WO2011159048A2

WO2011159048A2 - Led fluorescent lamp

Info

Publication number: WO2011159048A2
Application number: PCT/KR2011/004087
Authority: WO
Inventors: 박명구
Original assignee: 금호전기 주식회사
Priority date: 2010-06-17
Filing date: 2011-06-03
Publication date: 2011-12-22
Also published as: WO2011159048A3; KR20110137421A; KR101144629B1; WO2011159048A9

Abstract

Disclosed are a light-emitting diode driving circuit and a fluorescent lamp including the same. According to one embodiment of the present invention, a light-emitting diode driving circuit comprises: a light-emitting diode array unit in which a plurality of light-emitting diodes are connected in serial or in parallel; a constant current control unit which is connected in parallel to the light-emitting diode array unit; and a capacitive element which is connected in parallel to the light-emitting diode array unit. Accordingly, it is possible to provide a fluorescent lamp which maintains a constant current characteristic regardless of the types of electronic ballasts.

Description

LED fluorescent lamp

The present invention relates to an LED fluorescent lamp, and more particularly, to an LED fluorescent lamp that maintains a constant power characteristic irrespective of the characteristics of the ballast used together.

With the development of technology, the light efficiency of LEDs (Light Emitting Diodes), which have been used only for small power indicators such as indicators in the past, is being improved enough to be used in real life.

In addition, unlike other light sources, LED is an environmentally friendly light source that does not contain mercury, and is widely used as a next-generation light source used for a backlight for a portable terminal, a backlight for an LCD TV (BLU), a vehicle lamp, and general lighting.

Accordingly, incandescent lamps having low power efficiency characteristics and fluorescent lamps containing environmental waste such as mercury, which have been used as main light sources for lighting for the last 100 years, are being replaced by LED lamps.

When the LED lamp is used to replace the incandescent lamp or halogen lamp, the existing incandescent lamp or halogen lamp can be removed and the LED lamp can be installed without any configuration.

However, when the LED lamp is used as a replacement for the fluorescent lamp which is the mainstream of general lighting, it is inconvenient to replace the existing wiring or to install a dedicated ballast separately. In some cases, the luminaire itself needs to be changed.

Therefore, there is a significant economic and time burden for using LED lamps as fluorescent lamp replacements. For this reason, LED fluorescent lamps, which have many advantages in various aspects, are still in the early stage of diffusion.

The present invention has been created to solve the above problems, it can be applied to various types of electronic fluorescent ballasts, and can also be used directly connected to a general commercial AC power supply, change the type of ballast and applied voltage It is an object of the present invention to provide an LED fluorescent lamp having a stable current characteristic irrespective of a change in external operating conditions such as a change of.

LED fluorescent lamp according to an embodiment of the present invention for achieving the above object,

A light emitting diode driving circuit unit including a light emitting diode array unit in which a plurality of light emitting diodes are connected in series or in parallel, a constant current controller connected to an output port of the light emitting diode array unit, and a first capacitive element connected to an input port of the constant current controller. ; A first external connection circuit unit connected to one end of the light emitting diode driving circuit unit and including at least one external connection pin; And a second external connection circuit part connected to the other end of the light emitting diode driving circuit and including at least one external connection pin.

On the other hand, the LED fluorescent lamp according to another embodiment of the present invention, a light emitting diode array unit in which a plurality of light emitting diodes are connected in series or in parallel, a constant current control unit connected in parallel with the light emitting diode array unit, and the light emitting diode array unit and A light emitting diode driving circuit unit including a first capacitive element connected in parallel; First to fourth external connection pins; Second to fifth capacitive elements having one end connected to the first to fourth external connection pins, respectively; A first current control diode having an anode connected to the other end of the second capacitive element and a cathode connected to an anode side of the light emitting diode driving circuit unit; A second current control diode having an anode connected to a cathode side of the light emitting diode driving circuit and a cathode connected to the other end of the third capacitive element; A third current control diode having an anode connected to a cathode side of the light emitting diode driving circuit portion and a cathode connected to the other end of the fourth capacitive element; And a fourth current control diode having an anode connected to the other end of the fifth capacitive element and a cathode connected to an anode side of the light emitting diode driving circuit part.

According to the LED fluorescent lamp according to the present invention, by connecting the light emitting diode array portion to the output port of the constant current controller and the first capacitive element to the input port of the constant current controller, by supplying a constant current to the load of the light emitting diode array portion of the electronic ballast There is an effect that can maintain the constant power characteristics regardless of changes.

In addition, since both ends of the LED fluorescent lamp are formed to be symmetrical with each other, it can be applied to an existing electronic fluorescent ballast as it is, and stable current characteristics without being affected by changes in external operating conditions such as change of applied voltage. It has a sustainable effect.

Furthermore, since it is not necessary to replace the wiring inside the luminaire or to install a dedicated ballast separately, it is possible to replace the existing fluorescent lamp, and also to improve the diffusion rate of the fluorescent lamp using the light emitting diode.

1 is a circuit diagram showing a first embodiment of a light emitting diode driving circuit 100 according to the present invention.

2 is a circuit diagram showing a second embodiment of the light emitting diode driving circuit 100 according to the present invention.

3 (a) and 3 (b) are schematic diagrams of a buck converter and a diagram showing operation characteristics according to time.

FIG. 4 is a graph showing operation characteristics in the light emitting diode driving circuit of FIG. 2.

5 is a circuit diagram showing an internal configuration of a constant current controller according to one embodiment of the present invention.

6 is a circuit diagram showing a first embodiment of the LED fluorescent lamp 1000 according to the present invention.

7 is a circuit diagram showing a second embodiment of the LED fluorescent lamp according to the present invention.

8 is a circuit diagram showing a third embodiment of the LED fluorescent lamp according to the present invention.

9 is a circuit diagram showing a fourth embodiment of the LED fluorescent lamp according to the present invention.

10 is a circuit diagram showing a fifth embodiment of the LED fluorescent lamp according to the present invention.

11 is a circuit diagram showing a sixth embodiment of the LED fluorescent lamp according to the present invention.

Fig. 12 is a diagram showing the circuit configuration when the LED fluorescent lamp according to the first embodiment of the present invention is used for a fluorescent lamp ballast of a half bridge system.

Fig. 13 is a diagram showing the circuit configuration when the LED fluorescent lamp according to the third embodiment of the present invention is used for an electronic fluorescent ballast of an instant-start system.

Fig. 14 is a circuit configuration when the LED fluorescent lamp according to the fourth embodiment of the present invention is applied to an instant type electronic ballast.

Fig. 15 is a circuit diagram in which an LED fluorescent lamp according to a fifth embodiment of the present invention is connected to an electronic ballast of a series resonance method.

16 is a timing diagram of a current flowing in the LED array unit.

Fig. 17 is a circuit configuration diagram when the LED fluorescent lamp according to the second embodiment of the present invention is attached to a magnetic ballast of a general commercial power supply.

18 is a diagram illustrating a circuit configuration when a general commercial AC power supply is directly connected to the LED fluorescent lamp 1000.

1000: LED fluorescent lamp 100: LED driving circuit

110: light emitting diode array unit 120: constant current control unit

200: first external connection circuit portion 300: second external connection circuit portion

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the present specification and claims should not be construed as being limited to the common or dictionary meanings, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that it can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

Referring to FIG. 1, the LED driving circuit 100 according to the present invention includes a light emitting diode array 110 in which a plurality of light emitting diodes are connected in series or in parallel, and a constant current controller in which the light emitting diode array is connected to an output port ( 120, and a first capacitive element C1 connected to the input port of the constant current controller. Optionally, as shown in FIG. 1, a first current control diode D1 or a second current control diode D2 may be further included.

In the light emitting diode array unit 110, a plurality of light emitting diodes are connected in series, and one light emitting diode array unit in which a plurality of light emitting diodes are connected in series is connected to one or more light emitting diode array units in parallel. Also includes. A light emitting diode (LED) emits light having a wavelength corresponding to an energy level reduced by recombination of holes and electrons in the light emitting layer. Furthermore, in the present specification, a combination of a plurality of light emitting diodes connected in series and parallel in various arrangement structures is defined as the light emitting diode array unit 110.

In the first embodiment, the light emitting diode array unit 110 is illustrated in which three light emitting diodes are connected in series. However, this is only for convenience of description and the present invention is not limited thereto. The present invention can be changed and modified as many as the structure and size of the fluorescent lamp in which the LED driving circuit 100 is mounted.

A first capacitive element C1 is connected to an input port of the constant current controller 120, and the constant current controller is configured to connect the electric energy stored in the first capacitive element C1 to the constant current controller as a load. The constant current may be supplied to the array unit 110.

In the first embodiment, the current flowing through the light emitting diode array unit 110 is controlled through the constant current controller 120, so that the power consumption and the applied voltage of the LED fluorescent lamp may change according to the difference in the ballast used externally. The change in power consumption of the LED fluorescent lamp at the time, and the change in power consumption in the LED lamp when the previous magnetic ballast is used can be compensated. The constant current controller 120 will be described in more detail later with reference to FIGS. 2 and 3.

The first current control diode D1 may be connected to one side of the constant current controller 120, or the second current control diode D2 may be connected to the other side of the constant current controller 120. The first current control diode D1 and the second current control diode D2 may be connected in a forward direction to charge the first capacitive element C1 having polarity.

A first capacitive element C1 may be connected in parallel to an input port of the constant current controller. The first capacitive element C1 may serve as an energy tank. That is, after storing various types of power energy applied from general commercial power source (50Hz / 100V, 60Hz / 220V), high frequency electronic ballast or low frequency magnetic ballast applied from the outside, main power is supplied to the LED array. It can serve as an energy tank to supply.

The light emitting diode driving circuit 100 according to the second embodiment has a structure similar to that of the light emitting diode driving circuit 100 according to the first embodiment shown in FIG. 1.

A buck converter of the type used in this embodiment may be schematically illustrated as shown in FIG. That is, the buck converter used in this embodiment is a direct current power source, one inductor (L), one transistor switch (SW), one diode (D), one capacitor (C) and one resistor (R). It can be a simple structure that is composed. Here, the LED array is placed with one resistor (R) to simplify the schematic.

Looking at the basic operation, when the transistor switch (S) is turned on (on), the charge of the DC power supply (+) power terminal → inductor (L) → resistance (R) and capacitor (C) → (-) power terminal Current flows through the path to primarily store energy from the input power source in the inductor (L). Here, during the on period of the switch S, V _D = V _i , V _L = V _i -V _o . At this time, the diode is biased in the reverse direction so that no current flows.

During the section in which the transistor switch S is off, the energy stored in the inductor L during the on section of the switch S is applied to the resistor R as a load. You can operate continuously as you do. At this time, during the off period of the switch (S), V _D = 0, V _L =-V _o . That is, energy stored in the inductor L is supplied to the resistor R in the forward direction of the diode.

The buck converter has two types of operation modes, continuous mode and discontinuous mode, depending on whether the current value of the inductor L falls to zero. A dead band where the current flowing through the inductor L becomes zero during some period of switching because the amount of power required is 20-30 watts, which is sufficiently smaller than the amount that can be delivered during the entire conversion period of the switching. ) Exists. During this dead band, V _D = V _o and V _L = 0.

The basic operation of the converter in such an intermittent mode will be described below.

In the present embodiment, assuming that the converter operates in a steady state, the energy inside the inductor L has the same value at the beginning and the end of the switching period, and becomes zero in the intermittent mode.

This means that the average voltage value of the inductor voltage V _L (V _L is a line shown in red) is 0, that is, the area of the square of the on section of the switch S shown in the voltage of FIG. It means that the area of the off period is the same, which can be represented by the following equation.

Equation 1

Where Vi is an input voltage, Vo is an output voltage, D is a duty cycle, and T is a cycle.

Equation 2

When the value of δ is obtained from Equation 1

Equation 3

For simplicity, the current flowing through the light emitting diode array portion as a load has a constant current characteristic when a capacitor large enough to maintain a constant voltage during the switching period is connected in parallel. This means that the average value of the current flowing through the capacitor is zero.

Equation 4

here,

Denotes an average value of the inductor (L) current.

As shown in (b) of FIG. 3, the waveform of the inductor current represents the shape of a triangular wave.

Equation 5

Same as

The inductor current is zero at the starting point and rises up to I _Lmax during the Ton interval.

Equation 6

It can be expressed as

Substituting Equation 6 into Equation 5,

Equation 7

Can be expressed as

Substituting Equation 7 into Equation 3, the output voltage Vo is

Equation 8

In the case of the intermittent mode converter from Equation 8, the output voltage Vo is not only an input voltage Vi and a duty cycle D, but also an inductance, a cyclic period T, and an output current of the inductor L. You can see that it is a function of (Io).

Referring to FIG. 2, the light emitting diode driving circuit 100 is similar to the light emitting diode driving circuit 100 according to the first embodiment shown in FIG. 1. One capacitive element C1 may be included. The constant current controller 120 includes a driving IC 121, a diode D3, a power MOSFET (MFET), resistors R1 and R2, and an inductor L1. Optionally, the LED driving circuit 100 may further include a first current control diode D1 or a second current control diode D2.

As in the first embodiment, the driving IC 121 is connected to the first capacitive element C1 in parallel and uses the electric energy stored in the first capacitive element C1 as a constant current to the light emitting diode array unit (LED array). The first current control diode D1 and the second current control diode D2 are connected to one side and the other side of the constant current controller 120 to supply stabilized power.

The driving IC 121 includes an input terminal V _IN , a gate terminal GATE, a ground terminal GND, a V _DD terminal, an LD terminal, a CS terminal, an RT terminal, and a PWM_D terminal. The voltage of the first capacitive element C1 is applied through the input terminal V _IN and the ground terminal GND to start the oscillation operation at a preset frequency by the RT terminal grounded through the resistor R1. The terminal (GATE) is connected to the gate of the power MOSFET to control the switching operation of the power MOSFET.

Here, the drain side of the power MOSFET is connected to the cathode side of the light emitting diode array unit 110 via an inductor L1 for storing switching energy when the power MOSFET is on, and the CS terminal is connected to the power MOSFET. It is connected to the source side and serves to sense the current characteristics of the light emitting diode array 110 obtained through the resistor (R2).

The basic configuration of the present embodiment is a buck converter based on fly back mode operation, and an anode of the diode D3 is connected to the drain side of the power MOSFET, and the diode is turned on through the diode D3. The energy stored in the inductor L1 in the) section is a current flowing through the path of the inductor L1 → diode D3 → light emitting diode array unit 110 during the off period of the power MOSFET.

In the basic operation of the driving IC 121, when a voltage applied to V _DD of the driving IC 121 exceeds an under voltage lock operation (UVLO), a gate driving signal is output from the driving IC 121, and the output current is power. This is controlled by limiting the peak of the current flowing through the MOSFET. In order to sense the current of the power MOSFET, a current sense resistor (R2) is connected between the source terminal of the power MOSFET and ground, and the voltage obtained from the current sense resistor (R2) is connected to the current sense (CS) pin of the driving IC 121. When the voltage of this current sense pin is exceeded the threshold of peak current sense voltage, the gate drive signal of the power MOSFET is terminated and the power MOSFET is turned off. The threshold may be different depending on the characteristics of each driver IC, and may be preset internally or programmed by applying a voltage to the control pin LD of the driver IC.

Here, the buck converter control method is a pulse width modulation (PWM) control method of changing the duty cycle of the clock pulse of a fixed frequency to maintain a constant output voltage, by changing the clock period having a fixed pulse width Pulse Frequency Modulation (PFM) control to keep the output voltage constant, or Variable Frequency Modulation (VFM) to keep the output voltage constant by controlling the clock output by a fixed field according to the output voltage error Frequency Modulation) may be applied.

Referring to FIG. 4, the voltage waveform a of the CS terminal of the driving IC 121, the current waveform b flowing through the LED array, and the drain voltage waveform c of the MOSFET are shown.

The circuit configuration of the light emitting diode driving circuit of FIG. 2 takes the configuration of the buck converter of FIG. 3 described above. Therefore, the current graph I _L of the inductor L of FIG. 3B and the current waveforms of the LED array 110 of FIG. 4 exhibit the same triangular wave shape. You can check it.

While the power MOSFET (MFET) is On, it can be seen that the current of the LED array 110 and the voltage of the CS terminal of the driving IC 121 are increased. When the voltage of the CS terminal increases and exceeds the threshold of the peak current sense voltage, the gate driving signal of the power MOSFET (MFET) is terminated to turn off the power MOSFET (MFET). When the power MOSFET (MFET) is turned off, it can be seen that the voltage at the CS terminal of the driving IC 121 becomes O equal to the ground.

In addition, when the power MOSFET (MFET) is turned on, the voltage of the first capacitive element C1 is applied so that the LED array → inductor L1 → power MOSFET (MFET) → Current flows through the path of the resistor R2 to ground to primarily store energy from the voltage between both ends of the first capacitive element in the inductor L1.

Then, when the power MOSFET (MFET) is off (Off), it can operate continuously as in the transfer of this energy to the light emitting diode array (LED array) 110 as a load.

1 and 2 illustrate two types of light emitting diode driving circuits 100. However, this is only an example of the present invention, but is not limited thereto. More specifically, a light emitting diode array unit 110 in which a plurality of light emitting diodes are connected in series, or a light emitting diode array unit 110 in which a plurality of light emitting diode array parts in which a plurality of light emitting diodes are connected in series is coupled in parallel, such a light emitting diode If the array unit 110 includes a constant current controller 120 connected to an output port and a first capacitive element C1 connected to an input port of the constant current controller 120, all of the light emitting diode driving circuits will be described. It is included in 100.

5, the internal structure of the drive IC 121 of the light emitting diode drive circuit 100 shown in FIG. 2 will be described. As illustrated, the driving IC 121 includes an input terminal V _IN , a gate terminal GATE, a ground terminal GND, a V _DD terminal, an LD terminal, a CS terminal, an RT terminal, and a PWM_D terminal.

Looking at the internal configuration of the driving IC 121, one constant voltage regulator (Reg), two comparator (CM), one OR gate, one RS flip-flop, one AND gate, and one internal Oscillator (OSC).

The constant voltage regulator (Reg) is connected to the V _IN terminal to receive a high voltage from the outside to create a stabilized power supply for driving the drive IC (121), the two comparison operators (CM) are arranged in parallel with each other The positive terminal of the input side of the terminal is connected to the CS terminal, and a predetermined voltage (for example, 250 mV) is internally applied to the negative terminal of one of the two differential amplifiers (CM), and the other differential amplifier ( The negative terminal of the CM side is connected to a linear dimming terminal. In addition, the outputs of the two comparators are connected to the input side of the OR gate, which is connected to the reset terminal of the RS flip-flop and from the internal oscillator to the Set terminal of the RS flip-flop. Is applied. The output terminal (Q) of the RS flip-flop is applied to the input of the AND gate together with the PWM dimming (PWM-D) signal so that the current value flowing through the power MOSFET (MFET) during the period in which the PWM dimming signal is on is turned on. If the value is less than or equal to the preset value, the power MOSFET is turned on. If the value exceeds this value, the power MOSFET is turned off to drive the LED array unit 110 with a predetermined constant current characteristic.

Hereinafter, the LED fluorescent lamp 1000 including the light emitting diode driving circuit 100 described with reference to FIGS. 1 to 5 will be described.

Here, a circuit diagram of the LED fluorescent lamp 1000 including the light emitting diode driving circuit unit 100 shown in FIGS. 1 to 5 is illustrated. In FIGS. 1 to 5, the light emitting diode driving circuit 100 is represented, but since some components of the LED fluorescent lamp 1000 are described below, the light emitting diode driving circuit unit 100 is represented. Since the light emitting diode driving circuit 100 and the light emitting diode driving circuit unit 100 correspond to the same circuit, the same reference numerals are denoted. That is, the internal configuration of the LED driving circuit unit 100 is as described above with reference to FIGS. 1 to 5.

Referring to FIG. 6, the LED fluorescent lamp 1000 according to the first embodiment of the present invention includes a light emitting diode driving circuit unit 100, a first external connection circuit unit 200, a second external connection circuit unit 300, and a first And second current control diodes D8 and D9 and first to fourth path control diodes D10 to D13. Here, the first and second current control diodes D8 and D9 may be the same diodes as the first current control diode D1 and the second current control diode D2 described above.

Since the light emitting diode driving circuit unit 100 has the same configuration as the light emitting diode driving circuit 100 shown in Figs. 1 and 2, its detailed description is omitted here.

The first external connection circuit unit 200 is connected to one end of the LED driving circuit unit 100, and supplies a voltage to the LED driving circuit unit 100. The first external connection circuit unit 200 is connected in series between at least one external connection pin (P1, P2), the first and second external connection pins (P1, P2) and the light emitting diode driving circuit unit 100 that are supplied with voltage. At least one capacitor (C3, C4) (second capacitive element, third capacitive element) connected to the.

In addition, the first external connection circuit unit 200 further includes at least one diode D4 and D5 (first diode and second diode) connected to the first and second external connection pins P1 and P2. The first and second diodes D4 and D5 are connected in series between the first and second external connection pins P1 and P2 and the LED driving circuit unit 100, and the second capacitive element and the third capacitive element are connected. The elements C3 and C4 are connected in parallel.

In addition, the first external connection circuit unit 200 includes at least one resistor R3 and R4 (first) connected in series between the first and second external connection pins P1 and P2 and the LED driving circuit unit 100. Resistor and a second resistor) may be further included. In this embodiment, the first and second resistors R3 and R4 are connected in parallel with the second and third capacitive elements C3 and C4 and the first and second diodes D4 and D5. In this case, the first and second resistors R3 and R4 are for supplying current for initial trigger driving of an inverter (not shown) of the electronic ballast.

The second external connection circuit unit 300 is connected to the other end of the LED driving circuit unit 100, and supplies a voltage to the LED driving circuit unit 100 similarly to the first external connection circuit unit 200. The second external connection circuit unit 300 includes at least one external connection pin (P3, P4) (third external connection pin, and fourth external connection pin), the third and fourth external connection pin (P3, P4) and at least one capacitor (C5, C6) (fourth and fifth capacitive elements) connected in series between the LED driving circuit unit 100.

Each of the second to fifth capacitive elements may be connected to various types of fluorescent ballast circuits through at least one of the first to fourth connecting pins, and the impedance in the fluorescent ballast circuit according to the frequency change may be adjusted. By changing the current flowing through the LED array portion can be controlled can be used without changing the existing ballast for fluorescent lamps.

In addition, the second external connection circuit unit 300 further includes at least one diode D6 and D7 (third diode and fourth diode) connected to the third and fourth external connection pins P3 and P4. The third and fourth diodes D6 and D7 are connected in series between the third and fourth external connection pins P3 and P4 and the LED driving circuit unit 100, and the fourth and fifth capacitive elements C5 are connected in series. , C6).

In addition, the second external connection circuit unit 300 includes at least one resistor (R5, R6) (third connected in series between the third and fourth external connection pins P3 and P4 and the LED driving circuit unit 100. Resistor and a fourth resistor) may be further included. However, the third and fourth resistors R5 and R6 are connected in parallel with the fourth and fifth capacitive elements C5 and C6 and the third and fourth diodes D6 and D7. The third and fourth resistors R5 and R6 are for supplying current for initial trigger driving of the inverter of the electronic ballast.

The first and second current control diodes D8 and D9 and the first to fourth path control diodes D10 to D13 are further disposed between the first external connection circuit unit 200 and the second external connection circuit unit 300. May be included.

The first and second current control diodes D8 and D9 are disposed between the LED driving circuit unit 100 and the first external connection circuit unit 200 or between the LED driving circuit unit 100 and the second external connection circuit unit 300. It is connected in series, and serves to control the current to flow in the forward direction in the LED driving circuit unit 100. In the present exemplary embodiment, the first and second current control diodes D8 and D9 are connected to both ends of the light emitting diode driving circuit unit 100, but in some cases, the first and second current control diodes D8, Only one current control diode of D9) may be included.

The first to fourth path control diodes D10 to D13 are connected in parallel with the LED driving circuit unit 100 between the first external connection circuit unit 200 and the second external connection circuit unit 300. The first and second diodes D4 and D5 of the connection circuit unit 200 are connected in the reverse direction. The first to fourth path control diodes D10 to D13 are nonpolar regardless of the phase change of the AC voltage which may occur depending on the type of fluorescent ballast mounted when the LED fluorescent lamp 1000 is mounted to the fluorescent ballast. It also plays a role in enabling symmetrical operation.

A circuit diagram of the LED fluorescent lamp 1000 according to the second embodiment shown in FIG. 7 has a configuration similar to that of the LED fluorescent lamp 1000 according to the first embodiment shown in FIG. 6. Therefore, the same reference numerals are used for the same configuration, and the description of the same configuration is omitted.

As shown, the LED fluorescent lamp 1000 according to the present embodiment is a light emitting diode driving circuit 100, a first external connection circuit 200, a second external connection circuit 300, the first and second current control Diodes D8 and D9 and first to fourth path control diodes D10 to D13. Here, the first and second current control diodes D8 and D9 may be the same diodes as the first current control diode D1 and the second current control diode D2 described above.

However, the first external connection circuit unit 200 may include first and second external connection pins P1 and P2, second and third capacitive elements C3 and C4, and first and second diodes D4 and D5. ) Only. That is, the first external connection circuit unit 200 in the present embodiment does not include the first and second resistors R3 and R4 as compared with the first embodiment.

The second external connection circuit part 300 also includes only the third and fourth external connection pins P3 and P4, the fourth and fifth capacitive elements C5 and C6, and the third and fourth diodes D6 and D7. Include. The 2nd external connection circuit part 300 in this embodiment is the structure which does not contain the 3rd and 4th resistors R5 and R6 contained in the 2nd external connection circuit part 300 in 1st Embodiment.

As mentioned above, the first to fourth resistors R3 to R6 are for supplying a current for the initial trigger driving of the inverter of the electronic ballast, and a series resonance method in which the initial trigger operation of the ballast is made through a filament of the fluorescent lamp. Except for the half-bridge type electronic ballast, the circuit configuration of the fluorescent lamp 1000 can be configured even without including the first to fourth resistors R3 to R6.

A circuit diagram of the LED fluorescent lamp 1000 according to the third embodiment will be described with reference to FIG. 8. The LED fluorescent lamp 1000 according to the present embodiment has a configuration similar to the circuit diagram of the fluorescent lamp 1000 according to the second embodiment shown in FIG. 7, and there are differences in circuit configuration in some parts.

As illustrated, the LED fluorescent lamp 1000 according to the present embodiment includes a light emitting diode driving circuit unit 100, a first external connection circuit unit 200, a second external connection circuit unit 300, and first and second current control. Diodes D8 and D9 and first to fourth path control diodes D14 to D17. Here, the first and second current control diodes D8 and D9 may be the same diodes as the first current control diode D1 and the second current control diode D2 described above.

However, the second and third capacitive elements C3 'and C4' and the first and second diodes D4 'and D5' in the first external connection circuit 200 are connected to each other in series, and the second The fourth and fifth capacitive elements C5 'and C6' and the third and fourth diodes D6 'and D7' in the external connection circuit unit 300 are connected in series with each other.

As the second and third capacitive elements C3 'and C4' and the first and second diodes D4 'and D5' in the first external connection circuit 200 are connected in series with each other, the first and second capacitive elements C3 'and C4' are connected in series. The connection positions of the cathode side and the anode side of the second path control diodes D14 and D15 may be changed.

More specifically, the cathode side of the first path control diode D14 is connected between the second capacitive element C3 'and the first diode D4' of the first external connection circuit 200, and the anode side is the second side. It is connected to the anode side of the third diode D6 ′ of the external connection circuit unit 300.

In addition, the cathode side of the second path control diode D15 is connected to the cathode side of the first diode D4 ′ of the first external connection circuitry 200, and the anode side is a third diode of the second external connection circuitry 300. Is connected between D6 'and the third capacitive element C5'.

In addition, the cathode side of the third path control diode D16 is connected to the cathode side of the second diode D5 ′ of the first external connection circuit portion 200, and the anode side is the fourth diode of the second external connection circuit portion 300. And a fourth capacitive element C6 '.

In addition, the cathode side of the fourth path control diode D17 is connected between the second capacitive element C4 'and the second diode D5' of the first external connection circuit 200, and the anode side is connected to the second external connection. It is connected to the anode side of the fourth diode D7 ′ of the circuit unit 300.

A circuit diagram of the LED fluorescent lamp 1000 according to the fourth embodiment will be described with reference to FIG. 9. The fluorescent lamp 1000 according to the present embodiment has a configuration similar to the circuit diagram of the fluorescent lamp 1000 according to the second embodiment shown in FIG. 7, but there are differences in some configurations.

The first external connection circuitry 200 includes second and third capacitive elements C3 and C4 and first and second diodes D4 and D5 connected in parallel to each other, and the second external connection circuitry 300 ) Includes fourth and fifth capacitive elements C5 and C6 and third and fourth diodes D6 and D7 connected in parallel with each other. In addition, the first and second current control diodes D8 and D9, which are current control diodes, are included between the first external connection circuit unit 200 and the second external connection circuit unit 300.

The LED fluorescent lamp 1000 according to the present embodiment includes first and second path control diodes D18 and D19. However, the connection structures of the first and second path control diodes D18 and D19 in the present embodiment are different from the path control diodes D10 to D13 in the second embodiment.

The first path control diode D18 has a cathode side connected to the cathode side of the first current control diode D8, and the anode side has a cathode side and a third side of the third diode D6 ′ of the second external connection circuit 300. 4 is connected to the capacitive element (C5). In addition, the second path control diode D19 has a cathode side connected to the cathode side and the third capacitive element C4 of the second diode D5 of the first external connection circuit 200, and the anode side has a second current. It is connected to the anode side of the control diode D9. In the LED fluorescent lamp 1000 according to the present exemplary embodiment, the path control diodes D18 and D19 may emit LED fluorescent light regardless of the phase change of the voltage applied to the first to fourth connection pins P1 to P4 in various fluorescent ballasts. Allow the lamp to work. In addition, all of the first to fourth diodes D4, D5, D6, and D7 connected in parallel to the second to fifth capacitive elements C3 to C6, respectively, only have a path through which current flows. Only this is different and the basic operation may be the same as described above.

Unlike ordinary fluorescent lamps, LED fluorescent lamps appear to be normal loads from the beginning of inverter operation. When this is simplified to resistance and set to R, the load characteristics are shown in which the load resistance R is connected in parallel to the capacitor C built in the inverter. If the complex admittance of this parallel load is set to Yrc, Yrc can be expressed as follows.

Equation 9

If we put the complex impedance of Yrc as Zrc, Zrc can be expressed as a function of R and C as

Equation 10

A circuit diagram of the LED fluorescent lamp 1000 according to the fifth embodiment will be described with reference to FIG. 10. The LED fluorescent lamp 1000 according to the present embodiment has a configuration similar to the circuit diagram of the fluorescent lamp 1000 according to the second embodiment shown in FIG. 7, but the configuration on some circuits is different. As shown in FIG. 10, the points on the four circuits will be referred to as first through fourth nodes (nodes 1 through node 4).

The first external connection circuitry 200 includes second and third capacitive elements C3 and C4 and first and second diodes D8 and D9 connected in parallel to each other, and the second external connection circuitry 300 ) Includes fourth and fifth capacitive elements C5 and C6 and third and fourth diodes D10 and D11 connected in parallel with each other. However, it is a configuration including a control diode exhibiting a different role and operation than the first and second current control diodes D8 and D9 included in the fluorescent lamp 1000 according to the second embodiment.

In more detail, the LED fluorescent lamp 1000 according to the present embodiment includes first to fourth current control diodes D24 to D27. The anode of the first current control diode D24 is connected to the other end of the second capacitive element C3 (ie, node 1), and the cathode thereof is connected to the anode side of the light emitting diode driving circuit unit 100. In the case of the second current control diode D25, the anode is connected to the cathode side of the light emitting diode driving circuit unit 100, and the cathode is connected to the other end of the third capacitive element C4 (that is, node 2). In the case of the third current control diode D27, the anode is connected to the cathode side of the light emitting diode driving circuit section 100, and the cathode is connected to the other end (node 3) of the fourth capacitive element C5. In the case of the fourth current control diode D26, the anode is connected to the other end of the fifth capacitive element C6 (that is, node 4), and the cathode thereof is connected to the anode side of the light emitting diode driving circuit unit 100.

In addition, in the case of the first diode D8, the anode is connected to the first external connection pin P1, and the cathode is connected to the anode of the first current control diode D24. In the case of the second diode D9, the anode is connected to the cathode of the second current control diode D25, and the cathode is connected to the second external connection pin P2. In the case of the third diode D10, the anode is connected to the cathode of the third current control diode D27, and the cathode is connected to the third external connection pin P3. In the case of the fourth diode D11, its anode is connected to the fourth external connection pin P4, and its cathode is connected to the anode of the fourth current control diode D26.

Referring to the path control diode, in the case of the first path control diode D20, its cathode is connected to the first external connection pin P1, and its anode is the cathode of the third current control diode D27 (ie, node 3). ) In the case of the second path control diode D21, its cathode is connected to the anode (ie, node 1) of the first current control diode D24, and the anode is connected to the third external connection pin P3. In the case of the third path control diode D22, its cathode is connected to the fourth external connection pin P4 and its anode is connected to the cathode of the second current control diode D25 (ie node 2). In the case of the fourth path control diode D23, the cathode is connected to the anode (ie, node 4) of the fourth current control diode D26, and the anode is connected to the second external connection pin P2.

A circuit diagram of the LED fluorescent lamp 1000 according to the sixth embodiment will be described with reference to FIG. 11. The fluorescent lamp 1000 according to the present embodiment has a configuration similar to the circuit diagram of the fluorescent lamp 1000 according to the third embodiment shown in FIG. 8, but there are differences in some configurations.

The first external connection circuit unit 200 includes second and third capacitive elements C3 'and C4' and first and second diodes D4 'and D5' connected in series with each other, and the second external The connection circuit unit 300 includes fourth and fifth capacitive elements C5 'and C6' and third and fourth diodes D6 'and D7' connected in series with each other. In addition, the first and second current control diodes D8 and D9 are included between the first external connection circuit unit 200 and the second external connection circuit unit 300.

The LED fluorescent lamp 1000 according to the present embodiment includes first and second path control diodes D28 and D29, and third and fourth path control diodes D30 and D31. Here, in the case of the first path control diode D28, the anode is connected to the cathode side of the LED driving circuit unit 100, and the cathode is connected to the anode of the first diode D4 '. In the case of the second path control diode D29, the anode is connected to the cathode of the third diode D6 ′, and the cathode is connected to the anode side of the LED driving circuit unit 100. In the case of the third path control diode D30, the anode is connected to the cathode of the fourth diode D7 ′, and the cathode is connected to the anode side of the LED driving circuit unit 100. In the case of the fourth path control diode D31, the anode is connected to the cathode side of the LED driving circuit unit 100 and the cathode is connected to the anode of the second diode D5 '.

6 to 11 illustrate circuit diagrams of various modified fluorescent lamps 1000. As shown, the circuit diagram of the LED fluorescent lamp 1000 can be variously modified. In addition, in this embodiment, the state in which each of the 1st external connection circuit part 200 and the 2nd external connection circuit part 300 is equipped with a pair of external connection pin was illustrated. However, this is also not limited to this. The external connection pins provided in the first external connection circuit unit 200 and the second external connection circuit unit 300 may be configured differently according to the type of electronic ballast in which the fluorescent lamp 1000 is mounted.

In addition, the fluorescent lamp 1000 illustrated in FIGS. 6 to 11 is mounted and used in various ballasts through the first to fourth external connection pins P1 to P4. At this time, the electronic ballast in which the fluorescent lamp 1000 according to the present embodiment is mounted is a half bridge method, an instant start method, a program start method, a starter lamp method, and It may be any one of a rapid start ballast.

The half-bridge fluorescent ballast is composed of a series resonant circuit consisting of an inductor and a capacitor at the switching output point of a half-bridge inverter composed of switching elements, initially turns on the fluorescent lamp with a series resonance voltage across the capacitor, and once the fluorescent lamp is turned on. The stabilization current flowing through the fluorescent lamp is controlled by the inductor of the series resonance circuit.

When power is applied, current flows through the resistor (R7) → resistor (R4) → resistor (R3) → ballast internal resistance (R8) → resistor (R5) → resistor (R6) → capacitor (C3). Is charged, and when this value exceeds the starting threshold voltage of the DIAC, the switching transistor Q62 is initially driven.

When the switching transistor Q61 is turned on and the potential at the point A becomes Vs, the resonant current flows in the path of the inductor Lo-> C4-> C3-> C2-> C5-> D6-> 2Co. When A) is on, point A becomes the ground potential and current flows in the opposite direction. Since the LED fluorescent lamp 140 should be symmetrical for versatility, the capacitors C3 to C6 inside the LED fluorescent lamp 140 should be set to C4 because they should not have polarity according to the connection pins of the LED fluorescent lamp 140. The value of the composite capacitor Ca formed in series of C3-C2-C5 can be expressed as follows.

Equation 11

Here, in the case of C4 << C2, the value of the capacitor may be represented by Ca = C4 / 2, and the impedance (Z) value is increased by Equation 1, and the current flowing in the LED fluorescent lamp 140 decreases accordingly. The current can be arbitrarily controlled by changing the value of the capacitor C4.

Referring to FIG. 13, the instant start type electronic fluorescent ballast is configured such that Q71 and Q72 of the switching element continue the switching operation by a self-oscillation operation of a circuit composed of transformers T1 and T2 and a capacitor C12. Connect the output of (A) to the point (B), which is the midpoint of the capacitor C12 connected in series, short in AC and 1/2 Vcc in DC, to the primary winding T2-1 of transformer T2. The fluorescent lamp is initially discharged with a high voltage induced in the secondary winding T2-2 of T2, and once discharge is performed, the stabilization lamp current is controlled by a capacitor C13 connected in series with the lamp load.

When using the ballast according to the present embodiment, looking at the basic operation when the output line of the electronic ballast is connected to the first external connection pin (P1) and the third external connection pin (P3), the transformer T2-1 itself When oscillation induces high-frequency AC voltage to secondary winding T2-2 and (C) is the (+) potential with respect to (D), (C) → C13 → C3 '→ D4' → D8 → Light emitting diode driving circuit section 100 → D9 → D6 '→ C5' → Current flows through the path of point (D), and point (D) → C5 '→ D15 → D8 → a current flows through the path of the LED driving circuit unit 100 D9 D14 C3 'C13 C13 (C).

Therefore, the current value flowing in the LED driving circuit portion is controlled by the series complex impedance of the capacitors C13 and C3 'and C5' contained in the electronic ballast, and the LED is driven by changing the values of C3 'and C5'. The current flowing in the circuit portion can be controlled.

At this time, if the value of the capacitors C3 '-C6' is set to C2, the composite impedance Z of the capacitor can be expressed as follows.

Equation 12

The second connection pin P2 and the fourth connection pin P4 are terminals for symmetry, and the basic operation is the same as the case where the output line of the electronic ballast is connected to the connection pin P1 and the connection pin P3.

According to the present embodiment, looking at the basic operation when the output line of the electronic ballast is connected to the first connecting pin (P1) and the third connecting pin (P3), the transformer T2-1 is a secondary winding T2 by the self oscillation When a high-frequency AC voltage is induced at -2 and (C) is a positive potential with respect to (D), (C) → C1 → D4 → D8 → LED driving circuit section 100 → D9 → (D) → D6 → D18 → LED drive circuit section 100 → D19 → C3 → C1 → (C The current flows through the path of the dot.

Therefore, the current value flowing in the LED driving circuit portion is controlled by the series complex impedance of the capacitors C1 and C41 and C44 contained in the electronic ballast, and the current flowing in the LED driving circuit portion by changing the values of C41 and C44. Can be controlled.

At this time, if the value of the capacitors C3-C6 is set to C2, the composite impedance Z of this capacitor can be expressed as follows.

Equation 13

The second connecting pin P2 and the fourth connecting pin P4 are terminals for symmetry, and the basic operation is when the output line of the electronic ballast is connected to the first connecting pin P1 and the third connecting pin P3. Is the same as

Although the above description is applied to the half-bridge type fluorescent ballast and the instant start type electronic fluorescent ballast, this is only an example of an electronic ballast, but is not limited thereto. The LED fluorescent lamp 1000 may be applied to other electronic ballasts in addition to the electronic ballasts listed above.

Fig. 15 is a circuit diagram in which an LED fluorescent lamp according to a fifth embodiment of the present invention is connected to an electronic ballast.

Disregarding the diode voltage inside the LED fluorescent lamp according to the present embodiment, the potential of the voltage Vc applied to the resonance capacitor C inside the electronic ballast is positive based on the third and fourth connection pins P3 and P4. In a period in which the voltages applied to the first and second connection pins P1 and P2 are positive, the potential of the sine wave voltage rises so that the potential value of the first capacitive element C1 of the light emitting diode circuit part is increased. When it reaches (Vdc), the current is D8 → D24 → LED driving circuit unit 100 → D27 → D10, D8 → D24 → LED driving circuit unit 100 → D25 → D22, D23 → D26 → LED driving circuit unit 100 ) D27 → D10 and D23 → D26 → LED driving circuit unit 100 → D25 → D22 through a plurality of paths, so that the first capacitive element C1 in the LED driving circuit unit 100 may be charged. have. When the voltage decreases again and falls below the potential Vdc of the first capacitive element C1 of the LED driving circuit unit, no current flows in the LED driving circuit unit 100. Therefore, the first capacitive element C1 in the LED driving circuit unit 100 is not charged.

In addition, in a negative period in which a negative voltage is applied to the first and second connection pins P1 and P2, the potential decreases, so that the potential of the first capacitive element C1 of the LED driving circuit unit 100 ( When it becomes lower than Vdc), the current starts to flow again D11 → D26 → LED driving circuit unit 100 → D25 → D9, D11 → D26 → LED driving circuit unit 100 → D27 → D20 → D24 → D24 → A current flows through a plurality of paths of the LED driving circuit unit 100-> D25-> D9, and D21-> D24-> the LED driving circuit unit 100-> D27-> D20. At this time, if the peak value of the voltage applied to the light emitting diode driving circuit is ignored, the maximum value Vm of the applied voltage Vm sin (wt + θ) is applied.

Since the charge and discharge charges of the first capacitive element C1 of the light emitting diode driving circuit are balanced, the average value of the DC voltage value Vdc is stabilized, and this DC voltage value is to be regarded as a voltage source. Therefore, the LED fluorescent lamp is consumed according to the DC voltage value Vdc applied to the first capacitive element C1, the number of LEDs connected in series in the LED array unit 110, and the capacitance values of the capacitors C3-C6. The power can be varied arbitrarily.

16 is a timing diagram of a current flowing in the LED array unit. Referring to FIG. 16,

0-ta section: Capacitors C4 and C6 are charged to ta when the current starts to flow in the LED driving circuit unit 100 through the paths of (C4-D22) and (D23-C6).

ta-tb section: D8 → D24 → light emitting diode driving circuit portion 100 → D27 → D10, D8 → D24 → light emitting diode driving circuit portion 100 → D25 → D22, D23 → D26 → light emitting diode driving circuit portion 100 → D10, and D23 → D26 → light emitting diode driving circuit unit 100 → D25 → D22, and the main current flows through the combined path.

tb-π interval: No main current flows through the LED driving circuit portion 100, and the voltages charged in the capacitors C4 and C6 discharge to the tc interval.

π-tc section: Capacitors C3 and C5 are charged to the time point tc when current flows in the LED driving circuit unit 100 through the paths (D20-C3) and (C5-D21).

tc-td section: D21 → D24 → light emitting diode driving circuit portion 100 → D25 → D9, D11 → D26 → light emitting diode driving circuit portion 100 → D25 → D9, D21 → D24 → light emitting diode driving circuit portion 100 → D20, D11 → D26 → light emitting diode driving circuit unit 100 → D27 → D20 The main current flows through the combined path.

td-2π period: The main current does not flow through the LED driving circuit unit 100, and the voltages charged in the capacitors C3 and C5 discharge to the ta period.

2π-(2π + ta) section: no main current flows through the LED driving circuit unit 100, and capacitors C4 and C6 are connected to the LED driving circuit unit 100 through the paths of (C4-D22) and (D23-C6). It is charged to the value of Vdc until the current flows (2π + ta), and the voltages charged at C3 and C5 are discharged.

Here, a current flowing through the LED driving circuit unit 100 flows substantially to the first capacitive element C1 in the LED driving circuit unit 100 to drive the LED array in the LED driving circuit unit. May be charged in the first capacitive element C1.

Therefore, in the case of the LED fluorescent lamp of the present embodiment, if the value of the built-in capacitors C3 to C6 is set to Ca, the capacitor C built in the inverter in the td-ta and tb-tc sections in which no current flows in the LED array is provided. It operates as if 2Ca are connected in parallel, and the effective capacitance Cr at this time can be expressed as follows.

Equation 14

Therefore, as shown in the above equation, since the characteristic function Q ₀ = 1 / (w ₀ RC) of the series resonant circuit can be expressed, the value of Q ₀ becomes small when the capacitance increases, so that the voltage across the LED fluorescent lamp The value of Vc becomes small, and by changing this Ca value, the maximum value of the current flowing through the LED fluorescent lamp and the section through which the current flows can be controlled, and as a result, the LED power can be controlled.

In the present exemplary embodiment, each of the first external connection circuit unit 200 and the second connection circuit unit 300 includes a pair of external connection pins, but the present invention is not limited thereto. The external connection pins provided in the first external connection circuit unit 200 and the second external connection circuit unit 300 may be configured differently according to the type of the electronic ballast in which the fluorescent lamp 1000 is mounted. The electronic fluorescent ballast and the electronic fluorescent ballast of the instant start method have been described. However, this is only an example of the electronic ballast, but is not limited thereto. The LED fluorescent lamp 1000 according to the present embodiment may be applied to other electronic ballasts in addition to the electronic ballasts listed above.

Referring to FIG. 17, a magnetic ballast L is connected to the second external connection pin P2 of the LED fluorescent lamp, and the magnetic ballast L is connected to one end of an AC power source and the other end of the AC power source. Is connected to the fourth connecting pin (P4). The LED fluorescent lamp 1000 stores the power energy applied from the magnetic ballast L in the first capacitive element C1 of the LED driving circuit unit 100 and then stores the power of the LED driving circuit unit 100. The internal power control set value of the drive IC is configured to supply a constant current to the light emitting diode array.

As a result, the LED fluorescent lamp 1000 according to the present embodiment has the effect of maintaining the electrostatic power characteristic regardless of the characteristics of the magnetic ballast (L). Since the configuration of the remaining LED fluorescent lamp 1000 has already been described above with reference to FIG. 7, the description thereof will be omitted.

In the present embodiment, when the potential of the second external connection pin P2 is (+) based on the fourth external connection pin P4, the current is P2 → D5 → D8 → light emitting diode driving circuit unit 100 → D9 → D7 → P4. When the potential of the second external connection pin P2 is negative, the second external connection pin P2 may flow in the path P4 → D12 → D8 → the LED driving circuit unit 100 → D9 → D13 → P2. Therefore, the value of the current flowing through the light emitting diode driving circuit part can be controlled by the values of C4 and C6.

As shown in FIG. 17, a general commercial AC power source is directly connected to the second external connection pin P2 and the fourth external connection pin P4 to the LED fluorescent lamp 1000. As described above, the LED fluorescent lamp 1000 according to the present embodiment has an advantage that it can be used even if it is directly connected to a general commercial AC power source without the magnetic ballast.

In the present embodiment, when the potential of the second external connection pin P2 is (+) based on the fourth external connection pin P4, the current is P2 → D5 → D8 → light emitting diode driving circuit unit 100 → D9. → D7 → P4. When the potential of the second external connection pin P2 is negative, the second external connection pin P2 may flow in the path P4 → D12 → D8 → the LED driving circuit unit 100 → D9 → D13 → P2. Therefore, the value of the current flowing through the light emitting diode driving circuit part can be controlled by the values of C4 and C6.

As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited thereto and is intended by those skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the equivalent scope of the claims to be described.

Claims

A light emitting diode driving circuit unit including a light emitting diode array unit in which a plurality of light emitting diodes are connected in series or in parallel, a constant current controller connected to an output port of the light emitting diode array unit, and a first capacitive element connected to an input port of the constant current controller. ;

A first external connection circuit unit connected to one end of the light emitting diode driving circuit unit and including at least one external connection pin; And

A second external connection circuit part connected to the other end of the light emitting diode driving circuit and including at least one external connection pin;

LED fluorescent lamp comprising a light emitting diode driving circuit comprising a.
The method of claim 1,

The constant current control unit,

LED fluorescent lamp characterized in that to maintain a constant current input to the light emitting diode array.
The method of claim 2,

Each of the first external connection circuit portion and the second external connection circuit portion,

And at least one capacitive element connected in series between the at least one external connection pin and the light emitting diode driving circuit portion.
The method of claim 3, wherein

The first external connection circuit portion includes a first external connection pin and a second external connection pin,

The second external connection circuit portion, LED fluorescent lamp comprising a third external connection pin and a fourth external connection pin.
The method of claim 4, wherein

The at least one capacitive element,

A second capacitive element having one end connected to the first external connection pin and the other end connected to an anode terminal of the light emitting diode driving circuit;

A third capacitive element having one end connected to the second external connection pin and the other end connected to an anode terminal of the light emitting diode driving circuit;

A fourth capacitive element having one end connected to a cathode terminal of the light emitting diode driving circuit part and the other end connected to the third external connection pin; And

A fifth capacitive element having one end connected to a cathode side terminal of the light emitting diode driving circuit part and the other end connected to the fourth external connection pin;

LED fluorescent lamp comprising a.
The method of claim 5,

At least one current control diode connected in series between at least one of the first external connection circuit portion and the second external connection circuit portion and the light emitting diode driving circuit portion to allow current to flow in the light emitting diode driving circuit portion in a forward direction; LED fluorescent lamp further comprises.
The method of claim 6,

The at least one current control diode,

A first current control diode having a cathode connected to the anode side of the light emitting diode circuit portion and an anode connected to the other ends of the second capacitive element and the third capacitive element; And

A second current control diode having an anode connected to the cathode side of the light emitting diode circuit and a cathode connected to one end of the fourth capacitive element and the fifth capacitive element;

LED fluorescent lamp comprising a.
The method of claim 7, wherein

Each of the first external connection circuit portion and the second external connection circuit portion,

LED fluorescent lamp further comprises first to fourth diodes connected in parallel with the second to fifth capacitive elements, respectively.
The method of claim 8,

The first diode has an anode connected to the first external connection pin and a cathode connected to an anode of the first current control diode,

The second diode has an anode connected to the second external connection pin and a cathode connected to the anode of the first current control diode,

The third diode has a cathode connected to the third external connection pin and an anode connected to the cathode of the second current control diode,

The fourth diode is characterized in that a cathode is connected to the fourth external connection pin and an anode is connected to the cathode of the second current control diode.
The method of claim 9,

A first path control diode having an anode connected to the anode of the third diode and a cathode connected to the first external connection pin;

A second path control diode having an anode connected to the third external connection pin and a cathode connected to the cathode of the first diode;

A third path control diode having an anode connected to the fourth external connection pin and a cathode connected to the cathode of the second diode; And

A fourth path control diode having an anode connected to an anode of the fourth diode and a cathode connected to a second external connection pin;

LED fluorescent lamp further comprises.
The method of claim 10,

A first resistor connected in parallel with said second capacitive element;

A second resistor connected in parallel with said third capacitive element;

A third resistor connected in parallel with the fourth capacitive element; And

A fourth resistor connected in parallel with said fifth capacitive element; LED fluorescent lamp further comprising at least one of.
The method of claim 8,

The first diode has an anode connected to the first external connection pin and a cathode connected to an anode of the first current control diode,

The second diode has an anode connected to the second external connection pin and a cathode connected to the anode of the first current control diode,

The third diode has an anode connected to the third external connection pin and a cathode connected to the cathode of the second current control diode,

And said fourth diode is characterized in that an anode is connected to said fourth external connection pin and a cathode is connected to a cathode of said second current control diode.
The method of claim 12,

A first path control diode having an anode connected to a cathode of the second current control diode and a cathode connected to an anode side of the light emitting diode driving circuit portion; And

A second path control diode having an anode connected to a cathode side of the light emitting diode driving circuit portion and a cathode connected to an anode of the first current control diode

LED fluorescent lamp further comprises.
The method of claim 7, wherein

A first diode having an anode connected to the other end of the second capacitive element and a cathode connected to the anode of the first current control diode;

A second diode having an anode connected to the other end of the third capacitive element and a cathode connected to the anode of the first current control diode;

A third diode having a cathode connected to the other end of the fourth capacitive element and an anode connected to the cathode of the second current control diode; And

A fourth diode having a cathode connected to the other end of the fifth capacitive element and an anode connected to the cathode of the second current control diode;

LED fluorescent lamp further comprises.
The method of claim 14,

A first path control diode having an anode connected to the anode of the third diode and a cathode connected to the anode of the first diode;

A second path control diode having an anode connected to the cathode of the third diode and a cathode connected to the cathode of the first diode;

A third path control diode having an anode connected to the cathode of the fourth diode and a cathode connected to the cathode of the second diode; And

A fourth path control diode having an anode connected to the anode of the fourth diode and a cathode connected to the anode of the second diode;

LED fluorescent lamp further comprises.
The method of claim 14,

A first path control diode having an anode connected to a cathode side of the light emitting diode driving circuit and a cathode connected to an anode of a first diode;

A second path control diode having an anode connected to a cathode of a third diode and a cathode connected to an anode side of the light emitting diode driving circuit;

A third path control diode having an anode connected to a cathode of a fourth diode and a cathode connected to an anode side of the LED driving circuit unit; And

A fourth path control diode having an anode connected to a cathode side of the light emitting diode driving circuit and a cathode connected to an anode of a second diode;

LED fluorescent lamp further comprises.
A light emitting diode driving circuit unit including a light emitting diode array unit in which a plurality of light emitting diodes are connected in series or in parallel, a constant current control unit connected in parallel with the light emitting diode array unit, and a first capacitive element connected in parallel with the light emitting diode array unit;

First to fourth external connection pins;

Second to fifth capacitive elements having one end connected to the first to fourth external connection pins, respectively;

A first current control diode having an anode connected to the other end of the second capacitive element and a cathode connected to an anode side of the light emitting diode driving circuit unit;

A second current control diode having an anode connected to a cathode side of the light emitting diode driving circuit and a cathode connected to the other end of the third capacitive element;

A third current control diode having an anode connected to a cathode side of the light emitting diode driving circuit portion and a cathode connected to the other end of the fourth capacitive element; And

A fourth current control diode having an anode connected to the other end of the fifth capacitive element and a cathode connected to an anode side of the light emitting diode driving circuit unit;

LED fluorescent lamp comprising a.
The method of claim 17,

A first diode having an anode connected to the first external connection pin and a cathode connected to an anode of the first current control diode;

A second diode having an anode connected to the cathode of the second current control diode and a cathode connected to the second external connection pin;

A third diode having an anode connected to the cathode of the third current control diode and a cathode connected to the third external connection pin; And

A fourth diode having an anode connected to the fourth external connection pin and a cathode connected to an anode of the fourth current control diode;

LED fluorescent lamp further comprising.
The method of claim 18,

A first path control diode having a cathode connected to the first external connection pin and an anode connected to a cathode of the third current control diode;

A second path control diode having a cathode connected to an anode of the first current control diode and an anode connected to the third external connection pin;

A third path control diode having a cathode connected to the fourth external connection pin and an anode connected to a cathode of the second current control diode; And

A fourth path control diode having a cathode connected to an anode of the fourth current control diode and an anode connected to the second external connection pin;

LED fluorescent lamp further comprising.