KR102132666B1 - Device for driving light emitting diode - Google Patents

Abstract

A high-efficiency constant current and constant power light emitting diode driving device by improving power conversion loss is disclosed.
The disclosed light emitting diode driving apparatus includes a power supply unit for providing an AC voltage, a full-wave rectification unit for full-wave rectification of the AC voltage from the power supply unit, a first stabilization circuit for stabilizing the full-wave rectification voltage from the full-wave rectification unit to a first DC voltage, and full-wave rectification It includes a current control unit for adjusting the current supplied to the light emitting diodes using the voltage and the first direct current voltage and a rectification voltage supply unit for supplying the full-wave rectification voltage to the current control unit.

Description

Light emitting diode driving device {DEVICE FOR DRIVING LIGHT EMITTING DIODE}

The present invention relates to a light emitting diode driving device, and relates to a high efficiency constant current and constant power light emitting diode driving device by improving power conversion loss.

In general, a light emitting diode (LED) is a light emitting device capable of realizing high luminance with low power, and is widely used in lighting. The light emitting diode is driven by being supplied with a DC voltage. When the external power is an AC voltage, the AC voltage is changed to a DC voltage to generate a driving voltage for driving the light emitting diode. (Prior literature Korean Patent Publication No. 10-2009-0120225, Publication date 2009.11.24)

1 is a circuit diagram showing a general LED driving device.

Referring to FIG. 1, a general LED driving device includes a power supply unit Vac for supplying an AC voltage, and first to fourth diodes D1 to D4, and performs full-wave rectification of the AC voltage from the power supply unit Vac. A full-wave rectifying control unit 10, a first stabilization circuit (C1) for stabilizing the rectified voltage from the full-wave rectification control unit (10), and a current control unit for rectifying the first DC voltage from the first stabilization circuit (C1) ( 20), a second stabilization circuit (C2) for stabilizing the second DC voltage from the current control unit (20) and a light emitting diode module (30) connected to the output terminal of the second stabilization circuit (C2).

A typical LED driving device converts a high AC voltage from a power source (Vac) into a constant current, resulting in power conversion loss. In particular, the power conversion loss has a problem in that power consumption increases in the peak voltage section of the AC voltage. In order to improve this, the constant current driving circuit of FIG. 1 has been proposed, but due to the characteristics of the rectifying voltage (pulsating voltage), constant current control is performed, but it is difficult to control the constant power by the peak voltage of the AC voltage.

The problem to be solved by the present invention is to provide a light emitting diode driving device capable of realizing constant current and constant power driving of a high voltage light emitting diode using a simple driving circuit.

The present invention provides the following solutions to adjust the driving current according to the peak voltage section of the AC voltage input from the outside and other sections.

In a first embodiment of the present invention, a power supply unit for providing an AC voltage, a full-wave rectification unit for full-wave rectification of the AC voltage from the power supply unit, and a first stabilization circuit for stabilizing the full-wave rectification voltage from the full-wave rectification unit to a first DC voltage And a current control unit for adjusting the current supplied to the light emitting diodes using the full-wave rectification voltage and the first DC voltage, and a rectification voltage supply unit for supplying the full-wave rectification voltage to the current control unit. The depletion-type MOSFET is composed of a switching element, and includes a configuration of adjusting the driving current of the light emitting diode by using the full-wave rectifying voltage and the first DC voltage without a separate gate driving signal.

In addition, the present invention is configured to control the driving current of the light emitting diode by extracting the peak voltage section and other sections of the AC voltage for any one of the polarity of the negative polarity and the positive polarity full-wave rectification where the input AC voltage is full-rectified It includes.

In the second embodiment of the present invention, a power supply unit for providing an AC voltage, a full-wave rectification unit for full-wave rectification of the AC voltage from the power supply unit, and a first stabilization circuit for stabilizing the full-wave rectification voltage from the full-wave rectification unit to a first DC voltage And, the current control unit for adjusting the driving current according to the level of the AC voltage by using the full-wave rectification voltage and the first DC voltage, and a second supply of a positive polarity full-wave rectification voltage of the full-wave rectification voltage to the current control unit 1 rectifying voltage supply unit; And a second rectifying voltage supply unit for supplying the North Pole full-wave rectifying voltage to the current control unit, wherein the current control unit comprises a depletion-type MOSFET as a switching element, and performs a full-wave rectification voltage without a separate gate driving signal. 1 Includes a configuration that controls the driving current of the light emitting diode using DC voltage.

In addition, the present invention includes a configuration of adjusting the driving current of the light emitting diode by extracting the peak voltage section and other sections of the AC voltage for both the negative and positive full-wave rectified voltages in which the input AC voltage is fully rectified.

In a third embodiment of the present invention, a power supply unit for providing an AC voltage, a full-wave rectification unit for full-wave rectification of the AC voltage from the power supply unit, and a first stabilization circuit for stabilizing the full-wave rectification voltage from the full-wave rectification unit to a first DC voltage And a current control unit for adjusting a driving current according to the level of the AC voltage using the full-wave rectification voltage and the first DC voltage, and a rectification voltage supply unit for supplying the full-wave rectification voltage to the current control unit. The control unit includes an enhanced metal-oxide semiconductor field-effect transistor (MOSFET) configuration.

According to one preferred embodiment of the present invention, it is possible to implement constant current and constant power driving of a high voltage light emitting diode with a simple configuration.

The present invention can improve power consumption by adjusting the output current according to the voltage level difference between the peak voltage section of the AC voltage and other sections. Specifically, the current controller of the present invention provides a first output current that decreases in inverse proportion as the full-wave rectification voltage increases, and provides a second output current that converges the output current to the constant current as the full-wave rectification voltage decreases.

That is, the LED driving apparatus according to the present invention provides a high-efficiency constant current and constant power LED driving circuit by controlling the current size inversely in the case of rated voltage, constant current driving, and high voltage, and at the same time simplified. Circuit structure can be implemented.

In addition, the LED driving apparatus of the present invention can maximize the constant power driving gain by extracting the peak voltage section of the AC voltage using the positive and negative polarity rectifying voltage of the full-wave rectifying unit having a bridge diode structure.

1 is a circuit diagram showing a general LED driving device.
2A is a circuit diagram showing a light emitting diode driving apparatus according to a first embodiment of the present invention.
2B is a circuit diagram showing a light emitting diode driving apparatus according to a second embodiment of the present invention.
2C is a circuit diagram showing a light emitting diode driving apparatus according to a third embodiment of the present invention.
3 to 5 are waveform diagrams showing the input AC voltage and the output DC voltage of the light emitting diode.
6 is a circuit diagram showing various embodiments of the current control unit of the present invention.
7A is a circuit diagram showing an LED driving apparatus according to a fourth embodiment of the present invention.
7B is a circuit diagram showing a light emitting diode driving apparatus according to a fifth embodiment of the present invention.
7C is a circuit diagram showing a light emitting diode driving apparatus according to a sixth embodiment of the present invention.
8A is a circuit diagram showing a light emitting diode driving apparatus according to a seventh embodiment of the present invention.
8B is a circuit diagram showing an LED driving apparatus according to an eighth embodiment of the present invention.
8C is a circuit diagram showing a light emitting diode driving apparatus according to a ninth embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments introduced below are provided as examples in order to sufficiently convey the spirit of the present invention to those skilled in the art. Accordingly, the present invention is not limited to the embodiments described below and may be embodied in other forms. In addition, in the drawings, the shape of the component and the like may be exaggerated. Throughout the specification, the same reference numbers refer to the same components. Changes in components to a degree not departing from the scope of the technical idea of the present invention do not include a limiting meaning and may be limited only by the contents of the claims as a description for expressing the technical idea of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings in order to enable those skilled in the art to easily implement the present invention.

2A is a circuit diagram showing a light emitting diode driving apparatus according to a first embodiment of the present invention, and FIGS. 3 to 5 are waveform diagrams showing input AC voltage and output DC voltage of the light emitting diode.

2A to 5, the LED driving apparatus according to the first embodiment of the present invention includes a power supply unit Vac, a full-wave rectification unit 110, a first stabilization circuit C1, and a rectification voltage supply unit 150 , A current control unit 120, a second stabilization circuit C2 and a light emitting diode module 130.

The power supply unit Vac generates a high voltage AC voltage.

First and second resistors R1 and R2 having a protective function may be connected to both ends of the power supply unit Vac. The first and second resistors R1 and R2 have a function of protecting the wiring and circuit of the light emitting diode driving device by blocking it when an excessive input voltage is supplied above a certain voltage level through the power supply unit Vac.

Here, the first and second resistors R1 and R2 have a protective function and can be replaced with a fuse.

The full-wave rectifying unit 110 may be composed of first to fourth diodes D1 to D4, and full-wave rectifies an AC voltage from the power source Vac to generate a full-wave rectifying voltage Vrec. The output terminal of the full-wave rectifier 110 is connected to the first stabilization circuit (C1).

The output terminal of the full-wave rectifying unit 110 is defined as first and second nodes N1 and N2 for convenience of description. The first node N1 may be defined as an output terminal outputting a positive polarity full-wave rectification voltage, and the second node N2 may be defined as an output terminal outputting a negative-polarity full-wave rectification voltage.

The first stabilization circuit C1 may be a capacitor connected in parallel with the first and second nodes N1 and N2 of the full-wave rectifying unit 110. The first stabilization circuit C1 stabilizes the full-wave rectifying voltage Vrec to the first DC voltage Vdc1.

The rectifying voltage supply unit 150 has a function of supplying the full-wave rectifying voltage Vrec to the current control unit 120. The rectifying voltage supply unit 150 includes a fifth diode D5 connected between the first node N1 of the full-wave rectifying unit 110 and the first stabilization circuit C1, the first node N1 and the And a fourth resistor R4 connected between the source terminals of the current controller 120. More specifically, the rectifying voltage supply unit 150 supplies the full-wave rectifying voltage Vrec from the full-wave rectifying unit 110 to the current control unit 120.

The current controller 120 controls the driving current of the light emitting diode module 130 according to the voltage level of the full-wave rectifying voltage Vrec from the rectifying voltage supply unit 150. The current control unit 120 includes a switching element Q1 and a third resistor R3.

The switching element Q1 illustrates an n-type depletion metal-oxide semiconductor field-effect transistor (MOSFET) device as an example, but the present invention is not limited thereto. The n-type depletion type MOSFET may be changed to a JFET (Junctin gate Field-Effect Transistor), a MOSFET (Metal-Oxide semiconductor Field-Effect Transistor), and a BJT (Bipolar Junction Transistor). In the present invention, the switching element Q1 does not require a separate gate driving voltage for driving the gate of the switching element Q1, and it is preferable to use an N-type depletion type MOSFET that can easily implement a circuit configuration. .

The source terminal of the switching element (Q1) is connected to the first node (N1) of the full-wave rectifier 110, the gate terminal is connected to the output terminal of the first stabilization circuit (C1), the drain terminal is the light emitting diode module It is connected to the cathode end of 130. The switching element Q1 may be driven by a voltage difference between the gate and source terminals.

The gate terminal is connected in series with the first stabilization circuit C1, and the source terminal is connected in series with the full-wave rectification unit 110. Accordingly, the driving current of the switching element Q1 may be varied by a voltage difference between the first DC voltage Vdc1 supplied to the gate terminal and the full-wave rectifying voltage Vrec supplied to the source terminal. Specifically, the present invention can improve the power consumption by adjusting the output current according to the voltage level difference between the peak voltage section of the AC voltage and other sections. That is, the current control unit 120 of the present invention provides the second output current If2 of FIG. 5 that decreases in inverse proportion as the full-wave rectification voltage Vrec increases, and the output current decreases as the full-wave rectification voltage Vrec decreases. The first output current If1 in FIG. 4 converging to the constant current is provided.

The LED driving apparatus of the present invention uses a full-wave rectifying voltage (Vrec) and a first DC voltage (Vdc1) to light-emitting diodes using the gate/source voltage difference of the switching element (Q1) composed of an N-type depletion type MOSFET. By controlling the driving current of the module 130, the circuit structure is simple. In addition, the LED driving apparatus of the present invention provides a high-efficiency constant current and constant power LED driving circuit by controlling the magnitude of the current inversely in the case of rated voltage, constant current driving, and high voltage, and at the same time simplified circuit You can implement the structure.

2B is a circuit diagram including a stabilization circuit in the LED driving apparatus according to the first embodiment of the present invention.

As shown in FIG. 2B, in the LED driving apparatus according to the second embodiment of the present invention, all configurations except the third and fourth stabilization circuits C3 and Z are according to the first embodiment shown in FIG. 2A. Since it is the same as the light emitting diode driving apparatus, all components except the third and fourth stabilization circuits C3 and Z are denoted by the same reference numerals and detailed description will be omitted.

The third stabilization circuit C3 may be a capacitor connected in parallel to the source terminal and the gate terminal of the switching element Q1 included in the current control unit 120.

The third stabilization circuit C3 has a function of preventing damage to the switching element Q1 by the high voltage full-wave rectification voltage Vrec supplied to the source terminal.

The fourth stabilization circuit Z may be a Zener diode for blocking a predetermined voltage or more in the full-wave rectifying voltage Vrec supplied through the rectifying voltage supply unit 150.

The light-emitting diode driving apparatus according to the second embodiment of the present invention uses the full-wave rectifying voltage (Vrec) and the first direct-current voltage (Vdc1) as the gate/source voltage of the switching element (Q1) composed of an N-type depletion type MOSFET. In controlling the driving current of the light emitting diode module 130 using the difference, third and fourth stabilization circuits C3 and Z are provided to prevent circuit damage due to high voltage full-wave rectification voltage Vrec. When the input voltage is applied over Vz, the resistance value of the voltage compensation resistor can be lower than that without Z, and when the input voltage is higher than Vz, it is calculated as "(Vrect-Vz1-Vr3) / R4 = voltage compensation current" Since the compensation current can be increased, the stability of constant current or constant power can be improved.

2C is a circuit diagram showing a light emitting diode driving apparatus according to a third embodiment of the present invention.

As shown in Figure 2c, the light emitting diode driving apparatus according to the third embodiment of the present invention is a light emitting diode according to the first embodiment shown in Figure 2a all configurations except the temperature resistance (PTCR: Positive Temperature Coefficient Resistor) Since it is the same as the driving device, all components except the temperature resistance (PTCR) are denoted by the same reference numerals and detailed description will be omitted.

The temperature resistance PTCR and the third resistance R may be connected in parallel between the source terminal of the switching element Q1 and the output terminal of the first stabilization circuit C1.

The resistance of the temperature resistance PTCR may vary depending on the internal temperature of the LED driving device.

Here, the resistance of the temperature resistance PTCR may be changed according to the temperature of the light emitting diode, and the resistance may be changed according to the temperature of the driving devices.

Specifically, when the internal temperature of the light emitting diode driving device increases, the temperature resistance PTCR increases, so that the current control unit 120 controls the driving current low to protect the light emitting diode.

Therefore, the light emitting diode driving apparatus according to the third embodiment of the present invention may further improve the damage caused by heat of the light emitting diode by further controlling the driving current of the light emitting diode according to the temperature change by further including a temperature resistance PTCR.

In the above, the light emitting diode driving device according to the third embodiment of the present invention shown in FIG. 2C and the light emitting diode driving device according to the second embodiment of the present invention shown in FIG. 2B are limited to different embodiments and will be described in detail. However, the present invention is not limited thereto, and the third and fourth stabilization circuits C3 and Z of the second and third embodiments and the driving of the light emitting diode of another embodiment including both the configurations of the temperature resistance PTCR. It may include a device.

6 is a circuit diagram showing various embodiments of the current control unit of the present invention.

As shown in FIG. 6, the current control unit of the present invention discloses various embodiments including switching elements such as an enhanced metal-oxide semiconductor field-effect transistor (MOSFET).

The current control unit of FIG. 6A is a current control unit without a gate terminal and a grounded resistor, and voltage compensation from the rectifying voltage supply unit may be supplied to the source terminal of the switching element.

The current control unit of FIG. 6B is a current control unit having a gate terminal and a grounded resistor, and voltage compensation from the rectifying voltage supply unit may be supplied to the source terminal of the switching element.

The current control unit of FIG. 6C is a current control unit including two n-type bipolar transistors (NPN Bipolar Transistor, Q1, Q2), and the voltage compensation from the rectifying voltage supply unit is supplied to the emitter terminal of the first bipolar transistor Q1. Can.

The current control unit of FIG. 6D is a current control unit including an n-type bipolar transistor Q1 and a shunt regulator IC (U1 431), and the voltage compensation from the rectified voltage supply unit is an emitter of the first bipolar transistor Q1. It can be supplied to the terminal.

The current control unit of FIG. 6E is a current control unit including a MOSFET Q1 and a shunt regulator IC (U1 431), and the voltage compensation from the rectified voltage supply unit may be supplied to the source terminal of the MOSFET Q1.

The current control unit of FIG. 6F is a current control unit using a MOSFET Q1 and a shunt regulator IC (U1 317), and the voltage compensation from the rectified voltage supply unit may be supplied to the source terminal of the MOSFET Q1.

The current control unit of FIG. 6G is a current control unit using a MOSFET (Q1) and a shunt regulator (Shent Regulator IC, U1 317), and further comprising a ripple filter composed of Rf and Cf. The voltage compensation from the rectifying voltage supply unit is the MOSFET ( It can be supplied to the source terminal of Q1).

The current control unit described above can be applied to various embodiments including a p-type depletion type or an incremental MOSFET switching element as well as the above embodiments.

7A is a circuit diagram showing an LED driving apparatus according to a fourth embodiment of the present invention.

As shown in FIG. 7A, the LED driving apparatus according to the fourth embodiment of the present invention excludes the LED driving device according to the first embodiment of the present invention and the rectifying voltage supply unit 250 and the current control unit 220. Since all components are the same, the components except for the rectified voltage supply unit 250 and the current control unit 220 are denoted by the same reference numerals and detailed description will be omitted.

The rectifying voltage supply unit 250 has a function of supplying the full-wave rectifying voltage (Vrec) to the current control unit 220. The rectifying voltage supply unit 250 includes a fifth diode D5 connected between the second node N2 of the full-wave rectifying unit 110 and the first stabilization circuit C1, the second node N2 and the It includes a fourth resistor (R4) connected between the current control unit 220.

The current control unit 220 controls the driving current of the LED module 130 according to the voltage level of the full-wave rectifying voltage Vrec from the rectifying voltage supply unit 250.

The current control unit 220 includes a switching element Q1 and a third resistor R3.

The switching element Q1 illustrates an n-type depletion metal-oxide semiconductor field-effect transistor (MOSFET) device as an example, but the present invention is not limited thereto. The n-type depletion type MOSFET may be changed to a JFET (Junctin gate Field-Effect Transistor), a MOSFET (Metal-Oxide semiconductor Field-Effect Transistor), and a BJT (Bipolar Junction Transistor). In the present invention, the switching element Q1 does not require a separate gate driving voltage for driving the gate of the switching element Q1, and it is preferable to use an N-type depletion type MOSFET that can easily implement a circuit configuration. .

The source terminal of the switching element Q1 is connected to the second node N2, the drain terminal is connected to the output terminal of the first stabilization circuit C1, and the gate terminal is connected to the anode of the light emitting diode module 130. do.

The switching element Q1 may supply the full-wave rectifying voltage Vrec to the source terminal, so that the driving current of the light emitting diode module 130 can be varied.

The light emitting diode driving apparatus according to the fourth embodiment of the present invention provides a high efficiency constant current and constant power light emitting diode driving circuit by driving a constant current in case of a rated voltage and inversely adjusting a current size in the case of a high voltage. At the same time, a simplified circuit structure can be implemented.

7B is a circuit diagram showing a light emitting diode driving apparatus according to a fifth embodiment of the present invention.

As shown in FIG. 7B, in the light emitting diode driving apparatus according to the fifth embodiment of the present invention, all configurations except the third and fourth stabilization circuits C3 and Z are according to the fourth embodiment illustrated in FIG. 7A. Since it is the same as the light emitting diode driving apparatus, all components except the third and fourth stabilization circuits C3 and Z are denoted by the same reference numerals and detailed description will be omitted.

The third stabilization circuit C3 may be a capacitor connected in parallel to the source terminal and the gate terminal of the switching element Q1 included in the current control unit 220.

The third stabilization circuit C3 has a function of preventing damage to the switching element Q1 by the high voltage full-wave rectification voltage Vrec supplied to the source terminal.

The fourth stabilization circuit Z may be a Zener diode for blocking a predetermined voltage or more in the full-wave rectifying voltage Vrec supplied through the rectifying voltage supply unit 150.

The light-emitting diode driving apparatus according to the fifth embodiment of the present invention uses the full-wave rectifying voltage (Vrec) and the first direct-current voltage (Vdc1) as the gate/source voltage of the switching element (Q1) composed of an N-type depletion type MOSFET. In controlling the driving current of the light emitting diode module 130 using the difference, third and fourth stabilization circuits C3 and Z are provided to prevent circuit damage due to high voltage full-wave rectification voltage Vrec. When the input voltage is applied over Vz, the resistance value of the voltage compensation resistor can be lower than that without Z, and when the input voltage is higher than Vz, it is calculated as "(Vrect-Vz1-Vr3) / R4 = voltage compensation current" Since the compensation current can be increased, the stability of constant current or constant power can be improved.

7C is a circuit diagram showing a light emitting diode driving apparatus according to a sixth embodiment of the present invention.

As shown in Figure 7c, the light emitting diode driving apparatus according to the sixth embodiment of the present invention is the same as the light emitting diode driving apparatus according to the fourth embodiment shown in Figure 7a except the temperature resistance (PTCR) All components except the temperature resistance (PTCR) are denoted by the same reference numerals and detailed description will be omitted.

The temperature resistance PTCR and the third resistance R may be connected in parallel between the source terminal of the switching element Q1 and the output terminal of the first stabilization circuit C1.

The resistance of the temperature resistance PTCR may vary depending on the internal temperature of the LED driving device.

Here, the resistance of the temperature resistance PTCR may be changed according to the temperature of the light emitting diode, and the resistance may be changed according to the temperature of the driving devices.

Specifically, when the internal temperature of the light emitting diode driving device increases, the temperature resistance PTCR increases, so that the current control unit 120 controls the driving current low to protect the light emitting diode.

Therefore, the light emitting diode driving apparatus according to the sixth embodiment of the present invention further includes a temperature resistance (PTCR) to adjust the driving current of the light emitting diode according to the temperature change, thereby improving damage due to heat of the light emitting diode.

In the above, the light emitting diode driving device according to the sixth embodiment of the present invention shown in FIG. 7C and the light emitting diode driving device according to the fifth embodiment of the present invention shown in FIG. 7B are limited to different embodiments and will be described in detail. However, the present invention is not limited thereto, and the third and fourth stabilization circuits C3 and Z of the second and third embodiments and the driving of the light emitting diode of another embodiment including both the configurations of the temperature resistance PTCR. It may include a device.

8A is a circuit diagram showing a light emitting diode driving apparatus according to a seventh embodiment of the present invention.

8A, the LED driving apparatus according to the seventh embodiment of the present invention includes the LED driving apparatus and the first and second rectifying voltage supply units 350a according to the first and fourth embodiments of the present invention. 350b), the first and second rectifying voltage supply units 350a and 350b, and the first and second current control units 320a and 320b are the same, except for the first and second current control units 320a and 320b. The components except for the same reference numerals and detailed description will be omitted.

The first rectifying voltage supply unit 350a includes a fifth diode D5 connected between the first node N1 of the full-wave rectifying unit 110 and the first stabilization circuit C1, and the first node N1. And a sixth resistor R6 connected between the first current controller 320a. The first rectifying voltage supply unit 350a has a function of supplying the full-wave rectifying voltage Vrec to the first current control unit 320a. The first node N1 may be defined as an output terminal through which a positive polarity full-wave rectification voltage is output.

The second rectifying voltage supply unit 350b includes a sixth diode D6 connected between the second node N2 of the full-wave rectifying unit 110 and the first stabilization circuit C1, and the second node N2. And a fifth resistor R5 connected between and the second current control unit 320b. The second rectifying voltage supply unit 350b has a function of supplying the full-wave rectifying voltage Vrec to the second current control unit 320b. The second node N2 may be defined as an output terminal through which a negative polarity full-wave rectification voltage is output.

The first and second current control units 320a and 320b drive current of the light emitting diode module 130 according to the voltage level of the full-wave rectifying voltage Vrec from the first and second rectifying voltage supply units 350a and 350b. To control. The first current control unit 320a includes a second switching element Q2 and a fourth resistor R4, and the second current control unit 320b includes a first switching element Q1 and a third resistor R3. It includes.

The first and second switching elements Q1 and Q2 illustrate an n-type depletion metal-oxide semiconductor field-effect transistor (MOSFET) device as an example, but the present invention is not limited thereto. The n-type depletion type MOSFET may be changed to a JFET (Junctin gate Field-Effect Transistor), a MOSFET (Metal-Oxide semiconductor Field-Effect Transistor), and a BJT (Bipolar Junction Transistor). In the present invention, the first and second switching elements Q1 and Q2 do not require separate gate driving voltages for driving the gate, and it is preferable to use an N-type depletion type MOSFET that can easily implement a circuit configuration. Do.

The source terminal of the second switching element Q2 is connected to the first node N1, the gate terminal is connected to the first output terminal of the first stabilization circuit C1, and the drain terminal is a light emitting diode module 130 It is connected with the cathode.

The source terminal of the first switching element Q1 is connected to the second node N2, the gate terminal is connected to the anode of the light emitting diode module 130, and the drain terminal is the first stabilization circuit C1. It is connected to the second output terminal.

The first and second switching elements Q1 and Q2 may adjust the driving current of the light emitting diode module 130 using the full-wave rectifying voltage Vrec supplied to the source terminal.

The light emitting diode driving apparatus of the seventh embodiment of the present invention provides a high efficiency constant current and constant power light emitting diode driving circuit by controlling the current magnitude inversely in the case of a rated voltage and driving a constant current, and at the same time simplifies the same. Circuit structure can be implemented.

8B is a circuit diagram showing an LED driving apparatus according to an eighth embodiment of the present invention.

As shown in FIG. 8B, in the light emitting diode driving apparatus according to the seventh embodiment of the present invention, all configurations except the third to sixth stabilization circuits C3, C4, Z1, and Z2 are the seventh shown in FIG. 8A. In the same manner as the light emitting diode driving apparatus according to the embodiment, all components except the third to sixth stabilization circuits C3, C4, Z1, and Z2 are denoted by the same reference numerals and detailed description thereof will be omitted.

The third and fourth stabilization circuits C3 and C4 are connected in parallel to the source and gate terminals of the first and second switching elements Q1 and Q2 included in the first and second current controllers 320a and 320b. It can be a capacitor.

The third and fourth stabilization circuits C3 and C4 have a function of preventing damage to the first and second switching elements Q1 and Q2 by the high voltage full-wave rectifying voltage Vrec supplied to the source terminal.

The fifth and sixth stabilization circuits Z1 and Z2 are Zener diodes for blocking a predetermined voltage or more in the full-wave rectifying voltage Vrec supplied through the first and second rectifying voltage supply units 350a and 350b. Can.

The LED driving apparatus according to the eighth embodiment of the present invention includes the first and second switching elements Q1, which are composed of an N-type depletion type MOSFET using the full-wave rectifying voltage Vrec and the first DC voltage Vdc1. In controlling the driving current of the light emitting diode module 130 using the gate/source voltage difference of Q2), the third to sixth stabilization circuits that can prevent circuit damage due to the high voltage full-wave rectifying voltage (Vrec) ( If C3, C4, Z1, Z2) is provided and the input voltage is applied to Vz or higher, the resistance value of the voltage compensation resistor can be lower than that without Z1, Z2, and if the input voltage is higher than Vz "(Vrect-Vz1 -Vr3) / R4 = Compensation current calculated by "Voltage compensation current" can increase the stability of constant current or constant power.

8C is a circuit diagram showing a light emitting diode driving apparatus according to a sixth embodiment of the present invention.

As shown in FIG. 8C, the light emitting diode driving apparatus according to the ninth embodiment of the present invention includes all configurations except the first and second temperature resistances PTCR1 and PTCR2 according to the seventh embodiment shown in FIG. 8A. Since it is the same as the light emitting diode driving apparatus, all components except the first and second temperature resistances PTCR1 and PTCR2 are denoted by the same reference numerals and detailed description will be omitted.

The first temperature resistor PTCR1 and the third resistor R3 may be connected in parallel between the source terminal of the first switching element Q1 and the first output terminal of the first stabilization circuit C1.

The second temperature resistor PTCR2 and the fourth resistor R4 may be connected in parallel between the source terminal of the second switching element Q2 and the second output terminal of the first stabilization circuit C1.

The resistance values of the first and second temperature resistors PTCR1 and PTCR2 may vary according to the internal temperature of the LED driving apparatus.

Here, the resistance values of the first and second temperature resistors PTCR1 and PTCR2 may be changed according to the temperature of the light emitting diode, and the resistance values may be changed according to the temperature of the driving devices.

Specifically, the first and second temperature resistances PTCR1 and PTCR2 increase the resistance when the internal temperature of the LED driving device increases, so that the current control unit 120 controls the driving current to be low to protect the LED. It has the function to do.

Therefore, the light emitting diode driving apparatus according to the ninth embodiment of the present invention further includes first and second temperature resistances PTCR1 and PTCR2 to adjust the driving current of the light emitting diode according to the temperature change, thereby causing heat from the light emitting diode. Damage can be improved.

In the above, the LED driving device according to the sixth embodiment of the present invention shown in FIG. 8C and the LED driving device according to the fifth embodiment of the present invention shown in FIG. 8B are limited to different embodiments and will be described in detail. However, the present invention is not limited thereto, and the configuration of the third to sixth stabilization circuits C3, C4, Z1 and Z2 of the second and third embodiments and the configuration of the first and second temperature resistances PTCR1 and PTCR2 A light emitting diode driving device of another embodiment including all of the above may be included.

In the above, although various embodiments and features of the present invention have been described, the present invention is not limited to the above-described embodiments and features, and may be variously modified without departing from the spirit of the present invention. have.

150, 250: rectifying voltage supply unit 120, 220: current control unit

Claims (24)

A power supply unit providing an AC voltage;
A full-wave rectifying unit for full-wave rectifying the AC voltage from the power supply unit;
A first stabilization circuit stabilizing the full-wave rectification voltage from the full-wave rectification unit to a first DC voltage;
A current control unit for adjusting the current supplied to the light emitting diodes by using the full-wave rectification voltage and the first DC voltage; And
It includes a rectified voltage supply for supplying the full-wave rectified voltage to the current control unit,
The current control unit includes a switching element,
The switching element is a light emitting diode driving circuit, the source terminal is connected to the full-wave rectification unit to receive the full-wave rectification voltage, one of the gate terminal and the drain terminal is connected to the first stabilization circuit to receive the first DC voltage. The light emitting diode driving circuit of claim 1, further comprising a second stabilization circuit stabilizing the rectified voltage from the current controller to a second DC voltage. The LED driving circuit of claim 1, wherein the full-wave rectified voltage from the rectified voltage supply is a positive-polar full-wave rectified voltage. The LED driving circuit according to claim 1, wherein the full-wave rectification voltage from the rectification voltage supply is a negative-polarity full-wave rectification voltage. The method according to claim 1, wherein the rectifying voltage supply unit is connected between the output terminal of the full-wave rectifying unit and the current control unit for controlling the magnitude of the full-wave rectifying voltage; And
And a diode for preventing reverse flow connected between the output terminal of the full-wave rectifying unit and the output terminal of the first stabilization circuit. The method according to claim 3, wherein the current control unit includes a switching element, the source terminal of the switching element is connected to the first node of the full-wave rectification unit to which the positive polarity full-wave rectification voltage is supplied, the gate terminal of the switching element is the A light emitting diode driving circuit connected to a first output terminal of a first stabilization circuit, and a drain terminal of the switching element connected to a cathode of the light emitting diode module. The method according to claim 4, wherein the current control unit includes a switching element, the source terminal of the switching element is connected to the second node of the full-wave rectification unit to which the negative polarity full-wave rectification voltage is supplied, and the gate terminal of the switching element is the A light emitting diode driving circuit connected to the anode of the light emitting diode module, and the drain terminal of the switching element connected to the second output terminal of the first stabilization circuit. The method according to claim 6 or 7, wherein the switching element is a depletion type MOSFET (Depletion Metal-Oxide semiconductor Field-Effect Transistor) light-emitting diode driving circuit. The method according to claim 1, wherein the current control unit includes a switching element, the light emitting diode driving circuit further comprises a third stabilization circuit connected in parallel to the gate terminal and the source terminal of the switching element. The method according to claim 1, wherein the rectifying voltage supply unit further comprises a fourth stabilizing circuit for blocking a constant voltage LED driving circuit. The method according to claim 1, The current control unit LED driving circuit further comprises a temperature resistance. The method according to claim 1, wherein the current control unit LED driving circuit comprising an n-type or p-type switching element. A power supply unit providing an AC voltage;
A full-wave rectifying unit for full-wave rectifying the AC voltage from the power supply unit;
A first stabilization circuit stabilizing the full-wave rectification voltage from the full-wave rectification unit to a first DC voltage;
A current control unit including a first current control unit and a second current control unit that adjust a driving current according to the level of the AC voltage using the full-wave rectification voltage and the first DC voltage;
A first rectifying voltage supply unit supplying a positive polarity rectifying voltage among the full-wave rectification voltages to the first current control unit; And
And a second rectifying voltage supply unit supplying a negative polarity full-wave rectifying voltage among the full-wave rectification voltages to the second current control unit,
The first current control unit and the second current control unit each include a switching element,
The switching element is a light emitting diode driving circuit, the source terminal is connected to the full-wave rectification unit to receive the full-wave rectification voltage, one of the gate terminal and the drain terminal is connected to the first stabilization circuit to receive the first DC voltage. The method according to claim 13, Light-emitting diode driving circuit including a second stabilization circuit for stabilizing the rectified voltage rectified from the current control to a second DC voltage. The method according to claim 13, wherein the first rectifying voltage supply unit is connected between the first node and the first current control unit, the first node to which the positive rectification voltage of the full-wave rectification is output, the resistor for adjusting the magnitude of the positive rectification voltage; And
And a diode for preventing backflow connected between the first node and a first output terminal of the first stabilization circuit. The method according to claim 13, wherein the second rectifying voltage supply unit is connected between the second node and the second current control unit outputting the negative polarity full-wave rectification voltage of the full-wave rectification unit to adjust the magnitude of the positive polarity full-wave rectification voltage; And
And a diode for preventing backflow connected between the second node and an output terminal of the first stabilization circuit. The method according to claim 13, wherein the first current control unit includes a switching element, the source terminal of the switching element is connected to the first node of the full-wave rectification unit to which the positive polarity full-wave rectification voltage is supplied, the gate terminal of the switching element Is connected to the first output terminal of the first stabilization circuit, the drain terminal of the switching element is a light emitting diode driving circuit connected to the cathode of the light emitting diode module. The method according to claim 13, wherein the second current control unit includes a switching element, the source terminal of the switching element is connected to the second node of the full-wave rectification unit to which the negative polarity full-wave rectification voltage is supplied, the gate terminal of the switching element Is connected to the anode of the light emitting diode module, the drain terminal of the switching element is a light emitting diode driving circuit connected to the second output terminal of the first stabilization circuit. 19. The LED driving circuit according to claim 17 or 18, wherein the switching element is a depletion type metal-oxide semiconductor field-effect transistor (MOSFET). The LED driving circuit of claim 13, wherein the current control unit includes a switching element, and further includes a third stabilization circuit connected in parallel to the gate terminal and the source terminal of the switching element. The method according to claim 13, A fifth stabilization circuit for blocking a certain voltage or more at the full-wave rectified voltage supplied from the second rectified voltage supply unit and a sixth stabilization circuit for blocking a certain voltage or more at the full-wave rectified voltage supplied from the first rectified voltage supply unit Light-emitting diode driving circuit further comprising. The method according to claim 13, The current control unit LED driving circuit further comprises a temperature resistance. 14. The LED driving circuit of claim 13, wherein the current control unit comprises an n-type or p-type switching element. A power supply unit providing an AC voltage;
A full-wave rectifying unit for full-wave rectifying the AC voltage from the power supply unit;
A first stabilization circuit stabilizing the full-wave rectification voltage from the full-wave rectification unit to a first DC voltage;
A current control unit that adjusts a driving current according to the level of the AC voltage using the full-wave rectifying voltage and the first DC voltage; And
And a rectifying voltage supply unit supplying the full-wave rectification voltage to the current control unit,
The current control unit includes an enhanced metal-oxide semiconductor field-effect transistor (MOSFET),
The current control unit includes a switching element,
The switching element is a light emitting diode driving circuit, the source terminal is connected to the full-wave rectification unit to receive the full-wave rectification voltage, one of the gate terminal and the drain terminal is connected to the first stabilization circuit to receive the first DC voltage.

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