CN208128584U - A kind of double winding primary side feedback LED drive circuit - Google Patents
A kind of double winding primary side feedback LED drive circuit Download PDFInfo
- Publication number
- CN208128584U CN208128584U CN201820535760.6U CN201820535760U CN208128584U CN 208128584 U CN208128584 U CN 208128584U CN 201820535760 U CN201820535760 U CN 201820535760U CN 208128584 U CN208128584 U CN 208128584U
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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
A kind of double winding primary side feedback LED drive circuit, including current rectifying and wave filtering circuit, VCC voltage generation circuit, switching controller circuit and transformer circuit, the GND foot of DRAIN foot and switching controller circuit of the VCC voltage through switching controller circuit is sent to the armature winding of transformer, it is returned publicly by the winding, forms a closed circuit；It powers after the rectified filtering of transformer secondary output to LED.The switching controller circuit includes pwm control circuit and the power switch drive control circuit, LED open loop protection circuit, primary side inductance peak current detection circuit, driving circuit and the switching tube that are attached thereto.Its advantage is that switching controller circuit peripheral element number is less, design is succinct, reduces cost, improves the overall cost-effective performance of power supply.
Description
Technical field
The utility model relates to the control circuits of electric light source, are related to isolated LED drive circuit, and espespecially a kind of double winding is former
Feed back LED drive circuit in side.
Background technique
Great power LED actuation techniques develop to primary side feedback constant current driving from secondary side feedback constant current driving and have been carried out once
Great-leap-forward advances, and with the maturation of LED light source technology and LED lamp market or the maturation of product, masses are to LED drive power
Cost performance more stringent requirements are proposed, how on the basis of primary side feedback constant current driving to reduce cost, simplify production, improve
Efficiency has become the uncharted field that industry explores innovation.Wherein double winding primary side feedback LED drive scheme becomes what everybody had an optimistic view of
Direction, the reason is that double winding VCC feedback winding fewer than original 3 traditional winding schemes, simplifies the technique for coiling of transformer
With production cost, while also simplify power supply design, reduce power supply switch controller circuit U 1 peripheral cell, reduce power supply
The cost of production, improves cost performance.
Secondary side feedback：Refer to the power switch control that the information of the voltage and current of secondary end is fed back to primary side using optocoupler
Device circuit U 1 processed, then a kind of control model that output voltage electric current is controlled by power supply switch controller circuit U 1.
Primary side feedback：Refer to and does not need therefrom to tell secondary directly by the mutual induction of transformer winding with optocoupler
Voltage and current information, and this information is sent to power supply switch controller circuit U 1, so that the voltage and current to output carries out
A kind of control model of control.
Summary of the invention
The developing direction for acting in accordance with the prior art, the purpose of this utility model is to provide a kind of double winding primary side feedback LED
Driving circuit.It is further intended to simplify double winding primary side feedback circuit construction of electric power, reduces power supply production cost.
Technical solution adopted by the utility model to solve its technical problems is：A kind of double winding primary side feedback LED is provided
Driving circuit, it is characterised in that：Including current rectifying and wave filtering circuit, VCC voltage generation circuit, switching controller circuit and transformer electricity
The GND foot on road, DRAIN foot and switching controller circuit of the VCC voltage through switching controller circuit is sent to the primary of transformer
Winding is returned publicly by the winding, forms a closed circuit；It powers after the rectified filtering of transformer secondary output to LED.
The switching controller circuit includes pwm control circuit and the power switch drive control circuit being attached thereto, LED
Open loop protection circuit, primary side inductance peak current detection circuit, driving circuit and switching tube, the power switch drive control electricity
Road meets VCC, and LED open loop protection circuit input terminal connects OVP terminal, and primary side inductance peak current detection circuit connects line voltage and mends
Circuit and LEB circuit are repaid, LEB circuit connects switching tube and drains and connect CS terminal, and driving circuit output termination switching tube gate pole is opened
It closes pipe source electrode and connects DRAIN terminal, VCC terminal connects zener diode cathode, and zener diode anode connects GND terminal.
In the switching controller circuit, VCC terminal connection third capacitor first end simultaneously connects VCC voltage, and OVP terminal connects the
Five resistance first ends, CS terminal connect the 6th resistance first end, the 5th resistance second end, the 6th resistance second end, third capacitor
Two ends and GND terminal connect transformer first end, and DRAIN terminal connects rectifying and wave-filtering output voltage terminal.
The current rectifying and wave filtering circuit includes rectifier bridge and first capacitor
The VCC voltage generation circuit includes concatenated first resistor, second resistance, 3rd resistor and first diode,
First diode plus earth, the second capacitor is in parallel with 3rd resistor, and the tie point output of second resistance and 3rd resistor is VCC
Voltage.
In the transformer circuit, transformer secondary output is powered by the second diode rectification, the 4th capacitor filtering to LED.
The utility model has the beneficial effects that：Switching controller circuit peripheral element number is less, and design is succinct, reduce at
This, improves the overall cost-effective performance of power supply.
Detailed description of the invention
The utility model will be further described with reference to the accompanying drawing.
Fig. 1 is the electrical structure schematic diagram of the utility model.
Fig. 2 is the utility model switching controller circuit block diagram.
Fig. 3 is the double winding primary side feedback LED drive circuit schematic diagram of the prior art.
Specific embodiment
Referring to attached drawing, a kind of double winding primary side feedback LED drive circuit of the utility model, it is characterised in that：Including rectification
Filter circuit, VCC voltage generation circuit, switching controller circuit and transformer circuit, VCC voltage is through switching controller circuit U1
DRAIN foot and the GND foot of switching controller circuit U1 be sent to the armature winding of transformer, returned publicly by the winding,
Form a closed circuit；It powers after the rectified filtering of transformer secondary output to LED.
In the embodiments of the present invention：
The switching controller circuit include pwm control circuit 1 and be attached thereto power switch drive control circuit 2,
LED open loop protection circuit 6, primary side inductance peak current detection circuit 8, driving circuit 11 and switching tube 13, the power switch
Drive control circuit 2 meets VCC, and 6 input terminal of LED open loop protection circuit connects OVP terminal, primary side inductance peak current detection circuit
8 connection line voltage compensation circuits 9 and LEB circuit 10, LEB circuit 10 connect switching tube 13 and drain and connect CS terminal, driving circuit
10 output termination 13 gate poles of switching tube, 13 source electrode of switching tube connect DRAIN terminal, and VCC terminal connects 12 cathode of zener diode, pressure stabilizing
12 anode of diode connects GND terminal.
In the switching controller circuit, VCC terminal connection third capacitor C3 first end simultaneously connects VCC voltage, and OVP terminal connects
5th resistance R5 first end, CS terminal connect the 6th resistance first end, the 5th resistance R5 second end, the 6th resistance second end, third
Capacitor C3 second end and GND terminal connect transformer first end, and DRAIN terminal connects rectifying and wave-filtering output voltage terminal.
The current rectifying and wave filtering circuit includes BD1 rectifier bridge and first capacitor C1.
The VCC voltage generation circuit includes concatenated first resistor R1, second resistance R2,3rd resistor R3 and the one or two
Pole pipe D1, first diode D1 plus earth, the second capacitor C2 is in parallel with 3rd resistor R3, second resistance R2 and 3rd resistor R3
Tie point output be VCC voltage.
In the transformer circuit, transformer secondary output is rectified by the second diode D2, and LED is given in the 4th capacitor C4 filtering
Power supply.
The rectified circuit BD1 rectification of alternating current, is supplied to whole system operating voltage/electric current after first capacitor C1 filtering, female
Line voltage/electric current is depressured through first resistor R1, second resistance R2, is charged after 3rd resistor R3 partial pressure to the second capacitor C2, and second
Capacitor C2 is connected with the VCC foot of switching controller circuit U1, when the second capacitor C2 voltage rises to the starting voltage value of VCC, opens
Controller circuitry U1 is closed to start to work.At this point, DRAIN foot and GND foot of the busbar voltage/electric current through switching controller circuit U1 will
Voltage/current is sent to the armature winding of transformer, and returns bus publicly by the winding, forms a closed circuit.
During the conducting of primary winding is closed with pipe, secondary induction goes out secondary voltage/electric current, and passes through the second diode D2
Rectification, the 4th capacitor C4 filtering, powers to LED, wherein the 4th resistance R4 is fictitious load, with one be supplied to when secondary zero load
Access.It after switching controller circuit U1 work, is rectified by first diode D1,3rd resistor R3 current limliting, third capacitor C3 filter
Wave is supplied to the voltage/current of VCC normal work.Since busbar voltage/electric current is led to inside flow path switching controller circuit U1
The voltage/current that internal primary side inductance peak current detection circuit 8 detects armature winding is crossed, and passes through the external electric current of CS foot
Resistance is set, to set output electric current, and passes through the external OVP voltage setting resistors R5 of OVP foot of switching controller circuit U1, with
Setting output OVP voltage.When output voltage/electric current changes, corresponding signal can be generated on the secondary winding, pass through change
The coupling of depressor primary comes, and is controlled by detection inside switching controller circuit U1.
Claims (6)
1. a kind of double winding primary side feedback LED drive circuit, it is characterised in that：Electricity is generated including current rectifying and wave filtering circuit, VCC voltage
Road, switching controller circuit and transformer circuit, DRAIN foot and switch controller electricity of the VCC voltage through switching controller circuit
The GND foot on road is sent to the armature winding of transformer, is returned publicly by the winding, forms a closed circuit；Transformer
It powers after the rectified filtering of grade to LED.
2. double winding primary side feedback LED drive circuit according to claim 1, it is characterised in that：The switch controller
Circuit includes pwm control circuit and the power switch drive control circuit being attached thereto, LED open loop protection circuit, primary side inductance
Peak current detection circuit, driving circuit and switching tube, the power switch drive control circuit connect VCC, LED open-circuit-protection electricity
Road input terminal connects OVP terminal, and primary side inductance peak current detection circuit connects line voltage compensation circuit and LEB circuit, LEB electricity
Road connects switching tube and drains and connect CS terminal, driving circuit output termination switching tube gate pole, and switching tube source electrode connects DRAIN terminal,
VCC terminal connects zener diode cathode, and zener diode anode connects GND terminal.
3. double winding primary side feedback LED drive circuit according to claim 1, it is characterised in that：The switch controller
In circuit, VCC terminal connection third capacitor first end simultaneously connects VCC voltage, and OVP terminal connects the 5th resistance first end, and CS terminal connects
6th resistance first end, the 5th resistance second end, the 6th resistance second end, third capacitor second end and GND terminal connect transformer
Primary coil first end, DRAIN terminal connect rectifying and wave-filtering output voltage terminal.
4. double winding primary side feedback LED drive circuit according to claim 1, it is characterised in that：The rectifying and wave-filtering electricity
Road includes rectifier bridge and first capacitor.
5. double winding primary side feedback LED drive circuit according to claim 1, it is characterised in that：The VCC voltage generates
Circuit includes concatenated first resistor, second resistance, 3rd resistor and first diode, first diode plus earth, and second
Capacitor is in parallel with 3rd resistor, and the tie point output of second resistance and 3rd resistor is VCC voltage.
6. double winding primary side feedback LED drive circuit according to claim 1, it is characterised in that：The transformer circuit
In, transformer secondary output is powered by the second diode rectification, the 4th capacitor filtering to LED.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820535760.6U CN208128584U (en) | 2018-04-16 | 2018-04-16 | A kind of double winding primary side feedback LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820535760.6U CN208128584U (en) | 2018-04-16 | 2018-04-16 | A kind of double winding primary side feedback LED drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208128584U true CN208128584U (en) | 2018-11-20 |
Family
ID=64191652
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820535760.6U Expired - Fee Related CN208128584U (en) | 2018-04-16 | 2018-04-16 | A kind of double winding primary side feedback LED drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208128584U (en) |
-
2018
- 2018-04-16 CN CN201820535760.6U patent/CN208128584U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181120 Termination date: 20210416 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |