WO2010056004A2 - Current balance circuit for efficiently driving an led light and lamp - Google Patents

Abstract

The present invention relates to a current balance circuit for efficiently driving an LED light and lamp. The current balance circuit of the present invention comprises: a current driving source for supplying a current; a plurality of LEDs arranged in parallel; and one or more mutual inductance coils which receive current from the current driving source, and supply the same current to the plurality of LEDs by the mutual inductance of a primary coil and a secondary coil which have the same number of turns. Alternatively, the current balance circuit of the present invention comprises: a current driving source for supplying a current; a plurality of LEDs arranged in parallel; and one or more mutual inductance coils which receive current via the LEDs and render the current flowing through the LEDs the same by the mutual inductance of a primary coil and a secondary coil which have the same number of turns. Whereby, the present invention controls the current applied to each of the LEDs to be the same during the serial or parallel driving of the LEDs when manufacturing a light or a lamp using LED elements, thus producing LEDs with improved reliability, long lifespan, and maximized efficiency, and reducing manufacturing costs for an LED driving circuit.

Description

Current Balance Circuit for Efficient Driving of LED Lights and Lamps

The present invention relates to a current balance circuit for efficient driving of LED lighting and lamp, and more particularly to a current balance circuit for efficient driving of LED lighting and lamp which reduces the current deviation applied to the LED lighting and the LED element in the lamp. It is about.

When the LED devices are configured in parallel in the lighting and lamps composed of LEDs, which are current driving devices, current deviation occurs in each LED device configured in parallel due to the deviation caused by the Vf (LED forward voltage) error between the LEDs. 2 is shown. As shown in Fig. 1 and Fig. 2, the current deviation between each LED configured in parallel is slightly different for each LED manufacturer, but as shown in this experiment, it can be seen that the maximum forward current increases by about 92.8% compared to the minimum forward current. . For this reason, when comparing the power applied to the LED device is shown in Equation 1 and Equation 2.

Equation 1

Equation 2

When LED devices are driven in parallel as described above, the amount of forward current varies greatly between LED devices due to the difference in the forward voltage between the LEDs. Therefore, the power required for each LED is changed, resulting in a high heat generation of the LED devices. This increases the LED lifespan and reduces the light efficiency.

Conventional technology to solve this problem is to configure the LED elements in series instead of parallel type to control the constant current or to control the current of each parallel LED element. The construction method is the same as FIG. 3 and FIG.

However, when the LED is driven in the same way, when one of the LEDs connected in series fails, the entire LED cannot be driven and the LED driving voltage becomes high. In addition, in the case of driving in parallel as shown in FIG. 4, the circuit manufacturing cost increases and the efficiency is lowered due to the heat generation of the current control device.

The present invention has been proposed to solve the above technical problem, and an object thereof is to provide a current balance circuit for efficient driving of LED lighting and lamps that can reduce the current deviation applied to the LED lighting and the LED elements in the lamp. .

In addition, another object of the present invention is to control the current applied to each LED in series and parallel operation of the LED when manufacturing the lamp and the lamp using the LED device to maximize the high reliability, long life and efficiency of the LED The purpose of the present invention is to provide a current balance circuit for driving LED lights and lamps efficiently, which can achieve and reduce the manufacturing cost of LED driving circuits.

In addition, another object of the present invention is to take advantage of the principle of mutual inductance of winding coils sharing the same magnetic field in the opposite direction to the same number of turns to maintain the current flowing to either side by the interaction To provide a current balance circuit for efficiently driving LED lighting and lamps that can control the current applied to each LED in series and parallel driving of LEDs.

As a means for solving the above-mentioned problems, the current balance circuit according to the present invention comprises: a current driving source for supplying current, as described in claim 1; A plurality of LEDs configured in parallel; And at least one mutual inductance coil receiving current from the current driving source and supplying the same current to the plurality of LEDs by the mutual inductance of the primary and secondary coils having the same number of turns.

As a means for solving the above-mentioned problems, the current balance circuit according to the present invention comprises: a current driving source for supplying current, as described in claim 2; A plurality of LEDs configured in parallel; And at least one mutual inductance coil receiving current through the LED to make the current flowing through the LED the same by the mutual inductance of the primary and secondary coils having the same number of turns.

The mutual inductance coil comprises: a first mutual inductance coil M1 supplied with the current, as described in claim 3; A second mutual inductance coil M2 connected to an output end of the primary coil of the first mutual inductance coil M1; And a third mutual inductance coil M3 connected to an output terminal of the secondary coil of the first mutual inductance coil M1.

The mutual inductance coil further includes a fourth mutual inductance coil M4 connected to an output terminal of the primary coil of the second mutual inductance coil M2 as described in claim 4. do.

The mutual inductance coil further includes a fifth mutual inductance coil M5 connected to the output terminal of the secondary coil of the third mutual inductance coil M3 as described in claim 5. do.

The mutual inductance coil includes a fourth mutual inductance coil M4 connected to an output end of the primary coil of the second mutual inductance coil M2, as described in claim 6; And a fifth mutual inductance coil M5 connected to the output terminal of the secondary coil of the third mutual inductance coil M3.

The mutual inductance coil includes a first mutual inductance coil M1 supplied with the current, as described in claim 7; A second mutual inductance coil M2 receiving the current; And a primary coil connected to a common output terminal of the primary and secondary coils of the first mutual inductance coil M1 and a secondary coil to a common output terminal of the primary and secondary coils of the second mutual inductance coil M2. And the connected third mutual inductance coil M3.

The mutual inductance coil further includes a fourth mutual inductance coil M4 connected to an input terminal of the primary coil of the first mutual inductance coil M1 as described in claim 8. do.

The mutual inductance coil further includes a fifth mutual inductance coil M5 connected to an output terminal of the secondary coil of the second mutual inductance coil M2, as described in claim 9. do.

The mutual inductance coil includes a fourth mutual inductance coil M4 connected to an input terminal of the primary coil of the first mutual inductance coil M1, as described in claim 10; And a fifth mutual inductance coil M5 connected to the output terminal of the secondary coil of the second mutual inductance coil M2.

The mutual inductance coil comprises: a first mutual inductance coil M1 supplied with the current, as described in claim 11; A second mutual inductance coil (M2) connected to an output terminal of the secondary coil of the first mutual inductance coil (M1); And a third mutual inductance coil M3 connected to an output terminal of the secondary coil of the second mutual inductance coil M2.

The mutual inductance coil includes a first mutual inductance coil M1 supplied with the current, as described in claim 12; A second mutual inductance coil M2 connected to an output end of the primary coil of the first mutual inductance coil M1; And a third mutual inductance coil M3 connected to the output terminal of the primary coil of the second mutual inductance coil M2.

According to the current balance circuit for efficient driving of LED lighting and lamp according to the present invention, the LED lighting is configured in a series and parallel form of the LED as the current driving element and the LED lighting by controlling the current flowing through each LED element in the same lamp And by extending the effective life of the lamp and by maximizing the heat dissipation through even heat distribution, there is an effect that can maximize the reliability and merchandise of the LED lighting and lamp.

In addition, there is an effect that can reduce the manufacturing cost of the driving circuit of the LED lighting and lamp.

In addition, it is possible to maximize the energy saving effect by using a relatively energy efficient LED as an alternative lighting and light source by supplementing the shortcomings of LED in the current situation where development of alternative energy and renewable energy is urgent.

1 is a circuit diagram of a conventional LED lighting and lamp in parallel

FIG. 2 is a graph showing current (I) and voltage (V) characteristics flowing through the LED light and lamp of FIG.

Figure 3 is a circuit diagram for controlling the constant current of the LED lights and lamps configured in a conventional series

Figure 4 is a circuit diagram for controlling the constant current of the LED light and lamp conventionally configured in parallel

5 to 18 is a current balance circuit diagram for efficient driving of LED lights and lamps according to the first to fourteenth preferred embodiments of the present invention.

19 is an experimental diagram of a current balance circuit according to the present invention.

20 is an experimental view of a LED driving circuit according to the prior art

21 is a waveform diagram measured during the experiment of the current balance circuit according to the present invention

22 is a waveform diagram measured during the experiment of the LED driving circuit according to the prior art

23 is an experimental result showing the current value measured in each LED before and after the application of the current balance circuit according to the present invention

The present invention utilizes the principle of mutual inductance as a current control method using a balance coil, and by winding the same number of turns in opposite directions to coils sharing the same magnetic field, the current flowing to either side is the same current. It is shown in Figure 5 in a way to maintain, it can be seen that it is proved as in Equations 3 to 5.

First, when the magnetic flux passing through the coil changes, the induced electromotive force is generated in a direction in which the coil current reduces the change in the magnetic flux. The size is expressed as follows.

(e = magnitude of electromotive force, N = number of coils wound,

Magnetic flux)

When the current flowing to the coil is changed, the magnetic flux passing through the coil is changed, and the induced electromotive force is generated in the direction of reducing the change of the magnetic flux by the magnetic flux. The magnitude is expressed as follows.

,

(L = self inductance, N = number of coils wound)

Changing the current in one of the two magnetically coupled coils generates induced electromotive force in the other coil. The size is expressed as follows.

Equation 3

(e ₂ = magnitude of electromotive force, M = mutual inductance, Δi ₁ = current flowing through the coil, N ₂ = number of turns of the coil,

Magnetic flux

Therefore, mutual inductance M is expressed as follows.

Equation 4

The mutual inductance (M ₁ ) produced by i1

The mutual inductance (M ₂ ) produced by i2 is

to be. Here, the same magnetic field is shared by N ₁ and N ₂ ,

And the expression is as follows.

Equation 5

In Equation 5, if N ₁ and N ₂ have the same number of turns,

It can be seen that the current becomes the same.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the embodiments of the present invention, the same reference numerals will be used for components having the same functions and functions.

First embodiment

FIG. 5 is a current balance circuit diagram for efficiently driving an LED light and a lamp according to the first preferred embodiment of the present invention.

As shown in Fig. 5, the current balance circuit of the first embodiment includes a current driving source 10 for supplying a current to a node Nd1 having one side connected to the node Nd4 having a ground potential (0V) and the other side connected thereto; An electromagnetic induction coil M with a primary coil connected between a node Nd1 and a node Nd2 and a secondary coil connected between the node Nd1 and a node Nd3 with the same number of turns as the primary coil, and the node Nd2; And a first LED (LED1) connected between and node Nd4, and a second LED (LED2) connected between node Nd3 and node Nd4.

As described above, the mutual inductance coil (M) uses the principle of operation of mutual inductance, and if the coils sharing the same magnetic field are wound with the same number of turns in opposite directions to each other, the current flowing to either side is caused by interaction. The same current is also maintained. That is, when the number of turns of the primary coil and the secondary coil is the same, the currents i ₁ and i ₂ flowing from the equation 5 to the first and second LEDs LED1 and LED2 are the same (

).

The present invention uses the same principle to reduce the power variation between the LED by flowing the current to the LEDs configured in parallel, respectively, to maximize the high reliability, long life and efficiency of the LED and also reduce the LED driving circuit manufacturing cost Can be.

Second embodiment

6 is a current balance circuit diagram for efficiently driving LED lights and lamps according to a second embodiment of the present invention.

As shown in Fig. 6, the current balance circuit of the second embodiment includes a current driving source 10 for supplying current to a node Nd1 having one side connected to the node Nd8 having a ground potential (0V) and the other side connected thereto; A first mutual inductance coil M1 in which a primary coil is connected between a node Nd1 and a node Nd2 and a secondary coil is connected between the node Nd1 and a node Nd3 with the same number of turns as the primary coil, and the node Nd2 and a node. Between the node Nd4 and the node Nd8, and the second mutual inductance coil M2, in which a primary coil is connected between Nd4 and a secondary coil is connected between the node Nd2 and the node Nd5 with the same number of turns as the primary coil. A connected first LED (LED1), a second LED (LED2) connected between the node Nd5 and the node Nd8, and a primary coil is connected between the node Nd3 and node Nd6 and between the node Nd3 and node Nd7 Secondary coil with the same number of turns as the primary coil The connected third mutual inductance coil M3, the third LED (LED3) connected between the node Nd6 and the node Nd8, and the fourth LED (LED4) connected between the node Nd7 and the node Nd8. It is composed.

As described above, in the second embodiment of the present invention, the second mutual inductance coil M2 and the third mutual inductance coil M3 are respectively provided at the output ends of the primary coil and the secondary coil of the first mutual inductance coil M1. And the LED lighting and the lamps LED1 to LED4 at the output ends of the primary coil and the secondary coil of the second and third mutual inductance coils M2 and M3.

Here, the first to third mutual inductance coils M1 to M3 have the same number of turns of the primary coil and the secondary coil. Accordingly, since the currents output from the primary coils and the secondary coils of the first to third mutual inductance coils M1 to M3 are the same as in Equation 5, the first to fourth LEDs LED1 to LED4. The same applies to the currents i _{1 to} i ₄ flowing in the furnace.

Third embodiment

FIG. 7 is a current balance circuit diagram for efficiently driving LED lights and lamps according to a third preferred embodiment of the present invention.

As shown in Fig. 7, the current balance circuit of the third embodiment includes a current driving source 10 for supplying current to a node Nd1 having one side connected to the node Nd8 having the ground potential (0V) and the other side connected thereto; The first LED (LED1) connected between the node Nd1 and the node Nd2, the second LED (LED2) connected between the node Nd1 and the node Nd3, and the primary coil is connected between the node Nd2 and the node Nd6 And a first mutual inductance coil M1 having a secondary coil connected between the node Nd3 and the node Nd6 with the same number of turns as the primary coil, and a third LED (LED3) connected between the node Nd1 and the node Nd4. And a fourth LED (LED4) connected between the node Nd4 and the node Nd5, and a primary coil is connected between the node Nd4 and the node Nd7 and the same number of turns as the primary coil between the node Nd5 and the node Nd7. A second mutual inductance coil M2 to which a secondary coil is connected; A primary coil is connected between the node Nd6 and the node Nd8, and a third mutual inductance coil M3 is connected between the node Nd7 and the node Nd8 with the same number of turns as the primary coil.

As described above, in the third embodiment of the present invention, the output current i ₁ + i ₂ of the primary coil and the secondary coil of the first mutual inductance coil M1 and the second mutual inductance coil M2. The output currents i ₃ + i ₄ of the primary coil and the secondary coil of are input to the primary coil and the secondary coil of the third mutual inductance coil M3, respectively, and the first and second mutual inductance coils LED lighting and lamps (LED1 to LED4) are formed at the input terminals of the primary and secondary coils of M1 and M2.

Here, the first to third mutual inductance coils M1 to M3 have the same number of turns of the primary coil and the secondary coil. Accordingly, since the currents output from the primary coils and the secondary coils of the first to third mutual inductance coils M1 to M3 are the same as in Equation 5, the first to fourth LEDs LED1 to LED4. The same applies to the currents i _{1 to} i ₄ flowing in the furnace.

Fourth embodiment

8 is a current balance circuit diagram for efficiently driving LED lights and lamps according to a fourth preferred embodiment of the present invention.

As shown in Fig. 8, the current balance circuit of the fourth embodiment includes a current driving source 10 for supplying a current to a node Nd1 having one side connected to the node Nd8 having a ground potential (0V) and the other side connected thereto; A first mutual inductance coil M1 in which a primary coil is connected between a node Nd1 and a node Nd2, and a secondary coil is connected between the node Nd1 and a node Nd3 with the same number of turns as the primary coil, and the node Nd1 and a node. Between the node Nd4 and the node Nd8, and the second mutual inductance coil M2, in which a primary coil is connected between Nd4 and a secondary coil is connected between the node Nd2 and the node Nd5 with the same number of turns as the primary coil. A connected first LED (LED1), a second LED (LED2) connected between the node Nd5 and the node Nd8, and a primary coil is connected between the node Nd3 and node Nd6 and between the node Nd1 and node Nd7 Secondary coil with the same number of turns as the primary coil The connected third mutual inductance coil M3, the third LED (LED3) connected between the node Nd6 and the node Nd8, and the fourth LED (LED4) connected between the node Nd7 and the node Nd8. It is composed.

As described above, in the fourth embodiment of the present invention, the current supplied from the current driving source 10 and the current output from the primary coil of the first mutual inductance coil M1 are converted into the second mutual inductance coil M2. The primary coil and the secondary coil of () are respectively input, and the current output from the primary coil of the first mutual inductance coil M1 and the current supplied from the current driving source 10 are the second mutual inductance coil. It is input to the primary coil and the secondary coil of (M2), respectively, and the LED lights and lamps (LED1 to ...) at the output terminals of the primary coil and the secondary coil of the second and third mutual inductance coils (M2) (M3). LED4) is configured.

Here, the first to third mutual inductance coils M1 to M3 have the same number of turns of the primary coil and the secondary coil as before. Accordingly, since the currents output from the primary coils and the secondary coils of the first to third mutual inductance coils M1 to M3 are the same as in Equation 5, the first to fourth LEDs LED1 to LED4. The same applies to the currents i _{1 to} i ₄ flowing in the furnace.

Fifth Embodiment

FIG. 9 is a current balance circuit diagram for efficiently driving LED lights and a lamp according to a fifth exemplary embodiment of the present invention.

As shown in Fig. 9, the current balance circuit of the fifth embodiment includes a current driving source 10 for supplying current to a node Nd1 having one side connected to the node Nd8 having a ground potential (0V) and the other side connected thereto; The first LED (LED1) connected between the node Nd1 and the node Nd2, the second LED (LED2) connected between the node Nd1 and the node Nd3, and the primary coil between the node Nd2 and the node Nd8 A first mutual inductance coil M1 connected between the node Nd3 and the node Nd6 with the same number of turns as the primary coil, and a third LED connected between the node Nd1 and the node Nd4 (LED3); ), A fourth LED (LED4) connected between the node Nd1 and the node Nd5, a primary coil is connected between the node Nd4 and the node Nd7, and the primary coil is connected between the node Nd5 and the node Nd8. Second mutual inductance coil M connected with secondary coils with the same number of turns 2) and a third mutual inductance coil M3 in which a primary coil is connected between the node Nd6 and the node Nd8 and a secondary coil is connected between the node Nd7 and the node Nd8 with the same number of turns as the primary coil. It is composed.

As described above, in the fifth embodiment of the present invention, the output current of the secondary coil of the first mutual inductance coil M1 and the output current of the primary coil of the second mutual inductance coil M2 are equal to each other. Input to the primary coil and the secondary coil of the mutual inductance coil M3, respectively, LED lighting and lamp (LED1) at the input terminal of the primary coil and the secondary coil of the first and second mutual inductance coils M1 and M2 LED4) is configured.

Here, the first to third mutual inductance coils M1 to M3 have the same number of turns of the primary coil and the secondary coil. Accordingly, since the currents output from the primary coils and the secondary coils of the first to third mutual inductance coils M1 to M3 are the same as in Equation 5, the first to fourth LEDs LED1 to LED4. The same applies to the currents i _{1 to} i ₄ flowing in the furnace.

Sixth embodiment

FIG. 10 is a current balance circuit diagram for efficiently driving LED lights and lamps according to a sixth preferred embodiment of the present invention.

As shown in Fig. 10, the current balance circuit of the sixth embodiment includes a current driving source 10 for supplying current to a node Nd1 having one side connected to the node Nd8 having the ground potential (0V) and the other side connected thereto; A first mutual inductance coil M1 in which a primary coil is connected between a node Nd1 and a node Nd2 and a secondary coil is connected between the node Nd1 and a node Nd3 with the same number of turns as the primary coil, and the node Nd2 and a node. Between the node Nd4 and the node Nd8, and the second mutual inductance coil M2, in which a primary coil is connected between Nd4 and a secondary coil is connected between the node Nd2 and the node Nd5 with the same number of turns as the primary coil. A connected first LED (LED1), a second LED (LED2) connected between the node Nd5 and the node Nd8, and a primary coil is connected between the node Nd3 and node Nd6 and between the node Nd3 and node Nd7 Secondary nose with the same number of turns as the primary coil The connected third mutual inductance coil M3, the third LED (LED3) connected between the node Nd6 and the node Nd8, and a primary coil are connected between the node Nd7 and the node Nd10, A fourth mutual inductance coil M4 having a secondary coil connected to the node Nd11 with the same number of turns as the primary coil, a fourth LED (LED4) connected between the node Nd10 and the node Nd8, and the node Nd11 And a fifth LED (LED5) connected between the node Nd8.

As described above, in the sixth embodiment of the present invention, the primary of the second and third mutual inductance coils M2 and M3 at the output terminals of the primary and secondary coils of the first mutual inductance coil M1, respectively. And an input terminal of the secondary coil is connected together, a primary coil of the fourth mutual inductance coil M4 is connected to an output terminal of the secondary coil of the third mutual inductance coil M3, and the second to fourth LED lighting and lamps LED1 to LED5 are formed at the output terminals of the primary and secondary coils of the mutual inductance coils M1 to M4.

Here, the first to fourth mutual inductance coils M1 to M4 have the same number of turns of the primary coil and the secondary coil as before. Accordingly, since the currents output from the primary coils and the secondary coils of the first to fourth mutual inductance coils M1 to M4 are the same as in Equation 5, the first to fifth LEDs LED1 to LED5. The same applies to the currents i _{1 to} i ₅ flowing in the furnace.

Seventh embodiment

FIG. 11 is a current balance circuit diagram for efficiently driving LED lights and lamps according to a seventh exemplary embodiment of the present invention.

As shown in Fig. 11, the current balance circuit of the seventh embodiment includes a current driving source 10 for supplying current to the node Nd1 having one side connected to the node Nd10 having the ground potential (0V) and the other side, and A first LED (LED1) connected between node Nd1 and node Nd2, a second LED (LED2) connected between node Nd1 and node Nd3, and a primary coil connected between node Nd2 and node Nd10. And a first mutual inductance coil M1 connected between the node Nd3 and the node Nd4 with the same number of turns as the primary coil, and a third LED (LED3) connected between the node Nd1 and the node Nd3. And a second mutual inductance coil M2 having a primary coil connected between the node Nd2 and a node Nd6 and a secondary coil connected between the node Nd5 and the node Nd6 with the same number of turns as the primary coil. Fourth LED (LED4) connected between node Nd1 and node Nd7 And a fifth LED (LED5) connected between the node Nd1 and the node Nd8, and a primary coil is connected between the node Nd7 and the node Nd9 and the same number of turns as the primary coil between the node Nd8 and the node Nd9. A third mutual inductance coil M3 to which a secondary coil is connected, and a primary coil is connected between the node Nd6 and the node Nd10, and the secondary coil has the same number of turns as the primary coil between the node Nd9 and the node Nd10. It consists of the 4th mutual inductance coil M4 with which the coil was connected.

As described above, in the seventh embodiment of the present invention, the input terminal of the primary coil and the secondary coil of the first mutual inductance coil M1 is connected to the output terminals of the LED lights and the lamps LED1 and LED2, Input terminals of the primary and secondary coils of the second mutual inductance coil M2 are connected to an output terminal of the secondary coil of the mutual inductance coil M1 and an output terminal of the LED lighting and the lamp LED3, and the second mutual inductance is connected. Primary coils and second coils of the fourth mutual inductance coil M4 at the output ends of the primary coil and the secondary coil of the coil M2 and the primary coil and the secondary coil of the third mutual inductance coil M3. Input terminals of the secondary coils are connected, and LED lights and lamps LED1 to LED5 are formed at the input terminals of the primary coils and the secondary coils of the first to third mutual inductance coils M1 to M3.

Here, the first to fourth mutual inductance coils M1 to M4 have the same number of turns of the primary coil and the secondary coil. Accordingly, since the currents output from the primary coils and the secondary coils of the first to fourth mutual inductance coils M1 to M4 are the same as in Equation 5, the first to fifth LEDs LED1 to LED5. The same also applies to the currents i _{1 to} i ₅ flowing in the furnace.

Eighth embodiment

12 is a current balance circuit diagram for efficiently driving LED lights and lamps according to an eighth preferred embodiment of the present invention.

As shown in Fig. 12, the current balance circuit of the eighth embodiment includes a current drive source 10 for supplying current to a node Nd1 having one side connected to the node Nd12 having a ground potential (0V) and connected to the other side; A first mutual inductance coil M1 having a primary coil connected between a node Nd1 and a node Nd2 and a secondary coil connected between the node Nd1 and a node Nd7 with the same number of turns as the primary coil, and the node Nd2 and a node; A second mutual inductance coil M2 having a primary coil connected between Nd3 and a secondary coil connected between the node Nd2 and a node Nd6 with the same number of turns as the primary coil, and between the node Nd7 and a node Nd8; A third mutual inductance coil M3 having a secondary coil connected thereto and a secondary coil connected between the node Nd7 and a node Nd9 with the same number of turns as the primary coil, and a fourth connected between the node Nd8 and the node Nd12; LED (LED4) and the node Nd2 A fourth mutual inductance coil M4 having a primary coil connected between the node Nd4 and a secondary coil connected between the node Nd3 and the node Nd5 with the same number of turns as the primary coil, and the node Nd4 and the node Nd12 A first LED (LED1) connected therebetween, a second LED (LED2) connected between the node Nd5 and the node Nd12, a third LED (LED3) connected between the node Nd6 and the node Nd12, A fifth mutual inductance coil M5 in which a primary coil is connected between the node Nd9 and the node Nd10 and a secondary coil is connected between the node Nd7 and a node Nd11 with the same number of turns as the primary coil, and the node Nd10 And a fifth LED (LED5) connected between the node Nd12 and a sixth LED (LED6) connected between the node Nd11 and the node Nd12.

As described above, in the eighth embodiment of the present invention, the second mutual inductance coil M2 and the third mutual inductance coil at both output ends of the primary coil and the secondary coil of the first mutual inductance coil M1. M3 is connected, and the fourth mutual inductance coil M4 is connected to the output terminal of the primary coil of the second mutual inductance coil M2, and the secondary coil of the third mutual inductance coil M3 is connected. The fifth mutual inductance coil M5 is connected to an output terminal, and LED lights and lamps LED1 to LED6 are respectively connected to the output terminals of the primary and secondary coils of the first to fifth mutual inductance coils M1 to M5. It is made up.

Here, the first to fifth mutual inductance coils M1 to M5 have the same number of turns of the primary coil and the secondary coil as before. Accordingly, since the currents output from the primary coils and the secondary coils of the first to fifth mutual inductance coils M1 to M5 are the same by the above Equation 5, the first to sixth LEDs LED1 to LED6. The same also applies to the currents i _{1 to} i ₆ flowing in the furnace.

9th embodiment

FIG. 13 is a current balance circuit diagram for efficiently driving LED lights and lamps according to a ninth preferred embodiment of the present invention.

As shown in Fig. 13, the current balance circuit of the ninth embodiment includes a current drive source 10 for supplying current to a node Nd1 having one side connected to the node Nd12 having a ground potential (0V) and the other side, and the A first LED (LED1) connected between node Nd1 and node Nd2, a second LED (LED2) connected between node Nd1 and node Nd3, and a primary coil connected between node Nd2 and node Nd4. And a first mutual inductance coil M1 connected between the node Nd3 and the node Nd5 with the same number of turns as the primary coil, and a third LED (LED3) connected between the node Nd1 and the node Nd6. And a second mutual inductance coil M2 having a primary coil connected between the node Nd5 and a node Nd4 and a secondary coil connected between the node Nd6 and the node Nd4 with the same number of turns as the primary coil. A fourth LED (LED4) connected between Nd1 and the node Nd7, and A fifth LED (LED5) connected between the node Nd1 and the node Nd8, a sixth LED (LED6) connected between the node Nd1 and the node Nd9, and a primary coil is connected between the node Nd8 and the node Nd10 And a third mutual inductance coil M3 connected between the node Nd9 and the node Nd11 with the same number of turns as the primary coil, and a primary coil connected between the node Nd7 and the node Nd11 and the node. A fourth mutual inductance coil M4 having a secondary coil connected to the same number of turns as the primary coil between Nd10 and the node Nd11, and a primary coil connected between the node Nd4 and the node Nd12, and the node Nd11 and the node; A fifth mutual inductance coil M5 is connected between the nodes Nd12 with a secondary coil connected to the same number of turns as the primary coil.

As described above, in the ninth embodiment of the present invention, the input terminal of the primary coil of the second mutual inductance coil M2 is connected to the output terminal of the secondary coil of the first mutual inductance coil M1, The input terminal of the secondary coil of the fourth mutual inductance coil M2 is connected to the output terminal of the primary coil of the third mutual inductance coil M3, and the primary and secondary coils of the second mutual inductance coil M2 are connected. Input terminals of the primary and secondary coils of the second mutual inductance coil M2 are connected to an output terminal and an output terminal of the primary and secondary coils of the fourth mutual inductance coil M4, and the first to fourth mutual LED lights and lamps LED1 to LED6 are formed at the output terminals of the primary and secondary coils of the inductance coils M1 to M4.

The first to fifth mutual inductance coils M1 to M5 have the same number of turns of the primary coil and the secondary coil. Accordingly, since the currents output from the primary coils and the secondary coils of the first to fifth mutual inductance coils M1 to M5 are the same by the above Equation 5, the first to sixth LEDs LED1 to LED6. The same also applies to the currents i _{1 to} i ₆ flowing in the furnace.

10th embodiment

14 is a current balance circuit diagram for efficiently driving LED lights and lamps according to a tenth preferred embodiment of the present invention.

As shown in Fig. 14, the current balance circuit of the tenth embodiment includes a current driving source 10 for supplying current to a node Nd1 having one side connected to the node Nd12 having a ground potential (0 V) and the other side connected thereto; A first mutual inductance coil M1 in which a primary coil is connected between a node Nd1 and a node Nd2 and a secondary coil is connected between the node Nd1 and a node Nd3 with the same number of turns as the primary coil, and the node Nd2 and a node. A second mutual inductance coil M2 having a primary coil connected between Nd4 and a secondary coil connected between the node Nd2 and a node Nd5 with the same number of turns as the primary coil, and between the node Nd3 and a node Nd8; A third mutual inductance coil M3 in which a secondary coil is connected and a secondary coil is connected between the node Nd3 and a node Nd9 with the same number of turns as the primary coil, and a primary coil is connected between the node Nd1 and a node Nd6. Node Nd4 and node Nd7 A fourth mutual inductance coil M4 having a secondary coil connected to the same number of turns as the primary coil therebetween, a first LED connected between the node Nd6 and the node Nd12, the node Nd7 and the node; A second LED (LED2) connected between the node Nd12, a third LED (LED3) connected between the node Nd5 and the node Nd12, and a fourth LED (LED4) connected between the node Nd8 and the node Nd12 And a fifth mutual inductance coil M5 in which a primary coil is connected between the node Nd9 and a node Nd10 and a secondary coil is connected between the node Nd1 and a node Nd11 with the same number of turns as the primary coil. A fifth LED (LED5) connected between Nd10 and the node Nd12, and a sixth LED (LED6) connected between the node Nd11 and the node Nd12.

As described above, in the tenth embodiment of the present invention, the second mutual inductance coil M2 and the third mutual inductance coil at both output ends of the primary coil and the secondary coil of the first mutual inductance coil M1. M3 is connected, and the fourth mutual inductance coil M4 is connected to the output terminal of the primary coil of the second mutual inductance coil M2, and the secondary coil of the third mutual inductance coil M3 is connected. The fifth mutual inductance coil M5 is connected to an output terminal, and LED lights and lamps LED1 to LED6 are configured at the output terminals of the primary and secondary coils of the first to fifth mutual inductance coils M1. At this time, the current supplied from the current driving source 10 is input to the primary coil of the fourth mutual inductance coil M4, and the current driving source 10 to the secondary coil of the fifth mutual inductance coil M5. The current supplied from is input.

Here, the first to fifth mutual inductance coils M1 to M5 have the same number of turns of the primary coil and the secondary coil as before. Accordingly, since the currents output from the primary coils and the secondary coils of the first to fifth mutual inductance coils M1 to M5 are the same by the above Equation 5, the first to sixth LEDs LED1 to LED6. The same also applies to the currents i _{1 to} i ₆ flowing in the furnace.

Eleventh embodiment

FIG. 15 is a current balance circuit diagram for efficiently driving an LED light and a lamp according to an eleventh preferred embodiment of the present invention.

As shown in Fig. 15, the current balance circuit of the eleventh embodiment includes a current drive source 10 for supplying current to a node Nd1 having one side connected to the node Nd12 having a ground potential (0 V) and the other side connected thereto; The first LED (LED1) connected between the node Nd1 and the node Nd2, the second LED (LED2) connected between the node Nd1 and the node Nd3, and the primary coil is connected between the node Nd2 and the node Nd12 And a first mutual inductance coil M1 connected between the node Nd3 and the node Nd4 with the same number of turns as the primary coil, and a third LED (LED3) connected between the node Nd1 and the node Nd5. And a second mutual inductance coil M2 having a primary coil connected between the node Nd4 and a node Nd6 and a secondary coil connected between the node Nd5 and the node Nd6 with the same number of turns as the primary coil. Fourth LED (LED4) connected between the node Nd1 and the node Nd9 And a fifth LED (LED5) connected between the node Nd1 and the node Nd7, a sixth LED (LED6) connected between the node Nd1 and the node Nd8, and a primary coil between the node Nd7 and the node Nd10. Is connected and the third mutual inductance coil M3 is connected between the node Nd8 and the node Nd12 with the same number of turns as the primary coil, and the primary coil is connected between the node Nd9 and the node Nd11. And a fourth mutual inductance coil M4 having a secondary coil connected between the node Nd10 and the node Nd11 with the same number of turns as the primary coil, and a primary coil connected between the node Nd6 and the node Nd12 and the node. A fifth mutual inductance coil M5 is connected between Nd11 and the node Nd12 at the same number of turns as the primary coil.

As described above, in the eleventh embodiment of the present invention, the input end of the primary coil of the second mutual inductance coil M2 is connected to the output end of the secondary coil of the first mutual inductance coil M1, The input terminal of the secondary coil of the fourth mutual inductance coil M2 is connected to the output terminal of the primary coil of the third mutual inductance coil M3, and the primary and secondary coils of the second mutual inductance coil M2 are connected. Input terminals of the primary and secondary coils of the second mutual inductance coil M2 are connected to an output terminal and an output terminal of the primary and secondary coils of the fourth mutual inductance coil M4, and the first to fourth mutual LED lights and lamps LED1 to LED6 are formed at the output terminals of the primary and secondary coils of the inductance coils M1 to M4. At this time, the output terminal of the primary coil of the first mutual inductance coil M1 is connected to ground potential, and the output terminal of the secondary coil of the third mutual inductance coil M3 is connected to ground potential.

The first to fifth mutual inductance coils M1 to M5 have the same number of turns of the primary coil and the secondary coil. Accordingly, since the currents output from the primary coils and the secondary coils of the first to fifth mutual inductance coils M1 to M5 are the same by the above Equation 5, the first to sixth LEDs LED1 to LED6. The same also applies to the currents i _{1 to} i ₆ flowing in the furnace.

12th embodiment

16 is a current balance circuit diagram for efficiently driving LED lights and lamps according to a twelfth preferred embodiment of the present invention.

As shown in Fig. 16, the current balance circuit of the twelfth embodiment includes a current driving source 10 for supplying current to a node Nd1 having one side connected to the node Nd8 having the ground potential (0V) and the other side connected thereto; A first mutual inductance coil M1 in which a primary coil is connected between a node Nd1 and a node Nd2, and a secondary coil is connected between the node Nd1 and a node Nd3 with the same number of turns as the primary coil, and the node Nd2 and the node; The first LED (LED1) connected between the node Nd8 and the primary coil is connected between the node Nd3 and the node Nd4 and the secondary coil is connected between the node Nd1 and the node Nd5 with the same number of turns as the primary coil. A second mutual inductance coil M2, a second LED (LED2) connected between the node Nd4 and the node Nd8, and a primary coil connected between the node Nd5 and the node Nd6, and between the node Nd1 and the node Nd7; Secondary nose with the same number of turns as the primary coil The connected third mutual inductance coil M3, the third LED (LED3) connected between the node Nd6 and the node Nd8, and the fourth LED (LED4) connected between the node Nd7 and the node Nd8. It is composed.

As described above, in the twelfth embodiment of the present invention, the input end of the primary coil of the second mutual inductance coil M2 is connected to the output end of the secondary coil of the first mutual inductance coil M1, The input terminal of the primary coil of the third mutual inductance coil M3 is connected to the output terminal of the secondary coil of the second mutual inductance coil M2, and the primary of the first to third mutual inductance coils M1 to M3. And LED lights and lamps LED1 to LED4 at the output terminal of the secondary coil.

Here, the first to third mutual inductance coils M1 to M3 have the same number of turns of the primary coil and the secondary coil as before. Accordingly, since the currents output from the primary coils and the secondary coils of the first to third mutual inductance coils M1 to M3 are the same as in Equation 5, the first to fourth LEDs LED1 to LED4. The same also applies to the currents i _{1 to} i ₆ flowing in the furnace.

Thirteenth embodiment

17 is a current balance circuit diagram for efficiently driving LED lights and lamps according to a thirteenth preferred embodiment of the present invention.

As shown in Fig. 17, the current balance circuit of the thirteenth embodiment includes a current driving source 10 for supplying current to a node Nd1 having one side connected to the node Nd8 having a ground potential (0V) and the other side connected thereto; A first LED (LED1) connected between node Nd1 and node Nd2, a second LED (LED2) connected between node Nd1 and node Nd3, and a primary coil connected between node Nd2 and node Nd8 And a first mutual inductance coil M1 connected between the node Nd3 and the node Nd4 with the same number of turns as the primary coil, and a third LED (LED3) connected between the node Nd1 and the node Nd5. And a second mutual inductance coil M2 having a primary coil connected between the node Nd4 and the node Nd8 and a secondary coil connected between the node Nd5 and the node Nd6 with the same number of turns as the primary coil; A fourth LED connected between the node Nd1 and the node Nd7 (L ED4) and a third mutual inductance coil M3 having a primary coil connected between the node Nd6 and the node Nd8 and a secondary coil connected between the node Nd7 and the node Nd8 with the same number of turns as the primary coil. It consists of.

As described above, in the thirteenth embodiment of the present invention, the input terminal of the primary coil of the second mutual inductance coil M2 is connected to the output terminal of the secondary coil of the first mutual inductance coil M1, The input terminal of the primary coil of the third mutual inductance coil M3 is connected to the output terminal of the secondary coil of the second mutual inductance coil M2, and the primary of the first to third mutual inductance coils M1 to M3. And LED lights and lamps LED1 to LED4 at the input terminal of the secondary coil.

Here, the first to third mutual inductance coils M1 to M3 have the same number of turns of the primary coil and the secondary coil as before. Accordingly, since the currents output from the primary coils and the secondary coils of the first to third mutual inductance coils M1 to M3 are the same by Equation 5, the first to fourth LEDs LED1 to LED4. The same also applies to the currents i _{1 to} i ₆ flowing in the furnace.

Fourteenth embodiment

FIG. 18 is a current balance circuit diagram for efficiently driving LED lights and a lamp according to a fourteenth preferred embodiment of the present invention.

As shown in Fig. 18, the current balance circuit of the fourteenth embodiment includes a current drive source 10 for supplying current to a node Nd1 having one side connected to the node Nd8 having a ground potential (0V) and the other side connected thereto; A first mutual inductance coil M1 having a primary coil connected between a node Nd1 and a node Nd2 and a secondary coil connected between the node Nd1 and a node Nd3 with the same number of turns as the primary coil, and the node Nd2 and a node; Between the node Nd4 and the node Nd8, and between the node Nd4 and the node Nd4, a primary mutual coil is connected between Nd4 and a secondary coil is connected between the node Nd2 and the node Nd5 with the same number of turns as the primary coil. A plurality of LEDs (LED1n) connected in series, a plurality of LEDs (LED2n) connected in series between the node Nd5 and the node Nd8, and a primary coil connected between the node Nd3 and the node Nd6, and the node Nd3 and the node The primary coil between Nd7 A third mutual inductance coil M3 having a secondary coil connected at the same number of turns, a plurality of LEDs LED3n connected in series between the node Nd6 and the node Nd8, and a series connection between the node Nd7 and the node Nd8; It consists of a plurality of LEDs (LED4n).

As described above, in the fourteenth embodiment of the present invention, the input terminals of the primary and secondary coils of the second mutual inductance coil M2 are connected together to the output terminal of the primary coil of the first mutual inductance coil M1. Input terminals of the primary and secondary coils of the third mutual inductance coil M3 are connected together to an output terminal of the secondary coil of the first mutual inductance coil M1, and the second and third mutual inductance coils are connected together. A plurality of LED lights and lamps are configured in series at the output terminals of the primary and secondary coils of M2 and M3.

Here, the first to third mutual inductance coils M1 to M3 have the same number of turns of the primary coil and the secondary coil as before. Accordingly, since the currents output from the primary coils and the secondary coils of the first to third mutual inductance coils M1 to M3 are the same by Equation 5, the plurality of LED rough surface names and the lamps connected in series are The same applies to the currents i _{1 to} i ₄ flowing in the furnace.

The current balance circuit of the fourteenth embodiment is a representative circuit diagram of the current balance circuit using mutual inductance, and is applicable to the current balance of LEDs configured in parallel in the LED configuration of the parallel-parallel mixed structure.

Experiment of Current Balance Circuit

19 is an experimental diagram of a current balance circuit according to the present invention, and FIG. 20 is an experimental diagram of a LED driving circuit according to the prior art.

First, in the experiment of the current balance circuit according to the present invention, as shown in FIG. 19, the constant current control circuit 20 is connected between the node Nd1 and the node Nd13 which supply current to the current balance circuit, and the current In the balance circuit, the switching circuit 30 is connected between the node Nd12 that discharges current to the ground potential and the node Nd13, and a current detection resistor 40 is formed between the node Nd13 and the ground potential.

The experimental method of the current balance circuit is as follows.

The first experimental method is applied to the current balance circuit of the present invention based on the input power 50W to measure the current applied to the parallel LED module.

The second test method measures the current applied to the LED modules configured in parallel in the state in which the current balance circuit of the present invention is not applied based on the input power 50W.

The experimental measurement waveforms and the experimental measurement current values of the current balance circuit and the LED driving circuit according to the present invention are as follows.

Experimental measurement waveform diagram

21 is a waveform diagram measured during the experiment of the current balance circuit according to the present invention, Figure 22 is a waveform diagram measured during the experiment of the LED driving circuit according to the prior art.

In the current balance circuit of the present invention, the current waveforms flowing through each LED are all measured as shown in the waveform diagram of FIG. 21, but in the conventional LED driving circuit, the current waveforms flowing through each LED are measured differently as shown in the waveform diagram of FIG. This is because current deviation occurs in each LED device configured in parallel due to the deviation caused by Vf (LED forward voltage) error between LEDs, so that the current waveform flowing through each LED is measured differently.

Experimental measured current value

23 is an experimental result diagram showing current values measured in each LED before and after the application of the current balance circuit according to the present invention.

Before applying the current balance circuit of the present invention, as shown in the measurement result of FIG. 23, the maximum deviation of the current value measured in each LED device was measured up to 453 mA, but after applying the current balance circuit of the present invention, it was measured in each LED device. The maximum deviation of one current value was measured at 17mA, which greatly reduced the current deviation.

As described above, the current balance circuit for efficient driving of the LED lighting and the lamp according to the present invention winds the same number of turns in opposite directions to coils sharing the same magnetic field, and the current flows to either side by the interaction of the same current. The technical problem of the present invention can be solved by controlling the current applied to each LED during the series and parallel driving of the LEDs by using the principle of mutual inductance.

Preferred embodiments of the present invention described above are disclosed to solve the technical problem, and those skilled in the art to which the present invention pertains (man skilled in the art) various modifications, changes, additions, etc. within the spirit and scope of the present invention. It will be possible to, and such modifications, changes, etc. will be considered to be within the scope of the following claims.

The current balance circuit of the present invention has been described using LED lights and lamps as an example, but is not limited thereto and may be applied to all devices and circuits for efficient current driving.

Claims (12)

1. In the current balance circuit,

   A current drive source for supplying current;

   A plurality of LEDs configured in parallel; And

   And at least one mutual inductance coil receiving current from the current driving source and supplying the same current to the plurality of LEDs by mutual inductance of the primary and secondary coils having the same number of turns.
2. In the current balance circuit,

   A current drive source for supplying current;

   A plurality of LEDs configured in parallel; And

   And at least one mutual inductance coil receiving current through the LED to make the current flowing through the LED the same by mutual inductance of the primary and secondary coils having the same number of turns.
3. The coil of claim 1 or 2, wherein the mutual inductance coil is:

   A first mutual inductance coil M1 receiving the current;

   A second mutual inductance coil M2 connected to an output end of the primary coil of the first mutual inductance coil M1; And

   And a third mutual inductance coil (M3) connected to the output terminal of the secondary coil of the first mutual inductance coil (M1).
4. The coil of claim 3 wherein the mutual inductance coil is:

   And a fourth mutual inductance coil (M4) connected to an output terminal of the primary coil of the second mutual inductance coil (M2).
5. The coil of claim 3 wherein the mutual inductance coil is:

   And a fifth mutual inductance coil (M5) connected to the output terminal of the secondary coil of the third mutual inductance coil (M3).
6. The coil of claim 3 wherein the mutual inductance coil is:

   A fourth mutual inductance coil (M4) connected to an output end of the primary coil of the second mutual inductance coil (M2); And

   And a fifth mutual inductance coil (M5) connected to the output terminal of the secondary coil of the third mutual inductance coil (M3).
7. The coil of claim 1 or 2, wherein the mutual inductance coil is:

   A first mutual inductance coil M1 receiving the current;

   A second mutual inductance coil M2 receiving the current; And

   The primary coil is connected to the common output terminal of the primary and secondary coils of the first mutual inductance coil M1, and the secondary coil is connected to the common output terminal of the primary and secondary coils of the second mutual inductance coil M2. And a third mutual inductance coil (M3) connected thereto.
8. 8. The coil of claim 7, wherein the mutual inductance coil is:

   And a fourth mutual inductance coil (M4) connected to an input terminal of the primary coil of the first mutual inductance coil (M1).
9. 8. The coil of claim 7, wherein the mutual inductance coil is:

   And a fifth mutual inductance coil (M5) connected to the output terminal of the secondary coil of the second mutual inductance coil (M2).
10. The coil of claim 3 wherein the mutual inductance coil is:

    A fourth mutual inductance coil M4 connected to an input terminal of the primary coil of the first mutual inductance coil M1; And

    And a fifth mutual inductance coil (M5) connected to the output terminal of the secondary coil of the second mutual inductance coil (M2).
11. The coil of claim 1 or 2, wherein the mutual inductance coil is:

    A first mutual inductance coil M1 receiving the current;

    A second mutual inductance coil (M2) connected to an output terminal of the secondary coil of the first mutual inductance coil (M1); And

    And a third mutual inductance coil (M3) connected to an output terminal of the secondary coil of the second mutual inductance coil (M2).
12. The coil of claim 1 or 2, wherein the mutual inductance coil is:

    A first mutual inductance coil M1 receiving the current;

    A second mutual inductance coil M2 connected to an output end of the primary coil of the first mutual inductance coil M1; And

    And a third mutual inductance coil (M3) connected to an output terminal of the primary coil of the second mutual inductance coil (M2).

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