CN204598415U - A kind of overload protecting circuit of LED drive power - Google Patents
A kind of overload protecting circuit of LED drive power Download PDFInfo
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- CN204598415U CN204598415U CN201520306492.7U CN201520306492U CN204598415U CN 204598415 U CN204598415 U CN 204598415U CN 201520306492 U CN201520306492 U CN 201520306492U CN 204598415 U CN204598415 U CN 204598415U
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Abstract
The utility model discloses a kind of overload protecting circuit of LED drive power, wherein, described overload protecting circuit comprises inductance, metal-oxide-semiconductor, comparison module, current limliting module, sampling module and Voltage stabilizing module.Described overload protecting circuit; when outside LED group overload; the protection voltage higher than reference voltage is exported to the second input of comparison module by Voltage stabilizing module; the size of comparison module benchmark voltage and protection voltage; output low level signal is to the grid of metal-oxide-semiconductor; metal-oxide-semiconductor is turned off, and external LED lamp group electric current declines, and protective device product and external LED lamp group are not damaged by overload.
Description
Technical field
The utility model relates to LED Driving technique field, particularly a kind of overload protecting circuit of LED drive power.
Background technology
Existing LED circuit usually can only current stabilization, does not possess output pressure-limiting function, when the LED group accessed is in overload, constant current electric equipment products can be caused to transship and export, easily damage the electronic component in circuit.
Thus prior art need to improve.
Utility model content
In view of above-mentioned the deficiencies in the prior art part, the purpose of this utility model is the overload protecting circuit providing a kind of LED drive power, can arrange maximum output protection voltage, when accessing overload load, and protective device product and external LED lamp group.
In order to achieve the above object, the utility model takes following technical scheme:
An overload protecting circuit for LED drive power, comprising:
Inductance;
Metal-oxide-semiconductor;
For the size of the voltage that the voltage and the second input that compare first input end input input, when the voltage of first input end input is greater than the voltage of the second input input, export high level; When the voltage of first input end input is less than the voltage of the second input input, the comparison module of output low level;
For the current sample to outside LED group, export the sampling module of sampled voltage;
For the current limliting module of current limliting;
For when outside LED group is transshipped, the Voltage stabilizing module of output protection voltage;
Described externally fed end connects the positive pole of external LED lamp group and the input of Voltage stabilizing module by inductance, the negative pole of described external LED lamp group connects the drain electrode of metal-oxide-semiconductor, the grid of described metal-oxide-semiconductor connects the output of comparison module, the first input end of described comparison module connects external reference voltages feeder ear, second input of described comparison module by the source electrode of current limliting model calling metal-oxide-semiconductor, one end of sampling module and the output of Voltage stabilizing module, the other end ground connection of described sampling module.
In the overload protecting circuit of described LED drive power; described Voltage stabilizing module comprises voltage stabilizing didoe and the first resistance; the negative pole of described voltage stabilizing didoe be Voltage stabilizing module input, connect external LED lamp group positive pole, also connect externally fed end by inductance; the positive pole of described voltage stabilizing didoe connects one end of the first resistance, and the other end of described first resistance is the output of Voltage stabilizing module, one end of the source electrode connecting metal-oxide-semiconductor, sampling module, also connected the second input of comparison module by flow-restriction.
In the overload protecting circuit of described LED drive power; described comparison module comprises comparator; the normal phase input end of described comparator connects external reference voltages feeder ear, and the inverting input of described comparator passes through the source electrode of current limliting model calling metal-oxide-semiconductor, the other end of the first resistance and one end of sampling module.
In the overload protecting circuit of described LED drive power; described current limliting module comprises the second resistance; one end of described second resistance connects the inverting input of comparator, and the other end of described second resistance connects the source electrode of metal-oxide-semiconductor, the other end of the first resistance and one end of sampling module.
In the overload protecting circuit of described LED drive power, described sampling module comprises the 3rd resistance, and one end of described 3rd resistance connects the other end of the other end of the first resistance, the source electrode of metal-oxide-semiconductor and the second resistance, the other end ground connection of described 3rd resistance.
In the overload protecting circuit of described LED drive power, described metal-oxide-semiconductor is N-channel MOS pipe.
In the overload protecting circuit of described LED drive power, described external LED lamp group comprises at least one LED light-emitting diode.
Compared to prior art; the overload protecting circuit of the LED drive power that the utility model provides; when outside LED group overload; the protection voltage higher than reference voltage is exported to the second input of comparison module by Voltage stabilizing module; the size of comparison module benchmark voltage and protection voltage, output low level signal, to the grid of metal-oxide-semiconductor, makes metal-oxide-semiconductor turn off; external LED lamp group electric current declines, and protective device product and external LED lamp group are not damaged by overload.
Accompanying drawing explanation
The circuit diagram of the overload protecting circuit of the LED drive power that Fig. 1 provides for the utility model.
Embodiment
The utility model provides a kind of overload protecting circuit of LED drive power, by Voltage stabilizing module output protection voltage when outside LED group is transshipped, controls metal-oxide-semiconductor turn off by comparison module, and protective device product and external LED lamp group are by overload damage.
For making the purpose of this utility model, technical scheme and effect clearly, clearly, referring to the accompanying drawing embodiment that develops simultaneously, the utility model is further described.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Refer to Fig. 1, the overload protecting circuit of the LED drive power that the utility model provides, comprise inductance L 1, metal-oxide-semiconductor Q1, comparison module 20, current limliting module 30, sampling module 40 and Voltage stabilizing module 50.Described metal-oxide-semiconductor Q1 is N-channel MOS pipe.Described external LED lamp group 10 comprises at least one LED light-emitting diode.
Described comparison module 20, the size of the voltage that voltage and the second input for comparing first input end input input, when the voltage of first input end input is greater than the voltage of the second input input, exports high level; When the voltage of first input end input is less than the voltage of the second input input, output low level.
Described current limliting module 30, for current limliting, prevents the excessive infringement comparison module of immediate current.
Described sampling module 40, for the current sample to outside LED group 10, exports sampled voltage.
Voltage stabilizing module 50, for when outside LED group 10 is transshipped, output protection voltage.
Described externally fed end VCC connects the positive pole of external LED lamp group 10 and the input of Voltage stabilizing module 50 by inductance L 1, the negative pole of described external LED lamp group 10 connects the drain electrode of metal-oxide-semiconductor Q1, the grid of described metal-oxide-semiconductor Q1 connects the output of comparison module 20, the first input end 1 of described comparison module 20 connects external reference voltages feeder ear J1, second input 2 of described comparison module 20 connects the output of the source electrode of metal-oxide-semiconductor Q1, one end of sampling module 40 and Voltage stabilizing module 50 by current limliting module 30, the other end ground connection of described sampling module 40.
When external LED lamp group 10 is in overload; the input of Voltage stabilizing module 50 detects that external LED lamp group 10 is transshipped; Voltage stabilizing module 50 output protection voltage; when protecting voltage to exceed reference voltage; comparison module controls metal-oxide-semiconductor and turns off; thus turning off the circuit of whole external LED lamp group 10, the components and parts in protective circuit and external LED lamp group 10 are not damaged by overload.
Please continue to refer to Fig. 1, described Voltage stabilizing module 50 comprises voltage stabilizing didoe D1 and the first resistance R1, the negative pole of described voltage stabilizing didoe D1 be Voltage stabilizing module 50 input, connect external LED lamp group 10 positive pole, also connect externally fed end VCC by inductance L 1, the positive pole of described voltage stabilizing didoe D1 connects one end of the first resistance R1, and the other end of described first resistance R1 is the output of Voltage stabilizing module 50, one end of the source electrode connecting metal-oxide-semiconductor Q1, sampling module 40, also connected the second input 2 of comparison module 20 by flow-restriction 30.
When outside LED group 10 is transshipped; voltage stabilizing didoe D1 reverse-conducting; voltage stabilizing didoe D1 and the first resistance R1 makes external LED lamp group 10 and metal-oxide-semiconductor Q1 short circuit; the voltage (namely protecting voltage) of the first resistance R1 other end uprises; the second input 2 of comparison module 20 is input to by current limliting module 30; protection voltage arranges higher than reference voltage, makes comparison module 20 output low level control metal-oxide-semiconductor Q1 and turns off, protection external LED lamp group 10.It can thus be appreciated that, by changing the value of voltage stabilizing didoe D1, that is, by choosing different voltage stabilizing didoe D1, different protection voltage can be set.Certainly, also the first resistance R1 can be set to variable resistor, by changing variable-resistance resistance, different protection voltage be set, improve the adaptive capacity of external LED lamp group 10.
Further, described comparison module 20 comprises comparator U1, the normal phase input end of described comparator U1 connects external reference voltages feeder ear J1, and the inverting input of described comparator U1 connects the source electrode of metal-oxide-semiconductor Q1, the other end of the first resistance R1 and one end of sampling module 40 by current limliting module 30.
Described current limliting module 30 comprises the second resistance R2, and one end of described second resistance R2 connects the inverting input of comparator U1, and the other end of described second resistance R2 connects the source electrode of metal-oxide-semiconductor Q1, the other end of the first resistance R1 and one end of sampling module 40.
Described sampling module 40 comprises the 3rd resistance R3, and one end of described 3rd resistance R3 connects the other end of the other end of the first resistance R1, the source electrode of metal-oxide-semiconductor Q1 and the second resistance R2, the other end ground connection of described 3rd resistance R3.
In practical application, the setting parameter of above each element can be preferably: inductance L 1:EFD25,0.8mH; Metal-oxide-semiconductor Q1:FTD6N60; There is comparator module comparator module U1:MPS4688(inside); Resistance R1:10K; Resistance R2:10K; Resistance R3:1 ohm; Voltage stabilizing didoe D1:42V.
Be understandable that; for those of ordinary skills; can be equal to according to the technical solution of the utility model and utility model design thereof and replace or change, and all these change or replace the protection range that all should belong to the claim appended by the utility model.
Claims (7)
1. an overload protecting circuit for LED drive power, is characterized in that, comprising:
Inductance;
Metal-oxide-semiconductor;
For the size of the voltage that the voltage and the second input that compare first input end input input, when the voltage of first input end input is greater than the voltage of the second input input, export high level; When the voltage of first input end input is less than the voltage of the second input input, the comparison module of output low level;
For the current sample to outside LED group, export the sampling module of sampled voltage;
For the current limliting module of current limliting;
For when outside LED group is transshipped, the Voltage stabilizing module of output protection voltage;
Described externally fed end connects the positive pole of external LED lamp group and the input of Voltage stabilizing module by inductance, the negative pole of described external LED lamp group connects the drain electrode of metal-oxide-semiconductor, the grid of described metal-oxide-semiconductor connects the output of comparison module, the first input end of described comparison module connects external reference voltages feeder ear, second input of described comparison module by the source electrode of current limliting model calling metal-oxide-semiconductor, one end of sampling module and the output of Voltage stabilizing module, the other end ground connection of described sampling module.
2. the overload protecting circuit of LED drive power according to claim 1; it is characterized in that; described Voltage stabilizing module comprises voltage stabilizing didoe and the first resistance; the negative pole of described voltage stabilizing didoe be Voltage stabilizing module input, connect external LED lamp group positive pole, also connect externally fed end by inductance; the positive pole of described voltage stabilizing didoe connects one end of the first resistance, and the other end of described first resistance is the output of Voltage stabilizing module, one end of the source electrode connecting metal-oxide-semiconductor, sampling module, also connected the second input of comparison module by flow-restriction.
3. the overload protecting circuit of LED drive power according to claim 2; it is characterized in that; described comparison module comprises comparator; the normal phase input end of described comparator connects external reference voltages feeder ear, and the inverting input of described comparator passes through the source electrode of current limliting model calling metal-oxide-semiconductor, the other end of the first resistance and one end of sampling module.
4. the overload protecting circuit of LED drive power according to claim 3; it is characterized in that; described current limliting module comprises the second resistance; one end of described second resistance connects the inverting input of comparator, and the other end of described second resistance connects the source electrode of metal-oxide-semiconductor, the other end of the first resistance and one end of sampling module.
5. the overload protecting circuit of LED drive power according to claim 4; it is characterized in that; described sampling module comprises the 3rd resistance, and one end of described 3rd resistance connects the other end of the other end of the first resistance, the source electrode of metal-oxide-semiconductor and the second resistance, the other end ground connection of described 3rd resistance.
6. the overload protecting circuit of LED drive power according to claim 5, is characterized in that, described metal-oxide-semiconductor is N-channel MOS pipe.
7. the overload protecting circuit of LED drive power according to claim 6, is characterized in that, described external LED lamp group comprises at least one LED light-emitting diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520306492.7U CN204598415U (en) | 2015-05-13 | 2015-05-13 | A kind of overload protecting circuit of LED drive power |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520306492.7U CN204598415U (en) | 2015-05-13 | 2015-05-13 | A kind of overload protecting circuit of LED drive power |
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| CN204598415U true CN204598415U (en) | 2015-08-26 |
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| CN201520306492.7U Active CN204598415U (en) | 2015-05-13 | 2015-05-13 | A kind of overload protecting circuit of LED drive power |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108966430A (en) * | 2018-08-31 | 2018-12-07 | 广东工业大学 | A kind of LED illumination lamp linear drive circuit of high photosynthetic efficiency |
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2015
- 2015-05-13 CN CN201520306492.7U patent/CN204598415U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108966430A (en) * | 2018-08-31 | 2018-12-07 | 广东工业大学 | A kind of LED illumination lamp linear drive circuit of high photosynthetic efficiency |
| CN108966430B (en) * | 2018-08-31 | 2020-06-30 | 广东工业大学 | Linear driving circuit of LED lighting lamp |
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