CN207897194U - The driving circuit of LED light - Google Patents
The driving circuit of LED light Download PDFInfo
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- CN207897194U CN207897194U CN201820290652.7U CN201820290652U CN207897194U CN 207897194 U CN207897194 U CN 207897194U CN 201820290652 U CN201820290652 U CN 201820290652U CN 207897194 U CN207897194 U CN 207897194U
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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]
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Abstract
The utility model discloses a kind of driving circuits of LED light, including primary side feedback isolation circuit, current rectifying and wave filtering circuit, switching signal detection circuit, voltage stabilizing triode, microcontroller, LED constant current chip and 3 metal-oxide-semiconductors, primary side feedback isolation circuit is electrically connected with current rectifying and wave filtering circuit, current rectifying and wave filtering circuit is electrically connected with switching signal detection circuit and voltage stabilizing triode respectively, voltage stabilizing triode and switching signal detection circuit with monolithic mechatronics, microcontroller is electrically connected with 2 metal-oxide-semiconductors and LED constant current chip respectively, LED constant current chip is electrically connected with another 1 metal-oxide-semiconductor, 3 metal-oxide-semiconductors are connect with 3 LED light strings respectively.The utility model has the characteristics that safety is good.
Description
Technical field
The utility model is related to LED constant current chip drive circuit technical fields, having load short circuits more particularly, to one kind
The driving circuit of the LED light of defencive function.
Background technology
Conventional linear constant current LED drive circuit controls LED light by switching chopping way, and output does not have short-circuit protection work(
Can, after load short circuits, circuit is easy to burn.
Invention content
The goal of the invention of the utility model be in order to overcome the shortcomings of that LED lamp circuit in the prior art is easy to be burned out,
Provide a kind of driving circuit of the LED light with load short circuit protection function.
To achieve the goals above, the utility model uses following technical scheme：
A kind of driving circuit of LED light, including primary side feedback isolation circuit, current rectifying and wave filtering circuit, switching signal detection electricity
Road, voltage stabilizing triode, microcontroller, LED constant current chip and 3 MOS pipes；Further include short-circuit protection circuit, primary side feedback isolation electricity
Road is electrically connected with current rectifying and wave filtering circuit, and current rectifying and wave filtering circuit is electrically connected with switching signal detection circuit and voltage stabilizing triode respectively,
Voltage stabilizing triode and switching signal detection circuit are with monolithic mechatronics, and microcontroller is managed respectively with 2 MOS and LED constant current core
Piece is electrically connected, and short-circuit protection circuit and LED constant current chip are electrically connected with another 1 metal-oxide-semiconductor, short-circuit protection circuit and LED constant current
Chip is electrically connected, and 3 metal-oxide-semiconductors are connect with 3 LED light strings respectively.
The utility model is suitable in three sections of switch dimmings driving of a panel LED light, and MCU driving metal-oxide-semiconductor is real
The now switching of output colour temperature and brightness control function, when there is 10% brightness of third gear in output short-circuit test, the hair of metal-oxide-semiconductor
Heat is serious, and more than 120 DEG C, short-circuit dissipation also reaches 4W.
The utility model increases short-circuit protection circuit under the premise of constant current driving IC does not have short-circuit protection function,
Reach output short circuit protection function.
Preferably, current rectifying and wave filtering circuit includes transformer L41C, resistance R1, resistance RS52, resistance RS515, resistance
RS516 and resistance RS53, capacitance C1, electrolytic capacitor C51 and electrolytic capacitor C52, common mode magnet ring L53 and diode D51；Transformer
The one end L41C is electrically connected with diode D51 anodes and the one end capacitance C1 respectively, and the capacitance C1 other ends are electrically connected with the one end resistance R1,
The resistance R1 other ends are electrically connected with diode D51 cathode, electrolytic capacitor C51 anodes, the one end resistance RS52 and common mode magnet ring L53 respectively
It connects, electrolytic capacitor C51 cathode are electrically connected with the transformer L41C other ends, the resistance RS52 other ends and common mode magnet ring L53 respectively, electricity
It solves the both ends after capacitance C52 and resistance RS53 parallel connections to be electrically connected with common mode magnet ring L53, resistance RS515 and resistance RS516 are equal
It is electrically connected with common mode magnet ring L53.
Preferably, switching signal detection circuit include diode DS51, voltage-stabiliser tube ZS51, capacitance CS52, resistance RS54,
Resistance RS55, resistance RS56 and capacitance CS58；Diode DS51 anodes are electrically connected with transformer L41C, diode DS51 cathode
Be electrically connected respectively with capacitance CS52 and the one end resistance RS54, the resistance RS54 other ends respectively with the one end resistance RS55, resistance RS56
One end and the electrical connection of voltage-stabiliser tube ZS51 cathode, the resistance RS56 other ends are electric respectively with the one end capacitance CS58 and monolithic mechatronics
Hold the CS52 other ends, the resistance RS55 other ends, voltage-stabiliser tube ZS51 anodes and the capacitance CS58 other ends to be grounded.
Preferably, 3 metal-oxide-semiconductors are respectively metal-oxide-semiconductor QS51, metal-oxide-semiconductor QS52 and MOS pipe QS53, microcontroller passes through resistance
RS57 is electrically connected with metal-oxide-semiconductor QS51, and microcontroller is electrically connected by resistance RS58 with metal-oxide-semiconductor QS51, and microcontroller passes through resistance RS59
It is electrically connected with LED constant current chip, LED constant current chip is electrically connected with metal-oxide-semiconductor QS53.
Preferably, short-circuit protection circuit includes capacitance CS81, resistance RS81, resistance RS82, voltage-stabiliser tube ZS81 and three poles
Pipe QS81；The one end capacitance CS81 is electrically connected with the base stage of the one end triode QS81, the one end resistance RS82 and triode QS81 respectively,
The collector of triode QS81 is electrically connected with LED constant current chip, and the resistance RS81 other ends are electrically connected with voltage-stabiliser tube ZS81 anodes, surely
Pressure pipe ZS81 cathode are electrically connected with metal-oxide-semiconductor QS53, and the emitter of capacitance CS81, resistance RS82 and triode QS81 are grounded.
When LED constant current chip loads appearance short circuit, the voltage in DC+ is all added in metal-oxide-semiconductor and sampling resistor both ends, voltage
Height can cause metal-oxide-semiconductor QS53 crest voltages high, and calorific value becomes larger, and there are security risks, so to avoid metal-oxide-semiconductor QS53 from generating heat
Security risk is caused, output short circuit protection is increased, using the D extremely high potentials of power MOS pipe QS53 when load short circuits, is used
The DIM feet that the short-circuit LED constant current chip of triode is driven after one voltage-stabiliser tube and two electric resistance partial pressures, are pulled low to low potential, make
The G of power MOS pipe QS53 extremely low levels, and then metal-oxide-semiconductor QS53 does not work, and open-circuit condition is in, to reach short-circuit protection
Effect, avoids security risk.
Preferably, further including resistance RS514, resistance RS515 and resistance RS520, LED constant current chip and resistance RS520
One end is electrically connected, and the resistance RS520 other ends are electrically connected with resistance RS514 and the one end resistance RS515 respectively, resistance RS514 and electricity
The resistance RS515 other ends are grounded.
Preferably, the model 0C7131 of LED constant current chip.
Preferably, the model STM8S001 of microcontroller.
Therefore, the utility model has the advantages that：It is at low cost, improve the service life of LED light, safety
It is good.
Description of the drawings
Fig. 1 is a kind of functional block diagram of the utility model；
Fig. 2 is a kind of circuit diagram of the current rectifying and wave filtering circuit of the utility model；
Fig. 3 is a kind of circuit diagram of the switching signal detection circuit of the utility model；
Fig. 4 is a kind of circuit diagram of the voltage stabilizing triode of the utility model, microcontroller and LED constant current chip；
Fig. 5 is a kind of circuit diagram of the primary side feedback isolation circuit of the utility model；
Fig. 6 is a kind of circuit diagram of the short-circuit protection circuit of the utility model.
In figure：Primary side feedback isolation circuit 1, current rectifying and wave filtering circuit 2, switching signal detection circuit 3, voltage stabilizing triode 4, list
Piece machine 5, LED constant current chip 6, short-circuit protection circuit 7.
Specific implementation mode
The utility model is further described with reference to the accompanying drawings and detailed description.
Embodiment as shown in Figure 1 is a kind of driving circuit of LED light, including primary side feedback isolation circuit 1, rectifying and wave-filtering
Circuit 2, switching signal detection circuit 3, voltage stabilizing triode 4, microcontroller 5, LED constant current chip 6 and 3 metal-oxide-semiconductors, primary side feedback every
It is electrically connected with current rectifying and wave filtering circuit from circuit, current rectifying and wave filtering circuit is electrically connected with switching signal detection circuit and voltage stabilizing triode respectively
Connect, voltage stabilizing triode and switching signal detection circuit with monolithic mechatronics, microcontroller respectively with 2 metal-oxide-semiconductors and LED constant current
Chip is electrically connected, and LED constant current chip is electrically connected with another 1 MOS pipe, and 3 metal-oxide-semiconductors are connect with 3 LED light strings respectively.
As shown in Fig. 2, current rectifying and wave filtering circuit includes transformer L41C, resistance R1, resistance RS52, resistance RS515, resistance
RS516 and resistance RS53, capacitance C1, electrolytic capacitor C51 and electrolytic capacitor C52, common mode magnet ring L53 and diode D51；Transformer
The one end L41C is electrically connected with diode D51 anodes and the one end capacitance C1 respectively, and the capacitance C1 other ends are electrically connected with the one end resistance R1,
The resistance R1 other ends are electrically connected with diode D51 cathode, electrolytic capacitor C51 anodes, the one end resistance RS52 and common mode magnet ring L53 respectively
It connects, electrolytic capacitor C51 cathode are electrically connected with the transformer L41C other ends, the resistance RS52 other ends and common mode magnet ring L53 respectively, electricity
It solves the both ends after capacitance C52 and resistance RS53 parallel connections to be electrically connected with common mode magnet ring L53, resistance RS515 and resistance RS516 are equal
It is electrically connected with common mode magnet ring L53.
As shown in figure 3, switching signal detection circuit includes diode DS51, voltage-stabiliser tube ZS51, capacitance CS52, resistance
RS54, resistance RS55, resistance RS56 and capacitance CS58；Diode DS51 anodes are electrically connected with transformer L41C, diode DS51
Cathode is electrically connected with capacitance CS52 and the one end resistance RS54 respectively, the resistance RS54 other ends respectively with the one end resistance RS55, resistance
The one end RS56 and the electrical connection of voltage-stabiliser tube ZS51 cathode, the resistance RS56 other ends are electrically connected with the one end capacitance CS58 and microcontroller respectively
It connects, the capacitance CS52 other ends, the resistance RS55 other ends, voltage-stabiliser tube ZS51 anodes and the capacitance CS58 other ends are grounded.
As shown in figure 4,3 metal-oxide-semiconductors are respectively metal-oxide-semiconductor QS51, metal-oxide-semiconductor QS52 and MOS pipe QS53, microcontroller passes through electricity
Resistance RS57 is electrically connected with metal-oxide-semiconductor QS51, and microcontroller is electrically connected by resistance RS58 with metal-oxide-semiconductor QS51, and microcontroller passes through resistance
RS59 is electrically connected with LED constant current chip, and LED constant current chip is electrically connected with metal-oxide-semiconductor QS53.
Further include resistance RS514, resistance RS515 and resistance RS520, LED constant current chip is electrically connected with the one end resistance RS520
It connects, the resistance RS520 other ends are electrically connected with resistance RS514 and the one end resistance RS515 respectively, and resistance RS514 and resistance RS515 are another
One end is grounded.
The model OC7131 of LED constant current chip, the model STM8S001 of microcontroller；Primary side feedback isolation circuit is as schemed
Shown in 5.
Further include short-circuit protection circuit 7 as shown in FIG. 6, short-circuit protection circuit includes capacitance CS81, resistance RS81, electricity
Hinder RS82, voltage-stabiliser tube ZS81 and triode QS81；The one end capacitance CS81 respectively with the one end triode QS81, the one end resistance RS82
It is electrically connected with the base stage of triode QS81, the collector of triode QS81 is electrically connected with 5 pins of LED constant current chip, resistance
The RS81 other ends are electrically connected with voltage-stabiliser tube ZS81 anodes, and voltage-stabiliser tube ZS81 cathode are electrically connected with MOS pipes QS53, capacitance CS81, electricity
The emitter of resistance RS82 and triode QS81 is grounded.
The operation principle of the utility model is as follows：
When primary side feedback isolation circuit powers on, voltage is by DS51 and CS52 rectifying and wave-filterings, by RS54, RS55 points
Pressure, then by ZS51 voltage stabilizings, by obtaining a stable voltage signal after RS56 and CS58 to I/O mouthfuls of 6 foot of microcontroller, voltage
For high level；Conversely, when electric under primary side feedback isolation circuit, I/O mouthfuls of 6 foot of microcontroller is low level.
US52 is high voltage stabilizing triode, and output voltage 5.1v, when circuit works, the voltage by acquiring DC+ is
Microcontroller provides stable 5.1V voltages.
Current rectifying and wave filtering circuit provides stable voltage and current for DC+, and CON1 is burning program port, and US51 is monolithic
Machine, US5 is constant current IC, and due to first gear and second gear (DC1- and DC2-), in output short-circuit, the included short circuits of prime IC are protected
Protective function is protected；When third gear short circuit, the utility model provides following short-circuit protection scheme：
By control primary side feedback isolation circuit power on and lower electricity, by the switching of microcontroller to third gear load just
Often when work, 5 foot of microcontroller is high level, and 1 foot, 7 foot is low level, and QS51, QS52 are open circuit, and 5 foot high level of microcontroller is logical
It crosses RS59 and constant current IC US5DIM feet is set to high level, and US5DIM high level is effective, 4 foot DRV output high level drivings
Metal-oxide-semiconductor QS53 accesses, DC+ voltages pass through RS520 by metal-oxide-semiconductor QS53 to RS514 and RS513 to SGND, 2 foot CS detection feet
After acquiring RS514 and RS513 voltages, 4 foot PWM are adjusted by US5, reach constant current effect, at this time the D pole tensions of metal-oxide-semiconductor QS53
Only 8V or so, the not up to conducting voltage of ZS81 (ZS81 is 15V zener diodes), resistance is not divided enough, three poles
Pipe can not be connected, and fail to pull down US5Dim foot voltages, high level, 4 feet is kept normally to export.
When short circuit occurs for output loading, the D pole tensions of metal-oxide-semiconductor QS53 become DC+ voltages 30V or so, beyond ZS81
Conducting voltage, ZS are connected, and driving triode QS81 conductings, pull down US5Dim foot voltages after electric resistance partial pressure, keep low level, 4 feet
Low level is exported, MOS pipes QS53 open circuits reach defencive function.
It should be understood that the present embodiment is merely to illustrate the utility model rather than limitation the scope of the utility model.In addition
It should be understood that after reading the content taught by the present invention, those skilled in the art can make the utility model various
Change or modification, these equivalent forms also fall within the scope of the appended claims of the present application.
Claims (8)
1. a kind of driving circuit of LED light, characterized in that including primary side feedback isolation circuit (1), current rectifying and wave filtering circuit (2), open
OFF signal detection circuit (3), voltage stabilizing triode (4), microcontroller (5), LED constant current chip (6) and 3 metal-oxide-semiconductors；It further include short circuit
Circuit (7), primary side feedback isolation circuit is protected to be electrically connected with current rectifying and wave filtering circuit, current rectifying and wave filtering circuit is examined with switching signal respectively
Slowdown monitoring circuit and the electrical connection of voltage stabilizing triode, voltage stabilizing triode and switching signal detection circuit with monolithic mechatronics, microcontroller
It is electrically connected respectively with 2 metal-oxide-semiconductors and LED constant current chip, short-circuit protection circuit and LED constant current chip are electrically connected with another 1 metal-oxide-semiconductor
It connects, short-circuit protection circuit and the electrical connection of LED constant current chip, 3 metal-oxide-semiconductors are connect with 3 LED light strings respectively.
2. the driving circuit of LED light according to claim 1, characterized in that current rectifying and wave filtering circuit include transformer L41C,
Resistance R1, resistance RS52, resistance RS515, resistance RS516 and resistance RS53, capacitance C1, electrolytic capacitor C51 and electrolytic capacitor
C52, common mode magnet ring L53 and diode D51；The one end transformer L41C is electrically connected with diode D51 anodes and the one end capacitance C1 respectively
Connect, the capacitance C1 other ends are electrically connected with the one end resistance R1, the resistance R1 other ends respectively with diode D51 cathode, electrolytic capacitor C51
Anode, the one end resistance RS52 and common mode magnet ring L53 electrical connection, electrolytic capacitor C51 cathode respectively with the transformer L41C other ends, electricity
Hinder the RS52 other ends and common mode magnet ring L53 electrical connection, the both ends after electrolytic capacitor C52 and resistance RS53 parallel connections with common mode magnet ring
L53 is electrically connected, and resistance RS515 and resistance RS516 are electrically connected with common mode magnet ring L53.
3. the driving circuit of LED light according to claim 2, characterized in that switching signal detection circuit includes diode
DS51, voltage-stabiliser tube ZS51, capacitance CS52, resistance RS54, resistance RS55, resistance RS56 and capacitance CS58；Diode DS51 anodes
It is electrically connected with transformer L41C, diode DS51 cathode are electrically connected with capacitance CS52 and the one end resistance RS54 respectively, resistance RS54
The other end is electrically connected with the one end resistance RS55, the one end resistance RS56 and voltage-stabiliser tube ZS51 cathode respectively, the resistance RS56 other ends point
Not with the one end capacitance CS58 and monolithic mechatronics, the capacitance CS52 other ends, the resistance RS55 other ends, voltage-stabiliser tube ZS51 anode and
The capacitance CS58 other ends are grounded.
4. the driving circuit of LED light according to claim 1, characterized in that 3 metal-oxide-semiconductors are respectively metal-oxide-semiconductor QS51, MOS
Pipe QS52 and metal-oxide-semiconductor QS53, microcontroller are electrically connected by resistance RS57 with metal-oxide-semiconductor QS51, and microcontroller passes through resistance RS58 and MOS
Pipe QS51 electrical connections, microcontroller are electrically connected by resistance RS59 with LED constant current chip, and LED constant current chip is electrically connected with metal-oxide-semiconductor QS53
It connects.
5. the driving circuit of LED light according to claim 4, characterized in that short-circuit protection circuit includes capacitance CS81, electricity
Hinder RS81, resistance RS82, voltage-stabiliser tube ZS81 and triode QS81；The one end capacitance CS81 respectively with the one end triode QS81, resistance
The base stage of the one end RS82 and triode QS81 are electrically connected, and the collector of triode QS81 is electrically connected with LED constant current chip, resistance
The RS81 other ends are electrically connected with voltage-stabiliser tube ZS81 anodes, and voltage-stabiliser tube ZS81 cathode are electrically connected with metal-oxide-semiconductor QS53, capacitance CS81, electricity
The emitter of resistance RS82 and triode QS81 is grounded.
6. the driving circuit of LED light according to claim 1, characterized in that further include resistance RS514, resistance RS515 and
Resistance RS520, LED constant current chip are electrically connected with the one end resistance RS520, the resistance RS520 other ends respectively with resistance RS514 and electricity
The electrical connection of the one end RS515 is hindered, resistance RS514 and the resistance RS515 other ends are grounded.
7. the driving circuit of LED light according to claim 1, characterized in that the model OC7131 of LED constant current chip.
8. the driving circuit of the LED light according to claims 1 or 2 or 3 or 4 or 5 or 6 or 7, characterized in that microcontroller
Model STM8S001.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820290652.7U CN207897194U (en) | 2018-03-01 | 2018-03-01 | The driving circuit of LED light |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820290652.7U CN207897194U (en) | 2018-03-01 | 2018-03-01 | The driving circuit of LED light |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207897194U true CN207897194U (en) | 2018-09-21 |
Family
ID=63541857
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820290652.7U Expired - Fee Related CN207897194U (en) | 2018-03-01 | 2018-03-01 | The driving circuit of LED light |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207897194U (en) |
-
2018
- 2018-03-01 CN CN201820290652.7U patent/CN207897194U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180921 Termination date: 20210301 |