CN102905435B - Wide-voltage high-power-factor light emitting diode (LED) lamp switching and dimming circuit - Google Patents
Wide-voltage high-power-factor light emitting diode (LED) lamp switching and dimming circuit Download PDFInfo
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- CN102905435B CN102905435B CN201210394161.4A CN201210394161A CN102905435B CN 102905435 B CN102905435 B CN 102905435B CN 201210394161 A CN201210394161 A CN 201210394161A CN 102905435 B CN102905435 B CN 102905435B
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Abstract
The invention discloses a wide-voltage high-power-factor light emitting diode (LED) lamp switching and dimming circuit. The circuit comprises an LED light source load (6), a rectifier circuit (4), a constant current circuit (7), a voltage stabilizing and power factor correction (PFC) circuit (5) and a dimming control circuit (8), wherein the voltage stabilizing and PFC circuit (5) comprises a PFC integrated chip (U1) and an output switching tube (Q1); the output end of the dimming control circuit (8) is connected with the sampling voltage end (A) of the voltage output end (B) of the voltage stabilizing and PFC circuit (5); and when power switch is continually turned on and turned off in a time range of 0.5-second to 3-second, the dimming control circuit (8) is sequentially and circulatingly closed to connect different loop outputs, regulates the voltage of the sampling voltage end (A) by using different sampling resistors with different resistance values, feeds back the voltage to the PFC integrated chip (U1), controls the turn-on time of the output switching tube (Q1), regulates the output voltage of the voltage output end (B) and the input voltage of the voltage input end (C) of the LED light source load (6), and performs segmented dimming on the LED light source load (6). The circuit can be applied in the field of LED lighting circuits.
Description
Technical field
The present invention relates to a kind of light adjusting circuit of LED lamp, relate in particular to a kind of switch dimming circuit of wide voltage high-power-factor LED lamp.
Background technology
At present, the application of LED is more and more extensive, for daily indoor also just more and more universal with LED light fixture outdoor lighting.In a lot of occasions, need the light fixture can light modulation, LED light fixture is like this equally.The applicant had once applied for the patent of " LED light fixture energy-saving control circuit " on January 22nd, 2009, its patent No. is ZL200910036887.9, it can realize the energy-saving run state at special time period by timer, can realize two sections of dimming functions of timing.But sort circuit can not be realized light modulation at any time to LED, and the hop count of light modulation can only be two sections, cannot realize the more light modulation of multistage, therefore at any time can light modulation for needs, and the higher occasion of requirement of light regulation cannot be suitable for.The LED light fixture that at present carries out light modulation by special dimmer in addition, it need to arrange special dimmer at mains switch place, and therefore cost is higher.In addition, the LED light fixture that carries out light modulation by wireless remote control in addition, it need to arrange wireless receiver on each LED light fixture, and cost is high, need to operate one by one for a large amount of lamp light-regulatings, uses trouble.
Summary of the invention
Technical problem to be solved by this invention is to overcome the deficiencies in the prior art, provide a kind of simple in structure, cost is low, can the multiple light fixtures of centralized control, can carry out at any time the switch dimming circuit of the wide voltage high-power-factor LED lamp of multistage light modulation.
The technical solution adopted in the present invention is: the present invention includes LED light source load, alternating current is become to galvanic rectification circuit, for the constant-current circuit of current stabilization is carried out in described LED light source load, described rectification circuit accesses mains-supplied circuit by mains switch, the switch dimming circuit of described wide voltage high-power-factor LED lamp also comprises voltage stabilizing and pfc circuit, adjusting control circuit, after described voltage stabilizing and pfc circuit are connected to described rectification circuit, before described LED light source load, described voltage stabilizing and pfc circuit comprise PFC integrated chip, output switch pipe, the output of described adjusting control circuit is connected with the sampled voltage end of the voltage output end of described voltage stabilizing and pfc circuit, when in the time of described mains switch at 0.5～3s continuously when switch, described adjusting control circuit induction power supply switching signal, and export in closed several the different loops of connecting of circulation successively, the output of each loop is connected to the sampling resistor of different resistances, thereby adjust the voltage of described sampled voltage end, and feed back to described PFC integrated chip, by the ON time of output switch pipe described in the control of described PFC integrated chip, thereby adjust the output voltage of described voltage output end, and adjust the input voltage of the voltage input end of described LED light source load, described LED light source load is carried out to sectional dimming.
Described LED light source load comprises at least one group of several LED that are in series, and described constant-current circuit comprises at least one group of constant-current source device, and described in every group, constant-current source device is in series and is connected with at least one group of LED in described LED light source load.
Described in every group, constant-current source device comprises at least one N channel depletion type insulated gate FET, the drain electrode of described N channel depletion type insulated gate FET is a contact, and the source electrode of described N channel depletion type insulated gate FET forms another contact with grid phase short circuit; Or constant-current source device comprises at least one N channel junction field-effect transistors described in every group, the drain electrode of described N channel junction field-effect transistors is a contact, and the source electrode of described N channel junction field-effect transistors forms another contact with grid phase short circuit.
Or constant-current source device comprises at least one constant current integrated circuit described in every group.
The switch dimming circuit of described wide voltage high-power-factor LED lamp also comprises current foldback circuit, and described current foldback circuit is connected to the input of power supply, and described current foldback circuit comprises overcurrent protection protective tube.
The switch dimming circuit of described wide voltage high-power-factor LED lamp also comprises power lightning protection circuit, before described power lightning protection circuit is connected to described rectification circuit.
The switch dimming circuit of described wide voltage high-power-factor LED lamp also comprises power supply EMC circuit, before described power supply EMC circuit is connected to described rectification circuit; Described rectification circuit adopts bridge rectifier.
The switch dimming circuit of described wide voltage high-power-factor LED lamp also comprises light source EMC circuit, after described light source EMC circuit is connected to described voltage stabilizing and pfc circuit, before described LED light source load.
The switch dimming circuit of described wide voltage high-power-factor LED lamp also comprises fan cooling circuit.
Described fan cooling circuit comprises light fixture fan electromotor, at least one fan shunt resistance and the fan voltage stabilizing didoe in parallel with described fan shunt resistance.
The invention has the beneficial effects as follows: owing to the present invention includes voltage stabilizing and pfc circuit, adjusting control circuit, after described voltage stabilizing and pfc circuit are connected to described rectification circuit, before described LED light source load, described voltage stabilizing and pfc circuit comprise PFC integrated chip, output switch pipe, the output of described adjusting control circuit is connected with the sampled voltage end of the voltage output end of described voltage stabilizing and pfc circuit, when in the time of described mains switch at 0.5～3s continuously when switch, described adjusting control circuit induction power supply switching signal, and export in closed several the different loops of connecting of circulation successively, the output of each loop is connected to the sampling resistor of different resistances, thereby adjust the voltage of described sampled voltage end, and feed back to described PFC integrated chip, by the ON time of output switch pipe described in the control of described PFC integrated chip, thereby adjust the output voltage of described voltage output end, and adjust the input voltage of the voltage input end of described LED light source load, described LED light source load is carried out to sectional dimming, the present invention can be linked into civil power ac power circuit by common switch, by normal disconnection and the closure of common switch, make the described LED light source load of many groups can carry out at any time multi-section circulation light modulation simultaneously, do not need traditional dimmer, do not need independently receiver of remote-control sytem yet, thus the present invention is simple in structure, cost is low, can the multiple light fixtures of centralized control, can carry out at any time multistage light modulation.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of the embodiment of the present invention one;
Fig. 2 is the electrical block diagram of the embodiment of the present invention two;
Fig. 3 is the chip internal schematic block circuit diagram of the segmentation control integration circuit of the embodiment of the present invention;
Fig. 4 is the equivalent circuit diagram of the segmentation control integration circuit of the embodiment of the present invention;
Fig. 5 is the control waveform figure of the segmentation control integration circuit of the embodiment of the present invention;
Fig. 6 is the schematic diagram of each function pin of the PFC integrated chip of the embodiment of the present invention;
Fig. 7 is the internal circuit theory diagram of the PFC integrated chip of the embodiment of the present invention.
Embodiment
Embodiment mono-:
As Fig. 1, shown in Fig. 3～Fig. 7, the switch dimming circuit of the wide voltage high-power-factor LED lamp of the present embodiment comprises LED light source load 6, alternating current is become to galvanic rectification circuit 4, for the constant-current circuit 7 of current stabilization is carried out in described LED light source load 6, voltage stabilizing and pfc circuit 5, adjusting control circuit 8, current foldback circuit 1, power lightning protection circuit 2, power supply EMC circuit 3, light source EMC circuit 10, described current foldback circuit 1 is connected to the input of power supply, described current foldback circuit 1 comprises overcurrent protection protective tube F0, for the use of overcurrent and short-circuit protection, after described power lightning protection circuit 2 is connected to described current foldback circuit 1, before described rectification circuit 4, for the use of lightning protection, comprise piezo-resistance RV1, RV2, R1, negative tempperature coefficient thermistor NTC, discharge tube DSA1, filter capacitor C1, after described power supply EMC circuit 3 is connected to described power lightning protection circuit 2, before described rectification circuit 4, so that circuit meets EMC Requirements, comprise resistance R 2, capacitor C 2～C4, C14, common mode inductance T1, T4, differential mode inductance L4, L5, described rectification circuit 4 is by mains switch (before being positioned at the input of power supply, not shown) access mains-supplied circuit, it is rectifier bridge D1 that described rectification circuit 4 adopts bridge rectifier, can certainly adopt other rectifier system rectifications, described voltage stabilizing and pfc circuit 5 are circuit of power factor correction, after being connected to described rectification circuit 4, before described LED light source load 6, be used to described LED light source load 6 that the direct current of voltage stabilization is provided, and improve the power factor of whole circuit, described voltage stabilizing and pfc circuit 5 are Switching Power Supplies, described voltage stabilizing and pfc circuit 5 comprise PFC integrated chip U1, output switch pipe Q1, described PFC integrated chip U1 adopts the power supply PFC power factor control circuit that model is MC33262, its peripheral cell comprises capacitor C 5～C11, resistance R 3～R9, R17, R18, diode D2, D3, voltage stabilizing didoe DZ, transformer/inductance T2, resistance R T, described LED light source load 6 comprises some groups of LED, between each group LED, be in parallel, in each group, comprise the LED that several are in series, every group of LED being in series can form separately independently light source or a light fixture, therefore can realize multiple light fixture centralized control, described constant-current circuit 7 comprises some groups of constant-current source devices, described in every group, constant-current source device comprises a N channel depletion type insulated gate FET Q2, Q5, each described depletion type insulated gate FET Q2, the drain electrode of Q5 is a contact, each described depletion type field insulated gate FET Q5, the source electrode of Q5 forms another contact with grid phase short circuit, described in every group, constant-current source device is in series and is connected with one group of LED in described LED light source load 6, so that every group of LED can obtain stable operating current, avoid overcurrent to burn, increase the service life, described adjusting control circuit 8 comprises segmentation control integration circuit U 2, it has five output Q1～Q5, each output is connected to the sampling resistor R11～R15 of different resistances, its peripheral cell also comprises capacitor C 12, C13, resistance R 19, R20, diode D9, voltage stabilizing didoe DZ1, five outputs of described adjusting control circuit 8 are connected with the sampled voltage end A of the voltage output end B of described voltage stabilizing and pfc circuit 5, when (as 0.5～3s) in the blink that described mains switch is being set is continuously when switch, described adjusting control circuit 8 induction power supply switching signals, and export in closed several the different loops of connecting of circulation successively, it is specific as follows: by mains switch is opened and closed, for the first time when closed electrical source switch, at 4 pin CP induction rising string signals of described segmentation control integration circuit U 2, 2 pin Q1 connect with ground, for the second time when folding mains switch, 1 pin Q2 connects with ground, for the third time when folding mains switch, 8 pin Q3 connect with ground, when the 4th folding mains switch, 7 pin Q4 connect with ground, when the 5th folding mains switch, 6 pin Q5 connect with ground, and circulation like this, thereby adjust the voltage of described sampled voltage end A, and feed back to described PFC integrated chip U1, control the ON time of described output switch pipe Q1 by described PFC integrated chip U1, thereby adjust the output voltage of described voltage output end B, and adjust the input voltage of the voltage input end C of described LED light source load 6, described LED light source load 6 is carried out to sectional dimming, as disconnecting i.e. open circuit, mains switch exceedes 10s closure again, circuit reset, being sectional dimming starts to re-start circulation from closed electrical source switch for the first time, after described light source EMC circuit 10 is connected to described voltage stabilizing and pfc circuit 5, before described LED light source load 6, described light source EMC circuit 10 comprises common mode inductance T3, differential mode inductance L1, L2.
The present invention utilizes the concrete principle of described PFC integrated chip U1 as follows:
(1) under the state that there is no light adjusting circuit, the output voltage of the voltage output end B of described voltage stabilizing and pfc circuit 5 keeps stable by following control procedure: in the circuit of described PFC integrated chip U1, if rising appears in the voltage of voltage output end B, the i.e. also rising thereupon of 1 pin voltage of sampled voltage end A, the Vref=2.5V setting with described PFC integrated chip U1 compares, output voltage error amplifier can decline, the background current value of multiplier output is declined, the ON time of described output switch pipe Q1 is shortened, the electric current that flows through inductance T2 declines, thereby make the voltage drop of voltage output end B, otherwise, make output voltage increase, to reach the object of regulated output voltage, finally make simultaneously sampled voltage end A 1 pin voltage stabilization identical with reference voltage, i.e. 2.5V, therefore, the circuit of described PFC integrated chip U1 can, in the time that sampled voltage end A voltage uprises, reduce the voltage of total output.
(2) under the state that is provided with light adjusting circuit of the present invention, the sampled voltage of sampled voltage end A is by resistance R 9, R17, in R18 and R11～R15, obtain by series connection dividing potential drop for one, while switching five outputs of described segmentation control integration circuit U 2 by mains switch, if resistance becomes large after the switching of R11～R15, descend divider resistance to increase, sampled voltage end A i.e. 1 pin voltage rises, utilize that above-mentioned " circuit of described PFC integrated chip U1 can be in the time that sampled voltage end A voltage uprises, reduce the voltage of total output " principle, the Vref=2.5V setting with described PFC integrated chip U1 compares, output voltage error amplifier can decline, the background current value of multiplier output is declined, the ON time of described output switch pipe Q1 is shortened, the electric current that flows through inductance T2 declines, thereby make the voltage drop of voltage output end B, and finally make sampled voltage end A 1 pin voltage stabilization identical with reference voltage, be 2.5V, and the direct voltage of the voltage input end C of described LED light source load 6 equates with the direct voltage of voltage output end B, therefore, the lower voltage of described LED light source load 6, realize the object that reduces power consumption and light modulation.
Embodiment bis-:
As shown in Figure 2 to 7, the switch dimming circuit of the wide voltage high-power-factor LED lamp of the present embodiment and the difference of embodiment mono-are: the present embodiment also comprises fan cooling circuit 9, LED light fixture with coupling with radiator fan, described fan cooling circuit 9 comprises light fixture fan electromotor FAN, three fan shunt resistance R16, R21, R22 and with described fan shunt resistance R16, R21, the fan voltage stabilizing didoe D4 of R22 parallel connection, the voltage stabilizing working point of described fan voltage stabilizing didoe D4 can be chosen to be certain specific voltage between 5～24V DC according to factors such as the situations of the watt level of light fixture and side circuit, make the voltage control of described light fixture fan electromotor FAN within the specific limits, it is too high that the switching surge of avoiding multiple light fixtures simultaneously to open generation impacts the instantaneous voltage causing, reduce described light fixture fan electromotor FAN is impacted, avoid fan to damage, guarantee the heat radiation stable operation of whole circuit, described fan shunt resistance R16, R21, R22 is for the shunting of high-power circuit, the high temperature of avoiding single resistance to bring.
All the other features of the present embodiment are identical with embodiment mono-.
Above embodiment only illustrates, it is not limitation of the present invention, described LED light source load 6 can be also single light fixture or the light source being made up of many groups of several LED that are in series, and the one or more described constant-current source devices of LED light source load serial connection described in every group, or organize the one or more described constant-current source devices of described LED light source load serial connection more.Described constant-current source circuit also can comprise at least one N channel junction field-effect transistors, the drain electrode of described N channel junction field-effect transistors is a contact, the source electrode of described N channel junction field-effect transistors forms another contact with grid phase short circuit, adopt N channel junction field-effect transistors to replace the described N channel depletion type insulated gate FET in embodiment, the function of the two realization is identical with effect, or, described in every group, constant-current source device comprises at least one constant current integrated circuit, adopts traditional constant-current circuit also passable.Certainly, independently device is as described constant-current source device to adopt one, and peripheral voltage stabilizing and the current stabilization circuit of existing other constant-current source integrated circuits of more convenient replacement, greatly reduce circuit element, circuit is simple, cost is low.
The present invention can be widely used in LED lighting circuit field.
Claims (10)
1. the switch dimming circuit of a wide voltage high-power-factor LED lamp, comprise LED light source load (6), alternating current is become to galvanic rectification circuit (4), for the constant-current circuit (7) of current stabilization is carried out in described LED light source load (6), described rectification circuit (4) accesses mains-supplied circuit by mains switch, it is characterized in that: the switch dimming circuit of described wide voltage high-power-factor LED lamp also comprises voltage stabilizing and pfc circuit (5), adjusting control circuit (8), described voltage stabilizing and pfc circuit (5) are connected to described rectification circuit (4) afterwards, described LED light source load (6) before, described voltage stabilizing and pfc circuit (5) comprise PFC integrated chip (U1), output switch pipe (Q1), the output of described adjusting control circuit (8) is connected with the sampled voltage end (A) of the voltage output end (B) of described voltage stabilizing and pfc circuit (5), when in the time of described mains switch at 0.5～3s continuously when switch, described adjusting control circuit (8) induction power supply switching signal, and export in closed several the different loops of connecting of circulation successively, the output of each loop is connected to the sampling resistor of different resistances, thereby adjust the voltage of described sampled voltage end (A), and feed back to described PFC integrated chip (U1), control the ON time of described output switch pipe (Q1) by described PFC integrated chip (U1), thereby adjust the output voltage of described voltage output end (B), and adjust the input voltage of the voltage input end (C) of described LED light source load (6), described LED light source load (6) is carried out to sectional dimming.
2. the switch dimming circuit of wide voltage high-power-factor LED lamp according to claim 1, it is characterized in that: described LED light source load (6) comprises at least one group of several LED that are in series, described constant-current circuit (7) comprises at least one group of constant-current source device, and described in every group, constant-current source device is in series and is connected with at least one group of LED in described LED light source load (6).
3. the switch dimming circuit of wide voltage high-power-factor LED lamp according to claim 2, it is characterized in that: described in every group, constant-current source device comprises at least one N channel depletion type insulated gate FET, the drain electrode of described N channel depletion type insulated gate FET is a contact, and the source electrode of described N channel depletion type insulated gate FET forms another contact with grid phase short circuit; Or constant-current source device comprises at least one N channel junction field-effect transistors described in every group, the drain electrode of described N channel junction field-effect transistors is a contact, and the source electrode of described N channel junction field-effect transistors forms another contact with grid phase short circuit.
4. the switch dimming circuit of wide voltage high-power-factor LED lamp according to claim 2, is characterized in that: described in every group, constant-current source device comprises at least one constant current integrated circuit.
5. the switch dimming circuit of wide voltage high-power-factor LED lamp according to claim 1; it is characterized in that: the switch dimming circuit of described wide voltage high-power-factor LED lamp also comprises current foldback circuit (1); described current foldback circuit (1) is connected to the input of power supply, and described current foldback circuit (1) comprises overcurrent protection protective tube (F0).
6. the switch dimming circuit of wide voltage high-power-factor LED lamp according to claim 1, it is characterized in that: the switch dimming circuit of described wide voltage high-power-factor LED lamp also comprises power lightning protection circuit (2), described power lightning protection circuit (2) is connected to described rectification circuit (4) before.
7. the switch dimming circuit of wide voltage high-power-factor LED lamp according to claim 1, it is characterized in that: the switch dimming circuit of described wide voltage high-power-factor LED lamp also comprises power supply EMC circuit (3), described power supply EMC circuit (3) is connected to described rectification circuit (4) before; Described rectification circuit (4) adopts bridge rectifier.
8. the switch dimming circuit of wide voltage high-power-factor LED lamp according to claim 1, it is characterized in that: the switch dimming circuit of described wide voltage high-power-factor LED lamp also comprises light source EMC circuit (10), described light source EMC circuit (10) be connected to described voltage stabilizing and pfc circuit (5) afterwards, described LED light source load (6) before.
9. according to the switch dimming circuit of the wide voltage high-power-factor LED lamp described in claim 1 to 8 any one, it is characterized in that: the switch dimming circuit of described wide voltage high-power-factor LED lamp also comprises fan cooling circuit (9).
10. the switch dimming circuit of wide voltage high-power-factor LED lamp according to claim 9, is characterized in that: described fan cooling circuit (9) comprises light fixture fan electromotor (FAN), at least one fan shunt resistance and the fan voltage stabilizing didoe (D4) in parallel with described fan shunt resistance.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210394161.4A CN102905435B (en) | 2012-10-17 | 2012-10-17 | Wide-voltage high-power-factor light emitting diode (LED) lamp switching and dimming circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210394161.4A CN102905435B (en) | 2012-10-17 | 2012-10-17 | Wide-voltage high-power-factor light emitting diode (LED) lamp switching and dimming circuit |
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| CN102905435A CN102905435A (en) | 2013-01-30 |
| CN102905435B true CN102905435B (en) | 2014-07-09 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103368377A (en) * | 2013-07-17 | 2013-10-23 | 华南理工大学 | Preceding-stage EMI filtering protective circuit of driving power source |
| CN103354086B (en) * | 2013-08-06 | 2015-09-30 | 深圳市华星光电技术有限公司 | LED backlight and liquid crystal display |
| CN104913208A (en) * | 2014-03-12 | 2015-09-16 | 河南新飞利照明科技有限责任公司 | Led point light source lamp |
| CN105451403B (en) * | 2014-06-20 | 2019-01-22 | 欧普照明股份有限公司 | The lighting system of light emission luminance section grade control method and circuit, sectional dimming |
| CN104619097B (en) * | 2014-11-20 | 2017-01-18 | 广州南科集成电子有限公司 | Switch light-dimming drive circuit of narrow-voltage LED lamp and light-dimming control system of LED lamp |
| CN107306027B (en) * | 2016-04-18 | 2021-01-26 | 中兴通讯股份有限公司 | Switching power supply's lightning protection device and switching power supply |
| CN107277971B (en) * | 2017-06-16 | 2023-08-29 | 浙江阳光美加照明有限公司 | Light-operated switch circuit of LED lamp |
| CN109068441A (en) * | 2018-08-02 | 2018-12-21 | 苏州欧普照明有限公司 | A kind of LED sectional dimming circuit |
| CN113905486A (en) * | 2020-06-22 | 2022-01-07 | Oppo广东移动通信有限公司 | Flash lamp control method and device, electronic equipment and computer readable storage medium |
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| CN101541116A (en) * | 2008-03-19 | 2009-09-23 | 杨书水 | Electronic ballast of alternate current high-power LED illumination energy-saving lamp |
| CN201887983U (en) * | 2010-11-19 | 2011-06-29 | 上海卓一电子有限公司 | Energy-saving LED colored light driving power source |
| CN202873141U (en) * | 2012-10-17 | 2013-04-10 | 广州南科集成电子有限公司 | Switch dimming circuit of wide-voltage high-power factor LED lamp |
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Patent Citations (3)
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| CN101541116A (en) * | 2008-03-19 | 2009-09-23 | 杨书水 | Electronic ballast of alternate current high-power LED illumination energy-saving lamp |
| CN201887983U (en) * | 2010-11-19 | 2011-06-29 | 上海卓一电子有限公司 | Energy-saving LED colored light driving power source |
| CN202873141U (en) * | 2012-10-17 | 2013-04-10 | 广州南科集成电子有限公司 | Switch dimming circuit of wide-voltage high-power factor LED lamp |
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