CN218071858U

CN218071858U - Light source controller with short-circuit protection

Info

Publication number: CN218071858U
Application number: CN202220957899.6U
Authority: CN
Inventors: 王勇; 梁光; 邓通华; 李永明; 蒙焕诗; 邹梅英; 蒋周天
Original assignee: Shenzhen Danbes New Energy Technology Co ltd
Current assignee: Shenzhen Danbes New Energy Technology Co ltd
Priority date: 2022-04-24
Filing date: 2022-04-24
Publication date: 2022-12-16
Anticipated expiration: 2032-04-24

Abstract

The utility model discloses a light source controller with short-circuit protection, which comprises an MCU control circuit for controlling the normal work of the light source controller, a DC/DC switching power supply circuit for performing voltage stabilization conversion on a power supply voltage, an optical coupler isolation circuit for performing signal isolation, an RS232 communication circuit for performing remote communication control with the outside, a light source driving output circuit for driving a light source, and a short-circuit protection circuit for performing short-circuit protection; the short-circuit protection circuit comprises a low-internal-resistance high-current MOS tube Q5 and an MOS tube Q1 which are used for supplying power to the light source driving output circuit, a sampling resistor used for collecting output current, and a comparator U6 used for comparing sampled feedback voltage signals. The utility model discloses technical scheme solves the light source controller parameter adjustment problem, improves its interference immunity and reliability, improves the use experience and the life of product.

Description

Light source controller with short-circuit protection

Technical Field

The utility model relates to a controller technical field, in particular to take short-circuit protection's light source controller.

Background

The light source controller is a controller specially designed for driving an LED light source, provides stable brightness for equipment or a camera, keeps the brightness of an image consistent, and provides a guarantee basis for image recognition, and the current light source controller has a single function, is inconvenient to use and has low reliability and stability, and is represented in the following aspects: 1: the mechanical knob adjusts control parameters, the selection and size adjustment of each parameter are complicated, the adjustment time is long, misoperation is easy, and the use is inconvenient; 2: the trigger signal isolation function is not provided, so that internal signal interference and voltage impact are easily caused and the internal signal interference and the voltage impact are easily damaged; 3: the output interface is unprotected, and if the output interface is short-circuited in an unexpected situation, permanent damage to the controller device can be caused, and unnecessary loss is caused.

Accordingly, the prior art is deficient and needs improvement.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a take short-circuit protection's light source controller aims at solving the light source controller parameter adjustment problem, improves its interference immunity and reliability, improves the use experience and the life of product.

In order to achieve the above object, the utility model provides a light source controller with short-circuit protection, including the MCU control circuit that is used for controlling the normal work of light source controller, the DC \ DC switching power supply circuit that is used for carrying out steady voltage conversion to supply voltage, the opto-coupler isolation circuit that is used for carrying out signal isolation, the RS232 communication circuit that is used for carrying out remote communication control with the outside, the light source drive output circuit that is used for driving the light source, the short-circuit protection circuit that is used for carrying out short-circuit protection; the short-circuit protection circuit comprises a low-internal-resistance high-current MOS tube Q5 and an MOS tube Q1 which are used for supplying power to the light source driving output circuit, a sampling resistor used for collecting output current, and a comparator U6 used for comparing sampled feedback voltage signals.

Preferably, the MCU control circuit comprises a 32-bit MCU, and the model of the MCU is set to be GD32F130C8T6.

Preferably, the DC \ DC switching power supply circuit comprises a voltage reduction chip of model RY8310, and the voltage range of the input end of the voltage reduction chip is 10-24V.

Preferably, the optical coupler isolation circuit comprises an optical coupler, an input end of the optical coupler is connected with a current limiting resistor and a filter capacitor, and an output end of the optical coupler is connected with a pull-up resistor.

Preferably, the RS232 communication circuit includes an RS232 communication chip for converting the level into the TTL level.

Preferably, the light source driving output circuit comprises a low internal resistance MOS transistor Q6, and a driving end of the MOS transistor Q6 is connected to a driving chip of model EG 27324.

Compared with the prior art, the beneficial effects of the utility model are that: through opto-isolator, MCU detection and control circuit, can solve the signal in the industry and easily disturb, the parameter adjustment is loaded down with trivial details, output short circuit damages scheduling problem. After the short-circuit protection function circuit is added, once the output end is short-circuited or has overlarge current, the controller can respond at the first time, the power supply of the output end is closed, and the controller is prevented from being further damaged.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic block diagram of a light source controller according to the present invention;

FIG. 2 is a schematic diagram of the MCU control circuit of the present invention;

FIG. 3 is a schematic diagram of the DC \ DC switching power supply circuit of the present invention;

FIG. 4 is a schematic diagram of the optical coupling isolation circuit of the present invention;

fig. 5 is a schematic circuit diagram of the RS232 communication circuit of the present invention;

fig. 6 is a schematic diagram of the light source driving output circuit of the present invention;

FIG. 7 is a schematic diagram of the short-circuit protection circuit of the present invention;

the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

Referring to fig. 1, a light source controller with short-circuit protection according to this embodiment includes an MCU control circuit for controlling normal operation of the light source controller, a DC \ DC switching power supply circuit for performing voltage stabilization conversion on a power supply voltage, an optocoupler isolation circuit for performing signal isolation, an RS232 communication circuit for performing remote communication control with the outside, a light source driving output circuit for driving a light source, and a short-circuit protection circuit for performing short-circuit protection;

referring to fig. 7, the short-circuit protection circuit includes a low internal resistance high current MOS transistor Q5 and a MOS transistor Q1 for supplying power to the light source driving output circuit, a sampling resistor for collecting output current, and a comparator U6 for comparing sampled feedback voltage signals. It should be noted that the short-circuit protection circuit collects the current of the output end through the sampling resistor to form a feedback signal, and the short-circuit and overcurrent conditions are protected by adopting a hardware signal detection mode, so that the response speed and the functional stability are improved. Specifically, a MOS tube with low internal resistance and large current is adopted to supply power for the light source driving output circuit. The current output by sampling the resistor is sampled, the sampled feedback voltage signal is compared with the in-phase signal of the comparator, if short circuit occurs, the feedback signal is higher than the in-phase end, the comparator outputs a low level signal to close the MOS tube Q5, meanwhile, the MOS tube Q1 is also closed, the power supply of the light source driving output circuit is closed, the MOS tube at the driving end is prevented from being damaged, a signal is provided for the MUC, and an alarm signal is sent out.

Further, referring to fig. 2, the MCU control circuit includes a 32-bit MCU with a model of GD32F130C8T6. The high-performance MCU is adopted, the operation and response speed is high, the control signal and the short circuit alarm signal can be responded rapidly, and in the embodiment, the detection, judgment, operation and control of the normal work of a peripheral circuit are realized by burning software in a chip.

Further, referring to fig. 3, the DC \ DC switching power supply circuit includes a voltage reduction chip of model RY8310, and the voltage range of the input end of the voltage reduction chip is 10-24V, so that the power supply conversion efficiency is high, and the power supply circuit has small heat productivity, and is stable and reliable.

Further, referring to fig. 4, the optical coupler isolation circuit includes an optical coupler, an input end of the optical coupler is connected to a current limiting resistor and a filter capacitor, and an output end of the optical coupler is connected to a pull-up resistor. Adopt opto-coupler to keep apart not only can keep apart the signal, can compatible different voltage signal moreover, increased the range of application. Specifically, the input end can limit the input current through the current-limiting resistor, and the optical coupler can adapt to 5-24V input signals within the working current range of the optical coupler. The filter capacitor is added at the input end, so that the interference signal can be effectively filtered. The optical coupling isolation output end is added with a pull-up resistor to provide a stable signal for the MCU.

Further, referring to fig. 5, the RS232 communication circuit includes an RS232 communication chip for converting the level into a TTL level, so as to implement remote control and remote parameter setting modification, thereby avoiding manual key or knob operation.

Further, referring to fig. 6, the light source driving output circuit includes a low internal resistance MOS transistor Q6, and a driving end of the MOS transistor Q6 is connected to a driving chip of model EG 27324. It should be noted that the circuit adopts the MOS transistor and the PWM control method to adjust the brightness of the light source, and this method can not only achieve high resolution adjustment of the light source, but also avoid the heat of the MOS transistor, so that the service life is longer and more reliable. Specifically, the MOS tube Q6 with low internal resistance is adopted, so that the heat productivity of work can be reduced, and the stability of the circuit is ensured. The light source is driven in a PWM mode, so that the purpose of adjusting the average current of the light source is achieved, meanwhile, the MOS tube Q6 is prevented from being in an unsaturated state, and the heat productivity of the MOS tube Q6 is reduced. The driving end of the MOS transistor Q6 adopts a special driving chip, so that the rising and falling time of the grid signal level of the MOS transistor Q6 is ensured to be short enough, and the heating of the MOS transistor Q6 is further reduced.

The above is only the preferred embodiment of the present invention, and not the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings or the direct or indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A light source controller with short-circuit protection is characterized by comprising an MCU control circuit, a DC/DC switching power supply circuit, an optical coupler isolation circuit, an RS232 communication circuit, a light source driving output circuit and a short-circuit protection circuit, wherein the MCU control circuit is used for controlling the normal work of the light source controller; the short-circuit protection circuit comprises a low-internal-resistance high-current MOS tube Q5 and an MOS tube Q1 which are used for supplying power to the light source driving output circuit, a sampling resistor used for collecting output current, and a comparator U6 used for comparing sampled feedback voltage signals.

2. The light source controller with short-circuit protection as claimed in claim 1, wherein the MCU control circuit comprises a 32-bit MCU, and the model of the MCU is set to GD32F130C8T6.

3. The light source controller with short-circuit protection as claimed in claim 1, wherein the DC \ DC switching power supply circuit includes a type RY8310 voltage reduction chip, and the voltage range of the input end of the voltage reduction chip is 10-24V.

4. The light source controller with short-circuit protection as claimed in claim 1, wherein the optical coupler isolation circuit comprises an optical coupler, an input end of the optical coupler is connected with a current-limiting resistor and a filter capacitor, and an output end of the optical coupler is connected with a pull-up resistor.

5. The light source controller with short-circuit protection as claimed in claim 1, wherein said RS232 communication circuit includes an RS232 communication chip for converting a level into a TTL level.

6. The light source controller with short-circuit protection as claimed in claim 1, wherein the light source driving output circuit includes a MOS transistor Q6 with low internal resistance, and a driving end of the MOS transistor Q6 is connected to a driving chip of model EG 27324.