CN204090205U - Based on the low-power consumption LED drive circuit that PWM controls - Google Patents
Based on the low-power consumption LED drive circuit that PWM controls Download PDFInfo
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- CN204090205U CN204090205U CN201420246789.4U CN201420246789U CN204090205U CN 204090205 U CN204090205 U CN 204090205U CN 201420246789 U CN201420246789 U CN 201420246789U CN 204090205 U CN204090205 U CN 204090205U
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Abstract
The utility model belongs to LED and controls driving field, relates to a kind of low-power consumption LED drive circuit controlled based on PWM, comprises MCU, NMOS tube, energy storage inductor, LED.The I/O pin of MCU is connected with the grid of NMOS tube VM1, and the source electrode of NMOS tube VM1 is connected to ground, and cross-over connection bleeder resistance R1 between the grid of NMOS tube VM1 and source electrode; After LED HL1 is in parallel with inductance L 1, the positive pole of LED HL1 and the drain series of VM1, negative pole meets power supply+V.MCU periodically controls conducting and the cut-off of NMOS tube VM1, utilizes energy storage and the afterflow effect of inductance L 1, reduces power supply power consumption.
Description
Technical field
The control that the utility model relates to LED drives field, particularly relates to a kind of low-power consumption LED drive circuit controlled based on PWM.
Background technology
Along with the development of science and technology grows, New Products & New Technology is constantly reformed, as the LED of new type light source, there is the advantage that its low current power consumption and longer life etc. are unique, technology is ripe and be applied to every field, LED is widely used in daily life as light source, has also occurred various LED drive circuit thereupon.
At present, all can there is some weak point following in a lot of LED drive circuit on the market:
1) circuit is comparatively complicated;
2) antijamming capability is poor;
3) power consumption is higher, is difficult to be applicable to the lower occasion of product power consumption requirements.
This low-power consumption LED drive circuit controlled based on PWM, periodically controls conducting and the cut-off of controllable switch element, and utilizes the energy storage effect of perceptual energy-storage travelling wave tube, reduces the loss of energy.In a word, the utility model designs to solve current LED drive circuit Problems existing on the market.
Utility model content
Of the present utility modelly be characterised in that, a kind of low-power consumption LED drive circuit controlled based on PWM, comprising:
PWM output circuit, MCU etc. can the circuit of periodically output pwm signal;
Gate-controlled switch circuit, the controllable switch element such as metal-oxide-semiconductor, triode;
Accumulator, the perceptual energy-storage travelling wave tube such as inductance;
DC power supply, electric energy needed for supply LED;
Wherein said PWM output circuit is connected with gate-controlled switch circuit, periodically controls conducting and the cut-off of controllable switch element; After LED is in parallel with accumulator, one end connects gate-controlled switch circuit, and one end connects DC power supply.
The cycle of pwm signal should be not long, such as cycle 2ms or shorter.
In order to prevent LED from bearing larger reverse voltage, the gate-controlled switch circuit turn-on time should be not long, and namely the duty ratio of pwm signal should not be excessive.
LED has the effect of afterflow, can prevent that gate-controlled switch circuit voltage is too high causes damage.
Gate-controlled switch circuit needs higher withstand voltage, is such as resistance toly pressed in 100V or more.
LED needs higher oppositely withstand voltage.
DC power supply can access different magnitudes of voltage according to different electric power systems.
LED can carry out connection in series-parallel combination according to the actual requirements.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the utility model first embodiment;
Fig. 2 is the oscillogram of the pwm signal of the utility model first embodiment;
Fig. 3 is the schematic diagram of the utility model second embodiment;
Fig. 4 is the schematic diagram of the utility model the 3rd embodiment.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail, but not as to restriction of the present utility model.
As shown in Figure 1, the first embodiment of the present utility model is, a kind of low-power consumption LED drive circuit controlled based on PWM, comprises MCU, metal-oxide-semiconductor, energy storage inductor, LED.
Be connected from the I/O pin of MCU, MCU with the grid of metal-oxide-semiconductor VM1, the source electrode of metal-oxide-semiconductor VM1 is connected to ground, and cross-over connection bleeder resistance R1 between the grid of metal-oxide-semiconductor VM1 and source electrode.Such as, resistance R1 is 1M Ω.
From DC power supply+V, DC power supply+V is connected with the negative pole of LED HL1, after LED HL1 is in parallel with inductance L 1, then with the drain series of metal-oxide-semiconductor VM1.Such as, inductance L 1 is 1mH/10mA.
As shown in Figure 1 and Figure 2, the I/O pin of MCU produces pwm signal, and such as, high level is 6.2us, the cycle is the pwm signal of 2ms.When I/O pin is high level, the grid of metal-oxide-semiconductor VM1 and source conduction, the now drain electrode of metal-oxide-semiconductor VM1 and source conduction, metal-oxide-semiconductor VM1 opens, DC power supply+V and energy storage inductor L1, metal-oxide-semiconductor VM1 form path, and the moment of conducting produces very large electric current, because inductance has the effect preventing current break, therefore inductance L 1 produces induced current to suppress by the electric current in coil, now inductance stored energy.When I/O pin is low level, the grid of metal-oxide-semiconductor VM1 and source electrode are closed, the now drain electrode of metal-oxide-semiconductor VM1 and source electrode are closed, metal-oxide-semiconductor VM1 closes, because inductance has the effect preventing current break, therefore inductance L 1 produces induced current to suppress by the electric current in coil, and inductance L 1 and LED HL1 form loop, inductance L 1 and LED HL1 have the effect of afterflow in the process, and now inductance releases energy.
The discharge time that described inductance releases energy, the namely ON time of LED HL1, and ON time is determined jointly by the pressure drop when On current of LED HL1 and conducting, the LED that pressure drop when therefore can choose On current and conducting is less.
As shown in Figure 3, the second embodiment of the present utility model is, a kind of low-power consumption LED drive circuit controlled based on PWM, comprises MCU, metal-oxide-semiconductor, energy storage inductor, multiple LED, current-limiting resistance.The present embodiment is the expansion in the first embodiment, can drive multiple LED according to actual needs.In addition, the present embodiment is substantially identical with the operation principle of the first embodiment, will repeat no more.
As shown in Figure 4, the 3rd embodiment of the present utility model is, a kind of low-power consumption LED drive circuit controlled based on PWM, comprises MCU, metal-oxide-semiconductor, fly-wheel diode, energy storage inductor, multiple LED, current-limiting resistance.
Be connected from the I/O pin of MCU, MCU with the grid of metal-oxide-semiconductor VM3, the source electrode of metal-oxide-semiconductor VM3 is connected to ground, and cross-over connection bleeder resistance R5 between the grid of metal-oxide-semiconductor VM3 and source electrode.Such as, resistance R5 is 2M Ω.
After LED HL8, HL9, HL10 and resistance R6 connect, in parallel with the series circuit that LED HL11, HL12, HL13 and resistance R7 are formed, then connect with energy storage inductor L3, finally in parallelly with diode D1 again form network.Such as, inductance L 3 is 220 μ H/280mA.
From DC power supply+V, DC power supply+V is connected with the negative pole of diode D1, then is connected with the drain electrode of metal-oxide-semiconductor VM3.Such as, diode is 1N4148W.
As shown in Figure 4, the I/O pin of MCU produces pwm signal.When I/O pin is high level, the grid of metal-oxide-semiconductor VM3 and source conduction, the now drain electrode of metal-oxide-semiconductor VM3 and source conduction, metal-oxide-semiconductor VM3 opens, DC power supply+V and LED, current-limiting resistance, energy storage inductor L3 form path, generation current, because inductance has the effect preventing current break, therefore inductance L 3 produces induced current to suppress by the electric current in coil, now inductance stored energy.When I/O pin is low level, the grid of metal-oxide-semiconductor VM3 and source electrode are closed, the now drain electrode of metal-oxide-semiconductor VM3 and source electrode are closed, metal-oxide-semiconductor VM3 closes, because inductance has the effect preventing current break, therefore inductance L 3 produces induced current to suppress by the electric current in coil, inductance L 3 and LED, current-limiting resistance, energy storage inductor L3, diode D1 form loop, and now inductance releases energy.
The operation principle important difference of the 3rd embodiment and first and second embodiment is, the lighting time of LED is different.In first and second embodiment, during the energy that rear inductance L 1 release of metal-oxide-semiconductor closedown stores, LED just has electric current to flow through; And in the 3rd embodiment, MOS opens or closes all has electric current to flow through, when metal-oxide-semiconductor is opened, DC power supply+V and LED, current-limiting resistance, energy storage inductor L3 form path, LED has electric current to flow through, and when MOS closes, inductance L 3 and LED, current-limiting resistance, energy storage inductor L3, diode D1 form loop, inductance L 3 releases energy, and LED also has electric current to flow through.
The foregoing is only embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every utilize the utility model specification and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (3)
1., based on the low-power consumption LED drive circuit that PWM controls, comprising:
PWM output circuit, gate-controlled switch circuit, accumulator, DC power supply;
Wherein said PWM output circuit is connected with gate-controlled switch circuit, periodically controls conducting and the cut-off of controllable switch element; After LED is in parallel with accumulator, one end connects gate-controlled switch circuit, and one end connects DC power supply.
2. the low-power consumption LED drive circuit controlled based on PWM according to claim 1, is characterized in that: described LED has the effect of afterflow, can prevent that gate-controlled switch circuit voltage is too high causes damage.
3. the low-power consumption LED drive circuit controlled based on PWM according to claim 1, is characterized in that: described LED can carry out connection in series-parallel combination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420246789.4U CN204090205U (en) | 2014-05-15 | 2014-05-15 | Based on the low-power consumption LED drive circuit that PWM controls |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420246789.4U CN204090205U (en) | 2014-05-15 | 2014-05-15 | Based on the low-power consumption LED drive circuit that PWM controls |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204090205U true CN204090205U (en) | 2015-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420246789.4U Expired - Lifetime CN204090205U (en) | 2014-05-15 | 2014-05-15 | Based on the low-power consumption LED drive circuit that PWM controls |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113114197A (en) * | 2021-04-30 | 2021-07-13 | 石家庄宇飞电子有限公司 | Analog inductance circuit |
| CN114141221A (en) * | 2021-12-03 | 2022-03-04 | 蚌埠依爱消防电子有限责任公司 | Low-power consumption buzzer drive circuit based on PWM control |
-
2014
- 2014-05-15 CN CN201420246789.4U patent/CN204090205U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113114197A (en) * | 2021-04-30 | 2021-07-13 | 石家庄宇飞电子有限公司 | Analog inductance circuit |
| CN114141221A (en) * | 2021-12-03 | 2022-03-04 | 蚌埠依爱消防电子有限责任公司 | Low-power consumption buzzer drive circuit based on PWM control |
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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: 20150107 |
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| DD01 | Delivery of document by public notice |
Addressee: QINGDAO TOPSCOMM COMMUNICATION Co.,Ltd. Person in charge of patents Document name: Notice of Termination of Patent Rights |