Light emitting diode control circuit and lighting device with same

Abstract

The invention provides a light-emitting diode control circuit and lighting equipment with the control circuit. The lighting equipment comprises the control circuit and a light-emitting module connected with the control circuit. The control circuit is used for being connected with alternating voltage and controlling the light emitting module to emit light, and the control circuit comprises a differential mode surge protection module and a common mode surge protection module. And the differential mode surge protection module is connected with the light-emitting module and is used for controlling the on and off of the light-emitting module and adjusting the brightness of the light-emitting module. The common-mode surge protection module is connected with the light-emitting module and used for detecting the on-state of the alternating-current voltage source within the preset time and adjusting the color temperature of the light-emitting module when it is detected that the alternating-current voltage source is on.

Description

Technical Field

[0001] The present invention relates to the field of lighting, and more particularly to a light-emitting diode (LED) control circuit capable of adjusting light brightness and color temperature, and a lighting device having the control circuit. Background Art

[0002] The lamps on the market today mainly include incandescent lamps, energy-saving lamps and LED lamps. Incandescent lamps have been losing market share year by year due to their short lifespan, poor stability and lighting comfort, and high power consumption. Energy-saving lamps contain heavy metals such as mercury, which cause serious environmental pollution when they are scrapped, affecting their wide-scale use.

[0003] LED lamps are equipped with control circuits and drive modules, which convert the mains electricity into voltage and current suitable for LED lamps to drive the LED lamps to emit light. This makes the cost of LED lamps relatively high, which affects their wide popularization.

[0004] Furthermore, the control circuit has only two states: on and off, making it difficult for LED lamps to achieve a dimmable state. Even if there are dimmable LED lamps, the dimming effect is poor and they usually only have on and off functions, which is difficult to meet user needs. LED lighting equipment is one of the necessities of modern life. Existing lighting equipment has relatively simple functions. Simple LED lighting usually only has on and off functions, which is difficult to meet user needs.

[0005] In addition, conventional LED lighting equipment can generally only control a certain color temperature in the LED lamp, that is, a single cold white light or a single warm white light. Some LEDs contain two colors of lamp beads, generally a cold white light lamp bead and a warm white light lamp bead. By directly powering a certain lamp bead, one color temperature can be presented. By switching the switch, two color temperatures can be presented. However, this simple switch switching method can only achieve the effect of two color temperatures, and the number of color temperature changes is limited. Summary of the invention

[0006] In view of this, it is necessary to provide an LED control circuit that has the functions of adjusting brightness and color temperature and can present multiple color temperature changes, and a lighting device having the control circuit.

[0007] This creation uses linear power supply, control module and LED lamp beads. LED lamps have the advantages of energy saving, environmental protection and long life and widely occupy a major position in the lighting market.

[0008] The invention provides a control circuit for connecting to an AC voltage source and controlling a light-emitting module to emit light.

[0009] This invention provides a control circuit, which is connected to the AC power grid through the ACL terminal and the ACN terminal, so as to directly drive the LED lamp to emit light through the AC power. The control circuit includes: differential mode, common mode surge protection module, rectifier filter circuit, strobe control circuit and overvoltage protection circuit, signal collection circuit, LED drive control circuit, communication isolation circuit and color temperature brightness processing circuit (including control main IC and auxiliary control sub-IC). The control main IC collects external electrical signals and gives them to the auxiliary control sub-IC after processing. The auxiliary control sub-IC is used to adjust the brightness and color temperature of the light-emitting module through the LED drive control circuit, and improve the compatibility of the control IC.

[0010] The signal acquisition module is used to detect the on state of the AC voltage source within a predetermined time, and when the AC voltage source is detected to be on, a signal is given to the control module; the control module (color temperature and brightness processing circuit module), which is connected to the light-emitting module, is used to control the on and off of the light-emitting module, and to adjust the brightness of the light-emitting module, as well as the color temperature of the light-emitting module.

[0011] On the other hand, the present invention provides a lighting device, which includes a light-emitting module and the above-mentioned control circuit connected to the light-emitting module.

[0012] The above-mentioned control circuit and the lighting equipment having the control circuit have the functions of adjusting brightness and color temperature, are rich in functions, and can detect the on state of the AC voltage source for the acquisition signal module through the primary and secondary IC mode control modules to control the color temperature change of the light-emitting module, thereby being able to present a variety of color temperature changes.

[0013] The invention provides a differential mode surge protection circuit and a common mode surge protection circuit. The differential mode surge protection circuit and the common mode surge protection circuit are arranged before the rectifier and filter circuit, and have strong surge protection capability, and the surge capability can reach AC3KV.

[0014] The beneficial effects brought by this creative technical solution include:

[0015] 1. LED lamps have the advantages of energy saving, environmental protection and long life, and widely occupy a major position in the lighting market.

[0016] 2. The control circuit of the present invention can be directly connected to the AC power grid to directly drive the LED lamp to emit light. In this way, the driving power supply can be removed from the LED lamp, reducing the manufacturing cost of the LED and reducing the size of the LED lamp. In addition, the control circuit of the present invention realizes dimming control through a multi-stage control method by setting a control unit and an auxiliary control unit, thereby improving the dimming effect. The low-frequency flicker control unit further reduces the flicker rate of the LED lamp and reduces the damage to the human eye caused by the LED lamp.

[0017] 3. This invention provides a control circuit that can achieve good dimming effect, low flicker and low cost for LED lamps. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 : Functional module diagram of the lighting equipment of the first preferred embodiment of the present invention.

[0019] Figure 2 : Figure 1 The circuit diagram of the lighting device shown in .

[0020] Figure 3 : A partial circuit diagram of the lighting device of the second preferred embodiment of the present invention. DETAILED DESCRIPTION

[0021] See also Figure 1 , is a functional module diagram of a lighting device 300 of the first preferred embodiment of the present invention. The lighting device 300 includes a control circuit 100 and a light-emitting module 500 connected to the control circuit 100. In the present embodiment, the control circuit 100 is used to connect an AC voltage and control the light-emitting module 500 to emit light. The control circuit 100 includes: a differential-mode surge protection module 10 and a common-mode surge protection module 20. The differential-mode surge protection module 10 is connected to the light-emitting module 500, and is used to control the on and off of the light-emitting module 500, and to adjust the brightness of the light-emitting module 500. The common-mode surge protection module 20 is connected to the light-emitting module 500, and is used to detect the on state of the AC voltage source within a predetermined time, and when the AC voltage source is detected to be on, the color temperature of the light-emitting module 500 is adjusted.

[0022] Please also read Figure 2 The invention provides a control circuit 100, which is connected to the AC power grid through the ACL terminal and the ACN terminal, so as to directly drive the LED lamp to emit light through the AC power. The control circuit 100 includes: a differential mode surge protection module 10, a common mode surge protection module 20, a rectifier filter circuit 30, a strobe control circuit 40, an overvoltage protection circuit 50, a signal acquisition circuit 60, an LED drive control circuit 70, a communication isolation circuit 80, and a color temperature and brightness processing circuit 90 (including a control main IC and an auxiliary control sub-IC). The control main IC collects external electrical signals and processes them, and then gives them to the auxiliary control sub-IC. The auxiliary control sub-IC is used to adjust the brightness and color temperature of the light-emitting module 500 through the LED drive control circuit 70, and improve the compatibility of the control IC.

[0023] The signal collection module 60 is used to detect the on state of the AC voltage source within a predetermined time, and when detecting that the AC voltage source is on, a signal is given to the control circuit 100; the control circuit 100 includes a color temperature and brightness processing circuit 90, and the control circuit 100 is connected to the light emitting module 500, and is used to control the on and off of the light emitting module 500, and to adjust the brightness of the light emitting module 500, and also to adjust the color temperature of the light emitting module 500.

[0024] On the other hand, the present invention provides a lighting device 300 , which includes a light-emitting module 500 and the above-mentioned control circuit 100 connected to the light-emitting module 50 .

[0025] The control circuit 100 and the lighting device 300 having the control circuit 100 have both the functions of adjusting brightness and color temperature, and are rich in functions. The primary and secondary IC mode control circuit 100 can detect the on state of the AC voltage source for the signal collection circuit 60 to control the color temperature change of the light-emitting module 500, thereby presenting a variety of color temperature changes.

[0026] The invention also includes: a differential mode surge protection circuit 10 and a common mode surge protection circuit 20, which are arranged in front of the rectifier filter circuit 30, and have strong surge protection capability, and the surge capability can reach AC3KV. In this preferred embodiment, the control circuit 100 also includes a rectifier filter circuit 30, which is arranged between the AC voltage source and the differential mode surge protection module 10 and the common mode surge protection module 20, and is used to rectify and filter the AC voltage source, and output drive current to the differential mode surge protection module 10, the common mode surge protection module 20 and the light emitting module 500.

[0027] It can be understood that the control circuit 100 also includes a differential mode surge protection module 10 and a common mode surge protection module 20, which are arranged before the rectifier filter circuit 30 to prevent the control circuit 100 from being subjected to EMI electromagnetic interference and suppress lightning surges, providing transient and steady-state protection respectively.

[0028] It can be understood that the control circuit 100 further includes a strobe control circuit 40 , which is electrically connected between the differential mode surge protection module 10 and the light emitting module 500 . The strobe control circuit 40 is used to prevent the light emitting module 500 from generating strobe.

[0029] It can be understood that the control circuit 100 also includes an overvoltage protection circuit 50, which is connected between the AC voltage source and the differential-mode surge protection module 10 and the common-mode surge protection module 20, so that the AC voltage source provides a stable voltage input to the differential-mode surge protection module 10, the common-mode surge protection module 20 and the light-emitting module 500.

[0030] When the lighting device 300 is working, the differential mode surge protection module 10 is connected to the first terminal L and the second terminal N of the AC voltage source. After the AC voltage source is rectified and filtered by the rectifier and filter circuit 30 and stabilized by the overvoltage protection circuit 50, it is output to the differential mode surge protection module 10, the common mode surge protection module 20 and the light emitting module 500. The differential mode surge protection module 10 controls the light emitting module 500 to turn on through a switch unit. The brightness of the light emitting module 500 can be adjusted by adjusting the resistance value of a resistor. In addition, when the AC voltage source is disconnected, the differential mode surge protection module 10 controls the light emitting module 500 to turn off through the switch unit. The common mode surge protection module 20 detects the on state of the AC voltage source within a predetermined time, and adjusts the color temperature of the light emitting module 500 when the AC voltage source is detected to be on.

[0031] See also Figure 3 , which is a partial circuit diagram of a lighting device 600 of the second preferred embodiment of the present invention. The structure and working principle of the lighting device 600 are substantially the same as those of the lighting device 300. The control circuit 100 and the lighting devices 300 and 600 having the control circuit have both the function of adjusting brightness and color temperature, and are rich in functions. The common-mode surge protection module 20 can detect the on state of the AC voltage source and control the color temperature change of the light-emitting module 500, thereby presenting multiple color temperature changes.

[0032] The key points of this creative technical solution:

[0033] 1. The color temperature and brightness processing circuit 90 in the control circuit 100 of the present invention is composed of two ICs, and the two ICs are in a master-slave relationship;

[0034] 2. The control circuit 100 of the present invention has an overvoltage protection circuit 50, which is arranged between the LED drive control circuit 70 and the rectifier filter circuit 30;

[0035] 3. The control circuit 100 of the present invention has a communication isolation circuit 80, which is arranged between the LED drive control circuit 70 and the color temperature and brightness processing circuit 90;

[0036] 4. The control circuit 100 of the present invention has a signal collection circuit 60, which is arranged between the color temperature and brightness processing circuit 90 and the rectifier and filter circuit 30, and has multiple ways to collect information, and can be compatible with most thyristors; and 5. The control circuit 100 of the present invention has a differential mode surge protection circuit 10 and a common mode surge protection circuit 20, which are arranged before the rectifier and filter circuit 30, and have strong surge protection capabilities, and the surge capacity can reach AC3KV.

[0037] Without departing from the broad concept of the case, those skilled in the art can understand and make changes to the above embodiments. Therefore, the case is not limited to the specific embodiments disclosed in the specification, and all modifications made according to the spirit and technical scope of the case should be covered and protected by the text content defined in the scope of the patent application.

Claims

1. An LED control circuit and a lighting device having the control circuit, characterized in that: Used to connect to an AC voltage source and control the light-emitting module to emit light. The control circuit includes: A differential mode surge protection module, a common mode surge protection module, a rectifier filter circuit, a strobe control circuit, an overvoltage protection circuit, a signal collection circuit, an LED drive circuit, a communication isolation circuit and a color temperature and brightness processing circuit; the color temperature and brightness processing circuit has a control main IC and an auxiliary control sub-IC, the control main IC collects external electrical signals and gives them to the auxiliary control sub-IC after processing, and the auxiliary control sub-IC is used to adjust the brightness and color temperature of the light-emitting module through the LED drive circuit.

2. The LED control circuit as claimed in claim 1, characterized in that: The signal collection module is used to detect the on state of the AC voltage source within a predetermined time, and when the AC voltage source is detected to be on, a signal is given to the control module; the control module (color temperature and brightness processing circuit module), which is connected to the light-emitting module, is used to control the on and off of the light-emitting module, and to adjust the brightness of the light-emitting module, as well as the color temperature of the light-emitting module.

3. The LED control circuit as claimed in claim 1, characterized in that: The control circuit and the lighting device having the control circuit have the functions of adjusting brightness and color temperature, and can detect the on state of the AC voltage source for the signal collection module through the primary and secondary IC mode control modules, and control the color temperature change of the light-emitting module, thereby presenting a variety of color temperature changes.

4. The LED control circuit as claimed in claim 1, characterized in that: The differential mode surge protection circuit and the common mode surge protection circuit are arranged before the rectifier and filter circuit, and have strong surge protection capability.

5. The LED control circuit as claimed in claim 1, characterized in that: The overvoltage protection circuit is arranged between the LED driving control circuit and the rectifying and filtering circuit.

6. The LED control circuit as claimed in claim 1, characterized in that: The signal acquisition circuit is arranged between the color temperature and brightness processing circuit and the rectification and filtering circuit, and has multiple ways to collect information.

7. The LED control circuit as claimed in claim 1, characterized in that: The communication isolation circuit is arranged between the LED driving control circuit and the color temperature and brightness processing circuit.

8. A lighting device having the above control circuit, characterized in that: The lighting device comprises: a light emitting module; and The control circuit connected to the light emitting module.

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