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LED drive circuit

A technology for LED lighting and conversion circuits, which is applied in the layout of electric lamp circuits, electric light sources, electrical components, etc., can solve the problems of expensive conversion ICs, and achieve the effect of eliminating optocouplers

Inactive Publication Date: 2012-10-17
MOSWAY SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Conversion ICs that support PSR are relatively expensive

Method used

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Embodiment Construction

[0057] For LED light bulb applications, driving the LEDs on the secondary side at constant current is very close to driving them at constant power (P LED =I LED ×V LED). For a switching power converter, the amount of power delivered to the secondary side is ideally 0.5L p I p 2 f, where L p is the inductance of the transformer primary at the drain of the power switching device, I p is the peak current at the transformer primary before turning off the power switching device, and f is the switching frequency. Neglecting various losses of individual components and variations in inductance and switching frequency, by taking I p Setting it at the desired value can control the LED drive current. image 3 and Figure 4 Two different typical circuits with constant power mode are shown.

[0058] exist image 3 , there is neither optocoupler feedback nor primary detection circuitry. The peak primary current I is set by resistor R4 p , resistor R4 will peak current I p is c...

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PUM

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Abstract

The invention relates to an LED drive circuit, especially to a switch type power conversion circuit used for an LED illumination component. The provided LED drive circuit comprises: a duty ratio control circuit; a power switch device; and an oscillating circuit, which is used for providing a time reference so as to obtain switch reference frequency for the power switch device. A transformer has a primary winding and two secondary windings; one of the two secondary windings is used for providing power for an LED illumination component and the other secondary winding is used for providing power for the duty ratio control circuit. In one embodiment, one or more resistors controls / control peak currents flowing through the power switch device, so that currents flowing through the LED illumination component can be arranged.

Description

technical field [0001] The invention relates to an LED driving circuit. More particularly but not exclusively, the present invention relates to a switching power supply and associated circuitry for LED lighting. Background technique [0002] Typical LED lighting operating on AC mains usually has a switching converter circuit with LEDs on the secondary side to provide isolation, while driving the LEDs with a constant current source. [0003] figure 1 This typical prior art LED lighting application circuit is shown. exist figure 1 In , AC_L and AC_N represent the live (live) point and neutral point of the AC mains. Diodes D1-D4 form a bridge rectifier that converts the AC mains to high voltage DC, which is filtered by capacitor C1. R1 is a start-up resistor for the duty ratio control circuit U1, which generates a gate signal to drive the power switching device Q1. U1 can be implemented with discrete components or as a separate integrated circuit (IC). Alternatively, U1 ...

Claims

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Application Information

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IPC IPC(8): H05B37/02H02M3/338
CPCY02B20/42Y02B20/40
Inventor 谢潮声陈安邦李植荫邓志强黄艺华
Owner MOSWAY SEMICON
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