WO2015080393A1 - Dispositif d'alimentation électrique et dispositif d'éclairage à led l'utilisant - Google Patents

Dispositif d'alimentation électrique et dispositif d'éclairage à led l'utilisant Download PDF

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Publication number
WO2015080393A1
WO2015080393A1 PCT/KR2014/010587 KR2014010587W WO2015080393A1 WO 2015080393 A1 WO2015080393 A1 WO 2015080393A1 KR 2014010587 W KR2014010587 W KR 2014010587W WO 2015080393 A1 WO2015080393 A1 WO 2015080393A1
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Prior art keywords
current
voltage
diode
resistor
inductor
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PCT/KR2014/010587
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English (en)
Korean (ko)
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류태하
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주식회사 디엠비테크놀로지
류태하
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Publication of WO2015080393A1 publication Critical patent/WO2015080393A1/fr

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/38—Switched mode power supply [SMPS] using boost topology
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/105—Controlling the light source in response to determined parameters
    • H05B47/14—Controlling the light source in response to determined parameters by determining electrical parameters of the light source

Definitions

  • This embodiment relates to a power supply and an LED lighting device using the same.
  • Embodiments of a general technique for a topology of a power supply circuit exist in various forms. Representatively, there are a buck type, a boost type, a buck-boost type, and a flyback type.
  • Figure 1a is a circuit diagram showing a power supply using a general buck method.
  • the input voltage V IN of a general buck type power supply may be a direct current (DC) power source, but may be used by rectifying the AC voltage (AC).
  • the main feature of a buck-type power supply is that the output load is located between the inductor (L) and the input voltage (V IN ).
  • the switch (SW) is turned on at both ends of the inductor (L)
  • the input voltage (V IN) voltage minus the output voltage (V O) from - the two applied (V IN V O) inductor current (I L) is V IN -
  • the slope of the V O voltage divided by the inductor capacitance (inductance) gradually increases, and a charge current flows through the output load current and the output capacitor.
  • the diode D When the switch is turned off, the diode D is conducted by the flow of the inductor current I L , and the output voltage V O is applied to the inductor in reverse, so that the inductor current I L converts the output voltage V O into the inductor capacity.
  • the slope divided by the value (inductance) gradually decreases, and the output current reduced due to the reduction of the inductor current I L is supplemented by being supplied from the output capacitor C.
  • the advantage of the general buck type power supply is that the output current and the inductor current (I L ) are switched to the switch (SW) on the switch (SW) under the condition of using the input voltage (V IN ) greater than the output voltage (V O ). Since the current flows, if the current flowing through the switch SW is controlled constantly, the current flowing to the output load can be kept constant even with a small output capacitor.
  • the input voltage (V IN) to the case of using by rectifying the AC voltage even when proportionally the size of the switch (SW) current to the magnitude of the rectified voltage control for the power factor (Power Factor) improvement of the input current input voltage (V IN) If the output voltage VO is smaller than this, the switch SW current cannot flow normally, resulting in a limited period in the power factor improving operation. For the above-described reason, in the case of the LED lighting apparatus using the buck-type power supply, the forward conduction voltage of the LED light emitting unit corresponding to the output voltage V O cannot be increased.
  • the number of LEDs that can be connected in series with the LED light emitting unit is limited, and when the AC voltage is rectified and used as the input voltage V IN , there is a problem in that the power factor of the input current is also not more than a limited level.
  • Figure 1b is a circuit diagram showing a power supply using a general 'boost method'.
  • the input voltage V IN of a general boost type power supply device may be a DC power source, but may be rectified and used as an AC voltage AC.
  • the main feature of the boost type power supply is that the output load is connected in parallel with the switch SW via the diode D and in series with the inductor L by the diode.
  • the switch SW When the switch SW is turned on, the input voltage V IN is applied to both ends of the inductor L so that the inductor current I L gradually increases with a slope obtained by dividing the input voltage V IN by the inductor capacitance value (inductance). Done.
  • the output load current in this section flows purely depending on the output capacitor.
  • the inductor current (I L) the diode (D) is conductive, and the inductor, the output voltage obtained by subtracting the input voltage (V IN) value in (V O) by the flow of off, (V O - V IN) is Inversely applied, the inductor current (I L ) gradually decreases as the slope of the V O -V IN voltage divided by the inductor capacitance (inductance), and the current charged in the inductor during the switch (SW) on period is passed through the diode. It will charge the output capacitor.
  • Advantages of the general boost type power supply are applicable under the condition of using an output voltage (V O ) larger than the input voltage (V IN ), and using the reference potential of the output voltage (V O ) and the ground potential of the driving unit in common. Therefore, output voltage control and output current control can be easily and accurately implemented.
  • the boost type power supply device when the output voltage V O is lower than the input voltage V IN , the inductor current I L cannot flow normally, so the output voltage V O is greater than the input voltage V IN . Can not be set smaller. Therefore, when the AC voltage is rectified and used as the input voltage V IN , the output voltage V O is limited to a voltage larger than the peak value of the rectified voltage. In the section where the output voltage V O is lower than the input voltage V IN , even if the switch SW is turned off, the output voltage V IN is output in the same direction as when the switch SW is turned on at both ends of the inductor L.
  • V O voltage obtained by subtracting the voltage - because the (V iN V O) is an inductor is normally from sending the stored energy to the output.
  • V IN the input voltage
  • V O the output voltage V O is equal to the input voltage (V) even when the magnitude of the switch SW is controlled in proportion to the rectified voltage to improve the power factor of the input current. If there is a section lower than V IN ), normal operation is not possible, so a limited section occurs in the power factor improvement operation. For the above-described reason, in the case of the LED lighting apparatus using the boost type power supply, the forward conduction voltage of the LED light emitting part corresponding to the output voltage V O may not be lowered. As a result, there is a problem of limiting the available types of output capacitors to electrolytic capacitors with short lifetimes.
  • Figure 1c is a circuit diagram showing a power supply using a general buck-boost method.
  • the input voltage V IN of a typical buck-boost power supply may be a direct current power source, but may be rectified and used as an AC voltage.
  • the most characteristic feature of a typical buck-boost power supply is that only an inductor (L) is connected in series between the input voltage (V IN ) and the switch (SW), so the inductor current (I L) is independent of the magnitude of the input supply voltage. ) Can flow.
  • the output voltage V O is connected in parallel with the inductor through the diode D and is configured such that the reference potential of the output voltage V O cannot be commonly used with the ground potential of the driving unit.
  • the output load current flows purely depending on the output capacitor C.
  • the diode D is turned on by the flow of the inductor current I L , and the output voltage V O is applied reversely to both ends of the inductor L so that the inductor current I L is output.
  • the slope of the voltage V O divided by the inductor capacitance (inductance) gradually decreases, and the current charged in the inductor in the on period of the switch SW charges the output capacitor C through the diode.
  • the advantage of a typical buck-boost power supply is that no other element is located between the input voltage (V IN ) and the switch (SW), so that the output voltage (V O ) is independent of the input voltage (V IN ). Can be set. Even when the AC voltage is rectified and used as the input voltage V IN , the inductor current I L may flow normally even in the low and high periods of the rectified voltage. In addition, when the AC voltage is rectified and used as the input voltage V IN for the reason described above, when the magnitude of the switch current is controlled to be proportional to the magnitude of the rectified voltage, the power factor may be improved without a limit. .
  • Figure 1d is a circuit diagram showing a flyback type power supply using a transformer.
  • FIG. 1D is a diagram schematically illustrating a configuration of a flyback type power supply having a transformer most commonly used in an isolation type power supply. Except for using a transformer in place of the inductor in the configuration of the power supply using the buck-boost method shown in Figure 1c has the same configuration in principle.
  • the operation principle of the switch SW on / off period is the same as that of the buck-boost method. The description of operating the other switch SW on or off is omitted.
  • the advantage of the general flyback type power supply is that when the transformer is used, the magnetizing inductance of the transformer takes the place of the inductor, and the output voltage transmitted to the output load is the primary winding (P) and the secondary winding (S1). Can be adjusted by the ratio of.
  • P primary winding
  • S1 secondary winding
  • V O output voltage
  • 'N S1 number of turns of S1'
  • 'N S2 number of turns of S2 '
  • 'output voltage delivered to the winding of V S2 : S2' it means.
  • the flyback type power supply must use a device called a bulky transformer and control the output voltage through a separate secondary winding (Primary Side Regulation), so that the correct output voltage (V O ) and output load There is a problem that current control is not easy.
  • the position of the inductor is connected between the ground potential and the input voltage of the driving unit so that the reference potential of the output voltage and the grounding potential of the driving unit can be used in common to facilitate the control of the output voltage and the output current. It is an object of the present invention to provide a power supply device and an LED lighting device using the same, by supplying the inductor current stored in the inductor to the capacitor as an output voltage to freely set the output voltage irrespective of the magnitude of the input voltage.
  • a switch for receiving an input voltage (V IN ), and performs a switching based on the driving signal applied from the driver;
  • An inductor (L) for performing charging and discharging according to on or off of the switch (SW); Diode (D); And a capacitor C configured to perform charging and discharging according to the conduction of the diode D, wherein one end of the inductor L, one end of the switch SW, and one end of the capacitor C have a common ground.
  • the other end of the inductor (L) and the other end of the switch (SW) are connected to an input power source, and one end of the diode (D) is connected to a contact point of the inductor (L) and the input power source.
  • the other end of the diode (D) provides a power supply, characterized in that connected to the other end of the capacitor (C).
  • a switch for receiving the input voltage (V IN ), and performs a switching based on the driving signal applied from the driver;
  • An inductor (L) for performing charging and discharging according to on or off of the switch (SW); Diode (D); A capacitor (C) for performing charging and discharging depending on whether the diode (D) is conductive;
  • An LED light emitting unit operating with electric power discharged from the capacitor C;
  • a current source for determining a light emitting current of the LED light emitting part, wherein one end of the inductor L, one end of the switch SW, one end of the capacitor C, and one end of the current source are grounded to a common ground, The other end of the inductor L and the other end of the switch SW are connected to an input power source, one end of the diode D is connected to a contact of the inductor L and the input power source, and the diode D Is connected to the other end of the capacitor C, one end of the LED
  • the output voltage and the output current are controlled by connecting the position of the inductor between the ground potential and the input voltage of the driving unit so that the reference potential and the driving ground potential of the output voltage can be used in common.
  • the inductor current stored in the inductor is supplied to the capacitor as an output voltage, so that the output voltage can be freely set regardless of the magnitude of the input voltage.
  • the present embodiment it is possible to provide an LED lighting device using a power circuit topology. Since the light emitting current of the LED light emitting unit is directly controlled through a current source whose output current is controlled by the light emitting current adjusting unit, accurate control can be performed without error.
  • the output voltage control can also easily control the output voltage by sensing the voltage applied to one end of the current source. In addition, it is advantageous to control the brightness of various LED light emitting units.
  • the power factor of the input current may be controlled to be close to 1 by improving the power factor to control the input current to be proportional to the detected voltage using a separate rectified voltage detection circuit.
  • the output voltage is constantly controlled regardless of the instantaneous magnitude of the rectified voltage, and the luminous current can be kept constant, the flicker problem of the AC direct-connected LED lighting device does not occur.
  • the output voltage can be determined irrespective of the magnitude of the input voltage, the required output voltage of the output capacitor C can be lowered by lowering the output voltage.
  • a tantalum capacitor C having a long life of the same capacity can be replaced.
  • 1A to 1D are circuit diagrams showing a general power circuit device.
  • FIG. 2 is a circuit diagram showing a new buck-boost power supply having a non-inverting output voltage according to the present embodiment.
  • 3A and 3B are diagrams illustrating a switch on / off section operation of the power supply apparatus according to the present embodiment.
  • FIGS. 4A and 4B are views illustrating a continuous current mode and a discontinuous current mode in an on / off period of a switch of a power supply apparatus according to the present embodiment.
  • FIG 5 is a view showing the main waveform in the boundary condition of the continuous discontinuous operation mode of the inductor current (I L ) of the power supply according to the present embodiment.
  • FIG. 6A is a circuit diagram of a power supply including a zero current sensing circuit according to the present embodiment
  • FIG. 6B is a view illustrating waveforms of one end of an inductor for zero current sensing of the power supply.
  • FIG. 7A is a circuit diagram of a power supply device including a driver power supply voltage supply circuit according to the present embodiment
  • FIG. 7B is a view illustrating an inductor (L) voltage waveform of the power supply device.
  • FIG. 8 is a circuit diagram illustrating a power supply device having a function of improving reverse flow using the rectified voltage detection signal according to the present embodiment.
  • FIG. 9 is a diagram illustrating an inductor current I L waveform and an input current waveform when the power factor improving function is applied to the power supply device according to the present embodiment.
  • FIG. 10 is a circuit diagram illustrating a rectified voltage detection circuit of a power supply using the power circuit topology according to the present embodiment.
  • FIG. 11 is a circuit diagram of the LED lighting apparatus using the power circuit topology according to the present embodiment.
  • FIG. 12 is a circuit diagram illustrating a triac dimming method of an LED lighting apparatus using a power circuit topology according to the present embodiment.
  • FIG. 13 is a diagram illustrating a TRAIC Dimmer output waveform and a current source driving (on / off) signal.
  • FIG. 14 is a circuit diagram showing analog dimming of the LED lighting apparatus using the power circuit topology according to the present embodiment.
  • FIG. 15 is a circuit diagram illustrating an LED lighting apparatus having a combination of a plurality of parallel LED light emitting unit current sources, a light emitting current adjusting unit, and a minimum value determining unit using a power supply circuit topology according to the present embodiment.
  • a capacitor means a 'charge / discharge device'
  • a diode means a 'rectification device'
  • a resistance may be interpreted as a concept of collectively referred to as a 'resistive device'.
  • FIG. 2 is a circuit diagram showing a new buck-boost power supply having a non-inverting output voltage according to the present embodiment.
  • the power supply device 200 includes a switch SW, a driver 210, an inductor L, a diode D, and a capacitor C. Components included in the power supply 200 are not necessarily limited thereto.
  • the switch SW receives an input voltage V IN .
  • the switch SW performs switching based on a driving signal applied from the driving unit 210.
  • the driver 210 generates a drive signal.
  • the inductor L performs charging and discharging according to on or off of the switch SW.
  • the capacitor C performs charging and discharging depending on whether the diode D is conductive.
  • One end of the inductor L, one end of the switch SW, and one end of the capacitor C are grounded to a common ground.
  • the other end of the inductor L and the other end of the switch SW are connected to an input power source.
  • One end of the diode D is connected to the contact point of the inductor L and the input power source.
  • the other end of the diode D is connected to the other end of the capacitor C.
  • the power supply device 200 connects the inductor L between the driving unit ground potential and the low potential terminal ( ⁇ terminal) of the input voltage V IN and outputs the voltage V through the diode D. O ) is connected in parallel with the inductor (L).
  • the reference potential of the output voltage V O can be used in common with the driving unit ground potential, it is possible to easily and accurately control the output voltage V O and the output current I OUT .
  • the current stored in the inductor L is supplied to the output capacitor C so that the output voltage V O can be freely set regardless of the magnitude of the input voltage V IN .
  • the inductor current I L does not flow normally under the condition that the input voltage V IN of the buck type power supply is lower than the output voltage V O with the same number of basic elements.
  • the output voltage and output current (I OUT ) can be controlled by limiting the use of low output voltage in the over-boost power supply and the common potential of the conventional buck-boost output voltage and the ground potential of the driver. You can solve the disadvantages that are difficult to do at the same time.
  • there is an advantage that can easily and accurately control the output voltage (V O ) and output current (I OUT ) without using a large volume and expensive flyback, such as a flyback power supply.
  • 3A and 3B are diagrams illustrating a switch on / off section operation of the power supply apparatus according to the present embodiment.
  • the inductor current I L flowing through the inductor L is increased by the input voltage V IN , thereby increasing the inductor ( L) is charged with the inductor current I L.
  • the switch SW is turned on, the input voltage V IN is applied between both ends of the inductor L.
  • the inductor current I L gradually increases as the slope of the input voltage V IN divided by the inductor inductance value, and the sum of the output voltage V O and the input voltage V IN is applied to the diode D.
  • the diode D is turned off because it is applied in the reverse direction.
  • the inductor current I L is supplied to the output voltage V O and the capacitor C is charged.
  • the diode D is turned on by the flow of the inductor current I L. Accordingly, the output voltage V O is applied to the inductor L in the reverse direction when the switch SW is turned on so that the inductor current I L converts the output voltage V O into the inductor capacitance value (inductance).
  • the capacitor C is charged via the diode D while gradually decreasing with the divided slope.
  • FIGS. 4A and 4B are views illustrating a continuous current mode and a discontinuous current mode in an on / off period of a switch of a power supply apparatus according to the present embodiment.
  • FIG. 4A there is an operation method (continuous current mode) in which the inductor current I L maintains a value greater than or equal to '0' for the entire switching period T S.
  • FIG. 4B there is an operation mode (discontinuous current mode) in which the inductor current I L does not flow during a part of the switch-off period.
  • FIG. 5 it can be divided into an operation method (Boundary Condition Mode) to maintain the boundary conditions of the two operation methods of Figures 4a, 4b.
  • the output current (I OUT ) needs a large value, increase the inductor capacitance (inductance) or shorten the switching period (T S ) to make the inductor current (I L ) more than '0' for the entire switching period (T S ). Operate continuously with large values. In this case, it is a continuous current mode to increase the average value of the inductor current (I L) peak (Peak) the paper even if the height of the inductor current value (I L) as shown in Figure 4a advantageously.
  • the discontinuous current mode may be advantageous to prevent power loss consumed in reverse recovery that may occur when the diode D is turned off while the diode D forward current flows.
  • FIG 5 is a view showing the main waveform in the boundary condition of the continuous discontinuous operation mode of the inductor current (I L ) of the power supply according to the present embodiment (Fig. 4 and the voltage V L between both ends of the inductor (L) Reversed polarity).
  • the inductor current I L is dropped to '0' during the period in which the switch SW is turned off.
  • the switch SW is turned on at the moment when the inductor current I L becomes '0', the forward current of the diode D becomes '0'. Therefore, the period in which the inductor current I L is kept below '0' in the entire switching period while preventing power loss consumed in the reverse recovery of the diode D before the diode D transitions from the on state to the off state.
  • the peak current of the inductor current is lowered for the same output current (I OUT ), thereby reducing the conduction loss of the lead.
  • the detection signal for the point where the inductor current (I L) drops to zero in order to operate in the boundary condition of constant current mode and discontinuous current mode of the inductor current (I L) is required.
  • FIG. 6A is a circuit diagram of a power supply including a zero current sensing circuit according to the present embodiment
  • FIG. 6B is a view illustrating waveforms of one end of an inductor for zero current sensing of the power supply.
  • the power supply device 600 includes a switch SW, a driver 210, an inductor L, a diode D, a capacitor C, and a zero current detection circuit 620. It includes. Components included in the power supply 600 are not necessarily limited thereto.
  • One end of the zero current sensing circuit 620 is connected to the contact of the input power supply and the inductor L, and the other end of the zero current sensing circuit 620 is connected to the driving unit 210.
  • the zero current sensing circuit 620 may include a first resistor R 1 , a second resistor R 2 , and a first diode D 1 .
  • the first resistor R 1 and the second resistor R 2 are sequentially connected to the diode D in series.
  • One end of the first diode D 1 is connected to the contact point of the first resistor R 1 and the second resistor R 2 , and the other end of the first diode D 1 is connected to the second resistor R 2 and the common ground. Is grounded.
  • the driver 210 uses the output of the contact point of the first resistor R 1 and the second resistor R 2 as a zero current detection signal.
  • the zero current sensing circuit 620 outputs the voltage V L applied to the inductor L as the sensing voltage V 1 by the resistance distribution between the first resistor R 1 and the second resistor R 2 .
  • the sensing voltage V 1 is input to the driving unit 210 as a zero current sensing signal so that the driving unit 210 determines an on time point of the switch SW.
  • the first resistor R 1 and the second resistor R 2 are replaced with each other.
  • the zero current sensing circuit may be used to detect a moment when the voltage V L of both ends of the inductor L drops to '0', thereby detecting a point where the inductor current I L falls to '0'.
  • the inductor current I L drops to '0'
  • the current flowing through the diode D drops to '0', so the current flowing through the diode D becomes '0' and the voltage across the inductor L (V L).
  • V O the output voltage
  • the sensing voltage V 1 is a voltage obtained by resistance distribution of the voltage applied to the inductor L
  • the sensing voltage V 1 falls to '0' like the voltage V L of both ends of the inductor L.
  • the driver 210 may be input to the driver 210 using a zero current detection signal to determine a time point for turning on the switch SW.
  • the first rectifier diode (D 1 ) between the ground potential and the sense voltage (V 1 ) terminal is a zero current sense voltage input side that may occur when the voltage at the sense voltage (V 1 ) terminal drops excessively to a value below '0'. It can be used to prevent the malfunction of the.
  • FIG. 7A is a circuit diagram of a power supply device including a driver power supply voltage supply circuit according to the present embodiment
  • FIG. 7B is a view illustrating an inductor (L) voltage waveform of the power supply device.
  • the power supply apparatus 700 includes a switch SW, a driver 210, an inductor L, a diode D, a capacitor C, and a driver power voltage supply circuit 720.
  • the components included in the power supply 700 are not necessarily limited thereto.
  • One end of the driver power supply voltage supply circuit 720 is connected to a contact point between the input power supply and the inductor L, and the other end of the driver power supply voltage supply circuit 720 is connected to the driver 210.
  • the driver power supply voltage supply circuit 720 includes a first capacitor C 1 , a first diode D 1 , and a second capacitor C 2 .
  • the first capacitor C 1 is connected in series with the diode D.
  • the first diode D 1 is connected in series with the first capacitor C 1 .
  • One end of the second capacitor C 2 is connected to the other end of the first diode D 1 , and the other end of the second capacitor C 2 is grounded to a common ground.
  • the driver power supply voltage supply circuit 720 inputs the output from the contact point of the first diode D 1 and the second capacitor C 2 to the driver 210 as a power supply voltage.
  • the driver power supply voltage supply circuit 720 is separately provided while the driver 210 performs the switching using the output voltage V O charged in the inductor L when the switch SW is turned off.
  • the power supply voltage is supplied to the driver 210.
  • the power supply voltage supply circuit 720 transfers the output voltage V O in the form of a pulse charged in the inductor L to the second capacitor C 2 using the first diode D 1 .
  • the power supply device requires a power supply voltage for operating the driver.
  • a resistor of moderately large value at the input voltage (V IN ) supplies the power supply voltage required to start the drive operation. If the power supply is continuously used during the switching operation of the driving unit 210, a continuous power loss occurs using the corresponding resistor when the input voltage is a large value.
  • a pulse charged in the inductor L in the switch SW off period may separately supply the power voltage of the driving unit while the driving unit 210 performs the switching driving.
  • the circuit 720 is an inductor (L) supply voltage capacitor via the output voltage (V O) to the resistance of the first rectifier diode (D 1) of the charging pulse form (C 2 You can also pass
  • L inductor
  • D 1 the resistance of the first rectifier diode
  • FIG. 8 is a circuit diagram illustrating a power supply device having a function of improving reverse flow using the rectified voltage detection signal according to the present embodiment.
  • the power supply device 800 includes a switch SW, an inductor L, a diode D, a capacitor C, a rectifier 810, and a driver 820.
  • the components included in the power supply 800 are not necessarily limited thereto.
  • the rectifier 810 is connected to the output of the alternating voltage AC, rectifies the alternating current into a direct current, and supplies the direct current to the input voltage V IN .
  • One side of the input terminal of the rectifier 810 is connected to one end of the AC voltage AC, and the other end of the input terminal of the rectifier 810 is connected to the other end of the AC voltage AC.
  • One end of the output terminal of the rectifier 810 is connected to one end of the switch SW (eg, a current inlet end), and the other end of the output terminal of the rectifier 810 is connected to one end of the inductor L.
  • the driving unit 820 is connected to one side of the output terminal of the rectifier 810 and the contact of the inductor L, and is connected to the other end of the switch SW (eg, the current drawing terminal) and one end of the output load.
  • the driver 820 includes a rectified voltage detection circuit 830.
  • the rectified voltage detection circuit 830 receives the input voltage V IN from one side of the output terminal of the rectifying unit 810 and transfers the output to the switch SW.
  • the driver 820 generates a driving signal using the rectified voltage detection signal output from the rectified voltage detection circuit 830.
  • the driving unit 820 controls the input current to have a predetermined power factor by adjusting the on period of the switch so that the switch current I S flowing when the switch SW is turned on is proportional to the rectified voltage.
  • the rectified voltage detection circuit 830 may be added to detect the rectified voltage.
  • the power supply device 800 controls the switch SW using the rectified voltage detection circuit 830, and when the switch current flowing in the on period of the switch SW is proportional to the rectified voltage detected by the rectifier 810.
  • the input current may be controlled such that the power factor has a value close to one.
  • FIG. 9 is a diagram illustrating an inductor current I L waveform and an input current waveform when the power factor improving function is applied to the power supply device according to the present embodiment.
  • the ratio of the current flowing to the switch SW to the rectified voltage detection signal is determined by the output current I OUT of the output load, which is the same as the component of the driving unit 820 shown in FIG. 8. Is multiplied by the output signal of the error amplifier used to control the output voltage, and then the corresponding value is made as the reference value (IREF) of the current in the switch SW period.
  • FIG. 10 is a circuit diagram illustrating a rectified voltage detection circuit of a power supply using the power circuit topology according to the present embodiment.
  • the rectified voltage detection circuit 830 includes a first diode D 1 , a second diode D 2 , a first resistor R 1 , a second resistor R 2 , and a first capacitor C 1 . .
  • FIG. 10 is a circuit diagram of the rectified voltage detecting circuit 830 of FIG. 8, and thus, the switch SW, the inductor L, the diode D, the rectifying unit 810, and the capacitor C described in FIG. 8 will be described. Is omitted.
  • One end of the first diode D 1 is connected to one side of an input terminal of the rectifier 810.
  • One end of the second diode D 2 is connected to the other end of the input terminal of the rectifying unit 810.
  • the other end of the first diode D 1 is connected to the other end of the second diode D 2 .
  • the first end of the resistor (R 1) is connected to the contacts of the other end of the first diode (D 1) and the other end of the second diode (D 2), the other end of the first resistor (R 1) has a second resistance (R 2 ) is connected to one end.
  • One end of the inductor L is connected to one output terminal of the rectifier 810.
  • the other end of the inductor L is connected to the other end of the second resistor R 2 .
  • the first capacitor C 1 is connected in parallel with the second resistor R 2 .
  • the other end of the second resistor R 2 and the other end of the inductor L are grounded to the common ground.
  • the rectified voltage detection circuit 830 uses the output of the contact point of the first resistor R 1 and the second resistor R 2 as the rectified voltage detection signal.
  • the rectified voltage may be detected using the rectified voltage detecting circuit 830 configured as shown in FIG. 10.
  • the rectified voltage detecting circuit 830 includes a separate first rectifying diode D 1 , a second rectifying diode D 2 , a first resistor R 1 , and a second resistor R 2 . In addition, it may further include additional elements.
  • FIG. 11 is a circuit diagram of the LED lighting apparatus using the power circuit topology according to the present embodiment.
  • the LED lighting apparatus 1100 includes a switch SW, an inductor L, a diode D, a capacitor C, an LED light emitting unit 1110, a current source 1120, and a driver 130. do.
  • Components included in the power supply 1110 are not necessarily limited thereto.
  • the LED light emitting unit 1110 includes one or more LEDs connected in series or in parallel.
  • the LED light emitting unit 1110 operates with electric power discharged from the capacitor C.
  • the current source 1120 is connected in series to the LED light emitting unit 1110. The current source 1120 determines the light emission current of the LED light emitting unit 1110.
  • the driver 1130 receives an output voltage from the current source 1120 to generate a driving signal for controlling the switching of the switch SW.
  • the driver 1130 includes an output voltage controller 1132 and a light emission current controller 1134.
  • One end of the output voltage controller 1132 is connected to a contact of the LED light emitting unit 1110 and the current source 1120.
  • the other end of the output voltage controller 1132 is connected to the input end of the switch SW to generate a driving signal.
  • the light emission current controller 1134 controls the current of the current source 1120.
  • One end of the inductor L, one end of the switch SW, one end of the capacitor C, and one end of the current source are grounded to a common ground.
  • the other end of the inductor L and the other end of the switch SW are connected to an input power source.
  • One end of the diode D is connected to the contact point of the inductor L and the input power, and the other end of the diode D is connected to the other end of the capacitor C.
  • One end of the LED light emitting unit 1110 is connected to a contact between the diode D and the capacitor C, and the other end of the LED light emitting unit 1110 is connected to the current source 1120.
  • the LED lighting apparatus 1100 may use the reference potential of the output voltage and the ground potential of the driving unit 1130 in common. As illustrated in FIG. 11, the LED light emitting unit 1110 is used as an output load.
  • the current of the current source 1120 and the current source 1120 is connected in series with the LED light emitting unit 1110 between the LED light emitting unit 1110 and the reference potential of the output voltage to determine the light emitting current of the LED light emitting unit 1110. It can be implemented by applying to the LED lighting device 1100 having a light emitting current control unit 1130 to control the.
  • the light emitting current of the LED light emitting unit 1110 is directly controlled by the current source 1120 in which the output current I OUT is controlled by the light emitting current adjusting unit 1134.
  • the output voltage control for securing the forward conduction voltage of the LED light emitting unit 1110 may also detect and control the voltage applied to one end of the current source 1120.
  • the power factor of the input current is set to 1 by improving the power factor using the rectified voltage detection circuit 830 of FIG. 10. You can control it closely.
  • the output voltage is constantly controlled regardless of the instantaneous magnitude of the rectified voltage, and the luminous current can be kept constant. Furthermore, the flicker problem of the AC direct-attached LED lighting device 1100 does not occur.
  • the output voltage may be determined regardless of the magnitude of the input voltage. By lowering the output voltage, the required voltage of the output capacitor C may be lowered. As a result, instead of using the electrolytic capacitor C having a short lifespan as the output capacitor C, a tantalum capacitor C having a long life of the same capacity can be replaced.
  • the LED lighting device 1100 using the new buck-boost power circuit topology having a non-inverting output voltage according to the present embodiment may have many advantages that the conventional LED lighting device may not have.
  • FIG. 12 is a circuit diagram illustrating a triac dimming method of an LED lighting apparatus using a power circuit topology according to the present embodiment.
  • the power supply 1200 includes a switch SW, an inductor L, a diode D, a capacitor C, a rectifier 1210, a triac dimmer 1220, and an LED.
  • the light emitting unit 1230 includes a current source 1240 and a driver 1250. Components included in the power supply 1200 are not necessarily limited thereto.
  • the rectifier 1210 is connected to the output of the AC voltage AC, rectifies the AC current into a DC current, and supplies the DC current to the input voltage V IN .
  • One side of the input terminal of the rectifier 1210 is connected to one end of the AC voltage AC, and the other end of the input terminal of the rectifier 1210 is connected to the other end of the AC voltage AC.
  • One side of the output terminal of the rectifier 1210 is connected to one end (eg, a current inlet) of the switch SW, and the other end of the output terminal of the rectifier 1210 is connected to one end of the inductor L.
  • Triac brightness controller 1220 is connected to the output of alternating voltage AC.
  • the rectifier 1210 is connected to the triac brightness controller 1220 to rectify the alternating current to a direct current, and supplies the direct current to the input voltage V IN .
  • the other end of the input terminal of the rectifier 1210 is connected to the other end of the AC voltage AC.
  • One end of the output terminal of the rectifier 1210 is connected to the current inlet of the switch SW, and the other end of the output terminal of the rectifier 1210 is grounded to a common ground.
  • the LED light emitting unit 1230 is operated by the power discharged from the capacitor (C).
  • the current source 1240 is connected to the LED light emitting unit 1230 in series and determines the light emitting current of the LED light emitting unit 1230.
  • the driver 1250 includes an output voltage controller 1252, an adder 1254, and a light emission current controller 1256.
  • One end of the output voltage controller 1252 is connected to a contact of the LED light emitting unit 1230 and the current source 1240.
  • the other end of the output voltage controller 1252 is connected to the input end of the switch SW to generate a driving signal.
  • the light emission current controller 1256 controls the current of the current source 1240.
  • One end of the adder 1254 is connected to one input terminal of the rectifier 1210.
  • the other end of the adder 1254 is connected to the light emission current controller 1256.
  • the adder 1254 generates a summation signal obtained by adding the interval detection signal and the period spacing compensation signal when the triac brightness controller 1220 operates on.
  • the light emission current controller 1256 operates the current source 1240 only when there is a summing signal, and stops the operation of the current source 1240 for the remaining period.
  • One end of the inductor L, one end of the switch SW, one end of the capacitor C, and one end of the current source are grounded to a common ground.
  • the other end of the inductor L and the other end of the switch SW are connected to an input power source.
  • One end of the diode D is connected to the contact point of the inductor L and the input power, and the other end of the diode D is connected to the other end of the capacitor C.
  • One end of the LED light emitting unit 1210 is connected to a contact between the diode D and the capacitor C, and the other end of the LED light emitting unit 1210 is connected to the current source 1120.
  • the LED lighting device 1200 when the AC voltage AC is full-wave rectified and used as an input voltage, a section detection signal when the triac brightness controller 1220 is turned on as shown in FIG. 12. And a summation signal obtained by summing the period spacing compensation signals for the intervals between the respective periods of the rectified voltage. LED lighting brightness using the triac brightness controller 1220 in such a way that the current source 1240 is operated by the light emission current controller 1256 and the operation of the current source 1240 is stopped for the remaining sections only when there is a summing signal. TRIAC Dimming is possible.
  • the triac brightness controller 1220 is turned on by comparing a voltage waveform corresponding to a portion of the input AC voltage waveform output to the triac brightness controller 1220 with a predetermined reference voltage with respect to a rectified voltage that is full-wave rectified.
  • the section detection signal may be generated.
  • a period interval compensation signal for a period between each period of the rectified voltage may be generated by generating a period interval compensation signal maintained for a predetermined period when the period detection signal disappears.
  • the adder 1254 generates an summation signal by performing an OR on the period detection signal when the triac brightness controller 1220 described above is turned on and the period compensation signal for each period of the rectified voltage. Can be. When generated as a summation signal, the triac brightness controller 1220 is turned on for the entire period of the rectified voltage or the triac at the end and beginning of each period of the rectified voltage for the case where the triac brightness controller 1220 is not used. The section detection signal may be compensated for when the brightness controller 1220 operates on.
  • each period interval compensation signal of the rectified voltage may not be necessary. However, this generates a periodic interval compensation signal in consideration of the reference voltage that makes the circuit feasible, and generates a logic interval compensation signal and a logic sum of the period detection signal when the triac brightness controller 1220 operates on. It is preferable to operate the current source 1240 by.
  • the circuit for acquiring the section detection signal when the triac brightness controller 1220 operates on may use the rectified voltage detection circuit 830 illustrated in FIG. 10 described above.
  • FIG. 13 is a diagram illustrating a TRAIC Dimmer output waveform and a current source driving (on / off) signal.
  • the LED lighting device 1200 using the new buck-boost power circuit topology having a non-inverting output voltage according to the present embodiment has a section when the triac brightness controller 1220 is turned on as shown in FIG. 12. Dimming by the triac brightness controller 1220 in a manner that the light-emitting current control unit 1256 detects the logic sum signal of the sensing signal and the periodic interval compensation signal with respect to the rectified voltage periodic interval to turn on or off the current source 1240. Is possible.
  • the current source 1240 may not be positioned between the LED light emitting unit 1230 and the reference potential of the output voltage at the output terminal. Therefore, a simple method of stopping the operation of the switch SW in the section where the output of the triac brightness controller 1220 is not available. Even if the operation of the switch SW is stopped, the accurate triac dimming control is impossible because the LED light emitting unit 1230 is continuously turned on until the charge charged in the output capacitor C is sufficiently discharged.
  • FIG. 14 is a circuit diagram showing analog dimming of the LED lighting apparatus using the power circuit topology according to the present embodiment.
  • the light emission current controller 1256 includes a first resistor R 1 , a photo coupler, a current mirror, and a second resistor R 2 .
  • One end of the first resistor R 1 is connected to one end of the analog voltage generator.
  • the other end of the first resistor R 1 is connected to one end of the photo coupler.
  • the other end of the photo coupler is connected to one end of the current mirror.
  • the other end of the current mirror is connected to one end of the second resistor R 2 .
  • the other end of the second resistor R 2 is grounded to the common ground.
  • the current source 1240 includes an OP amplifier AMP, a switching element Q 1 , and a third resistor R 3 .
  • the + input terminal of the OP AMP is connected to the contact of the current mirror and the second resistor R 2 .
  • the switching element Q 1 includes an input terminal, a current inlet terminal, and a current outlet terminal, the input terminal is connected to an output terminal of the OP amplifier, and the current inlet terminal is connected to the LED light emitting unit 1230, and the current extraction terminal. Is connected to the third resistor R 3 .
  • the ⁇ input terminal of the OP AMP is connected to the contact point of the switching element Q 1 and the third resistor R 3 .
  • the LED lighting device 1200 using a new buck-boost power circuit topology having a non-inverting output voltage has an output current I OUT at the light emitting current controller 1256 to control the light emitting current of the LED light emitting unit 1230.
  • the LED lighting device 1200 receives an analog voltage signal generated from a separate dimming device and then outputs the current I OUT of the current source 1240 using the light emitting current controller 1256 to be proportional (or inversely proportional to) the analog voltage signal. Analog dimming is possible by adjusting).
  • the LED lighting device 1200 preferably uses an isolated signal transmission device (eg, a photo coupler) as shown in FIG. 14. .
  • the light emission current controller 1256 and the current source 1240 shown in FIG. 14 are only one embodiment of the light emission current controller 1256 and the current source 1240 for analog dimming.
  • the LED lighting device 1200 using a new buck-boost power circuit topology having a non-inverting output voltage receives a PWM input signal and adjusts the light emission current of the LED light emitting unit 1230 only when the signal is high. Since the current source 1240 is turned on (or vice versa), the brightness of the LED light emitting unit 1230 can be controlled.
  • the configuration for controlling the brightness of the LED light emitting unit 1230 using the PWM input signal is a logic sum of the interval detection signal and the periodic interval compensation signal when the triac brightness controller 1220 is turned on in the triac dimming configuration.
  • the input PWM signal may be directly used as the on / off driving signal of the current source 1240.
  • FIG. 15 is a circuit diagram illustrating an LED lighting apparatus having a combination of a plurality of parallel LED light emitting units 1510 current sources 1520, a light emitting current adjusting unit, and a minimum value determining unit using a power circuit topology according to the present embodiment.
  • the LED lighting apparatus 1500 includes a switch SW, an inductor L, a diode D, a capacitor C, an LED light emitter 1510, a current source 1520, and a driver 1530. do. Components included in the LED lighting device 1500 are not necessarily limited thereto.
  • the LED light emitting unit 1510 includes a plurality of light emitting diode arrays 1512, 1514, and 1546.
  • the current source 1520 is connected in series to each of the LED arrays 1512, 1514, and 1546.
  • the driver 1530 includes an output voltage controller 1534, a minimum value determiner 1536, and an emission current controller 1538.
  • the light emission current controller 1538 controls the current of the current source 1520.
  • One end of the minimum value determiner 1536 is connected to a contact point of the LED light emitter 1510 and the current source 1520.
  • the other end of the minimum value determiner 1536 is connected to one end of the output voltage controller 1534.
  • the minimum value determiner 1536 may determine a minimum value of the voltage of the current source 1520 so that the output voltage V 0 charged in the inductor L may be equal to or higher than the forward conduction voltage of each of the LED arrays 1512, 1514, and 1546. In order to control the output voltage (V O ) to be input to the output voltage control unit 1534.
  • the output voltage controller 1534 receives the minimum value of the voltages (eg, V 1 to V N ) of the current source 1520 from the minimum value determiner 1536, and controls the switching of the switch SW based on the received minimum value. To generate a driving signal.
  • One end of the inductor L, one end of the switch SW, one end of the capacitor C, and one end of the current source are grounded to a common ground.
  • the other end of the inductor L and the other end of the switch SW are connected to an input power source.
  • One end of the diode D is connected to the contact point of the inductor L and the input power, and the other end of the diode D is connected to the other end of the capacitor C.
  • One end of the LED light emitting unit 1510 is connected to the contact of the diode D and the capacitor C, and the other end of the LED light emitting unit 1510 is connected to the current source 1520.
  • the LED lighting device 1500 using a new buck-boost power circuit topology having a non-inverting output voltage is connected in series to the LED light emitting unit 1510 and each LED light emitting unit 1510.
  • a plurality of combinations of current sources 1520, which are individually controlled by the light emitting current controller 1538, may be provided.
  • Each LED light emitting unit 1510 and the current source 1520 may be connected in parallel, and the output voltage may be equal to or higher than the forward conduction voltage of all of the LED light emitting units 1510.
  • the lowest value determining unit (Loser Takes All) may be provided such that a lowest value among voltages applied to one end of the plurality of current sources 1520 connected in parallel is transferred to the input of the output voltage controller 1534 for controlling the output voltage.
  • the LED lighting device 1500 may be implemented as an LED lighting device 1500 having an LED light emitting unit 1510 in which a plurality of light emitting currents are adjusted.
  • each LED light emitting unit 1510 uses different colors (eg, three primary colors red, green, and blue), respectively. LED lighting of various colors is possible according to the ratio of the light emission current flowing through the 1510. At this time, in consideration of the difference in the forward conduction voltage of the LED light emitting unit 1510 having different colors, the number of LEDs connected in series for each color may be different so as to have a similar forward conduction voltage as a whole.
  • colors eg, three primary colors red, green, and blue

Landscapes

  • Dc-Dc Converters (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

L'invention concerne un dispositif d'alimentation électrique et un dispositif d'éclairage à LED l'utilisant. La présente invention concerne un dispositif d'alimentation électrique et un dispositif d'éclairage à LED l'utilisant, où un inducteur est connecté à une position entre le potentiel de terre et la tension d'entrée d'une unité d'entraînement pour permettre l'utilisation commune du potentiel de référence de la tension de sortie et du potentiel de terre de l'unité d'entraînement, facilitant ainsi la régulation d'une tension de sortie et du courant de sortie, et une diode est prévue à l'intérieur et est utilisée pour fournir un courant d'inducteur stocké dans l'inducteur en tant que tension de sortie vers le condensateur pour permettre le libre réglage de la tension de sortie quelle que soit l'intensité de la tension d'entrée.
PCT/KR2014/010587 2013-11-26 2014-11-05 Dispositif d'alimentation électrique et dispositif d'éclairage à led l'utilisant WO2015080393A1 (fr)

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KR101678947B1 (ko) * 2015-07-23 2016-11-23 (주)성진아이엘 2채널 led 광원 구동 장치
KR20170071229A (ko) 2015-12-15 2017-06-23 엘지이노텍 주식회사 조광기와 드라이버가 전기적 절연 구조를 가지는 조명 장치 및 시스템
KR102460625B1 (ko) * 2022-04-15 2022-10-28 주식회사 웰랑 플리커-프리를 위한 장치 및 이를 포함하는 조명 기기
KR102460626B1 (ko) * 2022-04-28 2022-10-28 주식회사 웰랑 플리커-프리를 위한 장치 및 이를 포함하는 조명 기기

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JPH0767326A (ja) * 1993-08-26 1995-03-10 Matsushita Electric Works Ltd 電源装置
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