CN203435203U - LED driving circuit - Google Patents
LED driving circuit Download PDFInfo
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- CN203435203U CN203435203U CN201320540186.0U CN201320540186U CN203435203U CN 203435203 U CN203435203 U CN 203435203U CN 201320540186 U CN201320540186 U CN 201320540186U CN 203435203 U CN203435203 U CN 203435203U
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- circuit
- led drive
- drive circuit
- power supply
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- 239000003990 capacitor Substances 0.000 claims description 19
- 230000005669 field effect Effects 0.000 claims description 8
- 229910044991 metal oxide Inorganic materials 0.000 claims description 8
- 150000004706 metal oxides Chemical class 0.000 claims description 8
- 239000004065 semiconductor Substances 0.000 claims description 4
- 238000005457 optimization Methods 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001427 coherent effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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Abstract
The utility model discloses an LED driving circuit, which comprises a buck-boost switching circuit, a control circuit and a total harmonic distortion (THD) optimizing circuit, wherein one end of the buck-boost switching circuit is connected with a power supply, and the other end is connected with the control circuit; one end of the control circuit is connected with the buck-boost switching circuit, and the other end is connected with the total harmonic distortion (THD) optimizing circuit; and one end of the total harmonic distortion (THD) optimizing circuit is connected with the power supply, and the other end is connected with the control circuit. According to the LED driving circuit provided by the utility model, the problems such as low energy utilization rate and large transmission loss existing in the current LED driving schemes can be overcame.
Description
Technical field
The utility model relates to circuit field, relates more specifically to a kind of LED drive circuit.
Background technology
Light-emitting diode (LED) technology has reached its maturity and due to it, has had the features such as luminous efficiency is high, long service life at present, so it is very urgent to replace traditional incandescent lamp on lighting field.But, at the low-power LED such as existing Lamp cup, fluorescent tube with in Switching Power Supply scheme, the shortcoming such as ubiquity power factor is low, harmonic component is high.Because low power factor, higher harmonic wave component can cause the problems such as the harmonic energy in electrical network is large, energy utilization rate is low, loss is large, thereby increase the weight of electrical network burden.
Utility model content
One or more problems in view of the above, the utility model provides a kind of LED drive circuit of novelty.
According to the LED drive circuit of the utility model embodiment, comprise buck switching circuit, control circuit and total harmonic distortion (THD) optimized circuit.Wherein, buck switching circuit one end is connected with power supply, and the other end is connected with control circuit; Control circuit one end is connected with buck switching circuit, and the other end is connected with total harmonic distortion circuit; And total harmonic distortion circuit one end is connected with power supply, and the other end is connected with control circuit.
According to the LED drive circuit of the utility model embodiment, can overcome the problems such as the energy utilization rate existing in existing LED drive scheme is low, loss is large.
Accompanying drawing explanation
Below in conjunction with accompanying drawing to understanding better the utility model in the description of embodiment of the present utility model, wherein:
Fig. 1 shows according to the circuit diagram of the LED drive circuit of the utility model embodiment;
Fig. 2 shows according to the circuit diagram of the LED drive circuit of another embodiment of the utility model.
Embodiment
Feature and the exemplary embodiment of the utility model various aspects will be described in detail below.Many details have been contained in description below, to provide complete understanding of the present utility model.But, it will be apparent to one skilled in the art that the utility model can be in the situation that do not need some details in these details to implement.Below the description of embodiment is only used to provide the clearer understanding of the utility model by example of the present utility model is shown.The utility model is never limited to any concrete configuration proposing below, but under the prerequisite that does not depart from spirit of the present utility model, has covered any modification, replacement and the improvement of coherent element or parts.
According to the LED drive circuit of utility model embodiment, it is buck (BUCK-BOOST) circuit based on common exploitation.Below in conjunction with Fig. 1 and Fig. 2, describe in detail according to the LED drive circuit of the utility model embodiment.
Fig. 1 shows according to the circuit diagram of the LED drive circuit of the utility model embodiment.As shown in Figure 1, according to the LED drive circuit of the utility model embodiment, comprise buck (BUCK-BOOST) switching circuit 1, control circuit 2 and total harmonic distortion (THD) optimized circuit 3.Wherein:
BUCK-BOOST switching circuit 1 comprises filter capacitor C1, C2, inductance L 1, metal oxide layer semiconductor field-effect transistor (MOSFET) Q1, rectifier diode D1, and current sensing resistor Rs.Wherein, filter capacitor C1 is connected between power supply Vin and ground, source electrode and drain electrode, inductance L 1 and the current sensing resistor Rs of MOSFET pipe Q1 are connected between power supply Vin and ground, and filter capacitor C2 and rectifier diode D1 are connected between power supply Vin and the drain electrode and the connected node between inductance L 1 of MOSFET pipe Q1.
Loop compensation pin (COMP pin), external capacitor C4 arrives ground, and is coupled to the output of the error amplifier of adjusting for output current in PWM chip U1;
Drive pin (GATE pin), be connected to the grid of the MOSFET pipe Q1 in BUCK-BOOST switching circuit 1, in order to driven MOS FET pipe Q1;
Current detecting pin (CS pin), is connected to the source electrode of the MOSFET pipe Q1 in BUCK-BOOST switching circuit 1 and the connected node between current sensing resistor Rs; And
Grounding leg (GND pin), is connected to ground.
THD optimized circuit 3 comprises resistance R 2, R3, and capacitor C 5.Wherein, R2 one end is connected to the anode of the capacitor C 1 in BUCK-BOOST switching circuit 1, and the other end is connected to one end of R3, and the other end of R3 is connected to chip ground.The connected node of R2 and R3 is connected to one end of capacitor C 5, and the other end of capacitor C 5 is connected to the COMP pin of the PWM chip U1 in control circuit 2.
In the LED drive circuit shown in Fig. 1, LED load is in parallel with the filter capacitor C2 in BUCK-BOOST switching circuit 1.By THD, optimize circuit 3 and can make the phase place of COMP pin and input voltage dwindle, and by the ripple of COMP pin, compensate the wave distortion of input current, can improve power factor, reduce harmonic component.
Fig. 2 shows according to the LED drive circuit of another embodiment of the utility model.Can find out, the difference of the LED drive circuit shown in the LED drive circuit shown in Fig. 2 and Fig. 1 is mainly, the connected mode of BUCK-BOOST switching circuit 1.Particularly, filter capacitor C1 is connected between power supply Vin and ground, the source electrode of MOSFET pipe Q1 and drain electrode and inductance L 1 are connected between power supply Vin and ground, current sense inductance Rs, filter capacitor C2 and rectifier diode D1 are connected between the source electrode and connected node and ground between inductance L 1 of MOSFET pipe Q1, and the source electrode of MOSFET pipe Q1 and the connected node between inductance L 1 are connected with reference ground.In the LED drive circuit shown in Fig. 2, the CS pin of PWM chip U1 is connected to the connected node between current sensing resistor Rs and filter capacitor C2 in addition.Equally, in the LED drive circuit shown in Fig. 2, LED load is in parallel with the filter capacitor C2 in BUCK-BOOST switching circuit 1.By THD, optimize circuit 3 and can make the phase place of COMP pin and input voltage dwindle, and by the ripple of COMP pin, compensate the wave distortion of input current, can improve power factor, reduce harmonic component.
Below with reference to specific embodiment of the utility model, the utility model has been described, but those skilled in the art all understand, can carry out various modifications, combination and change to these specific embodiments, and can not depart from the spirit and scope of the present utility model that limited by claims or its equivalent.In addition, it is only exemplary that any signal arrows in accompanying drawing should be considered to, rather than restrictive, unless separately there is concrete indication.When term is also contemplated as when the ability of separation or combination is not known, the combination of assembly or step also will be considered to record.
Claims (9)
1. a LED drive circuit, comprises buck switching circuit, control circuit and total harmonic distortion optimization circuit, wherein:
Described buck switching circuit one end is connected with power supply, and the other end is connected with described control circuit;
Described control circuit one end is connected with described buck switching circuit, and the other end is connected with described total harmonic distortion circuit; And
Described total harmonic distortion circuit one end is connected with described power supply, and the other end is connected with described control circuit.
2. LED drive circuit according to claim 1, is characterized in that, described buck switching circuit comprises the first and second filter capacitors, inductance, metal oxide semiconductcor field effect transistor, rectifier diode and current sensing resistor.
3. LED drive circuit according to claim 1 and 2, is characterized in that, described control circuit comprises pulse width modulating chip and the first electric capacity, and wherein, the loop compensation pin of described pulse width modulating chip is connected to ground via described the first electric capacity.
4. LED drive circuit according to claim 3, is characterized in that, described total harmonic distortion circuit comprises the first and second resistance and the second electric capacity.
5. LED drive circuit according to claim 3, is characterized in that, the grid of the metal oxide semiconductcor field effect transistor in described buck switching circuit is connected with the driving pin of described pulse width modulating chip in described control circuit.
6. LED drive circuit according to claim 4, it is characterized in that, in described total harmonic distortion circuit, described the first and second resistance are connected between described power supply and ground, and the connected node between described the first and second resistance is connected with the described loop compensation pin of described pulse width modulating chip via described the second electric capacity.
7. LED drive circuit according to claim 2, it is characterized in that, in described buck switching circuit, described the first filter capacitor is connected between described power supply and ground, the source electrode of described metal oxide semiconductcor field effect transistor and drain electrode, and described inductance is connected between described power supply and ground, described current sensing resistor, described the second filter capacitor, and described rectifier diode is connected between the source/drain of described metal oxide semiconductor field effect tube and connected node and ground between described inductance, connected node between the source/drain of described metal oxide semiconductor field effect tube and described inductance is connected with reference ground.
8. LED drive circuit according to claim 2, it is characterized in that, in described buck switching circuit, described the first filter capacitor is connected between described power supply and ground, the source electrode of described metal oxide semiconductcor field effect transistor and drain electrode, described inductance and described current sensing resistor are connected between described power supply and ground, and described the second filter capacitor and described rectifier diode are connected between the source/drain and the connected node between described inductance of described power supply and described metal oxide semiconductor field effect tube.
9. according to the LED drive circuit described in claim 7 or 8, it is characterized in that, LED load by with described buck switching circuit in described the second filter capacitor be connected in parallel, LED drive circuit drives described in cause.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320540186.0U CN203435203U (en) | 2013-08-30 | 2013-08-30 | LED driving circuit |
| TW102219256U TWM477747U (en) | 2013-08-30 | 2013-10-16 | LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320540186.0U CN203435203U (en) | 2013-08-30 | 2013-08-30 | LED driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203435203U true CN203435203U (en) | 2014-02-12 |
Family
ID=50064212
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320540186.0U Expired - Lifetime CN203435203U (en) | 2013-08-30 | 2013-08-30 | LED driving circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN203435203U (en) |
| TW (1) | TWM477747U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103956789A (en) * | 2014-04-25 | 2014-07-30 | 桂林市啄木鸟医疗器械有限公司 | Voltage stabilization power supply circuit of photo-curing machine LED lamp |
| CN119233469A (en) * | 2024-11-22 | 2024-12-31 | 南昌大学 | Driving power supply control circuit, control method and lighting application method |
-
2013
- 2013-08-30 CN CN201320540186.0U patent/CN203435203U/en not_active Expired - Lifetime
- 2013-10-16 TW TW102219256U patent/TWM477747U/en not_active IP Right Cessation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103956789A (en) * | 2014-04-25 | 2014-07-30 | 桂林市啄木鸟医疗器械有限公司 | Voltage stabilization power supply circuit of photo-curing machine LED lamp |
| CN119233469A (en) * | 2024-11-22 | 2024-12-31 | 南昌大学 | Driving power supply control circuit, control method and lighting application method |
Also Published As
| Publication number | Publication date |
|---|---|
| TWM477747U (en) | 2014-05-01 |
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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: 20140212 |