CN208581381U - A kind of LED drive circuit and LED lamp of compatible electronic ballast and alternating current - Google Patents
A kind of LED drive circuit and LED lamp of compatible electronic ballast and alternating current Download PDFInfo
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- CN208581381U CN208581381U CN201821255533.4U CN201821255533U CN208581381U CN 208581381 U CN208581381 U CN 208581381U CN 201821255533 U CN201821255533 U CN 201821255533U CN 208581381 U CN208581381 U CN 208581381U
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Abstract
The utility model relates to the LED drive circuits and LED lamp of a kind of compatible electronic ballast and alternating current, comprising: for receiving the first input end of alternating current, the second input terminal, the reduction voltage circuit connecting with first input end and the second input terminal, the rectification circuit connecting with reduction voltage circuit, the leakage current limiting circuit being connected with the rectifying circuit, the constant current output circuit connecting with leakage current limiting circuit, the respectively signal sample circuit that connect with the second input terminal and leakage current limiting circuit and the switch connecting with leakage current limiting circuit.The utility model can simultaneously compatible electronic ballast and alternating current, can be reduced automatically when connecing electric ballast electric ballast output high frequency voltage, effective protection late-class circuit；When connecing alternating current, single-termination electricity can be met and both-end connects electricity, and both-end connects electricity can pass through leakage current testing.
Description
Technical field
The utility model relates to LED technology field, more specifically to a kind of compatible electronic ballast and alternating current
LED drive circuit and LED lamp.
Background technique
In recent years, under big form and the environment for advocating energy-saving and emission-reduction comprehensively, to the continuous of energy-saving control dynamics
It increases, the attention degree of environmental protection is increasingly paid attention to, people's environmental consciousness is also continuously improved, and LED light source is new generation of semiconductor
Light source has the characteristics that efficient, the service life is long compared with existing light source.LED belongs to environmentally protective light source, the harmful substances such as mercury-free, lead,
It is grown rapidly using LED as the illuminating product of light source, substitution traditional lighting has become trend.
LED lamp tube is divided into substantially with Types Below on the market at present:
(1) only meet the fluorescent tube of Type A (electric ballast) type；
(2) only meet the fluorescent tube of Type B (alternating current) type, but can only single-termination electricity, both-end connects electricity can not be by leakage electricity
Current test；
(3) meet the fluorescent tube of Type A+Type B (single-termination electricity) type, but as Type B in use, can only be single-ended
Electricity is connect, both-end connects electricity can not be by the leakage current testing of UL Valuation Standard.
Utility model content
The technical problem to be solved by the present invention is in view of the above drawbacks of the prior art, provide a kind of compatible electricity
The LED drive circuit and LED lamp of sub-ballast and alternating current.
The technical scheme adopted by the utility model to solve the technical problem is as follows: constructing a kind of compatible electronic ballast and city
The LED drive circuit of electricity, comprising:
First input end, the second input terminal and the first input end and described second for receiving alternating current input
The reduction voltage circuit for holding connection, the rectification circuit being connect with the reduction voltage circuit, the leakage current being connect with rectification circuit limit
Circuit processed, the constant current output circuit being connect with the leakage current limiting circuit, respectively with second input terminal and described let out
The signal sample circuit of drain current limit circuit connection and the switch being connect with the leakage current limiting circuit；
When the alternating current is the high-frequency alternating current of electric ballast output, the reduction voltage circuit is to the high-frequency ac
Electricity is depressured, and output buck signal；The rectification circuit is used for the AC rectification of the buck signal or low frequency
For direct current；The signal sample circuit detects the alternating current of second input terminal, and in the exchange of second input terminal
Electricity bypasses the leakage current limiting circuit when being high-frequency alternating current；
When the alternating current is low frequency ac, the leakage current limiting circuit is for detecting LED drive circuit
Loop voltage, and control the switch when the loop voltage of LED drive circuit reaches threshold value and disconnect, make the constant current output electricity
Road and the rectification circuit disconnect.
Preferably, the first input end includes the first pin and the second pin；
The LED drive circuit of the compatible electronic ballast and alternating current further includes being connected on first pin and the drop
The first current foldback circuit between volt circuit, the third overcurrent being connected between second pin and the reduction voltage circuit are protected
Protection circuit and the second current foldback circuit being connected between second input terminal and the reduction voltage circuit.
Preferably, the reduction voltage circuit includes first capacitor and the second capacitor；
The first end of the first capacitor is connect with first current foldback circuit, the second end of the first capacitor and
The first end of second capacitor connects second current foldback circuit together, the second end of second capacitor and described the
The connection of three current foldback circuits.
Preferably, the leakage current limiting circuit includes: current-limiting circuit and control circuit；
The input terminal of the current-limiting circuit is connect with the output end of the rectification circuit, the output end of the current-limiting circuit with
The feeder ear of the control circuit connects.
Preferably, the current-limiting circuit includes diode D3, resistance R5, resistance R6 and resistance R9；
The anode of the diode D3 connects the output end of the rectification circuit, described in the cathode connection of the diode D3
The first end of resistance R5, the second end of the resistance R5 connect the first end of the resistance R6, and the second end of the resistance R6 connects
The first end of the resistance R9 is connect, the second end of the resistance R9 connects the feeder ear of the control circuit.
Preferably, the control circuit includes control chip U1, capacitor C5, capacitor C7, resistance R7, resistance R8, capacitor C6；
The switch includes metal-oxide-semiconductor Q, and the metal-oxide-semiconductor Q is built in the control chip U1；
The control chip U1 includes power supply circuit, logic control circuit and driving circuit, the input of the power supply circuit
The 8th pin of the end connection control chip U1, the output end of the power supply circuit connects the logic control circuit, described
Logic control circuit connects the input terminal of the driving circuit, and the output end of the driving circuit connects the grid of the metal-oxide-semiconductor Q
Pole, the metal-oxide-semiconductor Q drain electrode connection it is described control chip U1 third pin and the 4th pin, the source electrode of the metal-oxide-semiconductor Q and
The logic control circuit connects the 5th pin of the control chip U1 together；
The 8th pin of the control chip U1 connects the second of the resistance R9 as the feeder ear of the control circuit
8th pin at end, the control chip U1 also passes through the first power ground of the capacitor C5 connection；
The second pin of the control chip U1 connects the first power ground, and the 6th pin of the control chip U1 passes through institute
State capacitor C6 the first power ground of connection, the 5th pin of the control chip U1 by the first power ground of the resistance R8 connection,
The both ends of the resistance R8 are connected in parallel on after the capacitor C7 is in parallel with the resistance R7 again；The third pin of the control chip U1
It is shorted with the 4th pin and with connecting second source.
Preferably, the signal sample circuit includes: filter rectifier and metal-oxide-semiconductor Q1；
The input terminal of the filter rectifier is connect with second input terminal, the output end of the filter rectifier
It is connect with the grid of the metal-oxide-semiconductor Q1, the source electrode of the metal-oxide-semiconductor Q1 connects the first power ground, the drain electrode connection of the metal-oxide-semiconductor Q1
The leakage current limiting circuit.
Preferably, the filter rectifier include: inductance L2, capacitor C9, diode D9, diode D10, capacitor C10,
Resistance R16, voltage-stabiliser tube D11；
The first end of the inductance L2 connects second input terminal, and the second end of the inductance L2 connects the capacitor C9
First end, the second end of the capacitor C9 is separately connected the anode of the diode D9 and the cathode of the diode D10；Institute
The cathode for stating diode D9 connects the grid of the metal-oxide-semiconductor Q1, and the cathode of the diode D9 also passes through the capacitor C10 connection
First power ground；The cathode of the diode D10 connects the first power ground, and the resistance R9 is connected in parallel on the two of the capacitor C10
End, the cathode of the voltage-stabiliser tube D11 connect the grid of the metal-oxide-semiconductor Q1, and the anode of the voltage-stabiliser tube D11 connects the first power supply
Ground.
Preferably, the signal sample circuit further include: be connected to the leakage current limiting circuit and the metal-oxide-semiconductor Q1
Drain electrode between anti-circnit NOT；
The anti-circnit NOT includes diode D12 and diode D13；
The anode of the diode D12 connects the leakage current limiting circuit, and the cathode of the diode D12 connects institute
The drain electrode of metal-oxide-semiconductor Q1 is stated, the diode D13 is in parallel with the diode D12.
The utility model also provides a kind of LED lamp, drives including the LED of above-described compatible electronic ballast and alternating current
Dynamic circuit.
Implement the compatible electronic ballast of the utility model and the LED drive circuit of alternating current, has the advantages that this
Utility model can simultaneously compatible electronic ballast and alternating current, can be reduced automatically when connecing electric ballast electric ballast output
High frequency voltage, effective protection late-class circuit；When connecing alternating current, can meet single-termination electricity and both-end connects electricity, and both-end connect electricity can
To pass through leakage current testing.
In addition, the LED lamp of the utility model can be in use, can be directly with this reality in the electric ballast of fluorescent lamp
Original fluorescent lamp is replaced with novel LED light, is saved labour turnover；In the electric ballast end-of-life of fluorescent lamp, also only
Electronic ballast for fluoresent lamp need to be removed, the LED light of the utility model can be continued to use by carrying out simple refit to circuit, save purchase
Set fluorescent tube cost.Simultaneously because there is leakage current to protect circuit, when LED light one end of the utility model is charged, human body is touched at this time
The danger of electric shock is not had when touching the fluorescent tube other end, security performance is high.
Detailed description of the invention
Below in conjunction with accompanying drawings and embodiments, the utility model is described in further detail, in attached drawing:
Fig. 1 is the functional block diagram of the LED drive circuit of the utility model compatible electronic ballast and alternating current；
Fig. 2 is the circuit diagram of the LED drive circuit of the utility model compatible electronic ballast and alternating current；
Fig. 3 is the functional block diagram that switch is built in control chip U1.
Specific embodiment
For a clearer understanding of the technical features, objectives and effects of the utility model, now control attached drawing is detailed
Illustrate specific embodiment of the present utility model.
It is the functional block diagram of the LED drive circuit of the utility model compatible electronic ballast and alternating current with reference to Fig. 1, Fig. 1.Such as
Shown in Fig. 1, the compatible electronic ballast of the utility model embodiment and the LED drive circuit of alternating current include for input AC electricity
First input end 10, the second input terminal 20, the reduction voltage circuit 30 being connect with first input end 10 and the second input terminal 20, with drop
The rectification circuit 40 of the connection of volt circuit 30, the leakage current limiting circuit 50 connecting with rectification circuit 40 are limited with leakage current
The constant current output circuit 70 of the connection of circuit 50, the signal connecting respectively with the second input terminal 20 and leakage current limiting circuit 50 are adopted
Sample circuit 60 and the switch 80 being connect with leakage current limiting circuit 50.
Specifically, the alternating current that first input end 10 and the second input terminal 20 are inputted includes the height of electric ballast output
Frequency alternating current and low frequency ac.Wherein, when the external power supply connect is alternating current, the alternating current inputted is 50/60Hz's
Low frequency ac；When the external power supply connect is that (practical is that alternating current just inputs first after electric ballast to electric ballast
Input terminal 10 and the second input terminal 20) when, the alternating current inputted is high-frequency alternating current.Generally, electric ballast exports
High-frequency alternating current is 60~80KHz, 600~800V range.
In the utility model embodiment, reduction voltage circuit 30 mainly generates work when the alternating current inputted is high-frequency alternating current
With.That is it when the alternating current inputted is high-frequency alternating current (i.e. external power supply is alternating current, and need to first pass through electric ballast), drops
Volt circuit 30 is depressured high-frequency alternating current, and output buck signal.By in first input end 10 and the second input terminal 20
Between the reduction voltage circuit 30 is set, can the alternating current of access be high-frequency alternating current when, be effectively reduced electric ballast output
High-frequency ac voltage, the influence for avoiding high-frequency ac voltage from generating late-class circuit, effective protection late-class circuit.And due to
The reduction voltage circuit 30 is set, can make substituting traditional fluorescent lamp using the LED lamp tube of the LED drive circuit of the utility model
Guan Shi can be directly compatible with electric ballast.For example, can directly be adopted when the electric ballast of fluorescent lamp can also use
Original fluorescent lamp is substituted with the LED lamp tube of the LED drive circuit of the utility model, is saved labour turnover, meanwhile, use LED light
Pipe substitutes fluorescent tube, may also reach up effective energy-efficient purpose.In addition, the electric ballast service life in original fluorescent tube ties
Shu Shi also need to only remove the electric ballast of fluorescent tube, carry out simple refit to circuit, can continue to use the utility model
LED drive circuit LED lamp tube, the cost for purchasing fluorescent tube is greatly saved.
Further, the reduction voltage circuit 30 of the utility model embodiment, should when the alternating current of input is low frequency ac
Reduction voltage circuit 30 does not generate effect, does not have an impact to low frequency ac, and the low frequency ac inputted flows directly into rear class electricity
Road.
Optionally, the reduction voltage circuit 30 of the utility model embodiment can be realized by capacitor.Wherein, selected capacitor
For resistance to voltage capacitance, for example, capacitance can be used for the resistance to voltage capacitance of 1~4.7nF.
In the utility model embodiment, rectification circuit 40 is used to the AC rectification of buck signal or low frequency be direct current
Electricity.Specifically, (i.e. external power supply is alternating current, does not connect electric ballast), institute when the alternating current inputted is low frequency ac
The low frequency ac of input flows directly into rectification circuit 40, carries out rectification processing to the low frequency ac by rectification circuit 40, and
Corresponding direct current is rectified into be supplied to late-class circuit.When the alternating current inputted is high-frequency alternating current (by electronic ballast
Device exports high-frequency alternating current), after which first carries out decompression processing by reduction voltage circuit 30, it is resent to rectification circuit
40, the buck signal that rectification circuit 40 again exports reduction voltage circuit 30 carries out rectification processing, and is rectified into corresponding direct current
To be supplied to late-class circuit.
Optionally, the rectification circuit 40 of the utility model embodiment can be bridge rectifier.
In the utility model embodiment, leakage current limiting circuit 50 is used to detect the loop voltage of LED drive circuit, and
When the loop voltage of LED drive circuit reaches threshold value, control switch 80 is disconnected, and makes constant current output circuit 70 and rectification circuit 40
It disconnects.Specifically, the leakage current limiting circuit 50 is in institute when normally connecing electricity as Type B type (i.e. fluorescent tube connects alternating current)
The alternating current of input does not have an impact switch 80 when being low frequency ac, and switch 80 remains off, and rectification circuit 40 is defeated
Direct current out is sent to output circuit 70, and output circuit 70 can normally export electric current and give load (LED light) power supply；Work as conduct
Type B type uses, and when the either end in first input end 10 or the second input terminal 20 is linked into the end L of alternating current, the other end
When having human body impedance to be connected to the earth, which can detect LED driving by detecting the circuit built in it
The loop voltage of circuit, and when loop voltage reaches threshold value, control switch 80 disconnects, and to disconnect leakage current, avoids occurring
Danger Electric shock risk.I.e. when the either end in first input end 10 or the second input terminal 20 is linked into the end L of alternating current, if human body touch
When to the other end, which can be detected human body impedance to the earth, and judgement has leakage current, this is let out
Drain current limit circuit 50 is that control switch 80 disconnects, and the first power ground and second source is disconnected, output circuit 70 is not
Electric current can be exported, leakage current circuit is disconnected, leakage current is reduced, human body is avoided to get an electric shock.
Optionally, which may include current-limiting circuit and control circuit.
The input terminal of current-limiting circuit is connect with the output end of rectification circuit 40, the output end of current-limiting circuit and control circuit
Feeder ear connection.Specifically, current-limiting circuit is mainly used for playing metering function to the supply voltage for flowing into control circuit, and control
Circuit mainly for detection of LED drive circuit loop voltage, and when loop voltage reaches threshold value output control signal control
Switch 80 disconnect so that the first power ground and second source disconnect.
In the utility model embodiment, switch 80 is mainly used for the control signal exported according to control circuit and disconnects or close
It closes.Wherein, which can be NMOS tube.
In the utility model embodiment, signal sample circuit 60 is used to detect the alternating current of the second input terminal 20, and the
Bypass leakage current limit circuit 50 when the alternating current of two input terminals 20 is high-frequency alternating current.Specifically, working as inputted exchange
When electricity is low frequency ac, which does not work, and leakage current limiting circuit 50 works normally.When the second input
When 20 alternating currents that are inputted of end are high-frequency alternating current, the signal sample circuit 60 starting, and by leakage current limiting circuit 50
Bypass.It should be noted that the leakage current limiting circuit 50 due to the utility model embodiment makes as Type A
Used time (alternating current inputted is high-frequency alternating current), since the leakage current limiting circuit 50 can not detect electric ballast
High-frequency signal, which, with will lead to the first power ground and second source can not be just without control action
Often conducting, output circuit 70 can not form current loop by the leakage current limiting circuit 50.So by the way that the signal is arranged
Sample circuit 60, can the alternating current inputted be high-frequency alternating current when starting, lead with making the first power ground and second source
Logical, output circuit 70 can form current loop by signal sample circuit 60 and be avoided with normally exporting electric current powering load
Because leakage current limiting circuit 50 cannot work and cause 70 no current circuit of output circuit can not normally export electric current to
Load supplying.
Further, the LED drive circuit of the compatible electronic ballast and alternating current further includes being connected on the first pin and drop
The first current foldback circuit between volt circuit 30, the third overcurrent protection electricity being connected between the second pin and reduction voltage circuit 30
Road and the second current foldback circuit being connected between the second input terminal 20 and reduction voltage circuit 30.
Below with a specific embodiment to the compatible electronic ballast of the utility model and the LED drive circuit of alternating current
Working principle be illustrated.
As shown in Fig. 2, first input end 10 includes the first pin and the second pin；Second input terminal 20 includes third pin
With the 4th pin.Wherein, the first pin is the ACL1 in Fig. 2, and it is Fig. 2 after third pin short circuit that the second pin, which is ACN in Fig. 2,
In ACL2.
First current foldback circuit includes first fuse F1, and the first end of first fuse F1 connects the first pin
(ACL1), the first input end 10 of the first end of the second end connection first capacitor CX1 of first fuse F1 and rectification circuit 40.
Second current foldback circuit includes second fuse F2, and the first end of second fuse F2 connects the second pin and the 4th pin
(ACL2), the first end of the second end of the second end connection first capacitor CX1 of second fuse F2 and the second capacitor CX2, and even
It is connected to the second input terminal 20 of rectification circuit 40；Third current foldback circuit includes third fuse F3, third fuse F3's
First end connects the second pin (ACN), and the second end of third fuse F3 connects the second end of the second capacitor CX2, and is connected to
The third input terminal of rectification circuit 40.
Reduction voltage circuit 30 includes first capacitor CX1 and the second capacitor CX2.The first end of first capacitor CX1 and the first overcurrent
The first end of protection circuit connection, the second end of first capacitor CX1 and the second capacitor CX2 connect the second overcurrent protection electricity together
The second end on road, the second capacitor CX2 is connect with third current foldback circuit.Wherein, more specific connection relationship is for example aforementioned.
Rectification circuit 40 includes diode D1, diode D2, diode D5, diode D6, diode D14 and diode
D15。
Wherein, the anode of diode D15 is connect with the cathode of diode D14, and the anode and diode of diode D15
The node of the cathode connection of D14 is the first input end of rectification circuit 40；The anode of diode D2 and the cathode of diode D6 connect
It connects, and the node that connect with the cathode of diode D6 of the anode of diode D2 is the second input terminal of rectification circuit 40；Diode
The anode of D1 is connect with the cathode of diode D5, and the node that the anode of diode D1 is connect with the cathode of diode D5 is rectification
The third input terminal of circuit 40；The anode of the anode of diode D14, the anode of diode D6 and diode D5 connects first jointly
Power ground (GND1), the cathode of the cathode of diode D15, the cathode of diode D2 and diode D1 are the output of rectification circuit 40
End, is commonly connected to leakage current limiting circuit 50 and output circuit 70.
Leakage current limiting circuit 50 includes: current-limiting circuit and control circuit.
Specifically, as shown in Fig. 2, current-limiting circuit includes diode D3, resistance R5, resistance R6 and resistance R9.Control circuit
Including controlling chip U1, capacitor C5, capacitor C7, resistance R7, resistance R8, capacitor C6.Further, in this embodiment, to open
For pass 80 is built in control chip U1.Wherein, the equivalent circuit diagram controlled inside chip U1 is as shown in Figure 3.
Switch 80 includes metal-oxide-semiconductor Q, and metal-oxide-semiconductor Q is built in the control chip U1；
The control chip U1 includes power supply circuit, logic control circuit and driving circuit, the input of the power supply circuit
The 8th pin of the end connection control chip U1, the output end of the power supply circuit connects the logic control circuit, described
Logic control circuit connects the input terminal of the driving circuit, and the output end of the driving circuit connects the grid of the metal-oxide-semiconductor Q
Pole, the metal-oxide-semiconductor Q drain electrode connection it is described control chip U1 third pin and the 4th pin, the source electrode of the metal-oxide-semiconductor Q and
The logic control circuit connects the 5th pin of the control chip U1 together.
The output end of the anode connection rectification circuit 40 of diode D3, the first of the cathode connection resistance R5 of diode D3
End, the first end of the second end connection resistance R6 of resistance R5, the first end of the second end connection resistance R9 of resistance R6, resistance R9's
Second end connects the feeder ear (controlling the 8th pin of chip U1) of control circuit.It certainly, in other embodiments, can also be with
Omit diode D3.
The 8th pin for controlling chip U1 connects the second end of resistance R9 as the feeder ear of control circuit, controls chip U1
The 8th pin also pass through capacitor C5 the first power ground of connection (GND1)；The second pin for controlling chip U1 connects the first power ground
(GND1), the 6th pin of chip U1 is controlled by the first power ground of capacitor C6 connection (GND1), and the 5th of control chip U1 draws
Foot is connected in parallel on the both ends of resistance R8 by the first power ground of resistance R8 connection (GND1) again after capacitor C7 is in parallel with resistance R7；Control
The third pin and the 4th pin of coremaking piece U1 is shorted and with connecting second source (GND).Certainly, in other embodiments, originally
The switch 80 of utility model can also be placed outside outside control chip U1.The embodiment is built in control chip using switch 80
In U1.Wherein, when switch 80 is using embedding structure, control chip U1 can use the control chip of DL002 model；Work as switch
When 80 use external structure, control chip U1 can use the control chip of DIO8275 model.Switch 80 can use NMOS
Pipe.
What needs to be explained here is that the first power ground (GND1) and second source (GND) be power ground, wherein
One power ground (GND1) is rectification circuit 40 to the power ground between leakage current limiting circuit 50, second source (GND) be
Leakage current limiting circuit 50 is to the power ground between output circuit 70.
Signal sample circuit 60 includes: filter rectifier and metal-oxide-semiconductor Q1.
The input terminal of filter rectifier is connect with the second input terminal 20, the output end and metal-oxide-semiconductor Q1 of filter rectifier
Grid connection, the source electrode of metal-oxide-semiconductor Q1 connects the first power ground, and the drain electrode of metal-oxide-semiconductor Q1 connects leakage current limiting circuit 50.
Specifically, filter rectifier includes: inductance L2, capacitor C9, diode D9, diode D10, capacitor C10, resistance
R16, voltage-stabiliser tube D11.
The first end of inductance L2 connects the second input terminal 20 (ACL2), and the second end of inductance L2 connects the first of capacitor C9
End, the second end of capacitor C9 are separately connected the anode of diode D9 and the cathode of diode D10；The cathode of diode D9 connects
The grid of metal-oxide-semiconductor Q1, the cathode of diode D9 also pass through capacitor C10 the first power ground of connection (GND1)；The anode of diode D10
It connects the first power ground (GND1), resistance R9 is connected in parallel on the both ends of capacitor C10, the grid of the cathode connection metal-oxide-semiconductor Q1 of voltage-stabiliser tube D11
The anode of pole, voltage-stabiliser tube D11 connects the first power ground (GND1).
Further, signal sample circuit 60 further include: be connected to the leakage of leakage current limiting circuit 50 Yu metal-oxide-semiconductor Q1
Anti- circnit NOT between pole.Anti- circnit NOT includes diode D12 and diode D13.
The anode connection leakage current limiting circuit 50 of diode D12 is (as shown in Fig. 2, the anode of diode D12 connects control
The 4th pin and second source of coremaking piece U1 ground (GND)), the drain electrode of the cathode connection metal-oxide-semiconductor Q1 of diode D12, diode
D13 is in parallel with diode D12.It is to be appreciated that in this embodiment, anti-circnit NOT is by diode D12 and diode D13 group
At, in some other embodiment, which can also be made of any one in diode D12 and diode D13,
Alternatively, can also realize anti-reaction using more than two diodes in some other embodiment.
In this embodiment, inductance L2 can play filter action, and capacitor C9 can be played to the second input terminal 20
(ACL2) the detection effect of the signal inputted, diode D9 can play rectified action, and capacitor C10 can play charging and voltage
The effect of maintenance, resistance R16 can play the role of electric discharge, and voltage-stabiliser tube D11 can play clamping action, and metal-oxide-semiconductor Q1 is avoided to damage
It is bad.
As shown in Fig. 2, output circuit 70 includes: capacitor C2, resistance R2, resistance R3, diode D7, transformer L1, capacitor
CE1, resistance R15, resistance R11, resistance R12, diode D8, resistance R10, capacitor C4, capacitor C8, resistance R13, resistance R17,
Metal-oxide-semiconductor Q2, resistance Rs1, resistance Rs2 and chip U2.Transformer L1 includes main winding L1A and auxiliary power supply winding L1B.
The output end of the first end connection rectification circuit 40 of capacitor C2, the second end connection second source of capacitor C2
(GND)；The first end of the first end connection capacitor C2 of resistance R2, the second end of resistance R2 pass through resistance R3 connection chip U2's
PIN5 pin；The first end of the cathode connection resistance R2 of diode D7, the anode of diode D7 are exported by main winding L1A connection
The negative output terminal (LED-) of circuit 70, the anode of diode D7 are also connected with the drain electrode of metal-oxide-semiconductor Q2；Capacitor CE1 is connected to output electricity
The positive output end (LED+) and negative output terminal (LED-) resistance R15 on road 70 are connected in parallel on the both ends of capacitor CE1.
The PIN5 pin of chip U2 passes through the cathode of resistance R10 connection diode D8, and the anode of diode D8 passes through auxiliary
Power winding L1B connection second source ground (GND), and the anode of diode D8 also passes sequentially through resistance R11 and connects the with resistance R12
The connecting node of two power grounds (GND), resistance R11 and resistance R12 are also connected with the PIN4 pin of chip U2；The PIN2 pin of chip
Ground connection, capacitor C4 are connected between the PIN5 pin of chip U2 and PIN2 pin；The PIN3 pin of chip U2 passes sequentially through capacitor
With connecting second source (GND), the PIN2 pin of chip U2 passes through the grid of resistance R17 connection metal-oxide-semiconductor Q2 by C8 and resistance R13,
The source electrode of the PIN1 pin connection metal-oxide-semiconductor Q2 of chip U2, the PIN1 pin of chip U2 are also connected by resistance Rs1, resistance Rs2 respectively
With connecing second source (GND).
The compatible electronic ballast of the embodiment and the LED drive circuit of alternating current can be compatible with alternating current (Type B class simultaneously
Type) single-termination electricity/both-end connect electricity and compatible electronic ballast (Type type-A), can also be used as Type type-A or Type
B type is used alone.It is illustrated below with different situations:
The first situation: when normally connecing electricity as Type B type (alternating current) both-end:
Signal use the capacitor C9 in circuit detect ACL2 input signal for the ac signal of low frequency 50/60Hz,
At this point, no electric current flows through diode D9 by the effect of capacitor C9, the grid of metal-oxide-semiconductor Q1 is not up to its cut-in voltage, at this point,
Metal-oxide-semiconductor Q1 is in off state, and signal does not generate effect using circuit.Control chip U1 inspection in leakage current limiting circuit 50
The voltage for surveying its 5th pin is kept closed built-in switch 80 when the voltage of the 5th pin is not up to threshold value, with
It is connected to the first power ground (GND1) with second source (GND), output circuit 70 can be exported with normal constant-current, give load (LED
Lamp) power supply.It is to be appreciated that sampling electricity of the control chip U1 in the loop voltage that the voltage of the 5th pin is LED drive circuit
The case where pressure, which can be with feedback loop voltage, by detecting the sampled voltage (electricity of control the 5th pin of chip U1
Pressure) it can detecte the loop voltage of LED drive circuit.
Second case: as Type B type it is single-ended normally connect electricity when:
Second input terminal 20 (ACL2) does not have voltage, and signal sample circuit 60 detects that the end ACL2 does not have input signal, this
When, metal-oxide-semiconductor Q1 is also at off state, and signal does not generate effect using circuit.Control core in leakage current limiting circuit 50
Piece U1 detects the voltage of its 5th pin, when the voltage of the 5th pin is not up to threshold value, remains closed built-in switch 80
State is connected to the first power ground (GND1) with second source (GND), and output circuit 70 can be exported with normal constant-current, to negative
Carry (LED light) power supply.
The third situation: when touching power connection end as Type B type human body:
When fluorescent tube one end (assuming that first input end 10 is linked into the end alternating current L (firewire)), human body touch to other end
(ACL2) when, at this point, the control chip U1 judgement in leakage current limiting circuit 50 has leakage current, and then built-in open is controlled
Close 80 disconnect, at this point, the first power ground (GND1) and second source (GND) disconnection, leakage current circuit is disconnected, reduces
Leakage current makes human body not get an electric shock.Specifically, as shown in figure 3, the logic control circuit real-time detection of control chip U1
The voltage of 5th pin judges the impedance loop of LED drive circuit by the voltage of the 5th pin.Under normal circumstances, human body hinders
Resist for 1~2K Ω or so, as impedance loop >=500 Ω, Leakage Current instantaneous peak value > 5mA, leakage current produces on R7, R8
Raw voltage reaches IC leakage current protection trigger point voltage (threshold value), and logic control circuit is controlled to driving circuit low-voltage to be believed
Number, metal-oxide-semiconductor Q is turned off, leakage current circuit is disconnected, reduces leakage current, logic control can reopen after turning off a period of time
Metal-oxide-semiconductor Q is detected again, once current peak reaches 5mA turns off metal-oxide-semiconductor Q at once, is reduced leakage current, is so periodically detected,
So that the virtual value of leakage current is able to maintain within 5mA.After metal-oxide-semiconductor Q unlatching when leakage current < 5mA, metal-oxide-semiconductor Q can be always
It opens, so that subsequent output circuit 70 can work normally.
4th kind of situation: when connecing electricity as Type type-A (connecing electric ballast):
The high-frequency alternating current that first capacitor CX1 and/or the second capacitor CX2 in reduction voltage circuit 30 export electric ballast
Pressure is depressured, and a certain range of alternating voltage (for example, can be < 300V, the alternating voltage of 60~80KHz) be exported, into
And have the function that protect late-class circuit, make late-class circuit not caused to damage by excessively high voltage breakdown, moreover, exporting at this time
Circuit 70 can be exported with normal constant-current, give load (LED light) power supply.
Specifically, in this case due to leakage current limiting circuit 50, the high frequency of electric ballast output can not be detected
Signal, leakage current limiting circuit 50 without control action, at this time the first power ground (GND1) and second source (GND) can not be just
Often conducting causes output circuit 70 that can not form current loop by leakage current limiting circuit 50；And due to signal sampling electricity
The signal that road 60 can detecte the end ACL2 is the high-frequency signal of high frequency (60~80KHz), has electric current to flow to metal-oxide-semiconductor Q1's at this time
Grid, metal-oxide-semiconductor Q1 are opened, at this time the first power ground (GND1) and second source (GND) be connected, lead to output circuit 70
It crosses signal sample circuit 60 and forms current loop, avoid leading to output circuit because leakage current limiting circuit 50 cannot work
70 no current circuits can not work.
The utility model additionally provides a kind of LED lamp, the LED lamp may include compatible electronic ballast above-mentioned and
The LED drive circuit of alternating current.
The utility model can simultaneously compatible electronic ballast and alternating current, electronics can be reduced automatically when connecing electric ballast
The high frequency voltage of ballast output, effective protection late-class circuit；When connecing alternating current, single-termination electricity can be met and both-end connects electricity, and
Both-end, which connects electricity, can pass through leakage current testing.
In addition, the LED lamp of the utility model can be in use, can be directly with this reality in the electric ballast of fluorescent lamp
Original fluorescent lamp is replaced with novel LED light, is saved labour turnover；In the electric ballast end-of-life of fluorescent lamp, also only
Electronic ballast for fluoresent lamp need to be removed, the LED light of the utility model can be continued to use by carrying out simple refit to circuit, save purchase
Set fluorescent tube cost.Simultaneously because there is leakage current to protect circuit, when LED light one end of the utility model is charged, human body is touched at this time
The danger of electric shock is not had when touching the fluorescent tube other end, security performance is high.
Above embodiments are only to illustrate the technical ideas and features of the present invention, and its object is to allow be familiar with technique
Personage can understand the content of the utility model and implement accordingly, the protection scope of the utility model can not be limited.It is all with
The equivalent changes and modifications that the utility model claims range is done, should belong to the utility model claims covers model
It encloses.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations all should belong to the protection scope of the appended claims for the utility model.
Claims (10)
1. a kind of LED drive circuit of compatible electronic ballast and alternating current characterized by comprising
First input end, the second input terminal and the first input end and second input terminal for receiving alternating current connect
The reduction voltage circuit that connects, the rectification circuit being connect with the reduction voltage circuit, the leakage current being connect with rectification circuit limitation electricity
Road, the constant current output circuit being connect with the leakage current limiting circuit, respectively with second input terminal and the leakage electricity
The signal sample circuit of ductility limit circuit connection and the switch being connect with the leakage current limiting circuit；
The alternating current be electric ballast output high-frequency alternating current when, the reduction voltage circuit to the high-frequency alternating current into
Row decompression, and output buck signal；The rectification circuit is used to the AC rectification of the buck signal or low frequency be straight
Galvanic electricity；The signal sample circuit detects the alternating current of second input terminal, and is in the alternating current of second input terminal
The leakage current limiting circuit is bypassed when high-frequency alternating current；
When the alternating current is low frequency ac, the leakage current limiting circuit is used to detect the circuit of LED drive circuit
Voltage, and control when the loop voltage of LED drive circuit reaches threshold value the switch and disconnect, make the constant current output circuit with
The rectification circuit disconnects.
2. the LED drive circuit of compatible electronic ballast and alternating current according to claim 1, which is characterized in that described
One input terminal includes the first pin and the second pin；
The LED drive circuit of the compatible electronic ballast and alternating current further includes being connected on first pin and decompression electricity
The first current foldback circuit between road, the third overcurrent protection electricity being connected between second pin and the reduction voltage circuit
Road and the second current foldback circuit being connected between second input terminal and the reduction voltage circuit.
3. the LED drive circuit of compatible electronic ballast and alternating current according to claim 2, which is characterized in that the drop
Volt circuit includes first capacitor and the second capacitor；
The first end of the first capacitor is connect with first current foldback circuit, the second end of the first capacitor and described
The first end of second capacitor connects second current foldback circuit, the second end of second capacitor and the third mistake together
Stream protection circuit connection.
4. the LED drive circuit of compatible electronic ballast and alternating current according to claim 3, which is characterized in that described to let out
Drain current limit circuit includes: current-limiting circuit and control circuit；
The input terminal of the current-limiting circuit is connect with the output end of the rectification circuit, the output end of the current-limiting circuit with it is described
The feeder ear of control circuit connects.
5. the LED drive circuit of compatible electronic ballast and alternating current according to claim 4, which is characterized in that the limit
Current circuit includes diode D3, resistance R5, resistance R6 and resistance R9；
The anode of the diode D3 connects the output end of the rectification circuit, and the cathode of the diode D3 connects the resistance
The first end of R5, the second end of the resistance R5 connect the first end of the resistance R6, and the second end of the resistance R6 connects institute
The first end of resistance R9 is stated, the second end of the resistance R9 connects the feeder ear of the control circuit.
6. the LED drive circuit of compatible electronic ballast and alternating current according to claim 5, which is characterized in that the control
Circuit processed includes control chip U1, capacitor C5, capacitor C7, resistance R7, resistance R8, capacitor C6；
The switch includes metal-oxide-semiconductor Q, and the metal-oxide-semiconductor Q is built in the control chip U1；
The control chip U1 includes power supply circuit, logic control circuit and driving circuit, and the input terminal of the power supply circuit connects
The 8th pin of the control chip U1 is connect, the output end of the power supply circuit connects the logic control circuit, the logic
Control circuit connects the input terminal of the driving circuit, and the output end of the driving circuit connects the grid of the metal-oxide-semiconductor Q, institute
It states the third pin and the 4th pin of the drain electrode connection control chip U1 of metal-oxide-semiconductor Q, the source electrode of the metal-oxide-semiconductor Q and described patrols
Collect the 5th pin that control circuit connects the control chip U1 together；
The 8th pin of the control chip U1 connects the second end of the resistance R9, institute as the feeder ear of the control circuit
The 8th pin of control chip U1 is stated also by the first power ground of the capacitor C5 connection；
The second pin of the control chip U1 connects the first power ground, and the 6th pin of the control chip U1 passes through the electricity
Hold the first power ground of C6 connection, the 5th pin of the control chip U1 is described by the first power ground of the resistance R8 connection
The both ends of the resistance R8 are connected in parallel on after capacitor C7 is in parallel with the resistance R7 again；The third pin and the of the control chip U1
Four pins are shorted and with connecting second source.
7. the LED drive circuit of compatible electronic ballast and alternating current according to claim 1, which is characterized in that the letter
Number sample circuit includes: filter rectifier and metal-oxide-semiconductor Q1；
The input terminal of the filter rectifier is connect with second input terminal, the output end of the filter rectifier and institute
The grid for stating metal-oxide-semiconductor Q1 connects, source electrode the first power ground of connection of the metal-oxide-semiconductor Q1, described in the drain electrode connection of the metal-oxide-semiconductor Q1
Leakage current limiting circuit.
8. the LED drive circuit of compatible electronic ballast and alternating current according to claim 7, which is characterized in that the filter
Wave rectification circuit includes: inductance L2, capacitor C9, diode D9, diode D10, capacitor C10, resistance R16, voltage-stabiliser tube D11；
The first end of the inductance L2 connects second input terminal, and the second end of the inductance L2 connects the of the capacitor C9
One end, the second end of the capacitor C9 are separately connected the anode of the diode D9 and the cathode of the diode D10；Described two
The cathode of pole pipe D9 connects the grid of the metal-oxide-semiconductor Q1, and the cathode of the diode D9 also passes through the capacitor C10 connection first
Power ground；The cathode of the diode D10 connects the first power ground, and the resistance R9 is connected in parallel on the both ends of the capacitor C10, institute
The cathode for stating voltage-stabiliser tube D11 connects the grid of the metal-oxide-semiconductor Q1, and the anode of the voltage-stabiliser tube D11 connects the first power ground.
9. the LED drive circuit of compatible electronic ballast and alternating current according to claim 7, which is characterized in that the letter
Number sample circuit further include: the anti-circnit NOT being connected between the leakage current limiting circuit and the drain electrode of the metal-oxide-semiconductor Q1；
The anti-circnit NOT includes diode D12 and diode D13；
The anode of the diode D12 connects the leakage current limiting circuit, described in the cathode connection of the diode D12
The drain electrode of metal-oxide-semiconductor Q1, the diode D13 are in parallel with the diode D12.
10. a kind of LED lamp, which is characterized in that including the described in any item compatible electronic ballasts of claim 1-9 and alternating current
LED drive circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821255533.4U CN208581381U (en) | 2018-08-06 | 2018-08-06 | A kind of LED drive circuit and LED lamp of compatible electronic ballast and alternating current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821255533.4U CN208581381U (en) | 2018-08-06 | 2018-08-06 | A kind of LED drive circuit and LED lamp of compatible electronic ballast and alternating current |
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| CN208581381U true CN208581381U (en) | 2019-03-05 |
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ID=65511853
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821255533.4U Active CN208581381U (en) | 2018-08-06 | 2018-08-06 | A kind of LED drive circuit and LED lamp of compatible electronic ballast and alternating current |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109068442A (en) * | 2018-08-06 | 2018-12-21 | 深圳拓邦股份有限公司 | A kind of LED drive circuit and LED lamp of compatible electronic ballast and alternating current |
| CN110822303A (en) * | 2019-10-31 | 2020-02-21 | 厦门普为光电科技有限公司 | LED lamp tube compatible with electronic ballast and mains supply |
| CN111542147A (en) * | 2020-06-01 | 2020-08-14 | 厦门普为光电科技有限公司 | Lamp tube with electric shock protection and compatible electronic ballast and power frequency AC power supply |
| CN111757574A (en) * | 2020-06-02 | 2020-10-09 | 领光照明科技(上海)有限公司 | Double-end LED fluorescent tube of self-adaptation high low frequency |
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2018
- 2018-08-06 CN CN201821255533.4U patent/CN208581381U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109068442A (en) * | 2018-08-06 | 2018-12-21 | 深圳拓邦股份有限公司 | A kind of LED drive circuit and LED lamp of compatible electronic ballast and alternating current |
| CN109068442B (en) * | 2018-08-06 | 2024-03-29 | 深圳拓邦股份有限公司 | LED drive circuit compatible with electronic ballast and mains supply and LED lamp |
| CN110822303A (en) * | 2019-10-31 | 2020-02-21 | 厦门普为光电科技有限公司 | LED lamp tube compatible with electronic ballast and mains supply |
| CN110822303B (en) * | 2019-10-31 | 2022-08-30 | 厦门普为光电科技有限公司 | LED lamp tube compatible with electronic ballast and mains supply |
| CN111542147A (en) * | 2020-06-01 | 2020-08-14 | 厦门普为光电科技有限公司 | Lamp tube with electric shock protection and compatible electronic ballast and power frequency AC power supply |
| CN111757574A (en) * | 2020-06-02 | 2020-10-09 | 领光照明科技(上海)有限公司 | Double-end LED fluorescent tube of self-adaptation high low frequency |
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