CN103533692B - For the supply unit of LED and the method for powering to LED - Google Patents
For the supply unit of LED and the method for powering to LED Download PDFInfo
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- CN103533692B CN103533692B CN201310271162.4A CN201310271162A CN103533692B CN 103533692 B CN103533692 B CN 103533692B CN 201310271162 A CN201310271162 A CN 201310271162A CN 103533692 B CN103533692 B CN 103533692B
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- voltage
- reference voltage
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- electric current
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- 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]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
- Dc-Dc Converters (AREA)
- Led Devices (AREA)
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Abstract
Disclose for the supply unit of LED and the method for powering to LED.This supply unit comprises: input AC voltage; Rectification module, for carrying out rectification to input AC voltage; Transistor, this transistor is switched on according to control signal or disconnects, to export the first electric current; Integrated circuit modules, for receiving the reference voltage according to the input AC voltage through rectification, and with reference to voltage compared with the source voltage of transistor, to generate control signal; Voltage compensation module, compensates for the deviation of boost voltage to input AC voltage by use integrated circuit modules, with generating reference voltage; And converter, for generating the second electric current to the first electric current conversion.
Description
Technical field
Embodiment relates to for the supply unit of LED and the method for powering to LED.
Embodiment provides a kind of supply unit for LED, even if this supply unit makes to apply different input AC voltage, also can send uniform light quantity to zero deflection.
According to embodiment, provide a kind of supply unit.This supply unit comprises: input AC voltage; Rectification module, for carrying out rectification to input AC voltage; Transistor, this transistor is switched on according to control signal or disconnects, to export the first electric current; Integrated circuit modules, for receiving the reference voltage according to the input AC voltage through rectification, and with reference to voltage compared with the source voltage of transistor, to generate control signal; Voltage compensation module, compensates for the deviation of boost voltage to input AC voltage by use integrated circuit modules, with generating reference voltage; And converter, for generating the second electric current to the first electric current conversion.
Integrated circuit modules can comprise: reference voltage terminal, for receiving reference voltage; Lead-out terminal, for exporting control signal; Source terminal, for the source voltage of receiving crystal pipe; And auxiliary terminal, for receiving boost voltage.
Voltage compensation module can comprise the compensation diode be placed between reference voltage terminal and boost voltage terminal.
The negative electrode compensating diode can be connected with boost voltage terminal.
Voltage compensation module can also comprise: be placed in the compensation condenser between Centroid and ground be connected with the anode compensating diode, and be connected to the compensating resistor between Centroid and reference voltage terminal.
Compensating resistor can have the resistance less than the internal resistance of the reference voltage terminal of integrated circuit.
Rectification module can comprise bridge rectifier.
The supply unit of claim can also comprise division module, and this division module is used for carrying out dividing potential drop, with generating reference voltage to the input AC voltage through rectification.
When inputting AC voltage and being low, voltage compensation module can reduce the negative voltage of reference voltage.
Supply unit can also comprise output module, and this output module is used for receiving the second electric current from converter and exporting the second electric current.
Second electric current can flow to light-emitting diode.
Supply unit can also comprise the damper (snubber) be arranged on before converter.
According to embodiment, provide a kind of method of power supply.The method comprises: receive input AC voltage, and carries out rectification to input AC voltage; Reference voltage is generated by carrying out dividing potential drop to the input AC voltage through rectification; Deviation according to the input AC voltage through rectification carrys out compensate for reference voltage, to generate the reference voltage through compensating; By the reference voltage through compensating is generated control signal compared with the source voltage of transistor; By being switched on or switched off transistor to generate according to control signal the first electric current; And by carrying out conversion to generate the second electric current to the first electric current.
Can by reference voltage lower than applying the negative voltage of boost voltage and the reference voltage that generates through compensating during voltage in preset range.
Boost voltage can have and depends on input AC voltage and the amplitude determined.
The method can also comprise supplies the second electric current to light-emitting diode.
As described above, according to embodiment, even if apply different input AC voltage, also zero deflection uniform light quantity can be sent.In addition, a kind of power circuit being applicable to various voltage by adding simple circuit can be provided.
In addition, based on internal auxiliary voltage according to the change of input voltage compensate for reference voltage, make it possible to improve the reliability of light-emitting diode.
Embodiment
Hereinafter, in detail embodiment is described with reference to the accompanying drawings, makes those of ordinary skill in the art easily can realize (work with) embodiment.But, those embodiments described below embodiment can be not limited to, and various amendment can be had.
In the following description, when predetermined part " comprises " predetermined parts, except as otherwise noted, otherwise this predetermined part does not get rid of miscellaneous part, but can also comprise miscellaneous part.
Embodiment provides a kind of luminaire, and this luminaire by compensating input voltage deviation by the PWM supply unit with PSR integrated circuit, and makes electric current can flow through light-emitting device equably.
Hereinafter, with reference to Fig. 4 to Fig. 9, the supply unit according to embodiment is described.
Fig. 4 shows the circuit diagram of the supply unit according to embodiment.Fig. 5 shows the circuit diagram of an example of the supply unit shown in Fig. 4.Fig. 6 and Fig. 7 shows the figure of the node voltage according to different input voltages of voltage compensation module and integrated circuit.Fig. 8 and Fig. 9 shows the figure of the output according to different input voltages of the supply unit shown in Fig. 5.
With reference to Fig. 4, supply unit 100 comprises and is placed in input AC voltage V
interminal and light-emitting device (LED) between converter 130.
Be placed on the primary circuit in the left side of converter 130 about received input AC voltage V
inperform pulse width modulation (PWM) to generate the first electric current.Converter 130 receives the first electric current, to generate second electric current of the LED of the secondary circuit that will be applied to the right side being placed on converter 130.
In this case, the first primary circuit comprises the driving transistors Q for generating the first electric current and the integrated circuit U1 for control signal being applied to driving transistors Q.
Integrated circuit U1 generates the control signal with the duty ratio determined according to following comparison value: this comparison value is by depending on input AC voltage V
inand the reference voltage of change obtains compared with the source voltage CS of driving transistors Q.
Integrated circuit U1 can have six terminals as shown in Figure 4, but embodiment is not limited to this.Although all terminals can be connected with peripheral circuit, part terminal also can not be connected with peripheral circuit.
Integrated circuit U1 comprises reference voltage terminal VRP, earth terminal GND, boost voltage terminal VCC, zero passage voltage terminal ZCV, source terminal CSP and lead-out terminal CD.In these terminals, zero passage voltage terminal ZCV can be omitted according to the function of integrated circuit U1.
Primary circuit comprises: rectifier module D a, for input AC voltage V
incarry out receiving, rectification and output; Division module 120, for to be applied to integrated circuit U1 reference voltage terminal VRP, from rectifier module D a receive the voltage through rectification carry out dividing potential drop; Resistor Re and resistor Rd, for receiving the electric current of the ancillary coil from converter 130, and carries out dividing potential drop to the voltage that will be transported to boost voltage terminal VCC and zero passage voltage terminal ZCV; And voltage compensation module 10, for the voltage VR of compensate for reference voltage terminal VRP.
Meanwhile, secondary circuit comprises for receiving the second electric current from converter 130 and making the second electric current can flow to the output module 140 of LED.
Rectifier module D a will have sine-shaped input AC voltage V
inbe rectified into the voltage with single polarity, make the voltage with single polarity be output to input node n0.Usually, rectifier module D a can comprise bridge rectifier.
Division module 120 can be included at least two resistor Ra and Rb and multiple capacitor (not shown) that are connected in series between input node n0 and ground.Through the input AC voltage V of rectification
independ on the resistance of resistor Ra and Rb be connected in series and by dividing potential drop, and be applied to reference voltage terminal VRP via the first node n1 be placed between resistor Ra and resistor Rb.
Meanwhile, the secondary circuit electric current comprised for exporting the coil from converter 130 carries out filtering and the electric current through filtering is exported to the output module 140 of LED.Output module 140 comprises filter, and this filter comprises output capacitor Co and output resistor Ro.
Meanwhile, although the reference voltage being supplied to reference voltage terminal VRP has and the input AC voltage V through rectification
in(input voltage V
in) the identical waveform of waveform and depend on input voltage V
inamplitude and change, but the reference voltage VR of integrated circuit U1 is arranged in preset range.
Therefore, even if input voltage V
inchange, the change of reference voltage VR is also limited.On the contrary, owing to being applied to the input voltage V of input node n0
inand cause the electric current flowing through driving transistors Q to change ad lib.
In other words, as input voltage V
inwhen being reduced to 110V from 220V as shown in Figures 2 and 3, although the change of reference voltage VR is limited, depends on the electric current flowing through transistor Q and the source voltage CS arranged reduces, make the electric current I flowing through LED
lEDvalue significantly reduce.
In order to prevent phenomenon above, according to embodiment, voltage compensation module 110 is additionally set, to be restrictively connected with the 3rd node n3 being connected to boost voltage terminal VCC by the first node n1 being connected to reference voltage terminal VRP.
Particularly, voltage compensation module 110 comprises compensation diode Dc, compensating resistor Rc and compensation condenser Cc.
The compensation diode Dc of voltage compensation module 110 has the negative electrode be connected with the 3rd node n3 and the anode be connected with Section Point n2.Compensation condenser Cc is connected between Section Point n2 and ground, and compensating resistor Rc is connected between first node n1 and Section Point n2.
In this case, the resistance of compensating resistor Rc is higher than the terminal resistance of the reference voltage terminal VRP of integrated circuit U1, and the electric current making it possible to prevent from flowing through reference voltage terminal VRP flows out via compensating resistor Rc.
With reference to Fig. 6 and Fig. 7, in voltage compensation module 110, the negative electrode compensating diode Dc is connected with the 3rd node n3, makes to only have negative voltage to be optionally applied to Section Point n2 from boost voltage terminal VCC.
Therefore, the voltage V2 at Section Point n2 place only has the negative voltage of the voltage at the 3rd node n3 place, and the voltage at boost voltage terminal VCC place and input voltage V
inproportional.Therefore, the amplitude of the voltage V2 at Section Point n2 place and input voltage V
inamplitude in proportion.
Therefore, as the input voltage V of Fig. 6
infor 110V and the input supply voltage V of Fig. 7
infor 220V is to make input voltage V
inwhen being increased to twice, the voltage V2 at Section Point n2 place has negative value and its absolute value is increased to twice.
The voltage V2 at Section Point n2 place is transformed into the rhythmic AC voltage of tool at first node n1 place after flowing through compensation condenser Cc and compensating resistor Rc.In this case, because the voltage V2 at the Section Point n2 place when the input supply voltage of 110V is higher than the voltage V2 at Section Point n2 place when input supply voltage at 220V, the voltage V1 at the first node n1 place therefore when the input supply voltage of 220V has larger amplitude.
Therefore, although input voltage V
inbe increased to 220V from 110V as shown in Figure 7, but the negative amplitude of reference voltage VR increases, make it possible to the output signal generating the comparison value representing source voltage CS and reference voltage VR in integrated circuit U1 consistently.
As mentioned above, regardless of input voltage V
inhow, all generate the output signal with constant duty ratio, make it possible to as shown in Figure 8 and Figure 9, regardless of input voltage V
inhow, the electric current I flowing through LED detected all consistently
lEDvalue.
Hereinafter, with reference to Fig. 5, the application of embodiment is described.
With reference to Fig. 5, supply unit is the amendment of the supply unit 100 of Fig. 4.Division module 120 can comprise three resistors R1, R2 and R3, and can arrange in the prime of converter 130 damper 150 comprising resistor R5 to R7 and capacitor C3.
The integrated circuit U1 of Fig. 5 also comprises for receiving input voltage V
interminal HV, and arrange in the prime of the terminal of integrated circuit U1 and be used for carrying out the filter (RC filter) of filtering to ripple and being used as the diode D2 to D4 of switching device.
The amplitude of each element differently can be applied according to circuit design.Fig. 6 to Fig. 9 illustrates the data value produced by emulation after the magnitude optimum of each element of the supply unit 100 shown in Fig. 5.
Although described exemplary embodiment of the present invention; it should be understood that; the present invention should not be limited to these exemplary embodiments, but can make various change and amendment by those of ordinary skill in the art in the spirit and scope of hereafter the present invention for required protection.
Background technology
Light-emitting device (LED) is semiconductor PN device.LED is for being the emitting semiconductor of luminous energy by electric energy conversion.LED comes luminous by applying electric current to compound semiconductor terminal via the combination at the electronics of PN junction part or active layer place and hole.
Fig. 1 shows the circuit diagram of the supply unit for driving LED according to correlation technique, and Fig. 2 and Fig. 3 shows the figure of the output of relevant AC voltage.
With reference to Fig. 1, supply unit passes through pulse width modulation (PWM) scheme by AC voltage V
aCbe transformed into DC voltage, and control light quantity according to pulse duration.
The supply unit of Fig. 1 adopts and regulates the integrated circuit U1 of (PSR) scheme to come from primary circuit production burst signal, then supply amplifying signal by converter (transformer) to secondary circuit based on primary side, powers thus to the LED being connected to secondary circuit.
PSR integrated circuit U1 receives reference voltage VR from AC voltage, and the comparison value obtained compared with the source voltage CS of transistor Q by reference to voltage VR is exported to the grid of transistor Q, as control signal.
The duty ratio of control signal is determined according to the comparison value by obtaining compared with the source voltage CS of transistor Q with reference to voltage VR.
If transistor Q is switched on according to control signal or disconnects making current direction drain, the output signal of so being amplified by the converter be connected with drain electrode is applied to LED.
In this case, about the configuration of the peripheral circuit of integrated circuit U1, as shown in Figure 1, peripheral circuit comprises multiple resistor R1 to R14, multiple capacitor C1 to C8 and multiple diode D1 to D5, but embodiment is not limited to this.
Meanwhile, standard AC voltage depends on country and changes, and is arranged in the scope of 90V to 240V.Typically, domestic standard AC voltage is 220V, and usually uses the standard AC voltage of 110V in Japan and the U.S..
When identical integrated circuit is applied to various AC voltage as described above, obtain result as shown in Figures 2 and 3.
Fig. 2 shows the AC voltage V when applying 220V
aCtime the figure of output, and Fig. 3 shows the AC voltage V when applying 110V
aCtime the figure of output.
Fig. 2 (a) and Fig. 3 (a) shows the reference voltage VR of integrated circuit U1 and the source voltage CS of transistor.Fig. 2 (b) and Fig. 3 (b) shows the average voltage VLED of LED, and Fig. 2 (c) and Fig. 3 (c) shows the average current I of LED
lED.
With reference to Fig. 2 and Fig. 3, if AC voltage V
aCbe reduced to 110V from 220V as shown in Figure 3, the electric current so flowing through LED significantly reduces, and thereby reduces light quantity.
Summary of the invention
Accompanying drawing explanation
Fig. 1 shows the circuit diagram of the power circuit according to correlation technique.
Fig. 2 and Fig. 3 shows the figure of the output according to different input voltages of the supply unit of Fig. 1.
Fig. 4 shows the circuit diagram of the supply unit according to embodiment.
Fig. 5 shows the circuit diagram of an example of the supply unit shown in Fig. 4.
Fig. 6 and Fig. 7 shows the figure of the node voltage according to different input voltages of voltage compensation module and integrated circuit.
Fig. 8 and Fig. 9 shows the figure of the output according to different input voltages of the supply unit shown in Fig. 5.
Claims (13)
1. a supply unit, comprising:
Input AC voltage;
Rectification module, described rectification module is connected with the described AC voltage that inputs, and is configured to carry out rectification to described input AC voltage;
Division module, described division module is connected with described rectification module, and is configured to come via first node generating reference voltage by carrying out dividing potential drop to the AC voltage through rectification;
Transistor, described in described transistor AND gate, rectification module is connected, and is configured to export the first electric current by being switched on based on control signal or disconnecting;
Converter, described converter is connected with described transistor, and is configured to by carrying out conversion to generate the second electric current to described first electric current;
Integrated circuit modules, the boost voltage terminal that described integrated circuit modules comprises the reference voltage terminal be connected with the described first node of described division module, the source terminal be connected with the source electrode of described transistor and is connected with the ancillary coil of described converter, and be configured to: receive described reference voltage from described reference voltage terminal, the source voltage of described transistor is received from described source terminal, from described boost voltage terminal reception boost voltage, and by described reference voltage compared with described source voltage to generate described control signal; And
Voltage compensation module, described voltage compensation module is placed between described reference voltage terminal and described boost voltage terminal, and be configured to restrictively described first node is connected with the 3rd node being connected to described boost voltage terminal, to compensate described reference voltage;
Wherein, described voltage compensation module comprises:
Compensate diode, described compensation diode has the anode be connected with Section Point and the negative electrode be connected with described 3rd node,
Be connected to the compensation condenser between described Section Point and ground, and
Be connected to the compensating resistor between described first node and described Section Point,
Wherein, described compensating resistor has the resistance lower than the internal resistance of the described reference voltage terminal of described integrated circuit modules.
2. supply unit according to claim 1, wherein, described integrated circuit modules also comprises: lead-out terminal, for exporting described control signal; And zero passage voltage terminal, for receiving described boost voltage.
3. supply unit according to claim 1, wherein, described rectification module comprises bridge rectifier.
4. supply unit according to claim 1, wherein, when described input AC voltage is low, described voltage compensation module reduces the negative voltage of described reference voltage.
5. supply unit according to claim 1, also comprises: the output module be connected with described converter, is configured to receive described second electric current from described converter and export described second electric current.
6. supply unit according to claim 1, wherein, described second current direction light-emitting diode.
7. supply unit according to claim 1, also comprises the damper be arranged on before described converter.
8. a method for power supply, described method comprises:
Receive input AC voltage, and rectification is carried out to described input AC voltage;
Come via first node generating reference voltage by carrying out dividing potential drop to the input AC voltage through rectification, and described reference voltage is provided to reference voltage terminal that be connected with described first node, integrated circuit;
By voltage compensation module, restrictively three node of described first node with the boost voltage terminal being connected to described integrated circuit is connected, to utilize the boost voltage at described boost voltage terminal place to compensate described reference voltage;
By the reference voltage through compensating is generated control signal compared with the source voltage of transistor;
By being switched on or switched off described transistor to generate the first electric current according to described control signal; And
By carrying out conversion to generate the second electric current to described first electric current,
Wherein, described voltage compensation module comprises:
Compensate diode, described compensation diode has the anode be connected with Section Point and the negative electrode be connected with described 3rd node,
Be connected to the compensation condenser between described Section Point and ground, and
Be connected to the compensating resistor between described first node and described Section Point,
Wherein, described compensating resistor has the resistance lower than the internal resistance of described reference voltage terminal.
9. method according to claim 8, wherein, compensates described reference voltage and comprises: when described reference voltage is lower than voltage in preset range, apply the negative voltage of described boost voltage.
10. method according to claim 9, wherein, described boost voltage has and depends on described input AC voltage and the amplitude determined.
11. methods according to claim 8, also comprise to described second electric current of light-emitting diode supply.
12. methods according to claim 10, wherein, compensate described reference voltage and comprise: when described input AC voltage is low, reduce the negative voltage of described reference voltage.
13. methods according to claim 8, wherein, carry out rectification to described input AC voltage and comprise application bridge rectifier.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2012-0071254 | 2012-06-29 | ||
| KR1020120071254A KR101976631B1 (en) | 2012-06-29 | 2012-06-29 | The power supply device for LED and the method for supplying power to LED |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103533692A CN103533692A (en) | 2014-01-22 |
| CN103533692B true CN103533692B (en) | 2015-10-28 |
Family
ID=49935262
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310271162.4A Expired - Fee Related CN103533692B (en) | 2012-06-29 | 2013-07-01 | For the supply unit of LED and the method for powering to LED |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR101976631B1 (en) |
| CN (1) | CN103533692B (en) |
| TW (1) | TWI507085B (en) |
Citations (3)
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|---|---|---|---|---|
| WO2004012480A1 (en) * | 2002-07-25 | 2004-02-05 | Varon Lighting, Inc. | Point of use lighting controller |
| CN101977466A (en) * | 2010-11-02 | 2011-02-16 | 深圳市富满电子有限公司南山分公司 | White light-emitting diode drive circuit |
| CN102291896A (en) * | 2011-09-07 | 2011-12-21 | 上海晶丰明源半导体有限公司 | Light emitting diode (LED) constant current control circuit with input voltage sampling and compensation function |
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| US7068022B2 (en) | 2001-11-13 | 2006-06-27 | Power Integrations, Inc. | Method and apparatus for a switch mode power supply that generates a high pulse width modulation gain while maintaining low noise sensitivity |
| JP2004088959A (en) * | 2002-08-28 | 2004-03-18 | Sharp Corp | Switching power supply unit |
| US6911809B2 (en) * | 2002-11-14 | 2005-06-28 | Fyre Storm, Inc. | Switching power supply controller |
| KR100820613B1 (en) * | 2005-09-16 | 2008-04-08 | 엔이씨 라이팅 가부시키가이샤 | Low voltage power supply circuit for lighting, lighting apparatus, and low voltage power supply output method for lighting |
| JP5103728B2 (en) * | 2005-11-24 | 2012-12-19 | ウシオ電機株式会社 | Discharge lamp lighting device |
| EP2213144A1 (en) | 2007-10-26 | 2010-08-04 | Lighting Science Group Corporation | High efficiency light source with integrated ballast |
| KR101549040B1 (en) * | 2008-07-11 | 2015-09-01 | 삼성전자 주식회사 | Backlight assembly display device comprising the same and control method thereof |
| TWI423728B (en) * | 2010-05-26 | 2014-01-11 | Tpv Electronics Fujian Co Ltd | Driving circuit for single-string light-emitting diode (led) lamp |
| US9263967B2 (en) * | 2010-07-22 | 2016-02-16 | Earl W. McCune | AC/DC power conversion methods and apparatus |
-
2012
- 2012-06-29 KR KR1020120071254A patent/KR101976631B1/en active IP Right Grant
-
2013
- 2013-06-27 TW TW102123014A patent/TWI507085B/en not_active IP Right Cessation
- 2013-07-01 CN CN201310271162.4A patent/CN103533692B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004012480A1 (en) * | 2002-07-25 | 2004-02-05 | Varon Lighting, Inc. | Point of use lighting controller |
| CN101977466A (en) * | 2010-11-02 | 2011-02-16 | 深圳市富满电子有限公司南山分公司 | White light-emitting diode drive circuit |
| CN102291896A (en) * | 2011-09-07 | 2011-12-21 | 上海晶丰明源半导体有限公司 | Light emitting diode (LED) constant current control circuit with input voltage sampling and compensation function |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20140003226A (en) | 2014-01-09 |
| CN103533692A (en) | 2014-01-22 |
| TWI507085B (en) | 2015-11-01 |
| TW201406198A (en) | 2014-02-01 |
| KR101976631B1 (en) | 2019-08-28 |
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