Light source control system

Abstract

The light source control system at least comprises a switching power supply and a control circuit, the switching power supply is provided with an input end connected with a power supply and an output end connected with a light emitting diode light source, and the switching power supply is provided with a PWMD dimming pin and an LD dimming pin. The control circuit is provided with a photosensitive component and a resistor which are connected in series, one end of the control circuit is connected with a direct-current voltage, the other end of the control circuit is a grounding end, and the series connection position of the photosensitive component and the resistor is connected to the PWMD dimming pin or the LD dimming pin. The light sensing assembly is used for sensing ambient brightness so as to enable the control circuit to output a control voltage, and the control voltage is input to the switching type power supply through the PWMD dimming pin or the LD dimming pin so as to control the light emitting diode light source to be turned on or turned off. Therefore, the light-emitting diode light source can be controlled to be automatically turned on or turned off.

Description

Technical Field

[0001] The present invention relates to a light source control system, and more particularly to a light source control system that can automatically turn on or off a light emitting diode (LED) according to the brightness of an external environment, and more particularly to a light source control system that is applied to a switching power supply as a power source. Background Art

[0002] Light Emitting Diode (LED) has the advantages of light weight, small size, low pollution and long life. As a new type of light source, it has been increasingly used in the field of lighting.

[0003] Currently, most LED lamps on the market rely on plug-in or USB charging, and require manual on / off control. If you neglect or forget to turn off the light, not only does it waste electricity and energy, but the heat generated by prolonged use can also wear out the lamp, shortening its lifespan. This has led to the emergence of sensor-based lamps, which primarily incorporate sensors that control the lighting and deactivation of the lamp. These sensors automatically activate the lamp when lighting is needed, saving energy and extending the lifespan of the sensor-based lamp.

[0004] Known induction lamps often utilize infrared transmission and reception technology to achieve induction control. These primarily utilize passive infrared sensors (PIR) for detection. They use infrared to detect the presence of moving objects with a certain temperature within a certain range, thereby determining whether a person or animal has entered or left the environment. When a person / animal is detected, the lamp automatically turns on, and automatically turns off after a period of time. This saves energy and extends the lamp's lifespan.

[0005] Another type of sensor-based lighting fixture uses a brightness sensor module to control the light source. This module automatically turns the lamp on and off based on the ambient brightness. This allows the lamp to automatically turn on at night and off during the day. This not only provides convenience but also helps conserve energy. Therefore, developing a more ideal and practical sensor-based light control system is a highly anticipated goal for consumers and a key research and development goal for related industry players. Summary of the Invention

[0006] The present invention provides a light source control system, in particular a light source control system that can automatically turn on or off the light emitting state of a light emitting diode according to the external ambient brightness, and is particularly suitable for use with a switching power supply as a power source.

[0007] To achieve the above-mentioned objectives, the light source control system of the present invention includes at least: a switching power supply having an input terminal connected to a power source and an output terminal connected to an LED light source, the switching power supply having a PWMD (PWMDimming) dimming pin; and a control circuit having a photosensitive element and a resistor connected in series, one terminal of the control circuit being connected to a DC voltage and the other terminal of the control circuit being grounded, and the connection between the photosensitive element and the resistor being connected in series to the PWMD dimming pin. The photosensitive element is used to sense ambient brightness so as to cause the control circuit to output a control voltage. The control voltage is input to the switching power supply through the PWMD dimming pin to control the LED light source to turn on or off.

[0008] The present invention utilizes a photosensitive component to sense ambient brightness, thereby controlling the LED light source to automatically turn on or off. Furthermore, the control circuit of the present invention can be directly connected to the LED light source's switching power supply, eliminating the need to modify the existing switching power supply circuit design. This allows the LED light source to be automatically turned on or off, thereby saving energy. Furthermore, the device is convenient to install, which helps increase user satisfaction.

[0009] In a preferred embodiment, the resistor is connected in series with the DC voltage, and the photosensitive element is connected in series between the resistor and the ground terminal.

[0010] In a preferred embodiment, the photosensitive element is connected in series with the DC voltage, and the resistor is connected in series between the photosensitive element and the ground terminal, and the series connection between the photosensitive element and the resistor is connected to the PWMD dimming pin via an inverter.

[0011] The present invention provides another light source control system that at least includes: a switching power supply having an input end connected to a power source and an output end connected to a light-emitting diode (LED) light source, the switching power supply having an LD (Linear Dimming) dimming pin; and a control circuit having a photosensitive element and a resistor connected in series, one end of the control circuit being connected to a DC voltage, the other end of the control circuit being grounded, and the series connection between the photosensitive element and the resistor being connected to the LD dimming pin. The photosensitive element is used to sense ambient brightness so that the control circuit outputs a control voltage that varies with ambient brightness. The control voltage is input to the switching power supply through the LD dimming pin to control the LED light source to turn on or off.

[0012] In a preferred embodiment, the resistor is connected in series with the DC voltage, and the photosensitive element is connected in series between the resistor and the ground end, and the series connection between the photosensitive element and the resistor is connected to the LD dimming pin via a diode.

[0013] In a preferred embodiment, the diode has a forward bias. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the first embodiment of the light source control system in the present invention.

[0015] Figure 2 It is a structural diagram of the second embodiment of the light source control system in the present invention.

[0016] Figure 3 It is a structural diagram of the third embodiment of the light source control system in the present invention.

[0017] Figure 4 It is a structural diagram of the fourth embodiment of the light source control system in the present invention.

[0018] Explanation of symbols: DC voltage V Light source control system 1 Switching power supply 10 Input 11 Output 12 PWMD dimming pin 13 LD dimming pin 14 Control circuit 20 Photosensitive component 21 Resistor 22 Ground terminal 23 Inverter 24 Diode 25 LED light source 30 Light emitting diode 31. DETAILED DESCRIPTION

[0019] like Figure 1 The light source control system 1 of the present invention is shown as a structural diagram of the first embodiment. The light source control system 1 of the present invention comprises at least: a switching power supply 10 and a control circuit 20; wherein: The switching power supply 10 has an input terminal 11 connected to a power source and an output terminal 12 connected to an LED light source 30 . The switching power supply 10 has a PWMD (PWM Dimming) dimming pin 13 and an LD (Linear Dimming) dimming pin 14 . The LED light source 30 may include at least one LED 31 .

[0020] The control circuit 20 includes a photosensitive element 21 and a resistor 22 connected in series. One end of the control circuit 20 is connected to a DC voltage V, and the other end is connected to a ground terminal 23. The connection between the photosensitive element 21 and the resistor 22 is connected to the PWMD dimming pin 13. In the first embodiment shown in the figure, the resistor 22 is connected in series to the DC voltage V, and the photosensitive element 21 is connected in series between the resistor 22 and the ground terminal 23. The photosensitive element 21 senses ambient brightness. When the ambient brightness is brighter, the resistance of the photosensitive element 21 decreases. When the ambient brightness is darker, the resistance of the photosensitive element 21 increases, causing the control circuit 20 to output a control voltage. This control voltage is input to the switching power supply 10 through the PWMD dimming pin 13 to control the LED light source 30 to turn on or off. The photosensitive element 21 can be a photoresistor, a photodiode, a phototransistor, a solar panel, or other electronic component whose impedance changes with light.

[0021] In practical use, the input terminal 11 of the light source control system 1 is first connected to a power source. The light sensor 21 senses the ambient brightness. When the ambient brightness is brighter, the resistance of the light sensor 21 decreases. The DC voltage V, through the interaction of the light sensor 21 and the resistor 22, outputs a lower control voltage. This voltage is then input to the switching power supply via the PWMD dimming pin 13, thereby turning off the LED light source 30. Conversely, when the ambient brightness is darker, the resistance of the light sensor 21 increases, outputting a higher control voltage to the PWM dimming pin 13, thereby turning on the LED light source 30. Therefore, the present invention only requires connecting the control circuit 20 to the existing PWMD dimming pin 13 of the switching power supply 10. By sensing the ambient brightness, the control circuit 20 outputs a higher control voltage or a lower control voltage, respectively. This automatically switches the LED light source 30 on and off without shutting down the power supply. Furthermore, the control circuit 20 senses the ambient brightness and automatically turns the LED light source 30 on or off in response to the ambient brightness.

[0022] The existing PWMD dimming pin 13 of the switching power supply 10 of the present invention utilizes a PWM digital signal to rapidly turn the LED light source 30 on and off multiple times to achieve dimming. Compared to the present invention, the PWMD dimming pin 13 functions as a switch. The control circuit 20 senses the ambient brightness. When the ambient brightness is brighter, the control circuit 20 outputs a lower control voltage to the PWM dimming pin 13, thereby turning the LED light source 30 off. When the ambient brightness is darker, the control circuit 20 outputs a higher control voltage to the PWM dimming pin 13, thereby turning the LED light source 30 on. This allows the user to automatically turn the LED light source 30 on and off without manually switching it on and off. In other words, the control circuit outputs an analog signal to control the PWMD dimming pin to turn the LED light source on and off, changing the existing PWMD dimming pin's dimming function to function as a switch.

[0023] Furthermore, if Figure 2 As shown in the second embodiment, the photosensitive element 21 is connected in series with the DC voltage V, and the resistor 22 is connected in series between the photosensitive element 21 and the ground terminal 23. The connection point of the photosensitive element 21 and the resistor 22 is connected to the PWMD dimming pin 13 through an inverter 24. The photosensitive element 21 is also used to sense the external ambient brightness, so that the control circuit 20 outputs a control voltage. The control voltage is input to the switching power supply through the PWMD dimming pin 13 to control the LED light source 30 to turn on or off.

[0024] The third embodiment of the present invention can be found in Figure 3As shown, the control circuit 20 can also be connected to the LD dimming pin 14. In the embodiment shown in the figure, the resistor 22 is connected in series with the DC voltage V, and the photosensitive element 21 is connected in series between the resistor 22 and the ground terminal 23. The photosensitive element 21 is used to sense the ambient brightness so as to cause the control circuit 20 to output a control voltage. The control voltage is input to the switching power supply 10 through the LD dimming pin 14 to control the light emitting diode light source 30 to turn on or off. The photosensitive element 21 senses the external ambient brightness to form different resistance values. When the photosensitive element 21 senses that the external ambient brightness is darker, the control circuit 20 outputs a higher control voltage to the LD dimming pin 14. At this time, the LED light source 30 automatically turns on and emits light. If the light-sensing element 21 senses that the external ambient brightness is brighter, the control circuit 20 outputs a lower control voltage to the LD dimming pin 14, and the LED light source 30 automatically turns off. Therefore, the present invention only requires connecting the control circuit 20 to the existing LD dimming pin 14 of the switching power supply 10. By sensing the external ambient brightness and outputting a higher control voltage or a lower control voltage, the LED light source 30 can be automatically turned on or off without turning off the power supply. Moreover, the control circuit 20 is used to sense the external ambient brightness and automatically turns the LED light source 30 on or off in response to the external ambient brightness.

[0025] Furthermore, if Figure 4 As shown in the fourth embodiment, the series connection point of the photosensitive element 21 and the resistor 22 can be further connected to the LD dimming pin 14 via a diode 25. By providing the diode 25, its forward bias voltage is used as a threshold voltage, so that the control voltage is higher than the forward bias voltage of the diode before it can be turned on and input to the switching power supply 10 through the LD dimming pin 14. This can improve the problem of the LED light source 30 flickering due to the control voltage being too low due to low external brightness. When the external environment is brighter, the control voltage can be reduced to zero earlier by the forward bias voltage of the diode, effectively turning off the LED light source 30, thus solving the flickering problem of the LED light source 30.

[0026] In addition, in the above embodiment, the input end of the switching power supply can be directly connected to a DC power source, or connected to an AC power source through a rectifier circuit.

[0027] The present invention merely requires connecting the control circuit 20 to the existing PWMD dimming pin 13 or LD dimming pin 14 of the switching power supply 10, without changing the original circuit design of the switching power supply. This allows the LED light source to be automatically turned on or off, saving energy and providing convenient installation, which helps increase user convenience. The light sensor 21 primarily senses ambient brightness, allowing the LED light source to be automatically turned on or off without turning off the power supply, eliminating the need for manual control by the user, thus increasing convenience and practicality. Currently, most LED lamps on the market use switching power supplies as their power source. Users only need to connect the control circuit of the present invention to the existing PWMD dimming pin or LD dimming pin of the switching power supply to obtain a sensor-activated lamp with a simple structure that allows for user-friendly operation.

Claims

1. A light source control system, characterized in that: At least: A switching power supply having an input terminal connected to a power source and an output terminal connected to a light emitting diode light source, the switching power supply having a PWMD dimming pin; as well as A control circuit having a photosensitive element and a resistor connected in series, one end of the control circuit being connected to a DC voltage, the other end of the control circuit being grounded, and the connection point of the photosensitive element and the resistor being connected in series to the PWMD dimming pin, the photosensitive element being used to sense ambient brightness; When the ambient brightness is brighter, the resistance value of the photosensitive element is lower, causing the control circuit to output a lower control voltage. The lower control voltage is input to the switching power supply through the PWMD dimming pin, thereby turning off the LED light source. When the ambient brightness is darker, the resistance value of the photosensitive element is higher, causing the control circuit to output a higher control voltage. The higher control voltage is input to the switching power supply through the PWMD dimming pin, thereby controlling the LED light source to turn on.

2. The light source control system according to claim 1, wherein: The resistor is connected in series with the DC voltage, and the photosensitive element is connected in series between the resistor and the ground terminal.

3. The light source control system according to claim 1, wherein: The photosensitive element is connected in series with the DC voltage, and the resistor is connected in series between the photosensitive element and the ground terminal. The connection point between the photosensitive element and the resistor is connected to the PWMD dimming pin via an inverter.

4. A light source control system, characterized in that: At least: A switching power supply having an input terminal connected to a power source and an output terminal connected to a light emitting diode (LED) light source, the switching power supply having an LD dimming pin; as well as A control circuit having a photosensitive element and a resistor connected in series, one end of the control circuit being connected to a DC voltage and the other end being grounded, and the connection point of the photosensitive element and the resistor being connected in series to the LD dimming pin, the photosensitive element being used to sense ambient brightness; When the ambient brightness is brighter, the resistance value of the photosensitive component is lower, causing the control circuit to output a lower control voltage. The control voltage is input to the switching power supply through the LD dimming pin, thereby turning off the LED light source. When the ambient brightness is darker, the resistance value of the photosensitive component is higher, causing the control circuit to output a higher control voltage. The control voltage varies with the ambient brightness. The control voltage is input to the switching power supply through the LD dimming pin to control the LED light source to turn on.

5. The light source control system according to claim 4, wherein: The resistor is connected in series with the DC voltage, and the photosensitive element is connected in series between the resistor and the ground end. The connection point between the photosensitive element and the resistor is connected to the LD dimming pin via a diode.

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