CN206879154U - LED drive circuit of the AC input High Power Factor without stroboscopic - Google Patents
LED drive circuit of the AC input High Power Factor without stroboscopic Download PDFInfo
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- CN206879154U CN206879154U CN201720840348.0U CN201720840348U CN206879154U CN 206879154 U CN206879154 U CN 206879154U CN 201720840348 U CN201720840348 U CN 201720840348U CN 206879154 U CN206879154 U CN 206879154U
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Abstract
The utility model discloses a kind of LED drive circuit of the AC input High Power Factor without stroboscopic, it is related to LED drive circuit technical field.The LED drive circuit includes rectification circuit, the input termination electric main of rectification circuit, the output end of rectification circuit is connected with the input of the valley fill type capacitor filter, valley fill type capacitor filter is connected through voltage monitoring comparison circuit with the input of Switch Control and constant-current circuit, Switch Control and two groups of output ends of constant-current circuit connect with two groups of LED series windings respectively, when voltage monitoring comparison circuit exports low level, Switch Control and constant-current circuit control two groups of LED string series connection, when voltage monitoring comparison circuit exports high level, Switch Control and constant-current circuit control two groups of LED connection in series-parallel.The drive circuit have composition it is simple, by driving LED operation without stroboscopic and system power factor it is high the advantages of.
Description
Technical field
LED drive circuit technical field, more particularly to a kind of AC input High Power Factor be the utility model is related to without stroboscopic
LED drive circuit.
Background technology
LED light source is as a kind of novel green light source, because it has low power consumption, long lifespan, reaction speed fast, efficient
The advantages that energy-conservation, by more and more extensive application.Under same brightness, LED light source power consumption is only the ten of ordinary incandescent lamp
/ mono-, and the life-span can extend 100 times.But its life-span is largely determined by driving power, therefore a kind of reliable
, high conversion efficiency, long lifespan LED driving powers it is most important for LED light sources.
At present, the power supply mode of LED uses direct current more, and the civil power of power supply needs to be converted to direct current by rectifier bridge, then
LED lamp bead is driven to light by drive circuit.Its importation is typically made up of bridge rectifier and filter condenser, and the two is equal
Belong to non-linear element.Due to the presence of Large Copacity filter condenser so that the angle of flow of commutation diode becomes very narrow, only
It could be turned near the peak value of AC-input voltage, cause AC input current to produce serious distortion, be turned into spike.
Substantial amounts of harmonic component is contained in this current waveform, not only power network is polluted, also result in filtering after export it is active
Power significantly reduces, and power factor is greatly lowered.Although can improve power factor using Switching Power Supply, it is formed
More complicated, cost is higher.
Utility model content
Technical problem to be solved in the utility model is how to provide that a kind of to form simple and high power factor AC defeated
Enter LED drive circuit of the High Power Factor without stroboscopic.
In order to solve the above technical problems, technical solution adopted in the utility model is：A kind of AC input High Power Factor
LED drive circuit without stroboscopic, it is characterised in that：It is more electric including rectification circuit, valley fill type capacitor filter, voltage monitoring
Road and Switch Control and constant-current circuit, the input termination electric main of the rectification circuit, the output of the rectification circuit
End is connected with the input of the valley fill type capacitor filter, output end and the electricity of the valley fill type capacitor filter
The input connection of pressure monitoring comparison circuit, output end and the Switch Control and the perseverance of the voltage monitoring comparison circuit
Two groups of output ends of the input connection of current circuit, the Switch Control and constant-current circuit are contacted with two groups of LEDs respectively
Connect, every group of LED string includes more than one LED, and the Switch Control and constant-current circuit are used to be supervised according to the voltage
Survey two groups of LED string serial or parallel connections of Automatic level control of comparison circuit output.
Further technical scheme is：The drive circuit also includes protection circuit, the input of the protection circuit
Civil power is connect, the output of the protection circuit terminates the input of the rectification circuit, and it is the driving that the protection circuit, which is used for,
Circuit provides input protection.
Further technical scheme is：The protection circuit include piezo-resistance MOV1-MOV3, gas-discharge tube GDT,
Thermistor NTC and protective tube F1, live wire L are divided into three tunnels after the protective tube F1, and the first via is after piezo-resistance MOV1
It is connected with zero line N, the second tunnel is connected after piezo-resistance MOV2 and piezo-resistance MOV3 with zero line N successively, the 3rd tunnel and institute
State thermistor NTC one end connection, the other end of the thermistor NTC is an output end of the protection circuit, institute
State the gas-discharge tube GDT termination piezo-resistance MOV2 and piezo-resistance MOV3 node, the gas-discharge tube GDT
Other end ground connection, the piezo-resistance MOV1 and piezo-resistance MOV3 node for the protection circuit another output
End.
Preferably：The gas-discharge tube GDT uses B8G600L type gas-discharge tubes.
Preferably：The rectification circuit includes full-bridge type rectifier bridge DB1.
Further technical scheme is：The valley fill type capacitor filter includes diode D1-D3 and electric capacity C1-
C2, diode D1 negative pole are connected through the electric capacity C2 with the negative pole of the diode D2, the plus earth of the diode D2,
The positive pole of the diode D1 is grounded after electric capacity C1, and the positive pole of the diode D3 connects electric capacity C2 and diode D2 node,
The negative pole of the diode D3 connects the diode D1 and electric capacity C1 node, and the diode D1 and electric capacity C2 node is institute
The terminals of valley fill type capacitor filter are stated, are supervised for the cathode power supply output end and voltage respectively with the rectification circuit
Survey the power input connection of comparison circuit.
Further technical scheme is：The voltage monitoring comparison circuit includes resistance R2, potentiometer R3, resistance R4-
R6, diode D4, electric capacity C3 and operational amplifier U1, one end of the resistance R2 are grounded after potentiometer R3, resistance R2's
Negative pole of the other end with the diode D4 after the resistance R4 is connected, diode D4 plus earth, the electric capacity C3 with
The diode D4 is in parallel, and the resistance R5 termination resistance R4 and diode D4 node, the resistance R5 other end is divided into
Two-way, the first via are connected with the in-phase input end of the operational amplifier U1, and the second tunnel is grounded through resistance R6, operational amplifier U1
Anti-phase input terminate the resistance R2 and potentiometer R3 node, the power input of the operational amplifier U1 terminates the electricity
R4 and diode D4 node, the earth terminal ground connection of the operational amplifier U1 are hindered, the output end of the operational amplifier U1 is
The output end of the voltage monitoring comparison circuit.
Preferably：The operational amplifier U1 uses LM358 type operational amplifiers.
Further technical scheme is：The Switch Control and constant-current circuit include resistance R7-R14, electric capacity C4-
C5, diode D5, triode Q1-Q5 and linear constant current chip U2-U3, resistance R7 one end for the Switch Control and
The signal input part of constant-current circuit, the resistance R7 other end are connected with the base stage of the triode Q1, resistance R9 one end and institute
The power output end connection of valley fill type capacitor filter is stated, the resistance R9 other end is divided into two-way, the first via and triode Q2
Base stage connection, the second tunnel is connected with triode Q1 colelctor electrode, triode Q1 grounded emitter, the linear constant current chip
U2 1 pin is divided into two-way, and the first via is connected with the power output end of the valley fill type capacitor filter, and the second tunnel is through electric capacity C4
It is divided into three tunnels again afterwards, the first via is connected with 2 pin of the U2, and the second tunnel is connected after resistance R8 with 3 pin of the U2, the 3rd tunnel
Be connected with the second LED string LED2 positive pole, the second LED string LED2 negative pole respectively with the triode Q2 and triode
Q3 colelctor electrode connection, triode Q2 emitter stage are connected with diode D5 positive pole, diode D5 negative pole and the first LED
String LED1 positive pole connection, the first LED string LED1 negative pole are divided into two-way, the first via and the 1 of the linear constant current chip U3
Pin connect, the second tunnel after electric capacity C5 again be divided into three tunnels, the first via is connected with 2 pin of the U3, the second tunnel after resistance R14 and
The 3 pin connection of the U3, the 3rd tunnel ground connection, resistance R10 one end are connected with the output end of the voltage monitoring comparison circuit, electricity
The resistance R10 other end is connected with triode Q3 base stage, triode Q3 grounded emitter, resistance R13 one end and the electricity
The output end connection of pressure monitoring comparison circuit, the resistance R13 other end are connected with triode Q4 base stage, triode Q4 transmitting
Pole is grounded, and triode Q4 colelctor electrode is divided into two-way after resistance R12, and the first via connects the valley fill type electric capacity through resistance R11 and filtered
The power output end of wave circuit, the second tunnel are connected with the base stage of the triode Q5, and triode Q5 colelctor electrode connects two pole
Pipe D5 and the first LED string LED1 node, the power supply that triode Q5 emitter stage connects the valley fill type capacitor filter are defeated
Go out end.
Preferably：The linear constant current chip U2-U3 uses SM2082B Linear constant current chips.
It is using beneficial effect caused by above-mentioned technical proposal：LED is divided to two groups in the drive circuit, respectively linearly
Constant current, electric capacity is given to charge when realizing high voltage by valley fill type capacitor filter, electric capacity gives LED power supplies during low pressure, extends
Working time, while higher power factor is can guarantee that, and can be according to the connection in series-parallel of input voltage height automatic switchover LED groups
State, realize that Width funtion adapts to.
The drive circuit can realize more than 0.9 High Power Factor, and LED is without stroboscopic operation；Circuit operating efficiency is reachable
More than 85%, because circuit structure is simple, production efficiency ratio is higher using Switching Power Supply mode, and extends the service life of circuit,
It can be integrated in LED on same substrate, without external drive；Using triode as switching device, cost is than switch electricity
Source is much lower；It is wider to adapt to voltage range, be able to can be worked from 90 to 264V；By using protection circuit, therefore possess anti-
The function such as surge, anti-lightning strike, overvoltage protection, overheat protector, it is safe to use.
Brief description of the drawings
The utility model is described in further detail with reference to the accompanying drawings and detailed description.
Fig. 1 is the theory diagram of drive circuit described in the utility model embodiment；
Fig. 2 is the schematic diagram of protection circuit in drive circuit described in the utility model embodiment；
Fig. 3 is the schematic diagram of rectification circuit in drive circuit described in the utility model embodiment；
Fig. 4 is the schematic diagram of valley fill type capacitor filter in drive circuit described in the utility model embodiment；
Fig. 5 is the schematic diagram of voltage monitoring comparison circuit in drive circuit described in the utility model embodiment；
Fig. 6 is the schematic diagram of Switch Control and constant-current circuit in drive circuit described in the utility model embodiment；
Fig. 7 is the schematic diagram of drive circuit described in the utility model embodiment.
Embodiment
With reference to the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out clear
Chu, it is fully described by, it is clear that described embodiment is only part of the embodiment of the present utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belong to the scope of the utility model protection.
Many details are elaborated in the following description in order to fully understand the utility model, but this practicality is new
Type can also be different from other manner described here using other to be implemented, and those skilled in the art can be without prejudice to this reality
With doing similar popularization in the case of new intension, therefore the utility model is not limited by following public specific embodiment.
As shown in figure 1, the utility model embodiment discloses a kind of LED driving electricity of AC input High Power Factor without stroboscopic
Road, including rectification circuit, valley fill type capacitor filter, voltage monitoring comparison circuit and Switch Control and Constant Electric Current
Road.The input termination electric main of the rectification circuit, the output end of the rectification circuit and valley fill type capacitor filtering electricity
The input connection on road, the rectification circuit are used for the direct current that the electric main of input is converted into pulsation；The valley fill type
The output end of capacitor filter is connected with the input of the voltage monitoring comparison circuit, the valley fill type capacitor filter
For the low-voltage part raising of Rectified alternating current, half high pressure constant pressure of formation to be added into the periodic voltage of pulsation high pressure；The voltage
The output end of monitoring comparison circuit is connected with the input of the Switch Control and constant-current circuit, and the voltage monitoring compares
Circuit is used for the transient voltage for monitoring the valley fill type capacitor filter output, is higher than the threshold value of some setting in voltage
When, export low level, less than the setting threshold value when, export high level；The two of the Switch Control and constant-current circuit
Group output end connects with two groups of LEDs series winding respectively, and every group of LED string include more than one LED, in every group of LED string LED and
It is connected in series between LED, when voltage monitoring comparison circuit exports low level, Switch Control and constant-current circuit control two groups
LED string is connected, and when voltage monitoring comparison circuit exports high level, Switch Control and constant-current circuit control two groups of LED
Lamp string is in parallel.
Operation principle：First, the rectified circuit conversion of electric main is into Voltage pulsating direct-current supply, and Voltage pulsating direct-current supply is by filling out
The low-voltage part raising of Rectified alternating current, half high pressure constant pressure of formation are added the voltage shape of pulsation high pressure by paddy formula capacitor filter
State；Afterwards, the transient voltage of the valley fill type capacitor filter output is monitored by voltage monitoring comparison circuit, in voltage height
In some setting value（The rated voltage of about a little higher than LED strip connection work）When export low level, during less than this setting value
Export high level；Finally, Switch Control and constant-current circuit open LED when voltage monitoring comparison circuit exports low level
Tandem working path, parallel operation path is closed, make two groups of LED string series connection, high level is exported in voltage monitoring comparison circuit
When, LED strip connection active channel is closed, parallel operation path is opened, makes two groups of LED connection in series-parallel.
Preferably, in order to prevent the electric main of input from being caused damage to the drive circuit, the drive circuit also exists
The input of electric main adds protection circuit.Specifically, the input termination civil power of the protection circuit, the protection circuit
Output terminate the input of the rectification circuit, the protection circuit is used to provide to input for the drive circuit to protect.
Specifically, as shown in Fig. 2 the protection circuit includes piezo-resistance MOV1-MOV3, gas-discharge tube GDT, temperature-sensitive
Resistance NTC and protective tube F1.Live wire L is divided into three tunnels after the protective tube F1, and the first via is after piezo-resistance MOV1 with zero
Line N connections, the second tunnel are connected after piezo-resistance MOV2 and piezo-resistance MOV3 with zero line N successively, the 3rd tunnel and the heat
Quick resistance NTC one end connection, the other end of the thermistor NTC are an output end of the protection circuit, the gas
The body discharge tube GDT termination piezo-resistance MOV2 and piezo-resistance MOV3 node, the gas-discharge tube GDT's is another
One end is grounded, and the piezo-resistance MOV1 and piezo-resistance MOV3 node is another output end of the protection circuit.
Preferably, the gas-discharge tube GDT using B8G600L types gas-discharge tube, it is necessary to explanation, the gas
Discharge tube GDT concrete model can also be other models, and those skilled in the art can carry out appropriate according to actual conditions
Selection.
In the protection circuit, live wire L inputs connect 2A/250V protective tube F1, prevent in circuit occur short circuit or
The overcurrent protection of the abnormalities such as heavy-current discharge, avoid that fire occurs.Because capacitive circuit can be to electric capacity in startup moment
Have the large current charge process of a moment, in the protection circuit in incoming line series thermal-sensitive resistance NTC, thermistor
NTC has an inhibitory action to the high current of moment, avoids producing big rush of current to power network and drive circuit.In live wire
Piezo-resistance MOV1 in parallel between L and zero line N, same piezo-resistance MOV2 in parallel between live wire L and ground, zero line N and ground,
MOV3 and the gas-discharge tube GDT that connects, to the moment such as lightning surge high-energy to ground quick release, with protection circuit.
Because live wire L, the piezo-resistances of zero line N over the ground have small leakage current, the cumulative effect of leakage current multiple circuits work simultaneously when
Should cause power network earth leakage protective start breaking and influence work, gas-discharge tube GDT can completely cut off when circuit works live wire L,
The electric leakages of zero line N over the ground, prevent the earth leakage protective device mistake of power network from starting.
As shown in figure 3, the rectification circuit includes full-bridge type rectifier bridge DB1.It should be noted that the rectification circuit
Concrete form can also be other forms, and those skilled in the art can be of the prior art other whole according to use is actually needed
The concrete form of current circuit.After A and B in Fig. 2 are connected with the A in Fig. 3 and B respectively, by the protection circuit and rectification circuit
Connect together.
As shown in figure 4, the valley fill type capacitor filter includes diode D1-D3 and electric capacity C1-C2.Diode D1
Negative pole be connected through the electric capacity C2 with the negative pole of the diode D2, the plus earth of the diode D2, the diode
D1 positive pole is grounded after electric capacity C1, and the positive pole of the diode D3 connects electric capacity C2 and diode D2 node, the diode
D3 negative pole connects the diode D1 and electric capacity C1 node, and the diode D1 and electric capacity C2 node is valley fill type electricity
The terminals of capacitor filter circuit, for the cathode power supply output end and voltage monitoring comparison circuit with the rectification circuit respectively
Power input connection.The valley fill type capacitor filter causes the peak voltage that rectification circuit exports to bring up to peak value
The half of voltage, and power factor maintains higher index.
After C connections in C and Fig. 4 in Fig. 3, the rectification circuit and the valley fill type capacitor filter are connected to
Together.
As shown in figure 5, the voltage monitoring comparison circuit include resistance R2, potentiometer R3, resistance R4-R6, diode D4,
Electric capacity C3 and operational amplifier U1.One end of the resistance R2 is grounded after potentiometer R3, described in resistance R2 other end warp
Negative pole after resistance R4 with the diode D4 is connected, diode D4 plus earth, the electric capacity C3 and diode D4
Parallel connection, the resistance R5 termination resistance R4 and diode D4 node, the resistance R5 other end are divided into two-way, the first via with
The in-phase input end connection of the operational amplifier U1, the second tunnel are grounded through resistance R6, operational amplifier U1 inverting input
The resistance R2 and potentiometer R3 node are connect, the power input of the operational amplifier U1 terminates the resistance R4 and diode
D4 node, the earth terminal ground connection of the operational amplifier U1, the output end of the operational amplifier U1 is the voltage monitoring
The output end of comparison circuit.
Preferably, the operational amplifier U1 uses LM358 type operational amplifiers.It should be noted that the computing is put
Big device U1 concrete model can also be other models, and those skilled in the art can use in the prior art according to being actually needed
Other models realize the function of the operational amplifier U1.
Voltage comparator circuit is formed by resistance R2-R6, diode D4 and operational amplifier U1, with the change of operating voltage
In the operational amplifier U1 pin of output end 1（That is F points）Export low and high level signal.13V height is exported when operating voltage is low
Level, exports 0V low level when operating voltage is high, adjustment potentiometer R3 resistance can change working standard voltage.
It is after D connections in D and Fig. 5 in Fig. 4 that the valley fill type capacitor filter and the voltage monitoring is more electric
Road connects together.
As shown in fig. 6, the Switch Control and constant-current circuit include resistance R7-R14, electric capacity C4-C5, diode
D5, triode Q1-Q5 and linear constant current chip U2-U3.Resistance R7 one end is the Switch Control and constant-current circuit
A signal input part（F1 in Fig. 6）, the output end of the signal input part and the voltage monitoring comparison circuit（In Fig. 5
F）Connection, the resistance R7 other end are connected with the base stage of the triode Q1；Resistance R9 one end and the valley fill type electric capacity
The power output end connection of filter circuit, the resistance R9 other end are divided into two-way, and the first via is connected with triode Q2 base stage, the
Two tunnels are connected with triode Q1 colelctor electrode, triode Q1 grounded emitter；1 pin of the linear constant current chip U2 is divided into two
Road, the first via are connected with the power output end of the valley fill type capacitor filter, and the second tunnel is divided into three tunnels again after electric capacity C4,
The first via is connected with 2 pin of the U2, and the second tunnel is connected after resistance R8 with 3 pin of the U2, the 3rd tunnel and the second LED string
LED2 positive pole connection, the second LED string LED2 negative pole connect with the triode Q2 and triode Q3 colelctor electrode respectively
Connect.
Triode Q2 emitter stage is connected with diode D5 positive pole, diode D5 negative pole and the first LED string LED1
Positive pole connection, the first LED string LED1 negative pole is divided into two-way, and the first via is connected with 1 pin of the linear constant current chip U3,
Second tunnel after electric capacity C5 again be divided into three tunnels, the first via is connected with 2 pin of the U3, the second tunnel after resistance R14 with the U3
3 pin connection, the 3rd tunnel ground connection.Resistance R10 one end（F2 in Fig. 6）With the output end of the voltage monitoring comparison circuit
（F in Fig. 5）Connection, the resistance R10 other end are connected with triode Q3 base stage, triode Q3 grounded emitter.Resistance
R13 one end（F3 in Fig. 6）With the output end of the voltage monitoring comparison circuit（F in Fig. 5）Connection, resistance R13's is another
One end is connected with triode Q4 base stage, triode Q4 grounded emitter, and triode Q4 colelctor electrode is divided into after resistance R12
Two-way, the first via meet the power output end of the valley fill type capacitor filter, the second tunnel and the triode Q5 through resistance R11
Base stage connection, triode Q5 colelctor electrode connects the diode D5 and the first LED string LED1 node, triode Q5 hair
Emitter-base bandgap grading connects the power output end of the valley fill type capacitor filter.
Preferably, the linear constant current chip U2-U3 uses SM2082B Linear constant current chips.It should be noted that institute
The concrete model for stating linear constant current chip U2-U3 can also be other models, and those skilled in the art can be according to being actually needed
The function of the linear constant current chip U2-U3 is realized using other models of the prior art.
E connections in E and Fig. 6 in Fig. 5, the F in Fig. 5 is connected with the F1-F3 in Fig. 6 respectively, by the voltage monitoring
Comparison circuit connects together with the Switch Control and constant-current circuit.
LED light source is two groups, and when operating voltage is relatively low, LED1, LED2 work for parallel connection, when operating voltage is higher
When LED1, LED2 be series connection work, the control signal that the switching of working method is exported by voltage monitoring comparison circuit carrys out reality
It is existing.Two-period form LED drivings are the improvement and optimization to traditional single hop LED linear constant-current circuit, can be realized under high voltages
Working condition as single hop LED linear constant-current circuit, and can not avoid single hop LED linear constant-current circuit at the lower voltage not
The drawbacks of energy normal work.Its operation principle is as follows：
As shown in fig. 6, when operating voltage is less than setting value, voltage monitoring comparison circuit output high level（The present embodiment
Middle high level could be arranged to 13V）, i.e. F points are high level, and triode Q1 is turned on, and triode Q2 cut-offs, triode Q4-Q5 is led
It is logical, forward voltage is loaded to LED1 by triode Q5 and forms active channel；Triode Q3 conductings simultaneously, pass through triode Q3
LED2 negative poles and circuit negative pole are connected to form active channel.Now LED1 and LED2 is lighted simultaneously, in parallel operation mode.
When operating voltage is higher than setting value, voltage monitoring comparison circuit output low level（Level is 0）, i.e. F points are low
Level, triode Q3-Q5 are in cut-off state, and then triode Q2 is turned on for triode Q1 cut-offs, electric current by constant current chip U2 →
LED2 → triode Q2 → diode D5 → LED1 → constant current chip U1 → ground, performance loop is formed, now LED1 and LED2 is same
When light, in tandem working mode.
Fig. 7 is the overall schematic diagram of drive circuit described in the utility model embodiment, and the F in Fig. 7 connects with F2 and F3 respectively
Connect.
LED is divided to two groups in the drive circuit, and linear constant current, high voltage is realized by valley fill type capacitor filter respectively
When give electric capacity charging, electric capacity gives LED power supplies during low pressure, extends the working time, while can guarantee that higher power factor, and energy
Enough connection in series-parallel states according to input voltage height automatic switchover LED groups, realize that Width funtion adapts to.
The drive circuit can realize more than 0.9 High Power Factor, and LED is without stroboscopic operation；Circuit operating efficiency is reachable
More than 85%, because circuit structure is simple, production efficiency ratio is higher using Switching Power Supply mode, and extends the service life of circuit,
It can be integrated in LED on same substrate, without external drive；Using triode as switching device, cost is than switch electricity
Source is much lower；It is wider to adapt to voltage range, be able to can be worked from 90 to 264V；By using protection circuit, therefore possess anti-
The function such as surge, anti-lightning strike, overvoltage protection, overheat protector, it is safe to use.
Claims (10)
- A kind of 1. LED drive circuit of the AC input High Power Factor without stroboscopic, it is characterised in that：Including rectification circuit, valley fill type Capacitor filter, voltage monitoring comparison circuit and Switch Control and constant-current circuit, the input termination of the rectification circuit Electric main, the output end of the rectification circuit are connected with the input of the valley fill type capacitor filter, the valley fill type The output end of capacitor filter is connected with the input of the voltage monitoring comparison circuit, the voltage monitoring comparison circuit Output end is connected with the input of the Switch Control and constant-current circuit, and the two of the Switch Control and constant-current circuit Group output end connects with two groups of LEDs series winding respectively, and every group of LED string includes more than one LED, the Switch Control and Constant-current circuit is used for the two groups of LED string serial or parallel connections of Automatic level control exported according to the voltage monitoring comparison circuit.
- 2. LED drive circuit of the AC input High Power Factor without stroboscopic as claimed in claim 1, it is characterised in that：The drive Dynamic circuit also includes protection circuit, and the input of the protection circuit terminates civil power, and the output termination of the protection circuit is described whole The input of current circuit, the protection circuit are used to provide input protection for the drive circuit.
- 3. LED drive circuit of the AC input High Power Factor without stroboscopic as claimed in claim 2, it is characterised in that：The guarantor Protection circuit includes piezo-resistance MOV1-MOV3, gas-discharge tube GDT, thermistor NTC and protective tube F1, described in live wire L warps It is divided into three tunnels after protective tube F1, the first via is connected after piezo-resistance MOV1 with zero line N, and the second tunnel is successively through piezo-resistance MOV2 And be connected after piezo-resistance MOV3 with zero line N, the 3rd tunnel is connected with one end of the thermistor NTC, the thermistor The NTC other end is an output end of the protection circuit, and the one of the gas-discharge tube GDT terminates the piezo-resistance MOV2 and piezo-resistance MOV3 node, the other end ground connection of the gas-discharge tube GDT, the piezo-resistance MOV1 with it is pressure-sensitive Resistance MOV3 node is another output end of the protection circuit.
- 4. LED drive circuit of the AC input High Power Factor without stroboscopic as claimed in claim 3, it is characterised in that：The gas Body discharge tube GDT uses B8G600L type gas-discharge tubes.
- 5. LED drive circuit of the AC input High Power Factor without stroboscopic as claimed in claim 1 or 2, it is characterised in that：It is described Rectification circuit includes full-bridge type rectifier bridge DB1.
- 6. LED drive circuit of the AC input High Power Factor without stroboscopic as claimed in claim 1 or 2, it is characterised in that：It is described Valley fill type capacitor filter includes diode D1-D3 and electric capacity C1-C2, and diode D1 negative pole is through the electric capacity C2 and institute Diode D2 negative pole connection is stated, the plus earth of the diode D2, the positive pole of the diode D1 is grounded after electric capacity C1, The positive pole of the diode D3 connects electric capacity C2 and diode D2 node, the negative pole of the diode D3 connect the diode D1 with Electric capacity C1 node, the diode D1 and electric capacity C2 node are the terminals of the valley fill type capacitor filter, are used for It is connected respectively with the cathode power supply output end of the rectification circuit and the power input of voltage monitoring comparison circuit.
- 7. LED drive circuit of the AC input High Power Factor without stroboscopic as claimed in claim 1 or 2, it is characterised in that：It is described Voltage monitoring comparison circuit includes resistance R2, potentiometer R3, resistance R4-R6, diode D4, electric capacity C3 and operational amplifier U1, one end of the resistance R2 are grounded after potentiometer R3, the resistance R2 other end after the resistance R4 with the diode D4 negative pole connection, diode D4 plus earth, the electric capacity C3 is in parallel with the diode D4, a resistance R5 termination institute Resistance R4 and diode D4 node are stated, the resistance R5 other end is divided into two-way, and the first via is same with the operational amplifier U1's Phase input is connected, and the second tunnel is grounded through resistance R6, and operational amplifier U1 anti-phase input terminates the resistance R2 and potentiometer R3 node, the power input of the operational amplifier U1 terminate the resistance R4 and diode D4 node, and the computing is put Big device U1 earth terminal ground connection, the output end of the operational amplifier U1 are the output end of the voltage monitoring comparison circuit.
- 8. LED drive circuit of the AC input High Power Factor without stroboscopic as claimed in claim 7, it is characterised in that：The fortune Calculate amplifier U1 and use LM358 type operational amplifiers.
- 9. LED drive circuit of the AC input High Power Factor without stroboscopic as claimed in claim 1 or 2, it is characterised in that：It is described Switch Control and constant-current circuit include resistance R7-R14, electric capacity C4-C5, diode D5, triode Q1-Q5 and linear perseverance Chip U2-U3 is flowed, resistance R7 one end is the Switch Control and the signal input part of constant-current circuit, and resistance R7's is another End is connected with the base stage of the triode Q1, and resistance R9 one end and the power output end of the valley fill type capacitor filter connect Connect, the resistance R9 other end is divided into two-way, and the first via is connected with triode Q2 base stage, the second tunnel and triode Q1 colelctor electrode Connection, triode Q1 grounded emitter, 1 pin of the linear constant current chip U2 are divided into two-way, the first via and the valley fill type The power output end connection of capacitor filter, the second tunnel are divided into three tunnels again after electric capacity C4, and the first via and 2 pin of the U2 connect Connecing, the second tunnel is connected after resistance R8 with 3 pin of the U2, and the 3rd tunnel is connected with the second LED string LED2 positive pole, and second Colelctor electrode of the LED string LED2 negative pole respectively with the triode Q2 and triode Q3 is connected, triode Q2 emitter stage It is connected with diode D5 positive pole, diode D5 negative pole is connected with the first LED string LED1 positive pole, the first LED string LED1 negative pole is divided into two-way, and the first via is connected with 1 pin of the linear constant current chip U3, and the second tunnel is divided into again after electric capacity C5 Three tunnels, the first via are connected with 2 pin of the U3, and the second tunnel is connected after resistance R14 with 3 pin of the U3, the 3rd tunnel ground connection, electricity Resistance R10 one end is connected with the output end of the voltage monitoring comparison circuit, the resistance R10 other end and triode Q3 base stage Connection, triode Q3 grounded emitter, resistance R13 one end are connected with the output end of the voltage monitoring comparison circuit, electricity The resistance R13 other end is connected with triode Q4 base stage, and triode Q4 grounded emitter, triode Q4 colelctor electrode is through resistance It is divided into two-way after R12, the first via meets the power output end of the valley fill type capacitor filter, the second tunnel and institute through resistance R11 Triode Q5 base stage connection is stated, triode Q5 colelctor electrode connects the diode D5 and the first LED string LED1 node, and three Pole pipe Q5 emitter stage connects the power output end of the valley fill type capacitor filter.
- 10. LED drive circuit of the AC input High Power Factor without stroboscopic as claimed in claim 9, it is characterised in that：The line Property constant current chip U2-U3 uses SM2082B Linear constant current chips.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720840348.0U CN206879154U (en) | 2017-07-12 | 2017-07-12 | LED drive circuit of the AC input High Power Factor without stroboscopic |
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| CN201720840348.0U CN206879154U (en) | 2017-07-12 | 2017-07-12 | LED drive circuit of the AC input High Power Factor without stroboscopic |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110797853A (en) * | 2019-11-21 | 2020-02-14 | 东莞市鹏为科技有限公司 | Lightning protection circuit and lightning protection street lamp |
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2017
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110797853A (en) * | 2019-11-21 | 2020-02-14 | 东莞市鹏为科技有限公司 | Lightning protection circuit and lightning protection street lamp |
| CN110797853B (en) * | 2019-11-21 | 2021-12-07 | 东莞市鹏为科技有限公司 | Lightning protection circuit and lightning protection street lamp |
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Effective date of registration: 20190515 Address after: Room 310, Office Building 8 Xingyuan North Road, Luquan District, Shijiazhuang City, Hebei Province, 050200 Patentee after: Hebei Panmao Technology Co., Ltd. Address before: 050000 Unit 601, Building 4, Unit 3, 253 Yuhua West Road, Qiaoxi District, Shijiazhuang City, Hebei Province Patentee before: Gu Peigeng |
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