TWI448190B - Illuminating apparatus with power detection and method thereof - Google Patents

Description

Lighting device with power detection and method thereof

A lighting device and method, in particular, a lighting device and method for detecting power through a light emitting diode.

Since the light-emitting diode has the characteristics of low power consumption, high brightness and long life, the light-emitting diode has been widely used in various lighting devices. Please refer to FIG. 1 , which is a schematic diagram of a lighting device. The illuminating device comprises a rectifying circuit 90, a illuminating group 92 and a current source 94, and the illuminating group 92 is composed of a plurality of illuminating diodes connected in series. The rectifying circuit 90 is described herein as a full-wave rectifying circuit. Therefore, the alternating current power source can obtain a pulsating direct current through the rectifying circuit 90, and the pulsating direct current is used as an input power source for supplying the light emitting diode. When a plurality of series connected light emitting diodes are turned on, the current source 94 can provide a stable current to each of the light emitting diodes in the light emitting group 92.

In order to increase the brightness of the illumination device, it is common practice to connect a plurality of light-emitting diodes in series as in the illumination group 92, but the on-voltage of the illumination group 92 is also relatively increased. Therefore, during one week of the pulsating DC, the on-time of the illuminating group 92 is only within a time range in which the pulsating DC power source is higher than the turn-on voltage of the illuminating group 92. More specifically, the low on-time of the illumination group 92 will make the stroboscopic phenomenon of the illumination device more apparent.

The present invention provides a lighting device and method with power detection to solve the above problems.

An embodiment of the invention provides a lighting device with power detection The device includes a light emitting unit, a detecting unit and a control unit. The light emitting unit has a plurality of light emitting groups and switching units, and the switching unit is configured to connect the light emitting groups in series and/or in parallel. The detecting unit is configured to detect an input power input to the light emitting unit. And the control unit is coupled to the detecting unit and the switch unit, and the control unit controls the switch unit according to the detection result of the detecting unit and the setting parameter of the corresponding input power source, so that the turn-on voltage in the light emitting unit changes with the input power source.

Another embodiment of the present invention provides a lighting device with power detection, including a lighting unit, a detecting unit, and a control unit. The light emitting unit further includes a first light emitting diode module, a second light emitting diode module and a third switching circuit. The first LED module has a first lighting group, a second lighting group and a first switching circuit. The first switching circuit is configured to control the first lighting group and the second lighting group to be connected in series and/or in parallel. The second LED module has a third illumination group, a fourth illumination group, and a third switch circuit. The second switch circuit is configured to control the third illumination group and the fourth illumination group to be connected in series and/or in parallel. The second switch circuit is configured to control the first light emitting diode module and the second light emitting diode module to be connected in series and/or in parallel. The detecting unit is configured to detect an input power input to the light emitting unit. The control unit is coupled to the detecting unit, the first switching circuit, the second switching circuit and the third switching circuit, and the control unit controls the first switching circuit according to the detection result of the detecting unit and the setting parameter of the corresponding input power source. The two switch circuits and the third switch circuit are configured to change a turn-on voltage of the first light-emitting group, the second light-emitting group, the third light-emitting group, and the fourth light-emitting group in the light-emitting unit according to the input power source.

A further embodiment of the present invention provides a lighting method for a lighting device. The lighting device includes a control unit, a detecting unit, and a lighting unit. The lighting unit has a plurality of lighting groups and a switching unit, and the switching unit is configured to enable the lighting. Groups are connected in series and / or in parallel. The lighting method includes: the control unit determines a setting parameter corresponding to an input power source, the input power source is used for inputting to the lighting unit for use; and the control unit detects the detection result of the input power source according to the detecting unit and controls the switching unit according to the setting parameter. So that the turn-on voltage of the light-emitting groups in the light-emitting unit varies with the input power source.

Therefore, the present invention has the following effects through the above embodiments: for a lighting device with power detection, the turn-on voltage can be relatively adjusted according to the input power of different voltage ranges, so that the light-emitting unit is at the input power source. The on-time is extended during the cycle time to reduce the strobe when the illumination unit is illuminated.

The above summary and the following examples are intended to be illustrative of the invention and the embodiments of the invention.

The invention relates to a lighting device with power detection and a method thereof, wherein the lighting device is an illumination array composed of a plurality of light emitting diodes, and the voltage specification of the input power source used for detecting the lighting array is And a set parameter is used as a control basis for changing the string/parallel relationship between the plurality of light emitting diodes. Thereby, the turn-on voltage of the illumination array can be relatively adjusted according to the change of the input voltage, and the illumination device can be used for the input power source of different voltage specifications.

The adjusting voltage of the lighting device can be adjusted, for example, by connecting a plurality of light emitting diodes of the lighting device in parallel to reduce the turn-on voltage of the lighting array or connecting in series to increase the turn-on voltage of the lighting array, or Partially lit diodes are connected in parallel and a part of the light emitting diodes are connected in series The effect of adjusting the turn-on voltage of the lighting device can be achieved, thereby extending the luminous efficiency of the lighting device and reducing the flick effect.

Please refer to FIG. 2 , which is a block diagram of a lighting device with power detection according to an embodiment of the invention. The lighting device 1 can include a detecting unit 11, a lighting unit 13, and a control unit 15. The control unit 15 is coupled between the detecting unit 11 and the lighting unit 13 .

The detecting unit 11 is configured to detect the state of the input power source Vin used by the light emitting unit 13. For example, the detecting unit 11 can know the voltage range specification of the input power source Vin (such as the peak value of the input voltage) and the phase change state. More specifically, the detecting unit 11 may include a phase detecting circuit and/or a voltage detecting circuit, and the phase detecting circuit detects the phase of the input power source Vin and detects the input through the voltage detecting circuit. The voltage of the power source Vin, but the invention is not limited thereto. It should be noted that the input power supply refers to the pulsating DC in the following description. For example, the AC power supply can be rectified to obtain the pulsating DC. Furthermore, the pulsating direct current can be a full-wave or a half-wave pulsating direct current. The following description will be explained by full-wave pulsating DC.

The light emitting unit 13 may include a plurality of light emitting groups 131 and a switching unit 133. The light-emitting group 131 refers to a light string composed of a plurality of light-emitting diodes connected in series, and the light-emitting group 131 can receive the input power source Vin to present a forward conduction. The switch unit 133 can then be used to change the circuit connection relationship between the plurality of light groups 131. The switching unit 133 may include a plurality of switching elements and/or associated circuit elements (such as unidirectional conduction elements).

In an embodiment, the switching unit 133 can establish various serial/parallel circuit connection relationships between the plurality of lighting groups 131. For example, one light group 131 can be combined with another one or more by the control of the switch unit 133. The light-emitting groups 131 are formed in series and/or in parallel, or the plurality of light-emitting groups 131 are divided into a plurality of groups, and each group includes a plurality of light-emitting groups 131 connected in series and/or in parallel with each other, and a plurality of groups The groups can also be connected in series and/or in parallel with each other. It should be noted that the circuit connection between the above-mentioned respective light-emitting groups 131 is only an example, and the present invention is not limited thereto.

The control unit 15 is used as the basis for controlling the switch unit 133 according to the detection result of the detecting unit 11, so that the circuit connection between the light-emitting groups 131 in the light-emitting unit 13 can be adjusted according to the voltage range of the input power supply voltage, and The conduction of the light-emitting unit 13 is made bright. For example, after the control unit 15 knows the voltage peak value of the input power source Vin through the detecting unit 11, the corresponding setting parameter is determined according to the current voltage peak size, and then the parameter content and the cooperation detecting unit 11 are set according to the current setting. The voltage change of the input power source is detected, and the switching unit 133 is controlled so that the turn-on voltage of the light-emitting unit 13 can be relatively adjusted as the voltage of the input power source changes.

For example, if the voltage level of the input power source Vin is higher than the turn-on voltage drop of the group of the light-emitting groups 131 or the series-connected voltage drop of the plurality of groups of the light-emitting groups 133, the control unit 15 can obtain the result through the detecting unit 11. And through the control of the switching unit 133, the light-emitting group 131 can be turned on or off in parallel or in series to illuminate. In an embodiment, the control unit 15 may set one or more sets of preset values as the determination condition of the adjustment switch unit 133, and the preset value may be a preset voltage value or a preset time value, but This is limited.

In an embodiment, the lighting device 1 with power detection further includes a current source 17. The current source 17 is coupled to the light emitting unit 13 and provides a stable current source when the light emitting group 131 in the light emitting unit 13 is turned on. In another reality In an example, the current source 17 can also provide an adjustable current source according to the control of the control unit 15 to provide different on-current sources according to different conduction voltage drops in series and/or parallel connection between the illumination groups 131. . For example, when the conduction voltage drop of the light-emitting unit 13 is low, it may represent that the number of parallel connections between the light-emitting groups 131 is large, so that the current source 17 requires a relatively large on-current; and vice versa when the conduction voltage drop of the light-emitting unit 13 is high. , it may represent that there are a large number of series connection between the light-emitting groups 131, so the power flow 17 can provide relatively small on-current.

Please refer to FIG. 3 , which is a flowchart of a lighting method according to an embodiment of the present invention. In the description of the flow of FIG. 3, please also refer to the lighting device with power detection shown in FIG. 2. The process of FIG. 3 includes the following steps: the control unit 15 detects the input power through the detecting unit 11 (step S301). Know the relevant state of the input power supply, such as the range of the input power supply voltage and the phase state. According to the detection result of the detecting unit 11, the control unit 15 can know the peak value of the input power supply voltage, and further determine whether there is a setting parameter corresponding to the current input power supply voltage to determine the control conduction mode of the switching unit 133 (eg, Step S303). When there is a condition that meets the set parameter, the control unit 15 controls the switch unit 133 according to the setting content of the setting parameter and the detecting unit 11 detecting the detection result of the input power to control between the light-emitting groups 131. The connection relationship (step S305) is such that the turn-on voltage of the light-emitting unit 13 can be relatively adjusted as the voltage of the input power source changes. Then repeat the above steps in this way. The above setting parameter is a correspondence relationship between the input power source voltage and the switching unit 133.

Please refer to FIG. 4 , which is a block diagram of a lighting device in combination with a power supply according to an embodiment of the present invention. The lighting device 2 can include a rectifying unit 10 and detecting The unit 11, the voltage stabilizing unit 12, the light emitting unit 14, the control unit 15, and the current source 17. The rectifying unit 10 is coupled to the detecting unit 11, the voltage stabilizing unit 12, and the light emitting unit 14, respectively. The control unit 15 is coupled to the detecting unit 11, the voltage stabilizing unit 12, and the light emitting unit 14, respectively.

In one embodiment, the rectifying unit 10 can be a full-wave rectifying circuit to rectify the waveform of the alternating current power source into an input power source that can be used by the lighting unit 14, which is a full-wave pulsed direct current. It should be noted that the rectifying unit 10 is not limited thereto, and may also be a half-wave rectifying circuit.

The detecting unit 11 is configured to detect the state of the input power source. In an embodiment, the detecting unit 11 may include a phase detecting circuit and/or a voltage detecting circuit.

The voltage stabilizing unit 12 is configured to pass the input power through the power supply voltage regulation to output a fixed voltage DC power supply for use by the control unit 15.

The illuminating unit 14 includes a plurality of illuminating diode modules, which are illustrated by the first illuminating diode module 141 and the second illuminating diode module 143, and the first illuminating diode module 141 and The second LED modules 143 can be serially/parallel to each other through the control of the second switching circuit 142. Each of the light emitting diode modules individually includes a plurality of light emitting groups and switching circuits. For example, in the case of the first light-emitting diode module 141, the plurality of light-emitting groups refers to two sets of the first light-emitting group 1411 and the second light-emitting group 1413. The first light-emitting group 1411 and the second light-emitting group 1413 respectively include a plurality of light-emitting diodes connected in series and in the same quantity, and each of the light-emitting groups is capable of receiving input power and the voltage of the input power source exceeds the conduction voltage drop of the light-emitting group. Sometimes the light is shining.

The switching circuit of the first LED module 141 refers to the first switching circuit 1412, and the first switching circuit 1412 further includes a first switching element S11, The second switching element S12 and the first one-way conducting element D1. The first switching element S11 is coupled to one end of the first lighting group 1411, the second switching element S12 is coupled to one end of the second lighting group 1413, and the first one-way conducting element D1 is coupled to the first lighting group 1411 and the second Between the illumination groups 1413. The first switching element S11 and the second switching element S12 may be mechanical switches or electronic switches. If the first switching element S11 and the second switching element S12 are electronic switches, they can be composed of Darlington circuits. The first one-way conducting element D1 may be a diode. However, the above description of the elements is not intended to limit the invention.

The mode of operation of the first switching circuit 1412 is explained below. When the first switching element S11 and the second switching element S12 are both non-conductive, the first lighting group 1411, the first one-way conducting element D1 and the second lighting group 1412 are sequentially connected in series and can be turned on. When the first switching element S11 and the second switching element S12 are both turned on, the first lighting group 1411 is connected in parallel with the second lighting group 1413, and the first one-way conducting element D1 is not turned on. It should be noted that the above-mentioned first switch circuit 1412 architecture is merely an example of a switch unit used in the light-emitting unit 14, and is not intended to limit the present invention.

The second light-emitting diode module 143 includes a third light-emitting group 1431, a fourth light-emitting group 1433, and a third switch circuit 1432. The third switch circuit 1432 further includes a third switch element S31 and a fourth switch element S32. Three-way guide element D3. Since the second LED module 143 is configured in the same manner as the first LED module 141, the operation of the second LED module 143 will not be described herein.

The second switch circuit 142 includes a fifth switching element S21, a sixth switching element S22, and a second unidirectional element D2. The fifth switching element S21 is coupled between the second end of the first LED module 141 and the second end of the second LED module 143, and the sixth switching element S22 is coupled to the first LED. pole The first end of the body module 141 and the first end of the second LED module 143 are coupled to the second end of the first LED module 141. The first end of the two light emitting diode module 143. When the fifth switching element S21 and the sixth switching element S22 are both non-conductive, the first LED module 141, the second unidirectional diode component D2 and the second LED module 143 are serially connected in series. It is also available for conduction. When the fifth switching element S21 and the sixth switching element S22 are both turned on, the first LED module 141 is connected in parallel with the second LED module 143, and the second unidirectional component D2 is not turned on. .

More specifically, the LED modules 141, 143 can be controlled by the respective switching circuits 1412 and 1432 such that the first lighting group 1411 and the second lighting group 1413 are connected in series or in parallel, and the third lighting group 1431 is caused. The fourth light-emitting group 1433 is connected in series or in parallel, and the light-emitting diode modules 141 and 143 can be serially/parallel to each other through the control of the second switching circuit 142. That is to say, the conduction voltage drop of the light-emitting unit 14 can be adjusted between the minimum conduction voltage drop and the highest conduction voltage drop by the control of the switching unit formed by the respective switching circuits, and the minimum conduction voltage drop refers to all the light-emitting groups. The voltage drop is the parallel conduction, and the highest conduction voltage drop is the voltage drop in which all the illumination groups are connected in series.

The control unit 15 controls the switching units configured by the first switching circuit 1412, the second switching circuit 142, and the third switching circuit 1432 according to the result of the detecting unit 11. The control mode of the switching unit may be, for example, controlling the conduction or non-conduction of the switching elements in each switching circuit. In an embodiment, the control unit 15 can set more than one set of preset turn-on voltage values between the lowest turn-on voltage drop and the highest turn-on voltage drop of the light-emitting unit 14, and each preset turn-on voltage value corresponds to one type of switch. Circuit control .

Therefore, when the control unit 15 is actually operating, the state of the input power source can be known according to the detection result of the detecting unit 11, and it is determined whether there is a corresponding matching parameter. If there is a match, the content defined by the setting parameter is determined. Determining whether the input input power voltage currently meets the preset turn-on voltage value, and if so, adjusting the turn-on voltage drop in the light-emitting unit 14 by the control mode of the switch circuit 1412 corresponding to the preset turn-on voltage value, so that the light-emitting unit 14 is enabled. It can be turned on and lit at the current input power supply voltage.

On the other hand, when the control unit 15 adjusts the ON voltage drop of the light-emitting unit 14 for each switching circuit, the current level of the current source 17 supplied to the light-emitting unit 14 can be further adjusted.

5A and FIG. 5B are flowcharts of a lighting method according to an embodiment of the present invention. Referring to FIG. 4 for explaining the flow of FIG. 5, for convenience of description, the following one group of load voltages refers to the first light-emitting group 1411, the second light-emitting group 1413, the third light-emitting group 1431, and the first The turn-on voltage of any one of the four light-emitting groups 1433, and the two sets of load voltages refer to the turn-on voltages of the two groups of the first light-emitting group 1411, the second light-emitting group 1413, the third light-emitting group 1431, and the fourth light-emitting group 1433 in FIG. And so on, and the turn-on voltages of the respective light-emitting groups are assumed to be the same. The process of Figure 5 includes the following steps:

Step S501: The control unit 15 controls the voltage detecting circuit of the detecting unit 11 to detect the voltage range of the input power source.

Step S502: Determine whether to use the first setting parameter according to the detection result of step S501. If the determination in S502 is YES, the control of the subsequent lighting unit 14 is set to be processed by the first setting parameter (step S503); if the determination in S502 is no, the control of the subsequent lighting unit 14 is set to be processed by the second setting parameter ( In step S504).

The first setting parameter described herein is used when the AC power source is in the range of 220 to 240 V. Therefore, when the detecting unit 11 detects that the relative peak value of the input power source voltage is 220 to 240 V, the control unit 15 is based on this. As a result, step 503 is performed. The second setting parameter is used when the AC power source is in the range of AC100~120V. Therefore, when the detecting unit 11 detects that the relative peak value of the input power source voltage is 100~120V, the control unit 15 performs the steps according to the result. 504. In addition, it should be noted that the number of setting parameters can be relatively set according to various voltage ranges of the input power supply voltage, and is not limited to the two groups exemplified herein.

Step S503: The control unit 15 sets a voltage range (for example, a voltage front value of 220 to 240 V) of the current input power source as a first corresponding parameter for use as a control basis for the subsequent light emitting unit 14.

Step S504: The control unit 15 sets a voltage range (for example, a voltage front value of 100 to 120V) for the current input power source as a second corresponding parameter for use as a control basis for the subsequent lighting unit 14.

Step S505: The control unit 15 controls the phase detecting circuit of the detecting unit 11 to detect the phase of the input power source, thereby determining whether the phase of the input power source is at the triggering starting point. When the determination in step S505 is YES, step S506 is performed; when the determination in step S505 is NO, step S507 is performed. In one embodiment this triggering activation point refers to the zero phase of the input power source.

Step S506: reset the phase, time and count of the input power source for use as a control basis for the subsequent lighting unit 14.

Step S507: The control unit controls the phase detecting circuit of the detecting unit 11 to detect the phase of the input power source, thereby determining whether the phase of the input power source is less than 90 degrees. If the determination in S507 is YES, step S508 is performed; if the determination in S507 is NO, step S532 is performed.

Step S508: determining whether the first setting parameter is used. If the determination in S508 is YES, step S509 is performed; if the determination in S508 is NO, step S520 is performed.

Step S509: The control unit 15 detects, by the voltage detecting circuit of the detecting unit 11, whether the input power voltage is greater than 4 times the load voltage. If the determination in S509 is YES, step S510 is performed; if the determination in S509 is NO, step S511 is performed.

Step S510: The control unit 15 transmits the control of the switching circuit to cause the light-emitting unit 14 to emit light with a load voltage of 4 times. For example, the control unit 15 controls the first switching element S11 and the second switching element S12, the fifth switching element S21 and the sixth switching element S22, and the third switching element S31 and the fourth switching element S32 to be non-conductive, so that the light-emitting unit 14 is turned on. The first first light-emitting group 1411, the second light-emitting group 1413, the third light-emitting group 1431, and the fourth light-emitting group 1433 are electrically connected in series with each other.

Step S511: The control unit 15 detects, by the voltage detecting circuit of the detecting unit 11, whether the input power voltage is greater than three times the load voltage. If the determination in S511 is yes, step S512 is performed. If the determination in step S511 is negative, step S513 is performed. .

Step S512: The control unit 15 transmits the control of the switching circuit to cause the light emitting unit to emit light with a load voltage of 3 times. For example, the control unit 15 controls the first switching element S11 and the second switching element S12, the fifth switching element S21, and the sixth switching element S22 to be non-conductive, and the third switching element S31 and the fourth switching element S32 are both turned on, so that The first light-emitting group 1411 and the second light-emitting group 1413 of the light-emitting unit 14 are connected in series, and the third light-emitting group 1431 and the fourth light-emitting group 1433 are connected in parallel, and the light-emitting diode module 141 and the light-emitting diode module are connected. Group 143 is connected in series.

Step S513: The control unit 15 detects, by the voltage detecting circuit of the detecting unit 11, whether the input power voltage is greater than twice the load voltage. If the determination in S513 is YES, step S514 is performed; if the determination in S513 is NO, the process returns to step S505.

Step S514: The control unit 15 transmits the control of the switching circuit to cause the light-emitting unit 14 to emit light at a load voltage of two. For example, the control unit 15 controls the first switching element S11 and the second switching element S12, the third switching element S31, and the fourth switching element S32 to be both turned on, and the fifth switching element S21 and the sixth switching element S22 are both non-conductive, so that The first light-emitting group 1411 and the second light-emitting group 1413 of the light-emitting unit 14 are connected in parallel, and the third light-emitting group 1431 and the fourth light-emitting group 1433 are connected in parallel, and the light-emitting diode module 141 and the light-emitting diode module are connected. 143 series.

Step S520: The control unit 15 detects, by the voltage detecting circuit of the detecting unit 11, whether the input power voltage is greater than twice the load voltage. If the determination in S520 is YES, step S521 is performed; if the determination in S520 is NO, the process returns to step S505.

Step S521: The control unit 15 transmits the control of the switching circuit to cause the light-emitting unit 14 to emit light at a double load voltage. For example, the control unit 15 controls the first switching element S11 and the second switching element S12, the third switching element S31, and the fourth switching element S32 to be both turned on, and the fifth switching element S21 and the sixth switching element S22 are both non-conductive, so that The first light-emitting group 1411 and the second light-emitting group 1413 of the light-emitting unit 14 are connected in parallel, and the third light-emitting group 1431 and the fourth light-emitting group 1433 are connected in parallel, and the light-emitting diode module 141 and the light-emitting diode module are connected. 143 series.

Step S532: It is judged whether the first setting parameter is used. If the determination in S532 is YES, step S533 is performed; if the determination in S532 is no, the step is executed. S540.

Step S533: The control unit 15 detects, by the voltage detecting circuit of the detecting unit 11, whether the input power voltage is less than twice the load voltage. If the determination in S533 is YES, step S534 is performed; if the determination in S533 is NO, step S535 is performed.

Step S534: The control unit 15 transmits the control of the switching circuit to cause the light emitting unit to emit light at a load voltage of 1 time. For example, the control unit 15 controls the first switching element S11 and the second switching element S12, the fifth switching element S21 and the sixth switching element S22, and the third switching element S31 and the fourth switching element S32 to be both turned on, so that the light emitting unit 14 is The first light-emitting group 1411, the second light-emitting group 1413, the third light-emitting group 1431, and the fourth light-emitting group 1433 are electrically connected in parallel with each other.

Step S535: The control unit 15 detects, by the voltage detecting circuit of the detecting unit 11, whether the input power voltage is less than 3 times the load voltage. If the determination in S535 is YES, step S536 is performed; if the determination in S535 is NO, step S537 is performed.

Step S536: The control unit 15 transmits the control of the switching circuit to cause the light-emitting unit 14 to emit light at a double load voltage. For example, the control unit 15 controls the first switching element S11 and the second switching element S12, the third switching element S31, and the fourth switching element S32 to be both turned on, and the fifth switching element S21 and the sixth switching element S22 are both non-conductive, so that The first light-emitting group 1411 and the second light-emitting group 1413 of the light-emitting unit 14 are connected in parallel, and the third light-emitting group 1431 and the fourth light-emitting group 1433 are connected in parallel, and the light-emitting diode module 141 and the light-emitting diode module are connected. 143 series.

Step S537: The control unit 15 detects, by the voltage detecting circuit of the detecting unit 11, whether the input power voltage is less than 4 times the load voltage. Such as If the determination in S537 is YES, then step S538 is performed; if the determination in S537 is NO, the process returns to step S505.

Step S538: The control unit 15 transmits the control of the switching circuit to cause the light-emitting unit 14 to emit light with a load voltage of 4 times. For example, the control unit 15 controls the first switching element S11 and the second switching element S12, the fifth switching element S21 and the sixth switching element S22, and the third switching element S31 and the fourth switching element S32 to be non-conductive, so that the light-emitting unit 14 is turned on. The first first light-emitting group 1411, the second light-emitting group 1413, the third light-emitting group 1431, and the fourth light-emitting group 1433 are electrically connected in series with each other.

Step S540: The control unit 15 detects, by the voltage detecting circuit of the detecting unit 11, whether the input power voltage is less than twice the load voltage. If the determination in S540 is YES, step S541 is performed; if the determination in S540 is NO, the process returns to step S505.

Step S541: The control unit 15 transmits the control of the switching circuit to cause the light-emitting unit 14 to emit light with a load voltage of one time. For example, the control unit 15 controls the first switching element S11 and the second switching element S12, the fifth switching element S21 and the sixth switching element S22, and the third switching element S31 and the fourth switching element S32 to be both turned on, so that the light emitting unit 14 is The first light-emitting group 1411, the second light-emitting group 1413, the third light-emitting group 1431, and the fourth light-emitting group 1433 are electrically connected in parallel with each other.

The specific content of the first setting parameter is used when the control unit 15 performs steps S509 to S514 and steps S533 to S538, and the specific content of the second setting parameter is for the control unit 15 to perform steps S520 to S521 and steps S540 to S541. When used.

Specifically, the first setting parameter and the second setting parameter are used to define that the input power voltage meets a preset voltage value (for example, N as exemplified above). When the load voltage is doubled, the corresponding relationship between the switch components of the switch circuits corresponding to the preset voltage values is turned on, so that the control unit 15 can further control the switch components of the switch circuits according to the corresponding relationship, thereby The turn-on voltage of the light-emitting unit 14 can vary with the input power supply voltage.

It should be noted that, in FIG. 5, the voltage detecting circuit of the detecting unit 11 detects whether the input power voltage meets the corresponding preset voltage value. However, since the change of the input power source is regular, the relationship between the input power source and the specific input power source voltage in a certain period of time is known by the look-up table, so the control unit 15 can also pass through another type. The timing mode determines the preset time value required for the input power supply voltage to start timing at zero phase to meet the preset voltage value. When the control unit 15 is timed to meet the preset time, each of the switch units corresponding to the preset time value may be The corresponding relationship of the switching elements of the switching circuit is turned on, so that the control unit 15 can further control the switching elements of the switching circuits according to the corresponding relationship.

In addition, the architecture disclosed in FIG. 4 may also be changed according to the actual design requirements of the circuit. For example, the number of the LED modules may be one or more groups, and the connection between the LED modules or the illumination may be The connection manner between the respective light-emitting groups in the diode module is not limited to the above description of the switch circuit.

(possible efficacy of the embodiment)

In summary, the illumination device of the present invention can relatively dynamically adjust the on-voltage in the light-emitting unit according to the input power source using different transmission voltage ranges, so that the illumination efficiency of the illumination unit can be more effectively improved, and the illumination can be effectively reduced at the same time. The stroboscopic phenomenon of the unit.

The above is only an embodiment of the present invention, which is not intended to limit the present invention. Patent scope.

1, 2‧‧‧Lighting devices with power detection

10‧‧‧Rectifier unit

11‧‧‧Detection unit

12‧‧‧Stabilizer

13, 14‧‧‧Lighting unit

131‧‧‧Lighting group

133‧‧‧Switch unit

141‧‧‧First LED Module

1411‧‧‧First lighting group

1412‧‧‧First switch circuit

1413‧‧‧Second illumination group

143‧‧‧Second light-emitting diode module

1431‧‧‧3rd lighting group

1432‧‧‧third switch circuit

1433‧‧‧fourth illumination group

142‧‧‧Second switch circuit

15‧‧‧Control unit

17‧‧‧current source

90‧‧‧Rectifier circuit

92‧‧‧Lighting group

94‧‧‧current source

S301~S305‧‧‧ Flowchart Step Description

S501~S541‧‧‧ Flowchart Step Description

1 is a schematic diagram of a lighting device; FIG. 2 is a block diagram of a lighting device with power detection according to an embodiment of the present invention; FIG. 3 is a flow chart of a lighting method according to an embodiment of the present invention; A block diagram of a device in conjunction with a power supply; and FIG. 5 is a flow chart of a lighting method in accordance with an embodiment of the present invention.

1‧‧‧Lighting device with power detection

11‧‧‧Detection unit

13‧‧‧Lighting unit

131‧‧‧Lighting group

133‧‧‧Switch unit

15‧‧‧Control unit

17‧‧‧current source

Claims (17)

A lighting device with power detection includes: a light emitting unit having a plurality of light emitting groups and a switch unit, wherein the switch unit is configured to connect the light emitting groups in series and/or in parallel; and a detecting unit is configured to detect An input power input to the light emitting unit; and a control unit coupled to the detecting unit and the switch unit, the control unit is controlled according to the detection result of the detecting unit and a setting parameter corresponding to the input power source The switching unit is configured to change a turn-on voltage of the light-emitting unit according to the input power source; wherein the control unit detects a voltage specification of the input power source according to the detecting unit to select the setting parameter corresponding to the input power source; When the voltage specification of the input power source is a first voltage specification, the selected setting parameter is a first setting parameter, and when the voltage specification of the input power source is a second voltage specification, the selected setting parameter is a first Setting a parameter, and a peak voltage of the first voltage specification is greater than a peak voltage of the second voltage specification, and the first setting parameter is controlled The maximum number of series of the light-emitting groups is N, and the second setting parameter controls the maximum number of series connection of the light-emitting groups to be M, where N is greater than M. The lighting device with power detection as described in claim 1, wherein each of the light-emitting groups comprises a plurality of light-emitting diodes connected in series. The illuminating device with power detection as described in claim 2, wherein the detecting unit includes a phase detecting circuit, and the control unit knows the phase of the input power source through the phase detecting circuit, and according to The phase change of the input power source controls whether the switch unit is turned on according to the setting parameter. A lighting device with power detection as described in claim 2, wherein The setting parameter is a correspondence relationship between the input power supply voltage and whether the switching unit is turned on. The lighting device with power detection as described in claim 2, further comprising: a current source coupled to the light emitting unit for providing a stable current when the light emitting unit is turned on; and The rectifying unit is configured to rectify an AC power source into the input power source. The lighting device with power detection according to claim 5, wherein the control unit controls the current of the current source to change from small to large according to the on-voltage of the light-emitting unit. A lighting device with power detection includes: a light emitting unit comprising: a first light emitting diode module having a first lighting group, a second lighting group and a first switching circuit, the first switch The second light emitting diode module has a third light emitting group, a fourth light emitting group and a third switching circuit. The third switch circuit is configured to control the third light-emitting group and the fourth light-emitting group to be connected in series and/or in parallel; and a second switch circuit is configured to control the first light-emitting diode module and the two light-emitting diodes The module is connected in series and/or in parallel; a detecting unit is configured to detect an input power input to the light emitting unit; and a control unit is coupled to the detecting unit and the first switch circuit and the second switch And the third switch circuit, the control unit controls the first switch circuit, the second switch circuit and the third switch according to the detection result of the detecting unit and a setting parameter corresponding to the input power source a path for causing a turn-on voltage of the first light-emitting group, the second light-emitting group, the third light-emitting group, and the fourth light-emitting group to vary with the input power source; wherein the control unit is based on the detecting The unit detects the voltage specification of the input power source to select the setting parameter corresponding to the input power source; wherein when the voltage specification of the input power source is a first voltage specification, the selected setting parameter is a first setting parameter, and When the voltage specification of the input power source is a second voltage specification, the selected setting parameter is a second setting parameter, and a peak voltage of the first voltage specification is greater than a peak voltage of the second voltage specification, and the first The setting parameter controls the maximum conduction voltage drop of the light emitting unit to be greater than the second setting parameter to control the maximum conduction voltage drop of the light emitting unit. The illumination device with power detection according to claim 7, wherein the first illumination group, the second illumination group, the third illumination group, and the fourth illumination group respectively comprise a plurality of series illuminations Diode. The illuminating device with power detection as described in claim 8, wherein the detecting unit includes a phase detecting circuit, and the control unit knows the phase of the input power source through the phase detecting circuit, and according to The phase change of the input power source controls whether the switch circuit, the second switch circuit and the third switch circuit are turned on according to the setting parameter. The illuminating device with power detection according to claim 8 , wherein the first switching circuit comprises: a first switching component coupled to the first lighting group; and a second switching component coupled The second illuminating group; and a first unidirectional conduction element coupled between the first switching element and the second switching element; When the first switching element is electrically connected to the second switching element, the first lighting group is connected in parallel with the second lighting group; wherein when the first switching element and the second switching element are not conducting, the first illumination The group is in series with the second lighting group, and the first one-way conducting element is conductive. The illuminating device with power detection according to claim 10, wherein the third switching circuit comprises: a third switching component coupled to the third lighting group; and a fourth switching component coupled And the third illuminating group is coupled between the third switching element and the fourth switching element; wherein when the third switching element is electrically connected to the fourth switching element, The third lighting group is connected in parallel with the fourth lighting group; wherein when the third switching element and the fourth switching element are not conducting, the third lighting group is connected in series with the fourth lighting group, and the third one-way conducting component To be conductive. The illuminating device with power detection according to claim 11, wherein the second switching circuit comprises: a fifth switching element coupled to the first LED module; a sixth switch An element coupled to the second LED module; and a second one-way element coupled between the fifth switching element and the sixth switching element; wherein the fifth switching element and the When the sixth switching element is turned on, the first LED module is connected in parallel with the second LED module; wherein when the fifth switching element and the sixth switching element are not conducting, the first LED The pole body module is connected in series with the second light emitting diode module, and the The second one-way conduction element is conductive. The lighting device with power detection as described in claim 8 further includes: a current source coupled to the light emitting unit for providing a stable current when the light emitting unit is turned on; and a rectifying And a unit for rectifying an AC power source into the input power source. The lighting device with power detection according to claim 13 , wherein the control unit controls the current of the current source to change from small to large according to the on-voltage of the light-emitting unit. A lighting device includes a control unit, a detecting unit and a lighting unit. The lighting unit has a plurality of lighting groups and a switching unit. The switching unit is configured to connect the lighting groups in series and/or Or parallel connection, the method includes: the control unit determines a setting parameter corresponding to an input power source, the input power source is used for inputting to the lighting unit for use; and the control unit detects the detection of the input power source according to the detecting unit As a result, the switch unit is controlled to match the setting parameter, so that the turn-on voltage of the light-emitting groups in the light-emitting unit varies with the input power source; wherein the control unit detects the voltage specification of the input power source according to the detecting unit to select Corresponding to the input parameter used by the power source; wherein when the voltage specification of the input power source is a first voltage specification, the selected setting parameter is a first setting parameter, and when the voltage specification of the input power source is a second In the voltage specification, the selected setting parameter is a second setting parameter, and the peak voltage of the first voltage specification is greater than The peak voltage of the second voltage specification, and the first setting parameter controls the maximum number of series connection of the lighting groups to be N, and the second setting parameter controls the The maximum number of series of illumination groups is M, where N is greater than M. The lighting method of claim 15, wherein the setting parameter is a correspondence between the input power supply voltage and whether the switching unit is conductive. The lighting method of claim 15, further comprising: the control unit adjusting a size of the current source according to the detection result of the input power source, the current source is supplied to the light emitting unit when the light is turned on and illuminated The current is adjusted, and the current of the current source is adjusted to vary from large to small when the on-voltage of the light-emitting unit changes from small to large.