CN104080221B - A kind of LED drive circuit and LED light - Google Patents
A kind of LED drive circuit and LED light Download PDFInfo
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- CN104080221B CN104080221B CN201310099715.2A CN201310099715A CN104080221B CN 104080221 B CN104080221 B CN 104080221B CN 201310099715 A CN201310099715 A CN 201310099715A CN 104080221 B CN104080221 B CN 104080221B
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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 embodiment of the invention discloses a kind of LED drive circuit and LED light, which includes：Reduction voltage circuit, current-limiting resistance, rectification circuit, current foldback circuit and overvoltage crowbar; wherein; the input terminal of reduction voltage circuit is used to be connected to exchange input firewire; the output terminal of reduction voltage circuit is connected to the first input end of rectification circuit, and the cathode output end of rectification circuit is used for the cathode for connecting LED；The first end of current-limiting resistance is used for the anode for being connected to LED, and the second end of current-limiting resistance is connected to the cathode output end of rectification circuit；Second input terminal of rectification circuit is connected to the first end of current foldback circuit, and the second end of current foldback circuit is used to be connected to exchange input zero curve；The first end of overvoltage crowbar is used to be connected to exchange input firewire, and the second end of overvoltage crowbar is connected to the first end of current foldback circuit.LED drive circuit provided by the invention and LED lamp structure are simple, and reliability is high and cost is low.
Description
Technical field
The present invention relates to electronic circuit field, and in particular to a kind of LED drive circuit and LED light.
Background technology
Light emitting diode（Light Emitting Diode, LED）Due to its energy conservation and environmental protection, long lifespan, light efficiency ideal etc.
Characteristic and expanded application, LED light include drive circuit and LED light source, high-power LED lamp is more mature at present, extensively
The general illumination for occasions such as road, tunnel, squares, relative to high-power LED lamp, the research starting of low power LED light
It is later, be not as ripe as high-powered LED lamp.The power of single low-power LED is generally 0.03W~0.1W, low-power LED relative to
Great power LED also has the advantages that junction temperature is low, divergence is good, is adapted to the application such as family, minimized office place, has wide answer
Use prospect.Since the operating voltage and electric current of low-power LED are all smaller, generally use Switching Power Supply is drive circuit, switch
Power supply is of high cost, and reliability is relatively low.
The content of the invention
An embodiment of the present invention provides a kind of LED drive circuit and LED light, its is simple in structure, and reliability is high, and cost
It is low.
LED drive circuit provided by the invention, including：Reduction voltage circuit, current-limiting resistance, rectification circuit, current foldback circuit
And overvoltage crowbar, wherein,
The input terminal of the reduction voltage circuit is used to be connected to exchange input firewire, and the output terminal of the reduction voltage circuit is connected to
The first input end of the rectification circuit, the cathode output end of the rectification circuit export for the cathode of the LED drive circuit
End is used for the cathode for connecting LED；
The anode that the first end of the current-limiting resistance is used to be connected to LED for the cathode output end of the LED drive circuit,
The second end of the current-limiting resistance is connected to the cathode output end of the rectification circuit；
Second input terminal of the rectification circuit is connected to the first end of the current foldback circuit, the overcurrent protection electricity
The second end on road is used to be connected to exchange input zero curve；
The first end of the overvoltage crowbar, which is used to be connected to exchange, inputs firewire, and the second of the overvoltage crowbar
End is connected to the first end of the current foldback circuit.
Alternatively, the reduction voltage circuit includes the first capacitance and first resistor, first capacitance and the first resistor
It is connected in parallel, one end of first capacitance is the input terminal of the reduction voltage circuit, and the other end of first capacitance is described
The output terminal of reduction voltage circuit；
The current foldback circuit includes insurance resistance, and the first end of the insurance resistance is connected to the rectification circuit
Second input terminal, the second end of the insurance resistance are used to be connected to exchange input zero curve；
The overvoltage crowbar includes varistor, and the first end of the varistor is used to be connected to exchange input fire
Line, the second end of the varistor are connected to the first end of the insurance resistance.
Alternatively, the circuit further includes voltage stabilizing inductance and discharge resistance, wherein,
The voltage stabilizing inductance first end is used to be connected to exchange input firewire, and the voltage stabilizing inductance second end is connected to decompression
The input terminal of circuit, the first end of the varistor are connected to voltage stabilizing inductance second end；
The first end of the discharge resistance is connected to the second end of the voltage stabilizing inductance, and the second end of the discharge resistance connects
It is connected to the first end of the insurance resistance.
Alternatively, the circuit further includes ac filter circuit, wherein,
The ac filter circuit includes the second capacitance and second resistance, and the first end of second capacitance is used to be connected to
Exchange input firewire, the second end of second capacitance are used to be connected to exchange input zero curve, the first end of the second resistance
For being connected to exchange input zero curve, the second end of the second resistance is used to be connected to exchange input zero curve.
Alternatively, the circuit further includes DC filtering circuit, wherein,
The DC filtering circuit includes filter inductance and the 3rd capacitance, and the first end of the filter inductance is connected to described
The cathode output end of rectification circuit, the second end of the filter inductance are used to connect for the cathode output end of the LED drive circuit
It is connected to the cathode of LED；
The first end of 3rd capacitance is connected to the second end of the filter inductance, and the second end of the 3rd capacitance connects
It is connected to the cathode output end of the rectification circuit.
LED light provided by the invention, including LED and above-mentioned LED drive circuit, wherein, the cathode of the LED is connected to institute
The cathode output end of LED drive circuit is stated, the anode of the LED is connected to the cathode output end of the LED drive circuit.
Alternatively, the LED includes at least 4 LED, in a manner of the LED is in parallel after series connection by parallel, series connection or first
It is connected between the cathode output end and cathode output end of the LED drive circuit.
The AC-input voltage of power grid is reduced in the operating voltage range of LED by the present invention by reduction voltage circuit, is passed through
LED is supplied after rectifier circuit rectifies, and there is circuit overvoltage crowbar and current foldback circuit can effectively prevent the wave of power grid
Voltage and load short circuits are gushed to damage caused by circuit.LED drive circuit provided by the invention is adapted to the driving of low-power LED,
The advantages of since circuit is simple, the device used is few, therefore high with reliability, and cost is low.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is a kind of circuit diagram of LED drive circuit provided in an embodiment of the present invention；
Fig. 2 is the circuit diagram of another LED drive circuit provided in an embodiment of the present invention；
Fig. 3 is a kind of circuit diagram of LED light provided in an embodiment of the present invention.
Embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without creative efforts
Embodiment, belongs to the scope of protection of the invention.
Please referring to Fig.1, Fig. 1 is a kind of circuit diagram of LED drive circuit provided in an embodiment of the present invention, reduction voltage circuit 101,
Rectification circuit 102, current-limiting resistance 103, current foldback circuit 104 and overvoltage crowbar 105, wherein,
The input terminal of reduction voltage circuit 101 is used to be connected to exchange input firewire, and the output terminal of reduction voltage circuit 101 is connected to whole
The first input end of current circuit 102, the cathode output end of rectification circuit 102 are used to connect for the cathode output end of LED drive circuit
It is connected to the cathode of LED.
The anode that the first end of current-limiting resistance R2 is used to be connected to LED for the cathode output end of LED drive circuit, current limliting electricity
The second end of resistance R2 is connected to the cathode output end of rectification circuit 102.
Second input terminal of rectification circuit 102 is connected to the first end of current foldback circuit 104, current foldback circuit 104
Second end be used for be connected to exchange input zero curve.
The first end of overvoltage crowbar 105 is used to be connected to exchange input firewire, the second end of overvoltage crowbar 105
It is connected to the first end of current foldback circuit 104.
Alternatively, rectification circuit 102 can be overlapped to form rectifier bridge realization using 4 diodes, can also be whole using one
Bridge heap is flowed to realize.Current-limiting resistance can be single resistance, or several resistor coupled in parallel are used in series.
Alternatively, as shown in Figure 2, reduction voltage circuit 101 include the first capacitance C1 and first resistor R1, the first capacitance C1 and
First resistor R1 is connected in parallel.Current foldback circuit 104 includes insurance resistance RN, and the first end of insurance resistance RN is connected to rectification
Second input terminal of circuit 102, the second end of insurance resistance RN are used to be connected to exchange input zero curve.Overvoltage crowbar 105
Including varistor RV, the first end of varistor RV is used to be connected to exchange input firewire, and the second end of varistor RV connects
It is connected to the first end of insurance resistance RN.
Wherein, the first capacitance C1 should select non-polar capacitance, it is impossible to select decomposition voltage, the first capacitance C1 is not differentiated between just
Anode, during input terminal as reduction voltage circuit of the either end of C1, the other end is the output terminal of reduction voltage circuit.Reduction voltage circuit 102
Operation principle be the capacitive reactance that is produced using capacitance under certain AC signal frequency to limit maximum operating currenbt, and produce
Pressure drop.For example, under the conditions of the power frequency of 50Hz, capacitive reactance caused by the capacitance of 1uF is about 3180 Ω, when the alternating voltage of 220V
When being added in the both ends of capacitor, then the maximum current for flowing through capacitance is about 70mA.R1 is used to discharge to C1.
Wherein, insurance resistance has the function of conventional, electric-resistance under normal circumstances, once circuit breaks down, overcurrent occurs
When, will be increased in a short period of time by insuring the temperature of resistance by 500~600 DEG C, and the resistive layer at this moment insured is just by hot soarfing
Fall and fuse, so as to have the function that the other components of protection.Varistor is a kind of votage limit type protection device, utilizes pressure-sensitive electricity
The nonlinear characteristic of resistance, when overvoltage appears in two interpolars of varistor, varistor can be by voltage clamping a to phase
To fixed magnitude of voltage, so as to fulfill the protection to late-class circuit.The present embodiment can effectively protect electricity by varistor RV
Road is not damaged by the surge voltage of power grid, and insurance resistance RN the feelings that load short circuits etc. make circuit overcurrent occur can occur in circuit
Fusing resistor during condition, disconnecting circuit circuit is so as to protect the other devices in circuit without damage.
Alternatively, as shown in Figure 2, LED drive circuit provided by the embodiment can also include voltage stabilizing inductance L and electric discharge electricity
R3 is hindered, voltage stabilizing inductance L first ends are used to be connected to exchange input firewire, and the voltage stabilizing inductance second end is connected to reduction voltage circuit
Input terminal, the first end of varistor RV are connected to voltage stabilizing inductance second end.
The first end of discharge resistance R3 is connected to the second end of voltage stabilizing inductance L, and the second end of discharge resistance R3 is connected to guarantor
The first end of dangerous resistance RN.Wherein, discharge resistance R3 is used for when circuit turns off, and discharges to voltage stabilizing inductance L, prevents L in circuit
Judge that moment feels the device in high voltage damage circuit.
Alternatively, as shown in Figure 2, LED drive circuit provided by the embodiment can also include ac filter circuit 106,
Wherein,
Ac filter circuit 106 includes the second capacitance C2 and the first end of second resistance R4, C2 are defeated for being connected to exchange
Enter firewire, the second end of C2 is used to be connected to exchange input zero curve, and the first end of R4 is used to be connected to exchange input zero curve, R4's
Second end is used to be connected to exchange input zero curve.
Wherein, C2, R4 are for being filtered network voltage.
Alternatively, as shown in Figure 2, LED drive circuit provided by the embodiment can also include DC filtering circuit 107,
Wherein,
DC filtering circuit 107 includes filter inductance L1 and the first end of the 3rd capacitance C3, L1 are connected to rectification circuit 102
Cathode output end, the cathode that the second end of L1 is used to connect LED for the defeated output terminal of cathode of LED drive circuit.
The first end of C3 is connected to the second end of L1, and the second end of C3 is connected to the cathode output end of rectification circuit 102.
Wherein, DC filtering circuit is used to be filtered the output voltage of rectification circuit, obtains stable DC voltage
Waveform.
LED drive circuit provided in this embodiment, is reduced to LED's by reduction voltage circuit by the AC-input voltage of power grid
In operating voltage range, by supplying LED after rectifier circuit rectifies, and circuit has overvoltage crowbar and current foldback circuit
The surge voltage and load short circuits that can effectively prevent power grid are damaged caused by circuit, and voltage stabilizing inductance can be in voltage ripple of power network
When play the role of stable output end voltage, ensure the brightness of LED.LED drive circuit provided by the invention since circuit is simple,
The device used is few, and reliability is high, and cost is low.
Please referring to Fig.3, Fig. 3 is a kind of circuit diagram of LED light provided in an embodiment of the present invention, including：LED and Fig. 1 or Fig. 2
LED drive circuit described in embodiment, wherein, the cathode of LED is connected to the cathode output end of LED drive circuit, the anode of LED
It is connected to the cathode output end of LED drive circuit.
Alternatively, LED includes at least 4 LED, LED can it is in parallel by parallel, series connection or after first connecting in a manner of connect
Between the cathode output end and cathode output end of LED drive circuit.
For example, the connection mode of the small-power straw hat type LED of 60 0.06W 4 can be gone here and there, as shown in Figure 3 in the lump for 15 simultaneously
（It is not drawn into whole parallel branches）.
For LED light provided in this embodiment since drive circuit is simple, the device used is few, therefore reliability is high, and cost is low.
The above disclosure is only the preferred embodiments of the present invention, cannot limit the right model of the present invention with this certainly
Enclose, therefore equivalent variations made according to the claims of the present invention, it is still within the scope of the present invention.
Claims (4)
- A kind of 1. LED drive circuit, it is characterised in that including：Reduction voltage circuit, current-limiting resistance, rectification circuit, current foldback circuit And overvoltage crowbar, wherein,The input terminal of the reduction voltage circuit is used to be connected to exchange input firewire, and the output terminal of the reduction voltage circuit is connected to described The first input end of rectification circuit, the cathode output end of the rectification circuit are used for the cathode output end of the LED drive circuit In the cathode for being connected to LED, wherein, the reduction voltage circuit includes the first capacitance and first resistor, first capacitance and described First resistor is connected in parallel, and one end of first capacitance is the input terminal of the reduction voltage circuit, first capacitance it is another Hold as the output terminal of the reduction voltage circuit；The anode that the first end of the current-limiting resistance is used to be connected to LED for the cathode output end of the LED drive circuit, it is described The second end of current-limiting resistance is connected to the cathode output end of the rectification circuit；Second input terminal of the rectification circuit is connected to the first end of the current foldback circuit, the current foldback circuit Second end is used to be connected to exchange input zero curve；The first end of the overvoltage crowbar is used to be connected to exchange input firewire, and the second end of the overvoltage crowbar connects It is connected to the first end of the current foldback circuit；The current foldback circuit includes insurance resistance, and the first end of the insurance resistance is connected to the second of the rectification circuit Input terminal, the second end of the insurance resistance are used to be connected to the exchange input zero curve；The overvoltage crowbar includes varistor, and the first end of the varistor is used to be connected to the exchange input fire Line, the second end of the varistor are connected to the first end of the insurance resistance；The circuit further includes voltage stabilizing inductance and discharge resistance, wherein：The first end of the voltage stabilizing inductance is used to be connected to exchange input firewire, and the second end of the voltage stabilizing inductance is connected to described The input terminal of reduction voltage circuit；The first end of the discharge resistance is connected to the second end of the voltage stabilizing inductance, and the second end of the discharge resistance is connected to The first end of the current foldback circuit；The discharge resistance, for when the circuit turns off, to the voltage stabilizing inductive discharge；Wherein, the circuit further includes ac filter circuit, wherein,The ac filter circuit includes the second capacitance and second resistance, and the first end of second capacitance is used to be connected to exchange Firewire is inputted, the second end of second capacitance is used to be connected to exchange input zero curve, and the first end of the second resistance is used for Exchange input zero curve is connected to, the second end of the second resistance is used to be connected to exchange input zero curve.
- 2. circuit according to claim 1, it is characterised in that the circuit further includes DC filtering circuit, wherein,The DC filtering circuit includes filter inductance and the 3rd capacitance, and the first end of the filter inductance is connected to the rectification The cathode output end of circuit, the second end of the filter inductance are used to be connected to for the cathode output end of the LED drive circuit The cathode of LED；The first end of 3rd capacitance is connected to the second end of the filter inductance, and the second end of the 3rd capacitance is connected to The cathode output end of the rectification circuit.
- A kind of 3. LED light, it is characterised in that including LED and claim 1 to 2 any one of them circuit, wherein, the LED Cathode be connected to the cathode output end of the LED drive circuit, the anode of the LED is connected to the LED drive circuit Cathode output end.
- 4. LED light according to claim 3, it is characterised in that the LED includes at least 4 LED, and the LED is with simultaneously Connection, series connection or after first connecting mode in parallel be connected to the LED drive circuit cathode output end and cathode output end it Between.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310099715.2A CN104080221B (en) | 2013-03-26 | 2013-03-26 | A kind of LED drive circuit and LED light |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310099715.2A CN104080221B (en) | 2013-03-26 | 2013-03-26 | A kind of LED drive circuit and LED light |
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| CN104080221A CN104080221A (en) | 2014-10-01 |
| CN104080221B true CN104080221B (en) | 2018-05-08 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107230972A (en) * | 2016-04-29 | 2017-10-03 | 上海良信电器股份有限公司 | Breaker multiphase power-supply circuit |
| CN214337557U (en) * | 2019-09-06 | 2021-10-01 | 嘉兴山蒲照明电器有限公司 | Surge protection circuit, power supply device and LED lighting device |
| CN111043535A (en) * | 2019-12-18 | 2020-04-21 | 杭州泰格电子电器有限公司 | LED bulb lamp adopting HE scheme and production process thereof |
| CN114269050B (en) * | 2022-03-02 | 2022-05-27 | 深圳市暗能量电源有限公司 | LED lamp protection circuit and electronic equipment |
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| CN201599589U (en) * | 2009-12-04 | 2010-10-06 | 南通纺织职业技术学院 | LED fluorescent lamp |
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| US20100244703A1 (en) * | 2009-03-25 | 2010-09-30 | Der-Ming Juang | Ac-driven led lighting device |
| CN101989742A (en) * | 2009-08-04 | 2011-03-23 | 汤征宁 | No-load protection circuit for capacitor step-down |
| CN101715265B (en) * | 2009-12-14 | 2013-08-14 | 海洋王照明科技股份有限公司 | LED driving power supply control circuit and LED lamp by using same |
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| CN201599589U (en) * | 2009-12-04 | 2010-10-06 | 南通纺织职业技术学院 | LED fluorescent lamp |
| CN101841955A (en) * | 2010-03-21 | 2010-09-22 | 姜俊旗 | General illumination LED drive circuit |
| CN201774717U (en) * | 2010-08-26 | 2011-03-23 | 佛山市顺德区瑞德电子实业有限公司 | SCR resonance half-bridge based LED streetlamp drive power circuit |
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