CN204231727U - Light-adjusting module, electronic ballast for modulating fluorescent lamp and LED dimming power source - Google Patents

Abstract

The utility model discloses a dimming module, a fluorescent lamp dimming electronic ballast and an LED lamp dimming power supply. The dimming module includes a voltage detection circuit, a single-chip microcomputer and a PWM signal drive circuit, which are cascade-connected before and after to detect the power supply voltage of the lamp power supply main circuit; Set the corresponding relationship between the PWM output signal and the monitored power supply voltage change, and send the corresponding PWM control signal to the PWM signal driving circuit through the PWM signal output terminal. The dimming control of fluorescent lamps or LED lamps can be realized by using this dimming module together with electronic ballasts for fluorescent lamps or LED inverter drive power supplies, and then combining to adjust the power supply voltage. The utility model has the advantages of simple structure, safety and reliability, and is suitable for the popularization and application of lighting energy saving.

Description

Dimming module, fluorescent lamp dimming electronic ballast and LED lamp dimming power supply

technical field

The utility model relates to the field of lighting control, in particular to a dimming module, a fluorescent lamp dimming electronic ballast and an LED lamp dimming power supply.

Background technique

Fluorescent lamps and LED lamps are very common lighting terminal light sources on the market. When working, fluorescent lamps need to be equipped with electronic ballasts, which are used to convert the power-frequency AC power provided by the grid into high-frequency AC power required for fluorescent lamps to emit light after rectification and inversion; while LED lamps also need to be equipped with LED inverter drive power , used to convert the AC power provided by the grid into the DC power required by the LED lights.

At present, the functions of fluorescent lamps and LED lamps on the market are relatively single, and usually do not have a dimming function. Occasionally, there are scattered technical solutions for dimming fluorescent lamps: for example, the Chinese invention patent document with the publication number CN101646296A, which uses power carrier for communication control. The disadvantage is that the equipment is relatively complicated and the quality of the control signal cannot be guaranteed. At the same time, electronic ballasts and fluorescent lamps work at full power for a long time, which also affects the life of electronic ballasts and lamps. In addition, because LEDs require constant current power supply, otherwise they are prone to aging and damage, so it is impossible to adjust the light in the conventional way of directly adjusting the voltage at both ends of the lamp. According to the market survey, the existing LEDs usually still work with constant power output, that is, constant brightness.

Contents of the invention

The purpose of the utility model is to provide a simple structure, safe and reliable dimming module, a fluorescent lamp dimming electronic ballast and an LED lamp dimming power supply which are convenient for realizing lighting dimming.

The specific plan is as follows:

1. Dimming module: including a voltage detection circuit, a single-chip microcomputer and a PWM signal drive circuit, which are provided with front and back cascade connections to detect the power supply voltage of the lamp power supply main circuit; the signal output terminal of the voltage detection circuit is connected to the single-chip An I/O port or an A/D signal receiving port is connected; the single-chip microcomputer is provided with a PWM signal output terminal connected to the input terminal of the PWM signal drive circuit, which is used to preset according to the detected power supply voltage change The corresponding relationship between the PWM output signal and the monitored power supply voltage change parameter is used to send a corresponding PWM control signal to the PWM signal drive circuit through the PWM signal output terminal. The change of the power supply voltage may refer to the change of the specific voltage value or the change of the voltage waveform. The specific reference parameters include but not limited to the voltage fluctuation amplitude, the voltage fluctuation duration, the voltage change frequency, The time interval between voltage fluctuations, etc. The corresponding relationship between the PWM output signal and the monitored power supply voltage change can be pre-stored in the system in the form of a built-in data table according to the basic common sense in the computer field, or can be calculated by a relevant formula or obtained by a person skilled in the art Well-known other forms for design.

The dimming module can be used for dimming fluorescent lamps and LED lamps. When in use, the dimming module can be used in conjunction with an electronic ballast for fluorescent lamps or an LED inverter drive power supply, and combined to adjust the power supply voltage, the dimming control of fluorescent lamps or LED lamps can be realized.

2. Dimming electronic ballast for fluorescent lamps: it includes an input stage filter circuit, a rectifier circuit, and a bridge inverter circuit connected in front and back. connected; also includes the dimming module mentioned above; the control signal output terminal of the PWM signal driving circuit of the dimming module is connected with the power control input terminal of the bridge inverter circuit.

3. Dimming power supply for LED lamps: including an LED inverter drive power supply with a current negative feedback loop, and a dimming module as described above; the control signal output terminal of the PWM signal driving circuit of the dimming module is connected to the The current negative feedback loop is connected.

It can be seen from the above that although the dimming control of the dimming module of the utility model, the dimming electronic ballast for fluorescent lamps and the dimming power supply for LED lamps to the lighting terminal light source is borrowed from the form of adjusting the power supply voltage, it does not directly adjust the two sides of the terminal light source. Instead, the change of the power supply voltage is used as the control command to start the dimming work, and the PWM control signal is output by the dimming module, and finally by adjusting the output frequency of the electronic ballast and the LED inverter Drive the output current of the power supply to realize lighting dimming. Therefore, although the technical solution of the utility model is simple, it is safe and reliable; if it is used for new construction, expansion, reconstruction and upgrading of existing road and public lighting systems, since the dimming control is performed by adjusting the power supply voltage, the dimming input The control signal can be provided locally, so there is no need to add additional control signal wires, which can greatly save or even avoid the construction cost of re-wiring/embedding wires. While facilitating remote dimming, it can also avoid signal interference that may be caused by long-distance wiring , so it can show its advantages even more.

Description of drawings

Fig. 1 is a schematic diagram of circuit composition principles of an embodiment of a fluorescent lamp lighting system using a dimming module of the present invention and a fluorescent lamp dimming electronic ballast.

Fig. 2 is a schematic diagram of the circuit composition principle of an embodiment of the LED lamp lighting system using the dimming module and the LED lamp dimming power supply of the utility model.

Detailed ways

The intelligent lighting integrated system of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is a schematic diagram of circuit composition principles of an embodiment of a fluorescent lamp lighting system using a dimming module of the present invention and a fluorescent lamp dimming electronic ballast. Fig. 2 is a schematic diagram of the circuit composition principle of an embodiment of the LED lamp lighting system using the dimming module and the LED lamp dimming power supply of the utility model. As shown in the small virtual frame in Figures 1 and 2, the dimming module of the present invention includes a voltage detection circuit, a single-chip microcomputer and a PWM signal drive circuit that are provided with cascade connections to detect the power supply voltage of the lamp power supply main circuit; The signal output end of the voltage detection circuit is connected to one of the I/O ports or the A/D signal receiving port of the single-chip microcomputer; the single-chip microcomputer is provided with a PWM signal output end connected to the input end of the PWM signal drive circuit, and According to the detected change of the power supply voltage, according to the corresponding relationship between the PWM output signal preset by the system and the monitored change of the power supply voltage, the corresponding PWM control is sent to the PWM signal drive circuit through the PWM signal output terminal Signal.

The circuit composition principle of the electronic ballast for dimming the fluorescent lamp of the utility model is shown in the large virtual frame in Fig. 1 . As shown in the figure, the fluorescent lamp dimming electronic ballast of the present invention includes an input stage filter circuit, a rectifier circuit, and a bridge inverter circuit cascaded before and after, and the output end of the bridge inverter circuit is connected in series with a current-limiting inductor (Fig. (omitted) and then connected to the filament of the lamp; the utility model fluorescent lamp dimming electronic ballast also includes a dimming module shown in a small virtual frame; the control signal output terminal of the PWM signal driving circuit of the dimming module is connected to the The power control input terminals of the bridge inverter circuit are connected.

The circuit composition principle of the LED lamp dimming power supply of the utility model is shown in the large virtual frame in Fig. 2 . As shown in the figure, the utility model LED light dimming power supply is mainly composed of a dimming module and an LED inverter drive power supply shown in the small virtual frame. The specific design of the LED inverter drive power supply belongs to the prior art, wherein a current negative feedback loop is provided. The control signal output terminal of the PWM signal driving circuit of the dimming module is connected to the current negative feedback loop, and the dimming of the LED lamp is realized by adjusting the parameters of the current negative feedback loop to change the current output to the LED lamp Purpose.

The above contents are only examples of some preferred implementation modes of the present utility model, and cannot be regarded as limiting the implementation forms of the present utility model. All equivalent changes and improvements that can be made by those skilled in the art according to the technical solution of the utility model shall fall within the coverage of the technical solution of the utility model.

Claims (3)

1. The dimming module is characterized in that: it includes a voltage detection circuit, a single-chip microcomputer and a PWM signal drive circuit that are provided with front and back cascade connections to detect the power supply voltage of the lamp power supply main circuit; the signal output terminal of the voltage detection circuit is connected to the One of the I/O ports or the A/D signal receiving port of the single chip microcomputer is connected; According to the corresponding relationship between the PWM output signal preset by the system and the monitored power supply voltage change parameter, a corresponding PWM control signal is sent to the PWM signal driving circuit through the PWM signal output terminal. 2. The dimming electronic ballast for fluorescent lamps is characterized in that it includes an input stage filter circuit, a rectifier circuit, and a bridge inverter circuit connected in front and back cascades, and the output end of the bridge inverter circuit is connected in series with a current-limiting inductor It is connected with the filament of the lamp; it also includes the dimming module according to claim 1; the control signal output terminal of the PWM signal driving circuit of the dimming module is connected with the power control input terminal of the bridge inverter circuit. 3. LED lamp dimming power supply, it is characterized in that: comprise the LED inverter driving power supply that is provided with current negative feedback loop, and dimming module as claimed in claim 1; The PWM signal driving circuit of described dimming module The control signal output terminal is connected with the current negative feedback loop.