CN208300086U - A kind of low-power consumption LED power - Google Patents
A kind of low-power consumption LED power Download PDFInfo
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- CN208300086U CN208300086U CN201820986857.9U CN201820986857U CN208300086U CN 208300086 U CN208300086 U CN 208300086U CN 201820986857 U CN201820986857 U CN 201820986857U CN 208300086 U CN208300086 U CN 208300086U
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- 239000003990 capacitor Substances 0.000 claims abstract description 37
- 239000004065 semiconductor Substances 0.000 claims abstract description 14
- 230000005611 electricity Effects 0.000 claims 2
- 238000000034 method Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
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Abstract
A kind of low-power consumption LED power, including rectification circuit, filter circuit, control circuit, transformer and the output circuit being sequentially connected, rectification circuit input end connects alternating current, reversed current feed circuit between output circuit and control circuit；Control circuit includes chip SP5875P/F, the both ends resistance R4 connect 8 foot of transformer primary coils positive input and chip respectively, ancillary coil positive input is connected with the anode of diode D5, diode D5 cathode, resistance R3 and 6 foot of chip are sequentially connected, and the both ends capacitor C3 connect 6 foot of chip and ground terminal respectively；2 foot of chip connects feedback circuit output；3 foot of chip connects metal-oxide-semiconductor source electrode, and 5 foot of chip, resistance R6 and metal-oxide-semiconductor grid are sequentially connected, and metal-oxide-semiconductor drain electrode connects primary coils negative input；Primary coils positive input, resistance R7 and diode D6 cathode are sequentially connected, and diode D6 anode connects primary coils negative input, and capacitor C5 is attempted by the both ends resistance R7.The utility model is worked by built-in current source start-up circuit, reduces electric energy loss.
Description
Technical field
The utility model relates to power technique fields, especially a kind of low-power consumption LED power.
Background technique
With the development of LED industry, the LED technologies such as area source are gradually mature, be widely used in automobile, medical treatment,
Multiple industries such as agricultural, optic communication have been increasingly becoming worldwide mainstream lighting engineering.In the use process of LED, drive
Dynamic power supply is the guarantee of LED steady operation, and therefore, the LED industry of mainstream extremely values the technology development of LED power.
As energy conservation and environmental protection is just gradually becoming a kind of trend, the low-power consumption of LED power also becomes increasingly to weigh with high efficiency
It wants, traditional pwm chip has been difficult to meet increasingly exacting terms.Existing LED power, start-up circuit are in height
It presses and accesses a big valued resistor between input terminal and the power supply foot for controlling chip, be control chip power supply foot using the resistance
Capacitor charging is worked with start-up circuit.But after circuit normal work, which is still within working condition,
Electric energy is persistently consumed, circuit loss is undoubtedly increased, wastes electric energy.
Utility model content
The utility model provides a kind of low-power consumption LED power, is worked by the current source of built-in chip type with start-up circuit, drop
Low electric energy loss.
The utility model provides a kind of low-power consumption LED power, including the rectification circuit, filter circuit, control being sequentially connected
Circuit, transformer and output circuit, the rectification circuit input terminal for connecing alternating current, the output circuit and control circuit
Between also access have feed circuit；The control circuit includes chip SP5875P/F, and the both ends resistance R4 connect transformer main respectively
8 foot of positive input and chip of coil, the positive input of ancillary coil are connected with the anode of diode D5, diode D5's
Cathode, resistance R3 and 6 foot of chip are sequentially connected, and the both ends of capacitor C3 connect 6 foot of chip and ground terminal respectively；The reversed feedback of 2 foot of chip
The output end of circuit；3 foot of chip connects metal-oxide-semiconductor source electrode, and 5 foot of chip, resistance R6 and metal-oxide-semiconductor grid are sequentially connected, and metal-oxide-semiconductor drain electrode connects
The negative input of primary coils；The cathode of the positive inputs of primary coils, resistance R7 and diode D6 is sequentially connected, two poles
The anode of pipe D6 connects the negative input of primary coils, and capacitor C5 is attempted by the both ends resistance R7.
Preferably, the feed circuit includes photoelectrical coupler, positive output end, resistance R10 and the photoelectricity of output circuit
The positive input of coupler is sequentially connected, positive output 2 foot of chip termination of the photoelectrical coupler, the photoelectrical coupler
Negative sense output end ground connection.
Preferably, the feed circuit further includes source of stable pressure TL431, and the both ends resistance R11 are connecing photoelectrical coupler just respectively
To input terminal and negative input, 3 feet of source of stable pressure TL431 connect the negative input of photoelectrical coupler, and the 2 of source of stable pressure TL431
Foot connects the negative sense output end of output circuit, and access has resistance R12 between 1 foot and 3 feet of source of stable pressure TL431, source of stable pressure TL431's
Access has resistance R14 between 1 foot and 2 feet.
Preferably, the rectification circuit is bridge rectifier, the positive output termination filtering of the bridge rectifier
Circuit, the negative sense output end ground connection of the bridge rectifier.
Preferably, the filter circuit includes filter capacitor C2, and the both ends of filter capacitor C2 are connecing primary coils just respectively
To input terminal and ground terminal.
Preferably, be also serially connected with protection circuit between the alternating current and rectification circuit, the protection circuit include resistance R1,
Resistance R2 and capacitor CX1, the firewire of alternating current, resistance R1, resistance R2 and alternating current zero curve be sequentially connected, the both ends point of capacitor CX1
The firewire and zero curve of alternating current are not connect.
Preferably, the output circuit includes diode D7 and capacitor C6, and transformer forward direction is exporting terminating diode D7 just
Pole, diode D7 cathode LED power forward direction output end, the both ends capacitor C6 connect LED power forward direction output end respectively and LED power is negative
To output end.
In the utility model, chip SP5875P/F is built-in with high-voltage current source, when circuit starts starting, internal height
Current voltage source is capacitor C3 charging, and the initial stage of charging, capacitor is applied to the voltage very little of 6 foot of chip, and current source will at this time
The starting current of about 1mA is provided, in the process, the starting current of chip only has about 100uA, then most starting current is used
Come for capacitor C3 charging.After capacitor C3 is charged to predetermined voltage, chip SP5875P/F starts to work, at this time high voltage startup
Current source is closed, and 6 foot of chip is powered to ancillary coil, and since big resistance is not used, there is no resistance persistently to consume electric energy, just
Reduce the power consumption in start-up course.And in this Starting mode, due to passing through internal current source self-exciting starting, input
Influence very little of the height of voltage for system start-up time, stability is higher when system starts.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the low-power consumption LED power of embodiment of the utility model.
Specific embodiment
The utility model is described in further detail below by specific embodiment combination attached drawing.
The utility model embodiment provides a kind of low-power consumption LED power, as shown in Figure 1 comprising the rectification being sequentially connected
Circuit 1, filter circuit 2, control circuit 3, transformer 4 and output circuit 5, the input terminal of the rectification circuit are used to connect alternating current,
Alternating current is converted to direct current.Filter circuit 2 then filters out impurity wave, makes the pure stable direct current signal of circuit output.Transformation
Device 4 carries out transformation output, voltage value needed for making voltage output load.Output circuit 5 has the final output end of LED power
Mouthful, including positive output port and negative sense output port, for load connection.Between the output circuit 5 and control circuit 3
Also access has feed circuit 5, and the voltage signal that output circuit 5 exports is fed back to control circuit 3 by feed circuit 5.Transformer 4 has
There are primary coils, ancillary coil and secondary coil, as input, secondary coil is then used as defeated for host coil and ancillary coil
Out.
Wherein, the control circuit 3 includes chip SP5875P/F (hereinafter referred chip), and the both ends resistance R4 connect change respectively
8 foot of positive input and chip of 4 primary coils of depressor, the positive input of ancillary coil are connected with the anode of diode D5,
Cathode, resistance R3 and 6 foot of chip of diode D5 is sequentially connected, and the both ends of capacitor C3 connect 6 foot of chip and ground terminal respectively；Chip
The output end of the reversed current feed circuit 6 of 2 feet；3 foot of chip connects metal-oxide-semiconductor source electrode, and 5 foot of chip, resistance R6 and metal-oxide-semiconductor grid are sequentially connected,
Metal-oxide-semiconductor, which drains, connects the negative input of primary coils；The cathode of the positive inputs of primary coils, resistance R7 and diode D6 is suitable
Secondary to be connected, the anode of diode D6 connects the negative input of primary coils, and capacitor C5 is attempted by the both ends resistance R7.
Chip uses mode PWM controlled mode, samples primary current by the port CS of 3 feet, metal-oxide-semiconductor electric current is by even
Connect the sample resistance R9 detection on 3 feet.The PWM duty cycle of chip is common by the voltage on the voltage and COMP on sample resistance
It determines.The feedback signal of feed circuit 5 inputs 6 foot of chip, PWM comparator is eventually transferred to, to change the frequency of PWM, PWM wave
Shape is finally exported from 5 feet, is controlled metal-oxide-semiconductor periodicity on-off, is formed stable switching signal.
6 feet of chip are built-in with high-voltage current source, and voltage reaches 32V.When circuit starts starting, internal high-voltage current source
For capacitor C3 charging, the initial stage of charging, capacitor is applied to the voltage very little of 6 foot of chip, and current source will provide about 1mA at this time
Starting current, in the process, the starting current of chip only has about 100uA, then most starting current is used to be capacitor
C3 charging.After capacitor C3 is charged to predetermined voltage, chip SP5875P/F starts to work, and high voltage startup current source closes at this time
It closes, 6 foot of chip is powered to ancillary coil, and since big resistance is not used, there is no resistance persistently to consume electric energy, just reduces and opens
Power consumption during dynamic.And in this Starting mode, due to passing through internal current source self-exciting starting, the height of input voltage
The low influence very little for system start-up time, stability is higher when system starts.
In one embodiment, the feed circuit 6 includes photoelectrical coupler, and photoelectrical coupler uses PC817 in figure,
For tool there are two input terminal and two output ends, the forward direction of the positive output end of output circuit 5, resistance R10 and photoelectrical coupler is defeated
Enter end to be sequentially connected, positive output 2 foot of chip termination of the photoelectrical coupler, the negative sense of the photoelectrical coupler exports termination
Ground.To guarantee feedback signal to chip feedback voltage signal by photoelectrical coupler to enhance the anti-interference ability of feedback signal
Stablize transmission.
Further, the feed circuit 6 further includes source of stable pressure TL431, and the both ends resistance R11 connect photoelectrical coupler respectively
Positive input and negative input, then the voltage value of feedback signal is the voltage value at the both ends resistance R11.The 3 of source of stable pressure TL431
Foot connects the negative input of photoelectrical coupler, and 2 feet of source of stable pressure TL431 meet the negative sense output end of output circuit, source of stable pressure TL431
1 foot and 3 feet between access have resistance R12, between 1 foot and 2 feet of source of stable pressure TL431 access have resistance R14.Pass through resistance
The ratio of R12 and resistance R14, the voltage value of adjustable source of stable pressure TL431, due to loading in resistance R10, R11 and source of stable pressure
On voltage be output circuit 5 export voltage value, when the voltage on source of stable pressure TL431 is controllable, the voltage at the both ends resistance R11
Controllably, so as to adjust the required voltage signal fed back according to the control to source of stable pressure, to implement more accurate Voltage Feedback
Control.
In one embodiment, the rectification circuit 1 be bridge rectifier, the positive input of bridge rectifier and
Negative input connects alternating current, the positive output termination filter circuit 2 of the bridge rectifier, the bridge rectifier respectively
Negative sense output end ground connection.
Further, the filter circuit includes filter capacitor C2, and the both ends of filter capacitor C2 connect primary coils respectively
Positive input and ground terminal, filter capacitor C2 can keep direct current output with the AC portion in filtering circuit.
In one embodiment, protection circuit 7, the protection circuit 7 are also serially connected between the alternating current and rectification circuit
Including resistance R1, resistance R2 and capacitor CX1, the firewire of alternating current, resistance R1, resistance R2 and alternating current zero curve be sequentially connected, capacitor
The both ends of CX1 connect the firewire and zero curve of alternating current respectively.As capacitor is protected, resistance R1 and resistance R2 can be pressure-sensitive capacitor CX1
Resistance, when alternating current generates surge current, resistance R1 and resistance R2 can make surge current pass through capacitor CX1 with limit inrush currents
It backflows to primary circuit, has the function of inhibiting surge well.
In one embodiment, the output circuit 5 includes diode D7 and capacitor C6, transformer forward direction output termination two
Pole pipe D7 anode, diode D7 cathode LED power forward direction output end, the both ends capacitor C6 connect respectively LED power forward direction output end and
LED power negative sense output end.Output circuit will be filtered voltage device output signal, so that LED power forward direction output end vo
Voltage signal between end and the end RTN is more stable.
The above content is combine specific embodiment further detailed description of the utility model, and it cannot be said that
The specific implementation of the utility model is only limited to these instructions.For the utility model person of an ordinary skill in the technical field
For, without departing from the concept of the premise utility, a number of simple deductions or replacements can also be made.
Claims (7)
1. a kind of low-power consumption LED power, it is characterised in that:
Including rectification circuit, filter circuit, control circuit, transformer and the output circuit being sequentially connected, the rectification circuit
Input terminal is for connecing alternating current, and also access has feed circuit between the output circuit and control circuit；The control circuit includes
The both ends chip SP5875P/F, resistance R4 connect 8 foot of positive input and chip of transformer primary coils respectively, ancillary coil
Positive input is connected with the anode of diode D5, and cathode, resistance R3 and 6 foot of chip of diode D5 is sequentially connected, capacitor C3
Both ends connect 6 foot of chip and ground terminal respectively；The output end of the reversed current feed circuit of 2 foot of chip；3 foot of chip connects metal-oxide-semiconductor source electrode, chip
5 feet, resistance R6 and metal-oxide-semiconductor grid are sequentially connected, and metal-oxide-semiconductor, which drains, connects the negative input of primary coils；The forward direction of primary coils
The cathode of input terminal, resistance R7 and diode D6 is sequentially connected, and the anode of diode D6 connects the negative input of primary coils, electricity
Hold C5 and is attempted by the both ends resistance R7.
2. LED power according to claim 1, it is characterised in that:
The feed circuit includes photoelectrical coupler, the forward direction of the positive output end of output circuit, resistance R10 and photoelectrical coupler
Input terminal is sequentially connected, positive output 2 foot of chip termination of the photoelectrical coupler, the negative sense output end of the photoelectrical coupler
Ground connection.
3. LED power according to claim 2, it is characterised in that:
The feed circuit further includes source of stable pressure TL431, and the both ends resistance R11 connect the positive input of photoelectrical coupler respectively and bear
To input terminal, 3 feet of source of stable pressure TL431 connect the negative input of photoelectrical coupler, and 2 feet of source of stable pressure TL431 connect output circuit
Negative sense output end, between 1 foot and 3 feet of source of stable pressure TL431 access have resistance R12, between 1 foot and 2 feet of source of stable pressure TL431
Access has resistance R14.
4. LED power according to claim 1-3, it is characterised in that:
The rectification circuit is bridge rectifier, the positive output termination filter circuit of the bridge rectifier, the bridge
The negative sense output end of formula rectification circuit is grounded.
5. LED power according to claim 1-3, it is characterised in that:
The filter circuit includes filter capacitor C2, and the both ends of filter capacitor C2 connect the positive input of primary coils respectively and connect
Ground terminal.
6. LED power according to claim 1-3, it is characterised in that:
Protection circuit is also serially connected between the alternating current and rectification circuit, the protection circuit includes resistance R1, resistance R2 and electricity
Hold CX1, the firewire of alternating current, resistance R1, resistance R2 and alternating current zero curve be sequentially connected, the both ends of capacitor CX1 connect alternating current respectively
Firewire and zero curve.
7. LED power according to claim 1-3, it is characterised in that:
The output circuit includes diode D7 and capacitor C6, and transformer forward direction exports terminating diode D7 anode, diode D7
Cathode LED power forward direction output end, the both ends capacitor C6 connect LED power forward direction output end and LED power negative sense output end respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820986857.9U CN208300086U (en) | 2018-06-25 | 2018-06-25 | A kind of low-power consumption LED power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820986857.9U CN208300086U (en) | 2018-06-25 | 2018-06-25 | A kind of low-power consumption LED power |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208300086U true CN208300086U (en) | 2018-12-28 |
Family
ID=64701891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820986857.9U Expired - Fee Related CN208300086U (en) | 2018-06-25 | 2018-06-25 | A kind of low-power consumption LED power |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208300086U (en) |
-
2018
- 2018-06-25 CN CN201820986857.9U patent/CN208300086U/en not_active Expired - Fee Related
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| 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: 20181228 |
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| CF01 | Termination of patent right due to non-payment of annual fee |