CN110996442A - LED drive circuit - Google Patents
LED drive circuit Download PDFInfo
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- CN110996442A CN110996442A CN201911223872.3A CN201911223872A CN110996442A CN 110996442 A CN110996442 A CN 110996442A CN 201911223872 A CN201911223872 A CN 201911223872A CN 110996442 A CN110996442 A CN 110996442A
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Abstract
A kind of LED drive circuit, wherein, the power module circuit includes 220VAC power, filter circuit, rectifier circuit, switch circuit and feedback circuit, the 220VAC power is connected with filter circuit, the filter circuit is connected with rectifier circuit, the rectifier circuit is connected with switch circuit, the switch circuit forms the closed loop connection with feedback circuit, in order to achieve the purpose of stabilizing the output voltage; the LED driving module circuit comprises an LED driving circuit and a CPU minimum system circuit, the CPU minimum system circuit comprises a CPU, a reset circuit, a program downloading circuit and a communication circuit, the LED driving circuit is connected with the CPU, and the CPU is respectively connected with the reset circuit, the program downloading circuit and the communication circuit; the invention can realize the driving of the LED array with 8 rows and 4 columns. Because the circuit is realized based on the switching power supply, the power consumption of the circuit is low, and meanwhile, the stability of the LED driving circuit is effectively improved by adopting the integrated LED driving chip.
Description
Technical Field
The invention relates to the technical field of drive circuit control, in particular to an LED drive circuit.
Background
At present, the LED technology has been applied to various aspects of life, and the market demand is extremely large, which also puts higher demands on the reliability of the LED driving circuit. However, most of the LED driving circuits in the current market are implemented in a discrete component manner, and reliability cannot be effectively guaranteed; meanwhile, most of power supply parts of the LED driving circuits on the market are realized by adopting voltage stabilizing chips, so that the power consumption and the cost of the circuits are high.
Disclosure of Invention
The present invention is directed to an LED driving circuit, which solves the above problems.
The technical problem solved by the invention is realized by adopting the following technical scheme:
an LED drive circuit comprises a power supply module circuit and an LED drive module circuit, wherein the power supply module circuit comprises a 220VAC power supply, a filter circuit, a rectifier circuit, a switch circuit and a feedback circuit, the 220VAC power supply is connected with the filter circuit, the filter circuit is connected with the rectifier circuit, the rectifier circuit is connected with the switch circuit, and the switch circuit and the feedback circuit form closed loop connection so as to achieve the purpose of stabilizing output voltage; the LED driving module circuit comprises an LED driving circuit and a CPU minimum system circuit, the CPU minimum system circuit comprises a CPU, a reset circuit, a program downloading circuit and a communication circuit, the LED driving circuit is connected with the CPU, and the CPU is respectively connected with the reset circuit, the program downloading circuit and the communication circuit.
In the invention, the working principle of the power module circuit is as follows: the filtering circuit carries out differential mode and common mode filtering on 220V alternating current input by a 220VAC power supply, the rectifying circuit converts the 220V alternating current into 220VDC, and the switching circuit converts the 220VDC into a 5V power supply required by the LED driving module circuit; the feedback circuit collects the voltage output by the switch circuit, then transmits a voltage feedback signal to the switch circuit, and adjusts the switch duty ratio of the switch circuit so as to achieve the purpose of stably outputting the voltage.
In the invention, the filter circuit comprises a 0.1uf/275VAC capacitor and a 3.3mH common mode magnetic ring inductor, the 0.1uf/275VAC capacitor is bridged between a zero line and a live line, and two windings of the 3.3mH common mode magnetic ring inductor are respectively connected in series on the zero line and the live line so as to realize the filtering of differential mode interference and common mode interference.
In the present invention, the rectifier circuit includes a KBP307 rectifier bridge.
In the invention, the switching circuit comprises a MOS tube SVF7N65F, a MOS tube driving chip OB2263MP, a customization transformer and a rectifier diode MBR10100FCT, the MOS tube driving chip OB2263MP controls the MOS tube SVF7N65F to switch at 65KHZ frequency and a certain duty ratio to work, the customization transformer converts 220V direct current into a 5V voltage platform, and the rectifier diode MBR10100FCT and a three-terminal controllable precise voltage-stabilizing source TL431A realize the output logic of the switching power supply.
In the invention, the feedback circuit is realized by adopting a photoelectric isolation chip, and is transmitted to the MOS tube driving chip OB2263MP through the photoelectric isolation chip EL817C so as to control the duty ratio of the MOS tube SVF7N65F and further stabilize the output voltage of the power supply.
In the invention, the LED driving circuit adopts an integrated LED array driving chip TM1650, and the integrated LED array driving chip TM1650 is connected with the CPU through an I2C bus.
In the invention, the reset circuit is realized by adopting a resistance-capacitance reset circuit.
In the present invention, the program downloading circuit and the communication circuit share one interface.
Has the advantages that: the invention can realize the driving of the LED array with 8 rows and 4 columns. Because the circuit is realized based on the switching power supply, the power consumption of the circuit is low, and meanwhile, the LED driving part of the circuit is realized by adopting the integrated LED driving chip, so that the stability of the LED driving circuit is effectively improved.
Drawings
Fig. 1 is a schematic circuit diagram of a power module according to a preferred embodiment of the invention.
Fig. 2 is a circuit connection diagram of an LED driving module according to a preferred embodiment of the invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.
An LED drive circuit comprises a power module circuit 1 and an LED drive module circuit 2, and the specific implementation of each part is as follows:
power supply module circuit 1
The power supply module circuit 1 supplies power to the LED drive module circuit 2, is realized by adopting a switch power supply, converts 220V alternating current into a voltage platform and rated current required by the LED drive circuit, comprises a 220VAC power supply 11, a filter circuit 12, a rectifying circuit 13, 220VDC14, a switch circuit 15, a 5V power supply 16 and a feedback circuit 17, and has the following working principle: the filter circuit 12 performs differential mode and common mode filtering on 220V alternating current input by the 220VAC power supply 11, the rectifying circuit 13 converts the 220V alternating current into 220VDC14, and the switch circuit 15 converts the 220VDC14 into a 5V power supply 16 required by the LED driving module circuit 2; the feedback circuit 17 collects the voltage output by the switching circuit 15, then transmits a voltage feedback signal 18 to the switching circuit 15, and adjusts the switching duty ratio of the switching circuit 15 to achieve the purpose of stabilizing the output voltage, as shown in fig. 1;
the filter circuit 12 is realized by adopting a 0.1uf/275VAC capacitor and a 3.3mH common mode magnetic ring inductor, the 0.1uf/275VAC capacitor is bridged between a zero line and a live line, and two windings of the 3.3mH common mode magnetic ring inductor are respectively connected in series on the zero line and the live line so as to realize the filtering of differential mode interference and common mode interference; the rectification circuit 13 is realized by a KBP307 rectifier bridge; the switching circuit 15 is realized by adopting an MOS tube SVF7N65F, an MOS tube driving chip OB2263MP, a custom transformer and a rectifier diode MBR10100FCT, the MOS tube driving chip OB2263MP controls the MOS tube SVF7N65F to switch at 65KHZ frequency and a certain duty ratio to work, the custom transformer converts 220V direct current into a 5V voltage platform, and the rectifier diode MBR10100FCT and a three-terminal controllable precise voltage stabilizing source TL431A realize the output logic of the switching power supply; the feedback circuit 17 is realized by adopting a photoelectric isolation chip EL817C, and the output voltage of a three-end controllable precise voltage-stabilizing source TL431A is collected and transmitted to a MOS tube driving chip OB2263MP through the photoelectric isolation chip EL817C to control the duty ratio of the MOS tube SVF7N65F so as to stabilize the output voltage of the power supply.
LED drive module circuit 2
The LED driving module circuit 2 drives 8 rows and 4 columns of LED arrays and comprises an LED driving circuit 21 and a CPU minimum system circuit, wherein the LED driving circuit 21 is realized by adopting an integrated LED array driving chip TM1650, and the integrated LED array driving chip TM1650 is connected with a CPU23 by adopting an I2C bus 22; the CPU minimum system circuit comprises a CPU23, a reset circuit 25, a program downloading circuit and a communication circuit 27, wherein the CPU23 is realized by R7F0C908, the reset circuit 25 is realized by a resistance-capacitance reset circuit, the low level reset is realized, the resistance is a 10K resistance, and the capacitance is a 0.1uf capacitance; the program downloading circuit is realized by adopting CPU special program downloading interfaces Tools0 and Reset; the communication circuit is realized by adopting a serial port; and the program downloading circuit and the communication circuit share one interface, as shown in fig. 2.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. An LED drive circuit comprises a power supply module circuit and an LED drive module circuit, and is characterized in that the power supply module circuit comprises a 220VAC power supply, a filter circuit, a rectifier circuit, a switch circuit and a feedback circuit, wherein the 220VAC power supply is connected with the filter circuit, the filter circuit is connected with the rectifier circuit, the rectifier circuit is connected with the switch circuit, and the switch circuit and the feedback circuit form closed-loop connection so as to achieve the purpose of stabilizing output voltage; the LED driving module circuit comprises an LED driving circuit and a CPU minimum system circuit, the CPU minimum system circuit comprises a CPU, a reset circuit, a program downloading circuit and a communication circuit, the LED driving circuit is connected with the CPU, and the CPU is respectively connected with the reset circuit, the program downloading circuit and the communication circuit.
2. The LED driving circuit according to claim 1, wherein the power module circuit operates according to the following principle: the filtering circuit carries out differential mode and common mode filtering on 220V alternating current input by a 220VAC power supply, the rectifying circuit converts the 220V alternating current into 220VDC, and the switching circuit converts the 220VDC into a 5V power supply required by the LED driving module circuit; the feedback circuit collects the voltage output by the switch circuit, then transmits a voltage feedback signal to the switch circuit, and adjusts the switch duty ratio of the switch circuit to stabilize the output voltage.
3. The LED driving circuit as claimed in claim 2, wherein the filter circuit comprises a 0.1uf/275VAC capacitor and a 3.3mH common mode magnetic loop inductor, the 0.1uf/275VAC capacitor is connected across the neutral line and the live line, and two windings of the 3.3mH common mode magnetic loop inductor are connected in series to the neutral line and the live line, respectively.
4. The LED driving circuit as claimed in claim 2, wherein in the 220V power supply module, the rectifying circuit comprises a KBP307 rectifying bridge.
5. The LED driving circuit of claim 2, wherein the switching circuit comprises a MOS transistor SVF7N65F, a MOS transistor driving chip OB2263MP, a custom transformer and a rectifier diode MBR10100 FCT.
6. The LED driving circuit of claim 2, wherein the feedback circuit comprises a photo-isolation chip.
7. The LED driving circuit according to claim 1, wherein the LED driving circuit adopts an integrated LED array driving chip TM1650, and the integrated LED array driving chip TM1650 is connected with the CPU through an I2C bus.
8. The LED driving circuit as claimed in claim 1, wherein the reset circuit is implemented as a resistor-capacitor reset circuit.
9. The LED driving circuit of claim 1, wherein the program downloading circuit and the communication circuit share an interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911223872.3A CN110996442A (en) | 2019-12-04 | 2019-12-04 | LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911223872.3A CN110996442A (en) | 2019-12-04 | 2019-12-04 | LED drive circuit |
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| Publication Number | Publication Date |
|---|---|
| CN110996442A true CN110996442A (en) | 2020-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911223872.3A Pending CN110996442A (en) | 2019-12-04 | 2019-12-04 | LED drive circuit |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103442504A (en) * | 2013-09-18 | 2013-12-11 | 湘潭大学 | LED (Light Emitting Diode) constant current driving circuit based on PWM (Pulse-Width Modulation) light-adjusting mode |
| CN204350367U (en) * | 2014-12-11 | 2015-05-20 | 深圳市固特亮照明有限公司 | Radio frequency light modulation LED power supply |
| CN106211468A (en) * | 2016-08-19 | 2016-12-07 | 盐城工学院 | A kind of LED drive circuit |
| CN208158951U (en) * | 2018-05-10 | 2018-11-27 | 福建大旭光电有限公司 | A kind of LED power circuit of tunable optical color-temperature regulating |
-
2019
- 2019-12-04 CN CN201911223872.3A patent/CN110996442A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103442504A (en) * | 2013-09-18 | 2013-12-11 | 湘潭大学 | LED (Light Emitting Diode) constant current driving circuit based on PWM (Pulse-Width Modulation) light-adjusting mode |
| CN204350367U (en) * | 2014-12-11 | 2015-05-20 | 深圳市固特亮照明有限公司 | Radio frequency light modulation LED power supply |
| CN106211468A (en) * | 2016-08-19 | 2016-12-07 | 盐城工学院 | A kind of LED drive circuit |
| CN208158951U (en) * | 2018-05-10 | 2018-11-27 | 福建大旭光电有限公司 | A kind of LED power circuit of tunable optical color-temperature regulating |
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Application publication date: 20200410 |
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| RJ01 | Rejection of invention patent application after publication |