CN204539551U - The switch dimming drive circuit of narrow voltage LED and LED dimming control system - Google Patents
The switch dimming drive circuit of narrow voltage LED and LED dimming control system Download PDFInfo
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- CN204539551U CN204539551U CN201520124098.1U CN201520124098U CN204539551U CN 204539551 U CN204539551 U CN 204539551U CN 201520124098 U CN201520124098 U CN 201520124098U CN 204539551 U CN204539551 U CN 204539551U
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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
Abstract
The utility model discloses a kind of switch dimming drive circuit and LED dimming control system of narrow voltage LED.Dimming control system comprises LED and the shared mains switch (S0) of several parallel connections, and each LED includes switch dimming drive circuit, by mains switch (S0) simultaneously to each LED light modulation.Switch dimming drive circuit comprises LED light source circuit (5), rectification circuit (2), filter circuit (3), pulse-width modulation circuit (7), PWM switching circuit (8), constant-current source circuit (4), constant-current source circuit (4) is connected with constant-current source circuit (4) and is connected to PWM switching circuit (8) output, current from power source input is after rectification and filtering, via pulse width modulation (7) produces pulse switch signal, under power switch circuit (6) on-off times controls, pulse-width modulation circuit (7) pulse switch signal has different duty, PWM switching circuit (8) provides time-shared switch electric current to LED light source circuit (5), power control and light modulation are carried out to LED light source circuit (5).Can be applicable to LED light modulation field.
Description
Technical field
The utility model relates to a kind of switch dimming drive circuit of narrow voltage LED.In addition, the utility model also relates to a kind of LED dimming control system.
Background technology
At present, the application of LED is more and more extensive, and the LED lamp for daily indoor and outdoor lighting is also just more and more universal.Traditional incandescent lamp and fluorescent lamp can configure dimmer and carry out light modulation, and the output illumination of adjustment light, to meet the needs of people.Also there is the demand of light modulation in LED, but due to the particularity of LED, traditional light adjusting circuit often can not adapt to LED.Fig. 1, Figure 2 shows that the drive circuit of the two kinds narrow voltage LED that the applicant develops, because the standard line voltage for country variant or area is to there being different LED numbers, therefore this LED is called narrow voltage LED, its drive circuit mainly comprises protective circuit 11, rectification circuit 12, filter circuit 13, constant-current circuit 14 and circuit of light sources 15, fan circuit 16 also protected by the drive circuit of Fig. 2, above-mentioned LED only can timing in more among a small circle at the output voltage of dimmer, dimmer operation could be coordinated, when total cut-in voltage lower than LED of the output voltage of dimmer, then the power output of LED is almost nil, therefore this narrow voltage LED coordinates existing dimmer to be difficult to effective light modulation.In addition, existing dimmer is arranged for single light fixture mostly, especially for LED, also not for multiple system of carrying out brightness adjustment control simultaneously, therefore for the Dimming operation inconvenience of multiple LED.
Utility model content
Technical problem to be solved in the utility model overcomes the deficiencies in the prior art, there is provided that a kind of structure is simple, components and parts are few, adapt to that power bracket is wide, the switch dimming drive circuit of the narrow voltage LED that controls reliable, good dimming effect, this dimming driving circuit is embedded in LED, does not need dimmer can realize carrying out light modulation to LED.
In addition, the utility model also provides a kind of LED dimming control system, and this LED dimming control system does not need dimmer can realize carrying out synchronous light modulation on a large scale easily to multiple LED, is conducive to saves energy.
The technical scheme that the switch dimming drive circuit of the utility model narrow voltage LED adopts is: the switch dimming drive circuit of the narrow voltage LED of the utility model comprises for capable AC electricity being become direct current and providing the rectification circuit of driving voltage to LED light source circuit, for carrying out the filter circuit of filtering to described rectification circuit output current, for generation of the pulse-width modulation circuit of pulse signal and adjusting pulsewidth duty ratio, for responding described pulse-width modulation circuit output pulse signal and the PWM switching circuit providing recurrent pulse to export to described LED light source circuit, for carrying out voltage stabilizing to described LED light source circuit, the constant-current source circuit of current stabilization, described pulse-width modulation circuit comprises Discrete control power output integrated circuit, described constant-current source circuit is connected to the output of described PWM switching circuit, described LED light source circuit and described constant-current source circuit are in series, current from power source input is also successively through described rectification circuit, after described filter circuit rectification and filtering, control to produce pulse switch signal through described pulse-width modulation circuit, under the on-off times of power switch circuit controls, described pulse-width modulation circuit pulse switch signal has different duty ratios, pass through pulse switch signal, described PWM switching circuit provides time-shared switch electric current to described LED light source circuit, thus power control and light modulation are carried out to described LED light source circuit, described power switch circuit is connected to the power input before described rectification circuit.
The switch dimming drive circuit of described narrow voltage LED also comprises current foldback circuit, and described current foldback circuit is connected between power input and described rectification circuit, and described current foldback circuit comprises overcurrent protection protective tube.
Described LED light source circuit comprises at least one group of several LED be in series.
Described constant-current source circuit comprises at least one N channel depletion type field-effect transistor, and the drain electrode of described N channel depletion type field-effect transistor is a contact, and the source electrode of described N channel depletion type field-effect transistor forms another contact with grid phase short circuit.
Or described constant-current source circuit comprises at least one N channel junction field-effect transistors, the drain electrode of described N channel junction field-effect transistors is a contact, and the source electrode of described N channel junction field-effect transistors forms another contact with grid phase short circuit.
Described Discrete control power output integrated circuit comprises RC oscillating circuit, frequency dividing circuit, de-twitter circuit, mode control circuit and four pin, described RC oscillating circuit is for generation of oscillator signal, oscillator signal produces square wave and exports after described frequency dividing circuit, square wave exports after described de-twitter circuit, under the control of described mode control circuit, induction power supply on-off times signal, and export pulse switch signal by preset multiple duty ratio, first pin is earth terminal, tripod is power input, crus secunda is triggering signal input, 4th pin is square-wave pulse signal output, crus secunda is connected with described de-twitter circuit.
Described pulse-width modulation circuit also comprises dropping resistor, voltage stabilizing didoe, filter capacitor, bleeder resistance, diode, electrochemical capacitor, divider resistance, described voltage stabilizing didoe, be in series with described dropping resistor again after described bleeder resistance and described filter capacitor are in parallel, between the output positive and negative charge being connected to described rectification circuit, the positive pole of described diode is connected with the triggering signal input of the contact between described dropping resistor and described filter capacitor and described Discrete control power output integrated circuit, described divider resistance is connected with the negative pole of described diode and the voltage input end of described Discrete control power output integrated circuit after being in parallel with described electrochemical capacitor again.
Described PWM switching circuit comprises at least one N slot field-effect transistor, the grid of described N slot field-effect transistor is connected with the current signal output end of described Discrete control power output integrated circuit, the source electrode of described N slot field-effect transistor is connected commonly with the earth terminal of the negative pole of output end of described rectification circuit, described Discrete control power output integrated circuit, and the drain electrode of described N slot field-effect transistor is connected with described constant-current source circuit.
The switch dimming drive circuit of described narrow voltage LED also comprises radiator fan circuit, and described radiator fan circuit and described LED light source circuit and described constant-current source circuit are in series, and described radiator fan circuit comprises light fixture fan electromotor, fan shunt resistance.
The technical scheme that the utility model LED dimming control system adopts is: the utility model LED dimming control system comprises the LED of several parallel connections and a shared mains switch, each described LED includes the switch dimming drive circuit of narrow voltage LED, carries out light modulation by described mains switch to each described LED simultaneously, the switch dimming drive circuit of narrow voltage LED comprises for capable AC electricity being become direct current and providing the rectification circuit of driving voltage to LED light source circuit, for carrying out the filter circuit of filtering to described rectification circuit output current, for generation of the pulse-width modulation circuit of pulse signal and adjusting pulsewidth duty ratio, for responding described pulse-width modulation circuit output pulse signal and the PWM switching circuit providing recurrent pulse to export to described LED light source circuit, for carrying out voltage stabilizing to described LED light source circuit, the constant-current source circuit of current stabilization, described pulse-width modulation circuit comprises Discrete control power output integrated circuit, described constant-current source circuit is connected to the output of described PWM switching circuit, described LED light source circuit and described constant-current source circuit are in series, current from power source input is also successively through described rectification circuit, after described filter circuit rectification and filtering, control to produce pulse switch signal through described pulse-width modulation circuit, under the on-off times of power switch circuit controls, described pulse-width modulation circuit pulse switch signal has different duty ratios, pass through pulse switch signal, described PWM switching circuit provides time-shared switch electric current to described LED light source circuit, thus power control and light modulation are carried out to described LED light source circuit, described power switch circuit is connected to the power input before described rectification circuit.
The switch dimming drive circuit of described narrow voltage LED also comprises current foldback circuit, and described current foldback circuit is connected between power input and described rectification circuit, and described current foldback circuit comprises overcurrent protection protective tube.
Described LED light source circuit comprises at least one group of several LED be in series.
Described constant-current source circuit comprises at least one N channel depletion type field-effect transistor, and the drain electrode of described N channel depletion type field-effect transistor is a contact, and the source electrode of described N channel depletion type field-effect transistor forms another contact with grid phase short circuit.
Or described constant-current source circuit comprises at least one N channel junction field-effect transistors, the drain electrode of described N channel junction field-effect transistors is a contact, and the source electrode of described N channel junction field-effect transistors forms another contact with grid phase short circuit.
Described Discrete control power output integrated circuit comprises RC oscillating circuit, frequency dividing circuit, de-twitter circuit, mode control circuit and four pin, described RC oscillating circuit is for generation of oscillator signal, oscillator signal produces square wave and exports after described frequency dividing circuit, square wave exports after described de-twitter circuit, under the control of described mode control circuit, induction power supply on-off times signal, and export pulse switch signal by preset multiple duty ratio, first pin is earth terminal, tripod is power input, crus secunda is triggering signal input, 4th pin is square-wave pulse signal output, crus secunda is connected with described de-twitter circuit.
Described pulse-width modulation circuit also comprises dropping resistor, voltage stabilizing didoe, filter capacitor, bleeder resistance, diode, electrochemical capacitor, divider resistance, described voltage stabilizing didoe, be in series with described dropping resistor again after described bleeder resistance and described filter capacitor are in parallel, between the output positive and negative charge being connected to described rectification circuit, the positive pole of described diode is connected with the triggering signal input of the contact between described dropping resistor and described filter capacitor and described Discrete control power output integrated circuit, described divider resistance is connected with the negative pole of described diode and the voltage input end of described Discrete control power output integrated circuit after being in parallel with described electrochemical capacitor again.
Described PWM switching circuit comprises at least one N slot field-effect transistor, the grid of described N slot field-effect transistor is connected with the current signal output end of described Discrete control power output integrated circuit, the source electrode of described N slot field-effect transistor is connected commonly with the earth terminal of the negative pole of output end of described rectification circuit, described Discrete control power output integrated circuit, and the drain electrode of described N slot field-effect transistor is connected with described constant-current source circuit.
The switch dimming drive circuit of described narrow voltage LED also comprises radiator fan circuit, and described radiator fan circuit and described LED light source circuit and described constant-current source circuit are in series, and described radiator fan circuit comprises light fixture fan electromotor, fan shunt resistance.
The beneficial effects of the utility model are: the switch dimming drive circuit due to the narrow voltage LED of the utility model comprises for capable AC electricity being become direct current and providing the rectification circuit of driving voltage to LED light source circuit, for carrying out the filter circuit of filtering to described rectification circuit output current, for generation of the pulse-width modulation circuit of pulse signal and adjusting pulsewidth duty ratio, for responding described pulse-width modulation circuit output pulse signal and the PWM switching circuit providing recurrent pulse to export to described LED light source circuit, for carrying out voltage stabilizing to described LED light source circuit, the constant-current source circuit of current stabilization, described pulse-width modulation circuit comprises Discrete control power output integrated circuit, described constant-current source circuit is connected to the output of described PWM switching circuit, described LED light source circuit and described constant-current source circuit are in series, current from power source input is also successively through described rectification circuit, after described filter circuit rectification and filtering, control to produce pulse switch signal through described pulse-width modulation circuit, under the on-off times of power switch circuit controls, described pulse-width modulation circuit pulse switch signal has different duty ratios, pass through pulse switch signal, described PWM switching circuit provides time-shared switch electric current to described LED light source circuit, thus power control and light modulation are carried out to described LED light source circuit, described power switch circuit is connected to the power input before described rectification circuit, dimming driving circuit is embedded in LED by the utility model, utilize time-shared switch principle, under the control of described pulse-width modulation circuit, the pulsewidth of adjustment output pulse signal, namely duty ratio is adjusted, described PWM switching circuit is made to provide time-shared switch electric current to described LED light source circuit, namely periodically switching current is provided, obtain power supply with making described LED light source circuit period property, thus the power of adjustment LED, and then obtain the adjustment change of light output, namely the utility model is by regulating the pulsewidth of DC pulse signal and duty ratio and then controlling the opening and closing of described PWM switching circuit, to control power supply and the light modulation of LED, therefore the utility model structure is simple, components and parts are few, adapt to power bracket wide, control reliable, good dimming effect, do not need dimmer can realize having the occasion of switch to carry out light modulation to LED any, easy to use,
Because the utility model LED dimming control system comprises the LED of several parallel connections and a shared mains switch, each described LED includes the switch dimming drive circuit of narrow voltage LED, light modulation is carried out to each described LED by described mains switch simultaneously, therefore, LED dimming control system of the present utility model does not need dimmer can realize carrying out synchronous light modulation on a large scale easily to multiple LED, be conducive to saves energy, be especially applicable to the LED Dimming operation in large-scale place.
Accompanying drawing explanation
Fig. 1 is a kind of drive circuit schematic diagram of existing narrow voltage LED;
Fig. 2 is the drive circuit schematic diagram of another kind of existing narrow voltage LED;
Fig. 3 is the switch dimming drive circuit schematic diagram of the narrow voltage LED of the utility model embodiment one and three;
Fig. 4 is the switch dimming drive circuit schematic diagram of the narrow voltage LED of the utility model embodiment two and four;
Fig. 5 is the internal circuit schematic diagram of the Discrete control power output integrated circuit of the utility model embodiment;
Fig. 6 is the output of pulse signal schematic diagram of the Discrete control power output integrated circuit of the utility model embodiment;
Fig. 7 is the integrated connection schematic diagram of the LED dimming control system of the utility model embodiment three and four.
Embodiment
Embodiment one:
As Fig. 3, Fig. 5, shown in Fig. 6, the present embodiment is a kind of switch dimming drive circuit of narrow voltage LED, be embedded in LED, comprise current foldback circuit 1, for capable AC electricity being become direct current and providing the rectification circuit 2 of driving voltage to LED light source circuit 5, for carrying out the filter circuit 3 of filtering to described rectification circuit 2 output current, for generation of the pulse-width modulation circuit 7 of pulse signal and adjusting pulsewidth duty ratio, for responding described pulse-width modulation circuit 7 output pulse signal and the PWM switching circuit 8 providing recurrent pulse to export to described LED light source circuit 5, for carrying out voltage stabilizing to described LED light source circuit 5, the constant-current source circuit 4 of current stabilization, described current foldback circuit 1 is connected to the zero-power line input between power input and described rectification circuit 2, for short-circuit protection, described current foldback circuit 1 comprises overcurrent protection protective tube F1, described rectification circuit 2 adopts bridge rectifier and rectifier bridge D1, other rectifier system rectifications can certainly be adopted, described filter circuit 3 comprises electrochemical capacitor C1, described LED light source circuit 5 comprises one group of several LED be in series, i.e. LED1 ~ LED (n), described constant-current source circuit 4 comprises N channel depletion type field-effect transistor (MOS-FET) Q1a, the drain electrode of described N channel depletion type field-effect transistor Q1a is a contact, the source electrode of described N channel depletion type field-effect transistor Q1a forms another contact with grid phase short circuit, described constant-current source circuit 4 is connected to the output of described PWM switching circuit 8, described LED light source circuit 5 is in series with described constant-current source circuit 4, described pulse-width modulation circuit 7 comprises Discrete control power output integrated circuit U1, described Discrete control power output integrated circuit U1 comprises RC oscillating circuit, 256 frequency dividing circuits, de-twitter circuit, mode control circuit and four pin, described RC oscillating circuit is for generation of oscillator signal, oscillator signal produces square wave and exports after described 256 frequency dividing circuits, in the present embodiment, producing frequency is the square wave of 600Hz, square wave exports after described de-twitter circuit, under the control of described mode control circuit, the opening and closing times signal of induction power supply switch, and export pulse switch signal by preset multiple duty ratio, first pin of described Discrete control power output integrated circuit U1 is earth terminal GROUND, tripod is power input VDD, crus secunda is triggering signal input CP, 4th pin is square-wave pulse signal output Q, crus secunda is connected with described de-twitter circuit, described pulse-width modulation circuit 7 also comprises dropping resistor R1, voltage stabilizing didoe D2, filter capacitor C2, bleeder resistance R2, diode D3, electrochemical capacitor C3, divider resistance R3, described voltage stabilizing didoe D2, be in series with described dropping resistor R1 again after described bleeder resistance R2 and described filter capacitor C2 is in parallel, between the output positive and negative charge being connected to described rectification circuit 1, the positive pole of described diode D3 is connected with the triggering signal input CP of the contact between described dropping resistor R1 and described filter capacitor C2 and described Discrete control power output integrated circuit U1, described divider resistance R3 is connected with the negative pole of described diode D3 and the voltage input end VDD of described Discrete control power output integrated circuit U1 after being in parallel with described electrochemical capacitor C3 again, described PWM switching circuit 8 comprises a N slot field-effect transistor Q1, the grid of described N slot field-effect transistor Q1 is connected with the current signal output end Q of described Discrete control power output integrated circuit U1, the source electrode of described N slot field-effect transistor Q1 is connected with the earth terminal GROUND of the negative pole of output end of described rectification circuit 1, described Discrete control power output integrated circuit U1 commonly, the drain electrode of described N slot field-effect transistor Q1 is connected with described constant-current source circuit 4, and the source electrode being specially described constant-current source circuit 4 is connected with gate contact, current from power source input is also successively after described rectification circuit 2, described filter circuit 3 rectification and filtering, control to produce pulse switch signal through described pulse-width modulation circuit 7, under the on-off times of power switch circuit 6 controls, described pulse-width modulation circuit 7 pulse switch signal has different duty ratios, pass through pulse switch signal, described PWM switching circuit 8 provides time-shared switch electric current to described LED light source circuit 5, thus carries out power control and light modulation to described LED light source circuit 5, described power switch circuit 6 comprises switch element S1, is connected to the power firestreak input before described rectification circuit 2, for carrying out switch and Dimming operation to LED.
In the present embodiment, in described Discrete control power output integrated circuit U1, preset five kinds of duty ratios export pulse switch signal, namely the every opening and closing of mains switch once, square-wave pulse signal output Q circulates output five kinds of PWM duty cycle signals successively, and the duty ratio of five kinds of PWM duty cycle signals is followed successively by 100%, 80%, 60%, 40%, 20%, first time open switch element S1 carry out turning on light operation time, at crus secunda and the triggering signal input CP induction rising string signal of described Discrete control power output integrated circuit U1, 4th pin and square-wave pulse signal output Q high level output duty ratio 100%, when second time open switch element S1 carry out turning on light operation time, output duty cycle 80%, third time open switch element S1 carry out turning on light operation time, output duty cycle 60%, open for 4th time switch element S1 carry out turning on light operation time, output duty cycle 40%, open for 5th time switch element S1 carry out turning on light operation time, output duty cycle 20%, when to open switch element S1 for the 6th time and carry out turning on light operation, output duty cycle 100%, start second circulation, and so forth.
Dimming driving circuit is embedded in LED by the present embodiment, utilize time-shared switch principle, under the control of described pulse-width modulation circuit 7, the pulsewidth of adjustment output pulse signal, namely duty ratio is adjusted, described PWM switching circuit 8 is made to provide time-shared switch electric current to described LED light source circuit 5, namely periodically switching current is provided, described LED light source circuit 5 is made periodically to obtain power supply, thus the power of adjustment LED, and then obtain the adjustment change of light output, namely the utility model is by regulating the pulsewidth of DC pulse signal and duty ratio and then controlling the opening and closing of described PWM switching circuit 8, to control power supply and the light modulation of LED, therefore the present embodiment structure is simple, components and parts are few, adapt to power bracket wide, control reliable, good dimming effect, do not need dimmer can realize having the occasion of switch to carry out light modulation to LED any, easy to use.
Embodiment two:
As shown in Figure 4, the difference of the present embodiment and embodiment one is: in the present embodiment, described constant-current source circuit 4 is N channel junction field-effect transistors (J-FET) Q1a, the drain electrode of described N channel junction field-effect transistors Q1a is a contact, the source electrode of described N channel junction field-effect transistors Q1a forms another contact with grid phase short circuit, namely the present embodiment adopts the N channel depletion type field-effect transistor in N channel junction field-effect transistors replacement embodiment one, and the two function realized is identical with effect; In addition, the switch dimming drive circuit of described narrow voltage LED also comprises radiator fan circuit 9, described radiator fan circuit 9 is in series with described LED light source circuit 5 and described constant-current source circuit 4 and is connected, and described radiator fan circuit 9 comprises light fixture fan electromotor DM and fan shunt resistance RF1.Owing to being provided with radiator fan in LED in the present embodiment, therefore its radiating effect is better, is a kind of LED of active heat removal, is more suitable for high-powered LED lamp and uses.
All the other features of the present embodiment are with embodiment one.
Embodiment three:
As shown in Figure 7, the present embodiment is a kind of LED dimming control system, comprise the LED DS1 of several parallel connections, DS2 ..., DS (n) and shared mains switch S0, each described LED DS1, DS2 ..., DS (n) includes the switch dimming drive circuit of the narrow voltage LED in embodiment one, by described mains switch S0 simultaneously to each described LED DS1, DS2 ..., DS (n) carries out brightness adjustment control.Therefore, the LED dimming control system of the present embodiment does not need dimmer can realize carrying out synchronous light modulation on a large scale easily to multiple LED, is conducive to saves energy, is especially applicable to large-scale place as the LED Dimming operation in cinema, gymnasium etc.
Embodiment four:
The difference of the present embodiment and embodiment three is: in the present embodiment, each described LED DS1, DS2 ..., DS (n) includes the switch dimming drive circuit of the narrow voltage LED in embodiment two, namely the switch dimming drive circuit of narrow voltage LED is different.
All the other features of the present embodiment are with embodiment three.
Above embodiment only illustrates, it is not the restriction to the utility model protection range, described LED light source circuit 5 also can be many groups of several LED be in series, and often can organize LED strip and connect one or more described N channel depletion type field-effect transistor or described N channel junction field-effect transistors, or many group LED strip connect one or more described N channel depletion type field-effect transistor or described N channel junction field-effect transistors; Described PWM switching circuit 8 also can comprise multiple N slot field-effect transistor Q1, to provide larger power stage.
The utility model can be widely used in LED light modulation field.
Claims (10)
1. the switch dimming drive circuit of one kind narrow voltage LED, it is characterized in that: comprise for capable AC electricity being become direct current and providing the rectification circuit (2) of driving voltage to LED light source circuit (5), for carrying out the filter circuit (3) of filtering to described rectification circuit (2) output current, for generation of the pulse-width modulation circuit (7) of pulse signal and adjusting pulsewidth duty ratio, for responding described pulse-width modulation circuit (7) output pulse signal and the PWM switching circuit (8) providing recurrent pulse to export to described LED light source circuit (5), for carrying out voltage stabilizing to described LED light source circuit (5), the constant-current source circuit (4) of current stabilization, described pulse-width modulation circuit (7) comprises Discrete control power output integrated circuit (U1), described constant-current source circuit (4) is connected to the output of described PWM switching circuit (8), described LED light source circuit (5) and described constant-current source circuit (4) are in series, current from power source input is also successively through described rectification circuit (2), after (3) rectification of described filter circuit and filtering, control to produce pulse switch signal through described pulse-width modulation circuit (7), under the on-off times of power switch circuit (6) controls, described pulse-width modulation circuit (7) pulse switch signal has different duty ratios, pass through pulse switch signal, described PWM switching circuit (8) provides time-shared switch electric current to described LED light source circuit (5), thus power control and light modulation are carried out to described LED light source circuit (5), described power switch circuit (6) is connected to the power input before described rectification circuit (2).
2. the switch dimming drive circuit of narrow voltage LED according to claim 1; it is characterized in that: the switch dimming drive circuit of described narrow voltage LED also comprises current foldback circuit (1); described current foldback circuit (1) is connected between power input and described rectification circuit (2), and described current foldback circuit (1) comprises overcurrent protection protective tube (F1).
3. the switch dimming drive circuit of narrow voltage LED according to claim 1, is characterized in that: described LED light source circuit (5) comprises at least one group of several LED be in series.
4. the switch dimming drive circuit of narrow voltage LED according to claim 1, it is characterized in that: described constant-current source circuit (4) comprises at least one N channel depletion type field-effect transistor, the drain electrode of described N channel depletion type field-effect transistor is a contact, and the source electrode of described N channel depletion type field-effect transistor forms another contact with grid phase short circuit.
5. the switch dimming drive circuit of narrow voltage LED according to claim 1, it is characterized in that: described constant-current source circuit (4) comprises at least one N channel junction field-effect transistors, the drain electrode of described N channel junction field-effect transistors is a contact, and the source electrode of described N channel junction field-effect transistors forms another contact with grid phase short circuit.
6. the switch dimming drive circuit of narrow voltage LED according to claim 1, it is characterized in that: described Discrete control power output integrated circuit (U1) comprises RC oscillating circuit, 256 frequency dividing circuits, de-twitter circuit, mode control circuit and four pin, described RC oscillating circuit is for generation of oscillator signal, oscillator signal produces square wave and exports after described 256 frequency dividing circuits, square wave exports after described de-twitter circuit, under the control of described mode control circuit, the opening and closing times signal of induction power supply switch, and export pulse switch signal by preset multiple duty ratio, first pin is earth terminal (GROUND), tripod is power input (VDD), crus secunda is triggering signal input (CP), 4th pin is square-wave pulse signal output (Q), crus secunda is connected with described de-twitter circuit.
7. the switch dimming drive circuit of narrow voltage LED according to claim 6, it is characterized in that: described pulse-width modulation circuit (7) also comprises dropping resistor (R1), voltage stabilizing didoe (D2), filter capacitor (C2), bleeder resistance (R2), diode (D3), electrochemical capacitor (C3), divider resistance (R3), described voltage stabilizing didoe (D2), be in series with described dropping resistor (R1) again after described bleeder resistance (R2) and described filter capacitor (C2) are in parallel, between the output positive and negative charge being connected to described rectification circuit (1), the positive pole of described diode (D3) is connected with the triggering signal input (CP) of the contact between described dropping resistor (R1) and described filter capacitor (C2) and described Discrete control power output integrated circuit (U1), described divider resistance (R3) is connected with the negative pole of described diode (D3) and the voltage input end (VDD) of described Discrete control power output integrated circuit (U1) after being in parallel with described electrochemical capacitor (C3) again.
8. the switch dimming drive circuit of narrow voltage LED according to claim 7, it is characterized in that: described PWM switching circuit (8) comprises at least one N slot field-effect transistor (Q1), the grid of described N slot field-effect transistor (Q1) is connected with the current signal output end (Q) of described Discrete control power output integrated circuit (U1), the source electrode of described N slot field-effect transistor (Q1) and the negative pole of output end of described rectification circuit (1), the earth terminal (GROUND) of described Discrete control power output integrated circuit (U1) is connected commonly, the drain electrode of described N slot field-effect transistor (Q1) is connected with described constant-current source circuit (4).
9. the switch dimming drive circuit of the narrow voltage LED according to claim 1 to 8 any one, it is characterized in that: the switch dimming drive circuit of described narrow voltage LED also comprises radiator fan circuit (9), described radiator fan circuit (9) is in series with described LED light source circuit (5) and described constant-current source circuit (4), and described radiator fan circuit (9) comprises light fixture fan electromotor (DM), fan shunt resistance (RF1).
10. a LED dimming control system, it is characterized in that: comprise several parallel connections LED (DS1, DS2 ..., DSn) an and shared mains switch (S0), each described LED (DS1, DS2 ..., DSn) include the switch dimming drive circuit of the narrow voltage LED described in claim 1 to 9 any one, by described mains switch (S0) simultaneously to each described LED (DS1, DS2 ..., DSn) carry out light modulation.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520124098.1U CN204539551U (en) | 2014-11-20 | 2015-03-03 | The switch dimming drive circuit of narrow voltage LED and LED dimming control system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420706376 | 2014-11-20 | ||
| CN201420706376X | 2014-11-20 | ||
| CN201520124098.1U CN204539551U (en) | 2014-11-20 | 2015-03-03 | The switch dimming drive circuit of narrow voltage LED and LED dimming control system |
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| CN204539551U true CN204539551U (en) | 2015-08-05 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104619097A (en) * | 2014-11-20 | 2015-05-13 | 广州南科集成电子有限公司 | Switch light-dimming drive circuit of narrow-voltage LED lamp and light-dimming control system of LED lamp |
| CN114636121A (en) * | 2020-12-16 | 2022-06-17 | 佛山市国星光电股份有限公司 | Plant lighting device and plant planting system |
-
2015
- 2015-03-03 CN CN201520124098.1U patent/CN204539551U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104619097A (en) * | 2014-11-20 | 2015-05-13 | 广州南科集成电子有限公司 | Switch light-dimming drive circuit of narrow-voltage LED lamp and light-dimming control system of LED lamp |
| CN104619097B (en) * | 2014-11-20 | 2017-01-18 | 广州南科集成电子有限公司 | Switch light-dimming drive circuit of narrow-voltage LED lamp and light-dimming control system of LED lamp |
| CN114636121A (en) * | 2020-12-16 | 2022-06-17 | 佛山市国星光电股份有限公司 | Plant lighting device and plant planting system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150805 Termination date: 20170303 |