JP-7855046-B2 - Lighting device with adaptive load voltage control function

JP7855046B2JP 7855046 B2JP7855046 B2JP 7855046B2JP-7855046-B2

Inventors

盧福星
林智栄

Assignees

厦門普為光電科技有限公司

Dates

Publication Date: 20260507
Application Date: 20241011
Priority Date: 20231201

Claims (7)

Dimming module and A control module that saves a lookup table and is connected to the dimming module, A rectifier module connected to the dimming module and the control module, which generates a rectified voltage for driving the dimming module and the control module, The dimming module and the light-emitting module connected to the control module, Includes, The control module outputs an initial dimming signal to control the dimming module, outputs an initial drive signal to drive the light-emitting module, detects the current operating voltage of the light-emitting module, compares the current operating voltage with the lookup table, generates a corresponding target dimming signal, controls the dimming module to generate a target drive signal, and drives the light-emitting module . The dimming module includes an output voltage extraction unit, which converts the output voltage of the dimming module to a reference voltage according to a preset conversion ratio. The system further includes a load voltage detection module, the load voltage detection module receiving the reference voltage and transmitting it to the control module, The lighting device is equipped with an adaptive output power control function, characterized in that the control module includes a voltage divider detection unit, the voltage divider detection unit receives the reference voltage and converts the reference voltage into a feedback signal according to a preset voltage divider ratio, the control module compares the feedback signal with the lookup table to estimate the output voltage of the dimming module, generates an estimated voltage, forms the target dimming signal according to the estimated voltage, and keeps the output power of the light-emitting module constant .
The lighting device equipped with an adaptive output power control function according to claim 1 , characterized in that the lookup table lists the preset conversion ratio and the preset voltage division ratio.
The lighting device equipped with an adaptive output power control function according to claim 1 , characterized in that the output voltage extraction unit is a transformer.
The lighting device equipped with an adaptive output power control function according to claim 1, characterized in that the control module periodically generates the target dimming signal, controls the dimming module to generate a target drive signal, and drives the light-emitting module.
The lighting device with adaptive output power control function according to claim 1, further comprising an external power supply and a filter module connected to the rectifier module.
A lighting device with adaptive output power control function according to claim 1, further comprising a power factor correction module, wherein the rectifier module is connected to the dimming module via the power factor correction module.
A lighting device with adaptive output power control function according to claim 1, further comprising a power supply module, wherein the rectifier module is connected to the control module via the power supply module.

Description

This invention relates to a lighting device, and more particularly to a lighting device equipped with an adaptive load voltage control function. Conventional power supplies for LED lighting devices primarily consist of constant voltage and constant current sources. However, these two conventional power supplies can cause a series of problems in applications. When the power supply for a lighting device is a constant current source and the voltage of the LED (load) changes, the output power of the lighting device may also change, potentially leading to overload and failure of the lighting device. Furthermore, manufacturing tolerances can cause LEDs of the same model number to have different power outputs, which can also cause the above problems. When the power supply for a lighting device is a constant voltage source and the voltage of the LED (load) fluctuates significantly, the LED may fail to start or become overcurrentd, potentially leading to failure of the lighting device. Chinese Patent Application Publication No. 103874296 and Chinese Utility Model No. 206077764 both disclose circuit designs for lighting devices, but they still fail to effectively solve the problems of the prior art. Chinese Patent Application Publication No. 103874296 SpecificationChina Utility Model No. 206077764 This is a block diagram of the circuit of a lighting device equipped with an adaptive output power control function according to the first embodiment of the present invention.This is a first explanatory diagram of the operating state of a lighting device equipped with an adaptive output power control function according to the first embodiment of the present invention.This is a second explanatory diagram of the operating state of a lighting device equipped with an adaptive output power control function according to the first embodiment of the present invention.This is a circuit diagram of a dimming module and a load voltage detection module for a lighting device equipped with an adaptive output power control function according to a second embodiment of the present invention.This is a circuit diagram of a control module for a lighting device equipped with an adaptive output power control function according to a second embodiment of the present invention.This is a voltage/current curve diagram of a lighting device equipped with an adaptive output power control function according to a second embodiment of the present invention. The following embodiments describe the detailed features and advantages of the present invention, which are sufficient to enable those skilled in the art to understand and implement the technical aspects of the invention, and which, through the disclosures, claims, and drawings herein, will be readily understood by those skilled in the art. The following describes embodiments of the lighting device with adaptive output power control function of the present invention, with reference to the relevant drawings. For clarity and ease of illustration, the dimensions and proportions of components in the drawings may be exaggerated or reduced. In the following description and/or claims, when a component is described as "connected" or "joined" to another component, it may be a direct connection or coupling, or there may be an intermediary component. When a component is described as "directly connected" or "directly coupled" to another component, there is no intermediary component, and other terms used to describe relationships between components or layers should be interpreted similarly. For ease of understanding, the same components in the following embodiments are denoted by the same reference numerals. Figure 1 is a block diagram of the circuit of a lighting device equipped with an adaptive output power control function according to a first embodiment of the present invention. As shown in the figure, the lighting device 1 includes a filter module 11, a rectifier module 12, a power factor correction module 13, a dimming module 14, a light-emitting module 15, a power supply module 16, a control module 17, a module 17, and a load voltage detection module 18. The filter module 11 is connected to an external power supply and receives the input voltage Vp of the external power supply to generate a filtered voltage. In one embodiment, the filter module 11 may include one or more of the following: a filter circuit, an electromagnetic interference (EMI) prevention circuit, a thermistor, and a varistor. The circuit configuration of the filter module 11 is well known to those skilled in the art and will not be described in detail here. The rectifier module 12 is connected to the filter module 11, receives the filtered voltage, and generates a rectified voltage. In one embodiment, the rectifier module 12 may be a full-wave rectifier. In another embodiment, the rectifier module 12 may be a half-wave rectifier or other similar component. The circuit structure of the rectifier module 12 is well known to those skilled in the a