CN210579369U

CN210579369U - LED driving chip of flashlight

Info

Publication number: CN210579369U
Application number: CN201921084759.7U
Authority: CN
Inventors: 张记刚
Original assignee: Ningbo Yongen Electronic Technology Co ltd
Current assignee: Ningbo Yongen Electronic Technology Co ltd
Priority date: 2019-07-11
Filing date: 2019-07-11
Publication date: 2020-05-19
Anticipated expiration: 2029-07-11

Abstract

The utility model relates to a LED drive chip of flashlight, including the switch control circuit, output circuit, the current sampling circuit who is used for sending switching signal and is used for gathering switching signal and converting into the signal of telecommunication and the PWM pulse circuit who is used for receiving the signal of telecommunication and changes output frequency and voltage, switch control circuit one end is connected with the input of current sampling circuit and the first input electricity of output circuit respectively, and the switch control circuit other end is connected with output circuit's output, current sampling circuit's output is connected with PWM pulse circuit, and the output of PWM pulse circuit is connected with output circuit's second input, through merging into one the circuit that is used for controlling LED bulb switch and the circuit that is used for controlling LED bright and dark bulb and scintillation frequency, has left out unnecessary electronic components, has realized corresponding function promptly, the requirements of users are met, and the production cost of the LED chip of the flashlight is reduced.

Description

LED driving chip of flashlight

Technical Field

The utility model relates to a chip technical field especially relates to a LED driver chip of flashlight.

Background

At present, more and more manufacturers adopt LED bulbs as bulbs of the flashlight, the LED bulbs have longer endurance and stronger brightness compared with the original electric bulbs, the reliability is better due to the structure of the LED, and most of LED flashlights only have the opening and closing functions due to the overhigh production cost of the LED driving chip, so that the requirements of users cannot be met.

SUMMERY OF THE UTILITY MODEL

To the current situation of above-mentioned prior art, the utility model aims to solve the technical problem that a LED driver chip of flashlight is provided to solve prior art problem.

The utility model provides a technical scheme that above-mentioned technical problem adopted does:

the utility model provides a LED driver chip of flashlight, is including the switch control circuit, output circuit, the current sampling circuit who is used for gathering the switching signal and converts into the signal of telecommunication and the PWM pulse circuit who is used for receiving the signal of telecommunication and changes output frequency and voltage that are used for sending switching signal, switch control circuit one end is connected with current sampling circuit's input and output circuit's first input electricity respectively, and this switch control circuit other end is connected with output circuit's output, current sampling circuit's output is connected with PWM pulse circuit, and this PWM pulse circuit's output is connected with output circuit's second input.

Preferably, the switch control circuit comprises a switch, a power supply and a capacitor, the switch is arranged between the power supply and the capacitor, one end of the switch is connected with one end of the power supply, the other end of the switch is connected with one end of the capacitor, the other end of the power supply is connected with the other end of the capacitor, and the capacitor can be switched between a charging state and a discharging state and send out a capacitor current signal through the on-off of the switch, so that the switch not only has the function of switching electricity, but also has the function of switching a flashlight mode, unnecessary electronic elements are reduced, and the production cost of the driving chip is reduced.

Preferably, the current sampling circuit comprises a sampling pulse type trigger and a trigger, the input end of the sampling pulse type trigger is connected with the capacitor, the output end of the sampling pulse type trigger is connected with the input end of the trigger, the sampling pulse type trigger can receive a capacitor current signal and send out a corresponding sampling signal, and the trigger can send out a corresponding command signal after receiving the corresponding sampling signal.

Preferably, the PWM pulse circuit includes a comparator and a continuous pulse generator, a first input terminal of the comparator is connected to the power supply, a second input terminal of the comparator is connected to an output terminal of the trigger, an output terminal of the comparator is connected to an input terminal of the continuous pulse generator, the comparator can receive the command signal and compare the current output by the power supply with the current output by the continuous pulse generator, and the continuous pulse generator receives the signal sent by the comparator and changes the frequency of the output power supply according to the PWM principle.

Preferably, the output circuit comprises an MOS tube, a resistor and an LED bulb, wherein a G pole of the MOS tube is connected to an output end of the continuous generator, an S pole of the MOS tube is connected to an input end of the resistor, a D pole of the MOS tube is connected to a power supply, an output end of the resistor is connected to an input end of the LED bulb, an output end of the LED bulb is connected to the power supply, and the G pole of the MOS tube can be connected to or disconnected from the S pole of the MOS tube and the D pole of the MOS tube according to a power frequency generated by the continuous pulse generator, so that a voltage and a frequency in the output circuit are changed, and a brightness and a flicker frequency of the LED bulb are controlled.

Compared with the prior art, the utility model has the advantages of:

through merging into one the circuit that is used for controlling the circuit of LED bulb switch and is used for controlling LED bulb light and shade and flicker frequency, saved unnecessary electronic components, realized corresponding function promptly, satisfied user's demand, reduced the manufacturing cost of flashlight LED chip again, and owing to merged circuit has left out partly electronic components, saved corresponding PCB space promptly, saved the cost of whole system again, further reduced the cost of making multifunctional electric torch, the utility model relates to a rationally, accord with the market demand, be fit for promoting.

Drawings

FIG. 1 is a block diagram of the present invention;

fig. 2 is a schematic diagram of the present invention.

Detailed Description

As shown in fig. 1-2, the power supply comprises a switch control circuit for sending a switch signal, an output circuit, a current sampling circuit for collecting the switch signal and converting the switch signal into an electric signal, and a PWM pulse circuit for receiving the electric signal and changing the output frequency and voltage, wherein one end of the switch control circuit is electrically connected to an input end of the current sampling circuit and a first input end of the output circuit, the other end of the switch control circuit is connected to an output end of the output circuit, an output end of the current sampling circuit is connected to the PWM pulse circuit, and an output end of the PWM pulse circuit is connected to a second input end of the output circuit.

When the flashlight is operated, the switch is turned on, the LED bulb is powered on, the switch is turned off, the LED bulb is turned off, the function of the flashlight is switched once every time the switch is switched on and off, the function is divided into three functions of full lighting of the LED bulb, 25% brightness emitted by the LED bulb and explosion flashing, the three functions are sequentially switched in a circulating way, the capacitor can be charged when a circuit is switched on, a capacitor current signal is generated by discharging when the circuit is switched off, a sampling pulse type trigger sends a corresponding sampling signal after receiving the capacitor current signal, the trigger can send a corresponding command signal after receiving the corresponding sampling signal, the comparator can receive the command signal and compare the current output by the power supply with the current output by the continuous pulse generator, the continuous pulse generator receives the signal sent by the comparator and changes the frequency of the output power supply through a PWM principle, the G pole of the MOS tube is powered on, the S pole of the MOS tube is communicated with the D, the G pole of the MOS tube cannot be electrified, the S pole of the MOS tube is disconnected with the D pole of the MOS tube, the continuous pulse generator can control the G pole of the MOS tube to be electrified or powered off, so that the connection frequency of the S pole of the MOS tube and the D pole of the MOS tube is controlled to be switched on or off, the higher the connection frequency of the S pole of the MOS tube and the D pole of the MOS tube is, the higher the voltage in an output circuit is, the brighter the LED bulb is, conversely, the connection frequency of the S pole of the MOS tube and the D pole of the MOS tube is lower, the lower the voltage in the output circuit is, the darker the LED bulb is, the connection frequency of the S pole of the MOS tube and the D pole of the MOS tube is low to a certain degree, the LED bulb can perform the explosion and flash function, and by combining a circuit for controlling the switch of the LED bulb and a circuit for controlling the brightness and flash frequency of the LED bulb into a whole, unnecessary electronic components are omitted, so that the corresponding function is realized, the requirement of a user is, and because the merging circuit omits a part of electronic components, the corresponding PCB space is saved, the cost of the whole system is saved, and the cost for manufacturing the multifunctional flashlight is further reduced.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that various changes in the embodiments and modifications thereof may be made, and equivalents may be substituted for elements thereof; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. The LED driving chip of the flashlight is characterized by comprising a switch control circuit, an output circuit, a current sampling circuit and a PWM pulse circuit, wherein the switch control circuit is used for sending a switch signal, the current sampling circuit is used for collecting the switch signal and converting the switch signal into an electric signal, the PWM pulse circuit is used for receiving the electric signal and changing output frequency and voltage, one end of the switch control circuit is electrically connected with the input end of the current sampling circuit and the first input end of the output circuit respectively, the other end of the switch control circuit is connected with the output end of the output circuit, the output end of the current sampling circuit is connected with the PWM pulse circuit, and the output end of the PWM pulse circuit is connected with the second input end of the output circuit.

2. The LED driving chip of claim 1, wherein the switch control circuit comprises a switch, a power supply and a capacitor, the switch is disposed between the power supply and the capacitor, one end of the switch is connected to one end of the power supply, the other end of the switch is connected to one end of the capacitor, and the other end of the power supply is connected to the other end of the capacitor.

3. The LED driving chip of the flashlight of claim 2, wherein the current sampling circuit comprises a sampling pulse type trigger and a trigger, wherein an input end of the sampling pulse type trigger is connected with the capacitor, and an output end of the sampling pulse type trigger is connected with an input end of the trigger.

4. The LED driving chip of claim 3, wherein the PWM pulse circuit comprises a comparator and a continuous pulse generator, a first input terminal of the comparator is connected to the power supply, a second input terminal of the comparator is connected to the output terminal of the trigger, and an output terminal of the comparator is connected to the input terminal of the continuous pulse generator.

5. The LED driving chip of claim 4, wherein the output circuit comprises a MOS transistor, a resistor and an LED bulb, the G pole of the MOS transistor is connected to the output end of the continuous generator, the S pole of the MOS transistor is connected to the input end of the resistor, the D pole of the MOS transistor is connected to the power supply, the output end of the resistor is connected to the input end of the LED bulb, and the output end of the LED bulb is connected to the power supply.