CN203840611U - LED circuit having overheating protection function - Google Patents
LED circuit having overheating protection function Download PDFInfo
- Publication number
- CN203840611U CN203840611U CN201420225568.9U CN201420225568U CN203840611U CN 203840611 U CN203840611 U CN 203840611U CN 201420225568 U CN201420225568 U CN 201420225568U CN 203840611 U CN203840611 U CN 203840611U
- Authority
- CN
- China
- Prior art keywords
- circuit
- resistance
- led
- power
- npn type
- 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.)
- Expired - Lifetime
Links
- 238000013021 overheating Methods 0.000 title abstract 4
- 238000004146 energy storage Methods 0.000 claims description 25
- 239000003990 capacitor Substances 0.000 claims description 18
- 230000009993 protective function Effects 0.000 claims description 11
- 230000005611 electricity Effects 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Classifications
-
- Y02B20/42—
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model relates to an LED circuit having an overheating protection function and belongs to the technical field of LED circuits. The LED circuit having the overheating protection function solves the problem of how to provide the LED circuit which is simple in structure, capable of providing a stable electric current to an LED, capable of working normally after an LED light source is disconnected, capable of protecting the LED through power source disconnection when the LED is excessive in temperature and provided with the overheating protection function. The adopted technical solution is that the LED circuit comprises a power source circuit, a driving circuit, a control circuit, an LED illuminating circuit and a stand-by power source circuit, wherein electricity is supplied to the driving circuit and the LED illuminating circuit by the power source circuit, the control circuit and the driving circuit are electrically connected with the LED illuminating circuit, and the stand-by power source circuit is electrically connected with the LED illuminating circuit; under normal conditions, the stand-by power source circuit is charged through the power source circuit, electricity is supplied to the LED illuminating circuit by the stand-by power source circuit when the power source circuit is disconnected, and the LED circuit is suitable for the LED field.
Description
Technical field
A kind of LED circuit with overheat protective function of the utility model, belongs to the technical field of LED circuit.
Background technology
LED because it has that brightness is high, operating voltage is low, power consumption is little, miniaturization, the life-span is long, shock-resistant and the advantage such as stable performance, in fields such as finance, traffic, physical culture, advertisements, be used widely, LED is operated under environment under low pressure and by electric current and drives, generally in LED circuit, the power supply of LED work obtains from power supply step-down, current existing LED circuit is comparatively complicated, its reduction voltage circuit generally adopts capacitance-resistance voltage reduction circuit, the operation principle of capacitance-resistance voltage reduction circuit is that the capacitive reactance that utilizes electric capacity to produce under certain AC signal frequency limits maximum operating currenbt, the output current of this class circuit is less, change along with input voltage, the brightness of LED also changes thereupon, and capacitance-resistance step down type power supply is a kind of non-insulating power supply, fail safe is lower, in addition, the high-frequency noise in LED operating circuit, the violent change of voltage all can affect its illumination effect, so need to take some means to provide stable operating current to LED illuminating circuit in LED circuit, and when the power supply of LED occurs extremely to open circuit, whole LED system is by cisco unity malfunction, self temperature of LED can raise along with the growth of fluorescent lifetime, and when arriving certain high temperature, LED explosion can occur and even burns out whole LED circuit, causes the economic loss that can not save.
Utility model content
The utility model overcomes the deficiency that prior art exists, and technical problem to be solved is: provide a kind of simple in structure, can provide stabling current for LED, after the light source of LED opens circuit, circuit still can normally be worked and can be by dump to be protected the LED circuit with overheat protective function of LED when LED excess Temperature.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of LED circuit with overheat protective function, comprise power circuit, drive circuit, control circuit and LED illuminating circuit, described power circuit comprises the transformer that input is connected with mains supply, the energy storage chip that the bridge rectifier that input is connected with transformer output and input are connected with bridge rectifier output, described energy storage chip is powered to LED illuminating circuit by the first output OUT1, by the second output OUT2 to drive circuitry, the earth terminal GND ground connection of energy storage chip, described drive circuit comprises control chip and mainly by diode D1, capacitor C 3, the reduction voltage circuit that inductance L 2 forms, behind one end of the power end shunt-wound capacitance C2 of described control chip, be connected with the output OUT2 of energy storage chip, the other end ground connection of described capacitor C 2, the first control end of described control chip and connect the positive pole of diode D1 after be connected with one end of capacitor C 3, the negative pole of described diode D1 also connects one end of inductance L 2, one end of resistance R 6, behind one end of resistance R 7, be connected with the first output OUT1 of energy storage chip, one end of capacitor C 1 is connected with the line between energy storage chip the first output OUT1 and diode D1 negative pole, the other end ground connection of described capacitor C 1, after the other end of the other end shunt-wound capacitance C3 of described inductance L 2, be connected with the power input of the first switching circuit, the power output end of described the first switching circuit is connected with the power input of LED illuminating circuit, the power output end of described LED illuminating circuit is connected with the second control end of described control chip after being electrically connected to control circuit, the earth terminal GND ground connection of described control chip, ground connection after the other end series resistor R8 of described resistance R 6, ground connection after the other end series resistor R9 of described resistance R 7, the non-inverting input of the first comparator is connected with the line between resistance R 6 and resistance R 8, the inverting input of the first comparator is connected with the line between resistance R 7 and resistance R 9, the output of the first comparator is connected with the first ON-OFF control circuit, and the first ON-OFF control circuit is connected with the first switching circuit,
Described LED circuit also comprises stand-by power supply circuit, stand-by power supply circuit comprises rechargeable battery U1, resistance R 3, resistance R 4, resistance R 5, NPN type triode Q2, NPN type triode Q3 and diode D2, one end of the anodal and connecting resistance R4 of described rechargeable battery U1, behind one end of resistance R 5, be connected with the power input of LED illuminating circuit, behind one end of the negative pole of rechargeable battery U1 connecting resistance R3, be connected with the base stage of NPN type triode Q2, after the collector electrode of NPN type triode Q2 the other end of connecting resistance R4, be connected with the base stage of NPN type triode Q3, the collector electrode of NPN type triode Q3 connects the negative pole of diode D2, the other end of the anodal contact resistance R5 of diode D2, the emitter of NPN type triode Q3 also connects the emitter of NPN type triode Q2, after the other end of resistance R 3, be connected with the second control end of control chip, behind one end of one end of resistance R 12 connecting resistance R13, be connected with the positive pole of rechargeable battery U1, ground connection after the other end series resistor R10 of resistance R 12, resistance R 13 is ground connection after other end series resistor R11, the non-inverting input of the second comparator is connected with the line between resistance R 10 and resistance R 12, the inverting input of the second comparator is connected with the line between resistance R 11 and resistance R 13, the output of the second comparator is connected with second switch control circuit, second switch control circuit is connected with second switch circuit, second switch circuit is arranged on the power circuit between described LED illuminating circuit power input and rechargeable battery U1 positive pole.
Described resistance R 6 is for the temperature for sensing LED illuminating circuit LED and have the thermistor of negative temperature coefficient, resistance R 10 is for the temperature for sensing LED illuminating circuit LED and have the thermistor of positive temperature coefficient, and resistance R 7, resistance R 8, resistance R 9, resistance R 11, resistance R 12 and resistance R 13 do not have temperature coefficient; Described control circuit comprises NPN type triode Q1 and resistance R 1, the collector electrode of described NPN type triode Q1 connects the power output end of LED illuminating circuit, one end of the base stage contact resistance R1 of NPN type triode Q1, the other end of resistance R 1 and connect the emitter of NPN type triode Q1 after be connected with the second control end of described control chip; Described control chip is CAT4201 chip; The power end of described control chip is VBT end, and the first control end of described control chip is SW end, and the second control end of described control chip is CTRL end, and described control chip also has reset terminal RSET, ground connection after described reset terminal RSET tandem electric inductance L1; Between described transformer and bridge rectifier, be serially connected with a resistance R 2; Described LED illuminating circuit comprises at least one LED branch road.
The utility model compared with prior art has following beneficial effect:
1, in the utility model, by transformer and bridge rectifier, mains supply can be converted to the required power supply of LED, by conversion after electrical power storage in energy storage chip, by energy storage chip, export to respectively LED illuminating circuit and drive circuit, drive circuit is controlled LED illuminating circuit by control circuit.
2, on the power circuit between energy storage chip and LED illuminating circuit, be provided with capacitor C 1, this capacitor C 1 not only can filtering energy storage chip output high-frequency noise, cut off the path that high-frequency noise is propagated by current supply circuit, and prevent that noise that power supply carries forms circuit and disturb, improve energy storage chip and export to the Current rise of LED illuminating circuit and the waveform of decline, waveform is become gently, reached the object that plateau current is provided to LED illuminating circuit; In like manner, on the power circuit between energy storage chip and control chip, be provided with capacitor C 2, make control chip have stable power supply input, reduced the impact that power supply increases sharply on chip.
3, in the utility model, reduction voltage circuit is connected with the SW port of CAT4201 chip, control circuit is connected with the CTRL port of CAT4201 chip, during work, reduction voltage circuit coordinates the output voltage of storage chip is carried out to reduced output voltage with CAT4201 chip, control the electric current of LED illuminating circuit, the negative terminal of LED illuminating circuit is connected with the CTRL port of CAT4201 chip after connecting control circuit, electric current to LED illuminating circuit detects, and feed back switching signal amount, reach the output of controlling electric current.
When 4, power circuit is normally worked, not only give LED illuminating circuit and drive circuitry, return stand-by power supply circuit and charge, when the electric current of power circuit and rechargeable battery U1 is identical, NPN type triode Q2 cut-off, NPN type triode Q3 conducting, diode D2 lights, and illustrates that rechargeable battery U1 has been full of electricity, when power circuit disconnects because of abnormal conditions, stand-by power supply circuit is powered to LED illuminating circuit, thereby circuit is normally worked.
5, in the utility model, added by resistance R 6, resistance R 7, the bridge circuit that resistance R 8 and resistance R 9 form, wherein resistance R 6 is the thermistor for the temperature signal of sensing LED illuminating circuit LED, when in LED illuminating circuit, the temperature of LED is elevated to certain value, the output of the first comparison circuit being connected with above-mentioned bridge circuit is given signal of the first ON-OFF control circuit, the first ON-OFF control circuit is controlled the first switching circuit and is disconnected, block the power supply of LED illuminating circuit is supplied with, then make LED illuminating circuit disconnect, thereby protected each LED lamp in LED illuminating circuit.
6, owing to being also provided with stand-by power supply circuit in the utility model, excess Temperature as LED, after the first switching circuit cuts off main power source, stand-by power supply circuit starts the power supply to LED illuminating circuit makes it normally luminous, do not reach the object of protection LED, so added and comprised second switch circuit on the power circuit of stand-by power supply circuit and LED illuminating circuit, second switch control circuit, the second comparator and by resistance R 10, resistance R 11, the stand-by power supply of the bridge circuit that resistance R 12 and resistance R 13 form cuts off circuit, wherein resistance R 10 is the thermistor for the temperature signal of sensing LED illuminating circuit LED, when the temperature of LED in LED illuminating circuit is elevated to certain value, the output of the second comparison circuit being connected with above-mentioned bridge circuit is to signal of second switch control circuit, second switch control circuit is controlled second switch circuit and is disconnected, block the supply to LED illuminating circuit stand-by power supply, then make LED illuminating circuit thoroughly disconnect, thereby protected each LED lamp in LED illuminating circuit.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the utility model is described in more detail.
Fig. 1 is structural representation of the present utility model;
In figure: 1 is power circuit, 2 is drive circuit, and 3 is control circuit, 4 is LED illuminating circuit, 5 is energy storage chip, and 6 is control chip, and 7 is reduction voltage circuit, 8 is the first comparator, 9 is the first ON-OFF control circuit, and 10 is the first switching circuit, and 11 is second switch circuit, 12 is second switch control circuit, and 13 is the second comparator.
Embodiment
As shown in Figure 1, a kind of LED circuit, comprises power circuit 1, drive circuit 2, control circuit 3 and LED illuminating circuit 4, and described LED illuminating circuit 4 comprises at least one LED branch road, described power circuit 1 comprises the energy storage chip 5 that transformer that input is connected with mains supply, bridge rectifier that input is connected with transformer output and input are connected with bridge rectifier output, is serially connected with a resistance R 2 and carries out dividing potential drop between described transformer and bridge rectifier, described energy storage chip 5 is powered, by the second output OUT2, to drive circuit 2, is powered to LED illuminating circuit 4 by the first output OUT1, the earth terminal GND ground connection of energy storage chip 5, described drive circuit 2 comprises control chip 6 and mainly by diode D1, capacitor C 3, the reduction voltage circuit 7 that inductance L 2 forms, behind one end of the power end shunt-wound capacitance C2 of described control chip 6, be connected with the output OUT2 of energy storage chip 5, the other end ground connection of described capacitor C 2, the first control end of described control chip 6 and connect the positive pole of diode D1 after be connected with one end of capacitor C 3, the negative pole of described diode D1 also connects one end of inductance L 2, one end of resistance R 6, behind one end of resistance R 7, be connected with the first output OUT1 of energy storage chip 5, one end of capacitor C 1 is connected with the line between energy storage chip 5 first output OUT1 and diode D1 negative pole, the other end ground connection of described capacitor C 1, after the other end of the other end shunt-wound capacitance C3 of described inductance L 2, be connected with the power input of the first switching circuit 10, the power output end of described the first switching circuit 10 is connected with the power input of LED illuminating circuit 4, the power output end of described LED illuminating circuit 4 is connected with the second control end of described control chip 6 after being electrically connected to control circuit 3, the earth terminal GND ground connection of described control chip 6, ground connection after the other end series resistor R8 of described resistance R 6, ground connection after the other end series resistor R9 of described resistance R 7, the non-inverting input of the first comparator 8 is connected with the line between resistance R 6 and resistance R 8, the inverting input of the first comparator 8 is connected with the line between resistance R 7 and resistance R 9, the output of the first comparator 8 is connected with the first ON-OFF control circuit 9, and the first ON-OFF control circuit 9 is connected with the first switching circuit 10.
Described LED circuit also comprises stand-by power supply circuit, stand-by power supply circuit comprises rechargeable battery U1, resistance R 3, resistance R 4, resistance R 5, NPN type triode Q2, NPN type triode Q3 and diode D2, one end of the anodal and connecting resistance R4 of described rechargeable battery U1, behind one end of resistance R 5, be connected with the power input of LED illuminating circuit 4, behind one end of the negative pole of rechargeable battery U1 connecting resistance R3, be connected with the base stage of NPN type triode Q2, after the collector electrode of NPN type triode Q2 the other end of connecting resistance R4, be connected with the base stage of NPN type triode Q3, the collector electrode of NPN type triode Q3 connects the negative pole of diode D2, the other end of the anodal contact resistance R5 of diode D2, the emitter of NPN type triode Q3 also connects the emitter of NPN type triode Q2, after the other end of resistance R 3, be connected with the second control end of control chip 6, behind one end of one end of resistance R 12 connecting resistance R13, be connected with the positive pole of rechargeable battery U1, ground connection after the other end series resistor R10 of resistance R 12, resistance R 13 is ground connection after other end series resistor R11, the non-inverting input of the second comparator 13 is connected with the line between resistance R 10 and resistance R 12, the inverting input of the second comparator 13 is connected with the line between resistance R 11 and resistance R 13, the output of the second comparator 13 is connected with second switch control circuit 12, second switch control circuit 12 is connected with second switch circuit 11, second switch circuit 11 is arranged on the power circuit between described LED illuminating circuit 4 power inputs and rechargeable battery U1 positive pole.
In the present embodiment, described resistance R 6 is for the temperature for sensing LED illuminating circuit 4 LED and have the thermistor of negative temperature coefficient, resistance R 10 is for the temperature for sensing LED illuminating circuit 4 LED and have the thermistor of positive temperature coefficient, and described the first ON-OFF control circuit 9 is all carried out work based on high level signal with second switch control circuit 12, resistance R 7, resistance R 8, resistance R 9, resistance R 11, resistance R 12 and resistance R 13 do not have temperature coefficient, the lead-out terminal output low level signal of the first comparator 8 when the resistance value of resistance R 6, R7, R8 and R9 makes normal temperature, the lead-out terminal output low level signal of the second comparator 13 when the resistance value of resistance R 10, R11, R12 and R13 makes normal temperature, the product that product of resistance R 6 resistances and resistance R 9 resistances is greater than product, resistance R 11 resistances and resistance R 12 resistances of resistance R 7 resistances and resistance R 8 resistances is greater than the product of resistance R 10 resistances and resistance R 13 resistances, when resistance R 6 senses the temperature rising of LED in LED illuminating circuit 4, the resistance of resistance R 6 diminishes, the voltage of the non-inverting input of the first comparator 8 uprises, when the temperature of LED surpasses hot detected temperatures, the resistance of resistance R 8 will be greater than the resistance of resistance R 6, now, the voltage of the non-inverting input of the first comparator 8 becomes high level signal, and no matter how the temperature of LED changes, resistance R 7, the resistance of R8 and R9 is also constant, therefore the voltage of the inverting input of the first comparator 8 is also constant, so the first comparator 8 output high level signals, the first ON-OFF control circuit 9 based on high level signal work is controlled the first switching circuit 10 and is cut off the electricity supply, LED illuminating circuit is disconnected, each LED parts have been protected, in like manner, when resistance R 10 senses the temperature rising of LED in LED illuminating circuit 4, the resistance of resistance R 10 increases, the voltage of the non-inverting input of the second comparator 13 uprises, when the temperature of LED surpasses hot detected temperatures, the resistance of resistance R 10 will be greater than the resistance of resistance R 12, now, the voltage of the non-inverting input of the second comparator 13 becomes high level signal, and no matter how the temperature of LED changes, resistance R 11, the resistance of R12 and R13 is also constant, therefore the voltage of the inverting input of the second comparator 13 is also constant, so the second comparator 13 output high level signals, second switch control circuit 12 based on high level signal work is controlled second switch circuit 11 and is cut off the electricity supply, LED illuminating circuit is disconnected, each LED parts have been protected.
Described control circuit 3 comprises NPN type triode Q1 and resistance R 1, the collector electrode of described NPN type triode Q1 connects the power output end of LED illuminating circuit 4, one end of the base stage contact resistance R1 of NPN type triode Q1, the other end of resistance R 1 and connect the emitter of NPN type triode Q1 after be connected with the second control end of described control chip 6.
In the present embodiment, described control chip 6 can be CAT4201 chip, the power end of described control chip 6 is VBT end, the first control end of described control chip 6 is SW end, the second control end of described control chip 6 is CTRL end, described control chip 6 also has reset terminal RSET, ground connection after described reset terminal RSET tandem electric inductance L1.
The utility model circuit structure is simple, the impact of the violent change that has effectively reduced high-frequency noise, voltage on LED operating circuit, the LED illuminating circuit that is cascaded as by each circuit module provides stable operating current, and when LED raises self temperature due to excessive heating, can cut off main power source and stand-by power supply, LED is protected, there is very large practicality; By reference to the accompanying drawings embodiments of the invention are explained in detail above, but the present invention is not limited to above-described embodiment, in the ken possessing those of ordinary skills, can also under the prerequisite that does not depart from aim of the present invention, makes various variations.
Claims (7)
1. a LED circuit with overheat protective function, comprise power circuit (1), drive circuit (2), control circuit (3) and LED illuminating circuit (4), it is characterized in that: described power circuit (1) comprises the transformer that input is connected with mains supply, the energy storage chip (5) that the bridge rectifier that input is connected with transformer output and input are connected with bridge rectifier output, described energy storage chip (5) is powered to LED illuminating circuit (4) by the first output OUT1, by the second output OUT2, to drive circuit (2), power, the earth terminal GND ground connection of energy storage chip (5), described drive circuit (2) comprises control chip (6) and mainly by diode D1, capacitor C 3, the reduction voltage circuit (7) that inductance L 2 forms, behind one end of the power end shunt-wound capacitance C2 of described control chip (6), be connected with the output OUT2 of energy storage chip (5), the other end ground connection of described capacitor C 2, the first control end of described control chip (6) and connect the positive pole of diode D1 after be connected with one end of capacitor C 3, the negative pole of described diode D1 also connects one end of inductance L 2, one end of resistance R 6, behind one end of resistance R 7, be connected with the first output OUT1 of energy storage chip (5), one end of capacitor C 1 is connected with the line between energy storage chip (5) first output OUT1 and diode D1 negative pole, the other end ground connection of described capacitor C 1, after the other end of the other end shunt-wound capacitance C3 of described inductance L 2, be connected with the power input of the first switching circuit (10), the power output end of described the first switching circuit (10) is connected with the power input of LED illuminating circuit (4), the power output end of described LED illuminating circuit (4) is connected with the second control end of described control chip (6) after being electrically connected to control circuit (3), the earth terminal GND ground connection of described control chip (6), ground connection after the other end series resistor R8 of described resistance R 6, ground connection after the other end series resistor R9 of described resistance R 7, the non-inverting input of the first comparator (8) is connected with the line between resistance R 6 and resistance R 8, the inverting input of the first comparator (8) is connected with the line between resistance R 7 and resistance R 9, the output of the first comparator (8) is connected with the first ON-OFF control circuit (9), and the first ON-OFF control circuit (9) is connected with the first switching circuit (10),
Described LED circuit also comprises stand-by power supply circuit, stand-by power supply circuit comprises rechargeable battery U1, resistance R 3, resistance R 4, resistance R 5, NPN type triode Q2, NPN type triode Q3 and diode D2, one end of the anodal and connecting resistance R4 of described rechargeable battery U1, behind one end of resistance R 5, be connected with the power input of LED illuminating circuit (4), behind one end of the negative pole of rechargeable battery U1 connecting resistance R3, be connected with the base stage of NPN type triode Q2, after the collector electrode of NPN type triode Q2 the other end of connecting resistance R4, be connected with the base stage of NPN type triode Q3, the collector electrode of NPN type triode Q3 connects the negative pole of diode D2, the other end of the anodal contact resistance R5 of diode D2, the emitter of NPN type triode Q3 also connects the emitter of NPN type triode Q2, after the other end of resistance R 3, be connected with the second control end of control chip (6), behind one end of one end of resistance R 12 connecting resistance R13, be connected with the positive pole of rechargeable battery U1, ground connection after the other end series resistor R10 of resistance R 12, resistance R 13 is ground connection after other end series resistor R11, the non-inverting input of the second comparator (13) is connected with the line between resistance R 10 and resistance R 12, the inverting input of the second comparator (13) is connected with the line between resistance R 11 and resistance R 13, the output of the second comparator (13) is connected with second switch control circuit (12), second switch control circuit (12) is connected with second switch circuit (11), second switch circuit (11) is arranged on the power circuit between described LED illuminating circuit (4) power input and rechargeable battery U1 positive pole.
2. a kind of LED circuit with overheat protective function according to claim 1; it is characterized in that: described resistance R 6 is for the temperature for sensing LED illuminating circuit (4) LED and have the thermistor of negative temperature coefficient; resistance R 10 is for the temperature for sensing LED illuminating circuit (4) LED and have the thermistor of positive temperature coefficient, and resistance R 7, resistance R 8, resistance R 9, resistance R 11, resistance R 12 and resistance R 13 do not have temperature coefficient.
3. a kind of LED circuit with overheat protective function according to claim 1; it is characterized in that: described control circuit (3) comprises NPN type triode Q1 and resistance R 1; the collector electrode of described NPN type triode Q1 connects the power output end of LED illuminating circuit (4); one end of the base stage contact resistance R1 of NPN type triode Q1, the other end of resistance R 1 and connect the emitter of NPN type triode Q1 after be connected with the second control end of described control chip (6).
4. a kind of LED circuit with overheat protective function according to claim 1, is characterized in that: described control chip (6) is CAT4201 chip.
5. a kind of LED circuit with overheat protective function according to claim 4; it is characterized in that: the power end of described control chip (6) is VBT end; the first control end of described control chip (6) is SW end; the second control end of described control chip (6) is CTRL end; described control chip (6) also has reset terminal RSET, ground connection after described reset terminal RSET tandem electric inductance L1.
6. a kind of LED circuit with overheat protective function according to claim 1, is characterized in that: between described transformer and bridge rectifier, be serially connected with a resistance R 2.
7. a kind of LED circuit with overheat protective function according to claim 1, is characterized in that: described LED illuminating circuit (4) comprises at least one LED branch road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420225568.9U CN203840611U (en) | 2014-05-05 | 2014-05-05 | LED circuit having overheating protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420225568.9U CN203840611U (en) | 2014-05-05 | 2014-05-05 | LED circuit having overheating protection function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203840611U true CN203840611U (en) | 2014-09-17 |
Family
ID=51518402
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420225568.9U Expired - Lifetime CN203840611U (en) | 2014-05-05 | 2014-05-05 | LED circuit having overheating protection function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203840611U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105611687A (en) * | 2015-11-24 | 2016-05-25 | 芜湖锐芯电子科技有限公司 | LED circuit |
-
2014
- 2014-05-05 CN CN201420225568.9U patent/CN203840611U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105611687A (en) * | 2015-11-24 | 2016-05-25 | 芜湖锐芯电子科技有限公司 | LED circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202721866U (en) | New type driving circuit which is compatible with LED lamp tube | |
| CN201374838Y (en) | LED driving power source | |
| CN103401209B (en) | LED backlight short-circuit protection circuit | |
| CN102769959A (en) | LED light-dimming driving circuit | |
| CN102740538A (en) | Led drive circuit | |
| CN203840609U (en) | LED circuit having overheating protection function | |
| CN205333724U (en) | Stand -by power supply voltage detecting early warning circuit | |
| CN106937450A (en) | A kind of under-voltage protecting circuit for LED lamp | |
| CN104735879A (en) | Led circuit | |
| CN203261005U (en) | LED constant-current over-temperature protection circuit and LED lamp | |
| CN102510605B (en) | Novel LED (light emitting diode) driving circuit and drive method | |
| CN204518147U (en) | A kind of LED drive circuit | |
| CN203840611U (en) | LED circuit having overheating protection function | |
| CN202092083U (en) | LED headlight control circuit | |
| CN103889089A (en) | Driving circuit and lamp | |
| CN203840612U (en) | Led circuit | |
| CN203071567U (en) | Linear high voltage LED drive protection circuit | |
| CN205005320U (en) | Driving circuit of light -emitting diode (LED) fluorescent tube | |
| CN204244504U (en) | A kind of drive circuit of ballast formula LED | |
| CN203840610U (en) | LED circuit having stand-by power source circuit | |
| CN203840614U (en) | Circuit used for LED | |
| CN203261560U (en) | Stroboflash-free circuit | |
| CN203104914U (en) | Improved LED (Lighting-Emitting Diode) driving circuit | |
| CN202373812U (en) | Energy-saving and consumption-reducing power socket | |
| CN202190435U (en) | Novel LED street lamp driving power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140917 |