CN105611675A - Low-power LED driving module, driving circuit and operating method - Google Patents
Low-power LED driving module, driving circuit and operating method Download PDFInfo
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- CN105611675A CN105611675A CN201610093058.4A CN201610093058A CN105611675A CN 105611675 A CN105611675 A CN 105611675A CN 201610093058 A CN201610093058 A CN 201610093058A CN 105611675 A CN105611675 A CN 105611675A
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- driver module
- led driver
- power switch
- module
- switch pipe
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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
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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]
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Abstract
The invention relates to a low-power LED driving module, a driving circuit and an operating method. The LED driving module comprises a power switch tube, a logic control module, a driving module and a high voltage start module; when the internal power switch tube of the LED driving module is in a switch-on state, a CS end feeds back a detected voltage value to a Vcc end voltage, and performs difference calculation; the difference value is compared with a reference voltage Vref of the LED driving module; if the difference value is lower than the Vref, the LED driving module triggers the internal power switch tube to be switched off; if the internal power switch tube of the LED driving module is in a switch-off state at the moment, the circuit performs the normal operation through a fly-wheel diode; at the current moment, when the magnetic field in the Drain end and the Source end of the power switch tube is detected to be close to zero by a magnetic coupling technology, the switch-on of the internal power switch tube is realized by the LED driving module; in addition, the LED driving module adopts a high-voltage power supply technology without requiring an auxiliary winding to detect and supply power; and therefore, the peripheral devices are simpler, and the cost and the volume of the system are saved.
Description
Technical field
The present invention relates to a kind of LED driving power field, be especially applicable to low-power LED driver module, drive circuit and method of work.
Background technology
Along with the development of LED technology, LED lamp is because it has environmental protection and energy saving, power consumption is little, the advantages such as long service life, in even daily life is thrown light in low-light level, obtain applying more and more widely, LED etc. need to be operated in low-voltage direct state, in the time adopting mains-supplied, direct current be must be rectified into, then LED operating current, voltage provided by switch-type stabilized power supply.
The LED driver module that traditional switch-type stabilized power acquisition is used, this LED driver module comprises that CS end (current sample end), ZCD hold (zero passage detection end) and GND (earth terminal), and two ports adopt the independent mode arranging to connect corresponding circuit, this connected mode does not realize the optimization to LED drive circuit, makes to a certain extent circuit become complicated.
But, ZCD can be held to (zero passage detection end) and GND (earth terminal) and CS(current sample end at low-power LED driver module) and multiplexing, thus simplify described LED driver module peripheral circuit, reduce costs.
Summary of the invention
The object of this invention is to provide a kind of low-power LED driver module and method of work thereof, it leaks Source end magnetic field by detection CS terminal voltage and power switch pipe realizes the control to power switch pipe, make LED driver module more succinct, the drive circuit of formation is optimized more.
In order to solve the problems of the technologies described above, the invention provides a kind of LED driver module, comprising: power switch pipe, Logic control module, driver module and high voltage startup module,
Described when power switch pipe is during in conducting state, CS end will detect that magnitude of voltage feeds back to Vcc end, and carry out difference calculating, with described LED driver module reference voltage V ref comparison, if difference is less than described LED driver module reference voltage V ref, described LED driver module triggers the shutoff of internal power switching tube;
When described power switch pipe is in off state, now can adopt magnetic coupling technology detection power switching tube Drain end and the magnetic field that Source holds, realize the conducting of described LED driver module triggering internal power switching tube.
Further, described LED driver module also comprises comparator A1, computing circuit module, magnetic coupling detection module;
The output of described computing circuit module and comparator A1Input anode be connected;
Described comparator A1The value of input negative terminal be internal reference magnitude of voltage Vref;
Described comparator A1Output and the output andlogic control module input of magnetic coupling detection module be connected;
The output of described Logic control module is connected with driver module input, and driver module output is connected with the Gate end of power switch pipe;
Trigger described LED driver module power switch pipe is turn-offed when the voltage difference of computing circuit output is less than described LED driver module internal reference voltage Vref, described magnetic coupling detection module can detection power switching tube leaks Source end magnetic field be triggered power switch pipe and open.
Further, the Vcc of described LED driver module end is connected with the input of computing circuit module with CS end;
Described power switch pipe Drain end is connected with the input of high voltage startup module, and the output of described high voltage startup module is connected with the Vcc end of LED driver module.
Another aspect, the present invention also provides a kind of method of work of LED driver module,
When described power switch pipe is during in conducting state, CS end will detect that magnitude of voltage feeds back to Vcc end, and carry out difference calculating, and with described LED driver module reference voltage V ref comparison, if difference is less than Vref, described LED driver module triggering internal signal turn-offs power switch pipe;
If described power switch pipe is in off state, circuit is normally worked through sustained diode, now can adopt the magnetic field of magnetic coupling technology detection power switching tube Drain end and Source end, when it is close to zero time, realize described LED driver module and trigger the conducting of internal power switching tube.
The third aspect, the present invention also provides a kind of drive circuit and method of work thereof of applying described LED driver module, is realizing on the basis of LED drive circuit function to realize, and simplified driving circuit structure, reduces costs.
In order to solve the problems of the technologies described above, the invention provides a kind of constant-current drive circuit of applying described LED driver module, comprising:
Rectifier bridge, energy storage inductor L, storage capacitor C1, output capacitance C2, sampling resistor Rcs, LED load RLAnd sustained diode;
In the time of described power switch pipe conducting, electric current is through rectifier bridge, energy storage inductor L, LED load RLForm loop with sampling resistor Rcs;
In the time that described power switch pipe is closed, electric current is through energy storage inductor L, LED load RLForm loop with sustained diode.
Fourth aspect, the present invention also provides a kind of method of work of LED constant-current drive circuit,
Described LED drive circuit comprises the LED driver module as described in as arbitrary in claim 1-3;
The method of work of described LED drive circuit realizes as follows:
The first step, in the time that described LED drive circuit is connected, electric current can be given storage capacitor C after rectifier bridge1Charging and electric current are held to capacitor C to Vcc by high voltage startup module through Drain end3Charging;
Second step, as input capacitance C3Charging (Vcc terminal voltage) is during to LED driver module cut-in voltage UVLO_ON, the conducting of LED driver module power switch pipe;
The 3rd step, when in LED driver module when power switch pipe conducting, Vcc and CS terminal voltage difference are that Vref(is Vref=Vs-Rcs*IL), along with ILIncrease, make Vref=Vs-Vref1Time (Vref1For constant), close power switch pipe, I nowLElectric current is designated as Ipk；
The 4th step, in the time that in LED driver module, power switch pipe is closed, now energy storage inductor L flows out from energy storage inductor right-hand member as power supply and electric current, charge and pass through sustained diode and get back to energy storage inductor negative terminal to load, and the inner detection power switching tube of LED driver module leaks Source end magnetic field, when it is close to zero time, close LED driver module power switch pipe.
The invention has the beneficial effects as follows, LED driver module of the present invention and method of work thereof, and apply drive circuit and the method for work thereof of described LED driver module, by described LED driver module pin time-sharing multiplex has been realized to the control to power switch pipe, make LED driver module more succinct, and the drive circuit forming is optimized more, effectively reduced circuit cost.
Brief description of the drawings
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 shows the schematic diagram of LED driver module of the present invention and drive circuit thereof.
Fig. 2 shows circuit timing diagram of the present invention.
In figure, the value of Vref is Vs-Rcs*IL; Comparator A1, magnetic coupling module, logical operation module, driver module, wherein Vs is the voltage that Vcc connects electric capacity; Vref1For LED driver module internal reference magnitude of voltage, it is a constant; Vdd is the cut-in voltage of power switch pipe, is a constant; Ics is the electric current flowing through on sampling resistor Rcs.
Detailed description of the invention
In conjunction with the accompanying drawings, the present invention is further detailed explanation. These accompanying drawings are the schematic diagram of simplification, and basic structure of the present invention is only described in a schematic way, and therefore it only shows the formation relevant with the present invention.
Embodiment 1
As depicted in figs. 1 and 2, a kind of LED driver module of the present invention, comprising: power switch pipe, Logic control module, driver module and high voltage startup module,
Described when power switch pipe is during in conducting state, CS end will detect that magnitude of voltage feeds back to Vcc end, and carry out difference calculating, with described LED driver module reference voltage V ref comparison, if difference is less than described LED driver module reference voltage V ref, described LED driver module triggers the shutoff of internal power switching tube;
When described power switch pipe is in off state, now can adopt magnetic coupling technology detection power switching tube Drain end and the magnetic field that Source holds, realize the conducting of described LED driver module triggering internal power switching tube.
Further, described LED driver module also comprises comparator A1, computing circuit module, magnetic coupling detection module;
The output of described computing circuit module and comparator A1Input anode be connected;
Described comparator A1The value of input negative terminal be internal reference magnitude of voltage Vref;
Described comparator A1Output and the output andlogic control module input of magnetic coupling detection module be connected;
The output of described Logic control module is connected with driver module input, and driver module output is connected with the Gate end of power switch pipe;
Trigger described LED driver module power switch pipe is turn-offed when the voltage difference of computing circuit output is less than described LED driver module internal reference voltage Vref, described magnetic coupling detection module can detection power switching tube leaks Source end magnetic field be triggered power switch pipe and open.
Further, the Vcc of described LED driver module end is connected with the input of computing circuit module with CS end;
Described power switch pipe Drain end is connected with the input of high voltage startup module, and the output of described high voltage startup module is connected with the Vcc end of LED driver module.
Embodiment 2
On embodiment 1 basis, the present invention also provides a kind of method of work of LED driver module, when described power switch pipe is during in conducting state, CS end will detect that magnitude of voltage feeds back to Vcc end, and carry out difference calculating, and with described LED driver module reference voltage V ref comparison, if difference is less than Vref, described LED driver module triggers internal signal power switch pipe is turn-offed;
If described power switch pipe is in off state, circuit is normally worked through sustained diode, now can adopt the magnetic field of magnetic coupling technology detection power switching tube Drain end and Source end, when it is close to zero time, realize described LED driver module and trigger the conducting of internal power switching tube.
Embodiment 3
On embodiment 1, the present invention also provides a kind of drive circuit of LED driver module, comprising:
Rectifier bridge, energy storage inductor L, storage capacitor C1, output capacitance C2, sampling resistor Rcs, LED load RLAnd sustained diode;
In the time of described power switch pipe conducting, electric current is through rectifier bridge, energy storage inductor L, LED load RLForm loop with sampling resistor Rcs;
In the time that described power switch pipe is closed, electric current is through energy storage inductor L, LED load RLForm loop with sustained diode.
Embodiment 4
On above-described embodiment basis, the present invention also provides a kind of method of work of LED drive circuit, and described LED drive circuit comprises the LED driver module as described in as arbitrary in claim 1-3;
The method of work of described LED drive circuit realizes as follows:
The first step, in the time that described LED drive circuit is connected, electric current can be given storage capacitor C after rectifier bridge1Charging and electric current are held to capacitor C to Vcc by high voltage startup module through Drain end3Charging;
Second step, as input capacitance C3Charging (Vcc terminal voltage) is during to LED driver module cut-in voltage UVLO_ON, the conducting of LED driver module power switch pipe;
The 3rd step, when in LED driver module when power switch pipe conducting, Vcc and CS terminal voltage difference are that Vref(is Vref=Vs-Rcs*IL), along with ILIncrease, make Vref=Vs-Vref1Time (Vref1For constant), close power switch pipe, I nowLElectric current is designated as Ipk；
The 4th step, in the time that in LED driver module, power switch pipe is closed, now energy storage inductor L flows out from energy storage inductor right-hand member as power supply and electric current, charge and pass through sustained diode and get back to energy storage inductor negative terminal to load, and the inner detection power switching tube of LED driver module leaks Source end magnetic field, when it is close to zero time, close LED driver module power switch pipe; So far be described constant-current LED driving work one-period, drive repeated work operation can maintain constant output current if repeat this, and constant output current value can be expressed as Iled=Ipk/2：
The specific works process of embodiment 2 to embodiment 4, can, referring to the associated description of embodiment 1, no longer repeat here.
Taking above-mentioned foundation desirable embodiment of the present invention as enlightenment, by above-mentioned description, relevant staff can, not departing from the scope of this invention technological thought, carry out various change and amendment completely. The technical scope of this invention is not limited to the content on description, must determine its technical scope according to claim scope.
Claims (6)
1. a LED driver module, is characterized in that, comprising: power switch pipe, Logic control module, driver module and high voltage startup module,
Described when power switch pipe is during in conducting state, CS end will detect that magnitude of voltage feeds back to Vcc end, and carry out difference calculating, with described LED driver module reference voltage V ref comparison, if difference is less than described LED driver module reference voltage V ref, described LED driver module triggers the shutoff of internal power switching tube;
When described power switch pipe is in off state, now can adopt magnetic coupling technology detection power switching tube Drain end and the magnetic field that Source holds, realize the conducting of described LED driver module triggering internal power switching tube.
2. LED driver module as claimed in claim 1, is characterized in that, also comprises comparator A1, computing circuit module, magnetic coupling detection module;
The output of described computing circuit module and comparator A1Input anode be connected;
Described comparator A1The value of input negative terminal be internal reference magnitude of voltage Vref;
Described comparator A1Output and the output andlogic control module input of magnetic coupling detection module be connected;
The output of described Logic control module is connected with driver module input, and driver module output is connected with the Gate end of power switch pipe;
Trigger described LED driver module power switch pipe is turn-offed when the voltage difference of computing circuit output is less than described LED driver module internal reference voltage Vref, described magnetic coupling detection module can detection power switching tube leaks Source end magnetic field be triggered power switch pipe and open.
3. LED driver module as claimed in claim 2, is characterized in that,
The Vcc end of described LED driver module is connected with the input of computing circuit module with CS end;
Described power switch pipe Drain end is connected with the input of high voltage startup module, and the output of described high voltage startup module is connected with the Vcc end of LED driver module.
4. a method of work for LED driver module, is characterized in that,
When described power switch pipe is during in conducting state, CS end will detect that magnitude of voltage feeds back to Vcc end, and carry out difference calculating, and with described LED driver module reference voltage V ref comparison, if difference is less than Vref, described LED driver module triggering internal signal turn-offs power switch pipe;
If described power switch pipe is in off state, circuit is normally worked through sustained diode, now can adopt the magnetic field of magnetic coupling technology detection power switching tube Drain end and Source end, when it is close to zero time, realize described LED driver module and trigger the conducting of internal power switching tube.
5. a drive circuit for the LED driver module of application as described in as arbitrary in claim 1-3, is characterized in that,
Comprise: rectifier bridge, storage capacitor C1, energy storage inductor L, output capacitance C2, sampling resistor Rcs, LED load RLAnd sustained diode;
In the time of described power switch pipe conducting, electric current is through rectifier bridge, energy storage inductor L, LED load RLForm loop with sampling resistor Rcs;
In the time that described power switch pipe is closed, electric current is through energy storage inductor L, LED load RLForm loop with sustained diode.
6. a method of work for LED drive circuit, is characterized in that,
Described LED drive circuit comprise energy-storage units and as arbitrary in claim 1-3 as described in LED driver module;
The method of work of described LED drive circuit realizes as follows:
The first step, in the time that described LED drive circuit is connected, electric current can be given storage capacitor C after rectifier bridge1Charging and electric current also can be held to capacitor C to Vcc by high voltage startup module through Drain end3Charging;
Second step, as input capacitance C3Charging (Vcc terminal voltage) when the described LED driver module cut-in voltage UVLO_ON, the conducting of LED driver module power switch pipe;
The 3rd step, when in described LED driver module when power switch pipe conducting, Vcc and CS terminal voltage difference are that Vref(is Vref=Vs-Rcs*IL), along with ILIncrease, make Vref=Vs-Vref1Time (Vref1For constant), close power switch pipe, I nowLElectric current is designated as Ipk；
The 4th step, in the time that in described LED driver module, power switch pipe is closed, now energy storage inductor L flows out from energy storage inductor right-hand member as power supply and electric current, charge and pass through sustained diode and get back to energy storage inductor negative terminal to load, and the inner detection power switching tube of described LED driver module leaks Source end magnetic field, when it is close to zero time, close described LED driver module power switch pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610093058.4A CN105611675A (en) | 2016-02-21 | 2016-02-21 | Low-power LED driving module, driving circuit and operating method |
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| CN201610093058.4A CN105611675A (en) | 2016-02-21 | 2016-02-21 | Low-power LED driving module, driving circuit and operating method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107426880A (en) * | 2017-09-07 | 2017-12-01 | 上海晶丰明源半导体股份有限公司 | LED current ripple eliminates circuit, method and its chip, LED device |
| CN107426881A (en) * | 2017-09-07 | 2017-12-01 | 上海晶丰明源半导体股份有限公司 | Integrator, LED current ripple eliminate circuit and method, LED driver and LED device |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103108470A (en) * | 2013-02-06 | 2013-05-15 | 深圳市芯飞凌半导体有限公司 | Dynamic linear control light emitting diode (LED) driver circuit |
| CN103167670A (en) * | 2011-12-14 | 2013-06-19 | 上海北京大学微电子研究院 | Light-emitting diode (LED) drive circuit and constant-current control method |
| CN103179751A (en) * | 2013-03-08 | 2013-06-26 | 上海晶丰明源半导体有限公司 | LED driving circuit capable of realizing complete-period sampling of inductive current |
| CN203206529U (en) * | 2013-03-08 | 2013-09-18 | 上海晶丰明源半导体有限公司 | A LED driving circuit sampling inductive current in a complete period |
| CN103533711A (en) * | 2013-10-18 | 2014-01-22 | 深圳市富满电子有限公司 | Non-isolated LED (Light-Emitting Diode) driving circuit |
| CN204014223U (en) * | 2014-08-27 | 2014-12-10 | 无锡硅动力微电子股份有限公司 | Low cost compact led drive circuit chip |
| US20150334803A1 (en) * | 2011-11-15 | 2015-11-19 | On-Bright Electronics (Shanghai) Co., Ltd. | Led lighting systems and methods for constant current control in various operation modes |
| CN205596385U (en) * | 2016-02-21 | 2016-09-21 | 常州顶芯半导体技术有限公司 | Miniwatt LED drive module , drive circuit |
-
2016
- 2016-02-21 CN CN201610093058.4A patent/CN105611675A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150334803A1 (en) * | 2011-11-15 | 2015-11-19 | On-Bright Electronics (Shanghai) Co., Ltd. | Led lighting systems and methods for constant current control in various operation modes |
| CN103167670A (en) * | 2011-12-14 | 2013-06-19 | 上海北京大学微电子研究院 | Light-emitting diode (LED) drive circuit and constant-current control method |
| CN103108470A (en) * | 2013-02-06 | 2013-05-15 | 深圳市芯飞凌半导体有限公司 | Dynamic linear control light emitting diode (LED) driver circuit |
| CN103179751A (en) * | 2013-03-08 | 2013-06-26 | 上海晶丰明源半导体有限公司 | LED driving circuit capable of realizing complete-period sampling of inductive current |
| CN203206529U (en) * | 2013-03-08 | 2013-09-18 | 上海晶丰明源半导体有限公司 | A LED driving circuit sampling inductive current in a complete period |
| CN103533711A (en) * | 2013-10-18 | 2014-01-22 | 深圳市富满电子有限公司 | Non-isolated LED (Light-Emitting Diode) driving circuit |
| CN204014223U (en) * | 2014-08-27 | 2014-12-10 | 无锡硅动力微电子股份有限公司 | Low cost compact led drive circuit chip |
| CN205596385U (en) * | 2016-02-21 | 2016-09-21 | 常州顶芯半导体技术有限公司 | Miniwatt LED drive module , drive circuit |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107426880A (en) * | 2017-09-07 | 2017-12-01 | 上海晶丰明源半导体股份有限公司 | LED current ripple eliminates circuit, method and its chip, LED device |
| CN107426881A (en) * | 2017-09-07 | 2017-12-01 | 上海晶丰明源半导体股份有限公司 | Integrator, LED current ripple eliminate circuit and method, LED driver and LED device |
| CN107426880B (en) * | 2017-09-07 | 2023-04-18 | 上海晶丰明源半导体股份有限公司 | LED current ripple eliminating circuit, method and chip thereof, and LED equipment |
| CN107426881B (en) * | 2017-09-07 | 2023-09-22 | 上海晶丰明源半导体股份有限公司 | Integrator, LED current ripple cancellation circuit and method |
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