WO2014014248A1 - Circuit d'alimentation électrique - Google Patents

Circuit d'alimentation électrique Download PDF

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Publication number
WO2014014248A1
WO2014014248A1 PCT/KR2013/006320 KR2013006320W WO2014014248A1 WO 2014014248 A1 WO2014014248 A1 WO 2014014248A1 KR 2013006320 W KR2013006320 W KR 2013006320W WO 2014014248 A1 WO2014014248 A1 WO 2014014248A1
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WO
WIPO (PCT)
Prior art keywords
voltage
circuit
power supply
load
supply circuit
Prior art date
Application number
PCT/KR2013/006320
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English (en)
Inventor
Min Jun Jang
Woo Jun Jang
Original Assignee
Min Jun Jang
Woo Jun Jang
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Min Jun Jang, Woo Jun Jang filed Critical Min Jun Jang
Publication of WO2014014248A1 publication Critical patent/WO2014014248A1/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
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the present invention relates to a power supply circuit and, more particularly, to a power supply circuit that makes use of a multi-level voltage output circuit capable of outputting a plurality of voltages differing in amplitude and a switching circuit.
  • a light emitting diode has advantages in terms of light efficiency and durability. For that reason, the light emitting diode is popular as a light source for a backlight of an illumination device or a display device.
  • the light emitting diode is driven by a low direct current.
  • different power supply devices for converting a commercial AC voltage (AC 220 V) to a DC voltage.
  • AC 220 V AC voltage
  • SMPS Switchched-Mode Power Supply
  • linear power supply DC voltage
  • these power supply devices are mostly low in conversion efficiency. Since an electrolytic capacitor used as one part of the power supply devices suffers from a reduced lifespan, there is a problem in that the use of these power supply devices tends to shorten the lifespan of an LED illumination device.
  • KR10-2012-0041093A discloses a method in which an AC voltage is rectified and then the number of LEDs applied with the rectified voltage is adjusted depending on the change in the magnitude of the rectified voltage. As compared with a method of directly using an alternating current, this method can increase the number of LEDs in operation. Therefore, this method can enjoy advantages of increased efficiency, shortened current supply time and improved power factor.
  • the aforementioned method in which the alternating current is rectified and the number of LEDs applied with a rectified voltage is adjusted through the use of a switch, has a problem in that the number of LEDs in operation is continuously changed in keeping with the change in the magnitude of the rectified voltage. This may generate variations in brightness depending on the position and time.
  • the LEDs Due to the properties of an alternating current, the LEDs are turned off in a region where the phase of the alternating current is about 180 degrees. Moreover, the drive frequency is fixed at 120 Hz. This poses a problem in that some users may suffer from light-caused convulsions or may have repulsion to the light.
  • Another object of the present invention is to provide a power supply circuit capable of minimizing the off-duration of LEDs through the use of a multi-level voltage output circuit, a rectifying circuit, a switch and a charge-discharge circuit.
  • a power supply circuit includes: a multi-level voltage output circuit including an input end to which a voltage having a periodically changing magnitude is inputted and a plurality of output ends from which a plurality of voltages differing in amplitude is outputted; and a switching circuit configured to select one voltage whose instantaneous value belongs to a predetermined range, from the plurality of voltages outputted from the multi-level voltage output circuit, based on a change in a voltage magnitude or a voltage phase at a front end or a rear end of the multi-level voltage output circuit, and to supply the selected voltage to a load.
  • the power supply circuit may further include a rectifying circuit arranged between an AC voltage source and the load, the rectifying circuit configured to full-wave rectify an AC voltage inputted and to output the rectified AC voltage.
  • a rectifying circuit arranged between an AC voltage source and the load, the rectifying circuit configured to full-wave rectify an AC voltage inputted and to output the rectified AC voltage.
  • the switching circuit may include a switch for supplying or cutting off the voltages outputted from the output ends and a controller for checking the change in the voltage magnitude or the voltage phase at the front end or the rear end of the multi-level voltage output circuit and outputting a control signal for use in controlling the switch.
  • the switch may include a multi-pole switch connected to one of the output ends in response to the control signal or a plurality of switching elements for supplying or cutting off the voltages outputted from the output ends in response to the control signal.
  • the multi-level voltage output circuit may be a voltage transformer provided with a plurality of tabs or a multi-coil voltage transformer having a plurality of secondary coils.
  • the multi-level voltage output circuit may include a plurality of voltage distributing elements serially connected to an AC voltage source so as to distribute a voltage pursuant to a voltage distribution principle and a plurality of tabs arranged between the voltage distributing elements.
  • Each of the voltage distributing elements may include one element selected from a resistor, an inductor and a capacitor, or two or more elements selected from the resistor, the inductor and the capacitor and connected to one another in series, in parallel or both.
  • the controller may include a voltage detecting circuit for detecting a region to which the voltage magnitude belongs or a phase detecting circuit for detecting the voltage phase.
  • the power supply circuit may further include a current limiting circuit connected to the load so as to limit an electric current flowing through the load.
  • the power supply circuit may include a voltage limiting circuit for suppressing excessive variation of the voltage inputted to the load.
  • the rectifying circuit may be a bridge diode circuit.
  • the power supply circuit may further include: an AC voltage cutoff switch for cutting off a voltage applied from an AC voltage source to the multi-level voltage output circuit.
  • the controller may be configured to adjust a ratio of an on-duration to an off-duration of an output voltage pulse by adjusting a switching interval of the switching circuit.
  • the power supply circuit may further include a protection circuit for protecting the multi-level voltage output circuit and the switching circuit from a surge voltage.
  • the power supply circuit may further include a charge-discharge circuit arranged between an AC voltage source and the load, the charge-discharge circuit configured to charge electric energy and to supply the charged electric energy to the load.
  • the charge-discharge circuit may be configured to discharge the electric energy when the instantaneous value of the voltage inputted to the load through the multi-level voltage output circuit is below the driving voltage of the load.
  • a power supply circuit includes: a voltage transformer including a primary coil provided with a plurality of tabs and a secondary coil connected to a load; and a switching circuit configured to apply a voltage having a periodically changing magnitude to a primary side of the voltage transformer through one tab selected from the plurality of tabs based on a change in a voltage magnitude or a voltage phase at a front end or a rear end of the voltage transformer, such that a voltage whose instantaneous value belongs to a predetermined range is outputted from the voltage transformer.
  • a power supply circuit includes: a multi-coil voltage transformer including a plurality of primary coils and a secondary coil connected to a load; and a switching circuit configured to apply a voltage having a periodically changing magnitude to a primary side of the voltage transformer through one primary coil selected from the plurality of primary coils based on a change in a voltage magnitude or a voltage phase at a front end or a rear end of the voltage transformer, such that a voltage whose instantaneous value belongs to a predetermined range is outputted from the multi-coil voltage transformer.
  • the power supply circuit may further include: a rectifying circuit arranged between an AC voltage source and the load, the rectifying circuit configured to full-wave rectify an AC voltage inputted and to output the rectified AC voltage.
  • a rectifying circuit arranged between an AC voltage source and the load, the rectifying circuit configured to full-wave rectify an AC voltage inputted and to output the rectified AC voltage.
  • a voltage selected from a plurality of voltages differing in amplitude, which are outputted by the multi-level voltage output circuit, is applied to a load. This provides an advantage in that it becomes possible to apply a voltage having a substantially constant magnitude to a load even though the magnitude of the AC voltage applied by the AC voltage source is continuously changed depending on the phase.
  • An AC voltage applied by a typical AC voltage source shows a change of about 10% in amplitude.
  • Some embodiments of the present invention provide an advantage in that, by use of the charge-discharge circuit, an electric current can be applied to a load in a region where the phase is around 180 degrees. If the LED is used as a load, it is possible to ameliorate a flickering phenomenon.
  • Fig. 1 is a block diagram schematically showing a power supply circuit according to the present invention.
  • Fig. 2 is a view schematically showing a power supply circuit according to one embodiment of the present invention.
  • Fig. 3 is a view representing voltages outputted from individual tabs.
  • Fig. 4 is a block diagram of a controller shown in Fig. 2.
  • Fig. 5 is a view for explaining the operation of the power supply circuit shown in Fig. 2.
  • Fig. 6 is a view showing the form of a voltage outputted from the rectifying circuit of the power supply circuit shown in Fig. 2.
  • Fig. 7 is a view illustrating the form of another voltage outputted from the rectifying circuit of the power supply circuit shown in Fig. 2.
  • Figs. 8 through 11 are views schematically showing power supply circuits according to other embodiments of the present invention.
  • Fig. 12 is a view illustrating the form of a voltage outputted from the switching circuit of the power supply circuit shown in Fig. 11.
  • Figs. 13 and 14 are views schematically showing power supply circuits according to additional embodiments of the present invention.
  • Fig. 15 is a view illustrating the form of a voltage applied to the load of the power supply circuit shown in Fig. 14.
  • Fig. 16 is a view schematically showing a power supply circuits according to a further additional embodiment of the present invention.
  • Fig. 1 is a block diagram schematically showing a power supply circuit according to the present invention.
  • the power supply circuit according to the present invention includes a multi-level voltage output circuit 3, a rectifying circuit 4, a switching circuit 5, a charge-discharge circuit 6 and a current/voltage limiting circuit 7.
  • a specific AC voltage selected from a plurality of AC voltages differing in amplitude, which are outputted from the multi-level voltage output circuit 3, is supplied to a load 2 to thereby ensure that the magnitude of a voltage applied to the load 2 falls within a specified range. If the magnitude of an outputted AC voltage is changed depending on the phase change and is deviated from the rated voltage range of the load 2, an AC voltage differing in amplitude is supplied to the load 2 by use of the switching circuit 5, thereby ensuring that an AC voltage having a magnitude falling within a specified range is continuously supplied to the load 2.
  • the multi-level voltage output circuit 3 is configured to receive an AC voltage from an AC voltage source 1 and to output a plurality of AC voltages differing in amplitude. Any type of circuit may be used as long as it can output a plurality of AC voltages differing in amplitude.
  • the multi-level voltage output circuit 3 may be a circuit in which passive elements such as an inductor, a capacitor and a resistor are serially connected to one another and tabs are installed between the passive elements so that AC voltages having different magnitudes can be outputted pursuant to a voltage distribution principle.
  • the multi-level voltage output circuit 3 may be a voltage transformer having a plurality of tabs installed at a primary side or a secondary side or may be a multi-coil voltage transformer having a plurality of coils wound at a primary side or a secondary side.
  • the voltage transformer may be a typical voltage transformer or an autotransformer in which a single coil is shared at a primary side and a secondary side.
  • the switching circuit 5 serves to select one of the AC voltages capable of being outputted from the multi-level voltage output circuit 3 and to supply the selected AC voltage to the rectifying circuit 4.
  • the switching circuit 5 may include a switch and a controller for controlling the switch by measuring the phase or magnitude of the AC voltage inputted to or outputted from the multi-level voltage output circuit 3.
  • the switching circuit 5 may be realized by many different methods, e.g., by a method of using a plurality of operational amplifiers (or transistors), other devices and a plurality of switching elements. When a plurality of operational amplifiers (or transistors) and other devices are used to control the switching elements, the switching elements may be directly controlled by the signals transmitted from a plurality of operational amplifiers (or transistors).
  • the rectifying circuit 4 serves to full-wave rectifying the AC voltage outputted from the multi-level voltage output circuit 3.
  • the rectifying circuit 4 may be a bridge diode circuit.
  • the rectifying circuit 4 may be installed between the multi-level voltage output circuit 3 and the switching circuit 5 or between the switching circuit 5 and the load 2. Alternatively, the rectifying circuit 4 may be installed between the AC voltage source 1 and the multi-level voltage output circuit 3.
  • the charge-discharge circuit 6 serves to discharge an electric current and supply a required electric current to the load 2 when the instantaneous value of the voltage inputted to the load 2 through the multi-level voltage output circuit 3 is below the driving voltage of the load 2.
  • the current/voltage limiting circuit 7 serves to limit a current or a voltage applied to the load 2.
  • a current limiting circuit may be realized by a method of combining a field effect transistor (FET) or a transistor (TR) and an auxiliary element or a method of using an integrated circuit such as an operation amplifier or a regulator.
  • a voltage limiting circuit may be used in place of the current limiting circuit.
  • the voltage limiting circuit may be formed of a resistor, a zener diode or a varistor.
  • Fig. 2 is a view schematically showing a power supply circuit according to one embodiment of the present invention.
  • the power supply circuit according to one embodiment of the present invention includes a multi-level voltage output circuit 10, a rectifying circuit 20, a switch 30, a controller 40 and a current limiting circuit 50.
  • the multi-level voltage output circuit 10 is configured to adjust the amplitude of an AC voltage applied by an AC voltage source 1 of 220 V and to output a plurality of AC voltages differing in amplitude.
  • the AC voltage source 1 is connected to the primary side 11 of the multi-level voltage output circuit 10.
  • a secondary coil 13 is wound at the secondary side 12 of the multi-level voltage output circuit 10 so that suitable voltages can be outputted depending on the rated voltage of LEDs used and the number of LEDs connected in series.
  • a plurality of tabs 14 is installed in the secondary coil 13. The tabs 14 are lead wires connected to specific positions between the opposite ends of the secondary coil 13. Use of the tabs 14 makes it possible to obtain a plurality of AC voltages differing in amplitude.
  • an LED array 2 formed by interconnecting ten LEDs having a drive voltage of from 5.5 V to 6.5 V is used as a load
  • a voltage of from 55 V to 65 V ten times as high as the drive voltage has to be applied in order to normally operate the LED array 2.
  • the secondary coil 13 is wound and the tabs 14 are installed at the secondary side 12 of the multi-level voltage output circuit 10 such that the AC voltage V1 outputted from the uppermost first tap 14-1 has a maximum value of 100 V, the AC voltage V2 outputted from the second tap 14-2 has a maximum value of 87 V, the AC voltage V3 outputted from the third tap 14-3 has a maximum value of 77 V and the AC voltage V4 outputted from the fourth tap 14-4 has a maximum value of 69 V.
  • Fig. 3 is a view illustrating the voltages outputted from the respective tabs 14. As shown in Fig. 3, the AC voltages V1 through V4 have the same phase and differ only in the maximum value.
  • the switch 30 includes a plurality of switching elements 30-1 through 30-4 installed on the lead wires extending from the respective tabs 14.
  • Each of the switching elements 30-1 through 30-4 may be a MOSFET (Metal Oxide Silicon Field Effect Transistor).
  • the controller 40 serves to apply a voltage to the gate of a MOSFET switch to thereby turn the MOSFET switch on and off.
  • Fig. 4 is a block diagram of the controller 40 shown in Fig. 2.
  • the controller 40 may include a memory 41, a voltage detecting circuit 42 and a switch control unit 43.
  • the voltage detecting circuit 42 is connected to the uppermost tab 14-1 to identify the range to which the AC voltage V1 outputted to the uppermost tab 14-1 belongs.
  • the voltage detecting circuit 42 may be one of circuits extensively used in the field of electronic circuits. For example, a voltage comparator formed of a plurality of operational amplifiers (or a plurality of transistors) and other devices may be used as the voltage detecting circuit 42.
  • Drive data for use in driving the switching elements 30-1 through 30-4 on a voltage range basis are stored in the memory 41.
  • the Drive data depend on the number of LEDs, the drive voltage of LEDs, the ratio of a primary coil to a secondary coil, the number of tabs of a voltage transformer and the interval of tabs.
  • drive data on the on/off time of the respective switching elements 30-1 through 30-4 may be stored in the memory 41.
  • the switch control unit 43 By comparing the drive data stored in the memory 41 and the value of the AC voltage detected by the voltage detecting circuit 42, the switch control unit 43 generates a control signal for controlling the switching elements 30-1 through 30-4 and transfers the control signal to the gates of the switching elements 30-1 through 30-4.
  • the AC voltage selected by the switch 30 is full-wave rectified in the rectifying circuit 20 and is then transferred to the LED array 2.
  • a bridge diode circuit may be used as the rectifying circuit 20.
  • the current limiting circuit 50 is configured to prevent an over-current from flowing through the LED array 2 and is serially connected to the LED array 2.
  • the current limiting circuit 50 may be realized by a resistor, a capacitor, a bipolar transistor, a MOS transistor or the like.
  • Fig. 5 is a view for explaining the operation of the power supply circuit shown in Fig. 2. If the AC voltage V1 measured in the controller 40 shows that the magnitude of the AC voltage V1 belongs to an A region (0 V to 35 V), all the switching elements 30-1 through 30-4 may be turned off. This is because the LEDs do not work but generate only heat in the A region.
  • the switching element 30-1 is turned on and the remaining switching elements 30-2 through 30-4 are all turned off.
  • the AC voltage V1 is inputted to the rectifying circuit 20 and the LED array 2 is operated by the full-wave rectified AC voltage V1.
  • the LED array 2 emits light even in a section where the magnitude of the AC voltage V1 is from 35 V to 55 V.
  • the switching element 30-2 is turned on and the remaining switching elements 30-1, 30-3 and 30-4 are all turned off.
  • the AC voltage V2 is inputted to the rectifying circuit 20 and the LED array 2 is operated by the full-wave rectified AC voltage V2.
  • the AC voltage V2 is approximately in a range of from 55 V to 65 V. Therefore, the AC voltage V2 is suitable for operating the LED array 2.
  • the AC voltages V1 through V4 have the same phase.
  • the magnitude ratios of the AC voltage V1 to the AC voltages V2, V3 and V4 are decided in advance by the positions of the tabs 14. It is therefore possible to know the magnitudes of the AC voltages V2, V3 and V4 by relying on only the AC voltage V1. Accordingly, it is possible to know a suitable output voltage by merely measuring the magnitude of the AC voltage V1. This makes it possible to control the switching elements 30-1 through 30-4. A change in the magnitude of one of the AC voltages V2, V3 and V4 may be measured by the voltage detecting circuit 42 instead of the change in the magnitude of the AC voltage V1.
  • the switching element 30-3 is turned on and the remaining switching elements 30-1, 30-2 and 30-4 are all turned off.
  • the AC voltage V3 is inputted to the rectifying circuit 20 and the LED array 2 is operated by the full-wave rectified AC voltage V3.
  • the switching element 30-4 is turned on and the remaining switching elements 30-1, 30-2 and 30-3 are all turned off.
  • the AC voltage V4 is inputted to the rectifying circuit 20 and the LED array 2 is operated by the full-wave rectified AC voltage V4.
  • the switching elements are turned on in a reverse order (30-3 -> 30-2 -> 30-1), at which time the remaining switching elements are all turned off.
  • the power supply circuit according to the present embodiment it is possible to obtain, as shown in Fig. 6, the same effect as provided when the LED array 2 is driven by a DC voltage varying in a range of from 35 V to 65 V.
  • a pulse having a duty cycle of about 78% and a frequency of 120 Hz it is possible to obtain an effect similar to the effect provided when the LED array 2 is driven by a pulse having a duty cycle of about 78% and a frequency of 120 Hz. If the number of the tabs and the number of the switching elements are increased, it is possible to further reduce the variation width of the output voltage.
  • Fig. 7 is a view illustrating the form of another voltage outputted from the rectifying circuit of the power supply circuit shown in Fig. 2.
  • the switching element 30-1 is kept turned on when the magnitude of the AC voltage V1 belongs to the B region.
  • the switching element 30-1 is repeatedly turned on and off so that a voltage can be outputted in a pulse form having a higher frequency.
  • the duty cycle and the frequency can be adjusted by adjusting the on/off time of the respective switching elements.
  • Fig. 8 is a view schematically showing a power supply circuit according to another embodiment of the present invention.
  • the embodiment shown in Fig. 8 differs from the embodiment shown in Fig. 2 in terms of a multi-level voltage output circuit 60 and a switch 70. Therefore, description will be made on only the differing points.
  • a plurality of coils 63-1 through 63-4 differing in the winding number is wound at the secondary side 62 of the multi-level voltage output circuit 60.
  • a multi-pole switch 70 selectively connectable to one of the lead wires extending from the respective coils 63-1 through 63-4 is used as the switch 70.
  • phase detecting circuit in place of the voltage detecting circuit can be used in the controller.
  • the phase detecting circuit may be formed of a zero-cross detector that can detect a moment at which an instantaneous value of a voltage of an alternating current becomes zero.
  • Fig. 9 is a view schematically showing a power supply circuit according to a further embodiment of the present invention.
  • tabs 103 are installed at the primary side 101 of a multi-level voltage output circuit 100.
  • a controller 90 controls a switch 80 by checking the magnitude or phase of a voltage applied by an AC voltage source 1. Since the controller 90 checks the magnitude or phase of the voltage applied by the AC voltage source 1 and then turns on one of the switching elements 80 connected to a specific tab 103 existing at the primary side 101, an AC voltage suitable for operating an LED array 2 is always induced at the secondary side 102. The AC voltage outputted is full-wave rectified by a rectifying circuit 20 and is then supplied to the LED array 2.
  • Fig. 10 is a view schematically showing a power supply circuit according to a still further embodiment of the present invention.
  • the power supply circuit further includes an AC voltage cutoff switch 120 for cutting off an AC voltage source 1, which is arranged at the primary side 11.
  • a controller 110 controls a switch 30 by checking the magnitude or phase of a voltage applied to the primary side 11 and not the secondary side 12. In the present embodiment, the controller 110 controls not only the switching elements 30-1 through 30-4 of the switch 30 but also the AC voltage cutoff switch 120. The controller 110 checks the magnitude or phase of a voltage at the primary side 11. If it is determined that a LED array 2 cannot be operated by the voltage induced at the secondary side 12, the controller 110 turns the AC voltage cutoff switch 120 off.
  • the AC voltage cutoff switch 120 may be a triac.
  • Fig. 11 is a view schematically showing a power supply circuit according to a yet still further embodiment of the present invention.
  • a multi-level voltage output circuit 130 includes a plurality of serially-connected resistors 131 and a plurality of tabs 132 arranged between the respective resistors 131 and between the resistors 131 and the AC voltage source 1. Switching elements 140 are installed on the lead wires extending from the respective tabs 132.
  • the resistors 131-1, 131-2 and 131-3 are serially connected to an LED array 8 and a voltage limiting circuit 51. If the second switching element 140-3 is turned on with the remaining switching elements 140-1, 140-2 and 140-4 turned off, the resistors 131-1 and 131-2 other than the lowermost resistor 131-3 are serially connected to the LED array 8 and the voltage limiting circuit 51. In this manner, it is possible to adjust the resistance value of the resistors serially connected to the LED array 8. Pursuant to the voltage distribution principle, an AC voltage having specified amplitude is applied to the LED array 8.
  • the resistance value of the serially-connected resistors is appropriately selected, it is possible to suitably adjust, when turning on each of the switching elements 140, the amplitude of the AC voltage applied to the LED array 8. This ensures that the voltage having the same waveform as shown in Fig. 12 is applied to the LED array 8.
  • the LED array 8 includes two LED strings 8-1 and 8-2 which are parallel-connected so that the polarities thereof can be reversed.
  • Each of the LED strings 8-1 and 8-2 includes a plurality of serially-connected LEDs. Upon applying a positive voltage, the LEDs of the LED string 8-1 positioned at the left side in Fig. 11 are caused to emit light. Upon applying a negative voltage, the LEDs of the LED string 8-2 positioned at the right side in Fig. 11 are caused to emit light.
  • the voltage limiting circuit 51 is a safety circuit for preventing application of an excessive voltage higher than a rated voltage to the LED array 8.
  • a voltage is distributed through the use of capacitors to which resistors are connected in parallel. While not shown in the drawings, a voltage may be distributed through the use of inductors. Alternatively, a voltage may be distributed by interconnecting a plurality of passive elements in series, in parallel or both.
  • the power supply circuit shown in Figs. 11 and 13 further includes a resistor 54 for protecting circuits from a surge voltage and a fuse 53 for protecting a main power source.
  • Fig. 14 is a view schematically showing a power supply circuit according to an even yet still further embodiment of the present invention.
  • the present embodiment remains the same as the embodiment shown in Fig. 11 except that there is provided a charge-discharge circuit 170. Therefore, description will be made on only the charge-discharge circuit 170.
  • the charge-discharge circuit 170 includes an inductor 171, a switching element 172 arranged between the inductor 171 and the AC voltage source 1, and a switching element 173 arranged between the inductor 171 and the load 8.
  • the respective switching elements 172 and 173 are controlled by a controller 150. If the switching element 172 arranged between the inductor 171 and the AC voltage source 1 is turned on and the switching element 173 arranged between the inductor 171 and the load 8 is turned off, electric energy is charged to the inductor 171.
  • a voltage having a waveform shown in Fig. 15 is supplied to the load 8.
  • the electric energy charged in the charge-discharge circuit 170 is discharged and supplied to the load 8 in a phase region of about 180 degrees where the magnitude of an AC voltage applied by the AC voltage source 1 becomes smallest.
  • Use of the charge-discharge circuit 170 provides an advantage in that it becomes possible to prevent a flickering phenomenon that the load such as the LED array 8 or the like gets turned off in a phase region of about 180 degrees and looks as if the load blinks.
  • Fig. 16 is a view schematically showing a power supply circuit according to an additionally even yet still further embodiment of the present invention.
  • the present embodiment remains the same as the embodiment shown in Fig. 8 except that there is provided a charge-discharge circuit 180.
  • the charge-discharge circuit 180 includes an inductor 181 and a switching element 182 arranged between the inductor 181 and the AC voltage source 1.
  • the electric energy charged in the inductor 181 is supplied to the load when the multi-pole switch 70 makes contact with the lead wire connected to the inductor 181 and when the switching element 182 arranged between the inductor 181 and the AC voltage source 1 gets turned off.
  • the charge-discharge circuit described above may be formed of a charge-discharge element such as a capacitor or the like in place of the inductor.

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  • Power Engineering (AREA)
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  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

L'invention concerne un circuit d'alimentation électrique comprenant un circuit de sortie de tension multi-niveaux et un circuit de commutation. Le circuit de sortie de tension multi-niveaux possède une borne d'entrée sur laquelle arrive une tension dont la grandeur change périodiquement et une pluralité de bornes de sortie à partir desquelles une pluralité de tensions d'amplitudes différente est délivrée. Le circuit de commutation est configuré pour sélectionner une tension dont la valeur instantanée se situe dans une plage prédéterminée parmi la pluralité de tensions délivrées par le circuit de sortie de tension multi-niveaux, sur la base d'une variation de la grandeur ou de la phase d'une tension au niveau d'une borne avant ou arrière du circuit de sortie de tension multi-niveaux. Le circuit de commutation est configuré pour fournir la tension sélectionnée à une charge.
PCT/KR2013/006320 2012-07-17 2013-07-15 Circuit d'alimentation électrique WO2014014248A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020120077766A KR101279493B1 (ko) 2012-07-17 2012-07-17 전원공급회로
KR10-2012-0077766 2012-07-17

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WO2014014248A1 true WO2014014248A1 (fr) 2014-01-23

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KR (1) KR101279493B1 (fr)
TW (1) TW201413410A (fr)
WO (1) WO2014014248A1 (fr)

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CN104615180A (zh) * 2014-11-12 2015-05-13 厦门安普利生物工程有限公司 数字式交流控制器

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