CN204119605U - Without the high constant current accuracy LED drive circuit of stroboscopic - Google Patents
Without the high constant current accuracy LED drive circuit of stroboscopic Download PDFInfo
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- CN204119605U CN204119605U CN201420524626.8U CN201420524626U CN204119605U CN 204119605 U CN204119605 U CN 204119605U CN 201420524626 U CN201420524626 U CN 201420524626U CN 204119605 U CN204119605 U CN 204119605U
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- transporting discharging
- integrated transporting
- feedback signal
- drive circuit
- led driver
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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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The utility model relates to a kind of high constant current accuracy LED drive circuit without stroboscopic, and this high constant current accuracy LED drive circuit, comprising: the interior LED driver containing metal-oxide-semiconductor and feedback signal input terminal, the energy-storage units be connected with this LED driver; Described energy-storage units is undertaken being coupled to obtain feedback signal by mutual inductance with a feedback loop, and this feedback signal inputs to described feedback signal input terminal.The utility model improves the integrated level of drive circuit by the interior LED driver containing metal-oxide-semiconductor and feedback signal input terminal, only needs a LED driver can avoid LED stroboscopic problem; By built-in over-voltage protective, the peripheral circuit of LED drive circuit is simplified more, better reliability; This LED driver there will not be phenomenon of having the hiccups, when output voltage is higher than overvoltage protection reference voltage, directly locked, protects LED driver further.
Description
Technical field
The utility model relates to a kind of LED drive circuit, particularly relates to a kind of high constant current accuracy LED drive circuit without stroboscopic.
Background technology
Lighting field, about the injury that stroboscopic causes human body, existing relevant biology and medical research, one, may brain cell injury be caused, two, reading and eyesight may be affected, three, reduce operating efficiency and cause industrial injury.In order to overcome above-mentioned defect, LED illumination can be adopted.
Although what LED illumination lamp adopted is that Constant Direct Current is powered, may realize completely without stroboscopic constant illumination in theory.But in fact, from the cost consideration of LED drive circuit, production firm's major part is all adopt one pole pfc circuit.Therefore, the electric current outputting to LED is not straight line.So, still can produce LED stroboscopic in various degree.
One pole pfc circuit is for LED application, and LED light effect can be on the low side, and easy light decay.Originally the LED of 350mA, the actual LED peak current that flows through is possibly to 600 ~ 700mA, and in the meantime, LED light effect is deteriorated, and heat strengthens.If need high PFC must consider to do two-stage current, prime one pole PFC does a constant voltage, and voltage transitions is become constant electric current by rear class, and this kind of design substantially increases production cost.
Utility model content
The purpose of this utility model is to provide a kind of high constant current accuracy LED drive circuit without stroboscopic, it improves the integrated level of drive circuit by the interior LED driver containing metal-oxide-semiconductor and feedback signal input terminal, only needs a LED driver can avoid LED stroboscopic problem.
In order to solve the problems of the technologies described above, the utility model provides a kind of high constant current accuracy LED drive circuit without stroboscopic, comprising: the interior LED driver containing metal-oxide-semiconductor and feedback signal input terminal, the energy-storage units be connected with this LED driver; Described energy-storage units is undertaken being coupled to obtain feedback signal by mutual inductance with a feedback loop, and this feedback signal inputs to described feedback signal input terminal by feedback branch.
Preferably, stroboscopic problem is solved in order to effectively utilize a driver further, described LED driver comprises: inductive current detection module, the PWM control module be connected with described metal-oxide-semiconductor, described inductive current detection module comprises: first, second integrated transporting discharging, wherein, be connected with the source electrode of metal-oxide-semiconductor after the end of oppisite phase of the first integrated transporting discharging is connected with the in-phase end of the second integrated transporting discharging, the in-phase end of described first integrated transporting discharging, the end of oppisite phase of the second integrated transporting discharging is used for inputting inductive current detection respectively and uses, lower threshold voltage, described first, the output of the second integrated transporting discharging is connected with the respective input of described PWM control module respectively, described PWM control module is suitable for the duty ratio of the pwm signal according to inductive current regulation output.
Preferably, in order to realize over-voltage protecting function, described LED driver also comprises: be suitable for the OVP module accessing described feedback signal, and the described feedback signal that described OVP module is suitable for according to obtaining judges whether output over-voltage protection signal;
Described PWM control module is connected with the output of described OVP module, is suitable for according to described overvoltage protection signal LED driver is locked.
Preferably, when realizing over-voltage protecting function, drive circuit is avoided to occur phenomenon of having the hiccups; Described OVP module comprises: three, the 4th integrated transporting discharging; The end of oppisite phase of described 3rd integrated transporting discharging accesses described feedback signal, and in-phase end accesses an overvoltage protection reference voltage, the output of the 3rd integrated transporting discharging is connected with the base stage of the first NPN type triode, the collector electrode of described first NPN type triode is connected with power supply by the first resistance, and grounded emitter; The collector electrode of described first NPN type triode is also connected with the in-phase end of the 4th integrated transporting discharging, the end of oppisite phase of the 4th integrated transporting discharging is connected with the in-phase end of described 3rd integrated transporting discharging, and the described output of the 4th integrated transporting discharging is connected with the base stage of the collector electrode of the second NPN type triode with the 3rd NPN type triode; Be connected by the emitter of the second resistance with the second NPN type triode after the base stage of described second NPN type triode is connected with the emitter of the 3rd NPN type triode; The emitter of described second NPN type triode is also connected with the input of described PWM control module as the output of described OVP module.
Preferably, the end of oppisite phase of described 3rd integrated transporting discharging is connected with feedback signal input terminal by the first modulate circuit.
Preferably, in order to realize compatible overheat protective function, described constant-current LED driver also comprises: temperature-sensitive module, and this temperature-sensitive module is connected with the end of oppisite phase of described 3rd integrated transporting discharging by the second modulate circuit; First, second modulate circuit structure described is identical, and comprises: be suitable for the series connection bleeder circuit accessing input voltage, the voltage follower be connected with this series connection bleeder circuit.
Technique scheme of the present utility model has the following advantages compared to existing technology: (1) the utility model improves the integrated level of drive circuit by the interior LED driver containing metal-oxide-semiconductor and feedback signal input terminal, only needs a LED driver can avoid LED stroboscopic problem; (2) by built-in over-voltage protective, the peripheral circuit of LED drive circuit is simplified more, better reliability; (3) this LED driver there will not be phenomenon of having the hiccups, when output voltage is higher than overvoltage protection reference voltage, directly locked, protects LED driver further.
Accompanying drawing explanation
In order to make content of the present utility model be more likely to be clearly understood, below basis specific embodiment and by reference to the accompanying drawings, the utility model is described in further detail, wherein
Fig. 1 is the circuit diagram of described high constant current accuracy LED drive circuit;
Fig. 2 is the theory diagram of described LED driver;
Fig. 3 is the theory diagram of described OVP module.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with embodiment also with reference to accompanying drawing, the utility model is further described.Should be appreciated that, these describe just exemplary, and do not really want to limit scope of the present utility model.In addition, in the following description, the description to known features and technology is eliminated, to avoid unnecessarily obscuring concept of the present utility model.
Fig. 1 shows the circuit diagram of described high constant current accuracy LED drive circuit.
As shown in Figure 1, a kind of high constant current accuracy LED drive circuit without stroboscopic, comprising:
The interior LED driver U1 containing metal-oxide-semiconductor and feedback signal input terminal, the energy-storage units be connected with this LED driver U1; Described energy-storage units is undertaken being coupled to obtain feedback signal by mutual inductance with a feedback loop, and this feedback signal inputs to described feedback signal input terminal ZCD by feedback branch.
Concrete, the pin of described LED driver U1: 1 pin NC holds (unsettled), 2 pin VCC hold (power supply), 3 pin feedback signal input terminal, 4 pin CS hold (source electrode of metal-oxide-semiconductor), 5 pin and 6 pin (metal-oxide-semiconductor drain electrode), 7 pin ground connection, 8 pin loop compensation pins.
Described energy-storage units comprises: continued flow tube D1, electric capacity C2, output resistance RL, the primary coil of mutual inductance T1, the negative electrode of described continued flow tube D1 is connected with one end of the positive pole of electric capacity C2, output resistance RL, and the other end of described output resistance RL is connected with the band point end of primary coil after being connected with the negative pole of electric capacity C2, the non-band point end of primary coil is connected with the anode of continued flow tube D1, this non-band point end also holds (5 pin and 6 pin) to be connected with the D of LED driver U1, the CS of LED driver U1 end (4 pin) is connected with resistance R3 ground connection afterwards.
Described feedback branch is specially: the secondary coil of described mutual inductance T1 obtains feedback signal by coupling, wherein, the band point end ground connection of secondary coil, non-band point end is connected with one end of resistance R5 with the anode of diode D2, the negative electrode of diode D2 is connected with the positive pole of electric capacity C3, and the other end of described resistance R5 is connected with described feedback signal input terminal ZCD (3 pin) with one end of resistance R4 respectively; The other end of resistance R4 is connected with the negative pole of electric capacity C3 and ground connection.
COM end (8 pin) of described LED driver U1 is by electric capacity C4 ground connection.
Band point end formation a pair Same Name of Ends of primary coil in described mutual inductance T1 and secondary coil.
Fig. 2 shows the theory diagram of described LED driver.
As shown in Figure 2, described LED driver comprises: inductive current detection module, the PWM control module be connected with described metal-oxide-semiconductor, described inductive current detection module comprises: first, second integrated transporting discharging, wherein, be connected with the source electrode of metal-oxide-semiconductor after the end of oppisite phase of the first integrated transporting discharging A1 is connected with the in-phase end of the second integrated transporting discharging A2, the in-phase end of described first integrated transporting discharging A1, the end of oppisite phase of the second integrated transporting discharging A2 is used for inputting inductive current detection respectively and uses, lower threshold voltage (VREF1, VREF2), described first, the output of the second integrated transporting discharging is connected with the respective input of described PWM control module respectively, described PWM control module is suitable for the duty ratio of the pwm signal according to inductive current regulation output.
Wherein, described PWM control module can adopt microprocessor controller to realize, such as, adopt the STM8S Series MCU of ST company to realize.
Described LED driver also comprises: be suitable for the OVP module accessing described feedback signal, and the described feedback signal that described OVP module is suitable for according to obtaining judges whether output over-voltage protection signal; Described PWM control module is connected with the output of described OVP module, is suitable for according to described overvoltage protection signal LED driver is locked.
Optionally, described feedback signal is also suitable for access zero passage detection module, and the output of this zero passage detection module is also connected with the respective input of described PWM control module.
Fig. 3 shows the theory diagram of described OVP module.
As shown in Figure 3, described OVP module comprises: three, the 4th integrated transporting discharging; The end of oppisite phase of described 3rd integrated transporting discharging A3 accesses described feedback signal, and in-phase end accesses an overvoltage protection reference voltage V REF ', the output of the 3rd integrated transporting discharging A3 is connected with the base stage of the first NPN type triode T1, the collector electrode of described first NPN type triode T1 is connected with power supply by the first resistance R1 ', and grounded emitter; The collector electrode of described first NPN type triode T1 is also connected with the in-phase end of the 4th integrated transporting discharging A4, the end of oppisite phase of the 4th integrated transporting discharging A4 is connected with the in-phase end of described 3rd integrated transporting discharging A3, and the described output of the 4th integrated transporting discharging A4 is connected with the base stage of the collector electrode of the second NPN type triode T2 with the 3rd NPN type triode T3; The base stage of described second NPN type triode T2 is connected with the emitter of the 3rd NPN type triode T3 and is connected with the emitter of the second NPN type triode T2 by the second resistance R2 ' afterwards; The emitter of described second NPN type triode T2 is also connected with the input of described PWM control module as the output of described OVP module.
The end of oppisite phase of described 3rd integrated transporting discharging A3 is connected with feedback signal input terminal ZCD by the first modulate circuit.
Described constant-current LED driver also comprises: temperature-sensitive module, and this temperature-sensitive module is connected with the end of oppisite phase of described 3rd integrated transporting discharging A3 by the second modulate circuit; First, second modulate circuit structure described is identical, and comprises: be suitable for the series connection bleeder circuit accessing input voltage, the voltage follower be connected with this series connection bleeder circuit.Optionally, described temperature-sensitive module can be, but not limited to the temperature sensing device adopting thermistor.
Should be understood that, above-mentioned embodiment of the present utility model only for exemplary illustration or explain principle of the present utility model, and is not formed restriction of the present utility model.Therefore, any amendment made when not departing from spirit and scope of the present utility model, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.In addition, the utility model claims be intended to contain fall into claims scope and border or this scope and border equivalents in whole change and modification.
Claims (6)
1., without a high constant current accuracy LED drive circuit for stroboscopic, it is characterized in that, comprising:
The interior LED driver containing metal-oxide-semiconductor and feedback signal input terminal, the energy-storage units be connected with this LED driver;
Described energy-storage units is undertaken being coupled to obtain feedback signal by mutual inductance with a feedback loop, and this feedback signal inputs to described feedback signal input terminal by feedback branch.
2. high constant current accuracy LED drive circuit according to claim 1, it is characterized in that, described LED driver comprises: inductive current detection module, the PWM control module be connected with described metal-oxide-semiconductor,
Described inductive current detection module comprises: first, second integrated transporting discharging, wherein, be connected with the source electrode of metal-oxide-semiconductor after the end of oppisite phase of the first integrated transporting discharging is connected with the in-phase end of the second integrated transporting discharging, inductive current detection is used, lower threshold voltage for inputting respectively for the in-phase end of described first integrated transporting discharging, the end of oppisite phase of the second integrated transporting discharging, and the output of first, second integrated transporting discharging described is connected with the respective input of described PWM control module respectively;
Described PWM control module is suitable for the duty ratio of the pwm signal according to inductive current regulation output.
3. high constant current accuracy LED drive circuit according to claim 2, it is characterized in that, described LED driver also comprises: be suitable for the OVP module accessing described feedback signal, and the described feedback signal that described OVP module is suitable for according to obtaining judges whether output over-voltage protection signal;
Described PWM control module is connected with the output of described OVP module, is suitable for according to described overvoltage protection signal LED driver is locked.
4. high constant current accuracy LED drive circuit according to claim 3, is characterized in that, described OVP module comprises: three, the 4th integrated transporting discharging;
The end of oppisite phase of described 3rd integrated transporting discharging accesses described feedback signal, and in-phase end accesses an overvoltage protection reference voltage, the output of the 3rd integrated transporting discharging is connected with the base stage of the first NPN type triode, the collector electrode of described first NPN type triode is connected with power supply by the first resistance, and grounded emitter;
The collector electrode of described first NPN type triode is also connected with the in-phase end of the 4th integrated transporting discharging, the end of oppisite phase of the 4th integrated transporting discharging is connected with the in-phase end of described 3rd integrated transporting discharging, and the described output of the 4th integrated transporting discharging is connected with the base stage of the collector electrode of the second NPN type triode with the 3rd NPN type triode;
Be connected by the emitter of the second resistance with the second NPN type triode after the base stage of described second NPN type triode is connected with the emitter of the 3rd NPN type triode;
The emitter of described second NPN type triode is also connected with the input of described PWM control module as the output of described OVP module.
5. high constant current accuracy LED drive circuit according to claim 4, is characterized in that, the end of oppisite phase of described 3rd integrated transporting discharging is connected with feedback signal input terminal by the first modulate circuit.
6. high constant current accuracy LED drive circuit according to claim 5, it is characterized in that, described constant-current LED driver also comprises: temperature-sensitive module, and this temperature-sensitive module is connected with the end of oppisite phase of described 3rd integrated transporting discharging by the second modulate circuit;
First, second modulate circuit structure described is identical, and comprises: be suitable for the series connection bleeder circuit accessing input voltage, the voltage follower be connected with this series connection bleeder circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420524626.8U CN204119605U (en) | 2014-09-12 | 2014-09-12 | Without the high constant current accuracy LED drive circuit of stroboscopic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420524626.8U CN204119605U (en) | 2014-09-12 | 2014-09-12 | Without the high constant current accuracy LED drive circuit of stroboscopic |
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| Publication Number | Publication Date |
|---|---|
| CN204119605U true CN204119605U (en) | 2015-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420524626.8U Expired - Fee Related CN204119605U (en) | 2014-09-12 | 2014-09-12 | Without the high constant current accuracy LED drive circuit of stroboscopic |
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| CN (1) | CN204119605U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104202884A (en) * | 2014-09-12 | 2014-12-10 | 常州顶芯半导体技术有限公司 | Stroboflash-free high-precision constant-current LED (light emitting diode) drive circuit and operating method thereof |
| CN111901922A (en) * | 2019-05-06 | 2020-11-06 | 东贝光电科技股份有限公司 | Non-stroboscopic linear LED drive circuit |
-
2014
- 2014-09-12 CN CN201420524626.8U patent/CN204119605U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104202884A (en) * | 2014-09-12 | 2014-12-10 | 常州顶芯半导体技术有限公司 | Stroboflash-free high-precision constant-current LED (light emitting diode) drive circuit and operating method thereof |
| CN111901922A (en) * | 2019-05-06 | 2020-11-06 | 东贝光电科技股份有限公司 | Non-stroboscopic linear LED drive circuit |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150121 Termination date: 20200912 |