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LED dimming load sudden change suppression circuit

A technology of dimming circuit and load mutation, applied in the field of LED dimming load mutation suppression circuit, can solve the problems of rising working current, easy damage of LED lamp D1, rising total current of LED dimming circuit, etc. damage effect

Inactive Publication Date: 2019-01-01
SI EN TECH XIAMEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there is a problem in the LED dimming circuit that adopts the series connection method at present. Since each LED light string is connected in series, when the switch circuit of a certain LED light string is closed and the LED light string is turned off, the load voltage of the entire LED dimming circuit will be caused. The instantaneous rise makes the total current of the LED dimming circuit rise, which makes the operating current of other LED light strings increase instantaneously. Excessive operating current will shorten the life of the LED lamp D1 and even cause the LED lamp D1 to be damaged; and because the LED dimming A capacitor is connected in parallel to the input end of the circuit. The characteristics of the capacitor will maintain the previous voltage, so that the load voltage of the LED dimming circuit will not drop rapidly, so that the operating current of other LED light strings will not drop rapidly to the normal value, so that the LED Lamp D1 is more prone to damage

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0028] like figure 1 As shown, in Embodiment 1, the LED dimming load sudden change suppression circuit according to the present invention further includes a voltage amplifier U3 and a voltage amplifier U4, and the voltage amplifier U3 and the voltage amplifier U4 are respectively used to control the sampling resistor R1. The voltage at the terminal and the voltage between the drain and the source of the MOS transistor Q1 are collected.

[0029] Specifically, in this embodiment, the MOS transistor Q1 is a PMOS transistor; the voltage output terminal Vout of the DC-DC module U2 and one end of the capacitor C1, one end of the sampling resistor R1, and the positive phase input end of the voltage amplifier U3 The other end of the capacitor C1 is connected to the ground, the other end of the sampling resistor R1 is connected to the inverting input end of the voltage amplifier U3, the non-inverting input end of the voltage amplifier U4 and the source of the MOS transistor Q1, and th...

Embodiment 2

[0032] like figure 2 As shown, in the second embodiment, the LED dimming load sudden change suppression circuit according to the present invention further includes a voltage amplifier U3 and a voltage amplifier U4, and the voltage amplifier U3 and the voltage amplifier U4 are respectively used to control the sampling resistor R1. The voltage at the terminal and the voltage between the drain and the source of the MOS transistor Q1 are collected.

[0033] Specifically, in this embodiment, the MOS transistor Q1 is a PMOS transistor; the voltage output terminal Vout of the DC-DC module U2 and one end of the capacitor C1, the source of the MOS transistor Q1, and the positive phase input of the voltage amplifier U4 The other end of the capacitor C1 is connected to the ground, the drain of the MOS transistor Q1 is connected to the positive input terminal of the voltage amplifier U3, the inverting input terminal of the voltage amplifier U4 and one end of the sampling resistor R1, and...

Embodiment 3

[0035] like image 3 As shown, in the third embodiment, the LED dimming load sudden change suppression circuit according to the present invention further includes a voltage amplifier U4, and the voltage amplifier U4 is used to control the voltage between the drain and the source of the MOS transistor Q1 to collect.

[0036] Specifically, in this embodiment, the MOS transistor Q1 is a PMOS transistor; the voltage output terminal Vout of the DC-DC module U2 and one end of the capacitor C1, the source of the MOS transistor Q1, and the positive phase input of the voltage amplifier U4 The other end of the capacitor C1 is connected to the ground, the drain of the MOS transistor Q1 is connected to the inverting input terminal of the voltage amplifier U4 and the input terminal of the LED dimming circuit, and the output terminal of the LED dimming circuit is connected to the sampling resistor R1 One end of the error amplifier U1 is connected to the non-inverting input end, and the oth...

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Abstract

The invention discloses an LED dimming load sudden change suppression circuit which is applied to an LED dimming circuit. The LED dimming load sudden change suppression circuit comprises an MOS transistor Q1, a sampling resistor R1 an error amplifier U1 and a DC-DC module U2. The LED dimming load sudden change suppression circuit can ensure that the total current of the LED dimming circuit is constant, thereby avoiding damages of an LED lamp.

Description

technical field [0001] The invention relates to the field of LED lamps, in particular to an LED dimming load mutation suppression circuit. Background technique [0002] In order to solve the negative impact of the difficulty of dimming caused by the parallel connection of multiple LED lamp strings, more and more LED lamp strings are dimming circuits in series, such as Image 6 As shown, the current series-connected LED dimming circuit includes multiple series-connected LED light strings, each light string includes multiple series-connected LED lights D1, each LED light string is connected in parallel with a switch circuit SW, through the switch circuit SW The switching frequency can control the brightness of each LED light string, and this LED dimming circuit is generally driven by the DC-DC module, in order to ensure the stability of the DC-DC module, usually at the output of the DC-DC module Connect a capacitor in parallel, that is, connect a capacitor in parallel at the i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/40H05B45/10
Inventor 李云峰修利平
Owner SI EN TECH XIAMEN
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