JP2024020150A - Dimmer detection method, dimmer detection circuit, and led lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To more accurately determine whether or not a dimmer is connected to a circuit.

SOLUTION: A dimmer detection method is a dimmer detection method for detecting whether or not a dimmer is connected to a driving circuit, and includes: a signal acquisition step S1 of acquiring an output voltage waveform at the time of an operation of the driving circuit, and acquiring a feature value of a waveform in a non-rising edge and a falling edge of the output voltage waveform in an edge interval; and a comparison determination step S2 of determining whether or not the dimmer is connected to the driving circuit on the basis of a comparison between the feature value and a corresponded standard value corresponded in a standard waveform pattern. The dimmer detection method includes a step of calculating the output voltage waveform, and comparing the output voltage waveform with the standard waveform when the dimmer is not connected to the circuit to more accurately determine whether or not the dimmer is connected to the circuit and to perform a following circuit adjustment control corresponded to them.

SELECTED DRAWING: Figure 3

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to the field of lighting technology, and specifically relates to a dimmer detection method, a dimmer detection circuit, and an LED lighting fixture.

In a lighting system, a dimmer is typically used to provide an input signal to the lighting system to adjust the current or voltage of the lighting system, thereby adjusting the luminous flux of the light source in the lighting system and adjusting the illuminance level of the light source in the lighting system. Realize.

In the prior art, it is common for a dimmer to chop the waveform of an input signal of a lighting system and transfer the remaining part of the chopped waveform signal to the lighting system. For example, a leading or forward phase dimmer chops the leading edge of the voltage signal waveform, or a trailing or backward phase dimmer chops the trailing edge of the voltage signal waveform.

In prior patent CN105265026A a method for detecting leading edge phase cut dimmers is provided. By detecting whether the input signal waveform has a steep rising edge, if the input signal waveform has a steep rising edge, the edge detector output signal includes a signal pulse, and the pulse extender output signal is output within a predetermined time. Based on the number of pulses expanded in , it is determined whether a leading edge phase cut dimmer is connected to the circuit.

As shown in FIG. 1, when the dimmer is not connected, the input signal waveform is a sine wave shown at V _SUPPLY . After being chopped by the dimmer, the leading edge of the waveform is phase-cut every half cycle, and the part of the waveform shown by the dotted line is chopped, resulting in a steep rising edge at _VF of the leading edge of the waveform, as shown in V _DIM . is formed.

However, in actual applications, if the load circuit in the lighting system cannot supply sufficient holding current to the dimmer, the dimmer may not operate normally or the voltage output waveform of the dimmer may become abnormal. , abnormalities may also occur in the chopping waveform. For example, as shown in FIG. 2, an abnormal signal occurs at the leading edge of the waveform every half cycle. If a method of detecting a steep rising edge of the above waveform is used to determine whether or not a dimmer is connected to the circuit, the false determination rate will be high.

In view of the above problems, the present invention provides a dimmer detection method, a dimmer detection circuit, and an LED lighting fixture. The dimmer detection method provided by the present invention calculates the output voltage waveform and compares the output voltage waveform with a standard waveform when no dimmer is connected to the circuit in real time. To more accurately determine whether a dimmer is connected or not, and perform circuit adjustment control accordingly.

The technical solution of the present invention provides a dimmer detection method for detecting whether a dimmer is connected to a drive circuit, and the dimmer detection method acquires an output voltage waveform when the drive circuit is operating. The signal acquisition step S1 acquires waveform characteristic values in the non-rising edge and falling edge sections of the output voltage waveform, and the drive circuit is adjusted based on the comparison between the characteristic values and the corresponding standard values in the standard waveform pattern. and a comparison determination step S2 for determining whether or not the optical device is connected.

According to the technical solution of the present invention, non-rising edge and falling edge sections, that is, sections that are neither steeply rising edges nor steeply falling edges, have more sampling points, and can be obtained from many sampling points. By comparing the characteristic values of the waveform obtained with the standard values of the standard waveform, it is possible to more comprehensively and comprehensively reflect whether or not the waveform is a waveform formed by chopping. The constant rate can be reduced and the detection accuracy can be increased.

Preferably, in the technical solution of the present invention, the dimmer detection method further includes a pattern establishment step S0 of establishing a standard waveform pattern based on the output voltage waveform of the drive circuit to which the dimmer is not connected.

According to the technical solution of the present invention, the waveform when the dimmer is not connected to the driving circuit is generally a standard sine wave, and the normal output when the dimmer is not connected to the driving circuit. It can reflect the voltage situation. By storing a standard sine wave as a standard waveform pattern in advance, a more accurate reference standard can be provided, which is advantageous for subsequent comparison and determination of the output voltage waveform.

Further, in the technical solution of the present invention, the dimmer detection method further includes a protection step S3 of performing a corresponding input adjustment protection operation when it is determined that the dimmer is connected to the driving circuit.

According to the technical solution of the present invention, when the dimmer is connected to the driving circuit, it can chop the original output voltage of the driving circuit, which can greatly affect the output of the entire driving circuit. Furthermore, the input/output voltage and current conditions required for the dimmer may be different from those of the original drive circuit. Therefore, when it is determined that the dimmer is connected to the drive circuit, the input/output circuit connected to the drive circuit is connected to the dimmer or the drive circuit by performing a corresponding adjustment protection operation. This prevents other circuits or elements that have been connected to the device from operating abnormally and causing further failure.

Preferably, in the technical solution of the present invention, the characteristic value of the output voltage waveform in the dimmer detection method is the number of points at which the output voltage becomes 0 in the output voltage waveform within one or more cycles.

According to the technical solution of the present invention, when the dimmer is not connected to the driving circuit, the output voltage waveform, that is, the output voltage in each cycle of the standard waveform pattern, has zero or one point of 0V. The number of points where the output voltage is 0V is taken as the characteristic value, 0 or 1 is taken as the standard value of the standard waveform pattern, and the number of points where the output voltage is 0V in each period in the output voltage waveform is 2 or 2 or more. It can be seen that in some cases a dimmer is connected to the drive circuit. With the above method, it is possible to quickly and accurately determine whether a dimmer is connected or not with a relatively low amount of calculation.

Preferably, in the technical solution of the present invention, the characteristic value of the output voltage waveform in the dimmer detection method is the number of points at which the derivative of the output voltage is 0 in the output voltage waveform within one or more periods. .

According to the technical solution of the present invention, when the dimmer is not connected to the drive circuit, the output voltage waveform, that is, the standard waveform pattern, is a sine wave, and in each period, the voltage rises, then falls, and then rises again. do. The derivative of the voltage value changes in the order of positive - negative - positive, the number of points where the derivative is 0 is 2 or less than 2, and the number of points where the derivative of the output voltage is 0 is taken as a characteristic value, If the number of points at which the derivative of the output voltage becomes 0 within each period in the output voltage waveform is greater than two, it can be seen that a dimmer is connected to the drive circuit. With the above method, it is possible to quickly and accurately determine whether a dimmer is connected or not with a relatively low amount of calculation.

Preferably, in the technical solution of the present invention, the characteristic value of the output voltage waveform in the dimmer detection method is the degree of similarity between the output voltage waveform and the waveform of the standard waveform pattern.

According to the technical solution of the present invention, when the waveform similarity is the characteristic value, and the time as the value of the waveform abscissa is the same, the output voltage waveform and the standard waveform pattern have the same corresponding voltage values at the same time. By determining whether or not the output voltage waveform is similar to the waveform of the standard waveform pattern, it is further determined whether or not a dimmer is connected to the drive circuit. By the above method, it is possible to determine whether or not a dimmer is connected with very high accuracy.

Furthermore, in the technical solution of the present invention, the dimmer detection method includes the step of storing a plurality of standard waveform patterns having different frequencies and voltage amplitudes, and in the comparison judgment step S2, the feature values are further added to the plurality of standard waveform patterns. Compare with each of the corresponding standard values in the pattern.

According to the technical solution of the present invention, if the frequency and voltage amplitude of the output voltage of the driving circuit are not the same, the shape of the standard voltage waveform obtained by operation and the reference value may both be different. Compare standard waveform patterns at multiple different frequencies and voltage amplitudes, and if the output voltage pattern and various standard waveform patterns are not the same, that is, they are not standard waveforms, and a dimmer is connected to the drive circuit. I can see that With the above method, it is possible to further determine the classification of the current voltage waveform with a relatively low amount of data storage.

The technical solution of the present invention further provides a dimmer detection circuit. The dimmer detection circuit can determine whether a dimmer is connected to the circuit by executing the dimmer detection method described above.

The technical solution of the present invention further provides an LED lighting fixture including the above dimmer detection circuit.

According to the technical solution of the present invention, the LED lighting equipment can be connected with a dimmer to adjust the luminous flux and illumination intensity of the LED lighting equipment. At the same time, the dimmer detection circuit described above calculates the output voltage waveform and compares the output voltage waveform with the standard waveform pattern when no dimmer is connected to the circuit in real time. It can accurately determine whether the light fixture is connected or not, so it can perform circuit adjustment control accordingly, realizing excellent adjustment performance in the lighting effect of LED lighting equipment, and also Better condition and protect your own circuit connections.

Preferably, in the technical solution of the present invention, other electrical equipment incompatible with the dimmer can be installed in the socket of the LED lighting fixture, and the dimmer detection circuit connects the dimmer to the driving circuit. If it is detected that the dimmer is connected to the socket and an electrical device that is not compatible with the dimmer is connected, the power supply to the electrical device is cut off.

According to the technical solution of the present invention, when the dimmer detection circuit detects that the dimmer is connected to the drive circuit, it cuts off the connection of the electrical equipment that is incompatible with the dimmer, and / Or the dimmer can be protected and the normal operation of the dimming function of the LED lighting equipment can be guaranteed.

FIG. 1 is a schematic diagram of an input signal waveform in the prior art. FIG. 2 is a schematic diagram of another input signal waveform in the prior art. FIG. 3 is a schematic diagram of a dimmer detection method according to Embodiment 1 of the present invention. FIG. 4 is a schematic diagram of a preferred dimmer detection method according to the first embodiment of the present invention. FIG. 5 is a schematic diagram of a standard waveform pattern according to Embodiment 1 of the present invention. FIG. 6 is a schematic diagram of an output voltage waveform when a dimmer is connected to the drive circuit according to Embodiment 1 of the present invention. FIG. 7 is a schematic diagram of an output voltage waveform of a drive circuit according to Embodiment 2 of the present invention. FIG. 8 is a schematic diagram of a dimmer detection circuit according to Embodiment 4 of the present invention.

Hereinafter, the technical solution of the present invention will be explained in detail in an easy-to-understand manner using the figures. The embodiments described below are some embodiments of the present invention, and do not represent all embodiments. All embodiments that a person skilled in the art can think of without creative effort based on the embodiments of the present invention are included within the scope of the present invention.

(Embodiment 1)
A light source drive circuit for an LED lighting fixture will be explained as an example. The output voltage of the drive circuit is output to the LED light source, and the LED light source is driven so that the LED light source turns on and provides illumination. The brightness of the LED light source can be adjusted depending on the output voltage of the drive circuit. Specifically, a dimmer can be connected to the drive circuit, and the dimmer chops the drive circuit output voltage waveform and cuts the phase, thereby changing the voltage waveform input to the LED light source. It is controlled by adjusting the duty ratio and adjusting the brightness of the LED light source.

FIG. 3 is a schematic diagram of a dimmer detection method according to Embodiment 1 of the present invention.

As shown in FIG. 3, the first embodiment of the present invention provides a dimmer detection method for detecting whether a dimmer is connected to a drive circuit. The dimmer detection method includes a signal acquisition step S1 in which the drive circuit acquires the output voltage waveform during operation, and acquires the characteristic values of the waveform in the non-rising edge and falling edge sections of the output voltage waveform, and the characteristic value and standard and a comparison determination step S2 of determining whether or not a dimmer is connected to the drive circuit based on a comparison with a corresponding standard value in the waveform pattern.

"Non-rising edge and falling edge section" means a steep rising edge (i.e., the leading edge of the waveform at the chop position) and a steep falling edge (i.e., the trailing edge of the waveform at the chop position) in one or more cycles. ) indicates an area other than that. By performing a comprehensive analysis based on periods of voltage stability and/or change within one or more periods in the input voltage waveform, it is possible to improve the comprehensiveness of the selection of feature values that are the basis for comparison, and to The accuracy of judgment can be improved.

The waveform characteristic values referred to here may be data characteristics of the input voltage waveform, such as specific numerical values such as maximum and minimum values within a period, and sine waves, cosine waves, triangular waves, peaks of waveform changes, etc. It may be a shape feature of the input voltage waveform, such as a valley, or a change rule of the input voltage waveform, such as a periodic feature. The characteristic value is not particularly limited as long as it is a characteristic that can clearly distinguish between the characteristic of the waveform after being modulated by the dimmer and the standard waveform pattern.

Specifically, the drive circuit drives a load such as an LED light source, acquires the output voltage waveform during operation of the drive circuit in real time using the dimmer detection method described above, and sends the output voltage waveform stored in advance to the drive circuit. Compare with the standard waveform pattern of the output voltage when the optical device is not connected. The non-rising edge and falling edge sections used for comparison have more sampling points, and the waveform is determined by comparing the characteristic values of the waveform obtained from many sampling points with the standard values of the standard waveform. Whether or not the waveform is formed by chopping can be more fully reflected. Even in a state where the dimmer is not operating normally, it is possible to avoid or reduce erroneous determinations due to instability of waveform changes modulated by the dimmer. This can increase the accuracy of detection when the dimmer is connected, and can more easily and accurately adjust and control the drive circuit after the dimmer is connected.

FIG. 4 is a schematic diagram of a preferred dimmer detection method according to the first embodiment of the present invention.

As shown in FIG. 4, the dimmer detection method according to the first embodiment of the present invention further establishes a standard waveform pattern based on the output voltage waveform of the drive circuit when the dimmer is not connected. A pattern establishment step S0 is included.

As shown in Figure 5, the waveform when the dimmer is not connected to the drive circuit is usually a sine wave, and the sine wave is the normal output when the dimmer is not connected to the drive circuit. Can reflect voltage. By storing the sine wave in advance as a standard waveform pattern, a more accurate reference standard can be provided, which is advantageous for subsequent comparison and determination of the output voltage waveform. In FIG. 5, the ordinate U indicates the voltage value, the abscissa T indicates the time, and one period of the sine wave is 2t.

Preferably, in the first embodiment of the present invention, the characteristic value of the output voltage waveform in the dimmer detection method is the number of points at which the output voltage is 0V in the output voltage waveform within one or more cycles.

It is necessary to mention here that the determination period of the above characteristic value may be equal to the period of the output voltage waveform, for example, it may be 2t, like the actual cycle period of a sine wave, or it may have multiple periods, Alternatively, it may be any artificially determined time period used for determining feature values, and is not particularly limited here.

For example, in the first embodiment, when the AC voltage is rectified, the original negative voltage is inverted, and the half period t of the sine wave is used as the characteristic value determination period. As shown in FIG. 5, in one period, for example, 0-t, there are one or two intersections between the waveform of the standard waveform pattern and the abscissa, and the output voltage in the output voltage waveform within one period is 0V. One or two points are defined as the standard value of the standard waveform pattern.

FIG. 6 shows an output voltage waveform when a dimmer is connected to the drive circuit according to Embodiment 1 of the present invention.

As shown in FIG. 6, the output voltage waveform chopped by the dimmer has a section in which the continuous voltage value is 0V in each period t, and the output voltage in the output voltage waveform within one period t is 0V. The feature value, which is the number of points where It can be determined that there is no As a result, since the output voltage waveform of the drive circuit does not correspond to the standard waveform pattern, it can be determined that the dimmer is connected to the drive circuit. On the other hand, if the characteristic value, which is the number of points at which the output voltage becomes 0V in the output voltage waveform within one period t, is one or two, in other words, the characteristic value and the standard value correspond to each other. It can be determined that the dimmer is not connected to the drive circuit. With the above method, it is possible to quickly and accurately determine whether or not a dimmer is connected with a relatively small amount of calculation.

Preferably, in order to avoid the influence on the accuracy of determining the connection status of the dimmer from abnormal situations such as mutations in the output voltage caused by interference elements, in practical applications, the above dimmer detection method may be implemented using multiple The determination may be made comprehensively by referring to the comparison status between the characteristic value within the period and the corresponding standard value in the standard waveform pattern. Furthermore, for a plurality of cycles, non-consecutive cycles with regular intervals may be selected. Thereby, it is possible to further improve the comprehensive selection of feature values, and it is also possible to improve the accuracy of determining the connection state of the dimmer.

Further, in the first embodiment of the present invention, the dimmer detection method includes an adjustment protection step S3 in which, when it is determined that the dimmer is connected to the drive circuit, a corresponding adjustment protection operation is performed.

After the dimmer is connected to the drive circuit, it chops the original output voltage of the drive circuit, which greatly affects the output of the entire drive circuit, and the input and output voltage and current conditions required for the dimmer are originally There may be a possibility that the drive circuit is different from that of the drive circuit. If it is determined through the above steps that the dimmer is connected to the drive circuit, the dimmer or drive circuit can be controlled by performing appropriate adjustment protection operations on the input/output circuits connected to the drive circuit. This prevents other circuits and elements connected to the device from operating abnormally and causing further failure.

For example, if you identify that a dimmer is connected to the drive circuit, you can turn off the power supply that does not match the dimmer (for example, 220V of commercial power supply voltage) to prevent the incorrect connection of the dimmer from the drive circuit. It is possible to protect equipment or loads and ensure stable and normal operation. Alternatively, the drive circuit may be connected to loads operating at different ratings (e.g., LED light sources of different standards or connection types), and when a dimmer is connected to the drive circuit, the output value of the drive circuit may change. After that, by switching the load connected to the drive circuit and matching the rated standard of the switched load to the current output of the drive circuit, better lighting effects etc. can be obtained.

(Embodiment 2)
In the dimmer detection method according to Embodiment 2 of the present invention, the steps of dimmer detection determination are the same as those in Embodiment 1, so a description thereof will be omitted here. The difference from Embodiment 1 is that in the dimmer detection method of this embodiment, the characteristic value of the output voltage waveform is such that the derivative of the output voltage in the output voltage waveform within one or more cycles is 0. is the number of pieces.

FIG. 7 is a schematic diagram of the output voltage waveform of the drive circuit according to Embodiment 2 of the present invention.

As shown in FIG. 7, when the dimmer is not connected to the drive circuit, the standard waveform pattern _L1 , which is the output voltage waveform, is a sine wave, and each period t (half period t of the sine wave is defined as the characteristic value). In the determination period), the output voltage rises from the 0 point, reaches the peak value, begins to fall, returns to the 0 point again, enters the next period, and continues the cycle. In one period t of the standard waveform pattern, there is one point where the derivative of the output voltage in the standard waveform pattern _L1 becomes positive, then becomes negative, and the derivative of the output voltage becomes 0, that is, the standard waveform pattern The standard value of is one. Derivative of output voltage = Δu/Δt = (u ₂ - u ₁ )/(t ₂ - t ₁ ).

Continuing with reference to FIG. 7, the output voltage in the output voltage waveform _L2 is not a standard sine wave, but in each period t, the output voltage rises from the 0 point and begins to fall when it reaches the first peak value, When the bottom value is reached, it rises again, and when it reaches the second peak value, it falls again, returns to the zero point, enters the next period, and continues the cycle. In one period t, the derivative of the output voltage in the output voltage waveform L ₂ changes in the order of positive - negative - positive - negative, and the number of points where the derivative of the output voltage becomes 0, that is, the characteristic value is 3. Therefore, it can be determined that the feature value does not match one of the standard values. Thereby, since the output voltage waveform of the drive circuit and the standard waveform pattern do not match, it can be determined that the dimmer is connected to the drive circuit. On the other hand, if the number of points at which the derivative of the output voltage in the output voltage waveform within one period t is 0, that is, the characteristic value is one, that is, the characteristic value and the standard value match, so the driving It can be determined that the dimmer is not connected to the circuit. With the above method, it is possible to complete the determination of whether or not the dimmer is connected with high accuracy.

Similarly, in order to avoid the influence on the accuracy of determining the connection state of the dimmer from abnormal situations such as mutations in the output voltage caused by interference elements, in practical applications, the above dimmer detection method uses multiple The determination may be made comprehensively by referring to the comparison status between the characteristic value within the period and the corresponding standard value in the standard waveform pattern. Furthermore, for a plurality of cycles, non-consecutive cycles with regular intervals may be selected. Thereby, it is possible to further improve the comprehensive selection of feature values, and it is also possible to improve the accuracy of determining the connection state of the dimmer.

(Embodiment 3)
In the dimmer detection method according to Embodiment 3 of the present invention, the steps of dimmer detection determination are the same as those in Embodiments 1 and 2, and therefore the description thereof will be omitted here. The difference from Embodiments 1 and 2 is that in the dimmer detection method of this embodiment, the feature value of the output voltage waveform is the degree of similarity between the output voltage waveform and the waveform of the standard waveform pattern.

Specifically, the output voltage waveform when the dimmer is not connected to the drive circuit is taken as a standard waveform pattern, and the waveform shape is as shown in FIG. 5, and at each point on the abscissa, that is, at time, Corresponding ordinate values or voltages correspond. The waveform similarity is taken as a feature value, and in this embodiment, the ordinate of each point in the standard waveform pattern is taken as a standard value, and when the value of the waveform abscissa is the same, that is, at the same time, the output voltage waveform and the standard waveform pattern By determining whether the corresponding voltage values are the same at the same time, or by calculating the degree of deviation, the degree of similarity between the output voltage waveform and the waveform of the standard waveform pattern is determined, and the Determine whether the dimmer is connected.

For example, referring to FIG. 5, since the output voltage corresponding to time t ₀ in the standard waveform pattern is u ₀ , the standard value of the standard waveform pattern is u ₀ . Referring to FIG. 6, since the output voltage corresponding to time t ₀ in the output voltage waveform is 0, the characteristic value is 0, so it can be determined that the characteristic value and the standard value u ₀ do not match. Thereby, since the output voltage waveform of the drive circuit and the standard waveform pattern do not match, it can be determined that the dimmer is connected to the drive circuit. On the other hand, if the output voltage corresponding to time t ₀ in the output voltage waveform is u ₀ , the characteristic value and the standard value match or the degree of deviation is not large, indicating that the dimmer is not connected to the drive circuit. It can be determined that With the above method, it is possible to further determine the type of the current voltage waveform with a relatively small amount of data storage.

What I would like to mention here is that in this embodiment, the waveform similarity as a feature value is expressed by the coordinates of one point. However, in actual applications, the waveform similarity may be expressed by different elements, such as the coordinates of multiple points, the overall shape of the waveform, and the rising/falling tendency.

Furthermore, in Embodiment 3 of the present invention, the dimmer detection method includes the following steps: storing a plurality of standard waveform patterns having different frequencies and voltage amplitudes, and determining characteristic values in the comparison determination step S2. Compare each of the corresponding standard values in the plurality of standard waveform patterns.

If the frequency and amplitude of the voltage of the drive circuit are different, the shape of the standard voltage waveform obtained during operation and the reference value may both be different. Some embodiments include standard waveform patterns at six different frequencies and voltages, with reference to the table below, examples of which are frequencies of 50 Hz and 60 Hz, respectively, and input voltages of 90 V, 100 V, and 110 V, respectively. I will provide a.

The above standard waveform patterns (1) to (6) are all sine waves, but their periods and amplitudes are different, that is, the voltage values corresponding to time _t0 are also different, and the standard waveform patterns (1) to (6) are different. has six or six sets of corresponding standard values. Compare the characteristic value of the output voltage waveform with each of the corresponding standard values in the six standard waveform patterns, and if none of the characteristic values of the output voltage pattern are the same as the standard values of the various standard waveform patterns, the current output voltage It can be seen that the waveform does not correspond to any standard waveform pattern, that is, a dimmer is connected to the drive circuit. If the characteristic value of the output voltage pattern is the same as the standard value of any of the standard waveform patterns, it means that the dimmer is not connected to the drive circuit, and the frequency and amplitude of the output voltage can also be determined. can.

Furthermore, based on the three embodiments described above, in order to increase the accuracy of detecting the connection state of the dimmer, it is possible to combine the judgment grounds in the three embodiments described above and analyze the voltage waveform from different angles. By making this determination, a detection result with even higher accuracy may be obtained.

(Embodiment 4)
FIG. 8 is a schematic diagram of a dimmer detection circuit according to Embodiment 4 of the present invention.

As shown in FIG. 8, in the fourth embodiment of the present invention, the dimmer detection circuit provides a dimmer detection circuit including an alternating current power supply AC, a control unit MCU, and a switching circuit 1. The switching circuit 1 is connected in parallel to the alternating current power supply AC, the signal detection terminal x of the control unit MCU is connected to the alternating current power supply AC, and the signal output terminal y of the control unit MCU is connected to the control terminal of the switching circuit 1. The dimmer detection circuit can determine whether a dimmer is connected to the circuit by executing the dimmer detection method according to the embodiment described above.

Embodiment 4 of the present invention further provides an LED lighting fixture including the above dimmer detection circuit.

According to the above scheme, the LED lighting equipment can be connected to a dimmer to adjust the luminous flux and illumination intensity of the LED lighting equipment. At the same time, the dimmer detection circuit described above calculates the output voltage waveform and compares the output voltage waveform with the standard waveform pattern when no dimmer is connected to the circuit in real time. It is possible to accurately determine whether the dimmer is connected or not. This allows the corresponding circuit adjustment to be controlled and the circuit connections of the dimmer and the LED luminaire itself to be better regulated and protected.

Preferably, in the fourth embodiment of the present invention, it is possible to attach other electrical equipment that is not compatible with the dimmer to the socket of the LED lighting fixture. The dimmer detection circuit detects that a dimmer is connected to the drive circuit, and if the electrical device connected to the socket is not compatible with the dimmer, it stops supplying power to the electrical device. cut off.

According to the above scheme, when the dimmer detection circuit detects that the dimmer is connected to the drive circuit, the dimmer is disconnected from the electrical equipment that is incompatible with the dimmer. Alternatively, the dimmer can be protected and the normal operation of the dimming function of the LED lighting equipment can be guaranteed.

The technical solution of the present invention has been described above with reference to the drawings in the specification. It is obvious to those skilled in the art that the protection scope of the present invention is not limited to the above-described specific embodiments. Without departing from the spirit of the present invention, those skilled in the art can make equivalent changes or replacements to related technical features, and technical solutions after changes and replacements are also included within the protection scope of the present invention.

1 Switching circuit AC AC power supply MCU control unit x Signal detection terminal y Signal output terminal

Claims (11)

A dimmer detection method for detecting whether a dimmer is connected to a drive circuit, the method comprising:
a signal acquisition step S1 in which the drive circuit acquires an output voltage waveform during operation, and acquires characteristic values of the waveform in non-rising edge and falling edge sections of the output voltage waveform;
The method is characterized by comprising a comparison determination step S2 of determining whether or not the dimmer is connected to the drive circuit based on a comparison between the characteristic value and a corresponding standard value in a standard waveform pattern. Dimmer detection method. The dimmer detection method according to claim 1, further comprising a pattern establishment step S0 of establishing a standard waveform pattern based on the output voltage waveform of the drive circuit to which the dimmer is not connected. . The dimmer detection method according to claim 2, further comprising a protection step S3 of performing an input adjustment protection operation in response to the determination that the dimmer is connected to the drive circuit. The dimmer detection method according to claim 3, wherein the characteristic value is the number of points at which the output voltage in the output voltage waveform becomes 0 within one or more cycles. The dimmer detection method according to claim 3, wherein the characteristic value is the number of points at which the derivative of the output voltage in the output voltage waveform within one or more cycles is zero. The dimmer detection method according to claim 3, wherein the feature value is a degree of similarity between the output voltage waveform and the waveform of the standard waveform pattern. further comprising storing a plurality of said standard waveform patterns having different frequencies and voltage amplitudes;
The dimmer according to any one of claims 1 to 6, wherein in the comparison and determination step S2, the feature value is further compared with each of the corresponding standard values in the plurality of standard waveform patterns. Detection method. A dimmer detection circuit, characterized in that it executes the dimmer detection method according to any one of claims 1 to 6. The dimmer detection method further includes storing a plurality of the standard waveform patterns having different frequencies and voltage amplitudes;
The dimmer detection circuit according to claim 8, wherein in the comparison and determination step S2, the feature value is further compared with each of the corresponding standard values in the plurality of standard waveform patterns. An LED lighting fixture comprising the dimmer detection circuit according to claim 8. Other electrical equipment incompatible with the dimmer can be attached to the socket of the LED lighting fixture,
If the dimmer detection circuit detects that the dimmer is connected to the drive circuit, and the electrical device connected to the socket is incompatible with the dimmer, The LED lighting device according to claim 10, wherein power supply to the electric device is cut off.

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