CN203840612U - Led circuit - Google Patents
Led circuit Download PDFInfo
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- CN203840612U CN203840612U CN201420225572.5U CN201420225572U CN203840612U CN 203840612 U CN203840612 U CN 203840612U CN 201420225572 U CN201420225572 U CN 201420225572U CN 203840612 U CN203840612 U CN 203840612U
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- 238000013021 overheating Methods 0.000 claims abstract description 11
- 239000003990 capacitor Substances 0.000 claims description 29
- 238000004146 energy storage Methods 0.000 claims description 28
- 230000009467 reduction Effects 0.000 claims description 12
- 230000005611 electricity Effects 0.000 abstract 1
- 230000000630 rising effect Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 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
- 238000005286 illumination Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000009993 protective function Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model relates to an LED circuit and belongs to the technical field of LED circuits. The utility model solves the technical problem of how to provide an 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 and provided with a stand-by power source circuit. 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 an overheating protection 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 LED circuit is suitable for the LED field.
Description
Technical field
The utility model LED circuit, 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, the advantage such as long, the shock-resistant and stable performance of miniaturization, life-span, be used widely in fields such as finance, traffic, physical culture, advertisements, 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, along with the change of 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, self temperature of LED can raise along with the growth of fluorescent lifetime, and in the time 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 stabling current be provided and there is the LED circuit of overheat protective function for LED.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is: LED circuit, comprise power circuit, drive circuit, control circuit and LED illuminating circuit, described LED circuit also comprises overheating protection 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 and overheating protection 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 and connect one end of inductance L 2 after 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 LED illuminating circuit, the power output end of described LED illuminating circuit is connected with the second control end of described control chip with after control circuit electrical connection, the earth terminal GND ground connection of described control chip, described overheating protection circuit comprises comparator, ON-OFF control circuit and switching circuit, one end of the non-inverting input of described comparator connecting resistance R5, one end of resistance R 6, behind one end of resistance R 8, be connected with one end of capacitor C 4, one end of the inverting input shunt-wound capacitance C5 of comparator, behind one end of thermistor R4, be connected with one end of divider resistance R3, the other end of the other end of divider resistance R3 connecting resistance R5, the power end of comparator, behind one end of resistance R 7, be connected with the first output OUT1 of energy storage chip, the other end of thermistor R4, the other end of capacitor C 4, the other end of resistance R 6, the other end of capacitor C 5 and the equal ground connection of the earth terminal of comparator, the other end of the output of comparator connecting resistance R7, after the other end of resistance R 8, be connected with the signal input part of ON-OFF control circuit, the signal output part of ON-OFF control circuit is connected with switching circuit, switching circuit is arranged on the power circuit between LED illuminating circuit and reduction voltage circuit.
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; The model of described comparator is LM393; Described thermistor R4 is the resistance of negative temperature coefficient type; 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, mains supply can be converted to the required power supply of LED by transformer and bridge rectifier, by conversion after electrical power storage in energy storage chip, export to respectively LED illuminating circuit and drive circuit by energy storage chip, 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, reach 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, when 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.
4, in the utility model, the resistance of thermistor R4 reduces along with the rising of LED temperature, thereby the pressure drop on thermistor R4 is reduced along with the rising of LED temperature, in the time that the temperature of LED is maintained within a certain range, pressure drop (being the reverse inter-input-ing voltage value of comparator) on thermistor R4 is greater than the upper limit threshold of establishing in comparator, the output signal of comparator is low level, and the ON-OFF control circuit based on high level work is failure to actuate; In the time that the temperature of LED is increased to certain value; pressure drop (being the reverse inter-input-ing voltage value of comparator) on thermistor R4 is less than the upper limit threshold of establishing in comparator; the output of comparator is high impedance; the output signal of comparator is high level; ON-OFF control circuit action based on high level work; the supply power of control switch circuitry cuts LED illuminating circuit, has protected LED not to be burned.
Brief description of the drawings
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, and 4 is LED illuminating circuit, and 5 is energy storage chip, and 6 is control chip, and 7 is reduction voltage circuit, and 8 is comparator, and 9 is ON-OFF control circuit, and 10 is overheating protection circuit, and 11 is switching circuit.
Embodiment
As shown in Figure 1, LED circuit, comprise power circuit 1, drive circuit 2, control circuit 3, LED illuminating circuit 4 and overheating protection circuit 10, 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, can between described transformer and bridge rectifier, be connected in series a resistance R 2, described energy storage chip 5 is powered to LED illuminating circuit 4 and overheating protection circuit 10 by the first output OUT1, power to drive circuit 2 by the second output OUT2, 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 and connect one end of inductance L 2 after 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 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 with after control circuit 3 electrical connections, the earth terminal GND ground connection of described control chip 6, described control chip 6 can be CAT4201 chip, the power end of described control chip 6 is that VBT end, the first control end are that SW end, the second control end are CTRL end, in addition described control chip 6 also has reset terminal RSET, ground connection after described reset terminal RSET tandem electric inductance L1,
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;
Described LED illuminating circuit 4 comprises at least one LED branch road;
Described overheating protection circuit 10 comprises comparator 8, ON-OFF control circuit 9 and switching circuit 11, one end of the non-inverting input of described comparator 8 connecting resistance R5, one end of resistance R 6, behind one end of resistance R 8, be connected with one end of capacitor C 4, one end of the inverting input shunt-wound capacitance C5 of comparator 8, behind one end of thermistor R4, be connected with one end of divider resistance R3, the other end of the other end of divider resistance R3 connecting resistance R5, the power end of comparator 8, behind one end of resistance R 7, be connected with the first output OUT1 of energy storage chip 5, the other end of thermistor R4, the other end of capacitor C 4, the other end of resistance R 6, the equal ground connection of earth terminal of the other end of capacitor C 5 and comparator 8, the other end of the output of comparator 8 connecting resistance R7, after the other end of resistance R 8, be connected with the signal input part of ON-OFF control circuit 9, the signal output part of ON-OFF control circuit 9 is connected with switching circuit 11, and switching circuit 11 is arranged on the power circuit between LED illuminating circuit 4 and reduction voltage circuit 7, capacitor C 4, capacitor C 5 is respectively used to the non-inverting input to inputing to comparator 8, the voltage of inverting input carries out filtering processing.
Described divider resistance R3 and thermistor R4 form a temperature sensing circuit, and this temperature sensing circuit is used for the variations in temperature of sensing LED illuminating circuit 4 LED, and exports a corresponding voltage signal; In the present embodiment, described thermistor R4 can be the resistance of negative temperature coefficient type, its resistance reduces along with the rising of LED temperature, so, the pressure drop on thermistor R4 reduces the rising along with LED temperature, and then in order to represent the temperature of LED, in the time that the temperature of LED raises, pressure drop on thermistor R4 will reduce, and in the time that the temperature of LED reduces, the pressure drop on thermistor R4 will increase; The model of described comparator 8 can be LM393, the magnitude of voltage of its inverting input is the voltage drop value on thermistor R4, in comparator 8, prestore a upper limit threshold, in the time that comparator 8 reverse inter-input-ing voltage values are greater than this upper limit threshold, comparator 8 is exported a low level, in the time that comparator 8 reverse inter-input-ing voltage values are less than this upper limit threshold, the output of comparator 8 is high impedance, output one high level; So, in heating process, can allow the corresponding magnitude of voltage of maximum temperature values reaching to be set to described upper limit threshold by LED, described comparator 8 can compare the pressure drop on described thermistor R4 (being the reverse inter-input-ing voltage value of comparator 8) and this default upper limit threshold, heating temp and its maximum temperature that can be allowed to by LED compare, and export corresponding control signal according to comparative result; Particularly, when LED temperature is during lower than maximum temperature, the reverse inter-input-ing voltage of comparator 8 is greater than upper limit threshold, and comparator 8 output low levels pass to the ON-OFF control circuit 9 based on high level work, and ON-OFF control circuit 9 is failure to actuate; When LED temperature is during higher than maximum temperature; the reverse inter-input-ing voltage school of comparator 8 is in upper limit threshold; the output of comparator 8 is high impedance; be that comparator 8 is exported high level and passed to the ON-OFF control circuit 9 based on high level work; ON-OFF control circuit 9 is moved; control switch circuitry cuts power supply, disconnects LED illuminating circuit, has protected each LED parts.
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 can sever supply power supply in the time that LED raises self temperature due to excessive heating, 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 skill in the art, can also under the prerequisite that does not depart from aim of the present invention, makes various variations.
Claims (8)
1.LED circuit, comprise power circuit (1), drive circuit (2), control circuit (3) and LED illuminating circuit (4), it is characterized in that: described LED circuit also comprises overheating protection circuit (10), 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) and overheating protection circuit (10) by the first output OUT1, power to drive circuit (2) by the second output OUT2, 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 and connect one end of inductance L 2 after 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 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) with after control circuit (3) electrical connection, the earth terminal GND ground connection of described control chip (6),
Described overheating protection circuit (10) comprises comparator (8), ON-OFF control circuit (9) and switching circuit (11), the non-inverting input of described comparator (8) one end of connecting resistance R5, one end of resistance R 6, behind one end of resistance R 8, be connected with one end of capacitor C 4, one end of the inverting input shunt-wound capacitance C5 of comparator (8), behind one end of thermistor R4, be connected with one end of divider resistance R3, the other end of the other end of divider resistance R3 connecting resistance R5, the power end of comparator (8), behind one end of resistance R 7, be connected with the first output OUT1 of energy storage chip (5), the other end of thermistor R4, the other end of capacitor C 4, the other end of resistance R 6, the equal ground connection of earth terminal of the other end of capacitor C 5 and comparator (8), the output of comparator (8) the other end of connecting resistance R7, after the other end of resistance R 8, be connected with the signal input part of ON-OFF control circuit (9), the signal output part of ON-OFF control circuit (9) is connected with switching circuit (11), switching circuit (11) is arranged on the power circuit between LED illuminating circuit (4) and reduction voltage circuit (7).
2. LED circuit 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).
3. LED circuit according to claim 1, is characterized in that: the model of described comparator (8) is LM393.
4. LED circuit according to claim 3, is characterized in that: described thermistor R4 is the resistance of negative temperature coefficient type.
5. LED circuit according to claim 1, is characterized in that: described control chip (6) is CAT4201 chip.
6. LED circuit according to claim 5, 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.
7. LED circuit according to claim 1, is characterized in that: between described transformer and bridge rectifier, be serially connected with a resistance R 2.
8. LED circuit 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 |
|---|---|---|---|
| CN201420225572.5U CN203840612U (en) | 2014-05-05 | 2014-05-05 | Led circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420225572.5U CN203840612U (en) | 2014-05-05 | 2014-05-05 | Led circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203840612U true CN203840612U (en) | 2014-09-17 |
Family
ID=51518403
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420225572.5U Expired - Lifetime CN203840612U (en) | 2014-05-05 | 2014-05-05 | Led circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203840612U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107104415A (en) * | 2017-04-24 | 2017-08-29 | 苏州合欣美电子科技有限公司 | A kind of overtemperature protection LED circuit of wireless power |
-
2014
- 2014-05-05 CN CN201420225572.5U patent/CN203840612U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107104415A (en) * | 2017-04-24 | 2017-08-29 | 苏州合欣美电子科技有限公司 | A kind of overtemperature protection LED circuit of wireless power |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |