阅读说明：本技术 基于通信协议调光的可控硅调光器及其工作方法 (Silicon controlled rectifier dimmer based on communication protocol dimming and working method thereof ) 是由 不公告发明人 于 2020-12-31 设计创作，主要内容包括：本发明提供一种基于通信协议调光的可控硅调光器及其工作方法,该调光器包括通信协议接口电路、控制器、斩波电路、过零检测电路以及选择开关电路；通信协议接口电路向控制器输出调光控制信号,控制器还接收选择开关电路输出的选择信号以及过零检测电路输出的过零检测信号,并根据调光控制信号、过零检测信号以及选择信号向斩波电路输出脉冲调制信号,其中,选择信号用于确定脉冲调制信号的前沿斩波或者后沿斩波。该工作方法包括是上述可控硅调光器的该工作方法,控制器根据调光控制信号、过零检测信号以及选择信号向斩波电路输出脉冲调制信号,并可以选择前沿斩波或者后沿斩波。本发明的可控硅调光器可以兼容前沿控制或者后沿控制两种方式。(The invention provides a silicon controlled rectifier dimmer based on communication protocol dimming and a working method thereof, wherein the dimmer comprises a communication protocol interface circuit, a controller, a chopper circuit, a zero-crossing detection circuit and a selective switch circuit; the communication protocol interface circuit outputs a dimming control signal to the controller, the controller also receives a selection signal output by the selection switch circuit and a zero-crossing detection signal output by the zero-crossing detection circuit, and outputs a pulse modulation signal to the chopper circuit according to the dimming control signal, the zero-crossing detection signal and the selection signal, wherein the selection signal is used for determining the leading edge chopping or the trailing edge chopping of the pulse modulation signal. The working method comprises the working method of the silicon controlled rectifier dimmer, and the controller outputs a pulse modulation signal to the chopper circuit according to the dimming control signal, the zero-crossing detection signal and the selection signal and can select the front-edge chopping or the back-edge chopping. The silicon controlled dimmer can be compatible with a front edge control mode or a back edge control mode.)

1. A thyristor dimmer that dims based on a communication protocol, comprising:

the device comprises a communication protocol interface circuit, a controller, a chopper circuit, a zero-crossing detection circuit and a selection switch circuit;

the communication protocol interface circuit outputs a dimming control signal to the controller, the controller also receives a selection signal output by the selection switch circuit and a zero-crossing detection signal output by the zero-crossing detection circuit, and outputs a pulse modulation signal to the chopper circuit according to the dimming control signal, the zero-crossing detection signal and the selection signal, wherein the selection signal is used for determining the leading edge chopping or the trailing edge chopping of the pulse modulation signal.

2. The triac dimmer according to claim 1, wherein:

the communication protocol interface circuit is a DALI communication protocol interface circuit, a Bluetooth 5.0Mesh communication protocol interface circuit, a DMX communication protocol interface circuit or an RDM communication protocol interface circuit.

3. The triac dimmer according to claim 2, wherein:

the DALI communication protocol interface circuit is provided with a first photoelectric coupler, and the first photoelectric coupler is connected with a signal sending end and/or a signal receiving end of the DALI communication protocol interface circuit.

4. The triac dimmer according to any one of claims 1 to 3, wherein:

the chopper circuit is provided with a first switching device and a second switching device, the first switching device and the second switching device both receive the pulse modulation signal, and the conduction levels of the first switching device and the second switching device are opposite.

5. The triac dimmer according to claim 4, wherein:

the chopper circuit further comprises a third switching device and a fourth switching device, and a control end of the third switching device and a control end of the fourth switching device are both connected to a joint of the first switching device and the second switching device.

6. The triac dimmer according to claim 4, wherein:

the chopper circuit further includes a second photoelectric coupler that receives the pulse modulation signal and outputs a signal to the first switching device and the second switching device.

7. The triac dimmer according to any one of claims 1 to 3, wherein:

the silicon controlled dimmer also comprises a power supply circuit, and the power supply circuit supplies power to the communication protocol interface circuit and the controller.

8. The method of operating a triac dimmer according to any one of claims 1 to 7, wherein:

the communication protocol interface circuit outputs a dimming control signal to the controller;

the controller acquires a zero-crossing detection signal and a selection signal, calculates a pulse modulation signal output to a chopper circuit according to the dimming control signal, and outputs the pulse modulation signal to the chopper circuit, wherein the selection signal is used for determining leading edge chopping or trailing edge chopping of the pulse modulation signal.

9. The method of claim 8, wherein the operating mode of the triac dimmer comprises:

the controller calculates the duty ratio of the pulse modulation signal according to the dimming control signal.

10. The method of operating a triac dimmer based on communication protocol dimming as claimed in claim 8 or 9, wherein:

the controller outputs pulse modulation signals to more than two chopper circuits.

Technical Field

The invention relates to the field of control of intelligent lamps, in particular to a silicon controlled dimmer based on communication protocol dimming and a working method of the silicon controlled dimmer.

Background

The traditional lamps are mainly tungsten filament lamps, fluorescent lamps or incandescent lamps, the lamps are still mainstream lamps in the market, and with the popularization of dimming technology, how to apply advanced dimming technology to intelligent control of the traditional lamps is a problem which is addressed by the lamp industry. The DALI communication protocol is a communication protocol used by the most advanced light control system in the world at present, can control each lamp individually, can realize linear control of brightness, color temperature, color and the like, can control the lamps in groups, can set different contextual models and plans, and can realize energy consumption monitoring of the lamps.

With the continuous development of dimming technology, various dimming technologies emerge endlessly, wherein, the silicon controlled rectifier dimming technology is a common dimming technology, and the dimming technology has the advantage of simple installation mode. At present, the silicon controlled rectifier dimming technology has two dimming modes, namely a leading edge control mode and a trailing edge control mode. Referring to fig. 1, for a half-wave period of a sine wave, if a leading edge control method is adopted, after a zero-crossing point of an alternating current, chopping is performed backward from the zero-crossing point, for example, a hatched portion in fig. 1 is a chopped portion, for example, the chopping ratio is 30%, the output dimming ratio is 70%, and an arrow in the figure is a direction of chopping. Referring to fig. 2, if the trailing edge control mode is adopted, the chopping is performed forward from the zero crossing point, for example, the hatched portion in fig. 2 is the chopped portion, and the arrow in the figure is the direction of the chopping.

Generally, the compatibility requirement of a leading-edge control dimmer on a rear-stage silicon controlled rectifier driving power supply is low, but the leading-edge control dimmer has large interference on a power grid and is easy to generate noise; the dimmer adopting the back edge control has relatively higher requirement on the compatibility of the rear-stage silicon controlled rectifier driving power supply, but the dimmer adopting the back edge control has smaller interference on a power grid, has better experience feeling on lighter loads and is suitable for occasions with higher requirement, so the front edge control mode and the back edge control mode have respective advantages and disadvantages. However, the existing dimmer can only use one dimming mode, once the dimming mode of the dimmer is determined, the user cannot select or change the dimming mode, and great limitation is caused to the application of the dimmer.

Disclosure of Invention

The first purpose of the invention is to provide a thyristor dimmer based on communication protocol dimming, which can meet the requirements of various occasions.

The second objective of the present invention is to provide an operating method of the thyristor dimmer based on communication protocol dimming.

In order to achieve the first object of the invention, the silicon controlled dimmer based on communication protocol dimming provided by the invention comprises a communication protocol interface circuit, a controller, a chopper circuit, a zero-crossing detection circuit and a selective switch circuit; the communication protocol interface circuit outputs a dimming control signal to the controller, the controller also receives a selection signal output by the selection switch circuit and a zero-crossing detection signal output by the zero-crossing detection circuit, and outputs a pulse modulation signal to the chopper circuit according to the dimming control signal, the zero-crossing detection signal and the selection signal, wherein the selection signal is used for determining the leading edge chopping or the trailing edge chopping of the pulse modulation signal.

According to the scheme, a user can select a leading edge control mode or a trailing edge control mode to perform dimming according to needs, for example, a selection switch circuit sends a selection signal to a controller, namely, the leading edge control or the trailing edge control is selected, the controller controls the chopping direction of a pulse modulation signal according to the selection signal, so that the switching between the leading edge control mode and the trailing edge control mode is realized, and the user can independently select the leading edge control mode or the trailing edge control mode.

Preferably, the communication protocol interface circuit is a DALI communication protocol interface circuit, a bluetooth 5.0Mesh communication protocol interface circuit, a DMX communication protocol interface circuit or an RDM communication protocol interface circuit.

Therefore, the DALI lighting control system converts dimming control signals of communication protocols such as DALI communication protocols into signals of silicon controlled rectifier front-edge chopping or back-edge chopping and outputs the signals, effectively extends advanced DALI lighting control to traditional light source control, and enables traditional lamps or silicon controlled rectifier dimming power supplies to be controlled by the DALI lighting control system.

The DALI communication protocol interface circuit is provided with a first photoelectric coupler, and the first photoelectric coupler is connected with a signal sending end and/or a signal receiving end of the DALI communication protocol interface circuit.

Therefore, the first photoelectric coupler can ensure that the large current of the external signal cannot impact other chips in the DALI communication protocol interface circuit, and ensure the stable work of the DALI communication protocol interface circuit.

In a further aspect, the chopper circuit has a first switching device and a second switching device, the first switching device and the second switching device both receive the pulse modulated signal, and the conduction levels of the first switching device and the second switching device are opposite.

It follows that chopping of the alternating current can be achieved by the opposite conduction level states of the first switching device and the second switching device.

In a further aspect, the chopper circuit further includes a third switching device and a fourth switching device, and a control terminal of the third switching device and a control terminal of the fourth switching device are both connected to a junction of the first switching device and the second switching device.

In a further aspect, the chopper circuit further includes a second photo coupler that receives the pulse modulated signal and outputs a signal to the first switching device and the second switching device.

Therefore, the second photoelectric coupler can prevent the impact of the instantaneous overhigh current of the pulse modulation signal on the first switch device and the second switch device.

According to a further scheme, the silicon controlled dimmer further comprises a power supply circuit, and the power supply circuit supplies power to the communication protocol interface circuit and the controller.

To achieve the second objective, the present invention provides an operating method of the triac dimmer based on communication protocol dimming, including: the communication protocol interface circuit outputs a dimming control signal to the controller; the controller acquires a zero-crossing detection signal and a selection signal, calculates a pulse modulation signal output to the chopper circuit according to the dimming control signal, and outputs the pulse modulation signal to the chopper circuit, wherein the selection signal is used for determining leading edge chopping or trailing edge chopping of the pulse modulation signal.

According to the scheme, a user can select a leading edge control mode or a trailing edge control mode to perform dimming according to needs, namely, a selection signal is sent to the controller through the selection switch circuit, the chopping direction of the pulse modulation signal is changed by the controller according to the selection signal, so that the adjustment of the leading edge control mode and the trailing edge control mode is realized, and the user can independently select the leading edge control mode or the trailing edge control mode.

Further, the controller calculates a duty ratio of the pulse modulation signal according to the dimming control signal.

Because the signal received by the communication protocol interface circuit is a digital signal, the digital signal contains a control instruction of the dimming proportion, and the controller calculates the duty ratio of the corresponding pulse modulation signal according to the control instruction of the dimming proportion in the dimming control signal, the light-emitting brightness of the light source can be ensured to be consistent with the dimming proportion in the dimming control signal.

In a further embodiment, the controller outputs pulse modulated signals to more than two chopper circuits.

Therefore, the controller can control a plurality of chopper circuits, namely a plurality of light sources can be controlled simultaneously, and the silicon controlled rectifier dimmer can carry out dimming control on a large number of light sources.

Drawings

Fig. 1 is a waveform diagram of the leading edge control mode.

Fig. 2 is a waveform diagram of the trailing edge control scheme.

Fig. 3 is a block diagram of an embodiment of a triac dimmer for dimming based on a communication protocol according to the present invention.

Fig. 4 is an electrical schematic diagram of a first communication protocol interface circuit in an embodiment of a triac dimmer based on communication protocol dimming according to the present invention.

Fig. 5 is an electrical schematic diagram of a zero crossing detection circuit in an embodiment of a triac dimmer for dimming based on a communication protocol in accordance with the present invention.

Fig. 6 is an electrical schematic diagram of a selection switch circuit in an embodiment of a triac dimmer for dimming based on a communication protocol according to the present invention.

Fig. 7 is an electrical schematic diagram of a controller in an embodiment of a triac dimmer that dims based on a communication protocol in accordance with the present invention.

Fig. 8 is an electrical schematic diagram of a chopper circuit in an embodiment of a thyristor dimmer for communication protocol based dimming according to the present invention.

Fig. 9 is an electrical schematic diagram of a power circuit in an embodiment of a triac dimmer for dimming based on a communication protocol in accordance with the present invention.

Fig. 10 is a flow chart of an embodiment of a method of operating a triac dimmer that is dimming based on a communication protocol in accordance with the present invention.

Fig. 11 is a waveform diagram of an ac signal and a pulse modulated signal in the leading edge control mode.

Fig. 12 is a waveform diagram of an ac signal and a pulse modulated signal in the trailing edge control mode.

Fig. 13 is an electrical schematic diagram of a second communication protocol interface circuit in an embodiment of a triac dimmer based on communication protocol dimming of the present invention.

Fig. 14 is an electrical schematic diagram of a third communication protocol interface circuit in an embodiment of a triac dimmer based on communication protocol dimming of the present invention.

The invention is further explained with reference to the drawings and the embodiments.

Detailed Description

The silicon controlled dimmer based on the communication protocol dimming is applied to the intelligent lamp, and can compatibly realize a front edge control mode and a back edge control mode, so that the dimming flexibility of the intelligent lamp is improved.

The embodiment of the thyristor dimmer based on the dimming of the communication protocol comprises the following steps:

referring to fig. 3, the present embodiment includes a communication protocol interface circuit 11, a zero-cross detection circuit 12, a selection switch circuit 13, a controller 14, a chopper circuit 15, and a power supply circuit 16. The communication protocol interface circuit 11 receives a signal transmitted by an external controller, for example, a signal received through a communication bus, where the signal is a digital signal, and the digital signal includes a control instruction of a dimming ratio, for example, to adjust the brightness of the light source to a preset dimming ratio.

The communication protocol interface circuit 11 obtains an external signal, analyzes the digital signal according to a preset communication protocol, and outputs a control command including a dimming ratio to the controller 14. In addition, the controller 14 also receives a zero-crossing detection signal output by the zero-crossing detection circuit 12, the zero-crossing detection circuit 12 detects the time of the zero-crossing point of the alternating current signal and sends the zero-crossing detection signal to the controller 14 when the alternating current crosses the zero-crossing point, and the controller 14 determines the switching time of each period of the pulse modulation signal according to the zero-crossing detection signal, namely determines the starting time of each period.

The selection switch circuit 13 has a key, and a user can change the state of the selection switch circuit 13 and change the level signal output by the selection switch circuit 13 through the key, thereby realizing the change of the leading edge control and the trailing edge control.

The controller 14 generates a pulse modulation signal according to the dimming control signal output by the communication protocol interface circuit 11, the zero-cross detection signal output by the zero-cross detection circuit 12, and the selection signal output by the selection switch circuit 13, and outputs the pulse modulation signal to the chopper circuit 15, and the chopper circuit 15 chops the alternating current according to the pulse modulation signal and supplies power to the light source serving as a load, thereby adjusting the light emission brightness of the light source.

The power supply circuit 16 receives the alternating current and converts the alternating current into direct current to supply power to the communication protocol interface circuit 11 and the controller 14.

Referring to fig. 4, the communication protocol interface circuit 11 is a DALI communication protocol interface circuit, which includes a signal transmitting terminal DLRX and a signal receiving terminal DLTX, and is further provided with two photo couplers U2 and U4, and two connection terminals DA1 and DA2 of the communication protocol interface circuit 11 are connected to the controller 14 and transmit a dimming controller signal to the controller 14. The communication protocol interface circuit 11 receives an externally transmitted signal through the signal receiving terminal DLTX, and outputs the received signal after passing through the photocoupler U4. Since an external signal may be subjected to an electromagnetic interference or the like to generate an instantaneous high voltage, but since the rated voltage of the controller 14 is usually 5V, if the communication protocol interface circuit 11 outputs an excessively high voltage to the controller 14, the controller 14 may be damaged, and therefore, the external signal is isolated from the dimming control signal received by the controller 14 by the photocoupler U4. Accordingly, signals transmitted from the controller 14 to the outside through the communication protocol interface circuit 11 are also isolated by the photocoupler U2.

Referring to fig. 5, the zero-cross detection circuit 12 includes a photocoupler U7 and a transistor Q10, and two terminals of a light emitting diode of the photocoupler U4 receive voltages of the live line L1 and the neutral line N, respectively. The base of the transistor Q10 is connected to the output of the photo-transistor of the photocoupler U7, and the collector of the transistor Q10 outputs a zero-crossing detection signal to the controller 14.

When the alternating current is not at the zero crossing point, the voltages of the live wire L1 and the zero line N form forward voltage difference at two ends of a light emitting diode of a photoelectric coupler U7, the light emitting diode emits light, a photoelectric triode outputs a high level signal, a collector of a triode Q10 outputs a high level signal, namely at the zero crossing point, and a zero crossing detection signal is a high level signal; on the contrary, at the time of the zero crossing point, the voltage difference between the two ends of the light emitting diode of the photocoupler U7 is small, the light emitting diode is not conducted, and the phototriode outputs a low level signal, so that at the time of the zero crossing point, the zero crossing detection signal is a low level signal. Thus, the controller 14 determines the timing of the zero-crossing of the alternating current according to the change of the high and low levels of the zero-crossing detection signal.

Referring to fig. 6, the selection switch circuit 13 has a switch S1, and the levels of the selection signal KEY output from the selection switch circuit 13 are opposite in both states of on and off of the switch S1. For example, when the switch S1 is closed, the selection signal KEY is a high level signal, and when the switch S1 is open, the selection signal KEY is a low level signal. The two states of switch S1 may represent the manner of leading edge control or trailing edge control, respectively.

Referring to fig. 7, the controller 14 includes a single chip microcomputer U5, two pins of the single chip microcomputer U5 are electrically connected to the communication protocol interface circuit 11, one pin receives the dimming control signal sent by the communication protocol interface circuit 11, and the other pin sends a signal to the communication protocol interface circuit 11. In addition, another pin of the single chip microcomputer U5 receives a selection signal KEY, and another pin receives a zero-crossing detection signal. The single chip microcomputer U5 determines the starting time of each period of the pulse modulation signal according to the zero-crossing detection signal, calculates the duty ratio of the pulse modulation signal according to the dimming control signal, judges whether the control mode currently set by a user is a leading edge control mode or a trailing edge control mode according to the selection signal, and determines the chopping starting time of the pulse modulation signal. The method by which the controller 14 calculates the pulse modulated signal will be described in detail later.

Further, the controller 14 may output a plurality of pulse modulation signals, for example, four pulse modulation signals, i.e., PWM1, PWM2, PWM3, and PWM4, respectively, to the four chopper circuits, so as to control four different light sources. In practical application, one single chip microcomputer can output more paths of pulse modulation signals, so that more light sources are controlled. The light source of the present embodiment may be an incandescent lamp, a fluorescent lamp, a tungsten lamp, or a silicon controlled rectifier dimming power source.

Referring to fig. 8, the chopper circuit 15 receives a pulse modulation signal, such as a PWM1 signal, and receives an ac electrical signal, and chops the ac electrical signal according to the pulse modulation signal. The chopper circuit has a transistor Q14 as a first switching device and a transistor Q16 as a second switching device, and further, a field effect transistor Q2 as a third switching device and a field effect transistor Q3 as a fourth switching device are provided. The transistor Q14 is a high-level conducting switch device, the transistor Q16 is a low-level conducting switch device, and the field-effect transistors Q2 and Q3 are high-level conducting switch devices. In addition, the chopper circuit 15 is provided with a photocoupler U10, a light emitting diode of the photocoupler U10 receives a pulse modulation signal PWM1, and a phototriode outputs a signal to triodes Q14 and Q16.

When the pulse modulation signal is a high level signal, the transistor Q14 is turned on, the transistor Q16 is turned off, at this time, the current output by the +15V dc power supply flows through the transistor Q14, the resistors R37 and R40 form a high level signal, and since the gates (i.e., control ends) of the fets Q2 and Q3 are both connected to the connection of the transistors Q14 and Q16, the fets Q2 and Q3 are both turned on. At this time, the positive half cycle of the alternating current may pass through the live line L and flow through the light source, pass through the light source as a load, and then pass through the field effect transistor Q2; the negative half cycle of the alternating current may pass through the neutral conductor N and through the light source, past the light source as a load, and then through the fet Q3. Thus, when the pulse modulated signal is high, current flows through the light source.

When the pulse modulation signal is a low level signal, the triode Q14 is cut off, the triode Q16 is turned on, at this time, the current output by the direct current power supply cannot flow through the triode Q14, low level signals are formed on the resistors R37 and R40, and the field effect transistors Q2 and Q3 are all cut off. At this time, the ac power cannot pass through the field effect transistors Q2 and Q3 to form a path, and the light source does not have a current flowing therethrough, so that the ac power is chopped.

Referring to fig. 9, the power supply circuit 16 has a rectifier circuit BD4, a voltage stabilization chip U9, and a transformer T4, and the power supply circuit 16 receives alternating current and converts the alternating current into direct current through the rectifier circuit BD4, and further performs voltage stabilization through the voltage stabilization chip U9, and further isolates the voltage through the transformer T4, and outputs stable low-voltage direct current as the direct current power supply VCC.

The embodiment of the working method of the silicon controlled rectifier dimmer based on the communication protocol dimming comprises the following steps:

the operation of the triac dimmer is described below with reference to fig. 10. First, step S1 is executed, in which the communication protocol interface circuit receives an external signal, the signal is a digital signal and includes a dimming control command, such as a dimming ratio control command. And, the communication protocol interface circuit sends the dimming control signal to the controller.

Then, step S2 is performed, the controller receives the zero-cross detection signal and the selection signal, and step S3 is performed, and a corresponding pulse modulation signal is generated according to the dimming control signal, the zero-cross detection signal and the selection signal. Specifically, the controller calculates a period of each pulse modulation signal according to the zero-crossing detection signal, that is, a period of one pulse modulation signal is a time between two adjacent zero-crossing points, that is, each zero-crossing point is a start point of one period of the pulse modulation signal. The dimming control signal is used for calculating a duty ratio of the pulse modulation signal, and specifically, the controller calculates the duty ratio of the pulse modulation signal according to a dimming ratio contained in the dimming control signal, and specifically, the duty ratio of the pulse modulation signal is equal to a value of the dimming ratio contained in the dimming control signal.

The selection signal is used to determine the start of the chopping of the pulse modulated signal, i.e. whether the chopping is started from the leading edge instant or from the trailing edge instant of a cycle. Referring to fig. 11, if the selection signal is characterized by leading edge control for chopping, a low level signal is output at the beginning of one period of the pulse modulation signal, i.e., chopping is started from the leading edge. Referring to fig. 12, if the selection signal is characterized by the trailing-edge control mode for chopping, a high signal is output at the beginning of one period of the pulse modulation signal, and a low signal is output at the latter part of the period, that is, chopping is started from the trailing-edge time. Since the period of the pulse modulation signal is generally fixed, after the start time of one period of the pulse modulation signal is determined and the duty ratio of the period is determined, the duration of the high-level signal and the duration of the low-level signal of the pulse modulation signal in the period can be calculated, so as to determine the waveform of the pulse modulation signal.

Therefore, by arranging the selection switch circuit, a user can determine to use a front edge control mode or a back edge control mode according to actual needs, the same silicon controlled rectifier dimmer can be compatible with two different control modes, the use requirements under different scenes are met, and the compatibility of the silicon controlled rectifier dimmer is better.

Of course, the communication protocol interface circuit of the present invention is not limited to the DALI communication protocol interface circuit, and may also be a bluetooth 5.0Mesh communication protocol interface circuit, a DMX communication protocol interface circuit, or an RDM communication protocol interface circuit, where the circuit shown in fig. 13 is a bluetooth 5.0Mesh communication protocol interface circuit, and the circuit includes a bluetooth 5.0Mesh signal processing chip U6, and converts an external signal into data that can be recognized by the controller 14 through a chip U6. The circuit shown in fig. 14 is a DMX communication protocol interface circuit having a chip U8, and converts an external signal into data that can be recognized by the controller 14 through a chip U8.

Finally, it should be emphasized that the present invention is not limited to the above-described embodiments, such as the change of the specific interface type of the interface circuit of the communication protocol, or the change of the number of the pulse modulation signals output by the controller, etc., and these changes should also be included in the protection scope of the claims of the present invention.