A device for reducing jitter of a light source in low brightness by a vibration suppression module, comprising:
- an LED light source, an inductor L, a current control module, a switch K1, a signal control module, a current acquisition module, and the vibration suppression module, wherein the vibration suppression module comprises a vibration suppression resistor R and a vibration suppression capacitor C;
- wherein a first end of the switch K1 is used for inputting a voltage Vin, and a second end of the switch K1 is connected to a first end of the inductor L;
- a second end of the inductor L is connected to an anode of the LED light source, and a cathode of the LED light source is grounded;
- a first end of the current control module is connected to the second end of the switch K1 and the first end of the inductor L, and a second end of the current control module is grounded;
- when the switch K1 is closed, the current control module is cut off, and when the switch K1 is opened, the current control module is conducted;
- the current acquisition module is used for detecting a current flowing through the inductor L when the inductor L is charged, is connected to the signal control module, and sends a current signal to the signal control module according to the detected current;
- the signal control module is further connected to the switch K1 and used for controlling the switch K1 to be opened or closed according to the received current signal or a preset time threshold;
- and
- a first end of the vibration suppression module is connected to the second end of the inductor L and the anode of the LED light source, a second end of the vibration suppression module is connected to the cathode of the LED light source and ground, and the vibration suppression module is used for suppressing current oscillation generated in the device;
- wherein a first end of the vibration suppression capacitor C is connected to the second end of the inductor L and the anode of the LED light source, a second end of the vibration suppression capacitor C is connected to a first end of the vibration suppression resistor R, and a second end of the vibration suppression resistor R is connected to the cathode of the LED light source and the ground;
- wherein the vibration suppression resistor R is:
- R
- =
- (
- f
- 0
- f
- 1
- )
- 2
- -
- 1
- 2
-
- π
-
- f
- 0
-
- C
- 1
- ;
- the vibration suppression capacitor C is:
- C
- =
- 3
-
- C
- 1
- (
- f
- 0
- f
- 1
- )
- 2
- -
- 1
- ;
- wherein, C1 is a known capacitor, f0 is an original oscillation frequency of the current flowing through the LED light source when the vibration suppression module is not set, and f1 is a temporary oscillation frequency of the current flowing through the LED light source after the known capacitor C1 is connected to two ends of the LED light source in parallel when the vibration suppression module is not set.