AC power conversion circuit, LED control circuit and LED lights

Abstract

This invention provides a mains power conversion circuit, including a first diode, a second diode, a first switch, and a second switch. The first and second diodes are connected in series on the L line of the mains power supply, and the cathode of the first diode is connected to the cathode of the second diode. The first and second switches are connected in parallel with the first and second diodes, respectively. This invention also provides an LED control circuit using the mains power conversion circuit described above. The control circuit detects the output waveform of the mains power conversion circuit and controls the LED to switch to the corresponding light emission mode. This invention also provides an LED lamp using the LED control circuit described above.

Description

Technical Field

[0001] This utility model relates to lighting devices, and more particularly to LED lighting devices. Background Technology

[0002] Chinese patent CN109275229A provides a dimming circuit and its implementation method for detecting AC power supply waveforms. It dims the LED by detecting the input AC waveform, offering more dimming levels compared to traditional segmented dimming, and is simple to operate, making it convenient for the elderly and children. However, its technical solution only supports three dimming levels: when K1 is switched to level one, the circuit is not conducting; when K1 is switched to level two, the output AC power only has a positive half-cycle waveform, and the control unit MCU enters gradual dimming, cycling through 100%-10%-100% without further operation; when K1 is switched to level three, the LED brightness is fixed at a certain level and no longer changes. In other words, the LED in prior art only has three modes: completely off, fixed brightness, and gradual dimming. Especially during gradual dimming, additional operation is required to determine and maintain a specific brightness within the gradual dimming range; otherwise, the gradual dimming continues in a loop, making it relatively cumbersome to use. Utility Model Content

[0003] The main technical problem to be solved by this utility model is to provide a mains power conversion circuit that can realize four waveforms—full wave, positive half wave, negative half wave, and no output—through a simple structure. It is simple, reliable, and low in cost.

[0004] Another major technical problem to be solved by this utility model is to provide an LED control circuit that controls the LED light by using different output waveforms of the mains power conversion circuit.

[0005] To solve the above-mentioned technical problems, this utility model provides a mains power conversion circuit, including a first diode, a second diode, a first switch, and a second switch;

[0006] The first diode and the second diode are connected in series on the L line of the mains power, and the cathode of the first diode is connected to the cathode of the second diode; the first switch and the second switch are connected in parallel with the first diode and the second diode, respectively.

[0007] This utility model also provides an LED control circuit, which uses the mains power conversion circuit as described above. The control circuit detects the output waveform of the mains power conversion circuit and controls the LED to switch to the corresponding light emission mode.

[0008] In a preferred embodiment: when the first switch and the second switch are respectively turned off, the mains power conversion circuit has no output and the LED light is turned off.

[0009] In a preferred embodiment: when the first switch and the second switch are closed respectively, the mains power conversion circuit outputs a sine wave, and the LED light is lit up with a first brightness.

[0010] In a preferred embodiment: when the first switch is open and the second switch is closed, the mains power conversion circuit outputs a positive half-wave, and the LED lights up at the second brightness.

[0011] In a preferred embodiment: when the second switch is open and the first switch is closed, the mains power conversion circuit outputs a negative half-wave, and the LED lights up at a third brightness.

[0012] This invention also provides an LED light, which uses the LED control circuit described above.

[0013] Compared with the prior art, the technical solution of this utility model has the following beneficial effects:

[0014] This invention provides an LED control circuit that utilizes two diodes and two switches to achieve full-wave, half-wave, and switching functions. The circuit is simple, reliable, and low-cost. Furthermore, it employs a segmented dimming method; after adjusting the first and second switches, the LED light will illuminate at a predetermined brightness or color temperature without further user adjustment, making it convenient and user-friendly. Attached Figure Description

[0015] Figure 1 This is a circuit diagram of the mains power conversion according to a preferred embodiment of the present invention. Detailed Implementation

[0016] To make the technical solution and features of this utility model clearer, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific examples. It should be understood that these examples are only for illustrating this utility model and are not intended to limit the scope of this utility model. After reading this utility model, any modifications of this utility model by those skilled in the art in various equivalent forms fall within the scope defined by the appended claims.

[0017] refer to Figure 1 This embodiment provides an LED lamp, including an LED light source board and an LED control circuit. The LED control circuit controls the light emission mode of the LED light source board, such as color temperature or brightness. This embodiment takes changing the brightness of the LED light source board as an example.

[0018] In this embodiment, the LED control circuit controls the LED light by detecting the different output waveforms of the mains power conversion circuit.

[0019] The mains power conversion circuit includes a first diode D1, a second diode D2, a first switch K1, and a second switch K2;

[0020] The first diode D1 and the second diode D2 are connected in series on the L line of the mains power, and the cathode of the first diode D1 is connected to the cathode of the second diode D2; the first switch K1 and the second switch K2 are connected in parallel with the first diode D1 and the second diode D2, respectively.

[0021] After the above settings are configured, when the first switch K1 and the second switch K2 are respectively turned off, the first diode D1 and the second diode D2 are turned off in turn, the mains power conversion circuit has no output, and the LED light is turned off.

[0022] When the first switch K1 and the second switch K2 are closed respectively, the first diode D1 and the second diode D2 are short-circuited respectively, the mains power conversion circuit outputs a sine wave, and the LED lights up at a first brightness, which can be 100% brightness or other preset brightness.

[0023] When the first switch K1 is open and the second switch K2 is closed, the mains power conversion circuit outputs a positive half-wave, and the LED light is lit at a second brightness. The second brightness can be 50% brightness or other preset brightness, as long as it is different from the first brightness.

[0024] When the second switch K2 is open and the first switch K1 is closed, the mains power conversion circuit outputs a negative half-wave, and the LED lights up at a third brightness. The third brightness can be 25% brightness or other preset brightness, as long as it is different from the first brightness and the second brightness.

[0025] The above is only one specific embodiment of the present utility model, but the design concept of the present utility model is not limited thereto. Any non-substantial modifications made to the present utility model using this concept shall be deemed as an infringement of the protection scope of the present utility model.

Claims

1. A mains power conversion circuit, characterized in that... Includes a first diode, a second diode, a first switch, and a second switch; The first diode and the second diode are connected in series on the L line of the mains power, and the cathode of the first diode is connected to the cathode of the second diode; the first switch and the second switch are connected in parallel with the first diode and the second diode, respectively.

2. An LED control circuit, characterized in that... The mains power conversion circuit of claim 1 is used, and the control circuit controls the LED to switch to the corresponding light emission mode by detecting the output waveform of the mains power conversion circuit.

3. The LED control circuit according to claim 2, characterized in that: When the first and second switches are respectively turned off, the mains power conversion circuit has no output and the LED light goes out.

4. The LED control circuit according to claim 2, characterized in that: When the first switch and the second switch are closed respectively, the mains power conversion circuit outputs a sine wave, and the LED light is lit up at the first brightness.

5. The LED control circuit according to claim 2, characterized in that: When the first switch is open and the second switch is closed, the mains power conversion circuit outputs a positive half-wave, and the LED lights up at the second brightness.

6. The LED control circuit according to claim 2, characterized in that: When the second switch is open and the first switch is closed, the mains power conversion circuit outputs a negative half-wave, and the LED lights up at the third brightness level.

7. An LED light, characterized in that... The LED control circuit according to any one of claims 2-6 is used.

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