CN107124113A - A kind of transless constant current output Switching Power Supply - Google Patents
A kind of transless constant current output Switching Power Supply Download PDFInfo
- Publication number
- CN107124113A CN107124113A CN201710494376.6A CN201710494376A CN107124113A CN 107124113 A CN107124113 A CN 107124113A CN 201710494376 A CN201710494376 A CN 201710494376A CN 107124113 A CN107124113 A CN 107124113A
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- China
- Prior art keywords
- power supply
- pin
- constant current
- positive
- transless
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/2176—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only comprising a passive stage to generate a rectified sinusoidal voltage and a controlled switching element in series between such stage and the output
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention belongs to switch power technology field, and in particular to a kind of transless constant current output Switching Power Supply.The transless constant current output Switching Power Supply, including BX cartridge fuses, the BX cartridge fuses are connected on the input of the electric input circuit rectifying full bridge of mains；D1 D4 are rectifying full bridge, out-put supply positive and negative electrode；D5 positive poles connect the positive source of full-bridge output, and D5 negative poles connect R1 one end, R1 another termination DZ negative pole, C1 positive poles, IC 8 pin and R4 one end；The positive source of the termination full-bridge outputs of R2 mono-, one end of R2 another termination IC 2 pin, 6 pin and RP1.Its advantage is：Overcome the monopolization of conventional dedicated chip technology, the drawbacks of cost is higher, circuit is complicated, power factor PF values are low, the present invention looks for another way, be provided with low cost, good reliability, power factor PF values it is high, it is suitable produce in batches, it is easy to utilize the characteristics of.
Description
Technical field
The invention belongs to switch power technology field, and in particular to a kind of transless constant current output Switching Power Supply.
Background technology
Visible LED is illuminated and camera Infrared LED illumination actuation techniques, as city intelligent railway and highway system is built
An important component as wisdom traffic total solution.Because LED is that an electric current is sensitive with voltage change
Nonlinear device, the minor variations of its forward voltage can cause the great changes of forward current, and LED semiconductor devices PN junction is positive
After conducting, junction voltage VF rises and declined with environment and operating temperature, i.e.,：- 2mv/ DEG C, the referred to as negative temperature effect of PN junction, LED
Life-span and luminance decay it is directly related with the stability of driving current, determine LED performance and the core in life-span be
Constant current driver circuit for LED, when LED radiatings are bad causes temperature to raise, its operating current can also have obvious liter compared with the starting stage
Height, this is also LED illumination product and the main cause of camera infrared illumination LED quick agings on the market.For type voltage regulation LED
For driving power supply, when temperature peak load changes, electric current increase is larger, and LED is more than the rated operational current long period
When can damage；Therefore, constant current mode driving power supply is more satisfactory LED type of drive.Usual LED can use special driving first
The constant-current source driving of chip, for now, the LED drive power of PWM control modes design is commonplace and widely used
Scheme, although the conversion efficiency of this Switching Power Supply is higher, and output is stable, but exist special chip technical monopoly,
The problem of cost is higher, circuit is complicated, power factor PF values are low.
The content of the invention
There is provided a kind of transless constant current output Switching Power Supply for the defect that makes up prior art by the present invention.
The present invention is achieved through the following technical solutions：
A kind of transless constant current output Switching Power Supply, including BX cartridge fuses, the BX cartridge fuses, are connected on mains electricity defeated
The input of entry loop rectifying full bridge；D1-D4 is rectifying full bridge, out-put supply positive and negative electrode；D5 positive poles connect the power supply of full-bridge output
Positive pole, D5 negative poles connect R1 one end, R1 another termination DZ negative pole, C1 positive poles, IC 8 pin and R4 one end；R2 mono- is terminated
The positive source of full-bridge output, one end of R2 another termination IC 2 pin, 6 pin and RP1；RP1 another termination power cathode；
DZ positive pole, C1 negative pole connect the negative pole of power supply；A R3 termination positive source, another termination MOSFET VT drain D, VT
R5 of the grid G by series connection connect IC 3 pin；IC 1 pin connects power cathode, and IC 5 pin connect power cathode, IC 4 pin through C2
RP2 sliding end is connect, IC 7 pin connect VD negative pole；VD positive pole connects the R4 other end；VT source S meets R6 one end, C3
The positive pole of positive pole, CRD；R6 another termination RP2 one end, RP2 another termination power cathode；C3 negative pole connects power supply and born
Pole, CRD negative pole connects load LED positive pole, and load LED negative pole connects power cathode.
Further, the BX cartridge fuses are 0.5A-1A cartridge fuses；D1-D4 is 1A/1000V rectifying full bridges；D5 is 1N4007
Rectification isolating diode；DZ is 0.5W/5V-13V voltage-regulator diodes；VD is that light emitting diode makees power supply instruction.
Further, the R1 is 40K Ω -80K Ω dropping resistors；R2 is city's electro-detection divider resistance, and resistance is 120K
Ω-420KΩ；R3 is 0.2 Ω -- 2 Ω current-limiting resistances；R4 is VD current-limiting resistance, and resistance is 3 K of K Ω -6.2 Ω；R5 is
3K Ω -- 21K Ω current-limiting resistances；R6 is feedback divider resistance, and resistance is 5.1K Ω -- 22K Ω.
Further, the C1 is the 47 μ F/50V low-voltage filter electric capacity of μ F/50V -1000；C2 is 0.01 μ F anti-interference capacitors；
C3 is 3300 μ F -1F large bulk capacitances；RP1 is 10 K Ω -- 33 K Ω partial pressures turn on adjustable resistance, and RP2 is 100K Ω --
470K Ω DC low-voltages export adjustable resistance.
Further, the IC is time-base integrated circuit EN555 or NE7555.
Further, the VT is switch mosfet FET, can select IRF342；CRD is constant current tube, and constant current value can root
Determined the need for operating current according to load LED, such as 20mA--100mA；LED is load, as needed by LED particle series connection simultaneously
Connection is combined.
The beneficial effects of the invention are as follows：A kind of transless constant current output Switching Power Supply of the present invention overcomes conventional dedicated core
The drawbacks of chip technology is monopolized, cost is higher, circuit is complicated, power factor PF values are low, the present invention looks for another way, and is provided with cost low
Honest and clean, good reliability, power factor PF values are high, be adapted to batch production, it is easy to utilize the characteristics of.
Brief description of the drawings
The present invention is further illustrated below in conjunction with the accompanying drawings.
Accompanying drawing 1 is circuit theory schematic diagram of the invention.
Embodiment
Accompanying drawing 1 is a kind of specific embodiment of the invention.A kind of transless constant current output Switching Power Supply of the invention, including
BX cartridge fuses, the BX cartridge fuses are connected on the input of the electric input circuit rectifying full bridge of mains；D1-D4 is that rectification is complete
Bridge, out-put supply positive and negative electrode；D5 positive poles connect the positive source of full-bridge output, and D5 negative poles connect R1 one end, R1 another termination DZ
Negative pole, C1 positive poles, IC 8 pin and R4 one end；The positive source of the termination full-bridge outputs of R2 mono-, the 2 of R2 another termination IC
One end of pin, 6 pin and RP1；RP1 another termination power cathode；DZ positive pole, C1 negative pole connect the negative pole of power supply；The one of R3
Termination power positive pole, another termination MOSFET VT drain D, VT grid G connects IC 3 pin by the R5 connected；IC 1 pin
Power cathode is connect, IC 5 pin connect power cathode through C2, and IC 4 pin connect RP2 sliding end, and IC 7 pin connect VD negative pole；VD's
Positive pole connects the R4 other end；VT source S connects R6 one end, C3 positive pole, CRD positive pole；The one of R6 another termination RP2
End, RP2 another termination power cathode；C3 negative pole connects power cathode, and CRD negative pole connects load LED positive pole, loads LED
Negative pole connect power cathode.
Further, the BX cartridge fuses are 0.5A-1A cartridge fuses；D1-D4 is 1A/1000V rectifying full bridges；D5 is 1N4007
Rectification isolating diode；DZ is 0.5W/5V-13V voltage-regulator diodes；VD is that light emitting diode makees power supply instruction.
Further, the R1 is 40K Ω -80K Ω dropping resistors；R2 is city's electro-detection divider resistance, and resistance is 120K
Ω-420KΩ；R3 is 0.2 Ω -- 2 Ω current-limiting resistances；R4 is VD current-limiting resistance, and resistance is 3 K of K Ω -6.2 Ω；R5 is
3K Ω -- 21K Ω current-limiting resistances；R6 is feedback divider resistance, and resistance is 5.1K Ω -- 22K Ω.
Further, the C1 is the 47 μ F/50V low-voltage filter electric capacity of μ F/50V -1000；C2 is 0.01 μ F anti-interference capacitors；
C3 is 3300 μ F -1F large bulk capacitances；RP1 is 10 K Ω -- 33 K Ω partial pressures turn on adjustable resistance, and RP2 is 100K Ω --
470K Ω DC low-voltages export adjustable resistance.
Further, the IC is time-base integrated circuit EN555 or NE7555.
Further, the VT is switch mosfet FET, can select IRF342；CRD is constant current tube, and constant current value can root
Determined the need for operating current according to load LED, such as 20mA--100mA；LED is load, as needed by LED particle series connection simultaneously
Connection is combined.
A kind of transless constant current output Switching Power Supply of the invention, it is when using that 220V electric mains is whole first by D1-D4
Full-bridge rectification is flowed, l00Hz pulsating dc voltage is obtained, its peak-peak is up to 310V, time base circuit IC and its peripheral capacitance-resistance
Part constitutes civil power Super-zero control circuit, and by the mechanical periodicity of control electric circuit inspection civil power, Rectified alternating current is isolated through D5, R1 drops
Pressure, DZ voltage stabilizings, C1 filtering, stable working power, R2, RP1 composition city's electro-detection partial pressure electricity are provided for detection control IC circuit
Road, using the electronic switching of VT switch mosfet FETs, when civil power is near zero-crossing point, switch mosfet
Effect pipe is closed；By the partial pressure value for adjusting setting RP1 and R2 so that civil power is in a certain voltage value, switch mosfet
Effect pipe can be turned on, and charging storage electric energy is carried out to large bulk capacitance C3；Rectified alternating current is fast to C3 by VT through R3 current limlitings
Speed charging.When Rectified alternating current zero passage voltage is less than setting value, IC the 2nd pin is triggered, the 3rd pin output high level,
Switch mosfet FET VT is turned on；When IC the 4th pin voltage is more than 0.7V, IC is to be reset, the 3rd pin output low level,
VT ends；R6, RP2 and IC the 4th pin composition Voltage Feedback control circuit, regulation RP2 can obtain specific DC low-voltage output,
In addition to the time that VT is turned on, large bulk capacitance C3 is kept to load output current, and R4, VD are power supply indicating circuit, due to IC the 7th
The conducting of transistor is staggered with the 3rd pin output high level in pin, and this just alleviates the power consumption of control circuit, it is ensured that control circuit
The reliability of work, IC the 2nd pin and the 6th pin are common to city's electro-detection so that circuit has overvoltage blocking function, using big
The discharge and recharge of capacity, it is ensured that exported to loading the DC low-voltage with certain power, output DC voltage can basis
LED and constant current tube CRD need of work is loaded, is set by adjusting RP2.
The present invention is not limited to the above-described embodiments, anyone should learn the present invention enlightenment under make with the present invention
With same or like technical scheme, each fall within protection scope of the present invention.
The technology of the invention not being described in detail, shape, construction part are known technology.
Claims (6)
1. a kind of transless constant current output Switching Power Supply, including BX cartridge fuses, it is characterised in that the BX cartridge fuses, series connection
In the input of the electric input circuit rectifying full bridge of mains；D1-D4 is rectifying full bridge, out-put supply positive and negative electrode；D5 positive poles connect
The positive source of full-bridge output, D5 negative poles connect R1 one end, R1 another termination DZ negative pole, C1 positive poles, IC 8 pin and R4
One end；The positive source of the termination full-bridge outputs of R2 mono-, one end of R2 another termination IC 2 pin, 6 pin and RP1；RP1's is another
Termination power negative pole；DZ positive pole, C1 negative pole connect the negative pole of power supply；A R3 termination positive source, another termination MOSFET
VT drain D, VT grid G connects IC 3 pin by the R5 connected；IC 1 pin connects power cathode, and IC 5 pin connect power supply through C2
Negative pole, IC 4 pin connect RP2 sliding end, and IC 7 pin connect VD negative pole；VD positive pole connects the R4 other end；VT source S connects
R6 one end, C3 positive pole, CRD positive pole；R6 another termination RP2 one end, RP2 another termination power cathode；C3's
Negative pole connects power cathode, and CRD negative pole connects load LED positive pole, and load LED negative pole connects power cathode.
2. a kind of transless constant current output Switching Power Supply according to claim 1, it is characterized in that：The BX cartridge fuses are
0.5A-1A cartridge fuses；D1-D4 is 1A/1000V rectifying full bridges；D5 is 1N4007 rectification isolating diodes；DZ is 0.5W/5V-
13V voltage-regulator diodes；VD is that light emitting diode makees power supply instruction.
3. a kind of transless constant current output Switching Power Supply according to claim 1, it is characterized in that：The R1 is 40K
Ω -80K Ω dropping resistors；R2 is city's electro-detection divider resistance, and resistance is 120K Ω -420K Ω；R3 is 0.2 Ω -- 2 Ω are limited
Leakage resistance；R4 is VD current-limiting resistance, and resistance is 3 K of K Ω -6.2 Ω；R5 is 3K Ω -- 21K Ω current-limiting resistances；R6 is feedback
Divider resistance, resistance is 5.1K Ω -- 22K Ω.
4. a kind of transless constant current output Switching Power Supply according to claim 1, it is characterized in that：The C1 is 47 μ F/
The μ F/50V low-voltage filter electric capacity of 50V -1000；C2 is 0.01 μ F anti-interference capacitors；C3 is 3300 μ F -1F large bulk capacitances；RP1
For 10 K Ω -- 33 K Ω partial pressures turn on adjustable resistance, and RP2 is 100K Ω -- and 470K Ω DC low-voltages export adjustable resistance.
5. a kind of transless constant current output Switching Power Supply according to claim 1, it is characterized in that：The basis set when IC is
Into circuit EN555 or NE7555.
6. a kind of transless constant current output Switching Power Supply according to claim 1, it is characterized in that：The VT is MOSFET
Switched field effect pipe, can select IRF342；CRD is constant current tube, constant current value can according to the need for load LED operating current really
It is fixed, such as 20mA--100mA；LED is load, is combined as needed by LED particle series and parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710494376.6A CN107124113A (en) | 2017-06-26 | 2017-06-26 | A kind of transless constant current output Switching Power Supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710494376.6A CN107124113A (en) | 2017-06-26 | 2017-06-26 | A kind of transless constant current output Switching Power Supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107124113A true CN107124113A (en) | 2017-09-01 |
Family
ID=59718718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710494376.6A Withdrawn CN107124113A (en) | 2017-06-26 | 2017-06-26 | A kind of transless constant current output Switching Power Supply |
Country Status (1)
| Country | Link |
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| CN (1) | CN107124113A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108667480A (en) * | 2018-04-26 | 2018-10-16 | 珠海锐视保科技有限公司 | Onboard system |
| CN108683973A (en) * | 2018-04-26 | 2018-10-19 | 珠海锐视保科技有限公司 | Vehicle-mounted monitoring system |
| CN110677061A (en) * | 2019-09-30 | 2020-01-10 | 徐州柏兴电子有限公司 | Voltage stabilizing circuit of power-supply-free transformer |
| CN114578739A (en) * | 2022-03-15 | 2022-06-03 | 湖南省通达文电磁设备有限公司 | Direct-current voltage stabilizing circuit utilizing alternating-current trough energy and working method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102412742A (en) * | 2011-12-13 | 2012-04-11 | 洪珍 | Switching power supply without supply transformer |
| JP2012079578A (en) * | 2010-10-04 | 2012-04-19 | Fdk Corp | Power supply device for led parallel driving |
-
2017
- 2017-06-26 CN CN201710494376.6A patent/CN107124113A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012079578A (en) * | 2010-10-04 | 2012-04-19 | Fdk Corp | Power supply device for led parallel driving |
| CN102412742A (en) * | 2011-12-13 | 2012-04-11 | 洪珍 | Switching power supply without supply transformer |
Non-Patent Citations (1)
| Title |
|---|
| 佚名: "无电源变压器电源电路图", 《HTTPS://WWW.ELECFANS.COM/DIANLUTU/DIANYUANDIANLU/200805029055.HTML》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108667480A (en) * | 2018-04-26 | 2018-10-16 | 珠海锐视保科技有限公司 | Onboard system |
| CN108683973A (en) * | 2018-04-26 | 2018-10-19 | 珠海锐视保科技有限公司 | Vehicle-mounted monitoring system |
| CN110677061A (en) * | 2019-09-30 | 2020-01-10 | 徐州柏兴电子有限公司 | Voltage stabilizing circuit of power-supply-free transformer |
| CN114578739A (en) * | 2022-03-15 | 2022-06-03 | 湖南省通达文电磁设备有限公司 | Direct-current voltage stabilizing circuit utilizing alternating-current trough energy and working method |
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20170901 |