CN209627761U - LED Drive Protecting Circuit - Google Patents
LED Drive Protecting Circuit Download PDFInfo
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- CN209627761U CN209627761U CN201822229119.2U CN201822229119U CN209627761U CN 209627761 U CN209627761 U CN 209627761U CN 201822229119 U CN201822229119 U CN 201822229119U CN 209627761 U CN209627761 U CN 209627761U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The utility model discloses a kind of LED Drive Protecting Circuit, LED Drive Protecting Circuit includes ac power input end, EMC filter circuit, rectification circuit, control chip, transformer, switching tube, first diode, second diode, zener diode, overvoltage protection resistance, overcurrent protection resistance, chip is controlled according to the corresponding output pwm control signal control switch pipe work of the end voltage of overcurrent protection resistance, when LED Drive Protecting Circuit overcurrent, zener diode is connected when the voltage for biasing winding rises and is greater than conducting voltage, and output current to overcurrent protection resistance, chip is controlled when the end voltage of overcurrent protection resistance is greater than predeterminated voltage, output switch control signal controls the switching tube shutdown, to realize overvoltage protection and overcurrent protection.And it without increasing additional over-voltage detection chip and detection feed circuit at LED power end, simplifies the circuit structure of LED Drive Protecting Circuit and reduces design cost.
Description
Technical field
The utility model relates to technical field of LED light illumination, in particular to a kind of LED Drive Protecting Circuit.
Background technique
With the high speed development of semiconductor light-emitting-diode (LED) technology, the LED lamp as normal lighting lamps and lanterns has
Efficiently, the long-life, it is safe and environment-friendly the advantages that, have the trend instead of incandescent lamp, fluorescent lamp, but LED needs low-voltage direct to supply
Electricity, cannot the AC power source directly with daily alternating current 220V be directly connected to, need special power circuit, power circuit will input
AC rectification, output is to LED after pressure regulation, and according to the output different duty control switch conducting of control chip or shutdown
Carry out the control of PWM intelligent dimming.
In order to guarantee that LED output is stable and safe, additional detection feedback electricity is generally configured in LED power input terminal
Road and the over-voltage detection chip that foot is detected with over-voltage, the over-voltage signal that over-voltage detection chip will test are exported to control core
Piece controls chip controls switch OFF, and stops the output of DC power supply, realizes overvoltage protection, until LED output end voltage is steady
It is fixed, but since over-voltage detection chip is expensive, increases additional over-voltage detection chip and detection feed circuit and increase electricity
Road design cost, and cause circuit construction of electric power complicated.
Utility model content
The main purpose of the utility model is to provide a kind of LED Drive Protecting Circuit, it is intended to solve when detecting LED over-voltage
Increase additional over-voltage detection chip and detection feed circuit and increase circuit design cost, and causes circuit construction of electric power multiple
Miscellaneous problem.
To achieve the above object, the utility model proposes LED Drive Protecting Circuit include ac power input end, EMC
Filter circuit, rectification circuit, control chip, transformer, switching tube, first diode, the second diode, zener diode, mistake
Protective resistance, overcurrent protection resistance are pressed, the transformer includes armature winding, biasing winding and secondary windings；
The power input of the EMC filter circuit is connect with the ac power input end, the EMC filter circuit
Power output end is connect with the power input of the rectification circuit, the power output end anode of the rectification circuit, the control
The interconnection of the first end of the power end of coremaking piece and the armature winding, the power output end cathode ground connection of the rectification circuit, institute
The second end for stating armature winding is connect with the input terminal of the switching tube, the controlled end of the switching tube and the control chip
Control terminal connection, the output end of the switching tube, the control voltage detection terminal of chip, the overvoltage protection resistance first
The interconnection of the first end of end and the overcurrent protection resistance, the first end of the biasing winding and the anode of first diode connect,
The cathode of the first diode is connect with the cathode of the zener diode, anode and the over-voltage of the zener diode
The second end of protective resistance connects, and the biasing winding and the overcurrent protection resistance are grounded, and the first of the secondary windings
End is connect with second diode, and second diode is connect with the power input of the LED, the secondary windings
Second segment ground connection；
The EMC filter circuit, for being filtered to the AC power source of input and electromagnetism is anti-interference；
The rectification circuit for rectifying to the AC power source, and exports the first DC power supply to the control
Chip and the armature winding；
The secondary windings for coupling with the armature winding, and exports the second DC power supply to the LED；
The biasing winding for coupling with the secondary windings, and exports third DC power supply to the control chip；
The zener diode, for being connected when the voltage of the biasing winding rises and is greater than conducting voltage, and it is defeated
Electric current is to the overcurrent protection resistance out；
The overvoltage protection resistance, for carrying out current limliting to the electric current for flowing through the zener diode；
The control chip, for according to the corresponding output pwm control signal control of the end voltage of the overcurrent protection resistance
The switching tube work, and when the end voltage of the overcurrent protection resistance is greater than predeterminated voltage, output switch control signal
Control the switching tube shutdown.
Preferably, the EMC filter circuit includes first capacitor, first resistor and the first choking-winding；
The both ends of the first capacitor, the first resistor both ends respectively it is corresponding with the ac power input end connect
It connects, the ac power input end is also connect through first choking-winding with the power input of the rectification circuit.
Preferably, the rectification circuit protection rectifier bridge and the second capacitor；
The power input of the rectifier bridge is the power input of the rectification circuit, the power supply output of the rectifier bridge
The both ends respectively with second capacitor are held to be correspondingly connected with.
Preferably, the LED Drive Protecting Circuit further includes for feeding back the LED Drive Protecting Circuit output voltage
Feed circuit；
First signal end of the feed circuit is connect with the output end of the secondary windings, and the second of the feed circuit
Signal end is connect with the feedback signal terminal of the control chip.
Preferably, the feed circuit includes second resistance, 3rd resistor, the 4th resistance, the 5th resistance, photoelectric coupling
Device, voltage-stablizer and third capacitor；
The first end of the first end of the second resistance, the first end of the 3rd resistor and the secondary windings interconnects,
The first end of the second end of the second resistance, the first end of the photoelectrical coupler and the 4th resistance connects, and described the
The input of the second end of four resistance, the second end of the photoelectrical coupler, the first end of the third capacitor and the voltage-stablizer
End interconnection, the second end of the 3rd resistor, the second end of the third capacitor, the first end of the 5th resistance and described steady
The output end of depressor interconnects, and the second end of the ground terminal of the voltage-stablizer and the 5th resistance is grounded.
Preferably, the LED Drive Protecting Circuit further includes for carrying out the of voltage protection to the first diode
One absorption circuit, the first absorption circuit include the 6th resistance and the 4th capacitor；
The first end connection of the first end, the positive and described biasing winding of the first diode of 6th resistance,
The second end of 6th resistance is connect with the first end of the 4th capacitor, the second end of the 4th capacitor, described first
The power end connection of the cathode of diode, the cathode of the voltage-stabiliser tube and the control chip.
Preferably, the LED Drive Protecting Circuit further includes the 7th resistance, the first end and the control of the 7th resistance
The voltage detection terminal of coremaking piece connects, and the second end of the 7th resistance is connect with the first end of the overcurrent protection resistance.
Preferably, the LED Drive Protecting Circuit further includes the 8th resistance and third diode, and the of the 8th resistance
One end, the third diode cathode and it is described control chip control terminal interconnection, the third diode it is positive, described
The second end of 8th resistance and the controlled end interconnection of the switching tube.
Preferably, the LED Drive Protecting Circuit further includes inhaling for carrying out the second of voltage protection to the switching tube
Road is withdrawn, the absorption circuit includes the 9th resistance, the 5th capacitor and the 4th diode；
The power output end of the first end of 9th resistance, the first end of the 5th capacitor and the rectification circuit is just
Pole interconnection, the cathode connection of the second end of the 9th resistance, the second end of the 5th capacitor and the 4th diode, institute
The anode for stating the 4th diode is connect with the input terminal of the switching tube.
Preferably, the LED Drive Protecting Circuit further includes for carrying out voltage guarantor to output to second diode
The third absorption circuit of shield, the third absorption circuit includes the 6th capacitor and the tenth resistance；
The anode of the first end of 6th capacitor and second diode connect, the second end of the 6th capacitor and
The first end of tenth resistance connects, and the second end of the tenth resistance is connect with the cathode of second diode.
Technical solutions of the utility model are by using ac power input end, EMC filter circuit, rectification circuit, control core
Piece, transformer, switching tube, first diode, the second diode, zener diode, overvoltage protection resistance, overcurrent protection resistance group
At LED Drive Protecting Circuit, chip is controlled according to the corresponding output pwm control signal control switch of the end voltage of overcurrent protection resistance
Pipe work, when LED Drive Protecting Circuit overcurrent, zener diode is when the voltage for biasing winding rises and is greater than conducting voltage
Conducting, and overcurrent protection resistance is outputed current to, control chip is defeated when the end voltage of overcurrent protection resistance is greater than predeterminated voltage
Switch control signal controls the switching tube shutdown out, to realize overvoltage protection and overcurrent protection.And without in LED power
End increases additional over-voltage detection chip and detection feed circuit, simplifies circuit structure and the reduction of LED Drive Protecting Circuit
Design cost.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, the structure that can also be shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the electrical block diagram of one embodiment of the utility model LED Drive Protecting Circuit；
Fig. 2 is the electrical block diagram of another embodiment of the utility model LED Drive Protecting Circuit.
The embodiments will be further described with reference to the accompanying drawings for the realization, functional characteristics and advantage of the utility model aim.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describing, it is clear that described embodiment is only a part of the embodiment of the utility model, rather than all
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, fall within the protection scope of the utility model.
It is to be appreciated that the description for being related to " first ", " second " etc. in the present invention is used for description purposes only, and cannot
It is interpreted as its relative importance of indication or suggestion or implicitly indicates the quantity of indicated technical characteristic.Define as a result, " the
One ", the feature of " second " can explicitly or implicitly include at least one of the features.In addition, the "and/or" occurred in full text
Meaning are as follows: including three schemes arranged side by side, by taking " A/B " as an example, including the side that A scheme or B scheme or A and B meet simultaneously
Case in addition, the technical solution between each embodiment can be combined with each other, but must be with those of ordinary skill in the art's energy
It is enough realize based on, will be understood that the knot of this technical solution when conflicting or cannot achieve when occurs in the combination of technical solution
Conjunction is not present, also not within the protection scope of the requires of the utility model.
The utility model proposes a kind of LED Drive Protecting Circuits.
As shown in FIG. 1, FIG. 1 is the electrical block diagram of one embodiment of the utility model LED Drive Protecting Circuit, this realities
Apply in example, LED Drive Protecting Circuit include ac power input end, EMC filter circuit 10, rectification circuit 20, control chip U1,
Transformer T1, switching tube Q1, first diode D1, the second diode D2, zener diode Z1, overvoltage protection resistance Rv, overcurrent
Protective resistance Ra, the transformer T1 include armature winding T1-A, biasing winding T1-B and secondary windings T1-C；
The power input of the EMC filter circuit 10 is connect with the ac power input end, the EMC filter circuit
10 power output end is connect with the power input of the rectification circuit 20, and the power output end of the rectification circuit 20 is just
The first end interconnection of pole, the power end of the control chip U1 and the armature winding T1-A, the power supply of the rectification circuit 20
Negative pole of output end ground connection, the second end of the armature winding T1-A are connect with the input terminal of the switching tube Q1, the switching tube
The controlled end of Q1 connect with the control terminal of the control chip U1, and the output end of the switching tube Q1 described controls chip U1
The first end of voltage detection terminal, the first end of the overvoltage protection resistance Rv and the overcurrent protection resistance Ra interconnects, described inclined
The first end for setting winding T1-B is connect with the anode of first diode D1, the cathode of the first diode D1 and the pressure stabilizing two
The cathode of pole pipe Z1 connects, and the anode of the zener diode Z1 is connect with the second end of the overvoltage protection resistance Rv, described
The biasing winding T1-B and overcurrent protection resistance Ra is grounded, the first end of the secondary windings T1-C and the two or two pole
Pipe D2 connection, the second diode D2 are connect with the power input of the LED, and the second segment of the secondary windings T1-C connects
Ground；
The EMC filter circuit 10, for being filtered to the AC power source of input and the anti-interference protection of electromagnetism；
The rectification circuit 20 for rectifying to the AC power source, and exports the first DC power supply to the control
The coremaking piece U1 and armature winding T1-A；
The secondary windings T1-C, for couple with the armature winding T1-A, and the second DC power supply of output is to described
LED；
The biasing winding T1-B for coupling with the secondary windings T1-C, and exports third DC power supply to described
Control chip U1；
The zener diode Z1, for being led when the voltage of the biasing winding T1-B rises and is greater than conducting voltage
It is logical, and output current to the overcurrent protection resistance Ra；
The overvoltage protection resistance Rv, for carrying out current limliting to the electric current for flowing through the zener diode Z1；
The control chip U1, for according to the corresponding output pwm control signal of the end voltage of the overcurrent protection resistance Ra
The switching tube Q1 work is controlled, and when the end voltage of the overcurrent protection resistance Ra is greater than predeterminated voltage, output switch
It controls signal and controls the switching tube Q1 shutdown.
In the present embodiment, electromagnetic interference is can be effectively suppressed in EMC filter circuit 10, provide efficiently stable output voltage and
Electric current, in the present embodiment, EMC filter circuit 10 includes the first capacitor C1 for filtering, first resistor R1 and anti-for electromagnetism
Interference the first choking-winding, the both ends of the first capacitor C1, the first resistor R1 both ends respectively with the alternating current
Source input terminal is correspondingly connected with, the ac power input end also power supply through first choking-winding Yu the rectification circuit 20
Input terminal connection.
Rectification circuit 20 is used to be rectified in the alternating current after filtering and exports the first DC power supply to transformer T1
With control chip U1, the inside control chip U1 is equipped with turn-on threshold voltage, and the first DC supply input to control chip U1 simultaneously makes
It is started to work, and overcurrent protection resistance Ra is for sensing primary current, and control chip U1 is according to detection overcurrent protection resistance Ra's
It holds the duty ratio of voltage cut-out pipe Q1 and then controls transformer T1 secondary output current, to control LED operation.
When circuit, which works normally, to be exported, zener diode Z1 cut-off, when cause for some reason output to LED
Overtension when, the secondary windings T1-C of transformer T1 be coupled to biasing winding T1-B voltage rise, when biasing winding T1-
When the voltage of B is greater than the conducting voltage of zener diode Z1, zener diode Z1 conducting, secondary windings T1-C is through zener diode
The circuit of Z1, overvoltage protection resistance Rv and overcurrent protection resistance Ra composition exports electric current, at this time the end electricity of overcurrent protection resistance Ra
Pressure are as follows: " electric current for flowing through switching tube Q1 "+" electric current for flowing through zener diode Z1 ") * overcurrent protection resistance Ra resistance value, served as
When the end voltage for flowing protective resistance Ra is greater than the threshold value protection voltage for controlling chip U1, control chip U1 then exports switch control letter
Number, i.e., the pwm signal that output duty cycle is zero is turned off to switching tube Q1, switching tube Q1, thus the output cut off the power, realization is electric
Press the purpose of protection.
First diode D1 and the second diode D2 plays the role of one-way flow for preventing voltage from feeding back.
Rectification circuit 20 can be used rectifier bridge or half-wave rectifying circuit 20, in the present embodiment, generally use rectifier bridge into
Row rectification, the output end of rectifier bridge are further connected with the second capacitor C2 for filtering.
In the present embodiment, switching tube Q1 uses metal-oxide-semiconductor.
Technical solutions of the utility model are by using ac power input end, EMC filter circuit 10, rectification circuit 20, control
Coremaking piece U1, transformer T1, switching tube Q1, first diode D1, the second diode D2, zener diode Z1, overvoltage protection electricity
It hinders Rv, overcurrent protection resistance Ra and forms LED Drive Protecting Circuit, control chip U1 according to the end voltage pair of overcurrent protection resistance Ra
Pwm control signal control switch pipe Q1 work should be exported, when LED Drive Protecting Circuit overcurrent, zener diode Z1 is being biased
The voltage of winding T1-B rises and is connected when being greater than conducting voltage, and outputs current to overcurrent protection resistance Ra, controls chip U1
When the end voltage of overcurrent protection resistance Ra is greater than predeterminated voltage, output switch control signal controls the switching tube Q1 shutdown,
To realize overvoltage protection and overcurrent protection.And it is anti-without increasing additional over-voltage detection chip and detection at LED power end
Current feed circuit 30 simplifies the circuit structure of LED Drive Protecting Circuit and reduces design cost.
As shown in Fig. 2, Fig. 2 is the electrical block diagram of another embodiment of the utility model LED Drive Protecting Circuit, this
In embodiment, the LED Drive Protecting Circuit further includes the feedback electricity for feeding back the LED Drive Protecting Circuit output voltage
Road 30；
First signal end of the feed circuit 30 is connect with the output end of the secondary windings T1-C, the feed circuit
30 second signal end is connect with the feedback signal terminal of the control chip U1.
In the present embodiment, the voltage of the power input of LED is fed back to control core by electric resistance partial pressure by feed circuit 30
Piece U1, control chip U1 can further judge output voltage whether over-voltage, zener diode Z1 damage when can also pass through feedback
Circuit 30 carries out voltage protection.
In an alternative embodiment, the feed circuit 30 include second resistance R2,3rd resistor R3, the 4th resistance R4,
5th resistance R5, photoelectrical coupler U2, voltage-stablizer U3 and third capacitor C3；
The first of the first end of the second resistance R2, the first end of the 3rd resistor R3 and the secondary windings T1-C
End interconnection, the first of the second end of the second resistance R2, the first end of the photoelectrical coupler U2 and the 4th resistance R4
End connection, second end, the second end of the photoelectrical coupler U2, the first end of the third capacitor C3 of the 4th resistance R4
And the input terminal interconnection of the voltage-stablizer U3, it is the second end of the 3rd resistor R3, the second end of the third capacitor C3, described
The interconnection of the output end of the first end of 5th resistance R5 and the voltage-stablizer U3, the ground terminal of the voltage-stablizer U3 and the 5th electricity
The second end of resistance R5 is grounded.
In the present embodiment, output voltage passes through second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance respectively
R5 and voltage-stablizer U3 carries out pressure stabilizing and partial pressure, and output voltage is fed back to control chip U1 through photoelectrical coupler U2, controls core
Piece U1 corresponds to output pwm signal control switch pipe Q1 work.
In an alternative embodiment, the LED Drive Protecting Circuit further includes for carrying out to the first diode D1
First absorption circuit 40 of voltage protection, the first absorption circuit 40 include the 6th resistance R6 and the 4th capacitor C4；
The first end of the 6th resistance R6, the positive and described of the first diode D1 bias the first of winding T1-B
End connection, the second end of the 6th resistance R6 connect with the first end of the 4th capacitor C4, and the of the 4th capacitor C4
The power end connection at two ends, the cathode of the first diode D1, the cathode of the voltage-stabiliser tube and the control chip U1.
In the present embodiment, the 6th resistance R6 and the 4th capacitor C4 form the first absorption circuit 40, for inhibiting surge voltage
Influence to first diode D1, to protect first diode D1 pressure resistance deficiency that will not cause possible damage.
In an alternative embodiment, the LED Drive Protecting Circuit further includes the 7th resistance R7, and the 7th resistance R7 is for limiting
Flow point pressure, the voltage received with the voltage detection terminal of guarantee control chip U1 are described in the working range of control chip U1
The first end of 7th resistance R7 is connect with the voltage detection terminal of the control chip U1, the second end of the 7th resistance R7 and institute
State the first end connection of overcurrent protection resistance Ra.
In an alternative embodiment, the LED Drive Protecting Circuit further includes the 8th resistance R8 and third diode D3, institute
The control terminal interconnection of the first end of the 8th resistance R8, the cathode of the third diode D3 and the control chip U1 is stated, it is described
The second end of positive, the described 8th resistance R8 of third diode D3 and the controlled end interconnection of the switching tube Q1.
8th resistance R8 and third diode D3 composition switching tube Q1 protects circuit, divides for current limliting, to guarantee to switch
The controlled end voltage of pipe Q1 within a preset range, prevents from burning switching tube Q1.
In an alternative embodiment, the LED Drive Protecting Circuit further includes for carrying out voltage to the switching tube Q1
Second absorption circuit 50 of protection, the absorption circuit include the 9th resistance R9, the 5th capacitor C5 and the 4th diode D4；
The power supply of the first end of the 9th resistance R9, the first end of the 5th capacitor C5 and the rectification circuit 20 is defeated
The interconnection of outlet anode, the second end of the 9th resistance R9, the second end of the 5th capacitor C5 and the 4th diode D4
Cathode connection, the 4th diode D4 anode connect with the input terminal of the switching tube Q1.
In the present embodiment, the 9th resistance R9, the 5th capacitor C5 and with the 4th diode D4 form the second absorption circuit
50, for inhibiting the influence of surge voltage switch tube Q1, possible damage will not be caused with protective switch pipe Q1 pressure resistance deficiency.
In an alternative embodiment, the LED Drive Protecting Circuit further includes for output to second diode
D2 carries out the third absorption circuit 60 of voltage protection, and the third absorption circuit 60 includes the 6th capacitor C6 and the tenth resistance
R10；
The anode of the first end of the 6th capacitor C6 and the second diode D2 are connect, and the of the 6th capacitor C6
Two ends are connect with the first end of the tenth resistance R10, and the second end of the tenth resistance R10 is with the second diode D2's
Cathode connection.
In the present embodiment, the 6th capacitor C6 and the tenth resistance R10 form third absorption circuit 60, for inhibiting surge voltage
Influence to the second diode D2, to protect the second diode D2 pressure resistance deficiency that will not cause possible damage.
The above is only the preferred embodiment of the present invention, and therefore it does not limit the scope of the patent of the utility model,
It is all under the inventive concept of the utility model, equivalent structure made based on the specification and figures of the utility model becomes
It changes, or directly/be used in other related technical areas indirectly and be included in the scope of patent protection of the utility model.
Claims (10)
1. a kind of LED Drive Protecting Circuit, which is characterized in that including ac power input end, EMC filter circuit, rectification circuit,
Control chip, transformer, switching tube, first diode, the second diode, zener diode, overvoltage protection resistance, overcurrent protection
Resistance, the transformer include armature winding, biasing winding and secondary windings；
The power input of the EMC filter circuit is connect with the ac power input end, the power supply of the EMC filter circuit
Output end is connect with the power input of the rectification circuit, power output end anode, the control core of the rectification circuit
The interconnection of the first end of the power end of piece and the armature winding, the power output end cathode ground connection of the rectification circuit are described first
The second end of grade winding is connect with the input terminal of the switching tube, the control of the controlled end of the switching tube and the control chip
End connection, the output end of the switching tube, the control voltage detection terminal of chip, the first end of the overvoltage protection resistance and
The first end of the overcurrent protection resistance interconnects, and the first end of the biasing winding and the anode of first diode connect, described
The cathode of first diode is connect with the cathode of the zener diode, anode and the overvoltage protection of the zener diode
The second end of resistance connects, and the biasing winding and the overcurrent protection resistance are grounded, the first end of the secondary windings and
The second diode connection, second diode are connect with the power input of the LED, and the second of the secondary windings
Section ground connection；
The EMC filter circuit, for being filtered to the AC power source of input and electromagnetism is anti-interference；
The rectification circuit for rectifying to the AC power source, and exports the first DC power supply to the control chip
With the armature winding；
The secondary windings for coupling with the armature winding, and exports the second DC power supply to the LED；
The biasing winding for coupling with the secondary windings, and exports third DC power supply to the control chip；
The zener diode for being connected when the voltage of the biasing winding rises and is greater than conducting voltage, and exports electricity
It flow to the overcurrent protection resistance；
The overvoltage protection resistance, for carrying out current limliting to the electric current for flowing through the zener diode；
The control chip, for according to the corresponding output pwm control signal control of the end voltage of the overcurrent protection resistance
Switching tube work, and when the end voltage of the overcurrent protection resistance is greater than predeterminated voltage, output switch control signal control
The switching tube shutdown.
2. LED Drive Protecting Circuit as described in claim 1, which is characterized in that the EMC filter circuit includes the first electricity
Appearance, first resistor and the first choking-winding；
The both ends of the first capacitor, the first resistor both ends be correspondingly connected with respectively with the ac power input end, institute
Ac power input end is stated also to connect through first choking-winding with the power input of the rectification circuit.
3. LED Drive Protecting Circuit as described in claim 1, which is characterized in that rectification circuit protection rectifier bridge and the
Two capacitors；
The power input of the rectifier bridge is the power input of the rectification circuit, the power output end point of the rectifier bridge
Both ends not with second capacitor are correspondingly connected with.
4. LED Drive Protecting Circuit as described in claim 1, which is characterized in that the LED Drive Protecting Circuit further includes using
In the feed circuit for feeding back the LED Drive Protecting Circuit output voltage；
First signal end of the feed circuit is connect with the output end of the secondary windings, the second signal of the feed circuit
It holds and is connect with the feedback signal terminal of the control chip.
5. LED Drive Protecting Circuit as claimed in claim 4, which is characterized in that the feed circuit includes second resistance,
Three resistance, the 4th resistance, the 5th resistance, photoelectrical coupler, voltage-stablizer and third capacitor；
The first end of the first end of the second resistance, the first end of the 3rd resistor and the secondary windings interconnects, described
The first end of the second end of second resistance, the first end of the photoelectrical coupler and the 4th resistance connects, the 4th electricity
The second end of resistance, the second end of the photoelectrical coupler, the input terminal of the first end of the third capacitor and the voltage-stablizer are mutual
Even, the second end of the 3rd resistor, the second end of the third capacitor, the first end of the 5th resistance and the voltage-stablizer
Output end interconnection, the second end of the ground terminal of the voltage-stablizer and the 5th resistance is grounded.
6. LED Drive Protecting Circuit as described in claim 1, which is characterized in that the LED Drive Protecting Circuit further includes using
In the first absorption circuit for carrying out voltage protection to the first diode, the first absorption circuit includes the 6th resistance and the 4th electricity
Hold；
The first end connection of the first end, the positive and described biasing winding of the first diode of 6th resistance, it is described
The second end of 6th resistance is connect with the first end of the 4th capacitor, the second end of the 4th capacitor, the one or two pole
The power end connection of the cathode of pipe, the cathode of the zener diode and the control chip.
7. LED Drive Protecting Circuit as described in claim 1, which is characterized in that the LED Drive Protecting Circuit further includes
Seven resistance, the first end of the 7th resistance are connect with the voltage detection terminal of the control chip, and the second of the 7th resistance
End is connect with the first end of the overcurrent protection resistance.
8. LED Drive Protecting Circuit as described in claim 1, which is characterized in that the LED Drive Protecting Circuit further includes
Eight resistance and third diode, the first end of the 8th resistance, the cathode of the third diode and the control chip
Control terminal interconnection, the second end of positive, described 8th resistance of the third diode and the controlled end interconnection of the switching tube.
9. LED Drive Protecting Circuit as described in claim 1, which is characterized in that the LED Drive Protecting Circuit further includes using
In to the switching tube carry out voltage protection the second absorption circuit, the absorption circuit include the 9th resistance, the 5th capacitor and
4th diode；
The power output end anode of the first end of 9th resistance, the first end of the 5th capacitor and the rectification circuit is mutually
Even, the cathode of the second end of the 9th resistance, the second end of the 5th capacitor and the 4th diode connection, described the
The anode of four diodes is connect with the input terminal of the switching tube.
10. LED Drive Protecting Circuit as described in claim 1, which is characterized in that the LED Drive Protecting Circuit further includes
For carrying out the third absorption circuit of voltage protection to output to second diode, the third absorption circuit includes the
Six capacitors and the tenth resistance；
The anode of the first end of 6th capacitor and second diode is connect, the second end of the 6th capacitor with it is described
The first end of tenth resistance connects, and the second end of the tenth resistance is connect with the cathode of second diode.
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| CN201822229119.2U CN209627761U (en) | 2018-12-27 | 2018-12-27 | LED Drive Protecting Circuit |
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| CN201822229119.2U CN209627761U (en) | 2018-12-27 | 2018-12-27 | LED Drive Protecting Circuit |
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| CN209627761U true CN209627761U (en) | 2019-11-12 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111065189A (en) * | 2019-12-16 | 2020-04-24 | 华帝股份有限公司 | LED linear constant current circuit with overvoltage detection function and overvoltage detection method |
| CN111697654A (en) * | 2020-06-18 | 2020-09-22 | 上海摩勤智能技术有限公司 | Charging circuit capable of blind identification of positive and negative insertion and wearable equipment |
| CN113904305A (en) * | 2021-11-10 | 2022-01-07 | 茂硕电源科技股份有限公司 | Temperature protection circuit of switching power supply |
| CN114825907A (en) * | 2022-04-12 | 2022-07-29 | 湖南国科微电子股份有限公司 | Voltage-withstanding protection bias circuit and chip power supply circuit |
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2018
- 2018-12-27 CN CN201822229119.2U patent/CN209627761U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111065189A (en) * | 2019-12-16 | 2020-04-24 | 华帝股份有限公司 | LED linear constant current circuit with overvoltage detection function and overvoltage detection method |
| CN111065189B (en) * | 2019-12-16 | 2022-04-26 | 华帝股份有限公司 | LED linear constant current circuit with overvoltage detection function and overvoltage detection method |
| CN111697654A (en) * | 2020-06-18 | 2020-09-22 | 上海摩勤智能技术有限公司 | Charging circuit capable of blind identification of positive and negative insertion and wearable equipment |
| CN111697654B (en) * | 2020-06-18 | 2023-12-29 | 上海摩勤智能技术有限公司 | Charging circuit for blind identification positive and negative insertion and wearable equipment |
| CN113904305A (en) * | 2021-11-10 | 2022-01-07 | 茂硕电源科技股份有限公司 | Temperature protection circuit of switching power supply |
| CN113904305B (en) * | 2021-11-10 | 2024-01-23 | 茂硕电源科技股份有限公司 | Temperature protection circuit of switching power supply |
| CN114825907A (en) * | 2022-04-12 | 2022-07-29 | 湖南国科微电子股份有限公司 | Voltage-withstanding protection bias circuit and chip power supply circuit |
| CN114825907B (en) * | 2022-04-12 | 2024-06-04 | 湖南国科微电子股份有限公司 | Withstand voltage protection bias circuit and chip power supply circuit |
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Address after: 518000 1402, 1403, Building 1, Huide Building, Beizhan Community, Minzhi Street, Longhua District, Shenzhen, Guangdong Province (an enterprise with one license and multiple addresses) Patentee after: Shenzhen yuehongpu Intelligent Photoelectric Technology Co.,Ltd. Address before: 518000 second and fifth floors, building B, Jinhao entrepreneurship Park, No. 9, Dafu Industrial Zone, Aobei community, Guanlan street, Longhua new area, Shenzhen, Guangdong Patentee before: SHENZHEN STEP ELECTRONIC AND LIGHTING Co.,Ltd. |
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