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Converter with automatic switching over pulse width/frequency modulating mode and its control circuit

An automatic switching and control circuit technology, applied in the field of converters, can solve the problems of lower overall efficiency, achieve high working efficiency and reduce switching loss

Inactive Publication Date: 2008-03-26
NIKO SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a converter with automatic switching pulse width / frequency modulation mode and a PWM / PFM automatic switching control circuit to solve the problem that the switching loss of the prior art does not decrease with the load drop when the load is light. reduce the overall efficiency of the problem

Method used

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  • Converter with automatic switching over pulse width/frequency modulating mode and its control circuit
  • Converter with automatic switching over pulse width/frequency modulating mode and its control circuit
  • Converter with automatic switching over pulse width/frequency modulating mode and its control circuit

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Embodiment Construction

[0053]Please refer to FIG. 1 , which is a schematic block diagram of a converter circuit with automatic switching of pulse width / frequency modulation mode according to the present invention. The present invention utilizes a PWM / PFM automatic switching control circuit 20 to be connected to an activation control unit 102, a PWM control unit 106 and a PFM control unit 108, and the activation control unit 102 transmits an activation enabling (enable) signal to the PWM / PFM automatic Switch the control circuit 20 and control its enabling action. At the same time, after the PWM / PFM automatic switching control circuit 20 is enabled, the PWM control unit 106 and the PFM control unit 108 respectively send a feedback signal to the PWM / PFM automatic switching control circuit 20 , to provide a basis for the PWM / PFM automatic switching control circuit 20 to output a selection signal. The PWM / PFM automatic switching control circuit 20 transmits a selection signal to the PWM control unit 106 ...

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Abstract

The present invention relates to one kind of converter with automatic switched pulse width / frequency modulation mode and connected via one power switch drive unit to load. The converter includes activating control unit to output one activating enable signal; automatic PWM / PFM switching control circuit connected to the activating control unit to receive the activating enable signal and output one selection signal; PWM control unit connected to the automatic PWM / PFM switching control circuit, power switch drive unit and load to control the switching of the power switch drive unit; and PEM control unit connected to the automatic PWM / PFM switching control circuit, power switch drive unit and load to control the switching of the power switch drive unit. The present invention has switching frequency decreased with lowered load and thus lowered switching loss and higher operation efficiency.

Description

technical field [0001] The invention relates to a converter with automatic switching of pulse width / frequency modulation mode, in particular to a converter capable of automatically switching between pulse width modulation (PWM) and pulse frequency modulation (PFM) as the load changes. mode DC-to-DC or AC-to-DC converters. Background technique [0002] Due to the vigorous development of electronic technology, electronic products have been widely used by people. Therefore, the problem of power supply used by electronic products has become a very important issue. At present, electronic products generally use switching power supply mode to realize power supply, and the switching mode can be realized through two working modes of pulse width modulation technology (PWM) or pulse frequency modulation technology (PFM). The toggle work of the switch. [0003] When electronic products work under full load or medium load conditions, the switching action of the switch is usually contro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/28H02M7/48
Inventor 吴俊政
Owner NIKO SEMICON