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Control circuit, driving circuit, control method and lighting device

A technology of a control circuit and a control method, which is applied in the direction of electrical components, etc., can solve the problems of affecting the lighting effect of the lighting device, the LED being dimmed, and unable to be lit.

Pending Publication Date: 2021-11-02
SHANGHAI LOOALL ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] But when the pulsating DC voltage VREC decreases, such as Figure 4 As shown, when the pulsating DC voltage VREC drops below the conduction voltage drop VLED of the LED, the LED will be dimmed or even unable to be lit, or the current of the LED will increase periodically (corresponding to the power frequency 50 / 60HZ) and decrease, resulting in low-frequency strobe, and the strobe depth decreases with the decrease of the mains voltage. Generally, when the mains voltage drops by 10%, the stroboscopic depth exceeds 10%, which affects the luminous effect of the lighting device

Method used

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  • Control circuit, driving circuit, control method and lighting device
  • Control circuit, driving circuit, control method and lighting device
  • Control circuit, driving circuit, control method and lighting device

Examples

Experimental program
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Embodiment 1

[0756] This embodiment provides a control circuit and a drive circuit, such as Figure 5 As shown, the control circuit 1 is used to control the electrical circuit composed of a DC power supply U and n LED groups LED1...LEDn connected in series. The control circuit 1 includes a control unit D1 and m sub-switching units Q1...Qm; where n is greater than or is an integer equal to 2, and m is an integer greater than or equal to 1 and less than or equal to n. The drive circuit 2 includes a control circuit 1, a DC power supply U, and n LED groups LED1...LEDn.

[0757] The LED groups LED1...LEDn are LED combinations formed by one or more LEDs connected in series or in parallel; the sub-switch units Q1...Qm respectively correspond to an LED group. When the sub-switch unit is turned on, the corresponding LED group is bypassed, and the sub-switch When the unit is off, the corresponding LED group is turned on, so that the corresponding LED group is lit or extinguished, Figure 5 Among t...

Embodiment 2

[0765] This embodiment is further optimized on the basis of Embodiment 1, and provides a control circuit and a drive circuit. In addition to the control unit D1 and m sub-switching units Q1...Qm, the control circuit 1 also includes a current limiting device Q0 , the current limiting device Q0 is connected in series to the electrical circuit formed by the DC power supply U and the series connection of n LED groups LED1...LEDn; wherein n is an integer greater than or equal to 2, and m is an integer greater than or equal to 1 and less than or equal to n. The drive circuit 2 includes a control circuit 1, a DC power supply U, and n LED groups LED1...LEDn.

[0766] Wherein, the current limiting device Q0 can be a resistor, or a field effect transistor and / or a triode, and can be arranged at a required position in the control circuit 1 and the drive circuit 2 . When the current limiting device Q0 is a field effect transistor and / or triode, the specific circuit structure is as follows...

Embodiment 3

[0808] This embodiment is basically the same as Embodiment 2, except that the current limiting device Q0 and at least one LED group adjacent to the current limiting device Q0 form at least one series connection branch, and the m sub-switching units Q1...Qm x are respectively connected in parallel at both ends of the series branch, and the remaining m-x sub-switching units are respectively connected in parallel at both ends of the corresponding LED group, such as Figure 10 As shown, x is an integer, and x is greater than or equal to 1 and less than or equal to m.

[0809] At this time, when the output voltage of the DC power supply U is greater than or equal to the sum of the conduction voltage drops of all LED groups, all sub-switch units are cut off, and the control unit D1 sets the main circuit by controlling the conduction impedance of the current limiting device Q0 current. When the output voltage of the DC power supply U is less than the sum of the conduction voltage dr...

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Abstract

The invention discloses a control circuit, a driving circuit, a control method and a lighting device. The control circuit is used for controlling an electrical loop formed by connecting a direct current power supply and n LED groups in series, and the control circuit comprises a control unit and m branch switch units, wherein each branch switch unit corresponds to one of the LED groups; the control unit is used for respectively controlling the on or off of the branch switch units; when the output voltage of the direct-current power supply is not less than the sum of conduction voltage drops of the n LED groups, the control unit cuts off the m branch switch units to form a main loop; and when the output voltage is smaller than the sum of the conduction voltage drops of the n LED groups, the control unit conducts at least one branch switch unit and cuts off the remaining branch switch units to form branch loops. Under the condition that the output voltage of the direct-current power supply is reduced, the switching-on or switching-off of the branch switch unit is controlled, so that the LED can still be lightened under the condition that the output voltage is reduced.

Description

[0001] This application claims the priority of the Chinese patent application CN201910493482.1 with the filing date of June 6, 2019. [0002] This application claims the priority of the Chinese patent application CN201911106847.7 with the filing date of November 13, 2019. [0003] This application claims the priority of the Chinese patent application CN201911106813.8 with the filing date of November 13, 2019. [0004] This application claims the priority of the Chinese patent application CN201911106939.5 with the filing date of November 13, 2019. [0005] This application claims the priority of the Chinese patent application CN201911106790.0 with the filing date of November 13, 2019. [0006] This application claims the priority of the Chinese patent application CN201911107801.7 with the filing date of November 13, 2019. [0007] This application claims the priority of the Chinese patent application CN202010340456.8 with the filing date of April 27, 2020. [0008] This applic...

Claims

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Application Information

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IPC IPC(8): H05B45/30H05B45/10
CPCH05B45/30H05B45/10
Inventor 邵蕴奇徐勇
Owner SHANGHAI LOOALL ELECTRONICS CO LTD