CN203301821U - Dimmable LED lighting driver circuit - Google Patents
Dimmable LED lighting driver circuit Download PDFInfo
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- CN203301821U CN203301821U CN2013203277021U CN201320327702U CN203301821U CN 203301821 U CN203301821 U CN 203301821U CN 2013203277021 U CN2013203277021 U CN 2013203277021U CN 201320327702 U CN201320327702 U CN 201320327702U CN 203301821 U CN203301821 U CN 203301821U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The utility model discloses a dimmable LED (Light-Emitting Diode) lighting driver circuit based on a thyristor dimmer. The dimmable LED lighting driver circuit comprises a thyristor dimmer and a rectifier bridge, the two of which are orderly connected to an input signal, wherein the output of the rectifier bridge is connected to a thyristor phase detection module; the output of the thyristor phase detection module is connected to a pulse generator and the input end of an LOG curve generator; the output end of the LOG curve generator is connected to the input end of a sampling-holding module; the output end of the pulse generator is connected to the control end of the sampling-holding module; the output end of the sampling-holding module is connected to the input end of a voltage-controlled current source; and the output of the voltage-controlled current source is connected to an LED load so as to control the current of the LED load. The dimmable LED lighting driver circuit is high in dimming linearity and suitable for human eyes to feel, and simultaneously, free of delay in dimming and high in accuracy; and the dimmable LED lighting driver circuit further is capable of eliminating ripples on the control signal of the voltage-controlled current source.
Description
Technical field
The utility model relates to the drive circuit of LED illumination, especially a kind ofly can carry out to the LED lighting device drive circuit of linearity light adjusting.
Background technology
LED is the abbreviation of English Light Emitting Diode, and the meaning is light-emitting diode, be a kind of can be the solid-state semiconductor device of visible light with electric energy conversion, it can directly be converted into light to electricity.Because its semi-conductive principle of luminosity, need a dc powered, so LED lighting apparatus demand motive drives.
Existing LED illumination driving circuit has a class to be based on silicon controlled dimmer for light control, circuit block diagram as Fig. 1, comprise controllable silicon dimmer 7, by connecting phase detecting module 1 after rectifier bridge 8, input signal 17 is by phase detecting module 1, the silicon controlled control phase is converted to the square-wave signal of a power frequency, this square wave signal is through 16 rectifications of RC low pass filter, obtain a direct current signal that is directly proportional to controllable silicon dimmer 7 control phases, by the electric current of the direct control load LED of this direct current signal lamp 6, the electric current of LED lamp is carried out linear regulation.
In fact, although this traditional dimming mode is the input current of the change LED lamp of linearity, the brightness of the LED lamp that human eye is experienced and nonlinear variation, do not meet the sense organ requirement of human eye, the light modulation process is nature, not soft not, there will be the sensation of brightness beat when serious.Simultaneously, traditional light-dimming method need to be rectified into direct current signal with the square-wave signal of a power frequency, in order to reduce the ripple on direct current signal, improve the stability of LED illumination drive current, need the RC filter that bandwidth is very low, therefore the light modulation response speed is very slow, and the brightness of LED lamp there will be very long time delay when regulating controllable dimming device phase place, and affects the light modulation precision.Shown in Figure 2 is exactly under this traditional light regulating technology, the graph of a relation of the brightness of the silicon controlled angle of flow and LED lamp, aforesaid this non-corresponding linear relationship just.
The utility model content
The purpose of this utility model is the defect for deficiencies such as light modulation linearity of the described existing LED illumination driving circuit based on controllable silicon light modulation of background technology, delays, invents that a kind of good linearity, time of delay are short, fast response time, LED drive circuit that precision is high.
For reaching the foregoing invention purpose, concrete technological means of the present utility model is as follows:
a kind of LED illumination driving circuit, comprise the controllable silicon dimmer and the rectifier bridge that are connected in turn on input signal, rectifier bridge output is connected to the controllable silicon phase detecting module, the output of controllable silicon phase detecting module connects the input of a pulse generator and a LOG curve generator, the output of LOG curve generator connects sampling and keeps the input of module, the output of pulse generator connects sampling and keeps the control end of module, sampling keeps the output of module to be connected to the input of voltage-controlled current source, voltage-controlled current source output connects the LED load, control the electric current in the LED load.
Preferably: described LOG curve generator is that electric capacity passes through resistance charge or discharge generation voltage signal, and square wave high level or low level control that the capacitor charge and discharge time is produced by pulse generator.
The particular circuit configurations of concrete preferred LOG curve generator is: comprise time delay module, Logic control module, charging resistor, charging capacitor and two switches, signal input part is connected to time delay module, time delay module is connected with Logic control module, Logic control module is controlled two switches, and two switches are connected between voltage and ground, middle serial connection charge resistance, charging capacitor is connected in parallel on the resistance of charging resistor and ground connection, is signal output part on charging capacitor.
That circuit of the present utility model has is simple in structure, be easy to integrated, high reliability, can carry out the light modulation of LOG curve to the LED lighting device, meet the sense organ requirement of human eye, eliminated simultaneously the ripple of light modulation time of delay and voltage-controlled current source control signal, improve light modulation response speed and light modulation precision, meet the requirement of high-performance Dimmable LED lighting device.
Description of drawings
Fig. 1 is the silicon controlled dimmer for light control drive circuit block diagram of existing LED lighting device;
Fig. 2 is the relation curve between LED lamp current and the brightness of LED lamp and the controllable silicon dimmer angle of flow in prior art;
Fig. 3 is LED lighting device silicon controlled dimmer for light control drive circuit block diagram of the present utility model;
Fig. 4 is sinusoidal cut signal 15 and phase detecting module output signal 11 relations in Fig. 3;
Fig. 5 is the utility model LOG curve generator representative instance one;
Fig. 6 is phase detecting module 1 output signal 11, LOG curve generator 3 output signals 13 of the utility model embodiment one, and sampling keeps the timing diagram of module 2 control signals;
Fig. 7 is the utility model LOG curve generator representative instance two;
Fig. 8 is phase detecting module 1 output signal 11, LOG curve generator 3 output signals 13 of the utility model embodiment two, and sampling keeps the timing diagram of module 2 control signals;
Fig. 9 is the relation curve between the utility model LED lamp output current and the brightness of LED lamp and the controllable silicon dimmer angle of flow.
Embodiment
particular circuit configurations as Fig. 3, input signal connects controllable silicon dimmer 7 and rectifier bridge 8, rectifier bridge 8 outputs are connected to controllable silicon phase detecting module 1, 1 output of controllable silicon phase detecting module connects the input of a pulse generator 2 and a LOG curve generator 3, the output of LOG curve generator 3 connects sampling and keeps the input of module 4, the output of pulse generator 2 connects sampling and keeps the control end of module 4, sampling keeps the output of module 4 to be connected to the input of voltage-controlled current source 5, voltage-controlled current source 5 outputs connect LED load 6, control the electric current in LED load 6.
Principle of the present utility model is: input exchange signal after controllable silicon dimmer cut and rectifier bridge, produces sinusoidal cut signal 15, and phase detecting module 1 detects the phase place of sinusoidal cut signal, and namely the controllable silicon dimmer phase place, convert thereof into square-wave signal 11.Sinusoidal cut signal 15 and phase detecting module 1 output signal 11 relations are as shown in Figure 4.Phase detecting module 1 output signal 11 has directly been reacted the control phase of controllable silicon dimmer 7.
The LOG curve generator is that electric capacity passes through resistance charge or discharge generation voltage signal, and square wave high level or low level control that the capacitor charge and discharge time is produced by pulse generator.The example structure explanation course of work of the present utility model below in conjunction with LOG curve generator and pulse generator.
Embodiment one:
As shown in Figure 5, signal 11 is through time delay module 18 and Logic control module 19, and when signal 11 is low level (in the SCR control angle), switch S 1 is turn-offed, and S2 opens, and capacitor C 1 is by resistance R 1 discharge, and the voltage signal 13 on capacitor C 1 is exponential curve.Pulse generator 2 produces a pulse signal 12 at the rising edge (controlled silicon conducting constantly) of signal 11, and signal 12 is input to sampling and keeps the control end of module 4, and sampling keeps module 4 signal 13 to sample and kept temporarily at each pulse signal.Fig. 6 is phase detecting module 1 output signal 11, LOG curve generator 3 output signals 13, and sampling keeps the graph of a relation of module 2 control signals.When the controllable silicon dimmer control phase changes, the rising edge of the discharge time of capacitor C 1 and signal 11 is constantly along with the controllable silicon phase place changes, pulse signal 12 produces constantly along with the controllable silicon dimmer control phase changes, sampling keeps the generation moment of module 4 according to pulse signal 12, to the voltage sample on capacitor C 1 and maintenance.When the controllable silicon phase place changes continuously, sampling keeps the output signal 14 of module 4 identical with LOG curve generator 3 output signals 13, for the discharge curve of capacitor C 1 by resistance R 1, therefore sampling keeps module 4 output signals 14 and the LOG curve generator 3 the same exponentially type of output signal 13 discharge curves.Sampling keeps module 4 output signals 14 to control voltage-controlled current sources 5, the gain of the voltage-controlled current source 5 of this moment be on the occasion of, namely the value of signal 14 is larger, the LED output current is larger, the value of signal 14 is less, the LED output current is less.Simultaneously in conjunction with Fig. 4 and Fig. 6 as can be known, in the controllable silicon dimmer angle of flow, signal 11 is high level, the angle of flow of controllable silicon dimmer is larger, and the duty ratio of signal 11 is larger, and capacitor C 1 is less by the time of resistance R 1 discharge, the value of signal 14 is larger, and the LED output current is just larger; Otherwise the angle of flow of controllable silicon dimmer is less, and the duty ratio of signal 11 is less, and capacitor C 1 is larger by the time of resistance R 1 discharge, and the value of signal 14 is less, and the LED output current is less.The index discharge curve voltage signal of signal 14 is controlled voltage-controlled current source 5, and the current curve of voltage-controlled current source 5 outputs is exponentially discharge-type curve, i.e. LED output current exponentially discharge-type curve also.Capacitor C 1 occurs in controllable silicon dimmer by resistance R 1 discharge and controls in pilot angle, the angle of flow of controllable silicon dimmer is the pilot angle that one-period π deducts controllable silicon dimmer, therefore, relation between LED output current curve and the controllable silicon dimmer angle of flow should with LED output current curve and controllable silicon dimmer pilot angle between relation become in the horizontal direction mirror, obtain as shown in Figure 9 the LED output current and the relation curve between thyristor operating angle.As shown in Figure 2 and Figure 9, the present embodiment utilizes above-mentioned exponential type discharge curve to revise LED output current curve in Fig. 2, while changing thyristor operating angle is by 0 ° to 180 °, make the LED output current according to the curvilinear motion in Fig. 9, LED lamp brightness change curve in Fig. 2 is modified to linearity curve in Fig. 9 by the LOG curve, realizes the LOG curve light modulation to the LED lighting device.The utility model also utilizes sampling maintenance technology to replace traditional RC low pass filter, can eliminate the ripple of light modulation delay time and voltage-controlled current source control signal.
Execution mode two:
As shown in Figure 8, signal 11 is through time delay module and Logic control module, and when signal 11 is low level (in the SCR control angle), switch S 1 is opened, and S2 turn-offs, and power supply is by 1 charging of 1 pair of capacitor C of resistance R, the voltage signal 13 exponentially curves on capacitor C 1.Pulse generator 2 produces a pulse signal 12 at the rising edge (being the controlled silicon conducting moment) of signal 11, and signal 12 is input to sampling and keeps the control end of module 4, and sampling maintenance module 4 signal 13 is sampled and kept temporarily at each pulse signal.Fig. 9 is phase detecting module 1 output signal 11, LOG curve generator 3 output signals 13, and sampling keeps the graph of a relation of module 2 control signals.When the controllable silicon dimmer control phase changes, the rising edge of signal 11 is constantly along with the controllable silicon phase place changes, pulse signal 12 generations are constantly along with the variation of controllable silicon dimmer control phase, and sampling keeps the generation moment of module 4 according to pulse signal 12, to the voltage sample on capacitor C 1 and maintenance.When the controllable silicon phase place changes continuously, sampling keeps the output signal of module 4 identical with LOG curve generator 3 output signals 13, for the curve that power supply charges by 1 pair of capacitor C 1 of resistance R, therefore sampling keeps module 4 output signals 14 and the LOG curve generator 3 the same exponentially type of output signal 13 discharge curves.Sampling keeps module 4 output signals 14 to control voltage-controlled current source 5, and the gain of the voltage-controlled current source 5 of this moment is negative value, and namely the value of signal 14 is larger, and the LED output current is less, and the value of signal 14 is less, and the LED output current is larger.In conjunction with Fig. 4 and Fig. 6 as can be known, in the controllable silicon dimmer angle of flow, signal 11 is high level, the silicon controlled angle of flow is larger, and the duty ratio of signal 11 is larger, and power supply is less by the time that 1 pair of capacitor C 1 of resistance R is charged, the value of signal 14 is less, and the LED output current is just larger; Otherwise the angle of flow of controllable silicon dimmer is less, and the duty ratio of signal 11 is less, and capacitor C 1 is larger by the time of resistance R 1 charging, and the value of signal 14 is larger, and the LED output current is less.The index charging curve voltage signal of signal 14 is controlled voltage-controlled current source 5, and because the gain of voltage-controlled current source is negative value, the current curve of voltage-controlled current source 5 outputs is answered exponentially discharge-type curve, i.e. LED output current exponentially discharge-type curve.Capacitor C 1 occurs in controllable silicon dimmer by resistance R 1 charging and controls in pilot angle, the angle of flow of controllable silicon dimmer is the pilot angle that one-period π deducts controllable silicon dimmer, therefore, relation between LED output current curve and the controllable silicon dimmer angle of flow should with LED output current curve and controllable silicon dimmer pilot angle between relation become in the horizontal direction mirror, obtain as shown in Figure 9 the LED output current and the relation curve between thyristor operating angle.As shown in Figure 2 and Figure 9, the present embodiment utilizes above-mentioned exponential type discharge curve to revise LED current curve in Fig. 2, while changing thyristor operating angle is by 0 ° to 180 °, make the LED output current according to the curvilinear motion in Fig. 9, LED lamp brightness change curve in Fig. 2 is modified to linearity curve in Fig. 9 by the LOG curve, realizes the LOG curve light modulation to the LED lighting device.The utility model also utilizes sampling maintenance technology to replace traditional RC low pass filter, can eliminate the ripple of light modulation delay time and voltage-controlled current source control signal.
Described in this specification is preferred embodiments of the present utility model, and above embodiment is only in order to the technical solution of the utility model to be described but not to restriction of the present utility model.All those skilled in the art comply with design of the present utility model by the available technical scheme of logical analysis, reasoning, or a limited experiment, all should be within scope of the present utility model.
Claims (3)
1. Dimmable LED illumination driving circuit, comprise the controllable silicon dimmer and the rectifier bridge that are connected in turn on input signal, rectifier bridge output is connected to the controllable silicon phase detecting module, it is characterized in that: the output of controllable silicon phase detecting module connects the input of a pulse generator and a LOG curve generator, the output of LOG curve generator connects sampling and keeps the input of module, the output of pulse generator connects sampling and keeps the control end of module, sampling keeps the output of module to be connected to the input of voltage-controlled current source, voltage-controlled current source output connects the LED load, control the electric current in the LED load.
2. Dimmable LED illumination driving circuit according to claim 1, it is characterized in that: described LOG curve generator is that electric capacity passes through resistance charge or discharge generation voltage signal, and square wave high level or low level control that the capacitor charge and discharge time is produced by pulse generator.
3. Dimmable LED illumination driving circuit according to claim 1, it is characterized in that: the physical circuit of described LOG curve generator comprises time delay module, Logic control module, charging resistor, charging capacitor and two switches, signal input part is connected to time delay module, time delay module is connected with Logic control module, Logic control module is controlled two switches, two switches are connected between voltage and ground, middle serial connection charge resistance, charging capacitor is connected in parallel on the resistance of charging resistor and ground connection, is signal output part on charging capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203277021U CN203301821U (en) | 2013-06-07 | 2013-06-07 | Dimmable LED lighting driver circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203277021U CN203301821U (en) | 2013-06-07 | 2013-06-07 | Dimmable LED lighting driver circuit |
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| CN203301821U true CN203301821U (en) | 2013-11-20 |
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| CN2013203277021U Withdrawn - After Issue CN203301821U (en) | 2013-06-07 | 2013-06-07 | Dimmable LED lighting driver circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103260321A (en) * | 2013-06-07 | 2013-08-21 | 无锡华润矽科微电子有限公司 | Dimmable LED illumination drive circuit |
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2013
- 2013-06-07 CN CN2013203277021U patent/CN203301821U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103260321A (en) * | 2013-06-07 | 2013-08-21 | 无锡华润矽科微电子有限公司 | Dimmable LED illumination drive circuit |
| CN103260321B (en) * | 2013-06-07 | 2015-11-25 | 无锡华润矽科微电子有限公司 | A kind of Dimmable LED illumination drive circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20131120 Effective date of abandoning: 20151125 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |