CN104080221A - LED (Light Emitting Diode) driving circuit and LED lamp - Google Patents
LED (Light Emitting Diode) driving circuit and LED lamp Download PDFInfo
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- CN104080221A CN104080221A CN201310099715.2A CN201310099715A CN104080221A CN 104080221 A CN104080221 A CN 104080221A CN 201310099715 A CN201310099715 A CN 201310099715A CN 104080221 A CN104080221 A CN 104080221A
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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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Abstract
The embodiment of the invention discloses an LED (Light Emitting Diode) driving circuit and an LED lamp. The driving circuit comprises a voltage stepdown circuit, a current limiting resistor, a rectifying circuit, an overcurrent protection circuit and an overvoltage protection circuit, wherein an input end of the voltage stepdown circuit is connected with an alternating current input live line; an output end of the voltage stepdown circuit is connected with a first input end of the rectifying circuit; a positive pole output end of the rectifying circuit is connected with a positive pole of an LED; a first end of the current limiting resistor is connected with a negative pole of the LED; a second end of the current limiting resistor is connected with a negative pole output end of the rectifying circuit; a second input end of the rectifying circuit is connected with a first end of the overcurrent protection circuit; a second end of the overcurrent protection circuit is connected with an alternating current input zero line; a first end of the overvoltage protection circuit is connected with the alternating current input live line; and a second end of the overvoltage protection circuit is connected with the first end of the overcurrent protection circuit. The LED driving circuit and the LED lamp are simple in structure, high in reliability and low in cost.
Description
Technical field
The present invention relates to electronic circuit field, be specifically related to a kind of LED drive circuit and LED lamp.
Background technology
Light-emitting diode (Light Emitting Diode, LED) due to its energy-conserving and environment-protective, the characteristic such as the life-span is long, light efficiency is desirable and applied, LED lamp comprises drive circuit and LED light source, high-power LED lamp is comparatively ripe at present, be widely used in the illumination of the occasions such as road, tunnel, square, with respect to high-power LED lamp, the research of low power LED lamp is started late, not as high-powered LED lamp maturation.The power of single low-power LED is generally 0.03W～0.1W, and low-power LED also has advantages of that with respect to great power LED junction temperature is low, divergence good, is applicable to the application such as family, minimized office place, has broad application prospects.Because operating voltage and the electric current of low-power LED are all smaller, conventionally adopting Switching Power Supply is drive circuit, and Switching Power Supply cost is high, and reliability is lower.
Summary of the invention
The embodiment of the present invention provides a kind of LED drive circuit and LED lamp, and it is simple in structure, and reliability is high, and cost is low.
LED drive circuit provided by the invention, comprising: reduction voltage circuit, current-limiting resistance, rectification circuit, current foldback circuit and overvoltage crowbar, wherein,
The input of described reduction voltage circuit is used for being connected to exchanging inputs live wire, the output of described reduction voltage circuit is connected to the first input end of described rectification circuit, and the cathode output end that the cathode output end of described rectification circuit is described LED drive circuit is for connecting the positive pole of LED;
The first end of described current-limiting resistance be the cathode output end of described LED drive circuit for being connected to the negative pole of LED, the second end of described current-limiting resistance is connected to the cathode output end of described rectification circuit;
The second input of described rectification circuit is connected to the first end of described current foldback circuit, and the second end of described current foldback circuit is used for being connected to exchanging inputs zero line;
The first end of described overvoltage crowbar is used for being connected to exchanging inputs live wire, and the second end of described overvoltage crowbar is connected to the first end of described current foldback circuit.
Alternatively, described reduction voltage circuit comprises the first electric capacity and the first resistance, described the first electric capacity and described the first resistance are connected in parallel, the input that one end of described the first electric capacity is described reduction voltage circuit, the output that the other end of described the first electric capacity is described reduction voltage circuit;
Described current foldback circuit comprises insurance resistance, and the first end of described insurance resistance is connected to the second input of described rectification circuit, and the second end of described insurance resistance is used for being connected to exchanging inputs zero line;
Described overvoltage crowbar comprises piezo-resistance, and the first end of described piezo-resistance is used for being connected to exchanging inputs live wire, and the second end of described piezo-resistance is connected to the first end of described insurance resistance.
Alternatively, described circuit also comprises voltage stabilizing inductance and discharge resistance, wherein,
Described voltage stabilizing inductance first end is used for being connected to exchanging inputs live wire, and described voltage stabilizing inductance the second end is connected to the input of reduction voltage circuit, and the first end of described piezo-resistance is connected to voltage stabilizing inductance the second end;
The first end of described discharge resistance is connected to the second end of described voltage stabilizing inductance, and the second end of described discharge resistance is connected to the first end of described insurance resistance.
Alternatively, described circuit also comprises ac filter circuit, wherein,
Described ac filter circuit comprises the second electric capacity and the second resistance, the first end of described the second electric capacity is used for being connected to exchanging inputs live wire, the second end of described the second electric capacity is used for being connected to exchanging inputs zero line, the first end of described the second resistance is used for being connected to exchanging inputs zero line, and the second end of described the second resistance is used for being connected to exchanging inputs zero line.
Alternatively, described circuit also comprises DC filtering circuit, wherein,
Described DC filtering circuit comprises filter inductance and the 3rd electric capacity, the first end of described filter inductance is connected to the cathode output end of described rectification circuit, and the cathode output end that the second end of described filter inductance is described LED drive circuit is for being connected to the positive pole of LED;
The first end of described the 3rd electric capacity is connected to the second end of described filter inductance, and the second end of described the 3rd electric capacity is connected to the cathode output end of described rectification circuit.
LED lamp provided by the invention, comprises LED and above-mentioned LED drive circuit, and wherein, the positive pole of described LED is connected to the cathode output end of described LED drive circuit, and the negative pole of described LED is connected to the cathode output end of described LED drive circuit.
Alternatively, described LED comprises at least 4 LEDs, and described LED is connected between the cathode output end and cathode output end of described LED drive circuit with in parallel, the rear mode in parallel of connecting or first connect.
The present invention is reduced to the AC-input voltage of electrical network in the operating voltage range of LED by reduction voltage circuit; by supplying with LED after rectification circuit rectification, and circuit has overvoltage crowbar and current foldback circuit can effectively prevent the surge voltage of electrical network and the infringement that load short circuits causes circuit.LED drive circuit provided by the invention is applicable to the driving of low-power LED, and because circuit is simple, the device of use is few, therefore has reliability high, the advantage that cost is low.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the circuit diagram of a kind of LED drive circuit of providing of the embodiment of the present invention;
Fig. 2 is the circuit diagram of the another kind of LED drive circuit that provides of the embodiment of the present invention;
Fig. 3 is the circuit diagram of a kind of LED lamp of providing of the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Please refer to Fig. 1, Fig. 1 is the circuit diagram of a kind of LED drive circuit of providing of the 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 of reduction voltage circuit 101 is used for being connected to exchanging inputs live wire, the output of reduction voltage circuit 101 is connected to the first input end of rectification circuit 102, and the cathode output end that the cathode output end of rectification circuit 102 is LED drive circuit is for being connected to the positive pole of LED.
The first end of current-limiting resistance R2 be the cathode output end of LED drive circuit for being connected to the negative pole of LED, the second end of current-limiting resistance R2 is connected to the cathode output end of rectification circuit 102.
The second input of rectification circuit 102 is connected to the first end of current foldback circuit 104, and the second end of current foldback circuit 104 is used for being connected to exchanging inputs zero line.
The first end of overvoltage crowbar 105 is used for being connected to exchanging inputs live wire, and the second end of overvoltage crowbar 105 is connected to the first end of current foldback circuit 104.
Alternatively, rectification circuit 102 can use 4 diodes to be overlapped to form rectifier bridge and realize, and also can use a rectifier bridge stack to realize.Current-limiting resistance can be single resistance, can be also that several resistance parallel connections or series connection are used.
Alternatively, as shown in Figure 2, reduction voltage circuit 101 comprises that the first capacitor C 1 and the first resistance R 1, the first capacitor C 1 and the first resistance R 1 are connected in parallel.Current foldback circuit 104 comprises insurance resistance R N, and the first end of insurance resistance R N is connected to the second input of rectification circuit 102, and the second end of insurance resistance R N is used for being connected to exchanging inputs zero line.Overvoltage crowbar 105 comprises piezo-resistance RV, and the first end of piezo-resistance RV is used for being connected to exchanging inputs live wire, and the second end of piezo-resistance RV is connected to the first end of insurance resistance R N.
Wherein, the first capacitor C 1 should be selected non-polar electric capacity, can not select decomposition voltage, and the first capacitor C 1 is not distinguished both positive and negative polarity, and any one end of C1 is during as the input of reduction voltage circuit, the output that the other end is reduction voltage circuit.The operation principle of reduction voltage circuit 102 is that the capacitive reactance that utilizes electric capacity to produce under certain AC signal frequency limits maximum operating currenbt, and produces pressure drop.For example, under the power frequency condition of 50Hz, the capacitive reactance that the electric capacity of 1uF produces is about 3180 Ω, and in the time that the alternating voltage of 220V is added in the two ends of capacitor, the maximum current that flows through electric capacity is about 70mA.R1 is for discharging to C1.
Wherein, insurance resistance has the function of conventional, electric-resistance under normal circumstances; once circuit breaks down; while there is overcurrent; the temperature of insurance resistance will be elevated to 500～600 DEG C in a short period of time; at this moment the resistive layer of insurance is just subject to thermal spalling and fuses, thereby reaches the effect of other components and parts of protection.Piezo-resistance is a kind of votage limit type protection device, utilizes the nonlinear characteristic of piezo-resistance, and when overvoltage appears at two interpolars of piezo-resistance, piezo-resistance can be by voltage clamping to relatively-stationary magnitude of voltage, thereby realizes the protection to late-class circuit.The present embodiment by piezo-resistance RV effectively protective circuit do not damaged by the surge voltage of electrical network; insurance resistance R N can be in the time that circuit occurs that load short circuits etc. makes circuit occur the situation of overcurrent fusing resistor, thereby other device in the protective circuit of open circuit loop is not damaged.
Alternatively, as shown in Figure 2, the LED drive circuit that this enforcement provides can also comprise voltage stabilizing inductance L and discharge resistance R3, voltage stabilizing inductance L first end is used for being connected to exchanging inputs live wire, described voltage stabilizing inductance the second end is connected to the input of reduction voltage circuit, and the first end of piezo-resistance RV is connected to voltage stabilizing inductance the 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 the first end of insurance resistance R N.Wherein, discharge resistance R3, in the time that circuit turn-offs, gives the electric discharge of voltage stabilizing inductance L, prevents that L from feeling high voltage in circuit judges moment and damaging the device in circuit.
Alternatively, as shown in Figure 2, the LED drive circuit that this enforcement provides can also comprise ac filter circuit 106, wherein,
Ac filter circuit 106 comprises the second capacitor C 2 and the second resistance R 4, the first end of C2 is used for being connected to exchanging inputs live wire, the second end of C2 is used for being connected to exchanging inputs zero line, and the first end of R4 is used for being connected to exchanging inputs zero line, and the second end of R4 is used for being connected to interchange input zero line.
Wherein, C2, R4 are for being carried out filtering to line voltage.
Alternatively, as shown in Figure 2, the LED drive circuit that this enforcement provides can also comprise DC filtering circuit 107, wherein,
DC filtering circuit 107 comprises filter inductance L1 and the 3rd capacitor C 3, and the first end of L1 is connected to the cathode output end of rectification circuit 102, and the defeated output of positive pole that the second end of L1 is LED drive circuit is for connecting the positive pole of LED.
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, for the output voltage of rectification circuit is carried out to filtering, obtains DC voltage waveform stably.
The LED drive circuit that the present embodiment provides; the AC-input voltage of electrical network is reduced in the operating voltage range of LED by reduction voltage circuit; by supplying with LED after rectification circuit rectification; and circuit has overvoltage crowbar and current foldback circuit can effectively prevent the surge voltage of electrical network and the infringement that load short circuits causes circuit; voltage stabilizing inductance can play the effect of stablizing output end voltage in the time of voltage ripple of power network, ensures the brightness of LED.LED drive circuit provided by the invention is because circuit is simple, and the device of use is few, and reliability is high, and cost is low.
Please refer to Fig. 3, Fig. 3 is the circuit diagram of a kind of LED lamp of providing of the embodiment of the present invention, comprising: the LED drive circuit described in LED and Fig. 1 or Fig. 2 embodiment, wherein, the positive pole of LED is connected to the cathode output end of LED drive circuit, and the negative pole of LED is connected to the cathode output end of LED drive circuit.
Alternatively, LED comprises at least 4 LEDs, and LED can be connected between the cathode output end and cathode output end of LED drive circuit with in parallel, the rear mode in parallel of connecting or first connect.
For example, the connected mode of the small-power straw hat type LED of 60 0.06W can be 15 also, and 4 strings, (do not draw whole parallel branches) as shown in Figure 3 in the lump.
The LED lamp that the present embodiment provides is because drive circuit is simple, and the device of use is few, and therefore reliability is high, and cost is low.
Above disclosed is only preferred embodiment of the present invention, certainly can not limit with this interest field of the present invention, and the equivalent variations of therefore doing according to the claims in the present invention, still belongs to the scope that the present invention is contained.
Claims (7)
1. a LED drive circuit, is characterized in that, comprising: reduction voltage circuit, current-limiting resistance, rectification circuit, current foldback circuit and overvoltage crowbar, wherein,
The input of described reduction voltage circuit is used for being connected to exchanging inputs live wire, the output of described reduction voltage circuit is connected to the first input end of described rectification circuit, and the cathode output end that the cathode output end of described rectification circuit is described LED drive circuit is for being connected to the positive pole of LED;
The first end of described current-limiting resistance be the cathode output end of described LED drive circuit for being connected to the negative pole of LED, the second end of described current-limiting resistance is connected to the cathode output end of described rectification circuit;
The second input of described rectification circuit is connected to the first end of described current foldback circuit, and the second end of described current foldback circuit is used for being connected to exchanging inputs zero line;
The first end of described overvoltage crowbar is used for being connected to exchanging inputs live wire, and the second end of described overvoltage crowbar is connected to the first end of described current foldback circuit.
2. circuit according to claim 1, is characterized in that,
Described reduction voltage circuit comprises the first electric capacity and the first resistance, and described the first electric capacity and described the first resistance are connected in parallel, the input that one end of described the first electric capacity is described reduction voltage circuit, the output that the other end of described the first electric capacity is described reduction voltage circuit;
Described current foldback circuit comprises insurance resistance, and the first end of described insurance resistance is connected to the second input of described rectification circuit, and the second end of described insurance resistance is used for being connected to exchanging inputs zero line;
Described overvoltage crowbar comprises piezo-resistance, and the first end of described piezo-resistance is used for being connected to exchanging inputs live wire, and the second end of described piezo-resistance is connected to the first end of described insurance resistance.
3. circuit according to claim 2, is characterized in that, described circuit also comprises voltage stabilizing inductance and discharge resistance, wherein,
Described voltage stabilizing inductance first end is used for being connected to exchanging inputs live wire, and described voltage stabilizing inductance the second end is connected to the input of reduction voltage circuit, and the first end of described piezo-resistance is connected to voltage stabilizing inductance the second end;
The first end of described discharge resistance is connected to the second end of described voltage stabilizing inductance, and the second end of described discharge resistance is connected to the first end of described insurance resistance.
4. according to the circuit described in claims 1 to 3 any one, it is characterized in that, described circuit also comprises ac filter circuit, wherein,
Described ac filter circuit comprises the second electric capacity and the second resistance, the first end of described the second electric capacity is used for being connected to exchanging inputs live wire, the second end of described the second electric capacity is used for being connected to exchanging inputs zero line, the first end of described the second resistance is used for being connected to exchanging inputs zero line, and the second end of described the second resistance is used for being connected to exchanging inputs zero line.
5. circuit according to claim 4, is characterized in that, described circuit also comprises DC filtering circuit, wherein,
Described DC filtering circuit comprises filter inductance and the 3rd electric capacity, the first end of described filter inductance is connected to the cathode output end of described rectification circuit, and the cathode output end that the second end of described filter inductance is described LED drive circuit is for being connected to the positive pole of LED;
The first end of described the 3rd electric capacity is connected to the second end of described filter inductance, and the second end of described the 3rd electric capacity is connected to the cathode output end of described rectification circuit.
6. a LED lamp, it is characterized in that, comprise the circuit described in LED and claim 1 to 5 any one, wherein, the positive pole of described LED is connected to the cathode output end of described LED drive circuit, and the negative pole of described LED is connected to the cathode output end of described LED drive circuit.
7. LED lamp according to claim 6, is characterized in that, described LED comprises at least 4 LEDs, and described LED is connected between the cathode output end and cathode output end of described LED drive circuit with in parallel, the rear mode in parallel of connecting or first connect.
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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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| CN201310099715.2A CN104080221B (en) | 2013-03-26 | 2013-03-26 | A kind of LED drive circuit and LED light |
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| WO2021043269A1 (en) * | 2019-09-06 | 2021-03-11 | 嘉兴山蒲照明电器有限公司 | Surge protection circuit, power supply device using same, and led illumination device |
| WO2021120490A1 (en) * | 2019-12-18 | 2021-06-24 | 杭州泰格电子电器有限公司 | Led light bulb of he solution and manufacturing process therefor |
| CN114269050A (en) * | 2022-03-02 | 2022-04-01 | 深圳市暗能量电源有限公司 | LED lamp protection circuit and electronic equipment |
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| CN104080221B (en) | 2018-05-08 |
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