TWI437920B - Light source controller capable of selecting illumination modes of a light source by utilizing a power switch and control system thereof - Google Patents

Description

Light source controller for selecting light source illumination mode by using power switch and illumination system thereof

The invention relates to a light source controller, in particular to a light source controller for selecting a light source illumination mode by using a power switch.

Please refer to FIG. 1 and FIG. 2 simultaneously. FIG. 1 is a schematic diagram of a conventional illumination system 100, and FIG. 2 is a schematic diagram of a related signal of the illumination system 100 of FIG. The lighting system 100 includes a power switch 110 and a plurality of lighting devices 120 electrically connected to the power switch 110. Each lighting device 120 includes at least one light source 122, a power converter 124, a power voltage sensor 126, and a microcontroller 128. The power converter 124 is configured to convert an AC power source Vac into a DC power source Vdc to provide power to the lighting device 120. The power voltage sensor 126 is configured to sense the voltage level of the DC power source Vdc generated by the power converter 124. The microcontroller 128 is electrically connected to the power converter 124 and the power voltage sensor 126. The microcontroller 128 is configured to select the illumination mode of the light source 122 according to the opening and closing of the power switch 110. For example, as shown in FIG. 2, the microcontroller 128 can set a reference voltage level Vref when the voltage level of the DC power supply Vdc measured by the power supply voltage sensor 126 is higher than the reference voltage level Vref. The microcontroller 128 determines that the power switch 110 has been turned on, and when the voltage level of the DC power source Vdc measured by the power voltage sensor 126 is lower than the reference voltage level Vref, the microcontroller 128 determines the power switch. 110 has been closed. The microcontroller 128 further determines one of the first time T1 when the voltage level of the DC power source Vdc reaches the reference voltage level Vref after the power switch 110 is turned off, and then the voltage level of the DC power source Vdc after the power switch 110 is turned on reaches the reference. At one of the voltage levels Vref, the second time T2 determines whether the illumination mode of the light source 122 has to be changed. If the difference between the first time T1 and the second time T2 is less than a predetermined value, the controller 128 will switch the illumination mode of the light source 122 on behalf of the user to deliberately turn off and turn on the power switch 110. If the difference between the first time T1 and the second time T2 is greater than a predetermined value, the user 128 simply turns off the power switch 110 and turns on the power switch 110, the microcontroller 128 does not change the light source 122. Lighting mode.

However, due to differences in circuit configuration or electronic components, the first time T1 when the voltage level of the DC power supply Vdc of each illumination device 120 reaches the reference voltage level Vref will be different after the power switch 110 is turned off, so each The difference between the first time T1 and the second time T2 of the lighting device 120 will be different. The above situation will cause the illumination device 120 of the illumination system 100 to misjudge whether or not to change the illumination mode of the light source 122, thereby making the illumination mode of the illumination device 120 of the illumination system 100 inconsistent.

The present invention provides a light source controller including a clock signal generator for generating a clock signal when a voltage level of an AC power source reaches a first voltage level; and a power converter for converting the AC power source into a DC power supply; a power supply voltage sensor for sensing a voltage level of the DC power supply; and a microcontroller electrically coupled to the clock signal generator and the power supply voltage sensor, the microcontroller Selecting a light source according to one of the first time when the last clock signal is generated before the power switch is turned off, and the voltage level of the DC power source reaches a second voltage level after the power switch is turned on. Lighting mode.

The invention further provides an illumination system comprising a power switch and a plurality of illumination devices electrically connected to the power switch. Each lighting device includes at least one light source; a clock signal generator for generating a clock signal when a voltage level of an AC power source reaches a first voltage level; and a power converter for converting the AC power source into a DC power supply; a power supply voltage sensor for sensing a voltage level of the DC power supply; and a microcontroller electrically coupled to the clock signal generator and the power supply voltage sensor, the microcontroller Selecting at least one of the second time when the voltage level of the DC power source reaches a second voltage level after the power switch is turned on according to the first time pulse signal before the power switch is turned off. The lighting mode of the light source.

Compared with the prior art, the light source controller and the illumination system of the present invention can use the clock signal generated by the clock signal generator to more accurately select the illumination mode of the light source according to the opening and closing of the power switch, so that all the illumination systems are made. The illumination device can consistently change the illumination mode.

Please also refer to Figures 3 and 4. 3 is a schematic diagram of the illumination system 200 of the present invention, and FIG. 4 is a schematic diagram of the related signals of the illumination system 200 of FIG. The lighting system 200 includes a power switch 210 and a plurality of lighting devices 220 electrically connected to the power switch 210. Each lighting device 220 includes at least one light source 222 and a light source controller 221 . The light source controller 221 includes a clock signal generator 223, a power converter 224, a power voltage sensor 226, and a microcontroller 228. The clock signal generator 223 is configured to generate a clock signal clk when the voltage level of the AC power source Vac reaches 0 volts (or reach other voltage levels). Since each lighting device 220 is electrically connected to the same AC power source Vac, Moreover, the AC power supply Vac has a fixed frequency (for example, 60 Hz), so the frequency and generation time of the clock signal clk of each illumination device 220 will be the same. The power converter 224 is configured to convert the AC power supply Vac into a DC power source Vdc to provide the illumination device 220 power. The power voltage sensor 226 is configured to sense the voltage level of the DC power source Vdc generated by the power converter 224. The microcontroller 228 is electrically coupled to the clock signal generator 223 and the power supply voltage sensor 226.

By the clock signal clk generated by the clock signal generator 223, the microcontroller 228 of the present invention can more accurately select the illumination mode of the light source 222 according to the opening and closing of the power switch 210. For example, since the frequency and the generation time of the clock signal clk of each illumination device 220 are the same, the microcontroller 228 can determine whether the power switch 210 is turned off according to whether the clock signal clk is interrupted. The microcontroller 228 can further set a reference voltage level Vref for determining that the power switch 210 has been used when the voltage level of the DC power supply Vdc measured by the power supply voltage sensor 226 is higher than the reference voltage level Vref. Open. The microcontroller 228 then selects one of the first time T1 when the last clock signal clk is generated before the power switch 210 is turned off, and then one of the voltage levels of the DC power source Vdc after the power switch 210 is turned on to reach the reference voltage level Vref. The second time T2 determines whether the illumination mode of the light source 222 has to be changed. If the difference between the first time T1 and the second time T2 is less than a predetermined value, the microcontroller 228 switches the illumination mode of the light source 222 on behalf of the user to deliberately turn off and turn on the power switch 210. If the difference between the first time T1 and the second time T2 is greater than a predetermined value, the user 222 simply does not turn off the power switch 210 and turns on the power switch 210, and the microcontroller 228 does not change the light source 222. Lighting mode.

According to the above configuration, each lighting device 220 has the same time T1 when the last clock signal clk is generated before the power switch 210 is turned off, so that the first time T1 and the second time T2 of each lighting device 220 can be improved. The error between the gaps, and thus the illumination system 200 of the present invention can more accurately select the illumination mode of the light source 222 according to the opening and closing of the power switch 210, and is less prone to misjudgment by the partial illumination device 220, resulting in illumination. The illumination modes of illumination device 220 of system 200 are inconsistent.

In addition, the light source controller 221 can further include a capacitor 225 or other energy storage component electrically coupled to the microcontroller 228 for providing power to the microcontroller 228 when the power switch 210 is turned off. The light source 222 can be a light emitting diode, and the light source 222 can even include a plurality of color light emitting diodes.

Compared with the prior art, the light source controller and the illumination system of the present invention can use the clock signal generated by the clock signal generator to more accurately select the illumination mode of the light source according to the opening and closing of the power switch, so that all the illumination systems are made. The illumination device can consistently change the illumination mode.

The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

100,200. . . Lighting system

110,210. . . switch

120,220. . . Lighting device

122,222. . . light source

124,224. . . Power converter

126,226. . . Power supply voltage sensor

128,228. . . Microcontroller

221. . . Light source controller

223. . . Clock signal generator

225. . . capacitance

Vac. . . AC power

Vdc. . . DC power supply

Vref. . . Reference voltage level

Clk. . . Clock signal

Figure 1 is a schematic diagram of a conventional illumination system.

Figure 2 is a schematic diagram of the relevant signals of the illumination system of Figure 1.

Figure 3 is a schematic illustration of the illumination system of the present invention.

Figure 4 is a schematic diagram of the relevant signals of the illumination system of Figure 3.

200. . . Lighting system

210. . . switch

220. . . Lighting device

221. . . Light source controller

222. . . light source

223. . . Clock signal generator

224. . . Power converter

225. . . capacitance

226. . . Power supply voltage sensor

228. . . Microcontroller

Claims (10)

A light source controller for selecting a light source illumination mode by using a power switch, comprising: a clock signal generator for generating a clock signal when a voltage level of an AC power source reaches a first voltage level; and a power converter for Converting the AC power to a DC power source; a power voltage sensor for sensing a voltage level of the DC power source; and a microcontroller electrically connected to the clock signal generator and the power voltage sensing The microcontroller is configured to use one of the first time after the power switch is turned off, and the voltage level of the DC power source to reach a second voltage level after the power switch is turned on. The second time selects the illumination mode of a light source. The light source controller of claim 1, wherein the microcontroller is configured to select an illumination mode of the light source when a difference between the first time and the second time is less than a predetermined value. The light source controller of claim 1, further comprising a capacitor electrically connected to the microcontroller. The light source controller of claim 1, wherein the light source comprises a plurality of colors of light emitting diodes. The light source controller of claim 1, wherein the first voltage level is 0 volts. An illumination system for selecting a light source illumination mode by using a power switch, comprising: a power switch; and a plurality of illumination devices electrically connected to the power switch, each illumination device comprising: at least one light source; a clock signal generator for A voltage signal is generated when an AC power source voltage level reaches a first voltage level; a power converter is configured to convert the AC power source into a DC power source; and a power voltage sensor is configured to sense the DC power source a voltage level; and a microcontroller electrically connected to the clock signal generator and the power voltage sensor, the microcontroller is configured to generate one of the last clock signals before the power switch is turned off The illumination mode of the at least one light source is selected at a second time when the voltage level of the DC power source reaches a second voltage level after the power switch is turned on. The illumination system of claim 6, wherein the microcontroller is configured to select an illumination mode of the at least one light source when a difference between the first time and the second time is less than a predetermined value. The lighting system of claim 1, wherein the lighting device further comprises a capacitor electrically coupled to the microcontroller. The illumination system of claim 1, wherein the at least one light source comprises a plurality of colors of light emitting diodes. The lighting system of claim 1, wherein the first voltage level is 0 volts.