CN104968106A - LED drive circuit compatible with high-frequency electronic ballast and low-frequency input - Google Patents
LED drive circuit compatible with high-frequency electronic ballast and low-frequency input Download PDFInfo
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Abstract
The invention discloses an LED drive circuit compatible with a high-frequency electronic ballast and a low-frequency input. The LED drive circuit includes a voltage reduction circuit, a rectification circuit, a protection circuit, a filter circuit and a load circuit. The voltage reduction circuit is connected to the input end of the rectification circuit. The output end of the rectification circuit, the filter circuit and the load circuit are sequentially connected in parallel. The protection circuit includes a sampling feedback circuit and a unidirectional silicon controlled rectifier. The anode and the cathode of the unidirectional silicon controlled rectifier are connected to the anode output end and the cathode output end of the rectification circuit respectively. The control electrode of the unidirectional silicon controlled rectifier is connected to the sampling feedback circuit. The sampling feedback circuit is connected to the rectification circuit and the load circuit. The sampling feedback circuit controls conduction of the unidirectional silicon controlled rectifier. The LED drive circuit can be used for a high-frequency electronic ballast and also a low-frequency input such as a commercial power input. The protection circuit is adopted by the LED drive circuit to achieve overvoltage and overcurrent protection. The LED drive circuit is simple, practical, and highly reliable.
Description
Technical field
The present invention relates to field of LED illumination, particularly relate to the LED drive circuit of a kind of compatible high frequency electric ballast and low frequency input.
Background technology
Semiconductor lighting (LED) has the advantages such as light efficiency is high, life-span length, environmental protection, its gesture replacing traditional lighting (as incandescent lamp, fluorescent lamp) is inevitable, but still there is a large amount of conventional fluorescent illuminations now, the electric ballast that fluorescent lamp uses also occupies very large market, because conventional fluorescent lamp electronic ballast has output unsteadiness, it is all inconsistent when zero load, preheating, lighting, steady operation that it exports electrical quantity, and voltage difference can reach 2 ~ 5 times; When the input voltage change of electric ballast, it exports electrical quantity and also will change.
For the problems referred to above, market there is a kind of LED drive circuit of compatible high frequency electric ballast, by carrying out rectification after capacitance decompression, directly LED light source is connect after rectification, it does not do any safeguard measure after pressure reduction, through rectification Direct driver LED light source after step-down, although simply, but it is unstable and without any safeguard measure to export electrical quantity, poor reliability; In order to improve the reliability of LED drive circuit, market have also appeared the LED drive circuit of another compatible high frequency electric ballast, it adopts special integrated switching circuit to process after rectification, though stability is higher than directly accessing LED light source after rectification, but material cost is higher, raise the price of Related product to a certain extent, be unfavorable for the popularization of novel energy-conserving LED illumination.
The input of the LED drive circuit of compatible high frequency electric ballast changes with the exporting change of high-frequency electronic ballast, when high-frequency electronic ballast is in anomalous operating mode, the output of its instability is easy to LED drive circuit and LED lamp bead to damage, in order to improve resource utilization, market demand one carries overvoltage and overcurrent protection function, replaceability is strong, simple and practical, the transitional product that reliability is high and cost is low, this transitional product does not need to do any repacking to original light fixture, LED illumination can be made to directly apply in the high-frequency electronic ballast of former fluorescent lamp or the input of other low frequency.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art part and a kind of LED drive circuit carrying overvoltage and overcurrent protection function, reliability is high, cost is low compatible high frequency electric ballast and low frequency input is provided.
To achieve these goals, the invention provides the LED drive circuit of a kind of compatible high frequency electric ballast and low frequency input, comprise reduction voltage circuit, rectification circuit, protective circuit, filter circuit and load circuit, described reduction voltage circuit is connected with the input of rectification circuit, and the output of described rectification circuit, filter circuit and load circuit are connected in parallel successively, described protective circuit comprises sampling feedback circuit and one-way SCR, described sampling feedback circuit comprises dividing potential drop feedback circuit, voltage stabilizing didoe and the 3rd resistance, the negative pole of described voltage stabilizing didoe is connected with dividing potential drop feedback circuit, the positive pole of voltage stabilizing didoe is connected with the 3rd resistance, 3rd resistance is connected with the cathode output end of rectification circuit, described dividing potential drop feedback circuit is connected with rectification circuit and load circuit, anode and the negative electrode of described one-way SCR are connected cathode output end and the cathode output end of rectification circuit respectively, the control pole of described one-way SCR is connected with the positive pole of voltage stabilizing didoe, described dividing potential drop feedback circuit controls voltage stabilizing didoe conducting, described dividing potential drop feedback circuit and voltage stabilizing didoe control one-way SCR conducting.
As the preferred implementation of the LED drive circuit that compatible high frequency electric ballast of the present invention and low frequency input, described dividing potential drop feedback circuit comprises the first triode, the second triode, the 3rd triode, the 4th triode, the first resistance, the second resistance, the first divider resistance, the second divider resistance, the 3rd divider resistance, the first current-limiting resistance, the second current-limiting resistance, current sense resistor and voltage stabilizing didoe; The base stage of described first divider resistance, the second divider resistance, the 3rd divider resistance and the 3rd triode is sequentially connected in series, described first divider resistance is connected with the cathode output end of rectification circuit, and the emitter of described 3rd triode is connected with the cathode output end of rectification circuit; The collector electrode of described first resistance, the second resistance and the first triode is sequentially connected in series, one end of described first resistance is connected between the first divider resistance and the second divider resistance, the described emitter of the first triode is connected with the cathode output end of rectification circuit, the base stage of described first triode is connected with one end of the first current-limiting resistance, the other end of described first current-limiting resistance is connected between the first divider resistance and the second divider resistance, and the collector electrode of described 3rd triode is connected with the base stage of the first triode; The base stage of described second triode is connected between the first resistance and the second resistance, the emitter of the second triode is connected between the first divider resistance and the second divider resistance, and the collector electrode of the second triode is connected between the second divider resistance and the 3rd divider resistance; Described current sense resistor and load circuit are connected in series, described current sense resistor and the second current-limiting resistance are connected in series, described second current-limiting resistance is connected with the base stage of the 4th triode, the emitter of described 4th triode is connected with the cathode output end of rectification circuit, and the collector electrode of described 4th triode is connected with the base stage of the first triode; The negative pole of described voltage stabilizing didoe is connected between the first divider resistance and the second divider resistance.
As the preferred implementation of the LED drive circuit that compatible high frequency electric ballast of the present invention and low frequency input, also comprise the second electric capacity and the 3rd electric capacity, described second electric capacity is connected with the 3rd resistor coupled in parallel, one end of described 3rd electric capacity is connected between the base stage of the 3rd divider resistance and the 3rd triode, and the other end is connected with the cathode output end of rectification circuit.
As the preferred implementation of the LED drive circuit that compatible high frequency electric ballast of the present invention and low frequency input, also comprise the 4th electric capacity, the 5th electric capacity and the 6th electric capacity; One end of described 4th electric capacity is connected with the base stage of the 4th triode, and the other end is connected with the cathode output end of rectification circuit; One end of described 5th electric capacity is connected with the base stage of the first triode, and the other end is connected with the cathode output end of rectification circuit; One end of described 6th electric capacity is connected with the first divider resistance, and the other end is connected with the cathode output end of rectification circuit.
As the preferred implementation of the LED drive circuit that compatible high frequency electric ballast of the present invention and low frequency input, described first triode, the second triode, the 3rd triode and the 4th triode are compound transistor.
As the preferred implementation of the LED drive circuit that compatible high frequency electric ballast of the present invention and low frequency input, described filter circuit comprises electrochemical capacitor, the output of described electrochemical capacitor and rectification circuit is connected in parallel, and described load circuit and electrochemical capacitor are connected in parallel.
As the preferred implementation of the LED drive circuit that compatible high frequency electric ballast of the present invention and low frequency input, also comprise clamp diode, described clamp diode and electrochemical capacitor are connected in series, described clamp diode is connected with the cathode output end of rectification circuit, described electrochemical capacitor is connected with the cathode output end of rectification circuit, and described clamp diode is fast recovery diode or Ultrafast recovery diode.
As the preferred implementation of the LED drive circuit that compatible high frequency electric ballast of the present invention and low frequency input, described load circuit is LED switch circuit or LED lamp bead.
As the preferred implementation of the LED drive circuit that compatible high frequency electric ballast of the present invention and low frequency input, described reduction voltage circuit comprises the first electric capacity, the input of described first electric capacity and rectification circuit is connected in series, and described first Capacitance parallel connection is connected with the 4th resistance.
As the preferred implementation of the LED drive circuit that compatible high frequency electric ballast of the present invention and low frequency input, described rectification circuit is high-frequency rectification circuit, and described high-frequency rectification circuit is made up of four fast recovery diodes or four Ultrafast recovery diodes.
Implement embodiments of the invention, there is following beneficial effect:
LED drive circuit of the present invention may be used for high-frequency electronic ballast and the input of low frequency civil power of fluorescent lamp; and do not adopt any application-specific integrated circuit (ASIC); simple and practical sampling feedback circuit is adopted to detect input voltage and load current; also to LED drive circuit, protection is made by triggering one-way SCR Q1 to anomaly fast reaction; meet simple economy and dependability high double requirements, be more conducive to promote fluorescent lamp and develop to LED illumination.
Accompanying drawing explanation
Fig. 1 is the integrated circuit schematic diagram of LED drive circuit of the present invention;
Fig. 2 is the equivalent circuit diagram of LED drive circuit of the present invention when normally working and input voltage is too high;
Fig. 3 is the equivalent circuit diagram of LED drive circuit of the present invention when load current is too high.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail.
Shown in accompanying drawing 1 to accompanying drawing 3, the invention discloses the LED drive circuit of a kind of compatible high frequency electric ballast and low frequency input, comprise reduction voltage circuit 1, rectification circuit 2, protective circuit 3, filter circuit 4 and load circuit 5.
Described reduction voltage circuit 1 is connected with the input of rectification circuit 2, and the output of described rectification circuit 2, filter circuit 4 and load circuit 5 are connected in parallel successively; Described reduction voltage circuit comprises the first electric capacity C1, the input of described first electric capacity C1 and rectification circuit 2 is connected in series, first electric capacity C1 can be connected in parallel the 4th resistance (not marking in figure) of certain resistance, this resistance may be used for the electric discharge of the first electric capacity C1, first electric capacity C1 of the present invention can produce the capacitive reactance be inversely proportional to frequency and self capacity, utilize the LED drive circuit dividing potential drop of capacitive reactance and rear end, reach the object reducing rear end LED drive circuit input voltage, the first electric capacity C1 selects withstand voltage to be greater than the electric capacity of 1200V; Described rectification circuit 2 is high-frequency rectification circuit, described high-frequency rectification circuit is made up of four fast recovery diodes or four Ultrafast recovery diodes (VD1 to VD4 in accompanying drawing 1), or, high-frequency rectification circuit is the rectifier bridge stack be made up of fast recovery diode or Ultrafast recovery diode, the reverse recovery loss of diode can be reduced, high-frequency rectification circuit input voltage is unlikely to when trough from behind described electrochemical capacitor C2 is counter fills with, the cathode output end ground connection of described rectification circuit 2; Described filter circuit 4 comprises electrochemical capacitor C2, and the output of described electrochemical capacitor C2 and rectification circuit 2 is connected in parallel, and described load circuit 5 and electrochemical capacitor C2 are connected in parallel, and electrochemical capacitor C2 adopts the electric capacity of the low damage type of high frequency; In order to better protect load circuit 5 not damaged, the present invention also comprises clamp diode VD5, described clamp diode VD5 and electrochemical capacitor C2 is connected in series, described clamp diode VD5 is connected with the cathode output end of rectification circuit 2, described electrochemical capacitor C2 is connected with the cathode output end of rectification circuit 2, and described clamp diode VD5 is fast recovery diode or Ultrafast recovery diode; Load circuit of the present invention can be directly lamp pearl, the direct parallel lamp pearl of electrochemical capacitor C2, or can be also LED switch circuit, connects corresponding load circuit according to real needs.
Described protective circuit 3 comprises sampling feedback circuit and one-way SCR Q1, described sampling feedback circuit comprises dividing potential drop feedback circuit, voltage stabilizing didoe ZD1 and the 3rd resistance R3, the negative pole of described voltage stabilizing didoe ZD1 is connected with dividing potential drop feedback circuit, the positive pole of voltage stabilizing didoe ZD1 is connected with the 3rd resistance R3, 3rd resistance R3 is connected with the cathode output end of rectification circuit 2, described dividing potential drop feedback circuit is connected with rectification circuit 2 and load circuit 5, anode and the negative electrode of described one-way SCR Q1 are connected cathode output end and the cathode output end of rectification circuit respectively, the control pole of described one-way SCR Q1 is connected with the positive pole of voltage stabilizing didoe ZD1, described dividing potential drop feedback circuit controls the automatic conducting of voltage stabilizing didoe, described dividing potential drop feedback circuit and voltage stabilizing didoe ZD1 control one-way SCR conducting.
Dividing potential drop feedback circuit of the present invention comprises the first triode Q5, the second triode Q4, the 3rd triode Q3, the 4th triode Q2, the first resistance R4, the second resistance R5, the first divider resistance R1, the second divider resistance R6, the 3rd divider resistance R7, the first current-limiting resistance R2, the second current-limiting resistance R8, current sense resistor R9, is described in detail below to the connection of sampling feedback circuit (mainly based on dividing potential drop feedback circuit).
First branch road: the base stage of described first divider resistance R1, the second divider resistance R6, the 3rd divider resistance R7 and the 3rd triode Q3 is sequentially connected in series, described first divider resistance R1 is connected with the cathode output end of rectification circuit 2, and the emitter of described 3rd triode Q3 is connected with the cathode output end of rectification circuit 2.
Second branch road: described first resistance R4, the collector electrode of the second resistance R5 and the first triode Q5 is sequentially connected in series, one end of described first resistance R4 is connected between the first divider resistance R1 and the second divider resistance R6, the emitter of described first triode Q5 is connected with the cathode output end of rectification circuit 2, the base stage of described first triode Q5 is connected with one end of the first current-limiting resistance R2, the other end of described first current-limiting resistance R2 is connected between the first divider resistance R1 and the second divider resistance R6, the collector electrode of described 3rd triode Q3 is connected with the base stage of the first triode Q5.
3rd branch road: the base stage of described second triode Q4 is connected between the first resistance R4 and the second resistance R5, the emitter of the second triode Q4 is connected between the first divider resistance R1 and the second divider resistance R6, and the collector electrode of the second triode Q4 is connected between the second divider resistance R6 and the 3rd divider resistance R7.
4th branch road: described current sense resistor R9 and load circuit 5 are connected in series, described current sense resistor R9 and the second current-limiting resistance R8 is connected in series, described second current-limiting resistance R8 is connected with the base stage of the 4th triode Q2, the emitter of described 4th triode Q2 is connected with the cathode output end of rectification circuit 2, and the collector electrode of described 4th triode Q2 is connected with the base stage of the first triode Q5.
5th branch road: the negative pole of described voltage stabilizing didoe ZD1 is connected between the first divider resistance R1 and the second divider resistance R6, the positive pole of voltage stabilizing didoe ZD1 is connected with the 3rd resistance R3, described 3rd resistance R3 is connected with the cathode output end of rectification circuit 2, and the control pole of described one-way SCR Q1 is connected with the positive pole of voltage stabilizing didoe ZD1.
As booster action, protective circuit 3 also comprises following element:
The present invention also comprises the second electric capacity C3, the 3rd electric capacity C4, the 4th electric capacity C5, the 5th electric capacity C6 and the 6th electric capacity C7; Described second electric capacity C3 and the 3rd resistance R3 is connected in parallel; One end of described 3rd electric capacity C4 is connected between the base stage of the 3rd divider resistance R7 and the 3rd triode Q3, and the other end is connected with the cathode output end of rectification circuit 2; One end of described 4th electric capacity C5 is connected with the base stage of the 4th triode Q2, and the other end is connected with the cathode output end of rectification circuit 2; One end of described 5th electric capacity C6 is connected with the base stage of the first triode Q5, and the other end is connected with the cathode output end of rectification circuit 2; One end of described 6th electric capacity C7 is connected with the first divider resistance R1, and the other end is connected with the cathode output end of rectification circuit 2.
First triode Q5 of the present invention, the second triode Q4, the 3rd triode Q3 and the 4th triode Q2 can select NPN triode or be PNP triode, and triode of the present invention can be compound transistor.
Operation principle of the present invention is as follows:
After energising, high frequency voltage or low-frequency voltage signal are through the first electric capacity C1, high-frequency rectification circuit, obtain and rough direct voltage or DC pulse voltage, then after clamp diode VD5, carry out through electrochemical capacitor C2 the direct voltage supply load circuit being filtered into relative smooth; Concrete, the detection feedback principle of protective circuit 3 module is as follows, comprises too high and load overcurrent three parts of normal work, input voltage:
First: when circuit normally works, voltage after high-frequency rectification circuit rectification is through the first divider resistance R1, the first current-limiting resistance R2 base stage to the first triode Q5, for the base stage of the first triode Q5 provides bias current, another branch road, through the first divider resistance R1, the first resistance R4 and the second resistance R5 for the collector electrode of the first triode Q5 provides bias voltage, now, the first triode Q5 conducting; After first triode Q5 conducting, another branch voltage signal ground connection after the collector electrode of the emitter of the first divider resistance R1, the second triode Q4, the second resistance R5, the first triode Q5, for the base stage of the second triode Q4 provides bias current, voltage after rectification through the first divider resistance R1 for the second triode Q4 provides bias voltage, now, the second triode Q4 conducting; Voltage signal ground connection after the base stage of the collector electrode of the first divider resistance R1, the second triode Q4, the 3rd divider resistance R7, the 3rd triode Q3, the voltage at the 3rd electric capacity C4 two ends is approximately the dividing potential drop of connecting of the 3rd divider resistance R7 and the first divider resistance R1, and isoboles when circuit normally works as shown in Figure 2.
Second: when input voltage is too high; its circuit equivalent figure as shown in Figure 2; when input voltage is too high; the dividing potential drop at the 3rd divider resistance R7 two ends will be driven high; when the magnitude of voltage at the 3rd divider resistance R7 two ends reaches the voltage stabilizing value of voltage stabilizing didoe ZD1; voltage stabilizing didoe ZD1 conducting; voltage signal can provide a triggering signal by controllable silicon through the first divider resistance R1, voltage stabilizing didoe ZD1 and the 3rd resistance C3 to unidirectional; now; one-way SCR Q1 conducting; LED drive circuit enters guard mode, does not affect by input voltage is too high.
3rd: when load current is too high, electric current can through current sense resistor R9, the sampled voltage at current sense resistor R9 two ends can through the second current-limiting resistance R8, ground connection after the base stage of the 4th triode Q2, when load current exceedes set point, the sampled voltage at current sense resistor R9 two ends will raise, the base current flowing through the 4th triode Q2 will increase, after as the enough ambassadors of base current of the 4th triode Q2, it enters saturation condition, then the base current of the first triode Q5 will reduce, first triode Q5 is ended, after first triode Q5 ends, second triode Q4 is then without base bias current, second triode Q4 also will end, now, voltage between voltage stabilizing didoe ZD1 and ground is the second divider resistance R6, the dividing potential drop of the 3rd divider resistance R7 series connection and the first divider resistance R1, voltage stabilizing didoe ZD1 will be switched on along with voltage rise, further triggering one-way SCR Q1, LED drive circuit is made to enter guard mode, the not powered height that flows through affects, isoboles when electric current is too high as shown in Figure 3.
The present invention utilizes one-way SCR Q1 to be parallel to the output of rectification circuit 2, the trigger current of one-way SCR Q1 is controlled by voltage stabilizing didoe ZD1, the break-make of voltage stabilizing didoe ZD1 is controlled by the ratio of the first divider resistance R1 and the 3rd divider resistance R7, the first divider resistance R1 is controlled by the second triode Q4, the dividing ratios of the second divider resistance R6 and the 3rd divider resistance R7, the break-make of the second triode Q4 is controlled by the first triode Q5 and the 4th triode Q2, the break-make that load current controls the 4th triode Q2 is detected by current sense resistor R9, by this series of running, realize the protection that overvoltage and overcurrent etc. are abnormal, by controlling the first divider resistance R1, dividing potential drop relational implementation between second divider resistance R6 and the 3rd divider resistance R7: when normally working, voltage stabilizing didoe ZD1 does not trigger, during overvoltage protection, the dividing potential drop of the 3rd divider resistance R7 is enough to trigger voltage stabilizing didoe ZD1, during overcurrent protection, the dividing potential drop of the second divider resistance R6 and the 3rd divider resistance R7 is enough to trigger voltage stabilizing didoe ZD1.
LED drive circuit of the present invention makes its high-frequency electronic ballast that may be used for fluorescent lamp and the input of low frequency civil power by combination first electric capacity C1, rectification circuit 2, protective circuit, clamp diode and electrochemical capacitor; and do not adopt any application-specific integrated circuit (ASIC); simple and practical protective circuit is adopted to detect input voltage and load current; also to LED drive circuit, protection is made by triggering one-way SCR Q1 to anomaly fast reaction; meet simple economy and dependability high double requirements, be more conducive to promote fluorescent lamp and develop to LED illumination.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (10)
1. the LED drive circuit of a compatible high frequency electric ballast and low frequency input, it is characterized in that, comprise reduction voltage circuit, rectification circuit, protective circuit, filter circuit and load circuit, described reduction voltage circuit is connected with the input of rectification circuit, and the output of described rectification circuit, filter circuit and load circuit are connected in parallel successively;
Described protective circuit comprises sampling feedback circuit and one-way SCR, described sampling feedback circuit comprises dividing potential drop feedback circuit, voltage stabilizing didoe and the 3rd resistance, the negative pole of described voltage stabilizing didoe is connected with dividing potential drop feedback circuit, the positive pole of voltage stabilizing didoe is connected with the 3rd resistance, 3rd resistance is connected with the cathode output end of rectification circuit, described dividing potential drop feedback circuit is connected with rectification circuit and load circuit, anode and the negative electrode of described one-way SCR are connected cathode output end and the cathode output end of rectification circuit respectively, the control pole of described one-way SCR is connected with the positive pole of voltage stabilizing didoe, described dividing potential drop feedback circuit controls voltage stabilizing didoe conducting, described dividing potential drop feedback circuit and voltage stabilizing didoe control one-way SCR conducting.
2. the LED drive circuit of compatible high frequency electric ballast according to claim 1 and low frequency input, it is characterized in that, described dividing potential drop feedback circuit comprises the first triode, the second triode, the 3rd triode, the 4th triode, the first resistance, the second resistance, the first divider resistance, the second divider resistance, the 3rd divider resistance, the first current-limiting resistance, the second current-limiting resistance, current sense resistor;
The base stage of described first divider resistance, the second divider resistance, the 3rd divider resistance and the 3rd triode is sequentially connected in series, described first divider resistance is connected with the cathode output end of rectification circuit, and the emitter of described 3rd triode is connected with the cathode output end of rectification circuit;
The collector electrode of described first resistance, the second resistance and the first triode is sequentially connected in series, one end of described first resistance is connected between the first divider resistance and the second divider resistance, the described emitter of the first triode is connected with the cathode output end of rectification circuit, the base stage of described first triode is connected with one end of the first current-limiting resistance, the other end of described first current-limiting resistance is connected between the first divider resistance and the second divider resistance, and the collector electrode of described 3rd triode is connected with the base stage of the first triode;
The base stage of described second triode is connected between the first resistance and the second resistance, the emitter of the second triode is connected between the first divider resistance and the second divider resistance, and the collector electrode of the second triode is connected between the second divider resistance and the 3rd divider resistance;
Described current sense resistor and load circuit are connected in series, described current sense resistor and the second current-limiting resistance are connected in series, described second current-limiting resistance is connected with the base stage of the 4th triode, the emitter of described 4th triode is connected with the cathode output end of rectification circuit, and the collector electrode of described 4th triode is connected with the base stage of the first triode;
The negative pole of described voltage stabilizing didoe is connected between the first divider resistance and the second divider resistance.
3. the LED drive circuit of compatible high frequency electric ballast according to claim 2 and low frequency input, it is characterized in that, also comprise the second electric capacity and the 3rd electric capacity, described second electric capacity is connected with the 3rd resistor coupled in parallel, one end of described 3rd electric capacity is connected between the base stage of the 3rd divider resistance and the 3rd triode, and the other end is connected with the cathode output end of rectification circuit.
4. the LED drive circuit of compatible high frequency electric ballast according to claim 2 and low frequency input, is characterized in that, also comprise the 4th electric capacity, the 5th electric capacity and the 6th electric capacity;
One end of described 4th electric capacity is connected with the base stage of the 4th triode, and the other end is connected with the cathode output end of rectification circuit;
One end of described 5th electric capacity is connected with the base stage of the first triode, and the other end is connected with the cathode output end of rectification circuit;
One end of described 6th electric capacity is connected with the first divider resistance, and the other end is connected with the cathode output end of rectification circuit.
5. the LED drive circuit of compatible high frequency electric ballast according to claim 2 and low frequency input, it is characterized in that, described first triode, the second triode, the 3rd triode and the 4th triode are compound transistor.
6. the LED drive circuit of compatible high frequency electric ballast according to claim 1 and low frequency input, it is characterized in that, described filter circuit comprises electrochemical capacitor, and the output of described electrochemical capacitor and rectification circuit is connected in parallel, and described load circuit and electrochemical capacitor are connected in parallel.
7. the LED drive circuit of compatible high frequency electric ballast according to claim 6 and low frequency input, it is characterized in that, also comprise clamp diode, described clamp diode and electrochemical capacitor are connected in series, described clamp diode is connected with the cathode output end of rectification circuit, described electrochemical capacitor is connected with the cathode output end of rectification circuit, and described clamp diode is fast recovery diode or Ultrafast recovery diode.
8. the LED drive circuit of compatible high frequency electric ballast according to claim 1 and low frequency input, it is characterized in that, described load circuit is LED switch circuit or LED lamp bead.
9. the LED drive circuit of compatible high frequency electric ballast according to claim 1 and low frequency input, it is characterized in that, described reduction voltage circuit comprises the first electric capacity, and the input of described first electric capacity and rectification circuit is connected in series, and described first Capacitance parallel connection is connected with the 4th resistance.
10. the LED drive circuit of compatible high frequency electric ballast according to claim 1 and low frequency input, it is characterized in that, described rectification circuit is high-frequency rectification circuit, and described high-frequency rectification circuit is made up of four fast recovery diodes or four Ultrafast recovery diodes.
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| CN106413182A (en) * | 2016-08-31 | 2017-02-15 | 惠州市时宇虹光电科技有限公司 | Commercial power and ballast input compatible LED light source driving control device |
| CN107658843A (en) * | 2017-10-23 | 2018-02-02 | 江西美的贵雅照明有限公司 | Overvoltage crowbar and light fixture |
| CN107979886A (en) * | 2017-10-18 | 2018-05-01 | 惠州市时宇虹光电科技有限公司 | A kind of LED power switch dimming circuit of compatibility alternating current and ballast input |
| CN109212433A (en) * | 2018-10-18 | 2019-01-15 | 中国科学院电工研究所 | A kind of inverter IGBT fault pre-alarming and protection circuit |
| CN110383950A (en) * | 2017-03-08 | 2019-10-25 | 昕诺飞控股有限公司 | Electronic ballast interface circuit |
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| CN106413182A (en) * | 2016-08-31 | 2017-02-15 | 惠州市时宇虹光电科技有限公司 | Commercial power and ballast input compatible LED light source driving control device |
| CN106413182B (en) * | 2016-08-31 | 2021-06-08 | 惠州市时宇虹光电科技有限公司 | LED light source drive control device compatible with mains supply and ballast input |
| CN110383950A (en) * | 2017-03-08 | 2019-10-25 | 昕诺飞控股有限公司 | Electronic ballast interface circuit |
| CN110383950B (en) * | 2017-03-08 | 2022-06-17 | 昕诺飞控股有限公司 | Interface circuit of electronic ballast |
| CN107979886A (en) * | 2017-10-18 | 2018-05-01 | 惠州市时宇虹光电科技有限公司 | A kind of LED power switch dimming circuit of compatibility alternating current and ballast input |
| CN107979886B (en) * | 2017-10-18 | 2022-10-04 | 惠州市时宇虹光电科技有限公司 | LED power switch dimming circuit compatible with mains supply and ballast input |
| CN107658843A (en) * | 2017-10-23 | 2018-02-02 | 江西美的贵雅照明有限公司 | Overvoltage crowbar and light fixture |
| CN107658843B (en) * | 2017-10-23 | 2023-11-14 | 美智光电科技股份有限公司 | Overvoltage protection circuit and lamp |
| CN109212433A (en) * | 2018-10-18 | 2019-01-15 | 中国科学院电工研究所 | A kind of inverter IGBT fault pre-alarming and protection circuit |
| CN109212433B (en) * | 2018-10-18 | 2024-03-26 | 中国科学院电工研究所 | Inverter IGBT fault early warning and protection circuit |
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| CN104968106B (en) | 2017-08-11 |
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