KR20170129410A - Illuminating apparatus using light emitting elements - Google Patents

Abstract

The present disclosure relates to a lighting device of a semiconductor light emitting element, which comprises: the n number of semiconductor light emitting element groups (n>=3) for sequentially emitting light in accordance with a change in voltage of power connected in series to be supplied; an (n-2)^th current path routed from an (n-2)^th semiconductor light emitting element group to an (n-1)^th semiconductor light emitting element group; an (n-1)^th current path routed from the (n-1)^th semiconductor light emitting element group to an n^th semiconductor light emitting element group; a bypass current path branched from the (n-2)^th current path to bypass the (n-1)^th semiconductor light emitting element group; an (n-1)^th switch positioned on the (n-1)^th current path, and operated to allow current passing through the (n-1)^th semiconductor light emitting element group to flow a ground without passing through the n^th semiconductor light emitting element group; and a control switch for turning on and off an electrical connection of the bypass current path, and the n^th semiconductor light emitting element group, and turning off the electrical connection when the supplied voltage of the power is at a value capable of emitting all the (n-1)^th and n^th semiconductor light emitting element groups.

Description

TECHNICAL FIELD [0001] The present invention relates to a semiconductor light-

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates generally to a semiconductor light-emitting device illumination device, and more particularly to a semiconductor light-emitting device illumination device that sequentially emits light in response to a change in the voltage of a power source to be supplied. Here, the semiconductor light emitting device means a semiconductor optical device such as an LED or a laser diode. It goes without saying that a phosphor may be used in combination with such a semiconductor light emitting device.

FIG. 1 is a diagram showing an example of a conventional semiconductor light emitting device illumination device using an AC power source. The illumination device includes an AC power source 100, a resistor 110 for controlling the voltage of the AC power source 100, And LEDs 120 and 130 connected in parallel. The LED 120 emits light when a positive current flows, and the LED 130 emits light when a negative current flows.

2 is a view showing another example of a conventional semiconductor light emitting device lighting apparatus using an alternating current power source, which includes a rectifying circuit 310, a switching mode power supply 320 (SMPS) including a transformer, A light emitting portion 340 having an LED array 330 connected in series, and an electromagnetic interference (EMI) filter 350. Mode power supply 320 to convert the power supply to a suitable form and drive the light emitting unit 340.

3 and 4 are diagrams showing an example of a semiconductor light emitting device lighting apparatus using an AC power source as disclosed in U.S. Patent Application Publication No. 2010-0194298. The light emitting device 600 includes a rectifying circuit 610, a control circuit 620 ), And a plurality of LED groups 631, 632, 633, 634, and 635 connected in series. The control circuit 620 has switches Q1, Q2, Q3, Q4, Q5 and Q6 for controlling the respective LED groups 631, 632, 633, 634 and 635 to emit light. When the voltage reaches the time T1 and the voltage 20V for turning on the LED group 631, the switch Q1 is kept in the ON state and the current through the LED group 631 is supplied to the switch Q1 Thereby causing the LED group 631 to emit light at a voltage between 20V and 40V. The switch Q1 is turned off and the switch Q2 is kept in the On state when the time T2 and the voltage 40V for turning on the LED group 631 and the LED group 632 are reached and the LED group 631 And the LED group 632 conducts through the switch Q2 so that the LED group 631 and the LED group 632 emit light at a voltage between 40V and 60V. In the same manner, light up to the LED group 635 is emitted, and when the voltage decreases, the light emission is sequentially reduced by turning the switch on / off. Such a lighting apparatus has an advantage that the entire rectified current can be used for light emission of the light emitting element.

FIGS. 5 to 9 are diagrams showing various examples of the semiconductor light emitting device illumination device disclosed in U.S. Patent No. 7,439,944, wherein a switch is provided between the LED groups to detect a change in voltage and turn on / off the switch accordingly There are various ways to be able to do this.

This will be described later in the Specification for Implementation of the Invention.

SUMMARY OF THE INVENTION Herein, a general summary of the present disclosure is provided, which should not be construed as limiting the scope of the present disclosure. of its features).

According to one aspect of the present disclosure, in a semiconductor light emitting device lighting apparatus, n semiconductor light emitting element groups (hereinafter referred to as " n " (n? 3); an (n-2) th current path from the (n-2) th semiconductor light emitting element group to the (n-1) th semiconductor light emitting element group; an (n-1) th current path from the (n-1) th semiconductor light emitting element group to the nth semiconductor light emitting element group; a bypass current path branched from the (n-2) th current path and bypassing the (n-1) th semiconductor light emitting element group; an n-1 < th > switch located on an (n-1) -th current path and operable to flow current passing through an (n-1) -th semiconductor light emitting element group to ground without passing through an n-th semiconductor light emitting element group; Then, the electrical connection between the bypass current path and the n-th semiconductor light emitting element group is turned on and off, and the voltage of the supplied power source can emit both the n-1th semiconductor light emitting element group and the n- And a control switch for turning off an electrical connection when the current value is in a predetermined value.

This will be described later in the Specification for Implementation of the Invention.

1 is a view showing an example of a conventional semiconductor light emitting device illumination device using an AC power source,
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a semiconductor light emitting device,
FIGS. 3 and 4 are views showing an example of a semiconductor light emitting device lighting device using an AC power source as disclosed in U.S. Patent Application Publication No. US2004 /
5 to 9 are diagrams showing various examples of the semiconductor light emitting device illumination device disclosed in U.S. Patent No. 7,439,944,
10 is a view showing an example of a semiconductor light emitting device illumination device according to the present disclosure,
11 to 13 are diagrams for explaining an example of the operation of the semiconductor light emitting device illumination apparatus according to the present disclosure;

Hereinafter, the present invention will be described in detail with reference to the drawings attached hereto. (The present disclosure will be described in detail with reference to the drawing (s)).

10 is a diagram showing an example of a semiconductor light emitting device illumination apparatus according to the present disclosure, in which the semiconductor light emitting device illumination apparatus includes four semiconductor light emitting element groups 11, 12, 13, and 14, four current paths 21 and 22 The control circuit 35 and the control circuit 40 and the cutoff means 50. The control circuit 35 is connected to the control circuit 40, .

The four semiconductor light emitting element groups 11, 12, 13, and 14 may be LEDs, and each of the semiconductor light emitting element groups 11, 12, 13, and 14 may include at least one LED. The semiconductor light emitting device lighting apparatus according to the present disclosure may be composed of n groups (n? 3), and the (n-1) th semiconductor light emitting element group and the nth semiconductor light emitting element group may be LEDs are preferable.

In the four current paths 21, 22, 23 and 24, the first current path 21 is connected from the first semiconductor light-emitting element group 11 to the second semiconductor light-emitting element group 12, And the second current path 22 is connected from the second semiconductor light emitting element group 12 to the third semiconductor light emitting element group 13 so as to electrically connect the two and the third current path 23, The fourth current path 24 is connected to the fourth semiconductor light emitting element group 14 from the third semiconductor light emitting element group 13 to the fourth semiconductor light emitting element group 14, (Not shown). When n (n? 3) semiconductor light emitting element groups are provided, n current paths corresponding thereto may be provided.

The bypass current path 25 is a current path branched from the second current path 22 and bypassing the third semiconductor light emitting element group 13. When n (n? 3) semiconductor light emitting element groups are provided, the bypass current path 25 is branched from the (n-2) th current path to bypass the (n-1) th semiconductor light emitting element group.

In the four switches 31, 32, 33, and 34, the first switch 31 is located on the first current path 21, and the current passing through the first semiconductor light- (Not shown) without passing through the element group 12 and the second switch 32 is located on the second current path 22 so that the second semiconductor light emitting element group 12 can be operated to flow to the ground (Not shown) without passing through the third semiconductor light emitting element group 13, and the third switch 33 is located on the third current path 23, (Not shown) without passing through the fourth semiconductor light emitting element group 14 and the fourth switch 34 can operate to flow through the fourth current path (not shown) 24 to turn on the fourth current path 24 to turn off the fourth semiconductor light emitting element group 14 It may operate so that the current flows to the ground (not shown), and may be omitted when the amount of current adjustment is not necessary. When n (n? 3) semiconductor light emitting element groups are provided, n switches may be provided corresponding thereto, and the nth switch may be omitted.

The control switch 35 turns on and off the electrical connection between the bypass current path 25 and the fourth semiconductor light emitting element group 14 so that the voltage of the supplied power supply 1 is lower than the voltage of the third semiconductor light emitting element group 13 The electrical connection can be turned off when the fourth semiconductor light emitting element group 14 is at a value capable of emitting light. When n (n? 3) semiconductor light emitting element groups are provided, the control switch 35 turns on and off the electrical connection between the bypass current path and the nth semiconductor light emitting element group, and the voltage The electrical connection can be turned off when the (n-1) -th semiconductor light emitting element group and the (n) th semiconductor light emitting element group are at a value capable of emitting light. The power source 1 is rectified through a rectifier circuit (not shown) such as a bridge diode and supplied to the four semiconductor light emitting element groups 11, 12, 13, and 14.

The bypass switch 36 may be provided separately from the fourth switch 34 so that the current passing through the fourth semiconductor light emitting element group 14 flows when the electrical connection is on (when the control switch 35 is turned on) . When n (n? 3) semiconductor light emitting element groups are provided, they are provided on the nth current path.

The control circuit 40 (e.g., an IC circuit) controls the overall operation of the semiconductor light emitting device illumination device according to the present disclosure and controls the current flowing through the four current paths 21, 22, 23, 24 and the bypass current path 25 Lt; / RTI > The control circuit 40 may include four switches 31, 32, 33, and 34 as a part thereof.

The blocking means 50 is provided on the third current path 23 to block the current passing through the bypass current path 25 from flowing to the third semiconductor light emitting element group 13. When n (n? 3) semiconductor light emitting element groups are provided, the current passing through the bypass current path 25 is prevented from flowing into the (n-1) th semiconductor light emitting element group. For example, the switch structure of the type shown in Fig. 5 can be used as the structure of four switches 31, 32, 33, and 34 and the bypass switch 36 (transistor switch, OP-amp, sensing resistance). The control switch 35 may be composed of transistors such as a BJT, a JFET, and a MOSFET. Since the blocking means 50 is effective only in the direction opposite to the flow of the main current, it can be implemented using a unidirectional diode. For example, a Schottky diode with a small forward turn-on voltage can be used. The larger the forward turn-on voltage is, the larger the turn-on mismatch between the third semiconductor light-emitting element group 13 and the fourth semiconductor light-emitting element group 14 becomes, which negatively affects the luminous efficiency.

11 to 13 are diagrams for explaining an example of the operation of the semiconductor light emitting device lighting apparatus according to the present disclosure. As shown in FIG. 11, when the voltage of the supplied power supply 1 rises and the time T1 The first switch 31 (ID1; see FIG. 10) is kept in the ON state, and the first semiconductor light emitting element group 11 emits light, as shown in FIG.

When the time T2 is reached, the second switch 32 (ID2) is in the ON state and the first switch 31 (ID1) is in the OFF state, so that the first semiconductor light emitting element group 11 and the second semiconductor light emitting element 11 The element group 12 emits light.

When the time T3 is reached, the third switch 33 (ID3) is in the ON state and the first switch 31 (ID1) and the second switch 32 (ID2) are in the OFF state, The group 11, the second semiconductor light-emitting element group 12, and the third semiconductor light-emitting element group 13 emit light, and a current flows in the path Path 1. If the control switch 35 and the detour switch 35 (ID3 ') are in the On state (the detour switch 35 (ID3') is not separately provided, the control switch 35 and the fourth switch 34 ; ID4) is in the ON state), the fourth semiconductor light emitting element group 14 also emits light, and current flows in the path Path 2.

When the fourth switch 34 (ID4) is in the On state and the first switch 31 (ID1), the second switch 32 (ID2) and the third switch 33 (ID3) are in the Off state The first semiconductor light emitting element group 11, the second semiconductor light emitting element group 12, the third semiconductor light emitting element group 13 and the fourth semiconductor light emitting element group 14 emit light, 3). When the control switch 35 and the detour switch 35 (ID3 ') are in the Off state (the detour switch 35 (ID3') is not separately provided, the control switch 35 is in the Off state ).

As the voltage falls, the four semiconductor light emitting element groups 11, 12, 13 and 14 stop emitting light.

When the four switches 31, 32, 33 and 34 and the bypass switch 36 are initially in the ON state, the first switch 31 (ID1) is switched to the second switch 32 (ID2) The second switch 32 (ID2) can be turned off by receiving the current or voltage information S2 flowing to the third switch 33 (ID3), and the third switch 33 The switch 33 (ID3) and the bypass switch 36 (ID3 ') can be turned off by receiving current or voltage information S3 and S4 flowing to the fourth switch 34 (ID4). On the other hand, when the third semiconductor light emitting element group 13 emits light, the control circuit 40 can turn on the control switch 35 by receiving current or voltage information S5 of the third current path 23, The control switch 35 can be turned off by receiving the current or voltage information S6 flowing through the fourth current path 24. Detection of voltage and current of the input power source 1, detection of voltage and current on each current path, on-off timing control of each switch, and the like are well known techniques. As shown in FIGS. 3 to 9 And various related technologies are disclosed in U.S. Patent Application Publication No. 2010-0194298 and U.S. Patent No. 7,439,944.

13, the value of the current flowing through the third semiconductor light-emitting element group 13 and the current flowing through the fourth semiconductor light-emitting element group 14 in the section starting from the time T2 are Are controlled by the control circuit 40 so as to have a value smaller than the value of the current to be inputted respectively and preferably set to be one half of the value of the input current so that the third semiconductor light emitting element group 13 and the fourth When the semiconductor light-emitting element groups 14 have the same number of semiconductor light-emitting elements or the same driving voltage, they have the same optical output and can reduce the light emission deviation. In addition, when driven at high power, the amount of current flowing through the third semiconductor light emitting element group 13 and the fourth semiconductor light emitting element group 14 can be reduced in a section starting from the time T2, The light output droop of the light emitting element can be reduced.

Various embodiments of the present disclosure will be described below.

(1) In a semiconductor light emitting device lighting device, n semiconductor light emitting device groups (n? 3) sequentially emitting light in accordance with a change in the voltage of a power supply connected in series; an (n-2) th current path from the (n-2) th semiconductor light emitting element group to the (n-1) th semiconductor light emitting element group; an (n-1) th current path from the (n-1) th semiconductor light emitting element group to the nth semiconductor light emitting element group; a bypass current path branched from the (n-2) th current path and bypassing the (n-1) th semiconductor light emitting element group; an n-1 < th > switch located on an (n-1) -th current path and operable to flow current passing through an (n-1) -th semiconductor light emitting element group to ground without passing through an n-th semiconductor light emitting element group; Then, the electrical connection between the bypass current path and the n-th semiconductor light emitting element group is turned on and off, and the voltage of the supplied power source can emit both the n-1th semiconductor light emitting element group and the n- And a control switch for turning off an electrical connection when the voltage is at a predetermined value.

(2) When the electrical connection is on, the value of the current flowing through the (n-1) th semiconductor light emitting element group and the value of the current flowing through the nth semiconductor light emitting element group are controlled to be smaller than the value of the input current And a control circuit for controlling the semiconductor light emitting device.

(3) a detour switch through which an electric current passes through an n-th semiconductor light emitting element group when an electrical connection is turned on.

(4) When the electrical connection is on, the value of the current flowing through the (n-1) th semiconductor light emitting element group and the value of the current flowing through the nth semiconductor light emitting element group have a value of 1/2 And a control circuit for controlling the semiconductor light emitting device.

(5) blocking means located on the (n-1) th current path so as to block the current passing through the bypass current path from flowing into the (n-1) th semiconductor light emitting element group.

(6) a control circuit for controlling the current flowing through the n-th semiconductor light-emitting element group to have a larger value when the electrical connection is off than the value of the current flowing through the n-th semiconductor light-emitting element group when the electrical connection is on; Wherein the semiconductor light emitting device is a semiconductor light emitting device.

(7) When the electrical connection is on, the (n-1) th semiconductor light emitting element group and the (n) th semiconductor light emitting element group are connected in parallel, and when the electrical connection is off, Are connected in series.

(8) the bypass current path includes blocking means located on the (n-1) th current path so as to block the current flowing into the (n-1) th semiconductor light emitting element group.

According to one semiconductor light emitting device lighting apparatus of the present disclosure, a plurality of semiconductor light emitting element groups can be sequentially emitted according to a change in the voltage of a power source to be supplied.

According to another semiconductor light emitting device lighting apparatus according to the present disclosure, even when the voltage of the AC power source is not constant, the nth semiconductor light emitting element group can be used for light emission.

According to another semiconductor light emitting device lighting apparatus according to the present disclosure, droop phenomenon of the semiconductor light emitting device can be prevented and light efficiency can be improved even when high power is used.

According to another semiconductor light emitting device lighting apparatus according to the present disclosure, by controlling the amount of current supplied to the n-1 < th > semiconductor light emitting element group and the n < th > semiconductor light emitting element group to be smaller than the input current amount, . This is possible by independently forming the current flow path of the (n-1) th semiconductor light emitting element group and the current flow path of the nth semiconductor light emitting element group.

The current paths 21, 22, 23 and 24, the bypass current path 25, the switches 31, 32, 33 and 34, the control switch 35, The bypass switch 36, the control circuit 40, the blocking means 50,

Claims (10)

In a semiconductor light emitting device illumination device,
N semiconductor light emitting element groups (n > = 3) sequentially emitting light in accordance with a change in voltage of a power supply connected in series;
an (n-2) th current path from the (n-2) th semiconductor light emitting element group to the (n-1) th semiconductor light emitting element group;
an (n-1) th current path from the (n-1) th semiconductor light emitting element group to the nth semiconductor light emitting element group;
a bypass current path branched from the (n-2) th current path and bypassing the (n-1) th semiconductor light emitting element group;
an n-1 < th > switch located on an (n-1) -th current path and operable to flow current passing through an (n-1) -th semiconductor light emitting element group to ground without passing through an n-th semiconductor light emitting element group; And,
The on-off current path and the n-th semiconductor light emitting element group are turned on and off, and the voltage of the power supply is set to a value capable of emitting both the n-1th semiconductor light emitting element group and the nth semiconductor light emitting element group And a control switch for turning off an electrical connection when the semiconductor light emitting device is turned on. The method according to claim 1,
A control circuit for controlling the value of the current flowing through the (n-1) th semiconductor light emitting element group and the value of the current flowing through the nth semiconductor light emitting element group to be smaller than the value of the input current when the electrical connection is on, And a light emitting diode (LED). The method of claim 2,
And a detour switch through which the current passing through the n-th semiconductor light emitting element group flows when the electrical connection is turned on. The method according to claim 1,
When the electrical connection is on, control is performed such that the value of the current flowing through the (n-1) th semiconductor light emitting element group and the value of the current flowing through the nth semiconductor light emitting element group have 1/2 of the value of the input current And a control circuit for controlling the operation of the semiconductor light emitting device. The method according to claim 1,
And a blocking means located on the (n-1) th current path so as to block the current passing through the bypass current path from flowing into the (n-1) th semiconductor light emitting element group. The method according to claim 1,
And a control circuit for controlling the value of the current flowing through the n-th semiconductor light-emitting element group when the electrical connection is off, to be larger than the value of the current flowing through the n-th semiconductor light-emitting element group when the electrical connection is on Wherein the semiconductor light emitting device is a semiconductor light emitting device. The method of claim 6,
The control circuit controls the value of the current flowing through the (n-1) th semiconductor light emitting element group and the value of the current flowing through the nth semiconductor light emitting element group to be smaller than the value of the input current when the electrical connection is on Wherein the semiconductor light emitting device is a semiconductor light emitting device. The method according to claim 1,
When the electrical connection is on, the (n-1) -th semiconductor light-emitting element group and the n-th semiconductor light-emitting element group are connected in parallel, and when the electrical connection is off, the n- Wherein the semiconductor light-emitting device illuminates the semiconductor light-emitting device. The method of claim 7,
When the electrical connection is on, the (n-1) -th semiconductor light-emitting element group and the n-th semiconductor light-emitting element group are connected in parallel, and when the electrical connection is off, the n- Wherein the semiconductor light-emitting device illuminates the semiconductor light-emitting device. The method of claim 9,
And the blocking current path is located on the (n-1) th current path so as to block the current from flowing into the (n-1) th semiconductor light emitting element group.

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