CN202663604U - Led lamp driving circuit - Google Patents
Led lamp driving circuit Download PDFInfo
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- CN202663604U CN202663604U CN 201220204230 CN201220204230U CN202663604U CN 202663604 U CN202663604 U CN 202663604U CN 201220204230 CN201220204230 CN 201220204230 CN 201220204230 U CN201220204230 U CN 201220204230U CN 202663604 U CN202663604 U CN 202663604U
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Abstract
The utility model provides a fully-functional protective LED lamp driving circuit, which processes alternating current of an input power supply and then inputs the alternating current to an LED lamp, and the LED lamp comprises one LED or a plurality of LEDs connected in series. The LED lamp driving circuit comprises a voltage reduction module, a rectifier module, a filter element, an over-current protection module, a soft start element, an overvoltage protection module, an anti-static module and an LED open-circuit short-circuit protection module. The filter element is connected to both ends of the rectifier module, converts alternating current into direct-current voltage and inputs the direct-current voltage to the anode of the LED lamp; the over-current protection module, the soft start element and the over-voltage protection module are electrically connected in sequence, are further connected to the cathode of the LED lamp and form a current loop with the rectifier module and the filter element; and the anti-static module and the LED open-circuit short-circuit protection module are connected in parallel with the LED lamp.
Description
Technical field
The utility model relates to a kind of light-emitting diode (LED, Light Emitting Diode) Driving technique, and particularly exchanges input LDE lamp drive circuit relevant for a kind of full guard function.
Background technology
At the society of the energy of advocating thriftiness, LED is extensively favored because of the characteristics of its low power consuming.LED, i.e. light-emitting diode, it has two ends, and an end is anode, and the other end is negative electrode.The basic functional principle of LED is, inspires photon in the semiconductor in inside when having electric current to flow through negative electrode from anode, produced visible light.If its voltage is for negative, namely when the voltage of cathode terminal was higher than anode tap, LED was reverse biased, and LED is in not on-state, and is namely not luminous.Therefore, for make LED can be as common bulb continuous luminous, then need to convert the alternating current that the city uses to direct current with a kind of circuit.Alternating current is exactly periodically positive and negative replacing of its polarity of voltage, and direct current is the voltage that polarity does not replace.So, a kind ofly convert alternating current to adjustable controlled galvanic circuit, be called drive circuit, be essential.In the application of LED lamp, led drive circuit converts the 220V alternating current of family expenses to specified direct current, for LED provides direct current from the anode to the negative electrode, so that the LED continuous luminous.
If LED works in its working range, its life-span is very long.If but condition of work surpasses its license working range, LED is easily damaged.In the operational environment of reality, for example the electrical network of family expenses has several factors can cause the state of LED overvoltage or overcurrent, and these states will make LED be damaged.Therefore in led drive circuit, must be protected LED.
In the existing led drive circuit, overvoltage protection is only arranged generally.The element that is used for overvoltage protection mainly is TVS (TVS), Zener diode (Zener), piezo-resistance (MOV) etc.These elements are across the two ends of the part that needs protection.When overvoltage occurs, such element with too high voltage clamp in rated value.Yet such overvoltage protection parameter often has very wide variation (being generally more than 10%), and precision is inadequate, and these elements had just begun to have leakage current to occur before protection point arrives, thereby so that the electrical efficiency of drive circuit reduce.
Some drive circuits do not have overvoltage protection but overcurrent protection are arranged, because one of damage chief reason of LED is overcurrent.The most basic overcurrent protection is fuse protected.Excessive to a certain extent the time when electric current, the electric current in the fuse produces enough heats so that fuse opening.Such protection has several large shortcomings, can't recover after being fuse opening; The 2nd, variation is in a big way arranged; The 3rd, the overcurrent striking point is subject to ambient temperature effect.When ambient temperature was high, obviously lower electric current just can be with fuse opening; The 4th, reaction speed is slow, is approximately a second level.In the time of might working as fuse failure, LED has been subjected to certain injury.Therefore, such overcurrent protection has precision to hang down and insecure shortcoming.Some drive circuit has used and can recover fuse.Except can reusable benefit, other problem still exists.Some drive circuit has used the thermistor (PTC) of positive temperature coefficient in addition.When electric current was increased to the protection point, the heat that overcurrent produces was so that the resistance of thermistor increases greatly, and electric current reduces greatly, thereby reaches the purpose of clamping down on electric current.Thermistor is except recovering, and outside continuing to flow, the other problems that fuse has still exists, particularly low precision and problem influenced by ambient temperature.
Soft start exactly when adding input voltage so that LED when starting working, if the electric current among the LED is to be increased to gradually rated value, is soft start.Otherwise be hard reboot, hard reboot tends to produce overvoltage or overcurrent phenomenon, and initial start stage often defencive function not yet set up complete so that LED is damaged.Also do not consider the problem of soft start in the existing drive circuit, so a lot of LED lamp product is damaged when starting.
LED is semiconductor device, and semiconductor device is easy to be decreased the bosom after being heated, and greatly shortens the life-span of product.And LED has the light decay phenomenon.Be that excess Temperature can cause that luminous quantity reduces.Luminous quantity can also recover automatically after temperature lowers in certain temperature range.But surpass uniform temperature, LED is subject to nonvolatil injury, and luminous quantity just can not recover again, greatly reduces life of product.This type of heat protection function was not yet arranged in the existing product.
Along with the increase to LED lamp power requirement, several LED are connected in parallel often.Be compared to series connection, even benefit in parallel is to have a LED to damage open circuit, still can not affect the function of other LED, but shortcoming be to need large electric current.And electric current is so that power consumption is large greatly, and temperature rises, and the circuit volume increases.And if series connection then can reduce loss, reduce temperature, reduce volume.But owing to being series connection, if there is LED impaired and open a way, electric current just is cut off so, and whole LED is just no longer luminous; The short circuit if any one LED is impaired, electric current can increase so, so that other LED are subject to further damage because of overcurrent.This is the reason that existing product generally uses parallel circuits.
In addition, as semiconductor element, LED be easy to because of static impaired.Existing product great majority are not all considered this problem, also thereby making, test, in the processes such as transportation so that LED suffer damage.
The utility model content
For the problems referred to above, the purpose of this utility model provides a kind of LED lamp drive circuit, and it carries out the global function protection to the LED lamp, has more reaction speed fast, the characteristics that precision is high.
The utility model proposes a kind of LED lamp drive circuit, input to the LED lamp after its ac process with input power, this LED lamp comprises a plurality of LED of a LED or series connection.This LED lamp drive circuit comprises voltage reduction module, rectification module, filter element, overcurrent protection module, soft start element, overvoltage protective module, antistatic module and LED open circuit short circuit protection module.Described filter element is connected across the rectification module two ends, and alternating current is converted to direct voltage, and inputs to the LED lamp anode; Described overcurrent protection module, soft start element, overvoltage protective module are electrically connected successively, and further are connected to described LED lamp cathode, and then form current circuit with described rectification module and filter element.Described antistatic module and LED open circuit short circuit protection module are all in parallel with the LED lamp.
In an embodiment of the present utility model, described rectification module comprises the first diode, the second diode, the 3rd diode, the 4th diode, reaches the circuit of the first resistance, the formation of the second resistance, the anodic bonding of the first diode is to the positive voltage terminal of input power, negative electrode links to each other with the negative electrode of the 4th diode, further by the plus earth of the 4th diode; The negative electrode of the 3rd diode is connected to the positive voltage terminal of input power, the anodic bonding of anode and the second diode, and further by the minus earth of the second diode, the first resistance one end is connected to the node between the first diode and the 4th diode, the other end is connected to the node between the 3rd diode and the second diode, and the second resistance is connected across the two ends of the second diode.
In an embodiment of the present utility model, described filter element is filter capacitor, and when input voltage enters rectification module, rectification module is converted into the positive and negative sine wave that replaces the sine wave of forward, and is further filtered into direct voltage by described filter capacitor.
In an embodiment of the present utility model, the degree of voltage direct current depends on filter capacitor after the described filtration, capacitance larger more close to direct current.
In an embodiment of the present utility model; described overcurrent protection module is realized by the circuit that the first control element, the 3rd resistance, the 4th resistance, the 5th resistance and the first Zener diode form; the drain electrode of the first control element is connected with the negative electrode of LED lamp; source electrode is connected with the 5th resistance one end, the 5th resistance other end ground connection.The 4th resistance one end is connected to the positive voltage terminal of input voltage, and the other end is connected to the negative electrode of the first Zener diode, the further ground connection of the anode of the first Zener diode; The gate pole of the first control element is connected between the 4th resistance and the Zener diode by the 3rd resistance.
In an embodiment of the present utility model, described the 5th resistance is realized an overheating protective element, and the 5th resistance is the thermistor of positive temperature coefficient.
In an embodiment of the present utility model; described overvoltage protective module is by the second control element and the 6th resistance; the circuit that the 7th resistance and the second Zener diode form is realized; the 6th resistance one end is connected to the positive voltage terminal of input power; the other end is connected to the negative electrode of the second Zener diode; and further with ground connection again after the 7th resistance is connected; the drain electrode of the second control element is connected to the gate pole of the first control element; the source ground of the second control element, and gate pole is connected between the 7th resistance and the second Zener diode.
In an embodiment of the present utility model, described soft start element is realized by an electric capacity, this electric capacity is with after one the 8th resistance is in parallel, one end is connected to the gate pole of the first control element, other end ground connection, wherein, the value of this electric capacity has determined the time of soft start, and the time of the larger startup of value of electric capacity is longer.
In an embodiment of the present utility model, described antistatic module is realized by the resistance that is connected across respectively LED lamp two ends.
In an embodiment of the present utility model, described LED open circuit short circuit protection module is by realizing with the Zener diode of each LED lamp reverse parallel connection respectively with respectively.
In an embodiment of the present utility model, described the first and second control elements are the field effect transistor of N-type, and the 8th resistance is the negative tempperature coefficient thermistor of a switching mode.
LED lamp drive circuit described in the utility model, it carries out the global function protection to the LED lamp, comprises overvoltage protection, overcurrent protection; the overtemperature protection, soft start, and the short-circuit protection relevant with LED itself; open-circuit-protection and electrostatic protection have more reaction speed fast, the characteristics that precision is high.
Above-mentioned explanation only is the general introduction of technical solutions of the utility model, for can clearer understanding technological means of the present utility model, and can be implemented according to the content of specification, and for above-mentioned and other objects, features and advantages of the present utility model can be become apparent, below especially exemplified by embodiment, and the cooperation accompanying drawing, be described in detail as follows.
Description of drawings
Fig. 1 is the module map of LED circuit for lamp of the whole interchange input of the utility model preferred embodiment.
Fig. 2 is the artificial circuit figure of LED circuit for lamp of the whole interchange input of the utility model preferred embodiment.
Fig. 3 be the utility model preferred embodiment be the input mode chart of input power.
Fig. 4 is the simulation result of circuit shown in Figure 2.
Fig. 5 is the LED lamp current waveform figure of soft start-up process.
Embodiment
The utility model is a simple low cost, is easy to make the special led drive circuit of debugging.This circuit has all defencive functions, comprises overvoltage protection, overcurrent protection, soft start, overtemperature protection, electrostatic protection, and the open circuit of LED and short-circuit protection etc.Compare with existing drive circuit, it is fast that the utility model has more reaction speed, the characteristics that precision is high.This circuit can also be used for having the occasion of dimmer switch, so that the light modulation of LED lamp is achieved.
Please refer to Fig. 1, it is the module map of LED circuit for lamp of the whole interchange input of the utility model preferred embodiment.The LED circuit for lamp of whole interchange input comprises LED lamp drive circuit 100, input power 200 and LED lamp 300.Wherein, input power 200 is the AC power importation, and LED lamp drive circuit 100 is converted to DC power supply with the AC power of input power 200 outputs, further inputs to LED lamp 300.
Further, LED lamp drive circuit 100 also comprises voltage reduction module 109, rectification module 101, filter element 102, overcurrent protection module 103, overheating protective element 104, soft start element 105, overvoltage protective module 106, antistatic module 107 and LED open circuit short circuit protection module 108.Wherein, voltage reduction module 109 is connected to input power 200, is used for carrying out dividing potential drop or step-down according to the voltage that the output needs are inputted input power 200.Rectification module 101 is connected to voltage reduction module 109, the positive and negative alternating voltage that replaces is converted to the alternating voltage of forward, be about to the sine wave that the positive and negative sine wave that replaces is converted into forward, via filter element 102 alternating current is converted to direct voltage again, this direct voltage is 300 power supplies from positive voltage terminal to the LED lamp.In addition, LED lamp 300 and then be electrically connected successively with overcurrent protection module 103, soft start element 105, overvoltage protective module 106, overheating protective element 104 is electrically connected with overcurrent protection module 103.Described overcurrent protection module 103, soft start element 105, overvoltage protective module 106 are electrically connected with LED lamp 300, rectification module 101 and filter element 102 respectively and form current circuit.Antistatic module 107 is connected respectively with the LED lamp with LED open circuit short circuit protection module 108; wherein antistatic module 107 is used for eliminating the static that occurs on LED lamp D5 and the D10; LED open circuit short circuit protection module 108 is used for the short-circuit protection of opening a way to the LED lamp D5 of series connection and D10; when wherein open circuit or short circuit phenomenon appear in any LED lamp; the LED lamp of other series connection still works, and is not opened a way or the impact of short circuit.
In details of the words, please with further reference to Fig. 2, it is the artificial circuit figure of LED circuit for lamp of the whole interchange input of the utility model preferred embodiment.In conjunction with Fig. 1 and Fig. 2, in order to utilize series LED efficiently and the little characteristics of volume, connect as an example with two LED in the present embodiment, and do not limit number in the practical application, do not limit how many roads yet.That is, in the present embodiment, LED lamp 300 comprises that label is two LED lamps of D5 and D10.Input power 100 comprises the voltage of the alternating current 220V that label V1 represents and the interference voltage of label V2 representative, and this interference voltage for example has the voltage spine.In conjunction with shown in Figure 3; it is the input mode chart of input power 200, and the input voltage of V1 representative is the same sine wave with the power supply of daily family, and negative voltage side ground connection; the interference voltage of V2 representative is the situation that the imitation input has the voltage spine, verifies defencive function in order to produce overvoltage.
In the analogous diagram of the present embodiment, resistance R 4 is connected to the positive voltage terminal of input power 200, and herein, resistance R 4 realizes the function of voltage reduction module 108, and in the practical application, voltage reduction module 108 also can be realized by step-down or bleeder circuit.Rectification module 101 comprises diode D1, D2, D3, D4, resistance R 1, R2.Wherein, the anodic bonding of diode D1 is to resistance R 4, and the negative electrode of diode D1 links to each other with the negative electrode of diode D4, further by the plus earth of diode D4.The negative electrode of diode D3 is connected to the positive voltage terminal of input power 200, the anodic bonding of the anode of diode D3 and diode D2, and further by the minus earth of diode D2, resistance R 1 one ends are connected to the node between diode D1 and the D4, the other end is connected to the node between diode D3 and the D2, and resistance R 2 is connected across the two ends of diode D2.
In the present embodiment, filter element 102 is filter capacitor C4, is connected across rectification module 101 two ends.Enter the rectification module 101 that forms to D4 with diode D1 when input voltage, this rectification module 101 is converted into the positive and negative sine wave that replaces the sine wave of forward.Sine wave after this is folding is filtered into direct voltage by the filter capacitor C4 across these two ends.As shown in Figure 2, its positive voltage is in the upper end of circuit, and earth point is in the circuit lower end.The degree of voltage direct current depends on C4 electric capacity after filtering, capacitance larger more close to direct current.
In the present embodiment, overcurrent protection module 103 is by the first control element M2, resistance R 7, R11, R13 and Zener diode D6 realization, and wherein, what the first control element M2 used in the present embodiment emulation is the field effect transistor (NMOSFET) of a N-type.Overheating protective element 104 is realized by resistance R 13.Soft start element 105 is realized by capacitor C 1; overvoltage protective module 106 is by the second control element M3 and resistance R 9; the circuit realization that R10 and Zener diode D7 form, what the second control element M3 used in the present embodiment emulation is the field effect transistor (NMOSFET) of a N-type.In the present embodiment, antistatic module 107 realizes by the resistance R 3, the R6 that are connected across respectively LED lamp D5 and D10 two ends, and LED open circuit short circuit protection module 108 is by realizing with Zener diode D8, the D9 of each LED lamp reverse parallel connection respectively with respectively.
In details of the words, the drain D of the first control element M2 is connected with the negative electrode of LED lamp D10, and source S is connected with resistance R 13 1 ends, resistance R 13 other end ground connection.Resistance R 11 1 ends are connected to the positive voltage terminal of input voltage, and the other end is connected to the negative electrode of Zener diode D6, the further ground connection of the anode of Zener diode D6.The gate pole G of the first control element M2 is connected between resistance R 11 and the Zener diode D6 by resistance R 7.
After capacitor C 1 and resistance R 8 were in parallel, an end was connected to the gate pole G of the first control element M2, other end ground connection.
Resistance R 9 one ends are connected to the positive voltage terminal of input power, and the other end is connected to the negative electrode of Zener diode D7, and further with ground connection again after resistance R 10 is connected.The drain D of the second control element M3 is connected to the gate pole G of the first control element M2, the source S ground connection of the second control element M3, and gate pole G is connected between resistance R 10 and the Zener diode D7.
In a preferred embodiment, LED lamp drive circuit 100 is made with the form of integrated circuit, and resistance R 13 is as a current limliting and temperature detection resistance, and its value need to be adjusted according to different conditions of work, therefore is located at outside the integrated circuit separately.
The operation principle of LED lamp is as described below in the present embodiment.
Flow through LED lamp D5 and D10 via the direct voltage after rectification module 101 and filter element 102 processing from positive voltage terminal, then flow through control switch M2 and get back to ground connection by current limliting and temperature protection resistance R 13, form current circuit, lightening LED lamp D5 and D10.
The gate pole G of the first control element M2 is provided by resistance R 11 and Zener diode D6 the voltage of source S, and when this voltage is enough high (for example, being 15V in emulation), the drain D of the first control element M2 is to the full conducting of source S, otherwise complete shut-down is disconnected.So, the first control element M2 is equivalent to a control switch.And if the drain electrode utmost point of the first control element M2 to the voltage of source electrode at certain intermediate point, its resistance from drain-to-source increases, but still conducting.Utilized these characteristics to clamp down on electric current in the present embodiment.Particularly, select the value of resistance R 13 according to the requirement of maximum LED electric current, its value can be elected as and allow under normal circumstances full conducting of the first control element M2, or the choosing value makes by the electric current of LED lamp 100 and just clamped down on certain value.For example be 60mA in emulation.Voltage on resistance R 13 is that electric current multiply by resistance.And because the voltage on the gate pole is fixed, the gate pole utmost point is that gate voltage deducts the voltage on the resistance R 13 to the voltage of source electrode like this.If the overcurrent situations in the LED lamp 300 occurs, the voltage increases on the resistance R 13 causes the G utmost point of M2 to the lower voltage of the S utmost point so.The result as mentioned above, the resistance of the drain-to-source of M2 increases, so that reduce by the electric current of LED, reaches the purpose of overcurrent protection.Resistance R 13 can be the thermistor (PTC) of a positive temperature coefficient, and namely its resistance value also rises when temperature rises, and the result has reached the function of overtemperature protection.The present embodiment has utilized the characteristics of field effect transistor, use one cheaply resistance reached simultaneously the function of overcurrent and overtemperature protection, protected the LED can be not damaged or damage and cause light decay.
If wish to turn-off drive circuit in some application scenario when overheated, resistance R 8 can be realized by the negative tempperature coefficient thermistor (NTC) of a switching mode.When temperature reached limit value, the resistance of thermistor changed to very little (for example several ohm) from very large (for example hundreds of kilohm).
In order to protect better LED, in the present embodiment, on the basis of the first control element M2, further increase overvoltage protection.The G that the drain D 3 of the second control element M3 is connected to the first control element M2 extremely goes up, source S 3 ground connection of the second control element M3.When the drain D 3 of the second control element M3 is shorted to ground connection, equal the gate pole G ground connection of the first control element M2, that is to say the first control element M2 is disconnected, stop drive circuit works.So, as long as the voltage of the drain electrode G3 of control the second control element M3 just can come switch the first control element M2 by the second control element M3.In the present embodiment, the gate pole G3 voltage of the second control element M3 is controlled by the circuit of resistance R 9, R10 and Zener diode D7.The negative electrode C that is added to Zener diode by resistance when direct voltage is during to anode A, if voltage is enough high, so that Zener diode D7 is from negative electrode to the anode conducting, produces a fixing voltage from the C utmost point to the A utmost point on Zener diode D7.Resistance R 9 and R10 form a voltage divider and are added to the gate pole G3 of the second control element M3 by Zener diode D7 after with rectification and filtered direct voltage dividing potential drop.When normal operation, because the undertension after the dividing potential drop is not so that Zener diode D7 conducting has voltage on the gate pole G3 of the first control element M2, so the second control element M3 is in off state.And the fixed voltage that is produced by Zener diode D6 and resistance R 11 is added to by resistance R 7 on the gate pole G of the first control element M2, so that the first control element M2 conducting, the drive circuit normal operation.And when input voltage was too high, this voltage was got through Zener diode D7, was added on the gate pole G3 of the second control element M3, so that the second control element M3 conducting.This is so that the drain D 3 of the second control element M3 is shorted to ground connection.So just the gate pole G of the first control element M2 is shorted to ground connection.Because the gate pole G of the first control element M2 does not have enough voltage, so the first control element M2 turn-offs, stop the work of drive circuit, played the effect of overvoltage protection.Because this protection is the gate pole G of instantaneous short-circuit the first control element M2, its reaction speed is Microsecond grade.Like this, with overcurrent protection together, LED has obtained duplicate protection.
The capacitor C 1 that connects at the gate pole G of the first control element M2 has played the effect of soft start.Because capacitor charging needs the time, so when starting, the voltage on the gate pole G of the first control element M2 slowly raises, so that the first control element M2 slowly is opened to full conducting.The value of capacitor C 1 has determined the time of soft start.The time of the larger startup of value of capacitor C 1 is longer.
Moreover, in order to utilize series LED efficiently and the characteristics of volume, must solve LED and connect a rear damage open circuit with regard to the obstructed problem in whole road, used two LED series connection in the artificial circuit of the present embodiment as an example, and do not limit number in the practical application, do not limit how many roads yet.Be connected in reverse parallel on each LED by Zener diode, namely Zener diode D8 and D9 are connected in reverse parallel in respectively on LED lamp D5 and the D10.The negative electrode of Zener diode D8 and D9 is selected than the forward conduction voltage height of LED lamp D5 and D10 a bit to the conducting voltage of anode.If LED lamp D5 and D10 do not damage, because the voltage of Zener diode D8 and D9 will be higher than the conducting voltage of LED lamp D5 and D10, so electric current flows through LED lamp D5 and D10, Zener diode D8 and D9 be impact not.Open a way if LED lamp D5 damages, voltage is added in the upper so that diode current flow of Zener diode D8, and electric current flows into LED(such as the D10 of other series connection through Zener diode D8), drive circuit continues maintenance work.Solved like this problem of the open circuit of series LED.If it is the road that individual LED is arranged, the electric current that flows through LED will be tending towards increasing.But because the overcurrent protection meeting with current clamp on rated value, therefore can not cause the LED overcurrent to damage.
Resistance R 3 and R6 are used for preventing electrostatic damage LED lamp D5 and D10.When static produced in any direction, resistance R 3, R6 guaranteed can overvoltage not damage on the LED two ends.Being connected in reverse parallel in Zener diode on the LED also provides the passage of static discharge, so LED is again by duplicate protection.
Whole circuit comprises that defencive function has carried out simulating, verifying.Figure 4 shows that the simulation result of circuit shown in Figure 2.The waveform of label 41 indications is the direct voltage behind the rectifying and wave-filtering, and voltage is flushed to more than the 400V from 150V.The waveform of label 42 indications is the current waveform of LED lamp the inside.Can see, although the spine amplitude of voltage is very large, on almost electric current not being affected.Electric current is clamped at below the 60mA.And when overtension, triggering overvoltage protection, drive circuit is turned off.The electric current that can see LED from the result drops to rapidly zero.Figure 5 shows that the LED lamp current waveform figure of soft start-up process.This is the LED current waveform when soft start capacitor C 1 is 100pF.
In sum, the utility model has been realized the led drive circuit of global function protection by simple and effective circuit, and its overvoltage protection is faster more accurate than prior art.The reaction speed of overcurrent protection from second level shorten to Microsecond grade, greatly reduced the impaired possibility of LED.The utility model utilization very simply cheaply circuit has realized overcurrent current-limiting protection and overtemperature protection simultaneously.Utilize in addition simple and reliable circuit to realize soft start.Further, the utility model has designed the global function protection problem that simple and effective circuit has solved series LED.
The above, only be embodiment of the present utility model, be not that the utility model is done any pro forma restriction, although the utility model discloses as above with embodiment, yet be not to limit the utility model, any those skilled in the art, within not breaking away from the technical solutions of the utility model scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be not break away from the technical solutions of the utility model content, any simple modification that foundation technical spirit of the present utility model is done above embodiment, equivalent variations and modification all still belong in the scope of technical solutions of the utility model.
Claims (12)
1. a LED lamp drive circuit inputs to the LED lamp after its ac process with input power, and this LED lamp comprises a plurality of LED of a LED or series connection; It is characterized in that, this LED lamp drive circuit comprises:
Voltage reduction module is connected to input power;
Rectification module is connected to voltage reduction module;
Filter element, be connected across the rectification module two ends, rectification module converts the positive and negative alternating voltage that replaces to the alternating voltage of forward, is about to the sine wave that the positive and negative sine wave that replaces is converted into forward, via filter element alternating current is converted to direct voltage again, and inputs to the LED lamp anode;
Overcurrent protection module;
The soft start element;
Overvoltage protective module, this overcurrent protection module, soft start element, overvoltage protective module are electrically connected successively, and further are connected to described LED lamp cathode, and then form current circuit with described rectification module and filter element;
The antistatic module, in parallel with the LED lamp; And
The LED short circuit protection module of opening a way, in parallel with the LED lamp.
2. LED lamp drive circuit according to claim 1, it is characterized in that, described rectification module comprises the first diode, the second diode, the 3rd diode, the 4th diode, reaches the circuit of the first resistance, the formation of the second resistance, the anodic bonding of the first diode is to the positive voltage terminal of input power, negative electrode links to each other with the negative electrode of the 4th diode, further by the plus earth of the 4th diode; The negative electrode of the 3rd diode is connected to the positive voltage terminal of input power, the anodic bonding of anode and the second diode, and further by the minus earth of the second diode, the first resistance one end is connected to the node between the first diode and the 4th diode, the other end is connected to the node between the 3rd diode and the second diode, and the second resistance is connected across the two ends of the second diode.
3. LED lamp drive circuit according to claim 1, it is characterized in that, described filter element is filter capacitor, when input voltage enters rectification module, rectification module is converted into the positive and negative sine wave that replaces the sine wave of forward, and is further filtered into direct voltage by described filter capacitor.
4. LED lamp drive circuit according to claim 2 is characterized in that, the degree of voltage direct current depends on filter capacitor after the described filtration, capacitance larger more close to direct current.
5. LED lamp drive circuit according to claim 3; it is characterized in that; described overcurrent protection module is realized by the circuit that the first control element, the 3rd resistance, the 4th resistance, the 5th resistance and the first Zener diode form; the drain electrode of the first control element is connected with the negative electrode of LED lamp; source electrode is connected with the 5th resistance one end, the 5th resistance other end ground connection.
6. the 4th resistance one end is connected to the positive voltage terminal of input voltage, and the other end is connected to the negative electrode of the first Zener diode, the further ground connection of the anode of the first Zener diode; The gate pole of the first control element is connected between the 4th resistance and the Zener diode by the 3rd resistance.
7. LED lamp drive circuit according to claim 5 is characterized in that, described the 5th resistance is realized an overheating protective element, and the 5th resistance is the thermistor of positive temperature coefficient.
8. LED lamp drive circuit according to claim 5; it is characterized in that; described overvoltage protective module is by the second control element and the 6th resistance; the circuit that the 7th resistance and the second Zener diode form is realized; the 6th resistance one end is connected to the positive voltage terminal of input power; the other end is connected to the negative electrode of the second Zener diode; and further with ground connection again after the 7th resistance is connected; the drain electrode of the second control element is connected to the gate pole of the first control element; the source ground of the second control element, and gate pole is connected between the 7th resistance and the second Zener diode.
9. LED lamp drive circuit according to claim 5, it is characterized in that, described soft start element is realized by an electric capacity, this electric capacity is with after one the 8th resistance is in parallel, one end is connected to the gate pole of the first control element, other end ground connection, wherein, the value of this electric capacity has determined the time of soft start, and the time of the larger startup of value of electric capacity is longer.
10. LED lamp drive circuit according to claim 1 is characterized in that, described antistatic module is realized by the resistance that is connected across respectively LED lamp two ends.
11. LED lamp drive circuit according to claim 1 is characterized in that, described LED open circuit short circuit protection module is by realizing with the Zener diode of each LED lamp reverse parallel connection respectively.
12. LED lamp drive circuit according to claim 1 is characterized in that described the first and second control elements are the field effect transistor of N-type, the 8th resistance is the negative tempperature coefficient thermistor of a switching mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220204230 CN202663604U (en) | 2012-05-09 | 2012-05-09 | Led lamp driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220204230 CN202663604U (en) | 2012-05-09 | 2012-05-09 | Led lamp driving circuit |
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| Publication Number | Publication Date |
|---|---|
| CN202663604U true CN202663604U (en) | 2013-01-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220204230 Withdrawn - After Issue CN202663604U (en) | 2012-05-09 | 2012-05-09 | Led lamp driving circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102711323A (en) * | 2012-05-09 | 2012-10-03 | 江苏应能微电子有限公司 | LED (light emitting diode) lamp drive circuit |
| CN107708251A (en) * | 2017-09-29 | 2018-02-16 | 无锡昊瑜节能环保设备有限公司 | A kind of intelligent LED drive control device of energy-conservation |
-
2012
- 2012-05-09 CN CN 201220204230 patent/CN202663604U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102711323A (en) * | 2012-05-09 | 2012-10-03 | 江苏应能微电子有限公司 | LED (light emitting diode) lamp drive circuit |
| CN102711323B (en) * | 2012-05-09 | 2015-11-25 | 江苏应能微电子有限公司 | LED lamp drive circuit |
| CN107708251A (en) * | 2017-09-29 | 2018-02-16 | 无锡昊瑜节能环保设备有限公司 | A kind of intelligent LED drive control device of energy-conservation |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130109 Effective date of abandoning: 20151125 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |