KR100953325B1 - Led lighting apparatus - Google Patents

Abstract

PURPOSE: An LED device is provided to prevent malfunctions or damage to an LED by converting AC power from a ballast into DC power for an LED. CONSTITUTION: First and second power input terminals(311,313) are respectively inserted into a first connection terminal and a second connection terminal of a lighting system for a magnetic or electromagnetic fluorescent lamp. First and second power units(331,333) remove an overvoltage or overcurrent element included in AC power from the first and second power input terminals. A rectifier(335) full-wave rectifies an AC voltage from the first and second power units. A filter unit(339) converts the rectified voltage into DC power. A driving unit(341) turns on a plurality of LEDs.

Description

LED lighting device {LED Lighting Apparatus}

The present invention relates to an LED lighting apparatus that can be used by directly connecting to the fluorescent lamp connection terminal without distinguishing the conventional magnetic or electronic lighting type fluorescent lighting system.

Recently, LED (Light-Emitting Diode) is being used as a new luminaire in place of a filament bulb or a fluorescent lamp, and is in the spotlight.

An LED is a light emitting diode that emits light when a current is applied. The LED can be driven at low voltage, and has a long life, low power consumption, fast response speed and strong impact resistance, and small size and light weight, compared to other lighting devices. LED luminaires are naturally used with a drive circuit that converts commercial AC power into rated DC power for LED operation. There is an attempt to replace the existing fluorescent lamps using such LED lighting device.

Conventional fluorescent lamps are devices that emit electric light by high voltage inside the lamp and the ultraviolet rays generated by the reaction react with fluorescent materials applied to the inner surface of the lamp to emit visible light.

The lighting method of the fluorescent lamp includes a magnetic start method using a separate starter (Glow Starter or Rapid Starter) and a magnetic ballast, and an electronic lighting method using an electronic ballast. Electronic ballast smoothes AC commercial power with DC using electronic components and converts it into high frequency of 20 kHz ~ 30 ㎑ by using high frequency inverter circuit. Electronic ballasts are divided into self-loading and type-loading according to the oscillation method for high frequency. Self-sik is a method using internal inductors and capacitors, so the circuit is simple but somewhat unstable.

1 is a view showing a fluorescent lighting system of the magnetic lighting method, Figure 2 is a view showing a lighting system for fluorescent lighting of the electronic lighting method. The magnetic fluorescent lamp lighting system 100 and the electronic fluorescent lamp lighting system 200 include a first connection terminal 203 and a second connection terminal 205 for connecting a fluorescent lamp.

In the case of the magnetic fluorescent lighting system 100 of FIG. 1, the AC power source forms a closed circuit connected to the magnetic ballast 101, one end of the fluorescent lamp 10, and the other end of the fluorescent lamp 10 via the starter 103. The fluorescent lamp 10 is turned on by the operation of the starter 103. In the case of the electronic lighting type fluorescent lighting system 200 of FIG. 2, the AC power source is configured to connect the first connection terminal 203, the second connection terminal 205, or both terminals 203 and 205 from the electronic ballast 201. It is supplied to the fluorescent lamp 10 through.

Fluorescent lamps used in the fluorescent lamp lighting systems 100 and 200 exemplified, although the power consumption is lower than that of the filament bulb, have a short lifespan and have to be replaced frequently.

However, since the LED is operated by a considerably low DC power supply and is lit in a different way from the fluorescent lamp lighting, a conventional LED lamp cannot be used as it is in a fluorescent lamp system. This is because the ballasts 101 and 201 basically convert a commercial 60 Hz AC power source into a high frequency of several tens of kHz and provide it to the lamp. Furthermore, since the self-ballast does not use a separate integrated circuit chip to control the output, there is an instability in which the output voltage varies from 100V to 1000V depending on the load on the secondary side.

Therefore, if the LED driving circuit is directly connected to the fluorescent lamp connecting terminals 203 and 205 of the fluorescent lighting system 100 and 200 without removing the ballast, the LED driving circuit is connected to the ballast or the like. It will not handle high frequencies or voltages properly, resulting in problems such as the LED lamp not working or being destroyed.

As a result, in order for a general user to use an LED luminaire, it is inconvenient to remove all existing fluorescent lighting devices (eg, ballasts or starters).

Naturally, the LED fluorescent lamp may be adapted to the fluorescent lamp system of the corresponding type by configuring the driving circuit in accordance with a specific fluorescent lamp system (or ballast thereof). The LED fluorescent lamp of this type has a premise that a general user can fully understand and select a lighting method of his or her own fluorescent lamp system and cannot be practically adopted.

In addition, in the self-ballasted ballast system, even if the ballast has the same circuit configuration, its characteristics are different depending on the error of the internal parts, ambient temperature, and lamp conditions. Therefore, a separate circuit tuning process must be performed for each system owned by the user. In other words, it is almost impossible for ordinary users to use LED lighting devices in fluorescent light systems instead of fluorescent lights.

An object of the present invention is to provide an LED lighting device that can be used directly connected to the fluorescent lamp connection terminal without distinguishing the conventional magnetic or electronic lighting type fluorescent lighting system.

Still another object of the present invention is to widen the range of AC voltage that can be processed to a range that can be provided in various conventional fluorescent lighting systems, and by connecting directly to the fluorescent lamp connection terminal without distinguishing a conventional magnetic or electronic lighting method. The present invention provides an LED lighting device that can be used.

In order to achieve the above object, the LED lighting apparatus according to the present invention includes a plurality of LEDs connected in parallel or in series, a first power input terminal, a second power input terminal, a first power supply unit, a second power supply unit, a rectifier, a filter unit, and a driving unit. It includes.

The first power input terminal is provided with a first electrode and a second electrode and is inserted into a first connection terminal of a fluorescent lighting system for magnetic or electronic lighting. The second power input terminal is connected to a third electrode and a fourth electrode. The electrode is inserted into the second connection terminal of the lighting system for fluorescent lamps.

The first power supply unit removes an overvoltage or overcurrent component included in an AC power input from the first power input terminal, and the second power supply unit includes an overvoltage or overcurrent component included in an AC power input from the second power input terminal. Remove it.

The rectifier is full-wave rectified AC voltage output from the first power supply and the second power supply, the filter unit is connected to the output terminal of the rectifier to convert the full-wave rectified voltage from the rectifier to direct current.

The driving unit outputs a voltage and a current rated for the plurality of LEDs from the DC power output from the filter unit to light up the plurality of LEDs.

According to an embodiment, the rectifying unit includes a first rectifying unit provided between the first power supply unit and the output terminal including a bridge diode, and a second rectifying unit provided between the second power supply unit and the output terminal including a bridge diode. . Accordingly, the rectifier propagates AC power input through the first electrode and the second electrode, the third electrode and the fourth electrode, the first electrode and the third electrode, or the second electrode and the fourth electrode. Can be rectified.

According to another embodiment, the lighting device is provided between the first capacitor and the second electrode and connected in series with each other, the first capacitor and the second capacitor, and the third electrode and the fourth electrode provided between the third electrode and connected in series It may further include a third capacitor and a fourth capacitor. In this case, a connection node of the first capacitor and the second capacitor is connected to the high power voltage of the output terminal, and a connection node of the third capacitor and the fourth capacitor is connected to the low power supply voltage of the output terminal to obtain a voltage of the output terminal. It is desirable to limit.

According to another embodiment of the present disclosure, the first power supply unit may further include a resistor provided between the first electrode and the second electrode, and the second power supply unit may further include a resistor provided between the third electrode and the fourth electrode. Can be.

Since the LED lighting apparatus according to the present invention can be used by directly connecting to the fluorescent lamp connection terminal of the conventional fluorescent lighting system instead of the conventional fluorescent lamp, the user has already installed a fluorescent lighting system to replace the fluorescent lamp with the LED lighting device There is no need to remove it.

The LED lighting device of the present invention is not applied to any one of the electronic lighting method or the magnetic lighting method, but for the fluorescent lamp of the magnetic lighting method that can be opened by the starter as well as the electronic lighting method. It operates without any other operation in the lighting system, so that the user does not need to separately apply the lighting method of the lighting system for fluorescent lamps.

LED lighting apparatus of the present invention by effectively treating the high-frequency AC power provided by the ballast of the fluorescent lamp lighting system and converted to the LED direct current power, it is possible to prevent the malfunction and damage of the LED due to the ballast output voltage.

1 is a view showing a lighting system for a fluorescent lamp of the self-illuminating method,
2 is a view showing a lighting system for electronic lighting of fluorescent lamps,
3 is a view showing a lighting system in which the LED lighting apparatus of the present invention is used,
4 is a circuit diagram of an LED lighting apparatus according to an embodiment of the present invention, and
5 is a circuit diagram of the LED lighting apparatus according to another embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail with reference to the drawings.

3, the LED lighting apparatus 300 of the present invention is used in connection with a conventional fluorescent lighting system. The lighting system for fluorescent lamps here includes both a magnetic lighting method using a magnetic ballast and a starter (Glow Starter or Rapid Starter) and an electronic lighting method using an electronic ballast. 3 is an example in which the LED lighting device 300 is connected to the fluorescent lighting system 200 of FIG. 2 using the electronic ballast 201, and will be described below with reference to the example of FIG. 3.

Therefore, the LED lighting apparatus 300 of the present invention includes a first power input terminal 311 and a second power input terminal 313 for receiving AC power from the fluorescent lighting system 100 and 200. The first power input terminal 311 includes a first electrode J1 and a second electrode J2 for connecting to the first connection terminal 203 of the fluorescent lighting system, and the second power input terminal 313. Includes a third electrode J3 and a fourth electrode J4 for connecting to the second connection terminal 205. The first to fourth electrodes J1 to J4 have the form of electrodes exposed in parallel so as to be connected to the fluorescent lamp connection terminals 203 and 205. The LED lighting device 300 of FIG. 3 is illustrated as a straight cylindrical body, but is not limited thereto.

The LED lighting device 300 enables stable operation despite receiving AC power having a higher frequency than commercial AC power through the electronic ballast 201. Furthermore, the LED lighting apparatus 300 may receive and process AC voltages of various intensities provided by the fluorescent lamp systems 100 and 200 without any other manipulation.

Referring to FIG. 4, the LED lighting apparatus 300 of the present invention uses the high frequency AC power of the ballast 201 inputted through the first power input terminal 311 and / or the second power input terminal 313 of the LED. It includes a driving circuit 330 for converting the output to a rated DC voltage for operation, and a plurality of LEDs (LED1, LED2) connected in series or parallel to the output of the driving circuit 330. 4 illustrates two LEDs LED1 and LED2 connected in parallel to the output of the driving circuit 330 on behalf of the plurality of LEDs.

The driving circuit 330 includes a first power supply 331, a second power supply 333, a rectifier 335, a filter 339, and a driver 341.

The first power supply unit 331 receives AC power through the first power input terminal 311, and includes a varistor SVR1 connected in parallel with the fuse FUSE1 connected in series for each terminal, such as an overvoltage or an overcurrent. The circuit of the rear stage is protected from the AC power supply, and the high voltage capacitor CT1 connected in parallel is removed to remove noise included in the AC power supply.

Similarly, the second power supply unit 333 receives AC power through the second power input terminal 313 and includes a barista SVR2 and a high voltage capacitor CT2 connected in parallel with the fuse FUSE2 connected in series. As the first power supply 331 and the second power supply 333, components such as a normal AC-DC converter or a transformer for stepping down at a rated voltage may be used.

The AC power input to the lighting system 300 connected to the fluorescent lighting system of the magnetic or electronic lighting method is as diverse as the types thereof, so that the first electrode J1-the second electrode J2, the third electrode J3 4th electrode J4, 1st electrode J1 3rd electrode J3, 1st electrode J1 4th electrode J4, 2nd electrode J2 3rd electrode J3 Alternatively, the second electrode J2 may be formed through any one of the fourth electrodes J4, and the first electrode J1 may include the second electrode J2 and the third electrode J3, and the fourth electrode J4. It can also be entered through both.

The rectifier 335 includes a first rectifier 336 and a second rectifier 337, and includes a first electrode J1, a second electrode J2, a third electrode J3, a fourth electrode J4, The first electrode J1 and the third electrode J3, the first electrode J1 and the fourth electrode J4, the second electrode J2 and the third electrode J3 or the second electrode J2 and the first electrode The AC power input through the four electrodes J4 is full-wave rectified and output to the filter unit 339 through one common output terminal V1 and ground. In other words, the first rectifying unit 336 and the second rectifying unit 337 are provided as bridge diode combinations D1 to D4 and D11 to D14, respectively, and the output terminals of the first rectifying unit 336 and the second rectifying unit 337 are filters. It is connected in parallel to the input terminal of the unit 339 to form one common output terminal (V1, Ground). Therefore, the rectifier 335 may provide one operating voltage for the LEDs LED1 and LED2 through the common output terminals V1 and Ground, even though AC power is input through any path.

For example, when the LED lighting device 300 is connected to the fluorescent lighting system 100 of FIG. 1, AC power is input through the first electrode J1 and the third electrode J3, and the starter 103 operates. Therefore, the closed circuit through the starter 103 is not formed. In this case, the path of the AC power source passes through the forward diodes D1 and D2 of the first rectifying unit 336, the output terminals V1 and Ground, and the forward diodes D11 and D12 of the second rectifying unit 337. The output terminal (V1, Ground) voltage is the input of the filter unit 339. Therefore, the LED lighting device 300 can operate regardless of whether the starter 103 of FIG. 1 is operated.

In other words, even though the external AC power is input through one of the two electrodes of the first power input terminal 311 and one of the two electrodes of the second power input terminal 313, the first rectifying unit 336 and the first rectifier 336 may be formed. The four diodes included in the two rectifiers 337 form a new combination of bridge diode circuits.

For use in the fluorescent lighting system 100 of FIG. 1, additionally, the bridge diodes D1-D4 of the first rectifying unit 336 and the bridge diodes D11-D14 of the second rectifying unit 337 may be formed. Each of the first power source 331 and the second power source 333 should have a combination of the same shape (diode connection direction, etc.). If different, the first power input terminal 311 is directly connected to the second power input terminal 313 through the first rectifying unit 336 and the second rectifying unit 337, the power supply to the filter unit 339 corresponding to the load This is because there is no supply.

When the AC power is input through the first electrode J1 and the second electrode J2 or through the third electrode J3 and the fourth electrode J4, the first rectifying unit 336 or the second The rectifier 337 outputs the full-wave rectified voltage to the filter unit 339.

The bridge diode combinations D1 to D4 and D11 to D14 preferably use a high frequency diode for processing AC power at a frequency of several hundred times the commercial power output from the ballast 201.

The filter unit 339 smoothes the voltage rectified by the first rectifying unit 336 and the second rectifying unit 337, including a capacitor, to a DC voltage to provide the driving unit 341. In the circuit of FIG. 4, a plurality of electrolytic capacitors C11, C12, and C2 to C4 are connected in parallel in consideration of spatial constraints of the LED lighting device 300. The filter unit 339 is designed to have a time constant sufficient to smooth the high frequency AC power supplied from the ballast 201, so that it does not affect the driving unit 341 and the LEDs LED1 and LED2. Do.

The driver 341 includes a buck-boost converter circuit and controls the DC voltage output from the filter unit 339 to be consistent with the sum of the forward voltages of all the LEDs LED1 and LED2. Turn on (LED1, LED2). Therefore, even if the output of the filter unit 339 is different from the sum of the forward voltages of the LEDs LED1 and LED2, the driver 341 adjusts the output of the filter unit 339 so that the sum of the forward voltages of the LEDs LED1 and LED2. Will be adjusted.

The driver 341 may use a known buck-boost converter control scheme to control the voltage and current supplied to the LEDs LED1 and LED2 regardless of the output of the filter unit 339. Therefore, even if the output of the filter unit 339 is different every time according to the fluorescent lighting system (100, 200), there is no need for a separate tuning process to match the sum of the forward voltage of the LED (LED1, LED2).

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

As an example using the pulse width modulation control method, the driving unit 341 of FIG. 4 includes a dedicated driving IC U1, a resistor R1, R3, R4, and a capacitor C5, C7, C17 for pulse width modulation control. And a field effect transistor (FET), a diode D20, and inductors L1 and L11.

The driving IC U1 is a known LED driver IC, which senses a current flowing through the field effect transistor FET and switches the field effect transistor FET so that a constant current flows. The driving IC U1 senses a current flowing through the field effect transistor FET based on a result of comparing the CS terminal voltage, which is the voltage of the resistors R3 and R4, with a predetermined reference voltage set therein, and according to the result, The pulse signal controlling the gate terminal voltage of the effect transistor (FET) is output through the GATE terminal.

The capacitors C7 and C17 and the inductors L1 and L11 operate as LC filters, and the diode D20 causes the field effect by the reverse voltage applied to the inductors L1 and L11 when the field effect transistor FET is turned off. Used to prevent the transistor (FET) from breaking.

In addition, the driver 341 may use various known driving circuits to provide stable voltages and currents to the LEDs LED1 and LED2.

The LED lighting device 300 of FIG. 4 described above turns on the LEDs LED1 and LED2 by converting high frequency AC power input from the magnetic or electronic ballast into a stable DC power using the driving circuit 330. .

When the LED lighting device 300 of the present invention is connected to the fluorescent lighting system of the self-illuminating method, the input of the AC power is one of the two terminals of the first power terminal 311 as the path connected to the starter maintains disconnection. It is made through one of the two terminals of one and the second power terminal (313). The same is true for some electronic lighting methods. However, the combination of the first rectifying unit 336 and the second rectifying unit 337 passes through the first rectifying unit 336 to the filter unit 339, the driving unit 341, and the LEDs LED1 and LED2 to the second rectifying unit 337. To form a lung pathway through.

In addition, the AC power in some electronic lighting methods may be input only through the first power input terminal 311 without passing through the second power input terminal 313 or the second power supply terminal 311 without passing through the first power input terminal 311. It can be input only through the power input terminal 313. In this case, only one of the first rectifying unit 336 and the second rectifying unit 337 operates.

Second Embodiment

5 is a driving circuit diagram of a lighting apparatus according to another embodiment of the present invention. The driving circuit 500 of FIG. 5 includes a first power supply unit 513, a second power supply unit 515, a rectifying unit 335, a filter unit 339, and a driving unit 341. The rectifying unit 335, the filter unit 339, and the driving unit 341 have the same configuration as the first rectifying unit 336, the second rectifying unit 337, the filter unit 339, and the driving unit 341 of FIG. 4. It is explained.

The first power supply unit 513 receives AC power through the first power input terminal 311, and has a fuse F51, a first electrode J1, and a second electrode J2 connected in series with the first electrode J1. Including a varistor (SVR51) connected in parallel between the capacitor to protect the circuit of the rear end from the overvoltage or overcurrent AC power supply, and a capacitor connected between the ground and the first electrode (J1) and the second electrode (J2), respectively. C55, C56) to remove noise included in the AC power source.

In addition, a first resistor R51 and a second resistor R52 connected in series with each other are provided between the first electrode J1 and the second electrode J2, and the first capacitor C51 and the second capacitor connected in series with each other. C52 is provided between the first electrode J1 and the second electrode J2. The connection node of the first resistor R51 and the second resistor R52 and the connection node of the first capacitor C51 and the second capacitor C52 are connected to each other so that the first rectifier 336 and the second rectifier 337 are connected to each other. Is connected to the high power supply voltage (V1) of the output terminal.

Similarly, the second power supply unit 515 receives AC power through the second power input terminal 313, the fuse F52 connected in series to the third electrode J3, the third electrode J3, and the fourth electrode. A third circuit connected between the J4 and a parallel barista SVR52 to protect the circuit of the rear stage from an overvoltage or an overcurrent alternating current power source, and to connect the ground and the third electrode J3 and the fourth electrode J4, respectively. A capacitor C53 and a fourth capacitor C54 are provided to remove noise included in an AC power source.

In addition, the third resistor R53 and the fourth resistor R54 connected in series are provided between the third electrode J3 and the fourth electrode J4, and the third capacitor C53 and the fourth capacitor connected in series with each other. C54 is provided between the third electrode J3 and the fourth electrode J4. The connection node between the third resistor R53 and the fourth resistor R54 and the connection node between the third capacitor C53 and the fourth capacitor C54 are connected to each other so that the first rectifier 336 and the second rectifier ( 337) is connected to a low power supply voltage (Ground) of the output terminal.

The first to fourth resistors R51 to R54 are for a short circuit test performed by some electronic ballasts. Some ballast systems check for shorts in the fluorescent coil's internal coil and do not produce a secondary output if they are shorted. Even in such a ballast system, the driving circuit 500 includes first to fourth resistors R51 to R54 to test the short circuit through the first power input terminal 311 or the second power input terminal 313. Can pass through

Furthermore, the structure in which the high power supply voltage V1 is connected to the connection node between the first capacitor C51 and the second capacitor C52 (and the connection node between the first resistor R51 and the second resistor R52) When the AC input is input through the first electrode J1 and the second electrode J2, the AC input voltage is divided to limit the power supply voltage within a predetermined range. In addition, the structure in which the low power supply voltage Ground is connected to the connection node between the third capacitor C53 and the fourth capacitor C54 and the connection node between the third resistor R53 and the fourth resistor R54 is AC. When the input is input through the third electrode J3 and the fourth electrode J4, the AC input voltage is divided to limit the power supply voltage to a predetermined range. This structure allows the system to operate normally without malfunction or destruction of the system even in the case of a system whose output is unstable such as a self-ballast.

Although the above has been illustrated and described with respect to preferred embodiments of the present invention, the present invention is not limited to the above-described specific embodiments, it is usually in the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

10: fluorescent lamp 100: lighting system for magnetic fluorescent lamp
101: magnetic ballast 200: lighting system for electronic fluorescent
201: Electronic ballast 203, 205: Fluorescent lamp connection terminal
300: LED lighting device 311: first power input terminal
313: second power input terminal 330: driving circuit
331: First power supply unit 333: Second power supply unit
335: rectifier 336: the first rectifier
337: second rectifying unit 339: filter unit
341: driving unit 513: first power supply unit
515: second power supply

Claims (3)

A plurality of LEDs connected in parallel or in series;
A first power input terminal having a first electrode and a second electrode inserted into a first connection terminal of a fluorescent lamp lighting system of magnetic or electronic lighting type;
A second power input terminal having a third electrode and a fourth electrode inserted into a second connection terminal of the lighting system for the fluorescent lamp;
A first power supply unit which removes an overvoltage or an overcurrent component included in an AC power input from the first power input terminal;
A second power supply unit for removing an overvoltage or overcurrent component included in an AC power input from the second power input terminal;
A rectifier for full-wave rectifying the AC voltage output from the first power supply unit and the second power supply unit and outputting the rectified AC voltage to one common output terminal;
A filter unit connected to a common output terminal of the rectifying unit and converting the full-wave rectified voltage into a direct current; And
LED driving apparatus for outputting a voltage and current of the rating for the plurality of LEDs from the DC power output from the filter unit for lighting the plurality of LEDs.
The method of claim 1,
The rectifying unit,
A first rectifier provided between the first power supply unit and the common output terminal including a bridge diode; And
Including a bridge diode and a second rectifying portion provided between the second power supply and the common output terminal,
And full-wave rectifying an AC power input through the first electrode and the second electrode, the third electrode and the fourth electrode, the first electrode and the third electrode, or the second electrode and the fourth electrode. LED lighting device.
The method of claim 1,
The first power supply unit further includes a resistor provided between the first electrode and the second electrode,
The second power supply unit further comprises a resistor provided between the third electrode and the fourth electrode.

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