KR20160125805A - LED Drive using dual current controller compatible for fluorescent ballast - Google Patents

Abstract

The present invention relates to an LED lamp compatible for ballast, which is compatible with a self commutation and a line commutation of electronic ballast. The present invention suggests a circuit which fundamentally blocks an overcurrent or a flickering phenomenon, which is caused by a difference in internal resonance characteristics between the self commutation and the line commutation. According to an embodiment of the present invention, the LED lamp comprises an AC/DC rectifying section (21), a dual current controller (13), and an LED (26). The dual current controller (13) includes a first current control unit (22), a voltage detection and restriction unit (23), a filter unit (24), and a second current control unit (25).

Description

[0001] The present invention relates to a ballast compatible LED lamp driving circuit using a dual current controller,

The present invention relates to a controller of a compatible LED fluorescent lamp capable of replacing only a fluorescent lamp of a fluorescent lamp with a stabilizer already installed. Since a high efficiency LED lamp can be used without replacing a conventional fluorescent lamp, a fluorescent lamp To a driving circuit of a compatible LED lamp

Fluorescent lamps are mostly used because they have a longer life and lower power consumption than incandescent lamps.

However, in recent years, the use of LEDs, which have a lifetime of about 15 to 20 times longer than that of the fluorescent lamps, and which can reduce energy consumption by as much as about 50%, has attracted attention. In particular, It is eco-friendly because it does not use mercury and it is promising as a future lighting means.

Although the lamp using LED is economical and effective, it is difficult to dissemble the conventional fluorescent lamp apparatus and to install the LED lamp because it is expensive and inconvenient.

In order to solve this problem, Korea introduced safety certification standard (K-10025) of LED lamp substitute for fluorescent lamps so that users can easily purchase and use them.

These safety certifications should be applicable to all ballasts used in Korea. In Korea, there are six kinds of ballasts, and since there are hundreds of ballasts manufactured by manufacturers, alternative driving lamps It is a sophisticated technology field.

Generally, when the LED lamp is applied to a ballast, the flickering phenomenon mainly occurs in magnetic ballast, rapid ballast, and self-ballasted ballast, and flickering occurs frequently in the ballast ballast.

In Korea, especially electronic ballasts are mostly used, but they are classified into self-excited type and self-excited type. In general, compatible technologies in high-frequency and high efficiency middle ear type are using the resonant type converter, Although the introduction of the system has been replaced with the existing one, the fluorescent lamp is mainly used.

Controller for LED fluorescent lamps compatible with ballasts (Application No. 10-2012-0017382): Multi-stage semiconductor switches matching with resonance inductors provided in conventional fluorescent ballasts are provided to select appropriate capacitance, LED lamps are used, and only one of a plurality of switches is used, which is inefficient. Fluorescent Lamp Compatible LED Lamp Control Circuit (Application No. 10-2013-0089968): This does not provide a circuit for compatibility with both self-excited and self-tapping electronic ballasts. This is a technology for protecting against electric shock among function of compatible type ballast, which is driven by separating magnetic ballast and electronic ballast, and is an electronic ballast The contents of which are different from those of compatible technologies. Power supply (Application No. 10-2013-0000178): A circuit that matches the L-C resonant circuit in the electronic ballast by inserting an appropriate L-C ladder type impedance between the output of the electronic ballast to be compatible and the AC / DC rectifier. This does not solve the problem of re-ignition when applied to the take-off type.

Not available.

The most difficult problem to be solved in the ballast-compatible LED lamp is the compatibility of the electronic ballast, which is divided into two types, one is the ballast type and the other is the self ballast type, and the ballasts have different output characteristics. to be.

First, the self-ballasted ballast is a combination of a simple half-wave push-pull or totem-pole switching and an inductor-capacitor series resonant circuit, so that the current changes depending on the impedance of the load, . This can also cause a change in output when a compatible LED lamp is connected, resulting in trembling.

In the case of the ballast type ballast, it has almost the same circuit configuration but it is judged whether the output current flows normally by attaching the auxiliary coil to the output inductor. In case of abnormal current, The flickering due to the re-ignition occurs.

The present invention is to provide a ballast-compatible LED lamp that meets both of these characteristics.

When two types of ballast are applied to the compatible LED lamp, the problem of current flow is the hunting of the current due to the impedance matching member. It can be summarized as a repetition of the re-ignition process.

If the input circuit of the compatible LED lamp is configured as a simple passive circuit, the internal structure of the LED lamp must have the same impedance characteristic as that of the fluorescent lamp. The inside of the fluorescent lamp is in a plasma state,

If the input circuit of the compatible LED lamp can be constituted by the active circuit which focuses on the characteristics of the self-excited type, that is, the control of the current, it is possible to solve the hunting of the current appearing in the self- It can be stably maintained.

The present invention proposes a circuit compatible with both types of ballasts by constructing a current controller that is actively controlled in the input circuit section in view of the technical point of view.

In order to apply a compatible LED lamp to a conventional fluorescent lamp, it is necessary to check the type of the ballast. Most consumers do not know what type of ballast is installed in the fluorescent lamp and do not need to check it.

For this reason, despite the many advantages of LED lamps, diffusion is not taking place effectively.

SUMMARY OF THE INVENTION The present invention provides a compatible LED lamp that can easily be replaced without checking the type of ballast installed in a fluorescent lamp.

Another effect is that the present invention controls the constant current to flow in the ballast, so that the overcurrent and life reduction problem of the ballast due to the impedance matching member of the self-ballasted ballast can be solved, and high efficiency can be maintained.

Another effect is that a constant current can be continuously supplied to the LED, so that it is possible to block the fine flicker that may generally appear in the lamp, and thus the LED lamp capable of improving the light quality can be achieved.

1 is a connection diagram of a conventional electronic ballast and a compatible LED lamp according to the present invention;
Figure 2: A basic diagram of the present invention in which a dual current controller is in series and a filter and a voltage limiter are provided between the current controllers.
3: One embodiment proposed in the present invention

1 is a block diagram of a ballast-compatible LED lamp 12 connected to a conventional electronic ballast 11. The electronic ballast 11 receives a commercial voltage 10 and generates a high frequency output voltage of 20 to 50 kHz In order to improve the efficiency of the ballast itself, a resonant circuit is often used. There is a capacitor 14 for emitting thermoelectrons in the fluorescent lamp for lighting the fluorescent lamp. The ballast consists of a total of four output terminals, the two terminals being supplied with a high voltage for exciting the fluorescent lamps and the other two terminals being connected to an auxiliary capacitor 14 for applying current to the thermoelectronic coil. The electronic ballast-compatible LED lamp 12 proposed in the present invention receives all of the outputs of the conventional electronic ballast 11 as inputs and can not know which one of the output terminals of the electronic ballast is a high-voltage portion and which terminal is for heating the thermoelectric coil All the terminals are equally full-wave rectified and used. The figure is shown in FIG. The present invention proposes a dual current controller (13) as a control unit that receives the output of the electronic ballast (11) and stably supplies power to the LED.

2 shows an internal structure of the ballast-compatible LED lamp, in which four output stages of the electronic ballast 11 are constituted by the input terminal 20, and a full-wave rectifying section 21 for rectifying the high voltage is connected to any two terminals And converts the alternating current into direct current (DC) to be applied to the dual current controller 13 proposed in the present invention. The dual current controller 13 includes a first current control section 22, a voltage detection and limit section 23, a filter section 24, and a second current control section 25. The most important factor in the present invention is that the conventional compatible LED lamp as the first current control part 22 does not consider the impedance characteristic of the electronic ballast 11 because the simple filter is formed after the full wave rectifying part 21, There was a possibility of an overcurrent, and a flicker phenomenon was repeated in ignition type due to lack of current due to repetition of ignition. Since the first current control unit 22 controls the constant current to flow in the ballast when used together with the electronic ballast 11 as a constant current controller, not only the overcurrent phenomenon occurring in the self-excitation mode is fundamentally cut off, but also the main phenomenon The problem of flickering due to insufficient current can be solved. Since the first current control unit 22 performs the switching control so as to control the current to flow constantly, there is a ripple in the current, and the circuit for stabilizing the ripple is the filter unit 24. Since the current controller must be protected against the voltage The output of the first current control section 22 requires a voltage detection and limiting section 23. The voltage detecting and limiting unit 23 is constituted by a resistor voltage divider circuit or a constant voltage control IC such as a KA431 since it needs to measure a high voltage equal to or higher than a hundred V. When a voltage abnormality is detected, the current value of the first current control unit 22 is reduced So as to operate in conjunction with the first current control unit 22. The second current control unit 25 controls the LED 26 to supply a constant current to the LED 26 so that the LED 26 maintains a constant luminous flux.

FIG. 3 is a circuit diagram of a first embodiment of the present invention. FIG. 3 is a circuit diagram of a first current controller 22 constructed by a conventional boost converter. The first reactor 221, the first diode 222, and the first FET 223 And the magnitude of the current is determined by the value of the first current detecting resistor 224. The first current control IC 225 may use HV9910, which is an LED control IC, or the like, and may perform basic functions proposed in the present invention. The LED dedicated IC has a load adjustment function or an output cutoff function in the element. Since the voltage detected by the voltage detection and limit unit 23 is divided or the voltage regulating IC is used to suppress the current of the first reactor 221, Lt; / RTI > The filter section 24 mainly uses a capacitor 241. [ The second current controller 25 is a controller for supplying a constant current to the LED 26 and can use a conventional buck converter and includes a second diode 251, a second reactor 252 and a second FET 253 , And the magnitude of the current is adjusted by the second current detecting resistor 254. The second current control IC 255 can also use the same IC as the first current control IC 225. The overvoltage cutoff input (OV) of the second current control IC 255 is a function for protecting the LED 26 when an overvoltage is applied to the dc terminal and is not related to the present invention.

10: Commercial power supply
11: Conventional electronic ballast and internal schematic
12: Proposed ballast compatible LED lamp
13: Dual current controller configuration proposed by the present invention
20: Input terminal of ballast-compatible LED lamp
21: AC / DC rectification part
22: first current control section
23: Voltage detection and limitation unit
24: Filter
25: second current control section
26: LED light emitting portion
201 to 204: input terminal
221: first reactor
222: first diode
223: First FET (Field Effect Transistor)
224: a first current detecting resistor
225: first current control IC
241: Parasitic capacitors
251: a second diode
252: the second reactor
253: a second FET (Field Effect Transistor)
254: second current detection resistor
255: Second current control IC

Claims (4)

The dual current controller 13 includes a first current control section 22, a voltage detection and limiting section 23, and a second current control section 24. The AC / DC rectifying section 21, the dual current controller 13, , A filter unit (24), and a second current control unit (25).
The electronic ballast-compatible LED lamp of claim 1, wherein the first current control (22) is characterized by a burst con- verter.
The electronic ballast-compatible LED lamp according to claim 1, wherein the voltage detecting and limiting unit (23) monitors the output voltage of the first current control unit (22) and maintains the output voltage below a predetermined voltage.
The electronic ballast-compatible LED lamp according to claim 1, characterized in that the second current control (25) is a buck converter.

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