CN203467002U - LED constant-current power supply - Google Patents
LED constant-current power supply Download PDFInfo
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- CN203467002U CN203467002U CN201320369653.8U CN201320369653U CN203467002U CN 203467002 U CN203467002 U CN 203467002U CN 201320369653 U CN201320369653 U CN 201320369653U CN 203467002 U CN203467002 U CN 203467002U
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Abstract
The utility model relates to the technical field of power supplies and particularly relates to an LED constant-current power supply. The LED constant-current power supply comprises a silicon controlled rectifier dimmer of which the input end is connected with an alternating-current power supply voltage and the output end is connected with a rectifier and filter circuit. A signal output end of the rectifier and filter circuit is connected with a current stabilization circuit. The current stabilization circuit has a control signal input end which is connected with a control circuit used for generating a control signal according to a reference voltage. The current stabilization circuit outputs a direct-current power supply voltage for supplying an adjustable drive power supply to an LED. According to the LED constant-current power supply, current output is stably controlled by a phase angle output by the silicon controlled rectifier dimmer so that an LED dimming effect can be achieved and both linear dimming and flexible dimming on the LED can be realized.
Description
Technical field
The utility model relates to power technique fields, relates in particular to a kind of LED power supply.
Background technology
The existing light regulating technology for ordinary light source (incandescent lamp) is mainly the light modulation of controllable silicon phase-modulation, at actual light modulation scene, has extensive application.LED illumination obtains using more and more widely owing to having a series of advantage, yet the LED mains lighting supply of the existing controllable silicon dimmer design based on traditional exists half-light unstable, has the problems such as point of scintillation and light modulation be irregular in light modulation process.
Utility model content
The purpose of this utility model is, a kind of LED constant-current supply is provided, and solves above technical problem.The technical problem that the utility model solves can realize by the following technical solutions:
A LED constant-current supply, wherein, comprises a controllable silicon dimmer, and the input of described controllable silicon dimmer connects AC supply voltage, and the output of described controllable silicon dimmer connects a current rectifying and wave filtering circuit; The signal output part of described current rectifying and wave filtering circuit connects a current stabilization circuit; Described current stabilization circuit is provided with a control signal input, and described control signal input connects a control circuit for generation of control signal;
Described current stabilization circuit output is used to LED that the DC power supply voltage of adjustable driving power is provided.
Preferably, described current rectifying and wave filtering circuit comprises a rectification circuit, a filter circuit, and the output of described rectification circuit connects described filter circuit; Described rectification circuit is for being transformed to direct current by alternating current; Described filter circuit is for the ripple of elimination Output Voltage in Rectified Circuits.
Preferably, described rectification circuit also connects a voltage stabilizing circuit, and described voltage stabilizing circuit is provided with one for offering the signal output part of control circuit phase information, and described signal output part connects described control circuit.
Preferably, between described current rectifying and wave filtering circuit and described current stabilization circuit, be provided with DC-DC voltage transformation module.
Preferably, described DC-DC voltage transformation module adopts a booster circuit.
Preferably, described filter circuit comprises a diode and the electrochemical capacitor of connecting with described diode, the anode of described diode is connected with the output of described rectification circuit, the negative electrode of described diode and the anodic bonding of described electrochemical capacitor, the minus earth of described electrochemical capacitor.
Preferably, described rectification circuit adopts bridge rectifier.
Preferably, described voltage stabilizing circuit comprises a current-limiting resistance and the voltage-stabiliser tube of connecting with described current-limiting resistance, between described current-limiting resistance and described voltage-stabiliser tube, draws described signal output part.
Preferably, described control circuit comprises a microprocessor, and described microprocessor is provided with at least two input/output ports, the signal output part of described voltage stabilizing circuit connect one described in input/output port; Described microprocessor connects a signal processing unit by input/output port described in another;
Described microprocessor also connects a memory cell, described memory cell contains light modulation phase angle and corresponding Linear Control current value, the signal that described microprocessor is inputted by signal output part records light modulation phase angle, and obtains Linear Control current value by described storage unit query; The conditioning signal of a corresponding duty ratio of described microprocessor output is given described signal processing unit, connects the control signal input of described current stabilization circuit in order to control LED drive current size by described signal processing unit.
Preferably, described signal processing unit comprises a RC filter unit and the operation amplifier unit being connected with described RC filter unit.
Preferably, described control circuit adopts the control circuit being comprised of a RC filter unit and the operation amplifier unit that is connected with described RC filter unit, and the signal output part of described voltage stabilizing circuit connects the signal input part of described RC filter unit.
Beneficial effect: owing to adopting above technical scheme, stable its electric current of controlling in phase angle that the utility model is exported by controllable silicon dimmer is exported, and reaches the dimming effect to LED, and can realize the linearity light adjusting of LED and flexible light modulation.
Accompanying drawing explanation
Fig. 1 is circuit connection diagram of the present utility model;
Fig. 2 is the output voltage waveform of AC supply voltage of the present utility model after controllable silicon dimmer;
Fig. 3 is the output voltage waveform of AC supply voltage of the present utility model after bridge rectifier;
Fig. 4 is the voltage oscillogram of the input signal of control circuit of the present utility model;
Fig. 5 is a kind of electrical block diagram of control circuit of the present utility model;
Fig. 6 is the another kind of electrical block diagram of control circuit of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail, but not as restriction of the present utility model.
With reference to Fig. 1, a kind of LED constant-current supply, comprises a controllable silicon dimmer 1, and the input of controllable silicon dimmer 1 connects AC supply voltage (VAC), and the output of controllable silicon dimmer 1 connects a current rectifying and wave filtering circuit; The signal output part of current rectifying and wave filtering circuit connects a current stabilization circuit 5; Current stabilization circuit 5 is provided with a control signal input, and control signal input connects a control circuit 6 for generation of control signal; Current stabilization circuit 5 output DC power supply voltages are used to LED that adjustable driving power is provided.
Current rectifying and wave filtering circuit comprises a rectification circuit 2, a filter circuit 3, and the output of rectification circuit 2 connects filter circuit 3; Rectification circuit 2 also connects a voltage stabilizing circuit 7, the voltage-stabiliser tube (Z1) that voltage stabilizing circuit 7 comprises a current-limiting resistance (R1) and connects with current-limiting resistance, between current-limiting resistance and voltage-stabiliser tube, draw for offering the signal output part of control circuit phase information, signal output part connects control circuit 6.Rectification circuit 2 is for being transformed to direct current by alternating current; Rectification circuit 2 can adopt bridge rectifier 2.Filter circuit 3 is for the ripple of elimination rectification circuit 2 output voltages, the electrochemical capacitor (E1) that filter circuit 3 can comprise a diode (D1) and connect with diode, the anode of diode is connected with the output of rectification circuit 2, the negative electrode of diode and the anodic bonding of electrochemical capacitor, the minus earth of electrochemical capacitor.Further, between current rectifying and wave filtering circuit 3 and current stabilization circuit 5, be provided with DC-DC voltage transformation module.DC-DC voltage transformation module adopts a booster circuit 4.
During work, AC supply voltage (VAC) is exported a voltage waveform as shown in Figure 2 after controllable silicon dimmer 1, after bridge rectifier, at A point, obtains waveform (establishing G point is with reference to zero potential) as shown in Figure 3.The electrochemical capacitor of filter circuit 3 adopts big capacity electrolyte capacitor, and due to the isolation of diode, so the voltage that C is ordered is approximately stable direct current, numerical value is about the peak value (Vc) of waveform in Fig. 3.A point voltage is after current-limiting resistance current limliting and voltage-stabiliser tube amplitude limit, at F point, obtain waveform as shown in Figure 4, wherein the relative AC supply voltage (VAC) of the peak value of the waveform shown in Fig. 4 (Vz1) is an a small amount of, so be a square wave in figure, its duty ratio has directly reflected the conduction phase angle of controllable silicon dimmer 1 output
the square wave of Fig. 4 is exported a control simulation amount after control circuit 6, in order to control the output current size of current stabilization circuit 5, thereby realizes the light modulation of LED light source.
In Fig. 1, booster circuit 4 adopts switching mode booster circuit to realize, and D point voltage can be stabilized in the peak-peak place of input voltage (VAC).In Fig. 1, current stabilization circuit 5 adopts switching mode current stabilization circuit to realize, and its output current size is controlled by E point voltage size.
Control circuit 6 can adopt above circuit to realize: with reference to Fig. 5, control circuit 6 comprises a microprocessor 61, and microprocessor 61 is provided with at least two input/output ports, and the signal output part of voltage stabilizing circuit 7 connects an input/output port; Microprocessor 61 connects a signal processing unit by another input/output port; Signal processing unit can comprise a RC filter unit 62 and the operation amplifier unit 63 being connected with RC filter unit 62.Microprocessor 61 comprises a memory cell, memory cell contains light modulation phase angle and corresponding Linear Control current value, the signal that microprocessor 61 is inputted by signal output part records light modulation phase angle, and obtains Linear Control current value by storage unit query; The conditioning signal of a corresponding duty ratio of microprocessor 61 outputs, to signal processing unit, connects the control signal input of current stabilization circuit in order to control LED drive current size by signal processing unit.This control mode not only can realize the Linear Control of light output, can also realize flexible light modulation by controlling software algorithm, can arbitrarily control the speed of response of light modulation, with illuminance abrupt variation and the fluctuation of avoiding extraneous factor to cause.
Can also be by by 61 short circuits of the microprocessor in Fig. 5, the signal that F order is without microprocessor 61, outputs signal to current stabilization circuit 5 after directly sending into RC filter unit 62, big or small in order to control LED drive current.This is kind of a simple control mode, can realize LED by the stable light modulation secretly starting, but the light modulation position of dimmer and the light of LED is exported non-linear relation, thereby the circuit structure shown in preferred Fig. 5,
The foregoing is only the utility model preferred embodiment; not thereby limit execution mode of the present utility model and protection range; to those skilled in the art; should recognize that being equal to that all utilization the utility model specifications and diagramatic content done replace and the resulting scheme of apparent variation, all should be included in protection range of the present utility model.
Claims (10)
1. a LED constant-current supply, is characterized in that, comprises a controllable silicon dimmer, and the input of described controllable silicon dimmer connects AC supply voltage, and the output of described controllable silicon dimmer connects a current rectifying and wave filtering circuit; The signal output part of described current rectifying and wave filtering circuit connects a current stabilization circuit; Described current stabilization circuit is provided with a control signal input, and described control signal input connects a control circuit for generation of control signal;
Described current stabilization circuit output is used to LED that the DC power supply voltage of adjustable driving power is provided.
2. a kind of LED constant-current supply according to claim 1, is characterized in that, described current rectifying and wave filtering circuit comprises a rectification circuit, a filter circuit, and the output of described rectification circuit connects described filter circuit.
3. a kind of LED constant-current supply according to claim 2, it is characterized in that, described rectification circuit also connects a voltage stabilizing circuit, and described voltage stabilizing circuit is provided with one for offering the signal output part of control circuit phase information, and described signal output part connects described control circuit.
4. a kind of LED constant-current supply according to claim 3, is characterized in that, is provided with DC-DC voltage transformation module between described current rectifying and wave filtering circuit and described current stabilization circuit.
5. a kind of LED constant-current supply according to claim 2, it is characterized in that, described filter circuit comprises a diode and the electrochemical capacitor of connecting with described diode, the anode of described diode is connected with the output of described rectification circuit, the negative electrode of described diode and the anodic bonding of described electrochemical capacitor, the minus earth of described electrochemical capacitor.
6. a kind of LED constant-current supply according to claim 2, is characterized in that, described rectification circuit adopts bridge rectifier.
7. a kind of LED constant-current supply according to claim 3, is characterized in that, described voltage stabilizing circuit comprises a current-limiting resistance and the voltage-stabiliser tube of connecting with described current-limiting resistance, between described current-limiting resistance and described voltage-stabiliser tube, draws described signal output part.
8. a kind of LED constant-current supply according to claim 3, it is characterized in that, described control circuit comprises a microprocessor, and described microprocessor is provided with at least two input/output ports, the signal output part of described voltage stabilizing circuit connect one described in input/output port; Described microprocessor connects a signal processing unit by input/output port described in another;
Described microprocessor comprises a memory cell, and described memory cell contains light modulation phase angle and corresponding Linear Control current value.
9. a kind of LED constant-current supply according to claim 8, is characterized in that, described signal processing unit comprises a RC filter unit and the operation amplifier unit being connected with described RC filter unit.
10. a kind of LED constant-current supply according to claim 3, it is characterized in that, described control circuit adopts the control circuit being comprised of a RC filter unit and the operation amplifier unit that is connected with described RC filter unit, and the signal output part of described voltage stabilizing circuit connects the signal input part of described RC filter unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320369653.8U CN203467002U (en) | 2013-06-25 | 2013-06-25 | LED constant-current power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320369653.8U CN203467002U (en) | 2013-06-25 | 2013-06-25 | LED constant-current power supply |
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| CN203467002U true CN203467002U (en) | 2014-03-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320369653.8U Expired - Fee Related CN203467002U (en) | 2013-06-25 | 2013-06-25 | LED constant-current power supply |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104254162A (en) * | 2013-06-25 | 2014-12-31 | 华东理工大学 | An LED constant current power supply |
| CN104930384A (en) * | 2015-07-01 | 2015-09-23 | 上海顿格电子贸易有限公司 | LED lamp |
| CN104948958A (en) * | 2015-07-01 | 2015-09-30 | 上海顿格电子贸易有限公司 | LED lamp achieving current limiting by means of thermistor |
| TWI692991B (en) * | 2019-05-06 | 2020-05-01 | 東貝光電科技股份有限公司 | Flicker-free linear led drive circuit |
-
2013
- 2013-06-25 CN CN201320369653.8U patent/CN203467002U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104254162A (en) * | 2013-06-25 | 2014-12-31 | 华东理工大学 | An LED constant current power supply |
| CN104254162B (en) * | 2013-06-25 | 2019-04-02 | 华东理工大学 | A kind of LED constant current power supply |
| CN104930384A (en) * | 2015-07-01 | 2015-09-23 | 上海顿格电子贸易有限公司 | LED lamp |
| CN104948958A (en) * | 2015-07-01 | 2015-09-30 | 上海顿格电子贸易有限公司 | LED lamp achieving current limiting by means of thermistor |
| TWI692991B (en) * | 2019-05-06 | 2020-05-01 | 東貝光電科技股份有限公司 | Flicker-free linear led drive circuit |
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Granted publication date: 20140305 |