CN102905435A - 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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- CN102905435A CN102905435A CN2012103941614A CN201210394161A CN102905435A CN 102905435 A CN102905435 A CN 102905435A CN 2012103941614 A CN2012103941614 A CN 2012103941614A CN 201210394161 A CN201210394161 A CN 201210394161A CN 102905435 A CN102905435 A CN 102905435A
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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, is used 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, the 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 energy-saving run state at special time period by timer, namely can realize regularly two sections dimming functions.But sort circuit can not be realized at any time light modulation to LED, and the hop count of light modulation can only be two sections, can't 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 can't be suitable for.Also have at present the LED light fixture that carries out light modulation by special dimmer, it need to arrange at the mains switch place special dimmer, so cost is higher.In addition, also have the LED light fixture that carries out light modulation by wireless remote control, it need to arrange wireless receiver at each LED light fixture, and cost is high, needs one by one operation 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 a plurality of 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 the led light source load, alternating current is become galvanic rectification circuit, carry out the constant-current circuit of current stabilization for described led light source load, described rectification circuit is by mains switch access mains-supplied circuit, the switch dimming circuit of described wide voltage high-power-factor LED lamp also comprises voltage stabilizing and pfc circuit, adjusting control circuit, described voltage stabilizing and pfc circuit are connected to after the described rectification circuit, before the described led light source load, described voltage stabilizing and pfc circuit comprise the PFC integrated chip, the 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 described mains switch in the time at 0.5～3s continuously during switch, described adjusting control circuit induction power supply switching signal, and export in closed several the different loops of connecting of circulation successively, each loop output 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, control the ON time of described output switch pipe by 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, sectional dimming is carried out in described led light source load.
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 every group of described constant-current source device is in series with at least one group of LED in the described led light source load and is connected.
Every group of described 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 consists of another contact with grid phase short circuit; Perhaps, every group of described constant-current source device comprises at least one N channel junction field-effect transistors, and 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 consists of another contact with grid phase short circuit.
Perhaps, every group of described constant-current source device comprises at least one constant current integrated circuit.
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 the overcurrent protection protective tube.
The switch dimming circuit of described wide voltage high-power-factor LED lamp also comprises the power lightning protection circuit, and described power lightning protection circuit is connected to before the described rectification circuit.
The switch dimming circuit of described wide voltage high-power-factor LED lamp also comprises power supply EMC circuit, and described power supply EMC circuit is connected to before the 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, and described light source EMC circuit is connected to after described voltage stabilizing and the pfc circuit, before the described led light source load.
The switch dimming circuit of described wide voltage high-power-factor LED lamp also comprises the 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, described voltage stabilizing and pfc circuit are connected to after the described rectification circuit, before the described led light source load, described voltage stabilizing and pfc circuit comprise the PFC integrated chip, the 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 described mains switch in the time at 0.5～3s continuously during switch, described adjusting control circuit induction power supply switching signal, and export in closed several the different loops of connecting of circulation successively, each loop output 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, control the ON time of described output switch pipe by 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, sectional dimming is carried out in described led light source load; The present invention can be linked into by common switch the civil power ac power circuit, normal disconnection and closure by common switch, can carry out simultaneously at any time the multi-section circulation light modulation so that organize described led light source load more, 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 a plurality of light fixtures of centralized control, can carry out at any time the multistage light modulation.
Description of drawings
Fig. 1 is the electrical block diagram of the embodiment of the invention one;
Fig. 2 is the electrical block diagram of the embodiment of the invention two;
Fig. 3 is the chip internal schematic block circuit diagram of the segmentation control integration circuit of the embodiment of the invention;
Fig. 4 is the equivalent circuit diagram of the segmentation control integration circuit of the embodiment of the invention;
Fig. 5 is the control waveform figure of the segmentation control integration circuit of the embodiment of the invention;
Fig. 6 is the schematic diagram of each function pin of the PFC integrated chip of the embodiment of the invention;
Fig. 7 is the internal circuit theory diagram of the PFC integrated chip of the embodiment of the invention.
Embodiment
Embodiment one:
Such as Fig. 1; Fig. 3～shown in Figure 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 galvanic rectification circuit 4; carry out the constant-current circuit 7 of current stabilization for 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; the usefulness that is used for overcurrent and short-circuit protection; described power lightning protection circuit 2 is connected to after the described current foldback circuit 1; before the described rectification circuit 4; the usefulness that is used for lightning protection; comprise piezo-resistance RV1; RV2; R1; negative tempperature coefficient thermistor NTC; discharge tube DSA1; filter capacitor C1; described power supply EMC circuit 3 is connected to after the described power lightning protection circuit 2; before the 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 positioned at before the input of power supply by mains switch; 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; be connected to after the described rectification circuit 4; before the 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; it is the power supply PFC power factor control circuit of MC33262 that described PFC integrated chip U1 adopts model; 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; each is organized between the LED and is in parallel; comprise the LED that several are in series in each group; every group of LED that is in series can consist of separately independently light source or a light fixture; therefore can realize a plurality of light fixture centralized control; described constant-current circuit 7 comprises some groups of constant-current source devices; every group of described 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 consists of another contact with grid phase short circuit, and every group of described constant-current source device is in series with one group of LED in the described led light source load 6 and is connected, so that every group of LED can both obtain stable operating current; avoid overcurrent to burn; increase the service life, described adjusting control circuit 8 comprises segmentation control integration circuit U 2, and 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 described mains switch within the blink of setting (during such as 0.5～3s) continuous switch; described adjusting control circuit 8 induction power supply switching signals; and circulation is closed successively connects several different loops output, and is specific as follows: by mains switch is opened and closed, for the first time during the closed electrical source switch; at 4 pin CP of described segmentation control integration circuit U 2 induction rising string signal; 2 pin Q1 connect with ground, and during for the second time folding mains switch, 1 pin Q2 connects with ground; for the third time during the folding mains switch; 8 pin Q3 connect with ground, and during the 4th folding mains switch, 7 pin Q4 connect with ground; during the 5th folding mains switch; 6 pin Q5 connect with ground, and like this circulation, 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; sectional dimming is carried out in described led light source load 6; disconnecting namely open circuit such as mains switch, to surpass 10s closed again, circuit reset then, namely sectional dimming since the first time closed electrical source switch re-start circulation; described light source EMC circuit 10 is connected to after described voltage stabilizing and the pfc circuit 5; before the 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) do not having under the state of 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 then i.e. also thereupon rising of 1 pin voltage of sampled voltage end A, the Vref=2.5V that sets with described PFC integrated chip U1 compares, output voltage error amplifier can descend, the background current value of multiplier output is descended, so that the ON time of described output switch pipe Q1 shortens, the electric current that flows through inductance T2 descends, thereby makes the voltage drop of voltage output end B; Otherwise, output voltage is risen, to reach the purpose of regulated output voltage, finally make simultaneously sampled voltage end A namely 1 pin voltage stabilization identical with reference voltage, i.e. 2.5V; Therefore, the circuit of described PFC integrated chip U1 can when sampled voltage end A voltage uprises, reduce the voltage of total output.
(2) be provided with under the state of light adjusting circuit of the present invention, the sampled voltage of sampled voltage end A is by resistance R 9, R17, among R18 and the R11～R15 one by the series connection dividing potential drop obtain, when switching five outputs of described segmentation control integration circuit U 2 by mains switch, if resistance becomes large after the switching of R11～R15, then descend divider resistance to increase, sampled voltage end A i.e. 1 pin voltage rises, utilize the principle of above-mentioned " circuit of described PFC integrated chip U1 can be when sampled voltage end A voltage uprises; reduce the voltage of total output ", the Vref=2.5V that sets with described PFC integrated chip U1 compares, output voltage error amplifier can descend, the background current value of multiplier output is descended, so that the ON time of described output switch pipe Q1 shortens, the electric current that flows through inductance T2 descends, thereby make the voltage drop of voltage output end B, and final so that sampled voltage end A is that 1 pin voltage stabilization is 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 has realized reducing the purpose of power consumption and light modulation.
Embodiment two:
Such as Fig. 2～shown in Figure 7, the switch dimming circuit of the wide voltage high-power-factor LED lamp of the present embodiment and the difference of embodiment one are: the present embodiment also comprises fan cooling circuit 9, with the LED light fixture of coupling with radiator fan, described fan cooling circuit 9 comprises light fixture fan electromotor FAN, three fan shunt resistance R16, R21, R22 reaches and 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 according to the factors such as situation of the watt level of light fixture and side circuit certain specific voltage between 5～24V DC, so that the voltage control of described light fixture fan electromotor FAN within the specific limits, it is too high that the switching surge of avoiding a plurality of light fixtures to open simultaneously generation impacts the instantaneous voltage that causes, minimizing impacts described light fixture fan electromotor FAN, avoid fan to damage, guarantee the heat radiation stable operation of whole circuit, described fan shunt resistance R16, R21, R22 is used 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 one.
Above embodiment only illustrates, be not to be limitation of the present invention, described led light source load 6 also can be single light fixture or the light source that is made of many groups of several LED that are in series, and every group of described led light source load be connected in series one or more described constant-current source devices, and perhaps the described led light source load of many groups is connected in series one or more described constant-current source devices.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 consists of another contact with grid phase short circuit, namely adopt the described N channel depletion type insulated gate FET among the N channel junction field-effect transistors replacement embodiment, the function of the two realization is identical with effect, perhaps, every group of described constant-current source device comprises at least one constant current integrated circuit, namely 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 are so that circuit element greatly reduces, 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 galvanic rectification circuit (4), carry out the constant-current circuit (7) of current stabilization for described led light source load (6), described rectification circuit (4) is by mains switch access mains-supplied circuit, 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 described mains switch in the time at 0.5～3s continuously during 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 (R11～R15) of different resistances, thereby adjust the voltage of described sampled voltage end (A), and feed back to described PFC integrated chip (U1), ON time by described PFC integrated chip (U1) the described output switch pipe of control (Q1), 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), sectional dimming is carried out in described led light source load (6).
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 every group of described constant-current source device is in series with at least one group of LED in the described led light source load (6) and is connected.
3. the switch dimming circuit of wide voltage high-power-factor LED lamp according to claim 2, it is characterized in that: every group of described 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 consists of another contact with grid phase short circuit; Perhaps, every group of described constant-current source device comprises at least one N channel junction field-effect transistors, and 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 consists of another contact with grid phase short circuit.
4. the switch dimming circuit of wide voltage high-power-factor LED lamp according to claim 2, it is characterized in that: every group of described 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), and 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), and 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 claim 1 to the switch dimming circuit of the described wide voltage high-power-factor LED lamp of 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 (R16, R21, R22) and the fan voltage stabilizing didoe (D4) in parallel with described fan shunt resistance (R16, R21, R22).
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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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| 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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| CN107277971A (en) * | 2017-06-16 | 2017-10-20 | 浙江阳光美加照明有限公司 | A kind of light-controlled switching circuit of LED |
| 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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| CN102905435B (en) | 2014-07-09 |
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