KR102221031B1 - Led lighting apparatus having automatic-return type 380v overvoltage protection function - Google Patents

Abstract

The present invention relates to an LED lamp having an automatic reset type 380 V overvoltage protecting function, which comprises: an LED module (100) for emitting light when driving power is supplied; and a power supply circuit module (200) for receiving commercial power to supply the same to the LED module (100). According to the present invention, a failure of a circuit component due to overvoltage can be prevented.

Description

LED lighting equipment with automatic return type 380V overvoltage protection {LED LIGHTING APPARATUS HAVING AUTOMATIC-RETURN TYPE 380V OVERVOLTAGE PROTECTION FUNCTION}

The present invention relates to an LED lighting fixture equipped with an auto-recovery type 380V overvoltage protection function, and more particularly, wiring work in an environment where commercial power is supplied by a three-phase four-wire Y-wire distribution supply method so that 380V and 220V can be used simultaneously It relates to an LED lighting fixture equipped with an auto-recovery type 380V overvoltage protection function capable of maintaining durability without damage or breakdown of circuit parts even if an overvoltage of 380V is applied to the power supply line exclusively for 220V due to a faulty wiring or disconnection of the neutral wire. .

In general, in places where commercial power is supplied by a 3-phase 4-wire Y-connection distribution supply method such as a large building or factory, 220V-only electric wiring for electric equipment such as lighting and 380V-only power devices such as pumps Electric wiring for 380V is installed for the electric equipment of

Here, FIG. 1 shows electrical wiring of a general three-phase four-wire Y-connected distribution supply method. Referring to the drawing, the 3-wire 4-wire Y connection can be selectively used for 380V or 220V depending on how the power input line is connected to the electric wires of R, S, and T phases and the neutral wire (N). If the power input line is connected between any one of the S-phase and T-phase and the neutral wire (N), a commercial power of 220V is applied and can be used, and power is input between two of the R-phase, S-phase and T-phase When the line was connected, commercial power of 380V was applied and used.

However, if the power input line is incorrectly wired between the two phases of the R, S and T phases or the neutral line (N) is disconnected during the wiring work of the LED lighting fixture, an overvoltage of 380V is applied to the 220V commercial power supply line. There is a problem in that the power supply circuit component of the LED lighting fixture is damaged or malfunctions occur.

In addition, in the power supply circuit of the LED luminaire according to the prior art, component elements for preventing overvoltage, such as varistors, capacitors, and inductors, are circuitd at the input terminal, but this can only prevent temporary overvoltage, and continue due to incorrect wiring as described above. When the overvoltage is applied as a result, there is a problem that the function cannot be performed. Moreover, when an overvoltage is applied, the power is not completely cut off and the output voltage is pulsated. This pulsating voltage is applied to the component element at the rear stage, resulting in unstable driving or failure.

Unexamined Patent Publication No. 10-2007-0077341 (2007. 07. 26), power supply device.

The present invention was created to solve the above-described problems, and an object of the present invention is to provide a commercial power supply in a three-phase, four-wire Y-wire distribution supply method, so that 380V and 220V can be used simultaneously. When an overvoltage of 380V is applied to the power supply line exclusively for 220V due to the disconnection of the circuit, the driving voltage supplied to the control IC of the control circuit is automatically cut off, preventing damage or breakdown of circuit parts caused by the overvoltage in advance. It is to provide an LED lighting fixture equipped with a 380V overvoltage protection function.

Another object of the present invention is an automatic return type 380V overvoltage protection function that automatically supplies a driving voltage to the control IC without any separate operation or setting change when a commercial power of 220V is normally applied due to the restoration of the disconnection of the faulty wiring or the neutral wire. It is to provide the equipped LED lighting equipment.

According to a feature of the present invention, the LED module 100 for driving light emission when the driving power is supplied; And a power supply circuit module 200 that receives commercial power and converts it into a form of LED driving power and supplies it to the LED module 100, wherein the power supply circuit module 200 is a power supply through a three-phase line. A filter circuit 210 that filters and stabilizes the voltage of the three-phase AC power input to the input terminal 201, a rectifier circuit 220 that rectifies and smoothes the stabilized AC voltage into a DC voltage, and the input control signal The transformer circuit 230 converts the rectified and smoothed DC voltage into the size of the set voltage and outputs it to the power output terminal 202 to which the LED module 100 is connected, and the rectified and smoothed DC voltage is oscillated according to the control signal. When a driving voltage is supplied from the oscillation circuit 240 and the transformer circuit 230 to the power supply terminal 8, a control signal is output to the transformer circuit 230 and the oscillation circuit 240 for driving control, and the driving voltage is A control circuit 250 including a control IC 251 that stops driving when not supplied, and a transformer circuit to the power supply terminal 8 of the control IC 251 when the rectified and smoothed DC voltage is a normal voltage of 220V. An overvoltage protection circuit that grounds and blocks the driving voltage of the transformer circuit 230 supplied to the power supply terminal 8 when the rectified and smoothed DC voltage is an overvoltage of 380V ( 260), characterized in that the automatic return type 380V overvoltage protection is provided with an LED lighting device.

According to another feature of the present invention, the overvoltage protection circuit 260 includes first resistors R21 and R7 and second resistors R19 which are circuitly connected in series to a circuit line to which the DC and smoothed DC voltages are applied. And, a Zener diode D6 having a cathode connected between the first resistors R21 and R7 and the second resistor R19, and a base connected to the anode of the Zener diode D6, and a collector having the transformer circuit ( It is connected to the circuit line to which the driving voltage is applied to the power supply terminal 8 of the control IC 251 from 230), and the emitter includes a switching device Q2 connected to the ground terminal GND. LED lighting equipment equipped with a type 380V overvoltage protection function is provided.

Meanwhile. According to another feature of the present invention, the overvoltage protection circuit 260 is circuit-connected between the anode of the zener diode D6 and the ground terminal GND, so that the switching device Q2 is formed through the zener diode D6. There is provided an LED lighting fixture equipped with an auto-recovery type 380V overvoltage protection function, characterized in that it further comprises a capacitor (EC4) for smoothing the driving voltage applied to the base.

According to the present invention as above,

First, the overvoltage protection circuit 260 of the power supply circuit module 200 is a control IC 251 included in the control circuit 250 if the DC voltage rectified and smoothed by the rectifier circuit 220 is a normal voltage of 220V. As the driving voltage of the transformer circuit 230 is supplied to the power supply terminal 8 of the LED module 100 as a control signal is output to the transformer circuit 230 and the oscillation circuit 240, the LED module 100 drives light emission normally, and the rectification And if the smoothed DC voltage is an overvoltage of 380V, the driving voltage of the transformer circuit 230 supplied to the power supply terminal 8 is grounded and cut off, thereby preventing burnout or failure of the circuit component due to the overvoltage.

Second, the overvoltage protection circuit 260 includes a first resistor (R21, R7) and a second resistor (R19) connected in series to a circuit line to which the DC and smoothed DC voltages are applied, and the first resistor. A Zener diode (D6) having a cathode connected between (R21, R7) and a second resistor (R19), and a base connected to the anode of the Zener diode (D6), and a collector from the transformer circuit 230 to control IC ( A simple circuit using inexpensive circuit components, such as connected to the circuit line to which the driving voltage is applied to the power supply terminal (8) of the 251, and the emitter includes a switching device (Q2) connected to the ground terminal (GND). The configuration can implement the overvoltage protection function.

Third, the overvoltage protection circuit 260 further includes a capacitor EC4 circuitly connected between the anode of the zener diode D6 and the ground terminal GND, and thus the switching device Q2 through the zener diode D6. By smoothing the driving voltage applied to the base of ), a non-uniform driving voltage is applied to the base of the switching device Q2, thereby preventing the switching device Q2 from malfunctioning.

1 is a schematic diagram showing electric wiring of a general three-phase four-wire Y-connection distribution supply method;
2 is a schematic diagram showing the configuration of an LED lighting fixture equipped with an automatic return type 380V overvoltage protection function according to a preferred embodiment of the present invention;
3 is a circuit diagram showing a circuit configuration of a power supply circuit module according to a preferred embodiment of the present invention;
4 and 5 are circuit diagrams showing the circuit configuration and operation principle of an overvoltage protection circuit according to a preferred embodiment of the present invention.

Objects, features, and advantages of the present invention described above will become more apparent through the following detailed description. Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

The LED lighting fixture 1 equipped with an auto-recovery type 380V overvoltage protection function according to a preferred embodiment of the present invention is a 3-phase 4-wire Y-wired distribution supply method, and commercial power is supplied to it in an environment where 380V and 220V can be used simultaneously. As a lighting device capable of maintaining durability without damage or breakdown of circuit parts even if an overvoltage of 380V is applied to the power supply line dedicated to 220V due to incorrect wiring or disconnection of the neutral wire between operations, driving power is supplied as shown in FIG. When it includes an LED module 100 for driving light emission and a power supply circuit module 200 for supplying LED driving power. Here, the LED driving power means a power converted into a driving power for driving the LED module 100 (eg, DC power of 45V, 3A, 60Hz).

The power supply circuit module 200 is a power supply means that receives commercial power and converts it into a form of LED driving power and supplies it to the LED module 100. As shown in FIG. 3, a filter circuit 210 and a rectifier circuit 220, a transformer circuit 230, an oscillation circuit 240, a control circuit 250, and an overvoltage protection circuit 260.

First, the filter circuit 210 filters and stabilizes the voltage of the three-phase AC power source 220V input to the power input terminal 201 via the three-phase line. For this purpose, a circuit may be configured including a fuse FUSE1, a varistor VA1, capacitors C2, C1, CC1, CC2, C3, and inductors LF1 and LF2.

The rectifying circuit 220 rectifies and smoothes the AC voltage stabilized by the filter circuit 210 into a DC voltage. To this end, the AC voltage is rectified by the bridge diodes D1 to D4, and the DC voltage is smoothed by the capacitor C4 and the inductor LF3.

Here, it is preferable that the circuit components included in the filter circuit 210 and the rectifier circuit 220 have a breakdown voltage capable of withstanding an overvoltage of 380V. For example, the bridge diodes D1 to D4 may have a breakdown voltage of 1KV, the varistor VA1 560V, and the FET 800V. Each circuit component has different ratings for each component, so that the required breakdown voltage is different, but it is preferable that the circuit is designed to enable normal driving even at a voltage level of 380V ± 10% or more.

The transformer circuit 230 converts the rectified and smoothed DC voltage into a set voltage according to a control signal input from the control circuit 250 and outputs it to the power output terminal 202 to which the LED module 100 is connected. Here, as shown in FIG. 3, the transformer circuit 230 is composed of a primary transformer and a secondary transformer (T2-B), and the primary transformer transfers the applied voltage to the secondary transformer (T2-B). It includes a power supply coil (DRAIN-T1-A) that oscillates to induce and an auxiliary coil (VCC-T1-A) that is an oscillation stage source. In addition, the transformer circuit 230 is insulated with a withstand voltage of 2KV or more through single unit inspection, and is cut off before the input voltage is supplied, so that it is not damaged by an overvoltage of 380V.

In addition, the auxiliary coil (VCC-T1-A) is circuit-connected to the power supply terminals 8 of the control ICs (U1, 251) included in the control circuit 250, and is excited by the secondary transformer (T2-B). If so, the control IC 251 can be driven by applying a driving voltage to the power supply terminal 8.

In addition, as shown in FIG. 3, a secondary rectifier circuit 271 is disposed at the rear end of the transformer circuit 230 to rectify and smooth the power converted to the set voltage. The secondary rectification circuit 271 may rectify power with capacitors CC1_T2, diodes D1_T2 and D2_T2, and resistors R1_T2 and R2_T2, and smooth power rectified with capacitors EC1_T2 and EC2_T2 and resistor R3_T2. .

In addition, a flicker removal circuit 272 for removing a flicker component that may be included in the power output to the power output terminal 202 is disposed at the rear end of the secondary rectification circuit 271. To this end, the flicker removal circuit 272 may include a diode D3_T2, capacitors CC2_T2, CC3_T2, resistor R20, and ICs U1_T2 and U2_T2.

The oscillation circuit 240 oscillates a rectified and smoothed DC voltage according to a control signal. To this end, when input power is supplied, the oscillator circuit 240 is turned on to an appropriate supply voltage to the IC, and accordingly, it supplies power to the secondary by switching the main voltage by giving a signal to the gate of the FET (Q1), which is a switch component.

When the driving voltage is supplied from the transformer circuit 230 to the power supply terminal 8, the control circuit 250 outputs a control signal to the transformer circuit 230 and the oscillation circuit 240 for driving control, and the driving voltage is supplied. If not, it includes a control IC 251 that is stopped driving. As the control IC (U1), an OB3330 IC device manufactured by Ombrite Inc. may be used.

The overvoltage protection circuit 260 is a protection circuit that selectively drives the control IC 251 according to the rectified and smoothed DC voltage, and the rectified and smoothed DC voltage is a normal voltage of 220V as shown in FIG. On the back side, the driving voltage of the transformer circuit 230 is supplied to the power supply terminal 8 of the control IC 251, and if the rectified and smoothed DC voltage is an overvoltage of 380V as shown in FIG. 5, the power supply terminal The driving voltage of the transformer circuit 230 supplied to (8) is grounded to be cut off.

To this end, the first resistors R21 and R7 and the second resistors R19 and the first resistors R21 and R7 and the second resistors are connected in series to the circuit line to which the DC and smoothed DC voltages are applied. A Zener diode (D6) having a cathode connected between the resistors (R19), and a base connected to the anode of the Zener diode (D6), and a collector from the transformer circuit 230 to the power supply terminal 8 of the control IC 251 ) Is connected to a circuit line to which the driving voltage is applied, and the emitter is composed of a circuit including a switching element Q2 connected to the ground terminal GND. In this way, the overvoltage protection function can be implemented with a simple circuit configuration using relatively inexpensive circuit components such as resistors, zener diodes, and switching devices, thereby reducing manufacturing cost.

Here, the drawing illustrates that a transistor is used as the switching device Q2, but is not limited thereto. A switching device such as FET, thyristor, and triac that selectively operates to conduct a circuit according to an applied driving voltage may be used. have.

Meanwhile, as shown in FIG. 4, the overvoltage protection circuit 260 is provided between the anode of the Zener diode D6 and the ground terminal GND, and more specifically, the anode and the switching device ( By further including a capacitor (EC4) connected to the circuit line to which the base of Q2) is connected to the + side and to the circuit line to which the emitter of the Zener diode (D6) and the ground terminal (GND) are connected, the capacitor (EC4) is further included. By smoothing the driving voltage applied to the base of the switching device Q2 through the diode D6, it is possible to prevent the switching device Q2 from malfunctioning as a non-uniform driving voltage is applied to the base of the switching device Q2. have.

Next, with reference to FIGS. 3 to 5 will be described the operating principle of the LED luminaire equipped with an auto-recovery type 380V overvoltage protection function according to a preferred embodiment of the present invention.

First, when the DC voltage rectified and smoothed through the rectifier circuit 220 as shown in FIGS. 3 and 4 is 220V, the DC voltage of 220V applied to the overvoltage protection circuit 260 is the first resistors R21 and R7. And a second resistor (R19) and applied to the cathode of the zener diode (D6), the zener diode (D6) is 220V divided by the first resistors (R21, R7) and the second resistor (R19). Since it is designed to have a higher Zener voltage than the voltage, the circuit connected to the base of the switching element Q2 is cut off by the Zener diode D6, so that the switching element Q2 does not conduct.

In addition, when a DC voltage of 220V is applied to the transformer circuit 230, the auxiliary coil (VCC-T1-A) of the transformer circuit 230 is excited by the secondary transformer (T2-B), and the control circuit 250 is controlled. A driving voltage for driving the IC 251 is output, and the output driving voltage is supplied to the power supply terminal 8 of the control IC 251 through a resistor R10 and a diode SD1, and the control IC 251 ) Is normally driven and outputs a control signal to the transformer circuit 230 and the oscillation circuit 240 so that the LED module 100 drives light emission.

On the other hand, when the DC voltage rectified and smoothed through the rectifier circuit 220 as shown in FIGS. 3 and 5 is 380V due to incorrect connection or disconnection of the neutral wire during wiring, the overvoltage protection circuit 260 The applied DC voltage of 380V is distributed by the first resistors R21 and R7 and the second resistor R19 to be applied to the cathode of the Zener diode D6, and the Zener diode D6 has 380V as the first resistor ( Since it is designed to have a relatively smaller Zener voltage than the voltage divided by R21, R7) and the second resistor (R19), the voltage is applied in the reverse direction through the Zener diode (D6) and the driving voltage is applied to the base of the switching device (Q2). Is authorized.

Accordingly, the driving voltage output from the secondary transformer (T2-B) of the transformer circuit 230 is output to the ground terminal (GND) through the switching device (Q2) as the collector and the emitter of the switching device (Q2) are conducted. As it is grounded and cut off, the driving voltage is not supplied to the power supply terminal 8 of the control IC 251, and the control IC 251 stops driving, and a control signal is input to the transformer circuit 230 and the oscillation circuit 240. As a result, the LED module 100 is not driven.

In this way, if the rectified and smoothed DC voltage is an overvoltage of 380V, the driving voltage of the transformer circuit 230 supplied to the power supply terminal 8 is grounded and cut off, thereby preventing damage or failure of circuit components due to the overvoltage. Can be prevented.

Thereafter, when the erroneous connection or disconnection of the neutral line is restored and 220V commercial power is applied to the overvoltage protection circuit 260, the circuit connected to the base of the switching device Q2 is cut off by the zener diode D6, and the switching device Q2 ) Is not conducted and a DC voltage of 220V is applied to the transformer circuit 230, the auxiliary coil (VCC-T1-A) of the transformer circuit 230 is excited by the secondary transformer (T2-B) and the control circuit ( A driving voltage for driving the control IC 251 of 250 is output, and the output driving voltage is supplied to the power supply terminal 8 of the control IC 251 through a resistor R10 and a diode SD1, While the control IC 251 is normally driven, a control signal is output to the transformer circuit 230 and the oscillation circuit 240 so that the LED module 100 drives light emission.

As described above, when a commercial power of 220V is normally applied in a situation where 380V is applied, a driving voltage is automatically supplied to the control IC 251 without any separate manipulation or setting change, thereby implementing a function of normal driving.

The present invention described above is not limited by the above-described embodiments and the accompanying drawings, and various substitutions, modifications and changes are possible within the scope of the technical spirit of the present invention. It will be obvious to those of knowledge.

1...LED lighting fixture with automatic reset type 380V overvoltage protection function
100...LED module 200...Power supply circuit module
210... filter circuit 220... rectifier circuit
230...Trans circuit 240...Oscillation circuit
250...control circuit 260...overvoltage protection circuit

Claims (3)

In the LED lighting equipment equipped with an auto-return type 380V overvoltage protection function in which commercial power is supplied by a 3-phase 4-wire Y-wire distribution method,
LED module 100 for driving light when the driving power is supplied; And a power supply circuit module 200 receiving commercial power and converting it into a form of LED driving power and supplying it to the LED module 100;
The power supply circuit module 200 includes a filter circuit 210 that filters and stabilizes the voltage of the three-phase AC power input through the three-phase line to the power input terminal 201, and rectifies the stabilized AC voltage to a DC voltage. And a rectifier circuit 220 for smoothing and rectification, and a transformer circuit 230 for converting the rectified and smoothed DC voltage to the size of the set voltage according to the input control signal and outputting it to the power output terminal 202 to which the LED module 100 is connected. ), and an oscillation circuit 240 for oscillating a rectified and smoothed DC voltage according to a control signal, and when a driving voltage is supplied from the transformer circuit 230 to the power supply terminal 8, the transformer circuit 230 and the oscillation circuit If the control circuit 250 including a control IC 251 that outputs a control signal to 240 for driving control and stops driving when the driving voltage is not supplied, and the rectified and smoothed DC voltage is a normal voltage of 220V, A transformer circuit supplied to the power supply terminal 8 when the drive voltage of the transformer circuit 230 is supplied to the power supply terminal 8 of the control IC 251 and the rectified and smoothed DC voltage is an overvoltage of 380V. Including an overvoltage protection circuit 260 for blocking by grounding the driving voltage of 230,
The overvoltage protection circuit 260 includes a first resistor (R21, R7) and a second resistor (R19) connected in series to a circuit line to which the DC and smoothed DC voltages are applied, and the first resistor (R21). A Zener diode (D6) having a cathode connected between R7 and a second resistor (R19), and a base connected to the anode of the Zener diode (D6), and a collector from the transformer circuit 230 to the control IC 251 It is connected to the circuit line to which the driving voltage is applied to the power supply terminal (8) of, and the emitter includes a switching device (Q2) connected to the ground terminal (GND),
Circuit components included in the filter circuit 210 and the rectifier circuit 220 are provided to have a breakdown voltage capable of withstanding an overvoltage of 380V,
The transformer circuit 230 is composed of a primary transformer and a secondary transformer (T2-B), and the primary transformer is a power supply that oscillates to induce the applied voltage to the secondary transformer (T2-B). It includes a coil (DRAIN-T1-A) and an auxiliary coil (VCC-T1-A) as an oscillation stage source, and the auxiliary coil (VCC-T1-A) is a power supply terminal of the control IC (U1, 251) ( When the circuit is connected to 8) and is excited by the secondary transformer (T2-B), a driving voltage is applied to the power supply terminal 8 so that the control IC 251 can be driven. LED lighting equipment with protection function.
delete The method according to claim 1,
The overvoltage protection circuit 260,
The positive side is connected to the circuit line where the anode of the Zener diode D6 and the base of the switching device Q2 are connected, and the negative side is connected to the circuit line to which the emitter of the Zener diode D6 and the ground terminal GND are connected. An LED lighting fixture with an auto-recovery type 380V overvoltage protection function, characterized in that it further comprises a capacitor (EC4) that is connected and smoothes the driving voltage applied to the base of the switching device (Q2) through the zener diode (D6).

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