CN108471240A - A kind of power converting circuit for LED drivings - Google Patents
A kind of power converting circuit for LED drivings Download PDFInfo
- Publication number
- CN108471240A CN108471240A CN201810352820.5A CN201810352820A CN108471240A CN 108471240 A CN108471240 A CN 108471240A CN 201810352820 A CN201810352820 A CN 201810352820A CN 108471240 A CN108471240 A CN 108471240A
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- CN
- China
- Prior art keywords
- diode
- capacitance
- resistance
- power
- switch pipe
- 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.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of power converting circuits for LED drivings, including：AC power, first switch pipe, second switch pipe, AC power one end are connected with the first diode cathode, and the first diode cathode is connected with one end of one end of the first capacitance, second resistance, 3rd resistor, the second capacitance and primary side winding；The power converting circuit of the present invention, component used is few, simple in structure, of low cost；It can not only realize that voltage stabilizing exports, limit the electric current of switch, prevent electric current excessive and burn, be applicable in and promote.
Description
Technical field
The present invention relates to a kind of power converting circuit more particularly to a kind of power converting circuits for LED drivings.
Background technology
It is various that there are many power converting circuits driven currently used for LED, in the prior art various power conversion electricity
Although road has the function of ability and the voltage stabilizing of certain current limit, its control mode is complicated, and reliability is difficult to ensure,
And circuit structure is complicated, cost is higher.Therefore the power supply change for having current limit capability and voltage stabilizing function of brief and practical is introduced
Circuit is changed to solve the problems, such as this right and wrong often with there is realistic meaning.
Invention content
Technical problem to be solved by the present invention lies in deficiency in the prior art is overcome, a kind of supply convertor electricity is provided
Road, circuit structure is simple, and reliability is high, and voltage stabilizing output not only may be implemented, electric current can be prevented excessive with limit switch electric current
And it burns.
The purpose of the present invention is what is be achieved through the following technical solutions：
A kind of power converting circuit, including：AC power, first switch pipe, second switch pipe, AC power one end and the
One diode D1 anodes are connected, one end of the first diode D1 cathode and the first capacitance C1, second resistance R2,3rd resistor R3,
One end of second capacitance C2 and primary side winding L1 is connected, the other end of the first capacitance C1 and one end of first resistor R1, first
The emitter of switching tube Q1, one end of the 4th resistance R4, one end of third capacitance C3 and sampling winding L2 one end be connected, the
The other end of the other end connection AC power of one resistance R1, the collector of the other end connecting triode Q1 of second resistance R2,
One end of the base stage of second switch pipe Q2, one end of zener diode D4 and the 5th resistance R5 is connected, and 3rd resistor R3's is another
One end is connected with the other end of the cathode of the first diode D2 and the second capacitance C2, and the other end of primary side winding L1 is opened with second
The anode of the collector and the second diode D2 that close pipe Q2 is connected, and the emitter of second switch pipe Q2 is with third diode D3's
The other end of anode and the 4th resistance R4 are connected, and the cathode of third diode D3 is connected with the base stage of first switch pipe Q1, the
The other end of three capacitance C3 is connected with the other end of the anode of the second diode D5 and zener diode D4, the 5th diode D5
Cathode be connected with one end of the 4th capacitance C4, the other end of the 4th capacitance C4 is connected with the other end of the 5th resistance R5.
The advantageous effects of the present invention：
1. component used in is few, simple in structure, of low cost；
2. can realize that voltage stabilizing exports, electric current can be prevented excessive and burnt with limit switch electric current；
3. it is wide to be applicable in topology, it is not only applicable in the isolated forms such as circuit of reversed excitation topology, applies also for other non-isolation types topology.
Description of the drawings
Fig. 1 is the power converting circuit figure for LED drivings of the embodiment of the present invention.
Specific implementation mode
In order to enable the objectives, technical solutions, and advantages of the present invention are more clearly understood, below in conjunction with attached drawing and its implementation
Example, the present invention will be described in further detail；It should be appreciated that specific embodiment described herein is only used for explaining this hair
It is bright, it is not intended to limit the present invention.
With reference to attached drawing 1, for a kind of power converting circuit of the present invention.
In the present embodiment, input power circuit is 220V exchange inputs, and one end is connected with two machine pipe D1 anodes, two poles
Pipe D1 cathode are connected with one end of one end of capacitance C1, resistance R2, resistance R3, capacitance C2 and primary side winding L1, capacitance C1's
The other end and one end of resistance R1, the emitter of triode Q1, one end of resistance R4, one end of capacitance C3 and sampling winding L2
One end be connected, the other end of the other end of resistance R1 connection AC power, the collection of the other end connecting triode Q1 of resistance R2
Electrode, the base stage of switching tube Q2, one end of zener diode D4 and resistance R5 one end be connected, the other end of resistance R3 and two
The cathode of pole pipe D2 and the other end of capacitance C2 are connected, the other end of primary side winding L1 and the collector and two of switching tube Q2
The anode of pole pipe D2 is connected, and the emitter of switching tube Q2 is connected with the other end of the anode of diode D3 and resistance R4, two poles
The cathode of pipe D3 is connected with the base stage of triode Q1, the other end of capacitance C3 and the anode of diode D5 and zener diode D4
The other end be connected, the cathode of diode D5 is connected with one end of capacitance C4, and the other end of C4 is connected with the other end of resistance R5.
The operation principle of power converter circuit shown in the present embodiment is as follows：Input power circuit is that 220V exchanges are defeated
Enter, one end carries out rectification by a two machine pipe D1, and diode can be selected as 4007 halfwave rectifier, and the other end passes through 10 Europe
Resistance R1 after, C filtered by 10uF capacitances C1,4 resistance R1, which are used for doing, to be protected, and leads to overcurrent if there is failure etc., then
Resistance R1 will be blown, to avoid the failure for causing bigger.
Resistance R3, capacitance C2, diode D2 constitute a high pressure absorbing circuit, and when switching tube Q2 is turned off, which inhales
It receives circuit and is responsible for the induced voltage on absorbing coil, caused punch through to prevent high pressure to be added on switching tube Q2.
Switching tube Q2 is switching tube, and pressure-resistant 400V, maximum collector currnt 1.5A, maximum collector power consumption is 14W, is used for
Control the switching between primary side winding and power supply.When primary side winding ceaselessly break-make, will be formed in switch transformer TR
Changing magnetic field, to generate induced voltage in secondary windings.Power supply is inverse excitation type converter (not shown).
R2 is start-up resistor, and resistance value is 510K Ω, and the base current of startup is provided to switching tube Q2.Below switching tube Q2
Resistance R4 be current sampling resistor, resistance value is taken as 10 Europe, becomes voltage (its value is 10*I), voltage warp after electric current is sampled
After diode D3, add in the base stage of triode Q1.When sampling voltage is approximately greater than 1.4V, i.e. switching tube Q2 electric currents are more than
When 0.14A, triode Q1 conductings, to which collector current reduces, thus limit to drag down the base voltage of switching tube Q2
The electric current for having made switch prevents electric current excessive and burns that (this is a constant current structure in fact, and the maximum current of switching tube is limited
In 140mA or so).
The winding of transformer lower left samples the rectified diode D4 rectifications of induced voltage of winding L2, capacitance C3 filters
Sampling voltage is formed after wave.Triode Q1 emitters one end is taken to be ground.Sampling voltage is bears (- 4V or so), and output voltage
When higher, sampled voltage is more negative.Sampling voltage adds to the base stage of switching tube Q1 after 6.2V zener diodes D4.Work as output
When voltage is higher, then sampling voltage is more negative, after bearing to a certain extent, 6.2V zener diodes are breakdown, to open
The base potential for closing pipe Q2 drags down, this will cause switching tube Q2 to disconnect or postpone the conducting of switch, defeated to control energy
Enter into transformer, also just control the raising of output voltage, realizes the function of voltage stabilizing output.And the 1K Ω resistance R5 of lower section
Then it is positive feedback branch with concatenated 2700pF capacitances C4, constitutes oscillating maintaining circuit, induced electricity is taken out from sampling winding
Pressure, is added in the base stage of switching tube Q2, to maintain to vibrate.The secondary windings L3 on the right is through diode D6 rectifications, 220uF capacitances C5
The voltage of 6V is exported after filtering.Diode D6 is fast quick-recovery pipe, such as Schottky diode etc., because of the work of Switching Power Supply
Frequency is higher, so needing the diode of working frequency.The Schottky diodes generation such as common 1N5816,1N5817 may be used
It replaces.Equally because of the high reason of frequency, for transformer TR it is necessary that with high frequency switch transformer, iron core is generally high frequency ferrite
Magnetic core has high resistivity, to reduce vortex.
The present invention power converting circuit the characteristics of be：Component used is few, simple in structure, of low cost；It can not only be real
Existing voltage stabilizing output, limits the electric current of switch, prevents electric current excessive and burn；It is wide to be applicable in topology, is not only applicable in circuit of reversed excitation etc.
Isolated form topology applies also for other non-isolation types topology.
The present invention is illustrated by specific implementation process, without departing from the present invention, can be with
Various transformation and same replacement are carried out to patent of the present invention, therefore patent of the present invention is not limited to disclosed specific implementation
Journey, and should include the whole embodiments fallen into scope of the patent claims of the present invention, the scope of the present invention is by appended power
Profit requires rather than description indicates, and all changes in the meaning and scope of equivalent be intended to by comprising.
Claims (1)
1. a kind of power converting circuit for LED drivings, including：AC power, first switch pipe, second switch pipe, exchange
Power supply one end is connected with the first diode cathode, one end of the first diode cathode and the first capacitance, second resistance, third electricity
One end of resistance, the second capacitance and primary side winding is connected, the other end of the first capacitance and one end of first resistor, first switch pipe
Emitter, one end of the 4th resistance, one end of third capacitance and sample winding one end be connected, the other end of first resistor
Connect the other end of AC power, the other end connection collector of first switch pipe of second resistance, the base stage of second switch pipe,
One end of zener diode and one end of the 5th resistance are connected, the cathode of the other end of 3rd resistor and the first diode and
The other end of second capacitance is connected, the other end of primary side winding and the collector of second switch pipe and the anode of the second diode
It is connected, the emitter of second switch pipe is connected with the other end of the anode of third diode and the 4th resistance, third diode
Cathode be connected with the base stage of the first triode, the anode and zener diode of the other end of third capacitance and the second diode
The other end be connected, the cathode of the 5th diode is connected with one end of the 4th capacitance, the other end and the 5th resistance of the 4th capacitance
The other end be connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810352820.5A CN108471240A (en) | 2018-04-19 | 2018-04-19 | A kind of power converting circuit for LED drivings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810352820.5A CN108471240A (en) | 2018-04-19 | 2018-04-19 | A kind of power converting circuit for LED drivings |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108471240A true CN108471240A (en) | 2018-08-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810352820.5A Pending CN108471240A (en) | 2018-04-19 | 2018-04-19 | A kind of power converting circuit for LED drivings |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108471240A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87101895A (en) * | 1986-03-14 | 1987-09-23 | 三菱电机株式会社 | Self excited blocking oscillation type dc converter |
| CN201150031Y (en) * | 2007-12-21 | 2008-11-12 | 毛灿豪 | Switch power supply |
-
2018
- 2018-04-19 CN CN201810352820.5A patent/CN108471240A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87101895A (en) * | 1986-03-14 | 1987-09-23 | 三菱电机株式会社 | Self excited blocking oscillation type dc converter |
| CN201150031Y (en) * | 2007-12-21 | 2008-11-12 | 毛灿豪 | Switch power supply |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180831 |
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| RJ01 | Rejection of invention patent application after publication |