WO2017188757A2 - Appareil d'éclairage à diodes électroluminescentes du type à gradation possédant un dispositif d'alimentation électrique sans condensateur électrolytique - Google Patents

Appareil d'éclairage à diodes électroluminescentes du type à gradation possédant un dispositif d'alimentation électrique sans condensateur électrolytique Download PDF

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WO2017188757A2
WO2017188757A2 PCT/KR2017/004501 KR2017004501W WO2017188757A2 WO 2017188757 A2 WO2017188757 A2 WO 2017188757A2 KR 2017004501 W KR2017004501 W KR 2017004501W WO 2017188757 A2 WO2017188757 A2 WO 2017188757A2
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voltage
current
led lighting
unit
power supply
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PCT/KR2017/004501
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English (en)
Korean (ko)
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WO2017188757A3 (fr
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유원동
서완용
이승희
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주식회사 엘이디파워
주식회사 엘아이티씨
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Priority claimed from KR1020160052862A external-priority patent/KR101651508B1/ko
Priority claimed from KR1020160052859A external-priority patent/KR101651506B1/ko
Application filed by 주식회사 엘이디파워, 주식회사 엘아이티씨 filed Critical 주식회사 엘이디파워
Publication of WO2017188757A2 publication Critical patent/WO2017188757A2/fr
Publication of WO2017188757A3 publication Critical patent/WO2017188757A3/fr

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  • the present invention relates to an LED lighting device, and more particularly to a dimming type LED lighting device having an electrolytic capacitorless power supply to improve the life by eliminating the electrolytic capacitor.
  • AC power supplies include Switching Mode Power Supply (SMPS) and Linear Power Supply, which are used in most fields such as home appliances, computers, and communication devices.
  • SMPS Switching Mode Power Supply
  • Linear Power Supply which are used in most fields such as home appliances, computers, and communication devices.
  • SMPS method is mainly used.
  • LED lighting using SMPS devices is also widely developed.
  • These LEDs have a low driving voltage (Vf) to increase the driving current (If) to make a high output lighting device, and also because the lighting equipment is a good light when the flicker (low flicker) is used, a capacitor having a large capacity at the output stage is used. shall.
  • the lifetime of the LED is about 35,000 hours due to the above-mentioned heat generation, while the lifetime of the SMPS is often less than 20,000 hours, according to a 2012 report by the US Department of Energy (DOE).
  • DOE US Department of Energy
  • FIG. 1 is a circuit diagram showing a general boost SMPS. As shown in the drawing, a full-wave bridge rectifier 10, an inductor L11, a switch SW11, a diode D11, and an electrolytic capacitor C11).
  • the output voltage thus produced is output and supplied to the load 1, which is rectified by the diode D11 to filter only the current of the required component, and then smoothed through the electrolytic capacitor C11 and then output.
  • the switch SW11 is periodically turned on and off to generate a pulsed DC voltage and supply it to the load 1.
  • FIG. 2 is a circuit diagram illustrating a typical buck type SMPS. As shown in the figure, a full-wave bridge rectifier 20, a switch SW21, a diode D21, an inductor L21, and a diode D22 are shown in FIG. , And an electrolytic capacitor C21.
  • the diode D21 forms a passage so that the inductor current which is energy accumulated in the inductor L21 is rectified in the diode D22 and flows through the electrolytic capacitor C21 and the load 1, Inductor current decreases until switch SW21 is turned on again.
  • the switch SW21 is periodically turned on / off to generate a pulsed DC voltage and supply it to the load 1.
  • electrolytic capacitors C11 and C21 are used to store power passing through the inductor by switching, and the electrolytic capacitors C11 and C21 are applied at an external temperature.
  • the six life conditions such as voltage, ripple current, charge / discharge pattern, inrush current, abnormal voltage, etc., may shorten the life and cause failure.
  • the conventional SMPS checks the output voltage and adjusts the on / off switching of the switches SW11 and SW21 according to the check result to constantly adjust the output voltage. give.
  • the driving voltage Vf drops by about 2 mV to 5 mV, and thus the applied voltage is increased by that much, thereby increasing the current flowing in the LED load 1.
  • the applied voltage increases by about 10%, the current flowing in the LED load 1 increases by 50 to 100%.
  • the internal temperature rises to about 85 degrees, which is more than 60 degrees Celsius at room temperature, which causes thermal runaway and consumes more current than the electrolytic capacitors (C11, C21).
  • the ripple current in the circuit also occurs above the allowable value, which causes a failure of the electrolytic capacitors C11 and C21.
  • the present invention is to solve the above-described problems, the secondary side electrolytic capacitor required for the stabilization of the output voltage, current, because the sensing of the primary side input voltage information of the transformer and sensing the input current to drive based on the input power It is an object of the present invention to provide a dimmable LED lighting device having an electrolytic capacitorless power supply to improve the overall lifespan by eliminating the problem.
  • Dimming type LED lighting device having an electrolytic capacitorless power supply for achieving the above object is a dimming type LED lighting device having an electrolytic capacitorless power supply for supplying power to the LED lamp, A voltage input unit for inputting a commercial AC voltage, a transformer having a primary side connected to the voltage input unit and a secondary side connected to the LED lamp to drive an LED lamp, a power transistor connected between the primary side of the transformer and a ground terminal; A noise filter configured to remove noise included in a power source inputted to the LED lamp by the transformer and the LED lamp, and a reference voltage generator to generate and output a commercial AC voltage input through the voltage input unit as a reference voltage And receiving the reference voltage generated by the reference voltage generator as an input. It is configured in the switching controller and an output terminal of the LED lamp for driving the transistor is characterized in that the configuration comprises a ripple cancellation to remove the AC ripple current.
  • Dimming type LED lighting device having an electrolytic capacitorless power supply according to an embodiment of the present invention has the following effects.
  • the input current is sensed and driven based on the input power, thereby eliminating the secondary electrolytic capacitor required for stabilizing the output voltage and current, thereby improving the overall lifetime.
  • the luminous flux of the LED light can be maintained continuously.
  • the ripple removal device is additionally configured at the output terminal of the LED lamp to effectively remove the AC ripple current, thereby preventing the flicker of the LED lamp in advance.
  • FIG. 1 is a circuit diagram showing a general boost SMPS
  • FIG. 2 is a circuit diagram showing a typical buck type SMPS
  • FIG. 3 is a schematic view showing a dimming type LED lighting device having an electrolytic capacitorless power supply according to a first embodiment of the present invention
  • Figure 4 is a schematic view showing a dimming type LED lighting apparatus having an electrolytic capacitorless power supply according to a second embodiment of the present invention
  • FIG. 5 is a schematic diagram illustrating a reference voltage generator of FIG. 3;
  • FIG. 6 is a graph illustrating a change of a reference voltage with respect to an input voltage in the reference voltage generator of FIG. 5.
  • FIG. 7 is a diagram for describing a relationship between an input voltage and a reference voltage in the reference voltage generator of FIG. 5.
  • FIG. 7 is a diagram for describing a relationship between an input voltage and a reference voltage in the reference voltage generator of FIG. 5.
  • FIG. 8 is a configuration diagram schematically illustrating the switching controller of FIG. 3.
  • FIG. 9 is a graph illustrating a waveform of a reference voltage generated by the reference voltage generator of FIG. 3 and a driving waveform input to a gate of a power transistor;
  • FIG. 10 is a switching block diagram of the power transistor shown in FIG. 4.
  • FIG. 11 is a schematic view illustrating the ripple removing unit of FIG. 4.
  • FIG. 11 is a schematic view illustrating the ripple removing unit of FIG. 4.
  • FIG. 12 is a circuit diagram illustrating the ripple removing unit of FIG. 11 in more detail.
  • FIG. 3 is a schematic view showing a dimming type LED lighting apparatus having an electrolytic capacitorless power supply according to a first embodiment of the present invention.
  • a reference voltage generator 140 for generating and outputting a commercial AC voltage input through the transistor 130, the voltage inputter 110 as a reference voltage, and a reference voltage generated by the reference voltage generator 140.
  • a switching control unit 150 which receives the input and drives the power transistor 130, and is disposed between the transformer 120 and the LED lamp 100 to remove noise included in the power input to the LED lamp 100. Noise fill And a current sensing unit 170 which senses a current value input to the primary side of the transformer 120 and outputs it to the switching controller 150.
  • the switching controller 150 receives the reference voltage from the reference voltage generator 140 and drives the power transistor 130 according to the current value sensed by the current sensing unit 170.
  • the voltage input unit 110, the power transistor 130, the reference voltage generator 140, and the switching controller 150 are connected to a primary side of the transformer 120, and a noise filter is connected to a secondary side of the transformer 120.
  • the 160 and the LED lamp 100 are connected in parallel.
  • the noise filter 160 is made of a ceramic capacitor.
  • the voltage input unit 110 is connected to a rectifier 111 for rectifying and outputting an AC voltage, a voltage divider 112 for distributing an AC voltage rectified by the rectifier 111, and the transformer 120. It comprises a transient voltage suppression unit 113 for suppressing the transient voltage generated when the transformer 120 is turned on / off.
  • the voltage divider 112 is configured by connecting a plurality of resistors in series, and outputs the reinforced voltage of the rectifier 111.
  • the rectifier 111 rectifies a commercial AC voltage, for example, 110 or 220 volts input to the LED lamp 100 into a DC voltage VIN.
  • the rectifier 111 may include various rectifiers, and in the exemplary embodiment of the present invention, a bridge rectifier is used.
  • the voltage divider 112 is connected to the rectifier 111.
  • the voltage divider 112 distributes the DC voltage VIN output from the rectifier 111 to various voltage levels. That is, the voltage divider 112 outputs the DC voltage VIN output from the rectifier 111 to a lower voltage.
  • the voltage divider 112 is formed by connecting two series connected resistors R1 and R2 in series.
  • the two series connected resistors R1 and R2 are connected to an output terminal and a ground terminal GND of the rectifier 111. Is connected between.
  • the output voltage VSEN of the voltage divider 112, that is, the voltage lowered than the output voltage VIN of the rectifier 111 is output between the two resistors R1 and R2.
  • the output voltage VSEN of the voltage divider 114 is transmitted to the reference voltage generator 140. As the number of resistors constituting the voltage divider 114 increases, the number of output voltages VSEN of the voltage divider 112 increases. Thus, the voltage divider 112 can output various levels of voltages.
  • the transient voltage suppressor 113 is connected between the transformer 120 and the voltage divider 112 to suppress the transient voltage generated when the transformer 120 is turned on / off.
  • the transient voltage suppressor 113 includes a resistor R3, a capacitor C1, and a diode D1.
  • the resistor R3 and the capacitor C1 are connected in parallel with each other, and one end thereof is connected to the rectifier 111 and the primary side of the transformer 120.
  • the diode D1 is connected in series with the resistor R3 and the capacitor C1. That is, the anode electrode of the diode D1 is connected to the primary side of the transformer 120, and the cathode electrode of the diode D1 is connected to the resistor R3 and the capacitor C1. Therefore, when a transient voltage is generated from the transformer 120, it is transmitted to the resistor R3 through the diode D1 and removed.
  • the primary side of the transformer 120 is connected to the voltage input unit 110, the LED lamp 100 is connected to the secondary side of the transformer 120.
  • the transformer 120 transfers it to the secondary side to drive the LED lamp 100.
  • a power transistor 130 is connected to the primary side of the transformer 120, and the on / off of the transformer 120 is determined by the power transistor 130.
  • the power transistor 130 is connected between the primary side of the transformer 120 and the ground terminal GND.
  • the power transistor 130 is composed of a power NMOS metal field semiconductor transistor (FET).
  • FET power NMOS metal field semiconductor transistor
  • a drain of the power NMOS FET is connected to the primary side of the transformer 120, a source of the power NMOS FET is connected to a ground terminal GND, and a gate of the power NMOS FET is connected to a switching controller 150.
  • the power transistor 130 when the signal OUT output from the switching controller 150 is higher than the threshold voltage of the power transistor 130, the power transistor 130 is turned on, thereby turning the transformer 120 into an activated state, that is, on. ) If the signal OUT output from the switching controller 150 is lower than the threshold voltage of the power transistor 130, the power transistor 130 is turned off, whereby the transformer 120 is in an inactive state. , Off. As such, the power transistor 301 controls the operation of the transformer 120.
  • the brightness of the LED lamp 100 can be appropriately controlled by appropriately adjusting the ON time and the OFF time of the power transistor 130.
  • the current sensing unit 170 is connected between the power transistor 130 and the ground terminal GND, and the current sensing unit 170 may be formed of a resistor. That is, the current output from the power transistor 130 flows to the ground terminal GND through the current sensing unit 170. Therefore, the output current of the power transistor 130 may be determined by sensing the current flowing to the current sensing unit 170.
  • a diode (D2) is configured to remove the AC component on the secondary side of the transformer 120, the diode (D2) is output from the secondary side of the transformer 120 is applied to the LED lamp 100 Remove the AC component included in the DC signal.
  • the diode D2 passes a DC current output from the secondary side of the transformer 120, and the noise filter 160 absorbs and removes an AC signal included in the DC current passing through the diode D2. .
  • the reference voltage generator 140 is connected to the voltage inputter 110 and the switching controller 150.
  • the reference voltage generator 140 receives a DC voltage VSEN output from the voltage inputter 110 as an input and detects a variation level of the DC voltage VSEN to generate a reference voltage.
  • the switching controller 150 is connected to the reference voltage generator 140 and the power transistor 130.
  • the switching controller 150 receives the output of the reference voltage generator 140 to drive the power transistor 130.
  • the output terminal of the switching controller 150 is connected to the gate of the power transistor 130.
  • the operation of the power transistor 130 is controlled according to the magnitude of the output signal OUT of the switching controller 150. That is, when the output signal of the reference voltage generator 140 is large, the switching controller 150 turns on the power transistor 130 long, and when the output signal of the reference voltage generator 140 is small. The power transistor 130 is briefly turned on.
  • FIG. 4 is a schematic view showing a dimming type LED lighting apparatus having an electrolytic capacitorless power supply according to a second embodiment of the present invention.
  • Dimming type LED lighting apparatus having an electrolytic capacitorless power supply according to a second embodiment of the present invention is AC ripple at the output terminal of the LED lamp 100 as compared to the first embodiment, as shown in FIG. Except for configuring the ripple removing unit 180 to remove the current has the same configuration.
  • FIG. 5 is a configuration diagram schematically illustrating a reference voltage generator of FIG. 3.
  • the reference voltage generator 140 may detect a peak voltage included in an output voltage VSEN of the voltage divider 112 constituting the voltage input unit 110. 141, a differential amplifier 142 for generating a reference voltage in response to the output signal of the peak voltage detector 141, and a propagation current for generating a propagation current in response to the output voltage of the voltage divider 112. And a first current mirror unit 144 connected to the generation unit 143 and the output terminal of the propagation current generation unit 143 to transfer the propagation current.
  • the peak voltage detector 141 is connected to the voltage divider 112.
  • the peak voltage detector 141 detects the peak voltage and the lowest voltage of the DC voltage VSEN output from the voltage divider 112.
  • the DC voltage VSEN output from the voltage divider 112 is changed when the voltage input to the voltage input unit 110 changes.
  • the DC voltage VSEN is also varied by the amount of change in the voltage input to the voltage input unit 110.
  • the peak voltage detector 141 detects the highest value of the DC voltage VSEN, that is, the peak voltage and the lowest value of the DC voltage, that is, the lowest voltage.
  • the differential amplifier 142 outputs a reference voltage in response to the signal output from the peak voltage detector 141. That is, when the peak voltage is output from the peak voltage detector 141, the differential amplifier 142 decreases the output signal OUT of the reference voltage, and when the lowest voltage is output from the peak voltage detector 141. The output signal OUT of the reference voltage is increased and output.
  • the differential amplifier 142 may include a first NMOS transistor NM1 to which an output signal V1 of the peak voltage detector 141 is applied to a gate and a second NMOS transistor NM2 to which a reference voltage V2 is applied to a gate. ) And a differential unit 145 having resistors Ra1 and Ra2, and a first PMOS transistor PM1 connected to the drain of the first NMOS transistor NM1, and a drain of the second NMOS transistor NM2.
  • a second current mirror unit 146 a voltage current converter NM3 connected to the differential unit 145 to convert a voltage output from the differential unit 145 into a current, and the second current mirror unit 146 And a current voltage converter Ra3 for converting the current output from the voltage into a voltage and outputting the current as an output signal OUT of the reference voltage generator 140.
  • the first and second current mirror parts 144 and 146 include two PMOS transistors PM2 and PM3.
  • the operation of the differential amplifier 142 will be described.
  • the first NMOS transistor NM1 flows more current than the second NMOS transistor NM2.
  • the output current of the second current mirror 146 is reduced, and accordingly the voltage level of the output signal OUT of the differential amplifier 142 is reduced.
  • the second NMOS transistor NM2 flows more current than the first NMOS transistor NM1. Then, the output current of the second current mirror 146 increases, and accordingly the voltage level of the output signal OUT of the differential amplifier 142 increases.
  • the peak voltage detector 141 may adjust the peak voltage.
  • the output signal OUT of the differential amplifier 142 that is, the voltage of the output signal OUT of the reference voltage generator 140 is reduced accordingly.
  • the peak voltage detection unit 141 is the lowest voltage.
  • the output signal OUT of the differential amplifier 142 that is, the voltage level of the output signal OUT of the reference voltage generator 140 increases accordingly.
  • FIG. 6 is a graph illustrating a change of a reference voltage with respect to an input voltage in the reference voltage generator of FIG. 5
  • FIG. 7 is a diagram for describing a relationship between an input voltage and a reference voltage in the reference voltage generator of FIG. 5.
  • the value for determining I3 of the voltage current converter NM3 follows the value of the propagation current generated by the propagation current generator 143. As shown in FIG. 6, when the 110AC input, I1 becomes smaller and Ia becomes larger. At 220VAC input, I1 becomes larger and Ia becomes smaller. This value changes the waveform value of the reference voltage Vref (Vin vs. Vb are inversely measured) (Fig. 7).
  • Va changes Vref due to a change in input voltage.
  • the present invention is to keep the power consumption constant by changing Vref in inverse proportion to the change of Va (input voltage Vin full-wave rectified waveform).
  • FIG. 8 is a configuration diagram schematically illustrating the switching controller of FIG. 3.
  • the switching controller 150 compares the reference voltage generated by the reference voltage generator 140 with the primary side current value of the transformer 120 measured by the current sensing unit 170. 151 and the SR latch unit 152 that operates in response to the signal compared in the comparison unit 151.
  • the RS latch unit 152 resets the output signal when the output signal of the comparator 151 is at a power supply voltage level, and the output signal of the comparator 151 is grounded. At the voltage GND level, the RS latch unit 152 is set to output a signal.
  • the current applied to the LED lamp 100 may be constantly maintained even without a device for feeding back a voltage or current from the secondary side to the primary side of the transformer 120.
  • the present invention does not use a feedback device, the configuration is simple, and thus the manufacturing cost is reduced.
  • FIG. 9 is a graph illustrating a waveform of a reference voltage generated by the reference voltage generator of FIG. 3 and a driving waveform input to a gate of a power transistor.
  • the waveform of the reference voltage input to the switching controller 150 and the on / off waveform of the power transistor 130 are maintained in the same waveform to maintain the power consumption while maintaining the phase difference of the voltage and current waveform. Can be matched to form a current square wave.
  • a high power factor and a low THD may be realized while maintaining a constant power consumption of the LED lamp 100.
  • the power factor means a cos difference of phase time in the flow of the waveform of the voltage and the current of the AC power source
  • the THD is a component of the frequency component that is an integer multiple of the fundamental wave (60 Hz) of the commercial power source.
  • the current of the total harmonic components with respect to the fundamental current is called the current harmonic content.
  • FIG. 10 is a switching block diagram of the power transistor shown in FIG. 3.
  • the FET current slope is determined by the reference voltage Vref when the power transistor 130 is switched on, and the FET switching frequency is fixed by the fixed off time when the power transistor 130 is switched off. That is, duty is fixed.
  • Vf of the LED load decreases over time, so that the initial luminous flux of the LED light is not maintained. Even though Vf is decreased, the output current is increased to maintain the initial luminous flux of the LED light.
  • Ton is the switching on time of the power transistor
  • Toff is the switching off time
  • Ip is the primary switch current and is determined by the sensing resistance value Ra.
  • Toff is constant and Vo can be controlled by adjusting the Ton time.
  • the power consumption is calculated as shown in Equation 11 below.
  • Pin represents power consumption
  • Vout represents an output voltage
  • Iout represents an output current.
  • PSR & SSR method power consumption is determined according to the variation of Vout and the fixed value of Iout.
  • Iout is changed according to Vout variation based on power consumption (fixed), and conversely, power consumption is followed.
  • FIG. 11 is a schematic view illustrating the ripple removing unit of FIG. 4, and FIG. 12 is a circuit diagram illustrating the ripple removing unit of FIG. 11 in more detail.
  • the ripple removing unit 180 is configured at an output end of the LED lamp 100 and detects an AC ripple current coming from the output of the LED lamp 100, and the The clamping unit 50 is configured between the LED lamp 100 and the ripple detector 40 to clamp the AC ripple current so that the AC ripple current is removed, and the AC ripple current is removed from the clamping unit 50. It includes an AC ripple current control unit 60 for controlling the clamping unit 50, and the AC ripple removing unit 70 is configured between the output terminal and the ground of the LED lamp 100 to remove the AC ripple current.
  • the ripple detector 40 is made of a resistor that one side is connected to the ground terminal and the other side is connected to the clapping unit 50, the ripple detector 40 is the output terminal and the ground of the LED lamp 100 It is connected in series with the clamping portion 50 between.
  • the clamping unit 50 is formed of an FET device between the output of the LED lamp 100 and the ripple detector 40, and the control signal of the AC ripple current controller 60 is applied to a gate of the ripple detector.
  • the voltage applied to 40 is configured to follow the external reference VCC voltage.
  • the AC ripple removing unit 70 is connected in parallel with the connection of the ripple detector 40 and the clamping unit 50 based on the cathode of the LED lamp 100. Therefore, the AC ripple removing unit 70 may remove the AC ripple component more effectively by increasing the time constant of the capacitor.
  • the ripple detector 40 is configured at an output terminal of the LED lamp 100 and detects an AC ripple current from the output of the LED lamp 100, and the LED lamp 100 and the ripple.
  • the clamping unit 50 is configured between the sensing unit 40 to clamp the AC ripple current so that the AC ripple current is removed, and the clamping unit 50 is controlled to remove the AC ripple current from the clamping unit 50.
  • an AC ripple current control unit 60 and an AC ripple removing unit 70 configured between the output terminal of the light emitting diode 30 and the ground to remove the AC ripple current.
  • the AC ripple current controller 60 is connected between the clamping unit 50 and the ripple sensing unit 40 and is actively driven by receiving the reference voltage VCC from the reference voltage source 61.
  • the ripple component can be removed by passing through the filter 65.
  • the AC ripple current controller 60 applies a control signal to the clamping unit 50 to clamp the AC ripple current, and the voltage of the ripple detecting unit 40 connected to the clamping unit 50 is the capacitor filter. It is connected so as to follow the voltage applied to (65).
  • the AC ripple current controller 60 includes a reference voltage source 61, first through fourth resistors 62a, 62b, 62c, and 62d, first and second switching elements 63a and 63b, and first and second operations.
  • Amplifiers 64a, 64b, and capacitor filters 65 respectively.
  • the current passing through the LED lamp 100 passes through the first resistor 62a and the second resistor 62b through the clamping unit 50 and the first and second operational amplifiers 64a and 64b. Applied to each negative terminal.
  • the control electrode of the first switching element 63a is connected to the output of the second operational amplifier 64b, and the control electrode of the second switching element 63b is connected to the output of the first operational amplifier 64a. Connected.
  • the first operational amplifier 64a receives the signal of the reference voltage source 61 located at the outside as a positive terminal and is coupled in the form of a follower, the output is always the reference voltage source.
  • a signal of 161 is followed, and a reference signal is applied to the control electrode of the second switching element 63b so that the second switching element 64b is turned on.
  • the reference voltage of the reference voltage source 61 is always applied to the drain electrode of the first switching element 63a, and the reference voltage is applied to the negative terminal of the second operational amplifier 64b.
  • the output voltage of the clamping unit 50 is applied to the (+) terminal of the second operational amplifier 164b while passing through the second resistor 62b.
  • the second operational amplifier 64b outputs a positive output signal + VCC when the output voltage of the clamping unit 50 is greater than the reference voltage, so that the clamping unit 50 is turned on. do.
  • the DC current component passing through the LED lamp 100 flows through the clamping unit 50 and the ripple detector 40, in which case the output voltage of the clamping unit 50 is the capacitor filter ( Following the voltage of 65) can reduce power consumption.
  • the first switching element 63a connected together to the output of the second operational amplifier 64b is also turned on together. Therefore, since the DC current applied through the first resistor 62a is connected to the ground through the third resistor 62c and the second switching element 63b, the light emitting diode 30 may receive a DC current. .
  • a fourth resistor 62d is connected between the contact point between the third resistor 62c and the drain electrode of the second switching element 63b and the ground. Therefore, even when the second switching element 63b is turned off, the DC current flows through the fourth resistor 62d so that the DC current can always stably flow.
  • the capacitor filter 65 is connected between the contact between the source electrode of the second switching element 63b and the third resistor 62c and the ground.
  • the ripple removing unit 180 shorts the fourth resistor 62d and the upper limit value of the AC ripple current is determined by the third resistor 62c.
  • the lower limit value is determined by the third and fourth resistors 62c and 62d to control the AC ripple current similarly to the DC current source. Small power consumption can be achieved by reducing the loss of the clamping unit 50 through the fast ripple detection of the ripple detector 40.
  • the ripple removing unit 180 may effectively remove the ripple component by configuring the current passing through the LED lamp 100 to pass through the AC ripple removing unit 70.
  • power consumption may be minimized by configuring the output voltage of the clamping unit 50 connected to the LED lamp 100 to follow the reference voltage.
  • the capacitor filter 65 removes the ripple component, which is an AC component included in the current.
  • the capacitor filter 65 is coupled to the drain of the first switching element 63a to receive the reference voltage of the reference voltage source 61 to maintain the same voltage.
  • the AC ripple removing unit 70 is also connected in parallel with the capacitor filter 65, thereby increasing the overall capacitor capacity. For this reason, the ripple removal apparatus of the LED lamp according to the present invention may increase the time constant of the capacitor to enable more effective ripple component removal.
  • the first operational amplifier 64a drives the clamping unit 50 so that the AC ripple current approaches the VCC voltage of the reference voltage source 61 that is applied to the first operational amplifier 64a.
  • the first operational amplifier 64a drives the clamping unit 50 so that the AC ripple current approaches the VCC voltage of the reference voltage source 61 that is applied to the first operational amplifier 64a.
  • This operation produces very close DC LED currents with minimal power consumption. That is, by effectively removing only the AC ripple from the power supply of the LED lamp 100, it is possible to prevent the flicker phenomenon in advance.
  • the present invention senses and controls the primary side input voltage information of the transformer and senses the input current to drive based on the input power, the overall lifetime can be improved by removing the secondary side electrolytic capacitor required for stabilizing the output voltage and current. Therefore, there is a possibility of industrial use.

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Abstract

La présente invention concerne un appareil d'éclairage à DEL du type à gradation possédant un dispositif d'alimentation électrique sans condensateur électrolytique qui détecte et commande des informations de tension d'entrée d'un côté primaire d'un transformateur, détecte un courant d'entrée de celui-ci, et fonctionne en fonction de la puissance d'entrée de celui-ci. Par conséquent, l'appareil ne nécessite pas de condensateur électrolytique côté secondaire pour stabiliser sa tension de sortie et son courant, et il peut ainsi prolongée sa durée de vie globale. L'appareil d'éclairage à DEL, qui possède un dispositif d'alimentation électrique sans condensateur électrolytique pour alimenter un élément d'éclairage à DEL, comprend : une unité d'entrée de tension pour l'entrée une tension alternative secteur ; un transformateur ayant un côté primaire connecté à l'unité d'entrée de tension et un côté secondaire connecté à l'élément d'éclairage à DEL de façon à commander l'élément d'éclairage à DEL ; un transistor de puissance connecté entre le côté primaire du transformateur et une borne de mise à la masse ; un filtre antibruit configuré entre le transformateur et l'élément d'éclairage à DEL pour éliminer le bruit inclus dans l'énergie fournie à l'élément d'éclairage à DEL ; une unité de génération de tension de référence pour générer et délivrer une tension alternative secteur d'entrée par l'intermédiaire de l'unité d'entrée de tension, en tant que tension de référence ; et une unité de commande de commutation destinée à recevoir, en tant qu'entrée, la tension de référence générée par l'unité de génération de tension de référence et commander le transistor de puissance.
PCT/KR2017/004501 2016-04-29 2017-04-27 Appareil d'éclairage à diodes électroluminescentes du type à gradation possédant un dispositif d'alimentation électrique sans condensateur électrolytique WO2017188757A2 (fr)

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CN112953220A (zh) * 2021-02-03 2021-06-11 电子科技大学 带有电流检测和控制的dc-dc转换器

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KR20120056162A (ko) * 2010-11-24 2012-06-01 삼성엘이디 주식회사 Ｌｅｄ 구동장치
JP5110197B2 (ja) * 2011-01-18 2012-12-26 サンケン電気株式会社 Ｌｅｄ駆動装置及びｌｅｄ照明装置
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KR20130072526A (ko) * 2011-12-22 2013-07-02 삼성전기주식회사 역률 개선 회로의 오동작 방지 회로
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KR101292219B1 (ko) * 2013-05-27 2013-08-02 주식회사엘이디파워 리플 제거 장치를 구비한 led 램프의 전원 공급 장치
KR20150047951A (ko) * 2013-10-25 2015-05-06 주식회사 파이컨 Led 전원 공급 장치 및 이를 사용하는 led 조명 기구
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Publication number Priority date Publication date Assignee Title
CN112953220A (zh) * 2021-02-03 2021-06-11 电子科技大学 带有电流检测和控制的dc-dc转换器
CN112953220B (zh) * 2021-02-03 2022-12-30 电子科技大学 带有电流检测和控制的dc-dc转换器

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