Constant current dc-dc converter and constant current led drive dc-dc converter with digital pwm control

Abstract

The invention discloses a constant current DC (Direct Current)-DC converter utilizing digital PWM (Pulse-Width Modulation) control and a constant current LED (Light Emitting Diode) drive DC-DC converter. The constant current DC-DC converter utilizing digital PWM control comprises a power level and a digital PWM control level which are electrically connected, as well as a constant current control level electrically connected with the power level and the digital PWM control level respectively. The constant current DC-DC converter utilizing digital PWM control and the constant current LED drive DC-DC converter disclosed by the invention can overcome defects in the prior art, such as complex structure, high cost, large power consumption and low conversion efficiency, so as to realize the advantages of simple structure, low cost, small power consumption, good constant current effect and high conversion efficiency.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a constant-current DC-DC converter controlled by digital PWM and a constant-current LED driving DC-DC converter. Background technique [0002] In the field of integrated circuit technology, digital switching power supply has flexible programmability, different complex functions can be realized through external digital signals, and it can eliminate the advantages of instability and electromagnetic interference caused by discrete components. Therefore, digital switching power supply technology has been developed rapidly. [0003] The digital switching power supply adopts digital pulse width modulation (Pulse Width Modulation, referred to as PWM, also known as pulse width modulation) control technology, the existing DC-DC converter using digital PWM control such as figure 1 shown. exist figure 1 Among them, the DC-DC converter adopting digital PWM control includes a d...

AI Technical Summary

Problems solved by technology

[0006] figure 1 The existing digital PWM control technology shown requires complex control algorithms and circuits, resulting in high chip costs; moreover, high-resolution digital PWM modulation requires a high operating frequency, so more power consumption is required. This reduces the efficiency of the DC-DC converter (also known as a DC chopper, used to convert a fixed DC voltage into a variable DC voltage)

[0007] In the process of realizing the present invention, the inventor found that there are at least defects in the prior art such as complex structure, high cost, large power consumption and low conversion efficiency

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