CN204795768U - LED constant -current drive circuit - Google Patents
LED constant -current drive circuit Download PDFInfo
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- CN204795768U CN204795768U CN201520496018.5U CN201520496018U CN204795768U CN 204795768 U CN204795768 U CN 204795768U CN 201520496018 U CN201520496018 U CN 201520496018U CN 204795768 U CN204795768 U CN 204795768U
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- comparator
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- semiconductor
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Abstract
The utility model discloses a LED constant -current drive circuit, including the power input end, power input end link to each other with the anodal of load through resistance, the drain electrode of passing through inductance and MOS pipe of the negative pole of load link to each other, the resistance both ends connect respectively on the input of comparator, the output of comparator connect and to serve at hysteresis comparator's non inverting input, hysteresis comparator's the output grid that passes through drive circuit and MOS pipe link to each other, the source electrode ground connection of MOS pipe, the drain electrode of MOS pipe connect on the positive pole of diode, the inverting input end of negative pole and comparator of diode link to each other, hysteresis comparator's reverse input end and power input end between be connected with offset voltage and supply with the circuit, it can be realized LED's constant current drive and power high -usage.
Description
Technical field
The utility model relates to LED drive circuit field, more particularly, relates to a kind of constant current driver circuit for LED.
Background technology
Along with the development of LED technology, great power LED obtains general use in the field such as light decoration and illumination, and power-type LED driving chip also seems more and more important simultaneously.Brightness due to LED exports and is directly proportional to the electric current by LED, and luminosity, colourity affect comparatively large by electric current, and therefore LED drive power needs for LED provides stable constant current to export.How to realize the utilance driving, improve power supply to the constant current of LED, it is quite important.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of constant current driver circuit for LED, and it can realize the constant current driving of LED and power utilization rate is high.
The technical scheme in the invention for solving the above technical problem is:
A kind of constant current driver circuit for LED, comprise power input, described power input is connected with the positive pole of load by resistance, the negative pole of described load is connected with the drain electrode of metal-oxide-semiconductor by inductance, described resistance two ends are connected on the input of comparator, the output of described comparator is connected on the in-phase input end of hysteresis comparator, the output of described hysteresis comparator is connected with the grid of metal-oxide-semiconductor by drive circuit, the source ground of described metal-oxide-semiconductor, the drain electrode of described metal-oxide-semiconductor is connected on the positive pole of diode, the negative pole of described diode is connected with the inverting input of comparator, bias voltage supply circuit is connected with between the reverse input end of described hysteresis comparator and power input.
Inductance of the present utility model, resistance, diode form the constant-current LED controller of free-running continuous inductive current pattern.In the pressure reduction change at the two ends of resistance of the reacting condition of the drive current of load LED, when circuit normally works, can to be sampled the electric current in load LED be translated into a certain proportion of sampled voltage by sampling resistor, the volume bias voltage that sampled voltage provides through hysteresis comparator and reverse input end bias voltage supply circuit compares, produce control signal, control conducting and the shutoff of metal-oxide-semiconductor through drive circuit.Below constant current principle is described, when circuit design, first two current thresholds can be set to circuit, i.e. maximum current and minimum current.When power input powers on, the initial circuit of inductance and resistance is 0, and the circuit of load LED is also 0.Hysteresis comparator output is now high, metal-oxide-semiconductor conducting, and its drain potential is low, and the electric current flowing through load starts to rise.Electric current flows to ground by inductance, resistance, load and metal-oxide-semiconductor from VIN, and now the electric current rate of rise is determined by VIN, inductance, loaded pressure drop.When load circuit increases to maximum current, the output of hysteresis comparator is low, and metal-oxide-semiconductor turns off, and due to the continuity of inductive current, now, electric current flows through inductance, resistance, load and diode with another slope.When electric current drops to minimum current, metal-oxide-semiconductor turns off, and repeats a cycle, namely realizes the Hysteresis control to load, make the average current of load LED invariable.Adopt this circuit to carry out drived control to load LED, its power-efficient can reach more than 97.5%, and its power utilization rate is high.
As preferably, described metal-oxide-semiconductor is N channel enhancement field effect transistor.
As preferably, described bias voltage supply circuit is supplied with constant voltage circuit.
Further, in order to further improve the performance of this drive circuit, between the reverse input end of described hysteresis comparator and power input, also temperature protection circuit is connected with.This drive circuit is used in different environment; its ambient temperature is also different; easy components and parts are vulnerable to the impact of temperature; the magnitude of voltage of supplied with constant voltage circuit is made to raise or reduce; utilize temperature protection circuit; the temperature performance of circuit is improved, reduces variations in temperature to the impact of circuit, improve the performance of this drive circuit.
To sum up, the beneficial effects of the utility model are:
1, the utility model utilizes the current constant control of free-running continuous inductive current pattern to carry out current constant control to LED, effectively carries out constant current driving to LED.
2, circuit of the present utility model drives LED, and its power utilization rate is high, and its power-efficient can reach more than 97.5%.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with embodiment and accompanying drawing, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Embodiment 1:
A kind of constant current driver circuit for LED as shown in Figure 1, comprise power input, described power input is connected with the positive pole of load by resistance R, the negative pole of described load is connected with the drain electrode of metal-oxide-semiconductor by inductance, described resistance two ends are connected on the input of comparator A1, the output of described comparator is connected on the in-phase input end of hysteresis comparator, the output of described hysteresis comparator is connected with the grid of metal-oxide-semiconductor by drive circuit, the source ground of described metal-oxide-semiconductor, the drain electrode of described metal-oxide-semiconductor is connected on the positive pole of diode, the negative pole of described diode is connected with the inverting input of comparator, bias voltage supply circuit is connected with between the reverse input end of described hysteresis comparator A2 and power input.
Inductance, resistance, diode form the constant-current LED controller of free-running continuous inductive current pattern.In the pressure reduction change at the two ends of resistance of the reacting condition of the drive current of load LED, when circuit normally works, can to be sampled the electric current in load LED be translated into a certain proportion of sampled voltage by sampling resistor, the volume bias voltage that sampled voltage provides through hysteresis comparator and reverse input end bias voltage supply circuit compares, produce control signal, control conducting and the shutoff of metal-oxide-semiconductor through drive circuit.
Embodiment 2:
A kind of constant current driver circuit for LED as shown in Figure 1, in order to further improve the performance of drive circuit, the present embodiment has carried out refinement and optimization on the basis of above-described embodiment, and namely described metal-oxide-semiconductor is N channel enhancement field effect transistor.
Described bias voltage supply circuit is supplied with constant voltage circuit.
Also temperature protection circuit is connected with between the reverse input end of described hysteresis comparator and power input.
Temperature protection circuit can adopt and be directly proportional to temperature and form with the device that temperature is inversely proportional to, and utilizes positive and negative temperature coefficient to cancel out each other and reaches the object eliminating temperature impact.
As mentioned above, the utility model can be realized preferably.
Claims (4)
1. a constant current driver circuit for LED, comprise power input, it is characterized in that: described power input is connected with the positive pole of load by resistance, the negative pole of described load is connected with the drain electrode of metal-oxide-semiconductor by inductance, described resistance two ends are connected on the input of comparator, the output of described comparator is connected on the in-phase input end of hysteresis comparator, the output of described hysteresis comparator is connected with the grid of metal-oxide-semiconductor by drive circuit, the source ground of described metal-oxide-semiconductor, the drain electrode of described metal-oxide-semiconductor is connected on the positive pole of diode, the negative pole of described diode is connected with the inverting input of comparator, bias voltage supply circuit is connected with between the reverse input end of described hysteresis comparator and power input.
2. a kind of constant current driver circuit for LED according to claim 1, is characterized in that: described metal-oxide-semiconductor is N channel enhancement field effect transistor.
3. a kind of constant current driver circuit for LED according to claim 1, is characterized in that: described bias voltage supply circuit is supplied with constant voltage circuit.
4. a kind of constant current driver circuit for LED according to claim 3, is characterized in that: be also connected with temperature protection circuit between the reverse input end of described hysteresis comparator and power input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520496018.5U CN204795768U (en) | 2015-07-10 | 2015-07-10 | LED constant -current drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520496018.5U CN204795768U (en) | 2015-07-10 | 2015-07-10 | LED constant -current drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204795768U true CN204795768U (en) | 2015-11-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520496018.5U Expired - Fee Related CN204795768U (en) | 2015-07-10 | 2015-07-10 | LED constant -current drive circuit |
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| Country | Link |
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| CN (1) | CN204795768U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104981073A (en) * | 2015-07-10 | 2015-10-14 | 成都市宏山科技有限公司 | Constant-current drive circuit applicable to LEDs |
-
2015
- 2015-07-10 CN CN201520496018.5U patent/CN204795768U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104981073A (en) * | 2015-07-10 | 2015-10-14 | 成都市宏山科技有限公司 | Constant-current drive circuit applicable to LEDs |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| 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: 20151118 Termination date: 20160710 |