CN104902644A - Transformer-free-structure-based LED light modulation drive circuit - Google Patents
Transformer-free-structure-based LED light modulation drive circuit Download PDFInfo
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- CN104902644A CN104902644A CN201510311536.XA CN201510311536A CN104902644A CN 104902644 A CN104902644 A CN 104902644A CN 201510311536 A CN201510311536 A CN 201510311536A CN 104902644 A CN104902644 A CN 104902644A
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Abstract
The invention discloses a transformer-free-structure-based LED light modulation drive circuit comprising a resistor R3, a capacitor C1, a potentiometer RP1, and an LED lamp group H. One end of a resistor R3 is connected with a 220-V alternating current and the other end of the resistor R3 is connected with a pin 20 of a chip IC1; the other end of the 220-V alternating current is connected with a resistor R4 and a capacitor C3; and the other end of the capacitor C3 is connected with the other end of the resistor R4, a pin 1 of the chip IC1, and a pin 2 of the IC1. According to the invention, the novel current-constant LED drive chip ZD832 is used by the circuit; and with the specific linear control structural system, a full-wave bridge type rectifier, a linear voltage regulator, a control circuit, and an over-voltage and over-temperature protection circuit are integrated, thereby substantially increasing the circuit integration degree and lowering the manufacturing cost. Therefore, the LED light modulation drive circuit has advantages of high integration, low manufacturing cost, and stable output.
Description
Technical field
The present invention relates to a kind of drive circuit, specifically a kind of LED dimming driving circuit of transless structure.
Background technology
No matter the AC-DC constant current LED drive circuit utilizing power frequency supply to power is adopt which kind of topological structure.General all needs uses bridge rectifier, transformer or inductor, not only make circuit structure complicated, increase cost of manufacture, and transformation volume is large, be unfavorable for integrated control, transformer its winding coupled when transformation also can produce peak voltage, thus adds the anti-interference of circuit, affects the stability of output voltage.
Summary of the invention
The object of the present invention is to provide the LED dimming driving circuit of the transless structure that a kind of structure is simple, cost of manufacture is low, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, the invention provides following technical scheme:
A kind of LED dimming driving circuit of transless structure, comprise resistance R3, electric capacity C1, potentiometer RP1 and LED group H, one end of described resistance R3 connects 220V alternating current, the other end of resistance R3 connects the pin 20 of chip IC 1, the other end contact resistance R4 of 220V alternating current and electric capacity C3, the other end of the other end contact resistance R4 of electric capacity C3, the pin 1 of chip IC 1 and the pin 2 of chip IC 1, the pin 6 of chip IC 1 connects PWM dim signal, the pin 7 of chip IC 1 connects electric capacity C1, the other end ground connection of electric capacity C1, the pin 8 contact resistance R2 of chip IC 1, the other end ground connection of resistance R2, the pin 11 of chip IC 1 connects the pin 12 also ground connection of electric capacity C2 and chip IC 1, the pin 13 contact resistance R1 of chip IC 1 and the pin 14 of chip IC 1, the other end of electric capacity C2 connects the pin 15 of chip IC 1, the pin 16 of chip IC 1 and a stiff end of potentiometer RP1, another stiff end of potentiometer RP1 connects sliding end and the LED group H of potentiometer RP1, the other end of the other end contact resistance R1 of LED group H.
As preferred version of the present invention: the model of described chip IC 1 is ZD832.
Compared with prior art; the invention has the beneficial effects as follows: LED dimming driving circuit of the present invention adopts Novel constant-flow LED drive chip ZD832; utilize distinctive Linear Control structural system; be integrated with full wave bridge rectifier, linear voltage regulator, control circuit and overvoltage and thermal-shutdown circuit; significantly increase the integrated level of circuit and reduce cost of manufacture, therefore having that integrated level is high, cost of manufacture is low, the advantage of stable output.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the LED dimming driving circuit of transless structure.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Refer to Fig. 1, a kind of LED dimming driving circuit of transless structure, comprise resistance R3, electric capacity C1, potentiometer RP1 and LED group H, one end of described resistance R3 connects 220V alternating current, the other end of resistance R3 connects the pin 20 of chip IC 1, the other end contact resistance R4 of 220V alternating current and electric capacity C3, the other end of the other end contact resistance R4 of electric capacity C3, the pin 1 of chip IC 1 and the pin 2 of chip IC 1, the pin 6 of chip IC 1 connects PWM dim signal, the pin 7 of chip IC 1 connects electric capacity C1, the other end ground connection of electric capacity C1, the pin 8 contact resistance R2 of chip IC 1, the other end ground connection of resistance R2, the pin 11 of chip IC 1 connects the pin 12 also ground connection of electric capacity C2 and chip IC 1, the pin 13 contact resistance R1 of chip IC 1 and the pin 14 of chip IC 1, the other end of electric capacity C2 connects the pin 15 of chip IC 1, the pin 16 of chip IC 1 and a stiff end of potentiometer RP1, another stiff end of potentiometer RP1 connects sliding end and the LED group H of potentiometer RP1, the other end of the other end contact resistance R1 of LED group H.
The model of described chip IC 1 is ZD832.
Operation principle of the present invention is: 220V alternating current, after resistance R3, resistance R4 and electric capacity C3, become 110V alternating current, and the pin 15 of IC1 plays the effect of AC power supplies selector switch, the thermistor R3 surge current be restricted between the starting period.Ac input voltage exports from pin 16 after rectification in IC1 inside, through electric capacity C2 filtering ripple, adds to LED group H by potentiometer RP1.Electric capacity C1 on the pin 7 of IC1 is that IC1 pressurizer exports decoupling capacitance.LED current is arranged by the earth resistance R2 on the pin 8 of IC1, can control LED group H easily by the 6 PWM dim signals connect being connected on chip IC 1.Circuit adopts Novel constant-flow LED drive chip ZD832; utilize distinctive Linear Control structural system; be integrated with full wave bridge rectifier, linear voltage regulator, control circuit and overvoltage and thermal-shutdown circuit; significantly increase the integrated level of circuit and reduce cost of manufacture, therefore having that integrated level is high, cost of manufacture is low, the advantage of stable output.
Claims (2)
1. a LED dimming driving circuit for transless structure, comprises resistance R3, electric capacity C1, potentiometer RP1 and LED group H, it is characterized in that, one end of described resistance R3 connects 220V alternating current, the other end of resistance R3 connects the pin 20 of chip IC 1, the other end contact resistance R4 of 220V alternating current and electric capacity C3, the other end of the other end contact resistance R4 of electric capacity C3, the pin 1 of chip IC 1 and the pin 2 of chip IC 1, the pin 6 of chip IC 1 connects PWM dim signal, the pin 7 of chip IC 1 connects electric capacity C1, the other end ground connection of electric capacity C1, the pin 8 contact resistance R2 of chip IC 1, the other end ground connection of resistance R2, the pin 11 of chip IC 1 connects the pin 12 also ground connection of electric capacity C2 and chip IC 1, the pin 13 contact resistance R1 of chip IC 1 and the pin 14 of chip IC 1, the other end of electric capacity C2 connects the pin 15 of chip IC 1, the pin 16 of chip IC 1 and a stiff end of potentiometer RP1, another stiff end of potentiometer RP1 connects sliding end and the LED group H of potentiometer RP1, the other end of the other end contact resistance R1 of LED group H.
2. the LED dimming driving circuit of a kind of transless structure according to claim 1, is characterized in that, the model of described chip IC 1 is ZD832.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510311536.XA CN104902644A (en) | 2015-06-09 | 2015-06-09 | Transformer-free-structure-based LED light modulation drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510311536.XA CN104902644A (en) | 2015-06-09 | 2015-06-09 | Transformer-free-structure-based LED light modulation drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104902644A true CN104902644A (en) | 2015-09-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510311536.XA Pending CN104902644A (en) | 2015-06-09 | 2015-06-09 | Transformer-free-structure-based LED light modulation drive circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN104902644A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101106852A (en) * | 2007-06-25 | 2008-01-16 | 四川大学 | Current constant and light adjusting control circuit for luminescent LED array |
| CN204795720U (en) * | 2015-06-09 | 2015-11-18 | 廖婕 | LED of no transformer structure drive circuit that adjusts luminance |
-
2015
- 2015-06-09 CN CN201510311536.XA patent/CN104902644A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101106852A (en) * | 2007-06-25 | 2008-01-16 | 四川大学 | Current constant and light adjusting control circuit for luminescent LED array |
| CN204795720U (en) * | 2015-06-09 | 2015-11-18 | 廖婕 | LED of no transformer structure drive circuit that adjusts luminance |
Non-Patent Citations (1)
| Title |
|---|
| 祝大卫: "基于ZD832的无变压器全球通用AC-DC恒流LED驱动电路", 《电子报》 * |
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Application publication date: 20150909 |