CN204362370U - A kind of LED drive circuit - Google Patents
A kind of LED drive circuit Download PDFInfo
- Publication number
- CN204362370U CN204362370U CN201420830877.9U CN201420830877U CN204362370U CN 204362370 U CN204362370 U CN 204362370U CN 201420830877 U CN201420830877 U CN 201420830877U CN 204362370 U CN204362370 U CN 204362370U
- Authority
- CN
- China
- Prior art keywords
- circuit
- voltage
- photoelectric coupled
- feedback
- triode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The utility model discloses a kind of LED drive circuit, comprise voltage stabilizing circuit, transforming circuit, the first photoelectric coupled circuit, the second photoelectric coupled circuit, feedback circuit and comparator; First photoelectric coupled circuit samples output voltage and to the input Drazin inverse voltage of feedback circuit, to adjust the feedback voltage that feedback circuit exports, the parameter of feedback voltage to transforming circuit adjusts, to adjust the power output of transforming circuit; One dimmer inputs dimmer voltage to comparator, through comparator circuit to the sampling rate of output voltage and dimmer voltage comparatively after export a regulation voltage, regulation voltage drives the second photoelectric coupled circuit, voltage stabilizing circuit and a switching circuit are electrically connected, and pass through the break-make of the second photoelectric coupled circuit driving switch circuit, thus realize the Kai Heguan to feedback circuit.The utility model circuit structure is simple, and the control of load current is stable and reliable.
Description
Technical field
The utility model relates to LED Driving technique field, particularly a kind of LED drive circuit.
Background technology
Current light-emitting diodes pipe driving chip can be divided into by type: constant pressure type driving chip, constant current mode driving chip and pulsed drive chip.Wherein constant pressure type driving chip is exactly generally that our common DC/DC boost chip is in the majority.The advantage of this scheme is that chip cost does not cheaply have complicated peripheral circuit.But can only constant voltage driving LED circuital current uncontrollable when will cause driver output.The consistency of LED luminance cannot be ensured.
The uncontrollable problem of electric current that before constant current mode driving chip then solves, constant pressure type drives.Current reasonable constant current chip can accomplish the constant current accuracy of about 1%, and has easy peripheral control interface can arrange the required size of current exported flexibly so be favourably welcome.But this kind of chip price is more much higher than constant voltage chip price and peripheral circuit is complicated.Simultaneously because constant output current is so the electric discharge when battery is as power supply of whole chip can than comparatively fast.
Current pulsed drive chip is powered to LED with high-frequency pulse generator output interface.Because be that pulse signal frequency is very high so human eye cannot feel the stroboscopic of LED at all, not only institute has met vision needs but also effectively saved electric energy output on the one hand in this way.And the operating frequency of this type chip generally can be controlled by external interface.But the frequency of the type chip concussion is at present generally in 100KHz ~ 500KHz scope.So current driving force is only applicable to low-power applications.But believe the occasion that can rise to great power LED in the near future and drive.
But due to the problem of cost control etc., still can there is the problem of Current Control instability in the driver of part, can crash when easily there is heat engine switch LED load because of current over pulse.
Utility model content
The technical problems to be solved in the utility model is for above-mentioned the deficiencies in the prior art, provides a kind of LED drive circuit, and this driving circuit structure is simple, and the control of load current is stable and reliable.
For solving the problems of the technologies described above, technical solution adopted in the utility model is: a kind of LED drive circuit, comprises voltage stabilizing circuit, transforming circuit, the first photoelectric coupled circuit, the second photoelectric coupled circuit, feedback circuit and comparator; Power supply converts required output voltage to through transforming circuit, and power supply is through the voltage of the backward described feedback circuit stable output of voltage stabilizing circuit voltage stabilizing, and output voltage connects load; First photoelectric coupled circuit samples output voltage and to the input Drazin inverse voltage of described feedback circuit, to adjust the feedback voltage that described feedback circuit exports, the parameter of feedback voltage to described transforming circuit adjusts, to adjust the power output of transforming circuit; One dimmer is to described comparator input dimmer voltage, through described comparator circuit to the sampling rate of output voltage and dimmer voltage comparatively after export a regulation voltage, regulation voltage drives the second photoelectric coupled circuit, described voltage stabilizing circuit and a switching circuit are electrically connected, and by the break-make of described second photoelectric coupled circuit driving switch circuit, thus realize the Kai Heguan to feedback circuit.
In technique scheme, the primary side of described transforming circuit is parallel with the first filter circuit, described first filter circuit comprises electric capacity C5, resistance R9, diode Z1 and diode D1, connects after wherein said electric capacity C5, resistance R9 and diode Z1 parallel connection with described diode D2; The secondary end of described transforming circuit is parallel with the second filter circuit, described second filter circuit comprises electric capacity C4, resistance R8, diode D1 and electric capacity C6, wherein said diode D1 and electric capacity C6 connects, and described electric capacity C4 and resistance R8 is in parallel with diode D1 again after connecting.
In technique scheme, described first photoelectric coupled circuit comprises transmitting terminal U3B and receiving terminal U3A, and described second photoelectric coupled circuit comprises transmitting terminal U1B and receiving terminal U1A.
In technique scheme, described feedback circuit comprises controller 3843, one end of described receiving terminal U3A and the comp of described controller hold and are electrically connected, the other end ground connection of described receiving terminal U3A, a two ends electric capacity C7 in parallel of described receiving terminal U3A, the GATE end of described controller is electrically connected with the primary side of described transforming circuit.
In technique scheme, described comparator circuit adopts LM393, comparator circuit samples the described output voltage be carried in load and the dimmer voltage exported with described dimmer compares, and Drazin inverse voltage is to the transmitting terminal U1B of the second photoelectric coupled circuit.
In technique scheme, described switching circuit comprises NPN triode Q1 and PNP triode Q2, the E end of described triode Q1 is held with the E of triode Q2 and is electrically connected, the C end of described triode Q1 is electrically connected with the output of described voltage stabilizing circuit, the C end of described triode Q1 and triode Q2 is electrically connected with one end of the receiving terminal U1A of described second photoelectric coupled circuit respectively, and the C end of the Q1 of described triode is electrically connected with the other end of described receiving terminal U1A; E end input connection one driving voltage of described triode Q2.
The beneficial effects of the utility model are: by the sampling of photoelectric coupled circuit to integrated circuit, feed back in circuit itself, can play good Current Control effect, can prevent the phenomenon of current over pulse.
Accompanying drawing explanation
Fig. 1 is integrated circuit structural representation of the present utility model;
Fig. 2 is the electrical block diagram of first half in Fig. 1;
Fig. 3 is the electrical block diagram of latter half in Fig. 1.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
As shown in Figure 1, 2, 3, a kind of LED drive circuit, comprises voltage stabilizing circuit, transforming circuit, the first photoelectric coupled circuit, the second photoelectric coupled circuit, feedback circuit and comparator; Power supply converts required output voltage to through transforming circuit, and power supply is through the voltage of the backward described feedback circuit stable output of voltage stabilizing circuit voltage stabilizing, and output voltage connects load; First photoelectric coupled circuit samples output voltage and to the input Drazin inverse voltage of described feedback circuit, to adjust the feedback voltage that described feedback circuit exports, the parameter of feedback voltage to described transforming circuit adjusts, to adjust the power output of transforming circuit; One dimmer is to described comparator input dimmer voltage, through described comparator circuit to the sampling rate of output voltage and dimmer voltage comparatively after export a regulation voltage, regulation voltage drives the second photoelectric coupled circuit, described voltage stabilizing circuit and a switching circuit are electrically connected, and by the break-make of described second photoelectric coupled circuit driving switch circuit, thus realize the Kai Heguan to feedback circuit.The dimmer voltage of dimmer input gets 1-10, and so the duty ratio of feedback circuit can be taken as 1-100%.Power acquisition 12/24DC, the voltage after transformation is 12DC.
Wherein, power supply is inputted by power input DC+ and power input DC-, power input DC-ground connection.
Wherein, the primary side of described transforming circuit is parallel with the first filter circuit, and described first filter circuit comprises electric capacity C5, resistance R9, diode Z1 and diode D1, connects after wherein said electric capacity C5, resistance R9 and diode Z1 parallel connection with described diode D2; The secondary end of described transforming circuit is parallel with the second filter circuit, described second filter circuit comprises electric capacity C4, resistance R8, diode D1 and electric capacity C6, wherein said diode D1 and electric capacity C6 connects, and described electric capacity C4 and resistance R8 is in parallel with diode D1 again after connecting.Transforming circuit adopts EE13 chip, the pin two of two termination EE13 chips of the first filter circuit and pin 3, the pin 8 of two termination EE13 chips of the first filter circuit and pin 6, pin 6 ground connection, electromotive force between diode D1 and electric capacity C6 is input load electromotive force, namely load voltage output.
Wherein, described first photoelectric coupled circuit comprises transmitting terminal U3B and receiving terminal U3A, and described second photoelectric coupled circuit comprises transmitting terminal U1B and receiving terminal U1A.In first photoelectric coupled circuit, connect after a resistance R13 and be electrically connected between diode D1 and electric capacity C6 in one end of transmitting terminal U3B, and the other end is connected and is electrically connected at the pin 6 of transforming circuit after a voltage stabilizing chip U4, and this voltage stabilizing chip U4 adopts TL431.Intermediate point between transmitting terminal U3B and voltage stabilizing chip U4 and the intermediate point between diode D1 and electric capacity C6 are in series with resistance R14 resistance R15 and electric capacity C10, the intermediate point of one end of one resistance R16 respectively and between the negative electrode of voltage stabilizing chip U4 and resistance R14 and R15 is electrically connected, the other end ground connection of resistance R16.Load voltage output is connected to by a resistance R12 after the positive pole of the transmitting terminal U1B in the second photoelectric coupled circuit and the output of comparator are electrically connected.
Wherein, described feedback circuit comprises controller 3843, one end of described receiving terminal U3A and the comp of described controller hold and are electrically connected, the other end ground connection of described receiving terminal U3A, a two ends electric capacity C7 in parallel of described receiving terminal U3A, the GATE end of described controller is electrically connected with the primary side of described transforming circuit.The GND end of controller, FB holds direct ground connection, and RTCT holds ground connection after series connection one electric capacity C9, and RTCT end and VRET hold connect a resistance R10, VRET to hold ground connection after series connection one electric capacity C8, ground connection after CS end series connection one electric capacity C3.GATE is connected to the G pole of a field effect transistor Q3 after holding series connection one resistance R3, the D pole of field effect transistor Q3 is connected with the pin 3 of transformation chip, the D pole of this field effect transistor Q3 and power input DC+ are in series with ground connection after the S pole series resistance R6 of electric capacity C1 and resistance R2, field effect transistor Q3.
Wherein, described comparator circuit adopts LM393, and comparator circuit samples the described output voltage be carried in load and the dimmer voltage exported with described dimmer compares, and Drazin inverse voltage is to the transmitting terminal U1B of the second photoelectric coupled circuit.
Wherein, described switching circuit comprises NPN triode Q1 and PNP triode Q2, the E end of described triode Q1 is held with the E of triode Q2 and is electrically connected, the C end of described triode Q1 is electrically connected with the output of described voltage stabilizing circuit, the C end of described triode Q1 and triode Q2 is electrically connected with one end of the receiving terminal U1A of described second photoelectric coupled circuit respectively, and the C end of the Q1 of described triode is electrically connected with the other end of described receiving terminal U1A; The E end input connection one driving voltage PWM of described triode Q2.
Above embodiment is just to illustrate instead of restriction the utility model, therefore all equivalences done according to the method described in the utility model patent claim change or modify, and are included in the utility model patent claim.
Claims (6)
1. a LED drive circuit, is characterized in that: comprise voltage stabilizing circuit, transforming circuit, the first photoelectric coupled circuit, the second photoelectric coupled circuit, feedback circuit and comparator; Power supply converts required output voltage to through transforming circuit, and power supply is through the voltage of the backward described feedback circuit stable output of voltage stabilizing circuit voltage stabilizing, and output voltage connects load; First photoelectric coupled circuit samples output voltage and to the input Drazin inverse voltage of described feedback circuit, to adjust the feedback voltage that described feedback circuit exports, the parameter of feedback voltage to described transforming circuit adjusts, to adjust the power output of transforming circuit; One dimmer is to described comparator input dimmer voltage, through described comparator circuit to the sampling rate of output voltage and dimmer voltage comparatively after export a regulation voltage, regulation voltage drives the second photoelectric coupled circuit, described voltage stabilizing circuit and a switching circuit are electrically connected, and by the break-make of described second photoelectric coupled circuit driving switch circuit, thus realize the Kai Heguan to feedback circuit.
2. a kind of LED drive circuit according to claim 1, it is characterized in that: the primary side of described transforming circuit is parallel with the first filter circuit, described first filter circuit comprises electric capacity C5, resistance R9, diode Z1 and diode D1, connects after wherein said electric capacity C5, resistance R9 and diode Z1 parallel connection with described diode D2; The secondary end of described transforming circuit is parallel with the second filter circuit, described second filter circuit comprises electric capacity C4, resistance R8, diode D1 and electric capacity C6, wherein said diode D1 and electric capacity C6 connects, and described electric capacity C4 and resistance R8 is in parallel with diode D1 again after connecting.
3. a kind of LED drive circuit according to claim 1, is characterized in that: described first photoelectric coupled circuit comprises transmitting terminal U3B and receiving terminal U3A, and described second photoelectric coupled circuit comprises transmitting terminal U1B and receiving terminal U1A.
4. a kind of LED drive circuit according to claim 3, it is characterized in that: described feedback circuit comprises controller 3843, one end of described receiving terminal U3A and the comp of described controller hold and are electrically connected, the other end ground connection of described receiving terminal U3A, a two ends electric capacity C7 in parallel of described receiving terminal U3A, the GATE end of described controller is electrically connected with the primary side of described transforming circuit.
5. a kind of LED drive circuit according to claim 3, it is characterized in that: described comparator circuit adopts LM393, comparator circuit samples the described output voltage be carried in load and the dimmer voltage exported with described dimmer compares, and Drazin inverse voltage is to the transmitting terminal U1B of the second photoelectric coupled circuit.
6. a kind of LED drive circuit according to claim 3, it is characterized in that: described switching circuit comprises NPN triode Q1 and PNP triode Q2, the E end of described triode Q1 is held with the E of triode Q2 and is electrically connected, the C end of described triode Q1 is electrically connected with the output of described voltage stabilizing circuit, the C end of described triode Q1 and triode Q2 is electrically connected with one end of the receiving terminal U1A of described second photoelectric coupled circuit respectively, and the C end of the Q1 of described triode is electrically connected with the other end of described receiving terminal U1A; E end input connection one driving voltage of described triode Q2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420830877.9U CN204362370U (en) | 2014-12-25 | 2014-12-25 | A kind of LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420830877.9U CN204362370U (en) | 2014-12-25 | 2014-12-25 | A kind of LED drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204362370U true CN204362370U (en) | 2015-05-27 |
Family
ID=53263813
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420830877.9U Active CN204362370U (en) | 2014-12-25 | 2014-12-25 | A kind of LED drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204362370U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104902646A (en) * | 2014-11-28 | 2015-09-09 | 成都冠深科技有限公司 | Life raft energy-saving system based on constant-current protection |
| WO2019178896A1 (en) * | 2018-03-22 | 2019-09-26 | 深圳市博为光电股份有限公司 | Led optical communication power supply driving system |
-
2014
- 2014-12-25 CN CN201420830877.9U patent/CN204362370U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104902646A (en) * | 2014-11-28 | 2015-09-09 | 成都冠深科技有限公司 | Life raft energy-saving system based on constant-current protection |
| WO2019178896A1 (en) * | 2018-03-22 | 2019-09-26 | 深圳市博为光电股份有限公司 | Led optical communication power supply driving system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102762011B (en) | LED (Light Emitting Diode) constant-current dimming drive circuit device | |
| CN102105007B (en) | LED constant-current driver with boosting function | |
| CN104768265A (en) | High-power LED constant-current driving circuit | |
| CN103813595A (en) | Efficient power source capable of supplying electricity in constant voltage and constant current alternation mode | |
| CN205160405U (en) | Drive and control circuit and have piezoelectricity injection valve of this circuit | |
| CN203674082U (en) | Relay control circuit | |
| CN107659160A (en) | A kind of DC DC constant-current circuits | |
| CN103899427A (en) | Driving circuit of high pressure common rail oil atomizer | |
| CN204362370U (en) | A kind of LED drive circuit | |
| CN201937925U (en) | LED constant current driver with function of voltage reduction | |
| CN103796389B (en) | High-high brightness hoisting module, controllable silicon light modulation LED drive circuit and system | |
| CN201731275U (en) | Intelligent light-adjusting flashlight capable of adjusting light intensity | |
| CN204205959U (en) | A kind of DC-DC power source converter circuit | |
| CN101656506A (en) | Motor driving system | |
| CN204425713U (en) | Brightness is regulated and the control circuit exported with USB in energy-saving LED lamp | |
| CN205092770U (en) | Power management circuit that steps up | |
| CN113489120A (en) | Intelligent charging circuit and intelligent charging method | |
| CN204110363U (en) | With the Electric aircraft of voltage conversion device | |
| CN201590674U (en) | Intelligent boost-buck charging device | |
| CN206206741U (en) | A kind of adjustable Chopper driving circuit of energy-saving current | |
| CN215912036U (en) | Direct current power supply control device | |
| CN204517448U (en) | aircraft battery controller | |
| CN202405845U (en) | Switch-type constant-current constant-voltage control circuit | |
| CN204559421U (en) | A kind of step-down controller circuit for intelligent electric meter | |
| CN204761276U (en) | A switching power supply for converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: No. 253, Hengli Junma Road, Hengli Town, Dongguan, Guangdong 523460 Patentee after: Guangdong Qingzhou Photoelectric Technology Co.,Ltd. Address before: 523000 The third floor of the factory building in Xinsi Village, Hengli Town, Dongguan City, Guangdong Province Patentee before: LETARON ELECTRONIC CO.,LTD. |
|
| CP03 | Change of name, title or address |