CN208572509U - A kind of LED drive circuit of low electromagnetic - Google Patents
A kind of LED drive circuit of low electromagnetic Download PDFInfo
- Publication number
- CN208572509U CN208572509U CN201821260397.8U CN201821260397U CN208572509U CN 208572509 U CN208572509 U CN 208572509U CN 201821260397 U CN201821260397 U CN 201821260397U CN 208572509 U CN208572509 U CN 208572509U
- Authority
- CN
- China
- Prior art keywords
- capacitor
- inductance
- led
- circuit
- connect
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Led Devices (AREA)
Abstract
The utility model discloses a kind of LED drive circuits of low electromagnetic, comprising: input stage circuit, for accessing power supply；Constant current driver circuit for LED, for being exported after carrying out boost or depressurization to the supply voltage of access；Output-stage circuit, voltage output for exporting constant current driver circuit for LED to LED；The input stage circuit is connect by constant current driver circuit for LED with output-stage circuit；The constant current driver circuit for LED is equipped with electro-magnetic shielding cover.The LED drive circuit of the utility model can carry out voltage lifting/lowering processing, applicable compatibility is higher, meet the actual use situation of LED driving, and be provided with electro-magnetic shielding cover in the constant current driver circuit for LED for being also easy to produce high electromagnetic radiation, the EMC for improving LED drive circuit can be optimized.A kind of LED drive circuit of low electromagnetic of the utility model can be widely applied in LED field.
Description
Technical field
The utility model relates to LED actuation techniques more particularly to a kind of LED drive circuits of low electromagnetic.
Background technique
LED solid-state lighting is referred to as a new generation's illumination revolution, is that this century various countries give priority to one of target.In vapour
In the various different fields such as vehicle, motorcycle, emergency, LED illumination is with its performance characteristics advantage outstanding, if energy-saving effect is high, by
Gradually illuminated instead of traditional fever filament.
In LED development process, LED drive power is played a very important role, and according to incompletely statistics, there is 80%
LED light failure is due to caused by power circuit problem.Currently, in LED drive power problem, electromagnetic compatibility (Electro
Magnetic Compatibility) property is to enable one of numerous designers the most headache, particularly with intelligence/automation
The equipment (such as automobile) of type would generally be equipped with many sensors and IC, therefore its EMC to built-in LED drive power
It is required that can be some higher.And electricity and magnetic are a kind of indivisible, physical phenomenon/physical environments for mutually coexisting, it may be said that there is electricity
Place will generate electromagnetic radiation, our ambient enviroments are also among various electromagnetic radiation surround, thus in order to
The Electro Magnetic Compatibility of circuit is improved to guarantee the safety of circuit work, on the one hand needs to reduce circuit in normal course of operation
On the other hand the electromagnetic interference generated to place environment then needs to improve circuit to existing in environment no more than certain limit value
Electromagnetism noise immunity.However current LED drive power can't meet these requirements well.
In addition, for relying on battery powered LED light, the voltage of battery output can be got over the increase for using the time
Come it is smaller, if merely setting reduction voltage circuit come for LED power supply, drive LED operation, then easily cause LED driving it is unstable, and
In most cases, input voltage is higher than output voltage, then merely being driven using booster circuit as LED, is not also inconsistent
Close practical situations.As it can be seen that there is no the circuit structure that boosting and decompression can be achieved simultaneously in current LED drive circuit,
It is low to be applicable in compatibility.
Utility model content
In order to solve the above-mentioned technical problem, the purpose of the utility model is to provide a kind of LED of low electromagnetic driving electricity
Road, Electro Magnetic Compatibility is high, and can realize boosting output and reduced output voltage.
The technical scheme adopted by the utility model is a kind of LED drive circuit of low electromagnetic, comprising:
Input stage circuit, for accessing power supply；
Constant current driver circuit for LED, for being exported after carrying out boost or depressurization to the supply voltage of access；
Output-stage circuit, voltage output for exporting constant current driver circuit for LED to LED；
The input stage circuit is connect by constant current driver circuit for LED with output-stage circuit；The constant current driver circuit for LED
It is equipped with electro-magnetic shielding cover.
Further, the constant current driver circuit for LED includes main control chip, the 4th inductance, the 5th capacitor, the 5th inductance,
One metal-oxide-semiconductor and the second diode, the control port of the main control chip are connect with the grid of the first metal-oxide-semiconductor, the first MOS
The drain electrode of pipe is connect with one end of one end of the 4th inductance and the 5th capacitor respectively, and the other end of the 5th capacitor is respectively with
The anode connection of one end of five inductance and the second diode, the source electrode of first metal-oxide-semiconductor are connect with the cathode of the second diode；
The other end of 4th inductance and the source electrode of the first metal-oxide-semiconductor are connect with input stage circuit, the other end of the 5th inductance
It is connect with output-stage circuit with the cathode of the second diode.
Further, the constant current driver circuit for LED further includes second resistance, and the second resistance is connected to main control chip
Between control port and the grid of the first metal-oxide-semiconductor.
Further, magnetic bead is equipped at the control port of the main control chip and/or at the PWM port of main control chip.
Further, the constant current driver circuit for LED further includes the 4th capacitor and 3rd resistor, one end of the 4th capacitor
It is connect with the drain electrode of the first metal-oxide-semiconductor, the other end of the 4th capacitor and one end of 3rd resistor connect, the 3rd resistor
The other end is connect with the anode of the second diode.
Further, the constant current driver circuit for LED further include first resistor, the 4th resistance, the 5th resistance, the 6th resistance,
7th resistance, the 6th capacitor, the 7th capacitor, the 8th capacitor and third zener diode；
One end of the first resistor, the port GND of main control chip, one end of the 6th capacitor and one end of the 7th capacitor
It is connect with the source electrode of the first metal-oxide-semiconductor, the other end of the first resistor is connect with one end of the 4th resistance, the 4th resistance
The other end connect respectively with the port REF of main control chip, the other end of the 7th capacitor and one end of the 5th resistance, the described 5th
The other end of resistance is connect with one end of the port CS2 of main control chip and the 6th resistance respectively, the other end of the 6th resistance
It is connect respectively with one end of the cathode of third zener diode and the 7th resistance, the other end and the 8th capacitor of the 7th resistance
One end connection, the third zener diode anode and the 8th capacitor the other end with the other end of the 5th inductance company
It connects；The other end of 6th capacitor and the vdd terminal mouth of main control chip connect, the port Vin of the main control chip and the 4th electricity
One end of sense connects.
Further, the input stage circuit includes the first filter circuit and/or the output-stage circuit includes the second filtering
Circuit.
Further, first filter circuit include first capacitor, the first common mode inductance, the second capacitor, third inductance with
And third capacitor, it include the first inductance and the second inductance in first common mode inductance；One end of the first capacitor and first
One end of inductance connects, and the other end of first inductance is connect with one end of one end of the second capacitor and third inductance respectively,
The other end of the third inductance is connect with one end of third capacitor, the other end of the third capacitor and the second capacitor it is another
End is connect with one end of the second inductance, and the other end of second inductance and the other end of first capacitor connect；The third
The both ends of capacitor are connect with constant current driver circuit for LED；
Second filter circuit includes the 9th capacitor, the tenth capacitor, the 11st capacitor and the second common mode inductance, described
Second common mode inductance includes the 6th inductance and the 7th inductance；One end of 9th capacitor is connect with one end of the 6th inductance, institute
The other end for stating the 6th inductance is connect with one end of the 11st capacitor, and one end of the tenth capacitor and one end of the 7th inductance connect
It connects, the other end of the 7th inductance is connect with the other end of the 11st capacitor, the other end of the 9th capacitor and the tenth electricity
The other end of appearance is grounded；One end of 9th capacitor and one end of the tenth capacitor are connect with constant current driver circuit for LED.
Further, the input stage circuit further includes first diode and fuse, one end of the fuse and first
The anode connection of diode, the cathode of the first diode are connect with the input terminal of the first filter circuit.
It further, further include having pcb board, the pcb board includes component lines layer, and the lower surface of the component lines layer is set
There is ground wire layers of copper；The input stage circuit, constant current driver circuit for LED and/or output-stage circuit are arranged on component lines layer.
The beneficial effects of the utility model are: the LED drive circuit of the utility model includes for accessing the defeated of power supply
Enter a grade circuit, for carrying out the constant current driver circuit for LED exported after boost or depressurization to the supply voltage of access and for inciting somebody to action
Constant current driver circuit for LED output voltage output to LED output-stage circuit, the input stage circuit by LED constant current driving
Circuit is connect with output-stage circuit；The constant current driver circuit for LED is equipped with electro-magnetic shielding cover, therefore it can be seen that this is practical
Novel LED drive circuit can carry out voltage lifting/lowering processing, and the LED of reduction voltage circuit or booster circuit is only arranged compared to tradition
Driving circuit, the applicable compatibility of this LED drive circuit is higher, meets the actual use situation of LED driving, and is being also easy to produce height
It is provided with electro-magnetic shielding cover in the constant current driver circuit for LED of electromagnetic radiation, the EMC for improving LED drive circuit can be optimized.
Detailed description of the invention
Fig. 1 is an a kind of specific embodiment circuit diagram of LED drive circuit of low electromagnetic of the utility model；
Fig. 2 is that circuit operation principle when a kind of LED drive circuit of low electromagnetic of the utility model is boosted is shown
It is intended to；
Fig. 3 is that circuit operation principle when a kind of LED drive circuit of low electromagnetic of the utility model is depressured is shown
It is intended to.
Specific embodiment
The utility model is described in further detail with preferred embodiment with reference to the accompanying drawing.
Buck processing, the utility model can be achieved in order to improve the EMC performance of LED drive circuit and LED be enabled to drive
Embodiment provides a kind of LED drive circuit of low electromagnetic, comprising:
Input stage circuit, for accessing power supply；
Constant current driver circuit for LED, for being exported after carrying out boost or depressurization to the supply voltage of access；
Output-stage circuit, the voltage output for exporting constant current driver circuit for LED is to LED, to drive LED operation；
The input stage circuit is connect by constant current driver circuit for LED with output-stage circuit；The constant current driver circuit for LED
It is equipped with electro-magnetic shielding cover.
As shown in Figure 1, preferably including main control chip U1, the 4th inductance L4, for above-mentioned constant current driver circuit for LED
Five capacitor C5, the 5th inductance L5, the first metal-oxide-semiconductor M1 and the second diode D2, the control port GATE of the main control chip U1
Connect with the grid of the first metal-oxide-semiconductor M1, the first metal-oxide-semiconductor M1 drain electrode respectively with one end of the 4th inductance L4 and the 5th capacitor
One end of C5 connects, the other end of the 5th capacitor C5 anode with one end of the 5th inductance L5 and the second diode D2 respectively
Connection, the source electrode of the first metal-oxide-semiconductor M1 are connect with the cathode of the second diode D2；The other end of the 4th inductance L4 and
The source electrode of one metal-oxide-semiconductor M1 is connect with input stage circuit, and the other end of the 5th inductance L5 and the cathode of the second diode are equal
It is connect with output-stage circuit.
For above-mentioned constant current driver circuit for LED, the course of work are as follows: when U1 exports control signal, and M1 is enabled to be connected, LED is driven
The performance loop of dynamic circuit as shown in Fig. 2, the electric current of inductance L4 and L5 increases at this time, boost by realization；When U1 exports control letter
When command M1 cut-off (closing), the performance loop of LED drive circuit is as shown in figure 3, the electric current of inductance L4 and L5 subtracts at this time
It is few, it realizes decompression, is either less than output voltage regardless of input voltage is greater than in this way, can stablize and export constant electric current.And
It can be seen that the conversion of energy is realized by capacitor C5 during from this, the big advantage of one is can to enable input stage and output stage
Between be isolation, the Damage by Short Circuit of MOSFET pipe M1 will not influence rear class element, this is also one of big advantage of this circuit.
In a preferred embodiment, the main control chip U1 is realized using the control chip of model HV9930.
In a preferred embodiment, the constant current driver circuit for LED further includes second resistance R2, and the second resistance R2 connects
It connects between the grid of the control port GATE and the first metal-oxide-semiconductor M1 of main control chip U1.Specifically, the one of the second resistance R2
End is connect with control port GATE, the grid connection of the other end and M1；There is a resistance R2 by the grid string in M1, this electricity
Resistance can form a RC circuit with grid capacitance, then can increase the grid signal rise time in this way, make to reduce peak voltage
At burst radiation.
In a preferred embodiment, at the control port GATE of the main control chip U1 and/or end PWM of main control chip U1
Magnetic bead (alternatively referred to as magnet ring) is equipped at mouthful.Specifically, the MOSFET pipe of the PWM dim signal of control chip U1 access and output
Driving high-frequency signal be also generate electromagnetic radiation a big arch-criminal, in order to reduce signal radiation caused by it, then close
The place string of chip has magnet ring, i.e., the first magnetic bead 1 is arranged at control port GATE, can cover and be arranged in control port GATE
On connecting line between the grid of M1, and should be as close to U1, and the second magnetic bead 2 is set at PWM port, it can cover
It is arranged on the connecting line between PWM port and pwm signal output equipment, and should be as close to U1.
In a preferred embodiment, the constant current driver circuit for LED further includes the 4th capacitor C4 and 3rd resistor R3, described
One end of 4th capacitor C4 is connect with the drain electrode of the first metal-oxide-semiconductor M1, and the other end of the 4th capacitor C4 is with 3rd resistor R3's
One end connection, the other end of the 3rd resistor R3 are connect with the anode of the second diode D2.
In a preferred embodiment, the constant current driver circuit for LED further includes first resistor R1, the 4th resistance R4, the 5th
Resistance R5, the 6th resistance R6, the 7th resistance R7, the 6th capacitor C6, the 7th capacitor C7, the 8th capacitor C8 and third zener diode
D3；
One end of the first resistor R1, the port GND of main control chip U1, one end of the 6th capacitor C6 and the 7th capacitor
One end of C7 is connect with the source electrode of the first metal-oxide-semiconductor M1, and the other end of the first resistor R1 and one end of the 4th resistance R4 connect
It connects, the other end of the 4th resistance R4 is electric with the port REF of main control chip U1, the other end of the 7th capacitor C1 and the 5th respectively
Hinder one end connection of R5, the other end of the 5th resistance R5 respectively with the port CS2 of main control chip U1 and the 6th resistance R6
One end connection, the other end of the 6th resistance R6 one end with the cathode of third zener diode D3 and the 7th resistance R7 respectively
Connection, the other end of the 7th resistance R7 are connect with one end of the 8th capacitor C8, the anode of the third zener diode D3
It is connect with the other end of the 5th inductance L5 with the other end of the 8th capacitor C8；The other end and master control core of the 6th capacitor C6
The vdd terminal mouth of piece U1 connects, and the port Vin of the main control chip U1 is connect with one end of the 4th inductance L4.Wherein, R4 and R5 is used
The size of output electric current can be changed by changing the resistance value size of R4, R5 in the adjustment of output electric current；C8 is in this circuit arrangement
Play filter effect.
In a preferred embodiment, can be seen that from the structure of above-mentioned constant current driver circuit for LED, element U1, R2, M1, L4,
C5, C4, R3, L5, D2, D3, C6, C7, R6 etc. are high-frequency signal element, because in order to shield radiation caused by them, then institute
It states on these elements that electro-magnetic shielding cover should be specifically covered in constant current driver circuit for LED.Specifically dotted line frame institute as shown in figure 1
Show, is preferably the coverage area of electro-magnetic shielding cover.
For the input stage circuit, the first filter circuit is preferably included, and/or for the output-stage circuit,
Preferably include the second filter circuit.
In a preferred embodiment, first filter circuit includes first capacitor C1, the first common mode inductance, the second capacitor
C2, third inductance L3 and third capacitor C3 include the first inductance L1 and the second inductance L2 in first common mode inductance；It is described
One end of first capacitor C1 is connect with one end of the first inductance L1, the other end of the first inductance L1 respectively with the second capacitor C2
One end connected with one end of third inductance L3, the other end of the third inductance L3 is connect with one end of third capacitor C3, institute
The other end of the other end and the second capacitor C2 of stating third capacitor C3 is connect with one end of the second inductance L2, second inductance
The other end of L2 is connect with the other end of first capacitor C1；The both ends of the third capacitor C3 are connect with constant current driver circuit for LED；
Specifically, the other end of one end of C3 and L4 connect, and the other end of C3 and the source electrode of M1 connect.
Wherein, it is parallel with C1 in DC voltage incoming end, high-frequency harmonic can be filtered, improve the reliability of circuit work；
And C1 is preferably a 10nF high-frequency ceramic filter capacitor, can effectively further filter high-frequency harmonic in this way；In this reality
It applies in example, the other end connection negative voltage side V- of one end connection positive voltage terminal V+ (accessing the anode of power supply) of C1, C1 (connect
Enter the cathode of power supply)；
Further, since spuious coupling common-mode signal can be generated between driving circuit and ground, therefore preferably make pottery in high frequency
The first common mode inductance is connected in parallel after porcelain filter capacitor to inhibit this signal；And for the first common mode inductance, included
First inductance L1 and the second inductance L2, they are wound on the same iron core, and the number of turns and phase are all identical (coiling is reversed), because
This, when the normal current in circuit flows through the first common mode inductance, electric current is anti-because generating in the inductance coil of same-phase coiling
To magnetic field and cancel out each other, normal signal electric current is mainly influenced by coil resistance (and on a small quantity because hindering caused by leakage inductance at this time
Buddhist nun), when there is common mode current flowing through coil, due to the same tropism of common mode current, magnetic field in the same direction can be generated in coil and is increased
The induction reactance of big coil, makes coil show as high impedance, generates stronger damping, with this attenuation common-mode electric current, reach filtering
Purpose.As it can be seen that the filter circuit of the input stage of the present embodiment can substantially eliminate the clutter line of input terminal.
In a preferred embodiment, second filter circuit includes the 9th capacitor C9, the tenth capacitor C10, the 11st electricity
Hold C11 and the second common mode inductance, second common mode inductance includes the 6th inductance L6 and the 7th inductance L7；9th capacitor
One end of C9 is connect with one end of the 6th inductance L6, and the other end of the 6th inductance L6 and one end of the 11st capacitor C11 connect
It connects, one end of the tenth capacitor C10 is connect with one end of the 7th inductance L7, the other end and the 11st of the 7th inductance L7
The other end of capacitor C11 connects, and the other end of the 9th capacitor C9 and the other end of the tenth capacitor C10 are grounded；Described
One end of nine capacitor C9 and one end of the tenth capacitor C10 are connect with constant current driver circuit for LED, and the both ends of C11 and load LED connect
It connects, the load LED includes several LED, and several LED are connected in series；Specifically, the other end of one end of C9 and L5 connect
It connects, one end of C10 and the cathode of D2 connect.As it can be seen that in the present embodiment, the filter circuit of output stage is by C9, C10, C11 and altogether
Mould inductance L6, L7 composition, wherein it is miscellaneous that common mode inductance L6, L7 and capacitor C11 mainly eliminate the common mode generated between LED and ground
Coupled signal is dissipated, and C9 and C10 then mainly eliminate high-frequency interferencing signal caused by metal-oxide-semiconductor M1, greatly reduce load and are produced
Raw electromagnetic interference further increases the EMC performance of circuit.
In a preferred embodiment, the input stage circuit further includes first diode D1 and fuse F1, the insurance
One end of silk F1 is connect with the anode of first diode D1, the input of the cathode and the first filter circuit of the first diode D1
End connection.Specifically, one end of the cathode of D1 and L1 connect.Since the anode in input terminal is in series with self-recovering function fuse
The diode D1 of F1 and anti-reverse positive and negative anodes, the so reversed cut-off when access power supply is reversed due to diode D1 are acted on, instead
It can be prevented from accessing to DC power supply；Equally, fuse F1 can disconnect power supply when a short circuit occurs, and when Failure elimination electric current is extensive
Fuse F1 can work normally access power supply when multiple.It can be seen that by setting D1 and F1, and they are connected in series in input terminal
Anode, can further improve the safety of this circuit work in this way, and greatly reduces and lead to member because of circuit malfunctions
The case where device failure.In addition, D1 can also prevent the C1 electric discharge when chip is closed from generating malfunction.
It in a preferred embodiment, further include having pcb board, the pcb board includes component lines layer, the component lines layer
Lower surface be equipped with ground wire layers of copper；The input stage circuit, constant current driver circuit for LED and/or output-stage circuit are arranged in element
On line layer.In order to further shield radiation signal caused by high-frequency signal element as much as possible, in above-mentioned high-frequency signal member
On the basis of electro-magnetic shielding cover is posted on the surface of part, one is laid to the lower surface of the component lines layer in the pcb board of multilayered structure
Set electro-magnetic shielding cover then forms the anti-electromagnetism spoke an of opposing seal in ground wire layers of copper, in this way the ground wire layers of copper and element
Cover is penetrated, the electromagnetic radiation of circuit is further reduced, and lays a ground wire layers of copper to be conducive to heat dissipation for circuit board.
In a preferred embodiment, the main control chip controls M1 using Hysteresis control mode, to realize constant current output.
As it can be seen that the advantages of LED drive circuit of the utility model specifically includes has:
1, the constant current driver circuit for LED in this LED drive circuit can carry out decompression processing to input voltage, can also be risen
It is exported after pressure processing, that is to say, that the input voltage of this LED drive circuit can be higher than or be lower than output voltage, it is seen then that
Constant current driver circuit for LED be one have boosting and buck configuration circuit, in this way compared to tradition only be arranged reduction voltage circuit or
The LED drive circuit of booster circuit, the applicable compatibility of this LED drive circuit is higher, and using flexible is higher, meets LED driving
Actual use situation；
2, this circuit is started with from circuit structure, element, PCB layout etc. to improve the EMC of entire LED drive module
Can, the injury of Radiation On Human body can not only be greatly reduced, and the safety that electronic equipment uses can also be improved；In addition, by
There is high EMC in this LED drive circuit, therefore, the harsh application scenarios such as automobile can be met to the EMC of LED drive circuit
It is required that；
3, the capacitor C1 employed in this circuit is also the isolation of input and output while as energy conversion component
Element；Input circuit can be made short-circuit when the first metal-oxide-semiconductor M1 as switch damages breakdown, fuse disconnects protecting output
Hold it is unaffected, enable main control chip will not by overcurrent punch through damage, achieve the effect that protect main control chip, further mention
The safety of high circuit, and reduce circuit damage probability；In addition, two that two inductance form in circuit are returned routing capacitance C1
It separates, such Inport And Outport Node circuit does not influence each other to further reduce the harmonic wave interference radiation of circuit；
4, two energy conversions inductance L1 and L2 are wound on the same iron core, and inductance ripple current can pass completely from side
Be sent to the other side, due to two winding directions on the contrary, thus caused by ripple electromagnetic interference be reduced at least, so as into one
Step improves the EMC performance of circuit；
5, main control chip controls M1 using Hysteresis control mode, and to realize constant current output, this is with real-time control, response
Speed is fast, is easily achieved, the feature that stability and mapping are good；It is by switch function for the Hysteresis control mode
The output of computing module is connected to hysteresis comparator to generate control pulse, with the on-off shape of control switch MOSFET pipe (i.e. M1)
State, to realize step-up/down；
6, since control chip HV9930 heat-resisting quantity is strong, chip can reduce output electric current automatically to protect when the temperature is excessively high
Circuit safety is demonstrate,proved, therefore, this LED drive circuit is particularly suitable in the scape of the high-temperature fields such as automobile, motorcycle.
It is to be illustrated to the preferable implementation of the utility model, but the invention is not limited to the reality above
Example is applied, those skilled in the art can also make various equivalent changes without departing from the spirit of the present invention
Shape or replacement, these equivalent deformations or replacement are all included in the scope defined by the claims of the present application.
Claims (10)
1. a kind of LED drive circuit of low electromagnetic characterized by comprising
Input stage circuit, for accessing power supply；
Constant current driver circuit for LED, for being exported after carrying out boost or depressurization to the supply voltage of access；
Output-stage circuit, voltage output for exporting constant current driver circuit for LED to LED；
The input stage circuit is connect by constant current driver circuit for LED with output-stage circuit；It is set in the constant current driver circuit for LED
There is electro-magnetic shielding cover.
2. a kind of LED drive circuit of low electromagnetic according to claim 1, which is characterized in that the LED constant current driving
Circuit includes main control chip, the 4th inductance, the 5th capacitor, the 5th inductance, the first metal-oxide-semiconductor and the second diode, the master control
The control port of chip is connect with the grid of the first metal-oxide-semiconductor, first metal-oxide-semiconductor drain electrode respectively with one end of the 4th inductance and
One end of 5th capacitor connects, the other end of the 5th capacitor anode with one end of the 5th inductance and the second diode respectively
Connection, the source electrode of first metal-oxide-semiconductor are connect with the cathode of the second diode；The other end and the first MOS of 4th inductance
The source electrode of pipe is connect with input stage circuit, and the other end of the 5th inductance and the cathode of the second diode are electric with output stage
Road connection.
3. a kind of LED drive circuit of low electromagnetic according to claim 2, which is characterized in that the LED constant current driving
Circuit further includes second resistance, and the second resistance is connected between the control port of main control chip and the grid of the first metal-oxide-semiconductor.
4. a kind of LED drive circuit of low electromagnetic according to claim 2, which is characterized in that the main control chip
Magnetic bead is equipped at control port and/or at the PWM port of main control chip.
5. a kind of LED drive circuit of low electromagnetic according to claim 2, which is characterized in that the LED constant current driving
Circuit further includes the 4th capacitor and 3rd resistor, and one end of the 4th capacitor is connect with the drain electrode of the first metal-oxide-semiconductor, and the described 4th
The other end of capacitor and one end of 3rd resistor connect, and the other end of the 3rd resistor is connect with the anode of the second diode.
6. a kind of LED drive circuit of low electromagnetic according to claim 2, which is characterized in that the LED constant current driving
Circuit further includes first resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 6th capacitor, the 7th capacitor, the 8th
Capacitor and third zener diode；
One end of the first resistor, the port GND of main control chip, one end of the 6th capacitor and the 7th capacitor one end with
The source electrode of first metal-oxide-semiconductor connects, and the other end of the first resistor is connect with one end of the 4th resistance, the 4th resistance it is another
One end is connect with the port REF of main control chip, the other end of the 7th capacitor and one end of the 5th resistance respectively, the 5th resistance
The other end connect respectively with one end of the port CS2 of main control chip and the 6th resistance, the other end of the 6th resistance difference
It is connect with one end of the cathode of third zener diode and the 7th resistance, the one of the other end of the 7th resistance and the 8th capacitor
End connection, the anode of the third zener diode and the other end of the 8th capacitor are connect with the other end of the 5th inductance；Institute
The vdd terminal mouth of the other end and main control chip of stating the 6th capacitor connects, the port Vin of the main control chip and the one of the 4th inductance
End connection.
7. any one of -6 a kind of LED drive circuit of low electromagnetic according to claim 1, which is characterized in that described defeated
Entering grade circuit includes that the first filter circuit and/or the output-stage circuit include the second filter circuit.
8. a kind of LED drive circuit of low electromagnetic according to claim 7, which is characterized in that first filtered electrical
Road includes first capacitor, the first common mode inductance, the second capacitor, third inductance and third capacitor, in first common mode inductance
Include the first inductance and the second inductance；One end of the first capacitor is connect with one end of the first inductance, first inductance
The other end is connect with one end of one end of the second capacitor and third inductance respectively, the other end and third capacitor of the third inductance
One end connection, the other end of the third capacitor and the other end of the second capacitor are connect with one end of the second inductance, described
The other end of second inductance and the other end of first capacitor connect；The both ends of the third capacitor and constant current driver circuit for LED connect
It connects；
Second filter circuit include the 9th capacitor, the tenth capacitor, the 11st capacitor and the second common mode inductance, described second
Common mode inductance includes the 6th inductance and the 7th inductance；One end of 9th capacitor is connect with one end of the 6th inductance, and described
The other end of six inductance is connect with one end of the 11st capacitor, and one end of the tenth capacitor is connect with one end of the 7th inductance,
The other end of 7th inductance is connect with the other end of the 11st capacitor, the other end of the 9th capacitor and the tenth capacitor
The other end is grounded；One end of 9th capacitor and one end of the tenth capacitor are connect with constant current driver circuit for LED.
9. a kind of LED drive circuit of low electromagnetic according to claim 7, which is characterized in that the input stage circuit
It further include first diode and fuse, one end of the fuse and the anode of first diode connect, the one or two pole
The cathode of pipe is connect with the input terminal of the first filter circuit.
10. any one of -6 a kind of LED drive circuit of low electromagnetic according to claim 1, which is characterized in that further include
There is pcb board, the pcb board includes component lines layer, and the lower surface of the component lines layer is equipped with ground wire layers of copper；The input stage
Circuit, constant current driver circuit for LED and/or output-stage circuit are arranged on component lines layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821260397.8U CN208572509U (en) | 2018-08-06 | 2018-08-06 | A kind of LED drive circuit of low electromagnetic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821260397.8U CN208572509U (en) | 2018-08-06 | 2018-08-06 | A kind of LED drive circuit of low electromagnetic |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208572509U true CN208572509U (en) | 2019-03-01 |
Family
ID=65449869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821260397.8U Active CN208572509U (en) | 2018-08-06 | 2018-08-06 | A kind of LED drive circuit of low electromagnetic |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208572509U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109041343A (en) * | 2018-08-06 | 2018-12-18 | 广东德洛斯照明工业有限公司 | A kind of LED drive circuit of low electromagnetic |
-
2018
- 2018-08-06 CN CN201821260397.8U patent/CN208572509U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109041343A (en) * | 2018-08-06 | 2018-12-18 | 广东德洛斯照明工业有限公司 | A kind of LED drive circuit of low electromagnetic |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104235785A (en) | LED (Light Emitting Diode) fluorescent lamp drive power source and LED fluorescent lamp | |
| CN201405807Y (en) | Power supply circuit for whole vehicle controller of hybrid power bus | |
| CN102931182B (en) | The packaging system of the single-phase integrated drive electronics of compact and single-phase integrated drive electronics | |
| EP3320610A1 (en) | High power density inverter (i) | |
| CN201986215U (en) | High-power light emitting diode (LED) isolation type driving power supply | |
| CN208572509U (en) | A kind of LED drive circuit of low electromagnetic | |
| CN112512180A (en) | DMX512 control circuit capable of meeting EMC requirements | |
| CN209233717U (en) | A kind of EMC filter circuit | |
| CN201054848Y (en) | Electromagnetic interference restraint device, electronic ballast system and compact energy-saving lamp | |
| CN101610027B (en) | Electromagnetic interference suppression circuit for correcting power factor | |
| CN203757403U (en) | LED (Light Emitting Diode) candle lamp with incandescent light bulb dimming effect | |
| CN109041343A (en) | A kind of LED drive circuit of low electromagnetic | |
| CN108233111A (en) | A kind of connector assembly of removable pulse current | |
| CN209046517U (en) | A kind of circuit filtered suitable for DC/DC power supply combination Surge suppression and EMI | |
| CN207819086U (en) | A kind of connector assembly of removable pulse current | |
| CN202871791U (en) | Encapsulating device of compact single-phase integration driving circuit, and single-phase integration driving circuit | |
| CN206041792U (en) | EMI filter | |
| CN205753990U (en) | A kind of high isolation DC-DC power module | |
| CN213755050U (en) | DMX512 control circuit capable of meeting EMC requirements | |
| CN209375471U (en) | A kind of control circuit based on Switching Power Supply | |
| CN207853870U (en) | A kind of general lock control device based on H-bridge circuit | |
| CN207530705U (en) | A kind of power supply circuit for the non-isolated IGBT driving chips of high pressure | |
| CN201928483U (en) | Constant-current drive circuit for lighting LED | |
| CN105657896B (en) | Exchange dimming LED driver with new start-up circuit and LED illumination System | |
| CN108270425A (en) | A kind of general lock control device based on H-bridge circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |