CN105554961A - Backflash prevention circuit of full-voltage high-power light emitting diode (LED) driving secondary circuit - Google Patents
Backflash prevention circuit of full-voltage high-power light emitting diode (LED) driving secondary circuit Download PDFInfo
- Publication number
- CN105554961A CN105554961A CN201610079664.0A CN201610079664A CN105554961A CN 105554961 A CN105554961 A CN 105554961A CN 201610079664 A CN201610079664 A CN 201610079664A CN 105554961 A CN105554961 A CN 105554961A
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- Prior art keywords
- circuit
- backflash
- electronic switch
- voltage
- electric capacity
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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
-
- 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]
Abstract
The invention discloses a backflash prevention circuit of a full-voltage high-power light emitting diode (LED) driving secondary circuit. The backflash prevention circuit comprises a primary voltage constant circuit and a secondary current constant circuit which are sequentially connected, wherein a first capacitor used for stabilizing a power supply is connected to the primary voltage constant circuit, a second capacitor used for stabilizing the power supply is connected to the secondary current constant circuit, the two ends of the first capacitor are connected in parallel with a voltage division circuit, a positive electrode of the second capacitor is connected with a discharging circuit, an electronic switch is arranged in the discharging circuit, a control end of the electronic switch is connected with the output end of the voltage division circuit, one end of a conduction path of the electronic switch is connected with the positive electrode of the second capacitor, and one end of the conduction path is grounded. The electronic switch is adopted as a rapid discharging channel of a post-stage circuit, and the problem of backflash of an LED is solved; with the isolation effect of the electronic switch, the primary voltage constant circuit and the secondary current constant circuit are conveniently adjusted to an optimal driving state; and the whole circuit is simple and reliable in design, and the driving efficiency is obviously improved.
Description
Technical field
The present invention relates to LED drive circuit, refer in particular to full voltage great power LED and drive the anti-backflash circuit of secondary circuit.
Background technology
In high-power LED drive circuit, often all relating to two-stage drive circuit, comprise constant pressure portion and constant current part, in order to make power good in circuit working, needing in secondary circuit, all access bulky capacitor (being greater than 10uf).But can cause like this occurring more serious backflash phenomenon when LED turns off the light, tracing it to its cause is because when drive circuit cuts out, wherein the capacitor discharge of rear class partial circuit is not prompt enough, still maintains certain voltage.For this reason, there is technical staff on this electric capacity, to devise discharge resistance specially, also have and adopt additional IC to judge and its path of fast shut-off.But be that discharge resistance or IC decision circuitry all can bring larger efficiency pressure to drive circuit, driving effect of existing secondary drive circuit generally preferably can reach 87% to 89%.In addition, adopt discharge resistance to capacitor discharge and be not suitable for powerful drive circuit, reason is fast not for the velocity of discharge of electric capacity.
Summary of the invention
The present invention proposes a kind of full voltage great power LED and drive the anti-backflash circuit of secondary circuit, can high efficiency drive be realized, and effectively can solve backflash problem when LED turns off the light.
To achieve these goals, the present invention adopts following technical scheme: a kind of full voltage great power LED drives the anti-backflash circuit of secondary circuit, comprise the one-level constant voltage circuit and secondary constant-current circuit that connect successively, the first electric capacity of stabilized power supply is connected with in one-level constant voltage circuit, the second electric capacity of stabilized power supply is connected with at secondary constant-current circuit, a two ends bleeder circuit in parallel of the first electric capacity, the positive pole of the second electric capacity connects a discharge loop, an electronic switch is provided with in described discharge loop, the control end of described electronic switch connects the output of described bleeder circuit, guiding path one end of electronic switch connects the positive pole of the second electric capacity, one end ground connection.The conveying relation on voltage is inherently there is between one-level constant voltage circuit and secondary constant-current circuit, if LED drive circuit is closed, then pressure drop signal can be sent to electronic switch by bleeder circuit naturally in real time, the direct ground connection of second electric capacity is then directly discharged according to the pressure drop situation of bleeder circuit by electronic switch, whole circuit design is succinct, by one-level constant voltage circuit and secondary constant-current circuit being isolated with electronic switch, be beneficial to two parts circuit and be adjusted to optimal drive state separately, whole circuit design drive efficiency improves thereupon.
As preferably, being formed by three resistant series of bleeder circuit.
As preferably, the control end of described electronic switch connects one of them electric resistance partial pressure place of bleeder circuit, and this dividing potential drop place magnitude of voltage is the control signal of electronic switch.
As preferably, described discharge loop comprises a diode be connected between the second capacitance cathode and electronic switch, and the positive pole of diode connects the positive pole of the second electric capacity.Again effective isolation is carried out to the operating current between electronic switch and the second electric capacity by diode, prevented oppositely.
As preferably, described electronic switch is a PNP type triode, and the emitter of this triode connects the positive pole of the second electric capacity, and base stage connects the output of bleeder circuit, grounded collector.
As preferably, described PNP type triode is that multiplication factor is 100 to 150 times.
As preferably, described one-level constant voltage circuit comprises a BOST circuit, and the first described capacitance cathode connects the voltage output end of BOST circuit, minus earth.
As preferably, described secondary constant-current circuit comprises a BUCK reduction voltage circuit, and the second described capacitance cathode connects the constant voltage end of BUCK reduction voltage circuit, minus earth.
Compared to existing technology, advantage of the present invention is mainly: have employed electronic switch, as triode, as late-class circuit repid discharge passage, solve LED backflash problem, the buffer action that make use of again electronic switch itself facilitates one-level constant voltage circuit and secondary constant-current circuit is adjusted to optimal drive state, and whole circuit design is succinctly reliable, and drive efficiency significantly improves.Have employed low-power PNP type triode, and the supporting bleeder circuit of three resistant series, obtain less sample rate current, raise the efficiency further.
Figure of description
Fig. 1 is circuit diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
The present embodiment relates to, some technical terms in drive circuit, conveniently subsequent descriptions, and first carry out necessary explanation, BOST circuit refers to a kind of switch DC booster circuit, and BUCK reduction voltage circuit refers to that current parameters carries out the circuit converted.Be BOST circuit see Fig. 1, U1, U2 is BUCK reduction voltage circuit.
Again see Fig. 1, the present embodiment relates to a kind of full voltage great power LED and drives the anti-backflash circuit of secondary circuit, full voltage alleged in the present embodiment refers to that input voltage is AC90-250V, if Fig. 1 input voltage is by the complete rectification of full-bridge type rectification circuit, again through the work of driving LED afterwards of one-level constant voltage circuit and secondary constant-current circuit, in the present embodiment, one-level constant voltage circuit comprises BOST circuit U 1, and secondary constant-current circuit comprises BUCK reduction voltage circuit U2.Wherein be connected to the positive pole of the first electric capacity C1 at the voltage output end of BOST circuit U 1, and the voltage incoming end of BUCK reduction voltage circuit U2 is connected to the second electric capacity C2, two above-mentioned electric capacity negative poles have all connect ground, are all stabilized power supplys.An also in parallel bleeder circuit 1 at the two ends of the first electric capacity C1, this bleeder circuit adopts three circuit connected in series to form in the present embodiment, employing electric current can be dropped to suitable value like this, and export rational magnitude of voltage, the magnitude of voltage being wherein positioned at the resistance of bottom is the output voltage of bleeder circuit, this output voltage is connected to the control end of an electronic switch, and this electronic switch is again the discharge channel of the second electric capacity C2.
In the present embodiment, described electronic switch is a PNP type triode Q1, and the emitter of this triode connects the positive pole of the second electric capacity, and the output that base stage connects bleeder circuit 1 obtains its output voltage, grounded collector.When drive circuit driving LED works, the output of bleeder circuit 1 is greater than the emitter voltage of this triode, this PNP type triode Q1 described keeps turning off, once drive circuit closes electricity, then the cathode voltage of the first electric capacity C1 first falls, and the base stage of PNP type triode Q1 is reflected into by bleeder circuit 1, when the output of bleeder circuit 1 is less than the emitter voltage of this triode, then PNP type triode Q1 conducting, second electric capacity C2 also discharges rapidly, effectively can prevent the LED backflash problem caused not in time because the second electric capacity C2 discharges.In order to make whole circuit working more stable, also connected a diode D1 between the second electric capacity C2 positive pole and the emitter of PNP type triode Q1, wherein the positive pole of diode D1 connects the second electric capacity C2 positive pole, again effective isolation is carried out to the operating current between electronic switch and the second electric capacity by diode, prevented oppositely.Certain electronic switch also can adopt other mode, and example adopts pressure sensitive components and parts.
Preferred as the present embodiment.Under the cooperation of bleeder circuit 1, described PNP type triode is that multiplication factor is 100 to 150 times.
By above-mentioned circuit and operation principle, the present embodiment not only effectively can solve the problem of LED backflash, and whole circuit design is succinctly reliable, drives effect to be promoted to 92%.
Except above preferred embodiment, the present invention also has other execution mode, and those skilled in the art can make various change according to the present invention, only otherwise depart from spirit of the present invention, all should belong to the scope that claims of the present invention define.
Claims (8)
1. a full voltage great power LED drives the anti-backflash circuit of secondary circuit, comprise the one-level constant voltage circuit and secondary constant-current circuit that connect successively, the first electric capacity of stabilized power supply is connected with in one-level constant voltage circuit, the second electric capacity of stabilized power supply is connected with at secondary constant-current circuit, it is characterized in that: a two ends bleeder circuit in parallel of the first electric capacity, the positive pole of the second electric capacity connects a discharge loop, an electronic switch is provided with in described discharge loop, the control end of described electronic switch connects the output of described bleeder circuit, guiding path one end of electronic switch connects the positive pole of the second electric capacity, one end ground connection.
2. full voltage great power LED according to claim 1 drives the anti-backflash circuit of secondary circuit, it is characterized in that: being formed by three resistant series of bleeder circuit.
3. full voltage great power LED according to claim 2 drives the anti-backflash circuit of secondary circuit, it is characterized in that: the control end of described electronic switch connects one of them electric resistance partial pressure place of bleeder circuit, and this dividing potential drop place magnitude of voltage is the control signal of electronic switch.
4. full voltage great power LED according to claim 1 drives the anti-backflash circuit of secondary circuit, it is characterized in that: described discharge loop comprises a diode be connected between the second capacitance cathode and electronic switch, the positive pole of diode connects the positive pole of the second electric capacity.
5. full voltage great power LED according to claim 1 drives the anti-backflash circuit of secondary circuit, it is characterized in that: described electronic switch is a PNP type triode, the emitter of this triode connects the positive pole of the second electric capacity, and base stage connects the output of bleeder circuit, grounded collector.
6. full voltage great power LED according to claim 5 drives the anti-backflash circuit of secondary circuit, it is characterized in that: described PNP type triode is that multiplication factor is 100 to 150 times.
7. full voltage great power LED according to claim 1 drives the anti-backflash circuit of secondary circuit, it is characterized in that: described one-level constant voltage circuit comprises a BOST circuit, and the first described capacitance cathode connects the voltage output end of BOST circuit, minus earth.
8. full voltage great power LED according to claim 1 drives the anti-backflash circuit of secondary circuit, it is characterized in that: described secondary constant-current circuit comprises a BUCK reduction voltage circuit, the second described capacitance cathode connects the constant voltage end of BUCK reduction voltage circuit, minus earth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610079664.0A CN105554961A (en) | 2016-01-29 | 2016-01-29 | Backflash prevention circuit of full-voltage high-power light emitting diode (LED) driving secondary circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610079664.0A CN105554961A (en) | 2016-01-29 | 2016-01-29 | Backflash prevention circuit of full-voltage high-power light emitting diode (LED) driving secondary circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105554961A true CN105554961A (en) | 2016-05-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610079664.0A Pending CN105554961A (en) | 2016-01-29 | 2016-01-29 | Backflash prevention circuit of full-voltage high-power light emitting diode (LED) driving secondary circuit |
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| CN (1) | CN105554961A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105960068A (en) * | 2016-07-08 | 2016-09-21 | 上海灿瑞科技股份有限公司 | Circuit for preventing power back flash of LED lamp |
| CN112004283A (en) * | 2020-09-09 | 2020-11-27 | 陕西亚成微电子股份有限公司 | LED drive control method and circuit |
-
2016
- 2016-01-29 CN CN201610079664.0A patent/CN105554961A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105960068A (en) * | 2016-07-08 | 2016-09-21 | 上海灿瑞科技股份有限公司 | Circuit for preventing power back flash of LED lamp |
| CN112004283A (en) * | 2020-09-09 | 2020-11-27 | 陕西亚成微电子股份有限公司 | LED drive control method and circuit |
| CN112004283B (en) * | 2020-09-09 | 2021-11-23 | 陕西亚成微电子股份有限公司 | LED drive control method and circuit |
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Application publication date: 20160504 |