WO2018207981A1

WO2018207981A1 - Load driving device and led device including same

Info

Publication number: WO2018207981A1
Application number: PCT/KR2017/012088
Authority: WO
Inventors: 류태하; 정동열
Original assignee: 주식회사 웰랑
Priority date: 2017-05-12
Filing date: 2017-10-30
Publication date: 2018-11-15

Abstract

Disclosed is a load driving device. A load driving device according to an embodiment of the present disclosure may comprise: a conversion circuit for generating a first voltage as an output signal on the basis of an input voltage; a calibration capacitor which is connected to the conversion circuit, and performs a charging or discharging operation on the basis of at least a part of the first voltage; an energy transferring circuit which is connected to the calibration capacitor to receive at least a part of the first voltage, and outputs a second voltage to a load on the basis of the at least a part of the first voltage; and a current source which has one end connected to the energy transferring circuit and the other end connected to the conversion circuit, and provides a calibration current to the conversion circuit.

Description

Load driving device and LED device including the same

Technical aspects of the present disclosure relate to a load driving apparatus, and more particularly, to a load driving apparatus with improved power factor and an LED apparatus including the same.

Semiconductor light emitting devices include devices such as LEDs (Light Emitting Diodes), and have various advantages such as low power consumption, high luminance, and long lifetime, and the use area of the semiconductor light emitting device is increasing as a light source. In recent years, the proportion of adopting LEDs instead of conventional fluorescent lamps and halogen lamps is increasing for indoor and outdoor lighting systems.

When a lighting apparatus is implemented using an LED, a driving apparatus for driving the LED module is required. The operation characteristics of the respective LED elements are not all the same, and the drive voltage or drive current supplied to the LED module may not be constant. Thus, a driving apparatus with improved performance is required.

The technical idea of the present disclosure provides a load driving device for supplying a current / voltage to a load such as an LED module with an improved power factor and an LED device including the same.

According to an aspect of the present invention, there is provided a load driving apparatus including: a conversion circuit that generates a first voltage as an output signal based on an input voltage; A calibration capacitor coupled to the conversion circuit, the calibration capacitor performing a charging or discharging operation based on at least a portion of the first voltage; An energy transfer circuit coupled to the calibration capacitor to receive at least a portion of the first voltage and to output a second voltage to a load based on at least a portion of the first voltage; And a current source coupled to the energy transfer circuit and to the conversion circuit, respectively, and to provide the calibration current to the conversion circuit.

According to an exemplary embodiment of the present disclosure, the current source may output a current having a phase substantially the same as the phase of the first voltage as the calibration current.

According to an exemplary embodiment of the present disclosure, a load driving apparatus includes a first control signal for controlling operation of the energy transfer circuit, based on a voltage level applied to at least one of the calibration capacitor and the current source, And a first control circuit for outputting the control signal to the circuit.

According to an exemplary embodiment of the present disclosure, an energy transfer circuit includes a switch-mode power supply comprising one or more switches, the first control signal controlling the turn-on and turn-off of the one or more switches .

According to an exemplary embodiment of the present disclosure, a controller is configured to control a current flowing through the current source to a second control signal that controls an output of the current source based on at least one of the first voltage, the second voltage, And a second control circuit for outputting the second control signal.

According to an exemplary embodiment of the present disclosure, the conversion circuit may include a rectification circuit for rectifying the input voltage and outputting it as the first voltage.

According to an exemplary embodiment of the present disclosure, the calibration capacitor and the current source may be connected in series, and the energy transfer circuit may be connected in parallel with the calibration capacitor.

According to an exemplary embodiment of the present disclosure, the energy transfer circuit may output the second voltage to a load, one end connected to the calibration capacitor and the other end connected to the current source, respectively.

There is provided an LED driving apparatus including a first circuit and an energy transfer circuit connected to the first circuit for transferring energy to an LED module according to an aspect of the technical idea of the present disclosure, A converter circuit for generating a first voltage as an output signal; A calibration capacitor for receiving at least a portion of the first voltage and performing a charge or discharge operation based on at least a portion of the first voltage; And a current source outputting a loop current of the first circuit, wherein the energy transfer circuit is supplied with at least a portion of the first voltage, and supplies a second voltage to the LED module based on at least a portion of the first voltage Can be output.

According to an exemplary embodiment of the present disclosure, an energy transfer circuit includes a DC-DC converter including a switch whose turn-on / turn-off is controlled based on a voltage level applied to one of the calibration capacitor and the current source can do.

According to an exemplary embodiment of the present disclosure, the current source may output a current having a phase substantially equal to the phase of the first voltage as the loop current.

According to an exemplary embodiment of the present disclosure, an LED driving apparatus includes a first control signal for controlling an operation of the energy transfer circuit based on a voltage level applied to at least one of the calibration capacitor and the current source, And a first control circuit for outputting the control signal to the circuit.

According to an exemplary embodiment of the present disclosure, a controller may control a second control signal to control an output of the current source based on at least one of the first voltage, the second voltage, and the current applied to the LED module, And a second control circuit for outputting the second control signal.

According to an exemplary embodiment of the present disclosure, an LED driving apparatus includes a dimming control unit that receives a dimming signal from the outside and outputs a dimming control signal for performing dimming control of the LED module based on the dimming signal to the second control circuit And the second control circuit may output the second control signal further based on the dimming control signal.

According to an exemplary embodiment of the present disclosure, the first circuit may further include a switch disposed between the calibration capacitor and the current source.

According to an exemplary embodiment of the present disclosure, one end of the current source may be coupled to the calibration capacitor and the other end to the conversion circuit.

According to an exemplary embodiment of the present disclosure, the energy transfer circuit may be connected in parallel with the calibration capacitor.

According to an exemplary embodiment of the present disclosure, the first circuit may be coupled to the LED module.

According to an exemplary embodiment of the present disclosure, at least one of the conversion circuit, the calibration capacitor, and the current source may form a closed circuit with the LED module.

According to an exemplary embodiment of the present disclosure, a load driving apparatus with improved power factor and harmonic distortion characteristics can be provided.

In addition, the LED driving apparatus according to the exemplary embodiment of the present disclosure improves the electro-magnetic interference (EMI) characteristics with high electro-optic conversion efficiency, so that a separate EMI filter can be omitted, .

Further, according to the exemplary embodiment of the present disclosure, it is possible to provide a high-efficiency load driving apparatus in which heat generation due to the driving of circuit elements is suppressed and the driving life is improved.

The effects obtainable in the exemplary embodiments of the present disclosure are not limited to the effects mentioned above, and other effects not mentioned will be apparent from the following description, given the general knowledge in the art to which the exemplary embodiments of the present disclosure belong Can be clearly derived and understood by those who have it. That is, by those of ordinary skill in the art from the exemplary embodiments of the present disclosure.

1 is a schematic block diagram of an electronic device according to an exemplary embodiment of the present disclosure;

2A to 2D are views for explaining a driving apparatus according to an exemplary embodiment of the present disclosure.

Figure 3 shows a block diagram of a drive according to an exemplary embodiment of the present disclosure;

4A to 4D are views for explaining a driving apparatus according to an exemplary embodiment of the present disclosure.

5 shows a specific circuit diagram of a drive device according to another exemplary embodiment of the present disclosure.

6 shows a specific circuit diagram of a load driving device according to another exemplary embodiment of the present disclosure.

Figure 7 shows a block diagram of a drive according to an exemplary embodiment of the present disclosure;

Figure 8 shows a block diagram of a drive according to an exemplary embodiment of the present disclosure;

9 shows a block diagram of a drive according to an exemplary embodiment of the present disclosure;

10A to 10C are views for explaining a driving apparatus according to an exemplary embodiment of the present disclosure;

11A and 11B are views showing a lighting device according to an exemplary embodiment of the present disclosure.

12 is a block diagram illustrating an illumination system including a driver according to an exemplary embodiment of the present disclosure;

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art. The present invention is capable of various modifications and various forms, and specific embodiments are illustrated and described in detail in the drawings. It should be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for similar elements in describing each drawing. In the accompanying drawings, the dimensions of the structures are enlarged or reduced from the actual dimensions for the sake of clarity of the present invention.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, the terms "comprises", "having", and the like are used to specify that a feature, a number, a step, an operation, an element, a part or a combination thereof is described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Referring to FIG. 1, the electronic device 10 may include a power source PS, a load driving device 100, and a load LO. The power supply PS supplies the input voltage V _AC to the load driving apparatus 100 and the load driving apparatus 100 can appropriately convert the supplied input voltage V _AC to drive the load LO have. For example, the input voltage V _AC may be an _AC voltage. The load driving apparatus 100 can supply the driving voltage to the load LO based on the input voltage V _AC to drive the load LO.

The load driving apparatus 100 may include a plurality of terminals T_L. For example, the load driving apparatus 100 is connected to the load LO through a plurality of terminals T_L and supplies a driving voltage and / or a driving current to the load LO via the plurality of terminals T_L Can supply. For example, the load current i _L can be applied from the load driving device 100 to the load LO through the plurality of terminals T_L.

In this figure, the number of terminals T_L is shown as two, but is not limited thereto. In the figure, the terminals T_L are electrically connected to the energy transfer circuit 120 and are not directly connected to the first circuit 110, however, the present invention is not limited thereto. In other words, at least one of the terminals T_L may be electrically connected to the energy transfer circuit 120 and the first circuit 110.

The load driving apparatus 100 may include an energy transfer circuit 120 connected to the first circuit 110 and the first circuit 110. The first circuit 110 may receive an input voltage (V _AC) and outputting electrical energy based on the input voltage (V _AC), the energy transfer circuit 120. For example, the first circuit 110 may rectify the input voltage V _AC and output it to the energy transfer circuit 120.

In an exemplary embodiment, the first circuit 110 comprises a conversion circuit for generating a first voltage as an output signal based on an input voltage (V _AC ), a calibration circuit for performing a charging or discharging operation based on the first voltage A capacitor and a conversion circuit, and a current source coupled to the calibration capacitor and outputting a calibration current. In one example, the current source may output a current having substantially the same phase as the rectified input voltage V _AC as a calibration current. A detailed description thereof will be described later.

The energy transfer circuit 120 may be electrically connected to the first circuit 110 and may transfer the electrical energy output from the first circuit 110 to the load LO. In the drawing, the load LO is electrically connected to the energy transfer circuit 120 and is not directly connected to the first circuit 110, but is not limited thereto. In other words, the load LO may be electrically connected to the energy transfer circuit 120 and the first circuit 110.

In an exemplary embodiment, the energy transfer circuit 120 may be turned on or off based on the electrical state of the first circuit 110. In one example, based on the voltage level applied to the calibration capacitor or current source included in the first circuit 110, the energy transfer circuit 120 may perform an energy transfer operation. A detailed description thereof will be described later.

The load LO can be driven by receiving electrical energy from the load driving apparatus 100. [ The load (LO) may be, for example, a light emitting diode (LED) module. The load LO may consume all or a part of the electric energy supplied from the load driving apparatus 100. [ The load (LO), for example, may consume the supplied electrical energy as light energy and / or heat energy. Hereinafter, embodiments of the present disclosure will be described by taking the case where the load (LO) is an LED module, but it will be understood that the technical idea of the present disclosure is not limited thereto.

2A to 2D are diagrams for explaining a load driving apparatus according to an exemplary embodiment of the present disclosure. Specifically, FIGS. 2A and 2B are block diagrams of a load driving apparatus according to an exemplary embodiment of the present disclosure, and FIGS. 2C and 2D are graphs showing waveforms of voltage or current for each configuration of a load driving apparatus, do. For example, FIGS. 2A to 2D may be views for specifically describing the load driving apparatus 100 of FIG.

Referring to FIG. 2A, the load driving apparatus 100 may include an energy transfer circuit 120 connected to the first circuit 110 and the first circuit 110. The first circuit 110 may include a conversion circuit 112, a calibration capacitor 114 and a current source 116. In the exemplary embodiment, converter circuit 112 may comprise a rectifier circuit for being supplied with an input voltage (V _AC), rectifies the input voltage (V _AC) output to a first voltage (V _s) . For example, when the input voltage V _AC is an AC voltage having a first frequency, the first voltage V _s may have a second frequency that is different from the first frequency. As an example, the second frequency may be twice the first frequency.

The calibration capacitor 114 is coupled to the conversion circuit 112 and is capable of receiving at least a portion of the first voltage V _s . Calibration capacitor 114 may perform a charge or discharge operation based on at least a portion of the first voltage V _s . In an exemplary embodiment, in a period during which the energy transfer circuit 120 is turned on, the voltage V _CB applied to the calibration capacitor 114 may be approximately the same as the first voltage V _s .

The current source 116 is connected to the conversion circuit 112 and the calibration capacitor 114 and is capable of outputting the calibration current i _s delivered to the conversion circuit 112. Specifically, one end of the current source 116 may be connected to the conversion circuit 112 and the other end may be connected to the calibration capacitor 114. In an exemplary embodiment, the current source 116 may output a current having a phase substantially the same as the phase of the first voltage V _s as the calibration current i _S. The calibration current i _s may be termed the loop current of the first circuit 110.

In an exemplary embodiment, as the current source 116 outputs the calibration current i _S , it is transferred back to the load LO via the energy transfer circuit 120 based on the first voltage V _s , The current can be limited based on the calibration current (i _S ). For example, as the current source 116 outputs a current having the same phase as the first voltage V _s as a calibration current i _S , the load driving apparatus 100 has an improved power factor pf, Lt; / RTI >

Energy transfer circuit 120 is first to the first circuit 110 is connected to a first voltage (V _s) at least a load (LO), at least on the basis of a part of receiving the supply part, a first voltage (V _s) of the 2 It is possible to output the voltage (V _O ) and the load current (i _L ). Hereinafter, in the present specification, the load current i _L may mean a current applied to the imaginary load through the terminals T_L under the assumption that there is a load (for example, LO in Fig. 1).

The energy transfer circuit 120 may be connected in parallel with the calibration capacitor 114. In an exemplary embodiment, the energy transfer circuit 120 may include a switch-mode power supply (SMPS) including one or more switches. For example, the energy transfer circuit 120 may include a buck converter, a boost converter, a buck-boost converter, a flyback converter, and a forward converter. And a DC-DC converter (DC-DC converter) including at least one of a converter structure such as a DC-DC converter.

In an exemplary embodiment, the energy transfer circuit 120 is turned on or off based on a voltage (V _CB ) applied to the calibration capacitor 114 or a voltage (V _AK ) applied to the current source 116 . Specifically, when the energy transfer circuit 120 includes a switch-mode power supply including one or more switches, the voltage V _CB applied to the calibration capacitor 114 or the voltage V _AK applied to the current source The switch may be turned on or off.

For example, when the voltage V _CB applied to the calibration capacitor 114 is less than a predetermined reference voltage, the energy transfer circuit 120 may be turned off. Further, if the voltage V _CB applied to the calibration capacitor 114 is greater than or equal to a predetermined reference voltage, the energy transfer circuit 120 may be turned on.

Referring to Fig. 2B, the configuration of the load driving apparatus 100a is similar to that of the load driving apparatus 100 described with reference to Fig. 2A. However, according to the present embodiment, the load driving apparatus 100 may further include the switch 115a in the first circuit 110a. In an exemplary embodiment, the switch 115a may be disposed between the calibration capacitor 114a and the current source 116a. The switch 115a may comprise one or more transistors. The switch 115a can disperse stresses such as internal pressure, for example, during the electrical operation of the first circuit 110a.

With reference to FIG. 2A or 2B and FIG. 2C, the electrical state of each configuration included in the load driving apparatus 100 is shown. For example, if the angular velocity of the input voltage (V _AC )

And the time is represented by t, the first voltage V _s is expressed by the following equation (1), and the calibration current i _s is expressed by the equation (2) The voltage V _CB of the calibration capacitor 114 can be expressed by Equation (3), respectively.

In Equations (1) to (3), V _S and I _S are proportional constants and C _B can be the capacitance of the calibration capacitor 114. For example, the change of the first voltage V _{s with} time and the voltage V _CB of the calibration capacitor 114 may be as shown in FIG. 2C.

In Figure 2c, V _CB < V _s The first interval (T _C ), V _CB > = V _s And the second interval T _P may be defined as a second interval T _P. For example, the energy transfer circuit 120 may be turned off at the first section T _C and turned on at the second section T _P. A first interval (T _C) Voltage (V _CB), of the energy transfer circuit 120 does not operate, the calibration capacitor 114 and the current flowing through the current source 116 is the same, the calibration capacitor 114 in the [Math (3).

In the second section T _P , the voltage V _CB of the calibration capacitor 114 may be larger than the first voltage V _s when following Equation (3). However, since the voltage greater than the first voltage V _s can not be charged in the calibration capacitor 114 and the energy transfer circuit 120 is turned on in the second period T _P , the second period T _P , the voltage V _CB of the calibration capacitor 114 may be approximately equal to the first voltage V _s .

In an exemplary embodiment, in the second section T _P , the energy transfer circuit 120 transfers energy corresponding to the first region RG1 to the load LO and the voltage V (V) of the calibration capacitor 114 _CB and the first voltage V _s are approximately equal to each other. For example, the current flowing in the calibration capacitor 114 in the second section T _P can be expressed by the following equation (4).

2D, waveforms of current or voltage in each configuration of the load driving device 100 are shown for the first section T _{C &lt}; the second section T _P. For example, the condition of the first section T _{C &lt}; the second section T _P can be established when I _S > C _B in the equation (3). For example, if C _B is at the level of several hundreds nF and the calibration current (i _S ) is at the mA level, I _S >> C _B Condition can be satisfied. However, the present invention is not limited thereto.

A voltage drop may occur across the current source 116 in the first section T _C when the conditions of the first section T _C and the second section T _P are established. However, even if the voltage drop across the current source (116) generating a first time period (T _C) << second interval (T _P), and the current flowing through the current source 116 is very small, since the first interval (T _C) And the second section T _P , the loss occurring in the current source 116 may be negligibly small. 2D, when the first section T _C is the second section T _P , the load driving apparatus 100 can transfer energy to the load LO with a power factor close to unity have.

In an exemplary embodiment, the current i _P flowing to the energy transfer circuit 120, P _ETU , which is the power supplied to the energy transfer circuit 120, and P _O , the power supplied to the load LO, (5) < / RTI >

In Equation (5)

May represent energy transfer efficiency from the energy transfer circuit 120 to the load LO. For example, when the power supplied from the converting circuit 112 is P _S and the loss occurring in the current source 116 is small based on the conditions of the first section T _C and the second section T _P , The overall efficiency of the load driving apparatus 100 according to the exemplary embodiment of the present disclosure is the efficiency of the energy transfer circuit 120

.

The load driving apparatus according to the embodiment of the present disclosure includes a current source that outputs a calibration current whose input voltage has the same phase as the rectified voltage (for example, the first voltage V _S ), so that the power factor and the harmonic distortion The characteristics can be improved. Further, in the case of the LED driving device in which the load driving device supplies the driving current / voltage to the LED module, the electromagnetic wave interference characteristic is improved and the EMI filter is omitted, Can be reduced. Further, the load driving device according to the embodiment of the present disclosure can suppress the heat generation due to the driving of the circuit elements, and the driving life can be improved.

3 shows a block diagram of a load driving device according to an exemplary embodiment of the present disclosure; Among the configurations shown in Fig. 3, duplicate descriptions will be avoided in comparison with Figs. 2A to 2D.

Referring to FIG. 3, the load driving apparatus 200 may further include a controller 230. The controller 230 may include a first control circuit 232 and a second control circuit 234. The first control circuit 232 controls the operation of the energy transfer circuit 220 based on the voltage (V _CB ) level applied to the calibration capacitor 214 or the voltage (V _AK ) level applied to the current source 216 can do.

In an exemplary embodiment, the first control circuit 232 is based on a voltage (V _CB ) applied to the calibration capacitor 214 or a voltage (V _AK ) applied to the current source 216, The first control signal CTRL_1 for controlling the turn-on and turn-off of the power supply 220 can be output to the energy transfer circuit 220. In one example, when the energy transfer circuit 220 includes a switch-mode power supply including a switch, the first control circuit 232 outputs a first control signal CTRL_1 to the switch, Turn-off can be controlled. In an exemplary embodiment, the first control circuit 232 controls the energy transfer circuit 220 to be turned off when the voltage V _CB applied to the calibration capacitor 214 is less than a predetermined reference voltage, The energy transfer circuit 220 can be controlled to be turned on when the voltage V _CB applied to the calibration capacitor 214 is equal to or greater than a predetermined reference voltage.

The second control circuit 234 is connected to at least one of the first voltage V _s , the second voltage V _o and the current delivered from the energy transfer circuit 220 to the load (for example, LO in Fig. 1) The output of the current source 216 can be controlled. In this figure, the second control circuit 234 outputs the first voltage V _S , the second voltage V _O , and the current delivered from the energy transfer circuit 220 to the load (for example, LO in FIG. 1) The output of the current source 216 is controlled based on the output signal of the current source 216. However, the present invention is not limited thereto.

In an exemplary embodiment, the second control circuit 234 is coupled to the first voltage V _s , the second voltage V _o , and the load (e.g., LO in Fig. 1) in the energy transfer circuit 220 A second control signal CTRL_2 that controls the current source 216 to output a calibration current i _S having the same phase as the first voltage V _S , based on at least one of the currents to be transmitted, As shown in FIG. For example, the second control circuit 234 may control the first voltage V _s , the second voltage V _o , and the current delivered from the energy transfer circuit 220 to the load (e.g., LO in Fig. 1) The second control signal CTRL_2 can be output to the current source through a linear operation such as adding or multiplying control signals based on the control signal CTRL_2 and / or a nonlinear operation.

The second control circuit 234 can control the current source 216 to improve the power factor of the load driving device 200. [ The second control circuit 234 also controls the current source 216 to maintain the current flowing in the LED or the voltage across the LED constant if the load (e.g., LO in Figure 1) is an LED module So that a stable optical output can be obtained. The second control circuit 234 also controls the current source 216 to control the dimming operation by reducing or increasing the current flowing through the LEDs included in the load (e.g., LO in Figure 1) It is possible.

4A to 4D are views for explaining a load driving apparatus according to an exemplary embodiment of the present disclosure; Specifically, FIGS. 4A and 4B show respective circuit diagrams of a load driving apparatus according to an exemplary embodiment of the present disclosure, FIG. 4C shows an equivalent circuit of a first circuit and an energy transfer circuit in an energy transfer circuit operation, And waveforms of voltage and current according to turn-on / turn-off, respectively. Among the configurations disclosed in Figs. 4A to 4D, duplicate descriptions will be avoided in comparison with Figs. 2A to 2D.

Referring to FIG. 4A, the load driving apparatus 300 may include a first circuit 310, an energy transfer circuit 320, and a controller 330. The first circuit 310 may include a conversion circuit 312, a calibration capacitor 314, and a current source 316. The energy transfer circuit 320 may include a gate driver 322, a diode 324, an inductor 326 and a switch TR1. In addition, the controller 330 may include a first control circuit 332 and a second control circuit 334.

The gate driver 322, the diode 324, the inductor 326 and the switch TR1 included in the energy transfer circuit 320 may form, for example, a buck-boost converter structure. The energy transfer circuit 320 transfers at least a portion of the energy received from the input voltage V _AC to the load (e.g., LO in FIG. 1), based on the turn-on and turn-off of the switch TR1 .

The first control circuit 332 on the basis of the current source sensing a voltage (V _AK) is applied to 316, and a predetermined first reference voltage (Vref1) and a voltage (V _AK) is applied to the current source 316. Energy The hysteresis control may be performed on the transfer circuit 320. For example, when the voltage (V _AK ) level reaches the downward margin level of the first reference voltage (V ref1), the first control circuit 332 turns the switch TR1 on via the gate driver 322 The energy charged in the calibration capacitor 314 can be transferred to the inductor 326. [ Further, when the voltage (V _AK ) level reaches the upward margin level of the first reference voltage Vref1, the first control circuit 332 turns off the switch TR1 through the gate driver 322, The calibration capacitor 314 can be charged through the calibration current i _s output from the current source 316. [ At this time, the energy stored in the inductor 326 can be transferred to a load (for example, LO in FIG. 1), so that the one cycle operation of the energy transfer circuit 320 can be completed.

In other words, the first control circuit 332 can control the switch TR1 so that the voltage V _AK does not deviate from the predetermined range up and down about the first reference voltage Vref1. However, the hysteresis control is one example of the control for the switch TR1, and the control scheme of the present disclosure is not limited thereto.

The second control circuit 334 can control the current outputted from the current source 316 to be kept constant in proportion to the first voltage V _s . Further, the second control circuit 334 can control so that the current flowing to the load (for example, LO in Fig. 1) is kept constant in proportion to the second reference voltage Vref2.

The second control circuit 334 may further include a multiplier (MP). In an exemplary embodiment, the second control circuit 334 detects the load current i _L and converts it into a voltage, and outputs the difference between the converted voltage and a predetermined second reference voltage Vref2 as an error amplifier amplifier. In addition, the second control circuit 334 is a current source 316, via a first voltage (V _S), a multiplier (MP) receiving a sensing and sensing a first voltage (V _S) and an output of the error amplifier to Can be controlled.

Although the second control circuit 334 in this embodiment is shown as controlling the current source 316 based on the load current i _L , this is for convenience of illustration only, but is not limited thereto. That is, the second control circuit 334 may control the current source 316 based on the voltage applied to the load (e.g., LO in Fig. 1) or may control the load current i _L and the load For example, the current source 316 may be controlled based on the voltage applied to LO in FIG.

Although the multiplier MP is included in the second control circuit 334 in the present embodiment, the multiplier MP is not limited thereto. The multiplier MP may be configured separately from the second control circuit 334. Further, the multiplier MP may be replaced by an adder, a subtractor, or a combination with the above configurations.

Referring to Fig. 4B, the configuration of the load driving device 300a is similar to that of the load driving device 300 described with reference to Fig. 4A. However, according to the present embodiment, the load driving apparatus 300a may further include a switch 315a in the first circuit 310a. In an exemplary embodiment, the switch 315a may be disposed between the calibration capacitor 314a and the current source 316a. The switch 315a may comprise one or more transistors. The switch 315a can disperse the stress such as internal pressure, for example, during the electrical operation of the first circuit 310a.

Referring to Figures 4A and 4B and Figures 4C and 4D further, energy can be transferred to the load capacitor CL upon repetition of turn-on / turn-off of the switch TR1 during operation of the energy transfer circuit 320 have. The load capacitor CL may be a configuration that replaces a load (for example, LO in FIG. 1) for convenience of explanation. For example, the equivalent circuit of Figure 4c may be an equivalent circuit of the first circuit 310 and the energy transfer circuit 320 in the second interval (T _P in Fig. 2c and 2d).

In the exemplary embodiment, when the frequency of the first voltage V _S and the switching frequency of the switch TR 1 are satisfied, the first voltage V _S and the calibration current i _S ) can be assumed to be DC, respectively. The voltage V _CB of the calibration capacitor 314 may be applied across the inductor 326 in the first mode section MD1 in which the switch TR1 is turned on. Accordingly, energy stored in the form of a voltage on the calibration capacitor 314 can be transferred to the inductor 326 in the form of a current.

The switch TR1 is then turned off in the second mode section MD2 and the energy stored in the form of current in the inductor 326 may be transferred to the load capacitor CL via the diode 324. [ In other words, the inductor 326 current i _L is applied to the load capacitor CL via the diode 324, so that the second voltage V _O can be output.

Next, the third mode section MD3 may be defined from the completion of the energy transfer of the inductor 326 to the turn-on point of the switch TR1. For example, in the second and third mode sections MD2 and MD3, the calibration current i _S can charge the calibration capacitor 314. The average of the voltage V _CB of the calibration capacitor 314 in the first to third mode sections MD 1 to MD 3 may be approximately equal to the first voltage V _S.

In this figure, the energy transfer circuit 320 is operated in the Discontinuous Conduction Mode (DCM) in the presence of the third mode section MD3, but is not limited thereto. That is, the energy transfer circuit 320 may operate in a continuous conduction mode (CCM) in which the third mode section MD3 is omitted.

5 shows a specific circuit diagram of a load driving device according to another exemplary embodiment of the present disclosure. Among the configurations shown in FIG. 5, duplicate descriptions will be avoided in comparison with FIG. 4A.

Referring to FIG. 5, the load driving apparatus 400 may include a first circuit 410, an energy transfer circuit 420, and a controller 430. The energy transfer circuit 420 may include a gate driver 422, a diode 424, an inductor 426 and a switch TR2. The gate driver 422, the diode 424, the inductor 426 and the switch TR2 included in the energy transfer circuit 420 may form, for example, a buck converter structure. The energy transfer circuitry 420 transfers at least a portion of the energy received from the input voltage V _AC to the load (e.g., LO in FIG. 1), based on the turn-on and turn-off of the switch TR2 .

6 shows a specific circuit diagram of a load driving device according to another exemplary embodiment of the present disclosure. Among the configurations shown in Fig. 6, duplicate descriptions will be avoided in comparison with Fig. 4A.

Referring to FIG. 6, the load driving apparatus 500 may include a first circuit 510, an energy transfer circuit 520, and a controller 530. The energy transfer circuit 520 may include a gate driver 522, a first diode 524, a second diode 525, a transformer 527 and a switch TR3. The gate driver 522, the first diode 524, the second diode 525, the transformer 527 and the switch TR3 included in the energy transfer circuit 520 form a flyback converter structure, for example, . The energy transfer circuit 520 transfers at least a portion of the energy received from the input voltage V _AC to the load (e.g., LO in Figure 1), based on the turn-on and turn-off of the switch TR3 .

7 shows a block diagram of a load driving device according to an exemplary embodiment of the present disclosure; Among the configurations shown in FIG. 7, duplicate descriptions will be avoided in comparison with FIG.

Referring to FIG. 7, the load driving apparatus 600 may further include a dimming controller 640. The dimming controller 640 may be a LED driver that is a load (e.g., LO in Figure 1) based on the dimming signal (DIM) when the load driver 600 drives the LED module. It is possible to control the dimming operation.

In an exemplary embodiment, the dimming controller 640 receives a dimming signal (DIM) from the outside of the load driver 600 and, based thereon, outputs a dimming control signal CTRL_DIM to the second control circuit 634 can do. For example, when the second control circuit 634 controls the current flowing to the LED module to remain constant in proportion to the second reference voltage (e.g., Vref2 in FIG. 4), the dimming controller 640 controls the dimming To the second control circuit 634, a dimming control signal CTRL_DIM that controls the level of the second reference voltage (e.g., Vref2 in FIG. 4) based on the signal DIM. However, this is an example for dimming control, and the dimming controller 640 may have various configurations for controlling current or voltage applied to the LED module.

8 shows a block diagram of a load driving device according to an exemplary embodiment of the present disclosure; Among the configurations shown in Fig. 8, duplicate descriptions will be avoided in comparison with Figs. 2A to 2D.

Referring to FIG. 8, the load driving apparatus 700 may include a first circuit 710 and an energy transfer circuit 720. The first circuit 710 may include a conversion circuit 712, a calibration capacitor 714, and a current source 716. The energy transfer circuit 720 is based on at least a portion of the first connected to the circuit 710 being supplied to at least a portion of the first voltage (V _S), the first voltage (V _S), second to the load (not shown) 2 < / RTI &_gt; voltage (V _O ).

In an exemplary embodiment, the energy transfer circuit 720 may output a second voltage (V _O ) to a load (not shown) coupled to the first circuit 710. In one example, the energy transfer circuit 720 can output a second voltage (V _O ) to a load (not shown), one end connected to a calibration capacitor 714 and the other end connected to a current source 716 . In other words, a load (not shown) in which the energy transfer circuit 720 outputs the second voltage V _{O is} connected to at least one of the conversion circuit 712, the calibration capacitor 714, and the current source 716, circuit can be formed. The load (not shown) is connected to the calibration capacitor 714 and the current source 716 so that the stress that the device (e.g., the inductor) contained in the calibration capacitor 714 and the energy transfer circuit 720 can withstand have. Thus, the electrical stability of the load driving apparatus 700 can be improved.

9 shows a block diagram of a load driving device according to an exemplary embodiment of the present disclosure; Among the configurations shown in FIG. 9, duplicate descriptions will be avoided in comparison with FIG.

Referring to FIG. 9, the load driving apparatus 800 may further include a controller 830. The controller 830 may include a first control circuit 832 and a second control circuit 834. The first control circuit 832 is connected to the power supply circuit 820 based on at least one level of the voltage V _CB applied to the calibration capacitor 814 and the voltage V _AK applied to the current source 816 The operation can be controlled.

In an exemplary embodiment, the first control circuit 832 is coupled to the energy transfer circuit 814 based on the level of the voltage (V _CB ) applied to the calibration capacitor 814 or the voltage (V _AK ) applied to the current source 816, To the energy transfer circuit 820, a first control signal CTRL_1 for controlling the operation of the power supply circuit 820. [ In one example, when the energy transfer circuit 820 includes a switch-mode power supply including a switch, the first control circuit 832 outputs a first control signal CTRL_1 to the switch, Turn-off can be controlled. In an exemplary embodiment, the first control circuit 832 controls the energy transfer circuit 820 to be turned off when the voltage V _CB applied to the calibration capacitor 814 is less than a predetermined reference voltage, The energy transfer circuit 820 can be controlled to be turned on when the voltage V _CB applied to the calibration capacitor 814 is equal to or greater than a predetermined reference voltage.

The second control circuit 834 may control the output of the current source 816 based on at least one of the first voltage V _s , the second voltage V _o and the load current i _L. Although the second control circuit 834 is shown in the figure to control the output of the current source 816 based on the first voltage V _s , the second voltage V _o and the load current i _L , This is for convenience of explanation, but is not limited thereto.

In an exemplary embodiment, the second control circuit 834 includes at least one of the first voltage V _s , the second voltage V _o , and the current delivered to the load (not shown) in the energy transfer circuit 820 To the current source 816, a second control signal CTRL_2 that controls the current source 816 to output a calibration current i _S having the same phase as the first voltage V _{S based} on the first control signal CTL_2. In one example, the second control circuit 834 may add control signals based on the first voltage (V _s ), the second voltage (V _o ), and the current delivered to the load (not shown) in the energy transfer circuit 820 And can output the second control signal CTRL_2 suitable for the purpose as a current source.

The second control circuit 834 controls the current source 816 to improve the power factor of the load driving device 800. [ The second control circuit 834 controls the current source 816 to maintain the current flowing in the LED or the voltage across the LED constant, for example, when the load (not shown) is an LED module, Can be obtained. The second control circuit 834 may also control the current source 816 to control the dimming operation by reducing or increasing the current flowing through the LEDs included in the load (not shown).

10A to 10C are views for explaining a load driving apparatus according to an exemplary embodiment of the present disclosure; Specifically, FIG. 10A is a block diagram of a load driving apparatus according to an exemplary embodiment of the present disclosure, FIG. 10B shows an equivalent circuit of the first circuit and the energy transfer circuit in the operation of the energy transfer circuit, And waveforms of voltage and current with on / off-off, respectively. Among the configurations disclosed in Figs. 10A to 10C, duplicate descriptions will be avoided in comparison with Fig.

Referring to FIG. 10A, the load driving apparatus 900 may include a first circuit 910, an energy transfer circuit 920, and a controller 930. The energy transfer circuit 920 may include a gate driver 922, a diode 924, an inductor 926 and a switch TR4. The gate driver 922, the diode 924, the inductor 926 and the switch TR4 included in the energy transfer circuit 920 can form, for example, a buck converter structure. The energy transfer circuit 920 can transfer at least a portion of the energy received from the input voltage V _AC to a load (not shown), based on the turn-on and turn-off of the switch TR4.

10B and 10C, energy can be transferred to the load capacitor CL in accordance with the repetition of the turn-on / turn-off of the switch TR4 in the operation of the energy transfer circuit 920. [ The load capacitor CL may be replaced with a load for convenience of explanation. For example, the equivalent circuit of FIG. 10B may be an equivalent circuit for the first circuit 910 and the energy transfer circuit 920 in the second period (T _{P in} FIGS. 2C and 2D).

In an exemplary embodiment, when the frequency of the first voltage V _S and the switching frequency of the switch TR4 are satisfied, the first voltage V _S and the calibration current i _S ) can be assumed to be DC, respectively. First, the voltage V _CB of the calibration capacitor 914 can be applied across the inductor 926 in the first mode section MD1 'in which the switch TR4 is turned on. Accordingly, the energy stored in the form of a voltage on the calibration capacitor 914 can be transferred to the inductor 926 in the form of a current.

Next, the switch TR4 is turned off in the second mode section MD2 ', and the energy stored in the form of current in the inductor 926 can be transferred to the load capacitor CL via the diode 924. [ In other words, the inductor 926 current i _L is applied to the load capacitor CL via the diode 924, so that the second voltage V _O can be output.

Next, the third mode section MD3 'may be defined from the completion of energy transfer of the inductor 926 to the turn-on point of the switch TR4. For example, in the second and third mode intervals MD2 ', MD3', the calibration current i _s can charge the calibration capacitor 914. The average of the voltage V _CB of the calibration capacitor 914 in the first to third mode sections MD 1 'to MD 3' is obtained by subtracting the second voltage V _O from the first voltage V _S , . &Lt; / RTI >

Although the third mode section MD3 'is shown in the figure, the energy transfer circuit 920 is operated in the discontinuous conduction mode, but the present invention is not limited thereto. That is, the energy transfer circuit 920 may operate in a continuous conduction mode in which the third mode section MD3 'is omitted.

11A and 11B are diagrams each illustrating a lighting apparatus according to an exemplary embodiment of the present disclosure; Referring to FIG. 11A, the lighting apparatus 1000 may include a socket 1010, a power source 1020, a heat sink 1030, a light source 1040, and an optical unit 1050.

Socket 1010 may be configured to be replaceable with a legacy lighting device. Electric power supplied to the lighting apparatus 1000 may be applied through the socket 1010, for example, an AC voltage may be applied to the socket 1010. [ As shown in FIG. 10, the power supply unit 1020 may be separately assembled into the first power supply unit 1021 and the second power supply unit 1022. For example, the first power supply section 1021 may include the conversion circuit 112 of FIG. 2A, and the second power supply section 1022 may include at least a portion of the load driving apparatus 100. [

The heat dissipation unit 1030 may include an internal heat dissipation unit 1031 and an external heat dissipation unit 1032. The internal heat dissipation unit 1031 may be directly connected to the light source 1040 and / Heat can be transmitted to the external heat dissipating unit 1032 through the heat dissipating unit 1032. [ The optical portion 1050 may include an inner optical portion (not shown) and an outer optical portion (not shown), and may be configured to evenly distribute the light emitted by the light source 1040.

The light source 1040 may receive power from the power source unit 1020 and emit light to the optical unit 1050. The light source 1040 may include a plurality of LED packages 1041, a circuit board 1042, and at least one integrated circuit package 1043. The at least one integrated circuit package 1043 may include at least some of the load driving devices according to the exemplary embodiments of the present disclosure.

The plurality of LED packages 1041 may be of the same type that emits light of the same wavelength. Or may be configured in a variety of different types that generate light of different wavelengths. For example, the LED package 1041 may be configured to include at least one of a light emitting element that emits white light by combining a phosphor of yellow, green, red, or orange color and a purple, blue, green, red, . In this case, the lighting apparatus 1000 can adjust the color rendering index (CRI) from the sodium (Na) or the like to the solar light level and can generate various white light at the color temperature from the candle (1500K) to the blue sky (12000K) If necessary, the illumination color can be adjusted to the ambient atmosphere or mood by generating visible light of purple, blue, green, red, or orange or infrared light. It may also generate light of a special wavelength that can promote plant growth.

Referring to Fig. 11B, the configuration of the lighting apparatus 1000a is similar to that of the lighting apparatus 1000 described with reference to Fig. 11A. However, according to the present embodiment, the first and

second power sources

1021 and 1022 described in FIG. 11A may be omitted in the illumination device 1000a. In addition, according to the present embodiment, the light source 1040a may include a passive device 1045a and a passive circuit package 1044a including various power sources. The integrated circuit package 1044a may include at least some of the load driving devices according to the exemplary embodiments of the present disclosure. The light source 1040a disclosed in this embodiment can be named, for example, as a drive on board (DOB) structure.

In accordance with the foregoing, the lighting apparatus 1000 may include a load driving apparatus according to an exemplary embodiment of the present disclosure. Thus, the lighting apparatus 1000 can improve the total harmonic distortion rate, power factor, and flicker characteristics while having high electro-optical conversion efficiency. In addition, the electromagnetic interference characteristic is improved, and a separate EMI filter can be omitted, so that the total volume may be reduced.

12 is a block diagram illustrating an illumination system including a load driver according to an exemplary embodiment of the present disclosure;

12, the illumination system 2000 may include a sensor device 2100, a control and communication device 2200, and a lighting device 2300 that include a plurality of sensors. The sensor device 2100 may include various sensors such as a humidity sensor 2110, an illuminance sensor 2120, a GPS sensor 2130, a motion sensor 2140, an optical sensor 2150 and a temperature sensor 2160 . Some of the sensors included in the sensor apparatus 2100 may be provided as one module together with the illumination apparatus 2300. [ The control and communication device 2200 may be communicatively coupled to the sensor device 2100 to receive various sensing information received from the sensor device 2100. The control and communication device 2200 may include various communication interfaces such as I2C, SPI, UART, DALI, RS485, etc., and the sensor device 2100 may be connected to at least one of the communication interfaces, ). &Lt; / RTI > The illumination device 2300 may include a light source 2310 including, for example, an LED, and a drive device 2320 for supplying a drive voltage / current, etc. to the light source 2310. In an exemplary embodiment, the driving device 2320 may include the driving device disclosed in Figures 1 through 9c.

The description of the embodiments above is merely exemplary in reference to the drawings for a more thorough understanding of the disclosure, and should not be construed as limiting the present disclosure. In addition, it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the basic principles of the present disclosure.

Claims

A conversion circuit for generating a first voltage as an output signal based on an input voltage;

A calibration capacitor coupled to the conversion circuit, the calibration capacitor performing a charging or discharging operation based on at least a portion of the first voltage;

An energy transfer circuit coupled to the calibration capacitor to receive at least a portion of the first voltage and to output a second voltage to a load based on at least a portion of the first voltage; And

And a current source coupled to the energy transfer circuit, the other end being connected to the conversion circuit, respectively, and providing a calibration current to the conversion circuit.
The method according to claim 1,

Wherein the current source outputs a current having a phase substantially identical to a phase of the first voltage as the calibration current.
The method according to claim 1,

And a first control circuit for outputting to the energy transfer circuit a first control signal for controlling an operation of the energy transfer circuit based on a voltage level applied to at least one of the calibration capacitor and the current source A load driving device.
The method of claim 3,

Wherein the energy transfer circuit comprises a switch-mode power supply comprising one or more switches,

Wherein the first control signal controls turn-on and turn-off of the one or more switches.
The method of claim 3,

The controller further includes a second control circuit for outputting a second control signal for controlling an output of the current source based on at least one of the first voltage, the second voltage, and the current applied to the load to the current source A load driving device.
The method according to claim 1,

And the conversion circuit includes a rectification circuit for rectifying the input voltage and outputting the rectified voltage as the first voltage.
The method according to claim 1,

Wherein the calibration capacitor and the current source are connected in series,

And the energy transfer circuit is connected in parallel with the calibration capacitor.
The method according to claim 1,

The energy transfer circuit includes:

And the second voltage is outputted to the load connected to the current source at the other end, and the calibration capacitor at the other end.
1. An LED driving apparatus comprising a first circuit and an energy transfer circuit connected to the first circuit for transferring energy to an LED (Light Emitting Diode) module,

The first circuit comprising:

A converter circuit for receiving an input voltage and generating a first voltage as an output signal;

A calibration capacitor for receiving at least a portion of the first voltage and performing a charge or discharge operation based on at least a portion of the first voltage; And

And a current source for outputting a loop current of the first circuit,

Wherein the energy transfer circuit receives at least a portion of the first voltage and outputs a second voltage to the LED module based on at least a portion of the first voltage.
10. The method of claim 9,

Wherein the energy transfer circuit includes a DC-DC converter including a switch whose turn-on / turn-off is controlled based on a voltage level applied to at least one of the calibration capacitor and the current source. .
10. The method of claim 9,

Wherein the current source outputs a current having a phase substantially identical to a phase of the first voltage as the loop current.
10. The method of claim 9,

And a first control circuit for outputting to the energy transfer circuit a first control signal for controlling an operation of the energy transfer circuit based on a voltage level applied to at least one of the calibration capacitor and the current source Lt; / RTI >
13. The method of claim 12,

The controller may further include a second control circuit for outputting a second control signal for controlling the output of the current source to the current source based on at least one of the first voltage, the second voltage, and the current applied to the LED module And the LED driving device.
14. The method of claim 13,

Further comprising a dimming controller receiving a dimming signal from outside the LED driving device and outputting to the second control circuit a dimming control signal for performing dimming control of the LED module based on the dimming signal,

Wherein the second control circuit outputs the second control signal further based on the dimming control signal.
10. The method of claim 9,

The first circuit comprising:

Further comprising a switch disposed between the calibration capacitor and the current source.
10. The method of claim 9,

Wherein one end of the current source is connected to the calibration capacitor and the other end is connected to the conversion circuit.
10. The method of claim 9,

And the energy transfer circuit is connected in parallel with the calibration capacitor.
10. The method of claim 9,

And the first circuit is connected to the LED module.
19. The method of claim 18,

Wherein at least one of the conversion circuit, the calibration capacitor, and the current source forms a closed circuit with the LED module.