CN103228083B - A kind of intelligent dimming LED drive power - Google Patents

Abstract

The present invention relates to an intelligent dimming LED driving power supply, which includes a preprocessing circuit, a subsequent DC/DC constant current driving circuit, a single-chip microcomputer control center, a photosensitive sensor, an infrared sensor and an LED lighting source; the input terminal of the preprocessing circuit is connected to the connected to an external power supply, the output terminal of the preprocessing circuit is connected to the input terminal of the subsequent DC/DC constant current drive circuit, and the output terminal of the subsequent DC/DC constant current drive circuit is connected to the LED lighting The power supply interface of the source is connected, the output end of the photosensitive sensor and the infrared sensor are connected with the input end of the single-chip microcomputer control center, and the output end of the single-chip microcomputer control center is respectively connected with the DC/DC constant current drive circuit of the rear stage The PWM control pin of the DC/DC constant current chip in the middle is connected with the power supply terminal of the AC/DC conversion circuit in the preprocessing circuit. By adopting the invention, the light intensity of the LED lighting source can be intelligently adjusted, and at the same time, the LED lighting source can be intelligently turned off or on.

Description

An intelligent dimming LED drive power supply

technical field

The invention belongs to the technical field of lighting and relates to an LED driving power supply, in particular to an intelligent dimming LED driving power supply.

Background technique

With the continuous development of society, people's requirements for home lighting are becoming more and more stringent. Indoor LED intelligent lighting system is a development trend. The existing LED dimming methods include wall-mounted dimming and infrared dimming. There is a certain lead wire between the type dimmer and the LED lighting tube, not only the wiring is complicated, the cost is high, and there is a certain amount of energy loss. Although infrared dimming avoids wiring problems, its dimming distance is limited and requires an external control board to manually send dimming signals, and the dimming accuracy is not high. Artificially adjusting the light intensity generally cannot achieve the best lighting state, so the existing dimming methods are neither convenient nor environmentally friendly.

Contents of the invention

The purpose of the present invention is to provide an intelligent dimming LED drive power supply capable of overcoming the defects of traditional LED intelligent lighting systems such as complex wiring and high cost.

In order to achieve the above object, the intelligent dimming LED drive power supply of the present invention includes a preprocessing circuit, a rear stage DC/DC constant current driving circuit, a single-chip microcomputer control center, a photosensitive sensor, an infrared sensor and an LED lighting source; the preprocessing The input end of the circuit is connected to an external power supply, the output end of the preprocessing circuit is connected to the input end of the subsequent DC/DC constant current drive circuit, and the output end of the subsequent DC/DC constant current drive circuit It is connected with the power interface of the LED lighting source, the output end of the photosensitive sensor and the infrared sensor is connected with the input end of the single-chip microcomputer control center, and the output end of the single-chip microcomputer control center is respectively connected with the rear stage DC/ The PWM control pin of the DC/DC constant current chip in the DC constant current drive circuit is connected to the power supply terminal of the AC/DC conversion circuit in the preprocessing circuit.

The preprocessing circuit includes an EMI filter circuit, a PFC control circuit and an AC/DC conversion circuit; the EMI filter circuit is connected to the input current of the external power supply, and the input current is filtered by the EMI filter circuit, and the PFC control circuit After the power factor is corrected and the AC/DC conversion circuit converts AC to DC, it is input to the input terminal of the subsequent DC/DC constant current drive circuit.

The output end of the AC/DC conversion circuit is also connected with an auxiliary power supply circuit, and the output end of the auxiliary power supply circuit is connected to the power supply of the single-chip microcomputer control center, the rear stage DC/DC constant current drive circuit, photosensitive sensor and infrared sensor respectively. The interface is connected.

The control end of the subsequent DC/DC constant current drive circuit is also connected with an over-temperature protection circuit and an over-current and over-voltage protection circuit.

The DC/DC constant current chip is BP2808 chip.

The AND processing circuit includes an NCP1607 chip for correcting the power factor of the input current and converting the input current into a direct current.

The single-chip microcomputer control center is provided with 80C51 single-chip microcomputer

The present invention has the following beneficial effects:

The intelligent dimming LED drive power supply of the present invention is equipped with a photosensitive sensor, a single-chip microcomputer control center and a rear-stage DC/DC constant current drive circuit, which can intelligently adjust the illumination brightness of the LED lighting source, and at the same time, through the infrared sensor Real-time judgment of whether there are people in the illumination range, and intelligently turn off or turn on the LED lighting source through the single-chip control center and the preprocessing circuit, the wiring is simple, the manufacturing cost is low, and the loss of electric energy can be greatly reduced at the same time.

Description of drawings

Fig. 1 is a functional block diagram of the intelligent dimming LED drive power supply;

Fig. 2 is the circuit schematic diagram of the preprocessing circuit 1 in the described intelligent dimming LED drive power supply;

FIG. 3 is a schematic circuit diagram of a downstream DC/DC constant current drive circuit 2 in the intelligent dimming LED drive power supply.

Among them: 1 is the preprocessing circuit, 2 is the post-stage DC/DC constant current drive circuit, 3 is the LED lighting source, 4 is the auxiliary power supply circuit, 5 is the single-chip control center, 6 is the infrared sensor, 7 is the photosensitive sensor, 8 is Overtemperature protection circuit, 9 are overcurrent and overvoltage protection circuits.

detailed description

The present invention is described in further detail below in conjunction with accompanying drawing:

Referring to Fig. 1, the intelligent dimming LED drive power supply of the present invention includes a preprocessing circuit 1, a subsequent DC/DC constant current drive circuit 2, a single-chip microcomputer control center 5, an auxiliary power supply circuit 4, a photosensitive sensor 7, and an LED lighting source 3 , the single-chip microcomputer control center 5 is provided with an 80C51 single-chip microcomputer, the preprocessing circuit 1 includes an EMI filter circuit, a PFC control circuit and an AC/DC conversion circuit, the input end of the EMI filter circuit is connected to an external power supply, and the The output end of the EMI filter circuit is connected with the input end of the PFC control circuit, the output end of the PFC control circuit is connected with the input end of the AC/DC conversion circuit, and the output end of the AC/DC conversion circuit It is connected with the input end of the DC/DC constant current drive circuit 2 of the rear stage and the input end of the auxiliary power supply circuit 4, the PFC control circuit corrects the power factor of the input current through the NCP1607 chip, and the AC/DC conversion The circuit converts the input current into a direct current through the NCP1607 chip, the output terminal of the subsequent DC/DC constant current drive circuit 2 is connected to the power interface of the LED lighting source 3, and the subsequent DC/DC constant current drive circuit 2 is connected to the power interface of the LED lighting source 3. The DC constant current drive circuit 2 is provided with a DC/DC constant current chip, and the DC/DC constant current chip is a BP2808 chip. The output terminals of the photosensitive sensor 7 and the infrared sensor 6 are connected with the input terminals of the single-chip microcomputer control center 5, and the output terminals of the single-chip microcomputer control center 5 are connected with the rear stage DC/DC constant current drive circuit 2 respectively. The PWM control pin of the BP2808 chip in the middle is connected with the Vcc pin of the NCP1607 chip in the AC/DC conversion circuit, and the output end of the auxiliary power supply circuit 4 is respectively connected with the control center 5 of the single-chip microcomputer, the photosensitive sensor 7, the infrared sensor 6 and the The power supply interface of the subsequent DC/DC constant current drive circuit 2 is connected. In addition, an over-temperature protection circuit 8 and an over-current and over-voltage protection circuit 9 are also connected to the control terminal of the subsequent DC/DC constant current drive circuit 2 .

Concrete operation of the present invention is as follows:

Through the intelligent dimming LED driving power supply of the present invention, the LED lighting source 3 can be automatically turned on or off, and the light intensity of the LED lighting source 3 can be intelligently adjusted, as follows:

With reference to Fig. 2, described external power supply input current is input in described preprocessing circuit 1 through the input terminal of EMI filter circuit, and described input current is filtered through described EMI filter circuit, PFC control circuit correction power factor, and AC/ The DC conversion circuit converts AC and DC to input to the subsequent DC/DC constant current drive circuit 2 . In addition, when the temperature of the subsequent DC/DC constant current drive circuit 2 is too high, the over-temperature protection circuit 8 can cut off the power supply of the subsequent DC/DC constant current drive circuit 2. When the voltage or current of the DC/DC constant current drive circuit 2 is too high, the overcurrent and overvoltage protection circuit 9 can cut off the power supply of the subsequent DC/DC constant current drive circuit 2 .

Referring to FIG. 3, the AC/DC conversion circuit converts the input current into a direct current, and inputs the converted input current to the input terminal of the subsequent DC/DC constant current drive circuit 2, and the subsequent DC/DC The DC constant current drive circuit 2 first converts the input current into a constant current, and receives the PWM wave output by the microcontroller control center 5 through the PWM control pin of the BP2808 chip in the subsequent DC/DC constant current drive circuit 2 , the BP2808 chip receives the PWM wave, and divides the constant current into multi-level constant current according to the PWM wave, wherein the current of each level is constant, and the constant current is The variation fluctuates less than 5%.

The infrared sensor 6 detects whether there is a user in the illumination range of the LED lighting source 3. When there is no user in the illumination range, the infrared sensor 6 generates a first change signal, and passes the first change signal through The D/A converter is input in the single-chip control center 5; when there is a user in the illumination range, the infrared sensor 6 generates a second change signal, and forwards the second change signal to the single-chip control center 5 in. The single-chip control center 5 receives the first change signal, and when the single-chip control center 5 does not receive the second change signal within the preset time, it can generate a low-level control signal, and at the same time The low-level control signal is forwarded to the Vcc pin of the NCP1607 chip in the AC/DC conversion circuit through the A/D converter, when the Vcc pin of the NCP1607 chip inputs the low-level control signal signal, the NCP1607 chip stops working, so that the subsequent DC/DC constant current drive circuit 2 stops working, and then the LED lighting source 3 is turned off. In addition, when the single-chip control center 5 receives the second change signal, and when the single-chip control center does not receive the first change signal within a preset time, it can generate a high-level control signal , and forward the high-level control signal to the Vcc pin of the NCP1607 chip in the AC/DC conversion circuit through the A/D converter, when the Vcc pin of the NCP1607 chip inputs a high-level control signal signal, the AC/DC conversion circuit works normally, so that the subsequent DC/DC constant current drive circuit 2 works normally, and the subsequent DC/DC constant current drive circuit 2 can drive the LED lighting source 3 works fine. In addition, when the single-chip microcomputer control center 5 receives the first change signal, and when the single-chip microcomputer control center 5 receives the second change signal within a preset time, the low power will not be generated. flat control signal; when the single-chip microcomputer control center 5 receives the second change signal, and when the single-chip control center 5 receives the first change signal within a preset time, it does not generate the The above-mentioned high-level control signal.

Simultaneously, the photosensitive sensor 7 collects the light intensity information of the external environment in real time, and transmits the light intensity information to the single-chip microcomputer control center 5 through the D/A converter, and the single-chip microcomputer control center 5 sends the light intensity information according to the light intensity. There are multiple levels of light intensity, and each light intensity level corresponds to a PWM wave. The single-chip microcomputer control center 5 receives the light intensity information, obtains the current light intensity level according to the light intensity information, and generates a signal corresponding to the current light intensity. The PWM wave corresponding to the intensity level, and finally forward the PWM wave to the PWM control pin of the BP2808 chip in the DC/DC constant current drive circuit 2 of the subsequent stage through the A/D converter, and the DC/DC constant current of the latter stage The driving circuit 2 generates a current corresponding to the level of the PWM wave according to the PWM wave, and inputs the current into the LED lighting source 3, and the LED lighting source 3 can display the light intensity of the current external environment corresponding light intensity.

Claims (2)

1. an intelligent dimming LED drive power, it is characterized in that, comprise pre-process circuit (1), rear class DC/DC constant-current drive circuit (2), Single-chip Controlling center (5), light sensor (7), infrared sensor (6) and LED illumination source (3);

The input of described pre-process circuit (1) is connected with external power supply, the output of described pre-process circuit (1) is connected with the input of described rear class DC/DC constant-current drive circuit (2), the output of described rear class DC/DC constant-current drive circuit (2) is connected with the power interface of described LED illumination source (3), the output of described light sensor (7) and infrared sensor (6) is connected with the input of described Single-chip Controlling center (5), the output of described Single-chip Controlling center (5) is connected with the PWM control pin of DC/DC constant current chip in described rear class DC/DC constant-current drive circuit (2) and the power end of the middle AC/DC conversion circuit of described pre-process circuit (1) respectively,

The control end of described rear class DC/DC constant-current drive circuit (2) is also connected with thermal-shutdown circuit (8) and overcurrent-overvoltage protecting circuit (9); Described pre-process circuit (1) comprises EMI filter circuit, PFC control circuit and AC/DC conversion circuit; Described EMI filter circuit accesses the input current of described external power supply, and described input current is input in the input of described rear class DC/DC constant-current drive circuit (2) after described EMI filter circuit filtering, PFC control circuit correcting power factors and AC/DC conversion circuit AC-DC conversion; 80C51 single-chip microcomputer is provided with in described Single-chip Controlling center (5);

Input current is input in described pre-process circuit (1) by the input of EMI filter circuit by described external power supply, and described input current is input in described rear class DC/DC constant-current drive circuit (2) after described EMI filter circuit filtering, PFC control circuit correcting power factors and AC/DC conversion circuit AC-DC conversion; In addition, when described rear class DC/DC constant-current drive circuit (2) temperature is too high, described thermal-shutdown circuit (8) can cut off the power supply of described rear class DC/DC constant-current drive circuit (2), when the overtension of described rear class DC/DC constant-current drive circuit (2) or electric current too high time, described overcurrent-overvoltage protecting circuit (9) can cut off the power supply of described rear class DC/DC constant-current drive circuit (2); The output of described AC/DC conversion circuit is also connected with auxiliary power supply circuit (4), and the output of described auxiliary power supply circuit (4) is connected with the power interface of described Single-chip Controlling center (5), rear class DC/DC constant-current drive circuit (2), light sensor (7) and infrared sensor (6) respectively; Described pre-process circuit (1) comprises the power factor for correcting described input current and described input current is converted to the NCP1607 chip of direct current.

2. intelligent dimming LED drive power according to claim 1, is characterized in that, described DC/DC constant current chip is BP2808 chip.