阅读说明：本技术 一种照明电路、照明灯具及可控硅调光器接入检测方法 (Lighting circuit, lighting lamp and silicon controlled dimmer access detection method ) 是由 刘雪 贺玉婷 刘鸿飞 于 2020-05-22 设计创作，主要内容包括：本发明公开了一种照明电路、照明灯具及可控硅调光器接入检测方法,包括可控硅检测电路、整流电路、泄放电路、照明驱动器及光源；接入交流电后,由所述可控硅检测电路采集输入电压,根据输入电压检测是否有可控硅调光器接入,并输出控制信号；再由所述泄放电路根据控制信号控制泄放电流的通断；由所述整流电路交流输入信号整流为一个幅值为正的电压信号传为光源供电；由所述照明驱动器驱动光源。本发明由可控硅检测电路采集输入电压,并根据输入电压检测是否有可控硅调光器接入,并根据检测结果控制控制泄放电流的通断,在实现判断可控硅调光器是否接入的功能的同时,减小了电量损耗。(The invention discloses a lighting circuit, a lighting lamp and a method for detecting the access of a silicon controlled rectifier dimmer, comprising a silicon controlled rectifier detection circuit, a rectifying circuit, a bleeder circuit, a lighting driver and a light source; after the alternating current is connected, the silicon controlled rectifier detection circuit collects input voltage, detects whether a silicon controlled rectifier dimmer is connected according to the input voltage, and outputs a control signal; the on-off of the bleeder current is controlled by the bleeder circuit according to the control signal; rectifying the alternating current input signal of the rectifying circuit into a voltage signal with positive amplitude and transmitting the voltage signal to a light source for supplying power; a light source is driven by the illumination driver. The invention collects the input voltage by the silicon controlled rectifier detection circuit, detects whether the silicon controlled rectifier dimmer is connected according to the input voltage, and controls the on-off of the discharge current according to the detection result, thereby reducing the electric quantity loss while realizing the function of judging whether the silicon controlled rectifier dimmer is connected.)

1. A lighting circuit is characterized by comprising a silicon controlled rectifier detection circuit, a rectifying circuit, a bleeder circuit, a lighting driver and a light source; after the alternating current is connected, the silicon controlled rectifier detection circuit collects input voltage, detects whether a silicon controlled rectifier dimmer is connected according to the input voltage, and outputs a control signal; the on-off of the bleeder current is controlled by the bleeder circuit according to the control signal; rectifying the alternating current input signal of the rectifying circuit into a voltage signal with positive amplitude and transmitting the voltage signal to a light source for supplying power; a light source is driven by the illumination driver.

2. The lighting circuit of claim 1, wherein the thyristor detection circuit comprises an input signal sampling circuit, and the input signal sampling circuit converts an alternating voltage with a certain frequency into a low voltage detection signal with the same frequency.

3. The lighting circuit of claim 2, wherein the thyristor detection circuit further comprises an FFT conversion circuit, and wherein the FFT conversion circuit performs a fast fourier transform on the low voltage detection signal to convert the time domain signal to a frequency domain signal.

4. The lighting circuit of claim 3, wherein the thyristor detection circuit further comprises a band-pass filter, the band-pass filter filters out signals of other frequency components, and the signals with the frequency 3 times that of the alternating voltage are filtered out and output to the bleeder circuit.

5. The lighting circuit of claim 1, wherein the rectifying circuit comprises a rectifying bridge, wherein the rectifying bridge rectifies the chopped ac input signal into a voltage signal having a positive amplitude for powering the light source.

6. A method for detecting the access of a silicon controlled dimmer is characterized by comprising the following steps:

collecting input voltage by a silicon controlled rectifier detection circuit, detecting whether a silicon controlled rectifier dimmer is connected according to the input voltage, and outputting a control signal;

the on-off of the bleeder current is controlled by the bleeder circuit according to the control signal;

the rectifying circuit rectifies the alternating current input signal into a voltage signal with positive amplitude and transmits the voltage signal to the light source for supplying power.

7. The triac dimmer access detection method of claim 6, wherein the step of collecting an input voltage from the triac detection circuit, detecting whether the triac dimmer is accessed according to the input voltage, and outputting the control signal comprises:

the input signal sampling circuit converts alternating voltage with a certain frequency into a low-voltage detection signal with the same frequency;

the FFT conversion circuit carries out fast Fourier transform on the low-voltage detection signal and converts a time domain signal into a frequency domain signal;

the band-pass filter filters out signals of other frequency components, and the signals with the frequency being 3 times of the frequency of the alternating voltage are filtered out and output to the bleeder circuit.

8. The triac dimmer access detection method of claim 7, wherein the step of controlling the on/off of the bleed current by the bleed circuit in response to the control signal comprises:

if the frequency of the control signal is 3 times of the frequency of the input voltage, the bleeder circuit conducts the bleeder current to the ground;

and if the control signal is zero, the bleeder circuit does not release the bleeder current.

9. A lighting fixture comprising a fixture body and a lighting circuit as recited in any one of claims 1-5, said lighting circuit being disposed within said fixture body.

Technical Field

The invention relates to the field of switching power supplies, in particular to a lighting circuit, a lighting lamp and a method for detecting access of a silicon controlled dimmer.

Background

In the indoor lighting application, the silicon controlled rectifier dimmer is a classic solution, and the silicon controlled rectifier dimmer has the advantages of simple structure, convenience in wiring, accordance with the use habits of users, high popularization rate and the like. The thyristor dimmer is designed for driving an incandescent lamp, so that the dimming performance of the thyristor dimmer is good when the lighting fixture is a resistive load. With the diversification and complication of lighting sources and the gradual fading of incandescent lamps out of historical stages, the matching of the thyristor dimmer and different lighting sources becomes a technical problem to be solved urgently.

The silicon controlled dimmer chops the alternating current commercial power by controlling the conduction and the closing of the silicon controlled rectifier in each power frequency period. When the thyristor dimmer is turned off, a certain load impedance is required to ensure the normal work of a circuit in the thyristor dimmer, and when the thyristor dimmer is turned on, a certain maintaining current is required to maintain the conduction of the thyristor. Therefore, when modern lighting sources are designed, in order to be compatible with the thyristor dimmer, a certain bleeder circuit needs to be designed to release a bleeder current, so as to ensure thyristor compatibility. However, this discharge current causes power loss and temperature rise, which reduce the lighting efficiency and waste the electric energy when the lighting source is connected to the lighting scene without the scr dimmer.

Thus, the prior art has yet to be improved and enhanced.

Disclosure of Invention

In view of the defects of the prior art, the invention aims to provide the lighting circuit, the lighting lamp and the thyristor dimmer access detection method.

In order to achieve the purpose, the invention adopts the following technical scheme:

a lighting circuit comprises a silicon controlled rectifier detection circuit, a rectification circuit, a bleeder circuit, a lighting driver and a light source; after the alternating current is connected, the silicon controlled rectifier detection circuit collects input voltage, detects whether a silicon controlled rectifier dimmer is connected according to the input voltage, and outputs a control signal; the on-off of the bleeder current is controlled by the bleeder circuit according to the control signal; rectifying the alternating current input signal of the rectifying circuit into a voltage signal with positive amplitude and transmitting the voltage signal to a light source for supplying power; a light source is driven by the illumination driver.

The silicon controlled rectifier detection circuit comprises an input signal sampling circuit, and alternating voltage with a certain frequency is converted into a low-voltage detection signal with the same frequency by the input signal sampling circuit.

The silicon controlled rectifier detection circuit also comprises an FFT conversion circuit, and the FFT conversion circuit carries out fast Fourier transform on the low-voltage detection signal and converts a time domain signal into a frequency domain signal.

The silicon controlled rectifier detection circuit further comprises a band-pass filter, the band-pass filter filters signals of other frequency components, the signals with the frequency being 3 times of the alternating voltage frequency are screened out, and the signals are output to the bleeder circuit.

The rectifying circuit comprises a rectifying bridge, and the rectifying bridge rectifies chopped alternating current input signals into a voltage signal with positive amplitude and transmits the voltage signal to the light source for power supply.

A method for detecting the access of a silicon controlled dimmer comprises the following steps:

collecting input voltage by a silicon controlled rectifier detection circuit, detecting whether a silicon controlled rectifier dimmer is connected according to the input voltage, and outputting a control signal;

the on-off of the bleeder current is controlled by the bleeder circuit according to the control signal;

the rectifying circuit rectifies the alternating current input signal into a voltage signal with positive amplitude and transmits the voltage signal to the light source for supplying power.

The method comprises the following steps of collecting input voltage by a silicon controlled rectifier detection circuit, detecting whether a silicon controlled rectifier dimmer is connected according to the input voltage, and outputting a control signal:

the input signal sampling circuit converts alternating voltage with a certain frequency into a low-voltage detection signal with the same frequency;

the FFT conversion circuit carries out fast Fourier transform on the low-voltage detection signal and converts a time domain signal into a frequency domain signal;

the band-pass filter filters out signals of other frequency components, and the signals with the frequency being 3 times of the frequency of the alternating voltage are filtered out and output to the bleeder circuit.

The step of controlling the on-off of the bleeder current by the bleeder circuit according to the control signal comprises:

if the frequency of the control signal is 3 times of the frequency of the input voltage, the bleeder circuit conducts the bleeder current to the ground;

and if the control signal is zero, the bleeder circuit does not release the bleeder current.

A lighting fixture comprising a fixture body and a lighting circuit as described above, the lighting circuit being disposed within the fixture body.

Compared with the prior art, the lighting circuit, the lighting lamp and the access detection method of the silicon controlled rectifier dimmer provided by the invention comprise a silicon controlled rectifier detection circuit, a rectifying circuit, a bleeder circuit, a lighting driver and a light source; after the alternating current is connected, the silicon controlled rectifier detection circuit collects input voltage, detects whether a silicon controlled rectifier dimmer is connected according to the input voltage, and outputs a control signal; the on-off of the bleeder current is controlled by the bleeder circuit according to the control signal; rectifying the alternating current input signal of the rectifying circuit into a voltage signal with positive amplitude and transmitting the voltage signal to a light source for supplying power; a light source is driven by the illumination driver. The invention collects the input voltage by the silicon controlled rectifier detection circuit, detects whether the silicon controlled rectifier dimmer is connected according to the input voltage, and controls the on-off of the discharge current according to the detection result, thereby reducing the electric quantity loss while realizing the function of judging whether the silicon controlled rectifier dimmer is connected.

Drawings

FIG. 1 is a functional block diagram of a lighting circuit according to the present invention;

FIG. 2 is a functional block diagram of the structure of the SCR detection circuit provided by the present invention;

FIG. 3 is a signal comparison diagram of the SCR detection circuit when the SCR dimmer is not accessed and is accessed according to the present invention;

fig. 4 is a flowchart of a thyristor dimmer access detection method provided by the present invention;

FIG. 5 is a flowchart of step S100 provided by the present invention;

fig. 6 is a flowchart of step S200 provided by the present invention.

Detailed Description

In view of the problems in the prior art, the invention provides a lighting circuit, a lighting lamp and a method for detecting the access of a silicon controlled rectifier dimmer.

The embodiments of the present invention are intended to explain technical concepts of the present invention, technical problems to be solved, technical features constituting technical solutions, and technical effects to be brought about in more detail. The embodiments are explained below, but the scope of the present invention is not limited thereto. Further, the technical features of the embodiments described below may be combined with each other as long as they do not conflict with each other.

In view of the problem of extra power loss caused by the fact that the bleeder current is also conducted when a triac-free dimmer is connected in the prior art, referring to fig. 1, the present invention provides an illumination circuit 100, which includes a triac detection circuit 104, a rectification circuit 103, a bleeder circuit 107, an illumination driver 105 and a light source 106; the rectifying circuit 103 and the thyristor detection circuit 104 are both connected to an L line and an N line of the mains 101, and when the thyristor dimmer 102 is arranged between the mains 101 and the lighting circuit 100, the rectifying circuit 103 and the thyristor detection circuit 104 receive a voltage chopped by the thyristor dimmer 102 (i.e., the input voltage is a chopped voltage); when the triac dimmer 102 is not disposed between the commercial power 101 and the lighting circuit 100, the input voltage received by the rectifying circuit 103 and the triac detecting circuit 104 is the voltage of the commercial power 101.