CN201054826Y - LED lamp driving circuit - Google Patents
LED lamp driving circuit Download PDFInfo
- Publication number
- CN201054826Y CN201054826Y CNU2007201076304U CN200720107630U CN201054826Y CN 201054826 Y CN201054826 Y CN 201054826Y CN U2007201076304 U CNU2007201076304 U CN U2007201076304U CN 200720107630 U CN200720107630 U CN 200720107630U CN 201054826 Y CN201054826 Y CN 201054826Y
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- Prior art keywords
- led lamp
- resistance
- drive circuit
- unit
- lamp drive
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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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model relates to an illuminating control circuit. The prior art has the disadvantage that the service life of a LED lamp is affected due to the obvious fluctuation of supply voltage when commercial power is supplied. The utility model is mainly composed of a voltage-reducing unit, a rectification unit, a current control unit and a LED lamp serial, and is characterized in that the current control unit is formed by the connection of a thyristor, a protective resistor and a constant current resistor. An input pin of the thyristor is connected with the protective resistor, and an output pin of the thyristor is connected with the constant current resistor and the LED lamp in series. The proposal effectively eliminates the shortcoming that the voltage of commercial power is unstable, reduces the effect on the brightness of the LED lamp when the supply voltage is changed, and causes the LED lamp to string to work in the constant current status, thereby avoiding the damage to a LED apparatus because of transient voltage and prolonging the service life of the LED lamp.
Description
Technical field
The utility model belongs to illumination control circuit, adopts civil power as the luminous drive circuit of power drives LED lamp specifically.
Background technology
What existing lighting field generally used is to adopt incandescent lamp as electric lighting, though this electric lighting is easy, cheap, because incandescent lamp is luminous by the current flow heats tungsten filament, and the meeting evolution of heat in its luminescence process, and light efficiency is low, and useful life is short.Along with the raising of living standards of the people and international community to environmental protection, requirements of saving energy, the product of being badly in need of a kind of energy-conservation, longevity and environmental protection replaces traditional electric lighting.
LED is the writing a Chinese character in simplified form of English of light-emitting diode, belongs to a kind of semiconductor device.Because its unique principle of luminosity when luminous (do not produce substantially heat), brought up powerful application advantage.The Driving technique of LED lamp is mainly by two kinds of schemes at present, and a kind of is to adopt Switching Power Supply to carry out constant current control, and another is to adopt stabilized voltage power supply control.Though the former can realize constant current control, its circuit more complicated, the device of use is many, and cost is not suitable for the circuit of general small size than higher, and Switching Power Supply may produce the electric system that uses the LED lamp and disturb under the high frequency effect.And adopt the latter's stabilized voltage power supply to control, be to carry out deciding voltage control by voltage-stabilizing device, because the V-I characteristic of LED, therefore this control mode requires to have improved the required precision of voltage-stabilizing device undoubtedly than higher to the input voltage of circuit, especially when the input power supply is commercial power supply, because mains fluctuations are more obvious, when LED lamp deepening when voltage reduces, voltage raise then the LED lamp exceeded its rated current, influence its useful life.
The utility model content
The technical assignment of the technical problems to be solved in the utility model and proposition is comparatively obviously to influence the LED lamp defective in useful life because of mains fluctuations when overcoming the commercial power supply that has the existence of stabilized voltage power supply control circuit now, a kind of LED lamp drive circuit of high performance-price ratio is provided, thereby improve the reliability of circuit working, prolong the useful life of LED lamp.For this reason, the utility model adopts following technical scheme:
A kind of LED lamp drive circuit; mainly form by pressure unit, rectification unit, current control unit and LED lamp string; it is characterized in that described current control unit is formed by connecting by controllable silicon, protective resistance and constant current resistance; described silicon controlled input pin links to each other with protective resistance, and output pin of described silicon controlled links to each other with LED lamp string with constant current resistance.
This scheme uses the LED lamp string of high brightness as lighting source, the input power supply is a civil power, alternating current is through pressure unit, form direct current behind the rectification unit, utilize the silicon controlled operation principle, when the supply voltage change, when perhaps abnormal voltage appears in power supply, the electric current that flows through LED lamp string and current control unit changes rapidly, according to the silicon controlled on state characteristic, when the electric current that flows through LED lamp string and current control unit when setting current value, the angle that the controllable silicon conducting is certain, thus circuital current is shunted, make LED lamp string work in constant current state, thereby avoid the LED device to damage because of instantaneous pressure.The size of setting electric current realizes by the resistance that changes constant current resistance.
As the further of technique scheme improved and replenish, the utility model also comprises following additional technical feature:
In order to reduce galvanic ripple voltage after the rectification, be connected with filter unit on the described LED lamp string.Concrete, described filter unit is a filter capacitor.The scintillation effect that LED lamp string produced when this filter capacitor can be eliminated the supply voltage instability.
Because circuit is after cutting off the electricity supply, the electric charge at filter capacitor two ends has little time to discharge, can form certain voltage, behind deenergization 5 minutes, even still have electric current to flow through LED after 10 minutes, for discharge charge in the filter capacitor behind effective reduction power cut-off is parallel with the voltage releasing unit to the influence of LED lamp string on described filter unit.Described voltage releasing unit is for being release resistance.The Standard resistance range of described release resistance R 5 is 10K～100K.This discharges resistance electric charge in the rapid release filter capacitor at short notice, alleviates the damage to LED, makes things convenient for circuit debugging, guarantees that light fixture is safe in utilization, increases the service life.
Described pressure unit is composed in series by the polarity free capacitor of parallel connection and dropping resistor R and PTC resistance.Perhaps be composed in series by PTC resistance and linear transformer.The resistance of described PTC resistance is 5 Ω～50 Ω.Wherein, according to the operating characteristic of PTC resistance, in case short circuit appears in the circuit somewhere, this device is because of heating; it is big that resistance becomes rapidly, is equivalent to circuit is disconnected, with traditional fusible link comparison; need not change, promptly realize safeguard protection, also reduce the maintenance work of light fixture.In addition, this device can reduce the impact to decompression capacitor and LED device of surge voltage and fluctuation voltage, improves the reliability of circuit.
In the technique scheme, lighting source is made up of a series of LED device, and it can be formed by connecting by different modes, and the quantity that connects LED can design according to illuminating effect.
The utility model compared with prior art has following beneficial effect:
1, effectively eliminated the shortcoming of line voltage shakiness, suitable voltage range can reach AC140V～AC260V; And with low cost, cost performance is higher, to the influence of LED lamp brightness, makes LED lamp string work in constant current state, thereby avoids the LED device to damage because of instantaneous pressure when having reduced power supply voltage variation, has prolonged the useful life of LED lamp.
2, adopt the LED light fixture of this circuit, volume is little, is particularly suitable for the control of little electric current, is particularly suitable for the refrigerator system illumination.
Description of drawings
Fig. 1 is a circuit block diagram of the present utility model;
Fig. 2 is the schematic diagram of a physical circuit of the utility model;
Fig. 3 is the schematic diagram of another physical circuit of the utility model.
Embodiment
Below in conjunction with drawings and Examples the utility model is described further:
Embodiment one
Referring to Fig. 2, this LED lamp drive circuit is made up of pressure unit shown in Figure 11, rectification unit 2, current control unit 3, filtering and voltage releasing unit 5 and LED lamp string 4, wherein:
Filtering and voltage releasing unit 5 be by as the filter capacitor of filter unit C3 with (resistance is 10K～100K) be formed in parallel as the release resistance of voltage releasing unit R5.
Thus, to this circuit input civil power, promptly can be applicable to refrigerator system, as illuminating device.
Embodiment two
Referring to Fig. 3, this LED lamp drive circuit is made up of pressure unit shown in Figure 11, rectification unit 2, current control unit 3, filtering and voltage releasing unit 5 and LED lamp string 4, wherein:
Filtering and voltage releasing unit 5 be by as the filter capacitor of filter unit C3 with (resistance is 10K～100K) be formed in parallel as the release resistance of voltage releasing unit R5.
Thus,, promptly can be applicable to refrigerator system,, also can be suitable for the night illumination light fixture as illuminating device to this circuit input civil power.
Among above-mentioned two embodiment, change the resistance of constant resistance R4, can regulate brightness; If change R4 into adjustable resistance, then can realize dimming function, can be used as lighting apparatus such as desk lamp.
Claims (10)
1. LED lamp drive circuit; mainly form by pressure unit (1), rectification unit (2), current control unit (3) and LED lamp string (4); it is characterized in that described current control unit (3) is formed by connecting by controllable silicon (Q1), protective resistance (R3) and constant current resistance (R4); the input pin of described controllable silicon (Q1) links to each other with protective resistance (R3), and an output pin of described controllable silicon (Q1) links to each other with LED lamp string (4) with constant current resistance (R4).
2. LED lamp drive circuit according to claim 1 is characterized in that being connected with on the described LED lamp string (4) filter unit (C3).
3. LED lamp drive circuit according to claim 2 is characterized in that described filter unit (C3) is a filter capacitor.
4. LED lamp drive circuit according to claim 2 is characterized in that being parallel with the voltage releasing unit on the described filter unit (C3).
5. LED lamp drive circuit according to claim 4 is characterized in that described voltage releasing unit is for discharging resistance (R5).
6. LED lamp drive circuit according to claim 5, the Standard resistance range that it is characterized in that described release resistance is 10K～100K.
7. according to the described LED lamp drive circuit of 1～6 arbitrary claim, it is characterized in that described pressure unit (1) is composed in series with PTC resistance (RT) by the polarity free capacitor (C1) and the dropping resistor (R1) of parallel connection.
8. LED lamp drive circuit according to claim 7, the resistance that it is characterized in that described PTC resistance (RT) are 5 Ω～50 Ω.
9. according to the described LED lamp drive circuit of 1～6 arbitrary claim, it is characterized in that described pressure unit (1) is composed in series by PTC resistance (RT) and linear transformer (T1).
10. LED lamp drive circuit according to claim 9, the resistance that it is characterized in that described PTC resistance (RT) are 5 Ω～50 Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201076304U CN201054826Y (en) | 2007-03-24 | 2007-03-24 | LED lamp driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201076304U CN201054826Y (en) | 2007-03-24 | 2007-03-24 | LED lamp driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201054826Y true CN201054826Y (en) | 2008-04-30 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201076304U Expired - Fee Related CN201054826Y (en) | 2007-03-24 | 2007-03-24 | LED lamp driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201054826Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102026451A (en) * | 2010-11-26 | 2011-04-20 | 深圳市聚作实业有限公司 | Dimmable light-emitting diode (LED) driving power supply |
| WO2013177884A1 (en) * | 2012-05-31 | 2013-12-05 | 宁波福泰电器有限公司 | Self-adaptive led daylight lamp |
| CN104582146A (en) * | 2014-12-17 | 2015-04-29 | 深圳市众明半导体照明有限公司 | Led drive circuit |
| CN105792431A (en) * | 2016-04-14 | 2016-07-20 | 成都恒稳光电科技有限公司 | Led lamp energy-saving power supply |
| CN108966422A (en) * | 2018-08-09 | 2018-12-07 | 闽南师范大学 | A kind of light-dimming method and circuit of LED light |
-
2007
- 2007-03-24 CN CNU2007201076304U patent/CN201054826Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102026451A (en) * | 2010-11-26 | 2011-04-20 | 深圳市聚作实业有限公司 | Dimmable light-emitting diode (LED) driving power supply |
| CN102026451B (en) * | 2010-11-26 | 2014-02-19 | 深圳市聚作照明股份有限公司 | Dimmable light-emitting diode (LED) driving power supply |
| WO2013177884A1 (en) * | 2012-05-31 | 2013-12-05 | 宁波福泰电器有限公司 | Self-adaptive led daylight lamp |
| CN104582146A (en) * | 2014-12-17 | 2015-04-29 | 深圳市众明半导体照明有限公司 | Led drive circuit |
| CN105792431A (en) * | 2016-04-14 | 2016-07-20 | 成都恒稳光电科技有限公司 | Led lamp energy-saving power supply |
| CN108966422A (en) * | 2018-08-09 | 2018-12-07 | 闽南师范大学 | A kind of light-dimming method and circuit of LED light |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20080430 Termination date: 20150324 |
|
| EXPY | Termination of patent right or utility model |