CN111565501B - Lighting circuit, lighting lamp and silicon controlled dimmer access detection method - Google Patents
Lighting circuit, lighting lamp and silicon controlled dimmer access detection method Download PDFInfo
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- CN111565501B CN111565501B CN202010442812.7A CN202010442812A CN111565501B CN 111565501 B CN111565501 B CN 111565501B CN 202010442812 A CN202010442812 A CN 202010442812A CN 111565501 B CN111565501 B CN 111565501B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
- H05B47/105—Controlling the light source in response to determined parameters
- H05B47/14—Controlling the light source in response to determined parameters by determining electrical parameters of the light source
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
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.
Description
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 above disadvantages of the prior art, an object of the present invention is to provide a lighting circuit, a lighting fixture, and a method for detecting the access of a thyristor dimmer, in which a thyristor detection circuit collects an input voltage, and detects whether the thyristor dimmer is accessed according to the input voltage, and controls a bleeder circuit to control the on/off of a bleeder current according to a detection result, thereby reducing power consumption while realizing a function of determining whether the thyristor dimmer is accessed.
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.
In specific implementation, in this embodiment, the lighting circuit 100 is connected to the mains 101 (i.e., ac), the first input end of the thyristor detection circuit 104 is connected to the thyristor dimmer 102, the second input end of the thyristor detection circuit 104 is connected to the N-terminal of the mains, and the output end of the thyristor detection circuit 104 is connected to the input end of the bleeder circuit 107. After the alternating current is connected, the thyristor detection circuit 104 collects input voltage, detects whether the thyristor dimmer 102 is connected according to the input voltage, and outputs a control signal to the bleeder circuit 107; meanwhile, the bleeder circuit 107 controls the on/off of the bleeder current in the lighting circuit 100 according to the control signal. Specifically, when the triac dimmer 102 is connected, the triac detection circuit 104 outputs a first control signal, and the bleeder circuit 107 is turned on according to the first control signal to introduce a bleeder current in the lighting circuit 100 to the ground terminal, so as to maintain the normal operation of the triac dimmer 102; when the triac dimmer 102 is not connected to the circuit, the leakage circuit 107 cuts off the leakage current, so that a loop cannot be formed, and additional power consumption under the condition of no triac dimmer 102 is avoided. The rectifying circuit 103 rectifies an alternating current input signal into a voltage signal with positive amplitude, and transmits the voltage signal to the light source 106 for power supply.
Further, the rectifier circuit 103 includes a rectifier bridge, which rectifies the chopped ac input signal into a voltage signal with positive amplitude and transmits the voltage signal to the light source 106 for power supply; and drives the light source 106 through the illumination driver 105. This is prior art and will not be described in detail herein.
Further, referring to fig. 2 and fig. 3, the scr detecting circuit 104 includes an input signal sampling circuit 201, an FFT converting circuit 202, and a band pass filter 203. Specifically, a first input end of the input signal sampling circuit 201 collects an input voltage; when the triac dimmer 102 is connected, the input voltage Vac1 is an ac voltage obtained by chopping the voltage of the ac mains 101, and the input voltage is converted into a low-voltage detection Signal1 by the input Signal sampling circuit 201, where the low-voltage detection Signal1 is obtained by scaling down the input voltage Vac1, so that the frequency of the low-voltage detection Signal1 is the same as the frequency of the input voltage Vac1, and the frequency of the low-voltage detection Signal1 is denoted as f in this embodiment. The low voltage detection Signal1 is fast fourier transformed by the FFT circuit 202 to generate a frequency domain Signal 2. The frequency domain Signal2 is filtered by the band pass filter 203 to obtain a control Signal3 (denoted as a first control Signal), and the control Signal is transmitted to the bleeding circuit 107. When the thyristor is turned on, the low voltage detection Signal1 makes an upward jump with a large slope, so that the frequency domain Signal2 obtained after the fast fourier transform contains not only signals with the frequency f but also signals with the frequencies 3f, 5f and the like. Since the passband of the bandpass filter 203 allows only the Signal having the frequency of 3f to pass therethrough and filters out the signals having other frequency components, the control Signal3 is a Signal having the frequency of 3f and the amplitude thereof is equal to the input voltage. At this time, the bleeding circuit 107 receives the control signal and conducts the bleeding current to the ground terminal to maintain the normal operation of the triac dimmer 102.
When the triac-free dimmer 102 is connected, the input voltage Vac1 is the voltage of the ac mains 101 and is a sine wave Signal, and the low-voltage detection Signal1 is obtained by scaling down the input voltage Vac1, so the low-voltage detection Signal1 is a sine wave Signal with a low voltage, and has the same frequency as the input voltage Vac1, and the frequency of the low-voltage detection Signal1 in this embodiment is f. The low voltage detection Signal1 is fast fourier transformed by the FFT circuit 202 to generate a frequency domain Signal 2. The frequency domain Signal2 is filtered by the band-pass filter 203 to obtain a control Signal3 (denoted as a second control Signal), and the control Signal is transmitted to the bleeding circuit 107. Since the Signal1 is a sine wave Signal having a frequency f, the frequency domain Signal2 obtained after the fast fourier transform contains only a Signal having a frequency f. The passband of bandpass filter 203 allows only signals with frequency 3f to pass through, and signals with frequency f are filtered out, so control Signal3 is zero (i.e., the voltage is 0V). At this time, the leakage circuit 107 is connected to the voltage of 0V, so that the leakage current is not conducted to the ground, thereby avoiding extra power consumption caused by the loop formed under the situation without the triac dimmer 102. It should be noted that, the input signal sampling circuit 201, the FFT conversion circuit 202, and the band pass filter 203 in this embodiment all use the existing circuits, and only the corresponding functions of this embodiment need to be satisfied, which is not described in detail herein.
Based on the lighting circuit, please refer to fig. 4, the invention further provides a method for detecting the access of the thyristor dimmer, which comprises the following steps:
s100, 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;
s200, controlling the on-off of the leakage current by the leakage circuit according to the control signal;
s300, rectifying the alternating current input signal into a voltage signal with positive amplitude by a rectifying circuit, and transmitting the voltage signal to a light source for supplying power.
In specific implementation, in this embodiment, after the ac power is supplied, the thyristor detection circuit 104 collects an input voltage, detects whether the thyristor dimmer 102 is connected according to the input voltage, and outputs a control signal to the bleeder circuit 107; meanwhile, the bleeder circuit 107 controls the on/off of the bleeder current in the lighting circuit 100 according to the control signal.
Referring to fig. 5, the step S100 includes:
s101, converting alternating-current voltage with a certain frequency into a low-voltage detection signal with the same frequency by the input signal sampling circuit;
s102, carrying out fast Fourier transform on the low-voltage detection signal by an FFT (fast Fourier transform) conversion circuit, and converting a time domain signal into a frequency domain signal;
s103, filtering out signals of other frequency components by a band-pass filter, filtering out signals with a frequency 3 times of the ac voltage frequency, and outputting the signals to the bleeder circuit 107.
Specifically, in this embodiment, the input Signal is connected to the input voltage Vac1 by a circuit, the input voltage Vac1 is scaled down to obtain a low-voltage detection Signal1, the low-voltage detection Signal is input to the FFT conversion circuit 202 to perform fourier transform to generate a frequency domain Signal2, the frequency domain Signal2 is input to the band-pass filter 203, the frequency domain Signal is filtered by the band-pass filter 203 to obtain a control Signal3, the control Signal3 is output to the bleeding circuit 107, and the bleeding circuit 107 controls the conduction and the disconnection of the bleeding current in the lighting circuit 100 according to the control Signal 3.
Further, referring to fig. 6, the step S200 includes:
s201, if the frequency of the control signal is 3 times of the frequency of the input voltage, the leakage circuit conducts the leakage current to the ground;
s202, if the control signal is zero, the bleeder circuit does not release the bleeder current.
When the triac dimmer 102 is connected, the control Signal3 output by the band pass filter 203 is recorded as a first control Signal, the bleeding circuit 107 is turned on according to the first control Signal, and a bleeding current in the lighting circuit 100 is led to the ground terminal to maintain the normal operation of the triac dimmer 102; when the triac dimmer 102 is not connected to the circuit, the leakage circuit 107 cuts off the leakage current, so that a loop cannot be formed, and additional power consumption under the condition of no triac dimmer 102 is avoided. The rectifying circuit 103 rectifies an alternating current input signal into a voltage signal with positive amplitude, and transmits the voltage signal to the light source 106 for power supply. Specifically, the frequency of the first control signal is 3 times of the input voltage, and the voltage of the second control signal is 0V.
Based on the lighting circuit, the invention further provides a lighting lamp, which comprises a lamp body and the lighting circuit, wherein the lighting circuit is arranged in the lamp body. Specifically, a circuit board is further arranged in the lighting lamp, and the lighting circuit is arranged on the circuit board. Since the lighting circuit has been described in detail above, it is not described in detail here.
In summary, the lighting circuit, the lighting lamp and the thyristor dimmer access detection method for circulating power supply provided by the invention comprise a thyristor 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 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.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (8)
1. A lighting circuit is characterized by comprising 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; the rectifying circuit rectifies an alternating current input signal into a voltage signal with positive amplitude and transmits the voltage signal to a light source for power supply; driving a light source 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.
2. The lighting circuit of claim 1, 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.
3. The lighting circuit of claim 2, 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.
4. 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.
5. 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;
rectifying the alternating current input signal into a voltage signal with positive amplitude by a rectifying circuit and transmitting the voltage signal to a 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:
an input signal sampling circuit converts an AC voltage having a constant frequency into a low-voltage detection signal having the same frequency.
6. The triac dimmer access detection method of claim 5, wherein the step of collecting an input voltage from the triac detection circuit, detecting whether a triac dimmer is accessed according to the input voltage, and outputting a control signal further comprises:
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;
and filtering signals of other frequency components by a band-pass filter, filtering out signals with the frequency being 3 times of the alternating voltage frequency, and outputting the signals to a bleeder circuit.
7. The triac dimmer access detection method of claim 6, 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.
8. A lighting fixture, comprising a fixture body and a lighting circuit as recited in any one of claims 1-4, said lighting circuit being disposed within said fixture body.
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