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Control circuit, driving circuit, control method and lighting device

A technology for controlling circuits and driving methods, which is applied in the direction of electrical components, etc., and can solve problems such as affecting the luminous effect of lighting devices, LED dimming, and not being able to be lit.

Pending Publication Date: 2021-05-14
SHANGHAI LOOALL ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] 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 depth of strobe 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
Comparison scheme
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Embodiment 1

[0976] This embodiment provides a control circuit and a driving circuit, such as Figure 5 As shown, the control circuit 1 is used to control the electrical circuit formed by the series connection of the DC power supply U and n LED groups LED1...LEDn. The control circuit 1 includes a control unit D1 and m sub-switching units (in other embodiments or also It is called: sub-switch unit) Q1...Qm; wherein n is an integer greater than or equal to 2, m is an integer greater than or equal to 1 and less than or equal to n. The driving circuit 2 includes a control circuit 1, a DC power supply U, and n LED groups LED1 . . . LEDn.

[0977] The LED groups LED1...LEDn are LED combinations formed by one or more LEDs in series or in parallel; the sub-switch units Q1...Qm correspond to one LED group respectively. When the sub-switch unit is turned on, the corresponding LED group is bypassed, and the sub-switch When the unit is turned off, the corresponding LED group is turned on, so that the...

Embodiment 2

[0985]This embodiment is further optimized on the basis of Embodiment 1, and provides a control circuit and a driving circuit. In addition to the control unit D1 and m sub-switch units Q1...Qm, the control circuit 1 also includes a current limiting device Q0 , the current limiting device Q0 is connected in series with the electrical circuit formed by the DC power supply U and n LED groups LED1...LEDn; where 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 driving circuit 2 includes a control circuit 1, a DC power supply U, and n LED groups LED1...LEDn.

[0986] Wherein, the current limiting device Q0 may be a resistor, or a field effect transistor and / or a triode, which may be arranged at the required positions in the control circuit 1 and the driving circuit 2 . When the current limiting device Q0 is a field effect transistor and / or a triode, the specific circuit structure is as follows Image 6 shown...

Embodiment 3

[1028] This embodiment is basically the same as the second embodiment, the difference lies in that the current limiting device Q0, at least one LED group (for example, two LED groups LEDn, two LED groups LEDn, two LED groups LEDn, two LED groups LEDn, two LED groups LEDn, two LED groups LEDn, two LED groups LEDn, two LED groups LEDn, two LED groups LEDn, two LED groups LEDn, two LED groups LEDn, two LED groups LEDn, two LED groups LEDn, two LED groups LEDn, two LED groups LEDn, two LED groups LEDn, two LED groups LEDn, two LED groups LEDn, two LED groups, LEDs LEDn-1) constitutes at least one series unit / series body, m-x of m sub-switching units Q1...Qm (for example, sub-switching units Qm, Q2, etc.) are connected in parallel at both ends of at least one series unit respectively, and the remaining x are divided into The switch units are connected in parallel at both ends of the corresponding LED groups, such as Figure 10 As shown, x is an integer, and x is greater than or equa...

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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; the branch switch units respectively correspond to one LED group; 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. 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 Chinese patent application CN201911106847.7 with an application date of November 13, 2019. [0002] This application claims the priority of Chinese patent application CN201911106813.8 with an application date of November 13, 2019. [0003] This application claims the priority of Chinese patent application CN201911106939.5 with an application date of November 13, 2019. [0004] This application claims the priority of Chinese patent application CN201911106790.0 with an application date of November 13, 2019. [0005] This application claims the priority of Chinese patent application CN201911107801.7 with an application date of November 13, 2019. [0006] This application claims the priority of Chinese patent application CN202010340456.8 with an application date of April 26, 2020. [0007] This application claims the priority of Chinese patent application CN202010508921.4 with an application date of June 6, 2020. [0008] This applic...

Claims

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Application Information

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IPC IPC(8): H05B45/10H05B45/325
CPCH05B45/10H05B45/325
Inventor 邵蕴奇
Owner SHANGHAI LOOALL ELECTRONICS CO LTD