.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. In addition, it is a matter of course that various modifications and variations are possible without departing from the scope of the technical idea of the present invention by anyone having ordinary skill in the art.

1100: electromagnetic wave filter 1200: rectifier
1300: power factor correction and smoothing unit 1400: switching unit
1500: constant voltage and constant current control unit 1600: lottery-type transformer
1700: overvoltage and overcurrent protection unit 1800: switching signal generator
1900 fluorescent lamp

Claims (8)

An electromagnetic wave filter 1100 for removing and outputting electromagnetic waves from an input AC power source;
A rectifier 1200 for rectifying and outputting AC power output from the electromagnetic wave filter 1100;
A power factor correction and smoothing unit 1300 for outputting a direct current by compensating and smoothing the output of the rectifying unit 1200;
A switching unit 1400 for outputting alternating current by switching the DC output from the power factor correction and smoothing unit 1300 according to a switching signal provided from the switching signal generator 1800;
The lottery-type transformer which inputs the alternating current output from the switching unit 1400 into the primary coil and induces the secondary coil to provide the fluorescent lamp 1900 having ceramic-glass composite electrodes on both sides through the secondary coil. (1600);
The power factor correction and smoothing unit 1300 compensates the power factor of the rectified AC power provided from the rectifying unit 1200 by comparing the direct current output from the power factor correction and smoothing unit 1300 with the set reference voltage. Constant voltage and constant current control unit 1500 to maintain a constant output stably; And
By controlling the switching signal generated by the switching signal generator 1800 according to the voltage and current of the lottery transformer 1600, the overvoltage and overcurrent are not applied to the primary coil to which the output of the switching unit 1400 is input. Overvoltage and overcurrent protection unit 1700 to prevent;
Electronic ballast for fluorescent lamps using a ceramic-glass composite electrode comprising a.
The method according to claim 1,
The power factor correction and smoothing unit 1300 detects a current flowing in the secondary coil of the power factor correction inductor 1301 including the primary coil and the secondary coil through the zero current detection terminal ZCDI, and detects the voltage phase detection terminal MI. After sensing the set current at the input terminal, compare the two sensed currents and control them so that there is no difference in current phase so that there is no difference in voltage and current phases, switching between output terminal and ground through output terminal (DO) The electronic ballast for a fluorescent lamp using a ceramic-glass composite electrode, characterized in that the power factor correction integrated circuit (1306) to compensate for the power factor by intermittent power factor correction switch (1302).
The method according to claim 2,
The power factor correction switch 1302 is an electronic ballast for a fluorescent lamp using a ceramic-glass composite electrode, characterized in that consisting of a field effect transistor.
The method according to claim 2,
Grounding terminal of the power factor correction switch 1302 is an electronic ballast for a fluorescent lamp using a ceramic-glass composite electrode, characterized in that connected to the ground through the current sense resistor (1303).
The method according to claim 2,
The power factor correction inductor (1301) is an electronic ballast for a fluorescent lamp using a ceramic-glass composite electrode, characterized in that consisting of a secondary coil corresponding to the primary coil and the primary coil connected between the input terminal and the output terminal.
The method according to claim 3,
A resistor R and a diode D are connected in parallel between a gate terminal of the field effect transistor and an output terminal DO of the power factor correction integrated circuit 1306 to prevent excessive current from flowing through the field effect transistor. Electronic ballast for a fluorescent lamp using a ceramic-glass composite electrode, characterized in that the protective circuit (1307) for.
The method according to claim 2,
The constant voltage and constant current controller 1500 generates a power factor control signal from the output of the power factor correction and smoothing unit 1300 and provides the power factor control signal to a feedback terminal VF of the power factor correction integrated circuit 1306 to provide the power factor correction integrated circuit ( The electronic ballast for a fluorescent lamp using a ceramic-glass composite electrode, characterized in that 1306) controls the power factor correction and the output voltage and current of the smoothing unit 1300 to be kept constant.
The method according to claim 2,
The constant voltage and constant current control unit 1500,
A constant voltage voltage dividing resistor unit 1501 for dividing the DC voltage output from the power factor correction and smoothing unit 1300 to become a constant voltage;
A reference voltage unit 1502 for generating a reference DC voltage;
Comparing, amplifying and integrating the divided DC voltage of the constant voltage voltage dividing resistor unit 1501 and the reference DC voltage of the reference voltage unit 1502 to generate a first power factor control signal to integrate the power factor compensation through the photocoupler 1504. A first op amp 1503 providing a feedback terminal VF of the circuit 1306;
A constant current control voltage dividing resistor unit 1505 for dividing the reference DC voltage of the reference voltage unit 1502 to become a constant current; And
Comparing, amplifying, and integrating the current according to the switching of the switching unit 1400 and the constant current according to the divided voltage of the constant current control voltage divider resistor 1505 to form a second power factor control signal and to mix it with the first power factor control signal. 2 op amps 1510;
Electronic ballast for fluorescent lamps using a ceramic-glass composite electrode comprising a.

Images