JP3220656U - Control circuit used for output stabilization of light emitting diode - Google Patents

Abstract

A control circuit for stabilizing the output of a light emitting diode is provided.
A sensing module (12) is connected to a light emitting diode (11) and connected to a power supply (VCC) and senses a state parameter at light emission of the light emitting diode (11) in the control circuit (1). And the pulse width modulation generator 14 for maintaining the output of the light emitting diode 11 within a predetermined range, and the pulse width At least one switch 15 is connected to the modulation generator 14 to control the pulse width modulation generator 14 to turn on or off. The process module 13 adjusts the duty ratio of the pulse width modulation generator 14 based on the state parameter sensed by the sensing module 12 to stabilize the output of the light emitting diode 11 within a predetermined range.
[Selected figure] Figure 1

Description

  The present invention relates to a control circuit used to stabilize the output of a light emitting diode, and in particular, the process module of the control circuit adjusts the duty ratio of the pulse width modulation generator based on the state parameter sensed by the sensing module, thereby the output of the light emitting diode. The present invention relates to a control circuit used for stabilizing the output of a light emitting diode which can be stably maintained within a predetermined range, which can enhance the safety in use and extend the service life of the light emitting diode.

At present, light emitting diode applications are widely used for general lighting, educational indicators, laser levels, target pointers or laser cutters.
The output of the light emitting diode tends to be unstable due to variables such as the temperature change of the external environment, the temperature change of the light emitting module body, the difference of the electronic parts, the electrical characteristics or the artificial factor.

In the light emitting diode, if the output becomes high due to the change of these various variables, the too high output not only increases the risk of use but also shortens the service life of the light emitting diode.
On the other hand, if the output of the light emitting diode is insufficient due to the change of various variables, it affects the normal use of the light emitting diode.
In other words, light emitting diodes are prone to output instability situations due to factors such as the method of use or environment, and the yield of products that conform to such conditions is low in manufacturing, and their use or safety specifications or Situations that do not conform to the standard are also likely to occur, causing many inconveniences in use.

JP 2018-190740 A JP 2004-64239 A

  An object of the present invention is to provide a control circuit used to stabilize the output of a light emitting diode.

The control circuit according to the present invention comprises a light emitting diode whose output for emitting light is within a predetermined range, the power supply is connected to one end of the light emitting diode, and the control circuit senses a state parameter of light emission of the light emitting diode. Install a sensing module, and electrically connect to one side of the sensing module a process module that emits a modulation signal based on the sensed status parameter;
A pulse width modulation generator is electrically connected to one side of the process module for receiving the modulation signal, adjusting the duty ratio, and thereby maintaining the output of the light emitting diode within a predetermined range, and the pulse width The modulation generator has one side electrically connected to at least one switch that controls and turns on or off the pulse width modulation generator, one end of the switch is electrically connected to the light emitting diode, and the other end of the switch is connected Electrically connect the ground,
The process module adjusts the duty ratio of the pulse width modulation generator based on the state parameter sensed by the sensing module, whereby the output of the light emitting diode is stably located within the predetermined range, thus the safety in use Can extend the service life of the light emitting diode.

  According to the present invention, by keeping the output of the light emitting diode stable within a predetermined range, it is possible to enhance the safety in use and extend the service life of the light emitting diode.

It is a circuit diagram of the present invention. FIG. 7 is a circuit diagram of another embodiment of the present invention.

  As shown in FIG. 1 which is a circuit diagram of the present invention, the control circuit 1 of the present invention comprises a light emitting diode 11 such as a laser diode (LD) having an output for emitting light within a predetermined range.

  A power supply (VCC) is connected to one end of the light emitting diode 11, and a detection module 12 capable of detecting a state parameter at the time of light emission of the light emitting diode 11 is installed in the control circuit 1 And electrically connect the process module 13 that emits the modulation signal based on the sensed state parameter (such as a voltage value or a temperature value).

  The other side of the process module 13 receives a modulation signal, adjusts the duty cycle (Duty Cycle), and thereby maintains the output of the light emitting diode 11 within a predetermined range. (Modulation, PWM) are electrically connected, and at least one switch 15 for controlling the pulse width modulation generator 14 to turn on or off is electrically connected to the other side of the pulse width modulation generator 14 The one end of the switch 15 is electrically connected to the light emitting diode 11, and the ground (GND) is electrically connected to the opposite end of the switch 15.

  The sensing module 12 in the control circuit 1 includes a voltage conversion component 121 such as a photodiode, and a signal converter 122 (Analog-to-digital converter, ADC).

  One end of the voltage conversion component 121 is electrically connected between the light emitting diode 11 and the supply voltage (VCC), and both ends of the signal converter 122 are electrically connected to the voltage conversion component 121 and the process module 13, respectively. .

  The duty ratio in the pulse width modulation generator 14 of the control circuit 1 divides the pulse on time of the pulse width modulation generator 14 by the total time (on time + off time) and multiplies it by 100.

  The switch 15 of the control circuit 1 is a bipolar transistor (Bipolar Junction Transistor, BJT), a field effect transistor (FET), an N channel MOS field effect transistor (n-channel Metal-Oxide-Semiconductor Field-Effect Transistor). ), P-channel Metal-Oxide-Semiconductor Field-Effect Transistors, Junction Field Effect Transistors (JFETs), etc. .

  In practical application, the control circuit 1 is applied to the circuit of a laser product such as a laser indicator, a general educational indicator, a laser level, a target pointer or a laser cutter.

  One end of the light emitting diode 11 of the control circuit 1 receives the supply voltage (VCC), the current passes through the light emitting diode 11 and is transmitted to the switch 15, and the current is further transmitted to the ground (GND) direction. Conduct.

  At this time, the light emitting diode 11 emits light within a predetermined output range, and at the same time, the sensing module 12 converts the light energy when the light emitting diode 11 emits a light beam into electrical energy through the voltage conversion component 121. A converter 122 is used to convert the electrical energy into a digital signal, and the signal converter 122 further transmits the digital signal to the process module 13.

  After receiving the digital signal, the process module 13 records the output of the light emitting diode 11 in a voltage state parameter within a predetermined range, thereby using the voltage state parameter as a reference value for the subsequent determination.

  When the output of the light emitting diode 11 of the control circuit 1 rises or falls and deviates from the predetermined range, the voltage conversion component 121 of the sensing module 12 converts the light energy too high or too low into electric energy to convert the signal converter 122 convert the electrical energy into a digital signal and transmit it to the process module 13, and the process module 13 compares this voltage state parameter with the recorded reference value, so that the output of the light emitting diode 11 It can be sensed that the predetermined range has been definitely deviated.

  At this time, the process module 13 sends the modulation signal to the pulse width modulation generator 14, and after receiving the modulation signal, the pulse width modulation generator 14 adjusts the duty ratio, thereby increasing the duty ratio or descend.

  Thus, the output of the light emitting diode 11 decreases or rises back to within the predetermined range, whereby the light emitting diode 11 stably emits a laser beam of an output that fits within the predetermined range, and the safety and usability in use The service life of the light emitting diode 11 can be extended.

  As shown in FIG. 2 which is a circuit diagram of another embodiment of the present invention, the sensing module 12 of the other embodiment of the present invention can omit the use of the signal converter 122 and electrically connect on the process module 13 And a temperature sensing component 123 capable of sensing the working temperature of the control circuit 1 is added.

  When the light emitting diode 11 emits light at an output that is within a predetermined range, the temperature sensing component 123 senses the current working temperature of the control circuit 1 and senses with the process module 13 to record temperature condition parameters .

  When the output of the light emitting diode 11 is too high or too low and the working temperature of the control circuit 1 does not match the temperature condition parameter recorded in the process module 13, the process module 13 generates the pulse width modulation generator 14 with the modulation signal. Send to

  Thus, the duty ratio is adjusted by the pulse width modulation generator 14 to increase or decrease the duty ratio, whereby the output of the light emitting diode 11 is reduced or increased to return within the predetermined range, and the light emitting diode 11 is stable. At the output, the laser beam emitting within the predetermined range is emitted, and by using the temperature sensing method, the light emitting diode 11 can emit the laser beam of the output stably conforming within the predetermined range.

  The sensing module 12 of the other embodiment described above senses temperature using only the temperature sensing component 123, and the process module 13 detects the temperature of the pulse width modulation generator 14 based on the temperature condition parameter sensed by the temperature sensing component 123. In order to adjust the duty ratio, the voltage conversion component 121 of the sensing module 12 can be omitted in actual use.

  Taken together, by using the control circuit for stabilizing the output of the light emitting diode according to the present invention, its effect and purpose can be surely achieved in use.

  The present invention has novelty which is a requirement of utility model registration, has sufficient progress compared with conventional similar products, is highly practical, meets social needs, and is extremely useful for industrial use. large.

DESCRIPTION OF SYMBOLS 1 control circuit 11 light emitting diode 12 sensing module 121 voltage conversion component 122 signal converter 123 temperature sensing component 13 process module 14 pulse width modulation generator 15 switch VCC supply voltage GND ground

Claims (3)

A control circuit used to stabilize the output of a light emitting diode,
The control circuit includes a light emitting diode which emits light in a certain output range,
Connect a power supply to one end of the light emitting diode,
Further, in the control circuit, a sensing module for sensing a state parameter at the time of light emission of the light emitting diode is installed, and on the other side of the sensing module, a process module for emitting a modulation signal is electrically connected based on the sensed state parameter;
The process module is electrically connected to a pulse width modulation generator which receives the modulation signal and adjusts the duty ratio, thereby maintaining the output of the light emitting diode within the predetermined range, and pulse width modulation On one side of the generator, at least one switch to control and turn on or off the pulse width modulation generator is electrically connected, one end of the switch is electrically connected to the light emitting diode and the other end of the switch is grounded The control circuit used for the output stabilization of the light emitting diode characterized by having electrically connected. The sensing module in the control circuit includes a voltage conversion component that senses light energy emitted by the light emitting diode and converts it into electrical energy, and a signal converter that converts the electrical energy into a digital signal, and one end of the voltage conversion component Electrically connected between the light emitting diode and the supply voltage,
The control circuit for output stabilization of a light emitting diode according to claim 1, wherein both ends of the signal converter are electrically connected to a voltage conversion component and a process module, respectively. The control circuit for output stabilization of a light emitting diode according to claim 1, wherein the sensing module is electrically connected to the process module and is provided with a temperature sensing component that senses the working temperature of the control circuit. .

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