CN103200738A - Constant current drive controller and light-emitting diode (LED) constant current drive circuit - Google Patents
Constant current drive controller and light-emitting diode (LED) constant current drive circuit Download PDFInfo
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- CN103200738A CN103200738A CN2013101100182A CN201310110018A CN103200738A CN 103200738 A CN103200738 A CN 103200738A CN 2013101100182 A CN2013101100182 A CN 2013101100182A CN 201310110018 A CN201310110018 A CN 201310110018A CN 103200738 A CN103200738 A CN 103200738A
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- erasing time
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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
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/382—Switched mode power supply [SMPS] with galvanic isolation between input and output
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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
- H05B45/3725—Switched mode power supply [SMPS]
Abstract
The invention belongs to the field of constant current drive circuit design, and provides a constant current drive controller and a light-emitting diode (LED) constant current drive circuit. The constant current drive controller achieves detection on degaussing time of a primary coil of a transformer through a characteristic that a capacitive circuit isolates direct currents and conducts alternating currents, and then a control circuit in the constant current drive controller achieves control of a switching frequency of a switching circuit according to the obtained degaussing time. Compared with the prior art, the constant current drive controller and the LED constant current drive circuit have the advantages of avoiding utilization of an auxiliary winding and a divider resistor of the transformer, simplifying the structure of a peripheral circuit of the constant current drive controller, improving a integration level of circuits, reducing cost, reducing the area of a system board, and meanwhile avoiding the problem that reliability is poor due to the fact that a feedback pin FB exposes.
Description
Technical field
The invention belongs to the constant-current drive circuit design field, relate in particular to a kind of constant current driving governor and LED constant-current drive circuit.
Background technology
In the feedback inverse-excitation type LED constant-current drive circuit of former limit, utilize the feedback signal of transformer, realize the constant current control to output current.Its control principle is: the output voltage of supposing this former limit feedback inverse-excitation type LED constant-current drive circuit is Vout, output current is Iout, the inductance value of transformer is Lp, the peak current of transformer is Ip, circuit work frequency (being the switching frequency of power tube in the circuit) is f, the conduction voltage drop of transformer secondary rectifier diode is Vd, and Iout=(Lp * Ip is then arranged
2* f)/[2 * (Vout+Vd)]; If be a fixed value control f/(Vout+Vd), and control Ip is constant, then output current Iout is constant; If control Ip
2/ (Vout+Vd) be a fixed value, and control f is a fixed value, can make that also output current Iout is constant.But owing in actual volume production, because transformer Lp is inconsistent, therefore might cause output current to have deviation.For this reason, as shown in Figure 1, prior art has proposed a kind of LED constant-current drive circuit, and it is by the LED constant-current drive circuit of the switching frequency of erasing time adjustment power tube, the deviation that the output current that causes with the variation of eliminating transformer sensibility reciprocal exists.
As shown in Figure 1, this LED constant-current drive circuit adopts former limit feedback inverse-excitation type structure.2 pairs of voltages via the auxiliary winding B1 feedback of primary coil T0 of resistance R 1 and resistance R carry out dividing potential drop; Degauss voltage sample circuit in the constant current driving governor is by the voltage division signal of feedback pin FB sampling resistor R1 and resistance R 2; The erasing time detection module carries out timing to this voltage division signal duration, obtains the erasing time; The constant current logic control circuit generates the switching frequency control signal of power tube NMOS by the erasing time.Suppose that the erasing time is T
DEM, the switching frequency of power tube NMOS is f, the turn ratio of primary winding and secondary winding is N, and in conjunction with volt-second characteristic, Nx (Vout+Vd) xT
DEM=Lp * Ip then has: Iout=(N * Ip * T
DEM* f)/2, because the peak current Ip of primary coil is constant, by adjusting T
DEM* f is a steady state value, can realize the constant output of Iout, and therefore, the erasing time detection module is obtaining erasing time T
DEMAfter, the constant current logic control circuit can pass through the switching frequency control signal, and the switching frequency f of control power tube NMOS is to guarantee T
DEM* f's is constant.
But in the above-mentioned LED constant-current drive circuit that prior art provides, owing to need utilize the auxiliary winding B1 of transformer T0 and divider resistance R1 and divider resistance R2 to come to provide the demagnetization detection signal for the feedback pin FB of constant current driving governor, make that the peripheral circuit device of constant current driving governor is more, cost is higher and area occupied is bigger, expose owing to feedback pin FB simultaneously, make the constant current driving governor be easy to be subjected to external disturbance, reduced the reliability of LED constant-current drive circuit.
Summary of the invention
The purpose of the embodiment of the invention is to provide the LED constant-current drive circuit, the former limit feedback inverse-excitation type LED constant-current drive circuit that being intended to solve prior art provides adopts the auxiliary winding of transformer and the detection that divider resistance is realized erase signal, make that the peripheral circuit device of its constant current driving governor is more, and expose the problem that makes that this circuit reliability is low owing to feedback pin FB.
The embodiment of the invention is to realize like this, a kind of LED constant-current drive circuit, described LED constant-current drive circuit comprises transformer T1, constant current driving governor, controls the switching circuit whether primary coil of described transformer T1 switches on by on off state, current rectifying and wave filtering circuit, described constant current driving governor comprises:
Capacitive circuit is used for output erasing time detection signal;
Control circuit is used for the described erasing time detection signal of described capacitive circuit output is sampled and timing, obtains the erasing time, and controls the switching frequency of described switching circuit according to the described erasing time.
Another purpose of the embodiment of the invention is to provide a kind of constant current driving governor, and described constant current driving governor comprises:
Capacitive circuit is used for output erasing time detection signal;
Control circuit is used for the described erasing time detection signal of described capacitive circuit output is sampled and timing, obtains the erasing time, and controls the switching frequency of outside switching circuit according to the described erasing time.
Among the present invention, the constant current driving governor is by the characteristic every straight-through friendship of capacitive circuit self, realize the detection of the erasing time of transformer, afterwards the erasing time that is obtained by the basis of the control circuit in the constant current driving governor, realize the control to the switching frequency of switching circuit.With respect to prior art, the auxiliary winding of transformer and the use of divider resistance have been avoided, simplified the peripheral circuit structure of constant current driving governor, improved circuit level, reduce cost and dwindled the area of system board, simultaneously, avoided feedback pin FB to expose and the low problem of reliability that causes.
Description of drawings
Fig. 1 is the circuit diagram of the former limit feedback inverse-excitation type LED constant-current drive circuit that provides of prior art;
Fig. 2 is the circuit diagram of the LED constant-current drive circuit that provides of the embodiment of the invention one;
Fig. 3 is the circuit diagram of the LED constant-current drive circuit that provides of the embodiment of the invention two;
Fig. 4 is the circuit diagram of the LED constant-current drive circuit that provides of the embodiment of the invention three;
Fig. 5 is the circuit diagram of the LED constant-current drive circuit that provides of the embodiment of the invention four.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the present invention, and be not used in restriction the present invention.
Problem at the prior art existence, LED constant-current drive circuit provided by the invention is the characteristic every straight-through friendship of utilizing the capacitive circuit self in the constant current driving governor, realize the detection of the erasing time of transformer, afterwards the erasing time that is obtained by the basis of the control circuit in the constant current driving governor, realize the control to the switching frequency of switching circuit.Describe implementation of the present invention in detail below with reference to embodiment:
Embodiment one
The embodiment of the invention one has proposed a kind of LED constant-current drive circuit, as shown in Figure 2, for convenience of explanation, only shows the part relevant with the embodiment of the invention one.
Specifically, this LED constant-current drive circuit comprises transformer T1, also comprise: switching circuit 2, the voltage input end of switching circuit 2 connects positive source Vin+, the voltage output end of switching circuit 2 connects first end of the primary coil of transformer T1, second end of the primary coil of transformer T1 connects power cathode Vin-, switching circuit 2 be used for by the primary coil of on off state control transformer T1 energising whether; The constant current driving governor 1 that connects switching circuit 2; Current rectifying and wave filtering circuit 3, the input of current rectifying and wave filtering circuit 3 connects the secondary coil of transformer T1, and the output of current rectifying and wave filtering circuit 3 connects load, and current rectifying and wave filtering circuit 3 is used for the output voltage of the secondary coil of transformer T1 is carried out rectification and filtering processing.Wherein, constant current driving governor 1 comprises again: capacitive circuit 11, and the input of capacitive circuit 11 connects the voltage input end of switching circuit 2, and capacitive circuit 11 is used for output erasing time detection signal; Control circuit 12, the input of control circuit 12 connects the output of capacitive circuit 11, the output of control circuit 12 connects the control input end of switching circuit 2, control circuit 12 is used for the erasing time detection signal of capacitive circuit 11 outputs is sampled and timing, obtain the erasing time, and according to the switching frequency of erasing time control switch circuit 2, to realize that the control of the switching frequency of switching circuit 2 is made that the switching frequency of switching circuit 2 and the product of erasing time are a steady state value.
In the LED constant-current drive circuit that the embodiment of the invention one provides, the constant current driving governor is by the characteristic every straight-through friendship of capacitive circuit self, realize the detection of the erasing time of transformer, afterwards the erasing time that is obtained by the basis of the control circuit in the constant current driving governor, realize the control to the switching frequency of switching circuit.With respect to prior art, the auxiliary winding of transformer and the use of divider resistance have been avoided, simplified the peripheral circuit structure of constant current driving governor, improved circuit level, reduce cost and dwindled the area of system board, simultaneously, avoided feedback pin FB to expose and the low problem of reliability that causes.
Embodiment two
The embodiment of the invention two has proposed a kind of LED constant-current drive circuit, as shown in Figure 3, for convenience of explanation, only shows the part relevant with the embodiment of the invention two.Different with embodiment one, the circuit structure of two pairs of capacitive circuit 11, control circuit 12, switching circuit 2 and current rectifying and wave filtering circuits 3 wherein of embodiment has carried out refinement.
Particularly, capacitive circuit 11 can comprise: switching tube Q1, the voltage input end of switching tube Q1 is as the input of capacitive circuit 11 and connect the voltage input end of switching circuit 2, the voltage output end of switching tube Q1 is as the output of capacitive circuit 11 and connect the input of control circuit 12, and the electric capacity in the capacitive circuit 11 is omitted living electric capacity by the source of switching tube Q1 and formed.Preferably, switching tube Q1 is the metal-oxide-semiconductor of a N raceway groove, and the drain electrode of metal-oxide-semiconductor Q1 is as the voltage input end of switching tube Q1, and the source electrode of metal-oxide-semiconductor Q1 connects the grid of metal-oxide-semiconductor Q1, and the grid of metal-oxide-semiconductor Q1 is as the voltage output end of switching tube Q1.
In the embodiment of the invention two, utilize the parasitic capacitance of the source-drain electrode of metal-oxide-semiconductor Q1, realize the characteristic every straight-through friendship that capacitive circuit 11 possesses.
Particularly, control circuit 12 can comprise: degauss voltage sample circuit 121, the input of degauss voltage sample circuit 121 is as the input of control circuit 12 and connect the output of capacitive circuit 11, degauss voltage sample circuit 121 is used for the erasing time detection signal of capacitive circuit 11 outputs is sampled, and obtains sampled signal; Erasing time testing circuit 122, the input of erasing time testing circuit 122 connects the output of degauss voltage sample circuit 121, and erasing time testing circuit 122 is used for sampled signal is carried out timing, obtains the erasing time; Constant current logic control circuit 123, the input of constant current logic control circuit 123 connects the output of erasing time testing circuit 122, the output of constant current logic control circuit 123 connects the control input end of switching circuit 2 as the output of control circuit 12, constant current logic control circuit 123 is used for the switching frequency of the erasing time control switch circuit 2 that obtains according to erasing time testing circuit 122.
In the embodiment of the invention two, degauss voltage sample circuit 121 can utilize a voltage comparator to realize.This voltage comparator compares erasing time detection signal and a reference voltage, and then obtains sampled signal.For example, if reference voltage is 1V, then when the erasing time, detection signal was higher than 1V, voltage comparator output was as the high level of sampled signal; When the erasing time detection signal is less than or equal to 1V, voltage comparator output is as the low level of sampled signal.At this moment, high level or the low level of 122 pairs of voltage comparator outputs of erasing time testing circuit are carried out timing, can obtain the erasing time.
Particularly, switching circuit 2 can comprise: switching tube Q2 and resistance R 4.Wherein, the voltage input end of switching tube Q2 is as the voltage input end of switching circuit 2 and connect positive source Vin+, the voltage output end of switching tube Q2 connects an end of resistance R 4, the other end ground connection of resistance R 4, the other end of resistance R 4 connect first end of the primary coil of transformer T1 simultaneously as the voltage output end of switching circuit 2.The control end of switching tube Q2 is as the control input end of switching circuit 2 and connect the output of control circuit 12.Preferably, switching tube Q2 is the metal-oxide-semiconductor of a N raceway groove, and the drain electrode of metal-oxide-semiconductor Q2 is as the voltage input end of switching tube Q2, and the source electrode of metal-oxide-semiconductor Q2 is as the voltage output end of switching tube Q2, and the grid of metal-oxide-semiconductor Q2 is as the control end of switching tube Q2.
Particularly, current rectifying and wave filtering circuit 3 can comprise: diode D2 and capacitor C 2.Wherein, the positive pole of diode D2 is as the input of current rectifying and wave filtering circuit 3 and connect first end of the secondary coil of transformer T1, the other end of diode D2 connects an end of capacitor C 2, the other end of capacitor C 2 connects second end of the secondary coil of transformer T1, and the two ends of capacitor C 2 connect load as the output of current rectifying and wave filtering circuit 3.
Embodiment three
The embodiment of the invention three has proposed a kind of LED constant-current drive circuit, as shown in Figure 4, for convenience of explanation, only shows the part relevant with the embodiment of the invention three.Wherein, the circuit structure of control circuit 12, switching circuit 2 and current rectifying and wave filtering circuit 3 is identical with embodiment two, does not give unnecessary details at this.
Different with embodiment two, among the embodiment three, capacitive circuit 11 can comprise: capacitor C 3, an end of capacitor C 3 be as the input of capacitive circuit 11 and connect the voltage input end of switching circuit 2, and the other end of capacitor C 3 is as the output of capacitive circuit 11 and connect the input of control circuit 12.
Embodiment four
The embodiment of the invention four has proposed a kind of LED constant-current drive circuit, as shown in Figure 5, for convenience of explanation, only shows the part relevant with the embodiment of the invention four.Wherein, the circuit structure of control circuit 12, switching circuit 2 and current rectifying and wave filtering circuit 3 is identical with embodiment two, does not give unnecessary details at this.
Different with embodiment two, among the embodiment four, capacitive circuit 11 can comprise: switching tube Q1, electric capacity in the capacitive circuit 11 is omitted living electric capacity by the source of switching tube Q1 and is formed, the voltage input end of switching tube Q1 is as the input of capacitive circuit 11 and connect the voltage input end of switching circuit 2, and the voltage output end of switching tube Q1 is as the output of capacitive circuit 11 and connect the input of control circuit 12.Similarly, switching tube Q1 is preferably the metal-oxide-semiconductor of a N raceway groove, and the drain electrode of metal-oxide-semiconductor Q1 is as the voltage input end of switching tube Q1, and the source electrode of metal-oxide-semiconductor Q1 is unsettled, and the grid of metal-oxide-semiconductor Q1 is as the voltage output end of switching tube Q1.
Embodiment five
The embodiment of the invention five has proposed a kind of constant current driving governor, its structure as above among the embodiment one to embodiment four arbitrary embodiment described, do not give unnecessary details at this.
Among the present invention, the constant current driving governor is by the characteristic every straight-through friendship of capacitive circuit self, realize the detection of the erasing time of transformer, afterwards the erasing time that is obtained by the basis of the control circuit in the constant current driving governor, realize the control to the switching frequency of switching circuit.With respect to prior art, the auxiliary winding of transformer and the use of divider resistance have been avoided, simplified the peripheral circuit structure of constant current driving governor, improved circuit level, reduce cost and dwindled the area of system board, simultaneously, avoided feedback pin FB to expose and the low problem of reliability that causes.
One of ordinary skill in the art will appreciate that all or part of step that realizes in above-described embodiment method is can control relevant hardware by program to finish, described program can be in being stored in a computer read/write memory medium, described storage medium is as ROM/RAM, disk, CD etc.
The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. LED constant-current drive circuit, it is characterized in that, described LED constant-current drive circuit comprises transformer T1, constant current driving governor, controls switching circuit, the current rectifying and wave filtering circuit whether primary coil of described transformer T1 switches on by on off state, and described constant current driving governor comprises:
Capacitive circuit is used for output erasing time detection signal;
Control circuit is used for the described erasing time detection signal of described capacitive circuit output is sampled and timing, obtains the erasing time, and controls the switching frequency of described switching circuit according to the described erasing time.
2. LED constant-current drive circuit as claimed in claim 1 is characterized in that, described capacitive circuit comprises:
Switching tube Q1, the voltage input end of described switching tube Q1 connects the voltage input end of described switching circuit, and the voltage output end of described switching tube Q1 connects the input of described control circuit.
3. LED constant-current drive circuit as claimed in claim 2, it is characterized in that, described switching tube Q1 is the metal-oxide-semiconductor of a N raceway groove, the drain electrode of described metal-oxide-semiconductor is as the voltage input end of described switching tube Q1, the source electrode of described metal-oxide-semiconductor is unsettled or connect the grid of described metal-oxide-semiconductor, and the grid of described metal-oxide-semiconductor is as the voltage output end of described switching tube Q1.
4. LED constant-current drive circuit as claimed in claim 1 is characterized in that, described capacitive circuit comprises:
Capacitor C 3, an end of described capacitor C 3 connects the voltage input end of described switching circuit, and the other end of described capacitor C 3 connects the input of described control circuit.
5. as each described LED constant-current drive circuit of claim 1 to 4, it is characterized in that described control circuit comprises:
The degauss voltage sample circuit is used for the described erasing time detection signal of described capacitive circuit output is sampled, and obtains sampled signal;
The erasing time testing circuit is used for the described sampled signal that described degauss voltage sample circuit obtains is carried out timing, obtains the erasing time;
The constant current logic control circuit is used for controlling according to the described erasing time that described erasing time testing circuit obtains the switching frequency of described switching circuit.
6. as each described LED constant-current drive circuit of claim 1 to 4, it is characterized in that described switching circuit comprises: switching tube Q2 and resistance R 4;
The voltage input end of described switching tube Q2 connects positive source, the voltage output end of described switching tube Q2 connects an end of described resistance R 4, the other end ground connection of described resistance R 4, the other end of described resistance R 4 connect first end of the primary coil of described transformer T1 simultaneously; The control end of described switching tube Q2 connects the output of described control circuit.
7. as each described LED constant-current drive circuit of claim 1 to 4, it is characterized in that described LED constant-current drive circuit also comprises current rectifying and wave filtering circuit, described current rectifying and wave filtering circuit comprises: diode D2 and capacitor C 2;
The positive pole of described diode D2 connects first end of the secondary coil of described transformer T1, the other end of described diode D2 connects an end of described capacitor C 2, the other end of described capacitor C 2 connects second end of the secondary coil of described transformer T1, and the two ends of described capacitor C 2 connect load.
8. a constant current driving governor is characterized in that, described constant current driving governor comprises:
Capacitive circuit is used for output erasing time detection signal;
Control circuit is used for the described erasing time detection signal of described capacitive circuit output is sampled and timing, obtains the erasing time, and controls the switching frequency of outside switching circuit according to the described erasing time.
9. constant current driving governor as claimed in claim 9 is characterized in that, described capacitive circuit comprises:
Switching tube Q1, the voltage input end of described switching tube Q1 connects the voltage input end of described switching circuit, and the voltage output end of described switching tube Q1 connects the input of described control circuit.
10. constant current driving governor as claimed in claim 9 is characterized in that, described capacitive circuit comprises:
Capacitor C 3, an end of described capacitor C 3 connects the voltage input end of described switching circuit, and the other end of described capacitor C 3 connects the input of described control circuit.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310110018.2A CN103200738B (en) | 2013-03-29 | 2013-03-29 | A kind of constant current driving governor and constant current driver circuit for LED |
| PCT/CN2014/073243 WO2014154091A1 (en) | 2013-03-29 | 2014-03-11 | Constant current drive controller and led constant current drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310110018.2A CN103200738B (en) | 2013-03-29 | 2013-03-29 | A kind of constant current driving governor and constant current driver circuit for LED |
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| CN103200738A true CN103200738A (en) | 2013-07-10 |
| CN103200738B CN103200738B (en) | 2015-11-25 |
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| WO (1) | WO2014154091A1 (en) |
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| CN103747600A (en) * | 2014-01-29 | 2014-04-23 | 深圳市明微电子股份有限公司 | High-power-factor strobe-free method and device for outputting constant current |
| CN103929855A (en) * | 2014-04-02 | 2014-07-16 | 深圳市明微电子股份有限公司 | LED lighting device, LED driving circuit and switch power source driving chip of LED driving circuit |
| WO2014154091A1 (en) * | 2013-03-29 | 2014-10-02 | 深圳市明微电子股份有限公司 | Constant current drive controller and led constant current drive circuit |
| CN104602390A (en) * | 2014-01-14 | 2015-05-06 | 深圳市稳先微电子有限公司 | Dual-winding single-stage primary feedback LED (Light Emitting Diode) lamp drive circuit |
| CN108365757A (en) * | 2018-03-27 | 2018-08-03 | 深圳市群芯科创电子有限公司 | A kind of constant-current device |
| CN111489877A (en) * | 2020-05-07 | 2020-08-04 | 浙江桃园智能科技有限公司 | Electromagnetic coil driving circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2014154091A1 (en) * | 2013-03-29 | 2014-10-02 | 深圳市明微电子股份有限公司 | Constant current drive controller and led constant current drive circuit |
| CN104602390A (en) * | 2014-01-14 | 2015-05-06 | 深圳市稳先微电子有限公司 | Dual-winding single-stage primary feedback LED (Light Emitting Diode) lamp drive circuit |
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| CN103747600A (en) * | 2014-01-29 | 2014-04-23 | 深圳市明微电子股份有限公司 | High-power-factor strobe-free method and device for outputting constant current |
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| CN108365757A (en) * | 2018-03-27 | 2018-08-03 | 深圳市群芯科创电子有限公司 | A kind of constant-current device |
| CN108365757B (en) * | 2018-03-27 | 2023-10-17 | 深圳市群芯科创电子有限公司 | Constant-current device |
| CN111489877A (en) * | 2020-05-07 | 2020-08-04 | 浙江桃园智能科技有限公司 | Electromagnetic coil driving circuit |
| CN111489877B (en) * | 2020-05-07 | 2022-08-26 | 浙江桃园智能科技有限公司 | Electromagnetic coil driving circuit |
Also Published As
| Publication number | Publication date |
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| WO2014154091A1 (en) | 2014-10-02 |
| CN103200738B (en) | 2015-11-25 |
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