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Switching converters for driving LEDs or for supplying additional LED converter stages

A technology of switching converters and converters, which is applied in the direction of output power conversion devices, conversion of DC power input to DC power output, use of semiconductor lamps, etc., and can solve problems such as large noise

Active Publication Date: 2020-03-06
TRIDONIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, in some applications the control unit may be geographically separated from the switching converter and especially the shunt resistor such that modifying the resistance value of the shunt resistor would result in long wires / traces which would introduce a lot of noise

Method used

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  • Switching converters for driving LEDs or for supplying additional LED converter stages
  • Switching converters for driving LEDs or for supplying additional LED converter stages
  • Switching converters for driving LEDs or for supplying additional LED converter stages

Examples

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Embodiment Construction

[0041] It should be noted that Figure 1 to Figure 7 The switching converter 1 shown is a simplified diagram, so that parts of the converter that are irrelevant or unnecessary to the present invention are not shown. For example, the converter can be connected to the voltage bus V bus Or it can be connected to a rectifier (not shown in detail).

[0042] figure 1 A diagram showing a switching converter 1 for driving LEDs or for supplying another LED converter stage, in which, figure 1 The converter shown is a flyback converter and therefore a potential isolation switching converter.

[0043] figure 1 The converter 1 in includes a transformer 6 having a primary side and a secondary side, wherein, for example, an LED 16 is provided on the secondary side. On the primary side of the transformer 6, the converter 1 further includes a switch 2, a sensing path with a shunt resistor 4, a feedback path with a voltage scaling unit 5 and a control unit 3.

[0044] From figure 1 It can be seen th...

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Abstract

A switching converter for driving an LED or for supplying another LED converter stage comprising: a switch; a control unit; a sensing path for sensing a voltage drop at a shunt resistor; and a feedback path for feeding The control unit feeds back a voltage signal representing the voltage drop at the shunt resistor (4) of the sensing path, the control unit (3) uses the voltage signal to control the timing of the switches, the switching converter (1) also includes a voltage scaling unit for use in accordance with at least two different scaling factors to scale the voltage signal, alternatively, the switching converter further comprises: different power supply connection terminals for connecting with corresponding phases of at least two phases of the power supply voltage; and a voltage scaling unit for Scaling the voltage signal by at least two different scaling factors to which power connection terminal the phase is connected to; or a voltage scaling unit for scaling the shunt resistor unit by at least two different scaling factors depending on which power connection terminal the phase is connected to the pressure drop at.

Description

Technical field [0001] The present invention relates to a switching converter for driving LEDs or for supplying another LED converter stage, wherein the switching converter includes: a switch; a control unit for controlling the switch; and a shunt resistor The sensing path of the sensor, which is used to sense the voltage drop at the shunt resistor, the voltage drop represents the current flowing through the switch in the closed state of the switch; and the feedback path, which is used to feed back to the control unit representing the sensing path The voltage signal of the voltage drop at the shunt resistor, wherein the control unit is configured to use the voltage signal fed back on the feedback path to control the timing of the switch (clocking). Background technique [0002] Switching converters used to drive LEDs or to supply additional LED converter stages are known, for example, as galvanically isolated switching converters (eg, flyback converters). [0003] Among other thin...

Claims

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Application Information

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IPC IPC(8): H05B45/30H05B44/00
CPCH02M3/33507H05B45/382Y02B20/30Y02B70/10H05B45/3725H02M1/0025
Inventor 林耀烽
Owner TRIDONIC
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