CN103687217A - Switching and dimming LED driving circuit - Google Patents
Switching and dimming LED driving circuit Download PDFInfo
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- CN103687217A CN103687217A CN201310629194.7A CN201310629194A CN103687217A CN 103687217 A CN103687217 A CN 103687217A CN 201310629194 A CN201310629194 A CN 201310629194A CN 103687217 A CN103687217 A CN 103687217A
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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
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- 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 invention relates to a switching and dimming LED driving circuit which comprises a power supply switching counting and timing circuit. The power supply switching counting and timing circuit calculates on-off times and time of an input alternating-current power supply, namely a mains supply; signals are distinguished whether to be normal switching signals or dimming control signals, if the signals are the dimming control signals, output current value regulation is performed on a driving part of an LED, and a corresponding PWM (pulse width modulation) signal or reference voltage value is generated and given to the LED constant-current driving circuit with a dimming circuit so as to realize dimming without changing any existing wiring and without a remote control. Moreover, the on-off times basically have no influence on service life and lumen flux maintenance of an LED light source. The switching and dimming LED driving circuit has great advantages in terms of cost and convenience, and is easy for wide use.
Description
Technical field
The present invention relates to LED lighting technical field, particularly relate to a kind of switch dimming LED drive circuit.
Background technology
LED illumination has started generally to use, the new illumination trend that belongs to environmental protection and energy saving, and in the dimming mode of LED illumination, have analog voltage to control light modulation, there is digital control light modulation, there is infrared or wireless remotely-controlled light modulation, potentiometer light modulation etc., however the need that these dimming modes have are changed existing wire laying mode, have plenty of tyre remote controller etc., to application, make troubles.
Summary of the invention
The shortcoming of prior art, the object of the present invention is to provide a kind of switch dimming LED drive circuit in view of the above, for solving the defect of existing LED dimming mode inconvenience.
For achieving the above object and other relevant objects, the invention provides a kind of switch dimming LED drive circuit, comprising: filter rectification and EMI circuit, power on/off testing circuit, mains switch counting and timing circuit, dimming control signal generative circuit, power factor circuit, power supply circuits, there is the LED constant-current drive circuit of light adjusting circuit; Wherein, described filter rectification and EMI circuit input end sub-connection are in AC power, and described filter rectification and EMI circuit output end are connected in to a DC lead-out terminal through described power factor circuit; The lead-out terminal of described filter rectification and EMI circuit is connected in described mains switch counting and timing circuit through described power on/off testing circuit; Wherein, described mains switch counting and timing circuit, for calculating the break-make number of times that meets default each make-and-break time interval condition of described AC power; Described mains switch counting and timing circuit are connected in described dimming control signal generative circuit, and described dimming control signal generative circuit is connected in the light adjusting circuit of described LED constant-current drive circuit; Wherein, when the break-make number of times that mains switch is counted and timing circuit calculates meets default light modulation condition, described dimming control signal generative circuit sends the dimming control signal of corresponding described light modulation condition to described light adjusting circuit; Described power supply circuits are connected in described DC lead-out terminal, and described power supply circuits comprise and are powered at the first internal power supply of described power factor circuit and are powered at described mains switch counting and the second internal power supply of timing circuit, dimming control signal generative circuit; Described DC lead-out terminal is connected in described LED constant-current drive circuit so that LED light source is powered.
Preferably, described filter rectification and EMI circuit comprise: fire line terminal L, zero terminal N, filter F1, piezo-resistance VDR, EMI electromagnetic shielding device, rectifier bridge BR1; Described filter is connected in described zero terminal; Described filter, piezo-resistance, EMI electromagnetic shielding device, rectifier bridge are connected in parallel between described fire line terminal and zero terminal; The DC output cathode of described rectifier bridge is connected in described DC lead-out terminal, described rectifier bridge DC output negative pole ground connection.
Preferably, described power on/off testing circuit comprises: resistance R 1, resistance R 2, the negative pole that is connected serially to successively ground connection from the lead-out terminal of described filter rectification and EMI circuit connects the voltage-stabiliser tube Z1 of described R2 and be connected in the resistance R 3 of Z1 positive pole; Wherein, described mains switch counting and timing circuit have the detection terminal being connected between described Z1 positive pole and R3.
Preferably, it is upper that described mains switch counting and timing circuit, dimming control signal generative circuit are integrated in same device U3, and described U3 connects capacitor C 3, capacitor C 4 and described detection terminal; Wherein, described C3 one end connects described detection terminal, and the other end is by grounding through resistance, and described U3 comprises analog to digital converter or the voltage comparator that is connected in described detection terminal; Described the second internal power supply is connected in the power input of described U3; The power input of described U3 is by C4 ground connection; Wherein, described U3 detects the magnitude of voltage on C3, and described detection magnitude of voltage is during lower than predetermined threshold value, by described mains switch, counts and timing circuit calculates whether meet default each make-and-break time interval condition, if count described break-make number of times.
Preferably, the first internal power supply of described power supply circuits is 15V voltage source, and described the second internal power supply is that described the first internal power supply is through the 5V voltage source of transformation output.
Preferably, described U3 also comprises the memory that connects described analog to digital converter or voltage comparator, and described memory is at least for storing: described default each make-and-break time interval condition, break-make number of times, default light modulation condition and corresponding dimming control signal.
Preferably, described default each make-and-break time interval condition refers to and disconnects described AC power to the time interval that next time connects AC power and be not more than 5 seconds.
Preferably, described default light modulation condition refers to a plurality of preset times values and the dimming control signal corresponding from different light modulation brightness values; The break-make number of times calculating when described mains switch counting and timing circuit with one of them preset times value at once, by described dimming control signal generative circuit become next life corresponding dimming control signal extremely described light adjusting circuit with the brightness values by corresponding, carry out light modulation.
Preferably, described power supply circuits also comprise storage capacitor C8, and the positive pole of described C8 connects described DC output, minus earth, for when described AC power disconnects to described mains switch counting and timing circuit, the power supply of dimming control signal generative circuit.
Preferably, described power supply circuits also comprise storage capacitor C9, and the positive pole of described C9 is connected in described DC lead-out terminal through diode D3, the resistance R 18 of Opposite direction connection; Described power supply circuits comprise power supply control device U2, the anodal power input that connects described power supply control device of described C9; Described C9 minus earth.
Preferably, described power factor circuit comprises power factor controller part U1 and connects the PFC coil of described U1, and the lead-out terminal of described filter rectification and EMI circuit connects through forward the diode D2 that diode D1, described PFC coil, forward connect successively and is connected to DC lead-out terminal.
Preferably, described LED constant-current drive circuit comprises isolated power supply or non-isolated power supply.
As mentioned above, a kind of switch dimming LED drive circuit of the present invention, comprise mains switch counting and timing circuit, on-off times and time that described mains switch counting and timing circuit are civil power to input ac power calculate, tell is regular tap signal or dimming control signal, if dimming control signal, the driving part of LED is carried out to output current value to be adjusted, can generate LED constant-current drive circuit that corresponding pwm signal or reference voltage level have light adjusting circuit described in giving to realize light modulation, do not change to what existing wiring, also without band, shake control, and, on-off times does not have impact substantially on the life-span of LED light source and lux maintenance, switch dimming LED drive circuit of the present invention has very large advantage from cost and convenience aspect, be easy to be widely used.
Accompanying drawing explanation
Fig. 1 is shown as the major part circuit theory diagrams of the embodiment of switch dimming LED drive circuit of the present invention.
Fig. 2 and Fig. 3 are shown as respectively the circuit theory diagrams of two kinds of embodiment of the LED constant-current drive circuit of switch dimming LED drive circuit of the present invention.
Element numbers explanation
1 filter rectification and EMI circuit
2 power on/off testing circuits
3 U3 adjusting control circuits
4 power supply circuits
5 have the LED constant-current drive circuit of isolated power supply
6 have the LED constant-current drive circuit of non-isolated power supply
7 power factor circuit
Embodiment
Below, by specific instantiation explanation embodiments of the present invention, those skilled in the art can understand other advantages of the present invention and effect easily by the disclosed content of this specification.The present invention can also be implemented or be applied by other different embodiment, and the every details in this specification also can be based on different viewpoints and application, carries out various modifications or change not deviating under spirit of the present invention.
Refer to Fig. 1, the invention provides a kind of switch dimming LED drive circuit, comprising: filter rectification and EMI circuit 1, power on/off testing circuit 2, mains switch counting and timing circuit, dimming control signal generative circuit, power factor circuit 7, power supply circuits 4, there is the LED constant-current drive circuit of light adjusting circuit.It should be noted that, in the present embodiment, described mains switch counting and timing circuit, dimming control signal generative circuit (not shown) are integrated on same device U3 and add that peripheral components is as the circuit 3 of the formation U3 brightness adjustment control such as C3, C4, certainly described mains switch counting and timing circuit, dimming control signal generative circuit the nonessential integrated device that is same as in other embodiments, non-ly take the present embodiment as restriction.
Described filter rectification and EMI circuit 1 input terminal are connected in AC power, and described filter rectification and EMI circuit 1 lead-out terminal are connected in to a DC lead-out terminal through described power factor circuit 7; The lead-out terminal of described filter rectification and EMI circuit 1 is connected in described mains switch counting and timing circuit through described power on/off testing circuit 2; Wherein, described mains switch counting and timing circuit, for calculating the break-make number of times that meets default each make-and-break time interval condition of described AC power; Described mains switch counting and timing circuit are connected in described dimming control signal generative circuit, and described dimming control signal generative circuit is connected in the light adjusting circuit of described LED constant-current drive circuit; Wherein, when the break-make number of times that mains switch is counted and timing circuit calculates meets default light modulation condition, described dimming control signal generative circuit sends the dimming control signal of corresponding described light modulation condition to described light adjusting circuit; Described power supply circuits 4 are connected in described DC lead-out terminal, and described power supply circuits 4 comprise and are powered at the first internal power supply of described power factor circuit 7 and are powered at described mains switch counting and the second internal power supply of timing circuit, dimming control signal generative circuit; Described DC lead-out terminal is connected in described LED constant-current drive circuit so that LED light source is powered.Specifically, in the present embodiment, described mains switch counting and timing circuit are for detect whether break-make of AC power by power on/off testing circuit 2, and calculate the interval time of each break-make, and described default each make-and-break time interval condition can be set as disconnecting described AC power to the time interval that connects AC power and is not more than 5 seconds etc. next time, if be not more than 5 seconds the interval time of each break-make, the effective break-make number of times that can think to meet the demand that will enter light-modulating mode, so just adds up described break-make number of times; And if be greater than default each make-and-break time interval, judge it may is AC power described in common switch, and as effective break-make number of times of light modulation demand, do not counted, certainly this default each make-and-break time interval condition can not be 5 seconds, can be 6 seconds, 7 seconds etc., not as limit.
Preferably, described default light modulation condition refers to a plurality of preset times values and the dimming control signal corresponding from different light modulation brightness values; The break-make number of times calculating when described mains switch counting and timing circuit with one of them preset times value at once, by described dimming control signal generative circuit become next life corresponding dimming control signal extremely described light adjusting circuit with the brightness values by corresponding, carry out light modulation.In the present embodiment, the light modulation value that meaning can be corresponding different according to effective break-make number of times of described calculating, for example 1 time, light modulation to 90% brightness, 2 correspondence 80% brightness, 3 correspondence 70% brightness, by that analogy, corresponding relation is not as limit certainly.Preferably, described U3 also comprises the memory (not shown) that connects described analog to digital converter or voltage comparator, and described memory is at least for storing: described default each make-and-break time interval condition, break-make number of times, default light modulation condition and corresponding dimming control signal; Described memory, can also record current brightness value, the brightness value that while waiting turn on light next time, directly output is recorded.
Preferably, described filter rectification and EMI circuit 1 comprise: fire line terminal L, zero terminal N, filter F1, piezo-resistance VDR, EMI electromagnetic shielding device (C1, C11, L1), rectifier bridge BR1; Described filter is connected in described zero terminal; Described filter, piezo-resistance, EMI electromagnetic shielding device, rectifier bridge are connected in parallel between described fire line terminal and zero terminal; The DC output cathode of described rectifier bridge is connected in described DC lead-out terminal, described rectifier bridge DC output negative pole ground connection.
Preferably, described power on/off testing circuit 2 comprises: resistance R 1, resistance R 2, the negative pole that is connected serially to successively ground connection from the lead-out terminal of described filter rectification and EMI circuit 1 connects the voltage-stabiliser tube Z1 of described R2 and be connected in the divider resistance R3 of Z1 positive pole; Wherein, described mains switch counting and timing circuit have the detection terminal being connected between described Z1 positive pole and R3.
From the above, it is upper that described mains switch counting and timing circuit, dimming control signal generative circuit are integrated in same device U3, preferred, and described U3 connects capacitor C 3, capacitor C 4 and described detection terminal; Wherein, described C3 one end connects described detection terminal, and the other end is by grounding through resistance, and described U3 comprises analog to digital converter or the voltage comparator that is connected in described detection terminal; Described the second internal power supply is connected in the power input of described U3; The power input of described U3 is by C4 ground connection.Described U3 also can detect the magnitude of voltage on C3, also be the means whether a kind of auxiliary detection AC power disconnects really, when the magnitude of voltage of described C3 is during lower than predetermined threshold value, can think that described AC power disconnects, by described mains switch, count and timing circuit calculates whether to meet default each make-and-break time interval condition, if count described break-make number of times.
Preferably, the first internal power supply of described power supply circuits 4 is that 15V voltage source is VDD, described the second internal power supply is described the first internal power supply through the 5V voltage source of U4 transformation output, and this is the standard-required that meets custom circuit.
Preferably, described power supply circuits 4 also comprise storage capacitor C8, and the positive pole of described C8 connects described DC output, minus earth, for when described AC power disconnects to described mains switch counting and timing circuit, the power supply of dimming control signal generative circuit.
Preferably, described power supply circuits 4 also comprise storage capacitor C9, and the positive pole of described C9 is connected in described DC lead-out terminal through diode D3, the resistance R 18 of Opposite direction connection; Described power supply circuits 4 comprise power supply control device U2, the anodal power input that connects described power supply control device of described C9; Described C9 minus earth.
Preferably, described power factor circuit 7 comprises power factor controller part U1 and connects the PFC coil L2 of described U1, and the lead-out terminal of described filter rectification and EMI circuit 1 connects through forward the diode D2 that diode D1, described PFC coil L2, forward connect successively and is connected to DC lead-out terminal.In the present embodiment, described AC power is civil power 220V, through rectifier bridge, is output as 310V, exports 400V to described DC lead-out terminal after PFC coil L2.
Preferably, there is the LED constant-current drive circuit 5 (as shown in Figure 2) of isolated power supply or there is the LED constant-current drive circuit 6 (as shown in Figure 3) of non-isolated power supply, described LED constant-current drive circuit comprises light adjusting circuit, light modulation device in described light adjusting circuit is U5 in Fig. 2 or the U6 in Fig. 3, all having P-DIM terminal is that dim signal receives terminal, in order to be connected in the P-DIM end (the 3rd pin of U3 shown in Fig. 1) of described U3, when U3 sends dimming control signal, the light adjusting circuit that described LED constant-current drive circuit has starts light modulation according to this.
In sum, a kind of switch dimming LED drive circuit of the present invention, comprise mains switch counting and timing circuit, on-off times and time that described mains switch counting and timing circuit are civil power to input ac power calculate, tell is regular tap signal or dimming control signal, if dimming control signal, the driving part of LED is carried out to output current value to be adjusted, can generate LED constant-current drive circuit that corresponding pwm signal or reference voltage level (as 1～10V) have light adjusting circuit as described in giving to realize light modulation, do not change to what existing wiring, also without band, shake control, and, on-off times does not have impact substantially on the life-span of LED light source and lux maintenance, switch dimming LED drive circuit of the present invention has very large advantage from cost and convenience aspect, be easy to be widely used.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all can, under spirit of the present invention and category, modify or change above-described embodiment.Therefore, such as in affiliated technical field, have and conventionally know that the knowledgeable, not departing from all equivalence modifications that complete under disclosed spirit and technological thought or changing, must be contained by claim of the present invention.
Claims (12)
1. a switch dimming LED drive circuit, it is characterized in that, comprising: filter rectification and EMI circuit, power on/off testing circuit, mains switch counting and timing circuit, dimming control signal generative circuit, power factor circuit, power supply circuits, there is the LED constant-current drive circuit of light adjusting circuit;
Wherein, described filter rectification and EMI circuit input end sub-connection are in AC power, and described filter rectification and EMI circuit output end are connected in to a DC lead-out terminal through described power factor circuit;
The lead-out terminal of described filter rectification and EMI circuit is connected in described mains switch counting and timing circuit through described power on/off testing circuit; Wherein, described mains switch counting and timing circuit, for calculating the break-make number of times that meets default each make-and-break time interval condition of described AC power;
Described mains switch counting and timing circuit are connected in described dimming control signal generative circuit, and described dimming control signal generative circuit is connected in the light adjusting circuit of described LED constant-current drive circuit; Wherein, when the break-make number of times that mains switch is counted and timing circuit calculates meets default light modulation condition, described dimming control signal generative circuit sends the dimming control signal of corresponding described light modulation condition to described light adjusting circuit;
Described power supply circuits are connected in described DC lead-out terminal, and described power supply circuits comprise and are powered at the first internal power supply of described power factor circuit and are powered at described mains switch counting and the second internal power supply of timing circuit, dimming control signal generative circuit; Described DC lead-out terminal is connected in described LED constant-current drive circuit so that LED light source is powered.
2. switch dimming LED drive circuit according to claim 1, is characterized in that, described filter rectification and EMI circuit comprise: fire line terminal L, zero terminal N, filter F1, piezo-resistance VDR, EMI electromagnetic shielding device, rectifier bridge BR1;
Described filter is connected in described zero terminal;
Described filter, piezo-resistance, EMI electromagnetic shielding device, rectifier bridge are connected in parallel between described fire line terminal and zero terminal;
The DC output cathode of described rectifier bridge is connected in described DC lead-out terminal, described rectifier bridge DC output negative pole ground connection.
3. switch dimming LED drive circuit according to claim 1, it is characterized in that, described power on/off testing circuit comprises: resistance R 1, resistance R 2, the negative pole that is connected serially to successively ground connection from the lead-out terminal of described filter rectification and EMI circuit connects the voltage-stabiliser tube Z1 of described R2 and be connected in the resistance R 3 of Z1 positive pole;
Wherein, described mains switch counting and timing circuit have the detection terminal being connected between described Z1 positive pole and R3.
4. switch dimming LED drive circuit according to claim 3, is characterized in that, it is upper that described mains switch counting and timing circuit, dimming control signal generative circuit are integrated in same device U3, and described U3 connects capacitor C 3, capacitor C 4 and described detection terminal;
Wherein, described C3 one end connects described detection terminal, and the other end is by grounding through resistance, and described U3 comprises analog to digital converter or the voltage comparator that is connected in described detection terminal; Described the second internal power supply is connected in the power input of described U3; The power input of described U3 is by C4 ground connection;
Wherein, described U3 detects the magnitude of voltage on C3, and described detection magnitude of voltage is during lower than predetermined threshold value, by described mains switch, counts and timing circuit calculates whether meet default each make-and-break time interval condition, if count described break-make number of times.
5. according to the switch dimming LED drive circuit described in claim 1 or 4, it is characterized in that, the first internal power supply of described power supply circuits is 15V voltage source, and described the second internal power supply is that described the first internal power supply is through the 5V voltage source of transformation output.
6. switch dimming LED drive circuit according to claim 4, it is characterized in that, described U3 also comprises the memory that connects described analog to digital converter or voltage comparator, and described memory is at least for storing: described default each make-and-break time interval condition, break-make number of times, default light modulation condition and corresponding dimming control signal.
7. according to the switch dimming LED drive circuit described in claim 1 or 6, it is characterized in that, described default each make-and-break time interval condition refers to and disconnects described AC power to the time interval that next time connects AC power and be not more than 5 seconds.
8. according to the switch dimming LED drive circuit described in claim 1 or 6, it is characterized in that, described default light modulation condition refers to a plurality of preset times values and the dimming control signal corresponding from different light modulation brightness values; The break-make number of times calculating when described mains switch counting and timing circuit with one of them preset times value at once, by described dimming control signal generative circuit become next life corresponding dimming control signal extremely described light adjusting circuit with the brightness values by corresponding, carry out light modulation.
9. switch dimming LED drive circuit according to claim 1, it is characterized in that, described power supply circuits also comprise storage capacitor C8, the positive pole of described C8 connects described DC output, minus earth, for when described AC power disconnects to described mains switch counting and timing circuit, the power supply of dimming control signal generative circuit.
10. switch dimming LED drive circuit according to claim 1, is characterized in that, described power supply circuits also comprise storage capacitor C9, and the positive pole of described C9 is connected in described DC lead-out terminal through diode D3, the resistance R 18 of Opposite direction connection; Described power supply circuits comprise power supply control device U2, the anodal power input that connects described power supply control device of described C9; Described C9 minus earth.
11. switch dimming LED drive circuits according to claim 1, it is characterized in that, described power factor circuit comprises power factor controller part U1 and connects the PFC coil of described U1, and the lead-out terminal of described filter rectification and EMI circuit connects through forward the diode D2 that diode D1, described PFC coil, forward connect successively and is connected to DC lead-out terminal.
12. switch dimming LED drive circuits according to claim 1, is characterized in that, described LED constant-current drive circuit comprises isolated power supply or non-isolated power supply.
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| CN107113945A (en) * | 2014-12-12 | 2017-08-29 | 骆武宁 | The stepless dimming control method of illuminator |
| CN105392239A (en) * | 2015-12-23 | 2016-03-09 | 冷俊 | Lamp brightness control method and LED lamp with brightness adjusting function |
| CN107197570A (en) * | 2017-07-26 | 2017-09-22 | 无锡麟力科技有限公司 | By the control circuit for detecting power switch action regulation light-source brightness |
| CN107197570B (en) * | 2017-07-26 | 2023-10-24 | 无锡麟力科技有限公司 | Control circuit for adjusting light source brightness by detecting power switch action |
| CN109041343A (en) * | 2018-08-06 | 2018-12-18 | 广东德洛斯照明工业有限公司 | A kind of LED drive circuit of low electromagnetic |
| CN112068461A (en) * | 2019-06-11 | 2020-12-11 | 北京大瞬科技有限公司 | Controller, control circuit and method for controlling intelligent equipment by using control circuit |
| CN112068461B (en) * | 2019-06-11 | 2022-01-04 | 北京大瞬科技有限公司 | Controller, control circuit and method for controlling intelligent equipment by using control circuit |
| CN112235901A (en) * | 2020-09-27 | 2021-01-15 | 深圳拓邦股份有限公司 | Method for realizing light modulation of LED lamp by using switch, LED lamp light modulation system and LED lamp |
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