CN201919204U - LED (light-emitting diode) drive circuit - Google Patents
LED (light-emitting diode) drive circuit Download PDFInfo
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- CN201919204U CN201919204U CN2010206162007U CN201020616200U CN201919204U CN 201919204 U CN201919204 U CN 201919204U CN 2010206162007 U CN2010206162007 U CN 2010206162007U CN 201020616200 U CN201020616200 U CN 201020616200U CN 201919204 U CN201919204 U CN 201919204U
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Abstract
The utility model relates to an LED (light-emitting diode) drive circuit which comprises a drive control circuit, a rectification filter circuit connected with the input end of the drive control circuit, an output rectification filter circuit connected with the output end of the drive control circuit, a PWM (pulse-width modulation) control circuit connected with the rectification filter circuit, and a constant current and constant voltage loop control circuit connected with the output rectification filter circuit. As the LED drive circuit adopts reasonable circuit equipment, a highly integrated chip U1 of the PWM control circuit which is mainly composed of a current mode controller and a 700V MOSFET (metal-oxide-semiconductor field effect transistor) integrates the power switching tube function and various protective functions of the PWM control circuit so as to be convenient to form wide voltage input, wherein the model of the chip U1 is NCP 1014; therefore, the regulating performance of the circuit and the utilization efficiency of the electric energy are improved. Compared with the existing homogeneous circuit, the LED drive circuit has the beneficial technical effects of simple structure, low cost and small volume.
Description
[technical field]
The utility model relates to a kind of circuit, specifically is a kind of led drive circuit that is used for field of light fittings.
[background technology]
Along with day by day badly changing of energy crisis, greenhouse effect and the biological environment of current society, make people to energy obtain manner, improve energy utilization rate and become the common recognition that the whole world is paid close attention to.Along with the continuous development of LED technology, the led drive circuit that is arranged in the LED technology is more and more.Yet, because major part all is to adopt the single resistance current-limiting drive circuit or the pattern of constant voltage drive circuit to drive in the available circuit; When being transfused to voltage fluctuation, the electric current in the LED lamp that passes through causes its adjusting function poor also along with variation.Consume certain power easily owing to be arranged at the current-limiting resistance of resistance current-limiting drive circuit or constant voltage drive circuit again, cause the utilization ratio of its electric energy low.
[utility model content]
Technical purpose of the present utility model is to provide a kind of adjusting function of its circuit and utilization ratio of electric energy of not only can improving in order to solve the problem that above-mentioned prior art exists, but also have simple in structure, the led drive circuit that cost is low.
In order to solve the problems of the technologies described above, and the utility model provides a kind of led drive circuit, and it comprises Drive and Control Circuit, be connected in current rectifying and wave filtering circuit on the Drive and Control Circuit input, be connected in output rectifier and filter on the Drive and Control Circuit output, be connected in pwm control circuit on the current rectifying and wave filtering circuit, be connected in the constant current constant voltage loop control circuit on the output rectifier and filter.
According to above-mentioned major technique feature, described Drive and Control Circuit comprises and is used to control the switch transformer T1 of voltage transformation and isolation and is connected in capacitor C Y1 on the switch transformer T1.
According to above-mentioned major technique feature, the diode D1 on the total end that described current rectifying and wave filtering circuit comprises the capacitor C that is connected in parallel 2 and the resistance R 1 that are connected on the switch transformer T1 input, be connected in capacitor C 2 and resistance R 1 common junction, be connected in capacitor C 2 and resistance R 1 common junction another have the rectifier bridge BD1 on holding and be connected in rectifier bridge BD1 and capacitor C 2 and resistance R 1 common junction between capacitor C 1.
According to above-mentioned major technique feature, described output rectifier and filter comprises the diode D2 that is connected in parallel, the diode D3 that are connected on the switch transformer T1 output, be connected in the capacitor C that is connected 3 parallel with one another, the capacitor C 6 on the total end of diode D2 and diode D3 junction and be connected in capacitor C 3 and the total end of capacitor C 6 junctions on the resistance R that is connected 3 parallel with one another, resistance R 4.
According to above-mentioned major technique feature, described constant current constant voltage loop control circuit comprises optical coupler U2A, the voltage stabilizing didoe ZD1 that is connected in capacitor C 3 and capacitor C 6 two ends and is connected in optical coupler U2A and the resistance R 7 of the total end of voltage stabilizing didoe ZD1 junction.
According to above-mentioned major technique feature, described pwm control circuit comprises the chip U1 that is connected on the current rectifying and wave filtering circuit, be connected to capacitor C 4, capacitor C 5 on the chip U, be connected in the optical coupler U2A on the chip U and be connected in capacitor C Y1 on the optical coupler U2A.
According to above-mentioned major technique feature, described chip U1 is made of chip NCP1014
Useful technique effect of the present utility model: because of described led drive circuit adopts rational circuit arrangement; make the chip U1 of pwm control circuit; this chip U1 mainly is that the high integrated model that is made of the MOSFET of the current mode controller of a fixed frequency and a 700V is that NCP1014 constitutes; make the various defencive functions of its integrated power switch pipe function and pwm control circuit; the wide voltage input that is convenient to constitute, thus reach the adjusting function of its circuit of raising and the utilization ratio of electric energy.Compare the useful technique effect that the utility model also has is simple in structure, cost is low and volume is little mutually with existing homogeneous circuit.
Below in conjunction with drawings and Examples, the technical solution of the utility model is described in further detail.
[description of drawings]
Fig. 1 is the schematic diagram of led drive circuit in the utility model.
[embodiment]
Please refer to shown in Figure 1ly, below in conjunction with concrete a kind of led drive circuit of implementation in the utility model, it comprises Drive and Control Circuit, current rectifying and wave filtering circuit, output rectifier and filter, pwm control circuit and constant current constant voltage loop control circuit.
Described Drive and Control Circuit comprises and is used to control the switch transformer T1 of voltage transformation and isolation and is connected in capacitor C Y1 on the switch transformer T1.
Described current rectifying and wave filtering circuit comprises the capacitor C that is connected in parallel 2 and the resistance R 1 that are connected on the switch transformer T1 input, be connected in diode D1 on the total end of capacitor C 2 and resistance R 1 common junction, be connected in the rectifier bridge BD1 on another total end of capacitor C 2 and resistance R 1 common junction and be connected in rectifier bridge BD1 and capacitor C 2 and resistance R 1 common junction between capacitor C 1.
Described output rectifier and filter comprises the diode D2 that is connected in parallel, the diode D3 that are connected on the switch transformer T1 output, be connected in the capacitor C that is connected 3 parallel with one another, the capacitor C 6 on the total end of diode D2 and diode D3 junction and be connected in capacitor C 3 and the total end of capacitor C 6 junctions on the resistance R that is connected 3 parallel with one another, resistance R 4.
Described constant current constant voltage loop control circuit comprises optical coupler U2A, the voltage stabilizing didoe ZD1 that is connected in capacitor C 3 and capacitor C 6 two ends and is connected in optical coupler U2A and the resistance R 7 of the total end of voltage stabilizing didoe ZD1 junction.By adjusting and the limiting resistance of VCC series connection, can realize over-voltage protecting function, exclusive circuit when optical coupler U2 damage or feedback loop go wrong.
Described pwm control circuit comprises the chip U1 that is connected on the current rectifying and wave filtering circuit, be connected to capacitor C 4, capacitor C 5 on the chip U, be connected in the optical coupler U2A on the chip U and be connected in capacitor C Y1 on the optical coupler U2A.Described chip U1 is made of chip NCP1014.
Described current rectifying and wave filtering circuit is connected on the input of Drive and Control Circuit, and described output rectifier and filter is connected on the Drive and Control Circuit output, described pwm control circuit is connected on the current rectifying and wave filtering circuit, and described crossing current constant voltage loop control circuit is connected on the output rectifier and filter.
Described current rectifying and wave filtering circuit mainly is that the AC power of input is rectified into level and smooth DC power supply.Described pwm control circuit is made up of the chip U1 of model NCP1014; the current mode controller of a fixed frequency that this chip U1 is integrated and the MOSFET of a 700V; can provide structure reliable for led drive circuit; purpose cheaply; described led drive circuit comprises soft start; frequency jitter; short-circuit protection; skip cycle mode; peak inrush current is adjusted and dynamic self-powered (need not ancillary coil); when the electric current adjusted value drops to below the set point; chip U1 can enter the skip-cycle pattern automatically, thereby outstanding efficient is provided under lighter load.When feedback signal weakens, for example be short-circuited or optical coupler U2A or optical coupler U2B when damaging, can carry out short-circuit detecting, the voltage by drop-down feedback pin or make it through a SCR ground connection to latch fully, can realize outside forbidding.The quantity of peripheral component has further been simplified in soft start and frequency jitter, to realize low cost, highly reliable purpose.
Described switch transformer T1 has finished the conversion of voltage and the effect of isolation.Described diode D2, diode D3, capacitor C 3, capacitor C 6 are formed output rectifier and filter.Described constant current constant voltage loop control circuit is made up of optical coupler U2, resistance R 3, resistance R 4, resistance R 7, capacitor C 4, voltage stabilizing didoe ZD1; by the limiting resistance of adjusting and VCC connects; can realize over-voltage protecting function, damage or feedback loop exclusive circuit when going wrong at optical coupler U2.
When having the alternating current process fuse F1 of big surge; fuse F1 orders about capacitor C Y1 and filters common mode interference signal to reach the purpose of effective protective circuit, the requirement that also has overheat protector, overcurrent protection, overvoltage protection, open-circuit-protection, short-circuit protection simultaneously and be fit to very much require system effectiveness height and good stability.Therefore, reach the whole LED drive circuit and have crossing current, high efficiency, simple in structure and characteristics that integrated cost is low.Low and volume is little because of having cost again, relatively be suitable for production in batches.
In sum; because of described led drive circuit adopts rational circuit arrangement; make the chip U1 of pwm control circuit; this chip U1 mainly is that the high integrated model that is made of the MOSFET of the current mode controller of a fixed frequency and a 700V is that NCP1014 constitutes; make the various defencive functions of its integrated power switch pipe function and pwm control circuit; the wide voltage input that is convenient to constitute, thus reach the adjusting function of its circuit of raising and the utilization ratio of electric energy.Compare the useful technique effect that the utility model also has is simple in structure, cost is low and volume is little mutually with existing homogeneous circuit.
Claims (7)
1. led drive circuit, it comprises Drive and Control Circuit, be connected in current rectifying and wave filtering circuit on the Drive and Control Circuit input, be connected in output rectifier and filter on the Drive and Control Circuit output, be connected in pwm control circuit on the current rectifying and wave filtering circuit, be connected in the constant current constant voltage loop control circuit on the output rectifier and filter.
2. led drive circuit according to claim 1 is characterized in that: described Drive and Control Circuit comprises and is used to control the switch transformer T1 of voltage transformation and isolation and is connected in capacitor C Y1 on the switch transformer T1.
3. led drive circuit according to claim 1 is characterized in that: described current rectifying and wave filtering circuit comprises the capacitor C that is connected in parallel 2 and the resistance R 1 that are connected on the switch transformer T1 input, be connected in diode D1 on the total end of capacitor C 2 and resistance R 1 common junction, be connected in the rectifier bridge BD1 on another total end of capacitor C 2 and resistance R 1 common junction and be connected in rectifier bridge BD1 and capacitor C 2 and resistance R 1 common junction between capacitor C 1.
4. led drive circuit according to claim 1 is characterized in that: described output rectifier and filter comprises the diode D2 that is connected in parallel, the diode D3 that are connected on the switch transformer T1 output, be connected in the capacitor C that is connected 3 parallel with one another, the capacitor C 6 on the total end of diode D2 and diode D3 junction and be connected in capacitor C 3 and the total end of capacitor C 6 junctions on the resistance R that is connected 3 parallel with one another, resistance R 4.
5. led drive circuit according to claim 1 is characterized in that: described constant current constant voltage loop control circuit comprises optical coupler U2A, the voltage stabilizing didoe ZD1 that is connected in capacitor C 3 and capacitor C 6 two ends and is connected in optical coupler U2A and the resistance R 7 of the total end of voltage stabilizing didoe ZD1 junction.
6.
Led drive circuit according to claim 1 is characterized in that: described pwm control circuit comprises the chip U1 that is connected on the current rectifying and wave filtering circuit, be connected to capacitor C 4, capacitor C 5 on the chip U, be connected in the optical coupler U2A on the chip U and be connected in capacitor C Y1 on the optical coupler U2A.
7.
Led drive circuit according to claim 7 is characterized in that: described chip U1 is made of chip NCP1014.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206162007U CN201919204U (en) | 2010-11-19 | 2010-11-19 | LED (light-emitting diode) drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206162007U CN201919204U (en) | 2010-11-19 | 2010-11-19 | LED (light-emitting diode) drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201919204U true CN201919204U (en) | 2011-08-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206162007U Expired - Lifetime CN201919204U (en) | 2010-11-19 | 2010-11-19 | LED (light-emitting diode) drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201919204U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102984842A (en) * | 2011-09-05 | 2013-03-20 | 宜兴市宏力灯杆灯具有限公司 | Constant current light-emitting diode (LED) power supply without external metal oxide semiconductor field effect transistor (MOSFET) |
| CN103337971A (en) * | 2013-06-25 | 2013-10-02 | 江苏新通达电子科技股份有限公司 | Power module circuit for electric vehicle charger controller |
| CN103857109A (en) * | 2012-11-30 | 2014-06-11 | 深圳市海洋王照明工程有限公司 | Constant-current voltage-stabilizing drive circuit and light fixture |
-
2010
- 2010-11-19 CN CN2010206162007U patent/CN201919204U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102984842A (en) * | 2011-09-05 | 2013-03-20 | 宜兴市宏力灯杆灯具有限公司 | Constant current light-emitting diode (LED) power supply without external metal oxide semiconductor field effect transistor (MOSFET) |
| CN102984842B (en) * | 2011-09-05 | 2015-02-18 | 宜兴市宏力灯杆灯具有限公司 | Constant current light-emitting diode (LED) power supply without external metal oxide semiconductor field effect transistor (MOSFET) |
| CN103857109A (en) * | 2012-11-30 | 2014-06-11 | 深圳市海洋王照明工程有限公司 | Constant-current voltage-stabilizing drive circuit and light fixture |
| CN103857109B (en) * | 2012-11-30 | 2016-06-29 | 深圳市海洋王照明工程有限公司 | A kind of constant-current voltage-stabilizing drive circuit and light fixture |
| CN103337971A (en) * | 2013-06-25 | 2013-10-02 | 江苏新通达电子科技股份有限公司 | Power module circuit for electric vehicle charger controller |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Shenzhen China Energy South Power Equipment Co., Ltd. Assignor: Tang Deming Contract record no.: 2012440020032 Denomination of utility model: Multi-stage LED driving circuit for preventing interstage interference Granted publication date: 20110803 License type: Exclusive License Record date: 20120319 |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110803 |