CN208768318U - A kind of LED switch power supply fast start circuit - Google Patents
A kind of LED switch power supply fast start circuit Download PDFInfo
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- CN208768318U CN208768318U CN201820969195.4U CN201820969195U CN208768318U CN 208768318 U CN208768318 U CN 208768318U CN 201820969195 U CN201820969195 U CN 201820969195U CN 208768318 U CN208768318 U CN 208768318U
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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]
Abstract
The utility model discloses a kind of LED switch power supply fast start circuits, it include: a main circuit, the main circuit includes start-up circuit, the start-up circuit includes a N-channel depletion type MOS tube, the N-channel depletion type MOS tube connects the first voltage to first charging capacitor under a control signal function and realizes charging, the lower shutdown start-up circuit of the enhanced metal-oxide-semiconductor control of the N-channel that the N-channel depletion type MOS tube is controlled in one by the second driving signal；One AC-DC controls chip, and a DC-DC controls chip, and the second driving end is less than 0.5S for generating the second driving signal, the LED drive power starting up time.The structure of this start-up circuit is very simple, high reliablity and cost is very low.Using conducting channel existing for depletion type MOS itself, voltage, the characteristic that MOS can also be connected, to save driving circuit is not added in grid.Simultaneously in power supply output over-voltage protection, start-up resistor can be also cut off, in the presence of failure, guarantees that fast start circuit will not work.
Description
Technical field
The utility model relates to LED switch power supply quick starts and output over-voltage protection technical field, more particularly to one kind
LED switch power supply fast start circuit.
Background technique
In order to meet the requirement of LED drive power starting time, other fast start circuits on the market generally use N ditch
The enhanced MOSFET in road, this just needs driving circuit control grid voltage that Vgs > Vth, MOS is connected, and LED drive power is opened
The machine starting time generally requires to be less than 0.5S, and therefore, to solve starting up's time, it is necessary to design a kind of fast start circuit.
Summary of the invention
In view of this, the purpose of the utility model is to provide a kind of LED switch power supply fast start circuits.
In order to achieve the above objectives, the utility model is achieved through the following technical solutions.
A kind of LED switch power supply fast start circuit includes:
One main circuit, the main circuit include start-up circuit, and the start-up circuit includes a N-channel depletion type MOS tube, institute
The drain electrode for stating N-channel depletion type MOS tube connects first voltage by an at least start-up resistor；The N-channel depletion type MOS tube
Source electrode connects one first charging capacitor, and the N-channel depletion type MOS tube connects the first voltage under a control signal function
Charging is realized to first charging capacitor, first charging capacitor is equipped with first end and second end, and the second end is grounded,
It is opened described in the lower shutdown of the enhanced metal-oxide-semiconductor control of the N-channel that the N-channel depletion type MOS tube is controlled in one by the second driving signal
Dynamic circuit；
One AC-DC controls chip, including the first VCC pin, one first driving signal output pin, the first VCC draw
Foot connects the first end of first charging capacitor；The first driving signal output pin generates the first driving signal；
One DC-DC controls chip, is equipped with the first driving end, the second driving end, the second VCC pin, first driving end
First driving signal is connected, the second driving end connects work for generating the second driving signal, second VCC pin
Make voltage.
Preferably, the main circuit further includes an overvoltage crowbar, and the overvoltage crowbar includes:
One voltage-stabiliser tube, the cathode of the voltage-stabiliser tube connect the positive terminal of a third capacitor, the negative pole end of the third capacitor
Connect ground terminal；The positive terminal of the third capacitor and the induced voltage output end of auxiliary winding are connected by a first diode
It connects；
The emitter of one first triode, first triode connects the operating voltage, first triode
Collector connects second driving signal, and the base stage of first triode passes through one the 7th resistance and the 4th capacitance connection institute
State operating voltage；
One second triode, the emitter ground connection of second triode, the collector of second triode pass through the
Three resistance connect the base stage of first triode；The base stage of second triode connects the pressure stabilizing by one the 5th resistance
The base stage of the anode of pipe, second triode passes through one the 4th resistance eutral grounding；The both ends parallel connection one the 7th of 4th resistance
Capacitor.
Preferably, the overvoltage protection also circuit includes:
One third transistor, the transistor emitter connect the operating voltage, the base stage of the third transistor
By the 6th resistance and the collector for being connected to the third transistor, the base stage of the third pole pipe by the voltage-stabiliser tube with
Ground terminal connection.
It preferably, further include third diode, the cathode of the third diode connects one end of the tenth resistance, and described the
The anode of three diodes is connect with the operating voltage.
Preferably, the anode of the second diode is connect with the D foot of DC-DC control chip；Second diode
Cathode is connect by an eleventh resistor with the grid of the enhanced metal-oxide-semiconductor of the N-channel.
Preferably, the LED drive power starting up time is less than 0.5S.
Preferably, first charging capacitor and third capacitor are electrolytic capacitor.
Utility model has the advantages that
The structure of this start-up circuit is very simple, high reliablity and cost is very low.
This circuit uses N-channel depletion type MOS FET, and using conducting channel existing for depletion type MOS itself, grid is not added
Voltage, the characteristic that MOS can also be connected, to save driving circuit.In order to solve quick start resistance bring power problems, in electricity
After the start completion of source, start-up resistor is cut off, to improve overall efficiency, while in power supply output over-voltage protection, also can
Start-up resistor is cut off, in the presence of failure, guarantees that fast start circuit will not work.
Detailed description of the invention
It, below will be to use required in embodiment in order to illustrate more clearly of the technical solution of the utility model embodiment
Attached drawing be briefly described, it should be understood that the following drawings illustrates only some embodiments of the utility model, therefore should not be by
Regard the restriction to range as, for those of ordinary skill in the art, without creative efforts, may be used also
To obtain other relevant attached drawings according to these attached drawings.
Fig. 1 is a kind of circuit diagram of LED switch power supply fast start circuit embodiment of the utility model.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are in the premise for not making creative work
Under every other embodiment obtained, fall within the protection scope of the utility model.
It should be noted that in the absence of conflict, the feature in the embodiments of the present invention and embodiment can
To be combined with each other.
The utility model is described in further detail in the following with reference to the drawings and specific embodiments, but not as the utility model
It limits.
As shown in Figure 1, according to problem of the existing technology, now providing one kind in the utility model preferred embodiment
LED switch power supply fast start circuit includes:
One main circuit, main circuit include start-up circuit, and start-up circuit includes a N-channel depletion type MOS tube, and N-channel exhausts
The drain electrode of type metal-oxide-semiconductor connects first voltage by an at least start-up resistor；The source electrode connection one first of N-channel depletion type MOS tube
Charging capacitor, connection first voltage to the first charging capacitor realization under a control signal function of N-channel depletion type MOS tube are filled
Electricity, the first charging capacitor are equipped with first end and second end, second end ground connection, and N-channel depletion type MOS tube is believed in one by the second driving
The enhanced metal-oxide-semiconductor of N-channel of number control controls lower shutdown start-up circuit；
One AC-DC controls chip, including the first VCC pin, one first driving signal output pin, and the first VCC pin connects
Connect the first end of the first charging capacitor；First driving signal output pin generates the first driving signal；
One DC-DC controls chip, is equipped with the first driving end, the second driving end, the second VCC pin, the first driving end connection
First driving signal, the second driving end connect operating voltage for generating the second driving signal, the 2nd VCC pin.
In the utility model preferred embodiment, main circuit further includes an overvoltage crowbar, and overvoltage crowbar includes:
One voltage-stabiliser tube, the cathode of voltage-stabiliser tube connect the positive terminal of a third capacitor, and the negative pole end of third capacitor connects ground connection
End；The positive terminal of third capacitor and the induced voltage output end of auxiliary winding are connected by a first diode；
One first triode, the emitter of the first triode connect operating voltage, the collector connection of the first triode the
The base stage of two driving signal, the first triode passes through one the 7th resistance and the 4th capacitance connection operating voltage；
One second triode, the emitter ground connection of the second triode, the collector of the second triode are connected by 3rd resistor
Connect the base stage of the first triode；The base stage of second triode connects the anode of voltage-stabiliser tube, the second triode by one the 5th resistance
Base stage pass through one the 4th resistance eutral grounding；The both ends of 4th resistance one the 7th capacitor in parallel.
In the utility model preferred embodiment, overvoltage protection also circuit includes:
One third transistor, transistor emitter connect operating voltage, and the base stage of third transistor passes through the 6th resistance
It is connect by voltage-stabiliser tube with ground terminal with the base stage of the collector for being connected to third transistor, third pole pipe.
It further include third diode, the tenth electricity of cathode connection of third diode in the utility model preferred embodiment
The anode of one end of resistance, third diode is connect with operating voltage.
In the utility model preferred embodiment, the anode of the second diode is connect with the D foot of DC-DC control chip；The
The cathode of two diodes is connect by an eleventh resistor with the grid of the enhanced metal-oxide-semiconductor of N-channel.
In the utility model preferred embodiment, LED drive power starting up's time is less than 0.5S.
In the utility model preferred embodiment, the first charging capacitor and third capacitor are electrolytic capacitor.
Specifically, the working principle of LED switch power supply fast start circuit:
As shown in Figure 1, by taking 100W/24V LED switch power supply as an example.
Q3 is N-channel depletion type MOS in this start-up circuit, and Q1 is the enhanced MOS of N-channel, and U1 is the control of AC-DC topology
Chip, U2 are that DC-DC topology controls chip, the big Mr. Yu's threshold voltage of DIS foot, chip locking shutdown.Work as power supply electrifying, utilizes Q3
There are conducting channel characteristic, VAC to be charged by R1, R2 to C1 for itself, and when VCC voltage reaches the cut-in voltage of U1, U1 starts work
Make, GATE foot generates driving signal and controls AC-DC circuit, and then U2 chip is started to work, and generates VGS driving signal and controls DC-
DC circuit, output voltage are begun to ramp up, finally stable in 24V.Auxiliary winding AUX and vice-side winding inductive coupling go out voltage, pass through
Serial regulating circuit is crossed to power to chip.VCC controls Q1 conducting by D3, R10, makes Q3 grounded-grid, and VGS becomes negative voltage,
Q3 shutdown, to cut off start-up resistor R1, R2.After the completion of power initiation, start-up resistor is cut off, improves overall efficiency.ZD2,
Q2, Q4 constitute an output overvoltage protection circuit, when output overvoltage, after the rectification of auxiliary winding induced voltage, and C3 both end voltage
Accordingly becoming larger, controls Q4 triode ON, Q4 grounded collector, Q2 is also switched on, and D current potential is approximately equal to VCC, it is greater than threshold voltage,
Chip locking shutdown.In trouble time, D foot current potential controls Q1 conducting, Q3 grid voltage ground connection, Q3 shutdown, excision by D2
R1,R2.Guarantee that, in failure phase, fast start circuit will not work.
The utility model has the beneficial effects that:
The structure of this start-up circuit is very simple, high reliablity and cost is very low.Using N-channel depletion type MOS FET, benefit
Voltage, the characteristic that MOS can also be connected, to save driving circuit is not added in the conducting channel existing for depletion type MOS itself, grid.
In order to solve quick start resistance bring power problems, after power initiation completion, start-up resistor is cut off, to improve whole
Engine efficiency.Simultaneously in power supply output over-voltage protection, start-up resistor can be also cut off, in the presence of failure, is guaranteed fast
Fast start-up circuit will not work.
The foregoing is merely the utility model preferred embodiment, be not intended to limit the embodiments of the present invention and
Protection scope should can appreciate that all in the utility model specification and diagram to those skilled in the art
Hold made equivalent replacement and obviously change obtained scheme, the protection model of the utility model should all be included in
In enclosing.
Claims (7)
1. a kind of LED switch power supply fast start circuit characterized by comprising
One main circuit, the main circuit include start-up circuit, and the start-up circuit includes a N-channel depletion type MOS tube, the N
The drain electrode of channel depletion type metal-oxide-semiconductor connects first voltage by an at least start-up resistor；The source of the N-channel depletion type MOS tube
Pole connects one first charging capacitor, and the N-channel depletion type MOS tube connects the first voltage extremely under a control signal function
First charging capacitor realizes charging, and first charging capacitor is equipped with first end and second end, the second end ground connection, institute
State the N-channel enhanced metal-oxide-semiconductor control lower shutdown starting that N-channel depletion type MOS tube is controlled in one by the second driving signal
Circuit；
One AC-DC controls chip, including the first VCC pin, one first driving signal output pin, and first VCC pin connects
Connect the first end of first charging capacitor；The first driving signal output pin generates the first driving signal；
One DC-DC controls chip, is equipped with the first driving end, the second driving end, the second VCC pin, first driving end connection
First driving signal, the second driving end is for generating the second driving signal, the second VCC pin connection work electricity
Pressure.
2. a kind of LED switch power supply fast start circuit according to claim 1, which is characterized in that the main circuit is also
Including an overvoltage crowbar, the overvoltage crowbar includes:
One voltage-stabiliser tube, the cathode of the voltage-stabiliser tube connect the positive terminal of a third capacitor, the negative pole end connection of the third capacitor
Ground terminal；The positive terminal of the third capacitor and the induced voltage output end of auxiliary winding are connected by a first diode；
The emitter of one first triode, first triode connects the operating voltage, the current collection of first triode
Pole connects second driving signal, and the base stage of first triode passes through work described in one the 7th resistance and the 4th capacitance connection
Make voltage；
The collector of one second triode, the emitter ground connection of second triode, second triode passes through third electricity
Resistance connects the base stage of first triode；The base stage of second triode connects the voltage-stabiliser tube by one the 5th resistance
The base stage of anode, second triode passes through one the 4th resistance eutral grounding；The both ends of 4th resistance one the 7th capacitor in parallel.
3. a kind of LED switch power supply fast start circuit according to claim 2, which is characterized in that the overvoltage protection
Also circuit includes:
One third transistor, the transistor emitter connect the operating voltage, and the base stage of the third transistor passes through
The base stage of 6th resistance and the collector for being connected to the third transistor, the third pole pipe passes through the voltage-stabiliser tube and ground connection
End connection.
4. a kind of LED switch power supply fast start circuit according to claim 1, which is characterized in that further include the three or two
Pole pipe, the cathode of the third diode connect one end of the tenth resistance, the anode of the third diode and the work electricity
Pressure connection.
5. a kind of LED switch power supply fast start circuit according to claim 1, which is characterized in that the second diode
The positive D foot with DC-DC control chip is connect；The cathode of second diode passes through an eleventh resistor and the N
The grid of channel enhancement metal-oxide-semiconductor connects.
6. a kind of LED switch power supply fast start circuit according to claim 1, which is characterized in that LED drive power is opened
Machine starts the time less than 0.5S.
7. a kind of LED switch power supply fast start circuit according to claim 1, which is characterized in that first charging
Capacitor and third capacitor are electrolytic capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820969195.4U CN208768318U (en) | 2018-06-22 | 2018-06-22 | A kind of LED switch power supply fast start circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820969195.4U CN208768318U (en) | 2018-06-22 | 2018-06-22 | A kind of LED switch power supply fast start circuit |
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| Publication Number | Publication Date |
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| CN208768318U true CN208768318U (en) | 2019-04-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820969195.4U Active CN208768318U (en) | 2018-06-22 | 2018-06-22 | A kind of LED switch power supply fast start circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110602820A (en) * | 2019-08-09 | 2019-12-20 | 漳州立达信光电子科技有限公司 | Fast start system without voltage detection |
| CN112260529A (en) * | 2020-10-15 | 2021-01-22 | 西安爱科赛博电气股份有限公司 | High-voltage direct-current input switching power supply and starting auxiliary source locking method |
| CN112994437A (en) * | 2021-02-07 | 2021-06-18 | 成都方舟微电子有限公司 | Starting circuit applied to switching power supply and power integrated device |
-
2018
- 2018-06-22 CN CN201820969195.4U patent/CN208768318U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110602820A (en) * | 2019-08-09 | 2019-12-20 | 漳州立达信光电子科技有限公司 | Fast start system without voltage detection |
| EP3793328A1 (en) * | 2019-08-09 | 2021-03-17 | Xiamen Leedarson Lighting Co., Ltd. | Led quick activation system |
| CN110602820B (en) * | 2019-08-09 | 2022-01-11 | 漳州立达信光电子科技有限公司 | Fast start system without voltage detection |
| CN112260529A (en) * | 2020-10-15 | 2021-01-22 | 西安爱科赛博电气股份有限公司 | High-voltage direct-current input switching power supply and starting auxiliary source locking method |
| CN112994437A (en) * | 2021-02-07 | 2021-06-18 | 成都方舟微电子有限公司 | Starting circuit applied to switching power supply and power integrated device |
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Address after: No. 122315000 Jianlan Road, Gaoxin District, Ningbo, Zhejiang Patentee after: Ningbo sainaibi Photoelectric Technology Co.,Ltd. Address before: No.56 Keda Road, hi tech Zone, Ningbo City, Zhejiang Province, 315000 Patentee before: NINGBO SNAPPY OPTOELECTRONICS Co.,Ltd. |