LED light source

Abstract

An LED light source relates to an electric light source and comprises a power supply circuit, an MCU circuit, a linear dimming circuit, a human body sensor and an LED lamp, the linear dimming circuit comprises a linear dimming chip, the power supply circuit, the LED lamp and the linear dimming circuit are sequentially connected in series, the MCU circuit can output PWM control signals, the signal output end of the human body sensor is connected with the signal input end of an MCU of the MCU circuit, and the signal output end of the human body sensor is connected with the signal input end of the MCU. And the signal output end of the MCU of the MCU circuit is connected with the signal input end of the linear dimming chip of the linear dimming circuit. Compared with the prior art, the utility model has the advantages of multiple functions and capability of meeting the requirements of users.

Description

Technical Field

[0001] The utility model relates to an electric light source, in particular to an LED light source. Background Art

[0002] Existing LED light sources, such as those used in bathroom cabinet mirrors, require contactless control to facilitate user use. Existing technologies generally only provide on and off functions: when a user enters the sensing range of a sensor, the controller controls the LED light source to turn on; when the user leaves the sensing range of the sensor, the controller controls the LED light source to turn off. This single-function LED light source cannot meet user requirements. Summary of the Invention

[0003] The purpose of the present invention is to provide an LED light source with diverse functions that can meet the requirements of users.

[0004] The utility model is implemented as follows: it includes a power supply circuit, an MCU circuit, a linear dimming circuit, a human body sensor, and an LED lamp. The linear dimming circuit includes a linear dimming chip. The power supply circuit, the LED lamp, and the linear dimming circuit are connected in series in sequence. The MCU circuit is an MCU circuit that can output a PWM control signal. The signal output end of the human body sensor is connected to the signal input end of the MCU of the MCU circuit, and the signal output end of the MCU of the MCU circuit is connected to the signal input end of the linear dimming chip of the linear dimming circuit.

[0005] When in use, it is assumed that the LED light is in the off state and the LED light is in the full power waiting to be triggered state;

[0006] When the user waves his hand in front of the human body sensor, the MCU outputs a PWM control signal with the largest duty cycle, which controls the linear dimming circuit to light up the LED lamp at full power.

[0007] When the user's hand stays in front of the human body sensor, the MCU outputs a PWM control signal with a gradually decreasing duty cycle;

[0008] Before the duty cycle of the output PWM control signal reaches the minimum, the user's hand leaves the human body sensor. The duty cycle of the PWM control signal output by the MCU is the real-time duty cycle. The MCU retains the memory of the change trend of the duty cycle of the PWM control signal (in this case, the memory is decreasing);

[0009] When the user's hand is placed in front of the human body sensor again, the duty cycle of the PWM control signal output by the MCU continues to decrease gradually until the duty cycle of the output PWM control signal reaches the minimum, and then the duty cycle of the output PWM control signal gradually increases;

[0010] When the user's hand moves in front of the human body sensor, the MCU stops outputting the PWM control signal, the LED light turns off, and the MCU retains the memory of the duty cycle change trend of the PWM control signal (in this case, the memory is increasing).

[0011] The utility model adopts an MCU circuit, a linear dimming circuit, and a human body sensor, and controls the output or stop of the PWM control signal and the duty cycle of the output PWM control signal according to the information written into the MCU according to the sensing signal to control the switching and brightness of the LED lamp, thereby facilitating the use of the user. Moreover, the utility model is easy to use, has a simple circuit structure, low cost, and high reliability.

[0012] Compared with the prior art, the utility model has the advantages of diverse functions and can meet the requirements of users. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is the circuit diagram of the LED light source of the utility model.

[0014] Description of the accompanying figures: 1-power supply circuit; 2-MCU circuit; 3-linear dimming circuit; 4-human body sensor; 5-LED lamp; U1-linear dimming chip; U3-MCU. DETAILED DESCRIPTION

[0015] The LED light source of the present invention will be further described in detail with reference to the accompanying drawings and embodiments.

[0016] As shown in the figure, the LED light source of the present invention includes a power supply circuit 1, an MCU circuit 2, a linear dimming circuit 3, a human body sensor 4, and an LED lamp 5. The linear dimming circuit 1 includes a linear dimming chip U1. The power supply circuit 1, the LED lamp 5, and the linear dimming circuit 1 are connected in series in sequence. The MCU circuit 2 is an MCU circuit that can output a PWM control signal. The signal output end of the human body sensor 4 is connected to the signal input end of the MCU (U3) of the MCU circuit 2. The signal output end of the MCU of the MCU circuit 2 is connected to the signal input end of the linear dimming chip U1 of the linear dimming circuit 3.

[0017] When in use, it is assumed that the LED lamp 5 is in the off state and the LED lamp 5 is in the full power ready-to-trigger state (at this time, the MCU is in the ready-to-trigger state of outputting the PWM control signal with the largest duty cycle);

[0018] When the user waves his hand in front of the human body sensor 4, the MCU circuit 2 is triggered, and the MCU outputs a PWM control signal with the largest duty cycle, which controls the linear dimming circuit 3 to light up the LED lamp 5 at full power;

[0019] When the user's hand stays in front of the human body sensor 4, the MCU outputs a PWM control signal with a gradually decreasing duty cycle;

[0020] Before the duty cycle of the output PWM control signal reaches the minimum, the user's hand leaves the human body sensor 4, and the duty cycle of the PWM control signal output by the MCU becomes the real-time duty cycle and remains unchanged. The MCU retains the memory of the duty cycle change trend of the PWM control signal (in this case, the memory of the duty cycle decreasing);

[0021] When the user's hand is placed in front of the human body sensor 4 again, the MCU will gradually reduce the duty cycle of the PWM control signal output according to the duty cycle change trend memory until the duty cycle of the PWM control signal output reaches the minimum. Then, the duty cycle of the PWM control signal output will gradually increase again.

[0022] When the user's hand moves in front of the human body sensor 4, the MCU circuit 2 is triggered, the MCU stops outputting the PWM control signal, and the LED light 5 is turned off. The MCU retains the memory of the duty cycle change trend of the PWM control signal (in this case, the memory is increasing).

Claims

1. An LED light source, characterized in that: It includes a power supply circuit, an MCU circuit, a linear dimming circuit, a human body sensor, and an LED lamp. The linear dimming circuit includes a linear dimming chip. The power supply circuit, the LED lamp, and the linear dimming circuit are connected in series in sequence. The MCU circuit is an MCU circuit that can output a PWM control signal. The signal output end of the human body sensor is connected to the signal input end of the MCU of the MCU circuit, and the signal output end of the MCU of the MCU circuit is connected to the signal input end of the linear dimming chip of the linear dimming circuit.

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