Dimming module, dimming method and lighting device
A dimming module includes a triggering circuit, a control signal generating circuit, a voltage converting circuit, and a linear driving circuit. The triggering circuit is configured to control a trigger delay angle of an AC input voltage according to a dimming command, in order to output a first voltage signal correspondingly. The control signal generating circuit is configured to output a control voltage according to the first voltage signal. The voltage converting circuit is configured to output a DC operating voltage having an operating level according to the first voltage signal, and output the DC operating voltage to a lighting module, in which the lighting module includes a light-emitting diode. The linear driving circuit is configured to drive the lighting module according to the control voltage.
1. A dimming module, comprising:
a triggering circuit configured to control a trigger delay angle of an ac input voltage according to a dimming command, so as to output a first voltage signal correspondingly;
a control signal generating circuit configured to output a control voltage according to the first voltage signal;
a voltage converting circuit configured to output a dc operating voltage having an operating level according to the first voltage signal, and output the dc operating voltage to a lighting module, wherein the lighting module comprises a light-emitting diode;
a linear driving circuit, configured to drive the lighting module according to the control voltage; and
a rectifying circuit configured to rectify the first voltage signal, so as to output a second voltage signal;
wherein the control signal generating circuit is configured to receive the second voltage signal and output the control voltage according to the second voltage signal, and the control signal generating circuit comprises:
a first resistor, wherein a first terminal of the first resistor is configured to receive the second voltage signal;
a second resistor, wherein a first terminal of the second resistor is electrically coupled to a second terminal of the first resistor and a second terminal of the second resistor is electrically coupled to a around terminal; and
a first capacitor, wherein a first terminal of the first capacitor is electrically coupled to the first terminal of the second resistor, and a second terminal of the first capacitor is electrically coupled to the second terminal of the second resistor.
2. The dimming module of claim 1 , wherein the voltage converting circuit is configured to convert the second voltage signal to the dc operating voltage, and output the dc operating voltage to the lighting module.
3. The dimming module of claim 1 , wherein when the triggering circuit changes the trigger delay angle according to the dimming command, the dc operating voltage is maintained at the same operating level.
4. The dimming module of claim 1 , wherein the linear driving circuit comprises:
a processing unit configured to output a driving signal according to the control voltage; and
a driving unit configured to drive the lighting module according to the driving signal.
5. The dimming module of claim 4 , wherein the processing unit is configured to control the driving unit via the driving signal, so as to adjust a driving current flowing through the lighting module.
6. The dimming module of claim 5 , wherein the driving unit comprises a driving switch, and a first terminal of the driving switch is electrically coupled to the lighting module, a second terminal of the driving switch is electrically coupled to a ground terminal, and a control terminal of the driving switch is configured to receive the driving signal, wherein the processing unit is configured to control the driving switch to be on or off selectively according to the driving signal.
7. The dimming module of claim 1 , wherein the control voltage is at a first level when the trigger delay angle is at a first angle, and the control voltage is at a second level when the trigger delay angle is at a second angle, wherein the first angle is larger than the second angle, and the first level is smaller than the second level.
8. The dimming module of claim 1 , wherein the voltage converting circuit comprises a switching power supply.
9. The dimming module of claim 1 , wherein the linear driving circuit comprises:
a reference voltage source configured to output a reference voltage;
a processing unit configured to receive the reference voltage and output a voltage command according to the reference voltage;
a first operational amplifier configured to receive the voltage command and a feedback voltage signal to output a driving signal; and
a driving unit configured to drive the lighting module according to the driving signal.
10. The dimming module of claim 9 , wherein the linear driving circuit further comprises:
a second operational amplifier configured to output a control signal according to the control voltage and a reference signal;
wherein the processing unit is further configured to receive the control signal, and output the voltage command according to the control signal, so as to output the driving signal by the first operational amplifier.
11. A lighting device, comprising:
a substrate,
a lighting module comprising a light-emitting diode located on the substrate;
a voltage converting circuit located on the substrate and configured to output a dc operating voltage having an operating level to the lighting module;
a linear driving circuit located on the substrate and configured to drive the lighting module according to a control voltage, so as to adjust a driving current flowing through the lighting module;
a triggering circuit located on the substrate and configured to correspondingly output a first voltage signal according to a dimming command;
a rectifying circuit located on the substrate and configured to rectify the first voltage signal, so as to output a second voltage signal; and
a control signal generating circuit located on the substrate and configured receive the second voltage signal and output the control voltage according to the second voltage signal.
12. The lighting device of claim 11 , wherein the linear driving circuit comprises:
a processing unit located on the substrate and configured to output a driving signal according to the control voltage; and
a driving unit located on the substrate and configured to drive the lighting module according to the driving signal, wherein the processing unit is configured to control the driving unit via the driving signal, so as to adjust the driving current.
13. The lighting device of claim 12 , wherein the driving unit comprises a driving switch, and a first terminal of the driving switch is electrically coupled to the lighting module, a second terminal of the driving switch is electrically coupled to a ground terminal, and a control terminal of the driving switch is configured to receive the driving signal, wherein the processing unit is configured to control the driving switch to be on or off selectively according to the driving signal.
14. The lighting device of claim 11 , wherein the voltage converting circuit is configured to convert the second voltage signal to the dc operating voltage, and when the triggering circuit changes the first voltage signal according to the dimming command, the voltage converting circuit controls the dc operating voltage maintained at the same operating level.
15. The lighting device of claim 11 , wherein the control signal generating circuit comprises:
a first resistor, wherein a first terminal of the first resistor is configured to receive the second voltage signal;
a second resistor, wherein a first terminal of the second resistor is electrically coupled to a second terminal of the first resistor, and a second terminal of the second resistor is electrically coupled to a ground terminal; and
a first capacitor, wherein a first terminal of the first capacitor is electrically coupled to the first terminal of the second resistor, and a second terminal of the first capacitor is electrically coupled to the second terminal of the second resistor.
16. The lighting device of claim 11 , wherein the voltage converting circuit comprises a switching power supply.
17. The lighting device of claim 11 , wherein the linear driving circuit comprises:
a reference voltage source configured to output a reference voltage;
a processing unit configured to receive the reference voltage and output a voltage command according to the reference voltage;
a first operational amplifier configured to receive the voltage command and a feedback voltage signal to output a driving signal; and
a driving unit configured to drive the lighting module according to the driving signal.
18. The lighting device of claim 17 , wherein the linear driving circuit further comprises:
a second operational amplifier configured to output a control signal according to the control voltage and a reference signal;
wherein the processing unit is further configured to receive the control signal, and output the voltage command according to the control signal, so as to output the driving signal by the first operational amplifier.