TWI578846B - Control system of light emitting device - Google Patents

Description

Illumination device control system

The present invention relates to a control system, and more particularly to a control system for a light-emitting device.

Artificial light sources that are conventionally used for simulating daylight, such as aquariums, plant factories, etc., typically include a housing, a light emitting diode unit, and a control device. The light-emitting diode unit and the control device are integrated in the casing, and control the brightness of the light-emitting diode unit according to a time and brightness setting table stored in advance by the control device and the current time. For example, the light-emitting diode unit is controlled to be illuminated from 5 pm to 5 pm every day, and the light-emitting diode unit is controlled to emit no light every day from 5 pm to 5 am every other day. The conventional control device determines the current time based on the clock frequency generated by an oscillator.

However, when the plant factory has a large area and a plurality of such conventional artificial light sources are required, each of the artificial light sources individually determines its respective current time according to the oscillator it has. Since each oscillator has an error in its innateness, it will cause a difference in the clock frequency generated by it, and thus there will be an error at the current time determined by each control device. Especially when the artificial light sources are turned on for a long time, The cumulative error at the current time determined by the control device will become larger, so that the opening and closing times of the artificial light sources will become asynchronous, thereby affecting or interfering with the growth of the plant. Therefore, how to provide an artificial light source that is synchronously opened and closed has become an important issue.

Accordingly, it is an object of the present invention to provide a control system for a light-emitting device that is synchronously opened and closed.

Thus, in accordance with one aspect of the present invention, a control system for a light emitting device is provided that is adapted to control N light emitting devices and includes N control devices. N is a positive integer. The N control devices are electrically connected to the N light emitting devices, respectively, and are adapted to be electrically connected to an AC power source. Each control device includes a conversion unit, a drive unit, and a control unit.

The conversion unit is electrically connected to the AC power source to receive an AC voltage input signal and generate an output signal, and the output signal indicates the frequency of the AC voltage input signal.

The driving unit is electrically connected to the corresponding light emitting device, and receives M pulse width modulation signals, and controls the corresponding light emitting device to emit light according to the M pulse width modulation signals, where M is a positive integer.

The control unit includes M current time and duty ratio correspondences, and is electrically connected to the conversion unit to receive the output signal, and determines a current time according to the frequency of the AC voltage input signal indicated by the output signal. And determining, according to the current time and the M correspondences, the duty ratios of the M pulse width modulation signals to generate the M pulse width modulation signals. The frequencies of the M pulse width modulation signals are the same.

In some embodiments, each of the light emitting devices includes M light emitting diode units of the driving unit of the control device corresponding to the electrical connection. The logic value of the M pulse width modulation signals generated by the control unit of each control device varies between a first logic value and a second logic value. The driving unit of each control device respectively controls the illumination of the corresponding two LED units of the illumination device according to the logic values of the M pulse width modulation signals, when the logic value of the pulse width modulation signal is equal to the When the first logic value is used, the driving unit controls the corresponding LED unit to not emit light, and when the logic value of the pulse width modulation signal is equal to the second logic value, the driving unit controls the corresponding LED The unit emits light. When M is greater than 1, the N control devices operate between a first mode and a second mode, and when the N control devices operate in the first mode, the M pulses generated by each control unit The sum of the duty ratios of the wide modulation signals is 100%. When the N control devices operate in the second mode, the sum of the duty ratios of the M pulse width modulation signals generated by each control unit is less than 100%.

In some implementations, the output signal generated by the conversion unit of each control device includes a plurality of consecutive voltage pulses, the period defining each voltage pulse is P1, and the period defining the AC voltage input signal is P2, one of P1/P2 and P2/P1 is a positive integer.

In some implementations, the output powers of the M light emitting diode units of each of the light emitting devices are the same, wherein the AC power source suitable for the electrical connection of the N control devices is a commercial power. The frequency of the AC voltage input signal is one of 50 Hz and 60 Hz. Wherein, the conversion unit of each control device simultaneously receives the AC voltage input signal And the period of the voltage pulses of the output signal generated is the same as the period of the alternating voltage input signal.

In some implementations, the control unit of each control device includes a counter to calculate the number of the voltage pulses of the AC voltage output signal according to the frequency and the logic value of the output signal, thereby generating a Count value. The control unit then determines the current time based on the count value.

Or in some implementations, wherein when M is equal to 2 and the N control devices operate in the first mode, the two pulse width modulated signals generated by the control unit of each control device are complementary to each other. When the logic value of one of the two pulse width modulation signals is the first logic value, the logic value of the other of the two pulse width modulation signals is the second logic value.

Or in some implementations, the two light emitting diode units of each of the light emitting devices are a white light emitting diode and a warm color light emitting diode, wherein the control device is in each of the control devices. The M correspondences are respectively M correspondences of the time of each day and the duty ratio, and the duty ratio corresponding to each day in a first time interval causes the control device to operate in the first mode. The duty cycle corresponding to each day in a second time interval causes the control device to operate in the second mode. The first time interval and the second time interval do not overlap.

According to another aspect of the present invention, a control system for a light emitting device is provided, which is adapted to control N light emitting devices and includes N control devices. N is a positive integer. The N control devices electrically connect the N illuminators The device is suitable for electrically connecting an AC power source. Each control device includes a conversion unit, a drive unit, and a control unit.

The conversion unit is electrically connected to the AC power source to receive an AC voltage input signal and generate an output signal, and the output signal indicates the frequency of the AC voltage input signal.

The driving unit is electrically connected to the corresponding light emitting device, and receives M control signals, and controls corresponding light emitting devices to emit light according to the M control signals, where M is a positive integer.

The control unit includes a correspondence relationship between the M current time and the control signal, and is electrically connected to the conversion unit to receive the output signal, and determines a current time according to the frequency of the AC voltage input signal indicated by the output signal, and then determines a current time. The M control signals are generated according to the current time and the M correspondences.

The effect of the present invention is that the N control devices respectively generate the same output signals according to the AC voltage input signals generated by the same AC power source, and the output signals can indicate the AC voltage input signals. The frequency is further generated according to the output signals to control the illumination of the N light-emitting devices, and the effect of controlling the synchronous opening and closing of the light-emitting devices is achieved.

1‧‧‧Control device

11‧‧‧Conversion unit

12‧‧‧Drive unit

13‧‧‧Control unit

7‧‧‧ switch

8‧‧‧AC power supply

9‧‧‧Lighting device

91‧‧‧First LED unit

92‧‧‧Second light-emitting diode unit

C1‧‧‧First pulse width modulation signal

C2‧‧‧Second pulse width modulation signal

V1‧‧‧cross pressure

Other features and advantages of the present invention will be apparent from the embodiments of the present invention. FIG. 1 is a block diagram illustrating an embodiment of a control system for a light emitting device of the present invention; 2 is a timing diagram illustrating three aspects of a pulse width modulation signal of the embodiment; FIG. 3 is a timing diagram illustrating a percentage and time of an output power of the first light emitting diode of the embodiment. And FIG. 4 is a timing diagram illustrating the percentage of an output power of the second light-emitting diode of one of the embodiments versus time.

Referring to Figure 1, an embodiment of a control system for a lighting device of the present invention is adapted to control N lighting devices 9 and includes N control devices 1. Where N is a positive integer. The N control devices 1 are electrically connected to the N light-emitting devices 9, respectively, and are adapted to be electrically connected to an AC power source 8. Each control device 1 includes a conversion unit 11, a drive unit 12, and a control unit 13. For convenience of explanation, the following is an example of N=2.

The AC power source 8 is a mains supply and outputs an AC voltage input signal having an amplitude of, for example, 50 Hz or 60 Hz and an amplitude of 110 volts or 220 volts. Further, in the present embodiment, the AC power source 8 is connected in series with a switch 7 and in parallel with the two control devices 1. In other embodiments, the AC power source 8, the switch 7, and the two control devices 1 may have other electrical connections. As long as the switch 7 is turned on, the AC power source 8 can be powered simultaneously. The two control devices 1 can be given, except for this.

Each of the light-emitting devices 9 includes M light-emitting diode units of the drive unit 12 of the control device 1 corresponding to the electrical connection, and M is a positive integer. In the embodiment, the M light-emitting diodes of each of the light-emitting devices 9 are single The maximum output power of the elements is the same, for example, both are 10W. For convenience of explanation, taking M=2 as an example, the two LED units defining each of the light-emitting devices 9 are a first light-emitting diode unit 91 and a second light-emitting diode. Unit 92. The first light emitting diode unit 91 is a white light, that is, a light emitting diode (LED) having a color temperature of about 6000K. The second LED unit 92 is a warm color light, that is, a light-emitting diode having a color temperature of about 3000K.

The conversion unit 11 of each control device 1 is electrically connected to the AC power source 8 to receive the AC voltage input signal, and generates an output signal, and the output signal indicates the frequency of the AC voltage input signal.

The driving unit 12 of each control device 1 is electrically connected to the corresponding lighting device 9 and receives M Pulse Width Modulation (PWM) signals, and respectively controls corresponding signals according to the M pulse width modulation signals. The M light emitting diode units of the light emitting device 9 emit light. According to the foregoing description, M=2, the two pulse width modulation signals are defined as a first pulse width modulation signal C1 and a second pulse width modulation signal C2, respectively. That is, the driving unit 12 of each control device 1 respectively controls the corresponding first LEDs of the illumination device 9 according to the first pulse width modulation signal C1 and the second pulse width modulation signal C2. The unit 91 and the second LED unit 92 emit light.

The logic values of the M pulse width modulation signals generated by the control unit 13 of each control device 1 vary between a first logic value and a second logic value. The driving unit 12 of each control device 1 respectively controls the corresponding lighting device 9 according to the logic values of the M pulse width modulation signals The M light emitting diode units emit light. When the logic value of the pulse width modulation signal is equal to the first logic value, the driving unit 12 controls the corresponding LED unit to not emit light. When the logic value of the pulse width modulation signal is equal to the second logic value, the driving unit 12 controls the corresponding light emitting diode unit to emit light. In this embodiment, the first logical value is a logical 0, and the second logical value is a logical one, and in other embodiments, this is not the limit.

The control unit 13 of each control device 1 includes M correspondences of current time and duty ratio, and electrically connects the corresponding conversion unit 11 to receive the output signal, and according to the communication indicated by the output signal The frequency of the voltage input signal determines a current time, and then determines the duty ratios of the M pulse width modulation signals according to the current time and the M correspondences to generate the M pulse width modulation signals. The frequencies of the M pulse width modulation signals are the same.

More specifically, in the present embodiment, when the switch 7 is turned on, the conversion unit 11 of each control device 1 simultaneously receives the AC voltage input signal, and the generated output signal includes a plurality of consecutive voltages. Pulse, the period defining each voltage pulse is P1, and the period defining the AC voltage input signal is P2, then one of P1/P2 and P2/P1 is a positive integer, that is, P1 is an integer multiple of P2, or P2 Is an integer multiple of P1. In this embodiment, the period of the voltage pulse is the same as the period of the alternating voltage input signal. For example, the frequency and amplitude of the AC voltage input signal are 110 Hz at 60 Hz, respectively. The control unit 13 is implemented by a digital IC (1.2 volts), and the conversion unit 11 generates the same. The output signal is, for example, a duty ratio of 50% and a period of 1/60. A pulse signal of two seconds, and the pulse signal varies between 1.2 volts (logic 1) and 0 volts (logic 0), that is, the amplitude of the voltage across the V1 in FIG. 1 is 1.2 volts. The control unit 13 of each control device 1 includes a counter (not shown) to be based on the frequency and logic value of the output signal, for example, Edge Trigger or Level Trigger. The number of the voltage pulses of the AC voltage output signal is calculated to generate a count value, and the control unit 13 determines the current time based on the count value. As described in the previous example, the counter starts counting, for example, from 0. When the count value is equal to 60, it means that the time elapsed from 0 to 60 is 1 second.

In other words, the conversion unit 11 of each control device 1 can simultaneously receive the AC voltage input signal, and the control unit 13 of each control device 1 determines the current time according to the output signal, and each control device The current time determined by the control unit 13 of 1 does not have an error to control the N light-emitting devices 9, that is, the plurality of light-emitting devices 9 are simultaneously turned on or off, thereby overcoming the problems of the prior art. In addition, it should be added that, for example, each control device 1 can obtain the same count value in each counter according to the AC voltage input signal, and then use the same initial time, for example, the switch selects at 22 o'clock. When turned on, each control device 1 also sets the same initial time, 22 points, so that each control device 1 can obtain the same current time. It should be particularly noted that when N is equal to 1, although there is no effect of simultaneously turning on and off a plurality of light-emitting devices 9, the control device 1 can obtain the correct frequency according to the frequency of the AC voltage input signal. The current time, in turn, controls the single illumination device 9 to be turned "on" or "off" at the correct time.

Further, when M is greater than 1, the N control devices 1 operate between a first mode and a second mode. When the N control devices 1 operate in the first mode, the sum of the duty ratios of the M pulse width modulation signals generated by each control unit 13 is 100%. When the N control devices 1 operate in the second mode, the sum of the duty ratios of the M pulse width modulation signals generated by each control unit 13 is less than 100%. More specifically, when the N control devices 1 operate in the first mode, the M light emitting diode units each determine the output power according to the control of the M pulse width modulation signals, that is, each The brightness of the light-emitting diode unit is different, but the total output power of each of the light-emitting devices 9 is equal, that is, the brightness of each of the light-emitting devices 9 is the same, for example, equal to the maximum output power of each of the light-emitting diode units. In contrast, when the N control devices 1 operate in the second mode, the total output power of each of the light-emitting devices 9 may be less than the maximum output power.

In the previous example, N=M=2 is taken as an example. More specifically, when M=2 and the two control devices 1 operate in the first mode, the phases of the two pulse width modulation signals generated by the control unit 13 of each control device 1 are complementary, that is, When the logic value of one of the two pulse width modulation signals is the first logic value, the logic value of the other of the two pulse width modulation signals is the second logic value.

Referring to FIG. 2, for example, if the two control devices 1 are operated in the first mode, and the first pulse width modulation signal C1 is in the first aspect of FIG. 2, and the second pulse width modulation Signal C2 is as in the second aspect of FIG. this When (t2-t0), (t4-t2), and (t6-t4) are equal to the period of the first pulse width modulation signal C1 and the second pulse width modulation signal C2, and the first pulse width The duty ratio of the modulation signal C1 is (t1-t0)/(t2-t0), (t3-t2)/(t4-t2), and (t5-t4)/(t6-t4), the second pulse The duty ratio of the wide modulation signal C2 is (t2-t1)/(t2-t0), (t4-t3)/(t4-t2), and (t6-t5)/(t6-t4), the two The sum of the duty ratios of the pulse width modulation signals is 100%. If the two control devices 1 are operated in the second mode, and the first pulse width modulation signal C1 is in the first aspect of FIG. 2, and the second pulse width modulation signal C2 is in the third state of FIG. kind. At this time, the sum of the duty ratios of the two pulse width modulation signals is less than 100%.

Referring to FIG. 1, the two correspondences in each control device 1 are respectively two correspondences of the time of each day and the duty ratio, and the duty ratio corresponding to each day in a first time interval makes The control device 1 operates in the first mode. The duty cycle corresponding to each day in a second time interval causes the control device 1 to operate in the second mode. The first time interval and the second time interval do not overlap.

In the previous example, N=M=2 is taken as an example. Referring to FIG. 3 again, FIG. 3 is a corresponding relationship between output power and time of the first LED unit 91. The horizontal axis represents time and the vertical axis represents relative output power of the first LED unit 91. The percentage of the maximum output power, for example, if the maximum output power of the first LED unit 91 is 10 W, the percentage corresponding to 9 points is 50%, indicating that the output power at 9 points is 5 W. Similarly, referring to FIG. 4, FIG. 4 is a corresponding relationship between an output power of the second LED unit 92 and time. In FIG. 3 and FIG. 4, the first time interval is between 5 and 18, and the second time interval is 0. Point to 5 o'clock and between 18 o'clock and 24 o'clock. Between 4 o'clock and 7 o'clock and between 17 o'clock and 20 o'clock, each control device 1 controls the corresponding second light-emitting diode unit 92 to emit warm light of different brightness, for example, at 4:30, the first pulse The duty ratio of the wide modulation signal C1 is 0%, the duty ratio of the second pulse width modulation signal C2 is 50%, and the output power of the second LED unit 92 is 50%; Between 14 o'clock, each control device 1 controls the corresponding first LED unit 91 to emit white light of different brightness. For example, at 12 o'clock, the duty ratio of the first pulse width modulation signal C1 is 100%. The duty ratio of the second pulse width modulation signal C2 is 0%, and the output power of the first light emitting diode unit 91 is 100%; between 7:00 and 10:00 and between 14:00 and 17:00, each A control device 1 controls the corresponding first light-emitting diode unit 91 and the second light-emitting diode unit 92 to emit white light of different brightness and warm color light, for example, at 8:30, the first pulse width modulation The duty ratio of the signal C1 is 50%, the duty ratio of the second pulse width modulation signal C2 is 50%, and the first LED unit 91 and the second LED unit 92 are It has a power of 50%; artificial light sources so as to realize a simulated sunlight.

It should be particularly noted that the correspondence between the M current time and the duty ratio of each control unit 13 can obtain a corresponding duty ratio in a software operation manner by using a pre-stored mathematical operation, or Each control unit 13 may also store a comparison table in advance, and obtain the corresponding duty ratio in a manner of finding a value, which is not limited thereto. In addition, in the embodiment, M=2, and the first LED unit 91 and the second LED unit 92 of the illuminating device 9 are respectively a white light and a warm color light emitting diode. . In other embodiments, M can also be other plurals. For example, M=3, the light-emitting device 9 includes three kinds of light-emitting diodes, such as red, blue, and green light-emitting diodes, and is not limited thereto. Further, in the present embodiment, the driving unit 12 controls the light-emitting device 9 to emit light or not according to the duty ratio of the pulse width modulation signal. In other embodiments, the driving unit 12 may also control the light-emitting device 9 to emit light or not according to other kinds of control signals, such as analog control signals, and also achieve the synchronous opening and closing effect of the present invention. .

In summary, the N control devices 1 are all based on the AC voltage input signal generated by the same AC power source 8 to obtain the same frequency of the AC voltage input signal, thereby obtaining the same current time. The effect of controlling the synchronous opening and closing of the N light-emitting devices 9 is achieved. In addition, the control unit 13 of the N control devices 1 respectively determines the M pulse width modulation signals according to the current time and the M correspondences to control the corresponding M light emitting diodes. The luminance of the body unit is such that the object of the present invention can be achieved.

However, the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, that is, the simple equivalent changes and modifications made by the scope of the invention and the contents of the patent specification, All remain within the scope of the invention patent.

1‧‧‧Control device

11‧‧‧Conversion unit

12‧‧‧Drive unit

13‧‧‧Control unit

7‧‧‧ switch

8‧‧‧AC power supply

9‧‧‧Lighting device

91‧‧‧First Light Emitting Diode

92‧‧‧Second light-emitting diode

C1‧‧‧First pulse width modulation signal

C2‧‧‧Second pulse width modulation signal

V1‧‧‧cross pressure

Claims (8)

A control system for a light-emitting device is adapted to control N light-emitting devices, and comprises: N control devices electrically connected to the N light-emitting devices respectively, and is adapted to electrically connect an AC power source, N is a positive integer, and each control device comprises a conversion unit electrically connecting the alternating current power source to receive an alternating voltage input signal and generating an output signal, wherein the output signal indicates a frequency of the alternating voltage input signal, a driving unit electrically connecting the corresponding light emitting device, and receiving M pulse width modulation signals, and controlling corresponding illumination of the illumination device according to the M pulse width modulation signals, M is a positive integer, and a control unit, comprising a correspondence relationship between M current time and duty ratio, and Electrically connecting the conversion unit to receive the output signal, and determining a current time according to the frequency of the AC voltage input signal indicated by the output signal, and determining the M according to the current time and the M correspondences respectively Pulse width modulation signal duty cycle to generate the M pulse width modulation signals, the M pulse width modulation signals have the same frequency The control system of the light-emitting device according to claim 1, wherein each of the light-emitting devices comprises M light-emitting diode units of the drive unit of the control device corresponding to the control device, wherein the control unit of each control device generates The logic values of the M pulse width modulation signals are at a first logic value and a second logic value Between the changes, the driving unit of each control device respectively controls the corresponding light emitting diode units of the light emitting device according to the logic values of the M pulse width modulation signals, when the pulse width modulation signal is When the logic value is equal to the first logic value, the driving unit controls the corresponding LED unit to not emit light, and when the logic value of the pulse width modulation signal is equal to the second logic value, the driving unit controls the corresponding The light emitting diode unit emits light. When M is greater than 1, the N control devices operate between a first mode and a second mode. When the N control devices operate in the first mode, each control unit The sum of the duty ratios of the M pulse width modulation signals generated is 100%, and the M pulse width modulation signals generated by each control unit when the N control devices operate in the second mode The sum of the duty cycles is less than 100%. The control system of the illuminating device of claim 2, wherein the output signal generated by the converting unit of each control device comprises a plurality of consecutive voltage pulses, the period of each voltage pulse is defined as P1, and the alternating current is defined. The period of the voltage input signal is P2, and one of P1/P2 and P2/P1 is a positive integer. The control system of the illuminating device of claim 3, wherein the output power of the M light emitting diode units of each illuminating device is the same, wherein the AC power source suitable for the electrical connection of the N control devices is a commercial power The frequency of the AC voltage input signal is one of 50 Hz and 60 Hz, wherein the conversion unit of each control device is connected at the same time The AC voltage input signal is received, and the period of the voltage pulses of the generated output signal is the same as the period of the AC voltage input signal. The control system of the illuminating device of claim 4, wherein the control unit of each control device includes a counter for calculating the voltage pulses of the AC voltage output signal according to the frequency and the logic value of the output signal. The number is generated to generate a count value, and the control unit determines the current time based on the count value. The control system of the light-emitting device of claim 2, wherein when the M is equal to 2 and the N control devices operate in the first mode, the two pulse width modulations generated by the control unit of each control device The phase of the variable signal is complementary, that is, when the logical value of one of the two pulse width modulated signals is the first logic value, the logical value of the other of the two pulse width modulated signals is the second Logical value. The control system of the illuminating device of claim 6, wherein the two illuminating diode units of each illuminating device are respectively a white light emitting diode and a warm color light emitting diode, wherein each The M correspondences of a control device are respectively M correspondences of the time of each day and the duty ratio, and the duty ratio corresponding to each day in a first time interval causes the control device to operate at the first In one mode, the duty cycle corresponding to each day in a second time interval causes the control device to operate in the second mode, the first time interval and the second time interval not overlapping. A control system for a light-emitting device, suitable for controlling N light-emitting devices, and comprising: N control devices are respectively electrically connected to the N light-emitting devices and are adapted to be electrically connected to an AC power source, N is a positive integer, and each control device comprises a conversion unit electrically connected to the AC power source to receive an AC voltage input signal, and Generating an output signal, and the output signal indicates the frequency of the AC voltage input signal, a driving unit electrically connecting the corresponding light emitting device, and receiving M control signals, and controlling the corresponding light emitting device according to the M control signals Illumination, M is a positive integer, and a control unit, comprising a correspondence between the M current time and the control signal, and electrically connecting the conversion unit to receive the output signal, and according to the AC voltage input signal indicated by the output signal The frequency determines a current time, and then generates the M control signals according to the current time and the M correspondences.