Commercial power conversion circuit, LED control circuit and LED lamp

Abstract

The invention provides a commercial power conversion circuit. The commercial power conversion circuit comprises 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 an L line of the commercial power, and the cathode of the first diode is connected to the cathode of the second diode; and the first switch and the second switch are respectively connected with the first diode and the second diode in parallel. The invention further provides an LED control circuit, the commercial power conversion circuit is used, and the control circuit detects the output waveform of the commercial power conversion circuit and controls the LED lamp to be switched to a corresponding light emitting mode. The invention further provides an LED lamp, and the LED lamp uses the LED control circuit.

Description

Technical Field

[0001] The present invention relates to a lighting device, and particularly to an LED lighting device. Background Art

[0002] Chinese Patent CN109275229A provides a dimming circuit for detecting an AC power supply waveform and its implementation method. By detecting the input waveform of the alternating current, dimming is performed. Compared with the traditional segment dimming, it has more dimming levels and simple operation, which is convenient for the elderly and children to use. However, its technical solution can only achieve three gears. That is, when K1 is switched to the first gear, the circuit is not conducting; when K1 is switched to the second gear, the output alternating current only has a positive half-cycle waveform, and the control unit MCU enters the gradual dimming. If there is no further operation, the brightness will cycle from 100% - 10% - 100%. When K1 is switched to the third gear, the brightness of the LED lamp will be fixed at a certain brightness and will no longer change. That is to say, the LED lamp in Comparative Document 1 only has three modes: full off, fixed at a certain brightness, and gradual dimming. Especially during gradual dimming, an additional operation is required to determine a brightness in the gradual dimming range for retention, otherwise it will continuously cycle through the gradual dimming, which is still relatively troublesome to use. Summary of the Invention

[0003] The main technical problem to be solved by the present invention is to provide a mains conversion circuit that realizes four waveforms: full wave, positive half wave, negative half wave, and no output through a simple structure, which is simple, reliable, and low-cost.

[0004] Another main technical problem to be solved by the present invention is to provide an LED control circuit that controls the LED lamp through different output waveforms of the mains conversion circuit.

[0005] To solve the above technical problems, the present invention provides a mains 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, and the cathode of the first diode is connected to the cathode of the second diode; the first switch and the second switch are respectively connected in parallel with the first diode and the second diode.

[0007] The present invention also provides an LED control circuit that uses the above-mentioned mains conversion circuit. The control circuit controls the LED lamp to switch to the corresponding light output mode by detecting the output waveform of the mains conversion circuit.

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

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

[0010] In a preferred embodiment, when the first switch is open and the second switch is closed, the mains conversion circuit outputs a positive half-wave, and the LED lamp is lit with a second brightness.

[0011] In a preferred embodiment, when the second switch is open and the first switch is closed, the mains conversion circuit outputs a negative half-wave, and the LED lamp is lit with a third brightness.

[0012] The present invention also provides an LED lamp that uses the above-mentioned LED control circuit.

[0013] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0014] The present invention provides an LED control circuit. By using two diodes and two switches, full-wave, half-wave, and switching functions can be realized. The circuit is simple and reliable, and the cost is low. And by adopting a segmented dimming method, after the user adjusts the first switch and the second switch, the LED lamp can be lit with a predetermined brightness or color temperature, and the user does not need to make further adjustments, which is relatively convenient and user-friendly to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the mains conversion circuit diagram of the preferred embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] In order to make the technical solution and features of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and specific examples. It should be understood that these examples are only used to illustrate the present invention and not to limit the scope of the present invention. After reading the present invention, those skilled in the art's various equivalent modifications of the present invention fall within the scope defined by the appended claims of this application.

[0017] Reference 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 output mode of the LED light source board, such as color temperature or brightness. In this embodiment, taking the change of the brightness of the LED light source board as an example.

[0018] The LED control circuit in this embodiment controls the LED lamp by detecting different output waveforms of the mains conversion circuit.

[0019] The mains 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 supply, 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 respectively connected in parallel with the first diode D1 and the second diode D2.

[0021] After the above settings, when the first switch K1 and the second switch K2 are respectively turned off, the first diode D1 and the second diode D2 are alternately cut off, and the mains power conversion circuit has no output, and the LED lamp goes out.

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

[0023] When the first switch K1 is turned off and the second switch K2 is closed, the mains power conversion circuit outputs a positive half-wave, and the LED lamp lights up with the second brightness, and 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 turned off and the first switch K1 is closed, the mains power conversion circuit outputs a negative half-wave, and the LED lamp lights up with the third brightness, and 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 a specific embodiment of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantive modification of the present invention using this concept belongs to the act of infringing the protection scope of the present invention.

Claims

1. A mains power conversion circuit, characterized in that It 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 supply, and the cathode of the first diode is connected to the cathode of the second diode; the first switch and the second switch are respectively connected in parallel with the first diode and the second diode.

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

3. The LED control circuit according to claim 2, wherein: When the first switch and the second switch are respectively turned off, the mains power conversion circuit has no output and the LED lamp is turned off.

4. An LED control circuit according to claim 2, characterized in that: When the first switch and the second switch are respectively closed, the mains power conversion circuit outputs a sine wave and the LED lamp lights up with the first brightness.

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

6. The LED control circuit according to claim 2, wherein: When the second switch is turned off and the first switch is closed, the mains power conversion circuit outputs a negative half-wave and the LED lamp lights up with the third brightness.

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

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