KR101649481B1 - Led lamp - Google Patents

Abstract

An LED lamp is provided. One embodiment of the present invention includes a bridge diode D1 and D2 at one end and at the other end including at least one diode connected in series and in parallel at one end and the other end of the LED lamp, A constant current control unit U2 connected to the other node of the zener diode ZD1 and a constant current control unit U2 connected in parallel with the output terminal OUT of the constant current control unit U2, A frequency discrimination unit U1 connected to an output terminal OUT of the constant current control unit U2 and one end node of the driving semiconductor Q2 and a drive semiconductor unit Q2 connected to the frequency discrimination unit U1, Capacity condensing capacitor C2 connected to the other end of the drive semiconductor Q1 and the other end of the drive semiconductor Q2 are connected by a coil L. The large capacity smoothing capacitor C2 and the other end At least one LED (LED1-N) connected in parallel and in series between the bridge diodes (D2) A first electric shock protection switch PS1 connected to at least one diode included in the bridge diode D1 and a second electric shock protection switch PS2 connected to at least one diode included in the bridge diode D2, .

Description

LED lamp {LED LAMP}

The present invention relates to an LED lamp.

Recently, as interest in energy consumption and environmental resources is rapidly increasing, most fluorescent lamps and incandescent lamps installed in homes and cities are being replaced by LED lamps. At this time, a lot of research is being carried out in order to fix things that have not occurred in conventional fluorescent lamps or incandescent lamps when replacing fluorescent lamps or incandescent lamps with LED lamps.

In order to eliminate the inconvenience of replacing and installing the LED lamp, the LED lamp uses a method that does not remove the starter while maintaining a constant brightness irrespective of the electronic ballast or the magnetic ballast. In this connection, Korean Patent Publication No. 2012-0124756 (published on November 14, 2012) discloses an LED lamp capable of maintaining the same brightness regardless of the type of the ballast or the ballast in the process of replacing the LED lamp Is disclosed.

In the process of replacing the LED lamp, when the LED lamp is inserted into the LED lamp socket, the user must support one end of the electrode at one end of the LED lamp socket and then connect the other end of the electrode to the other end of the LED lamp. Unless an electric shock prevention circuit is separately provided in the LED lamp itself in the process, a risk of a safety accident such as an electric shock accident may occur. In addition, the current flowing between the electrodes can not be limited by only the thermistor connected between the both end electrodes.

In an embodiment of the present invention, a bridge diode and an electric shock protection switch provided at electrodes at both ends are provided as a short-circuiting switch, so that even when one end of the electrode is sandwiched between the LED lamp socket and the other end electrode is held by a user It is possible to provide an LED lamp capable of preventing an electric shock by preventing a current loop from being formed at the other end electrode and controlling a current value flowing between the electrodes by connecting a capacitor in series with a thermistor. It should be understood, however, that the technical scope of the present invention is not limited to the above-described technical problems, and other technical problems may exist.

According to an aspect of the present invention, there is provided a light emitting diode (LED) including a first and a second bridge diodes (D1 and D2) including at least one diode connected in series and in parallel at one end and the other end of an LED lamp, A constant current control unit U2 connected to the other end node of the Zener diode ZD1 and a constant current control unit U2 connected in parallel with the bridge diode D1 at one end, a capacitor and Zener diodes R1, C1 and ZD1, A frequency discriminating unit U1 connected to an output terminal OUT of the constant current control unit U2 and one end node of the driving semiconductor Q2, a frequency discriminating unit U1, a driving semiconductor Q2 connected to the output terminal OUT, A large capacity smoothing capacitor C2 connected to the other end of the driving semiconductor Q1 and the other end of the driving semiconductor Q2 are connected by a coil L and a large capacity smoothing capacitor (C2) and the bridge diode (D2) at the other end, At least one diode (LED1-N) connected to the bridge diode (D2), a first electric shock protection switch (PS1) connected to at least one diode included in the bridge diode (D1) And a second electric shock protection switch PS2 connected thereto.

According to any one of the above-mentioned objects of the present invention, the probability of a safety accident that may occur in the process of replacing an LED lamp can be minimized, and a method of controlling a capacitance value of a capacitor It can be easily controlled.

1 is a cross-sectional view and a circuit diagram for explaining an LED lamp according to an embodiment of the present invention.
2 is a circuit diagram according to an embodiment of the present invention in which the input of the frequency discrimination unit of the LED lamp of FIG. 1 is connected to a DC power source.
3 is a circuit diagram according to another embodiment in which the input of the frequency discrimination unit of the LED lamp of FIG. 1 is connected to a DC power source.
4 is a circuit diagram of the LED lamp of FIG. 1 as an electronic ballast.
Fig. 5 is a circuit diagram showing a circuit diagram in which a conventional electronic ballast is connected to a fluorescent lamp and an equivalent circuit at the time of lighting a fluorescent lamp.
6 is a graph showing an applied voltage and an applied current according to a general fluorescent lamp operation sequence.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when an element is referred to as "including" an element, it is to be understood that the element may include other elements as well as other elements, And does not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view and a circuit diagram for explaining an LED lamp according to an embodiment of the present invention. The LED lamp 100 according to an embodiment of the present invention may have a left electrode and a right electrode as shown in (a), and include at least one LED between the left and right electrodes. (B) The LED lamp 100 according to the embodiment of the present invention includes the first protection switch PS1 and the second protection switch PS2 so that only one of the electrodes P1, The leakage current can be prevented so as to prevent electric shock due to the flow to the human body while the other electrodes P3 and P4 are connected to the lampholder and not connected to the LED lamp socket. In the LED lamp 100 according to the embodiment of the present invention, by connecting the capacitors C3 and C4 in series with the thermistors SR1 and SR2, the current flows only when a preset AC frequency is applied .

Hereinafter, the LED lamp 100 according to an embodiment of the present invention will be described in detail with reference to FIG. 1 (b).

The LED lamp 100 according to an embodiment of the present invention includes the electrodes P1, P2, P3 and P4, the thermistors SR1 and SR2, the capacitors C3 and C4, the bridge diodes D1 and D2, The frequency discriminating unit U1, the constant current control unit U2, the coil L, the at least one capacitor C1, the zener diode ZD1, the large capacity smoothing capacitor C2, the driving semiconductors Q1 and Q2, And may include one LED (LED1 to N), a first electric shock protection switch PS1, a second electric shock protection switch PS2, fuses FUSE1 and FUSE2, and a resistor R2.

First, the LED lamp 100 may be provided with electrodes P1, P2 and P3, P4 that can be electrically and physically inserted into the LED lamp socket at both ends thereof.

The thermistor and capacitors SR1 and C3 and SR2 and C4 may be connected in series between the one end of the LED lamp 100 and the electrodes P1 and P2 and P3 and P4 at the other end. When the thermistors SR1 and SR2 are used between the electrodes P1 and P2 and between the electrodes P3 and P4, for example, in the case of a general fluorescent lamp of 32 W, even if the voltage is instantaneously applied up to 4.52 A at the time of preheating, ) Is instantaneously increased, so that a relatively low preheating current flows, and after that, it is kept low by a resistance value of Ohm, so that it can be used like a filament resistance. That is, although the filament resistance is in the unit of a few meters, even if a large current is applied during the preheating, the thermistor SR1 and SR2 are made of a durable metal, You can use it together.

The thermistors SR1 and SR2 may be a negative resistance thermistor (NTC). The negative resistance thermistor restricts the current to a very large resistance value, for example, when a large current of 4.52 A is applied to both ends of the thermistors SR1 and SR2 at the time of initial preheating, Can be connected to each other. When the lamp is turned on for a predetermined period of time, the resistance thermistor becomes a low resistance state and can maintain the resistance value like the filament resistance. This is not an obstacle to circuit operation even after the lamp is turned on. So that it can be adapted to the LED lamp 100.

The capacitors C3 and C4 are designed to have a large capacitance for an alternating current signal of 60 Hz in a magnetic ballast so that the filament current flows relatively low and the electronic ballast has a relatively low capacitance to limit the filament current do. For example, assume that capacitors C3 and C4 have capacities of 0.1 volts respectively. In such a case, if the magnetic ballast is used, the signal applied to both ends of the electrodes P1, P2, P3 and P4 is AC 220 V 50 Hz or 60 Hz and the capacitance value of the capacitor C3 or C4 is given by the following equation So that a relatively small current flows across P1 and P2 at both ends of P3 and P4.

At this time, the maximum current that can flow is 220V / 265.3K? = 829? A. On the other hand, in the case of the electronic ballast, since a high frequency of about 25 KHz to 75 KHz is applied, the capacitance value at this time is given by the following equation (2) ).

At this time, the maximum current that can flow is 150V / 636? = 0.235 ?. In this way, when the capacitances of the capacitors C3 and C4 are different from each other, the current flowing between the electrodes P1 and P2 and the current flowing between the electrodes P3 and P4 can be limited have.

The bridge diodes D1 and D2 may include at least one diode connected in series and in parallel at one end and the other end of the LED lamp 100. Here, a bridge diode D1 is connected to the electrodes P1 and P2, and a bridge diode D2 is connected to the electrodes P3 and P4. At this time, the first electric shock protection switch PS1 and the second electric shock protection switch PS2 may be connected to the - output portion of the bridge diodes D1 and D2.

The resistor, the capacitor and the zener diodes R1, C1 and ZD1 may be connected in parallel with the bridge diode D1 at one end. Here, the high-frequency preheating and starting voltage applied to both ends of the thermistors SR1 and SR2 can be converted to a DC power source including a ripple component through the bridge diode D1 and the capacitor C1. As shown in FIG. 6, the preheating voltage (section A) is not greater than the starting voltage (section C and section D), but may be rapidly increased at the beginning of the startup phase (section C). In the LED lamp 100, since the ignition voltage (section E) output after the start becomes the power source for driving the actual LED lamp 100, the starting voltage may be the same as the surge in the LED lamp 100 . This can be prevented from being larger than the allowable operation voltage that the constant current control unit U2 can withstand by using the zener diode ZD1.

Referring again to FIG. 1, the constant current control unit U2 may be connected to the other node of the zener diode. Here, the constant current control unit U2 can control the capacitance of the large capacity smoothing capacitor C2 as the output of the frequency determination unit U1 is turned on and off.

The driving semiconductor Q2 may be connected to the output OUT of the constant current control unit U2. Here, the driving semiconductor Q2 may be composed of a transistor.

The frequency discrimination unit U1 may be connected to the output terminal OUT of the constant current control unit U2 and one node of the driving semiconductor Q2. The frequency discrimination unit U1 detects the frequency by receiving the output signal of the constant current control unit U2 or rectified pulsating current and when the frequency is 1 KHz or less, the driving semiconductor Q1 or the driving semiconductor Q1 The smoothing capacitor can be increased or decreased by operating the large capacity smoothing capacitor C2 via the relay.

The driving semiconductor Q1 may be connected to the frequency discrimination unit U1. Here, the driving semiconductor Q1 may be composed of a transistor.

The large capacity smoothing capacitor C2 may be connected to the other end of the driving semiconductor Q1.

The at least one LED (LED1 to LED N) may be connected to the other end of the driving semiconductor Q2 by a coil L and may be connected in parallel and in series between the large capacity smoothing capacitor C2 and the bridge diode D2 at the other end have.

The first electric shock protection switch PS1 is connected to at least one diode included in the bridge diode D1 and the second electric shock protection switch PS2 is connected to at least one diode included in the bridge diode D2 . Here, the first electric shock protection switch PS1 and the second electric shock protection switch PS2 may be short-circuiting switches.

The operation of the LED lamp 100 having the above-described configuration will be described below.

First, when the electrodes P1 and P2 at one end of the LED lamp 100 are mounted on the LED lamp socket, the contact GND of the first electric shock protection switch PS1 is connected to the electrode P1 and the bridge diode D1 , A first current loop # 1 through the first electric shock protection switch PS1 may be formed. A second current loop # 2 is formed through the contact GND of the first electric shock protection switch PS1 and the contact GND of the second electric shock protection switch PS2 and the second electric shock protection switch PS2 And the third current loop # 3 through the bridge diode D2 and the electrodes P3 and P4 at the other end of the LED lamp are not formed by the PS2 contact being not connected.

Accordingly, even if the user touches the electrodes P3 and P4, since the second electric shock protection switch PS2 is opened, the third electric current loop # 3 is not formed and the electric shock protection function is implemented . Thereafter, when the user clamps all of the electrodes P3 and P4 to the LED lamp socket, the second electric shock protection switch PS2 is also connected, so that the first to third current loops # 1 to # 3 are all formed A normal operation can be performed.

The electrodes P1, P2, P3 and P4 of the LED lamp 100 are respectively connected to a common LED lamp socket so that the ballast preheats the filament with the preheating currents A and B as shown in FIG. . This current can be applied between the electrodes P1 and P2 and between the electrodes P3 and P4, respectively. This current can limit the abrupt current flow due to the instantaneous increase in the thermistor resistance value, while forming a current circuit through internally connected thermistors (SR1, SR2).

At least one of the LEDs (LED1 to N) may be connected in series and in parallel, and the coil L may be connected in series and driven by the driving semiconductor Q2. The current flowing through the at least one LED (LED1 to LED N) may be sensed in the form of a voltage across the resistor R2 and transmitted to the constant current control unit U2 as a feedback signal. At least one of the LEDs (LED1 to N) may use a PWM method for efficient current driving. If the current flowing through the at least one LED (LED1 to LED N) is larger than a predetermined current, the voltage across the resistor R2 increases, In the constant current control unit U2, the width of the driving PWM signal may be narrowed or the frequency may be increased to reduce the current flowing through at least one LED (LED1 to LED N). Conversely, if the voltage across the resistor R2 decreases, it may be the same as a general PWM control function that increases the current flowing through at least one of the LEDs (LED1-N) because the width of the drive PWM signal is widened or lowered.

However, assuming that the size of the DC power applied to the constant current control unit U2 uses the size of the series connection voltage of at least one of the LEDs LED1 to N, for example, 30 LEDs, 3.1VX30 = If it is determined that they are the same or lower, the driving semiconductor Q2 can be always turned on by outputting a HIGH signal DC without outputting the PWM control output. In this case, at least one LED (LED1 to LED N) is connected to the DC power source, a circuit in which the coil L and the current sensing resistor R2 are connected in series is formed, and the constant current control function of the constant current control unit U2 And the pulse current signal on the DC power source forms a constant reactance value on the coil L so that a constant current flows through the at least one LEDs LED1 to N. [ Accordingly, when the output of the constant current control unit U2 is DC output HIGH, the frequency discrimination unit U1 turns off the driving semiconductor Q1 so that the smoothing capacitor C2 is not connected to the ground GND can do. The matters not described in the LED lamp 100 according to the embodiment of the present invention are described in detail in the applicant's prior application publication No. 2012-0124756 (published on Nov. 14, 2012) It will be omitted.

FIG. 2 is a circuit diagram according to an embodiment of the present invention in which the input of the frequency discrimination unit of the LED lamp of FIG. 1 is connected to a DC power source, and FIG. 3 is a circuit diagram of another example of connecting the input of the frequency discrimination unit of the LED lamp of FIG. Fig. 4 is a circuit diagram of the LED lamp of Fig. 1 as an electronic ballast. Fig.

Referring to FIG. 2, FIG. 2 is a circuit diagram in which the input of the frequency determination unit U1 is directly connected to a rectified DC power source. When using an electronic ballast or a magnetic ballast, there is a difference in the smoothed ripple frequency, for example, when a magnetic ballast is used at a frequency source of 60 Hz, 120 Hz can be a ripple signal after full wave rectification. Likewise, it can be 100 Hz in a 50 Hz environment. In some cases, in the case of military equipment, a 400 Hz power supply is used and a pulsating signal of 800 Hz can be generated. Further, in some rectifying circuits, in order to improve the power factor, for example, a pulse signal of 360 Hz, which is three times the basic pulsating frequency, is generated in a use environment of a 60 Hz power supply which adds a voltage doubler circuit of three times. As a result, in the case of the magnetic ballast circuit, the maximum value of the pulsating frequency can be considered to be 1 KHz or less. In the frequency discrimination unit U1 according to the embodiment of the present invention, The large capacity smoothing capacitor C2 is connected to the ground GND and the smoothing capacity is increased to make the ripple component small and close to the DC voltage.

3, when a magnetic ballast is connected by connecting the frequency discrimination unit U1 to a DC power source to read a pulsating current signal, and a magnetic ballast for detecting a signal of 1 KHz or less is used or directly applied to a 60 Hz AC power supply, The relay RL1 is driven using the switch Q1 so that the contacts 1-2 of the relay contacts SW1 and SW2 are short-circuited. At this time, the circuit is configured so that the large capacity smoothing capacitor C2 is connected to the ground and at least one LED (LED1 to LED) is connected in series with the constant current diodes D3, D4 and D5, May be supplied to the LEDs (LED1 to N). Conversely, when used in an electronic ballast circuit, the output of the driving semiconductor Q1 is turned off, the relay RL1 is turned off, and the 1-3 contacts of the relay contacts SW1 and SW2 are short- C2 are disconnected, at least one of the LEDs (LED1 to LED N) can be configured in series with the coil L and the current sensing resistor R2.

4, when the LED lamp 100 is used as an electronic ballast, the frequency discriminating unit U1, the driving semiconductor Q1, and the large capacity smoothing capacitor C2 are removed, and the constant current control unit U2 And may be connected to a node between the other end node of the Zener diode ZD1 and at least one LED. However, in an environment where an electronic ballast is used, the output voltage of the electronic ballast is rectified to obtain a DC power source. When the power source is high, the constant current control unit U2 performs PWM control May be operable to supply a constant current to at least one of the LEDs (LED1-N). Conversely, when the output voltage of the electronic ballast is low, the driving semiconductor Q2 is always set to ON so that the output of the constant current control unit U1 becomes DC high, and at least one LED LED1 to N and the coil L and the current sensing resistor R2 are connected in series to limit the current flowing to at least one of the LEDs LED1 to N with the reactance value of the coil L, So that current can flow. Accordingly, the LED lamp 100 according to an embodiment of the present invention can have a constant brightness without causing a difference in brightness among the respective ballasts as in the conventional LED lamp using only the conventional coil.

FIG. 5 is a circuit diagram showing a circuit diagram in which a conventional electronic ballast is connected to a fluorescent lamp and an equivalent circuit when the fluorescent lamp is lit, and FIG. 6 is a graph showing an applied voltage and an applied current according to a general fluorescent lamp operation sequence.

Referring to FIG. 5A, the output of a conventional electronic ballast is combined with a fluorescent lamp. The DC voltage obtained through the rectifying unit U3 is supplied to the switching control unit U4. The switching control unit U4 operates to apply a specific oscillation frequency to the driving semiconductor Q3 and Q4 to apply a preheating signal to the fluorescent lamp T1 and a starting signal and to supply a constant lighting voltage to the fluorescent lamp T1 after being turned on. At this time, the current flowing through the fluorescent lamp T1 is sensed through the resistors R3 and R4, fed back to the switching control unit U4, and a constant current flows through the fluorescent lamp. The switching control unit U4 continuously supplies the control output to the driving semiconductor units Q3, Q4. 6, when the start signal is applied after the preheating signal, the electronic ballast is turned on while the fluorescent lamp T1 starts discharging at a resonance frequency formed by the oscillation coil LO and the oscillation capacitor C0, The current continues to flow through the fluorescent lamp. At this time, in the fluorescent lamp equivalent circuit after the fluorescent lamps are turned on after the lighting, the fluorescent lamp can be likened to the load (LOAD) as shown in Fig. 5 (b). That is, a constant current does not always flow in the load LOAD due to the influence of the gas amount inside the fluorescent lamp and the surrounding use temperature. However, when the LED lamp 100 in the same configuration is used, . That is, the characteristics of the LED lamp 100 are such that a constant current always flows by incorporating a constant current circuit, so that the pre-heating of the fluorescent lamp stabilizer and the lighting operation after the output of the start signal are stably performed, The LED lamp 100 can be used even in a general ballast if the LED lamp 100 is operated within the rated output current and voltage range of the LED lamp 100. [

The LED lamp 100 according to an embodiment of the present invention having the above-described configuration and operation can have the following effects.

First, a general LED lamp uses a magnetic ballast and a magnetic ballast separately. In a magnetic ballast circuit, a starter must be removed. However, the LED lamp of the present invention forms a current loop like a filament through a thermistor in a magnetic ballast circuit. Can be used without removing the starter. Secondly, when connected to electronic ballast, the existing LED lamp does not have a part for replacing the filament of fluorescent lamp. When using the coil like some products, the resistance is too high when the initial preheating current is applied. However, since the LED lamp of the present invention plays a role of a fluorescent filament while protecting the circuit by applying a large amount of initial preheating current by using a thermistor, the preheating and starting of the ballast , The lighting operation can be normally performed, so that stable voltage and current can be supplied to the LED lamp without causing the ballast to burn out, breakage, or vibration. Third, when the electronic ballast enters the starting phase after the preheating operation, a high starting voltage (for example, 600 V) is applied to both ends of the lamp together with a high frequency. Such a voltage is limited to a certain voltage or less to protect the LED lamp and the driving circuit can do. Fourth, when an electronic ballast is connected, the onion signal, which has a high output frequency of the ballast through the bridge rectifier circuit, is short-circuited to a large number of grounds when the capacity of the smoothing capacitor is large. As a result, the output of the electronic ballast is short- However, in the present invention, only a small capacity smoothing capacitor is connected and smoothed to prevent the problem of burnout or breakage of the ballast. Fifth, when the magnetic ballast is connected, the output voltage of the ballast is the same as that of the supply power after the preheating signal, so that the frequency is one of the forms of 50HZ, 60HZ, 400HZ, and a very low signal is applied to the bridge diode In this case, since a frequency is low, a high-capacity smoothing capacitor is required in order to form a DC power source necessary for operation. However, in the present invention, since the capacity is increased by automatically connecting a large capacity smoothing capacitor by sensing a frequency, . Sixth, since the LED lamp of the present invention can be used without distinguishing between the magnetic ballast and the electronic ballast in the same manner as the conventional fluorescent lamp, it is possible to obtain an effect of facilitating installation and replacement, and an electronic ballast or a magnetic ballast It is possible to use it by directly connecting to the AC power source, so that it is not necessary to newly purchase and install the ballast, so it is possible to reduce the waste of resources. Although the output voltage of the electronic ballast used in the market is high and low, and the deviation is large, in the present invention, the control output frequency of the constant current control unit is automatically changed according to the applied voltage at a constant output voltage, , The output of the constant current control unit becomes high state when the serial sum voltage of the LED is lower than or equal to the serial sum voltage of the LED, so that the driving semiconductor is always turned on, so that only the coil is connected in series to the LED, and a high pulse current is applied to the coil, So that a constant current can flow through the LED. Eighthly, since the electric shock protection switch is provided at one side of the output terminal of the bridge diode connected between the both-end electrodes, it is possible to protect the electric shock hazard from the risk of electric shock in handling by the user, The volume can be reduced.

The LED lamp according to the embodiment described with reference to Figs. 1 to 4 may also be embodied in the form of a recording medium including an application executed by a computer or a computer-executable instruction such as a program module. Computer readable media can be any available media that can be accessed by a computer and includes both volatile and nonvolatile media, removable and non-removable media. In addition, the computer-readable medium can include both computer storage media and communication media. Computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Communication media typically includes any information delivery media, including computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave, or other transport mechanism.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

Claims (8)

In an LED lamp,
One end and the other end of the bridge diode (D1, D2) including at least one diode connected in series and in parallel at one end and the other end of the LED lamp;
A resistor, a capacitor and a Zener diode (R1, C1, ZD1) connected in parallel to the bridge diode (D1) at the one end;
A constant current control unit (U2) connected to the other node of the Zener diode (ZD1);
A driving semiconductor (Q2) connected to an output terminal (OUT) of the constant current control unit (U2);
A frequency discrimination unit U1 connected to an output terminal OUT of the constant current control unit U2 and one node of the driving semiconductor Q2;
A drive semiconductor (Q1) connected to the frequency discrimination unit (U1);
A large capacity smoothing capacitor C2 connected to the other end of the driving semiconductor Q1;
At least one LED (LED1 to LED N) connected in parallel and in series between the large capacity smoothing capacitor C2 and the bridge diode D2 at the other end, the other end of the driving semiconductor Q2 being connected by a coil L, ;
A first electric shock protection switch PS1 connected to at least one diode included in the bridge diode D1;
A second electric shock protection switch PS2 connected to at least one diode included in the bridge diode D2; And
And thermistors and capacitors (SR1, C3 and SR2, C4) connected in series between the electrodes (P1, P2 and P3, P4) at one end and the other end of the LED lamp,
The capacity of the large capacity smoothing capacitor C2 is increased or decreased as the output of the frequency determining unit U1 is turned on and off,
When the electrodes P1 and P2 of the LED lamp are mounted on the LED lamp socket, the contact GND of the first electric shock protection switch PS1 is connected to the electrode P1, the bridge diode D1, A first current loop # 1 through the first electric shock protection switch PS1 is formed,
A second current loop # 2 is formed through the contact GND of the first electric shock protection switch PS1 and the contact GND of the second electric shock protection switch PS2,
The third current loop # 3 through the second electric shock protection switch PS2 and the bridge diode D2 and the electrodes P3 and P4 at the other end of the LED lamp is not formed,
Wherein the first electric shock protection switch PS1 and the second electric shock protection switch PS2 are short-circuiting switches.
delete The method according to claim 1,
Wherein the thermistors (SR1, SR2) are negative resistance thermistors (NTC).
The method according to claim 1,
And the current flowing to the one end and the other end of the LED lamp is controlled based on the capacitances of the capacitors (C3, C4).
delete The method according to claim 1,
The frequency discrimination unit U1 senses a frequency by receiving the output signal of the constant current control unit U2 or rectified pulsating current and when the frequency is 1 KHz or less, the driving semiconductor Q1 or the driving semiconductor Q1, And an LED lamp which increases the smoothing capacity by controlling the large capacity smoothing capacitor (C2) through the relay.
The method according to claim 1,
When the LED lamp is used as an electronic ballast, the frequency discriminating unit U1, the driving semiconductor Q1, and the large capacity smoothing capacitor C2 are removed,
Wherein the constant current control unit (U2) is connected to a node between the other node of the zener diode (ZD1) and the at least one LED (LED1-N).
delete

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