CN112188679B

CN112188679B - DALI (digital addressable lighting interface) bus-based LED (light emitting diode) power supply and output adjusting method and system thereof

Info

Publication number: CN112188679B
Application number: CN202010911964.7A
Authority: CN
Inventors: 王宗友; 王胜利; 邹超洋
Original assignee: Shenzhen Sosen Electronics Co Ltd
Current assignee: Shenzhen Sosen Electronics Co Ltd
Priority date: 2020-09-02
Filing date: 2020-09-02
Publication date: 2023-03-24
Anticipated expiration: 2040-09-02
Also published as: CN112188679A

Abstract

The invention discloses an LED power supply based on a DALI bus and an output adjusting method and system thereof, and relates to the technical field of intelligent lighting control. The LED power output adjusting method based on the DALI bus comprises the following steps: detecting an input signal input to an LED power supply by a DALI bus, converting a first working mode into a maximum output current regulation mode if the input signal is a power frequency alternating current control signal, and converting the first working mode into a DALI dimming mode if the input signal is a DALI control signal; and judging the current first working mode, and if the current working mode is the maximum output current regulation mode, receiving and acquiring the input duration of the power frequency alternating current control signal and regulating the value of the first duty ratio of the output PWM current signal according to the input duration so as to set the maximum output current of the LED power supply. By implementing the technical scheme of the invention, the maximum output current can be set quickly and autonomously only by a proper power frequency alternating current control signal without returning to a power supply manufacturer for modification, so that the cost can be saved and the production efficiency can be improved.

Description

DALI (digital addressable lighting interface) bus-based LED (light emitting diode) power supply and output adjusting method and system thereof

Technical Field

The invention relates to the technical field of intelligent lighting control, in particular to an LED power supply based on a DALI bus and an output adjusting method and system thereof.

Background

Under the background of everything connection, intelligent lighting is a trend of development of the lighting industry and is a necessary way for developing intelligent city lighting. The device based on the DALI (digital addressable lighting interface) standard protocol can be used in combination with a DALI controller, an LED module, a DALI switching device and the like manufactured by any manufacturer, and the output current and the output voltage of the conventional DALI bus-based LED power supply with adjustable maximum output current need to be solidified before leaving a factory, which is not favorable for debugging and modifying an installation site. For example, in practical application, the LED power supply has an adjustable maximum output current within a certain range, if the LED power supply of the same DALI protocol is to be applied to a plurality of different types of LED lamps, the output current and the output voltage of the LED power supply need to be modified, but the existing DALI standard LED power supply is cured before leaving the factory, and the user cannot set the output current and the output voltage of the power supply autonomously, so that the "one machine with multiple purposes" cannot be realized autonomously.

Disclosure of Invention

The invention aims to solve the technical problem of providing an LED power output adjusting method based on a DALI bus aiming at the defects of the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows:

in a first aspect, a method for adjusting an output of an LED power supply based on a DALI bus is provided, which includes:

s1: detecting an input signal input to the LED power supply by the DALI bus, if the input signal is a power frequency alternating current control signal, converting a first working mode into a maximum output current regulation mode, and if the input signal is a DALI control signal, converting the first working mode into a DALI dimming mode;

s2: and judging the current first working mode, receiving and acquiring the input duration of the power frequency alternating current control signal and adjusting the value of the first duty ratio of the output PWM current signal according to the input duration to set the maximum output current of the LED power supply if the current first working mode is the maximum output current adjusting mode.

Further, the maximum output current regulation mode includes a first duty cycle increase mode and a first duty cycle decrease mode;

further, the adjusting the value of the first duty cycle of the output PWM current signal to set the maximum output current of the LED power supply according to the input duration comprises:

s21: if the input duration time meets a first preset condition, switching the current maximum output current regulation mode into a first duty ratio increasing mode or a first duty ratio decreasing mode;

s22: and if the input duration time meets a second preset condition, adjusting the value of the first duty ratio of the output PWM current signal according to a preset value according to a current first duty ratio increasing mode or a current first duty ratio decreasing mode.

Further, the DALI bus-based LED power output adjusting method further comprises the following steps:

s3: obtaining a current table look-up value of the maximum output current corresponding to a current actual value of the first duty ratio according to a one-to-one correspondence list of the value of the first duty ratio and the maximum output current of the LED power supply;

s4: acquiring the output power of the LED power supply, and calculating a current calculated value of the output voltage corresponding to a current table lookup value of the maximum output current according to a constant power output relation;

s5: and acquiring a current calculated value of the duty ratio of the output PWM voltage signal corresponding to the current table look-up value of the output voltage according to the one-to-one correspondence list of the duty ratio of the output PWM voltage signal and the output voltage, and adjusting the current actual value of the duty ratio of the output PWM voltage signal to the current table look-up value of the duty ratio of the output PWM voltage signal.

Further, the DALI bus-based LED power output adjusting method further comprises the following steps: if the current first working mode is a DALI dimming mode, executing steps S1-1 to S1-3;

s1-1: receiving and decoding the DALI control signal to obtain control information;

s1-2: acquiring a current actual value of the first duty ratio and converting the current actual value into one hundred percent to obtain a second duty ratio of the output PWM current signal;

s1-3: and adjusting the value of the second duty ratio according to the control information and outputting the output PWM current signal to set dimming current.

In a second aspect, the invention also constructs an LED power supply based on a DALI bus, comprising a DALI bus interface and a control circuit, which are connected in sequence, the DALI bus interface being connected to the DALI bus; wherein the control circuit comprises:

the first working mode conversion module comprises a signal detection unit for detecting an input signal input to the LED power supply by the DALI bus, and a conversion execution unit for converting a first working mode into a maximum output current regulation mode when the input signal is detected to be a power frequency alternating current control signal and converting the first working mode into a DALI dimming mode when the input signal is detected to be a DALI control signal; and the number of the first and second groups,

the maximum output current adjusting module comprises an input duration acquiring unit and an output PWM current signal processing unit, wherein the input duration acquiring unit is used for judging the current first working mode and receiving and acquiring the input duration of the power frequency alternating current control signal when the current first working mode is the maximum output current adjusting mode, and the output PWM current signal processing unit is used for adjusting the value of the first duty ratio of the output PWM current signal according to the input duration so as to set the maximum output current of the LED power supply.

Further, in the DALI bus based LED power supply provided by the present invention, the maximum output current regulation mode includes a first duty cycle increase mode and a first duty cycle decrease mode; the PWM current signal processing unit includes:

the switching unit is used for switching the current maximum output current regulation mode into a first duty ratio increasing mode or a first duty ratio decreasing mode when the input duration time is judged to meet a first preset condition; and (c) a second step of,

and the first duty ratio adjusting unit is used for adjusting the value of the first duty ratio of the output PWM current signal according to a preset value according to a current first duty ratio increasing mode or a current first duty ratio decreasing mode when the input duration time is judged to meet a second preset condition.

Further, in the DALI bus-based LED power supply provided by the present invention, the control circuit further includes an output voltage adjusting module; the output voltage regulation module includes:

a maximum output current obtaining unit, configured to obtain a current table lookup value of the maximum output current corresponding to a current actual value of the first duty ratio according to a one-to-one correspondence list between the value of the first duty ratio and the maximum output current of the LED power supply;

the output voltage acquisition unit is used for acquiring the output power of the LED power supply and calculating a current calculated value of the output voltage corresponding to the current table lookup value of the maximum output current according to a constant power output relation;

and the output PWM voltage signal adjusting unit is used for acquiring a current table look-up value of the duty ratio of the output PWM voltage signal corresponding to the current calculated value of the output voltage according to the one-to-one correspondence list of the duty ratio of the output PWM voltage signal and the output voltage, and adjusting the current actual value of the duty ratio of the output PWM voltage signal to the current table look-up value of the duty ratio of the output PWM voltage signal.

Further, in the DALI bus-based LED power supply provided by the present invention, the control circuit further includes a DALI dimming module executed when the current first operating mode is the DALI dimming mode; the DALI dimming module includes:

a control information acquisition unit for receiving and decoding the DALI control signal to acquire control information;

the duty ratio conversion unit is used for acquiring the current actual value of the first duty ratio and converting the current actual value into one hundred percent so as to acquire a second duty ratio of the output PWM current signal;

and the second duty ratio adjusting unit is used for adjusting the value of the second duty ratio according to the control information and outputting the PWM current signal to set dimming current.

In a third aspect, the invention further provides an LED power output adjusting system based on a DALI bus, which includes the above LED power based on the DALI bus, and a control device connected to the LED power via the DALI bus for generating a power frequency ac control signal; the control device comprises a voltage transformation circuit and a button for controlling the input duration of the power frequency alternating current control signal input to the LED power supply by the voltage transformation circuit.

Further, in the DALI bus-based LED power output adjusting system provided by the present invention, the system further comprises:

a DALI switch device for generating the DALI control signal and inputting the DALI control signal to the LED power supply to set a dimming current; and/or the presence of a gas in the gas,

and the detection device is used for receiving the maximum output current of the LED power supply so as to display the value or the waveform of the maximum output current in real time.

The method for adjusting the output of the LED power supply based on the DALI bus has the following beneficial effects that: the adjusting method can identify different input signals, enter a corresponding maximum output current adjusting mode or a DALI dimming mode according to the types of the signals, adjust the first duty ratio of the output PWM current signal according to the input duration of the power frequency alternating current control signal in the maximum output current adjusting mode, and directly set the maximum output current due to adjustment of the first duty ratio, so that the maximum output current of the LED power supply can be adjusted by controlling the input duration of the power frequency alternating current control signal, the LED power supply has the field adjusting function of the solidified maximum output current without depending on an upper computer, the output can be quickly and conveniently modified as long as the proper power frequency alternating current control signal is available, a lamp manufacturer can quickly finish the assembly of LED lamps in a specific batch, the LED power supply does not need to be returned to the power supply manufacturer to be modified through upper computer software, the time cost and the transportation cost of lamp assembly are greatly reduced, and the production efficiency is improved.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic diagram of a first embodiment of a DALI bus-based LED power output regulation method provided by the present invention;

FIG. 2 is a schematic diagram of a first duty cycle adjustment method provided by an embodiment of the invention;

fig. 3 is a schematic structural diagram of an LED power output regulating system based on a DALI bus according to an embodiment of the present invention;

fig. 4 is a functional block diagram of the control circuit of fig. 3.

Detailed Description

In order to more clearly understand the technical features, objects and effects of the present invention, the embodiments of the present invention will be described in detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, fig. 1 is a schematic diagram of a first embodiment of an LED power output adjusting method based on a DALI bus according to the present invention, and the adjusting method of the embodiment can be applied to an LED power based on a DALI bus. As shown in fig. 1, in the first embodiment, the adjusting method includes steps S1 and S2.

S1: detecting an input signal input to the LED power supply by the DALI bus, if the input signal is a power frequency alternating current control signal, converting the first working mode into a maximum output current regulation mode, and if the input signal is a DALI control signal, converting the first working mode into a DALI dimming mode.

In step S1, the power frequency ac control signal must be within an acceptable voltage range of the DALI bus, preferably a sine wave or a square wave with a voltage range of 10-22.5V and a frequency of 40-80 Hz, and its low-frequency and low-voltage characteristics make the power frequency ac control signal very easy to obtain and facilitate control of the LED power supply, while the data transmission rate of the DALI control signal is generally 1200bit/S, and the type of the input signal can be detected according to the difference between the frequency and the rate, so that the first operating mode can be switched according to the type of the input signal. The first operating mode is an output current regulation mode of the LED power supply, in which the maximum output current can be modified, and in which the minimum output current (i.e., the dimming current) can be modified. For example, assuming that the solidified maximum output current of the LED power source is 2.5A when the LED power source leaves the factory, the power source manufacturer generally reserves a certain maximum output current adjustment space, such as 2-3A, but cannot modify the output without using an upper computer, and can modify the minimum output current, i.e., the dimming current, of the LED power source in the DALI dimming mode, for example, the current output adjustment of 0-100% (i.e., 0% corresponding to the minimum output current is 0, and 100% corresponding to the minimum output current is 2.5A) is implemented on the basis of the solidified maximum output current being 2.5A, so as to implement the dimming of the lamp. It can be understood that the input signal also includes other signals, such as control data transmitted by the upper computer, in order to avoid mutual interference of the input signals, the input signals cannot be transmitted simultaneously, and when there is no input signal or the input signals are neither the power frequency ac control signal nor the DALI control signal, the step S1 is repeatedly executed.

S2: and judging the current first working mode, if the current first working mode is the maximum output current regulation mode, receiving and acquiring the input duration of the power frequency alternating current control signal, and regulating the value of the first duty ratio of the output PWM current signal according to the input duration to set the maximum output current of the LED power supply.

In step S2, the input duration for obtaining the power frequency ac control signal may be calculated according to the number of times of the effective value of the power frequency ac control signal detected by the LED power supply. Specifically, in this embodiment, the power frequency ac control signal may be subjected to frequency doubling processing through bridge rectification, and then converted into a square wave signal through the comparator, and the frequency of the received square wave signal is used as the counting frequency to trigger interruption and record the interruption as an effective value every time a falling edge or a rising edge of the square wave signal is detected, so that the input duration may be directly calculated according to the accumulation number of times of the effective value and the counting frequency. In this embodiment, the value of the first duty ratio of the output PWM current signal corresponds to the maximum output current one-to-one, and the correspondence may be stored in the LED power supply in a list form, by which it is possible to obtain the desired maximum output current by changing the value of the first duty ratio. For example, the maximum output current is in an adjustable range of 2 to 3A, the value of the first duty ratio is correspondingly 66.7% to 100%, and the embodiment of the present invention does not specifically limit the adjustable range of the maximum output current of the LED power supply.

Further, the maximum output current regulation mode includes a first duty cycle increasing mode and a first duty cycle decreasing mode. Referring to fig. 2, fig. 2 is a schematic diagram of a first duty ratio adjusting method according to the present invention. As shown in fig. 2, in step S2 of the present embodiment, adjusting the value of the first duty ratio of the output PWM current signal according to the input duration to set the maximum output current of the LED power supply 1 includes steps S21 and S22.

S21: and if the input duration time meets a first preset condition, switching the current maximum output current regulation mode into a first duty ratio increasing mode or a first duty ratio decreasing mode.

In this step, the input duration satisfying the first preset condition includes: the input duration is greater than the preset time, or greater than or equal to the preset time, or less than or equal to the preset time, or within the preset time. Preferably, the input duration is greater than a preset time, for example greater than 1s. When a first preset condition is met, if the current maximum output current regulation mode is a first duty ratio increasing mode, the current maximum output current regulation mode is switched to a first duty ratio decreasing mode, otherwise, the current maximum output current regulation mode is switched to the first duty ratio increasing mode, and therefore switching of the first duty ratio regulation mode is achieved.

S22: and if the input duration time meets a second preset condition, adjusting the value of the first duty ratio of the output PWM current signal according to a preset value according to the current first duty ratio increasing mode or the current first duty ratio decreasing mode.

In this step, the input duration satisfying the second preset condition includes: the input duration is greater than the preset time, or greater than or equal to the preset time, or less than or equal to the preset time, or within the preset time. Preferably, the input duration is within a predetermined time, for example, between 0.05 and 1s (which may or may not include 0.05s and/or 1 s). And when a second preset condition is met, if the current maximum output current regulation mode is a first duty ratio increasing mode, increasing the value of the first duty ratio according to a preset numerical value, and otherwise, reducing the value of the first duty ratio according to the preset numerical value. The preset value must be between 0 and 1 and excludes 0 and 1, preferably 1%. The output PWM current signal is a pulse width modulation signal output by an MCU in the LED power supply, and the maximum output current of a mainboard output circuit connected with the MCU is directly controlled by the value of the first duty ratio of the output PWM current signal, so that the maximum output current is set.

The adjustment of the value of the first duty ratio can be realized through the steps S21 and S22, and since the value of the first duty ratio of the output PWM current signal is related to the maximum output current of the LED power supply, the setting of the maximum output current of the LED power supply can be realized by controlling the input duration of the power frequency ac control signal input to the LED power supply, and it can be understood that the first preset condition and the second preset condition are not overlapped with each other.

By implementing the first embodiment provided by the invention, the setting of the maximum output current can be realized by only providing a proper power frequency alternating current control signal for the DALI bus-based LED power supply and controlling the input duration of the power frequency alternating current control signal, so that the LED power supply has the functions of modifying and debugging the solidified maximum output current on site without depending on an upper computer, the LED power supply does not need to be returned to a power supply manufacturer for modification, and the time cost and the transportation cost can be greatly reduced.

The invention also provides a second embodiment of the DALI bus-based LED power output adjusting method, which modifies the output voltage by modifying the duty ratio of the output PWM voltage signal of the MCU to realize constant power output adjustment. Specifically, the present embodiment is different from the first embodiment in that the present embodiment further includes step S3 to step S5, the rest of the present embodiment is the same as the first embodiment, and the description of the same parts is omitted.

S3: and obtaining a current table look-up value of the maximum output current corresponding to the current actual value of the first duty ratio according to the one-to-one correspondence list of the value of the first duty ratio and the maximum output current of the LED power supply.

S4: and acquiring the output power of the LED power supply, and calculating a current calculated value of the output voltage corresponding to a current table lookup value of the maximum output current according to the constant power output relation.

In step S3, the value of the first duty ratio is the duty ratio of the output PWM current signal, there is a one-to-one association relationship between the value and the maximum output current, and the maximum output current lookup table value corresponding to the current actual value of the first duty ratio can be directly obtained through the correspondence relationship list. In step S4, since the maximum output current lookup table value is obtained in step S3, the corresponding output voltage can be calculated according to the constant power output relationship. In step S3, there is a one-to-one correspondence list between the value of the duty ratio of the output PWM voltage signal and the output voltage, a look-up table value of the output PWM voltage signal corresponding to the output voltage obtained in step S4 can be obtained through the correspondence list, and a desired output voltage can be obtained by modifying the current actual value of the duty ratio of the output PWM voltage signal to the obtained look-up table value of the output PWM voltage signal, thereby realizing constant power output.

The second embodiment is implemented to realize the adjustment of the output voltage of the LED power supply based on the DALI bus, so as to realize constant power output, because the LED power supply is constant power output and is generally a constant current source, when the LED lamp is connected to the LED lamp, the LED lamp can be regarded as a load with a certain resistance value, and if the power requirement of the LED lamp is smaller than the maximum output power of the LED power supply, the voltage can be automatically reduced by ohm law when the current maximum output current flows through the load with the known resistance value, so as to realize derating output, so as to adapt to the LED lamp, so that the 'one machine with multiple purposes' can be realized (one DALI bus-based LED power supply is suitable for LED lamps with multiple specifications).

The invention also provides a third embodiment of the method for adjusting the output of the LED power supply based on the DALI bus, which adjusts the value of the second duty ratio of the output PWM current signal by receiving and processing the DALI control signal, thereby realizing the modification of the minimum output current of the LED power supply, namely the dimming current, and realizing the DALI dimming control. The present embodiment is different from the first embodiment or the second embodiment in that it further includes step S1-1 to step S1-3. The rest of this embodiment is the same as the first embodiment or the second embodiment, and the description of the same parts is omitted.

S1-1: the DALI control signal is received and decoded to obtain control information.

S1-2: and acquiring the current actual value of the first duty ratio and converting the current actual value into one hundred percent to obtain a second duty ratio of the output PWM current signal.

S1-3: and adjusting the value of the second duty ratio according to the control information and outputting the output PWM current signal to set the dimming current.

In the present embodiment, the DALI control signal in step S1-1 is manchester encoded, and the dimming control related control information can be acquired by decoding the encoded signal. The second duty ratio in the step S1-2 is obtained by converting the current actual value of the first duty ratio into one hundred percent, so that the adjustment of the value of the second duty ratio in the step S1-3 does not exceed one hundred percent, and the output currents (the maximum output current and the minimum output current) of the LED power supply are directly controlled by the duty ratios (the first duty ratio and the second duty ratio) of the output PWM current signals, so that the adjustment of the minimum output current (i.e., the dimming current) based on the current maximum output current can be realized, that is, the dimming control of the lamp of 0% to 100% is realized.

By implementing the third embodiment, the LED power supply can receive the DALI control signal through the DALI bus to realize the adjustment of 0% to 100% of the lamp brightness, and can receive the power frequency ac control signal through the DALI bus to realize the setting of the maximum output current. When the lamp fails and the lamp is not matched with the LED power supply, the LED power supply can change the maximum output current by receiving a proper power frequency alternating current control signal, so that the maximum output current meets the rated current of a newly-purchased LED lamp, and the power meets the rated power of the lamp at the same time.

A fourth embodiment of the present invention provides a DALI bus-based LED power supply, and in the fourth embodiment, as shown in fig. 3 and 4, the LED power supply 1 includes a DALI bus interface to which a DALI bus is connected, and a control circuit 11, which are connected in sequence. The control circuit 11 includes a first operation mode conversion module 111 and a maximum output current adjustment module 112.

Preferably, the first operation mode conversion module 111 includes a signal detection unit 1111 for detecting an input signal of the DALI bus input to the LED power supply 1, and a conversion execution unit 1112 for converting the first operation mode into the maximum output current adjustment mode when the input signal is detected to be the power frequency ac control signal, and converting the first operation mode into the DALI dimming mode when the input signal is detected to be the DALI control signal. The power frequency alternating current control signal is in a voltage range acceptable by a DALI bus, preferably a sine wave or a square wave with a voltage range of 10-22.5V and a frequency of 40-80 Hz, the power frequency alternating current control signal is easy to obtain due to the low-frequency and low-voltage characteristics of the power frequency alternating current control signal and is convenient for controlling an LED power supply, the data transmission rate of the DALI control signal is generally 1200bit/s, the type of the input signal can be identified according to the difference of the frequency and the rate, and therefore the first working mode can be converted according to the type of the input signal. The first operating mode is an output current regulation mode of the LED power supply, in which the maximum output current can be modified, and in which the minimum output current (i.e., the dimming current) can be modified. For example, the solidified maximum output current of the LED power source is 2.5A when the LED power source leaves a factory, a power source manufacturer generally reserves a certain maximum output current adjusting space such as 2 to 3A, but cannot modify the output without using an upper computer, and the minimum output current of the LED power source can be modified in the DALI dimming mode, for example, the current output adjustment of 0 to 100% (that is, the minimum output current corresponding to 0% is 0, and the minimum output current corresponding to 100% is 2.5A) is realized on the basis that the solidified maximum output current is 2.5A, so as to realize the dimming of the lamp. It can be understood that the input signal also includes other signals, such as control data transmitted by the upper computer, in order to avoid mutual interference of the input signals, the input signals may not be transmitted simultaneously, and when there is no input signal or the input signals are neither the power frequency ac control signal nor the DALI control signal, the first operating mode converting module 111 is repeatedly executed.

It should be noted that, as shown in fig. 3, the output current (including the maximum output current and the minimum output current) of the motherboard output circuit 12 is directly controlled by the duty ratio (including the first duty ratio and the second duty ratio) of the output PWM current signal output by the control circuit 11, and the control circuit 11 includes an MCU and its peripheral circuits, or includes a PLC (programmable logic controller), it can be understood that the PLC is designed based on the MCU, and the functional PLC that the MCU can implement can also implement. Taking the MCU and its peripheral circuits as an example, the MCU includes a first operating mode conversion module 111 and a maximum output current adjustment module 112, the MCU peripheral circuit is used to receive and process the input signal from the DALI bus interface, for example, to rectify the power frequency ac control signal (e.g., a rectifier bridge) and perform waveform conversion processing (via an operational amplifier circuit such as a comparator), and the MCU executes the first operating mode conversion module 111 and the maximum output current adjustment module 112 after receiving the processed power frequency ac control signal.

The maximum output current adjusting module 112 includes an input duration obtaining unit 1121 for determining a current first operating mode and receiving and obtaining an input duration of the power frequency ac control signal when the current first operating mode is the maximum output current adjusting mode, and an output PWM current signal processing unit 1122 for adjusting a value of a first duty ratio of the output PWM current signal according to the input duration to set a maximum output current of the LED power supply 1.

The input duration for obtaining the power frequency alternating current control signal can be calculated according to the number of times of the effective value of the detected power frequency alternating current control signal, specifically, in this embodiment, the power frequency alternating current control signal can be subjected to frequency doubling processing through bridge rectification by an MCU peripheral circuit, and then converted into a square wave signal by a comparator, so that the MCU triggers interruption and records the interruption as an effective value every time the falling edge or the rising edge of the square wave signal is detected with the frequency of the received square wave signal as the counting frequency, and the input duration can be directly calculated according to the accumulated number of times of the effective value and the counting frequency. In this embodiment, the value of the first duty ratio of the output PWM current signal of the MCU corresponds to the maximum output current one-to-one, the correspondence may be stored in the LED power supply in a list form, and by the correspondence list, it is possible to change the value of the first duty ratio to obtain the desired maximum output current. For example, the maximum output current is in an adjustable range of 2 to 3A, the value of the first duty ratio is correspondingly 66.7% to 100%, and the embodiment of the present invention does not specifically limit the adjustable range of the maximum output current of the LED power supply.

Further, the control circuit 11 is exemplified by the MCU and its peripheral circuits, and in the fourth embodiment, referring to fig. 4, the maximum output current regulation mode of the MCU includes a first duty ratio increasing mode and a first duty ratio decreasing mode. Preferably, the PWM current signal processing unit in the maximum output current adjusting module 112 includes a switching unit 11221 and a first duty ratio adjusting unit.

The switching unit 11221 is configured to switch the current maximum output current regulation mode to the first duty ratio increase mode or the first duty ratio decrease mode when it is determined that the input duration time satisfies the first preset condition. Wherein the input duration satisfying the first preset condition includes: the input duration is greater than the preset time, or greater than or equal to the preset time, or less than or equal to the preset time, or within the preset time. Preferably, the input duration is greater than a preset time, for example greater than 1s. When a first preset condition is met, if the current maximum output current regulation mode is a first duty ratio increasing mode, the current maximum output current regulation mode is switched to a first duty ratio decreasing mode, otherwise, the current maximum output current regulation mode is switched to the first duty ratio increasing mode, and therefore switching of the first duty ratio regulation mode is achieved.

Referring to fig. 3 and 4, the first duty ratio adjusting unit 11222 is configured to adjust a value of the first duty ratio of the output PWM current signal by a preset value according to the current first duty ratio increasing mode or the first duty ratio decreasing mode when it is determined that the input duration satisfies the second preset condition. Wherein the input duration satisfying the second preset condition includes: the input duration is greater than the preset time, or greater than or equal to the preset time, or less than or equal to the preset time, or within the preset time. Preferably, the input duration is within a predetermined time, for example, between 0.05 and 1s (which may or may not include 0.05s and/or 1 s). And when a second preset condition is met, if the current maximum output current regulation mode is a first duty ratio increasing mode, increasing the value of the first duty ratio according to a preset numerical value, and otherwise, reducing the value of the first duty ratio according to the preset numerical value. The preset value must be between 0 and 1 and does not include 0 and 1, preferably 1%. The output PWM current signal (IPWM in fig. 3) is a pulse width modulation signal output by the MCU inside the LED power supply, and the maximum output current of the main board output circuit 12 connected to the MCU is directly controlled by the value of the first duty ratio of the output PWM current signal, thereby realizing the setting of the maximum output current.

The adjustment of the value of the first duty ratio can be realized by the switching unit 11221 and the first duty ratio adjusting unit 11222, and it can be understood that the first preset condition and the second preset condition must not coincide with each other.

By implementing the fourth embodiment provided by the invention, the maximum output current can be adjusted by only providing a proper power frequency alternating current control signal for the DALI bus-based LED power supply and controlling the input duration of the power frequency alternating current control signal, so that the LED power supply has the functions of on-site adjustment and setting of the solidified maximum output current without depending on an upper computer, the LED power supply 1 does not need to be returned to a power supply manufacturer for modification, and the time cost and the transportation cost can be greatly reduced.

A fifth embodiment of the present invention provides another DALI bus based LED power supply that modifies the output voltage by modifying the duty cycle of the output PWM voltage signal to achieve constant power output regulation. In the fifth embodiment, the difference from the fourth embodiment is that the DALI bus-based LED power supply 1 further includes an output voltage adjusting module 113, and further, the output voltage adjusting module 113 includes a maximum output current obtaining unit 1131, an output voltage obtaining unit 1132 and an output PWM voltage signal adjusting unit 1133. The rest of this embodiment is the same as the fourth embodiment, and the same description is omitted.

The maximum output current obtaining unit 1131 is configured to obtain a current lookup table value of the maximum output current corresponding to the current actual value of the first duty ratio according to a one-to-one correspondence list between the value of the first duty ratio and the maximum output current of the LED power supply 1. The output voltage acquiring unit 1132 is configured to acquire the output power of the LED power supply 1 and calculate a current calculated value of the output voltage corresponding to the current lookup table value of the maximum output current according to the constant power output relationship. The output PWM voltage signal adjusting unit 1133 is configured to obtain a current table lookup value of the duty ratio of the output PWM voltage signal corresponding to the current calculated value of the output voltage according to the one-to-one correspondence list between the value of the duty ratio of the output PWM voltage signal and the output voltage, and adjust the current actual value of the duty ratio of the output PWM voltage signal to the current table lookup value of the duty ratio of the output PWM voltage signal, so as to obtain the desired output voltage, thereby implementing constant power output. It can be understood that the output PWM voltage signal (VPWM in fig. 3) may be a pulse width modulation signal output by the MCU in the control circuit 11, or may be a signal generated by an output PWM voltage signal generating circuit (not integrated in the MCU) in the control circuit 11, and the output voltage of the motherboard output circuit 12 is directly controlled by the value of the duty ratio of the output PWM voltage signal, and is recorded as a one-to-one correspondence list through the association relationship and stored in the MCU.

In the maximum output current obtaining unit 1131, the value of the first duty ratio is a duty ratio of the output PWM current signal, and there is a one-to-one association relationship between the value and the maximum output current, and the maximum output current lookup table value corresponding to the current actual value of the first duty ratio can be directly obtained through the correspondence relationship list. It can be understood that, since the maximum output current output by the main board circuit 12 is directly controlled by the value of the first duty ratio of the output PWM current signal output by the MCU in the control circuit 11, the one-to-one correspondence relationship list between the value of the first duty ratio and the maximum output current of the LED power supply may be recorded and stored in advance. In the output voltage obtaining unit 1132, since the output PWM voltage signal adjusting unit 1133 has obtained the maximum output current look-up table value, the corresponding output voltage can be calculated according to the constant power output relationship. In the output PWM voltage signal adjusting unit 1133, there is a one-to-one correspondence list between the duty ratio value of the output PWM voltage signal and the output voltage, a look-up table value of the output PWM voltage signal corresponding to the output voltage acquired by the output voltage acquiring unit 1132 may be obtained through the correspondence list, and a desired output voltage may be obtained by modifying the current actual value of the duty ratio of the output PWM voltage signal into the obtained look-up table value of the output PWM voltage signal, thereby implementing constant power output.

The fifth embodiment is implemented to realize the adjustment of the output voltage of the LED power supply based on the DALI bus, thereby realizing constant power output, because the LED power supply is constant power output and is generally a constant current source, when the LED lamp is connected, the LED lamp can be regarded as a load with a certain resistance value, and if the power requirement of the LED lamp is smaller than the maximum output power of the LED power supply, the current maximum output current can automatically realize voltage reduction by ohm's law when flowing through the load with the known resistance value, thereby realizing derated output to adapt to the LED lamp, thereby realizing ' one machine with multiple purposes ' (one DALI bus-based LED power supply is suitable for various LED lamps with different specifications), and ' user independent setting '. It should be noted that, after the DALI bus-based LED power supply receives the power frequency ac control signal and sets the maximum output current, the output voltage is simultaneously set according to the constant power output relationship, which is the product of the output current and the output voltage is constant, and of course, due to the constant current output, the actual output voltage and the regulated output voltage are not necessarily the same according to the difference of the load.

Referring to fig. 4, a sixth embodiment of the present invention provides another DALI bus-based LED power supply, and this embodiment further adjusts a minimum output current, i.e., a dimming current, of the LED power supply on the basis of the fourth embodiment or the fifth embodiment, so as to implement DALI dimming control. In a sixth embodiment, the DALI bus based LED power supply further includes a DALI dimming module 114 that is executed when the current first operation mode is the DALI dimming mode. Preferably, the DALI dimming module 114 includes a control information acquisition unit 1141, a duty ratio conversion unit 1142, and a second duty ratio adjustment unit 1143.

The control information acquisition unit 1141 is configured to receive and decode the DALI control signal to acquire control information. The duty ratio conversion unit 1142 is configured to obtain a current actual value of the first duty ratio and convert the current actual value into one hundred percent to obtain a second duty ratio of the output PWM current signal. The second duty ratio adjusting unit 1143 is configured to adjust a value of the second duty ratio according to the control information and output a PWM current signal to set the dimming current.

In this embodiment, the DALI control signal in the control information acquiring unit 1141 is manchester encoded, and the dimming control related control information can be acquired by decoding the encoded signal. The second duty ratio in the duty ratio conversion unit 1142 is obtained by converting the current actual value of the first duty ratio into one hundred percent, so that the second duty ratio adjustment unit 1143 does not adjust the value of the second duty ratio by more than one hundred percent, and the output current of the LED power supply is directly controlled by the duty ratio of the output PWM current signal, so that the adjustment of the minimum output current, i.e., the dimming current, based on the current maximum output current can be realized, i.e., the lamp dimming control of 0% to 100% is realized.

By implementing the sixth embodiment, after the lamp manufacturer finishes assembling the LED power supply and the LED lamp based on the DALI bus, the LED power supply can receive the DALI control signal through the DALI bus to realize the adjustment of 0% to 100% of the lamp brightness, and can receive the power frequency alternating current control signal through the DALI bus to realize the setting of the maximum output current. When the lamp fails and the lamp adaptive to the LED power supply is not available, the LED power supply can change the maximum output current by receiving a proper power frequency alternating current control signal, so that the maximum output current meets the rated current of a newly purchased LED lamp, and the power meets the rated power of the lamp at the same time.

Regarding the first duty ratio and the second duty ratio of the output PWM current signal in the above embodiment, it should be noted that the minimum value and the maximum value of the first duty ratio respectively correspond to the minimum value and the maximum value of the adjustable range of the maximum output current of the LED power supply, and the values therebetween also correspond to each other, for example, the first duty ratio is 66.7% -100% corresponding to the maximum output current of 2-3A, since the value of the second duty ratio is obtained by converting the current value of the current first duty ratio to one hundred percent and then adjusting the DALI control signal, and the MCU can record the current value of the first duty ratio, the current value of the first duty ratio is known, even if the user performs DALI dimming control on the LED power supply (that is, the current value of the second duty ratio is no longer 100%), when the maximum output current needs to be set, the LED power supply can obtain the current value of the first duty ratio of the output PWM current signal, so that the current value of the first duty ratio can be directly adjusted to realize the maximum output current adjustment, and the maximum output current of the LED power supply cannot be set because of the DALI dimming is performed.

Referring to fig. 3, a seventh embodiment of the present invention provides a DALI bus-based LED power output regulation system. The system comprises the DALI bus-based LED power supply 1 of any one of the fourth, fifth or sixth embodiments, and a control device 2 connected to the LED power supply 1 via the DALI bus for generating a power frequency AC control signal. Preferably, the ac control device 2 includes a voltage transformation circuit and a button for controlling the input duration of the power frequency ac control signal input from the voltage transformation circuit to the LED power supply 1.

The control device 2 is simple in structure and low in cost, the simple control device 2 can obtain a receivable power frequency alternating current control signal meeting the requirements of the DALI bus, the input duration of the power frequency alternating current control signal input to the LED power supply can be controlled through the buttons on the control device, and therefore the setting of the maximum output current and the setting of the output voltage are achieved, the LED power supply based on the DALI bus is suitable for LED lamps of various specifications, when a lamp manufacturer produces LED lamps of a specific batch, lamp assembly can be rapidly completed through the simple control device 2, the maximum output current of the LED power supply does not need to be returned to the LED power supply manufacturer to modify, and time cost and transportation cost are effectively reduced.

Referring to fig. 3, an eighth embodiment of the present invention provides another DALI bus-based LED power output adjusting system, which is different from the seventh embodiment in that the adjusting system further includes a DALI switching device 3 for generating a DALI control signal and inputting the DALI control signal to the LED power supply 1 to set a dimming current and/or a detecting device 4 for receiving a maximum output current of the LED power supply 1 to display a value or waveform of the maximum output current in real time. Thus, the DALI switch device 3 is mounted on the DALI bus, the generated DALI control signal can transmit the value LED power source 1 through the DALI bus, and the output end of the detection device 4 connected to the LED power source can detect the output current (including the maximum output current and the minimum output current) of the motherboard output circuit.

When the adjusting system comprises the LED power supply 1, the control device 2 and the DALI switching device 3, DALI dimming control by a DALI control signal can be achieved. The DALI switch device can be an existing switch device with an internal integrated circuit, and different DALI control signals can be sent out through different pressing times to realize dimming of the LED lamp, so that the setting of the minimum output current of the LED power supply, namely the dimming current is realized. For example, one press changes from light-off (0% brightness) to 100% brightness, another press changes to light-off, and another press changes to 50% brightness.

When the regulating system comprises the LED power supply 1, the control device 2 and the detection device 4, the maximum output current of the LED power supply can be set by the value or waveform of the output current detected by the detection device. When the maximum output current is set, the maximum output current can be set by controlling the input duration of the power frequency ac control signal to change the current value of the first duty ratio, so that the detection device 4 can know whether the required parameters such as the value of the maximum output current and the output power are set.

When the regulating system comprises the above-mentioned LED power supply 1, control device 2, DALI switching device 3 and detection device 4, regulation of the maximum output current, regulation of the minimum output current (i.e. dimming current), real-time detection of the output current can be achieved. It should be noted that, since the current value of the first duty ratio needs to be converted to 100% before the value of the second duty ratio is adjusted, the LED power source can record the value of the first duty ratio before the conversion, and even if the user performs the maximum output current adjustment after DALI dimming (the value of the second duty ratio is no longer 100%), the user can still modify the current value of the first duty ratio by controlling the input duration of the control signal to adjust and set the maximum output current, and the detection device 4 can detect the current value or waveform of the maximum output current to assist in adjusting the current maximum output current. Of course, the detection device 4 may detect the value or waveform of the output current after dimming (i.e., the dimming current as the minimum output current) when the current needs to be detected, so as to meet the user's demand.

In the above embodiment, the power frequency ac control signal and the DALI control signal are both input from the DALI bus interface of the LED power supply 1 through the DALI bus and are input from the same pin of the MCU in the control circuit 11, and thus, the hardware part of the DALI bus-based LED power supply provided in the above embodiment is not itself improved, and thus, the hardware cost of the LED power supply does not need to be increased. In some embodiments, the LED power supply may be modified by hardware to change the transmission mode, processing mode, etc. of the input signal, for example, the control device and/or the detection device may be integrated into the LED power supply based on the DALI bus, and the power frequency ac control signal and the DALI control signal may be input from different MCU pins.

By implementing the embodiment provided by the invention, the common LED power supply based on the DALI protocol has a quick and convenient output current regulation function, the hardware cost is not increased, the output current and the output voltage of the LED power supply can be conveniently modified by using simple equipment (the control device 12) on a construction site, so that the LED power supply of the same DALI protocol can be applied to LEDs of various types, the functions of 'one machine for multiple purposes' and 'user self-setting' are realized, and the DALI bus-based LED power supply has an actual application value.

While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from its scope. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

1. A DALI bus-based LED power output adjusting method is characterized by comprising the following steps:

s1: detecting an input signal input to the LED power supply by the DALI bus, if the input signal is a power frequency alternating current control signal, converting a first working mode into a maximum output current regulation mode, and if the input signal is a DALI control signal, converting the first working mode into a DALI dimming mode; wherein the maximum output current regulation mode comprises a first duty cycle increase mode and a first duty cycle decrease mode;

s2: judging the current first working mode, if the current first working mode is the maximum output current regulation mode, receiving and acquiring the input duration of the power frequency alternating current control signal, and regulating the value of the first duty ratio of the output PWM current signal according to the input duration to set the maximum output current of the LED power supply;

the adjusting a value of a first duty cycle of an output PWM current signal to set a maximum output current of the LED power supply according to the input duration comprises:

2. The DALI bus based LED power supply output adjustment method of claim 1, further comprising:

3. The DALI bus-based LED power output adjustment method as claimed in claim 1 or 2, wherein if the current first operating mode is a DALI dimming mode, steps S1-1 to S1-3 are performed;

4. The DALI bus-based LED power supply is characterized by comprising a DALI bus interface and a control circuit (11), wherein the DALI bus interface is connected with the DALI bus and the control circuit is sequentially connected with the DALI bus; wherein the control circuit (11) comprises:

a first operation mode conversion module (111) including a signal detection unit (1111) for detecting an input signal inputted to the LED power supply (1) from the DALI bus, and a conversion execution unit (1112) for converting the first operation mode into a maximum output current adjustment mode when the input signal is detected to be a power frequency ac control signal, and converting the first operation mode into a DALI dimming mode when the input signal is detected to be a DALI control signal; wherein the maximum output current regulation mode comprises a first duty cycle increasing mode and a first duty cycle decreasing mode; and the number of the first and second groups,

the maximum output current adjusting module (112) comprises an input duration acquiring unit (1121) for judging the current first working mode and receiving and acquiring the input duration of the power frequency alternating current control signal when the current first working mode is the maximum output current adjusting mode, and an output PWM current signal processing unit (1122) for adjusting the value of the first duty ratio of the output PWM current signal according to the input duration to set the maximum output current of the LED power supply (1);

the PWM current signal processing unit (1122) includes:

a switching unit (11221) configured to switch the current maximum output current regulation mode to a first duty ratio increase mode or a first duty ratio decrease mode when it is determined that the input duration satisfies a first preset condition; and the number of the first and second groups,

a first duty cycle adjustment unit (11222) for adjusting the value of the first duty cycle of the output PWM current signal by a preset value according to a current first duty cycle increasing mode or first duty cycle decreasing mode when it is determined that the input duration satisfies a second preset condition.

5. The DALI bus based LED power supply according to claim 4, characterized in that the control circuit (11) further comprises an output voltage regulating module (113); the output voltage regulation module (113) comprises:

a maximum output current obtaining unit (1131) configured to obtain a current table lookup value of the maximum output current corresponding to a current actual value of the first duty ratio according to a one-to-one correspondence list between the value of the first duty ratio and the maximum output current of the LED power supply (1);

the output voltage acquisition unit (1132) is used for acquiring the output power of the LED power supply (1) and calculating a current calculated value of the output voltage corresponding to a current table look-up value of the maximum output current according to a constant power output relation;

and the output PWM voltage signal adjusting unit (1133) is used for acquiring a current table lookup value of the duty ratio of the output PWM voltage signal corresponding to the current calculated value of the output voltage according to the one-to-one correspondence list of the duty ratio of the output PWM voltage signal and the output voltage, and adjusting the current actual value of the duty ratio of the output PWM voltage signal to the current table lookup value of the duty ratio of the output PWM voltage signal.

6. The DALI bus based LED power supply according to claim 4 or 5, characterized in that the control circuit (11) further comprises a DALI dimming module (114) executed when the current first operation mode is the DALI dimming mode; the DALI dimming module (114) comprises:

a control information acquisition unit (1141) for receiving and decoding the DALI control signal to acquire control information;

a duty ratio conversion unit (1142) for obtaining a current actual value of the first duty ratio and converting the current actual value into one hundred percent to obtain a second duty ratio of the output PWM current signal;

and the second duty ratio adjusting unit (1143) is used for adjusting the value of the second duty ratio according to the control information and outputting the PWM current signal to set dimming current.

7. A DALI bus based LED power supply output regulation system comprising a DALI bus based LED power supply (1) according to any one of claims 4 to 6, and a control device (2) connected to the LED power supply (1) via the DALI bus for generating a power frequency ac control signal; the control device (2) comprises a transformation circuit (21) and a button (22) for controlling the input duration of the power frequency alternating current control signal input to the LED power supply (1) by the transformation circuit (21).

8. The DALI bus based LED power supply output regulation system of claim 7, further comprising:

a DALI switch device (3) for generating the DALI control signal and inputting to the LED power supply (1) to set a dimming current; and/or the presence of a gas in the gas,

and the detection device (4) is used for receiving the maximum output current of the LED power supply (1) so as to display the value or the waveform of the maximum output current in real time.