Non-isolated dimming constant-current power supply and control system

A technology of power control and constant current power supply, applied in the field of lighting, can solve the problems that the noise cannot be fundamentally eliminated, the load light source board is ignited and burned, etc.

Pending Publication Date: 2019-03-01
OPPLE LIGHTING +1
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  • Claims
  • Application Information

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Problems solved by technology

Since the PWM dimming frequency is within the range that can be perceived by the human ear, the vibration and sound of the transformer is also within the range of the human ear. Usually, transformer impregnation and glue dispensing are used to eliminate noise. This method can only reduce noise. But the noise cannot b

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  • Non-isolated dimming constant-current power supply and control system
  • Non-isolated dimming constant-current power supply and control system
  • Non-isolated dimming constant-current power supply and control system

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Embodiment Construction

[0048] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0049] In order to solve the above technical problems, an embodiment of the present invention provides a non-isolated dimming constant current power supply. figure 1 A schematic structural diagram of a non-isolated dimming constant current power supply according to an embodiment of the present invention is shown. see figure 1 , the non-isolated dimming constant current power supply includes a micro control unit MCU, a micro contro...

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Abstract

The invention provides a non-isolated dimming constant-current power supply. The power supply comprises a power supply control IC, a micro control unit MCU and a transformer, wherein the micro controlunit MCU receives a dimming control signal from a user, analyzes dimming power corresponding to the dimming control signal, generates a linear dimming mode control signal if the dimming power is greater than preset power, and generates an interrupted mode control signal if the dimming power is smaller than the preset power; and the power control IC converts a received PWM signal into a linear voltage signal and adjusts the size of output current Io of a load LED by utilizing the linear voltage signal when working in a linear dimming mode, and generates a frequency signal in a preset range according to the received PWM signal, providing the frequency signal to the transformer and adjusting the size of the output current Io of the load LED by utilizing the received PWM signal when working in an interrupted mode. According to the non-isolated dimming constant-current power supply, a linear dimming manner and an interrupted dimming manner are combined to effectively eliminate the noises,which can be sensed by ears, generated by the transformer in the constant-current power supply.

Description

technical field [0001] The invention relates to the field of lighting technology, in particular to a non-isolated dimming constant current power supply and a control system. Background technique [0002] With the continuous development of lighting technology, people's requirements for lighting are getting higher and higher. At present, in order to increase the dimming depth, PWM (Pulse Width Modulation, pulse width modulation) dimming is usually used. When the PWM is high, the power loop of the circuit works, and when the PWM is low, the power loop of the circuit stops working. Since the PWM dimming frequency is within the range that can be perceived by the human ear, the vibration and sound of the transformer is also within the range of the human ear. Usually, transformer impregnation and glue dispensing are used to eliminate noise. This method can only reduce noise. But the noise cannot be eliminated fundamentally, and the human ear can still hear the sound from the power...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/00Y02B20/30
Inventor 周明兴吕保证
Owner OPPLE LIGHTING
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