CN210431984U

CN210431984U - High-efficiency constant-current digital light source controller

Info

Publication number: CN210431984U
Application number: CN201921392340.8U
Authority: CN
Inventors: 徐春青; 徐亮亮
Original assignee: Suzhou Weisenlaite Automation Technology Co Ltd
Current assignee: Suzhou Weisenlaite Automation Technology Co Ltd
Priority date: 2019-08-26
Filing date: 2019-08-26
Publication date: 2020-04-28
Anticipated expiration: 2029-08-26

Abstract

The utility model belongs to the technical field of the light source controller and specifically relates to efficient constant current digital light source controller. The light source controller comprises a single chip microcomputer, a multi-channel reference voltage system, a constant current circuit system and an OR gate circuit, wherein the single chip microcomputer is electrically connected with the multi-channel reference voltage system, the multi-channel reference voltage system is electrically connected with the constant current circuit system, the single chip microcomputer is electrically connected with the OR gate circuit, and the OR gate circuit is electrically connected with the constant current circuit system. The utility model discloses become the constant current circuit of can adjusting luminance of efficient DC-DC with original linear constant current part circuit. This circuit is designed around the LT3763 chip. The chip is provided with a dimming port and a stroboscopic port. This can be achieved by adding peripheral devices to the chip. The chip can complete the constant current function by matching with an MOS tube, an inductor, an oscillating circuit and a detection resistor. The conversion efficiency can reach more than 90%, and under the condition of full load of 6A, the heat generated by the MOS tube and the inductor does not exceed 60 ℃, and no extra radiator is needed.

Description

High-efficiency constant-current digital light source controller

Technical Field

The utility model belongs to the technical field of the light source controller and specifically relates to efficient constant current digital light source controller.

Background

The existing visual light source controller basically adopts linear constant current, utilizes a constant current circuit consisting of an MOS tube and an operational amplifier, and has the disadvantages of low conversion efficiency (only 50 percent), serious heat generation and large volume of the controller.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem described in the background art, the utility model provides an efficient constant current digital light source controller. The original linear constant current part circuit is changed into a high-efficiency DC-DC dimmable constant current circuit. This circuit is designed around the LT3763 chip. The chip is provided with a dimming port and a stroboscopic port. This can be achieved by adding peripheral devices to the chip. The chip can complete the constant current function by matching with an MOS tube, an inductor, an oscillating circuit and a detection resistor. The conversion efficiency can reach more than 90%, and under the condition of full load of 6A, the heat generated by the MOS tube and the inductor does not exceed 60 ℃, and no extra radiator is needed.

The utility model provides a technical scheme that its technical problem adopted is:

a high-efficiency constant-current digital light source controller comprises a single chip microcomputer, a multi-channel reference voltage system, a constant-current circuit system and an OR gate circuit, wherein the single chip microcomputer is electrically connected with the multi-channel reference voltage system, the multi-channel reference voltage system is electrically connected with the constant-current circuit system, the single chip microcomputer is electrically connected with the OR gate circuit, and the OR gate circuit is electrically connected with the constant-current circuit system.

Specifically, the single chip microcomputer is STC8A8K64S4A 12.

Specifically, the multichannel reference voltage system adopts four-channel DAC chip TLC 5620.

Specifically, the constant current circuit system is composed of a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a capacitor C1, a diode D1, a MOS Q1, an inductor L1 and a driving circuit U1, wherein one end of the resistor R1 is connected to a power supply, the other end of the resistor R1 is connected to one end of the resistor R1 and the 3 rd pin of the driving circuit U1, the other end of the resistor R1 is connected to ground, a first pin 10 of the driving circuit U1 is connected to the first pin of the resistor R1, a first pin of the driving circuit U1 is connected to the first pin of the driving circuit, a first pin of the driving circuit U1, a first pin of the, a 14 th pin of the driving circuit U1 is respectively connected to one end of a resistor R6 and one end of a resistor R7, the other end of the resistor R6 is connected to the DAC1, the other end of the resistor R7 is grounded, a 15 th pin of the driving circuit U1 is connected to one end of a capacitor C3, the other end of a capacitor C3 is grounded, a 27 th pin of the driving circuit U1 is respectively connected to one end of a capacitor C5 and the cathode of a diode D1, the other end of the capacitor C5 is respectively connected to the source of a MOS transistor Q1, the drain of the MOS transistor Q2 and one end of an inductor L1, the drain of the MOS transistor Q1 is respectively connected to one end of the capacitor C1 and the power supply, the other end of the capacitor C1 is grounded, the anode of the diode D1 is respectively connected to one end of the resistor R1 and one end of the capacitor C1, the other end of the capacitor C1 is respectively connected to the source and the ground of the resistor R1, the other end of the resistor R1 and, the other end of a parallel circuit composed of a resistor R15 and a resistor R16 is connected to one end of a resistor R14, one end of a resistor R17, one end of a capacitor C2 and the anode of the LED respectively, a capacitor C7 is connected in series between the other end of a resistor R13 and the other end of a resistor R14, the other end of a resistor R17 is connected to one end of a resistor R18, the other end of a resistor R18 is connected to the other end of a capacitor C2 and the ground respectively, the drain of a MOS transistor Q3 is connected to the cathode of the LED, the source of the MOS transistor Q3 is grounded, a resistor R9, a resistor R10 and a resistor R11 are grounded in parallel, one end of a capacitor C6 is connected to a resistor R686.

Specifically, the driving circuit U1 is LT 3763.

The utility model has the advantages that: the utility model provides an efficient constant current digital light source controller. The original linear constant current part circuit is changed into a high-efficiency DC-DC dimmable constant current circuit. This circuit is designed around the LT3763 chip. The chip is provided with a dimming port and a stroboscopic port. This can be achieved by adding peripheral devices to the chip. The chip can complete the constant current function by matching with an MOS tube, an inductor, an oscillating circuit and a detection resistor. The conversion efficiency can reach more than 90%, and under the condition of full load of 6A, the heat generated by the MOS tube and the inductor does not exceed 60 ℃, and no extra radiator is needed.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a frame diagram of the present invention;

fig. 2 is a circuit diagram of the single chip microcomputer of the present invention;

fig. 3 is a circuit diagram of a DAC chip of the multi-channel reference voltage system of the present invention;

FIG. 4 is a diagram of an OR gate circuit of the present invention;

fig. 5 is a circuit diagram of the constant current circuit system of the present invention;

in the figure, 1 is a singlechip, 2 is a multi-channel reference voltage system, 3 is a constant current circuit system, and 4 is an OR gate circuit.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.

Fig. 1 is the frame diagram of the present invention, fig. 2 is the circuit diagram of the single-chip microcomputer of the present invention, fig. 3 is the circuit diagram of the DAC chip of the multi-channel reference voltage system of the present invention, fig. 4 is the or gate circuit diagram of the present invention, and fig. 5 is the circuit diagram of the constant current circuit system of the present invention.

A high-efficiency constant-current digital light source controller comprises a single chip microcomputer 1, a multi-channel reference voltage system 2, a constant-current circuit system 3 and an OR gate circuit 4, wherein the single chip microcomputer 1 is electrically connected with the multi-channel reference voltage system 2, the multi-channel reference voltage system 2 is electrically connected with the constant-current circuit system 3, the single chip microcomputer 1 is electrically connected with the OR gate circuit 4, and the OR gate circuit 4 is electrically connected with the constant-current circuit system 3. The single chip microcomputer 1 is STC8A8K64S4A 12. The multichannel reference voltage system 2 adopts four-channel DAC chip TLC 5620. The constant current circuit system 3 is composed of a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a capacitor C1, a diode D1, a MOS tube Q1, an inductor L1 and a driving circuit U1, wherein one end of the resistor R1 is connected to a power supply, the other end of the resistor R1 is connected to one end of the resistor R1 and the 3 rd pin of the driving circuit U1, the other end of the resistor R1 is connected to ground, the first pin 10 of the driving circuit U1 is connected to the first pin of the resistor R1, the first pin 12, the first pin of the driving circuit U1, the first pin of the resistor R1 is connected to the ground, the first pin of the resistor R1, the first pin of the driving circuit U36, a 14 th pin of the driving circuit U1 is respectively connected to one end of a resistor R6 and one end of a resistor R7, the other end of the resistor R6 is connected to the DAC1, the other end of the resistor R7 is grounded, a 15 th pin of the driving circuit U1 is connected to one end of a capacitor C3, the other end of a capacitor C3 is grounded, a 27 th pin of the driving circuit U1 is respectively connected to one end of a capacitor C5 and the cathode of a diode D1, the other end of the capacitor C5 is respectively connected to the source of a MOS transistor Q1, the drain of the MOS transistor Q2 and one end of an inductor L1, the drain of the MOS transistor Q1 is respectively connected to one end of the capacitor C1 and the power supply, the other end of the capacitor C1 is grounded, the anode of the diode D1 is respectively connected to one end of the resistor R1 and one end of the capacitor C1, the other end of the capacitor C1 is respectively connected to the source and the ground of the resistor R1, the other end of the resistor R1 and, the other end of a parallel circuit composed of a resistor R15 and a resistor R16 is connected to one end of a resistor R14, one end of a resistor R17, one end of a capacitor C2 and the anode of the LED respectively, a capacitor C7 is connected in series between the other end of a resistor R13 and the other end of a resistor R14, the other end of a resistor R17 is connected to one end of a resistor R18, the other end of a resistor R18 is connected to the other end of a capacitor C2 and the ground respectively, the drain of a MOS transistor Q3 is connected to the cathode of the LED, the source of the MOS transistor Q3 is grounded, a resistor R9, a resistor R10 and a resistor R11 are grounded in parallel, one end of a capacitor C6 is connected to a resistor R686. The driving circuit U1 is LT 3763.

Referring to fig. 1, fig. 2, fig. 3, fig. 4, and fig. 5, when the switch is switched to be normally on, a high level is supplied to the single chip microcomputer 1, and when the IO port of the single chip microcomputer 1 receives the high level, a high level is supplied to the or gate circuit 4, so that the or gate always outputs "1", when the switch is switched to be in the strobe mode, a low level is supplied to the single chip microcomputer 1, and when the IO port of the single chip microcomputer 1 receives the low level, a low level is supplied to the or gate circuit 4, and at this time, the output of the or gate circuit 4 depends on an external trigger signal. The external trigger signal is 1, the output of the or gate is 1, the external trigger signal is 0, and the output of the or gate is 0.

The single chip microcomputer 1 is in SPI communication with a TLC5620 chip of the multichannel reference voltage system 2, and the single chip microcomputer 1 equally divides a 2.5V voltage into 255 levels. When the single chip microcomputer 1 sends 0x01 to the TLC5620 chip of the multichannel reference voltage system 2, the TLC5620 chip outputs a voltage approximately equal to 0.01V, the voltage is sent to a reference port of a driving circuit U1(LT3763) of the constant current circuit system 3, and the work LT3763 is used for reference feedback. By analogy, the single chip microcomputer 1 sends a numerical value between 0 and 255 to the TLC5620, and the TLC5620 outputs different reference voltage values to the LT 3763.

In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. A high-efficiency constant-current digital light source controller is characterized by comprising a single chip microcomputer (1), a multi-channel reference voltage system (2), a constant-current circuit system (3) and an OR gate circuit (4), wherein the single chip microcomputer (1) is electrically connected with the multi-channel reference voltage system (2), the multi-channel reference voltage system (2) is electrically connected with the constant-current circuit system (3), the single chip microcomputer (1) is electrically connected with the OR gate circuit (4), and the OR gate circuit (4) is electrically connected with the constant-current circuit system (3).

2. A high efficiency constant current digital light source controller as claimed in claim 1 wherein: the single chip microcomputer (1) is STC8A8K64S4A 12.

3. A high efficiency constant current digital light source controller as claimed in claim 1 wherein: the multichannel reference voltage system (2) adopts four-channel DAC chip TLC 5620.

4. A high efficiency constant current digital light source controller as claimed in claim 1 wherein: the constant current circuit system (3) is composed of a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a capacitor C1, a diode D1, a MOS tube Q1, an inductor L1 and a driving circuit U1, wherein one end of the resistor R1 is connected with a power supply, the other end of the resistor R1 is respectively connected with one end of the resistor R1 and the 3 rd pin of the driving circuit U1, the other end of the resistor R1 is respectively connected with the first pin 10 of the driving circuit U1, the first pin of the driving circuit U1 and the other end of the first pin of the resistor R1 are respectively connected with the first pin of the driving circuit U1, the driving circuit pin of the, a 14 th pin of the driving circuit U1 is respectively connected to one end of a resistor R6 and one end of a resistor R7, the other end of the resistor R6 is connected to the DAC1, the other end of the resistor R7 is grounded, a 15 th pin of the driving circuit U1 is connected to one end of a capacitor C3, the other end of a capacitor C3 is grounded, a 27 th pin of the driving circuit U1 is respectively connected to one end of a capacitor C5 and the cathode of a diode D1, the other end of the capacitor C5 is respectively connected to the source of a MOS transistor Q1, the drain of the MOS transistor Q2 and one end of an inductor L1, the drain of the MOS transistor Q1 is respectively connected to one end of the capacitor C1 and the power supply, the other end of the capacitor C1 is grounded, the anode of the diode D1 is respectively connected to one end of the resistor R1 and one end of the capacitor C1, the other end of the capacitor C1 is respectively connected to the source and the ground of the resistor R1, the other end of the resistor R1 and, the other end of a parallel circuit composed of a resistor R15 and a resistor R16 is connected to one end of a resistor R14, one end of a resistor R17, one end of a capacitor C2 and the anode of the LED respectively, a capacitor C7 is connected in series between the other end of a resistor R13 and the other end of a resistor R14, the other end of a resistor R17 is connected to one end of a resistor R18, the other end of a resistor R18 is connected to the other end of a capacitor C2 and the ground respectively, the drain of a MOS transistor Q3 is connected to the cathode of the LED, the source of the MOS transistor Q3 is grounded, a resistor R9, a resistor R10 and a resistor R11 are grounded in parallel, one end of a capacitor C6 is connected to a resistor R686.

5. The high efficiency constant current digital light source controller of claim 4, wherein: the driving circuit U1 is LT 3763.