CN111586929A

CN111586929A - Infrared light filling lamp circuit of VCSEL without red explosion

Info

Publication number: CN111586929A
Application number: CN202010469030.2A
Authority: CN
Inventors: 杜德建; 陈鹏; 林辉; 高峰
Original assignee: Chengdu Aerospace Kate Mechanical And Electrical Technology Co ltd
Current assignee: Chengdu Aerospace Kate Mechanical And Electrical Technology Co ltd
Priority date: 2020-05-28
Filing date: 2020-05-28
Publication date: 2020-08-25

Abstract

The invention discloses a red-explosion-free VCSEL infrared light supplement lamp circuit which comprises a power supply circuit, an enabling and protecting circuit, a VCSEL driving circuit and an infrared VCSEL; the power supply circuit comprises a power supply and a voltage stabilizing circuit, the power supply circuit is connected with the enabling and protecting circuit through the voltage stabilizing circuit, the enabling and protecting circuit is connected with the output end of the VCSEL driving circuit and used for detecting output signals of the VCSEL driving circuit, and the output end of the VCSEL driving circuit is connected with the infrared VCSEL. According to the invention, the 940nm infrared VCSEL is used for solving the red explosion phenomenon, the VCSEL driving circuit is used for driving a plurality of infrared VCSEL lamp beads, the power of a single infrared VCSEL is reduced, the heating of the infrared VCSEL is reduced, the service life of the monitoring camera is prolonged, and the high-end current detection chip is used for detecting the output current of the VCSEL driving circuit, so that the circuit fault self-detection is realized.

Description

Infrared light filling lamp circuit of VCSEL without red explosion

Technical Field

The invention relates to the technical field of infrared light supplement circuits, in particular to a VCSEL infrared light supplement lamp circuit without red explosion.

Background

The optical imaging sensor that the surveillance camera machine formation of image relied on mainly is the external light of response and changes the signal of telecommunication, generally sees the object through drawing big exposure time, amplification gain value under the light condition dark even does not have, but the image noise point at this time is very big, can not satisfy the requirement of security protection control, needs to pass through infrared light filling reinforcing external light, and the light filling system of infrared camera machine still has following two problems in practical application at present: (1) the red explosion phenomenon generally exists in ordinary infrared light filling lamp, and once infrared light filling lamp is opened, there is the red explosion phenomenon, is unfavorable for hiding, influences visual effect. (2) When monitoring closely object can produce the image center phenomenon of overexposing because infrared lamp luminance is too strong, luminous angle is too concentrated, when the circuit appears unusually, can't realize the trouble self-checking.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a Vertical-Cavity Surface-Emitting Laser (VCSEL) infrared light supplement lamp circuit without red explosion.

The technical scheme adopted by the invention is as follows:

a VCSEL infrared light supplement lamp circuit without red explosion comprises a power circuit, an enabling and protecting circuit, a VCSEL driving circuit and an infrared VCSEL; the power supply circuit comprises a power supply and a voltage stabilizing circuit, the power supply circuit is connected with the enabling and protecting circuit through the voltage stabilizing circuit, the enabling and protecting circuit is connected with the output end of the VCSEL driving circuit and used for detecting output signals of the VCSEL driving circuit, and the output end of the VCSEL driving circuit is connected with the infrared VCSEL.

Preferably, the voltage stabilizing circuit comprises a three-terminal voltage stabilizing chip LM78L 05.

Preferably, the enabling and protecting circuit comprises an LM2903 comparator and a ZXCT1008 current detection chip.

Preferably, the VCSEL driving circuit includes a PAM2861 driving chip.

Preferably, the wavelength of the infrared VCSEL is 940 nm.

Preferably, the number of the infrared VCSELs is 4, and the infrared VCSELs are connected in series.

The invention has the beneficial effects that: the infrared VCSEL with the wavelength of 940nm is used for solving the red explosion phenomenon, the VCSEL driving circuit is used for driving a plurality of infrared VCSEL lamp beads, the power of a single infrared VCSEL is reduced, the heating of the infrared VCSEL is reduced, the service life of the monitoring camera is prolonged, the high-end current detection chip is used for detecting the output current of the VCSEL driving circuit, and the circuit fault self-detection is realized.

Drawings

FIG. 1 is a schematic circuit diagram according to an embodiment of the present invention;

reference numerals: 1. power supply circuit, 2, enable and protection circuit, 3, VCSEL drive circuit.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Examples

As shown in fig. 1, an infrared light supplement lamp circuit of a VCSEL without red explosion includes a power circuit 1, an enabling and protecting circuit 2, a VCSEL driving circuit 3, and an infrared VCSEL; the power supply circuit 1 comprises a power supply and a voltage stabilizing circuit, the power supply circuit 1 is connected with the enabling and protecting circuit 2 through the voltage stabilizing circuit, the enabling and protecting circuit 2 is connected with the output end of the VCSEL driving circuit 3 and used for detecting the output signal of the VCSEL driving circuit 3, and the output end of the VCSEL driving circuit 3 is connected with the infrared VCSEL.

In one embodiment, as shown in fig. 1, the voltage regulator circuit includes an LM78L05 three-terminal regulator chip U1, a capacitor C1, and a capacitor C2, and the specific connection relationship is as shown in the power circuit 1 portion in fig. 1, and the voltage regulator circuit converts a 12V power supply into a 5V power supply and provides the 5V power supply to other portions of the fill light circuit.

In one embodiment, as shown in fig. 1, the enabling and protecting circuit 2 includes a ZXCT1008 current detecting chip U2, an LM2903 comparator U3, 10 resistors R1-R10, and a capacitor C3, and the specific connection relationship is as shown in the portion of the enabling and protecting circuit 2 in fig. 1, where the resistor R1 is a sampling resistor, and when the current reaches a certain value, the comparator turns off the VCSEL driving circuit 3.

In one embodiment, as shown in fig. 1, the VCSEL driving circuit 3 includes a PAM2861 driving chip U4, sampling resistors R11 and R12, a diode D1, capacitors C4-C7, and an inductor L1, and the specific connection relationship is shown in the VCSEL driving circuit 3 portion in fig. 1. The anode and the cathode of the infrared VCSEL are respectively connected with the LED + and the LED-node.

In one embodiment, the infrared VCSEL has a wavelength of 940 nm.

In one embodiment, as shown in fig. 1, the number of the infrared VCSELs is 4, and the infrared VCSELs are connected in series.

According to the invention, the VCSEL drive circuit 3 is used for driving the plurality of infrared VCSELs, the power of a single infrared VCSEL is reduced, the heating of the single infrared VCSEL is reduced, the service life of the monitoring camera is prolonged, the high-end current detection chip is used for detecting the input current of the VCSEL drive circuit 3, the circuit fault self-checking is realized, and the 940nm infrared VCSEL lamp bead is selected for solving the red explosion phenomenon.

The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.

Claims

1. The infrared light supplement lamp circuit of the VCSEL without the red explosion is characterized by comprising a power supply circuit (1), an enabling and protecting circuit (2), a VCSEL driving circuit (3) and an infrared VCSEL; the power supply circuit (1) comprises a power supply and a voltage stabilizing circuit, the power supply circuit (1) is connected with the enabling and protecting circuit (2) through the voltage stabilizing circuit, the enabling and protecting circuit (2) is connected with the output end of the VCSEL driving circuit (3) and used for detecting output signals of the VCSEL driving circuit (3), and the output end of the VCSEL driving circuit (3) is connected with the infrared VCSEL.

2. The infrared fill light circuit of no red explosion VCSEL of claim 1, wherein the voltage stabilizing circuit comprises a three-terminal voltage stabilizing chip LM78L 05.

3. The VCSEL infrared fill light circuit without red explosion according to claim 1, wherein the enabling and protecting circuit (2) comprises an LM2903 comparator and a ZXCT1008 current detection chip.

4. The VCSEL infrared fill light circuit without red explosion according to claim 1, wherein the VCSEL driving circuit (3) comprises a PAM2861 driving chip.

5. The infrared fill light circuit of claim 1, wherein the infrared VCSEL has a wavelength of 940 nm.

6. The infrared fill-in lamp circuit of a non-red-explosion VCSEL according to claim 5, wherein the number of the infrared VCSELs is 4, and the infrared VCSELs are connected in series.