TWM576360U - Regulating circuit for stabilizing luminous power of light-emitting diode - Google Patents

Abstract

The present invention relates to a control circuit for stabilizing the luminous power of a light-emitting diode, wherein one end of the light-emitting diode of the control circuit is connected with a supply voltage, and is provided in the control circuit for sensing light-emitting diodes to emit light. a sensing module of the state parameter, and the processing module is electrically connected with a processing module for transmitting a modulation signal according to the sensed state parameter, and the processing module is electrically connected with the receiving modulation signal. a pulse width modulation generator that adjusts the duty ratio to maintain the output power of the LED in a preset range, and at least one of the pulse width modulation generators is electrically connected to the pulse width modulation generator to be turned on. Or a switch that is closed, because the processing module can adjust the duty ratio of the pulse width modulation generator according to the state parameter sensed by the sensing module, thereby achieving the stable emission power of the light emitting diode in a preset range. The effect in the middle.

Description

Regulating circuit for stabilizing luminous power of light-emitting diode

The present invention provides a control circuit for stabilizing the luminous power of the LED, and in particular, the processing module of the control circuit can adjust the duty ratio of the pulse width modulation generator according to the state parameter sensed by the sensing module. Thereby, the emitting power of the light emitting diode is stably located in a preset range to improve the safety in use and the service life of the light emitting diode.

According to the current use of the light-emitting diode has been widely used in general lighting, teaching indicators, level, sight or laser cutter, etc., in addition, the light-emitting diode will change due to external environmental temperature, light The module body temperature change, electronic component difference, electrical characteristics or human factors and other variables, resulting in unstable luminous power of the LED.

However, the light-emitting diode causes the output power to be high due to various variables, and the excessive output power not only increases the danger of use, but also reduces the service life of the light-emitting diode, and The change of the variable causes the output power of the light-emitting diode to be insufficient to affect the normal use of the light-emitting diode. Therefore, the light-emitting diode is liable to be unstable in output power due to factors such as usage mode or environment, so that the product yield is good. Poor, and easy to comply with various uses or safety regulations, resulting in a lot of inconvenience in use.

Therefore, how to solve the above-mentioned lack of inconvenience and inconvenience is the direction that the relevant industry is eager to study and improve.

Therefore, in view of the above problems and deficiencies, the creators have collected relevant materials and, through multi-party evaluation and consideration, have designed such a new type of control circuit for stabilizing the luminous power of the LED.

The main purpose of the present invention is that the control circuit includes a light-emitting diode having a light output power within a preset range, and a supply voltage is connected to one end of the light-emitting diode, and then provided in the control circuit. a sensing module for sensing a state parameter of the light emitting diode when the light emitting diode is illuminated, and the sensing module side is electrically connected with a processing module that emits a modulated signal according to the sensed state parameter, and the processing module side The pulse width modulation generator receives the modulation signal to adjust the duty ratio to maintain the output power of the LED in a preset range, and the pulse width modulation generator is electrically connected to at least one side. The pulse width modulation generator controls the switch to be turned on or off, and is electrically connected to the light emitting diode at one end of the switch, and the grounding voltage is electrically connected to the other end of the switch, and the processing module can be based on the sensing module. The sensed state parameter adjusts the duty ratio of the pulse width modulation generator, thereby stabilizing the emitted power of the light emitting diode in a preset range, thereby achieving safety in use and light emitting diode Life of purpose.

1‧‧‧Control circuit

11‧‧‧Lighting diode

12‧‧‧Sensor module

121‧‧‧Voltage conversion components

122‧‧‧Signal Converter

123‧‧‧Temperature sensing components

13‧‧‧Processing module

14‧‧‧ pulse width modulation generator

15‧‧‧ switch

VCC‧‧‧ supply voltage

GND‧‧‧ Grounding voltage

The first diagram is a circuit diagram of the creation.

The second figure is a circuit diagram of another embodiment of the creation.

In order to achieve the above objectives and effects, the technical means and structure of the present invention are described in detail in the preferred embodiment of the present creation, and the features and functions are as follows. To understanding.

Please refer to the first figure, which is a circuit diagram of the creation. It can be clearly seen from the figure that the control circuit 1 of the present invention includes a light-emitting diode with a light output power within a preset range. 11 (for example, a laser diode (LD)), and a supply voltage (VCC) is connected to one end of the light-emitting diode 11, and then the sensing circuit 1 is provided with a sensing light-emitting diode 11 The sensing module 12 of the state parameter when the light is emitted, and the sensing module 12 is electrically connected with a processing module capable of emitting a modulated signal according to the sensed state parameter (eg, voltage value or temperature value, etc.) The processing module 13 is electrically connected to the pulse width modulation generator 14 that receives the modulation signal to adjust the duty cycle (Duty Cycle) to maintain the output power of the LED 11 within a preset range. Pulse-Width Modulation (PWM), and the pulse width modulation generator 14 is electrically connected to at least one switch 15 that can be turned on or off by the pulse width modulation generator 14 and electrically connected to one end of the switch 15 Light-emitting diode 11 and the other end of the switch 15 is electrically connected to a ground voltage (GND)

The sensing module 12 in the control circuit 1 includes a voltage conversion component 121 (such as a photodiode) and an analog-to-digital converter (ADC), wherein the voltage conversion component One end of the signal converter 122 is electrically connected between the light-emitting diode 11 and the supply voltage (VCC), and the two ends of the signal converter 122 are electrically connected to the voltage conversion element 121 and the processing module 13 respectively.

Furthermore, the duty ratio in the pulse width modulation generator 14 of the above-described control circuit 1 refers to the pulse on time of the pulse width modulation generator 14 divided by the total time (on time) Plus off time) *100%.

However, the switch 15 of the above control circuit 1 may be a Bipolar Junction Transistor (BJT), a Field-Effect Transistor (FET), or an N-channel MOS field-effect transistor (n- Channel Metal-Oxide-Semiconductor Field-Effect Transistor), P-channel Metal-Oxide-Semiconductor Field-Effect Transistor or Junction Field Effect Transistor (JFET) Transistor.

When the present invention is actually used, the control circuit 1 is applicable to a laser device such as a lightning indicator, a general teaching indicator, a level, a sight or a laser cutter, and the illumination circuit 1 is illuminated. The end of the pole body 11 receives the supply voltage (VCC), so that the current flows through the light-emitting diode 11 and is transmitted to the switch 15, and then the current is transmitted toward the ground voltage (GND), thereby turning on the overall circuit of the regulating circuit 1. The light-emitting diode 11 emits light having a power output within a predetermined range, and the sensing module 12 transmits the light energy when the light-emitting diode 11 emits light through the voltage conversion element 121. The power is converted into a digital signal by using the signal converter 122, and the digital signal is transmitted to the processing module 13 by the signal converter 122, and the processing module 13 records the light after receiving the digital signal. The voltage state of the output power of the diode 11 within a preset range The parameter is such that the voltage state parameter can be used as a reference value for subsequent judgment.

If the output power of the LED 11 of the control circuit 1 is increased or decreased beyond the preset range, the voltage conversion component 121 of the sensing module 12 converts the light energy that is too high or too low into electrical energy, and The signal converter 122 is used to convert the electrical energy into a digital signal and transmit it to the processing module 13 to compare the voltage state parameter with the recorded reference value by the processing module 13 to learn the light-emitting diode. The output power of the body 11 is indeed outside the preset range. At this time, the processing module 13 sends a modulation signal to the pulse width modulation generator 14, and after receiving the modulation signal, the pulse width modulation generator 14 receives the modulation signal. The duty ratio is adjusted to increase or decrease the duty ratio, thereby causing the output power of the LED 11 to fall or rise back to a preset range, thereby causing the LED 11 to stably output power in accordance with a preset range. The laser beam is used to improve the safety of use and the utility of the life of the LED 11.

Referring to the second embodiment, it is a circuit diagram of another embodiment of the present invention. As can be clearly seen from the figure, the sensing module 12 of another embodiment of the present invention can be used to omit the signal converter 122. The temperature sensing element 123 is electrically connected to the processing module 13 and can sense the operating temperature of the regulating circuit 1 . When the light emitting diode 11 emits light with an output power within a preset range, the temperature sensing element 123 In order to sense the operating temperature of the control circuit 1 at the time, and to record the sensed temperature state parameter by the processing module 13, if the output power of the LED 11 is too high or too low, so that the control circuit 1 When the operating temperature deviates from the temperature state parameter originally recorded by the processing module 13, the processing module 13 sends a modulation signal to the pulse width modulation generator 14, and then adjusts the duty ratio through the pulse width modulation generator 14. In order to increase or decrease the duty ratio, thereby reducing or increasing the output power of the light-emitting diode 11 Returning to the preset range, so that the light emitting diode 11 can stably emit the laser beam in accordance with the preset range, the temperature sensing method can be used to make the light emitting diode 11 stably emit power according to the preset. Laser beam in the range.

The sensing module 12 of the other embodiment can sense the temperature only by using the temperature sensing component 123, so that the processing module 13 can adjust the pulse width according to the temperature state parameter sensed by the temperature sensing component 123. The duty ratio of the generator 14 is modulated, so that the voltage conversion element 121 of the sensing module 12 can be omitted for practical use.

The above detailed description is intended to illustrate a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and other equivalents and modifications may be made without departing from the spirit of the invention. Changes are to be included in the scope of patents covered by this creation.

In summary, the above-mentioned control circuit for stabilizing the luminous power of the LED is used to achieve its efficacy and purpose. Therefore, the creation is a practical and excellent creation, in line with the new patent. Apply for the requirements, and apply in accordance with the law. I hope that the trial committee will grant the case as soon as possible to protect the creators' hard work. If there is any doubt in the trial committee, please do not hesitate to give instructions. The creators will try their best to cooperate with them.

Claims (3)

A regulating circuit for stabilizing the luminous power of a light-emitting diode, wherein the regulating circuit comprises a light-emitting diode that emits light with an output power within a preset range, and a supply voltage is connected to one end of the light-emitting diode, and then The control circuit is provided with a sensing module for sensing a state parameter when the light emitting diode emits light, and the sensing module side is electrically connected with a processing module that emits a modulated signal according to the sensed state parameter. The processing module is electrically connected with a pulse width modulation generator that receives the modulation signal to adjust the duty ratio to maintain the output power of the LED in a preset range, and the pulse width modulation generator side The electrical connection has at least one switch for controlling the opening or closing of the pulse width modulation generator, and is electrically connected to the light emitting diode at one end of the switch, and the grounding voltage is electrically connected to the other end of the switch. The control circuit for stabilizing the illuminating power of the illuminating diode according to the first aspect of the invention, wherein the sensing module in the regulating circuit comprises a voltage for converting light energy emitted by the illuminating diode into electric energy. a conversion component, and a signal converter for converting electrical energy into a digital signal, wherein one end of the voltage conversion component is electrically connected between the light emitting diode and the supply voltage, and the two ends of the signal converter are electrically connected to the voltage conversion Components and processing modules. The control circuit for stabilizing the illuminating power of the illuminating diode according to the first aspect of the invention, wherein the sensing module is provided with a temperature electrically connected to the processing module and configured to sense the operating temperature of the regulating circuit Sensing element.