CN208479476U - A kind of LED power of overvoltage protection - Google Patents
A kind of LED power of overvoltage protection Download PDFInfo
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- CN208479476U CN208479476U CN201821132315.1U CN201821132315U CN208479476U CN 208479476 U CN208479476 U CN 208479476U CN 201821132315 U CN201821132315 U CN 201821132315U CN 208479476 U CN208479476 U CN 208479476U
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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
A kind of LED power of overvoltage protection, including rectification circuit, filter circuit, control circuit, transformer and the output circuit being sequentially connected, the input of rectification circuit terminates alternating current；Control circuit includes chip PL3590, transformer has main winding and auxiliary winding, 3 feet of filter circuit output end, resistance R1 and chip are sequentially connected, the positive input of auxiliary winding, resistance R5, diode D2 and chip 3 feet be sequentially connected, 3 feet of chip are connected to charging capacitor C4；4 feet, resistance R8 and the metal-oxide-semiconductor grid of chip are sequentially connected, and metal-oxide-semiconductor source electrode connects main winding negative sense output end, and metal-oxide-semiconductor drain electrode, resistance R10 and ground terminal are sequentially connected；5 feet, resistance R9 and the metal-oxide-semiconductor drain electrode of chip are sequentially connected, and positive input, resistance R6, resistance R11 and the ground terminal of auxiliary winding are sequentially connected, one end that 2 foot connecting resistance R6 of chip are connected with resistance R11.The utility model can detect output voltage, implement overvoltage protection, the safety of lifting system to output voltage.
Description
Technical field
The utility model relates to power technique fields, especially a kind of LED power of overvoltage protection.
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.
Existing LED power is generally comprised control circuit and switch metal-oxide-semiconductor, is controlled using the pwm signal of control circuit
The on-off of system switch metal-oxide-semiconductor, to realize, accurately voltage is controlled, to provide stable voltage source for LED.If there is event in circuit
Barrier, output voltage values are excessively high, it will reduce the service life of load end LED, or even the LED of damage load end.Therefore, existing skill
It is necessary to provide a kind of LED powers of implementable overvoltage protection for art.
Utility model content
The utility model provides a kind of LED power of overvoltage protection, can detect output voltage, implements over-voltage to output voltage
Protection, the safety of lifting system.
The utility model provides a kind of LED power of overvoltage protection, including be sequentially connected rectification circuit, filter circuit,
Control circuit, transformer and output circuit, the input terminal of the rectification circuit is for connecing alternating current；The control circuit includes chip
The input terminal of PL3590, the transformer have main winding and auxiliary winding, the filter circuit output end, resistance R1 and core
3 feet of piece PL3590 are sequentially connected, and the positive input of auxiliary winding, resistance R5,3 feet of diode D2 and chip PL3590 are suitable
Secondary to be connected, 3 feet of chip PL3590 are connected to charging capacitor C4；Filter circuit output end, resistance R2, resistance R7 and ground terminal are sequentially
It is connected, one end that the 1 foot connecting resistance R7 of chip PL3590 is connected with resistance R2；Filter circuit output end, resistance R3 and chip
5 feet of PL3590 are sequentially connected；4 feet, resistance R8 and the metal-oxide-semiconductor grid of chip PL3590 is sequentially connected, and metal-oxide-semiconductor source electrode connects main
Winding negative sense output end, metal-oxide-semiconductor drain electrode, resistance R10 and ground terminal are sequentially connected；5 feet, the resistance R9 and MOS of chip PL3590
Pipe drain electrode is sequentially connected, and positive input, resistance R6, resistance R11 and the ground terminal of auxiliary winding are sequentially connected, chip PL3590
The one end that is connected with resistance R11 2 foot connecting resistance R6.
Preferably, metal-oxide-semiconductor protection circuit, institute are further connected between the positive input and negative input of the main winding
Stating metal-oxide-semiconductor protection circuit includes capacitor C2, resistance R4 and diode D1, and diode D1 anode connects the negative sense input of main winding
End, the positive input of diode D1 cathode, capacitor C2 and main winding is sequentially connected, the both ends of resistance R4 connect respectively main around
The positive input and diode D1 anode of group.
Preferably, the both ends of the resistance R11 also and are connected to capacitor C6.
Preferably, the rectification circuit is bridge rectifier.
Preferably, the filter circuit includes filter capacitor C1, and the both ends of the filter capacitor C1 connect rectification circuit respectively
Output and ground.
Preferably, the output circuit includes diode D3, capacitor C7 and capacitor C8, and the diode D3 anode connects transformation
Device forward direction output end, diode D3 cathode connect output circuit forward direction output end, and the both ends of capacitor C7 and capacitor C8 connect defeated respectively
Circuit forward direction output end and negative sense output end out.
In the utility model, transformer auxiliary winding is directly proportional to main winding voltage, therefore the electricity inputted from 2 foot of chip
Pressure value is directly proportional to LED power output voltage values, is realized by monitoring auxiliary winding voltage and is monitored to output voltage.When chip 2
The voltage of foot reaches threshold voltage, and Vcc is begun to decline, and system will restart, to guarantee that system stablizes safe operation.
Detailed description of the invention
Fig. 1 is a kind of structural block diagram of the low-power consumption LED power of embodiment of the utility model；
Fig. 2 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 LED power of overvoltage protection, including be sequentially connected rectification circuit 1, filter
Wave circuit 2, control circuit 3, transformer 4 and output circuit 5, the input terminal of the rectification circuit 1 is for connecing alternating current, by alternating current
Be converted to direct current.Filter circuit 2 then filters out impurity wave, makes the pure stable direct current signal of circuit output.Transformer 4 is become
Pressure output, voltage value needed for making voltage output load.Output circuit 5 has the final output port of LED power, including just
To output port and negative sense output port, for load connection.Transformer 4 has main winding, auxiliary winding and output winding,
Main winding and auxiliary winding are as input, and output winding is then as output.
The control circuit 3 includes chip PL3590, the input terminal of the transformer 4 have main winding and auxiliary around
3 feet of group, the output end of the filter circuit 2, resistance R1 and chip PL3590 are sequentially connected, the positive input of auxiliary winding
3 feet at end, resistance R5, diode D2 and chip PL3590 are sequentially connected, and 3 feet of chip PL3590 are connected to charging capacitor C4；Filter
Wave circuit output end, resistance R2, resistance R7 and ground terminal are sequentially connected, 1 foot connecting resistance R7 and the resistance R2 phase of chip PL3590
One end even；5 feet of filter circuit output end, resistance R3 and chip PL3590 are sequentially connected；4 feet, the resistance of chip PL3590
R8 and metal-oxide-semiconductor grid are sequentially connected, and metal-oxide-semiconductor source electrode connects main winding negative sense output end, metal-oxide-semiconductor drain electrode, resistance R10 and ground terminal
It is sequentially connected；5 feet, resistance R9 and the metal-oxide-semiconductor drain electrode of chip PL3590 is sequentially connected, positive input, the resistance of auxiliary winding
R6, resistance R11 and ground terminal are sequentially connected, one end that the 2 foot connecting resistance R6 of chip PL3590 are connected with resistance R11.
Since main winding and auxiliary winding are wound on transformer the same side, the voltage value of coiling and main winding are assisted
Voltage value direct proportionality, those skilled in the art pass through ratio by measuring available corresponding proportionality coefficient
Coefficient calculates the voltage of main winding output.The voltage-drop loading of auxiliary winding is on concatenated resistance R6 and resistance R11, resistance
R11 partial pressure, therefore the voltage value inputted from 2 foot of chip is a part of auxiliary winding voltage value.Pass through what is inputted to 2 foot of chip
Voltage value is monitored, and can monitor the voltage value of entire circuit output.Portion in the chip, 2 foot of chip are connected to comparator, chip
The voltage of 2 feet input is compared with threshold voltage, when the voltage of 2 foot of chip input reaches or be greater than threshold voltage.Chip
The voltage value for controlling the input of 3 ends foot Vcc is begun to decline, reach it is scheduled chip will restart when restarting voltage value, to guarantee
System stablizes safe operation.
In one embodiment, metal-oxide-semiconductor guarantor is further connected between the positive input and negative input of the main winding
Protection circuit, the metal-oxide-semiconductor protection circuit includes capacitor C2, resistance R4 and diode D1, and diode D1 anode connects main winding
The positive input of negative input, diode D1 cathode, capacitor C2 and main winding is sequentially connected, the both ends difference of resistance R4
Connect the positive input and diode D1 anode of main winding.When the main winding of transformer 4 generates reverse peak voltage, by
In diode D1 reverse-conducting, crest voltage will be flowed through from D1 and will be loaded on capacitor C2, will not be flowed to metal-oxide-semiconductor, be played protection
The effect of metal-oxide-semiconductor.
In one embodiment, the both ends of the resistance R11 also and are connected to capacitor C6, and capacitor C6 can filter out resistance R11
The voltage of both ends alternating component keeps resistance R11 both end voltage pure and stablizes, and achievees the effect that promote detection accuracy.
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 2 includes filter capacitor C1, and the both ends of filter capacitor C1 connect primary coils respectively
Positive input and ground terminal, filter capacitor C1 can keep direct current output with the AC portion in filtering circuit.
In one embodiment, the output circuit 5 includes diode D3, capacitor C7 and capacitor C8, the diode D3
Cathode connecting transformer forward direction output end, diode D3 cathode connect output circuit forward direction output end, the both ends of capacitor C7 and capacitor C8
Output circuit forward direction output end and negative sense output end are connect respectively.The signal exported to transformer 4 is filtered by output circuit,
So that the voltage signal between LED power forward direction output end and negative sense output end is more stable.As shown in the figure, LED power is being just
There is the LED of multiple concatenations, to access between output end and negative sense output end to drive these LED operations.
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 (6)
1. a kind of LED power of overvoltage protection, 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；The control circuit includes chip PL3590, the input terminal of the transformer have main winding and
3 feet of auxiliary winding, the filter circuit output end, resistance R1 and chip PL3590 are sequentially connected, and the forward direction of auxiliary winding is defeated
3 feet for entering end, resistance R5, diode D2 and chip PL3590 are sequentially connected, and 3 feet of chip PL3590 are connected to charging capacitor C4；
Filter circuit output end, resistance R2, resistance R7 and ground terminal are sequentially connected, the 1 foot connecting resistance R7 and resistance R2 of chip PL3590
Connected one end；5 feet of filter circuit output end, resistance R3 and chip PL3590 are sequentially connected；4 feet, the electricity of chip PL3590
Resistance R8 and metal-oxide-semiconductor grid are sequentially connected, and metal-oxide-semiconductor source electrode connects main winding negative sense output end, metal-oxide-semiconductor drain electrode, resistance R10 and ground connection
End is sequentially connected；5 feet, resistance R9 and the metal-oxide-semiconductor drain electrode of chip PL3590 is sequentially connected, positive input, the electricity of auxiliary winding
Resistance R6, resistance R11 and ground terminal are sequentially connected, one end that the 2 foot connecting resistance R6 of chip PL3590 are connected with resistance R11.
2. LED power according to claim 1, it is characterised in that:
Metal-oxide-semiconductor protection circuit, the metal-oxide-semiconductor protection are further connected between the positive input and negative input of the main winding
Circuit includes capacitor C2, resistance R4 and diode D1, and diode D1 anode connects the negative input of main winding, and diode D1 is negative
The positive input of pole, capacitor C2 and main winding is sequentially connected, and the both ends of resistance R4 connect the positive input of main winding respectively
End and diode D1 anode.
3. LED power according to claim 1, it is characterised in that:
The both ends of the resistance R11 also and are connected to capacitor C6.
4. LED power according to claim 1, it is characterised in that:
The rectification circuit is bridge rectifier.
5. LED power according to claim 1, it is characterised in that:
The filter circuit includes filter capacitor C1, and the both ends of the filter capacitor C1 connect the output end of rectification circuit respectively and connect
Ground terminal.
6. LED power according to claim 1, it is characterised in that:
The output circuit includes diode D3, capacitor C7 and capacitor C8, the diode D3 cathode connecting transformer forward direction output
End, diode D3 cathode connect output circuit forward direction output end, and the both ends of capacitor C7 and capacitor C8 connect output circuit forward direction respectively
Output end and negative sense output end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821132315.1U CN208479476U (en) | 2018-07-17 | 2018-07-17 | A kind of LED power of overvoltage protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821132315.1U CN208479476U (en) | 2018-07-17 | 2018-07-17 | A kind of LED power of overvoltage protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208479476U true CN208479476U (en) | 2019-02-05 |
Family
ID=65211164
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821132315.1U Active CN208479476U (en) | 2018-07-17 | 2018-07-17 | A kind of LED power of overvoltage protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208479476U (en) |
-
2018
- 2018-07-17 CN CN201821132315.1U patent/CN208479476U/en active Active
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