CN204168540U - A kind of low cost discrete components and parts LED light adjusting circuit - Google Patents
A kind of low cost discrete components and parts LED light adjusting circuit Download PDFInfo
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- CN204168540U CN204168540U CN201420533501.1U CN201420533501U CN204168540U CN 204168540 U CN204168540 U CN 204168540U CN 201420533501 U CN201420533501 U CN 201420533501U CN 204168540 U CN204168540 U CN 204168540U
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Abstract
The utility model discloses a kind of low cost discrete components and parts LED light adjusting circuit, and power circuit connects adjusting and voltage-reduction switch circuit, and adjusting and voltage-reduction switch circuit comprises master power switch pipe Q1, transformer T1A and LED filter circuit; Q1 base stage meets LED through resistance, and LED connects power circuit, and LED two ends also connect LED filter circuit, and LED filter circuit connects T1A two ends, and collector electrode meets T1A, and grounded emitter; T1A mono-terminating diode D1 positive pole, diode D1 meets LED, and LED connects diode D2 positive pole, the D2 negative pole T1A other end; Under initial condition, electric current is supplied to Q1 base stage through LED through series resistance R1, R2, and conducting Q1 is to T1A energy storage; The shutoff of switch controlled control circui Q1, under Q1 off state, T1A is LED continued power through LED filter circuit.The utility model can eliminate false triggering and LED illumination flicker, and cost is lower.
Description
Technical field
The utility model relates to LED light adjusting circuit, refers in particular to a kind of low cost discrete components and parts LED light adjusting circuit.
Background technology
In prior art, common controllable silicon light modulation circuit theory as shown in Figure 1, when ac input voltage is added in controllable silicon U1 two ends, due to resistance R2, there is the charging interval in the RC charging circuit that resistance R and electric capacity C3 forms, voltage on electric capacity C3 charges from 0V, and the driving stage of controllable silicon U1 series connection DIAC(bidirectional trigger diode, generally about 30V), therefore controllable silicon U1 reliably ends, voltage now on electric capacity C3 slowly rises, when rising to 30V, DIAC triggering and conducting, the conducting of controllable silicon U1 driving stage, the reliable conducting of controllable silicon U1, the voltage instantaneous vanishing at controllable silicon U1 two ends, electric capacity C3 is discharged rapidly by resistance R and resistance R2, when electric capacity C3 Voltage Drop is to DIAC cut-off during below 30V, if the electric current that controllable silicon U1 passes through is greater than it maintain On current, controllable silicon U1 continues conducting, if will end lower than maintenance On current, next cycle repeats described work.
The key parameter of described thyristor regulating optical circuit: one, the maintenance On current of controllable silicon U1, general maintenance On current is 7MA to 50MA, and after conducting, the electric current in controllable silicon loop is greater than this value conducting, otherwise turns off; Two, RC charge circuit, electric capacity C is fixed value, by adjusting resistance R control phase; R is larger, and the charging interval is longer, and ON time is longer, and phase shift angle is larger, otherwise phase shift angle is less.
For controllable silicon light modulation LED, its Problems existing is the compatibility of light adjusting circuit, tradition thyristor regulating optical circuit needs the power processing hundreds of watts of incandescent lamp bulbs consumption, the LED that consumed power is less than 20W with adopt the light adjusting circuit be made up of high-power switch device to produce to influence each other, light adjusting circuit and LED influence each other larger time there is visual flicker.
In order to prevent flicker, thyristor regulating optical circuit needs can latching current after control machines, and conduction period on triggering can maintain electric current, if can not meet, thyristor regulating optical circuit there will be false triggering and LED illumination flicker, and this case produces for solving described problem.
Utility model content
The purpose of this utility model is to provide a kind of low cost discrete components and parts LED light adjusting circuit, and discrete non-isolated voltage-dropping type LED constant current power supply realizes with dimmer compatible in conjunction with leadage circuit, and to eliminate false triggering and LED illumination flicker, and cost is lower.
For reaching above-mentioned purpose, solution of the present utility model is:
A kind of low cost discrete components and parts LED light adjusting circuit, comprises power circuit, adjusting and voltage-reduction switch circuit and switch controlled circuit; Power circuit connects adjusting and voltage-reduction switch circuit, and adjusting and voltage-reduction switch circuit comprises master power switch pipe Q1, transformer T1A and LED filter circuit; Master power switch pipe Q1 base stage meets LED through resistance, and LED connects power circuit, and LED two ends also connect LED filter circuit, and LED filter circuit connects transformer T1A two ends, and collector electrode meets transformer T1A, and grounded emitter; Transformer T1A mono-terminating diode D1 positive pole, diode D1 meets LED, and LED connects diode D2 positive pole, the D2 negative pole transformer T1A other end; Under initial condition, electric current is supplied to master power switch pipe Q1 base stage through LED through series resistance R1, R2, and conducting master power switch pipe Q1 is to transformer T1A energy storage; The shutoff of switch controlled control circui master power switch pipe Q1, under master power switch pipe Q1 off state, transformer T1A is LED continued power through LED filter circuit.
Further, power circuit is made up of rectification circuit, leadage circuit and filter circuit; Rectification circuit input end connects power supply, exports termination leadage circuit input; Leadage circuit exports termination filter circuit input, and filter circuit output connects adjusting and voltage-reduction switch circuit.
Further, vent discharge routing capacitance C1 and resistance R3 and R4 being connected on electric capacity C1 two ends forms, and rectification circuit is rectifier bridge, and resistance R3 connects rectifier bridge negative pole, and resistance R4 connects cathode rectifier.
Further, at the input termination insurance resistance RF of rectifier bridge.
Further, LED filtered electrical routing capacitance EC1 and resistance R5 composes in parallel.
Further, switch controlled circuit comprises Darlington transistor, accumulator and sample circuit; The collector electrode of Darlington transistor is connected with master power switch pipe Q1 base stage, and base stage is connected with master power switch pipe Q1 emitter through sample circuit, and grounded emitter; Sample circuit detects master power switch pipe Q1 collector current, and feeds back to the base stage of Darlington transistor, conducting Darlington transistor, and master power switch pipe Q1 electric current discharges and turns off; Accumulator is that master power switch pipe Q1 powers and conducting again.
Further, Darlington transistor is made up of triode Q2 and Q3, and the base stage of triode Q2 is connected with master power switch pipe Q1 emitter, and collector electrode is connected with master power switch pipe Q1 base stage, and emitter is connected with the base stage of triode Q3; The collector electrode of triode Q3 is connected with master power switch pipe Q1 base stage, and grounded emitter.
Further, accumulator comprises transformer T1B, diode D3 and storage capacitor C3; Transformer T1B is coupled with transformer T1A, and one end connects diode D3 positive pole, and diode D3 negative pole connects energy electric capacity C3 one end, diode D3 two ends parallel resistance R6; The electric capacity C3 other end is by the resistance R7 connection transformer T1B other end; Storage capacitor C3 connects the base stage that diode D3 negative pole one end is connected to master power switch pipe Q1, and the other end is connected to the emitter of master power switch pipe Q1 through resistance R7 and transformer T1B.
Further, sample circuit is connected to resistance R8 and R9 of master power switch pipe Q1 emitter after comprising parallel connection, and one end connects master power switch pipe Q1 emitter, the other end connects series resistance R10 and the R11 of Darlington transistor base stage, and resistance R11 is connected with Darlington transistor base stage.
Further, at Darlington transistor base stage and the resistance R12 and the thermistor NTC that are connected serial connection between emitter, temperature-compensation circuit is formed with resistance R11.
Further, contact resistance R13 between Darlington transistor base stage and emitter, resistance R13 one end series transformer T1B, transformer T1B connects Darlington transistor emitter, other end connecting resistance R11, and resistance R11 is connected with Darlington transistor base stage, composition power feedback.
After adopting such scheme, during utility model works, under initial condition, namely during power supply opening, electric current is supplied to master power switch pipe Q1 base stage through LED through resistance, and conducting master power switch pipe Q1 is to transformer T1A energy storage; The shutoff of switch controlled control circui master power switch pipe Q1, under master power switch pipe Q1 off state, transformer T1A is LED continued power through LED filter circuit, LED normal luminous is thrown light on, the utility model utilizes discrete non-isolated voltage-dropping type LED constant current power supply to realize with dimmer compatible in conjunction with leadage circuit, effective elimination false triggering and LED illumination flicker problem, and cost is lower.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of prior art;
Fig. 2 circuit diagram of the present utility model.
Label declaration
Power circuit 1 rectification circuit 11
Leadage circuit 12 filter circuit 13
Adjusting and voltage-reduction switch circuit 2 LED filter circuit 21
Switch controlled circuit 3 Darlington transistor 31
Accumulator 32 sample circuit 33.
Embodiment
Below in conjunction with drawings and the specific embodiments, the utility model is described in detail.
Consult shown in Fig. 2, a kind of low cost discrete components and parts LED light adjusting circuit that the utility model discloses, comprise power circuit 1, adjusting and voltage-reduction switch circuit 2 and switch controlled circuit 3.
Power circuit 1 connects adjusting and voltage-reduction switch circuit 2, and in the present embodiment, power circuit 1 is made up of rectification circuit 11, leadage circuit 12 and filter circuit 13.Rectification circuit 11 inputs termination power, exports termination leadage circuit 12 input; Leadage circuit 12 exports termination filter circuit 13 input, and filter circuit 13 output connects adjusting and voltage-reduction switch circuit 2.
Wherein, leadage circuit 12 is made up of electric capacity C1 and resistance R3 and R4 that be connected on electric capacity C1 two ends, and rectification circuit 11 is rectifier bridge, and resistance R3 connects rectifier bridge negative pole, and resistance R4 connects cathode rectifier.Meanwhile, at the input termination insurance resistance RF of rectifier bridge.The LC filter circuit that filter circuit 13 is made up of inductance L 0 and electric capacity C2.
Because light adjusting circuit is when triggering, there is higher voltage and current spike in the quick charge effect of electric capacity C1.Current spike destroys thyristor regulating optical circuit, particularly like this when especially multiple LED is in parallel, because the current spike sum of each LED will exceed the rated current of thyristor regulating optical circuit.There will be current oscillation after current spike, occur in vibration, lower than the negative current maintaining electric current, causing desk lamp with dimmer switch false triggering.If due to voltage spikes exceeds breakdown voltage rating, external devices will be destroyed.The electric capacity C1 of leadage circuit 12, for providing latching current and maintaining On current.Eliminate above-mentioned voltage and current spike, adopt this spike of bleeder resistance R4 damping.Described electric current is maintain On current to silicon controlled, thus eliminates false triggering and flicker.
Adjusting and voltage-reduction switch circuit 2 comprises master power switch pipe Q1, transformer T1A and LED filter circuit 21.Master power switch pipe Q1 base stage meets LED through series resistance R1, R2.LED connects power circuit 1, LED two ends and connects LED filter circuit 21, LED filter circuit 21 and connects transformer T1A two ends, and LED filter circuit 21 is composed in parallel by electric capacity EC1 and resistance R5.The collector electrode of master power switch pipe Q1 meets transformer T1A, and grounded emitter.Transformer T1A mono-terminating diode D1 positive pole, diode D1 meets LED, and LED connects diode D2 positive pole, the D2 negative pole transformer T1A other end.
In LED filter circuit 21, electric capacity EC1 plays the electric current that the flat LED of filter flows through, and makes LED luminescence more stable.Wherein LED open loop protection circuit is play LED circuit cut-off protection by diode D2, and when LED opens a way, D2 is just in reverse blocking state, thus makes R1 be not activated electric current to flow through, and circuit cannot start, and plays the effect of open-circuit-protection.
Under initial condition, electric current is supplied to master power switch pipe Q1 base stage through LED through series resistance R1, R2, and conducting master power switch pipe Q1 is to transformer T1A energy storage; Switch controlled circuit 3 controls the shutoff of master power switch pipe Q1, under master power switch pipe Q1 off state, transformer T1A is LED continued power through LED filter circuit 21, and LED normal luminous is thrown light on, effective elimination false triggering and LED illumination flicker problem, and cost is lower.
Master power switch pipe Q1 is operated in HF switch state, and when its conducting, electric current forms conducting loop by rectifier bridge and L0, LED, transformer T1A and master power switch pipe Q1.When it is closed, the energy stored in transformer T1A, by the loop release current of diode D1, LED, is so the one-period of this circuit HF switch.Through the filtering of EC1, LED has continuous print electric current pass through, LED normal luminous throws light on.
The electric capacity EC1 of LED filter circuit 21 plays the flat LED light source of filter and flows through the function of current, makes the luminescence of LED more stable.Wherein, by diode D2 as LED open loop protection circuit, when LED opens a way, D2 is in reverse blocking state, thus makes R1 be not activated electric current to flow through, and circuit cannot start, and plays the effect of open-circuit-protection.
Switch controlled circuit 3 comprises Darlington transistor 31, accumulator 32 and sample circuit 33.The collector electrode of Darlington transistor 21 is connected with master power switch pipe Q1 base stage, and base stage is connected with master power switch pipe Q1 emitter through sample circuit 33, and grounded emitter; Sample circuit 33 detects master power switch pipe Q1 collector current, and feeds back to the base stage of Darlington transistor 31, conducting Darlington transistor 31, and master power switch pipe Q1 electric current discharges and turns off; Accumulator 32 is that master power switch pipe Q1 powers and conducting again.
Darlington transistor 31 is made up of triode Q2 and Q3, and the base stage of triode Q2 is connected with master power switch pipe Q1 emitter, and collector electrode is connected with master power switch pipe Q1 base stage, and emitter is connected with the base stage of triode Q3; The collector electrode of triode Q3 is connected with master power switch pipe Q1 base stage, and grounded emitter.
Accumulator 33 comprises transformer T1B, diode D3 and storage capacitor C3; Transformer T1B is coupled with transformer T1A, and one end connects diode D3 positive pole, and diode D3 negative pole connects energy electric capacity C3 one end, diode D3 two ends parallel resistance R6; The electric capacity C3 other end is by the resistance R7 connection transformer T1B other end; Storage capacitor C3 connects the base stage that diode D3 negative pole one end is connected to master power switch pipe Q1, and the other end is connected to the emitter of master power switch pipe Q1 through resistance R7 and transformer T1B.
Sample circuit 33 is connected to resistance R8 and R9 of master power switch pipe Q1 emitter after comprising parallel connection, and one end connects master power switch pipe Q1 emitter, the other end connects series resistance R10 and the R11 of Darlington transistor 31 base stage, and resistance R11 is connected with Darlington transistor base stage.
At Darlington transistor 31 base stage and the resistance R12 and the thermistor NTC that are connected serial connection between emitter, form temperature-compensation circuit with resistance R11.
Contact resistance R13 between Darlington transistor 31 base stage and emitter, resistance R13 one end series transformer T1B, transformer T1B connects Darlington transistor 31 emitter, and other end connecting resistance R11, resistance R11 are connected with Darlington transistor 31 base stage, composition power feedback.
The ideal base drive current first time of master power switch pipe Q1 starts to be provided by resistance R1 and R2, and its ideal base drive current is provided by R7 and C3 by transformer T1B subsequently.The shutoff of master power switch pipe Q1 is controlled by triode Q2 and Q3, and low pressure amplifying triode Q2 and Q3 constitutes darlington structure, and darlington structure has better dynamic response.As triode Q2 and Q3 conducting, discharged by the ideal base drive current of master power switch pipe Q1, make it close, the ON time controlling master power switch pipe Q1 is the key point of LED whether constant current.
Wherein, resistance R11, resistance R4, resistance NTC and triode Q2, Q3 constitute temperature compensation circuit, its principle is as follows: resistance NTC is a kind of thermistor, when voltage on central R11 is greater than { VBE (Q2)+VBE (Q3) } × (R12+NTC+R3)/(R12+NTC), the Darlington triode conducting that triode Q2 and Q3 forms, controls master power switch pipe Q1 and closes.When ambient temperature raises, according to dynatron performance, BE ties forward voltage and can reduce, and namely VBE (Q2)+VBE (Q3) can reduce.And thermistor NTC resistance can reduce, serve the effect of temperature-compensating feedback, make the voltage on R11 still can ensure when different temperatures to make master power switch pipe Q1 turn off when identical magnitude of voltage, under making different ambient temperatures, master power switch pipe Q1 still can keep substantially identical ON time.Reduce temperature to the impact of LED current.
Transformer T1B and resistance R13 plays the effect to supply voltage feedback, when supply voltage raises, during the Q1 conducting of master power switch pipe, transformer T1B voltage can raise, improved by the voltage on R13, master power switch pipe Q1 is suitably turned off in advance, reduces the impact of LED current by supply voltage.
Resistance R8, R9 detect master power switch pipe Q1 collector current, and the magnitude of voltage that electric current is produced on R8, R9 is added to the voltage on R11 by R10, control the shutoff of triode Q2.
The foregoing is only preferred embodiment of the present utility model, not to the restriction of this case design, all equivalent variations done according to the design key of this case, all fall into the protection range of this case.
Claims (10)
1. a low cost discrete components and parts LED light adjusting circuit, is characterized in that: comprise power circuit, adjusting and voltage-reduction switch circuit and switch controlled circuit; Power circuit connects adjusting and voltage-reduction switch circuit, and adjusting and voltage-reduction switch circuit comprises master power switch pipe Q1, transformer T1A and LED filter circuit; Master power switch pipe Q1 base stage meets LED through resistance, and LED connects power circuit, and LED two ends also connect LED filter circuit, and LED filter circuit connects transformer T1A two ends, and collector electrode meets transformer T1A, and grounded emitter; Transformer T1A mono-terminating diode D1 positive pole, diode D1 meets LED, and LED connects diode D2 positive pole, the D2 negative pole transformer T1A other end; Under initial condition, electric current is supplied to master power switch pipe Q1 base stage through LED through series resistance R1, R2, and conducting master power switch pipe Q1 is to transformer T1A energy storage; The shutoff of switch controlled control circui master power switch pipe Q1, under master power switch pipe Q1 off state, transformer T1A is LED continued power through LED filter circuit.
2. a kind of low cost discrete components and parts LED light adjusting circuit as claimed in claim 1, is characterized in that: power circuit is made up of rectification circuit, leadage circuit and filter circuit; Rectification circuit input end connects power supply, exports termination leadage circuit input; Leadage circuit exports termination filter circuit input, and filter circuit output connects adjusting and voltage-reduction switch circuit.
3. a kind of low cost discrete components and parts LED light adjusting circuit as claimed in claim 2, it is characterized in that: vent discharge routing capacitance C1 and resistance R3 and R4 being connected on electric capacity C1 two ends forms, rectification circuit is rectifier bridge, and resistance R3 connects rectifier bridge negative pole, and resistance R4 connects cathode rectifier.
4. a kind of low cost discrete components and parts LED light adjusting circuit as claimed in claim 3, is characterized in that: at the input termination insurance resistance RF of rectifier bridge; LED filtered electrical routing capacitance EC1 and resistance R5 composes in parallel.
5. a kind of low cost discrete components and parts LED light adjusting circuit as claimed in claim 1, is characterized in that: switch controlled circuit comprises Darlington transistor, accumulator and sample circuit; The collector electrode of Darlington transistor is connected with master power switch pipe Q1 base stage, and base stage is connected with master power switch pipe Q1 emitter through sample circuit, and grounded emitter; Sample circuit detects master power switch pipe Q1 collector current, and feeds back to the base stage of Darlington transistor, conducting Darlington transistor, and master power switch pipe Q1 electric current discharges and turns off; Accumulator is that master power switch pipe Q1 powers and conducting again.
6. a kind of low cost discrete components and parts LED light adjusting circuit as claimed in claim 5, it is characterized in that: Darlington transistor is made up of triode Q2 and Q3, the base stage of triode Q2 is connected with master power switch pipe Q1 emitter, collector electrode is connected with master power switch pipe Q1 base stage, and emitter is connected with the base stage of triode Q3; The collector electrode of triode Q3 is connected with master power switch pipe Q1 base stage, and grounded emitter.
7. a kind of low cost discrete components and parts LED light adjusting circuit as claimed in claim 5, is characterized in that: accumulator comprises transformer T1B, diode D3 and storage capacitor C3; Transformer T1B is coupled with transformer T1A, and one end connects diode D3 positive pole, and diode D3 negative pole connects energy electric capacity C3 one end, diode D3 two ends parallel resistance R6; The electric capacity C3 other end is by the resistance R7 connection transformer T1B other end; Storage capacitor C3 connects the base stage that diode D3 negative pole one end is connected to master power switch pipe Q1, and the other end is connected to the emitter of master power switch pipe Q1 through resistance R7 and transformer T1B.
8. a kind of low cost discrete components and parts LED light adjusting circuit as claimed in claim 5, it is characterized in that: sample circuit is connected to resistance R8 and R9 of master power switch pipe Q1 emitter after comprising parallel connection, and one end connects master power switch pipe Q1 emitter, the other end connects series resistance R10 and the R11 of Darlington transistor base stage, and resistance R11 is connected with Darlington transistor base stage.
9. a kind of low cost discrete components and parts LED light adjusting circuit as claimed in claim 8, is characterized in that: at Darlington transistor base stage and the resistance R12 and the thermistor NTC that are connected serial connection between emitter, form temperature-compensation circuit with resistance R11.
10. a kind of low cost discrete components and parts LED light adjusting circuit as claimed in claim 8, it is characterized in that: contact resistance R13 between Darlington transistor base stage and emitter, resistance R13 one end series transformer T1B, transformer T1B connects Darlington transistor emitter, other end connecting resistance R11, resistance R11 is connected with Darlington transistor base stage, composition power feedback.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420533501.1U CN204168540U (en) | 2014-09-17 | 2014-09-17 | A kind of low cost discrete components and parts LED light adjusting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420533501.1U CN204168540U (en) | 2014-09-17 | 2014-09-17 | A kind of low cost discrete components and parts LED light adjusting circuit |
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| Publication Number | Publication Date |
|---|---|
| CN204168540U true CN204168540U (en) | 2015-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420533501.1U Expired - Fee Related CN204168540U (en) | 2014-09-17 | 2014-09-17 | A kind of low cost discrete components and parts LED light adjusting circuit |
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| CN (1) | CN204168540U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104219851A (en) * | 2014-09-17 | 2014-12-17 | 厦门萤火虫节能科技有限公司 | Light-emitting diode (LED) lamp dimming circuit for low-cost split components |
| CN107920406A (en) * | 2017-12-07 | 2018-04-17 | 厦门恩耐照明技术有限公司 | A kind of open loop protection circuit in self-maintained circuit |
| CN109302052A (en) * | 2018-11-12 | 2019-02-01 | 广东乐心医疗电子股份有限公司 | High-voltage starting circuit and switching power supply |
-
2014
- 2014-09-17 CN CN201420533501.1U patent/CN204168540U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104219851A (en) * | 2014-09-17 | 2014-12-17 | 厦门萤火虫节能科技有限公司 | Light-emitting diode (LED) lamp dimming circuit for low-cost split components |
| CN107920406A (en) * | 2017-12-07 | 2018-04-17 | 厦门恩耐照明技术有限公司 | A kind of open loop protection circuit in self-maintained circuit |
| CN109302052A (en) * | 2018-11-12 | 2019-02-01 | 广东乐心医疗电子股份有限公司 | High-voltage starting circuit and switching power supply |
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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 |
Granted publication date: 20150218 Termination date: 20150917 |
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| EXPY | Termination of patent right or utility model |