CN102510618A - Semiconductor lighting driving circuit, semiconductor lighting device, and dimming method for semiconductor lighting device - Google Patents
Semiconductor lighting driving circuit, semiconductor lighting device, and dimming method for semiconductor lighting device Download PDFInfo
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Abstract
The invention relates to a semiconductor lighting driving circuit which is compatible with a thyristor dimmer and a voltage input type dimmer. The semiconductor lighting driving circuit comprises a rectification filtering circuit, a power factor correction (PFC) circuit, a control circuit and a conversion circuit, wherein the rectification filtering circuit is used for converting an alternating current which comes from an alternating current power supply into a direct current; the PFC circuit is used for performing voltage reduction on the direct current; the control circuit is used for generating a pulse width modulation (PWM) control signal according to the direct current which is subjected to voltage reduction or an output voltage of the voltage input type dimmer; and the conversion circuit is used for supplying electric energy to a semiconductor lighting device according to the PWM control signal. The semiconductor lighting driving circuit is compatible with the thyristor dimmer and the voltage input type dimmer, can steadily operate in various kinds of dimming modes, and is high in generality. The semiconductor lighting driving circuit can independently operate, and the semiconductor lighting driving circuit and other circuit modules can conveniently form a product with high cost performance. Moreover, with the PFC circuit, the electromagnetic interference of the circuit can be remarkably reduced, so that the circuit operates more steadily and more reliably.
Description
Technical field
The present invention relates to the semiconductor lighting drive circuit, particularly relate to a kind of multi-functional tunable optical semiconductor lighting drive circuit, the semiconductor illumination device that uses it and light-dimming method thereof.
Background technology
The light modulation IC (integrated circuit, surface-mounted integrated circuit) of semiconductor lighting is of a great variety at present, and spread in performance is uneven, is special-purpose light modulation IC.A kind of light modulation IC function, not high to the compatibility of input dimmer switch, also have output current or spread of voltage in addition, cause semiconductor output light unsmooth, there are phenomenons such as shake, flicker.
Summary of the invention
Based on this, be necessary to provide a kind of semiconductor lighting drive circuit that can compatible a plurality of dimmer switchs.
A kind ofly be used to the semiconductor lighting drive circuit that the semiconductor lighting device provides power supply, it comprises current rectifying and wave filtering circuit, and it is used for convert direct current output to from the alternating current that exchanges power supply; Pfc circuit, it is used for circuit power factor is proofreaied and correct and said direct current carried out step-down handle; Control circuit, it is used for producing pwm control signal according to the said direct current of handling through step-down; And change-over circuit, it is used for according to said pwm control signal the said direct current of handling through step-down being transformed to corresponding output current or voltage and exporting to said semiconductor illumination device.Wherein, the controllable silicon dimmer that passes through that current rectifying and wave filtering circuit is optional is connected to said AC power, and said galvanic voltage through the step-down processing is directly proportional with the alternating voltage of the duty ratio of stating pwm control signal with the said controllable silicon dimmer cut of process; What said control circuit was optional links to each other with the imported dimmer of voltage, and said control circuit also produces said pwm control signal according to the output voltage of the imported dimmer of said voltage.
In a preferred embodiment, when said control circuit linked to each other with the imported dimmer of voltage, the duty ratio of said pwm control signal was directly proportional with the output voltage of the imported dimmer of said voltage.
In a preferred embodiment, described semiconductor lighting drive circuit also comprises the photoelectricity coupling circuit, and what said photoelectricity coupling circuit was optional links to each other with a push-button type dimmer, and it is used for the corresponding high-low level signal of state output according to said push-button type dimmer; Said control circuit is used for producing said pwm control signal according to said direct current and the said high-low level signal of handling through step-down.
In a preferred embodiment; Said current rectifying and wave filtering circuit comprises current transformer; When said photoelectricity coupling circuit linked to each other with the push-button type dimmer, an end of the input of said photoelectricity coupling circuit linked to each other with said push-button type dimmer, and the other end links to each other with the output of said current transformer.
In a preferred embodiment, said control circuit comprises single-chip microcomputer, power supply circuits and switching tube, and said power supply circuits receive the direct current of said process step-down processing and to said single-chip microcomputer stable operating voltage are provided; First sampling end of said single-chip microcomputer links to each other with the output of said pfc circuit through resistance, passes through capacity earth simultaneously; What said first sampling end was optional links to each other with the imported dimmer of voltage; The signal output part of said single-chip microcomputer links to each other with said control end of switching tube through resistance, and first end of said switching tube links to each other with said change-over circuit as the output of said control circuit, links to each other with the output of said pfc circuit through resistance simultaneously; The second end ground connection of said switching tube.
In a preferred embodiment, said control circuit comprises single-chip microcomputer, power supply circuits and switching tube, and said power supply circuits receive the direct current of said process step-down processing and to said single-chip microcomputer stable operating voltage are provided; First sampling end of said single-chip microcomputer links to each other with the output of said pfc circuit through resistance, passes through capacity earth simultaneously; What said first sampling end was optional links to each other with the imported dimmer of voltage; Second sampling end of said single-chip microcomputer links to each other with the output of said photoelectricity coupling circuit; The signal output part of said single-chip microcomputer links to each other with said control end of switching tube through resistance, and first end of said switching tube links to each other with said change-over circuit as the output of said control circuit, links to each other with the output of said pfc circuit through resistance simultaneously; The second end ground connection of said switching tube.
In a preferred embodiment; Described semiconductor lighting drive circuit also comprises the function commutation circuit that links to each other with said change-over circuit; Said function commutation circuit is used to control the output mode of said change-over circuit, and said output mode comprises constant current mode and constant voltage mode at least.
In addition, also be necessary to provide a kind of semiconductor illumination device that can compatible a plurality of dimmer switchs, it comprises at least one LED and drive circuit thereof, and wherein this drive circuit can be above-mentioned any semiconductor lighting drive circuit.
In addition, also be necessary to provide a kind of light-dimming method of semiconductor illumination device, this method comprises: will convert direct current to from the alternating current that exchanges power supply; Circuit power factor is proofreaied and correct and said direct current carried out step-down handle; Judge whether the said direct current of handling through step-down is lower than preset value, if then produce pwm control signal according to the said direct current of handling through step-down; Judge whether to receive the magnitude of voltage of the output voltage of the imported dimmer of a response voltage, if then produce pwm control signal according to said magnitude of voltage; Judge whether to receive the high-low level signal of a reaction push-button type dimmer state, if then produce pwm control signal according to said high-low level signal; According to said pwm control signal the said direct current of handling through step-down is transformed to corresponding output current or voltage and exports to said semiconductor illumination device.
Semiconductor lighting drive circuit of the present invention can compatible silicon controlled dimmer and the imported dimmer of voltage, all can very stable operation under various light-modulating modes, and highly versatile.But this semiconductor lighting drive circuit independent operating is convenient with other circuit module composition price ratio high product.In addition, circuit of the present invention can significantly reduce the electromagnetic interference of circuit owing to possess power factor correction circuit, makes the circuit operation more stable, reliable.
Description of drawings
Fig. 1 is the schematic block circuit diagram of the semiconductor lighting drive circuit of an embodiment.
Fig. 2 is the circuit theory diagrams of the current rectifying and wave filtering circuit of an embodiment.
Fig. 3 is the schematic diagram of the pfc circuit of an embodiment.
Fig. 4 is the circuit theory diagrams of the signal acquisition circuit of an embodiment.
Fig. 5 is the circuit theory diagrams of the control circuit of an embodiment.
Fig. 6 is the circuit theory diagrams of change-over circuit, function commutation circuit and the on-line interface of an embodiment.
Embodiment
To combine specific embodiment and accompanying drawing that semiconductor lighting drive circuit of the present invention is described in further detail below.
Semiconductor lighting drive circuit of the present invention can be used for driving semiconductor illumination device, particularly has the high-power LED lighting fixture of a plurality of mutual series connection and the LED (light emitting diode, light-emitting diode) of parallel connection.
As shown in Figure 1; According to one embodiment of present invention; The semiconductor lighting drive circuit mainly comprises current rectifying and wave filtering circuit, PFC (power factor correction, power factor correction) circuit, control circuit, change-over circuit, signal acquisition circuit, on-line interface and function commutation circuit.Wherein, Selectively current rectifying and wave filtering circuit is linked to each other through the input of controllable silicon dimmer with input AC (interchange) power supply; Also selectively an imported dimmer of voltage is linked to each other with control circuit, also selectively a push-button type dimmer is linked to each other with control circuit through signal acquisition circuit.Thereby through circuit framework of the present invention, the semiconductor lighting drive circuit can the following at least three kinds of dimmers of compatibility: controllable silicon dimmer, the imported dimmer of voltage and push-button type dimmer.
Wherein, controllable silicon dimmer can be the existing controllable silicon dimmer that is applied to conventional incandescent.The imported dimmer of voltage can be one and operates output particular range voltage signal, the for example dimmer of 0-10V voltage according to the user.The push-button type dimmer can be a normal start tool key switch, and switch is for often leaving under the normal condition, and artificial pressing is conducting, unclamps i.e. disconnection, and the time length of pressing through button is controlled the brightness and the light on and off of light.
Current rectifying and wave filtering circuit is mainly used in and converts the alternating current from AC power supplies to direct current Vin, can also be used to decay from the electromagnetic interference of going to AC power supplies.Current rectifying and wave filtering circuit can adopt circuit framework commonly used at present; Such as but not limited to comprise the fuse F 1 that is positioned at input, filter capacitor C1, with current transformer L1, rectification module (like the full-bridge rectification chip) U1 that links to each other with current transformer L1 and the filter capacitor C2 that is connected in parallel on rectification module U1 output of capacitor C 1 parallel connection, as shown in Figure 2.Fuse F 1 can be through controllable silicon dimmer or is directly linked to each other with the live wire end L of the input of AC power supplies, and filter capacitor C1 directly links to each other with the zero line side N of the input of AC power supplies.
Pfc circuit is used for circuit power factor is proofreaied and correct and the direct current Vin of current rectifying and wave filtering circuit output carried out step-down handle output DC V+.Wherein direct current V+ changes with the variation of direct current Vin.In the present embodiment, direct current V+ is directly proportional with direct current Vin.In the present embodiment, adopt as shown in Figure 3 have high power factor, cost performance is high, output is stable single-stage pfc circuit, it mainly comprises control chip U2, switching tube Q1 and transformer T1.Control chip U2 changes direct current Vin into the direct current V+ of expectation through the work of the logical and disconnected control transformer T1 of control switch pipe Q1.
Signal acquisition circuit can link to each other with the push-button type dimmer, is used to detect the on off state of push-button type dimmer, and the signal of output-response push-button type dimmer switch state.In the present embodiment, adopt a photoelectricity coupling circuit as shown in Figure 4 as signal acquisition circuit, it prevents effectively that according to the corresponding high-low level signal Vf1 of state output of push-button type dimmer the electromagnetic interference of input is sent to control circuit.This photoelectricity coupling circuit mainly comprises an integrated photoelectrical coupler U3; One end of the input of this photoelectrical coupler U3 links to each other with the push-button type dimmer, the other end links to each other with the output of the current transformer of current rectifying and wave filtering circuit; One end ground connection of its output, the other end is to control circuit output high-low level signal Vf1.Among other embodiment, can be without signal acquisition circuit, the output of push-button type dimmer is connected directly to control circuit.
Control circuit is used for producing corresponding PWM (Pulse Width Modulation, pulse width modulation) control signal (being labeled as Vp) according to the output voltage (being labeled as Vf2) of direct current V+ or the imported dimmer of voltage or high-low level signal Vf1.In the present embodiment, control circuit is judged whether place in circuit of controllable silicon dimmer according to direct current V+.When controllable silicon dimmer is connected between the live wire of current rectifying and wave filtering circuit and AC power supplies; Controllable silicon dimmer carries out cut and exports tangential voltage the AC voltage of input; Vin and this cut voltage that current rectifying and wave filtering circuit produces are proportional basically, thereby the direct current V+ of pfc circuit output is directly proportional with this tangential voltage basically.Control circuit produces the pwm signal Vp that duty ratio is directly proportional with this phase angle according to the phase angle that direct current V+ judges the controllable silicon dimmer cut.When control circuit detects the output voltage V f2 of the imported dimmer of voltage, produce the pwm signal Vp that duty ratio is directly proportional with voltage Vf2.When control circuit detects high-low level signal Vf1, can produce the pwm signal Vp of corresponding duty ratio according to setting program.
As shown in Figure 5, the control circuit of present embodiment mainly comprises single-chip microcomputer U4, power supply circuits, sampling unit and switching tube Q2.Power supply circuits mainly utilize voltage-stabiliser tube D1 and resistance R 3 for single-chip microcomputer U4 provides stable operating voltage, make the single-chip microcomputer U4 can operate as normal.Sampling unit comprises the series arm that is made up of resistance R 1, R2 and capacitor C 3.Wherein an end of resistance R 1 links to each other with the output of pfc circuit, and the other end links to each other with an end of capacitor C 3 through resistance R 2.One end of capacitor C 3 links to each other its other end ground connection as sampling end with first sampling end (being to be marked at 2 pin in the single-chip microcomputer U4 among Fig. 5) of single-chip microcomputer U4.First sampling end also can link to each other with the imported dimmer of voltage selectively.Second sampling end of single-chip microcomputer U4 (being to be marked at 3 pin in the single-chip microcomputer U4 among Fig. 5) links to each other with signal acquisition circuit, receives the high-low level signal Vf1 that represents push-button type dimmer state from signal acquisition circuit.Switching tube Q2 can be triode, IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) or MOS (Metal-Oxid-Semiconductor, Metal-oxide-semicondutor) transistor.The control end that the signal output part of single-chip microcomputer U4 (being to be marked at 6 pin in the single-chip microcomputer U4 among Fig. 5) passes through resistance and switching tube Q2 is (like the base stage of triode; The grid of IGBT or metal-oxide-semiconductor) links to each other; First end of switching tube Q2 is (like the collector electrode of triode; The drain electrode of IGBT or metal-oxide-semiconductor) exports pwm control signal Vp as the output of control circuit to change-over circuit, link to each other with the output of pfc circuit through resistance simultaneously.Second end of switching tube Q2 (like the emitter of triode, the source electrode of IGBT or metal-oxide-semiconductor) ground connection.
Through single-chip microcomputer U4 is programmed; Can realize: when controllable silicon dimmer is adopted when circuit in (1); By the sampling of first sampling end of single-chip microcomputer U4, single-chip microcomputer U4 produces the pwm signal Vp that duty ratio is directly proportional with the phase angle of controllable silicon dimmer cut according to program to the direct current V+ that is particular kind of relationship with the phase angle of controllable silicon dimmer cut through sampling unit.So, when being 0-100%, can realize the 0-100% dimming function as if duty ratio.
(2) when circuit adopts the imported dimmer of voltage, by the sampling of first sampling end of single-chip microcomputer U4, single-chip microcomputer U4 produces the pwm signal Vp that duty ratio is directly proportional with voltage Vf2 according to program to the output voltage V f2 of the imported dimmer of voltage through sampling unit.So, when being 0-100%, can realize the 0-100% dimming function as if duty ratio.
(3) when circuit adopts the push-button type dimmer, second sampling end of single-chip microcomputer U4 samples corresponding high-low level signal Vf1.When the switch of push-button type dimmer is clicked (for example less than 20ms) fast; This signal of single-chip microcomputer U4 decidable is for turning on light or closing modulating signal; Be output as duty ratio and be 0% or be among other embodiment of pwm control signal (, clicking rule again) of 100%, can be designed to: click output duty cycle and be 10% pwm control signal into closing promptly according to clicking to opening; Click output duty cycle again and be 50% pwm control signal, by that analogy.When the switch of push-button type dimmer is often pressed (for example greater than 1S); This signal of single-chip microcomputer U4 decidable is a pattern with an automatic light meter, the pulsewidth of the exportable gradual change of single-chip microcomputer, and the duty ratio that makes pwm control signal is by 0 to 100%; Again by 100% to 0; Go round and begin again, any one middle time point is judged when the switch of push-button type dimmer is released, is kept the pwm control signal of current output.Thereby can realize the 0-100% dimming function.
Those skilled in the art are easy to expect that among other embodiment, single-chip microcomputer U4 different sampling end capable of using is discerned controllable silicon dimmer and the imported dimmer of voltage respectively.
Change-over circuit is used for the driving LED load, and it is to be converted into the required various voltages of LED load and the drive circuit of electric current according to the direct current V+ that pwm control signal Vp will import it, realizes various brightness demands.Among one embodiment, change-over circuit is shown in the circuit outside the square frame among Fig. 6, and it mainly realizes its function through a DC-DC transducer U5.
In the present embodiment, the semiconductor lighting drive circuit also comprises a function commutation circuit that links to each other with change-over circuit.When circuit need not use dimmer, this function commutation circuit capable of using realized the constant current and the constant voltage driving function of LED load.As shown in Figure 6, the function commutation circuit mainly comprises encoder (for example 8421 encoders) U6 and the resistance of coupled different resistances and the voltage-stabiliser tube of different voltage stabilizing values.Under the various combination of encoder U6, can obtain the output constant current value that different resistance values is set DC-DC transducer U5.With 8 section 8421 encoder is example, can realize 28 kinds of (256 kinds) output current values in theory, in the practical application, the value of several needs only is set generally.Similar with constant current mode, through disposing different voltage-stabiliser tubes, can realize the constant voltage function of different output voltage.
It may occur to persons skilled in the art that, connect an on-line interface (see figure 6), can realize many drive circuits purpose of brightness adjustment control simultaneously through output at control circuit.When many drive circuit collaborative works, can shared current rectifying and wave filtering circuit, pfc circuit, signal acquisition circuit and control circuit.
To sum up; Semiconductor lighting drive circuit of the present invention has following advantage: 1. can at least three kinds of main flow dimmers of compatibility; The user can select use different dimmers according to actual conditions, all can very stable level and smooth light modulation under various light-modulating modes, there are not shake and flicker; 2. circuit of the present invention can significantly reduce the electromagnetic interference of circuit owing to possess power factor correction circuit, makes the circuit operation more stable, reliable; 3. under the considerably less condition of cost of increase, can have multiple constant voltage and constant current mode, highly versatile simultaneously; 4. through increasing on-line interface, also can realize a many group of dimmer control load etc.; 5. under the complete immovable situation of hardware, the later stage can also be revised software through upgrade port, realizes the upgrading (please give an example) of function; 6. through current rectifying and wave filtering circuit and pfc circuit, realize that the safety of input and output is isolated; 7. each module all can adopt general module or general purpose I C in the circuit, and supplier's foot of supplying is got the raw materials ready conveniently, and cost is low; If adopt the SMD element, can make things convenient for mechanization production, reduce labor cost.
In addition; But the each several part independent operating of semiconductor lighting drive circuit; Convenient with other circuit module composition price ratio high product; For example: 1) when the constant voltage that only needs high power factor or constant current output, not welding control circuit and brightness adjustment control part during production directly are exactly individual constant voltage or constant-current supply cheaply; When 2) only needing single dimming function, hardware can not revised or corresponding light adjusting circuit element does not weld, and revises software and can realize simple function, and convenient and practical, improvement cost is 0; 3) owing to adopt Single-chip Controlling, this power supply can also expand to the independent control of brightening Landscape Lighting, behind the update routine, can realize the functions such as saltus step, gradual change, flowing water of light, and upgrading is convenient; Through reserving communication interface, later scalable be DMX512 and following CAN agreement.
Among one embodiment, the light-dimming method of semiconductor illumination device comprises step:
To convert direct current to from the alternating current that exchanges power supply;
Circuit power factor is proofreaied and correct and said direct current carried out step-down handle;
Judge whether the said direct current of handling through step-down is lower than preset value (the controllable silicon cut causes actual input voltage to reduce), if then produce pwm control signal according to the said direct current of handling through step-down;
Judge whether to receive the magnitude of voltage of the output voltage of the imported dimmer of a response voltage, if then produce pwm control signal according to said magnitude of voltage;
Judge whether to receive the high-low level signal of a reaction push-button type dimmer state, if then produce pwm control signal according to said high-low level signal;
According to said pwm control signal the said direct current of handling through step-down is transformed to corresponding output current or voltage and exports to said semiconductor illumination device.
The above embodiment has only expressed several kinds of execution modes of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the present invention's design, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with accompanying claims.
Claims (9)
1. a semiconductor lighting drive circuit is used to the semiconductor lighting device power supply is provided, and it is characterized in that said drive circuit comprises:
Current rectifying and wave filtering circuit, it is used for convert direct current output to from the alternating current that exchanges power supply;
Pfc circuit, it is used for circuit power factor is proofreaied and correct and said direct current carried out step-down handle;
Control circuit, it is used for producing pwm control signal according to the said direct current of handling through step-down; And
Change-over circuit, it is used for according to said pwm control signal the said direct current of handling through step-down being transformed to corresponding output current or voltage and exporting to said semiconductor illumination device;
Wherein, the controllable silicon dimmer that passes through that current rectifying and wave filtering circuit is optional is connected to said AC power, and said galvanic voltage through the step-down processing is directly proportional with the alternating voltage of the duty ratio of stating pwm control signal with the said controllable silicon dimmer cut of process; What said control circuit was optional links to each other with the imported dimmer of voltage, and said control circuit also produces said pwm control signal according to the output voltage of the imported dimmer of said voltage.
2. semiconductor lighting drive circuit according to claim 1 is characterized in that, when said control circuit linked to each other with the imported dimmer of voltage, the duty ratio of said pwm control signal was directly proportional with the output voltage of the imported dimmer of said voltage.
3. semiconductor lighting drive circuit according to claim 1; It is characterized in that; Also comprise the photoelectricity coupling circuit, what said photoelectricity coupling circuit was optional links to each other with a push-button type dimmer, and it is used for the corresponding high-low level signal of state output according to said push-button type dimmer; Said control circuit is used for producing said pwm control signal according to said direct current and the said high-low level signal of handling through step-down.
4. semiconductor lighting drive circuit according to claim 3; It is characterized in that; Said current rectifying and wave filtering circuit comprises current transformer; When said photoelectricity coupling circuit linked to each other with the push-button type dimmer, an end of the input of said photoelectricity coupling circuit linked to each other with said push-button type dimmer, and the other end links to each other with the output of said current transformer.
5. semiconductor lighting drive circuit according to claim 1; It is characterized in that; Said control circuit comprises single-chip microcomputer, power supply circuits and switching tube, and said power supply circuits receive the direct current of said process step-down processing and to said single-chip microcomputer stable operating voltage are provided; First sampling end of said single-chip microcomputer links to each other with the output of said pfc circuit through resistance, passes through capacity earth simultaneously; What said first sampling end was optional links to each other with the imported dimmer of voltage; The signal output part of said single-chip microcomputer links to each other with said control end of switching tube through resistance, and first end of said switching tube links to each other with said change-over circuit as the output of said control circuit, links to each other with the output of said pfc circuit through resistance simultaneously; The second end ground connection of said switching tube.
6. semiconductor lighting drive circuit according to claim 3; It is characterized in that; Said control circuit comprises single-chip microcomputer, power supply circuits and switching tube, and said power supply circuits receive the direct current of said process step-down processing and to said single-chip microcomputer stable operating voltage are provided; First sampling end of said single-chip microcomputer links to each other with the output of said pfc circuit through resistance, passes through capacity earth simultaneously; What said first sampling end was optional links to each other with the imported dimmer of voltage; Second sampling end of said single-chip microcomputer links to each other with the output of said photoelectricity coupling circuit; The signal output part of said single-chip microcomputer links to each other with said control end of switching tube through resistance, and first end of said switching tube links to each other with said change-over circuit as the output of said control circuit, links to each other with the output of said pfc circuit through resistance simultaneously; The second end ground connection of said switching tube.
7. semiconductor lighting drive circuit according to claim 1; It is characterized in that; Also comprise the function commutation circuit that links to each other with said change-over circuit, said function commutation circuit is used to control the output mode of said change-over circuit, and said output mode comprises constant current mode and constant voltage mode at least.
8. a semiconductor illumination device comprises at least one LED and drive circuit thereof, it is characterized in that said drive circuit is for like each described semiconductor lighting drive circuit in the claim 1 to 7.
9. the light-dimming method of a semiconductor illumination device comprises:
To convert direct current to from the alternating current that exchanges power supply;
Circuit power factor is proofreaied and correct and said direct current carried out step-down handle;
Judge whether the said direct current of handling through step-down is lower than preset value, if then produce pwm control signal according to the said direct current of handling through step-down;
Judge whether to receive the magnitude of voltage of the output voltage of the imported dimmer of a response voltage, if then produce pwm control signal according to said magnitude of voltage;
Judge whether to receive the high-low level signal of a reaction push-button type dimmer state, if then produce pwm control signal according to said high-low level signal;
According to said pwm control signal the said direct current of handling through step-down is transformed to corresponding output current or voltage and exports to said semiconductor illumination device.
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| CN103298220A (en) * | 2013-07-01 | 2013-09-11 | 尹满桥 | Light-emitting diode (LED) lamp modulator compatible with thyristor or common switch AC input |
| CN103840646A (en) * | 2012-11-23 | 2014-06-04 | 南京博兰得电子科技有限公司 | Resonant converting device |
| CN105722278A (en) * | 2016-04-11 | 2016-06-29 | 上海晶丰明源半导体有限公司 | Control circuit and control method for improving LED dimming performance, and LED driving system |
| CN106793351A (en) * | 2017-03-29 | 2017-05-31 | 珠海市圣昌电子有限公司 | A kind of wide input voltage phase-cut dimming power supply |
| CN112083747A (en) * | 2020-06-30 | 2020-12-15 | 海益（厦门）建材工业有限公司 | Heating control method and device for inhibiting flicker interference |
| CN114071837A (en) * | 2020-08-07 | 2022-02-18 | 全汉企业股份有限公司 | Lighting power supply circuit with dimming function and control method thereof |
| CN115334717A (en) * | 2022-10-13 | 2022-11-11 | 江苏晨阳电光源有限公司 | Car light intelligent control circuit based on photoelectric coupler |
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