# US 11,910,505 B2 · Device for reducing jitter of light source in low brightness by vibration suppression module and light fixture

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- Number: US 11,910,505 B2
- Document ID: US11910505B2
- Status: Granted
- Kind: B2
- Application number: 17/588,899
- Filed: 2022-01-31
- Published: 2023-06-08
- Granted: 2024-02-20
- Earliest claimed: 2021-11-01
- Assignees: Guangzhou Haoyang Electronic Co., Ltd.
- Applicants: Guangzhou Haoyang Electronic Co., Ltd.
- Inventors: Weikai Jiang
- Web page: https://patentgrep.com/patent/US11910505B2

## CPC

- H05B 45/59: for reducing or suppressing flicker or glow effects
- H05B 45/14: using electrical feedback from LEDs or from LED modules
- H05B 45/3725: Switched mode power supply [SMPS]
- Y02B 20/30: Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
- Y02B 20/40: Control techniques providing energy savings, e.g. smart controller or presence detection
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

A device for reducing jitter of light source in low brightness by a vibration suppression module includes 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. The present invention can eliminate a current ripple in a rising process of a current in the LED light source, as well as suppressing current oscillations generated when the current changes suddenly, the current on the LED light source thus can rise steadily, the LED light source can be steadily brightened in a brightness adjusting process of a dark part, and a phenomenon of light flicker and jitter caused by the current oscillation and the current ripple is avoided.

## Claims

### Claim 1

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 resistor R is directly connected to the second end of the inductor L and the anode of the LED light source, a second end of the vibration suppression resistor R is connected to a first end of the vibration suppression capacitor C, and a second end of the vibration suppression capacitor C is connected to the cathode of the LED light source and the ground;
wherein the vibration suppression resistor R is:
the vibration suppression capacitor C is:
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.

### Claim 2

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.

### Claim 3 (depends on 1)

The device according to claim 1, wherein
the temporary oscillation frequency f1 of the current of the LED light source after the known capacitor C1 is connected in parallel is greater than or equal to half of the original oscillation frequency f0.

### Claim 4 (depends on 1)

The device according to claim 1, wherein
the current acquisition module presets a current threshold, and when the current detected by the current acquisition module reaches the current threshold, the current signal is sent to the signal control module, so that the signal control module controls the switch K1 to be opened, and
the signal control module presets a time threshold, and controls the switch K1 to be closed when it is detected that opening time of the switch K1 exceeds the time threshold.

### Claim 5 (depends on 1)

The device according to claim 1, wherein
a first end of the current acquisition module inputs the voltage Vin, and a second end of the current acquisition module is connected to the first end of the switch K1.

### Claim 6 (depends on 1)

The device according to claim 1, wherein
the first end of the current acquisition module is connected to the second end of the switch K1, and the second end of the current acquisition module is connected to the first end of the current control module and the first end of the inductor L.

### Claim 7 (depends on 1)

The device according to claim 1, wherein
the first end of the current acquisition module is connected to the second end of the inductor L, and the second end of the current acquisition module is connected to the anode of the LED light source and the first end of the vibration suppression module.

### Claim 8 (depends on 1)

The device according to claim 1, wherein the current control module is a diode D1, a cathode of the diode D1 is connected to the first end of the inductor L and the second end of the switch K1, and an anode of the diode D1 is grounded.

### Claim 9 (depends on 1)

The device according to claim 1, wherein the current control module is a switch K2, a first end of the switch K2 is connected to the first end of the inductor L and the second end of the switch K1, a second end of the switch K2 is grounded, when the switch K1 is closed, the switch K2 is opened, and when the switch K1 is opened, the switch K2 is closed.

### Claim 10 (depends on 9)

The device according to claim 9, wherein the switch K2 is connected to the signal control module, so that the signal control module controls the switch K2 to be closed or opened.

### Claim 11 (depends on 1)

A light fixture, comprising at least one device for reducing jitter of light source in low brightness by the vibration suppression module according to claim 1.