Control circuit, control method and lighting device compatible with dimmer or switch

1. A control circuit compatible with a dimmer or switch, wherein the dimmer or switch is connectable to a power supply input end of a light emitting module, and the control circuit comprises:

a charging assistance module, used for assisting in the charging of the dimmer or switch, wherein the charging assistance module comprises a first switch and a first resistor, a resistance value of the first resistor is lower than a predetermined resistance value, so that when the first switch is turned on, an overall resistance value of the first resistor and the light emitting module is lower than the predetermined resistance value; and

a charging control module, comprising a constant voltage source and a second switch, wherein the charging control module is used for controlling a voltage of a first control end of the first switch, so that the first switch is turned on when an input voltage of the power supply input end is between 0 and a first predetermined voltage.

2. The control circuit according to claim 1 , wherein the first switch is turned on when the voltage of the first control end is higher than a first turn-on voltage, and the second switch is turned on when the voltage of a second control end of the second switch is lower than a second turn-on voltage,

wherein when the input voltage of the power supply input end is between 0 and the first predetermined voltage, the voltage of the second control end of the second switch is lower than the second turn-on voltage.

3. The control circuit according to claim 2 , wherein the constant voltage source is connected to the first control end of the first switch via the second switch, so that when the second switch is turned on, the voltage of the first control end is higher than the first turn-on voltage, and the first switch is turned on accordingly.

4. The control circuit according to claim 2 , wherein the charging assistance module and the light emitting module are connected in parallel to the power supply input end, so that when the first switch is turned on, the overall resistance value of the first resistor and the light emitting module, which are connected in parallel, is lower than the predetermined resistance value.

5. The control circuit according to claim 2 , wherein the second control end is connected to the power supply input end via a voltage dividing resistor, so that when the input voltage of the power supply input end is lower than the first predetermined voltage, the voltage of the second control end of the second switch is lower than the second turn-on voltage.

6. The control circuit according to claim 1 , further comprising a control unit, wherein the control unit is configured to:

detect a voltage characteristic of the first control end, the second control end of the second switch, or a third control end located between the first switch and the first resistor;

determine, according to the detected voltage characteristic, whether the power supply input end is connected to the dimmer or switch;

when it is determined that the power supply input end is not connected to the dimmer or switch, pull down the voltage of the first control end to be lower than the first turn-on voltage of the first switch; and

when it is determined that the power supply input end is connected to the dimmer or switch, not adjust the voltage of the first control end.

7. The control circuit according to claim 6 , wherein when detecting the voltage characteristic of the first control end, the voltage characteristic is an interval between adjacent voltage pulses of the first control end; when detecting the voltage characteristic of the second control end, the voltage characteristic is a time length when the voltage of the second control end is lower than a predetermined threshold voltage within one cycle; and when detecting the voltage characteristic of the third control end, the voltage characteristic is the interval between adjacent voltage pulses of the third control end.

8. The control circuit according to claim 7 , wherein when it is detected that the interval between the adjacent voltage pulses of the first control end or the third control end is constantly greater than a predetermined time interval, the control unit determines that the power supply input end is connected to the dimmer or switch.

9. The control circuit according to claim 7 , wherein when it is detected that the time length when the voltage of the second control end is lower than the predetermined threshold voltage within one cycle is longer than a predetermined time period, the control unit determines that the power supply input end is connected to the dimmer or switch.

10. A lighting device compatible with a dimmer or switch, wherein the lighting device comprises:

a light emitting module, connected to a power supply input end to emit light; and

a control circuit comprising:

a charging assistance module, used for assisting in the charging of the dimmer or switch, wherein the charging assistance module comprises a first switch and a first resistor, a resistance value of the first resistor is lower than a predetermined resistance value, so that when the first switch is turned on, an overall resistance value of the first resistor and the light emitting module is lower than the predetermined resistance value, and

a charging control module, comprising a constant voltage source and a second switch, wherein the charging control module is used for controlling a voltage of a first control end of the first switch, so that the first switch is turned on when an input voltage of the power supply input end is between 0 and a first predetermined voltage, wherein the control circuit and the light emitting module are connected in parallel to the power supply input end.

11. The lighting device compatible with the dimmer or switch according to claim 10 , wherein the lighting device further comprises a signal control module, and the signal control module is configured to:

receive a voltage regulation signal from the dimmer or switch, when the dimmer or switch is connected to the power supply input end of the light emitting module;

convert the received voltage regulation signal into a driving signal of the light emitting module; and

send the converted driving signal to the light emitting module, so that the light emitting module emits light according to the driving signal, instead of emitting light according to the voltage regulation signal.

12. The lighting device compatible with the dimmer or switch according to claim 11 , wherein the signal control module is an application program that is installed in a mobile device far from the light emitting module.

13. A control method compatible with a dimmer or switch, wherein the dimmer or switch is connected to a power supply input end of a light emitting module, and the control method comprises:

in response to that an input voltage of the power supply input end is between 0 and a first predetermined voltage, turning on a second switch, so that a first switch of a charging assistance module is turned on; and

in response to that the input voltage of the power supply input end is not between 0 and the first predetermined voltage, turning off the second switch, so that the first switch of the charging assistance module is turned off,

wherein the charging assistance module comprises a first switch and a first resistor, a resistance value of the first resistor is lower than a predetermined resistance value, so that when the first switch is turned on, an overall resistance value of the first resistor and the light emitting module is lower than the predetermined resistance value, and

the voltage of a first control end of the first switch is controlled by a constant voltage source and the second switch, so that when the second switch is turned on, the first switch is turned on, and when the second switch is turned off, the first switch is turned off.

14. The control method according to claim 13 , wherein the constant voltage source is connected to the first control end of the first switch via the second switch, so that when the second switch is turned on, the first switch is turned on, and when the second switch is turned off, the first switch is turned off.

15. The control method according to claim 13 , wherein the first switch is turned on when the voltage of the first control end is higher than a first turn-on voltage, the second switch is turned on when the voltage of a second control end of the second switch is lower than a second turn-on voltage, and

turning on the second switch in response to that the input voltage of the power supply input end is between 0 and the first predetermined voltage comprises: in response to that the input voltage of the power supply input end is between 0 and the first predetermined voltage, the voltage of the second control end of the second switch is made lower than the second turn-on voltage.

16. The control method according to claim 15 , wherein the second control end is connected to the power supply input end via a voltage dividing resistor, so that when the input voltage of the power supply input end is lower than the first predetermined voltage, the voltage of the second control end of the second switch is lower than the second turn-on voltage.

17. The control method according to claim 13 , further comprising:

detecting a voltage characteristic of the first control end, the second control end of the second switch, or a third control end located between the first switch and the first resistor;

determining, according to the detected voltage characteristic, whether the power supply input end is connected to the dimmer or switch;

when it is determined that the power supply input end is not connected to the dimmer or switch, pulling down the voltage of the first control end to be lower than the first turn-on voltage of the first switch; and

when it is determined that the power supply input end is connected to the dimmer or switch, not adjusting the voltage of the first control end.

18. The control method according to claim 17 , wherein when detecting the voltage characteristic of the first control end or the third control end, the voltage characteristic is an interval between adjacent voltage pulses of the corresponding control end, and determining, according to the detected voltage characteristic, whether the power supply input end is connected to the dimmer or switch comprises:

when it is detected that the interval between the adjacent voltage pulses of the corresponding control end is constantly greater than a predetermined time interval, determining that the power supply input end is connected to the dimmer or switch, and

when a case that the interval between the adjacent voltage pulses of the corresponding control end is not greater than the predetermined time interval is detected, determining that the power supply input end is not connected to the dimmer or switch.

19. The control method according to claim 17 , wherein when detecting the voltage characteristic of the second control end, the voltage characteristic is a time length when the voltage of the second control end is lower than a predetermined threshold voltage within one cycle, and determining, according to the detected voltage characteristic, whether the power supply input end is connected to the dimmer or switch comprises:

when it is detected that the time length when the voltage of the second control end is lower than the predetermined threshold voltage within one cycle is greater than a predetermined time period, determining that the power supply input end is connected to the dimmer or switch, and

when it is detected that the time length when the voltage of the second control end is lower than the predetermined threshold voltage within one cycle is not greater than the predetermined time period, determining that the power supply input end is not connected to the dimmer or switch.

20. The control method according to claim 13 , further comprising:

receiving a voltage regulation signal from the dimmer or switch, when the dimmer or switch is connected to the power supply input end of the light emitting module;

converting the received voltage regulation signal into a driving signal of the light emitting module; and

sending the converted driving signal to the light emitting module, so that the light emitting module emits light according to the driving signal, instead of emitting light according to the voltage regulation signal.