CN201440747U - Led series drive - Google Patents
Led series drive Download PDFInfo
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- CN201440747U CN201440747U CN2009201668734U CN200920166873U CN201440747U CN 201440747 U CN201440747 U CN 201440747U CN 2009201668734 U CN2009201668734 U CN 2009201668734U CN 200920166873 U CN200920166873 U CN 200920166873U CN 201440747 U CN201440747 U CN 201440747U
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Abstract
The utility model relates to an LED series drive, which comprises a DC-DC voltage booster circuit, a PWM control circuit, a filter circuit, a feedback circuit, a constant-current driving circuit and a plurality of LED lamps which are connected with each other in series, wherein the DC-DC voltage booster circuit sends a high voltage to the constant-current driving circuit after being filtered by the filter circuit, the constant-current driving circuit drives the plurality of LED lamps, and the PWM control circuit controls the DC-DC voltage booster circuit and ensures the stable output of the voltage of the DC-DC voltage booster circuit. The LED series driving circuit realizes that the output current is constant and adjustable, and the applied voltage range of a constant-current driving chip LC1920 is 5 to 90V, the multi-lamp series application is realized, and the constant-current circuit only requires fewer external element to realize the constant output of the current. Compared with the traditional application circuit, the size and the design cost of the entire system are reduced.
Description
Technical field
The utility model relates to a kind of driver of series LED.
Background technology
At present, the plurality of LEDs illuminating lamp of being used always in domestic lighting and the Landscape Lighting adopts structure in parallel mostly.The problem that can avoid the desired high voltage of cascaded structure to distribute in parallel does not need the equipment of boosting can realize domestic lighting.But plurality of LEDs in parallel produces two problems, and first is exactly that electric current in parallel increases along with the increase of LED quantity, brings potential safety hazard can for when electric current increases user's power consumption equipment, and fuse easily particularly fuses; The secondth, LED lamp parallel-current maldistribution, the constant-current driven chip pin is many, peripheral circuit complexity, withstand voltage problem such as low.
The utility model content
The purpose of this utility model provides a kind of LED series driver, and the LED illuminating circuit electric current that solves many parallel connections is big, be easy to generate potential safety hazard and electric current maldistribution, the constant-current driven chip pin is many, peripheral circuit is complicated, withstand voltage problem such as low.
The purpose of this utility model is to be achieved through the following technical solutions:
The LED series driver, the LED lamp that comprises DC-DC booster circuit, pwm control circuit, filter circuit, feedback circuit, constant-current drive circuit and several series connection, described DC-DC booster circuit is after filtration after the wave circuit filtering, high voltage is flowed to constant-current drive circuit, constant-current drive circuit drives several LED lamps, described pwm control circuit is controlled the DC-DC booster circuit, guarantees that the voltage output of DC-DC booster circuit is stable.
Described DC-DC booster circuit is made up of transformer T1, metal-oxide-semiconductor Q1, capacitor C 21, diode D21, D22, D23, D24, inductance L 1: the input voltage of T1 is constant pressure source 12V, D21, L1, D22 series connection back ground connection in parallel with Q1, described D23 forward inserts the T1 voltage output end;
Described pwm control circuit is made up of PMW control chip UC3843, capacitor C 11, C12, resistance R 11, R12, R13: the two ends of C12 are connected with ground wire with the I SENS pin of control chip respectively, the two ends of R13 connect the OUT pin of control chip and the grid of switching tube Q1 respectively, be connected in the COMP of control chip pin after C11 and the R11 parallel connection, the two ends of R12 are connected with the ISENS pin of switching tube Q1 and control chip respectively;
Described filter circuit is the LC filter circuit, is made up of inductance L 2, capacitor C 22;
Described feedback circuit is made up of resistance R 31, R32, R33: the R31 ground connection of connecting with Q1, and R32 connects with R33, and series connection back one end is connected with the voltage output end of T1, other end ground connection, R32 is connected with the ISWNS pin of control chip with the centre of R33;
Constant-current drive circuit is made up of constant-current driven chip LC1920, resistance R 41, resistance R 42: R41, R42 series connection, and two ends are connected with VA, the VB pin of LC1920 respectively, the IS pin of LC1920 inserts the centre of R41, R42, and the VB pin of LC1920 is connected with the LED lamp of series connection.
LED tandem drive circuit described in the utility model has realized that output current is constant adjustable, constant-current driven chip LC1920, applied voltage scope 5-90V, realize many lamp series connection application, constant-current circuit only needs a spot of outer member, just can realize that output current is constant, compare, dwindle the volume and the design cost of whole system with traditional application circuit.
Description of drawings
With embodiment the utility model is described in further detail with reference to the accompanying drawings below.
Fig. 1 is the circuit diagram of LED series driver.
Embodiment
As shown in Figure 1, LED series driver described in the utility model, the LED lamp that comprises DC-DC booster circuit, pwm control circuit, filter circuit, feedback circuit, constant-current drive circuit and several series connection, described DC-DC booster circuit is after filtration after the wave circuit filtering, high voltage is flowed to constant-current drive circuit, constant-current drive circuit drives several LED lamps, and described pwm control circuit is controlled the DC-DC booster circuit, guarantees that the voltage output of DC-DC booster circuit is stable.
Described DC-DC booster circuit is made up of transformer T1, metal-oxide-semiconductor Q1, capacitor C 21, diode D21, D22, D23, D24, inductance L 1: the input voltage of T1 is constant pressure source 12V, D21, L1, D22 series connection back ground connection in parallel with Q1, described D23 forward inserts the T1 voltage output end;
Described pwm control circuit is made up of PMW control chip UC3843, capacitor C 11, C12, resistance R 11, R12, R13: the two ends of C12 are connected with ground wire with the ISENS pin of control chip respectively, the two ends of R13 connect the OUT pin of control chip and the grid of switching tube Q1 respectively, be connected in the COMP of control chip pin after C11 and the R11 parallel connection, the two ends of R12 are connected with the ISENS pin of switching tube Q1 and control chip respectively;
Described filter circuit is the LC filter circuit, is made up of inductance L 2, capacitor C 22;
Described feedback circuit is made up of resistance R 31, R32, R33: the R31 ground connection of connecting with Q1, and R32 connects with R33, and series connection back one end is connected with the voltage output end of T1, other end ground connection, R32 is connected with the ISWNS pin of control chip with the centre of R33;
Constant-current drive circuit is made up of constant-current driven chip LC1920, resistance R 41, resistance R 42: R41, R42 series connection, and two ends are connected with VA, the VB pin of LC1920 respectively, the IS pin of LC1920 inserts the centre of R41, R42, and the VB pin of LC1920 is connected with the LED lamp of series connection.
The pwm control signal that the PWM chip produces by the output of OUT pin, is sent to the grid of switching tube Q1 by resistance R 13, as the switch controlling signal of switching tube Q1.
Under pwm control signal, DC-DC single-end ortho-exciting booster circuit input+the 12V direct current is raised to stable 311V direct current; The degaussing reset circuit of being made up of D21, D22, L1, C21 resets transformer T1 magnetic core during switching tube Q1.
The 311V direct current is wave circuit after filtration, alternating component in the filtering direct current signal and noise.
After current feedback resistance R 31 is passed through resistance R 12 and capacitor C 12 filter circuit filtering to detected current signal, be input to the ISENS pin of UC3842; The voltage feedback circuit that resistance R 32, R33 are formed feeds back to the filtered output voltage of LC on the VFB pin of UC3842; The output compensating signal that the COMP pin produces compensates voltage feedback signal through the output compensating circuit of R11 and C11 composition.UC3842 controls the duty ratio of output pwm signal by current feedback signal and voltage feedback signal are compared, thereby keeps the stable of DC-DC circuit output voltage.
The filtered output voltage positive pole of LC connects the VA pin of LC1920, is the constant-current drive circuit power supply.
The electric current of the VB pin output 20mA of LC1920, the driving LED lamp.
Resistance R 41 is a thermo-compensator, prevents constant-current driven chip LC1920 temperature overrate.Resistance R 42 is regulated the output current of VB pin.
Claims (6)
1.LED series driver, the LED lamp that comprises DC-DC booster circuit, pwm control circuit, filter circuit, feedback circuit, constant-current drive circuit and several series connection, it is characterized in that, described DC-DC booster circuit is after filtration after the wave circuit filtering, high voltage is flowed to constant-current drive circuit, constant-current drive circuit drives several LED lamps, and described pwm control circuit is controlled the DC-DC booster circuit, guarantees that the voltage output of DC-DC booster circuit is stable.
2. LED series driver according to claim 1, it is characterized in that, described DC-DC booster circuit is made up of transformer T1, metal-oxide-semiconductor Q1, capacitor C 21, diode D21, D22, D23, D24, inductance L 1: the input voltage of T1 is constant pressure source 12V, D21, L1, D22 series connection back ground connection in parallel with Q1, described D23 forward inserts the T1 voltage output end.
3. LED series driver according to claim 1, it is characterized in that, described pwm control circuit is made up of PMW control chip UC3843, capacitor C 11, C12, resistance R 11, R12, R13: the two ends of C12 are connected with ground wire with the ISENS pin of control chip respectively, the two ends of R13 connect the OUT pin of control chip and the grid of switching tube Q1 respectively, be connected in the COMP of control chip pin after C11 and the R11 parallel connection, the two ends of R12 are connected with the ISENS pin of switching tube Q1 and control chip respectively.
4. LED series driver according to claim 1 is characterized in that, described filter circuit is the LC filter circuit, is made up of inductance L 2, capacitor C 22.
5. LED series driver according to claim 1, it is characterized in that, described feedback circuit is made up of resistance R 31, R32, R33: the R31 ground connection of connecting with Q1, R32 connects with R33, series connection back one end is connected with the voltage output end of T1, other end ground connection, R32 is connected with the ISWNS pin of control chip with the centre of R33.
6. LED series driver according to claim 1, it is characterized in that, constant-current drive circuit is made up of constant-current driven chip LC1920, resistance R 41, resistance R 42: R41, R42 series connection, and two ends are connected with VA, the VB pin of LC1920 respectively, the IS pin of LC1920 inserts the centre of R41, R42, and the VB pin of LC1920 is connected with the LED lamp of series connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201668734U CN201440747U (en) | 2009-07-21 | 2009-07-21 | Led series drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201668734U CN201440747U (en) | 2009-07-21 | 2009-07-21 | Led series drive |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201440747U true CN201440747U (en) | 2010-04-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201668734U Expired - Fee Related CN201440747U (en) | 2009-07-21 | 2009-07-21 | Led series drive |
Country Status (1)
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| CN (1) | CN201440747U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101825266A (en) * | 2010-04-30 | 2010-09-08 | 福建捷联电子有限公司 | LED light tube power panel applied to liquid crystal display |
| CN101996583A (en) * | 2010-12-02 | 2011-03-30 | 惠州Tcl移动通信有限公司 | Mobile phone, OLED (Organic Light Emitting Diode) display screen module and OLED display screen drive circuit |
| CN102237043A (en) * | 2010-04-30 | 2011-11-09 | 美格纳半导体有限公司 | Circuit and method for driving a light emitting diode for a backlight, and backlight driving apparatus using the same |
| CN102469651A (en) * | 2010-11-11 | 2012-05-23 | 海洋王照明科技股份有限公司 | LED drive circuit and light fixture |
| CN102968960A (en) * | 2011-08-30 | 2013-03-13 | 美格纳半导体有限公司 | Led driver apparatus |
| CN103379705A (en) * | 2012-04-28 | 2013-10-30 | 福建捷联电子有限公司 | Driving device of LED tube |
| CN105792421A (en) * | 2016-04-05 | 2016-07-20 | 江南大学 | Bridgeless LED driving power supply |
| WO2017120795A1 (en) * | 2016-01-13 | 2017-07-20 | Tridonic Gmbh & Co Kg | Switched converter for driving leds or for supplying further led converter stage |
-
2009
- 2009-07-21 CN CN2009201668734U patent/CN201440747U/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101825266B (en) * | 2010-04-30 | 2013-08-21 | 福建捷联电子有限公司 | LED light tube power panel applied to liquid crystal display |
| CN102237043B (en) * | 2010-04-30 | 2015-05-06 | 美格纳半导体有限公司 | Circuit and method for driving a light emitting diode for a backlight, and backlight driving apparatus using the same |
| CN102237043A (en) * | 2010-04-30 | 2011-11-09 | 美格纳半导体有限公司 | Circuit and method for driving a light emitting diode for a backlight, and backlight driving apparatus using the same |
| CN101825266A (en) * | 2010-04-30 | 2010-09-08 | 福建捷联电子有限公司 | LED light tube power panel applied to liquid crystal display |
| CN102469651A (en) * | 2010-11-11 | 2012-05-23 | 海洋王照明科技股份有限公司 | LED drive circuit and light fixture |
| CN102469651B (en) * | 2010-11-11 | 2014-01-15 | 海洋王照明科技股份有限公司 | LED drive circuit and light fixture |
| CN101996583A (en) * | 2010-12-02 | 2011-03-30 | 惠州Tcl移动通信有限公司 | Mobile phone, OLED (Organic Light Emitting Diode) display screen module and OLED display screen drive circuit |
| CN102968960A (en) * | 2011-08-30 | 2013-03-13 | 美格纳半导体有限公司 | Led driver apparatus |
| CN102968960B (en) * | 2011-08-30 | 2016-05-11 | 美格纳半导体有限公司 | The method of LED driver device, LCD and driving LED back light unit |
| CN103379705A (en) * | 2012-04-28 | 2013-10-30 | 福建捷联电子有限公司 | Driving device of LED tube |
| CN103379705B (en) * | 2012-04-28 | 2015-02-18 | 福建捷联电子有限公司 | Driving device of LED tube |
| WO2017120795A1 (en) * | 2016-01-13 | 2017-07-20 | Tridonic Gmbh & Co Kg | Switched converter for driving leds or for supplying further led converter stage |
| CN108370636A (en) * | 2016-01-13 | 2018-08-03 | 赤多尼科两合股份有限公司 | Switch converters for driving LED or for supplying other LED transducer-levels |
| CN108370636B (en) * | 2016-01-13 | 2020-03-06 | 赤多尼科两合股份有限公司 | Switching converter for driving LEDs or for supplying further LED converter stages |
| CN105792421A (en) * | 2016-04-05 | 2016-07-20 | 江南大学 | Bridgeless LED driving power supply |
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Legal Events
| 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 |
Granted publication date: 20100421 Termination date: 20140721 |
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| EXPY | Termination of patent right or utility model |