CN206461806U - A kind of LED driver - Google Patents
A kind of LED driver Download PDFInfo
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- CN206461806U CN206461806U CN201621490287.1U CN201621490287U CN206461806U CN 206461806 U CN206461806 U CN 206461806U CN 201621490287 U CN201621490287 U CN 201621490287U CN 206461806 U CN206461806 U CN 206461806U
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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 provides a kind of LED driver, including：It is provided with the metal shell of threading hole, conductor and the LED drive circuit being arranged in metal shell and common mode lightning protection circuit；Conductor passes through threading hole, and one end is connected in metal shell with the earth terminal of common mode lightning protection circuit, and the other end is fixed in the fixing hole on metal shell, and conductor passes through screw and fixing hole is electrically connected；Metal shell is grounded；Two input terminals of LED drive circuit are connected with two signal output parts of AC power respectively, and two lead-out terminals of LED drive circuit are respectively used to connect one or more LED；Two input terminals of common mode lightning protection circuit are connected with two signal output parts of AC power respectively.The utility model without the step of taking casing apart in the prior art, the voltage-withstand test of drive circuit in the LED driver can be achieved, without the higher gas-discharge tube of alternative costs, the problem of solving voltage-withstand test complex steps in the prior art and gas-discharge tube type selecting.
Description
Technical field
The utility model is related to field of LED drive technology, more particularly, to a kind of LED driver.
Background technology
LED driver generally requires shocking preventing technology, generally uses be connected to power supply or power supply electricity in the prior art
The common mode lightning protection circuit between DC side and ground after the rectification of source；The common mode lightning protection circuit typically uses piezo-resistance and gas
Discharge tube is composed in series, and in order to ensure its lightning protection effect, the pressure-resistant of the gas-discharge tube can not be too big.But the LED drives
Dynamic device is also needed to by voltage-withstand test, in order to ensure voltage-withstand test by, it is necessary to choose the higher gas-discharge tube of cost,
Because its discharge voltage is often larger, it can prevent from being damaged in test process.
, at present will generally in voltage-withstand test in order to solve the problems, such as the pressure-resistant choice between cost of the gas-discharge tube
The common mode lightning protection circuit is disconnected with ground, and only the main circuit of the LED driver is tested；But, in the prior art
The earth terminal of the common mode lightning protection circuit is connected to inside the conductive chassis of the LED driver, and the conductive chassis is again
It is connected to ground, it is desirable to disconnect the connection between the common mode lightning protection circuit and ground, it is necessary to taking the conductive chassis apart could realize,
This will cause testing procedure cumbersome, and increase testing cost, especially carry out the driver of encapsulating processing, and have can
Other devices can be damaged.
Utility model content
The purpose of this utility model is to provide a kind of LED driver, numerous to solve voltage-withstand test step in the prior art
The problem of trivial and gas-discharge tube type selecting.
A kind of LED driver that the utility model is provided, including：It is provided with the metal shell of threading hole, conductor and setting
In the LED drive circuit in the metal shell and common mode lightning protection circuit；
The conductor passes through the threading hole, and one end is located in the metal shell and connect with the common mode lightning protection circuit
Ground terminal is connected, and the other end is fixed in the fixing hole on the metal shell, and the conductor passes through screw and fixing hole electricity
Gas is connected；
The metal shell ground connection；
Two input terminals of the LED drive circuit are connected with two signal output parts of AC power respectively, institute
Two lead-out terminals for stating LED drive circuit are respectively used to connect one or more LED；
Two input terminals of the common mode lightning protection circuit are connected with two signal output parts of AC power respectively.
Preferably, the LED drive circuit includes ac rectifier, control circuit and buck on-off circuit；
The two signal output part phases of the first terminal and Second terminal of the ac rectifier respectively with AC power
Connection, the third terminal of the ac rectifier is connected with the first terminal of the buck on-off circuit, the exchange
The forth terminal of rectification circuit is connected with reference ground；
The first terminal of the control circuit is connected with the Second terminal of the buck on-off circuit, the control electricity
The Second terminal on road is connected with the third terminal of the buck on-off circuit, the third terminal of the control circuit and reference
Ground is connected；
The forth terminal and the 5th terminal of the buck on-off circuit are respectively used to connect one or more LED.
Preferably, the common mode lightning protection circuit includes, thunder and lightning isolation and absorbing circuit and surge protection circuit；
The thunder and lightning isolation includes thunder and lightning isolation circuit and thunder and lightning absorbing circuit with absorbing circuit；
Two signal input parts of the thunder and lightning isolation circuit are respectively used to connect two signal output parts of AC power,
Two signal output parts of the thunder and lightning isolation circuit connect two signal input parts of the thunder and lightning absorbing circuit respectively, described
Two signal output parts of thunder and lightning absorbing circuit are respectively used to connect one or more LED；
The surge protection circuit is arranged between the thunder and lightning isolation circuit and thunder and lightning absorbing circuit, and the surge is protected
The input of protection circuit is connected in one or more LED supply lines
Preferably, the control circuit includes control chip, and the control chip includes：
Drain pin, and the drain electrode pin is the metal oxide semiconductor field effect tube MOSFET inside the control chip
Drain pin, conducting and shut-off for controlling the MOSFET；
First power supply pin, for being powered for the control chip；And
Grounding leg, for being connected with reference ground, wherein
The drain electrode pin is used as the Second terminal of the control circuit, and the first power supply pin is used as the control circuit
The first terminal, and the grounding leg is used as the third terminal of the control circuit.
Preferably, the control chip also includes：
Current detecting pin, for detecting the electric current via the buck on-off circuit, wherein, the current detecting pin via
First resistor is connected with reference ground.
Preferably, the control chip also includes：
Overvoltage protection pin, overvoltage protection is provided for the output end for the LED drive circuit, wherein the overvoltage protection pin
It is connected via second resistance with the first terminal of the buck on-off circuit, and is connected via 3rd resistor with reference ground
Connect.
Preferably, the control chip also includes：
Second power supply pin, for being powered for the control chip, wherein this second power supply pin via the 3rd filter capacitor with
Reference ground is connected.
Preferably, the control chip is pulse width modulation chip.
Preferably, thunder and lightning absorbing circuit includes described in thunder and lightning absorbing circuit：Common mode inductance, the first electric capacity and the second electric capacity；
Two signals that the first input end of the common mode inductance and the second input are respectively used to connect AC power are defeated
Go out end, two signals that the first output end and the second output end of the common mode inductance connect the thunder and lightning isolation circuit respectively are defeated
Enter end；First electric capacity is connected in parallel between the first input end of the common mode inductance and the second input, second electric capacity
It is connected in parallel between the first output end of the common mode inductance and the second output end.
Preferably, the thunder and lightning isolation circuit includes：First differential mode inductance, the second differential mode inductance, the first piezo-resistance,
Two piezo-resistances, the 3rd piezo-resistance and the first discharge tube；
The first end of first differential mode inductance and the first end of second differential mode inductance collectively as the thunder and lightning every
From the input of circuit, the 3rd piezo-resistance is connected to the first end and second differential mode electricity of first differential mode inductance
Between the first end of sense, the second end of first differential mode inductance connects the first end of first piezo-resistance, described second
Second end of differential mode inductance connects the first end of second piezo-resistance, the second end of first piezo-resistance and described the
Second end of two piezo-resistances is grounded by the first discharge tube, the second end of first differential mode inductance and second differential mode electricity
Output end of second end of sense collectively as the thunder and lightning isolation circuit.
The utility model, conductor passes through threading hole, and conductor one end is located in metal shell and connect with common mode lightning protection circuit
Ground terminal is connected, and the other end is fixed in the fixing hole on the metal shell, the metal shell ground connection；When LED drivings
Device can disconnect the connection of the conductor and ground, namely disconnect described when carrying out voltage-withstand test outside the metal shell
The connection of the earth terminal of common mode lightning protection circuit and ground, the step of without taking casing apart in the prior art, you can realize that the LED drives
The voltage-withstand test of drive circuit, without the higher gas-discharge tube of alternative costs, is solved pressure-resistant in the prior art in dynamic device
Testing procedure is cumbersome and the problem of gas-discharge tube type selecting.
Brief description of the drawings
It is new below in conjunction with this practicality to make the purpose, technical scheme and advantage of the utility model embodiment clearer
Accompanying drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that retouched
The embodiment stated is a part of embodiment of the utility model, rather than whole embodiments.Generally here described in accompanying drawing and
The component of the utility model embodiment shown can be arranged and designed with a variety of configurations.Therefore, below to attached
The detailed description of the embodiment of the present utility model provided in figure is not intended to limit claimed scope of the present utility model,
But it is merely representative of selected embodiment of the present utility model.Based on the embodiment in the utility model, ordinary skill people
The every other embodiment that member is obtained under the premise of creative work is not made, belongs to the model of the utility model protection
Enclose.
Fig. 1 is structural representation of the present utility model；
Fig. 2 is the circuit diagram of LED drive circuit of the present utility model；
Fig. 3 is the structural representation of the utility model common mode lightning protection circuit；
Fig. 4 is the circuit diagram of thunder and lightning absorbing circuit of the present utility model；
Fig. 5 is the circuit diagram of thunder and lightning isolation circuit of the present utility model；
Fig. 6 is the circuit diagram of the utility model surge protection circuit.
1-LED drive circuits；2- common mode lightning protection circuits；
3- metal shells；4- threading holes；
5- conductors；6- fixing holes；
7- screws；8- AC powers；
11- ac rectifiers；12- controls circuit；
13- buck on-off circuits；21- thunder and lightning isolation circuits；
22- thunder and lightning absorbing circuits；23- surge protection circuits.
Embodiment
The technical solution of the utility model is clearly and completely described below in conjunction with accompanying drawing, it is clear that described
Embodiment is a part of embodiment of the utility model, rather than whole embodiments.Based on the embodiment in the utility model, sheet
The every other embodiment that field those of ordinary skill is obtained under the premise of creative work is not made, belongs to this practicality
Novel protected scope.
, it is necessary to explanation in description of the present utility model, term " " center ", " on ", " under ", it is "left", "right", " perpendicular
Directly ", the orientation or position relationship of the instruction such as " level ", " interior ", " outer " are, based on orientation shown in the drawings or position relationship, to be only
Described for the ease of description the utility model and simplifying, rather than to indicate or imply that signified device or element must have specific
Orientation, with specific azimuth configuration and operation, therefore it is not intended that to limitation of the present utility model.In addition, term " the
One ", " second ", " the 3rd " are only used for describing purpose, and it is not intended that indicating or implying relative importance.
, it is necessary to which explanation, unless otherwise clearly defined and limited, term " are pacified in description of the present utility model
Dress ", " connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integratedly
Connection；Can be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected to by intermediary,
It can be the connection of two element internals.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition
Concrete meaning of the language in the utility model.
Fig. 1 is structural representation of the present utility model；Fig. 2 is the circuit diagram of LED drive circuit of the present utility model；Fig. 3
For the structural representation of the utility model common mode lightning protection circuit；Fig. 4 is the circuit diagram of thunder and lightning absorbing circuit of the present utility model；Figure
5 be the circuit diagram of thunder and lightning isolation circuit of the present utility model；Fig. 6 is the circuit diagram of the utility model surge protection circuit.
As shown in figure 1, a kind of LED driver that the utility model is provided, including：It is provided with the metal shell of threading hole 4
3, conductor 5 and the LED drive circuit 1 and common mode lightning protection circuit 2 that are arranged in the metal shell 3；
The conductor 5 passes through the threading hole 4, and one end is located in the metal shell 3 and the common mode lightning protection circuit 2
Earth terminal be connected, the other end is fixed in the fixing hole 6 on the metal shell 3, the conductor 5 by screw 7 with it is described
Fixing hole 6 is electrically connected；
The metal shell 3 is grounded；
Two input terminals of the LED drive circuit 1 are connected with two signal output parts of AC power respectively, institute
Two lead-out terminals for stating LED drive circuit 1 are respectively used to connect one or more LED；
Two input terminals of the common mode lightning protection circuit 2 are connected with two signal output parts of AC power respectively.
The utility model, conductor 5 passes through threading hole 4, and the one end of conductor 5 is located in metal shell 3 and common mode lightning protection circuit 2
Earth terminal be connected, the other end is fixed in the fixing hole 6 on the metal shell 3, and the metal shell 3 is grounded；When described
LED driver can disconnect the connection of the conductor 5 and ground when carrying out voltage-withstand test from the outside of metal shell 3, namely
The connection of the earth terminal of the common mode lightning protection circuit 2 and ground is disconnected, the step of without taking casing apart in the prior art, you can realize
The voltage-withstand test of drive circuit in the LED driver, without the higher discharge tube of alternative costs, is solved in the prior art
The problem of voltage-withstand test complex steps and discharge tube type selecting.
The LED driver that the present embodiment is provided, the problem of not only solving voltage-withstand test complex steps in the prior art,
The integrity of the common mode lightning protection circuit 2 during voltage-withstand test is ensure that simultaneously, is unlikely to break the device in common mode lightning protection circuit 2
Part, such as discharge tube so that the selection of device more rationally only can need to consider thunderbolt factor in common mode lightning protection circuit 2,
Without comprehensive consideration thunderbolt and voltage-withstand test.
Preferably, the LED drive circuit 1 includes ac rectifier 11, control circuit 12 and buck on-off circuit
13；
Two signal output parts of the first terminal and Second terminal of the ac rectifier 11 respectively with AC power
It is connected, the third terminal of the ac rectifier 11 is connected with the first terminal of the buck on-off circuit 13, institute
The forth terminal for stating ac rectifier 11 is connected with reference ground；
The first terminal of the control circuit 12 is connected with the Second terminal of the buck on-off circuit 13, the control
The Second terminal of circuit 12 processed is connected with the third terminal of the buck on-off circuit 13, and the 3rd of the control circuit 12 the
Terminal is connected with reference ground；
The forth terminal and the 5th terminal of the buck on-off circuit 13 are respectively used to connect one or more LED.
The LED drive circuit 1 that the present embodiment is provided has the advantages that high conversion efficiency, cost are low and defencive function is complete.
As shown in Fig. 2 being the circuit diagram of LED drive circuit 1, AC power AC input ac rectifier 11 includes insurance
Silk F1, commutation diode D1, D2, D3, D4, and the first filter capacitor C1.Wherein, four commutation diodes D1, D2, D3, D4
Linked together with rectifier bridge structure, for carrying out rectification to AC signal；First filter capacitor C1 is used for the letter after rectification
Number it is filtered.
The control circuit 12 includes including control chip U1, the control chip U1：
Drain pin (DRAIN), and the drain electrode pin is the field-effect of metal-oxide semiconductor (MOS) 5 inside the control chip U1
Pipe MOSFET drain electrode pin, conducting and shut-off for controlling the MOSFET；
First power supply pin (HV), for being powered for the control chip U1；
Grounding leg (GND), for being connected with reference ground, wherein
The drain electrode pin is used as the Second terminal of the control circuit 12, and the first power supply pin is used as the control circuit
12 the first terminal, and the grounding leg is used as the third terminal of the control circuit 12.
Current detecting pin (CS), for detecting the electric current via the buck on-off circuit 13, wherein, the current detecting
Pin is connected via first resistor R1 with reference ground；
Overvoltage protection pin (OVP), provides overvoltage protection, the wherein overvoltage for the output end for the LED drive circuit 1
Protection pin is connected via second resistance R2 with the first terminal of the buck on-off circuit 13, and via 3rd resistor R3
It is connected with reference ground；And
Second power supply pin (VCC), for being powered for the control chip U1, wherein the second power supply pin is via the 3rd filtering
Electric capacity C3 is connected with reference ground.
The control chip U1 is pulse width modulation chip, model TL2842P, UC2525ADW, SG2524D and
Function of the present utility model can be achieved in TL1454ACN isopulse width modulated chips, can be chosen according to actual conditions.
Buck on-off circuit 13 includes the second filter capacitor C2, buck inductor L1 and sustained diode 5.Wherein,
Buck inductor L1 the first terminal and the first terminal of sustained diode 5 as buck configuration on-off circuit third terminal with
The Second terminal of control circuit 12 is connected, and the Second terminal of sustained diode 5 and buck inductor L1 Second terminal are made respectively
For the Second terminal and the first terminal of buck on-off circuit 13, and the second filter capacitor C2 and one as load or
Multiple LED are connected in parallel between the Second terminal of buck inductor L1 Second terminal and sustained diode 5.
As shown in figure 3, being the structural representation of common mode lightning protection circuit 2, the common mode lightning protection circuit 2 includes, thunder and lightning isolation
With absorbing circuit and surge protection circuit 23；
The thunder and lightning isolation includes thunder and lightning isolation circuit 21 and thunder and lightning absorbing circuit 22 with absorbing circuit；
Two signal input parts of the thunder and lightning isolation circuit 21 are respectively used to connect two signal outputs of AC power
End, two signal output parts of the thunder and lightning isolation circuit 21 connect two signals input of the thunder and lightning absorbing circuit 22 respectively
End, two signal output parts of the thunder and lightning absorbing circuit 22 are respectively used to connect one or more LED；
The surge protection circuit 23 is arranged between the AC power and thunder and lightning isolation and absorbing circuit, and institute
The input for stating surge protection circuit 23 is connected in one or more LED supply lines.
The lightning protection circuit that the present embodiment is proposed is that thunder and lightning isolation is connected in the supply line by protection equipment with absorbing electricity
Road, thunder and lightning isolation and absorbing circuit include the thunder and lightning isolation circuit 21 absorbed to lightning current and the electric current to passing through
The thunder and lightning absorbing circuit 22 of frequency-selective filtering is carried out, the biography of lightning current is prevented to cause power frequency component or carrier signal to be able to by
It is defeated, serve lightning protection effect.Relative to prior art, the lightning protection circuit is no longer dependent on grounded screen resistance and by protection equipment
Characteristic impedance ratio distributes the shunt ratio of lightning current, and lightning protection effect is good.
As shown in figure 4, thunder and lightning isolation circuit 21 includes described in thunder and lightning isolation circuit 21：Common mode inductance L2, the first electric capacity
Cx1 and the second electric capacity Cx2；
The first input end and the second input of the common mode inductance L2 is respectively used to connect two signals of AC power
Output end, the first output end and the second output end of the common mode inductance L2 connect two of the thunder and lightning absorbing circuit 22 respectively
Signal input part；The first electric capacity Cx1 is connected in parallel between the first input end of the common mode inductance L2 and the second input, institute
The second electric capacity Cx2 is stated to be connected in parallel between the first output end of the common mode inductance L2 and the second output end.
As shown in figure 5, the thunder and lightning absorbing circuit 22 includes：First differential mode inductance L3, the second differential mode inductance L4, the first pressure
Quick resistance RV1, the second piezo-resistance RV2, the 3rd piezo-resistance RV3 and the first discharge tube G1；
The first end of the first differential mode inductance L3 and the first end of the second differential mode inductance L4 are collectively as the thunder
The input of electric isolating circuit, the 3rd piezo-resistance RV3 is connected to the first end of the first differential mode inductance L3 and described
Between second differential mode inductance L4 first end, the second end of the first differential mode inductance L3 connects the first piezo-resistance RV1
First end, the second end of the second differential mode inductance L4 connects the first end of the second piezo-resistance RV2, first pressure
Quick resistance RV1 the second end and the second end of the second piezo-resistance RV2 are grounded by the first discharge tube G1, and described first is poor
The output end of mould inductance L3 the second end and the second end of the second differential mode inductance L4 collectively as the thunder and lightning isolation circuit.
As shown in fig. 6, in the present embodiment, surge protection circuit 23 includes：4th piezo-resistance RV4, the 5th piezo-resistance
RV5, the 6th piezo-resistance RV6 and the second discharge tube G2.Wherein, the 4th piezo-resistance RV4 two ends are connected in parallel on AC power
Two signal output parts, the 5th piezo-resistance RV5 one end connection live wire, the 5th piezo-resistance RV5 other end passes through second
Discharge tube G2 is grounded, and the 6th piezo-resistance RV6 one end connection zero line, the 6th piezo-resistance RV6 other end is put by second
Fulgurite G2 is grounded.
The operation principle of common mode lightning protection circuit 2 is：Part lightning current in the electric current of AC power output passes through wave first
Gush protection circuit 23 and enter ground, the lightning current of remainder enters thunder and lightning isolation and the absorbing circuit of rear class.Due to thunder and lightning isolation with
The effect of absorbing circuit so that the fast conducting of surge protection circuit 23, extends releasing the time for surge protection circuit 23, thus
Can be released more thunder and lightning stream energies.
Finally it should be noted that：Various embodiments above is only limited to illustrate the technical solution of the utility model, rather than to it
System；Although the utility model is described in detail with reference to foregoing embodiments, one of ordinary skill in the art should
Understand：It can still modify to the technical scheme described in foregoing embodiments, or to which part or whole
Technical characteristic carries out equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from this practicality newly
The scope of each embodiment technical scheme of type.
Claims (10)
1. a kind of LED driver, it is characterised in that including：It is provided with the metal shell of threading hole, conductor and is arranged at the gold
Belong to the LED drive circuit and common mode lightning protection circuit in housing；
The conductor passes through the threading hole, and one end is located at the earth terminal in the metal shell with the common mode lightning protection circuit
It is connected, the other end is fixed in the fixing hole on the metal shell, and the conductor is electrically connected by screw with the fixing hole
Connect；
The metal shell ground connection；
Two input terminals of the LED drive circuit are connected with two signal output parts of AC power respectively, the LED
Two lead-out terminals of drive circuit are respectively used to connect one or more LED；
Two input terminals of the common mode lightning protection circuit are connected with two signal output parts of AC power respectively.
2. LED driver according to claim 1, it is characterised in that the LED drive circuit includes AC rectification electricity
Road, control circuit and buck on-off circuit；
The first terminal and Second terminal of the ac rectifier are connected with two signal output parts of AC power respectively,
The third terminal of the ac rectifier is connected with the first terminal of the buck on-off circuit, the AC rectification electricity
The forth terminal on road is connected with reference ground；
The first terminal of the control circuit is connected with the Second terminal of the buck on-off circuit, the control circuit
Second terminal is connected with the third terminal of the buck on-off circuit, the third terminal and reference ground phase of the control circuit
Connection；
The forth terminal and the 5th terminal of the buck on-off circuit are respectively used to connect one or more LED.
3. LED driver according to claim 1 or 2, it is characterised in that the common mode lightning protection circuit includes, thunder and lightning every
From with absorbing circuit and surge protection circuit；
The thunder and lightning isolation includes thunder and lightning isolation circuit and thunder and lightning absorbing circuit with absorbing circuit；
Two signal input parts of the thunder and lightning isolation circuit are respectively used to connect two signal output parts of AC power, described
Two signal output parts of thunder and lightning isolation circuit connect two signal input parts of the thunder and lightning absorbing circuit, the thunder and lightning respectively
Two signal output parts of absorbing circuit are respectively used to connect one or more LED；
The surge protection circuit is arranged between the thunder and lightning isolation circuit and thunder and lightning absorbing circuit, and surge protection electricity
The input on road is connected in one or more LED supply lines.
4. LED driver according to claim 2, it is characterised in that the control circuit includes control chip, the control
Coremaking piece includes：
Drain pin, and the drain electrode pin is the drain electrode of the metal oxide semiconductor field effect tube MOSFET inside the control chip
Pin, conducting and shut-off for controlling the MOSFET；
First power supply pin, for being powered for the control chip；And
Grounding leg, for being connected with reference ground, wherein
The drain electrode pin is used as the Second terminal of the control circuit, and the first power supply pin is used as the first of the control circuit
Terminal, and the grounding leg is used as the third terminal of the control circuit.
5. LED driver according to claim 4, it is characterised in that the control chip also includes：
Current detecting pin, for detecting the electric current via the buck on-off circuit, wherein, the current detecting pin is via first
Resistance is connected with reference ground.
6. LED driver according to claim 5, it is characterised in that the control chip also includes：
Overvoltage protection pin, overvoltage protection is provided for the output end for the LED drive circuit, wherein the overvoltage protection pin via
Second resistance is connected with the first terminal of the buck on-off circuit, and is connected via 3rd resistor with reference ground.
7. LED driver according to claim 6, it is characterised in that the control chip also includes：
Second power supply pin, for being powered for the control chip, wherein the second power supply pin is via the 3rd filter capacitor and reference
Ground is connected.
8. LED driver according to claim 7, it is characterised in that the control chip is pulse width modulation chip.
9. LED driver according to claim 3, it is characterised in that thunder and lightning absorbing circuit bag described in thunder and lightning absorbing circuit
Include：Common mode inductance, the first electric capacity and the second electric capacity；
The first input end of the common mode inductance and the second input are respectively used to connect two signal output parts of AC power,
The first output end and the second output end of the common mode inductance connect two signal input parts of the thunder and lightning isolation circuit respectively；
First electric capacity is connected in parallel between the first input end of the common mode inductance and the second input, and second electric capacity is connected in parallel on
Between the first output end and the second output end of the common mode inductance.
10. LED driver according to claim 9, it is characterised in that the thunder and lightning isolation circuit includes：First differential mode
Inductance, the second differential mode inductance, the first piezo-resistance, the second piezo-resistance, the 3rd piezo-resistance and the first discharge tube；
The first end of first differential mode inductance and the first end of second differential mode inductance isolate electricity collectively as the thunder and lightning
The input on road, the 3rd piezo-resistance is connected to the first end and second differential mode inductance of first differential mode inductance
Between first end, the second end of first differential mode inductance connects the first end of first piezo-resistance, second differential mode
Second end of inductance connects the first end of second piezo-resistance, the second end of first piezo-resistance and second pressure
Second end of quick resistance is grounded by the first discharge tube, the second end of first differential mode inductance and second differential mode inductance
Output end of second end collectively as the thunder and lightning isolation circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621490287.1U CN206461806U (en) | 2016-12-30 | 2016-12-30 | A kind of LED driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621490287.1U CN206461806U (en) | 2016-12-30 | 2016-12-30 | A kind of LED driver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206461806U true CN206461806U (en) | 2017-09-01 |
Family
ID=59698090
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621490287.1U Withdrawn - After Issue CN206461806U (en) | 2016-12-30 | 2016-12-30 | A kind of LED driver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206461806U (en) |
-
2016
- 2016-12-30 CN CN201621490287.1U patent/CN206461806U/en not_active Withdrawn - After Issue
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